Pollution discharge device for secondary sedimentation tank

Abstract

The utility model provides a sewage discharge device for a secondary sedimentation tank, which comprises at least two sludge suction pipes, a sludge discharge pipe, a sludge discharge pipe and a sludge discharge pipe, and the sludge suction pipes partially extend to the lower part of a sludge collection tank in the secondary sedimentation tank; the connecting piece is arranged at the outlet of the sludge suction pipe; the water inlet end of the prefabricated pipeline is connected with the outlet of the sludge suction pipe through the connecting piece, and the water outlet end of the prefabricated pipeline is connected with a sludge pump; one end of the first pipeline is connected with the water outlet end of the sludge pump, the other end of the first pipeline is connected with a sludge discharge pipe, and the pumped sludge is conveyed to the sludge discharge pipe through the first pipeline after the sludge pump is pressurized; according to the invention, precipitated active sludge is extracted from the bottom of the secondary sedimentation tank, sludge accumulation at the bottom of the secondary sedimentation tank is avoided, and emptying and desilting time of the secondary sedimentation tank is greatly reduced.

Description

Technical Field

[0001] This application belongs to the field of sewage discharge technology, specifically relating to a sewage discharge device for a secondary sedimentation tank. Background Technology

[0002] The existing static pressure peripheral drive sludge scraper uses drive devices on both sides of the walkway to pump sludge settled at the bottom of the tank through suction pipes to a sludge return trough. The sludge then flows through a central return pipe to the sludge return pump station. This type of secondary sedimentation tank has a flat bottom design, requiring the entire tank to be emptied for underwater component maintenance. Typically, several submersible pumps or sludge pumps are fixed to the scraper's walkway to remove wastewater. However, due to the flat bottom, the submersible pumps cannot operate beyond a certain point. Furthermore, during pumping, the pump power cables and sludge mixing pipes obstruct the scraper and secondary sedimentation tank walkways, preventing equipment operation and forcing passive sludge pumping from fixed points. This results in sludge around the pumps being removed, but a large amount of highly concentrated activated sludge accumulates in most of the 35m diameter circular tank bottom. To maintain the scraper blades and supports at the bottom, this sludge needs to be removed as much as possible.

[0003] Current technology typically uses high-pressure water jets to dilute the sludge at the bottom of the tank, reducing its concentration, and then continuously diluting and removing the sludge. However, this method of sludge removal and cleaning is inefficient and increases the difficulty of maintaining the underwater equipment in the secondary sedimentation tank. Utility Model Content

[0004] Therefore, the technical problem to be solved by this application is to provide a method that can ensure the gradual extraction of deposited activated sludge from the bottom of the tank, followed by the extraction of supernatant, effectively avoiding the problem of sludge accumulation at the bottom of the tank in traditional methods, and shortening the emptying and overall sludge removal time of the secondary sedimentation tank.

[0005] To address the aforementioned issues, this application provides a sludge discharge device for a secondary sedimentation tank, comprising: a sludge suction pipe, including at least two pipes, wherein a portion of the sludge suction pipe extends below the sludge collection trough within the secondary sedimentation tank;

[0006] A connector is provided at the outlet of the suction pipe;

[0007] The prefabricated pipe has its inlet end connected to the outlet end of the sludge suction pipe via the connector, and its outlet end connected to the sludge pump.

[0008] The first pipe is connected at one end to the outlet of the sludge pump and at the other end to the sludge discharge pipe. After being pressurized, the sludge pump transports the extracted sludge to the sludge discharge pipe through the first pipe.

[0009] Furthermore, the sewage discharge device for the secondary sedimentation tank also includes a self-priming device, which is disposed between the sludge pump and the outlet end of the prefabricated pipe.

[0010] Furthermore, the prefabricated pipe includes at least two water inlets, which are connected to at least two outlets of the sludge suction pipe;

[0011] The outlet end of the prefabricated pipe is connected to the inlet end of the sludge pump via the self-priming device.

[0012] Furthermore, the sewage discharge device for the secondary sedimentation tank also includes: a flange, which is installed on the prefabricated pipe, and one end of the flange is fixedly connected to the connector;

[0013] The outlet end of the prefabricated pipe is connected to the self-priming device via a second pipe.

[0014] Furthermore, a regulating valve is installed at the outlet end of the prefabricated pipe.

[0015] Furthermore, the sludge discharge device for the secondary sedimentation tank also includes a sealing plate, which is movably disposed at the outlet of the sludge suction pipe. After being pressurized by the sludge pump, the pumped sludge is transported to the sludge discharge pipe through the first pipe.

[0016] Furthermore, the sludge discharge device for the secondary sedimentation tank also includes a manifold, which is connected to the sludge discharge pipe and the sludge collection trough respectively.

[0017] Furthermore, the manifold is equipped with a stirring device inside for stirring the sludge inside the manifold.

[0018] Furthermore, the secondary sedimentation tank includes a sludge scraper;

[0019] The sewage discharge device is installed on the walkway bridge of the sludge scraper.

[0020] Furthermore, a regulating valve is installed at each outlet end of the prefabricated pipe.

[0021] Beneficial effects

[0022] This invention, through the installation of prefabricated pipelines and adjustable regulating valves, can precisely control the flow rate of different sludge suction pipes, ensuring that the deposited activated sludge is gradually extracted from the bottom of the tank, followed by the extraction of the supernatant. This sequential extraction method effectively avoids the problem of sludge accumulation at the bottom of the tank in traditional methods, thereby significantly shortening the emptying time of the secondary sedimentation tank and the overall sludge removal time, and improving the efficiency of sludge removal operations. By configuring manual regulating valves, operators can flexibly adjust the flow rate of each sludge suction pipe according to actual conditions to adapt to the sludge extraction needs under different working conditions. Furthermore, the combination of manual and automatic modes ensures ease of operation and reserves space for future automation upgrades. In addition, the device structure of this invention is relatively simple, and the use of prefabricated pipelines reduces the complexity and difficulty of on-site construction, lowering installation costs. At the same time, since the connections between various components mainly use easily disassembled parts such as flanges, the maintenance difficulty and cost of the device are reduced. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the secondary sedimentation tank in an embodiment of this application;

[0024] Figure 2 This is another structural schematic diagram of the secondary sedimentation tank in an embodiment of this application.

[0025] The attached reference numerals are as follows: 11. Walkway bridge of the sludge scraper; 2. Sludge collection trough; 3. Suction pipe; 31. Outlet; 4. Connecting component; 5. Prefabricated pipe; 51. Water inlet; 52. Water outlet; 53. Regulating valve; 6. Sludge pump; 61. Water inlet; 62. Water outlet; 63. Self-priming device; 7. First pipe; 8. Second pipe; 9. Flange; 91. Sealing plate; 10. Sludge discharge point; 101. Sludge discharge pipe. Detailed Implementation

[0026] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are 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 are not intended to 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.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0030] See also Figures 1 to 2 As shown in the embodiment of this application, a sludge discharge device for a secondary sedimentation tank includes: a sludge suction pipe 3, comprising at least two pipes, with a portion of the sludge suction pipe 3 extending below the sludge collection trough 2 within the secondary sedimentation tank; a connector 4 disposed at the outlet 31 of the sludge suction pipe 3; a prefabricated pipe 5, with its inlet end 51 connected to the outlet 31 of the sludge suction pipe 3 via the connector 4, and its outlet end 52 connected to a sludge pump 6; and a first pipe 7, one end connected to the outlet end 62 of the sludge pump 1, and the other end connected to a sludge discharge pipe 101. Preferably, in this application, a set of sludge suction devices is symmetrically arranged around the center of the secondary sedimentation tank. The sludge suction device is designed with four evenly distributed sludge suction pipes, each with an adjustable suction port at its lower end, ensuring precise control of the sludge suction depth and coverage of the area below the sludge collection trough 2, effectively avoiding sludge deposition and dead zones.

[0031] In this embodiment, the first pipe 7 can be configured as a steel wire flexible hose. The steel wire flexible hose has good flexibility, allowing for flexible bending and twisting. This enables it to adapt to various complex terrains and layouts during installation, reducing installation difficulty and time costs, and facilitating later maintenance and replacement. The connector 4 used in the embodiments of this application facilitates installation, disassembly, and maintenance. Preferably, the connector 4 is equipped with a filter screen to initially filter out larger particulate impurities, reducing the burden on subsequent processing equipment.

[0032] In one feasible implementation, the prefabricated pipe 5 is made of corrosion-resistant, high-strength HDPE material, reducing the complexity of on-site construction and improving installation efficiency. Furthermore, the water inlet 51 of the prefabricated pipe 5 is tightly connected to the connector 4 via a flange connection to ensure a tight seal.

[0033] In one feasible embodiment, the sludge discharge device for the secondary sedimentation tank further includes a self-priming device 63, which is disposed between the sludge pump 6 and the outlet 52 of the prefabricated pipe 5. In this embodiment, the self-priming device 63 can quickly generate negative pressure when the sludge pump 6 starts, automatically expelling air from the prefabricated pipe 5 and the sludge pump 6, ensuring that the sludge pump 6 can quickly suck in sludge. This avoids the cumbersome process of manually venting air or waiting for natural venting required by traditional sludge discharge devices, significantly improving the start-up efficiency of the sludge discharge device. Due to the continuous action of the self-priming device 63, a certain negative pressure is maintained in the prefabricated pipe 5 during the sludge discharge process, thereby preventing sludge accumulation and blockage in the pipe. This stability not only ensures the smooth progress of the sludge discharge process but also extends the service life of the pipe and the sludge pump. In addition, the application of the self-priming device 63 reduces the number of downtime maintenance caused by sludge blockage of the pipe, reducing maintenance costs. At the same time, its automation characteristics also reduce the labor intensity of operators and improve work efficiency.

[0034] In one feasible implementation, the prefabricated pipe 5 includes at least two inlet ends 51, and the at least two inlet ends 51 are connected to at least two outlets of the sludge suction pipe; the outlet end 52 of the prefabricated pipe 5 is connected to the inlet end 61 of the sludge pump 6 through the self-priming device 63.

[0035] In this embodiment, the prefabricated pipe 5 has a U-shaped structure, which includes two inlet ends 51. The two inlet ends 51 are symmetrically arranged about the outlet end 52 of the prefabricated pipe 5. The prefabricated pipe 5 can also be configured as a W-shape, in which case the prefabricated pipe 5 has three inlet ends 51.

[0036] In this embodiment, the prefabricated pipe 5 is configured with a U-shaped or W-shaped structure, with its inlet ends 51 symmetrically arranged about the outlet end 52 or the center of the secondary sedimentation tank. This layout ensures uniform sludge extraction from different areas of the secondary sedimentation tank, avoiding over-extraction or omission in local areas, thereby improving the overall sewage discharge efficiency. Furthermore, the U-shaped or W-shaped configuration of the prefabricated pipe 5 allows for flexible configuration according to actual operating conditions. For example, a W-shaped structure can be chosen to increase the number of inlet ends when the sludge concentration is high or the secondary sedimentation tank area is large; while a U-shaped structure can be chosen when space is limited or the sludge concentration is low. Since the multiple inlet ends 51 of the prefabricated pipe 5 can operate independently, the inlet ends 51 can be shut off one by one during maintenance without stopping the entire sewage discharge system, thereby reducing downtime and impact on production.

