Evaluation of Biogas Production from Co-Digestion of Cow Dung and Poultry Waste

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Agricultural wastes can be converted to renewable energy through anaerobic digestion. This study evaluated biogas production from co-digesting cow dung and poultry waste. Five mixing ratios were tested: 100:0, 75:25, 50:50, 25:75, and 0:100 (cow dung:poultry waste) in 50-liter digesters at mesophilic temperature (35 degrees Celsius) for 40 days. Results showed that 50:50 mixing ratio produced highest cumulative biogas (48.5 L/kg VS) with 62% methane content. Poultry waste alone had lowest production due to ammonia inhibition. The synergistic effect of co-digestion improved C:N ratio and buffering capacity. Digestate quality was suitable as organic fertilizer with 2.8% N, 1.2% P, and 1.5% K. The study recommends integrated livestock-biogas systems for rural energy and fertilizer production.