A waste soil aeration test device and a waste degradation aeration test method

Abstract

The application discloses a kind of waste soil aeration test device and waste degradation aeration test method, it is related to waste degradation aeration test equipment field.The application can detect the temperature and pH value of waste soil at different depths and different axial distance positions in reactor respectively by multiple sensor detection units, while sampler can sample and detect waste soil at different depths and different axial distance positions in reactor;By degradation state detection of waste soil at different depths and different axial distance positions in reactor, the detection accuracy of aeration test can be improved;If the degradation of waste soil at different depths in reactor is detected, the aeration amount of landfill at different depths can be accurately controlled and adjusted during the actual aeration treatment process of landfill according to the detection condition, to improve the aeration degradation effect of waste at different depths of landfill.

Description

Technical Field

[0001] This invention belongs to the field of waste degradation aeration test equipment, and specifically relates to a waste soil aeration test device and a waste degradation aeration test method. Background Technology

[0002] The degradation of municipal solid waste in landfills under natural conditions is slow. Therefore, methods to shorten landfill stabilization time have emerged, and aeration is one such technology to accelerate waste degradation. Compared to traditional landfills, aerobic reactor landfills can reduce or even eliminate methane gas production. Furthermore, the higher temperature of the landfill soil within the aerobic reactor accelerates organic matter degradation, thus reducing environmental pollution and shortening the stabilization time required for the landfill. Therefore, aeration is considered an important means of accelerating landfill soil degradation. Aeration technology provides sufficient oxygen to the landfill, establishing an aerobic environment for microorganisms, enhancing their activity, and thereby accelerating landfill soil degradation. However, because different microorganisms possess different degradation characteristics, the selection of aeration conditions varies in practical engineering. Since the pH value, temperature, moisture content, organic matter content, and degradation rate of the landfill soil continuously change with the degradation time, these indicators can be monitored to assess the landfill soil degradation status.

[0003] The earlier Chinese patent application CN 218098540 U discloses a landfill soil aeration test degradation monitoring system, which can monitor the pH value and temperature of landfill soil in the aeration test, and can sample and test the landfill soil to determine the degradation status. However, it cannot fully detect the degradation status of landfill soil at various locations in the aeration test, making it impossible to accurately control the aeration and accurately deploy the aeration mechanism in the landfill during practical application. Summary of the Invention

[0004] In view of the problems in related technologies, the present invention proposes a waste soil aeration test device and a waste degradation aeration test method to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention is a waste soil aeration test device, including a reactor, an aeration mechanism and a detection mechanism. The reactor is loaded with waste soil for aeration test. The aeration mechanism includes an air supply component and an air distribution component. The air distribution component is inserted into the reactor and the air inlet of the air distribution component is connected to the air supply component so that the air supply component can diffuse air into the reactor through the air distribution component.

[0007] The detection mechanism includes a sampler and multiple sensor detection units capable of detecting temperature and pH value. The multiple sensor detection units are evenly distributed in the reactor along the radial and axial directions of the gas distribution assembly to detect the temperature and pH value of the waste soil at different depths and axial distances within the reactor.

[0008] The reactor is also equipped with multiple sampling ports, and the sampler can extend into the reactor through the corresponding sampling ports to sample the waste soil at different depths and axial distances within the reactor.

[0009] Furthermore, a sealing cap is installed at the top of the reactor, and an exhaust port is provided on the sealing cap. A sealing plug is installed inside the sampling port, and multiple sampling ports are equidistantly distributed along the axial direction of the reactor.

[0010] Furthermore, the gas supply assembly includes an air compressor, which has a gas outlet. An air flow meter and a flow regulating valve are connected and installed on the gas outlet, and the gas outlet is connected to the gas distribution assembly.

[0011] Furthermore, the gas distribution assembly includes a gas distribution pipe, one end of which is connected to a gas guide pipe, and one end of which is connected to a gas supply assembly. The gas distribution pipe is inserted into the reactor, and the gas distribution pipe is provided with multiple sets of axially distributed gas distribution holes, and each set of gas distribution holes is evenly distributed along the circumference of the gas distribution pipe, so that the gas distribution assembly can evenly diffuse gas into the reactor with the gas distribution pipe as the center.

[0012] Furthermore, the detection mechanism also includes a controller, which is connected to multiple sensor detection units via connection lines, and the controller is equipped with a display screen so that the controller can receive and display the detection information of the sensor detection units.

[0013] Furthermore, the sensor detection unit includes a detection rod, which is inserted and installed inside the reactor, and multiple detection rods are evenly distributed along the radial direction of the reactor. Each detection rod is equipped with multiple detection units evenly distributed along the axial direction of the reactor, and each detection unit includes a temperature sensor and a pH sensor.

[0014] Above the reactor, there is a wiring conduit that connects to the top of multiple detection rods. The connecting wires are laid inside the detection rods and connected to multiple temperature sensors and pH sensors on the detection rods. The connecting wires inside the multiple detection rods converge and are laid inside the wiring conduit.

[0015] Furthermore, the sampler includes a sampling rod, one end of which is fixedly equipped with a handle, and the other end of which is provided with a cone. Multiple retractable sampling units distributed along the axial direction are fixedly installed on the sampling rod. The retractable sampling units can retract and adhere to the surface of the sampling rod without sampling when the sampling rod is drilled into the reactor, and when the sampling rod is pulled out of the reactor, the retractable sampling units can unfold under the action of soil resistance to perform sampling.

[0016] The sampling rod is also equipped with a retractable agitator located on one side of the cone. The retractable agitator can retract and fit against the surface of the sampling rod when the sampling rod is drilling into the reactor, and can also open outward when the sampling rod is rotated outward from the reactor to agitate the soil around the borehole drilled by the sampling rod, so that the soil fills the borehole drilled by the sampling rod.

[0017] Furthermore, the retractable sampling unit includes a boss, and a flexible sampling cavity formed by a flexible material is provided on one side of the boss. A plurality of circumferentially distributed support frames are also rotatably installed on one side of the boss, and the support frames are fixedly installed on the outer surface of the flexible material.

[0018] The front end of the support frame extends to the outside of the flexible material, and the front end of the support frame is provided with an outwardly opening inclined plate. The rear end of the support frame is rotatably connected to the boss through an elastic hinge shaft.

[0019] Furthermore, the retractable agitator unit includes a cone, which is fixedly installed on the front end of the sampling rod. On the end of the cone opposite to the cone head, multiple circumferentially distributed agitator blades are rotatably mounted via an elastic hinge shaft.

[0020] This invention also discloses an aeration test method for waste degradation, the specific steps of which are as follows:

[0021] First, based on the properties of the landfill waste, take corresponding landfill waste samples, mix them to form waste soil, and fill the reactor with the waste soil;

[0022] Then, the gas supply component supplies gas to the gas distribution component, so that the gas distribution component diffuses the gas into the reactor from itself as the center, thereby aerating the waste soil in the reactor and assisting in the degradation of the waste soil.

[0023] Multiple sensor units detect the temperature and pH of the waste soil at different depths and axial distances within the reactor. Simultaneously, a sampler can be extended into the reactor through corresponding sampling ports to sample the waste soil at different depths and axial distances. The sampled waste soil is then tested for moisture content and organic matter. By periodically monitoring the temperature, pH, moisture content, and organic matter of the waste soil at different locations within the reactor, the degradation status of the waste soil at different locations within the reactor can be determined.

[0024] The present invention has the following beneficial effects:

[0025] 1. In this invention, multiple sensor detection units can detect the temperature and pH value of the landfill soil at different depths and axial distances within the reactor. Simultaneously, a sampler can collect samples of the landfill soil at different depths and axial distances within the reactor. When landfill waste is degraded using aeration, the gas delivered by the aeration mechanism gradually rises within the landfill, resulting in varying gas content at different depths and consequently different degradation rates. By detecting the degradation status of the landfill soil at different depths within the reactor, the actual aeration treatment at the landfill can be adjusted based on the detection data. During the process, the aeration rate at different depths in the landfill is precisely controlled and adjusted to improve the aeration degradation effect on landfill waste. On the other hand, during aeration, the gas diffuses outward from the aeration unit as the center, and the gas content in the waste pile gradually decreases with distance from the aeration unit, resulting in a decrease in the aeration degradation effect. By detecting the degradation status of the waste soil at different axial positions (different distances from the gas distribution components) in the reactor, the positions of adjacent aeration units can be adjusted during the actual aeration treatment in the landfill based on the detection results, so as to achieve precise layout of the aeration units in the landfill and improve the aeration degradation effect on landfill waste.

[0026] 2. In this invention, multiple retractable sampling units are fixedly installed on the sampling rod, distributed along the axial direction. The retractable sampling units can retract and adhere to the surface of the sampling rod without sampling when the sampling rod is drilling into the reactor. When the sampling rod moves the retractable sampling units to the sampling position, the sampling rod is pulled out of the reactor. At this time, the retractable sampling units can unfold under the action of soil resistance to perform sampling, thereby realizing multi-point sampling and sampling of landfill soil at different axial distances. Furthermore, by using point sampling, the sampling amount can be reduced, preventing excessive sampling from forming cavities in the landfill soil, which would affect the gas transport process during aeration and improve the accuracy of aeration tests.

[0027] 3. In this invention, a retractable agitator is installed on the sampling rod, located on one side of the cone. The retractable agitator can retract and fit against the surface of the sampling rod when the sampling rod is drilling into the reactor, thereby reducing the drilling resistance and making the drilling process easier and less strenuous. When the sampling rod is rotated out of the reactor, the retractable agitator opens outward to agitate the soil around the borehole drilled by the sampling rod. This agitation loosens and displaces the soil around the borehole, allowing it to fill the borehole and restore the soil to its original state after sampling. This not only prevents the borehole from affecting the gas transport process during aeration, but also facilitates multiple samplings of the same location through the sampling port, thus improving the accuracy of the aeration test.

[0028] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, the drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is one of the three-dimensional structural schematic diagrams of the experimental device of the present invention;

[0031] Figure 2 This is a second three-dimensional structural schematic diagram of the experimental device of the present invention;

[0032] Figure 3 This is the third three-dimensional structural schematic diagram of the experimental device of the present invention;

[0033] Figure 4 For the present invention Figure 3 A magnified schematic diagram of the structure at point A;

[0034] Figure 5 This is the fourth three-dimensional structural schematic diagram of the experimental device of the present invention;

[0035] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point B;

[0036] Figure 7 This is the fifth three-dimensional structural schematic diagram of the experimental device of the present invention;

[0037] Figure 8 For the present invention Figure 7 A magnified schematic diagram of the structure at point C.

[0038] In the diagram: 1. Reactor; 11. Sealing cap; 12. Exhaust port; 13. Sampling port; 14. Sealing plug; 2. Aeration mechanism; 21. Air compressor; 22. Air guide pipe; 23. Air distribution pipe; 24. Air flow meter; 25. Flow regulating valve; 26. Gas outlet; 27. Air distribution hole; 3. Detection mechanism; 31. Controller; 32. Detection rod; 33. Wiring conduit; 34. Connecting wire; 35. Sampler; 3501. Sampling rod; 3502. Handle; 3503. Cone; 3504. Boss; 3505. Support frame; 3506. Flexible sampling chamber; 3507. Frustum; 3508. Inclined plate; 3509. Stirring blade; 36. Temperature sensor; 37. pH sensor. Detailed Implementation

[0039] The technical solutions of the embodiments of the invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the invention.

[0040] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "top", "middle", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the invention.

[0041] Example 1

[0042] Please see Figures 1-3 As shown, the present invention is a landfill soil aeration test device, including a reactor 1, an aeration mechanism 2, and a detection mechanism 3. The reactor 1 is loaded with landfill soil for aeration tests. The aeration mechanism 2 includes an air supply component and an air distribution component. The air distribution component is inserted into the reactor 1, and the air inlet end of the air distribution component is connected to the air supply component so that the air supply component can diffuse air into the reactor 1 through the air distribution component. The detection mechanism 3 includes a sampler 35 and multiple sensor detection units that can detect temperature and pH values. The multiple sensor detection units are evenly distributed in the reactor 1 along the radial and axial directions of the air distribution component to detect the temperature and pH value of the landfill soil at different depths and axial distances in the reactor 1. The reactor 1 is also provided with multiple sampling ports 13. The sampler 35 can extend into the reactor 1 through the corresponding sampling ports 13 to sample the landfill soil at different depths and axial distances in the reactor 1.

[0043] When conducting the landfill soil aeration test, firstly, according to the properties of the landfill waste, a corresponding landfill waste sample is taken, mixed to form landfill soil, and then filled into reactor 1. Next, air is supplied to the air distribution component through the air supply component, so that the air distribution component diffuses the air into reactor 1 from itself as the center, thereby aerating the landfill soil in reactor 1 and assisting in the degradation of the landfill soil. Multiple sensor detection units detect the temperature and pH value of the landfill soil at different depths and axial distances in reactor 1. At the same time, the sampler 35 can be extended into reactor 1 through the corresponding sampling port 13 on reactor 1 to sample the landfill soil at different depths and axial distances in reactor 1, and the moisture content and organic matter of the sampled landfill soil are detected.

[0044] Among them, by conducting degradation tests on the landfill soil at different depths and axial distances within reactor 1, the detection accuracy of the aeration test can be improved, thereby facilitating the precise layout and adjustment of the aeration equipment during actual aeration treatment in the landfill, so as to improve the aeration degradation effect of the landfill.

[0045] Specifically, by detecting the degradation of landfill soil at different depths within reactor 1, the aeration rate at different depths in the landfill can be precisely controlled and adjusted during the actual aeration process, thereby improving the aeration degradation effect on landfill waste at different depths. Furthermore, by detecting the degradation of landfill soil at different axial positions (different distances from the air distribution components) within reactor 1, the positions of adjacent aeration devices can be adjusted during the actual aeration process in the landfill, achieving precise deployment of aeration devices in the landfill and further improving the aeration degradation effect on landfill waste.

[0046] Example 2

[0047] Please see Figures 2-6 As shown, the difference between this embodiment and the above embodiment is that a sealing cover 11 is installed at the top of the reactor 1, an exhaust port 12 is provided on the sealing cover 11, a sealing plug 14 is installed in the sampling port 13, and multiple sampling ports 13 are equidistantly distributed along the axial direction of the reactor 1.

[0048] The gas supply assembly includes an air compressor 21, which has a gas outlet 26. An air flow meter 24 and a flow regulating valve 25 are connected and installed on the gas outlet 26, and the gas outlet 26 is connected to the gas distribution assembly.

[0049] The gas distribution assembly includes a gas distribution pipe 23, one end of which is connected to a gas guide pipe 22. One end of the gas guide pipe 22 is connected to a gas supply assembly. The gas distribution pipe 23 is inserted into the reactor 1. The gas distribution pipe 23 is provided with multiple sets of axially distributed gas distribution holes 27, and each set of gas distribution holes 27 is evenly distributed along the circumference of the gas distribution pipe 23, so that the gas distribution assembly can evenly diffuse gas into the reactor 1 with the gas distribution pipe 23 as the center.

[0050] When the waste soil in reactor 1 is aerated and degraded, the flow regulating valve 25 is opened, so that the compressed air in the air compressor 21 is delivered to the air distribution pipe 23 through the air flow meter 24, the flow regulating valve 25, the gas outlet 26 and the air guide pipe 22. Then the air is injected into the reactor 1 through multiple sets of air distribution holes 27 distributed on the air distribution pipe 23 to aerate the waste soil in reactor 1. Afterwards, the air gradually floats up along the waste soil as it diffuses and is then discharged from the exhaust port 12 to maintain air circulation and continuously aerate the waste soil in reactor 1.

[0051] Example 3

[0052] Please see Figure 1 , Figure 2 , Figure 5 , Figure 6 As shown, the difference between this embodiment and the above embodiment is that the detection mechanism 3 also includes a controller 31. The controller 31 is connected to multiple sensor detection units via a connection line 34, and the controller 31 is equipped with a display screen so that the controller 31 can receive and display the detection information of the sensor detection units.

[0053] The sensor detection unit includes a detection rod 32, which is inserted and installed inside the reactor 1. Multiple detection rods 32 are evenly distributed along the radial direction of the reactor 1. Multiple detection units are evenly distributed along the axial direction of the reactor 1 on each detection rod 32. Each detection unit includes a temperature sensor 36 and a pH sensor 37.

[0054] Above the reactor 1, there is also a wiring pipe 33 that is connected to the top of multiple detection rods 32. The connecting wires 34 are laid inside the detection rods 32 and are connected to multiple temperature sensors 36 and pH sensors 37 on the detection rods 32. The connecting wires 34 inside the multiple detection rods 32 are gathered and laid inside the wiring pipe 33.

[0055] Multiple temperature sensors 36 and pH sensors 37 are arrayed within reactor 1 via detection rods 32, enabling them to detect the temperature and pH value of the waste soil at different locations within reactor 1. This reflects the degradation status of the waste soil at different locations within reactor 1. Simultaneously, the temperature sensors 36 and pH sensors 37 transmit the detection data to controller 31 via connecting lines 34, facilitating the display and recording of the detection data. Furthermore, the connecting lines 34 are located within detection rods 32, isolating them from the waste soil and preventing corrosion damage, thus extending their service life.

[0056] Example 4

[0057] Please see Figure 3 , Figures 5-8 As shown, the difference between this embodiment and the above embodiment is that the sampler 35 includes a sampling rod 3501, one end of which is fixedly equipped with a handle 3502, and the other end of which is provided with a cone head 3503. Multiple axially distributed retractable sampling units are fixedly installed on the sampling rod 3501. These retractable sampling units can retract and adhere to the surface of the sampling rod 3501 without sampling when the sampling rod 3501 is inserted into the reactor 1, and when the sampling rod 3501 is withdrawn from the reactor 1... When the sample is extracted, the retractable sampling unit can expand under the action of soil resistance to take samples; the sampling rod 3501 is also equipped with a retractable stirring unit located on one side of the cone 3503. The retractable stirring unit can retract and fit against the surface of the sampling rod 3501 when the sampling rod 3501 is drilled into the reactor 1, and can also open outward when the sampling rod 3501 is rotated out of the reactor 1 to stir the soil around the hole drilled by the sampling rod 3501, so that the soil fills the hole drilled by the sampling rod 3501.

[0058] During sampling, the sealing plug 14 on the corresponding sampling port 13 is opened. Then, the end of the sampling rod 3501 with the cone head 3503 is gradually inserted into the waste soil inside the reactor 1 through the sampling port 13. At this time, the shrinking sampling unit and the shrinking stirring unit shrink and adhere to the surface of the sampling rod 3501 under the squeezing force of the waste soil, so as to reduce the drilling resistance of the sampling rod 3501 and make the drilling process of the sampling rod 3501 easier and less strenuous. When the sampling rod 3501 moves the shrinking sampling unit to the sampling position, the sampling rod 3501 is pulled out of the reactor 1. At this time, the shrinking sampling unit can unfold under the action of soil resistance to carry out sampling, thereby achieving Multiple sampling points are used to sample the waste soil at different axial distances simultaneously. Point sampling reduces the sample volume and prevents excessive sampling from creating cavities in the waste soil. At the same time, the retractable agitator unit expands outward to agitate the waste soil around the borehole drilled by the sampling rod 3501. This agitation loosens and displaces the waste soil around the borehole, allowing it to backfill the borehole drilled by the sampling rod 3501. This restores the waste soil to its original state after sampling. This not only prevents the borehole from affecting the gas transport process during aeration but also facilitates multiple samplings of the same location through the sampling port 13, which helps improve the accuracy of the aeration test.

[0059] Furthermore, the retractable sampling unit includes a boss 3504, one side of which is provided with a flexible sampling cavity 3506 formed by a flexible material. A plurality of circumferentially distributed support frames 3505 are also rotatably mounted on one side of the boss 3504. The support frames 3505 are fixedly mounted on the outer surface of the flexible material. The front end of the support frame 3505 extends to the outside of the flexible material, and the front end of the support frame 3505 is provided with an outwardly opening inclined plate 3508. The rear end of the support frame 3505 is rotatably connected to the boss 3504 through an elastic hinge shaft.

[0060] The flexible material uses high-toughness fabrics such as nylon. When the sampling rod 3501 drills into the waste soil, the support frame 3505 is pressed tightly against the surface of the sampling rod 3501 by the pressure of the waste soil, so that the flexible sampling cavity 3506 is compressed and pressed tightly against the surface of the sampling rod 3501. When the flexible sampling cavity 3506 reaches the sampling position and the sampling rod 3501 is rotated outward and pulled out, the support frame 3505 can have an outward opening force under the rotational elastic force of the elastic hinge shaft, so that the inclined plate 3508 at the end of the support frame 3505 can be inserted into the soil around the sampling rod 3501. Then, as the sampling rod 3501 continues to move outward, the support frame 3505 can rotate outward and unfold under the action of soil resistance, thereby driving the flexible sampling cavity 3506 to unfold outward, and then sampling the waste soil around the sampling rod 3501 through the unfolded flexible sampling cavity 3506.

[0061] Furthermore, the retractable agitator unit includes a cone 3507, which is fixedly installed on the front end of the sampling rod 3501. On the cone 3507, opposite to the cone head 3503, multiple circumferentially distributed agitator blades 3509 are rotatably mounted via an elastic hinge shaft.

[0062] When the sampling rod 3501 drills into the waste soil, the agitator blade 3509 adheres tightly to the surface of the sampling rod 3501 under the squeezing action of the waste soil. When the sampling rod 3501 reaches the sampling position and rotates outward to pull back for sampling, the agitator blade 3509 has an outward opening force under the rotational elastic force of the elastic hinge shaft, so that the end of the agitator blade 3509 can be inserted into the waste soil around the outer ring of the sampling rod 3501. Then, as the sampling rod 3501 and the agitator blade 3509 are held... As the rotating retraction continues, the stirring blade 3509 can rotate and unfold under the resistance of the waste soil until the stirring blade 3509 abuts against one side of the cone 3507. The stirring blade 3509 is in a fully unfolded state. Then, as the sampling rod 3501 rotates and retracts, the stirring blade 3509 rotates and stirs the waste soil around the sampling rod 3501, so that the waste soil around the sampling rod 3501 backfills the drill hole drilled by the sampling rod 3501, so that the waste soil in the reactor 1 returns to its original state.

[0063] Example 5

[0064] This embodiment discloses an aeration test method for waste degradation, the specific steps of which are as follows:

[0065] First, based on the properties of the landfill waste, take corresponding landfill waste samples, mix them to form waste soil, and fill the waste soil into reactor 1;

[0066] Then, the gas supply component supplies gas to the gas distribution component, so that the gas distribution component diffuses the gas into the reactor 1 from itself as the center, thereby aerating the waste soil in the reactor 1 and assisting the waste soil in degradation.

[0067] Multiple sensor detection units detect the temperature and pH value of the waste soil at different depths and axial distances within reactor 1. Simultaneously, a sampler 35 can be extended into reactor 1 through the corresponding sampling port 13 to sample the waste soil at different depths and axial distances within reactor 1. The sampled waste soil is then tested for moisture content and organic matter. By periodically detecting the temperature, pH value, moisture content, and organic matter of the waste soil at different locations within reactor 1, the degradation status of the waste soil at different locations within reactor 1 can be determined.

[0068] Furthermore, this embodiment uses a reactor 1 with a volume of 20L, a diameter of 306mm, an inlet diameter of 186mm, and a height of 420mm. Before the experiment, temperature sensor 36 and pH sensor 37 are placed in corresponding positions inside reactor 1. During the experiment, reactor 1 is placed in a 40℃ water bath and the experiment is conducted at a constant temperature. During aeration, air is supplied to reactor 1 through air compressor 21; the aeration rate is controlled by connecting air flow meter 24 and flow regulating valve 25; and air is evenly introduced into the waste pile through air distribution pipe 23. The flow regulating valve 25 is a needle valve used to regulate small airflows. The working principle of the air flow meter 24 is as follows: there is a proportional relationship between the flow rate and the gas flow area. The gas flows from bottom to top through the flow meter tube, and the float is subjected to pressure. When a pressure difference is formed in the tube, the float is subjected to an upward force. When the upward force is balanced with gravity and buoyancy, the height of the float corresponds to the scale of the flow rate. The air distribution pipe 23 is a PVC pipe with a diameter of 50 mm and a height of 260 mm. Four rows of air distribution holes 27 with a diameter of 10 mm are evenly opened along the circumference of the pipe. The vertical spacing of the air distribution holes 27 is 50 mm. The opening rate of the aeration pipe is 2.3%. Its bottom end is sealed, and its upper end is connected to the air compressor 21 through the air guide pipe 22 to ensure that the air is evenly introduced into the garbage pile.

[0069] In the aeration experiment, the radius of influence was determined based on a simplified model of gas pressure distribution:

[0070]

[0071] In the formula: P is the gas pressure, Pa; Q is the aeration rate, m³ / s; D is the diameter of the aeration pipe, m; H is the length of the aeration pipe, m; R is the radius of influence, m; Kh is the horizontal permeability coefficient of the gas, m. 2 / (Pa·s), generally taken as 10 -7 ~10 -5 m 2 / (Pa·s).

[0072] In this embodiment, the air compressor 21 provides an air pressure of 0.7 MPa and an aeration rate of 0.009 L / s (taking the minimum aeration rate of 0.05 L / min / kg waste); the air distribution pipe 23 has a diameter of 50 mm, an effective length of 260 mm, and a typical Kh value of 10. -6 m 2 / (Pa·s). According to the above formula, the radius of influence R is calculated to be 2977.5mm, which is much larger than the radius of the reactor barrel of 153mm. Therefore, the air pressure provided by the air compressor can allow air to be introduced into the entire waste pile, so that the aeration test can be carried out smoothly.

[0073] Furthermore, during the experiment, the temperature and pH value of the waste soil sample were recorded every 10 minutes, and waste soil samples were taken and tested every 24 hours.

[0074] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0075] The preferred embodiments of the invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A waste soil aeration test device, comprising a reactor, an aeration mechanism, and a detection mechanism, characterized in that: The reactor is loaded with waste soil for aeration tests. The aeration mechanism includes an air supply component and an air distribution component. The air distribution component is inserted into the reactor and its air inlet is connected to the air supply component so that the air supply component can diffuse air into the reactor through the air distribution component. The detection mechanism includes a sampler and multiple sensor detection units capable of detecting temperature and pH value. The multiple sensor detection units are evenly distributed in the reactor along the radial and axial directions of the gas distribution assembly to detect the temperature and pH value of the waste soil at different depths and axial distances within the reactor. The reactor is also equipped with multiple sampling ports, and the sampler can extend into the reactor through the corresponding sampling ports to sample the waste soil at different depths and axial distances within the reactor. The sampler includes a sampling rod, one end of which is fixedly equipped with a handle and the other end of which is provided with a cone. Multiple retractable sampling units are fixedly installed on the sampling rod along the axial direction. The retractable sampling units can retract and adhere to the surface of the sampling rod without sampling when the sampling rod is drilled into the reactor, and can unfold and sample under the action of soil resistance when the sampling rod is pulled out of the reactor. The sampling rod is also equipped with a retractable agitator located on one side of the cone. The retractable agitator can retract and fit against the surface of the sampling rod when the sampling rod is drilling into the reactor, and can also open outward when the sampling rod is rotated outward from the reactor to agitate the soil around the borehole drilled by the sampling rod, so that the soil fills the borehole drilled by the sampling rod. The retractable sampling unit includes a boss, and a flexible sampling cavity formed by a flexible material is provided on one side of the boss. A plurality of circumferentially distributed support frames are also rotatably installed on one side of the boss, and the support frames are fixedly installed on the outer surface of the flexible material. The front end of the support frame extends to the outside of the flexible material, and the front end of the support frame is provided with an outwardly opening inclined plate. The rear end of the support frame is rotatably connected to the boss through an elastic hinge shaft. The retractable agitator unit includes a cone, which is fixedly installed on the front end of the sampling rod. Multiple agitator blades are rotatably mounted on the cone at the end opposite to the cone head via an elastic hinge shaft.

2. The waste soil aeration test device according to claim 1, characterized in that: The top of the reactor is equipped with a sealing cap with an exhaust port. The sampling port is equipped with a sealing plug, and multiple sampling ports are equidistantly distributed along the axial direction of the reactor.

3. The waste soil aeration test device according to claim 1, characterized in that: The gas supply assembly includes an air compressor, which has a gas outlet. An air flow meter and a flow regulating valve are connected to the gas outlet, and the gas outlet is connected to the gas distribution assembly.

4. The waste soil aeration test device according to claim 1, characterized in that: The gas distribution assembly includes a gas distribution pipe, one end of which is connected to a gas guide pipe, and the other end of which is connected to a gas supply assembly. The gas distribution pipe is inserted into the reactor, and the gas distribution pipe is provided with multiple sets of axially distributed gas distribution holes, and each set of gas distribution holes is evenly distributed along the circumference of the gas distribution pipe, so that the gas distribution assembly can evenly diffuse gas into the reactor with the gas distribution pipe as the center.

5. A waste soil aeration test device according to any one of claims 1-4, characterized in that: The detection mechanism also includes a controller, which is connected to multiple sensor detection units via connection lines. The controller is equipped with a display screen so that it can receive and display the detection information from the sensor detection units.

6. The waste soil aeration test device according to claim 5, characterized in that: The sensor detection unit includes a detection rod, which is inserted and installed inside the reactor. Multiple detection rods are evenly distributed along the radial direction of the reactor. Each detection rod is equipped with multiple detection units evenly distributed along the axial direction of the reactor. Each detection unit includes a temperature sensor and a pH sensor. Above the reactor, there is a wiring conduit that connects to the top of multiple detection rods. The connecting wires are laid inside the detection rods and connected to multiple temperature sensors and pH sensors on the detection rods. The connecting wires inside the multiple detection rods converge and are laid inside the wiring conduit.

7. An aeration test method for waste degradation, using the waste soil aeration test device according to any one of claims 1-6, characterized in that, The specific steps are as follows: First, based on the properties of the landfill waste, take corresponding landfill waste samples, mix them to form waste soil, and fill the reactor with the waste soil; Then, the gas supply component supplies gas to the gas distribution component, so that the gas distribution component diffuses the gas into the reactor from itself as the center, thereby aerating the waste soil in the reactor and assisting the waste soil in degradation. Multiple sensor units detect the temperature and pH of the waste soil at different depths and axial distances within the reactor. Simultaneously, a sampler can be extended into the reactor through corresponding sampling ports to sample the waste soil at different depths and axial distances. The sampled waste soil is then tested for moisture content and organic matter. By periodically monitoring the temperature, pH, moisture content, and organic matter of the waste soil at different locations within the reactor, the degradation status of the waste soil at different locations within the reactor can be determined.

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