期刊
BIORESOURCE TECHNOLOGY
卷 289, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.121639
关键词
Lignocellulose; Biogas yield; Optimization; Metagenome; Metatranscriptome
资金
- University Grants Commission (UGC)
- Council for Scientific and Industrial Research (CSIR), Government of India
Effects of different process and nutritional parameters on microbial community structure and function were investigated to enhance the biomethanation of rice straw without any thermochemical pre-treatment. The study was performed in a mesophilic anaerobic digester with cattle dung slurry as inoculum. The highest methane yield of 274 ml g(-1) volatile solids was obtained from particulate rice straw (1 mm size, 7.5% solids loading rate) at 37 degrees C, pH-7, when supplemented with urea (carbon: nitrogen ratio, 25:1) and zinc as trace element (100 mu M) at 21 days hydraulic retention time. The optimization of conditions selected Clostridium, Bacteroides, and Ruminococcus as dominant hydrolytic bacteria and Methanosarcina as the methanogen. Analysis of metagenome and metatranscriptome revealed wide array of bacterial lignocellulolytic enzymes that efficiently hydrolyzed the rice straw. The methane yield was > 80% of the theoretical yield, making this green process a sustainable choice for efficient extraction of energy from rice straw.
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