Dissolved air type air flotation machine

Abstract

The invention belongs to the technical field of air floatation machines, and particularly relates to an air dissolving type air floatation machine which comprises a main box body, the chemical mixing mechanism is installed on the lower left portion of the cavity of the main box body, the gas dissolving tank is installed outside the main box body, the input end of the water feeding pipe extends into the gas dissolving tank, the gas pumping pipe is installed at the output end of the water feeding pipe, the gas pumping pipe is installed at the bottom of the gas mixing area, and the water pump is installed at the lower end of the gas mixing area. The input end of the water return pipe is connected with one water outlet of the water pump, the output end of the water return pipe extends into the air dissolving tank, the shovel groove is installed on the upper portion of a cavity of the main box body in a left-right moving mode, the left end of the shovel groove extends into the air floating layer, and the slag suction pipe is installed on the main box body. The input end of the slag suction pipe extends between the shovel groove and the top wall of the main box body; the scum gathering group is shoveled up and discharged, so that the scum gathering group is prevented from being scattered and sinking, and the scum removing efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of dissolved air flotation technology, and in particular relates to a dissolved air flotation machine. Background Technology

[0002] An air flotation machine is a water treatment device that uses a dissolved air system to generate a large number of microbubbles in water. This allows air to adhere to suspended particles in the form of highly dispersed microbubbles, creating a density less than that of water. By utilizing the principle of buoyancy, these particles float on the water surface, thus achieving solid-liquid separation.

[0003] In the prior art, Chinese invention patent CN117843068B discloses a high-efficiency dissolved air flotation machine. This flotation machine includes a housing with an open side. Baffles and inclined plates are fixedly installed on the inner wall of the housing, dividing the interior into a dosing area, a flotation area, and a separation area. A separation plate with multiple through holes is installed within the flotation area. This invention, as a high-efficiency dissolved air flotation machine, utilizes the separation plate to initially separate heavier and larger suspended solids in wastewater without increasing the flotation machine's area. The accumulated sludge is directly extracted, reducing the overall particle size and content of suspended solids on the upper side of the separation plate, thus reducing the workload of flotation. It can increase the water flow velocity, eliminating concerns about the water flow washing away suspended solids that cannot float in time. The water flow velocity and dissolved air efficiency can be increased simultaneously, significantly improving the efficiency of suspended solids separation in wastewater.

[0004] However, the existing technology uses a recyclable scraper to scrape the accumulated scum to the collection tank. During the scraping process, the scum agglomerates are easily broken up by the scraper, causing the scum to detach from the air bubbles and sink, thus reducing the scum removal efficiency. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention provides a dissolved air flotation machine that improves the efficiency of scum removal by shoveling up and discharging the scum agglomerates, thus preventing the scum agglomerates from being broken up and sinking.

[0006] The present invention provides a dissolved air flotation machine, comprising a main housing with a chamber inside; and further comprising a mixing mechanism, an air dissolving tank, a water delivery pipe, an air pump pipe, a water pump, a return water pipe, a shovel, and a sludge suction pipe; The mixing mechanism is installed in the lower left part of the main chamber. The space above the mixing mechanism is designated as the air-flotation mixing zone, and the upper part of the air-flotation mixing zone is designated as the flotation layer. The mixing mechanism is used to mix wastewater with flocculants and coagulants to form a mixed liquid and to transport the mixed liquid to the air-flotation mixing zone. The space to the right of the mixing mechanism is designated as the sedimentation zone. The aerosol tank is installed outside the main chamber. The aerosol tank is used to mix clean water with high-pressure air to form aerosol water. The inlet end of the water supply pipe extends into the interior of the aerosol tank, and the outlet end of the water supply pipe is equipped with a pump air pipe. The pump air pipe is installed at the bottom of the air-flotation mixing zone. The water pump is installed on the right side of the main chamber. The water pump's suction pipe extends into the middle of the sedimentation zone. The inlet end of the return water pipe is connected to one outlet of the water pump, and the outlet end of the return water pipe extends into the interior of the aerosol tank. The shovel is slidably installed on the upper part of the main chamber, with the left end of the shovel extending into the air flotation layer. The slag suction pipe is installed on the main chamber, with the input end of the slag suction pipe extending between the shovel and the top wall of the main chamber.

[0007] The suction pipe is connected to an external vacuum pump. During operation, the shovel moves to the top of the sedimentation zone of the main tank. Wastewater is fed into the mixing mechanism, where flocculants and coagulants are added, causing dissolved substances in the wastewater to precipitate as flocs and coagulants. The wastewater containing flocculants and coagulants is then fed into the air mixing zone of the main tank, where it mixes with dissolved air from the pump's air pipe. The dissolved air is depressurized, and the air within it forms numerous microbubbles that precipitate and adsorb the flocculants and coagulants in the wastewater. This causes the flocculants and coagulants to aggregate and float to the flotation layer. The clear water below the flotation layer flows into the sedimentation zone. The clear water in the middle of the sedimentation zone is pumped out; part of the clear water is sent to the subsequent treatment system, and the other part is returned to the system. Water is fed into the aerosol tank and mixed with high-pressure air to form aerosol water. The aerosol water is then fed into the air pump pipe through the water supply pipe, forming a cycle of clean water. When the flocs and aggregates that have accumulated in the flotation layer reach the bottom left of the designated thickness, the shovel moves to the left and enters the mixing zone, causing the shovel to scoop into the bottom of the flotation layer. This collects the flocs and aggregates as a whole in the upper part of the shovel. The vacuum pump then uses a suction pipe to discharge the flocs and aggregates from the shovel into the main tank for further processing. After the flocs and aggregates are discharged, the shovel returns to its original position to the right. Compared with existing technologies, by shoveling up and discharging the scum aggregates, the scum aggregates are prevented from being broken up and sinking away from the air bubbles, thus improving the efficiency of scum removal.

[0008] Preferably, a shovel plate is installed at the left end of the shovel groove. The middle of the shovel plate protrudes upwards, and the left end of the shovel plate extends downwards to below the air flotation layer. Multiple filter holes are provided on the left side of the shovel plate. When the shovel groove moves to the left, the left side of the shovel plate scoops up the flocs and agglomerates floating in the air flotation layer. This allows the flocs and agglomerates to be scooped up along the left side of the shovel plate, passing over the protrusion and entering the upper part of the shovel groove, improving the efficiency of scooping up flocs and agglomerates and preventing them from overflowing from the shovel groove, thus improving the collection efficiency of flocs and agglomerates. It also includes multiple filter holes. When the flocs and agglomerates are scooped up along the left side of the shovel plate, the mixed wastewater is filtered out through these holes, reducing the discharge of mixed wastewater and improving the removal efficiency of flocs and agglomerates.

[0009] Preferably, it also includes two slide rails, multiple slider brackets, and two pushing components. The two slide rails are respectively installed on the front and rear inner walls of the main housing. The multiple slider brackets are installed on the shovel groove and are slidably connected to the corresponding slide rails. The fixed ends of the two pushing components are installed on the slider brackets, and the piston rods of the two pushing components are connected to the main housing. The shovel groove is slidably installed on the two slide rails through the multiple slider brackets. The extension or shortening of the piston rods of the two pushing components drives the shovel groove to move left and right, so that the shovel groove can scoop up flocs and agglomerates in the air flotation layer and return to the right, which is practical.

[0010] Preferably, it also includes a movable baffle plate, which is installed on the lower end face of the shovel groove. When the shovel groove is located in the air-mixing zone, the lower end face of the movable baffle plate contacts the upper end face of the mixing mechanism, and the water pump's suction pipe is located on the right side of the movable baffle plate. When the shovel groove is located in the sedimentation zone of the main tank, the movable baffle plate separates the water pump's suction pipe from the sedimentation zone, preventing sediment from being pumped out by the water pump, improving the purity of the clear water, and improving the sedimentation efficiency. When the shovel groove is located in the air-mixing zone of the main tank and scoops up flocs and agglomerates, the lower end of the movable baffle plate contacts the mixing mechanism, thereby separating the air-mixing zone from the sedimentation zone, preventing flocs and agglomerates from overflowing into the sedimentation zone, and improving the removal efficiency of flocs and agglomerates.

[0011] Preferably, the system also includes a fixed baffle plate, a first sludge discharge pipe, and a second sludge discharge pipe. The fixed baffle plate is installed in the lower right part of the sedimentation zone of the main tank. When the shovel is located in the sedimentation zone, the top of the fixed baffle plate is aligned with the moving baffle plate. A clear water channel is provided between the top of the fixed baffle plate and the moving baffle plate. The input ends of the first and second sludge discharge pipes extend into the bottom of the sedimentation zone of the main tank. The first and second sludge discharge pipes are located on the left and right sides of the fixed baffle plate, respectively. The sediment in the sedimentation zone settles to the left and right sides of the fixed baffle plate, respectively. Most of the sediment gathers on the left side of the fixed baffle plate and is discharged through the first sludge discharge pipe, while a small portion of the sediment settles on the right side of the fixed baffle plate and is discharged through the second sludge discharge pipe, thereby improving the sedimentation and sludge discharge efficiency.

[0012] Preferably, the device also includes an air inlet pipe, an inner liner, and a pressure sensor. The inner liner is installed inside the aerosol container, and an air gap is provided between the inner liner and the interior of the aerosol container. The output end of the air inlet pipe extends into the air gap. Multiple micro-pores are provided on the inner liner. The pressure sensor is installed on the aerosol container, and the probe of the pressure sensor extends into the interior of the aerosol container. The air inlet pipe is connected to an external high-pressure air system. High-pressure air is input into the air gap between the inner liner and the interior of the aerosol container through the air inlet pipe, and the high-pressure air forms microbubbles through the multiple micro-pores of the inner liner, which quickly dissolve into the clear water inside the aerosol container, improving the efficiency of aerosol water formation. The pressure sensor detects the pressure inside the aerosol container and adjusts the opening and closing of the air inlet pipe according to the pressure value to keep the pressure stable.

[0013] Preferably, the mixing mechanism includes a mixing tank, an inner partition, a wastewater pipe, a first dosing pipe, a second dosing pipe, and a third dosing pipe. The mixing tank is installed in the lower left part of the main chamber. The mixing tank has a mixing chamber inside, and the inner partition is installed in the middle of the mixing chamber. The inner partition has multiple liquid passage holes, dividing the mixing chamber into a flocculation chamber and a coagulation chamber. The wastewater pipe and the first dosing pipe both pass through the main chamber and extend into the flocculation chamber. The second dosing pipe passes through the main chamber and extends into the coagulation chamber. The outlet pipe is installed on the mixing tank. The input end extends into the interior of the coagulation chamber, and the air pump pipe is located to the right of the output end of the liquid outlet pipe. Wastewater is input into the flocculation chamber of the mixing tank through the wastewater pipe. Flocculant is input into the flocculation chamber through the first dosing pipe and mixes with the wastewater to cause the dissolved harmful substances in the wastewater to flocculate and precipitate. The flocs flow into the coagulation chamber of the mixing tank through the liquid passage holes of the inner partition. Flocculant is input into the coagulation chamber through the second dosing pipe and mixes with the wastewater, causing the flocs to agglomerate. The wastewater is input into the air mixing zone of the main tank through the liquid outlet pipe. It has good practicality.

[0014] Preferably, it also includes a motor, a stirring shaft, and multiple stirring rods. The motor is installed outside the main housing, the stirring shaft is rotatably installed in the mixing chamber, the end of the stirring shaft is connected to the output shaft of the motor, and multiple stirring rods are installed on the outer wall of the stirring shaft. The multiple stirring rods are located in the flocculation chamber and the coagulation chamber, respectively. The motor drives the stirring shaft and the multiple stirring rods to rotate, so that the multiple stirring rods stir and mix the wastewater, flocculant, and coagulant, thereby improving the mixing uniformity.

[0015] Preferably, the device also includes multiple arc-shaped plates, which are evenly installed circumferentially on the stirring shaft. The inlet end of the outlet pipe is provided with an arc-shaped opening, and the multiple arc-shaped plates alternately block the arc-shaped opening of the outlet pipe. By setting multiple arc-shaped plates, when the stirring shaft and multiple stirring rods stir the wastewater, flocculant, and coagulant, the multiple arc-shaped plates alternately block the arc-shaped opening of the outlet pipe. When the arc-shaped plate blocks the arc-shaped opening of the outlet pipe, the wastewater will not be output through the outlet pipe. When the arc-shaped plate leaves the arc-shaped opening of the outlet pipe, the wastewater is output through the outlet pipe, which prolongs the time that the wastewater stays in the mixing tank, so that the wastewater, flocculant, and coagulant are fully mixed.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: by shoveling up and discharging the scum agglomerates, the scum agglomerates are prevented from being broken up and will not detach from the air bubbles and sink, thus improving the scum removal efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural schematic diagram of the shovel groove of the present invention in the right-hand state; Figure 3 This is a front cross-sectional view of the shovel groove of the present invention in the right-side state; Figure 4 This is a front cross-sectional view of the shovel groove of the present invention in the left-side state; Figure 5 This is a schematic diagram of the rear-view axonometric structure of the present invention; Figure 6 This is a schematic diagram of the isometric structure of the present invention; Figure 7 This is a schematic diagram of the drug mixing mechanism; Figure 8 It is a structural diagram of the internal partition, liquid outlet pipe, motor, stirring shaft, stirring rod and arc plate, etc. Figure 9 It is a structural diagram of the shovel groove, shovel plate, water filter hole, slide rail, slider frame, pushing component and moving partition plate, etc. Figure 10 It is a structural diagram of the aerosol tank, water delivery pipe, air pump pipe, water pump, return water pipe, air inlet pipe and inner tank, etc. The following components are labeled in the attached diagram: 1. Main chamber; 2. Mixing mechanism; 3. Aerosol tank; 4. Water supply pipe; 5. Air pump pipe; 6. Water pump; 7. Return water pipe; 8. Shovel groove; 9. Sludge suction pipe; 10. Shovel plate; 11. Filter hole; 12. Slide rail; 13. Sliding block frame; 14. Pushing component; 15. Moving partition; 16. Fixed partition; 17. Sludge discharge pipe one; 18. Sludge discharge pipe two; 19. Air inlet pipe; 20. Inner liner; 21. Pressure sensor; 22. Mixing tank; 23. Inner partition; 24. Wastewater pipe; 25. Dosing pipe one; 26. Dosing pipe two; 27. Liquid outlet pipe; 28. Motor; 29. ​​Stirring shaft; 30. Stirring rod; 31. Arc plate. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0019] Example 1, such as Figures 1 to 6 , Figure 9 and Figure 10 As shown, a dissolved air flotation machine includes a main housing 1, a mixing mechanism 2, an aerosol tank 3, a water delivery pipe 4, an air pump pipe 5, a water pump 6, a return water pipe 7, a shovel 8, and a sludge suction pipe 9. The main housing 1 has an internal chamber. The mixing mechanism 2 is installed in the lower left part of the chamber of the main housing 1. The space above the mixing mechanism 2 is a mixing zone, and the upper part of the mixing zone is the flotation layer. The mixing mechanism 2 is used to mix wastewater with flocculants and coagulants, and to transport the mixture to the mixing zone. The space to the right of the mixing mechanism 2 is a sedimentation zone. The aerosol tank 3 is installed... Outside the main housing 1, an aerosol tank 3 is used to mix clean water with high-pressure air to form aerosol water. The inlet end of the water supply pipe 4 extends into the interior of the aerosol tank 3, and the outlet end of the water supply pipe 4 is equipped with a pump pipe 5. The pump pipe 5 is installed at the bottom of the mixing zone. A water pump 6 is installed on the right side of the main housing 1. The pump pipe of the water pump 6 extends into the middle of the sedimentation zone. The inlet end of the return water pipe 7 is connected to one outlet of the water pump 6, and the outlet end of the return water pipe 7 extends into the interior of the aerosol tank 3. A shovel 8 is movably installed on the upper part of the chamber of the main housing 1. The left end of the shovel 8 extends into the air flotation chamber. In this layer, a slag suction pipe 9 is installed on the main housing 1, with its input end extending between the shovel groove 8 and the top wall of the main housing 1; it also includes a shovel plate 10, which is installed on the left end of the shovel groove 8, with the middle of the shovel plate 10 protruding upwards and the left end of the shovel plate 10 extending downwards to below the air flotation layer; the left side of the shovel plate 10 is provided with multiple filter holes 11; it also includes two slide rails 12, multiple slider brackets 13, and two pushing components 14, with the two slide rails 12 respectively installed on the front and rear inner walls of the main housing 1, and the multiple slider brackets 13 installed on the shovel groove 8, and the multiple slider brackets 14... 3 is slidably connected to two slide rails 12 respectively, and the fixed ends of the two pushing components 14 are mounted on the slider frame 13. The piston rods of the two pushing components 14 are connected to the main box 1. It also includes an air inlet pipe 19, an inner liner 20 and a pressure sensor 21. The inner liner 20 is installed inside the aerosol can 3. An air gap is set between the inner liner 20 and the interior of the aerosol can 3. The output end of the air inlet pipe 19 extends into the air gap. Multiple micro-pores are set on the inner liner 20. The pressure sensor 21 is installed on the aerosol can 3. The probe of the pressure sensor 21 extends into the interior of the aerosol can 3.

[0020] The shovel 8 is slidably mounted on two slide rails 12 via multiple slider brackets 13. The piston rods of the two pushing components 14 extend or shorten, causing the shovel 8 to move left and right, enabling it to scoop up flocs and aggregates in the air flotation layer and return to its rightward position. The sludge suction pipe 9 is connected to an external vacuum pump. During operation, the shovel 8 moves above the sedimentation zone of the main tank 1, and wastewater is input into the mixing mechanism 2. After the addition of flocculants and coagulants, the dissolved substances in the wastewater form flocs and aggregates that precipitate out. The wastewater containing flocculants and aggregates is input into the air mixing zone of the main tank 1, where it mixes with the dissolved water containing a large amount of air output from the pump air pipe 5. The dissolved water is depressurized, and the air in it forms a large number of microbubbles that precipitate out and adsorb flocculants and coagulants in the wastewater. These flocculants and coagulants then aggregate and float to the flotation layer. The clear water below the flotation layer flows into the sedimentation zone. The clear water in the middle of the sedimentation zone is pumped out by pump 6. Part of the clear water is sent to the subsequent treatment system, and the other part is input into the dissolved water tank 3 through the return water pipe 7. The air inlet pipe 19 is connected to an external high-pressure air system. High-pressure air is input through the air inlet pipe 19 into the air gap between the inner tank 20 and the dissolved water tank 3. The high-pressure air then forms microbubbles through multiple micropores in the inner tank 20 and quickly dissolves into the clear water inside the dissolved water tank 3. In water, to improve the efficiency of forming aerated water, pressure sensor 21 detects the pressure inside aerated tank 3 and adjusts the opening and closing of air inlet pipe 19 according to the pressure value to keep the pressure stable. Aerated water is input into pump pipe 5 through water delivery pipe 4 to form a clean water recycling process. When the bottom of the flocs and agglomerates accumulated in the flotation layer is slightly higher than the bottom of the left end of shovel plate 10, when shovel groove 8 moves to the left, the left part of shovel plate 10 scoops up the flocs and agglomerates floating in the flotation layer. This allows the flocs and agglomerates to be scooped up along the left part of shovel plate 10 and pass over the protrusion into the top of shovel groove 8, improving the efficiency of scooping up flocs and agglomerates and blocking the shovel groove 8 from the top. The process avoids the flocs and agglomerates overflowing from the shovel trough 8. As the flocs and agglomerates are scooped up along the left side of the shovel plate 10, the mixed wastewater is filtered out through multiple filter holes 11, reducing the discharge of mixed wastewater. This allows the flocs and agglomerates to be collected as a whole at the top of the shovel trough 8. The vacuum pump operates to discharge the flocs and agglomerates from the shovel trough 8 into the main tank 1 for further processing through the slag suction pipe 9. After the flocs and agglomerates are discharged, the shovel trough 8 returns to its right position. Compared with the prior art, by scooping up and discharging the scum agglomerates, the scum agglomerates are prevented from being broken up and will not detach from the air bubbles and sink, thus improving the scum removal efficiency.

[0021] Example 2, as Figures 1 to 4 , Figure 9As shown, based on Embodiment 1, it also includes a movable baffle 15, which is installed on the right side of the lower end face of the shovel 8. When the shovel 8 is located in the mixing zone of the main box 1, the lower end face of the movable baffle 15 is in contact with the upper end face of the mixing mechanism 2, and the water pump 6's pumping pipe is located on the right side of the movable baffle 15. It also includes a fixed baffle 16, a mud discharge pipe 17, and a mud discharge pipe 18. The fixed baffle 16 is installed on the lower right side of the sedimentation zone of the main box 1. When the shovel 8 is located in the sedimentation zone, the top of the fixed baffle 16 is aligned with the movable baffle 15. A clear water channel is provided between the top of the fixed baffle 16 and the movable baffle 15. The input ends of the mud discharge pipe 17 and the mud discharge pipe 18 both extend into the bottom of the sedimentation zone of the main box 1. The mud discharge pipe 17 and the mud discharge pipe 18 are located on the left and right sides of the fixed baffle 16, respectively.

[0022] When the shovel 8 is located in the sedimentation zone of the main tank 1, the movable baffle 15 separates the water pump 6's pumping pipe from the sedimentation zone, preventing the sediment from being pumped out by the water pump 6, thus improving the purity of the clear water and the sedimentation efficiency. The sediment in the sedimentation zone settles to the left and right sides of the fixed baffle 16, with most of the sediment gathering on the left side of the fixed baffle 16 and being discharged through the sludge discharge pipe 17, while a small portion settles on the right side of the fixed baffle 16 and is discharged through the sludge discharge pipe 18, thus improving the sedimentation and sludge removal efficiency. When the shovel 8 is located in the air-mixing zone of the main tank 1 and scoops up flocs and agglomerates, the lower end of the movable baffle 15 contacts the mixing mechanism 2, thereby separating the air-mixing zone from the sedimentation zone, preventing flocs and agglomerates from overflowing into the sedimentation zone, and improving the removal efficiency of flocs and agglomerates.

[0023] Example 3, as Figures 1 to 4 , Figure 7 and Figure 8As shown, based on Embodiment 1, the mixing mechanism 2 includes a mixing tank 22, an inner partition 23, a wastewater pipe 24, a first dosing pipe 25, a second dosing pipe 26, and a second dosing pipe 27. The mixing tank 22 is installed in the lower left part of the main tank 1. The mixing tank 22 has a mixing chamber inside. The inner partition 23 is installed in the middle of the mixing chamber of the mixing tank 22. The inner partition 23 has multiple liquid passage holes and divides the mixing chamber into a flocculation chamber and a coagulation chamber. The wastewater pipe 24 passes through the main tank 1 and extends into the flocculation chamber of the mixing tank 22. The first dosing pipe 25 passes through the main tank 1 and extends into the flocculation chamber of the mixing tank 22. The second dosing pipe 26 passes through the main tank 1 and extends into the coagulation chamber of the mixing tank 22. The outlet pipe 27 is installed in the mixing tank. On the 22, the input end of the liquid outlet pipe 27 extends into the interior of the coagulation chamber, and the air pump pipe 5 is located to the right of the output end of the liquid outlet pipe 27; it also includes a motor 28, a stirring shaft 29, and multiple stirring rods 30. The motor 28 is installed outside the main housing 1, and the stirring shaft 29 is rotatably installed in the mixing chamber of the mixing mechanism 2. The end of the stirring shaft 29 is connected to the output shaft of the motor 28. Multiple stirring rods 30 are installed on the outer wall of the stirring shaft 29, and the multiple stirring rods 30 are respectively located in the flocculation chamber and the coagulation chamber of the mixing box 22; it also includes multiple arc-shaped plates 31, which are evenly installed on the stirring shaft 29 circumferentially. The input end of the liquid outlet pipe 27 is provided with an arc-shaped opening, and the multiple arc-shaped plates 31 alternately block the arc-shaped opening of the liquid outlet pipe 27.

[0024] Wastewater is fed into the flocculation chamber of the mixing tank 22 through wastewater pipe 24. Flocculant is fed into the flocculation chamber through dosing pipe 25 and mixes with the wastewater to cause dissolved harmful substances in the wastewater to flocculate and precipitate. The flocs flow into the coagulation chamber of the mixing tank 22 through the liquid passage holes of the inner partition 23. Coagulant is fed into the coagulation chamber through dosing pipe 26 and mixes with the wastewater, causing the flocs to agglomerate. Motor 28 drives the stirring shaft 29 and multiple stirring rods 30 to rotate, causing the multiple stirring rods 30 to stir and mix the wastewater, flocculant, and coagulant, improving the mixing uniformity. Wastewater is fed into the mixing zone of the main chamber 1 through the outlet pipe 27. By setting multiple arc-shaped plates 31, when the stirring shaft 29 and multiple stirring rods 30 are stirring the wastewater, flocculant and coagulant, the multiple arc-shaped plates 31 alternately block the arc-shaped opening of the outlet pipe 27. When the arc-shaped plate 31 blocks the arc-shaped opening of the outlet pipe 27, the wastewater will not be output through the outlet pipe 27. When the arc-shaped plate 31 leaves the arc-shaped opening of the outlet pipe 27, the wastewater is output through the outlet pipe 27, which prolongs the time that the wastewater stays in the mixing tank 22, so that the wastewater, flocculant and coagulant are fully mixed.

[0025] like Figures 1 to 10As shown, in the dissolved air flotation machine of the present invention, during operation, the shovel 8 first moves to the top of the sedimentation zone of the main tank 1, and wastewater is input into the mixing mechanism 2. After the addition of flocculants and coagulants, the dissolved substances in the wastewater form flocs and coagulants that precipitate out. The wastewater containing flocs and coagulants is input into the mixing zone of the main tank 1, where it mixes with dissolved air containing a large amount of air output from the air pump pipe 5. The dissolved air is depressurized, and the air in it forms a large number of microbubbles that precipitate out and adsorb the flocs and coagulants in the wastewater. The flocs and coagulants then aggregate into clumps and float to the flotation layer. Afterward, the clear water below the flotation layer flows into the sedimentation zone. The sediment in the sedimentation zone settles to the left and right sides of the baffle plate 16, with most of the sediment settling to the left side of the baffle plate 16 and being discharged through the sludge discharge pipe 17. A small portion of the sediment settles to the right side of the baffle plate 16 and... The sludge is discharged through the sludge discharge pipe 18. Then, the clear water in the middle of the sedimentation zone is pumped out by the water pump 6. Part of the clear water is sent to the subsequent treatment system, and the other part is input into the aerosol tank 3 through the return water pipe 7 to mix with high-pressure air to form aerosol water. The aerosol water is input into the pump air pipe 5 through the water supply pipe 4 to form the recycling of clear water. When the flocs and agglomerates that have accumulated in the flotation layer reach the specified thickness, the two pushing parts 14 drive the shovel 8 to move to the left. The left side of the shovel plate 10 shovels up the flocs and agglomerates floating in the flotation layer, so that the flocs and agglomerates are shoveled up along the left side of the shovel plate 10 and pass over the protrusion into the top of the shovel 8. The mixed wastewater is filtered out through multiple water filter holes 11. Finally, the vacuum pump runs and discharges the flocs and agglomerates on the shovel 8 into the main tank 1 for subsequent treatment through the sludge suction pipe 9. After the flocs and agglomerates are discharged, the shovel 8 can be reset to the right.

[0026] The main functions achieved by this invention are: 1. By shoveling up and discharging the scum aggregates, the scum aggregates are prevented from being broken up and will not detach from the air bubbles and sink, thus improving the efficiency of scum removal. 2. As the flocs and aggregates are scooped up along the left side of the shovel plate 10, the mixed wastewater is filtered out through multiple filter holes 11, reducing the discharge of mixed wastewater and improving the removal efficiency of flocs and aggregates. 3. A movable baffle 15 is installed to separate the water pump 6's pumping pipe from the sedimentation zone, preventing the sediment from being pumped out by the water pump 6, thus improving the purity of the water and the sedimentation efficiency. When the shovel 8 is located in the air-mixing zone of the main box 1 and shovels up flocs and agglomerates, the lower end of the movable baffle 15 contacts the mixing mechanism 2, thereby separating the air-mixing zone from the sedimentation zone, preventing flocs and agglomerates from overflowing into the sedimentation zone, and improving the removal efficiency of flocs and agglomerates. 4. High-pressure air passes through multiple micro-pores in the inner liner 20 to form micro-bubbles that quickly dissolve into the clear water inside the aerosol tank 3, improving the efficiency of aerosol water formation. 5. It can prolong the residence time of wastewater in the mixing tank 22, so that the wastewater, flocculant and coagulant are fully mixed.

[0027] The dissolved air flotation machine of this invention uses common mechanical methods for installation, connection, or setup, and can be implemented as long as it achieves the beneficial effects. The main body 1, mixing mechanism 2, dissolved air tank 3, air pump pipe 5, water pump 6, sludge suction pipe 9, slide rail 12, pushing component 14, sludge discharge pipe one 17, sludge discharge pipe two 18, air inlet pipe 19, inner tank 20, pressure sensor 21, mixing tank 22, dosing pipe one 25, dosing pipe two 26, motor 28, stirring shaft 29, and stirring rod 30 of the dissolved air flotation machine of this invention are commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0028] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dissolved air flotation machine, comprising a main housing (1), wherein the main housing (1) has a chamber disposed therein; characterized in that, It also includes a mixing mechanism (2), an aerosol tank (3), a water delivery pipe (4), a pumping pipe (5), a water pump (6), a return water pipe (7), a shovel trough (8), and a sludge suction pipe (9); The mixing mechanism (2) is installed in the lower left part of the chamber of the main box (1). The space above the mixing mechanism (2) is set as the gas mixing zone. The upper part of the gas mixing zone is the air flotation layer. The mixing mechanism (2) is used to mix wastewater with flocculant and coagulant to form a mixed liquid and transport the mixed liquid to the gas mixing zone. The space on the right side of the mixing mechanism (2) is set as the sedimentation zone. The aerosol tank (3) is installed outside the main body (1). The aerosol tank (3) is used to mix clean water with high-pressure air to form aerosol water. The input end of the water supply pipe (4) extends into the interior of the aerosol tank (3). The output end of the water supply pipe (4) is equipped with the air pump pipe (5). The air pump pipe (5) is installed at the bottom of the mixing zone. The water pump (6) is installed on the right side of the main body (1). The water pump (6)'s suction pipe extends into the middle of the sedimentation zone. The input end of the return water pipe (7) is connected to one of the outlets of the water pump (6). The output end of the return water pipe (7) extends into the interior of the aerosol tank (3). The shovel groove (8) is slidably installed on the upper part of the chamber of the main box (1). The left end of the shovel groove (8) extends into the air flotation layer. The slag suction pipe (9) is installed on the main box (1). The input end of the slag suction pipe (9) extends between the shovel groove (8) and the top wall of the main box (1).

