CN104102255B - Ammonia nitrogen couples dissolved oxygen aeration energy-saving control system and control method - Google Patents
Ammonia nitrogen couples dissolved oxygen aeration energy-saving control system and control method Download PDFInfo
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- CN104102255B CN104102255B CN201410342631.1A CN201410342631A CN104102255B CN 104102255 B CN104102255 B CN 104102255B CN 201410342631 A CN201410342631 A CN 201410342631A CN 104102255 B CN104102255 B CN 104102255B
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a kind of ammonia nitrogen coupling dissolved oxygen aeration energy-saving control system and control method, control system is provided with and PLC automatic controls component and computer is provided with switch board, cabinet, and computer is built with data collection and analysis circuit module；It is provided with online liquid level gauge, online ammonia nitrogen instrument, online sludge concentration meter, online thermometer, online dissolved oxygen meter, the online intelligent ammonia nitrogen analyzer of all-weather and online sludge nitrification activity intelligent analytical instrument；Aerating pipelines are provided with gas equilibrium allocation device, gas flowmeter, air pressure gage.Control method comprises the following steps：1) computer is incorporated into data collection and analysis program；2) data are obtained by sewage treatment plant's computer and in-line meter and calculates the air demand in aeration tank；3) switch board is according to the output tolerance for calculating gained air demand adjustment air blower；4) dissolved oxygen is finely adjusted according to dissolved oxygen setting value.The present invention is adapted to assist in biological tank and realizes that aeration rate is automatically controlled, and control is flexible, high degree of automation, can greatly save the energy, improves sewage treatment process stability.
Description
Technical field
Patent of the present invention is related to a kind of sewage disposal technology, specifically a kind of ammonia nitrogen coupling dissolved oxygen aeration energy-saving control system
System and control method, it is adaptable to control the aeration along journey in municipal sewage plant's activated sludge process biological treatment biological tank
Intensity and dissolving oxygen gradient, can improve Nitrogen/Phosphorus Removal, strengthen operation stability and save aeration energy consumption.
Technical background
At present, sewage disposal overlay area in domestic city is more and more wider, and treatment standard is more and more stricter.Many newly-built sewage
Just in investment construction, some old sewage treatment plants face upgrading for treatment plant, with meet the treatment water that gradually increases and
Increasingly strict Effluent criteria.In existing and newly-built sewage treatment plant, existing traditional biological handling process, such as A2O techniques etc.,
Also there are some new technology being promoted property applications, such as MBR techniques.The operation stability of biological treatment, reliability, efficiently
Property will it is up to standard on municipal sewage plant's sewage disposal and realize regeneration influence it is great.
Traditional biological handling process such as A2O techniques, with technology maturation, run it is simple to operate, be widely used the features such as, and
New technology such as MBR techniques have the features such as saving is taken up an area, effluent quality is preferable.However, either traditional handicraft or new technology,
Have the shortcomings that energy consumption is universal higher, especially aeration energy consumption, this undoubtedly significantly increases operating cost.Activated sludge process
In biological treatment, the biological tank section method of operation generally includes anaerobic zone, anoxic zone and aerobic zone.In order to ensure removal COD
With the aerobic pollutant such as ammonia nitrogen, aerobic zone is often in excess aeration state.According to statistics, A2O techniques ton water power consumption 0.3~
0.4kWh/m3Left and right, and MBR techniques are then up to 0.5~0.7kWh/m3Left and right, even more high.No matter which kind of technique, aeration are used
System energy consumption accounts for the 50%~70% of technique total energy consumption.And excess aeration can influence sludge microbe activity, so as to influence
Operation stability.
Therefore, under the target promotion for improving sewage treatment process operational effect and stability and reducing operation energy consumption, have
Necessity exploitation biological tank aeration energy-saving control system and method, to help realize the sustainable of activated sludge process biological treatment
Development.
