CN106277383B - Aeration control system and method based on oxygen consumption rate tester - Google Patents

Aeration control system and method based on oxygen consumption rate tester Download PDF

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CN106277383B
CN106277383B CN201610757780.3A CN201610757780A CN106277383B CN 106277383 B CN106277383 B CN 106277383B CN 201610757780 A CN201610757780 A CN 201610757780A CN 106277383 B CN106277383 B CN 106277383B
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aeration
oxygen
dissolved oxygen
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consumption rate
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CN106277383A (en
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罗涛
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Shangchuan Beijing Equipment Co ltd
Shine Beijing Water Co ltd
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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
    • 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
    • C02F3/12—Activated sludge processes
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • 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
    • 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
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    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Abstract

The invention discloses an aeration control system, which comprises: the device comprises a data acquisition unit, a PLC control unit and an aeration unit, wherein the data acquisition unit comprises an OUR tester and a DO tester, and the aeration unit comprises an air blower, a microporous aeration head and a flowmeter. The application also provides a method for controlling aeration by using the aeration control system, the automatic control software of the system combines the OUR value and the DO value automatically collected by an online tester through inputting an automatic control algorithm, and calculates the aeration quantity required to be supplied according to the variable OTE value calculated by the OUR and the aeration quantity, and then changes the blast flow by outputting signals, thereby ensuring that the DO is stabilized at a set value, the deviation is not more than 0.5mg/L, realizing the dynamic balance of oxygen supply and demand, not only avoiding the problem of poor water quality caused by insufficient oxygen supply, but also reducing the energy waste caused by excessive aeration, and simultaneously having the function of evaluating the performance of the aeration system.

Description

Aeration control system and method based on oxygen consumption rate tester
Technical Field
The invention relates to the field of sewage treatment, in particular to an aeration control system and an aeration control method based on an oxygen consumption rate tester.
Background
In the industrial development and energy utilization of China at the present stage, energy conservation and emission reduction are still important subjects. Currently, the current practice is. The energy efficiency of urban sewage treatment in China is still at a low stage, and the high energy consumption per ton of water is still high; as is well known, the sewage treatment industry is a high-energy-consumption industry, the total power consumption of the sewage treatment industry in 2012 in China is up to 125 hundred million kWh, and the unit power consumption is 0.29kWh/m3If the price of the electric charge is 0.7 yuan/kWh, the total electric charge is nearly 90 million yuan, and at present, a large part of sewage plants in China have no sludge treatment facilities. Along with the implementation of upgrading and reconstruction in various regions, the energy consumption of sewage treatment in China is further increased. Therefore, energy conservation and consumption reduction are important tasks of the operation management of the sewage treatment plant in China at present.
The aeration system is an important part in the sewage biological treatment process, is mainly used for supplying oxygen to an oxygen consumption tank, and is also the most important energy consumption link. Generally, the total power consumption of the sewage plant is about 50% -70%, so that the energy consumption in the aeration stage is reduced, which is the important factor for saving energy and reducing consumption of the sewage plant. The aeration control strategy is to realize automatic and accurate regulation and control of aeration quantity in the sewage treatment process by adopting an automatic control instrument and instrument so as to achieve the purposes of stable effluent quality reaching the standard, energy conservation, consumption reduction and personnel intervention reduction.
At present, the most common domestic aeration control method is a relatively extensive manual debugging mode, aeration quantity is usually determined according to the experience of operators, and if the effluent quality does not fluctuate obviously for a long time, the aeration quantity cannot be adjusted in real time; once the operation condition is changed, the adjustment of the aeration amount is still only adjusted according to the experience, so that the problems of insufficient aeration or excessive aeration are caused, even the aeration system of some treatment plants is operated for a long time in a state of exceeding the normal load, the quality of effluent water is not ensured, and a large amount of energy consumption waste is caused. Most control strategies do not relate to the mass transfer efficiency of oxygen, and the relationship between the aeration rate and the conversion rate cannot be accurately grasped, so that the control of the aeration rate is inaccurate.
The DO (dissolved oxygen) control method is that when the feedback DO value is larger than the set value, the opening of the valve is reduced, and the blast volume is reduced; if the fed-back DO value is smaller than the set value, the air quantity is increased to increase the DO value, which causes a problem that the data fluctuation is large. For a system which carries out aeration control by using ORP (oxidation-reduction potential) and pH, because the ORP and the pH have no direct linear relation with aeration quantity, and the ORP value is delayed seriously in a short period, accurate judgment is difficult in the nitrification-denitrification process, and the system is not wide in practical application. The water quality index is used as feedforward aeration control, the basic principle is to calculate the oxygen amount required to be provided through the pollutant concentration, but the sewage quality index is mostly determined by experiments, the determination time needs hours or even days, and the effect on real-time control is not great. The on-line water quality detecting instrument has delay of hours, and is expensive and not completely popularized.
And intermittent type formula aeration is through opening repeatedly opening and shutting down the air-blower, makes the oxygen consumption pond be in aeration and the alternative state of not aeration, simple and practical, but control performance is unstable, and the air-blower is generally in the maximum load, and the energy consumption is high, and can reduce the fan life-span. Therefore, it is desirable to provide a precise and reliable aeration control method.
Disclosure of Invention
The invention aims to provide an aeration control system and method, which can realize accurate aeration and achieve the purposes of energy conservation and consumption reduction.
In view of the above, the present application provides an aeration control system, comprising: the system comprises a data acquisition unit, a PLC (programmable logic controller) control unit and an aeration unit, wherein the data acquisition unit comprises an oxygen consumption rate tester and a dissolved oxygen tester, and the aeration unit comprises a blower, a microporous aeration head and a flowmeter;
the detection part of the oxygen consumption rate measuring instrument extends into the aeration tank, and the oxygen consumption rate measuring instrument is in signal connection with the PLC control unit;
the detection part of the dissolved oxygen tester extends into the aeration tank, and the dissolved oxygen tester is in signal connection with the PLC control unit;
the microporous aeration head is arranged in the aeration tank, an inlet of the microporous aeration head is communicated with the air blower, the flow meter is arranged on a pipeline between the microporous aeration head and the air blower, and the flow meter and the air blower are both connected with the PLC control unit.
Preferably, the aeration control system further comprises a stirring device, and one end of the stirring device is arranged in the aeration tank.
Preferably, the PLC control unit includes a data acquisition terminal, a data display window, and system automatic control software.
The application also provides a method for controlling aeration by using the aeration control system, which comprises the following steps:
setting a dissolved oxygen set value in the PLC control unit;
obtaining the aeration quantity required by a dissolved oxygen set value according to the detected sludge oxygen consumption rate, the actual dissolved oxygen concentration and the calculated oxygen transfer efficiency; the oxygen transfer efficiency is calculated by a PLC control unit according to the sludge oxygen consumption rate;
and adjusting the air blower according to the aeration amount to control the aeration amount in the aeration tank.
Preferably, the sludge oxygen consumption rate is measured on line by an oxygen consumption rate measuring instrument, and the period of the on-line measurement is 15 min.
Preferably, the actual dissolved oxygen concentration is monitored in real time by a dissolved oxygen monitor, and the oxygen transfer rate is calculated by OUR and the last aeration amount.
Preferably, the calculation formula of the aeration amount required for obtaining the dissolved oxygen set value is:
Figure GDA0002253779940000031
wherein Q is the required aeration quantity, OUR is the oxygen consumption rate of the activated sludge, VAeration tankIs the volume of the aeration tank, tControl periodThe time required for determining a value for the OUR instrument, CSet valueTo control the target dissolved oxygen concentration to be achieved after the reaction, CActual valueDetermining the dissolved oxygen concentration for the actual dissolved oxygen probe;
SOTR is the fresh water oxygenation capacity of the aerator under the quantity of Q gas and is saturated dissolved oxygen under the standard state, k is a correction parameter of the saturated dissolved oxygen, SOTE is the oxygen utilization rate of the aerator under the standard state,
Figure GDA0002253779940000032
is the saturated dissolved oxygen concentration under standard conditions.
Preferably, the controlling the aeration amount in the aeration tank specifically comprises:
when the actual dissolved oxygen value is not equal to the set value, the PLC recalculates the air volume according to the sludge oxygen consumption rate and the oxygen transfer efficiency, and adjusts the fan or increases the aeration rate or decreases the aeration rate to ensure that the actual dissolved oxygen slightly fluctuates above and below the set value;
when the actual dissolved oxygen value variation trend fluctuates around the set value and the fluctuation is less than +/-0.5 mg/L, the stable control of aeration is realized.
The invention provides an aeration control system, which comprises: the system comprises a data acquisition unit, a PLC control unit and an aeration unit, wherein the data acquisition unit comprises an oxygen consumption rate (OUR) tester and a Dissolved Oxygen (DO) tester, and the aeration unit comprises an air blower, a micropore aeration head and a flowmeter. The aeration control system provided by the application is based on oxygen consumption rate (OUR) as a control parameter, the control system provides accurate basis for the amount of oxygen which should be supplied by the aeration system by measuring the real-time oxygen consumption rate of the activated sludge in the aeration tank, and the aeration amount which needs to be supplied actually is calculated by measuring the oxygen consumption rate and the actual dissolved oxygen concentration; according to the method, the OUR value and the DO value which are automatically acquired on line are fed back to the PLC, the required aeration quantity is calculated through a control algorithm, the aeration quantity of the fan is changed through output signals, accurate aeration is achieved, and the purposes of energy conservation and consumption reduction are achieved.
Drawings
FIG. 1 is a schematic view of the structure of an aeration control system according to the present invention;
FIG. 2 is a flow chart of an embodiment of the aeration control method of the present invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The embodiment of the invention discloses an aeration control system, which comprises: the system comprises a data acquisition unit, a PLC control unit and an aeration unit, wherein the data acquisition unit comprises an oxygen consumption rate tester and a dissolved oxygen tester; the PLC control unit comprises hardware equipment such as a control cabinet and a display screen and software equipment such as a written control program; the aeration unit comprises a blower, a microporous aeration head and a flowmeter;
a breathing pipe of the oxygen consumption rate tester extends into the aeration tank, and the oxygen consumption rate tester is in signal connection with the PLC control unit;
a probe of the dissolved oxygen tester is immersed in the aeration tank, and the dissolved oxygen tester is in signal connection with the PLC control unit;
the aeration tank is characterized in that the micropore aeration head is arranged at the bottom of the aeration tank, a ventilation pipeline of the micropore aeration head is communicated with the air blower, the flow meter is arranged on a pipeline between the micropore aeration head and the air blower, and the flow meter and the air blower are connected with the PLC control unit.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an aeration control system of the present invention, in which fig. 1 is an aeration tank, 2 is a Dissolved Oxygen (DO) real-time monitor, 3 is a sludge oxygen consumption rate (OUR) meter, 4 is a stirring device, 5 is a programmable logic control unit (PLC), 6 is an aeration pipeline, 7 is a data signal transmission line, 8 is a blower, 9 is a flow meter, and 10 is a microporous aeration head.
In order to make the oxygen distribution in the aeration tank uniform, the aeration control system further comprises a stirring device 4, and one end of the stirring device 4 is arranged in the aeration tank. Microporous aeration head 10 increases the specific surface area of the air bubbles, thereby increasing the transfer efficiency of oxygen.
The aeration tank, the sludge oxygen consumption rate determinator, the stirring device, the dissolved oxygen real-time monitor, the flow meter, the aeration pipeline, the blower, the data signal transmission line and the microporous aeration head are all devices well known to those skilled in the art, and the sources of the devices are not particularly limited in the present application. The OUR determinator is used for detecting the oxygen consumption rate of activated sludge in an aeration tank, and the DO determinator is used for monitoring the dissolved oxygen amount of the aeration tank in real time.
The PLC control system is a control system known to those skilled in the art, and includes a data acquisition end, a data display window, and system automatic control software.
The OUR tester and the DO tester respectively test the OUR value and the DO value in the aeration tank; wherein the oxygen consumption rate (OUR) refers to the speed of oxygen consumed by microorganisms in the sludge during respiration by utilizing organic matters, is an important index for representing the activity of the microorganisms in the sludge and represents the actual oxygen demand.
According to the aeration control system, the aeration quantity to be supplied is automatically calculated according to a formula through the PLC control unit according to the OUR value and the DO value which are automatically collected on line, and then the signal output is changed to change the blast flow, so that the accuracy of aeration control is ensured. Therefore, the application also provides a method for controlling aeration by using the aeration control system, which comprises the following steps:
setting a dissolved oxygen set value in the PLC control unit;
obtaining the aeration quantity required by a dissolved oxygen set value according to the detected sludge oxygen consumption rate, the actual dissolved oxygen concentration and the oxygen transfer efficiency; the oxygen transfer efficiency is calculated by a PLC control unit according to the sludge oxygen consumption rate;
and adjusting the air blower according to the aeration amount to control the aeration amount in the aeration tank.
The process comprises the following steps:
inputting a dissolved oxygen set value into the PLC control unit;
according to the detected sludge oxygen consumption rate and the actual dissolved oxygen concentration, calculating by a PLC control unit to obtain the actual instantaneous oxygen supply amount, and according to the actual aeration parameter and the oxygen transfer efficiency, calculating by the PLC control unit to obtain the performance evaluation parameter of the aeration system; the oxygen transfer efficiency is calculated by a PLC control unit according to the sludge oxygen consumption rate;
calculating by a PLC (programmable logic controller) control unit according to the actual instantaneous oxygen supply amount, the dissolved oxygen set value and the performance evaluation parameter of the aeration system to obtain the aeration amount required by the dissolved oxygen set value;
and adjusting the air blower according to the aeration amount to control the aeration amount in the aeration tank.
The process of utilizing the aeration control system to carry out aeration control comprises the following steps: inputting an expected DO value and an initial aeration amount into software in the PLC control unit; measuring an oxygen consumption rate (OUR) value according to an OUR measuring instrument; calculating an Oxygen Transfer Efficiency (OTE) value according to the relation between oxygen transfer rate (OTE) and OUR and other parameters; calculating the required actual aeration amount according to a relation function formula of the actual aeration amount and other parameters; and adjusting the fan according to the aeration quantity. The above process is shown in detail in fig. 2.
In the process, the sludge oxygen consumption rate is measured by an active sludge oxygen consumption rate on-line measuring device, and the time interval of the measuring device is 15 min; and the actual dissolved oxygen concentration is detected by a dissolved oxygen real-time monitor.
The performance evaluation parameters of the aeration system are important indexes of the comprehensive oxygenation performance of aeration in a process state and are obtained by an online measuring device and actual aeration parameters, wherein the actual aeration parameters comprise the oxygenation capacity of clear water of an aerator, correction parameters based on basic conditions of water quality, saturated dissolved oxygen concentration in a standard state and saturated dissolved oxygen concentration under different temperature conditions; the actual aeration rate is measured by a flowmeter.
The calculation process is obtained through PLC control.
The control rule of the aeration amount implanted by the PLC control unit is as follows:
Figure GDA0002253779940000061
wherein Q is the required aeration quantity, OUR is the oxygen consumption rate of the activated sludge, VAeration tankThe volume of the aeration tank is adopted, the t control period is the OUR instrument measuring period, CSet valueTo adjust the target value to be achieved, CActual valueThe measured value is the actual measured value of the dissolved oxygen probe, SOTR is the aeration capacity of the clear water of the aerator under the quantity of Q gas, the oxygen is saturated dissolved oxygen under the standard state, and k is a correction parameter of the saturated dissolved oxygen; among the above parameters, VAeration tank、CSet value、tControl periodSOTR, k are preset parameters, OUR and CActual valueOTE is the calculated value for instrumental measurements.
k varies with the change of the test conditions such as water quality and pressure, but k can be determined as a fixed value by default after the measurement of saturated dissolved oxygen in sewage and the measurement of the atmospheric pressure on site are carried out. In the calculation of the aeration amount, Q1 is the last calculation value of the actually measured aeration amount.
The specific derivation process of the aeration amount control rule is as follows:
firstly, calculating the actual instantaneous oxygen supply amount according to the following formula:
Figure GDA0002253779940000071
wherein OUR is the oxygen consumption rate of the activated sludge, VAeration tankIs the volume of the aeration tank, C is the dissolved oxygen concentration, tControl periodDetermination of the period, C, for the OUR InstrumentSet valueTo adjust the target value to be achieved, CActual valueIs the actual measured value of the dissolved oxygen probe; among the above parameters, VAeration tank、CSet value、tControl periodFor the preset parameters, OUR and CActual valueIs an instrumental measurement value; the oxygen supply amount can be calculated according to the calculation formula and the measured value of the instrument.
