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Cleaning method of immersion membrane filtration system

A technology of submerged membrane and filtration system, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of short service life of membrane components, prolong service life, avoid operation errors, and improve cleaning efficiency Effect

Inactive Publication Date: 2012-06-06
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to improve the conventional cleaning method for the problems existing in the cleaning of submerged ultrafiltration or microfiltration membrane systems; These two parameters are used to judge the degree of membrane fouling, and through automatic control to achieve effective general cleaning and chemically enhanced cleaning for submerged membranes, membrane fouling can be controlled in time, which not only ensures the stable operation of the membrane system, but also avoids The problem of short service life of membrane modules caused by excessive fouling of membranes

Method used

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  • Cleaning method of immersion membrane filtration system
  • Cleaning method of immersion membrane filtration system
  • Cleaning method of immersion membrane filtration system

Examples

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Effect test

Embodiment 1

[0033] This test uses a certain surface raw water, its turbidity is about 10NTU, COD Mn At about 3mg / L, iron at about 0.3mg / L. The raw water quality belongs to Class III water body, and the water body is only slightly polluted. The operating process of the system is the process of online coagulation + submerged ultrafiltration. The submerged ultrafiltration membrane is a hollow fiber ultrafiltration membrane with a pore size of 0.01 micron and the material is PVDF ultrafiltration membrane. The operating flux is 1.5m / d. The set pressure difference of the whole system is 50KPa, that is, when the pressure difference of the ultrafiltration membrane is greater than 50KPa for 35s, the system will automatically perform general cleaning on the submerged ultrafiltration system, and then the system will continue to operate. If the time interval between two adjacent general cleanings is reduced to 25 minutes, the system will automatically perform chemical enhanced cleaning on the subm...

Embodiment 2

[0039] This test uses a certain surface raw water, its turbidity is about 40NTU, COD Mn Around 5mg / L, iron around 2mg / L. The quality of the raw water belongs to Class V water body, and the pollution is relatively serious. The operating process of the system is the process of online coagulation + submerged ultrafiltration. The submerged ultrafiltration membrane is a hollow fiber ultrafiltration membrane with a pore size of 0.01 micron and the material is PVDF ultrafiltration membrane. The operating flux is 1.3m / d. The set pressure difference of the whole system is 45KPa, that is, when the pressure difference of the ultrafiltration membrane is greater than 45KPa for 45s, the system will automatically perform general cleaning on the submerged ultrafiltration system, and then the system will continue to operate. If the time interval between two adjacent general cleanings is less than 20 minutes, the system will automatically perform chemical enhanced cleaning on the submerged u...

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Abstract

The invention discloses an automatic cleaning method of an immersion membrane filtration system. Including general cleaning and chemically enhanced cleaning, the method comprises: in the operation process of an immersion membrane filtration system, when the transmembrane pressure of an immersed membrane in the system is greater than a set transmembrane pressure for 30s-1min, conducting general cleaning to the system, with the set transmembrane pressure controlled at 30KPa-60KPa; after the general cleaning, leaving the system to continue operating, and when the time interval of two neighboring general cleaning is less than a set value, carrying out general cleaning to the system and then performing chemically enhanced cleaning, with the set value maintained at 10min-60min. The cleaning method of the invention can control membrane pollution timely, thus guaranteeing stable operation of the membrane system and avoiding the problem of too short service life of a membrane component due to excessive pollution of the membrane.

Description

technical field [0001] The invention belongs to the field of membrane water treatment, and in particular relates to a cleaning method for a submerged membrane filtration system. Background technique [0002] With the increasing development of water treatment membrane technology and the continuous decline of membrane cost, microfiltration / ultrafiltration membrane technology has made great progress in the field of water treatment, and its application range is also expanding. [0003] However, microfiltration or ultrafiltration membranes still face the problem of membrane fouling during operation. Membrane fouling leads to an increase in membrane operating pressure or a decrease in water production. Therefore, microfiltration or ultrafiltration systems require regular flushing or chemical cleaning to maintain ultrafiltration. Effective cleaning of the membrane is an important means to prolong the service life of the membrane. [0004] The conventional cleaning method commonly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D65/06C02F1/44
Inventor 邹高辉常春杨瑜芳
Owner TORAY FIBER RES INST(CHINA) CO LTD
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