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首页> 外文期刊>Environmental Science & Technology >Surface Roughness Impacts on Granular Media Filtration at Favorable Deposition Conditions: Experiments and Modeling
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Surface Roughness Impacts on Granular Media Filtration at Favorable Deposition Conditions: Experiments and Modeling

机译：有利沉积条件下表面粗糙度对颗粒介质过滤的影响：实验和建模

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摘要

Column tests were conducted to investigate media roughness impacts on particle deposition in absence of an energy barrier (i.e., high ionic strength). Media/collector surface roughness consistently influenced colloid deposition in a nonlinear, nonmonotonic manner such that a critical roughness size associated with minimum particle deposition could be identified; this was confirmed using a convection-diffusion model. The results demonstrate that media surface roughness size alone is inadequate for predicting media roughness impacts on particle deposition; rather, the relative size relationship between the particles and media/collectors must also be considered. A model that quantitatively considers media surface roughness was developed that described experimental outcomes well and consistently with classic colloid filtration theory (CFT) for smooth surfaces. Dimensionless-scaling factors f_(roughness) and f_(PCIF) were introduced and used to develop a model describing particle deposition rate (k_d) and colloid attachment efficiency (α). The model includes fitting parameters that reflect the impact of critical system characteristics such as ionic strength, loading rate, hydrophobicity. Excellent agreement was found not only between the modeled outcomes for colloid attachment efficiency (α) and experimental results from the column tests, but also with experimental outcomes reported elsewhere. The model developed herein provides a framework for describing media surface roughness impacts on colloid deposition.
机译：进行柱测试以研究在没有能垒（即高离子强度）的情况下介质粗糙度对颗粒沉积的影响。介质/收集器的表面粗糙度始终以非线性，非单调的方式影响胶体沉积，因此可以确定与最小颗粒沉积相关的临界粗糙度大小；使用对流扩散模型对此进行了确认。结果表明，仅介质表面粗糙度的大小不足以预测介质粗糙度对颗粒沉积的影响。相反，还必须考虑颗粒与介质/收集器之间的相对尺寸关系。开发了一种定量考虑介质表面粗糙度的模型，该模型很好地描述了实验结果，并且与光滑表面的经典胶体过滤理论（CFT）一致。引入了无因次缩放因子f_（粗糙度）和f_（PCIF），并用于建立描述颗粒沉积速率（k_d）和胶体附着效率（α）的模型。该模型包括拟合参数，这些参数反映了关键系统特性（如离子强度，负载率，疏水性）的影响。不仅在胶体附着效率（α）的建模结果与柱测试的实验结果之间找到了极好的一致性，而且在其他地方也报道了实验结果。本文开发的模型提供了一个框架，用于描述介质表面粗糙度对胶体沉积的影响。

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  • 来源
    《Environmental Science & Technology》 |2015年第13期|7879-7888|共10页
  • 作者

    Chao Jin; Stefano D. Normani; Monica B. Emelko;

  • 作者单位

    Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;

    Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;

    Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;

  • 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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