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首页> 外文期刊>Environmental Science & Technology >Rates of As and Trace-Element Mobilization Caused by Fe Reduction in Mixed BTEX-Ethanol Experimental Plumes
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Rates of As and Trace-Element Mobilization Caused by Fe Reduction in Mixed BTEX-Ethanol Experimental Plumes

机译：混合BTEX-乙醇实验羽中Fe还原引起的As和微量元素动员率

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摘要

Biodegradation of organic matter, including petroleum-based fuels and biofuels, can create undesired secondary water-quality effects. Trace elements, especially arsenic (As), have strong adsorption affinities for Fe(ni) (oxyhydr)-oxides and can be released to groundwater during Fe-redudng biodegradation. We investigated the mobilization of naturally occurring As, cobalt (Co), chromium (Cr), and nickel (Ni) from wetland sediments caused by the introduction of benzene, toluene, ethylbenzene, and xylenes (BTEX) and ethanol mixtures under iron- and nitrate-reducing conditions, using in situ push-pull tests. When BTEX alone was added, results showed simultaneous onset and similar rates of Fe reduction and As mobilization. In the presence of ethanol, the maximum rates of As release and Fe reduction were higher, the time to onset of reaction was decreased, and the rates occurred in multiple stages that reflected additional processes. The concentration of As increased from ＜1 μg/L to a maximum of 99 μg/L, exceeding the 10 μg/L limit for drinking water. Mobilization of Co, Cr, and Ni was observed in association with ethanol biodegradation but not with BTEX. These results demonstrate the potential for trace-element contamination of drinking water during biodegradation and highlight the importance of monitoring trace elements at natural and enhanced attenuation sites.
机译：包括石油基燃料和生物燃料在内的有机物的生物降解会产生不良的二次水质影响。微量元素，尤其是砷（As），对Fe（ni）（羟基）氧化物具有很强的吸附亲和力，并且在Fe-redudng生物降解过程中可以释放到地下水中。我们研究了在铁和铁的作用下，由于引入苯，甲苯，乙苯和二甲苯（BTEX）和乙醇混合物而从湿地沉积物中动员了天然存在的As，钴（Co），铬（Cr）和镍（Ni）。使用原位推挽试验减少硝酸盐的条件。当单独添加BTEX时，结果显示同时发生且铁还原和As迁移率相似。在乙醇的存在下，As释放和Fe还原的最大速率更高，反应开始的时间减少，并且速率发生在多个阶段，这反映了额外的过程。砷的浓度从＜1μg/ L增加到最大99μg/ L，超过了饮用水的10μg/ L的极限。观察到Co，Cr和Ni的动员与乙醇的生物降解有关，但与BTEX无关。这些结果证明了生物降解过程中饮用水中微量元素污染的可能性，并强调了在自然衰减场所和增强衰减场所监测微量元素的重要性。

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  • 来源
    《Environmental Science & Technology》 |2015年第22期|13179-13189|共11页
  • 作者

    Brady A. Ziegler; Jennifer T. McGuire; Isabelle M. Cozzarelli;

  • 作者单位

    Department of Geosciences, Virginia Tech, Blacksburg, Virginia, 24061 United States;

    Department of Biology, University of St. Thomas, St. Paul, Minnesota, 5510S United States;

    U.S. Geological Survey, Reston, Virginia, 20192 United States;

  • 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
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