AOA assembly type sewage treatment equipment with adjustable single-double backflow

Abstract

The invention discloses single-double-backflow adjustable AOA assembly type sewage treatment equipment, and belongs to the field of sewage treatment equipment.The sewage treatment equipment comprises a box body, an anaerobic tank, an aerobic tank, an anoxic tank, a secondary sedimentation tank and a disinfection tank are arranged in the box body in the sewage flowing direction, a stirring structure is arranged in the anaerobic tank, and a stirring structure is arranged in the disinfection tank; the stirring structure comprises a driven rotating rod rotationally arranged at the bottom in the anaerobic tank, fixed sleeves symmetrically and fixedly arranged on the driven rotating rod in a sleeving manner, a plurality of stirring rods fixedly connected to the fixed sleeves in an annular array manner, stirring plates fixedly connected to the tail ends of the stirring rods, and a driving mechanism for driving the stirring rods to rotate. Through rotation of the stirring structure, sewage in the anaerobic tank is fully stirred, sludge is not easy to precipitate, and the contact area between the sewage and microorganisms is increased, so that the biodegradation efficiency is improved. Gravitational potential energy generated when sewage flows in is used as a driving source, so that the energy consumption is reduced, and the green and sustainable environmental protection concept is met.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment equipment, and in particular to an AOA assembled sewage treatment equipment with adjustable single and double reflux. Background Art

[0002] Sewage treatment equipment is an important facility in the field of environmental protection and water resources management. Its performance and treatment efficiency are directly related to the effluent quality and environmental protection effect. The anaerobic tank is a key component in the sewage treatment process. Its function is to provide an anaerobic environment so that microorganisms can convert organic matter in the influent into internal carbon sources and release phosphates.

[0003] However, in existing sewage treatment equipment, the anaerobic tank often lacks an effective stirring structure, which easily leads to the accumulation of sludge in the sewage inside the anaerobic tank. Sludge accumulation not only affects the effective volume of the anaerobic tank, but also reduces the mixing efficiency of sludge and sewage, thereby affecting the metabolic activity of microorganisms and the conversion efficiency of organic matter. Long-term sludge accumulation may even cause the internal volume of the anaerobic tank to gradually decrease, resulting in a decrease in the treatment capacity of the entire sewage treatment system. Since the sludge stays in the anaerobic tank for too long, some substances that are not conducive to the growth of microorganisms, such as hydrogen sulfide, may be produced. These substances will not only inhibit the activity of microorganisms, but may also cause corrosion and damage to the structure of the sewage treatment equipment.

[0004] Therefore, the present application provides an AOA assembled sewage treatment equipment with adjustable single and double reflux to solve the above problems. Summary of the invention

[0005] The present application provides an AOA assembled sewage treatment equipment with adjustable single and double reflows, which aims to solve the problem that in the existing sewage treatment equipment mentioned in the background technology, the anaerobic tank often lacks an effective stirring structure, which easily leads to the sludge in the sewage being easily silted up inside the anaerobic tank. Sludge siltation not only affects the effective volume of the anaerobic tank, but also reduces the mixing efficiency of sludge and sewage, thereby affecting the metabolic activity of microorganisms and the conversion efficiency of organic matter.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: an AOA assembled sewage treatment equipment with adjustable single and double reflows, comprising a housing, wherein an anaerobic tank, an aerobic tank, an anoxic tank, a secondary sedimentation tank and a disinfection tank are arranged inside the housing along the sewage flow direction, the anaerobic tank is provided with a stirring structure, the aerobic tank is provided with an aeration system, and the anoxic tank is provided with an intermittent gas stirring mechanism; a double sludge reflow system is also arranged inside the housing; wherein the anaerobic tank, the aerobic tank and the anoxic tank constitute a biochemical tank. The anaerobic tank is used in the non-oxygenated zone of the biological reaction tank and in the area where no nitrate or nitrite exists. Polyphosphate microorganisms absorb organic matter and release phosphorus in the anaerobic zone. The aerobic tank is used in the oxygenated zone of the biological reaction tank. Microorganisms degrade organic matter and carry out nitrification in the aerobic zone. The anoxic tank is used in the non-oxygenated zone of the biological reaction tank and in the area where nitrate or nitrite exists.

[0007] In order to prevent the sludge from settling inside the anaerobic tank: the stirring structure includes a driven rotating rod rotatably arranged at the bottom of the anaerobic tank, a fixed sleeve symmetrically fixedly mounted on the driven rotating rod, a plurality of stirring rods fixedly connected to the fixed sleeve in an annular array, a stirring plate fixedly connected to the end of the stirring rod, and a driving mechanism for driving the stirring rod to rotate; the driving mechanism includes a driving rotating rod rotatably arranged at the top of the anaerobic tank, a mounting seat fixedly mounted on the driving rotating rod, a plurality of support rods fixedly connected to the mounting seat in an annular array, a conical bowl fixedly connected to the end of the support rod, synchronous gears fixedly mounted on the driving rotating rod and the driven rotating rod respectively, and a synchronous belt meshingly mounted on the two synchronous gears. When sewage flows into the anaerobic tank, the sewage first falls into the conical bowl. Due to the design of the conical bowl, downward pressure is generated when sewage flows in, causing the conical bowl and its connected support rods and mounting seat to move downward as a whole. In this process, the driving rotating rod on the mounting seat rotates counterclockwise. Through the transmission of the synchronous gear and the synchronous belt, the driven rotating rod also rotates counterclockwise, driving the fixed sleeve, the stirring rod and the stirring plate to rotate together. The rotation of the stirring plate stirs the sewage at the bottom of the anaerobic tank, effectively preventing the sedimentation of sludge. In actual use, when sewage continues to flow into the anaerobic tank, the stirring structure will continue to work to keep the sewage in the anaerobic tank in a stirring state. This design not only improves the sewage treatment efficiency, but also reduces the use of traditional drive motors and reduces operating costs. At the same time, the compact design and easy maintenance of the stirring structure also make it widely applicable in practical applications.

[0008] Preferably, in order to reduce the resistance of the conical bowl when flowing in water: the end of the conical bowl away from its opening is processed into a curved surface. The curved surface design allows the water flow to flow more smoothly along the surface of the conical bowl, reducing the turbulence of the water flow and the loss of energy.

[0009] Preferably, in order to facilitate the flow purification of sewage in the box: one end of the box is fixedly connected with an inlet pipe extending into the anaerobic tank, the outlet end of the inlet pipe corresponds to the top of the conical bowl, a first connecting port is opened on the top between the anaerobic tank and the aerobic tank, a second connecting port is opened on the top between the aerobic tank and the anoxic tank, a third connecting port is opened on the top between the anoxic tank and the secondary sedimentation tank, a fourth connecting port is opened on the top between the secondary sedimentation tank and the disinfection tank, and the other end of the box is fixedly connected with an outlet pipe extending into the disinfection tank. By designing the position and shape of the connecting ports between the various treatment tanks, it is ensured that the sewage can flow smoothly and efficiently between the various treatment tanks, thereby improving the overall treatment efficiency.

[0010] Preferably, in order to facilitate the blocking of sludge between the various ports: a filter is fixedly installed inside the first port and the second port. The filter is made of corrosion-resistant, high-strength material and can withstand the scouring of sewage and the clogging pressure of sludge for a long time. The filter can effectively block the aerobic biological filler in the aerobic tank and ensure that the sewage passes smoothly without clogging.

[0011] Preferably, the aeration system includes a pipeline arranged in the aerobic tank, a first air duct plugged into the box and connected to the pipeline, a first solenoid valve fixedly mounted on the first air duct, and an aerator fixedly mounted on the box and connected to the first air duct.

[0012] Preferably, the intermittent gas stirring mechanism includes a perforated aeration pipe arranged in the anoxic tank, a second air pipe plugged into the box and connected to the perforated aeration pipe, and a fifth solenoid valve fixedly mounted on the second air pipe, wherein one end of the second air pipe away from the perforated aeration pipe is connected to the output end of the aerator. By optimizing the intermittent gas stirring mechanism and utilizing the control of the fifth solenoid valve, intermittent pneumatic stirring is performed to accelerate the degradation of organic matter and nitrification reaction of microorganisms in the aerobic zone, thereby improving the sewage treatment efficiency.

[0013] Preferably, a conical sedimentation hopper is provided at the bottom of the secondary sedimentation tank, a grille baffle is provided at the top of the secondary sedimentation tank, a liquid guide tube extending to the top of the conical sedimentation hopper port is plugged on the grille baffle, and the inlet end of the liquid guide tube is connected to the third port. The design of the conical sedimentation hopper makes full use of gravity, so that the suspended matter can be quickly deposited at the bottom of the hopper, thereby improving the sedimentation efficiency. The grille baffle effectively blocks large pieces of suspended matter or floating matter from entering the liquid guide tube, ensuring the clarity and quality of the supernatant.

[0014] Preferably, in order to facilitate the treatment of the sludge in the secondary sedimentation tank: the dual sludge return system includes a sludge return pump arranged inside the secondary sedimentation tank and connected to the interior of the conical sedimentation hopper, and a first sludge return pipe fixedly plugged on the box body and connected to the sludge return pump, the end of the first sludge return pipe extends to the interior of the anaerobic tank, and a second solenoid valve is fixedly installed on the first sludge return pipe.

[0015] Preferably, the dual sludge return system further includes a second sludge return pipe fixedly arranged on the first sludge return pipe corresponding to the sludge return pump and the second solenoid valve, the end of the second sludge return pipe is fixedly plugged into the box and extends to the interior of the anoxic tank, and a third solenoid valve is fixedly installed on the second sludge return pipe. Through the flexible adjustment of the dual sludge return system, the sludge return path can be optimized according to different water quality and treatment requirements, and the efficiency and effect of biological treatment can be improved. At the same time, it is convenient to discharge the sludge in the conical sedimentation hopper.

[0016] Preferably, a mud discharge pipe is fixedly arranged on the first sludge return pipe corresponding to the sludge return pump and the second solenoid valve and connected thereto, and a fourth solenoid valve is fixedly installed on the mud discharge pipe.

[0017] The present invention fully stirs the sewage in the anaerobic tank by rotating the stirring structure, and the sludge is not easy to settle, thereby increasing the contact area between the sewage and the microorganisms, thereby improving the biodegradation efficiency. The gravitational potential energy generated when the sewage flows in is used as the driving source, which reduces the use of traditional driving motors and reduces energy consumption, and conforms to the green and sustainable environmental protection concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an AOA assembled sewage treatment equipment with adjustable single and double reflux;

[0019] Figure 2 for Figure 1 Schematic diagram of the internal structure of the anaerobic tank;

[0020] Figure 3 for Figure 2 A side view of the structure in FIG.

[0021] Figure 4 for Figure 1 Schematic diagram of the structure inside the middle box;

[0022] Figure 5 for Figure 1 Schematic diagram of the other side of the structure;

[0023] Figure 6 for Figure 5 Schematic diagram of the internal structure of the secondary sedimentation tank.

[0024] In the figure:

[0025] 1. Box; 11. Anaerobic tank; 111. First port; 12. Aerobic tank; 121. Second port; 13. Anoxic tank; 131. Third port; 14. Second sedimentation tank; 141. Fourth port; 142. Conical sedimentation hopper; 143. Grille baffle; 144. Liquid guide tube; 15. Disinfection tank; 16. Water inlet pipe; 17. Water outlet pipe; 2. Stirring structure; 21. Driven rotating rod; 22. Fixed sleeve; 23. Stirring rod; 24. Stirring plate; 25. Driving mechanism; 251. Driving rotating rod; 252. Mounting seat; 253. Support rod; 254, conical bowl; 255, synchronous gear; 256, synchronous belt; 3, aeration system; 31, pipeline; 32, first air duct; 33, first solenoid valve; 34, aerator; 4, double sludge return system; 41, sludge return pump; 42, first sludge return pipe; 421, second solenoid valve; 43, second sludge return pipe; 431, third solenoid valve; 5, filter screen; 6, sludge discharge pipe; 61, fourth solenoid valve; 7, intermittent gas stirring mechanism; 71, perforated aeration pipe; 72, second air duct; 73, fifth solenoid valve. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] This embodiment provides an AOA assembled sewage treatment equipment with adjustable single and double reflux, such as Figure 1-6As shown, the sewage treatment equipment includes a housing 1, and an anaerobic tank 11, an aerobic tank 12, an anoxic tank 13, a secondary sedimentation tank 14 and a disinfection tank 15 are arranged inside the housing 1 along the sewage flow direction, and a stirring structure 2 is arranged inside the anaerobic tank 11, an aeration system 3 is arranged inside the aerobic tank 12, and an intermittent gas stirring mechanism 7 is arranged inside the anoxic tank 13; a double sludge return system 4 is also arranged inside the housing 1; wherein, the anaerobic tank 11, the aerobic tank 12 and the anoxic tank 13 constitute a biochemical tank. The anaerobic tank 11 is used in the non-oxygenated area of ​​the biological reaction tank, and in the area where no nitrate or nitrite exists. Polyphosphate microorganisms absorb organic matter and release phosphorus in the anaerobic area. The aerobic tank 12 is used in the oxygenated area of ​​the biological reaction tank. Microorganisms degrade organic matter and perform nitrification reaction in the aerobic area. The anoxic tank 13 is used in the non-oxygenated area of ​​the biological reaction tank, and in the area where nitrate or nitrite exists. The biological reaction pool contains a large amount of nitrate and nitrite. When sufficient organic matter is obtained, denitrification reaction can be carried out in this area. The typical process of the AOA process package is that the sewage flows through the anaerobic-aerobic-anoxic (AOA) biological reaction pool in the biochemical pool in turn, and the organic matter and nitrogen and phosphorus nutrients in the water are efficiently removed during nitrification, denitrification, phosphorus release and phosphorus absorption. The effluent from the biochemical pool enters the secondary sedimentation tank 14 for mud and water separation, the supernatant is discharged, and the bottom sludge is divided into two routes to return to the anaerobic tank 11 and the anoxic tank 13, and the remaining part is discharged as residual sludge to the sludge dewatering system.

[0028] Among them, in order to improve the sewage treatment effect in the aerobic pool 12: aerobic biological fillers are also arranged inside the aerobic pool 12 as a mobile biological bed. The gaps in each filler are hung on the filler biofilm, filling the entire gap, realizing the three structural layers of anaerobic-aerobic-anoxic on the filler biofilm, realizing simultaneous nitrification and denitrification in the aerobic pool 12, and increasing the removal efficiency of COD, ammonia nitrogen, and total nitrogen. By integrating the three structural layers of anaerobic-aerobic-anoxic, aerobic biological fillers significantly improve the efficiency of sewage treatment and increase the removal rate of COD (chemical oxygen demand), ammonia nitrogen, and total nitrogen. When sewage enters the aerobic pool 12, it first contacts the microorganisms on the surface of the filler. These microorganisms use organic matter in the sewage as a nutrient source for growth and reproduction. As the sewage flows, it gradually penetrates into the filler, and successively undergoes the three treatment stages of anaerobic-aerobic-anoxic. In the anaerobic structure layer, phosphorus-accumulating microorganisms absorb organic matter and release phosphorus; in the aerobic structure layer, microorganisms degrade organic matter and carry out nitrification reaction; in the anoxic structure layer, the anoxic pool 13 contains a large amount of nitrate and nitrite. When sufficient organic matter is obtained, denitrification reaction can be carried out in this area. Through this process, in the process of nitrification, denitrification, phosphorus release and phosphorus absorption, efficient removal of organic matter and nitrogen and phosphorus nutrients in water is achieved.

