Patent ID: 7247225

Claim:
An electrodeionization apparatus comprising: a cathode; an anode; a first cation exchange membrane, an anion exchange membrane, and a second cation exchange membrane arranged between the cathode and the anode; a concentration-cathode compartment formed between the cathode and the first cation exchange membrane; a desalting compartment formed between the first cation exchange membrane and the anion exchange membrane; a concentrating compartment formed between the anion exchange membrane and the second cation exchange membrane; an anode compartment formed between the second cation exchange membrane and the anode; conductive materials filled in the concentrating compartment, the anode compartment, and the concentration/cathode compartment, respectively; and an ion exchanger filled in the desalting compartment, wherein a partition member is fitted in the desalting compartment so that a large number of cells are defined by the partition member, the first cation exchange membrane and the anion exchange membrane in the desalting compartment; the ion exchanger is filled in the respective cells; at least parts of the partition member facing the cell are inclined relative to a general flow direction of water in the desalting compartment; and at least the inclined parts of the partition member allow penetration of water but prevent penetration of the ion exchanger.