A multi-stage sedimentation tank for sewage treatment plants

Abstract

The utility model discloses a multistage sedimentation tank for sewage treatment plant, including the first sedimentation tank, second sedimentation tank through the water inlet pipe intercommunication, be equipped with the mud scraping mechanism, the residue removal mechanism in the first sedimentation tank, is equipped with the water inlet groove on the first sedimentation tank top inner wall, and the water inlet groove intercommunication water inlet pipe, is equipped with a plurality of water inlet holes in the water inlet groove, is equipped with the fixedly connected water outlet groove one side of water inlet groove, and the water outlet groove height is lower than the water inlet groove, the water outlet groove bottom is equipped with the water pipe and intercommunication outlet water pipe, one side of water outlet groove is equipped with the baffle of fixed connection through the support board, and the baffle height is higher than the water outlet groove, and the residue removal mechanism one end rotationally connects the mud scraping mechanism and cooperates the baffle to realize the cleaning to the surface dross of sewage, is equipped with the mud outlet and intercommunication first suction pipe in the first sedimentation tank bottom, and the mud scraping mechanism removes the sludge of bottom settlement and is along first suction pipe suction transfer. The utility model discloses can clean the dross in the first sedimentation tank through the residue removal mechanism, can greatly reduce the probability of dross into the next processing procedure.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment and purification technology, and specifically relates to a multi-stage sedimentation tank for wastewater treatment plants. Background Technology

[0002] Wastewater treatment plants typically use radial flow sedimentation tanks and horizontal flow sedimentation tanks for sedimentation treatment of wastewater entering the plant. Wastewater entering the plant includes domestic wastewater and industrial wastewater, and most of it undergoes pretreatment before entering the municipal sewage pipeline network to intercept larger impurities and garbage.

[0003] Regarding existing technologies for sedimentation treatment, a search revealed a wastewater treatment plant enhanced sedimentation radial flow sedimentation tank with announcement number CN219128380U. This sedimentation tank, by setting up a water distributor, can distribute water evenly and effectively solve the problem of poor mud-water separation in the central area of ​​the sedimentation tank when the influent volume is large. However, the scum generated during the wastewater sedimentation process is not effectively treated, resulting in the scum flowing over the effluent weir with the water flow and entering the next treatment process.

[0004] Another wastewater treatment sedimentation tank with the same drawbacks as the above is the one with announcement number CN223696897U, which lacks a perfect means of treating scum. First, the scum will directly enter the annular tank through the inlet and then enter the next treatment process. Second, large or clump-like scum will accumulate in large quantities on the surface of the wastewater outside the annular tank, which will block the inlet to a certain extent.

[0005] Based on the above-mentioned existing technologies and their drawbacks, the applicant has proposed a wastewater sedimentation solution that can remove scum to a greater extent. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a multi-stage sedimentation tank for sewage treatment plants. Through a sludge removal mechanism, the scum in the first sedimentation tank can be cleaned, which can greatly reduce the probability of the scum entering the next treatment process.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] A multi-stage sedimentation tank for a wastewater treatment plant includes a first sedimentation tank and a second sedimentation tank connected by an inlet pipe. The first sedimentation tank is equipped with a sludge scraping mechanism and a sludge removal mechanism. An inlet trough is provided on the inner wall of the top of the first sedimentation tank and is connected to an inlet pipe. The inlet trough has several inlet holes. An outlet trough is fixedly connected to one side of the inlet trough, and the height of the outlet trough is lower than that of the inlet trough. A water pipe is provided at the bottom of the outlet trough and is connected to the outlet pipe. A baffle is fixedly connected to one side of the outlet trough by a support plate, and the height of the baffle is higher than that of the outlet trough. One end of the sludge removal mechanism is rotatably connected to the sludge scraping mechanism and works with the baffle to clean the floating sludge on the surface of the wastewater. A sludge outlet is provided at the bottom of the first sedimentation tank and is connected to a first suction pipe. The sludge scraping mechanism scrapes off the sludge settled at the bottom and sucks it away along the first suction pipe.

[0009] The sludge scraping mechanism includes a first motor, a main shaft, a cross arm, and a scraper. The main shaft is rotatably connected to the mounting plate at the top of the first sedimentation tank and the bottom of the first sedimentation tank. One end of the cross arm is rotatably connected to the main shaft. The first motor is fixed on the mounting plate and provides power for the rotation of the main shaft. A fixed arm is provided on the cross arm and is fixedly connected to the main shaft. The scraper is obliquely arranged on the cross arm.

[0010] The slag removal mechanism includes a collection box and a scraper arm. The collection box is fixed to a baffle plate and has an inclined plate to guide the slag. The bottom of the collection box has a cleaning pipe that connects to the side wall of the first sedimentation tank. One end of the scraper arm is rotatably connected to a main shaft. The scraper arm has a movable plate and an obliquely fixed scraper. The movable plate has two sets of control arms, one pair in each set, which work together with the scraper arm to form a parallelogram structure. One end of the scraper arm has a roller that rolls along the flange plate at the end of the first sedimentation tank. The end of the scraper arm also has a second motor. The shaft end of the second motor has a sprocket and is connected to a sprocket preset on the central shaft of the roller via a chain.

[0011] The second sedimentation tank has a pipe on one side for water inlet. Inside the second sedimentation tank is a cylinder that is fixedly connected by a support arm. The top of the second sedimentation tank is equipped with a bracket, and a third motor is mounted on the bracket. The shaft end of the third motor is equipped with a rotating shaft, and a propeller blade is mounted on the rotating shaft. The bottom of the second sedimentation tank is equipped with an opening that connects to the water inlet pipe.

[0012] The pipeline is equipped with a dosing pipe for adding coagulant.

[0013] Preferably, the end of the water inlet pipe is provided with a mud storage box.

[0014] Preferably, the bottom of the second sedimentation tank is equipped with a second suction pipe to suction sludge.

[0015] Preferably, a number of reinforcing ribs are provided between the water outlet trough and the water inlet trough to improve stability.

[0016] The advantages of this utility model compared with the prior art are as follows:

[0017] 1) In this scheme, the first sedimentation tank is used as a sedimentation device for sewage over a long period of time, and the sewage and coagulant are initially mixed in the second sedimentation tank. Although some sedimentation will occur during this process, the main function is to transfer the sewage for mixing. The combination of the two can improve the sedimentation effect of sewage in the first sedimentation tank and achieve the purpose of multi-stage sedimentation.

[0018] 2) The first sedimentation tank is equipped with baffles and a sludge removal mechanism. The baffles are fixedly connected to the side wall of the effluent channel by brackets, and the baffles are higher than the side wall of the effluent channel to prevent scum from overflowing and entering the gap between the baffles and the effluent channel. Secondly, the sewage flows through the gap between the baffles and the effluent channel and enters the effluent channel. During this process, because the baffles are far from the center of the first sedimentation tank and the sewage adopts the "circumferential water intake" method in the first sedimentation tank, the sewage floats in the center of the first sedimentation tank and the radial area radiating outward from the center. This causes most of the scum to be surrounded and gathered by the baffles after floating, reducing the probability of entering the effluent channel along the gap between the baffles and the side wall of the effluent channel. At the same time, the baffles set at an angle in the sludge removal mechanism will gradually transfer the scum to the movable plate during rotation. Under the action of the control arm, the movable plate will scrape off the scum and enter the collection box along the inclined plate, thus achieving the cleaning of the scum. Attached Figure Description

[0019] Appendix Figure 1 This utility model discloses a schematic diagram of a multi-stage sedimentation tank for a wastewater treatment plant. Figure 1 ;

[0020] Appendix Figure 2 This utility model discloses a schematic diagram of a multi-stage sedimentation tank for a wastewater treatment plant. Figure 2 ;

[0021] Appendix Figure 3 This is a top view of the second sedimentation tank;

[0022] Appendix Figure 4 This is a schematic diagram of the wastewater inlet and internal structure of the second sedimentation tank;

[0023] Appendix Figure 5 This is a schematic diagram showing the position and structure of the slag removal mechanism and the baffle.

[0024] Appendix Figure 6 This is a schematic diagram of the slag removal mechanism;

[0025] Appendix Figure 7 This is a schematic diagram of the internal structure of the first sedimentation tank;

[0026] Appendix Figure 8 This is a schematic diagram of the sewage flow path within the first sedimentation tank;

[0027] In the diagram: 1. First sedimentation tank; 11. First suction pipe; 12. Mounting plate; 14. Rib plate; 15. Inlet trough; 151. Inlet hole; 16. Outlet trough; 161. Water pipe; 17. Baffle; 18. Sludge outlet; 2. Inlet pipe; 3. Outlet pipe; 4. Sludge scraping mechanism; 41. First motor; 42. Main shaft; 43. Cross arm; 44. Scraper; 45. Fixed arm;

[0028] 5. Slag removal mechanism; 51. Collection box; 511. Cleaning pipe; 512. Inclined plate; 52. Scraper arm; 53. Scraper blade; 54. Movable plate; 55. Second motor; 56. Roller; 57. Control arm;

[0029] 6. Second sedimentation tank; 61. Pipeline; 62. Second suction pipe; 63. Cylinder; 64. Support; 65. Third motor; 66. Shaft; 67. Propeller blade; 68. Dosing pipe; 69. Outlet; 7. Sludge storage tank. Detailed Implementation

[0030] To facilitate understanding by those skilled in the art, the following is in conjunction with the appendix. Figure 1-8 The technical solution of this utility model will be further described in detail below.

[0031] A multi-stage sedimentation tank for a wastewater treatment plant includes a first sedimentation tank 1 and a second sedimentation tank 6 connected by an inlet pipe 2. The first sedimentation tank 1 is equipped with a sludge scraping mechanism 4 and a sludge removal mechanism 5. An inlet trough 15 is provided on the inner wall of the top of the first sedimentation tank 1, and the inlet trough 15 is connected to the inlet pipe 2. The inlet trough 15 has several inlet holes 151. An outlet trough 16 is fixedly connected to one side of the inlet trough 15, and the height of the outlet trough 16 is lower than that of the inlet trough 15. A water pipe 161 is provided at the bottom of the outlet trough 16 and is connected to an outlet pipe 3. A baffle 17 is fixedly connected to one side of the outlet trough 16 by a support plate, and the height of the baffle 17 is higher than that of the outlet trough 16. One end of the sludge removal mechanism 5 is rotatably connected to the sludge scraping mechanism 4 and works with the baffle 17 to clean the floating sludge on the surface of the wastewater. A sludge outlet 18 is provided at the bottom of the first sedimentation tank 1 and is connected to a first suction pipe 11. The sludge scraping mechanism 4 scrapes off the sludge settled at the bottom and sucks it away along the first suction pipe 11.

[0032] The sludge scraping mechanism 4 includes a first motor 41, a main shaft 42, a cross arm 43, and a scraper 44. The main shaft 42 is rotatably connected to the mounting plate 12 at the top of the first sedimentation tank 1 and the bottom of the first sedimentation tank 1. One end of the cross arm 43 is rotatably connected to the main shaft 42. The first motor 41 is fixed on the mounting plate 12 and provides power for the rotation of the main shaft 42. A fixed arm 45 is provided on the cross arm 43 and is fixedly connected to the main shaft 42. The scraper 44 is obliquely arranged on the cross arm 43.

[0033] The slag removal mechanism 5 includes a collection box 51 and a scraper arm 52. The collection box 51 is fixed on the baffle 17. The collection box 51 is provided with an inclined plate 512 to guide the slag. The bottom of the collection box 51 is provided with a cleaning pipe 511, which is connected to the side wall of the first sedimentation tank 1. One end of the scraper arm 52 is rotatably connected to the main shaft 42. The scraper arm 52 is provided with a movable plate 54 and a scraper 53 fixed at an angle. The movable plate 54 is provided with two sets of control arms 57. Each set of control arms 57 is provided with a pair, which cooperate with the scraper arm 52 to form a parallelogram structure. One end of the scraper arm 52 is provided with a roller 56. The roller 56 rolls along the flange plate at the end of the first sedimentation tank 1. The end of the scraper arm 52 is also provided with a second motor 55. The shaft end of the second motor 55 is provided with a sprocket and is connected to a sprocket preset on the central shaft of the roller 56 by a chain.

[0034] Furthermore, during application, the top of the collection box should be lower than the height of the baffle to prevent the scum from overflowing the baffle when the movable plate scrapes off the scum; the bottom of the collection box should be submerged in the sewage to allow the inclined plate to smoothly guide the scum.

[0035] The second sedimentation tank 6 has a pipe 61 on one side for water inlet. Inside the second sedimentation tank 6 is a cylinder 63 fixedly connected by a support arm. The top of the second sedimentation tank 6 is provided with a support 64. A third motor 65 is provided on the support 64. The shaft end of the third motor 65 is provided with a rotating shaft 66. A propeller blade 67 is provided on the rotating shaft 66. The bottom of the second sedimentation tank 6 is provided with an opening 69 and connected to the water inlet pipe 2.

[0036] The pipeline 61 is equipped with a dosing pipe 68 for adding coagulant.

[0037] The inlet pipe 2 is equipped with a mud storage box 7 at one end.

[0038] The bottom of the second sedimentation tank 6 is equipped with a second suction pipe 62 to suck up sludge.

[0039] Several reinforcing ribs 14 are provided between the water outlet 16 and the water inlet 15 to improve stability.

[0040] In summary, the electronic or electrical components, including but not limited to motors, are existing components that are custom-made or purchased. The electrical connections between these components are conventional circuit or electrical connections in the prior art and are not within the scope of protection of this invention. The coordinated operation between these components is achieved based on existing controllers and adapted control programs and programming logic sequences. The aforementioned control programs are not within the scope of protection of this utility model.

[0041] In summary, including but not limited to power systems such as motors and their respective transmission systems, protective covers should be provided according to the actual installation location if necessary, and sealing rings should be provided at the relative rotating connections to prevent wear or damage to the power system and transmission system caused by the external environment, and to further ensure the normal operation of the power system and transmission system.

[0042] A multi-stage sedimentation tank for a wastewater treatment plant operates as follows:

[0043] The device is powered by an external power source and achieves coordinated operation between various mechanical components based on the existing PLC controller and the adapted control program and programming logic sequence.

[0044] Wastewater enters the second sedimentation tank 6 through pipe 61, while coagulant is added via dosing pipe 68. The wastewater then sinks down along the cylinder 63. At this time, the third motor 65 drives the propeller blades 67 to rotate, lifting the water inside the cylinder 63. The lifted wastewater then sinks down outside the cylinder 63, forming a circulation. This process assists in the mixing of wastewater and coagulant. (See appendix) Figure 7-8 (as shown); secondly, during this period, the sewage will enter the first sedimentation tank 1 through the inlet 69 and the inlet pipe 2 for secondary sedimentation; during this period, the sludge storage tank 7 will receive the sludge that settles when the sewage rises; the second suction pipe 62 can also clean the settled sludge; during this period, the second sedimentation tank 6 serves as a device for mixing coagulants with sewage, and the wastewater will remain and mix in it before entering the first sedimentation tank 1; in contrast, the sewage will be stored and settled in the first sedimentation tank 1 for a long time.

[0045] After entering the inlet tank 15, the wastewater sinks along the inlet hole 151 and then converges towards the center of the tank. During this process, sludge gradually settles and clear water rises. As wastewater continues to enter, the supernatant overflows through the gap between the baffle 17 and the outlet tank 16 and enters the outlet tank 16. Then, it flows along the water pipe 161 into the outlet pipe 3 and is discharged to the next treatment process. Subsequently, the baffle 17 can collect most of the scum, which is then cleaned in conjunction with the scum removal mechanism 5 (see attached diagram). Figure 4 (As shown).

[0046] During the slag removal process, the second motor 55 drives the scraper arm 52 to rotate around the main shaft 42; then the scraper arm 52 scrapes and collects the slag, and the slag can be gathered at the movable plate 54 by the obliquely set scraper 53. After the movable plate 54 rotates, it will scrape the slag along the inclined plate 512 on the collection box 51 into the collection box 51 and discharge it along the cleaning pipe 511.

[0047] Finally, the sludge in the first sedimentation tank 1 will be transferred by suction through the first suction pipe 11; it should be noted that the first suction pipe, the second suction pipe, and the sludge storage tank are connected to an external sludge pump to provide suction power.

[0048] In the description of this invention, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, the connection methods are divided into fixed connection and movable connection. Fixed connection methods include, but are not limited to, welding and bolting. Movable connection methods include, but are not limited to, sliding connection, rotating connection, and threaded connection. The connection method to achieve the desired effect should be selected according to the application of the solution. Washers are provided in the connection process of the bolts, fixing bolts, studs and nuts. At the same time, the connection of the bolts, fixing bolts, studs and nuts is fixed by thread locking.

[0050] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A multi-stage sedimentation tank for a wastewater treatment plant, comprising a first sedimentation tank and a second sedimentation tank connected by an inlet pipe, characterized in that... The first sedimentation tank is equipped with a sludge scraping mechanism and a sludge removal mechanism. An inlet trough is located on the inner wall of the top of the first sedimentation tank, connected to an inlet pipe. Several inlet holes are located within the inlet trough. An outlet trough is fixedly connected to one side of the inlet trough, and its height is lower than the inlet trough. A water pipe is located at the bottom of the outlet trough and connected to the outlet pipe. A baffle is fixedly connected to one side of the outlet trough via a support plate, and its height is higher than the outlet trough. One end of the sludge removal mechanism is rotatably connected to the sludge scraping mechanism and works with the baffle to clean the floating sludge on the surface of the wastewater. A sludge outlet is located at the bottom of the first sedimentation tank and connected to a first suction pipe. The sludge scraping mechanism scrapes off the settled sludge at the bottom and transfers it along the first suction pipe. The sludge scraping mechanism includes a first motor, a main shaft, a cross arm, and a scraper. The main shaft is rotatably connected to the mounting plate at the top of the first sedimentation tank and the bottom of the first sedimentation tank. One end of the cross arm is rotatably connected to the main shaft. The first motor is fixed on the mounting plate and provides power for the rotation of the main shaft. A fixed arm is provided on the cross arm and is fixedly connected to the main shaft. The scraper is obliquely arranged on the cross arm. The slag removal mechanism includes a collection box and a scraper arm. The collection box is fixed to a baffle plate and has an inclined plate to guide the slag. The bottom of the collection box has a cleaning pipe that connects to the side wall of the first sedimentation tank. One end of the scraper arm is rotatably connected to a main shaft. The scraper arm has a movable plate and an obliquely fixed scraper. The movable plate has two sets of control arms, one pair in each set, which work together with the scraper arm to form a parallelogram structure. One end of the scraper arm has a roller that rolls along the flange plate at the end of the first sedimentation tank. The end of the scraper arm also has a second motor. The shaft end of the second motor has a sprocket and is connected to a sprocket preset on the central shaft of the roller via a chain.

2. A multi-stage sedimentation tank for a wastewater treatment plant according to claim 1, characterized in that... The second sedimentation tank has a pipe on one side for water inlet. Inside the second sedimentation tank is a cylinder that is fixedly connected by a support arm. The top of the second sedimentation tank is equipped with a support, and a third motor is mounted on the support. The shaft end of the third motor is equipped with a rotating shaft, and a propeller blade is mounted on the rotating shaft. The bottom of the second sedimentation tank is equipped with an opening that connects to the water inlet pipe. The pipeline is equipped with a dosing pipe for adding coagulant.

3. A multi-stage sedimentation tank for a wastewater treatment plant according to claim 1, characterized in that... A mud storage box is provided at the end of the water inlet pipe.

4. A multi-stage sedimentation tank for a wastewater treatment plant according to claim 2, characterized in that... The bottom of the second sedimentation tank is equipped with a second suction pipe to suck up sludge.

5. A multi-stage sedimentation tank for a wastewater treatment plant according to claim 1, characterized in that... Several reinforcing ribs are provided between the water outlet trough and the water inlet trough.

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