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Hydraulic and chemical evolution of GCLs during filter press and oedopermeametric tests performed with real leachate

Abstract : The solid waste decomposition inside a municipal solid waste (MSW) landfill may be enhanced by liquid addition in order to reach landfill stabilization in a reduced period of time as compared to dry-tomb landfills. This liquid addition provides an increased leachate volume and its specific chemical composition leads to fear a degradation of the hydraulic properties of the bottom liner system, especially the mineral part. In this study, the impact of four fluids on the chemical and hydraulic properties of three geosynthetic clay liners (GCLs) currently used in landfill bottom liner systems is evaluated using swelling tests, filter press tests and oedopermeameter tests. Each permeability test is associated to chemical analysis of the fluids before and after contact with the bentonites. The four fluids are two real leachates, a sewage slurry and a leachate from a green waste repository. The three GCLs contain either natural sodium bentonite or sodium-activated calcium bentonite. Filter press results and swell index tests reveal a larger impact on the permittivity of the bentonite of leachates as compared to the other fluids. Oedopermeameter tests lasted one year; they show a variable impact, either negative or positive, of the real leachate on the hydraulic conductivity of the GCLs. Specific conditions, such as pre-hydration, limit the impact of leachate on the hydraulic conductivity. Whatever the method used to determine the permittivity of bentonite or of the GCL, the natural sodium bentonite is less impacted by the fluids than the sodium-activated calcium bentonites.
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Contributor : Sandrine Rosin-Paumier <>
Submitted on : Monday, June 18, 2018 - 10:12:12 AM
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S. Rosin-Paumier, N. Touze-Foltz. Hydraulic and chemical evolution of GCLs during filter press and oedopermeametric tests performed with real leachate. Geotextiles and Geomembranes, Elsevier, 2012, 33, pp.15-24. ⟨10.1016/j.geotexmem.2012.02.002⟩. ⟨hal-01717764⟩



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