Centrifuge Modeling of Chloride Ions Completely Breakthrough Kaolin Clay Liner

Xing Zeng, Jia Su, Hengyu Wang and Tong Gao
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Xing Zeng: Hunan Province Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan 411201, China
Jia Su: Hunan Province Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan 411201, China
Hengyu Wang: School of Civil Engineering and Architecture, NingboTech University, Ningbo 315100, China
Tong Gao: Hunan Province Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring, Hunan University of Science and Technology, Xiangtan 411201, China

Sustainability, 2022, vol. 14, issue 12, 1-13

Abstract: The 2 m thick compacted clay liner with a permeability coefficient of 1 × 10 − 7 cm/s is required in the Chinese technical specifications about landfills. The processes of chloride ion completely breakthrough low permeability barriers ( k ≤ 1 × 10 − 7 cm/s) were modeled at 50 g in a geo-centrifuge. A measuring system was used to monitor solute velocity and conductivity. The entire process of chloride ion completely breaking through 2 m Kaolin clay liner was modeled successfully, which provided a valuable testing technology for centrifuge modeling of contaminant transport through low-permeable clay. The analyses results indicated the breakthrough time of conservative pollutant for the 2 m clay liner with a hydraulic conductivity of 1.0 × 10 −9 m/s under Δ h w of 40 m was 1.6 years. As for strongly adsorptive pollutants, the breakthrough time t 0.1 increased by 9 times when R d increased from 1 to 10, which indicates that the effect of R d on the performance of the liner was significant.

Keywords: centrifuge modeling; kaolin clay liner; chloride ion; breakthrough time (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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