Soil and groundwater pollution coordinated remediation system and remediation method thereof

Abstract

The present invention provides a soil and groundwater pollution collaborative remediation system, which includes a multiphase extraction and remediation unit, a gas phase extraction and remediation unit and a groundwater circulation remediation unit. The groundwater circulation remediation unit includes a main well system, a circulation pumping and injection system, a pumping and injection pump and a dosing device. The main well system includes a circulation well, and at least three screen tubes are arranged from top to bottom in the circulation well, one of which is arranged above the static liquid level of the groundwater, and the upper and lower layers of the screen tubes arranged below the static liquid level of the underground are both provided with isolation sections. The extraction port of the gas phase extraction and remediation unit is arranged in the screen tube above the static liquid level of the groundwater, and the extraction port of the multiphase extraction and remediation unit and the injection port of the groundwater circulation remediation unit are arranged in the screen tube below the static liquid level of the underground. The soil and groundwater pollution collaborative remediation system of the present invention improves the soil and groundwater pollution remediation efficiency, thereby realizing the green, efficient and low-carbon synchronous removal of pollutants in soil and groundwater.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a soil and groundwater pollution coordinated remediation system. The present invention also relates to a remediation method having the soil and groundwater pollution coordinated remediation system. Background Art

[0002] Soil and groundwater pollution remediation technologies are mainly divided into in-situ remediation technology and ex-situ remediation technology. In-situ remediation technology is gaining increasing attention because of its flexible and simple operation, relatively low remediation cost, and small disturbance and impact on the environment and soil. Typical in-situ remediation technologies include: in-situ chemical oxidation / reduction, thermal desorption, multiphase extraction, gas phase extraction, groundwater circulation well, bioremediation, etc. Among them, gas phase extraction remediation technology is an in-situ remediation technology for removing volatile and semi-volatile organic matter in soil, with the characteristics of simple equipment, convenient operation, high efficiency, and low environmental harm; multiphase extraction is an in-situ remediation technology for removing pollutants in different forms in soil and groundwater (liquid groundwater, non-aqueous phase liquid (NAPL) volatile organic matter in the form of gas in the aeration zone soil layer), with the advantages of convenient operation, cleanliness and high efficiency. Groundwater circulation well remediation technology is an in-situ remediation technology for removing VOCs, NAPL and other pollutants in groundwater, with the advantages of simple operation, low remediation cost, small environmental disturbance, and low energy consumption.

[0003] Most existing technologies use extraction technology alone for repair or groundwater repair. Since the in-situ repair system requires the excavation of repair wells or circulation wells, the above two repair methods alone require the excavation of repair wells or circulation wells on site, which causes certain costs for the construction and repair. Summary of the invention

[0004] In view of this, the present invention aims to propose a soil and groundwater pollution coordinated remediation system to achieve targeted remediation according to the characteristics of pollutant concentration, promote pollutant recycling or harmless disposal, reduce the use of remediation agents, and reduce remediation costs.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A soil and groundwater pollution coordinated remediation system, comprising:

[0007] Multiphase extraction remediation unit, gas phase extraction remediation unit and groundwater circulation remediation unit;

[0008] The groundwater circulation restoration unit includes a main well system, a circulation pumping and injection system, a pumping and injection pump, and a dosing device;

[0009] The main well system comprises a circulation well, wherein at least three screen pipes are arranged from top to bottom in the circulation well, wherein one of the screen pipes is arranged above the static liquid level of groundwater, and the upper and lower layers of the screen pipes arranged below the static liquid level of groundwater are both provided with isolation sections;

[0010] The extraction port of the gas phase extraction and repair unit is arranged in the screen tube above the static liquid level of the groundwater, and the extraction port of the multiphase extraction and repair unit and the injection port of the groundwater circulation repair unit are arranged in the screen tube below the static liquid level of the groundwater;

[0011] The multiphase extraction and repair unit is provided with a first control valve, and the first control valve can control the on-off of the pipeline of the multiphase extraction and repair unit;

[0012] The gas phase extraction repair unit is provided with a second control valve, which can control the on-off of the pipeline of the gas phase extraction repair unit.

[0013] Furthermore, the main well system also includes a multi-stage filter layer coated on the outside of the inner wall of the circulation well;

[0014] The filter layers are sequentially provided with a first filter layer, a second filter layer and a third filter layer from the inner wall of the circulation well outward.

