细河污染物在地下水中运移规律的模拟研究

Simulation Study on Transport Law of Contaminants Sourcing from Xihe in Groundwater

为了研究河水中污染物在地下水中运移规律,分析了细河污染对地下水的影响,根据细河水文地质条件建立了污染物在地下水中运移的2区动力学模型,对河水中氨氮、总硬度等组分在地下水中的运移规律进行了模拟研究。结果表明,随运移距离的增加,污染物浓度逐渐降低;地下含水层对河流中部分污染物具有较强的去除能力,如对氨氮、耗氧量的去除率可达98%以上;水分蒸发对部分污染物具有浓缩作用,地下水中总硬度等组分浓度逐渐升高,并高于污染源浓度。

In order to investigate the transport law of contaminant sourcing from Xihe in groundwater, the impact of the Xihe river water pollution to the groundwater was analyzed. A dual-domain model was developed to describe the transporting of contaminants in groundwater based on the hydrological geology condition, and the transport law of the contaminant in groundwater was simulated, such as ammonia nitrogen, total hardness, etc. The result showed that the concentration of contaminant reduced gradually with distance increasing to the river, the aquifer had high decontamination ability to the contaminant sourcing from the polluted river, and ammonia nitrogen and oxygen demand could be decreased by more than 98%. Due to moisture evaporation, some pollutants can be condensed, the concentration, such as total hardness, etc., rose gradually, and was higher than the source concentration.