CN116239233A - Accurate aeration air volume calculation system and air volume control method thereof - Google Patents
Accurate aeration air volume calculation system and air volume control method thereof Download PDFInfo
- Publication number
- CN116239233A CN116239233A CN202211476681.XA CN202211476681A CN116239233A CN 116239233 A CN116239233 A CN 116239233A CN 202211476681 A CN202211476681 A CN 202211476681A CN 116239233 A CN116239233 A CN 116239233A
- Authority
- CN
- China
- Prior art keywords
- calculation
- water
- comprehensive
- air volume
- oxygen
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004364 calculation method Methods 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 54
- 238000005273 aeration Methods 0.000 title claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 115
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 90
- 229910052760 oxygen Inorganic materials 0.000 claims description 90
- 239000001301 oxygen Substances 0.000 claims description 90
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 62
- 229910052757 nitrogen Inorganic materials 0.000 claims description 31
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 24
- 239000010802 sludge Substances 0.000 claims description 23
- 238000007405 data analysis Methods 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 230000036284 oxygen consumption Effects 0.000 claims description 8
- 230000035945 sensitivity Effects 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000010865 sewage Substances 0.000 abstract description 15
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- 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
- C02F3/006—Regulation methods for biological treatment
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/04—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
- G05B13/042—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators in which a parameter or coefficient is automatically adjusted to optimise the performance
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Molecular Biology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Hydrology & Water Resources (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Food Science & Technology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Medical Informatics (AREA)
- Software Systems (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Evolutionary Computation (AREA)
- Artificial Intelligence (AREA)
- Emergency Medicine (AREA)
- Biomedical Technology (AREA)
- Microbiology (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention relates to the technical field of sewage treatment, and particularly discloses a precise aeration air quantity calculation system and an air quantity control method thereof.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a precise aeration air volume calculation system and an air volume control method thereof.
Background
At present, the cooperative synergism of pollution reduction and carbon reduction is taken as a new period of an important strategic direction, and the water treatment industry with high carbon emission naturally blames and does not have side credits. According to statistics, in the urban sewage treatment plants established in China at present, the electricity charge and the dosing charge account for more than 50% of the sewage treatment cost, so that the sewage treatment plants need to implement optimized operation on the premise of up-to-standard emission so as to achieve the aim of energy conservation and consumption reduction, and the accurate aeration is one of important measures for energy conservation and consumption reduction of the sewage plants.
The accurate aeration is a control technology taking on-demand aeration as a guiding target, and aims to provide needed oxygen for the pollutant aerobic reaction and reduce the power consumption of an aeration system. At present, the control technology capable of taking on-demand aeration as a guiding target is control logic based on feedforward and feedback, but the related patent of the current accurate aeration does not mention the detailed application of feedforward and feedback control and the control method in engineering application. Because of the real-time variability of the water inflow of the sewage plant in engineering application, the aeration of the sewage plant needs to be comprehensively controlled so as to realize the true accurate aeration.
Disclosure of Invention
The invention aims to provide a precise aeration air volume calculation system and an air volume control method thereof, and aims to provide a detailed control method and application strategy for precise aeration engineering application.
In order to achieve the aim, the accurate aeration air volume calculation system comprises a data acquisition unit, a data analysis unit and a fan control unit, wherein the data acquisition unit is used for acquiring data of an activated sludge oxygen consumption rate online tester, an oxygen transfer efficiency online tester, a dissolved oxygen tester, a sludge concentration tester, a water inlet flowmeter, a water inlet COD online tester, a water outlet COD online tester, a biochemical pool liquid level meter, a water inlet ammonia nitrogen online tester, a water outlet ammonia nitrogen online tester, a water inlet total nitrogen (Kjeldahl) online tester, a water outlet total nitrogen (Kjeldahl) online tester, a biochemical pool thermometer and a thermal air flowmeter; the data analysis unit comprises a feedforward calculation subsystem and a feedback auxiliary calculation subsystem, and comprehensive air quantity is obtained according to comprehensive calculation of feedforward and feedback; the fan control unit feeds the comprehensive air quantity back to the fan so as to dynamically control the air quantity.
