A sewage treatment bioreactor

Abstract

This invention discloses a wastewater treatment bioreactor, primarily relating to the technical field of bioreactors. It includes a reaction tank with an inlet and an outlet at the bottom and top, respectively. An aeration tank is located at the top of the reaction tank, containing several aeration pipes. A biofilm is located at the bottom of the aeration tank. The tops of the aeration pipes pass through the reaction tank and connect to it. An air inlet is located on the aeration tank. A movable frame is vertically slidably connected inside the reaction tank, and several rotating blocks, fitted around the aeration pipes, are rotatably connected to the movable frame. Several first brushes, which cooperate with the aeration pipes, are located on the inner sides of the rotating blocks. The beneficial effects of this invention are: solving the problem of membrane pores being easily clogged, hindering oxygen transfer; improving the oxygen transfer efficiency and aeration effect of the membrane module; improving pollutant removal efficiency; and ensuring the quality of the reactor effluent.

Description

Technical Field

[0001] This invention relates to the technical field of bioreactors, specifically a wastewater treatment bioreactor. Background Technology

[0002] A membrane aerated biofilm reactor (MABR) is a biofilm technology for advanced wastewater treatment. Water enters through the inlet and comes into contact with the biofilm installed on the aeration pipe. Through the adsorption, metabolism, and degradation by microorganisms on the biofilm, pollutants such as organic matter, nitrogen, phosphorus, and suspended impurities in the wastewater are removed, thus achieving wastewater treatment. At the same time, oxygen is precisely supplied directly to the interior of the biofilm attached to the membrane surface through breathable membrane components such as hollow fiber membranes. Oxygen does not need to go through the mass transfer process in the water body and can be directly utilized by the microorganisms in the biofilm, with an oxygen utilization rate of over 80%, which significantly reduces aeration energy consumption compared to traditional aeration processes. Simultaneous nitrification and denitrification reactions are achieved in a single reactor, which has a high efficiency removal capacity for pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater. It also has the advantages of low sludge production, strong resistance to shock loads, and high equipment integration, effectively making up for many shortcomings of traditional wastewater treatment processes and adapting to various high-standard advanced wastewater treatment scenarios.

[0003] During the long-term continuous operation of the MABR membrane bioreactor, the membrane surface is the core functional area for biofilm attachment, microbial enrichment, and pollutant degradation and metabolism. During reactor operation, the continuous proliferation and metabolism of microorganisms can easily lead to excessive biofilm growth. At the same time, colloidal impurities, suspended particulate matter, and inorganic salt scale in the wastewater will be continuously adsorbed and deposited on the membrane surface, which will directly cause the membrane pores to be blocked, block the oxygen transfer path, significantly reduce the oxygen transfer efficiency and aeration performance of the membrane module, and cause fluctuations in effluent water quality. Summary of the Invention

[0004] The purpose of this invention is to provide a wastewater treatment bioreactor that solves the problem of membrane pores being easily blocked, thus hindering the smooth transfer of oxygen, improves the oxygen transfer efficiency and aeration effect of the membrane module, enhances pollutant removal efficiency, and ensures the quality of the reactor effluent.

[0005] To achieve the above objectives, the invention employs the following technical solution: A wastewater treatment bioreactor includes a reaction tank with an inlet and an outlet at the bottom and top, respectively. An aeration tank is located at the top of the reaction tank. Several aeration pipes are installed inside the reaction tank. A biofilm is installed at the bottom of the aeration tank. The top of each aeration pipe passes through the reaction tank and connects to the aeration tank. An air inlet is located on the aeration tank. A movable frame is vertically slidably connected inside the reaction tank. Several rotating blocks, fitted around the outside of the aeration pipes, are rotatably connected to the movable frame. Several first brushes, used in conjunction with the aeration pipes, are provided on the inner surface of each rotating block.

[0006] Furthermore, the aeration pipe includes a first pipe and a second pipe disposed at the top of the reaction tank and connected to the aeration tank. The end of the second pipe is provided with a first conical surface. A movable plate is slidably connected inside the reaction tank. A fixed sleeve is provided on the movable plate. A second conical surface is provided on the fixed sleeve. The first pipe is clamped between the first conical surface and the second conical surface. The biofilm is disposed on the first pipe.

[0007] Furthermore, the reaction tank is provided with a fixing ring, and an elastic buffer pad is provided between the fixing ring and the movable plate. The top of the reaction tank is provided with a first flange, and the bottom of the aeration tank is provided with a second flange that cooperates with the first flange.

[0008] Furthermore, a filter screen is provided on the second pipe.

