To provide an operation method of an electric demineralizer, which prevents high concentration ions remaining in a concentration chamber from diffusing and flowing back into a treatment chamber and prevents the deterioration of treating water quality even when the electric demineralizer is stopped.
An electric demineralizer has the treatment chamber 13 and the concentration chamber 14, both partitioned by a cation exchange membrane 12 and a bipolar membrane 11 between a cathode and an anode. A cation exchange resin 16 is packed in the concentration chamber 14. An aqueous solution of sodium citrate is introduced from the inlet of the treatment chamber 13 and discharged from the outlet of the treatment chamber 13, and pure water is introduced from the inlet of the concentration chamber 14 and discharged from the outlet of the concentration chamber 14. After stopping treatment of a liquid to be treated by the electric demineralizer, pure water is made to flow through the concentration chamber 14 to carry out regeneration operation of the cation exchange resin 16.
COPYRIGHT: (C)2009,JPO&INPIT
Shinichi Omura
Takayuki Moribe
| JP2277526A |
Masataka Ota
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