A method of conditioning the agitation of a tank

Abstract

The application discloses a method for adjusting the stirring of a regulating pool, and the method divides the regulating pool into a core area and an edge area according to the dynamic pollution load, and adjusts the control strategy of the tilting direction of the aeration stirring device in real time, actively intervenes in the diffusion path of sewage and guides the disturbance, so that the aeration stirring device in the core area is tilted towards the main diffusion direction of the sewage, and the edge area is reversely arranged, the two sides form opposite stirring, and a continuous and organized convection disturbance zone is formed at the boundary, directly guiding the sewage to rapidly diffuse to the edge area in the initial stage of entering the regulating pool, and avoiding the backflow or vortex accumulation phenomenon caused by the impact of the impact flow on the pool wall, meanwhile, the method can avoid the situation that the raw water and the sewage in the regulating pool are difficult to mix due to the concentration gradient stratification, and promotes the efficient mixing of the new sewage and the raw water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment, and particularly relates to a method for adjusting pool stirring. BACKGROUND

[0002] In the field of water treatment, the adjusting pool is a key link in the sewage treatment process, which is usually used to balance the fluctuation of water flow, adjust water quality and quantity, so as to ensure the stable operation of downstream treatment equipment. The aeration stirring device in the adjusting pool is mainly used for effective stirring and gas transmission of sewage, so as to promote the degradation of pollutants and the oxidation and decomposition of organic matter in the sewage. The traditional aeration stirring technology generally adopts a fixed parameter aeration mode and a single gas supply mode, which is difficult to meet the needs of different sewage load changes, especially in the case of large water quality fluctuation or sudden load change. While maintaining the treatment efficiency, the existing technology often faces problems such as high energy consumption, uneven equipment pressure or insufficient treatment effect.

[0003] In the prior art, the design and operation mode of the aeration stirring device mainly depend on manual experience, and it is difficult to dynamically adjust according to the actual load change of the sewage. This traditional static control method not only leads to the reduction of the efficiency of the equipment in the long-time operation process, but also often lags behind in response to sudden pollution load, affecting the stability and reliability of the overall sewage treatment effect. At the same time, the traditional method often adopts a single aeration gas supply mode, ignoring the different needs of different pollution loads for sewage stirring, and cannot fully utilize the potential of the equipment, resulting in energy waste.

[0004] Therefore, it is necessary to design a method for adjusting pool stirring to solve the above problems. SUMMARY

[0005] The present application overcomes the shortcomings of the prior art and provides a method for adjusting pool stirring.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows: a method for adjusting pool stirring, comprising the following steps:

[0007] Step S1, constructing a pollution load dynamic curve according to real-time monitoring of key indicators in a plurality of unit regions in the form of a fan in the adjusting pool;

[0008] Step S2, dynamically dividing the adjusting pool into a core area and an edge area according to the pollution load dynamic curve, wherein the core area is determined when the pollution load of the unit region exceeds a set mutation threshold, and the edge area is determined otherwise, and the core area boundary is dynamically expanded with the diffusion of the sewage;

[0009] Step S3, adjust the working state of the aeration stirring device in the core area to form horizontal disturbance inclined to the main diffusion direction of the sewage, and according to the dynamic of the core area boundary, adjust the working state of the aeration stirring device in the edge area to form convection disturbance inclined to the opposite direction of the sewage diffusion direction, to complete the first-level dispersion;

[0010] Step S4, according to the pollution load dynamic curve, divide the several unit regions of the adjusting pool into high / low load units, and adjust the start / stop state and working state of the aeration stirring device in the partition, to complete the second-level dispersion.

[0011] Step S5, when the pollution load of each unit region meets the low load unit, uniformly enter the synchronous aeration treatment stage.

[0012] In a preferred embodiment of the present application, in the step S1, the key indicators include: chemical oxygen demand, ammonia nitrogen, dissolved oxygen, suspended solids, water level, and inflow rate.

[0013] In a preferred embodiment of the present application, in the step S1, the following sub-steps are included:

[0014] Step S11, divide the adjusting pool into several units, monitor the several units respectively, and normalize the obtained monitoring data;

[0015] Step S12, monitor each unit to calculate the instantaneous pollution load , wherein represents the pollution concentration of the jth region, represents the effective water volume of the region, and n represents the number of units.

