Aerobic circulating self-coupling disposal FAAO sewage treatment reactor

Abstract

The application discloses a kind of pneumatic circulation self-coupling deployment FAAO sewage treatment reactor, including facultative reaction zone, anaerobic reaction zone, anoxic circulating reaction zone, self-coupling deployment reaction zone, aerobic reaction zone, sedimentation separation clarification zone and equipment operation maintenance area etc., each functional area is arranged in space and constitutes the unique S-shaped structure of the present application.The mass transfer effect of activated sludge in the reactor and the treatment efficiency are enhanced by the innovative design of the sewage treatment reactor, and the low-carbon treatment of sewage is realized from the principle and application.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a pneumatically circulated self-coupling FAAO wastewater treatment reactor. Background Technology

[0002] The treatment of decentralized, small-scale wastewater from rural areas, small towns, tourist attractions, service areas, resorts, hotels, schools, and other point-source wastewater from ditches, rivers, lakes, and reservoirs is becoming increasingly stringent and standardized, and the comprehensive management of the ecological natural water cycle is receiving growing attention. To address the challenges of treating this type of wastewater, this invention proposes an intelligent, modular integrated reactor system that offers advantages such as reduced investment and construction costs, convenient installation, stable and economical operation, easy maintenance and management, simple equipment operation, and optimized process performance. Furthermore, it offers greater savings throughout the equipment's entire lifespan.

[0003] Currently, most conventional AAO process equipment designs are traditional, equipping them with numerous pumps, mixers, and fans, resulting in high installed power, high energy consumption, and frequent operational failures. While some innovative designs use pneumatic agitation instead of mechanical agitation to reduce energy consumption, most pneumatic agitation designs suffer from difficulties in controlling the agitation effect. The functional zoning of conventional AAO process equipment is mostly segmented in structure, which does not fully utilize the effective space. Some innovative designs have also optimized the internal structure of the equipment, but most structural designs still suffer from insufficient space utilization.

[0004] Conventional AAO (Automatic Aeration and Respiration) process equipment is generally not highly targeted in addressing the treatment of decentralized, small-scale sewage from rural areas, small towns, tourist attractions, various service areas, leisure resorts, hotels, schools, and point-source sewage from ditches, ponds, rivers, lakes, and reservoirs. In terms of water quality characteristics, this type of sewage shares certain similarities in terms of quantity and quality. However, influenced by seasonal changes, population movement, dietary habits, and cultural customs, the quantity and quality of this type of sewage fluctuate significantly, with substantial daily variations across different regions. Wastewater treatment projects are challenging to design and construct, particularly the construction of sewage collection networks, which involves large investments, wide-ranging implementation, and numerous problems. Furthermore, in some areas, limitations in personnel and economic conditions make the operation and maintenance of such sewage treatment facilities extremely difficult, and generally beyond the capabilities of ordinary personnel.

[0005] Currently, many rural areas, small towns, and other residential areas still lack wastewater treatment facilities. Small-scale point-source sewage remains prevalent, and the treatment of water pollution sources such as ditches, ponds, rivers, and reservoirs has not eliminated pollution at its source. The treatment capacity for decentralized wastewater from villages and towns, as well as small-scale point-source sewage and wastewater from ditches, ponds, rivers, and reservoirs, remains insufficient. This type of wastewater is discharged into nearby water bodies without treatment, causing pollution to local water environments and groundwater.

[0006] Therefore, how to provide a pneumatically circulated self-coupling FAAO wastewater treatment reactor is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] One objective of this invention is to propose a pneumatically circulated self-coupling FAAO wastewater treatment reactor. Through innovative design of the wastewater treatment reactor, this invention enhances the mass transfer effect and treatment efficiency of activated sludge within the reactor, achieving low-carbon wastewater treatment in both principle and application.

[0008] According to an embodiment of the present invention, a pneumatically circulated self-coupling FAAO wastewater treatment reactor includes an anoxic reaction zone, an anaerobic reaction zone, an anoxic circulation reaction zone, a self-coupling reaction zone, an aerobic reaction zone, a sedimentation separation and clarification zone, and an equipment operation and maintenance zone, etc., and the spatial arrangement of each functional zone forms a unique S-shaped structure.

[0009] The reactor, viewed from the bottom up, is divided into three corridors. The first corridor, from left to right, consists of the facultative anaerobic reaction zone, the anaerobic reaction zone, and a section of the anoxic reaction zone. The second corridor, from right to left, consists of two sections of the anoxic reaction zone, the self-coupling and blending reaction zone, and a section of the aerobic reaction zone. The third corridor, from left to right, consists of two sections of the aerobic reaction zone and the precipitation separation and clarification zone.

