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| Research on effect of combination of steam explosion and calcium oxide pretreatment on rice straw solid-state anaerobic digestion |
| Received:October 31, 2016 |
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| KeyWord:steam explosion;calcium oxide;pretreatment;straw;anaerobic digestion;solid-state fermentation;biogas |
| Author Name | Affiliation | E-mail | | WANG Xing | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China | | | LI Qiang | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China
Key Laboratoary of Development and Application of Rural Renewable Energy of Ministry of Agriculture, Chengdu 610041, China | | | ZHOU Zheng | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China
Key Laboratoary of Development and Application of Rural Renewable Energy of Ministry of Agriculture, Chengdu 610041, China | | | HE Jing | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China
Key Laboratoary of Development and Application of Rural Renewable Energy of Ministry of Agriculture, Chengdu 610041, China | | | DENG Ya-yue | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China
Key Laboratoary of Development and Application of Rural Renewable Energy of Ministry of Agriculture, Chengdu 610041, China | | | ZHANG Min | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China
Key Laboratoary of Development and Application of Rural Renewable Energy of Ministry of Agriculture, Chengdu 610041, China | | | YIN Xiao-bo | Biogas Institute of Ministry of Agriculture, Chengdu 610041, China
Key Laboratoary of Development and Application of Rural Renewable Energy of Ministry of Agriculture, Chengdu 610041, China | yinxiaobo@caas.cn |
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| Abstract: |
| In order to enhance the utilization of rice straw,the methods steam explosion(SE), calcium oxide(CaO) and combination of SE/CaO were used to pretreat rice straw,and the characteristic of rice straw and solid-state anaerobic digestion were also investigated. The results showed that the structure of rice straw was destroyed seriously, as while as the lignin content of rice straw decreased from 17.2% to 12.2% and the removal rate of lignin was 29.1% in the condition of SE/CaO pretreatment. The results of cellulose hydrolysis indicated that yield of glucose and xylose which pretreat by SE/CaO were 877.56 mg·L-1 and 400.85 mg·L-1, and were increased by 85.43% and 1 283.39% compared with the untreated samples. The solid-state anaerobic digestion experiment showed that the lag phase of samples pretreat by SE/CaO was 5 days which shorter 6 day than the untreated samples.The cumulative methane production in previous 30 days accounted 86.4% of total cumulative methane production in the condition of SE/CaO pretreatment, and the untreated was only 55.7%. The methane production potential of samples pretreat by SE/CaO was 0.24 L·g-1 VS which was the highest in three pretreatment, and increased 20.2% than the untreated. The fitting results of kinetic model indicated that SE/CaO pretreatment was the more suitable method to pretreat rice straw which compared with SE pretreatment and CaO pretreatment. |
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