Abstract
Methane fermentation and working of biogas engine were carried out to develop the local efficacy utilization of livestock waste. During batch fermentation at 35°C, maximum gas production rate was 950ml/l/d (370mg/g-vs) and CH4 concentration was 58-76%. In continuous fermentation, the maximum values of gas production rate (840-1, 150ml/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 7.1g-vs/l/d. Using the mixed gas fuel consist of CH44 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, 500rpm (10 PS). It was estimated that 13hr (per day) continuous working might be possible using biogas from 500 pigs.
