Multistage push-flow self-reflux aerobic corridor

Abstract

This invention discloses a multi-stage plug-flow self-recirculating aerobic channel, relating to the field of wastewater treatment. It includes an aerobic channel body with a baffle plate installed in the center of its inner cavity. Both the outer wall of the baffle plate and the inner wall of the aerobic channel body are equipped with flow-tightening elements. A plug-flow aerator is installed within the inner cavity of the aerobic channel body. A DO probe is located at the top of the inner cavity of the aerobic channel body. There are at least two aerobic channel bodies connected in series. This multi-stage plug-flow self-recirculating aerobic channel, by connecting at least two aerobic channel bodies in series and dividing each aerobic channel body into a first and second channel via a baffle plate, essentially constructs multiple continuous AAO treatment units. Wastewater flows sequentially through these units, achieving multiple repetitions and enhancements of the treatment process, greatly improving treatment efficiency and effluent quality.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and in particular to a multi-stage plug-flow self-recirculating aerobic channel. Background Technology

[0002] In the current wastewater treatment field, aerobic treatment is one of the core components of biological treatment, with sequencing batch reactors (SBRs) or traditional plug flow aeration tanks being widely used. However, these traditional processes have many inherent drawbacks. First, traditional AAO processes typically require the construction of separate anaerobic, anoxic, and aerobic tanks, with mixed liquor recirculation achieved through pipelines and pumps. This design not only occupies a large area but also requires the recirculation pump to operate continuously, resulting in extremely high energy consumption. Furthermore, it easily causes the activated sludge flocs to break down and be lost, affecting the stability of the treatment system.

[0003] Secondly, in a single aerobic treatment unit, wastewater often exhibits a plug flow pattern, easily leading to short-circuiting and a shortened effective hydraulic retention time, resulting in unsatisfactory treatment efficiency. To meet discharge standards, it is often necessary to increase the tank volume or connect multiple treatment units in series, which further increases infrastructure costs and land area, and lacks flexibility, failing to adapt to changes in influent water quality. Aeration systems often use independent aeration blowers in conjunction with microporous aeration heads. This system suffers from problems such as easy clogging, unstable oxygen utilization, and high maintenance workload. Furthermore, the separation of aeration and plug flow functions requires additional plug flow equipment, increasing system complexity and energy consumption.

[0004] Furthermore, for wastewater pretreatment, conventional bar screen filters can only intercept larger suspended solids, and their effectiveness in treating fine fibrous materials or easily agglomerated debris is limited, easily causing blockages in subsequent pipes, pumps, and treatment units. At the same time, the filters require periodic shutdowns for manual cleaning, which is cumbersome and affects continuous operation. Dissolved oxygen (DO) is a key control parameter in aerobic treatment processes, but traditional processes typically only install DO probes at a few points within the tank, resulting in low control precision. This makes it difficult to accurately reflect the dissolved oxygen gradient in different areas of the entire reaction tank, and prevents precise start-up and shutdown of aeration equipment. This leads to either insufficient aeration affecting treatment efficiency or excessive aeration causing energy waste.

[0005] Therefore, it is necessary to propose a multi-stage push-flow self-recirculating aerobic corridor to solve the above problems. Summary of the Invention

[0006] The main objective of this invention is to provide a multi-stage push-flow self-recirculating aerobic corridor, which can effectively solve the problems in the background art.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A multi-stage push-flow self-recirculating aerobic corridor includes an aerobic corridor body, a baffle is installed in the center of the inner cavity of the aerobic corridor body, and flow-turbing elements are installed on the outer wall of the baffle and the inner wall of the aerobic corridor body. A push-flow aerator is installed in the inner cavity of the aerobic corridor body, and a DO probe is installed at the top of the inner cavity of the aerobic corridor body. There are at least two aerobic corridor bodies, and the two aerobic corridor bodies are connected in series; An inlet pipe is installed on the outer wall of the aerobic corridor body, and a pretreatment component is installed on the outer wall of the inlet pipe. A crushing blade is rotatably connected to one end of the inner cavity of the pretreatment component, a filter disc is installed in the center of the inner cavity of the pretreatment component, and a sedimentation tank is installed on the side of the bottom of the pretreatment component.

