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DIY & Tutorials => DIY Tutorials => Topic started by: mygoggie on October 18, 2019, 03:32:28 PM

Title: Water purification system for household
Post by: mygoggie on October 18, 2019, 03:32:28 PM
I have been very quiet on my Quad 33 (https://www.avforums.co.za/index.php/topic,76696.0.html) and Quad 303 (https://www.avforums.co.za/index.php/topic,76695.0.html) restoration threads mainly because I have been spending most of my spare time designing and installing a household sized water purification system.

The design incorporates the following components:

If anyone is interested I can keep posting as I proceed.

Here is the skid frame and cabinets assembled. Now busy with the internal pumps and piping. Then to tackle the electrical and control design.

(https://i.postimg.cc/L83RGNxz/IMG-20191015-151129.jpg)

(https://i.postimg.cc/ZY733LZK/IMG-20191018-152203.jpg)




Revision 10 of the greywater wetland is almost complete.

(https://i.postimg.cc/Y0ZhPbq6/IMG-20191018-152133.jpg)



The purified greywater is pumped from here into the garden using various pipe circuits.

(https://i.postimg.cc/XJNGBrzC/IMG-20191018-152119.jpg)



The slow sand filter being built. It was a experimental tank that was gifted to me to convert.

(https://i.postimg.cc/TP6WG7jQ/IMG-20191018-152141.jpg)
Title: Re: Water purification system for household
Post by: HB on October 18, 2019, 04:13:35 PM
Great thread Herman. Please continue.

Questions will follow.  :popcorn:
Title: Re: Water purification system for household
Post by: peterc on October 18, 2019, 07:32:58 PM
Very interesting!

Thanks
Title: Re: Water purification system for household
Post by: mygoggie on October 19, 2019, 08:35:56 PM
Today was spent rerouting my UPS system to watch the RWC while EKSDOM did its bit to alleviate our energy levels. In between this I spent some time to make the pump mounting plate.

This is basically a 200 mm x 60 mm extruded fibreglass channel onto which the pumps will be mounted. The idea is to provide a base that can be mounted onto the skid as a separate unit. I will be using rubber mountings to fix the mounting plate to the skid's base. Hopefully this will get rid of some vibrations and noise.

Here I have sawn the piece of channel to length and cut out the little corners to allow fitment in between the base frame members.

(https://i.postimg.cc/kGFHCzNQ/IMG-20191019-084916.jpg)



The hole locations laid out. I worked back from the required pump centrelines.  Yes, I had to work outside in the sunlight due to some strange absence of light of my workshop.

(https://i.postimg.cc/1tFTCffY/IMG-20191019-114323.jpg)



The first fitment with pumps mounted. I spent some more time later in the afternoon to determine the plate's final position and mark out the mounting holes in the skid and in the plate. Will take some pics when this is drilled and the plate finally located.

(https://i.postimg.cc/s2qq4pDh/IMG-20191019-134159.jpg)
Title: Re: Water purification system for household
Post by: Family_Dog on October 19, 2019, 10:05:20 PM
Following with great interest, looks very neat so far Herman.  :thumbs:


-F_D
Title: Re: Water purification system for household
Post by: vleisman on October 20, 2019, 09:11:34 AM
What a great thread, subscribed.
Title: Re: Water purification system for household
Post by: mygoggie on October 20, 2019, 09:27:56 PM
I have been thinking about the switchgear equipment to use in the skid and for this reason asked some questions on another forum where I always get solid answers.

So basically after a lot of back and forth the electrical and electronic design will entail the following:

Electrical:

Electronics:

I will be using two Raspberry PIs to control things.

Voltages I am aiming for will be 24V for controlling and 230VAC for the pumps and the ozonator. I would like to stick to these two to keep things simple and to a standard.

For now I would like to see version 1 of the skid up and running which will allow me to change and improve on the design as data is gathered. No system is ever perfect and the best route is just to get it working and then refine the design until you get to a durable and lasting system. Just my design philosophy.
Title: Re: Water purification system for household
Post by: mygoggie on October 21, 2019, 11:47:56 PM
I did a layout of the pipework required in the skid and then revised it and revised it and again revised it. I can do the design in CAD, but I love free hand sketching as using a pencil on paper is more "warm" for me than a mouse and screen.

So the final layout look something like this.

(https://i.postimg.cc/xCS4jFM1/OTS-skid-pipe-layout-10-Oct-page-1-1.png)



(https://i.postimg.cc/26FX1F7F/OTS-skid-pipe-layout-10-Oct-3.png)



The final step was to mark out the area on the floor and did a draft layout to 5 mm accuracy of the pumps, physical pipes and fittings.

(https://i.postimg.cc/wTb4RBLP/IMG-20191010-204250.jpg)


(https://i.postimg.cc/RZ6s7zT0/IMG-20191010-204307.jpg)


Doing such a draft layout is invaluable as it allows me to look at things from other angles and allow improvements before construction. For example I could change the pump intake layout to streamline it a lot more to ensure smooth flow in the approach to the pump. You will be surprised at how quickly any water turbulence in the pump intake line will increase pump impeller cavitation, shortening the life thereof very quickly.

Just for interest, the golden two rules for pump intake piping design is that the size of the pipe must be 1,25 to 1,5 times the pump intake port diameter and secondly then the approach pipe must be straight for a minimum length of 10 times the chosen diameter.

In this case then the pump intake port is 32mm diameter and I used a 1,25 ratio because the flow volume is low and the suction height is very low. If the suction height approaches 7m then you need to increase the pipe diameter to at least 2 to 2,5 x pump port diameter to prevent boiling of the water under the negative pressure. In this design I could get away with a 40mm diameter pipe. This then requires a final approach length of 400mm.

The following is NOT correct and will destroy the pump impeller within a very short while.

(https://i.postimg.cc/JhgBj9PR/IMG-20191010-100006.jpg)

Title: Re: Water purification system for household
Post by: mygoggie on October 26, 2019, 05:34:36 PM
The past few days were spent stealing time here and there to refine design of the pipework in the skid and comparing it to what is practically possible.

I first completed the through hole layouts and drilled the holes for the piping. Yes, the wind blew for a few days at 40+ knots so leaves are part of our life and I need to clean in any case after cutting the holes. Here are the holes for the service pipes.

(https://i.postimg.cc/pXFnPvWF/IMG-20191024-160934.jpg)



The holes at a closer range.

(https://i.postimg.cc/T2SD816x/IMG-20191024-160927.jpg)



The holes leading to the front valve cabinet for easy operation by the users.

(https://i.postimg.cc/6qD2Cj0q/IMG-20191024-160930.jpg)



Yesterday I completed the installation of the external pipe clips and the entry pipe work.

(https://i.postimg.cc/xdTvfZFV/IMG-20191026-151944.jpg)



Then onto the internal pipe clips. Here the holes are drilled, the rivnuts installed and the first pipe clip screwed down.

(https://i.postimg.cc/4x1vTGP1/IMG-20191026-145709.jpg)


The pipework leading to the valve manifold are installed and clipped in place.

(https://i.postimg.cc/bwP0MrxJ/IMG-20191026-151928.jpg)



The pipe manifold which allows the user to flush the wetland and cross feed the tanks. The manifold also serves as an air trap for any air released during suction when pumping water from the feeding tanks to the slow sand filter. I first had a separate air release circuit, but this morning when I was designing the finer details of the manifold I realised I could do away with it as I have changed the inlet layout to the pumps. So now there are just the two valves with air releasing via the wetland scour circuit. I must say the manifold took some time to design as I had to work to 1mm accuracy to ensure the valve spindles line up perfectly with the holes of the to be installed valve cabinet.

All done and I tested the scouring this afternoon under gravity. Works great and all air from the feed lines are captured and released to atmosphere as planned.

(https://i.postimg.cc/J4ZcPZBv/IMG-20191026-162952.jpg)



The new look of the skid. Next step will be to mount the pumps and complete the pipework leading to and from the pumps.

(https://i.postimg.cc/HWf9wBjb/IMG-20191026-163142.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on October 30, 2019, 03:21:33 PM
It has been a bit back and forth to find the correct anti-vibration mounts for the pump mounting plate. The main issue was to find something that will fit below the channel section, be able to resist corrosion class 3 and still be not too stiff to absorb the cyclic rotation based vibrations of the pumps.

I finally settled on this mount which is specifically designed for the above type of application.

(https://i.postimg.cc/qBLfMLsx/PD-Range-page-1-1.png)


Will order tomorrow and hopefully it will arrive early next week.
Title: Re: Water purification system for household
Post by: chrisc on October 30, 2019, 04:35:00 PM
Those PD mounts could double as speaker supports too...!
Title: Re: Water purification system for household
Post by: mygoggie on November 01, 2019, 10:08:13 AM
Victor of www.microsolve.co.za was so kind as to provide me with a Franklin Electric motor control unit to test in my design. It has arrived at my local PostNet and I need to go and fetch it. Thanks Victor!

It should allow me to provide a robust user friendly system that even SWAMBO will be able to understand. Here is what the manual state about the various protections offered by the unit.

(https://i.postimg.cc/ncR7FnyH/Screenshot-2019-11-01-at-10-05-30.png)
Title: Re: Water purification system for household
Post by: mygoggie on November 03, 2019, 03:56:36 PM
The weekend was a resting one mainly due to the RWC and the rest of the weekend spent recovering from the celebrations ...

This afternoon I spent installing the manifold pipe clips, drilling all the holes in the valve cabinet and doing the first assembly. Golden rule .. measure twice and then again and THEN trust your measurements, not what you perceive to be correct. Anyway, the valve spindle holes came out not in position as measured, but I could fix the situation by enlarging the holes one size up.

The valve clips in position. The rivnuts did not work. I replaced them with long hex nuts I had in stock.

(https://i.postimg.cc/yx8kSFWf/IMG-20191103-115818.jpg)



Valve cabinet fitted with valve handles installed.

(https://i.postimg.cc/Px4Cx6fp/IMG-20191103-153143.jpg)



The valve cabinet secured by four cap screws on the sides. This will allow future removal of the cabinet if the valves needs to be serviced.

(https://i.postimg.cc/VsKSPHH2/IMG-20191103-153206.jpg)



The final look of the skid with valves. Next step will be to install a third pipe clip on the top of the manifold as there is a little bit of movement of the manifold I am not happy with.

(https://i.postimg.cc/Hnvj0VyT/IMG-20191103-153153.jpg)
Title: Re: Water purification system for household
Post by: d0dja on November 03, 2019, 05:21:02 PM
I was following this thread to perhaps do something similar. But now that I've seen how one should do it properly, I may just chicken out. Fantastic work.
Title: Re: Water purification system for household
Post by: mygoggie on November 03, 2019, 08:21:43 PM
I was following this thread to perhaps do something similar. But now that I've seen how one should do it properly, I may just chicken out. Fantastic work.

Thanks @d0dja, feel welcome to ask if you need help to build your own. I have had a number of people express interest in getting such a skid in place. I think I must consider the option that this could become new venture. Let's first get this one working as envisaged and then I can explore such visions.
Title: Re: Water purification system for household
Post by: mygoggie on November 04, 2019, 10:19:06 AM
The anti-vibration mounts arrived this morning. Now I need to turn (or find) spacers to take up the distance between the top of the mount and the underside of the channel mounting plate. I have a few ideas such of source materials to look at. I think I will stick to nylon, rubber or polyurethane. More later ...

(https://i.postimg.cc/3Rbk4S5N/IMG-20191104-101210.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 05, 2019, 02:13:12 PM
Is there someone that can give me some direction as to what is quality in terms of stickers to be made for identifying the pipes flows, control valve functions, pump IDs and in addition the electrical control panel's legally required labels? I really do not want to have something made that shrinks, fade or delaminate. I know nothing about labels, so solid advice will be appreciated.

Title: Re: Water purification system for household
Post by: mygoggie on November 06, 2019, 09:35:29 PM
I received the pump controller unit which Victor was so kind to send to me. Now I can test it and if it works as intended, I can complete the controller board design and finally get to assembling it.

(https://i.postimg.cc/ZqmtrN6S/IMG-20191106-212816.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 06, 2019, 09:43:01 PM
The anti-vibration mounts arrived this morning. Now I need to turn (or find) spacers to take up the distance between the top of the mount and the underside of the channel mounting plate. I have a few ideas such of source materials to look at. I think I will stick to nylon, rubber or polyurethane. More later ...

I bought four flexible PVC door stops today and they are a perfect fit. I drilled the hole a bit larger and presto ...

(https://i.postimg.cc/jdVbsBC2/IMG-20191106-214003.jpg)



Obviously the proof will be in eating the pudding, so I will install this sometime in the remainder of this week and see how the load is handled.
Title: Re: Water purification system for household
Post by: mygoggie on November 09, 2019, 09:28:36 PM
I spent the day completing the external fibreglass work on the slow sand filter. This was one of those jobs where I spent 10 hours working and when you stand back you cannot believe that is all you have done.

Tomorrow I will paint the new fibreglass work and then I can move the filter into its final location. Once upright and correctly positioned I can start installing the external strengthening ribs to support the polycarb window and the new inside dividing panels.

(https://i.postimg.cc/43P9r4qc/IMG-20191109-180538.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 11, 2019, 04:26:58 PM
All painted and ready for the move.

(https://i.postimg.cc/KYgRDtS0/IMG-20191111-160811.jpg)



The pad ready for the filter tank.

(https://i.postimg.cc/0y4zSc36/IMG-20191111-160828.jpg)
Title: Re: Water purification system for household
Post by: Vince MacMahon on November 11, 2019, 04:47:55 PM
Coming along nice - its definitely not a job not for sissies!

Title: Re: Water purification system for household
Post by: mygoggie on November 11, 2019, 09:07:32 PM
As you say @Vince MacMahon it does take a lot of planning and a strong will not to rush things. I do however enjoy the project and I really hope others can learn something from my efforts.

My two mates arrived each with a beer in hand and after about 20 minutes the filter was in place. It was a bit of heavy lifting, but they really are very practical no nonsense guys of few words but with a lot of backbone.

(https://i.postimg.cc/CLhzdmSg/IMG-20191111-184852.jpg)



With the purification skid, greywater wetland and slow sand filter all in final locations.

(https://i.postimg.cc/Hs6jMXk7/IMG-20191111-184910.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 11, 2019, 09:28:21 PM
I had a question as to why I am doing this project. In short the following was my answer. You can also revert to my very first post for more detail (https://www.avforums.co.za/index.php/topic,82803.msg953065.html#msg953065).

I am designing a closed loop water system for a household. In other words, all the water that is collected on the erf from rainwater, well point and condensation harvesting is stored in various tanks, then purified using a slow sand filter and finally supplied to the household at pressure and meeting WHO potable water standards.

Then after the water is used in the house, the greywater is collected, purified and used for irrigation purposes. The blackwater will be collected in a biogas reactor where it will turn into fertiliser for the garden and gas to cook with.

Just my way of giving back some knowledge and skills and hope that someone will learn something and see that even a household can use nature to optimise water usage.
Title: Re: Water purification system for household
Post by: AdrianPowrie on November 11, 2019, 09:39:38 PM
Hi Herman

Really loving this thread and all you have shared so far.

Just a small question if you don't mind?

