CN110204067B - Aeration control system and method - Google Patents
Aeration control system and method Download PDFInfo
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- CN110204067B CN110204067B CN201910620544.0A CN201910620544A CN110204067B CN 110204067 B CN110204067 B CN 110204067B CN 201910620544 A CN201910620544 A CN 201910620544A CN 110204067 B CN110204067 B CN 110204067B
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- 238000005273 aeration Methods 0.000 title claims abstract description 226
- 238000000034 method Methods 0.000 title claims abstract description 37
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 156
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 138
- 239000001301 oxygen Substances 0.000 claims abstract description 138
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 138
- 239000007789 gas Substances 0.000 claims abstract description 123
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 238000005422 blasting Methods 0.000 claims description 21
- 239000010865 sewage Substances 0.000 claims description 20
- 238000013461 design Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 12
- 239000011159 matrix material Substances 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 7
- 238000005276 aerator Methods 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 239000010802 sludge Substances 0.000 claims description 5
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- 238000002795 fluorescence method Methods 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 description 21
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- C02F3/006—Regulation methods for biological treatment
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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
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
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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
- C02F2209/14—NH3-N
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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
- C02F2209/38—Gas 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
- C02F2209/40—Liquid flow rate
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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)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an aeration control system and method, comprising the following steps: the water inlet metering meter is arranged on a water inlet pipe of the aerobic tank; the first dissolved oxygen online instrument and the first ammonia nitrogen online instrument are respectively arranged at the tail end of a second-stage tank body in the aerobic tank; the second dissolved oxygen online instrument and the second ammonia nitrogen online instrument are respectively arranged at the tail end of a fourth-stage tank body in the aerobic tank; the four gas flow meters and the four electric valves are respectively arranged on the four aeration branch pipes; and the control device can perform dissolved oxygen feedforward and feedback aeration control, feedforward aeration compensation control and ammonia nitrogen aeration compensation control on aeration in the aerobic tank according to the needs by controlling the variable frequency blast equipment and four electric valves according to the received measured values of each instrument. The system and the method solve the problems that single dissolved oxygen feedback control is difficult to cope with water quality and water quantity fluctuation, stable control is realized by aeration, and meanwhile, the process reaches the standard, so that the system can operate efficiently and stably.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to an aeration control system and method.
Background
At present, due to the social development, the urban construction force is increased, the operation of urban sewage treatment plants enters a high-efficiency operation period, the sewage treatment is not only limited to reach the treatment standard, but also develops towards the directions of energy conservation, consumption reduction and the like, and responds to the social energy conservation and emission reduction targets. Most urban sewage treatment mainly uses domestic sewage, mature treatment processes comprise AAO, oxidation ditches and the like, and emerging MBR and the like, aeration modes of the urban sewage treatment generally comprise blast aeration and mechanical aeration, the energy consumption of an aeration system generally accounts for more than 50% in the sewage treatment process, the energy-saving technology of the aeration is studied more, and the urban sewage treatment is regulated based on Dissolved Oxygen (DO) feedback control, but the quality of the sewage treatment inflow water generally fluctuates greatly, a control system often has large delay and large hysteresis influence, so that the regulation effect of the system is poor; with the development of an automatic control process control system, feedforward control is added to solve the problems of water quantity, water quality fluctuation and the like, but chemical demand (COD) and ammonia Nitrogen (NH) of the inflow water also exist under the condition of water quality fluctuation 3 ) The instrument can not respond in real time, the fault rate of the instrument is higher, the reliability of the instrument is affected to a certain extent, and the control system has deviation.
Therefore, how to provide a stable control aeration device to make sewage treatment plant operate efficiently and stably under the premise of meeting the requirements of sewage treatment energy conservation and consumption reduction and process standard.
Disclosure of Invention
Based on the problems existing in the prior art, the invention aims to provide an aeration control system and an aeration control method, which can solve the problems that the existing aeration is controlled by single dissolved oxygen feedback, the fluctuation of water quality and water quantity is difficult to deal with and the stable control of the aeration is realized.
The invention aims at realizing the following technical scheme:
the embodiment of the invention provides an aeration control system, which is used for a sewage treatment system which is divided into four sections of tanks in a single-sequence aerobic tank, wherein a first aeration branch pipe, a second aeration branch pipe, a third aeration branch pipe and a fourth aeration branch pipe are respectively arranged in the four sections of tanks, and each aeration branch pipe is connected with variable-frequency blasting equipment through an aeration main pipeline, and comprises the following components:
the device comprises a water inlet metering meter, a first dissolved oxygen online meter, a second dissolved oxygen online meter, a first ammonia nitrogen online meter, a second ammonia nitrogen online meter, a first gas flowmeter, a second gas flowmeter, a third gas flowmeter, a fourth gas flowmeter, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve and a control device; wherein,
the water inlet metering meter is arranged on a water inlet pipe of the aerobic tank and is electrically connected with the control device;
the first dissolved oxygen on-line instrument and the first ammonia nitrogen on-line instrument are respectively arranged at the tail end of the second section of the tank body in the aerobic tank, and are electrically connected with the control device;
the second dissolved oxygen on-line instrument and the second ammonia nitrogen on-line instrument are respectively arranged at the tail end of a fourth-stage tank body in the aerobic tank, and are electrically connected with the control device;
the first gas flow meter, the second gas flow meter, the third gas flow meter and the fourth gas flow meter are respectively arranged at the front ends of the first aeration branch pipe to the fourth aeration branch pipe in the first-section pool body to the fourth-section pool body in the aerobic pool, and the first gas flow meter, the second gas flow meter, the third gas flow meter and the fourth gas flow meter are electrically connected with the control device;
the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are respectively arranged at the front ends of the first aeration branch pipe to the fourth aeration branch pipe in the first section of pool body to the fourth section of pool body in the aerobic pool, and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are electrically connected with the control device;
the control device can perform feedforward and feedback aeration compensation control, feedforward aeration compensation control and ammonia nitrogen aeration compensation control on aeration in the aerobic tank according to the needs by controlling the variable-frequency blasting equipment and the measured values of the first electric valve, the second electric valve, the third electric valve and the fourth electric valve according to the received water inlet metering meter, the first dissolved oxygen online meter, the second dissolved oxygen online meter, the first ammonia nitrogen online meter, the second ammonia nitrogen online meter, the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter.
