Migration of organic contaminants in composite geomembrane cut-off wall considering groundwater seepage

PENG Chun-hui; FENG Shi-jin; CHEN Hong-xin; LUO Chun-yong; LIANG Ai-min; DING Xiang-hong

doi:10.11779/CJGE202111012

Volume 43 Issue 11

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Chinese Journal of Geotechnical Engineering > 2021 > 43(11): 2055-2063. > DOI: 10.11779/CJGE202111012

PENG Chun-hui, FENG Shi-jin, CHEN Hong-xin, LUO Chun-yong, LIANG Ai-min, DING Xiang-hong. Migration of organic contaminants in composite geomembrane cut-off wall considering groundwater seepage[J]. Chinese Journal of Geotechnical Engineering, 2021, 43(11): 2055-2063. DOI: 10.11779/CJGE202111012

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Migration of organic contaminants in composite geomembrane cut-off wall considering groundwater seepage

1.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering, Ministry of Education, Shanghai 200092, China
3.
School of Architecture and Civil Engineering, Jinggangshan University, Ji'an 343100, China

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Received Date: April 05, 2021
Available Online: December 01, 2022

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Abstract

Abstract

The composite geomembrane cut-off wall (CGCW) is one of the most effective technologies to prevent the horizontal migration of contaminants at present. Considering the characteristics of groundwater seepage in the outside aquifer, a numerical model for migration of the organic contaminants into the CGCW-aquifer system is established, and is solved using the finite element software COMSOL 5.3. The influences of parameters of the aquifer and CGCW are comprehensively investigated. The increase of the groundwater flow rate in the outside aquifer will accelerate the migration of contaminants and decrease the concentration of contaminants in the CGCW. In addition, when the seepage velocity is higher than 1×10^-5 m/s and lower than 1×10^-9 m/s, the models based on the boundary conditions of zero concentration and non-advection aquifer can be applied to the preliminary design of CGCW. Furthermore, the optimal location of the geomembrane in the CGCW is closely related to the type of contaminants and groundwater flow rate of the outsider aquifer, and the difference among the cumulative mass fluxes of the outlet face in the CGCW at different geomembrane locations can reach 10%~20%. The performance of the CGCW with EVOH geomembrane is significantly better than that of the CGCW with HDPE geomembrane.
- cut-off wall,
- geomembrane,
- aquifer,
- pollution site,
- organic contaminant

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