Integrated magnetic coagulation device with magnetic powder recovery function

Abstract

The application relates to an integrated magnetic coagulation device with a magnetic powder recovery function, which comprises a main pool body, water inlets and outlets are arranged at two ends of the main pool body, a coagulation zone, a flocculation zone and a sedimentation zone are arranged along the direction from the water inlet to the water outlet, a magnetic mixing zone is arranged on the side of the coagulation zone, a magnetic powder recovery device is arranged on the side of the flocculation zone, and a hydraulic flushing device is arranged above the sedimentation zone; the magnetic powder recovery device comprises at least one magnetic roller, a scraper, at least one magnetic powder outlet and a sludge outlet, one end of the scraper is in contact with the outer surface of the magnetic roller and is used for scraping the magnetic powder adsorbed on the magnetic roller, the sludge not attracted to the magnetic roller is discharged through the sludge outlet, and the other end of the scraper is connected with the magnetic powder outlet, so that the scraped magnetic powder enters the magnetic powder outlet along the scraper.

Description

Technical Field

[0001] This invention belongs to the technical field of magnetic coagulation devices for wastewater treatment, specifically relating to an integrated magnetic coagulation device with magnetic powder recovery function. Background Technology

[0002] In the field of wastewater treatment, magnetic coagulation sedimentation technology involves simultaneously adding magnetic powder to the coagulation sedimentation process. This allows the magnetic powder to flocculate and combine with pollutants, enhancing the coagulation and flocculation effects. The resulting flocs are denser and more robust, capable of adsorbing more pollutants, thus achieving high-speed sedimentation. This method offers better pollutant removal than conventional flocculation sedimentation, and is particularly suitable for removing oily pollutants and total phosphorus from water. Magnetic coagulation sedimentation technology has achieved good results in pilot-scale applications in various sub-sectors, including urban wastewater treatment, reclaimed water reuse, tap water treatment, river water treatment, high-phosphorus wastewater treatment, papermaking wastewater treatment, and oilfield wastewater treatment.

[0003] However, the recovery rate of magnetic powder used in magnetic flocculation sedimentation technology is low. Traditional magnetic powder recovery devices recover magnetic powder from sludge and return it to the reaction tank at the front end of the magnetic coagulation sedimentation process for continued use. However, during equipment maintenance or long-term shutdown, all the magnetic powder in the tank needs to be discharged with the sludge. Especially in industrial wastewater treatment applications, it cannot be reused, resulting in a reduced magnetic powder reuse rate. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides an integrated magnetic coagulation device with magnetic powder recovery function. The device features a novel magnetic powder recovery unit, which improves the magnetic powder recovery rate. Additionally, it incorporates a hydraulic flushing device, which facilitates cleaning of the inclined plates during operation, avoiding the drawbacks of traditional perforated aeration devices that are prone to clogging and difficult to maintain.

[0005] The integrated magnetic coagulation device with magnetic powder recovery function includes a main tank. The main tank has an inlet and an outlet at its two ends. A coagulation zone, a flocculation zone and a sedimentation zone are set along the direction from the inlet to the outlet. A magnetic mixing zone is set on the side of the coagulation zone. A magnetic powder recovery device is set on the side of the flocculation zone. A hydraulic flushing device is set above the sedimentation zone.

[0006] The magnetic powder recovery device includes at least one magnetic drum, a scraper, at least one magnetic powder outlet and a sludge outlet. One end of the scraper contacts the outer surface of the magnetic drum and is used to scrape off the magnetic powder adsorbed on the magnetic drum. The sludge not attracted to the magnetic drum is discharged from the sludge outlet. The other end of the scraper is connected to the magnetic powder outlet, so that the scraped magnetic powder enters the magnetic powder outlet along the scraper.

[0007] Optionally, a coagulation mixer is provided in the coagulation zone, and the water inlet and the first chemical dosing port are located on the upstream side of the coagulation zone;

[0008] The coagulation zone and the magnetic mixing zone are arranged perpendicular to the water flow direction in the main tank. The magnetic mixing zone is equipped with a loading mixer. The top of the partition wall between the coagulation zone and the magnetic mixing zone is equipped with an overflow port. The water treated in the coagulation zone overflows into the magnetic mixing zone from the overflow port. Magnetic powder is added in the magnetic mixing zone for magnetic coagulation.

[0009] Optionally, the flocculation zone is equipped with a second dosing port and a flocculation mixer. The bottom of the magnetic mixing zone is connected to the flocculation zone through a pipeline, and the water and sludge treated by magnetic mixing are input into the flocculation zone.

[0010] Optionally, a sludge scraper is provided on the upstream side of the sedimentation zone, and a sludge collection device is provided below the sludge scraper. The sludge collection device is connected in sequence to a high shear machine and a magnetic powder recovery device through pipes.

