Measurement Device and Measurement Method for Freezing Displacement of Soil Pollutants

Abstract

The present invention provides a measuring device and a measuring method for freezing and displacing soil pollutants, including a freezing and displacing box body, a single-side refrigeration device, a temperature measuring device, a resistivity testing device and a sampling device. The single-side refrigeration device includes a refrigerator for single-side freezing of contaminated soil placed in the freezing and displacing box body. The temperature measuring device includes a plurality of temperature probes and a plurality of temperature collectors connected to the temperature probes. The plurality of temperature probes are arranged in sequence along the direction away from the refrigerator. The resistivity testing device includes multiple groups of measuring nails and a resistivity tester connected to the multiple groups of measuring nails. The multiple groups of measuring nails are arranged in sequence along the direction away from the refrigerator. The sampling device includes a plurality of negative-pressure sampling bottles, and the negative-pressure sampling bottles are communicated with the inside of the freezing and displacing box body through a conduit. The plurality of negative-pressure sampling bottles are arranged in sequence along the direction away from the refrigerator. The embodiments of the present invention can reduce errors, improve the measurement accuracy, and thus improve the effectiveness of the technology for freezing and displacing pollutants.

Description

Technical Field

[0001] The present invention relates to the field of pollutant treatment, and in particular to a measuring device and a measuring method for freezing and displacing soil pollutants. Background Art

[0002] With the rapid growth of the scale and quantity of nuclear power plants, the amount of radioactive waste generated each year has also become increasingly large. Once the nuclear waste leaks, incalculable losses will be caused to human safety and the economy. Therefore, in order to reduce losses, displacing pollutants in soil has also become one of the problems that need to be solved urgently.

[0003] In related technologies, the methods for purifying pollutants in soil include the electric method, the chemical method, and the freezing method. Among them, the method of freezing and displacing pollutants has received wide attention because of its characteristics such as environmental protection, high efficiency, controllability, and avoidance of secondary pollution. During the unilateral freezing process of the soil, the water in the soil freezes into ice and repels almost all other atoms or molecules, and the excess pollutants will be repelled to the unfrozen soil section in front of the freezing front, thereby realizing the displacement of pollutants. However, most of the measuring devices for freezing and displacing pollution in related technologies only use temperature sensors to monitor the situation of freezing and displacement, and the test results have large errors and low accuracy, thus restricting the effectiveness of the technology of actually applying freezing and displacing pollutants. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a measuring device and a measuring method for freezing and displacing soil pollutants, which can reduce errors, improve measurement accuracy, and thus improve the effectiveness of the technology of freezing and displacing pollutants.

[0005] In a first aspect, an embodiment of the present invention provides a measuring device for freezing and displacing soil pollutants, including a freezing and displacing box body, a unilateral refrigeration device, a temperature measuring device, a resistivity testing device, and a sampling device. The freezing and displacing box body is used for placing contaminated soil; the unilateral refrigeration device includes a refrigerator arranged on one side of the freezing and displacing box body for unilaterally freezing the contaminated soil placed in the freezing and displacing box body; the temperature measuring device includes a plurality of temperature probes arranged on the freezing and displacing box body and a temperature collector connected to the plurality of temperature probes, and the plurality of temperature probes are arranged in sequence along the direction away from the refrigerator; the resistivity testing device includes multiple groups of measuring nails arranged on the freezing and displacing box body and a resistivity tester connected to the multiple groups of measuring nails, and the multiple groups of measuring nails are arranged in sequence along the direction away from the refrigerator; the sampling device includes a plurality of negative pressure sampling bottles arranged on the freezing and displacing box body, the negative pressure sampling bottles are communicated to the inside of the freezing and displacing box body through a conduit, and the plurality of negative pressure sampling bottles are arranged in sequence along the direction away from the refrigerator.

[0006] The measuring device provided by the embodiment of the present invention has at least the following beneficial effects: A freezing displacement box is provided for placing contaminated soil, that is, soil containing pollutants; a single-sided refrigeration device is provided, and the refrigeration machine in the single-sided refrigeration device is used to freeze the contaminated soil in the freezing displacement box on one side; a temperature measuring device and a resistivity testing device are provided. The temperature collector and temperature probe of the temperature measuring device are used to measure the temperature of the contaminated soil in the freezing displacement box, and at the same time, the measuring nails and resistivity tester of the resistivity measuring device are used to measure the resistivity of the contaminated soil in the freezing displacement box. The position and shape of the freezing front can be monitored simultaneously by two means, namely the temperature collector and the resistivity tester, and then the situation of freezing displacement can be judged, which can overcome the problem of insufficient accuracy in judging the position of the freezing front solely relying on the buried temperature sensors in the related art and improve the measurement accuracy; a sampling device is provided, and the negative pressure sampling bottle is connected to the inside of the freezing displacement box through a conduit, which can sample soil samples at different positions, measure the pollutant concentration, and then determine the distribution of pollutants, which can avoid the errors caused by the method of setting multiple parallel samples to complete sampling at different times in the related art and improve the sampling efficiency. Therefore, this embodiment can reduce errors and improve measurement accuracy, thereby improving the effectiveness of the freezing displacement of pollutants technology.

[0007] According to some embodiments of the present invention, the refrigeration machine includes a heat dissipation mesh, a heat conduction copper tube, and a refrigeration aluminum plate. The heat dissipation mesh is connected to the refrigeration aluminum plate through the heat conduction copper tube, and the refrigeration aluminum plate is attached to one side of the freezing displacement box.

[0008] According to some embodiments of the present invention, an S-shaped cooling tube is provided inside the refrigeration aluminum plate.

[0009] According to some embodiments of the present invention, the single-sided refrigeration device further includes a power adapter, a temperature controller, and a temperature sensing probe. The power adapter is connected to the refrigeration machine, the temperature controller is respectively connected to the power adapter and the temperature sensing probe, and the temperature sensing probe is provided on the refrigeration machine.

[0010] According to some embodiments of the present invention, the refrigeration machine is located on the left side surface of the freezing displacement box, and a plurality of temperature test holes are provided on the upper side surface of the freezing displacement box, and the temperature test holes are arranged in sequence along the direction away from the refrigeration machine.

[0011] According to some embodiments of the present invention, there are two rows of the temperature test holes.

[0012] According to some embodiments of the present invention, the refrigerator is located on the left side of the freezing displacement box body, and multiple groups of symmetric resistivity test holes are arranged on the front side and the rear side of the freezing displacement box body, and the multiple groups of resistivity test holes are arranged in sequence along the direction away from the refrigerator.

[0013] According to some embodiments of the present invention, the sampling device further includes a negative pressure pump and a knob valve arranged on the conduit, the negative pressure pump is connected to the negative pressure sampling bottle, and the knob valve controls the conduction of the conduit.

[0014] According to some embodiments of the present invention, each side of the freezing displacement box body includes a heat preservation interlayer, and the upper side of the freezing displacement box body is a detachable top plate.

[0015] In a second aspect, an embodiment of the present invention provides a method for measuring the freezing displacement of soil pollutants, which is applied to the measuring device for freezing and displacing soil pollutants as described in the first aspect embodiment above. The method includes: controlling the single-side refrigeration device to freeze the polluted soil placed in the freezing displacement box body at a first freezing temperature and a first freezing rate; obtaining the temperature measurement data of multiple temperature probes through the temperature acquisition instrument; every first preset time, obtaining the resistivity of the polluted soil at the cross-section positions corresponding to several groups of the measurement nails through the resistivity tester; every second preset time, sampling the polluted soil at multiple different positions of the freezing displacement box body through the negative pressure sampling bottle.

[0016] According to the measurement method provided by the embodiments of the present invention, it has at least the following beneficial effects: a freezing displacement box is provided for placing contaminated soil, that is, soil containing pollutants; a single-sided refrigeration device is provided, and the refrigerator in the single-sided refrigeration device is used to freeze the contaminated soil in the freezing displacement box unidirectionally at a first freezing temperature and a first freezing rate; a temperature measurement device and a resistivity test device are provided. The temperature collector and temperature probe of the temperature measurement device are used to measure the temperature of the contaminated soil in the freezing displacement box in real time. At the same time, every first preset time, the measuring nails and resistivity tester of the resistivity measurement device are used to measure the resistivity of the contaminated soil in the freezing displacement box. The position and shape of the freezing front can be monitored simultaneously by means of the temperature collector and the resistivity tester, so as to judge the situation of freezing displacement, which can overcome the problem of insufficient accuracy in judging the position of the freezing front solely relying on the buried temperature sensor in the related technology and improve the measurement accuracy; a sampling device is provided. The negative pressure sampling bottle is connected to the inside of the freezing displacement box through a conduit. Every second preset time, the contaminated soil at multiple different positions in the freezing displacement box is sampled through the negative pressure sampling bottle, and the pollutant concentration is measured, so as to determine the distribution of pollutants, avoid the errors caused by the method of setting multiple parallel specimens to complete sampling at different times in the related technology, and improve the sampling efficiency. Therefore, this embodiment can reduce errors and improve measurement accuracy, thereby improving the effectiveness of the freezing displacement of pollutants technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The additional aspects and advantages of the present invention will become obvious and easy to understand in the description of the embodiments with reference to the following drawings, where:

[0018] Figure 1 is a schematic diagram of the overall structure of the measurement device provided by the first aspect embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the structure of the refrigeration aluminum plate of the measurement device provided by the first aspect embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the structure of the freezing displacement box of the measurement device provided by the first aspect embodiment of the present invention;

[0021] Figure 4 is a schematic plan view of the layout of the temperature test holes and resistivity test holes of the measurement device provided by the first aspect embodiment of the present invention;

[0022] Figure 5 is a flowchart of the freezing displacement measurement method for soil pollutants provided by the second aspect embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0024] In the description of the present invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0025] In the description of the present invention, the meaning of "several" is one or more, the meaning of "multiple" is two or more, "greater than", "less than", "exceeding", etc. are understood as not including the number itself, and "above", "below", "within", etc. are understood as including the number itself. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, words such as "set", "installed", "connected", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present invention in combination with the specific content of the technical solution.

[0027] The embodiments of the present invention provide a measurement device and a measurement method for freezing and displacing soil pollutants, which can reduce errors, improve measurement accuracy, and thus improve the effectiveness of the technology for freezing and displacing pollutants.

[0028] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0029] As Figure 1As shown in the figure, an embodiment of the first aspect of the present invention provides a measurement device for freezing and displacing soil pollutants, including a freezing and displacing box body 100, a single-sided refrigeration device, a temperature measurement device, a resistivity test device, and a sampling device. The freezing and displacing box body 100 is used to place contaminated soil; the single-sided refrigeration device includes a refrigerator 200 arranged on one side of the freezing and displacing box body 100 for single-sided freezing of the contaminated soil placed in the freezing and displacing box body 100; the temperature measurement device includes a plurality of temperature probes arranged on the freezing and displacing box body 100 and a temperature collector 300 connected to the plurality of temperature probes, and the plurality of temperature probes are arranged in sequence along the direction away from the refrigerator 200; the resistivity test device includes a plurality of groups of measurement nails 130 arranged on the freezing and displacing box body 100 and a resistivity tester 400 connected to the plurality of groups of measurement nails 130, and the plurality of groups of measurement nails 130 are arranged in sequence along the direction away from the refrigerator 200; the sampling device includes a plurality of negative pressure sampling bottles 500 arranged on the freezing and displacing box body 100, and the negative pressure sampling bottles 500 are connected to the inside of the freezing and displacing box body 100 through a conduit 510, and the plurality of negative pressure sampling bottles 500 are arranged in sequence along the direction away from the refrigerator 200.

[0030] In this embodiment, the freezing and displacing box body 100 is provided for placing contaminated soil, that is, soil containing pollutants; the single-sided refrigeration device is provided, and the refrigerator 200 in the single-sided refrigeration device is used for single-sided freezing of the contaminated soil in the freezing and displacing box body 100; the temperature measurement device and the resistivity test device are provided. The temperature collector 300 and the temperature probes of the temperature measurement device are used to measure the temperature of the contaminated soil in the freezing and displacing box body 100, and at the same time, the measurement nails 130 and the resistivity tester 400 of the resistivity measurement device are used to measure the resistivity of the contaminated soil in the freezing and displacing box body 100. The position and shape of the freezing front can be monitored simultaneously by two means of the temperature collector 300 and the resistivity tester 400, and then the situation of freezing and displacement can be judged, which can overcome the problem of insufficient accuracy in judging the position of the freezing front by relying solely on the buried temperature sensors in the related art and improve the measurement accuracy; the sampling device is provided, and the negative pressure sampling bottles 500 are connected to the inside of the freezing and displacing box body 100 through the conduit 510, so that soil samples at different positions can be sampled, the pollutant concentration can be measured, and then the distribution of pollutants can be determined, which can avoid the errors caused by the method of setting multiple parallel specimens to complete sampling at different times in the related art and improve the sampling efficiency. Therefore, this embodiment can reduce errors and improve the measurement accuracy, thereby improving the effectiveness of the technology for freezing and displacing pollutants.

[0031] It should be noted that the contaminated soil in this embodiment refers to soil containing pollutants, the freezing front in this embodiment refers to the movable contact interface between frozen soil and unfrozen soil, and the freezing rate in this embodiment refers to the rate of decreasing from the existing ambient temperature to the target freezing temperature.

[0032] It should be noted that a model tube is provided inside the freezing displacement box body 100 of this embodiment. The model tube is used to place contaminated soil, that is, soil containing pollutants. In this embodiment, a single-sided refrigeration device is arranged on one side of the freezing displacement box body 100, and at the same time, the refrigerator 200 in the single-sided refrigeration device is closely attached to one side of the freezing displacement box body 100, so that the refrigerator 200 in the single-sided refrigeration device can apply low temperature to the contaminated soil in the freezing displacement box body 100, thereby realizing single-sided freezing. A temperature measuring device and a resistivity testing device are provided, and the temperature acquisition instrument 300 and the resistivity tester 400 in the temperature measuring device are used to monitor the contaminated soil in the freezing displacement box body 100, so as to obtain the temperature measurement data and resistivity of the contaminated soil, and then determine the position and shape of the freezing front of the contaminated soil. In this embodiment, two testing methods are simultaneously used to monitor the development process and morphological characteristics of the freezing front, which can improve the accuracy of the measurement results. A sampling device is provided, and the negative pressure sampling bottle 500 is connected to the inside of the freezing displacement box body 100 through a conduit 510, and soil samples at different positions can be sampled through the negative pressure sampling bottle 500, improving the sampling efficiency.

[0033] It should be noted that in this embodiment, multiple temperature probes are arranged in sequence along the direction away from the refrigerator 200, which can realize the temperature measurement of the contaminated soil at different positions in the freezing displacement box body 100; multiple groups of measurement nails 130 are arranged in sequence along the direction away from the refrigerator 200, which can realize the resistivity measurement of the contaminated soil at different positions in the freezing displacement box body 100; multiple negative pressure sampling bottles 500 are arranged in sequence along the direction away from the refrigerator 200, which can realize the sampling of the contaminated soil at different positions in the freezing displacement box body 100.

[0034] It can be understood that in this embodiment, the refrigerator 200 is located on the left side of the freezing displacement box body 100. Taking the refrigerator 200 as a reference, the temperature probes arranged on the upper side of the freezing displacement box body 100 are arranged at equal intervals in sequence from the left side to the right side of the upper side of the freezing displacement box body 100, and the measurement nails 130 arranged on the front and rear sides of the freezing displacement box body 100 are arranged at equal intervals in sequence from the left side to the right side of the front side of the freezing displacement box body 100, and the negative pressure sampling bottles 500 arranged on the bottom of the freezing displacement box body 100 are arranged at equal intervals in sequence from the left side to the right side of the bottom of the freezing displacement box body 100.

[0035] As Figure 1 shown, according to some embodiments of the present invention, the refrigerator 200 includes a heat dissipation mesh 210, a heat conduction copper tube 220, and a refrigeration aluminum plate 230. The heat dissipation mesh 210 is connected to the refrigeration aluminum plate 230 through the heat conduction copper tube 220, and the refrigeration aluminum plate 230 is attached to one side of the freezing displacement box body 100.

[0036] It should be noted that the refrigerating aluminum plate 230 of the refrigerating machine 200 is attached to one side of the freezing and displacement box body 100, capable of applying a temperature to one side of the freezing and displacement box body 100, prompting the temperature of the freezing and displacement box body 100 to drop, and then realizing the unilateral freezing of the soil pollutants inside the freezing and displacement box body 100. In addition, the refrigerating machine 200 connects the heat dissipation mesh 210 and the refrigerating aluminum plate 230 through the heat-conducting copper tube 220, capable of achieving heat dissipation and temperature reduction, and accelerating the freezing rate.

[0037] As Figure 2 shown, according to some embodiments of the present invention, an S-shaped cooling pipe 231 is arranged inside the refrigerating aluminum plate 230.

[0038] It should be noted that the cooling pipe 231 is used for refrigeration. The S-shaped cooling pipes 231 are arranged inside the refrigerating aluminum plate 230, capable of increasing the contact area between the refrigerating aluminum plate 230 and the freezing and displacement box body 100, realizing the low-temperature control of the surface of the refrigerating aluminum plate 230, and thus improving the freezing rate.

[0039] As Figure 1 shown, according to some embodiments of the present invention, the unilateral refrigeration device further includes a power adapter 240, a temperature controller 250, and a temperature sensing probe 260. The power adapter 240 is connected to the refrigerating machine 200, the temperature controller 250 is respectively connected to the power adapter 240 and the temperature sensing probe 260, and the temperature sensing probe 260 is arranged on the refrigerating machine 200.

[0040] It should be noted that in addition to the refrigerating machine 200, the unilateral refrigeration device is also provided with a power adapter 240, a temperature controller 250, and a temperature sensing probe 260. The temperature sensing probe 260 is arranged on the refrigerating aluminum plate 230 of the refrigerating machine 200. The temperature controller 250 can monitor the temperature of the refrigerating aluminum plate 230 through the temperature sensing probe 260, thereby controlling the operation of the power adapter 240, and then realizing the freezing of the contaminated soil placed in the freezing and displacement box body 100 with different freezing parameters.

[0041] Specifically, the freezing parameters in this embodiment include the freezing temperature and the freezing rate.

[0042] As Figure 1 shown, according to some embodiments of the present invention, the refrigerating machine 200 is located on the left side surface of the freezing and displacement box body 100. A plurality of temperature test holes 110 are arranged on the upper side surface of the freezing and displacement box body 100, and the temperature test holes 110 are arranged in sequence along the direction away from the refrigerating machine 200.

[0043] It should be noted that in this embodiment, the temperature probe and the temperature test hole 110 are both arranged on the upper side surface of the freezing displacement box body 100, and the temperature probe corresponds to the temperature test hole 110 one by one. The temperature test hole 110 inserts the temperature probe, and the temperature acquisition instrument 300 can monitor the temperature of the contaminated soil at different positions of the freezing displacement box body 100 through the temperature probe, so as to determine the position and shape of the freezing front of the contaminated soil.

[0044] As Figure 1 and Figure 4 shown, according to some embodiments of the present invention, the temperature test holes 110 are arranged in two rows.

[0045] It should be noted that in this embodiment, the temperature test holes 110 are arranged in two rows. Taking the refrigerator 200 located on the left side surface of the freezing displacement box body 100 as a reference, the temperature test holes 110 are arranged at equal intervals from left to right in the direction away from the refrigerator 200. The two rows of temperature test holes 110 are respectively arranged at the position of half of the side length from the front side surface on the upper side surface of the freezing displacement box body 100 and at the position of one-fourth of the side length from the front side surface on the upper side surface of the freezing displacement box body 100. The freezing rate of the soil is easily affected by the external temperature. The freezing rate of the contaminated soil at the middle position of the freezing displacement box body 100 is faster than that of the contaminated soil at the edge position of the freezing displacement box body 100. Adding the temperature test holes 110 at the position of one-fourth of the side length from the front side surface on the upper side surface of the freezing displacement box body 100 can determine the irregular shape of the freezing front to ensure the accuracy of the measurement results.

[0046] As Figure 1 and Figure 4 shown, according to some embodiments of the present invention, the refrigerator 200 is located on the left side surface of the freezing displacement box body 100, and multiple groups of symmetric resistivity test holes 120 are arranged on the front side surface and the rear side surface of the freezing displacement box body 100, and the multiple groups of resistivity test holes 120 are arranged in sequence in the direction away from the refrigerator 200.

[0047] It should be noted that multiple groups of resistivity test holes 120 are also arranged on the front side surface and the rear side surface of the freezing displacement box body 100 in this embodiment. Taking the refrigerator 200 located on the left side surface of the freezing displacement box body 100 as a reference, the multiple groups of resistivity test holes 120 are arranged at equal intervals from left to right in the direction away from the refrigerator 200. The resistivity test holes 120 are used to insert the measuring pins 130, and the resistivity tester 400 can test the resistivity of the contaminated soil at different cross-section positions through the symmetric measuring pins 130 on the front side surface and the rear side surface of the freezing displacement box body 100, so as to determine the position and shape of the freezing front of the contaminated soil.

[0048] It should be noted that the setting height of the multiple groups of resistivity test holes 120 in this embodiment is half of the height of the freezing displacement box body 100.

[0049] As Figure 1 shown, according to some embodiments of the present invention, the sampling device further includes a negative pressure pump 520 and a knob valve 530 provided on the conduit 510. The negative pressure pump 520 is connected to the negative pressure sampling bottle 500, and the knob valve 530 controls the conduction of the conduit 510.

[0050] It should be noted that the sampling device of this embodiment further includes a negative pressure pump 520 and a knob valve 530 provided on the conduit 510; the negative pressure sampling bottle 500 is connected to the negative pressure pump 520, and can keep the negative pressure sampling bottle 500 always in a negative pressure state; the conduit 510 passes through the sealing plug at the upper end of the negative pressure sampling bottle 500, and the negative pressure sampling bottle 500 is connected to the contaminated soil inside the freeze-displacement box body 100 through the conduit 510 with the knob valve 530. When the knob valve 530 is opened, the suction force generated by the high negative pressure in the negative pressure sampling bottle 500 can suck a certain amount of contaminated soil into the negative pressure sampling bottle 500, thereby completing the sampling of the contaminated soil.

[0051] As Figure 3 shown, according to some embodiments of the present invention, each side of the freeze-displacement box body 100 includes a heat preservation interlayer 130, and the upper side of the freeze-displacement box body 100 is a detachable top plate.

[0052] It should be noted that the heat preservation interlayer 130 inside the freeze-displacement box body 100 can eliminate the thermal influence of the external environmental temperature on each side of the freeze-displacement box body 100, and achieve adiabatic heat preservation. Specifically, the heat preservation interlayer 130 of this embodiment is made of rubber and plastic insulation cotton.

[0053] It should be noted that the upper side of the freeze-displacement box body 100 is a detachable top plate, and the top plate can be disassembled through the sliding groove on the upper boundary of the freeze-displacement box body 100; the upper side is set as a detachable structure, which is beneficial to loading contaminated soil into the freeze-displacement box body 100 for measurement operations.

[0054] As Figure 5 shown, the second aspect of the embodiments of the present invention provides a method for measuring freeze-displacement of soil pollutants, which is applied to the measurement device for freeze-displacing soil pollutants in the first aspect as described above. The method includes but is not limited to steps S510 to S540:

[0055] Step S510: Control the single-side refrigeration device to freeze the contaminated soil placed in the freeze-displacement box body at a first freezing temperature and a first freezing rate;

[0056] It should be noted that the freezing parameters of the temperature controller 250 are set. The temperature controller 250 can control the operation of the power adapter 240 according to the current temperature of the refrigeration aluminum plate 230. When the current temperature of the aluminum plate fails to reach the set freezing parameters, the temperature controller 250 can control the power adapter 240 to start, and then control the refrigerator 200 of the unilateral refrigeration device to operate, so as to freeze the contaminated soil placed in the freezing displacement box 100 at the first freezing temperature and the first freezing rate.

[0057] Step S520: Obtain the temperature measurement data of multiple temperature probes through a temperature acquisition instrument;

[0058] It should be noted that during the freezing displacement of soil pollutants, the temperature acquisition instrument 300 can record in real time the temperature measurement data of the contaminated soil in each temperature test hole 110 to determine the position and shape of the freezing front of the contaminated soil.

[0059] Step S530: Every first preset time, obtain the resistivity of the contaminated soil at the cross-sectional positions corresponding to several groups of measurement nails through a resistivity tester;

[0060] It should be noted that the measurement nails 130 symmetrically arranged at different positions on the front side and the rear side of the freezing displacement box 100 are in a group. The resistivity tester is provided with test clips, and the test clips clamp the measurement nails 130 symmetrically arranged at different positions on the front side and the rear side of the freezing displacement box 100, and can obtain the resistivity of the contaminated soil at the corresponding cross-sectional positions, so as to determine the position and shape of the freezing front of the contaminated soil.

[0061] It should be noted that the first preset time can be adjusted according to the actual situation and is not specifically set here. Specifically, in this embodiment, the first preset time is 30 minutes.

[0062] Step S540: Every second preset time, sample the contaminated soil at multiple different positions of the freezing displacement box through a negative pressure sampling bottle 500.

[0063] It should be noted that the suction force generated by the high negative pressure in the negative pressure sampling bottle 500 can suck a certain amount of soil into the negative pressure sampling bottle 500, and then complete the sampling of the contaminated soil; multiple negative pressure sampling bottles 500 are arranged at the bottom of the freezing displacement box 100 and can sample the contaminated soil at multiple different positions of the freezing displacement box 100.

[0064] It should be noted that the second preset time can be adjusted according to the actual situation and is not specifically set here. Specifically, in this embodiment, the second preset time is 30 minutes.

[0065] In this embodiment, a freezing displacement box 100 is provided for placing contaminated soil, i.e., soil containing pollutants; a single-sided refrigeration device is provided, and the refrigerator 200 in the single-sided refrigeration device is used to freeze the contaminated soil in the freezing displacement box 100 unilaterally at a first freezing temperature and a first freezing rate; a temperature measuring device and a resistivity testing device are provided. The temperature collector 300 and the temperature probe of the temperature measuring device are used to measure the temperature of the contaminated soil in the freezing displacement box 100 in real time. At the same time, every first preset time, the measuring pins 130 and the resistivity tester 400 of the resistivity measuring device are used to measure the resistivity of the contaminated soil in the freezing displacement box 100. The position and shape of the freezing front can be monitored simultaneously by the two means of the temperature collector 300 and the resistivity tester 400, and then the situation of freezing displacement can be judged, which can overcome the problem of insufficient accuracy in judging the position of the freezing front by relying solely on the buried temperature sensors in the related art and improve the measurement accuracy; a sampling device is provided. The negative pressure sampling bottle 500 is connected to the inside of the freezing displacement box 100 through a conduit 510. Every second preset time, the contaminated soil at multiple different positions in the freezing displacement box 100 is sampled through the negative pressure sampling bottle 500, and the pollutant concentration is measured, which can determine the distribution of pollutants and avoid the errors caused by the method of setting multiple parallel specimens to complete sampling at different times in the related art and improve the sampling efficiency. Therefore, this embodiment can reduce errors and improve the measurement accuracy, thereby improving the effectiveness of the freezing displacement of pollutants technology.

[0066] It should be noted that the specific operation method of this embodiment is as follows:

[0067] Dry and crush the soil of the test formation through a 2 mm sieve, mix the soil particles evenly with contaminated solutions with different concentrations (0.5 g / L, 1 g / L, 2 g / L, 3 g / L, 4 g / L, 5 g / L) corresponding to the saturated moisture content, and seal and stand for 24 h. After removing the upper top plate of the freezing displacement box 100, divide the saturated soil samples into 10 equal parts and layer them into the model tube in the freezing displacement box 100. Insert the temperature probe into two rows of reserved temperature test holes 110 at 1 / 4 and 1 / 2 of the side length from the upper side of the freezing displacement box 100, and the insertion depth is 1 / 2 of the soil sample height; symmetrically insert the measuring pins 130 into the resistivity test holes 120 reserved at the 1 / 2 height position of the front and rear sides of the freezing displacement box 100, and the insertion depth is 1 cm; insert the conduit 510 connecting the negative pressure sampling bottle 500 into a row of small holes reserved at 1 / 2 of the side length from the front side of the bottom plate of the freezing displacement box 100, rotate the knob valve 530 on the conduit 510 to the closed state, and turn on the negative pressure pump 520 to make the closed negative pressure sampling bottle 500 in a negative pressure state.

[0068] Set the freezing parameters of the temperature controller 250 (freezing temperatures: -30°C, -20°C, -15°C, -10°C; freezing rates: 0.2°C / h, 0.3°C / h, 0.5°C / h, 1°C / h). Insert the power plug of the power adapter 240 into the socket of the temperature controller 250 to start the operation of the refrigerator 200 in the single-sided refrigeration device. Turn on the temperature acquisition instrument 300 to monitor and record in real time the temperature measurement data at different positions of the soil sample at different times. Turn on the resistivity tester 400, clip the test clips on two symmetric measurement nails 130 at different positions, and test and record the resistivity of the soil sample at different cross-section positions during the single-sided freezing process every 30 minutes. At the same time, turn on the knob valve 530 on the upper part of the sampling negative pressure bottle every 30 minutes to take 3 - 5 g of soil sample for the determination of the pollutant concentration at different positions of the soil sample.

[0069] After the soil sample is completely frozen, unplug the power switch and turn off the single-sided refrigerator 200. Conduct a comprehensive analysis of the temperature measurement data at different positions of the soil sample obtained by the temperature acquisition instrument 300 and the resistivity measurement data at different times obtained by the resistivity acquisition instrument 400 to clarify the development process and morphological characteristics of the freezing front of the contaminated soil over time. Determine the distribution change of pollutants over time based on the pollutant concentration at different positions of the soil sample obtained at different times. Finally, taking time as the intermediate variable, establish the relationship between the development characteristics of the freezing front of the soil sample during the single-sided freezing process and the migration and distribution of pollutants, and further clarify the displacement effect and mechanism of different freezing parameters on pollutants with different concentrations, providing an effective way for the selection and optimization of freezing parameters for the actual application of the freezing displacement pollution method. This embodiment can reduce errors and improve measurement accuracy, thereby improving the effectiveness of the freezing displacement pollutant technology.

[0070] The above has described the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. A measuring device for freezing and displacing soil pollutants, characterized in that, Comprising: A freezing displacement box for placing contaminated soil; A single-sided refrigeration device, including a refrigerator disposed on one side of the freezing displacement box for single-sided freezing of the contaminated soil placed in the freezing displacement box. The refrigerator is located on the left side of the freezing displacement box. The refrigerator includes a heat dissipation mesh, a heat conduction copper tube, and a refrigeration aluminum plate. The heat dissipation mesh is connected to the refrigeration aluminum plate through the heat conduction copper tube, and the refrigeration aluminum plate is attached to one side of the freezing displacement box; A temperature measurement device, including a plurality of temperature probes disposed on the freezing displacement box and a temperature acquisition instrument connected to the plurality of temperature probes. The plurality of temperature probes are arranged in sequence along a direction away from the refrigerator; A resistivity test device, including multiple groups of measurement nails disposed on the freezing displacement box and a resistivity tester connected to the multiple groups of measurement nails. A plurality of groups of symmetric resistivity test holes are provided on the front side and the rear side of the freezing displacement box. The plurality of groups of resistivity test holes and the multiple groups of measurement nails are arranged in sequence along a direction away from the refrigerator; A sampling device, including a plurality of negative pressure sampling bottles disposed on the freezing displacement box. The negative pressure sampling bottles are communicated to the inside of the freezing displacement box through a conduit. The plurality of negative pressure sampling bottles are arranged in sequence along a direction away from the refrigerator.

2. The measuring device according to claim 1, characterized in that, An S-shaped cooling tube is disposed inside the refrigeration aluminum plate.

3. The measuring device according to claim 1, characterized in that, The single-sided refrigeration device further includes a power adapter, a temperature controller, and a temperature sensing probe. The power adapter is connected to the refrigerator. The temperature controller is respectively connected to the power adapter and the temperature sensing probe. The temperature sensing probe is disposed on the refrigerator.

4. The measuring device according to claim 1, characterized in that, The refrigerator is located on the left side of the freezing displacement box. A plurality of temperature test holes are provided on the upper side of the freezing displacement box. The temperature test holes are arranged in sequence along a direction away from the refrigerator.

5. The measuring device according to claim 4, characterized in that, There are two rows of the temperature test holes.

6. The measuring device according to claim 1, characterized in that, The sampling device further includes a negative pressure pump and a knob valve disposed on the conduit. The negative pressure pump is connected to the negative pressure sampling bottle. The knob valve controls the conduction of the conduit.

7. The measuring device according to claim 1, characterized in that Each side of the freezing displacement box includes a heat preservation interlayer. The upper side of the freezing displacement box is a detachable top plate.

8. A measurement method for freeze displacement of soil pollutants, characterized in that, Applied to the measuring device according to any one of claims 1 to 7, the method includes: Controlling the single-sided refrigeration device to freeze the contaminated soil placed in the freezing displacement box at a first freezing temperature and a first freezing rate; Obtaining temperature measurement data of the plurality of temperature probes through the temperature acquisition instrument; Every first preset time, obtaining the resistivity of the contaminated soil at the cross-sectional positions corresponding to several groups of the measurement nails through the resistivity tester; Every second preset time, sampling the contaminated soil at multiple different positions of the freezing displacement box through the negative pressure sampling bottle.

Images