Continuous flow sewage treatment system based on aerobic granular sludge

Abstract

The invention discloses a continuous flow sewage treatment system based on aerobic granular sludge, and belongs to the technical field of sewage treatment. The sewage treatment system comprises a reaction tank, a sewage inlet pipe communicated with one side of the bottom of the reaction tank, a drainage pipe fixedly arranged at the top end of the reaction tank, and an aeration structure and a stirring structure which are arranged in the reaction tank, the sewage treatment system further comprises a turbofan which is rotatably arranged in one side, close to the reaction tank, of the sewage inlet pipe and is used for being impacted by sewage, and an air bag which is fixedly arranged on the inner side of the outlet end of the drainage pipe and is used for changing the size of an outlet of the drainage pipe. According to the continuous flow sewage treatment system based on the aerobic granular sludge, by arranging the turbofan, entering sewage can be dispersed so as to reduce direct impact on the aerobic granular sludge due to the fact that the flow speed of the sewage is too high, and meanwhile by arranging the transverse shaft and the reciprocating assembly, the flow speed of the sewage can be adjusted according to the flow speed of the sewage. Therefore, the duration of the sewage staying in the reaction tank is adjusted, and the sewage treatment effect is improved.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and specifically to a sewage treatment system based on aerobic granular sludge continuous flow. Background Art

[0002] With the acceleration of industrialization and the improvement of urbanization, the problem of sewage treatment is becoming increasingly serious. Sewage treatment is not only the basis for ensuring water resource security and ecological environment, but also a necessary measure for various emission standards. Although traditional sewage treatment methods, such as activated sludge method and oxidation ditch method, have achieved certain results in practical applications, they still face problems such as low treatment efficiency, high energy consumption, and poor operation stability.

[0003] Aerobic granular sludge technology is a new type of sewage treatment technology with high reaction rate, small sludge production, low energy consumption and good shock load resistance. Therefore, it has received extensive attention in the field of sewage treatment. In the aerobic granular sludge method, granular sludge exists in the reaction tank in the form of larger particles, and undergoes oxidation reaction with organic matter in the water to achieve the purpose of purifying water quality. Due to the good sedimentation performance of granular sludge, it can effectively remove pollutants in the water in a short time, greatly improving the treatment efficiency.

[0004] However, in the existing aerobic granular sludge sewage treatment system, sewage directly enters the reaction tank through a pipe to react with the aerobic granular sludge. When the sewage flows too fast, it will impact the aerobic granular sludge in the reaction tank, causing the sludge particles to disperse and break, reducing the stability of the sludge and the treatment effect. In addition, when the sewage flows too fast, the contact time between the sewage and the aerobic granular sludge is shortened, and the organic matter is not fully degraded, resulting in a decrease in the treatment effect.

[0005] Therefore, the present application provides a sewage treatment system based on aerobic granular sludge continuous flow to solve the above problems. Summary of the invention

[0006] The present application provides a continuous flow sewage treatment system based on aerobic granular sludge, which aims to solve the problems in the existing aerobic granular sludge sewage treatment system proposed in the background technology, that is, sewage directly entering the reaction tank at a high speed will impact the sludge, causing the sludge to disperse and break, shorten the contact time, and insufficiently degrade organic matter, thereby reducing the treatment effect.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a sewage treatment system based on aerobic granular sludge continuous flow, comprising a reaction tank, a sewage inlet pipe connected to one side of the bottom of the reaction tank, a drainage pipe fixedly arranged at the top of the reaction tank, and an aeration structure and a stirring structure arranged in the reaction tank;

[0008] The sewage treatment system also includes a turbofan rotatably arranged inside the sewage inlet pipe near the reaction tank for being impacted by sewage, an air bag fixedly arranged inside the outlet end of the drain pipe for changing the size of the drain pipe outlet, and a suction air structure arranged on one side of the reaction tank and connected to the turbofan and the air bag for repeatedly expanding and contracting the air bag;

[0009] The suction air structure includes a horizontal axis rotatably connected to the sewage inlet pipe and coaxially fixedly connected to the turbofan, an air cylinder member symmetrically arranged on the drain pipe and connected to the airbag for sucking air from the airbag, and a reciprocating assembly arranged outside the sewage inlet pipe and respectively connected to the two ends of the horizontal axis for transmitting the turbofan power to the two air cylinder members so that the two air cylinder members repeatedly suck air; through the arranged turbofan, when sewage enters the sewage inlet pipe, it will impact the turbofan and make it rotate, so that the incoming sewage can be dispersed through the rotation of the turbofan, so as to reduce the direct impact on the aerobic granular sludge caused by the excessively fast sewage flow rate, which is beneficial The stable and efficient operation of aerobic granular sludge can improve the effect of sewage treatment. At the same time, the dispersed sewage can contact the aerobic granular sludge more evenly, thereby increasing the contact area and reaction efficiency between the sewage and the sludge. In addition, through the set horizontal axis and reciprocating components, the rotational power of the turbofan can be converted into repeated expansion and contraction of the airbag, so that when the water flow is too fast or too slow, the frequency of the expansion and contraction of the airbag can be adjusted to change the frequency of the reduction of the drain pipe outlet, and then the length of time the sewage stays in the reaction tank can be adjusted according to the speed of the sewage flow, so as to ensure the contact reaction time between the sewage and the aerobic granular sludge, and further improve the effect of sewage treatment.

[0010] Preferably, in order to facilitate drainage, the drain pipe includes a filter plate fixedly arranged at the top of the reaction tank, a sealing cover fixedly arranged at the top of the filter plate, and a drain port opened on one side of the sealing cover, and the airbag is fixedly arranged on the inside of the drain port; such a design facilitates effective filtration and drainage of sewage.

[0011] Preferably, in order to facilitate the transmission of turbofan power to the two air cylinder parts, the reciprocating assembly includes a transmission bevel gear arranged on the outside of the sewage inlet pipe and fixedly sleeved with the end of the transverse axis, a connecting gear rotatably arranged on the transmission bevel gear away from the end of the transverse axis and meshing with the transmission bevel gear, a connecting shaft rotatably connected to the side of the reaction tank away from the drain outlet and fixedly connected to the connecting gear, a rotor fixedly connected to the top of the connecting shaft and located at the top of the sealing cover, an eccentric shaft fixedly connected to the rotor, and a connecting rod rotatably connected to the top of the eccentric shaft and connected to the air cylinder part; through the coordinated action of the transmission bevel gear, the connecting gear, the connecting shaft, the rotor, the eccentric shaft and the connecting rod, a smooth power transmission from the turbofan to the air cylinder part is achieved, so that the airbag can stably expand and contract repeatedly.

[0012] Preferably, in order to facilitate the repeated expansion and contraction of the airbag, the air cylinder component includes a cylinder fixedly arranged at the top of the sealing cover, a piston that moves laterally in the cylinder, a push rod that laterally penetrates the cylinder near one end of the connecting rod and is fixedly connected to the piston, and a connecting tube that is fixedly arranged at one end of the cylinder away from the push rod and connected to the cylinder and the airbag. The push rod is slidably connected to the cylinder, and the push rod is rotatably connected to the end of the connecting rod away from the eccentric shaft. This design allows the push rod to repeatedly push the piston to achieve repeated degassing and inhalation of the airbag.

[0013] Preferably, in order to improve the protection of components such as the sewage inlet pipe, transmission bevel gear, transmission bevel gear and connecting shaft, a protection box is fixedly connected to the side of the reaction tank corresponding to the sewage inlet pipe, and the protection box cover is arranged on the outside of the sewage inlet pipe, transmission bevel gear, transmission bevel gear and connecting shaft, and the top end of the connecting shaft passes through the protection box and is rotatably connected to the protection box; such a design helps to reduce damage to components caused by external environmental factors and extend the service life of the equipment.

[0014] Preferably, in order to achieve aeration, the aeration structure includes a fixed pipe fixedly installed at the bottom end of the reaction tank, an aerator fixedly connected to the fixed pipe and distributed in a linear array, an air inlet pipe running through the reaction tank on a side corresponding to the drain pipe and connected to the fixed pipe, and a fan arranged on the outside of the reaction tank and connected to the air inlet pipe, wherein the air inlet pipe is fixedly connected to the reaction tank; through the fixed pipe, the aerator, the air inlet pipe and the fan, uniform and sufficient aeration is ensured in the reaction tank, which helps the aerobic granular sludge to fully contact and react with the pollutants in the sewage, thereby improving the sewage treatment effect.

[0015] Preferably, in order to ensure the reaction contact between aerobic granular sludge and sewage, the stirring structure includes a stirring shaft rotatably arranged in the reaction tank at a position corresponding to the top of the air inlet pipe and a stirring blade arranged in the reaction tank and fixedly connected to the stirring shaft; the stirring shaft and the stirring blade can ensure that the aerobic granular sludge and sewage are fully mixed and contacted in the reaction tank.

[0016] Preferably, in order to reduce energy consumption, the sewage treatment system also includes a transmission belt structure connected to the agitator shaft and the fan for transmitting the fan power to the agitator shaft; the fan power is transmitted to the agitator shaft through the transmission belt structure, thereby achieving effective energy utilization and energy saving and consumption reduction.

[0017] Preferably, in order to facilitate the transmission of the fan power to the stirring shaft, the transmission belt structure includes a fixed plate fixedly arranged on the reaction tank, a transmission shaft coaxially fixedly connected to the air inlet pipe fan blades, transmission wheels respectively fixedly sleeved on the transmission shaft and the top of the stirring shaft, and a transmission belt arranged on the two transmission wheels. The transmission shaft and the top of the stirring shaft are both rotatably connected to the fixed plate, and the two transmission wheels are connected and transmit power through the transmission belt; through the synergistic effect of the transmission shaft, the transmission wheel and the transmission belt, efficient power transmission from the fan to the stirring shaft is achieved. This design can ensure that the power generated by the fan can be fully and stably transmitted to the stirring shaft, thereby driving the stirring blades to perform efficient stirring operations.

[0018] The aerobic granular sludge continuous flow sewage treatment system is provided with a turbofan. When sewage enters the sewage inlet pipe, it will impact the turbofan and make it rotate. Thus, the incoming sewage can be dispersed through the rotation of the turbofan, so as to reduce the direct impact on the aerobic granular sludge caused by the excessively fast sewage flow rate, which is beneficial to the stable and efficient operation of the aerobic granular sludge and improves the sewage treatment effect. At the same time, the dispersed sewage can contact the aerobic granular sludge more evenly, thereby increasing the contact area and reaction efficiency between the sewage and the sludge.

[0019] The aerobic granular sludge continuous flow sewage treatment system can convert the rotational power of the turbofan into repeated expansion and contraction of the airbag by setting the horizontal axis and reciprocating components, so that when the water flow is too fast or too slow, the frequency of the expansion and contraction of the airbag can be adjusted to change the frequency of the reduction of the drain pipe outlet, and then the length of time the sewage stays in the reaction tank can be adjusted according to the speed of the sewage flow, so as to ensure the contact reaction time between the sewage and the aerobic granular sludge, and further improve the sewage treatment effect;

[0020] The aerobic granular sludge continuous flow sewage treatment system can ensure that the power generated by the fan can be fully and stably transmitted to the stirring shaft through the transmission belt structure, thereby driving the stirring blades to perform efficient stirring operations and reduce energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of a sewage treatment system based on aerobic granular sludge continuous flow Figure 1 ;

[0022] Figure 2 It is a schematic diagram of the internal structure of a sewage treatment system based on aerobic granular sludge continuous flow;

[0023] Figure 3 A schematic diagram of the structure of a sewage treatment system based on aerobic granular sludge continuous flow Figure 2 ;

[0024] Figure 4 It is a schematic diagram of a suction structure in a sewage treatment system based on aerobic granular sludge continuous flow;

[0025] Figure 5 It is a cross-sectional view of an air suction structure in a sewage treatment system based on aerobic granular sludge continuous flow;

[0026] Figure 6 It is a schematic diagram of a transmission belt structure in a sewage treatment system based on aerobic granular sludge continuous flow;

[0027] Figure 7 It is a cross-sectional view of a stirring structure in a sewage treatment system based on aerobic granular sludge continuous flow.

[0028] In the figure:

[0029] 1. Reaction pool; 11. Protection box;

[0030] 2. Sewage inlet pipe;

[0031] 3. Drain pipe; 31. Filter plate; 32. Sealing cover; 33. Drain port;

[0032] 4. Aeration structure; 41. Fixed pipe; 42. Aerator; 43. Air inlet pipe; 44. Fan;

[0033] 5. stirring structure; 51. stirring shaft; 52. stirring blade;

[0034] 6. Turbofan;

[0035] 7. Airbag;

[0036] 8. Suction structure; 81. Horizontal axis; 82. Reciprocating assembly; 821. Transmission bevel gear; 822. Connecting gear; 823. Connecting shaft; 824. Rotating wheel; 825. Eccentric shaft; 826. Connecting rod; 83. Cylinder piece; 831. Cylinder body; 832. Push rod; 833. Piston; 834. Connecting pipe;

[0037] 9. Transmission belt structure; 91. Fixed plate; 92. Transmission shaft; 93. Transmission wheel; 94. Transmission belt. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] Example 1

[0040] This embodiment provides a sewage treatment system based on aerobic granular sludge continuous flow, such as Figure 1-Figure 7 As shown, the sewage treatment system includes a reaction tank 1, a sewage inlet pipe 2 connected to one side of the bottom of the reaction tank 1, a drainage pipe 3 fixedly arranged at the top of the reaction tank 1, an aeration structure 4 and a stirring structure 5 arranged in the reaction tank 1; the sewage treatment system also includes a turbofan 6 rotatably arranged inside the sewage inlet pipe 2 near the reaction tank 1 for being impacted by sewage, an air bag 7 fixedly arranged inside the outlet end of the drainage pipe 3 for changing the outlet size of the drainage pipe 3, and a suction air structure 8 arranged at one side of the reaction tank 1 and connected to the turbofan 6 and the air bag 7 for repeatedly expanding and contracting the air bag 7; the suction air structure 8 includes a horizontal axis 81 rotatably connected to the sewage inlet pipe 2 and coaxially fixedly connected to the turbofan 6, an air cylinder member 83 symmetrically arranged on the drainage pipe 3 and connected to the air bag 7 for sucking air from the air bag 7, and a reciprocating assembly 82 arranged outside the sewage inlet pipe 2 and respectively connected to both ends of the horizontal axis 81 for transmitting the power of the turbofan 6 to the two air cylinder members 83 so that the two air cylinder members 83 repeatedly suck air.

[0041] Among them, in order to achieve drainage, the drain pipe 3 includes a filter plate 31 fixedly arranged at the top of the reaction tank 1, a sealing cover 32 fixedly arranged at the top of the filter plate 31, and a drain port 33 opened on one side of the sealing cover 32, and the air bag 7 is fixedly arranged on the inner side of the drain port 33; when the sewage after reacting with the aerobic granular sludge above the reaction tank 1 reaches the position of the drain pipe 3, it will be filtered by the filter plate 31 to reduce part of the aerobic granular sludge and sewage dirt and be discharged from the drain port 33 to the next process.

[0042] During use, when sewage enters the reaction tank 1 through the sewage inlet pipe 2 and reacts with the aerobic granular sludge, the aeration structure 4 will provide oxygen to the reaction tank 1 to maintain the activity of aerobic microorganisms. At the same time, the stirring structure 5 will promote the full mixing of sewage and aerobic granular sludge to improve the efficiency of the reaction. However, when the sewage enters the sewage inlet pipe 2, it will impact the turbofan 6, causing the turbofan 6 to rotate. Through the rotation of the turbofan 6, the sewage entering the reaction tank 1 from the sewage inlet pipe 2 will be dispersed to reduce the impact of the sewage on the aerobic granular sludge in the reaction tank 1. In addition, since the turbofan 6 is connected to the horizontal axis 81 and the horizontal axis 8 The reciprocating assembly 82 is connected with the air cylinder 83. When the turbofan 6 is impacted and rotated by the sewage, the reciprocating assembly 82 transmits the rotational power of the turbofan 6 to the air cylinder 83, so that the air cylinder 83 repeatedly inflates and exhausts the airbag 7, so that the airbag 7 can repeatedly expand and contract, thereby adjusting the frequency of the reduction of the opening of the drain pipe 3 according to the speed of the sewage flowing into the sewage inlet pipe 2, adjusting the speed of sewage discharge, so that the sewage can fully stay in the reaction tank 1 to react with the aerobic granular sludge, and the sewage after the reaction is first filtered by the filter plate 31, then enters the sealing cover 32, and is discharged from the drain port 33.

[0043] Specifically, the reciprocating assembly 82 includes a transmission bevel gear 821 disposed outside the sewage inlet pipe 2 and fixedly sleeved with the end of the horizontal shaft 81, a connecting gear 822 rotatably disposed at one end of the transmission bevel gear 821 away from the horizontal shaft 81 and meshing with the transmission bevel gear 821, a connecting shaft 823 rotatably connected to the side of the reaction tank 1 away from the drain outlet 33 and fixedly connected to the connecting gear 822, a rotating wheel 824 fixedly connected to the top of the connecting shaft 823 and located at the top of the sealing cover 32, an eccentric shaft 825 fixedly connected to the rotating wheel 824, and a connecting shaft 826 rotatably connected to the eccentric shaft 826. The connecting rod 826 is connected to the top of the sealing cover 32 and connected to the cylinder member 83, the cylinder member 83 includes a cylinder body 831 fixedly arranged at the top of the sealing cover 32, a piston 833 that moves laterally in the cylinder body 831, a push rod 832 that laterally penetrates the cylinder body 831 near one end of the connecting rod 826 and is fixedly connected to the piston 833, and a connecting pipe 834 that is fixedly arranged at one end of the cylinder body 831 away from the push rod 832 and communicates with the cylinder body 831 and the airbag 7, the push rod 832 is slidably connected to the cylinder body 831, and the push rod 832 is rotatably connected to one end of the connecting rod 826 away from the eccentric shaft 825;

[0044] When sewage enters the sewage inlet pipe 2 and impacts the turbofan 6, causing the turbofan 6 to rotate, the turbofan 6 will synchronously drive the horizontal shaft 81 to rotate. At this time, the transmission bevel gears 821 connected to the two ends of the horizontal shaft 81 will also rotate synchronously. Since the transmission bevel gears 821 are meshed with the connecting gears 822 on the corresponding connecting shaft 823, when the transmission bevel gears 821 rotate, the connecting shaft 823 will also rotate synchronously. Then, the connecting shaft 823 will drive the connected runner 824 to rotate. Since the eccentric shaft 825 is eccentrically arranged on the runner 824, the eccentric shaft 825 will also rotate as the runner 824 rotates. At this time, under the connection action of the connecting rod 826, the eccentric shaft 825 The rotation can be converted into the lateral reciprocating movement of the push rod 832. When the push rod 832 moves toward one end of the connecting tube 834, the piston 833 will compress the air in the cylinder 831 to form a high-pressure area, and the high-pressure gas will be transported to the airbag 7 through the wheel 824 to expand the airbag 7. When the push rod 832 moves in the opposite direction, the piston 833 will pull the air in the cylinder 831 to form a low-pressure area, and the air in the airbag 7 will be sucked into the cylinder 831 through the connecting tube 834 to shrink the airbag 7. Afterwards, the frequency of the expansion and contraction of the airbag 7 can change the frequency of the size change of the drain port 33 accordingly, thereby realizing the adjustment of the drainage speed.

[0045] In addition, in order to improve the protection of components such as the sewage inlet pipe 2, the transmission bevel gear 821, the transmission bevel gear 821 and the connecting shaft 823, a protective box 11 is fixedly connected to the side of the reaction tank 1 corresponding to the sewage inlet pipe 2, and the protective box 11 is covered on the outside of the sewage inlet pipe 2, the transmission bevel gear 821, the transmission bevel gear 821 and the connecting shaft 823. The top of the connecting shaft 823 passes through the protective box 11 and is rotatably connected to the protective box 11; the design of the protective box 11 can provide additional protection for components such as the inlet pipe 2, the transmission bevel gear 821, the transmission bevel gear 821 and the connecting shaft 823, which helps to reduce damage to components such as the inlet pipe 2, the transmission bevel gear 821, the transmission bevel gear 821 and the connecting shaft 823 caused by external environmental factors, thereby extending the service life of the equipment.

[0046] Furthermore, the aeration structure 4 includes a fixed pipe 41 fixedly installed at the bottom end of the reaction tank 1, an aerator 42 fixedly connected to the fixed pipe 41 and distributed in a linear array, an air inlet pipe 43 running through one side of the reaction tank 1 corresponding to the drain pipe 3 and connected to the fixed pipe 41, and a fan 44 arranged on the outside of the reaction tank 1 and connected to the air inlet pipe 43, and the air inlet pipe 43 is fixedly connected to the reaction tank 1;

[0047] When the fan 44 is started, external oxygen will be sent into the fixed pipe 41 through the air inlet pipe 43. Then, the oxygen is distributed in the fixed pipe 41 and flows to multiple aerators 42. The aerators 42 will disperse the oxygen into a large number of tiny bubbles. As the bubbles rise, they will drive the water to flow, so that the oxygen in the bubbles will gradually dissolve into the sewage and mix with the aerobic granular sludge, thereby providing a suitable living environment for aerobic microorganisms.

[0048] Furthermore, the stirring structure 5 includes a stirring shaft 51 rotatably arranged in the reaction tank 1 at a position above the corresponding air inlet pipe 43, and a stirring blade 52 arranged in the reaction tank 1 and fixedly connected to the stirring shaft 51;

[0049] When the stirring shaft 51 is started to rotate, the stirring blades 52 on the stirring shaft 51 will also rotate. When the stirring blades 52 are rotating, they will push the sewage to form vortices or turbulence in the reaction tank 1. This flow state helps to break the stratification phenomenon in the sewage, allowing the aerobic granular sludge to fully contact and react with the sewage, thereby improving the efficiency of sewage treatment.

[0050] Example 2

[0051] Different from Example 1, in order to facilitate the transmission of the power of the fan 44 to the stirring shaft 51 and reduce energy consumption, the sewage treatment system also includes a transmission belt structure 9 connected to the stirring shaft 51 and the fan 44 for transmitting the power of the fan 44 to the stirring shaft 51. The transmission belt structure 9 includes a fixed plate 91 fixedly arranged on the reaction tank 1, a transmission shaft 92 coaxially fixedly connected to the fan blades of the air inlet pipe 43, a transmission wheel 93 fixedly sleeved on the top of the transmission shaft 92 and the stirring shaft 51, and a transmission belt 94 arranged on the two transmission wheels 93. The transmission shaft 92 and the top of the stirring shaft 51 are both rotatably connected to the fixed plate 91, and the two transmission wheels 93 are connected and transmit power through the transmission belt 94;

[0052] When the fan 44 is started, the fan blades begin to rotate, and then they will drive the transmission shaft 92 coaxially connected thereto to rotate together. The rotation of the transmission shaft 92 will be transmitted to the transmission belt 94 through the transmission wheel 93 fixedly sleeved on the top thereof. Since the two transmission wheels 93 are connected and transmit power through the transmission belt 94, when the transmission wheel 93 connected to the transmission shaft 92 rotates, the transmission wheel 93 connected to the stirring shaft 51 will also rotate synchronously, so that the stirring shaft 51 can rotate synchronously, and then the stirring shaft 51 will drive the stirring blades 52 connected thereto to rotate together, thereby producing a stirring effect.

[0053] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical solution and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A sewage treatment system based on aerobic granular sludge continuous flow, comprising a reaction tank (1), a sewage inlet pipe (2) connected to one side of the bottom of the reaction tank (1), a drainage pipe (3) fixedly arranged at the top of the reaction tank (1), an aeration structure (4) and a stirring structure (5) arranged in the reaction tank (1); Features: The sewage treatment system further comprises a turbofan (6) rotatably arranged inside the sewage inlet pipe (2) on a side close to the reaction tank (1) for being impacted by sewage, an air bag (7) fixedly arranged inside the outlet end of the drainage pipe (3) for changing the outlet size of the drainage pipe (3), and a suction air structure (8) arranged on one side of the reaction tank (1) and connected to the turbofan (6) and the air bag (7) for repeatedly expanding and contracting the air bag (7); The air suction structure (8) comprises a transverse axis (81) rotatably connected to the sewage inlet pipe (2) and coaxially fixedly connected to the turbofan (6), an air cylinder component (83) symmetrically arranged on the drainage pipe (3) and connected to the air bag (7) for sucking air from the air bag (7), and a reciprocating component (82) arranged on the outside of the sewage inlet pipe (2) and respectively connected to both ends of the transverse axis (81) for transmitting power of the turbofan (6) to the two air cylinder components (83) so that the two air cylinder components (83) repeatedly suck air.

2. The aerobic granular sludge continuous flow sewage treatment system according to claim 1 is characterized by: The drainage pipe (3) comprises a filter plate (31) fixedly arranged at the top end inside the reaction tank (1), a sealing cover (32) fixedly arranged at the top end of the filter plate (31), and a drainage port (33) opened on one side of the sealing cover (32), and the air bag (7) is fixedly arranged inside the drainage port (33).

3. The aerobic granular sludge continuous flow sewage treatment system according to claim 2 is characterized in that: The reciprocating assembly (82) comprises a transmission bevel gear (821) arranged outside the sewage inlet pipe (2) and fixedly sleeved with the end of the transverse shaft (81), a connecting gear (822) rotatably arranged at one end of the transmission bevel gear (821) away from the transverse shaft (81) and meshing with the transmission bevel gear (821), a connecting shaft (823) rotatably connected to a side of the reaction tank (1) away from the drain outlet (33) and fixedly connected to the connecting gear (822), a rotating wheel (824) fixedly connected to the top end of the connecting shaft (823) and located at the top end of the sealing cover (32), an eccentric shaft (825) fixedly connected to the rotating wheel (824), and a connecting rod (826) rotatably connected to the top end of the eccentric shaft (825) and connected to the air cylinder member (83).

4. The aerobic granular sludge continuous flow sewage treatment system according to claim 3 is characterized by: The air cylinder member (83) comprises a cylinder (831) fixedly arranged at the top end of the sealing cover (32), a piston (833) which moves laterally in the cylinder (831), a push rod (832) which passes laterally through the cylinder (831) near one end of the connecting rod (826) and is fixedly connected to the piston (833), and a connecting tube (834) which is fixedly arranged at one end of the cylinder (831) away from the push rod (832) and is connected to the cylinder (831) and the air bag (7), wherein the push rod (832) is slidably connected to the cylinder (831), and the push rod (832) is rotationally connected to one end of the connecting rod (826) away from the eccentric shaft (825).

5. The aerobic granular sludge continuous flow sewage treatment system according to claim 3 is characterized in that: A protection box (11) is fixedly connected to one side of the reaction tank (1) corresponding to the sewage inlet pipe (2); the protection box (11) is arranged to cover the sewage inlet pipe (2), the transmission bevel gear (821), the outside of the transmission bevel gear (821) and the connecting shaft (823); the top end of the connecting shaft (823) passes through the protection box (11) and is rotatably connected to the protection box (11).

6. The aerobic granular sludge continuous flow sewage treatment system according to claim 1, characterized in that: The aeration structure (4) comprises a fixed pipe (41) fixedly mounted at the bottom end of the reaction tank (1), an aerator (42) fixedly connected to the fixed pipe (41) and distributed in a linear array, an air intake pipe (43) penetrating the side of the reaction tank (1) corresponding to the drainage pipe (3) and connected to the fixed pipe (41), and a fan (44) arranged on the outside of the reaction tank (1) and connected to the air intake pipe (43), wherein the air intake pipe (43) is fixedly connected to the reaction tank (1).

7. The aerobic granular sludge continuous flow sewage treatment system according to claim 6, characterized in that: The stirring structure (5) comprises a stirring shaft (51) rotatably arranged in the reaction tank (1) at a position above the air inlet pipe (43), and a stirring blade (52) arranged in the reaction tank (1) and fixedly connected to the stirring shaft (51).

8. The aerobic granular sludge continuous flow sewage treatment system according to claim 7, characterized in that: The sewage treatment system further comprises a transmission belt structure (9) arranged in connection with the stirring shaft (51) and the fan (44) for transmitting power of the fan (44) to the stirring shaft (51).

9. The aerobic granular sludge continuous flow sewage treatment system according to claim 8, characterized in that: The transmission belt structure (9) comprises a fixed plate (91) fixedly arranged on the reaction tank (1), a transmission shaft (92) fixedly connected to the fan blades of the air inlet pipe (43) coaxially, a transmission wheel (93) fixedly sleeved on the top of the transmission shaft (92) and the stirring shaft (51), and a transmission belt (94) arranged on the two transmission wheels (93); the top of the transmission shaft (92) and the stirring shaft (51) are both rotatably connected to the fixed plate (91); and the two transmission wheels (93) are connected through the transmission belt (94) to transmit power.

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