Device and method for slowing down membrane pollution

A membrane fouling and membrane pool technology, applied in chemical instruments and methods, water/sewage treatment, water/sewage multi-stage treatment, etc. The effect of small head loss, low operating cost and high water production rate

Inactive Publication Date: 2020-06-19
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although ultrasound can destroy the filter cake layer on the membrane surface, long-term operation has the risk of reducing the life of the membrane module
Adding a stirring device in the membrane tank will reduce the packing density of the membrane components in the membrane tank

Method used

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  • Device and method for slowing down membrane pollution
  • Device and method for slowing down membrane pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Example 1 A method for slowing down membrane fouling, specifically comprising:

[0081] This embodiment is raw water treatment, and the content of dissolved organic carbon (DOC) in the water to be treated is 2-5 mg / L. Adopt conventional adsorption-membrane treatment process. Continue to add powdered activated carbon, 5mg / L per day. The raw water is pumped into the powdered activated carbon pool and then enters the membrane pool at 1L / h. The hydraulic retention time in the membrane pool is 0.5h. The membrane module is an ultrafiltration membrane, and the rotation mode of the membrane module is: helical intermittent rotation (times / 6h), forward and reverse rotation each 1 turn, helix height 1cm, each rotation 10 minutes, rotation frequency 20rpm / min. After 15 days of continuous operation, the transmembrane pressure difference increased to 17kPa.

Embodiment 2

[0084] Example 2 A method for slowing down membrane fouling, specifically comprising:

[0085] This embodiment is raw water treatment, and the content of dissolved organic carbon (DOC) in the water to be treated is 2-5 mg / L. Conventional coagulation membrane treatment process (conventional equipment including independent coagulation unit, precipitation unit and membrane treatment unit) is adopted. Continue to add aluminum salt coagulant, calculated as aluminum, 5mg / L per day. Among them, the mechanical stirring is fast rotation (200rpm) 1min, slow rotation (50rpm) 15min. Pump the raw water into the coagulation tank, pass through the sedimentation tank and then enter the membrane tank at 1L / h. The hydraulic retention time in the membrane tank is 0.5h. The membrane module is an ultrafiltration membrane, and the rotation mode of the membrane module is: reciprocating intermittent rotation (times / 6h), forward and reverse rotation each 1 circle, each rotation is 10 minutes, and ...

Embodiment 3

[0088] Example 3 A method for slowing down membrane fouling, specifically comprising:

[0089] This embodiment is raw water treatment, and the content of dissolved organic carbon (DOC) in the water to be treated is 2-5 mg / L. Short-flow process (conventional equipment including independent coagulation unit and membrane treatment unit) is adopted. Continue to add aluminum salt coagulant, calculated as aluminum, 5mg / L per day. Among them, the mechanical stirring is fast rotation (200rpm) 1min, slow rotation (50rpm) 15min. Pump the raw water into the coagulation tank, and enter the membrane tank at 1L / h. The hydraulic retention time in the membrane tank is 0.5h. The membrane module is an ultrafiltration membrane, and the rotation mode of the membrane module is: helical intermittent rotation (6h / time), forward and reverse rotation each 1 turn, helix height 1cm, each rotation 10 minutes, rotation frequency 20rpm / min. After 15 days of continuous operation, the transmembrane pres...

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Abstract

The invention provides a device and method for slowing down membrane pollution, and belongs to the field of membrane pollution control. According to the method, in an adsorption-membrane combination process, to-be-treated water enters a rotating membrane assembly after being adsorbed by an adsorbent. The method is mainly applied to the technical field of membrane pollution control, is simple to operate, economical and practical, and breaks through serious membrane pollution caused by large filter cake layer thickness, high compactness and the like due to standing of a membrane assembly in an existing adsorption-membrane combination process.

Description

technical field [0001] The invention belongs to the field of membrane pollution control, and in particular relates to a device and method for slowing down membrane pollution. Background technique [0002] In recent years, the theory and application of membrane purification has become a research hotspot in this field, and membrane treatment technology has also been widely used in actual water purification projects. Although the application of membrane technology in water treatment is becoming more and more common, membrane fouling is always the bottleneck that reduces the water purification efficiency of membranes, which greatly restricts the large-scale application of membranes. Therefore, how to effectively control and slow down membrane fouling has become a research hotspot and difficulty in water treatment technology. [0003] The main cause of membrane fouling is the adsorption / blockage of pollutants in the membrane pores and the formation of a filter cake layer on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02
CPCC02F1/008C02F1/28C02F1/444C02F2303/14C02F2303/16
Inventor 马百文王博东薛文静胡承志刘会娟曲久辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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