Title:
WATER TREATMENT METHOD AND WATER TREATMENT FACILITY
Document Type and Number:
Japanese Patent JP2020039993
Kind Code:
A
Abstract:
To provide a water treatment method capable of efficiently suppressing biofouling in a first membrane separation part for subjecting water to be treated to membrane separation with a reverse osmosis membrane and a second membrane separation part for subjecting concentrated water separated in the membrane separation part to membrane separation with a reverse osmosis membrane.SOLUTION: A water treatment method includes a membrane separation step of subjecting water to be treated to membrane separation in a first membrane separation part having a reverse osmosis membrane to obtain concentrated water and subjecting the concentrated water obtained in the first membrane separation part to membrane separation in a second membrane separation part having a reverse osmosis membrane, wherein the membrane separation step includes subjecting the water to be treated containing a chlorine-based oxidant and a slime control agent to the membrane separation in the first membrane separation part, and the slime control agent is at least one selected from the group consisting of 5-chloro-2-methyl-4-isothiazoline-3-one (CMIT), 2-methyl-4-isothiazoline-3-one (MIT), 2,2-dibromo-3-nitropropionamide (DBNPA), and 2-bromo-2-nitropropane-1,3-diol (bronopol).SELECTED DRAWING: Figure 1
Inventors:
KONISHI YOSHIO
FUJII TADASHI
MURASE ISAO
FUJII TADASHI
MURASE ISAO
Application Number:
JP2018166729A
Publication Date:
March 19, 2020
Filing Date:
September 06, 2018
Export Citation:
Assignee:
KOBELCO ECO SOLUTIONS CO LTD
International Classes:
C02F1/44; B01D61/10; B01D61/58; B01D65/08; C02F1/50; C02F1/72; C02F1/76
Domestic Patent References:
| JP2018114472A | 2018-07-26 | |||
| JP2009247992A | 2009-10-29 | |||
| JP2018069120A | 2018-05-10 | |||
| JP2015199020A | 2015-11-12 | |||
| JP2002320968A | 2002-11-05 |
Foreign References:
| WO2010113857A1 | 2010-10-07 |
Attorney, Agent or Firm:
Fujimoto Partners Corporation