[0009] Furthermore, the aeration tank is rotatably connected to a first bushing, the first bushing is provided with a plurality of arc-shaped paddles, the aeration tank is provided with an arc-shaped groove, the arc-shaped paddles are provided with a second brush that works in conjunction with the filter screen and the arc-shaped groove, the arc-shaped groove is located at the corner of the arc-shaped paddle, and also includes a sewage pipe connected to the arc-shaped groove.

[0010] Furthermore, it also includes a rotating shaft mounted on the reaction tank, with a reduction motor at the top of the aeration tank. The movable end of the reduction motor is keyed to the rotating shaft, and the top end of the rotating shaft passes through the reaction tank and the aeration tank and is keyed to the first bushing.

[0011] Furthermore, it also includes a second bushing that is rotatably mounted on the reaction vessel. The second bushing is keyed to the bottom of the rotating shaft. The movable frame is provided with a plurality of first guide posts, and the second bushing is provided with a plurality of first spiral grooves that slide in contact with the first guide posts.

[0012] Furthermore, several second guide posts and several third guide posts are respectively provided on both sides of the first pipe, and a second spiral groove is provided on the rotating block. The second guide posts and third guide posts contact the second spiral groove in sequence and drive the rotating block to rotate around the first pipe.

[0013] Furthermore, a first bearing is provided between the first bushing and the aeration tank, a second bearing is provided between the rotating shaft and the reaction tank, and a third bearing is provided between the second bushing and the reaction tank.

[0014] Furthermore, the reaction vessel is provided with a first L-shaped block, and the bottom of the second bushing is provided with a second L-shaped block that is rotatably connected to the first L-shaped block. A sealing ring is provided between the first L-shaped block and the second L-shaped block. A drain hole extending through the reaction vessel to the outside is provided between the first L-shaped block and the third bearing. An annular chamber for use with the biofilm is formed between the second bushing and the reaction vessel.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. During normal wastewater treatment, water flows in through the inlet and comes into contact with the biofilm installed on the aeration pipes. Through the adsorption, metabolism, and degradation of microorganisms on the biofilm, pollutants such as organic matter, nitrogen, phosphorus, and suspended impurities in the wastewater are removed, thus achieving wastewater treatment. At the same time, an external pump injects oxygen into the aeration tank through the air inlet, and then sequentially delivers it to multiple aeration pipes. Through the air-permeable membrane components such as hollow fiber membranes installed on the aeration pipes, oxygen is precisely supplied directly to the biofilm attached to the membrane surface. This allows oxygen to be utilized directly by the biofilm microorganisms without going through the mass transfer process in the water body, reducing the energy consumption of the aeration process. Simultaneously, nitrification and denitrification reactions occur simultaneously, improving the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in the wastewater. 3. When installing aeration pipes, first place the buffer pad and movable plate on the fixed ring of the reaction tank in sequence. After the first pipe is fitted onto the second pipe, pass the first pipe through the fixed sleeve on the movable plate so that the first pipe is clamped between the first and second conical surfaces. Then connect the first flange and the second flange with bolts and nuts. By tightening the nuts, the second flange moves the second pipe down together, reducing the gap between the first and second conical surfaces. This allows the first pipe to fit into the fixed sleeve and the second pipe respectively, preventing oxygen from flowing out from the gaps between the fixed sleeve and the first pipe, and between the second pipe and the first pipe. This reduces the energy consumption of the aeration process, ensures precise oxygen supply to the biofilm attached to the membrane surface, and improves the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater. At the same time, by moving the movable plate further down, the elastic buffer pad between the movable plate and the fixed ring is pressed tightly, and the rebound force generated after the elastic buffer pad is compressed makes the first pipe further fit with the fixed sleeve and the second pipe, preventing oxygen leakage during the aeration process and improving the removal effect of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater. 4. A filter screen installed on the second pipe filters out impurities contained in the oxygen, preventing impurities from entering the biofilm with the oxygen and causing blockage of the biofilm pores; a geared motor drives the rotating shaft to rotate, causing the first bushing connected to the rotating shaft to rotate inside the aeration tank, causing several arc-shaped paddles to rotate. The second brushes on the arc-shaped paddles contact the filter screen, sweeping off the impurities adsorbed on the filter screen, preventing the impurities adsorbed on the filter screen from clogging the filter pores, ensuring smooth passage of oxygen through the filter screen, reducing energy consumption in the aeration process, ensuring precise oxygen supply to the biofilm attached to the membrane surface, and improving the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater; In addition, the swept-off impurities are pushed by the arc-shaped pusher to the corner of the arc-shaped pusher and fall into the arc-shaped groove. When the impurities in the arc-shaped groove accumulate to a certain amount, the valve of the sewage discharge pipe is opened, and the impurities in the sewage discharge pipe accessories are discharged from the aeration tank by the external pump. At the same time, the impurities are gradually moved to the sewage discharge pipe by the pusher of the second brush, thereby removing impurities from the filter screen, improving the stability of the overall equipment operation, and improving the sewage treatment effect. 5. When impurities accumulate to a certain amount on the biofilm, the backwashing process is initiated, allowing water to enter through the inlet and wash the biofilm on several aeration pipes. Simultaneously, the geared motor drives the rotating shaft to rotate inside the reaction tank. Through the cooperation of the rotating shaft key, the second bushing, the first spiral groove, the movable frame, the first guide column, and the aeration pipe, the movable frame slides on the aeration tank. At the same time, through the cooperation of the second pipe, the second guide column, the third guide column, the rotating block, and the second spiral groove, the rotating block continuously rotates around the aeration pipe, allowing the brushes on several rotating blocks to contact the filter pores at various locations on the biofilm, promptly sweeping impurities off the biofilm. Combined with the water flow carrying away the impurities, this removes impurities from the biofilm, preventing colloidal impurities, suspended particulate matter, and inorganic salt scale from continuously adsorbing and depositing on the membrane surface, which would clog the membrane pores and block the oxygen transfer path. This improves the oxygen transfer efficiency and aeration effect of the biofilm, enhances pollutant removal efficiency, and ensures the quality of the reactor effluent. Furthermore, there is no need for an additional power unit to drive the movable frame to rotate inside the reaction vessel, or for the rotating block to rotate on the movable frame, reducing the space required for power unit installation and the cost of manufacturing. Attached Figure Description

[0016] Appendix Figure 1 This is a schematic diagram of the internal structure of the present invention.

[0017] Appendix Figure 2 This is an appendix to the present invention. Figure 1 A magnified view of part A in the middle.

[0018] Appendix Figure 3 This is a schematic diagram of the sewage pipe structure of the present invention.

[0019] Appendix Figure 4 This is a schematic diagram of the arc-shaped lever block of the present invention.

[0020] Appendix Figure 5 This is a schematic diagram of the structure of the second bushing of the present invention.

[0021] Appendix Figure 6 This is a schematic diagram of the rotating block of the present invention.

[0022] Appendix Figure 7 This is an appendix to the present invention. Figure 1 A magnified view of part B in the middle section.

[0023] The labels shown in the attached diagram: 1. Reaction tank; 2. Inlet; 3. Outlet; 4. Aeration tank; 5. Aeration pipe; 6. Biofilm; 7. Air inlet; 8. Movable frame; 9. Rotating block; 10. First brush; 11. First pipe; 12. Second pipe; 13. First conical surface; 14. Movable plate; 15. Fixed sleeve; 16. Second conical surface; 17. Fixed ring; 18. Elastic buffer pad; 19. First flange; 20. Second flange; 21. Filter screen; 22. First bushing; 23. Arc-shaped lever; 24. Arc-shaped groove; 25. Second brush; 26. Sewage pipe; 27. Rotating shaft; 28. Gear motor; 29. ​​Second bushing; 30. First guide post; 31. First spiral groove; 32. Second guide post; 33. Third guide post; 34. Second spiral groove; 35. First bearing; 36. Second bearing; 37. Third bearing; 38. First L-shaped block; 39. Second L-shaped block; 40. Sealing ring; 41. Drain hole. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined in this application.

[0025] This invention provides a wastewater treatment bioreactor, such as... Figure 1 , Figure 2 , Figure 5 and Figure 6As shown, the system includes a reaction tank 1, with an inlet 2 at the bottom and an outlet 3 at the top. An aeration tank 4 is located at the top of the reaction tank 1. Several aeration pipes 5 are installed inside the reaction tank 1. A biofilm 6 is located at the bottom of the aeration tank 4. The tops of the aeration pipes 5 pass through the reaction tank 1 and connect to the aeration tank 4. An air inlet 7 is located on the aeration tank 4. During the wastewater treatment process by the biofilm 6, oxygen is pumped into the aeration tank 4 through the air inlet 7 by an external pump. The oxygen is then sequentially transferred to the multiple aeration pipes 5. Through the hollow fiber membrane and other breathable membrane components installed on the aeration pipes 5, oxygen is precisely supplied directly to the biofilm 6 attached to the membrane surface. This allows the oxygen to be utilized directly by the microorganisms in the biofilm 6 without undergoing a mass transfer process in the water, reducing energy consumption during aeration. Simultaneously, nitrification and denitrification reactions occur concurrently, improving the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in the wastewater. The reaction tank 1 is vertically slidably connected... A movable frame 8 is provided, on which several rotating blocks 9 are rotatably connected, fitted around the outside of the aeration pipes 5. The inner surface of each rotating block 9 is provided with several first brushes 10 that cooperate with the aeration pipes 5. When impurities accumulate on the biofilm 6 to a certain amount, the backwashing process is initiated, allowing water to enter through the inlet 2 and wash the biofilm 6 on the aeration pipes 5. Simultaneously, by moving the movable frame 8 within the reaction tank 1, the rotating blocks 9 rotate on the movable frame 8, causing the brushes on the rotating blocks 9 to contact the filter pores at various locations on the biofilm 6, promptly sweeping impurities off the biofilm 6. Combined with the water flow carrying away the impurities, this removes impurities from the biofilm 6, preventing the continuous adsorption and deposition of colloidal impurities, suspended particulate matter, and inorganic salt scale from the wastewater on the membrane surface, which could lead to membrane pore blockage and obstruction of oxygen transfer pathways. This improves the oxygen transfer efficiency and aeration effect of the biofilm 6, enhances pollutant removal efficiency, and ensures the quality of the reactor effluent.

[0026] The aeration pipe 5 includes a first pipe 11 and a second pipe 12 connected to the aeration tank 4 at the top of the reaction tank 1. The end of the second pipe 12 is provided with a first conical surface 13. A movable plate 14 is slidably connected inside the reaction tank 1. A fixed sleeve 15 is provided on the movable plate 14. A second conical surface 16 is provided on the fixed sleeve 15. The first pipe 11 is clamped between the first conical surface 13 and the second conical surface 16. The biofilm 6 is disposed on the first pipe 11. When the aeration pipe 5 needs to be installed, one end of the first pipe 11 is sleeved on the first conical surface 13 of the second pipe 12, and then the other end of the first pipe 11 is passed through the fixed sleeve 16 on the movable plate 14. The sleeve 15 is then moved, and finally the movable plate 14 is moved to clamp the first pipe 11 between the first conical surface 13 and the second conical surface 16, thereby fixing the first pipe 11 and the second pipe 12. At the same time, by further moving the movable plate 14, the gap between the first conical surface 13 and the second conical surface 16 is reduced, so that the first pipe 11 is in contact with the fixed sleeve 15 and the second pipe 12 respectively, preventing oxygen from flowing out from the gap between the fixed sleeve 15 and the first pipe 11, and the second pipe 12 and the first pipe 11, reducing the energy consumption of the aeration process, ensuring precise oxygen supply to the biofilm 6 attached to the membrane surface, and improving the removal effect of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater.

[0027] Preferred, such as Figure 2 As shown, the reaction tank 1 is provided with a fixing ring 17, and an elastic buffer pad 18 is provided between the fixing ring 17 and the movable plate 14. The top of the reaction tank 1 is provided with a first flange 19, and the bottom of the aeration tank 4 is provided with a second flange 20 that cooperates with the first flange 19. First, the buffer pad and the movable plate 14 are placed on the fixing ring 17 of the reaction tank 1 in sequence. After the first pipe 11 is sleeved on the second pipe 12, the first pipe 11 is passed through the fixing sleeve 15 provided on the movable plate 14, so that the first pipe 11 is clamped between the first conical surface 13 and the second conical surface 16. Then, the first flange 19 and the second flange 20 are connected by bolts and nuts, and by tightening the nuts, the second flange 20 moves the second pipe 12 down together. By narrowing the gap between the first conical surface 13 and the second conical surface 16, the first pipe 11 is brought into contact with the fixed sleeve 15 and the second pipe 12 respectively, preventing oxygen from flowing out from the gaps between the fixed sleeve 15 and the first pipe 11, and between the second pipe 12 and the first pipe 11, thus improving the removal effect of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater. At the same time, by moving the movable plate 14 further downward, the elastic buffer pad 18 between the movable plate 14 and the fixed ring 17 is pressed tightly, and the rebound force generated after the elastic buffer pad 18 is compressed makes the first pipe 11 further close to the fixed sleeve 15 and the second pipe 12, preventing oxygen leakage during the aeration process and improving the removal effect of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater.

[0028] Preferred, such as Figure 2 and Figure 4 As shown, the second pipe 12 is equipped with a filter screen 21 to filter impurities contained in the oxygen, preventing impurities from entering the biofilm 6 with the oxygen and causing blockage of the pores of the biofilm 6.

