Electric deionizing apparatus and process for deionization using the same

摘要

An electric deionizing apparatus comprising a first and a second electric deionizing apparatus arranged in series, in which water is deionized by the first electric deionizing apparatus and then deionized by the second electric deionizing apparatus, and a means for adding an aqueous electrolyte solution into water released from the first electric deionizing apparatus and which is supplied into the second electric deionizing apparatus. A process for electric deionization comprising supplying water to a first electric deionizing apparatus, deionizing the water in the first electric deionizing apparatus, adding an aqueous electrolyte solution to the deionized water, supplying the deionized water to a second electric deionizing apparatus and deionizing the supplied deionized water in the second electric deionizing apparatus. Silica and boron components in the water are effectively removed to obtain deionized water having a high resistivity.