Intelligent control method for adjustable area of sewage treatment AOA process

Abstract

The invention relates to a sewage treatment AOA process adjustable area intelligent control method, which comprises the following steps: S100, obtaining three indexes meeting water outlet requirements, namely a target ammonia nitrogen concentration Nout, a target nitrate concentration NO and a target total phosphorus concentration TP; s200, the real-time ammonia nitrogen concentration I Nout, t, the real-time nitrate concentration Nat and the real-time total phosphorus concentration TPt of the water outlet end are obtained; s300, the size of Nout and the size of Nout and t are judged, and if Nout and t are larger than Nout, the adjustable area is controlled to be in the open state; if Nout is larger than or equal to Nout, t, the adjustable area is controlled to be in a closed state; the sizes of NO and NO are judged, and if NO is larger than NO, the dosing device is controlled to add a carbon source to the adjustable area; if NO is greater than or equal to NOt, controlling the dosing device to stop adding the carbon source to the adjustable area; the sizes of TP and TPt are judged, and if TP is larger than TP, a chemical adding device is controlled to add a phosphorus removing agent into the adjustable area; if TP is larger than or equal to TPt, the dosing device is controlled to stop adding the phosphorus removal agent into the adjustable area. According to the method, the dependence on artificial experience is reduced, the control precision is improved, and the operation difficulty is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to an intelligent control method for an adjustable zone of an AOA process of sewage treatment. Background Art

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

[0003] In the traditional AOA process, sewage first enters the anaerobic zone, where the anaerobic degradation of organic matter and the release of phosphorus are completed with the assistance of a stirring device, and macromolecular organic matter is converted into small molecular organic matter and intracellular carbon sources. It then flows into the aerobic zone, where nitrification is carried out with the assistance of an aeration device, and ammonia nitrogen is converted into nitrate nitrogen. After that, the mud-water mixture enters the anoxic zone, where the denitrification reaction is completed with the assistance of a stirring device, thereby reducing nitrates to nitrogen gas and achieving a denitrification effect.

[0004] The existing AOA process mainly relies on manual experience in the control of the agitator, aerator and other pollution removal equipment, which makes it difficult to achieve accurate and intelligent control. There are problems such as large fluctuations in treatment effect and high energy consumption. Therefore, in order to improve the adaptability of the process in different temperature and water quality concentration ranges, it is necessary to further optimize its control method. Summary of the invention

[0005] In order to solve the above-mentioned defects, the present invention proposes an intelligent control method for adjustable zone of AOA process of sewage treatment.

[0006] The technical solution adopted by the present invention is an intelligent control method for an adjustable zone of an AOA process for sewage treatment, wherein the adjustable zone has a water outlet and is provided 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 comprises the following steps:

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

[0009] S200, obtaining the real-time ammonia nitrogen concentration N at the water outletout,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 The adjustable area is controlled to be in an open state or a closed state, and the drug adding device is controlled.

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

[0012] Judge N out With N out,t The size of N 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 a closed state;

[0013] Judging NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , then controlling the dosing device to stop adding the carbon source to the adjustable area;

[0014] Determine TP and TP t The size of TP t >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

[0015] Preferably, N out It is 1.0mg / L to 2.0mg / L, NO is 6.0mg / L, and TP is 0.5mg / L.

[0016] Preferably, after S300, the following steps are further included: S400, repeatedly executing S200 and S300 at every interval t.

[0017] Preferably, 2h≤t≤12h.

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

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

[0020] The step S200 also includes: obtaining the real-time organic matter concentration C at the water inlet. t , Real-time ammonia nitrogen concentration 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 The adjustable area is controlled to be in an open state or a closed state, and the drug adding device is controlled.

[0022] Preferably, the S300 specifically includes:

[0023] At the same time, judge N out and N out,t Size, C and C t The size of N in and N in,t The size of T and T t The size of N out,t >N out , C t >C、N in,t >N in or T t <T, the adjustable area is controlled to be in the open state; if N out,t ≤N out , C t ≤C、N in,t ≤N in And T t ≥T, the adjustable area is controlled to be in a closed state;

[0024] Judging NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , then controlling the dosing device to stop adding the carbon source to the adjustable area;

[0025] Determine TP and TP t The size of TP t >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

[0026] Preferably, the N out, C, N in , and T are all 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 is gradually reduced from the first air volume, and the stirring frequency of the stirring device is gradually increased from the first stirring frequency to the second stirring frequency.

[0028] The S300 specifically includes:

[0029] At the same time, judge N out and N out,t Size, C and C t The size of N in and N in,t The size of T and T t The size of N out,t >N out , C t >C、N in,t >N in or T t <T, the adjustable area is controlled to be in the open state; if N out,t <N out , C t <C、N in,t <N in And T t >T, the adjustable area is controlled to be in a closed state; if N out,t ∈N out , C t ∈C, N in,t ∈N in And T t ∈T, the adjustable area is controlled to be in an intermediate state;

[0030] Judging NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , then controlling the dosing device to stop adding the carbon source to the adjustable area;

[0031] Determine TP and TP t The size of TP t >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

[0032] Preferably, the air volume of the aeration device is gradually reduced from the first air volume, and the stirring frequency of the stirring device is gradually increased from the first stirring frequency to the second stirring frequency, specifically including:

[0033] Obtaining real-time dissolved oxygen concentration in the adjustable zone;

[0034] Input the real-time dissolved oxygen concentration into the ASM2D model, and the ASM2D model generates a step-by-step change plan of the aeration air volume of the aeration device and the stirring frequency of the stirring device;

[0035] The air volume of the aeration device is step-wise reduced from the first air volume based on the step-by-step variation scheme, and the stirring frequency of the stirring device is step-wise increased from the first stirring frequency to a second stirring frequency based on the step-by-step variation scheme.

[0036] Preferably, C is 100 mg / L to 500 mg / L, N in The pH value is 15mg / L to 65mg / L, and T is 12℃ to 30℃.

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

[0038] 1. The intelligent control method for the adjustable zone of the AOA process of sewage treatment in the present invention ensures that a stable treatment effect can be maintained under changing working conditions by real-time monitoring and adjusting the working status of the aeration, stirring and dosing devices according to the water quality conditions; automatically adjusts the status of the adjustable zone and the dosing device to avoid unnecessary energy consumption and waste of chemicals, and improves the economy of the sewage treatment system; by using this intelligent control method, the dependence on manual experience is reduced, the control accuracy is improved, and the difficulty of operation is reduced.

[0039] 2. The intelligent control method of the present invention can achieve more accurate regulation of the sewage treatment process by simultaneously acquiring multiple key indicators at the water inlet and outlet ends. The sewage treatment process can adjust the operating parameters more intelligently and finely to ensure stable sewage treatment effects, energy saving and consumption reduction, and the ability to cope with different water quality fluctuations and environmental changes. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0041] Figure 1 is a flow chart of an intelligent control method for an adjustable zone of an AOA process for sewage treatment in an embodiment;

[0042] Figure 2 It is a flow chart of an intelligent control method for an adjustable zone of an AOA process for sewage treatment in another embodiment. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0044] In one embodiment, a method for intelligently controlling an adjustable zone of an AOA process for sewage treatment is provided, which is used for an adjustable zone of an AOA process for sewage treatment. The adjustable zone can be set between an anaerobic zone and an aerobic zone, or between an aerobic zone and an anoxic zone, to supplement and transition the functions of the upstream and downstream functional zones. The adjustable zone is provided with an aeration device, a stirring device and a dosing device, so that the adjustable zone has the functions of air supply, stirring and dosing. It can flexibly adjust the working state of each device in the zone according to the changes in the inlet and outlet water quality and working conditions, optimize the sewage treatment effect, and ensure that the outlet water quality is stable and meets the standards. The adjustable zone has an outlet end, and the water quality state of the outlet end can be monitored in real time by the 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; 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 no air supply to air supply 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 above-mentioned AOA process adjustable area for wastewater treatment, such as Figure 1 As shown, a sewage treatment AOA process adjustable zone intelligent control method comprises the following steps:

[0046] S100, obtain three indicators that meet the effluent requirements, namely target ammonia nitrogen concentration - N out , target nitrate concentration NO and target total phosphorus concentration TP.