[0029] Preferred, such as Figure 2 , Figure 3 and Figure 4 As shown, a first bushing 22 is rotatably connected to the aeration tank 4. The first bushing 22 has several arc-shaped levers 23. The aeration tank 4 has an arc-shaped groove 24. Each arc-shaped lever 23 has a second brush 25 that cooperates with the filter screen 21 and the arc-shaped groove 24. The arc-shaped groove 24 is located at the corner of the arc-shaped lever 23. A drain pipe 26 connected to the arc-shaped groove 24 is also included. The rotation of the first bushing 22 within the aeration tank 4 drives the several arc-shaped levers 23 to rotate, causing the second brushes 25 on the arc-shaped levers 23 to contact the filter screen 21, sweeping off impurities adsorbed on the filter screen 21. This prevents impurities from clogging the filter pores of the filter screen 21, ensuring adequate oxygen supply. The impurities pass smoothly through the filter screen 21, reducing energy consumption during the aeration process and ensuring precise oxygen supply to the biofilm 6 attached to the membrane surface, thereby improving the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater. Then, the swept-off impurities are pushed by the arc-shaped lever 23 to the corner of the lever 23 and fall into the arc-shaped groove 24. When the impurities in the arc-shaped groove 24 accumulate to a certain amount, the valve of the sewage discharge pipe 26 is opened, and the impurities attached to the sewage discharge pipe 26 are discharged from the aeration tank 4 by an external pump. Simultaneously, the second brush 25 moves the impurities gradually to the sewage discharge pipe 26, thus removing impurities from the filter screen 21, improving the overall stability of the equipment operation, and enhancing the wastewater treatment effect.

[0030] Preferred, such as Figure 3 As shown, it also includes a rotating shaft 27 rotatably mounted on the reaction tank 1. The top of the aeration tank 4 is equipped with a reduction motor 28. The movable end of the reduction motor 28 is keyed to the rotating shaft 27. The top end of the rotating shaft 27 passes through the reaction tank 1 and the aeration tank 4 and is keyed to the first bushing 22, providing power for the first bushing 22 to rotate on the aeration tank 4.

[0031] Preferred, such as Figure 1 , Figure 4 , Figure 5 and Figure 7As shown, it also includes a second bushing 29 rotatably mounted on the reaction tank 1. The second bushing 29 is keyed to the bottom of the rotating shaft 27. The movable frame 8 is provided with a plurality of first guide posts 30. The second bushing 29 is provided with a plurality of first spiral grooves 31 that slide in contact with the first guide posts 30. The rotating shaft 27 is driven to rotate inside the reaction tank 1 by the reduction motor 28, which drives the second bushing 29 keyed to the rotating shaft 27 to rotate together. The plurality of first spiral grooves 31 provided on the second bushing 29 contact the first guide posts 30 provided on the movable frame 8 respectively. With the guidance of the aeration pipe 5, the component force generated drives the movable frame 8 to slide on the aeration tank 4, so that the brush contacts the filter pores at various positions of the biofilm 6, thereby improving the cleaning range of the brush. At the same time, there is no need to set up an additional power device to drive the movable frame 8 to rotate inside the reaction tank 1, reducing the space required for power device installation and the cost required for manufacturing.

[0032] Preferred, such as Figure 5 and Figure 6 As shown, several second guide posts 32 and several third guide posts 33 are respectively provided on both sides of the first pipe 11. The rotating block 9 is provided with a second spiral groove 34. The second guide posts 32 and third guide posts 33 contact the second spiral groove 34 in sequence, driving the rotating block 9 to rotate around the first pipe 11. During the sliding process of the movable frame 8 on the reaction tank 1, one of the second guide posts 32 provided on one side of the second pipe 12 contacts the second spiral groove 34 provided on the rotating block 9, and the resulting component force drives the rotating block 9 to rotate around the aeration pipe 5 until the rotating block 9 rotates 180 degrees, so that one of the third guide posts 33 provided on the other side of the second pipe 12 corresponds to the second spiral groove 34 provided on the rotating block 9. Then, the movable frame 8 is further moved, and the component force generated after the third guide post 33 contacts the second spiral groove 34 further drives the rotating block 9 to rotate around the aeration pipe 5. The air pipe 5 rotates, repeating the above actions, causing the rotating blocks 9 to continuously rotate around the aeration pipe 5. This allows the brushes on several rotating blocks 9 to contact the filter pores at various locations on the biofilm 6, promptly sweeping impurities off the biofilm 6. Combined with the water flow carrying away the impurities, this removes impurities from the biofilm 6, preventing the continuous adsorption and deposition of colloidal impurities, suspended particulate matter, and inorganic salt scale from the wastewater on the membrane surface. This prevents the membrane pores from becoming clogged and blocking the oxygen transfer path, thereby improving the oxygen transfer efficiency and aeration effect of the biofilm 6, increasing pollutant removal efficiency, and ensuring the quality of the reactor effluent. Furthermore, there is no need for an additional power unit to drive the rotating blocks 9 to rotate on the movable frame 8, reducing the space required for power unit installation and the manufacturing cost. In addition, there is no need to use screws and gears to transmit power in the water, avoiding the lubrication of screws and gears from polluting the water source, further improving the quality of the reactor effluent.

