A suspended bubble aeration device and aeration method

Abstract

The present application belongs to sewage treatment technical field, especially disclose a kind of suspended bubble aeration device, for placing in external pool, it includes fan and water tank;The water tank is equipped with water containing cavity;Fan and water tank between being equipped with air pipe assembly;The lower portion of water tank is connected and installed with flow guide pipe;The lower portion of water tank is also equipped with water inlet pipe, for water inlet from outside to water containing cavity, water inlet pipe is equipped with water pump;Water containing cavity is installed with membrane silk aeration disc, the membrane silk aeration disc is communicated with flow guide pipe;Liquid in water containing cavity, by membrane silk aeration disc, flow to flow guide pipe, then flow out downward;The present application also provides a kind of method for applying the above aeration device;The suspended bubble aeration device of the present application greatly enhances the suspension time of bubble in water, improves aeration stroke, mass transfer rate is fast, and dissolved oxygen efficiency is high, and can effectively avoid aeration hole blockage.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a suspended bubble aeration device and aeration method. Background Technology

[0002] Aeration is required in wastewater treatment projects, aquaculture, black and odorous water bodies and water environment treatment. The most commonly used aeration technology in the industry is bottom aeration, which usually involves setting up aeration pipes at the bottom of the pool. After the gas is aerated in the aeration pipes at the bottom, it floats to the surface and diffuses out in the form of microbubbles through micropores to achieve aeration and oxygenation of the water.

[0003] In wastewater biological treatment, most aeration tanks are designed with a water depth of 4 to 6 meters. Microbubbles are released from the aeration head and float to the surface in about ten seconds. As a result, the mass transfer rate is low, and the dissolved oxygen concentration is difficult to reach saturation. The utilization rate of dissolved oxygen is usually between 10% and 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, most aeration tanks are designed with a water depth of 4 to 6 meters.

[0004] For some special water qualities, the bottom of the pool usually contains a lot of impurities. After a period of operation, the aeration heads will accumulate scale or even block the aeration holes. This is especially true for aeration heads that operate intermittently, which are more prone to scale buildup and blockage. When the efficiency drops to a certain level, the aeration heads need to be cleaned or replaced. Since the aeration heads are all located at the bottom of the pool, cleaning and replacement are quite troublesome and may require shutdown, which is very inconvenient and urgently needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to provide a suspended bubble aeration device and aeration method that greatly enhances the suspension time of bubbles in water, increases the aeration range, has a fast mass transfer rate, and high oxygen dissolution efficiency.

[0006] The above objective is achieved through the following technical solution: a suspended bubble aeration device for placement in an external water tank, comprising a blower and a water tank; the water tank is provided with a water-containing cavity; an air pipe assembly is provided between the blower and the water tank; a guide pipe is connected and installed below the water tank; and a water inlet pipe is also provided below the water tank for water to enter the water-containing cavity from the outside, and a water pump is provided on the water inlet pipe.

[0007] A membrane fiber aeration disc is installed inside the water-containing cavity, and the membrane fiber aeration disc is connected to the guide pipe; the liquid in the water-containing cavity flows through the membrane fiber aeration disc into the guide pipe, and then flows downward.

[0008] The membrane fiber aeration disc is equipped with an air disc pipe, and the air disc pipe contains an air inlet pipe and several membrane fibers; one end of the air pipe assembly is connected to a blower, and the other end is connected to the air inlet pipe.

[0009] The membrane filament has a hollow tube structure with several air holes on the tube wall. The membrane filament includes 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 snapped into the inner wall of the air plate 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 closed.

[0010] The airflow generated by the fan flows from the air pipe assembly to the air inlet pipe, and then from the air inlet pipe to several membrane fibers, where it is aerated through several air holes on the membrane fibers.

[0011] Furthermore, the number of the guide pipes and the number of membrane fiber aeration discs are both multiple and correspond one-to-one; the air pipe assembly includes a main pipe and branch pipe channels; the airflow generated by the blower flows through the main pipe to the branch pipe channels, and then flows through the branch pipe channels to each membrane fiber aeration disc.

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

[0013] Furthermore, the outer wall of the mounting ring is engaged with the inner wall of the gas coil pipe, and the diaphragm ring moves up and down along the inner wall of the gas coil pipe for adjustment.

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

[0015] Furthermore, the number of the flow guide tubes is four and the number of the membrane fiber aeration discs is four.

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

[0017] Furthermore, the lower outer wall of the air disc pipe is provided with an annular mounting seat, and the mounting seat is provided with one or more mounting holes for fixing the membrane fiber 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 described in the claims, wherein the guide pipe is inserted into an external water tank, and the upper end of the water tank protrudes above the water surface of the external water tank; the water pump draws water from the external water tank into the water tank through the inlet pipe, and a first water surface is formed inside the water tank;

[0019] Water from the external pool enters the guide pipe through the lower end of the guide pipe, forming a second water surface; the membrane fiber is positioned below the second water surface; the first water surface is higher than the second water surface, and water in the water tank flows downward into the guide pipe through the membrane fiber aeration disc, generating a water flow velocity V1, and the water above in the guide pipe moves downward.

[0020] The pores in the membrane filament aerate the water below the second water surface, generating bubbles. These bubbles generate buoyancy, causing them to move upwards. According to Stokes' law, the upward speed of a bubble in water is proportional to the square of its diameter; the smaller the bubble, the slower its upward speed. The upward speed of a bubble with diameter R in water is V2.

[0021] When the water flow velocity V1 is equal to the buoyancy velocity V2, the air bubbles emitted from the pores of the membrane fibers are suspended in the water.

[0022] When the water flow velocity V1 is greater than the buoyancy velocity V2, the air bubbles exposed by the pores of the membrane fibers move downward with the water flow in the guide tube, then flow out from the lower end of the guide tube and float upward again.

[0023] The movement of the bubble in the water can be controlled by adjusting the water flow rate V1 or the buoyancy rate V2.

[0024] 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 buoyancy velocity V2 is controlled by the pore diameter of the membrane filament.

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

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

[0027] The water pressure on the bubble in the guide tube gradually increases as the bubble moves downward, and the volume of the bubble gradually decreases; when the pressure reaches a certain value, the gas in the bubble dissolves into the water through the gas-liquid interface.

[0028] The dissolution state of the bubbles can be controlled by adjusting the diameter or pressure of the bubbles aerated through the pores.

[0029] The bubble diameter is controlled by the pore diameter of the membrane filament, and the pressure is controlled by the position of the membrane filament below the second water surface.

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

[0031] 1. By setting up a water pump to draw water, a liquid level difference is created, which in turn generates water flow velocity. By controlling the water flow velocity and the bubble diameter, the suspension state of the bubbles in the water is controlled, which greatly increases the movement distance of the bubbles in the water. Unlike the traditional bottom aeration method, the bubble movement distance of top-down aeration is twice that of bottom aeration. Moreover, the water body is circulated from top to bottom while aerating, which reduces the energy consumption of propulsion and stirring.

[0032] 2. In this invention, the aeration device does not need to be installed at the bottom of the pool, so there will be no sludge accumulation clogging the air holes, which greatly reduces the probability of maintenance. Moreover, since there is no need to install equipment at the bottom of the pool, the maintenance of wastewater treatment does not require stopping production and emptying the pool during traditional operations, and it does not affect the pool volume design; it is highly practical.

[0033] 3. As the bubbles descend, the pressure they experience continuously increases, resulting in a rapid mass transfer rate and high oxygen dissolution efficiency. Furthermore, the suspension time of the bubbles in the water can be adjusted and controlled, making it widely adaptable and flexible in application.

[0034] 4. In this invention, the equipment has a simple structure, low overall operating energy consumption, convenient and simple maintenance and replacement, and low maintenance cost. Attached Figure Description

[0035] Figure 1 A schematic diagram of the structure of a suspended bubble aeration device according to the present invention is shown;

[0036] Figure 2 This diagram shows a bottom view of the structure of a suspended bubble aeration device according to the present invention.

[0037] Figure 3 A schematic diagram of a partial structure of the present invention is shown;

[0038] Figure 4 A schematic diagram of the structure of the membrane fiber aeration disc of the present invention is shown;

[0039] Figure 5 A schematic diagram of the structure of the membrane fiber ring of the present invention is shown;

[0040] Figure 6 A schematic diagram of the structure of the membrane fiber aeration disc and guide tube of the present invention is shown. Detailed Implementation

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] like Figures 1 to 6 The diagram shown is a structural schematic 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 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 provided between the blower 1 and the water tank 2. A 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 water to be introduced into the water-containing cavity 21 from the outside. A water pump 3 is provided on the water inlet pipe 4.

