Effect of Ion Adsorption on Solute Transport in Saturated Porous Media

Document Type : Research Paper

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Abstract

Use of mathematical models as efficient tools in solute transport studies and management in porous
media is usual. The present model by making use of the governing equation for two - dimensional
solute transport in a porous medium expresses the ion adsorption effect on solute transport in a
saturated semi infinite porous medium.This model has been solved analyticaly under the first type
(Dirichlet condition) and the third type (Cauchy condition) boundary conditions. In solute transport
by diffusion, the third type boundary condition shows the solute concentration at the boundary or on
the soil surface more than that of the first boundary condition. In advection – dispersion solute
transport, the solute concentration distribution curves resulting from the first and third boundary
conditions because of advection predomination are approximately identical. The effect of ion
adsorption on the medium,s solid matrix is evaluated by retardation factor in the model. The
retardation factor greater than one causes retardation in solute transport, distribution and dispersion
in the medium. The effect of ion adsorption on solute concentration distribution is independent of
the selected boundary condition and depends on the modes of solute transport and dispersion in the
medium, so as the rate of this effect in advection – dispersion solute transport is more than in
diffusion transport.

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References

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