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Anaerobic digestion of municipal wastewat er sludge has been widely practiced since the early 1900s and is the most widely used sludge treatment method. Overall, the process converts about 40% to 60% of the organic solids to methane (CH4) and carbon dioxide (CO2). The chemical composition of the gas is 60-65% methane,
Activated Sludge Process. Activated sludge process requires aeration, which can count up to 75% of wastewater treatment plant (WWTP) energy costs, while the treatment and disposal of sludge may count up to 60% of the total operation cost (Kokabian and Gude, 2015a,b). From: Microbial Electrochemical and Fuel Cells, 2016. Related terms: Energy
