Mechanism of Electro Dialysis (ED) and its Applications

摘要

Electro Dialysis (ED) is used to transport salt ions from one solution to another solution through ion exchange membrane under the influence of an applied electric potential difference. This is done in a configuration is called as electro dialysis cell. This cell consists of a dilute and brine compartment formed by an anion exchange membrane and a cation exchange membrane placed between two electrodes. In all practical electro dialysis techniques, multiple electro dialysis cells are arranged into a configuration is known as Electro Dialysis Cell (EDC), with alternating anion and cation exchange membranes forming the multiple electro dialysis cells. Electro dialysis process is different from distillation techniques and other membrane based processes, such as Reverse Osmosis (RO) in which dissolved species are moved away from the feed stream rather than the reverse osmosis. As the amount of dissolved species in the feed stream is lower than that of the fluid, electro dialysis offers the practical advantage of higher feed recovery in many applications.