A sulfur-iron autotrophic denitrification biological nitrogen removal device

Abstract

The present application relates to a kind of sulfur iron autotrophic denitrification biological nitrogen removal device.The device includes shell, shell upper portion is equipped with sewage pipe, sewage pipe has the end of extension that extends to the inner wall of shell inside.The shell is equipped with a rotating plate, and the rotating plate is equipped with a filter screen device;Filter screen device includes first cylindrical filter screen, one end of first cylindrical filter screen towards the end of extension is sealingly equipped with bellows, inlet of bellows is equipped with annular connecting plate, and annular connecting plate is provided with sealing structure between the end of extension;Sealing structure includes annular sealing protrusion on the outer wall of end of extension, multiple electromagnets are spaced apart along the circumference and arranged on annular sealing protrusion, multiple permanent magnets corresponding to electromagnet are arranged on annular connecting plate, and first sealing ring is arranged on annular sealing protrusion.Compared with prior art, the replacement time of filter screen can be greatly shortened, the treatment efficiency of sewage is improved, and it is easy to use.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a sulfur-iron autotrophic denitrification biological denitrification device. Background Technology

[0002] In the field of wastewater treatment, a novel wastewater treatment technology called pyrite autotrophic denitrification packing has attracted widespread attention. This technology utilizes the properties of pyrite and the action of denitrifying bacteria to effectively remove nitrates and nitrites from wastewater, bringing a new breakthrough to wastewater treatment. During the wastewater treatment process, it fully utilizes the properties of pyrite, namely its ability to form stable complexes with various metal ions. Through the action of denitrifying bacteria, nitrates and nitrites are reduced to nitrogen gas, thereby purifying the water. This is a highly efficient, energy-saving, environmentally friendly, and easy-to-maintain wastewater treatment technology.

[0003] Sulfur autotrophic denitrification technology can remove nitrogen from wastewater without the need for additives. The sulfur autotrophic denitrification process avoids the breakthrough phenomenon caused by excessive addition of traditional carbon sources, completely eliminates the problem of increased COD in wastewater, and has the advantages of lower filter media consumption than the cost of adding carbon sources, lower sludge production, reduced cleaning cycle, and self-digestion of pyrite, eliminating the need to replace filter media. It only needs to be added to the biological denitrification tower about once every six months. These advantages greatly reduce the cost of wastewater treatment plants and have been widely used in major wastewater treatment plants.

[0004] During the process of adding wastewater to a biological denitrification tower, the wastewater contains a large amount of impurities, necessitating filtration. Existing technologies often use filter screens for filtration; however, these screens frequently become clogged, leading to poor water flow and affecting the efficiency of subsequent wastewater injection into the biological denitrification tower, thus impacting wastewater treatment efficiency. Furthermore, once clogged, a large amount of wastewater cannot be backflowed during maintenance and cleaning, requiring either on-site discharge or the construction of a dedicated wastewater tank. Moreover, once filter screen clogging occurs during operation, the system must be shut down for disassembly, replacement, or cleaning, significantly impacting wastewater treatment timeliness and proving time-consuming and labor-intensive. Summary of the Invention

[0005] The purpose of this invention is to provide a sulfur-iron autotrophic denitrification biological denitrification device to solve the problem in the prior art where filter clogging requires frequent shutdowns for disassembly and replacement or cleaning, which affects the efficiency of wastewater treatment.

[0006] To achieve the above objectives, the present invention provides a sulfur-iron autotrophic denitrification biological nitrogen removal device with the following technical solution: A sulfur-iron autotrophic denitrification biological nitrogen removal device includes a shell, a wastewater pipe disposed on the upper part of the shell, the wastewater pipe having an extended end extending inward from the inner wall of the shell; a rotating plate is rotatably disposed inside the shell, and at least two filter screen devices corresponding to the extended end are disposed on the rotating plate as it rotates; the filter screen devices include a first cylindrical filter screen, the bottom of the first cylindrical filter screen being a filtration section, and a guide groove disposed below the filtration section inside the shell; a corrugated pipe is sealed at the end of the first cylindrical filter screen facing the extended end, an annular connecting plate is disposed at the inlet of the corrugated pipe, and a sealing structure is disposed between the annular connecting plate and the extended end; the sealing structure includes a component disposed at the extended end... An annular sealing protrusion is located on the outer wall of the end. Multiple electromagnets are spaced circumferentially on the annular sealing protrusion. Multiple permanent magnets corresponding to the electromagnets are arranged on the annular connecting plate. A first sealing ring is provided on the side of the annular sealing protrusion facing the annular connecting plate for sealing cooperation with the annular connecting plate. When the electromagnet is energized, it attracts the permanent magnet, causing the bellows to extend and fit onto the extended end, and the annular connecting plate is pressed on the first sealing ring to achieve a seal between the bellows and the annular sealing protrusion. When the electromagnet is energized in the reverse direction, it repels the permanent magnet, causing the bellows to retract and separate from the extended end, and the annular connecting plate to separate from the extended end, avoiding interference between the bellows, the annular connecting plate and the extended end when the rotating plate rotates. An inspection door is provided on the lower side wall of the housing.

[0007] The rotating plate is provided with mounting holes for the horizontally guided movement of each first cylindrical filter screen. The first cylindrical filter screen is provided with a first limiting protrusion on one side of the rotating plate and a second limiting protrusion on the other end of the rotating plate to prevent the horizontal position of the first cylindrical filter screen from deviating excessively during the rotation of the rotating plate. The distance between the first limiting protrusion and the second limiting protrusion is slightly greater than the horizontal thickness of the rotating plate.

[0008] The housing is provided with a first driving mechanism that drives the second limiting protrusion to bring the end of the first cylindrical filter screen close to the protruding end, which can increase the first cylindrical filter screen's ability to withstand the impact of sewage and ensure the sealing between the annular connecting plate and the annular sealing protrusion.

[0009] The inner wall of the annular connecting plate is provided with a first inclined surface, and the outer side of the extended end is provided with a corresponding second inclined surface, and a second sealing ring is provided on the second inclined surface.

[0010] A second cylindrical filter screen is sealed on the outer rear end of the first cylindrical filter screen; a connecting hole is provided on the outer wall of the first cylindrical filter screen located inside the second cylindrical filter screen; a filter cylinder is guided inside the first cylindrical filter screen, and the bottom plate of the filter cylinder is a porous plate forming the filtering part of the first cylindrical filter screen; a stop strip is provided on the inner wall of the first cylindrical filter screen behind the filter cylinder; the filter cylinder has a blocking part that blocks the connecting hole after being stopped and limited by the stop strip under the impact of water flow; when the filter cylinder is blocked by impurities and the water pressure increases, the stop strip is broken under the sewage pressure, and the filter cylinder is moved backward by the water flow to make the blocking part open the connecting hole.

[0011] The first cylindrical filter screen is provided with a stop part to limit the filter cylinder that is moved backward by the water flow after the stop bar breaks, and to prevent it from falling off the first cylindrical filter screen.

[0012] The first cylindrical filter screen has an opening at its rear end, and an installation step is provided at the opening. An installation ring is installed on the installation step, and a stop strip is provided on the inner wall of the installation ring. A nut is threadedly connected to the first cylindrical filter screen, and a pressure strip for pressing and fixing the installation ring is provided inside the nut. The stop part is provided on the nut.

[0013] A water outlet pipe is provided at the rear end of the guide channel.

[0014] A drain outlet is provided at the lower part of the housing.

[0015] The beneficial effects of this invention are as follows: After the filter device rotates to its position with the rotating plate, it corresponds to the extended end of the sewage pipe. When the electromagnet is energized, the annular connecting plate is attracted to the annular sealing protrusion by the attraction force between the electromagnet and the permanent magnet. The annular connecting plate presses against the first sealing ring to achieve a seal between the two. At the same time, the corrugated pipe is stretched and fitted onto the extended end, realizing the connection between the sewage pipe and the first cylindrical filter screen for sewage to pass through, achieving automatic adsorption and sealing. When the filter device becomes clogged, the sewage pipe is shut off, and the electromagnet is energized in the opposite direction. The repulsive force of like poles causes the corrugated pipe to retract and separate from the extended end, as well as the annular connecting plate to separate from the extended end. This avoids interference between the corrugated pipe and the annular connecting plate and the extended end when the rotating plate rotates. Rotating the rotating plate rotates another filter device to correspond to the extended end of the sewage pipe, and then repeating the above actions. The clogged filter device can be replaced or cleaned through the maintenance door for the next use. Replacement or maintenance does not require shutting down the sewage pipe, does not affect sewage treatment, and does not require disassembly of the sewage pipe. Compared with existing technologies, the sulfur-iron autotrophic denitrification biological denitrification device of this application can greatly shorten the filter replacement time, improve the wastewater treatment efficiency, and is easy to use. Attached Figure Description

[0016] Figure 1This is a schematic diagram of the structure of an embodiment of a sulfur-iron autotrophic denitrification biological denitrification device of the present invention;

[0017] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0018] Figure 3 yes Figure 1 A magnified view of a section at point B in the middle;

[0019] Figure 4 yes Figure 3 A magnified view of a section at point C;

[0020] Explanation of reference numerals in the attached drawings: 1. Housing; 2. Sewage pipe; 3. Support leg; 4. Sewage outlet; 5. Drive motor; 6. Rotating plate; 7. Filter screen device; 8. First cylindrical filter screen; 9. First limiting protrusion; 10. Second limiting protrusion; 11. Guide elongated hole; 12. Drive plate; 13. Drive cylinder; 14. Second cylindrical filter screen; 15. Guide channel; 16. Water outlet pipe; 17. Extended end; 18. Corrugated pipe; 19. Annular connecting plate ; 20. Annular sealing protrusion; 21. Electromagnet; 22. Permanent magnet; 23. First sealing ring; 24. First inclined surface; 25. Second inclined surface; 26. Second sealing ring; 27. Bottom plate of the second cylindrical filter screen; 28. Connecting hole; 29. ​​Filter cylinder; 30. Stop bar; 31. Blocking part; 32. Bottom plate of the filter cylinder; 33. Nut; 34. Top pressure bar; 35. Mounting ring; 36. Stop part; 37. Mounting step. Detailed Implementation

[0021] To facilitate understanding of the present invention, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0022] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The use of "belonging" in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0023] An embodiment of the sulfur-iron autotrophic denitrification biological nitrogen removal device of the present invention, such as... Figures 1-4As shown, the device includes a housing 1 with supporting legs 3 at the bottom and a sewage pipe 2 at the top. The sewage pipe has an extension end 17 that extends inward from the inner wall of the housing. A rotating plate 6 is rotatably mounted inside the housing, and a drive motor 5 is mounted on the housing to drive the rotating plate. At least two filter screen devices 7 are mounted on the rotating plate, corresponding to the extension ends as the plate rotates. In this embodiment, there are two filter screen devices, arranged opposite each other. This arrangement allows one filter screen device to connect to the sewage pipe at the top while the other is located at the bottom. An inspection door (not shown in the figure) is provided on the lower side wall of the housing for easy replacement, cleaning, and maintenance of the lower filter screen device.

[0024] In this embodiment, the filter device 7 includes a first cylindrical filter 8. The bottom of the first cylindrical filter is a filtration section. A guide channel 15 is provided inside the housing below the filtration section. The guide channel is inclined, and an outlet pipe 16 is provided at the rear end of the guide channel for easy connection to the subsequent biological denitrification tower. The connection between the first cylindrical filter and the protruding end of the sewage pipe is as follows: a corrugated pipe 18 is sealed at the end of the first cylindrical filter facing the protruding end (i.e., the inlet end), such as... Figure 2 As shown, an annular connecting plate 19 is provided at the inlet of the corrugated pipe, and a sealing structure is provided between the annular connecting plate and the protruding end. Specifically, the sealing structure includes an annular sealing protrusion 20 provided on the outer wall of the protruding end, and multiple electromagnets 21 are arranged circumferentially on the annular sealing protrusion. Multiple permanent magnets 22 corresponding to the electromagnets are provided on the annular connecting plate, and the number of permanent magnets and electromagnets are equal and correspondingly arranged. A first sealing ring 23 is provided on the side of the annular sealing protrusion facing the annular connecting plate for sealing cooperation with the annular connecting plate. In this embodiment, after the electromagnet is energized, the permanent magnet is attracted by the electromagnet, which causes the corrugated pipe to extend and fit on the protruding end. At the same time, the annular connecting plate presses on the first sealing ring to achieve a seal between it and the annular sealing protrusion, thus achieving sealing and communication between the sewage pipe and the first cylindrical filter screen, allowing sewage to pass smoothly. When the electromagnet is energized in the reverse direction, it repels the permanent magnet. The repulsive force between the two forces causes the bellows to retract and separate from the protruding end, as well as the annular connecting plate to separate from the protruding end. After separation, the electromagnet is de-energized to prevent interference between the bellows, the annular connecting plate and the protruding end when the rotating plate rotates.

[0025] Because the sewage exerts a significant impact on the filter device when it passes through it, if the filter device is fixedly mounted on the rotating plate, both the rotating plate and the drive motor will be affected by the long-term impact of the water flow, thus affecting their service life. In this embodiment, the rotating plate is provided with mounting holes for the horizontally guided movement of each first cylindrical filter screen. A first limiting protrusion 9 is provided on one side of the first cylindrical filter screen on the rotating plate, and a second limiting protrusion 10 is provided on the other end of the rotating plate. This prevents the horizontal position of the first cylindrical filter screen from deviating excessively during the rotation of the rotating plate. The distance between the first and second limiting protrusions is slightly greater than the horizontal thickness of the rotating plate. "Slightly greater" can be understood as the first cylindrical filter screen being able to move a certain amount horizontally within the mounting holes, but this movement is relatively small. Moving the first cylindrical filter screen backward to its extreme position will not affect the electromagnet's attraction to the permanent magnet when the filter device rotates to correspond with the sewage pipe, and moving the first cylindrical filter screen forward to its extreme position will not cause collision or interference between the annular connecting plate and the protruding end of the sewage pipe. If the distance between the two is too large, the filter device can move horizontally in the mounting hole. Due to the uneven weight distribution of the filter device and the influence of the installation position, the horizontal position of the filter device will deviate excessively as the rotating plate rotates. If the forward deviation is too large, the filter device will interfere with the sewage pipe during the rotation of the rotating plate. If the backward deviation is too large, the electromagnet will not be able to attract the permanent magnet when the rotating plate reaches the set position. In this embodiment, the distance between the first limiting protrusion and the second limiting protrusion minus the horizontal thickness of the rotating plate (that is, the horizontal movement distance of the first cylindrical filter screen in the mounting hole) should be less than the expansion and contraction length of the bellows after being attracted or repelled by the electromagnet.

[0026] The housing is equipped with a first driving mechanism that drives the second limiting protrusion to bring the end of the first cylindrical filter screen closer to the protruding end. The first driving mechanism includes a driving cylinder 13, on which a driving plate 12 is mounted. The housing is provided with a guide elongated hole 11 for the driving plate to move horizontally back and forth. The driving plate is horizontally guided and installed in the guide elongated hole. There is an overlap between the driving plate and the second limiting protrusion in the vertical direction, and the overlap serves as a stop. Specifically, under the action of the driving cylinder, the driving plate pushes the second limiting protrusion horizontally forward, thereby moving the first cylindrical filter screen forward, that is, moving the first cylindrical filter screen closer to the protruding end of the sewage pipe. When the electromagnet is energized, the seal is achieved by the attraction force between the electromagnet and the permanent magnet. The function of the first driving mechanism is not only to increase the attraction force of the electromagnet on the permanent magnet, but also to increase the first cylindrical filter screen's resistance to the impact force of sewage, ensuring the stability of the first cylindrical filter screen's position, transferring the hydraulic impact force to the driving plate, and protecting the rotating plate and the driving motor. Moreover, the setting of the driving plate also ensures the sealing between the annular connecting plate and the annular sealing protrusion. The separation between the annular connecting plate and the annular sealing protrusion, as well as the separation between the corrugated pipe and the protruding end of the sewage pipe, both rely on the repulsive force between the electromagnet and the permanent magnet. To enhance the sealing effect, a first inclined surface 24 is provided on the inner wall of the annular connecting plate, and a second inclined surface 25 is correspondingly provided on the outer surface of the protruding end. A second sealing ring 26 is provided on the second inclined surface.

[0027] A second cylindrical filter 14 is sealed on the outer rear end of the first cylindrical filter 8, such as... Figure 3 As shown, a two-stage filtration structure is formed. In this embodiment, the two-stage filtration is not for more refined filtration, but rather to extend the service life of a filter device, reducing the need for frequent replacement or cleaning. Specifically, a connecting hole 28 is provided on the outer wall of the first cylindrical filter located inside the second cylindrical filter. The connecting hole is used to connect the first and second cylindrical filters. The bottom plate 27 of the second cylindrical filter is a porous filter plate to realize the filtration function of the second cylindrical filter. A filter cylinder 29 is provided as an internal guide for the first cylindrical filter. The bottom plate 32 of the filter cylinder is a porous plate to form the filtration part of the first cylindrical filter. A stop bar 30 is provided on the inner wall of the first cylindrical filter behind the filter cylinder. The stop bar can be broken, and the breaking force of the stop bar needs to be set according to the water pressure.

