by Sam A. Rushing, Advanced Cryogenics, Ltd. | (Jim Lane (The Digest).
In some world markets, biogas is the common source of methane, otherwise thought of as, and called natural gas. Such is used to heat our homes, supply industry with a combustible fuel, and a feedstock agent; and of course a supply of carbon dioxide which is significant in the by-product of digesters. From the digesters, about 60-70% methane, and 30-40% CO2, plus other constituents, like hydrogen sulfide (the foul odor), and trace substances. The products from digesters are all useful, including the solids and liquids which go back to the soil…