Title:
WATER SOFTENING DEVICE AND METHOD FOR REGENERATING SAME
Document Type and Number:
WIPO Patent Application WO/2022/065158
Kind Code:
A1
Abstract:
A water softening device comprising: a water softening tank in which raw water is softened with a weakly acidic cation-exchange resin; a pH adjustment tank; an electrolysis tank in which acid electrolysis water is generated; a conductivity measurement unit S1 that measures the conductivity of the raw water; a conductivity measurement unit S2 that measures the conductivity of the soft water obtained by passing through the water softening tank and the pH adjustment tank; a passed water amount detection unit that detects the cumulative amount of raw water passed through the water softening tank in a predetermined period; and a control unit that controls the passing of acid electrolysis water to the water softening tank. The control unit calculates the regeneration time for the weakly acidic cation-exchange resin on the basis of the amount of hard component adsorbed to the weakly acidic cation-exchange resin calculated from the difference between the conductivity of the raw water and the conductivity of the soft water and the cumulative amount of passing raw water, and executes a process of regenerating the weakly acidic cation-exchange resin by passing acid electrolysis water to the water softening tank during the calculated regeneration time.
Inventors:
MARUO YUKO
YANO HIROSHI
YANO HIROSHI
Application Number:
PCT/JP2021/033933
Publication Date:
March 31, 2022
Filing Date:
September 15, 2021
Export Citation:
Assignee:
PANASONIC IP MAN CO LTD (JP)
International Classes:
B01J39/07; B01J39/18; B01J41/07; B01J41/12; B01J49/53; B01J49/57; B01J49/85; C02F1/42; C02F1/461
Foreign References:
| JP2009165954A | 2009-07-30 | |||
| JP2006043549A | 2006-02-16 | |||
| JP2010194453A | 2010-09-09 | |||
| JP2005334798A | 2005-12-08 | |||
| JP2003220386A | 2003-08-05 | |||
| JP2019162607A | 2019-09-26 | |||
| JP2011030973A | 2011-02-17 | |||
| JP2009165954A | 2009-07-30 | |||
| JP2020158748A | 2020-10-01 |
Other References:
See also references of EP 4219007A4
Attorney, Agent or Firm:
ITO Masakazu et al. (JP)
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