A circulating heavy metal contaminated sludge remediation device

Abstract

The utility model relates to a sludge treatment technical field especially, and it is a kind of cyclic heavy metal pollution sludge remediation device.A kind of cyclic heavy metal pollution sludge remediation device, including processing support and discharge support, the upper end of processing support is equipped with feed tank, the inside of feed tank body is evenly arranged with electrode needle for electric repair, electrode needle is electrically connected with power supply, the lower side of the outlet of feed tank in processing support is equipped with upper conveying frame, the lower side of upper conveying frame has the lower conveying frame of staggered arrangement, lower conveying frame is conveyed to discharge outlet, and the inclined discharge pipe of discharge support is docked with discharge outlet and is installed on discharge support.The cyclic heavy metal pollution sludge remediation device contains processing support and discharge support, and the inside of feed tank on the upper end of processing support has electrified electrode needle, and the lower side of outlet has the upper and lower conveying frames of staggered arrangement, and the inclined discharge pipe of discharge support is docked with discharge outlet.Feed tank receives sludge, electrode needle removes heavy metal, conveying frame extends repair, discharge pipe leads out, realizes efficient repair and directional output.

Description

Technical Field

[0001] This utility model relates to the field of sludge treatment technology, and in particular to a circulating heavy metal contaminated sludge remediation device. Background Technology

[0002] Under the long-term influence of industrial production, mining development, and agricultural activities, heavy metals (such as lead, cadmium, mercury, and chromium) continuously enter the aquatic environment through wastewater discharge and atmospheric deposition. After physical sedimentation and bioaccumulation, they accumulate in large quantities in the bottom sediment, forming heavy metal-contaminated sludge. This type of sludge not only occupies land resources and damages the integrity of aquatic ecosystems, but the heavy metals it contains may also enter groundwater or soil through leaching and diffusion, thereby harming human health through the food chain and posing a serious threat to the ecological environment and public safety. Therefore, developing efficient and stable technologies and devices for the remediation of heavy metal-contaminated sludge has become a key research direction in the field of environmental governance.

[0003] Currently, remediation technologies for heavy metal-contaminated sludge mainly include chemical leaching, bioremediation, and electrokinetic remediation. Among these, electrokinetic remediation is widely used in practical engineering due to its advantages such as simple equipment, high remediation efficiency, and strong adaptability to low-permeability sludge. Its core principle involves inserting electrodes into the contaminated sludge and applying a DC electric field. Utilizing the electrophoresis and electromigration of heavy metal ions in the electric field, the ions move towards the corresponding electrodes and are collected and removed, thereby purifying the sludge. However, existing electrokinetic remediation devices still have many shortcomings in practical applications: Poor uniformity of remediation: Most devices have a single electrode arrangement, and sludge is prone to accumulation and compaction during treatment, resulting in uneven electric field distribution. In some areas, heavy metal ions cannot migrate effectively, causing incomplete remediation and large fluctuations in purification effect.

[0004] Moisture interferes with remediation efficiency: Contaminated sludge typically has a high water content, which dilutes the electric field strength and reduces ion migration rate. Furthermore, the high water content of the sludge makes it highly mobile and prone to segregation during transport, further affecting the remediation effect. Existing devices often lack targeted dewatering and material homogenization designs, hindering improvements in remediation efficiency.

[0005] Poor process coordination: The various stages of sludge treatment, from feeding and remediation to discharge, are mostly designed independently, lacking coordination. For example, the remediated sludge often experiences discharge blockage due to its high water content and viscosity, and secondary accumulation is prone to occur during transportation, resulting in some sludge not being able to fully receive the electric field effect, making it difficult to achieve continuous and large-scale remediation.

[0006] Low equipment integration: In existing technologies, functions such as electric repair, dehydration, and conveying are mostly completed by independent equipment, which not only occupies a large area and has high equipment investment costs, but also requires additional adaptation and debugging between equipment. The operation is complicated and the energy consumption is high, which is not conducive to industrialization and promotion.

[0007] In view of the above-mentioned shortcomings, the designer has actively researched and innovated in order to create a cyclic heavy metal contaminated sludge remediation device, making it more industrially valuable. Utility Model Content

[0008] To address the aforementioned technical problems, the purpose of this utility model is to provide a circulating heavy metal contaminated sludge remediation device.

[0009] This utility model discloses a circulating heavy metal contaminated sludge remediation device, including a treatment support and a discharge support. A feed box is installed at the upper end of the treatment support. Electrode needles for electric remediation are evenly arranged on the inner side of the feed box. The electrode needles are electrically connected to a power source. An upper conveyor frame is installed inside the treatment support below the outlet of the feed box. A lower conveyor frame is staggered below the upper conveyor frame. The lower conveyor frame transports the sludge to the discharge port. An inclined discharge pipe installed on the discharge support is connected to the discharge port.

[0010] This circulating heavy metal contaminated sludge remediation device includes a treatment support and a discharge support. A feed box is installed at the top of the treatment support, and electrode needles electrically connected to a power source are evenly arranged inside the feed box. An upper conveyor frame is installed below the outlet of the feed box inside the treatment support, and a staggered lower conveyor frame is installed below the upper conveyor frame. The lower conveyor frame transports the sludge to the discharge port. An inclined discharge pipe on the discharge support is connected to the discharge port. The feed box receives the sludge to be remediated, and the electrode needles remove heavy metals from the sludge through electric remediation technology. The staggered arrangement of the upper and lower conveyor frames enables orderly transport of sludge and extends the remediation process. The inclined discharge pipe discharges the remediated sludge, thus completing the efficient remediation and directional output of heavy metal contaminated sludge.

[0011] Furthermore, an electric heater is installed on the other side of the feed box on the processing support. The side of the electric heater facing the upper and lower conveyor frames is open. The heated air is blown onto the upper and lower conveyor frames to heat and remove water from the sludge.

[0012] An electric heater is installed on the other side of the feed box on the processing support. The side of the electric heater facing the upper and lower conveyor frames is open. When working, the hot air generated by the electric heater is blown through the opening onto the sludge on the upper and lower conveyor frames. The hot air generated by the electric heater is blown in a direction onto the sludge being conveyed, and the sludge is heated by heat transfer, which accelerates the evaporation and removal of moisture in the sludge, reduces the moisture content of the sludge, provides a suitable material state for the subsequent remediation process, and also reduces the volume of the sludge after remediation, which facilitates subsequent transportation and disposal, and improves the processing efficiency and practicality of the entire remediation device.

[0013] Furthermore, a blower is installed below the heater, and a guide channel for air inflow is opened at the bottom of the heater, through which the blower blows air into the heater.

[0014] A blower is installed below the electric heater, and a guide channel for air inflow is opened at the bottom of the electric heater. When working, the blower is activated and generates airflow, which flows precisely into the electric heater through the guide channel. The blower continuously supplies sufficient air to the electric heater. After being heated by the electric heater, the air forms a hot airflow, which provides a stable airflow source for blowing hot air onto the sludge on the conveyor frame. This ensures that the supply of hot air is sufficient and the flow rate is controllable, thereby ensuring that the heating and dewatering effect on the sludge is uniform and efficient. It also avoids incomplete dewatering due to insufficient hot air, and improves the overall water removal efficiency and stability of the device.

[0015] Furthermore, a spiral discharge rod is installed inside the inclined discharge pipe, and a discharge motor is fixed at the tail end of the inclined discharge pipe. The discharge motor drives the discharge rod to rotate, and an opening is provided on the lower side of the top of the inclined discharge pipe for discharging the treated sludge.

[0016] The inclined discharge pipe has a spiral discharge rod inside, with a discharge motor fixedly installed at its tail end. During operation, the discharge motor starts and drives the discharge rod to rotate. At the same time, an opening for discharge is opened on the lower side of the top of the inclined discharge pipe. Driven by the discharge motor, the spiral discharge rod rotates, and the propulsive action of the spiral structure steadily conveys the processed sludge that enters the inclined discharge pipe from the discharge port forward until it is discharged from the opening on the lower side of the top. This design can prevent sludge from accumulating and clogging in the inclined pipe, and realize the directional, continuous and smooth discharge of the repaired sludge. It adapts to the continuous processing requirements of the device and improves the overall discharge efficiency and stability.

[0017] Furthermore, stirring rods are movably installed inside the feed box via shafts and bearings. One of the stirring rods extends out of the feed box and is fixedly connected to the stirring motor. The stirring motor is installed on one side of the feed box via a connecting frame. The other ends of the two stirring rods extend out of the feed box and are connected by a sprocket and a chain for transmission.

[0018] Inside the feed box, stirring rollers are movably installed via shafts and bearings. The tail end of one stirring roller extends out of the feed box and is fixedly connected to the stirring motor. The stirring motor is mounted on one side of the feed box via a connecting bracket. The other ends of the two stirring rollers extend out of the feed box and are connected to the chain via sprockets. After the stirring motor starts, it drives the connected stirring rollers to rotate. Through the transmission action of the sprockets and chain, the two stirring rollers rotate synchronously, which fully stirs the heavy metal contaminated sludge in the feed box. This not only breaks up sludge clumps and distributes the sludge evenly, ensuring that the electric repair action of the subsequent electrode needles can cover every part of the sludge and improve the repair effect, but also pushes the sludge smoothly from the feed box outlet into the conveyor frame, avoiding sludge accumulation and blockage in the box, and ensuring the continuity of the device's feeding and repair process.

[0019] Furthermore, stirring rods are evenly distributed on the surface of each stirring rod.

[0020] Each stirring rod has evenly distributed stirring bars on its surface. When the stirring motor drives the stirring rod to rotate, the evenly arranged stirring bars greatly increase the contact area with the sludge in the feed box, enhancing the stirring and dispersing effect on the sludge. This can more efficiently break up sludge clumps, making the sludge form a more uniform and loose state. This ensures that the current released by the electrode needle can be evenly applied to each part of the sludge, improving the removal efficiency of heavy metals by electric remediation. At the same time, the stirring action of the stirring rods can further push the sludge towards the feed box outlet, avoiding local accumulation and ensuring a smooth connection between the feeding and remediation processes.

[0021] Furthermore, a rotating roller is movably mounted on the processing bracket below the feed box via a shaft. The tail end of the rotating roller is fixedly connected to a rotating motor, which is mounted on the side wall of the processing bracket. An extrusion roller is movably mounted on the processing bracket on one side of the rotating roller via a shaft and bearing.

[0022] On the processing support below the feed box, a rotating roller is movably mounted via a shaft. The tail end of the rotating roller is fixedly connected to a rotating motor mounted on the side wall of the processing support. On the processing support on one side of the rotating roller, a squeezing roller is movably mounted via a shaft and bearing. After the rotating motor starts, it drives the rotating roller to rotate, forming a squeezing structure with the squeezing roller on one side. When the sludge discharged from the feed box passes between the two, the relative action of the rotating roller and the squeezing roller squeezes and dewaters the sludge, further reducing the sludge moisture content. This reduces the load on the subsequent electrothermal dewatering and electric repair processes. At the same time, the squeezing action can compact the sludge to form a uniform thin layer, increasing the contact area with hot air and electrode needles, improving the dewatering and repair efficiency. It can also remove some impurities from the sludge through squeezing, optimizing the sludge treatment state.

[0023] Furthermore, there is a gap of 1-4 cm between the rotating roller and the extrusion roller.

[0024] A gap of 1-4cm is reserved between the rotating roller and the extrusion roller; its function is to provide suitable space for the sludge to pass through, so as to avoid the sludge getting stuck and blocked due to the gap being too small, ensuring smooth feeding and conveying process, and to prevent the gap from weakening the extrusion effect due to the gap being too large. The extrusion force on the sludge can be precisely controlled by this gap size. While effectively squeezing out excess water from the sludge and reducing the moisture content, the sludge is compacted into a thin layer of uniform thickness. This creates favorable conditions for sufficient contact of hot air during subsequent electrothermal dehydration and efficient action of electrode needles during electric repair. Moreover, the gap can be flexibly adapted according to the initial humidity and viscosity of the sludge to ensure the extrusion treatment effect of sludge in different states and improve the adaptability and processing stability of the device.