What is the total SQ meterage of real estate you have allocated for this project?
Excluding all the meters of pipe needed for the collection of grey water etc.

Kind regards
Adrian Powrie
Title: Re: Water purification system for household
Post by: mygoggie on November 11, 2019, 10:37:59 PM
Hi Herman

Really loving this thread and all you have shared so far.

Just a small question if you don't mind?

What is the total SQ meterage of real estate you have allocated for this project?
Excluding all the meters of pipe needed for the collection of grey water etc.

Kind regards
Adrian Powrie

@AdrianPowrie I do not mind answering at all.

When I set out doing this project it was actually 25 years ago when I designed my house with the very kind assistance of my friend who is an architect. At that time recycling and going green was unheard of and I had to convince him to steer away from his normal in designing the house layout. Two very important things I insisted on and that was that the house's plumbing all had to exit the house in one location and secondly that all roofs should face NE, N and NW for optimum solar collection.

So the house was designed and built with those two criteria from me. SWAMBO's list obviously was a LOT longer and he managed to incorporate that as well. He actually designed the house around her baby grand piano and not my green requirements!

When I designed the reservoir locations I was severely limited in my real estate space and I realised that most people will find themselves in the same position. I presume you are onboard here as you asked the question. So I set out to install a large 15kl tank underground with a room to be constructed on top of it to save space. The other two 5kl tanks I could fit into the "empty" space along the erf boundary. The rest of the equipment to all to fit in between the two tank locations.

At this moment the wetland + settling tanks and pump, slow sand filter, water purification skid, the two 5kl tanks, the well point and the future underground biogas reactor will all in the end fit into an area of 10m long by 7m wide. The condensation harvesting system I will fit at the border of this space as it is only pipes about 500mm wide and about 10m in length and can run with the currently installed irrigation pipes.. The underground tank I will not count as the slab for the tank forms the floor of a habitable room.

To summarise your answer I will split it into two options.


I hope this provide some detail on your question.
Title: Re: Water purification system for household
Post by: mygoggie on November 11, 2019, 11:04:47 PM
Speaking about piping in the above posts, here are some details about the pipes I had to install.

Basically there are:

The first draft was sketched out as you can see in the following two images.

The overall layout

(https://i.postimg.cc/WbNQdfzT/OTS-Household-Overall-pipes.png)



and the pipework from the skid to the underground tank and slow sand filter

(https://i.postimg.cc/qRJ0LBwZ/water-purification-pipes-page-1-1.png)



Here are the actual piping installed, finally leveled and positioned.

(https://i.postimg.cc/ZqJ1k7NW/IMG-20191012-101654.jpg)



Before and after pictures of the pipes to the slow sand filter and underground tank. I could not get to the legally required 450mm soil cover for the pipes and therefore installed warning plastic in case someone decided to make a veggie garden in this area.... wonder who asked me that question today ....?

(https://i.postimg.cc/m2Hx7FRg/IMG-20191011-145824.jpg)


(https://i.postimg.cc/vTCppG7y/IMG-20191012-103156.jpg)




Title: Re: Water purification system for household
Post by: Taeke on November 12, 2019, 10:12:47 AM
Very nice set up you doing !  :thumbs: I stay on a farm so i am responsible for my own water. I do have a "nice" system that works for me , the problem i for see is that the day when something happens to me my wife will not know what to do.... :teach:  :RTFM:. I hope you have got a nice manual or some instructing sheet if you either sell your property or want some one else to operate it for you?? :thinking:
Title: Re: Water purification system for household
Post by: mygoggie on November 12, 2019, 10:31:03 AM
Very nice set up you doing !  :thumbs: I stay on a farm so i am responsible for my own water. I do have a "nice" system that works for me , the problem i for see is that the day when something happens to me my wife will not know what to do.... :teach:  :RTFM:. I hope you have got a nice manual or some instructing sheet if you either sell your property or want some one else to operate it for you?? :thinking:

Good for you @Taeke  :dop:

I do not know if you are aware but it is a legal requirement that any water supply system must have an instruction and operator's manual. So best start writing yours!
Title: Re: Water purification system for household
Post by: mygoggie on November 12, 2019, 10:37:39 AM
I got up early this morning to install the drainage pipes. We are expecting some rain and I do not want to start using bailing as the only option of emptying the slow sand filter! Had enough of that on the yacht ...

Here are the two future filter chamber's drainage pipes installed.

(https://i.postimg.cc/TPH8HxtY/IMG-20191112-102031.jpg)




The future emergency overflow of the buffer tank and one of the two filter chamber drainage pipes. All drainage to discharge in the wetland from where it can be used for irrigation purposes.

(https://i.postimg.cc/Y9455PPN/IMG-20191112-102024.jpg)



This is the layout I am aiming for. I will make a few changes as I assemble as the theory never meets the practical side 100%.

(https://i.postimg.cc/Lsgv2MHs/Sand-filter-drainage-pipework.png)
Title: Re: Water purification system for household
Post by: AdrianPowrie on November 12, 2019, 12:19:20 PM
Hi Herman

Thanks for the really great reply!
So much thought provoking content here!

Really enjoying the process as well as getting a better idea on what and when needs to happen to realise this 25 year foresight of yours!

Looking forward to the next installation...

Regards
Adrian
Title: Re: Water purification system for household
Post by: mygoggie on November 13, 2019, 08:46:05 PM
If any PE based members are reading this thread, I do need some 21mm shutterboard for the project. So if you know of or have some to donate please PM me.  :dop:
Title: Re: Water purification system for household
Post by: mygoggie on November 14, 2019, 10:56:11 AM
Onto the designing and building of the control panels.

I have cut the backboards and laid out the positions for the equipment. Will post photos of the boards when I am assembling these.

I ordered a new Pi Zero to control the irrigation controller board I obtained over here in this board (https://www.avforums.co.za/index.php/topic,59088.msg733364.html#msg733364) so that is done. Then I dug in my workshop's storage and undusted (is that the correct word?) an old transformer that can do 230V->24VAC for use in the controlling circuits.

So having learned a lot about restoring transformers as part of my Quad 303 restoration process (https://www.avforums.co.za/index.php/topic,76695.msg900447.html#msg900447), I cleaned and tested the transformer. All looked good so I dunked it in varnish and let it hang overnight to dry.

(https://i.postimg.cc/g0d19YWh/IMG-20191114-090501.jpg)



Now she is baking a bit in the oven till all the varnish is nice and hard and sealed.

(https://i.postimg.cc/QMbwhR8y/IMG-20191114-102856.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 20, 2019, 11:12:17 PM
I have been busy on a number of areas of this project at the same time.

I finalised the design of the pipework, partitions and external rib support of the slow sand filter and ordered the required plywood panels and pipe fittings.

The weekend was spent installing the last of the pipe fittings and sanding down the older fibreglass surfaces in preparation for the new required fibreglass work and marking out the locating and securing holes for the new internal panels.

Tomorrow the new plywood panels are delivered so I had to get the preparation and other work completed before then. Today I had some spare time, so I got going very early and finished the fibreglass work on the sides of the slow sand filter.

Here are the external surfaces with new fibreglass joining the ribs to the sides and securing the sides together.

(https://i.postimg.cc/W4kHdYjT/IMG-20191120-130000.jpg)




The pipework for the outlet, overflow and drainage systems are now fully installed.

(https://i.postimg.cc/ydCrchY9/IMG-20191120-130013.jpg)



The internal pipe outlet fittings and the location and securing holes for the new panels all marked out and drilled. We had a sandstorm the weekend so everything is coated with a layer of sand.

(https://i.postimg.cc/4xM0NkDW/IMG-20191120-130154.jpg)

Title: Re: Water purification system for household
Post by: mygoggie on November 20, 2019, 11:19:48 PM
I completed the electric switchgear, irrigation controller and solar heater controller layouts on the backboards during the past few days.

Today was also spent drilling the new backboards, cutting and drilling the DIN rails and finger trunking to fit.

The two backboards laid out and drilled.

(https://i.postimg.cc/qv8Kg2YW/IMG-20191116-130238.jpg)



The DIN rail aluminium sections cut and marked out to be drilled.

(https://i.postimg.cc/1zsqFf1X/IMG-20191120-151334.jpg)



Drilling the 4,9mm diameter holes for the pop rivets I use to fasten the rails to the backboards.

(https://i.postimg.cc/bvg29pqT/IMG-20191120-151722.jpg)



All drilled and ready to be fastened to the boards.

(https://i.postimg.cc/4d3H8qdT/IMG-20191120-152756.jpg)


I have actually installed the finger trunking for the one panel, but I ran out of trunking and will have to buy another length tomorrow. Once done I will post some pictures of the panels ready for wiring.
Title: Re: Water purification system for household
Post by: mygoggie on November 21, 2019, 08:43:29 AM
This morning I had a nagging feeling I missed something in the design of the layout of the secondary control panel board. Low and behold, I checked again and yes, my feeling was right. The Opensprinkler PC board does not fit correctly. The PC board layout is off-centered from the physical board with the connectors sticking out on the one side.

So I ripped the DIN rail off the backing board and plugged the holes. I will double check, but I think I need to move the rail a bit upwards on the board. For now I am waiting on the glue to set.

(https://i.postimg.cc/CMv2HGqq/IMG-20191121-083029.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 21, 2019, 03:58:06 PM
And there we are! Two new control panel boards waiting for the switchgear, wires and lights ...  :rubhands:

(https://i.postimg.cc/j5J0CKKZ/IMG-20191121-155347.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 21, 2019, 04:03:45 PM
The plywood panels arrived. Tomorrow it is once again a very early morning to fibreglass the main panels before installing these in the slow sand filter tank.

Then off to do some work ... my piggy bank is running on reverse now after I bought some of the required electrical switchgear today!

(https://i.postimg.cc/W1Q7TPW2/IMG-20191121-100112.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 21, 2019, 05:36:31 PM
Did a dry fit test run with the control panels installed in the cabinets. Looking great!

(https://i.postimg.cc/PqPgJZkm/IMG-20191121-173227.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 22, 2019, 05:33:48 PM
Just as I was starting with the woodwork, the Boss arrived and ask if I can please paint a woman on a painting for her as she simply could not get her on canvas.

So starting from scratch and spending a relaxing 4 hours on canvas I think she looks lovely. Yes, its my wife's artwork so her name is at the bottom. I know who is boss.  :angel:

(https://i.postimg.cc/sDV7kSt4/76652250-146920499982485-5873135599937912832-o.jpg)

Title: Re: Water purification system for household
Post by: mygoggie on November 23, 2019, 08:56:45 PM
The slow sand filter is slowly taking shape. Yesterday I spent cutting some of the leftover boards from my order to build the float level chamber and assembling it.

This is basically what the design looks like in theory. Obviously a few changes will be done as I go along as theory only stretches so far

(https://i.postimg.cc/nrqmJBmK/Slow-sand-filter-Basic-design.jpg)



It has two separate filter chambers where water is trickle fed to the top of the structured filter. From there it drains down through the filter bed and is collected by the slotted manifold pipes at the bottom. The collected water flows upwards (under pressure from the water above the filter bed) in the weir pipes and then overflows into the storage tank from where it will be pumped, ultra filtered and ozonated before being fed into the house's reticulation system. This type of slow filter is one of the oldest know design to filter water and makes use of a biological slime layer found at the top of the filter bed to purify the water and kill most viruses and bacteria.

It is simple to operate, maintain and repair. As designed this filter will run for 8 years before sand will have to be replaced, with minor scraping to be done once in a while. No backwashing, no membranes to clean and replace, nothing to steal and no chemicals required.

I have to form the three chambers in the donated tank and for this I have ordered waterproof shutterply sheets and had these cut to my design requirements. So yesterday was also spent dry assembling the two bulkhead boards so that these were ready for today's fibreglass coat.

Just for the fun here is a short step by step on how to join two plywood sections in the correct way.

Firstly I marked out the centreline of the T-juntion of the two bulkheads and set out the drilling holes.

It is important not to drill straight through the plank as it will shatter and splinter on the other side, causing the joint not to be tight. So I use some insulation tape and marked the spade drill so that the sharp point will just penetrate the other side.

(https://i.postimg.cc/xdvfP5KS/IMG-20191122-084857.jpg)



And off we go ... drilling to depth.

(https://i.postimg.cc/024y5b8h/IMG-20191122-084842.jpg)



All the holes drilled on the one side. Time to flip the board, find the tiny holes on the other side and drill those back.

(https://i.postimg.cc/DzkfsH4g/IMG-20191122-084836.jpg)



Spot the tiny holes made by the spade drill's point!

(https://i.postimg.cc/BQjJz4xp/IMG-20191122-085052.jpg)



And drilling back into the partially drilled hole with one hole already drilled through.

(https://i.postimg.cc/G2bcgDQT/IMG-20191122-085058.jpg)



All the holes drilled and reamed. You need to ream the holes to create some space where the butted plank can expand into when the screw is screwed into the plank's edge.

(https://i.postimg.cc/D0MnzMK1/IMG-20191122-085714.jpg)



Always use confirmat screws when doing a T or butthead joint in plywood. These do not tear out nor strip and will create a super tight and strong joint.

(https://i.postimg.cc/xCg9wdxx/IMG-20191122-084947.jpg)



The two bulkhead boards clamped into position. Yeah, my own designed and made mobile modular workbench system works great!

(https://i.postimg.cc/Vv6zmc2Y/IMG-20191122-091652.jpg)


And four of the confirmat screws installed. This is enough to hold the boards in place and allows "new" screws to be installed during final assembling ensuring a good, solid and tight joint.

(https://i.postimg.cc/WpW2ShJt/IMG-20191122-092543.jpg)



I then disassembled the two boards and packed all up. Time for a B'day braai with some friends last night ... it was fun and a great B'day bash.

Title: Re: Water purification system for household
Post by: mygoggie on November 23, 2019, 09:23:00 PM
Today was the day to give each bulkhead board a layer of stranded matt fibreglass to give it a hard surface and protect it from the sand or any maintenance and/or cleaning operations.

I always prefer doing fibreglass work under a tree as it is nice and cool and well ventilated. So after the B'day bash of last night I was a slow starter this morning ... and took my time to set out a workspace, tear the stranded matting to size and get all the rollers, brushes, measuring and PPE gear laid out and on my body. I once had resin blown into my eye ... never again so eye protection is a must.

And off I went ... I had to call in the help of  :angrywife: as the wind was blowing badly and even though working in a very sheltered area, the matting still wanted to move a bit.

The first side of the two bulkhead boards finished and setting.

(https://i.postimg.cc/dtGJFnxZ/IMG-20191123-121948.jpg)


Three hours later I could start with the flip side surface. Another 2,5h later and here we are. All done and ready to set.

(https://i.postimg.cc/1Rn9Cy0H/IMG-20191123-170217.jpg)


The float level chamber was also done in stages. First the outside and then the inside.

(https://i.postimg.cc/XXS1xffT/IMG-20191123-170231.jpg)

(https://i.postimg.cc/J7fRSSPW/IMG-20191123-170226.jpg)


I will see if I feel like installing the bulkheads tomorrow. I need some rest as well!

Title: Re: Water purification system for household
Post by: mygoggie on November 24, 2019, 04:25:29 PM
This morning was such a lovely morning that I wanted to be outside. An early cup of coffee and then the fibreglassed boards started staring at me ... and I realised the week is going to be a very busy one at work so I need to get the boards out of the way.

So ... I cut the edges clean with a diamond cutter. An angle grinder makes fibreglass dust which is an excellent itching agent and grinds away an armature very quickly.  That is the Boston Terrier's shoe she plays with, not mine!

All done.

(https://i.postimg.cc/Fz26vPrW/IMG-20191124-101456.jpg)



A test fit and some more test fitting and some more test fitting ...

(https://i.postimg.cc/Jnzv5DYq/IMG-20191124-125031.jpg)



Finally the new bulkheads are in place as is the float level chamber. All fastened and ready to receive the inner corner fibreglass stripping.

(https://i.postimg.cc/BvgRFcpb/IMG-20191124-143341.jpg)



(https://i.postimg.cc/y80M1zSF/IMG-20191124-143350.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on November 26, 2019, 08:46:46 AM
I did not have much time yesterday to work on the project, but found some time last night before a late night internet meeting to make the mounting plate and assemble the irrigation controller (https://www.avforums.co.za/index.php/topic,59088.msg733364.html#msg733364).

It was a mission as the stand offs to mount the RPI had to match the header extender's height. I also used a too thick plate, which made drilling inaccurate, but it all worked out in the end.

(https://i.postimg.cc/vmS3gnZw/IMG-20191126-083536.jpg)



The standoff is too large to my liking, but that is how it is with this design. Still needs to the cleanup of the assembly ....

(https://i.postimg.cc/nLL3h2Z1/IMG-20191126-083850.jpg)
Title: Re: Water purification system for household
Post by: El Sid on November 26, 2019, 05:45:11 PM
Spectacular effort Herman!

PS: It looks to me like you didn't quite finish the "bottom" end of the painting?

Just as I was starting with the woodwork, the Boss arrived and ask if I can please paint a woman on a painting for her as she simply could not get her on canvas.

So starting from scratch and spending a relaxing 4 hours on canvas I think she looks lovely. Yes, its my wife's artwork so her name is at the bottom. I know who is boss.  :angel:

(https://i.postimg.cc/sDV7kSt4/76652250-146920499982485-5873135599937912832-o.jpg)


Title: Re: Water purification system for household
Post by: mygoggie on November 26, 2019, 08:54:26 PM
Spectacular effort Herman!

PS: It looks to me like you didn't quite finish the "bottom" end of the painting?

Thanks @El Sid much appreciated. Yeah, every painting must have something not completed and you need to complete it in your mind or imagination.
Title: Re: Water purification system for household
Post by: mygoggie on December 01, 2019, 04:52:54 PM
The past week I really had minimal time to work on this project. The last bit of work on the sand filter tank was when I installed the new bulkheads.

Friday I had some spare hours in the afternoon so I motivated myself to dress up like a spaceman with a full dust protection suit, eye protection shield and full ventilator and sand down the white flowcoat all along the new bulkhead joints. Man, that was a bloody mission. Cramped space, hot and almost zero viz due to the dust. But in the end after 2,5 torturous hours, it was done.  After vacuuming for another 30 minutes I could see my handiwork.

(https://i.postimg.cc/m2BMtv23/IMG-20191130-102722.jpg)


(https://i.postimg.cc/sx9hTcKZ/IMG-20191130-102711.jpg)


Yesterday, I got up early and ripped two meranti planks to make the 45 bevel planks to go into the corners.

All ready to be installed.

(https://i.postimg.cc/rwYtZzGg/IMG-20191130-102706.jpg)



Alas, yesterday was one of those days when something will go wrong if it has the slightest chance of seeing a gap to do so. It took me the whole day to install all the beveled corner pieces. I finished at 17h30 just in time to pack up, shower and drive to a mate of mine's house for a braai. I was wasted and it was an early night braai for us.

All done and ready for the fibreglass overlay.

(https://i.postimg.cc/FHKLx0S7/IMG-20191201-083208.jpg)



This little section took a long time to do with all the mitres to work out and cut.

(https://i.postimg.cc/02nSmVbT/IMG-20191201-083224.jpg)



This morning, I woke up and looked at the weather forecast. The predicted rain has vaporised like my little savings pig ... so I had to grab the opportunity to do the fibreglass work. Something I did not look forward to as there is nothing worse than fibreglassing in a confined space. OK, maybe sanding in the same space ...

Fortunately the Boss took pity on my and helped me by tearing the matting to size and handing these down for me to stick to the first coat of resin painted onto the surfaces.

Five hours later and all done. Looking pretty neat even if I say so myself.

(https://i.postimg.cc/FFj3Frms/IMG-20191201-154111.jpg)




It was so hot today that I almost had to add no catalyst to the resin ... I was really chased in this section, but a smaller sized mix each time was the secret to success.

(https://i.postimg.cc/DzJ49FBh/IMG-20191201-154121.jpg)



Tomorrow I will have buy some white poolcote and roll the tank out with it. Then onto making the ribs to support the polycarb ...
Title: Re: Water purification system for household
Post by: mygoggie on December 02, 2019, 09:20:18 PM
Early this morning I dragged the compressor out to the sand filter and sanded the inside surfaces of the tank. Once again looking like a spaceman ... after 1h I was drenched in sweat and decided to call it a day. I will clean tomorrow early while it is cool and then go to town and get the poolcoat.
Title: Re: Water purification system for household
Post by: Mars on December 03, 2019, 12:36:21 PM
Thanks for alerting me to this thread, Herman. Nice job. I also have to do a grey water filter system for my garden.
Title: Re: Water purification system for household
Post by: mygoggie on December 03, 2019, 12:41:22 PM
Thanks for alerting me to this thread, Herman. Nice job. I also have to do a grey water filter system for my garden.

Yes, you are the second person requesting info on the greywater system. I will need to get myself in order and write that up as there is basically only one correct and lasting way to handle greywater without you going grey in the process.
Title: Re: Water purification system for household
Post by: mygoggie on December 04, 2019, 07:24:33 PM
And the first coat of white poolcoat is on ...

(https://i.postimg.cc/0NPmKFHF/IMG-20191204-192011.jpg)

(https://i.postimg.cc/25GWQGs6/IMG-20191204-192018.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 05, 2019, 05:04:44 PM
While the sand filter tank is drying (and blowing full of sand again) I finished the transformer.

This is what I started off with.

(https://i.postimg.cc/XYqtmYjV/IMG-20191110-113303.jpg)



This is the final product ready to be mounted on the control panel's backboard.

(https://i.postimg.cc/3Jmkp35x/IMG_20191205_165213.jpg)

(https://i.postimg.cc/RCj3NNYY/IMG_20191205_165221.jpg)

Title: Re: Water purification system for household
Post by: mygoggie on December 07, 2019, 05:26:42 PM
The slow sand filter is finished on the inside. Now onto installing the ribs supporting the polycarb window, the pipework and then the sand in the filter.

(https://i.postimg.cc/kGSMvhK3/IMG-20191207-171524.jpg)




The camera got confused with whiteout ... now imagine you are a bee or some other flying insect and the whiteout hits you...

(https://i.postimg.cc/7PJL4bcs/IMG-20191207-171516.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 07, 2019, 05:29:57 PM
The last of the pipes to go into the project arrived yesterday morning.

(https://i.postimg.cc/MKkppqJW/IMG_20191207_171456.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 07, 2019, 05:32:21 PM
I made some time yesterday afternoon to do the draft layout of the two control panel boards. It will work great!

Now I need to save to buy three more pump controllers.  :help:

(https://i.postimg.cc/VLjLSpzX/IMG_20191207_171805.jpg)
Title: Re: Water purification system for household
Post by: El Sid on December 09, 2019, 05:31:57 PM
Very impressive Herman. But it does show what a serious undertaking a proper recycling system is, and beyond the means and/or abilities of the average schmo. A commercial system with these capabilities would cost tens of thousands if not far off R100k? Something to aspire to.

PS: did you hook the transformer out an old valve amp?  :ROFLMAO:

(https://i.postimg.cc/XYqtmYjV/IMG-20191110-113303.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 09, 2019, 06:32:31 PM
Very impressive Herman. But it does show what a serious undertaking a proper recycling system is, and beyond the means and/or abilities of the average schmo. A commercial system with these capabilities would cost tens of thousands if not far off R100k? Something to aspire to.

PS: did you hook the transformer out an old valve amp?  :ROFLMAO:

Yes @El Sid it is costing a bit. I need to go and do the sums, but materials cost so far is not far off R35k. However if you want something that works and requires almost no maintenance then you must design and build it to do so. Too many systems you can buy today to recover greywater and clean water is simply designed to make money out of the unknowing consumer. Sad but true.

The transformer is actually from an old HO train set my Dad had when I was one digit old. I found it in his garage when we cleared the cupboards...
Title: Re: Water purification system for household
Post by: mygoggie on December 21, 2019, 05:06:21 PM
Finally ... I have finished upgrading (and renovating the underground water tank). What was supposed to be a simple installation job to install a float level switch and a new inlet pipe to the underground tank, turned into a real project.

When I opened the concrete manhole cover, I found that one of the trees have managed to get its roots into the tank and that is a big no no  :nono:

So I had to clean the tank, allow it to dry, dress up like a spaceman with full face mask and ventilation and sand down the fibreglass joint where the two fibreglass rings that forms the tank were joined about 10 years ago. My son did the tank installation when he was still at school and he did a very good job for it to last for so long with no maintenance.

Man what a task it was to sand everything clean, and then apply new fibreglass matting and resin. To do this in a confined space can quickly lead to respiratory issues so I had to take all precautions.

After two weeks of working on the tank, I could finally close the lid today.

Here is a peek down the manhole with all the services installed on the left hand tank wall.

(https://i.postimg.cc/fb8V3bvy/IMG-20191221-134923.jpg)



The repaired joint with three new layers of woven and stranded matting.

(https://i.postimg.cc/mrLc29CK/IMG-20191221-135019.jpg)

(https://i.postimg.cc/PxNP1k64/IMG-20191221-135009.jpg)


The submersible pump that has been going strong for ten years with no complaints.

(https://i.postimg.cc/T1D1HJv5/IMG-20191221-135128.jpg)



The new float level switch on the right hand side of the picture with the new inlet from the other two tanks on the left hand side. So FLTR you can see, inlet from tanks 1 and 2, pump feed pipe to tank 1, rainwater pipe from the roof, 230VAC sleeve with cable to the pump, sleeve with cable from the float level switch that runs to the controller cabinet on the skid.

(https://i.postimg.cc/HxKj2PRC/IMG-20191221-135116.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 22, 2019, 07:42:02 PM
I had the following reply on the duplicate thread on 4x4community.
Quote
This is an amazing project.

Can you prevent the tree thing happening again?

Or is this something you will do each time there is maintenance?

My answer is as follows:
I cut the roots back and then coated the whole area with a very strong copper sulfate solution. This should prevent the roots from growing again in this area. With roots you never know where they will grow to!

Root clearance is basically a normal maintenance issue on any underground water related infrastructure. Just ask any plumber many sewerage lines are blocked by roots...
Title: Re: Water purification system for household
Post by: mygoggie on December 22, 2019, 07:44:36 PM
This morning no wind was blowing so I grabbed the chance to locate all the through hole fittings in the slow sand filter and drill the holes.

Why do you always need so many tools to do even the simplest of jobs?

(https://i.postimg.cc/44Dv0jGy/IMG-20191222-094403.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 23, 2019, 04:04:49 PM
After taking a good afternoon 40 winks I installed the through-hole fittings in the slow sand filter. The leaves and sand were blown in over the last three days ... bane of my life!

At the top, the two inlet lines supplied from the small pump.

(https://i.postimg.cc/9XP0q375/IMG-20191223-155452.jpg)



The float level chamber inlet on the left and the other side of the filter inlet lines on the right. The pencil line is where the drilled inlet pipe will be located.

(https://i.postimg.cc/BQq6ThT8/IMG-20191223-155459.jpg)



The outlet weirs feeding into the holding tank. The blue weir risers are not glued yet as I still need to tighten all the nuts after the sealant has cured. The correct way to ensure a watertight joint is to put down a bead all around the flanged nuts, press the piece in and hand tighten the nuts. Once cured you use a correct nut spanner and tension the nuts which will compress the cured sealant and create a very good waterproof seal.

(https://i.postimg.cc/TYCPCr0t/IMG-20191223-155516.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 25, 2019, 05:30:28 PM
With the family from all parts of the world here for Christmas, I have limited time to work on this project. Much more fun playing with the grandkids!

So yesterday was spent figuring out the inlet manifold's piping and layout while my grandson assisted me. Once this was done, I cut all the pipes and then went onto the task of drilling a gazillion holes.

I made a piece of wood exactly the same width as the uPVC piping and on this draw a center line to locate the vise.

(https://i.postimg.cc/1XctcCcJ/IMG-20191224-145030.jpg)




The pipe located and ready to be marked for drilling.

(https://i.postimg.cc/Vsjd8vQn/IMG-20191224-145521.jpg)




Marking the line where the holes will be located. The easiest is to use an old woodwork method and simply use your hand as a guide and draw the line all along the pipe using a B6 pencil.

(https://i.postimg.cc/B62Q4Yy4/IMG-20191224-150105.jpg)




This morning while everyone was preparing for Christmas lunch, I had some time off as I made breakfast ...  :angel: I made use of the time to glue the pipes into the two manifolds. The first manifold (as always) took some time to figure out the assembling sequence. The second one went much more quickly.

The idea is that the water will flow from the manifold via the gazillion holes and in a non-disturbing way onto the water surface in the two filter chambers.

So there they are, patiently laying and waiting for me to connect the inlet line onto each.

(https://i.postimg.cc/YSGCyqz4/IMG-20191225-164923.jpg)


(https://i.postimg.cc/pdwLNbss/IMG-20191225-164934.jpg)



A close-up of the holes facing slightly downwards.

(https://i.postimg.cc/SsR7P9t6/IMG-20191225-172612.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 26, 2019, 01:07:35 PM
I had a very good reply on the duplicate thread  (https://www.4x4community.co.za/forum/showthread.php/322805-Household-sized-water-and-energy-system?p=4294117#post4294117)over on The 4x4 Community forum.

This is my detailed answer with quotes from that reply. Maybe it makes someone thinks!

Quote from: RussellF;4294117
A slow sand filter to purify the rainwater, condensation and well point water to potable standards.

Interesting project you have going there, lot's of work too ... thumbs up

What with Cape Town's water problem for the moment being a thing of the past its been a while since I looked into slow-sand filters.

The plan at that stage was to filter wellpoint water using a 150l geyser tank as reservoir gravity feeding two series connected 200l food-grade plastic drums. Oxygenation / o-zone and UV sterilisation being done in the 150l tank.

From what I can gather water treatment is one of your specialities. A few queries if I may...

Yes, you are correct, it is one of my fields of specialisation. Thanks for the "thumbs up"!

Quote
Those holes look about 5mm; are they not too big or will there be a mesh diffuser below the inlet pipes ?
The holes are in fact 3mm diam reamed on the downstream side to give a better flow. I have found that anything smaller creates problems. Let's see when the water comes out the first time!

