Journal
WASTE MANAGEMENT
Volume 31, Issue 8, Pages 1752-1758Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2011.03.025
Keywords
Anaerobic; co-Digestion; Lipids; Waster activated sludge; Micronutrients
Categories
Funding
- Ohio Agricultural Research and Development Center
- quasar energy group
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Co-digestion of thickened waste activated sludge (TWAS) and fat, oil and grease (FOG) was conducted semi-continuously under mesophilic conditions. The results showed that daily methane yield at the steady state was 598 L/kg VS(added) when TWAS and FOG (64% of total VS) were co-digested, which was 137% higher than that obtained from digestion of TWAS alone. The biogas composition was stabilized at a CH(4) and CO(2) content of 66.8% and 29.5%, respectively. Micronutrients added to co-digestion did not improve the biogas production and digestion stabilization. With a higher addition of FOG (74% of total VS), the digester initially failed but was slowly self-recovered; however, the methane yield was only about 50% of a healthy reactor with the same organic loading rate. (C) 2011 Elsevier Ltd. All rights reserved.
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