Method for synergistic treatment of organic contaminated soil and groundwater

Abstract

The application provides a kind of organic contaminated soil and groundwater synergic treatment method, belong to soil treatment technical field, including first determining to be managed area and the flow direction of groundwater in to be managed area, and to be managed area is divided into net format pollution area structure;In each grid area, multiple point sampling is carried out, and the corresponding repair liquid is configured;At least one first injection well is respectively arranged in each grid area, and the first injection well penetrates the to be managed area longitudinally downward;Second injection well is arranged at the upstream of each group of water management area;Intermittent reaction wall is arranged at the downstream of to be managed area, and the interception area of intermittent reaction wall corresponds to the position of second injection well;Circulation well is further arranged downstream of reaction area;Water circulation system is established between circulation well and second injection well, and the water circulation system is used to circulate the seepage water into groundwater.The organic contaminated soil and groundwater synergic treatment method provided by the application is convenient to operate, can improve the treatment effect, and shorten the treatment time.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of soil remediation, and more particularly to a method for treating organic contaminated soil and groundwater. BACKGROUND

[0002] Soil remediation refers to the use of physical, chemical and biological methods to transfer, absorb, degrade and transform pollutants in soil, so that the concentration is reduced to an acceptable level, or the toxic and harmful pollutants are converted into harmless substances. Groundwater remediation refers to the use of extraction, gas stripping, bioremediation, permeable reactive wall and other technologies to restore contaminated groundwater to its original water quality.

[0003] In the prior art, a remediation liquid is often used to remediate contaminated soil or groundwater. Horizontal directional wells are drilled at the four edges of the contaminated area, and the horizontal directional wells are horizontally through the contaminated area. The remediation liquid is added to the contaminated area through the horizontal directional wells to remediate the contaminated soil and groundwater. However, the horizontal directional well often needs to be through a large length during construction, which is inconvenient for construction. In addition, the treatment period is long, the time cost is high, and the treatment effect is poor when only the horizontal directional well is used for treatment. SUMMARY

[0004] The purpose of the present application is to provide a method for treating organic contaminated soil and groundwater, which aims to solve the technical problems of inconvenient construction, long treatment period and poor treatment effect in the existing soil and groundwater treatment scheme.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is to provide a method for treating organic contaminated soil and groundwater, comprising:

[0006] S1. Determine the to-be-treated area and the flow direction of groundwater in the to-be-treated area, and divide the to-be-treated area into a grid pollution area structure; define the direction perpendicular to the groundwater flow direction as the first direction;

[0007] S2. Use a sampling device to take multiple samples in each grid area; determine the soil pollution degree of the corresponding grid area according to the soil sample condition of each grid area in the to-be-treated area, configure a suitable soil remediation liquid; divide the multiple grid areas of the to-be-treated area into multiple groups of water treatment areas arranged adjacent along the first direction, determine the groundwater pollution degree of the corresponding water treatment area according to the groundwater sample condition of each grid area in each group of water treatment areas, and configure a suitable groundwater remediation liquid;

[0008] S3. At least one first injection well is arranged in each grid area, the first injection well vertically penetrates the to-be-treated area downward, and the first injection well is used for injecting the soil remediation liquid corresponding to the grid area;

[0009] S4. A second injection well is arranged upstream of each of the water treatment zones, and is used for injecting the groundwater remediation liquid; an intermittent reaction wall is arranged downstream of the water treatment zone, and the interception area of the intermittent reaction wall corresponds to the position of the second injection well, and the reaction area of the intermittent reaction wall corresponds to the connection area between two adjacent second injection wells; a circulation well is further arranged downstream of the reaction area;

[0010] S5. A water circulation system is established between the circulation well and the second injection well, and is used for circulating the percolation water extracted from the circulation well into the groundwater of the water treatment zone through the second injection well.

[0011] In a possible implementation, in step S2, the determination of the groundwater pollution degree of each water treatment zone according to the groundwater sample of each grid area in each water treatment zone comprises:

[0012] S21. The groundwater pollution degree of each grid area in each water treatment zone is determined.

[0013] S22. The groundwater pollution degrees of each grid area are sequentially arranged according to the light and heavy grades, and the pollution degree of the middle grade in the light and heavy grades is defined as the pollution degree of the corresponding water treatment zone.

[0014] In a possible implementation, the first injection wells are arranged in multiple groups in the direction of the groundwater flow, and the positions of two adjacent groups of first injection wells are staggered in the direction of the groundwater flow.

[0015] In some embodiments, the first injection wells are axially spaced apart by multiple transverse branch wells.

[0016] In a possible implementation, the water circulation system comprises sequentially connected extraction components, a reaction tower and water injection components; the inflow end of the extraction component is in communication with the circulation well, and the outflow end of the water injection component is in communication with the second injection well; the inflow end of the reaction tower is further connected with a liquid injection component, and the liquid injection component is used for inputting a first remediation liquid into the reaction tower.

[0017] In some embodiments, a first detection component is arranged at the outflow end of the extraction component; a direct discharge pipeline is arranged between the outflow end of the extraction component and the inflow end of the water injection component.

[0018] The first detection component is used for detecting the circulation water extracted by the extraction component, and when the detected pollution degree is higher than or equal to a first preset value, the circulation water enters the reaction tower; and when the detected pollution degree is lower than the first preset value, the circulation water enters the direct discharge pipeline.

[0019] Exemplarily, a second detection assembly is arranged at the outflow end of the reaction tower; a reflux pipeline is arranged between the outflow end of the reaction tower and the inflow end of the reaction tower;

[0020] The second detection assembly is used to detect the reaction water at the outflow end of the reaction tower. When the pollution degree detected is higher than or equal to a second preset value, the reaction water is circulated to the reaction tower through the reflux pipeline; when the pollution degree detected is lower than the second preset value, the reaction water enters the water injection assembly.

[0021] In some embodiments, the inflow end of the extraction assembly is provided with a mesh filter, and the outflow end is further provided with a sedimentation tank; the outflow end of the extraction assembly is connected to the reaction tower through the sedimentation tank.

[0022] Exemplarily, the outflow end of the liquid injection assembly is further connected to the inflow end of the water injection assembly, and the liquid injection assembly is used to input a second repair liquid into the water injection assembly.

[0023] Exemplarily, the liquid injection assembly comprises:

[0024] The mixing and proportioning machine is provided with a plurality of inflow pipelines, each of which is used to proportion and feed a component of the first repair liquid or the second repair liquid.

[0025] Two groups of control valves are arranged on the conveying pipeline between the mixing and proportioning machine and the reaction tower, and on the conveying pipeline between the mixing and proportioning machine and the water injection assembly.

[0026] Compared with the prior art, the scheme shown in the embodiments of the present application can divide the area to be treated into grid areas, facilitate sampling in each grid area, and determine the soil and groundwater pollution degree of each grid area, so as to obtain accurate sample information and configure corresponding soil remediation liquid and groundwater remediation liquid, thereby avoiding the problems of excessive treatment and improper treatment. The first injection well is arranged, and the corresponding soil remediation liquid is input into the first injection well in each grid area, so as to realize targeted repair of the area to be treated. The second injection well and the water treatment area are arranged, so that the corresponding groundwater remediation liquid is injected into the corresponding water treatment area, so as to realize targeted repair of the groundwater. The intermittent reaction wall is arranged, and the positions of the interception area and the reaction area of the intermittent reaction wall are arranged, so that the contaminated groundwater and the injected groundwater remediation liquid are fully mixed and repaired. Further, the mixed liquid after repair can penetrate from the reaction area to the circulation well, so as to be circulated to the second injection well through the water circulation system. The first injection well, the second injection well and the circulation well arranged in the present application are all longitudinal wells, which are convenient for construction operation. The corresponding soil remediation liquid and groundwater remediation liquid are determined by accurate sampling method, targeted treatment is carried out, and the water circulation system is supplemented to form a closed loop treatment, so as to improve the treatment effect and shorten the treatment time. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 The profile structure schematic diagram of the organic contaminated soil and groundwater cooperative treatment method provided by the embodiments of the present application is shown in the following figure.

[0029] Figure 2 The top view structure schematic diagram of the organic contaminated soil and groundwater cooperative treatment method provided by the embodiments of the present application is shown in the following figure.

[0030] Figure 3 The structure schematic diagram of the water circulation system provided by the embodiments of the present application is shown in the following figure.

[0031] Fig. 1: 1, ground; 2, impermeable layer; 3, first injection well; 31, lateral branch well; 4, second injection well; 5, circulation well; 6, intermittent reaction wall; 61, reaction zone; 62, interception zone; 7, extraction assembly; 8, reaction tower; 9, water injection assembly; 10, first detection assembly; 11, direct discharge pipeline; 12, second detection assembly; 13, return pipeline; 14, mesh filter; 15, sedimentation tank; 16, liquid injection assembly; 161, mixing and proportioning machine; 162, inflow pipe; 163, outflow pipe; 17, pollution zone; 18, water treatment zone; 19, water storage tank. DETAILED DESCRIPTION

[0032] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "several" is two or more, unless otherwise explicitly specified.

[0035] For the convenience of description, the arrows A in the drawings of the present application are used to represent the flow direction of groundwater; the arrows B in the drawings of the present application are used to represent the first direction; and, for the convenience of understanding, the ground 1 and the impermeable layer 2 placed below the area to be treated in the drawings of the present application are marked. Figure 1 Figure 1 The arrows A in the drawings of the present application are used to represent the flow direction of groundwater; the arrows B in the drawings of the present application are used to represent the first direction; and, for the convenience of understanding, the ground 1 and the impermeable layer 2 placed below the area to be treated in the drawings of the present application are marked. Figure 2

[0036] Please refer to Figures 1 to 3 together, the organic contaminated soil and groundwater cooperative treatment method provided by the present application will be described. The organic contaminated soil and groundwater cooperative treatment method comprises the following steps: ​​

[0037] S1. First determine the area to be treated and the flow direction of groundwater in the area to be treated, and divide the area to be treated into a grid pollution area structure; define the direction perpendicular to the groundwater flow direction as the first direction;

[0038] S2. Use the sampling device to take multiple point samples in each grid area; determine the soil pollution degree of the corresponding grid area according to the soil sample condition of each grid area in the area to be treated, configure appropriate soil remediation liquid; divide the multiple grid areas of the area to be treated into multiple groups of water treatment areas 18 arranged adjacent along the first direction, determine the groundwater pollution degree of the corresponding water treatment area 18 according to the groundwater sample condition of each grid area in each group of water treatment areas 18, and configure appropriate groundwater remediation liquid;

[0039] S3. At least one first injection well 3 is arranged in each grid area respectively, the first injection well 3 penetrates the area to be treated longitudinally downward, and the first injection well 3 is used for injecting the soil remediation liquid corresponding to the grid area;

[0040] S4. A second injection well 4 is arranged at the upstream of each group of water treatment areas 18, the second injection well 4 is used for injecting the groundwater remediation liquid; an intermittent reaction wall 6 is arranged at the downstream of the area to be treated, and the interception area 62 of the intermittent reaction wall 6 corresponds to the position of the second injection well 4, the reaction area 61 of the intermittent reaction wall 6 corresponds to the connection area between two adjacent second injection wells 4; a circulation well 5 is further arranged at the downstream of the reaction area 61;

[0041] S5. A water circulation system is established between the circulation well 5 and the second injection well 4, and the water circulation system is used for circulating the percolation water extracted from the circulation well 5 to the groundwater in the area to be treated through the second injection well 4.

[0042] It should be noted that the intermittent reaction wall 6 used in the present application is a prior art, which includes a plurality of interception areas 62 arranged at intervals, and the interception area 62 is an impermeable area; a reaction area 61 is arranged between each two adjacent interception areas 62, and the reaction area 61 is a permeable area, and the reaction area 61 is injected with groundwater remediation liquid.

[0043] Since the interception area 62 of the intermittent reaction wall 6 corresponds to the position of the second injection well 4, the groundwater remediation liquid injected into the second injection well 4 and the groundwater in the area to be treated, as well as the mixture formed by the two, will be intercepted before the interception area 62 and diverted to the reaction area 61, and the groundwater in the area to be treated and the mixture can react in the reaction area 61 and penetrate through the intermittent reaction wall 6, and then enter the circulation well 5 downstream of the groundwater.

[0044] Compared with the prior art, the organic contaminated soil and groundwater cooperative treatment method provided by the application can divide the area to be treated into grid areas, facilitate sampling in each grid area, determine the soil and groundwater pollution degree of each grid area, obtain accurate sample information, and configure corresponding soil remediation liquid and groundwater remediation liquid, so that the problems of excessive treatment and improper treatment are avoided; the first injection well 3 is arranged, and the corresponding soil remediation liquid is input into the first injection well 3 in each grid area, so that targeted repair of the area to be treated is realized; the second injection well 4 and the water treatment area 18 are arranged, so that the corresponding groundwater remediation liquid is injected into the corresponding water treatment area 18, so that targeted repair of the groundwater is realized; the intermittent reaction wall 6 is arranged, and the positions of the interception area 62 and the reaction area 61 of the intermittent reaction wall 6 are arranged, so that the contaminated groundwater and the injected groundwater remediation liquid are fully mixed and repaired, and further, the mixed liquid after repair can penetrate from the reaction area 61 to the circulation well 5, so as to be circulated in the second injection well 4 through the water circulation system; the first injection well 3, the second injection well 4 and the circulation well 5 arranged in the application are all longitudinal wells, which are convenient for construction operation; the corresponding soil remediation liquid and groundwater remediation liquid are determined by the accurate sampling method, targeted treatment is carried out, and the water circulation system is used to form a closed loop treatment, so that the treatment effect is improved and the treatment time is shortened.

[0045] Further, when sampling each grid area, multi-point sampling in the grid area is required, and the intermediate level pollution degree in the multi-point is selected as the pollution degree of the corresponding grid area.

[0046] Please refer to Figure 1 In some possible embodiments, when determining the groundwater pollution degree of the corresponding water treatment area 18 in step S2, the following steps are included:

[0047] S21. Determine the groundwater pollution degree of each grid area in each group of water treatment areas 18;

[0048] S22. Arrange the groundwater pollution degrees of each grid area in order according to the light and heavy grades, and define the intermediate level pollution degree in the light and heavy grades as the pollution degree of the corresponding water treatment area 18.

[0049] In order to avoid excessive pollution to the area to be treated, the intermediate level pollution degree of each grid area and water treatment area 18 is respectively taken as the pollution degree of the corresponding grid area or water treatment area 18; and since the water circulation system is also arranged in the application, the treatment effect of the early stage can be judged in time, and the problem of poor treatment effect is avoided.

[0050] Please refer to Figure 2 In some possible embodiments, the first injection well 3 is arranged in multiple groups along the direction of groundwater flow, and the positions of the adjacent two groups of first injection wells 3 along the direction of groundwater flow are staggered.

[0051] By arranging multiple groups of first injection wells 3 at intervals, full coverage of the area to be treated is achieved to avoid omissions; and by arranging the two adjacent groups of first injection wells 3 staggered along the direction of groundwater flow, the groundwater is prevented from driving the soil remediation liquid to flow in the same direction, thereby forming a treatment blind area.

[0052] Referring to Figure 1 In some embodiments, the axial direction of the first injection well 3 is provided with multiple lateral branch wells 31.

[0053] Optionally, the lateral wells are arranged in the form of gas or fluid injection to form gaps; preferably, the lateral branch wells 31 extend along the direction of groundwater flow to increase the injection range of the lateral branch wells 31 and expand the distribution range of the soil remediation liquid.

[0054] Referring to Figure 3 In some possible embodiments, the water circulation system comprises a pumping assembly 7, a reaction tower 8 and a water injection assembly 9 connected in sequence; the inflow end of the pumping assembly 7 is in communication with the circulation well 5, and the outflow end of the water injection assembly 9 is in communication with the second injection well 4; the inflow end of the reaction tower 8 is also connected with a liquid injection assembly 16 for inputting the first remediation liquid into the reaction tower 8.

[0055] Optionally, the water pumping assembly comprises at least one group of first water pumps for pumping the mixed liquid of groundwater and groundwater remediation liquid out of the circulation well 5, and the mixed liquid pumped out of the circulation well 5 is defined as the first mixed liquid.

[0056] Optionally, the water injection assembly 9 comprises at least one group of second water pumps for pumping the mixed liquid output from the reaction tower 8 into the second injection well 4, and the mixed liquid output from the reaction tower 8 is defined as the second mixed liquid.

[0057] It should be understood that the treatment of groundwater with a heavy degree of pollution in the present application is gradual, for example, if the pollution level of groundwater is divided into heavy, medium, light and target levels, the target level refers to a very light degree of groundwater pollution, and the groundwater can be self-repaired using the underground circulation system; assuming that the groundwater pollution degree is heavy, the groundwater remediation liquid injected into the second injection well 4 can repair the polluted groundwater to the medium level, and the groundwater remediation liquid injected into the reaction tower 8 again can repair it to the light level, and then the treated solution is injected into the second injection well 4 through the water injection assembly 9, at this time, the groundwater remediation liquid is added to the second injection well 4 again to repair it to the target level.

[0058] The reaction tower 8 is used to input an appropriate amount of groundwater remediation liquid into the first mixed liquid to further treat the first mixed liquid, so that the pollution level of the first mixed liquid is reduced to a certain degree, and the second mixed liquid is formed.

[0059] Referring to Figure 3 In some embodiments, a first detection component 10 is arranged at the outlet end of the extraction component 7; a direct discharge pipeline 11 is arranged between the outlet end of the extraction component 7 and the inlet end of the water injection component 9; wherein the first detection component 10 is used to detect the circulating water extracted by the extraction component 7, and when the pollution degree is higher than or equal to a first preset value, the circulating water enters the reaction tower 8; when the pollution degree is lower than the first preset value, the circulating water enters the direct discharge pipeline 11.

[0060] It should be understood that the first detection component 10 includes a detection instrument for detecting the water sample and a switch control valve, and the switch control valve is controlled to enable the detection instrument to detect the first mixed liquid.

[0061] Optionally, the first preset value can be set according to actual needs, the level of the first mixed liquid after treatment is estimated through the first preset value, and whether the treatment effect reaches the estimated level is determined through the second detection component 12.

[0062] The direct discharge pipeline 11 is arranged so that when the first mixed liquid reaches the target level, it is directly discharged back to the second injection well 4, and at this time, there is no need to add groundwater remediation liquid to the reaction tower 8 or the second injection well 4.

[0063] Referring to Figure 3 For example, a second detection component 12 is arranged at the outlet end of the reaction tower 8; a reflux pipeline 13 is arranged between the outlet end of the reaction tower 8 and the inlet end of the reaction tower 8; wherein the second detection component 12 is used to detect the reaction water at the outlet end of the reaction tower 8, and when the pollution degree is higher than or equal to a second preset value, the reaction water is circulated to the reaction tower 8 through the reflux pipeline 13; when the pollution degree is lower than the second preset value, the reaction water enters the water injection component 9.

[0064] The second detection component 12 is arranged to determine the pollution degree of the second mixed liquid and the pollution level after remediation, so that when the pollution degree is still heavy, the second mixed liquid is circulated to the reaction tower 8 through the reflux pipeline 13 for further remediation.

[0065] It should be understood that the treatment speed of groundwater in the water circulation system is faster than that of the second injection well 4 and the intermittent reaction wall 6, and the carrying capacity of the latter is more advantageous, so when the groundwater pollution is heavy, the treatment speed can be accelerated through the water circulation system, and the combination of the two can be used to cope with different scales of areas to be treated.

[0066] Referring to Figure 3 In some embodiments, the inlet end of the extraction component 7 is provided with a mesh filter 14, and the outlet end is further provided with a sedimentation tank 15; the outlet end of the extraction component 7 is connected to the reaction tower 8 through the sedimentation tank 15.

[0067] By setting the mesh filter 14, the extracted groundwater is filtered to avoid sand blocking the water pump; by setting the sedimentation tank 15, on one hand, water storage can be carried out to relieve the pressure of the reaction tower 8; on the other hand, the extracted groundwater can be filtered again to ensure smooth flow in the pipeline.

[0068] Please refer to Figure 3 , for example, the outflow end of the liquid injection assembly 16 is also connected with the inflow end of the water injection assembly 9, and the liquid injection assembly 16 is used to input the second repair liquid into the water injection assembly 9.

[0069] Specifically, the outflow end of the liquid injection assembly 16 is provided with an outflow pipe 163, and the outflow pipe 163 is provided with the control valve.

[0070] By inputting the second repair liquid into the water injection assembly 16 through the liquid injection assembly 16, the circulating liquid that does not reach the target level is repaired again. It should be noted that after the second repair liquid is injected through this step, the step of adding groundwater repair liquid in the second injection well 4 can be omitted.

[0071] Please refer to Figure 3 , for example, the liquid injection assembly 16 includes a mixing and proportioning machine 161 and two groups of control valves; the mixing and proportioning machine 161 is provided with a plurality of inflow pipes 162, and each inflow pipe 162 is used to correspondingly input a component of the first repair liquid or the second repair liquid; one group of control valves is arranged on the conveying pipeline between the mixing and proportioning machine 161 and the reaction tower 8, and the other group of control valves is arranged on the conveying pipeline between the mixing and proportioning machine 161 and the water injection assembly 9.

[0072] By setting the mixing and proportioning machine 161, different two or different proportioning soil repair liquids and groundwater repair liquids required are matched; and by setting the control valve, the output amount and output speed of the soil repair liquid and the groundwater repair liquid are controlled.

[0073] Further, the water storage tank 19 is arranged at the inflow end or the outflow end of the water injection assembly 9.

[0074] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for the synergistic treatment of organic contaminated soil and groundwater, characterized in that, The method comprises the following steps: S1. Determine the area to be treated and the flow direction of groundwater in the area to be treated, and divide the area to be treated into a grid pollution area structure; define the direction perpendicular to the groundwater flow direction as the first direction; S2. Use a sampling device to take multiple point samples in each grid area; determine the soil pollution degree of each grid area in the area to be treated according to the soil sample condition of each grid area, configure appropriate soil remediation liquid; divide the multiple grid areas of the area to be treated into multiple groups of water treatment areas arranged adjacent along the first direction, determine the groundwater pollution degree of each water treatment area according to the groundwater sample condition of each grid area in each group of water treatment areas, and configure appropriate groundwater remediation liquid; S3. At least one first injection well is arranged in each grid area, the first injection well penetrates the area to be treated longitudinally downward, and the first injection well is used for injecting the soil remediation liquid corresponding to the grid area; S4. A second injection well is arranged upstream of each group of water treatment areas, and the second injection well is used for injecting the groundwater remediation liquid; an intermittent reaction wall is arranged downstream of the area to be treated, and the interception area of the intermittent reaction wall corresponds to the position of the second injection well, and the reaction area of the intermittent reaction wall corresponds to the connection area between two adjacent second injection wells; a circulation well is further arranged downstream of the reaction area; S5. A water circulation system is established between the circulation well and the second injection well, and the water circulation system is used for circulating the percolation water extracted from the circulation well to the groundwater in the area to be treated through the second injection well; the water circulation system comprises an extraction assembly, a reaction tower and a water injection assembly connected in sequence; the inflow end of the extraction assembly communicates with the circulation well, and the outflow end of the water injection assembly communicates with the second injection well; the inflow end of the reaction tower is further connected with a liquid injection assembly, the liquid injection assembly is used for inputting a first remediation liquid into the reaction tower; a first detection assembly is arranged at the outflow end of the extraction assembly; a direct discharge pipeline is arranged between the outflow end of the extraction assembly and the inflow end of the water injection assembly; wherein the first detection assembly is used for detecting the circulating water extracted by the extraction assembly, when the pollution degree detected is higher than or equal to a first preset value, the circulating water enters the reaction tower; when the pollution degree detected is lower than the first preset value, the circulating water enters the direct discharge pipeline.

2. The method for treating organic contaminated soil and groundwater according to claim 1, wherein In step S2, the groundwater pollution degree of each group of water treatment areas is determined according to the groundwater sample condition of each grid area in each group of water treatment areas, which comprises: S21. Determine the groundwater pollution degree of each grid area in each group of water treatment areas; S22. Arrange the groundwater pollution degree of each grid area in order according to the light and heavy grades, and define the intermediate grade pollution degree in the light and heavy grades as the pollution degree corresponding to the water treatment area.

3. The method for treating organic contaminated soil and groundwater according to claim 1, wherein The first injection wells are arranged in multiple groups at intervals along the direction of the groundwater flow direction, and the positions of the adjacent two groups of first injection wells are staggered along the direction of the groundwater flow direction.

4. The method for treating organic contaminated soil and groundwater according to claim 3, wherein The first injection well is provided with a plurality of lateral branch wells in axial spacing.

5. The method for treating organic contaminated soil and groundwater according to claim 1, wherein A second detection assembly is arranged at the outflow end of the reaction tower; a reflux pipeline is arranged between the outflow end of the reaction tower and the inflow end of the reaction tower; The second detection assembly is configured to detect the reaction water at the outflow end of the reaction tower; when the pollution degree detected is higher than or equal to a second preset value, the reaction water is circulated to the reaction tower through the reflux pipeline; when the pollution degree detected is lower than the second preset value, the reaction water enters the water injection assembly.

6. The method for treating organic contaminated soil and groundwater according to claim 1, wherein The inflow end of the extraction assembly is provided with a mesh filter, and the outflow end is further provided with a sedimentation tank; the outflow end of the extraction assembly is connected to the reaction tower through the sedimentation tank.

7. The method for treating organic contaminated soil and groundwater according to claim 1, wherein The outflow end of the liquid injection assembly is further connected to the inflow end of the water injection assembly, and the liquid injection assembly is configured to input a second repair liquid into the water injection assembly.

8. The method for treating organic contaminated soil and groundwater according to claim 7, wherein The liquid injection assembly comprises: The mixing and proportioning machine is provided with a plurality of inflow pipes, each of which is configured to correspondingly input a component of the first repair liquid or the second repair liquid; Two groups of control valves are arranged on the conveying pipeline between the mixing and proportioning machine and the reaction tower, and on the conveying pipeline between the mixing and proportioning machine and the water injection assembly.

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