Sewage flocculation treatment equipment and treatment method

Abstract

The invention discloses sewage flocculation treatment equipment and a treatment method, and relates to the technical field of sewage treatment.The sewage flocculation treatment equipment comprises a box body, a water inlet pipe and a medicine storage tank are arranged at the top of the box body, and the medicine storage tank is used for putting chemicals into the box body; the electrode plate groups are arranged in the box body at intervals, each electrode plate group comprises two electrode plates, and a gap is formed between the two electrode plates; the aeration pipe is arranged in the box body and is positioned in the middle of the lower part of the electrode plate. Sewage circularly passes through the gaps of the electrode plates through the aeration pipe, flocculants generated between the electrode plates are combined with pollutants in raw water to generate large flocculent bodies, PAM is added into the box body, the pollutants in the sewage are flocculated, the flocculates containing magnetic powder enter the sewage discharge pipe, the magnetic field adsorbs and fixes the magnetic powder, the magnetic powder is separated from the flocculates, and the sewage treatment efficiency is improved. Through upward movement of the sealing plate, the separated magnetic powder is recycled and pushed back into the box body, so that the next sewage treatment is facilitated.

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 vigorous development of science and technology and economy, the wastewater generated in the production process of petrochemical, electric power, mining and papermaking industries has gradually increased, and the wastewater will cause serious pollution to the environment. In order to save precious water resources and not pollute the environment, it is necessary to purify the sewage. In the current sewage treatment field, there are many types and styles of sewage treatment methods and sewage treatment equipment. As a new heavy metal wastewater treatment process, electroflocculation can use aluminum, iron and other metals as anodes to produce Al, Fe and other ions under the action of direct current. After a series of hydrolysis, polymerization and ferrous oxidation processes, it develops into various hydroxyl complexes, polynuclear hydroxyl complexes and even hydroxides, so that the colloidal impurities and suspended impurities in the wastewater are condensed and precipitated and separated. Magnetic flocculation is a technology that adds magnetic powder to the ordinary flocculation process to make the flocs settle at a high speed, which can greatly improve the treatment effect and sedimentation rate of the original flocculation process.

[0003] However, in the 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 magnetic powder recovery in magnetic flocculation, the flocs formed by impurities and magnetic powder are usually transferred to another device to separate and recover 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 magnetic powder recovery. 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 method which integrates electric flocculation and magnetic flocculation, is easy to operate, improves the flocculation effect and sedimentation rate, and is convenient for recovering magnetic powder.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A sewage flocculation treatment device, comprising: 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; A plurality of electrode plate groups, each of which is arranged in an interval inside the box, and each electrode plate group includes two electrode plates, and a gap is provided between the two electrode plates; The aeration pipe is arranged inside the box, the aeration pipe is located in the middle below the electrode plate, and is arranged vertically to the plane where each electrode plate is located; A sewage pipe is arranged at the bottom of the box body, and a sealing plate is slidably connected inside the sewage pipe. A lifting mechanism is arranged on the sealing plate to drive the sealing plate to move up and down inside the sewage pipe; 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.

[0006] 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 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.

[0007] Furthermore, the horizontal cross-section of the sewage pipe is rectangular, and two first electromagnetic coils are provided and are respectively arranged on the long sides of both sides of the sewage pipe.

[0008] Furthermore, the bottom of the box is funnel-shaped, and a second electromagnetic coil is arranged at the bottom of the box.

[0009] Furthermore, the aeration pipe is arranged horizontally, and a plurality of nozzles are arranged at intervals on the top of the aeration pipe, each nozzle faces the gap between the electrode plates, one end of the aeration pipe is connected to the air inlet pipe, the top of the box is provided with an exhaust pipe, and a second solenoid valve is provided on the exhaust pipe.

[0010] 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 in an arc shape, and are in a trumpet shape.

[0011] 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 lifting ring is provided on the top of the top cover.

[0012] 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.

[0013] 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 shafts 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.

[0014] 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: 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; S2: The gas ejected from the aeration pipe drives the sewage to circulate through the gaps of the electrode plates, connecting the electrode plates in the multiple parallel electrode plates to direct current, generating an electric field between the electrode plates, and dissolving A1 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, and the dosage of the magnetic powder is 100 mg / L. Then, the first solenoid valve controls the amount of the reagent in the medicine storage tank, and PAM is added into the box. The dosage of PAM is 0.5 mg / L. The sewage is stirred through the aeration pipe. The stirring time is 15 min, and the sedimentation time is 15 min. S4: During precipitation, the second electromagnetic coil is turned on to adsorb the flocculation containing magnetic powder to accelerate precipitation. After precipitation, the supernatant is discharged through the outlet pipe; S5: After the supernatant is discharged, the sealing plate descends, allowing the flocculated liquid 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 flocculated liquid. 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 flocculated 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.

[0015] The beneficial effects of the present invention are: 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 inside the box to circulate and stir. 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 generate larger flocs, thereby improving the flocculation effect. 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 an integral module by a crane, so that each electrode plate group can be easily replaced. The aeration pipe is used to pressurize the sewage to generate bubbles, and in conjunction with the electrolysis process, hydrogen and oxygen are precipitated on the cathode and anode respectively, generating highly dispersed tiny bubbles, which adhere to the colloids, emulsions and other pollutants in the raw water and float to the water surface to be separated, thereby improving the sewage treatment effect; While the aeration tube drives the sewage to circulate through the gaps between the electrode plates, the magnetic powder inside the box is mixed 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 flocculation containing magnetic powder, so that the flocculation is accelerated to settle at the bottom of the box, thereby improving the sewage treatment efficiency; 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; 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, and 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 body, which is convenient for the next sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the three-dimensional structure of a sewage flocculation treatment device proposed by the present invention; Figure 2 This is a three-dimensional cross-sectional structural schematic diagram of a sewage flocculation treatment device proposed by the present invention; Figure 3 This is a schematic cross-sectional view of a sewage flocculation treatment device proposed by the present invention; Figure 4 This is a left-side structural cross-sectional view of a sewage flocculation treatment device proposed by the present invention; Figure 5 This is a right side structural sectional view of a sewage flocculation treatment device proposed by the present invention.

[0017] 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

[0018] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0019] The embodiments of the present invention are described in detail below, and examples of the embodiments 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 cannot be understood as limiting the present invention.

[0020] 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 drawings, and are only for the convenience of describing this patent and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0021] In the description of this patent, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0022] Example 1 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.

[0023] The sewage flocculation treatment equipment comprises a box body 1, a plurality of electrode plate groups, an aeration pipe 13, a sewage pipe 8 and a first electromagnetic coil 9; A water inlet pipe 2 is provided on the top of the box body 1, and the water inlet pipe 2 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 pipeline is provided between the medicine storage tank 3 and the box body 1, and a first solenoid valve 301 is provided on the pipeline. A cover 302 is provided on the top of the medicine storage tank 3. The medicine storage tank 3 is used to put medicine into the box body 1, and the first solenoid valve 301 can control the amount of medicine put in. 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.

[0024] 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, and the lifting ring facilitates the crane equipment to lift the top cover 101 together with each electrode plate group as an integral module to make it leave the box body 1, thereby facilitating the replacement of each electrode plate group.

[0025] The electrode plate groups are arranged at intervals inside the box 1, and each electrode plate group includes two electrode plates 11. A gap is provided between the two electrode plates 11, and an insulating plate 12 is provided between 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 the electrode plate groups. 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 1, which is convenient for the sewage to come to the bottom of the box 1 from the outside, thereby improving the sewage circulation and stirring effect.

[0026] The aeration pipe 13 is horizontally arranged inside the box body 1. The aeration pipe 13 is located in the middle below the electrode plate 11 and is arranged vertically to the plane where the electrode plates 11 are located. 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. The aeration pipe 13 can spray gas upward, thereby driving the sewage in the middle of the box body 1 to enter the gap between the electrode plates 11 upward, and then circulate from both sides to the bottom of the box body 1, so that the sewage is circulated and stirred inside the box body 1.

[0027] The drain pipe 8 is arranged at the bottom of the box body 1, and a drain port 801 is arranged 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 they are respectively arranged on the long sides of both sides of the drain pipe 8. This allows the first electromagnetic coil 9 to adsorb 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, and at the same time ensuring that the magnetic powder will not be blown out.

[0028] A sealing plate 19 is slidably connected inside the sewage pipe 8, and a lifting mechanism is provided on the sealing plate 19. The lifting mechanism includes 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 sealing ring is provided on the outside of the sealing plate 19. The driving 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.

[0029] 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. When stirring is performed, the second solenoid valve 401 is opened 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.

[0030] 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 vertically with the water outlet pipe 5. 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 meshed. The servo drive motor and the gears can drive the water outlet pipe 5 to rotate, so that the rotating pipe 502 rotates accordingly, and the inlet of the rotating pipe 502 will change the position height inside the box body 1. Therefore, after flocculation and sedimentation, the inlet position of the rotating pipe 502 is adjusted according to the boundary 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, so that the boundary line of the sediment inside the box body 1 can be observed, so that the position of the rotating pipe 502 can be adjusted, so as to facilitate the discharge of the supernatant.

[0031] Example 2 In view of the above-mentioned sewage flocculation treatment equipment, this embodiment provides an electromagnetic flocculation sewage treatment method, comprising the following steps: S1: Inject the sewage to be treated into the box 1 through the water inlet pipe 2, and inject gas into the box 1 through the air inlet pipe 15 and the aeration pipe 13. The gas is sprayed toward the gap between the electrode plates 11 through the nozzles 14, thereby driving the sewage at the bottom of the box 1 into the gap 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 stirring of the sewage; S2: While the aeration tube 13 drives the sewage to circulate through the gaps of the electrode plates 11, direct current is connected to the electrode plates 11 in the plurality of parallel electrode plates, an electric field is generated between the electrode plates 11, and 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 powered by direct current, the soluble anodes lose electrons to form metal cations AI. 3+ , Fe 2+ , 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. In this process, air is added to the sewage through the aeration pipe 13 to generate bubbles, and in conjunction with the electrolysis process, hydrogen and oxygen are precipitated at the cathode and anode, respectively, to generate highly dispersed tiny bubbles, which adhere to the pollutants such as colloids and emulsions in the raw water and float to the water surface to be separated; 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 are used to make pollutants lose electrons, which plays an oxidative decomposition role to reduce BOD5, CODcr, ammonia nitrogen, etc. in the original solution. High-valent or low-valent metal cations in sewage gain electrons at the cathode and are directly reduced to low-valent cations or metal precipitation, thereby effectively transforming and removing soluble, colloidal and suspended pollutants in the water. S3: While the aeration pipe 13 drives the sewage to circulate through the gaps of the electrode plates 11, the magnetic powder inside the box 1 is mixed with the sewage, and the amount of magnetic powder added is 100 mg / L. Then, the amount of 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 amount of PAM added 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. The combined effect of magnetic attraction and surface charge helps the pollutants in the sewage to flocculate; S4: During sedimentation, stop injecting gas into the aeration pipe 13, and turn on the second electromagnetic coil 16. The second electromagnetic coil 16 generates a magnetic field to adsorb the flocculation containing magnetic powder, so that the flocculation is accelerated to settle at the bottom of the box 1. After sedimentation, the sediment boundary line inside the box 1 is observed through the observation window 7, so that the servo drive motor and the gear 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 downward close to the boundary line, so as to facilitate the discharge of the supernatant in the box 1; S5: After the supernatant is discharged, the threaded rod 17 is driven to rotate 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 flocculation containing magnetic powder enters the sewage pipe 8 along the funnel-shaped bottom of the box body 1. At this time, the first electromagnetic coil 9 is opened, and 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 flocculation, and 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 will be 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, and the magnetic powder is pushed back into the box body 1. Repeat the above steps to treat the sewage again.

[0032] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A sewage flocculation treatment device, 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 in an interval manner inside the box (1), each of the electrode plate groups comprising two electrode plates (11), and 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 below the electrode plates (11) and arranged perpendicular to the plane where the electrode plates (11) are located; A sewage pipe (8) is arranged at the bottom of the box body (1), the interior of the sewage pipe (8) is slidably connected to a sealing plate (19), and the sealing plate (19) is provided with a lifting mechanism to drive the sealing plate (19) to move up and down inside the sewage pipe (8); and a first electromagnetic coil (9) which is arranged outside the sewage pipe (8) to absorb the magnetic powder in the flocculation passing through the sewage pipe (8) and moves 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 outer side 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 discharge pipe (8) is rectangular, and two first electromagnetic coils (9) are provided, and are respectively arranged on the two long sides of the sewage discharge 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: 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 body (1), and a second solenoid valve (401) is provided on the exhaust pipe (4).

6. 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 in a trumpet shape.

7. The sewage flocculation treatment equipment according to claim 6, 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).

8. 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 solenoid valve (301) is provided on the pipeline, and a cover (302) is provided on the top of the medicine storage tank (3).

9. 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 tube (502). The rotating tube (502) and the water outlet pipe (5) are arranged vertically. 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 tube (502) rotates accordingly. The rotating mechanism (6) comprises a servo drive motor and two gears, and the two gears are respectively arranged on the output shaft of the rotating tube (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 tube (502).

10. An electromagnetic flocculation wastewater treatment method, characterized in that: The steps include: S1: Injecting sewage to be treated into the interior of the box (1) through the water inlet pipe (2), and injecting gas into the interior of the box (1) through the aeration pipe (13), so that 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 between the electrode plates (11), connecting the electrode plates (11) in the plurality of parallel electrode plates to direct current, generating an electric field between the electrode plates (11), and dissolving 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 and sewage are mixed inside the box (1), and the amount of magnetic powder added is 100 mg / L. Then, the amount of the reagent in the medicine storage tank (3) is controlled by the first solenoid valve (301), and PAM is added into the box (1). The amount of PAM added 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 sedimentation, the second electromagnetic coil (16) is turned on to adsorb the flocculation containing the magnetic powder to accelerate the sedimentation. After sedimentation, the supernatant is discharged through the outlet pipe (5); S5: After the supernatant is discharged, the sealing plate (19) descends, allowing the flocculated liquid containing the magnetic powder to enter the sewage pipe (8). At this time, the first electromagnetic coil (9) is turned on, and 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 flocculated liquid. 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 flocculated 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). The above steps are repeated to treat the sewage again.

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