| 流场对MEC生物阴极CO2还原性能与产物的影响 |
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| 引用本文： | 徐沛,贾璇,王勇,亓雪娇,赵玉娇,李鸣晓. 流场对MEC生物阴极CO2还原性能与产物的影响[J]. 化工进展, 2022, 41(7): 3816-3823. DOI: 10.16085/j.issn.1000-6613.2021-1715 |
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| 作者姓名： | 徐沛 贾璇 王勇 亓雪娇 赵玉娇 李鸣晓 |
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| 作者单位： | 中国环境科学研究院,环境基准与风险评估国家重点实验室,北京100012;北京工商大学,国家环境保护食品链污染防治重点实验室,北京100048 |
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| 基金项目： | 国家重点研发计划(2019YFD1100304) |
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| 摘 要： | 针对微生物电解池 （microbial electrolysis cell，MEC）CO2还原过程阴极CO2还原速率低的问题，本文通过改变阴极室的流场环境，探究流场对生物阴极启动、运行、产物及功能微生物的影响，阐明MEC生物阴极CO2还原性能、产物转化、微生物群落对流场的响应关系。结果表明，流场不仅增强了生物阴极还原CO2能力（电子消耗量提高了10%，其中CO2产乙酸途径消耗电子量提高了30%），还使生物阴极的CO2还原途径由启动阶段的CO2还原产甲烷转变为运行阶段产乙酸。高通量分析表明，流场改变了生物阴极和阴极液的微生物群落结构，使阴极生物膜的嗜氢型产甲烷菌（Methanobacterium）向嗜乙酸型产甲烷菌（Methanosaeta）主导的群落演变。产乙酸菌群落（Petrimonas、Candidatus_Caldatribacterium）丰度较对照组提高了3.8%，在CO2产乙酸过程中起到重要作用。本研究可为MEC还原CO2产乙酸的定向调控研究提供理论和技术支撑。
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| 关 键 词： | 微生物电解池 生物阴极 CO2还原 流场 微生物群落 |
| 收稿时间： | 2021-08-11 |
Effect of flow field on the CO2 reduction performance and products of MEC biocathode |
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| XU Pei,JIA Xuan,WANG Yong,QI Xuejiao,ZHAO Yujiao,LI Mingxiao. Effect of flow field on the CO2 reduction performance and products of MEC biocathode[J]. Chemical Industry and Engineering Progress, 2022, 41(7): 3816-3823. DOI: 10.16085/j.issn.1000-6613.2021-1715 |
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| Authors: | XU Pei JIA Xuan WANG Yong QI Xuejiao ZHAO Yujiao LI Mingxiao |
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| Affiliation: | 1.State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
2.State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China |
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| Abstract: | This study focused on the issue of low CO2 reduction rate on the biocathode in microbial electrolysis cells (MECs). By changing the flow field environment of cathode chamber, the effect of flow field on the start-up, operation, products transformation and functional microorganism on the biocathode were explored. Furthermore, the response of CO2-reduction biocathode performance of MEC to flow field was clarified. The results showed that the flow field enhanced the ability of CO2-reduction of biocathode (electronic consumption increased by 10%, of which CO2 to acetic acid pathway consumption increased by 30%), and changed the CO2 reduction pathway of biocathode (from methane production in the start-up stage to acetic acid production in the operation stage). The high-throughput analysis showed that the flow field changed the microbial community structure of the biocathode and catholyte, making the biocathode dominated by the hydrogenotrophic methanogens (Methanobacterium) to that by the acetoclastic methanogens (Methanosaeta).The abundance of acetogenic bacterial communities (Petrimonas, Candidatus_Caldatribacterium) increased by 3.8% compared with the control group, which played an important role in the process of CO2-reductionforacetic acid production. This research aims to provide theoretical and technical support for the directed regulation of MEC reduction of CO2 to produce acetic acid. |
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| Keywords: | microbial electrolysis cell (MEC) biocathode CO2 reduction flow field microbial community structure |
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