Flushing system for rectangular secondary sedimentation tank

Abstract

The utility model provides a flushing system for a rectangular secondary sedimentation tank, which is characterized in that a supernatant which is relatively clear after being naturally settled in the secondary sedimentation tank is pumped through a supernatant suction pipeline arranged in the adjacent rectangular secondary sedimentation tank, and the pumped supernatant is pressurized by a movable water pump; and the sludge is conveyed to the secondary sedimentation tank to be washed through the spray-washing header pipe and the spray-washing branch pipes, so that high-efficiency washing of the deposited sludge at the bottom and on the side wall of the tank is realized. Compared with a traditional flushing mode, precious water resources are saved, and cost expenditure caused by using extra water sources is also avoided. Meanwhile, as the supernate is subjected to purification treatment to a certain degree, the supernate does not cause negative influence on the water quality in the secondary sedimentation tank when being used as a flushing medium, and on the contrary, the effluent quality can be further improved. Meanwhile, due to the design of the water spraying assembly, the water spraying position can be flexibly adjusted within a certain range, it is guaranteed that the secondary sedimentation tank can be fully cleaned, the cleaning efficiency is improved, and the thoroughness and uniformity of cleaning are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a flushing system for a rectangular secondary sedimentation tank. Background Technique

[0002] In the water treatment process, the rectangular secondary sedimentation tank, as an important part of the activated sludge process, undertakes the key tasks of removing suspended solids and separating mud and water. With the rapid development of industrialization and urbanization, the scale and quantity of sewage treatment plants are increasing continuously, putting forward higher requirements for the operation efficiency and maintenance management of secondary sedimentation tanks. However, during the long-term operation of traditional secondary sedimentation tanks, sludge and impurities are likely to accumulate at the bottom of the tank, which not only affects the effluent quality, but also may reduce the treatment capacity of the secondary sedimentation tank, and even lead to blockage and failure.

[0003] Traditional methods for solving the problem of sludge accumulation in secondary sedimentation tanks mainly include mechanical sludge scraping, chemical cleaning, and regular emptying and cleaning, etc. Although mechanical sludge scraping can regularly remove some bottom sludge, it has limited effect on stubborn dirt attached to the pool wall and bottom; although chemical cleaning has obvious cleaning effect, it is costly and may cause secondary pollution to the environment; regular emptying and cleaning is time-consuming and laborious, affecting the continuous operation of sewage treatment plants. In view of this, it is particularly important to provide a high-efficiency, economical and environmentally friendly flushing system for secondary sedimentation tanks. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the utility model provides a flushing system for a rectangular secondary sedimentation tank, which solves the problems of low treatment efficiency, poor effect and high cost in the prior art after sludge accumulation in some secondary sedimentation tanks.

[0005] A flushing system for a rectangular secondary sedimentation tank includes N rectangular secondary sedimentation tanks, where N is a natural number greater than 2. It also includes a supernatant suction pipeline, a mobile water pump, a spray washing main pipe, a spray washing branch pipe, and a water spraying component with adjustable spraying position. The supernatant suction pipeline is arranged in the middle of the side wall of adjacent rectangular secondary sedimentation tanks. The water outlet end of the supernatant suction pipeline is connected to the mobile water pump. The water outlet end of the mobile water pump is connected to the spray washing main pipe. The water outlet end of the spray washing main pipe is connected to the spray washing branch pipe. The spray washing branch pipe is arranged in the middle of the side wall of the next rectangular secondary sedimentation tank, and is provided with a plurality of water spraying ports, on which the water spraying component is arranged.

[0006] Preferably, the water spraying component includes a high-pressure hose, a high-pressure nozzle, a connecting rod, and a waterproof electric telescopic rod. The water inlet end of the high-pressure hose is connected to the water spraying port. The water outlet end of the high-pressure hose is connected to the high-pressure nozzle. The high-pressure nozzle is detachably installed on the connecting rod. One end of the waterproof electric telescopic rod is arranged on the side wall of the rectangular secondary sedimentation tank, and the other end of the waterproof electric telescopic rod is hinged to the connecting rod.

