| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for cleaning an electric deionizer, which can satisfactorily lower a water passing pressure difference. SOLUTION: A plurality of anion exchange membranes 3 and cation exchange membranes 4 are alternately arranged between an anode 1 and a cathode 2 to alternately form enrichment chambers 5 and desalination chambers 6. The desalination chambers 6 are packed with an ion exchange resin 10. When the water passing pressure difference in the desalination chamber 6 has risen, the application of voltage to the electrodes is stopped, and reverse washing water directed from the flowout port to the inflow port is allowed to flow. The reverse washing water is pure water, ultrapure water, or clean water having a lower ion concentration than the desalination chamber treated water. COPYRIGHT: (C)2008,JPO&INPIT
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