A biochar deep buried layer structure and deep heavy metal adsorption detection method

Abstract

A biochar deep buried layer structure and a deep heavy metal adsorption detection method relate to the field of soil remediation and heavy metal adsorption. The biochar deep buried layer structure comprises a first base layer, a second base layer, an adsorption layer, a first covering layer, a second covering layer and a sampling tube. The adsorption layer is composed of biochar. The sampling tube penetrates the adsorption layer. The sampling tube comprises an outer tube and an inner core, and the inner core comprises a rotating shaft, a rotating disk, a sliding bar and a guide plate. The rotating disk can be rotatably matched with the outer tube, and the disk surface of the rotating disk is provided with a sliding groove, and the sliding bar can be slidably matched with the sliding groove. The rotating shaft is fixedly connected to the rotating disk, and the guide plate is fixedly connected to the inner wall of the outer tube. The sliding bar has a guide column, and the guide plate is provided with a guide groove, and the guide column is matched with the guide groove. The sliding bar has a sampling cavity. The outer tube is provided with a sampling port. The rotating shaft is used to drive the rotating disk so that the guide column pushes the sliding bar to extend into the adsorption layer for sampling under the guidance of the guide groove. It has a simple structure, is easy to implement, and can continuously improve the soil.

Description

Technical Field

[0001] The present invention relates to the field of soil remediation and heavy metal adsorption, and in particular to a biochar deep buried layer structure and a deep heavy metal adsorption detection method. Background Art

[0002] Heavy metal pollution in soil and food crops is a widespread environmental problem caused by uncontrolled industrialization, unsustainable urbanization and intensive agricultural practices. As a class of toxic substances, heavy metals pose a high threat to soil quality, food safety and human health. The control of heavy metal pollution in soil is urgent.

[0003] In view of this, this application is hereby filed. Summary of the invention

[0004] The first purpose of the present invention is to provide a biochar deep buried layer structure, which has a simple structure, is easy to implement and has low implementation difficulty. It can effectively and continuously improve the soil, adsorb heavy metals in the soil, and effectively remove heavy metals in the soil, which helps to continuously improve the soil quality and improve the quality of crops. In addition, it is easy to monitor and control, and can very conveniently evaluate the adsorption situation, which is convenient for subsequent maintenance and continuous optimization, and has positive significance for continuously improving the adsorption effect.

[0005] The second object of the present invention is to provide a deep heavy metal adsorption detection method, which is simple to operate and easy to implement, and can very conveniently sample the adsorption layer, which has positive significance for continuous monitoring and optimization of the adsorption effect.

[0006] The embodiment of the present invention is achieved as follows:

[0007] A biomass charcoal deep buried layer structure includes, from bottom to top, a first base layer, a second base layer, an adsorption layer, a first covering layer and a second covering layer. The first base layer and the first covering layer are both composed of gravel, the second base layer is composed of mud and sand, the second covering layer is a soil layer, and the adsorption layer is composed of biomass charcoal.

[0008] The biochar deep buried layer structure is also provided with a sampling tube, which penetrates into the adsorption layer. The sampling tube comprises an outer tube and an inner core, and the inner core comprises a rotating shaft, a rotating disk, a sliding bar and a guide plate.

[0009] The turntable is rotatably matched with the inner wall of the outer tube, the turntable surface is provided with a slide groove, and the slide bar is slidably matched with the slide groove. The rotating shaft is fixedly connected with the turntable, and the guide plate is fixedly connected with the inner wall of the outer tube. The slide bar has a guide column, and the guide plate is provided with a guide groove, and the guide column is slidably matched with the guide groove.

[0010] The slide bar has a sampling cavity formed by a depression in its side wall. The outer tube is provided with a sampling port for the slide bar to extend out. The rotating shaft is used to drive the turntable to rotate, so that the guide column pushes the slide bar through the sampling port and extends into the adsorption layer under the guidance of the guide groove, thereby collecting the sample into the sampling cavity.

[0011] Furthermore, the depth of the slide groove is the same as the thickness of the slide bar, and the width of the slide groove is the same as the width of the slide bar. A rubber ring is provided at the end of the slide groove, and the rubber ring is interference-fitted with the slide bar.

[0012] Furthermore, the chute is arranged along the radial direction of the rotating disk, the rotating shaft is fixedly connected to the disk surface of the rotating disk, the end wall of the rotating shaft is mounted on the chute, and the rotating shaft is fixedly connected to the two side edges of the chute.

[0013] Furthermore, the guide plate is semicircular and has a gap for making way for the rotating shaft. Along the circumference of the rotating shaft, the guide plate is movably matched with the rotating shaft. The guide groove is long and parallel to the straight edge of the guide plate.

[0014] Furthermore, the sampling port extends in an arc shape along the circumference of the outer tube.

[0015] Furthermore, along the axial direction of the outer tube, the outer diameter of the sampling port is smaller than the thickness of the turntable, and the inner walls of the outer tube on both sides of the sampling port are in contact with the turntable.

[0016] Furthermore, the inner cores are divided into multiple groups, and the multiple groups of inner cores are arranged in sequence along the axial direction of the outer tube, and the rotating shaft of one group of inner cores is fixedly connected to the rotating disk of another group of inner cores.

[0017] Furthermore, the outer tube includes a sampling section and a driving section which are detachably connected. The inner core is arranged in the sampling section. The driving section is rotatably provided with a driving shaft, and the driving shaft is detachably connected to the rotating shaft of the inner core.

[0018] Further, the end of the driving shaft is provided with driving rods evenly spaced along the circumference thereof, the driving rods are all arranged along the radial direction of the driving shaft, and the driving rods are all cylindrical. The end of the rotating shaft of the inner core for transmission connection with the driving shaft has a matching piece. The matching piece is arranged along the radial direction of the rotating shaft, and a plurality of matching pieces are evenly spaced along the circumference of the rotating shaft. The matching piece has a matching groove for matching with the driving rod, the cross section of the groove wall of the matching groove is a circular arc, and the corresponding center angle thereof is 180°.

[0019] A deep heavy metal adsorption detection method using the above-mentioned biomass charcoal deep buried layer structure comprises: driving the rotating shaft to rotate to complete sampling; pulling out the sampling tube to take out the sample.

[0020] The beneficial effects of the embodiments of the present invention are:

[0021] The overall structure of the biochar deep buried layer structure provided by the embodiment of the present invention has a first base layer composed of gravel at the bottom, which can play a main supporting role and reduce local collapse and layered structure deformation. The second base layer composed of mud and sand can play an auxiliary supporting role, and the first covering layer composed of mud and sand can "cap" the adsorption layer to avoid tearing of the adsorption layer and enhance the flatness and density of the adsorption layer. The second base layer and the first covering layer also improve the compatibility of the adsorption layer with the surrounding environment, which is convenient for the smooth adsorption of heavy metal ions. The second covering layer is a soil layer, which is used to bury the main functional part of the biochar deep buried layer structure.

[0022] During use, the rotating shaft is rotated. During the rotation of the turntable, the slide bar also rotates relative to the guide plate. Under the guidance of the guide groove, the guide column will slide along the guide groove, and the slide bar will be driven by the guide column to slide along the slide groove, so that the slide bar extends from the sampling port into the adsorption layer, and the biochar in the adsorption layer is collected into the sampling cavity to complete the sampling.

[0023] Through the above operation, the adsorption layer can be sampled conveniently. After sampling, the sampling tube is pulled out, and the sample in the sampling cavity is taken out. By detecting the total metal elements adsorbed in the sample, the adsorption capacity of the adsorption layer and the overall effect of the biochar deep buried layer structure can be directly evaluated. Through the detection of the sample, the residual adsorbable amount, adsorption efficiency, and adsorption stability of the biochar deep buried layer structure can also be comprehensively evaluated, which is of positive significance for continuously optimizing the overall performance of the biochar deep buried layer structure and mastering the soil improvement situation.

[0024] For example, if it is detected that the biochar in the adsorption layer has been saturated with heavy metal elements, the deeply buried adsorption layer can be dug out for unified recycling, and a new adsorption layer can be redeployed for the next cycle of heavy metal adsorption.

[0025] In general, the biochar deep buried layer structure provided by the embodiment of the present invention is simple in structure, easy to implement, and has low implementation difficulty. It can effectively and continuously improve the soil, adsorb heavy metals in the soil, and effectively remove heavy metals in the soil, which helps to continuously improve the soil quality and improve the quality of crops; in addition, it is easy to monitor and control, and can very conveniently evaluate the adsorption situation, which is convenient for subsequent maintenance and continuous optimization, and has positive significance for continuously improving the adsorption effect. The deep heavy metal adsorption detection method provided by the embodiment of the present invention is simple to operate and easy to implement, and can very conveniently sample the adsorption layer, which has positive significance for continuously monitoring and optimizing the adsorption effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic structural diagram of a biochar deep buried layer structure provided in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the structure of the sliding bar of the sampling tube of the deep buried layer structure of biomass charcoal in the first working state;

[0029] Figure 3 for Figure 1 A schematic diagram of the structure of the sliding bar of the sampling tube of the deep buried layer structure of biomass charcoal in the second working state;

[0030] Figure 4 for Figure 1 A schematic diagram of the structure of the sliding bar of the sampling tube of the deep buried layer structure of biomass charcoal in the third working state;

[0031] Figure 5 for Figure 1 A schematic diagram of the structure of the sliding bar of the sampling tube of the deep buried layer structure of biomass charcoal in the fourth working state;

[0032] Figure 6 for Figure 1 A schematic diagram of the structure of the sliding bar of the sampling tube of the deep buried layer structure of biomass charcoal in the fifth working state;

[0033] Figure 7 for Figure 2 A schematic diagram of the coordination of the rotating disk and the rotating shaft of the sampling tube in the first perspective;

[0034] Figure 8 for Figure 7 A magnified image of area A;

[0035] Fig. 9 for Figure 2 A schematic diagram of the coordination of the rotating disk and the rotating shaft of the sampling tube in the second viewing angle;

[0036] Fig.10 for Figure 1 Schematic diagram of the external structure of the sampling tube of the deep buried layer structure of biomass charcoal;

[0037] Fig.11 for Fig.10 Enlarged view of area B;

[0038] Fig.12 for Figure 2 A schematic diagram of the structure of the slide bar of the sampling tube;

[0039] Fig.13 for Figure 2 A schematic diagram of the coordination between the driving section and the sampling section of the sampling tube;

[0040] Fig.14 for Figure 2 Schematic diagram of the coordination between the driving shaft of the sampling tube and the rotating shaft of the inner core.

[0041] Icon: Biochar deep buried layer structure 1000; first base layer 100; second base layer 200; adsorption layer 300, first covering layer 400; second covering layer 500; sampling tube 600; outer tube 610; sampling port 611; sampling section 612; driving section 613; driving shaft 613a; driving support rod 613b; rotating shaft 710; rotating disk 720; sliding groove 721; rubber ring 722; sliding bar 730; guide column 731; sampling cavity 732; guide plate 740; guide groove 741; straight edge 742; fitting 810; fitting groove 811. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0045] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Example

[0048] Please refer to Figure 1 , this embodiment provides a biochar deep buried layer structure 1000. The biochar deep buried layer structure 1000 includes, from bottom to top, a first base layer 100, a second base layer 200, an adsorption layer 300, a first covering layer 400, and a second covering layer 500. Among them, the first base layer 100 and the first covering layer 400 are both composed of gravel, the second base layer 200 is composed of mud and sand, the second covering layer 500 is a soil layer, and the adsorption layer 300 is composed of biochar.

[0049] It should be noted that the biomass charcoal may be tobacco stem biomass charcoal, tobacco stalk biomass charcoal, pine cone biomass charcoal, rape stem biomass charcoal, reed biomass charcoal, etc., and is not limited thereto. In this embodiment, the biomass charcoal of the adsorption layer 300 is reed biomass charcoal.

