CN113342070A - Air volume control system, method, controller and computer readable storage medium - Google Patents
Air volume control system, method, controller and computer readable storage medium Download PDFInfo
- Publication number
- CN113342070A CN113342070A CN202110643125.6A CN202110643125A CN113342070A CN 113342070 A CN113342070 A CN 113342070A CN 202110643125 A CN202110643125 A CN 202110643125A CN 113342070 A CN113342070 A CN 113342070A
- Authority
- CN
- China
- Prior art keywords
- dissolved oxygen
- oxygen concentration
- fan
- concentration value
- threshold value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 54
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 314
- 239000001301 oxygen Substances 0.000 claims abstract description 314
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 314
- 230000001105 regulatory effect Effects 0.000 claims abstract description 124
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 230000001276 controlling effect Effects 0.000 claims description 42
- 238000004065 wastewater treatment Methods 0.000 claims description 31
- 230000003750 conditioning effect Effects 0.000 claims description 19
- 238000004590 computer program Methods 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 18
- 241001148470 aerobic bacillus Species 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 21
- 238000005273 aeration Methods 0.000 description 12
- 230000033228 biological regulation Effects 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000006870 function Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000036284 oxygen consumption Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000208125 Nicotiana Species 0.000 description 1
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
- G05D7/0635—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means by action on throttling means
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Microbiology (AREA)
- Environmental & Geological Engineering (AREA)
- Biodiversity & Conservation Biology (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Activated Sludge Processes (AREA)
Abstract
The present disclosure provides an air volume control system, method, controller and computer readable storage medium. This amount of wind control system includes: the first dissolved oxygen sensor is arranged in the regulating reservoir and used for measuring a first dissolved oxygen concentration value of liquid in the regulating reservoir; the second dissolved oxygen sensor is arranged in the biochemical tank and used for measuring a second dissolved oxygen concentration value of the liquid in the biochemical tank; and the controller is used for adjusting the valve opening of the electric regulating valve according to the first dissolved oxygen concentration value and adjusting the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value. The air quantity delivered to the regulating tank and the biochemical tank can be regulated, so that the air quantity process requirements of the biochemical tank and the regulating tank are met, and the treatment efficiency of biochemical aerobic bacteria in the biochemical tank is ensured as much as possible.
Description
Technical Field
The disclosure relates to the field of industrial wastewater treatment in the tobacco industry, in particular to an air volume control system, an air volume control method, a controller and a computer-readable storage medium.
Background
The power plant wastewater treatment station adopts buried sewage treatment. For example, 2 15kW aero-levitation fans may be provided, operating for 24 hours, one fan operating, and the other fan switching once a week as a backup fan. The fan supplies air to the biochemical pool and the regulating pool through the air supply pipeline, provides oxygen for the biochemical aerobic bacteria in the pool, guarantees the living environment of the biochemical aerobic bacteria and meets the requirement of sewage treatment.
Disclosure of Invention
The technical problem that this disclosure solved is: an air volume control system for a wastewater treatment plant is provided to regulate the air volume delivered to a conditioning tank and a biochemical tank.
According to an aspect of the present disclosure, there is provided an air volume control system for a wastewater treatment apparatus, wherein the wastewater treatment apparatus includes a blower, an air supply duct, an electric control valve, a regulation tank, and a biochemical tank, the blower is configured to supply air to the regulation tank and the biochemical tank through the air supply duct, respectively, the air supply duct includes a first branch duct disposed between the blower and the regulation tank and a second branch duct disposed between the blower and the biochemical tank, the electric control valve is disposed on the first branch duct, and the blower includes a blower inverter; the air volume control system includes: a first dissolved oxygen sensor disposed within the conditioning tank for measuring a first dissolved oxygen concentration value of the liquid in the conditioning tank; the second dissolved oxygen sensor is arranged in the biochemical pool and used for measuring a second dissolved oxygen concentration value of the liquid in the biochemical pool; and the controller is used for adjusting the valve opening of the electric regulating valve according to the first dissolved oxygen concentration value and adjusting the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value.
In some embodiments, the controller is configured to control the valve opening of the electrically-operated control valve to be increased if the first dissolved oxygen concentration value is less than a first dissolved oxygen threshold value, to be decreased if the first dissolved oxygen concentration value is greater than a second dissolved oxygen threshold value, and to be unchanged if the first dissolved oxygen concentration value is greater than or equal to the first dissolved oxygen threshold value and the first dissolved oxygen concentration value is less than or equal to the second dissolved oxygen threshold value, wherein the first dissolved oxygen threshold value is less than the second dissolved oxygen threshold value.
In some embodiments, the controller is configured to control the output frequency of the fan inverter to be increased if the second dissolved oxygen concentration value is less than a third dissolved oxygen threshold value, to be decreased if the second dissolved oxygen concentration value is greater than a fourth dissolved oxygen threshold value, and to be unchanged if the second dissolved oxygen concentration value is greater than or equal to the third dissolved oxygen threshold value and the second dissolved oxygen concentration value is less than or equal to the fourth dissolved oxygen threshold value, where the third dissolved oxygen threshold value is less than the fourth dissolved oxygen threshold value.
In some embodiments, the controller is further configured to determine whether the fan can provide a predetermined wind pressure in the adjusted frequency operation after controlling to reduce the output frequency of the fan frequency converter, and if the fan can provide the predetermined wind pressure in the adjusted frequency operation, continue to control to reduce the output frequency of the fan frequency converter, otherwise, stop reducing the output frequency of the fan frequency converter.
In some embodiments, the air volume control system further comprises: the liquid level detector is arranged in the regulating reservoir and is used for detecting the liquid level of the liquid in the regulating reservoir; the controller is further used for controlling to close a valve of the electric regulating valve under the condition that the liquid level of the liquid in the regulating reservoir is smaller than a liquid level threshold value, and regulating the valve opening of the electric regulating valve according to the first dissolved oxygen concentration value and regulating the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value under the condition that the liquid level of the liquid in the regulating reservoir is larger than or equal to the liquid level threshold value.
According to another aspect of the present disclosure, there is provided an air volume control method for a wastewater treatment apparatus, wherein the wastewater treatment apparatus includes a blower, an air supply duct, an electric control valve, a regulation tank, and a biochemical tank, the blower is configured to supply air to the regulation tank and the biochemical tank through the air supply duct, respectively, the air supply duct includes a first branch duct disposed between the blower and the regulation tank and a second branch duct disposed between the blower and the biochemical tank, the electric control valve is disposed on the first branch duct, and the blower includes a blower inverter; the air volume control method comprises the following steps: acquiring a first dissolved oxygen concentration value of the liquid in the regulating tank and a second dissolved oxygen concentration value of the liquid in the biochemical tank; and adjusting the valve opening of the electric adjusting valve according to the first dissolved oxygen concentration value, and adjusting the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value.
In some embodiments, the step of adjusting the valve opening of the electrically actuated regulator valve based on the first dissolved oxygen concentration value comprises: controlling to increase the valve opening of the electric control valve under the condition that the first dissolved oxygen concentration value is smaller than a first dissolved oxygen threshold value; controlling to reduce the valve opening of the electric control valve under the condition that the first dissolved oxygen concentration value is greater than a second dissolved oxygen threshold value; and controlling the valve opening of the electric control valve to be unchanged under the condition that the first dissolved oxygen concentration value is greater than or equal to the first dissolved oxygen threshold value and the first dissolved oxygen concentration value is less than or equal to the second dissolved oxygen threshold value; wherein the first dissolved oxygen threshold is less than the second dissolved oxygen threshold.
In some embodiments, the step of adjusting the output frequency of the fan frequency converter based on the second dissolved oxygen concentration value comprises: under the condition that the second dissolved oxygen concentration value is smaller than a third dissolved oxygen threshold value, controlling to increase the output frequency of the fan frequency converter; under the condition that the second dissolved oxygen concentration value is larger than a fourth dissolved oxygen threshold value, controlling to reduce the output frequency of the fan frequency converter; and controlling the output frequency of the fan frequency converter to be unchanged under the condition that the second dissolved oxygen concentration value is greater than or equal to the third dissolved oxygen threshold value and the second dissolved oxygen concentration value is less than or equal to the fourth dissolved oxygen threshold value; wherein the third dissolved oxygen threshold is less than the fourth dissolved oxygen threshold.
In some embodiments, the air volume control method further includes: after controlling and reducing the output frequency of the fan frequency converter, judging whether the fan can provide preset wind pressure under the operation of the adjusted frequency; if the fan can provide the preset wind pressure under the operation of the adjusted frequency, continuing to control and reduce the output frequency of the fan frequency converter; otherwise, stopping reducing the output frequency of the fan frequency converter.
In some embodiments, the air volume control method further includes: acquiring the liquid level of the liquid in the regulating reservoir; controlling to close a valve of the electric regulating valve under the condition that the liquid level of the liquid in the regulating reservoir is less than a liquid level threshold value; and executing the step of adjusting the valve opening of the electric regulating valve and the output frequency of the fan frequency converter under the condition that the liquid level of the liquid in the regulating reservoir is greater than or equal to the liquid level threshold value.
According to another aspect of the present disclosure, there is provided a controller including: a memory; and a processor coupled to the memory, the processor configured to perform the method as previously described based on instructions stored in the memory.
According to another aspect of the disclosure, there is provided a non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the method as previously described.
In the air volume control system, the first dissolved oxygen sensor is used for measuring a first dissolved oxygen concentration value of liquid in the regulating tank, the second dissolved oxygen sensor is used for measuring a second dissolved oxygen concentration value of liquid in the biochemical tank, and the controller is used for regulating the valve opening of the electric regulating valve according to the first dissolved oxygen concentration value and regulating the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value. Therefore, the air quantity conveyed to the regulating tank and the biochemical tank can be regulated, so that the air quantity process requirements of the biochemical tank and the regulating tank are met, and the treatment efficiency of biochemical aerobic bacteria in the biochemical tank is ensured as much as possible.
Other features of the present disclosure and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram illustrating the construction of a wastewater treatment plant according to some embodiments of the present disclosure;
FIG. 2 is a schematic diagram illustrating a partial structure of a wastewater treatment plant according to some embodiments of the present disclosure;
FIG. 3 is a schematic diagram illustrating the configuration of an air volume control system for a wastewater treatment plant according to some embodiments of the present disclosure;
FIG. 4 is a schematic diagram illustrating an air volume control system for a wastewater treatment plant according to further embodiments of the present disclosure;
FIG. 5 is a flow chart illustrating an air volume control method for a wastewater treatment plant according to some embodiments of the present disclosure;
FIG. 6 is a flow chart illustrating an air volume control method for a wastewater treatment plant according to further embodiments of the present disclosure;
FIG. 7 is a schematic diagram illustrating the structure of a controller according to some embodiments of the present disclosure;
FIG. 8 is a schematic diagram illustrating a configuration of a controller according to further embodiments of the present disclosure;
fig. 9 is a schematic diagram showing electrical connections of a controller of an air volume control system according to some embodiments of the present disclosure.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic diagram illustrating the structure of a wastewater treatment apparatus according to some embodiments of the present disclosure.
As shown in fig. 1, the wastewater treatment apparatus may include a blower (e.g., blower 101 and/or blower 102), a supply air duct 110, an electric control valve 120, a conditioning tank 130, and a biochemical tank 140. The blower 101 or 102 is configured to blow air to the conditioning tank 130 and the biochemical tank 140, respectively, through the blowing duct 110. The air supply duct 110 includes a first branch duct 111 provided between the blower and the conditioning tank 130 and a second branch duct 112 provided between the blower and the biochemical tank 140. For example, the first branch pipe 111 employs a DN65 type pipe, and the second branch pipe 112 employs a DN130 type pipe. An electric control valve 120 is provided on the first branch piping 111. For example, the electric control valve is a normally closed electric control valve. The fan includes the fan converter. That is, the fan inverter is a component of the fan.
In some embodiments, the wastewater treatment plant may further include a flow meter 150 disposed on the first branch conduit. The flow meter 150 can be used to detect the air volume in the first branch duct 111. The flow meter 150 is, for example, a thermal mass flow meter. In addition, optionally, as shown in fig. 1, the wastewater treatment apparatus may further include a first gate valve 161, a second gate valve 162, a first check valve 171, and a second check valve 172.
In the related art, the first branch duct (also referred to as a surge tank supply duct) 111 controls the amount of air flow by the cooperation of the flow meter 150 and the electrical control valve 120. The liquid level of the biochemical pool is maintained at about 6 meters, and the liquid level of the adjusting pool fluctuates up and down at 2-5 meters according to the field conditions.
