| 摘要 |
An electrodeionization apparatus and a method for operating the apparatus are provided. With this, concentration diffusion of boron from a concentrating chamber can be suppressed to obtain product water having a very low boron concentration. Raw water in introduced into a desalting chamber 16 , and product water is discharged from the desalting chamber 16 . A part of the product water is introduced into a concentrating chamber 15 in a single pass in the direction opposite to the flow in the desalting chamber 16 . Water discharged from the concentrating chamber 15 is drained out of a system. An inlet of the concentrating chamber 15 is provided at a side of an outlet for discharging product water from the desalting chamber 16 , and an outlet of the concentrating chamber 15 is provided at a side of an inlet for introducing raw water into the desalting chamber 16 . Concentrated water discharged from the concentrating chamber has a boron concentration of 500 times or less than that of the product water or of 10 ppb or less.
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