One-dimension model for transport of organic contaminants in double-artificial composite liner under thermal osmosis

ZHANG Chunhua; HUANG Jiangdong; DENG Zhengding; XIE Haijian; DENG Tongfa

doi:10.11779/CJGE20230280

Volume 46 Issue 6

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Chinese Journal of Geotechnical Engineering > 2024 > 46(6): 1254-1262. > DOI: 10.11779/CJGE20230280

ZHANG Chunhua, HUANG Jiangdong, DENG Zhengding, XIE Haijian, DENG Tongfa. One-dimension model for transport of organic contaminants in double-artificial composite liner under thermal osmosis[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(6): 1254-1262. DOI: 10.11779/CJGE20230280

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One-dimension model for transport of organic contaminants in double-artificial composite liner under thermal osmosis

1.
Jiangxi Province Key Laboratory of Environmental Geotechnical Engineering and Hazards Control, Jiangxi University of Science and Technology, Ganzhou 341000, China
2.
School of Civil and Surveying & Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
3.
Center for Balance Architecture, Zhejiang University, Hangzhou 310058, China

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Received Date: April 02, 2023
Available Online: June 04, 2024

Graphical Abstract

Abstract

Abstract

A one-dimensional model for transport of organic contaminants in a double-artificial composite liner under thermal osmosis is proposed. The model is simulated by using the COMSOL Multiphysics. The results show that the bottom concentration only increases by 4.9% even when the leachate head increases to 10 m. It means that the effects of leachate head on transport of organic contaminants in the double-artificial composite liner are negligible. The bottom concentration of the double-artificial composite liner system will increase by 31.5% when the coefficient of thermal osmosis increases to 5×10^-11 m²·K^-1·s^-1. The effects of thermal osmosis should be considered in the double-artificial composite liner design when the coefficient of thermal osmosis reaches 1×10^-11 m²·K^-1·s^-1. The length of wrinkle and the frequency of holes on the secondary liner geomembrane have significant effects on contaminant transport in the double-artificial composite liner. The bottom concentration increases by 87% when the length of wrinkle increases from10 to 100 m. In the construction of the double-artificial composite liner, the construction quality of the secondary liner geomembrane should be strictly controlled to reduce the generation of wrinkles and holes, which can effectively improve the service performance of the liner system.
- thermal osmosis,
- double-artificial composite liner,
- organic contaminant,
- wrinkle

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References

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