Sewage multi-stage treatment equipment

Abstract

The invention relates to the technical field of sewage treatment, in particular to sewage multi-stage treatment equipment which comprises a treatment pond, a flocculation pond, an aerobic pond and an anoxic pond are arranged in the treatment pond, a middle plate is fixedly connected to the middle of the inner side of the aerobic pond, the aerobic pond is divided into a main area and an auxiliary area through the middle plate, an upper aeration disc is arranged at the bottom of the main area, and a lower aeration disc is arranged at the bottom of the auxiliary area. An adjustable aeration mechanism is arranged at the bottom of the auxiliary area, the auxiliary area is filled with suspended filler, and a top groove is formed in the top end of the side wall of the middle plate in a penetrating mode. Parallel, serial or single-area operation modes of the main area and the auxiliary area can be flexibly selected according to the quality and quantity of inlet water, hydraulic load can be shared during parallel operation, hydraulic retention time can be prolonged during serial operation to realize deep treatment, and energy conservation and consumption reduction or non-stop maintenance can be realized during single-area operation. And the buffering capacity and the operation regulation and control flexibility of the system for dealing with load impact are obviously improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a multi-stage wastewater treatment device. Background Technology

[0002] Multi-stage wastewater treatment equipment is designed to address the complex composition and diverse types of water pollution. It employs a graded and synergistic treatment process to solve the problem of single treatment methods failing to consistently meet standards. The equipment is sequentially set up with an anaerobic treatment zone, an aerobic treatment zone, and a sludge-laden zone, forming a complete purification chain. Wastewater first enters the anaerobic zone, where hydrolysis and acidification break down large organic molecules into smaller molecules, while simultaneously releasing phosphorus biologically. It then enters the aerobic zone, where organic pollutants are degraded and ammonia nitrogen nitrification is completed under sufficient dissolved oxygen conditions. The treated mixed liquid passes through the sludge-laden zone to remove surface foam and light scum, and finally enters the sedimentation zone for sludge-water separation. The clarified water meets discharge standards, while the sludge is recycled or discharged.

[0003] Existing multi-stage wastewater treatment equipment typically only has a single aerobic zone with fixed treatment volume and aeration intensity. This makes it impossible to flexibly adjust according to fluctuations in influent water quality and flow rate. When faced with high-concentration organic load shocks, a single aerobic zone cannot buffer the impact by adjusting hydraulic retention time or staged degradation strategies, which can easily lead to decreased treatment efficiency and unstable effluent quality. Furthermore, during low-load operation or equipment maintenance, it is impossible to achieve energy saving and consumption reduction or uninterrupted operation through zone control, resulting in energy waste and operational interruptions. In addition, a single aerobic zone makes it difficult to achieve synergy or comparison of different aerobic treatment processes within the same device, limiting the flexibility of process optimization and emergency control, and making it difficult to adapt to the complex and ever-changing actual wastewater treatment needs.

[0004] Therefore, a multi-stage wastewater treatment device is proposed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the prior art by proposing a multi-stage wastewater treatment device.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a multi-stage wastewater treatment device, comprising a treatment tank, wherein the treatment tank is provided with a flocculation tank, an aerobic tank and an anoxic tank, a middle plate is fixedly connected to the middle of the inner side of the aerobic tank, the middle plate is used to separate the aerobic tank into a main zone and a secondary zone, an upper aeration disc is provided at the bottom of the main zone, an adjustable aeration mechanism is provided at the bottom of the secondary zone, the secondary zone is filled with suspended packing, a top groove is provided through the top of the side wall of the middle plate, a gate valve is fixedly connected to the inner side of the top groove, a filter screen is fixedly connected to the valve port of the gate valve, a flow guiding structure for guiding flow is provided in the main zone, a gate plate is longitudinally slidably connected to the gate valve, a threaded rod is rotatably connected through the top of the gate valve, and the threaded rod is threadedly connected to the inner side wall of the gate plate, a handwheel is fixedly connected to the top of the threaded rod.

