An analytical model of bubble-facilitated vapor intrusion

Ma, Enze1,2,3; Zhang, You-Kuan1,2,3; Liang, Xiuyu1,2,3; Yang, Jinzhong4; Zhao, Yuqing1,2,3; Liu, Xinyue1,2,3

2019-11-15

10.1016/j.watres.2019.114992

WATER RESEARCH   影响因子和分区

0043-1354

Mass transfer from nonaqueous phase liquid (NAPL) to entrapped air induced by a fluctuating water table commonly occurs in residual NAPL zones in aquifers. Gas bubble expansion and vertical migration due to interphase mass transfer could facilitate the upward transport of volatile organic compounds (VOCs) in the aquifer and result in higher mass fluxes into a building relative to those of diffusion-limited (D-L) VOC transport. However, the current vapor intrusion models have not considered bubble migration. In this study, an analytical solution of bubble-facilitated (B-F) VOC transport in the unsaturated-saturated zone was developed. The analytical solution was tested by a numerical solution using the finite difference method. Sensitivity analyses of model parameters were implemented to understand the VOC transport behaviors. The effects of bubble migration on vapor intrusion pathway completion time (t(c)) and the attenuation factor (AF) were investigated by comparison with the D-L VOC transport model. The results indicate that the D-L model significantly overestimates the tc and underestimates the AF because the model neglects the impacts of bubble migration. Therefore, one may make an inappropriate decision and set up an inappropriate response action schedule if using the D-L model to assess the risk of bubble-facilitated vapor intrusion. The analytical solution was applied to a laboratory experiment. The analytical model managed to interpret the laboratory experiment data, showing that the mass flux of B-F VOC transport is two orders of magnitude higher than that of D-L VOC transport. (C) 2019 Elsevier Ltd. All rights reserved.

Vapor intrusion Bubble-facilitated transport Volatile organic chemical Analytical model

SCI ; EI

英语

NI期刊

第一 ; 通讯

Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control[2017B030301012]

Engineering ; Environmental Sciences & Ecology ; Water Resources

Engineering, Environmental ; Environmental Sciences ; Water Resources

WOS:000487565000025

PERGAMON-ELSEVIER SCIENCE LTD

20193407350600

Aquifers ; Chemical analysis ; Finite difference method ; Hydrogeology ; Mass transfer ; Numerical methods ; Organic chemicals ; Risk assessment ; Sensitivity analysis ; Volatile organic compounds

Groundwater:444.2 ; Geology:481.1 ; Mass Transfer:641.3 ; Organic Compounds:804.1 ; Accidents and Accident Prevention:914.1 ; Mathematics:921 ; Numerical Methods:921.6

ENVIRONMENT/ECOLOGY

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Guangdong Prov Key Lab Soil & Groundwater Pollut, Shenzhen 518055, Guangdong, Peoples R China
2.Southern Univ Sci & Technol, Sch Environm Sci & Engn, State Environm Protect Key Lab Integrated Surface, Shenzhen 518055, Guangdong, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen Municipal Engn Lab Environm IoT Technol, Shenzhen 518055, Guangdong, Peoples R China
4.Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China

Ma, Enze,Zhang, You-Kuan,Liang, Xiuyu,et al. An analytical model of bubble-facilitated vapor intrusion[J]. WATER RESEARCH,2019,165.

Ma, Enze,Zhang, You-Kuan,Liang, Xiuyu,Yang, Jinzhong,Zhao, Yuqing,&Liu, Xinyue.(2019).An analytical model of bubble-facilitated vapor intrusion.WATER RESEARCH,165.

Ma, Enze,et al."An analytical model of bubble-facilitated vapor intrusion".WATER RESEARCH 165(2019).