A mathematical model based on conceptual equilibrium has been devised to study the role of mobile-immobile sorbents on colloid-facilitated contaminant transport through a two-dimensional, saturated, and homogeneous groundwater system with transient flow conditions. The primary drawback of the kinetic model arises from its inability to handle the large number of parameters involved in multi-dimensional regions at bigger scales when several transport processes and transient flow conditions are included. In order to prevent model complexity, the current study is the first attempt to investigate the equilibrium approach with transient flow conditions in a two-dimensional domain. Conventionally, colloids enhance the contaminant transport by adsorbing contaminants through multiple sorption reactions. However, it was noticed that even in the presence of colloids (Cc=100mg/l), BTCs get attenuated due to an increase in k3, which indicates a stronger affinity of pollutants with the static solid matrix. Therefore, the present study suggests that the mere existence of colloids may not guarantee enhanced contaminant movement. A contaminant plume with 50 mg/l of colloids travels 2 m ahead of the contaminant without colloids, and this distance increases to 4.7 m for 100 mg/l colloids. Therefore, colloids can either be favorable in the case of contaminated aquifer rehabilitation or adverse in the event of groundwater contamination spread.

中文翻译：

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移动式固定吸附剂对流动和胶体促进污染物通过多孔介质的传输的作用：二维建模


已经设计了一个基于概念平衡的数学模型，以研究移动不动吸附剂对胶体促进污染物通过具有瞬态流动条件的二维、饱和和均匀地下水系统进行迁移的作用。动力学模型的主要缺点是，当包括多个传输过程和瞬态流动条件时，它无法在更大尺度上处理多维区域中涉及的大量参数。为了防止模型复杂化，本研究首次尝试在二维域中研究瞬态流动条件的平衡方法。传统上，胶体通过多次吸附反应吸附污染物来增强污染物传输。然而，人们注意到，即使在胶体 （Cc=100mg/l） 存在的情况下，BTC 也会因 k3 的增加而衰减，这表明污染物与静态固体基质的亲和力更强。因此，本研究表明，仅存在胶体可能无法保证增强的污染物移动。含有 50 mg/l 胶体的污染物羽流比不含胶体的污染物领先 2 m，对于 100 mg/l 胶体，此距离增加到 4.7 m。因此，胶体在受污染含水层修复的情况下可能是有利的，在地下水污染扩散的情况下可能是不利的。