Recycling sedimentation tank

Abstract

The utility model belongs to the technical field of wastewater treatment, and particularly relates to a recycling sedimentation tank which comprises a tank body, a containing cavity is formed in the tank body, a first partition plate, a second partition plate and a third partition plate are sequentially arranged in the containing cavity, a mixing cavity is formed by the first partition plate and the head end of the containing cavity, and a through hole communicated with an air floating cavity is formed in the lower side of the first partition plate. The containing cavity between the first partition plate and the second partition plate forms an air flotation cavity, the containing cavity between the second partition plate and the third partition plate forms a separation cavity, a skimming assembly is arranged on the upper portion of the separation cavity, a water outlet cavity is formed by the third partition plate and the tail end of the containing cavity, and water passing openings are reserved in the third partition plate and the bottom of the containing cavity. After the waste water enters the mixing cavity and is mixed with the liquid medicine, the papermaking waste water can be rapidly purified, scum can be removed, meanwhile, the power consumption can be reduced, and the operation cost of the equipment can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a recycling sedimentation tank. Background Technology

[0002] Wastewater generated during the papermaking process contains a large amount of cellulose, fillers and other suspended solids. The air flotation machine generates a large number of tiny bubbles, which cause these suspended substances to combine with the bubbles and float to the surface of the water, thereby achieving efficient separation.

[0003] However, in the existing air flotation machine, if the scraper is set to be long during the separation process, the scraper needs to provide a large force at the beginning to resist the water flow and scum. If it is set to be short, cellulose, filler and other suspended solids can easily flow over the underside of the scraper, resulting in less scum being sent into the skimming pipe by the scraper, which increases production costs. Utility Model Content

[0004] This invention provides a recycling sedimentation tank, which solves the problems of the following drawbacks: if the scraper is set to be too long, the scraper needs to provide a large force at the beginning to resist the water flow and scum; if it is set to be too short, cellulose, filler and other suspended solids can easily flow over the underside of the scraper, resulting in less scum sent into the skimming pipe by the scraper, which increases the production cost.

[0005] This utility model provides the following technical solution:

[0006] A recycling sedimentation tank includes a tank body with a receiving cavity inside. A first partition, a second partition, and a third partition are sequentially arranged within the receiving cavity. The first partition and the first end of the receiving cavity form a mixing cavity. A through hole communicating with a flotation cavity is provided on the lower side of the first partition. The receiving cavity between the first and second partitions forms a flotation cavity, and the receiving cavity between the second and third partitions forms a separation cavity. A skimming assembly is provided at the upper part of the separation cavity. The third partition and the end of the receiving cavity form an outlet cavity, and a water outlet is provided at the bottom of the third partition and the receiving cavity. A skimming pipe is provided at the top of the third partition. Wastewater enters the mixing cavity and mixes with the chemical solution, then enters the flotation cavity through the through hole. After flotation, it enters the separation cavity through the upper part of the second partition. The scum floats upward and is collected by the skimming assembly into the skimming pipe. The liquid separated from the wastewater enters the outlet cavity from the water outlet on the lower side of the third partition.

[0007] In one possible implementation, the mixing chamber is equipped with a stirring assembly, a dosing pipe, and a water inlet pipe. After the medicine and wastewater enter the mixing chamber, they are stirred and mixed by the stirring assembly.

[0008] In one possible implementation, the bottom of the mixing chamber, flotation chamber, separation chamber, and effluent chamber are all provided with slag discharge pipes.

[0009] In one possible implementation, a dissolved air tank is provided on one side of the pool body. The air inlet pipe of the dissolved air tank is connected to an air compressor, which supplies compressed air into the dissolved air tank through the air inlet pipe. The water inlet pipe of the dissolved air tank is connected to a pressurized water pump, which supplies pressurized water into the dissolved air tank through the water inlet pipe. The pressurized water and compressed air mix in the dissolved air tank to form dissolved air water. The water outlet pipe of the dissolved air tank is connected to a dissolved air release device, which is installed in the air flotation chamber.

[0010] In one possible implementation, a filter is provided between the dissolved gas tank and the dissolved gas release device.

[0011] In one possible implementation, the skimming assembly includes a first rotating shaft and a second rotating shaft disposed at the top of the pool. The first rotating shaft is provided with a plurality of first sprockets, and the second rotating shaft is provided with a plurality of second sprockets. A chain belt is disposed between the first sprockets and the second sprockets. The plurality of chain belts are arranged parallel to each other, and a plurality of scraper plates are installed on the chain belts. When the first rotating shaft and the second rotating shaft are driven to rotate by the driving mechanism, the first sprockets, the second sprockets, the chain belts and the scraper plates will rotate synchronously. The scraper plates located on the lower side of the chain belts extend into the liquid surface and drive the scum towards the skimming pipe. Finally, the scum is sent into the skimming pipe.

[0012] In one possible implementation, the diameter of the second sprocket is larger than that of the first sprocket, and the first and second shafts are arranged horizontally and parallel to each other, so that the lower chain belt tilts downward toward the skimming pipe, and the scraper plate moves downward simultaneously as it moves toward the skimming pipe.

[0013] In one possible implementation, a connector is provided between the scraper and the chain belt. The connector includes a first fixed end fixedly connected to the chain belt, a second fixed end fixedly connected to the scraper, and a movable end capable of adjusting the angle, so that the scraper and the chain belt are fixedly connected and the angle between the scraper and the chain belt can be adjusted.

[0014] In one possible implementation, the movable end includes a first rotating head and a second rotating head. A through hole is provided at the center of the first rotating head and the second rotating head. A screw is inserted through the through hole. The two ends of the screw are fixedly connected by locking nuts. A first fixed end is fixed at the upper part of the first rotating head, and a second fixed end is fixed at the lower side of the second rotating head. The first fixed end is fixedly connected to the chain belt by bolts, and the second fixed end is fixedly connected to the slag scraper by bolts.

[0015] In one possible implementation, anti-slip ribs are provided on the contact surfaces of the first rotating head and the second rotating head.

[0016] In one possible implementation, the skimming pipe is provided with an inclined plate on the side facing the skimming component, the inclined plate extends into the liquid surface, the skimming pipe is provided with a slag discharge port that extends out of the tank body, and the skimming pipe is inclined downward at the end facing the slag discharge port.

[0017] In one possible implementation, the water outlet chamber is provided with an outlet and a return water inlet. The return water inlet is connected to the inlet of a pressurized water pump via a pipe, so that return water is provided in the water outlet chamber and sent into the dissolved air tank.

[0018] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention.

[0019] In this invention, different types of scum, such as oil, algae, and suspended solids, have different physical and chemical properties. By adjusting the angle of the scraper blade, these properties can be better adapted, thus improving the scraping effect.

[0020] In this invention, the lower chain belt is inclined downwards toward the skimming pipe. As the scraper moves toward the skimming pipe, it also moves downwards. The inclination angle causes the scraper to move not only horizontally but also downwards as it moves with the chain belt. As the scraper moves toward the skimming pipe, the depth into the water gradually increases, and the amount of scum carried by the scraper also gradually increases. The increasingly deeper scraper helps to reduce the amount of scum flowing out from below the scraper before it enters the skimming pipe, and it also makes the depth of the scraper match the thickness of the scum, thus reducing power consumption and equipment operating costs. Attached Figure Description

[0021] Figure 1 A three-dimensional structural diagram of a recycling sedimentation tank provided in an embodiment of this utility model;

[0022] Figure 2 A cross-sectional view of a recycling sedimentation tank provided in an embodiment of this utility model;

[0023] Figure 3 This is a schematic diagram of a scraper assembly structure for a recycling sedimentation tank provided in an embodiment of the present invention.

[0024] Figure label:

[0025] 1. Dissolved air tank; 2. Tank body; 3. Mixing chamber; 4. Stirring motor; 5. Dissolved air release device; 6. Stirring paddle; 7. Bearing seat; 8. First rotating shaft; 9. Second rotating shaft; 10. Slag scraper; 11. Second baffle; 12. Inclined plate; 13. Slag skimming pipe; 14. Water return port; 15. Water outlet; 16. Drive motor; 17. Third sprocket; 18. Fourth sprocket; 19. Second sprocket; 20. First sprocket; 21. Slag discharge pipe; 22. Slag discharge port; 23. Separation chamber; 24. Water outlet chamber; 25. First baffle; 26. Through hole; 27. Air flotation chamber; 28. Third baffle; 29. ​​Water outlet; 30. Second fixed end; 31. Second rotating head; 32. First rotating head; 33. First fixed end. Detailed Implementation

[0026] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0027] There are many methods for treating wastewater from the paper industry, each with its own unique advantages and limitations. Sedimentation is a simple method with good solid-liquid separation, suitable for treating suspended solids with a particle density greater than that of water. However, it requires a large area and takes a long time, and is not effective in removing fine particles and suspended solids with a density close to that of water.

