Sewage flocculation treatment equipment and treatment method

Abstract

The present invention discloses a sewage flocculation treatment device and method, which relates to the technical field of sewage treatment. The device comprises a housing, a water inlet pipe and a medicine storage tank provided at the top of the housing, the medicine storage tank being used to release medicine into the housing; a plurality of electrode plate groups, each of which is arranged in an interval within the housing, each of which includes two electrode plates with a gap provided between the two electrode plates; and an aeration pipe provided within the housing, the aeration pipe being located in the middle below the electrode plates. The present invention circulates sewage through the gaps between the electrode plates through the aeration pipe, generating flocculants between the electrode plates that combine with pollutants in the raw water to form larger flocs. PAM is added to the housing to flocculate pollutants in the sewage, causing the flocs containing magnetic powder to enter the sewage discharge pipe. The magnetic powder is attracted and fixed by a magnetic field, separating the magnetic powder from the flocs. The separated magnetic powder is recovered and pushed back into the housing through a sealing plate that moves upward, facilitating the next sewage treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to sewage flocculation treatment equipment and a treatment method. Background Art

[0002] With the rapid development of science, technology, and the economy, the amount of wastewater generated in the production processes of industries such as petrochemicals, electricity, mining, and papermaking has gradually increased, causing serious environmental pollution. To conserve precious water resources and avoid environmental pollution, wastewater must be purified. In the current field of sewage treatment, there are many different methods and types of equipment used for sewage treatment. Electroflocculation, a new heavy metal wastewater treatment process, uses metals such as aluminum and iron as anodes. Under the action of direct current, it produces Al and Fe ions. After a series of hydrolysis, polymerization, and ferrous oxidation processes, these ions develop into various hydroxyl complexes, polynuclear hydroxyl complexes, and even hydroxides, causing colloidal and suspended impurities in the wastewater to condense and precipitate, thereby separating them. Magnetic flocculation is a technology that uses magnetic powder to rapidly settle flocs during conventional flocculation processes, significantly improving the treatment effect and settling rate of the original flocculation process.

[0003] However, in existing sewage treatment, electric flocculation and magnetic flocculation are separated and carried out in different devices, which makes the sewage treatment process complicated. In addition, in the process of recovering magnetic powder in magnetic flocculation, the flocs formed by impurities and magnetic powder are usually transferred to another device for separation and recovery of the magnetic powder. The magnetic powder separation process is complicated and the magnetic powder cannot be effectively recycled, resulting in the problem of difficulty in recovering magnetic powder. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a sewage treatment equipment and treatment method that integrates electric flocculation and magnetic flocculation, is simple to operate, improves flocculation effect and sedimentation rate, and facilitates the recovery of magnetic powder.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A sewage flocculation treatment device, comprising:

[0007] The box body has a water inlet pipe and a medicine storage tank on the top, and the medicine storage tank is used to put medicine into the box body;

[0008] Multiple electrode plate groups, each electrode plate group is arranged in an interval inside the box, each electrode plate group includes two electrode plates, and a gap is provided between the two electrode plates;

[0009] The aeration pipe is arranged inside the box, the aeration pipe is located in the middle below the electrode plate, and is arranged perpendicular to the plane of each electrode plate;

[0010] A sewage pipe is provided at the bottom of the box body. A sealing plate is slidably connected to the interior of the sewage pipe. The sealing plate is provided with a lifting mechanism to drive the sealing plate to move up and down inside the sewage pipe.

[0011] and a first electromagnetic coil, which is arranged outside the sewage pipe to absorb the magnetic powder in the flocculation passing through the sewage pipe and moves upward through the sealing plate to push the magnetic powder back into the box.

[0012] Furthermore, the lifting mechanism includes a driving motor, a threaded rod and a threaded sleeve. The threaded sleeve is fixedly connected to the sealing plate and is threadedly connected to the threaded rod. The driving motor is fixedly connected to the sewage pipe, and the output shaft of the driving motor is connected to the bottom end of the threaded rod. A sewage outlet is provided at the bottom of one side of the sewage pipe, and a sealing ring is provided on the outside of the sealing plate.

[0013] Furthermore, the horizontal cross-section of the sewage pipe is rectangular, and two first electromagnetic coils are provided, and are respectively arranged on both long sides of the sewage pipe.

[0014] Furthermore, the bottom of the box is funnel-shaped, and a second electromagnetic coil is provided at the bottom of the box.

[0015] Furthermore, the aeration pipe is arranged horizontally, and multiple nozzles are arranged at intervals on the top of the aeration pipe, each nozzle facing the gap between the electrode plates. One end of the aeration pipe is connected to the air inlet pipe, and the top of the box is provided with an exhaust pipe, and a second solenoid valve is provided on the exhaust pipe.

[0016] Furthermore, an insulating plate is provided between each electrode plate group, a guide block is provided at the bottom of the insulating plate, the guide block is in a pointed cone shape, and the guide block is located at the bottom of the electrode plate, and two guide plates are provided between each electrode plate group, the two guide plates are arc-shaped and trumpet-shaped.

[0017] Furthermore, a top cover is provided on the top of the box body, each electrode plate group is fixedly connected to the bottom of the top cover, a bracket is provided on the inner wall of the box body to support each electrode plate group, and a hanging ring is provided on the top of the top cover.

[0018] Furthermore, a pipeline connection is provided between the medicine storage tank and the box body, a first solenoid valve is provided on the pipeline, and a cover is provided on the top of the medicine storage tank.

[0019] Furthermore, a water outlet pipe is provided at the bottom of one side of the box body, and a third solenoid valve is provided on the water outlet pipe. One end of the water outlet pipe extends to the interior of the box body, and the end is connected to a rotating tube. The rotating tube is arranged vertically to the water outlet pipe. A rotating mechanism is provided on the water outlet pipe. The rotating mechanism is used to drive the water outlet pipe to rotate so that the rotating tube rotates accordingly. The rotating mechanism includes a servo drive motor and two gears. The two gears are respectively arranged on the output shaft of the rotating tube and the servo drive motor, and the two gears are meshed. An observation window is provided on one side of the box body, and the observation window is located on one side of the rotating tube.

[0020] In view of the above-mentioned sewage flocculation treatment equipment, the present invention also provides an electromagnetic flocculation sewage treatment method, comprising the following steps:

[0021] S1: Inject the sewage to be treated into the box through the water inlet pipe, and inject gas into the box through the aeration pipe. The gas enters the sewage and stirs the sewage;

[0022] S2: The gas ejected from the aeration pipe drives the sewage to circulate through the gaps between the electrode plates, connecting the electrode plates in the multiple parallel electrode plates with direct current, generating an electric field between the electrode plates, and dissolving A1 on the electrode plates. 3+ or Fe 2+ Ions, and hydrolyze in sewage to produce flocculation reaction, while electrical flotation and redox reaction occur;

[0023] S3: Magnetic powder is mixed with sewage inside the box at a dosage of 100 mg / L. The first solenoid valve then controls the amount of reagent in the drug storage tank to add PAM into the box at a dosage of 0.5 mg / L. The sewage is stirred through the aeration pipe for 15 minutes, and the sedimentation time is 15 minutes.

[0024] S4: During sedimentation, the second electromagnetic coil is turned on to adsorb the flocculation containing magnetic powder and accelerate sedimentation. After sedimentation, the supernatant is discharged through the outlet pipe;

[0025] S5: After the supernatant is discharged, it descends through the sealing plate, allowing the flocculants containing magnetic powder to enter the sewage pipe. At this time, the first electromagnetic coil is turned on, and the first electromagnetic coil adsorbs and fixes the magnetic powder on the side wall of the sewage pipe, so that the magnetic powder is separated from the flocculants. The gas ejected from the aeration pipe blows the magnetic powder adsorbed and fixed on the side wall of the sewage pipe to separate the flocculants and impurities. After the magnetic powder is separated from the impurities, the magnetic powder is pushed back into the box through the sealing plate. Repeat the above steps to treat the sewage again.

[0026] The beneficial effects of the present invention are:

[0027] In the present invention, the sewage flocculation treatment equipment sprays gas toward the gaps between the electrode plates through the aeration pipe, thereby driving the sewage circulation and stirring inside the box. The sewage circulates through the gaps between the electrode plates, and an electric field is generated between the electrode plates. After the soluble anode loses electrons, metal cations are formed, which react with 0H in the solution. - Generate metal hydroxide colloidal flocculants. This new ecological hydroxide has high activity and strong adsorption capacity. It combines with colloids, suspended matter, soluble pollutants, bacteria, viruses, etc. in the raw water to form larger flocs, thereby improving the flocculation effect. In addition, each electrode plate group is connected to the top cover to form an integral module. The top cover together with each electrode plate group can be lifted as a whole module by a crane, making it easy to replace each electrode plate group.

