Self-cleaning overflow plate of sewage secondary sedimentation tank

Abstract

The invention belongs to the field of sewage treatment equipment, and discloses a self-cleaning overflow plate of a sewage secondary sedimentation tank, which comprises an overflow plate shell of a stainless steel hollow shell, a special-shaped overflow plate of an approximate regular triangle hollow stainless steel structure, a motor, a nylon wire, an overflow plate base, a spring cabin and the like. The special-shaped overflow plate is provided with a small protruding overflow piece which can filter impurities and extrude the spring; the motor is mounted at the top of the shell, water flow stagnation time is prolonged during working, and impurities are shaken off; a spring is arranged in the spring cabin, and sewage pushes a spring cover to enable the spring to rebound to impact impurities; the nylon wire is connected with a motor rotating shaft and can cut and smash impurities. The overflow plate works in the water flow direction, realizes self-cleaning in multiple modes, improves the treatment efficiency of the secondary sedimentation tank, ensures the effluent quality and stable operation of the system, reduces manual cleaning, and is suitable for the field of sewage treatment.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment, and more particularly to a self-cleaning overflow plate for a secondary sedimentation tank. Background Technology

[0002] In the field of wastewater treatment, secondary sedimentation tanks play a crucial role. They are typically located after biological treatment structures (such as activated sludge or biofilm treatment units) and are the final key step in the biological wastewater treatment process. The main function of the secondary sedimentation tank is to separate sludge from water, clarifying the biologically treated mixture, effectively separating activated sludge or humic sludge from the treated water, and simultaneously concentrating the sludge in the mixture to provide a certain concentration of return sludge for the biological treatment facility, ensuring the normal operation of the biological treatment system and good treatment results.

[0003] The overflow plate is a key component in the operation of a secondary sedimentation tank. Traditional overflow plates in secondary sedimentation tanks typically employ structures such as sawtooth weirs, their function being to evenly collect the clarified water from the upper part of the tank and introduce it into subsequent treatment processes or discharge it directly. However, in actual operation, traditional overflow plates have numerous problems, severely impacting the treatment efficiency of the secondary sedimentation tank and the quality of the effluent.

[0004] Toothed overflow plates are commonly used to control wastewater discharge and are made of sheet metal or other metals and alloys. Laboratory overflow plates are typically made of lightweight materials such as plexiglass or fiberglass (plastic). Weir plates (overflow plates) are a common water-passing structure in water treatment processes. When the water level is below the weir crest, water does not flow; in this case, the weir only serves to impede water flow. If water continues to flow from upstream (or the previous process), the weir raises the upstream water level.

[0005] However, in daily production operations, the wastewater in the sewage tank is complex and rich in impurities, commonly including plankton, branches, sticks, hair, sludge, and bubbles. Although these are treated by the front-end treatment process, the dynamic addition of various chemicals to adjust various indicators during actual operation inevitably affects eutrophication, leading to the excessive growth of aquatic plants such as algae and moss, and the clumping of impurities in the wastewater. Ultimately, due to insufficient kinetic energy, these impurities adhere to the toothed overflow plate in the sewage tank. In sewage treatment plants, especially in summer, frequent manual removal is often required. This is a common problem in practical engineering applications, and in severe cases, it may cause backflow, affecting the operation of the secondary sedimentation tank and even directly impacting the effluent quality and the concentration of returned sludge, thus affecting the overall sewage treatment effect, reducing treatment efficiency, and increasing operating costs. The currently used manual removal method is not a convenient solution, and there is an urgent need for a self-cleaning overflow plate for secondary sewage sedimentation tanks.

