Title:
METHOD FOR SUPPRESSING SILICA SCALE OF REVERSE OSMOSIS MEMBRANE
Document Type and Number:
Japanese Patent JP2019098298
Kind Code:
A
Abstract:
To provide water containing silica such as river water or ground water is treated as a feed water with a reverse osmosis membrane to produce pure water, the silica scale is suppressed to stabilize the membrane performance.SOLUTION: In water treatment in which feed water containing silica is passed through the reverse osmosis membrane, representing that the amount of feed water to the reverse osmosis membrane is VFm/d, the amount of concentrate water is VCm/d, and the silica concentration in the feed water is CSmg/L, and when the following equation (1) is satisfied, a method for suppressing silica scale of a reverse osmosis membrane sets the permeation flux of the reverse osmosis membrane to 0.6 m/d or less and open the back pressure valve at least 1 time every 3 days, and performs pressure-release water passing through feed water at one third or less of the set permeation flux. CS×VF/VC>120 (1).SELECTED DRAWING: Figure 3
Inventors:
KAWAKATSU TAKAHIRO
Application Number:
JP2017235261A
Publication Date:
June 24, 2019
Filing Date:
December 07, 2017
Export Citation:
Assignee:
KURITA WATER IND LTD
International Classes:
C02F1/44; B01D61/04; B01D61/58; C02F5/00; C02F5/10
Domestic Patent References:
| JP2016179442A | 2016-10-13 | |||
| JP2015160179A | 2015-09-07 | |||
| JP2012183472A | 2012-09-27 | |||
| JP2016187788A | 2016-11-04 | |||
| JPH08206656A | 1996-08-13 | |||
| JP2014195754A | 2014-10-16 | |||
| JP2015174018A | 2015-10-05 |
Foreign References:
| CN103693799A | 2014-04-02 |
Other References:
MEMBRANE ELEMENT CPA5-LD [ONLINE], JPN6018048347, 10 September 2016 (2016-09-10), ISSN: 0004215910
LOW FOULING BRACKISH WATER RO ELEMENTS TML20N-400 [ONLINE], JPN6018048348, 29 August 2017 (2017-08-29), ISSN: 0004215911
LOW FOULING BRACKISH WATER RO ELEMENTS TML20N-400 [ONLINE], JPN6018048348, 29 August 2017 (2017-08-29), ISSN: 0004215911
Attorney, Agent or Firm:
Tsuyoshi Shigeno
Takayuki Shigeno
Takayuki Shigeno