Title:
ELECTRODEIONIZATION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2004/005196
Kind Code:
A1
Abstract:
An electrodeionization apparatus capable of removing silica and boron highly effectively. In particular, an electrodeionization apparatus comprising an anode compartment (17) having an anode (11), a cathode compartment (18) having a cathode (12) and concentrating compartments (15) and desalting compartments (16) which are alternately disposed by alternately arranging multiple anion exchange membranes (13) and cation exchange membranes (14) between the anode compartment (17) and the cathode compartment (18), wherein the desalting compartments (16) and the concentrating compartments (15) are each filled with an ion exchange body. The ratio (volume ratio) of anion exchange body/cation exchange body is in the range of 8/2 to 5/5. Deionized water is taken out by passing respective electrolytic water through the anode compartments (17) and the cathode compartments (18), passing concentrated water through the concentrating compartments (15) and passing raw water through the desalting compartments (16). Water whose silica or boron concentration is lower than that of raw water is passed through the concentrating compartments (16) as the concentrated water in the direction from the deionized water takeout side toward the raw water inflow side of the desalting compartments (16). At least portion of the concentrated water flowing out from the concentrating compartments (15) is discharged outside the system.
Inventors:
SATO SHIN (JP)
Application Number:
PCT/JP2003/007973
Publication Date:
January 15, 2004
Filing Date:
June 24, 2003
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
SATO SHIN (JP)
SATO SHIN (JP)
International Classes:
B01D61/48; B01D61/54; B01J47/08; C02F1/469; C02F1/42; (IPC1-7): C02F1/469; B01D61/48; B01J47/08
Domestic Patent References:
| WO1992011089A1 | 1992-07-09 | |||
| WO1997046492A1 | 1997-12-11 |
Foreign References:
| EP1222954A1 | 2002-07-17 | |||
| US5593563A | 1997-01-14 | |||
| JP2001314868A | 2001-11-13 | |||
| US5868915A | 1999-02-09 | |||
| EP1075868A2 | 2001-02-14 | |||
| EP1222954A1 | 2002-07-17 |
Other References:
See also references of EP 1520840A4
Attorney, Agent or Firm:
Shigeno, Tsuyoshi (5-10 Shinjuku 2-chom, Shinjuku-ku Tokyo, JP)
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