[0050] Regarding the overall structure of the biochar deep buried layer structure 1000, the bottom is the first base layer 100 composed of gravel, which can play a main supporting role and reduce local collapse and layered structure deformation. The second base layer 200 composed of mud and sand can play an auxiliary supporting role, and the first covering layer 400 composed of mud and sand can "cap" the adsorption layer 300 to avoid tearing of the adsorption layer 300 and enhance the flatness and density of the adsorption layer 300. The second base layer 200 and the first covering layer 400 also improve the compatibility of the adsorption layer 300 with the surrounding environment, which is convenient for the smooth adsorption of heavy metal ions. The second covering layer 500 is a soil layer, which is used to bury the main functional part of the biochar deep buried layer structure 1000.

[0051] It should be noted that the thickness of the second cover layer of the biochar deep buried layer structure 1000 can generally be set at 5 to 8 m, the thickness of the first cover layer can generally be set at 40 to 60 cm, the thickness of the adsorption layer can generally be set at 3 to 5 m, the thickness of the second base layer can generally be set at 40 to 60 cm, and the thickness of the first base layer can generally be set at 0.8 to 1.5 m. Suitable for deep burial to remove heavy metals.

[0052] Please refer to Figure 2The biochar deep buried layer structure 1000 is also provided with a sampling tube 600, which is generally arranged in a vertical direction, and the bottom end of the sampling tube 600 penetrates the adsorption layer 300. The sampling tube 600 includes an outer tube 610 and an inner core, and the inner core includes a rotating shaft 710, a rotating disk 720, a sliding bar 730 and a guide plate 740.

[0053] The outer tube 610 of the sampling tube 600 is cylindrical, and the turntable 720 can be rotatably matched with the inner wall of the outer tube 610. The rotation axis of the turntable 720 coincides with its central axis, and the rotation axis of the turntable 720 is perpendicular to its disk surface. The rotation axis of the turntable 720 coincides with the central axis of the outer tube 610.

[0054] The surface of the rotating disk 720 is provided with a slide groove 721, and the slide bar 730 can be slidably matched with the slide groove 721. The rotating shaft 710 is fixedly connected to the rotating disk 720, and the guide plate 740 is fixedly connected to the inner wall of the outer tube 610. The slide bar 730 has a guide column 731, and the guide plate 740 is provided with a guide groove 741, and the guide column 731 can be slidably matched with the guide groove 741.

[0055] The slide bar 730 has a sampling cavity 732, which is formed by a depression in its side wall. The outer tube 610 is provided with a sampling port 611 for the slide bar 730 to extend out, and the sampling port 611 penetrates the tube wall. The rotating shaft 710 is used to drive the rotating disk 720 to rotate, and then drive the rotating disk 720 to rotate relative to the guide plate 740, so that the guide column 731 pushes the slide bar 730 through the sampling port 611 and extends into the adsorption layer 300 under the guidance of the guide groove 741, so as to collect the sample into the sampling cavity 732.

[0056] During use, the rotating shaft 710 is rotated. During the rotation of the rotating disk 720, the slide bar 730 also rotates relative to the guide plate 740. Under the guidance of the guide groove 741, the guide column 731 will slide along the guide groove 741, and the slide bar 730 will be driven by the guide column 731 to slide along the slide groove 721, so that the slide bar 730 extends from the sampling port 611 into the adsorption layer 300, and the biomass charcoal in the adsorption layer 300 is collected in the sampling cavity 732, and the sampling is completed. Figures 2 to 6 shown.

[0057] Through the above operation, the adsorption layer 300 can be sampled conveniently. After sampling, the sampling tube 600 is pulled out, and the sample in the sampling cavity 732 is taken out. By detecting the total metal elements adsorbed in the sample, the adsorption capacity of the adsorption layer 300 and the overall effect of the biochar deep buried layer structure 1000 can be directly evaluated. By detecting the sample, the residual adsorbable amount, adsorption efficiency, and adsorption stability of the biochar deep buried layer structure 1000 can also be comprehensively evaluated, which is of positive significance for continuously optimizing the overall performance of the biochar deep buried layer structure 1000 and mastering the soil improvement situation.

[0058] For example, if it is detected that the biochar of the adsorption layer 300 has been saturated with heavy metal elements, the deeply buried adsorption layer 300 can be dug out for unified recycling, and a new adsorption layer 300 can be redeployed to perform the next cycle of heavy metal adsorption.

[0059] In general, the biochar deep buried layer structure 1000 has a simple structure, is easy to implement, and has low implementation difficulty. It can effectively and continuously improve the soil, adsorb heavy metals in the soil, and effectively remove heavy metals in the soil, which helps to continuously improve soil quality and improve crop quality. In addition, it is easy to monitor and control, and can very conveniently evaluate the adsorption situation, which is convenient for subsequent maintenance and continuous optimization, and has positive significance for continuously improving the adsorption effect.

[0060] Furthermore, please combine Figures 7 to 12 In this embodiment, the slide groove 721 is formed by a depression in the wall of the rotating disk 720. The depth of the slide groove 721 is the same as the thickness of the slide bar 730, and the width of the slide groove 721 is the same as the width of the slide bar 730, so that the slide bar 730 can be fully fitted into the slide groove 721. A rubber ring 722 is provided at the end portion of the slide groove 721 (the end of the slide groove 721 close to the sampling port 611), and the rubber ring 722 is interference-fitted with the slide bar 730.

[0061] The above design can prevent samples or soil from entering between the slide bar 730 and the slide groove 721, ensuring that the slide bar 730 can slide smoothly, ensuring that the sampling tube 600 can work continuously and stably, and reducing maintenance labor.

[0062] The slide groove 721 is arranged along the radial direction of the rotating disk 720, and the rotating shaft 710 is fixedly connected to the disk surface of the rotating disk 720. The end cover of the rotating shaft 710 is arranged on the slide groove 721, that is, the end wall of the rotating shaft 710 is mounted on the slide groove 721, and the end wall of the rotating shaft 710 is fixedly connected to the two side edges of the slide groove 721. In other words, after the rotating shaft 710 is connected to the rotating disk 720, it is equivalent to encapsulating the slide bar 730 in the slide groove 721. Through this design, the stability of the slide bar 730 can be further improved, and at the same time, the slide bar 730 has a higher sliding driving force.

[0063] Furthermore, the guide plate 740 is semicircular and has a clearance notch for making way for the rotating shaft 710. In this embodiment, the clearance notch is also semicircular, and the guide plate 740 cooperates with the rotating shaft 710 through the clearance notch. The rotating shaft 710 is arranged perpendicular to the guide plate 740. The rotating shaft 710 is located on a side of the rotating disk 720 close to the rotating shaft 710, and the rotating shaft 710 passes through the clearance notch and is connected to the rotating disk 720. Along the circumference of the rotating shaft 710, the guide plate 740 is movably matched with the rotating shaft 710.

[0064] In this embodiment, the guide groove 741 is in the shape of an elongated strip and is arranged parallel to the straight edge 742 of the guide plate 740. The sampling port 611 extends in an arc shape along the circumference of the outer tube 610. With this design, the rotating shaft 710 is continuously rotated in the same direction, and under the guidance of the guide groove 741, the slide bar 730 first extends out of the slide groove 721 and then returns to the slide groove 721 again. In this way, after the sampling is completed, the slide bar 730 retracts and the slide bar 730 is received by the turntable 720, which can ensure that the sample enters the "isolation state" after being collected, and ensure that the sample will not be contaminated by other things during other operations, thereby improving the accuracy of the detection.

[0065] Along the axial direction of the outer tube 610 , the outer diameter of the sampling port 611 is smaller than the thickness of the turntable 720 , and the inner walls of the outer tube 610 on both sides of the sampling port 611 are in contact with the turntable 720 , that is, the turntable 720 seals the edge of the sampling port 611 by being in contact with the inner wall of the outer tube 610 , thereby preventing soil or samples from entering the lumen of the outer tube 610 .

[0066] In this embodiment, there are multiple groups of inner cores, which are arranged in sequence along the axial direction of the outer tube 610, and each inner core is connected to each other through the rotating shaft 710, that is, the rotating shaft 710 of one group of inner cores is fixedly connected to the rotating disk 720 of another group of inner cores. At this time, driving the rotating shaft 710 of the inner core at the top can drive the other inner cores to rotate in sequence, so as to realize synchronous sampling.

[0067] Through the above design, by rotating the rotating shaft 710 once, multiple groups of inner cores can be used to sample the biochar of the adsorption layer 300 at different depths, thereby achieving the purpose of multi-depth point sampling, which is convenient for more comprehensive and objective evaluation of the adsorption state and adsorption effect of the entire adsorption layer 300.

[0068] Please combine Fig.13 and Fig.14 In this embodiment, the outer tube 610 includes a sampling section 612 and a driving section 613 which are detachably connected. The inner core is arranged in the cavity of the sampling section 612, and the sampling port 611 is opened in the tube wall of the sampling section 612. The driving section 613 is rotatably mounted with a driving shaft 613a, and the driving shaft 613a is detachably connected to the rotating shaft 710 of the inner core.

[0069] Specifically, the end of the driving shaft 613a is provided with driving rods 613b evenly spaced along the circumference thereof, the driving rods 613b are all arranged along the radial direction of the driving shaft 613a, and the driving rods 613b are all cylindrical.

[0070] The end of the rotating shaft 710 of the inner core for transmission connection with the driving shaft 613a has a matching piece 810. The matching piece 810 is arranged along the radial direction of the rotating shaft 710, and a plurality of matching pieces 810 are evenly spaced along the circumference of the rotating shaft 710. The matching piece 810 has a matching groove 811 for matching with the driving support rod 613b, and the cross section of the groove wall of the matching groove 811 is a circular arc, and the corresponding center angle thereof is 180°.

[0071] Through the above design, when a sampling is completed, the sampling tube 600 can be pulled out, the sampling section 612 and the driving section 613 can be separated, and a new sampling section 612 can be replaced. When reassembling, the driving support rod 613b at the end of the driving shaft 613a of the driving section 613 is matched with the matching groove 811 of the matching piece 810 of the sampling section 612, and then the driving end and the sampling section 612 are fixedly connected to complete the assembly. The whole process is very simple, convenient for continuous and multi-batch sampling, and there is no need to repeatedly clean the same sampling section 612, which is more efficient and helps to further reduce errors and interference.

[0072] In actual use, multiple sampling tubes 600 may be provided to sample samples at different depths at different locations, thereby further improving the comprehensiveness of the evaluation of the adsorption state and the adsorption effect.

[0073] It should be noted that the biochar of the adsorption layer 300 can be in granular form or powdered form. In this embodiment, powdered biochar is used. In addition, the rotating shaft 710 extends all the way to the top of the sampling tube 600 and extends to the outside of the outer tube 610. In order to facilitate the rotation of the rotating shaft 710, a rotating hand wheel is configured at the end of the rotating shaft 710. Of course, a driving motor, such as a servo motor, can also be configured to drive the rotating shaft 710 to rotate.

[0074] This embodiment also provides a deep heavy metal adsorption detection method using the above-mentioned biomass charcoal deep buried layer structure 1000, which includes: driving the rotating shaft 710 to rotate to complete sampling. Pulling out the sampling tube 600 to take out the sample. The specific operation method has been described in detail above and will not be repeated here.

[0075] In summary, the biochar deep buried layer structure 1000 is simple in structure, easy to implement, and has low implementation difficulty. It can effectively and continuously improve the soil, adsorb heavy metals in the soil, and effectively remove heavy metals in the soil, which helps to continuously improve soil quality and improve crop quality. In addition, it is easy to monitor and control, and can very conveniently evaluate the adsorption situation, which is convenient for subsequent maintenance and continuous optimization, and has positive significance for continuously improving the adsorption effect. The deep heavy metal adsorption detection method is simple to operate and easy to implement, and can very conveniently sample the adsorption layer 300, which has positive significance for continuous monitoring and optimization of the adsorption effect.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A biochar deep buried layer structure, characterized in that: The invention comprises, from bottom to top, a first base layer, a second base layer, an adsorption layer, a first covering layer and a second covering layer; the first base layer and the first covering layer are both composed of gravel, the second base layer is composed of mud and sand, the second covering layer is a soil layer, and the adsorption layer is composed of biomass charcoal; The biochar deep buried layer structure is also provided with a sampling tube, and the sampling tube penetrates the adsorption layer; the sampling tube comprises an outer tube and an inner core, and the inner core comprises a rotating shaft, a rotating disk, a sliding bar and a guide plate; The turntable is rotatably matched with the inner wall of the outer tube, the turntable surface is provided with a slide groove, and the slide bar is slidably matched with the slide groove; the rotating shaft is fixedly connected to the turntable, and the guide plate is fixedly connected to the inner wall of the outer tube; the slide bar has a guide column, the guide plate is provided with a guide groove, and the guide column is slidably matched with the guide groove; The slide bar has a sampling cavity, which is formed by a depression in its side wall; the outer tube is provided with a sampling port for the slide bar to extend out; the rotating shaft is used to drive the rotating disk to rotate, so that the guide column pushes the slide bar through the sampling port and extends into the adsorption layer under the guidance of the guide groove, thereby collecting the sample into the sampling cavity; The guide plate is semicircular and has a gap for making way for the rotating shaft; along the circumference of the rotating shaft, the guide plate is movably matched with the rotating shaft; the guide groove is long and parallel to the straight edge of the guide plate; The sampling port extends in an arc shape along the circumference of the outer tube; The outer tube comprises a sampling section and a driving section which are detachably connected; the inner core is arranged on the sampling section; the driving section is rotatably provided with a driving shaft, and the driving shaft is detachably connected to the rotating shaft of the inner core; The end of the driving shaft is provided with driving support rods evenly spaced along its circumference, and the driving support rods are all arranged along the radial direction of the driving shaft, and the driving support rods are all cylindrical; the end of the rotating shaft of the inner core for transmission connection with the driving shaft has a matching piece; the matching piece is arranged along the radial direction of the rotating shaft, and a plurality of the matching pieces are evenly spaced along the circumference of the rotating shaft; the matching piece has a matching groove for matching with the driving support rod, the cross-section of the groove wall of the matching groove is a circular arc, and the corresponding center angle thereof is 180°.

2. The biochar deep buried layer structure according to claim 1, characterized in that: The depth of the slide groove is the same as the thickness of the slide bar, and the width of the slide groove is the same as the width of the slide bar; a rubber ring is provided at the end of the slide groove, and the rubber ring is interference-fitted with the slide bar.

3. The biochar deep buried layer structure according to claim 1, characterized in that: The slide groove is arranged along the radial direction of the turntable, and the rotating shaft is fixedly connected to the disk surface of the turntable; the end wall of the rotating shaft is mounted on the slide groove, and the rotating shaft is fixedly connected to the two side edges of the slide groove.

4. The biochar deep buried layer structure according to claim 1, characterized in that: Along the axial direction of the outer tube, the outer diameter of the sampling port is smaller than the thickness of the turntable, and the inner walls of the outer tube on both sides of the sampling port are in contact with the turntable.

5. The biochar deep buried layer structure according to claim 1, characterized in that: The inner cores are in multiple groups, and the multiple groups of inner cores are arranged in sequence along the axial direction of the outer tube. The rotating shafts of one group of inner cores are fixedly connected to the rotating disks of another group of inner cores.

6. A deep heavy metal adsorption detection method using the biochar deep buried layer structure as described in any one of claims 1 to 5, characterized in that: include: The rotating shaft is driven to rotate to complete sampling; the sampling tube is pulled out to take out the sample.

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