CN114917760A - Micro-nano air-flotation filtering structure and micro-nano air-flotation filtering device - Google Patents

Abstract

The invention provides a micro-nano air-flotation filtering structure and a micro-nano air-flotation filtering device, wherein the micro-nano air-flotation filtering structure comprises an accommodating cavity, a rotary driving unit and a membrane filtering unit, the membrane filtering unit is arranged in the accommodating cavity, the rotary driving unit is arranged outside the accommodating cavity, the rotary driving unit drives the membrane filtering unit to rotate, the membrane filtering unit comprises a hollow rotating shaft and a filtering membrane, a seepage channel is arranged in the hollow rotating shaft, the filtering membrane is arranged on the hollow rotating shaft, a water production channel is arranged in the filtering membrane, the water production channel is communicated with the seepage channel, an air-flotation aeration unit is arranged in the accommodating cavity, the air-flotation aeration unit is arranged below the filtering membrane, and micro-nano bubbles can be discharged by the air-flotation aeration unit; the micro-nano air-flotation filtering device comprises the micro-nano air-flotation filtering structure. The invention can reduce the sediment on the surface of the membrane and improve the filtration efficiency and stability.

Description

Micro-nano air-flotation filtering structure and micro-nano air-flotation filtering device

Technical Field

The invention relates to the technical field of membrane filtration, in particular to a micro-nano air-flotation filtering structure and a micro-nano air-flotation filtering device.

Background

The cross flow filters to the tangent "cross flow of a kind of with filtration membrane" form of liquid flow, because its high surface cross flow, the shearing force on membrane surface has been improved, there is certain scouring action to membrane surface, can make the filtration process work under the condition of accumulating a small amount of filter cakes all the time, concentration polarization and membrane pollution in the membrane separation process have been improved to a certain extent, but increase along with the filtration time, receive the influence of factors such as liquid reflux resistance, the tangential velocity of flow that the fluid produced membrane surface, the sedimentary deposit that lacks filtration membrane surface is washed out completely along with the time lapse. With the deepening of relevant theories and experimental researches of a membrane separation mode, a cross flow filtration mode is optimized to obtain dynamic cross flow filtration, and the centrifugal force and the shearing force generated by fluid rotation and the turbulence effect of a feed liquid are utilized to enable the feed liquid to generate higher tangential flow velocity on the surface of a membrane, so that the growth of a filter cake layer is inhibited, the pollution on the surface of the membrane can be more effectively eliminated, the concentration polarization is reduced, and the filtration stability of the membrane system is improved.

However, in some fields such as bio-pharmaceuticals, novel nano-material preparation, sewage treatment and the like, the conditions of high material viscosity, high impurity content, high solid content and the like exist, so that the membrane filtration device can easily reach a pollution level in a short time, and the phenomena of reduced filtration efficiency, poor filtration stability, low concentration and the like are caused.

In the prior art, a rotary ceramic membrane filter device is generally implemented by using a regular disc membrane, and the membrane is fixed on a hollow rotating shaft. The mode is convenient for mechanical fixation and installation of the circular membrane, but can lead to the material liquid to tend to be orderly in the flow field so as to gradually deposit particles on the surface of the membrane, and further lead to the reduction of the anti-pollution capacity of the membrane in the separation process, thereby limiting the application field of the rotary membrane filtration system.

Disclosure of Invention

The invention aims to provide a micro-nano air-flotation filtering structure which can reduce the sediment on the surface of a membrane and improve the filtering efficiency and stability.

The second purpose of the present invention is to provide a micro-nano air-floating filter device comprising the above micro-nano air-floating filter structure.