[0028] In this embodiment, the filter cylinder 29 is stopped and limited by the stop clip 30 under the impact of water flow. At this time, the filter cylinder has a blocking part 31 for blocking the connecting hole 28. Wastewater passes through the first cylindrical filter screen and then through the filter cylinder. The filtered water enters the second cylindrical filter screen but does not pass through the connecting hole. After the filter cylinder is blocked by impurities, the water pressure in the first cylindrical filter screen increases. When the pressure reaches a certain level, the stop clip 30 breaks under the pressure of the wastewater. The filter cylinder is moved backward by the water flow, causing the blocking part 31 to open the connecting hole 28. At this time, the wastewater enters the second cylindrical filter screen through the connecting hole, and the first cylindrical filter screen loses its filtering function. The first cylindrical filter screen is provided with a stop part to limit the filter cylinder that is moved backward by the water flow after the stop clip breaks, preventing the filter cylinder from falling off the first cylindrical filter screen. Specifically, the rear end of the first cylindrical filter screen is open, and an installation step 37 is provided at the opening. Figure 4 As shown, an installation ring 35 is installed on the installation step, and a stop strip 30 is provided on the inner wall of the installation ring. The installation ring and the stop strip can be integrally formed. When the stop strip is damaged, only the installation ring and the stop strip need to be replaced, without replacing the entire first cylindrical filter screen, which greatly reduces costs. A nut 33 is threadedly connected to the first cylindrical filter screen. A pressure strip 34 is provided inside the nut to press and fix the installation ring, which facilitates the disassembly and replacement of the installation ring. The nut is provided with the aforementioned stop part. Specifically, the nut is provided with a through hole for the rear part of the filter cartridge to pass through. The hole edge 36 of the through hole is used to limit and stop the blockage part of the filter cartridge. The second cylindrical filter screen and the first cylindrical filter screen can also be connected by threads, which facilitates the disassembly of the second cylindrical filter screen, the replacement of the installation ring, and the cleaning of the filter cartridge. A drain port is provided at the bottom of the shell, which can promptly discharge sewage in the shell in case of leakage.

[0029] During use, before sewage is injected, the sewage filter device rotates with the rotating plate to its designated position, aligning with the protruding end of the sewage pipe. The first cylindrical filter screen moves forward to its limit position (where the second limit protrusion contacts the rotating plate) via the action of the drive plate and the second limiting protrusion. At this point, the drive plate only acts as a limit stop; no active pressure is required on the second limiting protrusion. Then, the electromagnet is energized. The attraction between the electromagnet and the permanent magnet causes the annular connecting plate to adhere to the annular sealing protrusion. The annular connecting plate presses against the first sealing ring, achieving a seal. Simultaneously, the bellows is elongated and fitted onto the protruding end, connecting the sewage pipe to the first cylindrical filter screen, allowing sewage to pass through and achieving automatic adsorption and sealing. When sewage is injected, if the first cylindrical filter screen becomes clogged, the pressure increases to a set value, breaking the stop bar. The filter cylinder is then pushed backward by the water pressure, opening the connecting hole at the clogged part. Filtration then occurs through the second cylindrical filter screen, extending the lifespan of the filter device. When the second cylindrical filter screen also becomes clogged, meaning the entire filter device cannot perform its filtering function, the sewage pipe is shut off, and the electromagnet is reverse-energized. The repulsive force of like poles causes the bellows to retract and detach from the protruding end, as well as the annular connecting plate, preventing interference between the bellows, annular connecting plate, and the protruding end during the rotation of the rotating plate. At this point, the drive plate can be moved away from the second limiting protrusion. Then, the rotating plate is rotated to align the other filter device with the protruding end of the sewage pipe. The above actions are repeated to achieve automatic adsorption and sealing, allowing sewage injection to continue. The clogged filter device is now located at the bottom, and can be replaced or cleaned through the inspection door for future use. Replacement, repair, or cleaning does not require shutting down the sewage pipe, does not affect sewage treatment, and does not require disassembly of the sewage pipe. Compared to existing technologies, this significantly shortens filter replacement time, improves sewage treatment efficiency, and is convenient to use.

[0030] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "linked" should be interpreted broadly. For example, the term "linked" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the devices or elements involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0032] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.

[0033] In other embodiments of the present invention, the number of filter screen devices on the rotating plate can be adjusted according to actual needs, and can be more than two, for example, three or more; when the first sealing ring can ensure the sealing effect between the annular connecting plate and the annular sealing protrusion, the second sealing ring may not be provided; the rear end of the guide groove may not be provided with a water outlet pipe, but can extend directly to the rear.

Claims

1. A sulfur-iron autotrophic denitrification biological nitrogen removal device, characterized in that: The system includes a housing, with a sewage pipe at the top and an extension end extending inward from the inner wall of the housing. Inside the housing, a rotating plate is rotatably mounted, with at least two filter devices that rotate with the plate and correspond to the extension ends. Each filter device includes a first cylindrical filter screen, the bottom of which is a filtration section. A guide groove is located below the filtration section inside the housing. A bellows is sealed at the end of the first cylindrical filter screen facing the extension end, with an annular connecting plate at the inlet. A sealing structure is provided between the annular connecting plate and the extension end. The sealing structure includes an annular sealing protrusion on the outer wall of the extension end, with multiple electromagnets spaced circumferentially on the annular sealing protrusion. Multiple permanent magnets corresponding to the electromagnets are mounted on the annular connecting plate. A first sealing ring is provided on the side of the annular sealing protrusion facing the annular connecting plate for sealing cooperation with the annular connecting plate. When the electromagnets are energized, they attract the permanent magnets, causing the bellows to extend and fit onto the extension end, and the annular connecting plate to press against it. A seal is achieved between the first sealing ring and the annular sealing protrusion; when the electromagnet is reverse-energized, it repels the permanent magnet, causing the bellows to retract and separate from the protruding end, and the annular connecting plate to separate from the protruding end, thus avoiding interference between the bellows and the annular connecting plate and the protruding end when the rotating plate rotates; an inspection door is provided on the lower side wall of the housing; a second cylindrical filter screen is sealed on the outer rear end of the first cylindrical filter screen; a connecting hole is provided on the outer side wall of the first cylindrical filter screen located inside the second cylindrical filter screen; a filter cylinder is guided inside the first cylindrical filter screen, and the bottom plate of the filter cylinder is a porous plate forming the filtering part of the first cylindrical filter screen; a stop bar is provided on the inner wall of the first cylindrical filter screen behind the filter cylinder; the filter cylinder has a blocking part that blocks the connecting hole after being stopped and limited by the stop bar under the impact of water flow; when the filter cylinder is blocked by impurities and the water pressure increases, the stop bar is broken under the sewage pressure, and the filter cylinder is moved backward by the water flow to allow the blocking part to open the connecting hole.

2. The sulfur-iron autotrophic denitrification biological nitrogen removal device according to claim 1, characterized in that: The rotating plate is provided with mounting holes for the horizontally guided movement of each first cylindrical filter screen. The first cylindrical filter screen is provided with a first limiting protrusion on one side of the rotating plate and a second limiting protrusion on the other end of the rotating plate to prevent the horizontal position of the first cylindrical filter screen from deviating excessively during the rotation of the rotating plate. The distance between the first limiting protrusion and the second limiting protrusion is slightly greater than the horizontal thickness of the rotating plate.

3. The sulfur-iron autotrophic denitrification biological nitrogen removal device according to claim 2, characterized in that: The housing is provided with a first driving mechanism that drives the second limiting protrusion to bring the end of the first cylindrical filter screen close to the protruding end, which can increase the first cylindrical filter screen's ability to withstand the impact of sewage and ensure the sealing between the annular connecting plate and the annular sealing protrusion.

4. The sulfur-iron autotrophic denitrification biological nitrogen removal device according to claim 1, characterized in that: The inner wall of the annular connecting plate is provided with a first inclined surface, and the outer side of the extended end is provided with a corresponding second inclined surface, and a second sealing ring is provided on the second inclined surface.

5. The sulfur-iron autotrophic denitrification biological nitrogen removal device according to claim 1, characterized in that: The first cylindrical filter screen is provided with a stop part to limit the filter cylinder that is moved backward by the water flow after the stop bar breaks, and to prevent it from falling off the first cylindrical filter screen.

6. The sulfur-iron autotrophic denitrification biological nitrogen removal device according to claim 5, characterized in that: The first cylindrical filter screen has an opening at its rear end, and an installation step is provided at the opening. An installation ring is installed on the installation step, and a stop strip is provided on the inner wall of the installation ring. A nut is threadedly connected to the first cylindrical filter screen, and a pressure strip for pressing and fixing the installation ring is provided inside the nut. The stop part is provided on the nut.

7. The sulfur-iron autotrophic denitrification biological nitrogen removal device according to claim 1, characterized in that: A water outlet pipe is provided at the rear end of the guide channel.

8. The ferrosulfide autotrophic denitrification biological nitrogen removal device according to claim 1, characterized in that: A drain outlet is provided at the lower part of the housing.

Images