[0010] The equipment operation and maintenance area is located on the far right of the reactor.

[0011] The reactor's S-shaped structure includes a large S-shaped circulation structure and a small S-shaped guide vane structure. The large S-shaped circulation structure is composed of three corridors arranged in parallel and connected end to end. The small S-shaped guide vane structure is composed of guide vanes installed inside the large S-shaped circulation structure. The large S-shaped circulation structure and the small S-shaped guide vane structure together form the reactor's S-shaped strong mixing circulation flow structure configuration.

[0012] The anaerobic reaction zone of the reactor is the inlet end, and the anaerobic reaction zone is located to its right.

[0013] The anoxic cycle reaction zone consists of an anoxic reaction zone section one and an anoxic reaction zone section two, supplemented by the pneumatic circulation control system. The guide vanes, the pulse gas-liquid disturbance system, and the pneumatic reflux control system are all arranged in the facultative anaerobic reaction zone, the anaerobic reaction zone, and the anoxic cycle reaction zone. With their structural form, the activated sludge mixed liquor in the zone can fully transfer mass, be strongly mixed, and circulate, so as to achieve the purpose of high-efficiency reaction.

[0014] The self-coupling reaction zone is located on the left side of the second section of the anoxic reaction zone, and the microporous air diffusion system and the pulsed gas-liquid disturbance system are arranged therein.

[0015] The aerobic reaction zone is divided into an aerobic reaction zone section one and an aerobic reaction zone section two, both of which are equipped with the microporous air diffusion system.

[0016] The sedimentation separation and clarification zone is located on the right side of the second section of the aerobic reaction zone. It is divided into the sedimentation separation zone of the activated sludge mixture and the coagulation clarification zone. The sedimentation separation zone is used for primary sedimentation separation of the activated sludge mixture and return of activated sludge. The supernatant after separation enters the coagulation clarification zone for secondary sedimentation and clarification. The sludge clarified in the secondary stage is discharged as excess sludge. The sedimentation separation and clarification zone is designed for two-stage treatment.

[0017] The equipment operation and maintenance area includes flow meters, electric valves, aeration blowers, valve group gas supply and distribution systems, automatic dosing systems, and intelligent control systems. As an integrated area for the assembly of reactor supporting equipment, the equipment operation and maintenance area is convenient for operation and maintenance.

[0018] Furthermore, the pulsed gas-liquid disturbance system includes a pulsed air diffuser, a pulsed air pipeline, and a pulsed air control valve. By controlling the opening and closing time period of the control valve, power air is intermittently injected into the pulsed air diffuser, and pulsed air is released instantaneously, thereby promoting the mixing and flow of activated sludge mixed liquor.

[0019] Furthermore, the pneumatic reflux control system includes a power air control valve, an air supply pipeline, a drainage pipeline, and an air-lifting pipeline. By controlling the opening and closing time period of the control valve, power air is intermittently blown into the air-lifting pipeline, and the density difference of the activated sludge mixed liquor is used for lifting and drainage.

[0020] Furthermore, the pneumatic circulation control system includes a pneumatic internal circulation system for the anoxic reaction zone and a pneumatic internal circulation system for the aerobic reaction zone. The pneumatic internal circulation system for the anoxic reaction zone consists of a first stage of the anoxic reaction zone, a second stage of the anoxic reaction zone, and a pneumatic reflux control system. The pneumatic internal circulation system for the aerobic reaction zone consists of a sedimentation separation zone, a first stage of the aerobic reaction zone, and a pneumatic reflux control system.

[0021] Furthermore, the self-coupling reaction zone includes a microporous air diffusion system and a pulsed gas-liquid disturbance system. This reaction zone can be self-coupled according to the actual water quality conditions, and the mixing control valve is used for mixing control. When the nitrogen content of the influent is high, the zone can be controlled to be in an anoxic state.

[0022] Furthermore, the valve group air supply and distribution system includes a solenoid valve group, a controller, a pressure balancing cylinder, and a blower, etc.

[0023] Furthermore, the intelligent control system can generate reactor operation reports, monitor operating conditions, and adjust process operating parameters, and can achieve automatic operation.

[0024] Furthermore, the microporous air diffusion system includes an air supply pipeline, valves, and a microporous air diffuser, which works in conjunction with the valve group air supply and distribution system to achieve oxygen supply control and dissolved oxygen stability in the aerobic reaction zone.

[0025] Furthermore, it also includes the reactor system and process operation cycle design, in which the activated sludge concentration in the reactor can be controlled at 3000mg / L to 7000mg / L. The activated sludge concentration is controlled at a high level, the system has good shock resistance, and the treatment effect is stable.

[0026] Furthermore, it also includes the integrated equipment design of the reactor, with an appearance suitable for transportation conditions such as highways and railways.

[0027] The beneficial effects of this invention are:

[0028] This invention enhances the mass transfer effect and treatment efficiency of activated sludge in the wastewater treatment reactor through innovative design, achieving low-carbon wastewater treatment in principle and application. It is particularly suitable for decentralized small-scale wastewater treatment in rural areas, small towns, tourist attractions, various service areas, leisure resorts, hotels, schools, and other water environment point source wastewater treatment such as ditches, ponds, rivers, lakes and reservoirs. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is a three-dimensional schematic diagram of a pneumatically circulated self-coupling FAAO wastewater treatment reactor proposed in this invention.

[0031] Figure 2 This is a plan view of a pneumatically circulated self-coupling FAAO wastewater treatment reactor proposed in this invention. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0033] Please refer to Figure 1 and Figure 2 This invention provides a pneumatically circulated self-coupling FAAO wastewater treatment reactor, including an anaerobic reaction zone, an anaerobic reaction zone, an anoxic circulation reaction zone, a self-coupling reaction zone, an aerobic reaction zone, a sedimentation separation and clarification zone, and an equipment operation and maintenance zone, etc. The functional zones are arranged in a unique S-shaped structure in space.

[0034] The reactor, viewed from above, is divided into three corridors from bottom to top. The first corridor, from left to right, consists of an anaerobic reaction zone, an anaerobic reaction zone, and a section of an anoxic reaction zone. The second corridor, from right to left, consists of two sections of an anoxic reaction zone, a self-coupling reaction zone, and a section of an aerobic reaction zone. The third corridor, from left to right, consists of two sections of an aerobic reaction zone and a precipitation separation and clarification zone.

[0035] The equipment operation and maintenance area is located on the far right of the reactor.

[0036] The reactor's S-shaped structure includes a large S-shaped circulation structure and a small S-shaped guide vane structure. The large S-shaped circulation structure consists of three channels arranged in parallel and connected end to end. The small S-shaped guide vane structure is formed by guide vanes installed inside the large S-shaped circulation structure. The large S-shaped circulation structure and the small S-shaped guide vane structure together form the reactor's S-shaped strong mixing circulation flow structure configuration.

[0037] The anaerobic reaction zone of the reactor is located at the inlet end, and the anaerobic reaction zone is located to its right.

[0038] The anoxic cycle reaction zone consists of an anoxic reaction zone section one and an anoxic reaction zone section two, supplemented by a pneumatic circulation control system. The facultative anaerobic reaction zone, anaerobic reaction zone and anoxic cycle reaction zone are all equipped with guide vanes, pulse gas-liquid disturbance systems and pneumatic reflux control systems. Combined with its structural form, the activated sludge mixed liquor in the zone can fully transfer mass, mix strongly and circulate, so as to achieve the purpose of high-efficiency reaction.

[0039] The self-coupling reaction zone is located on the left side of the second section of the anoxic reaction zone, and it is equipped with a microporous air diffusion system and a pulsed gas-liquid disturbance system.

[0040] The aerobic reaction zone is divided into aerobic reaction zone section one and aerobic reaction zone section two, both of which are equipped with microporous air diffusion systems.

[0041] The sedimentation separation and clarification zone is located on the right side of the second section of the aerobic reaction zone. It is divided into an activated sludge mixed liquor sedimentation separation zone and a coagulation clarification zone. The sedimentation separation zone is used for primary sedimentation separation of activated sludge mixed liquor and return of activated sludge. The supernatant after separation enters the coagulation clarification zone for secondary sedimentation and clarification. The sludge from the secondary clarification is discharged as excess sludge. The sedimentation separation and clarification zone is designed for secondary treatment to ensure the stability of the effluent quality.

[0042] The equipment operation and maintenance area includes flow meters, electric valves, aeration blowers, valve group gas supply and distribution systems, automatic dosing systems, and intelligent control systems. As an integrated area for the assembly of reactor supporting equipment, the equipment operation and maintenance area is convenient for operation and maintenance.

[0043] The pulsed gas-liquid disturbance system includes a pulsed air diffuser, pulsed air pipeline, and pulsed air control valve. By controlling the valve opening and closing time period, the power air is intermittently injected into the pulsed air diffuser and pulsed air is released instantaneously, thereby promoting the mixing and flow of activated sludge mixed liquor. This type of pulsed gas-liquid disturbance system has less interference with dissolved oxygen in the mixed liquor, avoids the use of mechanical stirring, saves energy and reduces consumption, and also greatly reduces the failure rate.

[0044] The pneumatic reflux control system includes a power air control valve, an air supply line, a drainage line, and an air-lifting line. By controlling the opening and closing time of the valve, power air is intermittently blown into the air-lifting line, and the density difference of the activated sludge mixed liquor is used for lifting and drainage.

[0045] The pneumatic circulation control system includes a pneumatic internal circulation system in the anoxic reaction zone and a pneumatic internal circulation system in the aerobic reaction zone. The pneumatic internal circulation system in the anoxic reaction zone consists of a first stage of the anoxic reaction zone, a second stage of the anoxic reaction zone, and a pneumatic reflux control system. The pneumatic internal circulation system in the aerobic reaction zone consists of a sedimentation separation zone, a first stage of the aerobic reaction zone, and a pneumatic reflux control system. This reactor internal circulation system is cleverly designed using the parallel structure of the reactor partitions and combined with the pneumatic reflux control system to form an internal circulation. This method can effectively improve the processing efficiency and has the characteristics of being resistant to impact and high load.

[0046] The self-coupling reaction zone includes a microporous air diffusion system and a pulsed gas-liquid disturbance system. This reaction zone can be self-coupling and adjusted according to the actual water quality conditions. The adjustment is controlled by adjustment control valves. When the nitrogen content of the influent is high, the zone can be controlled to be in an anaerobic state. The ingenious design and utilization of this method enhances the reactor's effectiveness in treating decentralized small-scale sewage from rural areas, small towns, tourist attractions, various service areas, leisure resorts, hotels, schools, and other water environments, as well as point source sewage from ditches, ponds, rivers, lakes, and reservoirs. It is also better able to adapt to the changing characteristics of such sewage.

[0047] The valve assembly air supply and distribution system includes solenoid valve assemblies, controllers, air pressure balancing cylinders, and fans.

[0048] The intelligent control system can generate reactor operation reports, monitor operating conditions, and adjust process operating parameters. The intelligent control system can achieve automatic operation.

[0049] The microporous air diffusion system includes air supply pipelines, valves, and microporous air diffusers, which work in conjunction with the valve group air supply and distribution system to achieve oxygen supply control and dissolved oxygen stability in the aerobic reaction zone.

[0050] It also includes reactor system and process operation cycle design. The concentration of activated sludge in the reactor can be controlled at 3000mg / L to 7000mg / L. The activated sludge concentration is controlled at a high level, the system has good shock resistance, and the treatment effect is stable.

[0051] It also includes an integrated reactor design, with an appearance suitable for road and rail transport, facilitating construction, installation, and rapid emergency response. It features intelligent operation and management, visual human-machine interaction, and simplified operation and maintenance. It is highly adaptable to the treatment of decentralized small-scale sewage from rural areas, small towns, tourist attractions, various service areas, leisure resorts, hotels, schools, and point source sewage from ditches, ponds, rivers, lakes, and reservoirs.

[0052] This invention is mainly aimed at wastewater treatment methods and related equipment for decentralized small-scale sewage from rural areas, small towns, tourist attractions, various service areas, leisure resorts, hotels, schools, and point source sewage from ditches, ponds, rivers, lakes and reservoirs. It is used to solve the problems of simple processes and poor operational stability, low impact resistance, chaotic equipment selection and inconvenient operation, and high investment and operating costs of such equipment.

[0053] This invention is a pneumatically circulated self-coupling FAAO wastewater treatment reactor. The treatment scale can be designed according to actual conditions, and the treated effluent quality can meet the Class A standard limit in the "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plants" (GB18918-2002).

[0054] The effluent can be discharged directly in accordance with relevant standards and specifications, or it can be reused.

[0055] The wastewater treatment reactor is designed as follows:

[0056] Please refer to Figure 1 Zone I is the first corridor; Zone II is the second corridor; and Zone III is the third corridor.

[0057] Please refer to Figure 2 I1 is the facultative anaerobic reaction zone; I2 is the anaerobic reaction zone; I3 is the first stage of the anoxic reaction zone; 4 is the reactor equipment operation and maintenance zone; II5 is the second stage of the anoxic reaction zone; II6 is the autocoupling and blending reaction zone; II7 is the first stage of the aerobic reaction zone; III8 is the second stage of the aerobic reaction zone; III9 is ​​the sedimentation and separation zone; III10 is the coagulation and clarification zone.

[0058] Please refer to Figure 2 The reaction zone is divided into three parallel corridors from bottom to top. The first corridor, from left to right, contains an anaerobic reaction zone, an anaerobic reaction zone, and a section of an anoxic reaction zone. The second corridor, from right to left, contains two sections of an anoxic reaction zone, a self-coupling reaction zone, and a section of an aerobic reaction zone. The third corridor, from left to right, contains two sections of an aerobic reaction zone and a precipitation separation and clarification zone. The equipment operation and maintenance area is located on the far right side of the reactor.

[0059] I. Reactor Design

[0060] 1. S-shaped structure of the reactor

[0061] The reactor's S-shaped structural design includes a large S-shaped circulation structure and a small S-shaped guide vane structure. Three parallel corridors connected end-to-end within the reactor form the large S-shaped spatial arrangement, which, combined with the reactor's pneumatic circulation design, constitutes the large S-shaped circulation structure. Simultaneously, guide vanes are installed in each corridor, forming a small S-shaped guide vane structure. This structural form differs from traditional segmented and compartmentalized designs, fully utilizing water flow propulsion and circulation to create a small S-shaped guide flow in the longitudinal space and a large S-shaped reciprocating circulation in the transverse space. This S-shaped structure effectively reduces dead zones and increases the reactor's effective hydraulic residence time. Furthermore, the mixing and fusion of the rising and falling liquids in the small S-shaped guide flow, along with the propulsion of the large S-shaped circulation flow, improves the mixing effect of the mixed liquid, enhances mass transfer and mixing capacity, and achieves strong mixing and high mass transfer.

[0062] 2. Pneumatic reflux control system

[0063] The reactor's pneumatic reflux control system, combined with the reactor's S-shaped structure design, effectively reduces the resistance to the lifting of liquid by the powered air. Stable aerodynamics ensures stable liquid reflux, and the combined effect of a balancing cylinder for air distribution and a control valve assembly makes the pneumatic reflux controllable and stable. This reactor pneumatic reflux control system primarily achieves three functions:

[0064] Function 1: As an alternative design for pump lifting and conveying, it reduces installed power and failure rate of electromechanical equipment, while avoiding maintenance problems such as blade blockage caused by pump use;

[0065] Function 2: Reflux of the mixed liquor from the aerobic reaction zone to the anoxic reaction zone 1, i.e., reflux of the nitrification liquor;

[0066] Function 3: As a supporting system to the pneumatic circulation control system, it provides circulation power to realize the circulation of the mixed liquid.

[0067] 3. Pneumatic circulation control system

[0068] The reactor's pneumatic circulation control system is designed based on a pneumatic reflux control system and the reactor's S-shaped structure. The first and second corridors form the first major circulation zone, the second and third corridors form the second major circulation zone, and the first and third corridors form the third major circulation zone. The circulation power utilizes a pneumatic reflux control system instead of traditional pump-driven lifting and conveying, significantly reducing the equipment's installed power and energy consumption. The mixed liquor circulation and reflux within the three circulation zones greatly improves the reactor's treatment efficiency and shock resistance. This three-circulation design effectively balances and controls the activated sludge concentration in each reaction zone, maintaining a high sludge concentration within the reactor, thus significantly enhancing the reactor's shock resistance and processing load.

[0069] Simultaneously, an anaerobic internal circulation and a circulation from the anoxic zone to the facultative anaerobic zone are set up within the first major circulation zone. This setup effectively stabilizes the facultative, anaerobic, and anoxic environments, screens dominant bacterial species, and enhances nitrogen and phosphorus removal. Furthermore, this circulation method avoids the shock of increased dissolved oxygen in the anoxic mixed liquor caused by the direct recirculation of nitrification liquor from the aerobic reaction zone to the anoxic zone in traditional AAO processes. It effectively prevents the weakening of facultative and anaerobic bacteria due to factors such as insufficient water volume or low influent organic matter concentration. The increased stability of the facultative, anaerobic, and anoxic environments significantly enhances the efficiency of biological nitrogen and phosphorus removal in the reactor.

[0070] Within the second major circulation zone, an internal circulation section is set up between the sedimentation separation zone and the aerobic reaction zone, and another internal circulation section is set up between the second aerobic reaction zone and the anoxic reaction zone. This setup ensures that the sedimentation state in the sedimentation separation zone of the reactor is in a free sedimentation state, greatly improving the sedimentation separation rate and preventing the mixed liquor from forming layers and being compressed at the bottom of the sedimentation separation zone, thus improving the sedimentation separation effect. At the same time, the aerobic mixed liquor circulation can enhance the treatment degree, making the aerobic treatment of the reactor more thorough.

[0071] Within the third major circulation zone, a sedimentation separation zone is set up to anaerobic zone for circulation. This circulation can effectively ensure the concentration of the mixed liquor and the anaerobic environment in the anaerobic zone, making the entire system circulation form a whole and enhancing the reactor's treatment effect.

[0072] 4. Autocoupling reaction zone

[0073] The self-coupling reaction zone system within the reactor is a unique design specifically for the decentralized, small-scale wastewater treatment in rural areas, small towns, tourist attractions, various service areas, leisure resorts, hotels, schools, and other point-source wastewater treatment in water environments such as ditches, ponds, rivers, lakes, and reservoirs. This zone can self-couple and adjust the water quality according to the actual water quality at the facility site, especially for wastewater from villages and towns with low organic matter and high nitrogen content. This unique design greatly improves the adaptability of the equipment in different wastewater treatment scenarios, such as those in villages and towns.

[0074] The self-coupling reaction zone system is located within the reactor, between the first aerobic reaction zone and the second anoxic reaction zone. This zone is equipped with both a microporous air diffusion system and a pulsed gas-liquid disturbance system. Based on fluctuations in water flow and quality at different facility sites and their operational status, the operating conditions of this zone can be adjusted to maintain different states, such as aerobic or facultative anaerobic. When the influent has a high organic matter content, the aerobic reaction time needs to be extended, and this zone can be self-coupling-regulated to an aerobic state. Conversely, when the influent has a low organic matter content and a high nitrogen content, the facultative anaerobic reaction time needs to be extended, and this zone can be self-coupling-regulated to a facultative anaerobic state. In short, this zone can achieve spatial allocation within a certain range according to water quality conditions, effectively utilizing the equipment's performance and improving its applicability.

[0075] 5. Pulse gas-liquid disturbance system

[0076] The reactor's pulsed gas-liquid disturbance system, composed of a pulsed air diffuser, pulsed air pipelines, and pulsed air control valves, works in conjunction with an intelligent control system and the reaction zone structure to agitate the mixed liquid with pulsed air. This ensures the mixed liquid is fully mixed, achieves efficient mass transfer, and avoids excessive oxygenation. The pulsed air diffuser utilizes a unique structural design to store and energize the supplied air. Once the energy storage reaches the diffuser's design capacity, the energized air triggers diffusion and is instantaneously ejected, causing liquid agitation and ensuring complete mixing of the activated sludge mixture. Simultaneously, by controlling the valve's opening and closing cycle, powered air is intermittently injected into the pulsed air diffuser, making the entire system adjustable and facilitating dissolved oxygen control in different mixing reaction zones. This pulsed gas-liquid disturbance system replaces traditional mechanical stirring, reducing the reactor's installed power and further achieving low-carbon and energy-saving goals.

[0077] II. Implementation Instructions for Functional Zones

[0078] The reactor features an integrated pipeline design, with the inlet pipe connected to the reactor inlet interface. Wastewater sequentially enters the facultative anaerobic reaction zone, anaerobic reaction zone, anoxic reaction zone I, anoxic reaction zone II, self-coupling mixing reaction zone, aerobic reaction zone I, and aerobic reaction zone II, and is finally discharged after sedimentation and separation to meet discharge standards.

[0079] Wastewater first enters the anaerobic reaction zone, which mainly utilizes the dissolved oxygen in the mixture of raw water and return mixed liquor, fully maximizing the utilization of molecular oxygen in the mixed liquor. and The reaction is carried out when the carbon source in the raw water is sufficient to ensure the anaerobic environment of the subsequent anaerobic reaction zone, further avoid the interference of oxygen on the anaerobic phosphorus release of polyphosphate-accumulating bacteria, so that the anaerobic phosphorus release of polyphosphate-accumulating bacteria is more complete and the biological phosphorus removal efficiency is improved.

[0080] Then, the wastewater enters the anaerobic zone. The relatively stable anaerobic environment provides conditions for screening dominant bacterial groups. In addition, the relatively abundant carbon source in the raw water of this zone ensures the energy conditions for phosphorus release by polyphosphate-accumulating bacteria.

