A two-stage sedimentation tank with a side sludge discharge system and a wastewater treatment method

Abstract

This invention relates to the field of wastewater treatment technology and discloses a two-stage sedimentation tank with a lateral sludge discharge system and a wastewater treatment method. The two-stage sedimentation tank includes a tank body, a lateral sludge discharge matrix system, a non-powered scum self-separation device, and an integrated maintenance system. The lateral sludge discharge matrix system achieves precise sludge collection through a matrix of pipes and laterally inclined anti-clogging sludge discharge ports. The non-powered scum self-separation device utilizes water film tension to automatically separate scum. The integrated maintenance system achieves self-cleaning of the pipes through wire-controlled barrier blades. This invention solves the problems of existing two-stage sedimentation tanks, such as numerous dead zones in sludge discharge, high energy consumption in scum separation, easy pipe blockage, and inconvenient maintenance. It eliminates the need for additional power to drive scum separation, significantly improves sludge discharge efficiency and reliability, facilitates maintenance, and is suitable for various wastewater treatment scenarios.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a two-stage sedimentation tank with a lateral sludge discharge system and a wastewater treatment method. Background Technology

[0002] As a core facility in wastewater treatment processes, the secondary sedimentation tank is mainly used to separate large molecular pollutants and scum from wastewater after flocculation treatment. Its separation efficiency directly affects the final effluent quality.

[0003] Existing sludge removal systems in secondary sedimentation tanks mostly employ a central sludge discharge pipe or a bottom suction sludge machine structure. The central sludge discharge pipe can only collect sludge from the central area of ​​the tank bottom, easily creating dead zones at the tank edges, leading to sludge accumulation and affecting treatment efficiency. While bottom suction sludge machines offer wider coverage, they suffer from high energy consumption, complex structure, and susceptibility to failure, and require a high degree of tank bottom flatness, resulting in high maintenance costs. Regarding scum separation, existing technologies largely rely on mechanical scrapers or air flotation systems. Mechanical scrapers require specialized drive units, resulting in high energy consumption and potential interference with the tank structure. Air flotation systems require additional aeration equipment, increasing operating costs and also presenting the problem of uneven bubble distribution leading to incomplete scum separation.

[0004] Meanwhile, the existing sludge discharge pipes mostly have a straight-line design, making them prone to blockage by stones or large debris settled at the bottom of the tank. Furthermore, when the system is shut down, residual sludge in the pipes tends to settle and solidify, further exacerbating the risk of blockage. Once a blockage occurs, traditional methods require manual entry into the tank bottom for inspection. After inspection, the entire pipe must be dismantled, replaced, or cleaned, which is cumbersome, labor-intensive, and can interrupt the wastewater treatment process, affecting treatment efficiency. In addition, existing non-powered scum separation devices have poor adaptability to water flow fluctuations; when water level changes are too large, they need to be dismantled and redesigned, lacking flexibility and failing to meet the treatment needs under complex operating conditions. These problems make it difficult to balance the operational stability, treatment efficiency, and economy of existing secondary sedimentation tanks, limiting their application in the wastewater treatment field. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a two-stage sedimentation tank with a lateral sludge discharge system and a wastewater treatment method, thus solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a two-stage sedimentation tank with a lateral sludge discharge system, comprising a tank body, a lateral sludge discharge matrix system, a non-powered scum self-separation device, and an integrated maintenance system;

[0007] The tank is divided into a sedimentation zone, a scum separation zone, and a clear water outlet zone. The sedimentation zone is located at the bottom of the tank, the scum separation zone is located above the sedimentation zone, and the clear water outlet zone is connected to the scum separation zone through a pipe.

[0008] The lateral sludge discharge matrix system is deployed at the bottom of the sedimentation tank, the non-powered scum self-separation device is installed in the scum separation zone, and the integrated maintenance system works in conjunction with the lateral sludge discharge matrix system.

