RE;Anaerobics feasibility? David asked;
DD> ...is there enough "energy" in animal waste or municipal waste
DD> for that matter, to justify such a plant operation?
"Biogas is about 20 percent lighter than air and has an ignition temperature
in the range of 650 degrees to 750 degrees C. It is an odourless and
colourless gas that burns with clear blue flame similar to that of LPG gas
(Sathianathan, 1975). Its calorific value is 20 Mega Joules (MJ) per m3 and
burns with 60 percent efficiency in a conventional biogas stove."
Later on it suggests approximate outputs of 0.02 to 0.12 cubic metres of gas
per kilo dry mater input of various manures. Inputs can also be plain
vegetable matter for composting. ater hyacinth and crop aste are quoted at
0.037 and 0.45 m^3 per kilo DM.
I recommend the link above for further references, a broad overview of the
biogas priciples, and an outline of the various types of digester.
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