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以溶质运移理论为基础,针对阜新市新邱露天煤矿煤矸石淋滤液对地下水污染实际情况,分析了煤矸石渗滤液在含水层中运移的规律,在综合考虑对流扩散、吸附解吸、生物降解条件下建立了淋滤液在地下水中运移的耦合动力学数学模型,采用Galerkin有限元方法和Picard迭代法相结合对耦合模型进行了离散,模拟了淋溶液对地下水污染的动态过程,预测了污染浓度的时空分布特征,并结合实际观测数据进行对比.结果表明:污染面积随时间推移不断扩大,且纵向扩散显著;不同组分(Ca2++Mg2+、SO42-、Cl-)由于各自特征的巨大差异,污染程度也有很大差别;污染物浓度变化趋势及计算值与监测结果基本吻合,从而验证了模型的可靠性和实用性.此外,从模拟结果中发现:生物降解对淋滤液在地下水中的分布起到了稀释作用,在一定程度上净化了地下水系统.图3,表2,参8.
Based on the solute transport theory, aiming at the actual situation of coal gangue leachate from Xinqiu surface coal mine in Fuxin City, the rule of coal gangue leachate migration in aquifer was analyzed. Considering the effects of convective diffusion, adsorption and desorption, The coupled dynamic mathematical model of leachate migration in groundwater was established under degradation conditions. The coupled model was discretized using the Galerkin finite element method and the Picard iterative method. The dynamic process of leaching solution to groundwater pollution was simulated and the pollution was predicted The results show that: the pollution area expands with the passage of time, and the longitudinal diffusion is significant; the different components (Ca2 + + Mg2 +, SO42-, Cl-) due to their huge characteristics Differences and pollution levels are also very different; trends and calculated values of pollutant concentrations are basically consistent with the monitoring results, thus verifying the reliability and practicability of the model.Furthermore, it is found from the simulation results that biodegradation of leachate in groundwater The distribution played a dilution effect, to some extent purify the groundwater system Figure 3, Table 2, reference 8.