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Thursday, May 6, 2010

Poo Digester

This is something I have thought about doing, making an anerobic poo digester. Click on the image to see it full size.

This looks fairly simple to make, of course everything has challenges, I think this is doable. Here is the text that goes with the image:

Organic waste is introduced through the screwed filler cap where it is broken down by bacteria in the slurry. Heat is an important factor, the process working best at around 40° C (around 105° F). Locating the Digester tank in a sunny area will supply the necessary heat.
As gas is produced, it is forced through the Scrubber, which helps to remove any sulfur compounds in the gas.
The methane then passes through the cleaner tank, which removes any carbon dioxide from the gas. The gas is under pressure from the header tank.
The header tank ensures that the Cleaner Tank has a good level of water, and also puts the collected gas under pressure. The higher the header tank, the more pressure is produced.
From time to time, (about 6 months) the sludge is removed from the Digester tank. This sludge, and any liquid recuperated, makes a very good, sterile fertilizer. Any pathogens that may have been introduced are killed off at 40°C, the working temperature of the digester.
Link to the original story: http://kcisupport.awardspace.co.uk/Projects/biogas-mk2.htm
Another link about making methane

What do you think?

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  1. I definitely think PB can build this and make it work!
    Go for it. Went to first site and next and next.
    Solar hot water is easiest and least expensive. Biogas almost a tie. Would be great combination. Hot water and gas to cook or heat with.

  2. Hi Wretha,
    We have been doing some research into this area, as some friends of ours who have a farm have installed their own 'poo' digester as you call it. It seems to be working fine, they are using the methane produced to heat their home (about 60%) and cook with, not a real complicated system. They are living off the grid now and hope to expand their setup to completely run their gas needs with poo.
    Nice post by the way.
    Hope all is well with you,
    Les and Jane

  3. I think it's a very workable project and worth the build. Certainly couldn't hurt!

    Thanks for the links!


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