The embodiment of the invention also provides an aeration control method which is used in the aeration control system and comprises the following steps:
the control device performs dissolved oxygen feedforward and feedback aeration control, feedforward aeration compensation control and ammonia nitrogen aeration compensation control on aeration in the aerobic tank according to the needs by controlling the variable-frequency blasting equipment and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve according to the received measured values of the water inlet metering meter, the first dissolved oxygen online meter, the second dissolved oxygen online meter, the first ammonia nitrogen online meter, the second ammonia nitrogen online meter, the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter; wherein,
the feed-forward and feedback aeration control of the dissolved oxygen is as follows:
setting a maximum aeration air quantity and a minimum aeration air quantity for keeping sludge from settling in a first section of pool body to a fourth section of pool body in the aerobic pool according to design parameters of the aerobic pool;
setting a set value of a first dissolved oxygen on-line instrument, controlling a second gas flowmeter to adjust the aeration air quantity of the second section of the aerobic Chi Nadi tank body through PID cascade feedback according to the deviation between the set value of the first dissolved oxygen on-line instrument and the measured value of the first dissolved oxygen on-line instrument, and adjusting the first electric valve to control the aeration air quantity of the first section of the tank body to be equal to the aeration air quantity of the second section of the tank body according to the aeration air quantity of the second section of the tank body;
setting a set value of a first ammonia nitrogen on-line instrument according to the concentration of the ammonia nitrogen of the influent water, calculating a change value of ammonia nitrogen according to the difference between the set value of the first ammonia nitrogen on-line instrument and the measured value of the first ammonia nitrogen on-line instrument, automatically distributing and adjusting the set value of a second dissolved oxygen on-line instrument according to the change value of the ammonia nitrogen according to a set adjustment period, controlling a fourth gas flowmeter to adjust the aeration air quantity of a fourth section of pool body in the aerobic pool through PID cascade feedback according to the deviation between the set value of the second dissolved oxygen on-line instrument and the measured value of the second dissolved oxygen on-line instrument, and adjusting a third electric valve to control the aeration air quantity of a third section of pool body to be equal to the aeration air quantity of the fourth section of pool body according to the aeration air quantity of the fourth section of pool body;
the feedforward aeration compensation control is as follows:
when the inflow Q of the aerobic tank exceeds the preset amplitude of the normal inflow, feedforward aeration compensation is carried out, and the feedforward compensation air quantity is as follows: o (O) q ＝Y×Q Is provided with ×(Q Real world /Q Is provided with -1)；
Wherein: o (O) q : feedforward compensation gas quantity;
y: designing the ratio of aeration air quantity to design treatment water quantity;
Q is provided with : designing water inflow;
Q real world : actual water inflow;
uniformly compensating the feedforward compensation gas quantity to a first section of pool body to a fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve;
the ammonia nitrogen aeration compensation control is as follows:
setting a set value of the second ammonia nitrogen on-line instrument according to a water discharge standard, and when the measured value of the second ammonia nitrogen on-line instrument exceeds the set value of the second ammonia nitrogen on-line instrument, performing feedback aeration compensation, wherein the feedback compensation gas quantity is as follows: o (O) f ＝b×Q Real world ×N c ×K 0 /E A /0.28；
Wherein: o (O) f : the amount of the compensation gas is fed back;
b: the oxygen demand for oxidizing ammonia nitrogen is 4.57;
Q real world : is the actual water inflow;
N c : the actual measurement value of the second ammonia nitrogen on-line instrument is the difference value between the actual measurement value of the second ammonia nitrogen on-line instrument and the set value of the second ammonia nitrogen on-line instrument;
E A : the oxygen utilization rate of the aerator;
K 0 : is the oxygen demand correction coefficient;
and uniformly compensating the feedback compensation gas quantity to the first section of pool body to the fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve.
As can be seen from the technical scheme provided by the invention, the aeration control system and method provided by the embodiment of the invention have the beneficial effects that:
the method comprises the steps that a first dissolved oxygen on-line instrument, a second dissolved oxygen on-line instrument, a first ammonia nitrogen on-line instrument and a second ammonia nitrogen on-line instrument are respectively arranged in an aerobic tank divided into four sections of tank bodies, and a water inlet metering meter is arranged on a water inlet pipe of the aerobic tank, so that a control device can receive measured values of the first dissolved oxygen on-line instrument, the second dissolved oxygen on-line instrument, the first ammonia nitrogen on-line instrument, the second ammonia nitrogen on-line instrument and the water inlet metering meter, and further according to dissolved oxygen and ammonia nitrogen values in each section of the aerobic tank, a dissolved oxygen feedforward and feedback aeration control mode can be adopted, dissolved oxygen and ammonia nitrogen are respectively used as control variables, and the air quantity of the aerobic tank can be distributed and regulated; performing feedforward aeration compensation according to the fluctuation condition of the inflow water flow, and performing ammonia nitrogen aeration compensation aiming at the out-of-water ammonia nitrogen exceeding of the aerobic tank; the feed-forward control of ammonia nitrogen is introduced to control dissolved oxygen and simultaneously combined with the feed-forward control of dissolved oxygen, and the feed-forward aeration compensation and the feed-back aeration compensation are adopted, so that the problems that the single feed-forward control of dissolved oxygen is difficult to cope with fluctuation of water quality and water quantity and stable control of aeration is realized, and meanwhile, the process reaches the standard, and the efficient and stable operation of the system is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present 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 diagram of an aeration control system according to an embodiment of the present invention;
FIG. 2 is a flowchart of an aeration control method according to an embodiment of the present invention;
each marked in the figure is: 1-an electrical control cabinet; 11-electrical cabinet equipment switches; 12-relay; 13-connecting terminals; 2-an automatic control cabinet; 21-a PLC power supply; 22-an input-output module; 23-meter switch; 24-an industrial personal computer; 31-a first ammonia nitrogen on-line instrument; 32-a second ammonia nitrogen on-line instrument; 41-a first dissolved oxygen on-line meter; 42-a second dissolved oxygen on-line meter; 51-a first gas flow meter; 52-a second gas flow meter; 53-a third gas flow meter; 54-a fourth gas flow meter; 61-a first electrically operated valve; 62-a second electrically operated valve; 63-a third electrically operated valve; 64-fourth electric valve; 7-a water inlet flowmeter; 8-frequency conversion blower equipment.
Detailed Description
The following description of the embodiments of the present invention will clearly and fully describe the technical solutions of the embodiments of the present invention in conjunction with the specific contents of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. What is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art.
As shown in fig. 1, the embodiment of the invention provides an aeration control system, which is suitable for controlling the concentration of ammonia nitrogen and dissolved oxygen in an aeration unit of a municipal sewage treatment plant, can improve the stable control level of the aeration system and realize the reduction of energy consumption of the aeration system, and is used for a sewage treatment system divided into four sections of tanks in an aerobic tank, wherein a first aeration branch pipe, a second aeration branch pipe, a third aeration branch pipe and a fourth aeration branch pipe are respectively arranged in the four sections of tanks, and each aeration branch pipe is connected with variable-frequency air blasting equipment through an aeration main pipeline, and comprises the following steps:
the device comprises a water inlet metering meter, a first dissolved oxygen online meter, a second dissolved oxygen online meter, a first ammonia nitrogen online meter, a second ammonia nitrogen online meter, a first gas flowmeter, a second gas flowmeter, a third gas flowmeter, a fourth gas flowmeter, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve and a control device; wherein,
the water inlet metering meter is arranged on a water inlet pipe of the aerobic tank and is electrically connected with the control device;
the first dissolved oxygen on-line instrument and the first ammonia nitrogen on-line instrument are respectively arranged at the tail end of the second section of the tank body in the aerobic tank, and are electrically connected with the control device;
the second dissolved oxygen on-line instrument and the second ammonia nitrogen on-line instrument are respectively arranged at the tail end of a fourth-stage tank body in the aerobic tank, and are electrically connected with the control device;
the first gas flow meter, the second gas flow meter, the third gas flow meter and the fourth gas flow meter are respectively arranged at the front ends of the first aeration branch pipe to the fourth aeration branch pipe in the first-section pool body to the fourth-section pool body in the aerobic pool, and the first gas flow meter, the second gas flow meter, the third gas flow meter and the fourth gas flow meter are electrically connected with the control device;
the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are respectively arranged at the front ends of the first aeration branch pipe to the fourth aeration branch pipe in the first section of pool body to the fourth section of pool body in the aerobic pool, and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are electrically connected with the control device;
the control device can perform dissolved oxygen feedforward and feedback aeration control, feedforward aeration compensation control and ammonia nitrogen aeration compensation control on aeration in the aerobic tank according to the needs by controlling the variable-frequency blasting equipment and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve according to the received measured values of the water inlet metering meter, the first dissolved oxygen online meter, the second dissolved oxygen online meter, the first ammonia nitrogen online meter, the second ammonia nitrogen online meter, the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter.
In the system, the control device can perform dissolved oxygen feedforward and feedback aeration control, feedforward aeration compensation control and ammonia nitrogen aeration compensation control on aeration in the aerobic tank according to the received measured values of the water inlet metering meter, the first dissolved oxygen on-line meter, the second dissolved oxygen on-line meter, the first ammonia nitrogen on-line meter, the second ammonia nitrogen on-line meter, the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter by controlling the variable frequency blasting equipment and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve,
the feed-forward and feedback aeration control of the dissolved oxygen is as follows:
setting a maximum aeration air quantity and a minimum aeration air quantity for keeping sludge from settling in a first section of pool body to a fourth section of pool body in the aerobic pool according to design parameters of the aerobic pool; the maximum aeration air quantity is in order to prevent the frequency of the air blower from being too high, the minimum aeration air quantity is in order to prevent mud deposition in the aerobic tank, and the maximum aeration air quantity and the minimum aeration air quantity limit the adjusting range of the air blower;
setting a set value of a first dissolved oxygen on-line instrument (the set value is controlled to be 0.5-1 mg/L, and can be practically set according to experience), controlling a second gas flowmeter to adjust the aeration air quantity of the aerobic Chi Nadi two-section tank body through PID cascade feedback control according to the deviation of the set value of the first dissolved oxygen on-line instrument and the measured value of the first dissolved oxygen on-line instrument, and adjusting the aeration air quantity of the first electric valve to control the aeration air quantity of the first section tank body to be equal to the aeration air quantity of the second section tank body according to the aeration air quantity of the second section tank body;
setting a set value of a first ammonia nitrogen on-line instrument according to the concentration of the ammonia nitrogen of the influent water, calculating a change value of ammonia nitrogen according to the difference between the set value of the first ammonia nitrogen on-line instrument and the measured value of the first ammonia nitrogen on-line instrument, automatically distributing and adjusting the set value of a second dissolved oxygen on-line instrument according to the change value of the ammonia nitrogen according to a set adjustment period, controlling a fourth gas flowmeter to adjust the aeration air quantity of a fourth section of pool body in the aerobic pool through PID cascade feedback according to the deviation between the set value of the second dissolved oxygen on-line instrument and the measured value of the second dissolved oxygen on-line instrument, and adjusting a third electric valve to control the aeration air quantity of a third section of pool body to be equal to the aeration air quantity of the fourth section of pool body according to the aeration air quantity of the fourth section of pool body;
the feedforward aeration compensation control is as follows:
when the inflow Q of the aerobic tank exceeds the preset amplitude of the normal inflow, feedforward aeration compensation is carried out, and the feedforward compensation air quantity is as follows: o (O) q ＝Y×Q Is provided with ×(Q Real world /Q Is provided with -1)；
Wherein: o (O) q : feedforward compensation gas quantity;
y: designing the ratio of aeration air quantity to design treatment water quantity;
Q is provided with : designing water inflow;
Q real world : actual water inflow;
uniformly compensating the feedforward compensation gas quantity to a first section of pool body to a fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve;
the ammonia nitrogen aeration compensation control is as follows:
setting a set value of the second ammonia nitrogen on-line instrument according to a water discharge standard, and when the measured value of the second ammonia nitrogen on-line instrument exceeds the set value of the second ammonia nitrogen on-line instrument, performing feedback aeration compensation, wherein the feedback compensation gas quantity is as follows: o (O) f ＝b×Q Real world ×N c ×K 0 /E A /0.28；
Wherein: o (O) f : the amount of the compensation gas is fed back;
b: the oxygen demand for oxidizing ammonia nitrogen is 4.57;
Q real world : is the actual water inflow;
N c : the actual measurement value of the second ammonia nitrogen on-line instrument is the difference value between the actual measurement value of the second ammonia nitrogen on-line instrument and the set value of the second ammonia nitrogen on-line instrument;
E A : the oxygen utilization rate of the aerator;
K 0 : for the oxygen demand correction factor, the oxygen demand correction factor is related to water temperature and oxygen partial pressure, and is calculated according to a formula, and the detailed formula and the description are obtained according to a design manual (such as a design manual of a sewage treatment system or a water supply and drainage design manual);
and uniformly compensating the feedback compensation gas quantity to the first section of pool body to the fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve.
