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首页> 外文期刊>Environmental Science & Technology >Relative Contributions of Dehalobacter and Zerovalent Iron in the Degradation of Chlorinated Methanes
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Relative Contributions of Dehalobacter and Zerovalent Iron in the Degradation of Chlorinated Methanes

机译：脱卤菌和零价铁在氯化甲烷降解中的相对贡献

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摘要

The role of bacteria and zerovalent iron (Fe~0) in the degradation of chlorinated solvents in subsurface environments is of interest to researchers and remediation practitioners alike. Fe~0 used in reactive iron barriers for groundwater remediation positively interacted with enrichment cultures containing Dehalobacter strains in the transformation of halogenated methanes. Chloroform transformation and dichloromethane formation was up to 8-fold faster and 14 times higher, respectively, when a Dehalobacter-containing enrichment culture was combined with Fe~0 compared with Fe~0 alone. The dichloromethane-fermenting culture transformed dichloromethane up to three times faster with Fe~0 compared to without. Compound-specific isotope analysis was employed to compare abiotic and biotic chloroform and dichloromethane degradation. The isotope enrichment factor for the abiotic chloroform/Fe~0 reaction was large at -29.4 ± 2.1‰, while that for chloroform respiration by Dehalobacter was minimal at -4.3 ± 0.45‰. The combined abiotic/biotic dechlorination was -8.3 ± 0.7‰, confirming the predominance of biotic dechlorination. The enrichment factor for dichloromethane fermentation was -15.5 ± 1.5‰; however, in the presence of Fe° the factor increased to -23.5 ± 2.1‰, suggesting multiple mechanisms were contributing to dichloromethane degradation. Together the results show that chlorinated methane-metabolizing organisms introduced into reactive iron barriers can have a significant impact on trichloromethane and dichloromethane degradation and that compound-specific isotope analysis can be employed to distinguish between the biotic and abiotic reactions involved.
机译：细菌和零价铁（Fe〜0）在地下环境中降解氯化溶剂中的作用引起研究人员和补救从业人员的兴趣。在用于地下水修复的反应性铁屏障中使用的Fe〜0与含有Dehalobacter菌株的富集培养物在卤代甲烷的转化中正向相互作用。当含Dehalobacter的富集培养物与Fe〜0混合时，与单独的Fe〜0相比，氯仿的转化和二氯甲烷的形成分别快8倍和高14倍。与没有使用Fe〜0相比，使用Fe〜0进行二氯甲烷发酵的培养物转化二氯甲烷的速度快三倍。使用化合物特异性同位素分析来比较非生物和生物氯仿和二氯甲烷的降解。非生物氯仿/ Fe〜0反应的同位素富集系数较大，为-29.4±2.1‰，而脱盐细菌的氯仿呼吸富集系数最小，为-4.3±0.45‰。非生物/生物脱氯合计为-8.3±0.7‰，证实了生物脱氯的优势。二氯甲烷发酵的富集因子为-15.5±1.5‰。然而，在Fe°存在下，该因子增加至-23.5±2.1‰，表明多种机理导致了二氯甲烷的降解。总之，结果表明，引入反应性铁屏障的氯化甲烷代谢生物可对三氯甲烷和二氯甲烷的降解产生重大影响，化合物特异性同位素分析可用于区分所涉及的生物反应和非生物反应。

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  • 来源
    《Environmental Science & Technology》 |2015年第7期|4481-4489|共9页
  • 作者

    Matthew Lee; Eliza Wells; Yie Kuan Wong; Joanna Koenig; Lorenz Adrian; Hans H. Richnow; Mike Manefield;

  • 作者单位

    School of Biotechnology and Biomolecular Science, University of New South Wales, Kensington, Sydney 2052, Australia;

    School of Biotechnology and Biomolecular Science, University of New South Wales, Kensington, Sydney 2052, Australia;

    School of Biotechnology and Biomolecular Science, University of New South Wales, Kensington, Sydney 2052, Australia;

    School of Biotechnology and Biomolecular Science, University of New South Wales, Kensington, Sydney 2052, Australia;

    Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ, Permoser Strasse 15, Leipzig 04318, Germany;

    Department of Isotope Biogeochemistry, Helmholtz Centre for Environmental Research-UFZ, Permoser Strasse 15, Leipzig 04318, Germany;

    School of Biotechnology and Biomolecular Science, University of New South Wales, Kensington, Sydney 2052, Australia;

  • 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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