Experimental device for heavy metal adsorption

Abstract

The invention belongs to the technical field of contaminated soil remediation, and particularly discloses an experimental device for heavy metal adsorption, which comprises a base, an experimental bin, a position limiting part and a water flowing part, and the base is provided with a bearing slide rail. The experiment bin comprises a plurality of experiment disc bodies which are sequentially distributed, transfer windows are formed in the side faces, making contact with each other, of every two adjacent experiment disc bodies, the experiment disc bodies are arranged on the bearing sliding rails in a sliding mode and used for containing soil or adsorbates, and the experiment disc bodies containing the adsorbates are adjacent to the experiment disc bodies containing the soil; the water flowing part is used for providing water for the heavy metal contaminated soil. A plurality of experiment disc bodies can be freely arranged and combined by adopting a modularized dynamic experiment platform, adjacent placement of soil and adsorbents is realized, a contact mode of the adsorbents and the soil in an actual pollution scene is simulated, blocking treatment of diatomite on the migration process of heavy metals in the soil can be simulated, diversified research scenes are compatible, and the experiment efficiency is improved. The method is suitable for laboratory mechanism research and engineering application testing.

Description

Technical Field

[0001] The present invention belongs to the technical field of contaminated soil remediation, and particularly relates to an experimental device for heavy metal adsorption. Background Art

[0002] Diatomite is a natural siliceous mineral formed by the deposition of ancient diatom remains, with amorphous silica (SiO2) as the main component, having characteristics such as a porous structure, a high specific surface area (usually 10 - 60 m 2 / g), and a rich surface of silanol groups (-SiOH). The adsorption mechanism of diatomite for heavy metals mainly includes physical adsorption and chemical adsorption: 1) Physical adsorption, relying on the pore interception of its porous structure and surface electrostatic attraction, to enrich heavy metal ions (such as Pb 2+ 、Cd 2+ 、As 3+ etc.); 2) Chemical adsorption, through the ion exchange, complexation or chelation reaction of surface silanol groups with heavy metal ions to form a stable chemical binding state, and even by modification (such as acid treatment, loading metal oxides, etc.) to introduce new adsorption sites (such as Fe-OH, Mn-O groups, etc.), significantly improving the selective adsorption ability for specific heavy metals.

[0003] Currently, there have been some experimental studies to verify the adsorption ability of diatomite and its related adsorbents for heavy metals. For example, the team from Southwest University used microwave and ultrasonic combined with acid modification of diatomite and found that its adsorption capacity for three heavy metals was significantly improved: Pb 2+ (153.2 mg / g), Cu 2+ (118.7 mg / g), Cd 2+(92.5 mg / g). The adsorption effect increases with increasing pH (2-6), temperature (25-45°C) and adsorbent dosage (1-5 g / L). The isothermal adsorption conforms to the Langmuir model, indicating that monolayer chemical adsorption is dominant. This modification method effectively improves the affinity of diatomaceous earth for cationic heavy metals and is suitable for the remediation of acidic contaminated soils. For example, the team of Hunan University of Science and Technology compounded acid / base modified diatomaceous earth with quicklime and hydroxyapatite for soil remediation of non-ferrous metal tailings. The results showed that the mixed curing agent reduced the effective Mn, Pb and Zn in the soil by 46.32%, 47.93% and 10.68%, respectively, and the accumulation of heavy metals in plants was reduced by more than 50%. X-ray diffraction analysis showed that heavy metals were fixed through mechanisms such as ion exchange, surface complexation and phosphate precipitation, significantly reducing their bioavailability. Another example is the Chongqing Jiaotong University team, which combined diatomaceous earth with plant adhesives to develop a "desert soilification" technology in the restoration of mines in Fuling District, which transformed waste residues into arable soil. Experiments showed that the concentration of heavy metal leaching in the improved soil was reduced by 80%, the pH dropped from 10.2 to 7.8, and the rice yield reached 636 kg / mu. This technology has restored more than 500 mu of mines, and the cost is only 1 / 4 of the traditional soil import method.

[0004] Since the migration of heavy metals in soil can occur through spontaneous processes (such as diffusion) and also rely on water flow (such as mass flow), specifically: heavy metal ions in soil pore water are driven by concentration gradients and diffuse from high concentration areas to low concentration areas. This migration does not require macroscopic water flow and is the result of molecular thermal motion. Since the migration rate of spontaneous processes is slow, it mainly affects the distribution of heavy metals at the microscopic scale (such as between soil particles). When water flows in the soil (such as rainfall, irrigation or groundwater movement), the heavy metal ions dissolved in the water migrate with the water flow. This process depends on the macroscopic movement of water. The migration rate of this process is fast and can affect the distribution of heavy metals at a larger spatial scale (such as from the surface soil to the deep layer or water body). If diatomaceous earth is used to adsorb the migrated heavy metals, it can effectively block them during the migration process of heavy metals and achieve governance. At present, this process is in the theoretical stage, so an experimental device is urgently needed to verify the blocking and governance effect of diatomaceous earth on the migration process of heavy metals in soil. Summary of the invention

[0005] In view of the above-mentioned problems, the purpose of the present invention is to provide an experimental device for heavy metal adsorption, which can verify the blocking and control effect of diatomaceous earth on the migration process of heavy metals in soil.

[0006] The technical solution of the present invention is: an experimental device for heavy metal adsorption, comprising a base, an experimental chamber, a position limiting part and a water flow part.

[0007] The base has a carrying slide rail. The experimental chamber includes a plurality of experimental disk bodies arranged in sequence. Transfer windows are provided on the side surfaces where adjacent two experimental disk bodies are in contact. The experimental disk bodies are slidably arranged on the carrying slide rail. The experimental disk bodies are used for placing soil or adsorbents, and the experimental disk body for placing adsorbents is adjacent to the experimental disk body for placing soil. The position limiting part includes a screw rod and a connecting block group. The screw rod is rotatably arranged on the base, and a motor connected to the screw rod is arranged inside the base. The motor is used to drive the screw rod to rotate; there are a plurality of connecting block groups, all of which are threadedly arranged on the screw rod, and the plurality of connecting block groups are respectively in one-to-one correspondence with and movably connected to the experimental disk bodies. The water flow part includes a water storage member and a spraying disk. The water storage member is used to store water sources. The spraying disk is arranged in the experimental disk body for placing heavy metal contaminated soil, is connected to the water storage member, and is used to provide water to the heavy metal contaminated soil.

[0008] The modular dynamic experimental platform can be flexibly combined for experiments according to actual needs. Among them, a plurality of experimental disk bodies can be freely arranged and combined to realize adjacent placement of soil and adsorbents, simulate the contact mode between the adsorbent and the soil in the actual pollution scenario, and effectively improve the universality of the experiment. The transfer window is used to realize the ion migration between the soil and the adsorbent in the experiment.

[0009] Further, the experimental disk body includes a first disk body and a second disk body. The first disk body has a first placement cavity, and the first placement groove is used for placing soil. The second disk body has a second placement cavity, and the second placement groove is used for placing adsorbents. Different experimental disk bodies are used to separately package the soil and the adsorbents, which is convenient for identification in actual use, convenient for quick packaging, and reduces the operation time. In addition, since the amounts of soil and adsorbents required in the experiment are different, that is, the width of the soil required in the experiment is much larger than the width of the adsorbent. If the same specification of experimental disk body is used, on the basis of meeting the required amount of soil, the amount of adsorbent used will exceed the required amount, resulting in great waste. Therefore, using different specifications of experimental disk bodies, that is, the first disk body and the second disk body, to separately package the soil and the adsorbents can effectively avoid experimental waste. Select the appropriate disk body according to the experimental purpose in actual use, which can not only improve the experimental efficiency but also ensure the reliability of the data. If further optimization is needed, the packaging plan can be refined in combination with specific experimental conditions.

[0010] Even further, both the first placement cavity and the second placement cavity are of cuboid structure, the lengths and heights of the first placement cavity and the second placement cavity are the same, and the ratio of the width of the first placement cavity to the width of the second placement cavity is 5 - 15:1.