[0007] Further, the high-pressure nozzle is a hemispherical high-pressure nozzle.

[0008] Preferably, the waterproof electric telescopic rod is perpendicular to the side wall of the rectangular secondary sedimentation tank or is arranged at an acute angle downward with the side wall of the rectangular secondary sedimentation tank.

[0009] Preferably, the supernatant suction pipeline, the spray cleaning main pipe and the spray cleaning branch pipes are all made of stainless steel.

[0010] Preferably, 90-degree elbows are arranged at the water outlet ends of the supernatant suction pipeline and the spray cleaning main pipe.

[0011] Preferably, a first electric valve is arranged at the water inlet end of the spray cleaning main pipe. An air inlet is provided on one side of the water inlet end of the spray cleaning main pipe. A second electric valve is arranged at the air inlet and is connected to a high-pressure air source.

[0012] Preferably, a filter screen and a third electric valve are arranged at the water inlet end of the supernatant suction pipeline.

[0013] Preferably, ultrasonic sensors are arranged at the bottoms of the spray cleaning branch pipes.

[0014] Preferably, the spray cleaning branch pipes are arranged at 1 / 3 to 1 / 2 of the height of the rectangular secondary sedimentation tank.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model provides a flushing system for a rectangular secondary sedimentation tank. Through the supernatant suction pipeline arranged in the middle of the side of the adjacent rectangular secondary sedimentation tank wall, the relatively clear supernatant after natural sedimentation in the secondary sedimentation tank during operation is effectively extracted. This part of the supernatant might have been directly discharged or subjected to subsequent treatment in the conventional treatment process, while this system reuses it in the flushing operation. After pressurizing the extracted supernatant with a mobile water pump, it is transported to the secondary sedimentation tank to be flushed through the spray main pipe and spray branch pipes, achieving efficient flushing of the sludge accumulated at the bottom and on the side walls of the tank. Compared with traditional flushing methods, such as using clean water or chemical agents, this system not only saves precious water resources but also avoids the cost expenditure caused by using additional water sources. At the same time, since the supernatant itself has undergone a certain degree of purification treatment, using it as a flushing medium will not have a negative impact on the water quality in the secondary sedimentation tank, but instead helps to further improve the effluent quality. Meanwhile, the design of the spraying component enables the spraying position to be flexibly adjusted within a certain range, ensuring that the secondary sedimentation tank can be fully cleaned, not only improving the cleaning efficiency but also guaranteeing the thoroughness and uniformity of the cleaning, which helps to improve the effluent quality and extend the service life of the secondary sedimentation tank. Therefore, through the recycling of the supernatant as a flushing medium and the flexible and efficient design of the spraying component, the flushing system for the rectangular secondary sedimentation tank realizes the efficient utilization of water resources and the significant improvement of the cleaning effect, not only reducing the operation cost of the sewage treatment plant but also improving the effluent quality, with remarkable economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the flushing system for the rectangular secondary sedimentation tank described in the utility model;

[0018] Figure 2 is a schematic structural diagram of one side of the spray branch pipe described in the utility model;

[0019] Figure 3 is a schematic side structural diagram of one side of the spray branch pipe described in the utility model;

[0020] Wherein:

[0021] 10 - rectangular secondary sedimentation tank, 20 - supernatant suction pipeline, 30 - mobile water pump, 40 - spray main pipe, 50 - spray branch pipe, 60 - spraying component, 70 - elbow, 61 - high-pressure hose, 62 - high-pressure nozzle, 63 - connecting rod, 64 - waterproof electric telescopic rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following described embodiments are only a part of the embodiments of the utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the utility model without creative efforts shall fall within the protection scope of the utility model.

[0023] Refer to Figures 1 to 3 In this embodiment, a flushing system for a rectangular secondary sedimentation tank is provided, which includes N rectangular secondary sedimentation tanks 10, where N is a natural number greater than 2. It also includes a supernatant suction pipeline 20, a mobile water pump 30, a spray main pipe 40, a spray branch pipe 50, and a water spraying assembly 60 with adjustable spraying positions. The supernatant suction pipeline 20 is arranged in the middle of the side wall of adjacent rectangular secondary sedimentation tanks 10. The water outlet end of the supernatant suction pipeline 20 is connected to the mobile water pump 30. The water outlet end of the mobile water pump 30 is connected to the spray main pipe 40. The water outlet end of the spray main pipe 40 is connected to the spray branch pipe 50. The spray branch pipe 50 is arranged in the middle of the side wall of the next rectangular secondary sedimentation tank 10, and is provided with a plurality of water spraying ports 80, on which the water spraying assembly 60 is arranged.

[0024] Refer to Figure 3 Preferably, the water spraying assembly 60 includes a high-pressure hose 61, a high-pressure nozzle 62, a connecting rod 63, and more than 2 waterproof electric telescopic rods 64. The water inlet end of the high-pressure hose 61 is connected to the water spraying port, and the water outlet end of the high-pressure hose 61 is connected to the high-pressure nozzle 62. The high-pressure nozzle 62 is detachably installed on the connecting rod 63. One end of the waterproof electric telescopic rod 64 is arranged on the side wall of the rectangular secondary sedimentation tank 10, and the other end of the waterproof electric telescopic rod 64 is hinged to the connecting rod 63. When the position of the spray cleaning needs to be adjusted, the electric telescopic rod 64 extends or shortens, thereby driving the connecting rod 63 to move. The connecting rod 63 drives the high-pressure nozzle 62 to move, so that the water spraying position can be adjusted. It should be noted that the length of the high-pressure hose 61 is greater than or equal to the maximum extended length of the waterproof electric telescopic rod 64. The design of the waterproof electric telescopic rod 64 and the connecting rod 63 enables the water spraying assembly 60 to freely adjust the water spraying and position, ensuring that all positions of the secondary sedimentation tank 10 can be cleaned as much as possible, thus significantly improving the flushing effect, realizing the effective utilization and conservation of water resources, reducing the operation cost at the same time, and reflecting the design concept of economy and environmental protection.

[0025] Refer to Figure 3 Further, the high-pressure nozzle 62 is a hemispherical high-pressure nozzle 62. The hemispherical design enables the high-pressure nozzle 62 to form a relatively concentrated water flow beam when spraying water, while maintaining a certain spraying range. It not only ensures the impact force of the water flow on the accumulated mud and dirt in the secondary sedimentation tank 10, but also can cover a wider area, thereby improving the flushing efficiency. Preferably, in this embodiment, the waterproof electric telescopic rod 64 is perpendicular to the side wall of the rectangular secondary sedimentation tank 10 or is arranged at an acute angle downward with the side wall of the rectangular secondary sedimentation tank 10.

[0026] Preferably, the supernatant suction pipe 20, the main spray pipe 40, and the spray branch pipe 50 are all made of stainless steel. Stainless steel has excellent corrosion resistance and can withstand the erosion of corrosion factors such as acid-base substances, microorganisms, and their metabolites in sewage, thereby extending the service life of the pipeline and reducing leakage and replacement frequency caused by corrosion.

[0027] Refer to Figure 1 , preferably, 90-degree elbows 70 are provided at the water outlet ends of the supernatant suction pipe 20 and the main spray pipe 40, making the installation more convenient.

[0028] Preferably, a first electric valve is provided at the water inlet end of the main spray pipe 40. An air inlet is provided on one side of the water inlet end of the main spray pipe 40. A second electric valve is provided at the air inlet and is connected to a high-pressure air source. The high-pressure air source can not only pressurize and spray through the main spray pipe 40 and its branch pipes when needed, significantly increasing the water spraying pressure and thus enhancing the cleaning effect; moreover, during regular maintenance, by closing the first electric valve and opening the second electric valve, high-pressure gas can smoothly enter the spray system to thoroughly clean the main spray pipe 40 and the spray branch pipe 50, wash out the internal blockages, effectively prevent pipeline blockage, and ensure the long-term stable operation of the system.

[0029] Preferably, a filter screen and a third electric valve are provided at the water inlet end of the supernatant suction pipe 20. The presence of the filter screen effectively blocks large particle impurities, suspended solids, etc. in the supernatant from entering the suction pipe, thereby ensuring that the water quality entering the subsequent treatment link is purer, reducing the burden on the subsequent treatment equipment, and extending the service life of the equipment. The third electric valve is closed when the system is not in use to prevent sludge from seeping into the supernatant suction pipe 20 and causing blockage.

[0030] Preferably, an ultrasonic sensor is provided at the bottom of the spray branch pipe 50. The ultrasonic sensor uses the principle of sound wave reflection to accurately measure the distance between the sludge surface and the sensor probe, thereby accurately judging the accumulation depth of the sludge. The ultrasonic sensor is connected to a PLC processor, which can instantaneously obtain information on the sludge accumulation situation and provide strong support for subsequent cleaning operations. Once the sludge accumulation exceeds a preset threshold, the PLC processor can trigger an alarm to remind the operator to turn on the flushing system for this rectangular secondary sedimentation tank to ensure that the secondary sedimentation tank 10 always maintains the best operating state.

[0031] Preferably, the spray washing branch pipe 50 is arranged at the height of 1 / 3 - 1 / 2 of the rectangular secondary sedimentation tank 10. By arranging the spray washing branch pipe 50 within this height range, it not only ensures that the water flow can fully cover and impact most of the sludge and impurities in the tank, improving the cleaning efficiency; at the same time, it also avoids the problem of easy blockage caused by the too low position of the spray washing branch pipe 50 and the possible cleaning blind area caused by the too high position. Therefore, it optimizes the cleaning effect, reduces the maintenance difficulty, and makes the flushing operation of the rectangular secondary sedimentation tank 10 more efficient and reliable.

[0032] During use, start the mobile water pump 30, and draw the relatively clear supernatant after natural sedimentation from the middle part of the side of the adjacent rectangular secondary sedimentation tank 10 through the supernatant suction pipeline 20. After the supernatant is pressurized in the mobile water pump 30, it reaches the spray washing main pipe 40 and then the spray washing branch pipe 50, and is evenly sprayed onto the bottom and side walls of the secondary sedimentation tank 10 to be washed, so that the secondary sedimentation tank 10 is cleaned. When it is necessary to adjust the cleaning position, it can be achieved by adjusting the water spraying assembly 60.

[0033] The utility model provides a flushing system for a rectangular secondary sedimentation tank. Through the supernatant suction pipeline 20 arranged at the middle part of the side wall of the adjacent rectangular secondary sedimentation tank 10, it effectively draws the relatively clear supernatant in the operating secondary sedimentation tank 10 after natural sedimentation. This part of the supernatant might have been directly discharged or subjected to subsequent treatment in the conventional treatment process, while this system reuses it in the flushing operation. After pressurizing the drawn supernatant by the mobile water pump 30, it is transported to the secondary sedimentation tank 10 to be washed through the spray washing main pipe 40 and the spray washing branch pipe 50, realizing the efficient flushing of the accumulated sludge at the bottom and side walls of the tank. Compared with traditional flushing methods, such as using clean water or chemical agents, this system not only saves precious water resources but also avoids the cost expenditure caused by using additional water sources. At the same time, since the supernatant itself has been purified to a certain extent, when used as a flushing medium, it will not have a negative impact on the water quality in the secondary sedimentation tank 10, but instead helps to further improve the effluent quality. At the same time, the design of the water spraying assembly 60 enables the spraying position to be flexibly adjusted within a certain range, ensuring that the secondary sedimentation tank 10 can be fully cleaned, not only improving the cleaning efficiency but also ensuring the thoroughness and uniformity of the cleaning, which helps to improve the effluent quality and extend the service life of the secondary sedimentation tank 10. Therefore, through the recycling of the supernatant as a flushing medium and the flexible and efficient design of the water spraying assembly 60, the flushing system for the rectangular secondary sedimentation tank realizes the efficient utilization of water resources and the significant improvement of the cleaning effect, not only reducing the operating cost of the sewage treatment plant but also improving the effluent quality, with remarkable economic and environmental benefits.

