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针对铬渣堆场周边地下水严重污染问题,以辽宁锦州铬渣堆场为研究对象,基于渗流理论和溶质运移理论,建立铬渣渗滤液中Cr(Ⅵ)在地下水系统中运移的耦合动力学数学模型,通过动态土柱实验测定了渗透系数、水动力弥散系数、吸附分配系数和迟滞因子等模型参数,运用Visual modflow软件对采取防渗措施前20年和防渗后30年Cr(Ⅵ)在地下水系统中的迁移变化规律进行了数值仿真分析,并结合现场地下水监测数据进行了可靠性验证.结果表明:防渗前附近2 km村庄地下水都受到不同程度污染,防渗后污染物浓度的下降具有滞后性,体现对流和弥散作用是Cr(Ⅵ)在地下水中污染运移的主要作用,而吸附解吸作用同样不容忽视.数值模拟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,为定量化研究铬渣堆场区域地下水污染提供可靠参考依据.
In view of the serious pollution of groundwater around the chrome slag yard, the chromium (Cr) residue in Jinzhou, Liaoning Province is taken as the research object. Based on seepage theory and solute transport theory, a coupling dynamic of Cr (Ⅵ) in groundwater is established Mathematical model was established. The parameters of permeability, hydrodynamic dispersion coefficient, adsorption partition coefficient and hysteresis factor were determined by dynamic soil column test. Visual modflow software was used to analyze the effect of Cr (Ⅵ ) In the groundwater system was simulated by numerical simulation and the reliability of the groundwater monitoring data was verified.The results showed that the groundwater in 2 km near the village before seepage prevention was all polluted to varying degrees and the pollutant concentration after seepage control , The convection and dispersion are the main roles of Cr (Ⅵ) in polluted groundwater transport, and adsorption and desorption can not be neglected.The numerical simulation results are in good agreement with the monitoring results, which verifies the reliability of the model And practicality, which can provide a reliable reference for the quantitative research of groundwater pollution in the area of chromium residue yard.