Pre-precipitation device for sewage treatment

Abstract

The utility model discloses a pre-precipitation device for sewage treatment, which comprises a precipitation box and a discharge box, the discharge box is connected below the precipitation box, and partition plates are vertically arranged between the discharge box and the inner walls of the two sides of the precipitation box. A first filter screen plate is vertically arranged between the inner walls of the two sides of the settling box and located over the partition plate, a through groove is formed between the first filter screen plate and the partition plate, a second filter screen plate is horizontally arranged on the upper portion of the settling box, a filter groove is formed above the second filter screen plate, and a settling area is arranged below the second filter screen plate; a waste discharge groove is formed in one side, far away from the filter groove and the settling area, of the first filter screen plate and the partition plate. The filtering effect of the second filtering net plate is guaranteed through a multi-layer filtering structure and corresponding cleaning parts, the sewage filtering efficiency and quality are improved, meanwhile, the floating object discharging mechanism can effectively treat floating objects, the sewage pretreatment effect is optimized, it is guaranteed that the follow-up sewage treatment process is carried out smoothly, and the system stability and the treatment efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a pre-sedimentation device for wastewater treatment. Background Technology

[0002] With the rapid development of industrialization and urbanization, the amount of sewage discharge is increasing day by day, and sewage treatment has become a key link in environmental protection. During the sewage treatment process, sewage often contains a variety of impurities, including solid particles of different sizes, grease, foam and other floating matter. If these impurities are not effectively removed, they will seriously affect the subsequent sewage treatment process, such as clogging pipes, reducing treatment efficiency and affecting treatment quality.

[0003] Traditional sedimentation devices are not precise enough in filtering wastewater, and cannot effectively handle the complex impurities in wastewater. For example, some sedimentation devices rely solely on simple sedimentation, which is ineffective in removing smaller solid particles and floating matter. Moreover, during the filtration process, the filter screen is easily clogged by impurities, and there is a lack of effective cleaning mechanisms, leading to a gradual decrease in filtration efficiency. This necessitates frequent shutdowns for maintenance, increasing treatment costs and time, and failing to meet the demands of modern wastewater treatment for efficient and continuous operation.

[0004] Therefore, we propose a pre-sedimentation device for wastewater treatment. Utility Model Content

[0005] The main purpose of this utility model is to provide a pre-sedimentation device for sewage treatment. In order to prevent impurities in sewage from causing problems such as clogging of pipes, reduced treatment efficiency, and affected treatment quality in subsequent sewage treatment processes, and to avoid the problems of traditional sedimentation devices such as imprecise filtration, poor removal of floating matter and small particulate solids, easy clogging of filter screens and lack of effective cleaning mechanism, which lead to increased treatment costs, extended treatment time and inability to operate efficiently and continuously, the device can improve the efficiency and quality of sewage treatment, ensure the stable and efficient operation of the sewage treatment system, and effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A pre-sedimentation device for wastewater treatment includes a sedimentation tank and a discharge tank. The discharge tank is connected to the bottom of the sedimentation tank, and a partition is vertically installed between the inner walls of the discharge tank and the sedimentation tank on both sides. A first filter screen is vertically installed between the inner walls of the sedimentation tank on both sides and directly above the partition, and a through groove is opened between the first filter screen and the partition. A second filter screen is horizontally installed at the top of the sedimentation tank. A filter groove is provided above the second filter screen and a sedimentation zone is provided below it. A waste discharge trough is provided on the side of the first filter screen and the partition away from the filter groove and the sedimentation zone.

[0008] The sedimentation tank has a first lead screw rotatably connected to the inner walls at both ends and above the second filter screen. One end of the first lead screw extends to the outside of the sedimentation tank and is fixedly connected to a first pulley. A bracket is fixedly installed on the upper part of the sedimentation tank near the first pulley. A first drive motor is fixedly connected to one end of the bracket. The output shaft of the first drive motor passes through the bracket and is fixedly connected to the first pulley. The sedimentation tank has a second lead screw rotatably connected to the inner walls at both ends and below the second filter screen. One end of the second lead screw extends to the outside of the sedimentation tank and is fixedly connected to a second pulley. The second pulley and the first pulley are connected by a belt. The first lead screw is threaded with a first sliding sleeve. A first scraper is fixedly connected to the bottom end of the first sliding sleeve and is in contact with the upper surface of the second filter screen. The second lead screw is threaded with a second sliding sleeve. A second scraper is fixedly connected to the top end of the second sliding sleeve and is in contact with the lower surface of the second filter screen.

[0009] A flotation mechanism is provided on the partition plate. The flotation mechanism consists of a rotating column and a scooping bucket. A second drive motor is fixedly installed on one side of the sedimentation tank. The output shaft of the second drive motor extends into the interior of the sedimentation tank and is fixedly connected to one end of the rotating column. Multiple scooping buckets are arranged in a circular array around the rotating column. A flotation trough is provided between adjacent scooping buckets.

[0010] By adopting the above technical solution, wastewater first enters the filter tank at the top of the sedimentation tank. Here, the second filter screen begins to function, performing preliminary filtration of the wastewater and intercepting larger solid impurities. For example, larger suspended solids such as leaves and plastic fragments are blocked above the second filter screen. After preliminary filtration, the wastewater passes through the mesh of the second filter screen into the sedimentation zone below. In the sedimentation zone, suspended solid particles in the wastewater begin to settle under the influence of gravity. Over time, heavier solid particles gradually settle to the bottom of the sedimentation zone.

[0011] When the second filter screen needs cleaning, the first drive motor is activated. The first drive motor drives the first pulley to rotate, which in turn drives the second pulley to rotate via a belt. This causes the first and second lead screws to rotate synchronously. The first sliding sleeve on the first lead screw moves under the threaded drive of the lead screw. The first scraper at the bottom of the first sliding sleeve is in close contact with the upper surface of the second filter screen. As the first sliding sleeve moves, the first scraper scrapes impurities on the upper surface of the second filter screen through the channel to the waste discharge trough. At the same time, the second sliding sleeve on the second lead screw also moves, and the second scraper at the top of the second sliding sleeve is in contact with the lower surface of the second filter screen, scraping impurities on the lower surface of the second filter screen to the waste discharge trough. In this way, through the coordinated action of the upper and lower scrapers, the second filter screen can be effectively cleaned, preventing clogging and ensuring the filtration effect.

[0012] When there are floating objects such as grease and foam in the wastewater, the second drive motor is started. The second drive motor drives the rotating column to rotate, and the circular array of scooping buckets on the rotating column rotates accordingly. When the scooping buckets rotate to the location of the floating objects, the floating objects and impurities scraped off by the second scraper will be scooped up. As the scooping buckets continue to rotate, when they reach the position of the discharge trough, the floating objects and impurities will be discharged from the sedimentation tank through the discharge trough, thereby cleaning the floating objects and impurities and avoiding interference with the subsequent treatment process.

[0013] The sludge settled at the bottom of the settling zone and the impurities scraped onto the waste discharge trough by the scraper will eventually be discharged through the discharge box connected below the settling tank for subsequent sludge treatment and other operations.

[0014] Furthermore, sliding rods are fixedly connected to the inner walls of both ends of the sedimentation tank, above and below the second filter screen. Slide plates are slidably connected to the outside of the two sliding rods, and the two slide plates are fixedly connected to the top of the first scraper and the bottom of the second scraper, respectively.

[0015] By adopting the above technical solution, when the first drive motor starts and the first and second lead screws begin to rotate, the first and second scrapers will move along the upper and lower surfaces of the second filter screen under the drive of the lead screws. At this time, the sliding plate, which is fixedly connected to the top and bottom of the first and second scrapers, will slide on the sliding rod. The sliding rod plays a guiding role, ensuring that the first and second scrapers can move in a straight line. At the same time, the sliding connection between the sliding plate and the sliding rod provides stable support for the scrapers. The sliding rod bears the lateral force that may be generated during the movement of the scrapers, preventing the scrapers from shaking.

[0016] Furthermore, a drain pipe is fixedly connected to one end of the sedimentation tank, and a water pump is fixedly installed on the upper part of the sedimentation tank at the same end as the drain pipe.

[0017] By adopting the above technical solution, the wastewater after sedimentation and filtration is discharged from the sedimentation tank through the drain pipe;

[0018] As a power source, the water pump can generate sufficient pressure to enable sewage to overcome factors such as pipeline resistance and gravity, allowing the sewage to enter the sedimentation tank.

[0019] Furthermore, the water pump has an inlet pipe fixedly connected to its suction end and an outlet pipe fixedly connected to its discharge end, with multiple outlets arranged horizontally at the bottom of the outlet pipe.

[0020] By adopting the above technical solution, after the water pump starts, the impeller rotates and generates negative pressure at the inlet pipe end. Under the action of external atmospheric pressure, sewage is sucked into the inlet pipe and enters the water pump. The impeller inside the water pump rotates at high speed and uses centrifugal force to transport the sewage from the suction end to the discharge end, so that the sewage enters the outlet pipe. The sewage is evenly distributed into the sedimentation tank through multiple outlets at the bottom of the outlet pipe, avoiding excessive local impact and facilitating subsequent sedimentation and filtration.

[0021] Furthermore, a waste discharge pipe is fixedly connected to the bottom of the discharge box, and the waste discharge pipe is connected to the waste discharge trough.

[0022] By adopting the above technical solution, impurities in the sedimentation tank are mainly collected through the waste discharge tank and the flotation mechanism. These impurities include solid waste and floating matter scraped off from the upper and lower surfaces of the second filter screen by the first and second scrapers. The waste discharge pipe is connected to the waste discharge tank, providing a channel for these impurities to be discharged from the waste discharge tank. When the impurities enter the waste discharge tank, they will naturally flow towards the waste discharge pipe due to gravity. When it is necessary to discharge the impurities, by opening the valve on the waste discharge pipe, the impurities will be discharged from the waste discharge tank through the waste discharge pipe into the discharge box under the action of gravity. The waste discharge pipe is located at the bottom of the discharge box. This design is conducive to utilizing gravity to allow the impurities to flow out smoothly and can transport the impurities to the subsequent sludge treatment system or designated waste collection point for further treatment.

[0023] Furthermore, a drain pipe is fixedly connected to the bottom of the discharge box, and the drain pipe is connected to the sedimentation zone.

[0024] By adopting the above technical solution, in the sedimentation zone of the sedimentation tank, solid particles in the wastewater settle to the bottom of the sedimentation zone under the action of gravity. The discharge box is located below the sedimentation tank, and its bottom drain pipe is connected to the sedimentation zone, thus forming a channel for collecting settled sludge. As the sedimentation process continues, sludge gradually accumulates at the bottom of the sedimentation zone. Under the action of gravity, this sludge will naturally flow downhill, that is, converge towards the drain pipe. When it is necessary to discharge the settled sludge, by opening the valve on the drain pipe, the sludge will be discharged from the discharge box under the action of gravity. This design of the drain pipe can effectively discharge the sludge from the sedimentation zone for subsequent sludge treatment, such as sludge dewatering, drying, or further harmless treatment. This can prevent excessive accumulation of sludge in the sedimentation zone, thereby affecting the sedimentation effect and the normal operation of the entire wastewater treatment plant.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) This utility model provides a pre-sedimentation device for sewage treatment. The pre-sedimentation device is equipped with a multi-layer filtration structure. The second filter screen performs preliminary filtration of sewage and can effectively intercept larger solid impurities, such as leaves and plastic fragments, to prevent them from entering the subsequent treatment stage. At the same time, under the coordinated action of the first drive motor, the first lead screw, the second lead screw, the first scraper and the second scraper, the second filter screen can be thoroughly cleaned periodically to prevent it from clogging. This method of cleaning the upper and lower scrapers at the same time ensures the filtration effect of the filter screen, enabling it to work continuously and efficiently, greatly improving the sewage filtration efficiency and quality, and reducing the problem of treatment interruption caused by filter screen clogging.

[0027] (2) The present invention provides a pre-sedimentation device for sewage treatment. The flotation mechanism in the device consists of a rotating column and a flotation bucket. The rotating column is driven to rotate by a second drive motor, so that the flotation bucket can pick up floating objects (such as grease, foam, etc.) in the sewage. In addition, the flotation trough set between the flotation buckets can discharge the picked-up floating objects from the sedimentation tank in a timely manner, avoiding the accumulation of floating objects in the sedimentation tank and interfering with the subsequent treatment process. This effective treatment of floating objects further optimizes the pretreatment effect of sewage, provides a guarantee for the smooth operation of the subsequent sewage treatment process, and helps to improve the stability and treatment efficiency of the entire sewage treatment system. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a pre-sedimentation device for sewage treatment according to the present invention.

[0029] Figure 2 This is a schematic diagram of the internal structure of a pre-sedimentation device for wastewater treatment according to the present invention.

[0030] Figure 3 This utility model relates to a pre-sedimentation device for wastewater treatment. Figure 1 Enlarged view of point A in the middle.

[0031] Figure 4 This is a schematic diagram of the flotation mechanism of a pre-sedimentation device for sewage treatment according to the present invention.

[0032] In the diagram: 1. Sedimentation tank; 2. Discharge tank; 3. First filter screen; 4. Baffle plate; 5. Second filter screen; 6. Through channel; 7. Waste discharge channel; 8. Filter channel; 9. First lead screw; 10. First sliding sleeve; 11. First scraper; 12. First pulley; 13. Support; 14. First drive motor; 15. Second lead screw; 16. Second pulley; 17. Belt; 18. Second sliding sleeve; 19. Second scraper; 20. Float removal mechanism; 21. Second drive motor; 22. Rotary column; 23. Float scoop; 24. Float removal channel; 25. Sliding rod; 26. Slide plate; 27. Water pump; 28. Inlet pipe; 29. ​​Outlet pipe; 30. Drainage pipe; 31. Waste discharge pipe; 32. Sewage discharge pipe; 33. Water outlet. Detailed Implementation

[0033] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0034] To prevent impurities in wastewater from clogging pipes, reducing treatment efficiency, and affecting treatment quality in subsequent wastewater treatment processes, and to avoid the problems of traditional sedimentation devices such as imprecise filtration, poor removal of floating solids and small particulate matter, easy clogging of filter screens, and lack of effective cleaning mechanisms, which lead to increased treatment costs, extended treatment times, and inefficient continuous operation, thereby improving wastewater treatment efficiency and quality and ensuring the stable and efficient operation of the wastewater treatment system, such as... Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a pre-sedimentation device for wastewater treatment includes a sedimentation tank 1 and a discharge tank 2. The discharge tank 2 is connected to the lower part of the sedimentation tank 1, and a partition 4 is vertically arranged between the inner walls of the discharge tank 2 and the sedimentation tank 1 on both sides. A first filter screen 3 is vertically arranged between the inner walls of the sedimentation tank 1 on both sides and directly above the partition 4. A through groove 6 is opened between the first filter screen 3 and the partition 4. A second filter screen 5 is horizontally arranged at the upper part of the sedimentation tank 1. A filter groove 8 is provided above the second filter screen 5 and a sedimentation zone is provided below it. A waste discharge groove 7 is provided on the side of the first filter screen 3 and the partition 4 away from the filter groove 8 and the sedimentation zone.

[0035] A first lead screw 9 is rotatably connected to the inner walls of both ends of the sedimentation tank 1 and above the second filter screen plate 5. One end of the first lead screw 9 extends to the outside of the sedimentation tank 1 and is fixedly connected to a first pulley 12. A bracket 13 is fixedly installed on the upper part of the sedimentation tank 1 near the first pulley 12. A first drive motor 14 is fixedly connected to one end of the bracket 13. The output shaft of the first drive motor 14 passes through the bracket 13 and is fixedly connected to the first pulley 12. A second lead screw 15 is rotatably connected to the inner walls of both ends of the sedimentation tank 1 and below the second filter screen plate 5. One end of rod 15 extends to the outside of sedimentation tank 1 and is fixedly connected to a second pulley 16. The second pulley 16 is connected to the first pulley 12 by a belt 17. The external thread of the first lead screw 9 is connected to a first sliding sleeve 10. The bottom end of the first sliding sleeve 10 is fixedly connected to a first scraper 11, and the first scraper 11 is in contact with the upper end face of the second filter screen 5. The external thread of the second lead screw 15 is connected to a second sliding sleeve 18. The top end of the second sliding sleeve 18 is fixedly connected to a second scraper 19, and the second scraper 19 is in contact with the lower end face of the second filter screen 5.

[0036] A flotation mechanism 20 is provided on the partition 4. The flotation mechanism 20 consists of a rotating column 22 and a scooping bucket 23. A second drive motor 21 is fixedly installed on one side of the sedimentation tank 1. The output shaft of the second drive motor 21 extends into the interior of the sedimentation tank 1 and is fixedly connected to one end of the rotating column 22. Multiple scooping buckets 23 are arranged in a circular array around the circular rotating column 22. A flotation trough 24 is provided between adjacent scooping buckets 23.

[0037] In operation, wastewater first enters the filter tank 8 at the top of the sedimentation tank 1. Here, the second filter plate 5 begins to function, performing preliminary filtration of the wastewater and intercepting larger solid impurities. For example, larger suspended solids such as leaves and plastic fragments are blocked above the second filter plate 5. After preliminary filtration, the wastewater passes through the mesh of the second filter plate 5 into the sedimentation zone below. In the sedimentation zone, suspended solid particles in the wastewater begin to settle under the influence of gravity. Over time, heavier solid particles gradually settle to the bottom of the sedimentation zone.

[0038] When the second filter screen 5 needs cleaning, the first drive motor 14 is started. The first drive motor 14 drives the first pulley 12 to rotate, and the first pulley 12 drives the second pulley 16 to rotate through the belt 17, thereby causing the first lead screw 9 and the second lead screw 15 to rotate synchronously. The first sliding sleeve 10 on the first lead screw 9 will move under the thread drive of the lead screw. The first scraper 11 at the bottom of the first sliding sleeve 10 is in close contact with the upper end face of the second filter screen 5. As the first sliding sleeve 10 moves, the first scraper 11 scrapes the impurities on the upper surface of the second filter screen 5 through the through groove 6 to the waste discharge groove 7. At the same time, the second sliding sleeve 18 on the second lead screw 15 will also move. The second scraper 19 at the top of the second sliding sleeve 18 is in contact with the lower end face of the second filter screen 5, scraping the impurities on the lower surface of the second filter screen 5 to the waste discharge groove 7. In this way, through the synergistic action of the upper and lower scrapers, the second filter screen 5 can be effectively cleaned, preventing it from clogging and ensuring the filtration effect.

[0039] When there are floating objects such as grease and foam in the sewage, the second drive motor 21 is started. The second drive motor 21 drives the rotating column 22 to rotate, and the floating buckets 23 in the ring array on the rotating column 22 rotate accordingly. When the floating buckets 23 rotate to the position of the floating objects, the floating objects and impurities scraped off by the second scraper 19 will be picked up by the action of the second scraper 19. As the floating buckets 23 continue to rotate, when they reach the position of the discharge trough 24, the floating objects and impurities will be discharged from the sedimentation tank 1 through the discharge trough 24, thereby cleaning the floating objects and impurities and avoiding interference with the subsequent treatment process.

[0040] The sludge settled at the bottom of the settling zone and the impurities scraped onto the waste discharge trough 7 by the scraper will eventually be discharged through the discharge box 2 connected below the settling tank 1 for subsequent sludge treatment and other operations.

[0041] For example, such as Figure 3 As shown, the present invention also includes sliding rods 25 fixedly connected to the inner walls of both ends of the sedimentation tank 1 and above and below the second filter screen plate 5, and sliding plates 26 slidably connected to the outside of the two sliding rods 25, and the two sliding plates 26 are respectively fixedly connected to the top end of the first scraper 11 and the bottom end of the second scraper 19.

[0042] In use, when the first drive motor 14 starts and the first lead screw 9 and the second lead screw 15 begin to rotate, the first scraper 11 and the second scraper 19 will move along the upper and lower surfaces of the second filter screen 5 respectively under the drive of the lead screw. At this time, the slide plate 26, which is fixedly connected to the top of the first scraper 11 and the bottom of the second scraper 19, will slide on the slide rod 25. The slide rod 25 plays a guiding role, ensuring that the first scraper 11 and the second scraper 19 can move in a straight line. At the same time, the sliding connection between the slide plate 26 and the slide rod 25 provides stable support for the scraper. The slide rod 25 bears the lateral force that may be generated during the movement of the scraper, preventing the scraper from shaking.

[0043] For example, such as Figure 1 As shown, the present invention also includes a drain pipe 30 fixedly connected to one end of the sedimentation tank 1, and a water pump 27 fixedly installed on the upper part of the sedimentation tank 1 at the same end as the drain pipe 30.

[0044] During use, the wastewater after sedimentation and filtration is discharged from the sedimentation tank 1 through the drain pipe 30;

[0045] As a power source, the water pump 27 can generate sufficient pressure to enable the sewage to overcome factors such as pipeline resistance and gravity, and to enter the sedimentation tank 1.

[0046] For example, such as Figure 1 , Figure 3 As shown, the present invention also includes an inlet pipe 28 fixedly connected to the suction end of the water pump 27, an outlet pipe 29 fixedly connected to the discharge end of the water pump 27, and a plurality of outlets 33 arranged horizontally at the bottom end of the outlet pipe 29.

[0047] When in use, after the water pump 27 is started, the impeller rotates and generates negative pressure at the inlet pipe 28. Under the action of external atmospheric pressure, sewage is sucked into the inlet pipe 28 and enters the water pump 27. The impeller inside the water pump 27 rotates at high speed and uses centrifugal force to transport the sewage from the suction end to the discharge end, so that the sewage enters the outlet pipe 29. The sewage is evenly distributed into the sedimentation tank 1 through the multiple outlets 33 at the bottom of the outlet pipe 29, avoiding excessive local impact and facilitating subsequent sedimentation and filtration.

[0048] For example, such as Figure 2 As shown, the present invention also includes a waste discharge pipe 31 fixedly connected to the bottom end of the discharge box 2, and the waste discharge pipe 31 is connected to the waste discharge trough 7.

[0049] During use, impurities in the sedimentation tank 1 are mainly collected through the waste discharge tank 7 and the flotation mechanism 20. These impurities include solid waste and floating matter scraped off from the upper and lower surfaces of the second filter screen 5 by the first scraper 11 and the second scraper 19. The waste discharge pipe 31 is connected to the waste discharge tank 7, providing a channel for these impurities to be discharged from the waste discharge tank 7. When impurities enter the waste discharge tank 7, they will naturally flow towards the waste discharge pipe 31 due to gravity. When it is necessary to discharge impurities, by opening the valve on the waste discharge pipe 31, the impurities will be discharged from the waste discharge tank 7 through the waste discharge pipe 31 into the discharge box 2 under the action of gravity. The waste discharge pipe 31 is located at the bottom of the discharge box 2. This design is conducive to utilizing gravity to allow impurities to flow out smoothly and to transport the impurities to the subsequent sludge treatment system or designated waste collection point for further treatment.

[0050] For example, such as Figure 2 As shown, the present invention also includes a sewage pipe 32 fixedly connected to the bottom end of the discharge box 2, and the sewage pipe 32 is connected to the sedimentation zone.

[0051] During operation, in the sedimentation zone of sedimentation tank 1, solid particles in the wastewater settle to the bottom of the sedimentation zone under gravity. Discharge tank 2 is located below sedimentation tank 1, and its bottom drain pipe 32 is connected to the sedimentation zone, forming a channel for collecting settled sludge. As the sedimentation process continues, sludge gradually accumulates at the bottom of the sedimentation zone. Under gravity, this sludge naturally flows downwards, converging towards the drain pipe 32. When it is necessary to discharge the settled sludge, the valve on the drain pipe 32 is opened, and the sludge is discharged into discharge tank 2 under gravity. This design of the drain pipe 32 effectively discharges the sludge from the sedimentation zone for subsequent sludge treatment, such as dewatering, drying, or further harmless treatment. This prevents excessive sludge accumulation in the sedimentation zone, which could affect the sedimentation effect and the normal operation of the entire wastewater treatment device.

[0052] It should be noted that this utility model is a pre-sedimentation device for sewage treatment. When the water pump 27 is started, the impeller of the water pump 27 rotates and generates negative pressure at the end of the inlet pipe 28. Under the action of the external atmospheric pressure, the sewage is sucked into the inlet pipe 28 and enters the water pump 27. The impeller inside the water pump 27 rotates at high speed and uses centrifugal force to transport the sewage from the suction end to the discharge end, so that the sewage enters the outlet pipe 29. The sewage is evenly distributed into the sedimentation tank 1 through the multiple outlets 33 at the bottom of the outlet pipe 29, avoiding excessive local impact and facilitating subsequent sedimentation and filtration.

[0053] Wastewater first enters the filter tank 8 at the top of the sedimentation tank 1. Here, the second filter screen 5 performs preliminary filtration of the wastewater, intercepting larger solid impurities in the wastewater. For example, larger suspended solids such as leaves and plastic fragments will be blocked above the second filter screen 5. After preliminary filtration, the wastewater enters the sedimentation zone below the second filter screen 5 through the mesh of the second filter screen 5. In the sedimentation zone, the suspended solid particles in the wastewater begin to settle under the action of gravity. Over time, the heavier solid particles gradually settle to the bottom of the sedimentation zone.

[0054] When the second filter screen 5 needs cleaning, the first drive motor 14 is started. The first drive motor 14 drives the first pulley 12 to rotate, and the first pulley 12 drives the second pulley 16 to rotate through the belt 17, thereby causing the first lead screw 9 and the second lead screw 15 to rotate synchronously. The first sliding sleeve 10 on the first lead screw 9 will move under the thread drive of the lead screw. The first scraper 11 at the bottom of the first sliding sleeve 10 is in close contact with the upper end face of the second filter screen 5. As the first sliding sleeve 10 moves, the first scraper 11 scrapes the impurities on the upper surface of the second filter screen 5 through the through groove 6 to the waste discharge groove 7; at the same time, the first scraper 11 on the second lead screw 15... The second sliding sleeve 18 also moves. The second scraper 19 at the top of the second sliding sleeve 18 is in contact with the lower end face of the second filter screen 5, scraping the impurities on the lower surface of the second filter screen 5 toward the waste discharge trough 7. When the first drive motor 14 starts and the first lead screw 9 and the second lead screw 15 start to rotate, the slide plate 26, which is fixedly connected to the top of the first scraper 11 and the bottom of the second scraper 19, will slide on the slide rod 25. The slide rod 25 plays a guiding role, ensuring that the first scraper 11 and the second scraper 19 can move in a straight line. At the same time, the sliding connection between the slide plate 26 and the slide rod 25 provides stable support for the scraper and prevents the scraper from shaking.

[0055] When there are floating objects such as grease and foam in the sewage, the second drive motor 21 is started. The second drive motor 21 drives the rotating column 22 to rotate, and the floating buckets 23 in the ring array on the rotating column 22 rotate accordingly. When the floating buckets 23 rotate to the position of the floating objects, they will pick up the floating objects and the impurities scraped off by the second scraper 19. As the floating buckets 23 continue to rotate, when they reach the position of the discharge trough 24, the floating objects and impurities will be discharged from the sedimentation tank 1 through the discharge trough 24, thereby cleaning the floating objects and impurities and avoiding interference with the subsequent treatment process.

[0056] The sludge settled at the bottom of the sedimentation zone and the impurities scraped onto the waste discharge trough 7 by the scraper will eventually be discharged through the discharge box 2 connected below the sedimentation tank 1. The impurities are mainly collected through the waste discharge trough 7 and the flotation mechanism 20. These impurities include solid waste and floating matter scraped off from the upper and lower surfaces of the second filter screen 5 by the first scraper 11 and the second scraper 19. The waste discharge pipe 31 is connected to the waste discharge trough 7, providing a channel for these impurities to be discharged from the waste discharge trough 7. When the impurities enter the waste discharge trough 7, they will naturally flow towards the waste discharge pipe 31 due to gravity. When it is necessary to discharge the impurities, by opening the valve on the waste discharge pipe 31, the impurities will be discharged from the waste discharge trough 7 through the waste discharge pipe 31 to the discharge box 2 under the action of gravity.

[0057] In the sedimentation zone of sedimentation tank 1, solid particles in the wastewater settle to the bottom of the sedimentation zone under the action of gravity. Discharge tank 2 is located below sedimentation tank 1, and its bottom drain pipe 32 is connected to the sedimentation zone, thus forming a channel for collecting settled sludge. When it is necessary to discharge settled sludge, the valve on the drain pipe 32 is opened, and the sludge will be discharged into discharge tank 2 under the action of gravity through the drain pipe 32.

