尾矿氰化物渗漏对地下水污染的动力学模型

Numerical simulation of cyanide leakage from tailing on groundwater pollution

通过分析尾矿氰化物渗漏在土壤中迁移机制的基础上,建立了污染物运移过程的耦合动力学模型,模拟了不同时间内氰化物在包气带土层中浓度分布。数值模拟结果表明:氰化物渗漏对地下水污染将产生一定的影响,当降雨量增大时,污染物质可穿过包气带而污染地下水。同时,微生物降解作用对浓度在包气带土层分布也产生很大的影响,这对于定量化评价氰化物类污染物渗漏对地下水污染的潜在性影响提供了可靠的理论根据。

Based on the mechanism analysis for cyanide leakage in soil, a coupled dynamic numerical model of cyanide pollutants transportation and transformation is developed, which includes the variably saturated flow and pollutants transport governing equations. The model accounts for the dynamic behavior in relation to sorption-desorption, biodegradation, and concentration of pollutants. The numerical model is utilized to predict the temporal and spatial distribution features of contaminant concentration in unsaturated soil. The simulation results show the cyanide leakage has a large impact on the groundwater pollution. Under certain rainfall conditions, the pollutants break through the unsaturated zone into groundwater aquifer. The biodegradation decay has effected the cyanide concentration distribution. It provides theoretical evidence for quantitative assessment of potential effects of cyanide pollutants transport on groundwater pollution, and the science evidence and method are provided for controlling pollutants and prevention measurer in process of tailing exploitation.