Title:
WASTE WATER TREATMENT METHOD AND WASTE WATER TREATMENT APPARATUS
Document Type and Number:
WIPO Patent Application WO/2018/092365
Kind Code:
A1
Abstract:
In an insoluble material-generating apparatus 10, an iron salt and/or an aluminum salt and a cationic polymer flocculant are added to waste water containing dissolved substances to generate insoluble material. To the generated insoluble material-containing waste water, an anionic polymer flocculant is added, after which the waste water containing the anionic polymer flocculant and the insoluble material is stirred in a granulating flocculation precipitation tank 14, the insoluble material is granulated, and solid-liquid separation of the generated granulated material is performed to obtain treated water. The amount added of the iron salt or the aluminum salt is an iron or aluminum concentration of at least 0.4 mmol/L, and the cationic polymer flocculant and the anionic flocculant are added so that the product of the cationic polymer flocculant concentration and the cationic group percentage is equal to or less than the product of the anionic polymer flocculant concentration and the anionic group percentage.
Inventors:
MAEDA RINTAROU (JP)
TOBA YUICHIROU (JP)
TOBA YUICHIROU (JP)
Application Number:
PCT/JP2017/028606
Publication Date:
May 24, 2018
Filing Date:
August 07, 2017
Export Citation:
Assignee:
ORGANO CORP (JP)
International Classes:
C02F1/52; B01D21/00; B01D21/01; B01D21/02; B01D21/24; C02F1/56
Domestic Patent References:
| WO2014038537A1 | 2014-03-13 |
Foreign References:
| JP2011139997A | 2011-07-21 | |||
| JP2007275757A | 2007-10-25 | |||
| JPH02261505A | 1990-10-24 | |||
| JP2011194306A | 2011-10-06 | |||
| JP2004255349A | 2004-09-16 |
Attorney, Agent or Firm:
YKI PATENT ATTORNEYS (JP)
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