Vertical flow biological induced phosphorus removal system and phosphorus removal process

Abstract

This invention relates to a vertical flow biological induced phosphorus removal system and process, comprising: a reactor body, with an inner cylinder and an outer cylinder forming inner and outer reaction chambers; a flow guiding device connected to the axial bottom end of the inner cylinder; an aeration device installed inside the flow guiding device for upward aeration; and a phosphorus removal agent dosing device for simultaneously adding phosphorus removal agent while crushing particles below the flow guiding device. By adding a phosphorus removal agent dosing device, large-diameter anaerobic ammonia oxidation particles are crushed while phosphorus removal agent is added. The alkaline environment created by hydroxide ions generated in the anaerobic ammonia oxidation reaction allows microorganisms to synergistically promote the phosphorus removal pathway, enhance the biologically induced crystallization reaction, and promote the crystallization reaction between excess calcium and magnesium ions and phosphate ions in wastewater, converting free phosphate ions into phosphorus-containing precipitates. This not only achieves phosphorus removal and phosphorus resource recovery but also reduces the amount of alkaline agent required for phosphorus removal, resulting in considerable economic benefits.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and particularly relates to a vertical flow biological induced phosphorus removal system and phosphorus removal process. Background Technology

[0002] Excessive nitrogen and phosphorus content in water bodies can easily induce eutrophication, causing significant damage to the environmental ecosystem. Currently operational biological nitrogen removal processes still result in excessive total phosphorus concentrations in the effluent, and phosphorus resources are difficult to recover and reuse, leading to phosphorus waste. In traditional biological phosphorus removal methods, polyphosphate-accumulating organisms (PAOs) are key microorganisms; however, PAOs have long cultivation cycles, and glucan-producing bacteria (GAOs) coexist with PAOs and consume their reaction substrates (organic carbon sources), affecting phosphorus removal efficiency, increasing treatment costs, and lacking effective control measures. Therefore, a novel biological nitrogen removal technology is urgently needed for efficient nitrogen and phosphorus removal.

[0003] In recent years, partial nitrification anaerobic ammonium oxidation (pH / A) has emerged as a novel, energy-efficient, and highly effective biological nitrogen removal technology. Hydroxyapatite (HAP) induced crystallization technology requires excess calcium and phosphorus ions in the solution to react in an alkaline environment to generate HAP crystals. Anaerobic ammonium oxidation can provide suitable pH conditions for HAP induced crystallization and promote the formation of a microbial-induced crystallization phosphorus removal pathway. Furthermore, HAP crystallization and pH / A granular sludge form a novel pH / A-HAP composite particle with HAP crystals at the core, anaerobic ammonium oxidizing bacteria (AnAOB) in the middle layer, and ammonia oxidizing bacteria (AOB) on the outer layer, accelerating the sludge granulation process. Existing research demonstrates that the single-stage pH / A-HAP process has the potential for highly efficient simultaneous nitrogen and phosphorus removal, and performs nitrogen and phosphorus removal within the same space, significantly reducing operating costs while maintaining high removal efficiency.

[0004] However, the practical application of this technology is still subject to several limitations. In traditional reactors, the effluent contains a large amount of calcium ions, resulting in resource waste; there is a lack of effective control methods to achieve continuous and stable nitrogen and phosphorus removal efficiency while reducing the waste of inorganic calcium. In addition, traditional biological nitrogen and phosphorus removal processes require large land areas, have complex processes, and are difficult to manage and refine indicators. There is a lack of low-cost and easy-to-operate phosphorus removal devices; biological nitrogen and phosphorus removal processes have long start-up cycles, and the accumulation of functional microorganisms is slow, making it difficult to achieve efficient and simultaneous nitrogen and phosphorus removal effects.

[0005] Therefore, how to provide a vertical flow biological induced phosphorus removal system, especially for phosphorus-containing wastewater, to achieve efficient and simultaneous nitrogen and phosphorus removal in the same space, and to improve the substrate mass transfer efficiency required for microbial-induced phosphorus crystallization, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To solve at least one of the above-mentioned technical problems, the present invention provides a vertical flow biological induced phosphorus removal system, comprising: a reactor body, a flow guiding device, an aeration device, and a phosphorus removal agent dosing device;

[0007] The reactor body includes nested inner and outer cylinders, forming inner and outer reaction chambers;

[0008] A flow guiding device is connected to the axial bottom end of the inner cylinder;

[0009] The aeration device is installed inside the flow guiding device to aerate upwards.

[0010] The phosphorus removal agent dosing device is used to add phosphorus removal agent while crushing particles below the flow guide device.

[0011] Furthermore, the phosphorus removal agent dosing device includes: a crushing component and a dosing component;

[0012] The crushing component, with its upper end connected to the lower end of the flow guiding device, is used to shear large-diameter sludge particles.

[0013] The dosing port of the dosing component is spaced around the crushing component.

[0014] Furthermore, the phosphorus removal agent dosing device also includes:

[0015] The monitoring component is located below the flow guide device and is used to monitor the operating indicators below the flow guide device.

[0016] The control component, connected to the monitoring component, crushing component, and dosing component, is used to control the crushing and dosing process based on operating parameters.

[0017] Furthermore, monitoring components are used to acquire phosphorus concentration, particle size distribution, and pH value in real time;

[0018] The control component synchronously acquires real-time particle size distribution and pH value when the phosphorus concentration exceeds the set range;

[0019] If the particle size distribution and pH value are within the set range, add calcium and magnesium reagent directly; if the particle size distribution is not within the set range, start the crushing component first to crush the particles to the set range before adding calcium and magnesium reagent; if the pH value is not within the set range, add alkaline reagent first to adjust the pH value to the set range before adding calcium and magnesium reagent.

[0020] Furthermore, the crushing assembly includes: a frame, a blade, a crushing drive, and a crushing spindle;

[0021] The frame is hollow inside, with the top of the side wall and the bottom of the flow guiding device sealed and connected, and a through hole is provided in the center.

[0022] The blade is located below the bottom of the frame; the crushing drive assembly is located above the bottom of the frame.

[0023] The crushing spindle is set inside the through hole, with its upper end connected to the crushing drive assembly and its lower end connected to the blade; the crushing drive assembly drives the blade to rotate through the crushing spindle.

[0024] Furthermore, the crushing drive assembly is located above the bottom end of the housing; the slurry blade is located below the bottom end of the housing; and the crushing spindle is located inside the through hole, with its upper end connected to the crushing drive assembly and its lower end connected to the slurry blade.

[0025] The blade is wider at the top and narrower at the bottom, with blades on the upper and outer sides and a guide groove on the inner side.

[0026] Furthermore, the dosing assembly includes: a dosing outlet and a feeding pipe;

[0027] The discharge ports are spaced around the crushing components and connected to the outlet of the feed pipe;

[0028] The first branch of the feed pipe inlet is connected to the calcium and magnesium reagent tank and is equipped with a calcium and magnesium transfer pump; the second branch of the feed pipe inlet is connected to the alkaline reagent tank and is equipped with an alkaline transfer pump.

[0029] Furthermore, the dosing assembly includes:

[0030] The control assembly includes a dosing drive; and a first dosing valve and a second dosing valve connected to the dosing drive and the feed pipe; the first dosing valve is disposed on a first branch of the feed pipe; the second dosing valve is disposed on a second branch of the feed pipe.

[0031] The dosing drive unit, connected to the monitoring component, is used to control the first dosing valve to adjust the calcium and magnesium dosage and the second dosing valve to adjust the alkaline agent dosage according to the operating indicators.

[0032] Furthermore, the flow guiding device includes: a first inner inclined flow guiding section, a first outer inclined flow guiding section, a second inner inclined flow guiding section, and a second outer inclined flow guiding section connected end to end in sequence;

[0033] The first and second inclined guide sections are respectively provided with a first sieve hole and a second sieve hole, and the diameter of the first sieve hole is smaller than the diameter of the second sieve hole.

[0034] The aeration device is located at the second external inclined guide section;

[0035] The phosphorus removal agent dosing device is located below the second outer inclined guide section and is used to add enhanced phosphorus removal agent.

[0036] On the other hand, the present invention also provides a phosphorus removal process, employing any of the above-mentioned vertical flow biological-induced phosphorus removal systems, the steps of which include:

[0037] First, the wastewater enters the vertical flow biological induced phosphorus removal system;

[0038] Next, the aeration device starts aeration, and the wastewater in the vertical flow biological induced phosphorus removal system forms a flow field. The flocculent sludge, small-diameter granular sludge and large-diameter granular sludge in the wastewater form a granular sludge system.

[0039] Then, the phosphorus removal agent is added while the particles are being crushed by the phosphorus removal agent dosing device to remove pollutants from the wastewater;

[0040] Finally, the treated wastewater is discharged into a sedimentation tank for settling, awaiting further treatment.

[0041] This invention provides a vertical flow biological-induced phosphorus removal system and process. The key features include: an added phosphorus removal agent dosing device that simultaneously crushes large-diameter anaerobic ammonia oxidation particles and adds the phosphorus removal agent. Utilizing the alkaline environment created by the hydroxide ions generated in the anaerobic ammonia oxidation reaction, microorganisms synergistically promote the phosphorus removal pathway, enhance the biologically induced crystallization reaction, and promote the crystallization reaction between excess calcium and magnesium ions and phosphate ions in the wastewater. This converts free phosphate ions into phosphorus-containing precipitates, achieving not only phosphorus removal and phosphorus resource recovery but also reducing the amount of alkaline agent required for phosphorus removal, resulting in significant economic benefits. This single-stage reaction device can simultaneously denitrify and remove phosphorus in the same space, greatly reducing land area and operational complexity. The combination of crushing and targeted quantitative dosing of the phosphorus removal agent promotes the binding degree of calcium and magnesium ions with phosphate ions, increasing the rate of induced crystallization. Furthermore, by increasing the enrichment of functional bacteria in the wastewater treatment system, the microbial-induced crystallization pathway is enhanced, thereby reducing the phosphorus content in the treated wastewater and achieving phosphorus removal. By promoting bio-induced simultaneous phosphorus removal, efficient phosphorus resource recovery and reuse can be achieved. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort. In the drawings, the same parts use the same reference numerals. The drawings are not drawn to scale.

[0043] Figure 1 This is a schematic diagram of a structural embodiment of a vertical flow biological-induced phosphorus removal system according to the present invention;

[0044] Figure 2 This is a partial structural schematic diagram of a phosphorus removal agent dosing device for a vertical flow biological induced phosphorus removal system according to an embodiment of the present invention;

[0045] Figure 3 for Figure 2 A magnified view of a portion at point A;

[0046] Figure 4 This is a schematic diagram of an embodiment of a vertical flow biological-induced phosphorus removal system according to the present invention. Detailed Implementation

[0047] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0048] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component present. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intervening component present.

[0049] It should also be noted that if the embodiments of the present invention involve directional indications, such as up, down, left, right, front, back, etc., these directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. Furthermore, if the embodiments of the present invention involve descriptions such as "first," "second," "S1," "S2," "step one," "step two," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance, or implicitly indicating the number of technical features indicated or the order of method execution. Those skilled in the art will understand that anything that does not violate the inventive concept and does not contradict the inventive points should be included within the scope of protection of the present invention.

[0050] This invention provides a vertical flow biological-induced phosphorus removal system, referenced Figure 1 It includes: the reactor body, the flow guiding device, and the phosphorus removal agent dosing device;

[0051] The reactor body includes nested inner cylinder 1 and outer cylinder 2, forming inner and outer reaction chambers;

[0052] The flow guiding device 3 is connected to the axial bottom end of the inner cylinder;

[0053] Aeration device 4 is installed inside the flow guiding device to aerate upwards;

[0054] The phosphorus removal agent dosing device 5 is used to add phosphorus removal agent while crushing the particles below the flow guide device.

[0055] Example: The reactor body includes an inner cylinder and an outer cylinder, which are nested and connected, dividing it into an inner reaction chamber 11 located inside the inner cylinder and an outer reaction chamber 12 located between the inner and outer cylinders. The flow guiding device may optionally include: an inner inclined flow guiding section 31 disposed at the top, an outer inclined flow guiding section 32 disposed at the bottom, sieve holes disposed on the sidewall of the inner inclined flow guiding section, and through holes 34 disposed within the flow guiding device; the aperture of the sieve holes is smaller than the aperture of the through holes; more preferably, the flow guiding device is a multi-stage, multi-layer flow guiding device—the inner inclined flow guiding section 31 includes a first inner inclined flow guiding section 31a and a second inner inclined flow guiding section 31b; the outer inclined flow guiding section 32 includes a first outer inclined flow guiding section 32a and a second outer inclined flow guiding section 32b; the sieve holes include a first sieve hole 33a disposed on the first inner inclined flow guiding section and a second sieve hole 33b disposed on the second inner inclined flow guiding section, the aperture of the second sieve hole being larger than the aperture of the first sieve hole. The aeration device can optionally be connected to an external air pump to continuously deliver gas; preferably, the aeration rate is stably controlled by a rotor flow meter and digital display device, and can be adjusted within a suitable range (0~30 Lgas / Lliquid). It is worth noting that the specific structure of the reactor body, the flow guiding device, and the aeration device is not specifically limited; the key to this invention is the addition of a phosphorus removal agent dosing device, which adds the phosphorus removal agent while crushing particles below the flow guiding device. The specific working principle and technical effects are explained based on the above examples, but are not limited thereto.

[0056] During wastewater treatment, the aeration device, through aeration, mixes the sludge and wastewater evenly inside the reactor. This creates an upward flow velocity within the internal flow field, propelling the mixture upwards. This results in an upward flow within the through-holes and inner reaction chamber, and a downward flow within the outer reaction chamber between the inner and outer cylinders. Simultaneously, a micro-aerobic zone is formed within the upper inner reaction chamber. Under the influence of the upward flow, the clarified liquid, flocculent sludge, and small-diameter granular sludge in the mixture enter the internal circulation along the inner reaction chamber, the outer reaction chamber between the inner and outer cylinders, and the sieve holes, completing the first circulation trajectory. Meanwhile, aerobic microorganisms attached to the flocculent sludge and small-diameter granular sludge consume dissolved oxygen in the aforementioned inner reaction chamber in the micro-aerobic zone, carrying out metabolic activities and continuously enriching the microorganisms. On the other hand, due to the weak aeration effect in the outer cylinder area and the limited dissolved oxygen supplied from the outside, an anaerobic zone is formed between the outer inclined guide section and the outer cylinder. In this anaerobic zone, flocculent sludge and small-diameter granular sludge undergo anaerobic reactions and adsorb onto each other to form large-diameter granular sludge. The large-diameter granular sludge flows along the inner and outer reaction chambers and is then intercepted by the sieve holes. It can only continue to flow downwards along the outer reaction chamber between the outer inclined guide section and the outer cylinder. Driven by the upward flow, it passes through the through holes and re-enters the inner circulation, completing the second circulation trajectory. Furthermore, the formation of an anaerobic zone between the outer inclined guide section and the outer cylinder is conducive to promoting the anaerobic ammonia oxidation reaction of the large-diameter anaerobic ammonia oxidation granular sludge, promoting microbial metabolism, thereby achieving the enrichment of anaerobic ammonia oxidizing bacteria and sludge granulation.

[0057] In the above reaction process, since anaerobic ammonium oxidation is the main denitrification pathway, it cannot achieve ideal phosphorus removal. The key to this invention is the addition of a phosphorus removal agent dosing device. This device crushes the large-diameter anaerobic ammonium oxidation particles below the flow guide while simultaneously adding the phosphorus removal agent. Utilizing the alkaline environment created by the hydroxide ions generated in the anaerobic ammonium oxidation reaction, microorganisms synergistically promote the phosphorus removal pathway, enhance the bio-induced crystallization reaction, and promote the crystallization reaction between excess calcium and magnesium ions and phosphate ions in the wastewater. This converts free phosphate ions into phosphorus-containing precipitates, achieving not only phosphorus removal and phosphorus resource recovery but also reducing the amount of alkaline agent required for phosphorus removal, resulting in considerable economic benefits. This single-stage reactor enables simultaneous nitrogen and phosphorus removal within the same space, significantly reducing land area required and operational complexity. Crushing is combined with targeted, quantitative dosing of phosphorus removal agents to promote the binding of calcium and magnesium ions with phosphate ions, increasing the induced crystallization rate. Furthermore, by enhancing the enrichment of functional bacteria within the wastewater treatment system, the microbial-induced crystallization pathway is strengthened, thereby reducing the phosphorus content in the treated wastewater and achieving phosphorus removal. By promoting simultaneous biological-induced phosphorus removal, efficient phosphorus resource recovery and reuse are achieved.

[0058] The discovery and solution to this technical problem, particularly the following key technical concepts, are: 1. The aeration position is located within the flow guiding device, and the crushing device is located below the flow guiding device, also below the aeration position; 2. Chemical addition is performed simultaneously with crushing, i.e., a combination of crushing and chemical addition. Specifically, by placing the crushing device below the aeration device, the large-diameter particles that are blocked by the screen holes but enter the internal circulation through the through-holes are crushed, allowing them to have a larger surface area to fully react with the phosphorus removal agent. Driven by the upward flow, they slowly rise, extending the reaction time of this part and greatly improving the phosphorus removal effect during the anaerobic ammonia oxidation reaction in this stage. This is especially effective for phosphorus-containing wastewater with an influent total phosphorus concentration of 10~100 mg / L.

