Water body treatment denitrification and dephosphorization equipment

Abstract

The present application relates to water treatment technical field, especially to a kind of water treatment denitrification and phosphorus removal equipment.Its technical scheme includes: tank top is equipped with inlet pipe and outlet pipe, two ends are equipped with first end plate and second end plate, tank is separated to form anaerobic pool, anoxic pool and aerobic pool by first baffle and second baffle, respectively by first baffle and first end plate, between two baffles, second baffle and second end plate are enclosed to form.The transmission assembly is installed through each end plate and baffle, the drive of first end plate drives its action, and synchronous linkage aeration assembly.The reflux component is installed in the bottom end of tank, and the buffer component is connected with the reflux component and the aeration assembly, which has the functions of buffering the air pressure of the aeration assembly and driving the operation of the reflux component.The tank is supported and erected through the base at the bottom end.The present application links multiple components with single drive, saves additional power device and reduces energy consumption;energy is reused by buffer component, and water power condition is optimized by multiple pool design to improve treatment efficiency.

Description

Technical Field

[0001] This invention relates to the field of water treatment technology, specifically to a water treatment equipment for nitrogen and phosphorus removal. Background Technology

[0002] With the acceleration of industrialization and urbanization, the discharge of nitrogen- and phosphorus-containing wastewater continues to increase, and eutrophication of water bodies is becoming increasingly prominent, triggering a series of ecological and environmental problems such as cyanobacterial blooms and water quality deterioration, seriously threatening water resource security and ecological balance. Therefore, the development of efficient, energy-saving, and stable nitrogen and phosphorus removal equipment for water bodies is of great practical significance and application value for wastewater purification and treatment and improving water environmental quality.

[0003] Currently, most mainstream water nitrogen and phosphorus removal processes are based on anaerobic-anoxic-aerobic (A2-A3) water treatment. 2 The combined reaction principle of anaerobic / anoxic (A / O) utilizes the metabolic activity of microorganisms in different functional tanks to achieve phosphorus release and absorption, and nitrogen denitrification and nitrification, ultimately achieving nitrogen and phosphorus removal. To implement this process, existing equipment often adopts a multi-tank separate design or an integrated tank with internal partitioning. Baffles are used to divide the tank into anaerobic, anoxic, and aerobic tanks, allowing wastewater to flow sequentially through each reaction zone for treatment.

[0004] However, existing integrated nitrogen and phosphorus removal equipment still suffers from numerous technical shortcomings in practical applications, hindering improvements in treatment efficiency and energy-saving performance. Firstly, existing equipment struggles to precisely control hydraulic conditions to meet the specific operating requirements of different reaction tanks. Most employ a constant-velocity flow structure; anaerobic tanks require rapid flow to enhance microbial mixing and promote phosphorus release, while anoxic tanks need slower flow to extend hydraulic retention time and ensure denitrification. Existing structures cannot simultaneously meet both needs, making it difficult to optimize nitrogen and phosphorus removal simultaneously. Secondly, the coordination between the aeration and power systems is poor. Existing equipment often requires independent drive motors for aeration devices, using blowers and aeration discs to achieve aeration. This not only increases energy consumption and manufacturing costs but also results in uneven aeration and low gas utilization. Some compression aeration structures lack proper transmission and support design, leading to issues such as pipe misalignment, insufficient air intake, or rapid component wear, resulting in decreased aeration efficiency and affecting nitrification in aerobic tanks. Furthermore, pressure fluctuations generated during aeration cannot be effectively utilized, causing energy waste.

[0005] Third, the sediment reflux mechanism is poorly designed. Existing equipment's reflux systems largely rely on additional electric drives, further increasing energy consumption. Furthermore, the reflux power transmission efficiency is low and stability is poor. Some gravity reflux structures cannot achieve continuous and uniform sediment transport, easily leading to siltation and blockage. In addition, pressure fluctuations generated by aeration can easily impact pipelines and components, affecting the long-term operational stability of the equipment; existing equipment lacks an effective pressure buffer structure.

[0006] Fourth, the adaptability of water flow regulation in aerobic tanks is insufficient. Existing equipment mostly uses a fixed baffle structure, which cannot adaptively adjust the water flow rate and residence time according to fluctuations in the influent load. When the water volume or quality changes, problems such as excessively fast water flow leading to incomplete nitrification or excessively slow water flow causing sediment accumulation can easily occur. The equipment has a weak adaptability to complex operating conditions. At the same time, the drive system of existing equipment is mostly designed with multiple power sources, driving components such as propulsion, aeration, and recirculation separately. This not only results in a cumbersome structure and large footprint, but also increases the difficulty of equipment operation and maintenance and the failure rate. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a water treatment equipment for nitrogen and phosphorus removal, which solves the problems mentioned in the background art.

[0008] The solution of the present invention to the above-mentioned technical problems is as follows: This invention provides a water treatment device for nitrogen and phosphorus removal, comprising: The tank comprises an aeration assembly, a transmission assembly, a buffer assembly, and a reflux assembly. The tank has an inlet and outlet pipe at its top, and a first end plate and a second end plate at each end. Inside the tank are a first baffle and a second baffle. The first baffle and the first end plate enclose an anaerobic tank, the first baffle and the second baffle enclose an anoxic tank, and the second baffle and the second end plate enclose an aerobic tank. The transmission assembly is installed through the second end plate, the second baffle, the first baffle, and the first end plate. A drive component is mounted on the first end plate, which drives the transmission assembly and links it to the aeration assembly. The reflux assembly is installed at the bottom of the tank. One end of the buffer assembly is connected to the reflux assembly, and the other end is connected to the aeration assembly. It buffers the internal air pressure of the aeration assembly and drives the reflux assembly. The bottom of the tank is supported by a base.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the first baffle is provided with a first sleeve, and the second baffle is provided with a second sleeve; the transmission assembly includes a transmission shaft, on which a first auger and a second auger are mounted, the first auger being located inside the first sleeve, the second auger being located inside the second sleeve, and the pitch of the first auger being greater than the pitch of the second auger.

[0011] The beneficial effects of adopting the above-mentioned further scheme are as follows: the first and second sleeves can provide precise installation positioning and operational protection for the first and second augers, respectively, avoiding frictional interference between the augers and the baffles during operation. Simultaneously, they can prevent direct cross-flow of water between different tanks, ensuring the independence of the anaerobic and anoxic tanks. By setting augers with different pitches, the reaction requirements of the two tanks can be specifically adapted. The large-pitch first auger can enhance the water flow intensity in the anaerobic tank, improve the mixing uniformity of microorganisms and water, and promote efficient phosphorus release. The small-pitch second auger can slow down the water flow velocity in the anoxic tank, extend the hydraulic retention time, provide sufficient reaction time for denitrification, and achieve precise optimization of nitrogen and phosphorus removal effects. Compared with a uniform pitch design, this significantly improves the adaptability and treatment efficiency of different reaction stages.

[0012] Furthermore, the transmission assembly also includes a drive gear, a driven gear, a connecting frame, and a rubber extrusion wheel; the drive gear is installed at the end of the transmission shaft and is located outside the second end plate; the driven gear is rotatably installed on the second end plate and meshes with the drive gear; the connecting frame is connected to the driven gear; and the rubber extrusion wheel is rotatably installed at both ends of the connecting frame; the second end plate is provided with a support block for supporting the aeration assembly at the extrusion part of the rubber extrusion wheel.

[0013] The beneficial effects of adopting the above-mentioned further solutions are: Through the meshing transmission of the driving and driven gears, the rotational power of the drive shaft can be stably transmitted to the connecting frame, driving the rubber extrusion wheel to perform circumferential motion, thereby achieving periodic extrusion of the aeration component. This method offers high transmission efficiency and stable operation, eliminating the need for an additional aeration drive device, effectively simplifying the structure and reducing energy consumption. The support block provides reverse support force to the rubber tube, ensuring that an effective negative pressure is formed in the tube during extrusion, preventing tube misalignment that could lead to insufficient air intake. It also reduces wear on the rubber tube caused by uneven extrusion force, extending the service life of the aeration component and ensuring the continuity and stability of the aeration process.

[0014] Furthermore, the aeration assembly includes a rubber tube, a first tee pipe, a second tee pipe, and an aeration pipe; the rubber tube is arranged corresponding to the rubber extrusion wheel, with its upper end connected to the aerobic tank and an external air source through the first tee pipe, and its lower end connected to the aeration pipe and a buffer assembly through the second tee pipe; when the rubber extrusion wheel rotates and extrudes the rubber tube, it draws the external air source and the gas above the aerobic tank into the rubber tube.

[0015] The beneficial effects of adopting the above-mentioned further solutions are: Rubber hoses possess excellent elasticity and sealing properties, making them suitable for the compression-suction working mode. Compared to rigid pipes, they more easily create a negative pressure environment, resulting in higher suction efficiency. The first three-way pipe enables dual intake of gas from both external sources and the aerobic tank, allowing for the recovery and reuse of unreacted gas in the aerobic tank, reducing external gas consumption and lowering operating costs. The second three-way pipe rationally distributes the intake gas to the aeration pipes and buffer components, providing sufficient oxygen to the aerobic tank to ensure nitrification and also providing a power source for the buffer components, achieving secondary energy utilization. The aeration pipes evenly disperse gas within the aerobic tank, increasing the gas-liquid contact area, enhancing the metabolic activity of nitrifying bacteria, and further optimizing the nitrogen removal effect.

[0016] Furthermore, the buffer assembly is equipped with a piston plate, which divides the interior of the buffer assembly into two cavities; a push rod is installed at one end of the piston plate, which is connected to the reflux assembly, and a spring is installed in the cavity at the other end; the cavity on the side of the piston plate where the push rod is installed is connected to the second three-way pipe, and the air pressure is buffered through the cavity, while the push rod is driven to extend and retract within the reflux assembly by means of fluctuating air pressure.

[0017] The beneficial effects of adopting the above-mentioned further solutions are: The combined design of the piston plate and spring effectively absorbs pressure fluctuations caused by aeration gas, preventing damage to pipelines and aeration components from high-pressure impacts and ensuring the overall operational stability of the equipment. The push rod's extension and retraction are driven by pressure fluctuations, eliminating the need for an additional recirculation power unit and enabling secondary recovery and utilization of aeration energy, further reducing energy consumption. The spring provides a restoring force to the piston plate, ensuring the push rod reciprocates with pressure fluctuations, generating a continuous and stable power output. This provides uniform driving force to the recirculation components, resulting in greater energy savings and a lower failure rate compared to traditional electric recirculation structures.

