Title:
TREATMENT METHOD FOR FLUORINE- AND ALUMINUM-CONTAINING WATER
Document Type and Number:
WIPO Patent Application WO/2023/234047
Kind Code:
A1
Abstract:
The present invention provides a treatment method for fluorine- and aluminum-containing water, wherein a chelating agent is added to the fluorine- and aluminum-containing water at a concentration that, by weight, is not less than 100 times the aluminum concentration in the fluorine- and aluminum-containing water, and then water is passed through a reverse osmosis membrane device. The pH of the fluorine- and aluminum-containing water is preferably 4 to 6. The chelating agent is preferably EDTA. The F ion concentration in the water to be treated is preferably 50-700 mg/L, and the Al ion concentration therein is preferably 0.01-1 mg/L.
Inventors:
KAMEDA HIDEKUNI (JP)
Application Number:
PCT/JP2023/018560
Publication Date:
December 07, 2023
Filing Date:
May 18, 2023
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
C02F1/44; B01D61/02
Foreign References:
| JP2014213264A | 2014-11-17 | |||
| JP2001149950A | 2001-06-05 | |||
| JP2001104955A | 2001-04-17 | |||
| JP2020121278A | 2020-08-13 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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