Prefabricated unit combined sewage treatment system

Abstract

This application relates to a prefabricated unit-combined sewage treatment system, belonging to the field of sewage treatment technology. It includes a prefabricated tank, which is a rectangular tank with an open top. Connectors are provided on the outer wall of the tank for connecting adjacent tanks during assembly. An installation frame is slidably disposed within the tank, with its outer frame abutting against the inner wall of the tank. Multiple discharge plates are disposed within the installation frame, lying flat and enclosing it. The discharge plates are rotatably disposed within the installation frame, with their rotation axis parallel to the bottom wall of the tank. A first driving component is also included to drive the discharge plates to rotate, leaving space between adjacent discharge plates for sludge to fall. The installation frame is slidably disposed within the tank, sliding along the depth direction of the tank. A second driving component is also included to drive the sliding of the installation frame. This application has the effect of shortening the construction time of the sewage treatment system.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a prefabricated unit-combined wastewater treatment system. Background Technology

[0002] Currently, MBR (Membranous Bioreactor) systems are widely used in wastewater treatment due to their high efficiency in biodegradation and membrane filtration. A typical wastewater treatment system includes an equalization tank, an MBR system, a sedimentation tank, and a sludge tank. The equalization tank includes a mixer and a booster pump to regulate water quality and quantity. The MBR system includes a backwash valve, a permeate valve, a nitrification liquor return pump, and membrane modules. The backwash valve is used to periodically backwash the membrane modules, and the nitrification liquor return pump returns the nitrified liquor from the aerobic zone to the anoxic zone. The sedimentation tank includes a mixer and a return pump for further sedimentation and sludge separation. The sludge tank is used for final sedimentation and discharge of clean water.

[0003] However, while the traditional distributed multi-unit combination process has clear unit functions, it occupies a large area and requires a lot of time to build the functional pools when constructing on-site. Summary of the Invention

[0004] To shorten the construction time of a wastewater treatment system, this application provides a prefabricated unit-combined wastewater treatment system.

[0005] The prefabricated unit-combined sewage treatment system provided in this application adopts the following technical solution:

[0006] A prefabricated unit-combined sewage treatment system includes a prefabricated tank body, which is a rectangular tank body with an open top. The outer wall of the tank body is provided with connectors for connecting adjacent tank bodies during assembly. An installation frame is slidably disposed within the tank body, with its outer frame abutting against the inner wall of the tank body. Multiple discharge plates are disposed within the installation frame, lying flat and enclosing the frame. The discharge plates are rotatably disposed within the installation frame, with their rotation axis parallel to the bottom wall of the tank body. The system also includes a first driving component for driving the discharge plates to rotate, leaving space between adjacent discharge plates for sludge to fall. The installation frame is slidably disposed within the tank body, sliding along the depth direction of the tank body. The system also includes a second driving component for driving the installation frame to slide.

[0007] Optionally, the first driving component includes a first motor disposed within the mounting frame. There are two first motors, each located on a side wall opposite to the mounting frame. The rotating shaft of the feeding plate is located within the mounting frame, and the side wall of the mounting frame is hollow. The first driving component also includes a driving belt disposed within the mounting frame. The rotating shaft of the feeding plate is wound within the driving belt. Multiple locking rods are disposed on the inner side of the driving belt. The rotating shaft of the feeding plate is provided with locking grooves for the locking rods to engage.

[0008] Optionally, a drive wheel is provided on the rotating shaft of the feeding plate, the snap-fit ​​groove is opened on the drive wheel, the drive belt is wound around the drive wheel, and the drive belts on both sides are wound around the spaced drive wheels so that the rotation directions of adjacent feeding plates are opposite.

[0009] Optionally, a water pump is installed on the mounting frame, and a return water pipe is installed on the side wall of the pool. The return water pipe is an accordion pipe, with its inlet located in the upper part of the pool so that the upper clear liquid enters into the inlet. The return water pipe is located at the inlet of the water pump, and the outlet of the water pump enters the mounting frame. The discharge plate and the discharge plate rotating shaft are both hollow. The rotating shaft of the discharge plate is connected to the mounting frame. Multiple water outlet holes are opened on the discharge plate to drive the sludge deposited on the discharge plate to float above the discharge plate.

