Production of biogas at mesophilic and thermophilic temperatures
2004
Ali, I. | Ali, M.M. | Basit, M.A. ( PCSIR Labs., Karachi (Pakistan). Fuel Research Centre) | Khan, A.R.
Experiments were accomplished for the production of biogas using a slurry comprising 50% fresh buffalo dung and 50% water at ambient and elevated temperatures. After 2 weeks, observations for the release of biogas were noted. It was observed that with the increase of temperature, the rate of generation of gas was enhanced. A slurry containing 200 g fresh buffalo dung and 200 g water produced 121.5 ml gas/day at an average ambient temperature of 35 degree C, whereas at 45 degree C, 50 degree C, 55 degree C and 60 degree C, the average rates of gas generation were noted as 152.0, 221.5, 292.0 and 354.0 ml/day. The volume of 232.5 ml of biogas in excess was produced with the temperature difference of 25 degree C (60 degree C - 35 degree C). The input of 42000 joules of energy for heating 400 ml of slurry produced gas of 5196.375 joules. It shows that there is a loss of 36803.625 joules of heat which makes the process, thermally, not viable. Hence, ambient temperature is recommended for the production of biogas for domestic plants.
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