Urban sludge efficient treatment equipment

Abstract

The invention is suitable for the technical field of sludge treatment, and provides efficient urban sludge treatment equipment which comprises a multi-stage dehydration box, a pretreatment cylinder is fixed to the upper side of the multi-stage dehydration box, a sludge inlet pipe is arranged at the top of the pretreatment cylinder, and a discharging pipe is connected to the bottom of the pretreatment cylinder; a centrifugal stirring assembly and a flocculating agent adding assembly are arranged in the device and are used for centrifugal separation and uniform mixing of sludge. And the discharge pipe is provided with an ultrasonic vibration assembly which can destroy the microbial cell structure to release bound water. The multistage dehydration assembly is located in the dehydration cavity, and multistage dehydration is carried out through gravity, mechanical filter pressing and vacuum adsorption. The treatment cavity is arranged on one side of the dehydration cavity, internally provided with a treatment assembly and capable of conducting organic matter extraction or heavy metal stabilization treatment on the sludge. And the treated sludge is discharged through a sludge discharge port at the bottom. According to the method, efficient dehydration and resource utilization of the urban sludge are achieved, and meanwhile the environmental risk is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a highly efficient urban sludge treatment device. Background Art

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

[0003] In recent years, the treatment technology for urban sludge has developed significantly, including mechanical dehydration, chemical conditioning, biological treatment and other methods. However, existing technologies often find it difficult to balance the requirements of high efficiency and low cost, and there are still major deficiencies in achieving resource utilization. For example, traditional mechanical dehydration methods can usually only achieve limited dehydration effects, and further treatment is required to meet discharge or reuse standards; although chemical conditioning can improve dehydration performance, the cost of the agent is high and may bring secondary pollution risks. In addition, for urban sludge containing heavy metals, how to effectively stabilize the treatment to reduce environmental risks is also a challenge.

[0004] Therefore, in view of the above situation, it is urgent to develop an efficient urban sludge treatment equipment to overcome the shortcomings in current practical applications. Summary of the invention

[0005] The purpose of the present invention is to provide an efficient urban sludge treatment device, aiming to solve the problems mentioned in the above background technology.

[0006] The present invention is implemented as follows: an efficient urban sludge treatment device comprises a multi-stage dehydration box, a bottom bracket is fixed to the bottom of the multi-stage dehydration box, and further comprises: A pretreatment cylinder, wherein the pretreatment cylinder is mounted and fixed on the upper side of the multi-stage dehydration box, a sludge inlet pipe is arranged on the top of the pretreatment cylinder, a discharge pipe is arranged on the bottom of the pretreatment cylinder, a centrifugal stirring assembly is installed on the inner side of the pretreatment cylinder, a flocculant adding assembly is also installed on the pretreatment cylinder, the flocculant adding assembly is used to add flocculant to the inner side of the pretreatment cylinder, the centrifugal stirring assembly is used to centrifugally separate the sludge and mix the sludge with the flocculant; an ultrasonic vibration assembly is also installed on the discharge pipe, and the ultrasonic vibration assembly is used to destroy the microbial cell structure in the sludge and release bound water; Multi-stage dehydration assembly. A dehydration chamber is provided inside the multi-stage dehydration tank, and a multi-stage dehydration assembly is installed in the dehydration chamber. The multi-stage dehydration assembly is used for conveying-type gravity dehydration, mechanical pressure filtration dehydration, and vacuum adsorption dehydration of the sludge discharged from the discharge pipe. Treatment chamber. A treatment chamber is further provided inside the multi-stage dehydration tank on one side of the dehydration chamber, and a treatment assembly is installed in the treatment chamber. The treatment assembly is used for organic matter extraction or heavy metal stabilization treatment of the sludge conveyed by the multi-stage dehydration assembly. A sludge discharge port communicating with the treatment chamber is also provided at the bottom of the multi-stage dehydration tank.

[0007] Further technical solution. A first side support arm is fixed to the outer side of the pretreatment cylinder, and the lower end of the first side support arm is fixedly connected to the side wall of the multi-stage dehydration tank. The upper and lower parts of the inner side of the pretreatment cylinder are both rounded. An annular guide seat is integrally formed on the upper part of the inner side of the pretreatment cylinder, and the inner circle of the annular guide seat is inclined downward away from the inner side wall of the pretreatment cylinder.

[0008] Further technical solution. The centrifugal stirring assembly includes a dual-axis motor provided in the middle of the inner side of the pretreatment cylinder. A motor fixing sleeve is fixed to the outer side of the dual-axis motor, and a plurality of motor support rods are circumferentially distributed and fixed to the outer side of the motor fixing sleeve. The outer ends of the motor support rods are fixedly connected to the inner side wall of the pretreatment cylinder. An upper output end of the dual-axis motor is fixedly connected with a centrifugal table. 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. A plurality of inclined plates are circumferentially distributed and fixed on the lower output shaft of the dual-axis motor. A plurality of first mixing columns are fixed to the upper side of the inclined plates, and an arc-shaped disturbance plate matching the lower part of the inner side of the pretreatment cylinder is also fixed to the outer ends of the inclined plates. The centrifugal stirring assembly further includes a suspension rod fixed to the end of the lower output shaft of the dual-axis motor. A plurality of bottom mixing rods are circumferentially distributed and fixed to the lower end of the suspension rod corresponding to the arc-shaped disturbance plate. The bottom mixing rods are horizontally arranged, and a plurality of second mixing columns are horizontally fixed to both sides of the bottom mixing rods.

[0009] Further technical solution. The flocculant adding assembly includes an annular pipe fixed to the outer side of the pretreatment cylinder. A plurality of nozzles communicating with the annular pipe are circumferentially distributed and fixed to the lower side of the annular guide seat. A support is also fixed to the outer side of the pretreatment cylinder. A flocculant tank is fixed to the upper side of the support, and a first feeding pump is fixed to the lower side of the support. The inlet of the first feeding pump is communicated with the bottom of the inner cavity of the flocculant tank, and the outlet of the first feeding pump is communicated with the annular pipe through a first conveying pipe.

[0010] Further technical solution. The ultrasonic vibration striking assembly includes multiple groups of ultrasonic vibration rods longitudinally distributed and installed inside the discharge pipe. Three ultrasonic vibration rods are circumferentially distributed in each group, and two longitudinally adjacent groups of ultrasonic vibration rods are evenly staggered. An ultrasonic transducer connected to the ultrasonic vibration rods is also fixed to the bottom of the pretreatment cylinder.

[0011] Further technical solution: The multi-stage dehydration assembly includes a mesh belt disposed in the dehydration chamber, and side baffles are fixed on both sides of the mesh belt; transmission rollers are provided at both ends of the mesh belt, a transmission shaft is fixed in the middle of the transmission roller, and both ends of the transmission shaft are rotatably connected to the side wall of the multi-stage dehydration tank. A second motor drivingly connected to one of the transmission shafts is also fixed on the side wall of the multi-stage dehydration tank; a filter pressing support plate is further disposed in cooperation with the lower side of the upper branch of the mesh belt, and a filter pressing seat is provided corresponding to the filter pressing support plate on the upper side of the upper branch of the mesh belt. A negative pressure chamber is opened inside the filter pressing seat, and a plurality of negative pressure holes communicating with the negative pressure chamber are opened at the bottom of the filter pressing seat. One-way valves are installed on the negative pressure holes. A negative pressure device communicating with the negative pressure chamber is fixed on the top of the filter pressing seat, a water outlet pipe is installed at the outlet of the negative pressure device, a filter pressing push-pull cylinder is fixed on the upper side of the filter pressing seat, and the cylinder body of the filter pressing push-pull cylinder is fixedly connected to the side wall of the multi-stage dehydration tank through a second side support arm.

[0012] Further technical solution: A drain port communicating with the dehydration chamber is provided at the bottom of the multi-stage dehydration tank; the lower end of the discharge pipe corresponds to the left end of the mesh belt, and an end baffle is provided in cooperation with the left end of the mesh belt, and the other end of the end baffle is fixedly connected to the inner wall of the multi-stage dehydration tank; a material guiding port is also opened on the multi-stage dehydration tank between the dehydration chamber and the treatment chamber. A scraping plate is obliquely fixed between the material guiding port and the end of the mesh belt, and limiting plates for limiting the sludge are fixed on both sides of the scraping plate. A bottom support rod is further fixed on the lower side of the scraping plate, and the lower end of the bottom support rod is fixed to the bottom of the dehydration chamber.

[0013] Further technical solution: A side sealing plate capable of blocking the material guiding port is slidably provided on the side wall of the treatment chamber, and a first sealing push-pull cylinder is fixed on the upper side of the side sealing plate, and the cylinder body of the first sealing push-pull cylinder is also fixedly connected to the multi-stage dehydration tank at the top of the treatment chamber; a bottom sealing plate capable of blocking the sludge discharge port is provided at the bottom of the multi-stage dehydration 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 dehydration tank. A second sealing push-pull cylinder parallel to the guide rails is fixed in the middle of the bottom sealing plate, and the cylinder body of the second sealing push-pull cylinder is also fixedly connected to the bottom of the multi-stage dehydration tank.

[0014] Further technical solution: The bottom of the treatment chamber is of an arc-shaped structure. The treatment assembly includes a support pipe rotatably installed in the middle of the upper part of the treatment chamber. A stirring mesh plate matched with the treatment chamber is fixed on the support pipe. Additive discharge pipes communicating with the support pipe are provided on both sides of the stirring mesh plate. A first motor drivingly connected to one end of the support pipe is also fixed outside the multi-stage dehydration tank. The first motor is used to drive the stirring mesh plate to swing reciprocally. The other end of the support pipe is rotatably communicated with a second conveying pipe, and the other end of the second conveying pipe extends to the inner lower part of the additive tank and is connected to the outlet of the second feeding pump. The additive tank is also fixedly connected to the outer wall of the multi-stage dehydration tank.

[0015] For a further technical solution, the substances filled in the additive box are organic solvents or heavy metal chelating agents. The organic solvent is acetone or dichloromethane, and the heavy metal chelating agent is sodium diethyldithiocarbamate chelating agent or disodium ethylenediaminetetraacetate chelating agent.

[0016] An efficient urban sludge treatment device provided by the present invention has the following beneficial effects: The sludge is added into the inner side of the pretreatment cylinder through the sludge inlet pipe. The sludge is first centrifugally separated by the centrifugal stirring assembly, and then the flocculant is added to the inner side of the pretreatment cylinder by the flocculant adding assembly. With the cooperation of the centrifugal stirring assembly, the sludge and the flocculant can be mixed evenly. The sludge falling into the discharge pipe can be vibrated by the ultrasonic vibration assembly to break the microbial cell structure in the sludge and release the bound water, thereby improving the dehydration performance of the sludge as a whole.

[0017] The multi-stage dehydration assembly can perform conveyor gravity dehydration, mechanical pressure filtration dehydration and vacuum adsorption dehydration on the sludge discharged from the discharge pipe, that is, initially remove some free water under the action of gravity. The mechanical pressure filtration dehydration is combined with the vacuum adsorption dehydration, which can further compress the volume of the sludge and use negative pressure to adsorb the residual water in the sludge, so that the moisture content of the sludge is further reduced.

[0018] The treatment assembly can perform organic matter extraction or heavy metal stabilization treatment on the sludge conveyed by the multi-stage dehydration assembly, and finally discharge the treated sludge through the sludge discharge port. The extracted organic matter can be used to prepare bio-organic fertilizer or energy materials to realize the resource utilization of sludge. The heavy metal stabilization treatment can effectively reduce the environmental risk of subsequent disposal of sludge.

[0019] In summary, through the comprehensive action of centrifugal separation, flocculant mixing, ultrasonic vibration to break the microbial cell structure and release bound water, as well as multi-stage dehydration and treatment assembly, the present invention significantly improves the dehydration performance and resource utilization rate of sludge, and at the same time reduces the environmental risk of subsequent disposal. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the overall structure of the efficient urban sludge treatment device provided by the embodiment of the present invention; Figure 2 is Figure 1 a schematic diagram of the structure from another perspective; Figure 3 is an axonometric drawing of the efficient urban sludge treatment device provided by the embodiment of the present invention; Figure 4 is Figure 3 an enlarged schematic diagram of the pretreatment cylinder part in Figure 5 is a three-dimensional schematic diagram of the internal components of the pretreatment cylinder in the efficient urban sludge treatment device provided by the embodiment of the present invention; Figure 6 is Figure 3 an enlarged structural schematic diagram of the medium pressure filter seat part; Figure 7 is Figure 1 an enlarged structural schematic diagram of part A in it; Figure 8 is Figure 3 an enlarged structural schematic diagram of part B in it.

[0021] In the figure: 1 - bottom support, 2 - multi - stage dehydration tank, 3 - side support arm 1, 4 - end baffle, 5 - dehydration chamber, 6 - pretreatment cylinder, 7 - conveying pipe 1, 8 - feeding pump 1, 9 - support, 10 - flocculant tank, 11 - sludge inlet pipe, 12 - annular pipe, 13 - filter press push - pull cylinder, 14 - side support arm 2, 15 - filter press seat, 16 - sealing push - pull cylinder 1, 17 - motor 1, 18 - motor 2, 19 - mesh belt, 20 - side baffle, 21 - support pipe, 22 - conveying pipe 2, 23 - additive tank, 24 - bottom sealing plate, 25 - guide rail, 26 - sealing push - pull cylinder 2, 27 - drain port, 28 - driving roller, 29 - transmission shaft, 30 - filter press support plate, 31 - bottom support rod, 32 - scraping plate, 33 - treatment chamber, 34 - sludge discharge port, 35 - side sealing plate, 36 - material guiding port, 37 - stirring mesh plate, 38 - spray head, 39 - annular material guiding seat, 40 - centrifugal table, 41 - motor support rod, 42 - motor fixing sleeve, 43 - double - shaft motor, 44 - arc - shaped disturbance plate, 45 - mixing column 1, 46 - inclined plate, 47 - ultrasonic transducer, 48 - discharge pipe, 49 - ultrasonic vibration rod, 50 - suspension rod, 51 - mixing column 2, 52 - bottom mixing rod, 53 - negative pressure hole, 54 - negative pressure chamber, 55 - water outlet pipe, 56 - negative pressure device, 57 - additive discharge pipe. Specific embodiments

[0022] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present 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 only used to explain the present invention and are not used to limit the present invention.

[0023] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0024] As Figures 1-4 shown, a high - efficiency urban sludge treatment device provided by an embodiment of the present invention includes a multi - stage dehydration tank 2, the bottom of the multi - stage dehydration tank 2 is fixed with a bottom support 1, and further includes: Pretreatment cylinder 6, the pretreatment cylinder 6 is erected and fixed on the upper side of the multi-stage dewatering tank 2. A sludge inlet pipe 11 is provided at the top of the pretreatment cylinder 6, and a discharge pipe 48 is provided at the bottom of the pretreatment cylinder 6. 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 perform centrifugal separation on the sludge and mix the sludge with the flocculant; An ultrasonic vibration component is also installed on the discharge pipe 48, and the ultrasonic vibration component is used to destroy the microbial cell structure in the sludge and release the bound water; Multi-stage dewatering assembly, a dewatering cavity 5 is formed inside the multi-stage dewatering tank 2, and a multi-stage dewatering assembly is installed in the dewatering cavity 5. The multi-stage dewatering assembly is used to perform conveyor-type gravity dewatering, mechanical pressure filtration dewatering and vacuum adsorption dewatering on the sludge discharged from the discharge pipe 48; Treatment cavity 33, a treatment cavity 33 is further formed inside the multi-stage dewatering tank 2 on one side of the dewatering cavity 5, and a treatment assembly is installed in the treatment cavity 33. The treatment assembly is used to perform organic matter extraction or heavy metal stabilization treatment on the sludge conveyed by the multi-stage dewatering assembly; A sludge discharge port 34 communicating with the treatment cavity 33 is also provided at the bottom of the multi-stage dewatering tank 2.

[0025] In the embodiment of the present invention, the sludge is added into the inside of the pretreatment cylinder 6 through the sludge inlet pipe 11. The sludge is first centrifugally separated by the centrifugal stirring assembly, and then as the flocculant adding assembly adds flocculant to the inside of the pretreatment cylinder 6 and is combined with the centrifugal stirring assembly, the sludge and the flocculant can be mixed evenly. The sludge falling into the discharge pipe 48 can be used by the ultrasonic vibration component to destroy the microbial cell structure in the sludge and release the bound water, which overall improves the dewatering performance of the sludge.

[0026] The multi-stage dewatering assembly can perform conveyor-type gravity dewatering, mechanical pressure filtration dewatering and vacuum adsorption dewatering on the sludge discharged from the discharge pipe 48, that is, initially remove part of the free water under the action of gravity, and the mechanical pressure filtration dewatering is combined with the vacuum adsorption dewatering, which can further compress the volume of the sludge and use negative pressure to adsorb the residual water in the sludge, so that the moisture content of the sludge is further reduced (below 40%).

[0027] The treatment assembly can perform organic matter extraction or heavy metal stabilization treatment on the sludge conveyed by the multi-stage dewatering assembly, and finally discharge the treated sludge through the sludge discharge port 34. The extracted organic matter can be used to prepare bio-organic fertilizer or energy materials to realize the resource utilization of sludge, and the heavy metal stabilization treatment can effectively reduce the environmental risk of subsequent sludge disposal.

[0028] Such as Figures 1-5As shown, as a preferred embodiment of the present invention, a first side support arm 3 is fixed to the outside of the pretreatment cylinder 6, and the lower end of the first 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 both rounded to avoid material residue.

[0029] An annular material guiding seat 39 is integrally formed on the upper part of the inner side of the pretreatment cylinder 6. The inner circle of the annular material guiding seat 39 is inclined downward away from the inner side wall of the pretreatment cylinder 6, so that the annular material guiding seat 39 can be adapted to the centrifugal stirring assembly and the flocculant adding assembly.

[0030] The centrifugal stirring assembly includes a double-shaft motor 43 arranged in the middle of the inner side of the pretreatment cylinder 6. A motor fixing sleeve 42 is fixed to the outside of the double-shaft motor 43. A plurality of motor support rods 41 are circumferentially distributed and fixed to the outside of the motor fixing sleeve 42. The outer ends of the motor support rods 41 are fixedly connected to the inner side wall of the pretreatment cylinder 6. The upper output end of the double-shaft motor 43 is fixed with a centrifugal table 40. The centrifugal table 40 is a conical structure protruding upward in the middle, and the outer ring of the centrifugal table 40 is located above the lower surface of the annular material guiding seat 39, so that the annular material guiding seat 39 is adapted to the centrifugal table 40; a plurality of inclined plates 46 are circumferentially distributed and fixed on the lower output shaft of the double-shaft motor 43. A number of first mixing columns 45 are fixed to the upper side of the inclined plates 46. The outer ends of the inclined plates 46 are also fixed with an arc-shaped disturbing plate 44 that cooperates with the lower part of the inner side of the pretreatment cylinder 6. Centrifugation can be carried out by using the centrifugal table 40, and then the sludge slides down through the annular material guiding seat 39 and does not fall along the inner wall of the pretreatment cylinder 6, which is beneficial to subsequent flocculant mixing. Through the combination of the arc-shaped disturbing plate 44, the first mixing columns 45 and the inclined plates 46, the flocculant and the sludge can be fully mixed.

[0031] Preferably, the centrifugal stirring assembly further includes a suspension rod 50 fixed to the end of the lower output shaft of the double-shaft motor 43. A plurality of bottom mixing rods 52 are circumferentially distributed and fixed to the lower end of the suspension rod 50 corresponding to the arc-shaped disturbing plate 44. The bottom mixing rods 52 are horizontally arranged, and a number of second mixing columns 51 are horizontally fixed to both sides of the bottom mixing rods 52. Through the combination of the suspension rod 50, the second mixing columns 51 and the bottom mixing rods 52, the sludge flowing in and out of the feeding and discharging pipe 48 can be further stirred, and as the rotation speed of the double-shaft motor 43 increases, the second mixing columns 51 and the bottom mixing rods 52 also have the effect of delaying the outflow of the sludge, so that the flocculant and the sludge are fully mixed.

[0032] The flocculant addition component includes an annular pipe 12 fixed to the outside of the pretreatment cylinder 6. A plurality of spray heads 38 communicating with the annular pipe 12 are circumferentially distributed and fixed to the lower side of the annular material guiding 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 first feeding pump 8 is fixed to the lower side of the support 9. The inlet of the first feeding pump 8 communicates with the bottom of the inner cavity of the flocculant tank 10, and the outlet of the first feeding pump 8 communicates with the annular pipe 12 through a first conveying pipe 7. By transporting the flocculant through the first feeding pump 8, it can be distributed in the annular pipe 12 and finally sprayed out through the spray heads 38. Moreover, the annular material guiding seat 39 can block the spray heads 38 to prevent the sludge from affecting the spray heads 38. The sludge slipping from the annular material guiding seat 39 can fully react with the flocculant sprayed out by the spray heads 38, with high reliability. Among them, the flocculant filled in the flocculant tank 10 is polyacrylamide flocculant or polyaluminum chloride flocculant.

[0033] The ultrasonic vibration component includes multiple groups of ultrasonic vibration rods 49 longitudinally distributed and installed inside the discharge pipe 48. Three ultrasonic vibration rods 49 are circumferentially distributed in each group, and two longitudinally adjacent groups of ultrasonic vibration rods 49 are evenly staggered. An ultrasonic transducer 47 connected to the ultrasonic vibration rods 49 is also fixed to the bottom of the pretreatment cylinder 6. When the ultrasonic transducer 47 is turned on, the high-frequency vibration generated by the ultrasonic vibration rods 49 is transmitted to the flowing sludge, which has the effect of dispersing the sludge, destroying the microbial cell structure in the sludge, releasing the bound water, and improving the subsequent dehydration performance of the sludge.

[0034] As Figure 1 , 3, 6 and 7, as a preferred embodiment of the present invention, the multi-stage dehydration assembly includes a mesh belt 19 arranged in the dehydration chamber 5, which is made of 316L stainless steel, is corrosion-resistant and has a porosity of ≤0.1mm to ensure dehydration 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 the sludge without affecting the operation of the mesh belt 19; transmission rollers 28 are provided at both ends of the mesh belt 19, and a transmission shaft 29 is fixed to the middle of the transmission roller 28. Both ends of the transmission shaft 29 are rotatably connected to the side walls of the multi-stage dehydration box 2, and a motor 21 that is transmission-connected to one of the transmission shafts 29 is also fixed on the side walls of the multi-stage dehydration box 2. 8; A filter press support plate 30 is also provided at the lower side of the upper branch of the mesh belt 19, and a filter press seat 15 is provided at the upper side of the upper branch of the mesh belt 19 corresponding to the filter press support plate 30. A negative pressure cavity 54 is provided on the inner side of the filter press seat 15, and a plurality of negative pressure holes 53 connected with the negative pressure cavity 54 are provided 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 connected with the negative pressure cavity 54 is fixed to the top of the filter press seat 15, and 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 to the upper side of the filter press seat 15, and the cylinder body of the filter press push-pull cylinder 13 is fixedly connected to the side wall of the multi-stage dehydration box 2 through the side support arm 14. The mesh belt 19 can transport the sludge and dehydrate the sludge by gravity; when the sludge reaches the area where the filter press support plate 30 and the filter press seat 15 are located, the filter press seat 15 is driven down by the filter press push-pull cylinder 13, and the filter press seat 15 cooperates with the filter press support plate 30 to filter the sludge, and then the negative pressure device 56 is started for negative pressure suction to further dehydrate the sludge.

[0035] Preferably, a drain port 27 connected to the dehydration chamber 5 is provided at the bottom of the multi-stage dehydration box 2, and the water body is discharged through the drain port 27; 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 cooperated with an end baffle 4, the other end of the end baffle 4 is fixedly connected to the inner wall of the multi-stage dehydration box 2, and the end baffle 4 plays a role in blocking the sludge, so that the mesh belt 19 can reliably transport the sludge; a material guide port 36 is also provided on the multi-stage dehydration box 2 between the dehydration chamber 5 and the processing chamber 33, and a scraper plate 32 is obliquely fixed between the material guide port 36 and the end of the mesh belt 19, and limit plates (not shown) for limiting the sludge are also fixed on both sides of the scraper plate 32, and a bottom support rod 31 is also fixed on the lower side of the scraper plate 32, and the lower end of the bottom support rod 31 is fixed to the bottom of the dehydration chamber 5, which plays a role in stabilizing the scraper plate 32.

[0036] Preferably, a side sealing plate 35 capable of blocking the material guiding port 36 is slidably arranged on the side wall of the treatment chamber 33. A first sealing push-pull cylinder 16 is fixed on the upper side of the side sealing plate 35, and the cylinder body of the first sealing push-pull cylinder 16 is also fixedly connected to the multi-stage dehydration tank 2 at the top of the treatment chamber 33. By driving the side sealing plate 35 to lift and lower through the first sealing push-pull cylinder 16, the blocking control of the material guiding port 36 can be realized, so that the treatment chamber 33 can reliably treat the sludge.

[0037] Through the dehydration performance comparison experiment, by adopting the multi-stage dehydration assembly of the present invention, the moisture content after dehydration can be reduced to less than 40%, and the treatment time is shortened and the energy consumption is reduced.

[0038] As Figures 1-3 As shown in FIGS. 8, as a preferred embodiment of the present invention, the bottom of the treatment chamber 33 is of an arc-shaped structure. The treatment assembly includes a support pipe 21 rotatably installed in the middle of the upper part of the treatment chamber 33. A stirring mesh plate 37 matched with the treatment chamber 33 is fixed on the support pipe 21. Additive discharge pipes 57 communicated with the support pipe 21 are arranged on both sides of the stirring mesh plate 37. A first motor 17 drivingly connected to one end of the support pipe 21 is also fixed on the outer side of the multi-stage dehydration tank 2. The first motor 17 is used to drive the stirring mesh plate 37 to swing reciprocally. The other end of the support pipe 21 is rotatably communicated with a second conveying pipe 22. The other end of the second conveying pipe 22 extends to the inner lower part of the additive tank 23 and is connected to the outlet of a second feeding pump (not shown). The additive tank 23 is also fixedly connected to the outer wall of the multi-stage dehydration tank 2. When the first motor 17 drives the stirring mesh plate 37 to swing reciprocally, it does not affect the feeding of the additive to the support pipe 21 through the second conveying pipe 22, and the additive discharged through the additive discharge pipe 57 can act on the stirring mesh plate 37 to improve the mixing effect with the sludge.

[0039] The material filled in the additive tank 23 is an organic solvent (which can extract organic matter under the stirring condition of the stirring mesh plate 37). The organic solvent is acetone or dichloromethane. The extracted mixture is discharged through the sludge discharge port 34 and separated to obtain an organic matter-rich extract and solid-phase residue. In subsequent processes, the solid-phase 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 material filled in the additive tank 23 is a heavy metal chelating agent. The heavy metal chelating agent is sodium diethyldithiocarbamate chelating agent or ethylenediaminetetraacetic acid disodium chelating agent, which chelates with heavy metals in the sludge to form stable complexes and reduce the mobility and biological toxicity of heavy metals.

[0040] It should be noted that when the organic matter content in the sludge is relatively high, organic matter extraction can be selected; when the heavy metal content in the sludge is relatively high, heavy metal stabilization treatment can be selected. If both need to be carried out, it can be achieved by adding a reaction kettle, which will not be limited and elaborated here. The specific process is as follows: The treatment mode can be selected through the control panel (not shown) of the equipment. The system automatically switches the types of chemicals in the additive tank 23 (arranging two additive tanks 23 can freely switch to supply organic solvents or chelating agents), and adjusts the swing frequency of the stirring mesh plate 37.

[0041] Preferably, a bottom sealing plate 24 capable of blocking the sludge discharge port 34 is provided at the bottom of the multi-stage dehydration tank 2. Guide rails 25 are slidably provided on both sides of the bottom sealing plate 24, and the guide rails 25 are also fixedly connected to the bottom of the multi-stage dehydration tank 2 to ensure the strength of the bottom sealing plate 24. A second sealing push-pull cylinder 26 parallel to the guide rail 25 is fixed in the middle of the bottom sealing plate 24, and the cylinder body of the second sealing push-pull cylinder 26 is also fixedly connected to the bottom of the multi-stage dehydration tank 2. The movement of the bottom sealing plate 24 can be controlled by the second sealing push-pull cylinder 26.

[0042] In the above embodiment of the present invention, an efficient urban sludge treatment equipment is provided, and the working principle is as follows: The sludge is added into the pretreatment cylinder 6 through the sludge inlet pipe 11, and first undergoes centrifugal separation by the centrifugal stirring assembly. The flocculant adding assembly adds a flocculant (such as polyacrylamide or polyaluminum chloride) into the pretreatment cylinder 6 and works in coordination with the centrifugal stirring assembly to make the sludge and the flocculant fully mixed and uniform. The preliminarily treated sludge falls into the discharge pipe 48. During this process, the ultrasonic vibration assembly destroys the microbial cell structure in the sludge through high-frequency vibration, releases the bound water, and improves the subsequent dehydration efficiency.

[0043] The pretreated sludge enters the mesh belt 19 in the multi-stage dehydration tank 2 and is first preliminarily dehydrated by the action of gravity. Then, the sludge reaches the area of the filter pressing support plate 30 and the filter pressing seat 15, and the volume of the sludge is further compressed by mechanical filter pressing, and vacuum adsorption dehydration is carried out by using the negative pressure device 56 to remove the residual moisture, so that the moisture content of the sludge is reduced to less than 40%.

[0044] The dehydrated sludge enters the treatment chamber 33 through the material guiding port 36, and organic matter extraction or heavy metal stabilization treatment is selected according to the specific situation of the sludge. During the organic matter extraction process, the additive discharge pipe 57 conveys an organic solvent (such as acetone or dichloromethane) to be mixed with the sludge to 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 metal to reduce its mobility and biological toxicity.

[0045] In summary, through the comprehensive actions of centrifugal separation, flocculant mixing, ultrasonic vibration to break the microbial cell structure and release bound water, as well as multi-stage dehydration and treatment components, the present invention significantly improves the dewatering performance and resource utilization rate of sludge, while reducing the environmental risks of subsequent disposal.

[0046] The circuits, electronic components and modules involved are all prior arts and can be fully realized by those skilled in the art without further elaboration. The content protected by the present invention does not involve improvements to software and methods either.

[0047] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope recorded in this specification.

[0048] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. An efficient urban sludge treatment device, comprising a multi-stage dewatering box (2), wherein a bottom bracket (1) is fixed to the bottom of the multi-stage dewatering box (2), characterized in that: Also includes: A pretreatment barrel (6), wherein the pretreatment barrel (6) is mounted and fixed on the upper side of the multi-stage dehydration box (2), a sludge inlet pipe (11) is provided at the top of the pretreatment barrel (6), and a discharge pipe (48) is provided at the bottom of the pretreatment barrel (6); a centrifugal stirring assembly is installed on the inner side of the pretreatment barrel (6), and a flocculant adding assembly is also installed on the pretreatment barrel (6), the flocculant adding assembly is used to add flocculant to the inner side of the pretreatment barrel (6), and the centrifugal stirring assembly is used to centrifugally separate the sludge and mix the sludge and the flocculant; an ultrasonic vibration assembly is also installed on the discharge pipe (48), and the ultrasonic vibration assembly is used to destroy the microbial cell structure in the sludge and release bound water; A multi-stage dehydration component, wherein a dehydration chamber (5) is provided on the inner side of the multi-stage dehydration box (2), and the multi-stage dehydration component is installed in the dehydration chamber (5), and the multi-stage dehydration component is used to perform conveying gravity dehydration, mechanical filter pressing dehydration and vacuum adsorption dehydration on the sludge discharged from the discharge pipe (48); A processing chamber (33), wherein one side of the dehydration chamber (5) is further provided with a processing chamber (33) in the multi-stage dehydration box (2), wherein a processing component is installed in the processing chamber (33), and wherein the processing component is used to extract organic matter or perform heavy metal stabilization treatment on the sludge transported by the multi-stage dehydration component; and a sludge discharge port (34) communicating with the processing chamber (33) is also provided at the bottom of the multi-stage dehydration box (2).

2. The efficient urban sludge treatment equipment according to claim 1 is characterized in that: A side support arm 1 (3) is fixed to the outside of the pretreatment cylinder (6), and the lower end of the side support arm 1 (3) is fixedly connected to the side wall of the multi-stage dehydration box (2); The upper and lower inner portions of the pretreatment cylinder (6) are both rounded; An annular material guide seat (39) is also integrally formed on the inner upper portion of the pretreatment cylinder (6), and the inner ring of the annular material guide seat (39) is inclinedly arranged with its lower portion away from the inner wall of the pretreatment cylinder (6).

3. The efficient urban sludge treatment equipment according to claim 2 is characterized in that: The centrifugal stirring assembly comprises a double-shaft motor (43) disposed 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 double-shaft motor (43); a plurality of motor support rods (41) are fixedly distributed circumferentially on the outer side of the motor fixing sleeve (42); and the outer ends of the motor support rods (41) are fixedly connected to the inner side wall of the pretreatment cylinder (6); A centrifugal table (40) is fixed to the upper output end of the dual-axis motor (43); the centrifugal table (40) is a conical 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 material guide seat (39); A plurality of inclined plates (46) are fixed circumferentially distributed on the lower output shaft of the dual-axis motor (43), a plurality of mixing columns (45) are fixed on the upper side of the inclined plates (46), and an arc-shaped disturbance plate (44) matching the inner lower part of the pretreatment cylinder (6) is also fixed on the outer end of the inclined plates (46); The centrifugal stirring assembly further comprises a suspension rod (50) fixed to the lower output shaft end of the dual-shaft motor (43); a plurality of bottom mixing rods (52) are fixed to the lower end of the suspension rod (50) in a circumferentially distributed manner corresponding to the arc-shaped disturbance plate (44); the bottom mixing rods (52) are arranged horizontally, and a plurality of mixing columns (51) are also fixed horizontally on both sides of the bottom mixing rods (52).

