This lecture describes the latest findings with respect to the long-term performance of modern municipal solid waste (MSW) landfill barrier systems. Field data relating to the clogging of leachate collection systems and the latest techniques for predicting their performance are examined. It is indicated that the primary leachate collection systems may have service lives that range from less than a decade to more than a century, depending on the design details, waste characteristics and mode of operation. Recent data indicate that landfill liner temperatures can be expected to reach at least 30–40°C for normal landfill operations. With recirculation of leachate the liner temperature increases faster than under normal operating conditions, and may be expected to exceed 40°C. Temperatures (up to 40–60°C) may occur at the base of landfills where there is a significant leachate mound. Temperature is shown to have a significant impact on both contaminant migration and the service life of the liner system. Field...

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Long-term performance of contaminant barrier systems

Tailings are ground rock particles from which the valuable minerals or metals have been extracted. An historical overview on hard rock mines shows that since the 1930s, it has become current practi...

Colloquium 2004: Hydrogeotechnical properties of hard rock tailings from metal mines and emerging geoenvironmental disposal approaches

The rheological behavior of some sensitive clays has shown that there are positive relationships between plastic viscosity, yield stress, remolded shear strength, and liquidity index. Based on the ...

Viscosity, yield stress, remolded strength, and liquidity index relationships for sensitive clays

Long-term barrier performance of modified bentonite materials against sodium and calcium permeant solutions

Effect of acid rain pH on leaching behavior of cement stabilized lead-contaminated soil.

1. Basic Concepts. 2. Leachate Characteristics and Collection. 3. Clay Liners: Compaction, Hydraulic Conductivity and Clay Mineralogy. 4. Clay/Leachate Compatibility by Measurement of Hydraulic Conductivity. 5. Flow Modelling. 6. Chemical Transfer by Diffusion. 7. Contaminant Transport Modelling. 8. Evaluation of Diffusion and Distribution Coefficients. 9. Field Studies of Diffusion and Hydraulic Conductivity. 10. Contaminant Migration in Intact Porous Media: Analysis and Design Considerations. 11. Migration in Fractured Media: Analysis and Design Considerations. 12. Geosynthetic Clay Liners (GCLs). 13. Geomembrane Liners. 14. Covers. 15. Geotechnical and Related Design Issues. 16. Integration of Hydrogeology and Engineering in Barrier Design and Impact Assessment. Index.

Barrier Systems for Waste Disposal Facilities

A review of the recent research literature concerning the geology, mineralogy, and physicochemistry of soft soils in Canada is presented. Soft clays are considered from three viewpoints: (1) their ...

Geology, mineralogy, and geochemistry of Canadian soft soils: a geotechnical perspective

The current use of engineered clayey barriers to control the chemical flux entering the groundwater adjacent to landfill sites is discussed. New analytical methods to predict flux–time relationship...

Clayey barrier assessment for impoundment of domestic waste leachate (southern Ontario) including clay–leachate compatibility by hydraulic conductivity testing

Robert M. Quigley

Papers

Barrier Systems for Waste Disposal Facilities

Geology, mineralogy, and geochemistry of Canadian soft soils: a geotechnical perspective

Clayey barrier assessment for impoundment of domestic waste leachate (southern Ontario) including clay–leachate compatibility by hydraulic conductivity testing

Research Notes: Soil Mineralogy, Winnipeg Swelling Clays

Contaminant transport modelling