A device for purifying seawater by air floatation method

Abstract

This invention relates to the field of seawater purification, specifically a seawater purification pretreatment device using air flotation. The device includes a tank with an inlet tank on one side and an outlet tank on the other side. An air flotation purification component and an electrolytic purification component are disposed between the outlet tank and the inlet tank. The air flotation purification component includes an aeration pipe located inside the tank. The electrolytic purification component includes a truss mounted on the tank, with a rotating plate rotatably connected below the truss. Multiple electrode rods are disposed below the rotating plate, with the lower ends of the electrode rods positioned above the aeration pipes. This seawater purification pretreatment device uses a combination of air flotation and seawater electrolysis to purify mariculture wastewater. When the electrode rods are energized, the strong oxidizing substances generated during electrolysis weaken the hydrophilicity and enhance the hydrophobicity of pollutants. This, combined with high-density air bubbles, further elevates a larger amount of pollutants to the surface, improving the pretreatment effect of mariculture wastewater purification.

Description

Technical Field

[0001] This invention relates to the field of seawater purification, specifically a seawater purification pretreatment device using the air flotation method. Background Technology

[0002] With the increasing market demand for seafood, the scale of marine aquaculture in my country has expanded rapidly, and the amount of marine aquaculture wastewater discharged has increased year by year. This may lead to eutrophication of receiving water bodies and a reduction in biodiversity, affecting the balance of the ecological environment.

[0003] Therefore, it is necessary to purify the aquaculture wastewater to meet the discharge standards before it is discharged into the seawater or recycled. Currently, the most common method for treating marine aquaculture wastewater is air flotation. Its working principle is to use highly dispersed microbubbles as carriers to adhere to the pollutants in the marine aquaculture wastewater, so that the buoyancy is greater than the gravity and the upward resistance, thereby causing the pollutants to float to the surface and form foam. Then the foam is scraped off to achieve solid-liquid or liquid-liquid separation. Moreover, because air flotation technology is relatively mature, the equipment is relatively simple, and the operation is convenient, it can be flexibly installed in purification tanks of different sizes and can be adapted to the purification of seawater of different volumes.

[0004] However, the air flotation method also has its drawbacks. The necessary conditions for the air flotation process are: a large number of fine air bubbles should be distributed in the wastewater to be treated, so that the pollutants to be treated are in a suspended state, and the surface of the suspended particles should be hydrophobic, so that they can easily adhere to the air bubbles and float. The surface of the suspended particles should be hydrophobic in order to successfully adhere to the air bubbles and float. Some pollutants in the effluent of marine aquaculture are not hydrophobic and fail to float and be discharged smoothly, so the purification efficiency needs to be improved.

[0005] Therefore, a seawater purification pretreatment device using air flotation is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the air flotation method seawater purification pretreatment device of the present invention includes a tank body, an inlet tank is provided on one side of the tank body, an outlet tank is provided on the other side of the tank body, and an air flotation purification component and an electrolytic purification component are provided between the outlet tank and the inlet tank.

[0008] The air flotation purification component includes an aeration pipe installed inside the tank body, which is connected to an air storage tank on the outer wall of the tank body.

[0009] The electrolytic purification assembly includes a truss mounted on the tank body, a rotating plate rotatably connected below the truss, and multiple electrode rods arranged below the rotating plate, with the lower ends of the electrode rods located above the aeration pipe.

[0010] Preferably, a hollow tube is fixed to the middle position of the lower surface of the rotating plate, a top tube is provided on the outer ring of the hollow tube, the lower end of the top tube is fixed to the bottom surface of the pool body, and a circular support plate is provided on the upper end of the top tube, with the hollow tube passing through the middle position of the support plate.

[0011] Preferably, the outer ring of the tray is provided with a toothed ring, and a plurality of electrode rods are arranged in a circumferential array on the rotating plate. Each electrode rod is provided with a driven gear on its outer ring, and the driven gear meshes with the toothed ring.

[0012] The aeration pipe extends upward from the bottom of the tank body into the tank body and passes through the top pipe;

[0013] The lower end of the hollow tube is connected to the aeration tube, and the upper end of the hollow tube extends upward to the top of the rotating plate and is connected to multiple branch pipes arranged in a circular array. The ends of the branch pipes have hollow rings with multiple air outlets in the inner circle of the rings.

[0014] Each electrode rod is hollow inside, with multiple micropores on its surface and multiple air inlets on the outer ring of its upper end. A ring is fitted over the upper end of the electrode rod, and the air inlets and outlets are connected.