[0029] In order to prevent the sludge from settling inside the anaerobic tank 11: the stirring structure 2 includes a driven rotating rod 21 rotatably arranged at the bottom of the anaerobic tank 11, a fixed sleeve 22 symmetrically fixedly sleeved on the driven rotating rod 21, a plurality of stirring rods 23 fixedly connected to the fixed sleeve 22 in an annular array, a stirring plate 24 fixedly connected to the end of the stirring rod 23, and a driving mechanism 25 for driving the stirring rod 23 to rotate; the driving mechanism 25 includes a driving rotating rod 251 rotatably arranged at the top of the anaerobic tank 11, a mounting seat 252 fixedly sleeved on the driving rotating rod 251, a plurality of supporting rods 253 fixedly connected to the mounting seat 252 in an annular array, a conical bowl 254 fixedly connected to the end of the supporting rod 253, a synchronous gear 255 fixedly sleeved on the driving rotating rod 251 and the driven rotating rod 21 respectively, and a synchronous belt 256 meshingly sleeved on the two synchronous gears 255. By rotating the stirring structure 2, the sewage in the anaerobic tank 11 is fully stirred, the sludge is not easy to settle, the contact area between the sewage and the microorganisms is increased, and the biodegradation efficiency is improved. The gravitational potential energy generated when the sewage flows in is used as the driving source, which reduces the use of traditional drive motors and reduces energy consumption, and conforms to the green and sustainable environmental protection concept. When the sewage flows into the anaerobic tank 11, the sewage first falls into the conical bowl 254. Due to the design of the conical bowl 254, downward pressure is generated when the sewage flows in, so that the conical bowl 254 and its connected support rod 253 and mounting seat 252 move downward as a whole. In this process, the driving rotating rod 251 on the mounting seat 252 rotates counterclockwise. Through the transmission of the synchronous gear 255 and the synchronous belt 256, the driven rotating rod 21 also rotates counterclockwise, driving the fixed sleeve 22, the stirring rod 23 and the stirring plate 24 to rotate together. The rotation of the stirring plate 24 stirs the sewage at the bottom of the anaerobic tank 11, effectively preventing the precipitation of sludge. In actual use, when sewage continues to flow into the anaerobic tank 11, the stirring structure 2 will continue to work to keep the sewage in the anaerobic tank 11 in a stirring state. This design not only improves the sewage treatment efficiency, but also reduces the use of traditional drive motors and reduces operating costs. At the same time, the compact design and easy maintenance of the stirring structure 2 also make it widely applicable in practical applications.

[0030] Specifically, in order to reduce the resistance of the conical bowl 254 when it flows in water: the end of the conical bowl 254 away from its opening is processed into a curved surface. This design not only makes the conical bowl 254 flow more smoothly in the sewage, reduces unnecessary resistance, but also improves its stability and dynamic performance in water. The curved surface design allows the water flow to flow more smoothly along the surface of the conical bowl 254, reducing the turbulence of the water flow and the loss of energy.

[0031] Specifically, in order to facilitate the flow purification of sewage in the box 1: one end of the box 1 is fixedly connected with an inlet pipe 16 extending into the anaerobic tank 11, and the outlet end of the inlet pipe 16 corresponds to the top of the conical bowl 254. A first opening 111 is provided at the top between the anaerobic tank 11 and the aerobic tank 12, a second opening 121 is provided at the top between the aerobic tank 12 and the anoxic tank 13, a third opening 131 is provided at the top between the anoxic tank 13 and the secondary sedimentation tank 14, and a fourth opening 141 is provided at the top between the secondary sedimentation tank 14 and the disinfection tank 15. The other end of the box 1 is fixedly connected with an outlet pipe 17 extending into the disinfection tank 15. By designing the position and shape of the connecting ports between the various treatment tanks, it is ensured that the sewage can flow smoothly and efficiently between the various treatment tanks, thereby improving the overall treatment efficiency. The connecting ports are set at appropriate positions to effectively avoid the back-mixing of sludge and sediment between different treatment tanks, and maintain the treatment effect of each treatment tank. Specifically, one end of the housing 1 is fixedly connected with an inlet pipe 16 extending into the anaerobic tank 11, and the outlet end of the inlet pipe 16 precisely corresponds to the top of the conical bowl 254. It is ensured that the sewage can directly impact the conical bowl 254, so as to make full use of the gravitational potential energy of the sewage to drive the rotation of the stirring structure 2, and at the same time, the polyphosphate microorganisms in the sewage absorb organic matter and release phosphorus in the anaerobic tank 11. A first connecting port 111 is opened at the top between the anaerobic tank 11 and the aerobic tank 12, allowing the sewage after anaerobically treated to flow smoothly into the aerobic tank 12, so that the microorganisms can degrade organic matter and carry out nitrification reaction in the aerobic zone. A second connecting port 121 is opened at the top between the aerobic tank 12 and the anoxic tank 13, so that the sewage after aerobic treatment can flow smoothly into the anoxic tank 13 for denitrification reaction. A third connecting port 131 is opened at the top between the anoxic tank 13 and the secondary sedimentation tank 14. It ensures that the sewage after the anoxic biological denitrification reaction can flow smoothly into the secondary sedimentation tank 14 for solid-liquid separation. The sludge and sediment in the secondary sedimentation tank 14 will be deposited at the bottom, and the clean water will flow into the disinfection tank 15 through the upper outlet. Finally, a fourth port 141 is opened at the top between the secondary sedimentation tank 14 and the disinfection tank 15. The clean water after sedimentation treatment flows into the disinfection tank 15 through this port for final disinfection treatment. The disinfected clean water is discharged through the outlet pipe 17 at the other end of the box 1 for subsequent use. The entire treatment process is efficient and stable, ensuring the high quality of the effluent water.

[0032] More specifically, in order to facilitate the interception of sludge between the various openings: a filter screen 5 is fixedly installed inside the first opening 111 and the second opening 121. The filter screen 5 is made of corrosion-resistant, high-strength material, and can withstand the scouring of sewage and the clogging pressure of sludge for a long time. The aperture size of the filter screen 5 has been carefully calculated, which can not only effectively block the aerobic biological filler in the aerobic tank 12, but also ensure that the sewage passes smoothly without clogging. During the specific installation, the filter screen 5 is firmly fixed on the inner side of each opening and fits tightly with the edge of the opening.

[0033] Specifically, the aeration system 3 includes a pipe 31 arranged in the aerobic tank 12, a first air duct 32 plugged into the housing 1 and connected to the pipe 31, a first solenoid valve 33 fixedly mounted on the first air duct 32, and an aerator 34 fixedly mounted on the housing 1 and connected to the first air duct 32. Through the aeration system 3, under the control of the first solenoid valve 33, pneumatic stirring is performed to accelerate the degradation of organic matter and nitrification reaction of microorganisms in the aerobic zone, thereby improving the sewage treatment efficiency. When the aerator 34 is started, it generates a stable airflow, which is transmitted to the pipe 31 through the first air duct 32 and ejected through the pipe 31 to release the airflow into the sewage in the form of tiny bubbles. These bubbles form tiny upwellings in the sewage, which not only increase the dissolved oxygen content in the sewage, but also promote the contact and mixing between the sewage and the microorganisms, thereby accelerating the degradation of organic matter and nitrification reaction of the microorganisms in the aerobic zone.

[0034] Specifically, the intermittent gas stirring mechanism 7 includes a perforated aeration pipe 71 arranged in the anoxic tank 13, a second air guide pipe 72 plugged into the housing 1 and connected to the perforated aeration pipe 71, and a fifth solenoid valve 73 fixedly mounted on the second air guide pipe 72. The end of the second air guide pipe 72 away from the perforated aeration pipe 71 is connected to the output end of the aerator 34. By optimizing the intermittent gas stirring mechanism 7 and using the control of the fifth solenoid valve 73, intermittent pneumatic stirring is performed to accelerate the denitrification reaction of microorganisms in the anoxic zone, thereby improving the sewage treatment efficiency. When the aerator 34 is started, it generates a stable airflow, which is transmitted to the perforated aeration pipe 71 through the second air guide pipe 72 and ejected through the perforated aeration pipe 71 to release the airflow into the sewage in the form of tiny bubbles. These bubbles form tiny upwellings in the sewage, which not only increase the dissolved oxygen content in the sewage, but also promote the contact and mixing between the sewage and the microorganisms, thereby accelerating the denitrification reaction of the microorganisms in the anoxic zone.

[0035] Specifically, a conical sedimentation hopper 142 is provided at the bottom of the secondary sedimentation tank 14, and a grille baffle 143 is provided at the top of the secondary sedimentation tank 14. A liquid guide tube 144 extending to the top of the port of the conical sedimentation hopper 142 is plugged on the grille baffle 143, and the inlet end of the liquid guide tube 144 is connected to the third port 131. The design of the conical sedimentation hopper 142 makes full use of the effect of gravity, so that the suspended matter can be quickly deposited at the bottom of the hopper, thereby improving the sedimentation efficiency. The grille baffle 143 effectively blocks large pieces of suspended matter or floating matter from entering the liquid guide tube 144, ensuring the clarity and quality of the supernatant. The bottom of the conical sedimentation hopper 142 facilitates the collection and discharge of sludge, reducing the difficulty and cost of sludge treatment. When the treated sewage enters the secondary sedimentation tank 14 from the third port 131, the sewage first enters the interior of the secondary sedimentation tank 14 through the liquid guide tube 144. Under the blocking effect of the grille baffle 143, large pieces of suspended matter or floating matter are trapped at the lower end of the grille baffle 143, while the supernatant continues to flow upward. As the water flow gradually slows down, the suspended matter gradually settles at the bottom of the conical sedimentation hopper 142 under the action of gravity, forming a sludge layer. At the same time, the supernatant is stably discharged through the outlet at the top of the secondary sedimentation tank 14, entering the subsequent treatment unit or being recycled. In terms of sludge treatment, when the sludge layer accumulates to a certain thickness, the sludge can be discharged and collected by opening the sludge discharge valve at the bottom of the sedimentation hopper. The discharged sludge can be further dehydrated, dried, etc. to achieve resource recycling and reduce environmental pollution.

[0036] Specifically, in order to facilitate the treatment of the sludge in the secondary sedimentation tank 14: the dual sludge return system 4 includes a sludge return pump 41 arranged inside the secondary sedimentation tank 14 and connected to the inside of the conical sedimentation hopper 142, and a first sludge return pipe 42 fixedly plugged on the box body 1 and connected to the sludge return pump 41, the end of the first sludge return pipe 42 extends to the inside of the anaerobic tank 11, and a second solenoid valve 421 is fixedly installed on the first sludge return pipe 42. The dual sludge return system 4 also includes a second sludge return pipe 43 fixedly arranged on the first sludge return pipe 42 corresponding to the sludge return pump 41 and the second solenoid valve 421, the end of the second sludge return pipe 43 is fixedly plugged on the box body 1 and extends to the inside of the anoxic tank 13, and a third solenoid valve 431 is fixedly installed on the second sludge return pipe 43. A sludge discharge pipe 6 is fixedly arranged on the first sludge return pipe 42, corresponding to the sludge return pump 41 and the second solenoid valve 421, and a fourth solenoid valve 61 is fixedly installed on the sludge discharge pipe 6. Through the flexible adjustment of the dual sludge return system 4, the sludge return path can be optimized according to different water quality and treatment requirements, and the efficiency and effect of biological treatment can be improved. At the same time, it is convenient to discharge the sludge in the conical sedimentation hopper 142. When it is necessary to return sludge to the anaerobic tank 11, the second solenoid valve 421 is opened, the third solenoid valve 431 and the fourth solenoid valve 61 are closed, and the sludge return pump 41 transports the sludge in the secondary sedimentation tank 14 to the anaerobic tank 11 through the first sludge return pipe 42. When it is necessary to return sludge to the anoxic tank 13, the third solenoid valve 431 is opened, the second solenoid valve 421 and the fourth solenoid valve 61 are closed, and the sludge enters the anoxic tank 13 through the second sludge return pipe 43. During the sludge return process, if it is necessary to discharge excess sludge or clean the equipment, the fourth solenoid valve 61 can be opened to discharge the sludge from the equipment through the sludge discharge pipe 6. By adjusting the opening and closing states of the second solenoid valve 421 and the third solenoid valve 431, a single return or double return mode of sludge between the anaerobic tank 11 and the anoxic tank 13 can be achieved to adapt to different water qualities and treatment requirements.

[0037] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical solution and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. An AOA assembled sewage treatment equipment with adjustable single and double reflows, comprising a housing (1), wherein an anaerobic tank (11), an aerobic tank (12), an anoxic tank (13), a secondary sedimentation tank (14) and a disinfection tank (15) are arranged inside the housing (1) along the sewage flow direction, wherein a stirring structure (2) is arranged inside the anaerobic tank (11), an aeration system (3) is arranged inside the aerobic tank (12), and an intermittent gas stirring mechanism (7) is arranged inside the anoxic tank (13); A dual sludge return system (4) is also provided inside the box (1); Features: The stirring structure (2) comprises a driven rotating rod (21) rotatably arranged at the bottom of the anaerobic tank (11), a fixed sleeve (22) symmetrically fixedly sleeved on the driven rotating rod (21), a plurality of stirring rods (23) fixedly connected to the fixed sleeve (22) in an annular array, a stirring plate (24) fixedly connected to the end of the stirring rod (23), and a driving mechanism (25) for driving the stirring rod (23) to rotate; The driving mechanism (25) comprises a driving rotating rod (251) rotatably arranged at the top of the anaerobic tank (11), a mounting seat (252) fixedly mounted on the driving rotating rod (251), a plurality of supporting rods (253) fixedly connected to the mounting seat (252) in an annular array, a conical bowl (254) fixedly connected to the end of the supporting rod (253), a synchronous gear (255) fixedly mounted on the driving rotating rod (251) and the driven rotating rod (21), and a synchronous belt (256) meshingly mounted on the two synchronous gears (255).

2. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 1 is characterized by: The end of the conical bowl (254) away from the opening is processed into a curved surface.

3. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 1 is characterized by: A water inlet pipe (16) extending into the anaerobic tank (11) is fixedly connected to one end of the housing (1), and a water outlet end of the water inlet pipe (16) corresponds to the top of the conical bowl (254). A first opening (111) is provided at the top between the anaerobic tank (11) and the aerobic tank (12), a second opening (121) is provided at the top between the aerobic tank (12) and the anoxic tank (13), a third opening (131) is provided at the top between the anoxic tank (13) and the secondary sedimentation tank (14), and a fourth opening (141) is provided at the top between the secondary sedimentation tank (14) and the disinfection tank (15). A water outlet pipe (17) extending into the disinfection tank (15) is fixedly connected to the other end of the housing (1).

4. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 3 is characterized by: Filter screens (5) are fixedly arranged inside the first opening (111) and the second opening (121).

5. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 1 is characterized by: The aeration system (3) comprises a pipeline (31) arranged in the aerobic tank (12), a first air guide pipe (32) plugged into the housing (1) and connected to the pipeline (31), a first solenoid valve (33) fixedly mounted on the first air guide pipe (32), and an aerator (34) fixedly mounted on the housing (1) and connected to the first air guide pipe (32).

6. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 1 is characterized by: The intermittent gas stirring mechanism (7) comprises a perforated aeration pipe (71) arranged in the anoxic tank (13), a second air guide pipe (72) plugged into the housing (1) and connected to the perforated aeration pipe (71), and a fifth solenoid valve (73) fixedly mounted on the second air guide pipe (72), wherein one end of the second air guide pipe (72) away from the perforated aeration pipe (71) is connected to the output end of the aerator (34).

7. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 1 is characterized by: A conical sedimentation hopper (142) is arranged at the bottom of the secondary sedimentation tank (14), and a grille baffle (143) is arranged at the top of the secondary sedimentation tank (14). A liquid guide tube (144) extending to the top of the port of the conical sedimentation hopper (142) is inserted on the grille baffle (143), and the inlet end of the liquid guide tube (144) is connected to the third opening (131).

8. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 1 is characterized by: The dual sludge return system (4) comprises a sludge return pump (41) arranged inside the secondary sedimentation tank (14) and connected to the inside of the conical sedimentation hopper (142), and a first sludge return pipe (42) fixedly plugged into the housing (1) and connected to the sludge return pump (41), the end of the first sludge return pipe (42) extending to the inside of the anaerobic tank (11), and a second solenoid valve (421) fixedly mounted on the first sludge return pipe (42).

9. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 8 is characterized by: The dual sludge return system (4) further comprises a second sludge return pipe (43) fixedly arranged on the first sludge return pipe (42) between the sludge return pump (41) and the second solenoid valve (421), wherein the end of the second sludge return pipe (43) is fixedly plugged into the housing (1) and extends to the interior of the anoxic tank (13), and a third solenoid valve (431) is fixedly mounted on the second sludge return pipe (43).

10. The AOA assembled sewage treatment equipment with adjustable single and double reflux according to claim 8 is characterized by: A mud discharge pipe (6) is fixedly arranged on the first mud return pipe (42) and communicates with the corresponding mud return pump (41) and the second solenoid valve (421), and a fourth solenoid valve (61) is fixedly installed on the mud discharge pipe (6).

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