Patent ID: 6461491
Filing Date: 2002-10-08
Classification: B01D

Abstract:
Apparatus for electrodialysis of aqueous fluids to transfer dissolved salts or impurities from a diluate solution into a concentrate solution comprising:an electrodialysis unit including a stack of semipermeable, ion selective membranes and including first and second electrodes for applying an electric field with respect to said stack of ion-selective membranes so as to cause ions to migrate from the diluate solution to the concentrate solution through said ion selective membranes, said electrodialysis unit defining at least one diluate solution compartment and at least one concentrate solution compartment, said diluate solution compartment and said concentrate solution compartment being separated by said ion-selective membranes; a first electrode compartment adjacent said first electrode and a second electrode compartment adjacent said second electrode; said first electrode being a cathode electrode and said second electrode being an anode electrode; and a first electrode rinse solution circulated through said first electrode compartment and a second electrode rinse solution circulated through said second electrode compartment; said first electrode rinse solution being an acidic cathode electrode solution to prevent predefined precipitates adjacent said first cathode electrode and said second electrode rinse solution being a basic anode electrode rinse solution to prevent chlorine gas liberation adjacent said second anode electrode.