The content of the invention
The object of the invention is directed to above-mentioned technical problem, there is provided a kind of ammonia nitrogen coupling dissolved oxygen aeration energy-saving control system and
Control method, the present invention sets up standby detecting system and automatic control system, and the control mode of dissolved oxygen is coupled using ammonia nitrogen,
It is final control targe with water outlet ammonia nitrogen value, is intermediate regulations parameter with dissolved oxygen value.By flowmeter and on-line sensor etc.
The online signal such as flow, dissolved oxygen and ammonia nitrogen is fed back into computation model, again to aeration tank after calculating tolerance needed for calculating in real time
Supplied, and air demand is modified according to dissolved oxygen setting value and online instantaneous value.The method automatically and reasonably controls to expose
Tolerance, can meet the science control to aeration rate, and can help realize that handling process efficient stable runs, and ensure water outlet ammonia nitrogen
Stably reaching standard.
To achieve the above object, this invention takes following technical scheme：
Ammonia nitrogen couples dissolved oxygen aeration energy-saving control system, it is characterized in that：Switch board is provided with, is installed in switch board
PLC automatic controls component and computer, the computer is built with data collection and analysis circuit module, computer and PLC automatic control components
Carry out signal and control is connected；Be provided with online liquid level gauge on each biological tank of sewage treatment process, online ammonia nitrogen instrument,
The online intelligent ammonia nitrogen analyzer of line sludge concentration meter, online thermometer, online dissolved oxygen meter, all-weather and online sludge nitre
Change active intelligent analytical instrument；The above-mentioned in-line meter on biological tank carries out signal with the computer in the switch board
Connection；Gas equilibrium allocation device, gas flowmeter, wherein air pressure gage, gas are provided with the aerating pipelines of the biological tank
Body equilibrium allocation device carries out signal with PLC automatic controls component and computer respectively and control is connected, gas flowmeter and air pressure
Meter carries out signal and is connected with computer；In addition, the controller and PLC automatic control components of the air blower that biological tank aerating pipelines are connected
Carry out signal and control is connected, the computer also carries out signal with the host computer of sewage treatment plant and control is connected.
Dissolved oxygen aeration energy-saving system control method is coupled using above-mentioned ammonia nitrogen, its feature comprises the following steps：
1) above-mentioned instrumentation is installed afterwards and sets up mutual signal connection；Formula below (1)-(3) are compiled
Enter in the program of computer 3：
Wherein,
Biological reaction pool sewage oxygen demand (kgO under Os- standard state2/h)；
Flow of inlet water (the m of Q- biological reaction pools3/ d), collected from sewage treatment plant's host computer；
ΔXHThe microbial biomass (kg/d) of-discharge biological respinse cell system, adopts from sewage treatment plant's host computer
Collection is obtained；
Nt- biological reaction pool influent ammonium concentration (mg/L), is measured by ammonia nitrogen determination sensor；
Nte- biological reaction pool water outlet ammonia nitrogen concentration (mg/L), is measured by the online intelligent ammonia nitrogen analyzer (9) of all-weather；
SS- water outlet organic substrates concentration (mg/L)；Collected from sewage treatment plant's host computer；
MLVSS proportions in y-MLSS, determine according to experiment；
Yt- sludge Total yield constants (kgMLSS/kgBOD5), determined according to experiment；
SSF- water inlet organic substrates concentration, mg/L is collected from sewage treatment plant's host computer；
So- dissolved oxygen concentrations, mg/L is measured by online dissolved oxygen meter (8)；
qA- aeration rate, m3/h；
EAThe utilization rate (%) of-aerator oxygen
2) organic substrates concentration, flow of inlet water, biological pool volume are obtained by sewage treatment plant's host computer 15；
Line instrument (4)-(10) will biology pit level, influent ammonium concentration, sludge concentration, temperature, dissolved oxygen, water outlet ammonia nitrogen be dense accordingly
Degree and rate of nitrification numerical value, to computer, exposure are calculated by computer by 4~20mA signal transmissions according to formula (1)-(3)
Air demand q in gas pondA；
3) computer (3) is by qAData transfer gives air compressor control cabinet (14), then by air blower (16) and its switch board
(14) adjustment air blower output tolerance, reaches calculated value qA；
4) at the same time, online sludge nitrification activity intelligent analytical instrument 10 is fast by the Ammonia Nitrification under different dissolved oxygen concentration
Rate value is transferred to computer 3, and computer 3 draws the law curve that Ammonia Nitrification speed changes with dissolved oxygen, then according to online
The hydraulic detention time value of sludge concentration meter 6, online thermometer 7 and design：14 hours, determine the nitrification of reality in biological tank
Speed, and corresponding dissolved oxygen concentration is found with the law curve that dissolved oxygen changes by Ammonia Nitrification speed, dissolved with this
Oxygen concentration is used as dissolved oxygen control setting value DOSET；
5) when air blower presses qADuring value output tolerance, the actual flow value and q for first feeding back gas flowmeter 12AValue phase
Compare, and if qAValue is inconsistent, and air blower is adjusted until reaching q againAValue, and if qAValue consistent then adjustment cycle
Inside no longer air blower tolerance is adjusted.But, according to actual dissolved oxygen value and DO that online dissolved oxygen meter 8 feeds backSET
Compare, no longer carry out any adjustment in the cycle if consistent, it is balanced to the gas being furnished with aeration branch pipe if inconsistent
Configurator 11 is adjusted, the actual dissolved oxygen value and DO for feeding back online dissolved oxygen meter 8SETValue is consistent.Aeration is carried out
During accurate adjustment, the value of feedback of air pressure gage 13 need to be in real time considered, the value indicates air blower working condition or gas piping
Whether situation is normal；
Gas equilibrium allocation device is adjusted, the dissolved oxygen of stabilization is realized；It is balanced to the gas on all supply air lines
Three principles are followed when configurator is adjusted：1st, regulation simultaneously is avoided；2nd, gas equilibrium allocation device aperture summation keeps constant；
3rd, a gas equilibrium allocation device aperture always is in maximum；
6) return to step 2), constantly repeat above-mentioned regulation process, it is contemplated that tolerance transmit and gas in water mass transfer it is stagnant
Property afterwards, and for the protection to the frequent regulation of equipment, twice qAValue calculate between and twice dissolved oxygen value adjustment between when
Between interval will >=30s.
The present invention has the special feature that and beneficial effect：
1) ammonia nitrogen coupling dissolved oxygen control method for saving energy of aeration is widely used in activated sludge process biological treatment aeration
Pond.
2) control method is calculated as foundation with model, has universality to various biological treatments, can be according to specific work
Skill parameter is adjusted flexibly.
3) it is final control targe with water outlet ammonia nitrogen, has ensured that effluent quality reaches to greatest extent while saving aeration rate
Mark.
4) this control method can realize save aeration consumption 10% in the demonstration project application of certain 200,000 ton day.Therefore,
Energy-saving effect is notable when rationally being controlled aerating system using the control method.
5) this method employs various in-line meters, realizes while to aeration rate precise control, can aid in running people
Member is predicted analysis to state of arts.
Brief description of the drawings：
Fig. 1 is the structural representation of control system of the invention.
In figure：1. switch board；2.PLC automatic control components；3. computer, 4. online liquid level gauge；5. on-line intelligence ammonia nitrogen analysis
Instrument；6. online sludge concentration meter；, 7. online thermometer；8. online dissolved oxygen meter；9. round-the-clock intelligent ammonia nitrogen analyzes system
System；10. sludge nitrification activity intelligent analysis system；11. adjustment gas equilibrium allocation devices；12. gas flowmeters；13. air pressures
Power meter；The controller of 14. air blowers；15. host computers；
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is explained：Embodiment 1：Referring to accompanying drawing, ammonia nitrogen coupling dissolved oxygen exposes
Gas energy-saving control system, is provided with switch board 1, is provided with PLC automatic controls component 2 and computer 3 in switch board, the computer built with
Data collection and analysis circuit module, computer carries out signal with PLC automatic controls component and control is connected；It is provided with installed in sewage disposal
It is online liquid level gauge 4, ammonia nitrogen determination sensor 5, online sludge concentration meter 6, online thermometer 7 on each biological tank of equipment, online
The online intelligent ammonia nitrogen analyzer 9 of dissolved oxygen meter 8, all-weather and online sludge nitrification activity intelligent analytical instrument 10；Above-mentioned peace
In-line meter on biological tank carries out signal connection with the computer in the switch board；In the aeration of the biological tank
Pipeline is provided with gas equilibrium allocation device 11, gas flowmeter 12, air pressure gage 13, wherein gas equilibrium allocation device respectively with
PLC automatic controls component carries out signal and is connected with control with computer, and gas flowmeter and air pressure gage carry out signal with computer
Connection；In addition, the switch board 14 of the air blower 16 of biological tank aerating pipelines connection carries out signal with PLC automatic controls component and control connects
Connect；The computer also carries out signal with the host computer 15 of sewage treatment plant and control is connected.
Embodiment 2：Ammonia nitrogen couples the control method of dissolved oxygen aeration energy-saving system, comprises the following steps：
1) above-mentioned instrumentation is installed afterwards and sets up mutual signal connection；Formula below (1)-(3) are compiled
Enter in the program of computer 3：
Wherein,
Biological reaction pool sewage oxygen demand (kgO under Os- standard state2/h)
Flow of inlet water (the m of Q- biological reaction pools3/ d), collected from sewage treatment plant's host computer 15
ΔXHThe microbial biomass (kg/d) of-discharge biological respinse cell system
Nt- biological reaction pool influent ammonium concentration (mg/L), is measured by ammonia nitrogen determination sensor 5；
Nte- biological reaction pool water outlet ammonia nitrogen concentration (mg/L), is measured by the online intelligent ammonia nitrogen analyzer 9 of all-weather；
SS- water outlet organic substrates concentration (mg/L)；Collected from sewage treatment plant's host computer；
MLVSS proportions in y-MLSS, determine according to experiment；
Yt- sludge Total yield constants (kgMLSS/kgBOD5), determined according to experiment；
SSF- water inlet organic substrates concentration, mg/L is collected from sewage treatment plant's host computer 15；
So- dissolved oxygen concentrations, mg/L is measured by online dissolved oxygen meter 8；
qA- aeration rate, m3/h；
EAThe utilization rate of-aerator oxygen, %.
2) organic substrates concentration, water, biological pool volume, backflow are obtained by sewage treatment plant's host computer 15
Amount；In-line meter 4-10 will corresponding biology pit level, influent ammonium concentration, sludge concentration, temperature, dissolved oxygen, water outlet ammonia nitrogen
Concentration and rate of nitrification numerical value pass through 4~20mA signal transmissions to computer 3, by computer 3 according to above-mentioned formula (1)-(3)
Calculate the air demand q in aeration tankAIt is 1,600,000 kg/h, specific calculating process is as follows：
Water quality and quantity value
Above-mentioned water quality and quantity value is existed by online liquid level gauge 4, ammonia nitrogen determination sensor 5, all-weather respectively
Line intelligent ammonia nitrogen analyzer 9 and host computer 15 are obtained.
