Study On Characteristics Of Contaminants Transferring In Soil And Groundwater From Landfill Leachate And Its Prevention

According to infiltration experiments on soil sampled from Datong landfill site in Huainan, conclusion can be drawn that the linear relationship between landfill site soil's hydraulic conductivity and porous proportion is better as e³/(1+e), and the value of soil's hydraulic conductivity increases with concentration of ion in leachate. Through the experiments on leachate and polluted different water bodies, it was found out that while diluting the concentration of leachate, soil's ability to absorb Ca²⁺, Mg²⁺, SO₄^2- in leachate will strengthen gradually;deep soil's ability to absorb Ca²⁺, Mg²⁺, SO₄^2- in leachate is larger than shallow soil's. Deep soil's ability to absorb ammonia-nitrogen in leachate is larger than shallow soil's. By diffusion equation of leachate and through calculating, some conclusions are made: concentration of contaminative ion decreases with time within pollution source area, and the far from the center, the more concentration of contaminative ion decreases, besides outside the pollution source area, concentration of contaminative ion increases with time gently, converging to a certain value in the end. Based on preceding experiments, combined with geographical and hydrogeologic characters of the researched field, using Visual-Modflow software contaminative ion transportation and were process in the shallow groundwater simulated. Corresponding measure were put forward to prevent and cure leachate contamination, moreover, under different remedial scenarios, transportation of contaminative ion was simulated. What has been above provides an important reference for the engineering design of Datong landfill site and remedy for soil and groundwater. So, this research has some significance for contaminated soil and groundwater.