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Open Access An Evaluation of 3 Stage Anaerobic Digestion of Municipal Wastewater Treatment Plant Sludges

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This study evaluated the efficiency of three stage operation of anaerobic digestion of municipal sewage sludge. Various combinations of conventional (35°C) and non-conventional (42 and 49°C) temperatures were evaluated. Three stage operation was able to achieve enhanced volatile solids reduction as compared to single stage operation. Operation of the first stage at 42°C and 49°C resulted in an 8-12% increase in VS destruction. Stable operation of three stage configurations was indicated by low concentrations of total volatile fatty acids and substantial alkalinity generation. An increase in temperature to 42°C in the second stage of the investigated system showed no significant change in final effluent quality. Three stage operation resulted in a greater reduction of all indicator organisms when the first stage of the 3 stage system was operated at either 42°C or 49°C as compared to operation at 35°C.

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Keywords: ANAEROBIC; BIOGAS; BIOSOLIDS; DIGESTION; PATHOGENS; SLUDGE; VS DESTRUCTION

Document Type: Research Article

Publication date: 2007-04-01

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