Sludge treatment equipment and method for soil treatment

Abstract

The invention discloses sludge treatment equipment and method for soil governing.The equipment comprises a supporting base, a sludge treatment mechanism comprises a mounting ring arranged in a treatment cylinder, a mounting groove is formed in the bottom of a connecting rod, a connecting pipe connected with a flow dividing box is mounted in the mounting groove, and a plurality of spraying holes are formed in the connecting pipe; a filter screen connected with the connecting rod is rotationally arranged in the magnetic ring; the method comprises the following steps: S1, conveying sludge into a treatment cylinder through a sludge pipe, S2, working a water pump, S3, exhausting air below a rotating plate through an air exhaust mechanism to enable the rotating plate to be in a negative pressure state, and S4, enabling the treated sludge to fall into a conical cylinder and finally discharging through a sewage discharge pipe. By means of multiple treatment modes of magnetic attraction, spiral mixing and negative pressure mixing separation, the problems that existing equipment cannot thoroughly remove heavy metal and is poor in purification effect are solved, and treated sludge can meet the follow-up application requirement of soil treatment.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and in particular to a sludge treatment device and method for soil remediation. Background Technology

[0002] With the development of modern society, the amount of wastewater containing heavy metal ions is increasing. Since heavy metal ions are difficult to degrade under natural conditions, they not only pollute water sources and soil, but also enter the human body through bioaccumulation in the food chain, thus harming human health. Therefore, it is particularly important to treat wastewater containing heavy metal ions. Existing equipment for treating heavy metal pollution generally has problems such as poor purification capacity, single purification method, and inability to treat the generated sludge.

[0003] The invention patent CN106219914A discloses a sludge treatment device. It filters particles in the sludge through a filter screen to make the sludge finer. A heating device heats the heating chamber, and water vapor is discharged from the water vapor exhaust port to make the sludge drier. A magnetic device adsorbs magnetic metal particles to avoid excessive heavy metal content in the sludge. The discharge cylinder drives the discharge push plate to discharge the sludge, reducing the need for manual operation, increasing the economic benefits of the enterprise, and reducing the production costs of the enterprise.

[0004] While the existing technology can filter sludge, it cannot effectively remove heavy metals from the sludge inside the treatment tower, resulting in incomplete removal of heavy metal ions and poor purification effect. The treated sludge still cannot meet the requirements of subsequent applications such as soil remediation.

[0005] Therefore, this application proposes a sludge treatment device and method for soil remediation. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned technical problems by providing a sludge treatment device and method for soil remediation.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A sludge treatment device for soil remediation includes a support base, the upper end of which is provided with a treatment cylinder, and a sludge treatment mechanism is provided inside the cylinder. The sludge treatment mechanism includes an installation ring disposed inside the treatment cylinder, a magnetic ring fixed to the inner wall of the installation ring, a rotating ring coaxially disposed at the bottom of the installation ring, a diversion box disposed in the middle of the rotating ring, the diversion box being connected to the rotating ring via multiple connecting rods, an installation groove disposed at the bottom of the connecting rods, a connecting pipe connected to the diversion box being installed in the installation groove, multiple spray holes being installed on the connecting pipe, and a filter screen connected to the connecting rods being rotatably disposed inside the magnetic ring; The processing cylinder has a rotating plate inside, and the rotating plate has multiple conical holes running through its top and bottom. The rotating plate is connected to the diversion box via a vertical rod. It also includes an air extraction mechanism, which is connected to the processing cylinder and located below the rotating plate. The operation of the air extraction mechanism puts the space below the rotating plate of the processing cylinder under negative pressure.

[0008] Preferably, the processing cylinder includes a cylinder body, a conical cylinder is installed at the lower end of the cylinder body, a sewage pipe is installed at the bottom of the conical cylinder, a top cover is installed at the upper end of the cylinder body, a sludge pipe and an air inlet pipe are installed at the upper end of the top cover, and a solenoid valve is installed on the air inlet pipe. The mounting ring is fixed to the inner wall of the cylinder.

[0009] Preferably, the upper inner wall of the magnetic ring is provided with an annular inclined surface, and the lower end of the annular inclined surface is positioned towards the filter screen.

[0010] Preferably, a drive box is installed through the cylinder, a reducer is installed inside the drive box, a gear is fixed to the shaft end of the reducer, a bearing is installed at the bottom of the mounting ring, a gear ring is fixed on the bearing, and the gear ring meshes with the gear.

[0011] Preferably, it also includes a support base, the upper end of which is equipped with a plurality of support legs, the support legs being fixedly connected to the bottom of the conical cylinder.

[0012] Preferably, it further includes a pumping mechanism for conveying heavy metal treatment liquid into the distribution box. The pumping mechanism includes a conveying pipe that passes through and is fixed on the upper cover. The conveying pipe is rotatably connected to the distribution box. A storage tank and a water pump are installed on the support base. The inlet end of the water pump is connected to the storage tank through an inlet pipe, and the outlet end of the water pump is connected to the conveying pipe through a delivery pipe.

[0013] Preferably, the air extraction mechanism includes a fan installed on the upper end of the support base, an air intake pipe installed at the air inlet end of the fan, the air intake pipe being connected to the cylinder body, and the air intake pipe being located below the rotating plate.

[0014] Preferably, the filter screen has tapered holes running through it from top to bottom, the upper end of the diversion box is tapered, and the diversion box runs through the filter screen.

[0015] Preferably, the filter screen has a structure that is thick in the middle and thin at the edges, with its thickness gradually decreasing from the center to the edge, so that the upper end of the filter screen forms an annular inclined surface.

[0016] This invention also discloses a method for treating sludge for soil remediation, the method comprising the following steps: S1, the sludge is transported to the treatment cylinder through the sludge pipe, and the reducer is started at the same time. The reducer drives the gear and the gear ring to rotate, causing the gear ring, rotating ring, connecting rod and diversion box to rotate. S2, the water pump works, and the heavy metal treatment liquid is transported through the distribution box to multiple connecting pipes and sprayed out through the nozzles in a spiral state; the sprayed heavy metal treatment liquid mixes with the falling sludge to treat the heavy metals in the sludge. S3, the suction mechanism draws air from below the rotating plate to create a negative pressure state, and the sludge mixed with the heavy metal treatment liquid falls onto the rotating plate. The sludge and heavy metal treatment liquid are sprayed out through the conical hole due to the negative pressure. S4, the treated sludge falls into the conical cylinder and is eventually discharged through the sewage pipe.

[0017] Compared with the prior art, the beneficial effects of this invention are as follows: 1. The pumping mechanism thoroughly mixes the chelating agent solution with the spiral-shaped sludge in a spiral liquid flow. The chelating agent can react with heavy metal ions such as lead, cadmium, mercury, and chromium in the sludge to form stable chelates, thereby achieving chemical solidification of heavy metal ions and preventing their re-release and pollution.

[0018] 2. Under the action of sludge sliding and centrifugal force, the magnetic ring can efficiently adsorb ferromagnetic heavy metal particles, completing the initial separation and removal of heavy metals. This reduces the heavy metal load for subsequent deep treatment and improves the overall treatment efficiency. 3. The air extraction mechanism creates a negative pressure under the rotating plate. Combined with the centrifugal force generated by the rotation of the plate, the sludge mixture is atomized and fully dispersed, allowing unreacted heavy metal ions to be fully exposed and react with the chelating agent, ensuring more thorough removal of heavy metal ions.

[0019] In summary, this invention solves the problems of incomplete heavy metal removal and poor purification effect of existing equipment by using multiple treatment methods such as magnetic attraction, spiral mixing, and negative pressure mixing and separation. The treated sludge can meet the subsequent application requirements of soil remediation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a sludge treatment device for soil remediation proposed in this invention; Figure 2 This is a front view of a sludge treatment device for soil remediation proposed in this invention; Figure 3 This is a rear view of a sludge treatment device for soil remediation proposed in this invention; Figure 4 This is a schematic diagram of the internal structure of the drive box in a sludge treatment device for soil remediation proposed in this invention; Figure 5This is a cross-sectional view of a sludge treatment device for soil remediation proposed in this invention; Figure 6 This is a schematic diagram of the structure of the mounting ring and reducer in a sludge treatment device for soil remediation proposed in this invention; Figure 7 This is a schematic diagram of the structure of the sludge treatment equipment for soil remediation proposed in this invention, showing the separation of the mounting ring and the reducer. Figure 8 This is a schematic diagram of the toothed ring structure from an upward viewing angle in a sludge treatment device for soil remediation proposed in this invention; Figure 9 This is a schematic diagram of the connecting rod in a sludge treatment device for soil remediation proposed in this invention.

[0021] In the diagram: 1. Support base, 2. Cylinder body, 3. Conical cylinder, 4. Top cover, 5. Sludge pipe, 6. Air inlet pipe, 7. Liquid delivery pipe, 8. Support leg, 9. Sewage pipe, 10. Fan, 11. Water pump, 12. Liquid storage tank, 13. Suction pipe, 14. Liquid inlet pipe, 15. Drive box, 16. Reducer, 17. Gear, 18. Rotating plate, 19. Vertical rod, 20. Conveying pipe, 21. Mounting ring, 22. Magnetic ring, 23. Annular inclined plane, 24. Filter screen, 25. Diverter box, 26. Conical hole, 27. Gear ring, 28. Rotating ring, 29. Bearing, 30. Connecting rod, 31. Connecting pipe, 32. Spray hole, 33. Mounting groove. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Reference Figures 1-9 A sludge treatment device for soil remediation includes a support base 1, a treatment cylinder, a sludge treatment mechanism, a pumping mechanism, an air extraction mechanism, and a drive mechanism. These components work together to achieve efficient sludge treatment and deep removal of heavy metals. The specific structure is as follows: Four support legs 8 are evenly fixed at the upper end of the support base 1. The upper end of the support legs 8 is fixedly connected to the bottom of the conical cylinder 3 of the treatment cylinder. Through the support of the support legs 8, the entire treatment cylinder is suspended in the air, which facilitates the installation of the sewage pipe 9 and the discharge of sludge, and also avoids corrosion and damage caused by the bottom of the treatment cylinder directly contacting the ground, thus extending the service life of the equipment.

[0024] The treatment cylinder is the core chamber for sludge treatment. It is constructed entirely of corrosion-resistant, high-strength fiberglass, possessing excellent anti-fouling properties and structural stability, effectively withstanding the pressure and chemical corrosion during the sludge treatment process. The treatment cylinder consists of three parts: the cylinder body (2), the conical cylinder (3), and the top cover (4). These three parts are connected by flanges, and sealing gaskets are installed at the joints to ensure the treatment cylinder's airtightness and prevent leakage of sludge and heavy metal treatment liquid, thus avoiding secondary pollution.

[0025] The cylindrical body 2 has a cylindrical structure, with an installation ring 21 fixedly installed on its inner wall. The installation ring 21 is welded to the inner wall of the cylindrical body 2, ensuring a firm connection and preventing it from easily falling off, thus providing stable support for the installation of the sludge treatment mechanism. The conical cylinder 3 is installed at the lower end of the cylindrical body 2, forming a funnel shape. A drain pipe 9 is installed at the center of its bottom, and a control valve is installed on the drain pipe 9. This allows for flexible control of the discharge rate of the treated sludge according to the progress of sludge treatment, while also facilitating cleaning and maintenance after equipment shutdown.

[0026] The top cover 4 is installed on the upper end of the cylinder 2. The upper end of the top cover 4 is respectively connected to the sludge pipe 5 and the air inlet pipe 6. The sludge pipe 5 is used to transport the sludge to be treated into the inside of the treatment cylinder. Its input end is connected to the external sludge conveying equipment, and its output end extends into the inside of the treatment cylinder and is located above the filter screen 24 to ensure that the sludge can fall accurately onto the filter screen 24. The air inlet pipe 6 is used to introduce air into the inside of the treatment cylinder to supplement the air required during the treatment process. At the same time, it can promote the mixing reaction and flow rate of sludge and heavy metal treatment liquid. The air inlet pipe 6 is equipped with a solenoid valve, which can control the opening and closing of the air inlet pipe 6 and the air intake volume, making the operation convenient.

[0027] The sludge treatment mechanism is located inside the treatment cylinder and is the core component for sludge filtration, heavy metal adsorption, and mixing reaction. It mainly includes an installation ring 21, a magnetic ring 22, a rotating ring 28, a diversion box 25, a connecting rod 30, a connecting pipe 31, a filter screen 24, a rotating plate 18, and a vertical rod 19. All components work together to complete the multi-stage treatment of sludge.

[0028] The mounting ring 21 is fixed to the inner wall of the cylinder 2, and a magnetic ring 22 is fixed to its inner wall. The magnetic ring 22 is made of high-strength permanent magnet and has strong magnetism, which can adsorb ferromagnetic heavy metal particles in the sludge and reduce the heavy metal content in the sludge. The upper inner wall of the magnetic ring 22 is provided with an annular inclined surface 23, with the lower end of the annular inclined surface 23 facing the filter screen 24. The purpose of this structure design is that when the sludge falls on the annular inclined surface 23 of the magnetic ring 22, it can slide down the inclined surface onto the filter screen 24 under the action of gravity, avoiding the accumulation of sludge on the magnetic ring 22. At the same time, the magnetic ring 22 can fully adsorb the sludge during the sliding process, improving the heavy metal removal effect.

[0029] A rotating ring 28 is coaxially mounted at the bottom of the mounting ring 21, allowing the rotating ring 28 to rotate flexibly around the axis of the mounting ring 21, reducing friction during rotation and lowering energy consumption during equipment operation. A diversion box 25 is located in the middle of the rotating ring 28. The diversion box 25 has a cylindrical structure with a tapered upper end. This tapered structure prevents sludge from accumulating at the upper end of the diversion box 25 and facilitates sludge sliding onto the filter screen 24.

[0030] The diversion box 25 is connected to the rotating ring 28 by multiple connecting rods 30. Multiple connecting rods 30 are provided and distributed circumferentially on the outside of the diversion box 25. One end of the connecting rod 30 is welded and fixed to the outer wall of the diversion box 25, and the other end is welded and fixed to the inner wall of the rotating ring 28 to ensure that the diversion box 25 and the rotating ring 28 rotate synchronously.

[0031] The bottom of the connecting rod 30 is provided with an installation groove 33, which is a rectangular groove. A connecting pipe 31 is installed inside the groove. The connecting pipe 31 is connected to the inside of the diversion box 25. Multiple spray holes 32 are evenly installed on the connecting pipe 31. The spray holes 32 are set towards the filter screen 24 and are arranged in a spiral shape. This design allows the heavy metal treatment liquid to form a spiral liquid flow when it is sprayed from the spray holes 32, which can fully contact the falling sludge, improve the mixing effect, and thus improve the reaction efficiency of the heavy metal treatment liquid and the heavy metal ions in the sludge.

[0032] A filter screen 24 is rotatably mounted inside the magnetic ring 22. The filter screen 24 is made of stainless steel and has good corrosion resistance and filtration effect. The filter screen 24 has a structure that is thicker in the middle and thinner at the edges. Its thickness gradually decreases from the center to the edge, so that the upper end of the filter screen 24 forms an annular inclined surface. This inclined surface structure cooperates with the annular inclined surface 23 of the magnetic ring 22 to further guide the sludge to slide down, while increasing the contact area between the sludge and the filter screen 24 and improving the filtration effect. It also makes it easier for ferromagnetic heavy metal particles to move towards the magnetic ring 22 so that they can be adsorbed by the magnetic ring 22.

[0033] The diversion box 25 is installed through the filter screen 24, and the filter screen 24 and the diversion box 25 are fitted with a clearance and are provided with a sealing ring.

[0034] The inside of the treatment cylinder is equipped with a rotating plate 18, which is located below the filter screen 24. The rotating plate 18 has a circular structure and is sealed to the inner wall of the cylinder 2. The rotating plate 18 has multiple conical holes 26 running through it from top to bottom. The upper end of the conical hole 26 has a smaller diameter than the lower end. This structural design allows the mixture of sludge and heavy metal treatment liquid to fall in a spray state after passing through the conical holes 26 under negative pressure.

[0035] The rotating plate 18 is connected to the diversion box 25 via the vertical rod 19. The upper end of the vertical rod 19 is welded and fixed to the bottom of the diversion box 25, and the lower end is welded and fixed to the center of the upper end of the rotating plate 18. This allows the rotating plate 18 to rotate synchronously via the vertical rod 19 when the diversion box 25 rotates. The rotation of the rotating plate 18 can further promote the mixing of sludge and heavy metal treatment liquid, while preventing sludge from accumulating on the rotating plate 18.

[0036] The drive mechanism is used to drive the rotating ring 28, the diversion box 25, the connecting rod 30, and the rotating plate 18 to rotate. It mainly includes a drive housing 15, a reducer 16, a gear 17, and a gear ring 27. The drive housing 15 is installed through the side wall of the cylinder 2. The open end of the drive housing 15 has a door with heat dissipation grooves for the reducer 16. The reducer 16 is installed inside the drive housing 15. The input end of the reducer 16 is connected to the motor, and the output end is fixed with the gear 17. The function of the reducer 16 is to reduce the motor speed and increase the output torque, ensuring that the rotating ring 28 and other components can rotate smoothly and powerfully, preventing sludge from splashing due to excessive speed and affecting the treatment effect.

[0037] The gear ring 27 is fixed to the inner ring of the bearing 29, and the rotating ring 28 is fixedly connected to the inner wall of the gear ring 27. The gear ring 27 meshes with the gear 17. When the reducer 16 is working, it drives the gear 17 to rotate, and the gear 17 drives the gear ring 27 to rotate, which in turn drives the rotating ring 28, the diversion box 25, the connecting rod 30 and the rotating plate 18 to rotate synchronously, so as to realize the rotation operation of the sludge treatment mechanism.

[0038] The pumping mechanism is used to deliver heavy metal treatment solution into the diversion box 25. The heavy metal treatment solution uses a chelating agent solution, which can chelate with heavy metal ions in the sludge to form stable chelates, facilitating subsequent separation and removal. The pumping mechanism mainly includes a delivery pipe 20, a storage tank 12, a water pump 11, an inlet pipe 14, and a delivery pipe 7.

[0039] The delivery pipe 20 is fixed to the upper cover 4, and its lower end extends into the processing cylinder and is rotatably connected to the distribution box 25. Specifically, a rotary joint is used to ensure that the delivery pipe 20 remains fixed when the distribution box 25 rotates, and that no liquid leakage occurs. The storage tank 12 and the water pump 11 are both installed on the upper end of the support base 1. The storage tank 12 is used to store the heavy metal treatment liquid. It has a liquid filling port at the top for easy replenishment of the treatment liquid, and a drain port at the bottom for easy cleaning of impurities inside the storage tank 12. The inlet of the water pump 11 is connected to the storage tank 12 via the inlet pipe 14. The inlet pipe 14 is equipped with a filter to filter out impurities in the treatment liquid in the storage tank 12, preventing blockage of the connecting pipe 31 and the nozzle 32. The outlet of the water pump 11 is connected to the delivery pipe 20 via the delivery pipe 7. The delivery pipe 7 is equipped with a pressure gauge and a flow control valve to monitor the delivery pressure and flow rate in real time. Operators can flexibly adjust the delivery parameters of the treatment liquid according to the amount of sludge to ensure that the delivery volume of the heavy metal treatment liquid matches the amount of sludge to be treated, thereby improving the treatment effect and avoiding waste of the treatment liquid.

[0040] The suction mechanism is used to create a negative pressure environment in the space below the rotating plate 18 inside the treatment cylinder. This negative pressure promotes the mixing reaction between the sludge and the heavy metal treatment liquid. It mainly includes a blower 10 and a suction pipe 13. The blower 10 is mounted on the upper end of the support base 1 and is a centrifugal blower, characterized by high suction efficiency, low noise, and stable operation. The suction pipe 13 is installed at the air inlet of the blower 10. The other end of the suction pipe 13 is connected to the cylinder 2, and the connection point of the suction pipe 13 is located below the rotating plate 18, ensuring that the blower 10 can extract the air below the rotating plate 18 during operation, creating a negative pressure environment in that area. The suction pipe 13 is equipped with a filter screen to remove impurities and sludge particles from the air, preventing them from entering the blower 10 and causing damage to its components.

[0041] This invention also discloses a method for treating sludge for soil remediation, the method comprising the following steps: S1. Equipment debugging and sludge feeding: Start the drive mechanism to rotate the relevant components. Before carrying out sludge treatment operations, conduct a comprehensive debugging of the entire equipment to ensure that all components are operating normally and to avoid malfunctions that could affect the treatment effect. The specific debugging process is as follows: Check the fixing of the support base 1 and support legs 8 to ensure that the equipment is installed firmly and without any looseness; check the sealing of the treatment cylinder, open the top cover 4, check whether the sealing gasket at the flange connection is intact, close the top cover 4, and introduce a small amount of air into the treatment cylinder through the air inlet pipe 6 to observe whether there is any air leakage. If there is any air leakage, replace the sealing gasket in time. Check the pumping mechanism, inject sufficient heavy metal treatment solution (chelating agent solution) into the storage tank 12, start the water pump 11, observe the pressure gauge and flow control valve on the delivery pipe 7, adjust the flow rate to a suitable range to ensure that the heavy metal treatment solution can be smoothly delivered to the distribution box 25 and sprayed out from the nozzle 32, check whether the connecting pipe 31 and the nozzle 32 are blocked, and clean them in time if there is any blockage; check the suction mechanism, start the fan 10, observe the operating status of the fan 10, check whether the suction pipe 13 is unobstructed, and ensure that the rotating plate 18 A stable negative pressure state can be formed below; check the drive mechanism, start the external motor, drive the gear 17 and gear ring 27 to rotate through the reducer 16, observe the rotation status of the rotating ring 28, the diverter box 25, the connecting rod 30 and the rotating plate 18, ensure that the rotation is smooth and there are no jamming, abnormal noise or other phenomena, adjust the speed of the reducer 16 to keep the speed of the rotating parts in a suitable range (in this embodiment, the speed is adjusted to 30-50 r / min). Too fast a speed will cause sludge to splash, and too slow a speed will affect the mixing effect.

