High-efficiency aeration device for sewage treatment

Abstract

The invention discloses a high-efficiency aeration device for sewage treatment, and belongs to the technical field of sewage treatment equipment.The high-efficiency aeration device comprises an aeration tank, an aeration mechanism and a liquid pushing mechanism, a guide cylinder extending from top to bottom is arranged in the aeration tank, a guide inlet is formed in the top of the guide cylinder, and a guide outlet is formed in the bottom of the guide cylinder; the aeration mechanism comprises the following structures: an aeration fan, the aeration fan is fixedly connected with the outer surface of the aeration tank, the output end of the aeration fan is provided with an aeration pipe extending into the guide cylinder, and the end part of the aeration pipe is provided with a plurality of aeration holes in the guide cylinder; the liquid pushing mechanism is located on the inner side of the flow guide outlet and composed of a driving motor at the top and a propeller arranged at the output end of the driving motor, and the driving motor drives the propeller to rotate so that sewage in the flow guide cylinder can flow downwards; the aeration efficiency in the aeration process is improved by enabling bubbles to be in full contact with sewage.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment equipment, and particularly relates to a high-efficiency aeration device for sewage treatment. Background Art

[0002] Sewage treatment is an important link in realizing the sustainable development of water resources. After removing pollutants from sewage, clean water is obtained and discharged into natural water bodies, avoiding the pollution of natural water bodies by pollutants in the sewage and playing a role in protecting the ecological environment. Sewage treatment usually includes operations such as impurity removal, sedimentation, microbial degradation, and filtration. Among them, the microbial degradation process is relatively crucial. This process can effectively remove pollutants such as organic matter in the sewage. In the microbial degradation process, aerobic microorganisms are usually required to participate in the decomposition reaction of pollutants, and through operations such as aeration, sufficient oxygen is provided for the microorganisms, which is beneficial to improving the efficiency of sewage treatment. However, at present, some sewage treatment aeration tanks simply inject air into the sewage through an aeration fan to increase the dissolved oxygen in the sewage, or use a surface aerator to lift and throw out the sewage based on the rotation of the paddle blades to form a water curtain and entrain air to achieve an increase in the dissolved oxygen in the sewage. However, in these ways of increasing the dissolved oxygen in the sewage, the contact efficiency between air and sewage is relatively low, resulting in a relatively low efficiency of sewage aeration.

[0003] Based on the above situation, Chinese Patent Publication No. CN112028267A discloses a sewage aeration tank, which includes an aeration tank. A placement rack is provided at the top of the aeration tank. A motor and a rotating blade are provided inside the placement rack. A vibrating plate is provided inside the aeration tank, and a plurality of through holes are formed on the surface of the vibrating plate. An air supply pipe is arranged inside the aeration tank and at the bottom of the vibrating plate. A plurality of one-way air outlet valves are arranged on the surface of the air supply pipe. The air supply pipe penetrates through one side surface of the aeration tank, and a blower is arranged on one side surface of the air supply pipe outside the aeration tank.

[0004] The above patent document discloses an aeration tank that improves the dissolved oxygen in sewage by driving a rotating blade to beat the sewage by a motor and injecting air into the sewage by a blower. In this aeration tank, although driving the rotating blade to beat the sewage by the motor can promote the contact between the sewage and air and promote the flow of the sewage in the aeration tank, the acting range of the rotating blade on the sewage is relatively low. In addition, the blower injects air into the sewage in the form of bubbles through the air supply pipe, and the bubbles will quickly float to the water surface, resulting in a short contact time between the bubbles and the sewage, so that the air in the bubbles is difficult to be efficiently dissolved in the sewage. It can be seen that both ways of promoting the dissolved oxygen in sewage in this aeration tank have the defect of low efficiency, so there is still room for improvement in this aeration tank. Summary of the Invention

[0005] In view of the technical defects existing in the background art, the present invention proposes a high-efficiency aeration device for sewage treatment, which solves the above technical problems and meets the actual needs. The specific technical solutions are as follows: A high-efficiency aeration device for sewage treatment, comprising an aeration tank, an aeration mechanism, and a liquid pushing mechanism. The inside of the aeration tank is hollow and there is an aeration tank opening at the top. A draft tube extending downward from top to bottom is provided inside the aeration tank. A draft inlet is opened at the top of the draft tube and a draft outlet is opened at the bottom; The aeration mechanism includes the following structure: an aeration fan, which is fixedly connected to the outer surface of the aeration tank. An air supply pipe extending into the draft tube is provided at the output end of the aeration fan. An aeration assembly is provided at the end of the air supply pipe inside the draft tube. A number of aeration holes are opened on the surface of the aeration assembly; The liquid pushing mechanism is located inside the draft outlet. The liquid pushing mechanism consists of a driving motor at the top and a propeller provided at the output end of the driving motor. The driving motor drives the propeller to rotate, causing the sewage inside the draft tube to flow downward.

[0006] As a further technical solution of the present invention, the aeration assembly is composed of a number of aeration branch pipes communicated with the air supply pipe. The number of the aeration branch pipes is arranged in an array with the end of the air supply pipe as the center. One end of each aeration branch pipe extends toward the inner wall of the draft tube; A number of the aeration holes are opened on the surfaces of the number of aeration branch pipes.

[0007] As a further technical solution of the present invention, the inner wall of the draft tube extends obliquely downward along the edge of the aeration assembly. The inner diameter of the draft inlet in the draft tube is larger than that of the draft outlet. The inner diameter of the draft tube gradually decreases from top to bottom.

[0008] As a further technical solution of the present invention, the draft inlet at the top of the draft tube is located below the aeration tank opening. A water inlet pipe is provided on one side at the top of the aeration tank opening. A water decanter is provided on one side of the inner wall of the aeration tank. A water outlet pipe extending outward after passing through the aeration tank is provided at the end of the water decanter.

[0009] As a further technical solution of the present invention, a number of fixing connecting rods extending toward the inner wall of the aeration tank are provided outside the draft tube. The ends of the fixing connecting rods are fixedly connected to the inner wall of the aeration tank.

[0010] As a further technical solution of the present invention, a baffle is provided on one side of the fixing connecting rod. The width direction of the baffle extends along the fixing connecting rod, and the length direction extends obliquely upward toward the aeration tank opening. A draft space is formed between every two adjacent baffles.

[0011] As a further technical solution of the present invention, a number of through holes are penetrated through the surface of the baffle. The through holes communicate the adjacent two draft spaces with each other.

[0012] As a further technical solution of the present invention, at least one surface aerator is provided at the top of the aeration tank. The surface aerator is composed of an aeration motor and an aeration impeller. The aeration motor is fixedly connected to the aeration tank and is arranged at the top of the aeration tank opening. The aeration impeller is arranged at the bottom of the aeration motor and is located inside the aeration tank; The aeration impeller is convex downward to form a conical protrusion, and several stirring edges are provided on the surface of the conical protrusion.

[0013] As a further technical solution of the present invention, a downwardly concave reflux groove is provided at the bottom of the aeration tank, and the position where the reflux groove is arranged is matched with the propeller.

[0014] The beneficial effects of the present invention are as follows: The present invention discloses an aeration device that can improve the aeration efficiency during the sewage treatment process. The aeration device mainly performs aeration operation on sewage by generating air flow through an aeration fan and forming small bubbles in the sewage through aeration holes. During the aeration process of the sewage, the propeller is rotated by a driving motor, so that the sewage moves downward from top to bottom along the inside of the draft tube and then moves upward along the space between the outside of the draft tube and the aeration tank. During the process of the sewage forming a circulating flow in the aeration tank, small bubbles are carried along the water flow direction, so that the small bubbles will not move upward under the action of buoyancy after entering the sewage, which can increase the contact time between the small bubbles and the sewage, thereby improving the aeration efficiency during the aeration process. Brief Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of a high-efficiency aeration device for sewage treatment.

[0016] Figure 2 is a cross-section of a high-efficiency aeration device for sewage treatment Figure 1 .

[0017] Figure 3 is a cross-section of a high-efficiency aeration device for sewage treatment Figure 2 .

[0018] Figure 4 is a cross-section of a high-efficiency aeration device for sewage treatment Figure 3 .

[0019] Figure 5 is a main cross-sectional view of a high-efficiency aeration device for sewage treatment.

[0020] Figure 6 is a schematic diagram of the sewage flow direction in a high-efficiency aeration device for sewage treatment.

[0021] Figure 7 isFigure 4 Partial schematic diagram at location A in

[0022] Wherein: 1 - Aeration tank, 11 - Inlet pipe, 12 - Return flow tank, 2 - Aeration mechanism, 21 - Aeration blower, 22 - Aeration pipe, 23 - Aeration branch pipe, 3 - Liquid pushing mechanism, 31 - Driving motor, 32 - Propeller, 4 - Draft tube, 41 - Draft inlet, 42 - Draft outlet, 43 - Fixed connecting rod, 5 - Draft board, 51 - Through hole, 6 - Surface aerator, 61 - Aeration motor, 62 - Aeration impeller, 63 - Conical protrusion, 64 - Stirring edge, 7 - Decanter, 71 - Outlet pipe. Specific implementation mode

[0023] The following combines relevant attached drawings and embodiments to illustrate the implementation mode of the present invention. The implementation mode of the present invention is not limited to the following embodiments, and the relevant necessary components involved in the present invention should be regarded as well-known technologies in the technical field, which can be known and mastered by those skilled in the technical field.

[0024] Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , a high-efficiency aeration device for sewage treatment, comprising an aeration tank 1, an aeration mechanism 2, and a liquid pushing mechanism 3. The inside of the aeration tank 1 is hollow and there is an aeration tank opening at the top. A draft tube 4 extending from top to bottom is provided inside the aeration tank 1. A draft inlet 41 is opened at the top of the draft tube 4 and a draft outlet 42 is opened at the bottom; the aeration mechanism 2 includes the following structures: an aeration blower 21, which is fixedly connected to the outer surface of the aeration tank 1. The output end of the aeration blower 21 is provided with an aeration pipe 22 extending into the draft tube 4. An aeration component is provided at the end of the aeration pipe 22 inside the draft tube 4, and a number of aeration holes are opened on the surface of the aeration component; the liquid pushing mechanism 3 is located inside the draft outlet 42 and is composed of a driving motor 31 at the top and a propeller 32 provided at the output end of the driving motor 31. The driving motor 31 drives the propeller 32 to rotate, causing the sewage inside the draft tube 4 to flow downward.

[0025] The present invention discloses an aeration device that can improve the aeration efficiency during the sewage treatment process. The aeration device of the present invention is based on the SBR process. Activated sludge is deposited at the bottom of the aeration tank 1. Sewage enters the aeration tank 1 in batches, and then the aeration mechanism 2 blows air through the aeration blower 21 to form an air flow flowing along the aeration pipe 22. The air flows in the aeration pipe 22 to the aeration component and then passes through a number of aeration holes. The air enters the sewage in the state of a large number of small bubbles through the aeration holes. The large number of small bubbles can improve the contact efficiency with the sewage through a larger specific surface area, thereby improving the efficiency of oxygen dissolved in the sewage in the small bubbles.

[0026] In addition, the aeration component is arranged at the top of the draft tube 4 near the draft inlet 41. After the small bubbles leave the aeration component, they will enter the sewage in the draft tube 4. During the process of aerating the sewage, the liquid pushing mechanism 3 needs to operate synchronously. In the liquid pushing mechanism 3, the driving motor 31 is preferably a submersible motor. The driving motor 31 is connected to the external power supply line through a waterproof wire, and the external power supply line provides the electric energy required for the operation of the driving motor 31. During the operation of the liquid pushing mechanism 3, the driving motor 31 drives the propeller 32 to rotate, and the rotating propeller 32 pushes the water flow inside the draft tube 4 to move downward from top to bottom. And a reflux groove 12 that is recessed downward and arc-shaped is arranged at the bottom of the aeration tank 1. The position where the reflux groove 12 is arranged matches that of the propeller 32. The sewage at the top of the aeration tank 1 flows from the draft inlet 41 along the inside of the draft tube 4 to the draft outlet 42, and then flows upward from the reflux groove 12 at the bottom of the aeration tank 1 along the outside of the draft tube 4 and between the aeration tank 1 to a position near the aeration tank opening at the top of the aeration tank 1. The sewage forms the above-mentioned circulating flow mode in the aeration tank 1, avoiding the formation of dead zones in the aeration tank 1 and being beneficial to improving the uniformity of the mixing of sewage and activated sludge.

[0027] It should be noted that after the small bubbles are discharged from the air holes of the aeration component into the sewage, due to the downward flow of the sewage inside the draft tube 4, the thrust generated by the sewage flow will offset the buoyancy force received by the small bubbles, causing some small bubbles to move downward with the sewage to the draft outlet 42. Then these small bubbles are dispersed at the position between the edge of the draft outlet 42 and the aeration tank 1 under the agitation of the propeller 32 and flow upward with the sewage; based on the above situation, after the small bubbles are discharged from the aeration component into the sewage, they will first move downward along the draft tube 4. When the small bubbles move to the draft outlet 42, they will move upward along the position between the outside of the draft tube 4 and the aeration tank 1 until they move to the sewage water surface and mix with the outside air, forming a unique movement path of the small bubbles in the sewage.

[0028] In the currently commonly used aeration equipment for sewage treatment, the small bubbles generated during the aeration process usually directly move upward to the sewage water surface under the action of buoyancy after being discharged from the bottom of the sewage. The movement path of the small bubbles in the sewage is short and the contact time with the sewage is also short, resulting in a low efficiency of dissolving oxygen in the sewage by the small bubbles and a low aeration efficiency; while in the present invention, based on the movement path of the small bubbles in the sewage of the aeration tank 1, the movement path of the small bubbles in the sewage is long, which is beneficial to prolonging the contact time between the small bubbles and the sewage, enabling more oxygen in the small bubbles to be dissolved in the sewage, thereby improving the aeration efficiency.

[0029] It should be further noted that since the small bubbles are always affected by buoyancy in the sewage, during the downward movement of the small bubbles in the draft tube 4, the buoyancy will offset part of the thrust generated by the sewage flow, making the downward movement speed of the small bubbles lower than the downward flow speed of the sewage. This can prevent the small bubbles from moving too fast to the draft outlet 42 and moving upward with the water flow, thus ensuring sufficient contact time between the small bubbles and the sewage, improving the dissolved oxygen content and dissolved oxygen efficiency of the sewage. Additionally, when the oxygen in the small bubbles gradually dissolves in the sewage, the size of the small bubbles will shrink, reducing the buoyancy they receive. At this time, the movement speed of the small bubbles along with the sewage flow will increase, enabling them to move to the sewage surface faster. Larger-sized small bubbles still maintain a lower movement speed and can have more sufficient contact with the sewage. Based on this situation, since the oxygen content in smaller-sized small bubbles is lower, the efficiency of oxygen dissolution in the sewage is also reduced. The faster movement speed can accelerate the speed at which small-sized small bubbles are discharged above the sewage surface. Larger-sized small bubbles have a higher oxygen content and a larger specific surface area, enabling oxygen to maintain a higher dissolution efficiency. The slower discharge speed of these larger-sized small bubbles above the sewage surface allows for more sufficient contact between the larger-sized small bubbles and the sewage, and can also improve the dissolved oxygen content and dissolved oxygen efficiency of the sewage.

[0030] Moreover, during the aeration process, by controlling the output power of the drive motor 31 to adjust the rotation speed of the propeller 32, the downward movement speed of the sewage in the draft tube 4 and the thrust generated on the small bubbles can be regulated. Based on this regulation, the movement time of small bubbles in the sewage can be dynamically adjusted according to the sizes of different small bubbles, which is beneficial to ensuring that the oxygen in the small bubbles can always be efficiently dissolved in the sewage, thereby ensuring the efficient operation of the aeration device.

[0031] As one of the preferred embodiments of the present invention, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6, the aeration assembly is composed of a number of aeration branch pipes 23 communicated with the aeration pipe 22. The number of aeration branch pipes 23 is distributed in an array centered on the end of the aeration pipe 22. One end of the aeration branch pipe 23 extends towards the inner wall of the draft tube 4, and a number of aeration holes are opened on the surface of the number of aeration branch pipes 23. The aeration holes are preferably arranged at the bottom of the aeration branch pipe 23. After adopting this structure, the air flow generated by the aeration fan 21 is dispersed from the end of the aeration pipe 22 into a number of aeration branch pipes 23. Since the number of aeration branch pipes 23 is distributed in an array along the end of the aeration pipe 22, the small bubbles formed by the air flow discharged through the aeration holes on the surface of the aeration pipe 22 will be evenly dispersed inside the draft tube 4, so that the small bubbles are evenly dispersed in the sewage after being mixed with the sewage flow. When the aeration holes are arranged at the bottom of the aeration branch pipe 23, the small bubbles will have an initial downward velocity after being generated from the bottom of the aeration branch pipe 23, avoiding the small bubbles from quickly floating up to the sewage surface after leaving the aeration holes and entering the sewage. Thus, more small bubbles move downward with the sewage flow. After appropriately adjusting the flow velocity of the sewage in the draft tube 4 through the liquid pushing mechanism 3, most or all of the small bubbles can move downward with the sewage flow, which is beneficial to prolong the contact time between the small bubbles and the sewage, thereby improving the dissolved oxygen amount and dissolved oxygen efficiency of the sewage.

[0032] As one of the preferred embodiments of the present invention, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , the inner wall of the draft tube 4 extends obliquely downward along the edge of the aeration assembly. The inner diameter of the diversion inlet 41 in the draft tube 4 is larger than the inner diameter of the diversion outlet 42. The inner diameter of the draft tube 4 gradually decreases from top to bottom. After adopting this structure, the flow velocity of the sewage flowing downward in the draft tube 4 will become faster and faster. Similarly, the greater the thrust of the sewage flow on the small bubbles near the position of the diversion outlet 42 at the bottom of the draft tube 4. Since the small bubbles continuously dissolve oxygen in the sewage during the downward movement in the sewage after leaving the aeration holes, as the small bubbles get closer and closer to the diversion outlet 42, the oxygen content inside them will be lower. And the position of the draft tube 4 near the diversion outlet 42 can make the small bubbles in this position move faster to the space between the outside of the draft tube 4 and the aeration tank 1 through a faster water flow velocity, so that these small bubbles can escape from the sewage surface into the environment faster.

[0033] It should be noted that if the small bubbles fuse with each other inside the draft tube 4, they may move upward inside the draft tube 4 due to greater buoyancy, which may further cause more small bubbles to fuse with each other and form a chain reaction. This situation is not conducive to the dissolution of oxygen in the sewage. Based on the above principle of accelerating the dissipation speed of small bubbles with low oxygen content, it is possible to avoid the accumulation of too many small bubbles inside the draft tube 4 and the situation of small bubbles fusing with each other, thereby ensuring the normal downward movement of small bubbles inside the draft tube 4. By extending the contact time between small bubbles and sewage, the dissolved oxygen content of the sewage is increased, so that most of the oxygen in the small bubbles generated during the aeration process can be dissolved in the sewage, thereby improving the aeration efficiency during the aeration process.

[0034] As one of the preferred embodiments of the present invention, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 , the diversion inlet 41 at the top of the draft tube 4 is located below the aeration tank opening. One side of the top of the aeration tank opening is provided with a water inlet pipe 11. One side of the inner wall of the aeration tank 1 is provided with a weir 7. The weir 7 is preferably a self-floating weir. The end of the weir 7 is provided with an outlet pipe 71 that penetrates through the aeration tank 1 and extends outward. The water outlet end of the weir 7 is connected to the outlet pipe 71. A valve for controlling the communication between the weir 7 and the outlet pipe 71 or the closing of the outlet pipe 71 is provided at the connection between the weir 7 and the outlet pipe 71.

[0035] After adopting the above structure, the sewage to be treated is pumped through the water inlet pipe 11 and transported into the aeration tank 1, and the water surface of the sewage in the aeration tank 1 needs to be above the diversion inlet 41 so that the sewage can enter the inside of the draft tube 4 through the diversion inlet 41 for circulation. When a batch of sewage is aerated and treated in the aeration tank 1, the treated sewage is made to flow along the weir 7 into the outlet pipe 71 by opening the valve, and the outlet pipe 71 is connected to the equipment of the next sewage treatment process. The outlet pipe 71 diverts the sewage to the next process for continuous treatment.

[0036] As one of the preferred embodiments of the present invention, referring to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 , a number of fixed connecting rods 43 extending towards the inner wall of the aeration tank 1 are provided on the outside of the draft tube 4. The ends of the fixed connecting rods 43 are fixedly connected to the inner wall of the aeration tank 1. The draft tube 4 is fixedly connected to the aeration tank 1 through the fixed connecting rods 43; a deflector 5 is provided on one side of the fixed connecting rod 43. The width direction of the deflector 5 extends along the fixed connecting rod 43, and the length direction inclines upward towards the aeration tank opening. A diversion space is formed between every two adjacent deflectors 5.

[0037] After adopting the above structure, during the upward flow of the sewage water along the outside of the draft tube 4 and between the aeration tank 1, the baffle 5 can make the sewage flow obliquely upward along the diversion space, so that the sewage forms a swirling flow in the aeration tank 1. The swirling flow can better lift the activated sludge deposited at the bottom of the aeration tank 1, so that the sewage can be fully contacted with the activated sludge, which is beneficial to improving the effect of microorganisms in the activated sludge degrading pollutants in the sewage.

[0038] As one of the preferred embodiments of the present invention, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , a plurality of through holes 51 penetrate through the surface of the baffle 5. The through holes 51 communicate adjacent two diversion spaces with each other. During the upward flow of the sewage in the diversion space, part of the sewage will flow obliquely upward along the bottom of the baffle 5 under the diversion action of the baffle 5. At this time, the water flow in contact with the bottom of the baffle 5 can flow into the interior of the adjacent diversion space through the through holes 51, which can generate a turbulent flow effect on the sewage water flow inside the diversion space. This turbulent flow effect can play a certain stirring effect on the sewage water flow, which is beneficial to improving the mixing uniformity of the sewage and the activated sludge.

[0039] As one of the preferred embodiments of the present invention, referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , at least one surface aerator 6 is provided at the top of the aeration tank 1. The surface aerator 6 is composed of an aeration motor 61 and an aeration impeller 62. The aeration motor 61 is fixedly connected to the aeration tank 1 and is arranged at the top of the aeration tank opening. The aeration impeller 62 is arranged at the bottom of the aeration motor 61 and is located inside the aeration tank 1; the aeration impeller 62 is convex downward and forms a conical protrusion 63, and a plurality of stirring edges 64 are arranged on the surface of the conical protrusion 63.

[0040] After adopting the above structure, the surface aerator 6 is mainly used to enhance the dissolved oxygen content of the sewage. The aeration motor 61 is connected to the external power supply line through a waterproof wire, and the external power supply line provides the electric energy required for the operation of the aeration motor 61. The aeration motor 61 drives the aeration impeller 62 to rotate. The rotating aeration impeller 62 throws the sewage on the surface of the aeration tank 1 into thin sheets or water droplets through the stirring edges 64, so that the sewage contacts with the air and dissolves oxygen during the flight; in addition, the direction of rotation of the aeration motor 61 driving the aeration impeller 62 matches the upward inclination direction of the baffle 5, so that the flowing direction of the swirling flow formed by the sewage matches the direction of rotation of the aeration impeller 62. During the rotation of the aeration impeller 62, it can ensure that the flowing direction of the sewage on the surface of the aeration tank 1 is the same as that of the swirling flow, thereby improving the stability of the sewage during the circulating flow in the aeration tank 1.

[0041] In summary, the present invention discloses an aeration device that can improve the aeration efficiency during the sewage treatment process. The aeration device mainly performs aeration operation on sewage by generating air flow through the aeration fan 21 and forming small bubbles in the sewage through the aeration holes. During the aeration process of the sewage, the driving motor 31 drives the propeller 32 to rotate, causing the sewage to move downward from top to bottom along the inside of the draft tube 4 and then move upward along the space between the outside of the draft tube 4 and the aeration tank 1. During the process of the sewage forming a circulating flow in the aeration tank 1, the small bubbles are carried along the water flow direction, so that the small bubbles will not move upward under the action of buoyancy after entering the sewage, which can increase the contact time between the small bubbles and the sewage, thereby improving the aeration efficiency during the aeration process.

[0042] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A high-efficiency aeration device for sewage treatment, comprising an aeration tank (1), an aeration mechanism (2), and a liquid pushing mechanism (3), characterized in that: The aeration tank (1) is hollow inside and has an aeration tank opening at the top. A flow guide tube (4) extending from top to bottom is provided inside the aeration tank (1). The flow guide tube (4) has a flow guide inlet (41) at the top and a flow guide outlet (42) at the bottom. The aeration mechanism (2) comprises the following structures: an aeration fan (21), the aeration fan (21) being fixedly connected to the outer surface of the aeration tank (1), the output end of the aeration fan (21) being provided with an aeration pipe (22) extending to the inside of the guide tube (4), the end of the aeration pipe (22) being provided with an aeration component inside the guide tube (4), the surface of the aeration component being provided with a plurality of aeration holes; The liquid pushing mechanism (3) is located inside the diversion outlet (42), and is composed of a driving motor (31) at the top and a propeller (32) arranged at the output end of the driving motor (31). The driving motor (31) drives the propeller (32) to rotate so that the sewage inside the diversion tube (4) flows downward.

2. The high-efficiency aeration device for sewage treatment according to claim 1, characterized in that: The aeration assembly is composed of a plurality of aeration branch pipes (23) connected to the aeration pipe (22), wherein the plurality of aeration branch pipes (23) are distributed in an array with the end of the aeration pipe (22) as the center, and one end of the aeration branch pipe (23) extends toward the inner wall of the flow guide tube (4); The plurality of aeration holes are arranged on the surfaces of the plurality of aeration branch pipes (23).

3. The high-efficiency aeration device for sewage treatment according to claim 1, characterized in that: The inner wall of the flow guide tube (4) extends obliquely downward along the edge of the aeration assembly, the inner diameter of the flow guide inlet (41) in the flow guide tube (4) is larger than the inner diameter of the flow guide outlet (42), and the inner diameter of the flow guide tube (4) gradually decreases from top to bottom.

4. The high-efficiency aeration device for sewage treatment according to claim 1, characterized in that: The flow guide inlet (41) at the top of the flow guide tube (4) is located below the aeration tank opening, a water inlet pipe (11) is provided on one side of the top of the aeration tank opening, a decanter (7) is provided on one side of the inner wall of the aeration tank (1), and a water outlet pipe (71) is provided at the end of the decanter (7) and extends outward after penetrating the aeration tank (1).

5. The high-efficiency aeration device for sewage treatment according to claim 1, characterized in that: A plurality of fixed connecting rods (43) extending toward the inner wall of the aeration tank (1) are provided on the outer side of the guide tube (4), and the ends of the fixed connecting rods (43) are fixedly connected to the inner wall of the aeration tank (1).

6. The high-efficiency aeration device for sewage treatment according to claim 5, characterized in that: A guide plate (5) is provided on one side of the fixed connecting rod (43), the guide plate (5) extending along the fixed connecting rod (43) in the width direction and extending obliquely upwards towards the aeration tank opening in the length direction, and a guide space is formed between every two adjacent guide plates (5).

7. The high-efficiency aeration device for sewage treatment according to claim 6, characterized in that: A plurality of through holes (51) are formed through the surface of the guide plate (5), and the through holes (51) enable two adjacent guide spaces to communicate with each other.

8. The high-efficiency aeration device for sewage treatment according to claim 1, characterized in that: At least one surface aerator (6) is provided at the top of the aeration tank (1), and the surface aerator (6) is composed of an aeration motor (61) and an aeration impeller (62). The aeration motor (61) is fixedly connected to the aeration tank (1) and is provided at the top of the aeration tank opening. The aeration impeller (62) is provided at the bottom of the aeration motor (61) and is located inside the aeration tank (1). The aeration impeller (62) is convex downward to form a conical protrusion (63), and a plurality of stirring edges (64) are provided on the surface of the conical protrusion (63).

9. The high-efficiency aeration device for sewage treatment according to claim 1, characterized in that: A downwardly recessed reflux groove (12) is provided at the bottom of the aeration tank (1), and the reflux groove (12) is arranged at a position matching the propeller (32).

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