Title:
WATER TREATMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2015/083717
Kind Code:
A1
Abstract:
This water treatment method, which is used in a fresh water generation method for obtaining fresh water by means of pre-processing with a porous separation membrane and then a reverse osmosis membrane, contains: a filtration step that provides treated water to a membrane filtration device housing the porous separation membrane, and then performs filtration treatment to obtain filtered water; a water drain step for draining the treated water concentrated within the membrane filtration device and separated by the porous separation membrane; and a cleaning step for cleaning the porous separation membrane by means of physical cleaning and/or chemical cleaning. Filtered water is obtained by repeating a plurality of times a cycle resulting from combining the filtration step, water drain step, and cleaning step. In one cycle, the filtration step and water drain step are repeated a plurality of times and then the cleaning step is executed.
Inventors:
MAEDA TOMOHIRO (JP)
TANIGUCHI MASAHIDE (JP)
ITO YOHITO (JP)
TANIGUCHI MASAHIDE (JP)
ITO YOHITO (JP)
Application Number:
PCT/JP2014/081910
Publication Date:
June 11, 2015
Filing Date:
December 02, 2014
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C02F1/44; B01D61/04; B01D61/58; B01D65/02
Foreign References:
| JP2007330916A | 2007-12-27 | |||
| JPH04271818A | 1992-09-28 | |||
| JP2004130307A | 2004-04-30 | |||
| JPS61249592A | 1986-11-06 | |||
| JP2001087780A | 2001-04-03 | |||
| US20050194315A1 | 2005-09-08 | |||
| US4898667A | 1990-02-06 |
Attorney, Agent or Firm:
HAMADA Yuriko et al. (JP)
Yuriko Hamada (JP)
Yuriko Hamada (JP)
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