文章基本信息

标题：A MODEL TO DESCRIBE THE NONLINEAR ADSORPTION AND DESORPTION BEHAVIOR DURING THE PROCESS OF CONTAMINANT TRANSPORT
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作者：Zhiguang Guo ; Bing Bai
期刊名称：Fresenius Environmental Bulletin
印刷版ISSN：1018-4619
出版年度：2017
卷号：26
期号：11
页码：6571-6578
语种：English
出版社：PSP Publishing
摘要：In this paper, a theoretical model to describe the non-linear adsorption-desorption behavior of contaminant transport is proposed basing on the experiment of suspended particles penetrating soil column. The model takes into account the non-linear variation of the adsorption concentration with the solute concentration during the migration of pollutants. A numerical examples is given to demonstrate the correctness of the model, which shows that the amount of contaminant adsorbed and the peak value of the breakthrough increases with the decrease of desorption equilibrium constant, however, the peak value occurrence time is relatively lagged. The fitting results obtained by the least squares method are in good agreement with the results of soil column penetration test. Results show that when the seepage velocity becomes smaller, the desorption equilibrium coefficient gradually decreases and the adsorption capacity increases gradually, while the adsorption equilibrium coefficient changes little, at about 0.09 cm3/g. In addition, the concentration of injection and the velocity of the percolation have little effect on the dispersion. The dispersion of suspended particles in saturated porous media is about 0.5 cm in the case of short time injection.
关键词：contaminant migration;nonlinear adsorption-desorption;soil column penetration test;porous media;migration process;unsteady flow