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Title:
REVERSE OSMOSIS MEMBRANE CONCENTRATED WATER TREATMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2019/111476
Kind Code:
A1
Abstract:
A method for treating concentrated water from reverse osmosis membranes, characterized by using a monovalent selective cation exchange membrane for some or all cation exchange membranes and treating the concentrated water using electrodialysis. The calcium concentration in the concentrated water from the reverse osmosis membrane is ideally at least 2 mM. At least one type out of hydrochloric acid, sulfuric acid, and nitric acid may be added to the water supplied to a concentration chamber and a scale inhibitor may also be added.

Inventors:
KAWAKATSU TAKAHIRO (JP)
CHUUMAN TAKAAKI (JP)
MURAMATSU ATSUSHI (JP)
KATO TERUHISA (JP)
Application Number:
PCT/JP2018/033474
Publication Date:
June 13, 2019
Filing Date:
September 10, 2018
Export Citation:
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Assignee:
KURITA WATER IND LTD (JP)
International Classes:
C02F1/469; B01D61/02; B01D61/44; B01D61/46; B01D61/54; C02F1/44; C02F5/00; C02F5/08; C02F5/14
Domestic Patent References:
WO2008153274A12008-12-18
Foreign References:
US20040055955A12004-03-25
JP2015029933A2015-02-16
JP2015524787A2015-08-27
JP2008223115A2008-09-25
JP2008100175A2008-05-01
JP2002292371A2002-10-08
JPH06269777A1994-09-27
JPH0747365A1995-02-21
JPH10323673A1998-12-08
JP2000000571A2000-01-07
JP2000140853A2000-05-23
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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