[0010] Optionally, the side wall of the pool is rotatably provided with an installation plate, the rotation axis of the installation plate is parallel to the bottom wall of the pool, a sludge pump is provided on the installation plate, the sludge pump is located on the plate surface facing the side wall of the pool, and when the installation plate covers the side wall of the pool, the back of the installation plate is flush with the side wall of the pool.

[0011] Optionally, the second driving component includes a winch disposed at the top of the pool body and a wire rope wound on the winch, the free end of which is fixedly disposed at the top of the mounting frame.

[0012] Optionally, a central shaft is provided at the center of the bottom of the pool, and a stirring plate is provided on the central shaft. The central shaft is perpendicular to the bottom of the pool and is rotatably mounted on the bottom wall of the pool. A waterproof motor for driving the rotation of the central shaft is provided at the bottom of the pool. The central shaft passes through an adjacent discharge plate to the upper part of the pool. The discharge plate corresponding to the central shaft has a notch for the central shaft to pass through.

[0013] Optionally, the stirring plate is hollow and has a feeding notch on its side. The interior of the stirring plate is connected to the central shaft. The central shaft is hollow and has a spiral conveying shaft rotatably mounted inside it. A second motor is mounted on the top of the central shaft, and the spiral conveying shaft is mounted on the output shaft of the second motor. The central shaft has multiple discharge holes, and the sludge inside the central shaft is discharged through the discharge holes.

[0014] Optionally, the mixing plate is provided with multiple movable plates, which are evenly arranged along the length of the mixing plate. Adjacent movable plates are formed into a sludge tank. The movable plates are movably disposed within the movable plates. The mixing plate is provided with a third driving component for driving the movable plates to carry the sludge into the central shaft.

[0015] Optionally, the third driving component includes a third motor, a conveyor belt, and a conveyor wheel. The top of the mixing plate has an installation notch. The conveyor wheel is rotatably disposed within the installation notch. The conveyor belt is wound onto the conveyor wheel. The second motor is used to drive the conveyor wheel to rotate. The movable plate is fixedly disposed on the conveyor belt and moves onto the mixing plate through the installation notch.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. When constructing a sewage treatment system, the ground is first leveled and hardened, and then the tanks are hoisted. According to the design drawings of the sewage treatment system, such as a long strip, rectangular, or radiating layout, the tanks are hoisted to the design position. Then, adjacent tanks are connected with connectors to complete the construction of the sewage treatment system tanks. Subsequently, the sewage treatment-related components are installed in the tanks, thereby reducing the construction time of the sewage treatment system.

[0018] 2. When used as a sludge tank, equalization tank, bacterial reaction tank, or sludge recycling tank, it is necessary to homogenize the sludge and water within the tank to ensure a more uniform distribution of sludge per unit volume of wastewater. In this case, the second driving component drives the mounting frame to slide. As the mounting frame slides, the first driving component drives the discharge plate to rotate. This rotation creates gaps between adjacent discharge plates, allowing the sludge on the discharge plates to fall through these gaps. This results in a more even distribution of the sludge deposited at the bottom of the tank, improving wastewater treatment efficiency. Simultaneously, adjusting the gap between adjacent discharge plates regulates the sludge's falling speed, further ensuring a more uniform distribution of sludge within the tank. Attached Figure Description

[0019] Figure 1 This is an assembly schematic diagram of a prefabricated unit combination sewage treatment system according to an embodiment of this application;

[0020] Figure 2 This is a schematic diagram of the tank structure in a prefabricated unit combined sewage treatment system according to an embodiment of this application;

[0021] Figure 3 This is a cross-sectional view of the mounting frame in a prefabricated unit combined sewage treatment system according to an embodiment of this application;

[0022] Figure 4 yes Figure 3 An enlarged schematic diagram of part A in the middle;

[0023] Figure 5 This is a schematic diagram of the central shaft in a prefabricated unit combined sewage treatment system according to an embodiment of this application;

[0024] Figure 6This is a cross-sectional view of the central axis of a prefabricated unit combined sewage treatment system according to an embodiment of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Pool body; 2. Mounting frame; 3. Discharge plate;

[0026] 4. First driving component; 41. First motor; 42. Drive belt; 43. Drive wheel;

[0027] 5. Second drive component; 51. Winch; 52. Wire rope;

[0028] 6. Connecting rod; 7. Connecting groove; 8. Water pump; 9. Return water pipe; 10. Water outlet; 11. Central shaft; 12. Mixing plate; 13. Feed notch; 14. Screw conveyor shaft; 15. Second motor; 16. Discharge hole; 17. Moving plate; 18. Third motor; 19. Conveyor belt; 20. Conveyor wheel; 21. Mounting plate; 22. Sludge pump; 23. Sludge pipe. Detailed Implementation

[0029] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0030] This application discloses a prefabricated, modular wastewater treatment system. (Refer to...) Figure 1 The prefabricated unit combined sewage treatment system includes a prefabricated tank body 1, which is a rectangular tank body 1 with an open top. The outer wall of the tank body 1 is provided with connectors, which are used to connect adjacent tank bodies 1 during assembly. The connectors include connecting plates provided on the side walls of the tank body 1 and connecting grooves opened on the side walls of the tank body 1. Furthermore, the connecting plates and connecting grooves are located on opposite side walls, and the connecting plates are provided on two adjacent side walls of the tank body 1. Furthermore, the connecting plates are dovetail blocks or T-shaped to facilitate stable connection of adjacent tank bodies 1.

[0031] Reference Figure 2 and Figure 3 To facilitate more uniform mixing of wastewater entering the tank 1 and uniform mixing of reacting sludge within the wastewater, an installation frame 2 is slidably installed inside the tank 1. The outer frame of the installation frame 2 abuts against the inner wall of the tank 1. Multiple discharge plates 3 are installed inside the installation frame 2, which are laid flat and enclose the installation frame 2. The discharge plates 3 are rotatably installed inside the installation frame 2, with their rotation axis parallel to the bottom wall of the tank 1. A first driving component 4 is also included to drive the discharge plates 3 to rotate, leaving space between adjacent discharge plates 3 for sludge to fall. The installation frame 2 is slidably installed inside the tank 1, sliding along the depth direction of the tank 1. A second driving component 5 is also included to drive the installation frame 2 to slide.

[0032] The second driving component 5 drives the mounting frame 2 to slide. When the mounting frame 2 slides, the first driving component 4 drives the discharge plate 3 to rotate. The rotation of the discharge plate 3 creates a gap between adjacent discharge plates 3, allowing the sludge on the discharge plate 3 to fall through the gap. This distributes the sludge deposited at the bottom of the tank 1 more evenly within the tank 1, thus improving the wastewater treatment effect. At the same time, by adjusting the size of the gap between adjacent discharge plates 3, the falling speed of the sludge is adjusted, further ensuring that the sludge is evenly distributed within the tank 1.

[0033] Reference Figure 2 In this embodiment of the application, the second driving component 5 includes a winch 51 disposed on the top of the pool body 1 and a wire rope 52 wound on the winch 51, with the free end of the wire rope 52 fixedly disposed on the top of the mounting frame 2.

[0034] Reference Figure 3 and Figure 4 In this embodiment, the first driving component 4 includes a first motor 41 disposed within the mounting frame 2. The length direction of the output shaft of the first motor 41 is parallel to the length direction of the feeding plate 3. There are two first motors 41, which are respectively located on the side walls opposite to each other in the mounting frame 2. The rotation shaft of the feeding plate 3 is located within the mounting frame 2, and the side walls of the mounting frame 2 are hollow. The first driving component 4 also includes a driving belt 42 disposed within the mounting frame 2. The rotation shaft of the feeding plate 3 is wound within the driving belt 42, and the first motor 41 drives the rotation shaft of any one of the feeding plates 3 to rotate.

[0035] After the sludge carrying bacteria settles in the tank 1, the winch 51 is started first. The winch 51 winds up the wire rope 52, which in turn moves the mounting frame 2 within the tank 1. At the same time, the first motor 41 is started, which drives the discharge plate 3 to rotate. The rotation of the discharge plate 3 drives the drive belt 42 to run, which in turn drives the other discharge plates 3 to rotate, thus opening the gap between adjacent discharge plates 3. This facilitates the sludge settling and ensures that the sludge is evenly distributed within the tank 1.

[0036] Reference Figure 3 and Figure 4 To facilitate the rotation of the discharge plate 3 by the drive belt 42, multiple locking rods 6 are provided on the inner side of the drive belt 42, and locking grooves 7 are provided on the rotating shaft of the discharge plate 3 for the locking rods 6 to engage. When the drive belt 42 drives the discharge plate 3 to rotate, the locking rods 6 engage in the locking grooves 7, which facilitates the rotation of the rotating shaft under the drive of the drive belt 42. Furthermore, under the action of the locking rods 6 and the locking grooves 7, it is easy to fix the discharge plate 3 in a horizontal or inclined state, which facilitates the deposition of sludge and the quantitative falling of sludge.

[0037] Reference Figure 3 and Figure 4Furthermore, a drive wheel 43 is provided on the rotating shaft of the discharge plate 3, a snap-fit ​​groove 7 is opened on the drive wheel 43, and a drive belt 42 is wound around the drive wheel 43. The drive belts 42 on both sides are wound around the spaced drive wheels 43 so that the rotation directions of adjacent discharge plates 3 are opposite. The opposite rotation directions of adjacent discharge plates 3 make it easier for adjacent discharge plates 3 to form an inverted V-shaped funnel after rotation, which facilitates the sludge to fall.

[0038] Reference Figure 2 , Figure 3 and Figure 4 To facilitate the initial rotation of the discharge plate 3 after the sludge is deposited and pressed onto it, in this embodiment, a water pump 8 is installed on the mounting frame 2, and a return water pipe 9 is installed on the side wall of the tank body 1. The return water pipe 9 is a bellows pipe, and its inlet end is located in the upper part of the tank body 1 so that the upper clear liquid enters into the inlet end. The return water pipe 9 is located at the inlet end of the water pump 8, and the outlet end of the water pump 8 enters the mounting frame 2. Both the discharge plate 3 and the rotating shaft of the discharge plate 3 are hollow, and the rotating shaft of the discharge plate 3 is connected to... The mounting frame 2 is connected, and the discharge plate 3 has multiple water outlet holes 10, which causes the sludge deposited on the discharge plate 3 to float above the discharge plate 3. When the discharge plate 3 needs to be rotated, the water pump 8 is started. The water pump 8 draws the upper layer of clear liquid in the tank 1 into the return water pipe 9. The clear liquid enters the mounting frame 2 and enters the discharge plate 3 through the rotating shaft. It is then sprayed out from the water outlet holes 10 and acts on the sludge, causing the sludge to float above the discharge plate 3, thus facilitating the rotation of the discharge plate 3 for sludge discharge.