Quote
From my readings is it not advisable to fit baffle plates to the filter walls - so that water along the filter wall is directed into the sand and not percolate down along the wall ?

Baffles along the wall is a waste of time and money as it might prevent percolating ever so slightly as you said, but such plates will greatly increase the trouble factor when scraping the sand layer.

Quote
Your two filters appear to be in parallel, does this mean that following backwash that filter will be out of action for the week or two until the bio-layer has re-formed ?
(my plan with two series connected filters was following backwash that filter would become the secondary, the one with intact bio always being the primary)

Yes, you are correct, the two filters are designed to be in parallel ensuring one filter is always in operation. The sludge bed (bio-layer) or better known as the schmutzdecke takes a while to form before being effective after the sand bed has been scraped. In this design I allowed two weeks for the formation of an effective schmutzdecke.

You never backwash a slow sand filter. You only scrape the top 5mm of the sand bed away. In this small scale design I am hoping that this sand can be dried in the sun and washed before being stored for future use. Your series design is in fact a process parallel design so it should work 100%.


Quote
How many litres per day are you expecting the filters to deliver; what is its surface area and volume ?

I calculated the delivery rate for this filter size to be in the order of 1m3/24h which is for a normal household of 4 people about 250 liters/person/day. This is way more than the 50 liters we are allowed at the moment in Port Elizabeth. The design standard is normally 1 000 liters per household (or equivalent erven) per day so you can see it is sized on par.

The dimensions of each of the filters are 800mm (L) x 740mm (W) x 1050 (H).

Quote
What is the purpose of the clear polycarb window ?

The tank was used to develop a water aerator before donated to me. So the polycarb window was used to film through. I did not see the need to change it as it will give me a visible indication of the performance of the sand filter. After all this is also an experimental design.

Quote
What sand will you be using and from which supplier ?
(at the time of my enquiry the only supplier I could identify was Cape Silica but they didn't have the grades of sand recommended in the literature and apart from quoting on what they had available never responded to my query of other grades)

I sit with the same issue re sand. Filter sand for swimming pools are too course, so I have not been able to find anything suitable over here. I am thinking of using some of the aeolian sand from the beach for the top layer as this has a normal particle size in the order of 0,15mm which is required for the top layer. The second layer requires a particle size of 0,35mm, but alas, that I cannot find. So I think I need to buy a sieve and simply seive some sand to that size.

Quote
On the pipes, resin, etc is BPA not as significant a problem as my interpretation of the literature seems to suggest ?
(I'm known to be overly pedantic - I like my chest broad and flat, just like its always been

With BPA I assume you mean Bisphenol A. There is more BPA in your yuppie bottled water than this system will ever generate so I am not concerned. There are no BPA in uPVC piping nor the ISO NPG (isophthalic neopentyl glycol) based poolcote. So yeah, I always wonder if yuppie bottled water drinkers know why they have such attractive chests ...

Hope the answers help! Was good to read your questions
Title: Re: Water purification system for household
Post by: mygoggie on December 27, 2019, 11:22:15 AM
Quote
Thank you for the time and effort of responding to my queries.

For what its worth attached is the price list from Cape Silica. You're gonna need about 1800kg and at the quoted prices well worth the effort to purchase screens and DIY the grading, washing and sterilisation.

In the new year I'll stop off by a distant acquaintance and enquire from him where to purchase the SS screens - that's if he hasn't retired to Garies.
Title: Re: Water purification system for household
Post by: mygoggie on December 27, 2019, 11:22:57 AM
Quote
Maybe these will be of help..
https://www.puresteel.co.za/woven-mesh.html
http://www.stainlesstradingsa.com/pr...wire-mesh.html
http://www.alliedmesh.co.za/mesh.htm...CAAEgKWCvD_BwE
Title: Re: Water purification system for household
Post by: mygoggie on December 27, 2019, 04:28:05 PM
Another miserable windy day with the wind blowing right through the night at 40+ knots. So no beach time, the kids went to the mall which I hate, so I installed the sand filter outlet manifolds today.

The first thing to do was to vacuum all the chambers clean as working in dirty conditions is simply asking for trouble. Then onto installing uPVC adapters onto the threaded outlet through-hole nipple.

Alas there was no space to wrap the thread tape directly from the roll.

(https://i.postimg.cc/Hnm2q3Z8/IMG_20191227_092928.jpg)



So I used a trick where you roll the tape onto a pencil and from there you can easily roll it onto the nipple end.

(https://i.postimg.cc/yxTPs9tQ/IMG_20191227_093157.jpg)


(https://i.postimg.cc/bvG3kZSr/IMG_20191227_093140.jpg)



All done and some sealant added onto the end for good measure.

(https://i.postimg.cc/Z5swW8RX/IMG_20191227_092348.jpg)



I had to freeze the manifold for an hour to get it to crimp enough to slide in between the faces of the unions without pinching the O-ring. The two manifolds installed with the collection branches simply sliding into position. I am not going to glue these in place in case these must be cleaned or upgraded in future. Yes, the pipes still to be slotted or drilled. I am pondering on the best way to do this.

(https://i.postimg.cc/DyBgNrqm/IMG_20191227_160736.jpg)


(https://i.postimg.cc/dV3BchB6/IMG_20191227_160845.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 27, 2019, 04:33:50 PM
I also found some time to install the overflow riser pipe. It is important to understand that water will always flow over an edge at a maximum depth we call the critical depth. This cannot be increased, so the only way to increase the volume of water to accommodate is to increase the length of the edge. In this case I increased the length by installing a reducer bush onto the top of the pipe. I have allowed freeboard of 35mm after which the overflow pipe will start discharging. Hopefully at a volume greater than any inflow! This is one thing I did not calculate and just used my gut feeling. Let's see how accurate it was!  :whistler:

(https://i.postimg.cc/gcy4VFjV/IMG_20191227_160727.jpg)


Also the two float level chamber isolation valves were glued into place. This will allow maintenance on any one of the two chambers while still maintaining the water level in the float level chamber. Did I mention that I cleaned everything this morning ... ?

(https://i.postimg.cc/ZKTHj7v1/IMG_20191227_160838.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on December 28, 2019, 09:41:02 AM
Today is sand sizing day. I read up on a few very old design manuals and it appears that bacterial removal is dependent on the sand diameter.

The following two tables show that the ideal size is in the order of 0,15mm. This is the size I originally decided upon.

(https://i.postimg.cc/WpgVbGpN/Screenshot-2019-12-28-at-09-36-24.png)



What is interesting is that the sand particles must be round for optimum filtration, so the wind blown dune sand will be ideal from this perspective.

I will measure some samples for size and see what is what.
Title: Re: Water purification system for household
Post by: mygoggie on December 28, 2019, 03:09:03 PM
Quote
This is interesting. Did they use a uniform particle size throughout, or do they layer different sizes?

The sand itself can be two layers at most. In my design I allowed for the top 350mm layer to be 0,15mm and the 400mm layer below that sand particles of 0,35mm diameter.

Below this then various gravel layers to form a progressive supporting structure. The following table shows what is normally used in the industry to design the supportive layer as well as the headloss over each layer. As can be seen the headloss is minimal in the supporting structure.

(https://i.postimg.cc/Zqj8N78r/Screenshot-2019-12-28-at-14-41-09.png)


(https://i.postimg.cc/wBPhFtrv/Screenshot-2019-12-28-at-14-42-47.png)
Title: Re: Water purification system for household
Post by: mygoggie on December 28, 2019, 03:12:51 PM
Quote
Quote Originally Posted by RussellF
The following two tables show that the ideal size is in the order of 0,15mm. This is the size I originally decided upon.


Would be interesting to see if those tables also relate sand size, depth of sand with flow rate. There's a tradeoff between grain size and depth of sand, pathogen removal and flow (water production rate).

Too fine a sand and you get low usable flow, its only the 5cm of water above the sand that is supplying head pressure to push the water thru the filter.

The 2 or 3 documents I've seen suggest a grain size of 0.15 - 0.35mm with some ratio (which I don't yet understand) between the grain sizes. They go to some length putting a sample of sand thru several screens of various sizes then weighing each size and calculating a "uniformity coeff".

Anycase what is clear to me though is that pre and post-processing of the water is needed with slow-sand being just one component. UV and chlorination being the primary (and guaranteed) pathogen killer with slow-sand, while aiding pathogen removal, being the means to improve the taste, smell and clarity of the water.
The optimum flow rate from numerous slow sand filter monitoring research projects showed a figure of 0,1m/hr vertical.

Flow through the sand bed is created by the pressure differential (energy gradient) between the top of the headwater (the water depth above the sand bed) and the top of the outlet weir. For this reason the outlet weir's top edge is made to be vertically adjustable to compensate for any increased loss of energy in the sand filter.

The ratio of sand you mention is a standard logarithmic gradient scale that is used to grade any soil particle size. Obviously a long rice grain can pass through a sieve opening slightly larger than the grain's diameter, but the length is much greater than the sieve opening. For this reason there are range percentages allocated per particle size. Academics can always make a gigantic mountain of a simple anthill whereas a simple anthill is good enough to serve as a lookout post for a cheetah as it offers all he needs to spot his prey. The same with grading of soil. A simple average of particle size will work fine. A designed filter sand mix will only work slightly better ...

The one reason I love slow sand filtration is that it removes Cryptosporidium oocysts. This is (and I quote) "A water-borne protozoan parasite that contaminates drinking water supplies, causing intestinal infections in human beings and domestic animals". Chlorination does not kill this parasite.

I always design filtration with ozone sterilasation. It is cheap, much more effective as an oxidiser than chlorine and oxidates the water as well, improving the taste. UV lights are expensive, breaks easily, requires regular cleaning and any bacteria or parasite hiding behind a dust particle is not killed by the UV light.
Title: Re: Water purification system for household
Post by: mygoggie on December 28, 2019, 03:27:53 PM
After spending some time on the sand particle size, I decided to move onto making the filter collection tubes.

At first I thought of drilling the holes as per the inlet manifold, but that would have taken a LOT of time. So I chose slots as the way to go. To ensure the pipe is not too flexible I broke the length down into three segments of slots.

Out came the CAD and I designed a template I can stick on the pipe to cut accordingly. Here is the template.

(https://i.postimg.cc/g0vYtQSZ/outlet-collector-h0le-template.jpg)



Three templates per pipe was stuck to the pipe with a spray adhesive like this.

(https://i.postimg.cc/C1qK0dxz/IMG_20191228_115839.jpg)



The pipe with the templates, ready to be slotted.

(https://i.postimg.cc/9QkVfVST/IMG_20191228_115851.jpg)



The first set I cut with a hacksaw, but the edges were too rough and a lot of cuttings were stuck to the slot edges.

(https://i.postimg.cc/prvPtZS6/IMG_20191228_121259.jpg)



I tried to clean it with a wire well, wire brush, sand blasting and nothing worked for the inside edge.

(https://i.postimg.cc/GtPhBNYR/IMG-20191228-121640.jpg)

(https://i.postimg.cc/PJMTfDsr/IMG_20191228_121645.jpg)



So I took out the Dremel with a flexible shaft extension and cut all the slots with this.

(https://i.postimg.cc/KYgbkwSW/IMG_20191228_132546.jpg)



Although not perfect the slotted collection pipe came out OK and functional.

(https://i.postimg.cc/mZ3byvzf/IMG_20191228_141925.jpg)



Installed in the filter chamber. Looks good! For the next round, I will use a pencil grinder with a larger disk as the Dremel is slow going. Let's see  :roll:

(https://i.postimg.cc/Pxsjmyd5/IMG_20191228_142356.jpg)

(http://)
Title: Re: Water purification system for household
Post by: mygoggie on December 29, 2019, 03:41:37 PM
Quote
Good info thanks! particularly those last tables

With droughts in large parts of the country, increasing dysfunction within water and sewerage treatment works & reticulation, the availability of potable water will be the next big thing.

In the new decade it'll make Eskom look like a non-event. Just as with PV it'll become necessary for each of us to self-provide.
Title: Re: Water purification system for household
Post by: mygoggie on December 29, 2019, 03:42:35 PM
Quote
Originally Posted by Woolf
Can you not use the pipes from a pool sand filter?

I guess one can, but the last time i priced these, it was like overly expensive for what you get.
Title: Re: Water purification system for household
Post by: mygoggie on December 30, 2019, 09:39:35 AM
Quote
Originally Posted by RussellF
Looks like your filling of the filter is imminent, not to be alarmist but simply to confirm that the ribs and joints (shown pg 3) are okay not to flex and crack.

It'll be a crying shame if, after all your efforts and once filled, the structure bows and flexes and the sand has to be removed to effect repairs and reinforcement.

(in such a case I'd suggest arranging a day outing for the local pre-schoolers to come and dig out the wet sand - you can apologise to the parents afterward ... reminds me of my 5 year old niece volunteering for a particular chore and midway thru quite spontaneously saying "oh my back!")

You are quite correct. The ribs at this stage are inadequate. I have made the ones to be installed across the polycarb window, but alas, I need to assemble these first and then give the assembled part a layer of fibreglass to secure all joints. Then this to be fastened to the rest of the rib system to form a closed ring.

I will tackle that either today or tomorrow...

The sand idea sounds great! :-D Seriously, that is the last thing I need. Child labourers and a failing support systems ...
Title: Re: Water purification system for household
Post by: mygoggie on December 30, 2019, 05:42:41 PM
Guess on what planet did I spent some time today?

While I was there, I spent 90 earth minutes cutting all the slots in the remaining five tubes.

(https://i.postimg.cc/zGwB3F3C/IMG-20191230-160327.jpg)



Sanded and cleaned and ready to be installed.

(https://i.postimg.cc/qq9R6m8L/IMG-20191230-165101.jpg)



And installed!

(https://i.postimg.cc/Bb8b6W1b/IMG-20191230-165330.jpg)



(https://i.postimg.cc/tRf7cgLx/IMG-20191230-165338.jpg)
Title: Re: Water purification system for household
Post by: ALIGMUZ on January 15, 2020, 04:54:31 PM
Lovely - blue hands - blue planet. uPVC - brings back fond memories of designing and building aquaculture experiments. Thanks for taking the time to share your expertise and project, multiple talents you have. Thanks and best of luck.
Title: Re: Water purification system for household
Post by: mygoggie on January 15, 2020, 06:07:58 PM
Lovely - blue hands - blue planet. uPVC - brings back fond memories of designing and building aquaculture experiments. Thanks for taking the time to share your expertise and project, multiple talents you have. Thanks and best of luck.

Fond memories are treasures ... Thanks for the kind words!

I am a bit quiet with the project as I am finishing up rebuilding my Pajero's suspension and drivetrain. Too many things!  :dop:
Title: Re: Water purification system for household
Post by: mygoggie on February 19, 2020, 12:25:26 PM
I have been quiet on this front as I need to prioritise my time. I was offered a very good job in New Zealand and because it allows me to tour while working (and of course the salary  :rubhands: ) I could not refuse.

So I spent the month of January finishing my Pajero restoration project.

There he is ... all rubbers, seals, bushes, bearings, universals and ball joints, brake, clutch and steering hydraulic systems replaced and or rebuilt. Was fun but took a loooong time and quite a bit of money.

Next to finish onboard dual air system (low pressure for diffs and gearbox pressure and high for pumping wheels and of course air mattresses) and dual battery system with PV panels on the roof rack.


(https://i.postimg.cc/fW7r4zzG/IMG-20200219-120528.jpg)

(https://i.postimg.cc/1XS7gTH7/IMG-20200219-120507.jpg)

(https://i.postimg.cc/Wb2fTBth/IMG-20200219-120501.jpg)



Title: Re: Water purification system for household
Post by: mygoggie on March 09, 2020, 04:04:39 PM
Been a crazy few weeks. Fixed the Pajero and then onto all the outstanding projects in the house to get the completed before my time in New Zealand starts.

The last three days was recycling some old meranti flooring and building various door jambs, doors and lastly the covering for the sand filter.

I also moved the research biogas reactor into the little research area so that everything is nicely together for a showcase.

Here is the doorjamb from old flooring with a recycled door I made and installed.

(https://i.postimg.cc/3Jsb632k/IMG-20200309-155952.jpg)



The research reactor in place next to the sand filter.

(https://i.postimg.cc/Ss1gG4yN/IMG-20200309-142537.jpg)



The little research area

(https://i.postimg.cc/j2WZg156/IMG-20200309-142547.jpg)



The new wood covering also serves as a shield to block the "ugly" research area ...  :whistler:  not my words ...  :shh:

(https://i.postimg.cc/Vv343Frx/IMG-20200309-142651.jpg)



Title: Re: Water purification system for household
Post by: mygoggie on March 19, 2020, 09:00:04 PM
This has been a real chaotic week. First our flights via Doha was cancelled and this morning New Zealand locked their borders after I bought another set of flight tickets. So it appears I will not start work in New Zealand any time soon.

So now I have some time completing the water purification system.

Here is an update showing the completed screening wall I built from old floor planks.

(https://i.postimg.cc/MHF4rg2z/IMG-20200314-073120.jpg)
Title: Re: Water purification system for household
Post by: HB on March 19, 2020, 11:01:46 PM
Stunning!!  :thumbs:
Title: Re: Water purification system for household
Post by: mygoggie on March 29, 2020, 11:09:04 AM
And I suddenly was given 21 days to work on this project!  :2thumbs:

Only problem is I have to find everything again after the big packing exercise before we were supposed to depart for New Zealand.

Today I started off with the sand filter lids to keep the sand and leaves out of the filter.

All set out and overlap strips ready to be glued in place.

(https://i.postimg.cc/kgCW1hdt/IMG-20200328-083829.jpg)



Glued and screwed ..

(https://i.postimg.cc/v8pr9Zqh/IMG-20200328-090002.jpg)



Waiting to be fibreglassed. The best place to do fibreglass work is under a tree as it is well ventilated, in the shade and just feels good. Many a fibreglass sailboat was born under a tree! My 32' Sadler actually had a leaf embedded in the hull!

(https://i.postimg.cc/Pf8ZtkXw/Whats-App-Image-2020-03-28-at-09-30-13.jpg)


All done and curing.

(https://i.postimg.cc/4NVz1Rjg/IMG_20200328_104034.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on March 29, 2020, 11:25:12 AM
I also did the drain valve, emergency overflow and inlet valves for the sandfilter.

Here are the three pipes and valves installed.

(https://i.postimg.cc/G2vc5zRH/IMG-20200329-111634.jpg)



The outlet feed to the pressure pump going into the ground

(https://i.postimg.cc/xdwf5hWw/IMG-20200329-111623.jpg)


Now I need to open up the sand compartment drain valves and piping to connect that to the newly installed drain piping.
Title: Re: Water purification system for household
Post by: mygoggie on April 19, 2020, 04:32:53 PM
Today I had some time to install the final run of piping for the drainage line.

It took quite a bit of time as I had to measure in three dimensions and get the sequence of gluing right to ensure I could get the pipes and fittings all glued correctly.

Here is the first dry run on the installed pipes and fittings.

(https://i.postimg.cc/fWr2jJry/IMG-20200419-160408.jpg)



Completed with the sleeper cut to fit and the gravel surfaces restored.

(https://i.postimg.cc/yY3ffsMP/IMG-20200419-162028.jpg)
Title: Re: Water purification system for household
Post by: d0dja on April 20, 2020, 09:55:50 AM
Very smart. Only problem is I can see people getting pissed trying to find the door to the nice-looking sauna you've built there.
Title: Re: Water purification system for household
Post by: mygoggie on April 21, 2020, 05:31:22 PM
The last three days was spent installing the inlet pipes and valves. Why does things take so long?? OK maybe because I am a bit more relaxed with this wonderful holiday we have been gifted with.  :dop:

I first had to measure out where the inlet manifold valves will be located. This took a while since I had to measure on the sand filter side of wall and then draw the dimensions on the other side of the wall.

The first try and holding thumbs that the hole is correctly located. Drilled out the plank and then cut it with a keyhole saw.

(https://i.postimg.cc/cLXwV790/IMG_20200420_082833.jpg)



Not too shabby in my measurements as the hole I cut was located spot on!

(https://i.postimg.cc/3N5vgtRC/IMG_20200420_083204.jpg)



Both holes cut and tidied up.

(https://i.postimg.cc/nzQmjyHh/IMG_20200420_083833.jpg)


The first valve installed after cutting the threaded nipple to the required length.

(https://i.postimg.cc/Jh0ZmyvJ/IMG_20200420_130516.jpg)



And both valves installed.

(https://i.postimg.cc/XvPFvj6P/IMG_20200420_130450.jpg)


Title: Re: Water purification system for household
Post by: mygoggie on April 21, 2020, 09:23:23 PM
Onto installing the pipes that feed the inlet manifolds and conduit for the level sensor's cable.

The first try worked out great even though I had to make a plan as buying fittings are not an option. I had to heat the uPVC pipe and bend it to suit the route without damaging the pipe walls.

(https://i.postimg.cc/vm42L4Kz/IMG-20200421-082205.jpg)


All done.

(https://i.postimg.cc/LXfywr2g/IMG-20200421-102630.jpg)


A bit of grey paint will make the pipes blend in very well against the wood wall. I am happy with the result.

(https://i.postimg.cc/5Nmrxdvw/IMG-20200421-102640.jpg)


Before I close up the trench, I have to install the bolts holding vertical rib's tie beams together. I started off with the easy corners.

(https://i.postimg.cc/VkGHCqKv/IMG-20200421-115018.jpg)



At the top corners, I had to recess the one bolt to allow the lids to fit over the bolt head. I will need to get the hole sealed as the wood will rot if not protected.

(https://i.postimg.cc/dVtx3Hmg/IMG-20200421-122123.jpg)


To get into the corners behind the wall, I had to undo some planking to get my hands into the space behind the wall. Not serious as I can screw the planks back into place once I have completed the bolting exercise.

(https://i.postimg.cc/pd3G02bt/IMG-20200421-122053.jpg)


Tomorrow I will finish up the outstanding front ribs, and the one lower tie beam on the one side. Let's see how far I can get with that!


Title: Re: Water purification system for household
Post by: mygoggie on April 28, 2020, 12:18:10 AM
The last few days were spent doing the tedious job of making covers for the valve openings.

It looks like a simple job, but these are deceivingly tedious jobs. The top cover will be a removable door screwed to the wall covering the opening from the top half of the pipes to the top of the opening. The bottom section will be permanent and will be screwed into place.

The first step was to make a backing bar for the bottom planks to be screwed to. I used some brandering from my scrap heap and cut this to length.

(https://i.postimg.cc/BnL32rmr/IMG-20200426-114804.jpg)



The length looks good.

(https://i.postimg.cc/hvZFdsT4/IMG-20200426-115015.jpg)



Creating a recess in the bar to allow the valve's union ring to be loosened.

(https://i.postimg.cc/Kj0b5xS2/IMG-20200426-121451.jpg)



After I cut the bottom planks, I could measure where the cutout for the pipe should be. Drilling the cutout using a hole saw with a backing piece of scrap to drill into as a guide for the hole saw.

(https://i.postimg.cc/PfydHzLR/IMG-20200426-133441.jpg)



Looking good

(https://i.postimg.cc/sfTCqjqF/IMG-20200426-133459.jpg)



The other opening's spanned over two planks so I had to clamp all the planks in the vice and drill these while clamped as a board.

(https://i.postimg.cc/3xsT1t6d/IMG-20200426-134756.jpg)



The left hand valve opening's bottom section in place.

(https://i.postimg.cc/CLKSxBkL/IMG-20200426-134240.jpg)



Both openings bottom halves done.

(https://i.postimg.cc/2ySRyMqX/IMG-20200426-141637.jpg)



Today was spent making the two top halves. Here are all the planks cut, frames sized and being glued.

(https://i.postimg.cc/vHSMgYt7/IMG-20200427-123627.jpg)



Glued and screwed together awaiting cutting of the pipe cutouts.

(https://i.postimg.cc/C1YVTzw0/IMG-20200427-152032.jpg)


And all done!

(https://i.postimg.cc/630x9tQv/IMG-20200427-173042.jpg)


I will varnish these tomorrow and then screw them in place.





Title: Re: Water purification system for household
Post by: mygoggie on April 28, 2020, 04:46:46 PM
And there we are, all covers on the one side of the wall installed and varnished.

(https://i.postimg.cc/C54xP7Kp/IMG-20200428-141913.jpg)



On the other section of wall, the bottom halves are done. This was not an easy job as there are only small distances to work with between pipe and wood surfaces. I still need to cut the top of the opening to make the edge straight. The one handle is in the way, so I think I will simply pull it off and cable tie it to the valve for future use.

(https://i.postimg.cc/MHwGmNqY/IMG-20200428-164046.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on April 29, 2020, 09:09:21 PM
Two more covers made today. This was a mission ...

(https://i.postimg.cc/GpC71t4c/IMG-20200429-175658.jpg)



Test fit and the right hand cover came out lower than the other one. So I had to remove the frame and adjust. No idea why this happened as I measured twice before assembling the frames. Anyway .. all good now. Will post a pic tomorrow.

(https://i.postimg.cc/1zrWRSFD/IMG-20200429-175855.jpg)


I still need to fit some foam in the gap between wood and pipe as I do not want to go through a bee invasion and hiving exercise again ...
Title: Re: Water purification system for household
Post by: mygoggie on April 30, 2020, 01:45:34 PM
Covers done. Yeah!

(https://i.postimg.cc/kG0yQQpP/IMG-20200430-114324.jpg)



Backfilled and leveled. I am making a wooden draw box that matches the two valve covers for the central located level float sleeve. This will look much better than a plastic 4x4 box.

(https://i.postimg.cc/fWVnvMr8/IMG-20200430-132943.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on April 30, 2020, 03:54:18 PM
I had a few questions on the other form so here is a copy of the post.

Quote from: RussellF;4381327
of your original list above, which have been ticked-off and how is it performing ?

The design incorporates the following components:

   
Quote
busy, busy & looking good
As always @RussellF ...

Quote
I notice from the pic on post #88 that part of the control panel is fully wired; which part is that ?
(and don't answer "the part on the left")

(https://i.postimg.cc/Ss1gG4yN/IMG_20200309_142537.jpg)

It is the mirror side of the part on the right.  :P  That is the control panel of the biogas reactor which has been in testing for four years now.

Quote
on the biogas ... is it for sewerage and such. is the effort worth the yield instead of say generating compost ?
Yes it is to purify sewerage and then all kitchen organic waste and such from the garden. The household reactor can produce enough gas per day to cook three full meals. Here is a marketing brochure on it.

(https://i.postimg.cc/pT4Fn2mm/brochure-page1.jpg)


(https://i.postimg.cc/QtH7tBdL/brochure-page2.jpg)

Quote
... just shooting the breeze, don't want to keep you from your "busy, busy" stuff.

No issues at all. I need to get these systems into the designs of nature (green) based households and small communities for provision of working sewerage systems that provide clean sanitation and in turn results in free energy to cook with in the households. Add to this the communal cattle manure and you have so much energy it is actually a problem for the coal connected politicians. Been there, done all the proposals and was met with big thanks and support from the clan chiefs, but each time the mayors cancelled the project ...

Same with the water purification and greywater systems. These are simple to build and operated and proven to be highly effective. The design in this thread is the most complicated and parts of it can be pulled out and deployed in the communities.

Here is a typical community layout we did for a village in the Eastern Cape, where sewerage, rainwater and greywater etc goes to a central hub which forms a community building and from there it distributes back via the spokes to the households on the rim of the wagon wheel layout.

(https://i.postimg.cc/c4NKqkwG/township-layout-with-hubs-perspective.png)


(https://i.postimg.cc/zXSyqwFb/typical-hub-layout-prespective.png)


(https://i.postimg.cc/6pMTv9SB/typical-hub-layout-section.png)



This tech meets with the cultural needs of such a clan and in turn solves all health, medical and social requirements.

By the way the green houses are built from rammed earth and include cooling and heating system using no electricity for cooling and heating. Based on the green houses in China. Status - Fully designed based on proven Chinese designs.
Title: Re: Water purification system for household
Post by: mygoggie on May 24, 2020, 09:43:13 AM
I took some time off from my Colchester Student restoration project which you can follow here (https://www.avforums.co.za/index.php/topic,86628.msg989015.html#msg989015) or a copy that is drifting in its own stream here (https://www.4x4community.co.za/forum/showthread.php/330200-1953-Colchester-Student-Mk1-6-quot-gap-bed-A-restoration-project).

I need to get the front support on the sand filter as I cannot start filling with the filter unless I can support the plexiglass front. I had the plywood cut a while back, but a very itchy plant made me postpone the installation thereof time and time again. I have to work below it and around it to get all the pieces measured, cut and assembled.

(https://i.postimg.cc/xdwf5hWw/IMG-20200329-111623.jpg)




Yesterday I decided I needed some sunshine and decided to tackle the plant and then the supporting frame. I spent about 30 minutes pulling all the dead leaves and cutting the rest from the plant.

The first step was to get all the tools I thought I would need assembled at the working site. Alas, I had to walk a dozen and ten times back and forth for more and more tools.

(https://i.postimg.cc/Prdw7wyT/IMG_20200523_105023.jpg)



Next step was to strip the corner's cover planking off and cut the wooden planks and boards to install the connecting plywood pieces.

(https://i.postimg.cc/bwBSdFhw/IMG-20200523-105031.jpg)




It does not look like much but that was two hours of work to get this board installed!

(https://i.postimg.cc/xdNJmyfy/IMG_20200523_114627.jpg)




Another two hours later and all the connecting boards installed and screwed down.

(https://i.postimg.cc/FsGLXHCc/IMG-20200523-122920.jpg)



The first test fit of the frame components.

(https://i.postimg.cc/C1yZsBdy/IMG-20200523-122929.jpg)



Then it was time for lunch and a 40 winks afternoon rest. The rest of the afternoon was spent cutting and fitting the complete frame. Then installing screws to hold the whole frame together so that I can remove it and fibreglass it as a unit.

All done and ready for the fibreglass.