2. The dissolved air flotation machine as described in claim 1, characterized in that, A shovel plate (10) is installed on the left end of the shovel groove (8). The middle part of the shovel plate (10) protrudes upward, and the left end of the shovel plate (10) extends downward to the bottom of the air flotation layer. Multiple filter holes (11) are provided on the left side of the shovel plate (10).

3. The dissolved air flotation machine as described in claim 1, characterized in that, It also includes two slide rails (12), multiple slider frames (13) and two push components (14). The two slide rails (12) are respectively installed on the front and rear inner walls of the main box (1). The multiple slider frames (13) are installed on the shovel groove (8). The multiple slider frames (13) are slidably connected to the corresponding slide rails (12). The fixed ends of the two push components (14) are installed on the slider frames (13). The piston rods of the two push components (14) are connected to the main box (1).

4. The dissolved air flotation machine as described in claim 1, characterized in that, It also includes a movable partition (15), which is installed on the lower end face of the shovel groove (8). When the shovel groove (8) is located in the gas mixing zone, the lower end face of the movable partition (15) contacts the upper end face of the mixing mechanism (2), and the water pump (6)'s pumping pipe is located on the right side of the movable partition (15).

5. A dissolved air flotation machine as described in claim 4, characterized in that, It also includes a fixed baffle (16), a sludge discharge pipe 1 (17) and a sludge discharge pipe 2 (18). The fixed baffle (16) is installed in the lower right part of the sedimentation zone of the main tank (1). When the shovel trough (8) is located in the sedimentation zone, the top of the fixed baffle (16) is aligned with the moving baffle (15). A clear water channel is set between the top of the fixed baffle (16) and the moving baffle (15). The input ends of the sludge discharge pipe 1 (17) and the sludge discharge pipe 2 (18) extend into the bottom of the sedimentation zone of the main tank (1). The sludge discharge pipe 1 (17) and the sludge discharge pipe 2 (18) are located on the left and right sides of the fixed baffle (16), respectively.

6. A dissolved air flotation machine as described in claim 1, characterized in that, It also includes an air inlet pipe (19), an inner liner (20) and a pressure sensor (21). The inner liner (20) is installed inside the aerosol can (3). An air gap is provided between the inner liner (20) and the interior of the aerosol can (3). The output end of the air inlet pipe (19) extends into the air gap. Multiple micro-pores are provided on the inner liner (20). The pressure sensor (21) is installed on the aerosol can (3). The probe of the pressure sensor (21) extends into the interior of the aerosol can (3).

7. A dissolved air flotation machine as described in claim 1, characterized in that, The mixing mechanism (2) includes a mixing tank (22), an inner partition (23), a wastewater pipe (24), a first dosing pipe (25), a second dosing pipe (26), and a second dosing pipe (26). The mixing tank (22) is installed in the lower left part of the main body (1). The mixing tank (22) is equipped with a mixing chamber. The inner partition (23) is installed in the middle of the mixing chamber. Multiple liquid passage holes are provided on the inner partition (23). The inner partition (23) divides the mixing chamber into a flocculation chamber and a coagulation chamber. The wastewater pipe (24) and the first dosing pipe (25) both pass through the main body (1) and extend into the flocculation chamber. The second dosing pipe (26) passes through the main body (1) and extends into the coagulation chamber. The outlet pipe (27) is installed on the mixing tank (22). The input end of the outlet pipe (27) extends into the interior of the coagulation chamber. The air pump pipe (5) is located to the right of the output end of the outlet pipe (27).

8. A dissolved air flotation machine as described in claim 7, characterized in that, It also includes a motor (28), a stirring shaft (29) and multiple stirring rods (30). The motor (28) is installed outside the main housing (1). The stirring shaft (29) is rotatably installed in the mixing chamber. The end of the stirring shaft (29) is connected to the output shaft of the motor (28). Multiple stirring rods (30) are installed on the outer wall of the stirring shaft (29). The multiple stirring rods (30) are located in the flocculation chamber and the coagulation chamber, respectively.

9. A dissolved air flotation machine as described in claim 8, characterized in that, It also includes multiple arc plates (31), which are evenly installed on the stirring shaft (29) along the circumference. An arc opening is provided at the input end of the liquid outlet pipe (27), and multiple arc plates (31) alternately block the arc opening of the liquid outlet pipe (27).

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