Circulating intermittent aeration type sewage treatment device

Abstract

The utility model discloses a circulating intermittent aeration type sewage treatment device which comprises a reaction tank, two arc-shaped partition plates are arranged in the reaction tank and sequentially divide the reaction tank into an anaerobic zone, an anoxic zone and an aerobic zone, and the concave surfaces of the arc-shaped partition plates face the aerobic zone; the aeration system is arranged in the aerobic zone of the reaction tank; the stirring systems are respectively arranged in the anaerobic zone and the anoxic zone of the reaction tank; the control system is electrically connected with the aeration system and the stirring system; wherein the bottom of the reaction tank is provided with an inclined slope, and the slope is gradually increased from the anaerobic zone to the aerobic zone. According to the scheme, the tank body is divided into the anaerobic zone, the anoxic zone and the aerobic zone through the two arc-shaped partition plates, so that different environmental conditions required by biological nitrogen and phosphorus removal are realized. Meanwhile, the water flow direction is optimized, dead angles are reduced, and the residence time uniformity of sewage in each area is improved. And operation parameters can be dynamically adjusted according to real-time monitoring data, so that the processing efficiency and the energy utilization rate are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to sewage treatment tank construction technical field, especially to a kind of cyclic intermittent aeration sewage treatment device. BACKGROUND

[0002] High-efficiency flocculation sedimentation tank has become one of the important technologies for sewage treatment by optimizing the reaction and sedimentation process. In particular, the design of the inclined pipe sedimentation zone can significantly reduce the land occupation and civil investment of sewage treatment and improve the overall treatment capacity by improving the sedimentation efficiency. However, the current inclined pipe sedimentation process still has room for further improvement in the sedimentation efficiency of alum flowers. Research and optimization of the alum flower sedimentation efficiency of the inclined pipe sedimentation zone not only can reduce the use of reagents, improve the treatment effect, but also help to reduce the enterprise.

[0003] For example, patent application No. CN201711194577.0 discloses an intermittent aeration sewage treatment device, which comprises an anaerobic reaction tank, a sedimentation tank and an aerobic tank arranged in sequence. The anaerobic reaction tank is divided into multiple anaerobic reaction zones by a group of baffles and partitions. A plurality of membrane bioreactors are arranged in the anaerobic reaction tank. An aeration pipe is arranged below the membrane bioreactors, and a plurality of aeration holes are arranged on the aeration pipe. A valve for preventing gas from entering is arranged at the inlet of the aeration pipe. The valve and the aeration pipe are connected by a rotating shaft. A torsional spring is arranged on the rotating shaft. The torsional spring generates a restoring force on the valve when the valve is away from the closed position.

[0004] The device structure in the above scheme is simple, and automatic aeration is performed every certain time. However, there is still a problem of insufficient sewage treatment efficiency, so the scheme needs to be optimized. Content of the utility model

[0005] In view of the efficiency and energy consumption problems in the traditional sewage treatment process, the present scheme optimizes the water flow direction, reduces the dead angle, improves the uniformity of the residence time of sewage in each region, and the inclined slope promotes the natural flow of sludge, reduces the deposition, and the accurately controlled aeration and stirring system ensures the dissolved oxygen level and mixing effect in each region.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The application discloses a circulating intermittent aeration type sewage treatment device, which comprises a reaction tank, two arc-shaped partitions are arranged in the reaction tank, and the reaction tank is sequentially divided into an anaerobic zone, an anoxic zone and an aerobic zone by the two arc-shaped partitions; the concave surfaces of the arc-shaped partitions are all directed to the aerobic zone; an aeration system is arranged in the aerobic zone of the reaction tank; a stirring system is arranged in the anaerobic zone and the anoxic zone of the reaction tank respectively; a control system is electrically connected with the aeration system and the stirring system; and the bottom of the reaction tank is provided with an inclined slope, and the slope gradually increases from the anaerobic zone to the aerobic zone.

[0008] In the sewage treatment device, the circulating intermittent aeration process is adopted, the tank body is divided into the anaerobic zone, the anoxic zone and the aerobic zone by the two arc-shaped partitions, and different environmental conditions required by biological nitrogen and phosphorus removal are realized. The concave surfaces of the arc-shaped partitions are directed to the aerobic zone, the water flow direction can be optimized, the dead angle can be reduced, the circulation in the aerobic zone is promoted, and the uniformity of the residence time of sewage in each zone is improved. The slope of the inclined slope at the bottom of the reaction tank gradually increases from the anaerobic zone to the aerobic zone, which is helpful to the natural flow of sludge and the reduction of deposition. The aeration system and the stirring system are arranged in the corresponding zones respectively, so that the dissolved oxygen level and the mixing effect in each zone meet the process requirements. The control system realizes accurate regulation and control of aeration and stirring through electrical connection, can dynamically adjust the operation parameters according to real-time monitoring data, and improves the treatment efficiency and energy utilization rate. The integrated structure not only simplifies the process flow, but also significantly improves the efficiency and stability of sewage treatment by optimizing the hydraulic conditions and reaction environment. Compared with the traditional A / O process, the nitrogen and phosphorus removal efficiency can be increased by 15-20%, and the energy consumption can be reduced by 10-15%.

[0009] Preferably, the aeration system comprises a plurality of microporous aerators which are uniformly distributed in a spiral shape at the bottom of the aerobic zone; a gas supply pipeline which is in communication with the microporous aerators and is distributed in a tree structure; and a variable frequency air compressor which is connected with the main stem of the gas supply pipeline.

[0010] Further, the aeration system further comprises a multi-stage aeration intensity adjusting valve which is installed on the main stem of the gas supply pipeline.

[0011] A gas flow distributor is connected to the outlet end of the multi-stage aeration intensity adjusting valve; and a plurality of subdivided gas pipes are connected with the gas flow distributor, and each subdivided gas pipe is connected with a group of microporous aerators.

[0012] Preferably, the stirring system comprises a double-screw propeller stirrer which is installed in the anaerobic zone, the double-screw propeller stirrer has double-screw propellers with opposite rotation directions; an anti-winding driving shaft which is connected with the double-screw propeller stirrer; a variable frequency driving motor which is connected with the anti-winding driving shaft; and a flexible protective layer which is arranged at the edge of the blade of the double-screw propeller stirrer.

[0013] As preferred, it further comprises: a water inlet device arranged at one end of the anaerobic zone of the reaction tank, including a water inlet pipe and a porous distribution plate; a water outlet device arranged at the other end of the aerobic zone of the reaction tank, including a water outlet pipe and an adjustable height overflow weir; a sludge return system including a sludge discharge pipe arranged in the aerobic zone and a sludge return pipe connecting the aerobic zone and the anaerobic zone; and a residue discharge device including a residue discharge pipe arranged on the surface of the reaction tank.

[0014] As preferred, the control system comprises: a central processing unit capable of recording historical data; a solid-state memory connected to the central processing unit; a high-precision timer connected to the central processing unit; and a human-machine interaction panel capable of adjusting and optimizing operating parameters.

[0015] As preferred, it further comprises: a plurality of optical fiber sensors uniformly installed along the depth direction of the reaction tank; a wireless data acquisition module connected to the optical fiber sensors and the control system; and the optical fiber sensors measure the dissolved oxygen content, pH value and temperature in the tank.

[0016] As preferred, it further comprises: a microbial immobilized carrier suspended in the reaction tank, the carrier being a porous ceramic material; and a carrier recovery system including a liftable screen and a carrier cleaning device.

[0017] Therefore, the present application has the following beneficial effects:

[0018] The arc-shaped partition and the inclined slope optimize the water flow direction, promote the exchange of substances in the anaerobic, anoxic and aerobic zones, improve the reaction efficiency, and thus enhance the nitrogen and phosphorus removal effect of the wastewater.

[0019] The combination use of the multi-stage aeration intensity regulating valve and the gas flow distributor realizes precise control of the aeration amount, meets the needs of different wastewater treatment stages, effectively reduces energy consumption and improves the treatment effect.

[0020] The double-helix propeller stirrer cooperates with the anti-winding drive shaft and the flexible protective layer to improve the stirring efficiency, reduce the equipment wear and tear and winding risk, and prolong the service life of the equipment.

[0021] The combination application of the optical fiber sensor and the wireless data acquisition module realizes real-time monitoring of the key parameters in the reaction tank, provides accurate data support for the control system, and optimizes the automatic control of the entire treatment process. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic diagram of the present application.

[0023] Figure 2 is Figure 1 is a sectional view at A-A in figure

[0024] Figure 3 is Figure 1Cross-sectional view at B-B.

[0025] 1. Reactor tank, 2. Arc-shaped partition, 3. Anaerobic zone, 4. Anoxic zone, 5. Aerobic zone, 6. Microporous aerator, 7. Gas supply pipeline, 8. Subdivision gas pipeline, 9. Double helical propeller agitator, 10. Anti-winding drive shaft, 11. Water inlet pipe, 12. Water outlet pipe, 13. Sludge discharge pipe, 14. Sludge return pipe, 15. Slag discharge pipe, 16. Microorganism immobilized carrier, 17. Overflow weir. DETAILED DESCRIPTION

[0026] The application will be further described below in conjunction with the drawings and specific embodiments.

[0027] Example 1

[0028] As Figure 1As shown, the present application's intermittent aeration wastewater treatment device, by two arc-shaped partition 2 will be separated into the pool body anaerobic zone 3, anoxic zone 4 and aerobic zone 5, the concave surface of the arc-shaped partition 2 towards the aerobic zone 5, this structure can optimize the water flow direction, promote the material exchange between the regions. The reaction tank 1 bottom is provided with an inclined slope, the slope increases gradually from the anaerobic zone 3 to the aerobic zone 5, which helps the natural flow and sedimentation of sludge. The aeration system is arranged in the aerobic zone 5, including a spiral-shaped evenly distributed micro-porous aerator 6, a tree-like structure of the gas supply pipeline 7 and a variable frequency air compressor, the gas supply pipeline 7 includes several sub-gas pipes 8. The combination of multi-stage aeration intensity regulating valve and gas flow distributor is used to realize the precise control of aeration amount and meet the needs of different processing stages. The stirring system is arranged in the anaerobic zone 3 and the anoxic zone 4, respectively, wherein the double helical propeller stirrer 9 has opposite rotation directions, cooperates with the anti-winding drive shaft 10 and the flexible protective layer, significantly improves the stirring efficiency, and reduces the equipment wear and tear and winding risk. The control system realizes intelligent control of the whole treatment process through the central processing unit, solid-state memory, high-precision timer and man-machine interaction panel. The reasonable arrangement of the water inlet device, the water outlet device, the sludge return system and the slag discharge device ensures the orderly flow and treatment of wastewater, the water inlet device is arranged at one end of the anaerobic zone of the reaction tank, including a water inlet pipe 11 and a multi-hole distribution plate; the water outlet device is arranged at the other end of the aerobic zone of the reaction tank, including a water outlet pipe 12 and an adjustable height overflow weir 17; the sludge return system includes a sludge discharge pipe 13 arranged in the aerobic zone and a sludge return pipe 14 connecting the aerobic zone and the anaerobic zone; the slag discharge device includes a slag discharge pipe 15 arranged on the surface of the reaction tank. The combination of the optical fiber sensor and the wireless data acquisition module realizes real-time monitoring of the key parameters in the reaction tank 1, and provides accurate data support for the control system. The microbial immobilized carrier 16 is made of porous ceramic material and suspended in the reaction tank 1, which increases the attachment area of microorganisms and improves the biological treatment efficiency. The carrier recovery system is set to facilitate the cleaning and replacement of the carrier. This scheme optimizes the hydraulic conditions, improves the oxygen utilization rate, enhances the microbial activity and accurately controls the operating parameters, realizes efficient nitrogen and phosphorus removal of wastewater, and reduces energy consumption.

[0029] Specifically, as shown in Figure 2 、 3 In this embodiment, two arc-shaped partitions 2 are arranged in the reaction tank 1, which are made of high-strength corrosion-resistant stainless steel with a thickness of about 10 mm and a special surface treatment to enhance corrosion resistance. The radius of curvature is about 1 / 3 of the width of the reaction tank 1, and the concave surface faces the aerobic zone 5. This structure not only optimizes the water flow direction, but also increases the contact area between the water body and the partition, and promotes the material exchange efficiency between the regions.

[0030] The inclined slope at the bottom of the reaction tank 1 is paved with wear-resistant polymer material, and the slope gradually increases from the anaerobic zone 3 to the aerobic zone 5, with an angle gradually increasing from 2° to 10°, thereby realizing the natural flow and sedimentation of sludge, reducing the formation of dead angle areas, and improving the overall treatment efficiency.

[0031] The microporous aerator 6 of the aeration system is made of high-density polyethylene material, with a pore size of about 0.5-1mm, and is uniformly distributed in a spiral shape at the bottom of the aerobic zone 5 with a spacing of about 30cm. This layout ensures uniform distribution of oxygen and improves oxygen utilization. The gas supply pipeline 7 is made of corrosion-resistant PVC material with a wall thickness of 3mm, and is distributed in a tree-like structure, with the main pipe diameter being 50mm, gradually decreasing to 10mm at the end, ensuring uniform distribution of gas.

[0032] The double helical impeller stirrer 9 in the stirring system is made of 304 stainless steel, with a diameter of 1 / 3 of the width of the reaction tank 1, and the distance between the two helical impellers is 1.5 times the diameter of the helical impeller. The helical impellers rotate in opposite directions, and the speed can be adjusted between 20-60rpm, improving stirring efficiency and reducing dead angle areas. The anti-winding drive shaft 10 is made of special alloy material, and the surface is hardened to a hardness of HRC60 or above, effectively preventing the winding of fiber materials.

[0033] The control system uses an industrial-grade PLC with a processor frequency of 1GHz and a built-in 256GB solid state drive for data storage. The high-precision timer has an accuracy of 0.1 seconds, ensuring accurate control of each processing stage. The human-machine interaction panel uses a 10.1-inch high-definition touch screen with a resolution of 1920*1080 and supports multi-point touch operation.

[0034] The optical fiber sensor uses optical-grade quartz material with a diameter of only 125μm, and is installed every 50cm along the depth direction of the reaction tank 1, which can simultaneously measure the dissolved oxygen content (accuracy ±0.1mg / L), pH value (accuracy ±0.01) and temperature (accuracy ±0.1℃). This high-precision real-time monitoring provides accurate data support for the control system, allowing the entire treatment process to be dynamically adjusted according to actual conditions.

[0035] The microbial immobilization carrier 16 is made of porous ceramic material with a porosity of 60% and a specific surface area greater than 500m² / g, suspended in the reaction tank 1. This high specific surface area carrier significantly increases the attachment area of microorganisms, improving the biological treatment efficiency. The liftable screen of the carrier recovery system is made of 316L stainless steel with a mesh size of 1mm*1mm, which can effectively recover the carrier without affecting the flow of wastewater.

[0036] The device realizes efficient sewage denitrification and phosphorus removal. According to the preliminary experimental data, when treating conventional municipal sewage, the ammonia nitrogen removal rate of the device can reach more than 95%, the total phosphorus removal rate is more than 90%, and the energy consumption is reduced by about 20% compared with the traditional process. This excellent performance is mainly due to the optimized hydraulic conditions, improved oxygen utilization, enhanced microbial activity and precise process control.

[0037] In this embodiment, the implementation process of the cyclic intermittent aeration sewage treatment device can be divided into three main stages: installation, debugging and operation.

[0038] In the installation stage, first of all, the reaction tank 1 needs to be accurately constructed according to the design drawings, and the installation position and angle of the two arc-shaped partitions 2 need to be ensured to meet the requirements. The installation error of the partition should be controlled within ±5mm to ensure that the volume ratio of the anaerobic zone 3, the anoxic zone 4 and the aerobic zone 5 is 1:1.5:2. The laying of the inclined slope at the bottom needs special attention, and the slope should gradually transition from 2° in the anaerobic zone 3 to 10° in the aerobic zone 5, and the transition curve should be a quadratic curve to ensure smooth transition.

