A mathematical model that accounts for simultaneous moisture movement and contaminant transport is developed to predict the leaching behavior from fly ash landfills with different age refuses. The approach is based on dividing the refuse layer into separate regions for each age refuse and solving model equations for each region. With the exception of boron in leachate of coal fly ash, good agreement between model simulation and experimental data of laboratory column-leaching tests was obtained. However, the simulated boron concentration profile can be improved by the addition of a retardation factor in the model equation. The important parameters were evaluated in a sensitivity analysis to see their respective effects. Four parameters were identified to influence strongly the model performance: dissolution rate constant (kn), exponential constant (n), ultimate mass of leachable contaminant (M0), and maximum contaminant concentration (Cmax).
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Huang et al. (1998) studied this question.
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