[0018] Furthermore, the reflux assembly is equipped with a bracket and a pusher auger. The pusher auger is rotatably installed in the reflux assembly via the bracket. The end of the push rod is equipped with a threaded sleeve via a ratchet. The threaded sleeve is connected to the pusher auger via a spiral guide groove. When the push rod extends or retracts, it drives the pusher auger to rotate to push the sediment back into the reflux assembly.

[0019] The beneficial effects of adopting the above-mentioned further solutions are: The support frame provides a stable mounting for the auger, ensuring it doesn't easily shift when rotating to push sediment, thus improving operational stability. Through the transmission mechanism of a ratchet, threaded sleeve, and spiral guide groove, the linear extension and retraction motion of the push rod is converted into the rotational motion of the auger. The transmission structure is compact and highly efficient. The ratchet prevents the auger from rotating in the opposite direction, ensuring stable unidirectional transport of sediment. The auger enables continuous and uniform pushing of sediment, preventing sediment accumulation in the reflux assembly. Compared to traditional gravity reflux, it offers higher reflux efficiency and greater controllability, providing a reliable guarantee for sediment recycling.

[0020] Furthermore, the reflux assembly is provided with a first feed inlet, a second feed inlet, and a third feed inlet, which are respectively connected to the anaerobic tank, the anoxic tank, and the aerobic tank; a third guide plate, a second guide plate, and a first guide plate are respectively installed at the first feed inlet, the second feed inlet, and the third feed inlet; the second guide plate is set at half height and is used to divert the supernatant above the sediment to the anoxic tank, and the third guide plate is used to guide the reflux sediment to the anaerobic tank.

[0021] The beneficial effects of adopting the above-mentioned further solutions are: Three feed inlets correspond precisely to the three tanks, ensuring clear reflux paths and preventing interference from mixing different media. The first and third guide plates guide the sediment smoothly in and out of the reflux assembly, preventing inlet blockage. The half-height second guide plate efficiently separates the sediment from the supernatant, allowing the supernatant to reflux back to the anoxic tank for secondary denitrification, improving nitrogen removal efficiency. The sediment is precisely guided to the anaerobic tank to participate in phosphorus recycling, enhancing phosphorus removal. This design achieves graded treatment and recycling of different media, significantly improving the targeting and overall treatment efficiency of reflux treatment compared to designs without guide plates or with full-height guide plates.

[0022] Furthermore, an upper baffle and a lower baffle are provided between the second end plate and the second baffle; the two ends of the upper baffle are connected to the second end plate and the second baffle through upwardly inclined guide plates, and the two ends of the lower baffle are connected to the second end plate and the second baffle through downwardly inclined guide plates, and the two ends of the lower baffle are provided with slots; the upper baffle is provided with a flexible rubber plate, which is used to buffer the water flow, prolong the residence time of the water flow in the aerobic tank, and can automatically adjust the curvature according to the water pressure to regulate the flow rate.

[0023] The beneficial effects of adopting the above-mentioned further solutions are: The inclined guide plates, connecting the upper and lower baffles, guide and buffer the water flow in the aerobic tank, preventing direct impact on the tank body and extending the flow path to further increase the hydraulic retention time. The slots in the lower baffle facilitate the rapid fall of sediment to the return assembly, preventing sediment accumulation in the aerobic tank and reducing the frequency of equipment cleaning and maintenance. The flexible rubber plates have self-adjusting capabilities, automatically adjusting their curvature and spacing according to fluctuations in the influent load, achieving dynamic flow rate regulation. This ensures the water flow velocity remains stable within the range suitable for nitrification, preventing incomplete reactions due to water volume fluctuations, improving the equipment's adaptability to different water qualities and quantities, and guaranteeing the stability of treatment results.

[0024] Furthermore, the driving component is a motor, which is fixedly mounted on the first end plate, and its output end is connected to the transmission shaft to drive the overall movement of the transmission assembly.

[0025] The beneficial effects of adopting the above-mentioned further solutions are: As a mature and stable drive component, the motor provides uniform and controllable power output, allowing for precise adjustment of the drive shaft speed to adapt to different processing conditions. The motor is fixedly mounted on the first end plate, ensuring strong stability and preventing severe vibrations during operation, thus reducing impact on the overall equipment structure and extending its service life. Directly driving the drive shaft with the motor results in a short transmission path and low losses, simultaneously driving the auger propulsion, gear-driven aeration, and subsequent recirculation actions. This integrated multi-component linkage simplifies the structure, enhances control convenience, reduces operational failure rates, and facilitates equipment installation, commissioning, and subsequent maintenance.

[0026] Therefore, the water treatment denitrification and phosphorus removal equipment provided by this invention has the following beneficial effects: To address the different reaction requirements of the anaerobic and anoxic tanks, a large-pitch auger is used to rapidly propel the water in the anaerobic tank, enhancing the mixing and contact between the water and anaerobic microorganisms, creating sufficient reaction conditions for efficient phosphorus release. Simultaneously, a small-pitch auger is used to slow the water flow in the anoxic tank, extending the hydraulic retention time and ensuring that denitrifying bacteria fully degrade nitrogen in the water, achieving thorough denitrification. This targeted design optimizes the operating conditions of the two key reaction stages (anaerobic and anoxic), avoiding the incomplete reaction problems caused by the uniformity of water flow velocity in traditional equipment, and significantly improving the overall nitrogen and phosphorus removal efficiency.

[0027] By using a single drive unit to rotate the transmission shaft, the system achieves both the flow-pushing function of the double auger and the cyclical compression of the rubber tube by the gear meshing of the rubber extrusion wheel. This eliminates the need for an additional aeration power unit, significantly reducing the number of power sources and energy consumption. Simultaneously, the rubber tube compression aeration mode can draw in both external air and gas from above the aerobic tank. This increases the aeration volume and allows for the recovery and reuse of unreacted gas from the aerobic tank, reducing the consumption of external air sources. Furthermore, the support blocks ensure the stability of the rubber tube compression process, preventing uneven aeration caused by tube misalignment and further enhancing the nitrification effect in the aerobic tank.

[0028] The buffer component effectively absorbs pressure fluctuations generated during aeration, preventing damage to the aeration system and pipelines from pressure shocks and ensuring long-term stable operation of the equipment. Simultaneously, it utilizes pressure fluctuations to drive the extension and retraction of the push rod, which in turn drives the auger via a ratchet and spiral guide groove transmission structure. This eliminates the need for an additional return drive motor, enabling secondary utilization of aeration energy and further reducing operating costs. The sediment is transported back to the anaerobic tank via the auger, allowing any unreleased phosphorus to participate in the anaerobic phosphorus release reaction again, forming a phosphorus recycling process and significantly improving phosphorus removal efficiency. Furthermore, the guide plate design of the return component allows for precise separation of sediment and supernatant, with the supernatant returning to the anoxic tank for secondary denitrification, further optimizing the overall treatment effect.

[0029] The flexible rubber plate can automatically adjust its curvature according to the water flow pressure, thereby adaptively regulating the water flow rate and avoiding sudden changes in water flow velocity caused by fluctuations in the influent load. At the same time, it extends the residence time of the water in the aerobic tank, ensuring that the nitrification reaction is fully carried out. The inclined guide plate connection structure between the upper and lower baffles can effectively guide and buffer the water flow. The slot design of the lower baffle facilitates the rapid fall of sediment to the return component, preventing sediment from accumulating in the aerobic tank, reducing the frequency of equipment cleaning and maintenance, and lowering operation and maintenance costs. Attached Figure Description

[0030] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0031] In the attached diagram: Figure 1 This is a schematic diagram of the main appearance of the present invention; Figure 2 This is a rear view diagram of the present invention; Figure 3 This is a schematic diagram of the front half-section structure of the present invention; Figure 4 This is a rear half-section structural schematic diagram of the present invention; Figure 5This is a cross-sectional view of the upper and lower baffles of the present invention; Figure 6 This is a schematic diagram of the external appearance of the drive shaft of the present invention; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8 This is a schematic diagram of the appearance of the recirculation component of the present invention; Figure 9 This is a schematic diagram of a half-section of the recirculation assembly of the present invention.

[0032] The attached diagram lists the components represented by each number as follows: 1. Tank body; 101. Inlet pipe; 102. Outlet pipe; 103. Support block; 104. Base; 105. Motor; 106. First sleeve; 107. Second sleeve; 108. Upper baffle; 109. Flexible rubber sheet; 110. Second end plate; 111. Second baffle; 112. First baffle; 113. First end plate; 114. Lower baffle; 115. Groove; 2. Aeration assembly; 201. Aeration pipe; 202. First tee pipe; 203. Rubber hose; 204. Second tee pipe; 3. Transmission 301. Drive shaft; 302. First auger; 303. Second auger; 304. Driven gear; 305. Rubber extrusion wheel; 306. Connecting frame; 307. Drive gear; 4. Buffer assembly; 401. Push rod; 402. Spring; 403. Piston plate; 5. Return assembly; 501. Pushing auger; 502. Support; 503. First feed port; 504. Second feed port; 505. Third feed port; 506. First guide plate; 507. Second guide plate; 508. Third guide plate. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figures 1 to 9 As shown, the embodiments provided by the present invention are as follows: Example 1 A water treatment equipment for nitrogen and phosphorus removal includes: Tank 1, aeration assembly 2, transmission assembly 3, buffer assembly 4, and reflux assembly 5; Tank 1 is provided with an inlet pipe 101 and an outlet pipe 102 at the top, and a first end plate 113 and a second end plate 110 are installed at both ends. A first baffle 112 and a second baffle 111 are provided inside the tank. The first baffle 112 and the first end plate 113 enclose an anaerobic tank, the first baffle 112 and the second baffle 111 enclose an anoxic tank, and the second baffle 111 and the second end plate 110 enclose an aerobic tank. The transmission assembly 3 is installed through the second end plate 110, the second baffle 111, the first baffle 112 and the first end plate 113. The first end plate 113 is provided with a driving component, which drives the transmission assembly 3 to move and links the aeration assembly 2. The return assembly 5 is installed at the bottom of the tank 1. One end of the buffer assembly 4 is connected to the return assembly 5 and the other end is connected to the aeration assembly 2. It is used to buffer the internal air pressure of the aeration assembly 2 and drive the return assembly 5 to run. The bottom of the tank 1 is supported by the base 104.

