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Method for cleaning ultrafiltration membrane

A technology of ultrafiltration membrane and cleaning solution, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as microbial pollution, achieve the effect of eliminating pollution and restoring performance

Active Publication Date: 2012-04-04
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] c) Microbial contamination: Microbial contamination is also a risk factor for the long-term safe operation of the filter membrane

Method used

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  • Method for cleaning ultrafiltration membrane
  • Method for cleaning ultrafiltration membrane
  • Method for cleaning ultrafiltration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: By monitoring the product water flow rate and the corresponding pressure drop, the product water pressure coefficient of the ultrafiltration membrane module can be calculated:

[0041]

[0042] Average pressure on the inlet side = (inlet pressure + concentrated water outlet pressure) ÷ 2 (cross-flow filtration)

[0043] Average pressure of water inlet side = inlet pressure (full flow filtration)

[0044] Draw a graph with the time as the abscissa and the pressure coefficient of the product water as the ordinate every day, which can judge the pollution degree of the ultrafiltration membrane module. If it is found that the curve drops by 20% compared with the beginning of operation, it means that the ultrafiltration membrane module has been polluted, and the ultrafiltration membrane module must be cleaned.

[0045] figure 1 As shown, the specific steps for cleaning the ultrafiltration membrane module are:

[0046] 1. Stop feeding sewage into the ultrafilt...

Embodiment 2

[0057] Embodiment 2: The acid cleaning solution of this embodiment adopts a citric acid solution with a concentration of 2%, and no alkaline cleaning solution is used for cleaning, and the rest of the cleaning steps are the same as in Example 1.

Embodiment 3

[0058] Embodiment three: the acid cleaning liquid of this embodiment adopts the hydrochloric acid solution that concentration is 0.4%, and other steps are identical with embodiment two.

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Abstract

The invention provides a method for cleaning an ultrafiltration membrane, which comprises a physical cleaning method and a chemical cleaning method. The physical cleaning method comprises a process of air scrubbing of ultrafiltration membrane components and a process of backwashing of the ultrafiltration membrane components. The process of air scrubbing of the ultrafiltration membrane comprises the following steps: ultrafiltration membrane components discharges concentrated water when compressed air is introduced, wherein the air inlet pressure of the ultrafiltration membrane components is less than 2.5 bar and more than 1.5 bar, compressed air is introduced for 1 minute, sewage in the ultrafiltration membrane components is exhausted after air scrubbing is completed, backwashing for once is carried out according to the backwashing process of the ultrafiltration membrane components. The chemical cleaning method comprises the following steps: carrying out forward cleaning circulation ofthe ultrafiltration membrane components; preparing an alkaline cleaner, carrying out forward cleaning circulation of the ultrafiltration membrane components; immersing the ultrafiltration membrane components. The method for cleaning the ultrafiltration membrane is capable of eliminating the pollution of the ultrafiltration membrane components, recovering the performance of the ultrafiltration membrane components, ensuring the normal operation of the ultrafiltration membrane components and prolonging the usage life of the ultrafiltration membrane components as long as possible.

Description

technical field [0001] The invention belongs to the field of sewage treatment, in particular to a chemical cleaning technology for ultrafiltration membranes. Background technique [0002] In the past 30 years, the development of ultrafiltration technology has been extremely rapid. It not only plays a unique role in the separation of special solutions, but also has more and more applications in the reuse of industrial sewage. It is often used as pretreatment equipment to ensure subsequent Long-term safe and stable operation of equipment. [0003] Ultrafiltration is a membrane separation technology whose membrane is a porous asymmetric structure. The filtration process is a solution separation process based on the pressure difference on both sides of the membrane and based on the principle of mechanical sieving. The operating pressure is usually 0.03-0.6MPa, the sieving pore size is from 0.005-0.1μm, and the molecular weight cut-off is 1000- 500,000 Daltons. One of its most...

Claims

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Application Information

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IPC IPC(8): B01D65/02C02F1/44
Inventor 贺占超赵瑞峰
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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