[0007] In the above technical solution, a first front U-shaped pipe is fixedly connected between the front side of the main zone and the front side of the anoxic pool, and a second front U-shaped pipe is fixedly connected between the front side of the sub-zone and the front side of the anoxic pool. Both the first front U-shaped pipe and the second front U-shaped pipe are equipped with upper valves.

[0008] In the above technical solution, a first rear U-shaped pipe is fixedly connected through the rear side of the main zone and the rear side of the flocculation tank, and a second rear U-shaped pipe is fixedly connected through the rear side of the sub-zone and the rear side of the flocculation tank. Both the first and second rear U-shaped pipes are provided with a lower valve, and a filter cartridge is fixedly connected to the inner side of the sub-zone relative to the side wall of the second rear U-shaped pipe.

[0009] In the above technical solution, the flow guiding structure further includes an L-shaped rod, a pair of which are provided. The L-shaped rods are slidably connected to both sides of the top groove. Vertical grooves are provided on both sides of the outer wall of the gate valve. The L-shaped rods are slidably connected to the inner side of the vertical grooves. Several upper springs are fixedly connected between the top of the gate valve and the top of the L-shaped rods. A cavity is provided inside the treatment tank relative to the bottom of the middle plate. A rack is slidably connected to the inner side of the cavity. Several gears are rotatably connected to the inner side of the cavity. The gears mesh with the rack. A rotating shaft is fixedly connected to the top of each gear. The rotating shaft is rotatably connected to the bottom of the treatment tank. A side plate is fixedly connected to the top of each rotating shaft. The bottom of the L-shaped rods is provided through the inner side of the cavity.

[0010] In the above technical solution, the rack sidewall is provided with a side groove at the position below the L-shaped rod, the bottom end of the L-shaped rod is located inside the side groove, the side groove sidewall is provided with an inclined groove, and the L-shaped rod sidewall is fixedly connected to a side rod inserted into the inclined groove.

[0011] In the above technical solution, the aeration mechanism further includes an aeration pipe and an aeration cylinder. Three aeration cylinders are provided, all fixedly connected to the bottom of the sub-zone. The aeration pipe is fixedly connected through the rear side of the treatment tank. An air inlet pipe is fixedly connected through the top of the aeration pipe and the bottom of the aeration cylinder. A fixing ring is fixedly connected between the top of the inner end of the aeration cylinder and the outer wall of the air inlet pipe. Several central aeration holes are equidistantly opened at the top of the aeration cylinder relative to the position above the fixing ring. Several external aeration holes are equidistantly opened at the top of the aeration cylinder relative to the outer side of the fixing ring. A central pipe is provided inside the air inlet pipe. Several side pipes are fixedly connected at equal intervals to the outer wall of the central pipe. The side walls of the side pipes are fixedly connected through the outer wall of the air inlet pipe. A top hole is opened at the top of the air inlet pipe, and a sealing block is provided at the top of the central pipe.

[0012] In the above technical solution, a rubber diaphragm is fixedly connected to the top of each of the central aeration holes and the top of each of the external aeration holes, and the sealing block is inclined on both the upper and lower sides.

[0013] In the above technical solution, an electric telescopic cylinder is fixedly connected inside the treatment tank, a connecting plate is provided below the aeration pipe, and three connecting rods are fixedly connected to the top of the connecting plate. The tops of the three connecting rods pass through the aeration pipe and are fixedly connected to the bottom of the sealing block. The connecting rods are also longitudinally and slidably connected to the outer wall of the aeration pipe and the middle pipe. The output end of the electric telescopic cylinder is fixedly connected to the bottom of the connecting plate.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention isolates the aerobic tank into two independently operating main and secondary zones using a central plate. By setting gate valves and gate plates, the parallel, series, or single-zone operation modes of the main and secondary zones can be flexibly selected according to the influent water quality and quantity. Parallel operation can share the hydraulic load, series operation can extend the hydraulic retention time to achieve deep treatment, and single-zone operation can save energy and reduce consumption or allow for maintenance without interrupting production, significantly improving the system's buffering capacity to cope with load shocks and the flexibility of operation and control.

[0015] 2. By setting up a flow guiding structure, the present invention provides a flow guiding plate that is inclined towards the top trough at the end of the main zone. When connected in series, the water flow and suspended sludge can be guided to flow to the connecting area in the middle of the middle plate, avoiding water flow short circuits or dead zones. This ensures that the water from the main zone enters the secondary zone evenly and makes full contact with the packing. At the same time, the flushing effect of the water flow reduces the risk of filter screen clogging and enhances the mud film mixing effect when the two zones are connected in series.

[0016] 3. Through the setting of the aeration mechanism, the aeration direction of the sub-zone can be switched between vertically upward and inclined towards the middle plate. When vertically aerating, the sub-zones operate independently to ensure full fluidization of the packing. When inclined, the sub-zones operate together to generate hydraulic thrust towards the middle plate, preventing the packing from accumulating and clogging in front of the filter screen. It also forces the water in the main zone to form a circulating mixture with the packing, thereby improving mass transfer efficiency and the system's shock resistance. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the treatment tank of the present invention. Figure 2 This is a rear-view three-dimensional structural diagram of the treatment pool of the present invention; Figure 3 This is a bottom-view perspective view of the treatment tank structure of the present invention; Figure 4 This is a schematic diagram of the three-dimensional structure of the treatment tank of the present invention, partially cut from the rear view. Figure 5 For the present invention Figure 4 A magnified view of the structure at point A in the middle; Figure 6 This is a rear view full sectional three-dimensional structural diagram of the aeration cylinder, electric telescopic cylinder and aeration pipe of the present invention. Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point B in the middle; Figure 8 This is a three-dimensional structural diagram of the gate valve and L-shaped stem of the present invention. Figure 9 This is a partial three-dimensional structural diagram of the rack of the present invention; Figure 10 This is a bottom-view perspective view of the three-dimensional structure of the middle plate, upper aeration disc, and aeration mechanism of the present invention. Figure 11 For the present invention Figure 10 A magnified schematic diagram of the structure at point C.

[0018] In the diagram: 1. Treatment tank; 2. Flocculation tank; 3. Aerobic tank; 4. Anoxic tank; 5. Middle plate; 6. Top trough; 7. Gate valve; 8. Filter screen; 9. Upper aeration disc; 10. Main zone; 11. Secondary zone; 12. Gate plate; 13. Threaded rod; 14. Handwheel; 15. First front U-shaped pipe; 16. Second front U-shaped pipe; 17. Upper valve; 18. First rear U-shaped pipe; 19. Second rear U-shaped pipe; 20. Lower valve; 21. Filter cartridge; 22. L-shaped rod; 2 3. Vertical groove; 24. Upper spring; 25. Rack; 26. Gear; 27. Rotating shaft; 28. Side plate; 29. ​​Side groove; 30. Inclined groove; 31. Side rod; 32. Aeration pipe; 33. Aeration cylinder; 34. Air inlet pipe; 35. Fixing ring; 36. Central aeration hole; 37. External aeration hole; 38. Central pipe; 39. Side pipe; 40. Top hole; 41. Rubber diaphragm; 42. Sealing block; 43. Electric telescopic cylinder; 44. Connecting plate; 45. Connecting rod. Detailed Implementation

[0019] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0021] In practical use, it has been found that existing multi-stage wastewater treatment equipment typically only has a single aerobic zone with fixed treatment volume and aeration intensity. This makes it impossible to flexibly adjust according to fluctuations in influent water quality and flow rate. When faced with high-concentration organic load shocks, a single aerobic zone cannot buffer the impact by adjusting hydraulic retention time or staged degradation strategies, which easily leads to decreased treatment efficiency and unstable effluent quality. Furthermore, during low-load operation or equipment maintenance, it is impossible to achieve energy saving and consumption reduction or uninterrupted operation through zone control, resulting in energy waste and operational interruptions. In addition, a single aerobic zone makes it difficult to achieve synergy or comparison of different aerobic treatment processes within the same device, limiting the flexibility of process optimization and emergency control, and making it difficult to adapt to complex and ever-changing actual wastewater treatment needs. To solve the above problems, the following structure was invented.

[0022] like Figures 1-11The wastewater multi-stage treatment equipment shown includes a treatment tank 1, which contains a flocculation tank 2, an aerobic tank 3, and an anoxic tank 4. After pretreatment, the wastewater first enters the anoxic tank 4, where denitrifying bacteria use the carbon source of the raw water to reduce nitrates in the returned nitrification liquid to nitrogen gas, thus achieving denitrification and saving carbon source. Then, it enters the aerobic tank 3, where aerobic microorganisms degrade organic pollutants and complete ammonia nitrogen nitrification. Part of the nitrification liquid is returned to the anoxic tank 4 and finally enters the flocculation tank 2. By adding flocculants, the detached biological sludge and fine particles are aggregated into flocs. The sludge scraping mechanism at the top of the flocculation tank 2 scrapes off the surface scum, the bottom sludge is discharged, and the clarified water meets the discharge standards. This process achieves efficient denitrification, phosphorus removal, and sludge-water separation through a reasonable combination of anoxic-aerobic-flocculation. A middle plate 5 is fixedly connected to the inner middle of the aerobic tank 3, which separates the aerobic tank 3 into a main zone 10 and a secondary zone 11. The bottom of the main zone 10 is equipped with an upper aeration disc 9, and the bottom of the secondary zone 11 is equipped with an adjustable aeration mechanism. The secondary zone 11 is filled with suspended packing. A top groove 6 is opened through the top of the side wall of the middle plate 5. A gate valve 7 is fixedly connected to the inner side of the top groove 6. A filter screen 8 is fixedly connected to the valve port of the gate valve 7. The filter screen 8 can prevent the suspended packing in the secondary zone 11 from flowing into the main zone 10. The main zone 10 is equipped with a flow guiding structure for guiding the flow. A gate plate 12 is slidably connected to the gate valve 7. A threaded rod 13 is rotatably connected through the top of the gate valve 7, and the threaded rod 13 is threadedly connected to the inner side wall of the gate plate 12. A handwheel 14 is fixedly connected to the top of the threaded rod 13.

[0023] A first front U-shaped pipe 15 is fixedly connected between the front side of the main zone 10 and the front side of the anoxic pool 4. A second front U-shaped pipe 16 is fixedly connected between the front side of the sub-zone 11 and the front side of the anoxic pool 4. Both the first front U-shaped pipe 15 and the second front U-shaped pipe 16 are equipped with upper valves 17.

[0024] A first rear U-shaped pipe 18 is fixedly connected between the rear side of the main zone 10 and the rear side of the flocculation tank 2. A second rear U-shaped pipe 19 is fixedly connected between the rear side of the secondary zone 11 and the rear side of the flocculation tank 2. Both the first rear U-shaped pipe 18 and the second rear U-shaped pipe 19 are equipped with a lower valve 20. A filter cartridge 21 is fixedly connected to the inner side of the secondary zone 11 relative to the side wall of the second rear U-shaped pipe 19. The filter cartridge 21 can prevent the suspended packing in the secondary zone 11 from being discharged.

