Anaerobic tank sludge discharge device and sludge discharge method for sewage treatment

Abstract

The application discloses an anaerobic tank sludge discharge device and sludge discharge method for sewage treatment, and belongs to the technical field of sewage treatment, which comprises a scraping strip and a driving unit, the driving unit is used for driving the scraping strip to move, the driving unit comprises a rotating seat and a driving part, a rotating electromagnet is fixedly installed on the rotating seat, and the output end of the rotating electromagnet is fixedly connected with the scraping strip; the driving part is in transmission connection with the rotating seat, can drive the rotating seat to make a circular motion around the center axis of the anaerobic tank, and further drives the scraping strip to make a circular sludge scraping motion along the radial direction of the anaerobic tank. The anaerobic tank sludge discharge device and sludge discharge method for sewage treatment separate the cleaning load of the peripheral and central regions by adopting the Z-shaped scraping strip structure, avoid the problem of resistance concentration caused by the excessively large linear speed of the peripheral of the traditional linear scraping strip, improve the fatigue resistance of the scraping strip, and solve the problem of incomplete cleaning of a single working surface.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a sludge removal device and method for anaerobic tanks used in wastewater treatment. Background Technology

[0002] In wastewater treatment, the anaerobic digester is a crucial component. The sludge in the anaerobic digester needs to be cleaned regularly to ensure treatment effectiveness and operational efficiency. Currently, the common method for sludge removal from anaerobic digesters is to use radially rotating scrapers. However, this method has some problems in practical applications.

[0003] Traditional scrapers, such as the sedimentation tank scraper disclosed in patent publication CN219744023U, exhibit increased linear velocity and resistance closer to the outer perimeter of the anaerobic tank as they rotate radially. This results in excessively high loads on the scraper's ends during operation, leading to a sudden increase in shear resistance and contact pressure from the sludge in the outer area, making the scraper ends prone to deformation or breakage. This easily damages the scraper, increasing equipment maintenance costs and downtime.

[0004] Furthermore, this single-face scraping cleaning method is not ideal for cleaning anaerobic ponds. Due to the differences in sludge characteristics and distribution in different areas, scraping from a single face is insufficient for a comprehensive and effective cleaning of the entire anaerobic pond, potentially leading to incomplete sludge removal in some areas and affecting the treatment efficiency of the anaerobic pond.

[0005] To address these issues, we propose a sludge removal device and method for anaerobic ponds used in wastewater treatment. Summary of the Invention

[0006] The purpose of this invention is to solve the problems of easy damage and poor cleaning effect of anaerobic pond sludge removal devices in the prior art, and to propose an anaerobic pond sludge removal device and sludge removal method for sewage treatment.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A sludge removal device for an anaerobic tank in wastewater treatment includes a scraper and a drive unit. The drive unit is used to drive the scraper to move. The drive unit includes a rotating base and a drive component. A rotating electromagnet is fixedly installed on the rotating base, and the output end of the rotating electromagnet is fixedly connected to the scraper. The drive component is driven to the rotating base and can drive the rotating base to make a circular motion around the central axis of the anaerobic tank, thereby driving the scraper to make a circular sludge scraping motion along the radial direction of the anaerobic tank.

[0009] The scraper includes a first scraper section, a connecting section and a second scraper section arranged sequentially along the length direction. The connecting section is inclined relative to the horizontal plane, so that the first scraper section and the second scraper section are bent and connected to form two working surfaces with one high and one low.

[0010] When the rotating electromagnet is energized, it can drive the scraper to rotate, thereby changing the interaction position between the first and second scraper sections and the inner wall of the anaerobic tank.

[0011] Preferably, the rotating electromagnet is mounted above the scraper bar via a bracket and is fixedly connected to the connecting section via a vertically arranged fixed shaft. When the rotating electromagnet is energized, it can drive the scraper bar to rotate 180° around the vertical axis, thereby exchanging the circumferential positions of the first scraper section and the second scraper section.

[0012] Preferably, the output end of the rotating electromagnet is fixedly connected to a horizontal shaft, and the other end of the horizontal shaft is fixedly connected to the end face of the scraper. When the rotating electromagnet is energized, it can drive the scraper to rotate 180° around the horizontal shaft, so that the high and low working surfaces of the first and second scraper sections are interchanged.

[0013] Preferably, the drive unit and the rotating seat are connected by a telescopic cylinder. The cylinder body of the telescopic cylinder is connected to the output end of the drive unit, and the piston rod is fixed to the bottom of the rotating seat, which can drive the scraper to rise and fall along the central axis of the anaerobic tank.

[0014] Preferably, the cross-section of the scraper is quadrilateral, including an upper working surface and a lower working surface arranged in parallel, and a side working surface that is inclinedly connected to both.

[0015] Preferably, the cross-section of the scraper is a parallelogram, and the upper working surface and the lower working surface are of equal width and parallel.

[0016] Preferably, the cross-section of the scraper is an isosceles trapezoid, and the width of the upper working surface is smaller than the width of the lower working surface.

[0017] Preferably, the lower working surface is provided with a thickened portion at the edge near the side working surface.

[0018] This invention also claims a sludge removal method for wastewater treatment, employing the aforementioned anaerobic tank sludge removal device for wastewater treatment, comprising the following steps:

[0019] S1. Initial position setting: Adjust the scraper by rotating the electromagnet so that the low working surface of the first scraper section contacts the central area of ​​the anaerobic tank and the high working surface of the second scraper section contacts the outer area.

[0020] S2. First cleaning: Start the drive unit to drive the scraper to make a circular motion at a speed of 1-5 rpm, and use the high working surface to perform the initial cleaning of the outer area to remove loose sludge from the surface;

[0021] S3. Working condition switching: The rotating electromagnet drives the scraper to rotate 180°, so that the high working surface of the first scraper section contacts the central area, and the low working surface of the second scraper section contacts the outer area.

[0022] S4. Secondary cleaning: Keep the drive unit running and use the low working surface to thoroughly remove the hard sludge remaining in the outer area;

[0023] S5. Depth Adjustment: If it is necessary to treat the mud and scale attached to the pool wall, adjust the height of the scraper so that the scraper acts on the pool wall to perform cleaning.

[0024] Preferably, a refinement step is added after step S5:

[0025] The control electromagnet drives the scraper to rotate slowly around the vertical axis at a speed of 0.3-0.5 rpm, so that the two parts of the scraper simultaneously contact the center and outer transition area of ​​the pool bottom. The cleaning of mud residue is completed by continuous low-speed rotation for 40-60 seconds.

[0026] In summary, the technical effects and advantages of this invention are as follows: The sludge removal device and method for anaerobic tanks in wastewater treatment adopts a Z-shaped scraper structure, which separates the cleaning load of the outer and central areas, avoiding the resistance concentration problem caused by excessive linear velocity of the outer periphery in traditional straight scrapers, improving the fatigue resistance of the scraper, and solving the problem of incomplete cleaning of a single working surface.

[0027] Two scraper bar position adjustment methods were designed. The first method involves rotation around a vertical axis at the center of the scraper bar, which not only adjusts the scraper bar position but also allows for its rotation and revolution, achieving a refined cleaning effect. The second method involves rotation around a horizontal axis at the end of the scraper bar, combined with a telescopic cylinder for lifting and lowering. This allows for cleaning of the tank walls using the scraper bar end and also enables switching of operating conditions as needed, accelerating the cleaning process when the sludge layer is shallow. By interchangeing the circumferential position around the vertical axis and switching between high and low working surfaces around the horizontal axis, the system can better adapt to the sludge characteristics of different areas, improving the overall cleaning effect of the anaerobic tank.

[0028] The scraper blade has a cross-section designed as an isosceles trapezoid and a parallelogram, with thickened sections at specific locations. This design not only improves the strength of the scraper blade, enabling it to better cope with complex working environments, but also allows it to perform corresponding functions according to different scenarios, further enhancing the cleaning effect and the applicability of the device. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a schematic diagram illustrating the interaction between the scraper and the anaerobic tank in this invention;

[0031] Figure 3 This is a schematic diagram illustrating the rotation method of the scraper in this invention;

[0032] Figure 4 This is a schematic diagram of the scraper structure in the present invention. Figure 1 ;

[0033] Figure 5 This is a schematic diagram of the scraper structure in the present invention. Figure 2 ;

[0034] Figure 6 This is a schematic diagram of the scraper structure in the present invention. Figure 3 .

[0035] In the figure: 1. Drive unit; 2. Scraper blade; 11. Drive component; 12. Rotary seat; 13. Rotary electromagnet; 14. Telescopic cylinder; 21. First scraper section; 22. Second scraper section; 23. Connecting section; 211. Upper working surface; 212. Side working surface; 213. Lower working surface; 214. Thickened part. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] Currently, the traditional method for sludge removal from anaerobic digesters involves cleaning by rotating scrapers radially. However, this method has significant problems: the closer to the outer perimeter of the digester, the higher the linear velocity of the scrapers, resulting in greater resistance. This not only easily damages the scrapers but also leads to poor cleaning efficiency. Furthermore, traditional linear scrapers use a single plane to contact the sludge, failing to differentiate between the central (thinner sludge layer) and outer (thicker sludge layer) areas, and lack an angle adjustment mechanism, making it difficult to remove sludge from the digester walls.

[0038] To address these problems, this invention proposes an innovative technical solution:

[0039] The scraper blade 2 is designed with a Z-shaped structure, allowing for separate cleaning of the outer and central areas, thus effectively reducing pressure. Two methods for adjusting the position of scraper blade 2 are also designed:

[0040] The first method is to rotate around the vertical axis in the middle of the scraper 2. This method can not only adjust the position of the scraper 2, but also drive the scraper 2 to rotate on its own axis and revolve around the sun, thus achieving fine cleaning of the anaerobic tank.

[0041] The second method involves rotating the scraper 2 around its horizontal axis. This method requires the use of a telescopic cylinder 14 for lifting and lowering, allowing the scraper 2 to clean the perimeter of the anaerobic tank using its end. Furthermore, rotating the scraper 2 180° around its horizontal axis allows switching between two working modes; rotating it 90° makes the other side of the scraper 2 the working surface, and this working surface is continuous, achieving the same function as a regular scraper 2, thus accelerating the cleaning process when the sludge layer is shallow. The following are specific embodiments:

[0042] Example 1: As Figures 1-6 As shown, an anaerobic pond sludge removal device for wastewater treatment includes a scraper 2 and a drive unit 1. The drive unit 1 drives the scraper 2 to move. The drive unit 1 includes a rotating base 12 and a drive component 11. The drive component 11 includes, but is not limited to, a motor, a hydraulic motor, etc. In this embodiment, the drive component 11 is a three-phase asynchronous motor. The drive component 11 is connected to the rotating base 12 and can drive the rotating base 12 to move in a circular motion around the central axis of the anaerobic pond, thereby driving the scraper 2 mounted on the rotating base 12 to move in a circular scraping motion along the radial direction of the anaerobic pond. A rotating electromagnet 13 is fixedly mounted on the rotating base 12, and the output end of the rotating electromagnet 13 is fixedly connected to the scraper 2. This fixed connection can be achieved by welding to ensure the stability of the connection.

[0043] The scraper 2 includes a first scraper section 21, a connecting section 23, and a second scraper section 22 arranged sequentially along its length. The connecting section 23 is inclined relative to the horizontal plane, for example, at an angle of 30°, so that the first scraper section 21 and the second scraper section 22 are connected by a bend, forming two working surfaces, one high and one low. The high working surface refers to the working surface of the second scraper section 22 that is far from the bottom of the pool, and the low working surface refers to the working surface of the first scraper section 21 that is close to the bottom of the pool. The two are staggered by a height difference of 150mm through the 30° inclination angle of the connecting section 23.

[0044] Working Principle: When the rotating electromagnet 13 is energized, it drives the scraper 2 to rotate, changing the contact position between the first scraper section 21 and the second scraper section 22 and the inner wall of the anaerobic tank. For example, in the anaerobic tank of a wastewater treatment plant, this device can effectively distribute the pressure of the scraper 2 to different areas, reducing the damage rate of the scraper 2 by approximately 30% and extending its service life. By setting the scraper 2 as a segmented structure with bent connections (forming a "Z" shape), the first scraper section 21 and the second scraper section 22 are staggered in height. During the cleaning process, the central area and the outer area can be effectively cleaned separately, reducing the amount of sludge residue after cleaning by approximately 40% and improving the cleaning effect.

[0045] Example 2: Based on Example 1, this example further elaborates on the adjustment method for the rotation of the scraper 2 around the vertical axis. The rotating electromagnet 13 is mounted above the scraper 2 via a bracket and is fixedly connected to the connecting section 23 via a vertically positioned fixed shaft. The fixed shaft is made of 45# steel and has undergone heat treatment to achieve a hardness of HRC28-32. The connections between the rotating electromagnet 13 and the bracket, and between the vertical shaft and the scraper 2, are also made using welding.

[0046] Rotation Process: When the rotating electromagnet 13 is energized, it drives the scraper 2 to rotate 180° around the vertical axis, causing the circumferential positions of the first scraper section 21 and the second scraper section 22 to interchange. During the cleaning process, the scraper 2 is first adjusted so that the lower working surface of the first scraper section 21 contacts the central area of ​​the anaerobic tank, and the higher working surface of the second scraper section 22 contacts the outer area. The drive unit 11 is then activated, causing the scraper 2 to rotate at a speed of 3 rpm, using the higher working surface to perform initial cleaning of the outer area and remove loose sludge. Then, the rotating electromagnet 13 drives the scraper 2 to rotate 180°, so that the higher working surface of the first scraper section 21 contacts the central area, and the lower working surface of the second scraper section 22 contacts the outer area, continuing the cleaning process. This method allows for precise adjustment of the scraper 2, further improving the cleaning effect, especially when differentiating sludge from different areas, where it has a significant advantage. Through this refined cleaning method, the amount of sludge residue in the anaerobic tank is further reduced, by approximately 50% compared to traditional methods.

[0047] It should be noted that, based on the above structure, the position of the scraper 2 can be flexibly adjusted according to the sludge conditions in different areas. Specifically, the rotating electromagnet 13 drives the scraper 2 to rotate continuously around the vertical axis. While the scraper 2 rotates on its own axis, it also rotates around the rotating seat 12, thereby enabling fine cleaning of the anaerobic tank.

[0048] Example 3: A horizontal shaft is fixedly connected to the output end of the rotating electromagnet 13, and the other end of the horizontal shaft is fixedly connected to the end face of the scraper 2. When the rotating electromagnet 13 is energized, it can drive the scraper 2 to rotate 180° around the horizontal shaft, so that the high and low working surfaces of the first scraper section 21 and the second scraper section 22 are interchanged.

[0049] The drive unit 11 and the rotating seat 12 are connected by a telescopic cylinder 14, which has a lifting stroke range of 50-300mm. The cylinder body of the telescopic cylinder 14 is connected to the output end of the drive unit 11, and the piston rod is fixed to the bottom of the rotating seat 12, enabling the scraper 2 to move up and down along the central axis of the anaerobic tank. To prevent the output torque of the drive unit 11 from being transmitted to the telescopic cylinder 14 through the rotating seat 12, which could cause a deflection torque in the cylinder body, an anti-torsional reinforcement structure can be added to the outside of the telescopic cylinder 14: a guide key is set in the middle of the cylinder body, forming a sliding fit with the keyway at the output end of the drive unit 11. This ensures that when the scraper 2 is cleaning the sludge on the tank wall, the telescopic cylinder 14 only bears axial load, avoiding wear of the seals or bending of the piston rod due to excessive torque, and ensuring the smoothness and reliability of the lifting action.

[0050] Rotation process: When the rotating electromagnet 13 is energized, it can drive the scraper 2 to rotate 180° around the horizontal axis, so that the high and low working surfaces of the first scraper section 21 are interchanged; and the high and low working surfaces of the second scraper section 22 are interchanged. When it is necessary to switch between the two working conditions of the scraper 2, simply rotate it 180°.

[0051] When it is necessary to treat the sludge adhering to the tank wall, the telescopic cylinder 14 drives the scraper 2 to rise and fall along the central axis of the anaerobic tank, and the end of the scraper 2 is used to clean the peripheral walls of the anaerobic tank. In the anaerobic tank of the sewage treatment plant, when the sludge layer is shallow, the scraper 2 can be rotated 90° around the horizontal axis, so that the other side of the scraper 2 becomes the working surface, and this working surface is continuous, which can achieve the same function as a regular scraper and speed up the cleaning process.

[0052] Technical effects: This method not only allows for effective adjustment of the position of scraper 2, but also enables the cleaning of the anaerobic tank's perimeter walls and flexible switching under different operating conditions, greatly improving the applicability and cleaning efficiency of the sludge removal device. In practical applications, the cleaning effect on tank wall sludge is significant, with a sludge removal rate of approximately 90%.

[0053] It should be noted that Embodiments 2 and 3 are single options, belonging to parallel solutions. The two methods cannot exist simultaneously, let alone be implemented at the same time. For example, the vertical axis rotation mechanism of Embodiment 2 is suitable for fine cleaning of the entire bottom of the pool, while the horizontal axis rotation mechanism of Embodiment 3, in conjunction with the telescopic cylinder 14, is suitable for cleaning the pool wall. The two are structurally independent and cannot be implemented simultaneously.

[0054] The cross-section of the scraper 2 is quadrilateral, including an upper working surface 211 and a lower working surface 213 arranged in parallel, and a side working surface 212 that is inclinedly connected to both.

[0055] Example 4: In this example, the cross-section of the scraper 2 is a parallelogram. The upper working surface 211 and the lower working surface 213 are of equal width and parallel, both with a width of 80mm. The angle between the side working surface 212 and the upper and lower working surfaces 213 is 45°.

[0056] This structure is suitable for anaerobic ponds with relatively uniform sludge layers, such as those in small wastewater treatment plants. In this scenario, the parallelogram cross-section allows the scraper 2 to move more smoothly and evenly during the cleaning process, improving cleaning efficiency. Through practical application testing, with uniform sludge layers, using the scraper 2 with this cross-section improves cleaning efficiency by approximately 20% compared to traditional scrapers.

[0057] Example 5: In this example, the cross-section of the scraper 2 is an isosceles trapezoid, and the width of the upper working surface 211 is smaller than the width of the lower working surface 213. For example, the width of the upper working surface 211 is 60mm, and the width of the lower working surface 213 is 100mm. A thickened portion 214 is provided at the edge of the lower working surface 213 near the side working surface 212, and the thickness of the thickened portion 214 is 10mm.

[0058] The main body of the scraper blade 2 is made of high-strength alloy steel (e.g., 40Cr steel, with a hardness of HRC30-35 after quenching and tempering), which has good strength and wear resistance. The thickened part 214 is made of cemented carbide (e.g., YG8 cemented carbide, with a hardness of HRA89-91), which further improves the wear resistance and impact resistance of the scraper blade.

[0059] This structure is suitable for anaerobic tanks with thick sludge layers and hard sludge at the bottom. The thickened section 214 increases the strength of the scraper 2, enabling it to better cope with greater resistance. During the cleaning process, the isosceles trapezoidal cross-section allows the scraper 2 to cut into the sludge layer more effectively, improving the cleaning effect. In practical applications, this structure of the scraper 2 performs excellently when handling thick sludge layers and hard sludge; the service life of the scraper 2 is extended by approximately 30% compared to ordinary structures, and the cleaning effect is also significantly improved.

[0060] Example 6: This section details the method and steps for sludge removal using the anaerobic sludge removal device of the present invention:

[0061] S1. Initial position setting: By rotating the electromagnet 13, the scraper 2 is adjusted so that the low working surface of the first scraper section 21 contacts the central area of ​​the anaerobic tank, and the high working surface of the second scraper section 22 contacts the outer area. The working surfaces of both are the side action surfaces 212. The position of the scraper 2 is precisely adjusted according to the sludge distribution to ensure the efficient cleaning work.

[0062] S2. Initial cleaning: Start the drive unit 11, which drives the scraper 2 to make circular motion at a speed of 1-5 rpm. The high working surface is used to perform the initial cleaning of the outer area and remove the loose sludge on the surface. For example, in the anaerobic tank of the sewage treatment plant, the drive unit 11 drives the scraper 2 to perform the initial cleaning at a speed of 3 rpm. The cleaning of the loose sludge on the outer area is completed within 30 minutes, and the cleaning volume reaches about 5 cubic meters.

[0063] S3. Operating mode switching: The rotating electromagnet 13 drives the scraper 2 to rotate 180°, so that the high working surface of the first scraper section 21 contacts the central area, and the low working surface of the second scraper section 22 contacts the outer area. Through this switching, more effective cleaning can be carried out according to the characteristics of sludge in different areas.

[0064] S4. Secondary Cleaning: Keeping drive unit 11 running, the hard sludge remaining in the outer area is thoroughly removed using the low working surface. During the secondary cleaning process, after approximately 45 minutes of operation, the hard sludge remaining in the outer area is completely removed, reducing the amount of sludge residue to an extremely low level.

[0065] S5. Depth Adjustment: To remove sludge from the pool wall, adjust the height of the scraper 2 so that it acts on the pool wall to perform cleaning. For example, when cleaning sludge from the pool wall, raise the scraper 2 by 50mm using the telescopic cylinder 14, then rotate the horizontal axis 90° to switch to a continuous working surface, namely the upper working surface 211 and the lower working surface 213. Then drive the scraper 2 to clean the pool wall. After 15 minutes of cleaning, the sludge removal rate of the pool wall reaches approximately 95%.

[0066] S6. Fine-tuning step: After step S5, a fine-tuning step is added. The rotating electromagnet 13 is controlled to drive the scraper 2 to rotate slowly around the vertical axis at a speed of 0.3-0.5 rpm, so that the two parts of the scraper 2 simultaneously contact the center and outer transition area of ​​the pool bottom. The cleaning of the mud residue is completed by continuous low-speed rotation for 40-60 seconds.

[0067] The rotational speed of the drive component 11 is precisely controlled by a frequency converter to meet different cleaning requirements. The energization and de-energization of the rotating electromagnet 13 are controlled by a PLC to achieve automated operation.

[0068] As can be seen from the above embodiments, the anaerobic sludge removal device and method of the present invention have the following significant technical effects:

[0069] It effectively solves the problem of traditional scraper blades being easily damaged during sludge discharge in anaerobic ponds, significantly extending the service life of the scraper blades and reducing equipment maintenance costs.

[0070] It significantly improves the cleaning effect of anaerobic tanks, effectively cleaning both the central and outer areas, as well as the sludge on the tank walls, resulting in a significant reduction in sludge residue and improved wastewater treatment quality.

[0071] With two scraper position adjustment methods and different cross-sectional structure designs, the sludge removal device can adapt to various anaerobic pond conditions, exhibiting strong applicability and flexibility.

[0072] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sludge removal device for an anaerobic tank in wastewater treatment, comprising a scraper and a drive unit, wherein the drive unit is used to drive the scraper to move, characterized in that, The driving unit includes a rotating base and a driving component. A rotating electromagnet is fixedly installed on the rotating base, and the output end of the rotating electromagnet is fixedly connected to the scraper. The driving component is connected to the rotating base in a transmission manner, and can drive the rotating base to make a circular motion around the central axis of the anaerobic tank, thereby driving the scraper to make a circular sludge scraping motion along the radial direction of the anaerobic tank. The scraper includes a first scraper section, a connecting section and a second scraper section arranged sequentially along the length direction. The connecting section is inclined relative to the horizontal plane, so that the first scraper section and the second scraper section are bent and connected to form two working surfaces with one high and one low. When the rotating electromagnet is energized, it can drive the scraper to rotate, thereby changing the interaction position between the first and second scraper sections and the inner wall of the anaerobic tank. The output end of the rotating electromagnet is fixedly connected to a horizontal shaft, and the other end of the horizontal shaft is fixedly connected to the end face of the scraper. When the rotating electromagnet is energized, it can drive the scraper to rotate 180° around the horizontal shaft, so that the high and low working surfaces of the first and second scraper sections are interchanged.

2. The sludge removal device for anaerobic ponds in wastewater treatment according to claim 1, characterized in that, The drive unit and the rotating seat are connected by a telescopic cylinder. The cylinder body of the telescopic cylinder is connected to the output end of the drive unit, and the piston rod is fixed to the bottom of the rotating seat, which can drive the scraper to rise and fall along the central axis of the anaerobic tank.

3. A sludge removal device for an anaerobic tank in wastewater treatment according to any one of claims 1-2, characterized in that, The cross-section of the scraper is quadrilateral, including an upper working surface and a lower working surface arranged in parallel, and a side working surface that is inclinedly connected to both.

4. The sludge removal device for anaerobic tanks in wastewater treatment according to claim 3, characterized in that, The cross-section of the scraper is a parallelogram, and the upper working surface and the lower working surface are of equal width and parallel.

5. A sludge removal device for an anaerobic tank in wastewater treatment according to claim 3, characterized in that, The cross-section of the scraper is an isosceles trapezoid, and the width of the upper working surface is smaller than the width of the lower working surface.

6. A sludge removal device for an anaerobic tank in wastewater treatment according to claim 5, characterized in that, The lower working surface is provided with a thickened part at the edge near the side working surface.

7. A method for sludge removal from an anaerobic tank in wastewater treatment, employing the sludge removal device for an anaerobic tank in wastewater treatment as described in any one of claims 1-2, characterized in that, Includes the following steps: S1. Initial position setting: Adjust the scraper by rotating the electromagnet so that the low working surface of the first scraper section contacts the central area of ​​the anaerobic tank and the high working surface of the second scraper section contacts the outer area. S2. First cleaning: Start the drive unit to drive the scraper to make a circular motion at a speed of 1-5 rpm, and use the high working surface to perform the initial cleaning of the outer area to remove loose sludge from the surface; S3. Working condition switching: The rotating electromagnet drives the scraper to rotate 180°, so that the high working surface of the first scraper section contacts the central area, and the low working surface of the second scraper section contacts the outer area. S4. Secondary cleaning: Keep the drive unit running and use the low working surface to thoroughly remove the hard sludge remaining in the outer area; S5. Depth Adjustment: If it is necessary to treat the mud and scale attached to the pool wall, adjust the height of the scraper so that the scraper acts on the pool wall to perform cleaning.

8. A method for sludge removal from an anaerobic tank in wastewater treatment according to claim 7, characterized in that, Add a refinement step after step S5: The control electromagnet drives the scraper to rotate slowly around the vertical axis at a speed of 0.3-0.5 rpm, so that the two parts of the scraper simultaneously contact the center and outer transition area of ​​the pool bottom. The cleaning of mud residue is completed by continuous low-speed rotation for 40-60 seconds.

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