Abstract: The disclosed apparatus is a combined reverse osmosis electrodialysis assembly having osmotic membranes of anionic-cationic bilaminate ion-exchange composition and having electrodes supplying electrical current which effects water-splitting at the membrane faces to produce acidity in osmotic feed stream to prevent salt precipitation. Periodic current reversal inhibits membrane pore plugging and fouling. Heat sealing of membranes and spiral wound array are useful design variants.

Abstract: The permeable membrane assemblies disclosed in this application utilize the bi-leaf edge membrane concept and the lay-flat tubing connector concept presented in prior and pending patents for ionic systems. Herein these concepts are shown and claimed for their utility in transfer systems in general including selective transfer of gaseous fluids and liquid fluids whether ionic or not as well as for transfer of heat. As before the concepts offer advantages of simplicity and reliability and offer economical assembly in leak free equipment. Countercurrent flow of the fluids is obtained. Hydrogen separation from mixed gases is one application. The full range of dialysis and fluid to fluid extraction processes are prospective candidates for these design concepts.