Soil pore water sampling devices and methods for evaluating the long-term effects of soil pollution remediation

Abstract

This invention relates to a soil pore water sampling device and a method for evaluating the long-term effectiveness of soil pollution remediation. The soil pore water sampling device includes a sampling module and a spraying module. The sampling module includes a sampling well with a seepage zone on its wall, allowing pore water from the surrounding soil to flow into the well. The spraying module sprays water onto the soil around the sampling well. In use, the above-mentioned soil pore water sampling device first sets up a sampling well in the soil to be tested, then uses the spraying module to spray the soil, simulating the precipitation infiltration process of the soil under natural conditions for time T. Then, the pore water in the soil after the spraying is collected through the sampling well, and the concentration of pollutants in the pore water is analyzed to obtain the leaching concentration of pollutants in the soil after rainfall leaching for time T under natural conditions, effectively shortening the in-situ testing time for long-term soil remediation.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, and in particular to a soil pore water sampling device and a method for evaluating the long-term effects of soil pollution remediation. Background Technology

[0002] With the increasing discharge of chemical fertilizers, pesticides, industrial wastewater, and other toxic and harmful pollutants, chemical pollutants enter the soil through various pathways. Because heavy metal pollutants cannot be decomposed by soil microorganisms, they gradually accumulate in the soil environment. Some heavy metals can even transform into more toxic methyl compounds in the soil, threatening soil ecological security. Furthermore, heavy metals can enter the human body through the food chain or groundwater, further impacting human health. Compared to heavy metal pollution in aquatic environments, heavy metal pollution in soil environments is more difficult to remediate and poses a greater threat.

[0003] Stabilization is a commonly used pollution remediation technology for heavy metal pollution control in soil. It generally involves treating contaminated soil with heavy metal inhibitors and strengthening cementing agents to convert soluble heavy metals into chemically inert forms, thereby reducing the migration and leaching capacity of heavy metals in the soil and lowering the toxicity of heavy metal pollution.

[0004] Currently, the effectiveness evaluation of stabilization technologies still mainly relies on testing methods for the leaching toxicity of solid waste to leach stabilization products. However, in natural environments, stabilized soils are subjected to long-term leaching processes caused by rainfall, which can gradually activate heavy metals, allowing them to enter the soil pore water and contaminate the underlying soil through the vadose zone, threatening drinking water safety. Pore water is the primary medium for the leaching of heavy metals from the stabilized area by rainfall. Therefore, monitoring the concentration of pollutants in pore water within the stabilization area, which connects the soil and groundwater processes, is of great significance for evaluating the effectiveness of contaminated site stabilization and remediation.

[0005] There are two methods for sampling pore water: destructive sampling, which involves non-in-situ extraction of pore water, primarily through methods such as pressing, centrifugation, and vacuum filtration. This method can lead to changes in soil physicochemical properties, resulting in measured data that may not fully reflect actual conditions, making it unsuitable for long-term, location-based studies. In-situ sampling, on the other hand, involves using equipment such as buried sampling tubes to collect samples in situ over a long period, allowing for the study of dynamic changes in the soil solution over a specific timeframe. Therefore, to obtain accurate results for heavy metal remediation in soil, long-term waiting at the remediation site and multiple in-situ samplings are required. This process is complex, time-consuming, and inefficient, severely impacting the research progress of soil remediation agents and the efficiency of evaluating soil remediation effectiveness. Summary of the Invention

[0006] Therefore, it is necessary to provide a soil pore water sampling device and a method for evaluating the long-term effects of soil pollution remediation in order to address the problem of low efficiency in evaluating soil remediation effectiveness.

[0007] A soil pore water sampling device, comprising:

[0008] The sampling module includes a sampling well, the well wall of which is provided with a seepage zone for pore water in the soil around the sampling well to flow into the sampling well;

[0009] A spray module is used to spray water onto the circumferential soil of the sampling well.

