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首页> 外文期刊>Environmental Science & Technology >Natural Attenuation and Anaerobic Benzene Detoxification Processes at a Chlorobenzene-Contaminated Industrial Site Inferred from Field Investigations and Microcosm Studies
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Natural Attenuation and Anaerobic Benzene Detoxification Processes at a Chlorobenzene-Contaminated Industrial Site Inferred from Field Investigations and Microcosm Studies

机译：通过现场调查和微观研究推断，氯苯污染的工业场所的自然衰减和厌氧苯的解毒过程

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src="http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-1/acs.est.7b04145/20171226/images/medium/es-2017-04145r_0006.gif">A five-year site investigation was conducted at a former chemical plant in Nanjing, China. The main contaminants were 1,2,4-trichlorobenzene (TCB) reaching concentrations up to 7300 μg/L, dichlorobenzene (DCB) isomers, monochlorobenzene (MCB), and benzene. Over time, these contaminants naturally attenuated to below regulatory levels under anaerobic conditions. To confirm the transformation processes and to explore the mechanisms, a corresponding laboratory microcosm study was completed demonstrating that 1,2,4-TCB was dechlorinated to 1,2-DCB, 1,3-DCB, and 1,4-DCB in approximately 2%/10%/88% molar proportions. The DCB isomers were dechlorinated via MCB to benzene, and, finally, benzene was degraded under prevailing sulfate-reducing conditions. Dechlorination could not be attributed to known dechlorinators Dehalobacter or Dehalococcoides, while anaerobic benzene degradation was mediated by microbes affiliated to a Deltaproteobacterium ORM2, previously associated with this activity. Unidentified organic compounds, possibly aromatic compounds related to past on-site production processes, were fueling the dechlorination reactions in situ. The microcosm study confirmed transformation processes inferred from field data and provided needed assurance for natural attenuation. Activity-based microcosm studies are often omitted from site characterization in favor of rapid and less expensive molecular surveys. However, the value of microcosm studies for confirming transformation processes, establishing electron balances, assessing cocontaminant inhibition, and validating appropriate monitoring tools is clear. At complex sites impacted by multiple compounds with poorly characterized transformation mechanisms, activity assays provide valuable data to incorporate into the conceptual site model to most effectively inform remediation alternatives.
机译：src =“ http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2018/esthag.2018.52.issue-1/acs.est.7b04145/20171226/images/medium /es-2017-04145r_0006.gif“>在中国南京的一家前化工厂进行了为期五年的现场调查。主要污染物为浓度高达7300μg/ L的1,2,4-三氯苯（TCB），二氯苯（DCB）异构体，一氯苯（MCB）和苯。随着时间的流逝，这些污染物在厌氧条件下自然会衰减至规定水平以下。为了确定转化过程并探讨其机理，完成了相应的实验室缩影研究，表明1,2,4-TCB大约在大约1,2,4-DCB，1,3-DCB和1,4-DCB中被脱氯。 2％/ 10％/ 88％的摩尔比例。 DCB异构体通过MCB脱氯成苯，最后，在普遍的硫酸盐还原条件下苯被降解。脱氯不能归因于已知的脱氯剂 Dehalobacter 或 Dehalococcoides ，而厌氧苯的降解是由与 Deltaproteobacterium ORM2相关的微生物介导的，该微生物以前与这项活动。身份不明的有机化合物，可能是与过去的现场生产过程有关的芳族化合物，正在推动原地的脱氯反应。微观研究证实了从野外数据推断出的转化过程，并为自然衰减提供了必要的保证。基于活动的缩影研究通常在站点表征中被忽略，而有利于快速且便宜的分子调查。但是，微观研究对于确认转化过程，建立电子平衡，评估共污染物抑制以及验证适当的监测工具的价值是显而易见的。在复杂的场所中，多种化合物的转化机制表征不佳，活性测定可提供有价值的数据，以整合到概念性场所模型中，从而最有效地提供补救方案。

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  • 来源
    《Environmental Science & Technology》 |2018年第1期|22-31|共10页
  • 作者

    Wenjing Qiao; Fei Luo; Line Lomheim; Elizabeth Erin Mack; Shujun Ye; Jichun Wu; Elizabeth A. Edwards;

  • 作者单位

    Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China,Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto M5S 3E5, Canada;

    Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto M5S 3E5, Canada;

    Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto M5S 3E5, Canada;

    DuPont Corporate Remediation Group, Wilmington, Delaware 19805, United States;

    Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China;

    Key Laboratory of Surficial Geochemistry, Ministry of Education, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210046, China;

    Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto M5S 3E5, Canada;

  • 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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