Anti-fouling combined sewer overflow pollution detention tank, combined sewer treatment system and method

Abstract

This invention relates to the field of overflow pollution control technology for urban drainage systems, specifically to a combined sewer overflow pollution storage tank, a combined sewage treatment system, and a method for preventing siltation. The system includes a tank body and an ultrasonic anti-siltation system. The tank body is equipped with an inlet pipe and drainage facilities. The ultrasonic anti-siltation system includes multiple ultrasonic transducers. The bottom of the tank body has mounting holes corresponding to the ultrasonic transducers, and each ultrasonic transducer is embedded in its corresponding mounting hole. A flexible sealant is filled between the sidewall of the ultrasonic transducer and the inner wall of the mounting hole. This invention utilizes the cavitation and mechanical vibration effects induced by the ultrasonic transducers to continuously agitate the water, keeping solid particles suspended and fundamentally preventing solid particles from settling and accumulating at the bottom of the tank. Furthermore, embedding the ultrasonic transducers at the bottom of the tank improves acoustic energy utilization efficiency and extends the service life of the equipment. The gaps between the ultrasonic transducers and the mounting holes are filled with a flexible sealant, which is both waterproof and absorbs micro-vibrations.

Description

Technical Field

[0001] This invention relates to the field of overflow pollution control technology for urban drainage systems, specifically to an anti-siltation combined sewer overflow pollution storage tank, a combined sewage treatment system, and a method. Background Technology

[0002] Combined sewer overflow pollution occurs when rainfall exceeds the carrying capacity of combined sewer systems. Combined sewer overflow pollution is a significant component of urban non-point source pollution and a key cause of eutrophication and black / odorous water bodies. Untreated overflows discharged into receiving water systems pose a major threat to the urban water environment.

[0003] To prevent combined sewer overflow pollution, a combined sewer overflow storage tank is installed to store overflowing wastewater. After rainfall, the wastewater in the storage tank is discharged using a submersible pump, thus preventing overflow pollution. This process causes some suspended solids to settle at the bottom of the combined sewer overflow storage tank, which needs to be cleaned promptly after rain.

[0004] Common cleaning methods for combined sewer overflow pollution storage tanks include flushing gates, jet flushing, and manual cleaning. The flushing gate method requires dividing the storage tank into several units for separate flushing. To ensure the airtightness of the flushing gates, the water level in the storage chamber is limited, and the accumulated water can only be flushed once. If the silt is too much or too thick, it is difficult to clean it thoroughly, eventually leading to the loss of the storage tank's function and its eventual abandonment. Jet flushing motors or hydraulic systems have cleaning dead zones, high energy consumption, and relatively difficult maintenance in case of failure. Manual sludge removal is labor-intensive, hazardous, and difficult due to the fact that storage tanks are mostly built underground. Summary of the Invention

[0005] The purpose of this invention is to provide a combined sewer overflow pollution storage tank, a combined sewage treatment system and method to prevent siltation, which can at least solve some of the defects in the prior art.

[0006] To achieve the above objectives, the technical solution of the present invention is a combined sewer overflow pollution storage tank for preventing siltation, comprising a tank body, wherein the tank body is provided with an inlet pipe for receiving combined sewer overflow sewage and a drainage facility for discharging sewage from the tank body; it also includes an ultrasonic anti-siltation system, wherein the ultrasonic anti-siltation system includes multiple ultrasonic transducers, and the bottom of the tank body is provided with mounting holes corresponding to the ultrasonic transducers, wherein each ultrasonic transducer is embedded in the corresponding mounting hole, and the space between the side wall of the ultrasonic transducer and the inner wall of the mounting hole is filled with a flexible sealant.

[0007] As one implementation method, the effective ranges of adjacent ultrasonic transducers are connected or partially overlap, and the effective range of the ultrasonic anti-sludge system covers the bottom of the pool.

[0008] As one implementation method, the top surface of the ultrasonic transducer plate is an ultrasonic radiation surface and is flush with the top surface of the pool bottom.

[0009] As one embodiment, a steel plate is pre-embedded outside the pool body, the bottom of the ultrasonic transducer is fixed on the steel plate, and a rubber shock-absorbing pad is provided between the ultrasonic transducer and the steel plate.

[0010] As one implementation method, the bottom of the pool is partially recessed to form a water storage tank, and the drainage facility is installed in the water storage tank; except for the area where the water storage tank is located, the top surface of the pool bottom is provided with a drainage slope that slopes downward toward the water storage tank.

[0011] As one implementation method, the ultrasonic anti-sludge system also includes an ultrasonic controller, which is located at the top of the pool body, and each of the ultrasonic transducers is electrically connected to the ultrasonic controller.

[0012] As one embodiment, multiple level gauges are arranged at intervals along the vertical direction in the pool body, and each level gauge is electrically connected to the ultrasonic controller.

[0013] The present invention also provides a combined sewage treatment system, including a sewage treatment plant, and further including the anti-siltation combined overflow pollution storage tank as described in any of the above, wherein the inlet pipe is connected to the overflow outlet of the combined sewage overflow well, and the drainage facility is connected to the sewage treatment plant.

[0014] The present invention also provides a method for treating combined sewage, using the combined sewage treatment system described above, the method comprising the following steps:

[0015] Combined sewage overflowing from the combined sewage overflow well is introduced into the tank through the inlet pipe. When the water level in the tank reaches the set threshold, the ultrasonic anti-sludge system is activated. The high-frequency vibration generated by the ultrasonic transducer propagates in the water, causing a strong cavitation effect and mechanical vibration effect, so that the solid suspended particles in the sewage are always in a suspended state.

[0016] After the rainfall ends, the sewage in the pool is pumped to the sewage treatment plant through the drainage facilities; after the sewage in the pool is basically emptied, the ultrasonic anti-sludge system is turned off.

[0017] As one implementation method, after the ultrasonic anti-sludge system is started and before it is turned off, the ultrasonic transducer is controlled to run intermittently by the ultrasonic controller, and the starting position, vibration frequency, operating power and intermittent operation time interval of the ultrasonic transducer are dynamically adjusted according to the water level in the pool.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] (1) This invention utilizes the cavitation effect and mechanical vibration effect caused by the ultrasonic waves generated by the ultrasonic transducer when they propagate in the liquid to continuously disturb the water in the tank, keeping solid particles in a suspended state, fundamentally preventing solid particles from settling and accumulating at the bottom of the tank, ensuring the continuous and efficient operation of the combined overflow pollution storage tank, and embedding the ultrasonic transducer at the bottom of the tank can improve the efficiency of sound energy utilization, while avoiding long-term full-area immersion in sewage, thus extending the service life of the equipment.

[0020] (2) By filling the gap between the side wall of the ultrasonic transducer plate and the installation hole at the bottom of the pool with flexible material sealant, the present invention can not only prevent sewage in the pool from seeping out along the joint between the ultrasonic transducer plate and the bottom of the pool, but also absorb the micro-vibrations generated when the ultrasonic transducer plate is working, reduce the impact on the pool body, and extend the service life of the pool body.

[0021] (3) Compared with the traditional flushing door / jet flushing which has cleaning dead corners, the present invention connects or partially overlaps the effective range of adjacent ultrasonic plates, thereby ensuring that the entire bottom area of ​​the pool can be completely and uniformly covered by the ultrasonic energy field, so that particulate matter cannot be caking and deposited, eliminating the risk of siltation and any cleaning dead corners from the source.

[0022] (4) The ultrasonic transducer of the present invention adopts graded control and intermittent operation mode to achieve precise and efficient operation, low energy consumption, and the device has no complex hydraulic / motor system, resulting in a low equipment failure rate.

[0023] (5) The regulating tank of the present invention does not need to be divided into flushing units, and the volume utilization rate of the regulating tank is significantly improved; and the cavitation effect of ultrasound has a certain effect of sterilization and degradation of organic pollutants, which helps to improve the water quality of sewage in the regulating tank. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1A schematic diagram of the structure of the anti-siltation combined sewer overflow pollution storage tank provided in an embodiment of the present invention;

[0026] Figure 2 This is a diagram showing the arrangement of ultrasonic transducers on the bottom of a pool according to an embodiment of the present invention, wherein the dashed area represents the effective range of each ultrasonic transducer.

[0027] In the diagram: 10. Pool body; 11. Drainage slope; 12. Water storage tank; 20. Inlet pipe; 30. Submersible pump; 31. Outlet pipe; 40. Ultrasonic vibrating plate; 41. Ultrasonic controller; 50. Level gauge. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0029] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0030] 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 invention, unless otherwise stated, "a plurality of" means two or more.