[0011] Optionally, the magnetic powder recovery device includes a shell, at least one magnetic roller, a scraper, two magnetic powder outlets and a collection hopper. The upper middle part of the shell is provided with a sludge inlet and the bottom is provided with a sludge outlet. The inside of the shell is provided with a magnetic roller, a sludge collecting trough and a collection hopper from top to bottom. The sludge collecting trough is connected to the sludge outlet. The sludge collecting trough collects the sludge that falls from the magnetic roller and then discharges it from the shell through the sludge outlet.

[0012] The scraper is located on one side of the magnetic roller. One end of the scraper contacts the outer surface of the magnetic roller, and the other end is connected to the top of the first magnetic powder outlet. The first magnetic powder outlet and the second magnetic powder outlet are arranged side by side. The top of the second magnetic powder outlet is provided with a swing baffle to switch the discharge path of the magnetic powder.

[0013] The first magnetic powder outlet is connected to a collection hopper via a transfer channel for temporary collection of magnetic powder.

[0014] Further optionally, the mud outlet, the first magnetic powder outlet and the second magnetic powder outlet are arranged side by side, the mud outlet and the first magnetic powder outlet are separated by a first partition, and the first magnetic powder outlet and the second magnetic powder outlet are separated by a second partition.

[0015] The second magnetic powder outlet is connected to the magnetic mixing zone via a pipeline, and is used to discharge the recycled magnetic powder discharged through the second magnetic powder outlet into the magnetic mixing zone for continued use.

[0016] Further optionally, the bottom end of the scraper is rotatably connected to the top of the first partition, so that the scraper swings with its bottom end as the fulcrum; the bottom end of the swing baffle is rotatably connected to the top of the second partition, so that the swing baffle swings with its bottom end as the fulcrum.

[0017] Further optionally, the transmission channel is located above the collection hopper, and a heating device is provided on the outside of the transmission channel for heating and drying the magnetic powder in the transmission channel. The dried magnetic powder falls into the collection hopper.

[0018] The beginning of the transmission channel is connected to the bottom of the first magnetic powder outlet. The inside of the transmission channel is equipped with a spiral conveying shaft, and the end of the transmission channel is equipped with an outlet, which is used to transport the magnetic powder entering the transmission channel to the outlet, and then from the outlet into the collection hopper.

[0019] The sludge inlet of the magnetic powder recovery device is connected to the sludge collection device below the sludge scraper. The mud and water in the sludge collection device are dispersed and introduced into the outer shell. At this time, the amount of water in the mud and water is relatively large. When the magnetic roller adsorbs magnetic powder, the large amount of water can easily wash away the magnetic powder already adsorbed on the magnetic roller, causing the magnetic powder to be lost. In addition, after the action of the magnetic mixing zone, flocculation zone and sedimentation zone, the pollutants form a precipitate with a large volume or density. Even if it is dispersed by the high shear machine, the magnetic powder on the surface of the small precipitate is easily adsorbed by the magnetic roller, but the magnetic powder wrapped inside the precipitate is easily lost with the sludge, and the magnetic powder recovery efficiency is not high.

[0020] To further address the aforementioned issues, the upper part of the magnetic powder recovery device is also equipped with a primary adsorption and pulverization device. The primary adsorption and pulverization device includes a flexible mesh plate, a drainage trough, several grinding barrels, and a first guide rail. The sludge inlet of the magnetic powder recovery device is located above the primary adsorption and pulverization device. The inner walls on both sides of the outer shell are respectively equipped with the first guide rail. The flexible mesh plate is laid horizontally and wrapped around the vertical direction once. The two ends of the flexible mesh plate are slidably connected to the first guide rail on both sides, so that the flexible mesh plate can move along the first guide rail. A magnetic body is provided inside the flexible mesh plate to attract magnetic powder and flocculants containing magnetic powder in the incoming water.

[0021] The drainage trough is located inside the circle formed by the flexible mesh plate to receive sewage and non-magnetic sludge falling from the upper flexible mesh plate; the crushing barrel is located below the lower flexible mesh plate to crush the sludge adsorbed on the flexible mesh plate; the magnetic separation roller is located below the lower flexible mesh plate after the crushing barrel to receive the crushed sludge and magnetic powder.

[0022] Further optionally, the flexible mesh plate includes several crossbeams and longitudinal beams that are crisscrossed. The crossbeams are parallel to the first guide rail, and the longitudinal beams are perpendicular to the crossbeams. The longitudinal beams are hollow, and each longitudinal beam is provided with a movable magnetic body that is parallel to the longitudinal beam.

[0023] When the magnetic material is in close contact with the side wall of the longitudinal beam, the flexible mesh plate can adsorb magnetic powder and sludge containing magnetic powder. When the magnetic material leaves the side wall of the longitudinal beam, the flexible mesh plate releases the adsorbed magnetic powder and sludge containing magnetic powder, causing them to fall onto the magnetic roller.

[0024] In addition, the sedimentation zone of traditional magnetic coagulation sedimentation process is often equipped with inclined plates to increase the sedimentation efficiency of flocs. However, during operation, the inclined plates will become clogged. Traditional rinsing methods are mostly manual rinsing, which is very inconvenient. There are also perforated aeration devices installed at the bottom of the inclined plates to rinse the inclined plates, but because there are free magnetic powders in the tank, the perforations are easy to clog, making maintenance difficult and resulting in uneven air distribution and poor cleaning effect.

[0025] Optionally, the hydraulic flushing device includes a water pump, a water pipe, and a second guide rail. The water pump is located at the edge of the main tank, with the water pump inlet connected to the water outlet and the water pump outlet connected to the water pipe. The water pipe is mounted on the second guide rail and is perpendicular to the water flow direction of the main tank. Several spray holes are evenly distributed on the lower surface of the water pipe for spraying water downwards to flush the inclined plate set in the sedimentation area.

[0026] The second guide rail is set along one or both sides of the main tank. One or both ends of the water pipe are slidably connected to the second guide rail. Driven by the drive device, the water pipe moves along the second guide rail to rinse the inclined plates at different positions in the sedimentation zone. The spray angle of the spray hole is consistent with the installation angle of the inclined plate, so that the inclined plate can be thoroughly rinsed. Attached Figure Description

[0027] Figure 1 A schematic diagram of an integrated magnetic coagulation device with magnetic powder recovery function;

[0028] Figure 2 This is a schematic diagram of a magnetic powder recovery device.

[0029] Figure 3 This is a schematic diagram of the primary adsorption and pulverization device;

[0030] Figure 4 This is a schematic diagram of the flexible mesh panel structure.

[0031] Figure 5 This is a schematic diagram of the internal structure of the longitudinal beam.

[0032] In the attached diagram, 1-main tank body, 2-inlet, 3-outlet, 4-coagulation zone, 5-flocculation zone, 6-sedimentation zone, 7-magnetic powder recovery device, 8-hydraulic flushing device, 9-magnetic drum, 10-scraper, 11-first magnetic powder outlet, 12-second magnetic powder outlet, 13-sludge outlet, 14-coagulation mixer, 15-loading mixer, 16-flocculation mixer, 17-sludge scraper, 18-outer shell, 19-collection hopper, 20-sludge inlet, 21-sludge collection trough, 22-high shear machine, 23-swinging baffle. 24-Transmission channel, 25-Heating device, 26-Screw conveyor shaft, 27-Transmission outlet, 28-Third partition, 29-Flexible mesh plate, 30-Drainage trough, 31-Compactor barrel, 32-First guide rail, 33-Magnetic body, 34-Crossbeam, 35-Longitudinal beam, 36-Support plate, 37-Upper position setting, 38-Middle position setting, 39-Limiting plate, 40-Upper flexible mesh plate, 41-Lower flexible mesh plate, 42-Slider, 43-Water pipe, 44-Second guide rail, 45-Water pump, 46-Magnetic mixing zone. Detailed Implementation

[0033] The integrated magnetic coagulation device with magnetic powder recovery function provided in this embodiment, such as Figures 1-5 As shown, it includes a main tank 1, with an inlet 2 and an outlet 3 at each end of the main tank 1. A coagulation zone 4, a flocculation zone 5 and a sedimentation zone 6 are respectively arranged along the direction from the inlet 2 to the outlet 3. A magnetic mixing zone 46 is provided on the side of the coagulation zone 4, a magnetic powder recovery device 7 is provided on the side of the flocculation zone 5, and a hydraulic flushing device 8 is provided above the sedimentation zone 6.

[0034] The magnetic powder recovery device 7 includes at least one magnetic roller 9, a scraper 10, at least one magnetic powder outlet and a sludge outlet 13. One end of the scraper 10 contacts the outer surface of the magnetic roller 9 and is used to scrape off the magnetic powder adsorbed on the magnetic roller 9. The sludge not attracted on the magnetic roller 9 is discharged from the sludge outlet 13. The other end of the scraper 10 is connected to the magnetic powder outlet, so that the scraped magnetic powder enters the magnetic powder outlet along the scraper 10.

[0035] Optionally, the main pool body 1 is rectangular and is a concrete structure or an integral steel frame structure.

[0036] Optionally, a coagulation mixer 14 is provided in the coagulation zone 4, and the water inlet 2 and the first chemical dosing port are located on the upstream side of the coagulation zone 4.

[0037] The arrangement of the coagulation zone 4 and the magnetic mixing zone 46 is perpendicular to the water flow direction in the main tank 1. The magnetic mixing zone 46 is equipped with a loading mixer 15. The top of the partition wall between the coagulation zone 4 and the magnetic mixing zone 46 is provided with an overflow port. The water treated by the coagulation zone 4 overflows into the magnetic mixing zone 46 from the overflow port. Magnetic powder is added in the magnetic mixing zone 46 for magnetic coagulation.

[0038] Optionally, the flocculation zone 5 is provided with a second dosing port and a flocculation mixer 16. The bottom of the magnetic mixing zone 46 is connected to the flocculation zone 5 through a pipeline, and the water and sludge treated by magnetic coagulation are input into the flocculation zone 5.

[0039] Optionally, a sludge scraper 17 is provided on the upstream side of the sedimentation zone 6. The sludge scraper 17 is preferably a chain-plate type sludge scraper. A sludge collection device is provided below the sludge scraper 17. The sludge collection device is connected to the high-shear machine 22 and the magnetic powder recovery device 7 in sequence through pipes. The sludge is fed into the high-shear machine 22, dispersed, and then fed into the magnetic powder recovery device 7.

[0040] Optionally, the magnetic powder recovery device 7 includes a housing 18, at least one magnetic roller 9, a scraper 10, two magnetic powder outlets and a collection hopper 19. The upper middle part of the housing 18 is provided with a mud inlet 20 and the bottom is provided with a mud outlet 13. The inside of the housing 18 is provided with a magnetic roller 9, a mud collecting trough 21 and a collection hopper 19 from top to bottom. The mud collecting trough 21 is connected to the mud outlet 13. The mud collecting trough 21 collects the sludge that falls from the magnetic roller 9 and then discharges it from the housing 18 through the mud outlet 13.

[0041] The scraper 10 is located on one side of the magnetic roller 9. One end of the scraper 10 contacts the outer surface of the magnetic roller 9, and the other end is connected to the top of the first magnetic powder outlet 11. The first magnetic powder outlet 11 and the second magnetic powder outlet 12 are arranged side by side. The top of the second magnetic powder outlet 12 is provided with a swing baffle 23 for switching the discharge path of the magnetic powder.

[0042] The first magnetic powder outlet 11 is connected to the collection hopper 19 via the transmission channel 24 for temporary collection of magnetic powder.

[0043] Further optionally, the magnetic roller 9 includes a permanent magnet, a metal cylinder and a rotating shaft. The rotating shaft is located at the center of the metal cylinder and is parallel to the metal cylinder. The rotating shaft passes through the side wall of the outer casing 18 and is connected to an external roller drive device. The rotating shaft is connected to the inner wall of the fixed metal cylinder through several connecting rods, thereby driving the metal cylinder to rotate.

[0044] The permanent magnet is fixed inside the metal cylinder and remains stationary. The permanent magnet corresponds to the surface of the metal cylinder at 3 / 4-4 / 5, making the corresponding surface of the metal cylinder magnetic, while the other surfaces are not magnetic. The scraper 10 corresponds to the non-magnetic surface, and the mud inlet 20 is close to the magnetic surface of the metal cylinder.

[0045] The mud and water entering through the mud inlet 20 falls onto the surface of the magnetic metal cylinder, attracting magnetic powder. As the metal cylinder rotates, when the surface of the magnetic metal cylinder leaves the effective range of the permanent magnet, the magnetism disappears, and the magnetic powder adsorbed on its outer surface is scraped off by the scraper 10. The unadsorbed mud and water falls into the mud-collecting trough 21 below. The magnetic roller 9 continues to rotate, and after passing the scraper 10, the surface of the metal cylinder re-enters the effective range of the permanent magnet, regaining its magnetism and attracting magnetic powder in the mud-collecting trough 21. When it continues to rotate below the mud inlet 20, it collects the falling mud and water again, attracting magnetic powder, and this process repeats. Alternatively, the mud and water entering through the mud inlet 20 falls into the interior of the outer shell, causing the internal water level to rise to the mud-collecting trough 21. The mud and water then enter the mud-collecting trough 21, where the magnetic roller 9 rolls and attracts magnetic powder.

[0046] Optionally, the sludge collecting trough 21 is a semi-circular shape with an arc, surrounding the magnetic roller 9 but not in contact with it, so as not to affect the rotation of the magnetic roller 9; the side of the sludge collecting trough 21 near the sludge outlet 13 is connected to the sludge outlet 13 to discharge the sludge accumulated in the sludge collecting trough 21, and the outlet of the sludge outlet 13 can be connected to the coagulation zone 4, the flocculation zone 5, or the sedimentation zone 6 through a pipe.

[0047] Optionally, the mud outlet 13, the first magnetic powder outlet 11, and the second magnetic powder outlet 12 are arranged side by side, with the mud outlet 13 and the first magnetic powder outlet 11 separated by a first partition, and the first magnetic powder outlet 11 and the second magnetic powder outlet 12 separated by a second partition, which is a neat arrangement that saves space.

[0048] The second magnetic powder outlet 12 is connected to the magnetic mixing zone 46 via a pipe, and is used to discharge the recycled magnetic powder discharged through the second magnetic powder outlet 12 into the magnetic mixing zone 46 for continued use.

[0049] Further optionally, the bottom end of the scraper 10 is rotatably connected to the top of the first partition, so that the scraper 10 swings with its bottom end as the fulcrum; the bottom end of the swing baffle 23 is rotatably connected to the top of the second partition, and the swing baffle 23 swings with its bottom end as the fulcrum.

[0050] The rotation direction of the magnetic roller 9 is coordinated with the position of the scraper 10. For example, if the scraper 10 is located on the left side of the magnetic separator, the magnetic roller 9 will rotate counterclockwise. The magnetic roller 9 is connected to the roller drive device on the side of the housing 18. When the top of the scraper 10 swings to the outer surface of the magnetic roller 9, it scrapes off the magnetic powder adsorbed by the magnetic roller 9, and the magnetic powder slides along the scraper 10. When the top of the swing baffle 23 swings towards the second magnetic powder outlet 12, the swing baffle 23 covers the top of the second magnetic powder outlet 12, and the top of the first magnetic powder outlet 11 is open. The scraped-off magnetic powder enters the first magnetic powder outlet 11 along the scraper 10. When the top of the swing baffle 23 swings towards the first magnetic powder outlet 11, the swing baffle 23 covers the top of the first magnetic powder outlet 11, and the top of the second magnetic powder outlet 12 is open. The scraped-off magnetic powder enters the second magnetic powder outlet 12 along the scraper 10 and the swing baffle 23 in sequence.

[0051] Further optionally, the transmission channel 24 is located above the collection hopper 19, and a heating device 25 is provided on the outside of the transmission channel 24 for heating and drying the magnetic powder in the transmission channel 24. The dried magnetic powder falls into the collection hopper 19.

[0052] The beginning of the transmission channel 24 is connected to the bottom of the first magnetic powder outlet 11. The inside of the transmission channel 24 is provided with a spiral conveying shaft 26, and the end of the transmission channel 24 is provided with a transmission outlet 27, which is used to transport the magnetic powder entering the transmission channel 24 to the transmission outlet 27, and then from the transmission outlet 27 into the collection hopper 19. The spiral conveying shaft 26 is connected to a transmission device outside the outer casing 18.

[0053] Alternatively, the bottom outlet of the collection hopper 19 is connected to a magnetic powder collection device outside the main tank 1 via a pipe, for temporarily storing magnetic powder when the main tank 1 is under major repair or shut down for a long period of time.

[0054] Optionally, a third partition 28 is provided between the mud-collecting trough 21 and the heating device 25 to isolate the water environment from the heating device 25 and the collection hopper 19.

[0055] The magnetic powder recovery device 7 of the present invention is equipped with two magnetic powder outlets according to different uses of magnetic powder, and the outlets are switched by a swing baffle 23. When the main tank 1 is running normally, the magnetic powder returns to the magnetic mixing zone 46 through the second magnetic powder outlet 12. During the maintenance or long-term shutdown of the main tank 1, the magnetic powder is dried and recovered for later use through the first magnetic powder outlet 11, the transmission channel 24, and the collection hopper 19, which greatly improves the recycling rate of magnetic powder.

[0056] Optionally, the upper part of the magnetic powder recovery device 7 is further provided with a primary adsorption and crushing device, which includes a flexible mesh plate 29, a drainage trough 30, several crushing barrels 31 and a first guide rail 32. The mud inlet 20 of the magnetic powder recovery device 7 is located above the primary adsorption and crushing device. The inner walls on both sides of the outer shell 18 are respectively provided with the first guide rail 32. The flexible mesh plate 29 is laid horizontally and wrapped around the vertical direction. The two ends of the flexible mesh plate 29 are respectively slidably connected to the first guide rail 32 on both sides, so that the flexible mesh plate 29 can move along the first guide rail 32. The flexible mesh plate 29 is provided with a magnetic body 33 for attracting magnetic powder and flocculents containing magnetic powder in the incoming water.

[0057] The drainage trough 30 is located inside the circle formed by the flexible mesh plate 29 and is used to receive sewage and non-magnetic sludge falling from the upper flexible mesh plate 40; the crushing drum 31 is located below the lower flexible mesh plate 41 and is used to crush and pulverize the sludge adsorbed on the flexible mesh plate 29; the magnetic separation drum is correspondingly located below the lower flexible mesh plate 41 after the crushing drum 31 and is used to receive the crushed sludge and magnetic powder.

[0058] Further optionally, the flexible mesh plate 29 includes a plurality of crossbeams 34 and longitudinal beams 35, the crossbeams 34 being parallel to the first guide rail 32, the longitudinal beams 35 being perpendicular to the crossbeams 34, and the longitudinal beams 35 being hollow, each longitudinal beam 35 having a movable magnetic body 33 inside, the magnetic body 33 being parallel to the longitudinal beam 35.

[0059] When the magnetic body 33 is in close contact with the side wall of the longitudinal beam 35, the flexible mesh plate 29 can adsorb magnetic powder and sludge containing magnetic powder. When the magnetic body 33 leaves the side wall of the longitudinal beam 35, the flexible mesh plate 29 releases the adsorbed magnetic powder and sludge containing magnetic powder, causing them to fall onto the magnetic roller 9.

[0060] Alternatively, the crossbeam 34 may be solid to improve the overall strength of the flexible mesh plate 29 and prevent it from being crushed by the crushing barrel 31; the flexible mesh plate 29 may be made of elastic rubber material and may be bent and compressed to restore its original shape.

[0061] Further optionally, the two ends of the longitudinal beam 35 are closed and each is provided with a rigid connector to facilitate a stable connection to the slider 42 on the first guide rail 32;

[0062] Support plates 36 are provided on the inner sides of both ends of the longitudinal beam 35. Each of the two support plates 36 has two position stops, upper and middle, on the side facing each other. The two ends of the magnetic body 33 are connected to the corresponding position stops of the two support plates 36, so that the magnetic body 33 always remains horizontal. By switching the position stops, the distance between the magnetic body 33 and the inner wall of the longitudinal beam 35 is changed.

[0063] In a specific implementation, each longitudinal beam 35 connects to several transverse beams 34. The transverse beams 34 are solid and connected to the outside of the longitudinal beams. The interior of the longitudinal beams 35 is hollow, allowing the magnetic body 33 inside the longitudinal beams 35 to pass through them. The magnetic body 33 is a slender magnetic rod that passes through the interior of the longitudinal beams 35. Both ends of the magnetic body 33 are connected to the corresponding positions of the two support plates 36. Specifically, both ends of the magnetic body 33 are fixedly connected to the upper part of the two support plates 36. When the position is set to 37, the side of the magnetic body 33 is in close contact with the upper inner wall of the longitudinal beam 35, attracting magnetic powder and sludge containing magnetic powder entering from the sludge inlet 20. When the position is switched to the middle position 38, the side of the magnetic body 33 leaves the inner wall of the longitudinal beam 35, i.e., it is suspended inside the longitudinal beam 35, neither in close contact with the upper nor lower inner wall. This state causes the flexible mesh plate 29 to lose its magnetic attraction, and the magnetic powder and sludge containing magnetic powder on the flexible mesh plate 29 fall off. Since the interior of the longitudinal beam 35 is a closed space without water, the position setting can be achieved by an existing switch-changing device that can realize the above functions.

[0064] Further optionally, the flexible mesh plate 29 is formed into an elongated oval shape in the vertical direction, similar to the shape of a conveyor belt, and outwardly protruding arc-shaped limiting plates 39 are provided on both sides of the arc-shaped position, so that when the flexible mesh plate 29 moves to the limiting plate 39, it forms an arc-shaped turn.

[0065] The upper and lower horizontal straight sections of the flexible mesh panel 29 are the upper flexible mesh panel 40 and the lower flexible mesh panel 41, respectively, and the crossbeam 34 is parallel to the moving direction of the upper flexible mesh panel 40.

[0066] Alternatively, the shape of the first guide rail 32 is the same as the shape formed by the flexible mesh plate 29, which is also an elongated oval.

[0067] Each first guide rail 32 has several sliders 42 on its inner side. Two sliders 42 at corresponding positions of two first guide rails 32 are respectively connected to the two ends of the same longitudinal beam 35, which are used to drive the flexible mesh plate 29 to move along the elongated first guide rail 32.

[0068] The driving device of each first guide rail 32 is located at the corresponding position on the outside of the housing 18, passes through the side wall of the housing 18, connects to and controls several sliders 42, thereby driving the flexible mesh plate 29 to move along the elongated oval.

[0069] Optionally, the drainage trough 30 is disposed between the upper flexible mesh plate 40 and the lower flexible mesh plate 41 to receive sewage and non-magnetic sludge falling from the upper flexible mesh plate 40; the length of the drainage trough 30 is not less than the length of the upper flexible mesh plate 40, the drainage trough 30 extends to the side wall of the outer shell 18 in the direction of the longitudinal beam 35, and has a hole in the side wall so that the material in the drainage trough 30 returns to the magnetic mixing zone 46 through the hole.

[0070] Optionally, the crushing barrel 31 is located upstream of the rotation direction of the lower flexible mesh plate 41, and several crushing barrels 31 are arranged side by side along the rotation direction of the lower flexible mesh plate 41 and are located below the lower flexible mesh plate 41. The upper surface of the crushing barrel 31 is in contact with the lower surface of the lower flexible mesh plate 41.

[0071] The lower edge of the limiting plate 39 near the crushing barrel 31 extends horizontally to the position of the last crushing barrel 31, and works with the crushing barrel 31 to crush the sludge on the flexible mesh plate 29, keeping the lower flexible mesh plate 41 flat.

[0072] The sludge inlet 20 is connected to a water distribution pipe, which is positioned above the upper flexible mesh plate 40. This ensures that the sludge and water input through the sludge inlet 20 are evenly distributed and fall onto the upper flexible mesh plate 40. A conventional water distribution pipe is sufficient. The magnetic body 33 within the longitudinal beam 35 of the upper flexible mesh plate 40, which is below the water distribution pipe, switches to the upper position 37. The magnetic body 33 is tightly attached to the upper inner wall of the longitudinal beam 35, and the upper surface of the upper flexible mesh plate 40 exerts a magnetic attraction. Simultaneously, the flexible mesh plate 29 moves clockwise along the first guide rail 32. Sludge and wastewater without magnetic powder are filtered through the upper flexible mesh plate 40 and fall into the sludge discharge trough. When the flexible mesh plate 29 moves to the right-side limiting plate 39, it bends into an arc shape. After passing through the arc section, the upper surface of the upper flexible mesh plate 40 becomes the lower surface of the lower flexible mesh plate 41, and the lower surface directly contacts the mill. The pressing barrel 31 and the horizontal extension of the right-side limiting plate 39 cooperate to crush the sludge on the flexible mesh plate 29. After the lower flexible mesh plate 41 passes through the pressing barrel 31, it moves above the magnetic roller 9. The magnetic body 33 in the longitudinal beam 35 switches to the middle position 38, which allows it to detach from the lower surface of the lower flexible mesh plate 41. The lower surface loses its magnetic attraction, and the crushed sludge falls naturally onto the magnetic roller 9, where it is re-attracted by magnetic powder. Multiple magnetic rollers 9 can be arranged side by side along the length of the longitudinal beam 35. A scraper 10 is relatively long and can contact multiple magnetic rollers 9.

[0073] The magnetic powder recovery device 7 provided by the present invention has a three-stage magnetic attraction process. First, the sludge containing magnetic powder is initially attracted by the magnetic attraction and filtration of the flexible mesh plate 29 for a first magnetic sludge separation. Then, it is crushed so that the magnetic powder inside the sludge can be fully exposed. The magnetic sludge that has lost its magnetism falls from the flexible mesh frame onto the magnetic roller 9 for a second magnetic sludge separation. The magnetic powder scraped off by the scraper 10 has a high purity, which improves the magnetic powder recovery effect. The crushed sludge that has been separated from the magnetic powder can also fall into the sludge receiving trough 21 through the gaps of the crushing barrel 31 for a third magnetic sludge separation.

[0074] Optionally, the hydraulic flushing device 8 includes a water pump 45, a water pipe 43, and a second guide rail 44. The water pump 45 is located at the edge of the main tank 1. The inlet of the water pump 45 is connected to the outlet 3, and the outlet of the water pump is connected to the water pipe 43. The water pipe 43 is mounted on the second guide rail 44 and is perpendicular to the water flow direction of the main tank 1. Several spray holes are evenly distributed on the lower surface of the water pipe 43 for spraying water downwards to flush the several inclined plates set in the sedimentation area 6.

[0075] The second guide rail 44 is set along one or both sides of the main tank 1. One or both ends of the water pipe 43 are slidably connected to the second guide rail 44. Under the drive of the drive device, the water pipe 43 moves along the second guide rail 44 to rinse the inclined plates at different positions in the sedimentation zone 6. The spray angle of the spray hole is consistent with the installation angle of the inclined plate, so that the inclined plate can be thoroughly rinsed.

Claims

1. An integrated magnetic coagulation device with magnetic powder recovery function, characterized in that, An integrated magnetic coagulation device with magnetic powder recovery function includes a main tank. The main tank has an inlet and an outlet at its two ends. A coagulation zone, a flocculation zone and a sedimentation zone are set along the direction from the inlet to the outlet. A magnetic mixing zone is set on the side of the coagulation zone. A magnetic powder recovery device is set on the side of the flocculation zone. A hydraulic flushing device is set above the sedimentation zone. The magnetic powder recovery device includes at least one magnetic drum, a scraper, two magnetic powder outlets and a sludge outlet. One end of the scraper contacts the outer surface of the magnetic drum and is used to scrape off the magnetic powder adsorbed on the magnetic drum. The sludge not attracted to the magnetic drum is discharged from the sludge outlet. The other end of the scraper is connected to the magnetic powder outlet, so that the scraped magnetic powder enters the magnetic powder outlet along the scraper. The magnetic powder recovery device includes a shell and a collection hopper. The upper middle part of the shell is provided with a mud inlet, and the bottom is provided with a mud outlet. The interior of the outer shell is equipped with a magnetic roller, a mud-collecting trough, and a collection hopper from top to bottom. The mud-collecting trough is connected to the mud outlet. The mud-collecting trough collects the sludge that falls from the magnetic roller and then discharges it from the outer shell through the mud outlet. The scraper is located on one side of the magnetic roller, and the other end of the scraper is connected to the top of the first magnetic powder outlet. The first magnetic powder outlet and the second magnetic powder outlet are arranged side by side. The top of the second magnetic powder outlet is provided with a swing baffle to switch the discharge path of the magnetic powder. The first magnetic powder outlet is connected to the collection hopper through a transmission channel for temporary collection of magnetic powder. The second magnetic powder outlet is connected to the magnetic mixing zone via a pipeline, which is used to discharge the recycled magnetic powder discharged through the second magnetic powder outlet into the magnetic mixing zone for continued use. The transmission channel is located above the collection hopper, and a heating device is provided on the outside of the transmission channel to heat and dry the magnetic powder inside the transmission channel. The dried magnetic powder falls into the collection hopper. The beginning of the transmission channel is connected to the bottom of the first magnetic powder outlet. The inside of the transmission channel is equipped with a spiral conveying shaft, and the end of the transmission channel is equipped with an outlet, which is used to transport the magnetic powder entering the transmission channel to the outlet, and then from the outlet into the collection hopper.

