Electrocoagulation pretreatment sludge high-efficiency concentration device

Abstract

The utility model discloses a kind of sludge high-efficiency concentration devices of electroflocculation pretreatment, including support frame, the both sides of the inside of support frame are rotatably connected with rotating shaft, the inside of support frame is provided with concentration tank. The utility model adopts the synergic cooperation of support frame, rotating shaft, spheroidal concentration tank, driving mechanism, scraping ring, spiral conveying blade and lower layer stirring frame, spheroidal concentration tank can provide more reasonable space for sludge and reagent mixing, reduce dead angle;Scraping ring adheres to tank inner wall can avoid sludge adhesion accumulation, guarantee effective volume in tank;Spiral conveying blade is auxiliary to push sludge when discharging, cooperate discharge pipe and discharge valve, effectively solve the problem of poor discharge;Lower layer stirring frame promotes sludge and reagent to contact fully, improves flocculation formation efficiency, and then improves concentration effect, give consideration to concentration efficiency and discharge convenience, the device has the advantages of high concentration efficiency and convenient discharge.

Description

Technical Field

[0001] This utility model relates to the field of high-efficiency sludge thickening technology, specifically a high-efficiency sludge thickening device for electrocoagulation pretreatment. Background Technology

[0002] Electrocoagulation technology, due to its advantages such as requiring no large amounts of chemical reagents and producing highly stable flocs, has been widely used in the sludge pretreatment stage of wastewater treatment. The pretreated sludge needs to be thickened to reduce its moisture content, creating conditions for subsequent dewatering and resource utilization. Therefore, the operational performance of the sludge thickening device directly affects the efficiency and cost of the overall sludge treatment process. However, currently available electrocoagulation pretreatment sludge thickening devices still suffer from two major shortcomings in practical applications, failing to meet the demands for both high-efficiency treatment and convenient operation.

[0003] I. Regarding concentration efficiency, existing devices generally suffer from insufficient mixing and low settling efficiency. Most devices use traditional cylindrical tanks, which easily create dead zones for fluid mixing, making it difficult for electrocoagulated sludge and coagulant to make uniform contact throughout the entire area. At the same time, the stirring mechanism is relatively simple in design, mostly a single-layer stirring rack, which easily leads to uneven distribution of reagents due to insufficient stirring. Ultimately, this results in low utilization of coagulant, slow floc formation speed and uneven particle size, low sludge settling efficiency, and the overall concentration efficiency is far from meeting the needs of large-scale treatment.

[0004] Second, regarding the convenience of discharge, the existing equipment's structural design also has significant shortcomings. On the one hand, the inner wall of the tank lacks an effective anti-adhesion and cleaning structure, making it easy for sludge to adhere to the tank wall surface during the concentration process. Long-term accumulation not only gradually reduces the effective volume of the tank but also leaves a large amount of sludge after discharge, requiring manual entry into the tank or cleaning with a high-pressure water gun, which is cumbersome and time-consuming. On the other hand, the discharge system relies solely on a simple combination of discharge pipes and valves, lacking auxiliary pushing components. When the concentration of concentrated sludge is high, blockages easily occur in the discharge pipes, causing interruptions in the discharge process. This requires manual disassembly and cleaning of the pipes, increasing the labor intensity of operators and extending the processing cycle, severely affecting discharge efficiency and the continuous operation capability of the equipment.

[0005] In summary, the current deficiencies in concentration efficiency and discharge convenience of electrocoagulation pretreatment sludge thickening devices have become key factors restricting the efficient advancement of sludge treatment processes. Therefore, it is urgent to redesign and modify the existing devices to effectively solve the above problems. Utility Model Content

[0006] To address the problems mentioned in the background art, the purpose of this utility model is to provide a high-efficiency sludge thickening device for electrocoagulation pretreatment, which has the advantages of high thickening efficiency and easy discharge.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency sludge thickening device for electrocoagulation pretreatment, comprising a support frame, with rotating shafts rotatably connected to both sides inside the support frame, a thickening tank disposed inside the support frame, and the adjacent sides of the two rotating shafts being fixedly connected to the thickening tank, a driving mechanism disposed on the right side of the support frame, a feed pipe and a dosing pipe respectively connected to the top of the thickening tank, a discharge pipe connected to the bottom of the thickening tank, a discharge valve connected to the bottom of the discharge pipe, a scraper ring rotatably connected inside the thickening tank, the thickening tank being spherical, the surface of the scraper ring fitting against the inner wall of the thickening tank, a spiral conveying blade fixedly connected to the bottom of the scraper ring, the spiral conveying blade being located inside the discharge pipe, and a lower stirring frame fixedly connected to the lower part of the inner wall of the scraper ring.

[0008] As a preferred embodiment of this invention, an upper stirring frame is fixedly connected to the upper part of the inner wall of the scraper ring, and the upper stirring frame is fixedly connected to the lower stirring frame.

[0009] In a preferred embodiment of this invention, a first motor is fixedly connected to the top of the concentration tank via a connector, and the output end of the first motor is fixedly connected to the scraper ring.

[0010] In a preferred embodiment of this invention, the driving mechanism includes a sector plate fixedly connected to the right side of the right rotating shaft, teeth fixedly connected to the surface of the sector plate, a servo motor fixedly connected to the right side of the support frame via a bracket, and a gear fixedly connected to the output end of the servo motor, the gear meshing with the teeth.

[0011] As a preferred embodiment of this utility model, a protective cover is fixedly connected to the right side of the support frame, and the sector plate, gear and teeth are all located inside the protective cover.

[0012] As a preferred embodiment of this utility model, both the feed pipe and the dosing pipe are threaded with sealing caps, and a collection drawer is provided at the bottom of the inner wall of the support frame, the collection drawer being located below the discharge valve.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model employs a support frame, rotating shaft, spherical thickening tank, drive mechanism, scraper ring, spiral conveyor blades, and lower stirring frame in synergistic cooperation. The spherical thickening tank provides a more reasonable space for mixing sludge and chemicals, reducing dead corners; the scraper ring, adhering to the inner wall of the tank, prevents sludge from adhering and accumulating, ensuring the effective volume inside the tank; the spiral conveyor blades assist in pushing the sludge during discharge, and together with the discharge pipe and discharge valve, effectively solve the problem of poor discharge; the lower stirring frame promotes full contact between sludge and chemicals, improves floc formation efficiency, and thus improves the thickening effect, balancing thickening efficiency and discharge convenience. This device has the advantages of high thickening efficiency and convenient discharge.

[0015] 2. This utility model uses an upper and lower stirring rack fixedly connected to form a vertically linked stirring structure, which can fully stir sludge at different heights in the concentration tank. The upper stirring rack acts on the upper sludge in the tank, preventing uneven mixing of the reagent due to insufficient stirring of the upper sludge; the lower stirring rack enhances the stirring effect of the lower sludge. The cooperation between the upper and lower racks ensures uniform contact between the sludge and the reagent throughout the tank, promoting uniform floc growth and accelerating sedimentation, further improving the concentration efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a front sectional view of the concentration tank structure of this utility model;

[0018] Figure 3 This is a schematic diagram of the scraper ring structure of this utility model;

[0019] Figure 4 This utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0020] In the diagram: 1. Support frame; 2. Rotating shaft; 3. Concentrator; 4. Feed pipe; 5. Dosing pipe; 6. Discharge pipe; 7. Discharge valve; 8. Scraper ring; 9. Lower mixing rack; 10. Upper mixing rack; 11. First motor; 12. Spiral conveyor blades; 13. Sector plate; 14. Tooth; 15. Servo motor; 16. Gear; 17. Protective cover; 18. Sealing cover; 19. Collection drawer. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 4 As shown, a high-efficiency sludge thickening device for electrocoagulation pretreatment includes a support frame 1. Rotating shafts 2 are rotatably connected to both sides of the support frame 1. A thickening tank 3 is disposed inside the support frame 1. The adjacent sides of the two rotating shafts 2 are fixedly connected to the thickening tank 3. A drive mechanism is disposed on the right side of the support frame 1. A feed pipe 4 and a dosing pipe 5 are respectively connected to the top of the thickening tank 3. A discharge pipe 6 is connected to the bottom of the thickening tank 3, and a discharge valve 7 is connected to the bottom of the discharge pipe 6. A scraper ring 8 is rotatably connected inside the thickening tank 3. The thickening tank 3 is spherical. The surface of the scraper ring 8 is in contact with the inner wall of the thickening tank 3. A spiral conveying blade 12 is fixedly connected to the bottom of the scraper ring 8. The spiral conveying blade 12 is located inside the discharge pipe 6. A lower stirring frame 9 is fixedly connected to the lower part of the inner wall of the scraper ring 8. A controller is fixedly connected to the left side of the support frame 1 to control the start and stop of various electrical appliances in the device. The drive mechanism can drive the rotating shaft 2 and the thickening tank 3 to rotate back and forth at a 45-degree angle, which can improve the mixing effect of the coagulant aid and the sludge after electrocoagulation pretreatment. After the addition of the coagulant for a period of time, the flocs form larger and more stable aggregates through the strengthening effect of the coagulant, and mainly settle to the bottom of the inside of the concentration tank 3. The upper layer is the supernatant. The operator can open the sealing cover 18 on the surface of the feed pipe 4, and then pump out the supernatant through the pumping pipe connected to the external pumping equipment. Then, the sludge is discharged through the discharge valve 7. The first motor 11 rotates at a uniform and slow speed, so that it can promote the contact between the flocs and the coagulant without damaging the integrity of the flocs. The standard parts used in this utility model can all be purchased from the market, and the irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification are the prior art known to those skilled in the art, and this application will not describe them in detail.

[0023] refer to Figure 3 An upper mixing rack 10 is fixedly connected to the upper part of the inner wall of the scraper ring 8, and the upper mixing rack 10 is fixedly connected to the lower mixing rack 9.

[0024] As a technical optimization of this utility model, the upper stirring rack 10 and the lower stirring rack 9 are fixedly connected to form an upper and lower linkage stirring structure, which can fully stir the sludge at different heights in the concentration tank 3. The upper stirring rack 10 can act on the upper sludge in the tank, avoiding uneven mixing of the agent due to insufficient stirring of the upper sludge; the lower stirring rack 9 enhances the stirring effect of the lower sludge. The upper and lower racks work together to ensure that the sludge and the agent are in uniform contact throughout the tank, promoting uniform growth of flocs and accelerating sedimentation, further improving the concentration efficiency. The upper sludge in the concentration tank 3 is less than the lower sludge, so the stirring area of ​​the upper stirring rack 10 is smaller than the stirring area of ​​the lower stirring rack 9. The upper layer is the supernatant collection area, and the lower layer is the sludge layer.

[0025] refer to Figure 2 The top of the concentration tank 3 is fixedly connected to the first motor 11 via a connector, and the output end of the first motor 11 is fixedly connected to the scraper ring 8.

[0026] As a technical optimization of this utility model, the first motor 11 is fixedly connected to the scraper ring 8, providing stable power for the rotation of the scraper ring 8. This ensures that the scraper ring 8 continuously adheres to the inner wall of the concentration tank 3 for scraping operations, avoiding the tediousness and untimely nature of manual scraping. At the same time, the motor drives the scraper ring 8 to drive the lower stirring rack 9 and the upper stirring rack 10 to rotate synchronously, ensuring coordinated and unified stirring and scraping actions, and maintaining stable concentration and discharge effects.

[0027] refer to Figure 2 The drive mechanism includes a sector plate 13 fixedly connected to the right side of the right rotating shaft 2. The surface of the sector plate 13 is fixedly connected with teeth 14. The right side of the support frame 1 is fixedly connected to a servo motor 15 via a bracket. The output end of the servo motor 15 is fixedly connected to a gear 16, which meshes with the teeth 14.

[0028] As a technical optimization of this utility model, the servo motor 15 in the drive mechanism meshes with the teeth 14 on the sector plate 13 via the gear 16, driving the rotating shaft 2 and the concentration tank 3 to rotate, allowing for flexible adjustment of the tilt angle of the concentration tank 3. This rotation causes the sludge inside the tank to agitate under the influence of gravity and inertia, enhancing the contact frequency and intensity between the sludge and the reagent, and avoiding the problem of insufficient local mixing. Compared to a fixed tank, this promotes more uniform floc formation and accelerates sedimentation, improving the overall concentration efficiency.

[0029] refer to Figure 2 A protective cover 17 is fixedly connected to the right side of the support frame 1. The sector plate 13, gear 16 and teeth 14 are all located inside the protective cover 17.

[0030] As a technical optimization of this utility model, the sector plate 13, gear 16 and teeth 14 are wrapped in a protective cover 17. The protective cover 17 can prevent operators from accidentally contacting the rotating parts, reduce safety hazards, ensure that the device operates continuously in a stable and safe environment, and reduce maintenance costs.

[0031] refer to Figure 1 Both the feed pipe 4 and the dosing pipe 5 are threaded with sealing caps 18. A collection drawer 19 is provided at the bottom of the inner wall of the support frame 1, and the collection drawer 19 is located below the discharge valve 7.

[0032] As a technical optimization of this utility model, the sealing caps 18 on the surfaces of the feed pipe 4 and the dosing pipe 5 can seal the pipe openings when the device is not feeding or adding chemicals, preventing odors from leaking out of the tank and external impurities from falling into the tank, thus ensuring the cleanliness and safety of the sludge treatment environment. The collection drawer 19 at the bottom of the support frame 1 can collect the discharged sludge.

[0033] The working principle and usage process of this utility model: When using this high-efficiency sludge thickening device for electrocoagulation pretreatment, first check the status of each component of the device to ensure that the support frame 1 is placed stably, the thickening tank 3 is undamaged, the discharge valve 7 is closed, the sealing caps 18 on the surface of the feed pipe 4 and the dosing pipe 5 are tightened, the collection drawer 19 is correctly installed at the bottom of the inner wall of the support frame 1 and is in an empty state, and at the same time confirm that the controller is connected normally and that there are no abnormalities in the electrical circuits.

[0034] Then unscrew the sealing caps 18 on the surface of the feed pipe 4 and the dosing pipe 5, connect the external pipeline for transporting the pretreated sludge after electrocoagulation to the feed pipe 4, and connect the pipeline for storing the coagulant aid to the dosing pipe 5, ensuring that the connection is sealed and leak-free. Next, the controller turns on the relevant control switches for feeding and dosing, allowing the sludge to enter the spherical thickener 3 through the feed pipe 4. The coagulant is injected into the thickener 3 simultaneously through the dosing pipe 5. After injecting an appropriate amount of material and agent, the dosing and sludge addition are stopped. Then, the sealing cap 18 is tightened, and the controller starts the first motor 11. The output of the first motor 11 drives the scraper ring 8 to rotate inside the thickener 3. When the scraper ring 8 rotates, its surface adheres to the inner wall of the thickener 3 to perform scraping operations, preventing the sludge from adhering to the tank wall. At the same time, the scraper ring 8 drives the lower stirring frame 9 below the inner wall and the upper stirring frame 10 fixedly connected to the lower stirring frame 9 to rotate synchronously. The upper stirring frame 10 stirs the sludge and agent in the upper area of ​​the thickener 3, and the lower stirring frame 9 stirs the sludge and agent in the lower area, so as to achieve full mixing of sludge and coagulant throughout the tank. Then, the drive mechanism is started by the controller. The servo motor 15 in the drive mechanism starts to work. The output end of the servo motor 15 drives the gear 16 to rotate. The gear 16 meshes with the teeth 14 on the surface of the fan-shaped plate 13 fixed on the right side of the right rotating shaft 2, thereby driving the rotating shaft 2 to rotate. The rotating shaft 2 drives the thickening tank 3 to rotate back and forth at a 45-degree angle inside the support frame 1, adjusting the tilt angle of the thickening tank 3, so that the sludge in the tank is further turned over under the action of gravity and inertia, enhancing the mixing effect, promoting floc formation and accelerating sedimentation.

[0035] After the flocs in the concentration tank 3 have settled sufficiently, a supernatant is formed on the upper layer. The rotation of the first motor 11 is stopped. At this time, the sealing cover 18 on the surface of the feed pipe 4 is opened, and the pumping pipe of the external pumping equipment is inserted into the concentration tank 3. The supernatant is then pumped out through the feed pipe 4 by the pumping equipment. After the supernatant has been completely pumped out, the discharge valve 7 is opened by the controller, and the first motor 11 is started to drive the spiral conveyor blades 12 to rotate. The spiral conveyor blades 12 push the settled sludge in the discharge pipe 6 and discharge valve 7 to be discharged. The discharged sludge falls into the collection drawer 19 below. The rotation of the scraper ring 8 will prevent the sludge from adhering to the inner wall of the concentration tank 3. After the sludge in the concentration tank 3 is discharged, the first motor 11 and discharge valve 7 are closed by the controller, and the collection drawer 19 is pulled out to process the sludge inside.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electrocoagulation pretreated sludge high concentration device, comprising a support frame (1), characterized in that: The support frame (1) has rotating shafts (2) rotatably connected to both sides inside. The support frame (1) has a concentration tank (3) inside. The two rotating shafts (2) are fixedly connected to the concentration tank (3) on their adjacent sides. The support frame (1) has a drive mechanism on its right side. The top of the concentration tank (3) is connected to a feed pipe (4) and a dosing pipe (5). The bottom of the concentration tank (3) is connected to a discharge pipe (6). The bottom of the discharge pipe (6) is connected to a discharge valve (7). The concentration tank (3) has a scraper ring (8) rotatably connected inside. The concentration tank (3) is spherical. The surface of the scraper ring (8) is in contact with the inner wall of the concentration tank (3). The bottom of the scraper ring (8) is fixedly connected to a spiral conveying blade (12). The spiral conveying blade (12) is located inside the discharge pipe (6). The lower layer of the stirring rack (9) is fixedly connected to the lower part of the inner wall of the scraper ring (8).

2. An electrocoagulation pretreated sludge high-efficiency concentration device according to claim 1, characterized in that: An upper stirring rack (10) is fixedly connected to the upper part of the inner wall of the scraper ring (8), and the upper stirring rack (10) is fixedly connected to the lower stirring rack (9).

3. An electrocoagulation pretreated sludge high concentration device according to claim 2, characterized in that: The top of the concentration tank (3) is fixedly connected to a first motor (11) via a connector, and the output end of the first motor (11) is fixedly connected to the scraper ring (8).

4. An electrocoagulation pretreated sludge high concentration device according to claim 3, characterized in that: The drive mechanism includes a sector plate (13) fixedly connected to the right side of the right rotating shaft (2), and teeth (14) fixedly connected to the surface of the sector plate (13). A servo motor (15) is fixedly connected to the right side of the support frame (1) via a bracket. A gear (16) is fixedly connected to the output end of the servo motor (15), and the gear (16) meshes with the teeth (14).

5. An electrocoagulation pretreated sludge high concentration device according to claim 4, characterized in that: A protective cover (17) is fixedly connected to the right side of the support frame (1), and the sector plate (13), gear (16) and teeth (14) are all located inside the protective cover (17).

6. An electrocoagulation pretreated sludge high concentration device according to claim 5, characterized in that: The surfaces of the feed pipe (4) and the dosing pipe (5) are threaded with sealing caps (18), and a collection drawer (19) is provided at the bottom of the inner wall of the support frame (1). The collection drawer (19) is located below the discharge valve (7).

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