Underground water non-aqueous phase liquid pollution treatment system

Abstract

The utility model relates to the technical field of sewage treatment, in particular to an underground water non-aqueous phase liquid pollution treatment system which comprises a tank body and a liquid extraction device, a partition plate and a filter element are sequentially arranged in the tank body and used for dividing the interior of the tank body into a flow stabilizing area, a filtering area and a pollution discharge area which are sequentially connected, and the liquid extraction device is used for conveying non-aqueous-phase liquid in an underground well into the flow stabilizing area of the tank body at a set speed. According to the underground water non-aqueous phase liquid pollution treatment system, the non-aqueous phase liquid is subjected to flow stabilization and layering through the tank body and then is filtered through the filter element, and in practical application, compared with the mode that the non-aqueous phase liquid is directly conveyed to the filter element to be filtered, the treatment efficiency of the non-aqueous phase liquid can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a groundwater non-aqueous phase liquid pollution treatment system. Background Art

[0002] Petrochemical enterprises are prone to the widespread presence of discontinuous, scattered light non-aqueous liquids (LNAPLs) contamination in groundwater. Currently, the most common method for treating LNAPLs is to extract them from underground wells and then use appropriate equipment for treatment. Although this method can treat LNAPLs in underground wells, it still presents the following problems:

[0003] 1. The liquid level in the underground well will fluctuate greatly during the extraction of the non-aqueous phase liquid, causing some of the non-aqueous phase liquid to adhere to the soil surface, thus affecting the treatment effect of the non-aqueous phase liquid;

[0004] 2. The water content of the extracted non-aqueous phase liquid is high;

[0005] 3. The treatment efficiency of non-aqueous liquid is low.

[0006] Therefore, there is an urgent need for a groundwater non-aqueous phase liquid pollution treatment system to solve the above problems. Utility Model Content

[0007] In order to solve the problems existing in the above-mentioned background technology, the present utility model provides a groundwater non-aqueous phase liquid pollution treatment system.

[0008] The technical solution of the utility model is as follows:

[0009] A groundwater non-aqueous phase liquid pollution treatment system includes a tank body and a liquid extraction device;

[0010] The interior of the tank body is sequentially provided with partitions and filter elements for dividing the interior of the tank body into a steady flow area, a filtration area and a sewage discharge area which are connected in sequence. The liquid extraction device is used to transport the non-aqueous phase liquid in the underground well to the steady flow area of ​​the tank body at a set rate.

[0011] Preferably, the number of the partition is at least one.

[0012] Preferably, the height of the partition is smaller than the height of the interior of the tank.

[0013] Preferably, the inner surface of the tank body and the outer surface of the partition are both coated with an oleophobic layer.

[0014] Preferably, the liquid extraction device includes a float and a liquid pump, the liquid inlet end of the liquid pump is connected to the float through a pipeline, and the liquid outlet end extends to the steady flow area of ​​the tank body through a pipeline. A plurality of water collection holes are provided on the surface of the float, and the float is made of a polymer material with a density less than that of water.

[0015] Preferably, the polymer material is polypropylene.

[0016] Preferably, a water distributor is provided at the end of the liquid outlet pipeline located in the steady flow area.

[0017] Preferably, the method further comprises a liquid injection device for delivering water into the groundwater layer of the underground well at the set rate.

[0018] Preferably, the liquid injection device includes an injection pump and a water collection tank, and the injection pump is arranged inside the water collection tank, and is used to transport the water in the water collection tank to the groundwater layer of the underground well at the set rate through a pipeline.

[0019] Preferably, a plurality of pressure monitors are provided on the top of the tank body for obtaining the pressure value inside the tank body in real time and releasing the pressure when the pressure value inside the tank body exceeds a safety threshold.

[0020] Preferably, water outlets are provided at the bottoms of the flow stabilization zone and the filtering zone.

[0021] Preferably, the water outlets at the bottom of the steady flow area and the filtering area are connected to the water collection tank of the liquid injection device through pipelines, and valves are provided on the pipelines.

[0022] Preferably, the tank body is provided with a liquid level gauge at the top of the filtration area for obtaining the liquid level value of the filtration area in real time, and opening the water outlets at the steady flow area and the bottom of the filtration area when the liquid level value exceeds a set value.

