Modelling of CaBr2 Ions Transport Through Ceramic Nanofiltration Membrane

Abstract

Nernst-Planck equation was used to try to understand the separating behaviour of Ca²⁺, and Br^- ions using nanofiltration membrane. The model was run for different membrane pores, different volumetric flux based on the membrane area values, and different ions concentration; to study the rejection behavior. In general, as the membrane pore radius increased, the rejection of Ca²⁺ and Br^- ions decreased; where the rejection of Ca²⁺ ion was the higher than the rejection of Br^- ion. While the rejections of Ca²⁺ and Br^- ions increased as volumetric flux based on the membrane area increased. On the other hand, the concentration of Br^- inside the membrane active layer was the higher than the concentration of Ca²⁺ ions. Thus the ions rejection is effected by the membrane pore radius beside the volumetric flux based on the membrane area