[0039] Reference Figure 2 , Figure 5 and Figure 6 When the sludge is discharged through the discharge plate 3 and the mounting frame 2 initially rises, the sludge concentration is relatively high, causing the falling sludge to settle at the bottom of the tank 1. Therefore, in this embodiment, a central shaft 11 is provided in the middle of the bottom of the tank 1, and a stirring plate 12 is provided on the central shaft 11. The central shaft 11 is perpendicular to the bottom of the tank 1 and rotatably mounted on the bottom wall of the tank 1. A waterproof motor for driving the rotation of the central shaft 11 is provided at the bottom of the tank 1. The central shaft 11 passes through the adjacent discharge plate 3 to the upper part of the tank 1, and the discharge plate 3 corresponding to the central shaft 11 has a notch for the central shaft 11 to pass through. When the mounting frame 2 moves upward, the waterproof motor is first started, and the waterproof motor drives the central shaft 11 to rotate. The rotation of the central shaft 11 drives the stirring plate 12 to rotate. The rotation of the stirring plate 12 scrapes the sludge deposited on it, causing the deposited sludge to float back to the water, making it easier for bacteria to attach to the sludge and treat the sewage.

[0040] Reference Figure 5 and Figure 6Furthermore, the mixing plate 12 is hollow and has a feeding notch 13 on its side. The feeding notch 13 is located on the side wall of the mixing plate 12 in the direction of rotation. The interior of the mixing plate 12 is connected to the central shaft 11, which is hollow. A screw conveyor shaft 14 is rotatably installed inside the central shaft 11. A second motor 15 is installed at the top of the central shaft 11, and the screw conveyor shaft 14 is installed on the output shaft of the second motor 15. The central shaft 11 has multiple discharge holes 16, through which the sludge inside the central shaft 11 is discharged. When the waterproof motor drives the central shaft 11 to rotate, the rotation of the central shaft 11 drives the mixing plate 12 to rotate. The rotation of the mixing plate 12 scrapes the sludge, causing it to enter the mixing plate 12. Then, the second motor 15 is started, and the second motor 15 drives the screw conveyor shaft 14 to rotate. The screw conveyor shaft 14 conveys the sludge and removes it through the discharge holes 16, further improving the sludge distribution effect and thus improving the wastewater treatment effect.

[0041] Reference Figure 5 and Figure 6 When the sludge enters the mixing plate 12, it enters the central shaft 11 to facilitate the movement of the sludge within the mixing plate 12. Multiple movable plates 17 are provided inside the mixing plate 12. The movable plates 17 are evenly arranged along the length of the mixing plate 12, and a sludge trough is formed between adjacent movable plates 17. The movable plates 17 are movably disposed within the movable plates 17. A third driving component is provided on the mixing plate 12 to drive the movable plates 17 and drive the sludge into the central shaft 11.

[0042] Reference Figure 5 and Figure 6 The third driving component includes a third motor 18, a conveyor belt 19 and a conveyor wheel 20. The top of the mixing plate 12 is provided with an installation notch. The conveyor wheel 20 is rotatably installed in the installation notch. The conveyor belt 19 is wound on the conveyor wheel 20. The second motor 15 is used to drive the conveyor wheel 20 to rotate. The moving plate 17 is fixedly installed on the conveyor belt 19 and runs to the mixing plate 12 through the installation notch.

[0043] When the sludge enters the mixing plate 12, the second motor 15 is started. The second motor 15 drives the conveyor wheel 20 to rotate. The rotation of the conveyor wheel 20 drives the conveyor belt 19 to run. The running of the conveyor belt 19 drives the moving plate 17 to move. The moving plate 17 pushes the sludge to move, so that the sludge enters the central shaft 11, thereby facilitating the transport of the lower layer of sludge to the upper layer of the tank body 1, further improving the sewage treatment effect.

[0044] Reference Figure 2After the wastewater is reacted, it is transported to the next tank 1. To facilitate the removal of sludge, a mounting plate 21 is rotatably installed on the side wall of tank 1. The rotation axis of the mounting plate 21 is parallel to the bottom wall of tank 1. A sludge pump 22 is installed on the mounting plate 21, with the sludge pump 22 located on the side of the mounting plate 21 facing the side wall of tank 1. When the mounting plate 21 covers the side wall of tank 1, the back of the mounting plate 21 is flush with the side wall of tank 1. When it is necessary to remove sludge from tank 1, the mounting plate 21 is rotated first. The mounting plate 21 drives the sludge pump 22 into the middle or lower part of tank 1, thereby facilitating the removal of sludge from tank 1.

