CO-DIGESTION OF CATTLE DUNG AND RICE STRAW FOR BIOGAS PRODUCTIONBALA KUMARI, LEELA WATI, AMRITA NARULA AND K.K. KAPOORAbstract Anaerobic digestion of cattle dung supplemented with rice straw in different ratios was carried out at 15-16% total solid concentration in batch and semi-continuous system under laboratory conditions. The maximum biogas production of 28.97 L/kg was observed on supplementation of cattle dung with rice straw at 5% level under batch conditions which was 26.36 L/kg with cattle dung only. Under semi-continuous mode of digestion volumetric productivity of 0.330L/L/day was observed at 5% supplementation of paddy straw to cattle dung which was 0.283 L/L/day for cattle dung only. Methane content in digesters was about 60%. Supplementation of paddy straw to cattle dung also enriched the effluent slurry with nitrogen, phosphorus and potassium.
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