A flotation wastewater sludge concentration and dewatering device

Abstract

The present application belongs to sewage treatment technical field, specifically disclose a kind of flotation wastewater sludge concentration dewatering device, including base, filtrate tank, dehydration spiral machine and drive device, base top is provided with flocculation tank, flocculation tank is connected with the dirty tank by the first overflow port of the side top opening, the side away from the dirty tank of flocculation tank is provided with defoaming tank, defoaming tank inside top is fixedly installed with overflow tank, flocculation tank is communicated with overflow tank inside by the second overflow port of the side top opening, dehydration spiral machine is obliquely arranged in the top of filtrate tank, dehydration spiral machine is communicated with defoaming tank inside by the dirty pipe of one end lower intercommunication installation, overflow tank inside lower portion is provided with vibrating reciprocating member, vibrating reciprocating member upper end is fixedly installed with defoaming disc, the present application solves the stable foam in flotation wastewater carries floc, floc settlement blockage and traditional mechanical transport easy to damage floc problem, significantly improve floc recovery rate and dehydration efficiency.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and specifically discloses a flotation wastewater sludge thickening and dewatering device. Background Technology

[0002] Sludge dewatering is a crucial step in wastewater treatment and industrial solid-liquid separation. In existing technologies, screw press sludge dewatering machines are widely used due to their advantages such as small size, low energy consumption, and high degree of automation. For example, Chinese invention patent CN109422435A discloses a sludge dewatering machine, which includes a flocculation mixing tank and a screw press dewatering body. The sludge is mixed with flocculant in the flocculation mixing tank and then directly fed into the screw press for extrusion dewatering. This solution is mainly for residual sludge from urban wastewater treatment plants or general industrial sludge. Such sludge typically has a high organic matter content, few bubbles, and low foam stability; therefore, the flocculation mixing tank only needs to perform the mixing function and does not need to consider foam interference issues.

[0003] However, in practical industrial applications, there exists a special type of flotation wastewater. Flotation wastewater mainly originates from froth flotation processes in industries such as mineral processing, phosphate chemicals, and coal chemicals. Typical characteristics of this type of wastewater include: the presence of large amounts of residual frothers (such as No. 2 oil, kerosene, xanthate, etc.) and collectors, causing the water to easily generate large amounts of stable foam when stirred or flowing; the presence of a large number of suspended fine mineral particles in the wastewater, which settle extremely slowly naturally and must be aggregated into larger flocs by adding flocculants (such as polyacrylamide) before effective dewatering; and the presence of numerous microbubbles in the wastewater, which adhere to the floc surface, reducing floc density and causing the flocs to float to the surface, forming a foam layer that cannot enter subsequent dewatering equipment.

[0004] The aforementioned device suffers from the following insurmountable technical problems in treating flotation wastewater: First, the stable foam generated in the flocculation mixing tank carries a large amount of already formed flocs to the surface, resulting in flocculant waste and a significant decrease in solid recovery rate. The prior art does not include any defoaming structure, thus failing to address the problem of foam carrying flocs.

[0005] Second, the flocculation mixing tank in the comparison document has a single-tank structure. When the flocs stay in the tank for a long time, they are prone to settling, causing mud accumulation at the bottom of the tank and pipe blockage, which affects the continuous operation of the system. If a common defoaming device (such as a foam scraper or spray) is simply added, the floc structure will be damaged or the mud concentration will be reduced due to mechanical shearing or dilution, and the dual goal of "defoaming and floc preservation at the same time" cannot be achieved.

[0006] In summary, for the specific scenario of flotation wastewater (which requires the addition of flocculants and contains a large amount of stable foam and microbubbles), it is necessary to make improvements to provide an effective sludge thickening and dewatering device that can eliminate foam, avoid floc destruction, and prevent sedimentation and clogging. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the background art, and to propose a flotation wastewater sludge thickening and dewatering device, including a base, a filtrate tank, a dewatering screw press, and a drive device. A flocculation tank is arranged above the base. The flocculation tank is connected to a sludge inlet tank through a first overflow port opened on one side of the upper part. A defoaming tank is arranged on the side of the flocculation tank away from the sludge inlet tank. An overflow tank is fixedly installed inside the upper part of the defoaming tank. The flocculation tank is connected to the interior of the overflow tank through a second overflow port opened on the upper part of the other side. The dewatering screw press is inclinedly arranged above the filtrate tank. The dewatering screw press is connected to the interior of the defoaming tank and the overflow tank through a sludge inlet pipe installed at one end of the lower part. A vibrating reciprocating component is arranged inside the lower part of the overflow tank. A defoaming plate is fixedly installed on the upper end of the vibrating reciprocating component. A defoaming component is arranged on the lower surface of the defoaming plate. An overflow plate is vertically installed inside the overflow tank and on the side near the sludge inlet pipe. A clump floating mechanism is slidably arranged outside the overflow plate.

[0008] In the above technical solution, the vibrating reciprocating component further includes a motor, which is fixedly installed inside the defoaming tank on one side and near the bottom. A drive shaft is fixedly installed on the output shaft of the motor. A cam is fixedly sleeved on the outside of the drive shaft. A support rod is provided in the middle of the inside of the defoaming disc. A movable rod is vertically connected in the middle of the inside of the support rod. An elastic element that drives the cam is provided at the lower end of the movable rod.

[0009] In the above technical solution, the elastic element further includes a ball bearing, which is embedded in the lower end of the movable rod. A spring is sleeved on the outside of the movable rod near the bottom of the overflow tank, and the ball bearing makes rolling contact with the outer edge of the cam.

[0010] In the above technical solution, the defoaming component further includes multiple defoaming needles, which are installed at equal intervals along the circumference on the lower surface of the defoaming disc.

[0011] In the above technical solution, an ultrasonic generator is fixedly installed on the top of the defoaming tank, and a U-shaped transmission rod is connected to the lower end of the ultrasonic generator. The U-shaped transmission rod extends into the interior of the defoaming plate, and an ultrasonic probe is provided at the lower end of the U-shaped transmission rod.

[0012] In the above technical solution, the agglomeration floating mechanism further includes a microporous filter disc, which is semi-circular in shape and has a semi-circular enclosure fixedly installed on its upper surface. An air blowing component is installed inside the semi-circular enclosure. A shaft hole is fixedly installed in the middle of the microporous filter disc. The shaft hole is located outside the movable rod and has a gap. A gap is left between the outer edge of the semi-circular enclosure and the microporous filter disc and the inner wall of the overflow tank. The bottom of the overflow tank is inclined. A pneumatic telescopic rod is installed on one side of the bottom of the overflow tank. The telescopic end of the pneumatic telescopic rod is fixedly connected to the bottom of the microporous filter disc. The microporous filter disc and the overflow plate are in sliding fit.

[0013] In the above technical solution, the air blowing assembly further includes a ring pipe and multiple connecting pipes. The ring pipe is located inside the semi-circular enclosure. The multiple connecting pipes are equidistantly arranged along the arc-shaped inner surface of the semi-circular enclosure. One end of each of the multiple connecting pipes is connected to the inside of the ring pipe, and the other end of each of the multiple connecting pipes is connected to an air storage box. A flat air port is opened on one side inside the air storage box, and a pressure sensor is installed on the upper surface of one end of the semi-circular enclosure.

[0014] In the above technical solution, a flexible hose is further connected to one end of the ring pipe, an air pipe is connected to the upper end of the flexible hose, an air pump is connected to the end of the air pipe away from the flexible hose, the air pump is fixedly installed outside the defoaming tank, an exhaust valve is connected to the top of the defoaming tank, and a pressure valve is connected to the side of the defoaming tank near the exhaust valve.

[0015] In the above technical solution, a stirrer is installed inside the flocculation tank, and a drive device is set at the top of the flocculation tank. The output end of the drive device is connected to the upper end of the stirrer. A dosing pump is fixedly installed on one side of the top of the flocculation tank. A dosing pipe is connected to the discharge port of the dosing pump. The lower end of the dosing pipe extends into the flocculation tank. A flange pipe is connected to the inlet of the dosing pump.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. This invention, by setting a first overflow port and a second overflow port between the flocculation tank and the overflow tank, combined with the vibrating reciprocating component and defoaming disc arranged inside the defoaming tank, can effectively separate foam and flocs generated during the flocculation process. Under the action of vibration, the defoaming disc drives the defoaming component to repeatedly puncture the foam layer, quickly eliminating the stable foam caused by frothers and microbubbles in the flotation wastewater, releasing the flocs encased in the foam, and significantly improving the utilization efficiency of the flocculant and the solid recovery rate.

[0018] 2. This invention features a liftable microporous filter disc and a semi-circular enclosure above it inside the overflow tank. The microporous filter disc carries the flocs upwards to above the overflow plate and remains stationary. When the microporous filter disc passes above the overflow plate, the air-blowing assembly activates, flexibly blowing the flocs towards the overflow plate. Simultaneously, this, combined with the wastewater inside the tank, creates a flexible lifting effect, allowing the flocs to smoothly cross the overflow plate in a loose state and enter the subsequent dewatering process. This prevents the flocs from being damaged by strong impacts and ensures the integrity of the floc structure.

[0019] 3. This invention features a sloped surface at the bottom of the overflow tank, which works in conjunction with the descent of the microporous filter disc. As the microporous filter disc moves downward, the gap between the filter disc and the tank bottom gradually narrows due to the conical layout of the sloped surface, increasing the downward pressure resistance. This design buffers the flocculants that would otherwise fall to the bottom through the gaps at the edge of the semi-circular enclosure, allowing the flocculants to flow upward through the gap between the semi-circular enclosure and the inner wall of the overflow tank.

[0020] 4. The present invention sets an ultrasonic generator at the top of the defoaming tank and transmits ultrasonic vibration to the inside of the defoaming disc through a U-shaped transmission rod. Under the synergistic effect of mechanical vibration and ultrasonic vibration, the defoaming disc performs a double defoaming treatment on the foam layer. It is especially suitable for flotation wastewater containing a large number of microbubbles, further improving the defoaming effect and the free settling performance of flocs.

[0021] 5. This invention integrates flocculation, defoaming, flexible floc conveying, inclined plane-assisted compression, and screw press dewatering into a single compact structure, suitable for difficult-to-treat industrial wastewater scenarios such as flotation wastewater. By combining physical defoaming, flexible pneumatic conveying, and inclined plane-assisted compression, it achieves efficient solid-liquid separation without damaging the floc structure, significantly improving the concentration and stability of the sludge entering the dewatering screw press, ultimately increasing dewatering efficiency and cake solids content. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram showing the connection structure between the integrated cabinet and the outer tank of the present invention.

[0024] Figure 3 This is a schematic diagram showing the disassembled internal structure of the dewatering screw press of the present invention;

[0025] Figure 4 This is a schematic diagram showing the disassembled structure of the inner part of the flocculation tank of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection structure between the flocculation tank and the defoaming tank of the present invention;

[0027] Figure 6 This is a schematic diagram showing the disassembled structure of the inner part of the overflow tank of the present invention;

[0028] Figure 7 This is a schematic diagram of the connection structure between the foam breaking component and the vibrating reciprocating component of the present invention;

[0029] Figure 8 This is a schematic diagram of the connection structure between the microporous filter disc and the semi-circular enclosure of the present invention.

[0030] In the diagram: 1. Base; 2. Filtration tank; 3. Dewatering screw press; 4. Inlet pipe; 5. Flocculation tank; 6. Inlet tank; 7. Drive unit; 8. Defoamer tank; 9. Dosing pump; 10. Dosing pipe; 11. Exhaust valve; 12. Pressure valve; 13. Ultrasonic generator; 14. Air pump; 15. Agitator; 16. Connecting pipe; 17. Drive shaft; 18. First overflow port; 19. Second overflow port; 20. Overflow tank; 21. 22. U-shaped drive rod; 23. Flat air inlet; 24. Pneumatic telescopic rod; 25. Semi-circular enclosure; 26. Air passage pipe; 27. Inclined surface; 28. Overflow plate; 29. ​​Ring pipe; 30. Motor; 31. Cam; 32. Movable rod; 33. Defoaming needle; 34. Defoaming disc; 35. Support rod; 36. Ultrasonic probe plate; 37. Spring; 38. Ball bearing; 39. Hose; 40. Microporous filter disc; 41. Shaft hole; 42. Air storage box. Detailed Implementation

[0031] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0033] like Figures 1-8 The flotation wastewater sludge thickening and dewatering device shown includes a base 1, a filtrate tank 2, a dewatering screw press 3, and a drive unit 7. A flocculation tank 5 is installed above the base 1. The flocculation tank 5 is connected to a sludge inlet tank 6 through a first overflow port 18 on one side of the upper part. A defoaming tank 8 is installed on the side of the flocculation tank 5 away from the sludge inlet tank 6. An overflow tank 20 is fixedly installed inside the upper part of the defoaming tank 8. The flocculation tank 5 is connected to the interior of the overflow tank 20 through a second overflow port 19 on the upper part of the other side. The dewatering screw press 3 is inclinedly set above the filtrate tank 2. The dewatering screw press 3 is connected to the defoaming tank 8 and the overflow tank 20 through the inlet pipe 4 installed at one end. A vibrating reciprocating component is set at the bottom of the overflow tank 20. A defoaming plate 33 is fixedly installed at the upper end of the vibrating reciprocating component. A foam breaking component is set on the lower surface of the defoaming plate 33. An overflow plate 27 is vertically installed inside the overflow tank 20 and on the side close to the inlet pipe 4. A clump floating mechanism is slidably set on the outside of the overflow plate 27.

[0034] In this embodiment, the stable foam generated after the flotation wastewater is flocculated carries the flocs to the surface and overflows into the overflow tank 20 through the second overflow port 19. The vibrating reciprocating component drives the defoaming plate 33 to move up and down, and the foam breaking component breaks the foam and releases the flocs. The agglomeration floating mechanism collects the released flocs from below the liquid surface and transfers them to the other side of the overflow plate 27 to prevent the flocs from floating up again or being carried away by the foam.

[0035] It should be noted that the opening height of the second overflow port 19 is matched with the normal working liquid level in the flocculation tank 5 to ensure that the flocs and foam enter the overflow tank 20 simultaneously, thereby preventing the flocs from settling at the bottom of the flocculation tank 5 and ensuring that all the flocs enter the defoaming and conveying process.

[0036] The vibrating reciprocating component includes a motor 29, which is fixedly installed inside the defoaming tank 8 on one side and near the bottom. The output shaft of the motor 29 is fixedly installed with a drive shaft 17. A cam 30 is fixedly sleeved on the outside of the drive shaft 17. A support rod 34 is provided in the middle of the inside of the defoaming disc 33. A movable rod 31 is vertically connected in the middle of the inside of the support rod 34. An elastic element that drives the cam 30 is provided at the lower end of the movable rod 31.

[0037] In this embodiment, after the motor 29 is powered on, it drives the drive shaft 17 and the cam 30 to rotate. The contour surface of the cam 30 periodically pushes against the elastic element, which in turn drives the defoaming disc 33 to vibrate up and down through the movable rod 31 and the support rod 34. This structure can effectively penetrate and destroy the sticky foam formed by surfactants in the flotation wastewater.

[0038] The elastic element includes a ball 37, which is embedded in the lower end of the movable rod 31. A spring 36 is sleeved on the outside of the movable rod 31 and near the bottom of the overflow tank 20. The ball 37 makes rolling contact with the outer edge of the cam 30.

[0039] In this embodiment, when the cam 30 rotates, its outer edge pushes the ball 37, which transmits the motion to the movable rod 31 and compresses the spring 36. After the cam 30 rotates past its highest point, the spring 36 returns to its original position and pushes the movable rod 31 downward, thus achieving reciprocating motion. The rolling contact of the ball 37 replaces sliding friction, significantly reducing wear and heat generation on the contact surface.

[0040] It should be noted that a dustproof sealing ring should be provided at the fitting point between the ball bearing 37 and the movable rod 31 to prevent fine sand or flocculent particles from entering and causing the ball bearing 37 to jam; the spring 36 should be made of stainless steel to prevent corrosion.

[0041] The defoaming assembly includes multiple defoaming needles 32, which are installed at equal intervals along the circumference on the lower surface of the defoaming disc 33.

[0042] In this embodiment, as the defoaming disc 33 moves up and down with the movable rod 31, the defoaming needle 32 repeatedly punctures the foam layer, and the needle tip punctures the bubble wall, releasing the gas and causing the foam to burst. The equidistant circumferential arrangement ensures that there are no dead corners in the defoaming area covered by the defoaming disc 33, and the local high stress concentration generated by the needle tip can quickly destroy the composite bubble wall containing solid particles, significantly improving the defoaming efficiency.

[0043] An ultrasonic generator 13 is fixedly installed on the top of the defoaming tank 8. A U-shaped transmission rod 21 is connected to the lower end of the ultrasonic generator 13. The U-shaped transmission rod 21 extends into the defoaming plate 33. An ultrasonic probe plate 35 is provided at the lower end of the U-shaped transmission rod 21.

[0044] In this embodiment, the ultrasonic generator 13 generates a high-frequency electrical signal after being powered on. This signal is converted into mechanical vibration by a transducer and transmitted to the ultrasonic probe plate 35 via the U-shaped transmission rod 21, causing the probe plate to generate high-frequency micro-vibrations. This high-frequency vibration is superimposed on the original mechanical reciprocating vibration of the defoaming disc 33, forming a compound foam-breaking effect. In this way, the ultrasonic waves can effectively destroy the elasticity of the liquid film on the surface of the bubble wall, causing the micro-bubbles to merge and rupture. This is especially suitable for stable microbubble layers formed by residual frothers in flotation wastewater, significantly improving the thoroughness of defoaming.

[0045] It should be noted that the power of the ultrasonic generator 13 should be automatically adjusted according to the thickness of the foam layer to avoid excessive vibration that could cause the flocs to break.

[0046] The agglomeration floating mechanism includes a microporous filter disc 39, which is semi-circular in shape and has a semi-circular enclosure 24 fixedly installed on its upper surface. An air blowing component is installed inside the semi-circular enclosure 24. A shaft hole 40 is fixedly installed in the middle of the microporous filter disc 39. The shaft hole 40 is located outside the movable rod 31 and has a gap. A gap is left between the outer edge of the semi-circular enclosure 24 and the microporous filter disc 39 and the inner wall of the overflow tank 20. The bottom of the overflow tank 20 is set with an inclined surface 26. A pneumatic telescopic rod 23 is set on one side of the bottom of the overflow tank 20. The telescopic end of the pneumatic telescopic rod 23 is fixedly connected to the bottom of the microporous filter disc 39. The microporous filter disc 39 and the overflow plate 27 are in sliding fit.

[0047] In this embodiment, after the flocs settle and accumulate in the overflow tank 20, the pneumatic telescopic rod 23 pushes the microporous filter disc 39 upward, and the semi-circular box 24 catches and lifts the flocs to near the liquid surface. When the microporous filter disc 39 passes the upper edge of the overflow plate 27, the air blowing assembly is activated to blow the flocs to the other side of the overflow plate 27. During descent, the inclined surface 26 gradually reduces the gap between the microporous filter disc 39 and the bottom of the tank, forming a flexible compression on the remaining flocs at the bottom, causing them to flow back upward along the gap, and re-entraining the bottom sediments into the rising flow, avoiding deposition and blockage. This mechanism can realize the cycle of floc collection, lifting, pneumatic conveying, and resetting, and the conveying process is a flexible blowing that does not damage the floc structure.

[0048] It should be noted that the pore size of the microporous filter disc 39 should be smaller than the minimum particle size of the flocs to prevent floc leakage; the stroke of the pneumatic telescopic rod 23 should be matched with the height of the overflow plate 27 to ensure that the microporous filter disc 39 can rise above the upper edge of the overflow plate 27 to facilitate air blowing.

[0049] The air blowing assembly includes a ring pipe 28 and multiple connecting pipes 16. The ring pipe 28 is located inside the semi-circular enclosure 24. The multiple connecting pipes 16 are equidistantly arranged along the arc-shaped inner surface of the semi-circular enclosure 24. One end of each of the multiple connecting pipes 16 is connected to the inside of the ring pipe 28, and the other end of each of the multiple connecting pipes 16 is connected to an air storage box 41. A flat air port 22 is opened on one side of the inside of the air storage box 41. A pressure sensor is installed on the upper surface of one end of the semi-circular enclosure 24.

[0050] In this embodiment, compressed air is evenly distributed to each connecting pipe 16 via the ring pipe 28, enters the air storage box 41, and is ejected from the flat air outlet 22, forming a flat fan-shaped airflow. Since the flat air outlet 22 faces the overflow plate 27, the airflow pushes the flocs in the semi-circular enclosure 24 horizontally at a low speed, over the overflow plate 27. The pressure sensor monitors the floc accumulation in real time, and triggers the air blowing action when the accumulation height reaches a set threshold. A uniform air curtain is generated by multiple equidistant flat air outlets 22, avoiding excessive local airflow that could cause floc breakage; the air blowing action is gentle and controllable, ensuring that the flocs completely cross the overflow plate 27.

[0051] It should be noted that the opening width of the flat air inlet 22 should be 2 mm to meet the conveying requirements of the flocs; if the moisture content of the flocs is too high, the air source pressure can be appropriately reduced to prevent the flocs from being blown apart.

[0052] When the microporous filter disc 39 rises, the defoaming disc 33 stops vibrating and rises to its highest position. The microporous filter disc 39 only operates after the flocs have been collected. Therefore, the movement paths do not intersect and there is no mechanical interference.

[0053] One end of the ring pipe 28 is internally connected to a hose 38, the upper end of the hose 38 is connected to an air pipe 25, the end of the air pipe 25 away from the hose 38 is connected to an air pump 14, the air pump 14 is fixedly installed outside the defoaming tank 8, the top of the defoaming tank 8 is connected to an exhaust valve 11, and the inside of the defoaming tank 8 and the side close to the exhaust valve 11 is connected to a pressure valve 12.

[0054] In this embodiment, the air pump 14 generates compressed air, which is delivered to the ring pipe 28 via the air passage pipe 25 and the hose 38. The design of the hose 38 allows the air supply line to remain uninterrupted when the microporous filter disc 39 is raised or lowered. The exhaust valve 11 and the pressure valve 12 work together to maintain a slightly positive pressure environment inside the defoaming tank 8, on the one hand preventing external air from entering the system and on the other hand assisting in foam breaking.

[0055] Specifically, pressure valve 12 can release overpressured gas to prevent overpressure in the tank; exhaust valve 11 can quickly depressurize during maintenance.

[0056] It should be noted that an air filter can be installed at the inlet of the air pump 14 to prevent dust from being sucked in, and an air pressure control valve can be added to the air pipe 25 to adjust the air pressure; the hose 38 should be made of oil-resistant and corrosion-resistant rubber or polyurethane material to adapt to the possible volatile organic solvent atmosphere in the flotation wastewater.

[0057] A stirrer 15 is installed inside the flocculation tank 5. A drive device 7 is located on the top of the flocculation tank 5. The output end of the drive device 7 is connected to the upper end of the stirrer 15. A dosing pump 9 is fixedly installed on one side of the top of the flocculation tank 5. A dosing pipe 10 is connected to the discharge port of the dosing pump 9. The lower end of the dosing pipe 10 extends into the flocculation tank 5. A flange pipe is connected to the inlet of the dosing pump 9.

[0058] In this embodiment, after the flotation wastewater overflows from the inlet tank 6 into the flocculation tank 5, the drive device 7 drives the agitator 15 to rotate, while the dosing pump 9 injects flocculant into the flocculation tank 5 through the dosing pipe 10. The agitator 15 rapidly mixes the reagent with the wastewater, promoting the collision and aggregation of fine suspended particles into large flocs. The dosing pump 9 can achieve quantitative dosing, saving reagent costs.

[0059] It should be noted that, since the flotation wastewater may contain residual xanthate, kerosene and other organic matter, the blades of the agitator 15 should be made of corrosion-resistant stainless steel.

[0060] Working Principle: During operation, flotation wastewater is first fed into the inlet tank 6 via a pipeline. The inlet tank 6 is connected to the flocculation tank 5 through the first overflow port 18. Inside the flocculation tank 5, the wastewater is stirred by the agitator 15 driven by the drive device 7. Simultaneously, the dosing pump 9 adds flocculant to the flocculation tank 5 through the dosing pipe 10, causing the fine suspended particles in the wastewater to aggregate into larger flocs. Because the flotation wastewater contains foaming agents and a large number of fine bubbles, a large amount of stable foam is generated during stirring. The foam carries some flocs to the surface. The mixture (containing flocs, foam, and water) in the upper part of the flocculation tank 5 overflows through the second overflow port 19 into the overflow tank 20 inside the defoaming tank 8. The overflow tank 20 is equipped with a vibrating reciprocating component: the motor 29 drives the drive shaft 17 to rotate, which in turn drives the cam 30 to rotate. The cam 30 rolls in contact with the ball bearing 37 at the lower end of the movable rod 31, and, in conjunction with the spring 36, causes the movable rod 31 and the defoaming disc 33 to vibrate up and down. Multiple foam-breaking needles 32 are installed on the lower surface of the defoaming disc 33. During vibration, they repeatedly pierce the foam layer, quickly destroying the stable foam and releasing the flocs trapped in the foam. At the same time, the ultrasonic generator 13 at the top of the defoaming tank 8 transmits ultrasonic vibrations to the ultrasonic probe plate 35 via the U-shaped transmission rod 21. The ultrasonic probe plate 35 is located inside the defoaming disc 33 and applies high-frequency micro-vibration to the foam layer, achieving the dual effects of mechanical foam breaking and ultrasonic foam breaking, significantly improving the defoaming effect and allowing the flocs to settle freely.

[0061] After defoaming, the flocs and water mixture gradually stratify within the overflow tank 20, with the flocs, being denser, tending to sink. A pneumatic telescopic rod 23 is located on one side of the bottom of the overflow tank 20, its telescopic end connected to a microporous filter disc 39. Initially, the microporous filter disc 39 is located below the inclined surface 26 at the bottom of the overflow tank 20. As the flocs accumulate, the pressure sensor receives a signal, and the pneumatic telescopic rod 23 pushes the microporous filter disc 39 upwards. The microporous filter disc 39 is semi-circular, with a semi-circular surrounding box 24 fixed to its upper surface, leaving a gap between their outer edges and the inner wall of the overflow tank 20. During the ascent of the microporous filter disc 39, the flocs are trapped on its upper surface. When the microporous filter disc 39 passes the upper edge of the overflow plate 27, the air pump 14 is activated, and compressed air enters the ring pipe 28 via the air passage pipe 25 and the hose 38, then is distributed to each air storage box 41 via multiple connecting pipes 16, and finally sprayed horizontally from the flat air outlet 22. The flat air inlet 22 faces the overflow plate 27. The airflow gently blows the flocs in the semi-circular box 24 to the other side of the overflow plate 27. At the same time, the sewage in the tank lifts the flocs, preventing them from being impacted and broken.

[0062] After the flocs overflow the overflow plate 27, they fall into the inlet pipe 4 on the other side and enter the dewatering screw press 3. Then, the pneumatic telescopic rod 23 drives the microporous filter disc 39 to descend and reset. During the descent, because the bottom of the overflow tank 20 is provided with an inclined surface 26, the gap between the microporous filter disc 39 and the bottom of the tank gradually decreases, which generates flexible compression and obstruction on the small amount of flocs remaining at the bottom, causing them to flow upward through the gap between the semi-circular box 24 and the inner wall of the overflow tank 20, thus preventing flocs from depositing and clogging.

[0063] The defoaming tank 8 is equipped with an exhaust valve 11 and a pressure valve 12 at the top inside to regulate the air pressure inside the tank. After defoaming and floc conveying, the mixed liquid (containing high-concentration flocs) enters the dewatering screw press 3 from the bottom of the defoaming tank 8 through the sludge inlet pipe 4. The dewatering screw press 3 is installed at an angle above the filtrate tank 2. It squeezes out the water from the flocs through screw extrusion, and the filtrate falls into the filtrate tank 2 for collection and discharge. The dewatered mud cake is discharged from the end of the dewatering screw press 3, completing the entire concentration and dewatering process.

[0064] 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.

Claims

1. A flotation wastewater sludge thickening and dewatering device, comprising a base (1), a filtrate tank (2), a dewatering screw press (3), and a drive device (7), characterized in that, A flocculation tank (5) is provided above the base (1). The flocculation tank (5) is connected to the sludge inlet tank (6) through a first overflow port (18) opened on one side above. A defoaming tank (8) is provided on the side of the flocculation tank (5) away from the sludge inlet tank (6). An overflow tank (20) is fixedly installed inside the defoaming tank (8). The flocculation tank (5) is connected to the overflow tank (20) through a second overflow port (19) opened on the other side above. The dewatering screw press (3) is inclined and set on the upper part of the filtrate tank (2). The dewatering screw press (3) is connected to the defoaming tank (8) and the overflow tank (20) through a sludge inlet pipe (4) installed at one end. A vibrating reciprocating component is provided at the bottom of the overflow tank (20). A defoaming disc (33) is fixedly installed at the upper end of the vibrating reciprocating component. A foam breaking component is provided on the lower surface of the defoaming disc (33). An overflow plate (27) is vertically installed inside the overflow tank (20) and on the side near the sludge inlet pipe (4). A clump floating mechanism is slidably provided on the outside of the overflow plate (27).

2. The flotation wastewater sludge thickening and dewatering device according to claim 1, characterized in that, The vibrating reciprocating component includes a motor (29), which is fixedly installed inside the defoaming tank (8) on one side and near the bottom. The output shaft of the motor (29) is fixedly installed with a drive shaft (17). A cam (30) is fixedly sleeved on the outside of the drive shaft (17). A support rod (34) is provided in the middle of the inside of the defoaming disc (33). A movable rod (31) is vertically connected in the middle of the inside of the support rod (34). An elastic element that drives the cam (30) is provided at the lower end of the movable rod (31).

3. The flotation wastewater sludge thickening and dewatering device according to claim 2, characterized in that, The elastic element includes a ball (37) which is embedded in the lower end of the movable rod (31). A spring (36) is sleeved on the outside of the movable rod (31) and near the bottom of the overflow tank (20). The ball (37) makes rolling contact with the outer edge of the cam (30).

4. The flotation wastewater sludge thickening and dewatering device according to claim 1, characterized in that, The defoaming assembly includes multiple defoaming needles (32), which are installed at equal intervals along the circumferential direction on the lower surface of the defoaming plate (33).

5. The flotation wastewater sludge thickening and dewatering device according to claim 1, characterized in that, An ultrasonic generator (13) is fixedly installed on the top of the defoaming tank (8). A U-shaped transmission rod (21) is connected to the lower end of the ultrasonic generator (13). The U-shaped transmission rod (21) extends into the defoaming plate (33). An ultrasonic probe plate (35) is provided at the lower end of the U-shaped transmission rod (21).

6. The flotation wastewater sludge thickening and dewatering device according to claim 1, characterized in that, The agglomeration floating mechanism includes a microporous filter disc (39), which is semi-circular and has a semi-circular enclosure (24) fixedly installed on its upper surface. An air blowing component is provided inside the semi-circular enclosure (24). A shaft hole (40) is fixedly installed in the middle of the microporous filter disc (39). The shaft hole (40) is located outside the movable rod (31) and has a gap. A gap is left between the outer edge of the semi-circular enclosure (24) and the microporous filter disc (39) and the inner wall of the overflow tank (20). The bottom of the overflow tank (20) is set with an inclined surface (26). A pneumatic telescopic rod (23) is provided on one side of the bottom of the overflow tank (20). The telescopic end of the pneumatic telescopic rod (23) is fixedly connected to the bottom of the microporous filter disc (39). The microporous filter disc (39) and the overflow plate (27) slide together.

7. The flotation wastewater sludge thickening and dewatering device according to claim 6, characterized in that, The air blowing assembly includes a ring pipe (28) and multiple connecting pipes (16). The ring pipe (28) is located inside a semi-circular enclosure (24). The multiple connecting pipes (16) are equidistantly arranged along the arc-shaped inner surface of the semi-circular enclosure (24). One end of each of the multiple connecting pipes (16) is connected to the inside of the ring pipe (28), and the other end of each of the multiple connecting pipes (16) is connected to an air storage box (41). A flat air inlet (22) is opened on one side inside the air storage box (41). A pressure sensor is installed on the upper surface of one end of the semi-circular enclosure (24).

8. The flotation wastewater sludge thickening and dewatering device according to claim 7, characterized in that, One end of the ring pipe (28) is internally connected to a hose (38), and the upper end of the hose (38) is connected to an air pipe (25). The end of the air pipe (25) away from the hose (38) is connected to an air pump (14). The air pump (14) is fixedly installed outside the defoaming tank (8). The top of the defoaming tank (8) is connected to an exhaust valve (11), and the inside of the defoaming tank (8) and the side close to the exhaust valve (11) is connected to a pressure valve (12).

9. A flotation wastewater sludge thickening and dewatering device according to claim 1, characterized in that, The flocculation tank (5) is equipped with a stirrer (15). The drive device (7) is located on the top of the flocculation tank (5). The output end of the drive device (7) is connected to the upper end of the stirrer (15). A dosing pump (9) is fixedly installed on one side of the top of the flocculation tank (5). The discharge port of the dosing pump (9) is connected to a delivery pipe (10). The lower end of the delivery pipe (10) extends into the flocculation tank (5). The inlet of the dosing pump (9) is connected to a flange pipe.

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