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The Mesophilic and Thermophilic Anaerobic Digestion of Municipal Sludge and FOG

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The anaerobic biodegradability 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 and compared to the ultimate degradability obtained from 120-day batch digestion at 35°C. A mix of PS, TWAS and FOG (21/31/48% VS basis) was fed to an acid digester. The acid reactor effluent was fed to two parallel methane phase reactors operated at an HRT of 12 days and maintained at 35°C and 52°C, respectively. The acid-phase reactor achieved a 43% decrease in non-saturated fat and a 16, 26, and 20% increase of soluble COD, volatile fatty acids (VFAs), and ammonia, respectively. The methane-phase VS destruction in Run 2 was 85 and 97% biodegradable VS destruction at 35°C and 52°C, respectively. The methane yield was about 3 times larger compared to the case of digesting sludge without the FOG.

Document Type: Research Article


Publication date: 2008-01-01

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