废石淋滤液对地下水质的影响预测——以西南地区某铁矿废石场为例  

Prediction of the Influence of Waste Rock Leachate on Groundwater Quality——A Case Study of an Iron Mine Waste Rock Field in Southwest China

作　　者：唐宏智 席英伟 蒋梅 张静 TANG Hong-zhi;XI Ying-wei;JIANG Mei;ZHANG Jing(Sichuan Jiashengyu Environmental Protection Engineering Co.Ltd,Chengdu 610091,China;Sichuan Environmental Monitoring Center,Chengdu 610091,China;College of Environment Sciences,Sichuan Agricultural University,Chengdu 610091,China)

机构地区：[1]四川嘉盛裕环保工程有限公司,成都610091 [2]四川省生态环境监测总站,成都610091 [3]四川农业大学环境学院,成都610091

出　　处：《四川环境》2020年第5期73-81,共9页Sichuan Environment

摘　　要：脆弱的地下水环境若遭到了矿山开采废石淋滤液污染,难以治理到恢复原状。以西南地区某铁矿废石场为研究对象,基于研究区水文地质概念模型,采用地下水MGWT软件(Matlab Groundwater Tools)模拟研究区地下水稳定流场及污染物(Fe、Pb、Cd)在地下水中的迁移。数值模拟结果表明,废石场底部防渗层出现10%破损的工况条件下,污染物的运移方向与地下水流方向基本一致,Fe、Pb、Cd 3种污染物都出现不同程度的超标,并在地下水下游方向形成污染晕;在废石场防渗层破损10年后,因地下水运动缓慢,Fe、Pb、Cd的污染晕依然存在,除Pb离子超标外,Fe、Cd离子浓度可满足《地下水质量标准》(GB14848-2017)中Ⅲ类标准限制要求。If the fragile groundwater environment is polluted by the leachate from mining waste rock,it is difficult to recover to the original condition.In this paper,based on the hydrogeological concept model,using groundwater MGWT software(Matlab Groundwater Tools)to simulate the groundwater stable flow fields and the migration of pollutants(Fe、Pb、Cd)in the groundwater in the research area.The results of numerical simulation showed that under the condition of 10%damage to the impermeable layer at the bottom of the waste rock field,the migration direction of pollutants was basically consistent with the direction of the underground water flow,Fe,Pb and Cd all exceed the standard in different degrees,and the pollution halo is formed in the downstream direction of groundwater.10 years after the failure of the impervious layer in the waste rock field,the pollution halo of Fe,Pb and Cd still exists due to the slow movement of groundwater.Except for the excessive Pb ions,the concentration of Fe and Cd ions can meet the limitation requirements of Class III standard in the Groundwater Quality Standard(GB14848-2017).

关 键 词：数值模拟 有限差分法 地下水污染 溶质运移 

分 类 号：X52[环境科学与工程—环境工程]