CN114249415B - Accurate aeration device and method - Google Patents

Accurate aeration device and method Download PDF

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Publication number
CN114249415B
CN114249415B CN202111578040.0A CN202111578040A CN114249415B CN 114249415 B CN114249415 B CN 114249415B CN 202111578040 A CN202111578040 A CN 202111578040A CN 114249415 B CN114249415 B CN 114249415B
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value
dissolved oxygen
oxygen concentration
aeration
aeration tank
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CN114249415A (en
Inventor
王佳伟
袁星
李烨
孟晓宇
焦二龙
樊鹏超
蒋奇海
孙冀垆
张达飞
刘垚
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Beijing Drainage Group Co Ltd
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Beijing Drainage Group 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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • 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
    • 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
    • C02F2209/03—Pressure
    • 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
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • 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

Abstract

The invention discloses an accurate aeration device, which comprises: the biological treatment device comprises a plurality of biological tanks, wherein each biological tank comprises at least one aeration tank, the water inlet end of each biological tank is provided with a first electric regulating valve, and the water outlet end of each biological tank is provided with an ammonia nitrogen concentration detector; the main water inlet pipe is connected with the biological tanks and is provided with a water inlet flowmeter; the on-line dissolved oxygen meters are respectively arranged in the aeration tanks; the air blower is connected with the aeration tanks through a plurality of air pipes, each air pipe is provided with a second electric regulating valve and a gas flowmeter, and the air outlet of the air blower is provided with a pressure transmitter; the controller is connected with the first electric regulating valve, the ammonia nitrogen concentration detector, the water inlet flowmeter, the online dissolved oxygen meter, the blower, the second electric regulating valve, the gas flowmeter and the pressure transmitter; can simultaneously carry out accurate adjustment to the water inflow, the air blower pressure and the aeration quantity, and keep the stability of the concentration of the dissolved oxygen in the biological pond.

Description

Accurate aeration device and method
Technical Field
The invention belongs to the technical field of aeration, and particularly relates to an accurate aeration device and method.
Background
Along with the continuous improvement of the water quality requirement of the effluent of the sewage treatment plant, the standard improvement of the water plant is urgent, wherein the control of dissolved oxygen influences the denitrification and dephosphorization effects of the biological denitrification and dephosphorization process. The control of dissolved oxygen has a direct relation with the water inlet load, the air supply valve adjustment and the running condition of the air blower, and how to treat the relation among the load balance, the pressure adjustment and the dissolved oxygen control of a single biological pond directly influences the running effect of the aeration system. At present, the existing aeration device is difficult to realize accurate control of aeration.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the precise aeration device and the precise aeration method, and the device can monitor a first electric regulating valve, an ammonia nitrogen concentration detector, a water inlet flowmeter, an online dissolved oxygen meter, a blower, a second electric regulating valve, a gas flowmeter and a pressure transmitter, and can precisely regulate the water inlet amount, the blower pressure and the aeration amount at the same time, so as to keep the concentration of the dissolved oxygen in the biological tank stable.
In order to achieve the above object, the present invention provides an accurate aeration apparatus comprising:
the biological treatment device comprises a plurality of biological tanks, wherein each biological tank comprises at least one aeration tank, a water inlet end of each biological tank is provided with a first electric regulating valve, and a water outlet end of each biological tank is provided with an ammonia nitrogen concentration detector;
the total water inlet pipe is connected with a plurality of biological tanks, and a water inlet flowmeter is arranged on the total water inlet pipe;
the on-line dissolved oxygen meters are respectively arranged in the aeration tanks;
the air blower is connected with the aeration tanks through a plurality of air pipes, a second electric regulating valve and a gas flowmeter are arranged on each air pipe, and a pressure transmitter is arranged on an air outlet of the air blower;
and the controller is connected with the first electric regulating valve, the ammonia nitrogen concentration detector, the water inlet flowmeter, the online dissolved oxygen meter, the blower, the second electric regulating valve, the gas flowmeter and the pressure transmitter.
Optionally, a water distribution channel is arranged at the upstream of the biological pond, and the total water inlet pipe is connected to the water distribution channel.
Optionally, each of the biological tanks further comprises at least one non-aerated tank.
Optionally, the controller includes a blower control unit for controlling inlet and outlet guide vane opening of the blower.
The invention also provides a precise aeration method based on the precise aeration device, which comprises the following steps:
setting an aeration tank dissolved oxygen concentration average value set value, an initial blower pressure value, a second electric regulating valve opening average value set value and an effluent ammonia nitrogen concentration set value;
respectively obtaining the average value of dissolved oxygen concentration of aeration tanks in different biological tanks, and adjusting the opening of a first electric adjusting valve according to the average value of dissolved oxygen concentration and a set value of the average value of dissolved oxygen concentration of the aeration tanks;
acquiring a second electric regulating valve opening mean value, and regulating the initial blower pressure value according to the dissolved oxygen concentration mean value, the second electric regulating valve opening mean value, the aeration tank dissolved oxygen concentration mean value set value and the second electric regulating valve opening mean value set value to acquire a blower pressure correction value;
obtaining an actual value of the ammonia nitrogen concentration of the effluent, and adjusting a mean value set value of the dissolved oxygen concentration of the aeration tank according to the actual value of the ammonia nitrogen concentration of the effluent and the set value of the ammonia nitrogen concentration of the effluent to obtain a corrected value of the dissolved oxygen concentration of the aeration tank;
and adjusting the opening of the second electric adjusting valve according to the corrected value of the dissolved oxygen concentration of the aeration tank and the actual value of the dissolved oxygen concentration of the aeration tank in different biological tanks.
Optionally, the separately obtaining the average value of the dissolved oxygen concentration of the aeration tank in the different biological tanks comprises:
respectively obtaining the average value of dissolved oxygen concentration of aeration tanks in different biological tanks in a set time period before a preset time point;
the aeration tank is an aeration tank close to the water outlet end of the biological tank.
Optionally, a plurality of preset time points are provided, and a set value of the average value of the dissolved oxygen concentration of the aeration tank, an initial blower pressure value, a set value of the average value of the opening of the second electric regulating valve and a set value of the ammonia nitrogen concentration of the effluent are set at each preset time point.
Optionally, the adjusting the opening of the first electric adjusting valve according to the dissolved oxygen concentration average value and the aeration tank dissolved oxygen concentration average value set value includes:
calculating a first difference value between the dissolved oxygen concentration average value and a set value of the dissolved oxygen concentration average value of the aeration tank;
and comparing the first difference value with a first threshold value, and adjusting the opening degree of the first electric adjusting valve until the first difference value is in the first threshold value range when the first difference value is not in the first threshold value range.
Optionally, the step of adjusting the initial blower pressure value according to the dissolved oxygen concentration average value, the second electric adjusting valve opening average value, the aeration tank dissolved oxygen concentration average value set value and the second electric adjusting valve opening average value set value to obtain a blower pressure correction value includes:
calculating a second difference value between the set value of the dissolved oxygen concentration average value of the aeration tank and the average value of the dissolved oxygen concentration;
calculating a third difference value between the opening mean value set value of the second electric regulating valve and the opening mean value of the second electric regulating valve;
comparing the second difference value with a second threshold value, comparing the third difference value with a third threshold value, and taking the sum of the initial blower pressure value and a set pressure increase value as the blower pressure correction value when the second difference value is greater than the upper limit of the second threshold value and the third difference value is less than the lower limit of the third threshold value;
and when the second difference value is smaller than the lower limit of the second threshold value and the third difference value is larger than the upper limit of the third threshold value, taking the difference value between the initial blower pressure value and the set pressure reduction value as the blower pressure correction value.
Optionally, the adjusting the aeration tank dissolved oxygen concentration average value set value according to the effluent ammonia nitrogen concentration actual value and the effluent ammonia nitrogen concentration set value to obtain the aeration tank dissolved oxygen concentration correction value includes:
calculating a fourth difference value between the actual value of the ammonia nitrogen concentration of the effluent and the set value of the ammonia nitrogen concentration of the effluent;
comparing the fourth difference value with a fourth threshold value, and when the fourth difference value is within the fourth threshold value, maintaining the mean value set value of the dissolved oxygen concentration of the aeration tank;
when the fourth difference value is larger than the upper limit of the fourth threshold value, taking the sum of the set value of the mean value of the dissolved oxygen concentration of the aeration tank and the set value of the increase of the dissolved oxygen concentration as the corrected value of the dissolved oxygen concentration of the aeration tank;
when the fourth difference value is smaller than the lower limit of the fourth threshold value, taking the difference value between the mean value set value of the dissolved oxygen concentration of the aeration tank and the set reduction value of the dissolved oxygen concentration as the dissolved oxygen concentration correction value of the aeration tank;
the opening degree adjusting of the second electric adjusting valve according to the corrected value of the dissolved oxygen concentration of the aeration tank and the actual value of the dissolved oxygen concentration of the aeration tank in different biological tanks comprises:
respectively calculating the difference value between the actual dissolved oxygen concentration value of the aeration tank in different biological tanks and the dissolved oxygen concentration correction value of the aeration tank;
calculating the required aeration quantity of the aeration tanks in different biological tanks through a PID algorithm according to the difference value between the actual dissolved oxygen concentration value of the aeration tank in different biological tanks and the dissolved oxygen concentration correction value of the aeration tank;
calculating a fifth difference value between the actual air inflow of the aeration tank in the different biological tanks and the required aeration amount of the aeration tank in the different biological tanks;
and comparing the fifth difference value with a fifth threshold value, and adjusting the opening degree of the second electric adjusting valve until the fifth difference value is in the fifth threshold value range when the fifth difference value is not in the fifth threshold value range.
The invention provides a precise aeration device and a precise aeration method, which have the beneficial effects that:
1. the device can monitor the first electric regulating valve, the ammonia nitrogen concentration detector, the water inlet flowmeter, the online dissolved oxygen meter, the blower, the second electric regulating valve, the gas flowmeter and the pressure transmitter, and can accurately regulate the water inlet amount, the blower pressure and the aeration amount at the same time, so as to keep the concentration of the dissolved oxygen in the biological pond stable;
2. the method simultaneously maintains the stability of the concentration of the dissolved oxygen in the biological pond from three aspects of adjustment, and the first aspect is to adjust the total water inflow according to the average value of the concentration of the dissolved oxygen and the set value of the average value of the concentration of the dissolved oxygen in the aeration pond; the second aspect is that the initial blower pressure value is corrected according to the dissolved oxygen concentration mean value, the opening mean value of the second electric regulating valve, the dissolved oxygen concentration mean value set value of the aeration tank and the opening mean value set value of the second electric regulating valve to obtain a blower pressure correction value; the third aspect is that firstly, the aeration tank dissolved oxygen concentration correction value is obtained by correcting the aeration tank dissolved oxygen concentration average value set value according to the effluent ammonia nitrogen concentration actual value and the effluent ammonia nitrogen concentration set value, and then the aeration quantity of the aeration tank is regulated according to the aeration tank dissolved oxygen concentration correction value and the dissolved oxygen concentration average value; through the common regulation of the three aspects, the precise aeration is realized, and the sewage treatment efficiency and effect are provided.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a schematic configuration of a precision aeration apparatus according to an embodiment of the present invention.
Fig. 2 shows a flow chart of a precision aeration method according to one embodiment of the present invention.
Reference numerals illustrate:
1. a biological pond; 2. an aeration tank; 3. a first electrically operated regulator valve; 4. an ammonia nitrogen concentration detector; 5. a main water inlet pipe; 6. a water inlet flowmeter; 7. an on-line dissolved oxygen meter; 8. a blower; 9. an air pipe; 10. a second electric control valve; 11. a gas flow meter; 12. a pressure transmitter; 13. a distribution canal; 14. a non-aeration tank.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1, the present invention provides an accurate aeration apparatus, comprising:
the biological treatment device comprises a plurality of biological tanks 1, wherein each biological tank 1 comprises at least one aeration tank 2, the water inlet end of each biological tank 1 is provided with a first electric regulating valve 3, and the water outlet end of each biological tank 1 is provided with an ammonia nitrogen concentration detector 4;
the total water inlet pipe 5 is connected with the biological tanks 1, and a water inlet flowmeter 6 is arranged on the total water inlet pipe 5;
a plurality of on-line dissolved oxygen meters 7 respectively provided in the plurality of aeration tanks 2;
the air blower 8 is connected with the aeration tanks 2 through a plurality of air pipes 9, a second electric regulating valve 10 and a gas flowmeter 11 are arranged on each air pipe 9, and a pressure transmitter 12 is arranged on an air outlet of the air blower 8;
the controller is connected with the first electric regulating valve 3, the ammonia nitrogen concentration detector 4, the water inlet flowmeter 6, the online dissolved oxygen meter 7, the blower 8, the second electric regulating valve 10, the gas flowmeter 11 and the pressure transmitter 12.
Specifically, sewage enters a plurality of biological tanks 1 through a total water inlet pipe 5, and a water inlet flowmeter 6 is used for measuring total water inlet quantity; in one example, sewage enters 4 biological tanks 1, each configured with 2 aeration tanks 2; a first electric regulating valve 3 is arranged at the inlet of each biological pond 1 and is used for controlling the water quantity entering the biological pond 1; each aeration tank 2 in each biological tank 1 is provided with 1 on-line dissolved oxygen meter 7 for measuring the concentration of dissolved oxygen in the aeration tank 2; a second electric regulating valve 10 is arranged on the air pipe 9 entering each aeration tank 2 and is used for controlling the flow of air entering the aeration tank 2; a gas flowmeter 11 is arranged on the gas pipe 9 entering each aeration tank 2 and is used for measuring the gas flow entering the aeration tank 2; 4 blowers 8 are configured, and a pressure transmitter 12 is arranged on an air outlet main pipeline of each blower 8 and is used for measuring the pressure of a main gas pipeline; the method comprises the steps of configuring a controller, transmitting signals of a water inlet flowmeter 6, a pressure transmitter 12, an online dissolved oxygen meter 7, a gas flowmeter 11, a first electric regulating valve 3, a second electric regulating valve 10 and an ammonia nitrogen concentration detector 4 of each biological pond 1 to the controller, outputting pressure signals to blowers 8 by the controller, respectively outputting valve control signals to each valve, controlling the running state of each blower 8 by the pressure signals, and controlling the opening of each valve by the valve control signals; and then through the monitoring to first electronic governing valve 3, ammonia nitrogen concentration detector 4, intake flowmeter 6, online dissolved oxygen appearance 7, air-blower 8, second electronic governing valve 10, gas flowmeter 11, pressure transmitter 12, carry out accurate regulation to intake, air-blower pressure and aeration volume simultaneously, keep the stability of dissolved oxygen concentration in the biological pond 1.
Optionally, a distribution canal 13 is provided upstream of the biological tank 1, and the main inlet pipe 5 is connected to the distribution canal 13.
Specifically, sewage enters the distribution channel 13 from the main water inlet pipe 5, and enters each biological pond 1 through the distribution channel 13.
Optionally, each biological cell 1 further comprises at least one non-aerated tank 14.
In one example, there is one non-aeration tank 14 and two aeration tanks 2 in each biological tank 1.
Optionally, the controller comprises a blower control unit for controlling the inlet and outlet guide vane opening of the blower 8.
Specifically, the blower control unit is capable of receiving pressure signals, and further controlling the opening of inlet and outlet guide vanes of the plurality of blowers 8.
As shown in fig. 2, the present invention further provides a precise aeration method, based on the precise aeration device, the method includes:
setting an aeration tank dissolved oxygen concentration average value set value, an initial blower pressure value, a second electric regulating valve opening average value set value and an effluent ammonia nitrogen concentration set value;
respectively obtaining the average value of the dissolved oxygen concentration of the aeration tank in different biological tanks, and adjusting the opening of the first electric adjusting valve according to the average value of the dissolved oxygen concentration and the set value of the average value of the dissolved oxygen concentration of the aeration tank;
acquiring a second electric regulating valve opening mean value, and regulating an initial blower pressure value according to the dissolved oxygen concentration mean value, the second electric regulating valve opening mean value, an aeration tank dissolved oxygen concentration mean value set value and a second electric regulating valve opening mean value set value to acquire a blower pressure correction value;
obtaining an actual value of the ammonia nitrogen concentration of the effluent, and adjusting a mean value set value of the dissolved oxygen concentration of the aeration tank according to the actual value of the ammonia nitrogen concentration of the effluent and a set value of the ammonia nitrogen concentration of the effluent to obtain a corrected value of the dissolved oxygen concentration of the aeration tank;
and adjusting the opening of the second electric adjusting valve according to the corrected value of the dissolved oxygen concentration of the aeration tank and the actual value of the dissolved oxygen concentration of the aeration tank in different biological tanks.
Specifically, based on the accurate aeration device, the method simultaneously maintains the stability of the concentration of the dissolved oxygen in the biological pond from three aspects of adjustment, and the first aspect is to adjust the total water inflow according to the average value of the concentration of the dissolved oxygen and the set value of the average value of the concentration of the dissolved oxygen in the aeration pond; the second aspect is that the initial blower pressure value is corrected according to the dissolved oxygen concentration mean value, the opening mean value of the second electric regulating valve, the dissolved oxygen concentration mean value set value of the aeration tank and the opening mean value set value of the second electric regulating valve to obtain a blower pressure correction value; the third aspect is that firstly, the aeration tank dissolved oxygen concentration correction value is obtained by correcting the aeration tank dissolved oxygen concentration average value set value according to the effluent ammonia nitrogen concentration actual value and the effluent ammonia nitrogen concentration set value, and then the aeration quantity of the aeration tank is regulated according to the aeration tank dissolved oxygen concentration correction value and the actual dissolved oxygen concentration value of the aeration tank in different biological tanks; through the common regulation of the three aspects, the precise aeration is realized, and the sewage treatment efficiency and effect are provided.
Optionally, the obtaining the average value of the dissolved oxygen concentration of the aeration tank in the different biological tanks respectively comprises:
respectively obtaining the average value of dissolved oxygen concentration of aeration tanks in different biological tanks in a set time period before a preset time point;
the aeration tank is an aeration tank close to the water outlet end of the biological tank.
Specifically, as a plurality of aeration tanks can be arranged in each biological tank, when the method is executed, dissolved oxygen concentration average value of each aeration tank is calculated by taking dissolved oxygen concentration data in the aeration tank, which is close to the water outlet end of the biological tank, in each biological tank, so that the accuracy of aeration regulation and control can be improved; when calculating the average value of the dissolved oxygen concentration of the plurality of aeration tanks, the average value of the dissolved oxygen concentration of each aeration tank is obtained by taking the average value of the dissolved oxygen concentration values in a set time before a preset time point; in the time range between two adjacent preset time points, the average value of the dissolved oxygen concentration is calculated once.
Optionally, a plurality of preset time points are arranged, and an aeration tank dissolved oxygen concentration average value set value, an initial blower pressure value, a second electric regulating valve opening average value set value and an effluent ammonia nitrogen concentration set value are set at each preset time point.
Specifically, the plurality of preset time points are several times in 24 days, and the specific preset time points can be determined according to actual requirements and working conditions; meanwhile, according to actual demands and working conditions, the set value of the mean value of the dissolved oxygen concentration of the aeration tank, the set value of the pressure of the initial blower, the set value of the mean value of the opening of the second electric regulating valve and the set value of the ammonia nitrogen concentration of the effluent can be the same or different; different aeration tank dissolved oxygen concentration mean value set values, initial blower pressure values, second electric regulating valve opening mean value set values and effluent ammonia nitrogen concentration set values are set at each preset time point, so that the method can further accord with actual working conditions, and the aeration regulation and control are more flexible and accurate.
Optionally, adjusting the opening of the first electric adjusting valve according to the dissolved oxygen concentration average value and the aeration tank dissolved oxygen concentration average value set value includes:
calculating a first difference value between the dissolved oxygen concentration average value and a set value of the dissolved oxygen concentration average value of the aeration tank;
and comparing the first difference value with a first threshold value, and adjusting the opening degree of the first electric adjusting valve until the first difference value is in the first threshold value range when the first difference value is not in the first threshold value range.
Specifically, when a certain preset time point is reached, the average value of the dissolved oxygen concentration in the aeration tank of each biological tank in the previous 1 hour can be obtained, the average value of the dissolved oxygen concentration in the aeration tank of each biological tank and the set value of the average value of the dissolved oxygen concentration in the aeration tank are compared, a first difference value is recorded as delta A, a first threshold value is set as +/-n percent A, the opening of a first electric regulating valve on each biological tank is automatically regulated, and the first difference value is ensured to be within a first threshold value range; the value range of the first threshold can be set according to actual requirements.
Optionally, adjusting the initial blower pressure value according to the dissolved oxygen concentration average value, the opening average value of the second electric regulating valve, the dissolved oxygen concentration average value set value of the aeration tank, and the opening average value set value of the second electric regulating valve to obtain the blower pressure correction value includes:
calculating a second difference value between the set value of the dissolved oxygen concentration average value of the aeration tank and the average value of the dissolved oxygen concentration;
calculating a third difference value between the opening mean value set value of the second electric regulating valve and the opening mean value of the second electric regulating valve;
comparing the second difference value with a second threshold value, comparing the third difference value with a third threshold value, and taking the sum of the initial blower pressure value and the set pressure increment value as a blower pressure correction value when the second difference value is larger than the upper limit of the second threshold value and the third difference value is smaller than the lower limit of the third threshold value;
when the second difference is less than the lower limit of the second threshold and the third difference is greater than the upper limit of the third threshold, the difference between the initial blower pressure value and the set pressure reduction value is taken as a blower pressure correction value.
Specifically, when a certain moment is reached, setting the set pressure value of the initial blower as P, and setting the average value of the dissolved oxygen concentration as D within a set time before the moment is obtained, wherein the time can be 1 hour; the average value of the opening of the second electric control valve corresponding to the aeration tank in different biological tanks is obtained, the average value of the opening of the second electric control valve is set to be W, the opening of the second electric control valve is a real-time value, and in the embodiment, the second electric control valve corresponding to the aeration tank in different biological tanks for calculating the average value of the opening of the second electric control valve is a second electric control valve connected to the aeration tank close to the water outlet end of the biological tank; setting a mean value set value of the dissolved oxygen concentration of the aeration tank as Da, and taking Da and D as differences to obtain a difference value delta D, namely a second difference value, and setting a second threshold value as +/-n% D; the value range of the second threshold can be set according to actual requirements. Setting the average value of the opening of the second electric regulating valve as Wa, and taking the Wa and W as difference to obtain a difference value delta W, namely a third difference value, setting a third threshold value as + -n% W, wherein the value range of the third threshold value can be set according to actual requirements. Comparing the second difference value with the second threshold value, the third difference value and the third threshold value, and if the second difference value is larger than the upper limit of the second threshold value and the third difference value is smaller than the lower limit of the third threshold value, increasing the set pressure P by delta P1, wherein delta P1 is the set pressure increasing value; if the second difference value is smaller than the lower limit of the second threshold value and the third difference value is larger than the upper limit of the third threshold value, the set pressure P is reduced by delta P2, and delta P2 is the set pressure reduction value; otherwise, the set pressure P is kept unchanged. And transmitting the corrected blower pressure correction value to a blower control unit (MCP), and automatically adjusting the opening degree of guide vanes of each blower by the blower control unit according to the received blower pressure correction value so that the gas pressure in the gas pipe reaches the blower pressure correction value.
Optionally, adjusting the aeration tank dissolved oxygen concentration average value set value according to the effluent ammonia nitrogen concentration actual value and the effluent ammonia nitrogen concentration set value to obtain the aeration tank dissolved oxygen concentration correction value comprises:
calculating a fourth difference value between the actual ammonia nitrogen concentration value of the water and the set ammonia nitrogen concentration value of the water;
comparing the fourth difference value with a fourth threshold value, and when the fourth difference value is within the fourth threshold value, maintaining the set value of the mean value of the dissolved oxygen concentration of the aeration tank;
when the fourth difference value is larger than the upper limit of the fourth threshold value, taking the sum of the set value of the mean value of the dissolved oxygen concentration of the aeration tank and the set value of the increase of the dissolved oxygen concentration as a corrected value of the dissolved oxygen concentration of the aeration tank;
when the fourth difference value is smaller than the lower limit of the fourth threshold value, taking the difference value between the set value of the mean value of the dissolved oxygen concentration of the aeration tank and the set value of the reduced value of the dissolved oxygen concentration as a corrected value of the dissolved oxygen concentration of the aeration tank;
the opening of the second electric regulating valve is regulated according to the corrected value of the dissolved oxygen concentration of the aeration tank and the actual value of the dissolved oxygen concentration of the aeration tank in different biological tanks, and the method comprises the following steps:
respectively calculating the difference value of the actual dissolved oxygen concentration value of the aeration tank and the dissolved oxygen concentration correction value of the aeration tank in different biological tanks;
calculating the required aeration quantity of the aeration tanks in different biological tanks through a PID algorithm according to the difference value between the actual dissolved oxygen concentration value of the aeration tank in different biological tanks and the dissolved oxygen concentration correction value of the aeration tank;
calculating a fifth difference value between the actual air inflow of the aeration tank in the different biological tanks and the required aeration amount of the aeration tank in the different biological tanks;
and comparing the fifth difference value with a fifth threshold value, and adjusting the opening degree of the second electric adjusting valve until the fifth difference value is in the fifth threshold value range when the fifth difference value is not in the fifth threshold value range.
Specifically, according to the actual value of the effluent ammonia nitrogen concentration measured by the actual effluent ammonia nitrogen concentration meter and the set value of the effluent ammonia nitrogen concentration, a fourth difference value is calculated and recorded as delta G, a fourth threshold value is set as +/-n% G, and if the fourth difference value is within the fourth threshold value range, the set value of the average value of the dissolved oxygen concentration of each aeration tank in each biological tank is kept unchanged; if the fourth difference is greater than the upper limit of the fourth threshold, then individual aeration tanks within each biological tank are selected such as: the average value set value of the dissolved oxygen concentration of the aeration tank I and the aeration tank II is respectively increased by delta DO1 and delta DO2 to obtain the corrected value of the dissolved oxygen concentration of the aeration tank; if the fourth difference value is smaller than the lower limit of the fourth threshold value, respectively reducing the average value set value of the dissolved oxygen concentration of the aeration tank I and the aeration tank II by delta DO3 and delta DO4 to obtain a corrected value of the dissolved oxygen concentration of the aeration tank; calculating the required aeration quantity of the aeration tanks in different biological tanks through a PID algorithm according to the difference value between the actual dissolved oxygen concentration value of the aeration tank in the different biological tanks and the corrected value of the dissolved oxygen concentration of the aeration tank, recording the difference value between the actual air inflow of the aeration tank in the different biological tanks and the required aeration quantity of the aeration tank in the different biological tanks according to the comparison of the gas flow measurement installed in the aeration tank in the different biological tanks, setting a fifth threshold value as +/-n% G, and automatically adjusting the opening degree by taking a second electric regulating valve of the aeration tank in the different biological tanks as an actuating mechanism until the fifth difference value is in a fifth threshold value range.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.

Claims (4)

1. An accurate aeration method is based on an accurate aeration device, which is characterized in that the device comprises:
the biological treatment device comprises a plurality of biological tanks, wherein each biological tank comprises at least one aeration tank, a water inlet end of each biological tank is provided with a first electric regulating valve, and a water outlet end of each biological tank is provided with an ammonia nitrogen concentration detector;
the total water inlet pipe is connected with a plurality of biological tanks, and a water inlet flowmeter is arranged on the total water inlet pipe;
the on-line dissolved oxygen meters are respectively arranged in the aeration tanks;
the air blower is connected with the aeration tanks through a plurality of air pipes, a second electric regulating valve and a gas flowmeter are arranged on each air pipe, and a pressure transmitter is arranged on an air outlet of the air blower;
the controller is connected with the first electric regulating valve, the ammonia nitrogen concentration detector, the water inlet flowmeter, the online dissolved oxygen meter, the blower, the second electric regulating valve, the gas flowmeter and the pressure transmitter;
the method comprises the following steps:
setting an aeration tank dissolved oxygen concentration average value set value, an initial blower pressure value, a second electric regulating valve opening average value set value and an effluent ammonia nitrogen concentration set value;
respectively obtaining the average value of dissolved oxygen concentration of aeration tanks in different biological tanks, and adjusting the opening of a first electric adjusting valve according to the average value of dissolved oxygen concentration and a set value of the average value of dissolved oxygen concentration of the aeration tanks;
acquiring a second electric regulating valve opening mean value, and regulating the initial blower pressure value according to the dissolved oxygen concentration mean value, the second electric regulating valve opening mean value, the aeration tank dissolved oxygen concentration mean value set value and the second electric regulating valve opening mean value set value to acquire a blower pressure correction value;
obtaining an actual value of the ammonia nitrogen concentration of the effluent, and adjusting a mean value set value of the dissolved oxygen concentration of the aeration tank according to the actual value of the ammonia nitrogen concentration of the effluent and the set value of the ammonia nitrogen concentration of the effluent to obtain a corrected value of the dissolved oxygen concentration of the aeration tank;
the opening of the first electric regulating valve is regulated according to the dissolved oxygen concentration average value and the aeration tank dissolved oxygen concentration average value set value, and the opening of the first electric regulating valve comprises:
calculating a first difference value between the dissolved oxygen concentration average value and a set value of the dissolved oxygen concentration average value of the aeration tank;
comparing the first difference value with a first threshold value, and adjusting the opening degree of the first electric adjusting valve until the first difference value is in the first threshold value range when the first difference value is not in the first threshold value range;
the opening degree of the second electric regulating valve is regulated according to the corrected value of the dissolved oxygen concentration of the aeration tank and the actual value of the dissolved oxygen concentration of the aeration tank in different biological tanks;
the step of adjusting the initial blower pressure value according to the dissolved oxygen concentration average value, the second electric regulating valve opening average value, the aeration tank dissolved oxygen concentration average value set value and the second electric regulating valve opening average value set value to obtain a blower pressure correction value comprises the following steps:
calculating a second difference value between the set value of the dissolved oxygen concentration average value of the aeration tank and the average value of the dissolved oxygen concentration;
calculating a third difference value between the opening mean value set value of the second electric regulating valve and the opening mean value of the second electric regulating valve;
comparing the second difference value with a second threshold value, comparing the third difference value with a third threshold value, and taking the sum of the initial blower pressure value and a set pressure increase value as the blower pressure correction value when the second difference value is greater than the upper limit of the second threshold value and the third difference value is less than the lower limit of the third threshold value;
when the second difference is less than the lower limit of the second threshold and the third difference is greater than the upper limit of the third threshold, taking the difference of the initial blower pressure value and the set pressure reduction value as the blower pressure correction value;
the step of adjusting the aeration tank dissolved oxygen concentration average value set value according to the effluent ammonia nitrogen concentration actual value and the effluent ammonia nitrogen concentration set value to obtain an aeration tank dissolved oxygen concentration correction value comprises the following steps:
calculating a fourth difference value between the actual value of the ammonia nitrogen concentration of the effluent and the set value of the ammonia nitrogen concentration of the effluent;
comparing the fourth difference value with a fourth threshold value, and when the fourth difference value is within the fourth threshold value, maintaining the mean value set value of the dissolved oxygen concentration of the aeration tank;
when the fourth difference value is larger than the upper limit of the fourth threshold value, taking the sum of the set value of the mean value of the dissolved oxygen concentration of the aeration tank and the set value of the increase of the dissolved oxygen concentration as the corrected value of the dissolved oxygen concentration of the aeration tank;
when the fourth difference value is smaller than the lower limit of the fourth threshold value, taking the difference value between the mean value set value of the dissolved oxygen concentration of the aeration tank and the set reduction value of the dissolved oxygen concentration as the dissolved oxygen concentration correction value of the aeration tank;
the opening degree adjusting of the second electric adjusting valve according to the corrected value of the dissolved oxygen concentration of the aeration tank and the actual value of the dissolved oxygen concentration of the aeration tank in different biological tanks comprises:
respectively calculating the difference value between the actual dissolved oxygen concentration value of the aeration tank in different biological tanks and the dissolved oxygen concentration correction value of the aeration tank;
calculating the required aeration quantity of the aeration tanks in different biological tanks through a PID algorithm according to the difference value between the actual dissolved oxygen concentration value of the aeration tank in different biological tanks and the dissolved oxygen concentration correction value of the aeration tank;
calculating a fifth difference value between the actual air inflow of the aeration tank in the different biological tanks and the required aeration amount of the aeration tank in the different biological tanks;
comparing the fifth difference value with a fifth threshold value, and adjusting the opening degree of the second electric adjusting valve until the fifth difference value is in the fifth threshold value range when the fifth difference value is not in the fifth threshold value range;
the step of respectively obtaining the average value of the dissolved oxygen concentration of the aeration tanks in different biological tanks comprises the following steps:
respectively obtaining the average value of dissolved oxygen concentration of aeration tanks in different biological tanks in a set time period before a preset time point;
the aeration tank is an aeration tank close to the water outlet end of the biological tank;
the aeration tank dissolved oxygen concentration average value set value, the initial blower pressure value, the second electric regulating valve opening average value set value and the effluent ammonia nitrogen concentration set value are set at each preset time point, wherein the setting of the preset time point is determined according to actual requirements and working conditions, and the aeration tank dissolved oxygen concentration average value set at each preset time point, the initial blower pressure value, the second electric regulating valve opening average value set value and the effluent ammonia nitrogen concentration set value can be the same or different according to the actual requirements and the working conditions.
2. The precision aeration method of claim 1, wherein a distribution canal is provided upstream of the biological tank, and the total water inlet pipe is connected to the distribution canal.
3. The precision aeration method of claim 1, wherein each of said biological cells further comprises at least one non-aeration cell.
4. The precise aeration method of claim 1, wherein the controller comprises a blower control unit for controlling an inlet and outlet guide vane opening of the blower.
CN202111578040.0A 2021-12-22 2021-12-22 Accurate aeration device and method Active CN114249415B (en)

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DE3034855A1 (en) * 1980-09-16 1982-04-22 Linde Ag, 6200 Wiesbaden DEVICE AND DEVICE FOR TREATING WATER WITH OZONE
JP2950661B2 (en) * 1991-11-05 1999-09-20 株式会社東芝 Control unit for water treatment plant
JP3737687B2 (en) * 2000-09-14 2006-01-18 株式会社タクマ Deoxygenation device for water supply
CN201694928U (en) * 2010-03-26 2011-01-05 北京城市排水集团有限责任公司 Water inlet adjustable weir control device of sewage treatment plant
CN108585173B (en) * 2018-05-14 2020-11-03 清华大学 Optimal energy consumption control device and method for blast system of sewage treatment plant
CN109205808A (en) * 2018-10-11 2019-01-15 首创爱华(天津)市政环境工程有限公司 A kind of accurate aeration control method based on water outlet ammonia nitrogen and dissolved oxygen
CN109592804B (en) * 2018-12-28 2023-09-05 中原环保股份有限公司 Sewage treatment near-optimal precise aeration method
CN113213646A (en) * 2021-04-29 2021-08-06 北京城市排水集团有限责任公司 Blower control device and control method for sewage treatment system

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