[0025] The main zone 10 and the secondary zone 11 are separated by a middle plate 5. A gate valve 7 is installed on the middle plate 5 to control the connection between the two zones. When operating in parallel, the gate plate 12 on the gate valve 7 is closed. After being treated in the anoxic tank 4, the sewage enters the main zone 10 and the secondary zone 11 for synchronous treatment through the first front U-shaped pipe 15 and the second front U-shaped pipe 16, respectively. The main zone 10 degrades organic matter through aeration, while the secondary zone 11 uses aeration combined with suspended packing for biofilm treatment. The synchronous operation of the two zones improves the overall treatment capacity. (The synchronous operation of the activated sludge process in the main zone 10 and the biofilm process in the secondary zone 11 allows for comparison of the treatment efficiency and sludge yield of the two processes, providing data support for process optimization. At the same time, the biofilm in the secondary zone 11 has strong resistance to shock loads and can buffer and protect the main zone 10 when water quality changes suddenly, improving the overall stability and operational reliability of the system.) When operating in series, rotating the handwheel 14 drives the threaded rod 13 to rotate, which in turn drives the threaded gate 12 to move upward, opening the gate valve 7 and closing the upper valve 17 on the second front U-shaped pipe 16, while simultaneously closing the lower valve 20 on the first rear U-shaped pipe 18. Subsequently, the wastewater passes through the anoxic tank 4, first undergoes aeration and degradation in the main zone 10, and then enters the secondary zone 11 through the top trough 6 for deep treatment with suspended packing, enhancing the removal effect of recalcitrant pollutants. Finally, it is discharged into the flocculation tank 2 through the second rear U-shaped pipe 19. When operating alone, close gate valve 7 and activate only main zone 10 or secondary zone 11, while closing the corresponding upper valve 17 and lower valve 20. Main zone 10 is suitable for conventional organic matter degradation, while secondary zone 11 is suitable for high-load or fine treatment requirements, achieving flexible control and energy-saving operation and maintenance.

[0026] In summary, the aerobic tank 3 is isolated into two independently operating main zones 10 and secondary zones 11 by the middle plate 5. With the setting of gate valve 7 and gate plate 12, the parallel, series or single-zone operation modes of the main zone 10 and secondary zone 11 can be flexibly selected according to the influent water quality and quantity. Parallel operation can share the hydraulic load, series operation can extend the hydraulic retention time to achieve deep treatment, and single-zone operation can save energy and reduce consumption or allow for maintenance without production interruption, significantly improving the system's buffering capacity to cope with load shocks and the flexibility of operation and control.

[0027] Based on the above embodiments, it was found during use that the main area 10 in the above structure lacks a flow guiding structure, which easily creates a dead angle at the end of the main area 10. In order to solve the above problem, the above structure has been further improved.

[0028] The flow guiding structure includes an L-shaped rod 22, and a pair of L-shaped rods 22 are provided. The L-shaped rods 22 are respectively slidably connected to both sides of the top groove 6. Vertical grooves 23 are provided on both sides of the outer wall of the gate valve 7. The L-shaped rods 22 are slidably connected to the inner side of the vertical grooves 23. Several upper springs 24 are fixedly connected between the top of the gate valve 7 and the top of the L-shaped rods 22. A cavity is provided inside the treatment pool 1 relative to the bottom of the middle plate 5. A rack 25 is slidably connected to the inner side of the cavity. Several gears 26 are tilted and rotatably connected to the inner side of the cavity. The gears 26 mesh with the rack 25. A rotating shaft 27 is fixedly connected to the top of each gear 26. The rotating shaft 27 is rotatably connected to the bottom of the treatment pool 1 through a seal. A side plate 28 is fixedly connected to the top of each rotating shaft 27. The bottom of the L-shaped rods 22 is provided through the inner side of the cavity.

[0029] The rack 25 has side grooves 29 on its side wall relative to the position below the L-shaped rod 22. The bottom end of the L-shaped rod 22 is located inside the side groove 29. The side wall of the side groove 29 has a slanted groove 30. The side wall of the L-shaped rod 22 is fixedly connected to a side rod 31 inserted into the slanted groove 30.

[0030] When the rotating handwheel 14 drives the gate 12 to move upward, as the gate 12 is about to be fully opened, the gate 12 will move to the bottom of the L-shaped rod 22, thereby pushing the L-shaped rod 22 to slide longitudinally inside the vertical groove 23 and gradually compress the upper spring 24. At the same time, it will drive the side rod 31 to move upward. Since the rack 25 can only slide laterally in the cavity, and the side rod 31 is inserted in the inclined groove 30 on the rack 25, the side rod 31 will squeeze the inclined groove 30, causing the rack 25 to slide laterally in the cavity, thereby driving multiple meshing gears 26 to rotate, and then driving the side plate 28 to rotate through the rotating shaft 27, causing multiple side plates 28 to rotate ninety degrees, thereby forming an upwardly inclined guide plate next to the middle plate 5 of the main area 10.

[0031] Finally, it should be noted that the hollow design below the side plate 28 will not have a negative impact. The hollow structure allows sludge and water to pass through the bottom of the main area 10, avoiding dead corners on both sides. At the same time, the inclined plate body can still effectively guide the upper water flow and suspended matter to the gap in the partition, ensuring that the guiding function and smooth flow are taken into account, without affecting the normal operation of the system.

[0032] In summary, through the design of the above structure, a guide plate inclined towards the top trough 6 is set at the end of the main zone 10. When connected in series, the water flow and suspended sludge can be guided to flow to the connecting area in the middle of the middle plate 5, avoiding water flow short circuits or dead zones. This ensures that the water effluent from the main zone 10 enters the secondary zone 11 evenly and makes full contact with the packing. At the same time, the flushing effect of the water flow reduces the risk of filter screen 8 clogging and enhances the mud film mixing effect when the two zones are connected in series.

[0033] Based on the above embodiments, it was found during use that the aeration angle of the sub-zone 11 is fixed and cannot be adjusted. During combined operation, the airflow cannot generate a horizontal thrust pointing towards the middle plate 5, which causes the water from the main zone 10 to easily short-circuit along the edge of the sub-zone 11. The packing material does not make sufficient contact with the suspended sludge. At the same time, the packing material is prone to accumulate and blockage in front of the filter screen 8 of the middle plate 5, increasing head loss and reducing the system's resistance to shock loads and operational stability. To solve the above problems, further improvements were made to the above structure.

[0034] The aeration mechanism includes an aeration pipe 32 and an aeration cylinder 33. Three aeration cylinders 33 are provided, and all three aeration cylinders 33 are fixedly connected to the bottom of the sub-zone 11. The aeration pipe 32 is fixedly connected to the rear side of the treatment tank 1. An air inlet pipe 34 is fixedly connected between the top of the aeration pipe 32 and the bottom of the aeration cylinder 33. A fixing ring 35 is fixedly connected between the top of the inner end of the aeration cylinder 33 and the outer wall of the air inlet pipe 34. Several central aeration holes 36 are equidistantly opened at the top of the aeration cylinder 33 relative to the position above the fixing ring 35. Several external aeration holes 37 are equidistantly opened at the top of the aeration cylinder 33 relative to the outer side of the fixing ring 35. A central pipe 38 is provided inside the air inlet pipe 34. Several side pipes 39 are fixedly connected at equal intervals to the outer wall of the central pipe 38. The side walls of the several side pipes 39 are fixedly connected to the outer wall of the air inlet pipe 34. A top hole 40 is opened at the top of the air inlet pipe 34. A sealing block 42 is provided at the top of the central pipe 38.

[0035] A rubber diaphragm 41 is fixedly connected to the top of several intermediate aeration holes 36 and several external aeration holes 37. The rubber diaphragm 41 on the intermediate aeration holes 36 and external aeration holes 37 has a self-closing function. During aeration, the gas pressure causes the diaphragm to open and distribute air evenly. When the machine stops, the diaphragm automatically contracts and closes to prevent sewage backflow and blockage of the pipeline. At the same time, it prevents sludge from entering the aerator and ensures long-term stable operation of the equipment. The sealing block 42 is inclined on both the upper and lower sides to facilitate sealing the top hole 40 or the top of the intermediate pipe 38.

[0036] An electric telescopic cylinder 43 is fixedly connected inside the treatment tank 1. A connecting plate 44 is provided below the aeration pipe 32. Three connecting rods 45 are fixedly connected to the top of the connecting plate 44. The tops of the three connecting rods 45 pass through the aeration pipe 32 and are fixedly connected to the bottom of the sealing block 42. The connecting rods 45 are also sealed and longitudinally slidably connected to the outer wall of the aeration pipe 32 and the middle pipe 38. The output end of the electric telescopic cylinder 43 is fixedly connected to the bottom of the connecting plate 44.

