Intelligent control method for adjustable region of wastewater treatment AOA process

Abstract

This invention relates to an intelligent control method for adjustable zones in an AOA (Adjustable Ammonia Nitrogen) process for wastewater treatment, comprising the following steps: S100, obtaining three indicators that meet the effluent requirements, namely the target ammonia nitrogen concentration - N... out Target nitrate concentration (NO) and target total phosphorus concentration (TP); S200; Obtain real-time ammonia nitrogen concentration (N) at the effluent outlet. out,t Real-time nitrate concentration NO t and real-time total phosphorus concentration (TP) t S300, Determine N out With N out,t The size of N, if out,t >N out If N, then the adjustable area is in the open state; out ≥N out,t If the adjustable area is closed, then the control is in the off state; determine NO and NO. t The size, if NO t If NO > NO, then control the dosing device to add carbon source to the adjustable zone; if NO ≥ NO t Then the dosing device will stop adding carbon source to the adjustable zone; determine TP and TP t The size of TP t If TP > TP, then control the dosing device to add phosphorus removal agent to the adjustable zone; if TP ≥ TP t If the dosing device stops adding phosphorus removal agent to the adjustable zone, the invention reduces reliance on manual experience, improves control precision, and lowers operational difficulty.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an intelligent control method for adjustable zones in an AOA (Automatic Asynchronous Activation) process for wastewater treatment. Background Technology

[0002] AOA (Anaerobic-Oxic-Anoxic) process is a highly efficient deep denitrification process for urban wastewater. Its design is based on the metabolic characteristics of different microorganisms and combines the alternation of anaerobic, aerobic and anoxic environments to achieve efficient degradation of organic matter and nitrogen and phosphorus in wastewater. It has the advantages of high efficiency and low consumption.

[0003] In the traditional AOA process, wastewater first enters the anaerobic zone, where, with the assistance of a stirring device, anaerobic degradation of organic matter and phosphorus release occur, converting large organic molecules into smaller ones and intracellular carbon sources. It then flows into the aerobic zone, where nitrification occurs with the aid of an aeration device, converting ammonia nitrogen into nitrate nitrogen. Afterward, the sludge-water mixture enters the anoxic zone, where denitrification occurs with the aid of a stirring device, reducing nitrates to nitrogen gas, thus achieving nitrogen removal.

[0004] Existing AOA (Automatic Aeration) processes rely heavily on manual experience in controlling pollution removal equipment such as mixing and aeration devices, making precise and intelligent control difficult. This results in significant fluctuations in treatment efficiency and high energy consumption. Therefore, to improve the adaptability of this process across different temperature and water concentration ranges, further optimization of its control methods is needed. Summary of the Invention

[0005] To address the aforementioned shortcomings, this invention proposes an intelligent control method for the adjustable zone of an AOA process in wastewater treatment.

[0006] The technical solution adopted in this invention is an intelligent control method for an adjustable zone in an AOA (Automatic Aeration) process for wastewater treatment. The adjustable zone has an outlet end and is equipped with an aeration device, a stirring device, and a dosing device. When the aeration device is turned on to a first air volume and the stirring device is at a first stirring frequency, the adjustable zone is in an open state. When the aeration device is turned off and the stirring device is at a second stirring frequency, the adjustable zone is in a closed state. The second stirring frequency is greater than the first stirring frequency.

[0007] The adjustable zone intelligent control method includes the following steps:

[0008] S100. Obtain three indicators that meet the effluent requirements, namely the target ammonia nitrogen concentration - N. out Target nitrate concentration (NO) and target total phosphorus concentration (TP);

[0009] S200, Obtain the real-time ammonia nitrogen concentration (N) at the outlet water end.out,t Real-time nitrate concentration NO t and real-time total phosphorus concentration (TP) t ;

[0010] S300, according to the N out NO, TP, N out,t NO t and TP t Control the adjustable zone to be in an open or closed state, and control the dosing device.

