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Patent Searching and Data


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)
Application Number:
PCT/JP2012/050013
Publication Date:
September 13, 2012
Filing Date:
January 04, 2012
Export Citation:
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Assignee:
HITACHI LTD (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:
JP2010162527A2010-07-29
JP2007533884A2007-11-22
JP2004081913A2004-03-18
Attorney, Agent or Firm:
ASAMURA PATENT OFFICE, p. c. (JP)
Patent business corporation Asamura patent firm (JP)
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Claims: