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Treatment of trichloroethene and hexavalent chromium by granular iron in the presence of dissolved CaCO_3

机译:溶解CaCO_3存在的颗粒铁处理三氯乙烯和六价铬。

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摘要

Column experiments and numerical simulations were conducted to evaluate the effects of Cr(Ⅵ) and dissolved CaCO_3 on the iron reactivity towards trichloroethene (TCE) and Cr(VI) reduction. Column experiments included measurements of iron corrosion potential and characterization of surface film composition using Raman spectroscopy. Three columns received different combinations of TCE (5 mg L~(-1)). Cr(Ⅵ) (10 mg L~(-1)) and dissolved CaCO_3 (300 mg L~(-1)), after short periods of conditioning with Millipore water followed by 10 mg L~(-) TCE in Millipore water, for a total of 8 months. The results showed that coexistence with TCE did not affect Cr(Ⅵ) reduction kinetics, however, the presence of Cr(Ⅵ) reduced TCE degradation rates significantly. The formation of Fc(Ⅲ)/Cr(Ⅲ) products caused progressive passivation of the iron and was consistent with the increase in corrosion potential. The presence of dissolved CaCO_3 resulted in a stable corrosion potential and faster degradation rates of TCE and Cr(Ⅵ). Over time, however, the accumulation of secondary carbonate minerals on the iron surface decreased the iron reactivity. Numerical simulation using a reactive transport model reproduced the observations from the column experiments reasonably well. The simulation can be valuable in the design of PRBs or in the development of effective maintenance procedures for PRBs treating groundwater co-contaminated with Cr(Ⅵ) and TCE in the presence of dissolved CaCO_3.
机译:进行了柱实验和数值模拟,以评估Cr(Ⅵ)和溶解的CaCO_3对铁对三氯乙烯(TCE)和Cr(VI)还原反应的影响。柱实验包括使用拉曼光谱法测量铁的腐蚀电位和表征表面膜成分。 3根色谱柱接受了不同的TCE组合(5 mg L〜(-1))。在用Millipore水和随后在Millipore水中的10 mg L〜(-)TCE进行短暂处理后,将Cr(Ⅵ)(10 mg L〜(-1))和溶解的CaCO_3(300 mg L〜(-1))溶解,共8个月。结果表明,与三氯乙烯共存不会影响Cr(Ⅵ)的还原动力学,但是,三价铬的存在会显着降低三氯乙烯的降解速率。 Fc(Ⅲ)/ Cr(Ⅲ)产物的形成引起铁的逐渐钝化,并且与腐蚀电位的增加一致。溶解的CaCO_3的存在导致稳定的腐蚀电位和更快的TCE和Cr(Ⅵ)降解速率。然而,随着时间的流逝,次生碳酸盐矿物在铁表面的积累降低了铁的反应性。使用反应性输运模型的数值模拟相当好地再现了来自柱实验的观察结果。该模拟对于PRBs的设计或开发有效的维护程序对于在溶解的CaCO_3存在下处理被Cr(Ⅵ)和TCE共同污染的地下水的维护程序具有重要的价值。

著录项

  • 来源
    《Journal of Contaminant Hydrology》 |2013年第1期|108-121|共14页
  • 作者单位

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1,Coffey Geotechnics, Toronto. Ontario, Canada M9W 1A4;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1,Pest Management Regulatory Agency, Health Canada, Ottawa, Ontario. Canada K1A 0K9;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1;

  • 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
  • 中图分类
  • 关键词

    granular iron; permeable reactive barrier; longevity; trichloroethene; hexavalent chromium; calcium carbonate;

    机译:粒状铁渗透反应性屏障长寿;三氯乙烯六价铬碳酸钙;
  • 入库时间 2022-08-17 13:40:48

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