BALA KUMARI, LEELA WATI, AMRITA NARULA AND K.K. KAPOOR
Abstract
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.