And controlling the frequency of the variable-frequency blasting equipment to reach the required air quantity according to PID cascade feedback air quantity, feedforward compensation air quantity and ammonia nitrogen feedback compensation air quantity in a feedback mode.
In the system, in the feed-forward and feedback aeration control of the dissolved oxygen, the set value of the second dissolved oxygen on-line instrument is automatically distributed and regulated according to the change value of ammonia nitrogen according to a set regulation period, and the set value is as follows:
under the steady operation state of the aerobic tank, the optimal control range of dissolved oxygen is obtained according to the change value of ammonia nitrogen: Δdo=k×Δnh 3 +b, wherein Δdo: an adjustment amount for dissolved oxygen; ΔNH 3 : is the change value of ammonia nitrogen; k. b is a constant, and the values are-1 and 0.5 respectively, and further, in practice, k and b can be determined through experiments;
setting a set value of a first ammonia nitrogen on-line instrument as a certain interval, and adjusting a matrix according to different ammonia nitrogen change values in the set interval; and during automatic operation, automatically matching and adjusting the set value of the second dissolved oxygen online instrument according to the change value of ammonia nitrogen and the dissolved oxygen adjustment matrix.
In the system, the set adjustment period of the dissolved oxygen feedforward and feedback aeration control is set to be 0.5h according to the change value of ammonia nitrogen and the set value of the second dissolved oxygen on-line instrument.
In the system, a water inlet electromagnetic flowmeter is adopted as the water inlet flowmeter;
the first ammonia nitrogen on-line instrument and the second ammonia nitrogen on-line instrument adopt an electrode method ammonia nitrogen on-line instrument;
the first dissolved oxygen online instrument and the second dissolved oxygen online instrument are both dissolved oxygen online instruments by adopting a fluorescence method;
the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter are all thermal type gas mass flowmeters;
the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are all electric diamond valves;
the variable frequency air blast equipment adopts air suspension variable frequency air blast equipment.
Preferably, the control device adopts an automatic control cabinet, and a PLC power supply, an input/output module, an instrument switch, an industrial personal computer and the like are arranged in the automatic control cabinet. The variable-frequency air blast equipment is electrically controlled by adopting an electrical control cabinet, and an electrical cabinet equipment switch, a relay, a wiring terminal and the like are arranged in the electrical control cabinet.
Referring to fig. 2, the embodiment of the invention further provides an aeration control method, which is used in the aeration control system and includes the following steps:
the control device performs dissolved oxygen feedforward and feedback aeration control, feedforward aeration compensation control and ammonia nitrogen aeration compensation control on aeration in the aerobic tank according to the needs by controlling the variable-frequency blasting equipment and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve according to the received measured values of the water inlet metering meter, the first dissolved oxygen online meter, the second dissolved oxygen online meter, the first ammonia nitrogen online meter, the second ammonia nitrogen online meter, the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter; wherein,
the feed-forward and feedback aeration control of the dissolved oxygen is as follows:
setting a maximum aeration air quantity and a minimum aeration air quantity for keeping sludge from settling in a first section of pool body to a fourth section of pool body in the aerobic pool according to design parameters of the aerobic pool;
setting a set value of a first dissolved oxygen on-line instrument, controlling a second gas flowmeter to adjust the aeration air quantity of the second section of the aerobic Chi Nadi tank body through PID cascade feedback according to the deviation between the set value of the first dissolved oxygen on-line instrument and the measured value of the first dissolved oxygen on-line instrument, and adjusting the first electric valve to control the aeration air quantity of the first section of the tank body to be equal to the aeration air quantity of the second section of the tank body according to the aeration air quantity of the second section of the tank body;
setting a set value of a first ammonia nitrogen on-line instrument according to the concentration of the ammonia nitrogen of the inflow water (in practice, the set value can be obtained by accounting according to the inflow water and the reflux quantity), calculating a change value of ammonia nitrogen according to the difference between the set value of the first ammonia nitrogen on-line instrument and the actual measurement value of the first ammonia nitrogen on-line instrument, automatically distributing and adjusting the set value of a second dissolved oxygen on-line instrument according to the change value of ammonia nitrogen according to a set adjustment period, controlling a fourth gas flowmeter to adjust the aeration air quantity of a fourth electric valve to the fourth section of pool body in the aerobic pool through PID cascade feedback according to the deviation between the set value of the second dissolved oxygen on-line instrument and the actual measurement value of the second dissolved oxygen on-line instrument, and adjusting the aeration air quantity of a third electric valve to control the aeration air quantity of the third section of pool body to be equal to the aeration air quantity of the fourth section of pool body according to the aeration air quantity of the fourth section of pool body;
the feedforward aeration compensation control is as follows:
when the inflow Q of the aerobic tank exceeds the preset amplitude of the normal inflow, feedforward aeration compensation is carried out, and the feedforward compensation air quantity is as follows: o (O) q ＝Y×Q Is provided with ×(Q Real world /Q Is provided with -1)；
Wherein: o (O) q : feedforward compensation gas quantity;
y: designing the ratio of aeration air quantity to design treatment water quantity;
Q is provided with : designing water inflow;
Q real world : actual water inflow;
uniformly compensating the feedforward compensation gas quantity to a first section of pool body to a fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve;
the ammonia nitrogen aeration compensation control is as follows:
setting a set value of the second ammonia nitrogen on-line instrument according to a water discharge standard, and when the measured value of the second ammonia nitrogen on-line instrument exceeds the set value of the second ammonia nitrogen on-line instrument, performing feedback aeration compensation, wherein the feedback compensation gas quantity is as follows: o (O) f ＝b×Q Real world ×N c ×K 0 /E A /0.28；
Wherein: o (O) f : the amount of the compensation gas is fed back;
b: the oxygen demand for oxidizing ammonia nitrogen is 4.57;
Q real world : is the actual water inflow;
N c : the actual measurement value of the second ammonia nitrogen on-line instrument is the difference value between the actual measurement value of the second ammonia nitrogen on-line instrument and the set value of the second ammonia nitrogen on-line instrument;
E A : the oxygen utilization rate of the aerator;
K 0 : the oxygen demand correction coefficient is calculated according to a formula and is obtained according to a design manual corresponding to the sewage treatment system, wherein the oxygen demand correction coefficient is related to water temperature and oxygen partial pressure;
and uniformly compensating the feedback compensation gas quantity to the first section of pool body to the fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve.