[0035] Example 2 To further optimize the hydraulic conditions of anaerobic and anoxic tanks and the power transmission efficiency of the aeration system, enhance the targeted treatment effect at different reaction stages, and improve the overall efficiency of nitrogen and phosphorus removal, for example, such as Figures 1 to 9 As shown, the present invention also includes: The first baffle 112 is provided with a first sleeve 106, and the second baffle 111 is provided with a second sleeve 107. The transmission assembly 3 includes a transmission shaft 301, on which a first auger 302 and a second auger 303 are installed. The first auger 302 is located inside the first sleeve 106, and the second auger 303 is located inside the second sleeve 107. The pitch of the first auger 302 is greater than that of the second auger 303. The first sleeve 106 and the second sleeve 107 can provide precise installation positioning and operation protection for the first auger 302 and the second auger 303, respectively, to avoid friction interference between the augers and the baffles during operation. At the same time, they can prevent direct cross-flow of water from different pools, ensuring the independence of the working conditions of the anaerobic pool and the anoxic pool. By setting augers with different pitches, the reaction requirements of the two tanks can be specifically adapted. The large-pitch first auger 302 can enhance the water flow intensity in the anaerobic tank, improve the mixing uniformity of microorganisms and water, and promote efficient phosphorus release. The small-pitch second auger 303 can slow down the water flow velocity in the anoxic tank, extend the hydraulic retention time, provide sufficient reaction time for the denitrification reaction, and achieve precise optimization of nitrogen and phosphorus removal effects. Compared with the equal pitch design, it greatly improves the adaptability and treatment efficiency of different reaction stages.

[0036] The transmission assembly 3 also includes a drive gear 307, a driven gear 304, a connecting frame 306, and a rubber extrusion wheel 305. The drive gear 307 is installed at the end of the transmission shaft 301 and is located outside the second end plate 110. The driven gear 304 is rotatably installed on the second end plate 110 and meshes with the drive gear 307. The connecting frame 306 is connected to the driven gear 304. The rubber extrusion wheel 305 is rotatably installed at both ends of the connecting frame 306. The second end plate 110 is provided with a support block 103 for supporting the aeration assembly 2 at the extrusion part of the rubber extrusion wheel 305. Through the meshing transmission of the drive gear 307 and the driven gear 304, the rotational power of the transmission shaft 301 can be stably transmitted to the connecting frame 306, driving the rubber extrusion wheel 305 to make a circular motion, realizing the periodic extrusion of the aeration assembly 2. The transmission efficiency is high and the operation is stable. There is no need to configure an additional aeration drive device, which effectively simplifies the structure and reduces energy consumption. The support block 103 can provide reverse support force for the rubber tube 203, ensuring that the tube body can form an effective negative pressure when the rubber extrusion wheel 305 extrudes, avoiding tube body deviation and insufficient air intake, while reducing wear of the rubber tube 203 caused by uneven extrusion force, extending the service life of the aeration component 2, and ensuring the continuity and stability of the aeration process.

[0037] The aeration component 2 includes a rubber tube 203, a first three-way pipe 202, a second three-way pipe 204, and an aeration pipe 201. The rubber tube 203 is set corresponding to the rubber extrusion wheel 305. The upper end is connected to the aerobic tank and the external air source through the first three-way pipe 202, and the lower end is connected to the aeration pipe 201 and the buffer component 4 through the second three-way pipe 204. When the rubber extrusion wheel 305 rotates and extrudes the rubber tube 203, it draws the external air source and the air above the aerobic tank into the rubber tube 203. The rubber tube 203 has good elasticity and sealing properties, and is suitable for the extrusion and suction working mode. Compared with rigid pipes, it is easier to form a negative pressure environment and has higher suction efficiency. The first three-way pipe 202 enables dual intake of gas from both external gas sources and the aerobic tank, allowing for the recovery and reuse of unreacted gas from the aerobic tank, reducing external gas consumption and lowering operating costs. The second three-way pipe 204 rationally distributes the intake gas to the aeration pipe 201 and the buffer component 4, providing sufficient oxygen to the aerobic tank to ensure nitrification and also providing a power source for the buffer component 4, enabling secondary energy utilization. The aeration pipe 201 evenly disperses the gas within the aerobic tank, increasing the gas-liquid contact area, enhancing the metabolic activity of nitrifying bacteria, and further optimizing the nitrogen removal effect.

[0038] Example 3 To achieve efficient buffering of aeration pressure and secondary energy utilization, while optimizing the sediment recycling mechanism and balancing energy consumption control with the stability of treatment effect, for example, such as Figures 1 to 9 As shown, the present invention also includes: The buffer assembly 4 is equipped with a piston plate 403, which divides the interior of the buffer assembly 4 into two chambers. A push rod 401 is installed at one end of the piston plate 403, and the push rod 401 is plugged into the return assembly 5. A spring 402 is installed in the other chamber. The chamber on the side of the piston plate 403 with the push rod 401 is connected to the second three-way pipe 204. The chamber buffers the air pressure, and the push rod 401 is driven to extend and retract within the return assembly 5 by the fluctuating air pressure. The combined design of the piston plate 403 and the spring 402 effectively absorbs the air pressure fluctuations brought by the aeration gas, preventing high-pressure impacts from damaging the pipeline and aeration assembly 2, and ensuring the overall operational stability of the equipment. By driving the push rod 401 to extend and retract through air pressure fluctuations, no additional return power device is required, achieving secondary recovery and utilization of aeration energy and further reducing energy consumption. Spring 402 provides a reset force for piston plate 403, ensuring that push rod 401 can reciprocate with air pressure fluctuations, forming a continuous and stable power output, providing uniform driving force for recirculation assembly 5. Compared with traditional electric recirculation structure, it is more energy-efficient and has a lower failure rate.

