An activated sludge rotary screen

Abstract

The utility model discloses a kind of activated sludge rotary screeners, it is related to environmental management technical field, including central shaft, water distribution baffle, seven-character petal type water inlet pipe, screen cylinder, compressed air pipe, high-pressure backwash water pipe, backwash guide mud tank, driving mechanism, box, mud discharge passage and bottom support composition, the activated sludge rotary screener, by water distribution baffle, water flow is evenly spread on screen cylinder in the process of dewatering, increase the contact area of activated sludge and screen cylinder, the water part that is separated from screen body is contacted box after the flow guide structure between screen cylinder and box, will not drip back to activated sludge surface again, enhance dehydration effect;Under the action of box and collection mechanism, the water part that is separated from activated sludge can be collected, water resource recycling can be carried out, reduce cost, enhance the dehydration capacity of rotary screener, adopt compressed air auxiliary high-pressure water backwash screen body, save backflush water usage, improve screen body cleaning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of environmental governance technology, specifically to an activated sludge rotary screening machine. Background Technology

[0002] The activated sludge process is a commonly used biological wastewater treatment method in wastewater treatment plants. Activated sludge undergoes biochemical reactions in an aerobic aeration tank to remove organic pollutants from the water. The activated sludge and wastewater form a mixed liquid that flows to a secondary sedimentation tank. In the secondary sedimentation tank, the activated sludge separates from the wastewater and is then returned to the aeration tank to participate in the biochemical treatment. After this process, the specific gravity of the activated sludge is similar to that of water, resulting in a very slow gravity sedimentation rate. The suspended solids concentration in the effluent is less than 20 mg / L, influenced by the shape of the activated sludge. However, the separation efficiency of the activated sludge from the wastewater in the secondary sedimentation tank is very low due to gravity, and the process requires a large area. Therefore, a rotary screen for activated sludge has been proposed. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides an activated sludge rotary screening machine, which solves the problems mentioned in the background section.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an activated sludge rotary screener, comprising a central shaft, a water distribution baffle, a seven-petal-shaped inlet pipe, a screen cylinder, a compressed air pipe, a high-pressure backwash water pipe, a backwash sludge guide trough, a drive mechanism, a housing, a sludge discharge channel, and a bottom support. The screen cylinder includes a screen body, a support ring, a ring support, a screen support, a bushing, and a pin. The screen support is fixedly connected inside the housing. The housing includes a top cover front plate, a left side plate, and a box... The box comprises a right side panel, a rear side panel, a front side panel, and a rear top panel. A sieve cylinder is installed inside the box. The rear top panel is installed on the surface of the box. A left side panel and a right side panel are installed on the sides of the box. A collection trough is formed at the bottom of the box, and a water outlet is formed below the collection trough. A front top panel is fixedly connected to the front of the rear top panel, and a front side panel is fixedly connected to the bottom of the front top panel. A rear side panel is fixedly connected to one side of the box. The collar bracket is installed on the collection trough at the bottom of the box. The collar bracket is symmetrically installed along the screen cylinder. A supporting collar is rotatably connected inside the collar bracket. A reducer bracket is fixedly installed on the box. A drive motor and reducer body are installed on the reducer bracket. The output end of the drive motor is connected to the input shaft of the reducer body. The output shaft of the reducer body is fixedly connected to a central shaft. The water distribution baffles are all tightly fitted to the inner wall of the screen cylinder. A first water inlet pipe is fixedly connected to the inner side of the right side plate of the box. One end of the first water inlet pipe is fixedly connected to a seven-petal-shaped water inlet pipe. Several branch water inlet pipes are connected to the seven-petal-shaped water inlet pipe. A hollow shaft is movably sleeved on the outside of the central shaft. Several water distribution baffles are fixedly connected to the outside of the hollow shaft. The hollow shaft is movably sleeved on the outside of the central shaft. A screen support is sleeved on the outside of the central shaft. The outside of the screen support is in contact with the surface of the support ring. A screen cylinder is fixedly connected to one side of the screen body. The drive motor is connected to a bushing fixedly installed on one side of the screen cylinder through the central shaft. The central shaft and the bushing are connected by a pin, which passes through the central shaft and the bushing.

