Sewage treatment system and method thereof

Abstract

The invention relates to a sewage treatment system and method, and relates to the technical field of pollutant purification and separation. The multiple sewage treatment tanks are arranged at intervals in the height direction of the rack, and the multiple sewage treatment tanks are sequentially arranged to be a sedimentation tank, an aeration tank, a biological filter tank, a chemical sedimentation tank, a sludge concentration tank, a disinfection tank and a sewage recycling tank; a water inlet pipeline is arranged on the sewage treatment tank at the top; the automatic water replenishing mechanism is arranged between two adjacent sewage treatment tanks and is used for communicating the adjacent sewage treatment tanks and enabling the liquid level in each sewage treatment tank to be at a preset position; the cleaning mechanism is arranged between the rack and the plurality of sewage treatment pools and is used for regularly cleaning impurities deposited at the bottoms of the plurality of sewage treatment pools. The sewage treatment system has the advantages that the occupied space of the sewage treatment system in the horizontal direction is reduced, the space utilization rate is increased, and meanwhile workers can conveniently clean sludge at the bottoms of the treatment ponds in time.

Description

Technical Field

[0001] This application relates to the technical field of pollutant purification and separation, and in particular to a sewage treatment system and method thereof. Background Art

[0002] A sewage treatment system is a facility for treating and purifying sewage, aiming to remove pollutants in the sewage to meet the discharge standards or water quality requirements for reuse. The sewage treatment system mainly includes the following main treatment stages: primary treatment to remove suspended solids and floating substances in the sewage by physical methods; secondary treatment using biological treatment technologies such as the activated sludge method and the biofilm method to decompose organic substances in the sewage by microorganisms; tertiary treatment to remove residual pollutants such as nutrients (nitrogen, phosphorus), pathogens, etc. after secondary treatment; and final disposal of the sludge generated during the treatment process by concentrating, dewatering, and stabilizing it to reduce the volume and prevent environmental pollution. The treated sewage can meet certain water quality standards and be used for agricultural irrigation, industrial cooling, landscape water, etc., to achieve the recycling of water resources.

[0003] Currently, the sewage treatment system includes a sedimentation tank that allows suspended solids in the sewage to settle to the bottom by gravity, an aeration tank that blows air or oxygen to promote the growth of microorganisms and the decomposition of organic substances, a biological filter filled with biofilm filter media to decompose organic substances in the sewage, a disinfection tank that uses chemical agents (such as chlorine, ozone) or physical methods (such as ultraviolet light) to disinfect the treated sewage to kill pathogens, a sludge thickening tank used to concentrate the sludge generated during the treatment process to reduce the volume, a sludge dewatering machine installed in the sludge thickening tank to further remove the water in the sludge by mechanical force to form a sludge cake, a chemical sedimentation tank that adds chemical agents to form precipitates of dissolved pollutants in the sewage, a sewage reuse tank that uses membrane treatment technologies such as reverse osmosis, ultrafiltration, and nanofiltration for deep purification of sewage, and many other sewage treatment tanks; however, each sewage treatment tank usually has a large floor area and is laid flat on the ground, occupying a large amount of space, not only resulting in low space utilization rate, but also making it difficult to clean the sludge deposited at the bottom of each treatment tank. Summary of the Invention

[0004] In order to reduce the occupied space of the sewage treatment system in the horizontal direction, improve the space utilization rate, and at the same time facilitate the staff to clean the sludge at the bottom of each treatment tank in a timely manner, this application provides a sewage treatment system and method thereof.

[0005] A sewage treatment system and method provided by this application adopt the following technical solutions: In the first aspect, this application provides a sewage treatment system, including: A frame; Sewage treatment tanks, with multiple numbers arranged at intervals along the height direction of the frame, and the multiple sewage treatment tanks are successively set as sedimentation tanks, aeration tanks, biological filter tanks, chemical sedimentation tanks, sludge thickening tanks, disinfection tanks, and sewage reuse tanks; an inlet pipe is arranged on the sewage treatment tank at the top; An automatic water replenishment mechanism, arranged between two adjacent sewage treatment tanks, is used to connect adjacent sewage treatment tanks and make the liquid levels in each sewage treatment tank at a preset position; A cleaning mechanism, arranged between the frame and the multiple sewage treatment tanks, is used to regularly clean the impurities deposited at the bottom of the multiple sewage treatment tanks.

[0006] By adopting the above technical solutions, when treating sewage, first, the sewage enters the sedimentation tank through the inlet pipe, and suspended solids precipitate to the bottom under the action of gravity to form primary sediment sludge. Then, the sewage enters the aeration tank or biological filter tank for secondary treatment. The aeration tank promotes the growth of microorganisms and the decomposition of organic matter by injecting air or oxygen, and the biological filter tank uses the biofilm method to remove organic matter in the sewage through the biodegradation of microorganisms. The sewage after secondary treatment further enters the chemical sedimentation tank to remove residual nutrients (such as nitrogen, phosphorus), etc. The sludge generated during the treatment process enters the sludge thickening tank for thickening, and then is further dehydrated by a sludge dehydrator in the sludge thickening tank to form a sludge cake. Then, chemical agents (such as chlorine, ozone) or physical methods (such as ultraviolet light) are used to disinfect the sewage entering the disinfection tank to kill pathogens, ensuring that the water quality meets the discharge or reuse standards. Finally, the disinfected sewage enters the sewage reuse tank, and the sewage is deeply treated through membrane treatment technologies such as reverse osmosis and ultrafiltration to reach a higher water quality standard, which can be used for subsequent agricultural irrigation, industrial cooling, landscape water, etc., thus realizing the recycling of water resources; among them, each sewage treatment tank is arranged along the height direction of the frame, which not only reduces the occupied space of the sewage treatment system in the horizontal direction and improves the space utilization rate, but also the sewage can flow naturally between each sewage treatment tank under the action of gravity. At the same time, the automatic water replenishment mechanism can realize the automatic replenishment of sewage in each sewage treatment tank, ensure that the liquid level in each tank is at a preset position, and maintain the stable operation of the system. And the staff can regularly transport the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter tank, and chemical sedimentation tank to the sludge thickening tank through the cleaning mechanism, and transport the compressed or dehydrated sludge in the sludge thickening tank to the outside for other uses (such as raw materials for cement, etc.), thereby increasing the effective volume of each sewage treatment tank and improving the purification efficiency of the sewage treatment system.

