Pretreatment method of industrial park hazardous waste sludge

Abstract

The application discloses an industrial park hazardous waste sludge pretreatment method in the technical field of hazardous waste sludge pretreatment, and comprises the following steps: S1, adding inorganic acid to hazardous waste sludge and stirring and reacting; S2, adding ferrous salt and hydrogen peroxide to the hazardous waste sludge after step S1 in sequence, and carrying out oxidation reaction under acidic conditions; S3, adding alkaline substances to the hazardous waste sludge after step S2, then adding a composite stabilizer containing sulfide and phosphate, stirring and reacting; S4, putting the hazardous waste sludge after step S3 into a hazardous waste sludge dewatering device to carry out dewatering, and obtaining a sludge cake. The application creates the best acidic environment for oxidation by pretreating hazardous waste sludge with inorganic acid, improves the oxidation efficiency of ferrous salt and hydrogen peroxide, improves the dewatering channel while degrading organic matters, and finally efficiently fixes heavy metals under alkaline conditions, then carries out dewatering treatment on the hazardous waste sludge, and realizes the reduction, harmlessness and resource utilization of the hazardous waste sludge.

Description

Technical Field

[0001] This invention relates to the field of hazardous waste sludge pretreatment, specifically to a method for the pretreatment of hazardous waste sludge in industrial parks. Background Technology

[0002] Currently, hazardous waste sludge from industrial parks is typically co-processed with treated fly ash (dust and residue generated during waste incineration) in cement kilns through high-temperature calcination. This is because the main components of fly ash and hazardous waste sludge incineration are CaO, SiO2, Al2O3, and Fe2O3, similar to the main components of cement. Furthermore, the combustion of organic matter generates a large amount of heat, making them suitable as alternative raw materials for cement production. This achieves the reduction, harmlessness, and resource recovery of hazardous waste sludge and fly ash. However, hazardous waste sludge often requires pretreatment before entering the cement kiln for high-temperature calcination. Traditional pretreatment typically involves dewatering the sludge, as illustrated by the high-efficiency anti-clogging sludge thickening and dewatering tank proposed in publication number CN116986782B. While this tank can dewater hazardous waste sludge, it still has the following drawbacks: 1. Before dewatering, the hazardous waste sludge was not treated with heavy metal stabilization and organic matter degradation. Direct pressure filtration will cause heavy metals to leach out with the filtrate, causing secondary pollution. At the same time, undegraded organic matter remains in the sludge cake, which will affect the product safety and process stability in the subsequent cement kiln co-processing process. Although the sludge thickening and dewatering tank can dewater the hazardous waste sludge, after dewatering in the sludge dewatering frame, the hazardous waste sludge is unloaded onto the conveyor belt by an electric mechanical gripper. This method not only makes it easy for the hazardous waste sludge to fall into the outside during the gripping process, causing material loss and environmental pollution, but also has poor unloading efficiency and is prone to residue, which seriously affects the continuity and stability of subsequent dewatering operations. 2. While pressing hazardous waste sludge into the dewatering frame using a downward-facing dewatering plate can achieve dewatering, the sludge's viscosity leads to significant sludge adhesion to the pressing surface as the plate returns to its original position. This reduces material recovery and gradually weakens the dewatering effect due to surface contamination. Therefore, we propose a pretreatment method for hazardous waste sludge in industrial parks. Summary of the Invention

[0003] The purpose of this invention is to provide a pretreatment method for hazardous waste sludge in industrial parks. This method solves the technical problems of existing methods where heavy metal stabilization and organic matter degradation treatment are not performed on hazardous waste sludge before dewatering. Direct pressure filtration will cause heavy metals to leach out with the filtrate, resulting in secondary pollution. At the same time, undegraded organic matter remains in the sludge cake, which will affect the product safety and process stability in the subsequent cement kiln co-processing process.

[0004] The present invention achieves the above objectives through the following technical solutions: The pretreatment method for hazardous waste sludge in industrial parks includes the following steps: S1: Add inorganic acid to hazardous waste sludge and stir the reaction at 40-80℃ for 10-60 minutes; S2: Ferrous salt and hydrogen peroxide are added sequentially to the hazardous waste sludge after treatment in step S1, and an oxidation reaction is carried out under acidic conditions; S3: Add alkaline substances to the hazardous waste sludge treated in step S2 to adjust the pH to 8-11, then add a composite stabilizer containing sulfides and phosphates, and stir to react; S4: The hazardous waste sludge treated in step S3 is fed into a hazardous waste sludge dewatering equipment for dewatering to obtain pretreated sludge cake. The hazardous waste sludge dewatering equipment includes a treatment shell, inside which is a rotating device. A support frame is located at the output end of the rotating device. Several sets of rotating arms are connected to an elastic rotating shaft on the outer wall of the support frame. Each rotating arm is connected to a hazardous waste sludge dewatering mechanism. A bearing frame, which rotatably fits against the bottom of the rotating arm, is located on the outer wall of the support frame. An opening corresponding to a rotating arm is provided on the bearing frame for the rotating arm to rotate into. A top rod is movably installed within the opening, and the top rod is connected to a telescopic drive component that drives its lifting and lowering. Feeding components and dewatering pressing mechanisms are respectively located on both sides of the treatment shell. The feeding components and dewatering pressing mechanisms correspond to a hazardous waste sludge dewatering mechanism, and the dewatering pressing mechanism corresponds to the opening.

[0005] A further improvement is that the hazardous waste sludge dewatering equipment also includes a conveying component, one end of which passes through an opening on one side of the processing housing and extends to the bottom of the hazardous waste sludge dewatering mechanism of the corresponding dewatering and covering mechanism. The sludge dewatering mechanism includes a filter frame, with a sealing plate connected to an elastic rotating shaft on the outside of the filter frame. An opening and closing drive is provided on the filter frame. When the telescopic drive drives the top rod to descend to a preset position, the corresponding rotating arm swings downward and tilts the filter frame, thereby opening the sealing plate and allowing the hazardous waste sludge in the filter frame to fall onto the conveyor.

[0006] A further improvement is that the support frame is connected to the water receiving seat through a bracket, the water receiving seat is movably sleeved on the outer wall of the output end of the rotating device and located below the support frame, and the water receiving seat is fixed to the inner wall of the processing housing; The telescopic drive component includes a movable frame that is connected to the bottom end of a top rod and movably sleeved on the output end of a rotating device. The movable frame is connected to a support through the telescopic device. The bottom of the movable frame is provided with a vibration generating part, which is used to make the filter frame vibrate after the filter frame is tilted.

[0007] A further improvement is that the vibration generating unit includes a vibration device mounted on the movable frame for driving it to vibrate, and a detection sensor mounted on the water receiving seat for detecting the position of the movable frame. When the detection sensor detects that the telescopic device is driving the movable frame to move to a preset position, the vibration device is controlled to work.

[0008] A further improvement is that the opening and closing drive component includes a counterweight block slidably disposed on the side wall of the filter frame and facing one end of the rotating arm. One end of the counterweight block is connected to a pull rope, and the other end of the pull rope passes around a guide roller structure disposed at the bottom of the filter frame and is connected to a sealing plate. After the filter frame tilts, the counterweight block slides away from the rotating arm, thereby pulling the sealing plate to flip open by the pull rope. The outer wall of the filter frame is also provided with an elastic element for driving the counterweight block to reset when the filter frame is reset. The counterweight block is also connected to a scraper, which is disposed inside the filter frame and facing one side of the rotating arm.

[0009] A further improvement is that the dewatering and pressing mechanism includes a telescopic device two disposed on the inner wall of the processing shell, a pressing block disposed at the output end of the telescopic device two and used to enter the hazardous waste sludge dewatering mechanism, the height of the pressing block being greater than the height of the inner cavity of the hazardous waste sludge dewatering mechanism, a winding roller being rotatably provided on both sides of the top of the pressing block, a rotating device two being provided on the shaft of the winding roller to drive it to rotate, and an anti-sticking cloth being covered on the bottom of the outer wall of the pressing block, the two ends of the anti-sticking cloth being wound around the outer wall of the two winding rollers respectively.

[0010] A further improvement is that the output end of the telescopic device is provided with a connecting plate, which is slidably connected to the guide rail on the pressure block via a slider. The slider and the inner wall of one side of the guide rail are connected by an elastic element. The top of the side of the pressure block facing the inner wall of the processing housing is provided with a guide frame. The side of the guide frame away from the pressure block is provided with an inclined edge, the top of which is located inside the bottom end. The inner wall of the processing housing is provided with a top rod that cooperates with the inclined edge. After the pressure block moves upward away from the hazardous waste sludge dewatering mechanism, the top rod contacts the inclined edge to drive the pressure block to move towards the support frame. The bottom of the guide frame is provided with a scraper, one end of which contacts the outer wall of the anti-stick cloth.

[0011] A further improvement is that a movable plate is movably provided in the inner cavity of the pressing block. The movable plate is connected to the inner wall of the pressing block through an elastic element. The movable plate is provided with several sets of impact blocks for contacting the inner wall of the pressing block. A permanent magnet wheel is rotatably provided on the movable plate. A rotating roller is rotatably provided in the inner cavity of the pressing block above the permanent magnet wheel. An arc-shaped permanent magnet block is embedded in the outer wall of the rotating roller for attracting the permanent magnet wheel to drive the movable plate to move upward. The shaft of the rotating roller is connected to the output end of the rotating device.

[0012] A further improvement is that the inner wall of the treatment housing, above the hazardous waste sludge dewatering mechanism, is provided with an injection component for injecting anti-sticking liquid and a cleaning component for injecting cleaning liquid. The injection component and the cleaning component are respectively located on both sides of the treatment housing and correspond to a hazardous waste sludge dewatering mechanism. The injection component and the cleaning component are both located between the feeding component and the dewatering and pressing mechanism. The injection component and the cleaning component have the same structure. The injection component includes a diversion seat fixed to the inner wall of the treatment housing. One end of the diversion seat is connected to an inlet pipe. The diversion seat is connected to a nozzle for injecting anti-sticking liquid into the corresponding hazardous waste sludge dewatering mechanism.

[0013] The beneficial effects of this invention are as follows: This invention creates an optimal acidic environment for oxidation by pretreating hazardous waste sludge with inorganic acids, significantly improving the oxidation efficiency of ferrous salts and hydrogen peroxide. It also further improves the dehydration channel while degrading organic matter. Finally, it efficiently fixes heavy metals under alkaline conditions, achieving heavy metal stabilization. The hazardous waste sludge is then dehydrated, achieving volume reduction, harmlessness, and resource recovery, ensuring product safety and process stability in subsequent cement kiln co-processing. Furthermore, the hazardous waste sludge dewatering equipment used in this application uses a telescopic drive to lower the top rod, causing the rotating arm to automatically tilt the filter frame for unloading, improving unloading efficiency. When the filter frame tilts, the opening and closing drive simultaneously opens the sealing plate, allowing the dewatered hazardous waste sludge to efficiently fall onto the conveyor under gravity, further improving unloading efficiency and smoothness, and preventing it from falling into the environment. 2) The dewatering and pressing mechanism set up in this invention effectively prevents hazardous waste sludge from adhering by using anti-stick cloth. After dewatering, the winding roller is rotated synchronously by the rotating device to update the anti-stick cloth section in contact with the hazardous waste sludge. In conjunction with the scraper, the hazardous waste sludge on the anti-stick cloth is scraped off into the corresponding filter frame. This not only achieves self-cleaning of the anti-stick cloth surface, but also ensures the material recovery rate. It effectively avoids the technical problem of gradually weakening the dewatering effect due to the contamination of the pressing surface, and ensures continuous and efficient dewatering operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the steps in the hazardous waste sludge pretreatment method of the present invention; Figure 2 This is a schematic diagram of the hazardous waste sludge dewatering equipment of the present invention; Figure 3 For the present invention Figure 2 Another perspective structural diagram; Figure 4 For the present invention Figure 2 Structural sectional view; Figure 5 For the present invention Figure 2 Schematic diagram of internal local structure; Figure 6 For the present invention Figure 5 Another perspective structural diagram; Figure 7 This is a schematic diagram of the hazardous waste sludge dewatering mechanism of the present invention; Figure 8 For the present invention Figure 7 Another perspective structural diagram; Figure 9 This is a schematic diagram of the dehydration and pressing mechanism of the present invention; Figure 10 For the present invention Figure 9 Structural sectional view.

[0015] In the diagram: 1. Processing shell; 2. Rotating device one; 3. Support frame; 4. Rotating arm; 5. Hazardous waste sludge dewatering mechanism; 51. Filter frame; 52. Sealing plate; 53. Pull rope; 54. Counterweight; 55. Elastic component one; 56. Scraper one; 6. Bearing frame; 7. Movable port; 8. Top rod one; 9. Movable frame; 10. Telescopic device one; 11. Support one; 12. Vibration device; 13. Detection sensor; 14. Through port; 15. Water receiving base; 16. 17. Feeding component; 18. Conveying component; 19. Diverter seat; 20. Nozzle; 21. Liquid inlet pipe; 22. Dehydration and pressing mechanism; 211. Telescopic device II; 212. Pressing block; 213. Winding roller; 214. Rotating device II; 215. Anti-stick cloth; 216. Top rod II; 217. Guide frame; 218. Connecting plate; 219. Guide rail; 220. Permanent magnet wheel; 221. Rotating roller; 222. Scraper II; 223. Movable plate; 224. Impact block. Detailed Implementation

[0016] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0017] Example 1

[0018] Please see the appendix Figure 1-8 The pretreatment method for hazardous waste sludge in industrial parks includes the following steps: S1: Add inorganic acid to hazardous waste sludge and stir the reaction at 40-80℃ for 10-60 minutes to destroy the colloidal structure and microbial cells of hazardous waste sludge; in this embodiment, the inorganic acid is one or more of sulfuric acid, hydrochloric acid or nitric acid, and the amount added is to adjust the pH value of the sludge system to 2-4. More preferably, the heating temperature is 60℃ and the reaction time is 30 minutes. S2: Ferrous salt and hydrogen peroxide are added sequentially to the hazardous waste sludge treated in step S1, and an oxidation reaction is carried out under acidic conditions. This step involves the Fenton reaction to degrade organic pollutants and further improve dewatering performance. In this embodiment, the ferrous salt is ferrous sulfate heptahydrate, and the amount of hydrogen peroxide added is proportional to the organic matter content in the hazardous waste sludge. The molar ratio of ferrous salt to hydrogen peroxide is 1:3 to 1:10. The oxidation reaction is carried out at room temperature for 30-120 minutes. S3: Add alkaline substances to the hazardous waste sludge treated in step S2 to adjust the pH to 8-11, then add a composite stabilizer containing sulfides and phosphates, and stir to react. Through this step, the leached heavy metals are converted into stable sulfide and phosphate precipitates. In this embodiment, the alkaline substance is one or more of calcium hydroxide, sodium hydroxide, or calcium oxide. In the composite stabilizer, the sulfide is sodium sulfide, and the phosphate is disodium hydrogen phosphate or sodium tripolyphosphate. The dosage is determined according to the total amount of heavy metals in the hazardous waste sludge. The molar ratio of sulfide to heavy metals is 1.2:1 to 2:1, and the molar ratio of phosphate to heavy metals is 1:1 to 1.5:1. S4: The hazardous waste sludge treated in step S3 is fed into a hazardous waste sludge dewatering equipment for dewatering to obtain pretreated sludge cake. This embodiment creates an optimal acidic environment for oxidation through "acid-heat" pretreatment, which greatly improves the oxidation efficiency of ferrous salts and hydrogen peroxide. While degrading organic matter, "oxidation" further improves the dehydration channel. Finally, "stabilization" efficiently fixes heavy metals under alkaline conditions. Subsequently, the hazardous waste sludge is dehydrated to achieve the reduction, harmlessness and resource utilization of hazardous waste sludge. In this embodiment, S5 is preferably also included: the pretreated mud cake, the treated fly ash (the product of waste incineration), and some cement raw materials (such as limestone, coal powder, etc.) are fed into the cement processing equipment to manufacture cement, so as to further realize the reduction, resource utilization, and harmless treatment of hazardous waste sludge in the industrial park.

[0019] The hazardous waste sludge dewatering equipment includes a treatment shell 1, which has a circular cross-section in this embodiment. The processing housing 1 contains a rotating device 2 (such as a stepper motor and a reducer). The output end of the rotating device 2 is equipped with a support frame 3. The support frame 3 has a circular cross-section. Several sets of rotating arms 4 are elastically connected to the outer wall of the support frame 3 via a rotating shaft. In this embodiment, at least four sets of rotating arms 4 are provided. The rotating arms 4 are elastically connected to the outer wall of the support frame 3 via a rotating shaft seat, a rotating shaft, and a torsion spring. A hazardous waste sludge dewatering mechanism 5 is connected to the rotating arms 4. A bearing frame 6, which rotatably fits against the bottom of the rotating arms 4, is provided on the outer wall of the support frame 3 via bearings. The bearing frame 6 supports the rotating arms 4, ensuring that the rotating arms 4 and the hazardous waste sludge dewatering mechanism 5 maintain a stable horizontal posture. An opening 7 is provided on the bearing frame 6 corresponding to the position of each rotating arm 4, allowing the rotating arm 4 to rotate in. When the rotating arm 4 corresponds to the movable opening 7, because it loses the support of the support frame 6, under the action of the gravity of the hazardous waste sludge dewatering mechanism 5 and the torsion spring, the rotating arm 4 drives the hazardous waste sludge dewatering mechanism 5 to rotate to the movable opening 7 to an inclined position. The movable opening 7 is equipped with a top rod 8. In this embodiment, the top of the top rod 8 is embedded with a ball for sliding contact with the hazardous waste sludge dewatering mechanism 5. When the top rod 8 does not move downward, the top surface of the ball is flush with the top surface of the support frame 6, so that the top rod 8 supports the rotating arm 4 when it does not move downward, avoiding interference with the rotation of the rotating arm 4 with the support frame 3. The top rod 8 is connected to a telescopic drive component that drives its lifting and lowering. When the telescopic drive component drives the top rod 8 downward, the rotating arm 4 corresponding to the movable opening 7 rotates to an inclined position. The processing housing 1 is provided with a feeding component 16 for injecting hazardous waste sludge into the hazardous waste sludge dewatering mechanism 5 and a dewatering and pressing mechanism 21 for pressurizing the hazardous waste sludge in the hazardous waste sludge dewatering mechanism 5 on both sides. The feeding component 16 and the dewatering and pressing mechanism 21 are respectively corresponding to a hazardous waste sludge dewatering mechanism 5. Optionally, the feeding component 16 in this embodiment includes a feeding hopper and a feeding pipe connected to the feeding hopper. One end of the feeding pipe passes through the processing housing 1 and corresponds to a hazardous waste sludge dewatering mechanism 5. A valve body can be installed in the feeding pipe. The hazardous waste sludge can enter the hazardous waste sludge dewatering mechanism 5 through the feeding component 16, and the amount of hazardous waste sludge entering can be controlled. Of course, the feeding component 16 is not limited to this one. The dewatering and pressing mechanism 21 is used to enter the hazardous waste sludge dewatering mechanism 5 and give pressure to the hazardous waste sludge in the hazardous waste sludge dewatering mechanism 5, thereby squeezing out the water in the hazardous waste sludge and realizing the dewatering of the hazardous waste sludge. The dewatering and covering mechanism 21 corresponds to the movable opening 7. That is, the hazardous waste sludge dewatering mechanism 5 located at the movable opening 7 corresponds directly to the dewatering and covering mechanism 21, so that the hazardous waste sludge in the hazardous waste sludge dewatering mechanism 5 can be dewatered by the dewatering and covering mechanism 21 and then the hazardous waste sludge in the hazardous waste sludge dewatering mechanism 5 can be unloaded. Preferably, in this embodiment, the hazardous waste sludge dewatering equipment also includes a conveyor 17, which can be a conveyor belt device. Of course, through holes can be opened on the conveyor belt device to prevent moisture from remaining on the conveyor belt device, which will not be described in detail here. One end of the conveyor 17 passes through the through-hole 14 opened on one side of the processing housing 1 and extends to the bottom of the hazardous waste sludge dewatering mechanism 5 of the corresponding dewatering and pressing mechanism 21. The hazardous waste sludge dewatering mechanism 5 includes a filter frame 51. In this embodiment, the filter frame 51 is a rectangular frame with filter holes evenly distributed at its bottom to drain water from the hazardous waste sludge. The outer side of the rectangular frame is hollow. A sealing plate 52 is connected to the outer side of the filter frame 51 via an elastic rotating shaft. In this embodiment, the sealing plate 52 is connected to the filter frame 51 via a rotating shaft and torsion spring. The filter frame 51 is equipped with an opening and closing drive component. When the telescopic drive component drives the top rod 8 to descend to a preset position, the corresponding rotating arm 4 swings downward and tilts the filter frame 51. Then, the opening and closing drive component opens the sealing plate 52, allowing the hazardous waste sludge in the filter frame 51 to fall onto the conveyor 17. This method achieves automatic unloading of the dewatered hazardous waste sludge. Compared with existing methods such as using electric mechanical grippers, this method can efficiently remove the hazardous waste sludge from the filter frame 51, reducing the impact of residual hazardous waste sludge in the filter frame 51 on continuous hazardous waste sludge pretreatment operations, and preventing it from easily scattering to the outside.

[0020] Please see the appendix Figure 3-7 Preferably, in this embodiment, the support frame 6 is connected to the water receiving seat 15 via the bracket 11. The water receiving seat 15 is movably sleeved on the outer wall of the output end of the rotating device 2 and located below the support frame 3. The water receiving seat 15 is fixed to the inner wall of the processing housing 1, so that the support frame 6 will not rotate with the support frame 3. In this embodiment, the water receiving seat 15 has a circular cross-section and an annular groove on its top for receiving water. In this embodiment, the water receiving seat 15 is also connected to a drain pipe that penetrates the processing housing 1 so as to drain the water in the water receiving seat 15. The telescopic drive includes a movable frame 9 connected to the bottom end of the top rod 8 and movably sleeved on the output end of the rotating device 2. The movable frame 9 can move axially along the output end of the rotating device 2. The movable frame 9 is connected to the bracket 11 through the telescopic device 10 (such as an electric telescopic rod). The bottom of the movable frame 9 is provided with a vibration generating part, which is used to make the filter frame 51 vibrate after the filter frame 51 is tilted. During unloading, by opening the telescopic device 10, the movable frame 9 is driven, and the movable frame 9 drives the top rod 8 downward, which causes the corresponding rotating arm 4 and the hazardous waste sludge dewatering mechanism 5 to rotate downward to an inclined position.

[0021] Please see the appendix Figure 2-6Preferably, in this embodiment, the vibration generating unit includes a vibration device 12 mounted on the movable frame 9 for driving it to vibrate, and a detection sensor 13 mounted on the water receiving base 15 for detecting the position of the movable frame 9. When the detection sensor 13 detects that the telescopic device 10 has driven the movable frame 9 to a preset position, it controls the vibration device 12 to operate. In this embodiment, all electrical devices are electrically connected to an external controller. The vibration device 12 is widely used in the art and will not be described in detail here. The detection sensor 13 can be a position detection sensor. Specifically, when the telescopic device 10 is opened... When the movable frame 9 moves downwards, and the movable frame 9 moves the top rod 8 downwards to the target position set by the detection sensor 13, the detection sensor 13 sends a signal to the controller. The controller controls the vibration device 12 to work, and then the vibration device 12 drives the movable frame 9 to vibrate the top rod 8. The top rod 8 transmits the vibration to the filter frame 51, so that the hazardous waste sludge in the filter frame 51 can better detach from the filter frame 51 and fall onto the conveyor 17. This effectively promotes the sliding and emptying of hazardous waste sludge, effectively prevents the problem of hazardous waste sludge residue and incomplete unloading, and ensures efficient and continuous operation while effectively avoiding material loss and environmental pollution.

[0022] Please see the appendix Figure 6-7 Preferably, the opening and closing drive component of this embodiment includes a counterweight 54 slidably disposed on the side wall of the filter frame 51 and facing one end of the rotating arm 4. In this embodiment, both side walls of the filter frame 51 are provided with sliding grooves, which extend along the length of the filter frame 51. There are two sets of counterweights 54, and the two sets of counterweights 54 are slidably connected by sliders and sliding grooves respectively. The weight of the counterweights 54 is selected according to the actual situation, which will not be described in detail here. One end of the pull rope 53 is connected to the counterweight 54, and the other end of the pull rope 53 passes around the guide roller structure disposed at the bottom of the filter frame 51 and is connected to the sealing plate 52. In this embodiment, the guide roller structure may optionally include a bracket and a roller body rotatably disposed in the bracket. The guide roller structure is specifically disposed at the bottom of the filter frame 51 and facing one end of the rotating arm 4 and located outside the counterweight 54. After the filter frame 51 tilts, the counterweight 54 slides away from the rotating arm 4 under its own weight, thereby pulling the sealing plate 52 to flip open via the pull rope 53. The outer wall of the filter frame 51 is also provided with an elastic element 55 for driving the counterweight 54 to reset when the filter frame 51 is reset. In this embodiment, the elastic element 55 is a tension spring, one end of which is connected to the counterweight 54, and the other end is fixed to the outer wall of the filter frame 51 via a mounting seat. When the filter frame 51 returns to the horizontal position, the tension spring pulls the counterweight 54 to move and reset. The counterweight 54 is also connected to a scraper 56, which is located inside the filter frame 51 and faces the rotating arm 4. After the filter frame 51 tilts, not only does the counterweight 54 slide to a lower position, but it also drives the scraper 56 to move, thereby scraping the dewatered hazardous waste sludge inside the filter frame 51 from the side of the sealing plate 52 of the filter frame 51, so that the dewatered hazardous waste sludge falls onto the conveyor 17.

[0023] Please see the appendix Figure 2-6 Preferably, the inner wall of the treatment housing 1 in this embodiment, located above the hazardous waste sludge dewatering mechanism 5, is also provided with an injection component for injecting anti-sticking liquid (such as coagulant or flocculant) and a cleaning component for injecting cleaning liquid. The injection component and the cleaning component are respectively located on both sides of the treatment housing 1 and correspond to one hazardous waste sludge dewatering mechanism 5. It should be noted that if there are four sets of hazardous waste sludge dewatering mechanisms 5, the injection component, the cleaning component, the feeding component 16 and the dewatering and covering mechanism 21 each correspond to one set of hazardous waste sludge dewatering mechanisms 5. The working sequence is as follows: the hazardous waste sludge dewatering mechanism 5 first feeds through the feeding component 16 and then rotates with the support frame 3 to the bottom of the injection component. Liquid is injected through the injection component. After liquid injection, it rotates with the support frame 3 to the bottom of the dewatering and covering mechanism 21. After being covered and dewatered by the dewatering and covering mechanism 21, the material is unloaded. After unloading, it continues to rotate with the support frame 3 to the bottom of the cleaning component. The cleaning component cleans the filter frame 51. Both the liquid injection component and the cleaning component are located between the feeding component 16 and the dehydration and pressing mechanism 21. The liquid injection component and the cleaning component have the same structure. The following uses the structure of the liquid injection component as an example. The structure of the cleaning component will not be described in detail. The liquid injection component includes a diversion seat 18 fixed to the inner wall of the processing housing 1. One end of the diversion seat 18 is connected to an inlet pipe 20, which is connected to an external liquid supply device (such as a pump body and a storage tank). The diversion seat 18 is connected to a nozzle 19 for injecting anti-sticking liquid into the corresponding hazardous waste sludge dewatering mechanism 5. By adding an anti-sticking liquid to the hazardous waste sludge before pressing and dewatering using the injection device, the dewatering efficiency is greatly improved, and the hazardous waste sludge is effectively detached from the filter frame 51, improving the detachability of the hazardous waste sludge. The filter frame 51 is then cleaned using the cleaning device, which effectively prevents the filter frame 51 from becoming clogged and affecting the continuous hazardous waste sludge dewatering operation.

[0024] Example 2

[0025] Please see the appendix Figure 3 and 8-9. Based on Example 1, the dewatering and pressing mechanism 21 of this embodiment includes a telescopic device 211 (such as an electric telescopic rod) mounted on the inner wall of the processing housing 1 via a bracket, and a pressing block 212 located at the output end of the telescopic device 211 for entering the hazardous waste sludge dewatering mechanism 5. After the pressing block 212 enters the hazardous waste sludge dewatering mechanism 5, one side of it is in contact with the outer side of the scraper 56 and will not be interfered with by the scraper 56. The height of the pressing block 212 is greater than the height of the inner cavity of the hazardous waste sludge dewatering mechanism 5, so that the structure installed on the pressing block 212 will not enter the hazardous waste sludge dewatering mechanism 5. Both sides of the pressing block 212 are rotatably equipped with winding rollers 213. The winding rollers 213 are mounted on both sides of the pressing block 212 via brackets and shafts. The winding rollers 213 do not enter the hazardous waste sludge dewatering mechanism 5. The shaft of the winding rollers 213 is provided with a driving mechanism. The rotating device 214 (such as a micro servo motor) has an anti-adhesion cloth 215 covering the bottom of the outer wall of the pressure block 212. The two ends of the anti-adhesion cloth 215 are respectively wound around the outer wall of the two winding rollers 213. The vertical cross section of the anti-adhesion cloth 215 is U-shaped. In this embodiment, the anti-adhesion cloth 215 can be made of polytetrafluoroethylene coated fabric or silicone glass fiber cloth. The pressure block 212 is driven to press down for dewatering by the telescopic device 211, and the anti-adhesion cloth 215 is used to effectively prevent the adhesion of hazardous waste sludge. After dewatering, the winding rollers 213 are rotated synchronously by the rotating device 214 (one winding roller 213 unwinds the anti-adhesion cloth 215, and the other winding roller 213 rewinds the anti-adhesion cloth 215) to renew the section of the anti-adhesion cloth 215 in contact with the hazardous waste sludge, thereby achieving self-cleaning of the surface of the anti-adhesion cloth 215 and ensuring continuous and efficient dewatering operation and equipment operation stability.

[0026] Please refer to the attached diagram. Figure 4 and 9 -10, Preferably, the output end of the telescopic device 211 in this embodiment is provided with a connecting plate 218. The connecting plate 218 is slidably connected to the guide rail 219 provided on the pressure block 212 via a slider, so that the pressure block 212 can move horizontally relative to the connecting plate 218. The slider and the inner wall of one side of the guide rail 219 are connected by an elastic element 2. In this embodiment, the elastic element 2 is a spring. The top of the side of the pressure block 212 facing the inner wall of the processing housing 1 is provided with a guide frame 217. The vertical section of the guide frame 217 is trapezoidal, and it is sleeved on the outside of a winding roller 213. The side of the frame 217 away from the pressure block 212 is provided with an inclined edge, the top of which is located inside the bottom end. The inner wall of the treatment housing 1 is provided with a push rod 216 that cooperates with the inclined edge. After the pressure block 212 is disengaged from the hazardous waste sludge dewatering mechanism 5, the push rod 216 contacts the inclined edge to drive the pressure block 212 to move towards the support frame 3. The push rod 216 is set horizontally and can be connected to the inner wall of the treatment housing 1 by bolts. The bottom of the guide frame 217 is provided with a scraper 222, one end of which contacts the outer wall of the anti-stick cloth 215. After the telescopic device 211 drives the pressing block 212 upward to detach from the hazardous waste sludge dewatering mechanism 5, the top rod 216 first contacts the top edge of the inclined side of the pressing block 212. As the telescopic device 211 continues to lift the pressing block 212, under the guidance of the top rod 216 and the inclined side, the pressing block 212 moves horizontally relative to the telescopic device 211 towards the support frame 3 to a predetermined position, thereby ensuring that the subsequently scraped hazardous waste sludge can accurately fall into the corresponding filter frame 51 below. Then, the rotation is started. The rotating device 214 synchronously drives the two side winding rollers 213 to rotate and update the surface of the anti-stick cloth 215. At the same time, the scraper 222 fixed on the pressing block 212 scrapes off the residual hazardous waste sludge adhering to the outer wall of the anti-stick cloth 215, causing it to fall into the corresponding filter frame 51. This effectively solves the problem of material waste caused by the adhesion of hazardous waste sludge during the pressing and dewatering process of the pressing block 212, realizes the accurate recycling of hazardous waste sludge and the self-cleaning of the anti-stick cloth 215, and improves the dewatering efficiency and material utilization rate of hazardous waste sludge.

[0027] Preferably, in this embodiment, the inner cavity of the pressure block 212 is movably provided with a movable plate 223. The movable plate 223 is connected to the inner wall of the pressure block 212 through an elastic element (such as a spring). The movable plate 223 is provided with a plurality of impact blocks 224 for contacting the bottom inner wall of the pressure block 212. The impact blocks 224 can be made of metal material, but are not limited to this type. The movable plate 223 is provided with a permanent magnet wheel 220 rotatably via a wheel frame and a rotating shaft. The permanent magnet wheel 220 is made of permanent magnet material. The inner cavity of the pressure block 212 above the permanent magnet wheel 220 is provided with a rotating roller 221 rotatably via a rotating shaft. The outer wall of the rotating roller 221 is embedded with an arc-shaped permanent magnet block for attracting the permanent magnet wheel 220 to drive the movable plate 223 to move upward. The arc-shaped permanent magnet block and the permanent magnet wheel 220 have opposite magnetic poles. The shaft of the rotating roller 221 is connected to the output end of the rotating device 214. The two can be connected by a sprocket drive group (including sprockets and chains). When the rotating roller 221 rotates through the rotating device 214, the arc-shaped permanent magnet block periodically approaches the permanent magnet wheel 220 to generate magnetic attraction, which drives the movable plate 223 to move upward against the resistance of the elastic element 3. After the arc-shaped permanent magnet block passes the adsorption area, the movable plate 223 falls rapidly under the action of the elastic element 3, causing the impact block 224 to hit the bottom inner wall of the pressure block 212 and generate vibration, effectively shaking off the hazardous waste sludge adhering to the surface of the anti-adhesion cloth 215, significantly improving the cleanliness of the anti-adhesion cloth 215 and the desorption efficiency of the hazardous waste sludge.

[0028] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A method for pretreatment of hazardous waste sludge in industrial parks, characterized in that, Includes the following steps: S1: Add inorganic acid to hazardous waste sludge and stir the reaction at 40-80℃ for 10-60 minutes; S2: Ferrous salt and hydrogen peroxide are added sequentially to the hazardous waste sludge after treatment in step S1, and an oxidation reaction is carried out under acidic conditions; S3: Add alkaline substances to the hazardous waste sludge treated in step S2 to adjust the pH to 8-11, then add a composite stabilizer containing sulfides and phosphates, and stir to react; S4: The hazardous waste sludge treated in step S3 is fed into a hazardous waste sludge dewatering equipment for dewatering to obtain pretreated sludge cake. The hazardous waste sludge dewatering equipment includes a treatment shell (1), a rotating device (2) is provided inside the treatment shell (1), a support frame (3) is provided at the output end of the rotating device (2), a number of rotating arms (4) are connected to the elastic rotating shaft on the outer wall of the support frame (3), the rotating arms (4) are connected to the hazardous waste sludge dewatering mechanism (5), and a bearing frame (6) is rotatably provided on the outer wall of the support frame (3) and fits against the bottom of the rotating arm (4), with a corresponding rotating arm (4) on the bearing frame (6). The position is provided with an opening (7) for the rotating arm (4) to rotate into. A top rod (8) is movably provided in the opening (7). The top rod (8) is connected to a telescopic drive component that drives its lifting and lowering. A feeding component (16) and a dewatering and pressing mechanism (21) are respectively provided on both sides of the processing housing (1). The feeding component (16) and the dewatering and pressing mechanism (21) correspond to a hazardous waste sludge dewatering mechanism (5). The dewatering and pressing mechanism (21) corresponds to the opening (7).

2. The hazardous waste sludge pretreatment method according to claim 1, characterized in that, The hazardous waste sludge dewatering equipment also includes a conveyor (17), one end of which passes through the opening (14) on one side of the processing housing (1) and extends to the bottom of the hazardous waste sludge dewatering mechanism (5) of the corresponding dewatering and covering mechanism (21). The hazardous waste sludge dewatering mechanism (5) includes a filter frame (51), with a sealing plate (52) connected to the outer elastic rotating shaft of the filter frame (51). The filter frame (51) is provided with an opening and closing drive component. When the telescopic drive component drives the top rod (8) to descend to the preset position, the corresponding rotating arm (4) swings downward and drives the filter frame (51) to tilt. Then the opening and closing drive component opens the sealing plate (52), so that the hazardous waste sludge in the filter frame (51) falls onto the conveyor (17).

3. The hazardous waste sludge pretreatment method according to claim 2, characterized in that, The support frame (6) is connected to the water receiving seat (15) through the bracket (11). The water receiving seat (15) is movably sleeved on the outer wall of the output end of the rotating device (2) and located below the support frame (3). The water receiving seat (15) is fixed to the inner wall of the processing housing (1). The telescopic drive includes a movable frame (9) that connects to the bottom end of the top rod (8) and is movably sleeved on the output end of the rotating device (2). The movable frame (9) is connected to the support (11) through the telescopic device (10). The bottom of the movable frame (9) is provided with a vibration generating part, which is used to make the filter frame (51) vibrate after the filter frame (51) is tilted.

4. The hazardous waste sludge pretreatment method according to claim 3, characterized in that, The vibration generating unit includes a vibration device (12) mounted on the movable frame (9) for driving it to vibrate, and a detection sensor (13) mounted on the water receiving seat (15) for detecting the position of the movable frame (9). When the detection sensor (13) detects that the telescopic device (10) drives the movable frame (9) to move to a preset position, the vibration device (12) is controlled to work.

5. The hazardous waste sludge pretreatment method according to claim 2, characterized in that, The opening and closing drive includes a counterweight (54) slidably disposed on the side wall of the filter frame (51) and facing one end of the rotating arm (4). The counterweight (54) is connected to one end of a pull rope (53). The other end of the pull rope (53) passes around the guide roller structure disposed at the bottom of the filter frame (51) and is connected to the sealing plate (52). After the filter frame (51) is tilted, the counterweight (54) slides away from the rotating arm (4), thereby pulling the sealing plate (52) to flip open by the pull rope (53). The outer wall of the filter frame (51) is also provided with an elastic element (55) for driving the counterweight (54) to reset when the filter frame (51) is reset. The counterweight (54) is also connected to a scraper (56). The scraper (56) is disposed inside the filter frame (51) and facing one side of the rotating arm (4).

6. The hazardous waste sludge pretreatment method according to claim 1, characterized in that, The dewatering and pressing mechanism (21) includes a telescopic device two (211) located on the inner wall of the processing housing (1), and a pressing block (212) located at the output end of the telescopic device two (211) and used to enter the hazardous waste sludge dewatering mechanism (5). The height of the pressing block (212) is greater than the height of the inner cavity of the hazardous waste sludge dewatering mechanism (5). Both sides of the pressing block (212) are rotatably equipped with winding rollers (213). The shaft of the winding roller (213) is equipped with a rotating device two (214) to drive it to rotate. The bottom of the outer wall of the pressing block (212) is covered with an anti-stick cloth (215). The two ends of the anti-stick cloth (215) are respectively wound around the outer wall of the two winding rollers (213).

7. The hazardous waste sludge pretreatment method according to claim 6, characterized in that, The output end of the telescopic device 2 (211) is provided with a connecting plate (218). The connecting plate (218) is slidably connected to the guide rail (219) on the pressure block (212) via a slider. The slider and the inner wall of one side of the guide rail (219) are connected by an elastic element 2. The top of the side of the pressure block (212) facing the inner wall of the processing housing (1) is provided with a guide frame (217). The side of the guide frame (217) away from the pressure block (212) is provided with an inclined plate. The top of the inclined side is located inside its bottom end. The inner wall of the processing housing (1) is provided with a top rod (216) that cooperates with the inclined side. After the pressure block (212) is disengaged from the hazardous waste sludge dewatering mechanism (5) upward, the top rod (216) contacts the inclined side to drive the pressure block (212) to move towards the support frame (3). The bottom of the guide frame (217) is provided with a scraper (222). One end of the scraper (222) contacts the outer wall of the anti-stick cloth (215).

8. The hazardous waste sludge pretreatment method according to claim 6, characterized in that, The inner cavity of the pressure block (212) is movably provided with a movable plate (223). The movable plate (223) is connected to the inner wall of the pressure block (212) through an elastic element. The movable plate (223) is provided with several sets of impact blocks (224) for contacting the inner wall of the pressure block (212). The movable plate (223) is rotatably provided with a permanent magnet wheel (220). The inner cavity of the pressure block (212) above the permanent magnet wheel (220) is rotatably provided with a rotating roller (221). The outer wall of the rotating roller (221) is embedded with an arc-shaped permanent magnet block for attracting the permanent magnet wheel (220) to drive the movable plate (223) to move upward. The shaft of the rotating roller (221) is connected to the output end of the rotating device (214) for transmission.

9. The hazardous waste sludge pretreatment method according to claim 1, characterized in that, The inner wall of the treatment housing (1) and above the hazardous waste sludge dewatering mechanism (5) is also provided with an injection component for injecting anti-sticking liquid and a cleaning component for injecting cleaning liquid. The injection component and the cleaning component are respectively located on both sides of the treatment housing (1) and correspond to a hazardous waste sludge dewatering mechanism (5). The injection component and the cleaning component are both located between the feeding component (16) and the dewatering and pressing mechanism (21). The injection component and the cleaning component have the same structure. The injection component includes a diversion seat (18) fixed on the inner wall of the treatment housing (1). One end of the diversion seat (18) is connected to an inlet pipe (20). The diversion seat (18) is connected to a nozzle (19) for injecting anti-sticking liquid into the corresponding hazardous waste sludge dewatering mechanism (5).

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