| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrodeionization apparatus which suppresses concentration diffusion of boron from a concentrating chamber so that product water having an extremely low boron concentration can be obtained, and to provide an operating method therefor. SOLUTION: Raw water is introduced into a desalting chambers 16, and produced water is discharged from desalting chambers 16. Part of the produced water is passed to a concentrating chambers 15 in a direction reverse to the water passing direction in the desalting chambers 16 in a counter-current single pass system, and outflow water of the concentrating chambers 15 is discharged outside the system. The discharge side of the produced water in each desalting chamber 16 is provided with the inflow port of each concentrating chamber 15, and the inflow side of the raw water in each desalting chamber 16 is provided with the outflow port of each concentrating chamber 15. The concentration of boron in the concentrated water flowing out from each concentrating chamber is≤500 times that in the produced water, or is≤10 ppb. COPYRIGHT: (C)2004,JPO&NCIPI
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