[0009] Optionally, the lateral sludge discharge matrix system includes multiple matrix-distributed sludge discharge pipes. Each sludge discharge pipe has an independent control valve at the end near the drive motor. Multiple laterally inclined sludge discharge ports are opened at a preset distance between the middle of the side of the sludge discharge pipe and the bottom of the pool. Each laterally inclined sludge discharge port is equipped with a baffle. The baffle is connected to a blocking blade by two rings. The blocking blade can swing within a preset range of motion. The sludge discharge pipes are connected by a diversion pipe, which is used to balance the suction and flow rate of each sludge discharge port.

[0010] Optionally, the non-powered scum self-separation device includes a circumferential corrugated scum baffle, a buoyancy adjustment column, and a bottom retractable hose; the corrugated scum baffle is made of thin stainless steel plate, the buoyancy adjustment column integrates an anti-backflow inlet and a bottom cylindrical valve to form a closed-loop buoyancy control system, and the farthest corner of the buoyancy adjustment column is rounded; the retractable hose is made of rubber and is used to limit the range of motion of the separation device and provide a restoring force; the integrated maintenance system includes a maintenance control unit and multiple wires, one end of each wire is connected to the corresponding barrier leaf, and the other end extends to the outside of the pool and is linked with the maintenance control unit.

[0011] A wastewater treatment method with a two-stage sedimentation tank featuring a side sludge discharge system includes the following specific steps:

[0012] S1. After flocculation treatment, the wastewater is introduced into the sedimentation zone of the tank, where large molecular pollutants settle. The sludge formed by the sedimentation is discharged by the lateral sludge discharge matrix system.

[0013] S2. The supernatant flows to the scum separation zone, where the scum is separated from the water by a non-powered scum self-separation device.

[0014] S3. The clear water after separating the scum is discharged through the clear water discharge area;

[0015] S4. Regularly perform self-cleaning maintenance on the lateral sludge discharge matrix system through the integrated maintenance system.

[0016] Optionally, the specific process of the lateral sludge discharge matrix system is as follows:

[0017] After the drive motor is started, the blocking blades at the lateral tilted sludge discharge ports open inward. By pre-setting the area, weight, and range of motion of the blocking blades, the suction force of each lateral tilted sludge discharge port is balanced.

[0018] When the sludge discharge pipe is too long, the suction and flow rate of the laterally inclined sludge discharge port at the end are supplemented by the diversion pipe to ensure that the sludge in the sedimentation zone is collected without dead corners and the sludge is discharged from the tank through the sludge discharge pipe.

[0019] Optionally, the process of step S2 is as follows:

[0020] When the supernatant flows through the corrugated scum baffle, the hydrophilicity of the stainless steel plate forms a uniform thin water film. Under the action of water film tension, the scum is lifted by the cutting edge of the corrugated scum baffle and scraped off the water surface, accumulating above the cutting edge.

[0021] The buoyancy regulating column dynamically adjusts the water level according to the buoyancy of the water in the pool through the anti-backflow inlet and the bottom cylindrical valve, maintaining a constant water level difference. The telescopic hose generates a restoring force through deformation, ensuring the stable operation of the non-powered scum self-separation device.

[0022] Optionally, the maintenance process of the integrated maintenance system is as follows:

[0023] When the sludge discharge system stops working, the maintenance control unit pulls the wire, which drives the baffle blades to rise, causing the clean water in the sludge discharge pipe to flow and flush, thus completing the self-cleaning of the sludge discharge pipe.

[0024] Repeat this operation periodically to prevent sludge from settling and clogging the sludge discharge pipe;

[0025] During maintenance, the working status of the lateral tilted sludge discharge port can be observed by shining a strong light on it. If the lateral tilted sludge discharge port is blocked, it is only necessary to remove the baffle, clean it, and then reinstall it.

[0026] Optionally, the lateral sludge discharge matrix system adopts a zoned controllable sludge discharge mechanism. Based on the sludge concentration distribution data in the sedimentation zone, the sludge discharge pipes in the corresponding areas are dynamically opened and closed by independently controlling valves to achieve precise sludge discharge. During the sludge discharge process, the blocking blades oscillate slightly when the machine is stopped, and clean water seeps into the sludge discharge pipe from the gaps to avoid sludge settling and clogging in the sludge discharge pipe.

[0027] This invention provides a two-stage sedimentation tank with a side sludge discharge system and a wastewater treatment method, which has the following beneficial effects:

[0028] First, this invention effectively solves the problems of numerous dead zones and low efficiency in existing secondary sedimentation tanks for sludge removal. The lateral sludge removal matrix system adopts a matrix-style design with multiple sludge removal pipes, combined with laterally inclined sludge removal ports, to achieve comprehensive coverage and collection of sludge at the bottom of the tank, avoiding the coverage limitations of traditional central sludge removal pipes. By pre-setting the area, weight, and range of motion of the blocking blades, combined with the flow compensation effect of the diversion pipes, the suction force of each laterally inclined sludge removal port is balanced, ensuring that sludge in all areas of the tank can be collected efficiently, completely eliminating dead zones for sludge removal. At the same time, the zoned controllable sludge removal mechanism can dynamically adjust the sludge removal area according to the sludge concentration. By independently controlling the opening and closing of the corresponding sludge removal pipes, precise sludge removal is achieved, reducing energy consumption while ensuring treatment effect. Compared with traditional sludge suction machines, energy consumption is significantly reduced, and the operating cost is more advantageous.

[0029] Secondly, the adoption of a non-powered scum self-separation device solves the problems of high energy consumption and incomplete separation in existing scum separation systems. The corrugated scum baffle utilizes the hydrophilicity of stainless steel to guide water flow and form a uniform thin water film. By leveraging the tension of the water film, the scum is automatically lifted and scraped away, eliminating the need for additional mechanical scrapers or air flotation systems. Scum separation can be completed with zero energy consumption, significantly reducing operating costs. The buoyancy adjustment column forms a closed-loop buoyancy control system through an anti-backflow inlet and a bottom cylindrical valve. It can dynamically adapt to water level changes, maintain a constant water level difference, and improve the device's adaptability to water flow fluctuations. It does not require disassembly and re-customization, making it more flexible. The rubber telescopic hose not only serves as a limiter but also generates a restoring force through deformation, ensuring that the non-powered scum self-separation device is always in the optimal working position. The scum separation efficiency and stability are significantly improved. The rounded corner design of the buoyancy adjustment column avoids the problem of the device getting stuck at the edge of the pool and unable to reset.

[0030] Furthermore, the integrated maintenance system design completely solves the problems of easy clogging and inconvenient maintenance of existing sludge discharge pipes. Through the linkage between the wire and the baffle blades, when the sludge discharge system is shut down, simply pulling the wire via the external maintenance control unit will lift the baffle blades upwards, causing the clean water inside the sludge discharge pipe to flow and flush, achieving self-cleaning of the sludge discharge pipe and effectively preventing clogging caused by sludge sedimentation and solidification, thus extending the service life of the pipe. During maintenance, there is no need for manual entry into the pool bottom; the working status of each lateral inclined sludge discharge port can be clearly observed by strong light. For clogged lateral inclined sludge discharge ports, only the baffle plate needs to be removed, cleaned, and reinstalled. The operation is simple and quick, avoiding process interruptions caused by traditional maintenance methods and significantly improving the convenience of equipment maintenance and the continuity of operation.

[0031] Furthermore, the various system modules of this invention have a reasonable structural design and strong compatibility. The independent valve control of the lateral sludge discharge matrix system and the dynamic water level adjustment of the non-powered scum self-separation device work together to ensure the stable operation of the entire treatment process. The overall structure of the device is highly modular, and the installation and maintenance are convenient. The number of sludge discharge pipes and the size of the corrugated scum baffle can be flexibly adjusted according to different treatment scales. It is suitable for various urban sewage and industrial wastewater treatment scenarios, has a wide range of applications, and has good practicality and promotion value. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the main view of the invention;

[0033] Figure 2 For this invention Figure 1 Enlarged view of point A in the middle;

[0034] Figure 3 This is a top view of the invention;

[0035] Figure 4 This is an enlarged schematic diagram of the lateral sludge discharge matrix system of the invention;

[0036] Figure 5 This is an enlarged schematic diagram of the non-powered scum self-separation device of the invention.

[0037] In the diagram: 1. Tank body; 2. Lateral sludge discharge matrix system; 21. Sludge discharge pipe; 22. Drive motor; 23. Independent control valve; 24. Laterally inclined sludge discharge port; 25. Baffle; 26. Circular ring; 27. Barrier blade; 28. Diversion pipe; 3. Non-powered scum self-separation device; 31. Corrugated scum baffle; 32. Buoyancy adjustment column; 33. Telescopic hose. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] 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 the invention 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 the invention. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Please see Figures 1 to 5 A secondary sedimentation tank with a lateral sludge discharge system includes a tank body 1, a lateral sludge discharge matrix system 2, a non-powered scum self-separation device 3, and an integrated maintenance system.

[0042] The interior of tank 1 is divided into a sedimentation zone, a scum separation zone and a clear water outlet zone. The sedimentation zone is located at the bottom of tank 1, the scum separation zone is located above the sedimentation zone, and the clear water outlet zone is connected to the scum separation zone through a pipe.

[0043] The lateral sludge discharge matrix system 2 is installed at the bottom of the sedimentation tank. The lateral sludge discharge matrix system 2 includes multiple sludge discharge pipes 21 arranged in a matrix. Each sludge discharge pipe 21 has an independent control valve 23 at one end near the drive motor 22. Multiple laterally inclined sludge discharge ports 24 are opened at a preset distance between the middle of the side of the sludge discharge pipe 21 and the bottom of the tank. A baffle 25 is provided at the laterally inclined sludge discharge port 24. The baffle 25 is fastened with a blocking blade 27 by two rings 26. The blocking blade 27 can swing within a preset range of motion. The sludge discharge pipes 21 are connected by a diversion pipe 28, which is used to balance the suction and flow rate of each sludge discharge port.

[0044] The non-powered scum self-separation device 3 is installed in the scum separation area. The non-powered scum self-separation device 3 includes a circumferential corrugated scum baffle 31, a buoyancy adjustment column 32, and a bottom telescopic hose 33. The corrugated scum baffle 31 is made of thin stainless steel plate. The buoyancy adjustment column 32 integrates an anti-backflow inlet and a bottom cylindrical valve to form a closed-loop buoyancy control system. The farthest corner of the buoyancy adjustment column 32 is rounded. The telescopic hose 33 is made of rubber and is used to limit the range of motion of the separation device and provide a restoring force. The integrated maintenance system includes a maintenance control unit and multiple wires. One end of each wire is connected to the corresponding barrier leaf 27, and the other end extends to the outside of the pool body 1 and is linked with the maintenance control unit.

[0045] The integrated maintenance system works in conjunction with the lateral sludge discharge matrix system 2.

[0046] A wastewater treatment method with a two-stage sedimentation tank featuring a side sludge discharge system includes the following specific steps:

[0047] S1. After flocculation treatment, the wastewater is introduced into the sedimentation zone of tank 1, where large molecular pollutants settle. The sludge formed by the sedimentation is discharged through the lateral sludge discharge matrix system 2. The specific process of the lateral sludge discharge matrix system 2 is as follows:

[0048] After the drive motor 22 is started, the blocking blades 27 at the laterally inclined mud discharge port 24 open inward. By pre-setting the area, weight and range of motion of the blocking blades 27, the suction force of each laterally inclined mud discharge port 24 is balanced.

[0049] When the sludge discharge pipe 21 is too long, the suction and flow rate of the lateral inclined sludge discharge port 24 at the end are supplemented by the diversion pipe 28 to ensure that the sludge in the sedimentation zone is collected without dead corners. The sludge is discharged from the tank body 1 through the sludge discharge pipe 21. The lateral sludge discharge matrix system 2 adopts a zoned controllable sludge discharge mechanism. According to the sludge concentration distribution data in the sedimentation zone, the sludge discharge pipe 21 in the corresponding area is dynamically opened and closed by the independent control valve 23 to achieve precise sludge discharge. During the sludge discharge process, the blocking blade 27 swings slightly when the machine is stopped, and clean water seeps into the sludge discharge pipe 21 from the gap to avoid sludge sedimentation and blockage in the sludge discharge pipe 21.

[0050] S2. The supernatant flows to the scum separation zone and the scum is separated from the water by the non-powered scum self-separation device 3. When the supernatant flows through the corrugated scum baffle 31, the hydrophilicity of the stainless steel plate forms a uniform thin water film. Under the action of water film tension, the scum is lifted by the cutting edge of the corrugated scum baffle 31 and scraped off the water surface, and accumulates above the cutting edge.

[0051] The buoyancy regulating column 32 dynamically adjusts the water level according to the buoyancy of the water in the pool through the anti-backflow inlet and the bottom cylindrical valve to maintain a constant water level difference. The telescopic hose 33 generates a restoring force through deformation to ensure the stable operation of the non-powered scum self-separation device 3.

[0052] S3. The clear water after separating the scum is discharged through the clear water discharge area;

[0053] S4. Regularly perform self-cleaning maintenance on the side sludge discharge matrix system 2 using the integrated maintenance system. The maintenance process of the integrated maintenance system is as follows:

[0054] When the sludge discharge system stops working, the maintenance control unit pulls the wire, which drives the blocking blade 27 to rise, causing the clean water in the sludge discharge pipe 21 to flow and flush, thus completing the self-cleaning of the sludge discharge pipe 21.

[0055] Repeat this operation periodically to prevent sludge from settling and clogging the sludge discharge pipe 21;

[0056] During maintenance, the working status of the lateral inclined sludge discharge port 24 can be observed by shining a strong light on it. If the lateral inclined sludge discharge port 24 is blocked, it is only necessary to remove the baffle 25, clean it, and then reinstall it.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A two-stage settling tank with a lateral sludge discharge system, characterized in that, It includes the pool body (1), the lateral sludge discharge matrix system (2), the non-powered scum self-separation device (3), and the integrated maintenance system; The pool body (1) is divided into a sedimentation zone, a scum separation zone and a clear water outlet zone. The sedimentation zone is located at the bottom of the pool body (1), the scum separation zone is located above the sedimentation zone, and the clear water outlet zone is connected to the scum separation zone through a pipe. The lateral sludge discharge matrix system (2) is installed at the bottom of the sedimentation tank, and the non-powered scum self-separation device (3) is installed in the scum separation zone. The integrated maintenance system is linked with the lateral sludge discharge matrix system (2).

2. The secondary sedimentation tank with a lateral sludge discharge system according to claim 1, characterized in that, The lateral sludge discharge matrix system (2) includes multiple matrix-distributed sludge discharge pipes (21). Each sludge discharge pipe (21) has an independent control valve (23) at one end near the drive motor (22). Multiple laterally inclined sludge discharge ports (24) are opened at a preset distance between the middle of the side of the sludge discharge pipe (21) and the bottom of the pool. A baffle (25) is provided at the laterally inclined sludge discharge port (24). A blocking blade (27) is fastened to the baffle (25) by two rings (26). The blocking blade (27) can swing within a preset range of motion. The sludge discharge pipes (21) are connected by a diversion pipe (28). The diversion pipe (28) is used to balance the suction and flow rate of each sludge discharge port.

