LYCOS RETRIEVER 
Digestion: Anaerobic Digestion
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As with all industrial systems, to be economically viable, there must be a use, market or acceptable disposal point for the outputs of anaerobic digestion. Biogas can be sold or used in almost all parts of the world, where it can offset demand on fossil fuel stocks. Alternatively biogas can be used to provide cheap sources of energy in the developing world and help reduce methane emissions to atmosphere.[38]
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For dairy farmers and others interested in exploring the idea of using anaerobic digestion as a waste control measure, the Northwest CHP Application Center has developed a factsheet to help identify key questions prior to implementing an anaerobic digestion program. This factsheet can be found at the CHP Application Center website.
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In the 1930รข€™s, people began to recognise anaerobic digestion as a science. Research was done that led to the discovery of anaerobic bacteria which in turn led to more research into the required growth conditions for methanogenic bacteria.[8] This work was further developed during World War II where in Germany and France there was an increase in the application of anaerobic digestion for the treatment of manure.
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Anaerobic digestion (AD) is a biological process similar in many ways to composting. It is a natural treatment process and, as in composting, bacteria break down organic matter and reduce its bulk or “mass”.
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Anaerobic Digestion