Title:
METHOD FOR PRODUCING RECYCLED WATER
Document Type and Number:
WIPO Patent Application WO/2022/215335
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method for producing recycled water, the method being capable of considerably reducing chemical cleaning of a membrane during the production of recycled water from waste water, and being capable of eliminating fouling of the membrane substantially by water washing only. The above are achieved by means of a method for producing recycled water, the method comprising the steps (A) to (D) described below.
(A) A step for performing an anaerobic treatment and an aerobic treatment by means of microorganisms on waste water that is discharged during the production process of PHA
(B) A step for subjecting the treated water obtained in step (A) to pretreatment filtration by means of a membrane separation activated sludge method
(C) A step for subjecting the treated water obtained in step (B) to an alkali treatment
(D) A step for filtering the treated water obtained in step (C) by means of an ion removal membrane
Inventors:
FUKUMOTO ASUKA (JP)
HIRANO MASARU (JP)
HIRANO MASARU (JP)
Application Number:
PCT/JP2022/003969
Publication Date:
October 13, 2022
Filing Date:
February 02, 2022
Export Citation:
Assignee:
KANEKA CORP (JP)
International Classes:
C02F1/44; B01D61/02; B01D61/14; B01D61/58; B01D65/08; C02F1/58; C02F1/60; C02F1/62; C02F1/64; C02F3/12; C02F3/30; C02F3/34; C12P1/00; C12P7/62
Domestic Patent References:
| WO2017221755A1 | 2017-12-28 | |||
| WO2008010296A1 | 2008-01-24 | |||
| WO2010067543A1 | 2010-06-17 |
Foreign References:
| JP2005254207A | 2005-09-22 | |||
| JP2006043611A | 2006-02-16 | |||
| JP2019136652A | 2019-08-22 | |||
| JPH0731489A | 1995-02-03 | |||
| JP2008193940A | 2008-08-28 | |||
| JPH0593049A | 1993-04-16 |
Attorney, Agent or Firm:
HARAKENZO WORLD PATENT & TRADEMARK (JP)
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