Title:
WASTE WATER TREATMENT METHOD USING MEMBRANE SEPARATION-ACTIVATED SLUDGE
Document Type and Number:
WIPO Patent Application WO/2017/187878
Kind Code:
A1
Abstract:
In a waste water treatment method using membrane separation-activated sludge, when, during filtration while supplying air using an immersion-type membrane separation unit loaded with multiple flexible membranes, the filtration differential pressure of the membranes at a set filtration flow rate exceeds a specified value P2 with respect to the filtration differential pressure P1 of the initial period of operation, membrane filtration is continued with air supply stopped until the filtration differential pressure P3 becomes P3≥P1+20 [kPa]. Then with the filtration flux or filtration pressure being smaller or negative compared to when filtering while supplying air, air is supplied and after the filtration differential pressure P4 during filtration reaches P4≤P1+5 [kPa], filtration is returned to filtration while supplying air.
Inventors:
KANTANI SEIKO (JP)
ITO YOHITO (JP)
ANDO HIDEAKI (JP)
ITO YOHITO (JP)
ANDO HIDEAKI (JP)
Application Number:
PCT/JP2017/013292
Publication Date:
November 02, 2017
Filing Date:
March 30, 2017
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
C02F3/12; B01D63/08; B01D65/02; C02F1/44; C02F11/12
Domestic Patent References:
| WO2010113822A1 | 2010-10-07 | |||
| WO2011004743A1 | 2011-01-13 |
Foreign References:
| JP2000325998A | 2000-11-28 | |||
| US20140151299A1 | 2014-06-05 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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