Anaerobic co‐digestion of rice straw and soybean straw to increase biogas production by pretreatment with trichoderma reesei RUT C30

Abstract

This study aim to enhance biogas production for the co‐digestion of rice straw and soybean straw (RSS), pretreatment of fermentation materials by Trichoderma reesei RUT C30 were investigated. The pretreatments were done at 30°C for 72 h, and anaerobic digestion for 5 weeks. The results showed that the cumulative biogas yield from pretreatment co‐digestion group RSS (214.1 NmL/g TSsubstrate) was 318% higher than the untreated group CG RSS (51.2 NmL/g TSsubstrate). The cumulative methane yield from RSS was 94.3 NmL CH4/g TSsubstrate, which was 807% higher than that of untreated group (CG RSS 10.4 NmL CH4/g TSsubstrate), and 90% of potential biogas generation was reached in 17 days, which was 39% shorter than that of pretreatment mono‐digestion groups (28 days). These results suggested that rice and soybean straw co‐digestion exhibits a positive synergistic effect and Trichoderma reesei RUT C30 provides an effective method for improving biogas production. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1050–1057, 2018