[0059] This is mainly because: 1. The anaerobic ammonium oxidation reaction in the external inclined guide section produces a large number of hydroxide ions, causing a local pH increase and an increase in the particle size of the granular sludge. This sludge moves further downwards, and with the addition of phosphorus removal agents, the reaction with calcium and magnesium ions is enhanced in the local pH-increased / alkaline environment, forming crystalline substances such as HAP and MAP encapsulated inside the granular sludge. This strengthens the conversion of dissolved phosphorus into solid phosphorus, fixing it inside the granular sludge (where the internal pH is higher), making it easier to remove phosphorus from the reactor through sludge discharge or particle removal; 2. The increased particle size of the granular sludge, exceeding a certain threshold, leads to aging of the granular sludge, reducing the number of attached active functional bacteria and decreasing the effectiveness of anaerobic ammonium oxidation and autogenous denitrification. To maintain a suitable particle size range (2-5mm), excessively large particles should be broken up to expose / remove the encapsulated crystalline substances (inorganic matter) such as HAP and MAP. Therefore, crushing is necessary here—the crushed biological components and microbial parts will continue to circulate, forming new granular sludge, thus replacing the aging granular sludge. 3. After crushing, the internal space is exposed, allowing the added phosphorus removal agent to fully contact the middle part of the granules, further promoting the HAP and MAP reaction processes to a certain extent.

[0060] In summary, this invention provides a vertical flow biologically induced phosphorus removal system that combines crushing and chemical dosing. The system crushes particles below the flow guide device while simultaneously adding chemicals, promoting simultaneous biological phosphorus removal and achieving efficient phosphorus resource recovery and reuse, thus reducing the phosphorus content in the treated wastewater. Specifically, it enables efficient simultaneous nitrogen and phosphorus removal in the same space for phosphorus-containing wastewater, and improves the substrate mass transfer efficiency required for microbial-induced phosphorus crystallization.

[0061] Preferred, Reference Figures 1-3 The phosphorus removal agent dosing device 5 includes: a crushing component 51 and a dosing component 52;

[0062] The crushing component, with its upper end connected to the lower end of the flow guiding device, is used to shear large-diameter sludge particles.

[0063] The dosing component's outlet 521 is spaced around the crushing component.

[0064] More preferably, the phosphorus removal agent dosing device 5 further includes: a monitoring component 53 and a control component 54;

[0065] The monitoring component is located below the flow guide device and is used to monitor the operating indicators below the flow guide device.

[0066] The control component, connected to the monitoring component, crushing component, and dosing component, is used to control the crushing and dosing process based on operating parameters.

[0067] In this embodiment, the crushing component is connected at its upper end to the bottom of the flow guiding device, and is used to shear large-diameter granular sludge particles blocked by the screen holes; the large-diameter granular sludge particles are sheared into granular sludge particles of suitable size, exposing more surface area, completing the renewal of granular sludge, and avoiding aging of granular sludge. In the sheared granular sludge particles, the less dense part continues to move upward to participate in the internal circulation, while the denser part (mainly inorganic particles or inorganic agglomerates in the particles) sinks downward, separating the inorganic particles and inorganic agglomerates, and exposing them on the surface of the granular sludge.

[0068] More preferably, the monitoring component located below the flow guide device can monitor the system's operating parameters in real time. Optionally, the monitoring component includes a dissolved oxygen sensor, an ammonia nitrogen sensor, a pH sensor, and / or other sensors to monitor operating parameters such as dissolved oxygen concentration, ammonia nitrogen concentration, and pH value within the reactor in real time, enabling timely understanding of the system status and precise control. Based on the operating parameters collected by the monitoring component, the start / stop of the crushing component and the dosage and timing of the chemical dosing component are automatically adjusted. Simultaneously with crushing, the dosage of phosphorus removal agents is precisely controlled to adapt to phosphorus removal requirements under different operating conditions, ensuring reaction efficiency and reducing operating costs.

[0069] If the reaction indicators indicate that chemical dosing is required, the dosing assembly has outlets spaced around the outside of the crushing assembly. These outlets can evenly distribute the phosphorus removal agent around the crushing assembly, allowing the agent to quickly and fully contact the renewed granular sludge (mainly inorganic particles or inorganic agglomerates within the particles). This achieves targeted and quantitative phosphorus removal agent dosing, ensuring that the phosphorus removal agent fully reacts with the large particles sheared at the bottom of the diversion device, thereby improving the phosphorus removal efficiency.

[0070] More preferably, refer to Figure 4 The crushing assembly includes: a frame 511, a blade 512, a crushing drive 513, and a crushing spindle 514;

[0071] The frame is hollow inside, with the top of the side wall and the bottom of the flow guiding device sealed and connected, and a through hole is provided in the center.

[0072] The blade is located below the bottom of the frame; the crushing drive assembly is located above the bottom of the frame.

[0073] The crushing spindle is set inside the through hole, with its upper end connected to the crushing drive assembly and its lower end connected to the blade; the crushing drive assembly drives the blade to rotate through the crushing spindle.

[0074] In this embodiment, the shell frame forms an outer enclosure structure that is hollow inside and closed outside, and is connected to the bottom end of the flow guiding device to divide the space at the bottom of the outer cylinder into inner and outer regions. The outer region is mainly composed of large-diameter sludge particles, while the inner region is a water flow carrying large-diameter sludge particles. Small-diameter sludge particles move upward and directly enter the inner circulation. Large-diameter sludge particles, due to their slightly higher density than water, flow downward along the closed side and reach the bottom of the shell frame. At this point, the large-diameter granular sludge is sheared into granular sludge of suitable size by the rotating blades below the shell, exposing more surface area and completing the renewal of the granular sludge. On the one hand, through the rotating shearing of the blades and density differences, inorganic particles and inorganic agglomerates are separated, achieving sieving, shearing, and renewal of the granular sludge, effectively controlling the particle size and sludge age, avoiding the accumulation of aged particles, and maintaining system activity. On the other hand, the large area of ​​exposed inorganic matter, with the inlet pipe and outlet arranged at this location, enables the simultaneous addition of phosphorus removal agents at multiple points, highly matching the flow path of the granular sludge, fully realizing biologically induced synchronous phosphorus removal, and maximizing the utilization efficiency and reaction effect of the agents at this location. It is worth noting that the placement of the blades and crushing drive components is not a conventional technical choice, but rather a practically effective one. 1. The blade is located below the bottom of the shell frame, which can quickly and promptly shear large particles to prevent them from entering the shell frame and occupying unnecessary space. 2. The crushing drive assembly is located above the bottom of the shell frame, which can prevent the obstruction of the upward flow of small sludge particles and prevent the accumulation of small particles that need to be sheared, thus avoiding blockage.

[0075] More preferably, refer to Figure 4 The blade is wider at the top and narrower at the bottom, with blades on the upper and outer sides and a guide groove 515 on the inner side.

[0076] In this embodiment, further detailed improvements to the slurry cutter are defined as follows: 1. The slurry cutter is wider at the top and narrower at the bottom, forming a swirling flow that further propels the wastewater upwards. Together with the aeration device, this accelerates the upward flow and prevents granular sludge from accumulating at the bottom of the outer cylinder. 2. Cutting edges are provided on the upper and outer sides of the slurry cutter, creating bidirectional shearing force in both the transverse and longitudinal directions. This cuts large-diameter aged granular sludge particles, and even small air bubbles, effectively achieving the self-renewal of the granular sludge. Simultaneously, it agitates the phosphorus removal agent, ensuring more thorough contact between the agent and the granular sludge. 3. A guide channel is provided on the inner side of the slurry cutter, forming a gradually narrowing shearing space. When sludge particles enter the wider area of ​​the slurry cutter, they undergo initial shearing. Function: As particles move downwards and gradually enter a narrow area, the shear strength gradually increases, effectively breaking down large-diameter sludge particles. At this point, the inner guide channel guides the sludge particles towards the shearing surface of the slurry blade, causing large sludge particles to concentrate in the shearing area, improving shearing efficiency and flow uniformity. Meanwhile, small- and medium-diameter sludge particles are trapped in the guide channel (2-5mm), preventing them from being further sheared into smaller particles. Therefore, the particles here are sheared to a fixed, suitable size, avoiding both excessively large particles that meet the requirement of large-area inorganic matter exposure and excessively small particles that move rapidly upwards with the rising flow without sufficient reaction time, especially hindering the reaction and renewal with the phosphorus removal agent. Therefore, the inner guide channel is crucial; fixing a suitable particle size allows the particles to be guided to the outer edge of the outlet under the action of the guide channel and centrifugal force, enabling faster and more convenient contact with the phosphorus removal agent and achieving a more complete phosphorus removal reaction.

[0077] Preferred, Reference Figure 1 The lower end of the outer cylinder is an inclined conical cylinder; the frame is a hollow frustum that gradually narrows from top to bottom;

[0078] The side of the frame has the same inclination angle as the bottom of the outer cylinder.

[0079] In this embodiment, the lower end of the outer cylinder is a tapered cone. This structural design guides large-diameter granular sludge to gradually flow and accumulate naturally at the bottom, facilitating subsequent particle recovery and discharge. The bottom of the outer cylinder maintains the same angle as the shell frame, forming an inclined and continuous pre-set flow path, reducing jamming and accumulation at narrow points due to inconsistent angles during granular sludge movement. Furthermore, the sludge particles move along the inclined pre-set flow path, forming an inclined guiding structure, which helps guide large-diameter granular sludge to slide downwards along the sidewall, improving the separation efficiency of large-diameter granular sludge.

[0080] For example, the bottom of the outer cylinder is at the same angle as the shell frame, and the distance between the bottom of the outer cylinder and the shell frame is 30~50mm. This makes the distance between the bottom of the outer cylinder and the shell frame reasonable, so that large-diameter sludge particles can be accurately guided to the crushing and phosphorus removal area and be sheared by the slurry blades; while small-diameter particles can enter the internal circulation with the upward flow, improving the classification accuracy and efficiency.

[0081] Preferably, the phosphorus removal agents may include: calcium-magnesium agents, such as calcium chloride and magnesium sulfate as core phosphorus removal agents, which remove phosphorus by generating calcium phosphate and magnesium phosphate precipitates; and alkaline agents, such as sodium hydroxide and sodium carbonate, which adjust the pH to 7.5-8.5, optimize the precipitation efficiency of calcium and magnesium phosphate, and simultaneously assist in sludge particle coagulation to prevent the loss of fine particles. Specifically, the hydroxide ions generated by the anaerobic ammonium oxidation reaction, on the one hand, synergize with the added alkaline agents to adjust the pH of the solution, making the overall internal pH environment alkaline; on the other hand, synergize with the added calcium-magnesium agents to react with phosphates in an alkaline environment to generate insoluble calcium and magnesium phosphate crystals, effectively reducing the soluble phosphorus in the solution. Preferably, taking calcium-magnesium agents as calcium compounds and alkaline agents as hydroxide or bicarbonate ions as examples, the mass ratio of Ca2+ / P is greater than 2.0 and less than 6.0; the molar ratio of Ca2+ / OH- or Ca2+ / HCO3- is greater than 0.3 and less than 3. More preferably, the addition method is to prepare a mixed solution and inject it simultaneously, adding the agent intermittently to achieve an appropriate dosage and optimize the reaction process. Even more preferably, the phosphorus removal agent also includes: a polymeric compound and / or a biological inhibitor. The polymeric compound and the biological inhibitor are used to assist in regulating the crystallization reaction, sludge granulation, and biochemical reaction rate, further improving the biological phosphorus removal effect.

[0082] More preferably, refer to Figure 1 and Figure 2 To adapt to the above dosing process, the dosing component 52 includes: a dosing outlet 521 and a feed pipe 522;

[0083] The discharge ports are spaced around the crushing components and connected to the outlet of the feed pipe;

[0084] The first branch of the feed pipe inlet is connected to the calcium and magnesium reagent tank 211 and is equipped with a calcium and magnesium transfer pump 221; the second branch of the feed pipe inlet is connected to the alkaline reagent tank 212 and is equipped with an alkaline transfer pump 222.

[0085] In this embodiment, by setting up calcium and magnesium reagent tanks and alkaline reagent tanks, and configuring calcium and magnesium transfer pumps and alkaline transfer pumps at the first and second branches of the feed pipe respectively, the independent and precise addition of calcium and magnesium reagents and alkaline reagents can be achieved. The dosage and time of different reagents can be intelligently adjusted according to the monitored operating indicators to avoid mutual interference and improve the dosing accuracy and phosphorus removal efficiency.

[0086] Preferably, the monitoring component is used to acquire phosphorus concentration, particle size distribution, and pH value in real time;

[0087] The control component synchronously acquires real-time particle size distribution and pH value when the phosphorus concentration exceeds the set range;

[0088] If the particle size distribution and pH value are within the set range, add calcium and magnesium reagent directly; if the particle size distribution is not within the set range, start the crushing component first to crush the particles to the set range before adding calcium and magnesium reagent; if the pH value is not within the set range, add alkaline reagent first to adjust the pH value to the set range before adding calcium and magnesium reagent.

[0089] This embodiment presents a preferred embodiment of the monitoring and control components, initiating a phosphorus concentration priority criterion and a phosphorus removal agent dosing method that coordinates particle size and pH. This is the core of the invention: simultaneous phosphorus removal during crushing to achieve highly efficient phosphorus removal. Example:

[0090] Phosphorus concentration priority criterion: Real-time monitoring by an online phosphorus sensor; when the phosphorus concentration is >2 mg / L, particle size and pH detection are triggered.

[0091] Particle size matching conditions: Phosphorus removal agents are only permitted to be added when D50 (median particle size) is between 0.15 and 0.3 cm (the particle specific surface area is moderate, which is conducive to agent adsorption and precipitation adhesion); if D50 > 0.3 cm, the crushing component should be started first, and the agent should be added after the particle size drops to the target range; if D50 < 0.15 cm, the addition should be suspended, because fine particles easily adsorb the agent, resulting in waste, and precipitation separation is difficult. The phosphorus removal agent should be added after the particles grow to a suitable size.

[0092] pH adjustment linkage: If the phosphorus concentration is >2mg / L and D50 is within the target range, but the pH is ≤7.5, first add alkaline agents to adjust the pH to 7.5~8.0, and then start the calcium and magnesium agent addition.

[0093] More specifically: when the average particle size of sludge particles is greater than 0.3 cm, the crushing component is turned on; when the average particle size of sludge particles is less than 0.15 cm, the crushing component is turned off; when the phosphorus concentration in the wastewater is greater than 2 mg / L, the phosphorus removal agent is started. More preferably, when the average particle size of sludge particles is 0.15~0.3 cm, red in color, and the pH is greater than 7.5, the phosphorus removal agent is started; when the average particle size of sludge particles is less than 0.15 cm, the red color is not obvious, and the pH is less than 7.5, the phosphorus removal agent is stopped.

[0094] More preferably, refer to Figure 2The control component 54 includes a dosing drive 541; and a first dosing valve 542 and a second dosing valve 543 connected to the dosing drive and the feed pipe; the first dosing valve is disposed on a first branch of the feed pipe; the second dosing valve is disposed on a second branch of the feed pipe 522.

[0095] The dosing drive unit, connected to the monitoring component, is used to control the first dosing valve to adjust the calcium and magnesium dosage and the second dosing valve to adjust the alkaline agent dosage according to the operating indicators.

[0096] In this embodiment, the control component includes a dosing actuator, a first dosing valve, and a second dosing valve. The first dosing valve is located on the first branch of the inlet pipe (for calcium and magnesium reagent dosing), and the second dosing valve is located on the second branch of the inlet pipe (for alkaline reagent dosing). This allows the dosing actuator to precisely control the dosage and timing of calcium and magnesium reagents and alkaline reagents based on the operating indicators detected by the monitoring component (such as dissolved oxygen, ammonia nitrogen, and pH value). This enables precise dosing of calcium and magnesium reagents and alkaline reagents as needed, allowing chemical phosphorus removal and pH adjustment to work synergistically, rapidly forming a precipitation reaction and promoting granulation, thereby improving the reaction rate and phosphorus removal efficiency. Because the dosing actuator can intelligently adjust the dosage according to actual needs, it can meet the reaction requirements while avoiding overdosing that may occur under a fixed flow rate dosing mode. This saves on the amount of calcium and magnesium reagents and alkaline reagents used, reducing overall reagent costs and the burden of subsequent sludge treatment. For example, when the monitoring component detects that the pH is below a set threshold, the dosing actuator opens the second dosing valve to add an alkaline agent in order to maintain the pH within a predetermined range.

[0097] More preferably, the determination of the dosage of calcium and magnesium reagents and the dosage of alkaline reagents may include:

[0098] Based on the wastewater flow rate Q (m³ / h), phosphorus difference ΔCP (the difference between the monitored phosphorus concentration (mg / L) and the target phosphorus concentration), and calcium-magnesium reagent dosage coefficient K1 (based on stoichiometry, removing 1 mg / L of phosphorus requires the addition of 8~10 mg / L of calcium and magnesium ions; in this example, K1=9), determine the basic dosage of calcium-magnesium reagent. Then, based on this basic dosage, proportionally match the basic dosage of alkaline reagent. For example: the alkaline reagent dosage is matched to the calcium-magnesium reagent dosage in the following proportion: Alkaline (adjusted according to the raw water pH: 0.5 for raw water pH = 7.0~7.5; 0.3 for raw water pH = 7.5~8.0).