Wherein y values take 0.8, YtValue takes 0.8, and above-mentioned data are substituted into formula (1) obtains：
Formula (2) is substituted into obtain：
EA20% is taken at place, formula (3) is substituted into and is obtained：
3) computer 3 is by qAData transfer to air compressor control cabinet 14, then by switch board 14 according to qAValue output tolerance；
4) at the same time, online sludge nitrification activity intelligent analytical instrument 10 is fast by the Ammonia Nitrification under different dissolved oxygen concentration
Rate value is transferred to computer 3, and computer 3 draws the law curve that Ammonia Nitrification speed changes with dissolved oxygen, then according to online
The hydraulic detention time value (14 hours) of sludge concentration meter 6, online thermometer 7 and design determines the nitrification of reality in biological tank
Speed, and corresponding dissolved oxygen concentration is found with the law curve that dissolved oxygen changes by Ammonia Nitrification speed, dissolved with this
Oxygen concentration is used as dissolved oxygen control setting value DOSET。
5) when air blower presses qADuring value output tolerance, the actual flow value and q for first feeding back gas flowmeter 12AValue phase
Compare, and if qAValue is inconsistent, and air blower is adjusted until reaching q againAValue, and if qAValue consistent then adjustment cycle
Inside no longer air blower tolerance is adjusted.But, according to actual dissolved oxygen value and DO that online dissolved oxygen meter 8 feeds backSET
Compare, no longer carry out any adjustment in the cycle if consistent, it is balanced to the gas being furnished with aeration branch pipe if inconsistent
Configurator 11 is adjusted, the actual dissolved oxygen value and DO for feeding back online dissolved oxygen meter 8SETValue is consistent.Aeration is carried out
During accurate adjustment, the value of feedback of air pressure gage 13 need to be in real time considered, the value indicates air blower working condition or gas piping
Whether situation is normal.
Three principles are followed when being adjusted to the gas equilibrium allocation device on all supply air lines：1st, avoid adjusting simultaneously
Section；2nd, gas equilibrium allocation device aperture summation keeps constant；3rd, a gas equilibrium allocation device aperture always is in maximum；
6) return to step 2), constantly repeat above-mentioned regulation process, it is contemplated that tolerance transmit and gas in water mass transfer it is stagnant
Property afterwards, and for the protection to the frequent regulation of equipment, twice qAValue has the time interval of 15min between calculating, per molten twice
Time interval between solution oxygen value adjustment is 2min.
This two embodiment trial operations 6 months, effect is fairly obvious, aeration energy consumption reduces 10% more originally, rationally
Effluent index is effect improved substantially after control aeration, and system level A compliance rates can be stably maintained at more than 90%.
Claims (1)
1. a kind of ammonia nitrogen coupling dissolved oxygen aeration energy-saving control system, is provided with switch board (1), and PLC automatic control groups are provided with switch board
Part (2) and computer (3), the computer are carried out built with data collection and analysis circuit module, computer with PLC automatic controls component
Signal and control are connected；Be provided with online liquid level gauge (4) on each biological tank of sewage disposal device, online ammonia nitrogen instrument (5),
Online sludge concentration meter (6), online thermometer (7), online dissolved oxygen meter (8), the online intelligent ammonia nitrogen analyzer of all-weather
And online sludge nitrification activity intelligent analytical instrument (10) (9)；The above-mentioned in-line meter on biological tank is with the control
Computer in cabinet carries out signal connection；Gas equilibrium allocation device (11), gas are provided with the aerating pipelines of the biological tank
Flowmeter (12), air pressure gage (13), wherein gas equilibrium allocation device carry out signal with PLC automatic controls component and computer respectively
Connected with control, gas flowmeter and air pressure gage carry out signal and be connected with computer；In addition, biological tank aerating pipelines are connected
Air blower (16) and air compressor control cabinet (14) and PLC automatic controls component carry out signal and control is connected；The computer (3) is also
Signal is carried out with the host computer (15) of sewage treatment plant and control is connected；
Above-mentioned ammonia nitrogen couples the control method of dissolved oxygen aeration energy-saving control system, it is characterized in that：Comprise the following steps：
1) above-mentioned instrumentation is installed afterwards and sets up mutual signal connection；Formula below (1)-(3) are incorporated into meter
In the program of calculation machine (3)：
Wherein,
Biological reaction pool sewage oxygen demand (kgO under Os- standard state2/h)
Flow of inlet water (the m of Q- biological reaction pools3/ d), collected from from sewage treatment plant's host computer (15)；
ΔXHThe microbial biomass (kg/d) of-discharge biological respinse cell system
Nt- biological reaction pool influent ammonium concentration (mg/L), is measured by online ammonia nitrogen instrument (5)；
Nte- biological reaction pool water outlet ammonia nitrogen concentration (mg/L), is measured by round-the-clock online intelligent ammonia nitrogen analyzer (9)；
SS- water outlet organic substrates concentration (mg/L)；Collected from from sewage treatment plant's host computer (15)；
MLVSS proportions in y-MLSS, determine according to experiment；
Yt- sludge Total yield constants (kgMLSS/kgBOD5), determined according to experiment；
SSF- water inlet organic substrates concentration (mg/L), collects from from sewage treatment plant's host computer (15)；
qA- aeration rate, (m3/h)；
EAThe utilization rate (%) of-aerator oxygen；
2) organic substrates concentration, flow of inlet water, biological pool volume are obtained by sewage treatment plant's host computer (15)；Online
Instrument (4-10) will corresponding biology pit level, influent ammonium concentration, sludge concentration, temperature, dissolved oxygen, water outlet ammonia nitrogen concentration and
Rate of nitrification numerical value gives computer (3) by 4~20mA signal transmissions, is counted according to above-mentioned formula (1)-(3) by computer (3)
Calculate the aeration rate q in aeration tankA；3) computer (3) is by qAData transfer gives air compressor control cabinet (14), then by air blower
Switch board (14) adjustment air blower output tolerance, reaches calculated value qA；
4) at the same time, online sludge nitrification activity intelligent analytical instrument (10) is by the Ammonia Nitrification speed under different dissolved oxygen concentration
Value is transferred to computer (3), and computer (3) draws the law curve that Ammonia Nitrification speed changes with dissolved oxygen, and then basis exists
The hydraulic detention time value of line sludge concentration meter (6), online thermometer (7) and design：14 hours, determine reality in biological tank
Rate of nitrification, and corresponding dissolved oxygen concentration is found with the law curve that dissolved oxygen changes by Ammonia Nitrification speed, with
This dissolved oxygen concentration is used as dissolved oxygen control setting value DOSET；
5) when air blower presses qADuring value output tolerance, the actual flow value and q for first feeding back gas flowmeter (12)AValue is compared
Compared with and if qAValue is inconsistent, and air blower is adjusted until reaching q againAValue, and if qAIn the value consistent then adjustment cycle not
Air blower tolerance is adjusted again；But, according to actual dissolved oxygen value and DO that online dissolved oxygen meter (8) feeds backSETPhase
Compare, no longer carry out any adjustment in the cycle if consistent, the gas equilibrium being furnished with aeration branch pipe is matched somebody with somebody if inconsistent
Put device (11) to be adjusted, the actual dissolved oxygen value and DO for feeding back online dissolved oxygen meter (8)SETValue is consistent；To be aerated into
During row accurate adjustment, the value of feedback of air pressure gage (13) need to be in real time considered, the value indicates air blower working condition or gas
Whether pipeline situation is normal；
Gas equilibrium allocation device is adjusted, the dissolved oxygen of stabilization is realized；To the gas equilibrium allocation on all supply air lines
Three principles are followed when device is adjusted：1st, regulation simultaneously is avoided；2nd, gas equilibrium allocation device aperture summation keeps constant；3rd, it is total
There is a gas equilibrium allocation device aperture to be in maximum；
6) return to step 2), constantly repeat above-mentioned regulation process, it is contemplated that tolerance transmits the hysteresis quality with gas mass transfer in water,
And for the protection to the frequent regulation of equipment, q twiceATime interval between value is calculated and between dissolved oxygen value adjustment twice
Will >=30s.
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