Summary
Methane fermentation and working of biogas engine were carried out to develop the local efficacy utilization of livestock waste. During batch fermentation at 35 centigrade, maximum gas production rate was 950 ml/l/d (370 mg/g-vs) and CH4, concentration was 58 - 76 %. In continuous fermentation, the maximum values of gas production rate (840 - 1,150 ml/l/d), CH4, concentration (64 - 72 %) and CODcr removal (61 - 63 %) could be observed when loading of volatile solid was in the range 2.8 to 7.1 g-vs/l/d. Using the mixed gas fuel consist of CH4, and CO2 (CH4, 60 and 80%), a 4 cycle spark ignition engine (550cc) was worked by means of controlling air-fuel ratio. The maximum power performance of 15 PS could be obtained, while the most efficient working was observed at 2,500 rpm (10PS). It was estimated that 13 hr (per day) continuous working might be possible using biogas from 500 pigs.HomePage