Device and process for coupled in-situ remediation of heavy metal contaminated soil

Abstract

The invention discloses a device and a process for coupled in-situ remediation of heavy metal contaminated soil, and relates to the field of soil remediation. The coupled in-situ remediation device and process for the heavy metal contaminated soil comprise a supporting frame, a stirring unit, a smashing unit, a conveying unit and a conveyor. According to the coupled in-situ remediation device and process for the heavy metal contaminated soil, the stirring mechanism mixes an agent and the soil, the soil is mixed and stirred under rotation of the overturning blades, meanwhile, under the action of the overturning blades, the soil is overturned and conveyed, the soil in the stirring barrel is conveyed through the conveying seat, the soil is quantitatively conveyed into the conveyor, and the conveying efficiency is improved. At the moment, the conveying amount is limited, the soil thickness is the same, spraying and mixing are conducted in cooperation with a spraying pipe, the proportion of the soil and spraying liquid is in a proper range, the soil treatment effect is improved, meanwhile, waste of agents is effectively avoided, and residues of unconsumed agents in the soil are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and in particular to a coupled in-situ remediation device and process for heavy metal contaminated soil. Background Art

[0002] Soil remediation is a technical system that uses physical, chemical or biological means to treat contaminated soil, reduce the concentration of pollutants or convert them into harmless substances, and restore ecological functions and production capacity.

[0003] Currently, during soil remediation, mechanical stirring is used to uniformly mix the remediation agent with the deep soil to ensure direct contact between the agent and the pollutants, and then the soil is sprayed with the agent to perform secondary degradation of pollutants that have not been thoroughly treated on the surface. However, in the existing technology, the remediation agent and the soil are mixed according to a ratio, but when the agent is sprayed, the ratio of the sprayed agent to the soil cannot be effectively controlled. In order to ensure the treatment of the soil, a sufficient amount of agent is usually required to be sprayed, which leads to waste of the agent, and too much agent is in the soil, causing the agent to affect the normal use of the soil. Therefore, we propose a coupled in-situ remediation device and process for heavy metal contaminated soil. Summary of the Invention

[0004] In response to the shortcomings of the existing technology, the present invention provides a coupled in-situ remediation device and process for heavy metal contaminated soil, which solves the problem in the existing technology that the remediation agent and soil are mixed according to a ratio, but the ratio of the sprayed agent to the soil cannot be effectively controlled when the agent is sprayed. In order to ensure the treatment of the soil, a sufficient amount of agent is usually required to be sprayed, which leads to waste of agent, and too much agent remains in the soil, causing the agent to affect the normal use of the soil.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a coupled in-situ remediation device and process for heavy metal contaminated soil, comprising: Support frame; A stirring unit is installed in the support frame. The stirring unit is connected to a plurality of stirring mechanisms. The stirring mechanisms are provided with a plurality of groups of flip blades, which stir the soil. A crushing unit is mounted on a support frame, the support frame is located directly above the mixing unit, and the crushing unit is used to crush the soil; A conveying unit is installed in the support frame and is installed below the stirring unit. The conveying unit is provided with a conveying seat and a spraying pipe. The conveying seat is used to convey soil, and the spraying pipe is used to spray the agent. The conveyor is arranged on one side of the support frame, the conveying unit is located above the conveyor, and the conveyor is used to transport soil.

[0006] Preferably, the crushing unit comprises: A crushing frame, with a discharge port provided below it, which is connected to the interior of the stirring unit; A mounting bracket fixedly connected to the outer peripheral wall of the crushing frame, wherein the mounting bracket is mounted on the supporting frame; A plurality of crushing shafts are rotatably connected to the crushing frame, and a synchronous belt is connected between the plurality of crushing shafts for driving the plurality of crushing shafts to rotate simultaneously; The pulverizing motor is installed on one side of the pulverizing frame, and the output end of the pulverizing motor is connected to one end of the pulverizing shaft.

[0007] Preferably, a mounting frame is provided on one side of the support frame, a stirring motor is installed on the mounting frame, the output end of the stirring motor is connected to one of the stirring mechanisms, the stirring unit includes a stirring drum and a protective frame, the stirring mechanism is rotatably connected in the stirring drum, a discharge port is provided below the stirring drum, a synchronous pulley is connected for transmission between several of the stirring mechanisms, the protective frame is installed on the outer wall of the stirring drum, and the protective frame is sleeved on the outer peripheral wall of the stirring mechanism.

[0008] Preferably, the stirring mechanism comprises: a stirring rod rotatably connected to the mixing drum; A plurality of rotating rods are rotatably connected to the stirring rod, and a transmission assembly is provided between the plurality of rotating rods for driving the plurality of rotating rods to rotate simultaneously; A plurality of flip blades are sleeved on the outer peripheral wall of the rotating rod; The rotating assembly is located in the stirring rod and is in transmission connection with the corresponding rotating rod. The rotating assembly is used to drive the corresponding rotating rod to rotate.

[0009] Preferably, the transmission assembly includes a first transmission wheel and a second transmission wheel, the first transmission wheel and the second transmission wheel are sleeved on the outer peripheral wall of the rotating rod, and the first transmission wheel and the second transmission wheel are fixedly connected, and the second transmission wheel and the first transmission wheel are provided with a transmission belt, and the outer peripheral wall of the stirring rod is installed with a protective frame, and the protective frame is sleeved on the outer peripheral wall of the transmission assembly.

[0010] Preferably, the rotating assembly includes: A connecting rod is rotatably connected to the stirring rod, one end of the stirring rod is provided with a connecting plate, the connecting plate is mounted on the connecting rod, one end of the connecting plate is provided with a mounting seat, and the mounting seat is mounted on the outer wall of the mixing drum; a first bevel gear, which is sleeved on the outer peripheral wall of the connecting rod; A plurality of second bevel gears are sleeved on the outer peripheral walls of the corresponding rotating rods, and the second bevel gears are meshed with the first bevel gears.

[0011] Preferably, the conveying unit includes: A conveying frame is mounted on the support frame, and the conveying frame is arranged on the outer peripheral wall of the stirring unit; A mounting plate is provided on the outer peripheral wall of the conveying frame, and the mounting plate is fixedly mounted on the mounting seat; A connecting seat is provided in the conveying frame, the connecting seat is located at the discharge port of the mixing drum, the conveying seat is rotatably connected to the conveying frame, and the output end of the conveying frame is connected to a driving motor; A plurality of material conveying troughs are provided in the material conveying seat, and the material conveying troughs are located above the conveyor.

[0012] Preferably, the bottom of the connecting seat is provided with an inclined surface, which is used to flatten the soil. The spraying pipe is installed on the conveying frame. The spraying pipe is connected to a liquid inlet, and the spraying pipe is connected to the repair liquid through the liquid inlet and the liquid inlet pipe.

[0013] Preferably, the method comprises the following steps: S1: Pour the soil to be remediated into the crushing unit. Under the action of the crushing shaft in the crushing unit, the clay blocks in the soil are broken. At the same time, the filter screen in the crushing frame filters out stones and debris to ensure that the agent is in full contact with the contaminated soil. At the same time, the agent is added to the mixing unit in proportion. S2: At this time, the soil enters the mixing unit through the crushing unit. The mixing motor is started to drive the mixing unit for mechanical mixing, so that the remediation agent and the soil are evenly mixed, ensuring direct contact between the agent and the pollutants. The remediation agent includes a curing agent. After stirring, the curing agent forms a stable network structure, encapsulating heavy metals and reducing their mobility. The stirring process optimizes the soil aggregate structure, increases porosity, and enhances water and fertilizer retention capacity, creating favorable conditions for subsequent spraying; S3: Under the stirring of the stirring mechanism, the soil in the mixing drum is stirred evenly, and at the same time, the flip blade rotates on the stirring rod to turn the soil and push the soil to the discharge port. Under the action of the conveying unit, the soil is quantitatively transported under the rotation of the conveying seat, so that the soil is transported to the conveyor for transmission; S4: At this time, the spray pipe sprays chemicals to carry out secondary degradation of pollutants that have not been thoroughly treated on the surface. Spraying chemicals containing microorganisms can form an active barrier on the surface, continuously decompose residual pollutants and inhibit the reproduction of pathogens. Spraying adjuvants can reduce the adhesion between pollutants and soil particles, and assist in the further desorption of residual pollutants after stirring.

[0014] The present invention discloses a coupled in-situ remediation device and process for heavy metal contaminated soil, which has the following beneficial effects: 1. The coupled in-situ remediation device and process for heavy metal contaminated soil is characterized in that the agent is put into a mixing drum, and the stirring mechanism rotates in the mixing drum to mix the agent and soil. At the same time, the soil is further mixed and stirred under the rotation of the flip blade. At the same time, the soil is flipped and transported under the action of the flip blade. When the soil is flipped and transported, its transport speed depends on the rotation of the flip blade, thereby ensuring a uniform transport speed, avoiding soil accumulation at the transport unit, and affecting the quantitative transport of the soil to the conveyor.

[0015] 2. The coupled in-situ remediation device and process for heavy metal contaminated soil rotates through the conveying seat. Under the rotation of the conveying seat, the soil in the mixing drum is transported and quantitatively transported to the conveyor. At this time, the conveying volume is limited, the soil thickness is the same, and the spraying and mixing are carried out in conjunction with the spraying pipe, so that the ratio of soil and spraying liquid is within an appropriate range, thereby improving the treatment effect on the soil, effectively avoiding the waste of chemicals, and reducing the residue of unconsumed chemicals in the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the crushing unit of the present invention; Figure 3 Schematic diagram of the stirring unit structure of the present invention; Figure 4 Schematic diagram of the internal structure of the stirring unit of the present invention; Figure 5 This is a schematic structural diagram of the stirring mechanism of the present invention; Figure 6 It is a schematic structural diagram of the transmission assembly and the rotating assembly of the present invention; Figure 7 It is a schematic diagram of the structure of the conveying unit of the present invention.

[0018] In the figure: 1. Support frame; 11. Mounting frame; 2. Stirring unit; 21. Stirring drum; 22. Stirring mechanism; 221. Stirring rod; 222. Rotating rod; 223. Flip blade; 224. Transmission assembly; 2241. First transmission wheel; 2242. Second transmission wheel; 2243. Transmission belt; 225. Rotating assembly; 2251. Connecting rod; 2252. First bevel gear; 2253. Second bevel gear; 226. Protective frame; 23. Protective frame; 3. Crushing unit; 31. Crushing frame; 32. Mounting bracket; 33. Crushing shaft; 34. Crushing motor; 4. Stirring motor; 5. Conveying unit; 51. Conveying frame; 52. Mounting plate; 53. Connecting seat; 54. Feeding seat; 55. Feeding trough; 56. Spraying pipe; 6. Mounting seat; 61. Connecting plate; 7. Conveyor. DETAILED DESCRIPTION

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] The embodiment of the present application provides a coupled in-situ remediation device and process for heavy metal contaminated soil, which solves the problem in the prior art that the remediation agent and soil are mixed according to a ratio, but the ratio of the sprayed agent to the soil cannot be effectively controlled when the agent is sprayed. In order to ensure the treatment of the soil, it is usually necessary to spray a sufficient amount of agent, which leads to a waste of the agent, and too much agent is in the soil, causing the agent to affect the normal use of the soil. The invention realizes that the agent is put into the mixing drum 21, and the mixing mechanism 22 is rotated in the mixing drum 21 to mix the agent and the soil. At the same time, the soil is further mixed and stirred under the rotation of the flip blade 223. At the same time, the soil is flipped and transported under the action of the flip blade 223. When the soil is flipped and transported, its transport speed depends on the rotation of the flip blade 223, thereby ensuring a uniform transport speed, avoiding the accumulation of soil at the transport unit 5 and affecting the quantitative transport of the soil to the conveyor 7. The conveying seat 54 is rotated, and the soil in the mixing drum 21 is transported under the rotation of the conveying seat 54, and the soil is quantitatively transported to the conveyor 7. At this time, the conveying amount is limited, the soil thickness is the same, and the spraying and mixing are carried out in conjunction with the spraying pipe 56, so that the ratio of soil and spray liquid is within an appropriate range, thereby improving the treatment effect on the soil, effectively avoiding the waste of medicine, and reducing the residue of unconsumed medicine in the soil.

[0021] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0022] The embodiment of the present invention discloses a coupled in-situ remediation device and process for heavy metal contaminated soil.

[0023] Example 1: According to the attached Figure 1-7 Shown, including: Support frame 1; A stirring unit 2 is installed in the support frame 1. The stirring unit 2 is connected to a plurality of stirring mechanisms 22. The stirring mechanisms 22 are provided with a plurality of groups of flip blades 223. The flip blades 223 stir the soil. Specifically disclosed is that the medicine is put into the mixing drum 21, and the stirring mechanism 22 rotates in the mixing drum 21 to mix the medicine and the soil. At the same time, the soil is further mixed and stirred under the rotation of the flip blade 223. At the same time, the soil is flipped and transported under the action of the flip blade 223. When the soil is flipped and transported, its transport speed depends on the rotation of the flip blade 223, thereby ensuring a uniform transport speed, avoiding soil accumulation at the transport unit 5, which affects the quantitative transport of the soil to the conveyor 7. The crushing unit 3 is mounted on the support frame 1, which is directly above the mixing unit 2. The crushing unit 3 is used to crush the soil. The crushing unit 3 crushes the clay blocks and filters out the stones and debris to ensure that the agent is in full contact with the contaminated soil. The conveying unit 5 is installed in the support frame 1 and is installed below the stirring unit 2. The conveying unit 5 is provided with a conveying seat 54 and a spraying pipe 56. The conveying seat 54 is used to convey soil, and the spraying pipe 56 is used to spray the agent. It is particularly disclosed that the soil in the mixing drum 21 is transported by rotating the feeding seat 54, and the soil is quantitatively transported to the conveyor 7. At this time, the transport volume is limited, the soil thickness is the same, and the spraying and mixing are carried out in conjunction with the spraying pipe 56, so that the ratio of soil and spraying liquid is within an appropriate range, thereby improving the treatment effect on the soil, effectively avoiding the waste of medicines, and reducing the residue of unconsumed medicines in the soil.

[0024] The conveyor 7 is arranged on one side of the support frame 1, and the conveying unit 5 is located above the conveyor 7. The conveyor 7 is used to transport soil. The conveyor 7 is an existing mature structure and will not be elaborated on in this application.

[0025] It is important to emphasize that pollutants are removed by transferring the soil to a thermal desorption device. Using a gas or electric heater in direct contact with the soil, the device heats the soil to temperatures of 300–600°C, vaporizing and separating volatile or semi-volatile organic pollutants and rapidly decomposing the organic matter. The exhaust gas is then rendered harmless through incineration or adsorption treatment. Indirect heat transfer is achieved through closed equipment such as rotary kilns and screw conveyors, with a temperature range of 200–400°C. It is suitable for combined pollution of heavy metals and organic matter, avoiding secondary pollution caused by direct combustion. The treated soil can be safely reused.

[0026] Crushing unit 3 includes: The crushing frame 31 has a discharge port at its bottom, which is connected to the interior of the stirring unit 2; A mounting bracket 32, which is fixedly connected to the outer peripheral wall of the crushing frame 31, and the mounting bracket 32 is installed on the support frame 1; A plurality of crushing shafts 33 are rotatably connected to the crushing frame 31. A synchronous belt is connected between the crushing shafts 33 to drive the crushing shafts 33 to rotate simultaneously. A synchronous pulley is installed on the outer peripheral wall of the crushing shaft 33, and the winding direction of the synchronous belt on the two synchronous pulleys is non-parallel, that is, twisted into an "8" shape, so that several crushing shafts 33 rotate in opposite directions, thereby improving the crushing effect of the soil.

[0027] The pulverizing motor 34 is mounted on one side of the pulverizing frame 31 , and an output end of the pulverizing motor 34 is connected to one end of the pulverizing shaft 33 .

[0028] The crushing motor 34 is started to drive the crushing shaft 33 to rotate, and the clay blocks are crushed under the rotation of the crushing shafts 33.

[0029] A mounting frame 11 is provided on one side of the support frame 1, and a stirring motor 4 is installed on the mounting frame 11. The output end of the stirring motor 4 is connected to one of the stirring mechanisms 22. The stirring unit 2 includes a stirring drum 21 and a protective frame 23. The stirring mechanism 22 is rotatably connected to the stirring drum 21. A discharge port is provided below the stirring drum 21. Several stirring mechanisms 22 are connected for transmission with synchronous pulleys. The protective frame 23 is installed on the outer wall of the stirring drum 21, and the protective frame 23 is sleeved on the outer peripheral wall of the stirring mechanism 22.

[0030] The stirring mechanism 22 includes: A stirring rod 221 rotatably connected to the stirring drum 21; A plurality of rotating rods 222 are rotatably connected to the stirring rod 221. A transmission assembly 224 is provided between the plurality of rotating rods 222 to drive the plurality of rotating rods 222 to rotate simultaneously. A plurality of flip blades 223, which are sleeved on the outer peripheral wall of the rotating rod 222; The rotating assembly 225 is located in the stirring rod 221 . The rotating assembly 225 is in transmission connection with the corresponding rotating rod 222 . The rotating assembly 225 is used to drive the corresponding rotating rod 222 to rotate.

[0031] The transmission assembly 224 includes a first transmission wheel 2241 and a second transmission wheel 2242. The first transmission wheel 2241 and the second transmission wheel 2242 are sleeved on the outer peripheral wall of the rotating rod 222, and the first transmission wheel 2241 and the second transmission wheel 2242 are fixedly connected. A transmission belt 2243 is provided on the second transmission wheel 2242 and the first transmission wheel 2241. A protective frame 226 is installed on the outer peripheral wall of the stirring rod 221, and the protective frame 226 is sleeved on the outer peripheral wall of the transmission assembly 224.

[0032] It should be particularly emphasized that the transmission belt 2243 is engaged with the two adjacent second transmission wheels 2242, and one of the second transmission wheels 2242 is engaged with the corresponding fixedly connected first transmission wheel 2241 and the other transmission belt 2243. The transmission belt 2243 is engaged with the adjacent first transmission wheel 2241. When the rotating rod 222 rotates, it drives the first transmission wheel 2241 and the second transmission wheel 2242 to rotate. At this time, the first transmission wheel 2241 and the second transmission wheel 2242 rotate, driving the second transmission wheel 2242 to rotate.

[0033] Furthermore, at this time, the second transmission wheel 2242 drives the transmission belt 2243 or the first transmission wheel 2241 to rotate, thereby causing the rotating rod 222 to rotate, driving the plurality of rotating rods 222 to rotate, causing the flip blades 223 sleeved on the outer peripheral wall of the rotating rod 222 to rotate accordingly. At this time, the flip blades 223 rotate on the stirring rod 221 to flip and transport the soil; Furthermore, at the same time, under the action of the stirring motor 4, the stirring rod 221 is driven to rotate, and under the rotation of the stirring rod 221, the flip blade 223 is driven to rotate accordingly, and then under the action of the flip blade 223, the soil is stirred, and the soil and the agent are stirred.

[0034] The rotating assembly 225 includes: The connecting rod 2251 is rotatably connected to the stirring rod 221. A connecting plate 61 is provided at one end of the stirring rod 221. The connecting plate 61 is mounted on the connecting rod 2251. A mounting seat 6 is installed at one end of the connecting plate 61. The mounting seat 6 is mounted on the outer wall of the mixing drum 21. The connecting plate 61 is fixed by the mounting base 6. Under the action of the connecting plate 61, the connecting rod 2251 is fixed. When the stirring rod 221 rotates, the stirring rod 221 rotates relative to the connecting rod 2251. The first bevel gear 2252 is sleeved on the outer peripheral wall of the connecting rod 2251; A plurality of second bevel gears 2253 are sleeved on the outer peripheral walls of the corresponding rotating rods 222 , and the second bevel gears 2253 are meshed with the first bevel gears 2252 .

[0035] It should be particularly emphasized that when the stirring rod 221 rotates under the action of the stirring motor 4, the stirring rod 221 rotates and drives the rotating rod 222 to rotate relative to the connecting rod 2251. At this time, the rotating rod 222 drives the second bevel gear 2253 to rotate, so that the second bevel gear 2253 rotates relative to the first bevel gear 2252. At this time, the first bevel gear 2252 cannot rotate. Furthermore, when the second bevel gear 2253 rotates along with the stirring rod 221, the second bevel gear 2253 drives the rotating rod 222 to rotate in the stirring rod 221. At this time, the rotating rod 222 drives the flip blade 223 to rotate on the stirring rod 221. At this time, the flip blade 223 drives the soil to flip and transport. Furthermore, when the soil is turned over for transportation, the transportation speed depends on the rotation of the turning blades 223 , thereby ensuring a uniform transportation speed and preventing the soil from piling up at the transportation unit 5 and affecting the quantitative transportation of the soil to the conveyor 7 .

[0036] Example 2: According to the attached Figure 1-7 Shown, including: Support frame 1; A stirring unit 2 is installed in the support frame 1. The stirring unit 2 is connected to a plurality of stirring mechanisms 22. The stirring mechanisms 22 are provided with a plurality of groups of flip blades 223. The flip blades 223 stir the soil. The crushing unit 3 is mounted on the support frame 1. The support frame 1 is directly above the mixing unit 2. The crushing unit 3 is used to crush the soil; The conveying unit 5 is installed in the support frame 1 and is installed below the stirring unit 2. The conveying unit 5 is provided with a connecting seat 53 and a feeding trough 55. The connecting seat 53 is used to transport soil, and the feeding trough 55 is used to spray the agent. The conveyor 7 is provided on one side of the support frame 1 , and the conveying unit 5 is located above the conveyor 7 . The conveyor 7 is used to transport soil.

[0037] The conveying unit 5 includes: A conveying frame 51 is mounted on the support frame 1 and is disposed on the outer peripheral wall of the stirring unit 2; A mounting plate 52 is provided on the outer peripheral wall of the conveying frame 51 and is fixedly mounted on the mounting seat 6; The connecting seat 53 is provided in the conveying frame 51. The connecting seat 53 is located at the discharge port of the mixing drum 21. The feeding seat 54 is rotatably connected to the conveying frame 51. The output end of the conveying frame 51 is connected to the driving motor. A plurality of material conveying troughs 55 are provided in the material conveying seat 54 , and the material conveying troughs 55 are located above the conveyor 7 .

[0038] It is particularly disclosed that the soil in the mixing drum 21 falls into the feed trough 55 by gravity. When the driving motor drives the feed seat 54 to rotate, the feed trough 55 rotates accordingly. When the feed trough 55 rotates to the conveyor 7, the soil falls onto the conveyor 7 by gravity, and the soil is transported in a quantitative manner under the action of the feed trough 55.

[0039] The bottom of the connecting seat 53 is provided with an inclined surface, which is used to scrape the soil flat. The spraying pipe 56 is installed on the conveying frame 51. The spraying pipe 56 is connected to a liquid inlet. The spraying pipe 56 is connected to the repair liquid through the liquid inlet and the liquid inlet pipe.

[0040] Furthermore, when the connecting seat 53 flattens the soil so that the soil thickness is the same, the spraying pipe 56 is used for spraying and mixing, so that the ratio of soil and spray liquid is within an appropriate range, thereby improving the treatment effect on the soil, effectively avoiding the waste of medicine, and reducing the residue of unconsumed medicine in the soil.

[0041] S1: The soil to be remediated is poured into the crushing unit 3. Under the action of the crushing shaft 33 in the crushing unit 3, the clay blocks in the soil are broken. At the same time, under the action of the filter screen in the crushing frame 31, the stones and debris are filtered out to ensure that the agent is in full contact with the contaminated soil. At the same time, the agent is added to the stirring unit 2 in proportion. The agent can be a curing agent, a stabilizer or a microbial preparation. The agent can be added according to the specific contamination of the soil. S2: At this time, the soil enters the stirring unit 2 through the crushing unit 3, and the stirring motor 4 is started to drive the stirring unit 2 to perform mechanical stirring, so that the remediation agent and the soil are evenly mixed, ensuring direct contact between the agent and the pollutants. The remediation agent includes a curing agent, which forms a stable network structure after stirring, encapsulating heavy metals and reducing their mobility. The stirring process optimizes the soil aggregate structure, increases porosity, and enhances water and fertilizer retention capacity, creating favorable conditions for subsequent spraying; S3: Under the stirring of the stirring mechanism 22, the soil in the mixing drum 21 is stirred evenly. At the same time, the flip blade 223 rotates on the stirring rod 221 to turn the soil and push the soil to the discharge port. Under the action of the conveying unit 5 and the rotation of the conveying seat 54, the soil is quantitatively conveyed to the conveyor 7 for transmission; S4: At this time, the spraying pipe 56 sprays chemicals, such as oxidants, surfactants or microbial solutions, which can perform secondary degradation on pollutants that have not been thoroughly treated on the surface. Spraying chemicals containing microorganisms can form an active barrier on the surface, continuously decompose residual pollutants and inhibit the reproduction of pathogens. The soil aggregate structure formed by stirring improves permeability, making it easier for the subsequent spraying of the washing liquid to penetrate into the lower layer and dissolve the residual pollutants. The spraying adjuvant can reduce the adhesion between the pollutants and the soil particles, and assist in the further desorption of the residual pollutants after stirring.

[0042] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A coupled in-situ remediation device for heavy metal contaminated soil, characterized in that: include: Support frame (1); A stirring unit (2) is installed in the support frame (1), wherein the stirring unit (2) is connected to a plurality of stirring mechanisms (22) in a transmission manner, and the stirring mechanisms (22) are provided with a plurality of groups of flip blades (223), and the flip blades (223) stir the soil; A crushing unit (3) is mounted on a support frame (1), wherein the support frame (1) is located directly above the stirring unit (2), and the crushing unit (3) is used to crush the soil; A conveying unit (5) is installed in the support frame (1), the conveying unit (5) is installed below the stirring unit (2), and a conveying seat (54) and a spraying pipe (56) are provided in the conveying unit (5), the conveying seat (54) is used to convey soil, and the spraying pipe (56) is used to spray the agent; The conveyor (7) is arranged on one side of the support frame (1), the conveying unit (5) is located above the conveyor (7), and the conveyor (7) is used to convey soil.

2. The coupled in-situ remediation device for heavy metal contaminated soil according to claim 1, characterized in that: The crushing unit (3) comprises: A crushing frame (31) is provided with a discharge port below the crushing frame, the discharge port being connected to the interior of the stirring unit (2); A mounting bracket (32) fixedly connected to the outer peripheral wall of the crushing frame (31), wherein the mounting bracket (32) is mounted on the support frame (1); A plurality of crushing shafts (33) are rotatably connected to the crushing frame (31), and a synchronous belt is connected between the plurality of crushing shafts (33), and the synchronous belt is used to drive the plurality of crushing shafts (33) to rotate simultaneously; A pulverizing motor (34) is mounted on one side of the pulverizing frame (31), and an output end of the pulverizing motor (34) is connected to one end of the pulverizing shaft (33).

3. The coupled in-situ remediation device for heavy metal contaminated soil according to claim 1, characterized in that: A mounting frame (11) is provided on one side of the support frame (1), a stirring motor (4) is installed on the mounting frame (11), an output end of the stirring motor (4) is connected to one of the stirring mechanisms (22), the stirring unit (2) comprises a stirring drum (21) and a protective frame (23), the stirring mechanism (22) is rotatably connected in the stirring drum (21), a discharge port is provided below the stirring drum (21), a synchronous pulley is provided for transmission connection between the plurality of stirring mechanisms (22), the protective frame (23) is installed on the outer wall of the stirring drum (21), and the protective frame (23) is sleeved on the outer peripheral wall of the stirring mechanism (22).

4. The coupled in-situ remediation device for heavy metal contaminated soil according to claim 3, characterized in that: The stirring mechanism (22) comprises: A stirring rod (221) rotatably connected to the stirring drum (21); A plurality of rotating rods (222) are rotatably connected to the stirring rod (221); a transmission assembly (224) is provided between the plurality of rotating rods (222); the transmission assembly (224) is used to drive the plurality of rotating rods (222) to rotate simultaneously; A plurality of flip blades (223) sleeved on the outer peripheral wall of the rotating rod (222); A rotating assembly (225) is located in the stirring rod (221), and the rotating assembly (225) is in transmission connection with the corresponding rotating rod (222). The rotating assembly (225) is used to drive the corresponding rotating rod (222) to rotate.

5. The coupled in-situ remediation device for heavy metal contaminated soil according to claim 4, characterized in that: The transmission assembly (224) comprises a first transmission wheel (2241) and a second transmission wheel (2242); the first transmission wheel (2241) and the second transmission wheel (2242) are sleeved on the outer peripheral wall of the rotating rod (222); the first transmission wheel (2241) and the second transmission wheel (2242) are fixedly connected; a transmission belt (2243) is provided on the second transmission wheel (2242) and the first transmission wheel (2241); a protective frame (226) is installed on the outer peripheral wall of the stirring rod (221); the protective frame (226) is sleeved on the outer peripheral wall of the transmission assembly (224).

6. The coupled in-situ remediation device for heavy metal contaminated soil according to claim 5, characterized in that: The rotating assembly (225) includes: A connecting rod (2251) is rotatably connected to the stirring rod (221); a connecting plate (61) is provided at one end of the stirring rod (221); the connecting plate (61) is mounted on the connecting rod (2251); a mounting seat (6) is mounted at one end of the connecting plate (61); and the mounting seat (6) is mounted on the outer wall of the stirring drum (21); A first bevel gear (2252) is sleeved on the outer peripheral wall of the connecting rod (2251); A plurality of second bevel gears (2253) are sleeved on the outer peripheral walls of the corresponding rotating rods (222), and the second bevel gears (2253) are meshed with the first bevel gears (2252).

7. The coupled in-situ remediation device for heavy metal contaminated soil according to claim 1, characterized in that: The conveying unit (5) comprises: A conveying frame (51) is mounted on the support frame (1), and the conveying frame (51) is arranged on the outer peripheral wall of the stirring unit (2); A mounting plate (52) is provided on the outer peripheral wall of the conveying frame (51), wherein the mounting plate (52) is fixedly mounted on the mounting seat (6); A connecting seat (53) is provided in the conveying frame (51), the connecting seat (53) is located at the discharge port of the mixing drum (21), the feeding seat (54) is rotatably connected to the conveying frame (51), and the output end of the conveying frame (51) is connected to a driving motor; A plurality of material conveying troughs (55) are provided in the material conveying seat (54), and the material conveying troughs (55) are located above the conveyor (7).

8. The coupled in-situ remediation device for heavy metal contaminated soil according to claim 7, characterized in that: The lower portion of the connecting seat (53) is provided with an inclined surface for leveling the soil. The spraying pipe (56) is mounted on the conveying frame (51). The spraying pipe (56) is connected to a liquid inlet. The spraying pipe (56) is connected to the repair liquid through the liquid inlet and the liquid inlet pipe.

9. A coupled in-situ remediation process for heavy metal contaminated soil, a coupled in-situ remediation device for heavy metal contaminated soil according to claims 1-8, characterized in that: The following steps are involved: S1: The soil to be remediated is poured into the crushing unit (3). Under the action of the crushing shaft (33) in the crushing unit (3), the clay blocks in the soil are crushed. At the same time, under the action of the filter screen in the crushing frame (31), the stones and debris are filtered out to ensure that the agent is in full contact with the contaminated soil. At the same time, the agent is added to the mixing unit (2) in proportion. S2: At this time, the soil enters the stirring unit (2) through the crushing unit (3), and the stirring motor (4) is started to drive the stirring unit (2) to perform mechanical stirring, so that the remediation agent and the soil are evenly mixed, ensuring direct contact between the agent and the pollutant. The remediation agent includes a curing agent, which forms a stable network structure after stirring, encapsulating heavy metals and reducing their mobility. The stirring process optimizes the soil aggregate structure, increases porosity, enhances water and fertilizer retention capacity, and creates favorable conditions for subsequent spraying; S3: Under the stirring of the stirring mechanism (22), the soil in the stirring drum (21) is stirred evenly, and at the same time, the turning blade (223) rotates on the stirring rod (221), turning the soil, and pushing the soil to the discharge port. Under the action of the conveying unit (5), the soil is quantitatively conveyed under the rotation of the conveying seat (54), so that the soil is conveyed to the conveyor (7) for transmission; S4: At this time, the spraying pipe (56) sprays the agent, which can be used to perform secondary degradation on the pollutants that have not been thoroughly treated on the surface. The spraying of the agent containing microorganisms can form an active barrier on the surface, continuously decompose the residual pollutants and inhibit the reproduction of pathogens. The spraying adjuvant can reduce the adhesion between the pollutants and the soil particles, and assist in the further desorption of the residual pollutants after stirring.

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