[0039] In the installation of the aeration system, the microporous aerator 6 needs to be installed in a spiral layout, and the distance between each aerator should be controlled within 30±1cm. When installing the tree-like structure of the gas supply pipeline 7, the connection angle between the main pipe and each level of branch pipe should be between 45°-60° to reduce air resistance. After the pipeline installation is completed, a 24-hour air tightness test needs to be conducted to ensure that the system has no leakage. The distance between the two propellers in the stirring system should be accurately controlled at 1.5±0.05 times the diameter of the propeller to achieve the best stirring effect. The installation of the anti-winding drive shaft 10 needs to use a special bearing to ensure that the gap between the bearing and the shaft is not more than 0.1mm to prevent small fibers from entering.

[0040] In the debugging stage, first of all, single machine test is carried out to ensure that each component can work normally. The debugging of the aeration system needs to gradually increase the gas pressure from 0.05MPa, and each time increase by 0.05MPa until the design pressure of 0.3MPa is reached. In this process, it is necessary to check whether the air outlet of each microporous aerator 6 is uniform. The debugging of the stirring system needs to be carried out under two conditions of no load and load. When there is no load, gradually increase the speed from 10rpm to 60rpm, and run for 5 minutes at each speed to observe the vibration and noise. When there is a load, use simulated sewage for testing, adjust the relative angle of the double propellers until the best stirring effect is achieved. The debugging of the control system needs to simulate various working conditions, including normal operation, equipment failure, abnormal water quality, etc., to ensure that the system can respond correctly. The calibration of the optical fiber sensor needs to be carried out using standard solutions to ensure that the measurement accuracy meets the design requirements.

[0041] In the running phase, the system first enters the start-up period. This stage requires gradually increasing the water inflow, starting from 30% of the designed treatment capacity, increasing by 10% per day until reaching full load. During this process, close monitoring of the dissolved oxygen, pH value, and temperature changes in each area is required, and timely adjustment of the aeration amount and stirring intensity is necessary. After the system reaches stable operation, dynamic adjustment of the operating parameters is required according to changes in the water quality. For example, when the ammonia nitrogen concentration in the inflow suddenly increases, the system will automatically increase the aeration time and intensity of the aerobic zone 5. If the organic matter concentration in the inflow decreases, the system will correspondingly reduce the stirring time in the anaerobic zone 3. These adjustments are automatically completed based on real-time monitoring data and pre-set optimization algorithms.

[0042] In practical applications, the following points need special attention: First, the dosage of the microbial immobilized carrier 16 needs to be optimized according to the actual characteristics of the wastewater, generally with an initial dosage of 10-15% of the volume of the reaction tank 1, and then gradually adjusted according to the treatment effect. Second, when operating in winter, insulation measures may need to be added to ensure that microbial activity is not affected by low temperatures. Third, when treating wastewater with high nitrogen and phosphorus ratios, additional carbon sources may be needed, such as using easily degradable organic matter such as sodium acetate, with the addition amount dynamically adjusted according to the C / N ratio of the inflow.

[0043] In addition, it is worth noting that the skilled person in the art can install a movable sunshade on the top of the reaction tank 1 to reduce water temperature and reduce microbial activity and ammonia nitrogen emission during high summer temperatures. In addition, a small pre-treatment unit can also be added to remove suspended solids and oil from the wastewater, which will help to extend the dredging cycle of the main reaction tank 1 and improve the overall operating efficiency.

[0044] In practical production applications, the system has been tested in a municipal wastewater treatment plant for a period of 6 months. The results show that when treating 10000 tons of municipal wastewater per day, the effluent water quality stably reaches the first level A standard, with an average COD removal rate of 95%, an ammonia nitrogen removal rate of 98%, and a total phosphorus removal rate of 93%. At the same time, compared with the traditional activated sludge method, energy consumption is reduced by about 22%, and sludge production is reduced by about 15%. These data fully demonstrate the superiority and reliability of the scheme in practical applications.

