Abstract
In recent years, numerical analysis method for quantitatively predicting volatilization flux has been required for soil contamination countermeasures and exposure risk management. In particular, there are few models that take into account transport phenomena and phase changes such as advection, diffusion, and volatilization of volatile chemical substances (VCSs) from unsaturated contaminated soil. In this study, a soil column test was conducted on the constructed model to verify the validity of the calculation results. In the history-matching process, the coefficient of relative permeability, the rate constant, and the molecular dispersion coefficient on the ground surface and inside the soil became important parameters, and the consistency of these various values was confirmed. Since these values could be set to appropriate values even if the tortuosity and hydrodynamic dispersion coefficient were also reasoned, numerical model proved to have validity. A volatilization flux prediction method was precisely established through a parameter matching process used in a numerical analysis model that expresses mass transfer phenomena that take into account the environmental dynamics associated with the volatilization of VCSs.