[0099] Based on particle size and pH, determine the particle size correction factor K2 and pH correction factor K3, and then correct to obtain the final dosage of calcium and magnesium reagents and the dosage of alkaline reagents.

[0100] Example:

[0101] Dosage of calcium and magnesium reagent MCa / Mg =Q×ΔCP×K1×K2×K3 (kg / h)

[0102] Particle size correction factor: When D50 is in the range of 0.15~0.3cm, K2=0.8-1.2. The larger D50 is, the larger K2 is; because larger particles require more agent to cover the surface.

[0103] pH correction factor: When pH=7.5~8.5, K3=1.0; for every 0.1 decrease in pH, K3 increases, such as an increase of 5%; because precipitation efficiency decreases under acidic conditions;

[0104] More specifically: When the phosphorus concentration is >5 mg / L (high phosphorus load): K1 is increased, such as to 11 (10% overdosing), while the D50 control range is reduced to 0.2~0.3 cm (larger particles facilitate rapid precipitation).

[0105] When D10 > 0.1cm (particles are relatively coarse): increase K2. For example, if it is increased to 1.3, increase the dosage of the reagent to ensure that the particle surface reacts fully.

[0106] When D90 < 0.2 cm (particles are too fine): K2 is reduced, such as to 0.7, to reduce reagent waste. At the same time, the proportion of alkaline reagent (alkali) is appropriately increased to promote the coagulation of fine particles.

[0107] Preferred, Reference Figure 1 The flow guiding device includes: a first inner inclined flow guiding section, a first outer inclined flow guiding section, a second inner inclined flow guiding section, and a second outer inclined flow guiding section connected in sequence from end to end;

[0108] The first and second inclined guide sections are respectively provided with a first sieve hole and a second sieve hole, and the diameter of the first sieve hole is smaller than the diameter of the second sieve hole.

[0109] The aeration device is located at the second external inclined guide section;

[0110] The phosphorus removal agent dosing device is located below the second outer inclined guide section and is used to add enhanced phosphorus removal agent.

[0111] In this embodiment, a preferred embodiment of the flow guiding device is provided. Under the action of an upward flow, the clarified liquid, flocculent sludge, and small-diameter granular sludge in the wastewater are sequentially screened according to particle size along the inner reaction chamber and the outer reaction chamber between the inner and outer cylinders, flowing into the first and second screen openings respectively. Since the first screen opening is above the second screen opening, and the aperture of the second screen opening is larger than that of the first screen opening, the smaller granular sludge circulates through the inner reaction chamber, the outer reaction chamber between the inner and outer cylinders, and the first screen opening, while the larger granular sludge circulates through the second screen opening. Because the smaller granular sludge has a shorter circulation path, it can grow into larger granular sludge more quickly, and then continue to circulate through the second screen opening, continuing to grow into large-diameter granular sludge, finally completing the second circulation trajectory. By setting the aperture size of the first and second screen openings, the first circulation trajectory is divided into a rapid growth path for smaller sludge and a deep circulation path for larger sludge, achieving graded control of the particle size gradient of the granular sludge within the reactor. Specifically, the first screen, located above the second screen and with a smaller aperture, primarily targets the initially formed small-diameter granular sludge, promoting its rapid circulation and aggregation. The second screen, also with a smaller aperture, mainly filters medium to large-diameter granular sludge, allowing it to enter deeper circulation channels and further increase in size over a longer flow path, eventually growing into stable large-diameter granular sludge. This "small-to-large, graded progression" cyclical screening and growth mechanism not only improves the sludge granulation rate but also optimizes the particle size distribution of granular sludge within the reactor, facilitating the formation of a highly efficient and stable granular sludge system. This enhances the aerobic reaction in wastewater, improves the removal of organic pollutants, and further improves wastewater treatment efficiency and effluent quality. The phosphorus removal agent dosing device is located below the second external inclined guide section. It crushes large-diameter anaerobic ammonia oxidation particles while simultaneously adding phosphorus removal agents. The alkaline environment created by the hydroxide ions generated during anaerobic ammonia oxidation fosters microbial synergy, further enhancing the system's phosphorus removal efficiency.

[0112] A phosphorus removal process, employing any of the above-mentioned vertical flow biological-induced phosphorus removal systems, includes the following steps:

[0113] First, the wastewater enters through a wastewater buffer and then enters the vertical flow biological induced phosphorus removal system;

[0114] Next, the aeration device starts aeration, and the wastewater in the vertical flow biological induced phosphorus removal system forms a flow field. The flocculent sludge, small-diameter granular sludge and large-diameter granular sludge in the wastewater form a granular sludge system.

[0115] Then, the phosphorus removal agent is added while the particles are being crushed by the phosphorus removal agent dosing device to remove pollutants from the wastewater;

[0116] Finally, the treated wastewater is discharged into a sedimentation tank for settling, awaiting further treatment.

[0117] This embodiment presents a phosphorus removal process that, under the influence of a vertical flow field, promotes the formation of a stable granular sludge system from flocculent sludge, small-diameter granular sludge, and large-diameter granular sludge in wastewater. This improves the settling performance and granulation level of the sludge, facilitating the enrichment and capture of phosphorus in the wastewater. Simultaneously, the phosphorus removal agent is added during the granular sludge crushing process, ensuring sufficient contact between the agent and phosphorus pollutants in the wastewater. This enhances phosphorus removal efficiency, reduces agent dosage, and helps lower wastewater treatment operating costs. Furthermore, the multi-stage flow field disturbance and stratification characteristics of the vertical flow biological-induced phosphorus removal system enhance the activity of microorganisms within the sludge, improving biological phosphorus removal efficiency and achieving synergistic physical, chemical, and biological phosphorus removal, ensuring stable effluent quality that meets standards.