In the related art, the fan operation frequency is set at a fixed value in order to satisfy the maximum air volume demand of the biochemical tank and the conditioning tank. For example, when the biochemical pond is maintained at a maximum liquid level of about 6m and the regulating pond is maintained at a maximum liquid level of about 5m, the fan frequency can be fixed at 75Hz (the fan operating power is 11.2 kW). The total aeration quantity of the outlet is 11.0m displayed by a blower HMI (Human Machine Interface) Interface3Min, when the feedback opening of the electric control valve 120 is 75% measured by the flowmeter 150 on the air supply pipeline of the regulating reservoir, the air quantity is 2.0m3Min, the air volume of the air supply pipeline (i.e. the second branch pipeline 112) of the biochemical pool is 9.0m3And/min. Meanwhile, the air pressure provided by the fan is 0.682bar, and the requirement of 0.6bar for the maximum air pressure of the biochemical tank and the adjusting tank is also met.
Currently, biological treatment in sewage treatment mostly adopts a treatment process combining anaerobic treatment and aerobic treatment, and dissolved oxygen DO plays an important role in actual biological wastewater treatment operation. The amount of dissolved oxygen in water is an index for representing the self-purification capacity of the water body, and the high amount of dissolved oxygen is favorable for degrading various pollutants in the water body, so that the water body can be purified quickly; on the contrary, the dissolved oxygen is low, and the pollutants in the water body are degraded slowly. The dissolved oxygen content in water is affected by two effects: one is the oxygen consumption function for lowering DO, which comprises the oxygen consumption of aerobic organic matter degradation and advanced metabolism oxygen consumption; the other is reoxygenation for increasing DO, mainly including oxygen dissolution in air, aeration means, etc. The two actions are mutually eliminated, so that the dissolved oxygen content in water shows space-time change. Improper or excessive fluctuation of this index can quickly result in impact on the activated sludge system, which in turn affects treatment efficiency. Therefore, in the actual biochemical treatment process, the content of dissolved oxygen needs to be strictly controlled.
The equalizing basin carries out the preliminary aeration for waste water and handles, and according to on-the-spot actual conditions, the equalizing basin liquid level fluctuates about 2-5 meters, and the amount of wind demand correspondingly reduces when the actual liquid level of equalizing basin is less than 5 meters, and the equalizing basin supplies the gas with the highest amount of wind demand of about 5 meters of highest liquid level, has the condition of supplying more than asking, causes certain energy waste. At this time, if the air volume is reduced by controlling the valve opening of the normally closed electric regulating valve on the air supply pipeline of the regulating reservoir, the total aeration volume of the fan outlet is constant, so that the redundant air volume is completely supplied to the biochemical pool, the air volume supply of the biochemical pool is overlarge, the dissolved oxygen in the biochemical pool is increased (for example, for the biochemical pool, the dissolved oxygen is generally controlled to be about 4-5 mg/L to be proper), and the self-oxidation of microorganisms is influenced, so that the activated sludge system is impacted, the treatment capacity is reduced, and the treatment efficiency is further influenced.
In view of this, the present disclosure provides an air volume control system for a wastewater treatment plant to regulate the air volume delivered to a conditioning tank and a biochemical tank.
Fig. 2 is a schematic diagram illustrating a partial structure of a wastewater treatment apparatus according to some embodiments of the present disclosure. Fig. 3 is a schematic diagram illustrating the structure of an air volume control system for a wastewater treatment plant according to some embodiments of the present disclosure.
As shown in fig. 3, the air volume control system 200 includes a first dissolved oxygen sensor 210, a second dissolved oxygen sensor 220, and a controller 230. The first dissolved oxygen sensor 210 and the second dissolved oxygen sensor 220 are electrically connected to the controller 230, respectively. Additionally, an electrically variable valve 120 and a fan inverter 1030 are also shown in FIG. 3. The fan frequency converter 1030 is a fan frequency converter arranged in the fan 101 or 102. The electric control valve 120 and the fan inverter 1030 are electrically connected to the controller 230, respectively.
As shown in fig. 2, the first dissolved oxygen sensor 210 is disposed in the conditioning tank 130. The first dissolved oxygen sensor is configured to measure a first dissolved oxygen concentration value of the liquid in the conditioning tank 130. The first dissolved oxygen sensor transmits a first dissolved oxygen concentration value to the controller 230.
As shown in fig. 2, the second dissolved oxygen sensor 220 is disposed in the biochemical tank 140. The second dissolved oxygen sensor 220 is used to measure a second dissolved oxygen concentration value of the liquid in the biochemical tank 140. The second dissolved oxygen sensor 220 transmits a second dissolved oxygen concentration value to the controller 230.
For example, as shown in FIG. 2, since the biochemical tank of the wastewater treatment plant is maintained at a level of about H0 (e.g., 6 meters), and the conditioning tank level fluctuates about 2-5 meters depending on the field conditions, the first dissolved oxygen sensor 210 may be fixedly installed at a height H1 above the bottom of the conditioning tank 130, and the second dissolved oxygen sensor 220 may be fixedly installed at a height H2 above the bottom of the biochemical tank 140. For example, H1 is 2.5 meters and H2 is 2.5 meters. Of course, those skilled in the art will appreciate that the installation heights of the first and second dissolved oxygen sensors 210 and 220 are merely exemplary, and the scope of the present disclosure is not limited thereto.
For example, the first dissolved oxygen sensor 210 and the second dissolved oxygen sensor 220 may employ a dissolved oxygen sensor model DO-OOS-K, GO-SYSTEMELEKETRONIK, Germany. The first dissolved oxygen sensor 210 may output a 4 to 20mA analog output signal (as a first dissolved oxygen concentration value) measured from the adjustment tank to the controller 230, and the second dissolved oxygen sensor 220 may output a 4 to 20mA analog output signal (as a second dissolved oxygen concentration value) measured from the biochemical tank to the controller 230.
The controller 230 is configured to adjust a valve opening of the electrical control valve 120 according to the first dissolved oxygen concentration value, and adjust an output frequency of the fan frequency converter 1030 according to the second dissolved oxygen concentration value.
For example, the controller may first adjust the valve opening of the electric control valve 120 according to the first dissolved oxygen concentration value, so as to adjust the air volume in the first branch pipe 111 (i.e., the conditioning tank air supply pipe), and then adjust the output frequency of the fan frequency converter 1030 according to the second dissolved oxygen concentration value, so as to adjust the total aeration volume at the outlet of the fan 101 or 102, thereby adjusting the air volume of the biochemical tank. Therefore, the dissolved oxygen indexes of the regulating tank and the biochemical tank can be maintained in a proper interval as far as possible.
In some embodiments, the controller may include a CPU (Central Processing Unit) Unit and an analog input/output module.
Fig. 9 is a schematic diagram showing electrical connections of a controller of an air volume control system according to some embodiments of the present disclosure. For example, as shown in fig. 9, the CPU unit may be a CPU unit of model ST200, and the analog input/output module may be an analog input/output module of model EM AM 06. Known connection relationships can be adopted for the connection relationships between the CPU and the analog input/output module and other signals or sensors, as shown in fig. 9, and will not be described in detail here.
Thus far, air volume control systems according to some embodiments of the present disclosure have been described. This amount of wind control system includes: the first dissolved oxygen sensor is arranged in the regulating reservoir and used for measuring a first dissolved oxygen concentration value of liquid in the regulating reservoir; the second dissolved oxygen sensor is arranged in the biochemical tank and used for measuring a second dissolved oxygen concentration value of the liquid in the biochemical tank; and the controller is used for adjusting the valve opening of the electric regulating valve according to the first dissolved oxygen concentration value and adjusting the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value. The air quantity control system can adjust the air quantity conveyed to the regulating tank and the biochemical tank, thereby meeting the air quantity process requirements of the biochemical tank and the regulating tank and ensuring the treatment efficiency of biochemical aerobic bacteria in the biochemical tank as much as possible.
In some embodiments, the controller 230 is configured to control the valve opening of the electrically-operated regulator valve to increase if the first dissolved oxygen concentration value is less than the first dissolved oxygen threshold value, to decrease if the first dissolved oxygen concentration value is greater than the second dissolved oxygen threshold value, and to control the valve opening of the electrically-operated regulator valve to be constant if the first dissolved oxygen concentration value is greater than or equal to the first dissolved oxygen threshold value and the first dissolved oxygen concentration value is less than or equal to the second dissolved oxygen threshold value. The first dissolved oxygen threshold is less than the second dissolved oxygen threshold.
For example, the first dissolved oxygen threshold may range from 2mg/L to 4mg/L and the second dissolved oxygen threshold may range from 5mg/L to 6 mg/L. Of course, those skilled in the art will appreciate that the first and second dissolved oxygen thresholds herein are merely exemplary, and the scope of the present disclosure is not so limited. The first dissolved oxygen threshold and the second dissolved oxygen threshold can be set by those skilled in the art according to actual needs.
In the above embodiment, the controller controls to increase the valve opening of the electrically-operated regulating valve in a case where the first dissolved oxygen concentration value is smaller than the first dissolved oxygen threshold value, so that the amount of air delivered to the regulating reservoir can be increased; the opening degree of a valve of the electric regulating valve is controlled to be reduced under the condition that the first dissolved oxygen concentration value is larger than the second dissolved oxygen threshold value, so that the air quantity conveyed to the regulating tank can be reduced; and controlling the opening degree of the valve of the electric regulating valve to be unchanged under the condition that the first dissolved oxygen concentration value is greater than or equal to the first dissolved oxygen threshold value and the first dissolved oxygen concentration value is less than or equal to the second dissolved oxygen threshold value, so that the air volume conveyed to the regulating tank can be kept unchanged.
In some embodiments, the controller 230 is configured to control the output frequency of the fan inverter to be increased if the second dissolved oxygen concentration value is less than a third dissolved oxygen threshold value, to be decreased if the second dissolved oxygen concentration value is greater than a fourth dissolved oxygen threshold value, and to be unchanged if the second dissolved oxygen concentration value is greater than or equal to the third dissolved oxygen threshold value and the second dissolved oxygen concentration value is less than or equal to the fourth dissolved oxygen threshold value. The third dissolved oxygen threshold is less than the fourth dissolved oxygen threshold.
For example, the third dissolved oxygen threshold may range from 2mg/L to 4mg/L and the fourth dissolved oxygen threshold may range from 5mg/L to 6 mg/L. Of course, those skilled in the art will appreciate that the third and fourth dissolved oxygen thresholds are merely exemplary and that the scope of the present disclosure is not so limited. The third dissolved oxygen threshold and the fourth dissolved oxygen threshold can be set by those skilled in the art according to actual needs.
In some embodiments, the first dissolved oxygen threshold is equal to the third dissolved oxygen threshold and the second dissolved oxygen threshold is equal to the fourth dissolved oxygen threshold.
In the above embodiment, the controller controls to increase the output frequency of the fan frequency converter under the condition that the second dissolved oxygen concentration value is less than the third dissolved oxygen threshold value, so as to increase the total aeration amount of the fan outlet, thereby increasing the air volume delivered to the biochemical tank; under the condition that the second dissolved oxygen concentration value is greater than the fourth dissolved oxygen threshold value, the output frequency of the fan frequency converter is controlled to be reduced, so that the total aeration quantity of the fan outlet is reduced, and the air quantity conveyed to the biochemical tank is reduced; and controlling the output frequency of the fan frequency converter to be unchanged under the condition that the second dissolved oxygen concentration value is greater than or equal to the third dissolved oxygen threshold value and the second dissolved oxygen concentration value is less than or equal to the fourth dissolved oxygen threshold value, so that the total aeration quantity of the fan outlet can be kept unchanged, and the air quantity conveyed to the biochemical tank is kept unchanged.
The working process of the air volume control system is described below by taking the first dissolved oxygen threshold and the third dissolved oxygen threshold as 4mg/L, and the second dissolved oxygen threshold and the fourth dissolved oxygen threshold as 5mg/L as an example.
During normal operation, the controller can receive the output signal (namely the first dissolved oxygen concentration value) of the first dissolved oxygen sensor and the valve opening degree feedback signal of the electric control valve in real time, and judge the output signal of the first dissolved oxygen sensor.
(1) When the first dissolved oxygen concentration value is lower than 4mg/L, the controller outputs a first control signal through the analog input/output module so as to increase the valve opening of the normally closed electric regulating valve, improve the air volume in the air supply pipeline (namely the first branch pipeline) of the regulating reservoir, and at the moment, the air supply volume of the biochemical reservoir can be reduced. The controller collects and judges an output signal (namely a second dissolved oxygen concentration value) of the second dissolved oxygen sensor, and when the second dissolved oxygen concentration value is lower than 4mg/L, the controller outputs a second control signal to the fan frequency converter so as to improve the output frequency of the currently operated fan frequency converter, increase the total aeration quantity of a fan outlet and increase the air quantity of the biochemical tank; if the second dissolved oxygen concentration value is higher than 5mg/L, the controller reduces the total aeration quantity of the fan outlet and reduces the air quantity of the biochemical tank by reducing the output frequency of the current running fan frequency converter; if the second dissolved oxygen concentration value is between 4 and 5mg/L, the output frequency of the frequency converter is kept unchanged, and stable air supply to the biochemical pool is ensured.
