CN115124153A - Accurate aeration control system for sewage plant - Google Patents
Accurate aeration control system for sewage plant Download PDFInfo
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- CN115124153A CN115124153A CN202210785982.4A CN202210785982A CN115124153A CN 115124153 A CN115124153 A CN 115124153A CN 202210785982 A CN202210785982 A CN 202210785982A CN 115124153 A CN115124153 A CN 115124153A
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- 238000005273 aeration Methods 0.000 title claims abstract description 56
- 239000010865 sewage Substances 0.000 title claims abstract description 36
- 230000001105 regulatory effect Effects 0.000 claims abstract description 25
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 19
- 239000010432 diamond Substances 0.000 claims abstract description 19
- 238000005457 optimization Methods 0.000 claims abstract description 10
- 238000012795 verification Methods 0.000 claims abstract description 8
- 238000005276 aerator Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 15
- 239000007789 gas Substances 0.000 abstract description 15
- 239000001301 oxygen Substances 0.000 abstract description 15
- 229910052760 oxygen Inorganic materials 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 5
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- 230000001276 controlling effect Effects 0.000 abstract description 2
- 230000010354 integration Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000005259 measurement Methods 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
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- 230000003068 static effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
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- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention belongs to the technical field of matched systems of sewage plants, and particularly relates to an accurate aeration control system for a sewage plant. The system comprises an on-site control unit and an on-site control system, wherein the on-site control unit comprises an on-site control cabinet, an air pipeline, an electric diamond air regulating valve, a thermal gas flowmeter, a DO (DO) tester, a switch valve and a blower, and the on-site control system comprises an aeration on-site control system, a blower pressure optimization control system and system integration calibration and verification. The invention has the following advantages: firstly, the control system has the most basic function of controlling the air intake quantity of each sewage treatment area, ensures the stable control of dissolved oxygen and meets the control requirement of the operation of a sewage treatment process on the dissolved oxygen; secondly, the control system collects an air flow signal, a valve position signal and an air pipeline pressure signal, and finally sets an optimized reference value for the running pressure of the air blower, so that the linkage adjustment, energy conservation and consumption reduction of the air blower are realized.
Description
Technical Field
The invention belongs to the technical field of matched systems of sewage plants, and particularly relates to an accurate aeration control system for a sewage plant.
Background
The aeration system refers to a relatively independent complete subsystem matched with a sewage treatment system in a sewage treatment plant. The aeration system needs to accurately control the air input of each sewage treatment area, and the final purposes are two: firstly, ensuring the dissolved oxygen content in each sewage treatment area to be appropriate and stable; secondly, optimizing the running mode of the air blower, and finally saving energy and increasing efficiency.
The existing aeration link control system of a sewage plant, such as Chinese patent with patent publication No. CN114314823A and publication No. 2022.04.12, discloses a dissolved oxygen control system and method in an aeration link.
In the control system and the method, a first water quality sensor group measures water quality parameters of sewage in an aeration tank, a mud sensor measures sludge concentration of the sewage in the aeration tank, an air gauge of an air blower measures the blast volume of the air blower, two second water quality sensor groups measure water quality parameters of the sewage at a water inlet and a water outlet respectively, a control system of an air blower room inputs the parameters into an activated sludge model No. 1, an initial value of dissolved oxygen in the aeration tank is output, a dissolved oxygen concentration active disturbance rejection controller in an aeration link is used for calculating a dissolved oxygen concentration regulating value of the aeration tank in the current state, finally, a set value of running power of the air blower is obtained by adopting a constructed blast power prediction model, and the blast volume of the air blower is regulated according to the set value of the running power of the air blower, so that the control of the dissolved oxygen concentration of the aeration tank is realized.
However, the dissolved oxygen control system and method in the aeration link in the patent of the invention have at least the following 2 disadvantages in the actual operation process of a sewage plant.
Firstly, the signal acquisition mode of the front end of the control system is not reasonable enough, so that the system has higher dependence degree on an online instrument and insufficient safety.
Secondly, the detection data cannot be finally fed back to the optimization operation of the aeration equipment, and only control is carried out without an optimization idea.
Therefore, in view of the above, there is an urgent need for a novel aeration control system with more direct and accurate air input control and more convenient blower optimization.
