High levels of ammonia nitrogen for biological biogas upgrading |
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| Affiliation: | 1. Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China;2. Faculty of Water Supply and Environmental Engineering, Arba Minch University, P.O. Box 21, Arba Minch, Ethiopia;3. Department of Petroleum & Gas Engineering, Dawood University of Engineering & Technology, New MA Jinnah Road, Karachi, 74800, Pakistan;1. School of Physics and Electronic Engineering, Taishan University, Taian, 271000, PR China;2. School of Physics and Electronic Engineering, Linyi University, Linyi, 276005, PR China;1. Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao, 266580, China;2. School of Geosciences, China University of Petroleum (East China), Qingdao, 266580, China;3. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, China;1. Institute of Atomic and Molecular Physics, Sichuan University, 610065, Chengdu, China;2. College of Physics, Sichuan University, 610065, Chengdu, China;3. Science and Technology on Surface Physics and Chemistry Laboratory, P. O. Box 9071-35, Jiangyou, 621907, China;4. College of Mathematics, Sichuan University, 610065, Chengdu, China;1. School of Environmental Engineering, University of Seoul, Seoul, 02504, Republic of Korea;2. Energy Resource Upcycling Laboratory, Korea Institute of Energy Research, Daejeon, 305-343, Republic of Korea |
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| Abstract: | This study aimed to propose a novel method for ex-situ biogas upgrading by adding ammonium chloride to increase the concentration of ammonia nitrogen. The results showed that ammonia nitrogen had a significant effect on biogas upgrading. The maximum content of CH4 reached 94.1% when the concentration of ammonia nitrogen was 5500 mg/L. At the same time, CH4 yield of increased by 57.5%. High throughput sequencing results showed that the relative abundance of hydrogenotrophic methanogens reached 73.1%, while that of acetotrophic methanogens was only 1.3%, which greatly increased the content and yield of CH4. For the bacterial community, Clostridium was the dominant bacteria and the ammonia nitrogen concentration had little effect on it. These results demonstrate that upgrading biogas by increasing the concentration of ammonia nitrogen is feasible. |
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| Keywords: | Ammonia nitrogen Biogas upgrading Hydrogenotrophic methanogens Microbial community structure |
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