Title:
WASTEWATER TREATMENT METHOD AND WASTEWATER TREATMENT APPARATUS
Document Type and Number:
WIPO Patent Application WO/2021/045107
Kind Code:
A1
Abstract:
This wastewater treatment method comprises a soft water treatment step 1 of removing calcium carbonate from a wastewater by crystallizing the calcium carbonate, and an electrolysis step 2 of carrying out electrolysis on a portion of the wastewater from which the calcium carbonate has been removed, to obtain an acidic aqueous solution and an alkaline aqueous solution. At least a portion of the alkaline aqueous solution is circulated and used in the soft water treatment step 1.
Inventors:
MATSUI YASUHIRO (JP)
KOMATSU HIDEKI (JP)
ISHII YASUHIRO (JP)
OZAWA MANABU (JP)
NISHIKI YOSHINORI (JP)
KATO MASAAKI (JP)
MORITA RIE (JP)
KOMATSU HIDEKI (JP)
ISHII YASUHIRO (JP)
OZAWA MANABU (JP)
NISHIKI YOSHINORI (JP)
KATO MASAAKI (JP)
MORITA RIE (JP)
Application Number:
PCT/JP2020/033272
Publication Date:
March 11, 2021
Filing Date:
September 02, 2020
Export Citation:
Assignee:
YOKOGAWA ELECTRIC CORP (JP)
DE NORA PERMELEC LTD (JP)
DE NORA PERMELEC LTD (JP)
International Classes:
B01D61/08; B01D61/46; C02F1/44; C02F1/461; C02F1/469; C02F1/58
Foreign References:
| JP2011056345A | 2011-03-24 | |||
| JP2014014738A | 2014-01-30 | |||
| JPH06269777A | 1994-09-27 | |||
| JPH09299953A | 1997-11-25 | |||
| JPH07171564A | 1995-07-11 | |||
| JP2019162106A | 2019-09-26 | |||
| JP2014014738A | 2014-01-30 | |||
| JPH081168A | 1996-01-09 |
Other References:
See also references of EP 4026606A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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