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Method for washing ultrafiltration membrane by combining ultrasonic waves and chemical cleaning agent

A chemical cleaning and ultrafiltration membrane technology, applied in the field of membrane cleaning, can solve the problems of secondary pollution application range, low cleaning efficiency, and high cost price, and achieve the effects of reducing dosage, saving cost, and reducing transmembrane pressure difference

Inactive Publication Date: 2017-01-04
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem to be solved in the present invention is to provide a chemical cleaning and ultrasonic effective The method of cleaning ultrafiltration membrane with ultrasonic wave combined with chemical cleaning agent to enhance the effect of chemical cleaning and save the amount of chemical cleaning

Method used

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  • Method for washing ultrafiltration membrane by combining ultrasonic waves and chemical cleaning agent
  • Method for washing ultrafiltration membrane by combining ultrasonic waves and chemical cleaning agent
  • Method for washing ultrafiltration membrane by combining ultrasonic waves and chemical cleaning agent

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for cleaning an ultrafiltration membrane using ultrasonic waves combined with a chemical cleaning agent, specifically comprising the following steps:

[0025] Firstly, backwash the ultrafiltration membrane with air and water for 10 minutes, and then discharge all the sewage in the ultrafiltration membrane module; prepare a chemical cleaning solution with a mass concentration of 0.05% sodium hypochlorite, inject it into the ultrafiltration membrane membrane pool to submerge the membrane module, and soak for 2.5 hours ; Then filter, backwash cycle, and load frequency of 40kHz ultrasonic wave to assist chemical cleaning; finally inject a hydrochloric acid solution with a mass concentration of 0.1% to immerse the membrane assembly, soak for 2.5h, then filter, backwash cycle, and load frequency at the same time 30kHz ultrasonic assists in chemical cleaning;

[0026] After cleaning, the membrane flux of the ultrafiltration membrane can be restored to 94%, and the tra...

Embodiment 2

[0028] A method for cleaning an ultrafiltration membrane using ultrasonic waves combined with a chemical cleaning agent, specifically comprising the following steps:

[0029] Firstly, backwash the ultrafiltration membrane with air and water for 12 minutes, and then discharge all the sewage in the ultrafiltration membrane module; prepare a chemical cleaning solution with a mass concentration of 0.1% sodium hypochlorite, inject it into the ultrafiltration membrane membrane pool to submerge the membrane module, and soak for 3 hours; Then carry out filtration, backwashing cycle, and at the same time load ultrasonic waves with a frequency of 50kHz to assist chemical cleaning; finally inject a hydrochloric acid solution with a mass concentration of 0.15% to immerse the membrane assembly, soak for 3h, then perform filtration, backwash cycle, and load a frequency of 50kHz at the same time Ultrasonic assisted chemical cleaning;

[0030] After cleaning, the membrane flux of the ultrafil...

Embodiment 3

[0032] A method for cleaning an ultrafiltration membrane using ultrasonic waves combined with a chemical cleaning agent, specifically comprising the following steps:

[0033] Firstly, backwash the ultrafiltration membrane with air and water for 15 minutes, and then discharge all the sewage in the ultrafiltration membrane module; prepare a chemical cleaning solution with a mass concentration of 0.15% sodium hypochlorite, inject it into the ultrafiltration membrane membrane pool to submerge the membrane module, and soak for 4 hours; Then filter, backwash cycle, and load frequency of 40kHz ultrasonic to assist chemical cleaning; finally inject a hydrochloric acid solution with a mass concentration of 0.2% to immerse the membrane assembly, soak for 4h, then filter, backwash cycle, and load frequency of 40kHz at the same time Ultrasonic assisted chemical cleaning;

[0034] After cleaning, the membrane flux of the ultrafiltration membrane can be restored to 95%, and the transmembran...

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Abstract

The invention discloses a method for washing an ultrafiltration membrane by combining ultrasonic waves and a chemical cleaning agent. The method comprises the following steps: washing the ultrafiltration membrane which is operated for a period of time, wherein the washing step is divided into physical washing and chemical washing; firstly, carrying out combined water and air backwashing on the ultrafiltration membrane and discharging all sewage in an ultrafiltration membrane assembly; preparing a sodium hypochlorite chemical washing solution and injecting the sodium hypochlorite chemical washing solution into an ultrafiltration membrane pool until the membrane assembly is immersed; immersing; then performing filtering and circulating backwashing; meanwhile, loading the ultrasonic waves to assist the chemical washing; finally, injecting a hydrochloric acid solution to immerse the membrane assembly, and immersing; then performing filtering and circulating backwashing; meanwhile, loading the ultrasonic waves to assist the chemical washing. Compared with the prior art, the method has the beneficial effects that an optimal medicament mass concentration and optimal ultrasonic frequency are obtained; ultrasonic wave assisting is added on the basis of the chemical washing to help to enhance the chemical washing effect and save medicament washing amount, so that the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of membrane cleaning, and relates to a method for cleaning ultrafiltration membranes by using ultrasonic waves combined with chemical cleaning agents. Background technique [0002] In the past 20 years, membrane technology has developed rapidly and has become a new technology for efficient sewage treatment. Compared with the traditional treatment method, it has the advantages of high volume load, high organic matter removal rate, small footprint and easy automatic control. However, the problem of membrane fouling is still a difficult problem hindering the development of membrane separation technology, which seriously affects the stability of the process. And economy, limit its wide use, and membrane cleaning is an effective way to prolong membrane life. [0003] The domestic and foreign research on alleviating ultrafiltration membrane fouling mainly focuses on the following three aspects: optimization of me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D61/14B01D61/20
CPCB01D65/02B01D61/145B01D61/20B01D2321/04B01D2321/162B01D2321/168B01D2321/18B01D2321/2075
Inventor 袁旭音周睿韩磊章琪
Owner HOHAI UNIV
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