A circulating water treatment system and method for a high-density sedimentation tank

Abstract

This invention relates to the field of wastewater treatment technology, and in particular to a circulating water treatment system and method for a high-density sedimentation tank. The system includes a tank body with a top plate fixedly installed on its upper surface. A mixing zone and an inclined tube sedimentation zone are respectively arranged at the front and rear of the inner side of the tank body. A guide tube is fixedly installed between the mixing zone and the inclined tube sedimentation zone. A drive shaft is installed on the inner side of the guide tube via a drive mechanism. A guide vane is fixedly installed at the lower end of the drive shaft. A defoaming disc is fixedly sleeved on the outer surface of the drive shaft, near the top of the guide tube. This invention achieves efficient defoaming and flow stabilization through rotating defoaming ribs and a lower arched surface, preventing sludge from floating. Simultaneously, it automatically switches the rotation state of the defoaming ribs based on changes in liquid level, performing synchronous defoaming during normal operation and automatic relative rotation for self-cleaning during maintenance. This significantly improves sedimentation efficiency and reduces maintenance difficulty.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a circulating water treatment system and method for a high-density sedimentation tank. Background Technology

[0002] In the field of wastewater treatment, high-density sedimentation tanks are widely used in municipal sewage and industrial wastewater treatment. However, existing systems still have drawbacks when treating wastewater with high foam, high fiber, and high organic load, such as that from fruit and vegetable processing and food brewing.

[0003] In the core design of current high-density sedimentation tanks, after the water flows through the guide tube and is agitated at high speed, it carries a large number of tiny bubbles upwards. These bubbles combine with surfactants such as saponins and proteins in the wastewater to form stable and highly viscous foam.

[0004] Existing technologies typically only install a simple flat-plate rectifying disc at the outlet of the guide tube. Its function is to convert vertical water flow into horizontal water distribution, lacking a targeted defoaming mechanism and affecting the downward turbulence of wastewater. With prolonged use, the polysaccharides, proteins, and other viscous organic matter in the wastewater will quickly form a biofilm on the surface of the disc and ribs. This biofilm not only significantly increases the surface roughness of the disc, making it more difficult for bubbles to break up, but also causes microbubbles to directly enter the inclined tube sedimentation zone with the water flow. These microbubbles will then adhere to the sludge flocs, creating an air flotation effect, preventing the sludge from settling properly. Ultimately, the sludge will overflow with the effluent, severely damaging the effluent quality.

[0005] To address this issue, some processes have attempted to add foam baffles or spray devices before the effluent weir. However, these end-of-pipe treatment methods can only intercept surface foam and cannot solve the problem of tiny air bubbles carried within the water flow. Therefore, a circulating water treatment system and method using a high-density sedimentation tank are proposed. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of the prior art by proposing a circulating water treatment system and method for a high-density sedimentation tank.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a circulating water treatment system for a high-density sedimentation tank, comprising a tank body, a top plate fixedly installed on the upper surface of the tank body, a mixing zone and an inclined tube sedimentation zone respectively arranged at the front and rear of the inner side of the tank body, a guide tube fixedly installed between the mixing zone and the inclined tube sedimentation zone, a drive shaft installed on the inner side of the guide tube through a drive mechanism, a guide vane fixedly installed at the lower end of the drive shaft, a defoaming disc fixedly sleeved on the outer surface of the drive shaft and near the upper part of the guide tube, a plurality of defoaming ribs slidably sleeved on the outer surface of the defoaming disc, a sleeve fixedly installed at the upper end of the plurality of defoaming ribs, a suspension sleeve slidably connected to the upper surface of the sleeve along the vertical direction, a locking mechanism provided between the upper end of the suspension sleeve and the top plate, and a spline mechanism provided between the outer surface of the drive shaft and the inner wall of the suspension sleeve;

[0008] The lower surface of the defoaming plate has an arched surface that guides the water flow from the upper end of the guide tube to flare outwards;

[0009] The suspension sleeve floats up due to the buoyancy of the sewage, the spline mechanism engages, the locking mechanism unlocks, the drive shaft rotates synchronously with the suspension sleeve, and the defoaming disc and defoaming ribs rotate synchronously to defoam;

[0010] After the sewage is discharged, the suspension sleeve falls under the action of gravity, the spline mechanism disengages, and the suspension sleeve is locked by the locking mechanism when the drive shaft rotates. When the defoaming disc rotates, the defoaming ribs remain relatively stationary to clean the surface of the defoaming disc.

[0011] Preferably, the mixing zone includes a partition plate fixedly installed on the pool body and near the front end, a water inlet pipe is provided on the front surface of the pool body, and a stirring mechanism is provided on the inner side of the pool body and in front of the partition plate.

[0012] Preferably, the inclined tube sedimentation zone includes an inclined tube mechanism fixedly installed on the upper side of the tank body. Several outlet weirs are fixedly installed on the upper surface of the inclined tube mechanism. A flow-gathering channel is fixedly connected between the outlet weirs on both sides. A flow-guiding channel is fixedly provided on the rear surface of the tank body. The rear end of the flow-gathering channel is connected to the flow-guiding channel. A drain pipe is connected to the rear surface of the flow-guiding channel. A sludge scraping mechanism is provided at the rear end of the inner side of the tank body. A sludge hopper is provided on the inner bottom surface of the tank body. A sludge pumping pipe is connected to one side of the lower surface of the sludge hopper. A sludge pumping unit is provided at one end of the sludge pumping pipe. An overflow channel is provided on the inner side of the tank body near the front of the inclined tube mechanism.

[0013] Preferably, two T-shaped rods are fixedly connected to the lower surface of the suspension sleeve, and a sliding cavity is formed on the upper surface of the sleeve, with the T-shaped rods slidably inserted into the inner side of the sliding cavity.

[0014] Preferably, the upper surface of the defoaming disc is provided with a bucket-shaped surface, and the outer edge of the defoaming disc is provided with a side curved edge.

[0015] Preferably, the defoaming rib includes an inclined strip, an arc-shaped strip, and a curved strip connected sequentially at their ends. The lower edge of the inclined strip slides against the bucket-shaped surface, the arc-shaped strip slides against the side curved edge, and the curved strip slides against the lower arched surface.

[0016] Preferably, the locking mechanism includes a protrusion on the upper surface of the top plate, the protrusion having a cylindrical cavity inside, a lower limiting tooth fixedly installed on the inner bottom surface of the cylindrical cavity, a connecting cylinder fixedly connected to the upper surface of the suspension sleeve, the upper end of the connecting cylinder being slidably inserted into the inner side of the cylindrical cavity, and an upper limiting tooth fixedly sleeved on the upper end of the connecting cylinder.

[0017] Preferably, the spline mechanism includes several pointed cones fixedly protruding on the outer surface of the drive shaft, and the pointed cones are arranged in an equidistant annular array. The interior of the suspension sleeve is fixedly connected with several limiting blocks arranged in an annular array. The upper surface of the limiting blocks is provided with symmetrical top guide surfaces, and each pointed cone is slidably inserted between two limiting blocks.

[0018] Preferably, the driving mechanism includes a mounting base fixedly installed on the upper surface of the top plate, a drive motor fixedly installed at the rear end of the mounting base, the output shaft of the drive motor fixedly connected to the upper end of the drive shaft, the drive shaft rotating through the lower surface of the top plate, and a mounting bracket fixedly sleeved on the outer surface of the guide tube, the mounting bracket being fixedly installed on the inner wall of the pool.

[0019] A method for treating circulating water in a high-density sedimentation tank, using the above-mentioned treatment system, includes the following steps:

[0020] S1. A coagulant injection pipeline is arranged above the mixing zone, and a return sludge pipeline is connected below the mixing zone. The return sludge pipeline is connected to the inclined tube sedimentation zone. At the same time, a flocculant injection pipeline is arranged above the guide tube.

[0021] S2. Wastewater enters the tank, and the flow rate is controlled to keep the wastewater level above the suspension sleeve.

[0022] S3. During wastewater treatment, coagulant is continuously added to the mixing zone while sludge is returned, and colloidal particles in the wastewater are initially destabilized.

[0023] S4. After the water flows through the mixing zone into the guide tube, flocculant is continuously added. The guide tube is stirred at medium speed by the guide vanes, causing the destabilized particles to collide and aggregate, forming dense flocs with good settling properties. The water flows out from the top of the guide tube carrying the flocs.

[0024] S5. After the water is evenly distributed, it enters the inclined tube sedimentation zone. The flocs quickly settle to the bottom of the tank under the action of gravity, while the clear water rises and is discharged.

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

[0026] 1. In this invention, when water flows through the defoaming plate, the defoaming ribs use rotational shearing force in conjunction with the water flow to powerfully break up the air-containing water flow overflowing from the guide tube. The defoaming ribs not only increase the contact area between the bubbles and the defoaming plate, promoting the collision, fusion and breakup of the bubbles, but also change the direction of water flow, eliminate the vertical kinetic energy of the water flow, effectively prevent the bubbles from carrying sludge to float, and significantly improve the sedimentation efficiency.

[0027] 2. In this invention, when the water carrying flocs overflows from the top of the guide tube, it is guided by the lower arch surface, causing the water to flow outward and downward, achieving a good guiding effect. The defoaming process does not hinder normal flow.

[0028] 3. In this invention, as the liquid level of the wastewater changes, the synchronous rotation state of the defoaming ribs and the defoaming disc can be automatically changed. That is, during wastewater treatment, the two rotate synchronously to ensure the defoaming function. During regular maintenance, the two rotate relative to each other to achieve the self-cleaning effect of the defoaming disc surface, which greatly improves the efficiency of later maintenance and reduces the difficulty of maintenance. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the circulating water treatment system of a high-density sedimentation tank according to the present invention;

[0030] Figure 2 This is a cross-sectional view of a circulating water treatment system for a high-density sedimentation tank according to the present invention.

[0031] Figure 3 This is a cross-sectional view of the guide tube of a circulating water treatment system for a high-density sedimentation tank according to the present invention.

[0032] Figure 4 This is a cross-sectional view of the defoaming disc in the circulating water treatment system of a high-density sedimentation tank according to the present invention.

[0033] Figure 5 This invention relates to a circulating water treatment system for a high-density sedimentation tank. Figure 4 Enlarged view of point A in the middle;

[0034] Figure 6 This is a cross-sectional view of the sleeve section of a circulating water treatment system for a high-density sedimentation tank according to the present invention.

[0035] Figure 7 This invention relates to a circulating water treatment system for a high-density sedimentation tank. Figure 6 Enlarged view at point B in the middle;

[0036] Figure 8 This is a schematic diagram of the suspension sleeve of a circulating water treatment system for a high-density sedimentation tank according to the present invention.

[0037] Figure 9 This is a partial cross-sectional view of the suspended sleeve descending in the circulating water treatment system of a high-density sedimentation tank according to the present invention.

[0038] Figure 10 This invention relates to a circulating water treatment system for a high-density sedimentation tank. Figure 9 Enlarged view of point C in the middle.

[0039] The components include: 1. Pool body; 2. Inlet pipe; 3. Partition plate; 4. Overflow channel; 5. Mounting bracket; 6. Flow guide tube; 7. Defoaming disc; 71. Lower arched surface; 72. Side curved edge; 73. Bucket-shaped surface; 8. Defoaming ribs; 81. Curved strip; 82. Arc-shaped strip; 83. Inclined strip; 9. Drive shaft; 10. Drainage vane; 11. Top plate; 12. Mounting base; 13. Drive motor; 14. Protrusion; 15. Cylindrical cavity; 16. 17. Suspension sleeve; 18. Connecting cylinder; 19. Upper limit tooth; 20. Lower limit tooth; 21. Conical block; 22. Limiting block; 23. Top guide surface; 24. T-shaped rod; 25. Sleeve; 26. Sliding cavity; 27. Stirring mechanism; 28. Sludge scraping mechanism; 29. ​​Sludge hopper; 30. Sludge pumping pipe; 31. Sludge pumping unit; 32. Inclined pipe mechanism; 33. Water outlet weir; 34. Flow channel; 35. Flow guide groove; 36. Drainage pipe. Detailed Implementation

[0040] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0041] like Figures 1-10 The circulating water treatment system of a high-density sedimentation tank shown includes a tank body 1. A top plate 11 is fixedly installed on the upper surface of the tank body 1. A mixing zone and an inclined tube sedimentation zone are respectively arranged in front and behind the inner side of the tank body 1. A guide tube 6 is fixedly installed between the mixing zone and the inclined tube sedimentation zone. A drive shaft 9 is installed on the inner side of the guide tube 6 through a drive mechanism. A guide vane 10 is fixedly installed at the lower end of the drive shaft 9. A defoaming disc 7 is fixedly sleeved on the outer surface of the drive shaft 9 and near the upper part of the guide tube 6. A plurality of defoaming ribs 8 are slidably sleeved on the outer surface of the defoaming disc 7. A sleeve 24 is fixedly installed at the upper end of the plurality of defoaming ribs 8. A suspension sleeve 16 is slidably connected to the upper surface of the sleeve 24 along the vertical direction. A locking mechanism is provided between the upper end of the suspension sleeve 16 and the top plate 11. A spline mechanism is provided between the outer surface of the drive shaft 9 and the inner wall of the suspension sleeve 16.

[0042] The lower surface of the defoaming plate 7 is provided with a lower arched surface 71 that guides the water flow from the upper end of the guide tube 6 outwards;

[0043] Suspension sleeve 16 floats to the surface due to the buoyancy of sewage, the spline mechanism engages, and the locking mechanism unlocks. The state at this point is as follows: Figure 4 , Figure 5 As shown, the drive shaft 9 rotates synchronously with the suspension sleeve 16, and the defoaming disc 7 rotates synchronously with the defoaming rib 8 to perform defoaming.

[0044] After the sewage is discharged, the suspension sleeve 16 falls under the influence of gravity, and the spline mechanism disengages. At this time, the state is as follows: Figure 9 , Figure 10 As shown, when the drive shaft 9 rotates, the suspension sleeve 16 is locked by the locking mechanism, and when the defoaming disc 7 rotates, the defoaming ribs 8 remain relatively stationary to clean the surface of the defoaming disc 7.

[0045] like Figure 2 As shown, the mixing zone includes a partition plate 3 fixedly installed on the tank body 1 near the front end. A water inlet pipe 2 is provided on the front surface of the tank body 1, and a stirring mechanism 26 is provided on the inner side of the tank body 1 near the front of the partition plate 3. There is a gap between the bottom of the partition plate 3 and the inner bottom surface of the tank body 1 to ensure that the water flow can reach the rear. The stirring mechanism 26 is a common existing technology used to mix the added coagulant, the returned sludge, and the sewage.

[0046] like Figure 2 As shown, the inclined tube sedimentation zone includes an inclined tube mechanism 31 fixedly installed on the upper inner side of the tank body 1. The inclined tube mechanism 31 is a prior art technology, with a large number of inclined tubular packing materials, which greatly increases the sedimentation area, allowing the sludge flocs in the water to quickly settle to the bottom of the tank under gravity, while the clear water flows upward. Several outlet weirs 32 are fixedly installed on the upper surface of the inclined tube mechanism 31. The outlet weirs 32 are used to control the water level and evenly collect the clear water above the inclined tube mechanism 31. A flow-gathering channel 33 is fixedly connected between the two outlet weirs 32. A flow guide trough 34 is fixedly installed on the rear surface of the tank body 1. The rear end of the flow-gathering channel 33 is connected to the flow guide trough 34. A drain pipe 35 is connected to the rear surface of the flow guide trough 34. A sludge scraping mechanism 27 is installed at the inner rear end of the tank body 1. The inner bottom surface of the tank body 1 A sludge collection hopper 28 is provided, and a sludge scraping mechanism 27 is responsible for scraping and pushing the sludge that cannot slide into the sludge collection hopper 28 from the bottom of the pool into the sludge collection hopper 28 to prevent the sludge from accumulating on the bottom panel of the pool body 1. A sludge suction pipe 29 is connected to one side of the lower surface of the sludge collection hopper 28. A sludge suction pump group 30 is provided at one end of the sludge suction pipe 29. The sludge suction pump group 30 extracts the high-concentration sludge from the sludge collection hopper 28 through the sludge suction pipe 29. Part of it is sent back to the front mixing zone as return sludge, and the other part is discharged as surplus sludge for dewatering treatment. In later use, one end of the three-way pipe is connected to the bottom of the mixing zone, and the other end is used to discharge part of the sludge. An overflow channel 4 is provided on the inner side of the pool body 1 and near the front of the inclined tube mechanism 31. The overflow channel 4 forms a water level buffer to prevent the water flow from directly impacting the settled sludge and the settled sludge at the inclined tube mechanism 31.