(https://i.postimg.cc/0yQJk1h4/IMG_20200523_152550.jpg)
Title: Re: Water purification system for household
Post by: Curlycat on May 24, 2020, 12:32:50 PM
I really enjoy following this thread and watching the system develop.
Thank you for posting this Herman.  :thumbs:
Title: Re: Water purification system for household
Post by: mygoggie on May 24, 2020, 03:28:55 PM
I really enjoy following this thread and watching the system develop.
Thank you for posting this Herman.  :thumbs:

Thanks for the motivation @Curlycat .  :dop:
Title: Re: Water purification system for household
Post by: mygoggie on May 24, 2020, 04:00:24 PM
After doing our round of forced exercise on the holy Sunday, the Boss and I had a quick breakfast. No time for sleeping late on a Sunday with Big Pappa dictating when the dogs may walk ...  :whip:

Onto fibreglassing the wooden frame.  First step was to set the frame up so that I can get to most of the areas for the first part of fibreglass work. There is no need to rush work on a complex surface such as this. Take your time. Tomorrow is another day. Bring it on Don Carlos (https://youtu.be/YhPi1ktG19s)

Next step was cutting all the reinforcing. I use standard waterproofing material. I find this does use more resin, but the ease of working with this material on complex multi-surfaces outweighs the cost of more resin.

Here are the various lengths cut and waiting to be trimmed and the angle cuts made.

(https://i.postimg.cc/kXsQccxx/IMG-20200524-102430.jpg)

(https://i.postimg.cc/3JFBq7H0/IMG-20200524-104138.jpg)



Yes, as always I work under a tree where it is cool and good ventilation exists. Nothing like happy chirping bird song motivating you!

Onto cutting the openings and angles.

(https://i.postimg.cc/JzdbwzY0/IMG-20200524-104314.jpg)

(https://i.postimg.cc/ZqCx0dv6/IMG-20200524-110602.jpg)



Always fold the sheets and weigh them down because when the wind blows here, your resin soaked hands will not be able to pick up the scattered sheets. Short vertical runs cut to correct width and the angle joining section cut.

(https://i.postimg.cc/Y0f1TNTB/IMG-20200524-110556.jpg)



And the longer vertical runs done as well.

(https://i.postimg.cc/ZqCx0dv6/IMG-20200524-110602.jpg)



And then it was time to don my PPE equipment. Not for Antie Corona but for resin. I always wear long red rubber gloves, a full cartridge filtered mask (which is rated to protect me for biological warfare while I am fibreglassing) and eye protection. Nothing more dangerous that resin in your eyes and fumes in your sinuses.

And everything ready to start the horistontal slats.

(https://i.postimg.cc/d0pmCVGp/IMG-20200524-111107.jpg)



Horisontal and short vertical slats and the central long vertical slat done.

(https://i.postimg.cc/5yMBPK7m/IMG-20200524-130943.jpg)



And it was time for lunch. Time to wash the brush and the spiky roller. Washing alone takes at least 30 min so best is to sit down, think about the good things in live and enjoy the trees, the birds and the sound of crashing waves will cleaning.

And there we are. All done for the day. Tomorrow is another day ... OK, for those of who do not love reggae music here you go ... bring it on The Wailers (https://youtu.be/FUVLZtJuibU).

(https://i.postimg.cc/xjKykY8p/IMG-20200524-131105.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on May 25, 2020, 05:35:59 PM
This morning I had a lot of admin to do so I had a late start on the second stage of the fibreglass work.

First I completed the four remaining longer vertical ribs. This took just over an hour excluding cleaning. I did not want to clean, but a late lunch was ready ... :thumbs:

(https://i.postimg.cc/RVhvXZBF/IMG-20200525-132424.jpg)



After lunch I had to do some more desk work and by the time I was finished, the wind was blowing at gale force levels. Must have been close to 50 knots. I had to complete the other sides of the ribs as rain is forecasted for tomorrow and the rest of the week I am tied up with the lathe project. Oh well, let's tackle this head on and start sanding the areas clean from the runs and drips of yesterday's work. Out came the flap disk and fortunately the wind blew most of the sanding dust away so that I did not itch at all. Of course eye protection and the biological warfare rated mask was non-negotiable.

Sanded and ready for the new layers of cloth and fibreglass resin.

(https://i.postimg.cc/QdWhZYVZ/IMG-20200525-150923.jpg)



After two hours and frozen almost stiff due to the wind chill factor, I was done. A few leaves and peppercorns from the tree found their way into the resin layer, but I will sand that out.

(https://i.postimg.cc/wTrgPYqk/IMG-20200525-165521.jpg)

(https://i.postimg.cc/Kvkd1kbn/IMG-20200525-165529.jpg)



The edges where no cloth is installed will be covered by a thick layer of felt as these press against the plexiglass and I want to ensure a more or less even distribution of forces. No high spots are wanted as these will create pressure points in the glass and could result in it failing.

Tomorrow, I will see if I can find an hour to sand all smooth and give it a coat of white epoxy.

Title: Re: Water purification system for household
Post by: mygoggie on June 02, 2020, 08:13:03 PM
Well the tomorrow became a few days due to the lovely rain we had.

I had to let the frame dry out again and sanded it today. It actually was more than one hour! Time flies when your hands are busy. It was quite a lot of work cutting all the gaps in, the protruding pieces of fibreglass back, trimming the edges and removing the resin drips and runs.

Outside face done.

(https://i.postimg.cc/bvLp7mfp/IMG-20200602-103846.jpg)




Plexiglass face done. Can you spot my mistake?

(https://i.postimg.cc/633ttCBR/IMG-20200602-111426.jpg)



Tomorrow it is onto giving it a coat of white. Let's hope the weather holds!
Title: Re: Water purification system for household
Post by: mygoggie on June 06, 2020, 09:17:21 PM
Well tomorrow came and went between the lathe restoration projects and normal household maintenance tasks.

This morning I did a test fit of the frame. I had to do quite a few trimmings of cutouts to make the frame fit. Finally I could fit the frame as designed with a bit of pressure on the plexiglas.

(https://i.postimg.cc/YSRv4ppJ/IMG-20200606-100352.jpg)



I then removed it and prepared it for the final white resin coating. That I will do tomorrow morning.

(https://i.postimg.cc/JnhGZ90t/IMG-20200606-115009.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on June 10, 2020, 08:37:39 PM
I spent Sunday morning painting the new frame with white epoxy resin. It took a lot longer than I expected. Tomorrow I will glue the felt on and then install it.

(https://i.postimg.cc/6pPJDX3d/IMG-20200607-115746.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on June 14, 2020, 03:03:21 PM
I have had various requests to get my backside in line and start doing all these projects of mine on video as well.

So please give the poll at the top of this page ^^^ (yes, up there!) a vote so that I can motivate myself!  :whip:
Title: Re: Water purification system for household
Post by: mygoggie on June 14, 2020, 03:24:04 PM
Time to get this frame into shape and into position.

I cut some strips of felt which will be glued to the edge of the frame that press against the plexiglass panel. Yes, I borrowed the Boss' sewing scissors.  :winkwink:

(https://i.postimg.cc/NfjSkG8g/IMG-20200614-105149.jpg)



Next step was to paint (is that the correct word?) contact glue onto the edge and stick the felt onto the edge. Here you can see the LH edge with felt and the next two edges with glue applied.

(https://i.postimg.cc/XJWDGn76/IMG-20200614-110515.jpg)




All edges done!

(https://i.postimg.cc/jSG1Tzp5/IMG-20200614-111814.jpg)




Time to wash the plexiglass clean before installing the frame.

(https://i.postimg.cc/gkt5S943/IMG-20200614-121523.jpg)




Into position the frame goes! I will need to pull it in place with clamps to allow the frame to create inward pressure on the panel. That way I know I will gain very little movement of the panel as outward pressure builts up. Identical as to how a prestressed concrete beam work. You understand?

(https://i.postimg.cc/jSW1B8km/IMG-20200614-121958.jpg)




A nice and tight fit!

(https://i.postimg.cc/XvdzYrWg/IMG-20200614-122013.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on June 16, 2020, 08:35:21 AM
I spent two hours of the morning to install the new frame.

(https://i.postimg.cc/Kvz1fhpP/IMG-20200615-101409.jpg)


Now onto fastening the two weir pipes and the pressure testing of the sandfilter chamber!  :2thumbs:
Title: Re: Water purification system for household
Post by: mygoggie on June 17, 2020, 08:23:28 AM
I am setting up to start the process of video making but I need two microphones. =https://www.avforums.co.za/index.php/topic,87470.0.htmlSee here.

Any help in finding these will be great!  :thumbs:
Title: Re: Water purification system for household
Post by: mygoggie on June 17, 2020, 12:11:53 PM
https://www.avforums.co.za/index.php/topic,87470.0.html

Ai, the linky should be https://www.avforums.co.za/index.php/topic,87470.0.html
Title: Re: Water purification system for household
Post by: mygoggie on June 17, 2020, 12:15:19 PM
I scrubbed the three lid boards with a strong bleach solution and left it to dry overnight.

All ready for action!

(https://i.postimg.cc/hGPjbpW5/IMG-20200617-110035.jpg)



And two layers of resin applied. Now the boards can enjoy a bit of sunshine and get set ...

(https://i.postimg.cc/3wSwLm3J/IMG-20200617-114151.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on June 20, 2020, 09:00:47 AM
The last bit of work on the sand filter's plumbing needed to be addressed.

The two filter chamber outlet weirs were not secured or glued as I still had to make the support batten for the pipe holder.

(https://i.postimg.cc/q7Q6KRR2/IMG-20200619-151227.jpg)




I will follow the same idea I used for the emergency overflow weir as it worked very well and is simple to make. This is what it will look like.

(https://i.postimg.cc/PNGCHv3n/IMG-20200619-151422.jpg)




First step was to measure the distance of the riser pipe's external face to the bulkhead.

(https://i.postimg.cc/JnnD5LDv/IMG-20200619-151311.jpg)




After doing a design drawing and a few basic calculations I had the distances and could move onto cutting the piece of pipe required. As always you do need a whole bunch of tools to make a simple thing.

(https://i.postimg.cc/kGR2Lvyy/IMG-20200619-155119.jpg)




Then it was time to do a dry fit and locate the pipe holder's screw position. Drilling a pilot hole was fairly simple taking care not to drill through the bulkhead! The screw coated with RTV silicone ready for installation.

(https://i.postimg.cc/wvGtWGDv/IMG-20200619-160441.jpg)



And ... there we are, both pipe holders installed. :thumbs:

(https://i.postimg.cc/CLDNqGVD/IMG-20200619-160647.jpg)

(https://i.postimg.cc/c1PhCDP0/IMG-20200619-160643.jpg)



Then it was time for the pipes to be glued in place and pipe holder clips to be installed.

(https://i.postimg.cc/K825r1ZW/IMG-20200619-160816.jpg)

(https://i.postimg.cc/SxffZmRx/IMG-20200619-160824.jpg)



All done and ready for tomorrow's cleaning and filling pressure test. First step will be to clean the chambers from all the debris the wind blew in!

(https://i.postimg.cc/g0cqQ1Lq/IMG-20200619-161401.jpg)

(https://i.postimg.cc/PfCKtG3S/IMG-20200619-151347.jpg)




Onto a successful 0,15 bar pressure test! :dop:
Title: Re: Water purification system for household
Post by: mygoggie on June 20, 2020, 04:03:02 PM
Today is testing day!

The main aim of this test is to check the structural integrity of the whole tank and the specifically the plexiglass front panel. I am not worried about whether the seals are leaking on the plexiglass. I do not want to fix the seals before structural testing as that will mean all the resealing work will be wasted if the plexiglass breaks or cracks under the water pressure.

With that bit of design theory out of the way, it was onto cleaning the three chambers.

(https://i.postimg.cc/t4b8ScYk/IMG-20200620-103935.jpg)

(https://i.postimg.cc/VNLp1b9b/IMG-20200620-103933.jpg)

(https://i.postimg.cc/FHx82xS4/IMG-20200620-103923.jpg)



Good enough for a structural test!  :2thumbs:

Then it was time to start the underground rainwater storage tank's pump and getting water into the sand filter tank. I allowed the hosepipe to discharge into the level sensor chamber to check if both outlet/inlet valve systems work as intended.

(https://i.postimg.cc/wBfPBTF4/IMG-20200620-105043.jpg)

(https://i.postimg.cc/BQHdC3Qt/IMG-20200620-105712.jpg)



The outlet weirs are not leaking. Good news!

(https://i.postimg.cc/vB4KxFNY/IMG-20200620-111130.jpg)




Getting there ...

(https://i.postimg.cc/0QhBpWTp/IMG-20200620-112418.jpg)




And the outlet weirs started discharging! Exactly as designed! :thumbs:

(https://i.postimg.cc/rmRhFGDz/IMG-20200620-112508.jpg)

(https://i.postimg.cc/9FmGLtcT/IMG-20200620-112915.jpg)




Weirs almost submerged ...

(https://i.postimg.cc/66GS9KZz/IMG-20200620-113339.jpg)



And submerged. The level sensor chamber discharges a bit slower on the RH side compared to the LH side. It is minimal so I am not concerned.

(https://i.postimg.cc/LsbCpQ6r/IMG-20200620-114637.jpg)

(https://i.postimg.cc/02YBwCcw/IMG-20200620-114640.jpg)



Checking for leaks ... and the seal is leaking slightly in a few places. Mainly the corners and one place where a screw cracked the plexiglass.

(https://i.postimg.cc/JzRdcB2d/IMG-20200620-114655.jpg)

(https://i.postimg.cc/7P7BFVvW/IMG-20200620-114727.jpg)



At full operating level and onto overflow conditions.

(https://i.postimg.cc/3xL9Xfpd/IMG-20200620-121326.jpg)

(https://i.postimg.cc/rpKjQGCg/IMG-20200620-121342.jpg)



Almost at overflow level. I checked all the outlets and bulkhead fittings and found no leaks. Only the plexiglass seal leaking. Good news!

(https://i.postimg.cc/LXPTMHW1/IMG-20200620-121916.jpg)

(https://i.postimg.cc/kXqykPv2/IMG-20200620-121926.jpg)



And overflowing into the emergency outlet weir. Working as designed!

(https://i.postimg.cc/ZnFxCw4Y/IMG-20200620-122356.jpg)

(https://i.postimg.cc/xT5PQp6t/IMG-20200620-122406.jpg)



I left the tank to stand for a while and one leak sealed under pressure whilst the bottom corners and the crack leaked quite a bit. Now I know where to fix the seals. I tapped around the structure and you could hear it is under pressure, but no high tensile stress sounds ... a few creaks and cracking sounds were made as the tank settled, but those were to be expected.

(https://i.postimg.cc/13zr30TP/IMG-20200620-122526.jpg)

(https://i.postimg.cc/c1MR75G0/IMG-20200620-122720.jpg)

(https://i.postimg.cc/13YcnnhF/IMG-20200620-122854.jpg)

(https://i.postimg.cc/QM2Qm2Mx/IMG-20200620-122901.jpg)



After an hour of standing and no leaks found except on the plexiglass panel, I opened the drain valve to drain the water into the greywater wetland.

Filtered water chamber all drained and cleaned and the two filter chambers water level matching the top level of the outlet weirs.

(https://i.postimg.cc/pTKD6s9Q/IMG-20200620-135821.jpg)

(https://i.postimg.cc/wMHh8DJC/IMG-20200620-135827.jpg)



I am a happy chappy! The design worked as intended and the structure passed the pressure test. Onto fixing the seal and getting the pumps installed on the skid.

