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首页> 外文期刊>Environmental Science & Technology >Impact of Ethanol on the Natural Attenuation of Benzene,Toluene,and o-Xylene in a Normally Sulfate-Reducing Aquifer
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Impact of Ethanol on the Natural Attenuation of Benzene,Toluene,and o-Xylene in a Normally Sulfate-Reducing Aquifer

机译：乙醇对通常还原硫酸盐的含水层中苯，甲苯和邻二甲苯自然衰减的影响

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摘要

Side-by-side experiments were conducted in a sulfate-reducing aquifer at a former fuel station to evaluate the effect of ethanol on biodegradation of other gasoline constituents.On one side,for approx 9 months we injected groundwater amended with 1-3 mg/L benzene,toluene,and o-xylene (BToX).On the other side,we injected the same,adding approx 500 mg/L ethanol.Initially the BToX plumes on both sides ("lanes")extended approximately the same distance.Thereafter,the plumes in the "No Ethanol Lane"retracted significantly,which we hypothesize to be due to an initial acclimation period followed by improvement in efficiency of biodegradation under sulfate-reducing conditions.In the "With Ethanol Lane",the BToX plumes also retracted,but more slowly and not as far.The preferential biodegradation of ethanol depleted dissolved sulfate,leading to methanogenic/acetogenic conditions.We hypothesize that BToX in the ethanol-impacted lane were biodegraded in part within the methanogenic/acetogenic zone and,in part,within sulfate-reducing zones developing along the plume fringes due to mixing with sulfate-containing groundwater surrounding the plumes due to dispersion and/or shifts in flow direction.Overall,this research confirms that ethanol may reduce rates of biodegradation of aromatic fuel components in the subsurface,in both transient and near steady-state conditions.
机译：在前加油站的硫酸盐还原含水层中进行了并排实验，以评估乙醇对其他汽油成分的生物降解的影响。一方面，我们注入约1-3个月的地下水，修正了1-3 mg / L苯，甲苯和邻二甲苯（BToX）。在另一侧，我们注入约500 mg / L乙醇。最初，BToX两侧的羽流（“泳道”）延伸了大约相同的距离。 ，“无乙醇通道”中的羽流显着回缩，我们认为这是由于最初的适应期，随后是在硫酸盐还原条件下生物降解效率提高所致。在“有乙醇通道”中，BToX羽流也回缩了乙醇的优先生物降解会耗尽溶解的硫酸盐，从而导致产甲烷/产乙酸条件。我们假设乙醇影响通道中的BToX会在产甲烷/产乙酸区域内被部分生物降解。并且，部分由于在流向中的分散​​和/或移动而与围绕着羽流的含硫酸盐的地下水混合，导致在沿羽流条纹形成的硫酸盐还原带内。总体而言，这项研究证实乙醇可能会降低乙醇的生物降解速率。在瞬态和接近稳态条件下，地下的芳香燃料成分。

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  • 来源
    《Environmental Science & Technology》 |2006年第19期|p.6123-6130|共8页
  • 作者

    NICHOLAS R.DE SIEYES; MURRAY D.EINARSON;

  • 作者单位

    Department of Land,Air,and Water Resources,University of California at Davis,Davis,California 95616,Geomatrix Consultants,Oakland,California 94612,and U.S.Environmental Protection Agency,Ada,Oklahoma 74821;

  • 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 环境化学;
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