Abstract
Rainwater infiltration through soils at landfills and other waste sites containing adsorbed chemical contaminants results in the continuous release of leachates into the ground-water environment. Due to continuous desorption of contaminants, the soils are progressively cleansed, and the contaminant concentration of the leachate diminishes with time. This paper presents a simple approach to estimate leachate concentration, residual contaminant levels of soils, and quantities of contaminants released into the ground-water environment after specified years of infiltration. Two desorption processes are analyzed: one using a constant distribution coefficient, and the other following Langmuir's equilibrium adsorption isotherm. This approach can be used to assess preand postremediation impacts of leachates originating at a waste site on ground-water environment in the vicinity.
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