Effect of temperature and stirring on biogas production by anaerobic fermentation with bagasse

In order to find out the optimal temperature of anaerobic biogas fermentation by using bagasse, effects of temperature and stirring on biogas production and degradation of organic matter were experimented in this study. Four temperature levels containing (25±6)°C, (35±1)°C, (45±1)°C, (55±1)°C were selected to be tested by using a designed bech-scale reactor. The results showed that when the same inoculums rate with 30% of effective volume, pH with 7.3±0.2 and carbon nltrogen ratio were adopted, the maximum biogas production of bagasse, approximate 273.01 ml·g^-1, can be obtained at 35°C. In addition, the degradation rate of COD can also reach the maximum at this temperature. Contrarily, highest degradation rates of total solid and Volatile solid can only be reached at 45 °C. Additionally, total methane production can be raised by adding stirring no matter what temperature level was adopted. The result can provide theory evidence and reference for reducing energy consumption and optimizing the biogas ferment process by selecting the lignocelluloses.