2. The integrated magnetic coagulation device according to claim 1, characterized in that, The coagulation zone is equipped with a coagulation mixer, and the water inlet and the first chemical dosing port are located on the upstream side of the coagulation zone. The coagulation zone and the magnetic mixing zone are arranged perpendicular to the water flow direction in the main tank. The magnetic mixing zone is equipped with a loading mixer. The top of the partition wall between the coagulation zone and the magnetic mixing zone is equipped with an overflow port. The water treated in the coagulation zone overflows into the magnetic mixing zone from the overflow port. Magnetic powder is added in the magnetic mixing zone for magnetic coagulation.

3. The integrated magnetic coagulation device according to claim 1, characterized in that, The flocculation zone is equipped with a second dosing port and a flocculation mixer. The bottom of the magnetic mixing zone is connected to the flocculation zone through a pipeline, and the water and sludge treated by magnetic mixing are input into the flocculation zone. A sludge scraper is installed upstream of the sedimentation zone, and a sludge collection device is installed below the sludge scraper. The sludge collection device is connected in sequence to a high shear machine and a magnetic powder recovery device through pipes.

4. The integrated magnetic coagulation device according to claim 1, characterized in that, The mud outlet, the first magnetic powder outlet, and the second magnetic powder outlet are arranged side by side, with the mud outlet and the first magnetic powder outlet separated by a first partition, and the first magnetic powder outlet and the second magnetic powder outlet separated by a second partition.

5. The integrated magnetic coagulation device according to claim 4, characterized in that, The bottom end of the scraper is rotatably connected to the top of the first partition, so that the scraper swings with its bottom end as the fulcrum; the bottom end of the swing baffle is rotatably connected to the top of the second partition, and the swing baffle swings with its bottom end as the fulcrum.

6. The integrated magnetic coagulation device according to claim 5, characterized in that, The upper part of the magnetic powder recovery device is also equipped with a primary adsorption and crushing device, which includes a flexible mesh plate, a drainage trough, several crushing barrels and a first guide rail. The sludge inlet is located above the primary adsorption and crushing device. The inner walls on both sides of the outer shell are respectively equipped with the first guide rail. The flexible mesh plate is laid horizontally and wrapped around the vertical direction. The two ends of the flexible mesh plate are slidably connected to the first guide rail on both sides, so that the flexible mesh plate moves along the first guide rail. The flexible mesh plate is equipped with a magnetic body to attract magnetic powder and flocculents containing magnetic powder in the incoming water. The drainage trough is located inside the circle formed by the flexible mesh plate to receive sewage and non-magnetic sludge falling from the upper flexible mesh plate; the crushing barrel is located below the lower flexible mesh plate to crush the sludge adsorbed on the flexible mesh plate; the magnetic roller is correspondingly located below the lower flexible mesh plate after the crushing barrel to receive the crushed sludge and magnetic powder.

7. The integrated magnetic coagulation device according to claim 6, characterized in that, The flexible mesh panel includes several horizontal beams and vertical beams that are crisscrossed. The horizontal beams are parallel to the first guide rail, and the vertical beams are perpendicular to the horizontal beams. The vertical beams are hollow, and each vertical beam contains a movable magnetic body that is parallel to the vertical beam. When the magnetic material is in close contact with the side wall of the longitudinal beam, the flexible mesh plate can adsorb magnetic powder and sludge containing magnetic powder. When the magnetic material leaves the side wall of the longitudinal beam, the flexible mesh plate releases the adsorbed magnetic powder and sludge containing magnetic powder, causing them to fall onto the magnetic roller.

8. The integrated magnetic coagulation device according to claim 1, characterized in that, The hydraulic flushing device includes a water pump, a water pipe, and a second guide rail. The water pump is located at the edge of the main tank. The water pump inlet is connected to the water outlet, and the water pump outlet is connected to the water pipe. The water pipe is mounted on the second guide rail and is perpendicular to the water flow direction of the main tank. Several spray holes are evenly distributed on the lower surface of the water pipe for spraying water downwards to flush the inclined plate set in the sedimentation area. The second guide rail is set along one or both sides of the main tank. One or both ends of the water pipe are slidably connected to the second guide rail. Driven by the drive device, the water pipe moves along the second guide rail to rinse the inclined plates at different positions in the sedimentation zone. The spray angle of the spray hole is consistent with the installation angle of the inclined plate, which can thoroughly rinse the inclined plate.

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