Leaching test device for soil remediation

Abstract

The utility model relates to the field of soil remediation, in particular to a leaching test device for soil remediation, which comprises a barrel, a vacuum pump and a vacuum liquid guide pipe, an opening is formed in the top of the barrel, the barrel is used for containing contaminated soil, leacheate is added to the position above the contaminated soil from the top of the barrel, the vacuum liquid guide pipe is communicated with the barrel, the bottom of the vacuum liquid guide pipe is located below the contaminated soil, the other end of the vacuum liquid guide pipe is connected with the vacuum pump, and the vacuum pump is used for providing negative pressure for the contaminated soil. According to the method, the leaching effect on the low-permeability and high-viscosity soil can be improved, and the research on the diffusion condition and mode of pollutants can be facilitated.

Description

Technical Field

[0001] This application relates to the field of soil remediation, and in particular to a leaching test apparatus for soil remediation. Background Technology

[0002] Currently, the main technologies for contaminated soil remediation are divided into three categories: physical remediation, bioremediation, and chemical remediation. Among them, chemical leaching technology has become the primary method for contaminated soil remediation due to its high efficiency and wide applicability. Chemical leaching technology breaks down the binding between pollutants and soil particles through chemical reactions (such as dissolution, complexation, and redox reactions) between the leaching solution and the pollutants, thereby significantly improving the migration pathways and removal efficiency of pollutants.

[0003] Patent CN219700525U discloses a contaminated soil leaching test device, including a test chamber. The top outer wall of the test chamber has a limiting port, and a feed hopper is welded to the inner wall of the limiting port. A connecting rod is installed on the inner wall of the test chamber, and a triangular cone is installed on the outer wall of one end of the connecting rod. A shower head is bolted to the bottom outer wall of the triangular cone. A soil guide hopper is welded to the inner wall of the test chamber. A water pump is bolted to one side outer wall of the test chamber, and a water inlet pipe is welded to the bottom outer wall of the water pump. A three-way valve is installed at the water outlet of the water pump, and a water guide pipe is bolted to the outer wall of one end of the three-way valve. However, this shower spray mode is difficult to penetrate low-permeability, high-viscosity soils; furthermore, studying the diffusion and mechanisms of pollutants during the leaching process is challenging. Summary of the Invention

[0004] To improve the leaching effect on low-permeability, high-viscosity soils and to facilitate the study of pollutant diffusion patterns and mechanisms, this application provides a leaching test apparatus for soil remediation.

[0005] The leaching test apparatus for soil remediation provided in this application adopts the following technical solution:

[0006] A leaching test apparatus for soil remediation includes a cylinder, a vacuum pump, and a vacuum liquid delivery pipe;

[0007] The top of the cylinder is open, and the cylinder is used to hold contaminated soil. The leachate is added from the top of the cylinder above the contaminated soil. The vacuum liquid guide tube is connected to the cylinder, and the bottom of the vacuum liquid guide tube is located below the contaminated soil. The other end of the vacuum liquid guide tube is connected to a vacuum pump, which is used to provide negative pressure to the contaminated soil.

[0008] By adopting the above technical solution, negative pressure is provided at the bottom of the cylinder, which can improve the penetration effect of the leachate in low-permeability, high-viscosity soil. While improving the leaching effect on the soil, it is also beneficial to the research and analysis of the diffusion and mode of pollutants.

[0009] Optionally, the cylinder is equipped with a drainage plate inside, which is used to filter soil and leachate.

[0010] Optionally, the drainage plate includes a filter membrane and a filter element, wherein the filter element is located inside the filter membrane.

[0011] By adopting the above technical solution, soil and leachate can be filtered. The leachate carries pollutants and is discharged along the channels of the drainage board, which can prevent soil loss and ensure effective separation of pollutants.

[0012] Optionally, the cylinder has openings at both ends, and the opening ends of the cylinder are provided with cylinder rims. The cylinder includes a main body, an upper fixing plate, and a lower fixing plate. The upper fixing plate includes a top cover and a plate body. The main body includes a first half-cylinder and a second half-cylinder that corresponds to and cooperates with the first half-cylinder. The upper fixing plate and the lower fixing plate are detachably connected to the cylinder rim.

[0013] By adopting the above technical solution and using a split composite design, it is easy to disassemble the device after rinsing, thus protecting the original state and integrity of the soil column to the greatest extent.

[0014] Optionally, the cylinder is provided with a rubber strip, which includes a first rubber strip and a second rubber strip. The abutting surfaces on both sides of the first half-cylinder and the second half-cylinder are provided with a first groove, and the first rubber strip is disposed in the first groove. The bottom of the main body is provided with a second groove, and the second rubber strip is disposed in the second groove.

