There are other ways to produce biogas with cows. A monastery (Tamié) in savoy has done so for 5 years now.
They, are producing cheese and because of that they end up with a fair quantity of lactoserum. Until 5 years ago, they had to pay to get rid of that lactoserum. That process becoming increasingly expensive they are, now, using it to heat the water for the entire community.
They are extracting methane from the lactoserum (using a process I don't know anything about). Then, they use the methane to heat their water. I thought it could be interesting.
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