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Title:
AMMONIA CONCENTRATION METHOD AND AMMONIA CONCENTRATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2022/024414
Kind Code:
A1
Abstract:
The present invention provides an ammonia concentration method and an ammonia concentration device, each of which is capable of suppressing biofouling, while maintaining the recovery rate of ammonia in a concentration process of water to be processed containing ammonia, said concentration process using a semipermeable membrane module that is provided with a cellulose acetate semipermeable membrane. An ammonia concentration method which comprises a semipermeable membrane processing step wherein, with use of a semipermeable membrane module that has a first space (16) and a second space (18) separated from each other by means of a cellulose acetate semipermeable membrane (14), ammonia concentrated water is obtained by flowing water to be processed containing ammonia into the first space (16) and applying a pressure to the first space (16), thereby causing water contained in the water to be processed to permeate through the semipermeable membrane (14), while dilute water is obtained by flowing some of the water to be processed or at least some of the ammonia concentrated water into the second space (18). With respect to this ammonia concentration method, the water to be processed is caused to contain a stabilized hypobromite composition that contains a bromine-based oxidant and a sulfamic acid compound.

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Inventors:
KAJIWARA YUKO (JP)
TAKADA AKIHIRO (JP)
NAKANO TORU (JP)
Application Number:
PCT/JP2021/002421
Publication Date:
February 03, 2022
Filing Date:
January 25, 2021
Export Citation:
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Assignee:
ORGANO CORP (JP)
International Classes:
B01D61/02; B01D61/58; B01D71/16; C02F1/44
Domestic Patent References:
WO2020071177A12020-04-09
Foreign References:
JP2018069124A2018-05-10
JP2019098205A2019-06-24
JP2018202358A2018-12-27
Attorney, Agent or Firm:
YKI INTELLECTUAL PROPERTY ATTORNEYS (JP)
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