CN109205808A - A kind of accurate aeration control method based on water outlet ammonia nitrogen and dissolved oxygen - Google Patents
A kind of accurate aeration control method based on water outlet ammonia nitrogen and dissolved oxygen Download PDFInfo
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- CN109205808A CN109205808A CN201811181907.7A CN201811181907A CN109205808A CN 109205808 A CN109205808 A CN 109205808A CN 201811181907 A CN201811181907 A CN 201811181907A CN 109205808 A CN109205808 A CN 109205808A
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- ammonia nitrogen
- dissolved oxygen
- concentration
- set point
- air blower
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention discloses a kind of accurate aeration control methods based on water outlet ammonia nitrogen and dissolved oxygen, including biochemical reaction tank, ammonia nitrogen in-line analyzer, dissolved oxygen in-line analyzer, host computer and air blower, the ammonia nitrogen in-line analyzer and the dissolved oxygen in-line analyzer are arranged at the water outlet of the biochemical reaction tank, the ammonia nitrogen in-line analyzer and the dissolved oxygen in-line analyzer are connected with the host computer of Central Control Room, line traffic control platform is provided in the host computer, the air blower is mounted on aerator, the connection of the host computer of the air blower and Central Control Room；It by acquiring water outlet ammonia nitrogen and dissolved oxygen concentration data in real time, is compared with setting value, adjusts aeration quantity in real time, it can avoided being aerated excessive, energy-saving, and can guarantee standard water discharge to greatest extent, guarantee stabilization, the reliability service of biochemical treatment system.
Description
Technical field
The present invention relates to technical field of sewage, more particularly to are thoroughly mixed formula sewage treatment process, such as oxidation ditch
Accurate aeration control.
Background technique
With social productive forces, economy, industrial expansion, more and more waste water is produced, sanitary sewage need to be collected to dirt
Water treatment plant's centralized processing, sewage qualified discharge after processing maintain the dynamic circulation of water environment cleaning.Sewage generally requires
By pipe network collection → grid filtration → pumping plant promotion → sand setting processing → biochemical treatment → sedimentation basin mud-water separation → row up to standard
It puts, partially needing can qualified discharge by advanced treating.Sewage treatment plant is energy-intensive industries, is energy consumption rich and influential family, and
And it is increasingly strict with sewage drainage standard, energy consumption also can be increased accordingly.The energy consumption of sewage treatment plant about 50%~80% occurs
In blast aeration process, therefore optimizing aeration control mode is key point that is energy-saving, ensureing water quality.
Tradition is limited to the manually control to aeration time to the control mode of technical process, while using fixed-frequency control air blast
Machine is aerated offering oxygen way, i.e., the air blower operating frequency in aeration time period is fixed.This mode has significant limitations, is unable to ensure
It is horizontal to react the DO that microorganism is suitable in cell system, inhibits the growth of heterotroph, nitrifier if being aerated deficiency；If aeration is excessive
It then causes unnecessary energy consumption to waste, and influences sludge flocculation structure and synchronous nitration and denitrification (SND) function and effect, to drop
Low denitrification effect.With the increasingly raising of sewage drainage standard, the raising that especially control of nitrogen phosphorus is required, this kind of traditional control
Mode has been extremely difficult to the requirement of discharge standard.
With the development of automatic instrument, also gradually development is to be dissolved with aerobic zone to the aeration process link of most of sewage plants
Control mode on the basis of oxygen DO.Or using dissolution oxygen detection and motorized adjustment butterfly valve as simple control loop, when
When DO value in biochemical reaction tank is greater than some setting value, electric butterfly valve is closed；Then when DO value is less than some setting value
Open electric butterfly valve.Or use PID(proportional-integral-differential) and Set-value adjustment is carried out, according to dissolution oxygen detection in pond
DO feedback signal is compared with DO setting value, by deviation by being transmitted to the journey controller control valve of valve after PID arithmetic
Aperture, and then control pond in DO value.The shortcomings that above-mentioned control method, is: first is that due to time delay, i.e., from starting to expose
DO variation needs a period of time in gas to pond, causes the control of dissolved oxygen to fluctuate very big；Second is that above-mentioned method energy consumption is high, in order to
Guarantee safe operation, the DO setting value of system can only be maintained at it is higher numerically, cause to waste so that energy consumption is higher；Third is that mistake
Big fluctuation meeting interferes the work of biosystem so that the biotic environment in pond is unstable.