[0011] Preferably, step S300 specifically includes the following steps:

[0012] Determine N out With N out,t The size of N, if out,t >N out Then the adjustable area is controlled to be in the open state; if N out ≥N out,t Then the adjustable area is controlled to be in the closed state;

[0013] Determine NO and NO t The size, if NO t If NO > NO, then control the dosing device to add a carbon source to the adjustable zone; if NO ≥ NO t If so, the dosing device is controlled to stop adding carbon source to the adjustable zone;

[0014] Determine TP and TP t The size of TP t If TP > TP, then the dosing device is controlled to add phosphorus removal agent to the adjustable zone; if TP ≥ TP t If the dosing device is activated, it will stop adding phosphorus removal agent to the adjustable zone.

[0015] Preferably, N out The concentrations ranged from 1.0 mg / L to 2.0 mg / L, NO was 6.0 mg / L, and TP was 0.5 mg / L.

[0016] Preferably, after S300, the method further includes the following steps: S400, repeating S200 and S300 once every time interval t.

[0017] Preferably, 2h≤t≤12h.

[0018] Preferably, the adjustable zone also has a water inlet end;

[0019] The S100 further includes: obtaining three indicators that meet the influent requirements, namely the target organic matter concentration C, the target ammonia nitrogen concentration N. in and target temperature T;

[0020] The S200 further includes: acquiring the real-time organic matter concentration C at the water inlet. t Real-time ammonia nitrogen concentration (N) in,t and real-time temperature T t ;

[0021] The S300 includes: according to N out NO, TP, C, N in , T, and N out,t NO t and TP t C t N in,t T t Control the adjustable zone to be in an open or closed state, and control the dosing device.

[0022] Preferably, S300 specifically includes:

[0023] Simultaneously determine N out and N out,t Size, C and C t Size, N in and N in,t Size, and T and T t The size of N, if out,t >N out C t >C, N in,t >N in or T t If N < T, then the adjustable area is in the open state; if N < T < T, then the adjustable area is in the open state. out,t ≤N out C t ≤C、N in,t ≤N in And T t If the value is ≥T, then the adjustable area is controlled to be in a closed state;

[0024] Determine NO and NO t The size, if NO t If NO > NO, then control the dosing device to add a carbon source to the adjustable zone; if NO ≥ NO t If so, the dosing device is controlled to stop adding carbon source to the adjustable zone;

[0025] Determine TP and TP t The size of TP t If TP > TP, then the dosing device is controlled to add phosphorus removal agent to the adjustable zone; if TP ≥ TP t If the dosing device is activated, it will stop adding phosphorus removal agent to the adjustable zone.

[0026] Preferably, the N outC, N in Both and T are interval values;

[0027] The adjustable zone also has an intermediate state. When the adjustable zone is in the intermediate state, the air volume of the aeration device decreases step by step from the first air volume, and the stirring frequency of the stirring device increases step by step from the first stirring frequency to the second stirring frequency.

[0028] Specifically, S300 includes:

[0029] Simultaneously determine N out and N out,t Size, C and C t Size, N in and N in,t Size, and T and T t The size of N, if out,t >N out C t >C, N in,t >N in or T t If N < T, then the adjustable area is in the open state; if N < T < T, then the adjustable area is in the open state. out,t <N out C t <C, N in,t <N in And T t If N > T, then the adjustable area is in the closed state; if N > T, then the adjustable area is in the closed state. out,t ∈N out C t ∈C、N in,t ∈N in And T t If ∈T, then the adjustable region is controlled to be in the intermediate state;

[0030] Determine NO and NO t The size, if NO t If NO > NO, then control the dosing device to add a carbon source to the adjustable zone; if NO ≥ NO t If so, the dosing device is controlled to stop adding carbon source to the adjustable zone;

[0031] Determine TP and TP t The size of TP t If TP > TP, then the dosing device is controlled to add phosphorus removal agent to the adjustable zone; if TP ≥ TP t If the dosing device is activated, it will stop adding phosphorus removal agent to the adjustable zone.

