A sewage treatment system and method thereof

Abstract

This application relates to a sewage treatment system and a method thereof, belonging to the technical field of pollutant purification and separation. The sewage treatment system includes a frame; a plurality of sewage treatment pools, which are arranged at intervals along the height direction of the frame, and the plurality of sewage treatment pools 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 pipeline is arranged on the sewage treatment pool at the top; an automatic water replenishment mechanism is arranged between two adjacent sewage treatment pools for connecting adjacent sewage treatment pools and keeping the liquid levels in each sewage treatment pool at a preset position; a cleaning mechanism is arranged between the frame and the plurality of sewage treatment pools for regularly cleaning the impurities deposited at the bottom of the plurality of sewage treatment pools. This application has the effects of reducing the occupied space of the sewage treatment system in the horizontal direction, improving the space utilization rate, and facilitating the staff to clean the sludge at the bottom of each treatment pool in a timely manner.

Description

Technical Field

[0001] This application relates to the technical field of pollutant purification and separation, and particularly 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 the 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, such as concentration, dewatering, and stabilization, 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 in-depth purification of sewage, and many other sewage treatment tanks; however, each sewage treatment tank usually occupies a large area and is laid flat on the ground, which will occupy a large 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:

[0006] In the first aspect, this application provides a sewage treatment system, including:

[0007] A frame;

[0008] Sewage treatment pools, with multiple numbers arranged at intervals along the height direction of the frame, and the multiple sewage treatment pools 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 pipeline is arranged on the sewage treatment pool at the top;

[0009] An automatic water replenishment mechanism, arranged between two adjacent sewage treatment pools, is used to connect adjacent sewage treatment pools and make the liquid levels in each sewage treatment pool at a preset position;

[0010] A cleaning mechanism, arranged between the frame and the multiple sewage treatment pools, is used to regularly clean the impurities deposited at the bottom of the multiple sewage treatment pools.

[0011] By adopting the above technical solutions, when treating sewage, first, the sewage enters the sedimentation tank through the inlet pipeline, and suspended solids precipitate to the bottom under the action of gravity to form primary sedimentation 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 sludge cakes. Then, chemical agents (such as chlorine, ozone) or physical methods (such as ultraviolet rays) 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 for subsequent agricultural irrigation, industrial cooling, landscape water use, etc., thereby realizing the recycling of water resources; among them, each sewage treatment pool 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 pool 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 pool, ensure that the liquid level in each pool 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 pool and improving the purification efficiency of the sewage treatment system.

[0012] Optionally, the cleaning mechanism includes:

[0013] A lifting support frame, arranged between the frame and the sewage treatment pool;

[0014] The flipping support frame is rotatably connected to the lifting support frame;

[0015] The collection box is arranged on one side of the flipping support frame;

[0016] The lifting assembly is arranged between the lifting support frame and the machine frame and is used to realize the lifting of the lifting support frame;

[0017] The moving assembly 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;

[0018] The cleaning assembly 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;

[0019] The flipping assembly is arranged between the lifting support frames and is used to clean the impurities temporarily stored in the collection box.

[0020] By adopting the above technical solution, 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 through the cleaning mechanism to increase the effective volume of each sewage treatment tank, first, the lifting assembly drives the lifting support frame to move to one side of the sewage treatment tank to be cleaned. Then, the moving assembly moves the collection box into the sewage treatment tank. Subsequently, the cleaning assembly moves the deposited impurities at the bottom of the sewage treatment tank into the collection box. After the impurities are collected, the moving assembly drives the collection box out of the sewage treatment tank. The impurities in the collection box can be directly dumped to a designated position for recycling through the lifting assembly and the flipping assembly, or can be moved to the sludge thickening tank for compression and dehydration before recycling; among them, through the coordinated use of the lifting assembly, flipping assembly, and moving assembly, 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 assembly, and moving assembly can realize the automatic collection of deposited impurities, improving the cleaning efficiency.

[0021] Optionally, the lifting assembly includes:

[0022] The lifting frame is fixedly arranged on the machine frame, and the lifting support frame is slidably connected to the lifting frame;

[0023] The lifting screw is rotatably connected to the lifting frame and is threadedly connected to the lifting support frame;

[0024] The driving motor is connected to the lifting screw.

[0025] By adopting the above technical solution, when the lifting support frame is driven by the lifting component 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; moreover, 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.

[0026] Optionally, the moving component includes:

[0027] A moving frame, fixedly arranged on the collection box and slidably connected to the flipping support frame;

[0028] A thrust device, arranged between the flipping support frame and the moving frame, and used for driving the moving frame to move towards the side close to or away from the sewage treatment tank.

[0029] 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, and the thrust device drives the moving frame and the collection box to horizontally move 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 by 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.

[0030] Optionally, the cleaning component includes:

[0031] A driving screw, rotatably connected to the sewage treatment tank, and a power motor is arranged at one end of the driving screw;

[0032] A bucket, threadedly connected to the driving screw;

[0033] A guiding rod, fixedly arranged inside the sewage treatment tank and slidably connected to the bucket;

[0034] 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, and the opening and closing component is used for opening or closing the opening.

[0035] By adopting the above technical solution, when cleaning the impurities deposited or adhered to the bottom of the sewage treatment tank by the cleaning component, first start the power motor, and then the power motor drives the driving screw to rotate. Under the guiding action of the guiding rod, the bucket moves along 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.

[0036] Optionally, the opening and closing component includes:

[0037] The opening and closing door is slidably connected to one side of the opening of the collection box along the height direction;

[0038] The electric telescopic rod is arranged between the opening and closing door and the collection box.

[0039] 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, allows the impurities to enter the collection box. After the cleaning is completed, the electric telescopic rod works in reverse to drive the opening and closing door to close the opening of the collection box, preventing the impurities from scattering during the movement.

[0040] Optionally, the flipping assembly includes:

[0041] The rotating shaft is fixedly arranged on the flipping support frame, and the rotating shaft is rotatably connected to the lifting support frame;

[0042] The worm gear is fixedly sleeved outside the rotating shaft;

[0043] The worm is rotatably connected to the lifting support frame and meshes with the worm gear;

[0044] The flipping motor is arranged at one end of the worm.

[0045] 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 orientation, facilitating the dumping or treatment of the impurities; among them, the worm gear and the worm have self-locking properties, 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.

[0046] Optionally, a conveyor belt is further arranged on one side of the frame, and an aggregate hopper is arranged on the conveyor belt.

[0047] 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 the 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.

[0048] Optionally, the automatic water replenishing mechanism includes:

[0049] The connecting pipe is connected between two adjacent sewage treatment ponds;

[0050] The solenoid valve is arranged on the connecting pipe and the water inlet pipe;

[0051] A liquid level sensor is arranged in the sewage treatment tank and is used to detect the liquid level height of the sewage in the sewage treatment tank and send out a liquid level height detection signal.

[0052] A controller is connected to the liquid level sensor and the solenoid valve. It is used to receive the liquid level height detection signal to know the liquid level height of the sewage in the sewage treatment tank. When the liquid level height of the sewage in the sewage treatment tank is lower than the preset height, the controller sends a control signal to the solenoid valve to open the solenoid valve to replenish water to the sewage treatment tank.

[0053] 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 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. 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, the automatic detection and water replenishment control of the liquid level of the sewage treatment tank are realized, thus 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.

[0054] 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:

[0055] S1. Sewage enters the sedimentation tank through the inlet pipe, and suspended solids precipitate to the bottom by gravity to form primary sedimentation sludge.

[0056] 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.

[0057] S3. The sewage after secondary treatment enters the chemical sedimentation tank to remove residual nutrients (such as nitrogen, phosphorus), etc.

[0058] 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 dehydrator in the sludge thickening tank to form a sludge cake and is transported to the outside for other uses.

[0059] S31. On the other hand, the cleaning mechanism 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 dehydrate them through the sludge dehydrator in the sludge thickening tank to form sludge cakes for external transportation and other uses; or the cleaning mechanism 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;

[0060] 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;

[0061] 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.;

[0062] S6. The automatic water replenishment mechanism can automatically replenish sewage into each sewage treatment tank in real time to ensure that the liquid level in each tank is at a preset position.