And then, calculating the performance evaluation parameters of the aeration system, wherein the calculation formula is as follows:
Figure GDA0002253779940000072
wherein Q is the required aeration quantity, SOTR is the pure water oxygenation capacity of the aerator under the quantity of Q, and is saturated dissolved oxygen under a standard state, and k is a correction parameter of the saturated dissolved oxygen; theta is a temperature correction parameter of the oxygen transfer efficiency; among the above parameters, CActual valueSOTR, k and theta are set values for the measured value of the instrument, wherein: theta is 0.888.
The SOTR changes along with the change of aeration quantity, the k changes along with the change of water quality, the temperature and the position of a test site, and therefore the parameter k is a variable. In contrast, SOTR can be obtained from specification of performance index of aerator products used in sewage treatment plants, and k can be determined by first determining saturated dissolved oxygen in sewage and by measuring atmospheric pressure on site, and then defaulted to a fixed value. In the process of calculating the performance evaluation parameters of the aeration system, Q is the required aeration quantity, and specifically comprises the following steps: if the aeration system is started for the first time, Q is the set aeration quantity, if the aeration system is operated for a period of time, Q is the aeration quantity calculated last time, and in the process, in order to distinguish the last aeration quantity from the actual aeration quantity, the last calculation value of the actually measured aeration quantity is set as Q1.
In the above formula, the OTE is calculated by its relationship with other parameters, and the Oxygen Transfer Efficiency (OTE) is performed according to the following rule:
Figure GDA0002253779940000081
wherein OT is the consumption of oxygen in the aeration tank, OS is the air supply, OUR is the oxygen consumption rate of the activated sludge, VAeration tankQ1 is the actual measured aeration rate for the aeration tank volumeThe last operation value of (a).
Substituting the OTE calculation formula into the formula of the aeration system performance evaluation parameter to obtain the aeration system performance evaluation parameter.
And finally, calculating the aeration rate according to the following rules:
Figure GDA0002253779940000082
wherein SOTE is the oxygen utilization rate of the aerator in a standard state.
Brought above AORGeneral assemblyAnd α F, the calculation formula for obtaining the actually required aeration quantity Q is as follows:
Figure GDA0002253779940000083
the Oxygen Transfer Efficiency (OTE) calculation formula is as follows:
Figure GDA0002253779940000084
wherein OT is the consumption of oxygen in the aeration tank, OS is the air supply, OUR is the oxygen consumption rate of the activated sludge, VAeration tankQ1 is the last calculation value of the aeration amount actually measured for the aeration tank volume.
Substituting the OTE calculation formula into an aeration quantity formula to obtain the following formula of actually required aeration quantity Q:
Figure GDA0002253779940000085
the aeration control method utilizes the aeration control system to carry out real-time monitoring and calculation on aeration quantity, in the actual aeration control process, the aeration quantity changes along with the change of an on-line monitoring value and the parameters in real time, the calculation formula of the Q is directly input into the PLC control unit, and the PLC control unit directly outputs the value according to the measured OUR value and DO value to control the aeration unit. The invention provides an aeration control system based on an oxygen consumption rate OUR as a control parameter, which comprises the steps of firstly setting an expected Dissolved Oxygen (DO) concentration, measuring an actual dissolved oxygen value through a dissolved oxygen measuring instrument, measuring an OUR value through the oxygen consumption rate (OUR) instrument, calculating an OTE value, and realizing the air volume control of an air blower by utilizing the OUR, the OTE and a difference value between the calculated dissolved oxygen value and the expected concentration of the actual dissolved oxygen concentration through a PLC (programmable logic controller); meanwhile, the OTE value is calculated by utilizing the relation between other parameters and the OTE value, and an OTE determinator is not arranged, so that equipment of a control system is simplified, and the accurate control of the aeration amount is still realized. The aeration control system of the invention can accurately monitor the sludge activity and the actual dissolved oxygen in the aeration tank and calculate the Oxygen Transfer Efficiency (OTE) under different working conditions, thereby simplifying the control process, realizing the accurate control of the aeration quantity and achieving the purposes of long-term stable effluent quality, energy conservation and consumption reduction.
