Numerical simulation of SVE in groundwater table fluctuation zone based on TMVOC
WANG Ying1,2, WANG Yang1, TANG Jun1, LI Juan1, YANG Yang1, BAI Shun-guo2, SHI Jun-xiang1,3
1. 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;
2. Institute of Urban and Rural Construction, Hebei Agricultural University, Baoding 071001, China;
3. Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, School of Environmental and Chemical Engineering, Nanchang University, Nanchang 330031, China
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 9.1×104Pa 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.
王颖, 汪洋, 唐军, 李娟, 杨洋, 白顺果, 史俊祥. 基于TMVOC的水位波动带土壤气相抽提模拟[J]. 中国环境科学, 2020, 40(1): 350-356.
WANG Ying, WANG Yang, TANG Jun, LI Juan, YANG Yang, BAI Shun-guo, SHI Jun-xiang. Numerical simulation of SVE in groundwater table fluctuation zone based on TMVOC. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(1): 350-356.
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