[0025] By means of the above-described solution, the present invention has at least the following advantages: To improve the uniformity and thoroughness of electric remediation and ensure purification effectiveness: The device is equipped with dual stirring rollers and evenly distributed stirring rods inside the feed hopper. Driven synchronously by a stirring motor, these rollers efficiently break down sludge clumps, resulting in a loose and uniform sludge state. Simultaneously, evenly arranged electrode needles inside the feed hopper create a uniform electric field. Combined with the loose sludge shape, this ensures the electric field fully covers every part of the sludge, avoiding remediation blind spots caused by sludge accumulation and compaction. Furthermore, rotating and pressing rollers compact the sludge into a uniform thin layer, further increasing the contact area between the sludge and the electric field, significantly improving the migration efficiency of heavy metal ions. This effectively solves the problems of incomplete remediation and large fluctuations in purification effect found in existing devices.

[0026] To enhance moisture removal and reduce its interference with remediation, the device employs a dual dehydration system combining "extrusion dehydration" and "electrothermal dehydration." Rotating rollers and extrusion rollers below the feed hopper pre-extract the sludge through a precise 1-4cm gap, rapidly removing a large amount of free water. Subsequently, an electric heater, supplied by a blower, generates a stable hot airflow that is directed towards the sludge during transport, accelerating the evaporation of residual moisture. This dual dehydration design effectively reduces the sludge's moisture content, avoiding the problems of high moisture content diluting the electric field strength and slowing ion migration. It also reduces sludge fluidity, preventing segregation during transport and providing a suitable material state for electrokinetic remediation, significantly improving remediation efficiency.

[0027] Achieving seamless integration of processing steps to ensure continuous operation: The device achieves full-process coordination through multi-structure linkage, encompassing "feeding and equalization—extrusion dehydration—electrical dehydration—electric repair—conveyor discharge." The stirring rollers and rods smoothly propel the sludge into the extrusion structure. The staggered upper and lower conveyor frames extend the repair path while ensuring orderly sludge transport. The spiral discharge rod within the inclined discharge pipe, driven by the discharge motor, effectively prevents blockage of the repaired sludge due to its high viscosity, achieving directional and continuous discharge. Seamless integration of each stage completely solves the problems of independent processes and secondary accumulation in existing devices, meeting the needs of large-scale continuous repair.

[0028] Improving equipment integration and reducing application costs and operational complexity: The device integrates functions such as electric repair, mixing and homogenizing, extrusion dehydration, electrothermal dehydration, and conveying discharge into a single structure consisting of a processing support and a discharge support. This eliminates the need for separate equipment, significantly reducing floor space and equipment investment costs. Simultaneously, the various structures are automated through motor drives, with the mixing motor, rotation motor, and discharge motor working collaboratively. This reduces manual intervention, lowers operational complexity and energy consumption, and solves the problems of difficult compatibility and complex operation associated with existing technologies, making it more suitable for industrial application.

[0029] Enhancing the adaptability and operational stability of the device and improving its practical value: The adjustable gap of 1-4cm between the rotating roller and the extrusion roller can be flexibly adapted according to the initial moisture and viscosity of the sludge, ensuring the extrusion treatment effect of sludge in different states; the blower provides a stable airflow to the electric heater, ensuring sufficient hot air supply and controllable flow rate, avoiding uneven water removal; the spiral discharge rod effectively prevents pipe blockage and ensures smooth discharge. The precise design and flexible adaptability of the multi-structure significantly improve the device's adaptability to different working conditions, reduce equipment failure rate, extend service life, and provide stable and reliable equipment support for the efficient remediation of heavy metal contaminated sludge.

[0030] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show a certain embodiment of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the discharge pipe and the discharge rod inside the discharge pipe of this utility model; Figure 3 This is a schematic diagram of the upper structure of the feed box of this utility model; Figure 4 This is a schematic diagram of the assembly structure of the rotating roller and the extrusion roller on the lower side of the feed box of this utility model; In the diagram: 1. Processing support; 2. Discharge support; 3. Feed box; 4. Electrode needle; 5. Upper conveyor frame; 6. Lower conveyor frame; 7. Discharge port; 8. Discharge pipe; 9. Heater; 10. Blower; 11. Discharge rod; 12. Discharge motor; 13. Stirring roller; 14. Stirring motor; 15. Stirring rod; 16. Rotating roller; 17. Rotating motor; 18. Extrusion roller. Detailed Implementation

[0033] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0034] See Figure 1 The working process of this circulating heavy metal contaminated sludge remediation device is as follows: The operator sends the heavy metal contaminated sludge to be remediated into the feed box 3 at the upper end of the treatment support 1 through an external conveying pump. The electrode needles 4, which are evenly arranged inside the feed box 3 and electrically connected to the power supply, are activated. The heavy metals in the sludge are removed through electric remediation technology. The pre-treated sludge is discharged from the outlet of the feed box 3 and falls into the upper conveyor frame 5 below. The upper conveyor frame 5 transports the sludge to the lower conveyor frame 6, which is set in a staggered position. The lower conveyor frame 6 continues to transport the sludge and allows it to undergo further remediation during the process. Finally, the remediated sludge is transported to the lower conveyor frame 6. The sludge is transported to the discharge port 7. The inclined discharge pipe 8 on the discharge support 2 is connected to the discharge port 7 to discharge the treated sludge. The uniform electrode needles 4 in the feed box 3 can ensure the uniform distribution of the electric field and improve the comprehensiveness of heavy metal removal. The staggered design of the upper conveyor frame 5 and the lower conveyor frame 6 extends the sludge transport and repair path, making the repair more complete. The inclined discharge pipe 8 realizes the directional discharge of the repaired sludge. The overall structure realizes the orderly connection of sludge from feeding, repair to discharge, avoiding the problem of incomplete repair caused by manual intervention, and greatly improving the repair efficiency and effect of heavy metal contaminated sludge.

[0035] When the sludge is conveyed on the upper conveyor frame 5 and the lower conveyor frame 6, the electric heater 9, installed on the processing support 1 and located on the other side of the feed box 3, starts and generates heat. Since the side of the electric heater 9 facing the upper conveyor frame 5 and the lower conveyor frame 6 is open, the heated air is blown directly onto the sludge on the upper conveyor frame 5 and the lower conveyor frame 6 through the opening. The sludge is heated through heat transfer, which accelerates the evaporation and removal of water in the sludge. The open design allows the hot air to act precisely on the sludge during conveying, achieving targeted heating and water removal, effectively reducing the water content of the sludge, avoiding the dilution of the electric field strength by high water content, slowing down the migration of heavy metal ions, and creating suitable conditions for the electric repair process. At the same time, the removal of water reduces the volume of sludge, making it easier for subsequent conveying and disposal. The direct blowing of hot air can improve the water removal efficiency. Combined with the conveying action of the conveyor frame, water removal can be achieved while conveying, without affecting the overall processing flow, further improving the practicality and repair efficiency of the device.

[0036] When it is necessary to heat and dehydrate the sludge on the conveyor frame, the blower 10 installed below the heater 9 is activated. The airflow generated by the blower 10 flows precisely into the heater 9 through the guide groove at the bottom of the heater 9. After being heated by the heater 9, the airflow becomes hot air, which is then blown towards the opening of the heater 9 onto the sludge on the upper conveyor frame 5 and the lower conveyor frame 6. The combination of the blower 10 and the guide groove provides a stable and sufficient air source for the heater 9, ensuring that hot air is continuously generated and supplied in sufficient quantities, avoiding incomplete dehydration due to insufficient hot air. At the same time, the guide groove can guide the airflow precisely into the heater 9, reducing airflow loss and improving heat utilization efficiency. Furthermore, the blowing intensity of the hot air can be controlled by adjusting the wind speed of the blower 10 to adapt to the dehydration needs of sludge with different moisture contents, ensuring uniform and efficient dehydration, and further laying a good foundation for the subsequent electric repair process.

[0037] See Figure 2 After the repaired sludge is conveyed to the discharge port 7 via the lower conveyor frame 6 and enters the inclined discharge pipe 8, the discharge motor 12 fixed at the tail end of the inclined discharge pipe 8 is started. The discharge motor 12 drives the spiral discharge rod 11 inside the inclined discharge pipe 8 to rotate synchronously. The spiral discharge rod 11 generates propulsion force during rotation, which conveys the sludge upward along the inclined discharge pipe 8 until the sludge is discharged from the opening on the lower side of the top of the inclined discharge pipe 8. The rotation and pushing of the spiral discharge rod 11 can effectively solve the problem that the repaired sludge is prone to accumulation and blockage in the inclined pipe due to its high water content and high viscosity, thus realizing the continuous and smooth conveying of sludge. The drive method of the discharge motor 12 can flexibly control the discharge speed to match the overall processing rhythm of the device. The opening design on the lower side of the top of the inclined discharge pipe 8 can realize the directional discharge of sludge, which is convenient for subsequent collection or transfer. The overall structure ensures the stability and efficiency of the discharge process and meets the needs of continuous repair of the device.

[0038] See Figure 3When the heavy metal contaminated sludge to be repaired is fed into the feed box 3, the stirring motor 14, which is installed on one side of the feed box 3 via a connecting frame, is started. The stirring motor 14 drives a stirring rod 13, which is fixedly connected to it, to rotate inside the feed box 3 via a shaft and bearings. Since the other ends of the two stirring rods 13 extend out of the feed box 3 and are connected by a sprocket and chain drive, the other stirring rod 13 rotates synchronously with the active stirring rod. The two stirring rods work together to agitate the sludge in the feed box 3. The advantage of this is that the stirring motor 14 drives the... The sprocket and chain drive enables the two stirring rollers 13 to operate synchronously, which can efficiently break up sludge clumps, distribute the sludge evenly, avoid local accumulation, and ensure that the electrode needles 4 inside the feed box 3 can form a uniform electric field and act on each part of the sludge, improving the comprehensiveness and thoroughness of electric repair. At the same time, the stirring action can push the sludge smoothly from the outlet of the feed box 3 into the next stage of processing structure, preventing blockage inside the box and ensuring the continuity of the repair process. Moreover, the sprocket and chain drive has the characteristics of accurate transmission ratio and stable operation, reducing power loss and extending the service life of components.

[0039] When the stirring motor 14 starts and drives the two stirring rollers 13 to rotate synchronously through the sprocket and chain drive, the stirring rods 15 evenly arranged on the surface of each stirring roller 13 rotate together with the stirring roller 13. The stirring rods 15 penetrate into the sludge in the feed box 3, repeatedly stirring and breaking up the clumps of sludge. At the same time, they push the sludge to be evenly distributed in the feed box 3 and move towards the outlet. The evenly arranged stirring rods 15 greatly increase the contact area with the sludge. Compared with the simple stirring rollers 13, they can break up the sludge clumps more efficiently, making the sludge form a looser and more uniform state. This ensures that the electric field released by the electrode needles 4 inside the feed box 3 can fully cover every part of the sludge, avoiding repair blind spots caused by sludge accumulation. This significantly improves the removal efficiency of heavy metals by electric repair. At the same time, the stirring action of the stirring rods 15 can enhance the pushing effect on the sludge, effectively preventing the sludge from accumulating and blocking in the feed box 3, ensuring a smooth connection between feeding and subsequent repair processes, and further improving the processing stability of the device.

[0040] See Figure 4After the sludge treated by the agitation in the feed box 3 is discharged, it falls between the rotating roller 16 and the extrusion roller 18 on the processing support 1 below the feed box 3. The rotating motor 17 installed on the side wall of the processing support 1 is started. The rotating motor 17 drives the rotating roller 16, which is movably installed through the shaft, to rotate. The rotating roller 16 interacts with the extrusion roller 18, which is movably installed on one side through the shaft and bearing, to extrude the sludge. The rotating roller 16 driven by the rotating motor 17, together with the extrusion roller 18, can effectively squeeze out excess water from the sludge, reduce the water content to avoid diluting the electric field strength and affecting the migration of heavy metal ions, and reduce the load on subsequent electric repair and heating dehydration. At the same time, the extrusion can compact the sludge into a uniform thin layer, increase the contact area with the electrode needle 4 and hot air, improve the repair and dehydration efficiency, and remove some impurities to optimize the state of the sludge. The movable installation method of the rotating roller 16 and the extrusion roller 18 ensures flexible operation, ensures a stable and smooth extrusion process, and does not hinder the sludge conveying rhythm.

[0041] When the rotating motor 17 drives the rotating roller 16 to rotate, and cooperates with the extrusion roller 18 on one side to process the sludge discharged from the feed box 3, the 1-4cm gap reserved between the rotating roller 16 and the extrusion roller 18 provides a suitable channel for the sludge to pass through. The sludge enters the gap under the drive of the rotating roller 16, and after the extrusion process is completed under the relative action of the two, it continues to be transported to the next stage structure. The 1-4cm gap size can accurately control the extrusion force and the sludge passage efficiency, which not only avoids the sludge from getting stuck and blocked due to the gap being too small, ensuring the continuity of the feeding and conveying process, but also prevents the gap from being too large, which weakens the dewatering effect. It can effectively squeeze out excess water from the sludge to reduce the moisture content, and at the same time compact the sludge into a uniform thin layer of suitable thickness, creating conditions for the full contact of the hot air of the electric heater 9 and the uniform electric field of the electrode needle 4. Moreover, the gap can be flexibly adjusted according to the initial humidity and viscosity of the sludge to adapt to the processing needs of sludge in different states, improve the adaptability and processing stability of the device, and reduce equipment failure or reduced repair efficiency caused by improper extrusion.

[0042] The gap between the extrusion roller 18 and the rotating roller 16 is adjusted by bolting it to the corresponding through hole on the processing bracket 1.

[0043] The working principle of this utility model is as follows: Preliminary preparation stage: First, check the status of each component of the device, ensuring that the processing support 1 and the discharge support 2 are stable, the electrode needle 4 is properly connected to the power supply, and that rotating parts such as the stirring roller 13, rotating roller 16, and extrusion roller 18 operate flexibly. The 1-4cm gap between the rotating roller 16 and the extrusion roller 18 is adjusted to a suitable size using bolts according to the initial moisture and viscosity of the sludge. Then, connect the main power supply of the device and confirm that the stirring motor 14, rotating motor 17, discharge motor 12, heater 9, and blower 10 can all start normally.

[0044] Feeding and pre-mixing stage: The operator uses an external conveying pump to feed the heavy metal contaminated sludge to be repaired into the feed box 3 at the upper end of the treatment support 1, and at the same time starts the mixing motor 14. The mixing motor 14 drives one mixing rod 13 fixedly connected to it to rotate. Through the transmission action of the sprocket and chain, the other mixing rod 13 rotates synchronously. The mixing rods 15 evenly distributed on the surface of the two mixing rods 13 penetrate into the sludge, effectively breaking up the clumps and making the sludge into a loose and uniform state. At the same time, it pushes the sludge towards the outlet of the feed box 3 to avoid local accumulation.

[0045] Dewatering and compression stage: The stirred sludge is discharged from the outlet of the feed box 3 and falls between the rotating roller 16 and the compression roller 18 on the lower processing support 1. The rotating motor 17 is started, driving the rotating roller 16 to rotate, forming a relative interaction with the compression roller 18 on one side, and compressing the sludge through the precise gap between the two. This process not only squeezes out a large amount of free water, reducing the moisture content of the sludge, but also compacts the sludge into a uniform thin layer, while removing some impurities, laying the foundation for subsequent processing.

[0046] Conveying and electrothermal dehydration stage: The compressed sludge thin layer is conveyed to the upper conveyor frame 5, which then transfers it to the staggered lower conveyor frame 6. At this time, the electric heater 9 and the blower 10 are activated. The airflow generated by the blower 10 flows into the interior of the electric heater 9 through the bottom guide groove. After being heated, it forms hot air, which is blown onto the sludge on the upper and lower conveyor frames through the openings of the electric heater 9, accelerating the evaporation of residual moisture and further reducing the moisture content. The hot air blowing does not affect the sludge conveying rhythm.

[0047] Electro-remediation stage: During the mixing of sludge in the feed box 3 and its subsequent conveying on the upper and lower conveyor frames, the electrode needles 4, evenly arranged inside the feed box 3, are always energized, forming a uniform electric field. The loose, uniform, and thin-layered sludge can fully contact the electric field. Under the action of the electric field, heavy metal ions move to the corresponding electrodes through electrophoresis and electromigration and are collected and removed. The staggered upper and lower conveyor frames extend the remediation path, ensuring thorough remediation.

[0048] Discharge stage: The repaired sludge is conveyed to the discharge port 7 via the lower conveyor frame 6 and enters the inclined discharge pipe 8 connected to the discharge support 2. The discharge motor 12 is started, which drives the spiral discharge rod 11 inside the inclined discharge pipe 8 to rotate. The spiral propulsion action is used to transport the sludge upward along the pipe and finally discharge it directionally from the opening on the lower side of the top, which facilitates subsequent collection or transfer and avoids sludge blockage.

[0049] Shutdown and Cleaning Phase: After all the sludge has been processed, turn off the mixing motor 14, rotating motor 17, electrode needle 4 power supply, heater 9, blower 10, and discharge motor 12 in sequence. Clean the residual sludge in the feed box 3, conveyor frame, and inclined discharge pipe 8, check the wear of each component, and lubricate and maintain the rotating parts to prepare for the next use.

[0050] Finally, the following points should be noted: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection", and "linkage" should be interpreted broadly, and can be mechanical or electrical connections, or internal connections between two components, or direct connections. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may change. Secondly: The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other. Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A circulating heavy metal contaminated sludge remediation device, comprising a treatment support (1) and a discharge support (2), characterized in that: The upper end of the treatment bracket (1) is equipped with a feeding box (3). Electrode needles (4) for electric repair are evenly arranged on the inner side of the feeding box (3). The electrode needles (4) are electrically connected to the power supply. An upper conveyor frame (5) is installed in the treatment bracket (1) below the outlet of the feeding box (3). A lower conveyor frame (6) is set below the upper conveyor frame (5) in a staggered manner. The lower conveyor frame (6) transports the sludge to the discharge port (7). An inclined discharge pipe (8) installed on the discharge bracket (2) is connected to the discharge port (7). A spiral discharge rod (11) is installed inside the inclined discharge pipe (8). A discharge motor (12) is fixed at the tail end of the inclined discharge pipe (8). The discharge motor (12) drives the discharge rod (11) to rotate. An opening is provided on the lower side of the top of the inclined discharge pipe (8). The opening is used to discharge the treated sludge. A stirring rod (13) is movably installed inside the feed box (3) via a shaft and bearing. One of the stirring rods (13) extends out of the feed box (3) and is fixedly connected to the stirring motor (14). The stirring motor (14) is installed on one side of the feed box (3) via a connecting frame. The other ends of the two stirring rods (13) extend out of the feed box (3) and are connected by a sprocket and a chain for transmission. Each stirring rod (13) has stirring rods (15) evenly arranged on its surface. A rotating roller (16) is movably mounted on the processing bracket (1) below the feed box (3) via a shaft. The tail end of the rotating roller (16) is fixedly connected to a rotating motor (17). The rotating motor (17) is mounted on the side wall of the processing bracket (1). An extrusion roller (18) is movably mounted on the processing bracket (1) on one side of the rotating roller (16) via a shaft and a bearing. There is a gap of 1-4 cm between the rotating roller (16) and the extrusion roller (18).

2. The circulating heavy metal contaminated sludge remediation device according to claim 1, characterized in that: An electric heater (9) is installed on the other side of the feed box (3) on the processing support (1). The side of the electric heater (9) facing the upper conveyor frame (5) and the lower conveyor frame (6) is open. The heated air is blown onto the upper conveyor frame (5) and the lower conveyor frame (6) to heat and remove water from the sludge.

3. The circulating heavy metal contaminated sludge remediation device according to claim 2, characterized in that: A blower (10) is installed below the electric heater (9). A guide groove for air to flow in is opened at the bottom of the electric heater (9). The blower (10) blows air into the electric heater (9).

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