[0015] Preferably, each electrode rod is provided with multiple stirring blades, and a ball is rotatably connected to the lower end of each electrode rod;

[0016] The bottom surface of the pool body has an annular guide groove, and each ball is rolled and connected in the guide groove.

[0017] Preferably, each of the electrode rods includes an inner tube and an outer tube;

[0018] The outer tube has a strip-shaped sliding hole on its outer ring, which is set along the length of the outer tube. The inner tube is axially slidably connected to the outer tube. The inner tube is equipped with a stirring blade, which extends through the sliding hole to the outside of the outer tube. Multiple micro-holes are opened on the surface of the inner tube. A spring is provided at the upper end of the inner tube, and the end of the spring is fixed to the lower end face of the driven gear. The upper end of the inner tube is connected to the ring body through a flexible tube, and the lower end of the inner tube extends downward through the lower end of the outer tube.

[0019] The guide groove is provided with a protrusion, which is located near the water inlet groove. The protrusion is used to rotate the ball at the lower end of the upper inner tube.

[0020] Preferably, the bottom of the water inlet tank is provided with a horizontal plate, the end of which extends horizontally toward the air flotation purification component, and a channel for filling filter material is reserved between the horizontal plate and the bottom of the tank. The end of the horizontal plate is provided with a partition with a U-shaped cross-section.

[0021] The partition is vertically installed inside the tank. Multiple windows are opened on the plate of the partition near the air flotation purification component. Multiple exhaust pipes are installed on the plate of the partition opposite to the air flotation purification component. The exhaust pipes are connected to the air storage tank through pipes.

[0022] Preferably, multiple push rods are arranged in a circumferential array at the edge of the upper surface of the rotating plate, and the upper end of the push rods is rotatably connected to a ball bearing;

[0023] Multiple blocking plates are installed inside the partition, and the multiple blocking plates are fixed together. A lifting rod is fixed to the top blocking plate. The upper end of the lifting rod extends upward through the upper surface of the partition. A lifting plate is fixed to the outer ring of the upper end of the lifting rod. The lifting plate extends upward toward the rotating plate.

[0024] A pressure plate is fixed to the upper end of the lifting rod, and a return spring is fixed to both ends of the pressure plate. The end of the return spring extends downward and is fixed to the upper surface of the partition plate.

[0025] Preferably, each of the reset springs has an inner ring with a guide rod, the lower end of which is fixed to the upper surface of the partition plate, and the outer ring of the guide rod slides through the pressure plate.

[0026] Preferably, the water inlets of the window are arranged to gradually increase in size from bottom to top.

[0027] Preferably, a heating component is installed in the space between the partition and the water inlet tank, and the heating component is used to heat the gas inside the exhaust pipe.

[0028] The advantages of this invention are:

[0029] 1. In this invention, the seawater purification pretreatment device uses a combination of air flotation and seawater electrolysis to purify the effluent from marine aquaculture. When the electrode rod is energized, the strong oxidizing substances generated during the electrolysis process can reduce the hydrophilicity and increase the hydrophobicity of pollutants. This, combined with high-density air bubbles, can further float more pollutants to the surface, thereby improving the pretreatment effect of the effluent from marine aquaculture.

[0030] 2. In this invention, micropores that can generate bubbles are provided on the electrode rod. The bubbles generated on the aeration pipe work together with the bubbles generated on the electrode rod to pre-treat the effluent from seawater aquaculture. The bubbles can cover the interior of the tank in all directions, improving the adhesion effect of pollutants in the flowing seawater aquaculture effluent and further improving the purification effect. Attached Figure Description

[0031] Figure 1 This is a first-view perspective perspective view of the seawater purification and pretreatment device of the present invention;

[0032] Figure 2 This is a second-view perspective perspective view of the seawater purification pretreatment device in this invention;

[0033] Figure 3 This is a top view of the seawater purification pretreatment device of the present invention;

[0034] Figure 4This is a side view of the seawater purification pretreatment device in this invention;

[0035] Figure 5 This is a cross-sectional view of the pool body in this invention;

[0036] Figure 6 This is a top view of the pool body in this invention;

[0037] Figure 7 This is a perspective view of the blocking plate in this invention;

[0038] Figure 8 This is a perspective view of the interaction between the electrode rod and the rotating plate in this invention;

[0039] Figure 9 This is a perspective view of the interaction between the transfer plate and the gear set in this invention;

[0040] Figure 10 This is a side view of the multiple electrode rods in this invention.