[0047] Ammonia nitrogen is the source of nitrogen in sewage, usually produced by the decomposition of urea, protein, etc. in human and animal excrement. High concentrations of ammonia nitrogen can pollute water bodies, lead to eutrophication and threaten the survival of aquatic organisms. Nitrate is an intermediate product produced by ammonia nitrogen in aerobic areas through the action of nitrifying bacteria. The concentration of nitrate needs to be controlled to prevent impacts on the aquatic ecosystem. Total phosphorus includes organic phosphorus and inorganic phosphorus (such as orthophosphate). Phosphorus is one of the main factors that cause eutrophication of water bodies. Excessive phosphorus can cause algae to reproduce in large numbers and damage the aquatic ecological environment.

[0048] N out, NO and TP are three indicators that represent the ideal effluent water quality after sewage treatment. They are set based on environmental protection standards or specific process requirements. By presetting target parameters, they ensure that the effluent indicators in the sewage treatment process meet emission standards or specific requirements, making control more precise.

[0049] S200, obtain the real-time ammonia nitrogen concentration at the outlet out,t , real-time nitrate concentration NO t and real-time total phosphorus concentration TP t The real-time monitoring value is used to compare with the target value to determine the adjustment direction of the adjustable zone. Real-time monitoring of key indicators of effluent water quality can provide dynamic feedback, thereby automatically adjusting aeration, stirring and 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 through online sensors and analytical instruments.

[0050] S300, according to N out , NO, TP, N out,t 、NO t and TP t Control the adjustable area to be in an open or closed state, and control the dosing device.

[0051] The intelligent control method for the adjustable zone of the AOA process for sewage treatment in this embodiment ensures that a stable treatment effect can be maintained under changing working conditions by real-time monitoring and adjusting the working states of the aeration, stirring and dosing devices according to the water quality conditions; automatically adjusts the state of the adjustable zone and the dosing device to avoid unnecessary energy consumption and waste of chemicals, and improves the economy of the sewage treatment system; by using this intelligent control method, the reliance on manual experience is reduced, the control accuracy is improved, and the difficulty of operation is reduced.

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

[0053] S310, determine N out With N out,t The size of N 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 a closed state.

[0054] If N out,t >N out:It means that the ammonia nitrogen concentration in the sewage is too high and the treatment effect is insufficient. Therefore, the adjustable zone is controlled to be in the open state, the aeration volume is increased and the stirring frequency is reduced to provide an oxygen-sufficient environment to promote nitrification reaction. Through the action of nitrifying bacteria, the ammonia nitrogen in the sewage is converted into nitrate, thereby accelerating the removal of ammonia nitrogen. out ≥N out,t :Indicates that the ammonia nitrogen concentration has reached the target value or is lower than the target value. At this time, the adjustable zone is controlled to be in a closed state, aeration is stopped, and the stirring frequency is increased to provide an anoxic environment to facilitate the removal of nitrates, the product of nitrification. According to the fluctuation of real-time ammonia nitrogen concentration, the intensity of aeration and stirring is dynamically adjusted to avoid excessive ammonia nitrogen, while saving energy consumption and ensuring stable and efficient treatment effects.

[0055] S320, judge NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , the dosing device is controlled to stop adding the carbon source to the adjustable area.

[0056] If NO t >NO, indicating that the nitrate concentration is too high and the denitrification capacity is insufficient. It is necessary to add carbon source to promote the denitrification reaction. Control the dosing device to add carbon source to the adjustable area. If NO≥NO t , indicating that the nitrate concentration is low and the carbon source supply is sufficient or excessive, stop adding the carbon source at this time. Adjust the carbon source dosage according to the real-time nitrate concentration to ensure the smooth progress of the denitrification reaction, effectively reduce the nitrate concentration, avoid waste caused by excessive carbon source addition, and optimize the operating cost. The carbon source 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 >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

[0058] If TP t >TP, indicating that the total phosphorus concentration exceeds the standard, it is necessary to add phosphorus removal agent for chemical phosphorus removal, and control the dosing device to add phosphorus removal agent to the adjustable area. t, indicating that the total phosphorus concentration is low, stop adding the dephosphorization agent to avoid excessive chemical agents. By real-time monitoring of the total phosphorus concentration and dynamically adjusting the addition of the dephosphorization agent, the phosphorus concentration is ensured to be within a reasonable range, the use of chemical agents is reduced, resource waste is avoided, and environmental pollution is reduced. The dephosphorization agent can be an iron salt (such as ferrous sulfate, ferric chloride), an aluminum salt (such as aluminum sulfate, aluminum chloride), a calcium salt (such as lime Ca(OH)2), and other chemical substances used to remove phosphorus content in sewage.

