Electrodialysis water treatment process ( ED – Process ) is one of the water treatment methods and Electro Dialysis Reversal (EDR) water treatment process employ specially prepared by the reverse osmosis water treatment membranes which are semipermeable to ions based on their charge, and they employ electrical current to reduce the ionic content of water.
Electrodialysis involves passing water between two plates with opposite electrical charges. The metals in the water are attracted to the plate with the negative charge while the non-metals are attracted to the plate with the positive charge. Both types of ions can be removed from the plates and discarded.
Electrodialysis water treatment is used with Water Quality on very hard water, with a hardness of more than 500 mg/L as calcium carbonate.
Recent developments have improved the efficiency of Electrodialysis by reversing the polarity of the electrodes periodically. This is called EDR and has reduced the scaling and fouling problems common to ED.