The invention also provides an air quantity control application method of the precise aeration air quantity calculation system, which can realize the comprehensive control of the feedforward and the feedforward of the aeration system, wherein the key of the calculation of the feedforward calculation subsystem is that a correction coefficient a value and a trend quantity N caused by nitrogen are provided, and the calculation and the use methods thereof are provided; the key of the application of the 'feedback' auxiliary computing subsystem is that the stability of the biochemical environment is divided according to the fluctuation range of real-time DO, and the comprehensive oxygen demand is determined according to the value of the correction coefficient a, and the method specifically comprises the following steps:
the accurate aeration air volume calculation system comprises a data acquisition unit, a data analysis unit and a fan control unit;
the data analysis unit should contain the functionality of a "feed forward" computing subsystem and a "feed back" auxiliary computing subsystem.
The data acquisition unit 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 water inlet ammonia nitrogen online determinator, a water outlet ammonia nitrogen online determinator, a water inlet total nitrogen (Kjeldahl) online determinator, a water outlet total nitrogen (Kjeldahl) online determinator, a biochemical tank liquid level meter, a biochemical tank thermometer and a thermal air flowmeter;
the data analysis unit is supplied with a control range (DO L ，DO H )；
Collecting data of each instrument through the data collecting unit;
the feedforward calculation subsystem is used for calculating the oxygen demand of different scenes based on the data acquired by the data acquisition unit, wherein the oxygen demand of different scenes is calculated by utilizing the acquired water quality and water quantity of the water inlet and the operation process parameters according to different water quality changes and water quality load changes;
the feedback auxiliary calculation subsystem is used for obtaining the comprehensive oxygen demand based on the oxygen demand calculation result and combining application methods of different dissolved oxygen environments, the comprehensive oxygen demand is converted into the comprehensive air quantity, and the application methods of the different dissolved oxygen environments are used for comprehensively calculating the oxygen demand calculation results of different scenes according to the dissolved oxygen environments.
The fan control unit feeds the comprehensive air quantity back to the fan so as to dynamically control the air quantity.
The method for calculating the oxygen demand of different scenes by the feedforward calculation subsystem comprises the following steps:
the calculation formula of the oxygen demand is as follows: s=a× (our×v-b×θ+n), where S is aeration oxygen demand, kg/h; OUR is the oxygen consumption rate g/(L.h) of the activated sludge; v is the effective 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 generally takes a value of 1.5-1.7; n is the trend amount caused by nitrogen, kg/h; a is the phase with carbon and nitrogen of the inlet waterAnd (5) an off correction coefficient.
The calculation formula of the correction coefficient a is as follows:
wherein L is C gCOD/(gMLSS.d) or gCOD/(m) is the COD load at the present time 3 ·d)；L Ct gCOD/(gMLSS.d) or gCOD/(m) is the average value of COD load within t hours before the current moment 3 ·d)；L N gNH for the current ammonia nitrogen load 3 N/(gMLSS.d) or gNH 3 -N/(m 3 ·d)；L Nt Is the average value of ammonia nitrogen load in t hours before the current moment, gNH 3 N/(gMLSS.d) or gNH 3 -N/(m 3 D) a step of; x and Y are influence coefficients of inflow COD and ammonia nitrogen on aeration of the plant respectively, and can be adjusted according to site conditions, and the value ranges of X and Y are 0-1.
The calculation formula of the trend quantity N is as follows:
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.
Wherein the oxygen demand of the excess sludge
The 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.
Wherein, the oxygen demand calculation forms the following three calculation methods according to the changes of water quantity and water quality load: :
the calculation method 1 comprises the following steps:
when 0.999< a <1.001 and the water amount change is less than 5%, a=1 and n=0 in the oxygen demand calculation formula;
the calculation method 2 comprises the following steps:
when a is out of the range of (0.999,1.001), or the variation of the inflow water amount is more than 5%, if
The correction coefficient a is a coefficient caused by carbon and nitrogen changes in water quality, and the trend amount N of nitrogen does not need to be increased at the moment, so N=0;
the calculation method 3:
when a is out of the range of (0.999,1.001), or the variation of the inflow water amount is more than 5%, if
At this time, both the a value and the N value are calculated.
The air volume application method of the feedback auxiliary computing subsystem according to different dissolved oxygen environments comprises the following steps:
according to different dissolved oxygen environments, a comprehensive air quantity is obtained by using an air quantity application method
Application method 1: when dissolved oxygen in real time (DO L ，DO H ) Within the range;
at this time, the biochemical environment is relatively stable, and a calculation method 1 is adopted;
application method 2: when the real-time dissolved oxygen is less than DO L ；
When a is less than or equal to 1, adopting an A multiplied by the calculation method 3+B multiplied by the calculation method 2;
when a >1, the comprehensive calculation of "a×calculation method 3+B ×calculation method 1" is adopted;
application method 3: when the real-time dissolved oxygen is greater than DO H ；
When a is less than or equal to 1, adopting an A multiplied by the calculation method 1+B multiplied by the calculation method 2;
when a >1, the comprehensive calculation of "a×calculation method 1+B ×calculation method 2" is adopted;
wherein A and B represent the proportion of two calculation methods in the comprehensive mode respectively in calculation, and can be modified according to project implementation.
Preferably, 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 isThe ratio of the oxygen transmission rate of sewage to clear water is 0.83; 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 Is oxygen utilization rate,%.
According to the accurate aeration air volume computing system and the air volume control method thereof, the data of each instrument are collected through the data collecting unit, comprehensive computation is carried out through the feedforward computing subsystem and the feedback auxiliary computing subsystem of the data analyzing unit according to the oxygen demand computing method of different feedforward scenes and the application method of different dissolved oxygen environments of the feedback, and the fan control unit feeds back the comprehensive air volume to the fan so as to dynamically control the air volume. The method describes the calculation and application of 'feedforward' + 'feedback' in the accurate aeration control in detail, and is suitable for more application scenes, thereby achieving the purposes of stable operation of the biochemical section aeration and on-demand aeration under variable water inlet conditions and reducing the operation cost.
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 schematic structural diagram of a precise aeration air volume calculation system according to the present invention.
Fig. 2 is a flow chart of the steps of the air volume control method of the precise aeration air volume calculation system.
FIG. 3 is a graph showing the trend of data of actual aeration rate and dissolved oxygen control change in continuous operation for 600 hours after aeration control according to the first embodiment of the present invention.
Detailed Description
Referring to fig. 1 and 3, the invention provides a precise aeration air volume calculation system, which comprises a data acquisition unit, a data analysis unit and a fan control unit, wherein the data acquisition unit is used for acquiring data of an activated sludge oxygen consumption rate online analyzer, an oxygen transfer efficiency online analyzer, a dissolved oxygen analyzer, a sludge concentration analyzer, a water inlet flowmeter, a water inlet COD online analyzer, a water outlet COD online analyzer, a biochemical pool liquid level meter, a water inlet ammonia nitrogen online analyzer, a water outlet ammonia nitrogen online analyzer, a water inlet total nitrogen (Kjeldahl) online analyzer, a water outlet total nitrogen (Kjeldahl) online analyzer, a biochemical pool thermometer and a thermal air flowmeter; the data analysis unit comprises a feedforward calculation subsystem and a feedback auxiliary calculation subsystem, and comprehensive air quantity is obtained according to comprehensive calculation of feedforward and feedback; the fan control unit feeds the comprehensive air quantity back to the fan so as to dynamically control the air quantity.
Referring to fig. 2, the present invention further provides an air volume control method of a precise aeration air volume computing system, which includes the following steps:
s1: the data analysis unit inputs the demand control range (DO L ，DO H )；
S2: collecting data of each instrument through the data collecting unit;
s3: the feedforward calculation subsystem is used for calculating the oxygen demand of different scenes based on the data acquired by the data acquisition unit;
s4: the feedback auxiliary calculation subsystem is used for obtaining the comprehensive oxygen demand by combining application methods of different dissolved oxygen environments based on the oxygen demand calculation result and converting the comprehensive oxygen demand into comprehensive air quantity;
s5: the fan control unit feeds the comprehensive air quantity back to the fan so as to dynamically control the air quantity.
The method for the feedforward calculation subsystem to calculate the oxygen demand of different scenes comprises the following steps:
the calculation formula of the oxygen demand is as follows: s=a× (our×v-b×θ+n), where S is aeration oxygen demand, kg/h; OUR is the oxygen consumption rate g/(L.h) of the activated sludge; 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 Theta is the medicineSensitivity factor, kg/h; b is a sensitivity factor correction coefficient, and generally takes a value of 1.5-1.7; n is the trend amount caused by nitrogen, kg/h; a is a correction coefficient related to carbon and nitrogen of the inlet water, and when the mud age is less than 15 days, OUR can be corrected as follows: OUR (OUR) Correction ＝OUR×MLSS t /MLSS 0 。
The calculation formula of the correction coefficient a is as follows:
wherein L is C gCOD/(gMLSS.d) or gCOD/(m) is the COD load at the present time 3 ·d)；L Ct gCOD/(gMLSS.d) or gCOD/(m) is the average value of COD load within t hours before the current moment 3 ·d)；L N gNH for the current ammonia nitrogen load 3 N/(gMLSS.d) or gNH 3 -N/(m 3 ·d)；L Nt Is the average value of ammonia nitrogen load in t hours before the current moment, gNH 3 N/(gMLSS.d) or gNH 3 -N/(m 3 D) a step of; x and Y are influence coefficients of inflow COD and ammonia nitrogen on aeration of the plant respectively, and can be adjusted according to site conditions, and the value ranges of X and Y are 0-1.
The water quality load can be a sludge load or a volume load, but the load expression forms of COD and ammonia nitrogen are unified, namely, the calculation method of a totally uses the sludge load or totally uses the volume load.
The calculation formula of the trend quantity N is as follows:
The sensitivity factorThe calculation formula of θ is:
in (1) the->
Is the oxygen demand of the residual sludge, kg/h, & lt->
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 sludge
The 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 oxygen demand calculation forms the following three calculation methods according to the change of water quantity and water quality load:
the calculation method 1 comprises the following steps:
when 0.999< a <1.001 and the water amount change is less than 5%, a=1 and n=0 in the oxygen demand calculation formula;
the calculation method 2 comprises the following steps:
when a isIf the water inflow amount is out of the range of (0.999,1.001) or the variation of the water inflow amount is more than 5%
The correction coefficient a is a coefficient caused by carbon and nitrogen changes in water quality, and the trend amount N of nitrogen does not need to be increased at the moment, so N=0;
the calculation method 3:
when a is out of the range of (0.999,1.001), or the variation of the inflow water amount is more than 5%, if
At this time, both the a value and the N value are calculated.
The air volume application method of the feedback auxiliary computing subsystem according to different dissolved oxygen environments comprises the following steps:
according to different dissolved oxygen environments, an air volume application method is used to obtain comprehensive air volume;
application method 1: when dissolved oxygen in real time (DO L ，DO H ) Within the range;
at this time, the biochemical environment is relatively stable, and a calculation method 1 is adopted;
application method 2: when the real-time dissolved oxygen is less than DO L ；
When a is less than or equal to 1, adopting an A multiplied by the calculation method 3+B multiplied by the calculation method 2;
when a >1, the comprehensive calculation of "a×calculation method 3+B ×calculation method 1" is adopted;
application method 3: when the real-time dissolved oxygen is greater than DO H ；
When a is less than or equal to 1, adopting an A multiplied by the calculation method 1+B multiplied by the calculation method 2;
when a >1, the comprehensive calculation of "a×calculation method 1+B ×calculation method 2" is adopted;
wherein A and B represent the proportion of two calculation methods in the comprehensive mode respectively in calculation, and can be modified according to project implementation.
Preferably, 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 Is oxygen utilization rate,%.
First embodiment of the present invention:
the daily water treatment amount of a certain domestic sewage plant is 1.5-2.0 ten thousand tons, A is adopted 2 In the O process, the COD fluctuation range of the inflow water is 80-550mg/L, the ammonia nitrogen fluctuation range of the inflow water is 5-55mg/L, and the total nitrogen fluctuation range of the inflow water is 15-90mg/L, so that the factory is adjacent to a slaughterhouse, and the inflow water with high ammonia nitrogen and high total nitrogen is always available.
The sewage plant is provided with online monitoring and detecting equipment such as an activated sludge oxygen consumption rate online detector, an oxygen transfer efficiency online detector, a dissolved oxygen detector, a sludge concentration detector, a water inlet flowmeter, a water inlet COD online detector, a water inlet ammonia nitrogen online detector, a water inlet TN online detector, a water outlet COD online detector, a water outlet ammonia nitrogen online detector, a water outlet TN online detector, a biochemical tank liquid level meter, a biochemical tank thermometer and the like; the aeration pipeline is provided with a thermal air flowmeter and an air regulating valve.
And all the meters and the blowers are connected into the accurate aeration air quantity calculation system.
The plant is subjected to aeration control according to the control method described in the present invention.
The fluctuation of COD and ammonia nitrogen in the water inlet and total nitrogen in the water inlet of the plant is large, and the water inlet with high ammonia nitrogen and high total nitrogen is frequently carried out, so that the three application methods are required to be comprehensively controlled.
Because the sludge age of the plant is kept for a long time at 18-20 days, the sludge concentration change is small, a volumetric load algorithm is adopted when calculating the value a, and the value ranges of X and Y are 0.4-0.6.
The plant DO control range (DO L ，DO H ) Typically selected within the interval of 0.9-1.5 mg/L.
Application method 1: when dissolved oxygen in real time (DO L ，DO H ) Within the range;
at this time, the biochemical environment is relatively stable, and the calculation method 1 is adopted.
Application method 2: when the real-time dissolved oxygen is less than DO L ；
When a is less than or equal to 1, adopting an A multiplied by calculation method 3+B multiplied by the comprehensive calculation of the calculation method 2;
the value range of A is 0.1-0.3, and the value range of B is 0.7-0.9;
when a >1, a comprehensive calculation of a×calculation method 3+B ×calculation method 1 is adopted;
the value range of A is 0.1-0.3, and the value range of B is 0.7-0.9;
application method 3: when the real-time dissolved oxygen is greater than DO H ；
When a is less than or equal to 1, adopting an A multiplied by calculation method 1+B multiplied by the comprehensive calculation of the calculation method 2;
the value range of A is 0.4-0.6, and the value range of B is 0.4-0.6;
when a >1, a comprehensive calculation of a×calculation method 1+B ×calculation method 2 is adopted;
the value range of A is 0.6-0.8, and the value range of B is 0.2-0.4;
after aeration control is performed, dissolved oxygen keeps stability in a control range to be more than 85%, the air-water ratio of the sewage plant is maintained in a range of 3.0-3.5, and effluent water stably reaches the first grade A standard in GB18918-2002, so that the purposes of stabilizing dissolved oxygen in an aerobic tank and 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 (7)
1. A precise aeration air volume computing system is characterized in that,
the precise aeration air volume calculation system comprises a data acquisition unit, a data analysis unit and a fan control unit;
the data acquisition unit 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 pool liquid level meter, a water inlet ammonia nitrogen online determinator, a water outlet ammonia nitrogen online determinator, a water inlet total nitrogen (Kjeldahl) online determinator, a water outlet total nitrogen (Kjeldahl) online determinator, a biochemical pool thermometer and a thermal air flowmeter;
the data analysis unit comprises a feedforward calculation subsystem and a feedback auxiliary calculation subsystem, and comprehensive air quantity is obtained according to comprehensive calculation of feedforward and feedback;
the fan control unit feeds the comprehensive air quantity back to the fan so as to dynamically control the air quantity.