[0032] Preferably, the air volume of the aeration device decreases in a step-by-step manner from the first air volume, and the stirring frequency of the stirring device increases in a step-by-step manner from the first stirring frequency to the second stirring frequency, specifically including:

[0033] Obtain the real-time dissolved oxygen concentration of the adjustable zone;

[0034] Input the real-time dissolved oxygen concentration into the ASM2D model, and the ASM2D model generates a step-by-step variation scheme for the aeration air volume of the aeration device and the stirring frequency of the stirring device.

[0035] The air volume of the aeration device decreases stepwise from the first air volume based on the step-change scheme, and the stirring frequency of the stirring device increases stepwise from the first stirring frequency to the second stirring frequency based on the step-change scheme.

[0036] Preferably, C is 100 mg / L to 500 mg / L, and N... in The concentration ranges from 15 mg / L to 65 mg / L, and the temperature ranges from 12°C to 30°C.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. The intelligent control method for adjustable zones in the wastewater treatment AOA process of this invention ensures stable treatment results even under changing conditions by real-time monitoring and adjusting the working status of aeration, stirring, and dosing devices according to water quality. Automatic adjustment of the adjustable zone status and dosing devices avoids unnecessary energy consumption and reagent waste, improving the economy of the wastewater treatment system. Using this intelligent control method reduces reliance on manual experience, improves control accuracy, and lowers the difficulty of operation.

[0039] 2. The intelligent control method in this invention can achieve more precise control of the sewage treatment process by simultaneously acquiring multiple key indicators from the inlet and outlet. The sewage treatment process can adjust operating parameters more intelligently and precisely, ensuring stable sewage treatment effect, energy saving and consumption reduction, and the ability to cope with different water quality fluctuations and environmental changes. Attached Figure Description

[0040] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0041] Figure 1 This is a flowchart of an intelligent control method for the adjustable zone of an AOA process in wastewater treatment, as described in one embodiment.

[0042] Figure 2 This is a flowchart of an adjustable zone intelligent control method for the wastewater treatment AOA process in another embodiment. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0044] In one embodiment, an intelligent control method for an adjustable zone in a wastewater treatment AOA process is provided. This adjustable zone can be located between the anaerobic and aerobic zones, or between the aerobic and anoxic zones, to supplement and transition the functions of the upstream and downstream zones. The adjustable zone is equipped with aeration devices, stirring devices, and chemical dosing devices, thus providing air supply, stirring, and chemical dosing functions. It can flexibly adjust the operating status of each device within the zone according to changes in influent and effluent water quality and operating conditions, optimizing wastewater treatment efficiency and ensuring stable effluent quality compliance. The adjustable zone has an effluent outlet, and the water quality at the outlet can be monitored in real time by a monitoring device. The adjustable zone has an open state and a closed state. When the aeration device is turned on to the first air volume and the stirring device is at the first stirring frequency, the adjustable zone is in the open state. When the aeration device is turned off and the stirring device is at the second stirring frequency, the adjustable zone is in the closed state. When the second stirring frequency is greater than the first stirring frequency, that is, when the adjustable zone switches from the closed state to the open state, the aeration device switches from not supplying air to supplying air at the first air volume, and the air supply increases. The stirring device decreases from the second stirring frequency to the first stirring frequency, and the stirring slows down.

[0045] Based on the aforementioned adjustable zone of the wastewater treatment AOA process, such as Figure 1 As shown, a method for intelligent control of the adjustable zone in an AOA (Automatic Asynchronous Activation) process for wastewater treatment includes the following steps:

[0046] S100. Obtain three indicators that meet the effluent requirements, namely the target ammonia nitrogen concentration - N. out The target nitrate concentration (NO) and the target total phosphorus concentration (TP) are determined.