[0059] It is a preferred embodiment that step S320 is performed after step 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, in order to comply with environmental emission standards, avoid eutrophication, and save energy and reduce consumption, N out It is 1.0mg / L to 2.0mg / L, NO is 6.0mg / L, and TP is 0.5mg / L.

[0061] In one embodiment, after step S300, the following steps are also included: S400, repeating S200 and S300 once every time interval t. By setting the time interval t, it is possible to continuously monitor various parameters of sewage treatment, avoid data lag, ensure that the sewage treatment process is always in a controlled state, dynamically adjust the aeration, stirring and dosing devices to maximize the treatment efficiency, flexibly respond to different water quality changes, achieve efficient pollutant removal effects, and ensure that the effluent always stably meets the emission standards. At the same time, by setting the time interval t for repeated adjustments, excessive continuous aeration, stirring and other operations are avoided, and unnecessary energy consumption is reduced. In addition, automatic adjustment at fixed intervals t can greatly reduce manual intervention and reduce labor costs, while improving the level of intelligence and automation of processing.

[0062] In one embodiment, 2h≤t≤12h. When the sewage quality fluctuates greatly or the treatment load is high, selecting a shorter interval time (e.g., 2h) can quickly respond and adjust the equipment operation; while when the water quality is stable, selecting a longer interval time (e.g., 12h) can reduce the frequent start and stop of the equipment and extend the service life of the equipment. By setting the time interval 2h≤t≤12h, it is easy to achieve efficient, energy-saving and stable sewage treatment effects.

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

[0064] S100 also includes: obtaining three indicators that meet the influent requirements, namely, target organic matter concentration C, 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 sewage entering the adjustable zone, which is used to characterize the amount of organic pollutant load. in Refers to the target ammonia nitrogen concentration in sewage, reflecting the level of nitrogen pollutants. Target temperature T refers to the target temperature adapted to the treatment process, which is used to ensure the normal progress of biological reactions.

[0066] S200 also includes: obtaining the real-time organic matter concentration C at the water inlet end t , Real-time ammonia nitrogen concentration in,t and real-time temperature T t . Real-time organic matter concentration C t , Real-time ammonia nitrogen concentration in, The real-time temperature T is obtained by monitoring the real-time monitoring device and the real-time temperature T is obtained by monitoring the temperature sensor.

[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. Determine the difference between these indicators to ensure that the aeration, stirring and dosing devices in the treatment process can be adjusted according to the real-time water inflow and outflow of the adjustable zone.

[0068] The intelligent control method in this embodiment can achieve more accurate regulation of the sewage treatment process by simultaneously acquiring multiple key indicators at the water inlet and outlet ends. The sewage treatment process can adjust the operating parameters more intelligently and finely to ensure stable sewage treatment effects, energy conservation 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 The size of N in and N in,t The size of T and T t The size of N out,t >N out , C t >C、N in,t >N in or T t <T, the adjustable area is controlled to be in the open state; if N out,t ≤N out , Ct ≤C、N in,t ≤N in And T t ≥T, 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, it means that the ammonia nitrogen concentration in the effluent is high, the organic pollutant concentration in the influent is high, the ammonia nitrogen concentration in the influent is high, or the temperature is low. At this time, the adjustable zone is controlled to be in the open state. By starting the aeration device to supply air and reducing the stirring frequency of the stirring device, the ammonia nitrogen concentration and organic pollutant concentration in the adjustable zone are reduced, the temperature is increased, and the sewage treatment effect is improved.

[0072] If N out,t ≤N out , C t ≤C、N in,t ≤N in And T t ≥T, it means that the ammonia nitrogen concentration in the outlet water is lower than / equal to the target ammonia nitrogen concentration 1, the organic pollutant concentration in the inlet water is lower than / equal to the target organic pollutant concentration, the ammonia nitrogen concentration in the inlet water is lower than / equal to the target ammonia nitrogen concentration 2, and the temperature is higher than / equal to the target temperature. The water quality index meets the expectations. At this time, the control adjustable zone is in a closed state, which effectively avoids over-treatment, saves energy and extends the life of the equipment, while keeping the water quality within a stable and controllable range.