In the dissolved oxygen feedforward and feedback aeration control of the method, the set value of the second dissolved oxygen on-line instrument is automatically distributed and regulated according to the change value of ammonia nitrogen according to the set regulation period, and the set value is as follows:
under the steady operation state of the aerobic tank, the optimal control range of dissolved oxygen is obtained according to the change value of ammonia nitrogen: deltaDO＝k×ΔNH 3 +b, wherein Δdo: is the optimal control range of dissolved oxygen; ΔNH 3 : is the change value of ammonia nitrogen; k. b is a constant, and the values are-1 and 0.5 respectively, and further, in practice, k and b can be determined through experiments;
setting a set value of a first ammonia nitrogen on-line instrument as a certain interval, and adjusting a matrix according to different ammonia nitrogen change values in the set interval; and during automatic operation, automatically matching and adjusting the set value of the second dissolved oxygen online instrument according to the change value of ammonia nitrogen and the dissolved oxygen adjustment matrix.
In the dissolved oxygen feedforward and feedback aeration control of the method, the set adjustment period in the set value of the second dissolved oxygen on-line instrument is automatically distributed and adjusted according to the set adjustment period and the change value of ammonia nitrogen to be 0.5h.
According to the aeration control system and method, aeration control is performed based on ammonia nitrogen and Dissolved Oxygen (DO), an online instrument and control device are arranged, a dissolved oxygen feedforward and feedback aeration control mode is adopted, and the dissolved oxygen and the ammonia nitrogen are respectively used as control variables to perform distribution adjustment on the air quantity of the aerobic tank. Meanwhile, feedforward compensation is implemented according to the fluctuation condition of the inflow water flow, and ammonia nitrogen aeration compensation is performed aiming at the out-of-water ammonia nitrogen exceeding of the aerobic tank; by introducing ammonia Nitrogen (NH) 3 ) The feedforward control DO and the DO feedback control are combined at the same time, and through feedforward and feedback aeration compensation, the problems that single DO feedback control is difficult to cope with water quality and water quantity fluctuation and aeration is stable are solved, and meanwhile, the process reaches the standard, so that the efficient and stable operation of the system is realized.
The invention will now be described in further detail with reference to the drawings and examples.
The embodiment of the invention provides an aeration control system which is suitable for sewage treatment processes such as AAO and the like and stably controls aeration air quantity, namely DO and NH in real time according to an aerobic tank 3 The aeration air quantity is controlled in a feedback mode, and the air quantity is compensated according to the fluctuation of the water inflow and the water quality of the water outlet, and the method specifically comprises the following steps:
(1) Referring to FIG. 1, the interior of a single group of aerobic tanks is divided into four sections of tanks, and a first section of tank end and a second section of tank end are respectively provided with a first section of tank end and a second section of tank endThe dissolved oxygen on-line meters are respectively 1#DO and 2#DO, the tail end of the second section of pool body and the tail end of the fourth section of pool body are respectively provided with a first ammonia nitrogen on-line meter and a second ammonia nitrogen on-line meter which are respectively 1#NH 3 、2#NH 3 The method comprises the steps of carrying out a first treatment on the surface of the The first section of pool body to the fourth section of pool body are internally provided with a first aeration branch pipe to a fourth aeration branch pipe respectively, and the inlet of each aeration branch pipe is provided with a gas flowmeter (namely a first gas flowmeter, a second gas flowmeter, a third gas flowmeter and a fourth gas flowmeter) and an electric valve (namely a first electric valve, a second electric valve, a third electric valve and a fourth electric valve); the variable-frequency air blast equipment adjusts the air quantity through a variable-frequency mode or a guide vane;
setting the maximum aeration air quantity and the minimum aeration air quantity of a single-stage tank body in the aerobic tank according to design parameters, and ensuring that sludge in a single Duan Chi body does not settle;
referring to fig. 2, (2) dissolved oxygen feed-forward and feedback aeration control:
setting the concentration of 1#DO as a certain value (such as 1mg/L, adjusting in real time according to control requirements), adjusting the aeration air quantity of the first-stage tank body through PID cascade feedback control according to the deviation of the set value of 1#DO and an actual measured value, setting the aeration air quantity of the second-stage tank body to be equal to the aeration air quantity of the first-stage tank body, and adjusting the aeration air quantity of the second-stage tank body according to the aeration air quantity;
(3) Setting 1#NH 3 Is a certain value as a set value according to the real-time 1#NH 3 NH is obtained by the difference between the set value and the measured value 3 Change value ΔNH of (2) 3 According to NH 3 Automatically distributing and adjusting the set value of the 2#DO by the change value;
DO regulation ΔDO is obtained according to empirical value, 1#NH 3 Setting the set values to different sections, and setting the set values to different NH under stable operation 3 The optimal control range of DO is obtained under the condition of a change value: Δdo=k×Δnh 3 +b, k, b are constants, which can be determined experimentally;
different NH 3 Obtaining DO adjustment matrix under the set interval; when the system is automatically operated, according to delta NH 3 The size is automatically matched and adjusted to the set value of 2#DO according to the DO adjustment matrix; NH (NH) 3 DO set point adjustment period of 0.5h；
According to the deviation of the set value of 2#DO and the measured value, the aeration air quantity of the fourth-section tank body is controlled through PID cascade feedback, the aeration air quantity of the third-section tank body is set to be equal to the aeration air quantity of the fourth-section tank body, and the aeration air quantity of the third-section tank body is regulated according to the aeration air quantity;
(4) Feedforward aeration compensation control:
the water inflow Q exceeds a certain amplitude (such as 15 percent, can be set), and the feedforward aeration compensation is started, wherein the feedforward compensation air quantity is as follows: o (O) q ＝Y×Q Is provided with ×(Q Real world /Q Is provided with -1)；
Wherein: o (O) q : compensating the gas value for feedforward;
y: designing the ratio of aeration air quantity to design treatment water quantity;
Q is provided with : the water inflow is designed;
Q real world : is the actual water inflow;
uniformly compensating the feedforward compensation gas quantity to a first section of pool body to a fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve;
(5) Ammonia nitrogen feedback aeration compensation control:
setting 2#NH 3 Is a certain value as a set value, when the 2#NH is measured in real time 3 After the actual measurement value exceeds the set value, ammonia nitrogen feedback aeration compensation is carried out, and the feedback compensation gas quantity is as follows: o (O) f ＝b×Q Real world ×N c ×K 0 /E A /0.28；
O f : compensating the ammonia nitrogen feedback
b: the oxygen demand for oxidizing ammonia nitrogen is 4.57;
Q real world : is the actual water inflow;
N c : 2#NH 3 The difference between the measured value and the set value;
E A : oxygen utilization rate (constant given to aerator manufacturers) of the aerator;
K 0 : is thatOxygen demand correction factors, which are related to water temperature, oxygen partial pressure, calculated from formulas, detailed formulas and description obtained according to a design manual;
and uniformly compensating the feedback compensation gas quantity to the first section of pool body to the fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve.
The control system and the control method have at least the following beneficial effects: because the aeration is based on ammonia nitrogen and DO control, the aeration device can be widely applied to town sewage treatment aeration units; the control method takes process calculation as a basis, and can be widely applied to biochemical treatment by adopting a blast aeration system; an aerobic tank is used for partitioning, and the aeration air quantity of the second half area is controlled by an ammonia nitrogen value, so that the problem of delay adjustment of a system caused by water quality fluctuation is solved; the ammonia nitrogen in the aerobic tank is stable, the ammonia nitrogen testing precision is high, and the influence of large fluctuation and large delay on the system is solved; the control system is applied to the engineering of 5 ten thousand tons per day, can reduce the aeration energy consumption by more than 10 percent, and can greatly reduce the operation strength;
examples
The embodiment provides an aeration control system, and the applied process operation conditions are as follows: the sewage treatment plant in certain town has a scale of 5 ten thousand tons per day, the core process adopts an AAO process, the effluent is required to reach the A standard and NH standard of the discharge standard in certain place 3 The water yield is 1mg/L; the biochemical tanks are divided into 2 series, and each series of aerobic tanks is divided into 4 aeration galleries;
as shown in fig. 1, the aeration control system is provided with an electric control cabinet 1, an automatic control cabinet 2, wherein the electric control cabinet is provided with an equipment switch 11, a relay 12, a wiring terminal 13 and the like, and the automatic control cabinet (i.e. a control device) is internally provided with a PLC module, a PLC power supply 21, an input/output module 22, an instrument switch 23, an industrial personal computer 24 and the like;
2 ammonia nitrogen on-line meters (namely a first ammonia nitrogen on-line meter 31 and a second ammonia nitrogen on-line meter 32) and 2 fluorescence DO on-line meters (namely a first dissolved oxygen on-line meter 41 and a second dissolved oxygen on-line meter 42) are respectively installed at the tail end of a second corridor (namely a second section of the tank body) and the tail end of a fourth corridor (namely a fourth section of the tank body) of the single-sequence aerobic tank, a thermal gas mass flowmeter (namely a first gas flowmeter 51, a second gas flowmeter 52, a third gas flowmeter 53 and a fourth gas flowmeter 54) are installed on each aeration branch pipe, and electric diamond valves (namely a first electric valve 61, a second electric valve 62, a third electric valve 63 and a fourth electric valve 64) are installed on each aeration branch pipe;
a water inlet electromagnetic flowmeter (namely a water inlet flowmeter 7) is arranged on a water inlet pipe entering the aerobic tank;
the equipment and the instrument are connected with the electric cabinet and the automatic control cabinet through power lines and signal lines and controlled by the PLC module; the industrial personal computer is in communication connection with the automatic control cabinet;
the variable-frequency air blower device 8 adopts an air suspension air blower and is provided with a control cabinet, so that remote variable-frequency control can be realized;
the equipment and the instrument are installed and communication connection is established, and a control program is led into the PLC module;
referring to fig. 2, the aeration real-time control steps are as follows:
the control device collects and analyzes the water quality information (newly built water works according to the designed water quality) of the inflow water, and the average water quality of the inflow water NH is the whole year 3 The concentration is 35mg/L, the set value of the first ammonia nitrogen on-line instrument 31 is set to be 3.5mg/L according to the factors such as reflux dilution and the like, and the set value of the first dissolved oxygen on-line instrument 41 is set to be 1mg/L;
setting different intervals according to the first ammonia nitrogen on-line instrument 31 and the control range of the second dissolved oxygen on-line instrument 42, wherein the debugging values k and b are respectively 1 and 0.5 to obtain ammonia nitrogen delta NH under the control range 3 The DO regulation values are-1.5 mg/L, -0.5mg/L, 0mg/L, 1.5mg/L, 0.5mg/L, 1.5mg/L, 2.5mg/L and 3mg/L under the conditions of 2mg/L, 0mg/L, 0.5mg/L, 1.5mg/L, 2.5mg/L and 3mg/L respectively, and the control minimum value of the second dissolved oxygen on-line instrument 42 is set to be 1.5mg/L and the maximum value is set to be 3.5mg/L;
the amount of water intake (single sequence) confirmed from the water intake flowmeter 7 lasted for 30min exceeding 1198m 3 /h or less than 1010m 3 And starting feedforward aeration compensation at the time of/h, wherein the feedforward compensation gas quantity is O q ＝6.5×1042×(Q Real world 1042-1), feedforward offsetThe first to fourth aeration galleries (namely first to fourth sections of tank bodies) are equally divided into the aerobic tank;
setting the set value of a second ammonia nitrogen on-line instrument 32 at the water outlet to be 0.5mg/L, starting ammonia nitrogen feedback aeration compensation when the actual measurement value of the second ammonia nitrogen on-line instrument 32 exceeds the set value, wherein the feedback compensation air quantity is O f ＝4.57×Q Real world ×N c X 1.759/0.25/0.28, equally dividing the feedback compensation gas quantity to the first to fourth aeration galleries (namely the first to fourth sections of tank bodies) in the aerobic tank;
during the operation of the system, the second ammonia nitrogen on-line instrument 32 basically keeps the upper and lower amplitude of 0.4mg/L, the system can quickly respond to carry out air volume compensation after the water quantity impact fluctuation, and when the abnormal faults of the main instrument value cannot be automatically repaired, the system is switched to a constant aeration mode, so that the system is prevented from being controlled by error signals. After 3 months of operation, the control system can control the aeration system more stably, compared with the energy saving of the blower at the same time, the energy saving of the blower is 11.5%, the reasonable control of the aeration water outlet index effect is obvious, and the system can be basically stabilized within the discharge standard A.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. The aeration control method is characterized by being used in an aeration control system which is used in a sewage treatment system divided into four sections of tanks in a single-sequence aerobic tank, wherein a first aeration branch pipe, a second aeration branch pipe, a third aeration branch pipe and a fourth aeration branch pipe are respectively arranged in the four sections of tanks, and each aeration branch pipe is connected with variable-frequency blasting equipment through an aeration main pipeline and comprises the following steps:
the device comprises a water inlet metering meter, a first dissolved oxygen online meter, a second dissolved oxygen online meter, a first ammonia nitrogen online meter, a second ammonia nitrogen online meter, a first gas flowmeter, a second gas flowmeter, a third gas flowmeter, a fourth gas flowmeter, a first electric valve, a second electric valve, a third electric valve, a fourth electric valve and a control device; wherein,
the water inlet metering meter is arranged on a water inlet pipe of the aerobic tank and is electrically connected with the control device;
the first dissolved oxygen on-line instrument and the first ammonia nitrogen on-line instrument are respectively arranged at the tail end of the second section of the tank body in the aerobic tank, and are electrically connected with the control device;
the second dissolved oxygen on-line instrument and the second ammonia nitrogen on-line instrument are respectively arranged at the tail end of a fourth-stage tank body in the aerobic tank, and are electrically connected with the control device;
the first gas flow meter, the second gas flow meter, the third gas flow meter and the fourth gas flow meter are respectively arranged at the front ends of the first aeration branch pipe to the fourth aeration branch pipe in the first-section pool body to the fourth-section pool body in the aerobic pool, and the first gas flow meter, the second gas flow meter, the third gas flow meter and the fourth gas flow meter are electrically connected with the control device;
the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are respectively arranged at the front ends of the first aeration branch pipe to the fourth aeration branch pipe in the first section of pool body to the fourth section of pool body in the aerobic pool, and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are electrically connected with the control device;
the control device can perform dissolved oxygen feedforward and feedback aeration control, feedforward aeration compensation control and ammonia nitrogen aeration compensation control on aeration in the aerobic tank according to the received measured values of the water inlet metering meter, the first dissolved oxygen online meter, the second dissolved oxygen online meter, the first ammonia nitrogen online meter, the second ammonia nitrogen online meter, the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter by controlling the variable-frequency blasting equipment and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve;
the method comprises the following steps:
the control device performs dissolved oxygen feedforward and feedback aeration control, feedforward aeration compensation control and ammonia nitrogen aeration compensation control on aeration in the aerobic tank according to the requirements by controlling the variable-frequency blasting equipment and the first electric valve, the second electric valve, the third electric valve and the fourth electric valve according to the received measured values of the water inlet metering meter, the first dissolved oxygen online meter, the second dissolved oxygen online meter, the first ammonia nitrogen online meter, the second ammonia nitrogen online meter, the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter; wherein,
the feed-forward and feedback aeration control of the dissolved oxygen is as follows:
setting a maximum aeration air quantity and a minimum aeration air quantity for keeping sludge from settling in a first section of pool body to a fourth section of pool body in the aerobic pool according to design parameters of the aerobic pool;
setting a set value of a first dissolved oxygen on-line instrument, controlling a second gas flowmeter to adjust the aeration air quantity of the second section of the aerobic Chi Nadi tank body through PID cascade feedback according to the deviation between the set value of the first dissolved oxygen on-line instrument and the measured value of the first dissolved oxygen on-line instrument, and adjusting the first electric valve to control the aeration air quantity of the first section of the tank body to be equal to the aeration air quantity of the second section of the tank body according to the aeration air quantity of the second section of the tank body;
setting a set value of a first ammonia nitrogen on-line instrument according to the concentration of the ammonia nitrogen of the influent water, calculating a change value of ammonia nitrogen according to the difference between the set value of the first ammonia nitrogen on-line instrument and the measured value of the first ammonia nitrogen on-line instrument, automatically distributing and adjusting the set value of a second dissolved oxygen on-line instrument according to the change value of the ammonia nitrogen according to a set adjustment period, controlling a fourth gas flowmeter to adjust the aeration air quantity of a fourth section of pool body in the aerobic pool through PID cascade feedback according to the deviation between the set value of the second dissolved oxygen on-line instrument and the measured value of the second dissolved oxygen on-line instrument, and adjusting a third electric valve to control the aeration air quantity of a third section of pool body to be equal to the aeration air quantity of the fourth section of pool body according to the aeration air quantity of the fourth section of pool body;
the feedforward aeration compensation control is as follows:
when the inflow Q of the aerobic tank exceeds the preset amplitude of the normal inflow, feedforward aeration compensation is carried out, and the feedforward compensation air quantity is as follows: o (O) q =Y×Q Is provided with ×（Q Real world /Q Is provided with -1）；
Wherein: o (O) q : feedforward compensation gas quantity;
y: designing the ratio of aeration air quantity to design treatment water quantity;
Q is provided with : designing water inflow;
Q real world : actual water inflow;
uniformly compensating the feedforward compensation gas quantity to a first section of pool body to a fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve;
the ammonia nitrogen aeration compensation control is as follows:
setting a set value of the second ammonia nitrogen on-line instrument according to a water discharge standard, and when the measured value of the second ammonia nitrogen on-line instrument exceeds the set value of the second ammonia nitrogen on-line instrument, performing feedback aeration compensation, wherein the feedback compensation gas quantity is as follows: o (O) f = b×Q Real world ×N c ×K 0 /E A /0.28；
Wherein: o (O) f : the amount of the compensation gas is fed back;
b: the oxygen demand for oxidizing ammonia nitrogen is 4.57;
Q real world : is the actual water inflow;
N c : the actual measurement value of the second ammonia nitrogen on-line instrument is the difference value between the actual measurement value of the second ammonia nitrogen on-line instrument and the set value of the second ammonia nitrogen on-line instrument;
E A : the oxygen utilization rate of the aerator;
K 0 : is the oxygen demand correction coefficient;
and uniformly compensating the feedback compensation gas quantity to the first section of pool body to the fourth section of pool body in the aerobic pool by controlling the variable-frequency blasting equipment, the first electric valve, the second electric valve, the third electric valve and the fourth electric valve.