[0031] like Figure 1As shown, this embodiment provides a combined sewer overflow pollution storage tank for preventing siltation, including a tank body 10. The tank body 10 is provided with an inlet pipe 20 for receiving combined sewer overflow sewage and a drainage facility for discharging sewage from the tank body 10. It also includes an ultrasonic anti-siltation system, which includes multiple ultrasonic transducers 40. The bottom of the tank body 10 is provided with mounting holes corresponding to the ultrasonic transducers 40. Each ultrasonic transducer 40 is embedded in the corresponding mounting hole, and the side wall of the ultrasonic transducer 40 and the inner wall of the mounting hole are filled with flexible sealant. This embodiment utilizes the cavitation effect (instantaneous high-pressure micro-jet) and mechanical vibration effect caused by the ultrasonic waves generated by the ultrasonic transducer 40 propagating in the liquid to continuously disturb the water in the tank 10, keeping solid particles in suspension. This fundamentally prevents solid particles from settling and accumulating at the bottom of the tank, greatly reducing the difficulty of sludge removal and improving the sludge removal effect. This ensures the continuous and efficient operation of the combined sewer overflow pollution storage tank. Furthermore, embedding the ultrasonic transducer 40 at the bottom of the tank can improve the efficiency of sound energy utilization and avoid long-term full-area immersion in sewage, extending the service life of the equipment. By filling the gap between the side wall of the ultrasonic transducer 40 and the installation hole at the bottom of the tank with flexible sealant, it can prevent sewage in the tank from seeping out along the joint between the ultrasonic transducer 40 and the bottom of the tank, and also absorb the micro-vibrations generated by the ultrasonic transducer 40 during operation, reducing the impact on the tank 10 and extending the service life of the tank 10.

[0032] In this embodiment, the mounting holes on the bottom of the pool extend along the thickness direction of the pool bottom, and the ultrasonic transducer plate 40 is firmly embedded in the corresponding mounting holes. The top surface of the ultrasonic transducer plate 40, i.e. the ultrasonic radiation surface, faces the inside of the pool body 10, ensuring that the ultrasonic energy is directly radiated into the water in the pool. The bottom of the ultrasonic transducer plate 40 is located outside the pool body 10, which facilitates the cable to be led out from outside the pool body 10.

[0033] Preferably, the effective ranges of adjacent ultrasonic transducers 40 are connected or partially overlap, and the effective range of the ultrasonic anti-sludge system covers the bottom of the pool. For example... Figure 2 As shown, by connecting or partially overlapping the effective ranges of adjacent ultrasonic transducers 40, the entire bottom area of ​​the pool is ensured to be completely and uniformly covered by the ultrasonic energy field, eliminating any cleaning dead zones. Multiple ultrasonic transducers 40 can be evenly distributed, or the number and distribution of ultrasonic transducers 40 can be adjusted according to actual needs. The spacing between adjacent ultrasonic transducers 40 should also meet the needs of personnel walking.

[0034] Preferably, the top surface of the ultrasonic transducer plate 40 is the ultrasonic radiation surface and is flush with the top surface of the pool bottom. By keeping the top surface of the ultrasonic transducer plate 40 flush with the top surface of the pool bottom, it is possible to avoid the formation of new siltation points or obstruction of water flow due to the ultrasonic transducer plate 40 protruding or recessed.

[0035] In some embodiments, a steel plate is pre-embedded outside the pool body 10, the bottom of the ultrasonic transducer 40 is fixed to the steel plate, and a rubber damping pad is provided between the ultrasonic transducer 40 and the steel plate. By pre-embedding a steel plate in the bottom or side wall of the pool body 10, extending below the pool body 10, it serves as the mounting base for the ultrasonic transducer 40; the bottom of the ultrasonic transducer 40 is fixed to the steel plate, and a rubber damping pad is provided between the ultrasonic transducer 40 and the steel plate. The rubber damping pad absorbs the high-frequency mechanical vibration generated by the ultrasonic transducer 40 during operation, reducing the transmission of vibration energy to the pool body 10 and its surroundings. Further, the thickness of the rubber damping pad is 5~10 mm. Specifically, the bottom of the ultrasonic transducer plate 40 and the rubber damping pad have corresponding mounting holes. By passing stainless steel anchors through the mounting holes on the bottom of the ultrasonic transducer plate 40 and the rubber damping pad, and then threading them into the pre-drilled threaded holes on the steel plate, the ultrasonic transducer plate 40 is fixed to the steel plate. A spring washer is installed between the anchor head of the stainless steel anchor and the bottom of the ultrasonic transducer plate 40 to prevent the stainless steel anchor from loosening due to long-term vibration, ensuring that the connection between the ultrasonic transducer plate 40 and the steel plate remains firm and reliable. In this embodiment, the outer shell of the ultrasonic transducer plate 40 is made of stainless steel.

[0036] In some embodiments, the bottom of the pool is partially concave to form a water storage tank 12, and the drainage facility is disposed in the water storage tank 12; the top surface of the pool bottom, except for the area where the water storage tank 12 is located, is provided with a drainage slope 11 sloping downward toward the water storage tank 12. Figure 1 As shown, the water storage tank 12 is located on the right side of the pool body 10 and is recessed downwards relative to the bottom of the pool; the drainage slope 11 extends downwards from the left side of the pool body 10 to the vicinity of the water storage tank 12, thereby guiding the water flow to converge into the water storage tank 12 and facilitating drainage. Preferably, the top surface of the ultrasonic transducer plate 40 is flush with the top surface of the drainage slope 11 to avoid the formation of new siltation points or obstruction of water flow due to the protrusion or depression of the ultrasonic transducer plate 40.

[0037] Furthermore, the drainage facility includes a submersible pump 30 and an outlet pipe 31 connected to the submersible pump 30. The submersible pump 30 is located inside or near the water storage tank 12, and the end of the outlet pipe 31 facing away from the submersible pump 30 extends out of the pool body 10.

[0038] Furthermore, the ultrasonic anti-sludge system also includes an ultrasonic controller 41, which is located on the top of the pool body 10. Each ultrasonic transducer 40 is electrically connected to the ultrasonic controller 41. The ultrasonic controller 41 is the "brain" of the ultrasonic anti-sludge system, responsible for receiving signals, processing logic, and outputting control commands. It can control the start and stop of each ultrasonic transducer 40, as well as the vibration frequency, operating power, and intermittent operation time interval of each ultrasonic transducer 40. Specifically, the ultrasonic controller 41 is located on the top outer side of the pool body 10 for easy operation and maintenance.

[0039] Furthermore, multiple level gauges 50 are vertically spaced within the pool 10, each level gauge 50 being electrically connected to the ultrasonic controller 41. Positioning the multiple level gauges 50 at different specific heights within the pool allows for real-time monitoring of the water level. The level gauges 50 transmit the monitored water level signals to the ultrasonic controller 41, which determines the current water level of the pool 10 based on the received signals and controls the operating status and parameters of the ultrasonic generator accordingly. Specifically, when a drainage slope 11 is provided at the bottom of the pool, and the top surface of the ultrasonic transducer 40 is flush with the drainage slope 11, multiple rows of ultrasonic transducers 40 are arranged at intervals along the inclined direction of the drainage slope 11. Level gauges 50 can be placed at the highest point of each row of ultrasonic transducers 40, and multiple level gauges 50 can be vertically spaced above the drainage slope 11.

[0040] Preferably, a turbidity meter is also installed inside the pool body 10, and the turbidity meter is electrically connected to the ultrasonic controller 41. The turbidity of the water in the pool can be monitored in real time by the turbidity meter. When the detected turbidity exceeds a set threshold, the ultrasonic controller 41 automatically controls the ultrasonic transducer 40 to shorten the intermittent operation time interval or increase the operating power. Specifically, the turbidity meter can be installed at the bottom of the pool body 10.

[0041] This embodiment also provides a combined sewer overflow pollution storage tank, including a sewage treatment plant and the anti-siltation combined sewer overflow pollution storage tank described in any of the above embodiments. The inlet pipe 20 is connected to the overflow outlet of the combined sewer overflow well, and the drainage facility is connected to the sewage treatment plant. By adopting the anti-siltation combined sewer overflow pollution storage tank of this embodiment, combined sewage exceeding the treatment capacity of the sewage treatment plant can be temporarily stored during rainfall, avoiding the direct discharge of untreated sewage into rivers and causing pollution. After the rainfall or when the sewage treatment plant has sufficient treatment capacity, the temporarily stored sewage is then transported to the sewage treatment plant for treatment to meet standards. At the same time, the ultrasonic anti-siltation system configured in the anti-siltation combined sewer overflow pollution storage tank can effectively inhibit the settling and accumulation of solid particles at the bottom of the tank, ensuring the effective operation of the storage tank during long-term use.

[0042] This embodiment also provides a combined sewage treatment method, which uses the combined sewage treatment system described above, and the method includes the following steps:

[0043] The combined sewage overflowing from the combined sewage overflow well is introduced into the tank 10 through the inlet pipe 20. When the water level in the tank reaches the set threshold, the ultrasonic anti-sludge system is activated. The high-frequency vibration generated by the ultrasonic transducer 40 propagates in the water, causing a strong cavitation effect and mechanical vibration effect, so that the solid suspended particles in the sewage are always in a suspended state.

[0044] After the rainfall ends, the sewage in pool 10 will be pumped to the sewage treatment plant through the drainage facilities; after the sewage in pool 10 is basically emptied, the ultrasonic anti-sludge system will be turned off.

[0045] After the combined sewer overflow enters the tank 10, the water level in the tank 10 gradually rises. When the water level in the tank 10 reaches a set threshold, the ultrasonic anti-sludge system is activated. The ultrasonic controller 41 activates the ultrasonic transducer 40 according to a preset program. The high-frequency (>20kHz) vibration generated by the ultrasonic transducer 40 propagates in the water, triggering a strong cavitation effect (generating and collapsing a large number of microbubbles) and a mechanical vibration effect. These two effects work together to create intense turbulence and shear force at the bottom of the tank and in the water, continuously disturbing the water and preventing suspended solids (SS) in the sewage from settling, keeping them in a suspended state. When there is no water in the tank or the water level is extremely low, the ultrasonic anti-sludge system is turned off.

[0046] Furthermore, after the ultrasonic anti-sludge system is activated and before it is deactivated, the ultrasonic transducer is controlled to operate intermittently by the ultrasonic controller. The starting position, vibration frequency, operating power, and intermittent operation interval of the ultrasonic transducer are dynamically adjusted according to the water level in the tank. The ultrasonic transducer 40 operates for a certain period and then stops for a period, repeating this cycle. This intermittent operation mode effectively inhibits sludge buildup at the bottom of the tank while reducing energy consumption and extending the equipment's lifespan. When the water level in the pollution storage tank increases, the vibration frequency and operating power of the ultrasonic transducer 40 can be appropriately increased, and the intermittent operation interval can be decreased; when the water level in the pollution storage tank decreases, the vibration frequency and operating power of the ultrasonic transducer 40 can be appropriately decreased, and the intermittent operation interval can be increased.

[0047] Specifically, when the bottom of the pool is provided with a drainage slope 11 and the top surface of the ultrasonic transducer plate 40 is flush with the drainage slope 11, multiple rows of ultrasonic transducers plate 40 are arranged at intervals along the inclined direction of the drainage slope 11. A liquid level gauge 50 is installed at the highest point of each row of ultrasonic transducers plate 40, and multiple liquid level gauges 50 are arranged at intervals along the vertical direction above the drainage slope 11. During the water intake and silt prevention phases: When the water level in the pool 10 reaches the lowest level gauge 50, the level gauge 50 transmits a signal to the ultrasonic controller 41. The ultrasonic controller 41 then activates a row of ultrasonic transducers 40 at the location of the level gauge 50 and operates intermittently. As the water level rises, more level gauges 50 are triggered, controlling more ultrasonic transducers 40 to start operating. Once all ultrasonic transducers 40 are activated, the level gauges 50 above the drainage slope 11 will provide real-time feedback on the water level in the pool 10. The ultrasonic controller 41 can dynamically adjust the vibration frequency, operating power, and intermittent operation time interval of the ultrasonic transducers 40 based on the water level in the pool 10. Similarly, during the drainage phase: After rainfall, the submersible pump 30 is activated to drain the water from the pool. Wastewater (including suspended particulate matter) inside tank 10 is pumped to a wastewater treatment plant through outlet pipe 31. During drainage, the water level inside tank 10 is monitored in real time by level gauge 50 and fed back to ultrasonic controller 41. Ultrasonic controller 41 dynamically adjusts the vibration frequency, operating power, and intermittent operation time interval of ultrasonic transducer 40 according to the water level inside tank 10. When the water level inside tank 10 drops below the top row of ultrasonic transducer 40 on drainage slope 11, ultrasonic controller 41 controls the top row of ultrasonic transducer 40 to stop vibrating. As the water level drops, the ultrasonic transducer 40 on drainage slope 11 gradually stop working from top to bottom. Submersible pump 30 continues to work until the wastewater in the tank is basically emptied. In this embodiment, ultrasonic transducer 40 adopts a graded control and intermittent operation mode during the water inlet and anti-siltation stages and the drainage stage, which can achieve precise and efficient operation with low energy consumption. When there is no water in the tank or the water level is extremely low, the ultrasonic anti-siltation system is in a closed state.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined sewer overflow pollution regulating tank for preventing siltation, comprising a tank body, wherein the tank body is provided with an inlet pipe for receiving combined sewer overflow sewage and drainage facilities for discharging sewage from the tank body; characterized in that: It also includes an ultrasonic anti-sludge system, which includes multiple ultrasonic transducers. The bottom of the pool body is provided with mounting holes corresponding to the ultrasonic transducers. Each ultrasonic transducer is embedded in the corresponding mounting hole, and the side wall of the ultrasonic transducer and the inner wall of the mounting hole are filled with flexible sealant.

2. The anti-siltation combined sewer overflow pollution regulating tank as described in claim 1, characterized in that: The effective ranges of adjacent ultrasonic transducers are connected or partially overlap, and the effective range of the ultrasonic anti-sludge system covers the bottom of the pool.

3. The anti-siltation combined sewer overflow pollution regulating tank as described in claim 1, characterized in that: The top surface of the ultrasonic transducer plate is an ultrasonic radiation surface and is flush with the top surface of the pool bottom.

4. The anti-siltation combined sewer overflow pollution regulating tank as described in claim 1, characterized in that: A steel plate is pre-embedded outside the pool body, the bottom of the ultrasonic transducer is fixed on the steel plate, and a rubber shock-absorbing pad is provided between the ultrasonic transducer and the steel plate.

5. The anti-siltation combined sewer overflow pollution regulating tank as described in claim 1, characterized in that: The bottom of the pool is partially concave to form a water storage tank, and the drainage facility is installed in the water storage tank; except for the area where the water storage tank is located, the top surface of the pool bottom is provided with a drainage slope that slopes downward toward the water storage tank.

6. The anti-siltation combined sewer overflow pollution regulating tank as described in claim 1, characterized in that: The ultrasonic anti-sludge system also includes an ultrasonic controller, which is located at the top of the pool body, and each of the ultrasonic transducers is electrically connected to the ultrasonic controller.

7. The anti-siltation combined sewer overflow pollution regulating tank as described in claim 6, characterized in that: Multiple level gauges are arranged at intervals along the vertical direction inside the pool, and each level gauge is electrically connected to the ultrasonic controller.

8. A combined sewage treatment system, comprising a sewage treatment plant, characterized in that: It also includes a combined sewer overflow pollution storage tank for preventing siltation as described in any one of claims 1-7, wherein the inlet pipe is connected to the overflow outlet of the combined sewer overflow well, and the drainage facility is connected to the sewage treatment plant.

9. A method for treating combined sewage, characterized in that: The combined sewage treatment system according to claim 8, the method includes the following steps: Combined sewage overflowing from the combined sewage overflow well is introduced into the tank through the inlet pipe. When the water level in the tank reaches the set threshold, the ultrasonic anti-sludge system is activated. The high-frequency vibration generated by the ultrasonic transducer propagates in the water, causing a strong cavitation effect and mechanical vibration effect, so that the solid suspended particles in the sewage are always in a suspended state. After the rainfall ends, the sewage in the pool is pumped to the sewage treatment plant through the drainage facilities; after the sewage in the pool is basically emptied, the ultrasonic anti-sludge system is turned off.

10. The combined sewage treatment method as described in claim 9, characterized in that: After the ultrasonic anti-sludge system is started and before it is shut down, the ultrasonic transducer is controlled to run intermittently by the ultrasonic controller. The starting position, vibration frequency, operating power and intermittent operation time interval of the ultrasonic transducer are dynamically adjusted according to the water level in the pool.

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