Title:
REVERSE OSMOSIS MEMBRANE SILICA SCALE SUPPRESSION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/111474
Kind Code:
A1
Abstract:
A method for suppressing silica scale in a reverse osmosis membrane during water treatment in which silica-containing supply water is caused to flow through the reverse osmosis membrane. When the water volume supplied to a reverse osmosis membrane is VFm3/d, the concentrated water volume is VCm3/d, and the silica concentration in the supplied water is CSmg/L and when the relationship in formula (1) is fulfilled, pressure release flow is used whereby the permeation flow rate of the reverse osmosis membrane is set to no more than 0.6 m/d, a back pressure valve is opened at least once every three days, and supply water is caused to flow at no more than 1/3 of the set permeation flow rate. CS × VF/VC > 120 (1)
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Inventors:
KAWAKATSU TAKAHIRO (JP)
Application Number:
PCT/JP2018/033471
Publication Date:
June 13, 2019
Filing Date:
September 10, 2018
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
C02F1/44; B01D61/04; B01D61/58; C02F5/00; C02F5/10
Foreign References:
| JP2016179442A | 2016-10-13 | |||
| JP2015160179A | 2015-09-07 | |||
| JP2012183472A | 2012-09-27 | |||
| JP2016187788A | 2016-11-04 | |||
| JPH08206656A | 1996-08-13 | |||
| CN103693799A | 2014-04-02 |
Other References:
"Membrane Element CPA5-LD", 17 March 2016 (2016-03-17), XP055614519, Retrieved from the Internet [retrieved on 20181129]
"Low Fouling Brackish Water RO Elements TML20N-400", LENNTECH, 26 May 2011 (2011-05-26), pages 1 - 2, XP055614520, Retrieved from the Internet [retrieved on 20181129]
"Low Fouling Brackish Water RO Elements TML20N-400", LENNTECH, 26 May 2011 (2011-05-26), pages 1 - 2, XP055614520, Retrieved from the Internet
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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