[0073] S320, judge NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , the dosing device is controlled to stop adding the carbon source to the adjustable area.

[0074] S330, determine TP and TP t The size of TP t >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

[0075] Steps S320 and S330 are the same as those in the above-mentioned embodiment.

[0076] In one embodiment, N out , C, N in , and T are all 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 is gradually reduced from the first air volume, and the stirring frequency of the stirring device is gradually increased 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 The size of N in and N in,t The size of T and T t The size of N out,t >N out , C t >C、N in,t >N in or T t <T, the control adjustable area is in the open state; if N out,t <N out , C t <C、N in,t <N in And T t >T, the control adjustable area is in the closed state; if N out,t ∈N out , C t ∈C, N in,t ∈N in And T t ∈T, the control adjustable area is in the middle state.

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

[0081] S320, judge NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , the dosing device is controlled to stop adding the carbon source to the adjustable area.

[0082] S330, determine TP and TP t The size of TP t >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

[0083] Steps S320 and S330 are the same as those in the above-mentioned embodiment.

[0084] In one embodiment, the air volume of the aeration device is gradually reduced from the first air volume, and the stirring frequency of the stirring device is gradually increased from the first stirring frequency to the second stirring frequency, specifically including:

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

[0086] Input the real-time dissolved oxygen concentration into the ASM2D model, and the ASM2D model generates a step-by-step change plan for the aeration air volume of the aeration device and the stirring frequency of the agitator. The ASM2D model is a mathematical model based on the activated sludge process that can simulate the interaction between different parameters in sewage treatment. The model generates an adjustment plan for the air volume of the aeration device and a frequency adjustment plan for the agitator based on the input dissolved oxygen concentration, so that the system can balance oxygen supply and stirring demand.

[0087] The air volume of the aeration device is gradually reduced from the first air volume based on the step change scheme, and the stirring frequency of the stirring device is gradually increased from the first stirring frequency to the second stirring frequency based on the step change scheme. The air volume of the aeration device is gradually reduced from the initial first air volume based on the step change scheme generated by the ASM2D model. The step reduction method of the air volume can be linear or nonlinear, depending on the processing requirements of the model feedback. The frequency of the stirring device is gradually increased from the initial first stirring frequency until the second stirring frequency is reached. The purpose of increasing the stirring frequency is to remove gas when reducing aeration, while ensuring sufficient mixing of sludge and water flow to avoid sludge sedimentation.

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

[0089] In one embodiment, C is 100 mg / L to 500 mg / L, N in The pH value is 15mg / L to 65mg / L, and T is 12℃ to 30℃. By controlling the state of the adjustable zone based on these three indicators at the water inlet end, it is possible to optimize microbial activity, improve sewage treatment efficiency, and save resources and costs.

[0090] In the description of this specification, if the terms "embodiment one", "this embodiment", "in an embodiment" and the like appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the invention or at least one embodiment or example of the invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example; moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in an appropriate manner.

[0091] In the description of this specification, the terms "connect", "install", "fix", "set", "have", etc. are all understood in a broad sense. 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0092] In the description of this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0093] The above description of the embodiments is to facilitate ordinary technicians in the technical field to understand and apply the technology of this case. People familiar with the technology in this field can obviously easily make various modifications to these examples and apply the general principles described here to other embodiments without creative work. Therefore, this case is not limited to the above embodiments. Modifications to the following situations should all be within the scope of protection of this case: ① A new technical solution implemented based on the technical solution of the present invention and combined with existing common knowledge, the technical effect produced by the new technical solution does not exceed the technical effect of the present invention; ② The equivalent replacement of some features of the technical solution of the present invention by using known technology, the technical effect produced is the same as the technical effect of the present invention; ③ The technical solution of the present invention can be expanded, and the substantive content of the expanded technical solution does not exceed the technical solution of the present invention; ④ The equivalent transformation made by using the contents of the description and drawings of the present invention is directly or indirectly applied to other related technical fields.

