The numerical simulation of pollutants transport through landfill liner under coupling of temperature and chemical osmotic pressure

On the basis of convection, dispersion and non-linear adsorption, the numerical model of pollutants migration through landfill liner was established under coupling of temperature and chemical osmotic pressure. The numerical model was used to predict pollutant migration through landfill liner. The sensitivity of the relevant parameters was analyzed. The results showed that the Cr(VI) gradually extended to the landfill liner with increasing of time, and Cr(VI) transport has a significant delay phenomenon with increasing of soil thickness. As hydraulic conductivity and dispersion coefficients increased, the Cr(VI) transport significantly speeded up. Hence, they are main factors of the pollutants transport. The effect of soil specific heat and thermal conductivity to Cr(VE) transport is not obvious. The study has a very important significance for preventing landfill leachate pollution on the surrounding environment and desgin of landfill liner.