I have taken videos as well and will make my first YouTube! video about this test! New exciting times!
Title: Re: Water purification system for household
Post by: Curlycat on June 20, 2020, 04:22:21 PM
Really cool  :2thumbs:
Title: Re: Water purification system for household
Post by: Family_Dog on June 20, 2020, 06:42:39 PM
Was that grey water used for filling and testing purposes?


-F_D
Title: Re: Water purification system for household
Post by: El Sid on June 20, 2020, 08:16:42 PM
Was that grey water used for filling and testing purposes?


-F_D

It looks more of a yellowish colour?
Title: Re: Water purification system for household
Post by: mygoggie on June 20, 2020, 08:54:28 PM
Was that grey water used for filling and testing purposes?


-F_D

No, that was rainwater. It is a natural colour of rainwater ...
Title: Re: Water purification system for household
Post by: Family_Dog on June 20, 2020, 09:10:45 PM
OK, was hoping that it was not tap water, but did not want to mention that directly. It is quite dirty so will be a good test for your purification system.

-F_D
Title: Re: Water purification system for household
Post by: mygoggie on June 20, 2020, 09:16:09 PM
OK, was hoping that it was not tap water, but did not want to mention that directly. It is quite dirty so will be a good test for your purification system.

-F_D

Yep, the colour is from algae growing on everything over here and that needs to be removed. Perfect job for this slow sand filter.

My one issue is that we have severe acid rain as the pH of the rainwater measures between 5.5 and 6.0. The irony is we have no coal power stations or such industries within 1000 km ! I need to run the water through some bicarb to get the pH to 7.0. Another problem for another day.
Title: Re: Water purification system for household
Post by: mygoggie on June 22, 2020, 10:47:45 PM
This morning I assembled the Pajero's last parts after replacing the RH driveshaft outer bearing. I packed all the tools away and cleaned the garage, ready for Carl to continue the Colchester lathe project.

I washed up and then went to look at the sand filter. Low and behold, there is water in the storage chamber!  :facepalm:

(https://i.postimg.cc/L8kC1jFh/IMG-20200622-092810.jpg)



A quick check showed that the water level in the LH sand filter chamber is lower than the water level in the RH chamber. So obviously the through-hole fitting is leaking slowly.

(https://i.postimg.cc/Pqt6zNdy/IMG-20200622-110119.jpg)



So I spent some time bailing the water from the LH chamber to the RH chamber. In the process getting myself a bit wet as well ... ai. Time to tighten the nut and compressing the rubber seal a bit. I think I must have forgotten to tighten the nut before as it turned too easily! Not me, never ever!  :angel:

(https://i.postimg.cc/d1f4YBrN/IMG-20200622-110259.jpg)



Then it was time to start building the filter. I collected some bricks from my storage pile hidden well behind some shrubs. Always on the watch for snakes, but the spiders normally are the ones to draw blood. Cleaned, washed and ready for use.

(https://i.postimg.cc/CxYyXhFB/IMG-20200622-112204.jpg)



The bricks form cavity filters and some space for the collector branches to function.

(https://i.postimg.cc/bdcgGw6Q/IMG-20200622-112816.jpg)



Lower layer of bricks done and onto the covering layer of bricks. These are simply laid flat on top of the bottom layer of bricks.

(https://i.postimg.cc/j2Jvd7hx/IMG-20200622-115047.jpg)



Brickwork done and ready for the crushed stone layers.

(https://i.postimg.cc/8kJVrXK5/IMG-20200622-120059.jpg)



The first 30mm thick layer of 38mm crushed stone layer. I infilled the side cavities with 13mm crushed stone to get a more supportive structure in place.

(https://i.postimg.cc/q7b9N22y/IMG-20200622-120501.jpg)

(https://i.postimg.cc/dVnffGHp/IMG-20200622-120636.jpg)



Onto the 40mm thick layer of 13mm crushed stone.

(https://i.postimg.cc/XNyTvGqB/IMG-20200622-120940.jpg)

(https://i.postimg.cc/GhvwX81n/IMG-20200622-121013.jpg)

(https://i.postimg.cc/g0kCcgLG/IMG-20200622-121103.jpg)

(https://i.postimg.cc/wjVKdCvW/IMG-20200622-121200.jpg)



And then it was time for the sand. I am using sand from the old sand dunes on which my house is built. We had to dig down to more than 5' to get to clean and uniform sand.

(https://i.postimg.cc/pXf4DwD2/IMG-20200622-122442.jpg)

(https://i.postimg.cc/mDPKChSq/IMG-20200622-123115.jpg)

(https://i.postimg.cc/50DT317t/IMG-20200622-134051.jpg)




Hey, bucket why are you standing around and looking busy?? Get the sand in the chamber!

(https://i.postimg.cc/d3dXNXpj/IMG-20200622-134106.jpg)



Looks like it listened!

(https://i.postimg.cc/nLzWfMNz/IMG-20200622-134602.jpg)



And, then it was time to do the "Just add water" step ...  :2thumbs:

(https://i.postimg.cc/hPWNQDQy/IMG-20200622-135412.jpg)



Everything went fine and then the filtered shorted out. The air came bubbling out in the one corner and created a direct path across the filter bed. I will make a video chapter of today and you will see the air bubbling. Here is a screenshot from the video.

(https://i.postimg.cc/44Bhmd0Z/Screenshot-2020-06-22-at-22-38-43.png)



It means I will have to dig out the shorted section and redo the sand layering. Now I know you need to do the crushed stone layers and then add the water to get rid of the air. This way, no air to tunnel through the sand layers and short the filter out! So we learn!

I will keep a close eye on the filter over the next few days and once I am happy with the status of it, I will construct the RH filter.  :dop:

Title: Re: Water purification system for household
Post by: mygoggie on June 25, 2020, 07:27:02 PM
I kept an eye out for anything strange or leaking on the sand filter, but all looks good.  :2thumbs:

The sand subsided under its own weight in the left hand chamber so that is also a good thing. Since nothing problematic was seen, I proceeded to fill the right hand chamber as well.

First it was gathering some bricks and cleaning each.

(https://i.postimg.cc/vB6Y14vz/IMG-20200625-092656.jpg)



Onto cleaning the chamber.

(https://i.postimg.cc/Wbm46JcY/IMG-20200625-092112.jpg)



Then carefully packing the bricks next to the slotted collector pipes. The bricks must not touch the pipes and a 5mm gap is the minimum clearance.

(https://i.postimg.cc/59CyyR7V/IMG-20200625-094418.jpg)

(https://i.postimg.cc/K8Z89vZG/IMG-20200625-094637.jpg)



A rare top view of my feet ...

(https://i.postimg.cc/k5GXm16L/IMG-20200625-094752.jpg)



Cavities around the pipes filled with 13mm crushed stone.

(https://i.postimg.cc/rs1qJ73R/IMG-20200625-095204.jpg)




The first layer of 38mm crushed stone in place.

(https://i.postimg.cc/xdZjTvL8/IMG-20200625-095738.jpg)




And the next layer of 13mm crushed stone in place.

(https://i.postimg.cc/qByB4CqB/IMG-20200625-100030.jpg)




Then, I forgot to add the water step ...

I did it after about 200mm of sand was added and filled the collecter system from the outlet weir side. It worked very well to get the air out and not creating a short in the filter. Once the air was removed, I started adding some more sand, and some more, and so on and so forth. Did I mention I added some more sand to the LH filter chamber again?

Finally, both chambers filled and allowed to settle over the next few days.

(https://i.postimg.cc/T38rhbqk/IMG-20200625-192008.jpg)



Title: Re: Water purification system for household
Post by: mygoggie on July 12, 2020, 09:32:34 PM
The project is on a go slow mainly due to my time spent on the lathe project.

Today I wanted to complete the two weirs so that the outlet height can be adjusted as the sand level changes. The sand is scraped every few months to reduce the thickness of the Schmutzdecke which is the layer where all the biology water purification takes place. This means that for this specific design the sand level will decrease by a total of 400mm over a period of five years where new sand will have to be installed.

My design was to fit another pipe over the two outlet weir pipe as installed before and shown below.

(https://i.postimg.cc/vB4KxFNY/IMG-20200620-111130.jpg)



This however will not work as the pipe clip is in the way. Today I sat down and made two pipes with O-ring seals that can slide inside the weir pipe and stopped from dropping down into the weir pipe by a cap screw.

(https://i.postimg.cc/d03mKVbG/IMG-20200712-120336.jpg)

(https://i.postimg.cc/Qd0kPTyX/IMG-20200712-120330.jpg)



It was when I tested the lengths that my professor's voice spoke loud and clearly in my head. "Never ever create dead spaces when designing water purification or biological reticulation systems."   Oh,  :facepalm:  I just did.  :wallbreak:

What this means is do not create places where flow will not occur. This will create areas where bacteria and all those hairy monsters that hide in the dark corners will grow. I just created such a space between the inner diameter of the larger pipe and the outer diameter of the smaller pipe.

I have spent the rest of the day waiting for Brain to come up with a solution ..  :thinking:

Alas, I think Brain needs some coffee or a good night's rest to present his usual brilliant plans.

So ...  :coffee:
Title: Re: Water purification system for household
Post by: mygoggie on July 19, 2020, 08:00:39 PM
A wonderful sunny day it was today and for that reason I decided to skip garage working and spend time catching some D's.

I wanted to finish the wood paneling that surrounds the sand filter for a while, so this became the item on the looooong list to tick off.

First off was a missing horisontal plank on the back of the screen paneling. I have cut the plank to length a while back, but never installed it. Planing the tongue off was a quick job. I love wood shavings!

(https://i.postimg.cc/L5b41sht/IMG-20200719-105938.jpg)



Due to different wood densities, a joint will always move so a butt joint will maybe be closed now, but in a months time will be open due to contraction of the wood. The best way to hide the joint is to make a 45 slip joint. I therefore cut the existing plank's end to 45.

(https://i.postimg.cc/rpkVW3yP/IMG-20200719-110553.jpg)



The new plank fits well enough for its purpose. I am not making a fancy piece of furniture here!

(https://i.postimg.cc/3rSx6t9k/IMG-20200719-111028.jpg)



Ready for countersinking and then drilling the holes. Yes, this is the correct order to get a neat countersunk hole.

(https://i.postimg.cc/jdDSrykZ/IMG-20200719-111032.jpg)

(https://i.postimg.cc/MpRZnqwB/IMG-20200719-111114.jpg)



All side paneling installed and varnished. I am satisfied that it looks good and will survive our gale force winds!

(https://i.postimg.cc/c4P416pZ/IMG-20200719-132225.jpg)

(https://i.postimg.cc/C1Mwr8qC/IMG-20200719-132316.jpg)



Where the one outlet weir pipe was leaking before, the tightening of the bulkhead fitting proved to be effective. However I noticed a small puddle of water on the floor ... a minute hole was leaking from the right hand sand filter chamber. I am not going to worry about this as it is so small that it will have no effect on the function of the filter.

(https://i.postimg.cc/W4w278hb/IMG-20200719-132740.jpg)



Tomorrow I want to cut the existing plexiglass seal out and let the space dry out. Then hopefully I can install the new sealant the next day when the opening is dry.

I have also figured out how the weir height can be adjusted. I am simply going to make four different lengths of pipes for each weir and use these as required to get an effective outflow from the weir.


Title: Re: Water purification system for household
Post by: seanjammy on July 20, 2020, 08:33:38 PM
Your level of productivity is quite a thing to behold. Amazing to see the thing come together.

Sent from my SM-G988B using Tapatalk

Title: Re: Water purification system for household
Post by: kenvanraas on July 20, 2020, 09:32:25 PM
Stunning and riveting stuff  mygoggie
Your journey is very cool.
(I know about the winds there.Worked @ Deal Party,dollosse i caught a huge leerie on livebait  :dance:)
Kings beach good beyond cool
Title: Re: Water purification system for household
Post by: mygoggie on July 20, 2020, 11:01:31 PM
Thanks guys. Slowly but surely we will get there!
Title: Re: Water purification system for household
Post by: mygoggie on July 26, 2020, 04:22:28 PM
A week has passed with me working on the lathe restoration project (https://www.avforums.co.za/index.php/topic,86628.165.html). It however gave me some time to find a solution to the stagnant water problem in the weir outlet system.

(https://i.postimg.cc/Dyy3bMrP/IMG-20200721-161410.jpg)



Staring at the above picture for about 30 minutes gave Brain some time to work. And the solution was fairly simple. Drill a few holes in the reducing socket's chamfered section. This will allow the water to flow from the bottom of the standing pipe, in between the two pipes and out the tiny holes. The volume flowing through these holes will be minute and will not effect the weir's outlet height and related flow.

The first step was to find a method to drill the holes at equal distances. The easiest way for me is to make some mathematical calculations.

(https://i.postimg.cc/WzmpbqPp/IMG-20200726-120607.jpg)




Basically, measure the diameter, calculate the circumference and divide this length into equal sectional lengths. In this case I thought four holes will do the required and I did the calculation from this basis. I then measured and marked these lengths onto a piece of masking tape. The tape was then stuck to the outside face of the reducer.

(https://i.postimg.cc/W3kbCfWk/IMG-20200726-120623.jpg)



Drilling and countersinking the holes was then a simple process. Just drill at the location of each line!

(https://i.postimg.cc/bvdvHv1L/IMG-20200726-120634.jpg)

(https://i.postimg.cc/d3ctYmpS/IMG-20200726-120638.jpg)




And there was light!

(https://i.postimg.cc/8kLzb9r8/IMG-20200726-120719.jpg)



The second reducer's holes went quicker. Why does the first try always take so long? I pulled the masking tape from the first reducer and simply rolled it onto the second reducer.

(https://i.postimg.cc/YqkqDR1v/IMG-20200726-121040.jpg)

(https://i.postimg.cc/QMW3dKQL/IMG-20200726-121240.jpg)




Staring down the barrel ..  :sweat:

(https://i.postimg.cc/t44Rpgvy/IMG-20200726-121538.jpg)



Next step was to grind away the lip that prevents the smaller 40mm diameter pipe from sliding through the reducer.

(https://i.postimg.cc/htZDjqNm/IMG-20200726-121600.jpg)



Two reducers with two pipes sliding through with a fairly tight fit. Oh yeah, and with holes.

(https://i.postimg.cc/Dzt7rPvy/IMG-20200726-121959.jpg)

(https://i.postimg.cc/WzVjKpqB/IMG-20200726-121936.jpg)




Next step was to glue the reducers to the standing 50mm pipes.

(https://i.postimg.cc/xTtYx2fZ/IMG-20200726-122436.jpg)

(https://i.postimg.cc/brR8jXQs/IMG-20200726-122442.jpg)

(https://i.postimg.cc/zDwqhh98/IMG-20200726-122453.jpg)

(https://i.postimg.cc/BQq4B60D/IMG-20200726-122501.jpg)



Finally pushing the smaller 40mm pipes into the reducer pieces revealed that the idea will work!

(https://i.postimg.cc/MpHwgFXp/IMG-20200726-122925.jpg)

(https://i.postimg.cc/3xqhhFDC/IMG-20200726-122930.jpg)



Notice the water jets from the holes as the pipe displaces some water! I am happy!

