Urban sludge efficient treatment device

Abstract

The application is suitable for the technical field of sludge treatment, and provides a kind of urban sludge efficient treatment equipment, including multistage dehydration tank, pretreatment cylinder is fixed on the upside of multistage dehydration tank, top is equipped with sludge inlet pipe, bottom is connected with discharge pipe;Inside configuration centrifugal stirring assembly and flocculating agent adding assembly, for centrifugal separation and mixing of sludge. The discharge pipe is installed with ultrasonic vibration component, which can destroy the microbial cell structure and release the bound water. Multistage dehydration assembly is located in the dehydration cavity, which adopts gravity, mechanical pressure filtration and vacuum adsorption for multistage dehydration. The treatment cavity is arranged on one side of the dehydration cavity, which has a treatment assembly, and can extract organic matter or stabilize heavy metals from sludge. The treated sludge is discharged through the sludge discharge outlet at the bottom. The application realizes efficient dehydration and resource utilization of urban sludge, and effectively reduces environmental risk.

Description

Technical Field

[0001] This invention belongs to the field of sludge treatment technology, and particularly relates to a high-efficiency urban sludge treatment device. Background Technology

[0002] With the acceleration of urbanization, the volume of sewage treated is increasing daily, resulting in a large amount of urban sludge that urgently needs to be addressed. Traditional sludge treatment methods mainly include landfill, incineration, and land application, but these methods have many limitations. For example, landfill not only occupies a large amount of land resources but may also pollute groundwater due to leachate; while incineration can effectively reduce sludge volume, its high cost and secondary pollution problems cannot be ignored; land application is limited by the content of heavy metals and other harmful substances in the sludge, and direct application may have long-term impacts on the soil environment. Therefore, how to efficiently and environmentally treat urban sludge has become an important issue in the field of environmental protection.

[0003] In recent years, technologies for treating urban sludge have made significant progress, including mechanical dewatering, chemical conditioning, and biological treatment. However, existing technologies often struggle to balance high efficiency with low cost, and remain insufficient in achieving resource utilization. For example, traditional mechanical dewatering methods typically achieve only limited dewatering effects, requiring further treatment to meet discharge or reuse standards; while chemical conditioning can improve dewatering performance, the cost of chemicals is high and may pose a risk of secondary pollution. Furthermore, effectively stabilizing urban sludge containing heavy metals to reduce environmental risks remains a challenge.

[0004] Therefore, in view of the above situation, there is an urgent need to develop a high-efficiency urban sludge treatment device to overcome the shortcomings in current practical applications. Summary of the Invention

[0005] The purpose of this invention is to provide an efficient urban sludge treatment device, which aims to solve the problems mentioned in the background art.

[0006] This invention is implemented as follows: a high-efficiency urban sludge treatment device includes a multi-stage dewatering tank, the bottom of which is fixed with a base support, and further includes:

[0007] A pretreatment cylinder is mounted and fixed on the upper side of a multi-stage dewatering tank. The top of the pretreatment cylinder has a sludge inlet pipe, and the bottom has a discharge pipe. A centrifugal stirring assembly is installed inside the pretreatment cylinder, as well as a flocculant adding assembly. The flocculant adding assembly is used to add flocculant to the inside of the pretreatment cylinder. The centrifugal stirring assembly is used to centrifuge and separate the sludge and mix it with the flocculant. An ultrasonic vibration assembly is also installed on the discharge pipe. The ultrasonic vibration assembly is used to disrupt the microbial cell structure in the sludge and release bound water.

[0008] A multi-stage dewatering assembly is provided, wherein a dewatering chamber is provided on the inner side of the multi-stage dewatering box, and a multi-stage dewatering assembly is installed in the dewatering chamber. The multi-stage dewatering assembly is used to dewater the sludge discharged from the discharge pipe by gravity conveying, mechanical pressure filtration and vacuum adsorption.

[0009] The dewatering chamber is further provided on one side within the multi-stage dewatering tank. A processing component is installed in the processing chamber. The processing component is used to extract organic matter or stabilize heavy metals in the sludge transported by the multi-stage dewatering component. The bottom of the multi-stage dewatering tank is also provided with a sludge discharge outlet that communicates with the processing chamber.

[0010] A further technical solution is provided, wherein a side support arm is fixed to the outer side of the pretreatment cylinder, and the lower end of the side support arm is fixedly connected to the side wall of the multi-stage dewatering tank; the upper and lower parts of the inner side of the pretreatment cylinder are rounded; an annular guide seat is integrally formed on the upper part of the inner side of the pretreatment cylinder, and the inner ring of the annular guide seat is inclined to the inner side wall away from the lower part of the pretreatment cylinder.

[0011] A further technical solution includes a centrifugal mixing assembly comprising a dual-shaft motor located in the middle of the inner side of the pretreatment cylinder, a motor fixing sleeve fixed to the outer side of the dual-shaft motor, and multiple motor support rods circumferentially fixed to the outer side of the motor fixing sleeve. The outer ends of the motor support rods are fixedly connected to the inner wall of the pretreatment cylinder. A centrifugal table is fixed to the upper output end of the dual-shaft motor. The centrifugal table is a conical structure protruding upward in the middle, and the outer ring of the centrifugal table is located above the lower surface of the annular guide seat. Multiple inclined plates are circumferentially fixed to the lower output shaft of the dual-shaft motor. Several mixing columns are fixed to the upper side of the inclined plates. An arc-shaped disturbance plate that cooperates with the lower inner side of the pretreatment cylinder is also fixed to the outer end of the inclined plates. The centrifugal mixing assembly also includes a hanging rod fixed to the lower end of the lower output shaft of the dual-shaft motor. Multiple bottom mixing rods are circumferentially fixed to the lower end of the hanging rod corresponding to the arc-shaped disturbance plate. The bottom mixing rods are horizontally arranged, and several mixing columns are horizontally fixed to both sides of the bottom mixing rods.

[0012] A further technical solution is provided, wherein the flocculant addition component includes an annular pipe fixed to the outside of the pretreatment cylinder, and multiple nozzles communicating with the annular pipe are circumferentially distributed and fixed on the lower side of the annular guide seat. A support is also fixed to the outside of the pretreatment cylinder, a flocculant tank is fixed to the upper side of the support, and a feeding pump is fixed to the lower side of the support. The inlet of the feeding pump is connected to the bottom of the inner cavity of the flocculant tank, and the outlet of the feeding pump is connected to the annular pipe through a conveying pipe.

[0013] In a further technical solution, the ultrasonic vibration assembly includes multiple sets of ultrasonic vibration rods installed inside the discharge pipe and distributed longitudinally. Each set of ultrasonic vibration rods has three rods distributed circumferentially, and two sets of adjacent ultrasonic vibration rods are evenly staggered in the longitudinal direction. The bottom of the pretreatment cylinder is also fixed with an ultrasonic transducer connected to the ultrasonic vibration rods.

[0014] A further technical solution includes a multi-stage dewatering assembly comprising a mesh belt disposed within a dewatering chamber, with side baffles fixed on both sides of the mesh belt; transmission rollers are provided at both ends of the mesh belt, and a transmission shaft is fixed in the middle of the transmission rollers, with both ends of the transmission shaft rotatably connected to the side wall of the multi-stage dewatering chamber; a second motor connected to one of the transmission shafts is also fixed on the side wall of the multi-stage dewatering chamber; a filter press plate is also provided on the lower side of the upper support of the mesh belt, and a filter press seat is provided on the upper side of the upper support of the mesh belt corresponding to the filter press plate; a negative pressure chamber is opened on the inner side of the filter press seat, and several negative pressure holes communicating with the negative pressure chamber are opened at the bottom of the filter press seat; a one-way valve is installed on the negative pressure holes; a negative pressure device communicating with the negative pressure chamber is fixed on the top of the filter press seat, and a water outlet pipe is installed at the outlet of the negative pressure device; a filter press push-pull cylinder is fixed on the upper side of the filter press seat, and the cylinder body of the filter press push-pull cylinder is fixedly connected to the side wall of the multi-stage dewatering chamber through a side support arm.

[0015] A further technical solution is provided in which the bottom of the multi-stage dewatering tank is provided with a drain outlet communicating with the dewatering chamber; the lower end of the discharge pipe corresponds to the left end of the mesh belt, and the left end of the mesh belt is provided with an end baffle, the other end of the end baffle is fixedly connected to the inner wall of the multi-stage dewatering tank; a guide port is also provided on the multi-stage dewatering tank between the dewatering chamber and the treatment chamber, and a scraper is obliquely fixed between the guide port and the end of the mesh belt, and limiting plates for limiting the sludge are also fixed on both sides of the scraper, and a bottom support rod is fixed on the lower side of the scraper, the lower end of the bottom support rod is fixed to the bottom of the dewatering chamber.

[0016] A further technical solution includes a side sealing plate that can block the feed inlet on the side wall of the processing chamber. A sealing push-pull cylinder is fixed on the upper side of the side sealing plate, and the cylinder body of the sealing push-pull cylinder is also fixedly connected to the multi-stage dewatering tank at the top of the processing chamber. A bottom sealing plate that can block the sludge discharge outlet is provided at the bottom of the multi-stage dewatering tank. Guide rails are slidably provided on both sides of the bottom sealing plate, and the guide rails are also fixedly connected to the bottom of the multi-stage dewatering tank. A sealing push-pull cylinder is fixed in the middle of the bottom sealing plate, parallel to the guide rails, and the cylinder body of the sealing push-pull cylinder is also fixedly connected to the bottom of the multi-stage dewatering tank.

[0017] In a further technical solution, the bottom of the processing chamber has an arc-shaped structure. The processing assembly includes a support tube rotatably mounted in the middle of the upper part of the processing chamber. An agitating screen plate that cooperates with the processing chamber is fixed on the support tube. Both sides of the agitating screen plate are provided with additive discharge pipes that communicate with the support tube. A motor is also fixed on the outside of the multi-stage dehydration tank and is driven to one end of the support tube. The motor is used to drive the agitating screen plate to swing back and forth. The other end of the support tube is rotatably connected to a conveying pipe. The other end of the conveying pipe extends to the lower inner part of the additive box and is connected to the outlet of the feeding pump. The additive box is also fixedly connected to the outer wall of the multi-stage dehydration tank.

[0018] In a further technical solution, the substance filled in the additive box is an organic solvent or a heavy metal chelating agent. The organic solvent is acetone or dichloromethane, and the heavy metal chelating agent is sodium diethyldithiocarbamate or disodium ethylenediaminetetraacetate.

[0019] The present invention provides a high-efficiency urban sludge treatment device, which has the following beneficial effects:

[0020] The sludge is added to the inside of the pretreatment cylinder through the sludge inlet pipe. The sludge is first separated by centrifugal mixing components. Then, flocculant is added to the inside of the pretreatment cylinder by flocculant adding components. With the help of centrifugal mixing components, the sludge and flocculant can be mixed evenly. The sludge falls into the discharge pipe and is destroyed by ultrasonic vibration components, which destroys the microbial cell structure in the sludge, releases bound water, and improves the overall dewatering performance of the sludge.

[0021] The multi-stage dewatering unit can dewater the sludge discharged from the outlet pipe by gravity conveying, mechanical pressure filtration, and vacuum adsorption. First, some free water is removed under gravity. Mechanical pressure filtration combined with vacuum adsorption further compresses the sludge volume and uses negative pressure to adsorb residual water in the sludge, thereby further reducing the sludge moisture content.

[0022] The treatment unit can extract organic matter or stabilize heavy metals in the sludge transported by the multi-stage dewatering unit, and finally discharge the treated sludge through the sludge discharge outlet. The extracted organic matter can be used to prepare bio-organic fertilizer or energy materials, realizing the resource utilization of sludge. The heavy metal stabilization treatment can effectively reduce the environmental risks of subsequent sludge disposal.

[0023] In summary, this invention significantly improves the dewatering performance and resource utilization rate of sludge through the combined effects of centrifugal separation, flocculant mixing, ultrasonic vibration to disrupt the microbial cell structure and release bound water, and multi-stage dewatering and treatment components, while reducing the environmental risks of subsequent disposal. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the efficient urban sludge treatment equipment provided in an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Another perspective structural diagram;

[0026] Figure 3 An isometric view of an efficient urban sludge treatment device provided in an embodiment of the present invention;

[0027] Figure 4 for Figure 3 Enlarged structural diagram of the pretreatment cylinder section;

[0028] Figure 5 This is a three-dimensional structural diagram of the internal components of the pretreatment cylinder in the urban sludge high-efficiency treatment equipment provided in an embodiment of the present invention;

[0029] Figure 6 for Figure 3 Enlarged structural diagram of the medium-pressure filter base section;

[0030] Figure 7 for Figure 1 A magnified structural diagram of part A in the middle;

[0031] Figure 8 for Figure 3 A magnified structural diagram of part B.

[0032] In the diagram: 1-Bottom support, 2-Multi-stage dewatering tank, 3-Side support arm one, 4-End baffle, 5-Dewatering chamber, 6-Pretreatment cylinder, 7-Conveying pipe one, 8-Feeding pump one, 9-Support, 10-Flocculant tank, 11-Sludge inlet pipe, 12-Annular pipe, 13-Filter press push-pull cylinder, 14-Side support arm two, 15-Filter press seat, 16-Sealing push-pull cylinder one, 17-Motor one, 18-Motor two, 19-Mesh belt, 20-Side baffle, 21-Support pipe, 22-Conveying pipe two, 23-Additive box, 24-Bottom sealing plate, 25-Guide rail, 26-Sealing push-pull cylinder two, 27-Drain outlet, 28-Drive roller, 29-Drive shaft, 30 - Filter press support plate, 31- Bottom support rod, 32- Scraper plate, 33- Processing chamber, 34- Sludge discharge port, 35- Side sealing plate, 36- Guide port, 37- Agitator screen, 38- Nozzle, 39- Annular guide seat, 40- Centrifuge table, 41- Motor support rod, 42- Motor fixing sleeve, 43- Dual-shaft motor, 44- Arc-shaped disturbance plate, 45- Mixing column one, 46- Inclined plate, 47- Ultrasonic transducer, 48- Discharge pipe, 49- Ultrasonic vibrating rod, 50- Hanging rod, 51- Mixing column two, 52- Bottom mixing rod, 53- Negative pressure hole, 54- Negative pressure chamber, 55- Water outlet pipe, 56- Negative pressure device, 57- Additive discharge pipe. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0035] like Figure 1-4 As shown, an embodiment of the present invention provides a high-efficiency urban sludge treatment device, including a multi-stage dewatering tank 2, the bottom of which is fixed with a base support 1, and further comprising:

[0036] A pretreatment cylinder 6 is mounted and fixed on the upper side of the multi-stage dewatering tank 2. The top of the pretreatment cylinder 6 is equipped with a sludge inlet pipe 11, and the bottom is equipped with a discharge pipe 48. A centrifugal stirring assembly is installed inside the pretreatment cylinder 6, and a flocculant adding assembly is also installed on the pretreatment cylinder 6. The flocculant adding assembly is used to add flocculant to the inside of the pretreatment cylinder 6. The centrifugal stirring assembly is used to centrifuge and separate the sludge and mix the sludge with the flocculant. An ultrasonic vibration assembly is also installed on the discharge pipe 48. The ultrasonic vibration assembly is used to destroy the microbial cell structure in the sludge and release bound water.

[0037] A multi-stage dewatering assembly is provided. The multi-stage dewatering box 2 has a dewatering chamber 5 on its inner side. The dewatering chamber 5 is equipped with a multi-stage dewatering assembly. The multi-stage dewatering assembly is used to dewater the sludge discharged from the discharge pipe 48 by conveying gravity dewatering, mechanical pressure filtration dewatering and vacuum adsorption dewatering.

[0038] The processing chamber 33 is also provided on one side of the dewatering chamber 5 within the multi-stage dewatering tank 2. A processing component is installed in the processing chamber 33. The processing component is used to extract organic matter or stabilize heavy metals in the sludge transported by the multi-stage dewatering component. The bottom of the multi-stage dewatering tank 2 is also provided with a sludge discharge outlet 34 that communicates with the processing chamber 33.

[0039] In this embodiment of the invention, sludge is added to the inside of the pretreatment cylinder 6 through the sludge inlet pipe 11. The sludge is first centrifuged and separated by the centrifugal stirring component. Then, flocculant is added to the inside of the pretreatment cylinder 6 by the flocculant adding component. With the help of the centrifugal stirring component, the sludge and flocculant can be mixed evenly. The sludge falls into the discharge pipe 48 and can be destroyed by the ultrasonic vibration component to break the microbial cell structure in the sludge, release bound water, and improve the overall dewatering performance of the sludge.

[0040] The multi-stage dewatering unit can dewater the sludge discharged from the discharge pipe 48 by gravity conveying, mechanical pressure filtration and vacuum adsorption. First, some free water is removed under gravity. Mechanical pressure filtration combined with vacuum adsorption further compresses the sludge volume and uses negative pressure to adsorb the residual water in the sludge, thereby further reducing the sludge moisture content (below 40%).

[0041] The treatment unit can extract organic matter or stabilize heavy metals in the sludge transported by the multi-stage dewatering unit, and finally discharge the treated sludge through the sludge discharge outlet 34. The extracted organic matter can be used to prepare bio-organic fertilizer or energy materials, realizing the resource utilization of sludge. The heavy metal stabilization treatment can effectively reduce the environmental risks of subsequent sludge disposal.

[0042] like Figure 1-5 As shown, in a preferred embodiment of the present invention, a side support arm 3 is fixed to the outer side of the pretreatment cylinder 6, and the lower end of the side support arm 3 is fixedly connected to the side wall of the multi-stage dewatering tank 2. The upper and lower parts of the inner side of the pretreatment cylinder 6 are rounded to avoid material residue.

[0043] The upper inner side of the pretreatment cylinder 6 is also integrally formed with an annular guide seat 39. The inner ring of the annular guide seat 39 is inclined at the bottom away from the inner wall of the pretreatment cylinder 6, so that the annular guide seat 39 can be adapted to the centrifugal stirring component and the flocculant adding component.

[0044] The centrifugal stirring assembly includes a dual-shaft motor 43 located in the middle of the inner side of the pretreatment cylinder 6. A motor fixing sleeve 42 is fixed to the outer side of the dual-shaft motor 43. Multiple motor support rods 41 are circumferentially fixed to the outer side of the motor fixing sleeve 42. The outer ends of the motor support rods 41 are fixedly connected to the inner wall of the pretreatment cylinder 6. A centrifugal table 40 is fixed to the upper output end of the dual-shaft motor 43. The centrifugal table 40 is a conical structure with an upward protrusion in the middle, and the outer ring of the centrifugal table 40 is located above the lower surface of the annular guide seat 39, so that the annular guide seat 39 and the centrifugal table 40 can move together. The dual-axis motor 43 has multiple inclined plates 46 circumferentially fixed on its lower output shaft. Several mixing columns 45 are fixed on the upper side of the inclined plates 46. An arc-shaped disturbance plate 44 that cooperates with the lower inner side of the pretreatment cylinder 6 is also fixed at the outer end of the inclined plates 46. Centrifugation can be performed using the centrifuge table 40. The sludge then slides down through the annular guide seat 39 and will not fall along the inner wall of the pretreatment cylinder 6, which is conducive to the subsequent mixing of flocculants. The combination of the arc-shaped disturbance plate 44, the mixing columns 45 and the inclined plates 46 can make the flocculant and sludge fully mixed.

[0045] Preferably, the centrifugal mixing assembly further includes a suspension rod 50 fixed to the lower output shaft end of the dual-shaft motor 43. Multiple bottom mixing rods 52 are circumferentially fixed at the lower end of the suspension rod 50 corresponding to the arc-shaped disturbance plate 44. The bottom mixing rods 52 are horizontally arranged, and several mixing columns 51 are horizontally fixed on both sides of the bottom mixing rods 52. The combination of the suspension rod 50, mixing columns 51 and bottom mixing rods 52 can further agitate the sludge flowing into and out of the feed pipe 48. As the speed of the dual-shaft motor 43 increases, the mixing columns 51 and bottom mixing rods 52 also have the effect of delaying the outflow of sludge, so that the flocculant and sludge are fully mixed.