For further understanding of the present invention, the aeration control system and the aeration control method provided by the present invention are described in detail below with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Example 1
Setting a desired dissolved oxygen concentration, wherein the set dissolved oxygen value is that the actual aeration quantity is close to or consistent with the desired value as much as possible by changing the aeration quantity;
firstly, writing a control algorithm program into the PLC control unit 5, after the aeration control system starts to operate, the DO concentration in sewage is measured in real time by the Dissolved Oxygen (DO) measuring instrument 2, the DO is sent to the PLC control unit 5 through the data signal transmission line 7, the OUR measuring instrument 3 can feed back data to the PLC control unit 5, the flowmeter 9 sends an air volume signal to the PLC control unit 5 through the data signal transmission line 7 in real time, the PLC control unit calculates the required aeration volume through algorithm integration, the calculation result is sent to the control blower 8 in a signal mode, and the air volume is output to the aeration tank 1 through the air channel pipeline.
Specifically, the OUR tester 3 comprises the specific working steps of sucking 1L of the tested mixed solution, aerating to ensure that the DO concentration reaches 6-8 mg/L, pumping the mixed solution into a respiratory chamber, automatically making a DO curve changing along with time by a software program, and obtaining the slope k of the DO curve to obtain the OUR value of active microorganisms in the active sludge; the sampling time interval of the OUR measuring instrument 3 is 15min, each time the OUR measuring instrument 3 measures one OUR value until the next measured value is fed back, the PLC control unit 5 calculates the required aeration amount according to the OUR value, the measured value of the DO measuring instrument 2 and the OTE calculated value;
the OTE calculation formula is input into a PLC control unit 5;
the PLC control unit 5 comprises a data collection module, a command sending module, a data display screen and a historical data module, and the quality of the aeration control system is judged by observing the deviation degree of the change trend of the actual dissolved oxygen value and the dissolved oxygen set value.
Example 2
The volume of the aeration tank is 0.25m3Since the measurement cycle of the OUR measuring instrument is 15min, the control cycle is set to 15min, SOTE is 20%, SOTR is 0.03kg/h, k is 0.75, and C* ∞20Is a saturated dissolved oxygen value at 20 ℃;
the initial setting value of dissolved oxygen is 2, aeration control can be implemented after the OUR measuring instrument, the DO measuring instrument and the aeration system are all connected into the PLC, the OUR measuring instrument measures a value every 15min, the DO measuring instrument measures in real time, each change of the OUR and the DO is transmitted to the PLC control cabinet through a signal transmission line, actually required air volume is calculated, a command is transmitted to the flow control valve to reach a command value by changing the opening degree of the flow control valve, and the numerical value of the actual air volume is displayed on a signal screen through a signal line.
Because the OUR and OTE values are not changed greatly under the stable condition, the control quality of the dissolved oxygen is stabilized within the range of +/-0.5 mg/L;
if the OUR value is increased or decreased by a large amount, the PLC will transmit the calculated value to the flow controller to command it to make aeration adjustments so that the actual dissolved oxygen quickly returns to a level of 2.
1. When OUR is 30 mg/L.h, DOSet valueWhen the concentration is 2mg/L, the amount of dissolved oxygen DO is substantially equal toActual value2mg/L, then Q is 8.63L/min;
2. when OUR is 30 mg/L.h, DOSet valueIncreased to 2.5mg/LWhen the Q is 8.06L/min;
3. when the OUR rises to 35 mg/L.h, DOActual valueAnd 2.5mg/L, Q is 8.14L/min.
From 1 to 2, because the actual dissolved oxygen exceeds the set value 2 at the moment, the aeration rate is correspondingly reduced, so that the actual dissolved oxygen gradually falls back to be closer to the set value; from 1 to 3, OUR and DO values are increased, but DO isActual valueIf the deviation from the set value is too large, the OUR increase amount cannot be enough to quickly reduce the dissolved oxygen amount, so that the actual dissolved oxygen value can quickly return to the set value by reducing the air volume; from 2 to 3, it can be seen that an increase in OUR indicates that increased sludge activity requires increased aeration to meet its normal survival.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. The method for controlling aeration by utilizing the aeration control system comprises the following steps:
the aeration control system comprises: the system comprises a data acquisition unit, a PLC (programmable logic controller) control unit and an aeration unit, wherein the data acquisition unit comprises an oxygen consumption rate tester and a dissolved oxygen tester, and the aeration unit comprises a blower, a microporous aeration head and a flowmeter;
the detection part of the oxygen consumption rate measuring instrument extends into the aeration tank, and the oxygen consumption rate measuring instrument is in signal connection with the PLC control unit;
the detection part of the dissolved oxygen tester extends into the aeration tank, and the dissolved oxygen tester is in signal connection with the PLC control unit;
the microporous aeration head is arranged in an aeration tank, the inlet of the microporous aeration head is communicated with the blower, the flow meter is arranged on a pipeline between the microporous aeration head and the blower, and the flow meter and the blower are both connected with a PLC control unit;
setting a dissolved oxygen set value in the PLC control unit;
obtaining the aeration quantity required by a dissolved oxygen set value according to the detected sludge oxygen consumption rate, the actual dissolved oxygen concentration and the calculated oxygen transfer efficiency; the oxygen transfer efficiency is calculated by a PLC control unit according to the sludge oxygen consumption rate;
adjusting the blower according to the required aeration amount, and controlling the aeration amount in the aeration tank;
the calculation formula of the aeration amount required by the dissolved oxygen set value is as follows:
Figure 279374DEST_PATH_IMAGE002
wherein Q is the required aeration quantity, OUR is the oxygen consumption rate of the activated sludge, VAeration tankIs the volume of the aeration tank, tControl periodThe time required for determining a value for the OUR instrument, CSet valueTo control the target dissolved oxygen concentration to be achieved after the reaction, CActual valueDetermining the dissolved oxygen concentration for the actual dissolved oxygen probe;
SOTR is the fresh water oxygenation capacity of the aerator under the quantity of Q gas, k is a correction parameter of saturated dissolved oxygen, SOTE is the oxygen utilization rate of the aerator under a standard state,
Figure 288918DEST_PATH_IMAGE004
is the saturated dissolved oxygen concentration under the standard condition;
the sludge oxygen consumption rate is obtained by online measurement of an oxygen consumption rate measuring instrument, and the period of the online measurement is 15 min;
oxygen Transfer Efficiency (OTE) is performed according to the following rule:
Figure 729127DEST_PATH_IMAGE006
wherein OT is the consumption of oxygen in the aeration tank, OS is the air supply, OUR is the oxygen consumption rate of the activated sludge, VAeration tankQ1 is the last calculation value of the aeration amount actually measured for the aeration tank volume.
2. The method of claim 1, wherein the aeration control system further comprises a stirring device, one end of which is disposed in the aeration tank.
3. The method of claim 1, wherein the PLC control unit comprises a data acquisition terminal, a data display window, and system automation software.
4. The method according to claim 1, wherein the controlling of the amount of aeration in the aeration tank is specifically:
when the actual dissolved oxygen value is not equal to the set value, the PLC recalculates the air volume according to the sludge oxygen consumption rate and the oxygen transfer efficiency, and adjusts the fan or increases the aeration rate or decreases the aeration rate to ensure that the actual dissolved oxygen slightly fluctuates above and below the set value;
when the actual dissolved oxygen value variation trend fluctuates around the set value and the fluctuation is less than +/-0.5 mg/L, the stable control of aeration is realized.
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CN109019905B (en) * 2018-10-18 2021-08-03 河南倍杰特环保技术有限公司 Water treatment system based on aeration control
CN110104777B (en) * 2019-06-10 2022-05-20 江苏复星节能环保有限公司 DO intelligent control method for sewage plant
CN112487603B (en) * 2020-10-09 2022-06-14 同济大学 Blast aeration system oxygenation capacity change determination method and system based on big data
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CN114488822B (en) * 2022-04-12 2022-07-05 江苏省现代企业信息化应用支撑软件工程技术研发中心 Intelligent sewage treatment process optimization method based on high-dimensional multi-objective evolutionary algorithm
CN115132285B (en) * 2022-07-04 2024-06-25 山东臻智行环保科技有限公司 Model method for realizing real-time prediction of aeration quantity required by sewage treatment aerobic tank
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