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| Effect of operating conditions on the dry anaerobic fermentation of rice straw |
| Received:September 25, 2019 |
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| KeyWord:rice straw;dry anaerobic fermentation;pilot study;continuous feeding |
| Author Name | Affiliation | E-mail | | ZHANG Min | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | WANG Zhen-qi | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | SHEN Gen-xiang | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | QIAN Xiao-yong | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | | | ZHANG Xin-lang | Shanghai Academy of Environmental Sciences, Shanghai 200233, China | zhangxl@saes.sh.cn | | CHEN Jing | Shanghai Environmental Protection(Group) Co. Ltd, Shanghai 200233, China | |
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| Abstract: |
| To investigate biogas production during continuous-feed dry anaerobic rice straw fermentation, the aims of the present study are to investigate the effects of single fermentation of cow manure, feeding method and nitrogen source on biogas production and on technical economic analysis and evaluation. The pilot system could reach uniform mixing of straw materials at a solid content of 20%, thereby achieving continuous fermentation and balanced biogas production. At the beginning of the experiment, the optimal anaerobic microbial system and suitable fermentation temperature for rice straw treatment were available after 29 d of the single fermentation of cow manure. Thus, the continuous feeding phase test could be started quickly. At the continuous-feeding and stable-operation stage, during which 80 kg·d-1 feeding quantity and 4.54 kg·d-1(TS)pig manure were used as supplementary nitrogen sources, the daily biogas CH4 production increased significantly from 137.28 L·kg-1VS to 227.8 L·kg-1VS, and total production could be maintained at 20~22 m3·d-1. For area where pig manure source is scarce, the one-time addition of 68.1 kg(TS)pig manure could be adopted. The regular replenishment period was every 20 d. These results indicate that dry anaerobic rice straw fermentation is feasible and can facilitate continuous-feed and stable-operation biogas production, which will have great application prospects and economic benefits. |
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