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Patent Searching and Data


Title:
APPARATUS AND PROCESS FOR PRODUCING BOTH SALT AND FRESH WATER
Document Type and Number:
WIPO Patent Application WO/2010/137185
Kind Code:
A1
Abstract:
An apparatus which comprises: an electrodialyzer (14) which electrodialyzes pretreated water (13); an evaporator (16) in which the concentrated brine (15) resulting from the dialysis by the electrodialyzer (14) is evaporated; a dryer (19) in which the concentrated water (17) supplied from the evaporator (16) is dried to yield salt (18); a reverse osmosis membrane device (25) which includes an RO membrane (25a) and in which salts are removed from dilute brine containing an acid added thereto to thereby obtain fresh water as filtrate water (24); a recycling line through which part of the membrane-separated concentrated water (26) which has a heightened salt content is returned to a site located downstream from a pretreatment device (12); a drainage line through which the remaining concentrated water is discharged into the sea; and a controller (31) which controls the proportion between the amount of the membrane-separated concentrated water to be discharged into the sea and the amount of seawater to be fed.  By adding the acid (21), the pH is regulated to 7.3 or lower.  The salt (18) is obtained through the dryer (19), while the evaporated water (28) sent from the evaporator (16) is mixed with the filtrate water (24) sent from the reverse osmosis membrane device (25) to obtain product water (fresh water) (29).

Inventors:
TAKEUCHI KAZUHISA
ITO YOSHIAKI
KAKIGAMI HIDEMASA
IWAHASHI HIDEO
MATSUI KATSUNORI
TANAKA KENJI
Application Number:
PCT/JP2009/064061
Publication Date:
December 02, 2010
Filing Date:
August 07, 2009
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD (JP)
TAKEUCHI KAZUHISA
ITO YOSHIAKI
KAKIGAMI HIDEMASA
IWAHASHI HIDEO
MATSUI KATSUNORI
TANAKA KENJI
International Classes:
C02F9/00; B01D61/44; C02F1/44; C02F1/469
Foreign References:
JPH08318136A1996-12-03
JPH09290260A1997-11-11
JP2001087762A2001-04-03
JP2002292371A2002-10-08
JP2004033848A2004-02-05
JP2004290894A2004-10-21
JPH09276864A1997-10-28
JP2005279384A2005-10-13
JPH09276864A1997-10-28
JP2004033848A2004-02-05
JPH08318136A1996-12-03
JPH0889958A1996-04-09
Other References:
See also references of EP 2436657A4
Attorney, Agent or Firm:
SAKAI, Hiroaki et al. (JP)
Hiroaki Sakai (JP)
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