Study on the Influence of Solid Medium Adsorption on the Migration and Transformation of Chlorinated Hydrocarbons in the Groundwater System

In this paper, the pollution of chlorinated hydrocarbons in the groundwater system is taken as the main research object. According to the adsorption characteristics of chlorinated hydrocarbons in different aquifer media, carbon tetrachloride is taken as an example to carry out isothermal adsorption experiments under different solid medium conditions. The concentration data are obtained by fitting the standard curves of linear, Langmuir, Freundlich, and Temkin types to study the mechanism of chlorinated hydrocarbons in different media. The results show that the adsorption capacity of silty clay is greater than that of limestone at the same initial concentration. Therefore, before the pollutants enter the karst water, the silty clay will “intercept” the pollutants. However, once the karst water is polluted, the limestone medium has a small adsorption capacity, which will bring difficulties to pollution control and treatment.