Understanding Solute Transport in a Solid Waste Fill Using Basic Principles of Soil Mechanics and Stochastic Modelling

The solute transport owing to contaminant constituents in an emplaced solid waste was studied in saturated and oversaturated conditions using Sodium Chloride as the tracer. The flow was analysed using physical and probabilistic models commonly used in soil investigations. The Breakthrough Curves (BTCs) indicate relatively fast solute particles flowing vertically within the mass water flow in the waste fill. Unlike in previous studies, the transport of solutes from the inlet to the outlet has been undertaken using a transfer model, which is a function of volumetric water input. Although the simulated average fractional volume of water involved in the transport of solute particles appears to be slightly overestimated, the study indicates that virtually the entire water content of the saturated waste fill appears to be actively involved in solute transport within the waste mass. The disparity in the modelled and practicable values of the fractional flux in the saturated waste fill indicates that some of the solute particles are irreversibly adsorbed within the waste mass. The study further indicates solute flow along the cell wall in the oversaturated condition, and in general, shows the applicability of soil models to waste flows.

並列關鍵字

Inflow ； leachate ； saturation ； solute transport ； tracer test ； transfer function

國際替代計量

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