[0008] Preferably, the water inlet pipe is installed on the outer wall of one of the aerobic corridor bodies, and the aerobic corridor bodies are connected to each other by a pipe. A drain pipe is installed on the outer wall of the other aerobic corridor body, and a metering valve is connected to the water inlet pipe, the drain pipe, and the pipes by flanges.

[0009] Preferably, the inner cavity of the aerobic corridor body is divided into a first corridor and a second corridor by a partition, the turbulence element is located in the first corridor and the second corridor, and there are two push-flow aerators, which are located on opposite sides of the inner cavity of the first corridor and the second corridor, respectively.

[0010] Preferably, a reflux control gate is installed on the side of the inner cavity of the aerobic corridor body. The reflux control gate is a rotatable gate and is used to control the reflux flow of sewage in the inner cavity of the aerobic corridor body.

[0011] Preferably, three DO probes are installed in one of the aerobic corridor bodies. The three DO probes are respectively located in the first corridor, the second corridor and the junction of the first corridor and the second corridor. The DO probes are electrically connected to the plug-flow aerator.

[0012] Preferably, the pretreatment component communicates with the inner cavity of the water inlet pipe, a main shaft is rotatably connected in the inner cavity of the pretreatment component, a gear ring is installed on the outer wall of the main shaft near the end of the water inlet pipe, and a gear is rotatably connected to the top of the inner cavity of the pretreatment component, the gear meshing with the gear ring.

[0013] Preferably, a drive motor is mounted on the top of the pretreatment component, and a rotating shaft is mounted on the drive motor via a coupling. Synchronous pulleys are mounted on both the rotating shaft and the gear, and a synchronous belt is mounted on the outer wall of the two synchronous pulleys.

[0014] Preferably, the main shaft is rotatably connected to the center of the filter disc, the pulverizing blades are installed on the outer wall of the main shaft at the end away from the water inlet pipe, and a scraper is installed on the outer wall of the main shaft near the pulverizing blades, the scraper being attached to the outer wall of the filter disc.

[0015] Preferably, the pretreatment component is connected to the inner cavity of the sedimentation tank, and a waste discharge pipe is installed in the center of the bottom of the sedimentation tank, with a valve connected to the central flange on the outer wall of the waste discharge pipe.

[0016] Compared with the prior art, the present invention provides a multi-stage plug-flow self-recirculating aerobic corridor, which has the following beneficial effects: This multi-stage push-flow self-recirculating aerobic corridor achieves efficient multi-stage series and zoned treatment. By connecting at least two aerobic corridor bodies in series and dividing each aerobic corridor body into a first corridor and a second corridor by a partition, this device essentially constructs multiple continuous AAO treatment units. Wastewater flows through these units sequentially, realizing multiple repetitions and enhancements of the treatment process, which greatly improves treatment efficiency and effluent quality. This modular series design allows the system to flexibly increase or decrease the number of corridors according to the influent pollution load, giving it excellent adaptability and scalability.

[0017] This multi-stage plug-flow self-recirculating aerobic channel adopts a self-recirculating structure, which is energy-saving and protects sludge. By installing a rotatable recirculation control gate on the side inside each aerobic channel, the internal recirculation of the mixed liquor is achieved directly using the water flow dynamics within the channel, completely eliminating the need for the energy-intensive recirculation pumps used in traditional processes. This not only significantly reduces operating energy consumption, but more importantly, it avoids the shearing and damage of activated sludge flocs by the pump impeller, effectively reducing sludge loss and ensuring the stability and abundance of the microbial community within the biological system, thereby improving the stability and effectiveness of the treatment.

[0018] This multi-stage, self-recirculating aerobic channel cleverly combines flow propulsion and aeration, optimizing the flow pattern and simplifying the system. It employs a flow propulsion aerator, integrating both functions into a single device. While oxygenating the water, it effectively promotes a stable flow of wastewater within the channel, ensuring ample contact between wastewater and microorganisms. Furthermore, this design eliminates the need for complex blower ducts and microporous aeration systems, fundamentally avoiding aeration head clogging, simplifying the equipment structure, and reducing maintenance costs and energy consumption.

