Analysis of Factors for Compacted Clay Liner Performance Considering Isothermal Adsorption

Zeng, Xing; Wang, Hengyu; Yao, J.

doi:10.3390/app11209735

Cited by 2 publications

(1 citation statement)

References 30 publications

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“…The pollutant solution was collected at different times after the machine stopped so that a breakthrough curve was obtained. Zeng et al [17] carried out centrifuge modeling of lead(II) transport in compacted clay liner. In the test, three different adsorption isotherms were considered to analyze the performance of clay liner.…”

Section: Introductionmentioning

confidence: 99%

Centrifuge Modeling of Chloride Ions Completely Breakthrough Kaolin Clay Liner

et al. 2022

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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 Δhw of 40 m was 1.6 years. As for strongly adsorptive pollutants, the breakthrough time t0.1 increased by 9 times when Rd increased from 1 to 10, which indicates that the effect of Rd on the performance of the liner was significant.

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Section: Introductionmentioning

confidence: 99%

Centrifuge Modeling of Chloride Ions Completely Breakthrough Kaolin Clay Liner

et al. 2022

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Analytical Solution of the One-Dimensional Transport of Ionic Contaminants in Porous Media with Time-Varying Velocity

Zeng

Gao

Xie

et al. 2023

Water

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The one-dimensional convection–dispersion equation has been widely used to describe the migration process of contaminant leachate through barriers. However, most of the existing solutions are limited to simple conditions. In this study, a one-dimensional convection–dispersion model with time-dependent velocity was established while considering the change in the permeability coefficient. The analytical solution of the model was obtained by using the integral transformation method. Based on the analytical model, three special conditions were assumed for comparison. The results showed that the concentration levels of pollutants inside the barrier would significantly increase with the increase in the flow velocity, and the pollutant concentrations inside the barrier would be increased by four times compared with the normal flow velocity when the flow rate increased by two times. The transports of heavy metal ions with variable velocities through soil–bentonite and soil–attapulgite barriers were predicted under field conditions. The predicted results showed that the breakthrough time would be reduced by as much as two times. In engineering practice, a barrier’s service performance can be improved by controlling the temperature of the seepage field and improving the chemical compatibility of the barrier materials.

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Analysis of Factors for Compacted Clay Liner Performance Considering Isothermal Adsorption

Cited by 2 publications

References 30 publications

Centrifuge Modeling of Chloride Ions Completely Breakthrough Kaolin Clay Liner

Centrifuge Modeling of Chloride Ions Completely Breakthrough Kaolin Clay Liner

Analytical Solution of the One-Dimensional Transport of Ionic Contaminants in Porous Media with Time-Varying Velocity

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