Influence of nonlinear sorption on groundwater transport of hydrophobic organic compounds
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Several popular sorption models, including the single-solute Linear, Freundlich, Langmuir, Langmuir-partition, Polanyi-partition model, and the two-solute competitive sorption model, were incorporated into a one-dimension transport model to investigate the influence of the form of sorption isotherm on the transport model predictions. Three types of numerical experiments were conducted, including: transport experiments, remediation experiments and simulation of Borden experiment. The results showed a significant influence of the form of the sorption isotherm on the groundwater contaminant transport predictions. In transport and remediation simulations, the time-to-breakthrough and time-to remediation for the three single-solute isotherms differed from each other. For the two-solute competitive sorption models, both solutes exhibited an enhanced transport or remediation, especially the less sorbing solute. In Borden experiment simulations, the total mass in domain, the velocity of the center of the plume, and the spreading of the plume were also highly dependent on the sorption isotherms.