A multi-phase extraction and tail gas wastewater treatment integrated device and a control method thereof

Abstract

The application discloses a kind of multiphase extraction and tail gas wastewater treatment integration device and its control method, including at least one set of small multiphase extraction unit connected with extraction well, the reagent tank that is stored with solubilizing agent and oxidizing agent, resin adsorption tower, oil-water separator, photocatalytic reactor, oil storage tank, heating system for heating reagent tank and oil-water separator and provide high-temperature steam for resin adsorption tower and controller, wherein reagent tank is connected with extraction well and photocatalytic reactor respectively, the multiphase extraction unit includes gas-liquid separator, water ring vacuum pump and jet pump, wherein the gas-liquid mixture extracted is carried out gas-liquid separation by gas-liquid separator, waste gas is transported to resin adsorption tower by water ring vacuum pump, waste liquid and the oil-water mixture extracted are transported to oil-water separator by jet pump respectively, waste water is transported to photocatalytic reactor, and waste oil is transported to oil storage tank.The application effectively guarantees the stability and high efficiency of removal efficiency while realizing miniaturization.

Description

Technical Field

[0001] This invention belongs to the technical field of soil remediation, and particularly relates to an integrated device for multiphase extraction and tail gas and wastewater treatment and its control method. Background Technology

[0002] Multiphase extraction (MEP) technology is an advanced technology for the remediation of contaminated soil and groundwater, primarily targeting volatile and semi-volatile organic pollutants. MEP can simultaneously treat contaminated soil and groundwater, and is suitable for contaminated sites containing non-aqueous phase liquids (NAPLs), such as petrochemical plants and gas stations. However, in areas with high concentrations of NAPLs at sites of sudden pollution incidents, conventional MEP equipment is generally large, ranging from 5 to 20 cubic meters and occupying 10 to 30 square meters of land. The remediation process suffers from high uncertainty, poor site compatibility, and removal efficiency fluctuating between 50% and 90% due to variations in pollutants and soil composition. The operation cycle is long, typically 2 to 6 months, and the tailing effect is severe, with pollutant concentrations decreasing slowly in the later stages of remediation, reducing by only 5% to 10%, further extending the remediation time and failing to meet the emergency remediation needs of sites contaminated by sudden incidents. Furthermore, the remediation process generates large amounts of waste gas and wastewater, which cannot be treated co-processed and require separate exhaust gas and wastewater treatment equipment or off-site disposal.

[0003] Therefore, it is urgent to solve the above problems. Summary of the Invention

[0004] Purpose of the invention: The first purpose of this invention is to provide an integrated device for multiphase extraction and tail gas wastewater treatment, which achieves miniaturization while effectively ensuring the stability and high efficiency of removal efficiency.

[0005] The second objective of this invention is to provide a control method for an integrated device for multiphase extraction and tail gas / wastewater treatment.

[0006] Technical Solution: To achieve the above objectives, this invention discloses an integrated device for multiphase extraction and tail gas / wastewater treatment, comprising at least one small multiphase extraction unit connected to an extraction well, a reagent tank storing solubilizing and oxidizing agents, a resin adsorption tower for treating waste gas, an oil-water separator for treating waste liquid, a photocatalytic reactor for treating wastewater, an oil storage tank for storing waste oil, a heating system for heating the reagent tank and oil-water separator, and a heating system and controller for providing high-temperature steam to the resin adsorption tower. The reagent tank is connected to both the extraction well and the photocatalytic reactor. The multiphase extraction unit includes a gas-liquid separator, a water ring vacuum pump, and a jet pump. The extracted gas-liquid mixture undergoes gas-liquid separation via the gas-liquid separator. The waste gas is transported to the resin adsorption tower via the water ring vacuum pump. The waste liquid and the extracted oil-water mixture are transported to the oil-water separator via the jet pump, the wastewater is transported to the photocatalytic reactor, and the waste oil is transported to the oil storage tank.

[0007] Optionally, an electric ball valve and a buffer tank are connected in sequence between the gas-liquid separator and the jet pump.

[0008] Optionally, a flow sensor for monitoring the extraction rate can be installed on the gas-liquid separator piping.

[0009] Optionally, a metering pump for regulating the amount of oxidizing agent is installed on the pipeline between the reagent tank and the photocatalytic reactor.

[0010] Optionally, a small gas-liquid separator for separating the water used in the operation of the water ring vacuum pump is connected to the water ring vacuum pump.

[0011] Optionally, there are at least two resin adsorption towers, and the photocatalytic reactor is connected to one of the resin adsorption towers. The qualified wastewater treated by the photocatalytic reactor is then transported to the resin adsorption tower for further treatment.

[0012] Optionally, the mobile vehicle body with a generator set is also included, and the multiphase extraction unit, reagent tank, resin adsorption tower, oil-water separator, photocatalytic reactor, oil storage tank, heating system and controller are all placed on the mobile vehicle body.

[0013] Optionally, both the oil-water separator and the reagent tank are equipped with heating plates connected to a heating system, which is connected to the qualified wastewater discharge pipeline and the gas pipeline of the resin adsorption tower.

[0014] Based on the same inventive concept, this invention discloses a control method for an integrated device for multiphase extraction and tail gas / wastewater treatment, comprising the following steps:

[0015] After the reagent tank injects the solubilizing agent into the extraction well, the generator set starts, and the controller controls the water ring vacuum pump and jet pump to generate negative pressure for extraction. The multiphase extraction unit performs multiphase extraction of volatile and semi-volatile organic pollutants in the pores of the underground soil. The flow sensor provides real-time feedback on the extraction flow rate. If the flow rate > V max Gradually close the electric ball valve to reduce the flow rate. If the flow rate is < V min The heating system heats the solubilizing agent in the reagent tank and injects the heated solubilizing agent into the extraction well until the extraction flow rate is maintained at V. min ~V max ;

[0016] The extracted gas-liquid mixture is sent to a gas-liquid separator for separation. The separated waste gas is then sent to a resin adsorption tower for treatment. If the ratio of the outlet concentration to the inlet concentration of the resin adsorption tower is less than the proportional threshold, clean tail gas is output. If the ratio is greater than the proportional threshold, it indicates that the adsorbent in the resin adsorption tower has permeated. The heating system is then activated to heat the qualified wastewater to generate high-temperature steam, which is then introduced into the resin adsorption tower for thermal regeneration of the adsorbent. If the ratio is greater than or equal to the maximum proportional threshold, it indicates that the adsorbent in the resin adsorption tower is saturated. In this case, the gas intake of the resin adsorption tower must be stopped, and heating regeneration must be performed. After several heating cycles, the adsorbent must be replaced.

[0017] The waste liquid separated by the gas-liquid separator is sent to the oil-water separator via a buffer tank. If the viscosity of the oil-water mixture is greater than the viscosity threshold, the heating system is activated to heat the oil-water separator and reduce the viscosity. The separated waste oil is collected in an oil storage tank for storage. The separated wastewater is sent to the photocatalytic reactor for treatment by a transfer pump. Simultaneously, the reagent tank delivers oxidizing agents to the photocatalytic reactor to enhance the decomposition of pollutants. The treated wastewater meets the secondary discharge standard. Some of the qualified wastewater is transported through pipelines to the resin adsorption tower for treatment to achieve a higher level of discharge standard. The wastewater that meets the higher level of discharge standard is then transported back to the inlet of the water ring vacuum pump for recycling through an external storage tank. The remaining qualified wastewater can be directly discharged or stored.

[0018] Beneficial Effects: Compared with existing technologies, this invention has the following significant advantages: Upon reaching the site of a sudden pollution incident, this invention injects a solubilizing agent into the contaminated stratum. Simultaneously, a water-ring vacuum pump applies vacuum to the extraction well to extract the gas-liquid mixture to a gas-liquid separator for gas-liquid separation. A jet pump extracts an oil-water mixture to an oil-water separator for oil-water separation. The separated gas is sent to a resin adsorption tower for purification. Waste oil is collected and stored, and wastewater is sent to a photocatalytic reactor. The purified wastewater can be recycled by various equipment. The entire device of this invention can be miniaturized and mobile, allowing for flexible site access. The remediation process achieves efficient in-situ treatment of pollutants without generating waste gas or wastewater. By setting a buffer tank at the outlet of the gas-liquid separator, the negative pressure between the gas-liquid separator and the tank can be adjusted to allow water accumulated at the bottom of the separator, which is difficult to extract directly, to be buffered. The water tank is pumped to the oil-water separator to improve extraction efficiency. Simultaneously, water in the buffer tank can be pumped back to the separator for self-cleaning. This invention purifies waste gas and wastewater separately through a resin adsorption tower and a photocatalytic reactor. For wastewater requiring deeper treatment, the pipeline can be switched back into the resin adsorption tower for further treatment, achieving multi-stage wastewater purification through resin adsorption coupled with photocatalysis. This invention utilizes a heated solubilizing agent in the reagent tank for highly efficient solubilization, exhibiting strong adaptability to pollutants and soil conditions, with a stable removal rate exceeding 90%. The heated adsorbent, oxidizing agent, and high-temperature steam introduced into the pre-reserved regeneration steam port of the resin adsorption tower achieve in-situ regeneration of the resin. This allows the invention to maintain high efficiency under low pollution concentrations while maintaining a small size, with a stable repair rate throughout the process and reduced tailing phenomena. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the present invention;

[0021] Figure 3 This is a top view of the present invention;

[0022] Figure 4 This is a schematic diagram of the multiphase extraction unit in this invention;

[0023] Figure 5 This is a schematic diagram of the resin adsorption tower in this invention;

[0024] Figure 6 This is a schematic cross-sectional view of the resin adsorption tower in this invention;

[0025] Figure 7 This is a flowchart of the control method in this invention. Detailed Implementation

[0026] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, this invention discloses an integrated device for multiphase extraction and tail gas wastewater treatment, comprising a mobile vehicle body 1, a multiphase extraction unit 2, a metering pump 3, an oil-water separator 4, a photocatalytic reactor 5, a resin adsorption tower 6, an oil storage tank 7, a reagent tank 8, a generator set 9, a controller 10, a heating system 11, and a transfer pump 12. The multiphase extraction unit 2, metering pump 3, oil-water separator 4, photocatalytic reactor 5, resin adsorption tower 6, oil storage tank 7, reagent tank 8, generator set 9, controller 10, heating system 11, and transfer pump 12 are all integrated into the mobile vehicle body 1. The multiphase extraction unit, oil-water separator, photocatalytic reactor, resin adsorption tower, oil storage tank, generator set, and controller are all modularly designed, with pulleys and rails at the bottom for quick disassembly and easy maintenance and replacement according to actual on-site needs. The reagent tank 8 stores solubilizing and oxidizing agents. The resin adsorption tower 6 is used to treat waste gas, the oil-water separator 4 is used to treat waste liquid, the photocatalytic reactor 5 is used to treat wastewater, and the oil storage tank 7 is used to store waste oil. The heating system 11 is used to heat the reagent tank and the oil-water separator, as well as to provide high-temperature steam to the resin adsorption tower. The solubilizing agent in the reagent tank 8 is connected to the extraction well through a dosing pipe, and the oxidizing agent in the reagent tank 8 is connected to the photocatalytic reactor 5 through a dosing pipe. The extracted gas-liquid mixture is separated by the gas-liquid separator 201. The separated gas is transported to the resin adsorption tower 6 by the water ring vacuum pump 202. The separated waste liquid and the extracted oil-water mixture are transported to the oil-water separator 4 by the jet pump 208, respectively. The separated wastewater is transported to the photocatalytic reactor 5, and the separated waste oil is transported to the oil storage tank 7.

[0028] like Figure 1 and Figure 4As shown, the multiphase extraction unit 2 is connected to the extraction well. The multiphase extraction unit 2 is a small extraction unit; at least one set of multiphase extraction unit 2 is required, and two sets can be installed concurrently. The volume of the multiphase extraction unit 2 is 1 to 3 cubic meters, occupying an area of ​​2 to 5 square meters, making it more suitable for confined spaces and mobile operation. The multiphase extraction unit 2 includes a gas-liquid separator 201, a water ring vacuum pump 202, a buffer tank 203, an electric ball valve 204, a small gas-liquid separator 205, a flow sensor 206, a filter 207, and a jet pump 208. An electric ball valve 204, a buffer tank 203, a jet pump 208, and a flow sensor 206 are sequentially connected between the gas-liquid separator 201 and the oil-water separator. A water ring vacuum pump 202, a small gas-liquid separator 205, and a flow sensor 206 are sequentially connected between the gas-liquid separator 201 and the resin adsorption tower. The small gas-liquid separator 205 is also connected to an external water storage tank. A filter 207, a jet pump 208, and an oil-water separator 4 are sequentially connected to the pipeline containing the oil-water mixture. The oil-water mixture is transported to the oil-water separator 4 through the filter 207 and the jet pump 208. The bottom of the gas-liquid separator 201 is connected to the bottom buffer water tank 203 via a pipe. An electric ball valve 204 is installed on the pipe. A water ring vacuum pump 202 is connected to the outlet of the gas-liquid separator 201. The outlet of the water ring vacuum pump 202 is also the exhaust port. A small gas-liquid separator 205 is connected to the outlet of the water ring vacuum pump 202. Flow sensors 206 are arranged on both the gas and liquid pipelines. The flow sensors 206 are also connected to the controller. The flow sensors 206 are used to monitor the extraction speed, monitor and adjust the extraction speed and pressure of the gas-liquid mixture in real time, save energy and improve extraction and separation efficiency.

[0029] When the miniaturized gas-liquid separator cannot directly extract the water accumulated at the bottom of the separator under high negative pressure conditions, the water ring vacuum pump 202 operates, and the electric ball valve 204 closes. When the liquid level inside the gas-liquid separator reaches half, the electric ball valve 204 opens. At this time, the negative pressure inside the buffer water tank 203 and the gas-liquid separator 201 tends to be the same, and the water at the bottom of the gas-liquid separator 201 flows into the buffer water tank 203. When the water level gauge of the gas-liquid separator reaches the low level, the electric ball valve 204 closes. At this time, the internal pressure of the buffer water tank 203 is at atmospheric pressure, and the liquid can be normally delivered to the oil-water separator. The gas-liquid separator 201 is equipped with a hand hole door on the side, which can be used for flushing or draining when the blades are blocked or the bottom is stagnant. The water in the buffer water tank 203 can be pumped back into the gas-liquid separator to realize automatic cleaning of the gas-liquid separator, solve the problem of easy clogging of miniaturized gas-liquid separators, extend equipment life, and improve separation efficiency.

[0030] The water ring vacuum pump 202 is also equipped with a small gas-liquid separator 205 at its outlet. During operation, a water storage tank can be set up in an external location. The treated wastewater that meets the standards is connected to the external water storage tank from the outlet of the photocatalytic reactor 5. The water in the water storage tank is pumped into the inlet of the water ring vacuum pump 202 by a submersible pump. The outlet of the water ring vacuum pump 202 is also the exhaust port. The working water of the water ring vacuum pump 202 is treated by the small gas-liquid separator 205. The small gas-liquid separator 205 sends the separated gas and waste gas together to the resin adsorption tower. The small gas-liquid separator 205 discharges the separated water back into the water storage tank through the drain port, thus forming a cycle. Without the need for an external water source, the water ring vacuum pump can work continuously, improving working efficiency.

[0031] The gas-liquid separator 201 of the multiphase extraction unit 2 sends the separated gas to the resin adsorption tower 6 for purification. The separated liquid, along with the extracted oil-water mixture, is sent to the oil-water separator 4 for further separation. The non-aqueous liquid separated by the oil-water separator 4 is transported to the oil storage tank 7, and the wastewater is sent to the photocatalytic reactor 5 for purification. The reagent tank 8 provides solubilizing agents to the extraction well and oxidizing agents to the photocatalytic reactor 5. The reagent tank 8 stores both solubilizing and oxidizing agents. The solubilizing agents are existing ones, injected into the contaminated formation of the extraction well, and used in conjunction with the multiphase extraction unit to improve extraction efficiency. The oxidizing agents mainly include oxidants and acid solutions for pH adjustment. After separation by the oil-water separator 4, the wastewater enters the pipeline and, according to the ratio, is added to the photocatalytic reactor 5 for purification, improving oxidation efficiency. A metering pump 3 is installed on the pipeline between the reagent tank 8 and the photocatalytic reactor 5, which can regulate the amount of oxidizing agent used. The external fuel tank of generator set 9 is located above the fuel tank of the mobile vehicle, and can work 24 hours a day. The controller 10 can realize data transmission and remote control of all instruments and equipment through PLC.

[0032] like Figure 5 and Figure 6As shown, two resin adsorption towers 6 are connected in parallel, and the photocatalytic reactor 5 is connected to one of them. The resin adsorption tower 6 is equipped with a regeneration steam inlet 601, a regeneration steam outlet 602, a gas outlet 603, a gas inlet 604, a cooling water inlet 605, a water outlet 606, a feeding port 607, a water inlet 608, a manhole 609, a drain port 610, a gas-liquid separation layer 611, a resin adsorption layer 612, a regeneration steam pipeline 613, and a gas-liquid distributor 614. During operation, the waste gas separated by the gas-liquid separator 201 is transported to the resin adsorption tower 6 for purification, and the waste liquid is transported to the photocatalytic reactor 5 for purification. When higher standards of wastewater treatment are required, the pipeline can be switched. After treatment by the photocatalytic reactor 5, the wastewater is then pumped to the water inlet 608 of the resin adsorption tower 6 for further deep treatment. The treated water is then discharged into an external water storage tank through the water outlet 606, solving the problem of low purification efficiency of the miniaturized photocatalytic reactor and meeting the requirements for deep wastewater treatment.

[0033] The resin adsorption tower 6 can simultaneously treat wastewater and waste gas. Compared to ordinary resin adsorption towers, to simultaneously purify wastewater and waste gas, the upper part of the resin adsorption tower is equipped with a gas-liquid separation layer 611, which can output the purified wastewater and waste gas separately. The middle part of the resin adsorption tower has three resin adsorption layers to avoid the problems of traditional resin stacking within the tower body and low adsorption efficiency. The resin adsorption tower also has a regeneration steam pipe 613 that reciprocates through the resin adsorption layers. When the adsorption material is saturated or exhausted, high-temperature steam can be ejected through the jet nozzles on the pipe to perform in-situ thermal regeneration of the resin material. The bottom of the resin adsorption tower is also equipped with a gas-liquid distributor to ensure uniform distribution of waste liquid and waste gas.

[0034] A heating system 11 is also installed on the mobile vehicle body 1, which is arranged on the upper part of the oil-water separator 4, parallel to the reagent tank 8. During operation, the heating system 11 can heat the heating plates on the oil-water separator 4 and the reagent tank 8, thereby increasing the preparation speed of the oxidizing agent and the solubilizing agent. At the same time, the oil-water viscosity is controlled by temperature, solving the problem of low separation efficiency in miniaturized oil-water separation equipment. The heating system 11 heats the qualified wastewater to obtain high-temperature steam, which is connected to the regeneration steam inlet 601 and regeneration steam outlet 602 of the resin adsorption tower 6 to perform in-situ thermal regeneration of the saturated resin. The waste heat can be recycled, solving the problems of low resin loading and low adsorption capacity in miniaturized resin adsorption equipment, and achieving efficient and continuous purification of exhaust gas.

[0035] This invention, implemented in this embodiment, allows for rapid access to the contaminated site via a mobile vehicle 1. A multiphase extraction unit extracts pollutants from the soil and performs gas-liquid and oil-water separation. Waste gas is transported to a resin adsorption tower mounted on the mobile vehicle, waste liquid is transported to an oil-water separator for separation, and wastewater is transported to a photocatalytic reactor mounted on the mobile vehicle. This enables on-site, real-time treatment of waste gas and wastewater without the need for an external water source. All equipment is arranged on both sides of the mobile vehicle, allowing for on-site maintenance or replacement via a central maintenance access point. A generator set is also included for continuous long-term operation. The overall equipment is highly mobile and easy to operate, significantly improving the efficiency of on-site contaminated soil remediation. This invention features high site compatibility and minimal impact of various pollutants and soil conditions on removal efficiency. By treating wastewater and exhaust gas in situ, recycling wastewater, and utilizing a heated solubilizing agent in the reagent tank, it achieves highly efficient solubilization. It exhibits strong adaptability to pollutants and soil conditions, with a stable removal rate exceeding 90%. Furthermore, by utilizing heated adsorbents and oxidizing agents, this invention maintains high efficiency even at low pollution concentrations, ensuring a stable remediation rate throughout the process and reducing tailing phenomena.

[0036] like Figure 7 As shown, the control method of the integrated device for multiphase extraction and tail gas wastewater treatment of the present invention includes the following steps:

[0037] After the reagent tank injects the solubilizing agent into the extraction well, the generator set starts, and the controller controls the water ring vacuum pump and jet pump to generate negative pressure. The multiphase extraction unit performs multiphase extraction of volatile and semi-volatile organic pollutants in the pores of the underground soil. The flow sensor provides real-time feedback on the extraction flow rate. If the flow rate is >2.5m³, the extraction unit will detect the problem. 3 / h, gradually close the electric ball valve to reduce the flow rate. If the flow rate is <1m 3 / h, the heating system heats the solubilizing agent in the reagent tank and injects the heated solubilizing agent into the extraction well until the extraction flow rate is maintained at 1m. 3 / h~2.5m 3 / h;

[0038] The extracted gas-liquid mixture is sent to a gas-liquid separator for separation. The separated waste gas is then sent to a resin adsorption tower for treatment. If the ratio of the outlet concentration to the inlet concentration of the resin adsorption tower is less than 10%, clean tail gas is output. If the ratio is greater than 10%, it indicates that the adsorbent in the resin adsorption tower has permeated. The heating system is then activated to heat the qualified wastewater and generate high-temperature steam, which is then introduced into the resin adsorption tower for thermal regeneration of the adsorbent. If the ratio is ≥80%, it indicates that the adsorbent in the resin adsorption tower is saturated. In this case, the gas intake of the resin adsorption tower must be stopped and regeneration should be performed. After multiple heating cycles, the adsorbent must be replaced.

[0039] The waste liquid separated by the gas-liquid separator is sent to the oil-water separator via a buffer tank. If the viscosity of the oil-water mixture is greater than 120 cP, the heating system is turned on to heat the oil-water separator and reduce the viscosity. The separated waste oil is collected in the oil storage tank for storage. The separated wastewater is sent to the photocatalytic reactor for treatment by a transfer pump. The reagent tank simultaneously sends oxidizing agents to the photocatalytic reactor to enhance the decomposition of pollutants. The treated wastewater meets the secondary discharge standard. Some of the secondary qualified wastewater is transported to the resin adsorption tower through pipelines for treatment to meet the primary discharge standard. The primary qualified wastewater is transported back to the inlet of the water ring vacuum pump for recycling through an external storage tank. The remaining secondary qualified wastewater can be directly discharged or stored.

Claims

1. A control method for an integrated device for multiphase extraction and tail gas / wastewater treatment, characterized in that, The integrated multiphase extraction and tail gas wastewater treatment device includes at least one small multiphase extraction unit (2) connected to the extraction well, a reagent tank (8) storing solubilizing and oxidizing agents, a resin adsorption tower (6) for treating waste gas, an oil-water separator (4) for treating waste liquid, a photocatalytic reactor (5) for treating wastewater, an oil storage tank (7) for storing waste oil, a heating system (11) for heating the reagent tank and oil-water separator and providing high-temperature steam to the resin adsorption tower, and a controller (10). The reagent tank is connected to the extraction well and the photocatalytic reactor (5) respectively. The multiphase extraction unit (2) includes a gas-liquid separator (201), a water ring vacuum pump (202), and a jet pump (203). 8), wherein the extracted gas-liquid mixture is separated by a gas-liquid separator, the waste gas is transported to the resin adsorption tower by a water ring vacuum pump, the waste liquid and the extracted oil-water mixture are respectively transported to the oil-water separator by jet pumps, the waste water is transported to the photocatalytic reactor, and the waste oil is transported to the oil storage tank; the volume of the multiphase extraction unit (2) is 1 to 3 cubic meters, and the floor area is 2 to 5 square meters; the number of the resin adsorption towers (6) is at least 2, the photocatalytic reactor (5) is connected to one of the resin adsorption towers (6), and the qualified wastewater after treatment by the photocatalytic reactor (5) is transported to the resin adsorption tower (6) for treatment; the gas-liquid separator (201) and the jet pump (208) are connected in sequence by an electric current device. A ball valve (204) and a buffer tank (203) are installed; a flow sensor (206) for monitoring the extraction speed is installed on the pipeline of the gas-liquid separator (201); a metering pump (3) for regulating the amount of oxidizing agent is installed on the pipeline between the reagent tank (8) and the photocatalytic reactor (5); a heating plate connected to the heating system (11) is installed on both the oil-water separator (4) and the reagent tank (8), and the heating system (11) is connected to the qualified wastewater discharge pipeline and the gas pipeline of the resin adsorption tower; a filter (207) for filtering oil-water mixture is connected to the inlet of the jet pump (208); a filter for separating the working water ring vacuum pump is connected to the water ring vacuum pump (202). A small gas-liquid separator (205) for water; when the gas-liquid separator (201) cannot directly extract the water at the bottom of the separator by pump pressure under high negative pressure, the water ring vacuum pump (202) works and the electric ball valve (204) is closed. When the liquid level inside the gas-liquid separator (201) reaches half, the electric ball valve (204) is opened. At this time, the negative pressure inside the buffer water tank (203) and the gas-liquid separator (201) tends to be consistent, and the water at the bottom of the gas-liquid separator (201) flows into the buffer water tank (203). When the water level gauge of the gas-liquid separator (201) reaches the low liquid level, the electric ball valve (204) is closed. At this time, the pressure inside the buffer water tank (203) is normal pressure, and the liquid can be normally transported to the oil-water separator;The upper part of the resin adsorption tower (6) is provided with an adsorption tower gas-liquid separation layer (611) to output the purified waste gas and wastewater separately. The middle part of the resin adsorption tower (6) is provided with three layers of resin adsorption. The resin adsorption tower (6) is also provided with a regeneration steam pipeline (613) that passes through the resin adsorption layer from top to bottom. When the adsorption material is saturated or overheated, high-temperature steam is sprayed out through the jet nozzle on the pipeline to perform in-situ thermal regeneration of the resin material. The bottom part of the resin adsorption tower is also provided with a gas-liquid distributor to make the waste liquid and waste gas evenly distributed. The control method includes the following steps: After the reagent tank injects the solubilizing agent into the extraction well, the generator set starts, and the controller controls the water ring vacuum pump and jet pump to generate negative pressure for extraction. The multiphase extraction unit performs multiphase extraction of volatile and semi-volatile organic pollutants in the pores of the underground soil. The flow sensor provides real-time feedback on the extraction flow rate. If the flow rate > V max Gradually close the electric ball valve to reduce the flow rate. If the flow rate is < V min The heating system heats the solubilizing agent in the reagent tank and injects the heated solubilizing agent into the extraction well until the extraction flow rate is maintained at V. min ~V max ; The extracted gas-liquid mixture is sent to a gas-liquid separator for separation. The separated waste gas is then sent to a resin adsorption tower for treatment. If the ratio of the outlet concentration to the inlet concentration of the resin adsorption tower is less than the proportional threshold, clean tail gas is output. If the ratio is greater than the proportional threshold, it indicates that the adsorbent in the resin adsorption tower has permeated. The heating system is then activated to heat the qualified wastewater to generate high-temperature steam, which is then introduced into the resin adsorption tower for thermal regeneration of the adsorbent. If the ratio is greater than or equal to the maximum proportional threshold, it indicates that the adsorbent in the resin adsorption tower is saturated. In this case, the gas intake of the resin adsorption tower must be stopped, and heating regeneration must be performed. After several heating cycles, the adsorbent must be replaced. The waste liquid separated by the gas-liquid separator is sent to the oil-water separator via a buffer tank. If the viscosity of the oil-water mixture is greater than the viscosity threshold, the heating system is activated to heat the oil-water separator and reduce the viscosity. The separated waste oil is collected in an oil storage tank for storage. The separated wastewater is sent to the photocatalytic reactor for treatment by a transfer pump. The heating system is activated to heat the oxidizing agent in the reagent tank. The reagent tank simultaneously sends the oxidizing agent to the photocatalytic reactor to enhance the decomposition of pollutants. The treated wastewater meets a certain discharge standard. Part of the qualified wastewater is transported through pipelines to the resin adsorption tower for treatment to achieve a higher level of discharge standard. The wastewater that meets the higher level of discharge standard is then transported back to the inlet of the water ring vacuum pump for recycling through an external storage tank. The remaining qualified wastewater can be directly discharged or stored.

2. The control method for an integrated device for multiphase extraction and tail gas / wastewater treatment according to claim 1, characterized in that: It also includes a mobile vehicle body (1) with a generator set (9), and the multiphase extraction unit (2), reagent tank (8), resin adsorption tower (6), oil-water separator (4), photocatalytic reactor (5), oil storage tank (7), heating system (11) and controller (10) are all placed on the mobile vehicle body (1).

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