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首页> 外文期刊>Environmental Science & Technology >Application of Electrolysis to Stimulate Microbial Reductive PCE Dechlorination and Oxidative VC Biodegradation
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Application of Electrolysis to Stimulate Microbial Reductive PCE Dechlorination and Oxidative VC Biodegradation

机译：电解在刺激微生物还原性PCE脱氯和氧化VC生物降解中的应用

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摘要

A novel approach was applied to stimulate biodegradation of chloroethenes by a coupled bioelectro-process. In a flow-through column system, microbial dechlorination of tetrachloroethene to cis-dichloroethene, vinyl chloride, and ethene was stimulated by hydrogen produced by water electrolysis. Dechlorinating bacteria (Dehalococcoides spp. and Desulfitobacterium spp.) and also methanogens and homoacetogens were detected in the anaerobic column. Simultaneously, oxidative biodegradation of lower chlorinated metabolites (vinyl chloride) was stimulated by electrolytic oxygen formation in the corresponding aerobic column. The process was stable for more than 100 days and an average removal of approximately 23 μmol/d PCE and 72 μmol/d vinyl chloride was obtained with a current density of 0.05 mA/cm~2. Abiotic electrochemical degradation of the contaminants was not observed. Microbial dechlorination correlated with the current densities in the applied range of 0.01-0.05 mA/cm~2. The results are promising for environmental applications, since with electrolysis hydrogen and oxygen can be supplied continuously to chloroethene degrading microorganisms, and the supply rates can be easily controlled by adjusting the electric current.
机译：一种新颖的方法被应用于通过耦合生物电化学过程刺激氯乙烯的生物降解。在流通塔系统中，水电解产生的氢气刺激了四氯乙烯的微生物脱氯反应生成顺式二氯乙烯，氯乙烯和乙烯。在厌氧柱中检测到了脱氯细菌（Dehalococcoides spp。和Desulfitobacterium spp。），以及产甲烷菌和高产乙酸菌。同时，在相应的好氧柱中，电解氧的形成促进了低级氯代代谢物（氯乙烯）的氧化生物降解。该过程稳定超过100天，在电流密度为0.05 mA / cm〜2的情况下，平均去除率约为23μmol/ d PCE和72μmol/ d氯乙烯。没有观察到污染物的非生物电化学降解。在0.01-0.05 mA / cm〜2的应用范围内，微生物脱氯与电流密度相关。该结果对于环境应用是有希望的，因为通过电解可以将氢和氧连续地供应给降解氯乙烯的微生物，并且可以通过调节电流来容易地控制供应速率。

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  • 来源
    《Environmental Science & Technology》 |2009年第18期|7098-7104|共7页
  • 作者

    SVENJA T. LOHNER; ANDREAS TIEHM;

  • 作者单位

    Water Technology Center, Department of Environmental Biotechnology, Karlsruher Strasse 84, 76139 Karlsruhe, Germany;

    Water Technology Center, Department of Environmental Biotechnology, Karlsruher Strasse 84, 76139 Karlsruhe, Germany;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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