[0044] The water-containing cavity 21 is equipped with a membrane fiber aeration disc 7, which is connected to the guide pipe 5. The liquid in the water-containing cavity 21 flows through the membrane fiber aeration disc 7 into the guide pipe 5 and then flows downward.

[0045] The membrane fiber aeration disc 7 is provided with an air disc pipe 71, and the air disc pipe 71 is provided with an air inlet pipe 72 and a number of membrane fibers 8; one end of the air pipe assembly 6 is connected to the blower 1, and the other end is connected to the air inlet pipe 72.

[0046] The membrane filament 8 is a hollow tube structure with several air holes on its wall. The membrane filament 8 includes a front end 81 and a rear end 82. The front end 81 is connected to the outer wall of the air inlet pipe 72, and the rear end 82 is snapped into the inner wall of the air plate pipe 71. The front end 81 is open and communicates with the air inlet pipe 72. The rear end 82 is a closed end.

[0047] The airflow generated by the fan 1 flows from the air pipe assembly 6 to the air inlet pipe 72, and then from the air inlet pipe 72 to several membrane fibers 8, and aerates outward through several air holes on the membrane fibers 8.

[0048] In a preferred embodiment, the number of the guide pipes 5 and the number of membrane fiber aeration discs 7 are both multiple and correspond one-to-one; for example, the number of guide pipes 5 is four and the number of membrane fiber aeration discs 7 is four. The air pipe assembly 6 includes a main pipe 61 and branch pipe channels 62; the airflow generated by the blower 1 flows through the main pipe 61 to the branch pipe channels 62, and then flows through the branch pipe channels 62 to each membrane fiber aeration disc 7.

[0049] In this invention, as a preferred embodiment, the membrane fiber aeration disc 7 is further provided with an installation ring 74; the rear end 82 of the membrane fiber is connected to the inner wall of the installation ring 74; the installation ring 74, the air inlet pipe 72 and the membrane fiber 8 together form a membrane fiber ring; the outer wall of the installation ring 74 is stuck on the inner wall of the air disc pipe 71, and the membrane fiber ring moves up and down along the inner wall of the air disc pipe 71 for adjustment.

[0050] The upper end of the guide tube 5 is connected to the lower end of the air plate pipe 71, and the inner diameter of the guide tube 5 is the same as the inner diameter of the air plate pipe 71; the membrane fiber ring moves downward from the inner wall of the air plate 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.

[0051] For ease of installation, the suspended bubble aeration device is also provided with a water pipe mounting base 41. The upper end of the water pipe mounting base 41 is installed in the water holding chamber 21, and the lower end passes through the bottom surface of the water holding chamber 21 and is connected to the water inlet pipe 4. The lower end of the air disc pipe 71 is provided with an annular mounting base 73 on its outer wall. The mounting base 73 is provided with one or more mounting holes for fixing the membrane fiber aeration disc 7 on the bottom surface of the water holding chamber 21.

[0052] The present invention also provides an aeration method using the above-mentioned suspended bubble aeration device, wherein the guide pipe 5 is inserted into an external water tank, and the upper end of the water tank 2 is exposed above the water surface of the external water tank; the water pump 3 draws water from the external water tank into the water tank through the water inlet pipe 4, and a first water surface is formed in the water tank.

[0053] In a body of water, there are two connected liquid surfaces with a height difference. Water flows from the higher surface to the lower surface. When the higher surface is at a guide pipe, a water flow with a certain velocity will form within the guide pipe. The velocity is directly proportional to the height difference; the greater the height difference, the faster the velocity. For example, a 1mm diameter bubble rises in water at approximately 0.1m / s. Therefore, a downward water flow with a velocity of 0.1m / s within the guide pipe can counteract the rising velocity of a 1mm diameter bubble, keeping it suspended. If the water velocity is less than 0.1m / s, the bubble will float to the surface within the guide pipe. If the water velocity is greater than 0.1m / s, the bubble will descend and eventually exit from the bottom of the guide pipe before rising again to the surface. The bubble's journey is twice the distance it travels from the bottom. The smaller the bubble diameter, the slower the water velocity that needs to be counteracted for suspension. Therefore, by adjusting the water velocity or the bubble diameter, the residence time of the bubble in the water can be controlled.

[0054] Therefore, in this invention, the water in the external water tank enters the guide pipe 5 through the lower port of the guide pipe 5 to form a second water surface; the membrane fiber 8 is disposed 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 guide pipe 5 through the membrane fiber aeration disc 7, generating a water flow velocity V1, and the water above in the guide pipe 5 will move downward.

[0055] The pores in the membrane filament 8 aerate the water below the second water surface, generating bubbles. These bubbles generate buoyancy, causing them to move upwards. According to Stokes' law, the upward speed of a bubble in water is proportional to the square of its diameter; the smaller the bubble, the slower its upward speed. The upward speed of a bubble with diameter R in water is V2.

[0056] When the water flow velocity V1 is equal to the buoyancy velocity V2, the air bubbles emitted from the pores of the membrane fiber 8 are suspended in the water.

[0057] When the water flow velocity V1 is greater than the buoyancy velocity V2, the air bubbles exposed by the pores of the membrane fiber 8 move downward with the water flow in the guide tube 5, then flow out from the lower end of the guide tube 5 and float upward again.

[0058] The movement of the bubble in the water can be controlled by adjusting the water flow rate V1 or the buoyancy rate V2.

[0059] 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 buoyancy velocity V2 is controlled by the pore diameter of the membrane filament 8.

[0060] In an ideal state, the volume of a bubble is inversely proportional to its pressure, according to:

[0061] pV=nRT Formula 1;

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

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

[0064] The water pressure on the bubble in the guide tube 5 gradually increases as the bubble moves downward, and the volume of the bubble gradually decreases; when the pressure reaches a certain value, the gas in the bubble dissolves into the water through the gas-liquid interface.

[0065] This equation shows that, under given conditions, the bubble volume decreases as pressure increases. When bottom aeration is used, the bubbles only rise continuously, and the water pressure they experience decreases, causing the bubble volume to increase. Conversely, when top-down aeration is used, the bubble volume decreases as water pressure increases.

[0066] In this invention, the dissolution state of the bubbles is controlled by adjusting the diameter or pressure of the bubbles amplified by the pores; wherein 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.

[0067] Therefore, in this invention, an aeration method opposite to traditional bottom aeration is adopted. A blower aerates the water, and bubbles are generated in the water by the membrane fiber aeration disc. The bubbles are released 10-50 cm below the liquid surface in the vertical guide pipe. The height of the membrane fiber aeration disc can be freely adjusted according to the aeration requirements. At the same time, a water pump lifts the water into the guide pipe from top to bottom to form a water flow. The bubbles flow to the bottom of the pool with the water flow through the guide pipe and then diffuse outward from the bottom of the pool.

[0068] In general, the pressure change at different water depths is not significant. However, when the aeration bubbles reach the bottom of deep-water aeration systems at depths of 20–50 meters, they will be subjected to a pressure of 2–5 atmospheres. This pressure forces the bubbles to transfer gas into the water, dissolving them through the gas-liquid interface. The mass transfer rate is several times that of ordinary aeration, and the dissolved oxygen in the water will exceed saturation, reaching over 80 mg / L. In deep well aeration systems at depths of 70–150 meters, the bubbles will be subjected to a maximum pressure of 7–15 atmospheres. The bubbles not only become smaller, but according to the Yang-Laplace equation, ΔP = 2σ / r (ΔP represents the pressure rise, σ represents surface tension, and r represents the bubble radius), they will also generate their own pressure as they shrink, eventually dissolving completely into the water. Then, as the water circulates and the pressure gradually decreases, the gas will precipitate from the water, forming bubbles that rise to the surface.

[0069] For water bodies in an oxygen-consuming state, the purpose of increasing oxygen is not to increase the residence time of bubbles for too long. After the oxygen mass transfer is completed, the bubbles should be replaced. At this time, the bubbles need to stay for a certain period of time before overflowing the water surface to make room for newly introduced air. The residence time of the bubbles should be controlled according to the oxygen demand.

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

[0071] The above description is merely a preferred embodiment of the present invention and is 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 described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A suspended bubble aeration device for placement in an external water tank, comprising a blower (1) and a water tank (2); the water tank (2) having a water-containing cavity (21); and an air pipe assembly (6) provided between the blower (1) and the water tank (2); characterized in that, A 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 water to enter the water chamber (21) from the outside; a water pump (3) is provided on the water inlet pipe (4); The water-containing cavity (21) is equipped with a membrane fiber aeration disc (7), which is connected to the guide pipe (5). The liquid in the water-containing cavity (21) flows through the membrane fiber aeration disc (7) into the guide pipe (5) and then flows downward. The membrane fiber aeration disc (7) is provided with an air disc pipe (71), and the air disc pipe (71) is provided with an air inlet pipe (72) and a number of membrane fibers (8); one end of the air pipe assembly (6) is connected to the blower (1), and the other end is connected to the air inlet pipe (72); The membrane filament (8) is a hollow tube structure with several air holes on its wall. The membrane filament (8) includes a front end (81) and a rear end (82). The front end (81) is connected to the outer wall of the air inlet pipe (72), and the rear end (82) is snapped into the inner wall of the air plate pipe (71). The front end (81) is open and communicates with the air inlet pipe (72). The rear end (82) is closed. The airflow generated by the fan (1) flows from the air pipe assembly (6) to the air inlet pipe (72), and then from the air inlet pipe (72) to several membrane fibers (8), and aerates outward through several air holes on the membrane fibers (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 fiber aeration discs (7) are both multiple and correspond one-to-one; the air pipe assembly (6) includes a main pipe (61) and a branch pipe channel (62); the airflow generated by the blower (1) flows through the main pipe (61) to the branch pipe channel (62), and then flows through the branch pipe channel (62) to each membrane fiber aeration disc (7).

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

4. The suspended bubble aeration device according to claim 3, characterized in that, The outer wall of the mounting ring (74) is engaged with the inner wall of the air plate pipe (71), and the membrane wire ring moves up and down along the inner wall of the air plate 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 air plate pipe (71), and the inner diameter of the guide tube (5) is the same as the inner diameter of the air plate pipe (71); the membrane fiber ring moves downward from the inner wall of the air plate 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 guide tubes (5) is four and the number of the membrane fiber aeration discs (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 base (41). The upper end of the water pipe mounting base (41) is installed in the water holding chamber (21), and the lower end passes through the bottom surface of the water holding chamber (21) 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 of the air plate pipe (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 fiber aeration disc (7) on the bottom surface of the water-containing cavity (21).

9. An aeration method using the suspended bubble aeration device as described in 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) draws water from the external water pool into the water tank through the water inlet pipe (4), and a first water surface is formed inside the water tank; Water from the external pool enters the guide pipe (5) through the lower port of the guide pipe (5) to form a second water surface; the membrane fiber (8) is positioned below the second water surface; the first water surface is higher than the second water surface, and water in the water tank flows downward into the guide pipe (5) through the membrane fiber aeration disc (7), generating a water flow velocity (V1), and the water above in the guide pipe (5) moves downward; The pores in the membrane filament (8) aerate the water below the second water surface, generating bubbles. The bubbles generate buoyancy, causing the bubbles to move upward and rise. According to Stokes' law, the rising speed of the bubble in the water is proportional to the square of the bubble diameter. The smaller the bubble, the slower the rising speed. The rising speed of a bubble with diameter R in the water is (V2). When the water flow velocity (V1) is equal to the buoyancy velocity (V2), the bubbles emitted from the pores of the membrane fiber (8) are suspended in the water; When the water flow velocity (V1) is greater than the buoyancy velocity (V2), the bubbles that are released from the pores of the membrane fiber (8) move downward with the water flow in the guide tube (5), and then flow out from the lower end of the guide tube (5) before floating upward. The movement of the bubble in the water is controlled by adjusting the water flow rate (V1) or the buoyancy rate (V2); 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 buoyancy velocity (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); Bubble volume is inversely proportional to pressure; Where p is pressure, V is volume, n is amount of substance, R is gas constant, and T is thermodynamic temperature; The water pressure on the bubble in the guide tube (5) will gradually increase as the bubble moves downward, and the volume of the bubble will gradually decrease; when the pressure reaches a certain value, the gas in the bubble-water transfer will dissolve into the water through the gas-liquid interface. The dissolution state of the bubbles can be controlled by adjusting the diameter or pressure of the bubbles amplified by the pores. 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.

Images