Many years ago Mother Earth News Magazine had several articles about building methane digesters on a much smaller scale, for small farmers and homeowners. I never tried building one, but they looked like a person could produce some methane with relatively little investment.
Methane is produced as manure decomposes and usually it just is lost to the air. The digesters capture the methane before it can mix with the air.
I suspect that the large manure producers are trying to figure out how to deal with the manure in ways that the ecology people consider proper. I also bet they are getting federal subsidies to build the huge digesters--and I bet the break even point would be a lot longer than 10 years without the subsidies.
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Today's Featured Article - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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