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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 cm(3)/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.
- 出版日期2017
- 单位北京交通大学
