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| Research progress of direct utilization of dissolved methane in anaerobic biological treatment of wastewater |
| XIAN Yun-chuan1,2, SU Cheng-yuan1,2, WANG Zi2, LIU Sheng-tao2, CHEN Zheng-peng2, LIN Xiang-feng2, ZHANG Yun-nan2 |
1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin 541004, China;
2. School of Environment and Resources, Guangxi Normal University, Guilin 541004, China |
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Abstract Mainstream anaerobic wastewater treatment processes often produce dissolved methane (CH4) during operation, which can be released to exacerbate the greenhouse effect and cause energy wastage if not properly treated subsequently. It is important to utilize the dissolved CH4 produced during the anaerobic biological treatment of wastewater. The direct utilization of dissolved CH4, unlike removal and recovery, reduces the process of separating CH4 and has a better potential for net energy production. Generally, dissolved CH4 could be coupled by anaerobic oxidation of CH4 with the reduction of other pollutants in the wastewater, including sulfate, nitrate, and heavy metals; or converted it into proteins, biopolymers, methanol, and organic acids with higher commercial value. This review summarized and discussed the three methods of anaerobic methane oxidation, methane-driven microbial fuel cells, and value-added methane conversion, described their advantages and limitations, and summarized their developmental potential to provide ideas for the future development of the utilization of dissolved CH4 in anaerobic wastewater treatment.
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Received: 12 January 2023
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