Title:
WATER-TREATMENT METHOD AND DESALINIZATION METHOD
Document Type and Number:
WIPO Patent Application WO/2012/057176
Kind Code:
A1
Abstract:
A water-treatment method wherein filtered water, obtained by using a solid-liquid separation unit to perform solid-liquid separation on untreated water having a dissolved-oxygen level of 1 mg/L or greater, is treated using a reverse-osmosis membrane and/or a nanofiltration membrane. Performing gas cleaning, wherein a deoxidizing gas is used to clean the solid-liquid separation unit such that the dissolved-oxygen level of the aforementioned filtered water falls to 0.5 mg/L or below, minimizes biofouling of the reverse-osmosis membrane or nanofiltration membrane, without using chemical additives, when manufacturing high-quality water such as drinking water or industrial water by using a reverse-osmosis membrane or nanofiltration membrane to perform membrane treatment of filtered water obtained by using a solid-liquid separation unit to perform solid-liquid separation on untreated water such as seawater, river water, or post-secondary-treatment sewer water.
Inventors:
HANADA SHIGEHISA
ITO YOHITO
ITO YOHITO
Application Number:
PCT/JP2011/074617
Publication Date:
May 03, 2012
Filing Date:
October 26, 2011
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
HANADA SHIGEHISA
ITO YOHITO
HANADA SHIGEHISA
ITO YOHITO
International Classes:
C02F1/44; B01D65/08
Foreign References:
| JP2008183510A | 2008-08-14 | |||
| JP2007524501A | 2007-08-30 | |||
| JP2010069361A | 2010-04-02 | |||
| JP2009530072A | 2009-08-27 | |||
| JPH0295422A | 1990-04-06 |
Download PDF:
Claims: