| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric regeneration type desalting device in which color change of an ion exchange membrane is prevented by imparting a function as a desalting room to electrode rooms and avoiding excessive concentration of ions, generation quantities of hydrogen and oxygen are suppressed, and also a recovery ratio of ultrapure water nearly equal to a conventional electric regeneration type desalting device is attained. SOLUTION: In this electric regeneration type desalting device in which the desalting rooms 5 and concentration rooms 6 are arranged between an anode room 2 and a cathode room 7, and ion exchange bodies are filled into each of the rooms, and a cation exchange membrane or an anion exchange membrane is alternately arranged between at least a portion of each of the rooms, the anode room 2 and the cathode room 7 have desalting constitution to remove ions, and concentrated water is introduced into the concentration rooms 6, the anode room 2 and the cathode room 7, and also a portion of mixed water of outlet water from the concentration room discharged from the concentration rooms 6 and outlet water from the electrode rooms discharged from the anode room 2 and the cathode room 7, is discharged and the balance is mixed with desalted raw water introduced as dilute water, and is introduced to the concentration room 6, the anode room 2 and the cathode room 7 as concentrated water. |
