Finite element modeling of multi-phase contaminant transport in porous media
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Air sparging (AS) and soil vapor extraction (SVE) are remediation techniques that are particularly suitable for the removal of Volatile Organic Contaminants (VOC) from contaminated soil and ground water. However, the design and operation of these techniques are mainly subjective due to the lack of design tools suitable for field scale applications. The goal of this research is to develop and evaluate a numerical model of the mass transfer processes during advective air movement in soil to aid in the design and operation of AS/SVE systems. The model consists of two separate modules; steady state unsaturated air flow module, and transient multiphase contaminant transport module that incorporates non-equilibrium first order kinetics mass transfer. The solution in space was obtained using the Galerkin's finite elements formulation, while the solution in time was obtained using the central finite difference scheme.