[0010] The aforementioned soil pore water sampling device, during operation, first sets up sampling wells in the area where the soil to be tested is located. A spray module is then used to spray the soil to simulate the precipitation infiltration process of the soil under natural conditions over a time T. The pore water in the soil after the sprayed precipitation is collected through the sampling wells, and the concentration of pollutants in the pore water is analyzed to obtain the leaching concentration of pollutants in the soil after rainfall leaching for a time T under natural conditions. This effectively shortens the in-situ testing time for long-term soil remediation effects. When the soil to be tested is remediated soil, this evaluation method can measure the leaching concentration of pollutants in the remediated soil after rainfall leaching for a time T, effectively shortening the in-situ detection time for long-term soil remediation effects. For the stabilization remediation treatment of heavy metals in soil, heavy metals are only transformed into an inactive state in the soil; they are not removed from the soil. Since the spray module can simulate the precipitation volume under natural conditions over a period of time T, this device can simulate the leaching process of the treated soil under natural precipitation, detect the long-term leaching effect of heavy metals in the treated soil in the natural environment, and thus evaluate the long-term effect of soil pollution remediation.

[0011] In one embodiment, the sampling module further includes a water collection tank located at the bottom of the sampling well for containing pore water flowing in through the seepage zone. The seepage zone is arranged circumferentially along the sampling well to form a seepage section, and the bottom of the seepage zone is located above the water collection tank.

[0012] In one embodiment, a plurality of first suction pipes are provided on the seepage zone, the plurality of first suction pipes are arranged at intervals along the circumference of the sampling well, the first suction pipes are arranged at an angle to the side wall of the sampling well, and the angle between the first suction pipes and the side wall of the sampling well is less than 90°.

[0013] Multiple second suction pipes are provided on the seepage zone. The multiple second suction pipes are arranged at intervals along the circumference of the sampling well. The second suction pipes are arranged at an angle to the side wall of the sampling well. The angle between the second suction pipes and the side wall of the sampling well is less than 90°. The second suction pipes are arranged at an angle to the first suction pipe.

[0014] In one embodiment, the sampling module includes a water level sensor and a water sample lift pump. The water level sensor is electrically connected to the water sample lift pump and is located in the water collection tank to detect the water level in the water collection tank. The inlet of the water sample lift pump is connected to the water collection tank and is used to automatically sample the pore water according to the water level in the water collection tank.

[0015] In one embodiment, the spray module includes a plurality of water injection wells, which are circumferentially spaced around the sampling well. The bottom of each water injection well is permeable to water for injecting water into the soil at the bottom of the well. The vertical distance between the bottom wall of the water injection well and the bottom wall of the sampling well is greater than the vertical distance between the top of the seepage zone and the bottom wall of the sampling well.

[0016] In one embodiment, the spray module further includes a water injection tank, a water injection pump, and a spray head. One end of the water injection pump is connected to the water injection tank, and the other end of the water injection pump is connected to the spray head, which is located inside the water injection well.

[0017] In one embodiment, the inner diameter of both the injection well and the sampling well is 0.05m to 0.1m, and the distance between the axis of the injection well and the axis of the sampling well is 0.1m to 0.5m.

[0018] In one embodiment, the height of the sampling well is not less than the depth of the soil to be tested, and the height of the seepage zone is less than the depth of the soil to be tested.

[0019] In one embodiment, the spray module is used to simulate the rainfall on the soil to be tested over a period of time. The annual rainfall of the area where the soil to be tested is located is H m, and the flat area of ​​the soil to be tested is A m. 2 The simulated precipitation period is T years, and the spray water volume of the sprinkler module is V m³. 3 V = H * A * T.

[0020] A method for evaluating the long-term effectiveness of soil pollution remediation, using the aforementioned soil pore water sampling device, comprises the following steps:

[0021] S1: Set up sampling wells on the soil to be tested;

[0022] S2: Based on the annual precipitation of the area where the soil to be tested is located, calculate the natural precipitation V on the soil to be tested within time T;

[0023] S3: The soil to be tested is sprayed using a spray module, and the water precipitation of the spray module is V;

[0024] S4: Detect the concentration of pollutants in the water sample from the sampling well.

[0025] The aforementioned method for evaluating the long-term effectiveness of soil pollution remediation employs a soil pore water sampling device. Sampling wells are first installed in the area where the soil to be tested is located. A spray module is then used to spray the soil to be treated, simulating the precipitation infiltration process of the soil in the natural environment over a time T. The pore water in the soil after the sprayed precipitation is collected through the sampling wells, and the concentration of pollutants in the pore water is analyzed to obtain the leaching concentration of pollutants in the soil after a rainfall leaching time T under natural conditions. When the soil to be tested is remediated, this evaluation method can measure the leaching concentration of pollutants in the remediated soil after a rainfall leaching time T, effectively shortening the in-situ detection time for long-term soil remediation effects. For the stabilization remediation treatment of heavy metals in soil, heavy metals are only transformed into an inactive state in the soil; they are not removed from the soil. Since the spray module can simulate the precipitation in the natural environment over a period of time T, this device can simulate the leaching process of the treated soil under the action of natural precipitation, detect the long-term leaching effect of heavy metals in the treated soil in the natural environment, and thus evaluate the long-term effectiveness of soil pollution remediation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a soil pore water sampling device in the soil to be treated in one embodiment;

[0027] Figure 2 This is a schematic diagram of the structure of a soil pore water sampling device in the treated soil in one embodiment;

[0028] Figure 3 This is a top view of a soil pore water sampling device in one embodiment;

[0029] Figure 4 This is a schematic diagram of the sampling well structure in one embodiment;

[0030] Figure 5 This is a flowchart of a method for evaluating the long-term effects of soil pollution remediation in one embodiment.

[0031] Reference numerals in the attached figures: 100, Soil pore water sampling device; 10, Sampling module; 11, Sampling well; 111, Infiltration zone; 112, First sealing zone; 113, Second sealing zone; 114, First suction pipe; 115, Second suction pipe; 12, Water collection tank; 13, Water level sensor; 14, Water sample lifting pump; 15, First flow meter; 20, Spraying module; 21, Water injection well; 22, Water injection tank; 23, Water injection pump; 24, Spray head; 25, Second flow meter; 30, Power supply module; 40, Soil to be tested; 41, Soil to be treated; 42, Treated soil; 43, Cover layer. Detailed Implementation

[0032] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] The following describes in detail, with reference to the accompanying drawings, some embodiments of the soil pore water sampling device 100 and the method for evaluating the long-term effects of soil pollution remediation.

[0034] like Figure 1 and Figure 2 As shown, in one embodiment, a soil pore water sampling device 100 is provided, including a sampling module 10 and a spraying module 20.

[0035] Specifically, the sampling module 10 includes a sampling well 11, such as Figure 4 As shown, the well wall of the sampling well 11 is provided with a seepage zone 111, which is used to allow pore water in the soil around the sampling well 11 to flow into the sampling well 11.

[0036] Specifically, such as Figure 4 As shown, in one embodiment, the sampling well 11 is further provided with a first sealing area 112 and a second sealing area 113 on its well wall. The first sealing area 112 and the second sealing area 113 are arranged around the circumference of the sampling well 11, and the seepage area 111 is arranged along the circumference of the sampling well 11, forming a seepage section. The first sealing area 112, the seepage area 111, and the second sealing area 113 are arranged sequentially along the axial direction of the sampling well 11. The first sealing area 112 and the second sealing area 113 are provided with impermeable well walls, while the seepage area 111 is provided with permeable well walls, so that pore water can only flow into the sampling well 111 from the seepage area 111, thereby controlling the sampling depth and sampling area of ​​the soil 40 to be tested in the sampling well 11. The first sealing area 112 and the second sealing area 113 are made of compacted clay, cement, concrete, or sodium bentonite well walls, while the seepage area 111 is made of quartz sand well walls.

[0037] The height h1 of the sampling well 11 is not less than the depth h2 of the soil 40 to be tested. The height h1 of the sampling well 11 is equal to the sum of the height h7 of the first sealing zone 112, the height h6 of the seepage zone 111, and the height h8 of the second sealing zone 113. The height h6 of the seepage zone 111 is less than the depth h2 of the soil 40 to be tested.

[0038] like Figure 1 As shown, when the sampling well 11 is placed in the soil to be treated 41, the height h1 of the sampling well 11 is not less than the depth h2 of the soil to be treated 41, h1>=h2; the height h6 of the seepage zone 111 is less than the depth h2 of the soil to be treated 41, h2>h6. Figure 2 As shown, when the sampling well 11 is set in the treated soil 42, since the surface of the treated soil 42 is also covered with a soil layer 43, the height h1 of the sampling well 11 is not less than the sum of the depth h2 of the treated soil 42 and the depth h5 of the soil layer 43, h1>=h2+h5; the height h6 of the seepage zone 111 is less than the depth h2 of the treated soil 42, h2>h6.

[0039] In this specific embodiment, h1 = h2, h1 is 1.0~1.5m, h6 is 0.4m~0.6m, h7 is 0.4m~0.6m, and h8 is 0.1m~0.2m.

[0040] Continue to refer to Figure 4 In one embodiment, a plurality of first suction pipes 114 are provided on the seepage area 111. The plurality of first suction pipes 114 are arranged at intervals along the circumference of the sampling well 11. The first suction pipes 114 are arranged at an angle to the side wall of the sampling well 11. The angle between the first suction pipes 114 and the side wall of the sampling well 11 is less than 90°. A plurality of second suction pipes 115 are provided on the seepage area 111. The plurality of second suction pipes 115 are arranged at intervals along the circumference of the sampling well 11. The second suction pipes 115 are arranged at an angle to the side wall of the sampling well 11. The angle between the second suction pipes 115 and the side wall of the sampling well 11 is less than 90°. The second suction pipes 115 are arranged at an angle to the first suction pipes 114. The first suction pipe 114 and the second suction pipe 115 are inserted into the soil to be tested 40 at an upward angle, so that the pore water in the soil to be tested 40 seeps into the first suction pipe 114 and the second suction pipe 115 through gravity or capillary action, and then flows into the sampling well 11, which helps to improve the sampling efficiency of the sampling well 11.

[0041] Among them, the first suction pipe 114 and the second suction pipe 115 correspond one to one, and the first suction pipe 114 and the second suction pipe 115 form a suction pipe group. Multiple suction pipe groups are evenly spaced along the circumference of the sampling well 11, and multiple suction pipe groups form a suction pipe layer around the sampling well 11. Multiple suction pipe layers are provided along the axial direction of the seepage zone 111.

[0042] In this specific embodiment, such as Figure 4 As shown, the angle A1 between the axis of the first suction pipe 114 and the side wall of the sampling well 11 is 25° to 40°, and the angle A2 between the axis of the first suction pipe 114 and the axis of the second suction pipe 115 is 10° to 20°. The angles between the first suction pipe 114, the second suction pipe 115 and the side wall of the sampling well are the inclinations of the first suction pipe 114 and the second suction pipe 115 relative to the vertical direction. Since the inclinations of the first suction pipe 114 and the second suction pipe 115 are within the above range, it can better ensure that pore water flows into the sampling well. At the same time, the angle between adjacent suction pipe groups is 20° to 30°, that is, the angle between the line connecting the adjacent suction pipe group and the axis of the sampling well 11 is 20° to 30°. Therefore, 18 to 12 suction pipe groups can be set around the sampling well.

[0043] Furthermore, the lengths of the first suction pipe 114 and the second suction pipe 115 are 0.5cm to 1.5cm, and the diameters are 0.5cm to 1.0cm.

[0044] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the sampling module 10 further includes a water collection tank 12, located at the bottom of the sampling well 11, for containing pore water flowing in through the seepage zone 111, the bottom of the seepage zone 111 being above the water collection tank 12. Furthermore, the water collection tank 12 is located within the second sealing zone 113 of the sampling well 11, and the height of the water collection tank 12 is less than the height of the second sealing zone 113.

[0045] Furthermore, the sampling module 10 includes a water level sensor 13 and a water sample lift pump 14. The water level sensor 13 is electrically connected to the water sample lift pump 14 and is located inside the water collection tank 12 to detect the water level in the water collection tank 12. The inlet of the water sample lift pump 14 is connected to the water collection tank 12 and is used to automatically sample pore water based on the water level in the water collection tank 12. A first flow meter 15 is provided between the water sample lift pump 14 and the water collection tank 12, and the first flow meter 15 is used to control the sampling flow rate of the water sample lift pump 14.

[0046] The spray module 20 is used to spray water onto the circumferential soil of the sampling well 11.

[0047] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the spray module 20 includes a plurality of water injection wells 21, which are arranged circumferentially around the sampling well 11. The bottom of the water injection well 21 is permeable to water for injecting water into the soil at the bottom of the water injection well 21. The vertical distance between the bottom wall of the water injection well 21 and the bottom wall of the sampling well 11 is greater than the vertical distance between the top of the seepage zone 111 and the bottom wall of the sampling well 11.

[0048] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the spray module 20 further includes a water injection tank 22, a water injection pump 23, and a spray head 24. One end of the water injection pump 23 is connected to the water injection tank 22, and the other end of the water injection pump 23 is connected to the spray head 24. The spray head 24 is located inside the water injection well 21. A second flow meter 25 is provided between the water injection pump 23 and the spray head 24. The second flow meter 25 is used to control the water injection flow rate of the spray module 20.

[0049] The height h3 of the water injection well 21 is less than or equal to the height h7 of the first sealing zone 112, so that the bottom of the water injection well 21 is located above the top of the seepage zone 111. The distance between the spray head 24 and the bottom of the water injection well 21 is h4. The size of h4 depends on the spray range of the spray head 24. That is, when the distance between the spray head 24 and the bottom of the water injection well 21 is h4, the spray range of the spray head 24 can just cover the bottom area of ​​the water injection well 21.

[0050] In this specific embodiment, h3 = h7, h3 is 0.4m to 0.6m, and h4 is 0.15m to 0.5m.

[0051] Specifically, such as Figure 3 As shown, in one embodiment, the inner diameter R1 of the sampling well 11 and the inner diameter R2 of the water injection well 21 are both 0.05m to 0.1m, and the distance L1 between the axis of the water injection well 21 and the axis of the sampling well 11 is 0.1m to 0.5m.

[0052] The aforementioned soil pore water sampling device 100, during use, first sets up a sampling well 11 in the area where the soil 40 to be tested is located, and uses a spray module 20 to spray the soil 41 to be treated, simulating the precipitation infiltration process of the soil 40 under natural environment within time T. Then, the pore water in the soil 40 after the sprayed precipitation is collected through the sampling well 11, and the concentration of pollutants in the pore water is analyzed to obtain the leaching concentration of pollutants in the soil after rainfall leaching for time T under natural conditions, effectively shortening the in-situ testing time for the long-term remediation effect of the soil. When the soil 40 to be tested is remediated soil, this evaluation method can measure the leaching concentration of pollutants in the remediated soil after rainfall leaching for time T, effectively shortening the in-situ detection time for the long-term remediation effect of the soil. For the stabilization and remediation of heavy metals in soil, the heavy metals are only transformed into an inactive state in the soil, but are not removed from the soil. Since the spray module 20 can simulate the precipitation in the natural environment over a period of time T, the device can simulate the leaching process of the treated soil 42 under the action of natural precipitation, detect the long-term leaching effect of heavy metals in the treated soil 42 in the natural environment, and thus evaluate the long-term effect of soil pollution remediation.

[0053] Specifically, in one embodiment, the spray module 20 is used to simulate the rainfall on the soil 40 to be tested over a period of time. The annual rainfall of the area where the soil 40 is located is H m, and the flat area of ​​the soil 40 is A m. 2 The simulated precipitation period is year T, and the spray water volume of sprinkler module 20 is V m³. 3 V = H * A * T.

