An integrated electromagnetic-acoustic coupling heavy oil wastewater treatment device

Abstract

This invention relates to an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, belonging to the technical field of water purification equipment. It includes a raw material tank with an inlet and a stirrer; a water pump pumps water from the raw material tank to a purified water tank via pipeline; the purified water tank has an outlet at the top and a sludge discharge outlet at the bottom; the purified water tank contains an ultrasonic generator, an ultrasonic receiver, a magnetic field device, and an electric field generator; the ultrasonic generator generates an ultrasonic field to break down the thickness of the oil-water interface film; the ultrasonic receiver eliminates the reflection and refraction of ultrasonic waves within the tank; the electric field generator generates an electric field to accelerate the sedimentation of magnetic particles; the magnetic field device generates a magnetic field to capture magnetic flocs formed by the combination of oil droplets, magnetic particles, and flocculants; the electric field generator is electrically connected to a transformer and a high-frequency, high-voltage pulse power supply. Under the combined coupling of electric force, ultrasonic field, and magnetic field, the problem of the difficulty in treating heavy oil wastewater is effectively solved.

Description

Technical Field

[0001] This invention relates to an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, belonging to the technical field of water purification equipment. Background Technology

[0002] As oilfields gradually enter the middle and late stages of development, the water content in produced fluids increases sharply, and the pressure on water treatment continues to rise. At the same time, the proportion of heavy oil development is gradually increasing, and the proportion of tertiary oil recovery technologies such as chemical flooding is also increasing. This results in increasingly severe oil-water emulsification in oilfield produced fluid wastewater, making oil-water separation more difficult. In addition, the content of suspended solids and heavy metal ions is high, and there are many complex and harmful components, which pose a great challenge to traditional physical and chemical methods for wastewater treatment.

[0003] Coagulation and flocculation are effective in removing suspended solids and metal ions, and are among the most effective methods for wastewater treatment. Magnetic flocculation, in the presence of a coagulant, involves adding magnetic particles and flocculants to form magnetic flocs. These flocs then settle rapidly when an external magnetic field is applied. Studies have found that adding magnetic particles—Fe3O4—to the flocculation reaction with polyaluminum chloride during the flocculation process results in excellent treatment efficiency, not only in high oil removal rates but also in rapid floc settling and shortened reaction time. Furthermore, it offers high recovery rates and can be reused after simple treatment, improving effectiveness while maintaining low cost.

[0004] However, due to the high degree of emulsification of oil components in the heavy oil wastewater produced by oil fields, direct treatment by magnetic flocculation is difficult. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an integrated electromagnetic-acoustic coupling device for treating heavy oily wastewater. While performing magnetic flocculation, a high-frequency pulsed electric field and an ultrasonic field are applied to the oily wastewater to demulsify it. Under the combined action of the electric field and ultrasound, the interfacial tension between oil and water decreases, causing the oil and water components to separate. Under the influence of the electric field, water droplets continuously coalesce into clean components. Due to the high water content, a high-frequency, high-voltage pulsed electric field is used to prevent short circuits. Simultaneously, a series of ultrasonic effects, such as stirring, collision, aggregation, cavitation, and negative pressure, facilitate the combination of oil droplets with magnetic particles and flocculants. After the oil droplets combine to form magnetic flocs, they rapidly settle and are captured under the influence of the magnetic field. To prevent some flocs from escaping, a subsequent inclined plate sedimentation device and a secondary magnetic field are used for secondary capture of the flocs, ensuring the cleanliness of the effluent. This achieves efficient pretreatment of heavy oily wastewater, effectively solving the problem of the difficulty in treating heavy oily wastewater and ensuring smooth production operation.

[0006] To achieve the above objectives, the technical solution of this application is an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, including a raw material tank, a purified water tank, and a water pump; the raw material tank is provided with an inlet and a stirrer, and the water pump pumps the wastewater, magnetic particles, and flocculant stirred by the stirrer in the raw material tank to the purified water tank through a pipeline; the purified water tank is provided with an exhaust port and a water outlet on the top of the tank, and a sludge discharge port on the bottom of the tank; the purified water tank is provided with an ultrasonic generator, an ultrasonic receiver, a magnetic field device, and an electric field generator.

[0007] An ultrasonic generator is used to produce an ultrasonic field to change the thickness of the oil-water interface film.

[0008] An ultrasonic receiver is used to eliminate the reflection and refraction of ultrasonic waves inside the tank.

[0009] An electric field generating device used to generate an electric field to accelerate the sedimentation of magnetic particles;

[0010] The magnetic field device is used to generate a magnetic field to capture the magnetic flocs formed by the combination of oil droplets, magnetic particles, and flocculants; the electric field generating device is electrically connected to the transformer and the high-frequency high-voltage pulse power supply.

[0011] Furthermore, the water purification tank is also equipped with an inclined plate sedimentation device, which is used to increase the sedimentation area of ​​magnetic flocs.

[0012] Furthermore, the water purification tank is also equipped with a first weir plate and a second weir plate, which are spaced apart. One end of the first weir plate has a certain gap with the top of the tank, and one end of the second weir plate has a certain gap with the bottom of the tank. The first and second weir plates divide the water purification tank into a coupling zone and a sedimentation zone. An ultrasonic generator is installed on the side wall of the tank in the coupling zone, and an ultrasonic receiver is installed on the first weir plate. The magnetic field device is a magnet, including magnet A and magnet B. Magnet A is fixed relative to the top and bottom of the tank in the coupling zone, and magnet B is fixed relative to the top and bottom of the tank in the sedimentation zone. The electric field generator is a number of electrode plates, and a suspension frame is installed on the inner wall of the top of the tank in the coupling zone. The electrode plates are spaced apart on the suspension frame. The inclined plate sedimentation device is a number of spaced V-shaped folding plates, and the openings of the V-shaped folding plates in the sedimentation zone face the bottom of the tank.

[0013] Furthermore, the electrode plate is a mesh electrode composed of smooth metal wires, which is set perpendicular to the horizontal axis of the tank. The direction of the electric field generated by the electrode plate is parallel to the direction of the horizontal axis, and a dense insulating layer is coated on the surface of the electrode plate.

[0014] Furthermore, the water purification tank is equipped with flushing pipes above magnets A and B located at the bottom of the tank. Multiple nozzles are arranged on the flushing pipes, and water is sprayed through the nozzles to discharge the magnetic flocs from the sludge discharge port.

[0015] Furthermore, the magnetic particles are Fe3O4, the flocculant is polyaluminum chloride, and the mass concentration of the flocculant in the raw material tank is 0.1-0.2%.

[0016] Furthermore, a diffuser and a bend are connected between the water pump and the purified water tank, with one end of the diffuser extending into the purified water tank.

[0017] Furthermore, a baffle is installed directly below the curved pipe inside the water purification tank to further increase the turbulence of the liquid and prevent magnetic particles from settling.

[0018] Furthermore, the water outlet is connected to the water collection pipe, which is located between the V-shaped folding plate and the magnet B on the top of the tank. The water collection pipe is parallel to the horizontal axis of the tank and has a downward-sloping water collection hole, which facilitates the entry of purified water and its discharge from the water outlet through the water collection pipe.

[0019] Furthermore, the bottom of the tank in the coupling zone is also provided with a drain port, so that when all the water in the tank needs to be drained, the water flows out from the drain port.

[0020] By adopting the above technical solution, the present invention can achieve the following technical effects:

[0021] (1) After the sewage, magnetic particles and flocculant in the raw material tank are fully stirred by the agitator, they enter the clean water tank through the expansion pipe and the bend pipe to ensure that the raw material liquid is in a turbulent state. A baffle is set below the bend pipe to further increase the turbulence of the liquid, avoid the sedimentation of magnetic particles, and effectively improve the water treatment efficiency.

[0022] (2) The electric field is generated by a high-frequency, high-voltage pulse power supply. The electric field parameters, including voltage amplitude, electric field frequency, and pulse width ratio, are easily adjustable. Compared with traditional DC and AC power supplies, this greatly reduces the risk of "electric field collapse" and short circuits due to excessive water content. Simultaneously, a wire mesh electrode plate composed of smooth metal wires is used to ensure the electric field strength while being placed perpendicular to the horizontal axis, preventing water droplet accumulation and adhesion that could cause short circuits. In the electric field, the water droplets aggregate faster under the action of dipole forces, making it easier for oil droplets to combine with magnetic particles and flocculants.

[0023] (3) The ultrasonic generation device generates a series of ultrasonic effects, such as stirring, collision, aggregation, cavitation, and negative pressure, which greatly reduce the thickness of the oil-water interface film, increase the water droplet aggregation rate, and facilitate the combination of oil droplets with magnetic particles and flocculants. Under the coupling effect of electric field force and ultrasonic waves, after the oil droplets combine with magnetic particles and flocculants to form magnetic flocs, they move rapidly downward under the action of magnetic field and are captured by magnets, which greatly increases the processing capacity.

[0024] (4) The first weir plate and the second weir plate divide the water tank into two parts. The upper part of the coupling zone is clean water, which flows through the first weir plate and the second weir plate to the sedimentation zone for sedimentation again, and then flows out through the upper water collection pipe. The treatment efficiency is improved by changing the flow channel. The whole treatment is a dynamic process. The equipment occupies a small area and has a large processing capacity. The magnetic particles and flocculants are metal compounds that can be recycled and reused, reducing costs.

[0025] (5) By setting up flushing pipes and sludge discharge ports, the settled magnetic flocs are flushed regularly to avoid accumulation that weakens the magnetic field effect.

[0026] (6) By setting up an inclined plate sedimentation device, the sedimentation area of ​​the magnetic flocs is increased when the sewage comes into contact with it, thereby further improving the water treatment effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the electrode plate in Embodiment 1 of the present invention.

[0029] The numbers in the diagram are as follows: 1. Raw material tank; 2. Feed inlet; 3. Water pump; 4. Diverging pipe; 5. Bend; 6. Baffle; 7. Ultrasonic generator; 8. Clean water tank; 9. Agitator; 10. Magnet A; 11. Sludge discharge port; 12. Magnet B; 14. Sludge flushing pipe; 15. V-shaped baffle; 16. Water collection pipe; 17. Water outlet; 18. First weir plate; 19. Suspension frame; 20. Exhaust port; 21. Electrode plate; 22. Transformer; 23. High-frequency high-voltage pulse power supply; 24. Ultrasonic receiving device; 25. Second weir plate; 26. Coupling zone; 27. Sedimentation zone; 28. Nozzle; 29. ​​Water collection hole; 30. Drain port. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments: the present application will be further described and illustrated using these examples.

[0031] Example 1:

[0032] like Figures 1-2As shown, this embodiment provides an electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, including a raw material tank 1, a purified water tank 8, and a water pump 3. The raw material tank 1 is provided with an inlet 2 and a stirrer 9. A diffuser 4 and a bend 5 are connected between the water pump 3 and the purified water tank 8. The diffuser 4 is connected to the bend 5. One end of the bend 5 extends into the purified water tank 8. A baffle 6 is provided directly below the bend 5. The baffle 6 is horizontally set on the inner side wall of the tank. The expansion angle of the diffuser 4 is between 10° and 20°. The downward inclination angle of the bend 5 is between 25° and 30°. An exhaust port 20 is provided above the bend 5 to adjust the pressure inside the tank. The water pump 3 pumps the wastewater, magnetic particles, and flocculant stirred by the stirrer 9 in the raw material tank 1 to the purified water tank 8 through pipeline.

[0033] The water purification tank 8 is equipped with an ultrasonic generator 7, an ultrasonic receiver 24, a magnetic field device, an electric field generator, and an inclined plate sedimentation device. The ultrasonic generator 7 generates an ultrasonic field to reduce the thickness of the oil-water interface film. The ultrasonic receiver 24 eliminates the reflection and refraction of ultrasonic waves within the tank. The electric field generator generates an electric field to accelerate the sedimentation of magnetic particles. The magnetic field device generates a magnetic field to capture magnetic flocs formed by the combination of oil droplets, magnetic particles, and flocculant. The electric field generator is electrically connected to a transformer 22 and a high-frequency, high-voltage pulse power supply 23. The inclined plate sedimentation device increases the sedimentation area of ​​the magnetic flocs.

[0034] The water purification tank 8 is further provided with a first weir plate 18 and a second weir plate 25. The first weir plate 18 and the second weir plate 25 are spaced apart and arranged perpendicular to the horizontal axis of the tank body. One end of the first weir plate 18 has a certain gap with the top of the tank, and one end of the second weir plate 25 has a certain gap with the bottom of the tank. The first weir plate 18 and the second weir plate 25 divide the water purification tank 8 into a coupling zone 26 and a sedimentation zone 27. An ultrasonic generator 7 is installed on the side wall of the tank body in the coupling zone 26, and an ultrasonic receiver 24 is installed on the first weir plate 18. The magnetic field device consists of magnets, including magnet A10 and magnet B12. Magnet A10 is fixed relative to the top and bottom of the tank in the coupling zone 26, and magnet B12 is fixed relative to the top and bottom of the tank in the sedimentation zone 27. The electric field generating device consists of several electrode plates 21. A suspension frame 19 is installed on the inner wall of the top of the tank in the coupling zone 26, and the electrode plates 21 are spaced apart on the suspension frame 19. The inclined plate sedimentation device consists of several spaced V-shaped folding plates 15. The openings of the V-shaped folding plates 15 in the tank body of the sedimentation zone 27 face the bottom of the tank. Both the bottom of the coupling zone 26 and the sedimentation zone 27 are provided with sludge discharge ports 11, and the bottom of the tank in the coupling zone is also provided with an air discharge port 30.

[0035] Above magnets A10 and B12 located at the bottom of water purification tank 8, sludge flushing pipes 14 are respectively provided. Multiple nozzles 28 are arranged on the sludge flushing pipes 14. Water is sprayed through the nozzles 28 to discharge the magnetic flocs from the sludge discharge port 11. Water outlet 17 is provided on the top of water purification tank 8. Water outlet 17 is connected to water collection pipe 16. Water collection pipe 16 is located between V-shaped baffle 15 and magnet B12. Water collection pipe 16 is parallel to the horizontal axis of the tank body and has downward-sloping water collection holes 29 to facilitate the entry of purified water and its discharge from water outlet 17 through water collection pipe 16.

[0036] The magnetic particles are Fe3O4, the flocculant is polyaluminum chloride, and the mass concentration of the flocculant in raw material tank 1 is 0.1-0.2%.

[0037] The transformer 22 is a 100:1 step-up transformer, which is connected to the suspension frame 19 and the electrode plate 21 via a cable.

[0038] A high-power agitator 9 is installed inside the raw material tank 1. Magnetic particles and flocculants are added into the raw material tank 1 through the feed inlet 2. After the sewage, magnetic particles and flocculants in the raw material tank 1 are fully stirred by the agitator 9, they are driven by the water pump 3 and enter the coupling zone 26 of the water purification tank 8 through the expansion pipe and the bend pipe 5. This ensures that the raw material liquid is in a turbulent state. A baffle 6 is installed below the bend pipe 5. The sewage collides with the baffle 6 and changes its flow direction, further increasing the turbulence of the liquid. This prevents the magnetic particles from settling prematurely and not contacting the sewage sufficiently, thus effectively improving the water treatment efficiency.

[0039] Electrode plate 21 covers the coupling zone 26 of the tank. Simultaneously, the ultrasonic generator 7 and ultrasonic receiver 24 in this zone are used to couple with the electric field. Two magnets A are used to create a magnetic field to accelerate the sedimentation of magnetic particles. In other words, the coupling zone 26 contains electric, magnetic, and acoustic fields. The electric field is formed by the electrode plate 21. Several electrode plates 21 are placed perpendicular to the horizontal axis of the tank. The electrode plates 21 are mesh electrodes composed of smooth metal wires, generating an electric field parallel to the horizontal axis. Multiple electrode plates 21 are used to form a strong electric field region. The surface of the electrode plates 21 is coated with a dense insulating layer. The mesh electrodes composed of smooth metal wires prevent water droplets from accumulating on the electrode surface and causing short circuits. To avoid electric field collapse and reduce the risk of short circuits, a high-frequency, high-voltage pulse power supply 23 is used for the electric field. Compared with traditional DC and AC power supplies, the high-frequency, high-voltage pulse power supply 23 is more suitable for liquids with high water content. By adjusting the electric field parameters, including voltage amplitude, electric field frequency, and pulse width ratio, "electric field collapse" can be effectively prevented. At the same time, the intermittent discharge of the pulsed electric field helps increase the vibration effect, which is beneficial for water droplet aggregation. The electrode plate 21 is connected to the power supply system via a suspension bracket 19. The power supply system includes a transformer 22 and a high-frequency high-voltage pulse power supply 23. The connection between the suspension bracket 19 and the tank body is coated with insulating paint, ensuring insulation between them. The magnetic field is generated by two magnets A10, which are in close contact with the inner wall of the tank. The magnetic field direction is perpendicular to the horizontal axis, pointing from the magnet A10 at the top of the tank to the magnet A10 at the bottom, causing magnetic particles to move downwards. Magnetic flocs are captured by the magnet A10 at the bottom of the tank. A flushing pipe 14 is horizontally positioned between the electrode plate 21 and the magnet A10 at the bottom of the tank. Multiple nozzles 28 are installed on the flushing pipe 14. The nozzles 28 accelerate the water flow, impacting the magnetic flocs captured on the magnet A10 to clean the magnet A10 and prevent accumulation that weakens the magnetic field. The magnetic flocs are quickly discharged from the sludge discharge port 11 for easy recycling and subsequent use. The ultrasonic field consists of an ultrasonic generator 7 and an ultrasonic receiver 24. The ultrasonic effect generated by the ultrasonic generator 7 permeates the coupling zone 26. A series of ultrasonic effects, such as stirring, collision, aggregation, cavitation, and negative pressure, reduce the interfacial film thickness and the oil-water interfacial tension, making oil droplets easier to separate. Simultaneously, the ultrasonic effect also helps to increase the turbulence of the wastewater. To avoid secondary emulsification, the ultrasonic receiver 24 is installed to absorb some of the ultrasonic energy, preventing excessive reflection of ultrasonic waves inside the tank. That is, while the wastewater generates ultrasonic effects in the coupling zone 26, the ultrasonic receiver 24 controls the range of ultrasonic wave emission within the coupling zone 26, while also preventing reflection and refraction of ultrasonic waves in the coupling zone 26, thus mitigating secondary emulsification.

[0040] The water treated in the coupling zone 26 may contain uncaptured magnetic flocs. To prevent some tiny flocs from escaping, the water flows into the sedimentation zone 27 between the first weir plate 18 and the second weir plate 25. The uncaptured magnetic flocs are then captured again by the inclined plate sedimentation device and the magnetic field. In other words, when the wastewater comes into contact with the V-shaped baffle plate 15, the sedimentation area increases. Under the action of the magnetic field, the magnetic flocs quickly settle to the bottom of the tank and are captured by the magnet B12. The nozzle 28 above the magnet B sprays water to impact the magnetic flocs, causing them to be discharged from the sludge discharge port 11, ensuring that the water meets the discharge standards. The clean water treated in the sedimentation zone 27 is discharged from the outlet 17 through the water collection pipe 16.

[0041] In practical applications, the wastewater inlet treatment capacity is 1000m³. 3 The treatment process was carried out at a temperature of 60℃, with an oil concentration of 5000 mg / L and a suspended solids concentration of 5000 mg / L. Magnetic particles at a concentration of 15 g / L and a flocculant concentration of 0.15% were added to raw material tank 1. The electric field parameters were adjusted as follows: voltage 5 kV, pulse width ratio 0.5, frequency 5 kHz; magnetic field strength 150 mT; and ultrasonic generator 7 with a frequency of 20 kHz and an oscillator amplitude of 10–80 μm. The treated wastewater showed reduced oil and suspended solids concentrations to below 1000 mg / L, meeting discharge standards.

[0042] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device, characterized in that, It includes a raw material tank (1), a purified water tank (8), and a water pump (3); the raw material tank (1) is equipped with a feed inlet (2) and a stirrer (9), and the water pump (3) pumps the sewage, magnetic particles and flocculant stirred by the stirrer (9) in the raw material tank (1) into the purified water tank (8) through a pipeline; the purified water tank (8) is equipped with an exhaust port (20) and a water outlet (17) on the top of the tank, and a sludge discharge port (11) at the bottom of the tank; the purified water tank (8) is equipped with an ultrasonic generator (7), an ultrasonic receiver (24), a magnetic field device and an electric field generator; An ultrasonic generator (7) is used to generate an ultrasonic field to change the thickness of the oil-water interface film. An ultrasonic receiver (24) is used to eliminate the reflection and refraction of ultrasonic waves inside the tank. An electric field generating device used to generate an electric field to accelerate the sedimentation of magnetic particles; A magnetic field device is used to generate a magnetic field to capture magnetic flocs formed by the combination of oil droplets, magnetic particles, and flocculants; an electric field generating device is electrically connected to a transformer (22) and a high-frequency high-voltage pulse power supply (23); a sloping plate sedimentation device is provided inside the water purification tank (8) to increase the sedimentation area of ​​the magnetic flocs; a first weir plate (18) and a second weir plate (25) are also provided inside the water purification tank (8), with the first weir plate (18) and the second weir plate (25) spaced apart, with a gap between one end of the first weir plate (18) and the top of the tank, and a gap between one end of the second weir plate (25) and the bottom of the tank; the first weir plate (18) and the second weir plate (25) divide the water purification tank (8) into a coupling zone (26) and a sedimentation zone (27); an ultrasonic generating device. (7) An ultrasonic receiving device (24) is installed on the side wall of the tank in the coupling zone (26). The magnetic field device is a magnet, including magnet A (10) and magnet B (12). Magnet A (10) is fixed relative to the top and bottom of the tank in the coupling zone (26), and magnet B (12) is fixed relative to the top and bottom of the tank in the sedimentation zone (27). The electric field generating device is a number of electrode plates (21). A suspension frame (19) is installed on the inner wall of the top of the tank in the coupling zone (26). The electrode plates (21) are spaced apart on the suspension frame (19). The inclined plate sedimentation device is a number of spaced V-shaped folding plates (15). The V-shaped folding plates (15) are set with their openings facing the bottom of the tank in the sedimentation zone (27).

2. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 1, characterized in that, The electrode plate (21) is a wire mesh electrode composed of smooth metal wires, which is set perpendicular to the horizontal axis of the tank. The direction of the electric field generated by the electrode plate (21) is parallel to the direction of the horizontal axis. The surface of the electrode plate (21) is coated with a dense insulating layer.

3. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 1, characterized in that, Inside the water purification tank (8), above the magnets A (10) and B (12) located at the bottom of the tank, there are sludge flushing pipes (14). Multiple nozzles (28) are arranged on the sludge flushing pipes (14). Water is sprayed through the nozzles (28) to discharge the magnetic flocs from the sludge discharge port (11).

4. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 1, characterized in that, A diffuser pipe (4) and a bend pipe (5) are connected between the water pump (3) and the water purification tank (8). The diffuser pipe (4) is connected to the bend pipe (5), and one end of the bend pipe (5) extends into the water purification tank (8).

5. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 1, characterized in that, The magnetic particles are Fe3O4, the flocculant is polyaluminum chloride, and the mass concentration of the flocculant in the raw material tank (1) is maintained at 0.1-0.2%.

6. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 4, characterized in that, A baffle (6) is installed directly below the inner bend (5) of the water purification tank (8).

7. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 3, characterized in that, The outlet (17) is connected to the water collection pipe (16). The water collection pipe (16) is located between the V-shaped folding plate (15) and the magnet B (12) on the top of the tank. The water collection pipe (16) is parallel to the horizontal axis of the tank and has a downward-sloping water collection hole (29) to facilitate the entry of purified water and discharge from the outlet (17) through the water collection pipe (16).

8. The electromagnetic-acoustic integrated coupling heavy oil wastewater treatment device according to claim 1, characterized in that, The bottom of the coupling zone (26) is also provided with an empty port (30), and when all the water in the tank needs to be discharged, the water flows out from the empty port (30).

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