Laboratory efficient dissolved air flotation sewage treatment equipment and use method thereof

Abstract

The invention belongs to the technical field of sewage treatment, particularly relates to laboratory efficient dissolved air flotation sewage treatment equipment and a use method thereof, and provides the following scheme aiming at the problems that scum cannot be effectively scraped by a scraper blade when the existing liquid level surface is relatively low, and a flocculating agent added in the later period is accumulated at the top of the scum: the laboratory efficient dissolved air flotation sewage treatment equipment comprises an air flotation box, a sewage liquid inlet pipe is arranged on one side of the air flotation box and used for injecting sewage, a sewage discharge pipe is arranged at one end of the air flotation box and used for discharging treated sewage, a scum discharge port used for discharging scum is formed in one end of the air flotation box and located above the sewage discharge pipe, a collecting box located below the scum discharge port is fixed to one end of the air flotation box, and a water outlet is formed in the other end of the air flotation box. According to the device, through cooperation of the air outlet cylinder, the nozzle and the scum discharging plate, the scum can be automatically gathered towards one side and discharged from salvage, scum removal is effectively completed, a flocculating agent can be automatically injected after scum removal, the flocculating agent is prevented from being accumulated on the scum, and the later sewage treatment efficiency is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a laboratory high-efficiency dissolved air flotation sewage treatment device and a use method thereof. Background Art

[0002] Laboratories are used to conduct various physical and chemical experiments, which usually produce harmful sewage. In order to reduce the harm of harmful sewage to the environment, sewage treatment equipment is usually required to remove harmful substances in sewage before it is discharged. It can only be discharged when it meets the discharge standards. Dissolved air flotation is a technology widely used in laboratory sewage treatment. It can use the different solubility of water under different pressures to produce microbubbles in water under pressurized or negative pressure conditions. These microbubbles can absorb pollutants such as suspended matter, grease and organic matter in sewage, and bring them to the water surface to form scum through buoyancy, thereby achieving separation and removal of pollutants.

[0003] 1. In the prior art, during the scum scraping process, the scum is scraped off by a scraper on a scraper. As the scum is scraped off, the liquid level in the flotation tank begins to drop. When the liquid level in the flotation tank is lower than the discharge port for discharging the scum, the scraper cannot discharge the scum, resulting in the scum being unable to be effectively scraped off; 2. When treating sewage by dissolved air flotation, it is necessary to add sufficient flocculants to the sewage. However, with the injection of flocculants and dissolved water, the scum floats on the sewage surface, and the flocculants added later accumulate on the top of the scum, resulting in the scum being unable to be fully mixed with the sewage, affecting the efficiency of laboratory sewage treatment.

[0004] In view of the above problems, the present invention document proposes a laboratory high-efficiency dissolved air flotation sewage treatment equipment and a method of using the same. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings that the scraper cannot effectively scrape off the scum when the liquid level is low, and the flocculant added later accumulates on the top of the scum, and to propose a laboratory high-efficiency dissolved air flotation sewage treatment equipment and its use method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A laboratory efficient dissolved air flotation sewage treatment equipment, comprising an air flotation tank, one side of the air flotation tank is provided with a sewage inlet pipe for injecting sewage, one end of the air flotation tank is provided with a sewage discharge pipe for discharging treated sewage, one end of the air flotation tank is provided with a slag discharge port for discharging scum, and the slag discharge port is located above the sewage discharge pipe, and one end of the air flotation tank is fixed with a collection box located below the slag discharge port for collecting scum; It also includes a stirring rod rotating in the flotation box, wherein the flotation box is provided with a gas outlet, and a plurality of nozzles are provided on one side of the gas outlet, and the nozzles discharge air obliquely downward, so as to blow and gather the slag on the liquid surface toward the slag discharge port; The reagent box is fixedly arranged on the top of the air flotation box, and a moving platform is slidably arranged on the top of the air flotation box to drive the air outlet cylinder to move and discharge the flocculant; The slag removal structure is arranged at the bottom of the moving platform and is used to drive the gas outlet cylinder to move and remove the slag on the liquid surface; A drug injection structure, arranged in the air flotation tank, for injecting flocculants after the scum is removed; The separation structure is arranged in the collection box and is used to separate the moisture from the collected scum.

[0007] In one possible design, the slag discharge structure includes two connecting arms fixed to the bottom of the moving platform, the bottom ends of the two connecting arms extend into the flotation box and are fixed with mounting rings, the air outlet tube is rotatably sleeved in the two mounting rings, an air pump is fixed to the end of the flotation box away from the slag discharge port, the air outlet end of the air pump is connected to the air outlet tube through a hose, and is used to discharge air to the liquid surface to gather the slag to one side, a slag discharge plate matching the slag discharge port is slidably connected in the flotation box, and is used to discharge the gathered slag through the slag discharge port, and the top inner wall of the flotation box is rotatably connected with two first connecting rods, and the first connecting rods are connected to the outlet The air cylinder cooperates, and the air outlet cylinder is used to push the first connecting rod to rotate. The bottom ends of the two first connecting rods are rotatably connected to the second connecting rod, and the bottom end of the second connecting rod is rotatably connected to the top of the slag discharge plate; the moving platform drives the air outlet cylinder to move, and the air pump injects air into the air outlet cylinder. The air is blown downward obliquely through the nozzle, which can blow the slag on the liquid surface to the top of the slag discharge plate and gather it. The air outlet cylinder touches the first connecting rod and pushes the first connecting rod to rotate counterclockwise. The first connecting rod pulls the slag discharge plate upward through the second connecting rod, and then the slag discharge plate can pick up the slag gathered on the top and discharge it into the collection box through the slag discharge port, thereby completing the slag removal operation.

