Modeling of solute transporting a chemically homogeneous porous media

Abstract

This paper aims to validate this theory by modeling the unidirectional transport represented by a one-dimensional model of a solute in a fixed bed laboratory column and if local thermodynamic equilibrium and linear adsorption So we conducted a theoretical parametric study to investigate influence the overall capacity and flow  rate of the reactive dispersion. The validation was done theoretically by solving analytically and numerically the transport Fickian advection dispersion equation  of inert tracer (water) and solute interactive.

The modeling step has allowed us to develop a model for the simulation of reactive transport in chemically homogeneous. The modeling was based on the numerical solution of the transport equation by the finite volume method using a systemic approach. The computer code was developed in FORTRAN.

The exploitation of these results was based on the concept of the distribution of residence times and retention time. The numerical results are in good agreement with the analytical results, which confirmed the validity of the developed numerical model. The superposition of the breakthrough curves of the two tracers based on reduced time confirmed the validity of the theory of transport and showed equal reduced both tracers for the same flow variances. The parametric study showed that the dispersion increases with the flow because of the existence of a stationary phase solute exchange with the mobile phase. At a constant speed, which tested the hypothesis of local thermodynamic equilibrium, breakthrough curves at different global capacity are superimposed and are symmetrical, which explains, there are no areas of stagnant fluid exchange of solute with the mobile phase and the dispersion is only due to hydrodynamic dispersion.