[0015] Furthermore, the filtration pore sizes of the first filter layer, the second filter layer and the third filter layer become larger in sequence.

[0016] Furthermore, the multiphase extraction and remediation unit includes a circulating extraction and injection system and an extraction and injection pump, a liquid phase treatment system, a liquid phase extraction pipeline, and a gas phase extraction pipeline arranged on the ground; the liquid pollutant phase extracted by the circulating extraction and injection system and the extraction and injection pump is pumped to the liquid phase treatment system through the liquid phase extraction pipeline for remediation;

[0017] The gaseous pollutants extracted by the circulating extraction and injection system and the extraction and injection pump are transported to the gaseous extraction and repair unit through the gaseous extraction pipeline.

[0018] Furthermore, the liquid phase extraction pipeline includes an extraction pipeline and an injection pipeline, and a dosing device is provided on the extraction pipeline or the injection pipeline;

[0019] A third control valve is also provided on the pipeline provided with the dosing device, and the third control valve is used to control the on-off of the pipeline of the dosing device.

[0020] Furthermore, the liquid phase disposal system includes a primary separation facility, a secondary separation facility, an oil collection facility, a reaction sedimentation tank and a clear water tank.

[0021] Further, the gas phase extraction remediation unit includes a gas phase treatment system, and the gas phase treatment system includes a biodegradation facility, an advanced oxidation facility, a dehumidification facility, an activated carbon adsorption facility, and an activated carbon regeneration facility;

[0022] The extraction port of the gas phase extraction pipeline extends into the screen tube above the static liquid level of groundwater;

[0023] The outlet end of the gas phase extraction pipeline is communicated with the gas phase treatment system.

[0024] Furthermore, the soil and groundwater pollution coordinated remediation system also includes an aeration circuit connected to the outlet end of the gas phase disposal system;

[0025] The aeration circuit includes an aeration pipe, an aeration pump and a fourth control valve;

[0026] The fourth control valve is disposed between the aeration pump and the gas phase treatment system.

[0027] Furthermore, the aeration pipe includes a first air blowing pipe connected to the outlet end of the gas phase treatment system. The first air blowing pipe is arranged in the screen pipe below the underground static liquid level.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] The soil and groundwater pollution collaborative remediation system described in the present invention is provided with a multiphase extraction remediation unit, a gas phase extraction remediation unit and a groundwater circulation remediation unit. The multiphase extraction, gas phase extraction, groundwater circulation well and chemical reduction / oxidation remediation technology are efficiently coupled to form a multi-technology sequential integrated remediation system. According to the characteristics of pollutant concentration, one or more technologies are adapted for sequential integrated remediation to achieve targeted remediation, promote the comprehensive recycling or harmless disposal of valuable components in high-solubility pollutants, reduce the use of remediation agents, reduce remediation costs, further improve the soil and groundwater pollution remediation efficiency, and thus achieve green, efficient, and low-carbon simultaneous removal of pollutants in soil and groundwater.

[0030] In addition, by setting up a multi-stage filtration layer on the outside of the inner wall of the main well system and working together with the gas phase extraction and repair unit to form a reverse airflow, it is possible to backwash the attachments on the screen wall and avoid blockage of the screen.

[0031] The soil and groundwater pollution collaborative remediation system described in the present invention efficiently couples multiphase extraction, gas phase extraction, groundwater circulation wells and chemical reduction / oxidation remediation technology, and integrates gas phase, liquid phase extraction wells and groundwater circulation wells into one well. It has a compact structure, saves space, and is convenient for the indiscriminate conversion of different remediation technologies, reduces the number of wells drilled for different remediation technologies, and improves the efficiency of soil and groundwater remediation.

[0032] By setting up an aeration loop connected to the outlet end of the gas phase treatment system, it not only provides oxygen for aerobic microorganisms and improves the efficiency of biological reactions, but also promotes the upward movement of organic matter in groundwater into the soil aeration zone, and then is repaired by gas phase extraction.

[0033] Another object of the present invention is to provide a method for remediating soil and groundwater pollution coordinated remediation system as described above, comprising the following steps:

[0034] Step 1: Investigate the remediation site data based on the distribution of soil and groundwater pollutants, pollution concentration zones, pollution range boundaries and other information to determine the characteristics of the remediation site;

[0035] Step 2: Determine the well layout plan based on the data in step 1, specifically the number and distribution location of the main well system;

[0036] Step three, determine the remediation technology according to the well layout plan of step two; in the case of high-concentration organic pollution area, the first control valve is opened, the second control valve is closed, and the multiphase extraction remediation unit is used for remediation; when the oil-water separation efficiency is significantly reduced when the liquid phase disposal system separates the pollutants, the first control valve is closed, the second control valve is opened, and the groundwater circulation remediation unit and the gas phase extraction remediation unit are combined for remediation;

[0037] Step 4: After the groundwater extracted in step 3 passes through the separation process of the primary separation facility and the secondary separation facility, the organic pollutants are collected in the oil collection facility, and the final organic pollutants are sent to professional institutions for comprehensive recycling or harmless disposal.

[0038] The remediation method of the soil and groundwater pollution synergistic remediation system of the present invention combines the synergistic remediation of groundwater circulation and in-situ chemical oxidation with gas phase extraction, groundwater aeration and microbial coupled remediation, and forms a remediation period with two periods. Among them, in the early stage of remediation, the synergistic remediation of groundwater circulation and in-situ chemical oxidation is mainly carried out, supplemented by gas phase extraction and groundwater aeration coupled remediation, so as to efficiently repair organic pollutants in groundwater. In the later stage of remediation, the synergistic remediation efficacy of groundwater circulation and in-situ chemical oxidation is reduced, and the main remediation is gas phase extraction and underground aeration coupled remediation, supplemented by groundwater circulation and in-situ chemical oxidation synergistic remediation, which effectively solves the "tailing phenomenon" or "rebound" effect that is easy to occur in the remediation process, significantly reduces the use of chemical oxidizing agents, and greatly reduces the probability of "secondary pollution". BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0040] Figure 1This is a schematic diagram of the structure of the soil and groundwater pollution collaborative remediation system according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the structure of the soil and groundwater pollution coordinated remediation system and the aeration circuit according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the structure of a liquid phase disposal system according to an embodiment of the present invention;

[0043] Figure 4 It is a schematic diagram of the structure of the gas phase treatment system;

[0044] Figure 5 This is a schematic diagram of well layout in the contaminated site.

[0045] Description of reference numerals:

[0046] 1. Main well system; 2. Circulating pumping system and pumping pump; 3. Liquid phase treatment system; 4. Dosing device; 5. Extraction system and vacuum two-stage extraction pump; 6. Gas phase treatment system; 7. Groundwater static liquid level; 8. Multiphase extraction and groundwater circulation well; 9. Gas phase extraction and groundwater circulation well; 10. Aeration circuit;

[0047] 11. First screen tube; 12. Second screen tube; 13. Third screen tube; 14. Packing section; 15. First filter layer; 16. Second filter layer; 17. Third filter layer; 18. Sealing manhole cover;

[0048] 21. Liquid phase extraction tube; 22. Extraction control valve; 23. Injection control valve;

[0049] 31. Primary separation facility; 32. Secondary separation facility; 33. Oil collection facility; 34. Reaction sedimentation tank; 35. Clear water tank;

[0050] 41. Drug injection tube;

[0051] 51. Gas phase extraction tube; 52. Gas phase control valve;

[0052] 61. Biodegradation facilities; 62. Advanced oxidation facilities; 63. Dehumidification facilities; 64. Activated carbon adsorption facilities; 65. Activated carbon regeneration facilities;

[0053] 101. First air blowing pipe; 102. Fourth control valve; 103. Aeration pump. DETAILED DESCRIPTION

[0054] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0055] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "back", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0056] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0057] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0058] The present embodiment relates to a soil and groundwater pollution coordinated remediation system, which includes a multiphase extraction remediation unit, a gas phase extraction remediation unit and a groundwater circulation remediation unit. The groundwater circulation remediation unit includes a main well system 1, a circulation pumping system, a pumping pump and a dosing device 4.

[0059] The main well system 1 includes a circulation well, in which at least three screens are arranged from top to bottom, one of which is arranged above the static liquid level 7 of the groundwater, and the upper and lower layers of the screen arranged below the static liquid level of the groundwater are both provided with isolation sections 14. The extraction port of the gas phase extraction and repair unit is arranged in the screen above the static liquid level 7 of the groundwater, and the extraction port of the multiphase extraction and repair unit and the injection port of the groundwater circulation repair unit are arranged in the screen below the static liquid level of the groundwater.