[0005] Preferably, the screen body is woven from stainless steel wire mesh and has a large number of micropores.

[0006] Preferably, the compressed air pipe includes a backwash pipe support. A compressed air pipe is installed inside the rear plate of the top cover and outside the screen cylinder. Several backwash pipe supports are fixedly connected to the outside of the compressed air pipe. Several small holes are opened on the outside of the compressed air pipe. The backwash pipe supports are all installed at the bottom of the rear plate of the top cover. A high-pressure backwash water pipe is fixedly connected to the backwash pipe support. Several small holes are opened on the outside of the high-pressure backwash water pipe.

[0007] Preferably, a backwash pipe bracket is fixedly connected to the top of the inner cavity of the rear panel of the top cover, and a high-pressure backwash water pipe is fixedly connected inside the backwash pipe bracket. A backwash pipe bracket is fixedly connected to the bottom of the rear panel of the top cover, and a compressed air pipe is fixedly connected inside the backwash pipe bracket. One end of both the compressed air pipe and the high-pressure backwash water pipe extends to the outside of the housing, and small holes are opened on the surface of both the compressed air pipe and the high-pressure backwash water pipe.

[0008] Preferably, a sludge discharge channel is fixedly connected to the inner side of the right side plate of the box, and a backwashing sludge guide groove is fixedly connected to one end of the sludge discharge channel. One end of the backwashing sludge guide groove is inserted into the screen support. A sludge guide bracket is fixedly connected to the bottom of the backwashing sludge guide groove. The bottom of the sludge guide bracket is fixedly connected to the outer side of the hollow shaft.

[0009] Preferably, a bottom support is fixedly connected to the bottom of the box.

[0010] This utility model provides an activated sludge rotary screening machine, which has the following beneficial effects: This rotary activated sludge screen uses a water distribution baffle to evenly distribute water across the screen cylinder during dewatering, increasing the contact area between the activated sludge and the screen cylinder. The guide structure between the screen cylinder and the housing ensures that water detached from the screen body does not drip back onto the activated sludge surface after contacting the housing, enhancing the dewatering effect. The housing and collection mechanism collect the water detached from the activated sludge, allowing for water recycling, reducing costs, and enhancing the dewatering capacity of the rotary screen. Compressed air-assisted high-pressure water backwashing of the screen body saves backwash water consumption and improves screen cleaning efficiency. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the internal structure of the box body of this utility model; Figure 2 This is a cross-sectional view of the internal structure of the sieve cylinder of this utility model; Figure 3 This is a side view of the structure of this utility model; Figure 4 This is a schematic diagram of the water distribution baffle structure of this utility model.

[0012] In the diagram: 1. Central shaft; 2. Water distribution baffle; 201. Hollow shaft; 3. Seven-petal-shaped water inlet pipe; 301. Sub-water inlet pipe; 302. First water inlet pipe; 4. Screen cylinder; 401. Screen body; 402. Support ring; 403. Ring bracket; 404. Screen bracket; 405. Shaft sleeve; 406. Pin; 5. Compressed air pipe; 501. Backwash pipe bracket; 6. High-pressure backwash water pipe; 7. Backwash sludge guide. 701. Sludge guide bracket; 702. Sludge discharge channel; 8. Drive mechanism; 801. Reducer bracket; 802. Drive motor; 803. Reducer body; 9. Housing; 901. Top cover front plate; 902. Housing left side plate; 903. Housing right side plate; 904. Collection trough; 905. Water outlet; 906. Housing rear side plate; 907. Housing front side plate; 908. Top cover rear plate; 10. Bottom bracket. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0014] Please see Figures 1 to 4This utility model provides a technical solution: an activated sludge rotary screener, comprising a central shaft 1, a water distribution baffle 2, a seven-petal-shaped water inlet pipe 3, a screen cylinder 4, a compressed air pipe 5, a high-pressure backwash water pipe 6, a backwash sludge guide trough 7, a drive mechanism 8, a housing 9, a sludge discharge channel 702, and a bottom support 10. The screen cylinder 4 includes a screen body 401, a support ring 402, a ring support 403, a screen support 404, a bushing 405, and a pin 406. The screen support 404 is fixedly connected inside the housing 9. The housing 9 includes a top cover front plate 901, a left side plate 902, and a right side plate. 903, rear side panel 906, front side panel 907, and rear top cover panel 908; a screen cylinder 4 is installed inside the tank 9; the rear top cover panel 908 is installed on the surface of the tank 9; a left side panel 902 and a right side panel 903 are installed on the side of the tank 9; a collection trough 904 is provided at the bottom of the tank 9; a water outlet 905 is provided below the collection trough 904; a front top cover panel 901 is fixedly connected to the front of the rear top cover panel 908; the front side panel 907 is fixedly connected to the bottom of the front top cover panel 901; and a rear side panel 906 is fixedly connected to one side of the tank 9. A collar bracket 403 is installed on the collection trough 904 at the bottom of the housing 9. The collar bracket 403 is symmetrically installed along the screen cylinder 4. A supporting collar 402 is rotatably connected inside the collar bracket 403. A reducer bracket 801 is fixedly installed on the housing 9. A drive motor 802 and a reducer body 803 are installed on the reducer bracket 801. The output end of the drive motor 802 is connected to the input shaft of the reducer body 803. The output shaft of the reducer body 803 is fixedly connected to a central shaft 1. The water distribution baffles 2 are all tightly fitted to the inner wall of the screen cylinder 4. A first water inlet pipe 302 is fixedly connected to the inner side of the right side plate 903 of the housing. A seven-petal-shaped water inlet pipe 3 is fixedly connected to one end of the first water inlet pipe 302. Several branch water inlet pipes 301 are connected to the seven-petal-shaped water inlet pipe 3. A hollow shaft 201 is movably sleeved on the outside of the central shaft 1. Several water distribution baffles 2 are fixedly connected to the outside of the hollow shaft 201. The hollow shaft 201 is movably sleeved on the outside of the central shaft 1. A screen support 404 is sleeved on the outside of the central shaft 1. The outside of the screen support 404 is in contact with the surface of the support ring 402. A screen cylinder 4 is fixedly connected to one side of the screen body 401. The drive motor 802 is connected to the bushing 405 fixedly installed on one side of the screen cylinder 4 through the central shaft 1. The central shaft 1 and the bushing 405 are connected by a pin 406, which passes through the central shaft 1 and the bushing 405.

[0015] The screen body 401 is woven from stainless steel wire mesh and has a large number of micropores.

[0016] The compressed air pipe 5 includes a backwash pipe bracket 501. The compressed air pipe 5 is installed inside the rear plate 908 of the top cover and outside the screen cylinder 4. Several backwash pipe brackets 501 are fixedly connected to the outside of the compressed air pipe 5. Several small holes are opened on the outside of the compressed air pipe 5. The backwash pipe brackets 501 are all installed at the bottom of the rear plate 908 of the top cover. A high-pressure backwash water pipe 6 is fixedly connected to the backwash pipe bracket 501. Several small holes are opened on the outside of the high-pressure backwash water pipe 6.

[0017] A backwash pipe bracket 501 is fixedly connected to the top of the inner cavity of the rear panel 908 of the top cover. A high-pressure backwash water pipe 6 is fixedly connected inside the backwash pipe bracket 501. A backwash pipe bracket 501 is fixedly connected to the bottom of the rear panel 908 of the top cover. A compressed air pipe 5 is fixedly connected inside the backwash pipe bracket 501. One end of both the compressed air pipe 5 and the high-pressure backwash water pipe 6 extends to the outside of the housing 9. Small holes are opened on the surface of both the compressed air pipe 5 and the high-pressure backwash water pipe 6.

[0018] A sludge discharge channel 702 is fixedly connected to the inner side of the right side plate 903 of the box body, and a backwashing sludge guide groove 7 is fixedly connected to one end of the sludge discharge channel 702. One end of the backwashing sludge guide groove 7 is inserted into the screen support 404. A sludge guide support 701 is fixedly connected to the bottom of the backwashing sludge guide groove 7. The bottom of the sludge guide support 701 is fixedly connected to the outer side of the hollow shaft 201.

[0019] The bottom of the housing 9 is fixedly connected to a bottom bracket 10.

[0020] In summary, when the activated sludge rotary screen is used, the activated sludge mixture is introduced into the rotary screen through the first inlet pipe 302 into the seven-petal-shaped inlet pipe 3 and the branch inlet pipe 301. Then, it is sprayed out through the branch inlet pipe 301 onto the surface of the water distribution baffle 2. The water distribution baffle 2 divides the screen body 401 into several parts. Except for the upper part, which is used for backwashing and sludge discharge and cannot be used for dewatering, the other parts of the screen body 401 can be dewatered simultaneously. Under the effect of dispersion, the activated sludge mixture flows into the screen body 401 more rapidly. Under the action of centrifugal force, the activated sludge mixture rotates and flows outward, hitting the water distribution baffle 2. Driven by the water flow energy, it flows along the water distribution baffle 2 towards its tail end. As the output end of the drive motor 802 drives the input shaft of the reducer body 803 to rotate, the output shaft of the reducer body 803 drives the central shaft 1 to rotate. This causes the central shaft 1 to drive the bushing 405 and the screen cylinder 4 to rotate through the pin 406, which in turn causes the screen cylinder 4 to drive the screen support 404. As the screen rotates, the activated sludge mixes and flows to the inside of the screen support 404. Water passes from the inside to the outside of the screen body 401, while the activated sludge is retained inside the screen body 401, achieving dewatering. Wastewater is separated through the filter holes on the screen body 401 and splashed onto the box 9 surrounding the screen cylinder 4. Water on the box 9 flows along the inner walls of the rear side plate 906 and the front side plate 907 of the box to the bottom of the box 9. The collection tank 904 collects the discharged water. Along the collection tank 904 from left to right, water flows from the bottom of the box 9... Water flows out of outlet 905. When the screen body 401 rotates to the top of the backwash sludge guide trough 7, the external air source inputs compressed air into the compressed air pipe 5 and sprays it out through the small holes on the surface of the compressed air pipe 5. The external water source inputs high-pressure water into the high-pressure backwash water pipe 6 and then sprays it out through the small holes on the surface of the high-pressure backwash water pipe 6 to wash the activated sludge adhering to the screen body 401. This allows the sludge and water to be guided into the sludge discharge channel 702 through the backwash sludge guide trough 7 and then discharged to the outside through the sludge discharge channel 702.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A rotary screen for activated sludge, characterized in that: The system comprises a central shaft (1), a water distribution baffle (2), a seven-petal-shaped water inlet pipe (3), a screen cylinder (4), a compressed air pipe (5), a high-pressure backwash water pipe (6), a backwash mud guide trough (7), a drive mechanism (8), a housing (9), a mud discharge channel (702), and a bottom support (10). The screen cylinder (4) includes a screen body (401), a support ring (402), a ring bracket (403), a screen bracket (404), a bushing (405), and a pin (406). The screen bracket (404) is fixedly connected inside the housing (9). The housing (9) includes a top cover front plate (901), a left side plate (902), a right side plate (903), a rear side plate (906), and a box. The box (9) has a front side panel (907) and a rear top cover panel (908). A sieve cylinder (4) is installed inside the box (9). The rear top cover panel (908) is installed on the surface of the box (9). The side of the box (9) has a left side panel (902) and a right side panel (903). A collection trough (904) is provided at the bottom of the box (9). A water outlet (905) is provided below the collection trough (904). A front top cover panel (901) is fixedly connected to the front of the rear top cover panel (908). A front side panel (907) is fixedly connected to the bottom of the front top cover panel (901). A rear side panel (906) is fixedly connected to one side of the box (9). The collar bracket (403) is installed on the collection groove (904) at the bottom of the box (9). The collar bracket (403) is symmetrically installed along the screen cylinder (4). The collar bracket (403) is rotatably connected to the inside of the collar bracket (402). A reducer bracket (801) is fixedly installed on the box (9). A drive motor (802) and a reducer body (803) are installed on the reducer bracket (801). The output end of the drive motor (802) is connected to the reducer body (803). The input shaft of the reducer body (803) is connected, and the output shaft of the reducer body (803) is fixedly connected to the central shaft (1). The water distribution baffles (2) are all tightly fitted to the inner wall of the screen cylinder (4). The inner side of the right side plate (903) of the box is fixedly connected to the first water inlet pipe (302). One end of the first water inlet pipe (302) is fixedly connected to the seven-petal-shaped water inlet pipe (3). Several branch water inlet pipes (301) are connected to the seven-petal-shaped water inlet pipe (3). A hollow shaft (201) is movably sleeved on the outside of the central shaft (1). Several water distribution baffles (2) are fixedly connected to the outside of the hollow shaft (201). The hollow shaft (201) is movably sleeved on the outside of the central shaft (1). A screen support (404) is sleeved on the outside of the central shaft (1). The outside of the screen support (404) is in contact with the surface of the support ring (402). A screen cylinder (4) is fixedly connected to one side of the screen body (401). The drive motor (802) is connected to the bushing (405) fixedly installed on one side of the screen cylinder (4) through the central shaft (1). The central shaft (1) and the bushing (405) are connected by a pin (406). The pin (406) passes through the central shaft (1) and the bushing (405).

