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首页> 外文期刊>RSC Advances >Acclimated sediment microbial fuel cells from a eutrophic lake for the in situ denitrification process
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Acclimated sediment microbial fuel cells from a eutrophic lake for the in situ denitrification process

机译：来自富营养化湖泊的沉积物微生物燃料电池，用于原位反硝化过程

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摘要

Sediment microbial fuel cells (SMFCs) with various external resistances were acclimated at the north of Lake Taihu for two months. Then, each SMFC was transferred to a container and operated in batch mode for evaluating its electrochemical and denitrification performances. The nitrate removal efficiencies of SMFCs that were connected to the external resistances of 510, 100, 51, 10 and 1 Omega were 12%, 20%, 32%, 42.1% and 60%, respectively. Conversely, the nitrate concentration increased by 0.05 mg L-1 for the SMFC with 1000 Omega external resistance. The microbial community of the biocathode in the SMFC with 1 Omega external resistance was determined. Proteobacteria (48.04%), Bacteroidetes (9.87%) and Chloroflexi (9.8%) were identified as the dominant phyla. The microbial community analysis and half-cell tests revealed that the acclimated biocathode could simultaneously promote a denitrification reaction and an oxygen reduction reaction. In addition, Nitrosomonadales and Nitrospirales on the biocathode facilitated the ammonia oxidation reaction which caused a mixed potential. The mixed potential was enhanced by increasing ammonia concentration and decreased the biocathode performance.
机译：具有不同外部阻力的沉积物微生物燃料电池（SMFCs）在太湖北部适应了两个月。然后，将每个SMFC转移到容器中，并以批处理模式运行以评估其电化学和反硝化性能。与510、100、51、10和1Ω的外部电阻相连的SMFC的硝酸盐去除效率分别为12％，20％，32％，42.1％和60％。相反，对于具有1000Ω外部电阻的SMFC，硝酸盐浓度增加了0.05 mg L-1。确定了具有1Ω外部阻力的SMFC中生物阴极的微生物群落。细菌群（48.04％），拟杆菌（9.87％）和叶绿藻（9.8％）被鉴定为优势菌群。微生物群落分析和半电池测试表明，适应的生物阴极可以同时促进反硝化反应和氧还原反应。另外，生物阴极上的亚硝基柠檬酸酯和硝基螺菌促进了氨氧化反应，引起了混合电位。通过增加氨浓度提高混合电位，并降低生物阴极性能。

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