[0028] Pressurized air flotation is applied to the sewage through the aeration pipe to generate bubbles. In conjunction with the electrolysis process, hydrogen and oxygen are respectively released at the cathode and anode, generating highly dispersed tiny bubbles. These bubbles then adhere to pollutants such as colloids and emulsions in the raw water and float to the water surface to be separated, thereby improving the sewage treatment effect.

[0029] While the aeration tube drives the sewage to circulate through the gaps between the electrode plates, the magnetic powder inside the box mixes with the sewage. PAM is added to the inside of the box and the sewage is stirred through the aeration tube. The combined effect of magnetic attraction and surface charge helps the pollutants in the sewage to flocculate. Then, the second electromagnetic coil generates a magnetic field to adsorb the flocculate containing the magnetic powder, causing the flocculate to settle at the bottom of the box faster, thereby improving sewage treatment efficiency.

[0030] After sedimentation, the sediment dividing line inside the box is observed through the observation window, and the outlet pipe is driven to rotate by the servo drive motor and gears, and the position of the inlet of the rotating pipe is adjusted so that the inlet of the rotating pipe is downward close to the dividing line, which is convenient for discharging the supernatant in the box;

[0031] After the supernatant is discharged, it descends along the inner wall of the sewage pipe through the sealing plate, so that the flocculants containing magnetic powder enter the sewage pipe. At this time, the first electromagnetic coil is turned on, and the first electromagnetic coil generates a magnetic field to adsorb and fix the magnetic powder on the side wall of the sewage pipe, while the impurities are discharged through the sewage outlet, so that the magnetic powder is separated from the flocculants. At this time, the gas ejected from the aeration pipe will be ejected through the sewage pipe, thereby blowing the magnetic powder adsorbed and fixed on the side wall of the sewage pipe. Since the magnetic powder is adsorbed and fixed, the impurities are blown out, further improving the magnetic powder separation effect. After the magnetic powder is separated, it moves upward through the sealing plate, and the separated magnetic powder is recovered and pushed back into the box to facilitate the next sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the three-dimensional structure of a sewage flocculation treatment device proposed by the present invention;

[0033] Figure 2 This is a schematic diagram of a three-dimensional cross-sectional structure of a sewage flocculation treatment device proposed by the present invention;

[0034] Figure 3 This is a schematic cross-sectional view of a sewage flocculation treatment device proposed by the present invention;

[0035] Figure 4 This is a left-side structural cross-sectional view of a sewage flocculation treatment device proposed by the present invention;

[0036] Figure 5 This is a right side structural sectional view of a sewage flocculation treatment device proposed by the present invention.

[0037] In the figure: 1 box body, 101 top cover, 102 bracket, 2 water inlet pipe, 3 medicine storage tank, 301 first solenoid valve, 302 cover, 4 exhaust pipe, 401 second solenoid valve, 5 water outlet pipe, 501 third solenoid valve, 502 rotating pipe, 6 rotating mechanism, 7 observation window, 8 sewage pipe, 801 sewage outlet, 9 first electromagnetic coil, 10 driving motor, 11 electrode plate, 12 insulating plate, 13 aeration pipe, 14 nozzle, 15 air inlet pipe, 16 second electromagnetic coil, 17 threaded rod, 18 threaded sleeve, 19 sealing plate, 20 guide block, 21 guide plate. DETAILED DESCRIPTION

[0038] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0039] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0040] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this patent.

[0041] In the description of this patent, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "set" should be understood in a broad sense. For example, they can refer to fixed connection or set, detachable connection or set, or integral connection or set. Those skilled in the art will understand the specific meanings of the above terms in this patent based on the specific circumstances.

[0042] Example 1

[0043] Reference Figure 1-5 , a sewage flocculation treatment equipment, is used in sewage treatment to improve the flocculation effect and sedimentation rate, and to facilitate the recovery of magnetic powder.

[0044] The sewage flocculation treatment equipment includes a box body 1, a plurality of electrode plate groups, an aeration pipe 13, a sewage pipe 8 and a first electromagnetic coil 9;

[0045] A water inlet pipe 2 is provided on the top of the box body 1, which is used to discharge the sewage to be treated into the box body 1. A medicine storage tank 3 is provided on the top of the box body 1, and a pipe is provided between the medicine storage tank 3 and the box body 1. A first solenoid valve 301 is provided on the pipe, and a cover 302 is provided on the top of the medicine storage tank 3. The medicine storage tank 3 is used to release medicine into the box body 1. The first solenoid valve 301 can control the amount of medicine released. The bottom of the box body 1 is funnel-shaped, and a second electromagnetic coil 16 is provided at the bottom of the box body 1. The second electromagnetic coil 16 can adsorb and fix magnetic powder, thereby accelerating the precipitation of magnetic powder flocculation.

[0046] A top cover 101 is provided on the top of the box body 1, and each electrode plate group is fixedly connected to the bottom of the top cover 101, so that each electrode plate group is an integral module. A bracket 102 is provided on the inner wall of the box body 1 to support each electrode plate group. A lifting ring is provided on the top of the top cover 101, which facilitates the crane equipment to lift the top cover 101 together with each electrode plate group as an integral module and remove it from the box body 1, thereby facilitating the replacement of each electrode plate group.

[0047] The electrode plate groups are arranged at intervals inside the box body 1, and each electrode plate group includes two electrode plates 11. There is a gap between the two electrode plates 11, and an insulating plate 12 is provided between each electrode plate group. A guide block 20 is provided at the bottom of the insulating plate 12. The guide block 20 is in a pointed cone shape and is located at the bottom of the electrode plate 11. Two guide plates 21 are provided between each electrode plate group. The two guide plates 21 are arc-shaped and trumpet-shaped. The arc-shaped guide plates 21 make the sewage flow to both sides along the arc-shaped guide plates 21 when it rises from the middle of the box body 1, which facilitates the sewage to come to the bottom of the box body 1 from the outside, thereby improving the sewage circulation and stirring effect.

[0048] The aeration pipe 13 is arranged horizontally inside the box body 1. The aeration pipe 13 is located in the middle below the electrode plate 11 and is arranged perpendicular to the plane of each electrode plate 11. A plurality of nozzles 14 are arranged at intervals on the top of the aeration pipe 13. Each nozzle 14 faces the gap between the electrode plates 11. One end of the aeration pipe 13 is connected to the air inlet pipe 15. The aeration pipe 13 can spray gas upward, thereby driving the sewage in the middle of the box body 1 upward into the gap between the electrode plates 11, and then circulates from both sides to the bottom of the box body 1, so that the sewage is circulated and stirred inside the box body 1.

[0049] The drain pipe 8 is arranged at the bottom of the box body 1, and a drain port 801 is provided at the bottom of one side of the drain pipe 8. The drain port 801 is used to discharge the precipitated flocculation. The horizontal cross-section of the drain pipe 8 is rectangular. Two first electromagnetic coils 9 are provided, and are respectively arranged on the long sides of both sides of the drain pipe 8. This allows the first electromagnetic coil 9 to absorb the magnetic powder in the flocculation passing through the drain pipe 8, so that the magnetic powder in the flocculation can be evenly adsorbed on the side wall of the drain pipe 8. At this time, the flocculated magnetic powder is a thin layer, which is convenient for separating impurities in the flocculated magnetic powder when the gas is blown, while ensuring that the magnetic powder will not be blown out.

[0050] A sealing plate 19 is slidably connected to the inside of the sewage pipe 8, and a lifting mechanism is provided on the sealing plate 19. The lifting mechanism includes a drive motor 10, a threaded rod 17 and a threaded sleeve 18. The threaded sleeve 18 is fixedly connected to the sealing plate 19 and is threadedly connected to the threaded rod 17. The drive motor 10 is fixedly connected to the sewage pipe 8, and the output shaft of the drive motor 10 is connected to the bottom end of the threaded rod 17. A sealing ring is provided on the outside of the sealing plate 19. The drive motor 10 can drive the threaded rod 17 to rotate, so that the sealing plate 19 moves up and down inside the sewage pipe 8 through the threaded sleeve 18. By moving the sealing plate 19 upward, the magnetic powder attached to the sewage pipe 8 can be pushed back into the box 1.

[0051] An exhaust pipe 4 is provided on the top of the box body 1, and a second solenoid valve 401 is provided on the exhaust pipe 4. The second solenoid valve 401 is opened during stirring to facilitate gas discharge. When it is necessary to blow and clean the magnetic powder attached to the inner wall of the drain pipe 8, the second solenoid valve 401 is closed and the gas will be discharged through the drain pipe 8, thereby blowing and cleaning the magnetic powder on the inner wall of the drain pipe 8.

[0052] A water outlet pipe 5 is provided at the bottom of one side of the box body 1, and a third solenoid valve 501 is provided on the water outlet pipe 5. One end of the water outlet pipe 5 extends to the interior of the box body 1, and the end is connected to a rotating pipe 502. The rotating pipe 502 is arranged perpendicular to the water outlet pipe 5, and a rotating mechanism 6 is provided on the water outlet pipe 5. The rotating mechanism 6 includes a servo drive motor and two gears. The two gears are respectively arranged on the output shafts of the rotating pipe 502 and the servo drive motor, and the two gears are engaged. The servo drive motor and the gears can drive the water outlet pipe 5 to rotate, thereby causing the rotating pipe 502 to rotate accordingly. The inlet of the rotating pipe 502 will change its position height inside the box body 1, so that after flocculation and sedimentation, the inlet position of the rotating pipe 502 is adjusted according to the dividing line between the supernatant and the sediment, so that the supernatant is conveniently discharged from the box body 1 through the water outlet pipe 5. An observation window 7 is provided on one side of the box body 1, and the observation window 7 is located on one side of the rotating pipe 502, which is convenient for observing the sediment dividing line inside the box body 1, so as to adjust the position of the rotating pipe 502 and facilitate the discharge of the supernatant.

[0053] Example 2

[0054] In view of the above-mentioned sewage flocculation treatment equipment, this embodiment provides an electromagnetic flocculation sewage treatment method, comprising the following steps:

[0055] S1: Sewage to be treated is injected into the interior of the box 1 through the water inlet pipe 2, and gas is injected into the interior of the box 1 through the air inlet pipe 15 and the aeration pipe 13. The gas is ejected toward the gaps between the electrode plates 11 through the nozzles 14, thereby driving the sewage at the bottom of the box 1 into the gaps between the electrode plates 11. Since the aeration pipe 13 is arranged in the middle of the bottom end of the electrode plate 11, the sewage at the top flows back from both sides to the bottom of the box 1, forming a circulating agitation of the sewage;

[0056] S2: While the aeration tube 13 drives the sewage to circulate through the gaps of the electrode plates 11, the electrode plates 11 in the multiple parallel electrode plate groups are connected to direct current, generating an electric field between the electrode plates 11. The sewage to be treated flows into the gaps of the electrode plates 11. Iron, aluminum, etc. are used as anodes of the electrode plates 11. After the electrode plates 11 are connected to direct current, the soluble anodes lose electrons to form metal cations AI. 3+ 、Fe 2+ , and 0H in the solution - Generate metal hydroxide colloidal flocculants. This new ecological hydroxide has high activity and strong adsorption capacity. It combines with colloids, suspended matter, soluble pollutants, bacteria, viruses, etc. in the raw water to form larger flocs.

[0057] During this process, air is pressurized into the sewage through the aeration pipe 13 to generate bubbles. In conjunction with the electrolysis process, hydrogen and oxygen are respectively released at the cathode and anode, generating highly dispersed tiny bubbles. These bubbles then adhere to pollutants such as colloids and emulsions in the raw water and float to the water surface for separation.

[0058] And in the electrolysis process, the anions with lower electrode potential in the solution, such as OH - 、C1 - Active substances that lose electrons at the anode generate new, stronger oxidants. These active substances make pollutants lose electrons, causing oxidation and decomposition to reduce BOD5, CODcr, ammonia nitrogen, etc. in the original solution. High-valent or low-valent metal cations in the sewage gain electrons at the cathode and are directly reduced to low-valent cations or metal precipitates, thereby effectively transforming and removing soluble, colloidal and suspended pollutants in the water.

[0059] S3: While the aeration tubes 13 drive the sewage to circulate through the gaps between the electrode plates 11, magnetic powder is mixed with the sewage inside the box 1 at a dosage of 100 mg / L. Subsequently, the first solenoid valve 301 controls the amount of reagent in the drug storage tank 3, and PAM is added to the box 1 at a dosage of 0.5 mg / L. The sewage is stirred through the aeration tubes 13 for 15 minutes and the sedimentation time is 15 minutes. The combined effects of magnetic attraction and surface charge help the pollutants in the sewage to flocculate.

[0060] S4: During sedimentation, the injection of gas into the aeration pipe 13 is stopped, and the second electromagnetic coil 16 is turned on. The second electromagnetic coil 16 generates a magnetic field to adsorb the flocculent particles containing the magnetic powder, accelerating the sedimentation of the flocculent particles at the bottom of the box 1. After sedimentation, the sediment boundary line inside the box 1 is observed through the observation window 7. The servo drive motor and gears are used to drive the water outlet pipe 5 to rotate, and the position of the inlet of the rotating pipe 502 is adjusted so that the inlet of the rotating pipe 502 is downwardly close to the boundary line, thereby facilitating the discharge of the supernatant in the box 1.

[0061] S5: After the supernatant is discharged, the threaded rod 17 is rotated by the driving motor 10. Under the action of the threaded sleeve 18, the sealing plate 19 is lowered along the inner wall of the sewage pipe 8. At this time, the second electromagnetic coil 16 is closed, so that the flocculent containing magnetic powder enters the sewage pipe 8 along the funnel-shaped bottom of the box 1. At this time, the first electromagnetic coil 9 is opened. The first electromagnetic coil 9 generates a magnetic field to adsorb and fix the magnetic powder on the side wall of the sewage pipe 8, while the impurities are discharged through the sewage outlet 801, so that the magnetic powder is separated from the flocculent. At this time, the second electromagnetic valve 401 is closed, so that the exhaust pipe 4 is closed, and the gas ejected from the aeration pipe 13 is ejected through the sewage pipe 8, thereby blowing the magnetic powder adsorbed and fixed on the side wall of the sewage pipe 8. Since the magnetic powder is adsorbed and fixed, the impurities are blown out, further improving the magnetic powder separation effect. After the magnetic powder is separated, the threaded rod 17 is driven by the driving motor 10 to rotate in the opposite direction, so that the sealing plate 19 moves upward along the inner wall of the sewage pipe 8, pushing the magnetic powder back into the box 1. Repeat the above steps to treat the sewage again.

[0062] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A sewage flocculation treatment equipment, characterized in that: include: A box body (1), wherein a water inlet pipe (2) and a medicine storage tank (3) are provided on the top of the box body (1), and the medicine storage tank (3) is used to put medicine into the box body (1); A plurality of electrode plate groups, each of the electrode plate groups being arranged at intervals inside the box (1), each of the electrode plate groups comprising two electrode plates (11), with a gap being provided between the two electrode plates (11); an aeration pipe (13) disposed inside the box (1), the aeration pipe (13) being located in the middle portion below the electrode plates (11) and being arranged perpendicular to the plane on which the electrode plates (11) are located; The aeration pipe (13) is arranged horizontally, and a plurality of nozzles (14) are arranged at intervals on the top of the aeration pipe (13), each nozzle (14) faces the gap between the electrode plates (11), one end of the aeration pipe (13) is connected to an air inlet pipe (15), an exhaust pipe (4) is provided on the top of the box (1), and a second solenoid valve (401) is provided on the exhaust pipe (4); A sewage pipe (8) is provided at the bottom of the box body (1), wherein a sealing plate (19) is slidably connected to the interior of the sewage pipe (8), and a lifting mechanism is provided on the sealing plate (19) to drive the sealing plate (19) to move up and down inside the sewage pipe (8); and a first electromagnetic coil (9) disposed outside the sewage pipe (8) to absorb magnetic powder in the flocculation passing through the sewage pipe (8) and move upward through the sealing plate (19) to push the magnetic powder back into the box (1).

2. The sewage flocculation treatment equipment according to claim 1, characterized in that: The lifting mechanism comprises a driving motor (10), a threaded rod (17) and a threaded sleeve (18); the threaded sleeve (18) is fixedly connected to the sealing plate (19) and is threadedly connected to the threaded rod (17); the driving motor (10) is fixedly connected to the sewage pipe (8), and the output shaft of the driving motor (10) is connected to the bottom end of the threaded rod (17); a sewage outlet (801) is provided at the bottom of one side of the sewage pipe (8); and a sealing ring is provided on the outside of the sealing plate (19).

3. The sewage flocculation treatment equipment according to claim 1, characterized in that: The horizontal cross-section of the sewage pipe (8) is rectangular, and two first electromagnetic coils (9) are provided, and are respectively arranged on the two long sides of the sewage pipe (8).

4. The sewage flocculation treatment equipment according to claim 1, characterized in that: The bottom of the box body (1) is funnel-shaped, and a second electromagnetic coil (16) is provided at the bottom of the box body (1).

5. The sewage flocculation treatment equipment according to claim 1, characterized in that: An insulating plate (12) is provided between each of the electrode plate groups. A guide block (20) is provided at the bottom of the insulating plate (12). The guide block (20) is in a pointed cone shape and is located at the bottom of the electrode plate (11). Two guide plates (21) are provided between each of the electrode plate groups. The two guide plates (21) are in an arc shape and a trumpet shape.

6. The sewage flocculation treatment equipment according to claim 5, characterized in that: A top cover (101) is provided on the top of the box body (1), and each electrode plate group is fixedly connected to the bottom of the top cover (101). A bracket (102) is provided on the inner wall of the box body (1) to support each electrode plate group, and a hanging ring is provided on the top of the top cover (101).

7. The sewage flocculation treatment equipment according to claim 1, characterized in that: A pipeline is provided between the medicine storage tank (3) and the box body (1), a first electromagnetic valve (301) is provided on the pipeline, and a cover (302) is provided on the top of the medicine storage tank (3).

8. The sewage flocculation treatment equipment according to claim 1, characterized in that: A water outlet pipe (5) is provided at the bottom of one side of the box body (1), and a third solenoid valve (501) is provided on the water outlet pipe (5). One end of the water outlet pipe (5) extends into the interior of the box body (1), and the end is connected to a rotating pipe (502). The rotating pipe (502) is arranged vertically to the water outlet pipe (5). A rotating mechanism (6) is provided on the water outlet pipe (5), and the rotating mechanism (6) is used to drive the water outlet pipe (5) to rotate so that the rotating pipe (502) rotates accordingly. The rotating mechanism (6) includes a servo drive motor and two gears, and the two gears are respectively arranged on the output shaft of the rotating pipe (502) and the servo drive motor, and the two gears are meshed. An observation window (7) is provided on one side of the box body (1), and the observation window (7) is located on one side of the rotating pipe (502).

9. A method for treating wastewater by electromagnetic flocculation, characterized in that: The sewage flocculation treatment equipment according to any one of claims 1 to 8 comprises the following steps: S1: Sewage to be treated is injected into the box (1) through the water inlet pipe (2), and gas is injected into the box (1) through the aeration pipe (13). The gas enters the sewage and stirs the sewage; S2: The gas ejected from the aeration pipe (13) drives the sewage to circulate through the gaps of each electrode plate (11), connecting the electrode plates (11) in the multiple parallel electrode plate groups with direct current, generating an electric field between the electrode plates (11), and the electrode plates (11) dissolve Al 3+ or Fe 2+ Ions, and hydrolyze in sewage to produce flocculation reaction, while electrical flotation and redox reaction occur; S3: The magnetic powder is mixed with the sewage inside the box (1) at a dosage of 100 mg / L. Then, the dosage of the medicine in the medicine storage tank (3) is controlled by the first solenoid valve (301), and PAM is added to the inside of the box (1). The dosage of PAM is 0.5 mg / L. The sewage is stirred through the aeration pipe (13). The stirring time is 15 minutes and the sedimentation time is 15 minutes. S4: During precipitation, the second electromagnetic coil (16) is turned on to adsorb the flocculation containing the magnetic powder and accelerate the precipitation. After precipitation, the supernatant is discharged through the outlet pipe (5); S5: After the supernatant is discharged, it descends through the sealing plate (19), allowing the flocculation containing the magnetic powder to enter the sewage pipe (8). At this time, the first electromagnetic coil (9) is turned on. The first electromagnetic coil (9) adsorbs and fixes the magnetic powder on the side wall of the sewage pipe (8), so that the magnetic powder is separated from the flocculation. The gas ejected from the aeration pipe (13) blows the magnetic powder adsorbed and fixed on the side wall of the sewage pipe (8), so that the flocculation impurities are separated. After the magnetic powder is separated from the impurities, the magnetic powder is pushed back into the box (1) through the sealing plate (19). Repeat the above steps to treat the sewage again.

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