3. The secondary sedimentation tank with a lateral sludge discharge system according to claim 1, characterized in that, The non-powered scum self-separation device (3) includes a circumferential corrugated scum baffle (31), a buoyancy adjustment column (32), and a bottom telescopic hose (33). The corrugated scum baffle (31) is made of thin stainless steel plate. The buoyancy adjustment column (32) integrates an anti-backflow inlet and a bottom cylindrical valve to form a closed-loop buoyancy control system. The farthest corner of the buoyancy adjustment column (32) is rounded. The telescopic hose (33) is made of rubber and is used to limit the range of motion of the separation device and provide a restoring force. The integrated maintenance system includes a maintenance control unit and multiple wires. One end of each wire is connected to the corresponding barrier leaf (27), and the other end extends to the outside of the pool body (1) and is linked with the maintenance control unit.

4. A wastewater treatment method for a secondary sedimentation tank with a lateral sludge discharge system as described in claims 1 to 3, characterized in that, The specific steps include the following: S1. After flocculation treatment, the wastewater is introduced into the sedimentation zone of the tank (1). In the sedimentation zone, the macromolecular pollutants are settled, and the sludge formed by the sedimentation is discharged by the lateral sludge discharge matrix system (2). S2. The supernatant flows to the scum separation zone and the scum is separated from the water body by the non-powered scum self-separation device (3). S3. The clear water after separating the scum is discharged through the clear water discharge area; S4. Regularly perform self-cleaning maintenance on the lateral sludge discharge matrix system (2) through the integrated maintenance system.

5. The wastewater treatment method according to claim 4, characterized in that, The specific process of the lateral sludge discharge matrix system (2) is as follows: After the drive motor (22) is started, the blocking blades (27) at the laterally inclined sludge discharge port (24) open inward. The suction force of each laterally inclined sludge discharge port (24) is balanced by the area, weight and range of motion of the preset blocking blades (27). When the sludge discharge pipe (21) is too long, the suction and flow of the lateral sludge discharge port (24) at the end are supplemented by the diversion pipe (28) to ensure that the sludge in the sedimentation zone is collected without dead corners and the sludge is discharged from the tank body (1) through the sludge discharge pipe (21).

6. The wastewater treatment method according to claim 4, characterized in that, The working process of step S2 is as follows: When the supernatant flows through the corrugated scum baffle (31), it forms a uniform thin water film by utilizing the hydrophilicity of the stainless steel plate. Under the action of water film tension, the scum is lifted by the cutting edge of the corrugated scum baffle (31) and scraped off the water surface, accumulating above the cutting edge. The buoyancy regulating column (32) dynamically adjusts the water level according to the buoyancy of the water in the pool through the anti-backflow inlet and the bottom cylindrical valve, maintaining a constant water level difference. The telescopic hose (33) generates a restoring force through deformation, ensuring the stable operation of the non-powered scum self-separation device (3).

7. The wastewater treatment method according to claim 4, characterized in that, The maintenance process of the integrated maintenance system is as follows: When the sludge discharge system stops working, the maintenance control unit pulls the wire, which drives the blocking blade (27) to rise, so that the clean water in the sludge discharge pipe (21) flows and flushes, completing the self-cleaning of the sludge discharge pipe (21); Repeat this operation periodically to prevent sludge from settling and clogging the sludge discharge pipe (21); During maintenance, the working status of the lateral inclined sludge discharge port (24) can be observed by strong light. If the lateral inclined sludge discharge port (24) is blocked, it is only necessary to remove the baffle (25), clean it, and then reinstall it.

8. The wastewater treatment method according to claim 4, characterized in that, The lateral sludge discharge matrix system (2) adopts a zoned controllable sludge discharge mechanism. Based on the sludge concentration distribution data in the sedimentation zone, the sludge discharge pipe (21) of the corresponding area is dynamically opened and closed by the independent control valve (23) to achieve precise sludge discharge. During the sludge discharge process, the blocking blade (27) swings slightly when the machine is stopped, and clean water seeps into the sludge discharge pipe (21) from the gap, avoiding sludge sedimentation and blockage in the sludge discharge pipe (21).

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