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| Effects of ammonium on methane fermentation of chicken manure under mesophilic and thermophilic conditions |
| QIAO Wei1,2, BI Shao-jie1, XIONG Lin-peng1, JU Xin-xin3, DONG Ren-jie1,2 |
1. R & D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development and Reform Committee, College of Engineering, China Agricultural University, Beijing 100083, China;
2. Institute of Yantai, China Agricultural University, Yantai 264670, China;
3. Shandong Zhongnong Sanyue Environmental Protection Technology Corporation Limited, Yantai 264670, China |
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Abstract In order to explore the effect of total ammonium nitrogen (TAN) on mesophilic and thermophilic anaerobic digestion of chicken manure, the performances of anaerobic digestion of chicken manure under mesophilic and thermophilic conditions were compared through 265 days' experiment with the increased TAN when the feed total solid (TS) increased from 5% to 7.5% and 10%. During the operation, the specific methanogenic activity (SMA) test was carried out with sodium acetate. The TAN in the mesophilic and thermophilic reactors increased from 2.1~2.5to 6.1~6.5g/L when TS increased from 5% to 10%. The SMAs of the mesophilic and thermophilic reactors reduced by 44% and 100%, respectively, resulting in a decrease in the ability of the fermentation system to produce methane by acetic acid. In the mesophilic reactor, the methane yield reduced from 253 to 203 mL/gTS, associated with the accumulation of volatile fatty acids (VFAs) from 0.4 to 7.6g/L. The methane yield decreased from 181to 18mL/gTS when the VFA increased from 0.4 to 26.1g/L in the thermophilic reactor. The effect of TAN on reducing methane yield was more obvious under thermophilic condition.
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Received: 18 December 2018
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