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首页> 外文期刊>Environmental Science & Technology >Nonmonotonic Variations in Deposition Rate Coefficients of Microspheres in Porous Media under Unfavorable Deposition Conditions
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Nonmonotonic Variations in Deposition Rate Coefficients of Microspheres in Porous Media under Unfavorable Deposition Conditions

机译：不利沉积条件下多孔介质中微球沉积速率系数的非单调变化

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摘要

The transport of carboxylate-modified polystyrene latex microspheres was examined in packed quartz sand under a variety of environmentally relevant ionic strength and flow conditions. The retained concentrations of microspheres in the sediment increased first, and then decreased with transport distance, indicating that the deposition rate coefficient changed nonmonotonically over the transport distance. This finding demonstrates the ubiquity of spatial variation in deposition rate coefficients under unfavorable deposition conditions, and in addition indicates that the previously recognized monotonic decrease with transport distance is not the sole form of spatial variations in deposition rate coefficients. In contrast, the deposition rate coefficients of similarly sized microspheres with different surface group densities were shown to decrease monotonically with transport distance in the same porous media, indicating that the form of spatial variation in deposition rate coefficient is highly sensitive to system conditions. The ubiquity and sensitivity of the spatial variation of deposition rate coefficients indicate that current practices that utilize log-linear extrapolation of discreet measurements of colloid attenuation to determine colloid removal with distance from source are not valid (for both biological and nonbiological colloids). The retained colloid profiles hold the promise to reveal processes governing colloid deposition under unfavorable conditions that are yet to be identified.
机译：在各种环境相关的离子强度和流动条件下，在填充的石英砂中检查了羧酸盐改性的聚苯乙烯胶乳微球的运输。沉积物中微球的保留浓度首先增加，然后随运输距离而降低，这表明沉积速率系数在运输距离上非单调变化。这一发现表明，在不利的沉积条件下，沉积速率系数的空间变化无处不在，此外，表明先前公认的随运输距离的单调下降并不是沉积速率系数空间变化的唯一形式。相反，在相同的多孔介质中，具有不同表面基团密度的尺寸相似的微球的沉积速率系数随传输距离单调降低，表明沉积速率系数的空间变化形式对系统条件高度敏感。沉积速率系数空间变化的普遍性和敏感性表明，当前利用胶体衰减的离散测量的对数线性外推法确定胶体与源之间距离的去除是无效的（对于生物胶体和非生物胶体）。保留的胶体轮廓有希望揭示在尚未确定的不利条件下控制胶体沉积的过程。

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