[0006] Currently, while there is some research on wastewater treatment equipment and sedimentation tanks, research on the self-cleaning function of overflow plates in secondary sedimentation tanks is relatively limited. Most studies focus on optimizing the overall structure of sedimentation tanks and sludge treatment technologies, without giving sufficient attention to the improvement and innovation of the overflow plate, a key component. For example, some new sedimentation tanks employ inclined plate (tube) sedimentation and high-efficiency flocculation technologies to improve sedimentation efficiency, but these technologies do not directly address the problem of impurities easily adhering to the overflow plate surface and affecting water flow distribution. Summary of the Invention

[0007] To address the problem that existing overflow plates in sedimentation tanks of wastewater treatment plants often require frequent manual removal of residues, this invention provides a self-cleaning overflow plate for secondary sedimentation tanks in wastewater treatment plants.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A self-cleaning overflow plate for a secondary sedimentation tank for wastewater includes the following structure: The overflow plate outer shell is a hollow shell made of stainless steel, and the internal space is used to house the electrical control structure, which is welded to the irregularly shaped overflow plate. The irregularly shaped overflow plate is a hollow stainless steel structure with an outer shape that is similar to an equilateral triangle. Its larger two side surfaces have protruding overflow pieces with openings opposite to the direction of water flow. The motor, along with its associated circuitry, is mounted on the top of the overflow plate housing and is connected to the sludge scraper in the pool via wires, with its switch controlled by the existing electrical control system. The nylon cable is directly connected to the shafts at both ends of the motor. Overflow plate base, used to fix the overflow plate to the wall of the secondary sedimentation tank; The spring chamber contains small, sensitive springs. A spring cover is provided on the side in contact with sewage. The springs are evenly distributed around the overflow plate and penetrate the irregularly shaped overflow plate.

[0009] Furthermore, the overflow plate filters out some impurities by blocking the sewage path, and uses the blocked sewage to work on the spring cover on the surface of the spring chamber, thereby compressing the spring.

[0010] Furthermore, when the motor is working, it increases the stagnation time of the water flow at the contact surface and shakes some of the debris back into the sewage tank through the vibration of the motor.

[0011] Furthermore, when the sewage pushes the spring cover, the spring inside the spring chamber does work to the outer chamber and then rebounds to the inner chamber, impacting the sewage inside and causing impurities such as branches, leaves, and weeds in the sewage pool to bounce off.

[0012] Furthermore, the lengths of the rotating shafts at both ends of the motor are exactly tangential to the spring chamber when it is working. When the motor is working, the nylon thread rotates to cut and break up impurities such as floating mud, bubbles, and algae in the pool, so that the impurities return to the sedimentation tank.

[0013] Furthermore, the overflow plate outer shell and the irregular overflow plate are connected by welding to ensure a firm connection and good sealing.

[0014] Furthermore, the overflow shards are evenly distributed on the larger two sides of the irregularly shaped overflow plate, and the opening direction is opposite to the water flow direction to achieve the best blocking and cleaning effect.

[0015] Furthermore, the spring chambers are evenly distributed around the overflow plate to ensure that impurities in different locations can be effectively impacted and bounced away.

[0016] Furthermore, the overflow plate base is fixed to the wall of the secondary sedimentation tank with nuts, and the fixing position and angle can be adjusted according to actual installation requirements.

[0017] Furthermore, when the sewage tank is working normally, the hollow stainless steel structure of the irregularly shaped overflow plate prevents impurities from sticking to the wall by utilizing the water flow direction in the secondary sedimentation tank. The overflow plate blocks the sewage, generates water splashes to clean and squeeze the spring. The spring rebounds and hits the impurities, which are then bounced away to the working point of the nylon wire. The motor rotates the nylon wire to cut and break up the impurities, causing them to return to the sedimentation tank.

[0018] Compared with the prior art, the beneficial effects of the present invention include: This invention features interconnected special structures on an irregularly shaped overflow plate, enabling the overflow plate to have a self-cleaning function during use. When self-cleaning is insufficient, it can also actively initiate a cleaning operation. It has good corrosion resistance and a long service life, and can conveniently replace the currently commonly used method of manually retrieving the overflow plate, thereby improving the efficiency of wastewater treatment in the system.

[0019] (1) Strong self-cleaning ability: Traditional overflow plates are prone to adhering to algae and other impurities. The hollow structure of the irregular overflow plate of this invention can prevent it from sticking to the wall. The overflow small piece blocks the sewage to generate water splashes for cleaning. It can also squeeze the spring to make the sewage hit and bounce off the impurities. With the help of the motor, the nylon wire cutter breaks up the impurities, achieving comprehensive self-cleaning and reducing the frequency and labor intensity of manual cleaning.

[0020] (2) Improve processing efficiency: Motor vibration can increase the water flow stagnation time, allowing impurities more time to settle or be processed; the impact of the spring chamber can promptly bounce off impurities, preventing them from affecting the water flow and sedimentation effect, thereby improving the mud-water separation efficiency of the secondary sedimentation tank.

[0021] (3) Ensure the quality of effluent: Through various self-cleaning methods, it effectively reduces the entry of impurities into subsequent treatment processes or effluent, reduces the content of suspended solids in effluent, and makes the effluent quality more stable and the compliance rate higher.

[0022] (4) Stable operation: No need for frequent shutdowns for manual cleaning, ensuring the continuous and stable operation of the secondary sedimentation tank and the entire sewage treatment system. Attached Figure Description

[0023] Figure 1 Main view; Figure 2 This is a structural diagram of the overflow plate section; Figure 3 Side view of the overflow plate; Figure 4 Diagram showing the connection of multiple overflow plates; Figure 5 Left view of the overflow plate; Figure 6 This is a structural diagram of the spring cabin.

[0024] The attached diagram is labeled as follows: 1. Overflow plate housing, 2. Irregularly shaped overflow plate, 3. Motor, 4. Nylon line, 5. Overflow plate base, 6. Overflow piece, 7. Spring chamber. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] Example 1 A self-cleaning overflow plate for a secondary sedimentation tank for sewage includes an overflow plate shell 1, an irregularly shaped overflow plate 2, a motor 3, a nylon line 4, an overflow plate base 5, an overflow small piece 6, and a spring chamber 7.

[0028] The overflow plate outer shell 1 is a hollow shell made of stainless steel, and the internal space can accommodate the electrical control structure required by this invention. It is welded to the irregularly shaped overflow plate 2.

[0029] The irregular overflow plate 2 is a hollow stainless steel structure with an approximate equilateral triangle shape. The larger two side surfaces are provided with protruding overflow pieces 6 with openings opposite to the water flow direction. The overflow pieces 6 can filter out some impurities by blocking the sewage path and use the blocked sewage to work on the spring cover on the surface of the spring chamber 7, thereby compressing the spring.

[0030] Motor 3 and related circuits are installed on the top of overflow plate housing 1. They are connected to the sludge scraper in the pool via wires and controlled by the original electrical control system. When motor 3 is working, it increases the stagnation time of water flow at the contact surface and shakes some debris back into the sewage pool through the vibration of motor 3.

[0031] The spring chamber 7 has a built-in small sensitive spring, and a spring cover is provided on the side that contacts the sewage. The spring covers are evenly distributed around the small pieces of overflow plate 8. The spring chamber 7 passes through the irregularly shaped overflow plate 2. When the sewage pushes the spring cover, the built-in spring does work to the outer chamber and then rebounds to the inner chamber, impacting the sewage inside. This causes impurities such as branches, leaves and weeds in the sewage pool to bounce off.

[0032] The nylon line 4 is directly connected to the two ends of the motor 3 shaft. The length of this shaft is exactly the same as the working surface of the spring chamber 7. When the motor 3 is working, the nylon line 4 rotates. The fast-moving cutting operation can cut and break up impurities such as floating mud, bubbles, and algae in the pool and return them to the sedimentation tank.

[0033] The overflow plate base 5 is fixed to the wall of the secondary sedimentation tank with nuts.

[0034] When the sewage tank is working normally, even after filtering impurities through the front-end screen, it is difficult to avoid the presence of impurities such as small branches, leaves, weeds, floating mud, bubbles, and algae in the secondary sedimentation tank. This invention utilizes the water flow direction in the secondary sedimentation tank. The hollow stainless steel structure of the irregularly shaped overflow plate 2 can effectively prevent impurities from sticking to the wall. After the overflow small piece 6 blocks the sewage, it firstly generates water splashes to achieve cleaning, and secondly, it uses the blocked sewage to work on the spring cover on the surface of the spring chamber 7. After squeezing the spring, it impacts the sewage on the side. This impact only needs to bounce the impurities that are about to stick to the wall to the working point of the nylon line 4. The motor 3 rotates the nylon line 4 to quickly cut and break it up and return it to the sedimentation tank.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A self-cleaning overflow plate for a secondary sedimentation tank of sewage, characterized in that, include: The overflow plate outer shell (1) is a hollow shell made of stainless steel, and the internal space is used to house the electrical control structure; The irregular overflow plate (2) is a hollow stainless steel structure with an outer shape similar to an equilateral triangle. Its larger two side surfaces are provided with protruding overflow pieces (6) with openings opposite to the water flow direction. The motor (3) and related circuits are installed on the top of the overflow plate housing (1), connected to the sludge scraper in the pool via wires and controlled by the switch in the original electrical control system; The nylon wire (4) is directly connected to the two ends of the motor (3) shaft; Overflow plate base (5) is used to fix the overflow plate to the wall of the secondary sedimentation tank; The spring chamber (7) has a built-in small sensitive spring and a spring cover on the side in contact with sewage. The spring cover is evenly distributed around the overflow plate and penetrates the irregular overflow plate (2).

2. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to claim 1, characterized in that, The overflow piece (6) filters out some impurities by blocking the sewage path, and uses the blocked sewage to work on the spring cover on the surface of the spring chamber (7), thereby squeezing the spring.

3. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to claim 1, characterized in that, When the motor (3) is working, it increases the stagnation time of the water flow at the contact surface and shakes some of the debris back into the sewage tank through the vibration of the motor (3).

4. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to claim 1, characterized in that, When the sewage pushes the spring cover, the spring inside the spring chamber (7) does work to the outer chamber and then rebounds to the inner chamber, impacting the sewage inside and causing impurities such as branches, leaves and weeds in the sewage pool to bounce off.

5. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to claim 1, characterized in that, The length of the shafts at both ends of the motor (3) is exactly the same as the working surface of the spring chamber (7). When the motor (3) is working, the nylon line (4) rotates to cut and break up the floating mud, bubbles, algae and other impurities in the pool, so that the impurities return to the sedimentation tank.

6. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to claim 1, characterized in that, The overflow plate shell (1) and the irregular overflow plate (2) are connected by welding to ensure a firm connection and good sealing.

7. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to claim 1, characterized in that, The overflow pieces (6) are evenly distributed on the larger two sides of the irregular overflow plate (2), and the opening direction is opposite to the water flow direction to achieve the best blocking and cleaning effect.

8. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to claim 1, characterized in that, The spring chamber (7) is evenly distributed around the overflow plate (6) to ensure that impurities at different locations can be effectively impacted and bounced away.

9. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to claim 1, characterized in that, The overflow plate base (5) is fixed to the wall of the secondary sedimentation tank by nuts, and the fixing position and angle can be adjusted according to actual installation requirements.

10. The self-cleaning overflow plate for a secondary sedimentation tank of wastewater according to any one of claims 1-9, characterized in that, When the sewage tank is working normally, the hollow stainless steel structure of the irregular overflow plate (2) prevents impurities from sticking to the wall by utilizing the water flow direction in the secondary sedimentation tank. The overflow small piece (6) blocks the sewage to generate water splashes to clean and squeeze the spring. The spring rebounds and hits the impurities, which are bounced away to the working point of the nylon line (4). The motor (3) rotates the nylon line (4) to cut and break the impurities so that they return to the sedimentation tank.

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