[0016] Step S13, record the pollution load of each pollutant at different time points to generate the corresponding pollution load time sequence, and construct a time-load two-dimensional line graph.

[0017] In a preferred embodiment of the present application, in the step S11, the several units are arrayed, the total number of rows is M, the total number of columns is N, and the number of a single unit is , wherein 1≤i≤M, 1≤j≤N.

[0018] In a preferred embodiment of the present application, in the step S2, the following is included: calculate the change rate of the time sequence data to judge the mutation trend of the unit pollution load: , when and the change of the previous moment exceeds the set mutation threshold , mutation occurs, and this unit is the core area, when and the change of the previous moment does not exceed the set mutation threshold If the value of the pollution load of the unit is greater than the threshold value, it indicates that the unit is in the edge area;

[0019] And real-time monitoring of the pollution load of each unit in the edge area, dynamic expansion of the edge range of the core area.

[0020] In a preferred embodiment of the present application, in the step S3, the aeration stirring device is one-to-one corresponding to the unit area;

[0021] The aeration stirring device in the core area is inclined to the opposite direction of the sewage flow direction, and the included angle between the aeration stirring device and the vertical direction is 30°-60°;

[0022] The aeration stirring device in the edge area is inclined to the opposite direction of the sewage flow direction, and the included angle between the aeration stirring device and the vertical direction is 30°-60°;

[0023] The aeration stirring device in the first dispersion adopts high-pressure low-frequency pulse gas supply.

[0024] In a preferred embodiment of the present application, in the step S4, the units in the adjusting tank are divided into high-load units and low-load units by the threshold value;

[0025] The aeration stirring device in the high-load unit is inclined to the vertical direction, and the deflection angle is-20°-20°, and high-pressure low-frequency pulse gas supply is adopted;

[0026] The aeration stirring device in the low-load unit is inclined to the vertical direction, and the deflection angle is-20°-20°, and the aeration stirring device is closed.

[0027] In a preferred embodiment of the present application, in the step S5, according to the pollution load of each unit area, it is determined that the pollution of the adjusting tank is in a low-load state, and the aeration stirring device in the adjusting tank adopts low-pressure high-frequency pulse gas supply.

[0028] In a preferred embodiment of the present application, the specific parameters in the low-pressure high-frequency pulse gas supply include: the gas source pressure range is 0.05-0.1 MPa, the pulse frequency is 1-3 Hz, and the pulse duration is 0.2-0.5 s;

[0029] The specific parameters in the high-pressure low-frequency pulse gas supply include: the gas source pressure range is 0.15-0.25 MPa, the pulse frequency is 0.1-0.5 Hz, and the pulse duration is continuous gas supply.

[0030] In a preferred embodiment of the present application, the inclination range of the aeration stirring device and the vertical direction is-60°-60°.

[0031] The present application solves the defects in the background art, and has the following beneficial effects:

[0032] (1) The present application provides a method for adjusting the stirring of a pool, which divides the adjusting pool into a core area and an edge area according to the dynamic pollution load, and adjusts the control strategy of the tilting direction of the aeration stirring device in real time, actively intervenes and disturbs the diffusion path of the sewage, tilts the aeration stirring device in the core area towards the main diffusion direction of the sewage, and reversely sets the edge area, forms opposite stirring on both sides, thereby constructing a continuous and organized convection disturbance belt at the boundary, directly guiding the sewage to rapidly diffuse to the edge area in the initial stage of entering the adjusting pool, and avoiding the backflow or vortex accumulation phenomenon caused by the impact of the shock flow on the pool wall, significantly improving the preliminary mixing efficiency of the sewage, at the same time, the stirring direction can be adjusted in real time according to the dynamic change of the diffusion boundary, the mixing of the raw water and the sewage in the adjusting pool due to the concentration gradient stratification can be avoided, the new sewage and the raw water are caused to form efficient mixing, the driving action of the horizontal momentum of the sewage in the adjusting pool in the initial diffusion stage is enhanced, the mixing speed of the sewage and the raw water in the adjusting pool is effectively improved, the uneven residence time of the sewage in the adjusting pool is shortened, and therefore the pretreatment efficiency and the overall water quality control response speed are improved.

[0033] (2) The present application provides a method for adjusting the stirring of a pool, which drives the boundary between the core area and the edge area to advance layer by layer towards the edge of the adjusting pool with the diffusion of the sewage, constructs a multilayer disturbance buffer zone on the diffusion path of the sewage, forms a multistage energy dissipation layer, reduces the original flow rate of the sewage, reduces its kinetic energy, avoids the backflow of the sewage caused by the impact of the sewage on the edge of the adjusting pool, causes local disorder of the sewage in the adjusting pool, disturbs the concentration distribution, effectively guides the migration and diffusion of the high-concentration sewage to the low-concentration area, and speeds up the homogenization process of the sewage; at the same time, through the dynamic advancing control of the boundary, a disturbance belt is formed, the pollution load is effectively buffered and absorbed, and short circuit, backflow or suspended solid accumulation caused by the direct impact of high-concentration sewage on the edge of the pool body is avoided.

[0034] (3) The present application provides a method for adjusting the stirring of a pool, which constructs an efficient disturbance network in the adjusting pool through a double-layer disturbance mechanism of primary dispersion and secondary dispersion, realizes the ordered induction of pollution diffusion from the center to the periphery by means of horizontal disturbance in the core area and convection disturbance in the edge area in the primary dispersion stage, adjusts the aeration stirring state according to the difference between high-load units and low-load units in the secondary dispersion stage, realizes the re-homogenization regulation of the pollution in the unit area, breaks the problems of short circuit and concentration stratification in the traditional pool through the layer-by-layer progressive disturbance design, and realizes the rapid mixing and uniform distribution of the pollutants in the whole pool body.

[0035] (4) The present application provides a kind of method for adjusting pool stirring, using the variable with multiple working states corresponding to the core area, edge area and high / low load unit area dynamically divided in regulating pool, realize the intelligent matching of stirring direction and energy, by using high-pressure low-frequency pulse aeration in core area and edge area, enhance horizontal disturbance and convection, reduce impact force, speed up the primary dispersion of pollutants, and in the low load stage after load balancing, it is adjusted to low-pressure high-frequency pulse state, provide maintenance mixing, reduce energy consumption, and then when pollution load distribution is uneven or water disturbance is intense, the disturbance energy and direction can be accurately controlled, thereby improving the homogenization efficiency of pollutant spatial distribution.

[0036] (5) The present application provides a kind of method for adjusting pool stirring, by means of dynamic zoning, hierarchical disturbance and step-by-step boundary movement, the process of " layer-by-layer absorption load" is formed in regulating pool, not only reduce the hydraulic impact peak, but also disperse the pressure in different units, avoid the inhibition caused by short-time high concentration to biochemical system, enhance the functional positioning of regulating pool as " adjustment, homogenization, buffer" device. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0038] Figure 1 It is a flow chart of the method for adjusting pool stirring of the preferred embodiment of the present application;

[0039] Figure 2 It is a top view structural schematic diagram of the regulating pool of the present application;

[0040] Figure 3 It is a structural schematic diagram of the regulating pool of the present application;

[0041] Figure 4 It is a structural schematic diagram of the aeration stirring device of the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely in the following combined with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0043] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description, and that the present application will work in other implementations or bring about other benefits, presently unforeseeable.

[0044] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0045] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0046] As shown in Figure 1 A method for adjusting the stirring of a pool, comprising the following steps:

[0047] Step S1, according to the real-time monitoring of the key indicators in a plurality of unit areas in the adjusting pool, a pollution load dynamic curve is constructed;

[0048] Step S2, according to the pollution load dynamic curve, the adjusting pool is dynamically divided into a core area and an edge area, wherein when the pollution load of a unit area exceeds a set mutation threshold, it is determined as a core area, otherwise as an edge area, and the core area boundary is dynamically expanded with the sewage diffusion;

[0049] Step S3, adjust the working state of the aeration stirring device in the core area to form a horizontal disturbance inclined to the main diffusion direction of the sewage, according to the dynamic of the core area boundary, adjust the working state of the aeration stirring device in the edge area to form a convection disturbance inclined to the opposite direction of the sewage diffusion and the sewage diffusion direction, and complete the first dispersion;

[0050] Step S4, according to the pollution load dynamic curve, the several unit areas of the adjusting pool are divided into high / low load units, the start-stop state and working state of the aeration stirring device are controlled in sections, and secondary dispersion is completed;

[0051] Step S5, when the pollution load of each unit area meets the low load unit, the synchronous aeration treatment stage is entered.

