| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrical deionizer (EDI) capable of obtaining high quality water at high removal rate of impurities and without being affected by variation in quality of raw water, and a deionized water producing method. SOLUTION: In a desalting section of the EDI, a first small desalting section and a second small desalting section which are divided in the direction of the thickness of the desalting section by an intermediate ion exchange membrane 26 arranged between a cation exchange membrane 30 and an anion exchange membrane 22 are formed, and desalting divisions divided in parallel to the direction of desalting section thickness are formed in each of the first small desalting section and the second small desalting section. In the deionized water producing method, the EDI is used and water to be treated is caused to pass through a plurality of the desalting divisions. COPYRIGHT: (C)2009,JPO&INPIT
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