Biogas Production from Paddy Straw using Thermophilic Fungi

摘要

The potential of thermophilic fungal pretreatment of paddy straw was investigated by determining the lignolytic enzyme production, changes in chemical composition of paddy straw like cellulose, hemicellulose, lignin and silica contents and biogas production. The fungal isolates namely Aspergillus sp (T), Paecilomyces sp (T) and Penicillium sp (TJ displayed production of lignolytic enzymes viz. laccase and lignin peroxidase. Maximum production of lignolytic enzymes was achieved with isolate T7 and minimum with isolate J_. Cellulose, hemicellulose, lignin and silica contents decreased by 9.6,13.3, 32.6 and 25.0 percent, respectively in paddy straw pretreated with isolate T14. In case of isolate T17 pretreated paddy straw, cellulose, hemicellulose andlignin contents decreased by 17.5, 14.1 and 47.9 percent, respectively but change in silica content was non significant. A reduction of 41.3, 13.7 and 43.5 percent was observed in cellulose, hemicellulose and silica contents in paddy straw pretreated with T_. Paddy straw pretreated with all the isolates (T, T17and TJ showed enhanced biogas production by 37.0,41.6 and 25.2 percent, respectively in comparison to untreated paddy straw containing cattle dung and digested cattle dung slurry.