Universal simulation experiment platform for vertical migration of soil pollutants

Abstract

The utility model provides a universal simulation experiment platform for vertical migration of soil pollutants, which comprises a bearing device, a leaching simulation device, a migration simulation device and a collecting device, the leaching simulation device and the migration simulation device are arranged on the bearing device, and the collecting device is used for collecting percolate generated by the migration simulation device. The migration simulation device adopts a modular design and can be flexibly assembled according to experimental requirements, the modular design also reduces the sampling difficulty in the later stage, the flow of a leaching solution is controlled through the peristaltic pump, the flow balance is realized inside and outside the migration device, the natural leaching condition is simulated, and the experimental efficiency is improved. The device integrates the functions of bearing, leaching, migration and collection, is convenient to operate, saves space, is convenient for leachate and sampling, and can dynamically monitor and analyze the migration process and result of pollutants.

Description

Technical Field

[0001] The utility model belongs to the technical field of vertical migration of soil pollutants, and specifically relates to a universal simulation experimental platform for vertical migration of soil pollutants. Background Art

[0002] With the advancement of industrialization and urbanization, various pollutants (such as heavy metals, organic pollutants, and micro-nano plastics) have entered the soil and groundwater environment through various pathways, posing a serious threat to the ecosystem and human health.

[0003] Studying the migration behavior of pollutants in porous media (such as soil, rock, and river sand) is crucial for assessing pollution risks, developing remediation strategies, and protecting groundwater resources. Laboratory column simulation testing is one of the main methods for studying this field. It can simulate the transport process of pollutants in porous media under controlled conditions, thereby deeply exploring the various factors that affect the migration of pollutants.

[0004] Laboratory column simulation testing is a key means to study the migration behavior of pollutants in porous media, and plays an irreplaceable role in protecting soil and groundwater resources, maintaining ecological environmental safety and public health.

[0005] The current laboratory column simulation test device still has some shortcomings: it cannot be highly adjusted according to different pollutants and medium characteristics, and its flexibility and applicability are poor; there is boundary effect interference; the loading, leaching, migration, and collection links are all scattered, the operation is cumbersome, it takes up a lot of space, and there is a risk of pollution. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a universal simulation experimental platform for the vertical migration of soil pollutants in view of the deficiencies of the above-mentioned prior art. The universal simulation experimental platform has a simple structure, is easy to use, is reusable, easy to install and recycle, has good experimental effects, and can be promoted and applied.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: a universal simulation experimental platform for vertical migration of soil pollutants, characterized in that it includes a carrying device, a leaching simulation device, a migration simulation device and a collecting device.

[0008] The carrying device includes a first bottom plate, four supporting columns are fixedly installed on the first bottom plate, a second bottom plate is fixedly installed in the middle of the supporting columns, a rectangular hole is opened at the center of the first bottom plate and the second bottom plate, four supporting legs are arranged in the rectangular hole, a tray is fixedly installed on the top of the supporting legs, and the leaching simulation device is located on the tray.

[0009] The leaching simulation device comprises a water tank, a peristaltic pump, a silicone tube and a nozzle. The top of the water tank is provided with a connecting hole for connecting the silicone tube, and the end of the silicone tube is fixedly connected to the nozzle.

[0010] The migration simulation device is made of a plurality of stacked cylinders, which are fixedly connected by flange buckles. A silicone gasket is arranged inside the flange buckle. The nozzle is located directly above the cylinders in the uppermost layer. The bottom end of the cylinder at the lowest end is sealed. A drainage hole is arranged at the side end of the bottom of the cylinder at the lowest end. The cylinder is filled with a simulation medium.

[0011] The collecting device comprises a plurality of glass dishes, and the glass dishes are used to collect the leachate discharged from the migration simulation device.

[0012] Preferably, the supporting device is made of stainless steel, the first bottom plate is 140 cm long and 90 cm wide, the support column is 5 cm in diameter and 70 cm high, a detachable guardrail is fixedly installed between the support columns, the second bottom plate is 120 cm long and 60 cm wide, the spacing between the first bottom plate and the second bottom plate is 20 cm, and the rectangular hole is 40 cm long and 24 cm wide.

[0013] Preferably, blockable rollers are fixedly connected to the four end corners of the bottom end of the first bottom plate, and the first bottom plate is 20 cm from the ground.

[0014] Preferably, the water tank is a 25L glass cold water bottle, the connection hole has a diameter of 3 cm, the tray is 40 cm long, 24 cm wide, and 5 cm deep, the tray is 110 cm from the ground, and the legs are fixedly connected to the bottom of the tray at an angle.

[0015] Preferably, the adjustable flow range of the peristaltic pump is 0.005 mL / min to 47.4 mL / min, and the inner diameter of the silicone tube is 2.16 mm.

[0016] Preferably, the inner diameter of the cylinder is 10 cm, the wall thickness is 0.5 cm, the height is 10 cm, 15 cm or 20 cm, the diameter of the drainage hole is 5 mm, a drainage pipe is inserted in the drainage hole, and a control valve is provided on the drainage pipe.

[0017] Compared with the prior art, the utility model has the following advantages:

[0018] 1. The utility model adopts stainless steel to make the carrying device, and uses glass material for migration simulation device and collection device to carry out simulation experiments, thus avoiding the contamination of simulation medium and leaching solution, and can simulate the migration behavior of various soil pollutants, such as heavy metals, organic pollutants, micro-nano plastics, etc.

[0019] 2. The migration simulation device in the utility model adopts a modular design and can be flexibly assembled according to experimental requirements. The modular design also reduces the difficulty of later sampling. The migration simulation device adopts a circular columnar structure and is symmetrical in the radial direction, avoiding interference from boundary effects and being closer to actual conditions.

[0020] 3. The utility model controls the flow of the leaching solution through a peristaltic pump and achieves flow balance inside and outside the migration device, simulating natural leaching conditions, integrating the carrying, leaching, migration and collection functions in one, is easy to operate, saves space, and is convenient for leachate and sampling. The migration process and results of pollutants can be dynamically monitored and analyzed.

[0021] The utility model is further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2 It is a three-dimensional structural schematic diagram of the carrying device in the utility model.

[0024] Figure 3 It is a structural schematic diagram of the first bottom plate in the utility model.

[0025] Figure 4 It is a structural schematic diagram of the second bottom plate in the utility model.

[0026] Figure 5 It is a three-dimensional structural schematic diagram of the supporting legs and the tray in the utility model.

[0027] Description of reference numerals:

[0028] 1—carrying device; 101—first bottom plate; 102—support column;

[0029] 103—second bottom plate; 104—rectangular hole; 105—supporting leg;

[0030] 106—tray; 2—leaching simulation device; 201—water tank;

[0031] 202—peristaltic pump; 203—silicone tube; 204—sprinkler;

[0032] 3—migration simulation device; 301—cylinder; 302—flange;

[0033] 4—collecting device; 401—collecting dish. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation of the utility model is described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0036] like Figures 1 to 5 As shown, the utility model provides a universal simulation experimental platform for vertical migration of soil pollutants, including a carrying device 1, a leaching simulation device 2, a migration simulation device 3 and a collecting device 4.

[0037] The carrying device 1 includes a first base plate 101, on which four support columns 102 are fixedly installed, and a second base plate 103 is fixedly installed in the middle of the support columns 102. A rectangular hole 104 is opened at the center of the first base plate 101 and the second base plate 103, and four supporting legs 105 are arranged in the rectangular hole 104. A tray 106 is fixedly installed on the top of the supporting legs 105, and the leaching simulation device 2 is located on the tray 106.

[0038] The leaching simulation device 2 includes a water tank 201 , a peristaltic pump 202 , a silicone tube 203 and a nozzle 204 . A connection hole for connecting the silicone tube 203 is provided at the top of the water tank 201 , and the end of the silicone tube 203 is fixedly connected to the nozzle 204 .

[0039] The migration simulation device 3 is made of a plurality of stacked cylinders 301, and the cylinders 301 are fixedly connected by flange buckles 302, and a silicone gasket is arranged inside the flange buckle 302. The nozzle 204 is located directly above the topmost cylinder 301, and the bottom end of the lowest cylinder 301 is sealed, and a drainage hole is arranged at the bottom side end of the lowest cylinder 301, and the cylinder 301 is filled with a simulation medium.

[0040] The collecting device 4 includes a plurality of glass dishes 401 , and the glass dishes 401 are used to collect the leachate discharged from the migration simulation device 3 .

[0041] In this embodiment, the supporting device 1 is made of stainless steel, the first bottom plate 101 is 140 cm long and 90 cm wide, the support column 102 is 5 cm in diameter and 70 cm high, a detachable guardrail is fixedly installed between the support columns 102, the second bottom plate 103 is 120 cm long and 60 cm wide, the spacing between the first bottom plate 101 and the second bottom plate 103 is 20 cm, and the rectangular hole 104 is 40 cm long and 24 cm wide.

[0042] In this embodiment, blocking rollers are fixedly connected to the four corners of the bottom end of the first bottom plate 101, and the first bottom plate 101 is 20 cm above the ground.

[0043] In this embodiment, the water tank 201 is a 25L glass cold water bottle, the connecting hole has a diameter of 3 cm, the tray 106 is 40 cm long, 24 cm wide, and 5 cm deep, the tray 106 is 110 cm from the ground, and the legs 105 are fixedly connected to the bottom of the tray 106 at an angle.

[0044] In this embodiment, the adjustable flow range of the peristaltic pump 202 is 0.005 mL / min to 47.4 mL / min, and the inner diameter of the silicone tube 203 is 2.16 mm.

[0045] In this embodiment, the inner diameter of the cylinder 301 is 10 cm, the wall thickness is 0.5 cm, the height is 10 cm, 15 cm or 20 cm, the diameter of the drainage hole is 5 mm, a drainage pipe is inserted in the drainage hole, and a control valve is provided on the drainage pipe.

[0046] In this embodiment, the simulation medium is quartz sand, river sand or soil.

[0047] When using the universal simulation experimental platform for vertical migration of soil pollutants to conduct a simulation experiment, the following steps are included:

[0048] S1, assemble the migration simulation device 3, and fix multiple cylinders 301 together through flange buckles 302. The specifications of cylinders 301 from low to high are 10 cm, 20 cm, 10 cm, and 15 cm respectively. The total assembled height of cylinders 301 is 65 cm. The bottom end of the lowest 10 cm cylinder 301 is split, and a drainage hole is provided in the side end. Then, the cylinder 301 is placed on the second bottom plate 103, and the cylinder 301 is fixedly connected to the detachable guardrail with a cable tie.

[0049] S2, fill the simulated medium, wash and dry the quartz sand with a particle size of 550-1000μm, fill it into the cylinder 301, the height is 60cm, 5cm lower than the total height of the cylinder 301, mix 2200mg of PS (polystyrene) with a particle size of 10μm with 100g of quartz sand, and evenly lay it on the quartz sand in the cylinder (301).

[0050] S3, prepare a shower solution, and add a certain amount of shower solution into the water tank 201, where the shower solution is deionized water.

[0051] S4, installing the collecting device 4, placing the glass dish 401 on the first bottom plate 101, and the glass dish 401 is located below the drainage hole of the cylinder 301 at the bottom layer, and the glass dish 401 can be a glass beaker or a conical flask.

[0052] S5, connecting pipelines, using silicone tube 203 to connect the peristaltic pump 202 with the water tank 201 and the nozzle 204.

[0053] S6, start the experiment, start the peristaltic pump 202, set the output flow rate of the peristaltic pump 202 to 24 mL / min, start leaching, and adjust the control valve on the drain pipe to balance the output flow rate with the discharge flow rate of the drain pipe.

[0054] S7, collecting the leachate, the bottom cylinder 301 discharges the leachate from the drainage hole, and the leachate is collected in the glass dish 401.

[0055] S8, sampling and testing, every time 0.5PV of leachate is collected, an analysis test is carried out to record and analyze the concentration changes of soil pollutants in the leachate.

[0056] S9, the leaching is terminated, and after 32 PV of leachate is collected, the peristaltic pump 202 is turned off to stop the leaching.

[0057] Through the above steps, the vertical infiltration and migration behavior of microplastics in porous media under rainwater leaching conditions can be simulated, and the migration patterns and influencing factors can be analyzed. At the same time, data such as the concentration of microplastics in leachate and media can provide a basis for assessing the environmental risks of microplastics in soil-groundwater systems.

[0058] According to experimental requirements, multiple migration simulation devices 3 can be placed on the carrier device 1 at the same time to conduct multiple groups of experiments at the same time.

[0059] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any way. Any simple modification, change and equivalent change made to the above embodiment according to the essence of the utility model technology still falls within the protection scope of the technical solution of the utility model.

Claims

1. A universal simulation experimental platform for vertical migration of soil pollutants, characterized in that: It comprises a carrying device (1), a leaching simulation device (2), a migration simulation device (3) and a collecting device (4); The bearing device (1) comprises a first bottom plate (101), four support columns (102) are fixedly mounted on the first bottom plate (101), a second bottom plate (103) is fixedly mounted in the middle of the support columns (102), rectangular holes (104) are provided at the centers of the first bottom plate (101) and the second bottom plate (103), four support legs (105) are arranged in the rectangular holes (104), a tray (106) is fixedly mounted on the top of the support legs (105), and the leaching simulation device (2) is located on the tray (106); The leaching simulation device (2) comprises a water tank (201), a peristaltic pump (202), a silicone tube (203) and a nozzle (204); a connection hole for connecting the silicone tube (203) is provided at the top of the water tank (201); and a terminal end of the silicone tube (203) is fixedly connected to the nozzle (204); The migration simulation device (3) is made of a plurality of stacked cylinders (301), the cylinders (301) are fixedly connected by flange buckles (302), a silicone gasket is arranged inside the flange buckle (302), the nozzle (204) is located directly above the cylinder (301) at the top, the bottom end of the cylinder (301) at the lowest end is sealed, a drainage hole is arranged at the bottom side end of the cylinder (301) at the lowest end, and the cylinder (301) is filled with a simulation medium; The collecting device (4) comprises a plurality of glass dishes (401), and the glass dishes (401) are used to collect the leachate generated by the migration simulation device (3).

2. A universal simulation experimental platform for vertical migration of soil pollutants according to claim 1, characterized in that: The bearing device (1) is made of stainless steel, the first bottom plate (101) is 140 cm long and 90 cm wide, the support columns (102) are 5 cm in diameter and 70 cm high, a detachable guardrail is fixedly installed between the support columns (102), the second bottom plate (103) is 120 cm long and 60 cm wide, the distance between the first bottom plate (101) and the second bottom plate (103) is 20 cm, and the rectangular hole (104) is 40 cm long and 24 cm wide.

3. A universal simulation experimental platform for vertical migration of soil pollutants according to claim 2, characterized in that: Blockable rollers are fixedly connected at the four end corners of the bottom end of the first bottom plate (101), and the first bottom plate (101) is 20 cm above the ground.

4. A universal simulation experimental platform for vertical migration of soil pollutants according to claim 2, characterized in that: The water tank (201) is a 25L glass cold water bottle, the connection hole has a diameter of 3 cm, the tray (106) is 40 cm long, 24 cm wide, and 5 cm deep, the tray (106) is 110 cm from the ground, and the legs (105) are fixedly connected to the bottom of the tray (106) in an inclined manner.

5. A universal simulation experimental platform for vertical migration of soil pollutants according to claim 1, characterized in that: The adjustable flow rate range of the peristaltic pump (202) is 0.005 mL / min to 47.4 mL / min, and the inner diameter of the silicone tube (203) is 2.16 mm.

6. A universal simulation experimental platform for vertical migration of soil pollutants according to claim 1, characterized in that: The cylinder (301) has an inner diameter of 10 cm, a wall thickness of 0.5 cm, a height of 10 cm, 15 cm or 20 cm, a diameter of the drainage hole of 5 mm, a drainage pipe inserted in the drainage hole, and a control valve disposed on the drainage pipe.

7. A universal simulation experimental platform for vertical migration of soil pollutants according to claim 1, characterized in that: The simulation medium is quartz sand, river sand or soil.

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