[0023] Preferably, the filter element is made of modified polyvinylidene fluoride, modified polytetrafluoroethylene or modified polyethersulfone.

[0024] According to the above technical solution, based on the groundwater non-aqueous phase liquid pollution treatment system, a tank body is set to stabilize the flow and stratify the non-aqueous phase liquid and then filter it with a filter element. In actual application, compared with directly transporting the non-aqueous phase liquid to the filter element for filtration, the treatment efficiency of the non-aqueous phase liquid can be effectively improved; and because the float is made of a polymer material with a density lower than that of water and has a plurality of water collection holes on its surface, the water content in the extracted non-aqueous phase liquid can be effectively reduced; and by the liquid extraction device extracting the non-aqueous phase liquid from the underground well at a set rate while the liquid injection device injects water into the groundwater layer at the same rate, groundwater level fluctuations can be effectively avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the groundwater non-aqueous liquid pollution treatment system.

[0026] Description of Reference Numerals

[0027] 1. Float; 2. Suction pump; 3. Water distributor; 4. Partition; 5. Pressure monitor; 6. Tank; 7. Liquid level gauge; 8. Filter element; 9. Steady flow area; 10. Filtration area; 11. Sewage discharge area; 12. Injection pump; 13. Water collection tank; 14. Underground well. DETAILED DESCRIPTION

[0028] The following describes the specific implementation of the embodiment of the present invention in detail with reference to the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the embodiment of the present invention and is not intended to limit the embodiment of the present invention.

[0029] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate relative importance or implicitly specify the quantity of the technical features indicated. Therefore, unless otherwise specified, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features; "plurality" means two or more. The term "comprising" and any variations thereof are intended to imply the non-exclusive inclusion, possible presence, or addition of one or more other features, units, components, and / or combinations thereof.

[0030] Furthermore, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0031] The utility model provides a groundwater non-aqueous phase liquid pollution treatment system, such as Figure 1 As shown, the groundwater non-aqueous phase liquid pollution treatment system includes a tank body 6 and a liquid extraction device;

[0032] The interior of the tank body 6 is provided with a partition 4 and a filter element 8 in sequence, which are used to separate the interior of the tank body 6 into a steady flow area 9, a filtration area 10 and a sewage discharge area 11 connected in sequence. The liquid extraction device is used to transport the non-aqueous phase liquid in the underground well 14 to the steady flow area 9 of the tank body 6 at a set rate.

[0033] According to the above technical solution, based on the groundwater non-aqueous phase liquid pollution treatment system, a steady flow area is set in the tank body to perform steady flow stratification on the non-aqueous phase liquid and then filter it with a filter element. In actual application, compared with directly transporting the non-aqueous phase liquid to the filter element for filtration, the treatment efficiency of the non-aqueous phase liquid can be effectively improved.

[0034] In the groundwater non-aqueous phase liquid pollution treatment system of the present invention, preferably, the number of the baffles 4 is at least one. Specifically, the number of the baffles 4 in the tank body 6 is determined based on the size of the tank body and the steady flow stratification effect in the steady flow area 9. Figure 1 As shown, two partitions 4 are spaced apart within the tank body 6 of the present invention, thereby providing two sequentially connected flow stabilization zones 9. In a specific embodiment, the height of the partitions 4 is less than the interior height of the tank body 6. Preferably, the height of the partitions 4 is two-thirds of the interior height of the tank body 6 to ensure a stable flow.

[0035] In the groundwater non-aqueous phase liquid contamination treatment system of the present invention, preferably, the inner surface of the tank body 6 and the outer surface of the partition 4 are coated with an oleophobic layer. Specifically, by coating the inner surface of the tank body 6 and the outer surface of the partition 4 with the oleophobic layer, adhesion of the non-aqueous phase liquid (light oil) can be effectively prevented, and the flow rate of the non-aqueous phase liquid entering the tank body 6 along the steady flow zone 9 to the filtration zone 10 can be accelerated.

[0036] In the groundwater non-aqueous phase liquid pollution treatment system described in the present invention, preferably, the liquid extraction device includes a float 1 and a liquid extraction pump 2. The liquid inlet end of the liquid extraction pump 2 is connected to the float 1 via a pipeline, and the liquid outlet end extends to the stable flow area 9 of the tank body 6 via a pipeline. The surface of the float 1 is provided with a plurality of water collection holes, and the float 1 is made of a polymer material with a density less than that of water. Specifically, the polymer material is polypropylene. By designing the float 1 with a density less than that of water, most of it, or even the entirety of it, can always float in the non-aqueous phase liquid layer above the water surface, thereby effectively reducing the water content of the extracted non-aqueous phase liquid.

[0037] In a further preferred embodiment, a water distributor 3 is provided at the end of the liquid outlet pipe located in the steady flow zone 9, thereby further avoiding large fluctuations of the non-aqueous phase liquid entering the steady flow zone 9, resulting in a longer time required to achieve steady flow stratification, thereby improving the treatment efficiency of the non-aqueous phase liquid.

[0038] In the groundwater non-aqueous phase liquid pollution treatment system described in the present invention, it is preferred that a liquid injection device is further included, which is used to transport water to the groundwater layer of the underground well 14 at the set rate. Specifically, the liquid injection device includes an injection pump 12 and a water collection tank 13, and the injection pump 12 is arranged inside the water collection tank 13, and is used to transport the water in the water collection tank 13 to the groundwater layer of the underground well 14 at the set rate through a pipeline. The water collection tank 13 is supplied with water by an external water supply system. By allowing the liquid injection device to inject water into the groundwater layer at the same rate while the liquid extraction device extracts the non-aqueous phase liquid from the underground well at a set rate, groundwater level fluctuations can be effectively avoided.

[0039] In the groundwater non-aqueous phase liquid pollution treatment system of the present invention, preferably, a plurality of pressure monitors 5 are provided on the top of the tank body 6 for obtaining the pressure value inside the tank body 6 in real time and releasing the pressure when the pressure value inside the tank body 6 exceeds the safety threshold, thereby ensuring that the pressure inside the tank body 6 is always within a safe range. Specifically, Figure 1 As shown, two pressure monitors 5 are provided on the top of the tank body 6, one on the left side of the filter element 8 and one on the right side of the filter element 8. The height of the filter element 8 is the same as the internal height of the tank body 6. In order to facilitate the replacement of the filter element 8, a flange joint can be provided on the right side of the filter element 8, so that when the filter element 8 needs to be replaced, the tank body 6 can be opened through the flange joint.

[0040] In the groundwater non-aqueous phase liquid pollution treatment system described in the present invention, preferably, the bottom of the steady flow zone 9 and the filter zone 10 are both provided with a water outlet. Further preferably, the water outlets at the bottom of the steady flow zone 9 and the filter zone 10 are connected to the water collection tank 13 of the liquid injection device through a pipeline, and a valve is provided on the pipeline. Therefore, when no non-aqueous phase liquid such as light oil flows out of the outlet of the filter element 8, that is, when all the non-aqueous phase liquid diverted to the filter zone 10 is filtered, it indicates that the non-aqueous phase liquid in the underground well 14 has been completely processed. At this time, the valve on the pipeline can be opened to drain the water in the steady flow zone 9 and the filter zone 10. In a preferred embodiment, the tank body 6 is provided with a liquid level gauge 7 at the top of the filter zone 10 for obtaining the liquid level value of the filter zone 10 in real time, and when the liquid level value exceeds the set value, the water outlets at the bottom of the steady flow zone 9 and the filter zone 10 are opened. More specifically, when no non-aqueous phase liquid such as light oil flows out of the outlet of the filter element 8 and the liquid level value in the filter area 10 is greater than the height of the partition 4, the water outlet at the bottom of the steady flow area 9 and the filter area 10 is opened to ensure that all non-aqueous phase liquid in the filter area 10 is filtered.

[0041] In the groundwater non-aqueous phase liquid pollution treatment system described in the present invention, preferably, the filter element 8 is made of modified polyvinylidene fluoride, modified polytetrafluoroethylene or modified polyethersulfone, so as to ensure the filtering effect of non-aqueous phase liquids such as light oil. Specifically, modified polyvinylidene fluoride, modified polytetrafluoroethylene and modified polyethersulfone are warp and weft woven fabrics prepared by hydrophobic synthesis modification process and realized by in-situ functional synthesis and post-forming process, and have super hydrophobicity, water contact angle of 150° to 158°, oil-water separation efficiency> 95%, and flux> 1000L·m -2 ·h -1 , which can achieve the effect of oil passing through water but not water.

[0042] The present invention will be described in detail below through embodiments, but the protection scope of the present invention is not limited thereto.

[0043] Example 1

[0044] In a petrochemical site, the diameter of the underground well is 80mm, the well depth is 9m, the groundwater level is 3.5m deep, and the depth of light diesel is 1m. Figure 1 The groundwater non-aqueous phase liquid pollution treatment system shown is used to treat light diesel in an underground well. Specifically, the groundwater non-aqueous phase liquid pollution treatment system includes a tank body 6 and a liquid extraction device;

[0045] The interior of the tank body 6 is sequentially provided with a partition 4 and a filter element 8, which are used to separate the interior of the tank body 6 into a steady flow area 9, a filtration area 10, and a sewage discharge area 11, which are connected in sequence. The liquid extraction device is used to transport the non-aqueous phase liquid in the underground well 14 to the steady flow area 9 of the tank body 6 at a set rate; the filter element 8 is made of modified polyvinylidene fluoride;

[0046] The liquid extraction device includes a float 1 and a liquid pump 2. The liquid inlet end of the liquid pump 2 is connected to the float 1 through a pipeline, and the liquid outlet end extends to the stable flow area 9 of the tank body 6 through a pipeline. The surface of the float 1 is provided with a plurality of water collection holes. The float 1 is made of a polymer material with a density less than that of water; the polymer material is polypropylene.

[0047] A plurality of pressure monitors 5 are provided on the top of the tank body 6 for obtaining the pressure value inside the tank body 6 in real time and releasing the pressure when the pressure value inside the tank body 6 exceeds a safety threshold.

[0048] In actual application, the float 1 is first placed in the non-aqueous liquid layer in the underground well 14; then the liquid extraction pump 2 is controlled to transport the non-aqueous liquid to the steady flow area 9 at a set rate, and then the oil-water mixture entering the steady flow area 9 is first subjected to steady flow stratification in the steady flow area 9, specifically, the upper layer is light diesel and the lower layer is water. When the liquid level of the oil-water mixture in the steady flow area 9 is higher than the height of the partition 4, the light diesel in the upper layer is diverted to the filter area 10, and then the light diesel is filtered by the filter element 8. At this time, the light diesel entering the sewage area 11 is continuously discharged to the collection tank through the discharge port at the bottom of the sewage area 11; and when no light diesel flows out of the sewage area 11, it indicates that the steady flow area 9 and the filter area 10 are both water, and no longer contain light diesel, that is, the light diesel in the underground well 14 has been completely processed, and the liquid extraction pump 2 is turned off to complete the processing operation.

[0049] After testing, it was found that the groundwater non-aqueous phase liquid pollution treatment system described in the utility model, compared with the existing technical solutions, can effectively improve the treatment efficiency of the non-aqueous phase liquid by setting a tank body to stabilize the flow and stratify the non-aqueous phase liquid and then using a filter element to filter it, compared with directly transporting the non-aqueous phase liquid to the filter element for filtration; and because the float is made of a polymer material with a density lower than that of water and is provided with a plurality of water collection holes on the surface, the water content of the extracted non-aqueous phase liquid can be effectively reduced.

[0050] Example 2

[0051] Refer to Example 1 for implementation, except that there are two partitions 4 ; the height of the partition 4 is two-thirds of the internal height of the tank body 6 .

[0052] After testing, it was found that the groundwater non-aqueous phase liquid pollution treatment system described in the utility model, compared with the existing technical solutions, can more effectively improve the treatment efficiency of the non-aqueous phase liquid by setting a tank body to stabilize the flow and stratify the non-aqueous phase liquid and then using a filter element to filter it, compared with directly transporting the non-aqueous phase liquid to the filter element for filtration; and because the float is made of a polymer material with a density lower than that of water and is provided with a plurality of water collection holes on the surface, the water content of the extracted non-aqueous phase liquid can be effectively reduced.

[0053] Example 3

[0054] Refer to Example 2, except that the inner surface of the tank body 6 and the outer surface of the partition 4 are both coated with an oleophobic layer.

[0055] After testing, it was found that the groundwater non-aqueous phase liquid pollution treatment system described in the utility model, compared with the existing technical solutions, can more effectively improve the treatment efficiency of the non-aqueous phase liquid by setting a tank body to stabilize the flow and stratify the non-aqueous phase liquid and then using a filter element to filter it, compared with directly transporting the non-aqueous phase liquid to the filter element for filtration; and because the float is made of a polymer material with a density lower than that of water and is provided with a plurality of water collection holes on the surface, the water content of the extracted non-aqueous phase liquid can be effectively reduced.

[0056] Example 4

[0057] Refer to Example 3 for implementation, except that a water distributor 3 is provided at the end of the liquid outlet pipeline in the steady flow area 9 .

[0058] After testing, it was found that the groundwater non-aqueous phase liquid pollution treatment system described in the utility model, compared with the existing technical solutions, can more effectively improve the treatment efficiency of the non-aqueous phase liquid by setting a tank body to stabilize the flow and stratify the non-aqueous phase liquid and then using a filter element to filter it, compared with directly transporting the non-aqueous phase liquid to the filter element for filtration; and because the float is made of a polymer material with a density lower than that of water and is provided with a plurality of water collection holes on the surface, the water content of the extracted non-aqueous phase liquid can be effectively reduced.

[0059] Example 5

[0060] Refer to Example 4 for implementation, except that a water outlet is provided at the bottom of the steady flow zone 9 and the filter zone 10; the water outlets at the bottom of the steady flow zone 9 and the filter zone 10 are connected to the water collection tank 13 of the liquid injection device through a pipeline, and a valve is provided on the pipeline; the tank body 6 is located at the top of the filter zone 10 and is provided with a liquid level gauge 7 for obtaining the liquid level value of the filter zone 10 in real time, and opening the water outlets at the bottom of the steady flow zone 9 and the filter zone 10 when the liquid level value exceeds the set value.

[0061] In actual application, when no light diesel flows out of the outlet of the filter element 8 and the liquid level value in the filter area 10 is greater than the height of the partition 4, the water outlet at the bottom of the steady flow area 9 and the filter area 10 is opened to drain the water inside the tank body 6 for next use.

[0062] After testing, it was found that the groundwater non-aqueous phase liquid pollution treatment system described in the utility model, compared with the existing technical solutions, can effectively improve the treatment efficiency of the non-aqueous phase liquid and can be reused by setting a tank body to stabilize the flow and stratify the non-aqueous phase liquid and then using a filter element to filter it, compared with directly transporting the non-aqueous phase liquid to the filter element for filtration; and the float is made of a polymer material with a density lower than that of water and is provided with a plurality of water collection holes on the surface, which can effectively reduce the water content of the extracted non-aqueous phase liquid.

[0063] Example 6

[0064] Refer to Example 5 for implementation, but the difference is that it also includes a liquid injection device for transporting water to the groundwater layer of the underground well 14 at the set rate; the liquid injection device includes an injection pump 12 and a water collection tank 13, and the injection pump 12 is arranged inside the water collection tank 13, and is used to transport the water in the water collection tank 13 to the groundwater layer of the underground well 14 at the set rate through a pipeline.

[0065] In actual application, while the float 1 is placed in the non-aqueous liquid layer in the underground well 14, the outlet pipe of the injection pump 12 is placed in the groundwater layer; the liquid extraction pump 2 and the injection pump 12 are opened at the same rate, and are closed at the same time when the treatment of the light diesel is completed.

[0066] After testing, it was found that the groundwater non-aqueous phase liquid pollution treatment system described in the utility model, compared with the existing technical solutions, can effectively improve the treatment efficiency of non-aqueous phase liquid and reuse it by setting a tank body to stabilize the flow and stratify the non-aqueous phase liquid and then filtering it with a filter element compared to directly transporting the non-aqueous phase liquid to the filter element for filtration; and the float is made of a polymer material with a density lower than that of water and is provided with a plurality of water collection holes on the surface, which can effectively reduce the water content of the extracted non-aqueous phase liquid; and by having the liquid extraction device extract the non-aqueous phase liquid from the underground well at a set rate while the liquid injection device injects water into the groundwater layer at the same rate, the fluctuation of the groundwater level can be effectively avoided.

[0067] The groundwater non-aqueous phase liquid pollution treatment system provided by the utility model is characterized by providing a tank body to stabilize the flow and stratify the non-aqueous phase liquid and then using a filter element to filter it. In actual application, compared with directly transporting the non-aqueous phase liquid to the filter element for filtration, the treatment efficiency of the non-aqueous phase liquid can be effectively improved; and because the float is made of a polymer material with a density lower than that of water and is provided with a plurality of water collection holes on the surface, the water content of the extracted non-aqueous phase liquid can be effectively reduced; and because the liquid extraction device extracts the non-aqueous phase liquid from the underground well at a set rate while the liquid injection device injects water into the groundwater layer at the same rate, fluctuations in the groundwater level can be effectively avoided.

[0068] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made. To avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple variations and combinations should also be considered as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A groundwater non-aqueous phase liquid pollution treatment system, characterized in that: The groundwater non-aqueous phase liquid pollution treatment system comprises a tank (6) and a liquid extraction device; The interior of the tank body (6) is provided with a partition (4) and a filter element (8) in sequence, which are used to separate the interior of the tank body (6) into a steady flow area (9), a filtration area (10) and a sewage discharge area (11) which are connected in sequence. The liquid extraction device is used to transport the non-aqueous phase liquid in the underground well (14) to the steady flow area (9) of the tank body (6) at a set rate.

2. The groundwater non-aqueous phase liquid pollution treatment system according to claim 1, characterized in that: The number of the partition (4) is at least one.

3. The groundwater non-aqueous phase liquid pollution treatment system according to claim 1, characterized in that: The height of the partition (4) is smaller than the height inside the tank body (6).

4. The groundwater non-aqueous phase liquid pollution treatment system according to claim 1, characterized in that: The inner surface of the tank body (6) and the outer surface of the partition (4) are both coated with an oleophobic layer.

5. The groundwater non-aqueous phase liquid pollution treatment system according to claim 1, characterized in that: The liquid extraction device comprises a float (1) and a liquid extraction pump (2); the liquid inlet end of the liquid extraction pump (2) is connected to the float (1) via a pipeline, and the liquid outlet end extends to the steady flow area (9) of the tank body (6) via the pipeline; a plurality of water collection holes are provided on the surface of the float (1); and the float (1) is made of a polymer material having a density less than that of water.

6. The groundwater non-aqueous phase liquid pollution treatment system according to claim 5, characterized in that: The polymer material is polypropylene.

7. The groundwater non-aqueous phase liquid pollution treatment system according to claim 5, characterized in that: A water distributor (3) is provided at the end of the liquid outlet pipeline located in the steady flow area (9).

8. The groundwater non-aqueous phase liquid pollution treatment system according to claim 1, characterized in that: Also included is a liquid injection device for delivering water into the groundwater layer of the underground well (14) at the set rate.

9. The groundwater non-aqueous phase liquid pollution treatment system according to claim 8, characterized in that: The liquid injection device comprises an injection pump (12) and a water collecting tank (13); the injection pump (12) is arranged inside the water collecting tank (13) and is used to transport the water in the water collecting tank (13) to the groundwater layer of the underground well (14) at the set rate through a pipeline.

10. The groundwater non-aqueous phase liquid pollution treatment system according to claim 1, characterized in that: A plurality of pressure monitors (5) are provided on the top of the tank body (6) for obtaining the pressure value inside the tank body (6) in real time and releasing the pressure when the pressure value inside the tank body (6) exceeds a safety threshold.

11. The groundwater non-aqueous phase liquid pollution treatment system according to claim 1, characterized in that: The bottoms of the flow stabilization area (9) and the filtering area (10) are both provided with water outlets.

12. The groundwater non-aqueous phase liquid pollution treatment system according to claim 11, characterized in that: The water outlets at the bottom of the steady flow area (9) and the filtering area (10) are both connected to the water collecting tank (13) of the liquid injection device through pipelines, and valves are provided on the pipelines.

13. The groundwater non-aqueous phase liquid pollution treatment system according to claim 11, characterized in that: The tank body (6) is provided with a liquid level meter (7) at the top of the filtration area (10), which is used to obtain the liquid level value of the filtration area (10) in real time and open the water outlets at the bottom of the steady flow area (9) and the filtration area (10) when the liquid level value exceeds a set value.

14. The groundwater non-aqueous phase liquid pollution treatment system according to claim 1, characterized in that: The filter element (8) is made of modified polyvinylidene fluoride, modified polytetrafluoroethylene or modified polyethersulfone.

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