CN115259413B - Air quantity control method for accurate aeration system - Google Patents
Air quantity control method for accurate aeration system Download PDFInfo
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- CN115259413B CN115259413B CN202210874455.0A CN202210874455A CN115259413B CN 115259413 B CN115259413 B CN 115259413B CN 202210874455 A CN202210874455 A CN 202210874455A CN 115259413 B CN115259413 B CN 115259413B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention relates to the technical field of sewage treatment, and particularly discloses an air volume control method for a precise aeration system, wherein the precise aeration system comprises a data collector, a data calculation and analysis unit and a signal feedback unit; after a worker inputs the control range of dissolved oxygen into the precise aeration system and the data acquisition device acquires the required instrument data, the data calculation and analysis unit is utilized to calculate the aeration quantity according to the data acquired by the data acquisition device, the input air quantity of the air blower is judged according to whether the real-time dissolved oxygen value of the aerobic tank is in the control range of dissolved oxygen or not, and the input air quantity of the air blower is fed back to the air blower through the signal feedback unit, so that the aeration quantity is precisely controlled. By the method, the aeration system can be accurately controlled, the fan supplies air as required, the operation efficiency is improved, and the aim of saving energy is fulfilled.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an air quantity control method for a precise aeration system.
Background
At present, in a sewage treatment plant, an aeration unit is one of core technical units of a sewage treatment activated sludge method and a deformation process thereof, and is also a main energy consumption unit in a sewage biological treatment process, so that the aeration unit is one of important focusing units for energy conservation and consumption reduction of the sewage treatment plant, the accurate aeration technology is used for controlling an aeration system, so that the dissolved oxygen of the biological treatment process can be controlled within a certain range, the stable operation of the sewage treatment system is ensured, the energy conservation and consumption reduction can be realized, and the biological model feedforward or the feedback and the hardware integration control mode are mostly adopted in the sewage treatment plant using the accurate aeration technology at present, wherein the biological model feedforward is also based on an international water cooperation ASM series model.
However, when the ASM series model is adopted for feedforward control, the model is complex, the parameters are more, the on-site implementation is more difficult, when the mode of feedforward-hardware integrated control is adopted, the running condition of the intermediate process is easy to ignore because the air quantity is controlled only through dissolved oxygen, once the water quality of the inflow water and the fluctuation of the water quantity are larger, the stable process operation and the water quality of the outflow water are difficult to ensure, and the feedforward+DO feedforward auxiliary air quantity control method is developed, so that the effect of on-demand aeration can be achieved, and the implementation is easier in the engineering application process.
Disclosure of Invention
The invention aims to provide an air quantity control method for a precise aeration system, which aims to provide a strong-operability regulation and control method for actual operation projects and improve the operation efficiency of a fan.
In order to achieve the above purpose, the air volume control method for the precise aeration system adopted by the invention comprises the following steps:
the accurate aeration system comprises a data collector, a data calculation and analysis unit and a signal feedback unit;
the data acquisition device is used for acquiring data of an activated sludge oxygen consumption rate online determinator, an oxygen transfer efficiency online determinator, a dissolved oxygen determinator, a sludge concentration determinator, a water inlet flowmeter, a water inlet COD online determinator, a water outlet COD online determinator, a biochemical tank liquid level meter, a biochemical tank thermometer and a thermal air flowmeter;
inputting a control range of dissolved oxygen into the accurate aeration system by a worker;
calculating aeration quantity by utilizing the data acquired by the data acquisition unit by the data calculation and analysis unit;
the data calculation and analysis unit judges the input air quantity of the air blower according to whether the real-time dissolved oxygen value of the aerobic tank is within the dissolved oxygen control range, and feeds the input air quantity of the air blower back to the air blower through the signal feedback unit so as to accurately control the aeration quantity.
Wherein, the control range DO of the dissolved oxygen of the aerobic tank needs to be set in the precise aeration system L ～DO H 。
The calculation formula of the oxygen demand of the aerobic tank is as follows: S=OUR×V-b×θ, where S is oxygen demand of the aerobic tank, kg/h; OUR is the oxygen consumption rate of the activated sludge, g/(L.h); v is the volume of the aerobic tank, m 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is a sensitivity factor, kg/h; b is a sensitivity factor correction coefficient, and the value is 1.5-1.7.
The calculation formula of the sensitivity factor theta is as follows:in (1) the->Is the oxygen demand of the residual sludge, kg/h, & lt->For the current time +.>Instantaneous value of->For t hours before the current moment +.>The value of t is in the range of 12 to 24 hours.
Oxygen demand of the excess sludgeThe calculation formula of (2) is as follows: /> In which Q Inflow of water M is the water inflow 3 /h；COD i The water is COD, g/L; COD (chemical oxygen demand) e The water is COD, g/L; t is the water temperature of the biochemical pool, and the temperature is DEG C.
The calculation formula for converting the oxygen demand of the aerobic tank into the aeration quantity is as follows: in which Q Air-conditioner M is the aeration quantity needed 3 /h; s is oxygen demand of an aerobic tank, and kg/h; c (C) S(20) Is the saturated dissolved oxygen concentration in the standard condition, mg/L; alpha is the ratio of the oxygen transmission rate of sewage to clear water, and 0.83 is taken; beta is the ratio of sewage to saturated DO in clear water, and 0.95 is taken; ρ is a pressure correction coefficient, 1.009; t is water temperature, DEG C; c (C) S(T) When the water temperature T is the average DO saturation in the aerobic tank, mg/L; c is the correction value of DO in the aerobic tank, mg/L; e (E) A The oxygen utilization rate,%, is given by the oxygen transfer efficiency on-line analyzer, and if this condition is not present, E A The empirical value is 25-35%.
The revising method of C in the calculation formula of the aeration quantity is as follows: if DO of the previous period is within the control range DO L ～DO H C takes DO value of the dissolved oxygen meter in the previous period, otherwise C is corrected to be the average value of DO control range according to need, namely
The method for judging the input air quantity of the blower by the data calculation and analysis unit comprises the following steps: when the actual dissolved oxygen is maintained in the control rangeEnclosure (DO) L ～DO H ) When the input air volume of the blower at this time is maintained at the previous time, and when the actual dissolved oxygen is not within the control range (DO L ～DO H ) And when the simulated aeration quantity calculated by the data calculation and analysis unit is the input air quantity of the blower.
The invention has the beneficial effects that: the control range of the dissolved oxygen is input into the precise aeration system, the data acquired by the data acquisition device is subjected to aeration calculation through the data calculation and analysis unit, then the data calculation and analysis unit judges the input air volume of the air blower, the signal feedback unit transmits the input air volume signal to the air blower, and meanwhile, the precise aeration system compares the data of the flowmeter with the input air volume of the air blower, so that the output air volume of the air blower is corrected. When the actual dissolved oxygen is maintained within the control range (DO L ～DO H ) When the input air volume of the blower at this time is maintained at the previous time, and when the actual dissolved oxygen is not within the control range (DO L ～DO H ) When the method is used, the simulated aeration quantity calculated by the data calculation and analysis unit is the input air quantity of the air blower, the aeration system can be accurately controlled, the air blower supplies air according to needs, the operation efficiency is improved, the purpose of energy saving is achieved, and meanwhile, the method is easy and convenient to operate and easy to realize in the engineering application process.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a specific flowchart of an air volume control method for a precise aeration system according to the present invention.
FIG. 2 is a graph showing actual aeration rate and dissolved oxygen control change in a first embodiment of an air volume control method for a precision aeration system according to the present invention.
Fig. 3 is a flow chart of the steps of a method for controlling the air volume of a precision aeration system according to the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Referring to fig. 1 to 3, the present invention provides an air volume control method for a precise aeration system, comprising the following steps:
s1: the accurate aeration system comprises a data collector, a data calculation and analysis unit and a signal feedback unit;
s2: the data acquisition device is used for acquiring data of an activated sludge oxygen consumption rate online determinator, an oxygen transfer efficiency online determinator, a dissolved oxygen determinator, a sludge concentration determinator, a water inlet flowmeter, a water inlet COD online determinator, a water outlet COD online determinator, a biochemical tank liquid level meter, a biochemical tank thermometer and a thermal air flowmeter;
s3: inputting a control range of dissolved oxygen into the accurate aeration system by a worker;
s4: calculating aeration quantity by utilizing the data acquired by the data acquisition unit by the data calculation and analysis unit;
s5: the data calculation and analysis unit judges the input air quantity of the air blower according to whether the real-time dissolved oxygen value of the aerobic tank is within the dissolved oxygen control range, and feeds the input air quantity of the air blower back to the air blower through the signal feedback unit so as to accurately control the aeration quantity.
Further, a control range DO of dissolved oxygen of the aerobic tank needs to be set in the precise aeration system L ～DO H 。
Further, the calculation formula of the oxygen demand of the aerobic tank is as follows: S=OUR×V-b×θ, where S is oxygen demand of the aerobic tank, kg/h;OUR is the oxygen consumption rate of the activated sludge, g/(L.h); v is the volume of the aerobic tank, m 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is a sensitivity factor, kg/h; b is a sensitivity factor correction coefficient, and the value is 1.5-1.7.
Further, the calculation formula of the sensitivity factor θ is:in (1) the->Is the oxygen demand of the residual sludge, kg/h, & lt->For the current time +.>Instantaneous value of->For t hours before the current moment +.>The value of t is in the range of 12 to 24 hours.
Further, the oxygen demand of the excess sludgeThe calculation formula of (2) is as follows: /> Wherein, the water inlet Q is the water inlet amount, m 3 /h；COD i The water is COD, g/L; COD (chemical oxygen demand) e The water is COD, g/L; t is the water temperature of the biochemical pool, and the temperature is DEG C.
Further, the calculation formula for converting the oxygen demand of the aerobic tank into the aeration quantity is as follows: in which Q Air-conditioner M is the aeration quantity needed 3 /h; s is oxygen demand of an aerobic tank, and kg/h; c (C) S(20) Is the saturated dissolved oxygen concentration in the standard condition, mg/L; alpha is the ratio of the oxygen transmission rate of sewage to clear water, and 0.83 is taken; beta is the ratio of sewage to saturated DO in clear water, and 0.95 is taken; ρ is a pressure correction coefficient, 1.009; t is water temperature, DEG C; c (C) S(T) When the water temperature T is the average DO saturation in the aerobic tank, mg/L; c is the correction value of DO in the aerobic tank, mg/L; e (E) A The oxygen utilization rate,%, is given by the oxygen transfer efficiency on-line analyzer, and if this condition is not present, E A The empirical value is 25-35%.
Further, the revising method of C in the calculation formula of the aeration quantity is as follows: if DO of the previous period is within the control range DO L ～DO H C takes DO value of the dissolved oxygen meter in the previous period, otherwise C is corrected to be the average value of DO control range according to need, namely
Further, the method for judging the input air quantity of the blower by the data calculation and analysis unit is as follows: when the actual dissolved oxygen is maintained within the control range (DO L ～DO H ) When the input air volume of the blower at this time is maintained at the previous time, and when the actual dissolved oxygen is not within the control range (DO L ～DO H ) And when the simulated aeration quantity calculated by the data calculation and analysis unit is the input air quantity of the blower.
In a first embodiment of the present invention:
the daily treatment water quantity of a certain domestic sewage plant is 1.0-1.5 ten thousand tons, an A2O process is adopted, a group of biochemical tanks are adopted, the fluctuation range of COD of inflow water is 100-500mg/L, the fluctuation range of ammonia nitrogen of inflow water is 5-48mg/L, and the fluctuation range of total nitrogen of inflow water is 18-65mg/L.
The active sludge oxygen consumption rate online determinator, the oxygen transfer efficiency online determinator, the dissolved oxygen determinator, the sludge concentration determinator, the water inlet flowmeter, the water inlet COD online determinator, the water inlet ammonia nitrogen online determinator, the water inlet TN online determinator, the water outlet COD online determinator, the water outlet ammonia nitrogen online determinator, the water outlet TN online determinator, the biochemical tank liquid level meter, the biochemical tank thermometer, the flowmeter and the blower data signals are all connected to the data acquisition device.
The DO control range of the plant is typically chosen to be in the interval 1.0-2.0 mg/L.
The control method in the specification is written into the precise aeration system, after the system starts to operate, the meters transmit real-time data signals to the data collector, the data calculation and analysis unit calculates aeration through algorithm integration, the data calculation and analysis unit judges the calculated aeration, determines the input air quantity of the air blower, and gives the input air quantity signals to the air blower through the signal feedback unit, and meanwhile, the signal feedback unit compares the data of the flowmeter with the input air quantity of the air blower to correct the output air quantity of the air blower.