[0054] Specifically, such as Figure 1 and Figure 2 As shown, in one embodiment, the soil pore water sampling device 100 further includes a power supply module 30, which is electrically connected to the water injection pump 23, the water level sensor 13, and the booster pump 14, respectively, for providing them with electrical energy. The power supply module 30 includes a solar cell.

[0055] like Figure 5 As shown, in one embodiment, a method for evaluating the long-term effectiveness of soil pollution remediation is provided, using a soil pore water sampling device 100, with the following steps:

[0056] S1: Set up sampling well 11 on the soil to be tested 40;

[0057] S2: Based on the annual precipitation in the area where the soil to be tested 40 is located, calculate the natural precipitation V on the soil to be tested 40 within time T;

[0058] S3: The soil to be tested 40 is sprayed using the spray module 20, and the precipitation of the spray module 20 is V;

[0059] S4: Detect the concentration of pollutants in the water sample from sampling well 11.

[0060] The aforementioned method for evaluating the long-term effectiveness of soil pollution remediation employs a soil pore water sampling device 100. First, a sampling well 11 is installed in the soil to be tested 40. A spray module 20 is used to spray the soil to be treated 41, simulating the precipitation infiltration process of the soil 40 under natural environmental conditions within time T. Then, the pore water in the soil 40 after the sprayed precipitation is collected through the sampling well 11, and the pollutant concentration is analyzed to obtain the leaching concentration of pollutants in the soil after rainfall leaching for time T under natural conditions. When the soil to be tested 40 is remediated soil, this evaluation method can measure the leaching concentration of pollutants in the remediated soil after rainfall leaching for time T, effectively shortening the in-situ detection time for long-term soil remediation effects. Furthermore, this method specifically simulates the pore water monitoring sampling device and specific process methods in natural rainfall, exhibiting a high degree of automation and applicability to the actual needs of large-area contaminated site remediation.

[0061] For the stabilization and remediation of heavy metals in soil, the heavy metals are only transformed into an inactive state in the soil, but are not removed from the soil. Since the spray module 20 can simulate the precipitation in the natural environment over a period of time T, the device can simulate the leaching process of the treated soil 42 under the action of natural precipitation, detect the long-term leaching effect of heavy metals in the treated soil 42 in the natural environment, and thus evaluate the long-term effect of soil pollution remediation.

[0062] Specifically, in one embodiment, the method for evaluating the long-term effectiveness of soil pollution remediation further includes the following steps:

[0063] S1: Set up a first sampling well 11 on the soil to be treated 41; calculate the natural precipitation V1 obtained by the soil to be treated 41 within time T based on the annual precipitation of the area where the soil to be treated 41 is located; use a spray module 20 to spray the soil to be treated 41, and the precipitation of the spray module 20 is V1; detect the pollutant content of the water sample in the first sampling well 11.

[0064] S2: Remediation treatment is carried out on the soil to be treated 41 to form treated soil 42;

[0065] S3: Set up a second sampling well 11 on the treated soil 42; calculate the natural precipitation V2 obtained by the treated soil 42 within time T based on the annual precipitation of the area where the treated soil 42 is located; spray the treated soil 42 with a spray module 20 to generate precipitation, and measure the precipitation V2 of the spray module 20; detect the pollutant concentration of the water sample in the sampling well 11.

[0066] The aforementioned method for evaluating the long-term effectiveness of soil pollution remediation employs a soil pore water sampling device 100. First, a first sampling well 11 is installed in the soil to be treated 41. A spray module 20 is used to spray precipitation onto the soil to be treated 41, simulating the precipitation infiltration process of the soil to be treated 41 within a time T in the natural environment. The pore water in the soil to be treated 41 after the spray precipitation is collected through the sampling well 11, and the pollutant concentration is analyzed. Then, the soil undergoes remediation treatment to form treated soil 42. A second sampling well 11 is installed in the treated soil 42, and the spray module 20 is used to spray precipitation onto the treated soil 42, simulating precipitation within a time T in the natural environment. The pollutant concentration in the pore water of the second sampling well 11 after the spray precipitation is detected. By comparing the pollutant concentrations in the pore water of the soil to be treated 41 and the treated soil 42, the soil remediation effect is obtained.

[0067] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0068] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0070] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0071] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A soil pore water sampling device, characterized in that, include: The sampling module includes a sampling well. The well wall of the sampling well is provided with a seepage zone, a first sealing zone, and a second sealing zone. The seepage zone is used to allow pore water in the soil around the sampling well to flow into the sampling well. The first sealing zone and the second sealing zone are arranged around the circumference of the sampling well, and the first sealing zone, the seepage zone, and the second sealing zone are arranged sequentially along the axial direction of the sampling well. A spray module is used to spray water onto the circumferential soil of the sampling well to reduce water content. The sampling module further includes a water collection tank located at the bottom of the sampling well, which is used to collect pore water flowing in through the seepage zone. The seepage zone is arranged circumferentially along the sampling well to form a seepage section, and the bottom of the seepage zone is located above the water collection tank. The sampling module also includes a water level sensor and a water sample lift pump. The water level sensor is electrically connected to the water sample lift pump and is located inside the water collection tank to detect the water level in the water collection tank. The inlet of the water sample lift pump is connected to the water collection tank and is used to automatically sample the pore water according to the water level in the water collection tank.

2. The soil pore water sampling device according to claim 1, characterized in that, Multiple first suction pipes are provided on the seepage area. The multiple first suction pipes are arranged at intervals along the circumference of the sampling well. The first suction pipes are arranged at an angle to the side wall of the sampling well. The angle between the first suction pipes and the side wall of the sampling well is less than 90°. Multiple second suction pipes are provided on the seepage zone. The multiple second suction pipes are arranged at intervals along the circumference of the sampling well. The second suction pipes are arranged at an angle to the side wall of the sampling well. The angle between the second suction pipes and the side wall of the sampling well is less than 90°. The second suction pipes are arranged at an angle to the first suction pipe.

3. The soil pore water sampling device according to claim 1, characterized in that, The spray module includes multiple water injection wells, which are circumferentially spaced around the sampling well. The bottom of each water injection well is permeable to water for injecting water into the soil at the bottom of the well. The vertical distance between the bottom wall of the water injection well and the bottom wall of the sampling well is greater than the vertical distance between the top of the seepage zone and the bottom wall of the sampling well.

4. The soil pore water sampling device according to claim 3, characterized in that, The spray module also includes a water injection tank, a water injection pump, and a spray head. One end of the water injection pump is connected to the water injection tank, and the other end of the water injection pump is connected to the spray head. The spray head is located inside the water injection well.

5. The soil pore water sampling device according to claim 3, characterized in that, The inner diameter of both the water injection well and the sampling well is 0.05 m to 0.1 m, and the distance between the axis of the water injection well and the axis of the sampling well is 0.1 m to 0.5 m.

6. The soil pore water sampling device according to claim 1, characterized in that, The height of the sampling well is not less than the depth of the soil to be tested, and the height of the seepage zone is less than the depth of the soil to be tested.

7. The soil pore water sampling device according to claim 1, characterized in that, The spray module is used to simulate the precipitation on the soil to be tested over a period of time. The annual precipitation of the area where the soil to be tested is located is H m, and the flat area of ​​the soil to be tested is A m. 2 The simulated precipitation period is T years, and the spray water volume of the sprinkler module is V m³. 3 V = H * A * T.

8. A method for evaluating the long-term effectiveness of soil pollution remediation, characterized in that, Using the soil pore water sampling device according to any one of claims 1-7, the steps are as follows: S1: Set up sampling wells on the soil to be tested; S2: Based on the annual precipitation of the area where the soil to be tested is located, calculate the natural precipitation V on the soil to be tested within time T; S3: The soil to be tested is sprayed using a spray module, and the water precipitation of the spray module is V; S4: Detect the concentration of pollutants in the water sample from the sampling well.

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