[0037] While rotating the handwheel 14 to open the gate 12, the electric telescopic cylinder 43 is activated, driving the connecting plate 44 and connecting rod 45 to move upward, thereby pushing multiple blocking blocks 42 upward, removing the blocking blocks 42 from the middle pipe 38, releasing the blockage of the middle pipe 38, and then moving the blocking blocks 42 to the top hole 40 to block the top hole 40. Then the gas entering from the aeration pipe 32 will enter the middle pipe 38 through the air inlet pipe 34, and then enter the aeration cylinder 33 through multiple side pipes 39, and then be discharged through the external aeration hole 37. When the aeration is tilted, the combined operation generates a hydraulic thrust pointing towards the middle plate 5, preventing the packing material from accumulating and clogging in front of the filter screen 8, and forcibly pushing the water in the main zone 10 to form a circulating mixture with the packing material, improving the mass transfer efficiency and the system's shock resistance. When the handwheel 14 is rotated in the reverse direction to block the gate valve 7, the electric telescopic cylinder 43 is reset and the above operation is repeated in the reverse direction. At this time, the blocking block 42 will block the middle pipe 38 and release the blockage of the top hole 40. Then the gas discharged from the air inlet pipe 34 will enter the fixed ring 35 through the top hole 40 and then be discharged through the middle aeration hole 36 to achieve vertical aeration of the sub-zone 11.

[0038] In summary, through the design of the above structure, the aeration direction of the sub-zone 11 can be switched between vertically upward and inclined towards the middle plate 5. When aerating vertically, the sub-zones operate independently to ensure full fluidization of the packing. When aerating inclined, the sub-zones operate together to generate hydraulic thrust towards the middle plate 5, preventing the packing from accumulating and clogging in front of the filter screen 8, and forcibly pushing the water from the main zone 10 to form a circulating mixture with the packing, thereby improving mass transfer efficiency and the system's shock resistance.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of the present invention.

[0040] Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. A sewage multi-stage treatment device, comprising a treatment tank (1), a flocculation tank (2), an aerobic tank (3) and an anoxic tank (4) are arranged in the treatment tank (1), characterized in that: The middle part of the aerobic tank (3) is fixedly connected with a middle plate (5), the aerobic tank (3) is separated into a main area (10) and a secondary area (11) by the middle plate (5), the bottom of the main area (10) is provided with an upper aeration disc (9), the bottom of the secondary area (11) is provided with an adjustable aeration mechanism, the secondary area (11) is filled with suspended filler, the top end of the side wall of the middle plate (5) is provided with a top groove (6) penetratingly, the inside of the top groove (6) is fixedly connected with a gate valve (7), the valve port of the gate valve (7) is fixedly connected with a filter screen (8), the main area (10) is provided with a flow guiding structure for guiding flow, the gate valve (7) is longitudinally and slidingly connected with a gate plate (12), the top end of the gate valve (7) is rotatably connected with a threaded rod (13) penetratingly, and the inside wall of the gate plate (12) is threadedly connected with the threaded rod (13) penetratingly, and the top end of the threaded rod (13) is fixedly connected with a hand wheel (14).

2. The multi-stage wastewater treatment apparatus according to claim 1, wherein: The front side of the main area (10) and the front side of the anoxic tank (4) are fixedly and penetratingly connected with a first front U-shaped pipe (15), the front side of the secondary area (11) and the front side of the anoxic tank (4) are fixedly and penetratingly connected with a second front U-shaped pipe (16), and the first front U-shaped pipe (15) and the second front U-shaped pipe (16) are provided with upper valves (17).

3. The multi-stage wastewater treatment apparatus of claim 1, wherein: The rear side of the main area (10) and the rear side of the flocculation tank (2) are fixedly and penetratingly connected with a first rear U-shaped pipe (18), the rear side of the secondary area (11) and the rear side of the flocculation tank (2) are fixedly and penetratingly connected with a second rear U-shaped pipe (19), the first rear U-shaped pipe (18) and the second rear U-shaped pipe (19) are provided with lower valves (20), and the inside of the secondary area (11) is fixedly connected with a filter cartridge (21) at a position opposite to the side wall of the second rear U-shaped pipe (19).