[0047] Ammonia nitrogen is a source of nitrogen in wastewater, typically produced by the decomposition of urea and protein in human and animal excrement. High concentrations of ammonia nitrogen can pollute water bodies, leading to eutrophication and threatening the survival of aquatic organisms. Nitrate is an intermediate product of ammonia nitrogen produced by nitrifying bacteria in aerobic zones. Nitrate concentrations need to be controlled to prevent impacts on aquatic ecosystems. Total phosphorus includes organic and inorganic phosphorus (such as orthophosphate). Phosphorus is one of the main factors causing eutrophication; excessive phosphorus leads to algal blooms and damages the aquatic ecosystem.

[0048] N outNO and TP are three indicators that represent the ideal effluent quality after wastewater treatment. They are set based on environmental standards or specific process requirements. By pre-setting target parameters, it is ensured that the effluent indicators in the wastewater treatment process meet the discharge standards or specific requirements, making the control more precise.

[0049] S200, Obtain the real-time ammonia nitrogen concentration at the outlet water level - N out,t Real-time nitrate concentration NO t and real-time total phosphorus concentration (TP) t Real-time monitoring values ​​are compared with target values ​​to determine the adjustment direction of the adjustable zone. Real-time monitoring of key effluent water quality indicators provides dynamic feedback, enabling automatic control of aeration, mixing, and chemical dosing to ensure the stability and accuracy of the water treatment process. Real-time ammonia nitrogen concentration (N...) out,t Real-time nitrate concentration NO t and real-time total phosphorus concentration (TP) t It can be monitored in real time using online sensors and analytical instruments.

[0050] S300, according to N out NO, TP, N out,t NO t and TP t Controls the adjustable zone to be in the open or closed state, and controls the dosing device.

[0051] The intelligent control method for the adjustable zone of the wastewater treatment AOA process in this embodiment ensures stable treatment results even under changing conditions by real-time monitoring and adjusting the working status of aeration, stirring, and dosing devices according to water quality. Automatic adjustment of the adjustable zone status and dosing devices avoids unnecessary energy consumption and reagent waste, improving the economy of the wastewater treatment system. Using this intelligent control method reduces reliance on manual experience, improves control accuracy, and lowers operational difficulty.

[0052] In one embodiment, such as Figure 1 As shown, S300 specifically includes the following steps:

[0053] S310, Determine N out With N out,t The size of N, if out,t >N out Then the adjustable area is controlled to be in the open state; if N out ≥N out,t If so, the adjustable area is controlled to be in the closed state.

[0054] If N out,t >N outThis indicates that the ammonia nitrogen concentration in the wastewater is too high, resulting in insufficient treatment effectiveness. Therefore, the adjustable zone should be kept open to increase aeration and reduce stirring frequency, providing an oxygen-rich environment to promote nitrification. Through the action of nitrifying bacteria, ammonia nitrogen in the wastewater is converted into nitrate, thereby accelerating ammonia nitrogen removal. If N... out ≥N out,t This indicates that the ammonia nitrogen concentration has reached or fallen below the target value. At this point, the adjustable control zone is closed, aeration is stopped, and the stirring frequency is increased to provide an anaerobic environment, facilitating the removal of nitrates, a byproduct of nitrification. The aeration and stirring intensity are dynamically adjusted based on real-time fluctuations in ammonia nitrogen concentration to prevent ammonia nitrogen levels from exceeding the standard, while saving energy and ensuring stable and efficient treatment results.

[0055] S320, Determine whether NO or NO t The size, if NO t If NO > NO, then control the dosing device to add a carbon source to the adjustable zone; if NO ≥ NO t If so, the dosing device will stop adding carbon source to the adjustable zone.

[0056] If NO t >NO indicates that the nitrate concentration is too high and the denitrification capacity is insufficient. A carbon source needs to be added to promote the denitrification reaction, and the carbon source should be controlled to be added to the adjustable zone using the dosing device. If NO ≥ NO t This indicates that the nitrate concentration is low, and the carbon source supply is sufficient or excessive. At this point, carbon source addition should be stopped. Adjusting the carbon source dosage based on the real-time nitrate concentration ensures the smooth progress of the denitrification reaction, effectively reduces nitrate concentration, avoids waste due to excessive carbon source addition, and optimizes operating costs. Carbon sources can be organic substances provided to microorganisms, such as acetic acid, methanol, glucose, and ethanol.