[0118] The aforementioned phosphorus removal process is based on the vertical flow biological-induced phosphorus removal system described above. Its technical effects and features are not elaborated further here. The above embodiments merely illustrate several implementation methods of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A vertical flow biological-induced phosphorus removal system, characterized in that, include: Reactor body, flow guiding device, aeration device, and phosphorus removal agent dosing device; The reactor body includes nested inner and outer cylinders, forming inner and outer reaction chambers; A flow guiding device is connected to the axial bottom end of the inner cylinder; The aeration device is installed inside the flow guiding device to aerate upwards. The phosphorus removal agent dosing device is used to add phosphorus removal agent while crushing particles below the flow guide device. It includes: crushing component, dosing component, monitoring component, and control component. The crushing component is connected to the bottom of the flow guide device at the top and is used to shear large-diameter sludge particles. The dosing component's outlet is spaced around the crushing component; the monitoring component, located below the flow guide device, is used to acquire phosphorus concentration, particle size distribution, and pH value in real time; the control component, connected to the monitoring component, crushing component, and dosing component, is used to simultaneously acquire real-time particle size distribution and pH value when the phosphorus concentration exceeds the set range; if the median particle size and pH value are within the set range, calcium and magnesium reagents are added directly; if the median particle size is larger than the set range, the crushing component is activated first to crush the particles to the set range before adding calcium and magnesium reagents; if the median particle size is smaller than the set range, the particles are allowed to grow to a suitable size before adding calcium and magnesium reagents; if the pH value is not within the set range, an alkaline reagent is added first to adjust the pH value to the set range before adding calcium and magnesium reagents.

2. The vertical flow biological-induced phosphorus removal system according to claim 1, characterized in that, A control component is used to trigger particle size and pH detection when the phosphorus concentration is >2 mg / L; The dosing assembly is triggered only when the median particle size D50 is between 0.15 and 0.3 cm, and calcium and magnesium reagents are added directly. If the median particle size D50 is greater than 0.3 cm, the crushing assembly is activated first, and the reagents are added after the particle size drops to between 0.15 and 0.3 cm. If the median particle size D50 is less than 0.15 cm, the dosing is paused, and the calcium and magnesium reagents are added only after the particles have grown to the median particle size. pH adjustment linkage: If the phosphorus concentration is >2mg / L and the D50 is within the target range, but the pH is ≤7.5, first add alkaline agents to adjust the pH to 7.5~8.0, and then start the calcium and magnesium agent addition.

3. The vertical flow biological-induced phosphorus removal system according to claim 1, characterized in that, The crushing assembly includes: a frame, a blade, a crushing drive unit, and a crushing spindle; The frame is hollow inside, with the top of the side wall and the bottom of the flow guiding device sealed and connected, and a through hole is provided in the center. The blade is located below the bottom of the frame; the crushing drive assembly is located above the bottom of the frame. The crushing spindle is set inside the through hole, with its upper end connected to the crushing drive assembly and its lower end connected to the blade; the crushing drive assembly drives the blade to rotate through the crushing spindle.

4. The vertical flow biological-induced phosphorus removal system according to claim 3, characterized in that, The slurry cutter is wider at the top and narrower at the bottom, with cutting edges on the upper and outer sides.

5. The vertical flow biological-induced phosphorus removal system according to claim 4, characterized in that, A flow guide groove is provided on the inside of the blade.

6. The vertical flow biological-induced phosphorus removal system according to claim 1, characterized in that, The lower end of the outer cylinder is an inclined conical cylinder; the frame is a hollow frustum that tapers from top to bottom; The side of the frame has the same inclination angle as the bottom of the outer cylinder.

7. The vertical flow biological-induced phosphorus removal system according to claim 1, characterized in that, The dosing assembly includes: a dosing outlet and a feed pipe; The discharge ports are spaced around the crushing components and connected to the outlet of the feed pipe; The first branch of the feed pipe inlet is connected to the calcium and magnesium reagent tank and is equipped with a calcium and magnesium transfer pump; the second branch of the feed pipe inlet is connected to the alkaline reagent tank and is equipped with an alkaline transfer pump.

8. The vertical flow biological-induced phosphorus removal system according to claim 7, characterized in that, The dosing kit also includes: The control assembly includes a dosing drive; and a first dosing valve and a second dosing valve connected to the dosing drive and the feed pipe; the first dosing valve is disposed on a first branch of the feed pipe; the second dosing valve is disposed on a second branch of the feed pipe. The dosing drive unit, connected to the monitoring component, is used to control the first dosing valve to adjust the calcium and magnesium dosage and the second dosing valve to adjust the alkaline agent dosage according to the operating indicators.

9. The vertical flow biological-induced phosphorus removal system according to any one of claims 1-8, characterized in that, The flow guiding device includes: a first inner inclined flow guiding section, a first outer inclined flow guiding section, a second inner inclined flow guiding section, and a second outer inclined flow guiding section connected end to end; The first and second inclined guide sections are respectively provided with a first sieve hole and a second sieve hole, and the diameter of the first sieve hole is smaller than the diameter of the second sieve hole. The aeration device is located at the second external inclined guide section; The phosphorus removal agent dosing device is located below the second outer inclined guide section and is used to add enhanced phosphorus removal agent.

10. A phosphorus removal process, employing the vertical flow biological-induced phosphorus removal system according to any one of claims 1-9, characterized in that the steps include... include: First, the wastewater enters the vertical flow biological induced phosphorus removal system; Next, the aeration device starts aeration, and the wastewater in the vertical flow biological induced phosphorus removal system forms a flow field. The flocculent sludge, small-diameter granular sludge and large-diameter granular sludge in the wastewater form a granular sludge system. Then, the phosphorus removal agent is added while the particles are being crushed by the phosphorus removal agent dosing device to remove pollutants from the wastewater; Finally, the treated wastewater is discharged into a sedimentation tank for settling, awaiting further treatment.

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