An aerobic granular sludge screening device

Abstract

The application discloses an aerobic granular sludge screening device and belongs to the technical field of sewage treatment. The device comprises a box body, a sedimentation zone is formed in the box body by a partition plate, a filtering mechanism for screening aerobic granular sludge is arranged in the sedimentation zone, the filtering mechanism comprises a rotating pipe arranged in the sedimentation zone in the vertical direction, and a filter screen arranged in a fan-shaped structure and arranged in a ring array at the outer circumferential surface of the rotating pipe. The filter screen is fixed in the circumferential direction of the rotating pipe and axially slidably connected with the rotating pipe, and the filter screen is elastically connected with the rotating pipe. The filter screen is instantaneously lowered through the recessed structure of the limiting plate, the aerobic granular sludge is quickly separated from the filter screen with the help of inertia and water buoyancy, the traditional operation mode of the mechanical scraping and pushing of the mud scraping arm is abandoned, the extrusion and shearing force is completely eliminated, the granular sludge is effectively prevented from being broken and damaged, the sludge bacterial activity and the original particle size structure are completely retained, and the stability of the sludge settling performance of the system is ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an aerobic granular sludge screening device. Background Technology

[0002] Aerobic granular sludge (AGS) has advantages such as good settling performance, high biomass, and strong simultaneous nitrogen and phosphorus removal capabilities, and has been widely used in the field of wastewater treatment. In continuous flow wastewater treatment systems, sedimentation tanks are responsible for sludge-water separation and sludge return. To maintain the proportion of highly active aerobic granular sludge in the system, the settled sludge needs to be screened, and only large-diameter, highly active granular sludge is returned to the biological treatment tank, while fine flocculent sludge, aged sludge, and inorganic impurities are discharged.

[0003] Existing aerobic granular sludge screening devices mostly adopt a structure of fixed filter screen combined with scraper arm. The scraper arm pushes the large granular sludge particles trapped on the filter screen to the return port. However, in actual operation, granular sludge particles with a similar pore size to the filter screen are easily stuck in the filter pores. During the pushing process, the scraper arm will exert a squeezing and shearing effect on the stuck particles, directly causing the aerobic granular sludge to break, resulting in the loss of granular sludge in the system, decreased settling performance, and reduced biological treatment efficiency.

[0004] Therefore, it is necessary to provide an aerobic granular sludge screening device to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide an aerobic granular sludge screening device to solve the technical problems mentioned in the background art.

[0006] Based on the above ideas, the present invention provides the following technical solution: an aerobic granular sludge screening device, comprising a housing, wherein the housing is divided into sedimentation zones by partitions, and a filtration mechanism for screening aerobic granular sludge is provided in the sedimentation zones, the filtration mechanism comprising: The rotating tube is vertically positioned within the sedimentation zone; The filter screen is configured with a fan-shaped structure and arranged in a ring array on the outer circular surface of the rotating tube. The filter screen is circumferentially fixed and axially slidingly fitted with the rotating tube, and the filter screen is elastically connected to the rotating tube. A limiting plate is located in the sedimentation zone and below the filter screen. Along the axis of the rotating tube, the limiting plate has a recessed portion, and the two ends of the recessed portion are respectively set as a vertical section and an inclined section. During the process of the rotating tube driving the filter screen to rotate circumferentially, the support fixed to the bottom of the filter screen moves to the recessed portion and falls down in a direction parallel to the axis of the rotating tube, so that the aerobic granular sludge separates from the filter screen.

[0007] As a further aspect of the present invention: a guide hopper is provided in the sedimentation zone, the filter screen is located inside the guide hopper, and the guide hopper is provided with a slot that communicates with an external return pipe. The recessed portion and the slot are aligned along the diameter direction of the rotating pipe, so that the aerobic sludge particles above the filter screen can be drawn into the return pipe through the slot.

[0008] As a further aspect of the present invention: the rotating tube has multiple sets of through drainage grooves on its wall, the drainage grooves are located above the filter screen, and a plunger is provided inside the rotating tube. As the plunger moves downward relative to the rotating tube, the water inside the rotating tube can be squeezed out through the drainage grooves and form an isolation layer on top of the filter screen.

[0009] As a further embodiment of the present invention: baffles are fixedly provided on both sides of the top of the filter screen, the drainage trough is located between the baffles on both sides of the top of the filter screen, a flow-blocking plate is fixedly connected to the feed hopper at the opening of the trough, a channel for water to pass through is left between the flow-blocking plate and the rotating pipe, and a stop part is provided on both sides of the bottom of the flow-blocking plate; when the filter screen rotates to the opening of the trough, the baffles on both sides of the top of the filter screen come into contact with the stop part to prevent water in the sedimentation zone from rushing into the top of the filter screen from both sides.

[0010] As a further aspect of the present invention: the rotating tube is provided with an open baffle ring, the opening of the baffle ring is arranged opposite to the groove on the guide hopper along the diameter direction of the rotating tube, and the baffle ring is fixed relative to the box. When the filter screen rotates to the vicinity of the groove, the drainage groove on the rotating tube located at the corresponding filter screen is aligned with the opening on the baffle ring.

[0011] As a further aspect of the present invention: multiple sets of limiting posts are provided on the outer wall of the rotating tube, and the multiple sets of limiting posts slide in cooperation with the rotating tube along the diameter direction of the rotating tube; a lifting rod is fixedly connected to the top of the plunger, and the lifting rod slides relative to the box body along the axis of the rotating tube. A spiral groove is provided on the outer circular surface of the lifting rod. The rotational motion of the rotating tube can be converted into the linear motion of the lifting rod in the vertical direction through the cooperation of the limiting posts and the spiral groove.

[0012] As a further aspect of the present invention: a floating ring is sleeved on the outer side of the rotating tube, the floating ring being circumferentially fixed and axially elastically fitted with the rotating tube, and an annular first magnetic element and an annular second magnetic element being fixedly provided on the inner wall of the floating ring along the axis of the rotating tube; a magnet is fixedly embedded at one end of the limiting post near the floating ring, wherein the first magnetic element and the magnet have the same poles repelling each other on their opposite sides, and the second magnetic element and the magnet have opposite poles attracting each other on their opposite sides.

[0013] As a further aspect of the present invention: a connecting rod is provided above the filter screen, the connecting rod is fixed relative to the filter screen, and multiple sets of square tubes are fixed on the outer peripheral wall of the floating ring. The top end of the connecting rod passes through the square tube and is slidably engaged with it. One end of the connecting rod passes through the square tube and extends radially along the floating ring to form a snap-fit ​​part, so that the connecting rod can drive the floating ring to move downward synchronously.

[0014] As a further aspect of the present invention, the flow-blocking ring is fixedly connected to the housing.

[0015] As a further aspect of the present invention: multiple sets of partitions are fixedly installed inside the box, which sequentially divide the internal space of the box into an anaerobic zone, an aerobic zone, an anoxic zone, and a sedimentation zone. The return pipe can draw aerobic granular sludge from above the filter screen into the aerobic zone.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention utilizes the recessed structure of the limiting plate to achieve instantaneous drop of the filter screen. With the help of inertia and buoyancy of the water, the aerobic granular sludge is quickly separated from the filter screen. This eliminates the traditional mechanical scraping and pushing operation of the sludge scraper arm, completely eliminates the squeezing and shearing forces, effectively avoids the breakage and damage of the granular sludge, and fully preserves the activity of the sludge bacteria and the original particle size structure, ensuring the stable sludge settling performance of the system.

[0017] 2. This invention uses a rotating pipe with an internal drainage structure to direct water flow and form a water flow isolation layer on the filter screen surface. This effectively prevents particulate sludge from re-embedding into the filter holes, which helps improve sludge desorption, reduces the frequency of filter screen clogging, and reduces the workload of equipment maintenance and cleaning.

[0018] 3. In this invention, the filter screen falling action and the drainage and water supply action are automatically and synchronously completed, without the need for additional independent drive components, and the overall structure is compact.

[0019] 4. By setting baffles, flow deflectors and stop sections, the water flow in the screening area can be directed, which can not only block the interference of lateral turbulence, but also push the sludge to converge at the trough opening, so as to fully discharge the sludge, effectively reduce the sludge residue on the filter screen surface, and improve the sludge screening recovery rate and return conveying efficiency. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the present invention; Figure 3 This is a schematic diagram of the internal structure of the sedimentation zone of the present invention; Figure 4This is a schematic diagram of the cooperation between the support member and the limiting plate of the present invention; Figure 5 This is a schematic diagram of the flow-blocking plate and the stop portion of the present invention; Figure 6 This is a schematic diagram of the limiting plate structure of the present invention; Figure 7 This is a schematic diagram of the cooperation between the rotating tube and the baffle ring of the present invention; Figure 8 This is a schematic diagram of the spiral groove structure of the present invention; Figure 9 This is the present invention. Figure 5 A magnified structural diagram at point A; Figure 10 This is the present invention. Figure 5 A magnified structural diagram at point B; Figure 11 This is the present invention. Figure 7 A magnified structural diagram at point C.

[0022] In the diagram: 1. Box body; 101. Sedimentation zone; 2. Support frame; 3. Baffle; 4. Return pipe; 5. Feed hopper; 501. Groove; 6. Filter screen; 7. Baffle; 8. Elastic component; 9. Support component; 10. Limiting plate; 1001. Vertical section; 1002. Recessed part; 1003. Inclined section; 11. Rotating pipe; 1101. Drainage trough; 12. Annular component; 13. Baffle plate; 13 01. Stop; 14. Lifting rod; 1401. Keyway; 1402. Piston; 1403. Spiral groove; 15. Floating ring; 1501. Square tube; 1502. First magnetic component; 1503. Second magnetic component; 16. Positioning groove; 17. Limiting post; 18. One-way valve; 19. Baffle ring; 1901. Opening; 20. Connecting rod; 2001. Snap-fit ​​part; 21. Base plate. Detailed Implementation

[0023] like Figures 1 to 11 As shown, an aerobic granular sludge screening device includes a tank 1 for treating wastewater. Multiple sets of partitions 3 are fixedly installed inside the tank 1, sequentially dividing the internal space into an anaerobic zone, an aerobic zone, an anoxic zone, and a sedimentation zone 101, with each zone interconnected. Pre-prepared aerobic granular sludge is added to the aerobic zone. This aerobic granular sludge is externally pre-cultured mature spherical granular sludge, used to achieve simultaneous nitrification, phosphorus uptake, and organic matter degradation under aerobic conditions, constituting the core biochemical reaction unit of the system.

[0024] The sedimentation zone 101 is equipped with a filtration mechanism for the non-destructive screening of large, highly active aerobic sludge particles and their directional return to the aerobic zone. The device also includes multiple sets of pipelines for the introduction, transport, and discharge of wastewater. The aforementioned pipeline connections, water flow control, and conventional supporting structures can all be implemented using mature existing technologies, and will not be elaborated upon here.

[0025] The following is a detailed description of the specific structure of the filtration mechanism: The filtration mechanism includes a rotating tube 11 vertically positioned at the center of the sedimentation zone 101. Multiple sets of fan-shaped filter screens 6 are arranged near the bottom of the outer circumference of the rotating tube 11, forming a ring structure. The filter screens 6 are circumferentially fixed to the rotating tube 11 and axially slidingly fitted, and are elastically connected to the rotating tube 11 along a direction parallel to its axis.

[0026] A guide hopper 5 is provided on the outer side of the rotating tube 11. The guide hopper 5 is fixedly installed inside the sedimentation zone 101 and is used to guide the settled aerobic granular sludge to the position of the filter screen 6, so as to facilitate the classification and collection of granular sludge. The lower half of the guide hopper 5 is an annular part, and the end of the filter screen 6 away from the rotating tube 11 is in contact with the inner wall of the annular part. A through slot 501 is opened on the annular part, and the slot 501 is located above the filter screen 6. A return pipe 4 is installed on the side of the box body 1. One end of the return pipe 4 is connected to the slot 501, so that the large aerobic granular sludge particles intercepted at the top of the filter screen 6 can be sucked to the external pipeline through the return pipe 4 and finally returned to the aerobic zone.

[0027] During the sedimentation process of the mixed liquor in the sedimentation zone 101, large-diameter aerobic granular sludge is trapped at the top of the filter screen 6, while fine flocculent sludge and inorganic impurities pass through the filter screen 6 and fall into the sludge hopper below the sedimentation zone 101. As the rotating pipe 11 drives multiple sets of filter screens 6 to rotate synchronously, the large-diameter aerobic granular sludge trapped at the top of each set of filter screens 6 can be directionally discharged through the trough 501 in sequence.

[0028] Due to the uneven particle size of aerobic granular sludge, some particles with a particle size close to that of the filter screen 6 are easily stuck above the filter screen, resulting in poor sludge flowability and making it difficult to smoothly export the aerobic granular sludge on the filter screen 6 through the slot 501.

[0029] To address the aforementioned issues, this solution includes an annular limiting plate 10 positioned within the sedimentation zone 101, below the filter screen 6. Combined with... Figures 4 to 6As shown, along the axial direction of the rotating tube 11, the limiting plate 10 is provided with a recessed portion 1002, and the recessed portion 1002 and the groove 501 are aligned radially with each other along the rotating tube 11; the two ends of the recessed portion 1002 are respectively connected to the body of the limiting plate 10 through a vertical section 1001 and an inclined section 1003.

[0030] A columnar support member 9 is fixed to the bottom of the filter screen 6. The end of the support member 9 away from the filter screen 6 abuts against the side surface of the limiting plate 10 near the filter screen 6. When the rotating tube 11 drives the filter screen 6 to rotate circumferentially and moves the support member 9 to the side of the recess 1002, the support member 9 passes the vertical section 1001 and falls instantly into the recess 1002. The filter screen 6 sinks instantaneously, and the aerobic granular sludge on its top remains momentarily still under the action of inertia and buoyancy of the water, thus achieving a brief separation from the filter screen 6 to improve the fluidity of the aerobic granular sludge and facilitate its smooth discharge through the return pipe 4.

[0031] It should be noted that baffles 7 are fixedly provided on both sides of the top of the filter screen 6. The baffles 7 are in contact with the inner wall of the annular part of the guide hopper 5, so that the adjacent filter screens 6 are isolated from each other, work independently and do not interfere with each other.

[0032] Furthermore, a lifting rod 14 is provided near the top of the rotating tube 11. A plunger 1402 is fixedly installed at one end of the lifting rod 14 within the inner cavity of the rotating tube 11, and the plunger 1402 is in a sealing fit with the inner wall of the rotating tube 11. Multiple sets of drainage grooves 1101 are formed on the wall of the rotating tube 11. The multiple sets of drainage grooves 1101 are all located above the filter screens 6 and are arranged one-to-one with each set of filter screens 6, so that the water inside the rotating tube 11 can be discharged to the top of the filter screens 6 through the drainage grooves 1101.

[0033] When the filter screen 6 rotates circumferentially with the rotating tube 11 and the support 9 aligns with the recessed part 1002, the filter screen 6 falls instantaneously along the axial direction of the rotating tube 11, causing the aerobic granular sludge to temporarily separate from the filter screen 6, thus increasing the freedom of sludge flow. At the same time, the lifting rod 14 drives the plunger 1402 to move axially downward within the rotating tube 11, squeezing the water in the tube through the drainage channel 1101 and allowing it to flow on top of the filter screen 6. The rapidly flowing water forms an isolation layer on the surface of the filter screen 6, preventing the aerobic granular sludge from re-entering the filter holes, keeping the sludge on top of the filter screen 6 in a separated state and allowing it to be smoothly discharged, preventing sludge residue from accumulating and becoming difficult to clean.

[0034] Combination Figures 5-7As shown, the rotating tube 11 is equipped with a baffle ring 19 with an opening 1901 inside. The opening 1901 of the baffle ring 19 and the slot 501 on the guide hopper 5 are arranged radially opposite to each other along the rotating tube 11, and the baffle ring 19 is fixedly arranged relative to the housing 1. When the filter screen 6 rotates to the vicinity of the slot 501, the drainage groove 1101 on the rotating tube 11 corresponding to the filter screen 6 aligns with the opening 1901 of the baffle ring 19.

[0035] With this structure, the water in the rotating pipe 11 can only be discharged to the top of the corresponding filter screen 6 through the opening 1901 of the baffle ring 19 and the corresponding drainage channel 1101, which effectively increases the water flow speed and facilitates the stable formation of an isolation layer on the top of the filter screen 6, further preventing aerobic granular sludge from getting stuck in the filter holes again.

[0036] The axial movement of the filter screen 6 relative to the rotating tube 11 and the axial movement of the lifting rod 14 relative to the rotating tube 11 are coupled and linked through a limiting component. When the support 9 is aligned with the recess 1002, the rotating tube 11 can automatically cooperate to drive the lifting rod 14 to move axially, so that the filter screen 6 falls instantly and the drainage action is performed synchronously, improving the overall coordination and reliability of the device.

[0037] The limiting assembly includes multiple sets of limiting posts 17 disposed on the rotating tube 11; the multiple sets of limiting posts 17 are evenly arranged along the circumference of the rotating tube 11, and the limiting posts 17 slide in contact with the rotating tube 11 radially. Figure 8 As shown, the outer circular surface of the lifting rod 14 is provided with a spiral groove 1403.

[0038] When the lifting rod 14 is restricted to circumferential rotation and the end of the limiting post 17 is inserted into the spiral groove 1403, the rotational motion of the rotating tube 11 can be converted into the vertical lifting motion of the lifting rod 14 through the cooperation of the limiting post 17 and the spiral groove 1403, thereby providing driving force for the water in the rotating tube 11 to be discharged through the drainage groove 1101.

[0039] A floating ring 15 is sleeved on the outer side of the rotating tube 11. The floating ring 15 is circumferentially fixed and axially elastically fitted with the rotating tube 11. Figure 7 , Figure 11 As shown, the inner wall of the floating ring 15 is fixedly provided with a ring-shaped first magnetic element 1502 and a ring-shaped second magnetic element 1503 along the axis of the rotating tube 11; a magnet is fixedly embedded at one end of the limiting post 17 near the floating ring 15, wherein the first magnetic element 1502 and the magnet have the same poles repelling each other, and the second magnetic element 1503 and the magnet have opposite poles attracting each other.

[0040] Furthermore, a connecting rod 20 is provided above the filter screen 6. The bottom end of the connecting rod 20 is fixed to the baffle 7 via a plate-shaped fixing member, allowing the connecting rod 20 to move up and down synchronously with the filter screen 6. Multiple sets of square tubes 1501 are fixed to the outer peripheral wall of the floating ring 15. The top end of the connecting rod 20 passes through the square tube 1501 and slides with it; combined with... Figure 9 As shown, the connecting rod 20 passes through one end of the square tube 1501 and extends radially along the floating ring 15 to form a snap-fit ​​part 2001, so that the connecting rod 20 can drive the floating ring 15 to move downward synchronously.

[0041] In summary, large-diameter aerobic granular sludge in the sedimentation zone 101 is trapped by the filter screen 6 during the settling process, while fine flocculent sludge and inorganic impurities pass through the filter screen 6 and fall into the sludge hopper below the sedimentation zone 101, achieving particle size classification and screening. During the rotation of the filter screen 6 driven by the rotating tube 11, the support 9 at the bottom of the filter screen 6 aligns with the recess 1002 on the limiting plate 10, causing the filter screen 6 to sink instantaneously along the axis of the rotating tube 11. Utilizing inertia and buoyancy, the aerobic granular sludge is instantly separated from the surface of the filter screen 6, significantly improving sludge flowability. At the same time, when the filter screen 6 falls, the floating ring 15 moves down synchronously through the connecting rod 20, so that the first magnetic element 1502 on the inner wall of the floating ring 15 is aligned with the limiting post 17. Under the action of magnetic repulsion, the limiting post 17 tends to move closer to the lifting rod 14. When one end of the limiting post 17 is aligned with the spiral groove 1403 and inserted into the spiral groove 1403, the rotational motion of the rotating tube 11 can be converted into the vertical motion of the lifting rod 14 through the cooperation of the limiting post 17 and the spiral groove 1403. Then, the water in the rotating tube 11 is squeezed out through the drain trough 1101 through the plunger 1402, forming a stable water flow isolation layer at the top of the filter screen 6, preventing the aerobic granular sludge from being re-stuck in the filter holes, so that the sludge can maintain a high degree of freedom of flow and be smoothly sucked out through the return pipe 4 and returned to the aerobic zone.