[0039] The reflux assembly 5 includes a bracket 502 and a pusher auger 501. The pusher auger 501 is rotatably mounted within the reflux assembly 5 via the bracket 502. A threaded sleeve is mounted on the end of the push rod 401 via a ratchet. The threaded sleeve is connected to the pusher auger 501 via a spiral guide groove. When the push rod 401 extends or retracts, it drives the pusher auger 501 to rotate and push the sediment back. The bracket 502 provides a stable mounting support for the pusher auger 501, ensuring that it is not prone to deviation when rotating and pushing sediment, thus improving operational stability. Through the transmission cooperation of the ratchet, threaded sleeve, and spiral guide groove, the linear extension and retraction motion of the push rod 401 can be converted into the rotational motion of the pusher auger 501. The transmission structure is compact and highly efficient. The ratchet prevents the pusher auger 501 from rotating in the opposite direction, ensuring stable unidirectional conveying of sediment. The pusher auger 501 can continuously and uniformly push the sediment, avoiding sediment accumulation in the reflux component 5. Compared with traditional gravity reflux, the reflux efficiency is higher and the controllability is stronger, providing a reliable guarantee for sediment recycling.

[0040] The reflux assembly 5 is equipped with a first feed inlet 503, a second feed inlet 504, and a third feed inlet 505, which are respectively connected to the anaerobic tank, the anoxic tank, and the aerobic tank. A third guide plate 508, a second guide plate 507, and a first guide plate 506 are installed at the first feed inlet 503, the second feed inlet 504, and the third feed inlet 505, respectively. The second guide plate 507 is set at half height and is used to divert the supernatant above the sediment to the anoxic tank. The third guide plate 508 is used to guide the reflux sediment to the anaerobic tank. The three feed inlets correspond to the three tanks respectively to achieve precise connection, clarify the reflux path, and avoid the mixing and interference of different media. The first guide plate 506 and the third guide plate 508 guide the sediment smoothly into and out of the reflux assembly 5, preventing clogging of the feed inlet. The half-height second guide plate 507 enables efficient separation of sediment and supernatant, allowing the supernatant to be returned to the anoxic tank for secondary denitrification, improving nitrogen removal efficiency. The sediment is precisely guided to the anaerobic tank to participate in phosphorus recycling and release, enhancing phosphorus removal. This design achieves graded treatment and recycling of different media, significantly improving the targeting and overall treatment efficiency of the reflux process compared to designs without guide plates or with full-height guide plates.

[0041] Example 4 To optimize the water flow and residence time in the aerobic tank, enhance the adaptive capability of water flow regulation, and avoid the impact of influent load fluctuations on the nitrification reaction, for example, such as Figures 1 to 9 As shown, the present invention also includes: An upper baffle 108 and a lower baffle 114 are provided between the second end plate 110 and the second baffle 111. The upper baffle 108 is connected to the second end plate 110 and the second baffle 111 at both ends via upwardly inclined guide plates. The lower baffle 114 is connected to the second end plate 110 and the second baffle 111 at both ends via downwardly inclined guide plates, and slots 115 are provided at both ends of the lower baffle 114. A flexible rubber plate 109 is provided on the upper baffle 108 to buffer the water flow, extend the water residence time in the aerobic tank, and automatically adjust the curvature according to water pressure to regulate the flow rate. The upper baffle 108 and lower baffle 114 connected by inclined guide plates can guide and buffer the water flow in the aerobic tank, preventing the water flow from directly impacting the tank body, while extending the water flow path and further increasing the hydraulic residence time. The slots 115 of the lower baffle 114 facilitate the rapid fall of sediment to the return assembly 5, preventing sediment accumulation in the aerobic tank and reducing the frequency of equipment cleaning and maintenance. The flexible rubber plate 109 has self-adjusting capability, which can automatically adjust the curvature and the spacing between the plates according to the fluctuation of the influent load, realize the dynamic adjustment of the flow rate, ensure that the water flow rate is stable within the range suitable for the nitrification reaction, avoid incomplete reaction due to water volume fluctuations, improve the adaptability of the equipment to different water quality and quantity, and ensure the stability of the treatment effect.

[0042] Example 5 To provide a stable and reliable integrated drive solution, simplify the equipment power structure, improve transmission efficiency and operational controllability, and reduce equipment maintenance difficulty, for example, such as Figures 1 to 9 As shown, the present invention also includes: The driving component is a motor 105, which is fixedly mounted on the first end plate 113. Its output end is connected to the drive shaft 301 to drive the entire transmission assembly 3. As a mature and stable driving component, the motor 105 provides uniform and controllable power output, allowing precise adjustment of the drive shaft 301 speed to adapt to different processing conditions. The motor 105's fixed mounting on the first end plate 113 ensures strong stability, preventing severe vibrations during operation, reducing impact on the overall equipment structure, and extending the equipment's service life. Directly driving the drive shaft 301 with the motor 105 results in a short transmission path and low loss. It can simultaneously drive the auger propulsion, gear-driven aeration, and subsequent recirculation actions, achieving integrated linkage of multiple components. Compared to a multi-drive source design, this approach simplifies the structure, makes control more convenient, reduces the failure rate, and facilitates equipment installation, commissioning, and subsequent maintenance.

