A pollutant diffusion model device in contaminated soil

Abstract

The present invention discloses a pollutant diffusion model device in contaminated soil, wherein buffer layers are arranged on the inner walls of both sides of the box, and water inlets and water outlets are connected one by one on the box walls of both sides of the box where the buffer layers are arranged, one buffer layer is connected to a water inlet pipe through the corresponding water inlet, and the other buffer layer is connected to a water outlet pipe through the corresponding water outlet, and a valve and a flow meter are installed on the water inlet pipe, and a plurality of water holes are evenly opened on each buffer layer; a test cylinder is erected in the box, and a water flow space is defined between the inner wall of the box and the two buffer layers respectively; both ends of the test cylinder are open, and the test cylinder is loaded with contaminated soil, and a plurality of flow holes are evenly opened on the side wall of the test cylinder, and both open ends of the test cylinder are blocked. The present invention discloses a pollutant diffusion model device in contaminated soil, which can simulate the influence of external factors on the diffusion of pollutants in contaminated soil, is simple and convenient, and saves labor.

Description

Technical Field

[0001] The present invention relates to the technical field of pollutant diffusion model simulation in contaminated soil, and more specifically to a pollutant diffusion model device in contaminated soil. Background Art

[0002] With the development of science and technology, people's lives are becoming more and more convenient, but at the same time, soil pollution has also occurred. In order to better control soil pollution, it is necessary to clearly understand the factors affecting the diffusion of pollutants in contaminated soil so as to be able to treat the contaminated soil in a targeted manner.

[0003] However, if we want to understand the factors that affect the diffusion of pollutants in contaminated soil and the degree of influence of these factors on the diffusion of pollutants in contaminated soil, it is not only difficult to install various test devices, but also requires a lot of labor if we observe on site.

[0004] Therefore, how to provide a pollutant diffusion model device in contaminated soil is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a pollutant diffusion model device in contaminated soil, which can simulate the influence of external factors on the diffusion of pollutants in contaminated soil. It is simple, convenient and labor-saving.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A pollutant diffusion model device in contaminated soil, comprising:

[0008] A box body, wherein buffer layers are arranged on the inner walls on both sides of the box body, and water inlets and water outlets are connected one by one on the box walls on both sides of the box body where the buffer layers are arranged, one of the buffer layers is connected to a water inlet pipe through the corresponding water inlet, and the other buffer layer is connected to a water outlet pipe through the corresponding water outlet, and valves and flow meters are installed on the water inlet pipe and the water outlet pipe, and a plurality of water holes are evenly opened on each of the buffer layers;

[0009] A test cylinder, which is vertically arranged in the box body and defines a water flow space between the inner wall of the box body and the two buffer layers respectively; both ends of the test cylinder are open, and the test cylinder is loaded with contaminated soil, and at the same time, a plurality of flow holes are evenly opened on the side wall of the test cylinder, and the two open ends of the test cylinder are blocked.

[0010] The present invention places the contaminated soil in the test cylinder. Since a plurality of flow holes are provided on the side wall of the test cylinder, the contaminated soil in the test cylinder can diffuse out through the plurality of flow holes. Therefore, when the valve is opened and the water flow is recorded by the flow meter, the water inlet pipe transports the external water to the corresponding buffer layer and then enters the water flow space through the plurality of water holes on the buffer layer. At the same time, the water in the water flow space can enter the buffer layer near the outlet pipe through the plurality of water holes near the outlet pipe and then flow out through the outlet pipe, so as to ensure that the water can evenly enter the contaminated soil in the test cylinder, so that the contaminated soil in the test cylinder can diffuse out through the flow holes with the water flow. The contaminated soil after the water flow is taken out in layers or zones, and the concentration of pollutants in the contaminated soil after the water flow is tested by a special instrument in each layer or each area, so that the concentration of pollutants in the corresponding contaminated soil under a certain water flow rate (the flow meter records the water flow, so the water flow rate can be inferred), that is, the present invention can simulate the diffusion effect of pollutants in the contaminated soil under a certain water flow rate. The present invention has a simple structure, is easy to operate, and saves labor.

[0011] Preferably, a plurality of temperature probes and a plurality of moisture sensors are embedded in the contaminated soil, and the plurality of temperature probes and the plurality of moisture sensors are embedded in the contaminated soil at intervals along the central axis of the test cylinder, and the plurality of temperature probes and the plurality of moisture sensors are electrically connected to a controller and a display screen in sequence.

[0012] The multiple temperature probes of the present invention are embedded in the contaminated soil at intervals along the central axis of the test cylinder and can be displayed on a display screen, thereby simulating the changes in the temperature field inside the contaminated soil under a freeze-thaw environment; and the multiple moisture sensors of the present invention are embedded in the contaminated soil at intervals along the central axis of the test cylinder and can be displayed on a display screen, thereby simulating the migration of moisture inside the contaminated soil under a freeze-thaw environment. Therefore, the present invention can provide more accurate test conditions for simulating the diffusion of pollutants in the contaminated soil through multiple temperature probes and multiple moisture sensors.

[0013] Preferably, the two buffer layers are arranged in a one-to-one correspondence on two opposite side walls of the box body.

[0014] The present invention makes two buffer layers face each other, which can not only make the water flow in a straight line, thereby increasing the speed of the water flow to carry away the contaminated soil, so as to improve the working efficiency of the present invention, but also can conform to the characteristics of the water flow to improve the authenticity of the simulation conditions of the present invention.

[0015] Preferably, the box body is a cuboid, and the buffer layer comprises:

[0016] A partition is vertically arranged in the box body close to and parallel to a side wall of the box body, and at the same time, two sides of the partition are connected one by one to two side walls of the box body perpendicular to the partition to define an accommodating cavity, and a plurality of water holes are evenly opened on the partition.

[0017] The present invention forms a containing cavity between a partition and the side wall of the box body, and a plurality of water holes are evenly opened on the partition, so that the water concentratedly input by the water inlet pipe can be evacuated in the containing cavity and enter the water flow space through the plurality of water holes. Similarly, the water in the water flow space is first evacuated through the plurality of water holes into the containing cavity near the water outlet pipe and then concentratedly discharged through the water pipe, so that the water can evenly flow through all the contaminated soil in the test cylinder, avoiding the water concentrating on flowing through only a certain part of the contaminated soil in the test cylinder, thereby improving the authenticity of the present invention's simulation of the pollutant diffusion conditions in the contaminated soil.

[0018] Preferably, the buffer layer further comprises:

[0019] Granular sand is filled in the receiving cavity.

[0020] The present invention can further improve the effect of the present invention on evacuating and buffering water by filling the accommodating cavity with granular sand.

[0021] Preferably, the granular sand is medium-coarse sand to avoid blocking the flow of water.

[0022] Preferably, a filter layer is fixed on a side surface of the partition close to the test cylinder.

[0023] The present invention not only does not affect the circulation of water through the filter layer (due to the multiple through holes on the filter layer), but also can prevent the contaminated soil diffused from the test tube from entering the containing cavity through the water through the water holes and then being discharged out of the box through the water outlet pipe, thereby preventing the pollutants diffused from the contaminated soil from causing secondary pollution to the external environment.

[0024] Preferably, one open end of the test cylinder is blocked by a cooling device, and the cooling device comprises:

[0025] A cryopanel, the cryopanel covers an open end of the test cylinder, a first cavity is opened inside the cryopanel, and an inlet and an outlet connected to the first cavity are respectively opened on a side surface of the cryopanel away from the test cylinder, the inlet is connected to a saline input pipe, and the outlet is connected to a saline output pipe;

[0026] A brine tank, wherein the brine tank is loaded with brine, and the temperature of the brine is between minus twenty-five degrees Celsius and minus thirty-five degrees Celsius; the brine inlet pipe and the brine outlet pipe are both connected to the brine tank, and control valves are installed on the brine inlet pipe and the brine outlet pipe.

[0027] The present invention can start the cooling device, and the cooling device can provide a continuous cold end temperature for the contaminated soil, so that the present invention can simulate the diffusion law of pollutants in the frozen soil and the frozen soil temperature, and can also cooperate with the water flow to grasp the influence of the contaminated soil on the diffusion of pollutants under the combination of low temperature and water flow;

[0028] Specifically: a cryopanel is installed on the top of the test tube of the present invention, and a brine input pipe and a brine output pipe are externally connected to the cryopanel. At the same time, the brine input pipe and the brine output pipe are both connected to the brine tank. Then, a first cavity, a brine input pipe, a brine output pipe and a brine tank formed in the cryopanel form a circulation loop. The brine tank contains low-temperature brine. In this way, a refrigeration circulation system can be formed on the top of the contaminated soil. The cryopanel can provide a continuous cold end temperature, thereby achieving the effect of simulating the diffusion law of pollutants in frozen soil and contaminated soil under freezing temperature.

[0029] In addition, brine is a widely used refrigerant, is cheap, has good controllability, and can achieve the desired cooling effect.

[0030] Preferably, the other open end of the test cylinder is blocked by a temperature increasing device, and the temperature increasing device comprises:

[0031] A high temperature plate, the high temperature plate and the low temperature plate are opposite to each other and cover the other open end of the test tube, and a second cavity is opened in the high temperature plate, and a threading hole connected to the second cavity is opened on the side wall of the high temperature plate;

[0032] An electric heater is embedded in the second cavity and is connected to a wire, which passes through the wire threading hole and is connected to a power source.

[0033] The present invention can start the heating device, and the heating device can provide a continuous heat source temperature to the contaminated soil, so that the present invention can simulate the diffusion of pollutants in the contaminated soil under high temperature alone, and can also cooperate with the cooling device to form the diffusion of pollutants in the contaminated soil under the condition of alternating cold and hot cycles, and can also cooperate with the water flow to grasp the effect of the contaminated soil on the diffusion of its pollutants under the combined conditions of high temperature and water flow. Of course, it can also cooperate with the cooling device and the water flow at the same time to analyze the diffusion effect of pollutants in the contaminated soil under the combined conditions of alternating cold and hot cycles and water flow;

[0034] Specifically: a high temperature plate is installed at the bottom of the test tube of the present invention, and an electric heater is installed in the high temperature plate. When the electric heater is powered on, a heating effect can be achieved, so that a fixed heat source temperature can be formed, so that the present invention can simulate the diffusion of pollutants in contaminated soil under high temperature.

[0035] Preferably, two layers of quartz sand are loaded in the test cylinder, and one layer of the quartz sand is located between the contaminated soil and the low-temperature plate, and the other layer of the quartz sand is located between the contaminated soil and the high-temperature plate. At the same time, temperature sensors are embedded in both layers of the quartz sand, and the two temperature sensors are electrically connected to the controller and the display screen in sequence.

[0036] In the present invention, a quartz sand layer is arranged between the contaminated soil and the low-temperature plate, and between the contaminated soil and the high-temperature plate. The quartz sand layer can improve the heat transfer efficiency of the low-temperature plate to the contaminated soil, and the quartz sand layer can improve the heat transfer efficiency of the high-temperature plate to the contaminated soil. At the same time, temperature sensors are embedded in the two quartz sand layers, and the values ​​of the two temperature sensors are controlled by a controller to be displayed on a display screen. Therefore, the temperature affecting the contaminated soil can be reasonably controlled, thereby improving the authenticity of the simulation conditions of the present invention and the accuracy of the simulation results.

[0037] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a pollutant diffusion model device in contaminated soil, which can achieve the following technical effects:

[0038] The present invention places the contaminated soil in a test cylinder. Since a plurality of flow holes are provided on the side wall of the test cylinder, the contaminated soil in the test cylinder can diffuse out through the plurality of flow holes. Therefore, when the valve is opened and the water flow is recorded by a flow meter, the water inlet pipe transports the external water to the corresponding buffer layer and then enters the water flow space through the plurality of water holes on the buffer layer. At the same time, the water in the water flow space can enter the buffer layer near the water outlet pipe through the plurality of water holes near the water outlet pipe and then flow out through the water outlet pipe, so as to ensure that the water can evenly enter the contaminated soil in the test cylinder, so that the contaminated soil in the test cylinder can diffuse out through the flow holes with the water flow. The contaminated soil after the water flow is taken out in layers or zones, and the concentration of pollutants in the contaminated soil after the water flow is tested by a special instrument. Then, the concentration of pollutants in the corresponding contaminated soil under a certain water flow rate (the flow meter records the water flow rate, so the water flow rate can be inferred). That is, the present invention can simulate the diffusion effect of pollutants in the contaminated soil under a certain water flow rate.

[0039] The invention has the advantages of simple structure, convenient operation and labor saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0041] Figure 1 This is a structural diagram of a pollutant diffusion model device in contaminated soil according to the present invention;

[0042] Figure 2 The present invention is a structural diagram of a test tube in a pollutant diffusion model device in contaminated soil.

[0043] Among them, 1-box; 11-buffer layer; 12-water inlet pipe; 13-water outlet pipe; 14-valve; 15-flow meter; 110-water hole; 2-test cylinder; 210-water flow space; 21-contaminated soil; 22-cooling device; 23-heating device; 20-circulation hole; 111-partition; 101-accommodating cavity; 221-low temperature plate; 222-brine input pipe; 223-brine output pipe; 224-brine tank; 231-high temperature plate; 232-electric heater; 24-quartz sand layer; 241-temperature sensor. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] The embodiment of the present invention discloses a pollutant diffusion model device in contaminated soil, comprising:

[0046] Box body 1, buffer layers 11 are arranged on the inner walls of both sides of box body 1, and water inlets and water outlets are connected one by one on the box walls of both sides of box body 1 provided with buffer layers 11, one buffer layer 11 is connected to a water inlet pipe 12 through the corresponding water inlet, and another buffer layer 11 is connected to a water outlet pipe 13 through the corresponding water outlet, and valves 14 and flow meters 15 are installed on the water inlet pipe 12 and the water outlet pipe 13, and multiple water holes 110 are evenly opened on each buffer layer 11;

[0047] The test cylinder 2 is vertically arranged in the box body 1, and defines a water flow space 210 between the inner wall of the box body 1 and the two buffer layers 11 respectively; both ends of the test cylinder 2 are open, and the test cylinder 2 is loaded with contaminated soil 21, and at the same time, a plurality of flow holes 20 are evenly opened on the side wall of the test cylinder 2, and the two open ends of the test cylinder 2 are blocked.

[0048] In order to further optimize the above technical solution, multiple temperature probes and multiple moisture sensors are embedded in the contaminated soil 21, and the multiple temperature probes and multiple moisture sensors are embedded in the contaminated soil 21 at intervals along the central axis of the test tube 2. At the same time, the multiple temperature probes and multiple moisture sensors are electrically connected to the controller and the display screen in turn.

[0049] In order to further optimize the above technical solution, two buffer layers 11 are arranged on two opposite side walls of the box body 1 in a one-to-one correspondence.

[0050] In order to further optimize the above technical solution, the box body 1 is a rectangular parallelepiped, and the buffer layer 11 includes:

[0051] The partition 111 is vertically arranged in the box body 1 close to and parallel to a side wall of the box body 1. At the same time, the two sides of the partition 111 are connected one by one to the two side walls of the box body 1 perpendicular to the partition 111 to define an accommodating cavity 101, and a plurality of water holes 110 are evenly opened on the partition 111.

[0052] In order to further optimize the above technical solution, the buffer layer 11 further includes:

[0053] Granular sand, the granular sand is filled in the receiving cavity 101 .

[0054] In order to further optimize the above technical solution, a filter layer is fixed on one side of the partition 111 close to the test cylinder 2 .

[0055] In order to further optimize the above technical solution, one open end of the test tube 2 is blocked by a cooling device 22, and the cooling device 22 includes:

[0056] A cryopanel 221, the cryopanel 221 covers an open end of the test tube 2, and a first cavity is opened inside the cryopanel 221, and an inlet and an outlet connected to the first cavity are opened on a side surface of the cryopanel 221 away from the test tube 2, the inlet is connected to a saline input pipe 222, and the outlet is connected to a saline output pipe 223;

[0057] The brine tank 224 is loaded with brine, and the temperature of the brine is between minus twenty-five degrees Celsius and minus thirty-five degrees Celsius; the brine input pipe 222 and the brine output pipe 223 are both connected to the brine tank 224, and control valves are installed on the brine input pipe 222 and the brine output pipe 223.

[0058] In order to further optimize the above technical solution, the other open end of the test tube 2 is blocked by a temperature increasing device 23, and the temperature increasing device 23 includes:

[0059] The high temperature plate 231, the high temperature plate 231 and the low temperature plate 221 are opposite to each other and cover the other open end of the test tube 2, and a second cavity is opened in the high temperature plate 231, and a threading hole connected to the second cavity is opened on the side wall of the high temperature plate 231;

[0060] The electric heater 232 is embedded in the second cavity, and the electric heater 232 is connected with a wire, which passes through the wire threading hole and is connected to a power source.

[0061] In order to further optimize the above technical solution, two layers of quartz sand 24 are loaded in the test cylinder 2, and one layer of quartz sand 24 is located between the contaminated soil 21 and the low-temperature plate 221, and the other layer of quartz sand 24 is located between the contaminated soil 21 and the high-temperature plate 231. At the same time, temperature sensors 241 are embedded in the two layers of quartz sand 24, and the two temperature sensors 241 are electrically connected to the controller and the display screen in turn.

[0062] Embodiment 1:

[0063] The embodiment of the present invention discloses a pollutant diffusion model device in contaminated soil, which simulates the effect of pollutant diffusion rate under a certain flow rate, and its working principle is as follows:

[0064] Open the valve 14, and record the water flow rate through the flow meter 15 (the water flow rate can be inferred). Then the water inlet pipe 12 transports the external water to the corresponding receiving cavity 101 formed between the partition 111 and the side wall of the box body 1 for evacuation. The evacuated water flows into the water flow space 210 through the multiple water holes 110 opened on the partition 111. Then the water in the water flow space 210 simultaneously enters the test cylinder 2 through the multiple flow holes 20 opened on the side wall of the test cylinder 2, and flows through the contaminated soil 21 in the test cylinder 2, so that the contaminated soil 21 flowing through the test cylinder 2 enters the water flow space 210 along with the water flow through the multiple flow holes 20. The sewage is then discharged through the outlet pipe 13 (in order to ensure that water enters from the water inlet pipe 12 and exits from the water outlet pipe 13, the end of the box body 1 close to the water inlet pipe 12 can be higher than the end close to the water outlet pipe 13) to the sewage collection box (the outlet pipe 13 is connected to the sewage collection box) to prevent the pollutants in the sewage from causing secondary pollution to the external environment (in order to better prevent the pollution from leaking out, a filter layer can be fixed on one side of the partition 111 close to the test tube 2, so as to keep the polluted impurities in the box body 1);

[0065] After the experiment, the test tube 2 is taken out and each structure is dismantled. The contaminated soil can be taken out in layers and zones and numbered in sequence. The numbered soil is then monitored with a special instrument for the concentration of each pollutant. In combination with the control of the water flow rate, a predetermined flow rate can be achieved. The water flows uniformly through the contaminated soil 21 through the multiple flow holes 20 on the side wall of the test tube 2, which can achieve the effect of simulating the diffusion rate of pollutants under a certain flow rate. By sorting (taking the different water flow rates of multiple experiments as the data of the x-axis, and taking the concentrations of pollutants in the multiple contaminated soils corresponding to the multiple water flow rates as the data of the y-axis), the diffusion of pollutants in the overall contaminated soil with the water flow can be obtained.

[0066] Example 2: Simulating the effect of diffusion law of pollutants in frozen soil and soil at freezing temperature. The working principle is as follows:

[0067] A cryopanel 221 is installed on the top of the test tube of the present invention. The cryopanel 221 is externally connected to a brine input pipe 222 and a brine output pipe 223. At the same time, the brine input pipe 222 and the brine output pipe 223 are both connected to a brine tank 224. Then, when the control valve is opened, a circulation loop is formed by the first cavity provided in the cryopanel 221, the brine input pipe 222, the brine output pipe 223 and the brine tank 224. The brine tank 224 contains low-temperature brine. In this way, a refrigeration circulation system can be formed on the top of the contaminated soil 21, and a continuous cold end temperature can be provided through the cryopanel 221.

[0068] After the experiment, the test cylinder 2 is taken out and all structures are dismantled. The contaminated soil can be taken out in layers and zones and numbered in sequence. The concentration of each pollutant in the numbered soil is then monitored by special instruments. Combined with the cryogenic plate 221 to provide a continuous cold end temperature, the diffusion law of pollutants in the contaminated soil under simulated frozen soil and freezing temperature can be obtained.

[0069] Example 3: Example 3 is a combination of Example 2 and Example 1, so as to understand the effect of the contaminated soil 21 on the diffusion of its pollutants under the combined effects of low temperature and water flow.

[0070] Embodiment 4: Simulating the diffusion of pollutants in soil at high temperature, the working principle is as follows: a high temperature plate 231 is installed at the bottom of the test tube 2 of the present invention, and an electric heater 232 is installed in the high temperature plate 231. When the electric heater 232 is powered on, a heating effect can be achieved, so that a fixed heat source temperature can be formed;

[0071] After the experiment, the test cylinder 2 is taken out and all structures are dismantled. The contaminated soil can be taken out in layers and zones and numbered in sequence. The concentration of each pollutant in the numbered soil is then monitored using a special instrument. Combined with the high temperature plate 231 to provide a continuous heat source temperature, the diffusion of pollutants in the contaminated soil under simulated high temperature can be obtained.

[0072] Example 5: Example 5 is a combination of Example 4 and Example 2, forming the diffusion of pollutants in contaminated soil under the conditions of alternating cold and hot cycles.

[0073] Example 6: Example 6 is a combination of Example 5 and Example 3, which grasps the diffusion effect of pollutants in the contaminated soil under the common conditions of alternating cold and hot cycles and water flow.

[0074] Embodiment 7:

[0075] On the basis of Examples 1-6, multiple temperature probes of the present invention are embedded in the contaminated soil at intervals along the central axis of the test tube 2, and can be displayed on a display screen, thereby simulating the changes in the temperature field inside the contaminated soil under a freeze-thaw environment; and, multiple moisture sensors of the present invention are embedded in the contaminated soil at intervals along the central axis of the test tube 2, and can be displayed on a display screen, thereby simulating the migration of moisture inside the contaminated soil under a freeze-thaw environment, thereby the present invention can provide more accurate test conditions for simulating the diffusion of pollutants in the contaminated soil through multiple temperature probes and multiple moisture sensors.

[0076] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0077] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pollutant diffusion model device in contaminated soil, characterized in that: include: A box body (1), wherein buffer layers (11) are provided on both inner walls of the box body (1), and the box walls of the box body (1) provided with the buffer layers (11) are connected to water inlets and water outlets in a one-to-one correspondence, one of the buffer layers (11) is connected to a water inlet pipe (12) through the corresponding water inlet, and the other of the buffer layers (11) is connected to a water outlet pipe (13) through the corresponding water outlet, and the water inlet pipe (12) and the water outlet pipe (13) are both installed with valves (14) and flow meters (15), and each of the buffer layers (11) is evenly opened with a plurality of water holes (110); the buffer layers (11) include granular sand, and the granular sand is filled in the accommodating cavity (101); A test cylinder (2), the test cylinder (2) being vertically arranged in the box body (1), and defining a water flow space (210) between the inner wall of the box body (1) and the two buffer layers (11); both ends of the test cylinder (2) are open, and the test cylinder (2) is loaded with contaminated soil (21), and a plurality of flow holes (20) are evenly opened on the side wall of the test cylinder (2), and both open ends of the test cylinder (2) are blocked; one open end of the test cylinder (2) is blocked by a cooling device (22), and the other open end is blocked by a heating device (23), The temperature reduction device (22) comprises: a cryopanel (221), the cryopanel (221) covering an open end of the test cylinder (2), a first cavity being provided inside the cryopanel (221), and an inlet and an outlet connected to the first cavity being provided on a side surface of the cryopanel (221) away from the test cylinder (2), the inlet being connected to a saline inlet pipe (222), and the outlet being connected to a saline outlet pipe (223); a brine tank (224), wherein the brine tank (224) is loaded with brine, and the temperature of the brine is between minus twenty-five degrees Celsius and minus thirty-five degrees Celsius; the brine input pipe (222) and the brine output pipe (223) are both connected to the brine tank (224), and control valves are installed on the brine input pipe (222) and the brine output pipe (223); The temperature increasing device (23) comprises: a high temperature plate (231), the high temperature plate (231) and the low temperature plate (221) covering the other open end of the test tube (2) opposite to each other, a second cavity being provided in the high temperature plate (231), and a threading hole connected to the second cavity being provided on a side wall of the high temperature plate (231); An electric heater (232), the electric heater (232) being embedded in the second cavity, and the electric heater (232) being connected to a wire, the wire passing through the wire threading hole being connected to a power source.

2. A pollutant diffusion model device in contaminated soil according to claim 1, characterized in that: A plurality of temperature probes and a plurality of moisture sensors are embedded in the contaminated soil (21), and the plurality of temperature probes and the plurality of moisture sensors are embedded in the contaminated soil (21) at intervals along the central axis of the test cylinder (2), and the plurality of temperature probes and the plurality of moisture sensors are electrically connected to a controller and a display screen in sequence.

3. The pollutant diffusion model device in contaminated soil according to claim 2, characterized in that: The two buffer layers (11) are arranged in a one-to-one correspondence on two opposite side walls of the box body (1).

4. A pollutant diffusion model device in contaminated soil according to claim 3, characterized in that: The box body (1) is a rectangular parallelepiped, and the buffer layer (11) comprises: A partition (111), the partition (111) being arranged vertically in the box body (1) close to and parallel to a side wall of the box body (1), and two sides of the partition (111) being connected one-to-one to two side walls of the box body (1) perpendicular to the partition (111) to define the accommodating cavity (101), and a plurality of water holes (110) being evenly opened on the partition (111).

5. The pollutant diffusion model device in contaminated soil according to claim 4, characterized in that: A filter layer is fixed on a side surface of the partition plate (111) close to the test cylinder (2).

6. The pollutant diffusion model device in contaminated soil according to claim 2, characterized in that: Two layers of quartz sand (24) are respectively loaded in the test cylinder (2), and one layer of the quartz sand (24) is located between the contaminated soil (21) and the low-temperature plate (221), and the other layer of the quartz sand (24) is located between the contaminated soil (21) and the high-temperature plate (231). Temperature sensors (241) are embedded in both layers of the quartz sand (24), and the two temperature sensors (241) are electrically connected to the controller and the display screen in sequence.

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