[0052] In the step S3, the aeration stirring device is several, which corresponds to the unit area one by one;

[0053] The aeration stirring device in the core area is inclined to the sewage flow direction, and the included angle between the aeration stirring device and the vertical direction is 30°-60°;

[0054] The aeration stirring device in the edge area is inclined to the opposite direction of the sewage flow direction, and the included angle between the aeration stirring device and the vertical direction is 30°-60°;

[0055] The aeration stirring device in the primary dispersion adopts high-pressure low-frequency pulse gas supply.

[0056] Among them, a plurality of aeration stirring devices are arranged at the bottom of the adjusting pool, and are distributed in a two-dimensional grid array. The unit spacing is reasonably set according to the pool size, hydraulic retention time and mixing radius (for example, the spacing is 1-2 meters). The aeration stirring device includes an electromagnetic valve, a pulse controller and a variable inclination diffuser driven by a servo;

[0057] As shown in Figure 2 , Figure 3 and Figure 4 , the aeration stirring device is installed on the gas supply pipe at the bottom of the adjusting pool. A plurality of gas outlets are formed on the gas supply pipe 1. Each gas outlet corresponds to an aeration stirring device. The aeration stirring device specifically includes: a rotating ring 2, an electromagnetic valve, a pulse controller and a diffuser 3 installed on the rotating ring. The rotating ring 2 is sleeved on the gas outlet position of the gas supply pipe 1. The contact surface between the rotating ring 2 and the gas supply pipe 1 is a cavity, and the rotating ring 2 is rotatably sealed. The diffuser 3 is communicated with the rotating ring 2 through a connecting pipe 7;

[0058] The electromagnetic valve and the pulse controller are installed at the gas outlet position;

[0059] The outer side of the rotating ring 2 is sleeved with a gear ring 4. A rudder 5 is arranged below the gas supply pipe 1. The output shaft of the rudder 5 is fixedly connected with a gear 6 engaged with the gear ring 4, so as to drive the rotating ring 2 to rotate;

[0060] A plurality of air holes are formed on the surface of the diffuser 3, and are communicated with the channel of the connecting pipe 7.

[0061] Among them, the gas supply pipe 1 at the position contacting with the rotating ring 2 is in the shape of a cylinder, which facilitates the rotatable sealing between the rotating ring 2 and the gas supply pipe 1.

[0062] All aeration stirring units are connected with the control system through a communication bus, and are included in independent control channels according to unit numbers, so that subsequent operations such as partition adjustment, pressure control, frequency switching and delay cooperative starting can be realized.

[0063] In the step S1, the key indicators include: chemical oxygen demand, ammonia nitrogen, dissolved oxygen, suspended solids, water level, and influent flow.

[0064] In the step S1, the following sub-steps are included:

[0065] Step S11, the adjustment tank is divided into several units, each unit is monitored, and the obtained monitoring data is normalized;

[0066] Step S12, each unit is monitored, and the instantaneous pollution load is calculated wherein represents the jth area pollutant concentration, represents the effective water volume of the area, and n represents the number of units.

[0067] Step S13, record the pollution load of each pollutant at different time points, generate the corresponding pollution load time sequence, and construct a time-load two-dimensional line graph.

[0068] In the step S11, the several units are arrayed, the total number of rows is M, the total number of columns is N, and the number of a single unit is wherein 1≤i≤M, 1≤j≤N, by dividing the adjustment tank into several units, each unit is regarded as an independent monitoring and control object, online water quality sensors or probes are arranged in each unit, specifically including COD sensors, ammonia nitrogen sensors, dissolved oxygen sensors, suspended solids sensors, and pressure type liquid level transmitters, and are installed according to actual conditions; real-time acquisition of key indicators including chemical oxygen demand, ammonia nitrogen, dissolved oxygen (DO), suspended solids, water level height and influent flow, and normalization processing of original data, unifying different dimension data to the interval [0, 1], so as to eliminate the dimension influence, and lay a foundation for multi-factor comprehensive analysis;

[0069] By time series processing of the instantaneous pollution load of each unit at continuous multiple sampling time points, a pollution load dynamic curve is generated, which can show the fluctuation trend of the load of each unit over time in real time, and identify the sudden increase point and diffusion rate. Unlike the prior art which relies on a single time point or average value to determine the working condition, the time-load two-dimensional line graph of the present scheme can reveal the slope, duration and cumulative amount of load change, providing a quantitative basis for dynamically dividing the core area and the edge area, adjusting the inclination angle of the aeration stirring device and the gas supply mode. Not only does it greatly improve the response speed of the system to peak load and impact inflow, but it also greatly reduces energy waste and sewage short circuit caused by information asymmetry.

[0070] It should be noted that by dividing the adjusting tank into several units, each unit has the same area, and by monitoring the water level, the volume of water in the unit can be obtained, thereby providing a basis for calculating the instantaneous pollution load.

[0071] In the present application, in the step S2, the time series data is subjected to change rate calculation to determine the mutation trend of the unit pollution load: When the change of the unit pollution load exceeds the set mutation threshold value, the unit is marked as a core area. When the change of the unit pollution load does not exceed the set mutation threshold value, the unit is marked as an edge area.

[0072] The pollution load of each unit in the edge area is monitored in real time, and the edge range of the core area is dynamically expanded.

[0073] By continuously calculating the load change rate and mutation trend of each unit area, when the load change rate of a certain area exceeds the preset mutation threshold value, it is marked as a core area, and the remaining area with a gentle load increase is classified as an edge area. At the same time, the identification of the core area is related to the diffusion of sewage.

[0074] It should be noted that in the process of dividing the adjusting tank into a core area and an edge area, the boundary between the core area and the edge area is not static, but will move forward or backward in real time with the diffusion path of the sewage and the fluctuation of the load.

[0075] ​​​​​When the concentration of pollutants in a certain unit suddenly increases, it indicates that sewage has spread to this unit, and this unit is the core area and the boundary of the edge area. Based on the boundary, the working state of the aeration stirring device in step S3 is adjusted, so that the aeration stirring device in the core area pushes the flow of sewage diffusion, while the aeration disturbance device in the edge area forms a counterflow with the diffusion direction of the sewage to form a counter shear band, offsetting the impact flow and accelerating the front mixing, significantly shortening the time of dilution of pollutants from the high concentration core to the periphery, and effectively inhibiting the local concentration exceeding the standard and sludge accumulation.

[0076] Because of the boundary between the core area and the edge area, during the diffusion process of the sewage into the conditioning tank, this boundary changes in real time and gradually expands to the edge of the conditioning tank. Therefore, multiple disturbance buffer zones are constructed on the sewage advancing path, forming multiple energy dissipation layers, reducing the original flow rate of the sewage and its kinetic energy, avoiding the backflow of sewage caused by the impact of sewage on the edge of the conditioning tank, causing local turbulence in the conditioning tank and disturbing the concentration distribution, effectively guiding the migration and diffusion of high-concentration sewage to low-concentration areas, and accelerating the homogenization process of the sewage. At the same time, through the dynamic advancement control of the boundary, a disturbance band is formed, so that the pollution load is effectively buffered and absorbed, avoiding the direct impact of high-concentration sewage on the edge of the tank body, causing short circuit, backflow or suspended solid accumulation.

[0077] At the same time, considering that the raw water and sewage in the conditioning tank are easily stratified due to different pollution concentration gradients during mixing, the aeration stirring device adjusts the stirring direction in real time according to the dynamic changes of the diffusion boundary, promotes efficient mixing of new sewage and raw water, enhances the driving effect of the horizontal momentum of the sewage entering the conditioning tank in the initial diffusion stage, effectively improves the mixing speed of the sewage and the raw water in the conditioning tank, avoids the stratification of the raw water and the sewage in the conditioning tank during mixing due to different pollution concentration gradients, shortens the non-uniform residence time of the sewage in the conditioning tank, and thus improves the pretreatment efficiency and the overall water quality control response speed. The raw water refers to the inventory of water in the conditioning tank before the external sewage is injected into the conditioning tank, which has not been discharged and is in a low load or residual state. The raw water may come from the sewage that has not been discharged in the previous treatment cycle, the backflow sludge dilution liquid or the low-pollution-degree pretreatment tail water. The water quality of the raw water is usually relatively stable, and the pollution concentration is relatively low, which is common in sewage treatment.

[0078] The determination of the mutation threshold is based on offline analysis of historical operation data of the conditioning tank, including inflow load, pollution concentration, and flow fluctuation. The statistical distribution characteristics of the load change rate of each unit area are calculated, such as the mean value μ and the standard deviation σ of the change rate under non-impact conditions. The mutation threshold is set to μ+k·σ, where k can be 2-3 to cover 95%-99% of the normal fluctuation range. When the load change rate of a certain area exceeds the threshold, it is determined that there is a real increase in pollution load.

[0079] In the step S4, each unit in the adjusting pool is divided into high load unit and low load unit by a division threshold value;

[0080] The aeration stirring device located in the high load unit is oriented in the same direction as the vertical direction, with a deflection angle of -20° to 20°, and adopts high pressure and low frequency pulse air supply;

[0081] The aeration stirring device located in the low load unit is oriented in the same direction as the vertical direction, with a deflection angle of -20° to 20°, and the aeration stirring device is closed.

[0082] After the first dispersion is completed, although the sewage and raw water have been mixed to a certain extent, due to the directionality and instantaneity of the initial impact of the sewage, it is still inevitable that the pollution load distribution is uneven in the adjusting pool, therefore, the step S4 introduces the pollution load dynamic curve as the analysis basis, divides each unit region in the adjusting pool into high load unit and low load unit, calculates the instantaneous pollution load value according to the key parameters of pollution concentration and effective water volume, and identifies the state of each region in real time through the set pollution load division threshold value;

[0083] On this basis, by regulating the working state of the aeration stirring device corresponding to each unit, including the start / closure state, air supply pressure, pulse frequency and inclination angle orientation parameters, the stirring device in the high load unit is preferentially started and adopts an enhanced disturbance strategy, such as high pressure and low frequency air supply with swing, for intensive stirring, so as to improve the diffusion and homogenization rate of pollutants in the region; and the low load unit is closed or maintained in low power consumption operation, so as to avoid energy waste or disturb the flow state, thereby further breaking the concentration gradient of pollutants in the space dimension in different regions of the adjusting pool, promoting the overall homogeneous distribution of pollution factors in the water body, and providing a basis for subsequent unified treatment.

[0084] The division threshold value can be set as a fixed division threshold value combined with engineering experience, for example, the experience value of 80 mg / L·m³ for COD load and 10 mg / L·m³ for ammonia nitrogen as the high load standard.

[0085] In the step S5, according to the pollution load of each unit region, it is determined that the pollution of the adjusting pool is in a low load state, and the aeration stirring device in the adjusting pool adopts low pressure and high frequency pulse air supply.

[0086] If all unit load values are in a low load state, it indicates that the water body has been uniformly stable, all aeration stirring devices adopt unified air supply parameters, adopt low pressure and high frequency pulse air supply, and all regions in the adjusting pool maintain mixing and oxygen supply state in a consistent manner, effectively preventing repeated system disturbance and energy waste caused by operation delay, overexposure or over stirring.

[0087] The bubbles sprayed by the aeration stirring device form a "virtual partition" to divide the adjustment tank into multiple unit areas, the bubble curtain can not only construct a stable fluid boundary in the water, but also can adjust the size and shape of the partition in real time by controlling the gas flow, frequency and angle, and through the bubble partition mechanism, different functional areas or pollution load areas can be flexibly isolated without installing physical partitions, forming disturbance units without interference, which greatly improves the directional flow field management capability of the water body.

[0088] The water flow short circuit and dead angle deposition phenomenon in the traditional aeration tank is avoided, so that the stirring and aeration of each unit are more concentrated and efficient, the mixing uniformity and oxygen transfer efficiency are improved, compared with the existing technology which generally relies on fixed partitions or overall uniform aeration, the present scheme realizes partition cascade control through variable bubble boundary, which not only reduces the investment of physical structure, but also greatly improves the energy utilization rate.

[0089] In the present application, the gas supply mode of the aeration stirring device includes: low-pressure high-frequency pulse gas supply and high-pressure low-frequency pulse gas supply.

[0090] The specific parameters in the low-pressure high-frequency pulse gas supply include: the gas source pressure range is 0.05-0.1MPa, the pulse frequency is 1-3Hz, and the pulse duration is 0.2-0.5s.

[0091] The specific parameters in the high-pressure low-frequency pulse gas supply include: the gas source pressure range is 0.15-0.25MPa, the pulse frequency is 0.1-0.5Hz, and the pulse duration is continuous gas supply.

[0092] The high-pressure low-frequency pulse gas supply is applied to the stage of core area, edge area and the like which needs to be strengthened and disturbed or promoted and diffused mixing, and this mode has the characteristics of strong thrust, deep penetration, wide water disturbance range, which helps to quickly break the stratification, promote fluid shear and convective exchange between different water bodies.

[0093] The low-pressure high-frequency pulse gas supply is applied to the synchronous treatment stage after the pollution load is balanced, and this mode focuses on energy saving, micro-disturbance maintenance and stable oxygen transmission, avoids disturbing the established stable distribution, and improves the oxygen utilization rate.

[0094] It should be noted that by setting different gas supply parameters, the aeration stirring device has a targeted action mechanism in different working scenarios, in the initial stage of pollution impact or under uneven load conditions, the high-pressure low-frequency gas supply can enhance the disturbance intensity and accelerate the spatial diffusion and pollution mixing of sewage in the tank; and in the stable stage when the load tends to be consistent, the low-pressure high-frequency pulse gas supply can realize meticulous and uniform stirring maintenance, improve the gas-liquid exchange efficiency and reduce the energy consumption; the water disturbance in the adjustment tank is neither excessive nor lost, which effectively supports the whole process regulation and control from dispersion mixing to load balancing.

[0095] In the present application, the inclination range of the aeration stirring device with the vertical direction is -60°-60°.

[0096] The present application relates to a regulating pool stirring method, which realizes the rapid mixing and diffusion of sewage and raw water by dynamically dividing the core area and the edge area and adjusting the inclination direction and the air supply mode of the aeration stirring device in real time. The verification aims to quantify the improvement effect of the method on the mixing uniformity and the diffusion speed. The core indicators include:

[0097] Mixing uniformity: evaluated by the coefficient of variation (CV) of the pollutant concentration in the unit area, and the lower the CV value, the better the uniformity.

[0098] Diffusion speed: evaluated by the sewage front diffusion time (unit: seconds), that is, the average time for sewage to diffuse from the injection point to the edge of the pool.

[0099] Comparison benchmark: traditional fixed aeration method (aeration device is installed vertically, and fixed parameter air supply).

[0100] Experimental preparation:

[0101] A. Prepare two groups of identical regulating pools, with a pool size of 20m x 10m x 4m (length x width x depth), and divide the unit grid into a 10 x 5 array (a total of 50 units, with a unit size of 2m x 2m);

[0102] Inject simulated sewage (COD=500±50mg / L, NH3-N=50±10mg / L) in the middle of the pool, with an inflow rate of 10m 3 / h, simulating a high pollution load impact.

[0103] B. Install aeration stirring devices and online water quality sensors at the bottom of each unit in the first group of regulating pools, with a device inclination of 0°-60°, connected to the air supply pipe: high-pressure low-frequency pulse air supply (pressure 0.2MPa, frequency 0.3Hz) for primary dispersion, and low-pressure high-frequency pulse air supply (pressure 0.08MPa, frequency 2Hz) for synchronous treatment (i.e., using the regulating pool stirring method of the present application) for secondary dispersion;

[0104] Install aeration stirring devices and online water quality sensors at the bottom of each unit in the second group of regulating pools, using the traditional fixed aeration method, with the aeration device installed vertically and supplied with air at a pressure of 0.2MPa continuously.

[0105] Among them, there are raw water in the first group of regulating pools and the second group of regulating pools, which is one-third of the volume of the regulating pool, and the change of sewage in the first group of regulating pools and the second group of regulating pools is monitored for 60 minutes.

[0106] Experimental data and results:

[0107] 1. Mixing performance data, as shown in Table 1.

[0108] Table 1:

[0109]

[0110] 2. Sewage treatment efficiency data, as shown in Table 2.