4. The efficient urban sludge treatment equipment according to claim 3 is characterized in that: The flocculant addition assembly comprises an annular tube (12) fixed to the outside of the pretreatment cylinder (6), and a plurality of nozzles (38) in communication with the annular tube (12) are fixed and distributed circumferentially on the lower side of the annular material guide seat (39); A support (9) is also fixed on the outside of the pretreatment cylinder (6), a flocculant box (10) is fixed on the upper side of the support (9), and 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 box (10), and the outlet of the feed pump (8) is connected to the annular tube (12) through the delivery pipe (7).

5. The efficient urban sludge treatment equipment according to claim 4 is characterized in that: The ultrasonic vibration assembly comprises a plurality of groups of ultrasonic vibration rods (49) installed inside the discharge pipe (48) and distributed longitudinally, each group of ultrasonic vibration rods (49) being provided with three circumferentially distributed ones, and two groups of ultrasonic vibration rods (49) adjacent to each other in the longitudinal direction being evenly staggered; An ultrasonic transducer (47) connected to an ultrasonic vibration rod (49) is also fixed to the bottom of the pretreatment cylinder (6).

6. The efficient urban sludge treatment equipment according to any one of claims 1 to 5, characterized in that: The multi-stage dehydration assembly comprises a mesh belt (19) arranged in the dehydration chamber (5), and side baffles (20) are fixed on both sides of the mesh belt (19); Transmission rollers (28) are provided at both ends of the mesh belt (19), a transmission shaft (29) is fixed in the middle of the transmission roller (28), both ends of the transmission shaft (29) are rotatably connected to the side walls of the multi-stage dehydration box (2), and a second motor (18) which is transmission-connected to one of the transmission shafts (29) is also fixed on the side wall of the multi-stage dehydration box (2); The lower side of the upper branch of the mesh belt (19) is also provided with a filter press support plate (30), and the upper side of the upper branch of the mesh belt (19) is provided with a filter press seat (15) corresponding to the filter press support plate (30), a negative pressure cavity (54) is provided on the inner side of the filter press seat (15), and a plurality of negative pressure holes (53) in communication with the negative pressure cavity (54) are provided at the bottom of the filter press seat (15), and a one-way valve is installed on the negative pressure hole (53); A negative pressure device (56) in communication with the negative pressure chamber (54) is fixed on the top of the filter press seat (15), and 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), and the cylinder body of the filter press push-pull cylinder (13) is fixedly connected to the side wall of the multi-stage dehydration box (2) through a second side support arm (14).

7. The efficient urban sludge treatment equipment according to claim 6 is characterized in that: The bottom of the multi-stage dehydration box (2) is provided with a drainage port (27) which is in communication 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 dehydration box (2); A material guide port (36) is also provided on the multi-stage dewatering box (2) between the dewatering chamber (5) and the processing chamber (33). A scraper plate (32) is obliquely fixed between the material guide port (36) and the end of the mesh belt (19). Limiting plates for limiting the position of 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).

8. The efficient urban sludge treatment equipment according to claim 7 is characterized in that: A side sealing plate (35) capable of sealing the material guide port (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); and the cylinder body of the sealing push-pull cylinder (16) is also fixedly connected to the multi-stage dehydration box (2) at the top of the processing chamber (33); The bottom of the multi-stage dewatering box (2) is provided with a bottom sealing plate (24) capable of sealing the sludge discharge port (34), guide rails (25) are slidably provided on both sides of the bottom sealing plate (24), and the guide rails (25) are also fixedly connected to the bottom of the multi-stage dewatering box (2), and a sealing push-pull cylinder (26) parallel to the guide rails (25) is fixed to the middle of the bottom sealing plate (24), and the cylinder body of the sealing push-pull cylinder (26) is also fixedly connected to the bottom of the multi-stage dewatering box (2).

9. The efficient urban sludge treatment equipment according to any one of claims 1 to 5, characterized in that: The bottom of the processing chamber (33) is an arc-shaped structure, and the processing assembly comprises a support tube (21) rotatably mounted in the middle of the upper part of the processing chamber (33), a stirring screen plate (37) matched with the processing chamber (33) is fixed on the support tube (21), and additive discharge pipes (57) connected with the support tube (21) are provided on both sides of the stirring screen plate (37); A motor 1 (17) is also fixed on the outside of the multi-stage dehydration box (2) and is transmission-connected to one end of the support tube (21). The motor 1 (17) is used to drive the stirring screen (37) to swing back and forth. The other end of the support tube (21) is rotatably connected to a delivery tube 2 (22). The other end of the delivery tube 2 (22) extends to the lower inner part of the additive box (23) and is connected to the outlet of the feed pump 2. The additive box (23) is also fixedly connected to the outer wall of the multi-stage dehydration box (2).

10. The efficient urban sludge treatment equipment according to claim 9, characterized in that: The substance filled in the additive box (23) is an organic solvent or a heavy metal chelating agent, the organic solvent is acetone or dichloromethane, and the heavy metal chelating agent is a sodium diethyldithiocarbamate chelating agent or a disodium ethylenediaminetetraacetic acid chelating agent.

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