[0042] Compared with the traditional method of directly pushing sludge with scraper arms, this solution involves no mechanical scraping, no squeezing or shearing, and no hard contact throughout the process, thus avoiding damage and breakage of aerobic granular sludge and protecting the integrity and biological activity of the particles to the greatest extent. It can significantly improve the stability and service life of aerobic granular sludge systems and is more suitable for wastewater treatment scenarios with long-term continuous operation.

[0043] Combination Figure 5 As shown, the guide hopper 5 is fixedly equipped with a baffle plate 13 at the trough opening 501, and rubber stop parts 1301 are fixedly attached to both sides of the bottom of the baffle plate 13. When the filter screen 6 rotates to the position of the trough opening 501, the baffles 7 on both sides of the top of the filter screen 6 come into contact with the stop parts 1301, preventing water in the sedimentation zone 101 from flowing from both sides of the filter screen 6 into the top of the filter screen 6, thus ensuring the directionality and stability of the backflow suction.

[0044] A water passage is provided between the baffle plate 13 and the rotating pipe 11, through which the water in the sedimentation zone 101 can flow to the top of the filter screen 6. This facilitates the pushing of aerobic granular sludge near the rotating pipe 11 to the trough opening 501 for smooth discharge, effectively preventing sludge residue and accumulation on the filter screen 6. The top of the baffle plate 13 is designed with an arc surface to prevent aerobic granular sludge from stagnating, adhering to the wall, and accumulating on the top of the baffle plate 13.

[0045] Combination Figures 1-3 , Figure 6 As shown, a support frame 2 is fixedly installed above the sedimentation zone 101 in the housing 1. The lifting rod 14 passes through a pre-set through hole on the support frame 2 and slides with it. Specifically, a keyway 1401 is formed on the outer circumference of the lifting rod 14 along its own axis, and a key bar is fixed to the inner wall of the through hole, which slides with the keyway 1401. The cooperation between the key bar and the keyway 1401 restricts the circumferential rotation of the lifting rod 14, so that when the limiting post 17 cooperates with the spiral groove 1403, it can stably drive the lifting rod 14 to move up and down in the vertical direction.

[0046] The rotating tube 11 is configured as a stepped shaft structure along its own axis, and the floating ring 15 is sleeved on the smaller diameter shaft section of the rotating tube 11. The floating ring 15 has an annular boss on the side away from the filter screen 6, and the boss is fixedly sleeved on the outside of the rotating tube 11; a limit spring is connected between the boss and the floating ring 15, so that the floating ring 15 and the rotating tube 11 form an elastic fit along its own axis.

[0047] When the filter screen 6 rotates out of the slot 501 of the guide hopper 5, the support 9 rises back to the top surface of the limiting plate 10 via the inclined section 1003, and the connecting rod 20 moves upward to reset; the floating ring 15 resets under the elastic force of the limiting spring, so that the second magnetic component 1503 is aligned with the limiting post 17, and the limiting post 17 is pulled out from the spiral groove 1403 under the action of magnetic attraction.

[0048] Combination Figure 3 As shown, the top of the lifting rod 14 extends radially outward to form a stop, and a return spring is connected between the stop and the support frame 2; when the limiting post 17 disengages from the spiral groove 1403, the lifting rod 14 can automatically return to its original position under the elastic force of the return spring.