FIG. 2 shows the actual aeration rate and the change of the dissolved oxygen control in the present embodiment, which are continuously operated for 1000 hours after aeration control is performed in a certain sewage plant.
After aeration control is carried out, the average value of the air-water ratio of the sewage plant is 3.3, the stability of the actual dissolved oxygen in the control range reaches 80%, and the outlet water stably reaches the first grade A standard in GB18918-2002, so that the purposes of stabilizing the dissolved oxygen of an aerobic tank, saving energy and reducing consumption are achieved.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (1)
1. The air quantity control method for the precise aeration system is characterized by comprising the following steps of:
the accurate aeration system comprises a data collector, a data calculation and analysis unit and a signal feedback unit;
the data acquisition device is used for acquiring data of an activated sludge oxygen consumption rate online determinator, an oxygen transfer efficiency online determinator, a dissolved oxygen determinator, a sludge concentration determinator, a water inlet flowmeter, a water inlet COD online determinator, a water outlet COD online determinator, a biochemical tank liquid level meter, a biochemical tank thermometer and a thermal air flowmeter;
inputting a control range of dissolved oxygen into the accurate aeration system by a worker;
calculating aeration quantity by utilizing the data acquired by the data acquisition unit by the data calculation and analysis unit;
the data calculation and analysis unit judges the input air quantity of the air blower according to whether the real-time dissolved oxygen value of the aerobic tank is within the dissolved oxygen control range, and feeds back the input air quantity of the air blower to the air blower through the signal feedback unit so as to accurately control the aeration quantity;
the control range DO of the dissolved oxygen of the aerobic tank needs to be set in the precise aeration system L ~DO H ；
The calculation formula of the oxygen demand of the aerobic tank is as follows:wherein S is oxygen demand of an aerobic tank, and kg/h; OUR is the oxygen consumption rate of the activated sludge, g/(L ∙ h); v is the volume of the aerobic tank, m 3 The method comprises the steps of carrying out a first treatment on the surface of the θ is a sensitivity factor, kg/h; b is a sensitivity factor correction coefficient, and the value is 1.5-1.7;
the calculation formula of the sensitivity factor theta is as follows:wherein phi is the oxygen demand of the excess sludge, kg/h 0 Is the instantaneous value phi of the current moment phi t The value range of t is 12-24 hours, which is the average value of phi in t hours before the current moment;
the calculation formula of the oxygen demand phi of the excess sludge is as follows:in which Q Inflow of water M is the water inflow 3 /h；COD i The water is COD, g/L; COD (chemical oxygen demand) e The water is COD, g/L; t is the water temperature of the biochemical pool, and the temperature is lower than the DEG C;
the calculation formula for converting the oxygen demand of the aerobic tank into the aeration quantity is as follows:in which Q Air-conditioner M is the aeration quantity needed 3 /h; s is oxygen demand of an aerobic tank, and kg/h; />Is the saturated dissolved oxygen concentration in the standard condition, mg/L; alpha is the ratio of the oxygen transmission rate of sewage to clear water, and 0.83 is taken; beta is the ratio of sewage to saturated DO in clear water, and 0.95 is taken; ρ is a pressure correction coefficient, 1.009; t is water temperature, DEG C; />When the water temperature T is the average DO saturation in the aerobic tank, mg/L; c is the correction value of DO in the aerobic tank, mg/L; e (E) A The oxygen utilization rate,%, is given by the oxygen transfer efficiency online meter, if there is no oxygen transfer efficiency online meter, E A Taking an empirical value of 25% -35%;
the revising method of C in the calculation formula of the aeration quantity is as follows: if DO of the previous period is within the control range DO L ~DO H C takes DO value of the dissolved oxygen meter in the previous period, otherwise C is corrected to be the average value of DO control range according to need, namely；
The method for judging the input air quantity of the blower by the data calculation and analysis unit comprises the following steps: when the actual dissolved oxygen is maintained within the control range (DO L ~DO H ) When the input air volume of the blower at this time is maintained at the previous time, and when the actual dissolved oxygen is not within the control range (DO L ~DO H ) When the data calculation and analysis unit calculatesThe simulated aeration amount is the input air amount of the blower.
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