[0028] Filtration can effectively remove suspended solids and some dissolved organic matter from wastewater, but the filter media is prone to clogging and needs to be replaced or cleaned regularly, resulting in high operating costs. Air flotation has a short processing time, requires little space, and is effective in removing fine particles and suspended solids with a density close to that of water. It also produces scum with low water content and is easy to discharge, but it consumes a lot of electricity and has high operating costs. When the concentration of suspended solids in wastewater is high, the dissolved air depressurization release device is prone to clogging, making management complex.

[0029] The wastewater from the middle stage of papermaking contains a large amount of colloidal substances, dissolved organic matter, and suspended solids, making it difficult to treat. The high concentration of suspended solids in papermaking wastewater places high demands on the load and efficiency of the treatment equipment. Generally, an air flotation machine is required for treatment. It has a small footprint, short treatment time, and is suitable for situations where large volumes of water need to be treated and rapid purification is required.

[0030] Therefore, this application proposes a recycling sedimentation tank that can quickly purify papermaking wastewater, remove scum, and at the same time reduce power consumption and equipment operating costs.

[0031] Specifically, such as Figure 1-Figure 3As shown, a recycling sedimentation tank includes a tank body 2, within which a receiving cavity is provided. A first baffle 25, a second baffle 11, and a third baffle 28 are sequentially arranged within the receiving cavity. The first baffle 25 and the first end of the receiving cavity form a mixing cavity 3. A through hole 26 communicating with a flotation cavity 27 is provided on the lower side of the first baffle 25. The receiving cavity between the first baffle 25 and the second baffle 11 forms the flotation cavity 27, and the receiving cavity between the second baffle 11 and the third baffle 28 forms a separation cavity 23. A skimming assembly is provided at the upper part of the separation cavity 23. The third partition 28 and the end of the receiving cavity form an outlet cavity 24, and the third partition 28 and the bottom of the receiving cavity have a water outlet 29. The top of the third partition 28 is provided with a skimming pipe 13. After the wastewater enters the mixing cavity 3 and mixes with the medicine, it enters the flotation cavity 27 through the through hole 26. After flotation, it enters the separation cavity 23 through the upper part of the second partition 11. After the scum floats upward, it is sent to the skimming pipe 13 by the skimming component for collection. The liquid separated from the wastewater enters the outlet cavity 24 from the water outlet 29 on the lower side of the third partition 28.

[0032] Furthermore, the tank body 2 is a rectangular cabinet formed by multiple metal plates, with an opening at the top. The rectangular cabinet forms a rectangular receiving cavity. The first partition 25 has a gap with the left side wall of the tank body 2. The cavity between the first partition 25 and the left side wall of the tank body 2 is the mixing cavity 3. Wastewater and chemical solution are sent into the mixing cavity 3 through pipes for mixing. A through hole 26 is opened on the lower side of the first partition 25. The mixed liquid enters the flotation cavity 27 through the through hole 26. A second partition 11 is set on the right side of the first partition 25. The height of the second partition 11 is set to 1 / 3 the height of the first partition 25. / 3-1 / 2, the flocs of the mixed liquid entering the flotation chamber 27 combine with microbubbles, increasing the buoyancy of the flocs. As the liquid flows from the upper part of the second baffle 11 into the separation chamber 23, the flocs with microbubbles gradually move towards the liquid surface and eventually suspend at the top. The separated liquid flows into the lower part of the separation chamber 23 and enters the outlet chamber 24 through the water outlet 29 between the third baffle 28 and the bottom of the tank body 2. The outlet chamber 24 is formed between the third baffle 28 and the right side wall of the tank body 2. The scum suspended on the liquid surface is sent into the skimming pipe 13 by the skimming component.

[0033] Furthermore, the mixing chamber 3 is equipped with a stirring assembly, a dosing pipe, and a water inlet pipe. After the medicine and wastewater enter the mixing chamber 3, they are stirred and mixed by the stirring assembly. The stirring assembly causes the medicine and wastewater in the mixing chamber to rotate and mix, so that the medicine and wastewater react fully and the impurities in the wastewater flocculate.

[0034] Specifically, a frame is installed at the top of the mixing chamber 3, and a stirring motor 4 is installed on the frame. The output shaft of the stirring motor 4 is fixed to a stirring shaft through a flange. The stirring shaft extends into the mixing chamber 3, and a stirring paddle 6 is installed on the stirring shaft. When the stirring motor 4 is powered on, the stirring motor 4 will drive the stirring shaft to rotate. The rotation of the stirring shaft will cause the medicine and wastewater in the mixing chamber 3 to form axial flow and radial flow. As wastewater and medicine are added, a portion of the mixed solution enters the air flotation chamber 27 through the lower through hole 26.

[0035] Furthermore, the bottom of the mixing chamber 3, the flotation chamber 27, the separation chamber 23, and the effluent chamber 24 are all equipped with slag discharge pipes 21, which can be used to clean away the settled waste slag.

[0036] Furthermore, a dissolved air tank 1 is provided on one side of the tank body 2. The air inlet pipe of the dissolved air tank 1 is connected to an air compressor. The air compressor provides compressed air to the dissolved air tank 1 through the air inlet pipe. The water inlet pipe of the dissolved air tank 1 is connected to a pressurized water pump. The pressurized water pump provides pressurized water to the dissolved air tank 1 through the water inlet pipe. The pressurized water and compressed air are mixed in the dissolved air tank 1 to form dissolved air water. The water outlet pipe of the dissolved air tank 1 is connected to a dissolved air release device 5. The dissolved air release device 5 is installed in the air flotation chamber 27.

[0037] An air compressor supplies compressed air to the dissolved air tank 1 through the air inlet pipe, while a pressurized water pump supplies pressurized water to the dissolved air tank 1 through the water inlet pipe. Inside the dissolved air tank 1, the pressurized water and compressed air mix to form dissolved air water. Then, the dissolved air water enters the dissolved air release device 5 through the water outlet pipe, where it releases air bubbles in the flotation chamber 27, causing suspended solids or impurities in the water to float to the surface and be removed.

[0038] Furthermore, a filter is installed between the dissolved gas tank 1 and the dissolved gas release device 5.

[0039] Specifically, in dissolved air flotation systems, commonly used filter types include copper mesh or nylon mesh filters and Y-type filters. In this application, a copper mesh filter is used with a pore size of 0.35 to -0.45 mm. The filter can trap larger particulate matter in the dissolved air water and prevent them from entering the dissolved air releaser 5, thereby avoiding performance degradation or damage to the releaser due to blockage by contaminants.

[0040] Furthermore, the skimming assembly includes a first rotating shaft 8 and a second rotating shaft 9 located at the top of the tank body 2, serving as support shafts for the sprockets and chain belts to ensure smooth operation of the chain belts. The first rotating shaft 8 is equipped with multiple first sprockets 20, and the second rotating shaft 9 is equipped with multiple second sprockets 19. A chain belt connects the first sprockets 20 and second sprockets 19, forming a continuous transmission system. Multiple chain belts are arranged parallel to each other to ensure that the scraper blades 10 can cover the entire width of the tank body 2. Multiple scraper blades 10 are mounted on the chain belts and driven by a mechanism. When the first rotating shaft 8 and the second rotating shaft 9 are driven to rotate, the first sprocket 20, the second sprocket 19, the chain belt, and the scraper 10 will rotate synchronously. The scraper 10, located on the lower side of the chain belt, extends into the liquid surface and moves the scum towards the skimming pipe 13. During the movement, the scraper 10 will scrape off the scum on the water surface and carry it towards the skimming pipe 13. The skimming pipe 13 is set on the top side of the pool body 2 and is used to collect and discharge the scum. Finally, the scum is sent into the skimming pipe 13. This process will be repeated until the scum on the water surface is completely removed or the predetermined treatment effect is achieved.

[0041] Specifically, four bearing seats 7 are installed on the top of the pool body 2. The first rotating shaft 8 and the second rotating shaft 9 are rotatably connected to the pool body 2 through the bearing seats 7. A drive motor 16 is installed on the top of the pool body 2 through a frame. A third sprocket 17 is installed on the output shaft of the drive motor 16. A fourth sprocket 18 is installed at the end of the second rotating shaft 9. The third sprocket 17 and the fourth sprocket 18 are connected by a chain. When the drive motor 16 is powered on, it can drive the third sprocket 17 to rotate. The third sprocket 17 can then drive the fourth sprocket 18 to rotate through the chain. The fourth sprocket 18 can drive the second rotating shaft 9 to rotate. The rotation of the second rotating shaft 9 will drive the second sprocket 19 to rotate. The second sprocket 19 will drive the first sprocket 20 to rotate through the chain, thereby driving the first rotating shaft 8 to rotate.

[0042] Furthermore, the diameter of the second sprocket 19 is larger than that of the first sprocket 20, and the first shaft 8 and the second shaft 9 are arranged horizontally and parallel to each other, so that the lower chain belt is inclined downward toward the skimming pipe 13. As the scraper plate 10 moves toward the skimming pipe 13, it also moves downward. The inclination angle makes the scraper plate 10 not only move horizontally as it moves with the chain belt, but also has a downward component. As the scraper plate 10 moves toward the skimming pipe 13, the depth into the water gradually increases, and the amount of scum carried by the scraper plate 10 also gradually increases during the movement. The gradually deeper scraper plate 10 helps to reduce the amount of scum flowing out from below the scraper plate 10 before it is scraped into the skimming pipe 13, and makes the depth of the scraper plate 10 match the thickness of the scum, reducing power consumption and reducing equipment operating costs.

[0043] Specifically, the tilt angle between the lower chain and the liquid surface is set to 15°.

[0044] Furthermore, a connector is provided between the scraper plate 10 and the chain belt. The connector includes a first fixed end 33 fixedly connected to the chain belt, a second fixed end 30 fixedly connected to the scraper plate 10, and a movable end capable of adjusting the angle. This allows the scraper plate 10 to be fixedly connected to the chain belt while also allowing for adjustment of the angle between the scraper plate 10 and the chain belt. Different types of scum, such as oil, algae, and suspended solids, have different physical and chemical properties. By adjusting the angle of the scraper plate 10, these properties can be better adapted, improving the scraping effect.

[0045] Specifically, when the scum is mainly composed of grease or similar substances, adjusting the scraper 10 to form an acute angle with the liquid surface and with its opening facing the skimming pipe 13 can help reduce the contact area between the scraper 10 and the grease, thereby reducing energy consumption and improving scraping efficiency. When the scum is mainly composed of suspended solids, adjusting the scraper 10 to form a right angle with the liquid surface can ensure that the scraper 10 has sufficient contact area with the suspended solids, so that the scum will not flow out from the underside of the scraper 10 during the scraping process.

[0046] Specifically, in this application, the scraper 10 is set in a vertical position. When the chain belt rotates to the lower side, the scraper 10 extends vertically into the liquid surface, and the scraper 10 is set at 90° with the liquid surface.

[0047] Furthermore, the movable end includes a first rotating head 32 and a second rotating head 31. A through hole 26 is provided at the center of the first rotating head 32 and the second rotating head 31. A screw is inserted through the through hole 26. The two ends of the screw are fixedly connected by locking nuts. A first fixed end 33 is fixed to the upper part of the first rotating head 32, and a second fixed end 30 is fixed to the lower side of the second rotating head 31. The first fixed end 33 is fixedly connected to the chain belt by bolts, and the second fixed end 30 is fixedly connected to the scraper plate 10 by bolts.

[0048] Furthermore, anti-slip ribs are provided on the contact surfaces of the first rotating head 32 and the second rotating head 31. When the bolt and the locking nut are fixed, the anti-slip ribs of the first rotating head 32 and the second rotating head 31 are interlocked, so that the first rotating head 32 and the second rotating head 31 cannot rotate relative to each other.

[0049] Furthermore, the skimming pipe 13 is provided with an inclined plate 12 on the side facing the skimming component. The inclined plate 12 extends into the liquid surface. The skimming pipe 13 is provided with a slag discharge port 22 that extends out of the tank body 2. The skimming pipe 13 is inclined downward at the end facing the slag discharge port 22. The slag sent into the skimming pipe 13 by the skimming component is discharged from the slag discharge port 22.

