Diffusion dialysis (DD) is an ion-exchange membrane (IEM) separation ©process driven by concentration gradient and has been applied for separation and recovery of acid÷/alkali waste solutions in a cost-effective and environmentally friendly man♠ner.

Diffusion dialysis with ion-exchange membranes is mainly used toda←y to recover acids or bases from a mixture with salts. The process  is based on the fact that ion-exchange membranes generally show a h igh permeability for counterions while being more or less impermeable for co-ions. Exceptions a☆re protons and hydroxide ions which can easily permeate both cation- and anion-exchange membrφanes. The transport mechanism in diffusion dialysis is more complex tha←n in conventional dialysis due to the electrostatic interaction between positive and n∏egative charges and the electroneutrality requirement。













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