某柴油污染场地NAPL运移规律研究  

Study on NAPL Migration in a Diesel Contaminated Site

作　　者：张惠灵[1,2] 陈浩 杨国栋 冯涛 李明[1] 尹书郭 ZHANG Huiling;CHEN Hao;YANG Guodong;FENG Tao;LI Ming;YIN Shuguo(College of Resource and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《环境科学与技术》2020年第5期171-180,共10页Environmental Science & Technology

基　　金：湖北省自然科学基金(2019CFB451);武汉科技大学科研启动经费(620161)。

摘　　要：该文根据某柴油污染场地调查和污染物检测结果,利用GMS中MODFLOW和SEAM3D模块建立研究区地下水流模型和典型非水相液体(NAPL)苯、甲苯及乙苯的运移模型研究了NAPL的运移规律,模型中考虑了对流-弥散、溶解、吸附和微生物降解等过程。研究结果显示,NAPL污染羽在100 d内运移较快,呈中心向四周均匀扩散趋势,随后逐渐沿地下水流向扩散,甲苯的污染羽面积大于苯和乙苯。敏感性分析表明,组分质量分数、溶解速率和Fe(Ⅲ)初始浓度是影响NAPL运移的关键因素。组分质量分数越大,其在地下水中的平衡浓度越高;溶解速率主要影响NAPL到达平衡的时间,溶解速率越大,到达平衡的时间越短;Fe(Ⅲ)初始浓度主要影响甲苯的微生物降解过程,Fe(Ⅲ)初始浓度越高,微生物降解作用越强,但对于苯和乙苯,微生物降解几乎不受Fe(Ⅲ)初始浓度的影响。该研究可为场地污染范围的确定、风险管控和修复提供科学依据。Based on field investigation and pollution detection results in a diesel contaminated site, the groundwater flow and typical non-aqueous phase liquid(NAPL) benzene, toluene and ethylbenzene migration model of the study area were established, which considered the convection-diffusion, dissolution, adsorption and microbial degradation process, and used MODFLOW and SEAM3 D module of GMS to study the migration of NAPL. The results showed that NAPL plume migrate rapidly from the center to the surrounding in 100 days, and then gradually spread along the flow direction of groundwater. The pollution area of toluene is larger than that of benzene and ethylbenzene. The mass fraction of component, dissolution rate and initial concentration of Fe(Ⅲ) are the key factors affecting the migration of NAPL by sensitivity analysis. The higher the mass fraction of NAPL components, the higher the equilibrium concentration in groundwater. The dissolution rate mainly affects the time when NAPL reaches equilibrium. The larger the dissolution rate, the shorter the time to reach equilibrium. The initial concentration of Fe(Ⅲ) mainly affects the biodegradation of toluene. The higher the initial concentration of Fe(Ⅲ), the stronger the biodegradation. However, the biodegradation of benzene and ethylbenzene is almost independent on the initial concentration of Fe(Ⅲ). This study can provide scientific basis for the determination of polluted scope, risk control and remediation of the contaminated sites.

关 键 词：非水相液体(NAPL) 运移 污染场地 微生物降解 数值模拟 

分 类 号：X523[环境科学与工程—环境工程]