Title:
METHOD FOR WASHING MEMBRANE FILTRATION DEVICE AND WATER TREATMENT METHOD
Document Type and Number:
WIPO Patent Application WO/2020/026857
Kind Code:
A1
Abstract:
This washing method is designed for a membrane filtration device for filtering water to be treated containing at least one of iron, manganese, and ions and colloids thereof through a filtration membrane to provide treated water, and comprises: a first acid washing step of supplying sulfuric acid to the filtration membrane; and a second acid washing step of supplying an acid mixture of chloric acid and an organic acid to the filtrate membrane. The filtration membrane is a microfiltration membrane or an ultrafiltration membrane. In the process of washing the membrane filtration device for membrane-treating water to be treated containing at least one of iron, manganese, and ions and colloids thereof using the microfiltration membrane or an ultrafiltration membrane, the method for washing a membrane filtration device enables iron and manganese to be sufficiently removed from the filtration membrane.
Inventors:
NISHIDA TAKASHI (JP)
KIRITA SHINICHI (JP)
KIRITA SHINICHI (JP)
Application Number:
PCT/JP2019/028503
Publication Date:
February 06, 2020
Filing Date:
July 19, 2019
Export Citation:
Assignee:
OJI HOLDINGS CORP (JP)
International Classes:
B01D65/06; B01D61/04; B01D61/14; B01D61/58; B01D69/08; C02F1/44; C02F1/52
Foreign References:
| JP2007014829A | 2007-01-25 | |||
| JPH10118471A | 1998-05-12 | |||
| JP2017136571A | 2017-08-10 | |||
| JP2015077530A | 2015-04-23 |
Attorney, Agent or Firm:
SIKS & CO. (JP)
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