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首页> 外文期刊>Ground Water Monitoring & Remediation >Flowpath Independent Monitoring of Reductive Dechlorination Potential in a Fractured Rock Aquifer
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Flowpath Independent Monitoring of Reductive Dechlorination Potential in a Fractured Rock Aquifer

机译：裂隙含水层中还原性脱氯潜势的流径独立监测

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摘要

The flowpath dependent approaches that are typically employed to assess biodegradation of chloroethene contaminants in unconsolidated aquifers are problematic in fractured rock settings, due to difficulties defining discrete groundwater flowpaths in such systems. In this study, the variation in the potential for chloroethene biodegradation with depth was evaluated in a fractured rock aquifer using two flowpath independent lines of field evidence: (1) the presence of the three biochemical prerequisites [electron donor(s), chloroethene electron acceptor(s), and chlororespiring microorganism(s)] for efficient chloroethene chlororespiration and (2) the in situ accumulation of chloroethene reductive dechlorination daughter products. The validity of this approach was assessed by comparing field results with the results of [1, 2-~(14)C] cis-DCE microcosm experiments. Microcosms were prepared with depth-specific core material, which was crushed and emplaced in discrete packer intervals for 1 year to allow colonization by the indigenous microbial community. Packer intervals characterized by significant electron donor concentrations, elevated numbers of chlororespiring microorganisms, and high reductive dechlorination product to parent contaminant ratios correlated well with the production of ~(14)C-labeled reductive dechlorination products in the microcosm experiments. These results indicate that, in the absence of information on discrete groundwater flowpaths, a modified approach emphasizing flowpath independent lines of evidence can provide insight into the temporal and spatial variability of contaminant biodegradation in fractured rock systems.
机译：由于在这样的系统中难以确定离散的地下水流径，因此在破裂岩石环境中通常用于评估未固结含水层中氯乙烯污染物生物降解的流径依赖方法是有问题的。在这项研究中，使用两条与流径无关的现场证据评估了裂隙岩层中氯乙烯生物降解潜能随深度的变化：（1）存在三种生化先决条件[电子供体，氯乙烯电子受体（一种或多种和氯呼吸微生物），以进行有效的氯乙烯氯呼吸作用和（2）氯乙烯还原性脱氯子产物的原位累积。通过将现场结果与[1，2-〜（14）C]顺-DCE微观实验的结果进行比较，评估了该方法的有效性。用深度特定的核心材料制备缩影，将其压碎并以不连续的封隔器间隔放置一年，以使土著微生物群落能够定殖。 Packer间隔的特征在于显着的电子供体浓度，增加的氯呼吸微生物数量，以及高还原性脱氯产物与母体污染物的比率，与微观实验中〜（14）C标记的还原性脱氯产物的产生密切相关。这些结果表明，在没有有关离散地下水流径的信息的情况下，一种强调流径独立证据的改进方法可以提供洞察力，以了解裂隙岩石系统中污染物生物降解的时空变化。

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  • 来源
    《Ground Water Monitoring & Remediation》 |2009年第4期|46-55|共10页
  • 作者

    Paul M. Bradley; Pierre J. Lacombe; Thomas E. Imbrigiotta; Francis H. Chapelle; Daniel J. Goode;

  • 作者单位

    U.S. Geological Survey, South Carolina Water Science Center, Columbia, SC 29210;

    U.S. Geological Survey, New Jersey Water Science Center, West Trenton, NJ 08628;

    U.S. Geological Survey, New Jersey Water Science Center, West Trenton, NJ 08628;

    U.S. Geological Survey, South Carolina Water Science Center, Columbia, SC 29210;

    U.S. Geological Survey, Pennsylvania Water Science Center, Exton, PA 19341;

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