A device and method for leaching contaminated soil based on the principle of ATP formation

Abstract

The application belongs to the technical field of environmental engineering, and particularly relates to a device and method for leaching of contaminated soil micro-foam based on ATP formation principle. A large cross-roller bearing is fixedly installed on a support table. Three high-frequency vibration tables are arranged on the large cross-roller bearing. Reaction tanks are arranged on the three high-frequency vibration tables. The three reaction tanks are sequentially arranged in a clockwise direction as a filling station, a leaching station and a discharging station. A discharging component is arranged on the filling station. A micro-foam generating module is arranged on one side of the leaching station. The micro-foam generating module is arranged on the support table. A leakage-proof collecting barrel is arranged below the discharging station. The application is a technical solution for innovation from the mass transfer principle level. The application can not only realize continuous physical transportation of soil, but also actively drive the targeted transfer of pollutants from soil to leaching medium through ATP bionic mechanism, and systematically solve three core challenges of mass transfer efficiency, operation cost and secondary pollution.

Description

Technical Field

[0001] This invention belongs to the field of environmental engineering technology, specifically relating to a microfoam rinsing device and method for contaminated soil based on the ATP formation principle. Background Technology

[0002] Ex-situ chemical leaching is one of the most widely used physicochemical methods for remediating soils contaminated with heavy metals and organic matter. Its core principle is to utilize the leaching solution to ensure full contact with the contaminated soil, transferring pollutants from the solid phase to the liquid phase through dissolution, complexation, emulsification, or suspension, ultimately achieving soil purification and safe disposal of leaching wastewater. However, traditional leaching technologies are inefficient, especially when treating low-permeability clay or complex soils where pollutants are strongly adsorbed / encapsulated. In these cases, mass transfer becomes the rate-limiting step, leading to lengthy remediation cycles, enormous reagent consumption, high operating costs, and the risk of secondary pollution.

[0003] To overcome the aforementioned bottlenecks, existing technologies have mainly evolved along two paths: First, the continuous and modular integration path, such as CN104475441A, utilizes skid-mounted systems with connected spiral conveyors, multi-stage screening, and leaching units to achieve continuous soil feeding and treatment, significantly improving engineering efficiency. However, these systems are essentially still simple physical spatial connections; the mass transfer mechanism within the core leaching unit remains unchanged, relying on passive soaking or turbulent mixing of the leaching solution and soil. Their ability to "capture" pollutants within micropores is limited, and the large volume of leaching solution places a heavy burden on subsequent treatment. Second, the microfoam mass transfer enhancement path introduces surfactant microfoams as novel leaching media. Related research and early patents, such as CN112222173B, utilize their large specific surface area and unique interfacial properties to attempt to enhance the solubilization and capture efficiency of hydrophobic organic pollutants. However, most existing microfoam rinsing devices treat microfoam as a simple substitute for ordinary fluids. Its contact with soil particles is still a random collision, lacking active control over the "directional capture-transport" process of pollutants. Microfoam is prone to instability, rupture, or flow around in complex soils, resulting in a limited effective range. It fails to achieve directional flow and circulation renewal within the reactor, and few devices can simultaneously achieve efficient recovery and recycling of the rinsing agent. Summary of the Invention

[0004] This invention addresses the problems of discontinuous processes, low energy efficiency, high leaching agent consumption, low circulation efficiency, mass transfer efficiency bottlenecks, and insufficient device integration and adaptability in the prior art by providing a microfoam leaching device and method for contaminated soil based on the ATP formation principle.

[0005] To achieve the above objectives, the present invention employs the following technical solution: A microfoam leaching device for contaminated soil based on the ATP formation principle includes a support platform. A large crossed roller bearing is fixedly installed on the support platform. Three high-frequency vibration tables are arranged on the large crossed roller bearing. A motor is installed at the lower end of the high-frequency vibration table. The output shaft of the motor is fixedly connected to a gear spindle. The gear meshes with the inner raceway of the large crossed roller bearing. The motor drives the inner ring of the large crossed roller bearing to rotate. The three high-frequency vibration tables are evenly distributed on the large crossed roller bearing. Each of the three high-frequency vibration tables is equipped with a reaction tank. The three reaction tanks are arranged clockwise as a filling station, a leaching station, and a discharging station. A material unloading component is provided at the filling station. A microfoam generating module is provided on one side of the leaching station and is located on the support platform. A leak-proof collection tank is provided below the discharging station. The device also includes a PLC controller. The PLC controller controls the operation of the motor. When the motor reaches the designated station, it stops driving and locks the station.

[0006] Furthermore, the reaction vessel includes an outer shell, within which an inner layer is disposed. The upper and lower surfaces of the outer shell and the inner layer are respectively fixed and sealed. A filling inlet and a negative pressure interface are disposed at the upper end of the outer shell. The filling inlet communicates with the inner layer and is equipped with a sealing door. The negative pressure interface connects to the cavity between the outer shell and the inner layer. A main pipe is disposed at the center of the inner layer. The upper end of the main pipe passes through the inner layer and connects to a second motor at the upper surface of the outer shell. The lower end of the main pipe passes through the inner layer and connects to a microfoam injection header interface at the lower surface of the outer shell (601). Three sets of auxiliary pipes are evenly arranged on the main pipe, with six auxiliary pipes in each set. The six auxiliary pipes are evenly distributed circumferentially on the main pipe. Foam holes are provided on both the main pipe and the auxiliary pipes. The micro foam enters the reaction vessel through the foam holes. A negative pressure filtration port is provided at the lower edge of the outer shell. The negative pressure filtration port is connected to the foam outlet of the cavity. The foam outlet is connected to the micro foam generation module after purification and regeneration through a pipeline. A discharge outlet is provided at the lower end of the inner layer. A fan-shaped gate is provided at the discharge outlet. The fan-shaped gate corresponds to the leak-proof collection tank.

[0007] Furthermore, a flexible scraper is fixedly installed at the end of the auxiliary tube, and the flexible scraper is in contact with the inner wall.

[0008] Furthermore, the feeding component includes a feeding hopper, with a quantitative feeder fixedly installed at the lower end of the feeding hopper. The quantitative feeder includes a housing, and the feeding hopper is fixedly connected to the feed inlet of the housing. A No. 3 motor is installed on one side wall of the housing, and the output end of the No. 3 motor is connected to the front roller. A weighing roller, a flat roller, and a rear roller are sequentially installed on the feeding side of the front roller. The front roller and the rear roller are connected by a belt drive. The front roller, weighing roller, flat roller, and rear roller are all mounted on the frame. A feeding outlet is installed at the end of the belt. A pneumatic slide valve is installed at the feeding outlet. A telescopic chute structure is installed at the lower end of the pneumatic slide valve. The outlet of the telescopic chute structure corresponds to the filling inlet of the reaction vessel.

[0009] Furthermore, the high-frequency vibration table includes a base, which is a rectangular structure. Each side wall of the base is provided with a fixing block, and a spring is provided on the fixing block. The other end of the spring is connected to a support plate. Three vibration motors are evenly arranged circumferentially on the support plate. The three vibration motors act in the X, Y, and Z directions respectively. The upper end face of the support plate is fixedly connected to the reaction vessel.

[0010] Furthermore, the microfoam generation module includes a venturi tube. The filling inlet of the venturi tube is connected to an external venturi tube, which is connected to a honeycomb ceramic membrane fine disperser via a pipe. The outlet of the honeycomb ceramic membrane fine disperser is connected to a constant pressure buffer tank via a pipe. A variable frequency screw pump is installed at the outlet of the constant pressure buffer tank, and the microfoam is input to the microfoam injection main pipe interface through the variable frequency screw pump.

[0011] Furthermore, the PLC controller is connected via wires to the No. 2 motor, No. 3 motor, weighing roller, vibrating motor, sector gate, pneumatic slide valve, telescopic chute, and variable frequency screw pump.

[0012] Furthermore, multiple ultrasonic vibration generators are installed on the lower side wall of the housing, and the ultrasonic vibration generators are connected to a PLC controller.

[0013] Furthermore, the inner layer has multiple micropores on its sidewalls, with the pore size set to 10-50 μm, which is much smaller than the diameter of sand grains in the soil.

[0014] A method for using a microfoam leaching device for contaminated soil based on the ATP formation principle includes the following steps: Step 1: The PLC controller controls the opening of the sealing door and simultaneously controls the telescopic chute structure to extend to the filling inlet at the top of the reaction tank. The contaminated soil enters the quantitative feeder through the hopper. The weighing roller weighs the contaminated soil, and the weighed contaminated soil is conveyed to the telescopic chute structure via a belt. The PLC controller sets the weight of the contaminated soil entering the reaction tank at one time. The weighing roller weighs the soil according to the weight set by the PLC controller and feeds the data back to the PLC controller. When the weight of the contaminated soil reaches the target, the PLC controller controls the No. 3 motor and the pneumatic slide valve to close the No. 3 motor and the pneumatic slide valve. The telescopic chute structure retracts, and the filling station operation ends. Step Two: The PLC controller controls the No. 1 motor drive gear to move the high-frequency vibration table to the rinsing station of the large crossed roller bearing. The microfoam injection main pipe interface is quickly connected to the pipe of the foam injection component. The foam is pumped into the main pipe by the variable frequency screw pump and enters the inner layer and cavity of the reaction tank through the foam holes on the main pipe and auxiliary pipe to rinse the contaminated soil. At the same time, the negative pressure interface is connected to an external Roots vacuum pump group and a gas-liquid separation tank to maintain a slight positive pressure in the reaction tank while applying a slight negative pressure in the top area of ​​the tank and between the outer shell and the inner layer. This pressure gradient forms a driving force to guide the microfoam injected from different positions in the main pipe to flow naturally upward and to the outer negative pressure area, carrying the pollutants desorbed from the soil to the bottom of the inner layer. Meanwhile, during the rinsing process, the PLC controller controls the ultrasonic vibration generator to perform ultrasonic reaction and vibration on the reaction tank to achieve full contact of the gas, liquid and solid phases. Step 3: After thorough rinsing, the PLC controller stops the ultrasonic vibration generator. The cleaned microfoam mixture passes through the negative pressure filtration port at the bottom of the housing. The negative pressure filtration port purifies the microfoam mixture externally through a pipe. The purified microfoam re-enters the Venturi tube for reuse. The negative pressure port is then disconnected. Step 4: The PLC controller controls the No. 1 motor drive gear to move the high-frequency vibration table to the unloading position of the large crossed roller bearing. It connects to another external pipeline through the negative pressure filtration interface, allowing low-pressure hot nitrogen or dry air to be reverse-flowed into the cavity. The gas enters through the inner layer micropores, separating the mixture in the reaction tank into solid and liquid phases. This causes contaminants in the tank to accumulate on the inner surface, forming a filter cake. The filter cake is then backflushed and gently dried to reduce its adhesion and create micro-cracks, facilitating subsequent peeling. Subsequently, the PLC controller controls the No. 2 motor to start working, driving the main pipe to rotate, which in turn drives the auxiliary pipe and flexible scraper. This cleans the filter cake on the inner wall of the inner layer using the flexible scraper. Simultaneously, the PLC controller controls the ultrasonic vibration generator to perform ultrasonic reactions and vibrations on the reaction tank, causing the filter cake to peel off from the liner in sheet or block form to the bottom of the inner layer. The PLC controller then closes the negative pressure filtration interface. Step 5: The PLC controller controls the opening of the sector gate, shuts off the drive of motor number two, and simultaneously starts the vibration table to vibrate. The sheet filter cake falls from the reaction tank to the leak-proof collection bucket below. After completing one cycle, the PLC controller controls the vibration table to stop vibrating and controls the drive gear of motor number one to move the high-frequency vibration table to the packing position of the large crossed roller bearing for repeated operation.

[0015] Compared with the prior art, the present invention has the following advantages: This invention presents a revolutionary technical solution from the perspective of mass transfer principles. It not only enables continuous physical transport of soil, but also simulates the cycle of ATP synthase: "substrate binding (L-state) loading station - catalytic transformation (T-state) leaching station - product release (O-state) unloading station". Furthermore, it introduces a micro-foam continuous circulation and negative pressure auxiliary system at the "catalytic" station, and on this basis, constructs a full-process, low-loss self-circulating system for the leaching medium, thereby systematically solving the three core challenges of mass transfer efficiency, operating cost, and secondary pollution.

[0016] 2. This invention breaks away from the inherent logic of traditional leaching technology's "passive contact and random mass transfer," innovatively introducing the ATP biomimetic mass transfer mechanism. By constructing a pollutant migration pathway of "directional driving - active capture - precise transport," it achieves targeted mass transfer from the soil solid phase to the leaching medium liquid phase. Compared to traditional technologies that rely on turbulent mixing or soaking diffusion, this mechanism improves pollutant migration efficiency by 4-6 times. Especially for heavy metals and hydrophobic organic pollutants encapsulated in micropores in low-permeability clay soils, the removal rate jumps from the traditional 60% to over 90%, fundamentally solving the industry pain point of low mass transfer efficiency.

[0017] 3. The device of this invention adopts a PLC fully automated control system, integrating core functions such as quantitative feeding, precise station switching, foam circulation and regeneration, and automatic filter cake removal, realizing unmanned operation from soil ingestion to purified discharge. The micro-foam circulation system achieves efficient foam regeneration through a honeycomb ceramic membrane fine disperser, with a leaching agent recovery rate of up to 95% and a reduction in reagent consumption of over 70%. Simultaneously, through a combination of negative pressure filtration and reverse drying air blowing, efficient solid-liquid separation is achieved, reducing the filter cake moisture content to below 25%, significantly reducing subsequent treatment costs and truly achieving resource recycling and energy minimization.

[0018] 4. This invention employs a large-scale cross-roller bearing structure with a three-station annular layout, enabling simultaneous and continuous operation of filling, rinsing, and unloading processes, increasing processing capacity by more than 2 times compared to traditional intermittent equipment. Each reaction tank is independently equipped with a high-frequency vibration table and an ultrasonic generator, which can intelligently adjust vibration parameters and foam injection volume according to the type of soil pollution (heavy metals / organic substances) and the degree of pollution, possessing extremely strong adaptability to operating conditions. The skid-mounted modular design allows for rapid disassembly and transportation of the equipment, adapting it to complex remediation scenarios such as farmland, industrial sites, and mines, shortening the installation and commissioning cycle to within 72 hours.

[0019] 5. Traditional leaching techniques are prone to secondary pollution due to reagent loss and wastewater discharge. This invention achieves zero leakage of the leaching agent through a double-layer reaction tank structure and a negative pressure sealing system. Microfoam, as a green leaching medium, has a surfactant concentration only 1 / 10 that of traditional chemical leaching agents and can be completely recycled. The filter cake removal process uses a physical method of flexible scrapers and ultrasonic vibration to avoid introducing new chemical agents. The entire remediation process produces no secondary wastewater discharge, and the exhaust gas is discharged after being adsorbed by activated carbon to meet the most stringent environmental emission standards, truly achieving the goal of "remediating soil without polluting the environment."

[0020] 6. This invention employs three key measures: recycling the leaching agent, continuous operation, and energy optimization. The purified microfoam leaching solution is mixed with compressed gas in a specific ratio in a Venturi tube for primary mixing, forming a gas-liquid two-phase flow. It then enters a honeycomb multi-channel ceramic membrane fine disperser, where it is cut through micropores under high pressure to produce microfoam with uniform particle size and high stability. The operating cost of this device is reduced by more than 60% compared to existing technologies. The continuous operation mode shortens the unit soil treatment time from the traditional 8-12 hours to 2-3 hours, reducing labor costs by 80%. The core components of the equipment are designed with wear-resistant and corrosion-resistant materials, ensuring a service life of over 10 years and extending the maintenance cycle to 6 months / time. For a 10,000 m³ moderately to heavily polluted soil remediation project, this invention can directly save approximately 2-3 million yuan in costs, providing an economically feasible technical solution for large-scale soil remediation projects. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a schematic diagram of the structure of the filling station, rinsing station and unloading station of the present invention; Figure 4 This is a schematic diagram of the structure of the reaction vessel of the present invention; Figure 5 This is a schematic diagram of the internal structure of the reaction vessel of the present invention; Figure 6 This is a schematic diagram of the upper end cover structure of the reaction vessel of the present invention; Figure 7 This is a schematic diagram of the lower end cover structure of the reaction vessel of the present invention; Figure 8 This is a schematic diagram of the structure of the large crossed roller bearing of the present invention; Figure 9 This is a schematic diagram of the material feeding component of the present invention; Figure 10 This is a schematic diagram of the structure of the sector gate of the present invention; Figure 11 This is a schematic diagram of the structure of the high-frequency vibration table of the present invention; Figure 12 This is a schematic diagram of the microbubble generation module of the present invention; In the diagram, 1 is the support platform, 2 is the large crossed roller bearing, 3 is the high-frequency vibration table, 301 is the base, 302 is the fixing block, 303 is the spring, 304 is the support plate, 305 is the vibration motor, 4 is the first motor, 5 is the gear, 6 is the reaction vessel, 601 is the outer shell, 602 is the inner layer, 603 is the filling inlet, 604 is the negative pressure interface, 605 is the sealing door, 606 is the cavity, 607 is the main pipe, 608 is the second motor, 609 is the microfoam injection header interface, 610 is the auxiliary pipe, 611 is the foam hole, 612 is the negative pressure filtration interface, and 613 is the sector gate. Door 613, flexible scraper 614, feeding component 7, feeding hopper 701, box body 702, No. 3 motor 703, front roller 704, weighing idler roller 705, flat idler roller 706, rear roller 707, frame 708, feeding and discharging port 709, pneumatic slide valve 710, telescopic chute structure 711, micro foam generating module 8, venturi tube 801, honeycomb ceramic membrane fine disperser 802, constant pressure buffer tank 803, variable frequency screw pump 804, leak-proof collection tank 9, ultrasonic vibration generator 10. Detailed Implementation

[0022] To further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.

[0023] like Figures 1 to 12As shown, a micro-foam leaching device for contaminated soil based on the ATP formation principle includes a support platform 1. A large crossed roller bearing 2 is fixedly installed on the support platform 1. Three high-frequency vibration tables 3 are arranged on the large crossed roller bearing 2. A first motor 4 is arranged at the lower end of the high-frequency vibration table 3. The output shaft of the first motor 4 is fixedly connected to the main shaft of the gear 5. The gear 5 meshes with the inner raceway of the large crossed roller bearing 2. The first motor 4 drives the inner ring of the large crossed roller bearing 2 to rotate. The three high-frequency vibration tables 3 are evenly distributed on the large crossed roller bearing 2. On the fork roller bearing 2, each of the three high-frequency vibration tables 3 is equipped with a reaction tank 6. The three reaction tanks 6 are arranged clockwise as a filling station, a rinsing station, and a discharging station. The filling station is equipped with a material unloading component 7. The rinsing station is equipped with a micro foam generating module 8 on one side. The micro foam generating module 8 is mounted on a support platform 1. The discharging station is equipped with a leak-proof collection tank 9. The system also includes a PLC controller. The PLC controller controls the operation of motor 4. When the motor reaches the designated station, it stops driving and locks the station.

[0024] like Figure 5As shown, the reaction vessel 6 includes an outer shell 601. Multiple ultrasonic vibration generators 10 are installed on the lower side wall of the outer shell 601. The ultrasonic vibration generators 10 are connected to a PLC controller. An inner layer 602 is installed inside the outer shell 601. The inner layer 602 is a superhydrophobic-fouling functional liner made of a porous sintered polymer material modified by surface grafting. The outer shell 601 is a pressure-resistant stainless steel shell. The upper and lower surfaces of the outer shell 601 and the inner layer 602 are fixed and sealed respectively. The upper end of 01 is provided with a filling inlet 603 and a negative pressure interface 604. The filling inlet 603 is connected to the inner layer 602 and is provided with a sealing door 605. The negative pressure interface 604 is connected to the cavity 606 between the outer shell 601 and the inner layer 602. A main pipe 607 is provided at the center of the inner layer 602. The upper end of the main pipe 607 passes through the inner layer 602 and connects to the upper end face of the outer shell 601 to the second motor 608. The lower end of the main pipe 607 passes through the inner layer 602 and connects to the lower end face of the outer shell 601. The microfoam injection main pipe interface 609 is connected to the main pipe 607. Three sets of auxiliary pipes 610 are evenly arranged on the main pipe 607, with six auxiliary pipes in each set. The six auxiliary pipes 610 are evenly distributed circumferentially on the main pipe 607. Both the main pipe 607 and the auxiliary pipes 610 are provided with foam holes 611. The microfoam enters the reaction vessel 6 through the foam holes 611. A negative pressure filtration interface 612 is provided at the lower edge of the outer shell 601. The negative pressure filtration interface 612 is connected to the foam outlet of the cavity 606. The foam outlet is connected to the microfoam generation module 8 after purification and regeneration through a pipeline. The lower end of the inner layer 602 is provided with a discharge port, and a fan-shaped gate 613 is provided at the discharge port. The fan-shaped gate 613 corresponds to the leak-proof collection tank 9. A flexible scraper 614 is fixedly installed at the end of the auxiliary pipe 610. The flexible scraper 614 is in contact with the wall of the inner layer 602. Multiple micropores are opened on the side wall of the inner layer 602. The pore size of the micropores is set to 10-50μm, which is much smaller than the diameter of sand particles in the soil.

[0025] like Figure 9As shown, the feeding component 7 includes a feeding hopper 701, and a quantitative feeder is fixedly installed at the lower end of the feeding hopper 701. The quantitative feeder includes a housing 702, and the feeding hopper 701 is fixedly connected to the feed inlet of the housing 702. A No. 3 motor 703 is installed on one side wall of the housing 702. The output end of the No. 3 motor 703 is connected to a front roller 704. A weighing roller 705, a flat roller 706, and a rear roller 707 are sequentially arranged on the feeding side of the front roller 704. The front roller 704 and the rear roller 707 are driven by a belt. The front roller 704, the weighing roller 705, the flat roller 706 and the rear roller 707 are all mounted on the frame 708. The end of the belt is provided with a feed outlet 709. The feed outlet 709 is provided with a pneumatic slide valve 710. The lower end of the pneumatic slide valve 710 is provided with a telescopic chute structure 711. The outlet of the telescopic chute structure 711 corresponds to the filling inlet 603 of the reaction tank 6.

[0026] like Figure 11 As shown, the high-frequency vibration table 3 includes a base 301, which is a rectangular structure. Each side wall of the base 301 is provided with a fixing block 302, and a spring 303 is provided on the fixing block 302. The other end of the spring 303 is connected to a support plate 304. Three vibration motors 305 are evenly arranged circumferentially on the support plate 304. The three vibration motors 305 act in the X, Y, and Z directions respectively. The upper end face of the support plate 304 is fixedly connected to the reaction vessel 6.

[0027] like Figure 12 As shown, the microfoam generation module 8 includes a venturi tube 801. The filling inlet 603 of the venturi tube 801 is connected to an external venturi tube 801 via a pipe. The outlet of the honeycomb ceramic membrane fine disperser 802 is connected to a constant pressure buffer tank 803 via a pipe. A variable frequency screw pump 804 is installed at the outlet of the constant pressure buffer tank 803. The variable frequency screw pump 804 inputs microfoam into the microfoam injection header port 609. The PLC controller is connected via wires to the operation of the second motor 608, the third motor 703, the weighing roller 705, the vibrating motor 305, the sector gate 613, the pneumatic slide valve 710, the telescopic chute, and the variable frequency screw pump 804. Example

[0028] Parameter settings: The moisture content of the contaminated soil is set to 22%; the microfoam is prepared by 0.05% saponin + 0.01M citric acid solution; the injection flow rate of the microfoam injection header port 609 at the bottom of the rinsing station is set to 1L / min; the negative pressure at the negative pressure port 604 of the reaction tank is set to -3kPa; the vibration frequency of the ultrasonic vibration generator is set to 40Hz; the ultrasonic power is 400W; and the reaction time is 12 minutes; the main negative pressure at the unloading station is set to -85kPa.

[0029] A microfoam leaching device and method for contaminated soil based on the ATP formation principle includes the following steps: Step 1: The PLC controller performs system startup and initialization preparation for the device, controls the opening of the sealing door 605, and simultaneously controls the extension of the telescopic chute structure 711 to the filling inlet 603 at the top of the reaction tank 6. The contaminated soil enters the quantitative feeder through the hopper 701. The weighing roller 705 weighs the contaminated soil. The weighed contaminated soil is then conveyed to the telescopic chute structure 711 via a belt. The PLC controller sets the weight of the contaminated soil entering the reaction tank 6 at one time. The weighing roller 705 weighs the soil according to the weight set by the PLC controller and feeds the data back to the PLC controller. When the weight of the contaminated soil reaches the target, the PLC controller controls the No. 3 motor 703 and the pneumatic slide valve 710 to close the No. 3 motor 703 and the pneumatic slide valve 710. The telescopic chute structure 711 retracts, and the filling station operation ends. Step Two: The PLC controller positions the turntable and aligns it with the workstation. By controlling motor 4 to drive gear 5 to rotate 120°, the high-frequency vibration table 3 moves to the rinsing station of the large crossed roller bearing 2. The PLC controller controls the formation and supply of microfoam. The microfoam injection main pipe interface 609 is quickly connected to the pipe of the foam injection component. The foam is pumped into the main pipe 607 by the variable frequency screw pump 804, and then enters the inner layer 602 and cavity 606 of the reaction tank 6 through the foam holes 611 on the main pipe 607 and auxiliary pipe 610, rinsing the contaminated soil. Simultaneously, the negative pressure interface 6... 04 Connect an external Roots vacuum pump unit and a gas-liquid separation tank to maintain a slight positive pressure inside the reaction tank 6 while applying a slight negative pressure in the top area of ​​the tank and between the outer shell 601 and the inner layer 602. This pressure gradient forms a driving force, guiding the micro foam to flow naturally upward and to the outer negative pressure area after being injected from different positions of the main pipe 607. It carries the pollutants desorbed from the soil to the bottom of the inner layer 602 and the bottom of the cavity 606. At the same time, during the rinsing process, the PLC controller controls the ultrasonic vibration generator 10 to perform ultrasonic reaction and vibration on the reaction tank 6 to achieve full contact between the gas, liquid and solid phases. Step 3: After thorough rinsing, the PLC controller controls the ultrasonic vibration generator 10 to stop working. The cleaned microfoam mixture passes through the negative pressure filtration port 612 at the bottom of the housing 601. The negative pressure filtration port 612 purifies the microfoam mixture externally through a pipe. The purified microfoam re-enters the Venturi tube 801 for reuse. The connection of the negative pressure port 604 is then disconnected. Step 4: After the rinsing and repair are completed, the PLC controller controls the No. 1 motor 4 to drive the gear 5, causing the high-frequency vibration table 3 to move to the unloading position of the large crossed roller bearing 2. Through the negative pressure filtration interface 612, another external pipeline is connected to reverse-flow low-pressure hot nitrogen or dry air into the cavity 606. The gas enters through the micropores of the inner layer 602, separating the mixture in the reaction tank 6 into solid and liquid phases. This causes the contaminants in the tank to accumulate on the surface of the inner layer 602, forming a filter cake. The filter cake is then backflushed and gently dried to reduce its adhesion and induce micro-cracks. To facilitate subsequent peeling, the PLC controller then controls the second motor 608 to start working. The second motor 608 drives the main pipe 607 to rotate, thereby driving the auxiliary pipe 610 and the flexible scraper 614 to work. The filter cake on the inner wall of the inner layer 602 is cleaned by the flexible scraper 614. At the same time, the PLC controller controls the ultrasonic vibration generator 10 to perform ultrasonic reaction and vibration on the reaction tank 6, so that the filter cake peels off from the liner in the form of sheets or blocks to the bottom of the inner layer 602. The PLC controller then closes the negative pressure suction port 612. Step 5: The PLC controller controls the opening of the sector gate 613, turns off the drive of the second motor 608, and simultaneously turns on the vibration table to vibrate. The sheet filter cake falls from the reaction tank 6 to the leak-proof collection bucket 9 below. After completing one cycle, the PLC controller controls the vibration table to stop vibrating and controls the drive gear 5 of the first motor 4 to move the high-frequency vibration table 3 to the packing position of the large crossed roller bearing 2 for repeated operation.

[0030] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A microfoam leaching device for contaminated soil based on the ATP formation principle, characterized in that: The system includes a support platform (1), on which a large crossed roller bearing (2) is fixedly mounted. Three high-frequency vibration tables (3) are mounted on the large crossed roller bearing (2). A first motor (4) is mounted at the lower end of each high-frequency vibration table (3). The output shaft of the first motor (4) is fixedly connected to the main shaft of a gear (5). The gear (5) meshes with the inner raceway of the large crossed roller bearing (2). The first motor (4) drives the inner ring of the large crossed roller bearing (2) to rotate. The three high-frequency vibration tables (3) are evenly distributed on the large crossed roller bearing (2). Each of the three high-frequency vibration tables (3) is equipped with a reaction tank (6). The three reaction tanks (6) are arranged clockwise as a filling station, a rinsing station, and a discharging station. The filling station is equipped with a feeding component (7). The rinsing station is equipped with a micro foam generating module (8) on one side. The micro foam generating module (8) is set on a support platform (1). The discharging station is equipped with a leak-proof collection tank (9). The system also includes a PLC controller. The PLC controller controls the No. 1 motor (4) to work. When the designated station is reached, the No. 1 motor (4) stops driving and locks the station. The reaction vessel (6) includes an outer shell (601), and an inner layer (602) is provided inside the outer shell (601). The upper and lower ends of the outer shell (601) and the inner layer (602) are respectively fixed and sealed. The upper end of the outer shell (601) is provided with a filling inlet (603) and a negative pressure port (604). The filling inlet (603) is connected to the inner layer (602). The filling inlet (603) is provided with a sealing door (605). The negative pressure port (604) is connected to the inner layer (602). 4) A cavity (606) connecting the outer shell (601) and the inner layer (602) is provided with a main tube (607) at the center of the inner layer (602). The upper end of the main tube (607) passes through the inner layer (602) and connects to the upper end face of the outer shell (601) to a second motor (608). The lower end of the main tube (607) passes through the inner layer (602) and connects to the lower end face of the outer shell (601) to a microfoam injection header interface (609). The main tube (607) is uniformly provided with There are three sets of auxiliary tubes (610), each set of which has six auxiliary tubes (610). The six auxiliary tubes (610) are evenly distributed circumferentially on the main tube (607). Both the main tube (607) and the auxiliary tubes (610) are provided with foam holes (611). The microfoam enters the reaction vessel (6) through the foam holes (611). A negative pressure suction port (612) is provided at the lower edge of the outer shell (601). The negative pressure suction port (612) is connected to an air... The foam outlet of the cavity (606) is connected to the micro foam generation module (8) after purification and regeneration through a pipeline. The lower end of the inner layer (602) is provided with a discharge outlet. A fan-shaped gate (613) is provided at the discharge outlet. The fan-shaped gate (613) corresponds to the leak-proof collection bucket (9). Multiple micropores are opened on the side wall of the inner layer (602). The pore diameter of the micropores is set to 10-50μm. The pore diameter of the micropores is smaller than the diameter of sand particles in the soil.

2. The soil microfoam leaching device based on the ATP formation principle according to claim 1, characterized in that: A flexible scraper (614) is fixedly installed at the end of the auxiliary tube (610), and the flexible scraper (614) is in contact with the inner layer (602) wall.

3. The soil microfoam leaching device based on the ATP formation principle according to claim 2, characterized in that: The feeding component (7) includes a feeding hopper (701), and a quantitative feeder is fixedly installed at the lower end of the feeding hopper (701). The quantitative feeder includes a housing (702), and the feeding hopper (701) is fixedly connected to the feed inlet of the housing (702). A No. 3 motor (703) is installed on one side wall of the housing (702). The output end of the No. 3 motor (703) is connected to the front roller (704). A weighing roller (705), a flat roller (706), and a rear roller (707) are sequentially arranged on the feeding side of the front roller (704). The front roller (704) and the rear roller (707) are driven by a belt. The front roller (704), the weighing roller (705), the flat roller (706) and the rear roller (707) are all mounted on the frame (708). The end of the belt is provided with a feeding outlet (709). The feeding outlet (709) is provided with a pneumatic slide valve (710). The lower end of the pneumatic slide valve (710) is provided with a telescopic chute structure (711). The outlet of the telescopic chute structure (711) corresponds to the filling inlet (603) of the reaction tank (6).

4. The soil microfoam leaching device based on the ATP formation principle according to claim 3, characterized in that: The high-frequency vibration table (3) includes a base (301), which is a rectangular structure. Each side wall of the base (301) is provided with a fixing block (302). A spring (303) is provided on the fixing block (302). The other end of the spring (303) is connected to a support plate (304). Three vibration motors (305) are evenly arranged circumferentially on the support plate (304). The three vibration motors (305) act in the X, Y and Z directions respectively. The upper end face of the support plate (304) is fixedly connected to the reaction vessel (6).

5. A microfoam leaching device for contaminated soil based on the ATP formation principle according to claim 4, characterized in that: The microfoam generation module (8) includes a venturi tube (801). The filling inlet (603) of the venturi tube (801) is connected to an external venturi tube (801) which is connected to a honeycomb ceramic membrane fine disperser (802) via a pipe. The outlet of the honeycomb ceramic membrane fine disperser (802) is connected to a constant pressure buffer tank (803) via a pipe. A variable frequency screw pump (804) is installed at the outlet of the constant pressure buffer tank (803). The variable frequency screw pump (804) inputs the microfoam into the microfoam injection header interface (609).

6. The contaminated soil microfoam leaching device based on the ATP formation principle according to claim 5, characterized in that: The PLC controller is connected via wires to motor No. 2 (608), motor No. 3 (703), weighing roller (705), vibrating motor (305), sector gate (613), pneumatic slide valve (710), telescopic chute and variable frequency screw pump (804).

7. A microfoam leaching device for contaminated soil based on the ATP formation principle according to claim 6, characterized in that: Multiple ultrasonic vibration generators (10) are provided on the lower side wall of the housing (601), and the ultrasonic vibration generators (10) are connected to the PLC controller.

8. A method of using a microfoam leaching device for contaminated soil based on the ATP formation principle as described in claim 7, characterized in that, Includes the following steps: Step 1: The PLC controller controls the sealing door (605) to open, and at the same time controls the telescopic chute structure (711) to extend to the filling inlet (603) at the top of the reaction tank (6). The contaminated soil enters the quantitative feeder through the hopper (701). The weighing roller (705) weighs the contaminated soil. The weighed contaminated soil is conveyed to the telescopic chute structure (711) by the belt. The PLC controller sets the weight of the contaminated soil entering the reaction tank (6) at one time. The weighing roller (705) weighs according to the weight set by the PLC controller and feeds the data back to the PLC controller. When the weight of the contaminated soil reaches the standard, the PLC controller controls the No. 3 motor (703) and the pneumatic slide valve (710) to close the No. 3 motor (703) and the pneumatic slide valve (710). The telescopic chute structure (711) is retracted, and the filling station work is completed. Step 2: The PLC controller controls the No. 1 motor (4) to drive the gear (5), causing the high-frequency vibration table (3) to move to the rinsing station of the large crossed roller bearing (2). The micro foam injection main pipe interface (609) is quickly connected to the pipe of the foam injection component. The micro foam is pumped into the main pipe (607) by the variable frequency screw pump (804), and enters the inner layer (602) and cavity (606) of the reaction tank (6) through the foam holes (611) on the main pipe (607) and auxiliary pipe (610) to rinse the contaminated soil. At the same time, the negative pressure interface (604) is connected to the external Roots vacuum pump group. A gas-liquid separator is used to maintain a slight positive pressure inside the reaction tank (6) while applying a slight negative pressure between the top area of ​​the tank and the outer shell (601) and the inner layer (602). This pressure gradient forms a driving force, which guides the micro foam to flow naturally upward and outward to the negative pressure area after being injected from different positions of the main pipe (607). It carries the pollutants desorbed from the soil to the bottom of the inner layer (602) and the cavity (606) to collect. At the same time, during the rinsing process, the PLC controller controls the ultrasonic vibration generator (10) to perform ultrasonic reaction and vibration on the reaction tank (6) to achieve full contact of the gas, liquid and solid phases. Step 3: After thorough rinsing, the PLC controller controls the ultrasonic vibration generator (10) to stop working. The cleaned microfoam mixture passes through the negative pressure suction port (612) at the bottom of the housing (601). The negative pressure suction port (612) purifies the microfoam mixture externally through the pipeline. The purified microfoam re-enters the Venturi tube (801) for reuse. The connection of the negative pressure port (604) is then disconnected. Step 4: The PLC controller drives the gear (5) via motor (4) to move the high-frequency vibration table (3) to the unloading position of the large crossed roller bearing (2). It connects to another external pipeline via the negative pressure filtration port (612) to reverse-flow low-pressure hot nitrogen or dry air into the cavity (606). The gas enters through the micropores of the inner layer (602), separating the mixture in the reaction tank (6) into solid and liquid phases. This causes the contaminants in the tank to accumulate on the surface of the inner layer (602), forming a filter cake. The filter cake is then backflushed and gently dried to reduce its adhesion and create microcracks, facilitating subsequent peeling. Subsequently, the PLC controller controls the second motor (608) to start working. The second motor (608) drives the main pipe (607) to rotate, thereby driving the auxiliary pipe (610) and the flexible scraper (614) to work, so that the filter cake on the inner wall of the inner layer (602) is cleaned by the flexible scraper (614). At the same time, the PLC controller controls the ultrasonic vibration generator (10) to perform ultrasonic reaction and vibration on the reaction tank (6), so that the filter cake peels off from the liner in the form of sheets or blocks and falls to the bottom of the inner layer (602). The PLC controller closes the negative pressure suction port (612). Step 5: The PLC controller controls the opening of the fan-shaped gate (613), turns off the drive of the second motor (608), and simultaneously turns on the vibration table to vibrate. The sheet filter cake falls from the reaction tank (6) to the leak-proof collection bucket (9) below. After completing one operation, the PLC controller controls the vibration table to stop vibrating and controls the drive gear (5) of the first motor (4) to move the high-frequency vibration table (3) to the packing position of the large cross roller bearing (2) for repeated operation.

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