基于TMVOC的水位波动带土壤气相抽提模拟  

Numerical simulation of SVE in groundwater table fluctuation zone based on TMVOC

作　　者：王颖[1,2] 汪洋[1] 唐军 李娟[1] 杨洋[1] 白顺果[2] 史俊祥[1,3] WANG Ying;WANG Yang;TANG Jun;LI Juan;YANG Yang;BAI Shun-guo;SHI Jun-xiang(State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution,Institute of Water Environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Institute of Urban and Rural Construction,Hebei Agricultural University,Baoding 071001,China;Key Laboratory of Poyang Lake Environment and Resource Utilization,Ministry of Education,School of Environmental and Chemical Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]中国环境科学研究院水环境研究所,国家环境保护地下水污染模拟与控制重点实验室,北京100012 [2]河北农业大学城乡建设学院,河北保定071001 [3]南昌大学资源环境与化工学院,鄱阳湖环境与资源利用教育部重点实验室,江西南昌330031

出　　处：《中国环境科学》2020年第1期350-356,共7页China Environmental Science

基　　金：国家自然科学基金项目(41703114);国家水体污染控制与治理科技重大专项(2018ZX07109-001)

摘　　要：为探究水位波动对土壤气相抽提(Soil Vapor Extraction,SVE)修复的影响,以西北某傍河石化场地为研究对象,利用TMVOC模拟苯系物的自然衰减过程及不同水位状态下SVE修复过程,从修复效果、相间转化、饱和度演变等方面比较不同条件下苯系物的衰减率.结果显示,该场地较佳的抽提井的压强为9.1×104Pa,影响半径为8m;苯系物在自然衰减、水位稳定状态下SVE修复及水位波动状态下SVE修复12个月后的质量损失分别为17%、85%、96%;水位稳定和水位波动状态下SVE修复12个月后,非水相液体(Non-Aqueous Phase Liquids,NAPL)的饱和度最大可达到0.066和0.044;水位稳定状态下,苯系物在“气-液-NAPL”相去除率逐渐降低,水位波动状态下,在水位下降的阶段,更多的NAPL相苯系物转化为气相,并被抽提气流携带去除.The effects of groundwater table fluctuation(GTF)on the remediation of a petrochemically polluted riverside in northwestern China by soil vapor extraction(SVE)were investigated.The migration and transformation of benzene,toluene,ethylbenzene,and o-xylene(BTEX)in cases of natural attenuation and SVE with GTF were simulated using TMVOC model.The remediation rates of BTEX were analyzed by remediation effect,transformation among phases,and saturation variation under different conditions.The results showed that the optimized extraction well pressure and influencing radius of the target site were 9.1×10^4Pa and 8m,respectively.The removal rates of BTEX in cases of natural attenuation,SVE without GTF,and SVE with GTF were 17%,85%,and 96%,respectively.The NAPL saturation can reach as high as 0.066 and 0.044 in case of SVE without GTF,and SVE with GTF,respectively.In case of SVE without GTF,the remediation rate of BTEX in gas,aqueous,and NAPL phase decreased gradually.In case of SVE with GTF,more NAPL phase contaminant was transported to gas phase contaminant,and extracted by SVE during the stage of falling groundwater tables.

关 键 词：苯系物(BTEX) 地下水位波动 TMVOC模型 土壤气相抽提 

分 类 号：X53[环境科学与工程—环境工程]