[0057] S330, Determine TP and TP t The size of TP t If TP > TP, then the dosing device is controlled to add phosphorus removal agent to the adjustable zone; if TP ≥ TP t If the dosing device is activated, it will stop adding phosphorus removal agent to the adjustable zone.

[0058] If TP t If TP > TP, it indicates that the total phosphorus concentration exceeds the standard, requiring the addition of phosphorus removal agent for chemical phosphorus removal. The dosing device should be controlled to add phosphorus removal agent to the adjustable zone. If TP ≥ TP tThis indicates a low total phosphorus concentration, and the addition of phosphorus removal agent should be stopped to avoid excessive chemical dosage. By monitoring the total phosphorus concentration in real time and dynamically adjusting the dosage of phosphorus removal agent, the phosphorus concentration can be kept within a reasonable range, reducing the use of chemical agents, avoiding resource waste, and reducing environmental pollution. Phosphorus removal agents can be ferrous salts (such as ferrous sulfate and ferric chloride), aluminum salts (such as aluminum sulfate and aluminum chloride), calcium salts (such as lime Ca(OH)2), and other chemical substances used to remove phosphorus from wastewater.

[0059] In a preferred embodiment, step S320 is performed after S310 to remove the nitrate produced in step S310. Step S330 can be performed before or after step S310 or S320.

[0060] In one embodiment, to comply with environmental emission standards, avoid eutrophication, and save energy, N out The concentrations ranged from 1.0 mg / L to 2.0 mg / L, NO was 6.0 mg / L, and TP was 0.5 mg / L.

[0061] In one embodiment, after step S300, the following steps are also included: S400, repeating S200 and S300 every time interval t. By setting a time interval t, various parameters of wastewater treatment can be continuously monitored, avoiding data lag and ensuring that the wastewater treatment process is always under control. Aeration, stirring, and dosing devices can be dynamically adjusted to maximize treatment efficiency, flexibly respond to different water quality changes, achieve highly efficient pollutant removal, and ensure that the effluent consistently meets discharge standards. Simultaneously, repeating adjustments at set time intervals t avoids excessive continuous aeration and stirring operations, reducing unnecessary energy consumption. Furthermore, automatic adjustments at fixed time intervals t can significantly reduce manual intervention, lower labor costs, and improve the intelligence and automation level of the treatment process.

[0062] In one embodiment, 2h ≤ t ≤ 12h. When wastewater quality fluctuates significantly or the treatment load is high, choosing a shorter interval (e.g., 2h) allows for rapid response and adjustment of equipment operation; conversely, when water quality is stable, choosing a longer interval (e.g., 12h) reduces frequent equipment start-ups and shutdowns, extending equipment lifespan. By setting the time interval to 2h ≤ t ≤ 12h, efficient, energy-saving, and stable wastewater treatment results can be achieved.

[0063] In one embodiment, the adjustable zone also has a water inlet, such as Figure 2 As shown,

[0064] S100 also includes: obtaining three indicators to meet the influent requirements, namely the target organic matter concentration C, the target ammonia nitrogen concentration N. in and target temperature T.

[0065] The target organic matter concentration C refers to the target organic matter concentration in the wastewater entering the adjustable zone, used to characterize the amount of organic pollutant load. The target ammonia nitrogen concentration N... in The target ammonia nitrogen concentration in wastewater reflects the level of nitrogen pollutants. The target temperature T refers to the target temperature for the treatment process, used to ensure the normal operation of biological reactions.

[0066] S200 also includes: acquiring the real-time organic matter concentration C at the inlet water end. t Real-time ammonia nitrogen concentration (N) in,t and real-time temperature T t Real-time organic matter concentration C t Real-time ammonia nitrogen concentration (N) in, The real-time temperature T is obtained by monitoring with a temperature sensor through real-time monitoring equipment.

