Industrial drainage activated sludge treatment equipment

Abstract

The invention relates to the technical field of industrial sewage treatment, in particular to industrial drainage activated sludge treatment equipment. Comprising an aeration tank body, a tank cavity is formed in the aeration tank body, an aeration system comprises an aeration main pipe annularly coiled at the bottom of the tank cavity and a plurality of aeration head groups communicated with the aeration main pipe, each aeration head group comprises a plurality of nozzles with different orientations, a downward inclination angle is formed between the axis of the spraying end of each nozzle and the horizontal line, and the opening of the spraying end of each nozzle is outwards expanded. According to the invention, the nozzle is designed to have a downward inclined angle, so that oxygen is sprayed to the bottom of the pool in the form of inclined airflow, deposited solids are effectively dispersed by means of horizontal thrust, the probability that sediments directly fall into the opening of the nozzle is reduced by means of the characteristic of the inclined direction, and the blocking risk is structurally reduced; through a plurality of gas conveying cavities formed by the outwards-expanded extension rods and the internal winding rods, gas flow is dispersed to reduce local shearing force, activated sludge flocs are prevented from being excessively scattered, and meanwhile, the blowing area is enlarged.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater technology, and more specifically, to an activated sludge treatment device for industrial wastewater. Background Technology

[0002] In the field of industrial wastewater treatment, the wastewater produced is complex in composition, often containing high concentrations of organic matter, heavy metal ions, suspended particles and recalcitrant substances. The activated sludge process is currently the mainstream and efficient treatment technology. It uses the adsorption and degradation of activated sludge (a flocculent body composed of aerobic microorganisms, microbial metabolites and adsorbed pollutants) in the aeration tank to convert pollutants in wastewater into harmless substances, ultimately achieving compliant discharge. The core operating conditions of the activated sludge process depend on the air delivery pipes and aeration heads at the bottom of the aeration tank: continuous aeration is required to provide sufficient oxygen for the aerobic microorganisms in the activated sludge, so that the activated sludge growth can fully contact the wastewater and thus exert its adsorption-degradation efficiency. However, suspended solids, colloidal substances, and some incompletely degraded pollutants in industrial wastewater will settle to the bottom of the tank along with the activated sludge due to gravity, easily accumulating at pipe interfaces and in the air outlet channels of aeration heads. In addition, some industrial wastewater contains acidic, alkaline, or highly corrosive substances, which will react chemically with the settled sludge and impurities to generate sticky substances or scale, which adhere to the bottom of the aeration tank. After blockage occurs, air circulation is obstructed, leading to interruption or uneven aeration. The aerobic microorganisms in the activated sludge suffer from anaerobic metabolism inhibition, and may even die in large numbers. At the same time, the sludge in the blocked area continues to settle and harden, not only losing its degradation ability but also forming a "dead sludge zone" that is isolated from fresh wastewater, resulting in a decrease in overall treatment efficiency. Therefore, there is an urgent need for an industrial wastewater activated sludge treatment device to solve the above problems. Summary of the Invention

[0003] This invention provides an industrial wastewater activated sludge treatment device. Through the coordinated design of the air supply pipeline layout, nozzle structural parameters, and airflow direction of the aeration system, oxygen is stably transported and directionally dispersed from an external air source, entering the tank cavity in a low-impact, wide-coverage diffusion airflow pattern. This creates an aeration environment within the tank cavity characterized by "no sedimentation dead zones, stable floc structure, and uniform dissolved oxygen distribution," providing a continuous supply of sufficient oxygen to the aerobic microorganisms in the activated sludge. This achieves highly efficient purification of industrial wastewater, thereby solving the problems mentioned in the background art. The activated sludge process relies on bottom aeration for oxygen supply. Impurities in industrial wastewater can easily cause blockage and corrosion of the aeration heads in the pipelines, thus reducing efficiency.

[0004] To achieve the above objectives, the sludge treatment equipment includes an aeration tank body, which forms a cavity inside for containing sewage and activated sludge, with a sludge pipe connected to one side of the cavity; a sewage pipe, with multiple sewage branch pipes extending into the cavity fixed to the side end of the main pipe; and an aeration system for supplying oxygen to the cavity. The aeration system includes an aeration main pipe coiled in a ring around the bottom of the pool cavity and multiple aeration head groups connected to the aeration main pipe; the aeration head group includes multiple nozzles with different orientations, and the axis of the nozzle's ejection end forms a downward inclination angle ∠a with the horizontal line, spraying oxygen into the bottom of the pool cavity in the form of oblique airflow to impact and disperse the solid matter deposited at the bottom of the pool. The nozzle has an outward-expanding nozzle opening, which is configured to diffuse the oblique airflow to increase the bottom scouring area and reduce the airflow shear force, thereby maintaining the floc structure of the activated sludge. The multiple nozzles are oriented so that the oblique airflows they generate can interweave and supplement each other at the bottom of the tank cavity, forming a scouring flow field that covers the bottom of the tank cavity without dead angles.

[0005] In the above technical solution, because the bottom of the pool is prone to aeration blockage and sludge caking due to the deposition of suspended solids, colloids and other impurities and the scaling of corrosive substances during industrial wastewater treatment, an aeration system with a ring-shaped aeration main pipe and multi-directional nozzles is used to disperse the solids at the bottom of the pool with an oblique airflow at an angle of ∠a. The outward-expanding opening diffuses the airflow to reduce shear force and protect the flocs. Moreover, the interlacing airflow forms a thorough scouring without dead angles, ensuring the efficiency of aeration and sludge degradation.

[0006] Based on this, the nozzle includes a main rod, with a secondary rod sealed at the top. Both the main rod and the secondary rod are hollow structures. ∠a is the angle formed by the parallel extension line of the top of the main rod and the axis of the opening of the secondary rod. An extension rod with a hollow flared opening is provided at the opening of the secondary rod. The sealed connection and hollow structure of the main rod and the secondary rod ensure leak-free oxygen delivery and guarantee oxygen supply efficiency. The angle ∠a between the secondary rod and the main rod allows oxygen to be sprayed at an oblique airflow towards the bottom of the tank, precisely impacting and dispersing the deposited solids. The hollow flared opening structure of the extension rod diffuses the oblique airflow, both expanding the scouring area of ​​the tank bottom to reduce dead zones of sedimentation and reducing airflow shear force, preventing the activated sludge flocs from breaking and maintaining their degradation capacity.

[0007] In addition, the angle range of ∠a is 15°-30°, which achieves a functional balance between anti-deposition and floc protection. Specifically, it provides moderate impact force to the solids deposited at the bottom of the pool through oblique airflow, avoiding the accumulation of impurities and thus preventing deposition. At the same time, because the airflow is not excessively horizontal or vertical, it reduces the shearing and impact on the activated sludge flocs, protecting the floc structure.

[0008] The nozzles installed on the surface of the annular outer pipe are arranged in a unidirectional manner and face the center of the pool cavity, while the nozzles installed on the surface of the central gas transmission pipe are arranged in an alternating bidirectional manner.

[0009] Compared with existing technologies, this solution does not rely on high-frequency maintenance and cleaning or high-pressure airflow impact, and achieves synergistic optimization of the anti-clogging performance of the aeration system, the protection of activated sludge flocs, and the thorough cleaning of the bottom of the tank in industrial wastewater treatment. Specifically, by designing the nozzles at a downward angle, oxygen is sprayed at an oblique airflow to the bottom of the tank. This effectively disperses the deposited solids with the help of horizontal thrust, and reduces the probability of sediment falling directly into the nozzle opening by utilizing the oblique direction characteristics, thus structurally reducing the risk of clogging. Through the outwardly expanding extension rod and the multiple air delivery chambers formed by the internal winding rod, the airflow is dispersed to reduce local shear force, reduce the excessive dispersion of activated sludge flocs, and at the same time expand the blowing area. In addition, the multiple nozzles installed at the bottom of the pool cavity form an integrated spray system. The layout of the annular outer pipe nozzles facing the center of the pool cavity and the staggered bidirectional placement of the central air supply pipe nozzles allows the oblique airflows of the multiple nozzles to interweave and supplement each other, forming a scouring flow field that covers the bottom of the pool without dead angles. Combined with the nozzle height difference setting, it ensures uniform contact between activated sludge and industrial wastewater, thereby improving the pollutant degradation efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the pool cavity of the present invention; Figure 3 For the present invention Figure 2 A schematic diagram of the structure at point A; Figure 4 This is a schematic diagram of the aeration system structure of the present invention; Figure 5 This is a cross-sectional side view of the aeration tank body of the present invention; Figure 6 This is a schematic diagram of the aeration head assembly structure of the present invention; Figure 7 This is a diagram showing the gas being transported from inside the aeration head assembly according to the present invention. Figure 8 This is an exploded structural diagram of the aeration head assembly of the present invention; Figure 9 This is a top view of the aeration head assembly of the present invention.

[0011] The meanings of the labels in the diagram are as follows: 1. Aeration tank body; 10. Tank cavity; 11. Sewage pipe; 12. Sewage branch pipe; 13. Sludge pipe; 2. Aeration system; 21. Aeration head assembly; 22. Central air supply pipe; 23. Annular outer pipe; 24. Air source pipe; 211. Main rod; 212. Secondary rod; 213. Extension rod; 214. Fixing ring; 215. Clamping pad; 216. Winding rod; 217. Air delivery chamber. Detailed Implementation

[0012] 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.

[0013] This invention provides an industrial wastewater activated sludge treatment device, see [link to relevant documentation]. Figures 1-3 As shown, it includes an aeration tank body 1, which forms a tank cavity 10 for containing sewage and activated sludge. A sludge pipe 13 is connected to one side of the tank cavity 10. A sewage pipe 11 has multiple sewage branch pipes 12 extending into the tank cavity 10 fixed to its main pipe side end. Aeration system 2 is used to deliver oxygen into the pool cavity 10. Aeration system 2 includes an aeration main pipe that is coiled in an annular shape around the bottom of the pool cavity 10 and multiple aeration head groups 21 that are connected to the aeration main pipe. The aeration head assembly 21 includes multiple nozzles with different orientations. The axis of the nozzle's ejection end forms a downward angle ∠a with the horizontal line, spraying oxygen into the bottom of the pool cavity 10 in the form of an oblique airflow to impact and disperse the solid matter deposited at the bottom of the pool. The nozzle has an outward-expanding nozzle opening, which is configured to diffuse the oblique airflow to increase the bottom scouring area and reduce the airflow shear force, thereby maintaining the floc structure of activated sludge. The orientation of the multiple nozzles is configured so that the oblique airflows they generate can interweave and complement each other at the bottom of the pool cavity 10, forming a scouring flow field that covers the bottom of the pool cavity 10 without dead angles.

[0014] In the core process of activated sludge wastewater treatment, the continuous and stable supply of oxygen to the aeration tank 1 is a crucial prerequisite for ensuring the efficient operation of the system. The core principle of the activated sludge process relies on the "activated sludge flocs" within the aeration tank 1, which consist of aerobic microorganisms, microbial metabolites, and adsorbed pollutants. Through the aerobic metabolism of these microorganisms, organic matter, nitrogen, phosphorus, and other pollutants in the wastewater are converted into harmless carbon dioxide, water, and their own proliferation substances. However, the metabolic activities, activity maintenance, and reproduction of aerobic microorganisms all consume a large amount of oxygen. If the oxygen supply is insufficient, the microorganisms will suffer from metabolic stagnation due to lack of oxygen, or even switch to an anaerobic state, producing harmful gases such as hydrogen sulfide. This leads to the deactivation of the activated sludge, deterioration of its settling performance, and ultimately, the loss of its ability to degrade pollutants. Therefore, oxygen needs to be supplied to the interior of the pool cavity 10 through the aeration system 2. The specific structure of the aeration system 2 is disclosed below. The aeration system 2 includes an annular outer pipe 23, which is connected to the air source pipe 24. The air source pipe 24 is connected to an oxygen source. Multiple intermediate air supply pipes 22 are connected inside the annular outer pipe 23. The multiple intermediate air supply pipes 22 and the annular outer pipe 23 are all fixed to the bottom of the pool cavity 10 by a bracket.

[0015] like Figure 4 As shown, in the activated sludge process for treating wastewater, the aeration system 2 is the core component for supplying oxygen to the chamber 10 of the aeration tank body 1. The annular outer pipe 23 serves as the main air supply channel, which is directly connected to an external oxygen source through the air source pipe 24 to receive and distribute oxygen. The multiple intermediate air supply pipes 22 connected inside further divert oxygen to different areas at the bottom of the chamber 10, so that the activated sludge in different locations within the chamber 10 can receive oxygen. Furthermore, both the annular outer pipe 23 and the central gas transmission pipe 22 are fixed to the bottom of the pool cavity 10 (not shown in the figure) by a bracket, which can make the position of the gas transmission pipe at the bottom of the pool cavity 10 stable and prevent the pipe from shifting due to water flow or sludge impact. The fixed layout of the pipe can maintain the oxygen transmission path without interference, ensure the continuity of oxygen supply, and the overall stable oxygen supply environment can maintain the activity of activated sludge flocs and ensure the continuous progress of pollutant degradation process.

[0016] After oxygen enters the annular outer pipe 23 and the middle gas transmission pipe 22, it needs to be sprayed into the pool cavity 10 through a nozzle. (See reference...) Figure 5 and Figure 6 The specific structure of the nozzle is disclosed. The nozzle includes a main rod 211, and a secondary rod 212 is sealed at the top of the main rod 211. Both the main rod 211 and the secondary rod 212 are hollow structures. ∠a is the angle formed by the parallel extension line of the top of the main rod 211 and the opening axis of the secondary rod 212.

[0017] An extension rod 213 is provided at the opening of the auxiliary rod 212. The extension rod 213 has a hollow flared structure.

[0018] The nozzle is a component in the aeration system 2 that releases oxygen from the annular outer pipe 23 or the central air supply pipe 22 into the pool cavity 10. Each nozzle includes a main rod 211 and a secondary rod 212, which are combined... Figure 7 As shown, both the main rod 211 and the auxiliary rod 212 adopt a hollow structure. The top of the main rod 211 is connected to the auxiliary rod 212 by a sealed sleeve, which allows the auxiliary rod 212 to be disassembled and replaced. At the same time, it forms a complete flow channel for oxygen to enter the nozzle and reduces oxygen leakage at the junction of the main rod 211 and the auxiliary rod 212. like Figure 6 As shown, the angle ∠a formed by the parallel extension line of the top of the main rod 211 and the opening axis of the secondary rod 212 (∠a in the attached diagram mainly describes the position; the angle shown is for illustrative purposes only) defines the direction of oxygen ejection, ensuring that oxygen is not released randomly or simply ejected vertically, but rather enters the pool cavity 10 at the angle corresponding to ∠a. Figure 8 The extension rod 213 set at the opening of the secondary rod 212 has a flared structure, which receives the oxygen transported by the secondary rod 212 and diffuses the oxygen through the flared shape of the flared mouth, changing the flow state when the oxygen is ejected and reducing the direct impact of oxygen on the material in the pool cavity 10 in the form of concentrated airflow. Overall, after oxygen enters the nozzle through the pipeline, it can be delivered without leakage through the sealed main rod 211 and auxiliary rod 212, and can also be directionally sprayed by the angle of ∠a. Then, the flow pattern is diffused through the funnel structure of the extension rod 213, and finally enters the tank cavity 10 in a preset direction and dispersion degree, making full contact with the activated sludge and sewage in the tank cavity 10, providing sufficient oxygen for the metabolism of aerobic microorganisms. At the same time, the combination of directional spraying and flow diffusion affects the suspension state of activated sludge, avoids local accumulation of sludge, and thus ensures the mixing effect of activated sludge and sewage.

[0019] Based on the principle of "gradually expanding channel flow transformation" in fluid mechanics, when oxygen enters the funnel structure of the expanding rod 213 from the narrow channel of the secondary rod 212, the flow cross-section gradually increases with the expansion. According to the continuity equation (existing technology), the airflow velocity will decrease accordingly. The originally concentrated high-speed airflow is dispersed into multiple low-speed airflows. Furthermore, the inner wall of the funnel guides the airflow, causing it to diffuse outwards along the angle of the expansion, breaking the original straight flow trajectory and forming a flow field that diverges outwards. This prevents oxygen from being ejected as a single concentrated airflow stream, transforming it into a diffused airflow with a wider coverage and a gentler velocity. During the oxygen ejection process, the local impact force of the dispersed airflow on the activated sludge flocs and bottom sediments is also reduced. This reduces the direct shearing of the activated sludge flocs by the concentrated airflow, causing them to break, and also reduces the violent impact on the bottom sediments of the tank cavity 10. This avoids sludge splashing and secondary suspension runaway caused by excessive local agitation. At the same time, the diffused airflow covers a larger area, improving the contact efficiency between oxygen and water and sludge.

[0020] Based on the core requirements of the activated sludge process for aeration effect, the ∠a angle range is set to 15°-30°. This is achieved by balancing the airflow disturbance intensity required for anti-deposition and the low-impact requirement for floc protection. From the perspective of anti-deposition function, ∠a needs to ensure that the oxygen spray can effectively disturb the activated sludge at the bottom of the tank cavity 10. If ∠a is less than 15°, the angle between the opening axis of the secondary rod 212 and the parallel extension line of the top of the main rod 211 is too small, and the oxygen spray direction will be closer to horizontal. The downward or oblique impact force of the airflow on the sludge deposited at the bottom of the tank cavity 10 is insufficient, which cannot break the static balance of the sludge particles and easily leads to the accumulation of sludge at the bottom of the tank, forming a sediment layer. If ∠a is greater than 30°, the angle is too large, and the oxygen spray direction is closer to vertical downward. Although the airflow can generate a strong impact on the sludge directly below, the impact range is concentrated in a small area directly below the nozzle. Other areas at the bottom of the tank cavity 10 are still prone to deposition due to insufficient disturbance. Moreover, the excessively vertical airflow will aggravate the local water flow turbulence at the bottom of the tank cavity 10, which may instead disrupt the uniform distribution of sludge.

[0021] From the perspective of floc protection, ∠a needs to be controlled to keep the impact intensity of airflow on activated sludge flocs within a safe range. Activated sludge flocs are composed of aerobic microorganisms, metabolic products, and adsorbed pollutants, and have a fragile structure. If ∠a is less than 15°, the horizontal airflow will generate a continuous lateral shear force on the suspended flocs, which will easily break the flocs into fine particles, causing the flocs to lose their activity. If ∠a is greater than 30°, the strong vertical downward impact airflow will directly hit the bottom of the tank cavity 10 or the suspended flocs, causing the flocs to break and also damaging their structural integrity.

[0022] An angle range of 15°-30° allows the oxygen to be ejected at an angle downwards with a moderate diffusion range. This not only moderately disturbs the sludge at the bottom of the pool chamber 10 through the oblique airflow, preventing localized deposition, but also keeps the impact intensity within the range that the flocs can withstand because the airflow direction is not excessively horizontal or vertical, thus preventing floc shearing or breakage. Ultimately, this achieves a functional balance between preventing deposition and protecting the flocs.

[0023] Furthermore, the range of angle ∠a can be derived and verified by combining fluid dynamics formulas, activated sludge characteristic parameters, and existing process data. From the perspective of anti-deposition requirements, the simplified formula can be derived based on the momentum theorem. (F is the horizontal thrust of the airflow on the sludge,) Let Q be the air density, Q be the gas flow rate per nozzle, and v be the gas ejection velocity. That is, ∠a), combined with the bulk density of activated sludge flocs (1020-1050). Critical thrust for single particle initiation ( ) and conventional aeration parameters (Q=0.02-0.05) (v=8-12m / s), when ∠a=15°, The calculated horizontal thrust, after being diffused and superimposed by the extension rod 213, can reach [amount missing]. To meet the sludge start-up requirements and avoid sedimentation; if ∠a is less than 15°, the excessive horizontal force can easily cause lateral shearing of the flocs, while if ∠a is greater than 30°, the airflow is close to downward, and the impact range is concentrated, leading to local sedimentation.

[0024] From the perspective of floc protection requirements, the vertical component velocity of airflow When considering the critical shear velocity of flocs (0.3-0.5 m / s) and ∠a = 30°, After the airflow diffuses through the funnel-shaped opening (the cross-sectional area increases by 2-3 times, reducing the velocity) and is offset by water convection, the actual impact velocity is about 0.8-1.5 m / s and is in a dispersed state, not reaching the floc breakage threshold. If ∠a>30°, the vertical velocity component rises to 1.8-2.5 m / s, and the local shear force exceeds the binding force of the extracellular polymeric substances (EPS) of microorganisms, leading to floc breakage.

[0025] During long-term use, suspended activated sludge particles and impurities in the wastewater in the pool cavity 10 are easily carried into the interior of the expansion rod 213 by the water flow or air flow, thereby blocking the flow channel between the auxiliary rod 212 and the main rod 211. Therefore, multiple winding rods 216 are installed on the inner wall of the opening of the expansion rod 213, which forces multiple air conveying chambers 217 to be formed at the opening of the expansion rod 213.

[0026] The improvement lies in: combination Figure 7It can be seen that the gaps formed between the multiple winding rods 216 located on the inner wall of the opening of the expansion rod 213, together dividing the flared opening of the expansion rod 213 into multiple independent air conveying chambers 217. The diameter of the winding rods 216 and the spacing between them are designed according to the particle size of the impurities in the pool, ensuring that while not hindering the passage of oxygen, they form a physical barrier against larger sludge particles and impurities, reducing the probability of clogging of the secondary rod 212 and the main rod 211, and achieving the synergy of dust blocking and aeration functions.

[0027] The height difference between the lower end of the opening of the expansion rod 213 and the bottom of the inner cavity of the tank cavity 10 is 50-200 mm. Based on the comprehensive determination of the aeration airflow efficiency, activated sludge suspension requirements, and tank bottom environment adaptability: From the perspective of the disturbance effect of the airflow on the sludge at the bottom of the tank cavity 10, this height difference needs to ensure that the oblique airflow of ∠a can effectively cover the tank bottom area. If the height difference is less than 50 mm, the opening of the expansion rod 213 is close to the bottom of the tank cavity 10, and the airflow is likely to directly impact the concrete or sediment layer at the bottom of the tank cavity 10 after being ejected, causing the airflow to rebound and become turbulent. This not only fails to uniformly suspend the sludge, but may also damage the activated sludge floc structure due to excessive local impact. If the height difference is greater than 200 mm, the opening is too far from the bottom of the tank cavity 10, and the oblique airflow will be attenuated by water resistance before reaching the bottom of the tank cavity 10, and the disturbance force will be weakened. This will not be able to break the static balance of the sludge particles at the bottom of the tank, and will easily form a sedimentation dead zone, losing the anti-sedimentation function. From the perspective of the contact efficiency between oxygen and activated sludge, a height difference of 50-200mm is compatible with the diffusion characteristics of the bell mouth of the expansion rod 213. Within this height range, the dispersed airflow ejected from the expansion mouth can form convection with the activated sludge suspended and rising at the bottom of the pool chamber 10. The oxygen in the airflow can quickly dissolve and be utilized by the aerobic microorganisms in the sludge. If the height difference is too small, the airflow diffusion range is limited, and the oxygen is only concentrated in a local area at the bottom of the pool chamber 10, which easily leads to uneven distribution of dissolved oxygen. If the height difference is too large, the airflow needs a longer path to contact the sludge, and some oxygen escapes to the water surface without dissolving, reducing the oxygen utilization rate. In addition, the thickness of the suspended layer of activated sludge mixture in the tank chamber 10 is usually 0.8-1.5m, and the bottom height difference of 50-200mm can ensure that the airflow disturbance area is fully connected with the bottom of the sludge suspended layer, avoiding sludge stratification (upper layer suspended, lower layer sedimented) due to improper height. At the same time, it works in conjunction with the bottom installation height of the annular outer pipe 23 and the middle air supply pipe 22 in the aeration system 2 (usually 30-80mm from the bottom) to form a coherent bottom airflow disturbance.

[0028] Since the nozzle needs to form a stable and sealed connection with the annular outer pipe 23 and the middle gas transmission pipe 22 to ensure that oxygen can smoothly enter the nozzle main rod 211 from the pipeline, and also needs to adapt to the slight dimensional deviations or vibrations that may occur during pipeline installation, in order to reduce the loosening or leakage of the connection due to rigid contact, the bottom of the nozzle is connected to the annular outer pipe 23 and the middle gas transmission pipe 22 through a fixing ring 214.

[0029] The bottom of the retaining ring 214 is provided with a clamping pad 215, and the clamping pad 215 is made of elastic material.

