焦作地区浅层地下水铬(Ⅵ)污染机理及迁移预测  

Pollution mechanism and migration prediction of Cr(Ⅵ) in shallow groundwater in Jiaozuo area

作　　者：焦芳芳[1] 马振民[1] 侯玉松[1] 

机构地区：[1]济南大学资源与环境学院山东省地下水数值模拟与污染控制工程技术研究中心,山东济南250022

出　　处：《煤田地质与勘探》2014年第6期82-86,96,共6页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41101530;31270586);国家高技术研究发展计划(863计划)项目(2012AA061705)

摘　　要：通过对焦作地区浅层地下水中铬(Ⅵ)污染物分布特征进行调查,分析了研究区浅层地下水中铬(Ⅵ)的污染机理,并运用Visual MODFLOW建立地下水流模型及溶质运移模型,模拟预测了浅层地下水中铬(Ⅵ)的迁移规律。结果表明:研究区浅层地下水铬(Ⅵ)污染严重,污染源是位于老君庙西南方向的焦作某电厂堆灰场,主要原因是露天堆放的粉煤灰中的铬(Ⅵ)污染物在长期淋滤作用下下渗污染含水层。气候条件、包气带岩性、地下水化学环境以及人为因素等也间接使浅层地下水铬(Ⅵ)浓度升高;模拟结果显示在未来的五年时间内,受地形和地下水动力场的影响,浅层地下水中铬(Ⅵ)的迁移方向与地下径流方向一致,沿大沙河水流方向上扩散速度更快,污染区域面积逐渐增大。Based on the investigation of the distribution characteristics of pollutant Cr（VI） in the shallow groundwaterof Jiaozuo area, the paper analyzed the polluting mechanism of Cr（VI）. The groundwater flow model andsolute transport model were established with Visual MODFLOW software and using the model simulation,migration prediction of Cr（VI） pollutants in the shallow groundwater was accomplished. The results show that inthe shallow groundwater of the study area, Cr（VI） pollution is very serious. The source of the pollution is theashery of a power plant located in the southwest of Laojunmiao in Jiaozuo. The main pollution reason is that underthe long-term leaching effect, Cr（VI） pollutants of fly ash piled up in the open air infiltrated and polluted theaquifer. The climate, the lithology of aeration zone, the groundwater chemical environment and human factors arethe indirect causes of the increasing concentration of Cr（VI） of the shallow groundwater in this area. Simulationresults show that in the next five years, influenced by landform and groundwater dynamic field, migration directionsof Cr（VI） pollutants in the shallow groundwater are consistent with groundwater flow directions. The diffusion ratealong the flow direction of Dasha river is more faster ,and the pollution area increases gradually with time.

关 键 词：浅层地下水 铬(Ⅵ) 污染机理 迁移预测 焦作地区 

分 类 号：X523[环境科学与工程—环境工程]