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Bioremediation of nitrate-polluted groundwater in a microbial fuel cell

机译:微生物燃料电池中硝酸盐污染的地下水的生物修复

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摘要

BACKGROUND: Groundwater quality is threatened by nitrate accumulation in several regions around the world. Nitrate must be removed from contaminated groundwater to use it as drinking water. Microbial fuel cells (MFCs) can be used for autotrophic denitrification. Thus, the use of MFCs is a potential alternative to using traditional methods for treating nitrate-polluted groundwater. RESULTS: The objective of this study was to evaluate the potential of MFC technology to treat nitrate-polluted groundwater (28.32±6.15 mgN-NO3 - L-1). The bioanode was fed with an acetate solution that permitted electron and proton flux to the biocathode. Initially, nitrite was observed in the effluent. After 97days of operation, the denitrifying-MFC reduced the nitrate and nitrite concentrations in the effluent (12.14±3.59 mgN-NO3 - L-1 and 0.14±0.13 mgN-NO2 - L-1).Thus, this method improved water quality to meet World Health Organisation standards. However, nitrous oxide emissions were deduced from the electron balance, cathode coulumbic efficiency and Tafel plots. Bioelectrochemical evolution of the biocathode was related to the denitrification nature (sequential reaction steps from NO3 - to N2, through NO2 - and N2O as stable intermediates) and was supported by the Tafel plots. CONCLUSION: The bioremediation of nitrate-polluted groundwater with a MFC biocathode is feasible
机译:背景:地下水质量受到全球多个地区硝酸盐积累的威胁。必须从受污染的地下水中除去硝酸盐,以将其用作饮用水。微生物燃料电池(MFCs)可用于自养反硝化。因此,使用MFCs可以替代使用传统方法来处理硝酸盐污染的地下水。结果:本研究的目的是评估MFC技术处理硝酸盐污染的地下水(28.32±6.15 mgN-NO3-L-1)的潜力。给生物阳极供给乙酸盐溶液,该溶液允许电子和质子通向生物阴极。最初,在废水中观察到亚硝酸盐。运行97天后,反硝化MFC降低了废水中的硝酸盐和亚硝酸盐浓度(12.14±3.59 mgN-NO3-L-1和0.14±0.13 mgN-NO2-L-1),从而将水质提高至符合世界卫生组织的标准。但是,一氧化二氮的排放是由电子平衡,阴极库仑效率和Tafel图推导出的。生物阴极的生物电化学演化与反硝化性质有关(从NO3-到N2的连续反应步骤,通过NO2-和N2O作为稳定的中间体),并得到了Tafel图的支持。结论:利用MFC生物阴极对硝酸盐污染的地下水进行生物修复是可行的。

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