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Method for prolonging cleaning period of immersed ultra filtration membrane

A cleaning cycle and ultrafiltration membrane technology, applied in ultrafiltration, chemical instruments and methods, membrane technology, etc., can solve the problems of short cleaning cycle, insufficient cleaning, and high degree of membrane fouling, improve water production rate and reduce membrane pollution. Contamination, the effect of prolonging the cleaning cycle

Inactive Publication Date: 2012-11-14
北京建筑工程学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method has problems such as insufficient cleaning, high degree of membrane fouling, and short cleaning cycle.

Method used

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  • Method for prolonging cleaning period of immersed ultra filtration membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The submerged ultrafiltration membrane filters the effluent of a sedimentation tank of a water plant, and the turbidity of the membrane tank influent is 2.87-3.24NTU, COD Mn The content is 2.89-3.04mg·L -1 , the water temperature is 15.5-16.8°C, and the membrane flux is 25L m -2 h -1 . No destabilizer is added to the water, the reflux ratio is 10%, and the aeration intensity is 45m 3 m -2 h -1 , the aeration time is 3min, the aeration interval time is 30min, the ultrasonic and aeration are carried out simultaneously, the ultrasonic power consumption is 40kHz, and the sound intensity is 50W·m -2 . After the membrane runs for 150 hours, the flux drops to 10L m -2 h -1 , down 60%. At this time, stop the filtration, and clean and discharge the membrane.

Embodiment 2

[0038] The submerged ultrafiltration membrane filters the effluent of a sedimentation tank of a water plant, and the turbidity of the membrane tank influent is 2.79-3.12NTU, COD Mn The content is 2.91-3.14mg·L -1 , the water temperature is 14.5-17.2°C, and the membrane flux is 25L m -2 h -1 . No destabilizer is added to the water, the reflux ratio is 10%, and the aeration intensity is 45m 3 m -2 h -1 , the aeration time is 3min, the aeration interval time is 30min, and the ultrasonic wave is not used. After the membrane runs for 90 hours, the flux drops to 10L m -2 h -1, down 60%. At this time, stop the filtration, and clean and discharge the membrane.

Embodiment 3

[0040] The submerged ultrafiltration membrane filters the effluent of a sedimentation tank in a water plant, and the turbidity of the influent water in the membrane tank is 2.85-3.37NTU, COD Mn The content is 2.69-2.97mg·L -1 , the water temperature is 16.5-17.2°C, and the membrane flux is 30L m -2 h -1 . No destabilizing agent is added to the water, the reflux ratio is 10%, no aeration is used, the ultrasonic power consumption is 40kHz, and the sound intensity is 50W·m -2 , Ultrasound interval time is 30min. After the membrane runs for 60 hours, the flux drops to 15L m -2 h -1 , down 50%. At this time, stop the filtration, and clean and discharge the membrane.

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Abstract

The invention relates to a method for prolonging the cleaning period of an immersed ultra filtration membrane, which comprises the coupling of stock solution pretreatment, cross flow, air vibration, low-power consumption ultrasonic cleaning and other methods. The method can be realized through one of the four methods or randomly combining the methods. The stock solution pretreatment method comprises pre-filtering, destabilization agent adding or the combined use of the pre-filtering and the destabilization agent adding; the cross flow method has the ratio of backflow rate to ultra filtration membrane inflow rate is (5:100)-(30:100); the air vibration method has the aeration intensity of 10-100m<3>m<minus 2>h<minus 1>, the aeration time of 1-5 minutes and the aeration interval time of 20-180 minutes; and the low-power consumption ultrasonic cleaning method has the ultrasonic power of 10-50kHz, the ultrasonic sound intensity of 10-80Wm<minus 2>, the ultrasonic duration of 1-5 minutes and the ultrasonic interval time of 20-180 minutes.

Description

technical field [0001] The invention relates to a method for prolonging the cleaning cycle of a submerged ultrafiltration membrane, in particular to a method for prolonging the cleaning cycle of a submerged ultrafiltration membrane used in drinking water treatment. Background technique [0002] Membrane separation method represented by polymer separation membrane, as a new type of fluid separation unit operation method, is a separation method widely used in chemical engineering, food, water treatment and other engineering fields. Among them, membrane fouling is an important factor limiting the large-scale application of membrane methods. In water treatment projects, due to the complex components and different properties of pollutants in water sources, it is more likely to cause membrane fouling and affect the long-term stable operation of membrane units in the project. [0003] Membrane fouling refers to the phenomenon that certain components in the feed liquid deposit on t...

Claims

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Application Information

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IPC IPC(8): B01D65/02B01D61/14B01D61/20
Inventor 孙丽华张雅君何寿平张国宇许萍
Owner 北京建筑工程学院
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