Title:
SCALE CONTROL METHOD FOR REVERSE OSMOSIS MEMBRANE
Document Type and Number:
WIPO Patent Application WO/2019/171832
Kind Code:
A1
Abstract:
In the present invention, at a frequency of at least once every three days, pressure-release water passing is carried out by increasing the degree-of-opening of a backpressure valve of a reverse osmosis membrane, and allowing supplied water to pass at no more than 1/3 of the steady permeability flux. The permeated-water flow rate, the concentrated-water flow rate, and the amount of concentrated water that is circulating are monitored, and the backpressure valve is closed to the state prior to carrying out pressure-release water passing so that the concentration rate does not become higher than that prior to carrying out pressure-release water passing.
Inventors:
KAWAKATSU TAKAHIRO (JP)
Application Number:
PCT/JP2019/003092
Publication Date:
September 12, 2019
Filing Date:
January 30, 2019
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
B01D65/08; B01D61/12; B01D61/18; B01D61/58; B01D65/06; C02F1/44
Domestic Patent References:
| WO2016199725A1 | 2016-12-15 |
Foreign References:
| JP2001259374A | 2001-09-25 | |||
| JP2015160179A | 2015-09-07 | |||
| JP2016179442A | 2016-10-13 | |||
| JP2013049043A | 2013-03-14 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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