ELECTRIC DEIONIZATION APPARATUS AND METHOD OF OPERATING THE SAME

Title:

ELECTRIC DEIONIZATION APPARATUS AND METHOD OF OPERATING THE SAME

Document Type and Number:

WIPO Patent Application WO/2004/071968

Kind Code:

A1

Abstract:

An electric deionization apparatus capable of inhibiting the boron concentration diffusion from concentrating chamber to thereby enable obtaining a product water of extremely low boron concentration; and a method of operating the electric deionization apparatus. Raw water is introduced in desalting chamber (16), and product water is withdrawn from the desalting chamber (16). Portion of the product water is fed in a counterflow one-passage manner into concentrating chamber (15) in the direction opposite to the direction of water passage in the desalting chamber (16). Outflow water from the concentrating chamber (15) is discharged outside the system. Inflow port for the concentrating chamber (15) is disposed on the product water withdrawing side of the desalting chamber (16), and outflow port for the concentrating chamber (15) is disposed on the raw water inflow side of the desalting chamber (16). The boron concentration of concentrated water outflowing from the concentrating chamber is 10 ppb or less or up to 500 times that of the product water.

Inventors:

SATO SHIN (JP)

Application Number:

PCT/JP2004/001528

Publication Date:

August 26, 2004

Filing Date:

February 13, 2004

Export Citation:

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Assignee:

KURITA WATER IND LTD (JP)
SATO SHIN (JP)

International Classes:

B01D61/42; B01D61/46; B01D61/48; B01D61/50; B01D61/52; B01D61/54; B01D61/58; C02F1/469; C02F1/44; C02F9/00; (IPC1-7): C02F1/469; B01D61/52

Domestic Patent References:

WO2000023382A1

2000-04-27

Foreign References:

JP2002205069A	2002-07-23
JP2002086152A	2002-03-26
JP2000061271A	2000-02-29
JP2002205069A	2002-07-23

Other References: