CN107376652B - Equal-shearing vibration film device capable of stably controlling film pollution - Google Patents
Equal-shearing vibration film device capable of stably controlling film pollution Download PDFInfo
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- CN107376652B CN107376652B CN201710673851.6A CN201710673851A CN107376652B CN 107376652 B CN107376652 B CN 107376652B CN 201710673851 A CN201710673851 A CN 201710673851A CN 107376652 B CN107376652 B CN 107376652B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
- B01D63/08—Flat membrane modules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/20—By influencing the flow
- B01D2321/2033—By influencing the flow dynamically
- B01D2321/2058—By influencing the flow dynamically by vibration of the membrane, e.g. with an actuator
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Abstract
The invention relates to an equal-shear vibration film device capable of stably controlling film pollution. When membrane technology is used for the recovery of microalgae or water treatment, microbial cells, organic and inorganic particles and extracellular polymeric substances can cause severe contamination of the membrane and cause a drastic drop in membrane flux. Membrane fouling not only reduces the filtration efficiency of the membrane due to the reduced membrane flux, but frequent membrane cleaning also damages the membrane and reduces the membrane's life time, and additional cost investment is incurred. The equal shearing action generated on the membrane surface by the uniform speed rotary motion of the device can effectively and stably reduce the pollutants adhered on the membrane surface, thereby more effectively slowing down the membrane pollution. The device can realize the adjustment of the amplitude by changing the width of the crankshaft, the driving shaft drives the connecting plate to rotate, and the driven shaft drives the connecting plate to perform rotary motion. The motor is connected with a frequency regulator, and the vibration frequency can be regulated by a frequency regulator. The device can provide stable equal shearing action and can better improve the pollution resistance of the membrane.
Description
Technical Field
The invention relates to an equal-shearing vibrating membrane device capable of stably controlling membrane pollution, and belongs to the main fields of water treatment, aquatic products, environmental management and restoration and the like.
Background
More and more microfiltration and ultrafiltration techniques are used in water treatment, aquaculture, etc. Although the membrane technology has many advantages of high separation precision, good effluent quality, high treatment efficiency, low stability and energy consumption, the problem of easy pollution of the filter membrane limits the further popularization of the membrane technology. The anti-pollution capacity of the membrane is improved, so that the filtering efficiency can be improved, the cleaning frequency of the membrane is reduced, and the replacement frequency of the membrane is reduced, so that the overall cost and the operation cost of the membrane filter are reduced. Therefore, it is a very necessary and meaningful matter to improve the anti-fouling performance of the membrane in filtration. By the vibration of the membrane, that is, using the vibration membrane is very effective for improving the anti-contamination capability of the membrane. The shear rate generated by the existing diaphragm is not uniform, and the generated shear rate gradually increases from zero to a maximum value and then gradually decreases to zero, and the process is repeated. This will reduce the membrane's resistance to fouling and the stability of the membrane filtration. Therefore, it would be necessary to have a diaphragm that can always maintain filtration at the maximum shear rate.
Disclosure of Invention
The invention aims to provide an equal-shearing vibrating membrane device capable of stably controlling membrane pollution, so as to solve the problem of uneven shearing rate generated in the application process of a vibrating membrane and further improve the membrane filtration efficiency and the anti-pollution performance of the membrane.
The invention relates to an equal-shear vibration film device capable of stably controlling film pollution, which comprises the following steps: the amplitude and the frequency of the vibration device can be adjusted, and the pollution of the membrane can be effectively and stably reduced by controlling the membrane assembly to do constant-speed rotary motion. The device does not need to drive the water solution in the reactor, and only needs to drive the membrane component 8 to do constant-speed rotary motion.
The invention provides an equal-shear vibration membrane device capable of stably controlling membrane pollution, which consists of a frequency modulator 1, a motor 2, a driving shaft 3, a filter tank 4, a supporting plate 5, a driven shaft 6, a connecting rod 7, a flat membrane component 8, a membrane water outlet 9, a connecting plate 10, a driven crankshaft 11 and a main crankshaft 12; wherein: there are 1 main crankshaft 12 and 2 slave crankshafts 11; one end of the main crankshaft 12 is connected with the driving shaft 3, and the other end is connected with the connecting plate 10; one end of the driven shaft 11 is connected with the driven shaft 6, and the other end of the driven shaft is connected with the connecting plate 10; the support plates 5 are placed on two sides of the top of the filter tank 4, one end of the driving shaft 3 penetrates through the support plates 5 and is connected with the motor 2, the bottom of the connecting plate 10 is connected with the flat membrane component 8 through the connecting rod 7, and one side of the flat membrane component 8 is provided with a membrane water outlet 9; the motor 2 is connected with the frequency modulator 1, and the driving shaft 3 rotates along with the motor 2 so as to drive the connecting plate 10 to rotate; the connecting plate 10 rotates in a constant speed due to the action of the secondary crankshaft 11; the movement modes of the flat membrane component 8 and the connecting plate 10 are the same, and the flat membrane component also performs constant-speed rotary motion, and the constant-speed rotary motion of the flat membrane component greatly reduces the membrane pollution rate during the filtration of the membrane.
In the invention, the vibration frequency of the flat membrane component 8 can be freely adjusted by controlling the frequency modulator 1, so that the vibration frequency of the device can be adjusted according to requirements.
In the invention, the flat membrane assemblies 8 are fixed on the connecting rods 7, the number of the flat membrane assemblies 8 is 1-100, the flat membrane assemblies are arranged according to the realization requirement so as to improve the filtration efficiency and reduce the occupied area, and the distance between every two adjacent flat membrane assemblies 8 is not less than 0.1 cm.
In the invention, the other end of the water outlet pipe opening 9 is connected with the water pipe, water is discharged through the water pipe, and the membrane pollution rate is greatly reduced due to the constant-speed rotary motion of the membrane in the filtration process, so that the water flux of the membrane is improved, and the filtration efficiency can be improved.
In the invention, the amplitude of the device can be adjusted by changing the width of the crankshaft, and the amplitude can be adjusted from 0.1cm to 10cm as required by changing the widths of the main crankshaft 12 and the auxiliary crankshaft 11.
The invention has the beneficial effects that:
1. in the filtering process, the device can slow down membrane pollution through constant-speed rotary motion, thereby reducing the cleaning frequency of the membrane.
2. In the filtering process, the filtering efficiency is reduced due to small membrane flux, the membrane pollution is easily caused due to large flux, and the device can effectively prevent pollutants from depositing on the membrane surface by generating a shearing action through constant-speed rotary motion, so that the membrane flux is improved.
3. The device can keep the maximum shear rate all the time during working, thereby obviously improving the pollution resistance and the filtration stability of the membrane.
4. When the device works, only the membrane component is driven to do constant-speed rotary motion, and the water solution in the reactor is not driven, so that the working energy consumption can be reduced.
5. Along with the increase of the amplitude or the frequency, the device can improve the retention rate of organic matters in the membrane effluent, thereby reducing the treatment cost in the subsequent water treatment.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial cross-sectional view;
FIG. 3 is a graph showing the change in transmembrane pressure difference during filtration at different frequencies;
FIG. 4 is a comparison of equal shear diaphragm versus linear diaphragm filtration;
reference numbers in the figures: 1 is a frequency modulator; 2 is a motor; 3 is a driving shaft; 4 is a filter tank; 5 is a supporting plate; 6 is a driven shaft; 7 is a connecting rod; 8 is a flat membrane component; 9 is a membrane water outlet; 10 is a connecting plate; 11 is the slave crankshaft; and 12 is a main crankshaft.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Example 1: the amplitude of the device can be adjusted by changing the width of the crankshaft, and the amplitude can be adjusted from 0.1cm to 10cm according to requirements. The crankshaft is divided into a main crankshaft 12 and a secondary crankshaft 11, which are completely identical, and the difference lies in that: one end of the main crankshaft 12 is connected with the driving shaft 3, and the other end is connected with the connecting plate 10; one end of the crankshaft 11 is connected to the driven shaft 6, and the other end is connected to the connecting plate 10. The device comprises a main crankshaft 12 and two auxiliary crankshafts 11.
The amplitude of the vibration device can be adjusted, and the amplitude can be increased from 0.1cm to 10 cm. The adjustment of the amplitude is achieved by adjusting the width (a, fig. 2) of the slave 11 and master 12 crankshafts. The driving shaft 3 is connected with the motor 2 and rotates along with the motor, the main crankshaft 12 is connected with the driving shaft 3, the main crankshaft 12 is connected with the connecting plate 10, and the driven shaft 6 and the driven crankshaft 11 can ensure that the connecting plate 10 can perform constant-speed rotary motion. The flat membrane component 8 is fixed on the connecting rod 7, and the connecting rod 7 is fixed below the connecting plate 10, so that the flat membrane component 8 can realize constant-speed rotary motion, and membrane pollution is reduced. The flat membrane assemblies 8 are fixed on the connecting rod 7, 1 to dozens of flat membrane assemblies 8 can be installed in parallel to improve the filtering efficiency, and the distance between every two flat membrane assemblies 8 can be controlled to be 0.1-1 cm. The motor 2 is connected with the frequency regulator 1 to realize the regulation of the vibration frequency. The support plate 5 is fixed on the filter tank 4 and is used for supporting the operation of the whole filter system.
The solution to be filtered is injected into the filtration tank 4, completely submerging the flat membrane module 8. The vibration frequency can also be adjusted by the frequency regulator 1 before or during operation by adjusting the crankshaft width to select the appropriate amplitude before the start of the filtration. In the filtration, if a plurality of flat membrane modules 8 are used for filtration at the same time, the plurality of flat membrane modules 8 can be operated in parallel, and water outlet is realized by pumping of a pump. The membrane is first activated before filtration to reduce membrane fouling. A vacuum gauge is installed between the flat membrane module 8 and the pump, and the pollution condition of the membrane is characterized by transmembrane pressure difference. When the transmembrane pressure difference is high, the membrane is seriously polluted and needs to be cleaned. When the membrane is cleaned, the polluted membrane module is taken out for physical or chemical cleaning. Finally, the cleaned membrane or a new membrane is fixed on the connecting rod again.
Example 2
Using the apparatus described in example 1, the concentration of Chlorella was 0.5 g/L, and the microalgae were filtered using a flat ultrafiltration membrane with a pore size of 0.1 μm and a membrane area of 0.02 m2. As can be seen from FIG. 3, at an amplitude of 2 cm, the operating flux was 30L/m2h, the 5 Hz transmembrane pressure difference gradually decreases with the increase of the frequency from 1. The shear rate of the membrane surface is increased along with the increase of the frequency, so that the algae cells can be more effectively prevented from approaching the membrane surface, and the membrane pollution is reduced. It can be seen from this experiment that the membrane fouling was significantly reduced with the iso-shear diaphragm when the vibration frequency was increased by only 2 Hz, and the membrane fouling was stably controlled with the iso-shear diaphragm when the frequency was only 5 Hz.
Example 3
Using the apparatus described in example 1, the concentration of Chlorella was 0.5 g/L, and the microalgae were filtered using a flat ultrafiltration membrane with a pore size of 0.1 μm and a membrane area of 0.02 m2. At an amplitude of 2 cm, a flux of 30L/m2And h, carrying out a comparison experiment of filtering the microalgae on the equal-shearing vibration membrane and the axial vibration membrane. The filtration experiments were carried out for 12 hours, and the change curve of the transmembrane pressure difference is shown in FIG. 4. The transmembrane pressure difference increment of the equal-shear vibrating membrane in the whole experiment process is only 0.8 kPa, and the transmembrane pressure difference increment of the axial vibrating membraneThe pressure was 4.5 kPa. The transmembrane pressure increment of the equal-shear vibration membrane in a 12-hour filtration experiment is lower than that of the axial vibration membrane, which shows that the anti-pollution capability of the equal-shear vibration membrane is better than that of the axial vibration membrane.
Claims (5)
1. An equal-shear vibration membrane device capable of stably controlling membrane pollution comprises a frequency modulator (1), a motor (2), a driving shaft (3), a filter tank (4), a supporting plate (5), a driven shaft (6), a connecting rod (7), a flat membrane component (8), a membrane water outlet (9), a connecting plate (10), a driven crankshaft (11) and a main crankshaft (12); the method is characterized in that: the number of the main crankshafts (12) is 1, and the number of the auxiliary crankshafts (11) is 2; one end of the main crankshaft (12) is connected with the driving shaft (3), and the other end is connected with the connecting plate (10); one end of the driven shaft (11) is connected with the driven shaft (6), and the other end of the driven shaft is connected with the connecting plate (10); the support plates (5) are placed on two sides of the top of the filter tank (4), one end of the driving shaft (3) penetrates through the support plates (5) and is connected with the motor (2), the bottom of the connecting plate (10) is connected with the flat membrane component (8) through the connecting rod (7), and one side of the flat membrane component (8) is provided with a membrane water outlet (9); the motor (2) is connected with the frequency modulator (1), and the driving shaft (3) rotates along with the motor (2) so as to drive the connecting plate (10) to rotate; the connecting plate (10) rotates in a constant speed circle under the action of the secondary crankshaft (11); the movement modes of the flat membrane component (8) and the connecting plate (10) are consistent and are also constant-speed rotary movement, and the membrane greatly reduces the membrane pollution rate during filtration just because of the constant-speed rotary movement of the flat membrane component.
2. The iso-shear diaphragm device capable of stably controlling the membrane fouling according to claim 1, wherein: by controlling the frequency modulator (1), the vibration frequency of the flat-plate membrane component (8) can be freely adjusted, and the vibration frequency of the device can be adjusted according to requirements.
3. The iso-shear diaphragm device capable of stably controlling the membrane fouling according to claim 1, wherein: the flat membrane assemblies (8) are fixed on the connecting rod (7), the number of the flat membrane assemblies (8) is 1-100, the flat membrane assemblies are arranged according to implementation requirements to improve the filtering efficiency and reduce the occupied area, and the distance between every two adjacent flat membrane assemblies (8) is not less than 0.1 cm.
4. The iso-shear diaphragm device capable of stably controlling the membrane fouling according to claim 1, wherein: the other end of the water outlet pipe (9) is connected with a water pipe, water is discharged through the water pipe, and the membrane pollution rate is greatly reduced due to the constant-speed rotary motion of the membrane in the filtration process, so that the water flux of the membrane is improved, and the filtration efficiency can be improved.
5. The iso-shear diaphragm device capable of stably controlling the membrane fouling according to claim 1, wherein: the amplitude of the device can be adjusted by changing the width of the crankshaft, and the amplitude can be adjusted from 0.1cm to 10cm as required by changing the widths of the main crankshaft (12) and the auxiliary crankshaft (11).
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| CN108380046A (en) * | 2018-03-07 | 2018-08-10 | 同济大学 | A kind of dynamic film sewage treatment system for the processing of lavatory fecaluria |
| CN108905634A (en) * | 2018-08-21 | 2018-11-30 | 华南理工大学 | A method of improving polluted membrane cleaning effect using shearing force |
| CN109293086B (en) * | 2018-10-17 | 2021-08-24 | 倍杰特集团股份有限公司 | High-frequency concentrated water treatment system for quality-divided salt |
| CN113019129B (en) * | 2021-02-26 | 2022-08-19 | 碧水源膜技术研究中心(北京)有限公司 | Energy-saving vibration group system |
| CN113926682B (en) * | 2021-10-13 | 2022-09-23 | 袁晓恳 | High-strength extremely-low-frequency sound generator |
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| JPH0857270A (en) * | 1994-08-25 | 1996-03-05 | Hitachi Metals Ltd | Membrane filter apparatus |
| US6544424B1 (en) * | 1999-12-03 | 2003-04-08 | Refined Technology Company | Fluid filtration system |
| JP4096623B2 (en) * | 2002-05-22 | 2008-06-04 | 株式会社日立ハイテクノロジーズ | Filtration device |
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| CN203112587U (en) * | 2013-03-27 | 2013-08-07 | 三达膜科技（厦门）有限公司 | Water treatment device of rotary flat membrane bioreactor |
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