[0049] Combination Figures 3-6As shown, the bottom of the sedimentation zone 101 is provided with a base plate 21, which is fixedly connected to the housing 1. An annular component 12 is rotatably installed in the mounting hole preset in the center of the base plate 21, and the filter screen 6 is disposed between the rotating tube 11 and the annular component 12. Along the axial direction of the rotating tube 11, multiple sets of positioning grooves 16 are opened on the outer circular surface of the rotating tube 11 and the inner wall of the annular component 12. Positioning blocks that slide in cooperation with the positioning grooves 16 are fixed at both ends of the filter screen 6, so that the filter screen 6 can slide relative to the rotating tube 11 along the axial direction of the rotating tube 11.

[0050] Combination Figure 4 As shown, an elastic element 8 is connected between the outer wall of the rotating tube 11 and the corresponding filter screen 6. The elastic element 8 can be a tension spring or an elastic rope. With this structure, when the support 9 moves to the recess 1002 of the limiting plate 10, the filter screen 6 can quickly sink under the action of the elastic element 8 and its own weight, realizing the instantaneous separation of aerobic granular sludge from the filter screen 6.

[0051] Depend on Figure 4 As can be seen, the limiting plate 10 and the base plate 21 are fixedly connected by a support rod.

[0052] Combination Figure 6 As shown, multiple sets of rod sleeves are fixed to the outer wall of the rotating tube 11. The connecting rod 20 passes through the rod sleeves and slides with them to ensure that the connecting rod 20 rises and falls stably in the vertical direction.

[0053] Combination Figure 7 As shown, a one-way valve 18 is installed on the rotating pipe 11, allowing water in the sedimentation zone 101 to enter the rotating pipe 11 in one direction. When the plunger 1402 moves downward inside the rotating pipe 11, the water in the rotating pipe 11 is discharged through the drain trough 1101; when the plunger 1402 returns to its original position, the water in the sedimentation zone 101 can be automatically replenished into the rotating pipe 11 through the one-way valve 18, achieving continuous water supply.

[0054] The bottom of the baffle ring 19 is fixedly provided with a disc, and a vertical rod is fixedly connected below the disc; the vertical rod passes downward through the rotating tube 11 and is fixedly connected to the housing 1, so that the baffle ring 19 remains relatively fixed.

[0055] The above-disclosed examples are merely preferred embodiments of this application, intended to facilitate understanding and implementation by those skilled in the art. However, they cannot be used to limit the scope of this application. Therefore, equivalent variations made within the scope of this application are still within the scope of this application.

Claims

1. An aerobic granular sludge screening device, comprising a housing (1), wherein the housing (1) is divided into a sedimentation zone (101) by a partition (3), and the sedimentation zone (101) is provided with a filtration mechanism for screening aerobic granular sludge, characterized in that, The filtration mechanism includes: A rotating tube (11) is vertically positioned within the sedimentation zone (101); The filter screen (6) is configured as a fan-shaped structure and arranged in a ring array on the outer circular surface of the rotating tube (11). The filter screen (6) is circumferentially fixed and axially slidingly fitted with the rotating tube (11), and the filter screen (6) is elastically connected to the rotating tube (11). The limiting plate (10) is located in the sedimentation zone (101) and below the filter screen (6). Along the axis of the rotating tube (11), the limiting plate (10) has a recess (1002), and the two ends of the recess (1002) are respectively set as a vertical section (1001) and an inclined section (1003). During the process of the rotating tube (11) driving the filter screen (6) to rotate circumferentially, the support member (9) fixed to the bottom of the filter screen (6) moves to the recess (1002) and falls down in a direction parallel to the axis of the rotating tube (11), so that the aerobic granular sludge and the filter screen (6) are separated from each other.

2. The aerobic granular sludge screening device according to claim 1, characterized in that: The sedimentation zone (101) is provided with a guide hopper (5), the filter screen (6) is located inside the guide hopper (5), and the guide hopper (5) is provided with a slot (501) that communicates with the external return pipe (4). The recess (1002) and the slot (501) are aligned along the diameter direction of the rotating pipe (11), so that the aerobic sludge particles above the filter screen (6) can be drawn into the return pipe (4) through the slot (501).

3. The aerobic granular sludge screening device according to claim 2, characterized in that: The rotating tube (11) has multiple sets of through drainage grooves (1101) on its wall. The drainage grooves (1101) are located above the filter screen (6). A plunger (1402) is installed inside the rotating tube (11). As the plunger (1402) moves downward relative to the rotating tube (11), the water in the rotating tube (11) can be squeezed out through the drainage grooves (1101) and form an isolation layer on top of the filter screen (6).

4. The aerobic granular sludge screening device according to claim 3, characterized in that: The filter screen (6) is fixedly provided with baffles (7) on both sides of the top. The drainage trough (1101) is located between the baffles (7) on both sides of the top of the filter screen (6). The guide hopper (5) is fixedly connected with a flow-blocking plate (13) at the position of the trough opening (501). A channel for water to pass through is left between the flow-blocking plate (13) and the rotating pipe (11). The bottom sides of the flow-blocking plate (13) are provided with stop parts (1301). When the filter screen (6) rotates to the trough opening (501), the baffles (7) on both sides of the top of the filter screen (6) come into contact with the stop parts (1301) to prevent water in the sedimentation zone (101) from rushing into the top of the filter screen (6) from both sides.

5. The aerobic granular sludge screening device according to claim 3, characterized in that: The rotating tube (11) is provided with a baffle ring (19) with an opening (1901). The opening (1901) of the baffle ring (19) and the slot (501) on the guide hopper (5) are arranged opposite to each other along the diameter direction of the rotating tube (11). The baffle ring (19) is fixed relative to the box (1). When the filter screen (6) rotates to the vicinity of the slot (501), the drainage groove (1101) on the rotating tube (11) located at the corresponding filter screen (6) is aligned with the opening (1901) on the baffle ring (19).

6. The aerobic granular sludge screening device according to claim 3, characterized in that: Multiple sets of limiting posts (17) are provided on the outer wall of the rotating tube (11), and the multiple sets of limiting posts (17) slide in cooperation with the rotating tube (11) along the diameter direction of the rotating tube (11); a lifting rod (14) is fixedly connected to the top of the plunger (1402), and the lifting rod (14) slides relative to the box (1) along the axis of the rotating tube (11). A spiral groove (1403) is provided on the outer circular surface of the lifting rod (14). The rotational motion of the rotating tube (11) can be converted into the linear motion of the lifting rod (14) in the vertical direction through the cooperation of the limiting posts (17) and the spiral groove (1403).

7. The aerobic granular sludge screening device according to claim 6, characterized in that: A floating ring (15) is sleeved on the outside of the rotating tube (11). The floating ring (15) is circumferentially fixed and axially elastically fitted with the rotating tube (11). A ring-shaped first magnetic element (1502) and a ring-shaped second magnetic element (1503) are fixedly provided on the inner wall of the floating ring (15) along the axis of the rotating tube (11). A magnet is fixedly embedded at one end of the limiting post (17) near the floating ring (15). The first magnetic element (1502) and the magnet are oppositely repelled by the same poles, and the second magnetic element (1503) and the magnet are oppositely attracted by the opposite poles.

8. The aerobic granular sludge screening device according to claim 7, characterized in that: A connecting rod (20) is provided above the filter screen (6). The connecting rod (20) is fixed relative to the filter screen (6). Multiple sets of square tubes (1501) are fixed on the outer peripheral wall of the floating ring (15). The top end of the connecting rod (20) passes through the square tube (1501) and slides with it. One end of the connecting rod (20) passes through the square tube (1501) and extends radially along the floating ring (15) to form a snap-fit ​​part (2001), so that the connecting rod (20) can drive the floating ring (15) to move downward synchronously.

9. An aerobic granular sludge screening device according to claim 5, characterized in that: The baffle ring (19) is fixedly connected to the housing (1).

10. An aerobic granular sludge screening device according to claim 2, characterized in that: Multiple sets of partitions (3) are fixedly installed inside the box (1). The internal space of the box (1) is divided into an anaerobic zone, an aerobic zone, an anoxic zone and a sedimentation zone (101) by the partitions (3). The return pipe (4) can draw the aerobic granular sludge above the filter screen (6) into the aerobic zone.

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