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首页> 外文期刊>Environmental Science & Technology >Single Collector Attachment Efficiency of Colloid Capture by a Cylindrical Collector in Laminar Overland Flow
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Single Collector Attachment Efficiency of Colloid Capture by a Cylindrical Collector in Laminar Overland Flow

机译：层状地表径流中圆柱形收集器捕获胶体的单收集器附着效率

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摘要

Little research has been conducted to investigate the fate and transport of colloids in shallow overland flow through dense vegetation under unfavorable chemical conditions. In this work, the single collector attachment efficiency (a) of colloid capture by a simulated plant stem (i.e., cylindrical collector) in laminar overland flow was measured directly in laboratory flow chamber experiments. Fluorescent microspheres of two sizes were used as experimental colloids. The colloid suspensions flowed toward a glass cylindrical rod installed in a small size flow channel at different laminar flow rates. Different solution ionic strengths (IS) were used in the experiments to simulate unfavorable attachment conditions. Our results showed that α increased with IS and decreased with flow velocity. Existing theoretical and empirical models of colloid attachment efficiency for porous media were used to simulate the experimental measurements in α and found to fall short in matching the experimental data. A new dimensionless (regression) equation was proposed that predicts the α of colloid capture by a cylindrical collector in laminar overland flow with reasonable accuracy. In addition, the equation was also effective in predicting the attachment efficiency of colloid deposition in porous media.
机译：在不利的化学条件下，很少有研究调查通过稠密植被的浅陆流中胶体的命运和运输。在这项工作中，在实验室流动室实验中直接测量了模拟植物茎（即圆柱形收集器）在层流陆上流动中对胶体的单个收集器附着效率（a）。使用两种尺寸的荧光微球作为实验胶体。胶体悬浮液以不同的层流速率流向安装在小尺寸流道中的玻璃圆柱棒。实验中使用了不同的溶液离子强度（IS）来模拟不利的附着条件。我们的结果表明，α随IS增加而随流速降低。现有的多孔介质胶体附着效率的理论和经验模型用于模拟α中的实验测量结果，发现与实验数据不符。提出了一个新的无量纲（回归）方程，该方程以合理的精度预测了层状陆上水流中圆柱形收集器对胶体的捕获。此外，该方程还可以有效预测胶体在多孔介质中的附着效率。

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  • 来源
    《Environmental Science & Technology》 |2012年第16期|p.8878-8886|共9页
  • 作者

    Lei Wu; Bin Gao; Rafael Munoz-Carpena; Yakov A. Pachepsky;

  • 作者单位

    Department of Agricultural and Biological Engineering, University of Florida, Gainesville, Florida 32611, United States;

    Department of Agricultural and Biological Engineering, University of Florida, Gainesville, Florida 32611, United States;

    Department of Agricultural and Biological Engineering, University of Florida, Gainesville, Florida 32611, United States;

    USDA-ARS, Environmental Microbial Safety Laboratory, 10300 Baltimore Avenue, Building 173, Bare-East, Beltsville, Maryland 20705, 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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