Title:
DESALINATION APPARATUS AND DESALINATION METHOD, METHOD FOR PRODUCING FRESH WATER, AND METHOD FOR CO-PRODUCING FRESH WATER, SALT AND VALUABLE-MATERIAL
Document Type and Number:
Japanese Patent JP2015029931
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a desalination apparatus and desalination method capable of removing multivalent ions contained in the desalinated water from an electrodialysis unit and improving the purity of the recovered valuable-material, and to provide a method for producing fresh water, and a method for co-producing fresh water, salt and valuable-material.SOLUTION: The desalination apparatus comprises: a reverse osmosis membrane unit 12 for obtaining a fresh water Wwhose salt content contained in supplied feed seawater (raw water) W has been removed and a salt-content enriched water Wwhose salt content in the feed seawater W has been enriched; an electrodialysis unit 13 for obtaining an enriched saline water Wand a diluted saline water Wby electrodialyzing the salt-content enriched water W; desalination means (for example a filtration membrane separation unit comprising NF membrane/RO membrane) 15 for enriching multivalent ions and permeating mono-valent ions in the diluted saline water W; and a recirculation line Lfor recirculating the permeated water Wcontaining mono-valent ions that has been permeated by the desalination means 15, to the feed seawater (raw water) W on the inlet side of the reverse osmosis membrane unit 12.
Inventors:
KAKIUE HIDEMASA
ITO YOSHIAKI
TABATA MASAYUKI
MATSUI KATSUNORI
TOKUNAGA KIICHI
HORIZOE KOJI
ITO YOSHIAKI
TABATA MASAYUKI
MATSUI KATSUNORI
TOKUNAGA KIICHI
HORIZOE KOJI
Application Number:
JP2013159848A
Publication Date:
February 16, 2015
Filing Date:
July 31, 2013
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
C02F1/44; B01D9/02; B01D61/02; B01D61/44; B01D61/46; B01D61/58; C02F1/04; C02F1/469; C02F9/00
Domestic Patent References:
| JPH10314715A | 1998-12-02 | |||
| JP2003212537A | 2003-07-30 | |||
| JP2004033848A | 2004-02-05 | |||
| JP2012213767A | 2012-11-08 |
Foreign References:
| US20040055955A1 | 2004-03-25 |
Attorney, Agent or Firm:
Hiroaki Sakai
Jun Takamura
Jun Takamura