[0045] Example 2

[0046] Compared to Example 1, this embodiment proposes an improved circulating intermittent aeration wastewater treatment device, employing a double-layer reaction tank design 1, combined with an optimized aeration and stirring system to improve nitrogen and phosphorus removal efficiency. The device consists of two reaction tanks 1, each 6 meters long, 3 meters wide, and 2 meters high, with a total effective volume of approximately 72 cubic meters. The upper reaction tank 1 uses a traditional A / O process, while the lower reaction tank 1 employs an innovative intermittent aeration process. The two reaction tanks 1 are connected by a central vertical shaft with a diameter of 0.5 meters, containing a built-in lift pump for wastewater circulation.

[0047] The upper reaction tank 1 is equipped with a movable partition that divides the tank into an anaerobic zone 3 and an aerobic zone 5. The partition is made of corrosion-resistant, high-strength composite material, 3 cm thick, 1.8 m high, and 2.9 m wide, and is fitted with pulleys at the bottom for sliding along the tank wall. By adjusting the partition's position, operators can flexibly change the volume ratio of the anaerobic zone 3 and the aerobic zone 5 to adapt to different water quality conditions. Rubber sealing strips are installed on both sides of the partition to ensure effective isolation between the two zones.

[0048] The aeration system in the upper reaction tank 1 uses diaphragm-type microporous aerators 6, with a diameter of 20 cm and an pore size of 0.5-1 mm. The aerators are evenly arranged in a quincunx pattern at the bottom of the aerobic zone 5, with a spacing of 50 cm. The air supply system consists of a variable frequency air compressor and intelligent control valves, which can adjust the aeration rate in real time according to the dissolved oxygen concentration. The mixing system uses a low-speed large impeller mixer with an impeller diameter of 1.5 meters and a rotation speed adjustable within the range of 20-60 rpm. The mixer is installed in the center of the anaerobic zone 3 to ensure thorough mixing.

[0049] The lower reaction tank 1 employs an intermittent aeration process, with a retractable array of aeration discs installed at the bottom. Each aeration disc is 30 cm in diameter, made of porous ceramic material with pore sizes of 0.1-0.3 mm. The aeration discs are connected via a pneumatic lifting system, allowing them to move vertically 10-50 cm. This design allows the aeration discs to be raised above the water surface during non-aeration phases, preventing microbial adhesion and clogging, and extending equipment lifespan. The lower reaction tank 1 is also equipped with a horizontally mounted propeller agitator, 1 meter in diameter, with an adjustable speed range of 10-40 rpm, ensuring thorough mixing during non-aeration phases.

[0050] The control system employs a combination of PLC and SCADA to achieve fully automated operation. By monitoring parameters such as dissolved oxygen (DO), oxidation-reduction potential (ORP), pH, and ammonia nitrogen concentration in real time, the system dynamically adjusts aeration time, aeration intensity, stirring speed, and internal circulation flow rate. The control strategy is based on a fuzzy logic algorithm, which can adaptively adjust operating parameters according to influent water quality and treatment effect. For example, when the ammonia nitrogen concentration is detected to be higher than the threshold, the system will extend the aerobic phase time and increase the aeration intensity; when the total nitrogen removal effect is poor, the system will increase the internal circulation flow rate to enhance the denitrification process.

[0051] The sludge return system is controlled by a variable frequency pump, and the return ratio can be adjusted within the range of 50%-150%. The start and stop of the return pump and its speed are automatically controlled by the PLC according to the influent load and treatment effect. In addition, the system is also equipped with an intelligent sludge discharge device, which automatically controls the discharge amount of excess sludge by real-time monitoring of the mixed liquor suspended solids (MLSS) concentration, to maintain the optimal sludge concentration and sludge age.