[0060] In addition, the multiphase extraction repair unit is provided with a first control valve, which can control the on-off of the pipeline of the multiphase extraction repair unit; the gas phase extraction repair unit is provided with a second control valve, which can control the on-off of the pipeline of the gas phase extraction repair unit.

[0061] The soil and groundwater pollution coordinated remediation system of this embodiment is provided with a multiphase extraction remediation unit, a gas phase extraction remediation unit and a groundwater circulation remediation unit. The multiphase extraction, gas phase extraction and groundwater circulation well are efficiently coupled with chemical reduction / oxidation remediation technology to form a multi-technology continuous integrated remediation system. According to the characteristics of pollutant concentration, one or more technologies are adapted for continuous integrated remediation to achieve targeted remediation, promote the comprehensive recycling or harmless disposal of valuable components in high-solubility pollutants, reduce the use of remediation agents, reduce remediation costs, further improve the efficiency of soil and groundwater pollution remediation, and thus achieve green, efficient and low-carbon simultaneous removal of pollutants in soil and groundwater.

[0062] Based on the above overall introduction, an exemplary structure of the soil and groundwater pollution coordinated remediation system of this embodiment is as follows: Figure 1 As shown, the multiphase extraction and remediation unit, the gas phase extraction and remediation unit and the groundwater circulation remediation unit of this embodiment all use a main well system 1. The main well system 1 is the extraction well of the multiphase extraction and remediation unit and the gas phase extraction and remediation unit, and is also used as the circulation well of the groundwater circulation remediation unit.

[0063] According to the different uses of each repair unit, multiple screens are set in the repair well, and the groundwater static liquid level 7 is used as the boundary between the gas phase extraction repair unit and the multi-phase extraction repair unit. For the convenience of distinction, in this embodiment, the screen set above the groundwater static liquid level 7 is called the first screen 11, which is mainly used for extraction by the extraction pipe in the gas phase repair unit.

[0064] Furthermore, in this embodiment, there are two screen tubes arranged below the static liquid level 7 of groundwater, which are called the second screen tube 12 and the third screen tube 13 from top to bottom. Figure 1 Shown and Figure 3 As shown, the second screen tube 12 of this embodiment is connected to the injection port of the groundwater circulation repair unit. The third screen tube 13 of this embodiment is connected to the extraction port of the multiphase repair unit. Of course, the setting of the screen tube is not limited to the number shown in this embodiment, and can be adaptively increased according to the extraction effect.

[0065] As a preferred embodiment, the main well system 1 of this embodiment further includes a multi-stage filter layer coated on the outer side of the inner wall of the circulation well. The filter layer is sequentially provided with a first filter layer 15, a second filter layer 16 and a third filter layer 17 from the inner wall of the circulation well to the outside.

[0066] Furthermore, the filtration apertures of the first filter layer 15, the second filter layer 16 and the third filter layer 17 are successively larger. Figure 1 and Figure 3As shown, the first filter layer of this embodiment is composed of a grille net wrapped outside the main well pipe, and the pore size of the grille net is 0.5~1.0mm; the second filter layer is composed of the middle filter tube wall and the filling layer inside it, and the filling layer is filled with small-particle fine sand filler; the third filter layer is composed of the outermost filter tube wall and the filling layer inside it, and the filling layer is filled with large-particle fine sand filler.

[0067] The multi-stage filtration layer arranged in the main well system 1 described in this embodiment can prevent the circulation well from being blocked during the extraction process. By setting up three layers of filtration layers with different particle sizes, it can also achieve the purpose of layer-by-layer screening during the extraction process, thereby reducing the blockage of the circulation injection system and the injection pump 2 by large-particle liquid pollutants.

[0068] In addition, in order to improve the extraction effect, the second screen tube 12 and the third screen tube 13 are provided with isolation sections 14 in the upper and lower layers. The circulating water path of the groundwater circulation repair unit is effectively guaranteed by providing the isolation sections 14. In addition, in order to prevent external foreign matter from falling into the main well system 1, a sealing well cover 18 is also provided at the upper end of the main well system 1.

[0069] In this embodiment, the multiphase extraction and remediation unit includes a circulating extraction and injection system and an extraction and injection pump 2, a liquid phase treatment system, a liquid phase extraction pipe 21, and a gas phase extraction pipe 51 arranged on the ground; the liquid pollutant phase extracted by the circulating extraction and injection system and the extraction and injection pump 2 is extracted to the liquid phase treatment system through the liquid phase extraction pipe 21 for remediation. The gas phase pollutants extracted by the circulating extraction and injection system and the extraction and injection pump 2 are transported to the gas phase extraction and remediation unit through the gas phase extraction pipe 51.

[0070] High-concentration organic pollutants are extracted and separated by a multiphase extraction remediation unit, thereby reducing the amount of remediation agents used and improving remediation efficiency. At the same time, organic pollutants are collected in oil collection facilities 33 and sent to professional institutions for comprehensive recycling or harmless disposal, thus achieving green, low-carbon and efficient remediation.

[0071] The liquid phase extraction pipeline 21 includes an extraction pipeline and an injection pipeline, and a dosing device 4 is provided on the extraction pipeline or the injection pipeline; the pipeline provided with the dosing device 4 is also provided with a third control valve, and the third control valve is used to control the on-off of the pipeline of the dosing device 4. The dosing device 4 is arranged on the injection pipeline, and a reagent injection pipe 41 is arranged at the outlet end of the reagent, and the reagent injection pipe 41 is connected to the first screen tube 11.

[0072] By placing repair agents in the injection pipeline, the circulating water in the groundwater circulation repair unit is acted upon by the agents and plays a certain pre-repair role.

[0073] The first control valve is an extraction control valve 22, and the third control valve is an injection control valve 23. The circulating extraction and injection system and the extraction and injection pump 2 include: an extraction and injection pump, a liquid extraction pipe 21, an extraction control valve 22, and an injection control valve 23. The extraction control valve 22 is arranged on the extraction pipeline, and the injection control valve 23 is arranged on the injection pipeline.

[0074] When the contaminated site is a high-concentration organic pollution area, multiphase extraction is preferred as the main method, the extraction control valve 22 is opened, and the injection control valve 23 is closed. When pollution remediation is carried out in a medium- and low-concentration organic pollution area, a multi-technique integrated remediation system of gas phase extraction and groundwater circulation well is adopted. At this time, the extraction control valve 22 is closed, and the injection control valve 23 and the gas phase control valve 52 are opened.

[0075] The liquid phase treatment system 3 includes: a primary separation facility 31, a secondary separation facility 32, an oil collection facility 33, a reaction sedimentation tank 34, and a clear water tank 35. In terms of specific structure, Figure 3 As shown, the primary separation facility 31 of this embodiment is for gas-oil separation, the secondary separation facility 32 is for water-oil separation, and the polluted oil is collected through the oil collection facility 33.

[0076] As a preferred embodiment, the gas phase extraction remediation unit of this embodiment includes an extraction system and a vacuum two-stage extraction pump 5 and a gas phase disposal system 6, and the extraction system and the vacuum two-stage extraction pump 5 include a vacuum two-stage extraction pump and a gas phase control valve 52. The gas phase pollutants in the main well system 1 are extracted by the vacuum two-stage extraction pump.

[0077] like Figure 4 As shown, the gas phase extraction and remediation unit of this embodiment includes a gas phase treatment system 6, which includes a biodegradation facility 61, an advanced oxidation facility 62, a dehumidification facility 63, an activated carbon adsorption facility 64, and an activated carbon regeneration facility 65. The extraction port of the gas phase extraction pipe 51 extends into the sieve pipe above the static liquid level 7 of the groundwater. The outlet ends of the gas phase extraction pipes 51 are all connected to the gas phase treatment system 6.

[0078] As a preferred embodiment, in order to provide oxygen for aerobic microorganisms and improve the efficiency of biological reactions, the soil and groundwater pollution collaborative remediation system of this embodiment also includes an aeration circuit 10 connected to the outlet end of the gas phase treatment system 6, and the aeration circuit 10 includes an aeration pipe 101, an aeration pump 103 and a fourth control valve 102; the fourth control valve 102 is arranged between the aeration pump 103 and the gas phase treatment system 6.

[0079] The aeration pipe 101 extends from the air outlet of the aeration pump 103 into the main well system and into the third screen tube 13. In addition, the aeration loop 10 can also promote the upward movement of organic matter in the groundwater into the soil aeration zone, and then be extracted and repaired by the gas phase.

[0080] The aeration pipe includes a first air blowing pipe 101 connected to the outlet end of the gas phase treatment system 6. The first air blowing pipe 101 is arranged in the screen pipe below the underground static liquid level.

[0081] In addition, in order to save power and energy, the vacuum two-stage extraction pump of the gas phase extraction and repair unit can also be used as the energy and power of the aeration loop 10. In order to avoid the aeration loop 10 causing insufficient pressure of the gas phase extraction, resulting in poor effects of the gas phase extraction and the aeration loop 10, a fourth control valve 102 is set at the outlet of the gas phase disposal system 6. When the groundwater circulation unit is running or the liquid phase extraction in the multiphase extraction and repair unit is running, the fourth control valve 102 is closed, and when the gas phase extraction and repair unit is running, the fourth control valve 104 can be opened to ensure that the gas pressure is sufficient to achieve a better aeration effect.

[0082] The soil and groundwater pollution coordinated remediation system of this embodiment sets up a main well system 1, and combines the multiphase extraction remediation unit, the gas phase extraction remediation unit and the groundwater circulation remediation unit in different contaminated soil environments. Each of the above remediation technologies can be applied to its most suitable environmental conditions to improve the remediation efficiency. It is suitable for the remediation of multi-scenario, multi-type and complex contaminated sites.

[0083] This embodiment also relates to a restoration method using the soil and groundwater pollution coordinated restoration system as described above, such as Figures 1 to 5 As shown, it includes the following steps:

[0084] Step 1: Investigate the remediation site data based on the distribution of soil and groundwater pollutants, pollution concentration zones, pollution range boundaries and other information to determine the characteristics of the remediation site;

[0085] Step 2: Determine the well layout plan based on the data from step 1, specifically the number and distribution location of the main well system 1; Figure 5 As shown in , for different pollution conditions in the same polluted area, there are well layout plans for multiphase extraction and groundwater circulation wells 8, and well layout plans for gas phase extraction and groundwater circulation wells. Two types of equipment can also be set in one main well system 1;

[0086] Step three, determine the remediation technology based on the well layout plan of step two. In the case of high-concentration organic pollution areas, the extraction control valve 22 is opened, the injection control valve 23 is closed, and the multiphase extraction remediation unit is used for remediation; when the oil-water separation efficiency is significantly reduced when the liquid phase disposal system 3 separates pollutants, the extraction control valve 22 is closed, the injection control valve 23 is opened, and the groundwater circulation remediation unit and the gas phase extraction remediation unit are combined for remediation;

[0087] Step 4: The gas treated by the gas phase treatment system 6 enters the deep groundwater, that is, the location of the third sieve tube 3, disturbs the organic pollutants in the groundwater, adsorbs the total pollutants in the groundwater, enters the soil aeration zone, and is finally extracted by the gas phase.

[0088] Step 5: After the groundwater extracted in step 3 passes through the separation process of the primary separation facility 31 and the secondary separation facility 32, the organic pollutants are collected in the oil collection facility 33, and the final organic pollutants are sent to professional institutions for comprehensive recycling or harmless disposal.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A soil and groundwater pollution coordinated remediation system, characterized in that: include: Multiphase extraction remediation unit, gas phase extraction remediation unit and groundwater circulation remediation unit; The groundwater circulation restoration unit comprises a main well system (1), a circulation pumping and injection system, a pumping and injection pump, and a dosing device (4); The main well system (1) comprises a circulation well, wherein at least three screen pipes are arranged from top to bottom in the circulation well, wherein one of the screen pipes is arranged above the static liquid level (7) of groundwater, and the upper and lower layers of the screen pipes arranged below the static liquid level of the groundwater are both provided with isolation sections (14); The extraction port of the gas phase extraction and repair unit is arranged in the screen tube above the static liquid level (7) of the groundwater, and the extraction port of the multiphase extraction and repair unit and the injection port of the groundwater circulation repair unit are arranged in the screen tube below the static liquid level of the groundwater; The multiphase extraction and repair unit is provided with a first control valve, and the first control valve can control the on-off of the pipeline of the multiphase extraction and repair unit; The gas phase extraction repair unit is provided with a second control valve, and the second control valve can control the on-off of the pipeline of the gas phase extraction repair unit; The multiphase extraction and repair unit comprises a circulating extraction and injection system and an extraction and injection pump (2) arranged on the ground, a liquid phase processing system, a liquid phase extraction pipe (21) and a gas phase extraction pipe (51); The liquid pollutant phase extracted by the circulating injection system and the injection pump (2) is pumped to the liquid phase treatment system through the liquid phase extraction pipe (21) for repair; The gaseous pollutants extracted by the circulating extraction system and the extraction pump (2) are transported to the gaseous extraction repair unit through the gaseous extraction pipe (51); The gas phase extraction and remediation unit comprises a gas phase treatment system (6), and the gas phase treatment system (6) comprises a biodegradation facility (61), an advanced oxidation facility (62), a dehumidification facility (63), an activated carbon adsorption facility (64), and an activated carbon regeneration facility (65); The extraction port of the gas phase extraction pipe (51) extends into the screen tube above the static liquid level (7) of the groundwater; The outlet end of the gas phase extraction pipe (51) is in communication with the gas phase treatment system (6).

2. The soil and groundwater pollution coordinated remediation system according to claim 1 is characterized by: The main well system (1) further comprises a multi-stage filter layer coated on the outside of the inner wall of the circulation well; The filter layers are provided with a first filter layer (15), a second filter layer (16) and a third filter layer (17) in sequence from the inner wall of the circulation well to the outside.

3. The soil and groundwater pollution coordinated remediation system according to claim 2 is characterized by: The filtration pore sizes of the first filtration layer (15), the second filtration layer (16) and the third filtration layer (17) increase in sequence.

4. The soil and groundwater pollution coordinated remediation system according to claim 3 is characterized by: The liquid phase extraction pipeline (21) comprises an extraction pipeline and an injection pipeline, and a dosing device (4) is provided on the extraction pipeline or the injection pipeline; A third control valve is also provided on the pipeline provided with the dosing device (4), and the third control valve is used to control the on-off of the pipeline of the dosing device (4).

5. The soil and groundwater pollution coordinated remediation system according to claim 4 is characterized by: The soil and groundwater pollution coordinated remediation system further comprises a liquid phase disposal system (3), wherein the liquid phase disposal system (3) comprises a primary separation facility (31), a secondary separation facility (32), an oil collection facility (33), a reaction sedimentation tank (34), and a clear water tank (35).

6. The soil and groundwater pollution coordinated remediation system according to claim 5 is characterized by: The soil and groundwater pollution coordinated remediation system also includes an aeration loop (10) connected to the outlet of the gas phase disposal system (6) and a gas phase extraction and groundwater circulation well (9); The aeration circuit (10) gas phase extraction and groundwater circulation well (9) comprises an aeration pipe, an aeration pump (103) and a fourth control valve (104); The fourth control valve (104) is arranged between the aeration pump (103) and the gas phase treatment system (6).

7. The soil and groundwater pollution coordinated remediation system according to claim 6 is characterized by: The aeration pipe comprises a first air blowing pipe (101) connected to the outlet end of the gas phase treatment system (6). The first air blowing pipe (101) is arranged in the screen pipe below the underground static liquid level.

8. A restoration method using the soil and groundwater pollution coordinated restoration system according to claim 1, characterized in that: The steps include: Step 1: Investigate the remediation site data based on the distribution of soil and groundwater pollutants, pollution concentration zones, pollution range boundaries and other information to determine the characteristics of the remediation site; Step 2, determining a well layout plan based on the data from step 1, specifically the number and distribution locations of the main well system (1); Step three, determining the remediation technology based on the well layout plan of step two, when the area is highly polluted by organic matter, the first control valve (22) is opened, the second control valve (81) is closed, and the multiphase extraction remediation unit is used for remediation; when the oil-water separation efficiency of the liquid phase treatment system (3) is significantly reduced when separating pollutants, the first control valve is closed, the second control valve is opened, and the groundwater circulation remediation unit and the gas phase extraction remediation unit are combined for remediation; Step 4: After the groundwater extracted in step 3 passes through the separation process of the primary separation facility (31) and the secondary separation facility (32), the organic pollutants are collected in the oil collection facility (33), and the final organic pollutants are sent to a professional organization for comprehensive recycling or harmless disposal.

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