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首页> 外文期刊>Environmental Science & Technology >In Situ Sequestration of Hydrophobic Organic Contaminants in Sediments under Stagnant Contact with Activated Carbon. 2. Mass Transfer Modeling
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In Situ Sequestration of Hydrophobic Organic Contaminants in Sediments under Stagnant Contact with Activated Carbon. 2. Mass Transfer Modeling

机译：与活性炭停滞接触下沉积物中疏水有机污染物的原位螯合。 2.传质建模

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摘要

The validity of a hydrophobic organic contaminant mass transfer model to predict the effectiveness of in situ activated carbon (AC) treatment under stagnant sediment-AC contact is studied for different contaminants and sediments. The modeling results and data from a previous 24-month column experiment of uptake in polyethylene samplers are within a factor of 2 for parent- and alkylated-polycyclic aromatic hydrocarbons in petroleum-impacted sediment and factors of 3-10 for polychlorinated biphenyls. The model successfully reproduces the relative effects of AC-sediment contact time, contaminant properties, AC particle size, AC mixing regime, AC distribution, and hydraulic conditions observed in the sediment column experiments. The model tracks contaminant concentrations in different sediment compartments over time, which provides useful information on the contaminant sequestration by the added AC. Long-term projection of the effectiveness of AC amendment using the model shows that the effects of AC particle size and particle-scale heterogeneity in AC distribution are pronounced within a year or so. However, the effect of those factors becomes less significant after a much longer contact period (on the order of a decade or two), resulting in substantial reduction in pore-water concentrations, for example, greater than 99% for benz[a] anthracene, under various scenarios.
机译：研究了对于不同的污染物和沉积物，疏水性有机污染物传质模型预测沉积物-AC接触停滞下原位活性炭（AC）处理的有效性的有效性。先前在聚乙烯采样器中进行的24个月柱吸收实验的建模结果和数据，在石油撞击沉积物中的母体和烷基化多环芳烃的系数在2的范围内，而多氯联苯在3-10的范围内。该模型成功地再现了沉积物塔实验中观察到的交流沉积物接触时间，污染物性质，交流颗粒大小，交流混合方式，交流分布和水力条件的相对影响。该模型随时间跟踪不同沉积物隔室中的污染物浓度，这提供了有关添加的AC隔离污染物的有用信息。使用该模型对AC改性效果的长期预测表明，在一年左右的时间内，AC粒度和粒度异质性对AC分布的影响就很明显。但是，这些因素的影响在更长的接触时间后（大约十年或两次）变得不那么显着，导致孔隙水浓度大大降低，例如苯并[a]蒽的99％以上，在各种情况下。

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  • 来源
    《Environmental Science & Technology》 |2014年第3期|1843-1850|共8页
  • 作者

    Yongju Choi; Yeo-Myoung Cho; David Werner; Richard G. Luthy;

  • 作者单位

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-4020, United States;

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-4020, United States;

    School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom;

    Department of Civil and Environmental Engineering, Stanford University, Stanford, California 94305-4020, 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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