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Digested sludge refers to the semi-solid waste material resulting from the municipal wastewater sludge digestion process. This biological process converts organic matter into biogas, water, and solids through anaerobic and aerobic stages. Municipal wastewater includes water from urban and suburban homes or businesses and potentially industrial sources. The digestion process involves different populations of anaerobic microbes thriving at mesophilic (86 - 100 F) and thermophilic (122 - 140 F) temperature ranges. During the thickened activated sludge digestion, heat is produced, and dewatering is employed to remove water from sludge, which can be free or bound to particles.
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