4. The multi-stage wastewater treatment apparatus of claim 1, wherein: The flow guiding structure comprises a pair of L-shaped rods (22), the L-shaped rods (22) are slidingly connected on both sides of the top groove (6) penetratingly, vertical grooves (23) are formed in the outer wall of the gate valve (7) on both sides, the L-shaped rods (22) are longitudinally and slidingly connected in the inside of the vertical grooves (23), a plurality of upper springs (24) are fixedly connected between the inner top end of the gate valve (7) and the top end of the L-shaped rod (22), a cavity is formed in the inside of the processing tank (1) below the middle plate (5), a rack (25) is slidingly connected in the inside of the cavity transversely, a plurality of gears (26) are obliquely and rotatably connected in the inside of the cavity, the gears (26) are intermeshed with the rack (25), the top end of the gear (26) is fixedly connected with a rotating shaft (27), the rotating shaft (27) is rotatably connected in the bottom of the processing tank (1) penetratingly, the top end of the rotating shaft (27) is fixedly connected with a side plate (28), and the bottom end of the L-shaped rod (22) is arranged in the inside of the cavity penetratingly.

5. A multi-stage sewage treatment apparatus as claimed in claim 4, wherein: The side slot (29) is provided with a side slot (29) on the side wall of the rack (25) relative to the lower position of the L-shaped rod (22), the bottom end of the L-shaped rod (22) is arranged in the inside of the side slot (29), the side wall of the side slot (29) is provided with an inclined slot (30), and the side wall of the L-shaped rod (22) is fixedly connected with a side rod (31) inserted in the inclined slot (30).

6. The multi-stage wastewater treatment apparatus of claim 1, wherein: The aeration mechanism comprises an aeration pipe (32) and an aeration cylinder (33), the aeration cylinder (33) is provided with three, the aeration cylinder (33) is fixedly connected at the bottom end of the sub-zone (11), the aeration pipe (32) is fixedly connected through the rear side of the treatment tank (1), the aeration pipe (32) is fixedly connected through the top end and the bottom end of the aeration cylinder (33), the aeration pipe (32) is fixedly connected through the top end and the bottom end of the aeration cylinder (33), the aeration cylinder (33) is fixedly connected with a fixed ring (35) between the inner top end and the outer wall of the aeration pipe (34), the aeration cylinder (33) is provided with a plurality of middle aeration holes (36) at the top end relative to the upper position of the fixed ring (35), the aeration cylinder (33) is provided with a plurality of outer aeration holes (37) at the top end relative to the outer position of the fixed ring (35), the aeration pipe (34) is provided with a middle pipe (38) inside, the middle pipe (38) is fixedly connected with a plurality of side pipes (39) on the outer wall, a plurality of side pipes (39) are fixedly connected through the outer wall of the aeration pipe (34), the aeration pipe (34) is provided with a top hole (40) at the top end, and the middle pipe (38) is provided with a blocking block (42) at the top end.

7. A multi-stage sewage treatment apparatus as claimed in claim 6, wherein: A plurality of middle aeration holes (36) and a plurality of outer aeration holes (37) are fixedly connected with rubber diaphragms (41) at the top end, and the blocking block (42) is inclined on the upper and lower sides.

8. A multi-stage sewage treatment apparatus according to claim 6, wherein: The treatment tank (1) is fixedly connected with an electric telescopic cylinder (43) inside, the aeration pipe (32) is provided with a connecting plate (44) below, the connecting plate (44) is fixedly connected with three connecting rods (45) at the top end, the connecting rods (45) are fixedly connected at the bottom of the blocking block (42) through the aeration pipe (32) at the top end, and the connecting rods (45) are sealingly and longitudinally slidingly connected on the outer wall of the aeration pipe (32) and the middle pipe (38), and the output end of the electric telescopic cylinder (43) is fixedly connected at the bottom end of the connecting plate (44).

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