Methane recovery from the anaerobic codigestion of municipal sludge and FOG |
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| Authors: | John C. Kabouris Ulas Tezel Spyros G. Pavlostathis Mike Engelmann James Dulaney Robert A. Gillette Allen C. Todd |
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| Affiliation: | 1. Carollo Engineers, 401 North Cattlemen Road, Sarasota, FL 34232, USA;2. Georgia Institute of Technology, School of Civil and Environmental Engineering, Atlanta, GA 30332-0512, USA;3. Pinellas County Utilities, 14 South Fort Harrison Avenue, Clearwater, FL 33756, USA |
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| Abstract: | The anaerobic biodegradability of a mix of municipal primary sludge (PS), thickened waste activated sludge (TWAS) and fat, oil, and grease (FOG) was assessed using semi-continuous feed, laboratory-scale anaerobic digesters operated at mesophilic (35 °C) and thermophilic (52 °C) temperature. Addition of a large FOG fraction (48% of the total VS load) to a PS + TWAS mix, resulted in 2.95 times larger methane yield, 152 vs. 449 mL methane @ STP/g VS added at 35 °C and 2.6 times larger methane yield, 197 vs. 512 mL methane @ STP/g VS added at 52 °C. The high FOG organic load fraction was not inhibitory to the process. The results of this study demonstrate the benefit of sludge and FOG codigestion. |
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| Keywords: | Anaerobic digestion FOG Lipids Methane production |
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