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首页> 外文期刊>Environmental Science & Technology >Biological Chromium(VI) Reduction in the Cathode of a Microbial Fuel Cell
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Biological Chromium(VI) Reduction in the Cathode of a Microbial Fuel Cell

机译：微生物燃料电池阴极中的生物铬（VI）还原

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摘要

The biocathode of a microbial fuel cell (MFC) offers a promising potential for the reductive treatment of oxidized pollutants. In this study, we demonstrated biological Cr(VI) reduction in the cathode of a MFC and identified putative Cr(VI) reducing microorganisms. The MFC was continuously monitored for Cr(VI) reduction and power generation. Acetate was provided to the anode compartment as substrate and bicarbonate was added to the cathode compartment as the sole external carbon source. The contribution of biomass decay and abiotic processes on Cr(VI) reduction was minimal, confirming that most of the Cr(VI) reduction was assisted by microbial activity in the cathode, which utilizes electrons and protons generated from the oxidation of acetate in the anode compartment Relatively fast Cr(VI) reduction was observed at initial Cr(VI) concentrations below 80 mg/L However, at 80 mg Cr(VI)/L, Cr(VI) reduction was extremely slow. A maximum Cr(VI) reduction rate of 0.46 mg Cr(VI)/g VSS·h was achieved, which resulted in a current and power density of 123.4 mA/ m~2 and 55.5 mW/m~2, respectively. The reduced chromium was nondetectable in the supernatant of the catholyte which indicated complete removal of chromium as Cr(OH)_3 precipitate. Analysis of the 16S rRNA gene based clone library revealed that the cathode biomass was largely dominated by phylotypes closely related to Trichococcus pasteurii and Pseudomonas aeruginosa, the putative Cr(VI) reducers.
机译：微生物燃料电池（MFC）的生物阴极为氧化污染物的还原处理提供了广阔的前景。在这项研究中，我们证明了MFC阴极中的生物Cr（VI）还原，并确定了推定的Cr（VI）还原微生物。连续监测MFC的Cr（VI）还原和发电情况。乙酸盐作为底物提供给阳极室，碳酸氢盐作为唯一的外部碳源添加到阴极室。生物量衰减和非生物过程对Cr（VI）还原的贡献极小，这证实了大部分Cr（VI）还原是由阴极中的微生物活性辅助的，该活性利用了阳极乙酸盐氧化产生的电子和质子。隔室在初始Cr（VI）浓度低于80 mg / L时观察到相对较快的Cr（VI）还原，但是在80 mg Cr（VI）/ L时，Cr（VI）还原非常缓慢。 Cr（VI）的最大还原速率为0.46 mg Cr（VI）/ g VSS·h，从而电流和功率密度分别为123.4 mA / m〜2和55.5 mW / m〜2。在阴极电解液的上清液中未检测到还原的铬，这表明随着Cr（OH）_3沉淀物铬的完全去除。对基于16S rRNA基因的克隆文库的分析表明，阴极生物质主要由与巴斯德毛球菌和铜绿假单胞菌（假定的Cr（VI）还原剂）密切相关的系统型占主导。

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  • 来源
    《Environmental Science & Technology》 |2009年第21期|8159-8165|共7页
  • 作者

    MADAN TANDUKAR; SAMUEL J. HUBER; TAKASHI ONODERA; SPYROS G. PAVLOSTATHIS;

  • 作者单位

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta Georgia 30332-0512;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta Georgia 30332-0512;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta Georgia 30332-0512;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta Georgia 30332-0512;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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