Organoclays for soil remediation: Adsorption of 2,4-dichlorophenol on organoclay/aquifer material mixtures studied under static and flow conditions

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• 作者：Timea Pernyeszi ; Roy Kasteel ; Barbara Witthuhn ; Peter Klahre ; Harry Vereecken and Erwin Klumpp
• 关键词：Organoclay ; Chlorophenol ; Adsorption ; Column technique ; Numerical modelling ; Reactive barrier
• 刊名：Applied Clay Science
• 出版年：2006
• 出版时间：May 2006
• 年：2006
• 卷：32
• 期：3-4
• 页码：179-189
• 全文大小：400 K

文摘

A column material containing organophilic clay particles was developed for soil remediation. 2,4-dichlorophenol adsorption on aquifer material with an effective particle diameter d < 1 mm and various partially modified dioctadecyldimethylammonium–montmorillonite/aquifer material mixtures were studied under static and flow conditions. The 2,4-dichlorophenol adsorption on the aquifer material was negligible. On organoclay/aquifer material mixtures the adsorption capacity increased with increasing organoclay content and the adsorption isotherms could be fitted by the Freundlich equation. In columns filled with organoclay/aquifer material mixtures, the 2,4-dichlorophenol retardation increased with increasing organoclay content up to 1 % (w / w). Above 1.5–2.0 % (w / w) the permeability of the column material decreased. The HYDRUS_1D model, which solves the convection–dispersion equation for solute transport, was used in a forward and inverse mode to simulate 2,4-dichlorophenol breakthrough in the columns. The simulations revealed that 2,4-dichlorophenol transport exhibited an additional kinetic effect not observed in the batch experiments.