[0047] like Figure 6 , Figure 7 , Figure 8 As shown, two T-shaped rods 23 are fixedly connected to the lower surface of the suspension sleeve 16, and a sliding cavity 25 is formed on the upper surface of the sleeve 24. The T-shaped rods 23 are slidably inserted into the inner side of the sliding cavity 25. When the suspension sleeve 16 slides up and down, the T-shaped rods 23 move relative to the inner side of the sliding cavity 25.

[0048] like Figure 3 , Figure 4 As shown, the upper surface of the defoaming disc 7 is provided with a funnel-shaped surface 73, and the outer edge of the defoaming disc 7 is provided with a side curved edge 72. The funnel-shaped surface 73 can help the impurities accumulated on the surface to flow away to the surroundings, and the surface of the side curved edge 72 is smooth, which can minimize the adhesion of impurities.

[0049] like Figure 3 , Figure 4 As shown, the defoaming ribs 8 need to be adapted to the surface shape of the defoaming disc 7. The defoaming ribs 8 include an inclined rib 83, an arc-shaped rib 82, and a curved rib 81 connected sequentially at their ends. The lower edge of the inclined rib 83 slides against the funnel-shaped surface 73, the arc-shaped rib 82 slides against the side curved edge 72, and the curved rib 81 slides against the lower arched surface 71. Figure 3 As shown, the defoaming ribs 8 are radially offset from the drive shaft 9. Their roots are not completely aligned with the central axis of the drive shaft 9, but are kept at a distance from the central axis and are arranged in an eccentric radial pattern to ensure that they can help impurities be pushed and accumulated towards the surrounding area.

[0050] like Figure 4 , Figure 5 , Figure 6 As shown, the locking mechanism includes a protrusion 14 on the upper surface of the top plate 11. A cylindrical cavity 15 is formed inside the protrusion 14. A lower limiting tooth 19 is fixedly installed on the inner bottom surface of the cylindrical cavity 15. A connecting cylinder 17 is fixedly connected to the upper surface of the suspension sleeve 16. The upper end of the connecting cylinder 17 is slidably inserted into the inner side of the cylindrical cavity 15, and an upper limiting tooth 18 is fixedly sleeved on the upper end of the connecting cylinder 17. Figure 9 , Figure 10 As shown, when the connecting cylinder 17 moves down, the upper limit tooth 18 engages with the lower limit tooth 19, thus achieving the locking state.

[0051] like Figure 7 , Figure 8As shown, the spline mechanism includes several pointed cone blocks 20 fixedly protruding from the outer surface of the drive shaft 9, arranged in an equidistant circular array. Several limiting blocks 21 arranged in a circular array are fixedly connected inside the suspension sleeve 16. The upper surface of each limiting block 21 has a symmetrical top guide surface 22. Each pointed cone block 20 slides between two limiting blocks 21. The top guide surface 22 allows for pushing movement when in contact with the lower end of the pointed cone block 20, ensuring that the pointed cone block 20 can be inserted between two adjacent limiting blocks 21. The suspension sleeve 16 can be made of ultra-high molecular weight polyethylene to ensure upward movement under buoyancy. To increase buoyancy and improve movement, it is preferably composed of a stainless steel thin shell and a polystyrene foam core. The strength is ensured by the stainless steel, and the buoyancy is ensured by the internal foam.

[0052] like Figure 2 , Figure 3 As shown, the drive mechanism includes a mounting base 12 fixedly mounted on the upper surface of the top plate 11. A drive motor 13 is fixedly mounted on the rear end of the mounting base 12. The output shaft of the drive motor 13 is fixedly connected to the upper end of the drive shaft 9. The drive shaft 9 rotates through the lower surface of the top plate 11. A mounting bracket 5 is fixedly sleeved on the outer surface of the guide tube 6. The mounting bracket 5 is fixedly mounted on the inner wall of the pool body 1. The operation of the drive motor 13 causes the drive shaft 9 to rotate, which in turn causes the guide vane 10 to rotate, drawing water upward from below.

[0053] A circulating water treatment method for a high-density sedimentation tank is also proposed, which uses the above-mentioned treatment system and includes the following steps:

[0054] S1. A coagulant injection pipeline is arranged above the mixing zone, and a return sludge pipeline is connected below the mixing zone. The return sludge pipeline is connected to the inclined tube sedimentation zone. At the same time, a flocculant injection pipeline is arranged above the guide tube 6.

[0055] S2. Wastewater enters tank 1, and the flow rate is controlled to keep the wastewater height above the suspended sleeve 16.

[0056] S3. During wastewater treatment, coagulant is continuously added to the mixing zone while sludge is returned, and colloidal particles in the wastewater are initially destabilized.

[0057] S4. After the water flows through the mixing zone into the guide tube 6, flocculant is continuously added. The guide vanes 10 inside the guide tube 6 are used for medium-speed stirring, so that the destabilized particles collide and aggregate with each other to form dense flocs with good settling properties. The water flow carries the flocs and overflows from the top of the guide tube 6.

[0058] S5. After the water is evenly distributed, it enters the inclined tube sedimentation zone. The flocs quickly settle to the bottom of the tank 1 under the action of gravity, while the clear water rises and flows away.

[0059] In practical use, water flows into the guide tube 6, and flocculant is continuously added. The guide vanes 10 inside the guide tube 6 are used for medium-speed stirring, causing the destabilized particles to collide and aggregate, forming dense flocs with good settling properties. The water flow carries the flocs and overflows from the top of the guide tube 6. Guided by the lower arch surface 71, the water flow is directed outward and downward, achieving a good guiding effect. The defoaming process does not hinder normal flow. When the water flows through, the defoaming ribs 8 use rotational shear force in conjunction with the water flow to powerfully break up the air-containing water flow overflowing from the guide tube 6. The defoaming ribs 8 not only increase the contact area between the bubbles and the defoaming disc 7, promoting the collision, fusion, and breakage of the bubbles, but also change the direction of the water flow, eliminating the vertical kinetic energy of the water flow, effectively preventing the bubbles from carrying sludge to the surface, and significantly improving the sedimentation efficiency.

[0060] After being evenly distributed, the water flows into the inclined tube sedimentation zone. Under the action of gravity, the flocs quickly settle to the bottom of the tank 1 along the inner wall of the inclined tube mechanism 31, while the clear water gathers upward. The supernatant overflows through the outlet weir 32, flows through the flow collection channel 33, and then reaches the guide channel 34. Finally, it is discharged through the drain pipe 35. The sludge scraping mechanism 27 rotates to collect the sludge that has settled at the bottom. The sludge pump group 30 sucks up the sludge. A portion of the sludge is returned to the mixing zone, and the other portion is discharged periodically as surplus sludge to maintain a stable sludge concentration in the tank 1.

[0061] When the sewage overflows the suspension sleeve 16, the top guide surface 22 contacts the lower end of the cone block 20. At this time, the upper limit tooth 18 and the lower limit tooth 19 at the top separate from each other, and the suspension sleeve 16 can rotate relative to each other, ensuring that the cone block 20 can push the top guide surface 22 and thus insert between two adjacent limit blocks 21. In this state, the suspension sleeve 16 will rotate synchronously with the drive shaft 9, that is, the defoaming rib 8 and the defoaming disc 7 will rotate synchronously, ensuring the normal progress of the defoaming process.

[0062] During subsequent maintenance, when the sewage level drops, the suspended sleeve 16 moves downward under the influence of gravity, and the upper limit tooth 18 meshes with the lower limit tooth 19, achieving a jamming effect. At this time, the suspended sleeve 16 will not be able to rotate. When the drive shaft 9 rotates, the defoaming disc 7 rotates, and the defoaming ribs 8 remain relatively stationary, scraping away the accumulated impurities on the surface of the defoaming disc 7. Because there is a radial offset between the defoaming ribs 8 and the drive shaft 9, their roots are not completely aligned with the central axis of the drive shaft 9, but maintain a distance from the central axis, arranged in an eccentric radial pattern. Therefore, it can help push the impurities towards the surrounding area to accumulate. During the later sewage treatment, the accumulated impurities can be easily thrown away by the water flow impact and rotation, making the maintenance process convenient and preventing the defoaming and water distribution capabilities from being affected by the accumulated impurities.

[0063] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A circulating water treatment system for a high-density sedimentation tank, comprising a tank body (1), characterized in that: A top plate (11) is fixedly installed on the upper surface of the pool body (1). A mixing zone and an inclined tube sedimentation zone are respectively set in front and behind the inner side of the pool body (1). A guide tube (6) is fixedly installed between the mixing zone and the inclined tube sedimentation zone. A drive shaft (9) is installed on the inner side of the guide tube (6) through a drive mechanism. A guide vane (10) is fixedly installed at the lower end of the drive shaft (9). A defoaming disc (7) is fixedly sleeved on the outer surface of the drive shaft (9) and above the guide tube (6). Several defoaming ribs (8) are slidably sleeved on the outer surface of the defoaming disc (7). A sleeve (24) is fixedly installed on the upper end of several defoaming ribs (8). A suspension sleeve (16) is slidably connected on the upper surface of the sleeve (24) along the vertical direction. A locking mechanism is provided between the upper end of the suspension sleeve (16) and the top plate (11). A spline mechanism is provided between the outer surface of the drive shaft (9) and the inner wall of the suspension sleeve (16). The lower surface of the defoaming plate (7) is provided with a lower arched surface (71) that guides the water flow from the upper end of the guide tube (6) toward the outer side. The suspension sleeve (16) floats up due to the buoyancy of the sewage, the spline mechanism engages, the locking mechanism unlocks, the drive shaft (9) rotates synchronously with the suspension sleeve (16), and the defoaming disc (7) and the defoaming rib (8) rotate synchronously to defoam; After the sewage is discharged, the suspension sleeve (16) falls due to gravity, the spline mechanism disengages, and the suspension sleeve (16) is locked by the locking mechanism when the drive shaft (9) rotates. When the defoaming disc (7) rotates, the defoaming ribs (8) remain relatively stationary to clean the surface of the defoaming disc (7). Two T-shaped rods (23) are fixedly connected to the lower surface of the suspension sleeve (16), and a sliding cavity (25) is opened on the upper surface of the sleeve (24). The T-shaped rods (23) are slidably inserted into the inner side of the sliding cavity (25). The upper surface of the defoaming plate (7) is provided with a funnel-shaped surface (73), and the outer edge of the defoaming plate (7) is provided with a side curved edge (72). The defoaming rib (8) includes an inclined rib (83), an arc-shaped rib (82) and a curved rib (81) connected in sequence at the ends. The lower edge of the inclined rib (83) slides against the bucket-shaped surface (73), the arc-shaped rib (82) slides against the side curved edge (72), and the curved rib (81) slides against the lower arch surface (71). The locking mechanism includes a protrusion (14) on the upper surface of the top plate (11), a cylindrical cavity (15) is provided inside the protrusion (14), a lower limiting tooth (19) is fixedly installed on the inner bottom surface of the cylindrical cavity (15), a connecting cylinder (17) is fixedly connected to the upper surface of the suspension sleeve (16), the upper end of the connecting cylinder (17) is slidably inserted into the inner side of the cylindrical cavity (15), and an upper limiting tooth (18) is fixedly sleeved on the upper end of the connecting cylinder (17). When the connecting cylinder (17) moves down, the upper limiting tooth (18) meshes with the lower limiting tooth (19) to achieve a locking state. The spline mechanism includes several pointed cone blocks (20) fixedly protruding on the outer surface of the drive shaft (9), and the pointed cone blocks (20) are arranged in an equidistant ring array. The interior of the suspension sleeve (16) is fixedly connected with several limiting blocks (21) arranged in a ring array. The upper surface of the limiting block (21) is provided with a symmetrical top guide surface (22), and each pointed cone block (20) is slidably inserted between two limiting blocks (21).

2. The circulating water treatment system for a high-density sedimentation tank according to claim 1, characterized in that: The mixing zone includes a partition plate (3) fixedly installed on the pool body (1) and near the front end. A water inlet pipe (2) is provided on the front surface of the pool body (1). A stirring mechanism (26) is provided on the inner side of the pool body (1) and in front of the partition plate (3).

3. The circulating water treatment system for a high-density sedimentation tank according to claim 1, characterized in that: The inclined tube sedimentation zone includes an inclined tube mechanism (31) fixedly installed on the upper inner side of the pool body (1). Several outlet weirs (32) are fixedly installed on the upper surface of the inclined tube mechanism (31). A flow collection channel (33) is fixedly connected between the outlet weirs (32) on both sides. A flow guide channel (34) is fixedly provided on the rear surface of the pool body (1). The rear end of the flow collection channel (33) is connected to the flow guide channel (34). A drain pipe (35) is connected to the rear surface of the flow guide channel (34). A sludge scraping mechanism (27) is provided at the rear inner side of the pool body (1). A sludge collection hopper (28) is provided on the inner bottom surface of the pool body (1). A sludge suction pipe (29) is connected to one side of the lower surface of the sludge collection hopper (28). A sludge suction pump group (30) is provided at one end of the sludge suction pipe (29). An overflow channel (4) is provided on the inner side of the pool body (1) and near the front of the inclined tube mechanism (31).

4. The circulating water treatment system for a high-density sedimentation tank according to claim 1, characterized in that: The drive mechanism includes a mounting base (12) fixedly installed on the upper surface of the top plate (11). A drive motor (13) is fixedly installed at the rear end of the mounting base (12). The output shaft of the drive motor (13) is fixedly connected to the upper end of the drive shaft (9). The drive shaft (9) rotates through the lower surface of the top plate (11). A mounting bracket (5) is fixedly sleeved on the outer surface of the guide tube (6). The mounting bracket (5) is fixedly installed on the inner wall of the pool body (1).

5. A method for treating circulating water in a high-density sedimentation tank, using the treatment system described in any one of claims 1-4, characterized in that: Includes the following steps: S1. A coagulant injection pipeline is arranged above the mixing zone, and a return sludge pipeline is connected below the mixing zone. The return sludge pipeline is connected to the inclined tube sedimentation zone. At the same time, a flocculant injection pipeline is arranged above the guide tube (6). S2. Wastewater enters the tank (1), and the flow rate is controlled to keep the wastewater height above the suspension sleeve (16). S3. During wastewater treatment, coagulant is continuously added to the mixing zone while sludge is returned, and colloidal particles in the wastewater are initially destabilized. S4. After the water flows through the mixing zone into the guide tube (6), flocculant is continuously added. The guide vanes (10) inside the guide tube (6) are used for medium-speed stirring, so that the destabilized particles collide and aggregate with each other to form a dense floc with good settling performance. The water carries the floc and overflows from the top of the guide tube (6). S5. After the water is evenly distributed, the water flows into the inclined tube sedimentation zone. The flocs settle quickly to the bottom of the pool (1) under the action of gravity, while the clear water flows upward and is discharged.

Images