Underground infiltration method and device for heavy metal contaminated soil

Abstract

The invention provides a heavy metal contaminated soil subsurface infiltration method and device. The infiltration method comprises the following steps: arranging a range: selecting a main soil type to carry out sample point arrangement; mounting the device: rotationally feeding the water sampling assembly into the soil layer through the connecting assembly, and adjusting the depth of the water sampling assembly penetrating into the soil layer; intelligent monitoring: automatically adjusting the sampling frequency, the percolation rate, the drainage frequency and the burying time of the device; after the liquid level in the water tank meets the requirement, water is pumped out through a water pump in the multi-stage filter tank, and the collected underground percolate water is sent into an underground liquid collection cavity; the percolation device comprises a mounting plate, and the effective collection and monitoring of the underground percolate of the heavy metal contaminated soil are realized by comprehensively considering the soil type, the soil parent material type, the topographic and geomorphic characteristics, the annual rainfall, the evaporation capacity and the irrigation capacity according to a burying time mechanism which is intelligently regulated and controlled according to the rainfall and the irrigation water quantity.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to an underground infiltration method and device for heavy metal contaminated soil. Background Art

[0002] Rainfall and irrigation are important factors that cause the migration and accumulation of heavy metals in cultivated soil. Since the migration of heavy metals during rainfall or irrigation is dynamic and uncertain, it makes the monitoring of heavy metal pollution more difficult. In the prior art, the in-situ underground infiltration collection method for heavy metal contaminated soil often lacks a mechanism for intelligent regulation based on the actual rainfall and irrigation water volume, resulting in low collection efficiency or the collected underground leachate failing to meet the test requirements. There may also be a problem of not being able to obtain the collection volume in time, resulting in direct overflow when the collected underground leachate is too much. Therefore, it is particularly important to develop an efficient, economical, and environmentally friendly in-situ underground infiltration method and device for collecting heavy metal contaminated soil.

[0003] In the current existing technology, rainwater or irrigation water that infiltrates the soil is first collected, and then the collected water samples are extracted by an external vacuum pump. However, in this technology, the collection device is usually a fixed structure, and a pit needs to be dug in advance on the cultivated land. After the collection device is placed, the soil is flattened. This process is inconvenient, and the burial depth of the device needs to be determined according to the depth of the dug pit, which has certain limitations. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a method and device for underground infiltration of heavy metal contaminated soil to solve the problems raised in the above-mentioned background technology. The present invention has a novel structure. The water collection component is sent into the underground through a connecting component, and the depth of the sending can be adjusted. The water collection component can be deployed underground, which is convenient for the movement and deployment of the device, as well as the collection of underground leachate, saving time for layout and digging pits, and realizing effective collection and isolation of heavy metal pollutants, while reducing the impact on the environment. According to the burial time mechanism of intelligent regulation of rainfall and irrigation water volume, soil type, soil parent material type, topographical features, annual rainfall, evaporation, and irrigation volume are comprehensively considered to realize effective collection and monitoring of underground leachate from heavy metal contaminated soil.

[0005] In order to achieve the above-mentioned purpose, the present invention is implemented through the following technical scheme: an underground infiltration device for heavy metal contaminated soil, comprising a mounting plate, wherein fixing columns are slidably inserted at the four corners of the mounting plate, a connecting component is installed at the bottom of the mounting plate, and the connecting component comprises a telescopic column, the top of the storage end of the telescopic column passes through the mounting plate, a top plate is fixed to the bottom of the extended end of the telescopic column, holes of uniform size are opened on the surface of the top plate, and a sliding column is fixed to the bottom of the top plate, a water collection component is arranged around the sliding column, and the water collection component comprises a water tank, and the top of the water tank is fixedly connected to the bottom of the sliding column, A plurality of filter boxes are equidistantly arranged on the outer surface of the sliding column, a primary filter plate is installed on the inner surface of the filter box, and a plurality of secondary filter plates are equidistantly installed inside the water tank, an extraction pipe is inserted into the water tank, through holes are provided at positions of the sliding column, the top plate and the telescopic column corresponding to the extraction pipe, and the extraction pipe passes through the top of the telescopic column and is connected to a multi-stage filter box, an inlet pipe is fixed on the top of one end of the multi-stage filter box, and an outlet pipe is installed on the bottom of the other end of the multi-stage filter box, the inlet pipe is connected to the extraction pipe, an underground liquid collecting chamber made of anti-leakage material is provided near the mounting plate, and the outlet pipe is connected to the underground liquid collecting chamber.

[0006] Furthermore, the connecting assembly also includes a turntable, a turntable is rotatably mounted on the surface of the mounting plate corresponding to the extension of the telescopic column through a bearing, and the outer surface of the storage end of the telescopic column is fixed on the inner ring of the turntable, a handle is fixedly mounted on the surface of the turntable, a first screw is threadedly inserted at the top of the storage end of the telescopic column, and the bottom of the first screw is rotatably connected to the top of the extension end of the telescopic column through a bearing.

[0007] Furthermore, an electric push rod is rotatably mounted on an inner wall of one side of the storage end of the telescopic column through a bearing, the extended end of the electric push rod passes through the telescopic column to fix a second screw, and the bottom thread of the second screw is inserted into the top plate, one end of the second screw passes through the top plate and is rotatably connected to a sliding sleeve, and the sliding sleeve is slidably mounted on the surface of the sliding column, a mounting ring is fixed on the top of the storage end of the telescopic column, and the top of the electric push rod is rotatably mounted on the surface of the mounting ring through a bearing.

[0008] Furthermore, a connecting rod is equidistantly rotatably connected to the outer surface of the sleeve via a rotating shaft, and the other end of the connecting rod is rotatably connected to the top of the filter box via a rotating shaft. A mounting seat is fixed at a position on the top of the water tank corresponding to the bottom of the filter box, and both sides of the bottom of the filter box are rotatably mounted inside the mounting seat via a rotating shaft.

[0009] Furthermore, the water sampling component also includes a slide groove, an annular slide groove is opened on the outer surface of the water tank near the top, and a slip ring is slidably connected inside the slide groove, springs are equidistantly fixed between the top of the slip ring and the inner wall of the slide groove, a baffle frame is fixed on the outer surface of the slip ring, and the outer end of the baffle frame is in extrusion contact with the surface of the filter box.

[0010] Furthermore, a bellows is installed at the bottom outlet end of the filter box, and the other end of the bellows is installed on the top of the water tank.

[0011] Furthermore, a built-in water pump is fixedly installed on the inner wall of the top of the water tank, and the water outlet of the built-in water pump is connected to a delivery pipe. A flushing pipe is fixed on the back of the filter box, and the bottom of the flushing pipe penetrates into the water tank and is connected to the delivery pipe. The other end of the flushing pipe is connected to the top of the filter box.

[0012] Furthermore, a high-precision liquid level sensor and a water volume monitor are installed inside the water tank, a sensor display terminal is installed on the top surface of the mounting plate, and an intelligent control system is arranged inside the sensor display terminal.

[0013] Furthermore, a cone is installed on the periphery of the water tank, a mounting groove is provided inside the cone, the water tank is fixedly installed inside the mounting groove, and the maximum radius of the top of the cone is the same as the top plate.

[0014] A method for underground infiltration of heavy metal contaminated soil, the infiltration method comprising the following steps:

[0015] (1) Layout scope: Within the scope of agricultural land, select the main soil types for sampling point layout. The sampling points are arranged in large areas of agricultural land with relatively flat terrain. The layout of sampling infiltration devices and water sample recovery time are during the local rainy season and irrigation period;

[0016] (2) Installation: Place the cleaned infiltration device into the soil pit, rotate the water collection component into the soil layer through the connecting component, and adjust the depth of penetration into the soil layer. Fill the gaps around the ground entrance with the lower soil layer, lightly step on the covering soil to make the soil looseness close to that of the cultivated soil, and use the electric push rod to unfold the filter box of the water collection component, so that the primary filter plate contacts the soil and filters the large particles in the soil;

[0017] (3) Intelligent monitoring: During rainfall and irrigation, the filter box collects water into the water tank. The filter box is composed of a multi-layer composite low-adsorption infiltration medium. Through a high-precision liquid level sensor and water volume monitor, it monitors the liquid level changes in the liquid collection chamber and the amount of underground leachate in the soil in real time. The data is wirelessly transmitted to the central control unit. The intelligent control system automatically adjusts the sampling frequency, infiltration rate, drainage frequency and burial time of the device according to the monitored rainfall and irrigation water volume, liquid level changes and preset collection requirements;

[0018] (4) Collecting and sending water: When the liquid level inside the water tank reaches the required level, the water is pumped out through the water pump in the multi-stage filter box. The central control unit intelligently adjusts the infiltration rate and pumping frequency based on the liquid level data, and sends the collected underground leachate water into the underground liquid collection cavity;

[0019] (5) Transfer of collected water: The liquid collection chamber has a built-in automatic pumping system, which automatically starts when the liquid level reaches a certain height, and safely transfers the collected liquid to the surface treatment station to avoid underground accumulation.

[0020] Beneficial effects of the present invention:

[0021] 1. The present invention installs the water tank inside the installation groove of the cone, which can reduce the wear and tear caused by the delivery device entering the underground. At the same time, the conical surface of the cone cooperates with the push of the connecting component to facilitate underground movement and adjust the depth of the water collection component. The top radius of the cone is the same as the top plate, and then when the filter box is in the storage state, it will move with the cone, and the soil near the bottom layer is loosened when the cone passes through, which is convenient for the subsequent filter box to unfold and contact the soil.

[0022] 2. The present invention connects the bottom of the filter box with the mounting seat and the bellows, which can facilitate the rotation of the filter box without rotation interference. After a period of use, the water pre-stored in the water tank can be transported to each flushing pipe position through the delivery pipe by the built-in water pump, and then the filter box is flushed from top to bottom through the flushing pipe, thereby preventing soil impurities from drying up inside the filter box and affecting the filtering and delivery of water.

[0023] 3. The present invention drives the top plate, water collection assembly and cone cylinder to rotate synchronously by rotating the telescopic column, and sends the device underground. According to the depth required for arrangement, the first screw is rotated, and the first screw cooperates with the storage end of the telescopic column to extend its extension end, thereby adjusting the burial depth of the water collection assembly.

[0024] 4. After the water collection assembly reaches the designated position, the electric push rod on the mounting ring is rotated to drive the second screw to rotate. The second screw cooperates with the top plate thread to drive the sliding sleeve to slide along the sliding column, and then the connecting rod pushes the filter box outward, and the primary filter plate of the filter box faces upward and contacts the soil. In this process, the baffle frame initially blocks the outer side of the filter box to reduce the wear of the filter box. When the filter box rotates outward, it squeezes the baffle frame to slide downward along the slide groove.

[0025] 5. The present invention maintains connectivity with the filter box by synchronously extending and shortening the telescopic column and the electric push rod, thereby avoiding movement interference.

[0026] 6. The invention maintains connectivity with the filter box by synchronously extending and shortening the telescopic column and the electric push rod, thus avoiding movement interference.

[0027] 7. The present invention uses a high-precision liquid level sensor and a water volume monitor to monitor the liquid level changes in the liquid collection chamber and the amount of underground leachate in the soil in real time. The data is wirelessly transmitted to the central control unit. The intelligent control system automatically adjusts the sampling frequency, infiltration rate, drainage frequency and the burial time of the device according to the monitored rainfall and irrigation water volume, liquid level changes and preset collection requirements, so as to realize automatic operation and reduce labor costs. After the liquid level inside the water tank reaches the requirement, the water is pumped out by the water pump in the multi-stage filter box, and a multi-layer composite low-adsorption infiltration medium is used to reduce the adsorption of the filter medium. The central control unit intelligently adjusts the infiltration rate and the pumping frequency according to the liquid level data, and sends the water after secondary filtration into the underground liquid collection chamber. The liquid collection chamber has a built-in automatic pumping system, which automatically starts when the liquid level reaches a certain height, and safely transfers the collected liquid to the surface treatment station to avoid underground accumulation. It is carried out directly at the pollution site, avoiding the cost and environmental burden brought by soil excavation and transportation. Environmentally friendly materials are used to ensure that no additional pollution is caused to the surrounding environment during the treatment process.

[0028] 8. Compared with the prior art, the present invention sends the water collection component underground through a connecting component, and the depth of the sending can be adjusted. The water collection component can be deployed underground, which is convenient for the movement and deployment of the device, as well as the collection of underground leachate, saving the time of layout and digging pits, and realizing the effective collection and isolation of heavy metal pollutants, while reducing the impact on the environment. According to the burial time mechanism of intelligent regulation of rainfall and irrigation water volume, the soil type, soil parent material type, topographical features, annual rainfall, evaporation, and irrigation volume are comprehensively considered to realize the effective collection and monitoring of underground leachate from heavy metal contaminated soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall process of an underground infiltration method for heavy metal contaminated soil according to the present invention;

[0030] Figure 2 This is a schematic diagram of the overall structure of an underground infiltration device for heavy metal contaminated soil according to the present invention;

[0031] Figure 3 This is a schematic diagram of the surface structure of a mounting plate of an underground infiltration device for heavy metal contaminated soil according to the present invention;

[0032] Figure 4 This is a schematic diagram of the connection between a connection component and a water collection component of an underground infiltration device for heavy metal contaminated soil according to the present invention;

[0033] Figure 5 This is a schematic diagram of the separation of a water tank and a cone cylinder of an underground infiltration device for heavy metal contaminated soil according to the present invention;

[0034] Figure 6 This is a schematic diagram of the top structure of a water tank of an underground infiltration device for heavy metal contaminated soil according to the present invention;

[0035] Figure 7 This is a schematic diagram of the connection between a filter box and a sliding column of an underground infiltration device for heavy metal contaminated soil according to the present invention;

[0036] Figure 8 This is a schematic diagram of the internal structure of a water tank of an underground infiltration device for heavy metal contaminated soil according to the present invention.

[0037] In the figure: 1. mounting plate; 11. fixing column; 12. sensor display end; 2. connecting assembly; 21. telescopic column; 22. first screw; 23. mounting ring; 24. electric push rod; 25. turntable; 26. handle; 27. second screw; 28. top plate; 29. ​​sliding column; 210. sliding sleeve; 211. connecting rod; 3. water sampling assembly; 31. filter box; 32. primary filter plate; 33. flushing pipe; 34. mounting seat; 35. water tank; 351. built-in water pump; 352. delivery pipe; 353. secondary filter plate; 36. bellows; 37. slide groove; 38. baffle frame; 39. slip ring; 310. spring; 4. cone; 41. mounting groove; 5. multi-stage filter box; 51. inlet pipe; 52. outlet pipe; 53. extraction pipe. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0039] See also Figures 1 to 8 The present invention provides a technical solution: an underground infiltration method for heavy metal contaminated soil, the infiltration method comprising the following steps:

[0040] (1) Layout scope: Within the scope of agricultural land, select the main soil types for sampling point layout. The sampling points are arranged in large areas of agricultural land with relatively flat terrain. The layout of sampling infiltration devices and water sample recovery time are during the local rainy season and irrigation period;

[0041] (2) Installation: Place the cleaned infiltration device into the soil pit, rotate the water collection component into the soil layer through the connecting component, and adjust the depth of penetration into the soil layer. Fill the gaps around the ground entrance with the lower soil layer, lightly step on the covering soil to make the soil looseness close to that of the cultivated soil, and use the electric push rod to unfold the filter box of the water collection component, so that the primary filter plate contacts the soil and filters the large particles in the soil;

[0042] (3) Intelligent monitoring: During rainfall and irrigation, the filter box collects water into the water tank. The filter box is composed of a multi-layer composite low-adsorption infiltration medium. Through a high-precision liquid level sensor and water volume monitor, it monitors the liquid level changes in the liquid collection chamber and the amount of underground leachate in the soil in real time. The data is wirelessly transmitted to the central control unit. The intelligent control system automatically adjusts the sampling frequency, infiltration rate, drainage frequency and burial time of the device according to the monitored rainfall and irrigation water volume, liquid level changes and preset collection requirements;

[0043] (4) Collecting and sending water: When the liquid level inside the water tank reaches the required level, the water is pumped out through the water pump in the multi-stage filter box. The central control unit intelligently adjusts the infiltration rate and pumping frequency based on the liquid level data, and sends the collected underground leachate water into the underground liquid collection cavity;

[0044] (5) Transfer of collected water: The liquid collection chamber has a built-in automatic pumping system, which automatically starts when the liquid level reaches a certain height, and safely transfers the collected liquid to the surface treatment station to avoid underground accumulation.

[0045] A heavy metal contaminated soil underground infiltration device, comprising a mounting plate 1, wherein the four corners of the mounting plate 1 are slidably plugged with fixing columns 11, a connecting component 2 is installed at the bottom of the mounting plate 1, the connecting component 2 comprises a telescopic column 21, the top of the storage end of the telescopic column 21 passes through the mounting plate 1, a top plate 28 is fixed to the bottom of the extended end of the telescopic column 21, the surface of the top plate 28 is provided with holes of uniform size, and a sliding column 29 is fixed to the bottom of the top plate 28, a water collection component 3 is arranged around the sliding column 29, the water collection component 3 comprises a water tank 35, the top of the water tank 35 is fixedly connected to the bottom of the sliding column 29, and a plurality of filter boxes 31 are equidistantly arranged on the outer surface of the sliding column 29, a primary filter plate 32 is installed on the inner surface of the filter box 31, and a plurality of secondary filter plates 353 are equidistantly installed inside the water tank 35, and a pump is inserted inside the water tank 35 The outlet pipe 53, the sliding column 29, the top plate 28 and the telescopic column 21 are all provided with through holes at the positions corresponding to the extraction pipe 53, and the extraction pipe 53 passes through the top of the telescopic column 21 and is connected to the multi-stage filter box 5, the top of one end of the multi-stage filter box 5 is fixed with an inlet pipe 51, and the bottom of the other end of the multi-stage filter box 5 is installed with an outlet pipe 52, the inlet pipe 51 is connected with the extraction pipe 53, an underground liquid collecting chamber made of anti-leakage material is arranged near the mounting plate 1, and the outlet pipe 52 is connected with the underground liquid collecting chamber. When using the device, after the device is transferred underground through the connecting component 2 and the cone 4, the mounting plate 1 is placed on the ground and fixed by four fixing columns 11, and then the water collection component 3 is unfolded underground to contact the soil, the infiltrated water enters the water tank 35, is sent into the multi-stage filter box 5 through the extraction pipe 53, and then is sent into the underground liquid collecting chamber through the outlet pipe for storage.

[0046] In this embodiment, the connecting assembly 2 also includes a turntable 25, and the turntable 25 is rotatably mounted on the surface of the mounting plate 1 corresponding to the telescopic column 21 through a bearing, and the outer surface of the storage end of the telescopic column 21 is fixed on the inner ring of the turntable 25, and a handle 26 is fixedly mounted on the surface of the turntable 25, and the top of the storage end of the telescopic column 21 is threadedly plugged with a first screw rod 22, and the bottom of the first screw rod 22 is rotatably connected to the top of the extension end of the telescopic column 21 through a bearing, and an electric push rod 24 is rotatably mounted on the inner wall of one side of the storage end of the telescopic column 21 through a bearing, and the electric push rod 24 is The extended end passes through the telescopic column 21 to fix the second screw 27, and the bottom thread of the second screw 27 is inserted into the top plate 28, and one end of the second screw 27 passing through the top plate 28 is rotatably connected to the sliding sleeve 210, and the sliding sleeve 210 is slidably sleeved on the surface of the sliding column 29, and the top of the storage end of the telescopic column 21 is fixed with a mounting ring 23, and the top of the electric push rod 24 is rotatably mounted on the surface of the mounting ring 23 through a bearing, and the outer surface of the sliding sleeve 210 is rotatably connected with a connecting rod 211 through a rotating shaft, and the other end of the connecting rod 211 is rotatably connected to the top of the filter box 31 through a rotating shaft. A mounting seat 34 is fixed at a position corresponding to the bottom of the filter box 31 on the top of the water tank 35, and the two sides of the bottom of the filter box 31 are rotatably mounted inside the mounting seat 34 through a rotating shaft. The turntable 25 is rotated to drive the top plate 28, the water collection component 3 and the cone 4 to rotate synchronously through the rotation of the telescopic column 21, and the device is sent underground. According to the depth required for arrangement, the first screw 22 is rotated, and the first screw 22 cooperates with the storage end of the telescopic column 21 to extend its extension end, thereby adjusting the burial depth of the water collection component 3. In this process, the electric push rod 24 is synchronously extended to maintain connectivity with the filter box 31. When the water collection component 3 reaches the indicated depth, the electric push rod 24 is connected to the filter box 31. After the position is determined, the electric push rod 24 on the mounting ring 23 is rotated to drive the second screw 27 to rotate. The second screw 27 and the top plate 28 are threadedly matched to drive the sliding sleeve 210 to slide along the sliding column 29, and then the connecting rod 211 pushes the filter box 31 outward, and the primary filter plate 32 of the filter box 31 faces upward and contacts the soil. In this process, the baffle frame 38 initially blocks the outside of the filter box 31 to reduce the wear of the filter box 31. When the filter box 31 rotates outward, the baffle frame 38 will be squeezed to slide downward along the slide groove 37. The top plate 28 is similar to a honeycomb plate-style structure, and there are more through holes on the surface for water to infiltrate and collect.

[0047] In this embodiment, the water sampling component 3 also includes a slide groove 37. An annular slide groove 37 is opened on the outer surface of the water tank 35 near the top, and a slip ring 39 is slidably connected inside the slide groove 37. A spring 310 is fixed equidistantly between the top of the slip ring 39 and the inner wall of the slide groove 37. A baffle frame 38 is fixed on the outer surface of the slip ring 39, and the outer end of the baffle frame 38 is in compression contact with the surface of the filter box 31. A bellows 36 is installed at the bottom outlet end of the filter box 31, and the other end of the bellows 36 is installed on the top of the water tank 35. A built-in A water pump 351 is provided, and a delivery pipe 352 is connected to the water outlet of the built-in water pump 351. A flushing pipe 33 is fixed to the back of the filter box 31, and the bottom of the flushing pipe 33 penetrates into the water tank 35 and is connected to the delivery pipe 352. The other end of the flushing pipe 33 is connected to the top of the filter box 31. A high-precision liquid level sensor and a water volume monitor are installed inside the water tank 35. A sensor display terminal 12 is installed on the top surface of the mounting plate 1, and an intelligent control system is arranged in the sensor display terminal 12. The front of the filter box 31 contacts the soil. Under rainfall or irrigation conditions, the soil The water in the filter enters the filter box 31 through the primary sieve plate to filter out large particles of impurities, and is sent to the water tank 35 through the bellows 36. It is filtered again through the secondary filter plate 353 in the water tank 35, and then temporarily stored in the water tank 35. The water level is detected by the high-precision liquid level sensor and water volume monitor in the water tank 35. When the water level reaches a predetermined height, the signal is fed back to the sensor display terminal 12, and the water pump in the multi-stage filter box 5 is controlled by the intelligent control system to pump out the water for further filtration. The multi-stage filter box 5 is designed with a multi-layer composite low-adsorption percolation medium, including But it is not limited to quartz sand, polyethylene, resin, etc., so that all heavy metals in underground leachate can enter the collection device, thereby improving the collection efficiency. The bottom of the filter box 31 is connected to the mounting seat 34 and the bellows 36, which can facilitate the rotation of the filter box 31 without rotation interference. After a period of use, the water pre-stored in the water tank 35 can be transported to each flushing pipe 33 position through the delivery pipe 352 through the built-in water pump 351, and then the filter box 31 is flushed from top to bottom through the flushing pipe 33, thereby preventing soil impurities from drying up inside the filter box 31 and affecting the filtering and delivery of water.

[0048] In this embodiment, a cone 4 is installed on the periphery of the water tank 35, and a mounting groove 41 is opened inside the cone 4. The water tank 35 is fixedly installed inside the mounting groove 41. The maximum radius of the top of the cone 4 is the same as the top plate 28. Installing the water tank 35 inside the mounting groove 41 of the cone 4 can reduce the wear and tear generated during the delivery device entering the underground. At the same time, the conical surface of the cone 4 cooperates with the push of the connecting component 2 to facilitate underground movement and adjust the depth of the water collection component 3. The top radius of the cone 4 is the same as the top plate 28, and then when the filter box 31 is in the storage state, it will move with the cone 4, and the soil near the bottom layer is loosened by the cone 4, which is convenient for the subsequent filter box 31 to unfold and contact the soil.

[0049] When the device is used, the telescopic column 21 is rotated to drive the top plate 28, the water collection component 3 and the cone 4 to rotate synchronously, and the device is sent underground. According to the required depth of arrangement, the first screw 22 is rotated, and the first screw 22 cooperates with the storage end of the telescopic column 21 to extend its extension end, thereby adjusting the burial depth of the water collection component 3. In this process, the electric push rod 24 is synchronously extended to maintain connectivity. After the water collection component 3 reaches the specified position, the electric push rod 24 on the mounting ring 23 is rotated to drive the second screw 27 to rotate. The second screw 27 cooperates with the thread of the top plate 28 to drive the sliding sleeve 210 The filter box 31 slides along the slide column 29, and then the connecting rod 211 pushes the filter box 31 outward, and the primary filter plate 32 of the filter box 31 faces upward and contacts the soil. In this process, the baffle frame 38 initially blocks the outer side of the filter box 31 to reduce the wear of the filter box 31. When the filter box 31 rotates outward, the baffle frame 38 is squeezed to slide downward along the slide groove 37, and the mounting plate 1 is placed on the ground and fixed by four fixing columns 11. The front of the filter box 31 contacts the soil. Under rainfall or irrigation conditions, the moisture in the soil passes through the primary sieve plate to filter large particles of impurities into the filter box 31 and is sent into the interior of the filter box 31 through the bellows 36. In the water tank 35, the water is filtered again through the secondary filter plate 353 in the water tank 35, and then temporarily stored in the water tank 35. The water level is detected by the high-precision liquid level sensor and water volume monitor in the water tank 35. When the water level reaches a predetermined height, the signal is fed back to the sensor display terminal 12, and the water pump in the multi-stage filter box 5 is controlled by the intelligent control system to pump out the water for further filtration. The multi-stage filter box 5 is designed with a multi-layer composite low-absorption percolation medium, including but not limited to quartz sand, polyethylene, resin, etc., so that all heavy metals in the underground leachate can enter the collection tank. In the collection device, the collection efficiency is improved. The bottom of the filter box 31 is connected to the mounting seat 34 and the bellows 36, which can facilitate the rotation of the filter box 31 without rotation interference. After a period of use, the water pre-stored in the water tank 35 can be transported to each flushing pipe 33 position through the delivery pipe 352 by the built-in water pump 351, and then the filter box 31 is flushed from top to bottom through the flushing pipe 33, so as to prevent soil impurities from drying up inside the filter box 31 and affecting the filtering and transportation of water. The water is then sent to the multi-stage filter box 5 through the extraction pipe 53, and then sent to the underground liquid collection cavity for storage through the outlet pipe.

[0050] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0051] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A heavy metal contaminated soil underground infiltration device, comprising a mounting plate (1), characterized in that: Fixed columns (11) are slidably inserted at the four corners of the mounting plate (1), and a connecting component (2) is installed at the bottom of the mounting plate (1). The connecting component (2) includes a telescopic column (21), and the top of the storage end of the telescopic column (21) passes through the mounting plate (1). A top plate (28) is fixed to the bottom of the extended end of the telescopic column (21). The surface of the top plate (28) is provided with holes of uniform size, and a sliding column (29) is fixed to the bottom of the top plate (28). A water collection component (3) is arranged around the sliding column (29), and the water collection component (3) includes a water tank (35). The top of the water tank (35) is fixedly connected to the bottom of the sliding column (29), and a plurality of filter boxes (31) are equidistantly arranged on the outer surface of the sliding column (29). The inner side of the filter box (31) is provided with a plurality of filter boxes (31). A primary filter plate (32) is installed on the surface, and a plurality of secondary filter plates (353) are installed at equal intervals inside the water tank (35). An extraction pipe (53) is inserted into the water tank (35). Through holes are provided at positions corresponding to the extraction pipe (53) on the sliding column (29), the top plate (28) and the telescopic column (21), and the extraction pipe (53) passes through the top of the telescopic column (21) and is connected to a multi-stage filter box (5). An inlet pipe (51) is fixed to the top of one end of the multi-stage filter box (5), and an outlet pipe (52) is installed at the bottom of the other end of the multi-stage filter box (5). The inlet pipe (51) is connected to the extraction pipe (53). An underground liquid collecting chamber made of anti-leakage material is provided near the mounting plate (1), and the outlet pipe (52) is connected to the underground liquid collecting chamber.

2. The heavy metal contaminated soil underground infiltration device according to claim 1, characterized in that: The connecting assembly (2) further comprises a turntable (25), the turntable (25) being rotatably mounted on the surface of the mounting plate (1) corresponding to the telescopic column (21) passing through the turntable (25) via a bearing, and the outer surface of the storage end of the telescopic column (21) is fixed on the inner ring of the turntable (25), and a handle (26) is fixedly mounted on the surface of the turntable (25), and the top of the storage end of the telescopic column (21) is threadedly inserted with a first screw rod (22), and the bottom of the first screw rod (22) is rotatably connected to the top of the extension end of the telescopic column (21) via a bearing.

3. The underground infiltration device for heavy metal contaminated soil according to claim 2, characterized in that: An electric push rod (24) is rotatably mounted on an inner wall of one side of the storage end of the telescopic column (21) via a bearing, the extended end of the electric push rod (24) passes through the telescopic column (21) to fix a second screw rod (27), and the bottom thread of the second screw rod (27) is inserted into the top plate (28), one end of the second screw rod (27) passing through the top plate (28) is rotatably connected to a sliding sleeve (210), and the sliding sleeve (210) is slidably sleeved on the surface of the sliding column (29), a mounting ring (23) is fixed on the top of the storage end of the telescopic column (21), and the top of the electric push rod (24) is rotatably mounted on the surface of the mounting ring (23) via a bearing.

4. The underground infiltration device for heavy metal contaminated soil according to claim 3, characterized in that: A connecting rod (211) is equidistantly rotatably connected to the outer surface of the sliding sleeve (210) via a rotating shaft, and the other end of the connecting rod (211) is rotatably connected to the top of the filter box (31) via a rotating shaft. A mounting seat (34) is fixed at a position on the top of the water tank (35) corresponding to the bottom of the filter box (31), and two sides of the bottom of the filter box (31) are rotatably mounted inside the mounting seat (34) via a rotating shaft.

5. The underground infiltration device for heavy metal contaminated soil according to claim 4, characterized in that: The water sampling assembly (3) further comprises a slide groove (37), an annular slide groove (37) is provided on the outer surface of the water tank (35) near the top, and a slip ring (39) is slidably connected inside the slide groove (37), a spring (310) is equidistantly fixed between the top of the slip ring (39) and the inner wall of the slide groove (37), a baffle frame (38) is fixed on the outer surface of the slip ring (39), and the outer end of the baffle frame (38) is in compression contact with the surface of the filter box (31).

6. The underground infiltration device for heavy metal contaminated soil according to claim 5, characterized in that: A bellows (36) is installed at the bottom outlet end of the filter box (31), and the other end of the bellows (36) is installed on the top of the water tank (35).

7. The underground infiltration device for heavy metal contaminated soil according to claim 6, characterized in that: A built-in water pump (351) is fixedly mounted on the inner wall at the top of the water tank (35), and a delivery pipe (352) is connected to the water outlet of the built-in water pump (351). A flushing pipe (33) is fixed to the back of the filter box (31), and the bottom of the flushing pipe (33) penetrates into the water tank (35) and is connected to the delivery pipe (352), and the other end of the flushing pipe (33) is connected to the top of the filter box (31).

8. The underground infiltration device for heavy metal contaminated soil according to claim 7, characterized in that: A high-precision liquid level sensor and a water volume monitor are installed inside the water tank (35), a sensor display terminal (12) is installed on the top surface of the mounting plate (1), and an intelligent control system is arranged inside the sensor display terminal (12).

9. The underground infiltration device for heavy metal contaminated soil according to claim 8, characterized in that: A cone (4) is installed on the periphery of the water tank (35), a mounting groove (41) is provided inside the cone (4), the water tank (35) is fixedly installed inside the mounting groove (41), and the maximum radius of the top of the cone (4) is the same as that of the top plate (28).

10. A method for underground infiltration of heavy metal contaminated soil using the device as claimed in claim 1, characterized in that: The diafiltration method comprises the following steps: (1) Layout scope: Within the scope of agricultural land, select the main soil types for sampling point layout. The sampling points are arranged in large areas of agricultural land with relatively flat terrain. The layout of sampling infiltration devices and water sample recovery time are during the local rainy season and irrigation period; (2) Installation: Place the cleaned infiltration device into the soil pit, rotate the water collection component into the soil layer through the connecting component, and adjust the depth of penetration into the soil layer. Fill the gaps around the ground entrance with the lower soil layer, lightly step on the covering soil to make the soil looseness close to that of the cultivated soil, and use the electric push rod to unfold the filter box of the water collection component, so that the primary filter plate contacts the soil and filters the large particles in the soil; (3) Intelligent monitoring: During rainfall and irrigation, the filter box collects water into the water tank. The filter box is composed of a multi-layer composite low-adsorption infiltration medium. Through a high-precision liquid level sensor and water volume monitor, it monitors the liquid level changes in the liquid collection chamber and the amount of underground leachate in the soil in real time. The data is wirelessly transmitted to the central control unit. The intelligent control system automatically adjusts the sampling frequency, infiltration rate, drainage frequency and burial time of the device according to the monitored rainfall and irrigation water volume, liquid level changes and preset collection requirements; (4) Collecting and sending water: When the liquid level inside the water tank reaches the required level, the water is pumped out through the water pump in the multi-stage filter box. The central control unit intelligently adjusts the infiltration rate and pumping frequency based on the liquid level data, and sends the collected underground leachate water into the underground liquid collection cavity; (5) Transfer of collected water: The liquid collection chamber has a built-in automatic pumping system, which automatically starts when the liquid level reaches a certain height, and safely transfers the collected liquid to the surface treatment station to avoid underground accumulation.

Images