Title:
SYSTEM FOR PRODUCING FRESH WATER
Document Type and Number:
WIPO Patent Application WO/2012/120912
Kind Code:
A1
Abstract:
The purpose of the invention is to provide a system which uses an osmosis membrane to obtain fresh water from salt-containing raw water such as seawater, wherein the system produces fresh water at lower energy consumption. According to the present invention, the system for producing fresh water includes: a forward osmosis membrane processing means for removing salt from raw water via a forward osmosis membrane to obtain permeated water in a solution having an osmotic pressure higher than that of the raw water; a separating means for separating the solute component of the high-osmotic pressure solution, the high-osmotic pressure solution containing the permeated water obtained by the forward osmosis membrane processing means and Na2HPO4 or ethylene carbonate as the solute component; a reverse osmosis membrane processing means for desalinizing the solution separated from the solute component by the separating means as raw water through a reverse osmosis membrane to obtain fresh water; a pump for supplying the raw water to the reverse osmosis membrane processing means; and a pipe for mixing the solute component separated and collected by the separating means, in the high-osmosis pressure solution supplied to the forward osmosis membrane processing means.
Inventors:
YOKOI HIROTO (JP)
KAGEYAMA KOJI (JP)
SANGU YUTAKA (JP)
TADOKORO HIDEYUKI (JP)
TACHI TAKAHIRO (JP)
KAGEYAMA KOJI (JP)
SANGU YUTAKA (JP)
TADOKORO HIDEYUKI (JP)
TACHI TAKAHIRO (JP)
Application Number:
PCT/JP2012/050013
Publication Date:
September 13, 2012
Filing Date:
January 04, 2012
Export Citation:
Assignee:
HITACHI LTD (JP)
YOKOI HIROTO (JP)
KAGEYAMA KOJI (JP)
SANGU YUTAKA (JP)
TADOKORO HIDEYUKI (JP)
TACHI TAKAHIRO (JP)
YOKOI HIROTO (JP)
KAGEYAMA KOJI (JP)
SANGU YUTAKA (JP)
TADOKORO HIDEYUKI (JP)
TACHI TAKAHIRO (JP)
International Classes:
C02F1/44; B01D61/00; B01D61/04; B01D61/12; B01D61/58
Foreign References:
JP2010162527A | 2010-07-29 | |||
JP2007533884A | 2007-11-22 | |||
JP2004081913A | 2004-03-18 |
Attorney, Agent or Firm:
ASAMURA PATENT OFFICE, p. c. (JP)
Patent business corporation Asamura patent firm (JP)
Patent business corporation Asamura patent firm (JP)
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Claims: