Improving biogas production from protein-rich distillery wastewater by decreasing ammonia inhibition |
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Authors: | Xia Jiang Junpei Hayashi Zhao Yong Sun Lu Yang Yue Qin Tang Hiroshi Oshibe Noriko Osaka Kenji Kida |
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Institution: | 1. College of Architecture and Environment, Sichuan University, Chuanda Road, Shuangliu County, Chengdu, Sichuan 610207, PR China;2. Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Kumamoto City, Kumamoto 860-8555, Japan;3. Tokyo Gas Co., Ltd., 1-7-7 Suehiro-cho, Tsurumi-ku, Yokohama City, Kanagawa 230-0045, Japan |
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Abstract: | A large quantity of protein-rich distillery wastewater is produced during the process of bio-ethanol production from kitchen waste. It is difficult, however, to treat protein-rich distillery wastewater by anaerobic digestion due to ammonia inhibition. In this study, a novel method was investigated to reduce ammonia inhibition during thermophilic anaerobic digestion through the recirculation of water-washed biogas into the headspace (R1 system) or liquid phase (R2 system) of the reactors. The results show that the method greatly improved biogas production from distillery wastewater. R2 system achieved stable biogas production at a higher organic loading rate (OLR) of 4.0 g VTS/L/d than R1 system at 3.0 g VTS/L/d. At the same OLR, we observed a higher biogas production rate but lower accumulation of NH4+ and volatile fatty acids in the reactor, and higher ammonia absorption rate in the water tank of R2 system than R1 system. The better performance of R2 system could be attributed to the more efficient removal of ammonia from liquid phase. In addition, adjusting the C/N ratio of distillery wastewater from 9.0 to 11.4 significantly enhanced the maximum OLR from 3.0 to 7.0 g VTS/L/d in R1 system. |
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Keywords: | Anaerobic digestion Distillery wastewater Ammonia inhibition Biogas recirculation Kitchen waste treatment |
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