[0019] This multi-stage, self-recirculating aerobic channel extends the residence time and improves treatment efficiency through its flow-disrupting design. Flow-disrupting elements are installed on both the outer wall of the baffles and the inner wall of the aerobic channel itself. When wastewater flows through, it creates a turbulence effect, breaking the smooth flow pattern and increasing the tortuosity of the flow path. This significantly extends the actual hydraulic residence time of wastewater within the channel, effectively preventing short-circuiting and ensuring that pollutants have sufficient time to be degraded by microorganisms, thereby guaranteeing treatment precision and efficiency.

[0020] This multi-stage plug-flow self-recirculating aerobic channel achieves precise three-point monitoring and automatic control of dissolved oxygen (DO). A DO probe is installed in the first and second channels of each aerobic channel, as well as at their junction, for a total of three probes. This arrangement allows for accurate monitoring of the dissolved oxygen concentration gradient in different functional areas within the channel. Furthermore, the DO probes are electrically connected to the plug-flow aerators, enabling automatic control of the aerators' start and stop based on real-time DO data. This achieves on-demand aeration, ensuring the dissolved oxygen required for biochemical reactions while minimizing energy waste and realizing intelligent and precise control.

[0021] This multi-stage, self-recirculating aerobic channel integrates a highly efficient, self-cleaning pretreatment system. The pretreatment components, located at the inlet pipe, are driven by a motor and gear transmission, which in turn drives the pulverizing blades and scrapers on the main shaft. The pulverizing blades pre-crush large debris in the wastewater, preventing blockage of subsequent equipment. Next, a filter disc performs fine filtration, while the rotating scraper constantly adheres to the filter disc to remove filter residue, maintaining its unobstructed flow and achieving continuous self-cleaning operation. The intercepted debris is automatically discharged into a sedimentation tank for periodic removal. The entire pretreatment process is highly automated, effectively reducing the processing load on the subsequent aerobic channel and ensuring the stable operation of the main treatment system.

[0022] This multi-stage, self-recirculating aerobic channel achieves full-process flow control through metering valves and a return control gate. Metering valves are installed in the inlet, connecting, and outlet pipes, and combined with the adjustable return control gate, precise regulation of the entire system's inlet flow, inter-stage flow, return flow, and outlet flow is realized. This provides strong support for optimized system operation under different conditions, making operation more flexible and precise. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal cavity of the aerobic corridor of the present invention; Figure 3 This is a top view of the aerobic corridor body of the present invention; Figure 4 This is a cross-sectional view of the preprocessing component of the present invention.

[0024] In the diagram: 1. Aerobic channel body; 2. Baffle plate; 3. Bumper; 4. Flow aerator; 5. DO probe; 6. Inlet pipe; 7. Drain pipe; 8. Backflow control gate; 9. First channel; 10. Second channel; 11. Pretreatment assembly; 12. Sedimentation tank; 13. Waste discharge pipe; 14. Filter disc; 15. Main shaft; 16. Crushing blades; 17. Gear ring; 18. Gear; 19. Drive motor. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] Example 1: like Figures 1-3 As shown, a multi-stage push-flow self-recirculating aerobic corridor includes an aerobic corridor body 1, a baffle 2 installed in the center of the inner cavity of the aerobic corridor body 1, a flow-tightening element 3 installed on the outer wall of the baffle 2 and the inner wall of the aerobic corridor body 1, a push-flow aerator 4 installed in the inner cavity of the aerobic corridor body 1, and a DO probe 5 installed at the top of the inner cavity of the aerobic corridor body 1. There are at least two aerobic corridor bodies 1, which are connected in series. An inlet pipe 6 is installed on the outer wall of one of the aerobic corridor bodies 1. The aerobic corridor bodies 1 are connected to each other via pipes. A drain pipe 7 is installed on the outer wall of the other aerobic corridor body 1. Metering valves are flanged to the inlet pipe 6, drain pipe 7, and other pipes. The inner cavity of the aerobic corridor body 1 is divided into a first corridor 9 and a second corridor 10 by a partition 2. A flow-tightening element 3 is located in both the first and second corridors 9 and 10. There are two push-flow aerators 4, located in... On the opposite side of the inner cavity of the first corridor 9 and the second corridor 10, a backflow control gate 8 is installed on the side of the inner cavity of the aerobic corridor body 1. The backflow control gate 8 is a rotatable gate and is used to control the backflow of sewage in the inner cavity of the aerobic corridor body 1. Three DO probes 5 are installed in one aerobic corridor body 1. The three DO probes 5 are located at the junction of the first corridor 9, the second corridor 10 and the first corridor 9 and the second corridor 10, respectively. The DO probes 5 are electrically connected to the push-flow aerator 4.

[0027] Example 2: like Figure 1 , Figure 4As shown, a multi-stage push-flow self-recirculating aerobic channel is described. An inlet pipe 6 is installed on the outer wall of the aerobic channel body 1. A pretreatment component 11 is installed on the outer wall of the inlet pipe 6. A pulverizing blade 16 is rotatably connected to one end of the inner cavity of the pretreatment component 11. A filter disc 14 is installed in the center of the inner cavity of the pretreatment component 11. A sedimentation tank 12 is installed on the side of the bottom of the pretreatment component 11. The pretreatment component 11 communicates with the inner cavity of the inlet pipe 6. A main shaft 15 is rotatably connected to the inner cavity of the pretreatment component 11. A gear ring 17 is installed on the outer wall of the main shaft 15 near the end of the inlet pipe 6. A gear 18 is rotatably connected to the top of the inner cavity of the pretreatment component 11. The gear 18 and the gear... The ring 17 meshes with the pretreatment assembly 11. A drive motor 19 is installed on the top of the pretreatment assembly 11. The drive motor 19 is connected to a rotating shaft via a coupling. Synchronous pulleys are installed on both the rotating shaft and the gear 18. Synchronous belts are installed on the outer walls of the two synchronous pulleys. The main shaft 15 is rotatably connected to the center of the filter disc 14. The crushing blade 16 is installed on the outer wall of the main shaft 15 at the end away from the inlet pipe 6. A scraper is installed on the outer wall of the main shaft 15 near the crushing blade 16. The scraper is attached to the outer wall of the filter disc 14. The pretreatment assembly 11 communicates with the inner cavity of the sedimentation tank 12. A waste discharge pipe 13 is installed at the center of the bottom of the sedimentation tank 12. A valve is connected to the flange at the center of the outer wall of the waste discharge pipe 13.

[0028] It should be noted that this invention is a multi-stage plug-flow self-recirculating aerobic corridor. In use, there are four corridors in the inner cavity of the two aerobic corridor bodies 1, namely the first corridor 9 and the second corridor 10. Each individual corridor is a complete AAO treatment process. Wastewater enters the inner cavity of the first corridor 9 from the inlet pipe 6, and the plug-flow aerator 4 in the inner cavity is started, so that the wastewater flows along the corridor under its action. At the same time, the wastewater will come into contact with the turbulence 3, thereby playing a turbulence effect, which increases the residence time of the wastewater in the corridor to ensure treatment accuracy. The dissolved oxygen of the wastewater will gradually decrease at this time, thereby realizing the three-stage treatment of aerobic, anoxic and anaerobic, for simultaneous phosphorus removal. The series of aerobic corridor bodies 1 can improve the treatment efficiency of sewage. The number of corridors can be adjusted according to the concentration of sewage, thus ensuring its flexible use. A return flow control gate 8 is set at every two corridors. By controlling the rotation angle of the return flow control gate 8, the return flow of sewage in the inner cavity of the aerobic corridor body 1 can be controlled. Compared with the traditional return flow pump return, the self-return method of the corridor can save more energy and reduce sludge loss. During the wastewater treatment process inside the aerobic corridor 1, three DO probes 5 at different locations can control the start and stop of the push-flow aerator 4 based on the monitored values, thereby achieving precise control of dissolved oxygen and reducing energy consumption. The push-flow aerator 4 adopted has a simple structure and does not require a microporous aeration system or aeration blower. While realizing water oxygenation, it can also promote the flow of sewage in the first corridor 9 and the second corridor 10 in the inner cavity of the aerobic corridor body 1. Before entering the inner cavity of the inlet pipe 6, the sewage will be treated by the pretreatment component 11. The drive motor 19 is started, and the gear ring 17 is driven to rotate through the gear 18, so that the gear ring 17 can drive the crushing blades 16 and the scraper to work. At this time, the crushing blades 16 can crush the large-volume debris in the sewage, and the scraper will clean the filter disc 14. The remaining sewage can enter the inner cavity of the inlet pipe 6 through the filter disc 14. The debris filtered by the filter disc 14 can fall into the inner cavity of the sedimentation tank 12. The waste discharge pipe 13 can be opened to discharge the waste.

