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The features of electroconvection in a smooth rectangular desalting channel of an electrodialysis apparatus with heterogeneous ion-exchange membranes have been theoretically investigated. A 2D model of electroconvection for a binary electrolyte has been constructed for overlimiting current regimes in the form of the Nernst–Planck–Poisson and Navier–Stokes equations. The influence of surface morphology of the heterogeneous ion-exchange membranes on vortex structures and on mass transfer of salt ions has been studied. The current–voltage characteristic has been calculated for the heterogeneous ion-exchange membranes. It has been shown that mass transfer in the membrane channel can be enhanced by improving the surface morphology of the heterogeneous ion-exchange membranes. The strong-base homogeneous membrane AMX and the modified heterogeneous membrane AMH-M have been studied using the rotating membrane disk technique.
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Zabolotsky et al. (2017) studied this question.
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