Investigating the role of vadose zone breathing in vapor intrusion from contaminated groundwater

被引:14
作者
Man, Jun [1 ,2 ]
Wang, Genfu [3 ]
Chen, Qiang [4 ]
Yao, Yijun [1 ,2 ]
机构
[1] Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Zhejiang Univ, Coll Environm & Resource Sci, MOE Key Lab Environm Remediat & Ecosyst Hlth, Hangzhou 310058, Peoples R China
[4] Nanjing Inst Environm Sci, Minist Ecol & Environm, State Environm Protect Key Lab Soil Environm Mana, Nanjing 210042, Peoples R China
基金
中国国家自然科学基金;
关键词
Vapor intrusion; Contaminated groundwater; Fluctuated water table; Vadose zone; Numerical simulation; UNSATURATED ZONE; SOIL TEXTURE; FLUCTUATIONS; GAS;
D O I
10.1016/j.jhazmat.2021.126272
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The fluctuation of the groundwater table can cause upward and downward advection of soil gas within the vadose zone, just like breathing. In this study, we developed a three-dimensional numerical model and used it to investigate the role of vadose zone breathing in vapor intrusion, through which subsurface volatile chemicals migrate into the concerned building at contaminated sites. The developed model was first applied to a sand tank experiment, followed by examining the influences of fluctuation amplitude and period of water table, soil textures, and groundwater level depth. Our results suggest that the indoor pollutant concentration can be increased by about three times with the oscillatory water table of 0.4 m amplitude and 4 d period. Within one cycle of vadose zone breathing, the indoor pollutant concentration is found to vary by about 7 orders of magnitude. The results also show that, compared to the groundwater level depth, the soil texture plays a significant role in determining vapor intrusion risks. Specifically, when soil particles increase from 0.25 mm to 0.44 mm, the indoor pollutant concentration tends to increase and becomes more sensitive to groundwater table fluctuation.
引用
收藏
页数:11
相关论文
共 40 条