A system and method for treating organic contaminated soil

Abstract

The application discloses a kind of organic matter contaminated soil processing system and method, belong to contaminated soil processing field, a kind of organic matter contaminated soil processing system, including crusher, heating furnace, incinerator and alkaline washing tower, heating furnace includes furnace body, the right side wall inside furnace body is fixed with microwave heating assembly, the inner side wall of left and right two partitions is fixed with rotating table, net bucket is fixed to the rotating end of rotating table, the middle part of the outer side wall of net bucket is fixed with gear ring, the lower left side wall in furnace body is fixed with motor, the right end of motor is fixed with shaft, the right end of shaft is fixed with gear, the stirring end of stirring piece is located in net bucket, shaft is driven connection with stirring piece by transmission part, steam heating assembly has two steam discharge ends, one of steam discharge ends is located below net bucket, another steam discharge end extends to the inside of stirring piece.The application is heated in different forms to remove different boiling point organic solvents from organic contaminated soil.

Description

Technical Field

[0001] This invention belongs to the field of contaminated soil treatment, and particularly relates to a system and method for treating organic contaminated soil. Background Technology

[0002] Petrochemical, pharmaceutical and other industries involving chlorobenzene, toluene, C 10 + In industries using organic solvents such as aliphatic hydrocarbons, raw materials and products can flow into water bodies and soil during production. When factories are relocated or production ceases, and the original sites are reclaimed or developed, soil contamination from components such as chlorobenzene necessitates soil remediation to reduce pollutant levels to within limits. Therefore, there is an urgent need for a method capable of removing chlorobenzene, toluene, and C... 10 + Treatment systems and methods for organic pollutants in soil, such as aliphatic hydrocarbons, to reduce organic solvents to within limits. Summary of the Invention

[0003] The purpose of this invention is to provide a system and method for treating soil contaminated with organic matter, so as to overcome at least one of the above-mentioned defects in the prior art.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] This invention provides a treatment system for organically contaminated soil, comprising a crusher, a heating furnace, an incinerator, and an alkaline washing tower arranged sequentially along the treatment direction. The heating furnace includes a furnace body, partitions, a microwave heating assembly, a rotating table, a mesh drum, a gear ring, gears, a rotating shaft, a motor, a transmission component, a stirring component, a steam heating assembly, and an exhaust pipe. Partitions are fixed to both the left and right sides of the furnace body. A microwave heating assembly is fixed to the right side wall of the furnace body. The partition on the right side has several first radiation holes, and the microwave heating assembly has several second radiation holes communicating with the first radiation holes. A rotating table is fixed to the inner side wall of both the left and right partitions, and the mesh drum is fixed to the rotating end of the rotating table. A gear ring is fixed to the middle of the outer wall of the barrel. A motor is fixed to the lower left side wall inside the furnace body. A rotating shaft is fixed to the right end of the motor. The right end of the rotating shaft passes through the partition on the left side and is fixed with a gear. The gear meshes with the gear ring. The rotating shaft is sealed to the partition on the left side. The stirring end of the agitator is located inside the mesh barrel. The rotating shaft is connected to the agitator through a transmission component. The steam heating component has two steam discharge ends. One steam discharge end is located below the mesh barrel, and the other steam discharge end extends into the interior of the agitator. The agitator has several vents to discharge the steam delivered by the steam heating component. An exhaust pipe is fixedly connected to the center of the top wall of the furnace body. The exhaust pipe is connected to the incinerator.

[0006] Preferably, the agitator includes a hollow shaft, a bearing housing, and agitator blades. The bearing housing is fixed to the left side wall of the partition on the left side. The hollow shaft passes through the bearing housing, the partition on the left side, and the left side wall of the mesh barrel, and extends into the interior of the mesh barrel where several agitator blades are fixed. Several air holes are opened on the side wall of the hollow shaft.

[0007] Preferably, a mesh plate is provided inside both the air pores and the first radial hole.

[0008] Preferably, there are two sets of stirring blades, located on the left and right sides of the mesh barrel respectively. The hollow shaft between the two sets of stirring blades is fixed with a first spiral blade and a second spiral blade. The spiral directions of the first spiral blade and the second spiral blade are opposite, and the motor is a forward and reverse rotating motor.

[0009] Preferably, the steam heating assembly includes a steam delivery main pipe, a first branch pipe, a second branch pipe, a distribution pipe, and a third branch pipe. The steam delivery main pipe is connected to an external steam source. The right end of the steam delivery main pipe is fixed with the first branch pipe and the second branch pipe. The right end of the first branch pipe extends into the hollow shaft. The outer wall of the first branch pipe is sealed to the inner wall of the hollow shaft. The right end of the second branch pipe passes through a partition located on the left side and is fixedly connected to the distribution pipe. The right side of the distribution pipe is fixedly connected to several third branch pipes. Several steam discharge holes are opened at the top of the third branch pipes. The several third branch pipes are equidistantly distributed along the length direction of the distribution pipe. The several steam discharge holes are equidistantly distributed along the length direction of the third branch pipes. The steam delivery main pipe, the first branch pipe, and the second branch pipe are all equipped with solenoid valves.

[0010] Preferably, the transmission component includes a drive wheel, a transmission wheel, and a transmission belt. The drive wheel is fixed to the rotating shaft, the transmission wheel is fixed with a hollow shaft, and the drive wheel and the transmission wheel are connected by a transmission belt.

[0011] Preferably, the microwave heating assembly includes a microwave generator and a waveguide. The waveguide is provided on the left side of the microwave generator. A plurality of second radiation holes are provided on the left side wall of the waveguide. The plurality of first radiation holes include a first hole and a plurality of second holes that are equidistantly distributed around the first hole. The first hole is located at the center of the partition.

[0012] Preferably, the rotary table includes an annular slide rail and two sliders slidably connected to the annular slide rail. The sliders are connected to the mesh barrel. The annular slide rail on the right side has a through hole in the middle, and the first hole communicates with the through hole.

[0013] Preferably, the front side wall of the heating furnace is sealed with a furnace door, and the side wall of the mesh drum is provided with a drum door.

[0014] This invention also provides a method for treating organically contaminated soil, using the aforementioned organically contaminated soil treatment system, comprising the following steps: The organically contaminated soil is sorted to remove impurities, then fed into a crusher to be pulverized to <1mm, and then fed into a heating furnace. Saturated steam at 150℃-180℃ is introduced first, and the soil is heated for 0.5-1 hour to release low-boiling-point pollutants from the surface of the organically contaminated soil. Volatile organic compounds are sent to an incinerator. After steam heating is complete, the steam supply is stopped, and microwave heating is started, raising the temperature to 300℃-350℃ and maintaining it for 20-30 minutes, then raising the temperature to 600℃-650℃ and maintaining it for 20-30 minutes to remove high-boiling-point pollutants, resulting in purified soil. The generated waste gas is sent to an incinerator, where the heating temperature is 820℃-850℃. The organic matter reacts with oxygen to produce carbon dioxide and water. The exhaust gas from the incinerator enters an alkaline scrubbing tower for absorption and treatment of acidic gases, and then purified gas is discharged.

[0015] The beneficial effects of this invention are as follows:

[0016] 1. Using a crusher increases the surface area of ​​organically contaminated soil, which is beneficial for subsequent heating. Based on this, a steam + microwave heating process is used to remove chlorobenzene, toluene, and C from the organically contaminated soil. 10 + Organic solvents such as aliphatic hydrocarbons are reduced to within limits. Different boiling points of these solvents are removed from the organically contaminated soil through heating in various forms, resulting in purified soil. Furthermore, the generated waste gas is incinerated to oxidize organic matter into carbon dioxide and water. Residual acidic gases are then absorbed and treated in an alkaline scrubbing tower, yielding purified gas for discharge. This process not only purifies the organically contaminated soil but also generates no waste gas, achieving soil remediation without causing additional air pollution.

[0017] 2. The mixing element stirs the organic polluted soil inside the mesh bucket, ensuring that the organic polluted soil is heated evenly and improving heating efficiency.

[0018] 3. During steam heating, steam is heated from both the bottom and the inside of the mesh drum by the steam heating components, achieving dual heating of the organic contaminated soil pile from the outside to the inside and from the inside to the outside, making the heating more comprehensive and thorough.

[0019] 4. During microwave heating, the organic contaminated soil inside the mesh bucket is heated by microwave through the microwave heating component. Under the premise of steam heating, microwave heating is carried out. The high-frequency reciprocating motion of the dipole molecules inside the organic contaminated soil generates "internal friction heat" to raise the temperature of the organic contaminated soil. Without any heat conduction process, the inside and outside of the organic contaminated soil can be heated and heated at the same time. The heating speed is fast and uniform.

[0020] 5. The combination of microwave heating and stirring not only agitates the organically contaminated soil, ensuring uniform heating and reducing local overheating or undercooling, but also disperses the microwaves, making the microwave heating more uniform.

[0021] 6. By setting the first and second spiral blades with opposite spiral directions, the organic polluted soil is stirred and pushed outward or inward, making the organic polluted soil more evenly heated.

[0022] 7. Simply adjusting the forward and reverse rotation of the motor is enough to push the organic polluted soil outward or inward for replacement, while also changing the rotation direction of the mesh bucket and the mixing components, so that the organic polluted soil is heated more evenly.

[0023] 8. The distribution of the third branch pipe and steam exhaust hole makes steam heating more uniform.

[0024] 9. By setting the solenoid valve, the steam flow rate and the opening and closing of the first and second branch pipes can be adjusted according to the needs, so as to realize steam heating at the bottom of the mesh barrel, steam heating inside the mesh barrel, or simultaneous steam heating.

[0025] 10. The distribution of the first and second holes makes the microwave dispersion more uniform. Attached Figure Description

[0026] Figure 1 This is a system block diagram of the present invention.

[0027] Figure 2 This is a schematic diagram of the main structure of the heating furnace of the present invention.

[0028] Figure 3 This is a cross-sectional structural schematic diagram of the heating furnace of the present invention.

[0029] Figure 4 This is a partial front view structural schematic diagram of the stirring component of the present invention.

[0030] Figure 5 This is a partial top view of the steam heating assembly of the present invention.

[0031] Figure 6 This is a right-side structural schematic diagram of the first radiation hole, partition, annular slide rail, and mesh plate of the present invention.

[0032] The labels in the attached diagram are as follows: 100-crusher, 200-heating furnace, 300-incinerator, 400-alkali washing tower, 1-furnace body, 2-baffle plate, 3-microwave heating assembly, 4-rotating table, 5-transmission component, 6-steam heating assembly, 7-stirring component, 8-shaft, 9-motor, 10-mesh tank, 11-gear, 12-gear ring, 13-exhaust pipe, 14-first radial hole, 141-first hole, 142-second hole, 71-hollow shaft, 72-bearing seat, 73-stirring blade. 74-Air hole, 15-Mesh plate, 16-First spiral blade, 17-Second spiral blade, 61-Steam main pipe, 62-First branch pipe, 63-Second branch pipe, 64-Distribution pipe, 65-Third branch pipe, 66-Steam discharge hole, 67-Solenoid valve, 51-Drive wheel, 52-Transmission wheel, 53-Transmission belt, 31-Microwave generator, 32-Waveguide, 33-Second radiation hole, 41-Annular slide rail, 42-Slider, 43-Through hole, 18-Furnace door, 19-Barrel door. Detailed Implementation

[0033] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0034] Contents not described in detail in this specification are prior art known to those skilled in the art. In the description of this invention, it should be understood that terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0035] like Figures 1 to 6 As shown, the soil treatment system for organic pollutants provided in this embodiment includes a crusher 100, a heating furnace 200, an incinerator 300, and an alkaline washing tower 400 arranged sequentially along the treatment direction.

[0036] This embodiment also provides a method for treating organic polluted soil, which uses the above-mentioned organic polluted soil treatment system and includes the following steps;

[0037] The organically contaminated soil is sorted to remove debris such as branches and plastics, and then fed into a crusher 100 to be pulverized to <1mm. In this embodiment, the crusher 100 is a double-toothed roller crusher 100. Organically contaminated soil larger than 1mm is returned to the crusher 100 for further pulverization. The crusher 100 has a protective cover to collect dust and gas during the crushing process. The crusher 100 pulverizes the organically contaminated soil into small particles, increasing the surface area. Then, it is fed into a heating furnace 200, where saturated steam at 160℃ is introduced and heated for 0.7 hours to release low-boiling-point pollutants such as chlorobenzene, toluene, and octane from the surface of the organically contaminated soil. Volatile organic compounds are sent to an incinerator 300. After steam heating is complete, the steam supply is stopped. Microwave heating is then initiated, with phased heating: the temperature is raised to 320℃ and held for 25 minutes, then raised to 620℃ and held for 30 minutes to remove carbon dioxide. 10 + High-boiling-point pollutants such as aliphatic hydrocarbons are purified in the soil. The generated waste gas is sent to incinerator 300, which is heated to 850℃. Organic matter reacts with oxygen to produce carbon dioxide and water. The gas from incinerator 300 enters alkaline scrubbing tower 400 to absorb and treat acidic gases such as hydrogen chloride, and then the purified gas is discharged.

[0038] Therefore, using a crusher to increase the surface area of ​​the organically contaminated soil (100mm) is beneficial for subsequent heating. Based on this, a steam + microwave heating process is used to remove chlorobenzene, toluene, and C from the organically contaminated soil. 10 + Organic solvents such as aliphatic hydrocarbons are reduced to within limits. Different boiling points of these solvents are removed from the organically contaminated soil through heating in various forms, resulting in purified soil. The generated waste gas is then incinerated in an incinerator (300) to oxidize the organic matter into carbon dioxide and water. Residual acidic gases are absorbed and treated in an alkaline scrubbing tower (400), resulting in purified gas before discharge. This process not only purifies the organically contaminated soil but also generates no waste gas, achieving soil remediation without causing additional air pollution.

[0039] The heating furnace 200 includes a furnace body 1, partitions 2, a microwave heating component 3, a rotating table 4, a mesh barrel 10, a gear ring 12, a gear 11, a rotating shaft 8, a motor 9, a transmission component 5, a stirring component 7, a steam heating component 6, and an exhaust pipe 13. Partitions 2 are fixed to both the left and right sides inside the furnace body 1. The microwave heating component 3 is fixed to the right side wall inside the furnace body 1. The right partition 2 has several first radiation holes 14, and the microwave heating component 3 has several second radiation holes 33 communicating with the first radiation holes 14. A rotating table 4 is fixed to the inner side wall of both the left and right partitions 2. The mesh barrel 10 is fixed to the rotating end of the rotating table 4. A gear ring 12 is fixed to the middle of the outer side wall of the mesh barrel 10. A motor 9 is fixed to the lower part of the left side wall inside the furnace body 1. The right end of the motor 9 is fixed... There is a rotating shaft 8, the right end of which passes through the partition 2 located on the left and is fixed with a gear 11. The gear 11 meshes with the gear ring 12. The rotating shaft 8 and the partition 2 located on the left are sealed together. The stirring end of the stirring component 7 is located inside the mesh barrel 10. The rotating shaft 8 is connected to the stirring component 7 through the transmission component 5. The steam heating component 6 has two steam discharge ends. One steam discharge end is located below the mesh barrel 10, and the other steam discharge end extends into the interior of the stirring component 7. The stirring component 7 has several vent holes 74 for discharging the steam delivered by the steam heating component 6. The center of the top wall of the furnace body 1 is fixedly connected to an exhaust pipe 13, which is connected to the incinerator 300. The front side wall of the heating furnace 200 is sealed with a furnace door 18, and the side wall of the mesh barrel 10 is provided with a barrel door 19.

[0040] Motor 9 drives shaft 8 to rotate, causing gear 11 to rotate, which in turn drives gear ring 12 to rotate in the opposite direction, thus causing mesh drum 10 to rotate in the opposite direction. The rotating platform 4 ensures stable rotation of mesh drum 10. Driven by transmission belt 53, agitator 7 rotates, stirring the organic contaminated soil inside mesh drum 10, ensuring even heating and improving heating efficiency. Furthermore, the rotation direction of agitator 7 is opposite to that of mesh drum 10, further enhancing the stirring effect on the organic contaminated soil. During steam heating, steam is supplied by steam heating component 6 from both below and inside mesh drum 10, achieving dual heating of the organic contaminated soil pile from the outside in and from the inside out, resulting in more comprehensive and thorough heating. Only one motor 9 is needed to achieve the counter-rotation of mesh drum 10 and agitator 7, reducing costs. During microwave heating, the organic contaminated soil inside the mesh bucket 10 is heated by microwave heating component 3. Under the premise of steam heating, microwave heating is carried out. The high-frequency reciprocating motion of dipole molecules inside the organic contaminated soil generates "internal friction heat", which raises the temperature of the organic contaminated soil. Without any heat conduction process, the inside and outside of the organic contaminated soil can be heated and heated at the same time. The heating speed is fast and uniform. Combined with the setting of stirring component 7, it can not only stir the organic contaminated soil to ensure uniform heating of the organic contaminated soil and reduce the problem of local overheating or overcooling, but also disperse the microwaves, making microwave heating more uniform.

[0041] The agitator 7 includes a hollow shaft 71, a bearing seat 72, and agitator blades 73. The bearing seat 72 is fixed to the left side wall of the partition 2 on the left side. The hollow shaft 71 passes through the bearing seat 72, the partition 2 on the left side, and the left side wall of the mesh bucket 10, and extends into the interior of the mesh bucket 10 where several agitator blades 73 are fixed. Several air holes 74 are formed on the side wall of the hollow shaft 71, and the hollow shaft 71 is sealed to the partition 2 on the left side. When the shaft 8 rotates, it drives the hollow shaft 71 to rotate through the transmission component 5, causing the agitator blades 73 to rotate and agitate the organically contaminated soil. Through the air holes 74 on the side wall of the hollow shaft 71, a portion of saturated steam is discharged through the air holes 74, heating the organically contaminated soil pile from the inside out.

[0042] Both the vents 74 and the first radial holes 14 are equipped with mesh panels 15. The mesh panels 15 prevent organically contaminated soil from passing through the vents 74 and the first radial holes 14.

[0043] The system comprises two sets of stirring blades 73, located on the left and right sides of the mesh tank 10, respectively. A first spiral blade 16 and a second spiral blade 17 are fixed to the hollow shaft 71 between the two sets of stirring blades 73. The first spiral blade 16 is located to the left of the second spiral blade 17, and the spiral directions of the first spiral blade 16 and the second spiral blade 17 are opposite. The motor 9 is a reversible motor. By using the first spiral blade 16 and the second spiral blade 17 with opposite spiral directions, the organically contaminated soil is stirred while being pushed outwards or inwards, resulting in more uniform heating of the organically contaminated soil. Furthermore, simply adjusting the forward or reverse rotation of the motor 9 allows for the replacement of pushing the organically contaminated soil outwards or inwards, simultaneously changing the rotation direction of the mesh tank 10 and the stirring element 7, thus ensuring more uniform heating of the organically contaminated soil.

[0044] The steam heating assembly 6 includes a steam delivery main pipe 61, a first branch pipe 62, a second branch pipe 63, a distribution pipe 64, and a third branch pipe 65. The steam delivery main pipe 61 is connected to an external steam source. The right end of the steam delivery main pipe 61 is fixed with the first branch pipe 62 and the second branch pipe 63. The right end of the first branch pipe 62 extends into the hollow shaft 71. The outer wall of the first branch pipe 62 is sealed to the inner wall of the hollow shaft 71. The right end of the second branch pipe 63 passes through the partition 2 located on the left side and is fixedly connected to the distribution pipe 64. The right side of the distribution pipe 64 is fixedly connected to several third branch pipes 65. Several steam discharge holes 66 are opened at the top of the third branch pipes 65. Several third branch pipes 65 are equidistantly distributed along the length direction of the distribution pipe 64. Several steam discharge holes 66 are equidistantly distributed along the length direction of the third branch pipes 65. The steam delivery main pipe 61, the first branch pipe 62, and the second branch pipe 63 are all equipped with solenoid valves 67. Steam is delivered through the main steam pipe 61 to the first branch pipe 62 and the second branch pipe 63. The first branch pipe 62 delivers steam into the hollow shaft 71, and the second branch pipe 63 delivers steam into the distribution pipe 64, which distributes the steam into each of the third branch pipes 65, and finally discharges it upwards through the discharge hole. The distribution of the third branch pipes 65 and the steam discharge hole 66 makes the steam heating more uniform. The solenoid valve 67 can be used to adjust the steam flow rate and the opening and closing of the first branch pipe 62 and the second branch pipe 63 as needed, so as to achieve steam heating at the bottom of the mesh barrel 10, steam heating inside the mesh barrel 10, or simultaneous steam heating.

[0045] The transmission component 5 includes a drive wheel 51, a transmission wheel 52, and a transmission belt 53. The drive wheel 51 is fixed to the rotating shaft 8, and the transmission wheel 52 is fixed to a hollow shaft 71. The drive wheel 51 and the transmission wheel 52 are connected by the transmission belt 53. When the rotating shaft 8 rotates, it drives the drive wheel 51 to rotate, which in turn drives the transmission wheel 52 to rotate via the transmission belt 53, causing the hollow shaft 71 to rotate.

[0046] The microwave heating assembly 3 includes a microwave generator 31 and a waveguide 32. The waveguide 32 is located on the left side of the microwave generator 31. The left side wall of the waveguide 32 has several second radiation holes 33. The several first radiation holes 14 include a first hole 141 and several second holes 142 that are equidistantly distributed around the first hole 141. The first hole 141 is located at the center of the partition 2. The distribution of the first hole 141 and the second hole 142 makes the microwave dispersion more uniform.

[0047] The rotating stage 4 includes an annular slide rail 41 and two sliders 42 slidably connected to the annular slide rail 41. The sliders 42 are connected to the mesh barrel 10. The annular slide rail 41 on the right side has a through hole 43 in the middle, and a first hole 141 communicates with the through hole 43. The through hole 43 does not obstruct the microwave transmission through the first hole 141, ensuring uniform microwave dispersion.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A system for treating soil contaminated with organic matter, characterized in that: It includes a crusher, a heating furnace, an incinerator, and an alkali washing tower arranged sequentially along the processing direction; The heating furnace includes a furnace body, partitions, microwave heating components, a rotating table, a mesh drum, a gear ring, gears, a rotating shaft, a motor, transmission components, a stirring component, a steam heating component, and an exhaust pipe; The furnace body is fixed with partitions on both the left and right sides. A microwave heating component is fixed on the right side wall of the furnace body. The partition on the right side has a plurality of first radiation holes. The microwave heating component has a plurality of second radiation holes that communicate with the first radiation holes. A rotating platform is fixed to the inner sidewall of both the left and right partitions. The mesh barrel is fixed to the rotating end of the rotating platform, and a toothed ring is fixed to the middle of the outer sidewall of the mesh barrel. A motor is fixed to the lower left side wall inside the furnace body. A rotating shaft is fixed to the right end of the motor. The right end of the rotating shaft passes through the partition on the left side and is fixed with a gear. The gear meshes with the gear ring. The rotating shaft is sealed to the partition on the left side. The stirring end of the stirring element is located inside the mesh barrel, and the rotating shaft is connected to the stirring element through a transmission component. The steam heating assembly has two steam discharge ends, one of which is located below the mesh barrel and the other extends into the interior of the stirring element, which has several vents for discharging the steam supplied by the steam heating assembly. An exhaust pipe is fixedly connected to the center of the top wall of the furnace body, and the exhaust pipe is connected to the incinerator; The stirring component includes a hollow shaft, a bearing housing, and stirring blades; A bearing seat is fixed to the left side wall of the partition located on the left side. The hollow shaft passes through the bearing seat, the partition located on the left side, and the left side wall of the mesh barrel, and extends into the interior of the mesh barrel where several stirring blades are fixed. Several of the aforementioned pores are formed on the sidewall of the hollow shaft; The stirring blades are arranged in two groups, located on the left and right sides of the mesh barrel, respectively. The hollow shaft between the two sets of stirring blades is fixed with a first helical blade and a second helical blade; The first and second helical blades have opposite helical directions; The motor is a reversible motor.

2. The soil treatment system for organic contaminated materials according to claim 1, characterized in that: Both the air pores and the first radial pores are equipped with mesh plates.

3. The soil treatment system for organic contaminated soil according to claim 1, characterized in that: The steam heating assembly includes a main steam delivery pipe, a first branch pipe, a second branch pipe, a distribution pipe, and a third branch pipe; The main steam supply pipe is connected to an external steam source. The right end of the main steam supply pipe is fixed with a first branch pipe and a second branch pipe. The right end of the first branch pipe extends into the hollow shaft. The outer wall of the first branch pipe is sealed with the inner wall of the hollow shaft. The right end of the second branch pipe passes through a partition located on the left side and is fixedly connected to a distribution pipe. The right side of the distribution pipe is fixedly connected to several third branch pipes. Several steam discharge holes are opened at the top of the third branch pipe. Several of the third branch pipes are distributed at equal intervals along the length direction of the distribution pipe; Several of the steam discharge holes are distributed at equal intervals along the length of the third branch pipe; The main steam transmission pipe, the first branch pipe, and the second branch pipe are all equipped with solenoid valves.

4. The soil treatment system for organic contaminated materials according to claim 1, characterized in that: The transmission components include a drive wheel, a transmission wheel, and a transmission belt; The drive wheel is fixed to the rotating shaft, the transmission wheel is fixed to the hollow shaft, and the drive wheel and the transmission wheel are connected by a transmission belt.

5. The soil treatment system for organic contaminated soil according to claim 1, characterized in that: The microwave heating assembly includes a microwave generator and a waveguide. A waveguide is provided on the left side of the microwave generator, and a number of second radiation holes are opened on the left side wall of the waveguide. The plurality of first radial holes include a first hole and a plurality of second holes circumferentially spaced around the first hole, wherein the first hole is located at the center of the partition.

6. The soil treatment system for organic contaminated matter according to claim 5, characterized in that: The rotating table includes an annular slide rail and two sliders slidably connected to the annular slide rail, the sliders being connected to the mesh barrel; The annular slide rail located on the right side has a through hole in the middle, and the first hole communicates with the through hole.

7. The soil treatment system for organic contaminated materials according to claim 1, characterized in that: The front sidewall of the heating furnace is sealed with a furnace door; The side wall of the net bucket is provided with a bucket door.

8. A method for treating soil contaminated with organic matter, characterized in that, The treatment of organically contaminated soil using the treatment system according to any one of claims 1-7 includes the following steps; The contaminated organic soil is sorted to remove impurities and then fed into a crusher to be pulverized to <1mm. It is then fed into a heating furnace, where saturated steam at 150℃-180℃ is introduced and heated for 0.5-1 hour. This process causes low-boiling-point pollutants to precipitate from the surface of the soil. Volatile organic compounds are sent to the incinerator. After steam heating is complete, the steam supply is stopped, and microwave heating is initiated. The temperature is raised to 300℃-350℃ and maintained for 20-30 minutes, then raised to 600℃-650℃ and maintained for 20-30 minutes to remove high-boiling-point pollutants, resulting in purified soil. The generated waste gas is sent to the incinerator, where the heating temperature is 820℃-850℃. The organic matter reacts with oxygen to produce carbon dioxide and water. The exhaust gas from the incinerator enters an alkaline scrubbing tower for absorption and treatment of acidic gases, before being discharged as purified gas.

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