Nonideal transport of contaminants in heterogeneous porous media: 8. Characterizing and modeling asymptotic contaminant-elution tailing for several soils and aquifer sediments.
Nonideal transport of contaminants in heterogeneous porous media: 8. Characterizing and modeling asymptotic contaminant-elution tailing for several soils and aquifer sediments.
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DOI：
10.1016/j.chemosphere.2010.07.018
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发表时间：
2010-09
期刊：
影响因子：
8.8
通讯作者：
Brusseau ML
中科院分区：
文献类型：
--
作者：
Russo A;Johnson GR;Schnaar G;Brusseau ML
进行混相置换实验，以表征长期，低浓度洗脱拖尾与吸附/解吸过程。各种土壤和含水层沉积物，代表了一系列的颗粒大小分布和有机碳含量，被雇用，三氯乙烯（TCE）被用作模型有机化合物。三氯乙烯运输表现出广泛的洗脱拖尾所有媒体，几百到几千孔体积的水冲洗需要达到检测限。对于有机碳含量较高和相关阻滞因子的介质，洗脱拖尾更广泛。然而，当归一化延迟，拖尾的程度并不直接相关的有机碳含量。这些后一结果表明，有机碳的地球化学性质的差异（例如，组成，结构）之间的各种媒体影响观察到的行为。一个数学模型，结合非线性，速率限制的吸附/解吸描述的连续分布函数被用来成功地模拟三氯乙烯的传输，包括广泛的洗脱拖尾。
Miscible-displacement experiments were conducted to characterize long-term, low-concentration elution tailing associated with sorption/desorption processes. A variety of soils and aquifer sediments, representing a range of particle-size distributions and organic-carbon contents, were employed, and trichloroethene (TCE) was used as the model organic compound. Trichloroethene transport exhibited extensive elution tailing for all media, with several hundred to several thousand pore volumes of water flushing required to reach the detection limit. The elution tailing was more extensive for the media with higher organic-carbon contents and associated retardation factors. However, when normalized by retardation, the extent of tailing did not correlate directly to organic-carbon content. These latter results suggest that differences in the geochemical nature of organic carbon (e.g., composition, structure) among the various media influenced observed behavior. A mathematical model incorporating nonlinear, rate-limited sorption/desorption described by a continuous distribution function was used to successfully simulate trichloroethene transport, including the extensive elution tailing.
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