In order to achieve the first purpose, the micro-nano air-flotation filtering structure provided by the invention comprises a containing cavity, a rotary driving unit and a membrane filtering unit, wherein the membrane filtering unit is arranged in the containing cavity, the rotary driving unit is arranged outside the containing cavity, the rotary driving unit drives the membrane filtering unit to rotate, the membrane filtering unit comprises a hollow rotating shaft and a filtering membrane, a seepage channel is arranged in the hollow rotating shaft, the filtering membrane is arranged on the hollow rotating shaft, a water production channel is arranged in the filtering membrane, the water production channel is communicated with the seepage channel, the containing cavity is also provided with an air-flotation aeration unit, the air-flotation aeration unit is arranged below the filtering membrane, and micro-nano bubbles can be discharged by the air-flotation aeration unit.

According to the scheme, when the rotary driving unit drives the membrane filtering unit to rotate, fluid in the containing cavity can generate disordered turbulence, a large amount of micro-nano bubbles are discharged through the air floatation aeration unit, and under the coordination action of rotary centrifugal force and shearing force, the micro-nano bubbles can explode and form eddy current, so that the disorder degree of the turbulence can be enhanced, the deposition of particles on the surface of the filtering membrane can be effectively reduced, the pollution to the surface of the filtering membrane is delayed, the membrane filtering device can be further more suitable for material environments with high concentration, high solid content and high viscosity special effects, and the separation and filtration efficiency and performance of the rotary membrane are greatly improved; the micro-nano bubbles are adhered to pollutants or particulate matters in the fluid in the rising process, so that the buoyancy of the pollutants or the particulate matters is larger than the gravity and the floating resistance, and the pollutants or the particulate matters float, thereby being beneficial to reducing the deposition of the pollutants or the particulate matters on the surface of the filtering membrane, playing a role in sweeping the surface of the filtering membrane, weakening concentration polarization and reducing membrane pollution.

The further proposal is that the air-floating aeration unit is an air-floating membrane which is arranged on the hollow rotating shaft and is positioned right below the filtering membrane, and the air-floating membrane can rotate along with the hollow rotating shaft.

It is seen by above-mentioned scheme that through setting up the air supporting membrane on the cavity rotation axis, when the rotation of cavity rotation axis, air supporting membrane and filtration membrane synchronous revolution, both are in relative quiescent condition for the bubble that the air supporting membrane launched can act on filtration membrane on the surface, is favorable to reducing filtration membrane surface pollution.

The further proposal is that the air floating membrane is provided with a first air inlet channel and a plurality of air outlet micropores, and the first air inlet channel is respectively communicated with the plurality of air outlet micropores; a second air inlet channel is further arranged in the hollow rotating shaft and communicated with the first air inlet channel.

According to the scheme, the second air inlet channel is arranged in the hollow rotating shaft and used for ventilating the inside of the air floatation membrane, so that the air floatation membrane can rotate and discharge micro-nano bubbles outwards.

The further proposal is that a cross flow channel is formed between the filtering membrane and the air floating membrane and is communicated with the accommodating cavity.

According to the scheme, the cross flow channel is arranged, so that on one hand, fluid can conveniently filter from the cross flow channel to enter the filtering membrane, and on the other hand, micro-nano bubbles can conveniently act on the fluid in the cross flow channel and sweep the surface of the filtering membrane.

The further scheme is that the filtering membranes are provided with a plurality of air floating membranes, the air floating membranes and the filtering membranes are arranged at intervals up and down, and the air floating membranes are arranged in parallel with the filtering membranes.

According to the scheme, the multiple filtering membranes and the multiple air floatation membranes are arranged at intervals, so that at least one air floatation membrane is arranged below each filtering membrane, and each filtering membrane can be influenced by micro-nano bubbles discharged by the air floatation membrane.

The further scheme is that the filtering membrane and the air floating membrane are detachably connected with the hollow rotating shaft, the installation positions of the filtering membrane and the air floating membrane can be exchanged, and after the positions of the filtering membrane and the air floating membrane are exchanged, the second air inlet channel is communicated with the water production channel of the filtering membrane.

