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A system and method for online chemical cleaning of ceramic membranes

A technology of chemical cleaning and ceramic membrane, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of secondary pollution, ceramic membrane pollution, etc.

Active Publication Date: 2021-07-06
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of ceramic membrane pollution in the water treatment process and the need for system shutdown in the membrane cleaning process to affect the water production and the secondary pollution caused by cleaning agents, the present invention proposes an online chemical cleaning system and method for ceramic membranes to realize the ceramic membrane cleaning process. Fully automatic operation, no need to stop, no impact on production capacity, and no secondary pollution of cleaning agents

Method used

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  • A system and method for online chemical cleaning of ceramic membranes
  • A system and method for online chemical cleaning of ceramic membranes
  • A system and method for online chemical cleaning of ceramic membranes

Examples

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Effect test

example 1

[0049] The flat ceramic membrane is applied to the aerobic biological treatment of sewage biological treatment process. Membrane tank sludge concentration MLSS=15000mg / L, start the membrane tank suction system with a membrane filtration flux of 30LMH for constant flux and stable operation, when the transmembrane pressure difference (ΔTMP) increases to about -30kPa, start the online cleaning system . The results of many experiments show that after a certain amount of O 3 water or H 2 o 2 After online cleaning, the recovery rate of the transmembrane pressure difference of the ceramic flat membrane is not less than 95%. The specific effect is shown in Table 1 below.

[0050] Table 1 Test results of on-line cleaning of flat ceramic membranes

[0051] Test No. chemical cleaning agent ΔTMP before washing (kPa) After washing ΔTMP(kPa) TMP recovery rate (%) 1 h 2 o 2

[0052] During the test, the microbial activity was measured, and the results showed t...

example 2

[0054] The flat ceramic membrane is applied to the filtration treatment of the drinking water treatment process. Membrane tank sludge concentration MLSS=8000mg / L, start the membrane tank suction system with a membrane filtration flux of 80LMH for constant flux and stable operation, when the transmembrane pressure difference (ΔTMP) increases to about -30kPa, start the online cleaning system . The results of many experiments show that after a certain amount of O 3 water or H 2 o 2 After online cleaning, the recovery rate of the transmembrane pressure difference of the ceramic flat membrane is not less than 95%. The specific effect is shown in Table 2 below.

[0055] Table 2 Test results of on-line cleaning of flat ceramic membranes

[0056]

[0057]

[0058] The invention has the advantages of not affecting the water production capacity of the water treatment system, no secondary pollution, high cleaning efficiency, low cleaning cost, simple operation, strong feasibili...

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Abstract

The invention relates to a system and method for online chemical cleaning of ceramic membranes, which are used for online cleaning of ceramic membranes in water treatment systems. The system includes membrane pools, ceramic membranes, dosing pumps and suction pumps. The dosing pump Connected to the ceramic membrane located in the membrane tank through the pipeline to inject chemical cleaning agents into the ceramic membrane, the suction pump is connected to the ceramic membrane through the pipeline to discharge water from the ceramic membrane self-suction membrane for normal filtration At the same time, the residual chemical cleaning agent in the ceramic membrane is discharged into the membrane outlet pool. In the system and method, the membrane filtration and chemical cleaning processes are carried out simultaneously, which can be used to solve the problems of ceramic membrane pollution in the water treatment process, membrane cleaning process affecting system water production, and secondary pollution caused by cleaning agents.

Description

technical field [0001] The invention relates to a system and method for on-line chemical cleaning of ceramic membranes, which are suitable for (but not limited to) on-line cleaning of flat ceramic membrane pollution in water and sewage treatment (hereinafter referred to as water treatment) systems. Background technique [0002] With the development of economy and the advancement of science and technology, water treatment technology has developed rapidly. Among them, membrane technology has become one of the core technologies of water treatment process. In sewage treatment, membrane bioreactor (MBR) is more and more widely used as the most representative new water treatment technology. It combines biological treatment technology and membrane separation technology to replace the secondary sedimentation in the traditional process. The tank can efficiently separate solids and liquids, obtain stable reclaimed water for direct use, and maintain a high concentration of microbial b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02
CPCB01D65/02B01D2321/168
Inventor 张锡辉范小江刘楚
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV