A device for remediating oil-contaminated soil

Abstract

This application belongs to the field of soil remediation technology and relates to a device for remediating oil-contaminated soil, comprising, in sequence: a mixing module, an ultrasonic module, a centrifugation module, and a separation module. The mixing module is used to mix the oil-contaminated soil with a remediation solution to obtain a chemical mixture. The ultrasonic module, connected to a transmitting module, is used to ultrasonically treat the chemical mixture under the action of grinding beads emitted by the transmitting module to obtain an ultrasonic mixture. The grinding beads have different sizes and are matched to the molecular weight of the remediation solution. The centrifugation module is used to centrifuge the ultrasonic mixture to obtain a centrifuged liquid. The separation module is used to separate the centrifuged liquid to obtain water and oil, thereby completing the remediation of the oil-contaminated soil. Using this application, water and oily substances can be effectively separated and recovered from oil-contaminated soil.

Description

Technical Field

[0001] This application relates to the field of soil remediation technology, and in particular to a device for remediating oily soil. Background Technology

[0002] Currently, the study of the characteristics of oil sludge and oil-contaminated soil, as well as the development of recycling methods, are a global focus. Due to the significant increase in oil and gas production, waste management from related business activities has become a significant and urgent environmental issue. During drilling, drill cuttings containing hydrocarbons, heavy metals, and polymers severely pollute soil and water, while oil spills during oil production have numerous negative impacts, leading to soil degradation and widespread oil pollution.

[0003] Among existing oil-contaminated soil remediation technologies, leaching is an effective physicochemical method that uses flocculants to separate and recover oil contaminants.

[0004] However, this method still faces problems such as uneven flocculation effect and reagent waste in application, which limits the further improvement of processing efficiency. Summary of the Invention

[0005] Therefore, it is necessary to provide a device for remediating oil-contaminated soil that can effectively separate and recover water and oily substances from oil-contaminated soil, thereby improving the soil remediation effect and efficiency.

[0006] An oil-contaminated soil remediation device includes, in sequence: a mixing module, an ultrasonic module, a centrifugation module, and a separation module;

[0007] The mixing module is used to mix oil-contaminated soil with remediation solution to obtain a chemical mixture;

[0008] The ultrasonic module is connected to the transmitting module and is used to perform ultrasonic treatment on the chemical mixture under the action of the grinding beads emitted by the transmitting module to obtain an ultrasonic mixture; the grinding beads have different sizes and are matched with the molecular weight of the repair solution;

[0009] The centrifugation module is used to centrifuge the ultrasonic mixture and obtain centrifuged liquid;

[0010] The separation module is used to separate the centrifuged liquid to obtain water and oil, thereby completing the remediation of oil-contaminated soil.

[0011] In one embodiment, the mixing module includes: a first conveyor, a storage tank, and a mixing pool;

[0012] The first conveyor is located above the mixing tank and is used to transport oily soil to the mixing tank;

[0013] The storage tank is located above the mixing tank and is used to store the repair solution and place the repair solution in the mixing tank;

[0014] The mixing tank is used to mix the remediation solution with the oily soil to obtain a chemical mixture.

[0015] In one embodiment, the mixing module further includes: a stirrer;

[0016] The stirrer is located in the mixing tank for stirring the chemical mixture.

[0017] In one embodiment, the launching module includes, in sequence, a gas tank, a gas valve, a control valve, and a hopper;

[0018] The gas tank is used to store gas to provide pneumatic power;

[0019] The gas valve is used to control the opening and closing of the gas tank;

[0020] The control valve is used to control the opening and closing of the hopper;

[0021] The hopper is used to store grinding beads so that, when the control valve is opened, the grinding beads are emitted to the ultrasonic module by the action of the air tank.

[0022] In one embodiment, a recovery module is further provided between the ultrasonic module and the centrifugation module to recover the grinding beads;

[0023] The recycling module includes: a magnetic plate and a vibrating screen;

[0024] The magnetic plate is located between the ultrasonic module and the centrifugal module to use magnetic force to draw out the grinding beads in the ultrasonic mixture and transport them to the vibrating screen.

[0025] The vibrating screen has multiple layers to screen grinding beads of different sizes and convey them to different hoppers.

[0026] In one embodiment, the ultrasonic module includes a first pump and an ultrasonic reactor connected together.

[0027] The first pump is used to pump the chemical mixture into the ultrasonic reactor;

[0028] The ultrasonic reactor includes: a cavity, an electroacoustic transducer, and an ultrasonic generator.

[0029] One end of the cavity is connected to an electroacoustic transducer and an ultrasonic generator respectively; the cavity is provided with a pumping inlet, a transmitting inlet and an outlet, the pumping inlet is connected to the mixing module, the transmitting inlet is connected to the transmitting module, and the outlet is connected to the centrifugation module;

[0030] The electroacoustic transducer is used for energy conversion from electrical energy to acoustic energy;

[0031] The ultrasonic generator is used to generate ultrasonic waves.

[0032] In one embodiment, the ultrasonic reactor further includes: a waveguide;

[0033] The cavity is hollow to form an accommodating space; the waveguide is disposed in the accommodating space and connected to one end of the cavity, and is used to adjust the frequency and amplitude of the sound wave waveform.

[0034] In one embodiment, the waveguide is a rod-shaped structure, and a portion of the cross-section of the rod-shaped structure has a stepped structure.

[0035] In one embodiment, the centrifugation module includes: a hydrocyclone, a centrifuge, a second conveyor, and a centrifugal liquid collection tank;

[0036] The hydrocyclone is positioned above the centrifuge to place the ultrasonic mixture inside the centrifuge;

[0037] The centrifuge is used to centrifuge the ultrasonic mixture to obtain remediated soil and centrifuged liquid, and the remediated soil is placed in the second conveyor and the centrifuged liquid is placed in the centrifuged liquid collection tank;

[0038] The second conveyor is located below the centrifuge and is used to transport the remediated soil out.

[0039] The centrifuge fluid collection tank is used to collect centrifuge fluid.

[0040] In one embodiment, the separation module includes: a second pump, a separator, a water tank, and an oil tank;

[0041] The second pump is connected to both the centrifuge module and the separator to pump the centrifuged liquid into the separator.

[0042] The separator is connected to the water tank and the oil tank respectively to separate the centrifuged liquid into water and oil, which are then placed in the water tank and the oil tank respectively.

[0043] The pool is used to collect water;

[0044] The oil pool is used to collect oily substances.

[0045] The aforementioned oil-contaminated soil remediation device, considering the different characteristics of flocculants with different molecular weights during the leaching process, matches grinding beads of corresponding diameters to flocculants of different molecular weights. Grinding beads of different diameters collide with flocculants of different molecular weights. High molecular weight flocculants are paired with grinding beads of diameter A to enhance their dispersion effect, provide higher shear force, enhance the dispersibility and activity of the flocculant, and prevent agglomeration; low molecular weight flocculants are paired with grinding beads of diameter B to provide higher collision energy and accelerate their binding with pollutant particles; medium molecular weight flocculants are paired with grinding beads of diameter C to improve the flocculation reaction rate. Furthermore, the grinding bead diameters satisfy A:B:C = 1:3:2, thereby achieving efficient flocculation and separation, realizing the remediation of oil-contaminated soil, and significantly improving the flocculation effect. Separation efficiency: Within the chamber of the ultrasonic reactor, the flocculant and grinding beads collide and mix thoroughly under ultrasonic vibration. Ultrasonic energy promotes the separation of oil particles from the soil, further enhancing the dispersion and effectiveness of the flocculant. This achieves a better match between flocculants of different molecular weights and grinding beads, resulting in highly efficient flocculation. During the treatment of oil-contaminated soil, the oil-contaminated soil and flocculant are fully mixed, optimizing the effectiveness of flocculants of different molecular weights. This not only significantly improves flocculation efficiency and accelerates the aggregation of oil particles and the separation of soil particles, but also reduces the amount of flocculant used, lowers treatment costs, and improves the economic and environmental friendliness of the treatment process. Simultaneously, it greatly enhances the remediation efficiency of oil-contaminated soil and the utilization rate of reagents, providing reliable technical support for efficient and environmentally friendly soil remediation. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of an oil-contaminated soil remediation device in one embodiment;

[0047] Figure 2 This is a schematic diagram of an ultrasonic reactor in an oil-contaminated soil remediation device according to one embodiment.

[0048] Figure label:

[0049] 1. First conveyor; 2. Mixing tank; 3. Storage tank; 4. Agitator; 5. First pump; 6. Ultrasonic reactor; 7. Magnetic plate; 8. Hydrocyclone; 9. Centrifuge; 10. Second conveyor; 11. Centrifugal liquid collection tank; 12. Second pump; 13. Separator; 14. Water tank; 15. Oil tank; 16. Ultrasonic generator; 17. Electroacoustic transducer; 18. Waveguide; 19. Cavity; 20. Outlet; 21. Pump inlet; 22. Emission inlet; 23. Vibrating screen; 24. Hopper; 25. Control valve; 26. Pressure sensor; 27. Air valve; 28. Air tank. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0051] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0052] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this application, "multiple sets" means at least two sets, such as two sets, three sets, etc., unless otherwise explicitly specified.

[0053] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection, an electrical connection, a physical connection, or a wireless communication connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0054] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0055] This application provides a device for remediating oil-contaminated soil, such as... Figure 1 and Figure 2 As shown, in one embodiment, it includes: a mixing module, an ultrasonic module, a centrifugation module, a separation module, a transmitting module, and a recovery module, wherein the mixing module, ultrasonic module, centrifugation module, and separation module are connected in sequence, the transmitting module is connected to the ultrasonic module, and the recovery module is located between the ultrasonic module and the centrifugation module.

[0056] 1. Hybrid Module.

[0057] The mixing module is used to mix oil-contaminated soil with remediation fluid to obtain a chemical mixture. The mixing module includes: a first conveyor, a storage tank, a mixing pool, and a mixer.

[0058] 1) A first conveyor 1 is located above the mixing tank and is used to transport oily soil to the mixing tank. The first conveyor is equipped with a weight sensor to ensure that the ratio of soil to liquid is within a preset range.

[0059] 2) Storage tank 3 is located above the mixing tank and is used to store the repair solution. The repair solution is evenly placed in the mixing tank through a pipe equipped with a temperature sensor and a flow controller. Specifically, the repair solution can be a flocculant.

[0060] 3) Mixing tank 2 is used to mix the remediation solution with the oily soil to obtain a chemical mixture.

[0061] 4) A stirrer 4 is located in the mixing tank to stir the chemical mixture, ensuring thorough mixing and uniform solubility. For example, a propeller stirrer is used.

[0062] 2. Ultrasound module.

[0063] The ultrasonic module is used to ultrasonically treat a chemical mixture under the action of grinding beads emitted by the transmitting module, and to obtain an ultrasonic mixture. The ultrasonic module includes: a first pump and an ultrasonic reactor.

[0064] 1) The first pump 5 is connected to both the mixing tank and the ultrasonic reactor, and is used to pump the chemical mixture into the ultrasonic reactor.

[0065] 2) The ultrasonic reactor 6 is used to ultrasonically treat and activate chemical mixtures under the action of grinding beads emitted by the transmitting module, and to obtain ultrasonic mixtures, avoiding precipitation caused by conventional stirring. The ultrasonic reactor is a tubular ultrasonic flow reactor, including: an electroacoustic transducer, an ultrasonic generator, a cavity, and a waveguide.

[0066] Electroacoustic transducers 17 are located at one end of the cavity and are used for energy conversion from electrical energy to acoustic energy. There can be multiple transducers, such as four.

[0067] An ultrasonic generator 16 is located at one end of the cavity and inside the electroacoustic transducer, and is used to generate ultrasonic waves.

[0068] One end of the cavity 19 is connected to an electroacoustic transducer and an ultrasonic generator respectively; the cavity is provided with a pump inlet 21, a transmission inlet 22 and an outlet 20. The pump inlet is connected to the mixing module, the transmission inlet is connected to the transmission module and the outlet is connected to the centrifugal module.

[0069] The cavity is hollow to form an accommodating space; a waveguide 18 is disposed in the accommodating space and connected to an ultrasonic generator at one end of the cavity to adjust the frequency and amplitude of the sound wave waveform; the waveguide is a rod-shaped structure, and part of the cross-section of the rod-shaped structure has a stepped structure perpendicular to the axis of the rod-shaped structure, so that the mixture is exposed to the ultrasonic wave area, so that each volume unit can be fully mixed, ensuring the mixing in the ultrasonic impact zone, thereby enhancing the grinding process.

[0070] 3. Centrifuge module.

[0071] The centrifugation module is used to centrifuge the ultrasonic mixture to obtain centrifuged liquid. The centrifugation module includes: a hydrocyclone, a centrifuge, a second conveyor, and a centrifuged liquid collection tank.

[0072] 1) The hydrocyclone 8 is connected to the ultrasonic module and is located above the centrifuge to place the ultrasonic mixture in the centrifuge. It is also used to perform preliminary treatment of the particles in the ultrasonic mixture and can continuously purify the water flow.

[0073] 2) Centrifuge 9 is used to centrifuge the ultrasonic mixture to obtain repaired soil and centrifuged liquid (oil-water mixture), and to place the repaired soil in the second conveyor and the centrifuged liquid in the centrifuged liquid collection tank. It is also used to further process the particles of the ultrasonic mixture to reduce the soil particle size.

[0074] 3) The second conveyor 10 is located below the centrifuge and is used to transport the remediated soil out.

[0075] 4) The centrifugal liquid collection tank 11 is located below the centrifuge and is used to collect the centrifugal liquid.

[0076] 4. Separate modules.

[0077] The separation module is used to separate the centrifuged liquid into water and oil, thus completing the remediation of oil-contaminated soil. The separation module includes: a second pump, a separator, a water tank, and an oil tank.

[0078] 1) The second pump 12 is connected to the centrifugal liquid collection tank of the centrifugal module and the separator of the separation module respectively, so as to pump the centrifugal liquid into the separator.

[0079] 2) The separator 13 is connected to the water tank and the oil tank respectively to separate the centrifuged liquid into water and oil, and place them in the water tank and the oil tank respectively.

[0080] 3) Pool 14 is used to collect water.

[0081] 4) Oil pool 15 is used to collect oily substances.

[0082] 5. Transmission module.

[0083] The launching module is used to launch grinding beads to the ultrasonic module to enhance the dispersion and reaction of the flocculant. The launching module includes: an air tank, an air valve, a pressure sensor, a control valve, a hopper, and an air pipe, with the grinding beads contained in the hopper.

[0084] 1) Gas cylinder 28 is connected to a gas pipe for storing gas (e.g., nitrogen) to provide aerodynamic force through gas pressure.

[0085] 2) Gas valve 27 is connected to the gas tank and is used to control the opening and closing of the gas tank to control whether gas enters the gas pipe.

[0086] 3) Pressure sensor 26 is located on the air pipe between the air valve and the control valve to detect air pipe pressure.

[0087] 4) Control valve 25 is connected to the hopper and is used to control the opening and closing of the hopper to control whether the grinding beads enter the air pipe.

[0088] 5) Hopper 24 is used to store and recover grinding beads so that the grinding beads can be emitted to the ultrasonic module under the action of the air tank when the control valve is opened.

[0089] 6) The air tube is connected to the air tank and the emission inlet of the upper cavity of the ultrasonic module, so that the gas drives the grinding beads to be injected into the ultrasonic reactor along the air tube.

[0090] 7) The grinding beads have different sizes and are matched with the molecular weight of the repair solution. The grinding beads can be made of metal materials, such as steel balls.

[0091] 6. Recycling module.

[0092] The recycling module automatically collects used grinding beads for reuse, forming a closed-loop recycling system. This avoids frequent replacement of grinding beads, extending the lifespan of the device, significantly reducing operating costs, and increasing system stability and sustainability. The recycling module includes a magnetic plate and a vibrating screen.

[0093] 1) The magnetic plate 7 is located between the ultrasonic module and the centrifugal module to use magnetic force to draw out the grinding beads in the ultrasonic mixture and transport them to the vibrating screen.

[0094] 2) The vibrating screen 23 is connected to the magnetic plate and has multiple screens to screen grinding beads of different sizes and convey them to different hoppers according to different sizes.

[0095] In one embodiment, the molecular weight of the flocculant is matched with different sizes of grinding beads; specifically: when using a high molecular weight flocculant (molecular weight greater than 1 million), it is matched with small diameter grinding beads (e.g., grinding beads with a diameter of 0.5 mm); when using a low molecular weight flocculant (molecular weight less than 100,000), it is matched with large diameter grinding beads (e.g., grinding beads with a diameter of 1.5 mm); when using a medium molecular weight flocculant (molecular weight between 100,000 and 1 million), it is matched with medium diameter grinding beads (e.g., grinding beads with a diameter of 1 mm). The different sizes of grinding beads are matched with a multi-layer vibrating screen; specifically: 0.5 mm grinding beads are matched with a 0.7 mm pore size screen, 1 mm grinding beads are matched with a 1.2 mm pore size screen, and 1.5 mm grinding beads are matched with a 1.7 mm pore size screen.

[0096] The working process of this embodiment is as follows:

[0097] 1) The first conveyor transports the oily soil or sludge to the mixing tank. The oily soil accounts for 50-60% of the total volume of the mixture. The storage tank transports the stored remediation solution (such as flocculant) evenly to the mixing tank through the pipe located at the top of the mixing tank. The remediation solution accounts for 40-50%. The top of the mixing tank is equipped with a propeller agitator. It is initially stirred at a medium speed (150-300 rad / min) for 5 minutes, and then stirred at a high speed (600-900 rad / min) for 10 minutes to fully mix the oily soil and the remediation solution to form a chemical mixture.

[0098] 2) The first pump pumps the chemical mixture from the mixing tank into the chamber of the ultrasonic reactor. Based on the molecular weight of the added flocculant, the control valve of the corresponding diameter grinding bead hopper is opened to select grinding beads of the matching diameter. The gas canister then propels the grinding beads from the hopper into the chamber of the ultrasonic reactor. The chamber is equipped with a waveguide connected to an electroacoustic transducer, which generates ultrasonic frequencies, thereby grinding the mixture. The ultrasonic reactor has a capacity of 0.7 m³. 3 / min, working frequency is 18-27kHz, ultrasonic treatment for 5-10 minutes to form ultrasonic mixture;

[0099] 3) The ultrasonic mixture undergoes preliminary solid-liquid separation in a hydrocyclone for 30 minutes, and then enters a centrifuge. The centrifuge is run at 5000 rad / min and centrifuged for 5-10 minutes to separate the ultrasonic mixture into remediation soil and centrifuged liquid. The remediation soil is transported out by a second conveyor at the bottom of the centrifuge, and the centrifuged liquid is collected in a centrifuged liquid collection tank at the bottom of the centrifuge.

[0100] 4) The second pump pumps the centrifugal liquid from the centrifugal liquid collection tank into the separator. The separator separates the centrifugal liquid into water and oil. The water is collected in the water tank at the bottom of the separator for further use, and the oil is collected in the oil tank at the bottom of the separator for further processing into petroleum products.

[0101] This application employs a chemical and structural approach to the treatment of materials, effectively separating and recovering oily substances from oil-contaminated soil while simultaneously achieving water recycling, reducing the use of chemical agents, and improving automation and operational efficiency. By mounting the equipment-equipped container on a truck or processing site powered by a diesel or gasoline generator, the consumption of chemical agents used in the separation can be reduced, the process can be fully automated, and the number of operators can be minimized, offering advantages such as mobility, autonomy, low operating costs, and high efficiency. This mobile and autonomous device is suitable for on-site treatment of oil-contaminated soil, and the treated sludge and oily substances can be further processed. The solid phase containing residual petroleum products can be further processed and used as raw material for manufacturing road or building materials. This invention allows treated oil-contaminated soil to be used as a lubricating additive in drilling fluids, replacing crude oil, and the treated sludge can be used as a separating fluid to separate oil-based drilling fluids from water-based mud.

[0102] The aforementioned oil-contaminated soil remediation device, considering the different characteristics of flocculants with different molecular weights during the leaching process, matches grinding beads of corresponding diameters to flocculants of different molecular weights. Grinding beads of different diameters collide with flocculants of different molecular weights. High molecular weight flocculants are paired with grinding beads of diameter A to enhance their dispersion effect, provide higher shear force, enhance the dispersibility and activity of the flocculant, and prevent agglomeration; low molecular weight flocculants are paired with grinding beads of diameter B to provide higher collision energy and accelerate their binding with pollutant particles; medium molecular weight flocculants are paired with grinding beads of diameter C to improve the flocculation reaction rate. Furthermore, the grinding bead diameters satisfy A:B:C = 1:3:2, thereby achieving efficient flocculation and separation, realizing the remediation of oil-contaminated soil, and significantly improving the flocculation effect. Separation efficiency: Within the chamber of the ultrasonic reactor, the flocculant and grinding beads collide and mix thoroughly under ultrasonic vibration. Ultrasonic energy promotes the separation of oil particles from the soil, further enhancing the dispersion and effectiveness of the flocculant. This achieves a better match between flocculants of different molecular weights and grinding beads, resulting in highly efficient flocculation. During the treatment of oil-contaminated soil, the oil-contaminated soil and flocculant are fully mixed, optimizing the effectiveness of flocculants of different molecular weights. This not only significantly improves flocculation efficiency and accelerates the aggregation of oil particles and the separation of soil particles, but also reduces the amount of flocculant used, lowers treatment costs, and improves the economic and environmental friendliness of the treatment process. Simultaneously, it greatly enhances the remediation efficiency of oil-contaminated soil and the utilization rate of reagents, providing reliable technical support for efficient and environmentally friendly soil remediation.

[0103] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A device for remediating oil-contaminated soil, characterized in that, It includes, in sequence, a mixing module, an ultrasonic module, a centrifugation module, and a separation module; The mixing module is used to mix oil-contaminated soil with remediation solution to obtain a chemical mixture; The ultrasonic module is connected to the transmitting module and is used to perform ultrasonic treatment on the chemical mixture under the action of the abrasive beads emitted by the transmitting module to obtain an ultrasonic mixture; the abrasive beads have different sizes and are matched with the molecular weight of the repair solution; The centrifugation module is used to centrifuge the ultrasonic mixture and obtain centrifuged liquid; The separation module is used to separate the centrifuged liquid to obtain water and oil, so as to complete the remediation of oily soil. The launching module includes, in sequence: a gas tank, a gas valve, a control valve, and a hopper; The gas tank is used to store gas to provide pneumatic power; The gas valve is used to control the opening and closing of the gas tank; The control valve is used to control the opening and closing of the hopper; The hopper is used to store grinding beads so that, when the control valve is opened, the grinding beads are emitted to the ultrasonic module by the action of the air tank.

2. The device for remediating oil-contaminated soil according to claim 1, characterized in that, The mixing module includes: a first conveyor, a storage tank, and a mixing pool; The first conveyor is located above the mixing tank and is used to transport oily soil to the mixing tank; The storage tank is located above the mixing tank and is used to store the repair solution and place the repair solution in the mixing tank; The mixing tank is used to mix the remediation solution with the oily soil to obtain a chemical mixture.

3. The device for remediating oil-contaminated soil according to claim 2, characterized in that, The mixing module further includes: a stirrer; The stirrer is located in the mixing tank for stirring the chemical mixture.

4. A device for remediating oil-contaminated soil according to any one of claims 1 to 3, characterized in that, It also includes a recovery module disposed between the ultrasonic module and the centrifugation module to recover the grinding beads; The recycling module includes: a magnetic plate and a vibrating screen; The magnetic plate is located between the ultrasonic module and the centrifugal module to use magnetic force to draw out the grinding beads in the ultrasonic mixture and transport them to the vibrating screen. The vibrating screen has multiple layers to screen grinding beads of different sizes and convey them to different hoppers according to their size.

5. A device for remediating oil-contaminated soil according to any one of claims 1 to 3, characterized in that, The ultrasonic module includes a first pump and an ultrasonic reactor connected together. The first pump is used to pump the chemical mixture into the ultrasonic reactor; The ultrasonic reactor includes: a cavity, an electroacoustic transducer, and an ultrasonic generator. One end of the cavity is connected to an electroacoustic transducer and an ultrasonic generator respectively; the cavity is provided with a pumping inlet, a transmitting inlet and an outlet, the pumping inlet is connected to the mixing module, the transmitting inlet is connected to the transmitting module, and the outlet is connected to the centrifugation module; The electroacoustic transducer is used for energy conversion from electrical energy to acoustic energy; The ultrasonic generator is used to generate ultrasonic waves.

6. The device for remediating oil-contaminated soil according to claim 5, characterized in that, The ultrasonic reactor further includes: a waveguide; The cavity is hollow to form an accommodating space; the waveguide is disposed in the accommodating space and connected to one end of the cavity, and is used to adjust the frequency and amplitude of the sound wave waveform.

7. The device for remediating oil-contaminated soil according to claim 6, characterized in that, The waveguide is a rod-shaped structure, and a portion of the cross-section of the rod-shaped structure has a stepped structure.

8. A device for remediating oil-contaminated soil according to any one of claims 1 to 3, characterized in that, The centrifugation module includes: a hydrocyclone, a centrifuge, a second conveyor, and a centrifugal liquid collection tank; The hydrocyclone is positioned above the centrifuge to place the ultrasonic mixture inside the centrifuge; The centrifuge is used to centrifuge the ultrasonic mixture to obtain remediated soil and centrifuged liquid, and the remediated soil is placed in the second conveyor and the centrifuged liquid is placed in the centrifuged liquid collection tank; The second conveyor is located below the centrifuge and is used to transport the remediated soil out. The centrifuge fluid collection tank is used to collect centrifuge fluid.

9. A device for remediating oil-contaminated soil according to any one of claims 1 to 3, characterized in that, The separation module includes: a second pump, a separator, a water tank, and an oil tank; The second pump is connected to both the centrifuge module and the separator to pump the centrifuged liquid into the separator. The separator is connected to the water tank and the oil tank respectively to separate the centrifuged liquid into water and oil, which are then placed in the water tank and the oil tank respectively. The pool is used to collect water; The oil pool is used to collect oily substances.

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