[0037] In one feasible implementation, a regulating valve 53 is provided at each outlet 52 of the prefabricated pipe 5. The regulating valve 53 allows for independent and precise control of the flow rate at each outlet 52 of the prefabricated pipe 5, meeting the specific needs of different water usage points or processes, and improving the flexibility and efficiency of the device operation. In complex piping systems, the demand at each outlet 52 of the prefabricated pipe 5 may change at any time. The flexible adjustment capability of the regulating valve 53 can quickly respond to these changes, maintaining stable water supply and pressure balance throughout the system, and reducing system failures caused by flow fluctuations. Furthermore, the design of the regulating valve 53 makes maintenance of individual outlets simpler and faster, without interrupting the operation of the entire system.

[0038] In one feasible embodiment, the sludge discharge device for the secondary sedimentation tank further includes: a flange 9, disposed on the prefabricated pipe 5, one end of the flange 9 being fixedly connected to the connector 4; the outlet end 52 of the prefabricated pipe 5 is connected to the self-priming device 63 via a connecting second pipe 8. In this application, connecting the outlet end 52 of the prefabricated pipe 5 to the self-priming device 63 via the second pipe 8 ensures smooth flow of sludge in the pipe, reducing the risk of blockage and siltation. Simultaneously, the introduction of the self-priming device 63 further improves the automation level and operating efficiency of the sludge discharge device, reducing the difficulty and labor intensity of manual operation.

[0039] In one feasible embodiment, the sludge discharge device for the secondary sedimentation tank further includes a sealing plate 91, which is movably disposed at the outlet 31 of the sludge suction pipe 3 for sealing the sludge suction pipe 3 when it is not in operation during the dredging process.

[0040] In this embodiment, a quick-locking / unlocking mechanism, such as a spring latch or a pneumatic / electric drive, is introduced for the sealing plate 91, enabling the sealing plate 91 to quickly and reliably close or open the outlet 31 of the suction pipe 3. This design improves the automation of the emptying process, reduces manual operation time, and ensures effective sealing of the suction pipe 3 when not in operation, preventing unnecessary liquid backflow or leakage.

[0041] In this embodiment, the sealing plate 91 is made of corrosion-resistant and wear-resistant material to adapt to the complex sewage environment in the secondary sedimentation tank and ensure long-term stable operation. The sealing plate 91 is installed at the outlet 31 of the sludge suction pipe 3 to ensure that the sludge suction pipe in a non-working state can be directly sealed during sewage discharge. Before the sewage discharge device starts working, all sludge suction pipes 3 are in a standby state, and the sealing plate 91 closes the outlet 31 of all sludge suction pipes by default to prevent sewage leakage. According to the distribution of sludge in the secondary sedimentation tank and sewage discharge requirements, the operator selects the area of ​​the sludge suction pipe 3 that needs to be worked and connects it to the inlet end 51 of the prefabricated pipe 5. Through the control system or manual operation, the drive device is started or the sealing plate 91 is manually pushed away from the outlet 31 of the sludge suction pipe 3 connected to the inlet end 51 of the prefabricated pipe 5, so that the sludge suction pipe enters the working state. During sewage discharge, the opened sludge suction pipe 3 begins to suck up the sludge at the bottom of the secondary sedimentation tank and transports it to the subsequent treatment stage. During this process, the sludge suction pipes 3 in other non-working states remain closed, sealed by their respective sealing plates 91. When the sludge in the current working area is emptied or it is necessary to switch to another area, the control system or operator will operate the drive device again to close the sealing plate 91 of the current working area and open the sealing plate 91 of the next working area. After the sewage discharge device has completed the sewage discharge task of all predetermined areas, all non-working sludge suction pipes 3 will be sealed by their respective sealing plates 91 to prevent sewage backflow and leakage.

[0042] In one feasible implementation, the sludge discharge device for the secondary sedimentation tank further includes a manifold 10, which is connected to the sludge discharge pipe 101 and the sludge collection tank 2 respectively.

[0043] In this embodiment, a stirring device is provided inside the manifold 10 to stir the sludge inside. This application maintains the fluidity of the sludge by stirring it inside the manifold 10, preventing sludge from settling inside the manifold 10 or the connecting pipe, and reducing the risk of blockage. This is crucial for maintaining the continuous and stable operation of the sewage discharge device, avoiding downtime for maintenance and production losses due to blockage.

[0044] In one feasible implementation, the secondary sedimentation tank includes a sludge scraper; the sludge discharge device is mounted on the walkway bridge 11 of the sludge scraper. This application places the sludge discharge device on the walkway bridge 11 of the sludge scraper, making full use of the space above the secondary sedimentation tank and avoiding additional space occupation at the bottom or perimeter of the tank. This compact layout not only saves land resources but also helps improve the overall layout efficiency of the wastewater treatment plant. When the sludge scraper is running, its walkway bridge 11 spans the secondary sedimentation tank, providing convenient access for operators. Placing the sludge discharge device here allows operators easier access and maintenance without having to detour or enter restricted areas. This design improves operational safety and convenience.

[0045] In this embodiment, after all pipelines are connected, the sludge pump 6 and the sludge scraper can be started. While the sludge scraper is running, the sludge pump 6 discharges the settled sludge and supernatant from the secondary sedimentation tank to the sludge discharge pipe 101. After this device is put into operation, it can extract the settled activated sludge from the bottom of the tank, followed by the supernatant. This avoids sludge accumulation at the bottom of the tank, thus greatly reducing the time required for emptying and cleaning the secondary sedimentation tank.

[0046] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0047] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A device for the removal of sludge from a secondary sedimentation tank, characterized in that The utility model relates to a sewage discharging device for secondary sedimentation tank, comprising: a suction pipe (3) including at least two, and the suction pipe (3) extends partially to the below of sludge collecting tank (2) in the secondary sedimentation tank; a connecting piece (4) arranged at the outlet (31) of the suction pipe (3); a prefabricated pipe (5) with the inlet (51) connected to the outlet (31) of the suction pipe (3) through the connecting piece (4), and the outlet (52) of the prefabricated pipe (5) connected to the sludge pump (6); a first pipe (7) with one end connected to the outlet (62) of the sludge pump (6) and the other end connected to the sludge discharge pipe (101).

2. The sewage discharging device for secondary sedimentation tank according to claim 1, further comprising: a self-suction device (63) arranged between the sludge pump (6) and the outlet (52) of the prefabricated pipe (5).

3. The sewage discharging device for secondary sedimentation tank according to claim 2, wherein: the prefabricated pipe (5) includes at least two inlets (51) communicating with at least two outlets (31) of the suction pipe (3); the outlet (52) of the prefabricated pipe (5) is connected to the inlet (61) of the sludge pump (6) through the self-suction device (63).

4. The apparatus according to claim 3, wherein Further comprising: a flange (9) arranged on the prefabricated pipe (5), and one end of the flange (9) fixedly connected to the connecting piece (4); the outlet (52) of the prefabricated pipe (5) is connected to the self-suction device (63) through the second pipe (8).

5. The sewage discharging device for secondary sedimentation tank according to claim 4, wherein: an adjusting valve (53) is arranged at the outlet (52) of the prefabricated pipe (5).

6. The sewage discharging device for secondary sedimentation tank according to claim 5, further comprising: a sealing plate (91) movably arranged at the outlet (31) of the suction pipe (3).

7. The sewage discharging device for secondary sedimentation tank according to claim 6, further comprising: a flow collecting barrel (10) communicating with the sludge discharge pipe (101) and the sludge collecting tank (2) respectively.

8. The sewage discharging device for secondary sedimentation tank according to claim 7, wherein: the flow collecting barrel (10) is internally provided with a stirring device for stirring the sludge in the flow collecting barrel (10).

9. The sewage discharging device for secondary sedimentation tank according to any one of claims 1-8, wherein: the secondary sedimentation tank includes a mud scraper; the sewage discharging device is arranged on the walkway bridge (11) of the mud scraper. an adjusting valve (53) is arranged at each outlet (52) of the prefabricated pipe (5).

10. The apparatus for cleaning the secondary sedimentation basin according to claim 4, wherein ​

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