Claims

1. A sewage treatment AOA process adjustable zone intelligent control method, characterized in that: The adjustable zone has a water outlet and is provided 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; The adjustable zone intelligent control method comprises the following steps: S100, obtain three indicators that meet the effluent requirements, namely target ammonia nitrogen concentration - N out , target nitrate concentration NO and target total phosphorus concentration TP; S200, obtaining the real-time ammonia nitrogen concentration N at the water outlet out,t , real-time nitrate concentration NO t and real-time total phosphorus concentration TP t ; S300, according to the N out , NO, TP, N out,t 、NO t and TP t The adjustable area is controlled to be in an open state or a closed state, and the drug adding device is controlled.

2. The control method according to claim 1, characterized in that: The S300 specifically includes the following steps: Judge N out With N out,t The size of N 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 a closed state; Judging NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , then controlling the dosing device to stop adding the carbon source to the adjustable area; Determine TP and TP t The size of TP t >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

3. The control method according to claim 2, characterized in that: N out It is 1.0mg / L to 2.0mg / L, NO is 6.0mg / L, and TP is 0.5mg / L.

4. The control method according to claim 2, characterized in that: After S300, the following steps are also included: S400, repeatedly executing S200 and S300 at every interval t.

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

6. The control method according to any one of claims 2 to 5, characterized in that: The adjustable area also has a water inlet end; The step S100 also includes: obtaining three indicators that meet the water inlet requirements, namely, target organic matter concentration C, target ammonia nitrogen concentration N in and target temperature T; The step S200 also includes: obtaining the real-time organic matter concentration C at the water inlet. t , Real-time ammonia nitrogen concentration in,t and real-time temperature T t ; 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 The adjustable area is controlled to be in an open state or a closed state, and the drug adding device is controlled.

7. The control method according to claim 6, characterized in that: The S300 specifically includes: At the same time, judge N out and N out,t Size, C and C t The size of N in and N in,t The size of T and T t The size of N out,t >N out , C t >C、N in,t >N in or T t <T, the adjustable area is controlled to be in the open state; if N out,t ≤N out , C t ≤C、N in,t ≤N in And T t ≥T, the adjustable area is controlled to be in a closed state; Judging NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , then controlling the dosing device to stop adding the carbon source to the adjustable area; Determine TP and TP t The size of TP t >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

8. The control method according to claim 7, characterized in that: The N out , C, N in , and T are all interval values; The adjustable zone also has an intermediate state. When the adjustable zone is in the intermediate state, the air volume of the aeration device is gradually reduced from the first air volume, and the stirring frequency of the stirring device is gradually increased from the first stirring frequency to the second stirring frequency. The S300 specifically includes: At the same time, judge N out and N out,t Size, C and C t The size of N in and N in,t The size of T and T t The size of N out,t >N out , C t >C、N in,t >N in or T t <T, the adjustable area is controlled to be in the open state; if N out,t <N out , C t <C、N in,t <N in And T t >T, the adjustable area is controlled to be in a closed state; if N out,t ∈N out , C t ∈C, N in,t ∈N in And T t ∈T, the adjustable area is controlled to be in an intermediate state; Judging NO and NO t The size of t >NO, the dosing device is controlled to add carbon source to the adjustable area; if NO≥NO t , then controlling the dosing device to stop adding the carbon source to the adjustable area; Determine TP and TP t The size of TP t >TP, the dosing device is controlled to add dephosphorization agent to the adjustable area; if TP ≥ TP t , the dosing device is controlled to stop adding the dephosphorization agent to the adjustable area.

9. The control method according to claim 8, characterized in that: The air volume of the aeration device is gradually reduced from the first air volume, and the stirring frequency of the stirring device is gradually increased from the first stirring frequency to the second stirring frequency, specifically including: Obtaining the real-time dissolved oxygen concentration of the adjustable zone; Input the real-time dissolved oxygen concentration into the ASM2D model, and the ASM2D model generates a step-by-step change plan of the aeration air volume of the aeration device and the stirring frequency of the stirring device; The air volume of the aeration device is step-wise reduced from the first air volume based on the step-by-step variation scheme, and the stirring frequency of the stirring device is step-wise increased from the first stirring frequency to a second stirring frequency based on the step-by-step variation scheme.

10. The control method according to any one of claims 7 to 9, characterized in that: C is 100mg / L to 500mg / L, N in The pH value is 15mg / L to 65mg / L, and T is 12℃ to 30℃.

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