Electrodialysis

<p>Electrodialysis (ED) is used to transport <a href="/facts/Salt/SCplalQ3">salt</a> <a href="/facts/Ions/wrbwhF3z">ions</a> from one <a href="/facts/Solution_(chemistry)/MGchhMQV">solution</a> through <a href="/facts/Ion-exchange_membrane/0JBv7LtI">ion-exchange membranes</a> to another solution under the influence of an applied <a href="/facts/Electric_potential/Nmqm6hm5">electric potential</a> difference. This is done in a configuration called an electrodialysis cell. The cell consists of a feed (dilute) compartment and a concentrate (<a href="/facts/Brine/xsN2GcLF">brine</a>) compartment formed by an <a href="/facts/Anion/wrbwhF3z">anion</a> exchange membrane and a <a href="/facts/Cation/wrbwhF3z">cation</a> exchange membrane placed between two <a href="/facts/Electrode/251PaKX8">electrodes</a>. In almost all practical electrodialysis processes, multiple electrodialysis cells are arranged into a configuration called an electrodialysis stack, with alternating anion and cation-exchange membranes forming the multiple electrodialysis cells. Electrodialysis processes are different from <a href="/facts/Distillation/plDvUMxn">distillation</a> techniques and other membrane based processes (such as <a href="/facts/Reverse_osmosis/U3EJPFHN">reverse osmosis</a> (RO)) in that dissolved species are moved away from the feed stream, whereas other processes move away the water from the remaining substances.  Because the quantity of dissolved species in the feed stream is far less than that of the fluid, electrodialysis offers the practical advantage of much higher feed recovery in many applications.
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Electrodialysis open-in-new

Electrodialysis