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

Reducing marine pollution from single-use plastics (SUPs): A review

Geosynthetic clay liners

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

Angles of friction and dilatancy of sand

Diffusion of sodium and chloride through geosynthetic clay liners

Adsorption, sedimentation, and inactivation of E. coli within wastewater treatment wetlands.

A geomembrane  compacted clay composite liner system used to contain municipal solid waste (MSW) landfill leachate for 14 years is evaluated. Field observations of the geomembrane revealed many de...

Evaluation of an HDPE geomembrane after 14 years as a leachate lagoon liner

Swelling characteristics of needlepunched, thermally treated geosynthetic clay liners

Test apparatus designed to examine volatile organic compound (VOC) diffusion through geosynthetic clay liners (GCLs) are described, together with procedures for evaluating the relevant diffusion and sorption parameters. Test results show that the rate of contaminant migration proceeded through the hydrated GCL in the decreasing order of DCM and DCA > benzene > TCE and toluene. This was attributed to varying degrees of sorption of DCA, benzene, TCE and toluene to the geotextile component of the GCL as well as to the bentonite present in the GCL. Diffusion coefficients deduced from VOC diffusion testing conducted on the GCLs at confining pressures lower than approximately 10 kPa range from 2 × 10–10 m2/s to 3 × 10–10 m2/s. This is generally lower than those reported in the literature for compacted clay liner materials. Assessments of the environmental protection afforded by a landfill liner require that all underlying soil and geosynthetics components be considered in landfill contaminant migration assessme...

Craig B. Lake

Papers

Diffusion of sodium and chloride through geosynthetic clay liners

Adsorption, sedimentation, and inactivation of E. coli within wastewater treatment wetlands.

Evaluation of an HDPE geomembrane after 14 years as a leachate lagoon liner

Swelling characteristics of needlepunched, thermally treated geosynthetic clay liners

Volatile organic compound diffusion and sorption coefficients for a needle-punched GCL