Summary of the invention
The present invention overcomes the deficiencies of existing aeration mode, provide a kind of sewage treatment plant's accurate aeration control method.
To achieve the above object, the technical solution adopted by the present invention are as follows: it is a kind of based on water outlet ammonia nitrogen and dissolved oxygen it is accurate
Aeration control method, including biochemical reaction tank, ammonia nitrogen in-line analyzer, dissolved oxygen in-line analyzer, host computer and air blower, institute
It states ammonia nitrogen in-line analyzer and the dissolved oxygen in-line analyzer is arranged at the water outlet of the biochemical reaction tank, the ammonia nitrogen
In-line analyzer and the dissolved oxygen in-line analyzer are connected with the host computer of Central Control Room, are provided in the host computer
Line traffic control platform, the air blower are mounted on aerator, the host computer connection of the air blower and Central Control Room；
To the ammonia nitrogen concentration and dissolved oxygen concentration progress real-time monitoring in pond and concentration data is uploaded to central control room upper computer, on
On-line Control platform is set in the machine of position, by comparing the set point concentration and real-time concentration of ammonia nitrogen and dissolved oxygen, judges that difference is set
Standby required operating status takes corresponding regulation measure, start and stop air blower or frequency control operation: if the real-time concentration of ammonia nitrogen
Greater than ammonia nitrogen set point high level CNMAX, then requires the dissolved oxygen in biological tank to maintain higher level, exposed at this time
Gas opens air blower or increases running frequency；If the real-time concentration of ammonia nitrogen is less than ammonia nitrogen set point low value CNmin, give birth at this time
Dissolved oxygen in object pond maintains reduced levels, needs to stop at this time being aerated, and closes air blower or reduces running frequency；
The set point numerical value of ammonia nitrogen and dissolved oxygen concentration requires to determine according to effluent quality；If executing level-one A standard, ammonia nitrogen setting
Point high level CNMAX is between 3.0-4.5 mg/L, and low value CNMIN is between 0.5-2.0 mg/L；Dissolved oxygen set point high level
CDOMAX is 2.0 ± 0.2 mg/L, and low value CDOMIN is 1.0 ± 0.2 mg/L, with specific reference to the practical feelings of each sewage treatment plant
Depending on condition；If executing " quasi- IV class " standard, between 1.5-1.8 mg/L, low value CNMIN's ammonia nitrogen set point high level CNMAX exists
Between 0.2-1.0 mg/L；Dissolved oxygen set point high level CDOMAX is 2 ± 0.2 mg/L, and low value CDOMIN is 1 ± 0.2 mg/L.
In normal conditions, it is required according to effluent quality, sets suitable concentration set point, aerator is according to DO/
The start and stop of NH3-N signal or converting operation.
The concentration set point of dissolved oxygen and ammonia nitrogen requires determination according to effluent quality, is discharged 5 mg/L of ammonia nitrogen <.
The concentration set point of dissolved oxygen and ammonia nitrogen requires determination according to effluent quality, is discharged 2 mg/L of ammonia nitrogen <.
The beneficial effects of the present invention are:
By acquiring the on-line analysis instrument real time data of biochemical reaction tank, change the fortune of regulation air blower according to pollutant concentration
Row, accurately controls aeration quantity, is fitted aeration oxygen-supplying amount to greatest extent with biochemical reaction oxygen demand, makes the dissolved oxygen in biological tank
Concentration rationally fluctuates, and to obtain the balance of the different contaminant removal processes such as COD, BOD, nitrogen, phosphorus, prevents aeration deficiency, aeration
The generation of excessive phenomenon.
The present invention realizes accurate control, supplies as desired, reduces sewage treatment plant's processed in units cost；Stabilizing active is dirty
Mud biological treatment environment improves active sludge treatment efficiency；Stablize effluent index, resists instant water coming-in load impact bring row
Bleed off pressure power；Precision and intelligent, reduction field personnel's labor intensity.
