A MBBR bioreactor

Abstract

The present application is used in sewage treatment technical field, disclose a kind of MBBR bioreactor, including aeration tank, the lower end outer surface of one side of the aeration tank is fixedly provided with water inlet pipe, and the upper end outer surface of one side of the aeration tank is fixedly provided with water outlet pipe, the outside surface of the aeration tank is provided with cyclone activation mechanism, the removal effect of pollutant is strengthened by the driving rotation of water flow to ensure that suspended filler can constantly move.This MBBR bioreactor, using the modified polyurethane filler loaded with activated carbon to make suspended filler, combined with the use of aeration pipe designed by step air volume, so that suspended filler can form cyclone during the operation of the reactor, so that suspended filler will not deposit in the bottom of aeration tank, compared with the way of increasing aeration or installing mechanical pusher device in traditional process, can better ensure the stability of suspended filler, avoid the drawbacks of activated carbon falling off caused by suspended filler easily damaged.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to an MBBR bioreactor. Background Technology

[0002] Moving bed bioreactors (MBBRs) are wastewater treatment devices that combine the advantages of traditional fluidized bed and biological contact oxidation methods. They are widely used in various applications, including domestic and industrial water treatment, and upgrading existing wastewater treatment plants. The core of a moving bed bioreactor is the suspended packing material, and the fluidization of this material is crucial for MBBR reactor control. Existing MBBR reactors typically consist of a composite biofilm system composed of activated sludge and suspended packing material at a certain concentration. To ensure the suspended packing material remains in a fluidized state, this is usually achieved by increasing aeration levels or installing mechanical flow propulsion devices at the bottom of the aeration chamber. A packing interceptor is installed at the effluent end of the reactor to prevent packing escape. At the same time, an air-lift device is installed to transport the suspended packing that has accumulated at the end to the influent end. During the operation and maintenance of this type of composite MBBR reactor, it is necessary to ensure the stability and fluidization of activated sludge and suspended packing. It has disadvantages such as complex structure, high energy consumption, large amount of residual sludge production, and easy damage to suspended packing and shedding of loaded activated carbon. In addition, since the density of suspended packing in the moving bed bioreactor is close to that of water, the aeration volume needs to consider not only the air volume required for the biological activity of activated sludge, but also the air volume required for the disturbance of suspended packing. The aeration volume is larger than that of the traditional activated sludge process, resulting in high energy consumption. Meanwhile, due to factors such as influent flow and aeration disturbance, suspended media in the aeration chamber of the MBBR reactor are prone to agglomeration and sedimentation, and dead zones without suspended media can easily form inside the reactor. This can lead to a reduction in reactor throughput. Moreover, increasing the aeration rate or installing mechanical flow propulsion, interception nets, or end-of-pipe air lifting devices to achieve uniform fluidization of the suspended media will complicate the reactor structure and increase the difficulty of operation and maintenance. The additional aeration rate and electric flow propulsion devices also increase energy consumption. For modified suspended media loaded with activated carbon, excessive aeration or mechanical agitation can easily cause activated carbon to fall off, damage the structure of the suspended media, and significantly shorten the service life of the suspended media. Summary of the Invention

[0003] The purpose of this invention is to provide an MBBR bioreactor to solve the problem of inadequate methods for preventing the aggregation and deposition of suspended packing materials mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an MBBR bioreactor, comprising an aeration box, wherein an inlet pipe is fixedly installed on the lower outer surface of one side of the aeration box, and an outlet pipe is fixedly installed on the upper outer surface of one side of the aeration box, and an outlet weir is provided at the end of the outlet pipe inside the aeration box; a perforated flower wall is fixedly installed inside the upper end of the aeration box, and overflow ports are evenly opened on the upper outer surface of the perforated flower wall; a partition plate is fixedly installed on the inner surface of the aeration box between the perforated flower wall and the outlet pipe; the inlet... One end of the pipe penetrates the inner surface of the aeration box, and a guide slope is fixedly provided on the inner bottom surface of the end of the aeration box through which the water inlet pipe penetrates. A settling slope is fixedly provided on the inner bottom surface of the aeration box below the partition plate. A sludge discharge hole is opened on the lower surface of the perforated flower wall. An aeration pipe is fixedly installed on the inner bottom surface of the aeration box. Suspended packing is placed inside the aeration box. A vortex activation mechanism is provided on the outer surface of the aeration box. By driving the water flow to rotate, the suspended packing can be continuously moved to enhance the removal effect of pollutants.

[0005] Preferably, the vortex activation mechanism includes: an air pipe connector, which is fixedly disposed on one side surface of the aeration box, and the side surface of the air pipe connector is penetrated by one end of the delivery pipe, and the other end of the delivery pipe is fixedly connected to the side surface of the aeration box. The upper end of the diversion pipe is fixedly connected to the lower outer surface of the delivery pipe, and the lower end of the diversion pipe penetrates the lower inner surface of the aeration box and communicates with the aeration pipe. A solenoid valve is fixedly installed on the middle section of the outer surface of the diversion pipe.

[0006] By adopting the above technical solution, aeration pipes at different locations can drive the water body to swirl through different air output volumes.

[0007] Preferably, one end of the aeration box is equipped with a timely sludge discharge structure, which automatically discharges sludge by monitoring the sludge height at the bottom of the aeration box, thereby reducing the wastewater carried out during the sludge discharge process.

[0008] By adopting the above technical solution, the discharge of sludge can be automatically stopped when the amount of sludge is small, thus preventing the discharge of sewage.

[0009] Preferably, the timely sludge discharge structure includes: a perforated sludge discharge pipe, an inlet hole on the upper surface of the perforated sludge discharge pipe, a sliding sliding rod installed inside the perforated sludge discharge pipe, and a transfer hole evenly distributed on the outer surface of the sliding rod, and a discharge hole on the lower surface of the aeration box below the sliding rod; a mounting box fixedly installed on the side surface of the end of the conveying pipe connected to the air pipe connector, and a rotating impeller installed inside the mounting box; a drive rod fixedly connected to the lower end of the impeller shaft, and the lower end of the drive rod penetrating the lower surface of the mounting box; a sliding contact plate installed on the side surface of the lower end of the drive rod, and a support spring connected between the contact plate and the drive rod; a return spring connected between the end of the sliding rod outside the aeration box and the outer surface of the aeration box, and a limit groove opened on the outer surface of the end of the sliding rod outside the aeration box; a contact block installed inside the aeration box, and a connecting rod fixedly connected to the upper end of the contact block; and an electric push rod fixedly installed on the side surface of one end of the aeration box.

[0010] By adopting the above technical solution, the electric push rod can monitor the state of sludge in the aeration box and change the limited state of the sliding rod by starting it in a timely manner.

[0011] Preferably, the upper end of the diversion pipe is connected to the air pipe connector, and the diversion pipe and the aeration pipe are configured in a one-to-one correspondence.

[0012] By adopting the above technical solution, the diversion pipe can inject gas into the aeration pipe through different gas volumes.

[0013] Preferably, the opening degree of the valves of the different solenoid valves is different. The valve opening degree of the solenoid valve closer to the perforated flower wall is the largest, and the valve opening degree of the solenoid valve closer to the water inlet pipe is the smallest. Moreover, the opening degree of the valve of the solenoid valve gradually and uniformly increases as the distance from the perforated flower wall decreases.

[0014] By adopting the above technical solution, the aeration pipe can drive the water body to swirl clockwise with different air volumes.

[0015] Preferably, both ends of the perforated sludge discharge pipe penetrate the outer surface of the aeration box, and the perforated sludge discharge pipe and the sliding rod are connected by sliding friction. The sludge inlet holes are evenly distributed on the outer surface of the end of the perforated sludge discharge pipe located inside the aeration box, and the sludge inlet holes are located directly above the discharge holes. The transfer hole and the sludge inlet holes are staggered.

[0016] By adopting the above technical solution, sludge will not be discharged directly through the discharge hole, ensuring that sewage will not be discharged through the discharge hole when the amount of sludge is insufficient.

[0017] Preferably, the outer surface of the impeller is in contact with the inner surface of the mounting box, and one end of the impeller penetrates the inner surface of the conveying pipe.

[0018] By adopting the above technical solution, the impeller can rotate under the impact of airflow.

[0019] Preferably, the contact plate has an arc-shaped design, and the outer surface of the contact plate is in contact with the outer end of the sliding rod located outside the aeration box. The sliding rod is engaged with the connecting rod through a limiting groove. The connecting rod is slidably connected to the aeration box. The contact block has a right-angled trapezoidal design, and the inclined surface of the contact block is set upward towards the inside of the aeration box. A gap is left between the lower end face of the contact block and the outer surface of the perforated sludge discharge pipe. One side surface of the connecting rod is in contact with the upper surface of one end of the electric push rod.

[0020] By adopting the above technical solution, the electric push rod will not drive the connecting rod to slide down synchronously when it slides down to reset, so that the connecting rod will not limit the sliding rod when there is a lot of silt.

[0021] Preferably, the suspended packing is a modified polyurethane packing supported on activated carbon, and the density of the suspended packing is 0.02-0.03 g / ml, the specific surface area of ​​the suspended packing is ≥800 m² / g, and the volume of the suspended packing is 25% of the internal volume of the aeration box.

[0022] The above technical solution enables suspended packing material to better adsorb and treat wastewater.

[0023] Compared with the prior art, the beneficial effects of the present invention are: the MBBR bioreactor:

[0024] 1. The use of suspended packing made of modified polyurethane packing with activated carbon and aeration pipe with stepped air volume design enables the suspended packing to form a swirling flow during reactor operation. This prevents the suspended packing from settling at the bottom of the aeration box. Compared with the traditional method of increasing aeration or adding mechanical flow propulsion devices, this method can better ensure the stability of the suspended packing and avoid the disadvantage of the suspended packing being easily damaged and causing the activated carbon to fall off.

[0025] 2. Furthermore, by using the swirling flow of sewage in the aeration box to drive the sludge inside the lower end of the aeration box, the sludge can automatically enter the other side of the perforated flower wall through the sludge discharge hole at the lower end of the perforated flower wall, thereby enabling the sewage and sludge to be automatically separated.

[0026] 3. Furthermore, by driving the impeller to rotate during the gas flow in the delivery pipe, the impeller, in conjunction with the reset spring, alternately drives the sliding rod to slide back and forth. Combined with the contact block to monitor the sludge height in the aeration box, the system can automatically discharge sludge when the sludge height in the aeration box is high, thereby reducing the occurrence of sewage being carried out during sludge discharge. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0028] Figure 2 This is a three-dimensional structural diagram showing the connection between the delivery pipe, the diversion pipe, and the solenoid valve of the present invention.

[0029] Figure 3 This is a schematic diagram of the overall cross-sectional three-dimensional structure of the present invention;

[0030] Figure 4 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the contact block and the connecting rod of the present invention;

[0031] Figure 5 This is a schematic diagram of the three-dimensional structure connecting the aeration box, perforated flower wall, and partition plate of the present invention;

[0032] Figure 6 This is a three-dimensional structural diagram of the connection between the connecting rod and the electric push rod of the present invention;

[0033] Figure 7 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the mounting box and the impeller of the present invention;

[0034] Figure 8 This is a three-dimensional structural diagram of the cross-sectional view of the connection between the aeration box and the aeration pipe of the present invention;

[0035] Figure 9 This is a three-dimensional structural diagram of the connection between the contact plate and the support spring of the present invention;

[0036] Figure 10 This is a three-dimensional structural diagram of the connection between the drive rod, contact plate, and support spring of the present invention.

[0037] In the diagram: 1. Aeration box; 2. Inlet pipe; 3. Outlet pipe; 4. Perforated flower wall; 5. Overflow port; 6. Divider plate; 7. Guide slope; 8. Settling slope; 9. Sludge discharge hole; 10. Aeration pipe; 11. Suspended packing; 12. Air pipe connector; 13. Delivery pipe; 14. Diverter pipe; 15. Solenoid valve; 16. Perforated sludge discharge pipe; 17. Sludge inlet hole; 18. Sliding rod; 19. Transfer hole; 20. Discharge hole; 21. Mounting box; 22. Impeller; 23. Drive rod; 24. Contact plate; 25. Support spring; 26. Return spring; 27. Limiting groove; 28. Contact block; 29. ​​Connecting rod; 30. Electric push rod. Detailed Implementation

[0038] 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.

[0039] Please see Figure 1-10 The present invention provides a technical solution: an MBBR bioreactor.

[0040] Example 1

[0041] This embodiment discloses: an aeration box 1, with an inlet pipe 2 fixedly installed on the lower outer surface of one side of the aeration box 1, and an outlet pipe 3 fixedly installed on the upper outer surface of one side of the aeration box 1. An outlet weir is provided at one end of the outlet pipe 3 inside the aeration box 1. A perforated flower wall 4 is fixedly installed inside the upper part of the aeration box 1, and overflow ports 5 are evenly distributed on the upper outer surface of the perforated flower wall 4. A partition plate 6 is fixedly installed on the inner surface of the aeration box 1 between the perforated flower wall 4 and the outlet pipe 3. One end of the inlet pipe 2 penetrates the inner surface of the aeration box 1. The aeration box 1 has a guide slope 7 fixedly installed on the bottom surface of the end through which the inlet pipe 2 passes. The bottom surface of the aeration box 1 below the partition plate 6 has a settling slope 8 fixedly installed on the bottom surface of the end. The perforated flower wall 4 has a sludge discharge hole 9 on its lower surface. The aeration pipe 10 is fixedly installed on the bottom surface of the aeration box 1. The aeration box 1 has a suspended packing material 11 inside. The outer surface of the aeration box 1 has a vortex activation mechanism. By driving the water flow to rotate, the suspended packing material 11 can be continuously moved to enhance the removal effect of pollutants.

[0042] The vortex activation mechanism includes: an air pipe connector 12, which is fixedly installed on one side surface of the aeration box 1, and the side surface of the air pipe connector 12 is penetrated by one end of the delivery pipe 13, and the other end of the delivery pipe 13 is fixedly connected to the side surface of the aeration box 1. The upper end of the diversion pipe 14 is fixedly connected to the lower outer surface of the delivery pipe 13, and the lower end of the diversion pipe 14 penetrates the lower inner surface of the aeration box 1 and is connected to the aeration pipe 10. A solenoid valve 15 is fixedly installed on the middle section of the outer surface of the diversion pipe 14.

[0043] The upper end of the diversion pipe 14 is connected to the air pipe connector 12, and the diversion pipe 14 and the aeration pipe 10 are set in a one-to-one correspondence.

[0044] The opening degree of different solenoid valves 15 is different. The opening degree of the solenoid valve 15 closest to the perforated flower wall 4 is the largest, and the opening degree of the solenoid valve 15 closest to the water inlet pipe 2 is the smallest. Furthermore, the opening degree of the solenoid valve 15 gradually and uniformly increases as the distance from the perforated flower wall 4 decreases.

[0045] The suspended packing 11 is a modified polyurethane packing supported on activated carbon, and the density of the suspended packing 11 is 0.02-0.03 g / ml, the specific surface area of ​​the suspended packing 11 is ≥800 m² / g, and the volume of the suspended packing 11 is 25% of the internal volume of the aeration box 1.

[0046] When the floating packing reactor is running, there is no activated sludge in the aeration box 1. The suspended packing 11, which is loaded with microorganisms and is in a fluidized state, is in constant contact with water to remove pollutants. The stepped air volume aeration pipes 10 in the aeration box 1 are controlled by the solenoid valves 15 on the diversion pipes 14 connected to the air pipe joints 12 and the delivery pipes 13 to achieve stepped aeration in different areas. Specifically, the aeration volume increases in steps from the inlet pipe 2 to the perforated flower wall 4. This air lifting and turbulence action keeps the suspended packing 11 in a clockwise rotating fluidized state, which effectively solves the problem of the suspended packing 11 settling at the bottom of the tank and accumulating in a certain area to form a dead zone. The perforated flower wall 4 is equipped with an overflow port 5 and a sludge discharge hole 9 at the bottom. The purified water in the aeration box 1 enters the aeration box 1 where the partition plate 6 is located from the overflow port 5. The suspended sludge in the water settles to the bottom of the aeration box 1 below the partition plate 6, and the clean water overflows from the outlet pipe 3 through the outlet weir. The guide slope 7 and the settling slope 8 can ensure that the sludge accumulates in the middle of the aeration box 1 and is discharged better.

[0047] The ratio of aeration volume to influent volume is 10-15. The air volume of the stepped air aeration pipe 10 increases in stages from the influent pipe 2 to the perforated flower wall 4. According to the zoning, the aeration box 1 is divided into three equal parts from the influent pipe 2 to the perforated flower wall 4: the front 1 / 3 area, the middle 1 / 3 area, and the rear 1 / 3 area. The aeration pipe 10 in the front 1 / 3 area controls the air volume to 10% of the total air volume through the solenoid valve 15 of the dividing pipe 14. The aeration pipe 10 in the middle 1 / 3 area controls the air volume to 30% of the total air volume through the solenoid valve 15 of the dividing pipe 14. The aeration pipe 10 in the rear 1 / 3 area controls the air volume to 60% of the total air volume through the solenoid valve 15 of the dividing pipe 14.

[0048] Example 2

[0049] This embodiment discloses, based on embodiment 1, that: one end of the aeration box 1 is provided with a timely sludge discharge structure, and the sludge is automatically discharged by monitoring the sludge height at the bottom of the aeration box 1, so as to reduce the sewage carried out during the sludge discharge process;

[0050] The timely sludge discharge structure includes: a perforated sludge discharge pipe 16, with a sludge inlet hole 17 on the upper surface of the perforated sludge discharge pipe 16; a sliding sliding rod 18 installed inside the perforated sludge discharge pipe 16; a transfer hole 19 evenly distributed on the outer surface of the sliding rod 18; a discharge hole 20 on the lower surface of the aeration box 1 below the sliding rod 18; a mounting box 21 fixedly installed on the side surface of the end of the conveying pipe 13 connected to the air pipe connector 12; a rotating impeller 22 installed inside the mounting box 21; a drive rod 23 fixedly connected to the lower end of the shaft of the impeller 22; and the lower end of the drive rod 23... The end of the drive rod 23 penetrates the lower surface of the mounting box 21. A sliding contact plate 24 is installed on the lower side surface of the drive rod 23, and a support spring 25 is connected between the contact plate 24 and the drive rod 23. A return spring 26 is connected between the end of the sliding rod 18 located outside the aeration box 1 and the outer surface of the aeration box 1. A limit groove 27 is opened on the outer surface of the end of the sliding rod 18 located outside the aeration box 1. A contact block 28 is provided inside the aeration box 1, and one end of the connecting rod 29 is fixedly connected to the upper end of the contact block 28. An electric push rod 30 is fixedly installed on one side surface of the aeration box 1.

[0051] Both ends of the perforated sludge discharge pipe 16 penetrate the outer surface of the aeration box 1, and the perforated sludge discharge pipe 16 and the sliding rod 18 are connected by sliding friction. The sludge inlet holes 17 are evenly distributed on the outer surface of the end of the perforated sludge discharge pipe 16 located inside the aeration box 1, and the sludge inlet holes 17 are located directly above the discharge hole 20. The transfer hole 19 is offset from the sludge inlet holes 17.

[0052] The outer surface of the impeller 22 is in contact with the inner surface of the mounting box 21, and one end of the impeller 22 penetrates the inner surface of the conveying pipe 13.

[0053] The contact plate 24 is arc-shaped, and the outer surface of the contact plate 24 is in contact with the outer end of the sliding rod 18 located outside the aeration box 1. The sliding rod 18 is engaged with the connecting rod 29 through the limiting groove 27. The connecting rod 29 is slidably connected to the aeration box 1. The contact block 28 is right-angled trapezoidal, and the inclined surface of the contact block 28 is set upward towards the inside of the aeration box 1. A gap is left between the lower end face of the contact block 28 and the outer surface of the perforated sludge discharge pipe 16. One side surface of the connecting rod 29 is in contact with the upper surface of one end of the electric push rod 30.

[0054] The denser bottom sludge in the aeration box 1 is pushed by the clockwise water flow and enters the perforated sludge discharge pipe 16 through the sludge discharge hole 9 at the bottom of the perforated flower wall 4. At this time, as the air pipe connector 12 injects gas into the delivery pipe 13 for aeration, the gas flows through the mounting box 21 and drives the impeller 22 to rotate. The drive rod 23, which rotates synchronously with the impeller 22, drives the sliding rod 18 to slide through the support spring 25 at the lower end supporting the contact plate 24. This allows the transfer hole 19 on the outer surface of the sliding rod 18 to coincide with the sludge inlet hole 17 and the discharge hole 20. At this time, the sludge is discharged downward through the sludge inlet hole 17, the transfer hole 19 and the discharge hole 20 under pressure. The reset spring 26 drives the sliding rod 18 to reset when the contact plate 24 is not in contact with the sliding rod 18.

[0055] Every so often, the electric push rod 30 starts according to the preset start interval, driving the connecting rod 29 to move upward. Then, one end of the electric push rod 30 moves downward to reset. When there is a lot of sludge at the bottom of the aeration box 1, the connecting rod 29 cannot slide down to reset and engage with the limiting groove 27 because of the contact block 28 contacting the sludge when it loses the support of the electric push rod 30. This allows the sliding rod 18 to slide back and forth to discharge the sludge.

[0056] The electric push rod 30 starts according to the preset start interval, driving the connecting rod 29 to move upward. Then, one end of the electric push rod 30 moves downward to reset. When there is less sludge at the bottom of the aeration box 1, the connecting rod 29 slides down to reset and engages with the limiting groove 27 because the contact block 28 is not blocked by the sludge when it loses the support of the electric push rod 30. This limits the sliding rod 18 so that it cannot slide back and forth, thus preventing the sludge in the aeration box 1 from being discharged and avoiding the discharge of a large amount of sewage after the sludge is discharged. At this time, when the contact plate 24 contacts the sliding rod 18, it ensures that the drive rod 23 can continue to rotate by sliding and compressing the support spring 25.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An MBBR bioreactor, comprising an aeration tank (1), wherein an inlet pipe (2) is fixedly disposed on the lower outer surface of one side of the aeration tank (1), and an outlet pipe (3) is fixedly disposed on the upper outer surface of one side of the aeration tank (1), and an outlet weir is disposed at one end of the outlet pipe (3) inside the aeration tank (1), characterized in that: The aeration box (1) is fixedly provided with a perforated flower wall (4) at the upper end, and overflow ports (5) are evenly provided on the outer surface of the upper end of the perforated flower wall (4). A partition plate (6) is fixedly provided on the inner surface of the aeration box (1) between the perforated flower wall (4) and the water outlet pipe (3). One end of the water inlet pipe (2) penetrates the inner surface of the aeration box (1), and a guide slope (7) is fixedly provided on the bottom surface of the end of the aeration box (1) penetrated by the water inlet pipe (2). The partition plate (6) A settling slope (8) is fixedly installed on the bottom surface of one end of the aeration box (1) below. A sludge discharge hole (9) is opened on the lower surface of the perforated flower wall (4). An aeration pipe (10) is fixedly installed on the bottom surface of the aeration box (1). A suspended filler (11) is placed inside the aeration box (1). A vortex activation mechanism is provided on the outer surface of the aeration box (1). By driving the water flow to rotate, the suspended filler (11) can continuously move to enhance the removal effect of pollutants. One end of the aeration box (1) is provided with a timely sludge discharge structure; the timely sludge discharge structure includes: a perforated sludge discharge pipe (16), the upper surface of the perforated sludge discharge pipe (16) is provided with a sludge inlet hole (17), a sliding sliding rod (18) is installed inside the perforated sludge discharge pipe (16), and a transfer hole (19) is evenly provided on the outer surface of the sliding rod (18), and a discharge hole (20) is provided on the lower surface of the aeration box (1) below the sliding rod (18). A mounting box (21) is fixedly provided on the side surface of the end of the conveying pipe (13) connected to the air pipe connector (12), and a rotating impeller (22) is installed inside the mounting box (21). A drive rod (23) is fixedly connected to the lower end of the shaft of the impeller (22), and the lower end of the drive rod (23) penetrates the lower surface of the mounting box (21). A sliding contact plate (24) is installed on the side surface of the lower end of the drive rod (23). A support spring (25) is connected between the contact plate (24) and the drive rod (23). A return spring (26) is connected between the end of the sliding rod (18) located outside the aeration box (1) and the outer surface of the aeration box (1). A limit groove (27) is opened on the outer surface of the end of the sliding rod (18) located outside the aeration box (1). A contact block (28) is provided inside the aeration box (1). One end of the connecting rod (29) is fixedly connected to the upper end of the contact block (28). An electric push rod (30) is fixedly installed on the side surface of one end of the aeration box (1). The contact plate (24) is arc-shaped. The outer surface of the contact plate (24) is in contact with the outer surface of the end of the sliding rod (18) located outside the aeration box (1). The sliding rod (18) is engaged with the connecting rod (29) through the limit groove (27). The connecting rod (29) is slidably connected to the aeration box (1).

2. The MBBR bioreactor according to claim 1, characterized in that: The swirling activation mechanism includes: an air pipe connector (12), which is fixedly installed on one side surface of the aeration box (1), and the side surface of the air pipe connector (12) is penetrated by one end of the delivery pipe (13), and the other end of the delivery pipe (13) is fixedly connected to the side surface of the aeration box (1). The upper end of the diversion pipe (14) is fixedly connected to the lower outer surface of the delivery pipe (13), and the lower end of the diversion pipe (14) penetrates the lower inner surface of the aeration box (1) and is connected to the aeration pipe (10). A solenoid valve (15) is fixedly installed on the middle outer surface of the diversion pipe (14).

3. The MBBR bioreactor according to claim 2, characterized in that: The upper end of the diversion pipe (14) is connected to the air pipe connector (12), and the diversion pipe (14) and the aeration pipe (10) are set in a one-to-one correspondence.

4. The MBBR bioreactor according to claim 2, characterized in that: The opening degree of the valve ports of the different solenoid valves (15) is different. The valve port opening degree of the solenoid valve (15) closer to the perforated flower wall (4) is the largest, and the valve port opening degree of the solenoid valve (15) closer to the water inlet pipe (2) is the smallest. Furthermore, the opening degree of the valve port of the solenoid valve (15) gradually and uniformly increases as the distance from the perforated flower wall (4) decreases.

5. An MBBR bioreactor according to claim 1, characterized in that: Both ends of the perforated sludge discharge pipe (16) penetrate the outer surface of the aeration box (1), and the perforated sludge discharge pipe (16) and the sliding rod (18) are connected by sliding friction. The sludge inlet hole (17) is evenly distributed on the outer surface of one end of the perforated sludge discharge pipe (16) located inside the aeration box (1), and the sludge inlet hole (17) is located directly above the discharge hole (20). The transfer hole (19) is offset from the sludge inlet hole (17).

6. The MBBR bioreactor according to claim 1, characterized in that: The outer surface of the impeller (22) is in contact with the inner surface of the mounting box (21), and one end of the impeller (22) penetrates the inner surface of the conveying pipe (13).

7. An MBBR bioreactor according to claim 1, characterized in that: The contact block (28) is designed as a right trapezoid, and the inclined surface of the contact block (28) faces upward toward the interior of the aeration box (1). A gap is left between the lower end face of the contact block (28) and the outer surface of the perforated sludge discharge pipe (16). One end of the connecting rod (29) is in contact with the upper end of the electric push rod (30).

8. An MBBR bioreactor according to claim 1, characterized in that: The suspended filler (11) is a modified polyurethane filler loaded with activated carbon, and the density of the suspended filler (11) is 0.02-0.03 g / ml, and the specific surface area of ​​the suspended filler (11) is ≥800 m² / g. The volume of the suspended filler (11) is 25% of the internal volume of the aeration box (1).

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