Author Topic: Water purification system for household  (Read 23751 times)

Offline mygoggie

Re: Water purification system for household
« Reply #120 on: July 20, 2020, 11:01:31 PM »
Thanks guys. Slowly but surely we will get there!
Herman

~ To heal the soul is to embark on a new journey. ~

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Offline mygoggie

Re: Water purification system for household
« Reply #121 on: July 26, 2020, 04:22:28 PM »
A week has passed with me working on the lathe restoration project. It however gave me some time to find a solution to the stagnant water problem in the weir outlet system.





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.






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.





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








And there was light!





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.








Staring down the barrel ..  :sweat:





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





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








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











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







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





 :coffee:


Herman

~ To heal the soul is to embark on a new journey. ~

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Offline mygoggie

Re: Water purification system for household
« Reply #122 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.






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.






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.








The other end was easy and went a lot quicker.










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













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.







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.







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.





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:







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





 :coffee: :2thumbs:
Herman

~ To heal the soul is to embark on a new journey. ~

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Offline mygoggie

Re: Water purification system for household
« Reply #123 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 ¾ bucket of sand from each chamber.











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.





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





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:





And there she blows!





Slowly filling ...






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





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





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!










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!













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






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:

Herman

~ To heal the soul is to embark on a new journey. ~

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Online FranZAR

Re: Water purification system for household
« Reply #124 on: August 30, 2020, 09:55:15 AM »
Well done. This was a very interesting project to follow.

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Offline mygoggie

Re: Water purification system for household
« Reply #125 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:
Herman

~ To heal the soul is to embark on a new journey. ~

  mygoggie's perfecture
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Offline mygoggie

Re: Water purification system for household
« Reply #126 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.






Just to show the temperature inside each little greenhouse.







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.





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






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.






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.






The loop formed and then as installed.







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





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

« Last Edit: September 06, 2020, 03:15:26 PM by mygoggie »
Herman

~ To heal the soul is to embark on a new journey. ~

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Offline mygoggie

Re: Water purification system for household
« Reply #127 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:

Herman

~ To heal the soul is to embark on a new journey. ~

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Offline mygoggie

Re: Water purification system for household
« Reply #128 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.





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.





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.






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.






I really really hope to find the level switch quickly!  :pray:
Herman

~ To heal the soul is to embark on a new journey. ~

  mygoggie's perfecture
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