Soil composite in-situ remediation device and method based on multi-channel cooperation of spiral drill bit

Abstract

The invention provides a soil composite in-situ remediation device and method based on multi-channel cooperation of a spiral drill bit, the soil composite in-situ remediation device comprises a supporting frame, a discharging mechanism used for conveying soil remediation materials is installed in the supporting frame, and one end of the supporting frame is used for driving a drill bit to rotate and move up and down; a plurality of storage boxes are installed on the surface of the supporting frame, and a vibrating mechanism used for driving the storage boxes to continuously vibrate is installed on the side wall of the driving mechanism; the top end of the drill bit is provided with a sealing mechanism for preventing materials from gushing out; an adjusting mechanism for pressing materials into soil is mounted on the side wall of the driving mechanism; the soil composite in-situ remediation device and method based on multi-channel cooperation of the auger bit have the advantages that multi-channel cooperation soil remediation is achieved, the construction period is shortened, the remediation cost is reduced, and remediation agent gushing is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a composite in-situ soil remediation device and method based on multi-channel coordination of a spiral drill bit. Background Art

[0002] Heavy metals in coastal soils mainly come from industrial wastewater discharge, agricultural fertilizer application, port transportation and atmospheric deposition. Offshore microplastics mainly come from land-based plastic waste (such as fishing nets, packaging materials), marine ship operations and aquaculture waste. Organic pollution in coastal areas is mainly polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), and petroleum hydrocarbons, which come from chemical emissions, ship leakage and agricultural pesticide residues. There is often complex pollution of heavy metals-microplastics-organic matter in coastal areas, which aggravates ecological risks. Coastal areas have the triple core values ​​of ecology, economy and resources. Complex pollution has led to the degradation of ecosystem service functions (such as a 17% increase in coral bleaching rates), and pollution has spread to global waters (microplastics have been detected in Antarctic penguins). Technological breakthroughs are urgently needed to ensure sustainable development.

[0003] Existing patent CN110013883A is a composite material for treating heavy metal-organic pollution, its preparation method and application, which uses silver phosphate-titanium dioxide (Ag3PO4 / TiO2) composite material and zero-valent iron (ACF-nZVI) composite, silver phosphate-titanium dioxide degrades organic matter by photocatalysis, and titanium dioxide inhibits the photocorrosion of silver phosphate and improves stability. The zero-valent iron composite material is loaded on activated carbon fiber (ACF), passivates heavy metals (such as Cr, Cu, Cd, etc.) by reduction reaction, and efficiently degrades organic matter (such as polycyclic aromatic hydrocarbons) and passivates heavy metals. However, silver phosphate in this technology needs to be activated by light, and its application in deep soil or water bodies is limited. Zero-valent iron may fail to oxidize during long-term use, resulting in a decrease in passivation ability. The outer photocatalytic layer is physically separated from the inner zero-valent iron layer, which may reduce the efficiency of pollutant synergistic treatment. There are many limitations in the in-situ remediation of soil in coastal areas.

[0004] The second existing patent CN118527465A is a chemical oxidation-chelation method that can be used for in-situ remediation of organic-heavy metal composite contaminated soil. This patent uses a chemical oxidation-chelation joint technology, using sodium percarbonate as an oxidant to decompose organic matter (such as petroleum hydrocarbons, pesticides), using PEI-DTCS chelating agent to chelate heavy metals (especially arsenic), inhibiting its migration, and realizing the oxidation of organic pollutants and stabilization of heavy metals by turning the soil and spraying the remediation agent, and simultaneously treating the composite pollution of organic matter and arsenic. However, the decomposition of sodium percarbonate may produce an alkaline environment, which affects the activity of soil microorganisms, and the remediation cycle is long, requiring 7 to 15 days of soil cultivation time, making it difficult to quickly repair high-concentration contaminated sites.

[0005] Prior Art Three: CN208944818U, a new type of mobile soil treatment equipment for repairing organic pollution, discloses a new type of mobile soil treatment equipment for repairing organic pollution. Multiple groups of crushing shafts are linked by chains and belts to achieve sufficient crushing of the soil. The inclined heating plate + S-shaped heating tube evenly heats the soil to promote the evaporation of volatile organic compounds. The inclined design of the heating plate avoids soil accumulation. The volatile gas is introduced into the collection box through the air duct and absorbed and treated with the reaction liquid to reduce secondary pollution. However, there is a risk of blockage in the screening system. When treating sticky soil or high-humidity soil, the screening net is easily adhered and blocked, and frequent cleaning is required.

[0006] Prior Art Four: CN117244926A, a device and method for in-situ remediation of chemically polluted soil, forms a porous structure in the clay layer through an auxiliary diffusion mechanism to expand the penetration path of the remediation liquid. Through the switching mechanism, when the remediation is not carried out, the sealing block is controlled to close the diversion channel to avoid the leakage of the remediation liquid. However, the multi-stage transmission mechanism (worm gear, lead screw, gear, etc.) and the sealing components (insulation sleeve, rotary joint) make the device structure complex, prone to wear during long-term use, and the maintenance cost is relatively high. The spraying of the diversion channel in this design depends on the rotation speed of the sub-drill pipe. If the rotation speed does not match the flow rate of the remediation liquid, local overspray or uneven spraying may occur. At the same time, this design does not have a multi-channel liquid injection function and cannot achieve the composite remediation of heavy metals - organic pollutants - microplastics.

[0007] The above prior arts are not suitable for in-situ remediation in offshore areas and do not involve the remediation of microplastics.

[0008] Therefore, it is necessary to provide a new soil composite in-situ remediation device and method based on the multi-channel cooperation of spiral drills to solve the above technical problems. Summary of the Invention

[0009] The technical problem solved by the present invention is to provide a soil composite in-situ remediation device and method based on the multi-channel cooperation of spiral drills, which can repair the soil through multi-channel cooperation, shorten the construction period, reduce the remediation cost, and avoid the gushing out of the remediation agent.

[0010] To solve the above technical problems, the soil composite in-situ remediation device based on the multi-channel cooperation of a spiral drill bit provided by the present invention includes: a support frame, an unloading mechanism for transporting soil remediation materials is installed inside the support frame, and a driving mechanism for driving the drill bit to rotate and move up and down is provided at one end of the support frame; a plurality of storage boxes are installed on the surface of the support frame, and a vibration mechanism for driving the storage boxes to vibrate continuously is installed on the side wall of the driving mechanism; a sealing mechanism for preventing the material from gushing out is installed at the top end of the drill bit; the sealing mechanism includes a cover plate, and the top end of the drill bit is rotatably connected to the cover plate; the bottom end of the cover plate is conical, and the top end of the cover plate is inclined; an annular groove is provided inside the cover plate, a plug is slidably connected inside the groove, a limiting block is installed inside the groove, and the limiting block abuts against the side wall of the plug; a plurality of springs are installed inside the groove, and one end of the spring is connected to the plug; a plurality of communication grooves are inclinedly provided at the bottom end of the cover plate, and the top end of the communication groove is slidably connected to the plug; a regulating mechanism for pressing the material into the soil is installed on the side wall of the driving mechanism, the regulating mechanism includes a compression cylinder, a piston and a crank connecting rod are slidably connected inside the compression cylinder, and the crank connecting rod is rotatably connected to the piston; an exhaust pipe and an intake pipe with a curved surface are installed on the side wall of the compression cylinder; the exhaust pipe is communicated with the unloading mechanism through a connecting pipe, and the exhaust pipe is communicated with the inside of the groove; a support net and a block with a funnel-shaped inside are installed inside the exhaust pipe and the intake pipe, a ball is clamped inside the block, and the ball abuts against the support net; the block, the support net and the ball form a one-way valve, and the installation direction of the one-way valve inside the exhaust pipe is opposite to the installation direction of the one-way valve inside the intake pipe.

[0011] Preferably, the driving mechanism includes a first box body and a second box body. Motors are installed on the side walls of both the first box body and the second box body. A first gear and a main gear are rotatably connected inside the first box body and the second box body. The main gear meshes with the first gear, and the main gear is connected to the output shaft of the motor. The diameter of the main gear is much smaller than the diameter of the first gear.

[0012] Preferably, a compression cylinder is installed on the side wall of the first box body; inside the first box body, the drill bit is fixedly connected to the center of the first gear, the crank connecting rod is installed at the bottom end of the main gear, and the crank connecting rod is rotatably connected to the inside of the first box body.

[0013] Preferably, inside the second box body, the first gear is threadedly connected to a screw rod, and the bottom end of the screw rod is fixedly connected to the first box body.

[0014] Preferably, the vibration mechanism includes a vibration box, inside which a rotating shaft and a second gear are rotatably connected. The second gear meshes with the main gear inside the second box body; the second gear is fixedly connected to the middle of the side wall of the rotating shaft, and eccentric blocks are symmetrically installed on the side wall of the rotating shaft.

[0015] Preferably, a connecting frame is fixedly connected to the side wall of the support frame, and a vibration box is installed on the side wall of the connecting frame. A plurality of storage boxes are installed on the surface of the connecting frame.

[0016] Preferably, the blanking mechanism includes a cylinder body, which is installed on the side wall of the support frame. A turbine is rotatably connected inside the cylinder body; a motor is installed on the side wall of the support frame, and the output shaft of the motor is connected to the turbine; a plurality of connecting pipes are installed in the middle of the side wall of the cylinder body, and one such connecting pipe is installed on the side wall of each storage box; a feeding hose is installed on the side wall of the cylinder body, and a connector is installed at one end of the feeding hose.

[0017] Preferably, solenoid valves are installed on the side walls of the feeding hose, the connecting pipes, the exhaust pipe, and the connecting pipe.

[0018] Preferably, the drill bit includes a rotating rod, the top end of which is fixed inside a chuck through bolts. The top end of the chuck is rotatably connected to a connector. A spiral blade is installed on the side wall of the rotating rod; a plurality of spray heads are obliquely installed on the side wall of the rotating rod. Elastic rods with an arc-shaped side wall are symmetrically installed on the side wall of the spray heads. A conical sealing block is installed at one end of the elastic rod, and the sealing block is stuck at the outlet of the spray head.

[0019] A method for in-situ soil composite remediation based on multi-channel cooperation of a spiral drill bit specifically includes the following steps:

[0020] Step 1: Fix the support frame on a towing machine. In the soil to be remediated, a hydroxyapatite suspension, an iron-based biochar bin, a composite bacterial agent mixture, and sodium acetate particles are respectively added to the storage boxes. When remediating the soil, connect the device to an external power supply and turn on the driving mechanism to make the drill bit enter the soil.

[0021] Step 2: During the process of the drill bit drilling into the soil, the gas inside the compression cylinder continuously enters the inside of the drill bit and then sprays out through the spray heads, continuously jetting out gas during the process of the spray heads entering the soil, thereby preventing the spray heads from being blocked by the soil.

[0022] Step 3: As the drill bit enters the soil layer, the rotating head drives the cover plate into the soil, and the top of the hole drilled by the cover plate is sealed; the feeding mechanism is opened, and the hydroxyapatite suspension, iron-based biochar bin, compound microbial agent mixture, and sodium acetate particles are sprayed into the soil in sequence; during the spraying of the repair substances, the gas inside the compression cylinder enters the inside of the groove through the exhaust pipe, and the gas then quickly enters the inside of the drill hole downward through the communication groove. At this time, the blade rotates continuously to stir the soil, so that the soil and the repair substances are evenly mixed. At the same time, air continuously moves downward into the moving soil, and the air pushes the soil to move outward, increasing the stirring range of the soil. At the same time, it pushes the repair substances to move into the surrounding soil layers, increasing the repair range. At the same time, the repair substances and the soil are evenly mixed. The cover plate seals the top of the drill hole and continuously conveys compressed gas downward, avoiding the upward gushing of the repair substances. At the same time, it increases the movement range of the repair substances in the soil and provides the soil repair effect; through the in-situ repair technology, the present invention avoids soil excavation, reduces the damage to the coastal zone, conforms to the principle of giving priority to ecological protection, and reduces the input of manpower and material resources. By means of multi-channel collaborative repair, the construction period is shortened and the repair cost is reduced. By means of the adjustment mechanism and the sealing mechanism, the problem of the gushing out of the repair agent is solved. It has triple values of ecological repair, economic gain, and social benefits, and provides a solution for the soil treatment in the global coastal areas.

[0023] Compared with the related technologies, the soil composite in-situ repair device and method based on a spiral drill bit with multi-channel collaboration provided by the present invention have the following beneficial effects:

[0024] The present invention provides a device and method for in-situ remediation of soil composites based on multi-channel cooperation of spiral drills; through a multi-channel cooperative remediation mechanism, combining deep mixing of spiral drills and gas-assisted diffusion technology, synchronous in-situ treatment of heavy metal, organic matter and microplastic composite pollution is achieved. First, hydroxyapatite is sprayed to passivate heavy metals and reduce heavy metals in the soil. Then, iron-based biochar bins are sprayed to adsorb microplastics. Finally, a composite microbial agent mixture and sodium acetate particles are sprayed to degrade organic pollutants through microbial degradation. The passivation of hydroxyapatite reduces soil heavy metals, which is beneficial to the reproduction of microorganisms. The iron-based biochar bins provide attachment points for the reproduction of microorganisms, accelerating the reproduction efficiency of microorganisms and the soil remediation efficiency. Through the rotation and stirring of spiral blades and the lateral diffusion of compressed gas, the mixing uniformity of the remediation agent and the soil is improved. Different remediation agents are sub-packed in a multi-channel storage box, and the dosing sequence is controlled by solenoid valves (such as passivating heavy metals first and then degrading organic matter) to avoid chemical interference. This multi-channel synergy increases the remediation efficiency. A closed mechanism is combined with compressed gas pressurization to prevent the remediation agent from gushing out. An arc-shaped elastic rod and a conical sealing block are arranged at the nozzle outlet, which automatically closes when not spraying materials, reducing material waste. Integrating drill drive, material transportation, and gas pressurization into one, it has a smaller volume than traditional equipment. Automated operation realizes full-process automation of "drilling-remediation-backfilling", and can also be mounted on towing machinery. In addition to coastal areas, it is also applicable to complex scenarios such as farmland, tidal flats, and industrial polluted sites, and the remediation efficiency is not limited by soil types. At the same time, it avoids soil excavation, protects the ecology, and the land can be quickly reclaimed after remediation, combining high efficiency, economy and environmental friendliness, providing an innovative solution for the treatment of globally coastal composite polluted soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a schematic structural diagram of a preferred embodiment of a device and method for in-situ remediation of soil composites based on multi-channel cooperation of spiral drills provided by the present invention;

[0026] Figure 2 is Figure 1 a schematic internal structure diagram of the first box shown;

[0027] Figure 3 is Figure 2 a schematic enlarged view of the structure at A shown;

[0028] Figure 4 is Figure 3 a schematic internal structure diagram of the drill pipe shown;

[0029] Figure 5 is Figure 4 a schematic enlarged view of the structure at B shown;

[0030] Figure 6 is Figure 4 a schematic enlarged view of the structure at C shown;

[0031] Figure 7 The Figure 1 top view of the support frame structure shown;

[0032] Figure 8 The Figure 1 schematic structural diagram of the feeding mechanism shown.

[0033] Reference numerals in the figure: 1, support frame; 11, storage box; 12, connecting frame; 2, blanking mechanism; 21, feeding hose; 22, joint; 23, cylinder body; 24, turbine; 25, communicating pipe; 3, driving mechanism; 31, motor; 32, screw; 33, first box body; 34, first gear; 35, main gear; 36, second box body; 4, adjusting mechanism; 41, compression cylinder; 42, intake pipe; 43, exhaust pipe; 44, connecting pipe; 45, solenoid valve; 46, crank connecting rod; 47, piston; 48, clamping block; 49, support net; 410, clamping ball; 5, closing mechanism; 51, cover plate; 52, groove; 53, limiting block; 54, plug; 55, spring; 56, communicating groove; 6, drill bit; 61, drill rod; 62, blade; 63, spray head; 64, elastic rod; 65, sealing block; 66, chuck; 7, vibrating mechanism; 71, vibrating box; 72, second gear; 73, eccentric block; 74, rotating shaft. Detailed implementation manners

[0034] The present invention will be further described below in conjunction with the accompanying drawings and implementation manners.

[0035] Please refer to Figures 1 to 8 , Figure 1 which is a schematic structural diagram of a preferred embodiment of the soil composite in-situ repair device and method based on a multi-channel collaborative spiral drill bit provided by the present invention; Figure 2 The Figure 1 schematic diagram of the internal structure of the first box body shown; Figure 3 The Figure 2 enlarged schematic diagram of the structure at position A shown; Figure 4 The Figure 3 schematic diagram of the internal structure of the drill rod shown; Figure 5 The Figure 4 enlarged schematic diagram of the structure at position B shown; Figure 6 The Figure 4 enlarged schematic diagram of the structure at position C shown; Figure 7 The Figure 1 top view of the support frame structure shown; Figure 8 The Figure 1Schematic diagram of the feeding mechanism structure shown. Among them, the soil composite in-situ remediation device based on the multi-channel cooperation of spiral drills includes: a support frame 1, and a feeding mechanism 2 for conveying soil remediation materials is installed inside the support frame 1. The feeding mechanism 2 includes a cylinder body 23, and the side wall of the support frame 1 is installed with the cylinder body 23. A turbine 24 is rotatably connected inside the cylinder body 23; a motor 31 is installed on the side wall of the support frame 1, and the output shaft of the motor 31 is connected to the turbine 24; a plurality of communicating pipes 25 are installed at the center of the side wall of the cylinder body 23, and one communicating pipe 25 is installed on the side wall of each storage tank 11; a feeding hose 21 is installed on the side wall of the cylinder body 23, and a connector 22 is installed at one end of the feeding hose 21. In order to facilitate the motor 31 to drive the turbine 24 to rotate rapidly inside the cylinder body 23, thereby generating suction inside the communicating pipe 25, enabling the substances inside the storage tank 11 to enter the inside of the cylinder body 23, and as the turbine 24 rotates, it pushes the materials to be quickly discharged through the feeding hose 21.

[0036] A driving mechanism 3 at one end of the support frame 1 for driving the drill bit 6 to rotate and move up and down; According to the soil composite in-situ remediation device based on the multi-channel cooperation of spiral drills as claimed in claim 1, characterized in that the driving mechanism 3 includes a first box body 33 and a second box body 36. Motors 31 are installed on the side walls of the first box body 33 and the second box body 36. A first gear 34 and a main gear 35 are rotatably connected inside the first box body 33 and the second box body 36. The main gear 35 meshes with the first gear 34, and the main gear 35 is connected to the output shaft of the motor 31. In order that when the motor 31 operates to drive the main gear 35 to rotate, the main gear 35 drives the first gear 34 to rotate, and the diameter of the main gear 35 is much smaller than the diameter of the first gear 34, making it more labor-saving for the main gear 34 to drive the first gear 34 to rotate, facilitating the drill bit 6 to drill into the soil.

[0037] Inside the second box body 36, the first gear 34 is threadedly connected to a screw rod 32, and the bottom end of the screw rod 32 is fixedly connected to the first box body 33. A compression cylinder 41 is installed on the side wall of the first box body 33; inside the first box body 33, a chuck 66 is fixedly connected to the center of the first gear 34. The bottom end of the main gear 35 is installed with the crank connecting rod 46, and the crank connecting rod 46 is rotatably connected to the inside of the first box body 33. During the rotation of the first gear 34 inside the second box body 36, using the principle of screw drive, the first gear 34 drives the screw rod 32, the first box body 33 and the drill bit 6 to move up and down; when the first gear 34 inside the first box body 33 rotates, the first gear 34 drives the drill bit 6 to rotate, facilitating the drill bit 6 to enter the soil.

[0038] The vibration mechanism 7 includes a vibration box 71. Inside the vibration box 71, a rotating shaft 74 and a second gear 72 are rotatably connected. The second gear 72 meshes with the main gear 35 inside the second box body 36. At the center of the side wall of the rotating shaft 74, the second gear 72 is fixedly connected, and eccentric blocks 73 are symmetrically installed on the side wall of the rotating shaft 74. A connecting frame 12 is fixedly connected to the side wall of the support frame 1, and the vibration box 71 is installed on the side wall of the connecting frame 12. A plurality of storage boxes 11 are installed on the surface of the connecting frame 12. When the main gear 35 rotates, it drives the second gear 72 to rotate. The second gear 72 drives the rotating shaft 74 and the eccentric blocks 73 to continuously rotate. Due to the centrifugal force, the eccentric blocks 73 generate inertial excitation forces, thereby driving the vibration box 71 to vibrate continuously. The vibration box 71 drives the connecting frame 12 and the storage boxes 11 to vibrate continuously, so that the repair substances stored inside the storage boxes 11 vibrate continuously, avoiding the precipitation of the repair substances.

[0039] The drill bit 6 includes a rotating rod 61. The top end of the rotating rod 61 is fixed inside a chuck 66 by bolts. The top end of the chuck 66 is rotatably connected to a joint 22. Sealing rings are installed at the connection between the chuck 66 and the joint 22 and at the connection between the chuck 66 and the rotating rod 61 to increase the sealing performance of the connections. A spiral blade 62 is installed on the side wall of the rotating rod 61. A plurality of spray nozzles 63 are obliquely installed on the side wall of the rotating rod 61. Elastic rods 64 with arc-shaped side walls are symmetrically installed on the side walls of the spray nozzles 63. A conical sealing block 65 is installed at one end of the elastic rod 64, and the sealing block 65 is stuck at the outlet of the spray nozzle 63. The inner bottom end of the chuck 66 and the top end of the rotating rod 61 are both hexagonal prisms, facilitating the chuck 66 to drive the rotating rod 61 to rotate, and the chuck 66 is communicated with the rotating rod 61. When the chuck 66 and the rotating rod 61 rotate, the rotating rod 61 and the spiral blade 62 rotate continuously, facilitating the rotating rod 61 and the blade 62 to enter the soil. During this process, the sealing block 65 blocks part of the outlet of the spray nozzle 63, avoiding soil impurities from entering the inside of the spray nozzle 63 and blocking the spray nozzle 63.

[0040] A plurality of storage boxes 11 are mounted on the surface of the support frame 1, and a vibration mechanism 7 for driving the storage boxes 11 to vibrate continuously is mounted on the side wall of the driving mechanism 3; a closing mechanism 5 for preventing materials from gushing out is mounted at the top end of the drill bit 6; the closing mechanism 5 includes a cover plate 51, and the top end of the drill bit 6 is rotatably connected to the cover plate 51; the bottom end of the cover plate 51 is conical, and the top end of the cover plate 51 is inclined; an annular groove 52 is provided inside the cover plate 51, a plug 54 is slidably connected inside the groove 52, a limiting block 53 is mounted inside the groove 52, and the limiting block 53 abuts against the side wall of the plug 54; a plurality of springs 55 are mounted inside the groove 52, and one end of the spring 55 is connected to the plug 54; a plurality of communication grooves 56 are obliquely provided at the bottom end of the cover plate 51, and the top end of the communication groove 56 is slidably connected to the plug 54; an adjusting mechanism 4 for pressing materials into the soil is mounted on the side wall of the driving mechanism 3, and the adjusting mechanism 4 includes a compression cylinder 41, a piston 47 and a crank connecting rod 46 are slidably connected inside the compression cylinder 41, and the crank connecting rod 46 is rotatably connected to the piston 47; an exhaust pipe 43 and a curved intake pipe 42 are mounted on the side wall of the compression cylinder 41; the exhaust pipe 43 is communicated with the feeding mechanism 2 through a connecting pipe 44, and the exhaust pipe 43 is communicated with the inside of the groove 52; a support net 49 and a funnel-shaped block 48 are mounted inside the exhaust pipe 43 and the intake pipe 42, a ball 410 is clamped inside the block 48, and the ball 410 abuts against the support net 49; the block 48, the support net 49 and the ball 410 form a one-way valve, and the installation direction of the one-way valve inside the exhaust pipe 43 is opposite to the installation direction of the one-way valve inside the intake pipe 42; as the drill bit 6 enters the soil, the rotating head 6 drives the cover plate 51 into the soil. The bottom end of the cover plate 51 is conical, which is convenient for the cover plate 51 to enter the soil layer. The top end of the cover plate 51 is inclined to make the cover plate 51 be inserted into the soil obliquely, so as to close the top end of the drill hole formed by the drill bit 6 and prevent the repair material from gushing out. During this process, the plug 54 clamps the top end of the communication groove 56, and the top end of the communication groove 56 is inclined, so that soil effectively enters the inside of the communication groove 56 and blocks it; when the repair material is added to the soil through the spray head 63, at this time, the crank connecting rod 46 drives the piston 47 to move back and forth continuously inside the compression cylinder 41. When the piston 47 moves towards the direction of the crank connecting rod 46, the ball 410 inside the intake pipe 42 abuts against the support net 49, opening the intake pipe 42, and the ball 410 inside the exhaust pipe 43 clamps the block 48, closing the exhaust pipe 43, so that external air enters the inside of the compression cylinder 41 through the intake pipe 42;When the piston 47 moves away from the crank connecting rod 46, the clamping ball 410 inside the intake pipe 42 clamps the clamping block 48 to close the intake pipe 42, and the clamping ball 410 inside the exhaust pipe 43 abuts against the support net 49 to open the exhaust pipe 43, so that the gas inside the compression cylinder 41 is quickly compressed through the exhaust pipe 43 and enters the inside of the groove 52; at this time, the plug 54 is pushed by the gas to compress the spring 55 to open the communication groove 56, so that the gas quickly enters the drilling hole downward through the communication groove 56. At this time, the blade 62 rotates continuously to stir the soil, so that the soil and the repair substance are mixed evenly. At the same time, the air continuously moves downward into the moving soil. The air pushes the soil to move outward, increasing the stirring range of the soil. At the same time, it pushes the repair substance to move into the surrounding soil layers, increasing the repair range. At the same time, the repair substance and the soil are mixed evenly to prevent the repair substance from gushing upward.;

[0041] Solenoid valves 45 are installed on the side walls of the feed hose 21, the connecting pipe 25, the exhaust pipe 43, and the connecting pipe 44 to control the opening and closing of the feed hose 21, the connecting pipe 25, the exhaust pipe 43, and the connecting pipe 44 through the solenoid valves 45.

[0042] A soil composite in-situ repair method based on the multi-channel cooperation of a spiral drill bit specifically includes the following steps:

[0043] Step 1: According to the distribution depth of the pollutants, select a rotating rod 61 of an appropriate length, insert the rotating rod 61 into the inside of the chuck 66 and fix it with bolts; fix the support frame 1 on the towing machine. During soil repair, a hydroxyapatite suspension, an iron-based biochar bin, a composite bacterium agent mixture, and sodium acetate particles are respectively added to the inside of the storage tank 11; when repairing the soil, connect the device to an external power supply, and turn on the motors 31 on the side walls of the first box body 33 and the second box body 36. The operation of the motors 31 drives the main gear 35 to rotate, and the main gear 35 drives the first gear 34 to rotate; during the rotation of the first gear 34 inside the second box body 36, using the principle of screw transmission, the first gear 34 drives the screw rod 32, the first box body 33, and the drill bit 6 to move downward; the first gear 34 inside the first box body 33 rotates, and the first gear 34 drives the chuck 66 and the drill rod 61 to rotate. The rotating rod 61 and the spiral blade 62 rotate continuously, facilitating the entry of the rotating rod 61 and the blade 62 into the soil;

[0044] Step 2: During the process of the drill bit 6 drilling into the soil, open the solenoid valve 45 on the side wall of the connecting pipe 44 to connect the exhaust pipe 43 with the feed hose 21; when the main gear 35 rotates, the main gear 35 drives the crank-link 46 to continuously rotate, and the crank-link 46 drives the piston 47 to continuously move back and forth inside the compression cylinder 41. When the piston 47 moves towards the crank-link 46, the ball 410 inside the intake pipe 42 abuts against the support net 49 to open the intake pipe 42, and the ball 410 inside the exhaust pipe 43 engages with the block 48 to close the exhaust pipe 43, so that the outside air enters the inside of the compression cylinder 41 through the intake pipe 42; when the piston 47 moves away from the crank-link 46, the ball 410 inside the intake pipe 42 engages with the block 48 to close the intake pipe 42, and the ball 410 inside the exhaust pipe 43 abuts against the support net 49 to open the exhaust pipe 43, so that the gas inside the compression cylinder 41 passes through the exhaust pipe 43, the connecting pipe 44, the feed hose 21, the joint 22 and the chuck 66 and enters the inside of the rotating rod 61. The joint 22 is rotatably connected to the drill rod 61, and a sealing ring is installed at the connection between the two to maintain the sealing of the connection between the joint 22 and the rotating rod 61. The airtight door leaks air, and the gas continuously enters the inside of the drill rod 61 and then sprays outwards through the nozzle 63. During the process of the nozzle 63 entering the soil, it continuously sprays air outwards, thereby preventing the nozzle 63 from being blocked by the soil.

[0045] Step 3: As the drill bit 6 enters the soil layer, the rotating head 6 drives the cover plate 51 into the soil. The bottom end of the cover plate 51 is conical, facilitating the entry of the cover plate 51 into the soil layer. And the top end of the cover plate 51 is inclined so that the cover plate 51 is inserted into the soil obliquely to seal the top end of the borehole formed by the drill bit 6. Close the motor 31 on the side wall of the second box body 36, and open the motor 31 on the side wall of the first box body 33 to make the rotating head 6 rotate in place in the soil. Open the solenoid valves 45 on the side wall of the communication pipe 25 corresponding to the hydroxyapatite suspension, the solenoid valves 45 on the side wall of the feed hose 21, and the solenoid valves 45 on the side wall of the exhaust pipe 43, and close the other solenoid valves 45. At the same time, open the motor 31 on the side wall of the cylinder body 23. The motor 31 drives the turbine 24 to rotate rapidly inside the cylinder body 23, thereby generating suction inside the communication pipe 25, causing the hydroxyapatite suspension in the storage tank 11 to enter the inside of the cylinder body 23. As the turbine 24 rotates, it pushes the hydroxyapatite suspension to quickly discharge through the feed hose 21 and enter the inside of the drill pipe 61. The hydroxyapatite suspension is quickly ejected through the spray head 63 to squeeze the sealing block 65. The sealing block 65 stretches the elastic rod 64 with an arc-shaped side wall, increasing the distance between the sealing block 65 and the spray head 63, increasing the outlet of the spray head 63. And the hydroxyapatite suspension enters the soil along the conical sealing block 65. The hydroxyapatite suspension disperses on the side wall of the sealing block 65, increasing the spraying area of the hydroxyapatite suspension, facilitating the passivation of heavy metals in the soil layer by the hydroxyapatite suspension;

[0046] Heavy metal passivation principle:

[0047] Hydroxyapatite (Ca 10 (PO4)6(OH)2) interaction mechanism with heavy metals:

[0048] Fix heavy metals: Through ion exchange (Ca 2+ and Cd 2+ / Pb 2+ replacement) and surface adsorption to form stable precipitates (such as Cd5(PO4)3(OH));

[0049] Ca 10 (PO4)6(OH)2 + 3Cd 2+ →Cd3(PO4)2↓ + 10Ca 2+ + 2OH -

[0050] When adding the hydroxyapatite suspension into the soil through the nozzle 63, the gas inside the compression cylinder 41 is quickly compressed through the exhaust pipe 43 and enters the inside of the groove 52; at this time, the plug 54 is pushed by the gas to compress the spring 55, opening the communication groove 56, so that the gas quickly enters the inside of the drilling hole downward through the communication groove 56. At this time, the blade 62 rotates continuously to stir the soil, making the soil and the repair substance evenly mixed. At the same time, the air continuously moves downward into the moving soil, and the air pushes the soil to move outward, increasing the stirring range of the soil. At the same time, it pushes the hydroxyapatite suspension to move into the surrounding soil layers, increasing the repair range. At the same time, it mixes the repair substance and the soil evenly. The cover plate 51 seals the top of the drilling hole and continuously conveys compressed gas downward, preventing the hydroxyapatite suspension from gushing upward, increasing the movement range of the hydroxyapatite suspension in the soil, accelerating the effect of the hydroxyapatite suspension, and accelerating the cleaning of heavy metals in the soil; at the same time, when the spraying of the hydroxyapatite suspension is completed, similarly, open the solenoid valve 45 on the side wall of the communication pipe 25 corresponding to the iron-based biochar bin, the solenoid valve 45 on the side wall of the feed hose 21, and the solenoid valve 45 on the side wall of the exhaust pipe 43, close the other solenoid valves 45, and add the iron-based biochar bin into the soil layer. The Fe3O4 nanoparticles (10 - 50nm) in the iron-based biochar bin produce a magnetic capture effect to adsorb negatively charged microplastics (PE, PP); when the spraying of the iron-based biochar bin is completed, similarly, open the solenoid valve 45 on the side wall of the communication pipe 25 corresponding to the complex bacterium agent mixture and sodium acetate particles, the solenoid valve 45 on the side wall of the feed hose 21, and the solenoid valve 45 on the side wall of the exhaust pipe 43, close the other solenoid valves 45, and add the complex bacterium agent mixture and sodium acetate particles into the soil to promote anaerobic microbial degradation; the complex bacterium agent mixture contains sulfate-reducing bacteria, Dehalococcoides and other strains, and the principle is as follows

[0051] Sulfate-reducing bacteria (SRB): Under anaerobic conditions, reduce sulfate (SO4 2- ) to sulfide (S 2- ): SO4 2- + 8e - + 8H + → S 2- + 4H2O

[0052] Dehalococcoides: Degrade chlorinated organic compounds (such as PCBs, TCE) through reductive dechlorination: C2HCl3 + H2 → C2H2Cl2 + HCl

[0053] Depend on the coupling of hydrogenase and cytochrome c electron transfer chain, release sodium acetate as an electron acceptor, and accelerate the microbial reduction efficiency;

[0054] During the process of soil remediation, first spray hydroxyapatite to passivate heavy metals and reduce the heavy metals in the soil, then spray iron-based biochar bins to adsorb microplastics, and finally spray a composite bacterial agent mixture and sodium acetate particles to degrade organic pollutants by microorganisms. The passivation of hydroxyapatite reduces soil heavy metals, which is beneficial to the reproduction of microorganisms. The iron-based biochar bins provide attachment points for the reproduction of microorganisms, accelerating the reproduction efficiency of microorganisms and the soil remediation efficiency. Moreover, this device can select rotors of different lengths according to the distribution depth of pollutants, and spray the remediation substances into the soil where the pollutants are located through the rotors for targeted remediation, so as to facilitate the targeted remediation of pollutants at different depths and improve the remediation effect.

[0055] To sum up, the advantages and beneficial effects of the present invention are as follows: Through a multi-channel collaborative remediation mechanism, combined with deep stirring by a spiral drill bit and gas-assisted diffusion technology, the present invention realizes the in-situ synchronous treatment of heavy metal, organic matter and microplastic compound pollution. First, spray hydroxyapatite to passivate heavy metals and reduce the heavy metals in the soil, then spray iron-based biochar bins to adsorb microplastics, and finally spray a composite bacterial agent mixture and sodium acetate particles to degrade organic pollutants by microorganisms. The passivation of hydroxyapatite reduces soil heavy metals, which is beneficial to the reproduction of microorganisms. The iron-based biochar bins provide attachment points for the reproduction of microorganisms, accelerating the reproduction efficiency of microorganisms and the soil remediation efficiency.

[0056] By rotating and stirring with spiral blades and laterally diffusing compressed gas, the mixing uniformity of the remediation agent and the soil is improved. Different remediation agents are separately packed in a multi-channel storage box, and the dosing sequence is controlled by electromagnetic valves (such as passivating heavy metals first and then degrading organic matter) to avoid chemical interference. This multi-channel synergistic effect improves the remediation efficiency.

[0057] Adopt a closed mechanism combined with compressed gas pressurization. An arc-shaped elastic rod and a conical sealing block are arranged at the outlet of the nozzle, which is automatically closed when not spraying materials, reducing material waste.

[0058] Integrating drill bit drive, material transportation, and gas pressurization, it has a smaller volume than traditional equipment. The automated operation realizes the full-process automation of "drilling - remediation - backfilling". It can also be mounted on towing machinery. In addition to coastal areas, it is also applicable to complex scenarios such as farmland, tidal flats, and industrial polluted sites. The remediation efficiency is not limited by soil types. At the same time, it avoids soil excavation, protects the ecology, and the land can be quickly reclaimed after remediation, combining high efficiency, economy and environmental friendliness, providing an innovative solution for the treatment of global coastal composite polluted soil.

[0059] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A soil composite in-situ remediation device based on multi-channel cooperation of a spiral drill bit, characterized in that, Comprising: A support frame (1), inside which a blanking mechanism (2) for conveying soil remediation materials is installed, and a driving mechanism (3) at one end of the support frame (1) for driving a drill bit (6) to rotate and move up and down; A plurality of storage boxes (11) are installed on the surface of the support frame (1), and a vibration mechanism (7) for driving the storage boxes (11) to vibrate continuously is installed on the side wall of the driving mechanism (3); A closing mechanism (5) for preventing materials from gushing out is installed at the top end of the drill bit (6); The closing mechanism (5) includes a cover plate (51), and the top end of the drill bit (6) is rotatably connected to the cover plate (51); The bottom end of the cover plate (51) is conical, and the top end of the cover plate (51) is inclined; An annular groove (52) is provided inside the cover plate (51), a plug (54) is slidably connected inside the groove (52), a limiting block (53) is installed inside the groove (52), and the limiting block (53) abuts against the side wall of the plug (54); A plurality of springs (55) are installed inside the groove (52), and one end of the spring (55) is connected to the plug (54); A plurality of communication grooves (56) are inclined at the bottom end of the cover plate (51), and the top end of the communication groove (56) is slidably connected to the plug (54); An adjusting mechanism (4) for pressing materials into the soil is installed on the side wall of the driving mechanism (3), the adjusting mechanism (4) includes a compression cylinder (41), a piston (47) and a crank connecting rod (46) are slidably connected inside the compression cylinder (41), and the crank connecting rod (46) is rotatably connected to the piston (47); An exhaust pipe (43) and a curved intake pipe (42) are installed on the side wall of the compression cylinder (41); The exhaust pipe (43) is communicated with the blanking mechanism (2) through a communicating pipe (44), and the exhaust pipe (43) is communicated with the inside of the groove (52); Support meshes (49) and internally funnel-shaped blocks (48) are installed inside the exhaust pipe (43) and the intake pipe (42), a ball (410) is clamped inside the block (48), and the ball (410) abuts against the support mesh (49); The block (48), the support mesh (49) and the ball (410) form a one-way valve, and the installation direction of the one-way valve inside the exhaust pipe (43) is opposite to the installation direction of the one-way valve inside the intake pipe (42).

2. The soil composite in-situ remediation device based on the multi-channel cooperation of a helical drill bit according to claim 1, characterized in that, The driving mechanism (3) includes a first box body (33) and a second box body (36). Motors (31) are installed on the side walls of the first box body (33) and the second box body (36). A first gear (34) and a main gear (35) are rotatably connected inside the first box body (33) and the second box body (36). The main gear (35) meshes with the first gear (34), and the main gear (35) is connected to the output shaft of the motor (31), and the diameter of the main gear (35) is much smaller than the diameter of the first gear (34).

3. The soil composite in-situ remediation device based on the multi-channel cooperation of a spiral drill bit according to claim 2, wherein, A compression cylinder (41) is installed on the side wall of the first box body (33); inside the first box body (33), a drill bit (6) is fixedly connected to the center of the inside of the first gear (34), the bottom end of the main gear (35) is installed with the crank connecting rod (46), and the crank connecting rod (46) is rotatably connected to the inside of the first box body (33).

4. The soil composite in-situ remediation device based on multi-channel cooperation of a spiral drill bit according to claim 3, wherein Inside the second box body (36), the first gear (34) is threadedly connected to the screw rod (32), and the bottom end of the screw rod (32) is fixedly connected to the first box body (33).

5. The soil composite in-situ remediation device based on multi-channel cooperation of a spiral drill bit according to claim 4, characterized in that, The vibration mechanism (7) includes a vibration box (71), inside the vibration box (71), a rotating shaft (74) and a second gear (72) are rotatably connected, and the second gear (72) meshes with the main gear (35) inside the second box body (36); the second gear (72) is fixedly connected to the center of the side wall of the rotating shaft (74), and eccentric blocks (73) are symmetrically installed on the side wall of the rotating shaft (74).

6. The soil composite in-situ remediation device based on the multi-channel cooperation of a spiral drill bit according to claim 5, characterized in that, A connecting frame (12) is fixedly connected to the side wall of the support frame (1), and a vibration box (71) is installed on the side wall of the connecting frame (12), and a plurality of storage boxes (11) are installed on the surface of the connecting frame (12).

7. The soil composite in-situ remediation device based on the multi-channel cooperation of a helical drill bit according to claim 6, characterized in that, The feeding mechanism (2) includes a cylinder body (23), the cylinder body (23) is installed on the side wall of the support frame (1), and a turbine (24) is rotatably connected inside the cylinder body (23); a motor (31) is installed on the side wall of the support frame (1), and the output shaft of the motor (31) is connected to the turbine (24); a plurality of communicating pipes (25) are installed at the center of the side wall of the cylinder body (23), and one communicating pipe (25) is installed on the side wall of each storage box (11); a feeding hose (21) is installed on the side wall of the cylinder body (23), and a joint (22) is installed at one end of the feeding hose (21).

8. The soil composite in-situ remediation device based on the multi-channel cooperation of a spiral drill bit according to claim 7, characterized in that, Solenoid valves (45) are installed on the side walls of the feeding hose (21), the communicating pipe (25), the exhaust pipe (43), and the connecting pipe (44).

9. The soil composite in-situ remediation device based on multi-channel cooperation of a spiral drill bit according to claim 8, characterized in that, The drill bit (6) includes a rotating rod (61), the top end of the rotating rod (61) is fixed inside a chuck (66) by bolts, the top end of the chuck (66) is rotatably connected to the joint (22), and spiral blades (62) are installed on the side wall of the rotating rod (61); a plurality of spray heads (63) are obliquely installed on the side wall of the rotating rod (61), elastic rods (64) with arc-shaped side walls are symmetrically installed on the side wall of the spray heads (63), a conical sealing block (65) is installed at one end of the elastic rod (64), and the sealing block (65) is stuck at the outlet of the spray head (63).

10. The soil composite in-situ remediation device based on multi-channel cooperation of a spiral drill bit according to claim 9, characterized in that, It includes a method for soil composite in-situ remediation based on multi-channel cooperation of a spiral drill bit, specifically including the following steps: Step 1: Fix the support frame (1) on a towing machine. During soil remediation, a hydroxyapatite suspension, an iron-based biochar bin, a composite bacterium agent mixture, and sodium acetate particles are respectively added into the storage boxes (11); when remediating the soil, connect the device to an external power supply, and turn on the driving mechanism (3) to make the drill bit (6) enter the soil; Step 2: During the process of the drill bit (6) drilling into the soil, the gas inside the compression cylinder (41) continuously enters the inside of the drill bit (6) and then sprays out through the spray head (63). The spray head (63) continuously sprays out gas during the process of entering the soil, thereby preventing the spray head (63) from being blocked by the soil. Step 3: As the drill bit (6) enters the soil layer, the rotating head (6) drives the cover plate (51) into the soil, and the top of the hole drilled by the cover plate (51) is sealed; the feeding mechanism (2) is opened, and the hydroxyapatite suspension, iron-based biochar bin, composite microbial agent mixture, and sodium acetate particles are successively sprayed into the soil; during the process of spraying the repair substances, the gas inside the compression cylinder (41) enters the inside of the groove (52) through the exhaust pipe (43), and the gas quickly enters the inside of the drill hole downward through the communication groove (56). At this time, the blade (62) continuously rotates to stir the soil, so that the soil and the repair substances are evenly mixed. At the same time, the air continuously moves downward into the moving soil, and the air pushes the soil to move outward, increasing the stirring range of the soil. At the same time, the air pushes the repair substances to move into the surrounding soil layers, increasing the repair range. At the same time, the repair substances and the soil are evenly mixed. The cover plate (51) seals the top of the drill hole and continuously conveys compressed gas downward, preventing the repair substances from gushing upward. At the same time, the movement range of the repair substances in the soil is increased, providing the soil repair effect.

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