MULTI-STAGE REVERSE OSMOSIS MEMBRANE DEVICE, AND OPERATION METHOD THEREFOR

WIPO Patent Application WO/2014/129399

A1

　A multi-stage reverse osmosis membrane treatment in which the quality of the treated water is improved without sacrificing stability. Raw water in a raw water tank (1) is pressurized by a first pump (2) and supplied to a first reverse osmosis membrane device (3) in a first stage, the concentrate is discharged, and the permeate is introduced into an intermediate tank (5) via a pipe (4). The water in the intermediate tank (5) is pressurized by a second pump (6) and supplied to a second reverse osmosis membrane device (7) in a second stage, the permeate is extracted via a pipe (8) and the concentrate is returned to the raw water tank (1) via a pipe (9). In the first stage, the raw water spacer of the reverse osmosis membrane device has a thickness greater than 0.6 mm, and in the second stage, the raw water spacer of the reverse osmosis membrane device has a thickness of 0.6 mm or less.

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HAYAKAWA KUNIHIRO (JP)
KAWAKATSU TAKAHIRO (JP)

PCT/JP2014/053472

August 28, 2014

February 14, 2014

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KURITA WATER IND LTD (JP)

C02F1/44; B01D61/08; B01D61/58; B01D63/00; B01D63/10

JP2007152265A	2007-06-21
JP2000262867A	2000-09-26
JP2000237554A	2000-09-05
JP2006507919A	2006-03-09
JP2007523744A	2007-08-23
JPH10230143A	1998-09-02

SHIGENO, Tsuyoshi (JP)
Takeshi Shigeno (JP)

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