[0067] S300 includes: according to N out NO, TP, C, N in , T, and N out,t NO t and TP t C t N in,t T t Control the adjustable zone to be in the open or closed state, and control the dosing device. Analyze the differences in these indicators to ensure that the aeration, mixing, and dosing devices in the treatment process can be adjusted according to the real-time influent and effluent conditions of the adjustable zone.

[0068] The intelligent control method in this embodiment can achieve more precise control of the sewage treatment process by simultaneously acquiring multiple key indicators from both the inlet and outlet. The sewage treatment process can adjust operating parameters more intelligently and precisely, ensuring stable sewage treatment effect, energy saving and consumption reduction, and the ability to cope with different water quality fluctuations and environmental changes.

[0069] In one embodiment, step S300 specifically includes:

[0070] S310, Simultaneously determine N out and N out,t Size, C and C t Size, N in and N in,t Size, and T and T t The size of N, if out,t >N out C t >C, N in,t >N in or T t If N < T, then the adjustable area is in the open state; if N < T < T, then the adjustable area is in the open state. out,t ≤N out Ct ≤C、N in,t ≤N in And T t If the value is greater than or equal to T, then the adjustable area is controlled to be in a closed state.

[0071] If N out,t >N out C t >C, N in,t >N in or T t <T indicates that the concentration of ammonia nitrogen in the effluent is high, the concentration of organic pollutants in the influent is high, or the temperature is low. In this case, the adjustable zone is in the open state. By starting the aeration device to supply air and reducing the stirring frequency of the stirring device, the concentration of ammonia nitrogen and organic pollutants in the adjustable zone is reduced and the temperature is increased, thereby improving the sewage treatment effect.

[0072] If N out,t ≤N out C t ≤C、N in,t ≤N in And T t If ≥T, it means that the ammonia nitrogen concentration in the outflow is lower than or equal to the target ammonia nitrogen concentration 1, the organic pollutant concentration in the inflow is lower than or equal to the target organic pollutant concentration, the ammonia nitrogen concentration in the inflow is lower than or equal to the target ammonia nitrogen concentration 2, and the temperature is higher than or equal to the target temperature. The water quality indicators have reached the expected level. At this time, the controllable zone is in the closed state, which effectively avoids overtreatment, saves energy and extends the equipment life, and keeps the water quality within a stable and controllable range.

[0073] S320, Determine whether NO or NO t The size, if NO t If NO > NO, then control the dosing device to add a carbon source to the adjustable zone; if NO ≥ NO t If so, the dosing device will stop adding carbon source to the adjustable zone.

[0074] S330, Determine TP and TP t The size of TP t If TP > TP, then the dosing device is controlled to add phosphorus removal agent to the adjustable zone; if TP ≥ TP t If the dosing device is activated, it will stop adding phosphorus removal agent to the adjustable zone.

[0075] Steps S320 and S330 are the same as those in the previous embodiments.

[0076] In one embodiment, N out C, N in Both and T are interval values;

[0077] The adjustable zone also has an intermediate state. When the adjustable zone is in the intermediate state, the air volume of the aeration device decreases step by step from the first air volume, and the stirring frequency of the stirring device increases step by step from the first stirring frequency to the second stirring frequency.

[0078] like Figure 2 As shown, S300 specifically includes:

[0079] S310, Simultaneously determine N out and N out,t Size, C and C t Size, N in and N in,t Size, and T and T t The size of N, if out,t >N out C t >C, N in,t >N in or T t If N < T, then the adjustable control area is in the open state; if N < T < T, then the adjustable control area is in the open state. out,t <N out C t <C, N in,t <N in And T t If N > T, then the adjustable control area is in the off state; if N > T, then the adjustable control area is in the off state. out,t ∈N out C t ∈C、N in,t ∈N in And T t If ∈T, then the controllable region is in an intermediate state.