(2) When the first dissolved oxygen concentration value is higher than 5mg/L, the controller outputs a first control signal through the analog input/output module so as to reduce the valve opening of the normally closed electric regulating valve and reduce the air volume in the air supply pipeline of the regulating tank, and at the moment, the air supply volume of the biochemical tank is possibly increased. And then the controller collects the output signal of the second dissolved oxygen sensor and controls the flow path according to the air quantity of the biochemical pool to judge and control.
(3) When the first dissolved oxygen concentration value is between 4 and 5mg/L, the controller controls the valve opening of the electric regulating valve to be kept unchanged, and stable air supply to the regulating tank is guaranteed. And then the controller collects the output signal of the second dissolved oxygen sensor and controls the flow path according to the air quantity of the biochemical pool to judge and control.
Through the air volume control system, air supply according to requirements under the process requirements of the regulating tank and the biochemical tank can be realized, dissolved oxygen is subjected to fluctuation regulation in a proper interval, and the wastewater treatment capacity and efficiency of a wastewater station can be ensured.
In some embodiments, the controller 230 may be further configured to determine whether the fan can provide the predetermined wind pressure under the adjusted frequency operation after controlling to reduce the output frequency of the fan frequency converter, and if the fan can provide the predetermined wind pressure under the adjusted frequency operation, continue to control to reduce the output frequency of the fan frequency converter, otherwise, stop reducing the output frequency of the fan frequency converter. Therefore, the wind pressure can be ensured to reach the preset wind pressure in the adjusting and controlling process of reducing the output frequency of the fan frequency converter, so that the wind can be conveyed to the adjusting tank and the biochemical tank.
For example, the predetermined wind pressure may be in a range of 0.6bar to 0.7 bar. For example, the predetermined wind pressure may be 0.682 bar. Of course, those skilled in the art will appreciate that the numerical range of the predetermined wind pressure is merely exemplary, and the scope of the present disclosure is not limited thereto. The person skilled in the art can set the predetermined wind pressure according to the actual need.
In some embodiments, the air volume control system may further include a wind pressure detector for detecting a wind pressure value provided by the fan and transmitting the wind pressure value to the controller. The wind pressure detector may employ a wind pressure detecting apparatus known to those skilled in the art.
Fig. 4 is a schematic configuration diagram illustrating an air volume control system for a wastewater treatment plant according to further embodiments of the present disclosure.
As shown in fig. 4, the air volume control system 300 may further include a liquid level detector 240 in addition to the first dissolved oxygen sensor 210, the second dissolved oxygen sensor 220, and the controller 230. The level detector 240 is electrically connected (e.g., via ethernet) to the controller 230. As shown in FIG. 2, the level detector 240 is disposed within the conditioning tank 130. The level detector 240 is used to detect the level of liquid in the conditioning tank. Here, the liquid level is the height from the liquid level of the liquid to the bottom of the regulating reservoir.
The controller 230 may be further configured to control to close the valve of the electric control valve when the liquid level of the liquid in the regulating reservoir is less than the liquid level threshold, adjust the valve opening of the electric control valve according to the first dissolved oxygen concentration value and adjust the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value when the liquid level of the liquid in the regulating reservoir is greater than or equal to the liquid level threshold.
In this embodiment, when the liquid level of the liquid in the regulating reservoir is less than the liquid level threshold, no gas needs to be supplied to the regulating reservoir, so the controller controls to close the valve of the electric regulating valve, and when the liquid level of the liquid in the regulating reservoir is greater than or equal to the liquid level threshold, the above-mentioned control of the electric regulating valve and the fan frequency converter is performed.
In some embodiments, the liquid level threshold may range from 2 meters to 3 meters. Of course, those skilled in the art will appreciate that the values of the level thresholds are merely exemplary, and the scope of the present disclosure is not so limited. The skilled person can set the level threshold according to the actual need.
The working process of the air volume control system is illustrated below with 2 meters as the liquid level threshold.
When the regulating tank works normally, the controller receives a liquid level signal of the regulating tank in real time and judges, when the liquid level of the regulating tank is larger than or equal to 2 meters and air supply is needed, the controller outputs a first control signal through the analog input and output module to gradually and slowly open a valve of the normally closed electric regulating valve so as to supply air to the regulating tank, and collects a first dissolved oxygen concentration value output by a first dissolved oxygen sensor in the regulating tank and a valve opening feedback signal of the electric regulating valve, and processes and judges the first dissolved oxygen concentration value of the first dissolved oxygen sensor. Here, the controller may determine whether the valve opening of the electric control valve is changed in the subsequent adjustment by collecting a valve opening feedback signal of the electric control valve.
When the first dissolved oxygen concentration value is smaller than a first dissolved oxygen threshold value (for example, 4mg/L), the controller outputs a 4-20 mA analog quantity signal (as a first control signal) through the analog quantity input and output module so as to increase the valve opening of the electric regulating valve and improve the air volume in the air supply pipeline of the regulating reservoir. And the controller collects a second dissolved oxygen concentration value of a second dissolved oxygen sensor in the biochemical pool and carries out processing judgment. When the second dissolved oxygen concentration value is smaller than a third dissolved oxygen threshold value (for example, 4mg/L), the controller outputs a second control signal to the fan frequency converter to improve the output frequency of the currently operated fan frequency converter, so that the total aeration quantity of the fan outlet is increased, and the air quantity of the biochemical tank is increased. If the second dissolved oxygen concentration value is larger than a fourth dissolved oxygen threshold value (for example, 5mg/L), the controller outputs a second control signal to the fan frequency converter to reduce the output frequency of the currently operated fan frequency converter (for example, the fan provides at least a predetermined wind pressure (for example, 0.682bar) so as to expose the air), so that the total aeration quantity of the fan outlet is reduced, and the air quantity of the biochemical pool is reduced. And if the second dissolved oxygen concentration value is between the third dissolved oxygen threshold value and the fourth dissolved oxygen threshold value, maintaining the output frequency of the frequency converter unchanged, and ensuring stable air supply to the biochemical tank.
