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Centrifuge Modeling of Chloride Ions Completely Breakthrough Kaolin Clay Liner

Author

Listed:
  • 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)

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.

Suggested Citation

  • Xing Zeng & Jia Su & Hengyu Wang & Tong Gao, 2022. "Centrifuge Modeling of Chloride Ions Completely Breakthrough Kaolin Clay Liner," Sustainability, MDPI, vol. 14(12), pages 1-13, June.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:12:p:6976-:d:833290
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