| 摘要 |
PROBLEM TO BE SOLVED: To surely remove a weak electrolyte substance such as silica at a high removing rate in an electric deionization device. SOLUTION: The electric deionization device in which concentration chambers and desalting chambers are alternately formed by alternately arranging a plurality of anion exchange membranes and cation exchange membranes between an anode and a cathode and ion exchange bodies are filled in the desalting chambers is operated under following conditions: A/(Q.SV)>=4,000, wherein, A is an operation current (A); Q is the flow rate of water to be supplied to the desalting chamber per a desalting chamber (L/sec); and SV is the flow rate of water to be supplied per the volume of the ion exchange bodies in the desalting chamber (L/L-ion exchange bodies.sec).
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