[0042] After the equipment is debugged, sludge feeding begins. This includes a sludge pretreatment step: the sludge to be treated is first transported to the screen of the pretreatment unit, where large impurities are filtered out. Then it enters the sedimentation tank, where some of the sludge is removed by sedimentation. The pretreated sludge is then transported to the treatment cylinder through sludge pipe 5 for subsequent processing. The sludge to be treated is transported to sludge pipe 5 via an external sludge conveying device. The sludge enters the treatment cylinder through sludge pipe 5 and is discharged from the output end of sludge pipe 5, landing on the upper end of filter screen 24. At this time, reducer 16 continues to operate, driving gear 17 to rotate. Since gear 17 meshes with gear ring 27, gear ring 27 rotates synchronously under the drive of gear 17. Gear ring 27 drives rotating ring 28 to rotate smoothly around the axis of mounting ring 21. When rotating ring 28 rotates, it drives diversion box 25 to rotate synchronously via connecting rod 30. Diversion box 25, in turn, drives rotating plate 18 to rotate synchronously via vertical rod 19, thus realizing the rotation operation of the core components of the sludge treatment mechanism.

[0043] The annular inclined structure of the filter screen 24, which is thick in the middle and thin at the edges, works in conjunction with the annular inclined surface 23 of the magnetic ring 22. This allows the sludge falling from the sludge pipe 5 to slide evenly down the inclined surface under the action of gravity and centrifugal force, preventing the sludge from accumulating in one place. Finally, the sludge falls through the filter screen 24. At the same time, the magnetic ring 22 begins to function, adsorbing ferromagnetic heavy metal particles in the sludge during the sliding process, initially removing some of the heavy metals in the sludge, and achieving preliminary purification of heavy metals.

[0044] S2, pumping heavy metal treatment liquid to achieve spiral mixing with sludge and heavy metal chelation reaction; Simultaneously with sludge feeding, water pump 11 is started. Pump 11 begins operation, drawing heavy metal treatment solution (chelating agent solution) from storage tank 12 through inlet pipe 14. The filter on inlet pipe 14 removes impurities from the treatment solution, preventing them from entering connecting pipe 31 and nozzle 32 and causing blockages. After being pressurized by water pump 11, the treatment solution is transported to delivery pipe 20 through delivery pipe 7. Because delivery pipe 20 is connected to distribution box 25 via a rotary joint, delivery pipe 20 remains fixed during the rotation of distribution box 25, allowing the treatment solution to smoothly enter the distribution box 25.

[0045] The heavy metal treatment liquid entering the distribution box 25 is evenly distributed into the connecting pipes 31 at the bottom of multiple connecting rods 30 under the diversion action of the distribution box 25. The multiple spray holes 32 on the connecting pipes 31 are spirally distributed, and the distribution box 25 is in a rotating state. Therefore, when the treatment liquid is sprayed out from the spray holes 32, a spiral liquid flow will be formed. At the same time, the sludge falling through the filter screen 24 is also in a spiral state, so that the heavy metal treatment liquid and the sludge are in full contact. At this time, the rotating ring 28 drives the connecting rod 30 and the connecting pipe 31 to rotate synchronously, so that the spiral-shaped treatment liquid sprayed from the nozzle 32 can be continuously and evenly mixed with the sludge; finally, the heavy metal treatment liquid and sludge fully contact each other and fall onto the rotating plate 18; at the same time, the rotating plate 18 rotates synchronously under the drive of the vertical rod 19, and the centrifugal force generated by its rotation can further promote the mixing of sludge and treatment liquid, so that each part of sludge can fully contact the treatment liquid and avoid uneven mixing. The chelating agent in the heavy metal treatment liquid will undergo a chelation reaction with the heavy metal ions (such as lead, cadmium, mercury, chromium, etc.) in the sludge to form stable chelates.

[0046] The spirally distributed nozzles 32 on the connecting pipe 31, combined with the rotation of the diversion box 25, form a spiral liquid flow, which greatly increases the contact area between the treatment liquid and the sludge, prolongs the contact time, and improves the efficiency of the chelation reaction. At the same time, the magnetic ring 22 continuously adsorbs ferromagnetic heavy metal particles in the sludge, which works in conjunction with the chelation reaction to achieve dual removal of heavy metals and further improve the purification effect.

[0047] S3, the suction mechanism is activated to create negative pressure, promoting the separation and deep treatment of the mixed liquid. While the sludge and heavy metal treatment liquid are fully mixed and undergo a chelation reaction, the blower 10 of the suction mechanism is activated. The blower 10 starts working and extracts the air below the rotating plate 18 in the treatment cylinder through the suction pipe 13, so that the space below the rotating plate 18 is in a stable negative pressure state (in this embodiment, the negative pressure value is adjusted to -0.03 to -0.05 MPa). At this time, the solenoid valve on the air inlet pipe 6 can be opened appropriately according to the reaction requirements to introduce air into the treatment cylinder and prevent negative pressure from forming in the space above the rotating plate 18 in the treatment cylinder. Because the area below the rotating plate 18 is under negative pressure, while the area above it is under normal pressure, the sludge mixture that falls above the rotating plate 18 and is thoroughly mixed with the heavy metal treatment solution is rapidly drawn into the conical orifice 26 on the rotating plate 18 under the influence of the pressure difference. The conical orifice 26 on the rotating plate 18 has a structure with a small diameter at the upper end and a large diameter at the lower end. This structural design can accelerate the flow rate of the mixture / increase the flow rate of the mixture, while preventing the mixture from clogging in the conical orifice 26, ensuring that the mixture can pass smoothly through the rotating plate 18 and enter the space below the rotating plate 18.

[0048] During the process of the mixed liquid passing through the conical orifice 26, due to the sudden change in pressure, the mixed liquid will be atomized to a certain extent. The atomized mixed liquid can further increase the contact area with the air. At the same time, the continuous rotation of the rotating plate 18 will generate centrifugal force. Under the combined action of centrifugal force and negative pressure, the water and some fine sludge particles in the mixed liquid will be further separated. The water will be drawn out by the fan 10 along with the air and discharged outside the equipment through the suction pipe 13 (the discharged air contains a small amount of water and fine particles. A condenser and filter can be installed at the outlet of the suction pipe 13 to treat the air before discharge to avoid secondary pollution). The sludge particles containing chelates will slide down into the conical cylinder 3 under the action of gravity.

[0049] In this step, the negative pressure created by the suction mechanism is crucial for achieving mixed liquid separation. Through the negative pressure, not only is the flow of the mixed liquid accelerated, promoting the separation of water and sludge particles, but also the fine particles in the sludge are fully exposed, allowing them to react further with the unreacted heavy metal treatment liquid, ensuring thorough removal of heavy metal ions. The centrifugal force generated by the rotation of the rotating plate 18, in conjunction with the negative pressure, further enhances the separation efficiency and treatment effect. At the same time, the filter screen 24 continuously performs its filtering function, filtering out larger particulate impurities in the sludge and preventing larger particles from entering the conical holes 26 of the rotating plate 18 and causing blockage, thus ensuring the normal operation of the equipment.

[0050] S4. The treated sludge is collected and discharged, completing the entire sludge treatment process. After the above steps, most of the heavy metal ions in the sludge are removed, and the resulting chelates mix with the sludge particles, sliding down into the conical cylinder 3 under gravity. When the sludge in the conical cylinder 3 accumulates to a certain amount, the control valve on the drain pipe 9 is opened, and the treated sludge is discharged from the equipment through the drain pipe 9 under gravity for sedimentation and separation.

[0051] The sludge treatment equipment for soil remediation of the present invention: A driving mechanism drives a rotating ring 28, a diversion box 25, a connecting rod 30, and a rotating plate 18 to rotate, allowing sludge entering from the sludge pipe 5 to slide evenly down the inclined surfaces of the filter screen 24 and the magnetic ring 22. The magnetic ring 22 initially adsorbs ferromagnetic heavy metal particles in the sludge. A pumping mechanism delivers the heavy metal treatment liquid to the diversion box 25, which is then sprayed out through the spiral nozzle 32 on the connecting pipe 31, forming a spiral liquid flow that fully mixes with the sludge during rotation. The chelating agent in the treatment liquid chelates with the heavy metal ions in the sludge, forming stable chelates. An air extraction mechanism draws air from below the rotating plate 18 to a negative pressure state. Under the action of pressure difference and centrifugal force, the mixed liquid passes through the conical hole 26 of the rotating plate 18, achieving separation of water and sludge particles, while simultaneously promoting further reaction of unreacted heavy metal ions. Finally, the treated sludge falls into the conical cylinder 3 under gravity and is discharged through the sewage pipe 9, completing the entire sludge treatment process.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sludge treatment device for soil remediation, comprising a support base (1), characterized in that, The upper end of the support base (1) is provided with a processing cylinder, and a sludge treatment mechanism is provided inside it; The sludge treatment mechanism includes an installation ring (21) disposed inside the treatment cylinder. A magnetic ring (22) is fixed to the inner wall of the installation ring (21). A rotating ring (28) is coaxially disposed at the bottom of the installation ring (21). A diversion box (25) is disposed in the middle of the rotating ring (28). The diversion box (25) is connected to the rotating ring (28) through multiple connecting rods (30). An installation groove (33) is disposed at the bottom of the connecting rod (30). A connecting pipe (31) connected to the diversion box (25) is installed in the installation groove (33). Multiple spray holes (32) are installed on the connecting pipe (31). A filter screen (24) connected to the connecting rod (30) is rotatably disposed inside the magnetic ring (22). The processing cylinder is provided with a rotating plate (18) inside. The rotating plate (18) has multiple conical holes (26) running through it from top to bottom. The rotating plate (18) is connected to the diversion box (25) through a vertical rod (19). It also includes an air extraction mechanism, which is connected to the processing cylinder and located below the rotating plate (18). The operation of the air extraction mechanism puts the space below the rotating plate (18) of the processing cylinder into a negative pressure state.

2. The sludge treatment equipment for soil remediation according to claim 1, characterized in that, The processing cylinder includes a cylinder body (2), a conical cylinder (3) is installed at the lower end of the cylinder body (2), a sewage pipe (9) is installed at the bottom of the conical cylinder (3), a top cover (4) is installed at the upper end of the cylinder body (2), a sludge pipe (5) and an air inlet pipe (6) are installed at the upper end of the top cover (4), and a solenoid valve is installed on the air inlet pipe (6). The mounting ring (21) is fixed to the inner wall of the cylinder (2).

3. The sludge treatment equipment for soil remediation according to claim 1, characterized in that, The upper inner wall of the magnetic ring (22) is provided with an annular inclined surface (23), and the lower end of the annular inclined surface (23) is set towards the filter screen (24).

4. The sludge treatment equipment for soil remediation according to claim 2, characterized in that, A drive box (15) is installed through the cylinder (2). A reducer (16) is installed inside the drive box (15). A gear (17) is fixed to the shaft end of the reducer (16). A bearing (29) is installed at the bottom of the mounting ring (21). A gear ring (27) is fixed on the bearing (29). The gear ring (27) meshes with the gear (17).

5. The sludge treatment equipment for soil remediation according to claim 2, characterized in that, It also includes a support base (1), on the upper end of which a plurality of support legs (8) are installed, and the support legs (8) are fixedly connected to the bottom of the conical cylinder (3).

6. The sludge treatment equipment for soil remediation according to claim 5, characterized in that, It also includes a pumping mechanism for conveying heavy metal treatment liquid into the diversion box (25). The pumping mechanism includes a conveying pipe (20) that passes through and is fixed on the upper cover (4). The conveying pipe (20) is rotatably connected to the diversion box (25). A storage tank (12) and a water pump (11) are installed on the support base (1). The inlet end of the water pump (11) is connected to the storage tank (12) through the inlet pipe (14). The outlet end of the water pump (11) is connected to the conveying pipe (20) through the delivery pipe (7).

7. The sludge treatment equipment for soil remediation according to claim 5, characterized in that, The air extraction mechanism includes a fan (10) installed on the upper end of the support base (1). The air inlet end of the fan (10) is equipped with an air suction pipe (13). The air suction pipe (13) is connected to the cylinder (2) and is located below the rotating plate (18).

8. The sludge treatment equipment for soil remediation according to claim 1, characterized in that, The filter screen (24) has tapered holes running through it from top to bottom. The upper end of the diversion box (25) is tapered and the diversion box (25) runs through the filter screen (24).

9. The sludge treatment equipment for soil remediation according to claim 1, characterized in that, The filter (24) has a structure that is thick in the middle and thin at the edges, with its thickness gradually decreasing from the center to the edge, so that the upper end of the filter (24) forms an annular inclined surface.

10. A method for treating sludge in soil remediation, characterized in that, Applied to the sludge treatment equipment according to any one of claims 1-9, the method comprises the following steps: S1, the sludge is transported to the treatment cylinder through the sludge pipe (5), and the reducer (16) is started at the same time. The reducer (16) drives the gear (17) and the gear ring (27) to rotate, so that the gear ring (27), the rotating ring (28), the connecting rod (30) and the diversion box (25) rotate. S2, the water pump (11) works, and the heavy metal treatment liquid is transported through the diversion box (25) to multiple connecting pipes (31) and sprayed out through the nozzle (32) in a spiral state; the sprayed heavy metal treatment liquid mixes with the falling sludge to treat the heavy metals in the sludge. S3, the suction mechanism draws air from below the rotating plate (18) to put it in a negative pressure state, and the sludge mixed with the heavy metal treatment liquid falls onto the rotating plate (18). The sludge and heavy metal treatment liquid are sprayed out through the conical hole (26) due to the negative pressure. S4, the treated sludge falls into the conical cylinder (3) and is eventually discharged through the sewage pipe (9).

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