Stationary solutions to the concentration wave front problem for nonequilibrium binary ion-exchange systems as obtained within the framework of surface complexation theory

Steady-state concentration wave fronts in binary ion-exchange systems were described by numerically and analytically solving dynamic equations of mate rial balance and external-diffusion kinetics equations in partial derivativ es. Binary (NB) ion-exchange equilibria were described in terms of surface complexation theory (SCT). Results of numerical calculations of binary fron tal distributions were compared to a set of analytical solutions for binary (NB) ion-exchange systems at various SCT equilibrium constants, column len gths, and HETP values. The calculation results suggest that SCT, a theory o f many-ion equilibria, adequately describes the dynamics of multicomponent systems.