[0063] In summary, the present application includes at least one of the following beneficial technical effects:

[0064] Each sewage treatment tank is arranged along the height direction of the rack, which not only reduces the horizontal space occupied by the sewage treatment system and improves space utilization rate, but also enables the sewage to 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 to 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, 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;

[0065] Through the combined 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 combined use of the collection box, cleaning component, and moving component can realize the automatic collection of deposited impurities, improving the cleaning efficiency;

[0066] 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 entry of impurities onto the conveyor belt;

[0067] 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 issues 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 issues 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. Brief Description of the Drawings

[0068] Figure 1 is a schematic structural diagram of the sewage treatment system in this application;

[0069] Figure 2 is a schematic partial structural diagram showing the sewage treatment system;

[0070] Figure 3 is a schematic partial structural diagram showing the cleaning mechanism;

[0071] Figure 4 is a schematic partial structural diagram showing the open state of the opening and closing door;

[0072] Figure 5 is showing Figure 4 a partial enlarged structural diagram of part A in

[0073] Description of the Reference Numerals in the Drawings: 1, frame; 2, sewage treatment tank; 3, inlet pipeline; 4, automatic water replenishment 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 Description of the Embodiment

[0074] The following is combined with the attachedFigures 1-5 Further detailed description of this application will be given below.

[0075] 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. Along its height direction, a plurality of sewage treatment tanks 2 are fixedly arranged at intervals on the frame 1. The plurality of sewage treatment tanks 2 are successively arranged as a sedimentation tank, an aeration tank, a biological filter tank, a chemical sedimentation tank, a sludge thickening tank, a disinfection tank, and a sewage reuse tank. An inlet pipe 3 is also arranged on the top sewage treatment tank 2. A grille or sieve is arranged 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 the subsequent treatment units, reduce the load of the subsequent treatment equipment, and at the same time make it difficult for the subsequent treatment equipment to be blocked. An automatic water replenishment mechanism 4 is arranged between two adjacent sewage treatment tanks 2. The automatic water replenishment 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 arranged 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 also arranged on the frame. The lifting ladder 6 is used to facilitate the staff to reach various heights of the sewage treatment tank for operations such as feeding, equipment inspection, and maintenance.

[0076] When treating sewage, first, the sewage enters the sedimentation tank through the inlet pipe 3. Through the action of gravity, the suspended solids precipitate to the bottom to form primary sludge. Then the sewage enters the aeration tank or the 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. The biological filter tank uses the biofilm method to remove the 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. 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 tank, 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.

[0077] Next, 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, the automatic water replenishment mechanism 4 can realize the automatic replenishment of sewage in each sewage treatment tank 2, ensure that the liquid level in each tank is at a preset position, and maintain the stable operation of the system.

[0078] In some embodiments, referring to Figure 1 and Figure 2 , the automatic water replenishment mechanism 4 includes a communication pipeline 41 connecting two adjacent sewage treatment tanks 2, and electromagnetic valves 42 are provided on both the communication pipeline 41 and the water inlet pipeline 3. A liquid level sensor and a controller are provided 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 or 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.

[0079] The liquid level sensor continuously detects the liquid level height of the sewage in the sewage treatment tank 2. 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 2 needs to be replenished with water, the controller sends a control signal to the electromagnetic valve 42 to open the electromagnetic valve 42. The sewage in the communication pipeline 41 flows from the sewage treatment tank 2 with a higher liquid level to the sewage treatment tank 2 with a lower liquid level, realizing the automatic water replenishment of each sewage treatment tank 2. When the liquid level reaches the preset height, the controller sends a control signal to the electromagnetic valve 42 again to close the electromagnetic valve 42 and stop replenishing water.

[0080] In some embodiments, referring to Figure 3 and Figure 4, the cleaning mechanism 5 includes a lifting support frame 51 disposed between the frame 1 and the sewage treatment tank 2. A turning support frame 52 is rotatably connected to the lifting support frame 51, and a collection box 53 is disposed on one side of the turning support frame 52. A lifting assembly 54 is provided between the lifting support frame 51 and the frame 1, and the lifting assembly 54 is used to realize the lifting of the lifting support frame 51. A moving assembly 55 is provided between the collection box 53 and the turning support frame 52, and the moving assembly 55 is used to drive the collection box 53 to move inside or outside the sewage treatment tank 2. A cleaning assembly 56 is provided between the sewage treatment tank 2 and the collection box 53, and the cleaning assembly 56 is used to move the impurities deposited at the bottom of the sewage treatment tank 2 into the collection box 53. A turning assembly 57 is provided between the lifting support frames 51, and the turning assembly 57 is used to clean the impurities temporarily stored in the collection box 53. A conveyor belt 58 is further provided on one side of the frame 1, and the conveyor belt 58 can continuously and automatically convey the impurities dumped from the collection box 53. An aggregate hopper 59 is provided 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 entry of the impurities onto the conveyor belt 58.

[0081] 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 into 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 assembly 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 assembly 55. Subsequently, the cleaning assembly 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 assembly 55 drives the collection box 53 to move 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 assembly 54 and the turning assembly 57, or can be moved to the sludge thickening tank for compression and dehydration before recycling.

[0082] In some embodiments, referring to Figure 3 and Figure 4 , the lifting assembly 54 includes a lifting frame 541 fixed to the frame 1. Exemplarily, a lifting rod is fixed to 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.

[0083] 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. Moreover, 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.

[0084] 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 with 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 towards one side close to or far 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.

[0085] 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 downwards 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 towards the side far from the sewage treatment tank 2, so that the collection tank 53 can be moved out of the sewage treatment tank 2.

[0086] In some embodiments, referring to Figure 3 and Figure 4 , the cleaning assembly 56 includes a driving screw 561 rotatably connected in 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. A guiding rod 564 is fixedly arranged inside the sewage treatment tank 2, and the guiding rod 564 is slidably connected with the bucket 563. An opening is arranged on one side of the collection tank 53, and an opening and closing member 565 is arranged on one side of the collection tank 53. The opening and closing member 565 is used to open or close the opening.

[0087] 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. Then, the power motor 562 drives the driving screw 561 to rotate. Under the guiding action of the guiding rod 564, the bucket 563 moves along the guiding rod 564 as the driving screw 561 rotates, 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.

[0088] Exemplarily, referring to Figure 3 and Figure 4 , the opening and closing component 565 includes a closing door 5651 slidably connected to one side of the opening of the collection box 53 in the height direction. An electric telescopic rod 5652 is provided between the closing door 5651 and the collection box 53.

[0089] 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 in 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.

[0090] In some embodiments, referring to Figure 4 and Figure 5 , the flipping component 57 includes a rotating shaft 571 fixed on the flipping support frame 52. 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. A worm 573 is rotatably connected to the lifting support frame 51. The worm 573 meshes with the worm gear 572; one end of the worm 573 is also provided with a flipping motor 574.

[0091] When cleaning the impurities temporarily stored in the collection box 53 through the flipping component 57, first start the flipping motor 574. 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. 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 orientation, facilitating the dumping or treatment of the impurities.

[0092] This application also discloses a sewage treatment method applicable to a sewage treatment system as described above. The treatment steps are as follows:

[0093] S1. Sewage enters the sedimentation tank through the inlet pipe 3, and suspended solids precipitate to the bottom by gravity to form primary sedimentation sludge.

[0094] S2. Subsequently, the sewage enters the aeration tank or biological filter for secondary treatment. In the aeration tank, air or oxygen is blown in to promote the growth of microorganisms and the decomposition of organic matter. The biological filter uses the biofilm method to remove organic matter in the sewage through the biodegradation of microorganisms.

[0095] S3. The sewage after secondary treatment enters the chemical sedimentation tank to remove residual nutrients (such as nitrogen, phosphorus), etc.

[0096] 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, which are transported to the outside for other uses.

[0097] 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 dehydrate them through the sludge dehydrator 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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 the 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 in-depth 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., thereby 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 space occupied by 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, ensuring that the liquid level in each tank is at the preset position and maintaining the stable operation of the system. Moreover, the staff can regularly use the cleaning mechanism 5 to 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 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.

[0102] The above are all the preferred embodiments of this application. It does 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, Including: Frame (1); Sewage treatment ponds (2), with multiple numbers arranged at intervals along the height direction of the frame (1), and the multiple sewage treatment ponds (2) are successively set as sedimentation ponds, aeration ponds, biological filter ponds, chemical sedimentation ponds, sludge thickening ponds, disinfection ponds, and sewage reuse ponds; an inlet pipe (3) is arranged on the sewage treatment pond (2) at the top; Automatic water replenishing mechanism (4), arranged between two adjacent sewage treatment ponds (2), used to connect adjacent sewage treatment ponds (2) and make the liquid levels in each sewage treatment pond (2) at a preset position; Cleaning mechanism (5), arranged between the frame (1) and the multiple sewage treatment ponds (2), used to regularly clean the impurities deposited at the bottom of the multiple sewage treatment ponds (2); The cleaning mechanism (5) includes: Lifting support frame (51), arranged between the frame (1) and the sewage treatment pond (2); Flipping support frame (52), rotatably connected to the lifting support frame (51); Collection box (53), arranged on one side of the flipping support frame (52); Lifting component (54), arranged between the lifting support frame (51) and the frame (1), used to realize the lifting of the lifting support frame (51); Moving component (55), arranged between the collection box (53) and the flipping support frame (52), used to drive the collection box (53) to move inside or outside the sewage treatment pond (2); Cleaning component (56), arranged between the sewage treatment pond (2) and the collection box (53), used to move the impurities deposited at the bottom of the sewage treatment pond (2) into the collection box (53); Flipping component (57), arranged between the lifting support frame (51) and the flipping support frame (52), used to clean the impurities temporarily stored in the collection box (53).

2. The sewage treatment system according to claim 1, characterized in that, The lifting component (54) includes: Lifting frame (541), fixedly connected to the frame (1), and the lifting support frame (51) is slidably connected to the lifting frame (541); Lifting screw (542), rotatably connected to the lifting frame (541) and threadedly connected to the lifting support frame (51); Drive motor (543), connected to the lifting screw (542).

3. The sewage treatment system according to claim 1, characterized in that, The moving component (55) includes: Moving frame (551), fixedly connected to the collection box (53) and slidably connected to the flipping support frame (52); Thrust device (552), arranged between the flipping support frame (52) and the moving frame (551), used to drive the moving frame (551) to move towards or away from the sewage treatment pond (2).

4. A sewage treatment system according to claim 1, characterized in that, The cleaning component (56) includes: Drive screw (561), rotatably connected to the sewage treatment pond (2), and a power motor (562) is arranged at one end of the drive screw (561); Bucket (563), threadedly connected to the drive screw (561); Guide rod (564), fixedly connected inside the sewage treatment pond (2) and slidably connected to the bucket (563); Opening and closing component (565), arranged on one side of the collection box (53), and an opening 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.

5. A sewage treatment system according to claim 4, characterized in that, The opening and closing component (565) includes: The opening and closing door (5651) is slidably connected to one side of the opening of the collection tank (53) in the height direction; The electric telescopic rod (5652) is arranged between the opening and closing door (5651) and the collection tank (53).

6. A sewage treatment system according to claim 1, characterized in that, The flipping assembly (57) includes: The rotating shaft (571) is fixedly connected to the flipping support frame (52), and the rotating shaft (571) is rotatably connected to the lifting support frame (51); The worm gear (572) is fixedly sleeved outside the rotating shaft (571); The worm (573) is rotatably connected to the lifting support frame (51) and meshes with the worm gear (572); The flipping motor (574) is arranged at one end of the worm (573).

7. A sewage treatment system according to claim 6, characterized in that, A conveyor belt (58) is further arranged on one side of the frame (1), and an aggregate hopper (59) is arranged on the conveyor belt (58).

8. A sewage treatment system according to any one of claims 1 to 7, characterized in that, The automatic water replenishing mechanism (4) includes: The connecting pipe (41) is arranged between two adjacent sewage treatment tanks (2), and electromagnetic valves (42) are arranged on both the connecting pipe (41) and the water inlet pipe (3); The liquid level sensor is arranged in the sewage treatment tank (2) and 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 controller is electrically connected to the liquid level sensor and the electromagnetic valve (42) at the same time 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).

9. A sewage treatment method, characterized in that, Applicable to a sewage treatment system as described in any one of the above claims 1-8, the treatment steps are as follows: S1. Sewage enters the sedimentation tank through the water inlet pipe (3), and suspended solids precipitate to the bottom by gravity to form primary sediment 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; 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 a sludge cake and is 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 are regularly transported to the sludge thickening tank by the cleaning mechanism (5) and are further dehydrated by the sludge dehydrator in the sludge thickening tank to form a sludge cake and are 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 are directly regularly transported to the outside by the cleaning mechanism (5) for other uses; S4. The sewage entering the disinfection tank is disinfected by using chemical agents or physical methods to kill pathogens to ensure that the water quality meets the discharge or reuse standards; S5. The disinfected sewage enters the sewage reuse pool, and the sewage is deeply treated by membrane treatment technology, that is, it reaches a relatively high water quality standard and is used for subsequent agricultural irrigation, industrial cooling, and landscape water use. S6. The automatic water replenishment mechanism (4) automatically replenishes 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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