[0043] Working principle: The water to be treated enters tank 1 through inlet pipe 101 at the top of tank 1, flows sequentially through anaerobic tank, anoxic tank and aerobic tank along the inner cavity of the tank, and after completing multi-stage reaction treatment, is finally discharged through top outlet pipe 102. When the equipment is started, the drive unit installed at one end of tank 1 starts to operate, driving the transmission assembly 3 to move as a whole, providing stable power support for subsequent aeration, propulsion and reflux stages.

[0044] The drive shaft 301 of the transmission assembly 3 rotates synchronously under the drive of the driving component, thereby driving the first auger 302 and the second auger 303 on the drive shaft to operate in coordination. The first auger 302 is located in the first sleeve 106 of the first baffle 112. Due to its larger pitch, it can create a strong and rapid propulsion effect on the water in the anaerobic tank when it rotates, effectively enhancing the mixing and contact between the water and the microorganisms in the tank, and creating optimal reaction conditions for phosphorus release and microbial proliferation under anaerobic conditions. The second auger 303 is located in the second sleeve 107 of the second baffle 111. Its pitch is smaller than that of the first auger 302. When it rotates, it can significantly slow down the water flow propulsion speed, prolong the hydraulic residence time of the water in the anoxic tank, fully promote the denitrification reaction of denitrifying bacteria, and achieve efficient degradation and removal of nitrogen in the water.

[0045] As the drive shaft 301 rotates, the driving gear 307 at its end meshes synchronously, driving the driven gear 304 to rotate. This causes the connecting frame 306, which is fixedly connected to the driven gear 304, to move in a circular motion with the driven gear 304, thereby driving the rubber extrusion rollers 305 at both ends of the connecting frame 306 to rotate cyclically. During the rotation of the rubber extrusion rollers 305, they periodically extrude pressure on the rubber tube 203 of the aeration component 2. Combined with the stable support provided by the support block 103 on the second end plate 110, a negative pressure environment is created inside the rubber tube 203. Through the first three-way pipe 202, external air source and gas from above the aerobic tank are simultaneously drawn into the rubber tube 203. The inhaled gas is reasonably divided through the second three-way pipe 204 at the lower end of the rubber tube 203. Part of it is evenly sent into the aerobic tank through the aeration pipe 201 to provide sufficient oxygen for the nitrifying bacteria in the aerobic tank, promote the efficient nitrification reaction, and convert ammonia nitrogen in the water into nitrate nitrogen. The other part is passed into the buffer component 4 to provide a power source for the subsequent return flow.

[0046] After the water enters the aerobic tank from the anoxic tank, it fully contacts and reacts with aerobic microorganisms under the stirring action of the aeration gas. At the same time, the upper baffle 108 and lower baffle 114 in the aerobic tank effectively guide and buffer the water flow. The upper baffle 108 is firmly connected to the second end plate 110 and the second baffle 111 through an upwardly inclined guide plate. The flexible rubber plate 109 on it can automatically adjust its curvature according to the water flow pressure, thereby changing the spacing between the plates and realizing adaptive regulation of the water flow rate. At the same time, it effectively buffers the water flow velocity and further extends the residence time of the water in the aerobic tank, ensuring that the nitrification reaction is sufficient and thorough. The lower baffle 114 is connected and fixed to the second end plate 110 and the second baffle 111 through a downwardly inclined guide plate. The slots 115 at both ends of it allow the sediment produced in the reaction in the aerobic tank to fall smoothly into the return component 5 at the bottom.

[0047] The air pressure fluctuations generated during the operation of the aeration component 2 are transmitted to the buffer component 4 through the pipeline. The piston plate 403 in the buffer component 4 divides the cavity into two independent areas. After receiving the air pressure fluctuations, the cavity connected to the aeration component 2 pushes the piston plate 403 to reciprocate against the elastic force of the spring 402 on the other side. This, in turn, drives the push rod 401 on the piston plate 403 to move synchronously in and out of the return component 5. When the push rod 401 extends or retracts, its end forms a spiral guide groove with the pusher auger 501 in the return component 5 through a threaded sleeve installed by a ratchet. This drives the pusher auger 501 to rotate stably around the support 502, realizing the orderly transport and return of the sediment.

[0048] The sediment in the aerobic tank falls through the trough 115 and is precisely guided into the interior of the return assembly 5 through the third feed port 505 and the first guide plate 506. As the pusher auger 501 rotates, it continuously transports the sediment towards the anaerobic tank. The second guide plate 507 on the return assembly 5 is set at half height, which can divert the supernatant above the sediment to the anoxic tank, allowing the supernatant to participate in the denitrification reaction again, further improving the nitrogen removal efficiency. The third guide plate 508 precisely guides the transported sediment to the anaerobic tank, allowing the phosphorus in the sediment to be released again in the anaerobic environment and participate in the recycling process, significantly enhancing the phosphorus removal effect of the equipment.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A water treatment equipment for nitrogen and phosphorus removal, characterized in that, include: The tank (1), aeration assembly (2), transmission assembly (3), buffer assembly (4), and reflux assembly (5) are provided. The top of the tank (1) is provided with an inlet pipe (101) and an outlet pipe (102), and the two ends are equipped with a first end plate (113) and a second end plate (110). The tank is provided with a first baffle (112) and a second baffle (111). The first baffle (112) and the first end plate (113) enclose an anaerobic tank, the first baffle (112) and the second baffle (111) enclose an anoxic tank, and the second baffle (111) and the second end plate (110) enclose an aerobic tank. The transmission assembly (3) is installed through the second end plate (110), the second baffle (111), the first baffle (112) and the first end plate (113). The first end plate (113) is provided with a driving component, which drives the transmission assembly (3) to move and link with the aeration assembly (2). The return assembly (5) is installed at the bottom of the tank (1). One end of the buffer assembly (4) is connected to the return assembly (5) and the other end is connected to the aeration assembly (2). It is used to buffer the internal air pressure of the aeration assembly (2) and drive the return assembly (5) to run. The bottom of the tank (1) is supported by a base (104).

