Colloidal transport and deposition through dense vegetation
Colloidal transport and deposition through dense vegetation
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通过茂密植被的胶体运输和沉积
DOI：
10.1016/j.chemosphere.2021.132197
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发表时间：
2022
期刊：
影响因子：
8.8
通讯作者：
Li, Ying
中科院分区：
文献类型：
--
作者：
Yu, Congrong;Duan, Peiyi;Barry, D.A.;Johnson, William P.;Chen, Li;Yu, Zhongbo;Sun, Yufeng;Li, Ying
研究了沉水人工水生植被对流动水体中胶体的去除效果，以探讨水体对颗粒非点源污染物的截留作用。在胶体运移实验中，胶体在密集植被中的沉积速率系数常被视为空间常数。这一假设进行了测试的实验和建模，旨在量化的胶体保留与行驶距离在淹没合成水生植被的变化。实验是在一个10米长，0.6米宽的水槽中进行的，水深为5厘米，在不同的流体速度，初始胶体浓度，和溶液的pH值。一个模型占平流，分散和一阶动力学沉积描述的实验数据。胶体沉积速率系数随行程的增加呈幂律下降，在水槽末端达到一个稳定值。测量的胶体性质的变化与运输距离（超电势和大小）不能解释所观察到的减少。虽然重力被证明有助于减少，它的影响太弱，无法解释递减的幂律趋势，这表明在粒状介质中运行的过程产生类似的结果也可能适用于沉水植被。
The effectiveness of submerged synthetic aquatic vegetation on removal of colloids from flowing water was investigated to explore retention of particulate nonpoint source pollutants in aquatic systems. In colloid transport experiments, the deposition rate coefficient of colloids in dense vegetation is often taken as spatially constant. This assumption was tested by experiments and modeling aimed at quantifying changes in colloid retention with travel distance in submerged synthetic aquatic vegetation. Experiments were performed in a 10-m long, 0.6-m wide flume with a 5-cm water depth under different fluid velocities, initial colloid concentrations, and solution pH values. A model accounting for advection, dispersion and first-order kinetic deposition described the experimental data. The colloid deposition rate coefficient showed a power-law decrease with travel distance, and reached a steady state value before the end of the flume. Measured changes in colloid properties with transport distance (ζ potential and size) could not explain the observed decrease. While gravity was shown to contribute to the decrease, its impact was too weak to explain the decreasing power law trend, suggesting that processes operating in granular media to produce similar outcomes may also apply to submerged vegetation.