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首页> 外文期刊>Environmental Science & Technology >Geochemical and Isotope Study of Trichloroethene Degradation in a Zero-Valent Iron Permeable Reactive Barrier: A Twenty-Two-Year Performance Evaluation
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Geochemical and Isotope Study of Trichloroethene Degradation in a Zero-Valent Iron Permeable Reactive Barrier: A Twenty-Two-Year Performance Evaluation

机译：零价铁渗透性反应阻挡层中三氯乙烯降解的地球化学和同位素研究：二十二年性能评估

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This study provides a twenty-two-year record of in situ degradation of chlorinated organic compounds by a granular iron permeable reactive barrier (PRB). Groundwater concentrations of trichloroethene (TCE) entering the PRB were as high as 10670 mu g/L. Treatment efficiency ranged from 81 to 99%, and TCE concentrations from 1 mu g/L to 165 mu g/L were detected within and hydraulically down-gradient of the PRB. After 18 years, effluent TCE concentrations were above the maximum contaminant level (MCL) along segments of the PRB exhibiting upward trending influent TCE. Degradation products included cis-dichloroethene (cis-DCE), vinyl chloride (VC), ethene, ethane, C4 compounds, and possibly CO2(aq) and methane. Abiotic patterns of TCE degradation were indicated by compound specific stable isotope data and the distribution of degradation products. delta C-13 values of methane within and down-gradient of the PRB varied widely from 94 parts per thousand to 16 parts per thousand; these values cover most of the isotopic range encountered in natural methanogenic systems. Methanogenesis is a sink for inorganic carbon in zerovalent iron PRBs that competes with carbonate mineralization, and this process is important for understanding pore-space clogging and longevity of iron-based PRBs. The carbon isotope signatures of methane and inorganic carbon were consistent with open-system behavior and 22% molar conversion of CO2(aq) to methane.
机译：这项研究提供了22年的粒状铁渗透性反应性屏障（PRB）原位降解氯化有机化合物的记录。进入PRB的地下水中三氯乙烯（TCE）的浓度高达10670μg / L。处理效率在81％到> 99％之间，并且在PRB内和水力下降的地方检测到TCE浓度从<1μg/ L到165μg/ L。 18年后，沿TCB呈上升趋势的PRB部分，出水TCE浓度高于最大污染物水平（MCL）。降解产物包括顺式二氯乙烯（cis-DCE），氯乙烯（VC），乙烯，乙烷，> C4化合物，可能还有CO2（aq）和甲烷。 TCE降解的非生物模式由化合物特定的稳定同位素数据和降解产物的分布指示。 PRB内和下坡度的甲烷δC-13值差异很大，从千分之94到千分之十六；这些值涵盖了自然产甲烷系统中遇到的大多数同位素范围。甲烷生成是零价铁PRB中无机碳的汇，它与碳酸盐矿化竞争，并且此过程对于了解铁基PRB的孔空间堵塞和寿命很重要。甲烷和无机碳的碳同位素特征与开放系统行为和22％的CO2（aq）转化为甲烷的行为一致。

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  • 来源
    《Environmental Science & Technology》 |2019年第1期|296-306|共11页
  • 作者

    Wilkin Richard T.; Lee Tony R.; Sexton Molly R.; Acree Steven D.; Puls Robert W.; Blowes David W.; Kalinowski Christopher; Tilton Jennifer M.; Woods Leilani L.;

  • 作者单位

    US EPA, Natl Risk Management Res Lab, Groundwater Watershed & Ecosyst Restorat Div, 919 Kerr Res Dr, Ada, OK 74820 USA;

    US EPA, Natl Risk Management Res Lab, Groundwater Watershed & Ecosyst Restorat Div, 919 Kerr Res Dr, Ada, OK 74820 USA;

    US EPA, Natl Risk Management Res Lab, Groundwater Watershed & Ecosyst Restorat Div, 919 Kerr Res Dr, Ada, OK 74820 USA;

    US EPA, Natl Risk Management Res Lab, Groundwater Watershed & Ecosyst Restorat Div, 919 Kerr Res Dr, Ada, OK 74820 USA;

    PulsEnvironm Consulting, Hilton Head Isl, SC 29926 USA;

    Univ Waterloo, Dept Earth & Environm Sci, Waterloo, ON N2L 3G1, Canada;

    Arcadis US Inc, 801 Corp Ctr Dr,Suite 300, Raleigh, NC 27607 USA;

    Arcadis US Inc, 801 Corp Ctr Dr,Suite 300, Raleigh, NC 27607 USA;

    US Coast Guard Base, 1664 Weeksville Rd,Bldg 981, Elizabeth City, NC 27909 USA;

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