2. The water treatment denitrification and phosphorus removal equipment according to claim 1, characterized in that: The first baffle (112) is provided with a first sleeve (106), and the second baffle (111) is provided with a second sleeve (107); the transmission assembly (3) includes a transmission shaft (301), on which a first auger (302) and a second auger (303) are installed. The first auger (302) is located inside the first sleeve (106), and the second auger (303) is located inside the second sleeve (107). The pitch of the first auger (302) is greater than the pitch of the second auger (303).

3. The water treatment denitrification and phosphorus removal equipment according to claim 2, characterized in that: The transmission assembly (3) further includes a drive gear (307), a driven gear (304), a connecting frame (306), and a rubber extrusion wheel (305); the drive gear (307) is installed at the end of the transmission shaft (301) and located outside the second end plate (110); the driven gear (304) is rotatably installed on the second end plate (110) and meshes with the drive gear (307); the connecting frame (306) is connected to the driven gear (304); the rubber extrusion wheel (305) is rotatably installed at both ends of the connecting frame (306); the second end plate (110) is provided with a support block (103) for supporting the aeration assembly (2) at the extrusion part of the rubber extrusion wheel (305).

4. The water treatment denitrification and phosphorus removal equipment according to claim 3, characterized in that: The aeration assembly (2) includes a rubber tube (203), a first three-way pipe (202), a second three-way pipe (204), and an aeration pipe (201). The rubber tube (203) is set with respect to the rubber extrusion wheel (305). The upper end is connected to the aerobic tank and the external air source through the first three-way pipe (202), and the lower end is connected to the aeration pipe (201) and the buffer assembly (4) through the second three-way pipe (204). When the rubber extrusion wheel (305) rotates and extrudes the rubber tube (203), it draws the external air source and the gas above the aerobic tank into the rubber tube (203).

5. The water treatment denitrification and phosphorus removal equipment according to claim 1, characterized in that: The buffer assembly (4) is provided with a piston plate (403), which divides the interior of the buffer assembly (4) into two cavities. A push rod (401) is installed at one end of the piston plate (403), and the push rod (401) is connected to the return assembly (5). A spring (402) is installed in the cavity at the other end. The cavity on the side of the piston plate (403) where the push rod (401) is installed is connected to the second three-way pipe (204). The cavity buffers the air pressure, and at the same time, the push rod (401) is driven to move in and out of the return assembly (5) by means of fluctuating air pressure.

6. The water treatment denitrification and phosphorus removal equipment according to claim 5, characterized in that: The reflux assembly (5) is provided with a bracket (502) and a pusher auger (501). The pusher auger (501) is rotatably installed in the reflux assembly (5) through the bracket (502). The end of the push rod (401) is equipped with a threaded sleeve through a ratchet. The threaded sleeve is connected to the pusher auger (501) through a spiral guide groove. When the push rod (401) extends or retracts, it drives the pusher auger (501) to rotate to push the sediment back.

7. The water treatment denitrification and phosphorus removal equipment according to claim 6, characterized in that: The reflux assembly (5) is provided with a first feed inlet (503), a second feed inlet (504) and a third feed inlet (505), which are respectively connected to the anaerobic tank, the anoxic tank and the aerobic tank; a third guide plate (508), a second guide plate (507) and a first guide plate (506) are installed at the first feed inlet (503), the second feed inlet (504) and the third feed inlet (505); the second guide plate (507) is set at half height and is used to divert the supernatant above the sediment to the anoxic tank, and the third guide plate (508) is used to guide the reflux sediment to the anaerobic tank.

8. The water treatment denitrification and phosphorus removal equipment according to claim 1, characterized in that: An upper baffle (108) and a lower baffle (114) are provided between the second end plate (110) and the second baffle (111); the two ends of the upper baffle (108) are connected to the second end plate (110) and the second baffle (111) through upwardly inclined guide plates, and the two ends of the lower baffle (114) are connected to the second end plate (110) and the second baffle (111) through downwardly inclined guide plates, and slots (115) are provided at both ends of the lower baffle (114); a flexible rubber plate (109) is provided on the upper baffle (108) to buffer the water flow, prolong the water flow residence time in the aerobic tank, and can automatically adjust the curvature according to the water pressure to regulate the flow rate.

9. The water treatment denitrification and phosphorus removal equipment according to claim 1, characterized in that: The driving component is a motor (105), which is fixedly installed on the first end plate (113). The output end is connected to the transmission shaft (301) to drive the transmission assembly (3) to move as a whole.

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