[0081] Following this, the wastewater enters the first and second anoxic reaction zones. In these zones, the microbial community utilizes the biodegradable organic matter in the raw water for nitrification, denitrification, and simultaneous nitrification and denitrification reactions. This zone primarily ensures the degradation of nitrogenous substances in the wastewater, with nitrogen ultimately released as nitrogen gas, while simultaneously degrading some of the organic matter. Furthermore, the internal circulation effect in this zone significantly enhances the treatment efficiency, making denitrification more stable and thorough.

[0082] The effluent from the second stage of the anoxic reaction zone enters the first stage of the aerobic reaction zone. Between these two zones is a self-coupling reaction zone. This zone is self-coupling-regulated according to the wastewater's characteristics and treatment requirements. When the influent C / N ratio is imbalanced, nitrogen content is high, and organic matter is low, and the average hydraulic retention time in the anoxic circulation zone is insufficient, this zone can be adjusted to function as an anaerobic / facultative anoxic zone to improve the reactor's treatment capacity when nitrogen content is high. If organic matter content is high, this zone will be adjusted to function as an aerobic reaction zone. Sufficient dissolved oxygen supply optimizes nitrification and aerobic reactions, resulting in significant degradation and removal of most organic matter and ammonia nitrogen.

[0083] The activated sludge treated by aerobic reaction enters the sedimentation separation zone, which is designed to be divided into two sections. The first sedimentation separation zone is for selecting the most active activated sludge, where it is recirculated and distributed, and the supernatant is separated. This supernatant then enters the second coagulation and clarification zone, where the less active activated sludge, after coagulation and clarification, is discharged as excess sludge. Sludge treated with coagulants is not mixed with the activated sludge, preventing long-term degradation of the activated sludge's activity due to chemical action. Simultaneously, this enhanced coagulation and clarification treatment in this zone effectively ensures the stability of the effluent quality.

[0084] This invention relates to a pneumatically circulated, self-coupling, FAAO (Feature-Acid-Oxygen-Based) wastewater treatment reactor. The equipment features an integrated operation and maintenance area, and intelligent equipment control. The intelligent control system can detect prolonged periods without water intake and intelligently adjust to a low-water-volume operating mode. It can also alert users to reactor malfunctions and current operating conditions, generate operational reports and logs, and automate reactor operation time control, enabling one-button start and stop. The intelligent control system utilizes an advanced programmable controller and a user-friendly touchscreen interface, ensuring stable operation, high visibility, and strong reliability. Furthermore, the reactor's intelligent control system includes a remote control module, enabling remote monitoring and control of the reactor equipment.

[0085] The visualized intelligent control design simplifies equipment operation, and the application of pneumatic power makes the reactor equipment more low-carbon and energy-efficient, reduces failures, and ensures reliable and convenient operation and maintenance while saving operating costs. It is highly targeted and applicable to the treatment of decentralized small-scale sewage and point source sewage such as ditches, ponds, rivers, lakes and reservoirs in rural areas, small towns, tourist attractions, various service areas, and leisure resorts.

[0086] This equipment is an intelligent, modular integrated reactor that is cost-effective in construction, convenient in installation, stable and economical in operation, easy in maintenance and management, simple in operation, and optimized in process performance. Furthermore, it offers greater savings throughout its entire lifespan.