[0007] Optionally, the cleaning mechanism includes: A lifting support frame, arranged between the frame and the sewage treatment tank; A flipping support frame, rotatably connected to the lifting support frame; A collection box, arranged on one side of the flipping support frame; The lifting component is arranged between the lifting support frame and the machine frame and is used to realize the lifting of the lifting support frame; The moving component is arranged between the collection box and the flipping support frame and is used to drive the collection box to move inside or outside the sewage treatment tank; The cleaning component is arranged between the sewage treatment tank and the collection box and is used to move the impurities deposited at the bottom of the sewage treatment tank into the collection box; The flipping component is arranged between the lifting support frames and is used to clean the impurities temporarily stored in the collection box.

[0008] By adopting the above technical solutions, when regularly discharging the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter tank, and chemical sedimentation tank into the sewage treatment tank or transporting them to the sludge thickening tank to increase the effective volume of each sewage treatment tank, first, the lifting component drives the lifting support frame to move to one side of the sewage treatment tank to be cleaned. Then, the moving component moves the collection box into the sewage treatment tank. Subsequently, the cleaning component moves the deposited impurities at the bottom of the sewage treatment tank into the collection box. After the impurities are collected, the moving component drives the collection box out of the sewage treatment tank. The impurities in the collection box can be directly dumped to a designated location for recycling through the lifting component and the flipping component, or can be moved to the sludge thickening tank for compression and dehydration before recycling; among them, through the coordinated use of the lifting component, flipping component, and moving component, the automatic cleaning of impurities is realized, reducing the labor intensity and time cost of manual cleaning, and the coordinated use of the collection box, cleaning component, and moving component can realize the automatic collection of deposited impurities, improving the cleaning efficiency.

[0009] Optionally, the lifting component includes: The lifting frame is fixedly arranged on the machine frame, and the lifting support frame is slidably connected to the lifting frame; The lifting screw is rotatably connected to the lifting frame and is threadedly connected to the lifting support frame; The driving motor is connected to the lifting screw.

[0010] By adopting the above technical solutions, when the lifting component drives the lifting support frame to move up and down, first start the driving motor, and then the driving motor drives the lifting screw to rotate, and the lifting screw can drive the lifting support frame to move up and down along the guiding structure of the lifting frame; and the lifting component can also drive the lifting support frame and the collection box to enter or exit the sewage treatment tank to realize the cleaning process.

[0011] Optionally, the moving component includes: The moving frame is fixedly arranged on the collection box and is slidably connected to the flipping support frame; The thrust device is arranged between the flipping support frame and the moving frame and is used to drive the moving frame to move towards the side close to or away from the sewage treatment tank.

[0012] By adopting the above technical solution, when the collection box is moved into the sewage treatment tank by the moving component, first start the thrust device. The thrust device drives the moving frame and the collection box to move horizontally along the guiding structure of the flipping support frame, so that the collection box enters the gap between the two sewage treatment tanks. Then, drive the lifting support frame and the collection box to move downward through the lifting component, so that the collection box enters the interior of the sewage treatment tank. Subsequently, cooperate with the cleaning component to carry out the cleaning; after the impurities deposited at the bottom of the sewage treatment tank are cleaned up, reverse the operation of the lifting component and the thrust device to drive the moving frame and the collection box to move towards the side away from the sewage treatment tank, so that the collection box can be moved out of the sewage treatment tank.

[0013] Optionally, the cleaning component includes: A driving screw, rotatably connected to the sewage treatment tank, and a power motor is arranged at one end of the driving screw; A bucket, threadedly connected to the driving screw; A guiding rod, fixedly arranged inside the sewage treatment tank and slidably connected to the bucket; An opening and closing component, arranged on one side of the collection box, and an opening is arranged on one side of the collection box. The opening and closing component is used to open or close the opening.

[0014] By adopting the above technical solution, when cleaning the impurities deposited or adhered to the bottom of the sewage treatment tank through the cleaning component, first start the power motor, and then the power motor drives the driving screw to rotate. The bucket moves along the guiding rod under the guiding action of the guiding rod as the driving screw rotates, shovels up the deposited impurities at the bottom of the sewage treatment tank and moves them to the opening of the collection box. When the impurities enter the collection box, the opening and closing component closes to prevent the impurities from scattering during the movement.

[0015] Optionally, the opening and closing component includes: An opening and closing door, slidably connected along the height direction to one side of the opening of the collection box; An electric telescopic rod, arranged between the opening and closing door and the collection box.

[0016] By adopting the above technical solution, when the bucket moves the impurities to the opening of the collection box, the electric telescopic rod starts, drives the opening and closing door to move along the height direction, opens the opening of the collection box, and allows the impurities to enter the collection box. After the cleaning is completed, the electric telescopic rod works in the reverse direction to drive the opening and closing door to close the opening of the collection box to prevent the impurities from scattering during the movement.

[0017] Optionally, the flipping component includes: A rotating shaft, fixedly arranged on the flipping support frame, and the rotating shaft is rotatably connected to the lifting support frame; A worm gear, fixedly sleeved outside the rotating shaft; A worm, rotatably connected to the lifting support frame and meshing with the worm gear; The flipping motor is arranged at one end of the worm.

[0018] By adopting the above technical solution, when cleaning the impurities temporarily stored in the collection box through the flipping assembly, first start the flipping motor, then the flipping motor drives the worm to rotate, the worm drives the worm gear and the rotating shaft to rotate, the rotation of the rotating shaft drives the flipping support frame to flip, and the flipping support frame drives the collection box to flip from the horizontal position to the opening direction, so as to facilitate the dumping or treatment of impurities; among them, the worm gear and the worm have self-locking property, which can make the lifting support frame and the flipping support frame remain relatively static for a long time without power input, thereby improving the stability of the collection box.

[0019] Optionally, a conveyor belt is further arranged on one side of the frame, and a collecting hopper is arranged on the conveyor belt.

[0020] By adopting the above technical solution, the conveyor belt can continuously and automatically convey the impurities dumped by the collection box, ensuring the continuity and high efficiency of impurity treatment, and the collecting hopper makes the impurities dumped by the collection box not easy to scatter, facilitating the impurities to enter the conveyor belt.

[0021] Optionally, the automatic water replenishing mechanism includes: A connecting pipe, which is connected between two adjacent sewage treatment ponds; An electromagnetic valve, which is arranged on the connecting pipe and the water inlet pipe; A liquid level sensor, which is arranged in the sewage treatment pond and is used for detecting the liquid level height of the sewage in the sewage treatment pond and sending out a liquid level height detection signal; A controller, which is connected to the liquid level sensor and the electromagnetic valve, and is used for receiving the liquid level height detection signal to know the liquid level height of the sewage in the sewage treatment pond. When the liquid level height of the sewage in the sewage treatment pond is lower than the preset height, the controller sends a control signal to the electromagnetic valve to open the electromagnetic valve to replenish water to the sewage treatment pond.

[0022] By adopting the above technical solution, the liquid level sensor continuously detects the liquid level height of the sewage in the sewage treatment tank. When the water resources in the sewage reuse tank are transported to the outside for use, the liquid level height in the sewage reuse tank will be lower than the preset height. The liquid level sensor sends the detection signal to the controller. When the controller receives the liquid level height detection signal and determines that the sewage treatment tank needs to be replenished with water, the controller sends a control signal to the solenoid valve to open the solenoid valve. The sewage in the connecting pipe flows from the sewage treatment tank with a higher liquid level to the sewage treatment tank with a lower liquid level, realizing automatic water replenishment for each sewage treatment tank. When the liquid level reaches the preset height, the controller sends a control signal to the solenoid valve again to close the solenoid valve and stop water replenishment; through the cooperation of the liquid level sensor and the controller, automatic detection and water replenishment control of the liquid level of the sewage treatment tank are realized, thus avoiding problems such as over-water replenishment or insufficient water replenishment in the sewage treatment tank, resulting in poor treatment effects or equipment damage caused by too high or too low liquid levels in the tank, and improving the purification efficiency and stability of the sewage treatment system.

[0023] In a second aspect, the present application also provides a sewage treatment method, which is applicable to a sewage treatment system as described above, and its treatment steps are as follows: S1. Sewage enters the sedimentation tank through the inlet pipe, and suspended solids precipitate to the bottom by gravity to form primary sedimentation sludge. S2. Then the sewage enters the aeration tank or biological filter for secondary treatment. The aeration tank promotes the growth of microorganisms and the decomposition of organic matter by injecting air or oxygen, and the biological filter uses the biofilm method to remove organic matter in the sewage through the biodegradation of microorganisms. S3. The sewage after secondary treatment enters the chemical sedimentation tank to remove residual nutrients (such as nitrogen, phosphorus), etc. S31. On the one hand, the sludge generated during the treatment process enters the sludge thickening tank for thickening, and then is further dehydrated by the sludge dehydrator in the sludge thickening tank to form sludge cakes and transported to the outside for other uses. S31. On the other hand, the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter, and chemical sedimentation tank can be regularly transported to the sludge thickening tank by the cleaning mechanism and further dehydrated by the sludge dehydrator in the sludge thickening tank to form sludge cakes and transported to the outside for other uses; or the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter, and chemical sedimentation tank can be directly and regularly transported to the outside by the cleaning mechanism for other uses. S4. Chemical agents or physical methods are used to disinfect the sewage entering the disinfection tank to kill pathogens and ensure that the water quality meets the discharge or reuse standards. S5. The disinfected sewage enters the sewage reuse tank, and the sewage is deeply treated by membrane treatment technology to reach a higher water quality standard for subsequent agricultural irrigation, industrial cooling, landscape water use, etc. S6. The automatic water replenishment mechanism can automatically replenish sewage to each sewage treatment tank in real time to ensure that the liquid level in each tank is at a preset position.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: The sewage treatment tanks are arranged along the height direction of the frame, which not only reduces the occupied space of the sewage treatment system in the horizontal direction and improves the space utilization rate, but also enables the sewage to flow naturally between the sewage treatment tanks under the action of gravity. At the same time, the automatic water replenishment mechanism can realize the automatic replenishment of sewage in each sewage treatment tank to ensure that the liquid level in each tank is at a preset position, maintaining the stable operation of the system. And the staff can regularly transport the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter tank, and chemical sedimentation tank to the sludge thickening tank through the cleaning mechanism, and transport the compressed or dehydrated sludge in the sludge thickening tank to the outside for other uses (such as cement raw materials, etc.), thereby increasing the effective volume of each sewage treatment tank and improving the purification efficiency of the sewage treatment system; Through the coordinated use of the lifting component, flipping component, and moving component in the cleaning mechanism, the automatic cleaning of impurities is realized, reducing the labor intensity and time cost of manual cleaning. And the coordinated use of the collection box, cleaning component, and moving component can realize the automatic collection of deposited impurities, improving the cleaning efficiency; The flipping component has self-locking property, which can keep the lifting support frame and the flipping support frame relatively stationary for a long time without power input, thereby improving the stability of the collection box. And the conveyor belt can continuously and automatically transport the impurities dumped by the collection box to ensure the continuity and high efficiency of impurity treatment. And the aggregate hopper makes the impurities dumped by the collection box not easy to scatter, facilitating the impurities to enter the conveyor belt; The liquid level sensor continuously detects the liquid level height of the sewage in the sewage treatment tank. When the water resources in the sewage reuse tank are transported to the outside for use, the liquid level height in the sewage reuse tank will be lower than the preset height. The liquid level sensor sends the detection signal to the controller. When the controller receives the liquid level height detection signal and judges that the sewage treatment tank needs to be replenished with water, the controller sends a control signal to the solenoid valve to open the solenoid valve, and the sewage in the pipeline flows from the sewage treatment tank with a higher liquid level to the sewage treatment tank with a lower liquid level to realize the automatic water replenishment of each sewage treatment tank. When the liquid level reaches the preset height, the controller sends a control signal to the solenoid valve again to close the solenoid valve and stop the water replenishment; Through the cooperation of the liquid level sensor and the controller, the automatic detection and water replenishment control of the liquid level in the sewage treatment tank are realized, thereby avoiding the problems of over-water replenishment or insufficient water replenishment in the sewage treatment tank, resulting in poor treatment effects or equipment damage caused by too high or too low liquid levels in the tank, and improving the purification efficiency and stability of the sewage treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic structural diagram of the sewage treatment system in the present application; Figure 2 It is a partial structural schematic diagram of a sewage treatment system; Figure 3 It is a partial structural schematic diagram of a cleaning mechanism; Figure 4 It is a partial structural schematic diagram when the opening and closing door is in the open state; Figure 5 It is shown as Figure 4 A partial enlarged structural schematic diagram of part A in

[0026] Explanation of reference numerals: 1, frame; 2, sewage treatment tank; 3, inlet pipe; 4, automatic water replenishing mechanism; 41, connecting pipe; 42, solenoid valve; 5, cleaning mechanism; 51, lifting support frame; 52, flipping support frame; 521, T-shaped groove; 53, collection box; 54, lifting assembly; 541, lifting frame; 542, lifting screw; 543, driving motor; 55, moving assembly; 551, moving frame; 552, thrust device; 56, cleaning assembly; 561, driving screw; 562, power motor; 563, bucket; 564, guide rod; 565, opening and closing component; 5651, opening and closing door; 5652, electric telescopic rod; 57, flipping assembly; 571, rotating shaft; 572, worm gear; 573, worm; 574, flipping motor; 58, conveyor belt; 59, aggregate hopper; 6, lifting ladder. Detailed implementation manners

[0027] The following further elaborates on this application in conjunction with the attached Figures 1 - 5 for a more detailed description.

[0028] An embodiment of this application discloses a sewage treatment system. Referring to Figure 1 and Figure 2 , the sewage treatment system includes a frame 1, and a plurality of sewage treatment tanks 2 are fixedly provided at intervals along the height direction of the frame 1. The plurality of sewage treatment tanks 2 are sequentially arranged as sedimentation tanks, aeration tanks, biological filter tanks, chemical sedimentation tanks, sludge thickening tanks, disinfection tanks, and sewage reuse tanks. An inlet pipe 3 is further provided on the top sewage treatment tank 2, and a grille or sieve is provided in the inlet pipe 3 to intercept large particle impurities in the sewage, such as suspended solids, fibers, plastic fragments, etc., reduce the entry of such impurities into subsequent treatment units, reduce the load on subsequent treatment equipment, and at the same time make it difficult for subsequent treatment equipment to be blocked. An automatic water replenishing mechanism 4 is provided between two adjacent sewage treatment tanks 2. The automatic water replenishing mechanism 4 is used to connect adjacent sewage treatment tanks 2 and make the liquid levels in each sewage treatment tank 2 at a preset position. A cleaning mechanism 5 is provided between the frame 1 and the plurality of sewage treatment tanks 2. The cleaning mechanism 5 is used to regularly clean the impurities deposited at the bottom of the plurality of sewage treatment tanks 2. A lifting ladder 6 is further provided on the frame. The lifting ladder 6 is used to facilitate workers to reach various heights of the sewage treatment tank for operations such as feeding, equipment inspection, and maintenance.

[0029] When treating sewage, first, the sewage enters the sedimentation tank through the inlet pipe 3. Through the action of gravity, suspended solids settle to the bottom, forming primary sludge. Then, the sewage enters the aeration tank or biological filter for secondary treatment. The aeration tank promotes the growth of microorganisms and the decomposition of organic matter by injecting air or oxygen. The biological filter uses the biofilm method to remove organic matter in the sewage through the biodegradation of microorganisms. The sewage after secondary treatment further enters the chemical sedimentation tank to remove residual nutrients (such as nitrogen, phosphorus), etc. The sludge generated during the treatment process enters the sludge thickening tank for thickening, and then is further dewatered by the sludge dewatering machine in the sludge thickening tank to form a sludge cake. At the same time, the staff can also regularly transport the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter, and chemical sedimentation tank to the sludge thickening tank through the cleaning mechanism 5, and transport the compressed or dewatered sludge in the sludge thickening tank to the outside for other uses (such as raw materials for cement, etc.), thereby increasing the effective volume of each sewage treatment tank 2.

[0030] Then, chemical agents (such as chlorine, ozone) or physical methods (such as ultraviolet light) are used to disinfect the sewage entering the disinfection tank to kill pathogens and ensure that the water quality meets the discharge or reuse standards. Finally, the disinfected sewage enters the sewage reuse tank, and after deep treatment of the sewage through membrane treatment technologies such as reverse osmosis and ultrafiltration, a higher water quality standard can be achieved for subsequent agricultural irrigation, industrial cooling, landscape water use, etc., thereby realizing the recycling of water resources. Among them, the automatic water replenishment mechanism 4 can realize the automatic replenishment of sewage in each sewage treatment tank 2 to ensure that the liquid level in each tank is at a preset position and maintain the stable operation of the system.

[0031] In some embodiments, referring to Figure 1 and Figure 2 the automatic water replenishment mechanism 4 includes a communication pipe 41 connecting two adjacent sewage treatment tanks 2, and electromagnetic valves 42 are provided on both the communication pipe 41 and the inlet pipe 3. A liquid level sensor and a controller are arranged in the sewage treatment tank 2. The liquid level sensor is used to detect the liquid level height of the sewage in the sewage treatment tank 2 and send out a liquid level height detection signal. The liquid level sensor can be a float type, ultrasonic type, pressure type, etc. The controller is connected to the liquid level sensor and the electromagnetic valve 42, and is used to receive the liquid level height detection signal to know the liquid level height of the sewage in the sewage treatment tank 2. When the liquid level height of the sewage in the sewage treatment tank 2 is lower than the preset height, the controller sends a control signal to the electromagnetic valve 42 to open the electromagnetic valve 42 to replenish water to the sewage treatment tank 2.

[0032] The liquid level sensor continuously detects the liquid level height of the sewage in sewage treatment tank 2. When the water resources in the sewage reuse tank are transported for external use, the liquid level height in the sewage reuse tank will be lower than the preset height. The liquid level sensor sends a detection signal to the controller. When the controller receives the liquid level height detection signal and determines that sewage treatment tank 2 needs to be replenished with water, the controller sends a control signal to solenoid valve 42 to open solenoid valve 42. The sewage in pipeline 41 flows from sewage treatment tank 2 with a higher liquid level to sewage treatment tank 2 with a lower liquid level, realizing automatic water replenishment for each sewage treatment tank 2. When the liquid level reaches the preset height, the controller sends a control signal to solenoid valve 42 again to close solenoid valve 42 and stop water replenishment.

[0033] In some embodiments, referring to Figure 3 and Figure 4 , the cleaning mechanism 5 includes a lifting support frame 51 arranged between the frame 1 and the sewage treatment tank 2. A flipping support frame 52 is rotatably connected to the lifting support frame 51. A collection box 53 is arranged on one side of the flipping support frame 52. A lifting component 54 is arranged between the lifting support frame 51 and the frame 1, and the lifting component 54 is used to realize the lifting of the lifting support frame 51. A moving component 55 is arranged between the collection box 53 and the flipping support frame 52, and the moving component 55 is used to drive the collection box 53 to move inside or outside the sewage treatment tank 2. A cleaning component 56 is arranged between the sewage treatment tank 2 and the collection box 53, and the cleaning component 56 is used to move the impurities deposited at the bottom of the sewage treatment tank 2 into the collection box 53. A flipping component 57 is arranged between the lifting support frames 51, and the flipping component 57 is used to clean the impurities temporarily stored in the collection box 53. A conveyor belt 58 is also arranged on one side of the frame 1. The conveyor belt 58 can continuously and automatically convey the impurities dumped by the collection box 53. An aggregate hopper 59 is arranged on the conveyor belt 58, and the aggregate hopper 59 is used to prevent the impurities dumped from the collection box 53 from scattering and facilitate the impurities to enter the conveyor belt 58.

[0034] By regularly discharging the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter tank, and chemical sedimentation tank from the sewage treatment tank 2 or transporting them to the sludge thickening tank through the cleaning mechanism 5 to increase the effective volume of each sewage treatment tank 2, first, the lifting component 54 drives the lifting support frame 51 to move to one side of the sewage treatment tank 2 to be cleaned. Then, the collection box 53 is moved into the sewage treatment tank 2 through the moving component 55. Subsequently, the cleaning component 56 moves the deposited impurities at the bottom of the sewage treatment tank 2 into the collection box 53. After the impurities are collected, the moving component 55 drives the collection box 53 out of the sewage treatment tank 2. The impurities in the collection box 53 can be directly dumped to a designated location for recycling through the lifting component 54 and the flipping component 57, or can be moved to the sludge thickening tank for compression and dehydration before recycling.

[0035] In some embodiments, referring to Figure 3 and Figure 4 , the lifting assembly 54 includes a lifting frame 541 fixedly arranged on the frame 1. Exemplarily, a lifting rod is fixedly arranged on the lifting frame 541, and the lifting support frame 51 is slidably connected to the lifting rod. A lifting screw 542 is rotatably connected to the lifting frame 541, and the lifting frame 541 is threadedly connected to the lifting support frame 51. One end of the lifting screw 542 is connected to a driving motor 543.

[0036] When driving the lifting support frame 51 to move up and down through the lifting assembly 54, first start the driving motor 543, and then the driving motor 543 drives the lifting screw 542 to rotate. The lifting screw 542 can drive the lifting support frame 51 to move up and down along the guiding structure of the lifting frame 541; and the lifting assembly 54 can also drive the lifting support frame 51 and the collection tank 53 to enter or exit the sewage treatment tank 2 to realize the cleaning process.

[0037] In some embodiments, referring to Figure 3 and Figure 4 , the moving assembly 55 includes a moving frame 551 fixedly arranged on the collection tank 53. Exemplarily, the top of the moving frame 551 is arranged in a T shape. The turning support frame 52 is provided with a T-shaped groove 521 along its horizontal direction, and the moving frame 551 is slidably connected to the T-shaped groove 521. A thrust device 552 is arranged between the turning support frame 52 and the moving frame 551. The thrust device 552 is used to drive the moving frame 551 to move toward one side close to or away from the sewage treatment tank 2. Exemplarily, the thrust device 552 can be an electric push rod, a hydraulic cylinder or other suitable thrust sources.

[0038] When moving the collection tank 53 into the sewage treatment tank 2 through the moving assembly 55, first start the thrust device 552. The thrust device 552 drives the moving frame 551 and the collection tank 53 to move horizontally along the guiding structure of the turning support frame 52, so that the collection tank 53 enters the gap between the two sewage treatment tanks 2. Then, drive the lifting support frame 51 and the collection tank 53 to move downward through the lifting assembly 54, so that the collection tank 53 enters the interior of the sewage treatment tank 2. Subsequently, cooperate with the cleaning assembly 56 for cleaning; after the impurities deposited at the bottom of the sewage treatment tank 2 are cleaned up, reverse the operation of the lifting assembly 54 and the thrust device 552 to drive the moving frame 551 and the collection tank 53 to move toward the side away from the sewage treatment tank 2, so that the collection tank 53 is moved out of the sewage treatment tank 2.

[0039] In some embodiments, referring to Figure 3 and Figure 4, the cleaning component 56 includes a driving screw 561 rotatably connected inside the sewage treatment tank 2, and a power motor 562 is arranged at one end of the driving screw 561. A bucket 563 is threadedly connected to the driving screw 561, and a guide rod 564 is fixedly arranged inside the sewage treatment tank 2, and the guide rod 564 is slidably connected to the bucket 563. An opening is arranged on one side of the collection box 53, and an opening and closing component 565 is arranged on one side of the collection box 53, and the opening and closing component 565 is used to open or close the opening.

[0040] When cleaning the impurities deposited or adhered to the bottom of the sewage treatment tank 2 through the cleaning component 56, first start the power motor 562, and then the power motor 562 drives the driving screw 561 to rotate. The bucket 563 moves along the guide rod 564 with the rotation of the driving screw 561 under the guiding action of the guide rod 564, shoveling up the deposited impurities at the bottom of the sewage treatment tank 2 and moving them to the opening of the collection box 53. When the impurities enter the collection box 53, the opening and closing component 565 closes to prevent the impurities from scattering during the movement.

[0041] Exemplarily, referring to Figure 3 and Figure 4 , the opening and closing component 565 includes a closing door 5651 slidably connected along the height direction to one side of the opening of the collection box 53, and an electric telescopic rod 5652 is arranged between the closing door 5651 and the collection box 53.

[0042] When the bucket 563 moves the impurities to the opening of the collection box 53, the electric telescopic rod 5652 is started to drive the closing door 5651 to move along the height direction, opening the opening of the collection box 53 to allow the impurities to enter the collection box 53. After the cleaning is completed, the electric telescopic rod 5652 works in the reverse direction to drive the closing door 5651 to close the opening of the collection box 53 to prevent the impurities from scattering during the movement.

[0043] In some embodiments, referring to Figure 4 and Figure 5 , the flipping component 57 includes a rotating shaft 571 fixedly arranged on the flipping support frame 52, and the rotating shaft 571 is rotatably connected to the lifting support frame 51. A worm gear 572 is fixedly sleeved outside the rotating shaft 571, and a worm 573 is rotatably connected to the lifting support frame 51, and the worm 573 meshes with the worm gear 572; a flipping motor 574 is also arranged at one end of the worm 573.

[0044] When cleaning the impurities temporarily stored in the collection box 53 through the flipping component 57, first start the flipping motor 574, and then the flipping motor 574 drives the worm 573 to rotate. The worm 573 drives the worm gear 572 and the rotating shaft 571 to rotate, and the rotation of the rotating shaft 571 drives the flipping support frame 52 to flip, and the flipping support frame 52 drives the collection box 53 to flip from the horizontal position to the opening facing, facilitating the dumping or treatment of the impurities.

[0045] The present application also discloses a sewage treatment method, which is applicable to a sewage treatment system as described above, and its treatment steps are as follows: S1. Sewage enters the sedimentation tank through the inlet pipe 3, and suspended solids precipitate to the bottom by gravity to form primary sediment sludge.

[0046] S2. Then the sewage enters the aeration tank or biological filter for secondary treatment. The aeration tank promotes the growth of microorganisms and the decomposition of organic matter by injecting air or oxygen, while the biological filter uses the biofilm method to remove organic matter in the sewage through the biodegradation of microorganisms.

[0047] S3. The sewage after secondary treatment enters the chemical sedimentation tank to remove residual nutrients (such as nitrogen, phosphorus), etc. S31. On the one hand, the sludge generated during the treatment process enters the sludge thickening tank for thickening, and then is further dewatered by the sludge dewatering machine in the sludge thickening tank to form sludge cakes, which are transported to the outside for other uses. S31. On the other hand, the cleaning mechanism 5 can regularly transport the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter, and chemical sedimentation tank to the sludge thickening tank, and further dewater them by the sludge dewatering machine in the sludge thickening tank to form sludge cakes, which are transported to the outside for other uses; or the cleaning mechanism 5 can directly and regularly transport the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter, and chemical sedimentation tank to the outside for other uses.

[0048] S4. Chemical agents or physical methods are used to disinfect the sewage entering the disinfection tank to kill pathogens and ensure that the water quality meets the discharge or reuse standards.

[0049] S5. The disinfected sewage enters the sewage reuse tank, and after being deeply treated by membrane treatment technology, it can reach a higher water quality standard and be used for subsequent agricultural irrigation, industrial cooling, landscape water, etc.

[0050] S6. The automatic water supply mechanism 4 can automatically supply sewage to each sewage treatment tank 2 in real time to ensure that the liquid level of each tank is at the preset position.

[0051] The implementation principle of a sewage treatment system and its method in an embodiment of this application is as follows: When treating sewage, first, the sewage enters the sedimentation tank through the inlet pipe 3. Through the action of gravity, suspended solids settle to the bottom, forming primary sediment sludge. Then, the sewage enters the aeration tank or biological filter for secondary treatment. The aeration tank promotes the growth of microorganisms and the decomposition of organic matter by injecting air or oxygen. The biological filter uses the biofilm method to remove organic matter in the sewage through the biodegradation of microorganisms. The sewage after secondary treatment further enters the chemical sedimentation tank to remove residual nutrients (such as nitrogen, phosphorus), etc. The sludge generated during the treatment process enters the sludge thickening tank for thickening, and then is further dewatered by a sludge dehydrator in the sludge thickening tank to form sludge cakes. Then, chemical agents (such as chlorine, ozone) or physical methods (such as ultraviolet light) are used to disinfect the sewage entering the disinfection tank to kill pathogens, ensuring that the water quality meets the discharge or reuse standards. Finally, the disinfected sewage enters the sewage reuse tank, and after deep treatment of the sewage through membrane treatment technologies such as reverse osmosis and ultrafiltration, a higher water quality standard can be achieved, which can be used for subsequent agricultural irrigation, industrial cooling, landscape water, etc., thus realizing the recycling of water resources; among them, each sewage treatment tank 2 is arranged along the height direction of the frame 1, which not only reduces the occupied space of the sewage treatment system in the horizontal direction and improves the space utilization rate, but also the sewage can flow naturally between each sewage treatment tank 2 under the action of gravity. At the same time, the automatic water supply mechanism 4 can realize the automatic replenishment of sewage in each sewage treatment tank 2 to ensure that the liquid level in each tank is at the preset position and maintain the stable operation of the system. And the staff can regularly transport the pollutants and large impurities deposited at the bottom of the sedimentation tank, aeration tank, biological filter, and chemical sedimentation tank to the sludge thickening tank through the cleaning mechanism 5, and transport the compressed or dehydrated sludge in the sludge thickening tank to the outside for other uses (such as raw materials for cement, etc.), thereby increasing the effective volume of each sewage treatment tank 2 and improving the purification efficiency of the sewage treatment system.

[0052] The above are all the preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A sewage treatment system, characterized in that: include: Rack (1); The sewage treatment tanks (2) are provided in plurality and arranged at intervals along the height direction of the frame (1), and the plurality of sewage treatment tanks (2) are sequentially provided as a sedimentation tank, an aeration tank, a biological filter tank, a chemical sedimentation tank, a sludge concentration tank, a disinfection tank, and a sewage recycling tank; the sewage treatment tank (2) at the top is provided with a water inlet pipe (3); An automatic water replenishment mechanism (4) is arranged between two adjacent sewage treatment tanks (2) and is used to connect the adjacent sewage treatment tanks (2) and to make the liquid level in each sewage treatment tank (2) at a preset position; The cleaning mechanism (5) is arranged between the frame (1) and the plurality of sewage treatment tanks (2) and is used for regularly cleaning impurities deposited on the bottom of the plurality of sewage treatment tanks (2).

2. A sewage treatment system according to claim 1, characterized in that: The cleaning mechanism (5) comprises: A lifting support frame (51) is arranged between the frame (1) and the sewage treatment tank (2); The flip support frame (52) is rotatably connected to the lifting support frame (51); A collection box (53) is arranged on one side of the turning support frame (52); A lifting component (54) is arranged between the lifting support frame (51) and the frame (1) and is used to realize the lifting and lowering of the lifting support frame (51); A moving assembly (55) is disposed between the collecting box (53) and the turning support frame (52) and is used to drive the collecting box (53) to move to the inside or outside of the sewage treatment tank (2); A cleaning component (56) is disposed between the sewage treatment tank (2) and the collection box (53) and is used to move impurities deposited at the bottom of the sewage treatment tank (2) into the collection box (53); The turning assembly (57) is arranged between the lifting support frame (51) and the turning support frame (52) and is used to clean the impurities temporarily stored in the collection box (53).

3. A sewage treatment system according to claim 2, characterized in that: The lifting assembly (54) comprises: A lifting frame (541) is fixedly connected to the frame (1), and the lifting support frame (51) is slidably connected to the lifting frame (541); A lifting screw rod (542) is rotatably connected to the lifting frame (541) and is threadedly connected to the lifting support frame (51); The driving motor (543) is connected to the lifting screw (542).

4. A sewage treatment system according to claim 2, characterized in that: The moving assembly (55) comprises: The movable frame (551) is fixedly connected to the collection box (53) and is slidably connected to the turning support frame (52); The thrust device (552) is arranged between the flip support frame (52) and the movable frame (551), and is used to drive the movable frame (551) to move toward or away from the sewage treatment tank (2).

5. A sewage treatment system according to claim 2, characterized in that: The cleaning component (56) comprises: A driving screw rod (561) is rotatably connected to the sewage treatment tank (2), and a power motor (562) is disposed at one end of the driving screw rod (561); A bucket (563) threadedly connected to the drive screw (561); A guide rod (564) is fixedly connected to the interior of the sewage treatment tank (2) and is slidably connected to the bucket (563); The opening and closing component (565) is arranged on one side of the collection box (53). An opening is arranged on one side of the collection box (53). The opening and closing component (565) is used to open or close the opening.

6. A sewage treatment system according to claim 5, characterized in that: The opening and closing component (565) comprises: An opening and closing door (5651) is slidably connected to one side of the opening of the collection box (53) in a height direction; The electric telescopic rod (5652) is arranged between the opening and closing door (5651) and the collection box (53).

7. A sewage treatment system according to claim 2, characterized in that: The flip assembly (57) comprises: A rotating shaft (571) is fixedly connected to the flip support frame (52), and the rotating shaft (571) is rotatably connected to the lifting support frame (51); A worm wheel (572) is fixedly sleeved on the outer side of the rotating shaft (571); A worm (573) is rotatably connected to the lifting support frame (51) and meshes with the worm wheel (572); The turning motor (574) is arranged at one end of the worm (573).

8. A sewage treatment system according to claim 7, characterized in that: A conveyor belt (58) is also provided on one side of the frame (1), and a collecting hopper (59) is provided on the conveyor belt (58).

9. A sewage treatment system according to any one of claims 1 to 8, characterized in that: The automatic water replenishing mechanism (4) comprises: A communication pipe (41) is arranged between two adjacent sewage treatment tanks (2), and both the communication pipe (41) and the water inlet pipe (3) are provided with a solenoid valve (42); A liquid level sensor is arranged in the sewage treatment tank (2) and is used to detect the liquid level of sewage in the sewage treatment tank (2) and send a liquid level detection signal; The controller is electrically connected to the liquid level sensor and the electromagnetic valve (42) and is used to receive a liquid level detection signal to obtain the liquid level of the sewage in the sewage treatment tank (2). When the liquid level of the sewage in the sewage treatment tank (2) is lower than a preset height, the controller sends a control signal to the electromagnetic valve (42) so that the electromagnetic valve (42) opens to replenish water in the sewage treatment tank (2).

10. A method for treating sewage, characterized in that: A sewage treatment system applicable to any one of claims 1 to 9, wherein the treatment steps are as follows: S1, sewage enters the sedimentation tank through the water inlet pipe (3), and the suspended solids settle to the bottom by gravity to form primary sludge; S2. The sewage then enters the aeration tank or biofilter for secondary treatment. The aeration tank promotes the growth of microorganisms and the decomposition of organic matter by blowing in air or oxygen, while the biofilter uses the biofilm method to remove organic matter from the sewage through the biodegradation of microorganisms. S3, the wastewater after secondary treatment enters the chemical sedimentation tank to remove residual nutrients; S31, on the one hand, the sludge generated during the treatment process enters the sludge thickening tank for concentration, and then is further dehydrated by the sludge dewatering machine in the sludge thickening tank to form a mud cake and transport it to the outside for other uses; S31. On the other hand, the pollutants and large impurities precipitated at the bottom of the sedimentation tank, aeration tank, biological filter tank, and chemical sedimentation tank can be regularly transported to the sludge thickening tank through the cleaning mechanism (5), and further dehydrated by the sludge dehydrator in the sludge thickening tank to form a mud cake and transported to the outside for other use; or the pollutants and large impurities precipitated at the bottom of the sedimentation tank, aeration tank, biological filter tank, and chemical sedimentation tank can be directly and regularly transported to the outside for other use; S4. Use chemical agents or physical methods to disinfect the sewage entering the disinfection tank to kill pathogens and ensure that the water quality meets the discharge or reuse standards; S5. The disinfected sewage enters the sewage reuse pool. After deep treatment with membrane treatment technology, it can reach a higher water quality standard and be used for subsequent agricultural irrigation, industrial cooling, landscape water, etc. S6. The automatic water replenishment mechanism (4) can automatically replenish sewage into each sewage treatment pool (2) in real time to ensure that the liquid level of each pool is at a preset position.

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