Detailed description of the invention
Fig. 1 is schematic structural view of the invention；
Fig. 2 is to control program schematic diagram according to the selection of in-line meter signal judgement；
Fig. 3 is biochemical reaction tank dissolved oxygen, ammonia nitrogen on-line analysis instrument layout drawing；
Fig. 4 is accurate control model logic chart；
Fig. 5 is ammonia control mode logic figure；
Fig. 6 is dissolved oxygen control model logic chart；
Fig. 7 is time control model logic chart；
Fig. 8 is ammonia nitrogen concentration change curve under accurate control model.
Specific embodiment
Sewage treatment plant's raw water is after pretreatment, by elevator pump by sewage lifting to biochemical treatment tank.According to water inlet
Aeration air blast total amount needed for water quality, water calculate sewage treatment, matches blower air quantity, wind pressure, power, quantity.In biochemistry
Dissolved oxygen, ammonia nitrogen on-line monitoring instrument, the real time measure dissolved oxygen, ammonia nitrogen concentration, according to actual oxygen demand are set in processing pond
The operating status of adjustment air blower in real time.
Biochemical reaction tank dissolved oxygen, ammonia nitrogen in-line meter layout drawing are detailed in Fig. 3.
It will be encoded in intelligent control platform with lower set point and can free assignment:
Dissolved oxygen concentration set point high level CDOmax；
Dissolved oxygen concentration set point low value CDOmin；
Ammonia nitrogen concentration set point high level CNmax；
Ammonia nitrogen concentration set point low value CNmin；
The sampling interval T of dissolved oxygen, ammonia nitrogen on-line analysis instrument.
Below using a certain sewage treatment plant in Gansu as case study on implementation, method of the invention is described in detail.The Designing Sewage Treatment Plant
Scale is 100,000 ton/days, and water quality discharge executes level-one A standard.Because western at the factory site, long-term water temperature is relatively low, in order to guarantee
Safe operation, setting value surplus are larger.To each control model, details are as follows.
Accurate control model:
When ammonia nitrogen and dissolved oxygen instrument in biochemistry pool can provide valid data, robot control system(RCS) automatically selects accurate aeration mould
Formula.
Set CDOmax=2 mg/L, CDOmin=1 mg/L, CNmax=3 mg/L, CNminThe min of=2 mg/L, T=30.
It is every to pass through time T, an ammonia nitrogen and dissolved oxygen instrument tabular value are acquired, is compared with setting value:
If ammonia nitrogen concentration CN> CNmax, judgement needs to start or reinforce aeration at this time, and it is further to compare dissolved oxygen numerical value, if dissolved oxygen
Concentration CDO< CDOmin, then open air blower or increase frequency, if dissolved oxygen concentration CDO≥CDOmin, equipment maintains the statusquo；
If ammonia nitrogen concentration CN< CNmin, judgement needs to stop or weaken aeration at this time, and it is further to compare dissolved oxygen numerical value, if dissolved oxygen
Concentration CDO> CDOmax, then close air blower or reduce frequency, if dissolved oxygen concentration CDO≤CDOmin, equipment maintains the statusquo；
If ammonia nitrogen concentration CNmin< CN< CNmax, equipment maintains the statusquo.
Ammonia control mode:
If dissolved oxygen instrument breaks down, robot control system(RCS) automatically selects ammonia control mode, only according to the actual measurement of ammonia nitrogen instrument
Value and setting value control aeration process.
Set CNmax=3 mg/L, CNminThe min of=1 mg/L, T=30.
If ammonia nitrogen concentration CN> CNmax, need to start or reinforce to be aerated, i.e. unlatching air blower or increase frequency；
If ammonia nitrogen concentration CN< CNmin, need to stop or weaken aeration, i.e. closing air blower or reduction frequency；
If ammonia nitrogen concentration CNmin< CN< CNmax, equipment maintains the statusquo；
Dissolved oxygen control model:
If ammonia nitrogen instrument breaks down, robot control system(RCS) automatically selects dissolved oxygen control model, only according to the reality of dissolved oxygen instrument
Measured value and setting value control aeration process.
Set CDOmax=2.5 mg/L, CDOmin=1.5 mg/L, T=30min.
