海积平原区某非正规垃圾填埋场地下水氨氮污染模拟研究

本研究结合天津市海积平原区水文地质条件,构建了某非正规垃圾填埋场地下水溶质运移模型,并将该模型用于预测分析垃圾填埋场地下水氨氮污染迁移规律.采用敏感性分析研究了渗透系数、孔隙度和弥散度等参数的变化对模拟结果的影响.模拟评价了地下水氨氮污染抽出处理效果.研究结果表明,氨氮污染羽在10年内最大迁移距离为648 m,污染面积达到368667 m~2,高浓度氨氮污染羽主要分布于南部浅层潜水含水层.抽出处理方案效果不佳,易导致氨氮污染羽的拖尾和反弹效应.本研究可为海积平原区地下水氨氮污染治理、修复提供理论参考和依据.

Simulation study about ammonia nitrogen pollution of groundwater in an informal landfill site in the sea plain area

Based on the hydrogeological conditions in the sea plain area of Tianjin, this study builds a solute transport model of groundwater in an informal landfill site, which is used to predict and analyze the law of ammonia nitrogen pollution transport of groundwater in the landfill site. The influence of permeability coefficient, porosity and dispersion on the simulation results was studied by sensitivity analysis. The effect of extraction treatment of ammonia nitrogen pollution in groundwater was evaluated by simulation. The results show that the maximum migration distance of ammonia nitrogen pollution plume in 10 years is 648 m, the pollution area reaches 368667 m², and the high concentration of ammonia nitrogen pollution plume is mainly distributed in the shallow diving aquifer in the south. The effect of extraction treatment scheme is not good, which easily leads to the trailing and rebound effect of ammonia nitrogen pollution plume. This study can provide theoretical reference and basis for the treatment and remediation of ammonia nitrogen pollution in groundwater in the sea plain area.