Integrated efficient sedimentation tank

Abstract

The utility model belongs to the field of wastewater treatment, in particular relates to an integrated high-efficiency sedimentation tank, and aims to solve the problem that an effective control means is lacked in the aspect of sludge backflow control in the prior art. The difficult-to-avoid liquid flow impacts the sludge at the bottom, so that the sludge is suspended again; in order to solve the problem that sludge is greatly impacted by liquid flow when equipment is shut down and restarted, the utility model provides the following scheme: the sludge treatment tank comprises a tank body, a water outlet is formed in the top of the outer wall of the tank body, and an emptying port, a sludge discharge port and a manhole are respectively formed in the bottom of the outer wall of the tank body; the outer cylinder is fixedly arranged above the center in the tank body, and the inner cylinder is fixedly arranged in the center in the outer cylinder, so that the impact of liquid flow on sludge at the bottom is avoided, the radial flowing kinetic energy of the liquid flow is slowed down, the liquid flow can reach an ideal state similar to laminar flow, and the impact of the liquid flow on a sludge area can be reduced in the process of equipment shutdown and restart; sludge gradually flows back to the reaction area of the inner cylinder, so that the discharged water quickly reaches the standard.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an integrated high-efficiency sedimentation tank. Background Technology

[0002] In the field of wastewater treatment and water purification, sedimentation tanks are key equipment in the entire treatment process and shoulder a vital mission. They undertake the core task of removing suspended solids and particulate matter from water and achieving solid-liquid separation. They are an important link in ensuring that water quality meets discharge standards and that subsequent treatment processes operate stably.

[0003] However, existing wastewater treatment equipment has shortcomings in several aspects:

[0004] 1. There is a lack of effective control measures for sludge recirculation; 2. It is difficult to avoid the impact of liquid flow on the bottom sludge, which will cause the sludge to be resuspended; 3. When the equipment is stopped and restarted, the liquid flow will cause a large impact on the sludge. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the lack of effective control methods for sludge recirculation, the difficulty in preventing liquid flow from impacting the bottom sludge and causing it to resuspend, and the significant impact of liquid flow on the sludge during equipment shutdown and restart. The proposed invention is an integrated high-efficiency sedimentation tank.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An integrated high-efficiency sedimentation tank includes a tank body, with an outlet at the top of the outer wall of the tank body and an air drain, a sludge discharge outlet, and a manhole at the bottom of the outer wall of the tank body.

[0008] The outer cylinder and the inner cylinder are fixedly set above the center of the pool body. The inner cylinder is fixedly set inside the center of the outer cylinder. A throat is set at the bottom of the inner cylinder. The throat is shaped like a trumpet with its opening facing downward. Its top end is necked upward and then expanded in diameter and fixedly connected to the bottom end of the inner cylinder.

[0009] The integrated machine consists of a sludge scraping mechanism and a mixer. The sludge scraping mechanism includes a sludge scraper, and the rotating shaft of the sludge scraper extends through the inner cylinder to the outside of the tank for installation and drive. The mixer and the sludge scraper use the same rotating shaft.

[0010] The dosing pipe and the water inlet pipe are used to inject chemicals and water into the inner cylinder, respectively. One end of the dosing pipe and the water inlet pipe are fixedly connected to the inner cylinder through the tank body and the outer cylinder. The dosing pipe and the water inlet pipe are arranged from top to bottom and are both located above the throat pipe.

[0011] The inclined tube zone is used to shorten the settling distance and increase the sedimentation area. The inclined tube zone is set inside the tank and is located between the outlet and the dosing pipe. The inclined tube zone is composed of multiple inclined tubes connected at an inclined angle.

[0012] In one possible design, the included angle between the flared end panels on both sides of the throat is 120 degrees.

[0013] In one possible design, the outer cylinder is cylindrical with its top end above the liquid surface to prevent water from flowing over the top of the inner cylinder to the outlet liquid surface, while the upper edge of the inner cylinder is below the liquid surface.

[0014] In one possible design, the area above the inclined tube zone is the clear water zone, and the area below the inclined tube zone is the buffer zone.

[0015] In one possible design, the sludge scraping mechanism includes a main frame and multiple scrapers fixedly mounted at the bottom of the main frame. Scraper strips are inserted into the bottom of the scrapers. Multiple inner cavities are formed inside the scrapers, and fixed rods are slidably mounted inside each cavity. Multiple fixed grooves are formed at the top of the scraper strips. Both sides of the bottom end of the fixed rod are beveled, with the bottom end located inside the fixed groove. A compression spring is installed inside each cavity, with its two ends fixedly mounted on one side of the inner wall of the cavity and one end of the fixed rod, respectively. A rotating rod is rotatably mounted inside the scrapers. Multiple arc-shaped plates are fixedly mounted on the outer wall of the rotating rod. An arc-shaped groove is formed on the outer wall of the fixed rod, with one end of each arc-shaped plate penetrating into the inner cavity and engaging with the arc-shaped groove. A torsion spring is installed at the rotation point of the rotating rod.

[0016] In this application, during actual use, the integrated machine drives the water to flow upwards, mixing with the chemicals entering through the dosing pipe, resulting in a flocculation reaction. Simultaneously, the sludge deposited at the bottom of the throat flows upwards under the action of the integrated machine, entering the throat and mixing with the incoming water, increasing the sludge concentration in the inner cylinder reaction zone. After the high-concentration sludge from the flocculation reaction crosses the upper edge of the inner cylinder, it flows downwards along the area between the outer and inner cylinders. Upon reaching the upper edge of the throat, the fluid velocity decreases due to the sudden increase in the flow cross-section, and the liquid flow slightly turns inwards. Upon reaching the steel plate at the lower end of the throat, the liquid velocity further decreases due to the obstruction and reflection effect of the steel plate, thus facilitating solid-liquid separation in the buffer zone below the inclined tube area, enhancing the sedimentation effect, and preventing the liquid flow from disturbing the already settled sludge at the bottom of the tank. Under the influence of the internal and external liquid level difference, the liquid between the outer cylinder and the tank gradually flows towards the inclined tube area and is discharged after passing through the inclined tube area.

[0017] The area formed by the cross-section where the lower edge of the outer cylinder is located and the cross-section where the lower edge of the inclined tube region is located (see attached) Figure 2In the "buffer zone", due to the function of the throat, there is almost no horizontal flow of liquid during the upward flow of water. The liquid flow in the buffer zone is only upward, which can form a stable suspended sludge layer in the buffer zone. The shallow pool sedimentation function of the inclined tube zone can be maximized, resulting in low turbidity of the effluent.

[0018] In this utility model, the integrated high-efficiency sedimentation tank can be easily controlled by the integrated machine to increase the water flow through the throat pipe. Moreover, the area covered by the flared mouth at the lower end of the throat pipe is exactly the area where the sludge scraper scrapes the sludge towards the center, which is conducive to sludge return.

[0019] In this utility model, the integrated high-efficiency sedimentation tank, through the setting of the flared mouth, can avoid the impact of the liquid flow between the inner and outer cylinders on the bottom sludge during the downward flow, and at the same time reduce the kinetic energy of the radial flow of the liquid, which is conducive to the stable liquid flow in the buffer zone below the inclined tube area flowing under the potential energy of the liquid level difference between the inner and outer cylinder walls, achieving an ideal state of near laminar flow.

[0020] In this invention, the unique structure of the throat and flared mouth enables convenient control of sludge return during use, avoids the impact of liquid flow on the bottom sludge, reduces the radial flow kinetic energy of the liquid flow, and helps the liquid flow to reach an ideal state of near laminar flow. During equipment shutdown and restart, it can also reduce the impact of liquid flow on the sludge zone, allowing the sludge to gradually return to the inner cylinder reaction zone, thus achieving rapid effluent compliance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the planar structure of the integrated high-efficiency sedimentation tank proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the planar structure of the integrated high-efficiency sedimentation tank area proposed in this utility model;

[0023] Figure 3 This is a three-dimensional structural diagram of the integrated high-efficiency sedimentation tank sludge scraping mechanism proposed in this utility model;

[0024] Figure 4 This is a cross-sectional structural diagram of the integrated high-efficiency sedimentation tank sludge scraping mechanism proposed in this utility model.

[0025] In the diagram: 1. Pool body; 2. Outlet; 3. Inclined tube area; 4. Dosing pipe; 5. Inlet pipe; 6. Outer cylinder; 7. Rectifier plate; 8. Throat pipe; 9. Integrated unit; 10. Inner cylinder; 11. Drain port; 12. Sludge discharge port; 13. Manhole; 14. Main frame; 15. Scraper; 16. Scraper strip; 17. Fixing rod; 18. Fixing groove; 19. Arc plate; 20. Rotating rod; 21. Inner cavity; 22. Compression spring. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1

[0028] Reference Figure 1-2 A sedimentation tank is used to treat coal-containing wastewater, desulfurization wastewater, metallurgical wastewater and initial rainwater containing a large amount of suspended solids. It includes a cylindrical tank body 1, with an outlet 2 at the top of its outer wall and a drain outlet 11, a sludge outlet 12 and a manhole 13 at the bottom for easy access by staff.

[0029] The outer cylinder 6 is fixedly mounted above the center of the pool body 1 via a bracket, while the inner cylinder 10 is located at the center of the outer cylinder 6 via a bracket. A flared throat 8 is located below the inner cylinder 10, with its top necking upwards and then widening to connect to the bottom of the inner cylinder 10. The outer cylinder 6 is cylindrical, with its top positioned above the liquid surface to prevent water from flowing over the top of the inner cylinder 10 and onto the outlet liquid surface; the upper edge of the inner cylinder 10 is below the liquid surface. The included angle between the flared walls on both sides of the throat 8 is designed to be 120 degrees.

[0030] The integrated machine 9 consists of a sludge scraping mechanism and a mixer, both sharing the same rotating shaft. The rotating shaft of the sludge scraping mechanism extends to the outside of the tank body 1 through the inner cylinder 10 for installation and drive, while the mixer is responsible for mixing the chemicals and water to promote the sedimentation reaction.

[0031] The dosing pipe 4 and the water inlet pipe 5 are used to inject chemicals and water into the inner cylinder 10, respectively. One end of both pipes is fixedly inserted through the tank body 1 and the outer cylinder 6, and is fixedly connected to the inner cylinder 10. The dosing pipe 4 and the water inlet pipe 5 are arranged from top to bottom and are both located above the throat pipe 8 to ensure that the chemicals and water are fully mixed in the throat pipe 8.

[0032] The inclined tube zone 3 is located inside the tank body 1, between the outlet 2 and the dosing pipe 4. The inclined tube zone 3 consists of multiple inclined tubes connected at an inclined angle, used to shorten the settling distance and increase the sedimentation area, thereby improving sedimentation efficiency. Above it is the clear water zone, and below it is the buffer zone.

[0033] Specifically, the integrated machine 9 drives the water to flow upwards, mixing with the chemicals introduced through the dosing pipe to induce a flocculation reaction. Simultaneously, the sludge deposited at the bottom of the throat 8 flows upwards under the action of the integrated machine 9, entering the throat 8 and mixing with the incoming water, increasing the sludge concentration in the reaction zone of the inner cylinder 10. After the high-concentration sludge undergoes the flocculation reaction and crosses the upper edge of the inner cylinder 10, it flows downwards along the area between the outer cylinder 6 and the inner cylinder 10. Upon reaching the upper edge of the throat 8, the fluid velocity decreases due to the sudden increase in the flow cross-section, and the liquid flow slightly turns inwards. Reaching the steel plate at the lower end of the throat 8, the liquid velocity further decreases due to the obstruction and reflection effect of the steel plate, thus facilitating solid-liquid separation in the buffer zone below the inclined tube area 3, enhancing the sedimentation effect, and preventing the liquid flow from disturbing the already settled sludge at the bottom of the tank. Under the influence of the internal and external liquid level difference, the liquid between the outer cylinder 6 and the tank body 1 gradually flows towards the inclined tube area 3 and is discharged after passing through the inclined tube area 3.

[0034] The area formed by the cross-section where the lower edge of the outer cylinder 6 is located and the cross-section where the lower edge of the inclined tube region 3 is located (see attached) Figure 2 In the "buffer zone", due to the function of the throat 8, there is almost no horizontal liquid flow during the upward flow of water. The liquid flow in the buffer zone is only upward, and a stable suspended sludge layer can be formed in the buffer zone. The shallow pool sedimentation function of the inclined tube zone 3 can be maximized, resulting in low turbidity of the effluent.

[0035] The difference between this high-efficiency sedimentation tank and a conventional inclined tube sedimentation tank:

[0036] 1. It has a sludge return function. By setting a throat pipe at the lower end of the inner pipe 8, the integrated machine 9 can be easily controlled to increase the water flow. Moreover, the area covered by the flared mouth at the lower end of the throat pipe 8 is exactly the area where the sludge scraper scrapes the sludge towards the center, which is conducive to sludge return.

[0037] 2. The flared opening at the lower end of the inner cylinder can prevent the liquid from impacting the bottom sludge during the downward flow of the liquid between the inner and outer cylinders. At the same time, it reduces the kinetic energy of the radial flow of the liquid, which is conducive to the stable flow of the liquid in the buffer zone below the inclined tube under the potential energy of the liquid level difference between the inner and outer cylinder walls, achieving an ideal state of near-laminar flow.

[0038] 3. During equipment shutdown, the integrated machine's frequency converter decelerates to 0 Hz, and the unique design of the inner cylinder minimizes the impact of liquid flow on the sludge. During restart after shutdown, the mixer frequency gradually increases, and with the gradual increase in influent flow rate, due to the unique function of the inner cylinder's throat, the sludge gradually flows back to the inner cylinder's reaction zone, allowing the effluent to quickly meet standards.

[0039] This application can be used in the field of wastewater treatment, or in other fields applicable to this application.

[0040] Example 2

[0041] refer to Figure 3-4 An improvement upon Embodiment 1: An integrated high-efficiency sedimentation tank, applied in wastewater treatment, includes a sludge scraping mechanism comprising a main frame 14 and multiple scrapers 15 welded and fixed to the bottom of the main frame 14. Scraper strips 16 are inserted into the bottom of each scraper 15 for cleaning sediment from the tank bottom. An inner cavity 21 is formed inside each scraper 15, within which a fixed rod 17 is slidably mounted, engaging with a fixing groove 18 at the top of the scraper strip 16. The bottom ends of the fixed rod 17 are beveled, so that when the scraper strip 16 is removed, disassembled, or inserted, it first contacts the bevel, pushing the fixed rod 17 upwards before resetting, allowing its bottom end to insert into the fixing groove 18 and secure the scraper strip 16. A compression spring 22 is provided within the inner cavity 21, with its two ends fixed to one side of the inner wall of the inner cavity 21 and one end of the fixed rod 17, respectively, for resetting the fixed rod 17 after movement.

[0042] The scraper 15 has a rotating rod 20 inside, and multiple arc-shaped plates 19 are fixed to the outer wall of the rotating rod 20. The outer wall of the fixing rod 17 has an arc-shaped groove, and one end of the arc-shaped plate 19 passes through the inner cavity 21 and cooperates with the arc-shaped groove. A torsion spring is provided at the rotation point of the rotating rod 20 to ensure that the scraper 16 remains stable in its natural state. The rotation of the rotating rod 20 is achieved by rotating one end of it to the outside, and the outer end is shaped like a polygon to facilitate rotation.

[0043] Specifically, by rotating the rotating rod 20, the rotating rod 20 drives the arc plate 19 to move, causing it to disengage from the inside of the arc groove, thereby releasing the fixed state of the fixing rod 17. At this time, the scraper 16 can be pulled out or inserted to achieve disassembly or installation. Afterwards, the rotating rod 20 is reset by the torsion spring to fix the fixing rod 17 again, ensuring the stability of the installation. Compared with the existing bolt fixing method, it is more time-saving in terms of fixing convenience.

[0044] However, as is well known to those skilled in the art, the working principles and wiring methods of sludge scrapers and mixers are commonplace and are considered conventional methods or common knowledge. Therefore, they will not be elaborated here. Those skilled in the art can make any selections according to their needs or convenience.

[0045] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An integrated high-efficiency sedimentation tank for treating coal-containing wastewater, desulfurization wastewater, metallurgical wastewater, and initial rainwater containing a large amount of suspended solids, characterized in that... include: The pool body (1) has an outlet (2) on the top of the outer wall of the pool body (1) and a drain (11), a sludge discharge (12) and a manhole (13) on the bottom of the outer wall of the pool body (1). The outer cylinder (6) and the inner cylinder (10) are fixedly set above the center of the pool body (1). The inner cylinder (10) is fixedly set inside the center of the outer cylinder (6). A throat (8) is set below the inner cylinder (10). The throat (8) is shaped like a trumpet and opens downward. Its top end is necked upward and then expanded and fixedly connected to the bottom end of the inner cylinder (10). The integrated machine (9) consists of a sludge scraping mechanism and a mixer; The dosing pipe (4) and the water inlet pipe (5) are used to inject chemicals and water into the inner cylinder (10), respectively. One end of the dosing pipe (4) and the water inlet pipe (5) are fixedly inserted through the pool body (1) and the outer cylinder (6) and are fixedly connected to the inner cylinder (10). The dosing pipe (4) and the water inlet pipe (5) are arranged from top to bottom and are both located above the throat pipe (8). The inclined tube zone (3) is used to shorten the settling distance and increase the sedimentation area. The inclined tube zone (3) is set inside the tank body (1) and is located between the outlet (2) and the dosing pipe (4). The inclined tube zone (3) is composed of multiple inclined tubes connected at an inclined angle.

2. The integrated high-efficiency sedimentation tank according to claim 1, characterized in that, The sludge scraping mechanism includes a sludge scraper, and the rotating shaft of the sludge scraper is installed and driven by extending through the inner cylinder (10) to the outside of the tank body (1). The agitator and the sludge scraper use the same rotating shaft.

3. The integrated high-efficiency sedimentation tank according to claim 2, characterized in that, The angle between the two sides of the flared mouth wall of the throat (8) is 120 degrees.

4. The integrated high-efficiency sedimentation tank according to claim 3, characterized in that, The outer cylinder (6) is cylindrical and its top is above the liquid surface to prevent the water in the inner cylinder (10) from flowing over the top to the outlet liquid surface. The upper edge of the inner cylinder (10) is below the liquid surface.

5. The integrated high-efficiency sedimentation tank according to claim 4, characterized in that, The area above the inclined tube zone (3) is the clear water zone, and the area below the inclined tube zone (3) is the buffer zone.

6. The integrated high-efficiency sedimentation tank according to claim 1, characterized in that, The sludge scraping mechanism includes a main frame (14) and multiple scrapers (15) fixedly installed at the bottom of the main frame (14). Scraper strips (16) are inserted into the bottom of each scraper (15). Multiple inner cavities (21) are opened inside each scraper (15). A fixing rod (17) is slidably installed inside each inner cavity (21). Multiple fixing grooves (18) are opened at the top of each scraper strip (16). Both sides of the bottom end of the fixing rod (17) are sloped, and the bottom end is located inside the fixing groove (18). The inner cavities (21)... The scraper (15) is equipped with a compression spring (22), and the two ends of the compression spring (22) are respectively fixedly installed on one side of the inner wall of the inner cavity (21) and one end of the fixing rod (17). The scraper (15) is equipped with a rotating rod (20), and the outer wall of the rotating rod (20) is fixedly equipped with multiple arc plates (19). The outer wall of the fixing rod (17) is provided with an arc groove. One end of the arc plate (19) penetrates into the inner cavity (21) and cooperates with the arc groove. The rotation point of the rotating rod (20) is equipped with a torsion spring.

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