Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for suppressing slime in reverse osmosis membrane apparatus

A technology of reverse osmosis membrane and slime, applied in reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve problems such as increased operating costs and obstacles to continuous operation of reverse osmosis membrane devices

Inactive Publication Date: 2021-04-02
KURITA WATER INDUSTRIES LTD
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method will hinder the continuous operation of the reverse osmosis membrane device, resulting in an increase in operating costs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for suppressing slime in reverse osmosis membrane apparatus
  • Method for suppressing slime in reverse osmosis membrane apparatus
  • Method for suppressing slime in reverse osmosis membrane apparatus

Examples

Experimental program
Comparison scheme
Effect test

manufacture example

[0098] As a production example of sodium chlorosulfamate, for example, the method described in Example 1 of Japanese Patent No. 5720964 is mentioned.

[0099] Add component (B-1), that is, chloramine composed of ammonium salt and chlorine, so that the maintenance concentration in the system is preferably 0.5 to 7.0 mg / L (based on Cl concentration) in terms of total chlorine concentration. 2 ), more preferably 0.5-5.0 mg / L (as Cl 2 ), more preferably 1.0 to 3.0 mg / L (as Cl 2 count).

[0100] By maintaining the concentration of the above-mentioned component (B-1) in the system within the above-mentioned range, it is easy to obtain the effect of suppressing the generation of slime (biofilm) in a short time, and even if the slime (biofilm) is generated and attached to the reverse osmosis The film surface can also be used to remove slime (biofilm) by combining with DBNPA, which is a slime inhibitor X.

[0101] Add component (B-2), i.e. chlorosulfamic acid or chlorosulfamate, so ...

Embodiment 1

[0186] use figure 2 In the third system of the simulated device shown, open the valve and pass the treated water (raw water) prepared above for 7 consecutive days under the condition of 1.7 L / min. In addition, the nutrient prepared above was added to the treated water for 7 consecutive days under the condition of 1 mL / min, and the DBNPA reagent prepared above was added as the slime inhibitor X at a frequency of 30 minutes once a day, so that the system of DBNPA Keep the concentration at 10mg / L (in terms of DBNPA), and add the above-mentioned component (B-2) sodium monochlorosulfamate reagent as the slime inhibitor Y, so that the maintenance concentration in the system is 2.4mg in terms of total chlorine concentration / L (as Cl 2 count).

Embodiment 2

[0188] The kind of slime inhibitor Y among the embodiment 1 is changed into component (A), namely the mixture reagent of Cl-MIT and MIT, and the maintenance concentration in the system that changes into Cl-MIT is 1.5mg / L (with Cl-MIT In addition to this, the water passing process was carried out in the same manner as in Example 1, which was used as the slime suppression test in Example 2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Provided is a method for suppressing slime in a reverse osmosis membrane apparatus, the method achieving the advantageous effect of suppressing generation of slime (a biofilm) and by which the advantageous effect of removing slime (a biofilm) can be achieved in a short time even if slime (a biofilm) is generated and adheres to a surface of a reverse osmosis membrane. This method for suppressing slime is used in a reverse osmosis membrane apparatus and has a water-passing step for passing water to be treated through the reverse osmosis membrane. The water-passing step includes a first water-passing step in which a slime suppressing agent X which contains 2,2-dibromo-3-nitrilopropionamide (DBNPA) and a slime suppressing agent Y which contains at least one type selected from the group consisting of components (A) to (D) (which are as described in the description) are added to the water to be treated which has a pH of 10 or less, and the water to be treated, which contains the slime suppressing agent X and the slime suppressing agent Y, is passed through the reverse osmosis membrane.

Description

technical field [0001] The invention relates to a slime suppression method of a reverse osmosis membrane device. Background technique [0002] The reverse osmosis membrane (RO membrane) included in the reverse osmosis membrane device is used for the production of drinking water, the production of pure water, the reuse of wastewater, and the like. During the operation of the reverse osmosis membrane device, microorganisms such as bacteria contained in the water to be treated become slime (biofilm), adhere to the surface of the reverse osmosis membrane and proliferate, causing the problem of membrane clogging. [0003] Conventionally, as a method of removing the slime adhering to and proliferating on the surface of the reverse osmosis membrane, a method of stopping the operation of the reverse osmosis membrane device and washing the reverse osmosis membrane with chemicals such as caustic soda to remove the slime has been performed. However, this method hinders the continuous ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44A01N35/02A01N37/34A01N41/08A01N43/80A01N59/00A01N59/08A01P3/00B01D61/04C02F1/50
CPCA01N35/02A01N37/34A01N43/80A01N59/00A01N59/08B01D61/04C02F1/50A01N41/08B01D65/08B01D2321/168C02F1/441C02F2303/20C02F1/008C02F1/76Y02A20/131B01D61/025B01D65/02B01D2321/162B01D2321/40
Inventor 远藤由彦
Owner KURITA WATER INDUSTRIES LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com