[0080] By setting intermediate states, the system can dynamically adjust aeration and stirring according to actual conditions, achieving more precise control. Changes in the treatment process can be responded to more sensitively, thus avoiding over- or under-treatment and ensuring the stability of the treatment effect. The gradual adjustment method is more efficient than a single on or off state, reducing unnecessary energy consumption.

[0081] S320, Determine NO and NO t The size, if NO t If NO > NO, then control the dosing device to add a carbon source to the adjustable zone; if NO ≥ NO t If so, the dosing device will stop adding carbon source to the adjustable zone.

[0082] S330, Determine TP and TP t The size of TP t If TP > TP, then the dosing device is controlled to add phosphorus removal agent to the adjustable zone; if TP ≥ TP t If the dosing device is activated, it will stop adding phosphorus removal agent to the adjustable zone.

[0083] Steps S320 and S330 are the same as those in the previous embodiments.

[0084] In one embodiment, the air volume of the aeration device decreases in a first step, and the stirring frequency of the stirring device increases in a second step from a first stirring frequency, specifically including:

[0085] Obtain the real-time dissolved oxygen concentration in the adjustable zone. Dissolved oxygen concentration reflects the oxygen demand of microorganisms in the adjustable zone and is an important basis for judging aeration requirements and stirring intensity. It can be obtained through dissolved oxygen sensors.

[0086] The real-time dissolved oxygen concentration is input into the ASM2D model, which then generates step-by-step adjustment schemes for the aeration airflow of the aeration device and the stirring frequency of the stirring device. The ASM2D model is a mathematical model based on activated sludge processes, capable of simulating the interactions between different parameters in wastewater treatment. Based on the input dissolved oxygen concentration, the model generates adjustment schemes for the aeration airflow of the aeration device and the stirring frequency of the stirring device, enabling the system to balance oxygen supply and stirring requirements.

[0087] The aeration device's airflow decreases in stages based on a step-change scheme, starting from a first airflow rate. Similarly, the agitation device's frequency increases in stages based on a step-change scheme, starting from a first agitation frequency and progressing to a second agitation frequency. The aeration device's airflow, generated by the ASM2D model, gradually decreases from an initial first airflow rate. This reduction can be linear or non-linear, depending on the processing requirements reflected by the model. The agitation device's frequency gradually increases from an initial first agitation frequency until it reaches a second agitation frequency. Increasing the agitation frequency aims to expel gas during aeration while ensuring thorough mixing of sludge and water, preventing sludge sedimentation.

[0088] The intelligent control method in this embodiment, through calculation using the ASM2D model and real-time feedback of dissolved oxygen concentration, can accurately match the aeration intensity according to the treatment requirements, improve stirring efficiency, and achieve significant energy-saving effects, so that the entire wastewater treatment process can achieve optimal resource utilization while ensuring that water quality meets standards.

[0089] In one embodiment, C is from 100 mg / L to 500 mg / L, N in The concentration ranges from 15 mg / L to 65 mg / L, and the temperature ranges from 12℃ to 30℃. By controlling the state of the adjustable zone based on these three inlet parameters, microbial activity can be optimized, wastewater treatment efficiency can be improved, and resources and costs can be saved.

[0090] In the description of this specification, the use of terms such as "Embodiment 1," "this embodiment," or "in one embodiment" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example; moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in one or more embodiments or examples.

[0091] In the description of this specification, the terms "connection," "installation," "fixing," "setting," and "having" are interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0092] In the description of this specification, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0093] The above description of the embodiments is intended to enable those skilled in the art to understand and apply the technology of this invention. Those skilled in the art can readily make various modifications to these examples and apply the general principles described herein to other embodiments without creative effort. Therefore, this invention is not limited to the above embodiments. Modifications in the following situations should be within the scope of protection of this invention: ① New technical solutions implemented based on the technical solution of this invention and combined with existing common knowledge, where the technical effects of the new technical solution do not exceed the technical effects of this invention; ② Equivalent substitutions of some features of the technical solution of this invention using known technology, resulting in the same technical effects as those of this invention; ③ Extendable technical solutions based on the technical solution of this invention, where the substantive content of the extended technical solution does not exceed the technical solution of this invention; ④ Equivalent transformations made using the content of this specification and drawings, directly or indirectly applied to other related technical fields.

