加油站地下水苯系物迁移模拟研究  

Transfer of Benzene Series in Groundwater Around a Gas Station:A Simulation Sudy

作　　者：王玉蕊[1] 陈启华[1] 唐丽丽[1] 孙静[1] 张维[1] WANG Yurui CHEN Qihua TANG Lili SUN Jing ZHANG Wei(Tianjin Academy of Environmental Sciences, Tianjin 300191, China)

机构地区：[1]天津市环境保护科学研究院,天津300191

出　　处：《天津科技》2017年第3期81-85,共5页Tianjin Science & Technology

摘　　要：以天津市某加油站为例,采用污染指数法进行地下水污染评价,并在水文地质调查的基础上,采用Visual MODFLOW模型进行地下水流场和溶质迁移模拟,预测苯系物在地下水中的迁移过程和污染趋势。结果表明:加油站监测井水质基本指标的现状污染级别为Ⅵ级极重污染,基本指标污染的主要贡献指标为挥发酚、高锰酸盐指数色度、浊度和铁,其次为总氟;特征指标的现状污染级别为轻污染,最明显的污染贡献者为苯系物。采用Visual MODFLOW模型进行地下水流场及溶质运移模拟,结果显示:通过多次模型的校验,所建立的模型基本达到精度要求,符合评估区水文地质条件,能基本反映该区地下水系统的动态特征,可用于溶质运移模拟。污染物运移模拟结果显示,随着时间的推移,污染羽不断随着地下水向东南方向迁移;地下水流速缓慢,苯系物随地下水缓慢迁移,污染下游地下水。This case study was carried out at a gas station in Tianjin. On the basis of field investigation of hydrogeological conditions and groundwater quality, Visual MODFLOW was used to simulate subsurface flow field and solute transporta- tion, and predict the migration characters and pollution tendency of benzenes in groundwater. The results show that the water pollution level at the monitoring well is up to level-Ⅵ （very serious pollution）. Major contributory indexes for basic pollution indexes include volatile phenol, permanganate index chromaticity, turbidity and iron; minor index is total fluorin. The current pollution level of characteristic indexes is light pollution and the most obvious contributor is benzene series. Visual MODFLOW model was used to simulate the groundwater field and solute transportation. The results indicate that, the established model, after numerous verifications, has basically satisfied the precision requirement and met the hydrogeological conditions of the assessed area. It is able to reflect the dynamic features of the groundwater system in the area and thus can be used for the modeling of solute transportation. The simulation result of contaminant transportation indi- cates that the pollution plume will transfer southeastward along with the groundwater over time; as the flow rate of ground- water is slow, the transfer of benzene series is slow and the downstream groundwater will be gradually contaminated.

关 键 词：加油站 地下水 苯系物 迁移模拟 

分 类 号：X824[环境科学与工程—环境工程]