Patent ID: 6733646
Filing Date: 2004-05-11
Classification: B01D,B01J,C02F,Y02A

Abstract:
A method of operating an electrodeionization apparatus which includes an anolyte compartment having an anode, a catholyte compartment having a cathode, at least one concentrating compartment containing at least one of ion-exchanger, activated carbon and electric conductor, and at least one desalting compartment containing ion-exchanger, the concentrating compartment and the desalting compartment being formed between the anolyte compartment and the catholyte compartment by arranging at least one anion-exchange membrane and at least one cation-exchange membrane,said method comprising: supplying electrode water into the anolyte compartment and the catholyte compartment; feeding raw water into the desalting compartment through an inlet thereof so that deionized water flows out from the desalting compartment through an outlet thereof; and supplying a part of the deionized water into the concentrating compartment from a side adjacent to the outlet of the desalting compartment and ejecting the part of the deionized water as concentrated water from the concentrating compartment from a side adjacent the inlet of the desalting compartment so that the part of the deionized water introduced in the concentrating compartment flows in a direction opposite to the raw water flowing through the desalting compartment, at least a part of the concentrated water flowing out of the concentrating compartment being discharged out of a circulatory system.