[0033] Preferred, such as Figure 3 , Figure 5 and Figure 7 As shown, a first bearing 35 is provided between the first bushing 22 and the aeration tank 4, a second bearing 36 is provided between the rotating shaft 27 and the reaction tank 1, and a third bearing 37 is provided between the second bushing 29 and the reaction tank 1. This improves the smoothness of the rotation of the first bushing 22, the rotating shaft 27 and the second bushing 29 on the aeration tank 4 and the reaction tank 1, ensures the stability of equipment operation, and improves the effect of sewage treatment.

[0034] Preferred, such as Figure 5 and Figure 7 As shown, the reaction vessel 1 is provided with a first L-shaped block 38, and the bottom of the second bushing 29 is provided with a second L-shaped block 39 rotatably connected to the first L-shaped block 38. A sealing ring 40 is provided between the first L-shaped block 38 and the second L-shaped block 39. A drain hole 41 extending through the reaction vessel 1 to the outside is provided between the first L-shaped block 38 and the third bearing 37. An annular chamber for use with the biofilm 6 is formed between the second bushing 29 and the reaction vessel 1. By sealing the first L-shaped block 38 and the second L-shaped block 39 with the sealing ring 40, water flow is prevented from entering the third bearing 37 through the second bushing 29, thus preventing the third bearing 37 from being damaged. The corrosion and rusting caused by sewage extend the service life of the third bearing 37. At the same time, the drainage hole 41 provided between the first L-shaped block 38 and the third bearing 37 allows a small amount of sewage passing through the sealing ring 40 to be discharged to the outside of the reaction tank 1 in a timely manner, further preventing the third bearing 37 from being corroded and rusted by sewage, thus extending the service life of the third bearing 37. In addition, the second bushing 29 separates the internal space of the reaction tank 1, allowing water to flow in the annular cavity formed between the second bushing 29 and the reaction tank 1. This ensures that the biofilm 6 on the multiple aeration pipes 5 is in uniform contact with the water flow in the annular cavity, reducing dead water areas and further improving the sewage treatment effect.

[0035] Example 1 This invention provides a wastewater treatment bioreactor, such as... Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, during normal wastewater treatment, water flows in through inlet 2 and comes into contact with the biofilm 6 installed on the aeration pipe 5. Through the adsorption, metabolism, and degradation of microorganisms on the biofilm 6, pollutants such as organic matter, nitrogen, phosphorus, and suspended impurities in the wastewater are removed, thus achieving wastewater treatment. At the same time, an external pump injects oxygen into the aeration tank 4 through the air inlet 7, and then sequentially transmits it to multiple aeration pipes 5. Through the air-permeable membrane components such as hollow fiber membranes installed on the aeration pipes 5, oxygen is precisely supplied directly to the biofilm 6 attached to the membrane surface. This allows oxygen to be utilized directly by the microorganisms in the biofilm 6 without going through the mass transfer process in the water body, reducing the energy consumption of the aeration process. At the same time, nitrification and denitrification reactions occur simultaneously, improving the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in the wastewater. When impurities accumulate to a certain amount on the biofilm 6, the backwashing process is initiated, allowing water to enter through the inlet 2 and flush the biofilm 6 on several aeration pipes 5. Simultaneously, by moving the movable frame 8 within the reaction tank 1, and cooperating with several rotating blocks 9 rotating on the movable frame 8, the brushes on the rotating blocks 9 contact the filter pores at various locations on the biofilm 6, promptly sweeping impurities off the biofilm 6. Combined with the water flow carrying away the impurities, this removes impurities from the biofilm 6, preventing colloidal impurities, suspended particulate matter, and inorganic salt scale from continuously adsorbing and depositing on the membrane surface, which would clog the membrane pores and block the oxygen transfer path. This, in turn, improves the oxygen transfer efficiency and aeration effect of the biofilm 6, enhances pollutant removal efficiency, and ensures the quality of the reactor effluent.

[0036] Example 2 Based on Example 1, such as Figure 2 and Figure 3 As shown, when installing the aeration pipe 5, first place the buffer pad and the movable plate 14 on the fixing ring 17 of the reaction tank 1 in sequence. After fitting the first pipe 11 onto the second pipe 12, pass the first pipe 11 through the fixing sleeve 15 provided on the movable plate 14, so that the first pipe 11 is clamped between the first conical surface 13 and the second conical surface 16. Then, connect the first flange 19 and the second flange 20 with bolts and nuts, and tighten the nuts so that the second flange 20 moves the second pipe 12 down together, reducing the gap between the first conical surface 13 and the second conical surface 16, so that the first pipe 11 fits against the fixing sleeve 15 and the second pipe 12 respectively, preventing oxygen from flowing out of the fixing sleeve 15. The gaps between sleeve 15 and the first pipe 11, and between the second pipe 12 and the first pipe 11, allow oxygen to flow out, reducing energy consumption during the aeration process and ensuring precise oxygen supply to the biofilm 6 attached to the membrane surface, thereby improving the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater. At the same time, by further lowering the movable plate 14, the elastic buffer pad 18 between the movable plate 14 and the fixed ring 17 is pressed tightly. The rebound force generated after the elastic buffer pad 18 is compressed further causes the first pipe 11 to fit more closely with the fixed sleeve 15 and the second pipe 12, preventing oxygen leakage during the aeration process and improving the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater. In addition, during the connection of the first flange 19 and the second flange 20, the top end of the rotating shaft 27 passes through the reaction vessel 1 and through the first bushing 22 and is fitted onto the outside of the geared motor 28, thereby realizing the key connection between the rotating shaft 27 and the movable end of the geared motor 28 and the first bushing 22, simplifying the connection process between the geared motor 28 and the rotating shaft 27 and the first bushing 22, and facilitating the maintenance of the bioreactor.

[0037] Example 3 Based on Example 1, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the filter screen 21 installed on the second pipe 12 filters impurities contained in the oxygen, preventing impurities from entering the biofilm 6 with the oxygen and causing blockage of the biofilm 6 pores. The geared motor 28 drives the rotating shaft 27 to rotate, which in turn drives the first bushing 22, which is keyed to the rotating shaft 27, to rotate inside the aeration tank 4. This causes several arc-shaped paddles 23 to rotate, and the second brushes 25 on the arc-shaped paddles 23 come into contact with the filter screen 21, sweeping off the impurities adsorbed on the filter screen 21. This prevents the impurities adsorbed on the filter screen 21 from clogging the filter pores of the filter screen 21, ensuring that oxygen can pass smoothly through the filter screen 21, reducing the energy consumption of the aeration process, and ensuring that oxygen reaches the membrane surface. The attached biofilm 6 provides precise oxygenation, improving the removal efficiency of pollutants such as COD, ammonia nitrogen, total nitrogen, and total phosphorus in wastewater. Then, the swept-off impurities are pushed by the arc-shaped lever 23 to the corner of the lever 23 and fall into the arc-shaped groove 24. When the impurities in the arc-shaped groove 24 accumulate to a certain amount, the valve of the sewage discharge pipe 26 is opened, and an external pump discharges the impurities from the aeration tank 4. Simultaneously, the second brush 25 moves the impurities gradually to the sewage discharge pipe 26, thereby removing impurities from the filter screen 21, improving the overall stability of the equipment operation, and enhancing the wastewater treatment effect.

[0038] Example 4 Based on Example 3, such as Figure 5 Figure 6 and Figure 7As shown, when impurities accumulate to a certain amount on the biofilm 6, the backwashing process is initiated, allowing water to enter through the inlet 2 and wash the biofilm 6 on several aeration pipes 5. Simultaneously, the geared motor 28 drives the rotating shaft 27 to rotate inside the reaction tank 1, causing the second bushing 29, which is keyed to the rotating shaft 27, to rotate as well. Several first spiral grooves 31 on the second bushing 29 contact the first guide posts 30 on the movable frame 8, and in conjunction with the guidance of the aeration pipes 5 on the movable frame 8, the resulting force causes the movable frame 8 to slide on the aeration tank 4. At the same time, one of the second guide posts 32 on one side of the second pipe 12 contacts the second spiral groove 34 on the rotating block 9, and the resulting force causes the rotating block 9 to rotate around the aeration pipe 5 until the rotating block 9 rotates 180 degrees, causing the other side of the second pipe 12 to rotate. One of the third guide posts 33 corresponds to the second spiral groove 34 on the rotating block 9. Then, the movable frame 8 is moved further. The force generated after the third guide post 33 contacts the second spiral groove 34 further drives the rotating block 9 to rotate around the aeration pipe 5. The above action is repeated so that the rotating block 9 continues to rotate around the aeration pipe 5. The brushes on several rotating blocks 9 contact the filter pores at various positions of the biofilm 6, and sweep impurities off the biofilm 6 in time. With the help of water flow, the impurities are removed from the biofilm 6. This avoids the continuous adsorption and deposition of colloidal impurities, suspended particles, and inorganic salt scale layers in the sewage on the membrane surface, which would cause the membrane pores to be blocked and the oxygen transfer path to be blocked. This improves the oxygen transfer efficiency and aeration effect of the biofilm 6, improves the pollutant removal efficiency, and ensures the quality of the reactor effluent. Furthermore, there is no need to install an additional power unit to drive the movable frame 8 to rotate inside the reaction tank 1, or for the rotating block 9 to rotate on the movable frame 8, which reduces the space required for power unit installation and the cost of manufacturing. In addition, there is no need to use screws and gears to transmit power in the water, avoiding the contamination of the water source by the lubrication on the screws and gears, and further improving the quality of the reactor effluent.

Claims

1. A wastewater treatment bioreactor, comprising a reaction tank (1), wherein the bottom and top of the reaction tank (1) are respectively provided with an inlet (2) and an outlet (3), characterized in that: The top of the reaction tank (1) is provided with an aeration tank (4), and the reaction tank (1) is provided with several aeration pipes (5). The bottom of the aeration tank (4) is provided with a biofilm (6). The top of the aeration pipe (5) passes through the reaction tank (1) and is connected to the aeration tank (4). The aeration tank (4) is provided with an air inlet (7). The reaction tank (1) is slidably connected with a movable frame (8) in the vertical direction. Several rotating blocks (9) are rotatably connected to the movable frame (8) and sleeved on the outside of the aeration pipes (5). Several first brushes (10) are provided on the inner side of the rotating blocks (9) to cooperate with the aeration pipes (5).

2. The wastewater treatment bioreactor according to claim 1, characterized in that: The aeration pipe (5) includes a first pipe (11) and a second pipe (12) connected to the aeration tank (4) at the top of the reaction tank (1). The end of the second pipe (12) is provided with a first conical surface (13). A movable plate (14) is slidably connected inside the reaction tank (1). A fixed sleeve (15) is provided on the movable plate (14). A second conical surface (16) is provided on the fixed sleeve (15). The first pipe (11) is clamped between the first conical surface (13) and the second conical surface (16). The biofilm (6) is disposed on the first pipe (11).

3. A wastewater treatment bioreactor according to claim 2, characterized in that: The reaction tank (1) is provided with a fixing ring (17), and an elastic buffer pad (18) is provided between the fixing ring (17) and the movable plate (14). The top of the reaction tank (1) is provided with a first flange (19), and the bottom of the aeration tank (4) is provided with a second flange (20) that cooperates with the first flange (19).

4. A wastewater treatment bioreactor according to claim 2, characterized in that: The second pipe (12) is equipped with a filter screen (21).

5. A wastewater treatment bioreactor according to claim 4, characterized in that: The aeration tank (4) is rotatably connected to a first bushing (22), and the first bushing (22) is provided with a plurality of arc-shaped paddles (23). The aeration tank (4) is provided with an arc-shaped groove (24). The arc-shaped paddles (23) are provided with a second brush (25) that works in conjunction with the filter screen (21) and the arc-shaped groove (24). The arc-shaped groove (24) is located at the corner of the arc-shaped paddles (23), and also includes a sewage pipe (26) connected to the arc-shaped groove (24).

6. A wastewater treatment bioreactor according to claim 5, characterized in that: It also includes a rotating shaft (27) mounted on the reaction tank (1), and a speed reduction motor (28) is provided on the top of the aeration tank (4). The movable end of the speed reduction motor (28) is keyed to the rotating shaft (27), and the top end of the rotating shaft (27) passes through the reaction tank (1) and the aeration tank (4) and is keyed to the first bushing (22).

7. A wastewater treatment bioreactor according to claim 6, characterized in that: It also includes a second bushing (29) rotatably mounted on the reaction vessel (1), the second bushing (29) being keyed to the bottom of the rotating shaft (27), the movable frame (8) having a plurality of first guide posts (30), and the second bushing (29) having a plurality of first spiral grooves (31) that slide in contact with the first guide posts (30).

8. A wastewater treatment bioreactor according to claim 7, characterized in that: The first pipe (11) has several second guide posts (32) and several third guide posts (33) on both sides respectively. The rotating block (9) has a second spiral groove (34). The second guide posts (32) and the third guide posts (33) contact the second spiral groove (34) in sequence and drive the rotating block (9) to rotate around the first pipe (11).

9. A wastewater treatment bioreactor according to claim 7, characterized in that: A first bearing (35) is provided between the first bushing (22) and the aeration tank (4), a second bearing (36) is provided between the rotating shaft (27) and the reaction tank (1), and a third bearing (37) is provided between the second bushing (29) and the reaction tank (1).

10. A wastewater treatment bioreactor according to claim 7, characterized in that: The reaction vessel (1) is provided with a first L-shaped block (38), and the bottom of the second bushing (29) is provided with a second L-shaped block (39) that is rotatably connected to the first L-shaped block (38). A sealing ring (40) is provided between the first L-shaped block (38) and the second L-shaped block (39). A drain hole (41) extending through the reaction vessel (1) to the outside is provided between the first L-shaped block (38) and the third bearing (37). An annular chamber is formed between the second bushing (29) and the reaction vessel (1) to cooperate with the biofilm (6).

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