【摘要】 对北京西郊不同地点,土壤中汞吸附和迁移特性进行了实验研究。通过批次实验得到了汞的静态等温吸附系数。经过连续注入,得到了示踪离子(Br)和汞的穿透曲线。分别采用对流弥散模型(CDE)和两点非平衡吸附模型(TSN)对实验室土柱中的重金属迁移的动态行为进行了数值仿真模拟,并探讨了孔隙流速与阻滞因子的关系。通过模型的灵敏度分析,参数V、R、β控制着穿透时间,而ω则控制着穿透曲线的峰值。数值仿真研究表明:采用TSN模型对北京西郊重金属Hg的迁移行为进行研究更为合理。更多还原

【Abstract】 Laboratory experiments were performed to investigate the adsorption and transportation of mercury at different sites,western suburb of Beijing.Adsorption isotherms were determined through the batch experiment.Soil columns experiments were conducted in saturated soil under steady-state flow at a specific water head.The breakthrough curves(BTC) for tracer(bromine) and mercury were obtained after continuous input.Moreover,two solute transport models(convection-dispersion equation model(CDE) and two-site nonequilibrium model(TSN)) were used to simulate heavy metal movement through soil at the laboratory column scale.According to the difference of simulate results,the relationship between pore-water velocity and retardation factor was discussed preliminary.The coefficient V、R、β control the time of breakthrough,andω controls the peak value of breakthrough curves.The environment prediction model has been established for assessing heavy metal Hg transport in western suburb of Beijing.更多还原