2. The activated sludge rotary screening machine according to claim 1, characterized in that: The screen body (401) is woven from stainless steel wire mesh and has a large number of micropores.

3. The activated sludge rotary screening machine according to claim 1, characterized in that: The compressed air pipe (5) includes a backwash pipe bracket (501). The compressed air pipe (5) is installed inside the rear plate of the top cover (908) and outside the screen cylinder (4). Several backwash pipe brackets (501) are fixedly connected to the outside of the compressed air pipe (5). Several small holes are opened on the outside of the compressed air pipe (5). The backwash pipe brackets (501) are all installed at the bottom of the rear plate of the top cover (908). A high-pressure backwash water pipe (6) is fixedly connected to the backwash pipe bracket (501). Several small holes are opened on the outside of the high-pressure backwash water pipe (6).

4. The activated sludge rotary screen according to claim 1, characterized in that: A backwash pipe bracket (501) is fixedly connected to the top of the inner cavity of the rear plate of the top cover (908). A high-pressure backwash water pipe (6) is fixedly connected inside the backwash pipe bracket (501). A backwash pipe bracket (501) is fixedly connected to the bottom of the rear plate of the top cover (908). A compressed air pipe (5) is fixedly connected inside the backwash pipe bracket (501). One end of the compressed air pipe (5) and the high-pressure backwash water pipe (6) both extend to the outside of the box body (9). Small holes are opened on the surface of the compressed air pipe (5) and the high-pressure backwash water pipe (6).

5. The activated sludge rotary screen according to claim 1, characterized in that: A sludge discharge channel (702) is fixedly connected to the inner side of the right side plate (903) of the box body, and a backwashing sludge guide groove (7) is fixedly connected to one end of the sludge discharge channel (702). One end of the backwashing sludge guide groove (7) is inserted into the screen support (404). A sludge guide support (701) is fixedly connected to the bottom of the backwashing sludge guide groove (7). The bottom of the sludge guide support (701) is fixedly connected to the outer side of the hollow shaft (201).

6. The activated sludge rotary screen according to claim 1, characterized in that: The bottom of the box (9) is fixedly connected to a bottom bracket (10).

Images