浅型湿地床与功能生物阴极微生物电化学系统（MES）耦合后的性能提升与微生物相互作用。
Enhanced performance and microbial interactions of shallow wetland bed coupling with functional biocathode microbial electrochemical system (MES).
机构信息
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
出版信息
Sci Total Environ. 2022 Sep 10;838(Pt 3):156383. doi: 10.1016/j.scitotenv.2022.156383. Epub 2022 May 31.
It is essential to remediate the polluted urban river, which endangers the aquatic creatures and affected human body's senses. The treatment wetland combined with microbial electrochemical system (MES) used for the remediation is becoming a new research focus due to its ideal pollutants removal efficiency and small footprint. Here this paper provided a kind of novel shallow wetland bed coupling with close-circuit microbial electrochemical system (WB-CMES) to remove pollutants in surface water. In contrast to the shallow wetland bed coupling with open-circuit MES (WB-OMES) and the shallow wetland bed without MES (WB), the enhancing effects and pollutants removal pathway were evaluated. After 62-day operation, average TN removal efficiency in WB-CMES was 87.7%, which was 19.7% and 13.8% higher than that of WB-OMES and WB respectively. The rate coefficient k of NO-N degradation in WB-CMES was 1.6 and 1.8 times higher than that in WB-OMES and WB. The results of chlorophyll, protein and superoxide dismutase (SOD) in WB-CMES were 27.3%, 44.3% and 12.9% higher than those in WB. The microbial community structure analysis indicated that electroactive bacteria on anode like Desulfobulbus could oxidize organics and generate electrons to compensate cathode, meanwhile, cathode could enrich more species of functional bacteria like Rhodobacter, Pirellula, Hyphomicrobium, Thauera, which had a synergistic effect on oxygen reduction, nitrogen removal and plant growth. The results indicated that oxygen produced by submerged plants could be utilized by the oxygen-reducing functional biocathode of MES and the proper aerobic and anoxic environment might enhance nitrate removal mainly through simultaneous nitrification and denitrification (SND), aerobic denitrification and anammox. This research provided a novel technology with advantages of simple operation, flexible configuration, easy scale-up and low cost for application in remediation of highly polluted surface water.
修复受污染的城市河流至关重要，因为这不仅危害水生生物，还会影响人体感官。由于具有理想的污染物去除效率和较小的占地面积，因此，将处理湿地与微生物电化学系统（MES）结合用于修复已成为新的研究重点。本文提供了一种新型的浅床湿地与闭路微生物电化学系统（WB-CMES）耦合的方法，用于去除地表水中的污染物。与浅床湿地与开路 MES（WB-OMES）和没有 MES 的浅床湿地（WB）相比，评估了增强效果和污染物去除途径。经过 62 天的运行，WB-CMES 中的平均 TN 去除效率为 87.7％，分别比 WB-OMES 和 WB 高 19.7％和 13.8％。WB-CMES 中 NO-N 降解的速率常数 k 比 WB-OMES 和 WB 分别高 1.6 和 1.8 倍。WB-CMES 中叶绿素、蛋白质和超氧化物歧化酶（SOD）的含量分别比 WB 高 27.3％、44.3％和 12.9％。微生物群落结构分析表明，阳极上的电活性细菌（如脱硫弧菌）可以氧化有机物并产生电子来补偿阴极，同时，阴极可以富集更多功能细菌，如红杆菌、聚球藻、微菌属、陶厄氏菌等，这对氧还原、氮去除和植物生长具有协同作用。结果表明，淹没植物产生的氧气可以被 MES 的氧还原功能生物阴极利用，适当的好氧和缺氧环境可能主要通过同步硝化反硝化（SND）、好氧反硝化和厌氧氨氧化来增强硝酸盐的去除。本研究为应用于高度污染地表水的修复提供了一种具有操作简单、配置灵活、易于规模化和低成本等优点的新型技术。
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