Optimization of Pollution Remediation Plan in Rare Earth Mining Area Based on Numerical Simulation of Groundwater
By constructing a numerical model of groundwater flow in an ionic rare earth mining area,the flow field and run-off characteristics of groundwater were simulating and predicting.The design scheme for groundwater pollution remediation was thus optimized based on the prediction results of flow field and streamline.According to the optimized results,the length of the grout curtain was adjusted from 160 m to 95 m,and the depth was adjusted from 20 m to 0.5 m below the relative water-proof layer,and the top line was adjusted from the surface to 114 m elevation.The injection wells of in-situ chemical coupled microbial remediation engineering were adjusted from uniform layout to centralized layout in heavily polluted areas,ensuring that all groundwater in the remediation period can flow through the injection area.The length of the permeable reactive barri-ers was adjusted from 56 m to 41.5 m,the depth of the grout wall was increased to 0.5 m below the relative waterproof layer,and the top line elevation extended from the bottom of the repair unit to 101.4 m.Considering the amount of groundwater over-flow in the mining area,the scale of ecological ditch treatment was adjusted from 232 m3/d to 262 m3/d.After optimization,groundwater pollution remediation scheme was more scientific,reasonable,and low-cost,which has great reference signifi-cance for the formulation of similar groundwater pollution remediation schemes.
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