CN104238527A - Precise control method of sewage treatment plant aeration total quantity - Google Patents
Precise control method of sewage treatment plant aeration total quantity Download PDFInfo
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Abstract
The invention relates to a precise control method of sewage treatment plant aeration total quantity. The method includes: a water inlet COD instrument, a water inlet ammonia nitrogen online monitor, a water inlet flowmeter, a dissolved oxygen online monitor, a water outlet ammonia nitrogen online monitor, a central PLC and a plurality of blowers are disposed, the water inlet COD instrument, the water inlet ammonia nitrogen online monitor, the water inlet flowmeter and the dissolved oxygen online monitor are parallelly connected with the water outlet ammonia nitrogen online monitor and then connected with the central PLC, and the central PLC is connected with the blowers; the central PLC respectively collects four kinds of variable signals of water outlet ammonia nitrogen, DO values, water inlet COD and ammonia nitrogen, and water inlet quantity, the four kinds of variable signals are different in significance and are associated, the various signals have independent adjusting periods, and a precise control system using the central PLC to control and adjust the total air quantity of the blowers is formed. The method has the advantages that aeration quantity is saved, influence of the faults or measuring errors of a single instrument to a system judging result is weakened greatly, and stable operation of the whole system is guaranteed.
Description
Technical field
The invention belongs to sewage disposal system, particularly relate to the accuracy control method of a kind of sewage treatment plant aeration total amount.
Background technology
The sewage treatment process of sewage treatment plant in general, be divided into three steps: pre-service (coagulation, physical treatment): the organic substance mainly referring to the material also removal part removing Large stone, such as leaf, the polybag in water, the grains of sand etc., (thick between general use grid, with thin), settling pit, settling basin.Two stage treatment (main process): two stage treatment district: the nucleus of sewage disposal process, also be the maximum region of pollutant removal amount, by fan blower to aeration tank oxygen supply, COD, BOD, SS, ammonia nitrogen, TN, TP are significantly removed by anaerobism, anoxic, aerobic process by the active sludge in aeration tank, directly have influence on the removal amount of above-mentioned each pollutant index in the number of this process air blast machine room air demand; The mixed liquor that active sludge and process terminate rear sewage is precipitated at second pond, and supernatant enters downstream, and mud then returns biological reaction pool at bottom collection.
Tertiary treatment (advanced treating).
During two stage treatment, when adopting aerobic activated sludge process or biomembrance process to dispose of sewage, fan blower is the equipment that sewage treatment plant's energy consumption is the highest, therefore Boiler pressure control is the most important thing in sewage treatment plant's process management, the prime cost that the power cost Ye Shi sewage treatment plant simultaneously produced by blast aeration runs, generally can account for the 20%-40% of total cost, be one of prime cost in sewage disposal process.So analyze existing on-line monitoring equipment, and then the blow rate required reasonably controlling fan blower has very large meaning to control cost of sewage disposal.Simultaneously, because country improves the requirement of sewage disposal plant effluent nitrogen phosphorus, excess aeration is then unfavorable for the up to standard of nitrogen phosphorus very much, and therefore strict control aeration rate is for total nitrogen, total phosphorus up to standard and prevent the severe public contamination accidents such as downstream receiving water body generation wawter bloom or red tide from also having great meaning.
The process control method part of current wastewater treatment in China factory adopts manual control, also has part to adopt the model calculating of import or the air quantity automatic control system of dissolved oxygen DO reaction type.The manual control direction that to be exactly process engineer carry out judging that blower air quantity adjusts according to every online data and analysis data and amplitude.Manual method human factor is too much, and operating personnel's technical conditions require higher, and meanwhile, the adjustment frequency is lower, generally can accomplish one day 1-2 time.Manual control is owing to being doped with too much factor of thinking, there is control procedure to be more arbitrarily difficult to the moment and to show consideration for all influence factors, simultaneously artificial adjustment is also difficult to reach 24 hours and uninterruptedly performs, and the level of technology controlling and process personnel is also that very different easy appearances judges that to affect technique up to standard or cause energy dissipation by accident;
The control mode that model calculates is once fashionable for a time, a lot of sewage treatment plant spares no high price from introducing computation model abroad, that mathematical modeling is carried out to sewage treatment plant mostly, the all factors affecting blower air quantity modeling person thought input wherein, as the water yield, COD, ammonia nitrogen, temperature, pH, air pressure etc. of water inlet.These factors of influence all adopt again in-line meter to measure substantially.Carry out program computation according to a series of theoretical formula or experimental formula again, draw the airflow value that a certain moment fan blower should export.The robot control system(RCS) of model calculation type adopts real-time analysis influent quality water yield parameters, the technique air quantity in a certain moment is drawn according to a series of theoretical formula, the problem of this control mode is the accuracy too relying on in-line meter, frequent meeting brings butterfly effect because of the error of 1 instrument or fault, cause whole computation process and actual demand value far from each other, therefore this kind of self-con-tained unit seldom has the example of successful Application at home, simultaneously, because the factor in fact affecting air quantity is extremely complicated, as oxygen transmission efficiency, solarization air cap stopping state etc. can not survey or uncontrollable factor also can have an impact to air quantity, therefore, this model is difficult to thorough for all factor considerations, the air quantity calculated accordingly is also difficult to keep with actual demand amount coincideing, so this control mode seldom has the case history of successful Application at home, the greatest drawback of the control mode that model calculates is: Derivation of Mathematical Model computing show that theoretical air quantity too relies on the lesson of in-line meter accuracy, relatively independent between each variable, interdependence is less, if 1 or several in-line meters break down or the inaccurate impact on judged result of data is little.
The control mode of dissolved oxygen DO reaction type relies on 1 of biological tank setting or the measured value of the online dissolved oxygen meter of multiple stage and the target oxygen dissolving value of setting to compare, the feedback regulation blow rate required.The robot control system(RCS) of dissolved oxygen DO reaction type is equivalent to judge demand according to effect, although the problem that can influence factor avoided to a certain extent inconsiderate, but this control mode is equivalent to dissolved oxygen DO as the unique basis for estimation controlled, exist in the process of implementation and regulate too delayed and total blast volume do not regulated or the not good problem of ability, especially be difficult to adapt to the situation that water water quality and the water yield change greatly, simultaneously excessively strong to the dependence of dissolved oxygen meter, the fault of a dissolved oxygen meter just may cause whole system to be paralysed.
An accurate control difficult problem for sewage treatment plant's aeration urgently to be resolved hurrily total amount, expects to reduce cost of sewage disposal, to meet the demand of the sewage load day by day surged.
Summary of the invention
The present invention is to overcome deficiency of the prior art, the accuracy control method of a kind of sewage treatment plant aeration total amount is provided, introduce the theory of adaptive control, the determination of air quantity is acted in a diametrically opposite way, namely while based on employing influent quality water amount parameters, significantly reduce again the foundation of its weight as air quantity adjustment anticipation, but judge that the air quantity of current fan blower is high or low according to the effect after air quantity effect, and then according to the adjustment of judged result to the less stride that blower fan is fixed, make air quantity constantly be tending towards reasonable value.Four kinds of variablees of water outlet ammonia nitrogen, DO value, influent COD and ammonia nitrogen, amount of inlet water are had dividing of primary and secondary, and interrelated.The each own respective regulating cycles of four kinds of variablees, any one variable reaches its regulating cycle and all once can adjust total blast volume, the combination of four kinds of regulatory factors and making up mutually, makes the control accuracy of system and impact resistance be obtained for raising.The problem that the randomness existed when effectively can solve manual process adjustment is low with regulating the frequency; Solve again existing varitrol too to rely on in-line meter accuracy, be difficult to look after all influence factors, to the problem that water water quality and quantity change adaptive faculty is poor and adjustment is too delayed simultaneously.
The present invention for achieving the above object, be achieved through the following technical solutions, the accuracy control method of a kind of sewage treatment plant aeration total amount, it is characterized in that: conveniently sewage treatment plant obtains and designing requirement arranges influent COD instrument, ammonia nitrogen on-line computing model, feed water flow gauge, dissolved oxygen DO on-line computing model, water outlet ammonia nitrogen on-line computing model is placed and some fan blowers, set up central control room (CCR), by above-mentioned Instrument connection on the PLC of center, influent COD instrument, ammonia nitrogen on-line computing model, feed water flow gauge, dissolved oxygen DO on-line computing model is connected with water outlet ammonia nitrogen on-line computing model Hou Yu center PLC in parallel, described center PLC is connected with some fan blowers, described center PLC gathers four kinds of variable signal respectively with independent regulation cycle and the amplitude of accommodation respectively, namely water outlet ammonia nitrogen, DO value, influent COD and ammonia nitrogen, amount of inlet water have dividing of primary and secondary, and the four kinds of variable signal that are mutually related again, four kinds of variable signal are by center PLC unified allocation of resources and then mutually cover the shortage, and form the accuracy-control system that center PLC controls adjustment fan blower total blast volume,
Concrete control method step is as follows,
One, amount of inlet water, influent COD, influent ammonia nitrogen, DO value, water outlet ammonia nitrogen, blower air quantity signal input center PLC;
Two, center PLC carries out computing.Comprise: whether then to judge the action period of amount of inlet water, influent COD, influent ammonia nitrogen, DO value, the water outlet ammonia nitrogen factor, when certain Graph One factor arrives the action period, center PLC draws the judged result to aeration total amount under this factor currency according to the logical program of this factor, namely judgement higher or on the low side is made, if higher, air quantity lowers certain stride, if on the low side, air quantity raises certain stride;
The judgment formula of amount of inlet water is:
Adjustment amount=water yield difference * gas-water ratio;
The judgment formula of influent COD, ammonia nitrogen is:
If t3=T3;
If C3+A3=0;
Then F2=F2;
If C3+A3 ≠ 0;
Sca＝((C1*C3+5A1*A3)/(C2+5*A2))K2；
If Sca < 0.5, F2=F2-F3;
If 0.5≤Sca≤1.5, F2=F2;
If Sca > 1.5, F2=F2+F3;
t3＝0；
Wherein:
C1-------------influent COD measured value
C2-------------influent COD mean value, manually set if certain month influent COD mean value is 300mg/L according to the analysis data in a certain period, then the setting value of COD mean value is 300mg/L, if certain month influent COD mean value is 1000mg/L, then the setting value of COD mean value is 1000mg/L (general sewage treatment plant inflow COD mean value is between 100-1000mg/L).
C3---------------------------influent COD switch, normally gets 1, otherwise gets 0
A1---------------------------influent ammonia nitrogen measured value
A2------------influent ammonia nitrogen mean value,
A3----------------------influent ammonia nitrogen instrument switch, normally gets 1, otherwise gets 0
K2--influent COD, ammonia nitrogen weight coefficient,
Sca---------------------------influent COD, ammonia nitrogen add and judgment value
S-----------------------------always adds and judgment value
T3----------------------------influent quality judges the cycle, recommends value 24h
T3----------------------------natural time, influent quality timer
DO value judgment formula is:
If t2=T2;
If D1+D2+ ... + D16+C3+A3=0;
Then F2=F2;
If D1+D2+ ... + D16+C3+A3 ≠ 0;
If D1+D2+ ... + D16=0;
Then F2=F2;
If D1+D2+ ... + D16 ≠ 0;
So＝(((O1*D1)/M1+(O2*D2)/M2+…+(O16*D16)/M16)/(D1+D2+…+D16))K1
S＝So
If S < 0.5, F2=F2+F3;
If 0.5≤S≤1.5, F2=F2;
If S > 1.5, F2=F2-F3;
t2＝0；
Wherein:
Oi (i=1,2,3 ... n)--------------1-n DO instrument value
Mi (i=1,2,3 ... n)--------------1-n DO setting value
Di (i=1,2,3 ... n)--------------1-n DO instrument switch, the normal Di=1 of DO instrument, otherwise Di=0
K1--------------------------DO weight coefficient, suggestion value is 4
So-----------------------DO adds and judgment value
T2----------------------DO judges the cycle, recommends value 2h
T2----------------------natural time, DO judges timer
Water outlet ammonia nitrogen judgment formula is:
If N3=0, do not perform any operation;
If N3=1;
If t1=T1;
If N2 < is N1, do not perform any operation;
If N2 >=N1 and N2 < N1+1, then F2=F2+F3;
If N2 >=N1+1 and N2 < N1+2, then F2=F2+2*F3;
If N2 >=N1+2 and N2 < N1+3, then F2=F2+3*F3;
If N2 >=N1+3, then F2=F2+5*F3;
If t1=T1 (T1 recommends to get 12h here), then repeat above-mentioned deterministic process;
Wherein:
N1--------------------------water outlet ammonia nitrogen desired value
N2--------------------------water outlet ammonia nitrogen measured value
N3--------------------------water outlet ammonia nitrogen button, 0 is abnormal, and 1 is normal
The current air quantity of F1---------------------------, value of feedback (m
3/ h)
F2-----------------------------discharge quantity of fan, controlling value (m
3/ h)
F3-----------------------air quantity adjusting range, can manually set (m as required
3/ h)
T1-----------------------ammonia nitrogen, because of subcycle, can manually set as required
T1-----------------------natural time, water outlet ammonia nitrogen timer
Three, the new airflow value drawn after judgement is transferred to the topworks of fan blower, according to new airflow value adjustment air quantity;
Four, said process circulation is uninterruptedly carried out, to tackle the change of the factors such as real-time water quality and quantity, process conditions.
Described feed water flow flowmeter measurement error is less than 1%; The measuring period of described influent COD instrument, influent ammonia nitrogen on-line computing model is less than 24h, and measuring error is less than 15%; The measuring error of described dissolved oxygen DO on-line computing model is less than 0.1mg/L; The cycle of described water outlet ammonia nitrogen on-line computing model is less than 12h, and measuring error is less than 0.2mg/L.
After described fan blower is connected with center PLC, provide long-range start stop signal address to center PLC or accept long-range start stop signal, air force adjustment Signal Message Address and accept air quantity adjustment signal, and air force signal to be sent on PLC in real time.
Described flowmeter adopts random electromagnetic flowmeter, and its measuring transducer and probe one, be connected with center PLC by communication cable, measuring-signal can be sent on PLC in real time.
Beneficial effect: compared with prior art, operating for sewage treatment plant factor of influence is defined as five by the present invention, by the technological principle of these five kinds of factors of influence and auto-adaptive control theory being formed the logical relation that aeration total amount accurately controls.Five kinds of factors of influence are divided into and have dividing of primary and secondary, but the water outlet ammonia nitrogen that is mutually related, DO value, influent COD and ammonia nitrogen, amount of inlet water four kinds of variable signal, according to sewage treatment process principle, all kinds of factor is carried out the distribution of weighing factor and regulating cycle, participate in the accuracy controlling of air quantity respectively, make air quantity automatically close to most reasonable value.It reduces the fault of separate unit instrument or measuring error greatly on the impact of system judged result, ensures the stable operation of whole system.Save aeration rate, power consumption and the medicine consumption of sewage treatment plant's operation can also have been reduced while improving the water-quality guideline treatment effects such as TN, TP, in the cost improving water environment and reduction wastewater treatment, have larger effect.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the software flow block diagram that water quality judges;
Fig. 3 is the software flow block diagram that the water yield judges;
Fig. 4 is the position view of system in sewage treatment plant's flow process;
Fig. 5 is inflow history graphs;
Fig. 6 is the water outlet ammonia nitrogen situation map before system comes into operation;
Fig. 7, Fig. 8 are the DO situation maps before system comes into operation;
Fig. 9-Figure 10 is the water outlet ammonia nitrogen situation map after system comes into operation;
Figure 11-Figure 14 is the DO situation map after system comes into operation.
Wherein Fig. 4: 1. influent COD signal, influent ammonia nitrogen signal and flow of inlet water signal, 2. aeration tank dissolved oxygen signal, 3. water outlet ammonia nitrogen signal, 4. center PLC, 5. blower air quantity signal.-----signal wire.
Embodiment
Below in conjunction with preferred embodiment, to according to embodiment provided by the invention, details are as follows
Embodiment
Refer to accompanying drawing 1, accompanying drawing 4, the invention provides the accuracy control method of a kind of sewage treatment plant aeration total amount, comprise influent COD instrument, influent ammonia nitrogen on-line computing model, feed water flow gauge, dissolved oxygen DO on-line computing model, water outlet ammonia nitrogen on-line computing model, center PLC and some fan blowers, described influent COD instrument, ammonia nitrogen on-line computing model, feed water flow gauge, dissolved oxygen DO on-line computing model are connected with water outlet ammonia nitrogen on-line computing model Hou Yu center PLC in parallel, and described center PLC is connected with some fan blowers; Described center PLC gathers four kinds of variable signal respectively with independent regulation cycle and the amplitude of accommodation respectively, namely water outlet ammonia nitrogen, DO value, influent COD and ammonia nitrogen, amount of inlet water have dividing of primary and secondary, and the four kinds of variable signal that are mutually related again, four kinds of variable signal are by center PLC unified allocation of resources and then mutually cover the shortage, and finally realize the accurate control that center PLC controls adjustment fan blower total blast volume.
Concrete control method step is as follows,
One, amount of inlet water, influent COD, influent ammonia nitrogen, DO value, water outlet ammonia nitrogen, blower air quantity signal input center PLC;
Two, center PLC carries out computing.Comprise: whether then to judge the action period of amount of inlet water, influent COD, influent ammonia nitrogen, DO value, the water outlet ammonia nitrogen factor, when certain Graph One factor arrives the action period, PLC draws the judged result to aeration total amount under this factor currency according to the logical program of this factor, namely judgement higher or on the low side is made, if higher, air quantity lowers certain stride, if on the low side, air quantity raises certain stride;
The judgment formula of amount of inlet water is:
Adjustment amount=water yield difference * gas-water ratio;
The judgment formula of influent COD, ammonia nitrogen is:
If t3=T3;
If C3+A3=0;
Then F2=F2;
If C3+A3 ≠ 0;
Sca＝((C1*C3+5A1*A3)/(C2+5*A2))K2；
If Sca < 0.5, F2=F2-F3;
If 0.5≤Sca≤1.5, F2=F2;
If Sca > 1.5, F2=F2+F3;
t3＝0；
Wherein:
C1-------------------------influent COD measured value
C2-------------influent COD mean value, the analysis data according to a certain period manually sets.If certain month influent COD mean value is 300mg/L, then the setting value of COD mean value is 300mg/L, if certain month influent COD mean value is 1000mg/L, then the setting value of COD mean value is 1000mg/L (general sewage treatment plant inflow COD mean value is between 100-1000mg/L).
C3-------------------influent COD switch, normally gets 1, otherwise gets 0
A1------------------influent ammonia nitrogen measured value
A2------------influent ammonia nitrogen mean value, analysis data according to a certain period manually sets, mean value as certain month influent ammonia nitrogen is 30mg/L, then ammonia nitrogen mean value setting value is 30mg/L, if certain month influent ammonia nitrogen mean value is 80mg/L, then the setting value of ammonia nitrogen mean value is 80mg/L (general sewage treatment plant inflow ammonia nitrogen mean value is between 10-100mg/L).
A3-----------------influent ammonia nitrogen instrument switch, normally gets 1, otherwise gets 0
K2--influent COD, ammonia nitrogen weight coefficient, recommend value to be 0.125
Sca----------------influent COD, ammonia nitrogen add and judgment value
S--------------------always adds and judgment value
T3-------------------influent quality judges the cycle, recommends value 24h
T3-------------------natural time, influent quality timer
DO value judgment formula is:
If t2=T2;
If D1+D2+ ... + D16+C3+A3=0;
Then F2=F2;
If D1+D2+ ... + D16+C3+A3 ≠ 0;
If D1+D2+ ... + D16=0;
Then F2=F2;
If D1+D2+ ... + D16 ≠ 0;
So＝(((O1*D1)/M1+(O2*D2)/M2+…+(O16*D16)/M16)/(D1+D2+…+D16))K1
S＝So
If S < 0.5, F2=F2+F3;
If 0.5≤S≤1.5, F2=F2;
If S > 1.5, F2=F2-F3;
t2＝0。
Wherein: the present embodiment
Oi (i=1,2,3 ... 16)------------1-16 DO instrument value
Mi (i=1,2,3 ... 16)----------------------1-16 DO setting value
Di (i=1,2,3 ... 16)--------1-16 DO instrument switch, the normal Di=1 of DO instrument, otherwise Di=0
K1-----------------------DO weight coefficient, suggestion value is 4
So----------------------DO adds and judgment value
T2----------------------DO judges the cycle, recommends value 2h
T2-----------------------natural time, DO judges timer
Water outlet ammonia nitrogen judgment formula is:
If N3=0, do not perform any operation;
If N3=1;
If t1=T1;
If N2 < is N1, do not perform any operation;
If N2 >=N1 and N2 < N1+1, then F2=F2+F3;
If N2 >=N1+1 and N2 < N1+2, then F2=F2+2*F3;
If N2 >=N1+2 and N2 < N1+3, then F2=F2+3*F3;
If N2 >=N1+3, then F2=F2+5*F3;
If t1=T1 (T1 recommends to get 12h here), then repeat above-mentioned deterministic process;
Wherein:
N1-----------------------water outlet ammonia nitrogen desired value
N2-----------------------water outlet ammonia nitrogen measured value
N3-----------------------water outlet ammonia nitrogen button, 0 is abnormal, and 1 is normal
The current air quantity of F1-----------------------, value of feedback (m
3/ h)
F2-----------------------discharge quantity of fan, controlling value (m
3/ h)
F3--------------------air quantity adjusting range, can manually set (m as required
3/ h)
T1----------------------ammonia nitrogen, because of subcycle, can manually set as required
T1---------------------natural time, water outlet ammonia nitrogen timer
Three, the new airflow value drawn after judgement is transferred to the topworks of fan blower, according to new airflow value adjustment air quantity;
Four, said process circulation is uninterruptedly carried out, to tackle the change of the factors such as real-time water quality and quantity, process conditions.
Described feed water flow flowmeter measurement error is less than 1%; The measuring period of described influent COD instrument, influent ammonia nitrogen on-line computing model is less than 24h, and measuring error is less than 15%; The measuring error of described dissolved oxygen DO on-line computing model is less than 0.1mg/L; The cycle of described water outlet ammonia nitrogen on-line computing model is less than 12h, and measuring error is less than 0.2mg/L.
After described fan blower is connected with center PLC, provide long-range start stop signal address to center PLC or accept long-range start stop signal, air force adjustment Signal Message Address and accept air quantity adjustment signal, and air force signal to be sent on PLC in real time.
Described flowmeter adopts random electromagnetic flowmeter, and its measuring transducer and probe one, be connected with center PLC by communication cable, measuring-signal can be sent on PLC in real time.
Influent COD instrument, ammonia nitrogen on-line computing model, feed water flow gauge, dissolved oxygen DO on-line computing model, water outlet ammonia nitrogen on-line computing model place position conveniently sewage treatment plant obtain and designing requirement arrange.
Refer to Fig. 3, various signal independent judgment, but judgement process likely accidentally reaches action condition simultaneously, need the judged result that execution priority is high in this case, water outlet ammonia nitrogen priority is the highest, air quantity is not adjusted when its measured value is below setting value, according to high degree, air quantity is adjusted by a relatively large margin higher than during setting value; Secondly, influent COD, ammonia nitrogen priority occupy the 3rd to online dissolved oxygen DO priority; The priority that amount of inlet water and other signals perform when reaching the action period is simultaneously minimum, but judges that the cycle is the shortest, and the frequency of execution is the highest, and overall weight is still very high.
Variable relation
The present invention has drawn Derivation of Mathematical Model computing in the past and has shown that theoretical air quantity too relies on the lesson of in-line meter accuracy, relatively independent between each variable, interdependence is less, if 1 or several in-line meters break down or the inaccurate impact on judged result of data is little.
Water outlet ammonia nitrogen, DO value, influent COD and ammonia nitrogen (these two kinds of data on aeration total amount to affect type identical, therefore synthesize a variable) and amount of inlet water four kinds of variablees have primary and secondary point, and interrelated.Four kinds of each own respective regulating cycles of variable, any one variable reaches its regulating cycle and all once can adjust total blast volume, if but had the variable of more than 2 or 2 to reach regulating cycle, then would simultaneously select the highest variable of its medium priority to play a role in epicycle regulates according to the priority of variable in 4.
Below the respective weight of each variable and synthetic relationship are described in detail.
Ammonia nitrogen weight
Air quantity mainly removes COD in sewage and ammonia nitrogen value, and differ greatly due to the removal efficiency of the active sludge in aeration tank to COD and ammonia nitrogen, the microbial species population density removing ammonia nitrogen is often very low, general less than 5%, so active sludge for the removal speed of COD much larger than the removal speed to ammonia nitrogen, therefore can judge when water outlet ammonia nitrogen is well removed that COD is removed already.This theoretical foundation drawing, whether reasonably water outlet ammonia nitrogen value judges aeration rate the highest foundation.
And in actual motion, sewage disposal plant effluent water quality is comparatively limpid, wherein contained interfering material and suspension particle significantly reduce, and therefore the efficient data far above water inlet in-line meter of water outlet ammonia nitrogen data are efficient.Although the ammonia nitrogen of water inlet and COD value are changes, but amount of inlet water is much smaller relative to the volume of reaction tank, therefore entering reaction tank can by dilution at once 4-8 times, this makes reaction tank be provided with certain impact resistance, thus makes the oxygen demand of reaction tank can keep relatively steady within certain period.
Under the support of above water treatment theory, can show that the first ring of Logic judgment first analyzes water outlet ammonia nitrogen value, also namely represent that water outlet ammonia nitrogen value is whether reasonably system judges air quantity highest weight weight values.In other words, also can think that water outlet ammonia nitrogen value all should within range of control under normal circumstances, water outlet ammonia nitrogen reaches setting value to rely on the regulation and control of its dependent variable generally can ensure, then illustrate that the regulating power of other variable is beyond the limit as water outlet ammonia nitrogen exceeds setting value, and now need significantly to adjust air quantity, therefore the adjustment of water outlet ammonia nitrogen is by a relatively large margin.
According in " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) to municipal sewage plant's water quality discharge requirement, in one-level A standard, require water outlet ammonia nitrogen < 5mg/L, in one-level B standard, require water outlet ammonia nitrogen < 8mg/L.Current part of contaminated water treatment plant performs one-level A standard, and some sewage treatment plant performs one-level B standard.Therefore, for guaranteeing that water outlet ammonia nitrogen value up to standard must have certain surplus within standard.Therefore the desired value of ammonia control is set to the variable that manually can input amendment, be defined as N1, be set to 1mg/L according to the operating experience of sewage treatment plant at the sewage treatment plant N1 performing one-level A standard comparatively reasonable, be set to 3mg/L at the sewage treatment plant N1 performing one-level B standard comparatively reasonable.
Whether Operation system setting water outlet ammonia nitrogen value participates in manual control switch's button of computing, can manually close when water outlet ammonia nitrogen instrument is abnormal, and instrument is manually opened after recovering normal operation more by the time.For Zhang Guizhuan sewage treatment plant, water outlet ammonia nitrogen desired value is set as 1mg/L, if measured value is less than desired value, then epicycle water outlet ammonia nitrogen variable does not make adjustments, adjustment power transfers to other controlling elements, if measured value is greater than 1mg/L but be less than 2mg/L, then air quantity increases 1 stride, if measured value is greater than 2mg/L but be less than 3mg/L, air quantity increases 2 strides, if measured value is greater than 3mg/L, air quantity increases 5 strides.The adjustment cycle of water outlet ammonia nitrogen is 12 hours.
DO weight
General sewage treatment plant reaction tank all arranges dissolved oxygen DO on-line computing model, and the quantity only arranged is different.Relative to water outlet ammonia nitrogen, reaction tank DO is the reaction of aeration effect equally, but DO belongs to process values, controls aeration rate then validity more sometimes, therefore when water outlet ammonia nitrogen value is less than setting value, then become attach most importance to DO to the control of aeration total amount by DO.
Dissolved oxygen DO is as the term suggests be exactly the concentration of the oxygen dissolved in reaction tank mixed liquor, and this concentration is the mobile equilibrium value that the oxygenation capacity of fan blower aeration and active sludge consume oxygen.The control of DO is the most important thing for the treatment effect of biological tank, and the different functional areas of reaction tank have different DO values to require [54].Current reaction tank generally adopts biological denitrification phosphorous removal technique, is divided into anaerobic zone, oxygen-starved area and aerobic zone in technological process.
The apparent DO value in anaerobic zone is 0, and also there is not the nitrate radical, nitrite anions etc. of oxidation state, oxidation-reduction potential is generally below-300mV simultaneously; The apparent DO value in oxygen-starved area is also 0, but there is the very strong ion of the oxidisability such as a large amount of nitrate radicals, nitrite anions, and oxidation-reduction potential is generally at about 0-100mV; The apparent DO value in aerobic zone is greater than 0, and there is the oxygen of solubilised state and the ion of oxidation state, oxidation-reduction potential is generally greater than 100mV simultaneously, and DO value general control is at about 2mg/L.And DO instrument is generally arranged on the end of aerobic zone, DO here will control at 0.5-1mg/L, because and then aerobic zone is exactly oxygen-starved area after terminating, if end DO is too high, can have a strong impact on the reaction effect of oxygen-starved area.And this DO value is also the desired value of Systematical control aeration total amount.
DO instrument quantity is more, has the instrument of abnormal state unavoidably, and judges that whether enough a certain moment aeration total amount only needs to see that DO has been higher or on the low side generally, does not require that all DO instrument are all normal.Therefore arrange the shift knob of DO instrument, switch can be set to cut out by any instrument extremely, thus does not participate in computation process.
Based on above technology theory, the weight of DO is only second to water outlet ammonia nitrogen value and occupies the 2nd, for increasing its weight proportion, the measured value of each DO instrument does result that a power operation draws again as regulatory factor after getting arithmetic mean divided by the ratio of respective setting value, do 4 power computings according to service condition comparatively reasonable, the regulating cycle of DO is 2 hours.
Influent COD, ammonia nitrogen weight
Influent COD, ammonia nitrogen are significantly diluted in reaction tank due to it, and therefore they are relatively weak on the impact of aeration total amount.And the calculating of these two data can adopt the water inlet in the regular period to chemically examine mean value as ratio denominator, judge whether the influent quality in a certain moment surpasss the expectation.If surpass the expectation, a ratio can be drawn with mean value, then control when this ratio is greater than setting range the air quantity that fan blower increases a stride, if lower than desired value PLC, instruction can be sent and control the air quantity that fan blower reduces a stride.The weight proportion of this variable is minimum, and the arithmetic mean of its ratio will do result that an extracting operation draws as regulatory factor, and open 4 power computings according to service condition comparatively reasonable, the regulating cycle of influent COD, ammonia nitrogen is 24 hours.
Flow of inlet water weight
Amount of inlet water is independent of other all controlling elements above, the regulation time of the water yield recommends value 0.5h, and generally can not there is large change in water quality in this regulation time, the adjustment can thinking at this moment becomes the linear relationship of the simple water yield and air quantity, if larger change occurs for influent quality or other condition, then can pass through manual amendment's " gas-water ratio " parameter thus affect the regulated quantity [57] of the water yield factor.Gas-water ratio, as the term suggests the ratio being exactly aeration rate and the water yield, characterizes the relation between blast aeration amount and inflow by this parameter in sewage treatment process, the important Con trolling index that Ye Shi sewage treatment plant runs.This parameter is metastable when influent quality changes little, but different because of factory, needs the operations staff of our factory to carry out rational allocation to the gas of this factory and water ratio.Therefore native system adopts the mode of the artificial setting and modifying of gas-water ratio, regularly revises this parameter by process engineer.Automatic program then carrys out the change between the linear calculating water yield and tolerance according to the parameter of artificial setting, thus realizes regulating aeration rate [58,59] in real time according to water yield change.Although the water quantity regulation factor is relatively independent, the phenomenon that the unavoidable regulating cycle that its regulating cycle and other variable occur that is in operation clashes, runs into the priority of this situation amount of inlet water regulatory factor higher than other regulatory factor.The regulating cycle of flow of inlet water is 0.5 hour.
Each variable relation summary
In fact whole system is using the setting value of water outlet ammonia nitrogen as the target controlled, the regulation and control of DO can meet the up to standard of ammonia nitrogen under normal circumstances, and in-line meter of intaking generally is difficult to ensure normal operation, when there being upstream to discharge existing significantly water quality load impact steathily, often make water outlet ammonia nitrogen value increase fast, therefore just need when ammonia nitrogen value rises fast the blow rate required to be improved.So although the regulation and control of water outlet ammonia nitrogen are infrequently worked, when tackling abnormal conditions, there is quick-adjustsing effect, improve the security that whole system is run.
Reaction tank has 16 DO instrument, and whether abundance does not require that 16 DO are accurate to react total aeration rate, be in operation find that there is half DO keep normal condition can meet regulation and control needs.When water outlet ammonia nitrogen is less than setting value, the weight of DO is maximum, because it is that aeration rate whether the most directly feed back by abundance, has wherein contained the factor of the influent quality water yield, if influent quality water yield amplitude of variation is little, the adjustment of DO is only relied on to satisfy the demand.
Therefore, the influent quality water yield and the regulation and control of water outlet ammonia nitrogen can make up the relative little shortcoming of the degree of control of DO, the regulation and control stride of DO can be reduced as far as possible, improve the precision of regulation and control, have again making up of other regulatory factor when the regulation and control of DO can not be satisfied the demand, the security that whole system is regulated and controled improves simultaneously.Just these four kinds of regulatory factors combination and make up mutually, make the control accuracy of system and impact resistance be obtained for raising.
Refer to accompanying drawing 2,3, on the basis of clear and definite variable relation, the logical program of system is divided into two relatively independent judgement flow processs.
As Fig. 2 judges according to influent quality, process DO, water outlet ammonia nitrogen, think that air quantity is less than normal if judge, center PLC can increase a stride according to current air quantity and draw the airflow value after adjustment and be translated into new current air volume signal and send topworks to; Think that air quantity place in the reasonable scope if judge, then the air volume signal sending topworks to remains unchanged; Think that air quantity is bigger than normal if judge, center PLC can reduce a stride according to current air quantity and draw the airflow value after adjustment, and is translated into new current air volume signal and sends topworks to.
As Fig. 3, judge according to amount of inlet water situation of change, adjustment cycle is determined by the timer in an adjustable cycle, because different sewage treatment plants has different water yield variation factor, each sewage treatment plant can adjust this judgement cycle according to the water yield situation of change of self, cycle original records water yield data, the end of term in week also records a water yield data, the coefficient being multiplied by a gas-water ratio according to the difference of these two data obtains the adjusted value of air quantity, and changes into final air volume signal and send topworks to.
Exist though these two kinds of deterministic processes are independent, run into the situation of action simultaneously in the process of implementation unavoidably, if this thing happens, the water yield judges that process stops once, and the preferential water quality that performs judges process.
Data Comparison before the present invention uses and after using
As Fig. 4, inflow history curve, before system puts into operation, aeration total amount is by adjusting manually, and the most multipotency of adjustment process frequency is accomplished to regulate for 1 day 1, and the actual inflow of sewage treatment plant often just has change by a relatively large margin for several hours.As shown in Fig. 4-3, be that the inflow curve of 10 days gathers in figure, can find out that the water yield change of every day all exists peak and low ebb, the peak water yield and nearly 1 times of low ebb water yield difference in one day, if gas-water ratio is fixed, aeration rate also should differ 1 times, and obviously adjustment once a day can not adapt to the characteristic of the sewage treatment plant inflow water yield.
As Fig. 5, the water outlet ammonia nitrogen situation before system comes into operation, before system puts into operation, delayed due to what regulate, water outlet ammonia nitrogen also shows unstable trend, is low to moderate below 0.5mg/L during water outlet ammonia nitrogen, more than Shi Ergao to 4mg/L, even has the risk exceeded standard.This is because the water yield significantly changes, the adjustment of air quantity is not caught up with, nitrobacteria in biological reaction pool, time and oxygen is excessive, time and oxygen is not enough, the nitrification efficiency of active sludge is had a greatly reduced quality, simultaneously in order to ensure the water outlet ammonia nitrogen qualified discharge when the high water yield, generally in this case, ammonia nitrogen when most of process engineer can look after the high water yield is up to standard, therefore overall air quantity adjustment can be higher, and do not adjust in time when the water yield is low and still adopt high air quantity to run, this brings very large energy dissipation undoubtedly.
As shown in Figure 6 and Figure 7, the DO situation before system comes into operation, there is situation about fluctuating widely from 0.5mg/L to 3.5mg/L in online DO, expensive carbon source expense is not only wasted when high DO, increase carbon source dosage, waste aeration rate simultaneously, increase power consumption.
As Fig. 8,9, the water outlet ammonia nitrogen situation after system comes into operation, can find out before water outlet ammonia nitrogen comparatively steady a lot, amplitude of variation reduces greatly, improves the stability of effluent quality, to guaranteeing that the stably reaching standard effect of water quality is obvious.
As Figure 10-12, DO situation after system comes into operation, the trend curve of the online DO data of biological reaction pool can find out the stability significantly improving biological tank DO after system comes into operation, and efficiently solves the difficult problem that aeration rate when the water yield and water quality change is difficult to harmonize.Avoid the waste of aeration rate, improve the efficiency of energy utilization, decrease the waste of idle work.
COD in sewage and ammonia nitrogen are removed in the effect of aeration, and remove ammonia nitrogen and relatively remove COD and want difficult, reason is that the microbial species population density removing ammonia nitrogen carried out with regard to starting before ammonia nitrogen removal occurs well below the removal reaction of the population density and COD of removing COD, if therefore ammonia nitrogen can drop to very low level, then can think that COD has been reduced to very low level.Using the basis for estimation one of of water outlet ammonia nitrogen online data as system, when ammonia nitrogen provides the judgement increasing air quantity higher than system during setting value, otherwise online DO is then transferred to judge; Influent COD, ammonia nitrogen, flow are the second independently deterministic processes, and these three kinds of parameter impacts on aeration total amount are linear, are also independently.Two kinds of deterministic processes are carried out simultaneously, and distribute priority and weight respectively, jointly realize the optimal control of aeration total amount, aeration total amount are adjusted in real time and level off to the most rational level, thus reaching the situation of doulbe-sides' victory energy-conservation and up to standard.Reaction tank has multiple stage dissolved oxygen DO on-line computing model (be called for short DO instrument), and abundance portion DO instrument of not demanding perfection is all accurate to react total aeration rate, has DO instrument over half to keep normal condition can meet regulation and control needs.The adjustment of the influent quality water yield can make up the hysteresis quality problem existed when DO regulates, regulation and control in conjunction with water outlet ammonia nitrogen can make up the relatively little shortcoming of the degree of control of DO, the regulation and control stride of DO can be reduced as far as possible, improve the precision of regulation and control, have again making up of other regulatory factor when the regulation and control of DO can not be satisfied the demand, the security that whole system is regulated and controled improves simultaneously.Just these four kinds of regulatory factors combination and make up mutually, make the control accuracy of system and impact resistance be obtained for raising.
The factor of feed-forward regulation has: amount of inlet water, influent COD, influent ammonia nitrogen;
The process feedback factor has: online dissolved oxygen meter (DO instrument), generally establishes multiple stage;
The terminal feedback factor has: water outlet ammonia nitrogen.
Influent COD and influent ammonia nitrogen can merge into influent quality regulatory factor, add amount of inlet water regulatory factor, DO regulatory factor, and water outlet ammonia nitrogen regulatory factor amounts to four kinds of regulatory factors.
The measurement range of influent COD instrument: 10 ~ 5000mg/lCOD, measuring accuracy is 5mg/L, digestion time: optional 3,5,10,20,30,40,60,80,100 or 120 minutes optional, interval time of measurement: 3,4 ... 24 hours or continuous, also can trigger instrument by MODBUS.Signal exports and adopts analog current to export: 0/4-20mA, maximum load 500 Ω.Instrument carries MODBUS communications protocol simultaneously, can carry out the communication of digital signal, instrumental working conditions temperature requirement+5 DEG C ~+40 DEG C.The main operational principle of influent COD instrument is acid total potassium chromate method, by the control of a series of valve and gauge line, draw quantitative water sample to reaction chamber, draw the total potassium chromate solution of quantitative acidity again, mercuric sulfate solution waits until reaction chamber, then mix, mixed liquor is heated to 150 DEG C, reaction 15-60 minute, this reaction time can manual shift according to the situation of concrete water sample, the reaction time of selecting when general water sample COD content is lower is also relatively short, then selects the longer reaction time during COD content height.After reaction terminates, start colorimetric device and colorimetric analysis is carried out to it, by the computing formula prestored in instrument, draw the COD concentration of water sample according to absorbance and export.The present embodiment influent COD instrument adopts the CODmax type in-line meter of Hach company of the U.S..
Influent ammonia nitrogen on-line computing model is identical with water outlet ammonia nitrogen on-line computing model model.
Feed water flow gauge adopts ABB electromagnetic flowmeter, and flowmeter amounts to 16, and system is in operation and gets the total value of 16 flowmeters.Flowmeter measurements error is 0.4%, and nominal size is DN400, adopts flange connection method to be connected with pipeline, nominal pressure is PN10, be the run by gravity of full packages in actual condition down-off, liner adopts the PTFE of DN350, conductance >5 μ S/cm.Biological reaction pool has 16 water inlet pipes, each water inlet pipe is furnished with an electromagnetic flowmeter, 16 flowmeters by local PLC add and, draw a total flow, this total flow is exactly the flow basis for estimation of system.Dissolved oxygen DO on-line computing model comprises transmitter and probe, and this instrument adopts photovoltaic principals to carry out the mensuration of DO value, and instrument is stable, and DATA REASONING is accurate, the DO situation in the mensuration biological reaction pool that online measuring sonde can be real-time.Dissolved oxygen DO on-line computing model adopts the sc1000 type dissolved oxygen DO on-line computing model of Hach company of the U.S., its measurement range is 0-20mg/L, measuring accuracy is 0.01mg/L, operating temperature range is 0-50 DEG C, and the reaction time 90%, 95% in 60 seconds in 40 seconds, probe depth of immersion and the highest 107m or 1050kPa of pressure limit, sensor communication agreement is Modbus, and sensor, to the minimum flow no requirement (NR) of measuring fluid, can complete measurement accurately in static liquid.Mode signal output is 4-20mA simulating signal, and measured value is transferred to on-the-spot PLC with the signal of 4-20mA by transmitter again, and on-the-spot PLC is transferred to central control room by optical fiber in the mode of digital signal.
Water-in and water-out ammonia nitrogen on-line computing model mainly comprises RFIO plate, MPIO plate, PC104 plate, power panel and detecting unit etc., is responsible for control respectively, stores, chemically examines the functions such as operation.The present embodiment adopts the ammonia nitrogen instrument of Italian systea, its measurement range is 0-20mg/L, and measuring accuracy is 0.1mg/L, and the Na's reagent in this ammonia nitrogen instrument simulation water quality monitoring method measures ammonia nitrogen, measure the time once needing 15min, measurement data accurately and reliably.Its data transfer mode can adopt the mode of 4-20mA to transmit, also the digital transmission mode of 485 interfaces can be adopted to export data, instrumental transmission gives the on-the-spot PLC 4-20mA signal adopted, be sent to central control room by optical-fibre communications after on-the-spot PLC is translated into digital signal, system then intercepts ammonia nitrogen signal on the input end of central control room.
Feedforward control, process feedback, terminal feedback combine by the present invention, introduce the theory of fuzzy control, various regulatory factor should not be how many directly to air output, and only judge that current air quantity has been higher or on the low side, according to this judgement, total blast volume is carried out to reduction or the increase adjustment of certain stride again, make aeration total amount level off to reasonable value by the adjustment in several cycle, also make aeration total amount again be tending towards reasonable value by the adaptation in several cycle when larger change occurs for water water quality and quantity or technological process.The many instrument of multiple-factor are relatively independent to work, and every platform instrument arranges switch in PLC control program, can close separately and do not affect the deterministic process of other factors when data exception and fault.
Method main points of the present invention are: operating for sewage treatment plant factor of influence is defined as five, by by the technological principle of these five kinds of factors of influence and the multi-disciplinary combination of auto-adaptive control theory, have developed the logical relation that aeration total amount accurately controls; Five kinds of factors of influence are divided into again four classes, all distribute weighing factor and regulating cycle according to sewage treatment process principle by all kinds of factor, work respectively and participate in the regulation and control of air quantity; Every class factor of influence specifically should be how many to air output, but judges that current air quantity has been higher or on the low side, provides the instruction tuning up or turn down, makes air quantity automatically close to most reasonable value.Influent quality, amount of inlet water, online DO, water outlet ammonia nitrogen four kinds of Variable Factors are all relevant with aeration total amount, and wherein influent quality and amount of inlet water are the causes of aeration total amount, and online DO and water outlet ammonia nitrogen are the consequences of aeration total amount.Because the simple feedforward control of uncertainty of influent quality and water yield change often brings relatively large deviation, and simple FEEDBACK CONTROL also can cause the deviation of control due to its hysteresis quality.Various Variable Factors individually controls aeration total amount according to after its influence degree to aeration total amount unified distribution weight, can play the effect of mutual supplement with each other's advantages, and control effects then can be more reasonable effective.Such as according to water yield change adjustment aeration total amount in time, the acute variation of data when pure DO can be avoided to control, makes DO value more tend to be steady; And for example the reasonably stability of DO value is conducive to the stable of water outlet ammonia nitrogen, because the hydraulic detention time water outlet ammonia control cycle considering biological treatment system is 12h, the stable validity then controlled for this long period of water outlet ammonia nitrogen value provides possibility.Water outlet ammonia nitrogen reaches the significantly adjustment of high level conversely, be then to the correction that DO controls and amount of inlet water controls, prevent the phenomenon of overproof water quality.
The present invention and theoretical formula are before derived compared with the robot control system(RCS) that calculates, and the stability of operation obtains and significantly improves.From the effect of system cloud gray model, greatly reduce the fault of separate unit instrument or measuring error to the impact of system judged result, whole system relies on 20 in-line meters, and except water outlet ammonia nitrogen on-line computing model, any instrument fault all can not bring too large impact to system stable operation.
The instrument that the present invention uses is the conventional instrument of general sewage treatment plant, according to the requirement of country to sewage treatment plant's in-line meter, water inlet and water outlet arranges COD on-line computing model, ammonia nitrogen on-line computing model is necessary, and nearly all sewage treatment plant all can arrange online DO instrument, therefore, the present invention can be widely used in other sewage treatment plant, and hardware condition possesses completely.System data acquisition amount is also little, and the output of control signal only controls a kind of equipment, and adjusted the technique of target sewage treatment plant and corresponding parameter by the process engineer of specialty, system is easy to be adjusted to the privileged system for target sewage treatment plant.Putting into operation of system improves the stability of sewage treatment plant's operation, reduces power consumption and the medicine consumption of sewage treatment plant's operation while improve water quality treatment index.Save power more than 200 ten thousand degree can be realized by system every year in the ruuning situation of Zhang Guizhuan sewage treatment plant, save added amount of chemical more than 1000 ton, amount to annual saving operating cost more than 400 ten thousand yuan, realize carbon dioxide discharge-reduction more than 2300 ton.The enforcement of multiple precise controlling measure simultaneously also makes sewage treatment plant's treatment effect be further improved, and effluent quality is close to IV class water quality index, and comparatively one-level A standard turn improves a grade.
Above-mentioned detailed description of carrying out with reference to the accuracy control method of embodiment to this kind of sewage treatment plant aeration total amount; illustrative instead of determinate; several embodiments can be listed according to institute's limited range; therefore in the change do not departed under general plotting of the present invention and amendment, should belong within protection scope of the present invention.
Claims (4)
1. the accuracy control method of sewage treatment plant's aeration total amount, it is characterized in that: conveniently sewage treatment plant obtains and designing requirement arranges influent COD instrument, ammonia nitrogen on-line computing model, feed water flow gauge, dissolved oxygen DO on-line computing model, water outlet ammonia nitrogen on-line computing model is placed and some fan blowers, set up central control room (CCR), by above-mentioned Instrument connection on the PLC of center, influent COD instrument, ammonia nitrogen on-line computing model, feed water flow gauge, dissolved oxygen DO on-line computing model is connected with water outlet ammonia nitrogen on-line computing model Hou Yu center PLC in parallel, described center PLC is connected with some fan blowers, described center PLC gathers four kinds of variable signal respectively with independent regulation cycle and the amplitude of accommodation respectively, namely water outlet ammonia nitrogen, DO value, influent COD and ammonia nitrogen, amount of inlet water have dividing of primary and secondary, and the four kinds of variable signal that are mutually related again, four kinds of variable signal are by center PLC unified allocation of resources and then mutually cover the shortage, and form the accuracy-control system that center PLC controls adjustment fan blower total blast volume,
Concrete control method step is as follows,
One, amount of inlet water, influent COD, influent ammonia nitrogen, DO value, water outlet ammonia nitrogen, blower air quantity signal input center PLC;
Two, center PLC carries out computing, comprise: whether then to judge the action period of amount of inlet water, influent COD, influent ammonia nitrogen, DO value, the water outlet ammonia nitrogen factor, when certain Graph One factor arrives the action period, center PLC draws the judged result to aeration total amount under this factor currency according to the logical program of this factor, namely judgement higher or on the low side is made, if higher, air quantity lowers certain stride, if on the low side, air quantity raises certain stride;
The judgment formula of amount of inlet water is:
Adjustment amount=water yield difference * gas-water ratio;
The judgment formula of influent COD, ammonia nitrogen is:
If t
3=T
3;
If C
3+ A
3=0;
Then F
2=F
2;
If C
3+ A
3≠ 0;
S
ca＝((C
1*C
3+5A
1*A
3)/(C
2+5*A
2))
K2；
If S
ca< 0.5 F
2=F
2-F
3;
If 0.5≤S
ca≤ 1.5 F
2=F
2;
If S
ca> 1.5 F
2=F
2+ F
3;
t
3＝0；
Wherein:
C
1--------------influent COD measured value
C2-------------influent COD mean value
C3---------------------influent COD switch, normally gets 1, otherwise gets 0
A1---------------------influent ammonia nitrogen measured value
A2-------------influent ammonia nitrogen mean value
A
3---------------influent ammonia nitrogen instrument switch, normally gets 1, otherwise gets 0
K
2--influent COD, ammonia nitrogen weight coefficient
S
ca-----------------------influent COD, ammonia nitrogen add and judgment value
S-------------------------always adds and judgment value
T
3-----------------------influent quality judges the cycle, recommends value 24h
T
3-----------------------natural time, influent quality timer
DO value judgment formula is:
If t
2=T
2;
If D
1+ D
2+ ... + D
16+ C
3+ A
3=0;
Then F2=F2;
If D
1+ D
2+ ... + D
16+ C
3+ A
3≠ 0;
If D
1+ D
2+ ... + D
16=0;
Then F
2=F
2;
If D
1+ D
2+ ... + D
16≠ 0;
S
o＝(((O
1*D
1)/M
1+(O
2*D
2)/M
2+…+(O
16*D
16)/M
16)/(D
1+D
2+…+D
16))
K1
S＝S
o
If S < 0.5, F
2=F
2+ F
3;
If 0.5≤S≤1.5, F
2=F
2;
If S > 1.5, F
2=F
2-F
3;
t
2＝0；
Wherein:
O
i(i=1,2,3 ... n)-----------------1-n DO instrument value
M
i(i=1,2,3 ... n)------------------1-n DO setting value
D
i(i=1,2,3 ... n)--------1-n DO instrument switch, the normal D of DO instrument
i=1, on the contrary D
i=0
K
1-------------------------------DO weight coefficient, suggestion value is 4
S
o--------------------------------DO adds and judgment value
T
2---------------------------------DO judges the cycle, recommends value 2h
T
2-----------------------------------natural time, DO judges timer
Water outlet ammonia nitrogen judgment formula is:
If N
3=0, do not perform any operation;
If N
3=1;
If t
1=T
1;
If N
2< N
1, do not perform any operation;
If N
2>=N
1and N
2< N
1+ 1, then F
2=F
2+ F
3;
If N
2>=N
1+ 1 and N
2< N
1+ 2, then F
2=F
2+ 2*F
3;
If N
2>=N
1+ 2 and N
2< N
1+ 3, then F
2=F
2+ 3*F
3;
If N
2>=N
1+ 3, then F
2=F
2+ 5*F
3;
If t
1=T
1, then above-mentioned deterministic process is repeated;
Wherein:
N
1------------------------------------water outlet ammonia nitrogen desired value
N
2------------------------------------water outlet ammonia nitrogen measured value
N
3--------------------------------water outlet ammonia nitrogen button, 0 is abnormal, and 1 is normal
F
1--------------------------------current air quantity, value of feedback (m/h)
F
2--------------------------------discharge quantity of fan, controlling value (m/h)
F
3--------------------------air quantity adjusting range, can manually set (m/h) as required
T
1-------------------------------ammonia nitrogen, because of subcycle, can manually set as required
T
1--------------------------------natural time, water outlet ammonia nitrogen timer
Three, the new airflow value drawn after judgement is transferred to the topworks of fan blower, according to new airflow value adjustment air quantity;
Four, said process circulation is uninterruptedly carried out, to tackle the change of real-time water quality and quantity, process conditions factor.
2. the accuracy control method of sewage treatment plant according to claim 1 aeration total amount, is characterized in that: described feed water flow flowmeter measurement error is less than 1%; The measuring period of described influent COD instrument, influent ammonia nitrogen on-line computing model is less than 24h, and measuring error is less than 15%; The measuring error of described dissolved oxygen DO on-line computing model is less than 0.1mg/L; The cycle of described water outlet ammonia nitrogen on-line computing model is less than 12h, and measuring error is less than 0.2mg/L.
3. the accuracy control method of sewage treatment plant according to claim 1 and 2 aeration total amount, it is characterized in that: after described fan blower is connected with center PLC, there is provided long-range start stop signal address to center PLC or accept long-range start stop signal, air force adjustment Signal Message Address and accept air quantity adjustment signal, and air force signal to be sent on PLC in real time.
4. the accuracy control method of sewage treatment plant according to claim 3 aeration total amount, it is characterized in that: described flowmeter adopts random electromagnetic flowmeter, its measuring transducer and probe one, be connected with center PLC by communication cable, measuring-signal can be sent on PLC in real time.
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2014
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