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Anaerobic digestion is a biological process of degradation of the organic substrate in the absence of oxygen. The degradation takes place by bacteria that obtain the oxygen necessary for their vital functions from biomass. At the technological level, there are three categories of anaerobic digestion: Wet digestion characterized by a dry matter content in the digester of about 10% Semi-dry digestion characterized by a dry matter content in the digester of about 25% and at the limit of pumpability Dry digestion characterized by a very high dry matter content