[0011] Furthermore, a transverse groove is provided along the length direction of the upper end of the first placement cavity. The spray tray is in a strip structure and is clamped inside the transverse groove. The strip structure is clamped into the transverse groove to achieve full coverage of water supply on the soil surface, simulating natural precipitation or irrigation conditions. The transverse groove extends along the length direction of the first placement cavity. After the spray tray is clamped in, a continuous strip structure is formed, which can evenly distribute water along the entire length of the soil surface, avoiding local drought or waterlogging and simulating the uniformity of natural precipitation. The slot design of the transverse groove can limit the displacement of the spray tray, avoiding position deviation caused by water flow impact or external force touch and ensuring the stability of water supply. Moreover, by replacing the spray tray with different pore diameters or water outlet densities, the water supply volume or water droplet size can be flexibly adjusted to meet different experimental scenarios such as soil infiltration and leaching.

[0012] Furthermore, the water flow part further includes a liquid distribution part, and the liquid distribution part includes a main pipe, a liquid distribution connector, and branch pipes. The main pipe is arranged on the base, and the main pipe is connected to the water storage member through a pump body. There are multiple liquid distribution connectors, and the multiple liquid distribution connectors are arranged on the main pipe in sequence. A valve is arranged on the liquid distribution connector. One end of the branch pipe is connected to the liquid distribution connector, and the other end is connected to the spray tray. The design of the branch pipe and the valve can independently control the water supply volume of each spray tray to meet the different humidity requirements of different experiments.

[0013] Further, a sealing strip is arranged at the periphery of the transfer window to improve the sealing effect and avoid the problem of inaccurate experiments caused by leakage when water flows through the transfer window.

[0014] Further, the connection block group includes a movable nut, a connection block, and a limiting rod.

[0015] The movable nut is threadedly arranged on the driving screw rod. The connection block is sleeved outside the movable nut and is rotatably connected to the movable nut; a clamping block is arranged on the experimental disk body, and the connection block and the clamping block are clamped through a locking block. One end of the limiting rod is arranged on the connection block, and the other end is movably arranged on the movable nut and is used for locking the movable nut; when the limiting rod locks the movable nut, the screw rod rotates and drives the movable nut to move, and further drives the experimental disk body clamped on the connection block to move.

[0016] Further, a grid is arranged on the transfer window.

[0017] The sealing strip and the grid cooperate to not only prevent leakage but also control the ion migration rate between the soil and the adsorbent through the grid, avoiding the problems of "overmixing" or "insufficient contact" in traditional experiments.

[0018] Further, a compaction part is further included, and the compaction part is used for compacting the heavy metal contaminated soil.

[0019] Furthermore, the compaction part includes a guide rail, a mounting rack, a telescopic member, and a pressing plate. The guide rail is arranged on the base, the mounting rack is slidably arranged on the guide rail along the length of the guide rail, the telescopic member is arranged on the mounting rack, the pressing plate is arranged at the telescopic end of the telescopic member, and when the telescopic member extends, the pressing plate is used to compact the heavy metal contaminated soil in the experimental disc body.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adopts a modular dynamic experimental platform, in which multiple experimental disc bodies can be freely arranged and combined to realize the adjacent placement of soil-adsorbent, simulate the contact mode between the adsorbent and the soil in the actual pollution scenario, can simulate the blocking treatment of the migration process of heavy metals in the soil by diatomite, is compatible with diversified research scenarios, and is applicable to laboratory mechanism research and engineering application tests.

[0021] Among them, after adjusting the experimental disc body according to the requirements of the actual research scenario, the position limiting part can be used to effectively limit the experimental disc body, so as to ensure the formation of a directional migration channel between adjacent experimental disc bodies based on the transfer window, and further verify the migration process. The position limiting part can ensure the installation stability of each experimental disc body.

[0022] Among them, the water flow part realizes full coverage water supply on the soil surface based on the microporous spraying system, simulates natural precipitation or irrigation conditions, and studies the blocking treatment effect of diatomite on the migration of heavy metals in the soil under macroscopic water flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the overall structural schematic diagram of Embodiment 1 of the present invention; Figure 2 is the structural schematic diagram of the first disc body of the present invention; Figure 3 is the exploded view of the structure of the second disc body of the present invention; Figure 4 is the present invention Figure 1 enlarged view at A in; Figure 5 is the structural schematic diagram of Embodiment 2 of the present invention.

[0024] Among them, 1-base, 10-bearing slide rail, 2-experimental chamber, 20-experimental disc body, 200-transfer window, 21-first disc body, 210-first placement cavity, 2100-horizontal groove, 22-second disc body, 220-second placement cavity, 3-position limiting part, 31-screw rod, 32-connecting block group, 321-moving nut, 322-connecting block, 323-limiting rod, 4-water flow part, 40-spraying disc, 41-main pipe, 42-liquid separation connector, 43-branch pipe, 5-compaction part, 51-guide rail, 52-mounting rack, 53-telescopic member, 54-pressing plate. Detailed implementation manners

[0025] The following will combine with Figures 1 to 5 to describe the detailed implementation manners of the present invention in detail. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the 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 cannot be understood as a limitation to the present invention.

[0026] The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features; in the description of the present invention, unless otherwise stated, the meaning of "plurality" is two or more.

[0027] It should be noted that the circuit connections involved in the present invention all adopt conventional circuit connection methods and do not involve any innovation.

[0028] Embodiment 1 As Figure 1 shown, an experimental device for heavy metal adsorption includes a base 1, an experimental chamber 2, a position limiting part 3, and a moisture flow part 4. The base 1 has a carrying slide rail 10.

[0029] The experimental chamber 2 includes a plurality of experimental disk bodies 20 distributed in sequence. Transfer windows 200 are provided on the side surfaces where adjacent two experimental disk bodies 20 contact. The experimental disk bodies 20 are slidably arranged on the carrying slide rail 10. The experimental disk bodies 20 are used for placing soil or adsorbents. The experimental disk body 20 for placing adsorbents is adjacent to the experimental disk body 20 for placing soil; the soil is ordinary soil or heavy metal contaminated soil, and the adsorbent is a diatomite adsorbent.

[0030] The position limiting part 3 includes a screw rod 31 and a connecting block group 32. The screw rod 31 is rotatably arranged on the base 1. A motor connected to the screw rod 31 is provided inside the base 1, and the motor is used to drive the screw rod 31 to rotate; there are a plurality of connecting block groups 32, all of which are threadedly arranged on the screw rod 31, and the plurality of connecting block groups 32 are respectively in one-to-one correspondence with and movably connected to the experimental disk bodies 20. The moisture flow part 4 includes a water storage member and a spray tray 40. The water storage member is used to store water source. The spray tray 40 is arranged in the experimental disk body 20 for placing heavy metal contaminated soil, is connected to the water storage member, and is used to provide moisture to the heavy metal contaminated soil.

[0031] As Figure 1As shown, the base 1 is an experimental platform with a concave cross-section. The two sides and the bottom of the concave structure of the base 1 are all hollow structures to facilitate the placement of other components.

[0032] Among them, there are two load-bearing sliding rails 10, which are arranged in parallel in the concave structure of the base 1. There are two screw rods 31, which span between the two sides of the concave structure of the base 1 and are located above the load-bearing sliding rails 10. The load-bearing sliding rails 10 are parallel to the screw rods 31. The position limiting part 3 and the load-bearing sliding rails 10 form a load-bearing limiting structure. The two load-bearing sliding rails 10 are used to support the bottom of the experimental disc body 20, and the two screw rods 31 are used to limit the two opposite side surfaces of the experimental disc body 20 in contact with the transfer window 200. The experimental disc body 20 is fixed by the connecting block group 32, so that the experimental disc body 20 can be stably placed in the space formed by the two load-bearing sliding rails 10 and the two screw rods 31 and move along with the connecting block group 32 on the load-bearing sliding rails 10.

[0033] In this embodiment, the modular dynamic experimental platform can be flexibly combined according to actual needs. Among them, multiple experimental disc bodies 20 can be freely arranged and combined to realize the adjacent placement of soil-adsorbent, simulate the contact mode of adsorbent and soil in the actual pollution scenario, and effectively improve the universality of the experiment. The transfer window 200 is used to realize the ion migration between soil and adsorbent in the experiment.

[0034] When in use, soil or adsorbent can be selectively placed in the experimental disc body 20 to realize the simulation of modular dynamic experiments.

[0035] For example, when using 5 experimental disc bodies 20 for experiments, the experimental disc bodies 20 are, from left to right, experimental disc body one, experimental disc body two, experimental disc body three, experimental disc body four, and experimental disc body five. Heavy metal contaminated soil is placed in experimental disc body three, ordinary soil is placed in experimental disc body one and experimental disc body four, and adsorbents are placed in experimental disc body two and experimental disc body five.

[0036] Among them, the heavy metal contaminated soil in this embodiment is heavy metal contaminated soil containing Pb 2+ , Zn 2+ . Specifically, it is prepared by mixing Pb(NO3) 2 , Zn(NO3) 2 ·6H2O to prepare a solution with a concentration of 1000 mg / L of Pb 2+ , Zn 2+ and diluting it and mixing it evenly with ordinary soil. It should be noted that: the heavy metal contaminated soil can also be other heavy metal contaminated soils, which are selectively prepared according to needs.

[0037] Among them, the adsorbent in this embodiment is a diatomite adsorbent, and the diatomite adsorbent is specifically refined diatomite soil obtained by refining diatomite as a raw material. It should be noted that the diatomite adsorbent can also be modified diatomite, which is selectively prepared according to requirements.

[0038] During the experiment, the natural precipitation or irrigation environment was simulated in the third experimental disk body through the water flow part 4. Subsequently, samples were periodically taken from the first, second, third, fourth, and fifth experimental disk bodies, and then the mass concentration of heavy metal ions contained in the corresponding samples collected from different experimental disk bodies was calculated. The specific calculation method was determined by flame atomic absorption spectrophotometry. By comparing the mass concentration of heavy metal ions contained in the corresponding samples of different experimental disk bodies, the blocking and treatment effect of diatomite in the migration of heavy metals in soil under macroscopic water flow was evaluated, as shown in Table 1 specifically:

[0039] Table 1 Evaluation table for the blocking and treatment effect of diatomite in the migration of heavy metals in soil under macroscopic water flow It should be noted that during sampling, samples should be taken as much as possible from the center between the two opposite sides of the transfer window 200 provided on the experimental disk body 20, and the sampling tube is vertically inserted from above the experimental disk body 20 for sampling. That is, sampling is avoided close to the transfer window 200, mainly because the soil or adsorbent near the transfer window 200 will move with the water, avoiding interference of this part of the moving substances with the experimental data.

[0040] In addition, a sealing plate is provided on the exposed transfer window 200 of the experimental disk body 20 at the end, that is, a sealing plate is provided on the transfer window 200 on the left side of the first experimental disk body and the transfer window 200 on the right side of the fifth experimental disk body to seal the experimental chamber 2 and prevent the leakage of heavy metal pollutants.

[0041] Preferably, as Figure 2 、 Figure 3 shown, the experimental disk body 20 includes a first disk body 21 and a second disk body 22. As Figure 2 shown, the first disk body 21 has a first placement cavity 210, and the first placement groove 210 is used for placing soil. As Figure 3As shown, the second disk body 22 has a second placement cavity 220 for placing adsorbents. Different experimental disk bodies 20 are used to separately pack the soil and the adsorbents, which is convenient for identification in actual use, facilitates rapid packing, and reduces operation time. In addition, since the amounts of soil and adsorbents required in the experiment are different, that is, the width of the soil required in the experiment is much larger than the width of the adsorbent. If the same specification of experimental disk body 20 is used, the amount of adsorbent used will exceed the required amount on the basis of meeting the required amount of soil, resulting in great waste. Therefore, different specifications of experimental disk bodies 20, namely the first disk body 21 and the second disk body 22, are used to separately pack the soil and the adsorbents, which can effectively avoid experimental waste. Selecting a suitable disk body according to the experimental purpose in actual use can not only improve the experimental efficiency but also ensure the reliability of data. If further optimization is required, the packing scheme can be refined in combination with specific experimental conditions such as humidity and detection methods. It should be noted that: the upper parts of the first placement cavity 210 and the second placement cavity 220 are both open, and a cover is clamped at the opening of the second placement cavity 220.

[0042] Preferably, both the first placement cavity 210 and the second placement cavity 220 are of a cuboid structure. The lengths and heights of the first placement cavity 210 and the second placement cavity 220 are the same, and the ratio of the width of the first placement cavity 210 to the width of the second placement cavity 220 is 5 - 15:1.

[0043] Preferably, a transverse groove 2100 is provided along the length direction of the upper end of the first placement cavity 210. The spray disk 40 is of a strip structure and is clamped inside the transverse groove 2100. The strip structure is clamped into the transverse groove 2100 to achieve full coverage of water supply on the soil surface, simulating natural precipitation or irrigation conditions. The transverse groove extends along the length direction of the first placement cavity 210. After the spray disk is clamped, a continuous strip structure is formed, which can evenly distribute water along the entire length of the soil surface, avoiding local drought or waterlogging and simulating the uniformity of natural precipitation. The slot design of the transverse groove 2100 can limit the displacement of the spray disk, avoiding position deviation caused by water flow impact or external force touch and ensuring the stability of water supply. Moreover, by replacing the spray disk with different pore sizes or water outlet densities, the water supply amount or the size of water droplets can be flexibly adjusted to meet different experimental scenarios such as soil infiltration and leaching.

[0044] Preferably, the water flow part 4 further includes a liquid separation part. The liquid separation part includes a main pipe 41, a liquid separation connector 42, and a branch pipe 43. The main pipe 41 is arranged on the base 1, and the main pipe 41 is connected to the water storage member through a pump body. There are multiple liquid separation connectors 42, and the multiple liquid separation connectors 42 are arranged on the main pipe 41 in sequence. A valve is arranged on the liquid separation connector 42. One end of the branch pipe 43 is connected to the liquid separation connector 42, and the other end is connected to the spray disk 40.

[0045] Preferably, a sealing strip is provided at the periphery of the transfer window 200.

[0046] Preferably, as Figure 4 shown, the connecting block group 32 includes a moving nut 321, a connecting block 322, and a limiting rod 323. The moving nut 321 is threadedly arranged on the driving screw 31. The connecting block 322 is sleeved outside the moving nut 321 and is rotatably connected to the moving nut 321; a clamping block is arranged on the experimental disk body 20, and the connecting block 322 and the clamping block are clamped by a locking block. One end of the limiting rod 323 is arranged on the connecting block 322, and the other end is movably arranged on the moving nut 321 for locking the moving nut 321; when the limiting rod 323 locks the moving nut 321, the screw 31 rotates and drives the moving nut 321 to move, thereby driving the experimental disk body 20 clamped on the connecting block 322 to move.

[0047] Preferably, a grid is arranged on the transfer window 200. The grid can effectively block solid soil and adsorbents, avoiding the problem that moisture carries soil or adsorbents when passing through the transfer window 200, resulting in inaccurate experimental data. By cooperating with the sealing strip and the grid, it not only prevents leakage but also controls the ion migration rate between the soil and the adsorbent through the grid, avoiding the problems of "overmixing" or "insufficient contact" in traditional experiments.

[0048] Example 2 Different from Example 1: As Figure 5 shown, an experimental device for heavy metal adsorption further includes a compaction part 5, and the compaction part 5 is used for compacting heavy metal contaminated soil.

[0049] Preferably, the compaction part 5 includes a guide rail 51, a mounting frame 52, a telescopic member 53, and a pressing plate 54. The guide rail 51 is arranged on the base 1, the mounting frame 52 is slidably arranged on the guide rail 51 along the length of the guide rail 51, the telescopic member 53 is arranged on the mounting frame 52, and the pressing plate 54 is arranged at the telescopic end of the telescopic member 53. When the telescopic member 53 extends, the pressing plate 54 is used for compacting the heavy metal contaminated soil in the experimental disk body 20.

[0050] In actual use, using the compaction part 5 to compact the heavy metal contaminated soil in the experimental disk body 20 can make the soil particles arranged more closely and reduce the pore volume. For example, the porosity of sandy soil can be reduced from 40% to 25% after compaction, and that of clay can be reduced from 50% to 35%. And the pore types in the soil change, specifically: the large pores > 50μm decrease, the micro pores < 5μm relatively increase, and the proportion of capillary pores rises. Therefore, during the experiment, by compacting the soil pores, the content of soil pore water can be changed, so as to verify the spontaneous process of heavy metal migration under different soil porosity conditions. During the experiment, the flow of moisture inside the soil can also be accelerated by compacting the soil, that is, squeezing the soil to make the moisture pass through the transfer window 200.

[0051] No special designation is made for the specific models of the above-mentioned electronic components, and ordinary commercially available products can be selected as long as they can meet the usage requirements of the present invention.

[0052] The above specific embodiments have further detailed the object, technical solution and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention are all included within the protection scope of the present invention.

Claims

1. An experimental device for heavy metal adsorption, characterized in that, Comprising: A base (1) having a carrying slide rail (10); An experimental chamber (2) including a plurality of sequentially distributed experimental plates (20). Transfer windows (200) are provided on the side surfaces where adjacent two experimental plates (20) are in contact. The experimental plates (20) are slidably arranged on the carrying slide rail (10). The experimental plates (20) are used for placing soil or adsorbents, and the experimental plates (20) for placing adsorbents are adjacent to the experimental plates (20) for placing soil; A position limiting part (3) including: a screw rod (31) rotatably arranged on the base (1), and a motor connected to the screw rod (31) is provided inside the base (1), and the motor is used to drive the screw rod (31) to rotate; a plurality of connecting block groups (32) are all threadedly arranged on the screw rod (31), and the plurality of connecting block groups (32) are respectively in one-to-one correspondence with and movably connected to the experimental plates (20); A water flow part (4) including: a water storage member for storing water source; a spray tray (40) arranged in the experimental plate (20) for placing heavy metal contaminated soil, connected to the water storage member, and used to supply water to the heavy metal contaminated soil.

2. The experimental device for heavy metal adsorption according to claim 1, wherein, The experimental plate (20) includes: A first plate body (21) having a first placement cavity (210), and the first placement groove (210) is used for placing soil; A second plate body (22) having a second placement cavity (220), and the second placement groove (220) is used for placing adsorbents.

3. The experimental device for heavy metal adsorption according to claim 2, characterized in that, Both the first placement cavity (210) and the second placement cavity (220) are in a cuboid structure. The lengths and heights of the first placement cavity (210) and the second placement cavity (220) are the same, and the ratio of the width of the first placement cavity (210) to the width of the second placement cavity (220) is 5 - 15:

1.

4. The experimental device for heavy metal adsorption according to claim 2, characterized in that, A transverse groove (2100) is arranged along the length direction of the upper end of the first placement cavity (210), and the spray tray (40) is in a strip structure and is clamped inside the transverse groove (2100).

5. An experimental device for heavy metal adsorption according to claim 3, characterized in that, The water flow part (4) further includes a liquid separation part, and the liquid separation part includes: A main pipe (41) arranged on the base (1), and the main pipe (41) is connected to the water storage member through a pump body; A plurality of liquid separation connectors (42) are sequentially arranged on the main pipe (41), and valves are arranged on the liquid separation connectors (42); A branch pipe (43) with one end connected to the liquid separation connector (42) and the other end connected to the spray tray (40).

6. The experimental device for heavy metal adsorption according to claim 1, characterized in that, A sealing strip is arranged at the periphery of the transfer window (200).

7. The experimental device for heavy metal adsorption according to claim 1, characterized in that, The connecting block group (32) includes: A moving nut (321) threadedly arranged on the driving screw rod (31); A connecting block (322) sleeved outside the moving nut (321) and rotatably connected to the moving nut (321); a clamping block is arranged on the experimental plate (20), and the connecting block (322) and the clamping block are clamped through a locking block; The limit rod (323) has one end set on the connecting block (322) and the other end movably set on the moving nut (321) for locking the moving nut (321); when the limit rod (323) locks the moving nut (321), the screw rod (31) rotates to drive the moving nut (321) to move, and further drives the experimental disc body (20) clamped on the connecting block (322) to move.

8. The experimental device for heavy metal adsorption according to claim 1, wherein, The transfer window (200) is provided with a grid.

9. The experimental device for heavy metal adsorption according to claim 1, characterized in that, It further includes a compaction part (5), and the compaction part (5) is used for compacting the heavy metal contaminated soil.

10. An experimental device for heavy metal adsorption according to claim 9, characterized in that, The compaction part (5) includes: The guide rail (51) is set on the base (1); The mounting frame (52) is slidably arranged along the length of the guide rail (51) on the guide rail (51); The telescopic part (53) is set on the mounting frame (52); The pressing plate (54) is set at the telescopic end of the telescopic part (53). When the telescopic part (53) extends, the pressing plate (54) is used for compacting the heavy metal contaminated soil in the experimental disc body (20).

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