(https://i.postimg.cc/9MbV65Pz/water-spitting-from-riser.png)



 :coffee:


Title: Re: Water purification system for household
Post by: mygoggie on August 23, 2020, 03:59:39 PM
The weather this weekend was perfect for some resealing work on the sand filter.

I have been dreading this job for a while. For no reason other than not knowing what sealant to use to seal the leaking joint of the polycarb window and the pool coat inner surfaces of the filter. Polycarb is known for the fact that not any sealant will stick to it. Evident in this case as well with the various layers of silicone and Sikaflex I found applied.

I hunted around for a while on the internet and gave up and drove to a specialist shop in town. It took some digging by the lady behind the counter but after a few five minute periods she showed me on the product range and specification sheet that this will work.

(https://i.postimg.cc/tJMbcJxy/IMG-20200823-122043.jpg)




What is nice about this sealant is that it will bond to wet and humid surfaces. Precisely what is found in the sand filter.

The first step was to clean the chamber of debris and rainwater.

(https://i.postimg.cc/qqkgrNq3/IMG-20200822-084757.jpg)




Then I used the Fein oscillating tool to cut a slot about 10mm from the polycarb. Not easy as I could not fit the tool between the glass and the overflow pipe.

(https://i.postimg.cc/13gXyhmJ/IMG-20200822-113014.jpg)

(https://i.postimg.cc/rFZz6FkD/IMG-20200822-113017.jpg)




The other end was easy and went a lot quicker.

(https://i.postimg.cc/vmfm6r6n/IMG-20200822-113025.jpg)

(https://i.postimg.cc/TYs277Vm/IMG-20200822-113716.jpg)

(https://i.postimg.cc/5y79MpDh/IMG-20200822-113721.jpg)




Next step was to remove the wood with a wood chisel to create the slot.

(https://i.postimg.cc/j5TS6DzF/IMG-20200822-120016.jpg)

(https://i.postimg.cc/4yN4Mj2v/IMG-20200822-120020.jpg)

(https://i.postimg.cc/Dy0yckXn/IMG-20200822-155037.jpg)

(https://i.postimg.cc/bJRNmqgN/IMG-20200822-155041.jpg)

(https://i.postimg.cc/WpX1rbt5/IMG-20200822-155053.jpg)



With the debris removed and the slot cleaned out, it was time to let it dry out over night. It was soaking wet with water running from the wood. Not good!

This morning I swept and vacuumed the chamber clean.

(https://i.postimg.cc/RFvv6jmr/IMG-20200823-112802.jpg)

(https://i.postimg.cc/76XwgmP5/IMG-20200823-114243.jpg)



I then sanded the exposed and adjoining surfaces to the slot with 36 grit sandpaper to get a course surface for the new sealant to grip on. In the process I also managed to remove all the remnants of the old sealants. On completion I once again I vacuumed the slot.

(https://i.postimg.cc/9Qqmvdbk/IMG-20200823-114247.jpg)

(https://i.postimg.cc/HLDYHrPk/IMG-20200823-114253.jpg)



Next step was to clean the surfaces and the slot with a rag and thinners. I took my time and made sure every contact surface was squeaky clean.

(https://i.postimg.cc/KjzFQB4J/IMG-20200823-114533.jpg)



Two tubes of sealant and a spit coated finger later, the new seal is installed! Why do the instructions never say use spit on your finger to smooth the surface? Always a special product name or soapy water ...  :nutter:

(https://i.postimg.cc/zDtqvtPM/IMG-20200823-122053.jpg)

(https://i.postimg.cc/dtgvm7Fj/IMG-20200823-122057.jpg)



And there we are. A total of seven hours later, the new seal is installed!

(https://i.postimg.cc/m2PBHYvr/IMG-20200823-122227.jpg)



 :coffee: :2thumbs:
Title: Re: Water purification system for household
Post by: mygoggie on August 29, 2020, 09:15:31 PM
The new seal had a week to sit and cure. It was time to test the whole configuration and function of the sand filter.

The first step was to remove some sand from the filter chambers to create a bit of space for a water head. I have no idea what will work, so I simply removed a bucket of sand from each chamber.

(https://i.postimg.cc/SN6DFBw8/IMG-20200829-090744.jpg)

(https://i.postimg.cc/yxFXKRrB/IMG-20200829-091211.jpg)

(https://i.postimg.cc/PrjQ46Pq/IMG-20200829-091845.jpg)

(https://i.postimg.cc/1R6KDxRT/IMG-20200829-092516.jpg)



Then it was time to get some water into the filters. I wanted to test the inlet system, so I stuck a hosepipe feeding water from the underground tank into the sand filter supply line.  I did not have any old tubes laying around, so Brain came up with the idea to make a bandage from a strip of linen.

(https://i.postimg.cc/J0WZpn7F/IMG-20200829-103353.jpg)



Water slowly trickled from the manifold as I envisaged it should! Good!

(https://i.postimg.cc/vmNvtbVR/IMG-20200829-094621.jpg)



I also adjusted the outlet weir heights to an arbitrary 50mm below the sand's surface level. Yeah, you can work out the sand's level!  :winkwink:

(https://i.postimg.cc/dVJnqWYf/IMG-20200829-094642.jpg)



And there she blows!

(https://i.postimg.cc/Bv6gFXtc/IMG-20200829-095106.jpg)



Slowly filling ...

(https://i.postimg.cc/P5KyNmf5/IMG-20200829-095101.jpg)




When it the water level reached the drain's opening I tested the new drain outlet I also installed last week.

(https://i.postimg.cc/VvyB2ggD/IMG-20200829-100354.jpg)



First step was to open the hatch and the open the drain valve.

(https://i.postimg.cc/RhQfyBNZ/IMG-20200829-100855.jpg)



And the water started gurgling through the outlet section into the wetland. Working as designed. Jolly good old chap, even if I say so myself!

(https://i.postimg.cc/13Rcxf0h/IMG-20200829-100858.jpg)

(https://i.postimg.cc/DzHqb69n/IMG-20200829-100902.jpg)

(https://i.postimg.cc/jS86RtvW/IMG-20200829-100906.jpg)




Then it was filling the sand filter head sections and wait until the water filters into the storage chamber. Each time the head space was filled I had to switch the pump off and wait for the water to drain into the storage chamber. The reason I had to do this? I simply cannot find the level switch I safely packed away for the big move to New Zealand. I have no idea where it is!

(https://i.postimg.cc/jqzzLzZY/IMG-20200829-103416.jpg)

(https://i.postimg.cc/25VQ6MX0/IMG-20200829-103412.jpg)

(https://i.postimg.cc/Qxm1qh26/IMG-20200829-104929.jpg)

(https://i.postimg.cc/HxMb05m5/IMG-20200829-103528.jpg)

(https://i.postimg.cc/jdtyNLFw/IMG-20200829-104933.jpg)



And so it proceeded until sunset. I called it a day at this level.

(https://i.postimg.cc/L8sfCGRm/IMG-20200829-175721.jpg)




No leaks from the new seal and the sand in the chambers have settled by about 20mm which creates a bit larger head area.

Tomorrow I will repeat the process again until the storage chamber is at designed level. Have a fun and restful Sunday!

 :coffee:

Title: Re: Water purification system for household
Post by: FranZAR on August 30, 2020, 09:55:15 AM
Well done. This was a very interesting project to follow.

Sent from my SM-G988B using Tapatalk

Title: Re: Water purification system for household
Post by: mygoggie on August 30, 2020, 11:33:05 AM
Well done. This was a very interesting project to follow.

Sent from my SM-G988B using Tapatalk

Still lots to come!  :Whoohoo:
Title: Re: Water purification system for household
Post by: mygoggie on September 06, 2020, 03:06:37 PM
Part of the water purification system is a cheap solar heater I designed and built. Basically it consists of a collector made from 200 cooldrink bottles, PEX pipe, 12VDC pump and a PV panel. The idea is to get hot water into a home for less than R1000. Well this fourth revision has been working for four years without any maintenance.

The panel before installation on the roof.

(https://i.postimg.cc/g2GMLqxL/IMG-20141217-100447.jpg)




Just to show the temperature inside each little greenhouse.

(https://i.postimg.cc/L6KQ2MRT/IMG-20141217-100509.jpg)





One problem I found was that the non-return valve I installed to prevent hot water siphoning from the geyser back to the panel at night is not working. A lot of reading later I decided to install the most simple solution of all. An anti-siphoning loop. This works due to the hot water cooling in the loop and then cannot rise out of the loop under thermal convection.

Today was the day to get this little item ticked off from my to do list. The main reason was that I want to install the water purification system's control panel and part of the panel is the solar heater control unit. It is of no use to control and optimise a system loosing heat when the collector works as a radiator under back siphoning conditions.

Let's get onto fixing this problem then!  :thumbs:

Here is the existing non-return valve that is not working as required.

(https://i.postimg.cc/g0dgRyr6/IMG-20200906-110233.jpg)



With the pipe feeding from the solar heater to the geyser when the pump is operating.

(https://i.postimg.cc/qq9L7y9q/IMG-20200906-114924.jpg)




Out came the roll of 13mm PEX pipe which will replace the existing black pipe and will be used to form the new circuit with the ant-siphoning loop.

(https://i.postimg.cc/pXFC6cFF/IMG-20200906-114930.jpg)




PEX does not simply connect to copper. You have to use some form of conversion. Scratching in my plumbing box of spares I could make up two of these adaptor systems.

(https://i.postimg.cc/LsTNVqZQ/IMG-20200906-115120.jpg)




The loop formed and then as installed.

(https://i.postimg.cc/dQXnncLF/IMG-20200906-115803.jpg)

(https://i.postimg.cc/Kzpfddfn/IMG-20200906-123746.jpg)



And the other end of the new pipe connected to the heater panel.

(https://i.postimg.cc/85zwX1Rp/IMG-20200906-123806.jpg)



Now onto getting the control panel installed!  :2thumbs:

Title: Re: Water purification system for household
Post by: mygoggie on September 07, 2020, 09:31:27 AM
I monitored the new abti-siphon loop last night and found that I made a mistake! I tied the loop together at the top and this created a heat transfer bridge. So the water on the hot side heated the water on the cold side and nullified the cooling effect of the loop.

I therefore installed three spacers creating a space between the pipes and now it works!  :2thumbs:

(https://i.postimg.cc/t48Fdxyy/IMG-20200907-071002.jpg)
Title: Re: Water purification system for household
Post by: mygoggie on September 07, 2020, 04:30:23 PM
Two weeks since I filled the filter and a small leak developed at the bottom of the plexiglass. On the RH side of this photo as indicated by the arrow.

(https://i.postimg.cc/0js7hMym/IMG-20200906-124212-water-leak.jpg)



Closer inspection showed that the plywood has delaminated and somehow the water is getting through the pool coat. I will see if I can replace the delaminated piece of plywood in some way and put a new coat of pool coat on the inside of the chamber.

So first step was to drain the chamber and clean it.

(https://i.postimg.cc/YS0RxWvC/IMG-20200907-131907.jpg)



I also calculated the sand level and asked my garden engineer to remove sand to this level. I will make the sand surface level once I have some water in the filter chambers and can use the water as a leveling reference.

(https://i.postimg.cc/N0n4CjX7/IMG-20200907-131905.jpg)




I have been hunting for the missing float level switch for the past two days. It is somewhere safe ...

A peep into the cavity where it will pass through to be installed in the small control chamber. That is the RH filter chamber's isolation valve as installed in the inlet line.

(https://i.postimg.cc/bJ2R7fHX/IMG-20200907-114145.jpg)




I really really hope to find the level switch quickly!  :pray:
Title: Re: Water purification system for household
Post by: mygoggie on January 09, 2021, 04:14:55 PM
It has been a few full moons and dark moons since I last worked on the filter. Most of my spare time was spent on the Colchester lathe project and getting my Pajero restored.

Yesterday I asked the garden Engineer to empty the one filter chamber so that I could try and determine where the origin of the leak is that appears at the front of the plexiglass.

He spent most of the day getting the sand out. Who can ever imagine that so much sand goes into the filter!

(https://i.postimg.cc/qvDnJRKK/IMG-20210109-143047.jpg)



The filtered water chamber still looking good after standing with water for a few months.

(https://i.postimg.cc/MGX7VRwt/IMG-20210109-143058.jpg)




The sand filter chamber not looking too good!  :facepalm:

Why is the pool coat pink?

(https://i.postimg.cc/CxhHMX63/IMG-20210109-143109.jpg)

(https://i.postimg.cc/tCtNjpDd/IMG-20210109-143113.jpg)




I took some Jik and soap as started scrubbing the chamber. Mainly to get it clean, get any algae off and to see what is to be seen.

(https://i.postimg.cc/4yRVDS9F/IMG-20210109-143645.jpg)




And then I saw what I did not want to see ....

(https://i.postimg.cc/zX1F6VwX/IMG-20210109-143651.jpg)




Delaminated pool coat. :Ooooooh: :Ooooooh:

(https://i.postimg.cc/zX1F6VwX/IMG-20210109-143651.jpg)




I got the scrapers out and started scrapping the chamber. Only the sides with original pool coat on was delaminating in specific patches. As I removed the loose layer a weird smell eminated. I also noticed that someone did not sand the original surface very well. I wonder who that could be???

(https://i.postimg.cc/xCzLF2cz/IMG-20210109-145330.jpg)

(https://i.postimg.cc/XN9wfnMM/IMG-20210109-145335.jpg)




Tomorrow I will have to dress up like a spaceman and sand the sides again. I think the filter might have moved, swollen as well as some osmosis might have occurred. I will see tomorrow what is what after I have sanded the sides. I must be honest and say that I am not looking forward to it ...

I also noticed a design fault. There is sand in the filtered water pipes. This means the grading of my filter material is not correct and I will have to install some Bidem between the gravel and the sand layers to ensure the sand does not penetrate into the gravel layers and pipes.

(https://i.postimg.cc/L8xkJDcn/IMG-20210109-144626.jpg)

(https://i.postimg.cc/7LcgV6Y4/IMG-20210109-144638.jpg)



Part of designing a new system is it not? Have fun!  :coffee:




Title: Re: Water purification system for household
Post by: mygoggie on January 10, 2021, 10:41:38 AM
What an utter total $h1t job this is to sand resin in a confined space. First you need to dress up like a spaceman and then while sweating like a horse, try and see through your fogged glasses and safety glasses.

At least Covid taught us how to distinguish shapes through fogged glasses ...  :giggle:

Someone in the past was bright enough to paint something over the fibreglass and pool coat. I then applied my two layers of pool coat onto this existing surface. Somehow the water (I think with osmosis) dislodged this "paint something" from the fibreglass and/or pool coat ...

So ... I had to sand everything down till it was solid resin or pool coat again.

(https://i.postimg.cc/W49fRK0n/IMG-20210110-100836.jpg)

(https://i.postimg.cc/ZR27nd7v/IMG-20210110-100841.jpg)



I will ask the Garden Engineer to clean and do the final sanding tomorrow.

Brain is still trying to figure out the chemical reaction that caused this. Well, good luck to him. I had enough of it to care.  :coffee: