Continuous flow aerobic granular sludge biochemical system

Abstract

The invention discloses a continuous flow aerobic granular sludge biochemical system, which relates to the technical field of sewage treatment, and comprises a biochemical treatment pool, an annular reflux plate, a treatment pool water supply and distribution mechanism, an annular aeration pipe, a denitrification promotion mechanism, an auxiliary water distribution mechanism and an overflow water outlet mechanism, the treatment tank water supply and distribution mechanism comprises a water pumping assembly and an annular water distribution assembly; the annular water distribution assembly is mounted at the bottom in the biochemical treatment tank and below the outer edge of the annular backflow plate; according to the continuous flow aerobic granular sludge biochemical system, water is distributed at different water distribution positions and in different water distribution directions, stirring of stirring blades in the denitrification promoting mechanism on water is matched, hydraulic shear force is improved, the mass transfer performance of particles is improved, nitrification products rapidly migrate from an aerobic layer to an anoxic layer of aerobic granular sludge, and the denitrification effect of the aerobic granular sludge is improved. The overall denitrification rate is increased, and the sewage treatment effect is improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a continuous flow aerobic granular sludge biochemical system. Background Technology

[0002] Currently, aerobic granular sludge is a granular activated sludge formed by microbial self-flocculation. It has a regular shape, dense structure, and good sedimentation performance. An dissolved oxygen concentration gradient is formed inside the aerobic granular sludge. The inside of the granules are anaerobic and anoxic zones, while the outer layer of the granules is an aerobic zone. Its unique structure allows different functional bacteria to coexist and has the function of simultaneous nitrogen and phosphorus removal, resulting in high biological treatment efficiency. The existing continuous flow aerobic granular sludge biological treatment system has a single water distribution location and direction, resulting in poor denitrification and poor wastewater treatment performance. Summary of the Invention

[0003] The technical problem to be solved by this invention is to overcome the existing defects and provide a continuous flow aerobic granular sludge biochemical system. By distributing water at different locations and in different directions, and with the stirring of the water by the stirring blades in the denitrification promotion mechanism, the hydraulic shear force is increased, the mass transfer performance of the particles is improved, and nitrification products are allowed to migrate rapidly from the aerobic layer to the anoxic layer of the aerobic granular sludge. At the same time, carbon sources are allowed to enter the anoxic layer quickly, avoiding nitrogen accumulation on the particle surface, thereby improving the overall denitrification rate and improving the treatment effect of wastewater. This can effectively solve the problems in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a continuous flow aerobic granular sludge biological treatment system, comprising a biological treatment tank, and further comprising: An annular reflux plate is installed on the inner wall of the biochemical treatment tank, and the inner annular array of the annular reflux plate has exhaust vents. The water supply and distribution mechanism of the treatment tank includes a water pump assembly and an annular water distribution assembly. The annular water distribution assembly is installed at the bottom of the biochemical treatment tank below the outer edge of the annular reflux plate. The annular water distribution assembly is connected to the water pump assembly. An annular aeration pipe is installed at the bottom of the biological treatment tank. The denitrification promotion mechanism is installed inside the biological treatment tank, and an auxiliary water distribution mechanism is provided on the denitrification promotion mechanism. The overflow outlet mechanism is installed at the top inside the biochemical treatment tank.

[0005] Wastewater is pumped into the annular water distribution assembly by the pumping unit. The wastewater in the annular water distribution assembly is sprayed upwards along the inner wall of the biological treatment tank. The annular aeration pipe aerates the upward flow of water. The water flow is reversed downwards after encountering the annular return plate. The air from the aeration continues to rise through the exhaust vents at the top of the biological treatment tank. The water flow converges at the center of the biological treatment tank and gradually flows downwards. After reaching the bottom of the biological treatment tank, it rises again with the upward flow from the annular water distribution assembly. Aerobic granular sludge continuously circulates, grows, and aggregates. The denitrification promoting mechanism provides hydraulic shear force through agitation, thereby controlling the particle size of the aerobic granular sludge. To improve the mass transfer performance of the granules, nitrification products are rapidly migrated from the aerobic layer to the anoxic layer of the aerobic granular sludge. An auxiliary water distribution mechanism is used to assist in water distribution and increase the water distribution position. Hydraulic shear force can also be provided through different water distribution directions. When hydraulic shear force is provided with different water distribution directions and positions, the denitrification promotion mechanism can continuously stir to increase hydraulic shear force and reduce the particle size of the aerobic granular sludge. If the particle size of the aerobic granular sludge already meets the requirements, the denitrification promotion mechanism can also stop rotating and stirring. The clear water in the upper layer rises with the sewage entering the biological treatment tank and then overflows and is discharged through the overflow effluent mechanism.

[0006] Furthermore, the pump assembly includes a booster pump, an inlet pipe, and an electric butterfly valve. The outlet of the booster pump is connected to one end of the inlet pipe, and an electric butterfly valve is connected in series on the inlet pipe. The other end of the inlet pipe is connected to an annular water distribution assembly. The inlet of the booster pump is connected to an external sewage source. Opening the electric butterfly valve controls the booster pump to operate, and the external sewage is pumped into the inlet pipe through the booster pump, and then sent into the annular water distribution assembly. The annular water distribution assembly discharges the sewage upward along the inner wall of the biological treatment tank from the bottom of the tank.

[0007] Furthermore, the denitrification promoting mechanism includes a stirring position lifting control component, a lifting horizontal plate, a hollow stirring shaft, a rotating drum, stirring blades, and a rotational power component. A lifting horizontal plate is installed on the top of the biological treatment tank via the stirring position lifting control component. A vertical hollow stirring shaft is rotatably mounted in the middle of the lifting horizontal plate, located at the center of the biological treatment tank. The rotational power component is connected to the top outer side of the hollow stirring shaft, and the bottom of the hollow stirring shaft is connected to the top opening of the rotating drum. Multiple stirring blades are arranged in a circular array on the outer periphery of the rotating drum. The rotational power component drives the hollow stirring shaft and the rotating drum to rotate, which in turn drives the stirring blades to rotate. The stirring blades agitate the wastewater in the biological treatment tank, providing hydraulic shear force and improving the mass transfer performance of the particles. The stirring position lifting control component is used to move the lifting horizontal plate up and down relative to the biological treatment tank, thereby changing the height of the stirring blades within the biological treatment tank and providing hydraulic shear force at different water layers.

[0008] Furthermore, the auxiliary water distribution mechanism includes a water supply hose, a flexible and rigid pipe joint, a rigid vertical pipe, a pipe support, a rotary joint, an auxiliary water distribution assembly, and a water distribution direction switching assembly. The top of the hollow stirring shaft is connected to the bottom of the rigid vertical pipe through a rotary joint. A pipe support is installed on the side of the rigid vertical pipe, and the bottom of the pipe support is fixed to the lifting horizontal plate. The top of the rigid vertical pipe is connected to one end of the water supply hose through a flexible and rigid pipe joint. The other end of the water supply hose is connected to the outlet of the lifting pump through an inlet pipe. An auxiliary water distribution assembly is installed on the rotating drum, and a water distribution direction switching assembly is installed on the outside of the hollow stirring shaft.

[0009] When the booster pump pumps water into the supply hose through the inlet pipe, the wastewater enters the rigid riser pipe through the flexible-rigid pipe joint, then enters the rotating drum through the rotary joint and hollow stirring shaft, and then is distributed into the biological treatment tank through the auxiliary water distribution assembly. The water distribution direction switching assembly can change the direction and position of the auxiliary water distribution assembly in the biological treatment tank. The rotary joint ensures that wastewater is delivered from the rigid riser pipe into the hollow stirring shaft without leakage, while not obstructing the rotation of the hollow stirring shaft.

[0010] Furthermore, the auxiliary water distribution assembly includes a blade water distribution port, a cylinder cover spray port, a water distribution reflector cone, an annular guide plate, and a cylinder cover. The cylinder cover is detachably installed at the bottom opening of the rotating cylinder. The center of the cylinder cover is connected to the top of the cylinder cover spray port. Each stirring blade is provided with a blade water distribution port at the end away from the rotating cylinder. The blade water distribution port is connected to the top of the rotating cylinder. A water distribution reflector cone is provided at the center of the bottom surface of the biochemical treatment tank. An annular guide plate is provided at the edge of the bottom surface of the biochemical treatment tank. The annular guide plate is located below the annular water distribution assembly. Wastewater entering the rotating drum can be distributed radially along the biological treatment tank through the blade water distribution ports on the stirring blades. At this time, the hydraulic shear force provided by the stirring blades is the strongest, which is suitable for cases where aerobic granular sludge is excessively agglomerated. Water can also be distributed downwards through the nozzles at the bottom of the drum cover. The water flow downwards through the nozzles encounters the water distribution reflector cone, which disperses and reflects the water flow. Then, it flows radially along the bottom of the biological treatment tank to the annular guide plate. Guided by the annular guide plate, it moves upwards along the inner wall of the biological treatment tank. The water flow here can effectively impact the sludge at the bottom of the biological treatment tank, preventing a large amount of agglomerated sludge from accumulating at the bottom of the biological treatment tank. The water distribution direction switching component is used to control the water in the rotating drum to be discharged from the nozzles on the drum cover or the blade water distribution ports.

[0011] Furthermore, the water distribution direction switching assembly includes a water distribution direction switching sleeve, a crossbar, a conical plug, a control column, and a switching electric telescopic rod. The water distribution direction switching sleeve is vertically slidably installed on the inner side of the rotating drum. The bottom of the water distribution direction switching sleeve is connected to the top of the conical plug through the crossbar. The conical plug is located directly above the water spray nozzle on the drum cover. The top edge of the water distribution direction switching sleeve is fixedly connected to the bottom of the control column. The control column is slidably connected to the column hole at the top of the rotating drum. The top of the control column is connected to the telescopic end at the bottom of the switching electric telescopic rod. The fixed end at the top of the switching electric telescopic rod is installed on the side of the hollow stirring shaft. When the electric telescopic rod is shortened, the water distribution direction switching sleeve is pulled upward inside the rotating drum by the control column. The rotating drum blocks the end of the blade water distribution port located inside the rotating drum, and the sewage inside the rotating drum can only be discharged downward from the spray nozzle of the drum cover. When the electric telescopic rod is extended, the water distribution direction switching sleeve is pushed downward inside the rotating drum by the control column. The water distribution direction switching sleeve drives the conical plug downward through the crossbar. The conical plug seals the top of the spray nozzle of the drum cover, and the water distribution direction switching sleeve no longer blocks the end of the blade water distribution port. The sewage inside the rotating drum is discharged through the blade water distribution port inside the stirring blade.

[0012] Furthermore, the overflow mechanism includes an annular baffle, a drainage notch, an annular overflow weir, an outlet pipe, and a second flexible connector. An annular baffle is located on top of the annular return plate. The annular area between the top of the biochemical treatment tank and the annular baffle forms a clear water chamber. The top of the annular baffle has an annular array of drainage notches. An annular overflow weir is installed on the outer side of the top of the annular baffle. One end of the outlet pipe is connected to the clear water chamber, and the second flexible connector is connected in series with the outlet pipe. The clear water in the upper layer of the biochemical treatment tank flows through the drainage notch on the annular baffle as the water level rises, and then overflows into the clear water chamber through the gaps in the overflow teeth at the top of the annular overflow weir. The clear water in the clear water chamber is discharged through the outlet pipe. The second flexible connector is used to compensate for the displacement and deformation of the outlet pipe caused by the impact of the internal water flow.

[0013] Furthermore, it also includes a variable three-phase separation mechanism, which comprises a fixed annular air passage, a fixed inverted V-shaped plate, a movable annular air passage, a movable inverted V-shaped plate, and a plate lifting control assembly. The fixed annular air passage is installed on the inner side of the annular partition. Multiple fixed inverted V-shaped plates are arranged laterally at equal intervals on the inner side of the fixed annular air passage. The ends of the fixed inverted V-shaped plates are connected to the inner side of the fixed annular air passage through air holes. The top of the fixed annular air passage is connected to the movable annular air passage through the plate lifting control assembly. Multiple movable inverted V-shaped plates are arranged laterally at equal intervals on the bottom inner side of the movable annular air passage. The ends of the movable inverted V-shaped plates are connected to the inner side of the movable annular air passage through through slots. Each movable inverted V-shaped plate is located above two adjacent fixed inverted V-shaped plates.

[0014] After aeration, the rising air collects within the fixed and movable inverted V-shaped plates. The air in the fixed inverted V-shaped plate enters the fixed annular air channel through air holes, while the air in the movable inverted V-shaped plate enters the movable annular air channel through a passageway. Exhaust pipes are connected to the tops of the fixed and movable inverted V-shaped plates to discharge this air. Clean water rises through the gap between the fixed and movable inverted V-shaped plates, while aerobic granular sludge remains below them, achieving separation of the gas, liquid, and solid phases. The plate lifting and adjusting component is used to move the movable annular air channel and the movable inverted V-shaped plate up and down, thereby controlling the size of the gap between the fixed and movable inverted V-shaped plates and effectively separating the clean water and aerobic granular sludge.

[0015] Furthermore, the annular aeration pipe includes an annular aeration pipe, aeration heads, and an aeration power source. The annular aeration pipe is installed at the bottom of the biological treatment tank, and aeration heads are arranged in a circular array on the annular aeration pipe. One end of the annular aeration pipe is connected to an air supply pipe, and the other end of the air supply pipe is connected to the aeration power source. The aeration power source supplies air into the annular aeration pipe, and the air is dispersed and aerated through the aeration heads, which helps the oxygen in the air remain in the wastewater in the biological treatment tank, promoting the formation of aerobic granular sludge.

[0016] Furthermore, it also includes a sludge discharge mechanism, which comprises a sludge discharge pipe, an electric gate valve, and a manual gate valve. The sludge discharge pipe is inserted into the side of the biological treatment tank, with one end of the sludge discharge pipe located below the annular reflux plate inside the biological treatment tank. An electric gate valve and a manual gate valve are connected in series on the sludge discharge pipe. When sludge discharge is required, the electric and manual gate valves can be opened, allowing the upper layer of sludge with poor settling properties to be discharged through the sludge discharge pipe.

[0017] Compared with existing technologies, the beneficial effects of this continuous flow aerobic granular sludge biochemical system are: 1. In this continuous flow aerobic granular sludge biological treatment system, the pumping assembly pumps wastewater into the annular water distribution assembly. The wastewater in the annular water distribution assembly is sprayed upward along the inner wall of the biological treatment tank. The annular aeration pipe aerates the upward water flow. After encountering the annular return plate, the water flow turns back downward. The air during aeration continues to float upward at the top of the biological treatment tank through the exhaust vent. The water flow gathers in the center of the biological treatment tank and gradually flows downward. After flowing to the bottom of the biological treatment tank, it will rise again with the upward water flow of the annular water distribution assembly. The aerobic granular sludge continuously circulates, grows, and aggregates. The denitrification promotion mechanism provides hydraulic shear force by stirring, thereby controlling the particle size of the aerobic granular sludge.

[0018] 2. In this continuous flow aerobic granular sludge biological treatment system, the auxiliary water distribution mechanism is used to assist in water distribution and increase the water distribution position. Hydraulic shear force can also be provided by different water distribution directions. When hydraulic shear force is provided with different water distribution directions and positions, the denitrification promotion mechanism can continuously stir to increase hydraulic shear force and reduce the particle size of aerobic granular sludge. If the particle size of aerobic granular sludge already meets the requirements, the denitrification promotion mechanism can also be stopped from rotating and stirring.

[0019] 3. This continuous flow aerobic granular sludge biological treatment system, by distributing water at different locations and in different directions, combined with the stirring of the water by the stirring blades in the denitrification promotion mechanism, enhances the hydraulic shear force and improves the mass transfer performance of the granules. This allows nitrification products to migrate rapidly from the aerobic layer to the anoxic layer of the aerobic granular sludge, while simultaneously allowing carbon sources to quickly enter the anoxic layer. This prevents nitrogen accumulation on the granule surface, improves the overall denitrification rate, and is beneficial for improving the treatment effect of wastewater. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the continuous flow aerobic granular sludge biochemical system of the present invention; Figure 2 For the present invention Figure 1 A magnified view of the structure at point A in the middle; Figure 3 This is a schematic diagram of the internal structure of the continuous flow aerobic granular sludge biochemical system of the present invention; Figure 4 This is a schematic diagram of the vertical cross-sectional structure of the continuous flow aerobic granular sludge biochemical system of the present invention; Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at point B in the middle; Figure 6 For the present invention Figure 4 A magnified schematic diagram of the structure at point C in the middle; Figure 7 This is a partial structural schematic diagram of the water supply and distribution mechanism of the treatment tank in the continuous flow aerobic granular sludge biochemical system of the present invention. Figure 8 This is a partial structural diagram of the denitrification promotion mechanism and the auxiliary water distribution mechanism in the continuous flow aerobic granular sludge biochemical system of the present invention; Figure 9 This is a schematic diagram of the sludge discharge mechanism in the continuous flow aerobic granular sludge biochemical system of the present invention; In the diagram: 1. Biological treatment tank; 2. Water supply and distribution mechanism for the treatment tank; 21. Lift pump; 22. Tee; 23. Inlet pipe; 24. Electric butterfly valve; 25. Flexible joint one; 26. Annular water distribution pipe; 27. Pipe water distribution port; 3. Aeration mechanism for the treatment tank; 31. Annular aeration pipe; 32. Aeration head; 33. Air supply pipe; 34. Corrugated compensator; 35. Blower; 36. Pressure transmitter; 37. Thermal flow meter; 4. Denitrification promotion mechanism; 41. Rod seat; 42. Lifting electric telescopic rod; 43. Lifting horizontal plate; 44. Tapered roller bearing; 45. Hollow stirring shaft; 46. Rotary drum; 47. Stirring blades; 48. Gear one; 49. Promotion motor; 410. Gear two; 5. Auxiliary water distribution mechanism; 51. Water supply hose; 52. Flexible and rigid pipe joint; 53. Rigid vertical pipe; 54. Pipe support; 55. Rotary joint; 56. Blade water distribution port; 57. Removal bolt; 58. Cylinder cover spray nozzle. 59 Water distribution direction switching sleeve, 510 crossbar, 511 conical plug, 512 control column, 513 connecting sleeve, 514 mounting sleeve, 515 switching electric telescopic rod, 516 conductive slip ring, 517 slip ring bend, 518 water distribution reflector cone, 519 annular guide plate, 520 cylinder cover, 6 overflow outlet mechanism, 61 annular baffle, 62 drainage notch, 63 annular overflow weir, 64 outlet pipe, 65 flexible joint II, 7 variable three-phase separation mechanism, 71 fixed annular air passage, 72 fixed inverted V-shaped plate, 73 movable annular air passage, 74 movable inverted V-shaped plate, 75 bent rod, 76 adjusting column, 77 adjusting nut, 8 sludge discharge mechanism, 81 sludge discharge pipe, 82 electric gate valve, 83 flexible joint III, 84 manual gate valve, 9 treatment tank emptying mechanism, 91 emptying pipe, 92 emptying valve, 10 annular return plate, 11 exhaust notch. Detailed Implementation

[0021] 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.

[0022] Example 1, please refer to Figures 1 to 9 This embodiment provides a technical solution: a continuous flow aerobic granular sludge biochemical system, including a biochemical treatment tank 1, and also including an annular reflux plate 10, a water supply and distribution mechanism 2 for the treatment tank, an annular aeration pipe 3, a denitrification promotion mechanism 4, an auxiliary water distribution mechanism 5, and an overflow effluent mechanism 6.

[0023] An annular reflux plate 10 is installed on the inner wall of the biochemical treatment tank 1. The cross-section of the annular reflux plate 10 is an arched structure, and an exhaust vent 11 is provided in the annular array on the inner side of the annular reflux plate 10.

[0024] The water supply and distribution mechanism 2 of the treatment tank includes a pump assembly and an annular water distribution assembly. The annular water distribution assembly is installed at the bottom of the biochemical treatment tank 1 below the outer edge of the annular reflux plate 10. The annular water distribution assembly is connected to the pump assembly.

[0025] The pump assembly includes a booster pump 21, an inlet pipe 23, and an electric butterfly valve 24. The outlet of the booster pump 21 is connected to one end of the inlet pipe 23, and the electric butterfly valve 24 is connected in series on the inlet pipe 23. The other end of the inlet pipe 23 is connected to an annular water distribution assembly. The inlet of the booster pump 21 is connected to an external sewage source. When the electric butterfly valve 24 is opened, the booster pump 21 is controlled to work, and the external sewage is pumped into the inlet pipe 23 through the booster pump 21, and then sent into the annular water distribution assembly. The annular water distribution assembly discharges the sewage upward along the inner wall of the biological treatment tank 1 from the bottom.

[0026] The annular water distribution assembly includes an annular water distribution pipe 26 and a water distribution port 27. The annular water distribution pipe 26 is located at the bottom of the biochemical treatment tank 1, below the outer edge of the annular reflux plate 10. The top of the annular water distribution pipe 26 is arranged in an annular array with water distribution ports 27. The annular water distribution pipe 26 is connected to the inlet pipe 23. The sewage in the inlet pipe 23 enters the annular water distribution pipe 26 and is then discharged upward through the water distribution port 27 to complete the water distribution operation.

[0027] The annular aeration pipe 3 is installed at the bottom of the biochemical treatment tank 1.

[0028] The annular aeration pipe 3 includes an annular aeration pipe 31, aeration heads 32, an air supply pipe 33, and an aeration power source. The annular aeration pipe 31 is installed at the bottom of the biological treatment tank 1. Aeration heads 32 are arranged in a circular array on the annular aeration pipe 31. One end of the annular aeration pipe 31 is connected to the air supply pipe 33, and the other end of the air supply pipe 33 is connected to the aeration power source. The aeration power source supplies air into the annular aeration pipe 31. The air is dispersed and aerated through the aeration heads 32, which helps the oxygen in the air remain in the wastewater within the biological treatment tank 1, promoting the formation of aerobic granular sludge.

[0029] The aeration power source is a blower 35, and the air outlet of the blower 35 is connected to the end of the air supply pipe 33.

[0030] The annular aeration pipe 3 also includes a corrugated compensator 34, a pressure transmitter 36, and a thermal flow meter 37. The air supply pipe 33 located outside the biochemical treatment tank 1 is connected in series with the corrugated compensator 34, the pressure transmitter 36, and the thermal flow meter 37. The corrugated compensator 34 is used to compensate for the deformation of the air supply pipe 33 caused by the airflow impact, the pressure transmitter 36 is used to measure the air pressure, and the thermal flow meter 37 is used to measure the air flow.

[0031] The denitrification promotion mechanism 4 is installed inside the biological treatment tank 1, and an auxiliary water distribution mechanism 5 is provided on the denitrification promotion mechanism 4.

[0032] The denitrification promoting mechanism 4 includes a stirring position lifting control component, a lifting horizontal plate 43, a tapered roller bearing 44, a hollow stirring shaft 45, a rotating drum 46, stirring blades 47, and a rotational power component. The lifting horizontal plate 43 is installed on the top of the biochemical treatment tank 1 through the stirring position lifting control component. The vertical hollow stirring shaft 45 is rotatably installed in the middle of the lifting horizontal plate 43 through the tapered roller bearing 44. The hollow stirring shaft 45 is located at the center of the biochemical treatment tank 1, and the rotational power component is connected to the top outer side of the hollow stirring shaft 45. The bottom of the hollow stirring shaft 45 is connected to the top opening of the rotating drum 46. Multiple stirring blades 47 are arranged in a ring array on the outer periphery of the rotating drum 46. Specifically, there are four stirring blades 47.

[0033] The stirring position lifting control assembly includes a rod base 41 and lifting electric telescopic rods 42. The four corners of the lifting horizontal plate 43 are respectively fixedly connected to the telescopic ends of the top of the four lifting electric telescopic rods 42. The bottoms of the four lifting electric telescopic rods 42 are respectively fixedly connected to the top outer side of the biochemical treatment tank 1 through the rod base 41. The synchronous lifting of the four lifting electric telescopic rods 42 can drive the lifting horizontal plate 43 to move up and down relative to the biochemical treatment tank 1.

[0034] The rotary power assembly includes a first gear 48, a facilitator motor 49, and a second gear 410. The first gear 48 is mounted on the top outer side of the hollow stirring shaft 45, and the facilitator motor 49 is mounted on the lifting cross plate 43. The second gear 410 is mounted on the output shaft of the facilitator motor 49. The second gear 410 meshes with the first gear 48. When the facilitator motor 49 works, it drives the hollow stirring shaft 45 to rotate through the transmission of the first gear 48 and the second gear 410.

[0035] The rotating power assembly drives the hollow stirring shaft 45 and the rotating drum 46 to rotate. The rotating drum 46 drives the stirring blades 47 to rotate. The stirring blades 47 agitate the sewage in the biological treatment tank 1, providing hydraulic shear force and improving the mass transfer performance of the particles. The stirring position lifting control assembly is used to drive the lifting plate 43 to move up and down relative to the biological treatment tank 1, thereby changing the height of the stirring blades 47 in the biological treatment tank 1, which can provide hydraulic shear force at different water layers.

[0036] The auxiliary water distribution mechanism 5 includes a water supply hose 51, a flexible and rigid pipe joint 52, a rigid vertical pipe 53, a pipe support 54, a rotary joint 55, an auxiliary water distribution component, and a water distribution direction switching component. The top of the hollow stirring shaft 45 is connected to the bottom of the rigid vertical pipe 53 through the rotary joint 55. The pipe support 54 is installed on the side of the rigid vertical pipe 53. The bottom of the pipe support 54 is fixed to the lifting horizontal plate 43 with screws. The top of the rigid vertical pipe 53 is connected to one end of the water supply hose 51 through the flexible and rigid pipe joint 52. The other end of the water supply hose 51 is connected to the outlet of the lifting pump 21 through the water inlet pipe 23. The auxiliary water distribution component is installed on the rotating drum 46, and the water distribution direction switching component is installed on the outside of the hollow stirring shaft 45.

[0037] Specifically, the outlet of the booster pump 21 is connected to the inlet of the tee 22. The two outlets of the tee 22 are connected to one end of two inlet pipes 23. One inlet pipe 23 is connected to the annular water distribution assembly, and the other inlet pipe 23 is connected to the water supply hose 51. Electric butterfly valves 24 are connected in series on the two inlet pipes 23. The booster pump 21 can be controlled to pump water into the annular water distribution assembly and the water supply hose 51 through the two electric butterfly valves 24. In addition, a flexible joint 25 is also included. A flexible joint 25 is connected in series on each inlet pipe 23. The flexible joint 25 is used to compensate for the displacement and deformation of the inlet pipe 23 caused by the impact of water flow.

[0038] When the booster pump 21 pumps water into the water supply hose 51 through the inlet pipe 23, the sewage enters the rigid riser pipe 53 through the flexible-rigid pipe joint 52, then enters the rotating drum 46 through the rotary joint 55 and the hollow stirring shaft 45, and then is distributed into the biological treatment tank 1 through the auxiliary water distribution assembly. The water distribution direction switching assembly can change the direction and position of the auxiliary water distribution assembly in the biological treatment tank 1. Among them, the rotary joint 55 ensures that the sewage is sent from the rigid riser pipe 53 into the hollow stirring shaft 45 without leakage, and does not hinder the rotation of the hollow stirring shaft 45.

[0039] The auxiliary water distribution assembly includes blade water distribution inlets 56, disassembly bolts 57, cylinder cover spray nozzles 58, water distribution reflector cones 518, annular guide plates 519, and cylinder cover 520. The cylinder cover 520 is detachably installed at the bottom opening of the rotating cylinder 46 through six disassembly bolts 57. The center of the cylinder cover 520 is connected to the top of the cylinder cover spray nozzles 58. The bottom of the cylinder cover spray nozzles 58 has a conical structure. Each stirring blade 47 is provided with a blade water distribution inlet 56 at the end away from the rotating cylinder 46. The blade water distribution inlet 56 is connected to the top of the rotating cylinder 46. A water distribution reflector cone 518 is provided at the center of the bottom surface of the biochemical treatment tank 1. An annular guide plate 519 is provided at the edge of the bottom surface of the biochemical treatment tank 1. The annular guide plate 519 is located below the annular water distribution assembly. Wastewater entering the rotating drum 46 can be distributed radially along the biological treatment tank 1 through the blade water distribution port 56 on the stirring blade 47. At this time, the hydraulic shear force provided by the stirring blade 47 is the strongest, which is suitable for the case of excessive aerobic granular sludge agglomeration. Water can also be distributed downward through the cover spray port 58 at the bottom of the cover 520. The water flow downward through the cover spray port 58 meets the water distribution reflector cone 518 and is dispersed and reflected by the water distribution reflector cone 518. Then, it flows radially along the bottom of the biological treatment tank 1 to the annular guide plate 519. After being guided by the annular guide plate 519, it moves upward along the inner wall of the biological treatment tank 1. The water flow here can effectively impact the sludge at the bottom of the biological treatment tank 1, avoiding the deposition of a large amount of agglomerated sludge at the bottom of the biological treatment tank 1. The water distribution direction switching component is used to control the water in the rotating drum 46 to be discharged from the cover spray port 58 or the blade water distribution port 56.

[0040] The water distribution direction switching assembly includes a water distribution direction switching sleeve 59, a crossbar 510, a conical plug 511, a control column 512, and a switching electric telescopic rod 515. The water distribution direction switching sleeve 59 is vertically slidably installed on the inner side of the rotating drum 46. The bottom of the water distribution direction switching sleeve 59 is connected to the top of the conical plug 511 through the crossbar 510. The conical plug 511 is located directly above the water spray nozzle 58 on the drum cover. The top edge of the water distribution direction switching sleeve 59 is fixedly connected to the bottom of the control column 512. The control column 512 is slidably connected to the column hole at the top of the rotating drum 46. The top of the control column 512 is connected to the telescopic end at the bottom of the switching electric telescopic rod 515. The fixed end at the top of the switching electric telescopic rod 515 is installed on the side of the hollow stirring shaft 45. The switching electric telescopic rod 515 is located below the lifting horizontal plate 43.

[0041] Specifically, the water distribution direction switching component also includes a connecting sleeve 513 and an mounting sleeve 514. The top of the control column 512 is connected to the telescopic end of the bottom of the switching electric telescopic rod 515 through the connecting sleeve 513, and the fixed end of the top of the switching electric telescopic rod 515 is connected to the side of the hollow stirring shaft 45 through the mounting sleeve 514.

[0042] A conductive slip ring 516 and a slip ring bend 517 are also provided. The conductive slip ring 516 is installed at the position between the switching electric telescopic rod 515 and the lifting horizontal plate 43 on the hollow stirring shaft 45. The slip ring bend 517 is installed on the side of the conductive slip ring 516 and is fixed to the bottom of the lifting horizontal plate 43 by screws. Since the switching electric telescopic rod 515 needs to rotate with the hollow stirring shaft 45, the cable controlling the extension and retraction of the switching electric telescopic rod 515 will have problems. Therefore, the conductive slip ring 516 is provided. The conductive slip ring adopts existing technology and is also called an electric slip ring. It is an electrical component that realizes continuous transmission of power and signals in rotating equipment. It can control the extension and retraction of the switching electric telescopic rod 515 when it rotates with the hollow stirring shaft 45. The cable connection between the conductive slip ring 516 and the switching electric telescopic rod 515 adopts existing technology.

[0043] When the electric telescopic rod 515 is shortened, the water distribution direction switching sleeve 59 is pulled upward within the rotating drum 46 by the control column 512. The rotating drum 46 blocks one end of the blade water distribution port 56 located inside the rotating drum 46, and the sewage in the rotating drum 46 can only be discharged downward from the nozzle 58 of the drum cover. When the electric telescopic rod 515 is extended, the water distribution direction switching sleeve 59 is pushed downward within the rotating drum 46 by the control column 512. The water distribution direction switching sleeve 59 drives the conical plug 511 downward through the crossbar 510. The conical plug 511 seals the top of the nozzle 58 of the drum cover, and the water distribution direction switching sleeve 59 no longer blocks the end of the blade water distribution port 56. The sewage in the rotating drum 46 is discharged through the blade water distribution port 56 in the stirring blade 47.

[0044] The overflow outlet mechanism 6 is installed at the top inside the biochemical treatment tank 1.

[0045] The overflow mechanism 6 includes an annular baffle 61, a drainage notch 62, an annular overflow weir 63, an outlet pipe 64, and a flexible connector 65. The annular baffle 61 is located on the top of the annular return plate 10. The annular area between the top of the biochemical treatment tank 1 and the annular baffle 61 is a clear water chamber. The top of the annular baffle 61 has an annular array of drainage notches 62. An annular overflow weir 63 is installed on the outer side of the top of the annular baffle 61. One end of the outlet pipe 64 is connected to the clear water chamber, and a flexible connector 65 is connected in series on the outlet pipe 64. The clear water in the upper layer of the biochemical treatment tank 1 flows through the drainage notch 62 on the annular baffle 61 as the water level rises, and then overflows into the clear water chamber through the gaps in the overflow teeth at the top of the annular overflow weir 63. The clear water in the clear water chamber is discharged through the outlet pipe 64. The flexible connector 65 is used to compensate for the displacement and deformation of the outlet pipe 64 caused by the impact of the internal water flow.

[0046] The treatment tank is also equipped with a treatment tank emptying mechanism 9, which includes an emptying pipe 91 and an emptying valve 92. The bottom of the biochemical treatment tank 1 is connected to the emptying pipe 91, and the emptying valve 92 is installed on the emptying pipe 91. When it is necessary to empty the inside of the biochemical treatment tank 1, the emptying valve 92 can be opened, and the sewage and sludge of the biochemical treatment tank 1 can be discharged through the emptying pipe 91.

[0047] During operation, the pump assembly pumps wastewater into the annular water distribution assembly. The wastewater in the annular water distribution assembly sprays upwards along the inner wall of the biological treatment tank 1. The annular aeration pipe 3 aerates the upward water flow. After encountering the annular return plate 10, the water flow turns back downwards. The air from the aeration continues to rise at the top of the biological treatment tank 1 through the exhaust vent 11. The water flow gathers at the center of the biological treatment tank 1 and gradually flows downwards. After reaching the bottom of the biological treatment tank 1, it rises again with the upward water flow from the annular water distribution assembly. The aerobic granular sludge continuously circulates, grows, and aggregates. The denitrification promotion mechanism 4 provides hydraulic shear force through stirring, thereby controlling the aerobic granular sludge. The particle size is adjusted to improve the mass transfer performance of the particles, allowing nitrification products to migrate rapidly from the aerobic layer to the anoxic layer of the aerobic granular sludge. The auxiliary water distribution mechanism 5 is used to assist in water distribution and increase the water distribution position. Hydraulic shear force can also be provided through different water distribution directions. When hydraulic shear force is provided with different water distribution directions and positions, the denitrification promotion mechanism 4 can continuously stir to increase hydraulic shear force and reduce the particle size of the aerobic granular sludge. If the particle size of the aerobic granular sludge already meets the requirements, the denitrification promotion mechanism 4 can also stop rotating and stirring. The clear water in the upper layer rises with the sewage entering the biological treatment tank 1 and then overflows and is discharged through the overflow outlet mechanism 6.

[0048] Example 2, please refer to Figures 1 to 9 This embodiment provides a technical solution: a continuous flow aerobic granular sludge biochemical system. This embodiment has a roughly the same structure as Embodiment 1, the difference being: A variable three-phase separation mechanism 7 is also provided. The variable three-phase separation mechanism 7 includes a fixed annular air passage 71, a fixed inverted V-shaped plate 72, a movable annular air passage 73, a movable inverted V-shaped plate 74, and a plate lifting control assembly. The fixed annular air passage 71 is installed on the inner side of the annular partition 61. Multiple fixed inverted V-shaped plates 72 are arranged horizontally at equal intervals on the inner side of the fixed annular air passage 71. The ends of the fixed inverted V-shaped plates 72 are connected to the inner side of the fixed annular air passage 71 through air holes. The top of the fixed annular air passage 71 is connected to the movable annular air passage 73 through the plate lifting control assembly. Multiple movable inverted V-shaped plates 74 are arranged horizontally at equal intervals on the bottom inner side of the movable annular air passage 73. The ends of the movable inverted V-shaped plates 74 are connected to the inner side of the movable annular air passage 73 through through slots. Each movable inverted V-shaped plate 74 is located above two adjacent fixed inverted V-shaped plates 72.

[0049] Specifically, there are six fixed inverted V-shaped plates 72 and five movable inverted V-shaped plates 74. The middle movable inverted V-shaped plate 74 has an anti-interference groove in the middle, through which the hollow stirring shaft 45 and the control column 512 pass.

[0050] The plate lifting control assembly includes a bent rod 75, an adjusting column 76, and an adjusting nut 77. Two vertical adjusting columns 76 are installed on the top sides of the annular air passage 71, and two bent rods 75 are installed on the top sides of the movable annular air passage 73. The two adjusting columns 76 pass through the adjusting holes on the two bent rods 75 respectively. Two adjusting nuts 77 are threaded to the upper and lower sides of the adjusting hole of each adjusting column 76. By twisting the two adjusting nuts 77 on the adjusting column 76, the relative height between the bent rod 75 and the adjusting column 76 can be changed, thereby adjusting the gap between the fixed inverted V-shaped plate 72 and the movable inverted V-shaped plate 74.

[0051] The plate lifting control assembly can also use two vertical electric telescopic rods, which can drive the movable annular air passage 73 and the movable inverted V-shaped plate 74 to move up and down in an electric control manner. Specifically, the bottom end of the electric telescopic rod is installed on the fixed annular air passage 71, and the top end of the electric telescopic rod is connected to the movable annular air passage 73.

[0052] After aeration, the rising air collects within the fixed inverted V-shaped plate 72 and the movable inverted V-shaped plate 74. The air in the fixed inverted V-shaped plate 72 enters the fixed annular air channel 71 through the air holes, while the air in the movable inverted V-shaped plate 74 enters the movable annular air channel 73 through the through groove. The tops of the fixed inverted V-shaped plate 72 and the movable annular air channel 73 are connected to exhaust pipes to discharge this air. Clean water rises through the gap between the fixed inverted V-shaped plate 72 and the movable inverted V-shaped plate 74, while aerobic granular sludge remains below the fixed inverted V-shaped plate 72 and the movable inverted V-shaped plate 74, achieving separation of the gas, liquid, and solid phases. The plate lifting and adjusting component is used to drive the movable annular air channel 73 and the movable inverted V-shaped plate 74 up and down, thereby controlling the size of the gap between the fixed inverted V-shaped plate 72 and the movable inverted V-shaped plate 74, allowing the clean water and aerobic granular sludge to be effectively separated.

[0053] Example 3, please refer to Figures 1 to 9 This embodiment provides a technical solution: a continuous flow aerobic granular sludge biochemical system. This embodiment is structurally similar to Embodiment 2, with the difference being: A sludge discharge mechanism 8 is also provided. The sludge discharge mechanism 8 includes a sludge discharge pipe 81, an electric gate valve 82, and a manual gate valve 84. The sludge discharge pipe 81 is inserted through the side of the biochemical treatment tank 1. One end of the sludge discharge pipe 81 is located below the annular reflux plate 10 inside the biochemical treatment tank 1. The electric gate valve 82 and the manual gate valve 84 are connected in series on the sludge discharge pipe 81.

[0054] The mud discharge mechanism 8 also includes a flexible joint 83. The flexible joint 83 is connected in series on the mud discharge pipe 81. The flexible joint 83 is used to compensate for the deformation and displacement of the mud discharge pipe 81 when it is impacted.

[0055] When sludge needs to be discharged, the electric gate valve 82 and the manual gate valve 84 can be opened, and the sludge with poor settling performance in the upper layer can be discharged through the sludge discharge pipe 81.

[0056] It is worth noting that the lifting pump 21, electric butterfly valve 24, blower 35, lifting electric telescopic rod 42, facilitator motor 49, switching electric telescopic rod 515 and electric gate valve 82 disclosed in the above embodiments are all controlled by an external PLC controller, and the control method adopts the method commonly used in the prior art.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0058] 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. A continuous flow aerobic granular sludge biochemical system, comprising a biochemical treatment tank (1), characterized in that, Also includes: An annular reflux plate (10) is installed on the inner wall of the biochemical treatment tank (1), and an exhaust vent (11) is provided on the inner annular array of the annular reflux plate (10). The water supply and distribution mechanism (2) of the treatment tank includes a pump assembly and an annular water distribution assembly. The annular water distribution assembly is installed at the bottom of the biochemical treatment tank (1) below the outer edge of the annular reflux plate (10). The annular water distribution assembly is connected to the pump assembly. A ring-shaped aeration pipe (3) is installed at the bottom of the biochemical treatment tank (1); The denitrification promotion mechanism (4) is installed in the biochemical treatment tank (1), and the denitrification promotion mechanism (4) is equipped with an auxiliary water distribution mechanism (5). An overflow outlet mechanism (6) is installed at the top inside the biochemical treatment tank (1).

2. The continuous flow aerobic granular sludge biochemical system according to claim 1, characterized in that: The water pump assembly includes a booster pump (21), an inlet pipe (23), and an electric butterfly valve (24). The outlet of the booster pump (21) is connected to one end of the inlet pipe (23). An electric butterfly valve (24) is connected in series on the inlet pipe (23). The other end of the inlet pipe (23) is connected to an annular water distribution assembly.

3. The continuous flow aerobic granular sludge biochemical system according to claim 2, characterized in that: The denitrification promoting mechanism (4) includes a stirring position lifting control component, a lifting horizontal plate (43), a hollow stirring shaft (45), a rotating drum (46), stirring blades (47), and a rotation power component. The top of the biochemical treatment tank (1) is equipped with a lifting horizontal plate (43) through the stirring position lifting control component. A vertical hollow stirring shaft (45) is rotatably installed in the middle of the lifting horizontal plate (43). The hollow stirring shaft (45) is located in the center of the biochemical treatment tank (1), and the top outer side of the hollow stirring shaft (45) is connected to the rotation power component. The bottom of the hollow stirring shaft (45) is connected to the top opening of the rotating drum (46). Multiple stirring blades (47) are arranged in a ring array on the outer periphery of the rotating drum (46).

4. The continuous flow aerobic granular sludge biochemical system according to claim 3, characterized in that: The auxiliary water distribution mechanism (5) includes a water supply hose (51), a flexible and rigid pipe joint (52), a rigid vertical pipe (53), a pipe support (54), a rotary joint (55), an auxiliary water distribution component, and a water distribution direction switching component. The top of the hollow stirring shaft (45) is connected to the bottom of the rigid vertical pipe (53) through the rotary joint (55). The side of the rigid vertical pipe (53) is equipped with a pipe support (54). The bottom of the pipe support (54) is fixed on the lifting horizontal plate (43). The top of the rigid vertical pipe (53) is connected to one end of the water supply hose (51) through the flexible and rigid pipe joint (52). An auxiliary water distribution component is installed on the rotating drum (46), and a water distribution direction switching component is installed on the outside of the hollow stirring shaft (45).

5. The continuous flow aerobic granular sludge biochemical system according to claim 4, characterized in that: The auxiliary water distribution assembly includes a blade water distribution port (56), a cylinder cover spray port (58), a water distribution reflector cone (518), an annular guide plate (519), and a cylinder cover (520). The cylinder cover (520) is detachably installed at the bottom opening of the rotating cylinder (46). The center of the cylinder cover (520) is connected to the top of the cylinder cover spray port (58). Each stirring blade (47) is provided with a blade water distribution port (56) at one end away from the rotating cylinder (46). The blade water distribution port (56) is connected to the top of the rotating cylinder (46). A water distribution reflector cone (518) is provided at the center of the bottom surface of the biochemical treatment tank (1). An annular guide plate (519) is provided at the edge of the bottom surface of the biochemical treatment tank (1). The annular guide plate (519) is located below the annular water distribution assembly.

6. The continuous flow aerobic granular sludge biochemical system according to claim 5, characterized in that: The water distribution direction switching assembly includes a water distribution direction switching sleeve (59), a crossbar (510), a conical plug (511), a control column (512), and a switching electric telescopic rod (515). The water distribution direction switching sleeve (59) is vertically slidably installed on the inner side of the rotating drum (46). The bottom of the water distribution direction switching sleeve (59) is connected to the top of the conical plug (511) through the crossbar (510). The conical plug (511) is located directly above the water spray nozzle (58) of the drum cover. The top edge of the water distribution direction switching sleeve (59) is fixedly connected to the bottom of the control column (512). The control column (512) is slidably connected to the column hole at the top of the rotating drum (46). The top of the control column (512) is connected to the telescopic end at the bottom of the switching electric telescopic rod (515). The fixed end at the top of the switching electric telescopic rod (515) is installed on the side of the hollow stirring shaft (45).

7. The continuous flow aerobic granular sludge biochemical system according to claim 1, characterized in that: The overflow outlet mechanism (6) includes an annular baffle (61), a drainage gap (62), an annular overflow weir (63), an outlet pipe (64), and a second flexible connector (65). The top of the annular return plate (10) is provided with an annular baffle (61). The annular area between the top of the biochemical treatment tank (1) and the annular baffle (61) is a clear water chamber. The top of the annular baffle (61) is provided with a drainage gap (62) in an annular array. An annular overflow weir (63) is installed on the outer side of the top of the annular baffle (61). The clear water chamber is connected to one end of the outlet pipe (64), and a second flexible connector (65) is connected in series on the outlet pipe (64).

8. The continuous flow aerobic granular sludge biochemical system according to claim 7, characterized in that: It also includes a variable three-phase separation mechanism (7), which includes a fixed annular air passage (71). The fixed annular air passage (71) is installed on the inner side of the annular partition (61). Multiple fixed inverted V-shaped plates (72) are arranged horizontally at equal intervals on the inner side of the fixed annular air passage (71). The ends of the fixed inverted V-shaped plates (72) are connected to the inner side of the fixed annular air passage (71) through air holes. The top of the fixed annular air passage (71) is connected to a movable annular air passage (73) through a plate lifting control assembly. Multiple movable inverted V-shaped plates (74) are arranged horizontally at equal intervals on the bottom inner side of the movable annular air passage (73). The ends of the movable inverted V-shaped plates (74) are connected to the inner side of the movable annular air passage (73) through through slots. Each movable inverted V-shaped plate (74) is located above the two adjacent fixed inverted V-shaped plates (72).

9. The continuous flow aerobic granular sludge biochemical system according to claim 1, characterized in that: The annular aeration pipe (3) includes an annular aeration pipe (31), an aeration head (32) and an aeration power source. An annular aeration pipe (31) is installed at the bottom of the biochemical treatment tank (1). An aeration head (32) is arranged in an annular array on the annular aeration pipe (31). One end of the annular aeration pipe (31) is connected to the air supply pipe (33), and the other end of the air supply pipe (33) is connected to the aeration power source.

10. The continuous flow aerobic granular sludge biochemical system according to claim 1, characterized in that... It also includes a sludge discharge mechanism (8), which includes a sludge discharge pipe (81), an electric gate valve (82) and a manual gate valve (84). The sludge discharge pipe (81) is inserted through the side of the biochemical treatment tank (1). One end of the sludge discharge pipe (81) is located below the annular reflux plate (10) inside the biochemical treatment tank (1). The electric gate valve (82) and the manual gate valve (84) are connected in series on the sludge discharge pipe (81).

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