[0008] In one possible design, the medicine injection structure includes a sliding rod that slides through the top of the flotation tank, the bottom end of the sliding rod is fixed with an extrusion plate located in the flotation tank, the outer wall of the sliding rod is provided with a second spring that is fixedly connected to the top of the extrusion plate, and the top of the second spring is fixedly connected to the top inner wall of the flotation tank, a liquid guiding hose is fixed to the bottom of the medicine box, a medicine storage cavity is provided in the mobile platform, the bottom end of the liquid guiding hose is connected to the medicine storage cavity, and is used to inject flocculant into the medicine storage cavity, two medicine injection tubes are fixed to the bottom of the mobile platform, the medicine injection tubes are connected to the medicine storage cavity, the bottom ends of the two medicine injection tubes extend into the flotation tank, and are used to inject flocculant into the flotation tank, and the bottom inner wall of the medicine box is slidably connected with a liquid guiding hose for sealing the medicine box. A sealing block for the liquid inlet, a sliding plate is fixed on one side of the sealing block, one end of the sliding plate is sealed and slidably extended to one side of the medicine box, an inclined hole is provided in the sliding plate and is located on the outside of the medicine box, a pin rod is slidably fitted in the inclined hole, and the pin rod is fixed in the sliding rod, and the cooperation between the pin rod and the inclined hole drives the sliding plate to move outward; the extrusion plate drives the sliding rod to move upward synchronously, and the cooperation between the pin rod and the inclined hole drives the sliding plate and the sealing block to move outward, thereby releasing the blockage of the liquid guiding hose, and the flocculant in the medicine box flows into the medicine storage cavity in the mobile platform through the liquid guiding hose and is discharged through the medicine injection tube. As the mobile platform moves, the contact range of the flocculant and the sewage can be increased, so that the flocculant can fully react with the sewage, thereby improving the flocculation efficiency and the later sewage treatment efficiency.

[0009] In a possible design, the separation structure includes a concave filter screen fixed in the collection box for filtering scum, a traction rod slidingly penetrates the concave filter screen, a pressing plate is fixed on the top of the traction rod for squeezing the scum on the concave filter screen, the bottom end of the traction rod seals and slides through the collection box and is fixed with a moving frame, one end of the stirring rod seals and rotates to extend to one end of the flotation box and is fixed with a turntable, a pin is fixed on the side of the turntable deviating from the center of the circle, and the pin extends into the moving frame and slidably cooperates with the moving frame, and the turntable is driven by the cooperation of the pin and the moving frame The movable pressing plate reciprocates up and down, a return pipe is fixed at the bottom of the collecting box, and the bottom end of the return pipe is connected to the sewage pipe for discharging the separated sewage; the reciprocating screw drives the stirring rod to rotate through the sprocket and the chain, which is not only used to stir the sewage and accelerate the mixing of sewage, flocculant and aerosol water, but also can drive the turntable and the pin to rotate. The cooperation of the pin and the moving frame can drive the traction rod and the pressing plate to reciprocate up and down, and the pressing plate can squeeze the scum in the middle of the concave filter screen to complete the separation of the scum and water, and the separated water flows into the sewage pipe through the return pipe for discharge.

[0010] In a possible design, a reciprocating screw is rotatably connected to the top of the flotation box through a base, one end of the reciprocating screw is threaded through the moving platform, a driving motor is fixed to the top of the flotation box, and the output shaft of the driving motor is fixedly connected to one end of the reciprocating screw through a coupling, a guide rod is fixed to the top of the flotation box through the base, and one end of the guide rod slides through the moving platform, and the stirring rod is sealed and rotatably extended to one side of the flotation box at one end away from the turntable and is connected to the reciprocating screw through a sprocket and a chain transmission; the driving motor drives the reciprocating screw to rotate to drive the moving platform to move and remove the scum, and the reciprocating screw drives the stirring rod to rotate through the sprocket and the chain, which can not only stir the sewage and accelerate the mixing of the sewage, flocculant and aerosol water, but also complete the water separation operation of the scum on the concave filter screen.

[0011] In a possible design, rectangular holes are provided on both sides of the air flotation box away from each other, and trapezoidal sliding bars are slidably connected in the two rectangular holes. Multiple first springs are fixed to the sides of the two trapezoidal sliding bars away from each other, and multiple blocks are fixed on both sides of the air flotation box, and one end of the first spring away from the trapezoidal sliding bar is fixedly connected to the block for making way for the trapezoidal sliding bar. Load-bearing rods are fixed on both sides of the bottom of the air outlet bag, and the load-bearing rods are used to keep the nozzle in an inclined state. The load-bearing rods cooperate with the inclined surfaces of the trapezoidal sliding bars to squeeze the trapezoidal sliding bars into the rectangular holes, and the load-bearing rods and the straight surfaces of the trapezoidal sliding bars close to one end of the collection box are connected. The angle surfaces cooperate to drive the punching bag to rotate counterclockwise. A pushing rod is fixed on one side of the punching bag, and the pushing rod cooperates with the extrusion plate to drive the extrusion plate to move up; the moving platform drives the punching bag to move, and when the punching bag moves to the position of the trapezoidal sliding bar, the load-bearing rod cooperates with the inclined surface of the trapezoidal sliding bar to squeeze the trapezoidal sliding bar outward, and the first spring is in a compressed state. When the punching bag is reset, the load-bearing rod touches one end of the trapezoidal sliding bar, driving the punching bag to rotate counterclockwise, and the punching bag drives the pushing rod to rotate. As the punching bag moves, the pushing rod touches the extrusion plate and pushes the extrusion plate upward, thereby being able to discharge the flocculant in the medicine box into the flotation tank.

[0012] In a possible design, an air dissolving tank is placed at one end of the flotation tank away from the slag discharge port through an L-shaped plate, a water inlet pipe is fixed to one end of the air dissolving tank, one end of the water inlet pipe extends into the flotation tank, and two connecting pipes are provided on the outer wall of the air dissolving tank, and the two connecting pipes are respectively matched with a water pump and an air compressor to inject clean water and air into the air dissolving tank to prepare aerosol water.

[0013] In a possible design, the nozzle is inclined at an angle of 20°-30° to gather the slag on the liquid surface to the top of the slag discharge plate.

[0014] In a possible design, multiple mounting plates are fixed to the bottom of the slag discharge plate, and multiple hemispherical protrusions are fixed on one side of the mounting plates close to the collecting box, and multiple knocking rods are fixed on one side of the concave filter screen, and one end of the multiple knocking rods are sealed and slidably extended into the flotation box, and one end of the knocking rod is spherical and cooperates with the hemispherical protrusions to vibrate the concave filter screen through the knocking rods; when the slag discharge plate moves up, the slag discharge plate drives the mounting plate to move synchronously, and the mounting plate can continuously vibrate the concave filter screen through the cooperation of the hemispherical protrusions and the knocking rods, and can shake the scum on the concave filter screen to the middle, which is convenient for the later pressing plate to squeeze out the moisture in the scum.

[0015] In this application, a method for using a laboratory efficient dissolved air flotation wastewater treatment device comprises the following steps: S1. Inject the sewage to be treated and the flocculant into the flotation tank, stir to make the sewage flocculate; at the same time, inject clean water and air into the air dissolving tank to form aerosol water, and inject it into the flotation tank to make the scum in the sewage float on the liquid surface; S2, the driving motor drives the reciprocating screw to rotate, so that the air outlet cylinder moves; the air pump injects air into the air outlet cylinder, and blows it obliquely downward through the nozzle, so that the scum on the liquid surface is blown to the top of the slag discharge plate to gather; when the air outlet cylinder moves to a specific position, the air outlet cylinder pushes the first connecting rod to pull the slag discharge plate upward, picks up the slag, and discharges it into the collection box through the slag discharge port, completing the slag removal; S3. When the slag discharge plate moves up, it drives the mounting plate to move synchronously, causing the concave filter screen to vibrate and shake off the slag on the filter screen for subsequent processing; S4. When the reciprocating screw rotates, the sprocket and chain drive the stirring rod to rotate, accelerating the mixing of sewage, flocculant and aerosol water, and driving the pressing plate to move up and down to squeeze the scum in the middle of the concave filter screen to separate the scum from the water. The separated water is discharged through the reflux pipe; S5. After the slag discharge is completed, the flocculant is discharged into the flotation tank to allow the flocculant to fully react with the sewage; the reciprocating screw drives the air outlet cylinder to reset, and the blockage of the liquid guide hose is released through a series of connecting rod mechanisms. The flocculant in the medicine box flows into the medicine storage cavity in the mobile platform and is discharged through the medicine injection pipe, which increases the contact range between the flocculant and the sewage, and improves the flocculation efficiency and sewage treatment efficiency.

[0016] Beneficial effects: In the present invention, an air outlet is provided in the air flotation box, a slag discharge plate is slidably connected in the air flotation box, the top inner wall of the air flotation box is rotatably connected to two first connecting rods, the bottom ends of the two first connecting rods are rotatably connected to the second connecting rod, and the bottom end of the second connecting rod is rotatably connected to the top of the slag discharge plate; the moving platform drives the air outlet to move, and air is blown obliquely downward through the nozzle to blow and gather the slag on the liquid surface to the top of the slag discharge plate, the air outlet touches the first connecting rod and pushes the first connecting rod to rotate counterclockwise, the first connecting rod pulls the slag discharge plate upward through the second connecting rod, and then the slag discharge plate can pick up the slag gathered on the top, completing the slag removal operation; In the present invention, trapezoidal sliding bars are slidably connected in the two rectangular holes, load-bearing bars are fixed on both sides of the bottom of the punching bag, and a pushing rod is fixed on one side of the punching bag; when the punching bag is reset, the load-bearing bar touches one end of the trapezoidal sliding bar, driving the punching bag to rotate counterclockwise, and the punching bag drives the pushing rod to rotate, and as the punching bag moves, the pushing rod touches the extrusion plate and pushes the extrusion plate upward, so that the flocculant in the medicine box can be discharged into the flotation box, and the flocculant is automatically discharged after the scum is removed, so as to avoid the flocculant from accumulating on the scum, so that the flocculant can fully react with the sewage; In the present invention, the medicine injection structure includes a sliding rod that slides through the top of the flotation tank, an extrusion plate is fixed to the bottom end of the sliding rod, the bottom of the medicine box is connected to the medicine storage cavity in the mobile platform through a liquid guiding hose, and two medicine injection tubes are fixed to the bottom of the mobile platform, and a blocking block is slidably connected to the bottom inner wall of the medicine box, and a sliding plate is fixed to one side of the blocking block, and an inclined hole is provided in the sliding plate, and a pin rod is slidably matched in the inclined hole, and the pin rod is fixed in the sliding rod; the extrusion plate drives the sliding rod to move upward synchronously, drives the sliding plate to move outward, releases the blockage of the liquid guiding hose, and then discharges the flocculant into the flotation tank, increases the contact range between the flocculant and the sewage, enables the flocculant to fully react with the sewage, and improves the flocculation efficiency; In the present invention, a concave filter is fixed in the collecting box, a traction rod is slidably penetrated in the concave filter, a pressing plate is fixed on the top end of the traction rod, a moving frame is fixed on the bottom end of the traction rod, and a pin is fixed on the side of the turntable deviating from the center of the circle; the reciprocating screw drives the stirring rod to rotate through the sprocket and the chain, which is not only used to stir the sewage and accelerate the mixing of the sewage, flocculant and aerosol water, but also can drive the turntable and the pin to rotate. The cooperation of the pin and the moving frame can drive the traction rod and the pressing plate to move back and forth up and down, and the pressing plate can squeeze the scum in the middle of the concave filter to complete the separation of the scum and water, and the separated water flows into the sewage pipe through the reflux pipe for discharge.

[0017] In the present invention, the cooperation of the air outlet tube, the nozzle and the slag discharge plate can automatically gather the scum to one side and discharge it through salvage, so that the scum is effectively removed. After the scum is removed, the flocculant can be automatically injected to avoid the flocculant from accumulating on the scum, thereby ensuring the efficiency of the later sewage treatment. In addition, the stirring rod can also discharge the water in the scum when stirring the sewage to accelerate the mixing of the sewage, the flocculant and the aerosol water, thereby improving the sewage treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of a three-dimensional structure from a first perspective of a laboratory high-efficiency dissolved air flotation sewage treatment device provided in Example 1 of the present invention; Figure 2 A schematic diagram of the three-dimensional structure from a second perspective of a laboratory high-efficiency dissolved air flotation sewage treatment device provided in Example 1 of the present invention; Figure 3 A three-dimensional cross-sectional structural schematic diagram of a laboratory high-efficiency dissolved air flotation sewage treatment equipment provided in Example 1 of the present invention; Figure 4 A schematic diagram of the main cross-sectional structure of a laboratory high-efficiency dissolved air flotation sewage treatment equipment provided in Example 1 of the present invention; Figure 5 A schematic diagram of a three-dimensional exploded structure of a moving platform, a guide rod and a reciprocating screw rod of a laboratory high-efficiency dissolved air flotation sewage treatment equipment provided by Example 1 of the present invention; Figure 6 A schematic diagram of the three-dimensional structure of the gas outlet tube, the first connecting rod and the second connecting rod of a laboratory high-efficiency dissolved air flotation sewage treatment equipment provided by Example 1 of the present invention; Figure 7 A schematic diagram of a three-dimensional exploded cross-sectional structure of a collection box and a sliding plate of a laboratory high-efficiency dissolved air flotation sewage treatment device provided in Example 1 of the present invention; Figure 8 A schematic diagram of a three-dimensional exploded structure of a load-bearing rod, a push rod, a trapezoidal sliding bar and an extrusion plate of a laboratory high-efficiency dissolved air flotation sewage treatment equipment provided by Example 1 of the present invention; Fig. 9 A three-dimensional exploded schematic diagram of a reagent box, a sliding plate and a second spring of a laboratory high-efficiency dissolved air flotation sewage treatment device provided by Example 1 of the present invention, and an enlarged schematic diagram of a sliding rod, a sliding plate, an inclined hole and a pin rod; Fig.10 A schematic diagram of the three-dimensional structure of a dissolved air tank and a water inlet pipe of a laboratory high-efficiency dissolved air flotation wastewater treatment device provided in Example 1 of the present invention; Fig.11 A schematic diagram of the main cross-sectional structure of a laboratory high-efficiency dissolved air flotation sewage treatment equipment provided by Example 2 of the present invention; Fig.12 This is a schematic diagram of a three-dimensional sectional explosion structure of a collection box, a knocking rod and a mounting plate of a laboratory high-efficiency dissolved air flotation sewage treatment equipment provided in Example 2 of the present invention.

[0019] In the figure: 1, air flotation box; 2, moving platform; 3, guide rod; 4, reciprocating screw rod; 5, driving motor; 6, stirring rod; 7, connecting arm; 8, mounting ring; 9, air outlet; 10, nozzle; 11, collecting box; 12, concave filter; 13, slag outlet; 14, air pump; 15, slag plate; 16, first connecting rod; 17, second connecting rod; 18, mounting plate; 19, hemispherical bump; 20, knocking rod; 21, rectangular hole; 22, trapezoidal sliding bar; 23, stopper; 2 4. First spring; 25. Load-bearing rod; 26. Push rod; 27. Extrusion plate; 28. Sliding rod; 29. ​​Second spring; 30. Medicine box; 31. Liquid guiding hose; 32. Medicine injection tube; 33. Blocking block; 34. Sliding plate; 35. Oblique hole; 36. Pin rod; 37. Turntable; 38. Pin column; 39. Pressing plate; 40. Pulling rod; 41. Moving frame; 42. Reflux pipe; 43. Sewage inlet pipe; 44. Drain pipe; 45. Air dissolving tank; 46. Water inlet pipe. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1 Reference Figure 1-Figure 4 , sewage treatment equipment, which is used in the field of air flotation, mainly includes an air flotation tank 1, and a sewage inlet pipe 43 is provided on one side of the air flotation tank 1 for injecting sewage. A sewage discharge pipe 44 is provided at one end of the air flotation tank 1 for discharging treated sewage. A slag discharge port 13 for discharging slag is provided at the other end of the air flotation tank 1, and the slag discharge port 13 is located above the sewage discharge pipe 44. Below the slag discharge port 13, a collection box 11 is fixed at one end of the air flotation tank 1 for collecting slag.

[0022] Reference Figure 1-Figure 4 In the flotation tank 1, a rotatable stirring rod 6 is provided for stirring the sewage. At the same time, an air outlet 9 is also provided in the flotation tank 1, and a plurality of nozzles 10 are provided on one side of the air outlet 9. These nozzles 10 discharge air obliquely downward to blow and gather the scum on the liquid surface toward the scum discharge port 13. The reagent box 30 is fixedly arranged on the top of the flotation tank 1 for storing flocculants. A moving platform 2 is also slidably provided on the top of the flotation tank 1, and the moving platform 2 is used to drive the air outlet 9 to move and discharge the flocculants.

[0023] Reference Figure 2-Figure 6, the slag discharge structure is arranged at the bottom of the mobile platform 2, and is used to drive the air outlet 9 to move and remove the slag on the liquid surface. Specifically, the slag discharge structure includes two connecting arms 7 fixed at the bottom of the mobile platform 2, and the bottom ends of the two connecting arms 7 extend into the flotation box 1 and are fixed with mounting rings 8. The air outlet 9 is rotatably sleeved in the two mounting rings 8 and can move with the movement of the mobile platform 2. An air pump 14 is fixed at one end of the flotation box 1 away from the slag discharge port 13, and the air outlet end of the air pump 14 is connected to the air outlet 9 through a hose, which is used to discharge air to the liquid surface to gather the slag to one side. A slag discharge plate 15 that cooperates with the slag discharge port 13 is also slidably connected in the flotation box 1, which is used to discharge the gathered slag through the slag discharge port 13. Two first connecting rods 16 are rotatably connected to the top inner wall of the flotation box 1, and the first connecting rods 16 cooperate with the air outlet 9. The air outlet 9 can push the first connecting rod 16 to rotate during the movement. The bottom ends of the two first connecting rods 16 are rotatably connected to the second connecting rod 17 , and the bottom ends of the second connecting rod 17 are rotatably connected to the top of the slag discharge plate 15 .

[0024] Specifically, when the moving platform 2 drives the air outlet cylinder 9 to move, the air pump 14 injects air into the air outlet cylinder 9, and the air is blown obliquely downward through the nozzle 10, blowing the scum on the liquid surface to the top of the slag discharge plate 15 and gathering. During the movement, the air outlet cylinder 9 touches the first connecting rod 16 and pushes the first connecting rod 16 to rotate counterclockwise, and the first connecting rod 16 pulls the slag discharge plate 15 upward through the second connecting rod 17. The slag discharge plate 15 picks up the scum gathered on the top and discharges it into the collection box 11 through the slag discharge port 13, completing the scum removal operation.

[0025] Reference Figure 3 , Figure 4 , Figure 8 and Fig. 9, the injection structure is arranged in the flotation tank 1, and is used to inject flocculants after the scum is removed. Specifically, the injection structure includes a sliding rod 28 that slides through the top of the flotation tank 1, and the bottom end of the sliding rod 28 is fixed with an extrusion plate 27 located in the flotation tank 1. And the extrusion plate 27 is located above the air outlet tube 9, and the outer wall of the sliding rod 28 is provided with a second spring 29 that is fixedly connected to the top of the extrusion plate 27, and the top of the second spring 29 is fixedly connected to the top inner wall of the flotation tank 1. A liquid guide hose 31 is fixed to the bottom of the medicine box 30, and a medicine storage cavity is provided in the mobile platform 2. The bottom end of the liquid guide hose 31 is connected to the medicine storage cavity, and is used to inject flocculants into the medicine storage cavity. Two injection tubes 32 are fixed to the bottom of the mobile platform 2, and the injection tubes 32 are connected to the medicine storage cavity. The bottom ends of the two injection tubes 32 extend into the flotation tank 1, and are used to inject flocculants into the flotation tank 1. A blocking block 33 for blocking the liquid inlet of the liquid guiding hose 31 is slidably connected to the bottom inner wall of the medicine box 30, and a sliding plate 34 is fixed to one side of the blocking block 33. One end of the sliding plate 34 is sealed and slidably extended to one side of the medicine box 30, and an inclined hole 35 located outside the medicine box 30 is provided in the sliding plate 34. A pin rod 36 is slidably fitted in the inclined hole 35, and the pin rod 36 is fixed in the sliding rod 28.

[0026] Specifically, when the extrusion plate 27 drives the sliding rod 28 to move upward synchronously, the cooperation of the pin rod 36 and the inclined hole 35 drives the sliding plate 34 and the blocking block 33 to move outward, thereby releasing the blocking of the liquid guiding hose 31. At this time, the flocculant in the medicine box 30 flows into the medicine storage cavity in the mobile platform 2 through the liquid guiding hose 31, and is discharged through the medicine injection pipe 32. With the movement of the mobile platform 2, the contact range between the flocculant and the sewage can be increased, so that the flocculant can fully react with the sewage, improve the flocculation efficiency, and improve the sewage treatment efficiency in the later stage.

[0027] Reference Figure 1 and Figure 5 The top of the air flotation box 1 is rotatably connected to a reciprocating screw 4 through the base, one end of the reciprocating screw 4 is threaded through the moving platform 2, and a driving motor 5 is also fixed to the top of the air flotation box 1, and the output shaft of the driving motor 5 is fixedly connected to one end of the reciprocating screw 4 through a coupling. A guide rod 3 is also fixed to the top of the air flotation box 1 through the base, and one end of the guide rod 3 slides through the moving platform 2 to ensure the stability of the moving platform 2 during movement.

[0028] Reference Figure 2-Figure 4 In the flotation tank 1, a stirring rod 6 is provided, one end of which is sealed and rotatably extended to one side of the flotation tank 1, and is connected to the reciprocating screw rod 4 through a sprocket and a chain transmission. In this way, when the driving motor 5 drives the reciprocating screw rod 4 to rotate, it can not only drive the moving platform 2 to move on the top of the flotation tank 1, but also drive the stirring rod 6 to rotate in the flotation tank 1 through the sprocket and the chain, so as to stir the sewage and accelerate the mixing of the sewage, the flocculant and the aerosolized water.

[0029] Reference Figure 3 , Figure 4 and Figure 7 A collecting box 11 is also provided on one side of the flotation tank 1. A concave filter screen 12 is fixed in the collecting box 11 for filtering the scum. A traction rod 40 is slidably penetrated in the concave filter screen 12. A pressing plate 39 is fixed on the top of the traction rod 40 for squeezing the scum on the concave filter screen 12. The bottom end of the traction rod 40 is sealed and slidably penetrates the collecting box 11 and is fixed with a moving frame 41. The other end of the stirring rod 6 is sealed and rotated to extend to the other end of the flotation tank 1 and is fixed with a rotating disk 37. A pin 38 is fixed on the side of the rotating disk 37 that deviates from the center of the circle. The pin 38 extends into the moving frame 41 and slidably cooperates with the moving frame 41.

[0030] Specifically, when the rotating disk 37 rotates, the pin 38 cooperates with the moving frame 41 to drive the pressing plate 39 to move up and down in the concave filter 12, squeezing the scum to separate the scum from the water. The separated water flows into the drain pipe 44 through the return pipe 42 at the bottom of the collection box 11 for discharge.

[0031] Reference Figure 2 , Figure 4 , Figure 8 and Fig. 9 In addition, rectangular holes 21 are provided on both sides of the flotation tank 1 that are away from each other, and a trapezoidal sliding bar 22 is slidably connected in the rectangular hole 21. A plurality of first springs 24 are fixed on the side of the trapezoidal sliding bar 22 that is away from each other, and a plurality of stoppers 23 are fixed on both sides of the flotation tank 1. One end of the first spring 24 away from the trapezoidal sliding bar 22 is fixedly connected to the stopper 23, and is used to make way for the trapezoidal sliding bar 22. A gas outlet 9 is also provided on the top of the flotation tank 1, and load-bearing rods 25 are fixed on both sides of the bottom of the gas outlet 9. The load-bearing rods 25 are used to keep the nozzle 10 in an inclined state. The load-bearing rods 25 cooperate with the inclined surface of the trapezoidal sliding bar 22, so that the trapezoidal sliding bar 22 can be squeezed into the rectangular hole 21 when the moving platform 2 drives the gas outlet 9 to move.

[0032] Specifically, when the punching bag 9 is reset, the load-bearing rod 25 cooperates with the right-angled surface of the trapezoidal sliding bar 22 near the end of the collecting box 11 to drive the punching bag 9 to rotate counterclockwise. A push rod 26 is also fixed to one side of the punching bag 9, and the push rod 26 pushes the squeezing plate 27 to move upward under the action of the rotation of the punching bag 9. In this way, when the mobile platform 2 drives the punching bag 9 to move, the squeezing plate 27 can be driven to move upward, thereby discharging the flocculant in the medicine box 30 into the flotation tank 1.

