Development and validation of practical membrane efficiency models for landfill liner systems.

Area of Science:

• Geotechnical Engineering
• Environmental Science
• Clay Science

Background:

• Landfill contaminant transport threatens groundwater quality.
• Compacted clay liners and bentonite-based clays serve as essential landfill barriers.
• Membrane behavior, quantified by the membrane efficiency coefficient, is key to clay barrier performance.

Purpose of the Study:

• Develop practical membrane efficiency models for salt-contaminated clays.
• Enhance the design of landfill barriers.
• Provide reliable tools for predicting contaminant transport through clay liners.

Main Methods:

• Two modeling approaches were developed: a purely empirical model and a semi-analytical model.
• Models define membrane behavior as a function of void ratio and salt concentration.
• Literature-based experimental data were used to validate model reliability.

Main Results:

• Both empirical and semi-analytical models demonstrated good agreement with experimental data.
• The empirical model showed higher applicability in dilute solute concentrations.
• Material constants for various clay types were presented.

Conclusions:

• Practical models for membrane efficiency in salt-contaminated clays have been successfully developed.
• These models offer valuable tools for designing effective landfill barriers.
• The study contributes to understanding and predicting contaminant transport in clay liners.