Claims

1. A method for intelligent control of adjustable zones in an AOA (Automatic Asynchronous Activation) process for wastewater treatment, characterized in that, The adjustable zone is located between the anaerobic zone and the aerobic zone, or between the aerobic zone and the anoxic zone. The adjustable zone has an outlet end and an inlet end, and is equipped with an aeration device, a stirring device, and a dosing device. When the aeration device is turned on to a first airflow rate and the stirring device is at a first stirring frequency, the adjustable zone is in the open state. When the aeration device is turned off and the stirring device is at a second stirring frequency, the adjustable zone is in the closed state. The second stirring frequency is greater than the first stirring frequency. The adjustable zone also has an intermediate state. When the adjustable zone is in the intermediate state, the airflow rate of the aeration device decreases step-by-step from the first airflow rate, and the stirring frequency of the stirring device increases step-by-step from the first stirring frequency to the second stirring frequency. The adjustable zone intelligent control method includes the following steps: S100. Obtain three indicators that meet the effluent requirements, namely the target ammonia nitrogen concentration - N. out The target nitrate concentration (NO) and target total phosphorus concentration (TP) are determined; three indicators to meet the influent requirements are obtained, namely the target organic matter concentration (C), the target ammonia nitrogen concentration (N), and the target total phosphorus concentration (TP). in and target temperature T; S200, Obtain the real-time ammonia nitrogen concentration (N) at the outlet water end. out,t Real-time nitrate concentration NO t and real-time total phosphorus concentration (TP) t ; Obtain the real-time organic matter concentration C at the water inlet. t Real-time ammonia nitrogen concentration (N) in,t and real-time temperature T t ; S300, according to the N out NO, TP, C, N in T, N out,t NO t TP t C t N in,t 、 and T t Controlling the adjustable zone to be in an open state, a closed state, or an intermediate state, and controlling the dosing device; The N out C, N in Both and T are interval values; S300 specifically includes: Simultaneously determine N out and N out,t Size, C and C t Size, N in and N in,t Size, and T and T t The size of N, if out,t >N out C t >C, N in,t >N in or T t If N < T, then the adjustable area is in the open state; if N < T < T, then the adjustable area is in the open state. out,t <N out C t <C, N in,t <N in And T t If N > T, then the adjustable area is in the closed state; if N > T, then the adjustable area is in the closed state. out,t ∈N out C t ∈C、N in,t ∈N in And T t If ∈T, then the adjustable region is controlled to be in the intermediate state; Determine NO and NO t The size, if NO t If NO > NO, then control the dosing device to add a carbon source to the adjustable zone; if NO ≥ NO t If so, the dosing device is controlled to stop adding carbon source to the adjustable zone; Determine TP and TP t The size of TP t If TP > TP, then the dosing device is controlled to add phosphorus removal agent to the adjustable zone; if TP ≥ TP t If the dosing device is activated, it will stop adding phosphorus removal agent to the adjustable zone.

2. The control method according to claim 1, characterized in that, N out The concentrations ranged from 1.0 mg / L to 2.0 mg / L, NO was 6.0 mg / L, and TP was 0.5 mg / L.

3. The control method according to claim 1, characterized in that, Following S300, the method further includes the following steps: S400, repeating S200 and S300 once every time interval t.

4. The control method according to claim 3, characterized in that, 2h≤t≤12h.

5. The control method according to claim 1, characterized in that, C is 100 mg / L to 500 mg / L, N in The concentration ranges from 15 mg / L to 65 mg / L, and the temperature ranges from 12 ℃ to 30 ℃.

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