Title:
METHOD FOR OPERATING REVERSE OSMOSIS MEMBRANE DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/254972
Kind Code:
A1
Abstract:
Provided is a method that is for operating a reverse osmosis membrane device and that enables inhibiting deposition of silica during halting of the operation, and stable operation of the reverse osmosis membrane device after resuming the operation. This method is for operating a reverse osmosis membrane device, comprises a treatment step for passing, through a reverse osmosis membrane device 8, a to-be-treated water to which an acid has been added to have an acidic pH of 6 or less, and a halting step for halting passage of water through the reverse osmosis membrane device 8, and is characterized in that when the halting step has continued for at least a predetermined period of time, the water in the reverse osmosis membrane device 8 is replaced with dilute water.
Inventors:
GOTOU HIDEKI (JP)
Application Number:
PCT/JP2022/017565
Publication Date:
December 08, 2022
Filing Date:
April 12, 2022
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
B01D61/12; C02F1/44
Domestic Patent References:
| WO2009128328A1 | 2009-10-22 |
Foreign References:
| JP2015174030A | 2015-10-05 | |||
| JP2017064570A | 2017-04-06 | |||
| JPH07163979A | 1995-06-27 | |||
| JPH05317854A | 1993-12-03 | |||
| JP2018176033A | 2018-11-15 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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