According to the scheme, the filtering membrane can be installed in a position exchange mode with the air floatation membrane when needed, the filtering membrane is intensively cleaned by utilizing gas, online active cleaning is achieved, further reduction of pollutants on the surface of the filtering membrane is facilitated, and continuity and stability of system operation are guaranteed.

The further scheme is that the air floatation aeration unit is arranged on the bottom wall of the accommodating cavity, and the hollow rotating shaft can rotate relative to the air floatation aeration unit.

By above-mentioned scheme, through setting up the air supporting aeration unit at the diapire that holds the chamber, the micro-nano bubble of air supporting aeration unit can act on all filtration membranes above that, is favorable to saving the effect of air supporting aeration unit.

In order to achieve the second purpose, the micro-nano air-flotation filtering device provided by the invention comprises an installation support, a separation tank and the micro-nano air-flotation filtering structure, wherein the separation tank is arranged on the installation support, a membrane filtering unit and an air-flotation aeration unit of the micro-nano air-flotation filtering structure are both arranged in the separation tank, and a rotation driving unit of the micro-nano air-flotation filtering structure is arranged outside the separation tank.

The further proposal is that one end of a hollow rotating shaft of the membrane filtration unit penetrates out of the separation tank, a penetrating fluid outlet is arranged at one end of the hollow rotating shaft penetrating out of the separation tank in a communicating way, and the penetrating fluid outlet is communicated with a penetrating fluid channel of the hollow rotating shaft.

The further scheme is that a liquid inlet pipe and a sewage draining pipe are arranged at the lower part of the separating tank, a liquid discharging pipe is arranged at the upper part of the separating tank, and pressure detectors are arranged at the upper parts of the liquid inlet pipe, the sewage draining pipe and the separating tank.

Drawings

Fig. 1 is a structural diagram of an embodiment of the micro-nano air flotation filtering device.

Fig. 2 is a structural diagram of a micro-nano air-flotation filtering structure in an embodiment of the micro-nano air-flotation filtering device of the invention.

FIG. 3 is a cross-sectional view of a membrane filtration unit and an air flotation aeration unit in an embodiment of the micro-nano air flotation filtration device.

The invention is further explained with reference to the drawings and the embodiments.

Detailed Description

Referring to fig. 1 to 3, the micro-nano air-flotation filtering device provided in this embodiment includes a mounting bracket 1, a separation tank 2 and a micro-nano air-flotation filtering structure, the separation tank 2 is disposed on the mounting bracket 1, and an accommodating cavity is provided in the separation tank 2. Micro-nano air supporting filtration includes rotary drive unit 3, membrane filter unit 4 and air supporting aeration unit, and membrane filter unit 4 and air supporting aeration unit all set up the intracavity that holds at knockout drum 2, and rotary drive unit 3 sets up in the lower part outside of knockout drum 2 and sets up on installing support 1, and rotary drive unit 3 can drive membrane filter unit 4 rotatory. Membrane filtration unit 4 can make the fluid that holds the intracavity produce unordered torrent at rotatory in-process, and the air supporting aeration unit can discharge a large amount of micro-nano bubbles to increase the unordered degree of unordered torrent, play the effect that increases fluid flow and torrent disturbance.

The membrane filtration unit 4 includes a hollow rotating shaft 41 and a plurality of filtration membranes 42. The upper part of the hollow rotating shaft 41 is arranged in the separation tank 2, the lower part of the hollow rotating shaft 41 penetrates out of the separation tank 2, and the hollow rotating shaft 41 and the separation tank 2 are hermetically connected through a mechanical sealing assembly, which is a standard fitting in the field and is not described herein again. The rotation driving unit 3 includes a driving motor, preferably an asynchronous motor, and a speed reducer, to which a driving shaft of the driving motor is connected, the speed reducer being a parallel shaft type speed reducer, and the speed reducer being connected to a lower portion of the hollow rotating shaft 41 through a hollow shaft locking device. A seepage passage 411 is arranged in the hollow rotating shaft 41, the seepage passage 411 extends along the axial direction of the hollow rotating shaft 41, a seepage liquid outlet 412 is arranged at one end of the seepage passage 411, which penetrates out of the separation tank 2, and the seepage liquid outlet is communicated with the seepage passage 411.