Disclosure of Invention
The invention provides an accurate aeration control system for a sewage plant, which comprises an on-site control unit and an on-site control system, wherein the on-site control unit comprises an on-site control cabinet, an air pipeline, an electric diamond air regulating valve, a thermal gas flowmeter, a DO (DO) tester, a switch valve and a blower, and the on-site control system comprises an aeration on-site control system, a blower pressure optimization control system and system integration calibration and verification.
The technical scheme adopted by the invention for solving the problems is as follows: an accurate aeration control system for sewage plant, which comprises an on-site control unit and an on-site control system,
the local control unit comprises a local control cabinet, an air pipeline, an electric diamond air regulating valve, a thermal gas flowmeter, a DO tester, a switch valve and a blower,
the on-site control system comprises an aeration on-site control system, a blower pressure optimization control system and system integrated calibration and verification,
the on-site control system collects signals from the on-site control unit including valve position signals, air flow signals, air duct pressure signals, and DO value.
The further preferred technical scheme is as follows: the on-the-spot control unit sets up on aerobic zone and SBR pond, and 2 SBR ponds are connected to 1 AAO pond rear end, and single SBR pond includes 2 SBR districts, SBR district is including taking the front end region of air condition function to and the rear end region that the aeration was normally opened.
The further preferred technical scheme is as follows: the air conduit is equipped with in the boundary department in 2 SBR districts the ooff valve, the boundary department in front end region and rear end region is equipped with electronic rhombus air control valve, the DO apparatus setting is in the front end region.
The further preferred technical scheme is as follows: and an aeration pipeline is arranged on the air pipeline.
The further preferred technical scheme is as follows: the air pipeline is provided with a straight pipe section with a relatively small pipe diameter and 2 gradually-reduced pipe sections respectively positioned on two sides of the straight pipe section, and the thermal gas flowmeter and the electric rhombic air regulating valve are arranged on the straight pipe section.
The further preferred technical scheme is as follows: the DN of the air pipeline is 450mm, the DN of the straight pipe section is 300mm, the DN of the aeration pipeline is 200mm, and the disc-type aerator is arranged on the aeration pipeline.
The further preferred technical scheme is as follows: the electric diamond air regulating valve, the thermal gas flowmeter, the DO tester, the switch valve and the air blower are all connected with the field control system through PLC signals, and an MCP control cabinet is further arranged between the air blower and the field control system.
The further preferred technical scheme is as follows: the field control system is arranged in the control cabinet, and the control cabinet has remote display and control functions.
The further preferred technical scheme is as follows: the electric rhombic air regulating valve and the thermal gas flowmeter are integrally designed and integrally calibrated.
The further preferred technical scheme is as follows: the system integrated calibration and verification content comprises a DO set value, an air pipeline pressure suggested value and a +/-0.3 deviation line of the DO set value.
The present invention has the following advantages.
Firstly, the control system has the most basic function of controlling the air intake amount of each sewage treatment area, ensures the stable control of the dissolved oxygen and meets the control requirement of the operation of the sewage treatment process on the dissolved oxygen.
Secondly, the control system collects an air flow signal, a valve position signal and an air pipeline pressure signal, and finally sets an optimized reference value for the running pressure of the air blower, so that the linkage adjustment, energy conservation and consumption reduction of the air blower are realized.
Thirdly, the control system adopts the air flow as a main control signal, adopts a dissolved oxygen signal as an auxiliary control signal, simultaneously couples an air pipeline pressure signal, combines the change of the actual water inlet load of the sewage plant and the requirement of the dissolved oxygen operation level of each control unit, timely and accurately distributes and controls the air input so as to meet the requirement of stable control of the dissolved oxygen and realize the efficient and economic operation of the air blower, and furthest reduces the degree of dependence on an online instrument.
Fourthly, the electric rhombic air regulating valve, the thermal type gas flowmeter, the air blower and the like are matched with a field control system to accumulate a large amount of experimental data, a scientific mathematical model is established, the matching performance and the measurement and control precision of system components are guaranteed, and the overall measurement and control precision is better than 3% after the system is simulated and calibrated.
Drawings
FIG. 1 is a plan view (single side) of an aeration control system according to the present invention.
Fig. 2 is a schematic diagram of the position structure of the electric diamond air regulating valve and the thermal gas flowmeter in the invention.
FIG. 3 is a schematic diagram showing the fluctuation range of a control parameter for dissolved oxygen control and blower power saving in an embodiment of the present invention. In the figure, the real-time efficient control of the valve position finally enables the pipeline pressure to be always stabilized around the recommended value of the air pipeline pressure, and the D0 is also always stabilized within the deviation range of +/-0.3 of the DO set value.
In the figures, the symbols represent the following meanings: an air pipeline b, an electric diamond air adjusting valve c, a thermal gas flowmeter d, a DO determinator e, a switch valve f, a blower g, an SBR tank 2, an AAO tank 1, an SBR zone 2a, a front end zone 2a1, a rear end zone 2a2, an aeration pipeline h, a straight pipe section b1 and a tapered pipe section b 2.
Detailed Description
The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.
As shown in the attached figures 1-3, the precise aeration control system for the sewage plant comprises an on-site control unit and an on-site control system,
the local control unit comprises a local control cabinet, an air pipeline b, an electric diamond air regulating valve c, a thermal gas flowmeter d, a DO tester e, a switch valve f and a blower g,
the on-site control system comprises an aeration on-site control system, a blower pressure optimization control system and system integrated calibration and verification,
the on-site control system collects signals from the on-site control unit including valve position signals, air flow signals, air duct pressure signals, and DO value.
In this embodiment, the number of the local control cabinets is 1, and the electric diamond air regulating valve c, the thermal gas flowmeter d, the DO tester e and the blower g are 4.
The nominal pressure of the air pipeline b is PN10, and the environment temperature of the control system is-20-60 ℃.
In this embodiment, the project backgrounds of the control system are: the design scale of the three-stage project of the sewage treatment plant in Anji North City is 6 ten thousand meters 3 And d, the biochemical section is designed by adopting an AAO + SBR process, 2 biological reaction tanks are arranged in total, the single-group treatment capacity is 3 ten thousand tons per day, the aerator adopts a disc type aerator, the water depth is about 6 m, and the aeration branch trunk pipe of the biological reaction tank is DN 450.
The aeration section of the biological pond is provided with 5 air suspension fans and 4 devices, wherein the total number of the devices is 1, and the flow rate of each device is 4500Nm 3 The individual power was about 187KW and the blower back pressure was 784 mbar.
The on-site control unit sets up on aerobic zone and SBR pond 2, and 2 SBR ponds 2 are connected to 1 rear end in 1 AAO pond, and single SBR pond 2 includes 2 SBR districts 2a, SBR district is including taking air conditioning function's front end region 2a1 to and the normally open rear end region 2a2 of aeration.
In this embodiment, the aerobic zone and the SBR tank 2 are plug-flow aeration tanks, and the direction of the arrow in the attached figure 1 is the water flow direction.
The air pipeline is provided with the switch valve f at the boundary of 2 SBR areas, the electric diamond air regulating valve c is arranged at the boundary of the front end area 2a1 and the rear end area 2a2, and the DO tester e is arranged at the front end area 2a 1.
And an aeration pipeline h is arranged on the air pipeline b.
The air pipeline b is provided with a straight pipe section b1 with a relatively small pipe diameter and 2 tapered pipe sections b2 respectively positioned on two sides of the straight pipe section b1, and the thermal gas flowmeter d and the electric diamond air regulating valve c are arranged on the straight pipe section b 1.
In this embodiment, the electric diamond air regulating valve c is a linear regulating valve, and is linearly regulated in the regulation range of 0-100%, and the regulation characteristic curve table includes, but is not limited to, the following parameters: static pressure, dynamic pressure, minimum flow, normal flow, maximum flow, pressure loss, 0-100% opening, noise level, amplification factor, valve regulation characteristic and actual working characteristic full-range regulation range.
In addition, the repeatability precision and the stepping precision of the valve are better than 0.3%, the valve is sealed by PTFE, high-temperature resistant and corrosion resistant, zero leakage is realized during closing, the high flow capacity of the design working condition is met by the valve for ensuring the safety and the stability of the blast aeration system, and the pressure loss of the valve during flow design is less than or equal to 10 mbar.
Finally, the electric actuator matched with the electric diamond air regulating valve c adopts an original imported product of an international well-known import brand, the brand adopts German Eurma AUMA, the model is SAR AC, and the electric actuator is an intelligent adjusting electric actuator and a power supply: 380V, AC and 50Hz, shell material: cast iron or cast aluminum, have good dustproof, waterproof performance, protection level: IP 68.
The electric actuator is provided with a hand wheel and a hand/electric switching mechanism which are arranged on the side, when the electric operation is disconnected, no matter the motor rotates or is static, the electric actuator can be safely switched to the hand wheel operation through the hand/electric switching mechanism; the electric actuating mechanism is provided with a local operating button, a local and remote change-over switch and a remote opening degree display, and all control components are arranged in an integrated control unit of the opening and closing device.
And 4-20mA valve position state signal of each motor.
The electric actuating mechanism can receive a control signal provided by the PLC system or the precise aeration system to control the opening and closing of the valve.
The DN of the air pipeline b is 450mm, the DN of the straight pipe section b1 is 300mm, the DN of the aeration pipeline h is 200mm, and the disc-type aerator is arranged on the aeration pipeline h.
The electric diamond air regulating valve c, the thermal gas flowmeter d, the DO tester e, the switch valve f and the air blower g are connected with the field control system through PLC signals, and an MCP control cabinet is further arranged between the air blower g and the field control system.
The field control system is arranged in the control cabinet, and the control cabinet has remote display and control functions.
The electric diamond air regulating valve c and the thermal gas flowmeter d are integrally designed and integrally calibrated.
In this embodiment, the thermal gas flowmeter d is in the form of a sensor-transmitter integrated type, the sensor is installed in an insertion manner, the sensor is made of stainless steel 1.4571, and a probe rod in the sensor are integrally processed from a bar material, are free of welding and are corrosion-resistant.
After simulation calibration, the measurement precision of the flowmeter is as follows: less than or equal to 2 percent; repeatability: less than or equal to 0.5 percent; temperature of the medium: 60 ℃ to 130 ℃; ambient temperature: -20 ℃ to 60 ℃; protection grade: IP 68; a power supply: 24 VDC; insulating signal output, 4-20mA, active, load less than 400Ohm, 8bit resolution; outputting the pulse; installing an accessory: the stainless steel welding short pipe and the manual ball valve are matched.
The system integrates the calibration and verification contents including a DO set value, an air pipeline pressure suggested value and a +/-0.3 deviation line of the DO set value.
In this embodiment, the optimization control can display the relevant parameters in the system in the sewage treatment process in real time, so as to facilitate analysis according to the online data, including but not limited to the following relevant necessary information: date, time, name, flow, valve position, manifold pressure, blower on-off status, blower real-time current, DO measurement, DO set point, intermittent zone on-off status, etc.
The optimization control provides a reasonable air supply scheme for the aerobic aeration control area, the DO control concentrations of different control areas in the aeration tank are optimized, and the aims of energy conservation and consumption reduction are further fulfilled on the basis that the effluent reaches the standard. Meanwhile, the operation state of the system can be mastered in real time so as to flexibly adjust the control parameters, an optimal control scheme is formed, and powerful decision support is provided for operation management of a sewage plant.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various modifications can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. These are non-inventive modifications that fall within the scope of the claims of the present invention, which are protected by the patent statutes.
Claims (10)
1. The utility model provides an accurate aeration control system is used in sewage plant which characterized in that: comprises an on-site control unit and an on-site control system,
the local control unit comprises a local control cabinet, an air pipeline (b), an electric diamond air regulating valve (c), a thermal gas flowmeter (d), a DO tester (e), a switch valve (f) and a blower (g),
the on-site control system comprises an aeration on-site control system, a blower pressure optimization control system and system integrated calibration and verification,
the on-site control system collects signals from the on-site control unit including valve position signals, air flow signals, air duct pressure signals, and DO value.
2. The accurate aeration control system for sewage plant according to claim 1, wherein: the on-site control unit sets up on aerobic zone and SBR pond (2), and 2 SBR ponds (2) are connected to 1 AAO pond (1) rear end, and single SBR pond (2) include 2 SBR districts (2 a), SBR district is including taking air condition function's front end region (2 a 1) to and aeration normally open's rear end region (2 a 2).
3. The accurate aeration control system for sewage plant according to claim 2, characterized in that: the air pipeline is provided with the switch valve (f) at the boundary of 2 SBR zones, the electric diamond air regulating valve (c) is arranged at the boundary of the front end zone (2 a 1) and the rear end zone (2 a 2), and the DO measuring instrument (e) is arranged at the front end zone (2 a 1).
4. The accurate aeration control system for sewage plant according to claim 1, wherein: and an aeration pipeline (h) is arranged on the air pipeline (b).
5. The accurate aeration control system for sewage plant according to claim 4, characterized in that: the hot type gas flowmeter is characterized in that a straight pipe section (b 1) with a relatively small pipe diameter and 2 tapered pipe sections (b 2) respectively located on two sides of the straight pipe section (b 1) are arranged on the air pipeline (b), and the hot type gas flowmeter (d) and the electric diamond air regulating valve (c) are arranged on the straight pipe section (b 1).
6. The accurate aeration control system for sewage plant according to claim 4, characterized in that: the DN of the air pipeline (b) is 450mm, the DN of the straight pipe section (b 1) is 300mm, the DN of the aeration pipeline (h) is 200mm, and the disc-type aerator is arranged on the aeration pipeline (h).
7. The precise aeration control system for sewage plants according to claim 1, wherein: the electric diamond air regulating valve (c), the thermal gas flowmeter (d), the DO tester (e), the switch valve (f) and the air blower (g) are connected with the field control system through PLC signals, and an MCP control cabinet is further arranged between the air blower (g) and the field control system.
8. The precise aeration control system for sewage plants according to claim 1, wherein: the field control system is arranged in the control cabinet, and the control cabinet has remote display and control functions.
9. The accurate aeration control system for sewage plant according to claim 1, wherein: the electric diamond air regulating valve (c) and the thermal gas flowmeter (d) are integrally designed and integrally calibrated.
10. The accurate aeration control system for sewage plant according to claim 1, wherein: the system integrates the calibration and verification contents including a DO set value, an air pipeline pressure suggested value and a +/-0.3 deviation line of the DO set value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210785982.4A CN115124153A (en) | 2022-07-06 | 2022-07-06 | Accurate aeration control system for sewage plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210785982.4A CN115124153A (en) | 2022-07-06 | 2022-07-06 | Accurate aeration control system for sewage plant |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003340251A (en) * | 2002-05-30 | 2003-12-02 | Ryosaku Fujisato | Gas dissolving device and water treating device provided with the same, or the like |
| CN107416991A (en) * | 2017-06-16 | 2017-12-01 | 河南东晟环保科技股份有限公司 | A kind of intelligent accurate aeration control system |
| CN207608388U (en) * | 2017-12-05 | 2018-07-13 | 四川长河阳光建设工程有限公司 | A kind of accurate aeration system |
| CN109928493A (en) * | 2019-02-25 | 2019-06-25 | 北控水务(中国)投资有限公司 | It is a kind of that method is controlled to adjust based on the accurate dissolved oxygen of big data and evolution algorithm |
| CN209583779U (en) * | 2018-12-28 | 2019-11-05 | 中原环保股份有限公司 | A kind of sewage treatment accurate aeration system |
| CN114314823A (en) * | 2022-02-09 | 2022-04-12 | 南开大学 | Dissolved oxygen control system and method in aeration link |
-
2022
- 2022-07-06 CN CN202210785982.4A patent/CN115124153A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003340251A (en) * | 2002-05-30 | 2003-12-02 | Ryosaku Fujisato | Gas dissolving device and water treating device provided with the same, or the like |
| CN107416991A (en) * | 2017-06-16 | 2017-12-01 | 河南东晟环保科技股份有限公司 | A kind of intelligent accurate aeration control system |
| CN207608388U (en) * | 2017-12-05 | 2018-07-13 | 四川长河阳光建设工程有限公司 | A kind of accurate aeration system |
| CN209583779U (en) * | 2018-12-28 | 2019-11-05 | 中原环保股份有限公司 | A kind of sewage treatment accurate aeration system |
| CN109928493A (en) * | 2019-02-25 | 2019-06-25 | 北控水务(中国)投资有限公司 | It is a kind of that method is controlled to adjust based on the accurate dissolved oxygen of big data and evolution algorithm |
| CN114314823A (en) * | 2022-02-09 | 2022-04-12 | 南开大学 | Dissolved oxygen control system and method in aeration link |
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