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Sepiolite as an Alternative Liner Material in Municipal Solid Waste Landfills

Summary: Sepiolite as an Alternative Liner Material in Municipal Solid
Waste Landfills
Yucel Guney1
; Savas Koparal2
; and Ahmet H. Aydilek3
Abstract: Compacted clay has traditionally been used as a lining material in municipal solid waste landfills. However, natural clays may
not always provide good contaminant sorption properties. One alternative material that is abundant in some parts of Europe and Turkey
as well as Western United States is sepiolite. A laboratory study was undertaken to investigate the feasibility of sepiolite as a liner
material. Two clays, one rich in sepiolite and the other one rich in kaolinite mineral, as well as their mixtures were subjected to
geomechanical, hydraulic, and environmental tests. The same soils were also subjected to strength and hydraulic conductivity tests after
a series of freeze and thaw cycles. The results of the study indicated that relatively high hydraulic conductivity and shrinkage capacity of
sepiolite necessitates addition of kaolinite before being used as a landfill material. The valence of the salt solutions affected the swell and
hydraulic conductivity characteristics of the clays tested. Retardation factors for sepiolite for metal solutions are 1.22.2 times higher than
those calculated for the clay that is rich in kaolinite, and the inorganic contaminant adsorption capacity of the clay can be improved by
addition of sepiolite. The results indicated that the clay mixtures utilized in this study provide good geomechanical, hydraulic, and metal
adsorption properties which may justify their potential use as a liner material in solid waste landfills.
DOI: 10.1061/ ASCE 1090-0241 2008 134:8 1166
CE Database subject headings: Municipal wastes; Solid wastes; Landfills; Adsorption; Inorganic chemicals; Waste management.
The primary duty expected from a liner material is to act as a low


Source: Aydilek, Ahmet - Department of Civil and Environmental Engineering, University of Maryland at College Park


Collections: Engineering