Experimental Study on Mesophilic Biogas Fermentation with Rice Straw Pretreated by Cellulase

This paper reported rice straw pretreated by cellulase can produce methane by anaerobic batch fermentation at 30°C with 6% of TS in 400 ml reactor. The results showed: Group B (time of cellulase treatment for 48 h) got the highest biogas production for 3188 ml, and group C (time of cellulase treatment for 24 h) got the gas production for 2718 ml. Both group B and group C biogas production increased compared with the control group(group A). With a Total Solids ( TS) gas production rate of 352 ml/gTS and 415 ml/gVS for group B, and 330 ml/gTS and 454 ml/gVS for group C, and 284 ml/gTS and 334 ml/gVS for control group. The energy conversion efficiency respectively were 49.96%, 46.40% and 39.90% for B,C and A group. So, pretreatment method B (48 h pretreatment by cellulase) was best for getting high biogas production and higher energy conversion efficiency.