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首页> 外文期刊>Environmental Science & Technology >Colloid Filtration in Surface Dense Vegetation: Experimental Results and Theoretical Predictions
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Colloid Filtration in Surface Dense Vegetation: Experimental Results and Theoretical Predictions

机译：表面致密植被中的胶体过滤：实验结果和理论预测

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摘要

Understanding colloid and colloid-facilitated contaminant transport in overland flow through dense vegetation is important to protect water quality in the environment, especially for water bodies receiving agricultural and urban runoff. In previous studies, a single-stem efficiency theory for rigid and clean stem systems was developed to predict colloid filtration by plant stems of vegetation in laminar overland flow. Hence, in order to improve the accuracy of the single-stem efficiency theory to real dense vegetation system, we incorporated the effect of natural organic matter (NOM) on the filtration of colloids by stems. Laboratory dense vegetation flow chamber experiments and model simulations were used to determine the kinetic deposition (filtration) rate of colloids under various conditions. The results show that, in addition to flow hydrodynamics and solution chemistry, steric repulsion afforded by NOM layer on the plants stem surface also plays a significant role in controlling colloid deposition on vegetation in overland flow. For the first time, a refined single-stem efficiency theory with considerations of the NOM effect is developed that describes the experimental data with good accuracy. This theory can be used to not only help construct and refine mathematical models of colloid transport in real vegetation systems in overland flow, but also inform the development of theories of colloid deposition on NOM-coated surfaces in natural, engineered, and biomedical systems.
机译：了解胶体和胶体促进的污染物通过茂密植被在陆上流动中的运输对于保护环境中的水质非常重要，特别是对于接受农业和城市径流的水体而言。在先前的研究中，开发了用于刚性和清洁茎系统的单茎效率理论，以预测层状陆地流中植被的植物茎对胶体的过滤作用。因此，为了提高单茎效率理论对真实茂密植被系统的准确性，我们结合了天然有机物（NOM）对茎过滤胶体的影响。实验室密集的植被流动室实验和模型模拟用于确定各种条件下胶体的动力学沉积（过滤）速率。结果表明，除水流动力学和溶液化学作用外，植物茎表面NOM层提供的空间排斥力在控制陆流中植被胶体沉积中也起着重要作用。首次开发了一种考虑了NOM效应的改进的单杆效率理论，该理论以良好的精度描述了实验数据。该理论不仅可以用来帮助建立和完善胶体在陆上水流中的真实植被系统中的运移数学模型，而且可以为自然，工程和生物医学系统中胶体在NOM涂层表面上的沉积理论的发展提供参考。

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  • 来源
    《Environmental Science & Technology》 |2014年第7期|3883-3890|共8页
  • 作者

    Lei Wu; Rafael Munoz-Carpena; Bin Gao; Wen Yang; 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;

    Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W. Green St., Urbana, Illinois 61801, 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);
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