Title:
WASTE WATER TREATMENT METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/089927
Kind Code:
A1
Abstract:
In this invention, raw water is introduced into a reaction tank 2 to be mixed with slaked lime added return sludge from a reforming tank 8, and then in a flocculation tank 3, flocculation treatment is carried out by addition of polymer flocculant. A flocculation treatment liquid is introduced into a sedimentation tank 4 and the sludge is separated. A part of the sludge is introduced into the reforming tank 8 by a sludge return line 7. A sludge retention time in the reforming tank 8 is set to 1 to 5 minutes. The reforming tank 8 is disposed above the reaction tank 2, and a sludge outflow pipe 23 connected to a sludge outlet 21 of the reforming tank 8 is extended vertically downward.
Inventors:
WATANABE YU (JP)
Application Number:
PCT/JP2022/034057
Publication Date:
May 25, 2023
Filing Date:
September 12, 2022
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
C02F1/58; C02F1/52; C02F1/62; C02F1/64
Foreign References:
| JPH08132066A | 1996-05-28 | |||
| JP2010234300A | 2010-10-21 | |||
| JP2011189336A | 2011-09-29 | |||
| JP2009022873A | 2009-02-05 | |||
| JP2006255623A | 2006-09-28 | |||
| JP2011177640A | 2011-09-15 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi et al. (JP)
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