[0050] Furthermore, the water outlet chamber 24 is provided with an outlet 15 and a return water inlet 14. The return water inlet 14 is connected to the inlet of the pressurized water pump through a pipe, so that return water is provided in the water outlet chamber 24 and sent into the dissolved air tank 1, thereby improving the water utilization efficiency and realizing the recycling of water resources through return water and pressurization.

[0051] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. In the absence of conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A recycling sedimentation tank, characterized in that, The tank includes a containment cavity, within which a first baffle, a second baffle, and a third baffle are sequentially arranged. The first baffle and the first end of the containment cavity form a mixing cavity. A through hole communicating with a flotation cavity is provided on the lower side of the first baffle. The containment cavity between the first and second baffles forms a flotation cavity, and the containment cavity between the second and third baffles forms a separation cavity. A skimming assembly is provided at the upper part of the separation cavity. The third baffle and the end of the containment cavity form an outlet cavity, and a water outlet is provided at the bottom of the containment cavity and the top of the third baffle... The tank is equipped with a skimming pipe. The skimming assembly includes a first rotating shaft and a second rotating shaft located at the top of the tank. The first rotating shaft is equipped with multiple first sprockets, and the second rotating shaft is equipped with multiple second sprockets. A chain is provided between the first and second sprockets. The multiple chain belts are arranged parallel to each other, and multiple scraper plates are installed on the chain belts. The diameter of the second sprockets is larger than that of the first sprockets. The first and second rotating shafts are arranged horizontally and parallel to each other, so that the lower chain belt is inclined downward toward the skimming pipe. The scraper plates move downward simultaneously as they move toward the skimming pipe.

2. The recycling sedimentation tank according to claim 1, characterized in that, The mixing chamber is equipped with a stirring assembly, a dosing pipe, and a water inlet pipe. After the medicine and wastewater enter the mixing chamber, they are stirred and mixed by the stirring assembly.

3. A recycling sedimentation tank according to claim 1, characterized in that, A dissolved air tank is installed on one side of the pool. The air inlet pipe of the dissolved air tank is connected to an air compressor, which supplies compressed air into the dissolved air tank through the air inlet pipe. The water inlet pipe of the dissolved air tank is connected to a pressurized water pump, which supplies pressurized water into the dissolved air tank through the water inlet pipe. The pressurized water and compressed air mix in the dissolved air tank to form dissolved air water. The water outlet pipe of the dissolved air tank is connected to a dissolved air release device, which is installed in the air flotation chamber.

4. A recycling sedimentation tank according to claim 1, characterized in that, A connector is provided between the scraper and the chain belt. The connector includes a first fixed end that is fixedly connected to the chain belt, a second fixed end that is fixedly connected to the scraper, and a movable end that can adjust the angle, so that the scraper and the chain belt are fixedly connected and the angle between the scraper and the chain belt can be adjusted.

5. A recycling sedimentation tank according to claim 4, characterized in that, The movable end includes a first rotating head and a second rotating head. A through hole is opened at the center of the first rotating head and the second rotating head. A screw is inserted through the through hole. The two ends of the screw are fixedly connected by locking nuts. A first fixed end is fixed at the upper part of the first rotating head, and a second fixed end is fixed at the lower side of the second rotating head. The first fixed end is fixedly connected to the chain belt by bolts, and the second fixed end is fixedly connected to the slag scraper by bolts.

6. A recycling sedimentation tank according to claim 5, characterized in that, Anti-slip ribs are provided on the contact surfaces of the first rotating head and the second rotating head.

7. A recycling sedimentation tank according to claim 1, characterized in that, The skimming pipe is provided with an inclined plate on the side facing the skimming component. The inclined plate extends into the liquid surface. The skimming pipe is provided with a slag discharge port that extends out of the tank body, and the skimming pipe is inclined downward at the slag discharge port end.

8. A recycling sedimentation tank according to claim 1, characterized in that, The water outlet chamber is equipped with an outlet and a return water inlet. The return water inlet is connected to the inlet of the pressurized water pump through a pipe, so that return water is provided in the water outlet chamber and sent into the dissolved air tank.

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