[0045] Reference Figure 2 Furthermore, the sludge pipe 23 is a flexible hose and is fixed in the middle to the inner wall of the tank body 1. The sludge pipe 23 is mounted on the sludge pump 22. At the same time, a rotating motor for rotating the mounting plate 21 is provided on the side wall of the tank body 1.

[0046] The implementation principle of a prefabricated unit-combined sewage treatment system according to an embodiment of this application is as follows:

[0047] When constructing a sewage treatment system, the ground is first leveled and hardened. Then, the tank 1 is hoisted to the design position according to the sewage treatment system design drawings, such as a long strip, a rectangular arrangement, or a radiating arrangement. Next, adjacent tanks 1 are connected with connectors to complete the construction of the sewage treatment system tank 1. Then, the sewage treatment-related components are installed in the tank 1, thereby reducing the construction time of the sewage treatment system.

[0048] When used as a sludge tank, equalization tank, bacterial reaction tank, and sludge recycling tank, it is necessary to homogenize the sludge and water in the tank 1 to ensure that the sludge in a unit volume of sewage is relatively uniform. At this time, the second driving component 5 drives the mounting frame 2 to slide. When the mounting frame 2 slides, the first driving component 4 drives the discharge plate 3 to rotate. The rotation of the discharge plate 3 leaves a gap between adjacent discharge plates 3, so that the sludge on the discharge plate 3 falls through the gap, and the sludge deposited at the bottom of the tank 1 is more evenly distributed in the tank 1, thereby improving the sewage treatment effect. At the same time, by adjusting the size of the gap between adjacent discharge plates 3, the falling speed of the sludge is adjusted, further making the sludge evenly distributed in the tank 1.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A prefabricated unit-based wastewater treatment system, characterized in that: The system includes a prefabricated pool body (1), which is a rectangular pool body (1) with an open top. The outer wall of the pool body (1) is provided with connectors for connecting adjacent pool bodies (1) during assembly. An installation frame (2) is slidably installed inside the pool body (1). The outer frame of the installation frame (2) abuts against the inner wall of the pool body (1). Multiple material feeding plates (3) are installed inside the installation frame (2). The material feeding plates (3) are laid flat inside the installation frame (2) and enclose it. The material feeding plates (3) are rotatably installed inside the installation frame (2), and their rotation axis is parallel to the bottom wall of the pool body (1). A first driving component (4) is used to drive the discharge plate (3) to rotate, thereby leaving a gap between adjacent discharge plates (3) for sludge to fall; the mounting frame (2) slides along the depth direction of the tank body (1), and also includes a second driving component (5) for driving the mounting frame (2) to slide; the first driving component (4) includes a first motor (41) disposed in the mounting frame (2), two first motors (41) are provided and are respectively located on the side walls opposite to each other of the mounting frame (2), the rotation shaft of the discharge plate (3) is located in the mounting frame (2), and the side wall of the mounting frame (2) is hollow; the first driving component (4) also includes a driving belt disposed in the mounting frame (2). (42), the rotating shaft of the feeding plate (3) is wound inside the drive belt (42), and multiple snap-fit ​​rods (6) are provided on the inner side of the drive belt (42). The rotating shaft of the feeding plate (3) is provided with snap-fit ​​grooves (7) for snap-fit ​​rods (6) to snap-fit. A water pump (8) is provided on the mounting frame (2). A return water pipe (9) is provided on the side wall of the pool body (1). The return water pipe (9) is a bellows pipe. The water inlet of the return water pipe (9) is located in the upper part of the pool body (1) so that the upper clear liquid enters into the water inlet. The return water pipe (9) is located at the water inlet of the water pump (8). The water outlet of the water pump (8) enters the mounting frame (2). The feeding plate ( 3) Both the rotating shaft of the discharge plate (3) and the rotating shaft of the discharge plate (3) are hollow. The rotating shaft of the discharge plate (3) is connected to the mounting frame (2). Multiple water outlet holes (10) are opened above the discharge plate (3) to drive the sludge deposited on the discharge plate (3) to float above the discharge plate (3). When the discharge plate (3) needs to be rotated, the water pump (8) is started. The water pump (8) draws the upper layer of clear liquid in the pool (1) into the return water pipe (9). The clear liquid enters the mounting frame (2) and enters the discharge plate (3) through the rotating shaft. Then it is sprayed out from the water outlet hole (10) and acts on the sludge, so that the sludge floats above the discharge plate (3), which facilitates the rotation of the discharge plate (3) to discharge the sludge.

2. The prefabricated unit-combined sewage treatment system according to claim 1, characterized in that: The feeding plate (3) is provided with a drive wheel (43) on its rotating shaft. The snap-fit ​​groove (7) is opened on the drive wheel (43). The drive belt (42) is wound around the drive wheel (43). The drive belts (42) on both sides are wound around the spaced drive wheels (43) so that the rotation directions of adjacent feeding plates (3) are opposite.

3. The prefabricated unit-combined sewage treatment system according to claim 1, characterized in that: The side wall of the pool body (1) is rotatably provided with an installation plate (21), the rotation axis of the installation plate (21) is parallel to the bottom wall of the pool body (1), a sludge pump (22) is provided on the installation plate (21), the sludge pump (22) is located on the plate surface of the installation plate (21) facing the side wall of the pool body (1), when the installation plate (21) covers the side wall of the pool body (1), the back of the installation plate (21) is flush with the side wall of the pool body (1).

4. The prefabricated unit-combined sewage treatment system according to claim 1, characterized in that: The second drive unit (5) includes a winch (51) disposed on the top of the pool body (1) and a wire rope (52) wound on the winch (51), the free end of which is fixedly disposed on the top of the mounting frame (2).

5. The prefabricated unit-combined sewage treatment system according to claim 1, characterized in that: A central shaft (11) is provided at the bottom center of the pool body (1), and a stirring plate (12) is provided on the central shaft (11). The central shaft (11) is perpendicular to the bottom of the pool body (1) and is rotatably mounted on the bottom wall of the pool body (1). A waterproof motor for driving the central shaft (11) to rotate is provided at the bottom of the pool body (1). The central shaft (11) passes through the adjacent discharge plate (3) to the upper part of the pool body (1). The discharge plate (3) corresponding to the central shaft (11) has a notch for the central shaft (11) to pass through.

6. A prefabricated unit-combined sewage treatment system according to claim 5, characterized in that: The stirring plate (12) is hollow and has a feeding notch (13) on its side. The interior of the stirring plate (12) is connected to the central shaft (11). The central shaft (11) is hollow and has a spiral conveying shaft (14) rotatably mounted inside it. A second motor (15) is mounted on the top of the central shaft (11), and the spiral conveying shaft (14) is mounted on the output shaft of the second motor (15). The central shaft (11) has multiple discharge holes (16), through which the sludge inside the central shaft (11) is discharged.

7. A prefabricated unit-combined sewage treatment system according to claim 6, characterized in that: The stirring plate (12) is provided with a plurality of movable plates (17), which are evenly arranged along the length of the stirring plate (12). Adjacent movable plates (17) are formed into a sludge tank. The movable plates (17) are movably disposed in the stirring plate (12). The stirring plate (12) is provided with a third driving component for driving the movable plates (17) to drive the sludge into the central shaft (11).

8. A prefabricated unit-combined sewage treatment system according to claim 7, characterized in that: The third driving component includes a third motor (18), a conveyor belt (19), and a conveyor wheel (20). The top of the stirring plate (12) is provided with an installation notch. The conveyor wheel (20) is rotatably disposed in the installation notch. The conveyor belt (19) is wound onto the conveyor wheel (20). The third motor (18) is used to drive the conveyor wheel (20) to rotate. The moving plate (17) is fixedly disposed on the conveyor belt (19) and moves to the stirring plate (12) through the installation notch.

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