2. The aeration control method according to claim 1, wherein in the dissolved oxygen feedforward and feedback aeration control of the method, the set value of the second dissolved oxygen on-line instrument is automatically distributed and adjusted according to the change value of ammonia nitrogen according to a set adjustment period, and the set value is:
under the steady operation state of the aerobic tank, the optimal control range of dissolved oxygen is obtained according to the change value of ammonia nitrogen: Δdo=k×Δnh 3 +b, wherein Δdo: an adjustment amount for dissolved oxygen; ΔNH 3 : is the change value of ammonia nitrogen; k. b is a constant, and the values are-1 and 0.5 respectively;
setting a set value of a first ammonia nitrogen on-line instrument as a certain interval, and adjusting a matrix according to the set variable values of different ammonia nitrogen in the interval; and during automatic operation, automatically matching and adjusting the set value of the second dissolved oxygen online instrument according to the change value of ammonia nitrogen and the dissolved oxygen adjustment matrix.
3. An aeration control method according to claim 1 or 2, wherein in the dissolved oxygen feedforward and feedback aeration control of the method, the set adjustment period in the set value of the second dissolved oxygen on-line meter is automatically allocated and adjusted according to the change value of ammonia nitrogen according to the set adjustment period to be 0.5h.
4. An aeration control method according to claim 1, wherein the water intake meter employs a water intake electromagnetic flowmeter;
the first ammonia nitrogen on-line instrument and the second ammonia nitrogen on-line instrument adopt an electrode method ammonia nitrogen on-line instrument;
the first dissolved oxygen online instrument and the second dissolved oxygen online instrument are both dissolved oxygen online instruments by adopting a fluorescence method;
the first gas flowmeter, the second gas flowmeter, the third gas flowmeter and the fourth gas flowmeter are all thermal type gas mass flowmeters;
the first electric valve, the second electric valve, the third electric valve and the fourth electric valve are all electric diamond valves;
the variable frequency air blast equipment adopts air suspension variable frequency air blast equipment.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA883339B (en) * | 1987-05-18 | 1988-11-16 | Degremont | Method for regulating the air-flow in a waste water purification system |
| CN101234818A (en) * | 2008-02-22 | 2008-08-06 | 清华大学 | Urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device |
| JP2012200705A (en) * | 2011-03-28 | 2012-10-22 | Swing Corp | Nitrogen-containing wastewater treatment method and apparatus |
| CN202671310U (en) * | 2012-06-26 | 2013-01-16 | 江苏创博工程技术有限公司 | Accurate aerating system for sewage treatment |
| CN103663674A (en) * | 2013-12-18 | 2014-03-26 | 清华大学 | Real-time control device and control method for blast aeration process of sewage treatment plant |
| CN107500408A (en) * | 2017-09-04 | 2017-12-22 | 信开水环境投资有限公司 | A kind of multistage A/O techniques aeration control system fed back based on ammonia nitrogen and dissolved oxygen |
| JP2019013858A (en) * | 2017-07-03 | 2019-01-31 | 横河電機株式会社 | Control system and control method |
| CN109592804A (en) * | 2018-12-28 | 2019-04-09 | 中原环保股份有限公司 | A kind of sewage treatment approach follows excellent accurate aeration method |
| CN211283894U (en) * | 2019-07-10 | 2020-08-18 | 北京首创股份有限公司 | Aeration control system |
-
2019
- 2019-07-10 CN CN201910620544.0A patent/CN110204067B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA883339B (en) * | 1987-05-18 | 1988-11-16 | Degremont | Method for regulating the air-flow in a waste water purification system |
| CN101234818A (en) * | 2008-02-22 | 2008-08-06 | 清华大学 | Urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device |
| JP2012200705A (en) * | 2011-03-28 | 2012-10-22 | Swing Corp | Nitrogen-containing wastewater treatment method and apparatus |
| CN202671310U (en) * | 2012-06-26 | 2013-01-16 | 江苏创博工程技术有限公司 | Accurate aerating system for sewage treatment |
| CN103663674A (en) * | 2013-12-18 | 2014-03-26 | 清华大学 | Real-time control device and control method for blast aeration process of sewage treatment plant |
| JP2019013858A (en) * | 2017-07-03 | 2019-01-31 | 横河電機株式会社 | Control system and control method |
| CN107500408A (en) * | 2017-09-04 | 2017-12-22 | 信开水环境投资有限公司 | A kind of multistage A/O techniques aeration control system fed back based on ammonia nitrogen and dissolved oxygen |
| CN109592804A (en) * | 2018-12-28 | 2019-04-09 | 中原环保股份有限公司 | A kind of sewage treatment approach follows excellent accurate aeration method |
| CN211283894U (en) * | 2019-07-10 | 2020-08-18 | 北京首创股份有限公司 | Aeration control system |
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