Principle of electrodialysis
Electrodialysis uses an electrical voltage field and semi-permeable membranes for the isolation of dissolved products from water.
Electrodialysis and reverse osmosis both use semi-permeable membranes and have similar applications. The separation principle, however, is different. In reverse osmosis, water is forced through the membrane. As a result, the salts and other dissolved products remain, and pure water is obtained from the other side of the membrane. In electrodialysis, salts are attracted by an imposed DC. These salts are then selectively led through membranes, leaving the water and uncharged solutes left. Also see
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