[0041] Figure 11 This is an exploded view of the transfer plate and the pallet in this invention;

[0042] Figure 12 This is a perspective view of the fit between the electrode rod and the ring body in this invention;

[0043] Figure 13 This is a perspective view of the electrode rod in this invention;

[0044] Figure 14 This is a perspective view of the outer tube in this invention;

[0045] Figure 15 This is a perspective view of the inner tube in this invention.

[0046] In the diagram: 1. Pool body; 2. Inlet tank; 3. Outlet tank; 4. Aeration pipe; 5. Air storage tank; 6. Truss; 7. Rotating plate; 8. Electrode rod; 9. No. 1 isolation plate; 10. Inlet; 11. Inlet pipe; 12. No. 2 isolation plate; 13. Outlet; 14. Outlet pipe; 15. Chain; 16. Scraper; 17. Gear set; 18. Hollow tube; 19. Top pipe; 20. Guide plate; 21. Gear ring; 22. Driven gear; 23. Branch pipe; 24. Ring body; 25. Micropores 26. Air inlet; 27. Vertical pipe; 28. Agitator blade; 29. ​​Sphere; 30. Guide groove; 31. Inner pipe; 32. Outer pipe; 33. Sliding hole; 34. Spring; 35. Hose; 36. Protrusion; 37. Horizontal plate; 38. Channel; 39. Partition; 40. Window; 41. Exhaust pipe; 42. Top rod; 43. Ball bearing; 44. Blocking plate; 45. Lifting rod; 46. Lifting plate; 47. Pressure plate; 48. Return spring; 49. Guide rod; 50. Heating assembly. Detailed Implementation

[0047] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0048] Reference Figure 1 - Figure 10 A seawater purification pretreatment device using air flotation includes a tank 1, with an inlet tank 2 on one side and an outlet tank 3 on the other side. An air flotation purification component and an electrolytic purification component are disposed between the outlet tank 3 and the inlet tank 2. The air flotation purification component includes an aeration pipe 4 disposed inside the tank 1, connected to an air storage tank 5 on the outer wall of the tank 1. The electrolytic purification component includes a truss 6 mounted on the tank 1, with a rotating plate 7 rotatably connected below the truss 6. Multiple electrode rods 8 are disposed below the rotating plate 7, with the lower ends of the electrode rods 8 positioned above the aeration pipe 4. In this embodiment, a... A first isolation plate 9 is provided on the side. The bottom of the first isolation plate 9 and the bottom of the pool body 1 are reserved with a strip-shaped water inlet 10. The first isolation plate 9 and one side of the pool body 1 form a water inlet trough 2. One side of the water inlet trough 2 is connected to a water inlet pipe 11. A second isolation plate 12 is provided on the other side of the pool body 1. The second isolation plate 12 is L-shaped. The bottom of the vertical part of the second isolation plate 12 and the bottom of the pool body 1 are reserved with a strip-shaped water outlet 13. A foam scraping component is provided above the horizontal part of the second isolation plate 12. The vertical part of the second isolation plate 12 and the other side of the pool body 1 form a water outlet trough 3. One side of the water outlet trough 3 is connected to a water outlet pipe 14.

[0049] The foam scraping assembly includes a chain 15 driven by a motor, the chain 15 is mounted above the pool body 1, and multiple scrapers 16 are provided on the chain 15;

[0050] A drive assembly for driving the rotating plate 7 to rotate is provided on the truss 6. The drive assembly includes a motor. The torque output by the motor is transmitted to the rotating plate 7 through the gear set 17, driving the rotating plate 7 to rotate. The rotating plate 7 will then drive multiple electrode rods 8 to rotate inside the pool body 1.

[0051] The seawater purification pretreatment device in this embodiment purifies the effluent from marine aquaculture using a combination of air flotation and seawater electrolysis. The specific purification process is as follows:

[0052] An external water pump continuously pumps seawater aquaculture wastewater into the inlet tank 2 through the inlet pipe 11. The wastewater then flows in through the inlet 10 at the bottom of the tank 1, submerging the air flotation purification component and the electrolysis purification component. An external air pump continuously injects gas into the air storage tank 5. High-pressure gas is discharged from the air holes on the aeration pipe 4, generating high-density bubbles that adhere to and float pollutants in the seawater aquaculture wastewater to the surface. Simultaneously, the electrode rod 8 is energized, and the strong oxidizing substances generated during electrolysis oxidize and decompose some large organic molecules into smaller organic molecules. These smaller organic molecules then undergo chemical... The structure and properties may change, thus affecting their hydrophilicity and hydrophobicity. For example, some organic pollutants containing hydrophilic functional groups may lose some functional groups or generate new hydrophobic functional groups after oxidation, thereby weakening their hydrophilicity and enhancing their hydrophobicity. This, combined with high-density bubbles, can further float more pollutants to the surface. Then, under the rotation of the scraper 16, the bubbles flow along the horizontal plane of the horizontal part of the second isolation plate 12 and are finally discharged from the guide plate 21 set on the other side of the pool body 1. The purified seawater flows into the outlet tank 3 through the outlet 13 at the bottom of the pool body 1 and is discharged through the outlet pipe 14.

[0053] Furthermore, when the electrode rod 8 is energized, dissolved oxygen, carbon dioxide and other gases in the seawater can be separated during the electrolysis process, increasing the dissolved oxygen content and reducing the carbon dioxide content, thereby improving the water quality of the seawater. In addition, it can also destroy the cell walls of algae, causing them to lose their ability to grow, thereby achieving the purpose of algae removal, further improving the pretreatment and purification effect of marine aquaculture tailwater, and reducing the pressure on subsequent further purification of seawater.

[0054] The drive component can drive the rotating plate 7 to rotate, and the rotating plate 7 can drive all the electrode rods 8 to rotate. The electrode rods 8 agitate the seawater aquaculture tailwater in the tank 1, disperse the bubbles to every part of the tank 1, so that the bubbles can fully contact the seawater aquaculture tailwater, improve the adhesion effect of pollutants and bubbles in the seawater aquaculture tailwater, and improve the pretreatment effect of seawater aquaculture tailwater.

[0055] Reference Figure 1 - Figure 11 A hollow tube 18 is fixedly connected to the middle position of the lower surface of the rotating plate 7. A top tube 19 is provided on the outer ring of the hollow tube 18. The lower end of the top tube 19 is fixedly connected to the inner bottom surface of the pool body 1. A circular support plate 20 is provided on the upper end of the top tube 19. The hollow tube 18 passes through the middle position of the support plate 20.

[0056] Since the electrode rods 8 and the rotating plate 7 are mounted below the truss 6 and are suspended inside the pool 1, their stability needs to be ensured. At the same time, the rotating plate 7 and the electrode rods 8 will also rotate. The electrode rods 8 push the flowing seawater aquaculture tailwater to rotate. For this purpose, a top pipe 19 and a support plate 20 are set up. The hollow pipe 18 is rotatably connected inside the top pipe 19. The rotating plate 7 is attached to the upper surface of the support plate 20 and rotates. The top pipe 19 and the support plate 20 are used to support the rotating plate 7 and multiple electrode rods 8, so that they can operate stably during rotation and can stably push the flowing seawater aquaculture tailwater to rotate.

[0057] Reference Figure 1 - Figure 14 The outer ring of the support plate 20 is provided with a toothed ring, and a plurality of electrode rods 8 are arranged in a circumferential array on the rotating plate 7. Each electrode rod 8 is provided with a driven gear 22 on its outer ring, and the driven gear 22 meshes with the toothed ring.

[0058] The aeration pipe 4 extends upward from the bottom outside the pool body 1 into the pool body 1 and passes through the top pipe 19;

[0059] The lower end of the hollow tube 18 is connected to the aeration tube 4, and the upper end of the hollow tube 18 extends upward to the top of the rotating plate 7 and is connected to a plurality of branch tubes 23 arranged in a circular array. The end of the branch tube 23 has a hollow ring 24, and a plurality of air outlets are opened in the inner circle of the ring 24.

[0060] Each of the electrode rods 8 is hollow inside, and multiple microholes 25 are opened on the surface of the electrode rod 8. Multiple air inlets 26 are opened on the upper outer ring of the electrode rod 8. The ring body 24 is sleeved on the upper end of the electrode rod 8, and the air inlets 26 are connected to the air outlets.

[0061] The aeration pipe 4 extends from the bottom of the tank body 1 into the tank body 1. The main pipe of the aeration pipe 4 is still laid along the bottom of the tank body 1. A vertical pipe 27 is led out from the aeration pipe 4 and passes through the top pipe 19. Gas is injected from the vertical pipe 27 into the top pipe 19 and the hollow pipe 18. Then, the gas flows into the hollow ring 24 along multiple branch pipes 23. The gas flows and flows into the air inlet 26 on the outer ring of the upper end of the electrode rod 8 along the air outlet. Finally, the gas is discharged along the micropores 25 on the electrode rod 8. At this time, not only does the aeration pipe 4 produce high-density bubbles, but the micropores 25 on the electrode rod 8 also produce a large number of bubbles.

[0062] The bubbles generated on the aeration pipe 4, together with the bubbles generated on the electrode rod 8, pre-treat the effluent from marine aquaculture. The bubbles can cover the interior of the tank 1 in all directions, improving the adhesion of pollutants in the flowing marine aquaculture effluent and further enhancing the purification effect.

[0063] At the same time, the rotating plate 7 drives multiple electrode rods 8 to revolve around the axis of the rotating plate 7. The driven gear 22 on the electrode rod 8 meshes with the gear ring, and the electrode rod 8 will also rotate. During the rotation of the electrode rod 8, the multiple micropores 25 on the electrode rod 8 will face different directions, and the generated bubbles will flow to more directions, which also improves the adhesion effect of the bubbles to pollutants.

[0064] Reference Figure 1 - Figure 15 Each of the electrode rods 8 is provided with multiple stirring blades 28, and a ball 29 is rotatably connected to the lower end of each electrode rod 8;

[0065] The bottom surface of the pool body 1 is provided with an annular guide groove 30, and each ball 29 is rolled and connected in the guide groove 30.

[0066] Each electrode rod 8 is rotatably connected to the rotating plate 7. The rotating plate 7 can constrain the upper end of the electrode rod 8 to swing. A ball 29 is set at the bottom of the electrode rod 8. The ball 29 rolls in the guide groove 30 to constrain the lower end of the electrode rod 8 to swing, so that the electrode rod 8 can rotate smoothly. The constraint effect is more obvious for the electrode rod 8 with a larger length.

[0067] Meanwhile, stirring blades 28 are set on the outer ring of the electrode rod 8. When the electrode rod 8 revolves and rotates, the stirring blades 28 stir the effluent of seawater aquaculture, so that some of the dirt settled in the corners of the tank body 1 can also be stirred up and floated up with the air bubbles and discharged. This is also one of the specific means to improve the purification and pretreatment effect of seawater aquaculture effluent.

[0068] Reference Figure 1 - Figure 15 Each of the electrode rods 8 includes an inner tube 31 and an outer tube 32;

[0069] The outer tube 32 has a strip-shaped sliding hole 33 on its outer ring. The sliding hole 33 is arranged along the length of the outer tube 32. The inner tube 31 is axially slidably connected to the inner tube 32. The inner tube 31 is provided with a stirring blade 28, and the stirring blade 28 passes through the sliding hole 33 to the outside of the outer tube 32. Multiple micro holes 25 are opened on the surface of the inner tube 31. A spring 34 is provided at the upper end of the inner tube 31. The end of the spring 34 is fixed to the lower end face of the driven gear 22. The upper end of the inner tube 31 is connected to the ring body 24 through the hose 35. The lower end of the inner tube 31 passes through the lower end of the outer tube 32.

[0070] The guide groove 30 is provided with a protrusion 36, which is located near the water inlet groove 2. The protrusion 36 is used to rotatably connect the ball 29 to the lower end of the inner tube 31.

[0071] A protrusion 36 is provided in the guide groove 30, and the guide groove 30 is smoothly provided on both sides of the protrusion 36. When the ball 29 rolls in the guide groove 30, it touches the protrusion 36 and the ball 29. At the same time, the ball 29 pushes against the inner tube 31, and the inner tube 31 drives the stirring blade 28 to move upward. After the ball 29 passes the protrusion 36, the inner tube 31, under the elastic force of the spring 34 connected to it, quickly drives the stirring blade 28 to move downward. The stirring blade 28 moves up and down alternately, which can stir the marine aquaculture tailwater in the vertical direction, so that the surface of the marine aquaculture wastewater rises and falls at a high frequency. At the same time, the marine aquaculture tailwater will also impact the pollutants inside the tank 1, which can knock off the pollutants adhering to the bottom of the tank 1 in time, and they will adhere to the bubbles and float to the surface. The inner tube 31, which moves up and down alternately, mainly impacts and floats the pollutants settled at the bottom of the tank 1, and they will come into contact with the bubbles and then float to the surface and be scraped off.

[0072] Reference Figure 1 - Figure 7 The bottom of the water inlet tank 2 is provided with a horizontal plate 37, the end of the horizontal plate 37 extends horizontally towards the air flotation purification component, and the horizontal plate 37 and the bottom of the tank body 1 are provided with a channel 38 for filling filter material. The end of the horizontal plate 37 is provided with a partition 39 with a U-shaped cross section.

[0073] The partition 39 is vertically installed inside the pool body 1. Multiple windows 40 are opened on the plate of the partition 39 near the air flotation purification component. Multiple exhaust pipes 41 are installed on the plate of the partition 39 opposite to the air flotation purification component. The exhaust pipes 41 are connected to the air storage tank 5 through pipes.

[0074] The horizontal plate 37 is set at the water inlet 10, and a channel 38 is reserved between the horizontal plate 37 and the bottom of the tank body 1. The channel 38 is filled with materials that can filter the effluent of seawater aquaculture, such as filter screens, filter sponges and other filter materials that filter large particles. The effluent of seawater aquaculture is pre-purified by contact to prevent these large particles of pollutants from failing to be adhered to and floated by air bubbles, causing large particles of pollutants to sink to the bottom of the tank body 1. The filter material is installed in the reserved channel 38 between the horizontal plate 37 and the bottom of the tank body 1 by filling. Therefore, the filter material can be removed and cleaned or replaced periodically.

[0075] The partition 39 is set up to discharge the marine aquaculture tailwater into the partition 39 at different heights. The marine aquaculture tailwater flows into the partition 39 and flows out from the windows 40 at different heights. The windows 40 are set in a thin strip shape, and the marine aquaculture tailwater is subdivided into different layers. This allows the marine aquaculture tailwater to adhere evenly and quickly to the air flotation purification component and the electrolysis purification component when it comes into contact with them. This is also one of the specific ways to improve the adhesion effect between air bubbles and pollutants.

[0076] Meanwhile, an exhaust pipe 41 is installed inside the partition 39, which is connected to the gas storage tank 5. High-pressure gas is discharged from the micropores 25 on the exhaust pipe 41 and forms retrieval bubbles inside the partition 39. These bubbles first come into contact with the marine aquaculture tailwater, which not only adheres to the pollutants in the marine aquaculture tailwater but also propels it, giving pressure to the marine aquaculture tailwater inside the partition 39. This causes the marine aquaculture tailwater to be discharged quickly from the window 40 and flow to a more distant position within the partition 39. The bubbles are evenly distributed inside the marine aquaculture tailwater.

[0077] Reference Figure 1 - Figure 15 Multiple push rods 42 are arranged in a circular array at the edge of the upper surface of the rotating plate 7, and the upper end of the push rods 42 is rotatably connected to a ball bearing 43;

[0078] Multiple blocking plates 44 are arranged inside the partition 39, and the multiple blocking plates 44 are fixed together. A lifting rod 45 is fixed to the top blocking plate 44. The upper end of the lifting rod 45 extends upward through the upper surface of the partition 39. A lifting plate 46 is fixed to the outer ring of the upper end of the lifting rod 45. The lifting plate 46 extends upward toward the rotating plate 7.

[0079] The upper end of the lifting rod 45 is fixedly connected to a pressure plate 47, and the two ends of the pressure plate 47 are fixedly connected to a return spring 48. The end of the return spring 48 extends downward and is fixedly connected to the upper surface of the partition plate 39.

[0080] A blocking plate 44 is installed inside the partition 39 to indirectly block the window 40. In the initial state, the blocking plate 44 and the window 40 are staggered and separated, and the window 40 is in a flow state. When the rotating plate 7 drives the electrode rod 8 to revolve, the push rod 42 on the electrode rod 8 will rotate to the lower surface of the lifting plate 46. At this time, the push rod 42, in conjunction with the ball bearing 43, pushes the lifting plate 46 upward. The lifting plate 46 drives the lifting rod 45 to move upward, and at the same time, the lifting rod 45 drives multiple blocking plates 44 to move upward. The blocking plates 44 block the window 40. At this time, no seawater aquaculture tailwater is discharged from the window 40, while the micropores 25 on the exhaust pipe 41 continuously discharge gas. At this time, the contents of the partition 39 are blocked. The pressure of the marine aquaculture tailwater increases instantaneously. After the top rod 42 passes the lifting plate 46, under the action of the pressure plate 47 and the return spring 48, the blocking plate 44 moves down quickly and no longer blocks the window 40. At this time, the marine aquaculture tailwater is quickly discharged through the window 40. The marine aquaculture tailwater is subjected to the pressure of movement and impacts a more distant position, so that the new marine aquaculture tailwater can be evenly distributed in the tank 1. At the same time, the intermittent impact of the marine aquaculture tailwater through the window 40 can also disturb the marine aquaculture tailwater, making the internal disturbance of the marine aquaculture tailwater more dispersed and more intense, and increasing the opportunity for pollutants and bubbles in the marine aquaculture tailwater to come into contact.

