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Improving methane yield and quality via co-digestion of cow dung mixed with food waste
Sanjeev Kumar Awasthi1, Rutu Joshi2, Hiya Dhar2
1College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China; Solid and Hazardous Waste Management Division, CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, Maharashtra, India.
Abstract:
Methane (CH4) production and quality were enhanced by the co-digestion of cow dung and food waste (FW) mixed with organic fraction of municipal solid waste (OFMSW) under optimized conditions in bench and semi continuous-scale mode for a period of 30 days. A bacterium capable of high yield of CH4 was enriched and isolated by employing activated sewage sludge as the inoculums. The thirteen bacterial isolates were identified through morphological and biochemical tests. Gas chromatography was used to analyze the chemical compositions of the generated biogas. CH4 yields were significantly higher during co-digestion of Run II (7.59 L) than Run I (3.7 L). Therefore, the co-digestion of FW with OFMSW and Run II was observed to be a competent method for biogas conversion from organic waste resources.
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