[0033] Reference Figure 2 , Figure 3 , Figure 4 and Fig.10An air dissolving tank 45 is stably placed at one end of the air flotation tank 1 away from the slag discharge port 13 through an L-shaped plate. One end of the air dissolving tank 45 is fixedly connected to a water inlet pipe 46, and one end of the water inlet pipe 46 extends to the interior of the air flotation tank 1, so as to introduce the prepared aerosolized water into the air flotation tank 1. Two connecting pipes are provided on the outer wall of the air dissolving tank 45, and the two connecting pipes are respectively connected to a water pump and an air compressor and used in conjunction with each other to inject clean water and air into the air dissolving tank 45 to prepare the aerosolized water.

[0034] Reference Figure 4 and Figure 5 The nozzle 10 is installed in the flotation tank 1, and its inclination angle is carefully set between 20° and 30°. Such a design enables the nozzle 10 to effectively gather the slag on the liquid surface to the top of the slag discharge plate 15, providing convenience for subsequent slag discharge operations.

[0035] In summary, the high-efficiency dissolved air flotation sewage treatment equipment drives the reciprocating screw 4 to rotate through the driving motor 5, which not only drives the mobile platform 2 to remove the scum, but also drives the stirring rod 6 to rotate through the sprocket and chain, thereby accelerating the mixing of sewage, flocculant and aerosol water. At the same time, the rotation of the stirring rod 6 also drives the pressing plate 39 to move up and down in the concave filter 12 through the cooperation of the turntable 37 and the pin 38, thereby completing the separation of scum and water. In addition, during the movement process, the mobile platform 2 also drives the extrusion plate 27 to move up through the cooperation of the air outlet 9 and the push rod 26, thereby realizing the automatic delivery of the flocculant.

[0036] In summary, the high-efficiency dissolved air flotation sewage treatment equipment realizes the effective removal of scum, the uniform injection of flocculants and the effective separation of water in the scum through the ingenious design of the slag discharge structure, the injection structure and the separation structure, thereby improving the sewage treatment efficiency and treatment effect.

[0037] Example 2 refer to Fig.11 and Fig.12 , based on the improvement of Example 1: a plurality of mounting plates 18 are fixed to the bottom of the slag discharge plate 15, and a plurality of hemispherical protrusions 19 are fixed to the side of these mounting plates 18 close to the collecting box 11. At the same time, a plurality of knocking rods 20 are fixed to one side of the concave filter screen 12, and one end of these knocking rods 20 is sealed and slidably extended into the flotation tank 1. The end of the knocking rod 20 is designed to be spherical, which matches the hemispherical protrusion 19.

[0038] Specifically, such a structure enables the mounting plate 18 to move synchronously when the slag discharge plate 15 moves upward. When the hemispherical protrusion 19 on the mounting plate 18 contacts the spherical end of the knocking rod 20, a knocking effect is produced, causing the concave filter screen 12 to vibrate. This vibration can shake the scum on the concave filter screen 12 to the middle, providing convenience for the pressing plate 39 to squeeze out the water in the scum later, thereby improving the treatment efficiency and effect of the entire sewage treatment equipment.

[0039] A method for using a laboratory efficient dissolved air flotation sewage treatment device comprises the following steps: S1. Inject the sewage to be treated into the flotation tank 1 through the sewage inlet pipe 43. The sewage level is higher than the slag discharge plate 15 and lower than the gas outlet tube 9. Inject a sufficient amount of flocculant into the reagent box 30, and then inject the flocculant into the flotation tank 1. Stir the sewage in the flotation tank 1 through the stirring rod 6 to flocculate the sewage. Inject clean water and air into the air dissolving tank 45 through the water pump and the air compressor respectively. Clean water and air form aerosol water in the air dissolving tank 45. Open the valve on the water inlet pipe 46 to inject aerosol water into the flotation tank 1. At this time, the flocculated wastewater in the sewage floats on the liquid surface under the action of the aerosol water. S2, then the driving motor 5 drives the reciprocating screw 4 to rotate, and the reciprocating screw 4 drives the air outlet tube 9 to move through the moving platform 2, and the air pump 14 injects air into the air outlet tube 9, and the air is blown obliquely downward through the nozzle 10, which can blow the scum on the liquid surface to the top of the slag discharge plate 15 and gather it. The nozzle 10 is always tilted under the gravity of the load-bearing rod 25. When the air outlet tube 9 moves to the position of the trapezoidal sliding bar 22, the load-bearing rod 25 cooperates with the inclined surface of the trapezoidal sliding bar 22 to squeeze the trapezoidal sliding bar 22 outward. The first spring 24 is in a compressed state, and then the punching bag 9 continues to move until the punching bag 9 touches the first connecting rod 16 and pushes the first connecting rod 16 to rotate counterclockwise. At this time, the load-bearing rod 25 is out of contact with the trapezoidal sliding bar 22, and the trapezoidal sliding bar 22 is reset under the action of the first spring 24, and the first connecting rod 16 pulls the slag discharge plate 15 upward through the second connecting rod 17, and then the slag discharge plate 15 can pick up the slag gathered on the top and discharge it into the collection box 11 through the slag discharge port 13, completing the slag removal operation; S3. When the slag discharge plate 15 moves upward, the slag discharge plate 15 drives the mounting plate 18 to move synchronously. The mounting plate 18 can continuously vibrate the concave filter screen 12 through the cooperation of the hemispherical protrusion 19 and the knocking rod 20, and can shake the scum on the concave filter screen 12 to the middle, so that the pressing plate 39 can squeeze out the water in the scum later; S4. In addition, when the reciprocating screw 4 rotates, the reciprocating screw 4 drives the stirring rod 6 to rotate through the sprocket and the chain, which is not only used to stir the sewage and accelerate the mixing of the sewage, flocculant and aerosol water, but also can drive the turntable 37 and the pin 38 to rotate. The cooperation of the pin 38 and the moving frame 41 can drive the traction rod 40 and the pressing plate 39 to move up and down reciprocatingly. The pressing plate 39 can squeeze the scum in the middle of the concave filter 12 to complete the separation of the scum and water, and the separated water flows into the sewage pipe 44 through the return pipe 42 for discharge; S5. When the slag discharge plate 15 moves up to complete the discharge of the slag, the liquid surface is relatively clean. At this time, the flocculant is discharged into the flotation tank 1, so that the flocculant can fully react with the sewage. Specifically, the reciprocating screw 4 drives the air outlet 9 to move to the left and reset, and the load-bearing rod 25 touches one end of the trapezoidal sliding bar 22, driving the air outlet 9 to rotate counterclockwise, and the air outlet 9 drives the push rod 26 to rotate. As the air outlet 9 moves, the push rod 26 touches the extrusion plate 27 and pushes the extrusion plate 27 upward, and the extrusion plate 27 drives the sliding rod 28 to move synchronously, and the cooperation of the pin rod 36 and the inclined hole 35 drives the sliding plate 34 and the blocking block 33 to move outward, thereby releasing the blockage of the liquid guiding hose 31. The flocculant in the medicine box 30 flows into the medicine storage cavity in the mobile platform 2 through the liquid guiding hose 31, and is discharged into the flotation tank 1 through the medicine injection pipe 32. As the mobile platform 2 moves, the contact range of the flocculant and the sewage can be increased, so that the flocculant can fully react with the sewage, thereby improving the flocculation efficiency and the sewage treatment efficiency in the later stage.

