Abstract
This note presents some results of a theoretical and experimental study of the rates of simultaneous migration and dispersion of an aqueous organic contaminant and an aqueous inorganic contaminant. For one-dimensional vertical contaminant transport, accompanied by linear sorption in a uniform soil under a constant hydraulic gradient, the variation of concentration c with time t and depth z is governed by the advection-dispersion equation, which is a second-order linear partial differential equation. Tests were conducted using a Mark II Minidrum Centrifuge with a twin concentric shaft. The one-dimensional leaching of two contaminants simultaneously through an E-grade kaolin layer was successfully modelled. Post-test sampling showed a clear separation between the inorganic contaminant (sodium chloride) and organic contaminant (food dye) plumes. The two tests showed that this type of centrifuge testing provides good prospects for the experimental study and measurement of contaminant transport processes in fine-grained soils. However, a discrepancy between theory and observation, needing further investigation, was found in one of the tests.
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