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Make Your Own Biogas

Nevada ranch owner offers a means to power and heat your home, using biogas gleaned from your animals’ manure.

| October 24, 2008

  • Store manure in a sunroom to reach the proper temperature.
    The filled drums are kept in a sunroom or solar collector to maintain the proper temperature.
    courtesy Jeff Hoard

  • Store manure in a sunroom to reach the proper temperature.

There is a real possibility that many readers of GRIT have the makings of a methane gas supply right in their backyards and could reduce – or eliminate – their household gas bill each month.

Just a couple of horses or cows, a few goats or pigs, or a couple hundred chickens can supply enough manure to make a substantial amount of biogas that can be used anywhere natural gas is used, or propane with a few adjustments.

Biogas, in simple terms, is the methane/carbon dioxide combination (approximately 70 percent methane and 30 percent CO2) made naturally when organic material decays without oxygen and in a temperature of 85 to 105 degrees.

Digesters are used. A continuous load digester is fed a little organic material each day for continuous operation, while a batch load digester is filled all at once and, as production declines, is emptied and refilled. We use a series of 55-gallon drums, and combine the two methods. We dump and refill one drum every couple of weeks for an uninterrupted and continuous supply of gas.

We keep the drums in a simple, south-facing, solar collector to reach and regulate the proper temperature.

To collect the gas, poly tubing is run from each barrel into a main line that runs through two simple PVC manifolds. These have the proper shut-offs and moisture drains. They also have the ability to scrub the gas. From there, the gas is piped and stored in a bank of inner tubes. Yes, regular ol’ inner tubes.

Meisam Ghazi
11/26/2012 5:25:10 AM

hi do you find a DIY plane? please explain it or send me link. tank u

Mark Tanu
11/4/2012 9:04:11 PM

I am a young man from Ghana I want a book on this technology so I could help my community with it

7/21/2012 7:06:02 PM

I am a rural girl who is a South African national. My interest is in making methane from cattle/ chicken and pif manure, but my challenge is that I to know how to construct a simple home DIY digester that I will be able to train my communittie sin making it. Challenges are most people are une,ployed, poor and destitute and electricity is becoming a priviledge to many everyday but most worring is that trees are being destroyed everyday because its the only alternative but in the process nature is being destroyed because they cannot are really struggling to make ends meet.Please help me by giving me a step by step plan of DIY biodigester without using exhorbitant funds that's very difficult to get. Kind Regards Nomvuyiso

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