[0040] However, as is well known to those skilled in the art, the working principles and wiring methods of the drive motor 5 and the air pump 14 are commonplace, and are conventional means or common knowledge, and will not be elaborated here. Those skilled in the art may make any optional selections according to their needs or convenience.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A laboratory efficient dissolved air flotation sewage treatment equipment, characterized in that: It comprises an air flotation tank (1), one side of the air flotation tank (1) is provided with a sewage inlet pipe (43) for injecting sewage, one end of the air flotation tank (1) is provided with a sewage discharge pipe (44) for discharging treated sewage, one end of the air flotation tank (1) is provided with a slag discharge port (13) for discharging floating slag, and the slag discharge port (13) is located above the sewage discharge pipe (44), and one end of the air flotation tank (1) is fixed with a collection box (11) located below the slag discharge port (13) for collecting floating slag; It also comprises a stirring rod (6) rotating in the flotation box (1), wherein the flotation box (1) is provided with an air outlet (9), and a plurality of nozzles (10) are provided on one side of the air outlet (9), and the nozzles (10) discharge air obliquely downward to blow and gather scum on the liquid surface in the direction of the scum discharge port (13); The reagent box (30) is fixedly arranged on the top of the flotation box (1), and a moving platform (2) is slidably provided on the top of the flotation box (1) for driving the gas outlet cylinder (9) to move and discharge the flocculant; A slag removal structure is arranged at the bottom of the movable platform (2) and is used to drive the gas outlet cylinder (9) to move and remove slag on the liquid surface; A drug injection structure, arranged in the air flotation tank (1), for injecting flocculants after the scum is removed; The separation structure is arranged in the collection box (11) and is used to separate water from the collected scum.

2. A laboratory efficient dissolved air flotation sewage treatment equipment according to claim 1, characterized in that: The slag discharge structure comprises two connecting arms (7) fixed at the bottom of the moving platform (2), the bottom ends of the two connecting arms (7) both extend into the air flotation box (1) and are both fixed with mounting rings (8), the air outlet tube (9) is rotatably sleeved in the two mounting rings (8), an air pump (14) is fixed at one end of the air flotation box (1) away from the slag discharge port (13), the air outlet end of the air pump (14) is connected to the air outlet tube (9) through a hose, and is used to discharge air to the liquid surface to gather the slag to one side, and the air in the air flotation box (1) is connected to the slag discharge port (13). A slag discharge plate (15) is slidably connected to cooperate with the slag discharge port (13) and is used to discharge the accumulated slag through the slag discharge port (13). The top inner wall of the flotation box (1) is rotatably connected to two first connecting rods (16), and the first connecting rods (16) cooperate with the air outlet tube (9). The air outlet tube (9) is used to push the first connecting rod (16) to rotate. The bottom ends of the two first connecting rods (16) are rotatably connected to the second connecting rod (17), and the bottom end of the second connecting rod (17) is rotatably connected to the top of the slag discharge plate (15).

3. A laboratory efficient dissolved air flotation sewage treatment equipment according to claim 2, characterized in that: The drug injection structure comprises a sliding rod (28) which slides through the top of the air flotation box (1); the bottom end of the sliding rod (28) is fixed with an extrusion plate (27) located in the air flotation box (1); the outer wall of the sliding rod (28) is provided with a second spring (29) which is fixedly connected to the top of the extrusion plate (27); and the top end of the second spring (29) is fixedly connected to the top inner wall of the air flotation box (1); the bottom of the medicine box (30) is fixed with a liquid guide hose (31); a medicine storage cavity is provided in the mobile platform (2); the bottom end of the liquid guide hose (31) is connected to the medicine storage cavity and is used to inject flocculant into the medicine storage cavity; and two drug injection tubes (32) are fixed to the bottom of the mobile platform (2); the drug injection tubes (32) are connected to the medicine storage cavity. The bottom ends of the two injection tubes (32) extend into the flotation box (1) for injecting flocculants into the flotation box (1). The bottom inner wall of the medicine box (30) is slidably connected to a blocking block (33) for blocking the liquid inlet of the liquid guiding hose (31). A sliding plate (34) is fixed to one side of the blocking block (33). One end of the sliding plate (34) extends to one side of the medicine box (30) in a sealing manner. An inclined hole (35) located outside the medicine box (30) is provided in the sliding plate (34). A pin rod (36) is slidably fitted in the inclined hole (35), and the pin rod (36) is fixed in the sliding rod (28). The cooperation between the pin rod (36) and the inclined hole (35) drives the sliding plate (34) to move outward.

4. A laboratory efficient dissolved air flotation sewage treatment equipment according to claim 3, characterized in that: The separation structure comprises a concave filter screen (12) fixed in the collection box (11) for filtering scum, a traction rod (40) slidingly passing through the concave filter screen (12), a pressing plate (39) fixed at the top end of the traction rod (40) for squeezing scum on the concave filter screen (12), a bottom end of the traction rod (40) sealingly sliding through the collection box (11) and fixed with a moving frame (41), one end of the stirring rod (6) sealingly rotating and extending to one end of the air flotation tank (1) A rotating disk (37) is fixed thereto. A pin (38) is fixed to a side of the rotating disk (37) that deviates from the center of the circle. The pin (38) extends into the moving frame (41) and is slidably engaged with the moving frame (41). The rotating disk (37) drives the pressing plate (39) to reciprocate up and down through the engagement of the pin (38) and the moving frame (41). A return pipe (42) is fixed to the bottom of the collecting box (11). The bottom end of the return pipe (42) is connected to a sewage discharge pipe (44) for discharging the separated sewage.

5. A laboratory efficient dissolved air flotation sewage treatment equipment according to claim 4, characterized in that: The top of the air flotation box (1) is rotatably connected to a reciprocating screw (4) via a base, one end of the reciprocating screw (4) is threadedly inserted through the moving platform (2), a driving motor (5) is fixed to the top of the air flotation box (1), and the output shaft of the driving motor (5) is fixedly connected to one end of the reciprocating screw (4) via a coupling, a guide rod (3) is fixed to the top of the air flotation box (1) via a base, and one end of the guide rod (3) slides through the moving platform (2), and one end of the stirring rod (6) away from the turntable (37) is sealed and rotatably extended to one side of the air flotation box (1) and is connected to the reciprocating screw (4) via a sprocket and a chain transmission.

6. A laboratory efficient dissolved air flotation sewage treatment equipment according to claim 5, characterized in that: The flotation box (1) is provided with rectangular holes (21) on two sides away from each other, and a trapezoidal sliding bar (22) is slidably connected in each of the two rectangular holes (21). A plurality of first springs (24) are fixed to the sides of the two trapezoidal sliding bars (22) away from each other. A plurality of stoppers (23) are fixed to both sides of the flotation box (1), and one end of the first spring (24) away from the trapezoidal sliding bar (22) is fixedly connected to the stopper (23) for making way for the trapezoidal sliding bar (22). The bottom of the air outlet bag (9) is fixed with bearings on both sides. A weight rod (25), the weight rod (25) is used to keep the nozzle (10) in an inclined state, the weight rod (25) cooperates with the inclined surface of the trapezoidal sliding bar (22) to squeeze the trapezoidal sliding bar (22) into the rectangular hole (21), the weight rod (25) cooperates with the right-angle surface of the trapezoidal sliding bar (22) at one end close to the collection box (11) to drive the air outlet bag (9) to rotate counterclockwise, a push rod (26) is fixed to one side of the air outlet bag (9), and the push rod (26) cooperates with the extrusion plate (27) to drive the extrusion plate (27) to move upward.

7. A laboratory efficient dissolved air flotation sewage treatment equipment according to claim 6, characterized in that: An air dissolving tank (45) is placed on one end of the air flotation tank (1) away from the slag discharge port (13) via an L-shaped plate; a water inlet pipe (46) is fixed to one end of the air dissolving tank (45); one end of the water inlet pipe (46) extends into the air flotation tank (1); two connecting pipes are provided on the outer wall of the air dissolving tank (45); the two connecting pipes are respectively matched with a water pump and an air compressor, and are used to inject clean water and air into the air dissolving tank (45).

8. A laboratory efficient dissolved air flotation sewage treatment equipment according to claim 7, characterized in that: The nozzle (10) is inclined at an angle of 20°-30° and is used to gather the slag on the liquid surface to the top of the slag discharge plate (15).

9. A laboratory efficient dissolved air flotation sewage treatment equipment according to claim 8, characterized in that: A plurality of mounting plates (18) are fixed to the bottom of the slag discharge plate (15), a plurality of hemispherical protrusions (19) are fixed to one side of the plurality of mounting plates (18) close to the collection box (11), a plurality of knocking rods (20) are fixed to one side of the concave filter screen (12), one end of the plurality of knocking rods (20) are sealed and slidably extended into the air flotation tank (1), one end of the knocking rod (20) is spherical and cooperates with the hemispherical protrusion (19) to vibrate the concave filter screen (12) through the knocking rod (20).

10. The method for using a laboratory efficient dissolved air flotation wastewater treatment equipment according to claim 9, characterized in that: The following steps are involved: S1, injecting the sewage to be treated and the flocculant into the flotation tank (1), stirring to flocculate the sewage; at the same time, injecting clean water and air into the air dissolving tank (45) to form aerosol water, and injecting it into the flotation tank (1) to make the scum in the sewage float on the liquid surface; S2, the driving motor (5) drives the reciprocating screw rod (4) to rotate, so that the air outlet cylinder (9) moves; the air pump (14) injects air into the air outlet cylinder (9), and blows it obliquely downward through the nozzle (10), so that the scum on the liquid surface is blown to the top of the slag discharge plate (15) and gathered; when the air outlet cylinder (9) moves to a specific position, the air outlet cylinder (9) pushes the first connecting rod (16) to pull the slag discharge plate (15) upward, and the scum is picked up and discharged into the collection box (11) through the slag discharge port (13), thereby completing the scum removal; S3, when the slag discharge plate (15) moves upward, it drives the mounting plate (18) to move synchronously, causing the concave filter screen (12) to vibrate, thereby shaking off the slag on the filter screen for subsequent processing; S4, when the reciprocating screw (4) rotates, the sprocket and chain drive the stirring rod (6) to rotate, thereby accelerating the mixing of sewage, flocculant and aerosol water, and driving the pressing plate (39) to move up and down reciprocatingly, squeezing the scum in the middle of the concave filter (12), completing the separation of the scum and water, and the separated water is discharged through the return pipe (42); S5. After the slag discharge is completed, the flocculant is discharged into the flotation tank (1) so that the flocculant fully reacts with the sewage. The reciprocating screw (4) drives the air outlet cylinder (9) to reset, thereby releasing the blockage of the liquid guide hose (31). The flocculant in the medicine box (30) flows into the medicine storage cavity in the mobile platform (2) and is discharged through the medicine injection pipe (32), thereby increasing the contact range between the flocculant and the sewage.

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