[0015] By adopting the above technical solution, the rubber strip and the cylinder form a sealing structure, which can reduce the difficulty of cylinder assembly and improve the sealing effect of the cylinder.

[0016] Optionally, the cylinder is provided with bolts and nuts, the bolts including a first bolt and a second bolt, the nuts including a first nut and a second nut, the upper fixing plate is fixed to the cylinder edge by the first bolt and the first nut, and the lower fixing plate is fixed to the cylinder edge by the second bolt and the second nut.

[0017] By adopting the above technical solution, the bolts and nuts fix the upper and lower fixing plates to the cylinder edge, which can improve the stability of the cylinder structure.

[0018] Optionally, it also includes a vacuum liquid guide tube, a filter bottle, and a vacuum gauge. The vacuum liquid guide tube is connected to the cylinder, and the other end of the vacuum liquid guide tube is connected to the filter bottle. The filter bottle is equipped with a piston, and the vacuum pump is equipped with a vacuum pump conduit. The piston is connected to the vacuum gauge and the vacuum pump conduit. The vacuum gauge is used to detect the vacuum level inside the filter bottle, and the vacuum pump conduit is used to conduct the negative pressure generated by the vacuum pump into the filter bottle.

[0019] By adopting the above technical solution and implementing the gas-liquid separation design, soil backflow into the vacuum pump can be avoided. With the help of a vacuum gauge to monitor the vacuum level in real time, the leaching liquid can be continuously penetrated into the soil column, avoiding soil structure damage caused by excessive pressure difference and improving the leaching effect on the soil.

[0020] Optionally, the vacuum liquid guide tube is inserted into the cylinder through the opening of the cylinder body, and the bottom end of the vacuum liquid guide tube is located between the contaminated soil and the uncontaminated soil.

[0021] By adopting the above technical solution, the vacuum liquid delivery tube is inserted into the cylinder through the top opening to provide negative pressure to the bottom of the contaminated soil.

[0022] Optionally, it also includes a liquid collection bottle, which is equipped with a liquid collection tube, the other end of which is connected to the bottom of the cylinder.

[0023] By adopting the above technical solution, the collection bottle can collect the rinsing liquid carrying pollutants, avoiding the impact of rinsing liquid retention on the diffusion path of pollutants, and also realizing the recovery of pollutants and rinsing liquid.

[0024] Optionally, it also includes sandbags located below the drainage board, which are used to support the uncontaminated soil.

[0025] By adopting the above technical solution, the arrangement of sandbags not only simulates actual geological conditions, but also serves to filter soil and leachate.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. By providing negative pressure to the cylinder, the penetration effect of the leachate in low-permeability, high-viscosity soil can be improved. While improving the leaching effect on the soil, it is also beneficial to the research and analysis of the diffusion and mode of pollutants.

[0028] 2. By adopting a split composite cylinder structure with rubber strip sealing, the device can be easily disassembled after rinsing, thus protecting the original state and integrity of the soil column to the greatest extent.

[0029] 3. By adopting a filter bottle gas-liquid separation design, soil backflow into the vacuum pump can be avoided. With the vacuum gauge monitoring the vacuum level in real time, the leaching solution can be continuously penetrated into the soil column, avoiding soil structure damage caused by excessive pressure difference and improving the leaching effect on the soil. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0031] Figure 2 This is an exploded structural diagram of Embodiment 1 of this application;

[0032] Figure 3 This is a cross-sectional structural diagram of Embodiment 1 of this application;

[0033] Figure 4 yes Figure 3 A magnified view of part A in the middle;

[0034] Figure 5 This is a bottom view of the main body of Embodiment 1 of this application;

[0035] Figure 6 This is a schematic diagram of the overall structure of Embodiment 2 of this application;

[0036] Figure 7 This is a cross-sectional structural diagram of Embodiment 2 of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Cylinder body; 11. Cylinder rim; 12. Main body; 121. First half-cylinder; 122. Second half-cylinder; 123. First groove; 124. Second groove; 13. Drainage plate; 131. Filter membrane; 132. Filter element; 14. Upper fixing plate; 141. Top cover; 142. Plate body; 15. Lower fixing plate; 16. Adhesive strip; 161. First adhesive strip; 162. Second adhesive strip; 17. Bolt; 171. First bolt; 172. Second bolt; 18. Nut; 181. First nut; 182. Second nut; 2. Vacuum pump; 21. Vacuum pump conduit; 3. Vacuum liquid guide tube; 4. Filter bottle; 41. Piston; 5. Vacuum gauge; 6. Collection bottle; 61. Collection tube; 7. Sand bag. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0039] This application discloses a leaching test apparatus for soil remediation, referring to... Figure 1 The system includes a cylinder 1, a vacuum pump 2, and a vacuum liquid guide pipe 3. The top of the cylinder 1 is open and is used to hold contaminated soil. The washing liquid is added from the top of the cylinder 1 above the contaminated soil. The vacuum liquid guide pipe 3 is connected to the cylinder 1 and its bottom is located below the contaminated soil. The other end of the vacuum liquid guide pipe 3 is connected to the vacuum pump 2, which is used to provide negative pressure to the contaminated soil.

[0040] Example 1: Refer to Figures 2-3The cylinder 1 includes a main body 12, an upper fixing plate 14, and a lower fixing plate 15. The main body 12 has openings at both ends, and the opening ends of the main body 12 are provided with cylinder rims 11 for connection with the upper fixing plate 14 and the lower fixing plate 15. The main body 12 includes a first half-cylinder 121 and a second half-cylinder 122, which are correspondingly fitted. The upper fixing plate and the lower fixing plate are detachably connected to the cylinder rim, which facilitates disassembly of the device after rinsing and maximizes the protection of the original state and integrity of the soil column. The upper fixing plate 14 includes a top cover 141 and a plate body 142, which facilitates the addition of soil column and rinsing fluid from the top of the cylinder.

[0041] Reference Figure 4 The cylinder 1 is provided with bolts 17 and nuts 18. Bolts 17 include a first bolt 171 and a second bolt 172, and nuts 18 include a first nut 181 and a second nut 182. The upper fixing plate 14 is fixed to the cylinder edge 11 by the first bolt 171 and the first nut 181, and the lower fixing plate 15 is fixed to the cylinder edge 11 by the second bolt 172 and the second nut 182, thereby improving the stability of the cylinder structure.

[0042] Reference Figure 2 , Figure 5 The cylinder body 1 is provided with a rubber strip 16, which includes a first rubber strip 161 and a second rubber strip 162. A first groove 123 is provided at the abutment points on both sides of the first half-cylinder 121 and the second half-cylinder 122. The first rubber strip 161 is disposed within the first groove 123 to seal both sides of the cylinder body. A second groove 124 is provided at the bottom of the main body 12, and the second rubber strip 162 is disposed within the second groove 124 to seal the bottom of the cylinder body.

[0043] Reference Figure 3 The leaching test apparatus also includes a filter bottle 4 and a vacuum gauge 5. A drainage plate 13 is installed inside the cylinder 1, comprising a filter membrane 131 and a filter element 132, used to filter soil and leachate. The bottom of the cylinder 1 is connected to a vacuum liquid guide pipe 3, and the other end of the vacuum liquid guide pipe 3 is connected to the filter bottle 4 to achieve gas-liquid separation. A piston 41 is installed on the filter bottle 4, and a vacuum pump conduit 21 is installed on the vacuum pump 2. The piston 41 is connected to the vacuum gauge 5 and the vacuum pump conduit 21. The vacuum gauge 5 is used to detect the vacuum level inside the filter bottle 4. The vacuum pump conduit 21 is used to conduct the negative pressure generated by the vacuum pump 2 into the filter bottle 4.

[0044] The implementation principle of Example 1 is as follows: A soil column is added to the drainage plate 13 inside the cylinder 1, compacted by vibration, and the surface of the soil column is leveled by tapping the cylinder 1. It is then allowed to settle overnight to allow air bubbles to escape. Leaching liquid is added above the soil column, and the vacuum pump 2 is turned on to create a vacuum at the bottom of the cylinder. Under negative pressure, the leaching liquid quickly penetrates into the soil column, rinsing it. After being filtered through the drainage plate 13, the rinsed leachate enters the filter bottle 4 through the vacuum liquid guide tube 3.

[0045] Example 2: Refer to Figures 6-7 The difference between this embodiment and Embodiment 1 is that the vacuum liquid guiding tube 3 is inserted into the cylinder 1 through the opening of the cylinder 1, with the bottom end of the vacuum liquid guiding tube 3 located between the contaminated and uncontaminated soil, and the drainage plate 13 located between the contaminated and uncontaminated soil. The leaching test device also includes a collection bottle 6, which is equipped with a collection tube 61. The other end of the collection tube 61 is connected to the bottom of the cylinder 1 for recovering pollutants and leaching liquid. A sandbag 7 is also provided inside the cylinder 1, located below the drainage plate 13. The sandbag 7 supports the uncontaminated soil and also filters the soil and leaching liquid.

