Multiphase extraction and tail gas and wastewater treatment integrated device and control method thereof

Abstract

The invention discloses a multiphase extraction and tail gas and wastewater treatment integrated device and a control method thereof. Comprising at least one set of small multiphase extraction unit connected with an extraction well, an agent box storing a solubilizing agent and an oxidizing agent, a resin adsorption tower, an oil-water separator, a photocatalytic reactor, an oil storage tank, a heating system used for heating the agent box and the oil-water separator and providing high-temperature steam for the resin adsorption tower, and a controller, wherein the medicament box is respectively connected with the extraction well and the photocatalytic reactor, the multiphase extraction unit comprises a gas-liquid separator, a water ring vacuum pump and a jet pump, the extracted gas-liquid mixture is subjected to gas-liquid separation through the gas-liquid separator, waste gas is conveyed to the resin adsorption tower through the water ring vacuum pump, and the resin adsorption tower is used for adsorbing the waste gas. Waste liquid and the extracted oil-water mixture are conveyed to the oil-water separator through the jet pump, waste water is conveyed to the photocatalytic reactor, and waste oil is conveyed to the oil storage tank. According to the invention, miniaturization is realized, and meanwhile, the stability and high efficiency of removal efficiency are effectively guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil remediation, and in particular relates to a multiphase extraction and tail gas wastewater treatment integrated device and a control method thereof. Background Art

[0002] Multiphase extraction technology is an advanced technology for soil and groundwater pollution remediation, mainly targeting volatile and semi-volatile organic pollutants. Multiphase extraction technology can treat contaminated soil and groundwater at the same time, and is suitable for contaminated sites containing non-aqueous phase liquids (NAPLs), such as petrochemical, gas stations and other contaminated sites. In the high-concentration contaminated areas containing non-aqueous phases in the site of sudden pollution accidents, the current conventional multiphase extraction equipment is generally large in size. The volume of conventional multiphase extraction equipment is 5 to 20 cubic meters, and the floor area is 10 to 30 square meters. The remediation process is highly uncertain, the site compatibility is poor, and the removal efficiency is affected by various pollutants and soil, fluctuating between 50% and 90%; the operation cycle is long, generally 2 to 6 months; the tailing phenomenon is serious, and the pollutant concentration in the later stage of remediation decreases slowly, only 5% to 10%, which prolongs the remediation time and is difficult to meet the emergency remediation needs of sudden accident contaminated sites. At the same time, a large amount of waste gas and wastewater will be generated during the remediation process, which cannot be coordinated and needs to be equipped with separate tail gas and wastewater treatment equipment or ex situ disposal.

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

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

[0005] The second object of the present invention is to provide a control method for an integrated device for multi-phase extraction and tail gas and wastewater treatment.

[0006] Technical solution: To achieve the above objectives, the present 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 box storing a solubilizing agent and an oxidizing agent, a resin adsorption tower for treating waste gas, an oil-water separator for treating waste liquid, a photocatalytic reactor for treating waste water, an oil storage tank for storing waste oil, a heating system and a controller for heating the reagent box and the oil-water separator and providing high-temperature steam for the resin adsorption tower, wherein the reagent box is respectively connected to the extraction well and the photocatalytic reactor, and the multiphase extraction unit comprises a gas-liquid separator, a water ring vacuum pump and a jet pump, wherein the extracted gas-liquid mixture is separated by the gas-liquid separator, the waste gas is transported to the resin adsorption tower by the water ring vacuum pump, the waste liquid and the extracted oil-water mixture are respectively transported to the oil-water separator via the jet pump, the waste water 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 water tank are connected in sequence between the gas-liquid separator and the jet pump.

[0008] Optionally, a flow sensor for monitoring the extraction speed is provided on the pipeline of the gas-liquid separator.

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

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

[0011] Optionally, the number of resin adsorption towers is at least 2, the photocatalytic reactor is connected to one of the resin adsorption towers, and the qualified wastewater treated by the photocatalytic reactor is transported to the resin adsorption tower for treatment.

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

[0013] Optionally, the oil-water separator and the reagent box are both provided with heating plates connected to a heating system, and the heating system is connected to a wastewater discharge pipeline that meets the standards and a gas path of the resin adsorption tower.

[0014] Based on the same inventive concept, the present 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 box injects the solubilizing agent into the extraction well, the generator set starts, and the controller controls the water ring vacuum pump and the jet pump to extract and generate negative pressure. The multiphase extraction unit extracts the volatile and semi-volatile organic pollutants in the pores of the underground soil in multiphase. The flow sensor feeds back the extraction flow in real time. If the flow>V max , gradually close the electric ball valve to reduce the flow rate. If the flow rate is less than V min The heating system heats the solubilizing agent in the agent box 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 the gas-liquid separator for gas-liquid separation, and the separated waste gas is sent to the 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 ratio threshold, the clean tail gas is output. If the ratio of the outlet concentration to the inlet concentration of the resin adsorption tower is greater than the ratio threshold, it means that the adsorbent in the resin adsorption tower has penetrated, and the heating system is started to heat the qualified wastewater to generate high-temperature steam, and the high-temperature steam is passed into the resin adsorption tower to regenerate the adsorbent by the high-temperature steam; if the ratio of the outlet concentration to the inlet concentration of the resin adsorption tower is greater than or equal to the maximum ratio threshold, it means that the adsorbent in the resin adsorption tower is saturated, and the resin adsorption tower needs to be stopped from taking in air and heated for regeneration. The adsorbent is replaced after multiple heating cycles;

[0017] The waste liquid after separation by the gas-liquid separator is sent to the oil-water separator for separation through the buffer water tank. If the viscosity of the oil-water mixture is greater than the viscosity threshold, the heating system is turned on to heat the oil-water separator to reduce the viscosity. The separated waste oil is collected in the oil storage tank for storage, and the separated wastewater is sent to the photocatalytic reactor for treatment by the delivery pump. The agent box simultaneously delivers the oxidizing agent to the photocatalytic reactor to enhance the decomposition of pollutants. The treated wastewater meets the secondary emission standard; part of the wastewater that meets the standard is transported to the resin adsorption tower through a pipeline for treatment so that the wastewater meets a higher level of emission standards. The wastewater that meets the higher level of emission standards is transported to the water inlet of the water ring vacuum pump through an external water storage tank for recycling, and the rest of the wastewater that meets the standard can be directly discharged or stored.

[0018] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages: when the present invention reaches the site of a sudden pollution accident, a solubilizing agent is injected into the contaminated stratum, and a vacuum is applied to the extraction well by a water ring vacuum pump to extract the gas-liquid mixture to the gas-liquid separator for gas-liquid separation, and an oil-water mixture is extracted to the oil-water separator by a jet pump for oil-water separation, and the separated gas is sent to a resin adsorption tower for purification, the waste oil is collected and stored, and the waste water is sent to a photocatalytic reactor, and the purified waste water can be recycled for various equipment; the whole set of the present invention can be miniaturized and movable, and can be flexibly brought into the site, and the pollutants can be efficiently disposed of in situ during the repair process without generating waste gas and waste water; the present invention arranges a buffer water tank at the outlet of the gas-liquid separator, and the water accumulated at the bottom of the separator that is difficult to directly extract can be pumped out by the buffer water tank by adjusting the negative pressure in the gas-liquid separator and the water tank The water tank is pumped to the oil-water separator to improve the extraction efficiency. At the same time, the water in the buffer water tank can be pumped back to the separator through the pump to realize the self-cleaning function. The present invention purifies the waste gas and wastewater respectively through the resin adsorption tower and the photocatalytic reactor. At the same time, for the wastewater that needs deep treatment, it can be switched through the pipeline and then introduced into the resin adsorption tower for further treatment, so as to realize the multi-stage wastewater purification of resin adsorption coupled with photocatalysis. The present invention utilizes the solubilizing agent in the heating agent box to couple with efficient solubilization, has strong adaptability to pollutants and soil, and has a stable removal rate of more than 90%. Then, the heated adsorbent, oxidizing agent and the heated high-temperature steam are introduced into the regeneration steam port reserved for the resin adsorption tower to realize the in-situ regeneration of the resin, so that the present invention can maintain efficient operation at low pollution concentration under the premise of miniaturization, and the repair rate of the whole process is stable, reducing the tailing phenomenon. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the principle diagram of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the present invention;

[0021] Figure 3 A top view of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the multiphase extraction unit in the present invention;

[0023] Figure 5 It is a structural schematic diagram of the resin adsorption tower in the present invention;

[0024] Figure 6 It is a cross-sectional schematic diagram of the resin adsorption tower in the present invention;

[0025] Figure 7 It is a flow chart of the control method in the present invention. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0027] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention discloses an integrated device for multiphase extraction and tail gas wastewater treatment, comprising a mobile 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 medicine box 8, a generator set 9, a controller 10, a heating system 11 and a delivery pump 12, wherein the multiphase extraction unit 2, the metering pump 3, the oil-water separator 4, the photocatalytic reactor 5, the resin adsorption tower 6, the oil storage tank 7, the medicine box 8, the generator set 9, the controller 10, the heating system 11 and the delivery pump 12 are all integrated in the mobile body 1. The multiphase extraction unit, the oil-water separator, the photocatalytic reactor, the resin adsorption tower, the oil storage tank, the generator set and the controller are all modularly designed, with pulleys and tracks at the bottom, which can be quickly pulled out and disassembled, so as to facilitate rapid maintenance and replacement according to actual needs on site. The reagent box 8 stores a solubilizing agent and an oxidizing agent, 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, the oil storage tank 7 is used to store waste oil, and the heating system 11 is used to heat the reagent box and the oil-water separator and provide high-temperature steam for the resin adsorption tower, wherein the solubilizing agent in the reagent box 8 is connected to the extraction well through a dosing pipe, and the oxidizing agent in the reagent box 8 is connected to the photocatalytic reactor 5 through a dosing pipe, wherein the extracted gas-liquid mixture is separated by gas-liquid separation through the gas-liquid separator 201, and the separated gas is transported to the resin adsorption tower 6 through the water ring vacuum pump 202, and the separated waste liquid and the extracted oil-water mixture are transported to the oil-water separator 4 via the jet pump 208 respectively, the separated waste water 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. There is at least one multiphase extraction unit 2, and two multiphase extraction units 2 can be provided in parallel. The volume of the multiphase extraction unit 2 is 1 to 3 cubic meters, and the floor area is 2 to 5 square meters, which is more suitable for small sites and mobile operations. The multiphase extraction unit 2 includes a gas-liquid separator 201, a water ring vacuum pump 202, a buffer water 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 water 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, and 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, wherein 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 of the oil-water mixture, wherein 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 buffer water tank 203 at the bottom through a pipeline, and an electric ball valve 204 is provided on the pipeline. The outlet of the gas-liquid separator 201 is connected to a water ring vacuum pump 202, and the water outlet of the water ring vacuum pump 202 is the exhaust port. The water outlet of the water ring vacuum pump 202 is connected to a small gas-liquid separator 205. Flow sensors 206 are arranged on the gas-liquid pipelines, and 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 consumption and improve the extraction and separation efficiency.

[0029] When the miniaturized gas-liquid separator cannot directly pump out the water at the bottom of the separator by pumping 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 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 tend 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 of the liquid level gauge of the gas-liquid separator reaches the low liquid level, the electric ball valve 204 is closed. At this time, the internal pressure of the buffer water tank 203 is normal pressure, and the liquid can be normally transported to the oil-water separator. A hand hole door is provided at the side end of the gas-liquid separator 201, which can be used for flushing or drainage when the blades are blocked or the bottom is silted. The water in the buffer water tank 203 can be pumped back to the gas-liquid separator by the pump to achieve automatic cleaning of the gas-liquid separator, solve the problem of easy blockage of the miniaturized gas-liquid separator, extend the life of the equipment, and improve the separation efficiency.

[0030] A small gas-liquid separator 205 is also provided at the water outlet of the water ring vacuum pump 202. When working, a water tank can be set up in an external site, and the treated wastewater that meets the standards is connected to the external water tank from the water outlet of the photocatalytic reactor 5, and the water in the water tank is pumped into the water inlet of the water ring vacuum pump 202 through a submersible pump. The water outlet of the water ring vacuum pump 202 is the exhaust port. The working water of the water ring vacuum pump 202 is treated by the small gas-liquid separator 205, and the small gas-liquid separator 205 transports the separated gas and the waste gas to the resin adsorption tower together. The small gas-liquid separator 205 connects the separated water to the water tank again through the drain port, thereby forming a cycle. Without the need for an external water source, the water ring vacuum pump can work uninterruptedly, thereby improving work 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, and the separated liquid is sent to the oil-water separator 4 together with the extracted oil-water mixture for further separation. The non-aqueous phase 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 box 8 provides a solubilizing agent to the extraction well, and the reagent box 8 provides an oxidizing agent to the photocatalytic reactor 5. The reagent box 8 stores the solubilizing agent and the oxidizing agent. The solubilizing agent is an existing solubilizing agent, which is injected into the contaminated stratum of the extraction well and coupled with the multiphase extraction unit to improve the extraction efficiency. The oxidizing agent mainly includes an oxidizing agent and an acid solution for adjusting pH. After the wastewater is separated by the oil-water separator 4 and enters the pipeline, the oxidizing agent is added according to the proportion to enter the photocatalytic reactor 5 for purification treatment to improve the oxidation efficiency. A metering pump 3 is arranged on the pipeline between the reagent box 8 and the photocatalytic reactor 5, and the metering pump 3 can adjust the amount of the oxidizing agent. The external fuel tank of the generator set 9 is arranged 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 arranged in parallel, and the photocatalytic reactor 5 is connected to one of them. The resin adsorption tower 6 is provided with a regeneration steam inlet 601, a regeneration steam outlet 602, an air outlet 603, an air inlet 604, a cooling water inlet 605, a water outlet 606, a feeding port 607, a water inlet 608, a hand hole 609, a sewage outlet 610, an adsorption tower gas-liquid separation layer 611, a resin adsorption layer 612, a regeneration steam pipeline 613 and a gas-liquid distributor 614; when working, the waste gas separated by the gas-liquid separator 201 is transported to the resin adsorption tower 6 for purification treatment, and the waste liquid is transported to the photocatalytic reactor 5 for purification treatment. When the wastewater treatment requires a higher standard, the wastewater can be treated by switching the pipeline, and then transported to the water inlet 608 of the resin adsorption tower 6 by the delivery pump for further deep treatment after being treated by the photocatalytic reactor 5. The treated water is connected to the external water storage tank through the water outlet 606, which solves the problem of low purification efficiency of the miniaturized photocatalytic reactor and meets the demand for deep treatment of wastewater.

[0033] The resin adsorption tower 6 can treat wastewater and waste gas at the same time. Compared with the general resin adsorption tower, in order to realize the waste gas and wastewater purification function at the same time, the upper end of the resin adsorption tower is provided with an adsorption tower gas-liquid separation layer 611, which can output the purified waste gas and wastewater separately. The middle end of the resin adsorption tower is provided with three layers of resin adsorption layers, the purpose is to avoid the problem that the traditional resin is stacked in the tower body and does not flow and the adsorption efficiency is low. The resin adsorption tower is also provided with a regeneration steam pipeline 613 that reciprocates up and down through the resin adsorption layer. When the adsorption material is traditional or saturated, high-temperature steam can be sprayed through the jet port on the pipeline to perform in-situ thermal regeneration of the resin material. The bottom end of the resin adsorption tower is also provided with a gas-liquid distributor to evenly distribute the waste liquid and waste gas.

[0034] The mobile vehicle body 1 is also provided with a heating system 11, which is arranged on the upper part of the oil-water separator 4 and parallel to the reagent box 8. When working, the heating plates on the oil-water separator 4 and the reagent box 8 can be heated to increase the preparation speed of the oxidizing agent and the solubilizing agent. At the same time, the viscosity of oil and water is controlled by temperature to solve the problem of low separation efficiency of miniaturized oil-water separation equipment. The heating system 11 heats the wastewater that meets the discharge standards to obtain high-temperature steam, and connects the regeneration steam inlet 601 and the regeneration steam outlet 602 of the resin adsorption tower 6 to perform in-situ thermal regeneration of the adsorption saturated resin. The waste heat can be recycled to solve the problem of low resin filling and low adsorption of miniaturized resin adsorption equipment, and realize efficient and continuous purification of tail gas.

[0035] The embodiment of the present invention can quickly reach the pollution site through the mobile body 1, use a multiphase extraction unit to extract pollutants in the soil and perform gas-liquid separation and oil-water separation, transport the waste gas to the resin adsorption tower installed on the mobile body, transport the waste liquid to the oil-water separator for separation, and transport the waste water to the photocatalytic reactor installed on the mobile body. The waste gas and waste water generated on site are disposed of in situ and in real time without the need for an external water source. All equipment is arranged on both sides of the mobile body, and the equipment can be repaired or disassembled and replaced on site through the middle maintenance channel. At the same time, a generator set is arranged to enable long-term continuous operation. The overall equipment has strong mobility and convenient operation, which greatly improves the disposal efficiency of the contaminated soil remediation site. The present invention has high site compatibility, and the removal efficiency is less affected by various pollutants and soil. Through in-situ treatment of wastewater and waste gas, recycling of wastewater, and utilization of solubilizing agents in the heating agent box, coupled with efficient solubilization, it has strong adaptability to pollutants and soil, and the removal rate is stable at more than 90%. The heating adsorbent and oxidizing agent are then utilized, so that the present invention can maintain efficient operation under low pollution concentration, stabilize the repair rate of the whole process, and reduce the tailing phenomenon.

[0036] like Figure 7 As shown, the present invention provides a control method for an integrated device for multi-phase extraction and tail gas wastewater treatment, comprising the following steps:

[0037] After the reagent box injects the solubilizing agent into the extraction well, the generator set starts, and the controller controls the water ring vacuum pump and the jet pump to extract and generate negative pressure. The multiphase extraction unit extracts the volatile and semi-volatile organic pollutants in the underground soil pores in a multiphase manner. The flow sensor feeds back the extraction flow in real time. If the flow rate is greater than 2.5m 3 / h, gradually close the electric ball valve to reduce the flow rate. If the flow rate is less than 1m 3 / h, the heating system heats the solubilizing agent in the agent box 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 the gas-liquid separator for gas-liquid separation, and the separated waste gas is sent to the 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 of the outlet concentration to the inlet concentration of the resin adsorption tower is greater than 10%, it means that the adsorbent in the resin adsorption tower has penetrated, and the heating system is started to heat the qualified wastewater to generate high-temperature steam, and the high-temperature steam is passed into the resin adsorption tower to regenerate the adsorbent through the high-temperature steam; if the ratio of the outlet concentration to the inlet concentration of the resin adsorption tower is ≥80%, it means that the adsorbent in the resin adsorption tower is saturated, and the air intake of the resin adsorption tower needs to be stopped and heated for regeneration. The adsorbent is replaced after multiple heating cycles;

[0039] The waste liquid after separation by the gas-liquid separator is sent to the oil-water separator for separation through the buffer water tank. If the viscosity of the oil-water mixture is greater than 120cP, the heating system is turned on to heat the oil-water separator to reduce the viscosity. The separated waste oil is collected in the oil storage tank for storage, and the separated wastewater is sent to the photocatalytic reactor for treatment by the delivery pump. The agent box simultaneously delivers the oxidizing agent to the photocatalytic reactor to enhance the decomposition of pollutants. The treated wastewater meets the secondary emission standard; part of the secondary qualified wastewater is transported to the resin adsorption tower through a pipeline for treatment so that the wastewater meets the primary emission standard. The primary qualified wastewater is transported to the water inlet of the water ring vacuum pump through an external water storage tank for recycling, and the remaining secondary qualified wastewater can be directly discharged or stored.

Claims

1. A multiphase extraction and tail gas wastewater treatment integrated device, characterized in that: The invention comprises at least one small multiphase extraction unit (2) connected to an extraction well, a reagent box (8) storing a solubilizing agent and an oxidizing agent, a resin adsorption tower (6) for treating waste gas, an oil-water separator (4) for treating waste liquid, a photocatalytic reactor (5) for treating waste water, an oil storage tank (7) for storing waste oil, a heating system (11) for heating the reagent box and the oil-water separator and providing high-temperature steam for the resin adsorption tower, and a controller (10), wherein the reagent box is connected to the extraction well and the photocatalytic reactor (5) respectively, and the multiphase extraction unit (2) comprises a gas-liquid separator (201), a water ring vacuum pump (202) and a jet pump (208), wherein the extracted gas-liquid mixture is separated into gas and liquid by the gas-liquid separator, the waste gas is transported to the resin adsorption tower by the water ring vacuum pump, the waste liquid and the extracted oil-water mixture are transported to the oil-water separator by the jet pump respectively, the waste water is transported to the photocatalytic reactor, and the waste oil is transported to the oil storage tank.

2. The integrated device for multiphase extraction and tail gas wastewater treatment according to claim 1, characterized in that: An electric ball valve (204) and a buffer water tank (203) are sequentially connected between the gas-liquid separator (201) and the jet pump (208).

3. The integrated device for multiphase extraction and tail gas wastewater treatment according to claim 1, characterized in that: A flow sensor (206) for monitoring the extraction speed is arranged on the pipeline of the gas-liquid separator (201).

4. The integrated device for multiphase extraction and tail gas wastewater treatment according to claim 1, characterized in that: The inlet of the jet pump (208) is connected to a filter (207) for filtering the oil-water mixture.

5. The integrated device for multiphase extraction and tail gas wastewater treatment according to claim 1, characterized in that: A metering pump (3) for regulating the amount of oxidizing agent is provided on the pipeline between the agent box (8) and the photocatalytic reactor (5).

6. The integrated device for multiphase extraction and tail gas wastewater treatment according to claim 1, characterized in that: The water ring vacuum pump (202) is connected to a small gas-liquid separator (205) for separating working water of the water ring vacuum pump.

7. The integrated device for multiphase extraction and tail gas wastewater treatment according to claim 1, characterized in that: The number of the resin adsorption towers (6) is at least two, the photocatalytic reactor (5) is connected to one of the resin adsorption towers (6), and the wastewater that meets the standards after being treated by the photocatalytic reactor (5) is transported to the resin adsorption tower (6) for treatment.

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

9. The integrated device for multiphase extraction and tail gas wastewater treatment according to claim 1, characterized in that: The oil-water separator (4) and the reagent box (8) are both provided with a heating plate connected to a heating system (11), and the heating system (11) is connected to a wastewater discharge pipeline that meets the standards and a resin adsorption tower gas path.

10. A control method for the integrated device for multiphase extraction and tail gas and wastewater treatment according to any one of claims 1 to 9, characterized in that: The steps include: After the reagent box injects the solubilizing agent into the extraction well, the generator set starts, and the controller controls the water ring vacuum pump and the jet pump to extract and generate negative pressure. The multiphase extraction unit extracts the volatile and semi-volatile organic pollutants in the pores of the underground soil in multiphase. The flow sensor feeds back the extraction flow in real time. If the flow>V max , gradually close the electric ball valve to reduce the flow rate. If the flow rate is less than V min The heating system heats the solubilizing agent in the agent box 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 the gas-liquid separator for gas-liquid separation, and the separated waste gas is sent to the 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 ratio threshold, the clean tail gas is output. If the ratio of the outlet concentration to the inlet concentration of the resin adsorption tower is greater than the ratio threshold, it means that the adsorbent in the resin adsorption tower has penetrated, and the heating system is started to heat the qualified wastewater to generate high-temperature steam, and the high-temperature steam is passed into the resin adsorption tower to regenerate the adsorbent by the high-temperature steam; if the ratio of the outlet concentration to the inlet concentration of the resin adsorption tower is greater than or equal to the maximum ratio threshold, it means that the adsorbent in the resin adsorption tower is saturated, and the resin adsorption tower needs to be stopped from taking in air and heated for regeneration. The adsorbent is replaced after multiple heating cycles; The waste liquid after separation by the gas-liquid separator is sent to the oil-water separator for separation through the buffer water tank. If the viscosity of the oil-water mixture is greater than the viscosity threshold, the heating system is turned on to heat the oil-water separator to reduce the viscosity. The separated waste oil is collected in the oil storage tank for storage, and the separated wastewater is sent to the photocatalytic reactor for treatment by the delivery pump. The agent box simultaneously delivers the oxidizing agent to the photocatalytic reactor to enhance the decomposition of pollutants, and the treated wastewater meets a certain emission standard; part of the wastewater that meets the standard is transported to the resin adsorption tower through a pipeline for treatment so that the wastewater meets a higher level of emission standards. The wastewater that meets the higher level of emission standards is transported to the water inlet of the water ring vacuum pump through an external water storage tank for recycling, and the rest of the wastewater that meets the standard can be directly discharged or stored.

Images