[0030] See Figure 7 As shown, the bottom of the nozzle is connected to the annular outer pipe 23 and the middle air supply pipe 22 via a fixing ring 214. The bottom of the fixing ring 214 is provided with a clamping pad 215, which is made of an elastic material (such as nitrile rubber). The fixing ring 214 is a ring-shaped structure, with its inner wall fitting against the outer wall of the nozzle bottom and its outer wall fixed at the pipe interface. This is used to achieve the positioning connection between the nozzle and the pipe. The clamping pad 215 is sandwiched between the fixing ring 214 and the pipe surface, which can fill the gap between the two and absorb the stress at the connection part through its own elastic properties. This connection structure can ensure that the position between the nozzle and the annular outer pipe 23 and the middle air supply pipe 22 is fixed, reducing the displacement of the nozzle due to water flow impact or airflow vibration in the pool.

[0031] The nozzles installed on the surface of the annular outer pipe 23 are arranged in a unidirectional manner and face the center of the pool cavity 10, while the nozzles installed on the surface of the central gas transmission pipe 22 are arranged in an alternating bidirectional manner.

[0032] Combination Figure 9As shown, the nozzles on the surface of the annular outer pipe 23 are arranged unidirectionally and uniformly face the center of the pool cavity 10, while the nozzles on the surface of the central air supply pipe 22 are arranged in a staggered bidirectional pattern. The annular outer pipe 23, as the outer air supply pipe at the bottom of the pool cavity 10, covers the edge of the pool cavity 10. The unidirectional nozzles facing the center concentrate the airflow towards the central area of ​​the pool cavity 10, reducing dead zones caused by the diffusion of edge airflow towards the pool wall. The central air supply pipe 22, located inside the annular outer pipe 23, covers the central area of ​​the pool cavity 10. Its staggered bidirectional arrangement allows the airflow to diffuse to both sides of the central area. The combination of these two forms a complementary airflow network: peripheral convergence towards the center and bidirectional dispersion in the center. From an effectiveness standpoint, the central airflow from the nozzles of the annular outer pipe 23 and the bidirectional flow from the nozzles of the central air supply pipe 22... The diffused airflows intertwine at the bottom of the pool cavity 10, covering the entire area from the pool wall to the center. This solves the problem of sedimentation dead zones that easily occur at the junction of the edge and center of the pool cavity 10 in traditional layouts. Secondly, the coordinated design of airflow direction avoids local airflow collisions or gaps. The peripheral airflow pushes the edge sludge towards the center, while the bidirectional airflow in the center further disperses and suspends the sludge, enabling the activated sludge to form a uniform circulation flow within the pool cavity 10, improving the contact efficiency between sludge and wastewater. Furthermore, through clear regional orientation planning, while ensuring coverage, it reduces the decrease in oxygen utilization caused by mutual interference of airflows, making the dissolved oxygen distribution within the pool cavity 10 more uniform. This ensures both the metabolic needs of aerobic microorganisms and the stability of the floc structure.

[0033] Working principle: First, the wastewater to be treated is diverted from wastewater pipe 11 to wastewater branch pipe 12, flowing into the pool cavity 10. Then, an external oxygen source is connected to the annular outer pipe 23 of the aeration system 2 via air source pipe 24. The annular outer pipe 23 serves as the main air supply channel, diverting oxygen to multiple interconnected intermediate air supply pipes 22. The oxygen is then transported through the annular outer pipe 23 and the intermediate air supply pipes 22 to the nozzles connected to each pipe. The nozzles, through a sealed hollow structure connecting the main rod 211 and the auxiliary rod 212, form a leak-free oxygen flow channel. Simultaneously, the clamp formed by the main rod 211 and the auxiliary rod 212... The angle is used to limit the oxygen to be sprayed in an oblique direction, which avoids the lateral shear force of horizontal spray or the concentrated impact force of vertical spray, and can also create a moderate disturbance to the sludge at the bottom of the pool. The oxygen then enters the trumpet-shaped expansion rod 213 at the opening of the secondary rod 212. The expansion rod 213 reduces the airflow speed by expanding the flow cross section, and disperses the concentrated airflow into multiple low-speed diffusion airflows. The inner wall of the expansion rod 213 is divided into multiple air delivery chambers 217 by the rod 216, which blocks sludge particles and impurities without obstructing the passage of oxygen, and reduces the blockage of the main rod 211 and the secondary rod 212. With the ring-shaped outer pipe 23 nozzles facing unidirectionally towards the center of the pool cavity 10 and the central air supply pipe 22 nozzles arranged in a staggered bidirectional pattern, a complementary airflow network of "converging flow from the periphery to the center and bidirectional dispersion flow in the center" is formed. This eliminates dead zones in oxygen supply and disturbance at the bottom of the pool. Ultimately, the dispersed oxygen comes into full contact with the activated sludge and wastewater in the pool cavity 10, providing sufficient oxygen for the metabolism of aerobic microorganisms. At the same time, the airflow drives the activated sludge to be evenly suspended, avoiding local sedimentation. Moreover, the low-impact dispersed airflow will not damage the sludge floc structure, ensuring that microorganisms continuously convert pollutants such as organic matter, nitrogen, and phosphorus in the wastewater into harmless substances such as carbon dioxide and water, thus achieving the purification treatment of industrial wastewater. After treatment, the sludge can be recycled or discharged through the sludge pipe 13.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An industrial wastewater activated sludge treatment device, comprising an aeration tank body (1) having a chamber (10) inside for containing wastewater and activated sludge, and a sludge pipe (13) connected to one side of the chamber (10). The sewage pipe (11) has multiple sewage branch pipes (12) that extend into the pool cavity (10) fixed at the side end of its main pipe. Aeration system (2), used to supply oxygen to the pool cavity (10), characterized in that: The aeration system (2) includes an aeration main pipe coiled in an annular shape around the bottom of the pool cavity (10) and multiple aeration head groups (21) connected to the aeration main pipe. The aeration head group (21) includes multiple nozzles with different orientations. The axis of the nozzle's ejection end forms a downward angle ∠a with the horizontal line, spraying oxygen into the bottom of the pool cavity (10) in the form of oblique airflow to impact and disperse the solids deposited at the bottom of the pool. The nozzle has an outward-expanding nozzle opening, which is configured to diffuse the oblique airflow to increase the bottom scouring area and reduce the airflow shear force, thereby maintaining the floc structure of the activated sludge. The orientation of the multiple nozzles is configured such that the oblique airflows they generate can interweave and complement each other at the bottom of the pool cavity (10), forming a scouring flow field covering the bottom of the pool cavity (10) without dead angles.

2. The industrial wastewater activated sludge treatment equipment according to claim 1, characterized in that: The aeration system (2) includes an annular outer pipe (23), which is connected to an air source pipe (24). The air source pipe (24) is connected to an oxygen source. The annular outer pipe (23) is internally connected to multiple intermediate air supply pipes (22). The multiple intermediate air supply pipes (22) and the annular outer pipe (23) are all fixed to the bottom of the pool cavity (10) by a bracket.

3. The industrial wastewater activated sludge treatment equipment according to claim 1, characterized in that: The nozzle includes a main rod (211), and a secondary rod (212) is sealed at the top of the main rod (211). Both the main rod (211) and the secondary rod (212) are hollow structures. ∠a is the angle formed by the parallel extension line of the top of the main rod (211) and the opening axis of the secondary rod (212).

4. The industrial wastewater activated sludge treatment equipment according to claim 3, characterized in that: An extension rod (213) is provided at the opening of the secondary rod (212), and the extension rod (213) has a hollow flared structure.

5. The industrial wastewater activated sludge treatment equipment according to claim 1, characterized in that: The angle range of ∠a is 15°-30°, achieving a functional balance between anti-deposition and floc protection.

6. The industrial wastewater activated sludge treatment equipment according to claim 4, characterized in that: Multiple winding rods (216) are installed on the inner wall of the opening of the extension rod (213), which forces the opening of the extension rod (213) to form multiple air delivery chambers (217).

7. The industrial wastewater activated sludge treatment equipment according to claim 4, characterized in that: The height difference between the lower end of the opening of the extension rod (213) and the bottom of the inner cavity of the pool cavity (10) is 50-200 mm.

8. The industrial wastewater activated sludge treatment equipment according to claim 2, characterized in that: The bottom of the nozzle is connected to the annular outer tube (23) and the middle gas transmission tube (22) via a fixing ring (214).

9. The industrial wastewater activated sludge treatment equipment according to claim 8, characterized in that: The bottom of the fixing ring (214) is provided with a pad (215), and the pad (215) is made of elastic material.

10. The industrial wastewater activated sludge treatment equipment according to claim 2, characterized in that: The nozzles installed on the surface of the annular outer pipe (23) are arranged in one direction and face the middle of the pool cavity (10), while the nozzles installed on the surface of the middle gas transmission pipe (22) are arranged in a staggered bidirectional manner.

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