[0087] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A pneumatically circulated self-coupling FAAO wastewater treatment reactor, characterized in that, It includes an anaerobic reaction zone, an anaerobic reaction zone, an anoxic cycle reaction zone, a self-coupling formulation reaction zone, an aerobic reaction zone, a precipitation separation and clarification zone, and an equipment operation and maintenance zone. Each functional zone is arranged in a unique S-shaped structure. The anoxic cycle reaction zone consists of an anoxic reaction zone section 1 and an anoxic reaction zone section 2, supplemented by a pneumatic circulation control system. The aerobic reaction zone is divided into an aerobic reaction zone section 1 and an aerobic reaction zone section 2, and microporous air diffusion systems are installed in both sections. The reactor, viewed from above, is divided into three corridors from bottom to top. The first corridor, from left to right, consists of an anaerobic reaction zone, an anaerobic reaction zone, and a section of an anoxic reaction zone. The second corridor, from right to left, consists of two sections of an anoxic reaction zone, a self-coupling mixing reaction zone, and a section of an aerobic reaction zone. The third corridor, from left to right, consists of two sections of an aerobic reaction zone and a precipitation separation and clarification zone. The equipment operation and maintenance area is located on the far right of the reactor; The reactor's S-shaped structure includes a large S-shaped circulation structure and a small S-shaped guide vane structure. The large S-shaped circulation structure consists of three channels arranged in parallel and connected end to end. The small S-shaped guide vane structure consists of guide vanes installed inside the large S-shaped circulation structure. The large S-shaped circulation structure and the small S-shaped guide vane structure together form the reactor's S-shaped strong mixing circulation flow structure configuration. The anaerobic reaction zone of the reactor is at the inlet end, and the anaerobic reaction zone is located to its right. The anoxic cycle reaction zone consists of an anoxic reaction zone section one and an anoxic reaction zone section two, supplemented by a pneumatic circulation control system. The facultative anaerobic reaction zone, anaerobic reaction zone and anoxic cycle reaction zone are all equipped with guide vanes, pulse gas-liquid disturbance system and pneumatic reflux control system. Combined with its structural form, the activated sludge mixed liquor in the zone can fully transfer mass, mix strongly and circulate, so as to achieve the purpose of high-efficiency reaction. The self-coupling reaction zone is located on the left side of the second section of the anoxic reaction zone, and a microporous air diffusion system and a pulsed gas-liquid disturbance system are installed inside it. The sedimentation separation and clarification zone is located on the right side of the second section of the aerobic reaction zone. It is divided into an activated sludge mixed liquor sedimentation separation zone and a coagulation clarification zone. The sedimentation separation zone is used for primary sedimentation separation of activated sludge mixed liquor and return of activated sludge. The supernatant after separation enters the coagulation clarification zone for secondary sedimentation and clarification. The sludge clarified in the secondary stage is discharged as excess sludge. The sedimentation separation and clarification zone is designed for secondary treatment. The equipment operation and maintenance area includes flow meters, electric valves, aeration blowers, valve group gas supply and distribution system, automatic dosing system and intelligent control system. As an integrated area for the assembly of reactor supporting equipment, the equipment operation and maintenance area is convenient for operation and maintenance. The self-coupling reaction zone includes a microporous air diffusion system and a pulsed gas-liquid disturbance system. This reaction zone is self-coupling according to the actual water quality. The mixing control valve is used for mixing control. When the organic matter content of the influent is high, the aerobic reaction time needs to be extended and this zone is self-coupling in an aerobic state. When the organic matter content of the influent is low and the nitrogen content is high, the facultative anaerobic reaction time needs to be extended and this zone is self-coupling in a facultative anaerobic state. The pneumatic reflux control system includes a power air control valve, an air supply line, a drainage line, and an air-lifting line. The power air control valve is used to intermittently blow power air into the air-lifting line, and the density difference of the activated sludge mixed liquor is used to lift and drain the liquid. The reactor’s first and second corridors form the first large circulation zone, the second and third corridors form the second large circulation zone, and the first and third corridors form the third large circulation zone. The circulation power adopts a pneumatic reflux control system. Within the first large circulation zone, there are anoxic internal circulation and circulation from the anoxic circulation reaction zone to the facultative anoxic reaction zone. Within the second major circulation zone, an internal circulation section is set up from the sedimentation separation zone to the aerobic reaction zone, and an internal circulation section is set up from the second aerobic reaction zone to the anoxic reaction zone. A precipitation separation zone to an anoxic reaction zone is set up in the third major circulation zone.

2. The pneumatically circulated self-coupling FAAO wastewater treatment reactor according to claim 1, characterized in that, The pulsed air-liquid disturbance system includes a pulsed air diffuser, a pulsed air pipeline, and a pulsed air control valve. By controlling the opening and closing time of the pulsed air control valve, power air is intermittently injected into the pulsed air diffuser, and pulsed air is released instantaneously, thereby promoting the mixing and flow of activated sludge mixed liquor.

3. The pneumatically circulated self-coupling FAAO wastewater treatment reactor according to claim 1, characterized in that, The valve assembly air supply and distribution system includes a solenoid valve assembly, a controller, a pressure balancing cylinder, and a blower.

4. The pneumatically circulated self-coupling FAAO wastewater treatment reactor according to claim 1, characterized in that, The intelligent control system can generate reactor operation reports, monitor operating conditions, and adjust process parameters. The intelligent control system can achieve automatic operation.

5. The pneumatically circulated self-coupling FAAO wastewater treatment reactor according to claim 1, characterized in that, The microporous air diffusion system includes two air supply lines, valves, and a microporous air diffuser. It works in conjunction with the valve group air supply and distribution system to achieve oxygen supply control and dissolved oxygen stability in the aerobic reaction zone.

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