Simulation test study on inversion of BTEX pollution in groundwater based on soil gas rapid screening
VOCs represented by BTEX,are one of the common contaminants in industrial sites,which have a wide migration range and high environmental risk.In order to quickly identify the BTEX pollution in groundwater,improve the scientificity and accuracy of groundwater monitoring well placement,and reduce the investigation time and economic cost,this study built an ideal 3-dimensional model of BTEX pollution diffusion between groundwater and soil gas based on the BTEX phase distribution and steady-state diffusion model.A method of inversion of groundwater BTEX pollution through soil gas screening in the field was proposed,and a simulation test was carried out with a large sand box of 6.0 m×1.1 m×2.5 m.The results showed that the BTEX pollution in groundwater could be retrieved through stratified soil gas sampling and rapid detection.The inversion concentration of benzene,toluene,ethylbenzene and xylene in groundwater was 32.18～21 715.09 μg/L,16.10～13 173.69 μg/L,30.28～4 212.24 μg/L and 19.25～4 583.23 μg/L,respectively.Compared with the measured concentration 9.65～21 716.81 μg/L,14.95～13 171.93 μg/L,3.17～4 233.04 μg/L,21.39～4 498.93 μg/L,the R2 was 0.988 7～0.999 2.The research can provide a reference for the contaminated site investigation and control warning,but for the actual application of complex sites,further exploration is needed to further improve the model parameters and improve the inversion accuracy.
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