[0046] The flocculant addition assembly includes an annular pipe 12 fixed to the outside of the pretreatment cylinder 6. Multiple nozzles 38, communicating with the annular pipe 12, are circumferentially distributed and fixed on the lower side of the annular guide seat 39. A support 9 is also fixed to the outside of the pretreatment cylinder 6. A flocculant tank 10 is fixed to the upper side of the support 9, and a feed pump 8 is fixed to the lower side of the support 9. The inlet of the feed pump 8 communicates with the bottom of the inner cavity of the flocculant tank 10, and the outlet of the feed pump 8 communicates with the annular pipe 12 through a delivery pipe 7. The flocculant delivered by the feed pump 8 is distributed in the annular pipe 12 and finally sprayed out through the nozzles 38. The annular guide seat 39 can shield the nozzles 38, preventing sludge from affecting them. Sludge sliding down from the annular guide seat 39 can fully interact with the flocculant sprayed from the nozzles 38, ensuring high reliability. The flocculant filled in the flocculant tank 10 is either polyacrylamide flocculant or polyaluminum chloride flocculant.

[0047] The ultrasonic vibration assembly includes multiple sets of ultrasonic vibrating rods 49 installed inside the discharge pipe 48 and distributed longitudinally. Each set of ultrasonic vibrating rods 49 has three rods distributed circumferentially, and two sets of adjacent ultrasonic vibrating rods 49 are evenly staggered in the longitudinal direction. The bottom of the pretreatment cylinder 6 is also fixed with an ultrasonic transducer 47 connected to the ultrasonic vibrating rods 49. When the ultrasonic transducer 47 is turned on, the high-frequency vibration generated by the ultrasonic vibrating rods 49 is transmitted to the flowing sludge, which has the effect of breaking up the sludge, destroying the microbial cell structure in the sludge, releasing bound water, and improving the subsequent dewatering performance of the sludge.

[0048] like Figure 1 , 3 As shown in Figures 6 and 7, in a preferred embodiment of the present invention, the multi-stage dewatering assembly includes a mesh belt 19 disposed within the dewatering chamber 5, made of 316L stainless steel, which is corrosion-resistant and has a porosity ≤0.1mm to ensure dewatering efficiency. Side baffles 20 are fixed on both sides of the mesh belt 19. The side baffles 20 can be made of a suitable material to block sludge without affecting the operation of the mesh belt 19. Drive rollers 28 are provided at both ends of the mesh belt 19, and a drive shaft 29 is fixed in the middle of the drive rollers 28. The two ends of the drive shaft 29 are rotatably connected to the side wall of the multi-stage dewatering tank 2. A motor 21, which is connected to one of the drive shafts 29, is also fixed on the side wall of the multi-stage dewatering tank 2. 8; The upper part of the mesh belt 19 is also provided with a filter press plate 30 on the lower side. The upper part of the mesh belt 19 is provided with a filter press seat 15 corresponding to the filter press plate 30. A negative pressure chamber 54 is opened on the inner side of the filter press seat 15. Several negative pressure holes 53 communicating with the negative pressure chamber 54 are opened at the bottom of the filter press seat 15. A one-way valve (not shown) is installed on the negative pressure hole 53. A negative pressure device 56 communicating with the negative pressure chamber 54 is fixed on the top of the filter press seat 15. A water outlet pipe 55 is installed at the outlet of the negative pressure device 56. A filter press push-pull cylinder 13 is fixed on the upper side of the filter press seat 15. The cylinder body of the filter press push-pull cylinder 13 is fixedly connected to the side wall of the multi-stage dewatering tank 2 through the side support arm 2 14. The mesh belt 19 can transport sludge and dewater it by gravity. When the sludge reaches the area where the filter press plate 30 and the filter press seat 15 are located, the filter press push-pull cylinder 13 drives the filter press seat 15 to descend. The filter press seat 15 and the filter press plate 30 cooperate to filter the sludge. Then, the negative pressure device 56 is activated to perform negative pressure suction, which can further dewater the sludge.

[0049] Preferably, the bottom of the multi-stage dewatering tank 2 is provided with a drain outlet 27 communicating with the dewatering chamber 5, through which water is discharged; the lower end of the discharge pipe 48 corresponds to the left end of the mesh belt 19, and the left end of the mesh belt 19 is provided with an end baffle 4, the other end of the end baffle 4 is fixedly connected to the inner wall of the multi-stage dewatering tank 2, and the end baffle 4 plays the role of blocking sludge, so that the mesh belt 19 can reliably transport sludge; a guide port 36 is also provided on the multi-stage dewatering tank 2 between the dewatering chamber 5 and the treatment chamber 33, and a scraper 32 is obliquely fixed between the guide port 36 and the end of the mesh belt 19. Limiting plates (not shown) for limiting the sludge are also fixed on both sides of the scraper 32, and a bottom support rod 31 is fixed on the lower side of the scraper 32. The lower end of the bottom support rod 31 is fixed to the bottom of the dewatering chamber 5, which plays the role of stabilizing the scraper 32.

[0050] Preferably, a side sealing plate 35 capable of blocking the feed inlet 36 is slidably provided on the side wall of the processing chamber 33. A sealing push-pull cylinder 16 is fixed on the upper side of the side sealing plate 35. The cylinder body of the sealing push-pull cylinder 16 is also fixedly connected to the multi-stage dewatering tank 2 at the top of the processing chamber 33. By driving the side sealing plate 35 to rise and fall through the sealing push-pull cylinder 16, the blocking control of the feed inlet 36 can be realized, so that the processing chamber 33 can reliably process sludge.

[0051] Through comparative experiments on dehydration performance, the multi-stage dehydration components of this invention can reduce the moisture content to below 40% after dehydration, while shortening the processing time and reducing energy consumption.

[0052] like Figure 1-3 As shown in Figure 8, in a preferred embodiment of the present invention, the bottom of the processing chamber 33 has an arc-shaped structure. The processing assembly includes a support pipe 21 rotatably mounted on the upper middle part of the processing chamber 33. An agitator plate 37 cooperating with the processing chamber 33 is fixed on the support pipe 21. Both sides of the agitator plate 37 are provided with additive discharge pipes 57 communicating with the support pipe 21. The outside of the multi-stage dehydration tank 2 is also fixed with a motor 17 that is driven to one end of the support pipe 21. The motor 17 is used to drive the agitator plate 37 to swing back and forth. The other end of the support pipe 21 is rotatably connected to a conveying pipe 22. The other end of the conveying pipe 22 extends to the lower inner part of the additive box 23 and is connected to the outlet of the feeding pump 2 (not shown). The additive box 23 is also fixedly connected to the outer wall of the multi-stage dehydration tank 2. When the motor 17 drives the agitator plate 37 to swing back and forth, it does not affect the delivery of additives to the support pipe 21 through the delivery pipe 22, and the additives discharged through the additive discharge pipe 57 can interact with the agitator plate 37 to improve the mixing effect with the sludge.

[0053] The additive tank 23 is filled with an organic solvent (which can extract organic matter under stirring conditions of the agitator 37). The organic solvent is acetone or dichloromethane. The extracted mixture is discharged through the sludge discharge outlet 34 and separated to obtain an extract rich in organic matter and a solid residue. In subsequent processes, the solid residue can be enzymatically hydrolyzed to decompose the remaining organic matter and further improve the extraction rate. According to the heavy metal detection results in the sludge, when heavy metal stabilization treatment is required, the additive tank 23 is filled with a heavy metal chelating agent. The heavy metal chelating agent is sodium diethyldithiocarbamate or disodium ethylenediaminetetraacetate, which chelates with the heavy metals in the sludge to form stable complexes, reducing the migration and biotoxicity of heavy metals.

[0054] It should be noted that when the organic matter content in the sludge is high, organic matter extraction can be selected; when the heavy metal content in the sludge is high, heavy metal stabilization treatment can be selected. If both are required, an additional reaction vessel can be added, which will not be limited or elaborated here. The specific process is as follows: the processing mode can be selected through the control panel of the equipment (not shown), the system automatically switches the type of reagent in the additive tank 23 (two additive tanks 23 can be arranged to freely switch between supplying organic solvents or chelating agents), and adjusts the oscillation frequency of the stirring screen 37.

[0055] Preferably, the bottom of the multi-stage dewatering tank 2 is provided with a bottom sealing plate 24 that can block the sludge discharge outlet 34. Guide rails 25 are slidably provided on both sides of the bottom sealing plate 24. The guide rails 25 are also fixedly connected to the bottom of the multi-stage dewatering tank 2 to ensure the strength of the bottom sealing plate 24. A sealing push-pull cylinder 26 parallel to the guide rails 25 is fixed in the middle of the bottom sealing plate 24. The cylinder body of the sealing push-pull cylinder 26 is also fixedly connected to the bottom of the multi-stage dewatering tank 2. The movement of the bottom sealing plate 24 can be controlled by the sealing push-pull cylinder 26.

[0056] The above embodiments of the present invention provide a high-efficiency urban sludge treatment device, the working principle of which is as follows:

[0057] Sludge is added into the pretreatment cylinder 6 through sludge inlet pipe 11, where it is first centrifuged by the centrifugal stirring component. The flocculant adding component adds flocculant (such as polyacrylamide or polyaluminum chloride) to the pretreatment cylinder 6, working in conjunction with the centrifugal stirring component to ensure thorough and uniform mixing of the sludge and flocculant. The pre-treated sludge falls into the discharge pipe 48. During this process, the ultrasonic vibration component uses high-frequency vibration to disrupt the microbial cell structure in the sludge, releasing bound water and improving subsequent dewatering efficiency.

[0058] The pretreated sludge enters the mesh belt 19 inside the multi-stage dewatering tank 2, where it undergoes initial dewatering under gravity. Next, the sludge reaches the filter press plate 30 and filter press seat 15 area, where it is further compressed by mechanical filtration. Vacuum adsorption dewatering is then performed using the negative pressure device 56 to remove residual moisture, reducing the sludge moisture content to below 40%.

[0059] After dehydration, the sludge enters the treatment chamber 33 through the feed inlet 36. Depending on the specific condition of the sludge, organic matter extraction or heavy metal stabilization treatment is selected. During the organic matter extraction process, an organic solvent (such as acetone or dichloromethane) is transported to the additive discharge pipe 57 to mix with the sludge and extract the organic matter. In the heavy metal stabilization treatment, a heavy metal chelating agent (such as sodium diethyldithiocarbamate or disodium ethylenediaminetetraacetate) is used to react with the heavy metals, reducing their migration and biotoxicity.

[0060] In summary, this invention significantly improves the dewatering performance and resource utilization rate of sludge through the combined effects of centrifugal separation, flocculant mixing, ultrasonic vibration to disrupt the microbial cell structure and release bound water, and multi-stage dewatering and treatment components, while reducing the environmental risks of subsequent disposal.

[0061] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this invention does not involve any improvement to the software and methods.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are 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. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A high-efficiency urban sludge treatment device, comprising a multi-stage dewatering tank (2), wherein a bottom support (1) is fixed to the bottom of the multi-stage dewatering tank (2), characterized in that, Also includes: A pretreatment cylinder (6) is mounted and fixed on the upper side of a multi-stage dewatering tank (2). The top of the pretreatment cylinder (6) is provided with a sludge inlet pipe (11), and the bottom of the pretreatment cylinder (6) is provided with a discharge pipe (48). A centrifugal stirring assembly is installed inside the pretreatment cylinder (6), and a flocculant adding assembly is also installed on the pretreatment cylinder (6). The flocculant adding assembly is used to add flocculant to the inside of the pretreatment cylinder (6), and the centrifugal stirring assembly is used to centrifuge and separate the sludge and mix the sludge with the flocculant. An ultrasonic vibration assembly is also installed on the discharge pipe (48). The ultrasonic vibration assembly is used to destroy the microbial cell structure in the sludge and release bound water. A multi-stage dewatering assembly is provided. The multi-stage dewatering box (2) has a dewatering chamber (5) on its inner side. The dewatering chamber (5) is equipped with a multi-stage dewatering assembly. The multi-stage dewatering assembly is used to dewater the sludge discharged from the discharge pipe (48) by conveying gravity dewatering, mechanical pressure filtration dewatering and vacuum adsorption dewatering. The processing chamber (33) is located on one side of the dewatering chamber (5) within the multi-stage dewatering tank (2). A processing component is installed in the processing chamber (33) for extracting organic matter or stabilizing heavy metals in the sludge transported by the multi-stage dewatering component. The bottom of the multi-stage dewatering tank (2) is also provided with a sludge discharge port (34) that communicates with the processing chamber (33). The upper inner side of the pretreatment cylinder (6) is also integrally formed with an annular guide seat (39). The centrifugal stirring assembly includes a dual-shaft motor (43) located in the middle of the inner side of the pretreatment cylinder (6). A motor fixing sleeve (42) is fixed on the outer side of the dual-shaft motor (43). Multiple motor support rods (41) are fixedly distributed around the outer side of the motor fixing sleeve (42). The outer ends of the motor support rods (41) are fixedly connected to the inner wall of the pretreatment cylinder (6). The upper output end of the dual-axis motor (43) is fixed with a centrifugal table (40). The centrifugal table (40) is a cone-shaped structure with the middle protruding upward, and the outer ring of the centrifugal table (40) is located on the upper side of the lower surface of the annular guide seat (39). The lower output shaft of the dual-axis motor (43) has multiple inclined plates (46) fixed in a circumferential direction. Several mixing columns (45) are fixed on the upper side of the inclined plates (46). The outer end of the inclined plates (46) is also fixed with an arc-shaped disturbance plate (44) that cooperates with the lower inner side of the pretreatment cylinder (6). The centrifugal mixing assembly also includes a suspension rod (50) fixed to the lower output shaft end of the dual-shaft motor (43). The lower end of the suspension rod (50) is circumferentially fixed with multiple bottom mixing rods (52) corresponding to the arc-shaped disturbance plate (44). The bottom mixing rods (52) are horizontally set, and several mixing columns (51) are also horizontally fixed on both sides of the bottom mixing rods (52).

2. The urban sludge high-efficiency treatment equipment according to claim 1, characterized in that, The pretreatment cylinder (6) is fixed with a side support arm (3) on the outside, and the lower end of the side support arm (3) is fixedly connected to the side wall of the multi-stage dehydration tank (2). The upper and lower parts of the inner side of the pretreatment cylinder (6) are rounded. The inner ring of the annular guide seat (39) is inclined to the inner wall of the lower part away from the pretreatment cylinder (6).

3. The urban sludge high-efficiency treatment equipment according to claim 2, characterized in that, The flocculant addition assembly includes an annular tube (12) fixed to the outside of the pretreatment cylinder (6), and multiple nozzles (38) connected to the annular tube (12) are fixedly distributed circumferentially on the lower side of the annular guide seat (39). The pretreatment cylinder (6) is also fixed with a support (9) on the outside. A flocculant tank (10) is fixed on the upper side of the support (9). A feed pump (8) is fixed on the lower side of the support (9). The inlet of the feed pump (8) is connected to the bottom of the inner cavity of the flocculant tank (10). The outlet of the feed pump (8) is connected to the annular pipe (12) through the conveying pipe (7).

4. The high-efficiency urban sludge treatment equipment according to claim 3, characterized in that, The ultrasonic vibration assembly includes multiple sets of ultrasonic vibrating rods (49) installed inside the discharge pipe (48) and distributed longitudinally. Each set of ultrasonic vibrating rods (49) has three rods distributed circumferentially, and two sets of ultrasonic vibrating rods (49) that are adjacent in the longitudinal direction are evenly staggered. The bottom of the pretreatment cylinder (6) is also fixed with an ultrasonic transducer (47) connected to the ultrasonic vibrating rod (49).

5. The urban sludge high-efficiency treatment equipment according to any one of claims 1-4, characterized in that, The multi-stage dehydration assembly includes a mesh belt (19) disposed in the dehydration chamber (5), and side baffles (20) are fixed on both sides of the mesh belt (19). The mesh belt (19) is provided with transmission rollers (28) at both ends, and a transmission shaft (29) is fixed in the middle of the transmission rollers (28). The two ends of the transmission shaft (29) are rotatably connected to the side wall of the multi-stage dehydration tank (2). A motor (18) that is connected to one of the transmission shafts (29) is also fixed on the side wall of the multi-stage dehydration tank (2). The upper part of the mesh belt (19) is also provided with a filter press plate (30) on the lower side. The upper part of the mesh belt (19) is provided with a filter press seat (15) corresponding to the filter press plate (30). A negative pressure chamber (54) is opened on the inner side of the filter press seat (15). Several negative pressure holes (53) communicating with the negative pressure chamber (54) are opened at the bottom of the filter press seat (15). A one-way valve is installed on the negative pressure hole (53). The top of the filter press (15) is fixed with a negative pressure device (56) that communicates with the negative pressure chamber (54), and a water outlet pipe (55) is installed at the outlet of the negative pressure device (56). The filter press seat (15) is fixed with a filter press push-pull cylinder (13) on its upper side. The cylinder body of the filter press push-pull cylinder (13) is fixedly connected to the side wall of the multi-stage dewatering tank (2) through the side support arm (14).

6. The high-efficiency urban sludge treatment equipment according to claim 5, characterized in that, The bottom of the multi-stage dehydration tank (2) is provided with a drain outlet (27) that communicates with the dehydration chamber (5); The lower end of the discharge pipe (48) corresponds to the left end of the mesh belt (19), and the left end of the mesh belt (19) is provided with an end baffle (4), and the other end of the end baffle (4) is fixedly connected to the inner wall of the multi-stage dewatering tank (2). The multi-stage dewatering tank (2) between the dewatering chamber (5) and the treatment chamber (33) is also provided with a guide port (36). A scraper plate (32) is obliquely fixed between the guide port (36) and the end of the mesh belt (19). Limiting plates for limiting the sludge are also fixed on both sides of the scraper plate (32). A bottom support rod (31) is also fixed on the lower side of the scraper plate (32). The lower end of the bottom support rod (31) is fixed to the bottom of the dewatering chamber (5).

7. The high-efficiency urban sludge treatment equipment according to claim 6, characterized in that, The side wall of the processing chamber (33) is slidably provided with a side sealing plate (35) that can block the feed inlet (36). A sealing push-pull cylinder (16) is fixed on the upper side of the side sealing plate (35). The cylinder body of the sealing push-pull cylinder (16) is also fixedly connected to the multi-stage dehydration tank (2) at the top of the processing chamber (33). The bottom of the multi-stage dewatering tank (2) is provided with a bottom sealing plate (24) that can block the sludge discharge outlet (34). The bottom sealing plate (24) is provided with guide rails (25) on both sides. The guide rails (25) are also fixedly connected to the bottom of the multi-stage dewatering tank (2). The middle part of the bottom sealing plate (24) is fixed with a sealing push-pull cylinder two (26) parallel to the guide rail (25). The cylinder body of the sealing push-pull cylinder two (26) is also fixedly connected to the bottom of the multi-stage dewatering tank (2).

8. The urban sludge high-efficiency treatment equipment according to any one of claims 1-4, characterized in that, The bottom of the processing chamber (33) is an arc-shaped structure. The processing assembly includes a support tube (21) rotatably installed in the middle of the upper part of the processing chamber (33). A stirring mesh plate (37) that cooperates with the processing chamber (33) is fixed on the support tube (21). Additive discharge pipes (57) that communicate with the support tube (21) are provided on both sides of the stirring mesh plate (37). The multi-stage dehydration tank (2) is also fixed with a motor (17) that is connected to one end of the support pipe (21). The motor (17) is used to drive the stirring screen (37) to swing back and forth. The other end of the support pipe (21) is rotatably connected to a conveying pipe (22). The other end of the conveying pipe (22) extends to the lower inner side of the additive box (23) and is connected to the outlet of the feeding pump. The additive box (23) is also fixedly connected to the outer wall of the multi-stage dehydration tank (2).

9. The high-efficiency urban sludge treatment equipment according to claim 8, characterized in that, The additive box (23) is filled with an organic solvent or a heavy metal chelating agent. The organic solvent is acetone or dichloromethane, and the heavy metal chelating agent is sodium diethyldithiocarbamate or disodium ethylenediaminetetraacetate.

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