[0111] Table 2:

[0112]

[0113] By comparison between the first group of adjusting pools and the second group of adjusting pools, the sewage in the first group of adjusting pools has good mixing performance, mainly because the control strategy of adjusting the tilting direction of the aeration stirring device actively intervenes and disturbs the diffusion path of the sewage, so that the aeration stirring device in the core area is tilted toward the main diffusion direction of the sewage, while the edge area is reversely arranged, and the two sides form opposite stirring, thereby constructing a continuous and organized convection disturbance belt at the boundary, promoting the rapid mixing of raw water and sewage at the position of the disturbance belt, and enhancing the horizontal momentum of the sewage in the initial stage, so as to realize rapid diffusion and active disturbance, thereby forming effective mixing with the raw water in the adjusting pool in the initial stage of sewage injection, and improving the mixing speed and uniformity of the pollutants in the entire pool body.

[0114] The above is based on the ideal embodiment of the present application, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A method for stirring a regulating tank, characterized in that, Includes the following steps: Step S1: Based on the key indicators of several fan-shaped unit areas in the real-time monitoring and regulation tank, construct the pollution load dynamic curve. The key indicators include: chemical oxygen demand, ammonia nitrogen, dissolved oxygen, suspended solids, water level, and influent flow rate. Step S2: Based on the pollution load dynamic curve, the equalization tank is dynamically divided into a core area and an edge area. Specifically, the rate of change of the time series data is calculated to determine the abrupt change trend of the unit's pollution load. The pollution load in the unit area exceeds the set abrupt change threshold. The area is determined as the core zone when it is open, and otherwise as the peripheral zone when it is closed, and the boundary of the core zone expands dynamically as the sewage spreads. Step S3: Adjust the working state of the aeration and stirring device in the core area so that it is tilted towards the main diffusion direction of sewage to form horizontal disturbance. According to the dynamics of the core area boundary, adjust the working state of the aeration and stirring device in the edge area so that it is tilted towards the opposite direction of sewage diffusion to form convective disturbance with the sewage diffusion direction, and complete the first-level dispersion. There are several aeration and stirring devices, which correspond one-to-one with the unit area. Step S4: Based on the dynamic curve of the pollution load, divide the equalization tank into several unit areas into high / low load units, and control the start-up and shutdown status and working status of the aeration and stirring device in different zones to complete the secondary dispersion. Step S5: When the pollution load of each unit area meets the requirements of a low-load unit, they will all enter the synchronous aeration treatment stage.

2. The method for stirring a regulating tank according to claim 1, characterized in that: Step S1 includes the following sub-steps: Step S11: Divide the regulating pool into several units, monitor each unit separately, and normalize the obtained monitoring data. Step S12: Monitor each unit and calculate the instantaneous pollution load. ,in Indicates the pollutant concentration in region j. This represents the effective water volume of the area, and n represents the number of units. Step S13: Record the pollution load of each pollutant at different time points, generate the corresponding pollution load time series, and construct a two-dimensional time-load line graph.

3. The method for stirring a regulating tank according to claim 1, characterized in that: In step S3, In the core area, the aeration and mixing device is oriented at an angle of 30° to 60° to the direction of sewage flow. In the edge zone, the aeration and mixing device is oriented at an angle of 30° to 60° relative to the direction of sewage flow. All primary dispersion aeration and mixing devices use high-pressure, low-frequency pulse air supply.

4. The method for stirring a regulating tank according to claim 1, characterized in that: In step S4, the units in the regulating pool are divided into high-load units and low-load units by distinguishing thresholds; The aeration and stirring device located in the high-load unit is oriented in the same direction as the vertical direction, with a deflection angle of ±20°, and adopts high-pressure low-frequency pulse air supply; The aeration and stirring device located in the low-load unit is oriented in the same direction as the vertical direction, with a deflection angle of ±20°, and the aeration and stirring device is turned off.

5. The method for stirring a regulating tank according to claim 1, characterized in that: In step S5, based on the pollution load of each unit area, it is determined that the pollutants in the equalization tank are in a low-load state, and the aeration and stirring device in the equalization tank is controlled to use low-pressure high-frequency pulse air supply.

6. The method for stirring a regulating tank according to claim 1, characterized in that: The tilt angle of the aeration and stirring device ranges from -60° to 60° in the vertical direction.

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