[0081] Reference Figure 1 - Figure 7Each of the reset springs 48 has a guide rod 49 in its inner ring. The lower end of the guide rod 49 is fixed to the upper surface of the partition plate 39, and the outer ring of the guide rod 49 slides through the pressure plate 47.

[0082] The guide rod 49 is used to guide the movement of the pressure plate 47, so that when the pressure plate 47 moves up and down alternately, the sway amplitude of the pressure plate 47 is reduced, thereby ensuring the fit between the blocking plate 44 and the window 40. This allows the blocking plate 44 to effectively and temporarily seal the window 40, ensuring that the marine aquaculture tailwater is effectively pressurized within the partition 39. Consequently, when the marine aquaculture tailwater passes through the window 40, it has a certain pressure and impacts a greater distance.

[0083] Reference Figure 1 - Figure 5 The water inlets of the window 40 are arranged to gradually increase in size from bottom to top;

[0084] Multiple windows 40 are arranged vertically. Considering that the water pressure of the seawater aquaculture tailwater at the bottom window 40 is relatively high, the amount of water passing through the window 40 is relatively large. The area of ​​the water inlet of the window 40 closer to the top is larger to ensure that a sufficient amount of seawater aquaculture tailwater can pass through. In addition, the amount of water passing through each window 40 per unit time tends to be the same, ensuring that the seawater aquaculture tailwater at different heights can fully contact the air bubbles.

[0085] Reference Figure 1 - Figure 6 A heating component 50 is installed in the space between the partition 39 and the water inlet tank 2. The heating component 50 is used to heat the gas inside the exhaust pipe 41.

[0086] The heating component 50 in this embodiment is used to heat the gas inside the exhaust pipe 41. In cold weather, when the seawater temperature is low, the heated gas will heat the seawater aquaculture tailwater, increasing the thermal motion of water molecules and accelerating the migration rate of ions during electrolysis, thereby increasing the reaction rate and the metabolic activity of microorganisms in the seawater aquaculture tailwater. Microorganisms grow and reproduce faster at suitable temperatures, and their metabolic functions are enhanced, enabling them to interact more effectively with the electrodes and promote the degradation of pollutants. When microorganisms are combined with electro-oxidation, electrochemical stimulation can change the structure and function of the microbial community, improve the activity of microorganisms, and is also one of the ways to purify seawater aquaculture tailwater. Specifically, the heating component 50 can be a heating resistance wire, which is wound around the exhaust pipe 41 to heat the gas inside the exhaust pipe 41.

[0087] Working principle: The seawater purification pretreatment device set in this embodiment purifies the effluent from marine aquaculture through a combination of air flotation and seawater electrolysis. The specific purification process is as follows:

[0088] An external water pump continuously pumps seawater aquaculture wastewater into the inlet tank 2 through the inlet pipe 11. The wastewater then flows in through the inlet 10 at the bottom of the tank 1, submerging the air flotation purification component and the electrolysis purification component. An external air pump continuously injects gas into the air storage tank 5. High-pressure gas is discharged from the air holes on the aeration pipe 4, generating high-density bubbles that adhere to and float pollutants in the seawater aquaculture wastewater to the surface. Simultaneously, the electrode rod 8 is energized, and the strong oxidizing substances generated during electrolysis oxidize and decompose some large organic molecules into smaller organic molecules. These smaller organic molecules then undergo chemical... The structure and properties may change, thus affecting their hydrophilicity and hydrophobicity. For example, some organic pollutants containing hydrophilic functional groups may lose some functional groups or generate new hydrophobic functional groups after oxidation, thereby weakening their hydrophilicity and enhancing their hydrophobicity. This, combined with high-density bubbles, can further float more pollutants to the surface. Then, under the rotation of the scraper 16, the bubbles flow along the horizontal plane of the second isolation plate 12 and are finally discharged from the guide plate 21 set on the other side of the pool body 1. The purified seawater flows into the outlet 3 through the outlet 13 at the bottom of the pool body 1 and is discharged through the outlet pipe 14.

