Suspended bubble aeration device and aeration method

Abstract

The invention belongs to the technical field of sewage treatment, and particularly discloses a suspended bubble aeration device which is used for being placed in an external pool and comprises a fan and a water tank, the water tank is provided with a water containing cavity; an air pipe assembly is arranged between the fan and the water tank; a flow guide pipe is connected and mounted below the water tank; a water inlet pipe is further arranged below the water tank and used for feeding water into the water containing cavity from the outside, and a water suction pump is arranged on the water inlet pipe; a membrane filament aeration disc is mounted in the water containing cavity and is communicated with a water guide pipe; liquid in the water containing cavity flows into the flow guide pipe through the membrane wire aeration disc and then flows out downwards; the invention also provides a method for applying the aeration device. According to the suspended bubble aeration device, the suspension time of bubbles in water is greatly prolonged, the aeration stroke is improved, the mass transfer rate is high, the oxygen dissolving efficiency is high, and aeration holes can be effectively prevented from being blocked.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to a suspended bubble aeration device and an aeration method. Background Art

[0002] In applications such as sewage treatment projects, aquaculture, black and odorous water bodies, and water environment governance, aeration and oxygenation are required; the commonly used oxygenation technology in the industry at present is bottom aeration. Usually, aeration pipes are arranged at the bottom of the pool, and the gas floats up after aeration in the bottom aeration pipes; it diffuses out in the form of microbubbles through micropores to achieve aeration and oxygenation of the water body.

[0003] In terms of wastewater biochemical treatment, the water depth of most aeration tanks is designed to be 4 - 6 meters. The microbubbles float up in the water after being released from the aeration head and overflow the water surface in about ten seconds. Therefore, the mass transfer rate is low, the concentration of dissolved oxygen is difficult to reach saturation, and usually the utilization rate of dissolved oxygen is between 10% - 30%. If the water depth is too low, the oxygen utilization rate is even lower, while if the water depth is too high, the aeration power increases proportionally and the energy consumption is higher. More than 40% of the energy consumption in wastewater treatment is consumed in aeration. Therefore, the water depth of most aeration tanks is designed between 4 - 6 meters.

[0004] For some special water qualities, there are usually a lot of impurities at the bottom of the pool. After the aeration head operates for a period of time, it will scale or even block the aeration holes. Especially for the intermittently operating aeration head, it is more likely to scale and block. When the efficiency is reduced to a certain extent, the aeration head needs to be cleaned or replaced. The aeration heads are all arranged at the bottom of the pool, and cleaning and replacement are relatively troublesome. It may even require production suspension, which is very inconvenient and urgently needs improvement. Summary of the Invention

[0005] The purpose of the present invention is to provide a suspended bubble aeration device and an aeration method that greatly enhance the suspension time of bubbles in water, increase the aeration stroke, have a fast mass transfer rate, and a high dissolved oxygen efficiency.

[0006] The above purpose is achieved through the following technical solutions: A suspended bubble aeration device for being placed in an external pool, which includes a blower and a water tank; the water tank is provided with a water-containing cavity; an air pipe assembly is arranged between the blower and the water tank; a diversion pipe is connected and installed below the water tank; a water inlet pipe is further arranged below the water tank for introducing water into the water-containing cavity from the outside, and a water pump is arranged on the water inlet pipe;

[0007] A membrane filament aeration disc is installed in the water-containing cavity, and the membrane filament aeration disc is communicated with the diversion pipe; the liquid in the water-containing cavity flows through the membrane filament aeration disc into the diversion pipe and then flows downward;

[0008] The membrane filament aeration disc is provided with an air disc pipe, and an air inlet pipe and a plurality of membrane filaments are arranged in the air disc pipe; one end of the air pipe assembly is connected to the blower, and the other end is communicated with the air inlet pipe;

[0009] The membrane filaments are of a hollow tube structure, with a number of air holes provided on the tube wall. The membrane filaments include a front end and a rear end. The front end of the membrane filament is connected to the outer wall of the air inlet pipe, and the rear end of the membrane filament is clamped at the inner wall of the air disc pipe. The front end of the membrane filament is open and communicates with the air inlet pipe. The rear end of the membrane filament is a closed end.

[0010] The air flow generated by the fan flows from the air pipe assembly into the air inlet pipe, and then from the air inlet pipe into a number of membrane filaments, and is aerated outward through a number of air holes on the membrane filaments.

[0011] Furthermore, the number of the guide pipes and the number of the membrane filament aeration discs are both multiple and correspond to each other one by one. The air pipe assembly includes a main pipe and a branch pipe channel. The air flow generated by the fan passes through the main pipe, flows into the branch pipe channel, and then flows into each membrane filament aeration disc through the branch pipe channel respectively.

[0012] Furthermore, the membrane filament aeration disc is also provided with a mounting ring. The rear end of the membrane filament is connected to the inner wall of the mounting ring. The mounting ring, the air inlet pipe and the membrane filament together form a membrane filament ring.

[0013] Furthermore, the outer wall of the mounting ring is clamped against the inner wall of the air disc pipe, and the membrane filament ring moves up and down along the inner wall of the air disc pipe for adjustment.

[0014] Furthermore, the upper end of the guide pipe is connected to the lower end of the air disc pipe, and the inner diameter of the guide pipe is the same as the inner diameter of the air disc pipe. The membrane filament ring moves downward from the inner wall of the air disc pipe to the inner wall of the guide pipe and moves up and down along the inner wall of the guide pipe for adjustment.

[0015] Furthermore, the number of the guide pipes is four and the number of the membrane filament aeration discs is four.

[0016] Furthermore, the suspended bubble aeration device is also provided with a water pipe mounting bracket. The upper end of the water pipe mounting seat is installed in the water containing cavity, and the lower end passes through the bottom surface of the water containing cavity downward and is connected to the water inlet pipe.

[0017] Furthermore, an annular mounting seat is provided on the outer wall of the lower end of the air disc pipe. One or more mounting holes are provided on the mounting seat for fixedly installing the membrane filament aeration disc on the bottom surface of the water containing cavity.

[0018] The present invention also provides an aeration method using the suspended bubble aeration device as claimed in the claims. The guide pipe is inserted into an external water pool, and the upper end of the water tank is exposed above the water surface of the external water pool. The water pump pumps water from the external water pool into the water tank through the water inlet pipe, and a first water surface is formed in the water tank.

[0019] Water in the external water tank enters the flow guide pipe through the lower port of the flow guide pipe, forming a second water surface; the membrane filaments are arranged below the second water surface; the first water surface is higher than the second water surface, and the water in the water tank flows downward into the flow guide pipe through the membrane filament aeration disk, generating a water flow velocity V1, and in the flow guide pipe, the water above will move downward;

[0020] The air holes in the membrane filaments aerate the water below the second water surface, generating bubbles. The bubbles will generate buoyancy, causing the bubbles to move upward; according to Stokes' law, the rising speed of the bubbles in the water is proportional to the square of the bubble diameter, and the smaller the bubble, the slower the rising speed; the floating speed generated by a bubble with a diameter of R in the water is V2;

[0021] When the water flow velocity V1 is equal to the floating speed V2, the bubbles emitted from the air holes of the membrane filaments are suspended in the water;

[0022] When the water flow velocity V1 is greater than the floating speed V2, the bubbles emitted from the air holes of the membrane filaments move downward with the water flow in the flow guide pipe, and then float upward after flowing out from the lower port of the flow guide pipe;

[0023] By adjusting the water flow velocity V1 or the floating speed V2, the moving state of the bubbles in the water is controlled;

[0024] Among them, the water flow velocity V1 is controlled by the liquid level difference between the first water surface and the second water surface, and the liquid level difference between the first water surface and the second water surface is controlled and adjusted by a water pump; the floating speed V2 is controlled by the diameter of the air holes of the membrane filaments.

[0025] Furthermore, according to: pV = nRT; the volume of the bubble is inversely proportional to the pressure;

[0026] Where p is the pressure, V is the volume, n is the amount of substance, R is the gas constant, and T is the thermodynamic temperature;

[0027] The water pressure received by the bubbles in the flow guide pipe gradually increases as the bubbles move downward, and the volume of the bubbles gradually decreases; when the pressure reaches a certain value, the gas in the bubbles is dissolved into the water through the gas-liquid interface;

[0028] By adjusting the diameter or pressure of the bubbles emitted from the air holes, the dissolution state of the bubbles is controlled;

[0029] Among them, the bubble diameter is controlled by the diameter of the air holes of the membrane filaments, and the pressure is controlled by the position of the membrane filaments below the second water surface.

[0030] The present invention has the following beneficial effects:

[0031] 1. By setting up a water pump to pump water, a liquid level difference is formed, and then a water flow rate is generated. By controlling the water flow rate and the bubble diameter, the suspension state of the bubbles in water is controlled, greatly increasing the moving distance of the bubbles in water. Different from the traditional bottom aeration method, the travel distance of the top-down aeration bubbles is twice that of the bottom aeration. Moreover, while aerating, the water body circulates from top to bottom, reducing the energy consumption of the pusher stirring.

[0032] 2. In the present invention, the aeration device does not need to be installed at the bottom of the pool, so there will be no sediment accumulation blocking the air holes, greatly reducing the probability of maintenance. Moreover, since there is no need to install equipment at the bottom of the pool, during the maintenance process of wastewater treatment, there is no need to stop production and empty the pool as required in traditional operations, and it does not affect the design of the pool volume; it has strong practicability.

[0033] 3. During the downward movement of the bubbles, the pressure received continuously increases, the mass transfer rate is fast, and the dissolved oxygen efficiency is high. Moreover, the suspension time of the bubbles in water can be adjusted and controlled, with wide adaptability and flexible application.

[0034] 4. In the present invention, the equipment has a simple structure, low comprehensive operation energy consumption, is convenient for maintenance and replacement, and has a low maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Shows a schematic structural diagram of a suspended bubble aeration device of the present invention;

[0036] Figure 2 Shows a schematic structural diagram of the bottom view of a suspended bubble aeration device of the present invention;

[0037] Figure 3 Shows a schematic structural diagram of a partial structure of the present invention;

[0038] Figure 4 Shows a schematic structural diagram of the membrane filament aeration disk of the present invention;

[0039] Figure 5 Shows a schematic structural diagram of the membrane filament ring of the present invention;

[0040] Figure 6 Shows a schematic structural diagram of the membrane filament aeration disk and the diversion pipe of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0041] In the description of the present invention, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0043] As Figures 1 to 6 shown, it is a schematic structural diagram of the suspended bubble aeration device of the present invention; the suspended bubble aeration device of the present invention is used to be placed in an external water tank, and it includes a blower 1 and a water tank 2; the water tank 2 is provided with a water-containing cavity 21; an air pipe assembly 6 is arranged between the blower 1 and the water tank 2; a diversion pipe 5 is connected and installed below the water tank 2; a water inlet pipe 4 is also provided below the water tank 2 for introducing water into the water-containing cavity 21 from the outside, and a water pump 3 is arranged on the water inlet pipe 4;

[0044] A membrane filament aeration disc 7 is installed in the water-containing cavity 21, and the membrane filament aeration disc 7 is communicated with the diversion pipe 5; the liquid in the water-containing cavity 21 flows through the membrane filament aeration disc 7 into the diversion pipe 5 and then flows out downward;

[0045] The membrane filament aeration disc 7 is provided with an air disc pipeline 71, and an air inlet pipeline 72 and a plurality of membrane filaments 8 are arranged in the air disc pipeline 71; one end of the air pipe assembly 6 is connected to the blower 1, and the other end is communicated with the air inlet pipeline 72;

[0046] The membrane filament 8 has a hollow tube structure, and a plurality of air holes are arranged on the tube wall. The membrane filament 8 includes a membrane filament front end 81 and a membrane filament rear end 82; the membrane filament front end 81 is connected to the outer wall of the air inlet pipeline 72, and the membrane filament rear end 82 is clamped at the inner wall of the air disc pipeline 71; the membrane filament front end 81 is in an open shape and is communicated with the air inlet pipeline 72; the membrane filament rear end 82 is a closed end;

[0047] The air flow generated by the blower 1 flows from the air pipe assembly 6 into the air inlet pipeline 72, then from the air inlet pipeline 72 into a plurality of membrane filaments 8, and aerates outward through a plurality of air holes on the membrane filaments 8.

[0048] As a preferred embodiment, the number of the draft tubes 5 and the number of the membrane filament aeration disks 7 are both plural and correspond to each other one by one; by way of example, the number of the draft tubes 5 is four and the number of the membrane filament aeration disks 7 is four. The air pipe assembly 6 includes a main pipe 61 and a branch pipe channel 62; the air flow generated by the blower 1 passes through the main pipe 61, flows to the branch pipe channel 62, and then flows to each membrane filament aeration disk 7 through the branch pipe channel 62 respectively.

[0049] In the present invention, as a preferred solution, the membrane filament aeration disk 7 is further provided with a mounting ring 74; the rear end 82 of the membrane filament is connected to the inner wall of the mounting ring 74; the mounting ring 74, the air inlet pipe 72 and the membrane filament 8 together form a membrane filament ring; the outer wall of the mounting ring 74 is clamped on the inner wall of the air disk pipe 71, and the membrane filament ring moves up and down along the inner wall of the air disk pipe 71 for adjustment.

[0050] The upper end of the draft tube 5 is connected to the lower end of the air disk pipe 71, and the inner diameter of the draft tube 5 is the same as the inner diameter of the air disk pipe 71; the membrane filament ring moves downward from the inner wall of the air disk pipe 71 to the inner wall of the draft tube 5 and moves up and down along the inner wall of the draft tube 5 for adjustment.

[0051] For the convenience of installation, the suspended bubble aeration device is further provided with a water pipe mounting seat 41. The upper end of the water pipe mounting seat 41 is installed in the water containing cavity 21, and the lower end passes through the bottom surface of the water containing cavity 21 and extends downward to be connected to the water inlet pipe 4; an annular mounting seat 73 is arranged on the outer wall of the lower end of the air disk pipe 71, and one or more mounting holes are arranged on the mounting seat 73 for fixedly installing the membrane filament aeration disk 7 on the bottom surface of the water containing cavity 21.

[0052] The present invention further provides an aeration method using the above-mentioned suspended bubble aeration device, that is, inserting the draft tube 5 into an external water pool, and the upper end of the water tank 2 is exposed above the water surface of the external water pool; the water pump 3 pumps water from the external water pool into the water tank through the water inlet pipe 4, and a first water surface is formed in the water tank.

[0053] In a water body, there are two connected liquid surfaces with a height difference. The water in the higher liquid surface will flow towards the lower liquid surface. When the higher liquid surface is at the diversion pipe, a water flow with a certain velocity will be formed in the diversion pipe, and the velocity is directly proportional to the height difference. The greater the height difference, the faster the velocity. For example, the rising velocity of a bubble with a diameter of 1 mm in water is about 0.1 m / s. Therefore, as long as the water flow velocity from top to bottom in the diversion pipe is equal to 0.1 m / s, it can offset the rising velocity of a bubble with a diameter of 1 mm, and at this time the bubble will be in a suspended state; if the water flow velocity is less than 0.1 m / s, the bubble will float up and overflow the water surface in the diversion pipe; if the water flow velocity is greater than 0.1 m / s, the bubble will move downward and finally discharge from the bottom of the pipe, and then float up and overflow the water surface, and the travel of the bubble is twice that released from the bottom. The smaller the bubble diameter, the slower the water flow velocity required for suspension. Therefore, by adjusting the water flow velocity or the bubble diameter, the residence time of the bubble in water can be controlled.

[0054] Therefore, in the present invention, the water in the external water tank enters the diversion pipe 5 through the lower port of the diversion pipe 5 to form a second water surface; the membrane filaments 8 are arranged below the second water surface; the first water surface is higher than the second water surface, and the water in the water tank flows downward through the membrane filament aeration disk 7 into the diversion pipe 5, generating a water flow velocity V1, and in the diversion pipe 5, the water above will move downward;

[0055] The air holes in the membrane filaments 8 aerate the water below the second water surface to generate bubbles, and the bubbles will generate buoyancy, causing the bubbles to move upward; according to Stokes' law, the rising velocity of the bubbles in water is directly proportional to the square of the bubble diameter, and the smaller the bubble, the slower the rising velocity; the rising velocity generated by a bubble with a diameter of R in water is V2;

[0056] When the water flow velocity V1 is equal to the rising velocity V2, the bubbles ejected from the air holes of the membrane filaments 8 are suspended in water;

[0057] When the water flow velocity V1 is greater than the rising velocity V2, the bubbles ejected from the air holes of the membrane filaments 8 move downward with the water flow in the diversion pipe 5 and then float up after flowing out from the lower port of the diversion pipe 5;

[0058] By adjusting the water flow velocity V1 or the rising velocity V2, the moving state of the bubbles in water is controlled;

[0059] Among them, the water flow velocity V1 is controlled by the liquid level difference between the first water surface and the second water surface, and the liquid level difference between the first water surface and the second water surface is controlled and adjusted by a water pump; the rising velocity V2 is controlled by the diameter of the air holes of the membrane filaments 8.

[0060] In an ideal state, the volume of the bubble is inversely proportional to the pressure. According to:

[0061] pV = nRT Formula 1;

[0062] It can be seen that the volume of the bubble is inversely proportional to the pressure;

[0063] Where p is pressure, V is volume, n is the amount of substance, R is the gas constant, and T is the thermodynamic temperature;

[0064] The water pressure exerted on the bubbles in the draft tube 5 gradually increases as the bubbles move downward, and the volume of the bubbles gradually decreases; when the pressure reaches a certain value, the gas transferred by the bubbles in the water dissolves into the water through the gas-liquid interface;

[0065] This equation shows that under given conditions, the volume of the bubbles decreases when the pressure increases. When bottom aeration is used for oxygenation, only when the bubbles continuously float upward, the water pressure they are subjected to continuously decreases, and the volume of the bubbles increases; when top-down aeration is used, the opposite is true, and the volume of the bubbles will decrease as the water pressure increases.

[0066] In the present invention, the dissolution state of the bubbles is controlled by adjusting the diameter or pressure of the bubbles ejected from the pores; wherein the bubble diameter is controlled by the pore diameter of the membrane filaments 8, and the pressure is controlled by the position of the membrane filaments 8 below the second water surface.

[0067] Therefore, in the present invention, an aeration method opposite to the traditional bottom aeration is adopted. Aerate the water through a blower, and the bubbles are generated in the water by the membrane filament aeration disk. The bubbles are released at a position 10 - 50 cm below the liquid surface in the vertical draft tube, and the height of the membrane filament aeration disk can be freely adjusted according to the aeration requirement. At the same time, a water pump is used to lift the water and inject it downward into the draft tube to form a water flow. The bubbles flow to the bottom of the pool along with the water flow through the draft tube, and then spread out from the bottom of the pool to the surroundings.

[0068] Generally, the water pressure change is not significant at a general water depth, but when the water depth reaches 20 - 50 meters for deep water aeration, when the bubbles reach the bottom, they will be under a pressure of 2 - 5 atmospheres. The bubbles are forced to transfer gas into the water and dissolve into the water through the gas-liquid interface, and the mass transfer rate is several times that of ordinary aeration. The dissolved oxygen in the water body will also exceed the saturation state and reach more than 80 mg / L. When the water depth reaches 70 - 150 meters for deep well aeration, the bubbles will be under a maximum pressure of 7 - 15 atmospheres. The bubbles will not only become smaller, but according to the Young-Laplace equation, ΔP = 2σ / r (ΔP represents the value of the pressure increase, σ represents the surface tension, and r represents the bubble radius), as the bubbles become smaller, they will also generate additional pressure on their own and will eventually completely dissolve into the water. Then, as the water body circulates and the pressure continuously decreases, the gas will precipitate from the water to form bubbles and float to the water surface.

[0069] For the water body in an oxygen-consuming state with the purpose of oxygenation, a too long residence time of the bubbles is not the best method. After the oxygen mass transfer is completed, they should be replaced. At this time, it is necessary to make the bubbles stay for a certain time and then overflow the water surface to leave space for the newly entering air, and control the bubble residence time as appropriate according to the oxygen consumption requirement.

[0070] When the mass transfer rate of oxygenation is too high, increase the aeration volume and water flow rate to obtain a higher oxygenation power efficiency. The aeration gas can be air, pure oxygen or other gases.

[0071] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A suspended bubble aeration device, for placement in an external water pool, comprising a fan (1) and a water tank (2); the water tank (2) is provided with a water containing cavity (21); an air pipe assembly (6) is provided between the fan (1) and the water tank (2); characterized in that: A flow guide pipe (5) is connected and installed below the water tank (2); a water inlet pipe (4) is also provided below the water tank (2) for supplying water from the outside into the water containing cavity (21); a water pump (3) is provided on the water inlet pipe (4); A membrane aeration plate (7) is installed in the water containing chamber (21), and the membrane aeration plate (7) is connected to the water guide pipe (5); the liquid in the water containing chamber (21) flows into the water guide pipe (5) through the membrane aeration plate (7) and then flows out downwards; The membrane aeration disc (7) is provided with an air disc pipeline (71), and an air intake pipeline (72) and a plurality of membrane threads (8) are provided in the air disc pipeline (71); one end of the air pipe assembly (6) is connected to the fan (1), and the other end is communicated with the air intake pipeline (72); The membrane thread (8) is a hollow tube structure, and a plurality of air holes are provided on the tube wall. The membrane thread (8) comprises a membrane thread front end (81) and a membrane thread rear end (82); the membrane thread front end (81) is connected to the outer wall of the air intake pipe (72), and the membrane thread rear end (82) is clamped on the inner wall of the air disk pipe (71); the membrane thread front end (81) is open and communicates with the air intake pipe (72); the membrane thread rear end (82) is a closed end; The airflow generated by the fan (1) flows from the air pipe assembly (6) to the air inlet pipe (72), and then flows from the air inlet pipe (72) to a plurality of membrane threads (8), and is aerated outward through a plurality of air holes on the membrane threads (8).

2. The suspended bubble aeration device according to claim 1, characterized in that: The number of the guide pipes (5) and the number of the membrane aeration discs (7) are both multiple and correspond one to one; the air pipe assembly (6) comprises a main pipe (61) and a branch pipe channel (62); the air flow generated by the fan (1) passes through the main pipe (61), flows to the branch pipe channel (62), and then flows to each membrane aeration disc (7) through the branch pipe channel (62).

3. The suspended bubble aeration device according to claim 1, characterized in that: The membrane aeration disc (7) is also provided with a mounting ring (74); the rear end (82) of the membrane is connected to the inner wall of the mounting ring (74); the mounting ring (74), the air inlet pipe (72) and the membrane (8) together form a membrane ring.

4. The suspended bubble aeration device according to claim 3, characterized in that: The outer wall of the mounting ring (74) is blocked on the inner wall of the gas disc pipe (71), and the membrane wire ring moves up and down along the inner wall of the gas disc pipe (71) for adjustment.

5. The suspended bubble aeration device according to claim 4, characterized in that: The upper end of the guide tube (5) is connected to the lower end of the gas disc pipe (71), and the inner diameter of the guide tube (5) is the same as the inner diameter of the gas disc pipe (71); the membrane wire ring moves downward from the inner wall of the gas disc pipe (71) to the inner wall of the guide tube (5), and moves up and down along the inner wall of the guide tube (5) for adjustment.

6. The suspended bubble aeration device according to claim 2, characterized in that: The number of the flow guide pipes (5) is four and the number of the membrane aeration plates (7) is four.

7. The suspended bubble aeration device according to claim 1, characterized in that: The suspended bubble aeration device is also provided with a water pipe mounting seat (41), the upper end of which is mounted in the water containing cavity (21), and the lower end of which passes through the bottom surface of the water containing cavity (21) downward and is connected to the water inlet pipe (4).

8. The suspended bubble aeration device according to claim 1, characterized in that: The lower end outer wall of the air disc pipeline (71) is provided with an annular mounting seat (73), and the mounting seat (73) is provided with one or more mounting holes for fixing the membrane aeration disc (7) on the bottom surface of the water containing chamber (21).

9. An aeration method using the suspended bubble aeration device according to claim 1, characterized in that: The guide pipe (5) is inserted into the external water pool, and the upper end of the water tank (2) is exposed above the water surface of the external water pool; the water pump (3) pumps water from the external water pool into the water tank through the water inlet pipe (4), and a first water surface is formed in the water tank; The water in the external water pool flows into the flow guide pipe (5) through the lower port of the flow guide pipe (5), forming a second water surface; the membrane fibers (8) are arranged below the second water surface; the first water surface is higher than the second water surface, and the water in the water tank flows downward into the flow guide pipe (5) through the membrane fiber aeration plate (7), generating a water flow rate (V1), and the water at the upper part of the flow guide pipe (5) moves downward; The pores in the membrane filaments (8) aerate the water below the second water surface to generate bubbles, which generate buoyancy, causing the bubbles to move upward. According to Stokes' law, the rising speed of bubbles in water is proportional to the square of the bubble diameter, and the smaller the bubble, the slower the rising speed. The rising speed of bubbles with a diameter of R in water is (V2); When the water flow rate (V1) is equal to the buoyancy rate (V2), the bubbles released from the pores of the membrane filaments (8) are suspended in the water; When the water flow rate (V1) is greater than the floating speed (V2), the bubbles released from the pores of the membrane filaments (8) move downward with the water flow in the flow guide tube (5), flow out from the lower port of the flow guide tube (5), and then float upward; By adjusting the water flow rate (V1) or the floating speed (V2), the movement state of the bubble in the water is controlled; The water flow rate (V1) is controlled by the liquid level difference between the first water surface and the second water surface, and the liquid level difference between the first water surface and the second water surface is controlled and adjusted by a water pump; the buoyancy speed (V2) is controlled by the pore diameter of the membrane filament (8).

10. The aeration method according to claim 9, characterized in that: According to: pV = nRT formula (1); The volume of the bubble is inversely proportional to the pressure; Where p is pressure, V is volume, n is the amount of substance, R is the gas constant, and T is the thermodynamic temperature; The water pressure on the bubbles in the guide tube (5) gradually increases as the bubbles move downward, and the volume of the bubbles gradually decreases; when the pressure reaches a certain value, the gas transferred in the bubble water dissolves into the water through the gas-liquid interface; By adjusting the diameter or pressure of the bubbles exposed by the pores, the dissolution state of the bubbles is controlled; The bubble diameter is controlled by the pore diameter of the membrane filament (8), and the pressure is controlled by the position of the membrane filament (8) below the second water surface.

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