Interactions between Three Tropical Soils and Municipal Solid Waste Landfill Leachate

Abstract

Three tropical soils from Ghana, West Africa, were investigated in the laboratory for their potential as liners for waste containment. The key characteristic evaluated was the impact of municipal solid waste landfill leachate on the geotechnical, mineralogical, sorptive and diffusive properties and hydraulic conductivity of the soils. The observed unique characteristics of the soils included their silica: sesquioxide ratios that allowed them to be classified as either lateritic (ratio of 1.33–2.0) or nonlateritic (ratio greater than 2.0). After 5–11 pore volumes of leachate permeation through the soils, the specific surface of each soil decreased due to mineralogical transformations, while the cation exchange capacity of the soils increased.