[0029] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A multi-stage push-flow self-recirculating aerobic corridor, comprising an aerobic corridor body (1), characterized in that: A baffle (2) is installed in the center of the inner cavity of the aerobic corridor body (1). Both the outer wall of the baffle (2) and the inner wall of the aerobic corridor body (1) are equipped with turbulence-inducing components (3). A push-flow aerator (4) is installed in the inner cavity of the aerobic corridor body (1). A DO probe (5) is installed at the top of the inner cavity of the aerobic corridor body (1). There are at least two aerobic corridor bodies (1), and the two aerobic corridor bodies (1) are connected in series; The aerobic corridor body (1) is equipped with an inlet pipe (6) on its outer wall. A pretreatment component (11) is installed on the outer wall of the inlet pipe (6). A crushing blade (16) is rotatably connected to one end of the inner cavity of the pretreatment component (11). A filter disc (14) is installed in the center of the inner cavity of the pretreatment component (11). A sedimentation tank (12) is installed on the side of the bottom of the pretreatment component (11).

2. The multi-stage plug-flow self-recirculating aerobic corridor according to claim 1, characterized in that: The inlet pipe (6) is installed on the outer wall of one of the aerobic corridor bodies (1). The aerobic corridor bodies (1) are connected to each other by a pipe. The outer wall of the other aerobic corridor body (1) is equipped with a drain pipe (7). The inlet pipe (6), drain pipe (7) and pipe are all connected to a metering valve by flange.

3. The multi-stage plug-flow self-recirculating aerobic corridor according to claim 1, characterized in that: The inner cavity of the aerobic corridor body (1) is divided into a first corridor (9) and a second corridor (10) by a partition (2). The turbulence-disrupting element (3) is located in the first corridor (9) and the second corridor (10). There are two push-flow aerators (4), and the two push-flow aerators (4) are located on opposite sides of the inner cavity of the first corridor (9) and the second corridor (10), respectively.

4. The multi-stage plug-flow self-recirculating aerobic corridor according to claim 1, characterized in that: A reflux control gate (8) is installed on the side of the inner cavity of the aerobic corridor body (1). The reflux control gate (8) is a rotatable gate and is used to control the reflux flow of sewage in the inner cavity of the aerobic corridor body (1).

5. A multi-stage plug-flow self-recirculating aerobic corridor according to claim 1, characterized in that: Three DO probes (5) are installed in one of the aerobic corridor bodies (1). The three DO probes (5) are located at the junction of the first corridor (9), the second corridor (10) and the first corridor (9) and the second corridor (10), respectively. The DO probes (5) are electrically connected to the push-flow aerator (4).

6. A multi-stage plug-flow self-recirculating aerobic corridor according to claim 1, characterized in that: The pretreatment component (11) communicates with the inner cavity of the water inlet pipe (6). A main shaft (15) is rotatably connected in the inner cavity of the pretreatment component (11). A gear ring (17) is installed on the outer wall of the main shaft (15) near the end of the water inlet pipe (6). A gear (18) is rotatably connected to the top of the inner cavity of the pretreatment component (11). The gear (18) meshes with the gear ring (17).

7. A multi-stage plug-flow self-recirculating aerobic corridor according to claim 6, characterized in that: The top of the pretreatment component (11) is equipped with a drive motor (19), which is connected to a rotating shaft via a coupling. Both the rotating shaft and the gear (18) are equipped with synchronous pulleys, and the outer walls of the two synchronous pulleys are equipped with synchronous belts.

8. A multi-stage plug-flow self-recirculating aerobic corridor according to claim 1, characterized in that: The main shaft (15) is rotatably connected to the center of the filter disc (14). The crushing blade (16) is installed on the outer wall of the main shaft (15) away from the water inlet pipe (6). A scraper is installed on the outer wall of the main shaft (15) near the crushing blade (16). The scraper is attached to the outer wall of the filter disc (14).

9. A multi-stage plug-flow self-recirculating aerobic corridor according to claim 1, characterized in that: The pretreatment component (11) is connected to the inner cavity of the sedimentation tank (12). A waste discharge pipe (13) is installed in the center of the bottom of the sedimentation tank (12), and a valve is connected to the flange in the center of the outer wall of the waste discharge pipe (13).

Images