[0089] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seawater purification pretreatment device using air flotation, characterized in that: The system includes a pool body, with an inlet tank on one side of the pool body and an outlet tank on the other side of the pool body. An air flotation purification component and an electrolysis purification component are installed between the outlet tank and the inlet tank. The air flotation purification component includes an aeration pipe installed inside the tank body, which is connected to an air storage tank on the outer wall of the tank body. The electrolytic purification component includes a truss mounted on the tank body, a rotating plate rotatably connected below the truss, and multiple electrode rods arranged below the rotating plate, with the lower ends of the electrode rods located above the aeration pipe. A hollow tube is fixed to the middle position of the lower surface of the rotating plate. A top tube is provided on the outer ring of the hollow tube. The lower end of the top tube is fixed to the bottom surface of the pool body. A fixed gear is provided at the upper end of the top tube. The hollow tube passes through the middle position of the fixed gear. Multiple electrode rods are arranged in a circumferential array on the rotating plate, and each electrode rod has a driven gear on its outer ring, which meshes with a fixed gear. The aeration pipe extends upward from the bottom of the tank body into the tank body and passes through the top pipe; The lower end of the hollow tube is connected to the aeration tube, and the upper end of the hollow tube extends upward to the top of the rotating plate and is connected to multiple branch pipes arranged in a circular array. The ends of the branch pipes have hollow rings with multiple air outlets in the inner circle of the rings. Each of the electrode rods is hollow inside, with multiple micropores on the surface of the electrode rod and multiple air inlets on the outer ring of the upper end of the electrode rod. A ring is fitted over the upper end of the electrode rod, and the air inlets and outlets are connected. Each of the electrode rods is provided with multiple stirring blades, and a ball is rotatably connected to the lower end of each electrode rod; The bottom surface of the pool body is provided with an annular guide groove, and each ball is rolled and connected in the guide groove; Each of the electrode rods includes an inner tube and an outer tube; The outer tube has a strip-shaped sliding hole on its outer ring, which is set along the length of the outer tube. The inner tube is axially slidably connected to the outer tube. The inner tube is equipped with a stirring blade, which extends through the sliding hole to the outside of the outer tube. Multiple micro-holes are opened on the surface of the inner tube. A spring is provided at the upper end of the inner tube, and the end of the spring is fixed to the lower end face of the driven gear. The upper end of the inner tube is connected to the ring body through a flexible tube, and the lower end of the inner tube extends downward through the lower end of the outer tube. The guide groove is provided with a protrusion, which is located near the water inlet groove. The protrusion is used to rotate the ball at the lower end of the upper inner tube.

2. The seawater purification pretreatment device using air flotation according to claim 1, characterized in that: The bottom of the water inlet tank is provided with a horizontal plate, the end of which extends horizontally toward the air flotation purification component, and a channel for filling filter material is reserved between the horizontal plate and the bottom of the tank. The end of the horizontal plate is provided with a partition with a U-shaped cross-section. The partition is vertically installed inside the tank. Multiple windows are opened on the plate of the partition near the air flotation purification component. Multiple exhaust pipes are installed on the plate of the partition opposite to the air flotation purification component. The exhaust pipes are connected to the air storage tank through pipes.

3. The seawater purification pretreatment device using air flotation according to claim 2, characterized in that: Multiple push rods are arranged in a circular array at the upper edge of the rotating plate, and the upper end of each push rod is rotatably connected to a ball bearing. Multiple scrapers are arranged inside the partition, and the scrapers are fixed together. A lifting rod is fixed to the top scraper. The upper end of the lifting rod extends upward through the upper surface of the partition. A lifting plate is fixed to the outer ring of the upper end of the lifting rod, and the lifting plate extends upward toward the rotating plate. A pressure plate is fixed to the upper end of the lifting rod, and a return spring is fixed to both ends of the pressure plate. The end of the return spring extends downward and is fixed to the upper surface of the partition plate.

4. The seawater purification pretreatment device using air flotation according to claim 3, characterized in that: Each of the reset springs has a guide rod in its inner ring. The lower end of the guide rod is fixed to the upper surface of the partition plate, and the outer ring of the guide rod slides through the pressure plate.

5. The seawater purification pretreatment device using air flotation according to claim 2, characterized in that: The water inlets of the window are arranged to gradually increase in size from bottom to top.

6. The seawater purification pretreatment device using air flotation according to claim 4, characterized in that: A heating component is installed in the space between the partition and the water inlet tank. The heating component is used to heat the gas inside the exhaust pipe.

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