Axial vibrating flat sheet membrane device capable of improving membrane flux and effectively controlling membrane pollution

A technology of axial vibration and flat membrane, applied in the direction of membrane, membrane technology, semi-permeable membrane separation, etc., can solve the problem that the microfiltration membrane or ultrafiltration membrane is easy to be polluted, so as to increase the cleaning frequency, improve the membrane flux, The effect of reducing breakage

Active Publication Date: 2016-06-29
TONGJI UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the difficult problem that the microfiltration membrane or ultrafiltration membrane is easily polluted during the application process, and provide an axial vibrating flat membrane device that can improve the membrane flux and effectively control the membrane fouling, so as to improve the membrane filtration efficiency And reduce the cleaning of the membrane and reduce the damage to the membrane, so as to save operating costs

Method used

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  • Axial vibrating flat sheet membrane device capable of improving membrane flux and effectively controlling membrane pollution
  • Axial vibrating flat sheet membrane device capable of improving membrane flux and effectively controlling membrane pollution
  • Axial vibrating flat sheet membrane device capable of improving membrane flux and effectively controlling membrane pollution

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Embodiment ２

[0024] Using the device described in Example 1, when the concentration of microalgae is 0.3g / L, a flat ultrafiltration membrane with a pore size of 0.1 micron is used to filter microalgae, and the membrane area is 0.02m 2 . Depend on image 3 It can be seen that at a certain fixed amplitude, as the frequency increases from 5 to 10 Hz, the critical flux of the membrane also increases; similarly, at a certain frequency, the critical flux increases from 5 to 20mm improve. Therefore, by increasing the frequency or amplitude (shear rate) the device can increase the critical flux.

Embodiment 3

[0026] Using the device described in Example 1, when the concentration of microalgae is 0.3g / L, a flat ultrafiltration membrane with a pore size of 0.1 micron is used to filter microalgae, and the membrane area is 0.02m 2 . Depend on Figure 4 It can be seen that when the amplitude is 1cm, the flux is 40L / m 2 In the case of h, the transmembrane pressure difference decreased significantly with the increase of frequency, indicating that the increase of frequency can effectively slow down membrane fouling. At 0Hz, the transmembrane pressure difference rose to 70kPa after filtration for only 2 hours; at 5Hz for 12 hours, the transmembrane pressure difference rose to 69kPa; and at 10Hz, after 24 hours of filtration, the transmembrane pressure difference The membrane pressure difference has only risen to 3.5kPa.

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Abstract

The invention relates to an axial vibrating flat sheet membrane device capable of improving membrane flux and effectively controlling membrane pollution. When the membrane technology is used for microalgae recycle or water treatment, membrane pollution is an inevitable problem all the time. Membrane pollution will reduce membrane flux and reduce the filtering efficiency, besides, cleaning of a membrane will consume more manpower and materials, the membrane is damaged, and the service life of the membrane is shortened. The axial vibrating flat membrane device quickly vibrates up and down to generate shear force on the surface of the membrane, deposition of pollutants on the surface of the membrane can be effective prevented, accordingly membrane pollution can be slowed down, and the membrane flux can be improved. According to the device, the vibration amplitude can be adjusted by punching in a rotary plate in turn, the rotary plate and a motor rotary shaft are connected, the rotary plate rotates along with the motor rotary shaft, and the vibration amplitude can be increased from 1 mm to 40 mm. A motor is connected with a frequency regulator, and the vibration frequency of a vibrating film can be adjusted by the frequency regulator. When the vibration amplitude is set to be 1-40 mm, the frequency of a vibrating device can be adjusted to be 0-60 Hz. According to the device, only a membrane assembly is driven to vibrate up and down, an aqueous solution in a reactor does not need to be driven, and accordingly energy consumption for vibration can be reduced.

Description

technical field [0001] The invention relates to an axially vibrating flat-plate membrane device capable of increasing membrane flux and effectively controlling membrane pollution, and belongs to the main fields of energy, water treatment, aquatic products, environmental treatment and restoration, and the like. Background technique [0002] Microfiltration and ultrafiltration technologies are being used more and more in water treatment and aquatic products. Although membrane technology has the advantages of high separation precision, good effluent quality, high treatment efficiency, stability and low energy consumption, problems such as easy fouling of the membrane limit the further popularization and use of membrane technology. Reducing membrane fouling can improve filtration efficiency, reduce membrane cleaning frequency, reduce membrane replacement frequency, and reduce the overall cost and operating cost of membrane filtration. Therefore, it will be a very meaningful thi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/08
CPCB01D63/08B01D63/082B01D2313/08B01D2315/04B01D2321/2058
Inventor 张亚雷褚华强周雪飞赵方超谭晓波郭隽任丽张文文
Owner TONGJI UNIV
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