Reactive Solute Transport Analysis in Subsurface Environment

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One-dimensional reactive solute transport model has been developed by coupling of transport and chemical reactions in subsurface environments. The constrained interpolation profile (CIP) method was applied to the solute transport calculations. Numerical results by this model agreed well with the results from cation-exchange column experiments. The model was also applied to the numerical simulation of acid-flushing of a lead-contaminated soil. The solution procedure based on the proposed model in this study has advantage of the low-cost computation cost and simplicity to expand this model to different chemical reactions or other reactions-based transport systems. Furthermore, the numerical methods to solve the convection-dispersion equation by the CIP method and the method of characteristics (MOC) were examined and verified against the laboratory experiments. The laboratory study to test the performance of the numerical code was carried out for the saltwater movement in confined and unconfined aquifer cases. The results indicate that the CIP method is slightly less accurate in comparison with the MOC method. The CIP method, however, still give acceptable results in saltwater mixing zone in case of the seawater intrusion, and the calculation speed of CIP method is significantly shorter as compared to the MOC calculation. The model in this study can be useful in understanding the mechanism of multicomponent reactive solute transport in subsurface environments.