When the first dissolved oxygen concentration value is larger than a second dissolved oxygen threshold value (for example, 5mg/L), the controller outputs a first control signal through the analog input and output module so as to reduce the valve opening of the electric regulating valve and reduce the air volume in the air supply pipeline of the regulating reservoir. And then, the controller collects a second dissolved oxygen concentration value of a second dissolved oxygen sensor and controls the fan frequency converter according to the control flow.
When the first dissolved oxygen concentration value is between the first dissolved oxygen threshold value and the second dissolved oxygen threshold value, the controller keeps the output analog quantity signal for controlling the valve of the electric regulating valve unchanged, and stable air supply to the regulating tank is ensured. And then, the controller collects a second dissolved oxygen concentration value of a second dissolved oxygen sensor and controls the fan frequency converter according to the control flow.
And (II) the controller collects a liquid level signal of the regulating reservoir through the liquid level detector in real time to judge, and when the water level of the regulating reservoir is lower than 2 meters and does not need air supply, the controller outputs a valve opening analog quantity signal (a first control signal) of the electric regulating valve so as to close the valve of the electric regulating valve and stop supplying air to the regulating reservoir. And then, the controller collects a second dissolved oxygen concentration value of a second dissolved oxygen sensor and controls the fan frequency converter according to the control flow.
The air quantity control system realizes the fluctuation regulation of the dissolved oxygen of the regulating tank and the biochemical tank in a preset interval, ensures the processing capacity and the processing efficiency of biochemical aerobic bacteria in the biochemical tank, realizes air supply according to requirements of the regulating tank and the biochemical tank and achieves a certain energy-saving effect.
Fig. 5 is a flow chart illustrating an air volume control method for a wastewater treatment plant according to some embodiments of the present disclosure. The waste water treatment device comprises a fan, an air supply pipeline, an electric regulating valve, a regulating tank and a biochemical tank. The fan is configured to supply air to the conditioning tank and the biochemical tank through the air supply duct, respectively. The air supply pipeline comprises a first branch pipeline arranged between the fan and the adjusting tank and a second branch pipeline arranged between the fan and the biochemical tank. The electric control valve is arranged on the first branch pipeline. The fan includes the fan converter. As shown in fig. 5, the method includes steps S502 to S504.
In step S502, a first dissolved oxygen concentration value of the liquid in the conditioning tank and a second dissolved oxygen concentration value of the liquid in the biochemical tank are acquired.
In step S504, the valve opening of the electric control valve is adjusted according to the first dissolved oxygen concentration value, and the output frequency of the fan frequency converter is adjusted according to the second dissolved oxygen concentration value.
In some embodiments, the step of adjusting the valve opening of the electrically actuated regulator valve based on the first dissolved oxygen concentration value comprises: under the condition that the first dissolved oxygen concentration value is smaller than a first dissolved oxygen threshold value, controlling to increase the valve opening of the electric regulating valve; controlling to reduce the valve opening of the electric regulating valve under the condition that the first dissolved oxygen concentration value is greater than the second dissolved oxygen threshold value; and controlling the valve opening of the electric regulating valve to be unchanged under the condition that the first dissolved oxygen concentration value is greater than or equal to the first dissolved oxygen threshold value and the first dissolved oxygen concentration value is less than or equal to the second dissolved oxygen threshold value. The first dissolved oxygen threshold is less than the second dissolved oxygen threshold.
In some embodiments, the step of adjusting the output frequency of the fan inverter based on the second dissolved oxygen concentration value comprises: under the condition that the second dissolved oxygen concentration value is smaller than a third dissolved oxygen threshold value, controlling and increasing the output frequency of the fan frequency converter; under the condition that the second dissolved oxygen concentration value is larger than a fourth dissolved oxygen threshold value, controlling to reduce the output frequency of the fan frequency converter; and controlling the output frequency of the fan frequency converter to be unchanged under the condition that the second dissolved oxygen concentration value is greater than or equal to the third dissolved oxygen threshold value and the second dissolved oxygen concentration value is less than or equal to the fourth dissolved oxygen threshold value. The third dissolved oxygen threshold is less than the fourth dissolved oxygen threshold.
Thus, methods of air volume control according to some embodiments of the present disclosure are provided. The air volume control method comprises the following steps: acquiring a first dissolved oxygen concentration value of liquid in the regulating tank and a second dissolved oxygen concentration value of liquid in the biochemical tank; and adjusting the valve opening of the electric adjusting valve according to the first dissolved oxygen concentration value, and adjusting the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value. The air quantity control method can adjust the air quantity conveyed to the regulating tank and the biochemical tank, thereby meeting the air quantity process requirements of the biochemical tank and the regulating tank and ensuring the treatment efficiency of biochemical aerobic bacteria in the biochemical tank as much as possible.
In some embodiments, the air volume control method may further include: after controlling and reducing the output frequency of the frequency converter of the fan, judging whether the fan can provide preset air pressure under the operation of the adjusted frequency; if the fan can provide preset wind pressure under the operation of the adjusted frequency, continuing to control and reduce the output frequency of the fan frequency converter; otherwise, stopping reducing the output frequency of the fan frequency converter.
In some embodiments, the air volume control method further includes: acquiring the liquid level of liquid in the regulating reservoir; under the condition that the liquid level of the liquid in the regulating reservoir is less than the liquid level threshold value, controlling to close a valve of the electric regulating valve; and executing the step of adjusting the valve opening of the electric regulating valve and the output frequency of the fan frequency converter under the condition that the liquid level of the liquid in the regulating reservoir is greater than or equal to the liquid level threshold value.
Fig. 6 is a flowchart illustrating an air volume control method for a wastewater treatment plant according to further embodiments of the present disclosure. As shown in fig. 6, the method includes steps S602 to S624.
In step S602, the level of the liquid in the regulation tank is acquired.
In step S604, it is determined whether the liquid level of the liquid in the regulating reservoir is less than a liquid level threshold. If so, the process advances to step S606; otherwise, the process advances to step S608.
In step S606, control closes the valve of the electrically-operated regulator valve.
In step S608, a first dissolved oxygen concentration value of the liquid in the regulating reservoir is acquired.
In step S610, control increases the valve opening of the electrically-operated regulator valve when the first dissolved oxygen concentration value is less than the first dissolved oxygen threshold value.
In step S612, in a case where the first dissolved oxygen concentration value is greater than the second dissolved oxygen threshold value, control is performed to decrease the valve opening degree of the electric regulator valve.
In step S614, the valve opening degree of the electric control valve is controlled to be unchanged when the first dissolved oxygen concentration value is greater than or equal to the first dissolved oxygen threshold value and the first dissolved oxygen concentration value is less than or equal to the second dissolved oxygen threshold value.
In step S616, a second dissolved oxygen concentration value of the liquid in the biochemical pool is obtained.
In step S618, in a case that the second dissolved oxygen concentration value is smaller than the third dissolved oxygen threshold value, controlling to increase the output frequency of the fan frequency converter.
In step S620, in the case that the second dissolved oxygen concentration value is greater than the fourth dissolved oxygen threshold value, controlling to reduce the output frequency of the fan frequency converter.
In step S622, the output frequency of the fan frequency converter is controlled to be unchanged when the second dissolved oxygen concentration value is greater than or equal to the third dissolved oxygen threshold value and the second dissolved oxygen concentration value is less than or equal to the fourth dissolved oxygen threshold value.
In step S624, it is determined whether the fan can provide a predetermined wind pressure under the adjusted frequency operation. If so, the process returns to step S620; otherwise, the process ends.
Thus, methods of air volume control according to other embodiments of the present disclosure are provided. The method realizes the fluctuation regulation of the dissolved oxygen in the regulating tank and the biochemical tank in a preset interval, ensures the processing capacity and the processing efficiency of biochemical aerobic bacteria in the biochemical tank, realizes air supply according to requirements of the regulating tank and the biochemical tank, and achieves a certain energy-saving effect.
Fig. 7 is a schematic diagram illustrating a structure of a controller according to some embodiments of the present disclosure. The controller includes a memory 710 and a processor 720. Wherein: the memory 710 may be a magnetic disk, flash memory, or any other non-volatile storage medium. The memory is used for storing the instructions in the embodiments corresponding to fig. 5 and/or fig. 6.
In other embodiments, as also shown in FIG. 8, the controller 800 includes a memory 810 and a processor 820. The processor 820 is coupled to the memory 810 by a BUS 830. Controller 800 may also be coupled to external storage 850 via storage interface 840 to facilitate retrieval of external data, and may also be coupled to a network or another computer system (not shown) via network interface 860, which will not be described in detail herein.
In the embodiment, the data instructions are stored in the memory, and the instructions are processed by the processor, so that the air quantity conveyed to the regulating tank and the biochemical tank can be regulated, the air quantity process requirements of the biochemical tank and the regulating tank are met, and the treatment efficiency of biochemical aerobic bacteria in the biochemical tank is ensured as much as possible.
In other embodiments, the present disclosure also provides a non-transitory computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps of the method in the embodiments corresponding to fig. 5 and/or fig. 6. As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (12)
1. An air volume control system for a wastewater treatment device, wherein the wastewater treatment device comprises a fan, an air supply pipeline, an electric control valve, a regulating reservoir and a biochemical reservoir, the fan is configured to supply air to the regulating reservoir and the biochemical reservoir through the air supply pipeline respectively, the air supply pipeline comprises a first branch pipeline arranged between the fan and the regulating reservoir and a second branch pipeline arranged between the fan and the biochemical reservoir, the electric control valve is arranged on the first branch pipeline, and the fan comprises a fan frequency converter;
the air volume control system includes:
a first dissolved oxygen sensor disposed within the conditioning tank for measuring a first dissolved oxygen concentration value of the liquid in the conditioning tank;
the second dissolved oxygen sensor is arranged in the biochemical pool and used for measuring a second dissolved oxygen concentration value of the liquid in the biochemical pool; and
and the controller is used for adjusting the valve opening of the electric regulating valve according to the first dissolved oxygen concentration value and adjusting the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value.
2. The air volume control system according to claim 1,
the controller is used for controlling the valve opening of the electric control valve to be increased when the first dissolved oxygen concentration value is smaller than a first dissolved oxygen threshold value, controlling the valve opening of the electric control valve to be decreased when the first dissolved oxygen concentration value is larger than a second dissolved oxygen threshold value, and controlling the valve opening of the electric control valve to be unchanged when the first dissolved oxygen concentration value is larger than or equal to the first dissolved oxygen threshold value and the first dissolved oxygen concentration value is smaller than or equal to the second dissolved oxygen threshold value, wherein the first dissolved oxygen threshold value is smaller than the second dissolved oxygen threshold value.
3. The air volume control system according to claim 1 or 2, wherein,
the controller is used for controlling the output frequency of the fan frequency converter to be increased under the condition that the second dissolved oxygen concentration value is smaller than a third dissolved oxygen threshold value, controlling the output frequency of the fan frequency converter to be decreased under the condition that the second dissolved oxygen concentration value is larger than a fourth dissolved oxygen threshold value, and controlling the output frequency of the fan frequency converter to be unchanged under the conditions that the second dissolved oxygen concentration value is larger than or equal to the third dissolved oxygen threshold value and the second dissolved oxygen concentration value is smaller than or equal to the fourth dissolved oxygen threshold value, wherein the third dissolved oxygen threshold value is smaller than the fourth dissolved oxygen threshold value.
4. The air volume control system according to claim 3, wherein,
the controller is further used for judging whether the fan can provide preset wind pressure under the adjusted frequency operation after controlling and reducing the output frequency of the fan frequency converter, if the fan can provide the preset wind pressure under the adjusted frequency operation, continuing to control and reduce the output frequency of the fan frequency converter, and if not, stopping reducing the output frequency of the fan frequency converter.
5. The air volume control system according to claim 1, further comprising:
the liquid level detector is arranged in the regulating reservoir and is used for detecting the liquid level of the liquid in the regulating reservoir;
the controller is further used for controlling to close a valve of the electric regulating valve under the condition that the liquid level of the liquid in the regulating reservoir is smaller than a liquid level threshold value, and regulating the valve opening of the electric regulating valve according to the first dissolved oxygen concentration value and regulating the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value under the condition that the liquid level of the liquid in the regulating reservoir is larger than or equal to the liquid level threshold value.
6. An air volume control method for a wastewater treatment device, wherein the wastewater treatment device comprises a fan, an air supply pipeline, an electric control valve, a regulating reservoir and a biochemical reservoir, the fan is configured to supply air to the regulating reservoir and the biochemical reservoir through the air supply pipeline respectively, the air supply pipeline comprises a first branch pipeline arranged between the fan and the regulating reservoir and a second branch pipeline arranged between the fan and the biochemical reservoir, the electric control valve is arranged on the first branch pipeline, and the fan comprises a fan frequency converter;
the air volume control method comprises the following steps:
acquiring a first dissolved oxygen concentration value of the liquid in the regulating tank and a second dissolved oxygen concentration value of the liquid in the biochemical tank; and
and adjusting the valve opening of the electric adjusting valve according to the first dissolved oxygen concentration value, and adjusting the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value.
7. The air volume control method according to claim 6, wherein the step of adjusting the valve opening degree of the electrically-operated regulator valve in accordance with the first dissolved oxygen concentration value includes:
controlling to increase the valve opening of the electric control valve under the condition that the first dissolved oxygen concentration value is smaller than a first dissolved oxygen threshold value;
controlling to reduce the valve opening of the electric control valve under the condition that the first dissolved oxygen concentration value is greater than a second dissolved oxygen threshold value; and
controlling the valve opening of the electric control valve to be unchanged under the condition that the first dissolved oxygen concentration value is greater than or equal to the first dissolved oxygen threshold value and the first dissolved oxygen concentration value is less than or equal to the second dissolved oxygen threshold value;
wherein the first dissolved oxygen threshold is less than the second dissolved oxygen threshold.
8. The air volume control method according to claim 6 or 7, wherein the step of adjusting the output frequency of the fan frequency converter according to the second dissolved oxygen concentration value comprises:
under the condition that the second dissolved oxygen concentration value is smaller than a third dissolved oxygen threshold value, controlling to increase the output frequency of the fan frequency converter;
under the condition that the second dissolved oxygen concentration value is larger than a fourth dissolved oxygen threshold value, controlling to reduce the output frequency of the fan frequency converter; and
controlling the output frequency of the fan frequency converter to be unchanged under the condition that the second dissolved oxygen concentration value is greater than or equal to the third dissolved oxygen threshold value and the second dissolved oxygen concentration value is less than or equal to the fourth dissolved oxygen threshold value;
wherein the third dissolved oxygen threshold is less than the fourth dissolved oxygen threshold.
9. The air volume control method according to claim 8, further comprising:
after controlling and reducing the output frequency of the fan frequency converter, judging whether the fan can provide preset wind pressure under the operation of the adjusted frequency;
if the fan can provide the preset wind pressure under the operation of the adjusted frequency, continuing to control and reduce the output frequency of the fan frequency converter; otherwise, stopping reducing the output frequency of the fan frequency converter.
10. The air volume control method according to claim 1, further comprising:
acquiring the liquid level of the liquid in the regulating reservoir;
controlling to close a valve of the electric regulating valve under the condition that the liquid level of the liquid in the regulating reservoir is less than a liquid level threshold value; and
and under the condition that the liquid level of the liquid in the regulating reservoir is greater than or equal to the liquid level threshold value, executing the step of regulating the valve opening of the electric regulating valve and the output frequency of the fan frequency converter.
11. A controller, comprising:
a memory; and
a processor coupled to the memory, the processor configured to perform the method of any of claims 6 to 10 based on instructions stored in the memory.
12. A non-transitory computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the method of any one of claims 6 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643125.6A CN113342070A (en) | 2021-06-09 | 2021-06-09 | Air volume control system, method, controller and computer readable storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110643125.6A CN113342070A (en) | 2021-06-09 | 2021-06-09 | Air volume control system, method, controller and computer readable storage medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113342070A true CN113342070A (en) | 2021-09-03 |
Family
ID=77475831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110643125.6A Pending CN113342070A (en) | 2021-06-09 | 2021-06-09 | Air volume control system, method, controller and computer readable storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113342070A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314820A (en) * | 2022-01-07 | 2022-04-12 | 龙岩烟草工业有限责任公司 | Air supply control system, method and device for wastewater station |
-
2021
- 2021-06-09 CN CN202110643125.6A patent/CN113342070A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114314820A (en) * | 2022-01-07 | 2022-04-12 | 龙岩烟草工业有限责任公司 | Air supply control system, method and device for wastewater station |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100506720C (en) | Urban sewage plant aeration tank dissolved oxygen stable intelligent control method and device | |
| CN104090488B (en) | The method that sewage plant controls dissolved oxygen, sludge loading and sludge age in real time automatically | |
| KR101729932B1 (en) | Realtime water treatment control system using ORP and pH | |
| CN107986428B (en) | Sewage treatment accurate aeration method | |
| CN202758178U (en) | Intelligent dynamic aeration control system | |
| CN209583779U (en) | A kind of sewage treatment accurate aeration system | |
| CN106277299B (en) | Aeration control system and method based on oxygen consumption rate tester | |
| CN113342070A (en) | Air volume control system, method, controller and computer readable storage medium | |
| CN113213646A (en) | Blower control device and control method for sewage treatment system | |
| US11597667B2 (en) | Wastewater treatment system, air supply amount control device, and air supply amount control method | |
| JP6655975B2 (en) | Aeration control device and aeration control method | |
| JP5331735B2 (en) | Waste water treatment apparatus and oxygen supply amount control method thereof | |
| KR20060092660A (en) | Automatic control device and method for wastewater treatment using fuzzy control | |
| CN110436609A (en) | A kind of Intellectualized sewage water processing aeration control method with self-learning function | |
| CN202625944U (en) | Energy-saving variable-frequency regulating accurate aerating system | |
| CN102491507A (en) | Method and device of automatic control for sequencing batch type treatment process at non-DO state | |
| CN206232477U (en) | A kind of dissolved oxygen automatic control system | |
| CN115583721A (en) | AI intelligent aeration method and system based on sewage treatment | |
| CN214174904U (en) | Intelligent aeration quantity calculation control system for sewage treatment | |
| CN113651413A (en) | Ozone adding control method and system based on antibiotic on-line monitoring | |
| CN109534493B (en) | Sewage treatment aeration precise control system and control method thereof | |
| CN211813677U (en) | Sewage biochemical treatment system | |
| JP2018187620A (en) | Operation support apparatus and operation support method for sewage treatment plant using activated sludge method | |
| CN202358957U (en) | Automatic control device for sequencing batch processing process in non-DO state | |
| JP2009165959A (en) | Treatment state judging method of aeration tank and wastewater treatment control system using it |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210903 |
|
| RJ01 | Rejection of invention patent application after publication |