[0052] The core technical point of the present embodiment is the design of the double-layer reaction tank 1 and the coordinated control of intermittent aeration and stirring. The upper reaction tank 1 ensures the basic nitrogen and phosphorus removal effect, while the lower reaction tank 1 creates a microenvironment conducive to simultaneous nitrification and denitrification through precise intermittent aeration, improving the total nitrogen removal efficiency. Theoretical calculations show that when treating medium-concentration municipal wastewater (COD 300 mg / L, TN 40 mg / L, TP 4 mg / L), the present system can achieve a COD removal rate of more than 95%, a total nitrogen removal rate of more than 85%, and a total phosphorus removal rate of more than 90%. At the same time, due to the optimization of the aeration strategy, the energy consumption is expected to be reduced by about 20% compared to the traditional A / O process. This improved cyclic intermittent aeration wastewater treatment device, through structural optimization and intelligent control, significantly improves the nitrogen and phosphorus removal efficiency and energy utilization rate while maintaining the simplicity and ease of operation of the process.

Claims

1. A circulating intermittent aeration type wastewater treatment device, characterized in that, It comprises: a reaction tank, which is divided into an anaerobic zone, an anoxic zone and an aerobic zone by two arc-shaped partitions in sequence, the concave surfaces of the arc-shaped partitions face the aerobic zone, an aeration system arranged in the aerobic zone of the reaction tank, a stirring system arranged in the anaerobic zone and the anoxic zone of the reaction tank respectively, and a control system electrically connected with the aeration system and the stirring system, wherein the bottom of the reaction tank is provided with an inclined slope, and the slope gradually increases from the anaerobic zone to the aerobic zone.

2. The sewage treatment device according to claim 1, characterized in that, The aeration system comprises: a plurality of microporous aerators uniformly distributed in a spiral shape at the bottom of the aerobic zone; a gas supply pipeline in communication with the microporous aerators, the gas supply pipeline is distributed in a tree structure; and a variable frequency air compressor connected with the main stem of the gas supply pipeline.

3. The sewage treatment device according to claim 2, characterized in that The aeration system further comprises a multi-stage aeration intensity adjusting valve installed on the main stem of the gas supply pipeline; a gas flow distributor connected to the outlet end of the multi-stage aeration intensity adjusting valve; a plurality of sub-gas pipes connected with the gas flow distributor, each sub-gas pipe is connected with a group of microporous aerators.

4. The sewage treatment device of claim 1, wherein The stirring system comprises: a double-screw propeller stirrer installed in the anaerobic zone, the double-screw propeller stirrer has double-screw propellers with opposite rotation directions; an anti-winding drive shaft connected with the double-screw propeller stirrer; a variable frequency drive motor connected with the anti-winding drive shaft; and a flexible protective layer provided at the edge of the blade of the double-screw propeller stirrer.

5. The sewage treatment device according to any one of claims 1 to 4, characterized in that It further comprises: a water inlet device arranged at one end of the anaerobic zone of the reaction tank, comprising a water inlet pipe and a porous flow divider; a water outlet device arranged at the other end of the aerobic zone of the reaction tank, comprising a water outlet pipe and an adjustable height overflow weir; a sludge return system comprising a sludge discharge pipe arranged in the aerobic zone and a sludge return pipe connecting the aerobic zone and the anaerobic zone; and a slag discharge device comprising a slag discharge pipe arranged on the surface of the reaction tank.

6. The sewage treatment device according to any one of claims 1 to 4, wherein The control system comprises: a central processing unit capable of recording historical data; a solid-state memory connected with the central processing unit; a high-precision timer connected with the central processing unit; and a man-machine interaction panel capable of adjusting and optimizing operating parameters.

7. The sewage treatment device of claim 1, wherein It further comprises: a plurality of optical fiber sensors uniformly installed along the depth direction of the reaction tank; and a wireless data acquisition module connected with the optical fiber sensors and the control system, wherein the optical fiber sensors measure the dissolved oxygen content, pH value and temperature in the tank.

8. The sewage treatment device of claim 1, wherein It further comprises: a microbial immobilized carrier suspended in the reaction tank, wherein the carrier is a porous ceramic material; a carrier recovery system comprising a liftable screen and a carrier cleaning device.

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