If dissolved oxygen concentration CDO> CDOmax, then close air blower or reduce frequency；
If dissolved oxygen concentration CDO< CDOmin, then open air blower or increase frequency；
If dissolved oxygen concentration CDOmin< CDO< CDOmax, equipment maintains the statusquo；
Time control model:
If dissolved oxygen, the equal failure of ammonia nitrogen in-line analyzer, intelligent control platform selecting time control model (fixed air quantity
And the set time).Blower equipment is according to preset aeration time TN, not aeration time TDNFixed operating status, with TNWith TDN
The sum of be a cycle of operation, it is identical as the fan operation mode of conventional sewage plants.
Set aeration time TN=180min, not aeration time TDN=60min。
In intelligent control platform, sewage plant operational management personnel can control mould with situation unrestricted choice according to instrument
Formula: accurate control model, ammonia control mode, dissolved oxygen control model, base control mode control logic figure be detailed in Fig. 4,
Fig. 5, Fig. 6 and Fig. 7.
The instrument that the present invention uses is sewage treatment plant's conventional arrangement instrument, therefore nearly all sewage treatment plant is provided with
The hardware condition of accurate aeration control is realized by using intelligent control platform.
Continuous 6 months accurate aerations control has been carried out in the factory within 2016, the results showed that, the system run all right, out
Water water quality meets design standard, and compliance rate is higher than 96%, and compared with before the application system, which reduces by 18.5%,
Ton water power consumption reduces by 11.4%.
The above detailed description implementation principle of the invention, implementation method and implementation result.The present invention does not limit reality
Apply range, all change and modification according under control design of the invention, control method, should belong to protection scope of the present invention it
It is interior.
Claims (4)
1. a kind of accurate aeration control method based on water outlet ammonia nitrogen and dissolved oxygen, it is characterized in that: including biochemical reaction tank, ammonia nitrogen
In-line analyzer, dissolved oxygen in-line analyzer, host computer and air blower, the ammonia nitrogen in-line analyzer and the dissolved oxygen are online
Analyzer is arranged at the water outlet of the biochemical reaction tank, the ammonia nitrogen in-line analyzer and the dissolved oxygen in-line analyzer
It is connected with the host computer of Central Control Room, line traffic control platform is provided in the host computer, the air blower is mounted on aeration
In equipment, the host computer of the air blower and Central Control Room is connected；
To the ammonia nitrogen concentration and dissolved oxygen concentration progress real-time monitoring in pond and concentration data is uploaded to central control room upper computer, on
On-line Control platform is set in the machine of position, by comparing the set point concentration and real-time concentration of ammonia nitrogen and dissolved oxygen, judges that difference is set
Standby required operating status takes corresponding regulation measure, start and stop air blower or frequency control operation: if the real-time concentration of ammonia nitrogen
Greater than ammonia nitrogen set point high level CNMAX, then requires the dissolved oxygen in biological tank to maintain higher level, exposed at this time
Gas opens air blower or increases running frequency；If the real-time concentration of ammonia nitrogen is less than ammonia nitrogen set point low value CNmin, give birth at this time
Dissolved oxygen in object pond maintains reduced levels, needs to stop at this time being aerated, and closes air blower or reduces running frequency；
The set point numerical value of ammonia nitrogen and dissolved oxygen concentration requires to determine according to effluent quality；If executing level-one A standard, ammonia nitrogen setting
Point high level CNMAX is between 3.0-4.5 mg/L, and low value CNMIN is between 0.5-2.0 mg/L；Dissolved oxygen set point high level
CDOMAX is 2.0 ± 0.2 mg/L, and low value CDOMIN is 1.0 ± 0.2 mg/L, with specific reference to the practical feelings of each sewage treatment plant
Depending on condition；If executing " quasi- IV class " standard, between 1.5-1.8 mg/L, low value CNMIN's ammonia nitrogen set point high level CNMAX exists
Between 0.2-1.0 mg/L；Dissolved oxygen set point high level CDOMAX is 2 ± 0.2 mg/L, and low value CDOMIN is 1 ± 0.2 mg/L.
2. accurate aeration control method according to claim 1, it is characterized in that: in normal conditions, according to effluent quality
It is required that setting suitable concentration set point, aerator is according to the start and stop of DO/NH3-N signal or converting operation.
3. accurate aeration control method according to claim 2, it is characterized in that: the concentration set point root of dissolved oxygen and ammonia nitrogen
It requires to determine according to effluent quality, is discharged 5 mg/L of ammonia nitrogen <.
4. accurate aeration control method according to claim 2, it is characterized in that: the concentration set point root of dissolved oxygen and ammonia nitrogen
It requires to determine according to effluent quality, is discharged 2 mg/L of ammonia nitrogen <.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811181907.7A CN109205808A (en) | 2018-10-11 | 2018-10-11 | A kind of accurate aeration control method based on water outlet ammonia nitrogen and dissolved oxygen |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436609A (en) * | 2019-08-01 | 2019-11-12 | 合肥通用机械研究院有限公司 | A kind of Intellectualized sewage water processing aeration control method with self-learning function |
| CN110606545A (en) * | 2019-10-23 | 2019-12-24 | 成都云尚物联环境科技有限公司 | Aeration system for sewage treatment in villages and towns and control method thereof |
| CN114249415A (en) * | 2021-12-22 | 2022-03-29 | 北京城市排水集团有限责任公司 | Precise aeration device and method |
| CN116216913A (en) * | 2023-02-20 | 2023-06-06 | 浙江数翰科技有限公司 | MBBR pulse aeration control method and system |
| CN116969616A (en) * | 2023-08-04 | 2023-10-31 | 中国长江三峡集团有限公司 | Soft measurement-based integrated sewage treatment facility control method, device and equipment |
| CN117509928A (en) * | 2023-11-03 | 2024-02-06 | 安徽泛湖生态科技股份有限公司 | OTE real-time monitoring-based aeration optimization energy-saving control system and method |
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| CN203613020U (en) * | 2013-12-18 | 2014-05-28 | 清华大学 | Airblasting and airing process real time control device for sewage treatment plant |
| CN104102255A (en) * | 2014-07-17 | 2014-10-15 | 北京城市排水集团有限责任公司 | Ammonia nitrogen coupling dissolved oxygen aeration energy-saving control system and control method |
| CN107500408A (en) * | 2017-09-04 | 2017-12-22 | 信开水环境投资有限公司 | A kind of multistage A/O techniques aeration control system fed back based on ammonia nitrogen and dissolved oxygen |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203613020U (en) * | 2013-12-18 | 2014-05-28 | 清华大学 | Airblasting and airing process real time control device for sewage treatment plant |
| CN104102255A (en) * | 2014-07-17 | 2014-10-15 | 北京城市排水集团有限责任公司 | Ammonia nitrogen coupling dissolved oxygen aeration energy-saving control system and control method |
| CN107500408A (en) * | 2017-09-04 | 2017-12-22 | 信开水环境投资有限公司 | A kind of multistage A/O techniques aeration control system fed back based on ammonia nitrogen and dissolved oxygen |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436609A (en) * | 2019-08-01 | 2019-11-12 | 合肥通用机械研究院有限公司 | A kind of Intellectualized sewage water processing aeration control method with self-learning function |
| CN110606545A (en) * | 2019-10-23 | 2019-12-24 | 成都云尚物联环境科技有限公司 | Aeration system for sewage treatment in villages and towns and control method thereof |
| CN114249415A (en) * | 2021-12-22 | 2022-03-29 | 北京城市排水集团有限责任公司 | Precise aeration device and method |
| CN116216913A (en) * | 2023-02-20 | 2023-06-06 | 浙江数翰科技有限公司 | MBBR pulse aeration control method and system |
| CN116216913B (en) * | 2023-02-20 | 2023-12-05 | 浙江数翰科技有限公司 | MBBR pulse aeration control method and system |
| CN116969616A (en) * | 2023-08-04 | 2023-10-31 | 中国长江三峡集团有限公司 | Soft measurement-based integrated sewage treatment facility control method, device and equipment |
| CN117509928A (en) * | 2023-11-03 | 2024-02-06 | 安徽泛湖生态科技股份有限公司 | OTE real-time monitoring-based aeration optimization energy-saving control system and method |
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