Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Membrane treatment method and device

A technology of membrane treatment and adding equipment, which is applied in the field of membrane treatment methods and equipment, and can solve problems such as unstable system operation, clogging, and increased membrane pressure difference

Inactive Publication Date: 2017-01-25
TORAY ADVANCED MATERIALS RES LAB CHINA
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pH of the solution has a certain influence on the surface electrical properties of powdered activated carbon. The pH of natural water bodies such as surface water is generally weakly alkaline (pH 7.0-8.5). The dosage of activated carbon is relatively large, and the dosage of different sources of water is usually 10mg / l-300mg / l, which is easy to form a filter cake layer on the membrane surface and cause membrane clogging (Zhang M M, et a1.2003, Environmental Science and Technology), Membrane differential pressure rises, resulting in unstable system operation

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
  • Membrane treatment method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Add 30mg / L powdered activated carbon to a certain raw water. After mixing for 30 minutes, the online pH meter of the water inlet pipeline tested that the pH was 8.1. After the test result was passed through the signal control device, the acid dosing device was started, and the hydrochloric acid was added and the pH was set at 5.5. The pH of the post-membrane inlet water is controlled at 5.5, and it enters the pressurized ultrafiltration membrane device from the raw water pump and the inlet water line for filtration. The membrane filtration flux is 2.5m / d, and the filtration cycle time is 30min. After washing for 1.0min, the membrane runs stably continuously, and the membrane chemical cleaning cycle exceeds 90 days.

Embodiment 2

[0024] Dosing 100mg / L powdered activated carbon into a raw water, after mixing for 60 minutes, the online pH meter of the water inlet pipeline tested that the pH was 7.5. Control at 6.0, enter the submerged ultrafiltration membrane device for filtration through the raw water pump and water inlet pipeline, the membrane filtration flux is 2.0m / d, the filtration cycle time is 30min, and then backwash and air wash for 1.0min respectively after draining, the membrane is continuous The operation is stable, and the chemical cleaning cycle of the membrane exceeds 60 days, which ensures the removal of organic matter and reduces the cleaning frequency of the membrane, prolonging the membrane service life.

Embodiment 3

[0029] A certain raw water enters the raw water tank 1 through the water inlet pipeline, and the powdered activated carbon dosing device 2 above the raw water tank 1 starts to add powdered activated carbon. After adding and staying in the raw water tank for 15 minutes, the online pH meter 5 on the raw water tank and the membrane module inlet pipeline tested 7.0, and the test result entered the signal control device 8 through the PLC control unit 7, and the signal control device 8 started the acid dosing device 3 and Set the pH to 5.5 for hydrochloric acid dosing. After adding hydrochloric acid, the pH of the influent water is controlled at 5.5. The raw water pump 4 enters the submerged ultrafiltration membrane module 6 for filtration. The membrane filtration flux is 1.5m / d, and the filtration cycle time is After draining for 30 minutes, backwashing and air washing for 1.0 minutes respectively, the membrane has been running stably for more than 90 days.

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

The invention discloses a membrane treatment method and a membrane treatment device. The method comprises the following steps: adding powdered activated carbon into a raw water tank 1, stirring the powdered activated carbon, putting the powdered activated carbon into a membrane assembly 6, arranging an on-line pH meter on a water feeding pipeline of the membrane assembly 6, and controlling the pH value through an acid feeding device 3 and a PLC unit 7. For small-molecular organic matters, the powdered activated carbon can be used for pretreatment for adsorption, but the surface of the powdered activated carbon adsorbing the organic matters is electrically changed, so that the powdered activated carbon is easily adsorbed to the surface of a membrane, and the membrane is polluted; according to the membrane treatment method, the pH value of a solution is adjusted to a weak acidity range to keep the surface of the powdered activated carbon in high electronegativity; therefore, the powdered activated carbon achieves a good pretreatment effect, membrane pollution is reduced, and the service life of the membrane is prolonged.

Description

technical field [0001] The invention belongs to the field of membrane water treatment, and in particular relates to a membrane treatment method and device. Background technique [0002] Membrane separation technology is more and more widely used in domestic water treatment fields. Ultra-microfiltration membranes mainly filter through the principle of membrane pore screening to remove particulate matter and a small amount of organic matter in water. In the process of membrane filtration, small molecular organic matter easily enters the membrane pores and causes blockage, which increases the pressure difference of the membrane module during actual operation and affects the operation of the entire system. Maintenance or periodic chemical cleaning of the membrane module is required to reduce the use of the membrane. life. [0003] At present, small molecular organics can be adsorbed by powdered activated carbon as a pretreatment. The surface of powdered activated carbon is most...

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): C02F9/04C02F1/44B01D65/08
Inventor 邹高辉常春杨瑜芳
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
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