Title:
SEAWATER TREATMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2013/099857
Kind Code:
A1
Abstract:
In a seawater treatment method which comprises subjecting seawater to coagulation with a coagulant and solid-liquid separation and then conducting RO treatment of the resulting seawater, the present invention makes it possible to provide high-quality feed water for the RO treatment, even when the amount of the coagulant added is reduced. The use of this high-quality feed water enables the RO treatment to be stably conducted over a long period. This seawater treatment method is a method for pre-treating seawater prior to membrane separation, said method being characterized by adding a cationic organic flocculant and/or an inorganic coagulant to seawater to conduct reaction, thereafter adding an alkaline solution of a high-molecular compound which has a phenolic hydroxyl group and which is insolubilized under a high salt concentration to the resulting seawater to conduct agglomeration, and then subjecting the thus treated seawater to solid-liquid separation. The treated seawater obtained by the method is thereafter desalinated by membrane separation.
Inventors:
OI YASUHIRO (JP)
IUCHI TOMOYA (JP)
IUCHI TOMOYA (JP)
Application Number:
PCT/JP2012/083454
Publication Date:
July 04, 2013
Filing Date:
December 25, 2012
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
B01D61/02; B01D21/01; B01D61/04; C02F1/44; C02F1/56
Domestic Patent References:
| WO2011018978A1 | 2011-02-17 |
Foreign References:
| JP2010131469A | 2010-06-17 | |||
| JP2010017688A | 2010-01-28 | |||
| JPS57204206A | 1982-12-14 | |||
| JP2004337671A | 2004-12-02 | |||
| JP2011072866A | 2011-04-14 | |||
| JP2007007563A | 2007-01-18 | |||
| JP2009297688A | 2009-12-24 | |||
| JP2009226373A | 2009-10-08 |
Other References:
MATERIAL STAGE, vol. 10, no. 1, 10 April 2010 (2010-04-10), pages 20 - 22
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi (JP)
Takeshi Shigeno (JP)
Takeshi Shigeno (JP)
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Claims: