Abstract
A model was proposed for the prediction of multiple ion species in aggregated porous media under steady water flow conditions. The model is based on the two-region or mobile-immobile concept coupled with ion interactions based on thermodynamic equilibrium. This resulted in a set of convective-dispersive equations equivalent to the number of ions considered which were simultaneously solved using numerical methods. In another part of the study the two-region model was utilized for the purpose of predicting chloride-36 and tritium transport in a soil column of Abist soil under high but constant water flow velocity. Breakthrough curves (BTC) were obtained for two aggregate sizes (1–2 mm and 4–5 mm). Predicted BTC's using the two-region model provided unrealistically high retardation factors ( R) for both chloride-36 and tritium. In contrast R-values close to unity were obtained using the one-region model. Solute exchange between intra- and inter-aggregate pores appeared to be near equilibrium conditions even though high water flow velocities were used.
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