铜离子在尾矿库坝体中迁移数值模拟

Numerical Simulation of Copper Ion Migration in Dam body of Tailings Pond

为了查明重金属污染物在某尾矿库坝体中迁移情况并做出影响性预测,采用数值实验对该重金属尾矿库进行模拟计算,概化尾矿库坝体条件,建立地下水流动模型与地下水污染物(以尾矿浸出液中铜离子为例)迁移模型,利用TOUGH2软件模拟计算得出各个时刻铜离子污染物在坝体中的分布状态。模拟计算结果表明,铜离子污染物在地下水流场中运移以扇形向周围扩散,铜离子污染物在坝体中的运动规律符合地下水流场特征;随着时间的推移,运移范围在坝体内逐渐扩大;随着运移距离的增大,污染物浓度逐渐减小;在2750 d时,铜离子出露于坝体进入自然环境,并产生影响。结果为尾矿库周边环境污染防治措施提供了依据。

In order to find out the migration of heavy metal pollutants in the dam body of tailings pond and make impact predictions,the heavy metal tailings pond is simulated by numerical experiments,the tailings pond dam conditions are generalized,and the groundwater flow model and groundwater contaminant(copper ions in tailings leachate as example)migration model are established.Through TOUGH2 software simulation calculation,the distribution of copper ion pollutants in the dam body at each moment is obtained.The simulation results show that the copper ion pollutants migrate in the groundwater flow field and diffuse in the fan shape,the movement law of copper ion pollutants in the dam body is consistent with the groundwater flow field characteristics.With the passage of time,the migration range gradually expands in the dam body,and as the migration distance increases,the pollutant concentration gradually decreases.At 2,750 d,copper ions emerged from the dam into the natural environment and began to affect the environment.The results provide a basis for environmental pollution control and prevention measures around the tailings pond.