[0058] After sedimentation and filtration, the wastewater is discharged from sedimentation tank 1 through drain pipe 30.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pre-sedimentation device for wastewater treatment, comprising a sedimentation tank (1) and a discharge tank (2), characterized in that, The discharge box (2) is connected to the bottom of the sedimentation box (1), and a partition (4) is vertically arranged between the inner walls of the discharge box (2) and the sedimentation box (1). A first filter screen (3) is vertically arranged between the inner walls of the sedimentation box (1) and directly above the partition (4), and a through groove (6) is opened between the first filter screen (3) and the partition (4). A second filter screen (5) is horizontally arranged at the top of the sedimentation box (1). A filter groove (8) is provided above the second filter screen (5), and a sedimentation area is provided below it. A waste discharge groove (7) is provided on the side of the first filter screen (3) and the partition (4) away from the filter groove (8) and the sedimentation area. The sedimentation tank (1) has a first lead screw (9) rotatably connected to the inner walls of both ends and above the second filter screen (5). One end of the first lead screw (9) extends to the outside of the sedimentation tank (1) and is fixedly connected to a first pulley (12). A bracket (13) is fixedly installed on the upper part of the sedimentation tank (1) near the first pulley (12). One end of the bracket (13) is fixedly connected to a first drive motor (14). The output shaft of the first drive motor (14) passes through the bracket (13) and is fixedly connected to the first pulley (12). The sedimentation tank (1) has a second lead screw (15) rotatably connected to the inner walls of both ends and below the second filter screen (5). One end of (15) extends to the outside of the sedimentation tank (1) and is fixedly connected to a second pulley (16). The second pulley (16) is connected to the first pulley (12) by a belt (17). The external thread of the first screw (9) is connected to a first sliding sleeve (10). The bottom end of the first sliding sleeve (10) is fixedly connected to a first scraper (11), and the first scraper (11) is in contact with the upper end face of the second filter screen (5). The external thread of the second screw (15) is connected to a second sliding sleeve (18). The top end of the second sliding sleeve (18) is fixedly connected to a second scraper (19), and the second scraper (19) is in contact with the lower end face of the second filter screen (5). A flotation mechanism (20) is provided on the partition (4). The flotation mechanism (20) consists of a rotating column (22) and a scooping bucket (23). A second drive motor (21) is fixedly installed on one side of the sedimentation tank (1). The output shaft of the second drive motor (21) extends into the interior of the sedimentation tank (1) and is fixedly connected to one end of the rotating column (22). Multiple scooping buckets (23) are arranged in a circular array with the rotating column (22) as the center. A flotation trough (24) is provided between adjacent scooping buckets (23).

2. The pre-sedimentation device for wastewater treatment according to claim 1, characterized in that: The sedimentation tank (1) has slide rods (25) fixedly connected to the inner walls at both ends, above and below the second filter screen (5). Slide plates (26) are slidably connected to the outside of the two slide rods (25). The two slide plates (26) are fixedly connected to the top of the first scraper (11) and the bottom of the second scraper (19), respectively.

3. The pre-sedimentation device for wastewater treatment according to claim 1, characterized in that: A drain pipe (30) is fixedly connected to one end of the sedimentation tank (1), and a water pump (27) is fixedly installed on the upper part of the sedimentation tank (1) at the same end as the drain pipe (30).

4. A pre-sedimentation device for wastewater treatment according to claim 3, characterized in that: The water pump (27) has an inlet pipe (28) fixedly connected to its suction end and an outlet pipe (29) fixedly connected to its discharge end. The bottom end of the outlet pipe (29) has multiple outlets (33) arranged horizontally.

5. A pre-sedimentation device for wastewater treatment according to claim 4, characterized in that: The bottom end of the discharge box (2) is fixedly connected to a waste discharge pipe (31), and the waste discharge pipe (31) is connected to the waste discharge trough (7).

6. A pre-sedimentation device for wastewater treatment according to claim 1, characterized in that: The bottom end of the discharge box (2) is fixedly connected to a drain pipe (32), which is connected to the sedimentation zone.

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