[0034] The above-disclosed are only several preferred embodiments of the utility model. Of course, the scope of rights of the utility model cannot be limited by this. Therefore, equivalent changes made according to the scope of the patent application of the utility model still fall within the scope covered by the utility model.

Claims

1. A flushing system for a rectangular secondary sedimentation tank, comprising N rectangular secondary sedimentation tanks, where N is a natural number greater than 2, characterized in that: It also includes a supernatant suction pipe, a mobile water pump, a spray main pipe, a spray branch pipe and a water spray assembly with adjustable spray position. The supernatant suction pipe is arranged in the middle of the side wall of the adjacent rectangular secondary sedimentation tank, the water outlet end of the supernatant suction pipe is connected to the mobile water pump, the water outlet end of the mobile water pump is connected to the spray main pipe, the water outlet end of the spray main pipe is connected to the spray branch pipe, the spray branch pipe is arranged in the middle of the side wall of the next rectangular secondary sedimentation tank, a plurality of water spray outlets are arranged thereon, and the water spray assembly is arranged on the water spray outlet.

2. The flushing system for a rectangular secondary sedimentation tank according to claim 1, characterized in that: The water spray assembly includes a high-pressure hose, a high-pressure nozzle, a connecting rod and a waterproof electric telescopic rod. The water inlet end of the high-pressure hose is connected to the water spray port, and the water outlet end of the high-pressure hose is connected to the high-pressure nozzle. The high-pressure nozzle is detachably installed on the connecting rod. One end of the waterproof electric telescopic rod is arranged on the side wall of the rectangular secondary sedimentation tank, and the other end of the waterproof electric telescopic rod is hingedly arranged on the connecting rod.

3. The flushing system for a rectangular secondary sedimentation tank according to claim 2, characterized in that: The high-pressure nozzle is a hemispherical high-pressure nozzle.

4. The flushing system for a rectangular secondary sedimentation tank according to claim 2, characterized in that: The waterproof electric telescopic rod is perpendicular to the side wall of the rectangular secondary sedimentation tank or is arranged downward to form an acute angle with the side wall of the rectangular secondary sedimentation tank.

5. The flushing system for a rectangular secondary sedimentation tank according to claim 1, characterized in that: The supernatant suction pipeline, the spray main pipe and the spray branch pipe are all made of stainless steel.

6. The flushing system for a rectangular secondary sedimentation tank according to claim 1, characterized in that: The water outlet end of the supernatant suction pipe and the water outlet end of the spray washing main pipe are both provided with 90-degree elbows.

7. The flushing system for a rectangular secondary sedimentation tank according to claim 1, characterized in that: A first electric valve is arranged at the water inlet end of the spray main pipe, an air inlet is provided on the side of one side of the water inlet end of the spray main pipe, a second electric valve is arranged at the air inlet and is connected to a high-pressure air source.

8. The flushing system for a rectangular secondary sedimentation tank according to claim 1, characterized in that: A filter screen and a third electric valve are arranged at the water inlet end of the supernatant suction pipeline.

9. The flushing system for a rectangular secondary sedimentation tank according to claim 1, characterized in that: An ultrasonic sensor is arranged at the bottom of the spray branch pipe.

10. The flushing system for a rectangular secondary sedimentation tank according to claim 1, characterized in that: The spray branch pipe is arranged at 1 / 3 to 1 / 2 of the height of the rectangular secondary sedimentation tank.

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