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首页> 外文期刊>Environmental Science & Technology >Natural Organic Matter Enhanced Mobility of Nano Zerovalent Iron
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Natural Organic Matter Enhanced Mobility of Nano Zerovalent Iron

机译：天然有机物增强了纳米零价铁的迁移性

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摘要

Column studies showed that the mobility of nanometer-sized zerovalent iron (nZVI) through granular media is greatly increased in the presence of natural organic matter (NOM). At NOM concentrations of 20 mg/L or greater, the nZVI was highly mobile during transport experiments in 0.15-m long columns packed with medium sand. Below 20 mg/L NOM, mobility of the nZVI was less; however, even at 2 mg/L the nZVI showed significantly increased mobility compared to the no-NOM case. Spec-trophotometric and aggregation studies of nZVI suspensions in the presence of NOM suggest that sorption of the NOM onto the nZVI, resulting in a reduced sticking coefficient, may be the primary mechanism of enhanced mobility. Modeling the mobility of nZVI in porous media with filtration theory is challenging, but calibration of a simple model with experimental results from the column experiments reported here allows simulation of transport distances during injection. The simulation results show that the increased mobility due to NOM combined with the decrease in mobility due to decreased velocity with distance from an injection well could produce an injection zone that is wide enough to be useful for remediation but small enough to avoid reaching unwanted receptors.
机译：色谱柱研究表明，在存在天然有机物（NOM）的情况下，纳米级零价铁（nZVI）通过颗粒介质的迁移率大大提高。在NOM浓度为20 mg / L或更高时，nZVI在运输实验期间在装有中砂的0.15米长色谱柱中具有很高的流动性。低于20 mg / L NOM，nZVI的迁移率较小；但是，即使在2 mg / L的情况下，nZVI与no-NOM相比也显示出显着增加的迁移率。在存在NOM的情况下对nZVI悬浮液的分光光度和聚集研究表明，将NOM吸附到nZVI上会导致粘附系数降低，这可能是提高迁移率的主要机理。利用过滤理论对nZVI在多孔介质中的迁移率进行建模具有挑战性，但是使用此处报道的柱实验得到的实验结果对简单模型进行校准可以模拟进样过程中的传输距离。模拟结果表明，由于NOM导致的迁移率增加，以及由于速度降低而导致的迁移率降低，与注入井的距离成正比，因此注入区的宽度足以用于补救，但又足够小，可以避免到达不需要的受体。

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  • 来源
    《Environmental Science & Technology》 |2009年第14期|5455-5460|共6页
  • 作者

    RICHARD L. JOHNSON; GRAHAM OBRIEN JOHNSON; JAMES T. NURMI; PAUL G. TRATNYEK;

  • 作者单位

    Division of Environmental and Biomolecular Systems, Oregon Health & Science University, 20000 NW Walker Road, Beaverton, Oregon 97006;

    Division of Environmental and Biomolecular Systems, Oregon Health & Science University, 20000 NW Walker Road, Beaverton, Oregon 97006;

    Division of Environmental and Biomolecular Systems, Oregon Health & Science University, 20000 NW Walker Road, Beaverton, Oregon 97006;

    Division of Environmental and Biomolecular Systems, Oregon Health & Science University, 20000 NW Walker Road, Beaverton, Oregon 97006;

  • 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);
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  • 正文语种 eng
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