2. The accurate aeration air volume control method is applied to the accurate aeration air volume calculation system and comprises the following steps:
the data analysis unit inputs the DO demand control range (DO L ，DO H )；
Collecting data of each instrument through the data collecting unit;
the feedforward calculation subsystem is used for calculating the oxygen demand of different scenes based on the data acquired by the data acquisition unit, wherein the oxygen demand of different scenes is calculated by utilizing the acquired water quality and water quantity of the water inlet and the operation process parameters according to different water quality changes and water quality load changes;
the feedback auxiliary calculation subsystem is used for obtaining the comprehensive oxygen demand by combining application methods of different dissolved oxygen environments based on the oxygen demand calculation result, converting the comprehensive oxygen demand into the comprehensive air quantity, and performing comprehensive calculation on the oxygen demand calculation result of different scenes according to the dissolved oxygen environments by using the application methods of different dissolved oxygen environments.
The fan control unit feeds the comprehensive air quantity back to the fan so as to dynamically control the air quantity.
3. The precise aeration air volume control method according to claim 2, wherein,
the calculation formula of the oxygen demand is as follows: s=a× (our×v-b×θ+n), where S is aeration oxygen demand, kg/h; OUR is the oxygen consumption rate g/(L.h) of the activated sludge; v is the effective 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 generally takes a value of 1.5-1.7; n is the trend amount caused by nitrogen, kg/h; a is a correction coefficient related to carbon and nitrogen of the inlet water.
4. A method for controlling the air quantity of precise aeration according to claim 3, wherein,
the calculation formula of the correction coefficient a is as follows:
wherein L is C gCOD/(gMLSS.d) or gCOD/(m) is the COD load at the present time 3 ·d)；L Ct gCOD/(gMLSS.d) or gCOD/(m) is the average value of COD load within t hours before the current moment 3 ·d)；L N gNH for the current ammonia nitrogen load 3 N/(gMLSS.d) or gNH 3 -N/(m 3 ·d)；L Nt Is the average value of ammonia nitrogen load in t hours before the current moment, gNH 3 N/(gMLSS.d) or gNH 3 -N/(m 3 D) a step of; x and Y are influence coefficients of inflow COD and ammonia nitrogen on the aeration rate of the plant respectively, and can be adjusted according to the site conditions, and the value ranges of X and Y are 0-1;
the calculation formula of the trend quantity N is as follows:
5. A method for controlling the air volume of precise aeration according to claim 3, wherein 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 range of t is 12-24 hours;
oxygen demand of the excess sludge
The 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.
6. A precise aeration air volume control method according to claim 3-6, characterized in that,
the oxygen demand calculation forms the following three calculation methods according to the change of water quantity and water quality load:
the calculation method 1 comprises the following steps:
when 0.999< a <1.001 and the water amount change is less than 5%, a=1 and n=0 in the oxygen demand calculation formula;
the calculation method 2 comprises the following steps:
when a is out of the range of (0.999,1.001), or the variation of the inflow water amount is more than 5%, if
The correction coefficient a is a coefficient caused by carbon and nitrogen changes in water quality, and the trend amount N of nitrogen does not need to be increased at the moment, so N=0;
the calculation method 3:
when a is out of the range of (0.999,1.001), or the variation of the inflow water amount is more than 5%, if
At this time, both the a value and the N value are calculated.
7. The precise aeration air volume control method according to claim 7, wherein,
according to different dissolved oxygen environments, an air volume application method is used to obtain comprehensive air volume;
application method 1: when dissolved oxygen in real time (DO L ，DO H ) Within the range;
at this time, the biochemical environment is relatively stable, and a calculation method 1 is adopted;
application method 2: when the real-time dissolved oxygen is less than DO L ；
When a is less than or equal to 1, adopting an A multiplied by the calculation method 3+B multiplied by the calculation method 2;
when a >1, the comprehensive calculation of "a×calculation method 3+B ×calculation method 1" is adopted;
application method 3: when the real-time dissolved oxygen is greater than DO H ；
When a is less than or equal to 1, adopting an A multiplied by the calculation method 1+B multiplied by the calculation method 2;
when a >1, the comprehensive calculation of "a×calculation method 1+B ×calculation method 2" is adopted;
wherein A and B represent the proportion of two calculation methods in the comprehensive mode respectively in calculation, and can be modified according to project implementation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211476681.XA CN116239233A (en) | 2022-11-23 | 2022-11-23 | Accurate aeration air volume calculation system and air volume control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211476681.XA CN116239233A (en) | 2022-11-23 | 2022-11-23 | Accurate aeration air volume calculation system and air volume control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116239233A true CN116239233A (en) | 2023-06-09 |
Family
ID=86628397
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211476681.XA Pending CN116239233A (en) | 2022-11-23 | 2022-11-23 | Accurate aeration air volume calculation system and air volume control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116239233A (en) |
-
2022
- 2022-11-23 CN CN202211476681.XA patent/CN116239233A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Desloover et al. | Floc-based sequential partial nitritation and anammox at full scale with contrasting N2O emissions | |
| CN110510740B (en) | Sewage simultaneous nitrification and denitrification aeration control system and aeration method | |
| US8216517B2 (en) | System and method for monitoring an integrated system | |
| Huang et al. | Impacts of dissolved oxygen control on different greenhouse gas emission sources in wastewater treatment process | |
| CN106082430B (en) | A kind of aeration control system and aeration control method | |
| CN113044973B (en) | Sewage treatment control system and effluent TN control method | |
| JP3961835B2 (en) | Sewage treatment plant water quality controller | |
| CN104090488B (en) | The method that sewage plant controls dissolved oxygen, sludge loading and sludge age in real time automatically | |
| KR101325659B1 (en) | Apparatus for controlling aeration system by nitrification reaction in Sequencing Batch Reactor | |
| CN113104961B (en) | Real-time aeration accurate control method based on activated sludge treatment sewage process | |
| CN205740480U (en) | A kind of biological tank intelligence aerating system | |
| CN112782975A (en) | Sewage treatment aeration intelligent control method and system based on deep learning | |
| CN210595439U (en) | System for effect is carried in consumption reduction suitable for biological denitrogenation of oxidation ditch | |
| CN112875859A (en) | Sewage nitrogen and phosphorus removal control system based on AOA technology | |
| CN114132980B (en) | Short-range intelligent accurate aeration control method, equipment and system for sewage treatment | |
| CN111072140B (en) | Carbon source adding amount on-line calculation method based on denitrification process of anoxic tank | |
| CN114538612A (en) | External carbon source accurate dosing system and control method thereof | |
| CN116239233A (en) | Accurate aeration air volume calculation system and air volume control method thereof | |
| CN110436626A (en) | A kind of Anammox coupling denitrification Composite denitrification system and quick start method | |
| CN111217449B (en) | Sewage treatment device and method based on accurate control of oxygen input | |
| CN115259413B (en) | Air quantity control method for accurate aeration system | |
| CN212293020U (en) | Intermittent aeration control device of sewage plant | |
| CN114538538A (en) | Total nitrogen control system and method for sewage plant | |
| CN113354069A (en) | MBR process accurate aeration control system and method | |
| CN117509882A (en) | Predictive accurate aeration method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |