新邱矿矸石山淋滤液对地下水污染的数值模拟研究

Simulation Analysis on the Pollution of Coal Gangue Leachate to Groundwater in Xinqiu

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,建立了淋滤液在地下水中运移的耦合动力学数学模型,采用有限元方法进行数值求解,利用该数值模型对淋滤液在地下水中迁移行为进行模拟,预测了污染物浓度的时空分布特征,并结合实际观测数据进行对比分析。结果表明:不同组分由于各自特征的巨大差异,污染程度也有很大差别;淋滤液浓度拟合误差小于6%,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:吸附解吸、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。

According to the pollution of the coal gangue leachate to the groundwater in Xinqiu coal mining area, the coupled numerical model is developed for the simulation of the leachate transport in groundwater. The model is solved by using finite-element method, and the process of the coal gangue leachate in the groundwater is simulated. The temporal and spatial distribution features of the contaminant concentration are forecasted. The results indicate that the concentration distribution of contaminants has great difference with the great difference of the features of the contaminants. The average error of the leachate concentration is less than 6%, which is verified the model is reliable and practical. The simulation results also show that the distribution of the solute is diluted by the sorption-desorption and the biodegradation reaction. To some extent, the groundwater system is purified.