[0046] The implementation principle of Example 2 is as follows: Uncontaminated soil is added between the sandbag 7 and the drainage board 13, and contaminated soil is added above the drainage board 13. The soil is compacted by tamping and the cylinder 1 is tapped to level the surfaces of both contaminated and uncontaminated soil. The mixture is then allowed to settle overnight to allow air bubbles to escape from the soil column. Leaching fluid is added above the contaminated soil, and the vacuum pump 2 is turned on to create a vacuum below the contaminated soil. Under negative pressure, the leaching fluid quickly penetrates the contaminated soil, rinsing it. After being filtered by the drainage board 13, the leaching fluid carrying contaminants diffuses and migrates in the uncontaminated soil. Finally, the leaching fluid passing through the uncontaminated soil enters the collection bottle 6 through the collection pipe 61.

[0047] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A leaching test apparatus for soil remediation, characterized in that, Includes cylinder (1), vacuum pump (2), and vacuum liquid guide pipe (3); The top of the cylinder (1) is open and is used to hold contaminated soil. The leachate is added from the top of the cylinder (1) above the contaminated soil. The vacuum liquid pipe (3) is connected to the cylinder (1). The bottom of the vacuum liquid pipe (3) is located below the contaminated soil. The other end of the vacuum liquid pipe (3) is connected to the vacuum pump (2). The vacuum pump (2) is used to provide negative pressure to the contaminated soil.

2. The leaching test apparatus for soil remediation according to claim 1, characterized in that, The cylinder (1) is equipped with a drainage plate (13) inside, which is used to filter soil and leachate.

3. The leaching test apparatus for soil remediation according to claim 2, characterized in that, The drainage plate (13) includes a filter membrane (131) and a filter element (132), with the filter element (132) located inside the filter membrane (131).

4. The leaching test apparatus for soil remediation according to claim 1, characterized in that, The cylinder (1) has openings at both ends, and the opening ends of the cylinder (1) are provided with cylinder rims (11). The cylinder (1) includes a main body (12), an upper fixing plate (14) and a lower fixing plate (15). The upper fixing plate (14) includes a top cover (141) and a plate body (142). The main body (12) includes a first half-cylinder (121) and a second half-cylinder (122) that corresponds to and cooperates with the first half-cylinder (121). The upper fixing plate (14) and the lower fixing plate (15) are detachably connected to the cylinder rims (11).

5. The leaching test apparatus for soil remediation according to claim 4, characterized in that, The cylinder (1) is provided with a rubber strip (16), the rubber strip (16) includes a first rubber strip (161) and a second rubber strip (162). A first groove (123) is provided at the abutment of the two sides of the first half cylinder (121) or the second half cylinder (122). The first rubber strip (161) is located in the first groove (123). A second groove (124) is provided at the bottom of the main body (12), and the second rubber strip (162) is located in the second groove (124).

6. The leaching test apparatus for soil remediation according to claim 4, characterized in that, The cylinder (1) is provided with bolts (17) and nuts (18). The bolts (17) include a first bolt (171) and a second bolt (172). The nuts (18) include a first nut (181) and a second nut (182). The upper fixing plate (14) is fixed to the cylinder edge (11) by the first bolt (171) and the first nut (181). The lower fixing plate (15) is fixed to the cylinder edge (11) by the second bolt (172) and the second nut (182).

7. The leaching test apparatus for soil remediation according to claim 1, characterized in that, It also includes a filter bottle (4) and a vacuum gauge (5). The other end of the vacuum liquid guide tube (3) is connected to the filter bottle (4). The filter bottle (4) is provided with a piston (41). The vacuum pump (2) is provided with a vacuum pump conduit (21). The piston (41) is connected to the vacuum gauge (5) and the vacuum pump conduit (21). The vacuum gauge (5) is used to detect the vacuum level inside the filter bottle (4). The vacuum pump conduit (21) is used to conduct the negative pressure generated by the vacuum pump (2) into the filter bottle (4).

8. A leaching test apparatus for soil remediation according to claim 7 or 2, characterized in that, The vacuum liquid guide tube (3) is inserted into the cylinder (1) through the opening of the cylinder (1), and the bottom end of the vacuum liquid guide tube (3) is located between the contaminated soil and the uncontaminated soil.

9. A leaching test apparatus for soil remediation according to claim 8, characterized in that, It also includes a liquid collection bottle (6), on which a liquid collection tube (61) is provided, and the other end of the liquid collection tube (61) is connected to the bottom of the cylinder (1).

10. A leaching test apparatus for soil remediation according to claim 8, characterized in that, It also includes sandbags (7) located below the drainage board (13) and used to support uncontaminated soil.

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