The filtering membranes 42 are divided into two or three groups with equal number, each group is uniformly arranged on the hollow rotating shaft 41 at intervals, in this embodiment, two or three filtering membranes 42 are arranged, the extending direction of the filtering membranes 42 is perpendicular to the axial direction of the hollow rotating shaft 41, a preset distance is arranged between two adjacent filtering membranes 42 in the same group, and the filtering membranes 42 are fixed by the laminating plate 43. The filtering membrane 42 on the uppermost layer is fastened through the upper limiting piece 44, and the filtering membrane 42, the upper limiting piece 44 and the laminating plate 43 are arranged in a sealing mode. All the filtering membranes 42 are arranged in parallel, a water production channel 421 is arranged in each filtering membrane 42, a plurality of filtering holes are formed in the surface of each filtering membrane 42, and the filtering holes are communicated with the seepage channel 411 through the water production channels 421. The membrane filtering unit 4 and the hollow rotating shaft 41 are driven by the rotary driving unit 3 to rotate, so that a disordered turbulence phenomenon inconsistent with the filtering direction can be formed, the deposition of particles on the surface of the membrane can be avoided, and the membrane pollution is reduced.

The filtering membrane 42 is a disc structure or a disc structure, and the disc filtering membrane 42 has the advantages of stable structure, high rotation speed and good separation effect. The filter membrane 42 is mainly A1 ₂ O ₃ 、ZrO ₂ 、Ti0 ₂ And Si0 ₂ The porous membrane prepared by the inorganic materials has the pore diameter of 0.01-50 μm, and can adapt to the operation environment with higher rotating speed of 300-1000RPM and the like. The filtration membrane 42 may be a hollow ceramic membrane, a PVDF membrane, a metal membrane, or a flexible sheet membrane, wherein the metal membrane and the flexible sheet membrane are suitable for use in a lower rotational speed operating environment. PVDF membrane, polyvinylidene difluoride membrane, is a solid support commonly used in western blotting. The film is preferably a commercially available IPUF film.

The air flotation aeration unit is arranged below the filtering membrane 42 and can discharge a large amount of micro-nano bubbles. The minute bubbles present in the liquid are referred to as microbubbles when the diameter of the bubbles is 100 μm or less, and the bubbles having a diameter of 100nm or less are referred to as nanobubbles. The micro-nano bubbles refer to bubbles with diameters ranging from tens of micrometers to hundreds of nanometers when the bubbles occur, are between micro bubbles and nano bubbles, and have physical and chemical properties, such as an air floatation function, which are not possessed by conventional bubbles. The air flotation function is that air bubbles are introduced into liquid mixed with other phases or particles, and the air bubbles have adsorbability due to the fact that the air bubbles have negative charges, so that the air bubbles are adsorbed on the surfaces of the other phases or particles by the fact that the other phases or particles in the fluid have positive charges and the negative charges are attracted in the process of concentrating and separating the fluid, and accordingly the buoyancy of the other phases or particles in the liquid is increased, the other phases or particles float on the surface of the liquid, and the purpose of separating the liquid from the liquid is achieved. Therefore, the better the adsorption performance of the bubbles, the better the air flotation effect, and the adsorption performance of the bubbles depends on the diameter of the bubbles. The smaller the diameter of the bubble, the higher the potential at the surface, and therefore the bubble is more likely to adsorb to the surface of another phase in the liquid and separate from the liquid.

In one embodiment, the air flotation aeration unit is provided with an air flotation membrane 5, the number of the air flotation membranes 5 is provided with a plurality of air flotation membranes 5, the air flotation membranes 5 are arranged on the hollow rotating shaft 41, the air flotation membranes 5 are arranged in parallel and at intervals with the filtering membrane 42, the air flotation membranes 5 are arranged below the filtering membrane 42, and the air flotation membrane 5 positioned at the lowest position is fastened through the lower stopper 45. When the hollow rotating shaft 41 drives the filtering membrane 42 to rotate, the air floatation membrane 5 rotates synchronously, and micro-nano bubbles are uniformly dispersed to the inside of the separating tank 2, so that the vortex effect of the blasting of the micro-nano bubbles is fully exerted, and the flowing disorder degree of fluid is increased. The air floating membrane 5 is communicatively provided with a first air inlet passage 51 and a plurality of air outlet micro-holes. In this embodiment, the aperture of the micropore of giving vent to anger is the nanometer, and the bubble that its produced is the nanobubble respectively, and the nanobubble has the characteristic of above-mentioned micro-nano bubble, has more efficient filtration separation efficiency, more can adapt to high viscosity, high solid content material separation scene.

Correspondingly, a second air inlet channel 413 is further arranged in the hollow rotating shaft 41, the second air inlet channel 413 extends along the axial direction of the hollow rotating shaft 41, the second air inlet channel 413 is communicated with the first air inlet channel 51, the second air inlet channel 413 is communicated with an air supply device outside the separation tank 2 through an air pipe 7, and the air pipe 7 preferably penetrates upwards through the upper cover 22 of the separation tank 2. Compressed gas is blown into the air flotation membrane 5 through an external air supply device, so that a large amount of micro-nano bubbles are discharged from the air flotation membrane 5 into the accommodating cavity.

A cross flow channel 6 for flowing of fluid is arranged between the filtering membrane 42 and the adjacent air floating membrane 5, the cross flow channel 6 is communicated with the accommodating cavity, when the filtering membrane rotates, air floating disturbance and bubble blasting of the air floating membrane 5 form vortex, a disordered turbulence phenomenon inconsistent with the filtering direction can be formed, and the fluid is acted by forces in different directions in the cross flow channel 6 to form disordered turbulence which is more disordered, so that the surface of the filtering membrane 42 can be effectively swept, concentration polarization is weakened, and membrane pollution is reduced. The air-floating membrane 5 is arranged, local vortex is formed by cloud air-floating, the turbulence on the surface of the membrane is strengthened, the deposition phenomenon of particles on the surface of the filtering membrane 42 is effectively avoided, membrane pollution is reduced to a great extent, continuity and stability can be kept, and the air-floating membrane is more suitable for filtering and separating a high-viscosity and high-solid-content material system.

In this embodiment, one air floating membrane 5 is disposed between two adjacent filtering membranes 42, and in other embodiments, the number of the air floating membranes 5 may be adjusted according to the characteristics of the material, for example, when the zirconia nano-powder slurry is concentrated, because the viscosity is low, but the solid content is high, the air floating membranes 5 may be disposed by separating the two filtering membranes 42, that is, two filtering membranes 42 are disposed between two adjacent air floating membranes 5, so that the stability of the permeation flux of the system can be ensured.

In this embodiment, both the filtering membrane 42 and the air flotation membrane 5 are detachably connected to the hollow rotating shaft 41, the filtering membrane 42 and the air flotation membrane 5 have the same structure, that is, the filtering membrane 42 and the air flotation membrane 5 can be the same membrane, but the functions of the two are different, and the filtering membrane 42 and the air flotation membrane 5 can exchange installation positions. In a certain time period, the installation positions of the filtering membrane 42 and the air floating membrane 5 can be exchanged; when the installation positions of the filter membrane 42 and the air supply device are changed, the external air supply device supplies air to the inside of the filter membrane 42 through the second air inlet channel 413, and the air is discharged from the filter holes of the filter membrane 42 to play a role in cleaning the filter membrane 42.

In another embodiment, the air supporting aeration unit is fixedly arranged on the bottom wall of the accommodating cavity, the hollow rotating shaft 41 can rotate relative to the air supporting membrane 5, the air supporting aeration unit of the embodiment can be a micro-nano bubble generator or a jet aerator, and the micro-nano bubble generator is communicated with an external air supply device.

In fig. 2, the separation tank 2 includes a tank body 21 and an upper cover 22, the upper cover 22 is provided with a press bolt (not shown in the figure), the upper cover 22 is tightly connected with the tank body 21 through the press bolt, and the upper cover 22 is connected with the upper part of the tank body 21 through a sealing ring in a sealing manner. A liquid discharge pipe 23 is arranged at the top of the upper cover 22, the liquid discharge pipe 23 is communicated with the interior of the tank body 21, and the liquid discharge pipe 23 also has an air exhaust function. The tank body 21 is provided with a liquid inlet pipe 24 and a sewage discharge pipe 25 at the bottom thereof, the liquid inlet pipe 24 and the sewage discharge pipe 25 are respectively arranged at the left and right sides of the separation tank 2, and the liquid inlet pipe 24 and the liquid discharge pipe 23 are preferably arranged diagonally. The liquid inlet pipe 24 of the separation tank 2 is connected with a liquid conveying pump, liquid is conveyed into the separation tank 2 through the liquid conveying pump, penetrating liquid enters the interior of the filtering membrane 42 and is guided out from the penetrating liquid outlet 412 through a penetrating liquid channel, and intercepted concentrated liquid is remained outside the filtering membrane 42 and is discharged through the liquid discharge pipe 23. The liquid inlet pipe 24 and the sewage discharge pipe 25 are respectively provided with a pressure detector, and the upper part of the separation tank 2 is also provided with a pressure detector.

This embodiment still can set up the speed governing unit, through the rotational speed of adjustment membrane filtration unit 4 to satisfy and handle to characteristics such as the different viscosity of material, solid contain, and can handle the sewage of different degrees, application scope is wide.

The device of this embodiment compact structure, appearance size are little, and manufacturing cost is lower, and applicable majority manufacturing enterprise or sewage treatment enterprise satisfy the processing to different types of material or sewage, have obvious considerable economic benefits.

The process of tooling: the driving motor drives the hollow rotating shaft 41 to rotate through the speed reducer, and then drives all the filtering membranes 42 to rotate, the liquid inlet pipe 24 of the separating tank 2 is provided with a liquid conveying pump, the liquid conveying pump conveys liquid into the tank body 21, concentrated liquid is discharged through the liquid discharge pipe 23, pressure difference between the inside and the outside of the tank body 21 is caused by the liquid conveying pump or a leachate negative pressure suction pump, and then filtered leachate passes through filtering holes of the filtering membranes 42 and is pressed into the water production channel 421 and the inside of the hollow rotating shaft 41, and finally is led out through a leachate outlet 412. During the period, the external air supply device is opened and compressed air is conveyed to the air floatation aeration unit, so that a large amount of micro-nano bubbles are discharged to the fluid in the separation tank 2 by the air floatation aeration unit, air floatation turbulence disturbance is carried out on the fluid, and sufficient turbulence of the fluid in the separation tank 2 is promoted.

In conclusion, when the rotary driving unit drives the membrane filtering unit to rotate, the fluid in the accommodating cavity can generate disordered turbulence, a large amount of micro-nano bubbles are discharged by the air floatation aeration unit, and under the matching action of rotary centrifugal force and shearing force, the micro-nano bubbles can explode to form vortex, so that the disorder degree of the turbulence can be enhanced; the micro-nano bubbles are adhered to pollutants or particles in the fluid in the rising process, so that the buoyancy of the pollutants or the particles is larger than the gravity and the floating resistance, the pollutants or the particles float, the pollutants or the particles are favorably reduced and deposited on the surface of the filtering membrane, the surface of the filtering membrane is swept, the concentration polarization is weakened, and the membrane pollution is reduced.

Finally, it should be emphasized that the above-described preferred embodiments of the present invention are merely examples of implementations, not limitations, and various changes and modifications may be made by those skilled in the art, without departing from the spirit and scope of the invention, and any changes, equivalents, improvements, etc. made within the spirit and scope of the present invention are intended to be embraced therein.

Claims (10)

1. Micro-nano air supporting filtration, including holding chamber, rotation driving unit and membrane filter unit, the membrane filter unit sets up hold the intracavity, rotation driving unit sets up hold the chamber outside, the rotation driving unit drive the membrane filter unit is rotatory, the membrane filter unit includes cavity rotation axis and filtration membrane, be provided with the sepage passageway in the cavity rotation axis, filtration membrane all sets up on the cavity rotation axis, be provided with in the filtration membrane and produce the water passageway, produce the water passageway with sepage passageway intercommunication, its characterized in that:

the holding cavity is also internally provided with an air flotation aeration unit, the air flotation aeration unit is arranged below the filtering membrane, and the air flotation aeration unit can discharge micro-nano bubbles.

2. The micro-nano air-flotation filter structure according to claim 1, characterized in that:

the air floatation aeration unit is an air floatation film, the air floatation film is arranged on the hollow rotating shaft and is positioned right below the filtering film, and the air floatation film can rotate along with the hollow rotating shaft.

3. The micro-nano air-flotation filter structure according to claim 2, characterized in that:

the air floatation membrane is provided with a first air inlet channel and a plurality of air outlet micropores, and the first air inlet channel is respectively communicated with the air outlet micropores;

and a second air inlet channel is also arranged in the hollow rotating shaft and is communicated with the first air inlet channel.

4. The micro-nano air-flotation filter structure according to claim 3, characterized in that:

a cross flow channel is formed between the filtering membrane and the air floating membrane and is communicated with the accommodating cavity.

5. The micro-nano air-flotation filter structure according to claim 4, characterized in that:

the filtration membrane is provided with a plurality of, the air supporting membrane with filtration membrane interval arrangement from top to bottom arranges, the air supporting membrane with filtration membrane parallel arrangement.

6. The micro-nano air-flotation filter structure according to any one of claims 3 to 5, characterized in that:

filtration membrane with the air supporting membrane all with the connection can be dismantled to the cavity rotation axis, filtration membrane with but air supporting membrane exchange mounted position, behind both exchange positions, second inlet channel with filtration membrane's product water passageway intercommunication.

7. The micro-nano air-flotation filter structure according to claim 1, characterized in that:

the air flotation aeration unit is arranged on the bottom wall of the accommodating cavity, and the hollow rotating shaft can rotate relative to the air flotation aeration unit.

8. Micro-nano air supporting filter equipment, its characterized in that: the micro-nano air-flotation filtering structure comprises a mounting bracket, a separating tank and the micro-nano air-flotation filtering structure of any one of the claims 1 to 7, wherein the separating tank is arranged on the mounting bracket, a membrane filtering unit and an air-flotation aeration unit of the micro-nano air-flotation filtering structure are arranged in the separating tank, and a rotation driving unit of the micro-nano air-flotation filtering structure is arranged outside the separating tank.

9. The micro-nano air-flotation filtering device according to claim 8, characterized in that:

one end of a hollow rotating shaft of the membrane filtering unit penetrates out of the separation tank, a penetrating fluid outlet is arranged at one end of the hollow rotating shaft penetrating out of the separation tank in a communicating manner, and the penetrating fluid outlet is communicated with a penetrating fluid channel of the hollow rotating shaft.

10. The micro-nano air-flotation filtering device according to claim 8, characterized in that:

the lower part of the separation tank is provided with a liquid inlet pipe and a sewage discharge pipe, the upper part of the separation tank is provided with a liquid discharge pipe, and the liquid inlet pipe, the sewage discharge pipe and the upper part of the separation tank are respectively provided with a pressure detector.

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