CN107298484A - The SBR deep denitrification methods of municipal sewage nitric efficiency are improved using ammonia nitrogen - Google Patents
The SBR deep denitrification methods of municipal sewage nitric efficiency are improved using ammonia nitrogen Download PDFInfo
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- CN107298484A CN107298484A CN201710484732.6A CN201710484732A CN107298484A CN 107298484 A CN107298484 A CN 107298484A CN 201710484732 A CN201710484732 A CN 201710484732A CN 107298484 A CN107298484 A CN 107298484A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/04—Oxidation reduction potential [ORP]
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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Abstract
The SBR deep denitrification methods for improving municipal sewage nitric efficiency using ammonia nitrogen belong to technical field of sewage, it is adaptable to city sewage deep denitrogenation processing.The raw water total amount that the present invention pre-processes the SBR cycles is filled with reactor in two times.First time filled water amount, which is accounted for, is aerated operation after the major part of cycle pending total Water, water-filling, by DO, pH On-line Control nitrifying process；Second of water-filling is carried out after nitrification terminates, and adds appropriate outer carbon source stirring operation, by pH, ORP On-line Control denitrification process.Kelvin nitrogen concentration, denitrogenation processing target and total water-filling ratio-dependent of the ratio of water-filling according to processed raw water twice.Second of water-filling provides appropriate ammonia nitrogen to promote denitrification process, and take into account the ammonia nitrogen supplemented for denitrification in proper amount of carbon source, water-filling to be partially removed in denitrification without influenceing effluent quality without aerobic section for denitrification section.The present invention is compared with denitrification system of the denitrification section without ammonia nitrogen, with notable synergistic, energy-conservation and consumption reduction effect.
Description
Technical field
The invention belongs to technical field of sewage, and in particular to a kind of utilization ammonia nitrogen improves municipal sewage nitric efficiency
SBR deep denitrification methods.
Background technology
With economic development and the quickening of urbanization process, city is continuously increased to the demand of water resource, is developed
Municipal sewage, achieves recycling, for ensureing that it is great that urban safety water supply and the sustainable use of environmental resource have
Strategic importance.At present, it is still quality problem to limit the dirty, main bottleneck of waste water recycling, and for the reuse of municipal sewage, it is first
Problem is wanted to make sure that the up to standard of municipal sewage plant effluent nitrogen phosphorus.Phosphorus in sewage can generally be removed using method for dosing medicine, but
Nitrogen in sewage is smaller due to the molecular weight of its compound, typically can not be using adding medical method removal.Using reverse osmosis membrane skill
Art is denitrogenated, although method is effective, but costly, it is difficult to promote.Therefore, effective removal of nitrogen is the difficult point of advanced treatment of wastewater
And emphasis.The biological denitrificaion of sewage, is presently the most economical and effective and uses extensive treatment technology, how further to improve existing
Row biological denitrification process efficiency, researchs and develops the biological denitrificaion new method and new technology of economical and efficient, is urgently to be resolved hurrily important
Problem.
At present, wide variety of biological denitrification process is still built upon in traditional biological denitrogenation theoretical foundation in engineering
Group technology, is the spatial order continuous flow process of representative and using SBR techniques as between the time sequencing of representative such as with anoxic/aerobic
Have a rest stream technique.Particularly SBR techniques, due to its method of operation flexibly, aerobic, anoxic and anaerobic state can be realized as needed
Alternate environmental condition, it has also become with respect to the denitrogenation technology of continuous flow process advantageously.
Biological denitrification process is broadly divided into two-step reaction process, that is, it is nitre state to first pass through aerobic nitrification effect by ammonium oxidation
Nitrogen (nitrate nitrogen and nitrite nitrogen), is then acted on by anoxic denitrification, by electron donor of organic matter by nitrate nitrogen again
Nitrogen is reduced to, final nitrogen is escaped from water.
When carrying out advanced nitrogen using SBR techniques, its basic method of operation is typically：Raw water enters after system, first leads to
The organic matter that aerobic operation is gone in water removal is crossed, and is nitrate nitrogen by ammonium oxidation, that is, carries out nitration reaction；Then again by adding
Appropriate carbon source, under conditions of anoxia stirring, completes the denitrification denitrogenation course of reaction that nitrate-nitrogen reduction is nitrogen.Obviously,
People are generally not intended to also there are not itrated ammonia and nitrogen components in denilrification system, because this is often believed to influence system
Water quality after system processing.
However, this seminar finds more recently by experiment, if there is there is appropriate ammonia and nitrogen components in denilrification system
(ammonia-nitrogen content, which is more than, is reduced degraded nitrate nitrogen amount more than 9%), can be remarkably reinforced the activity of denitrifying bacterium, and then significantly improve
Denitrification rate, and during denitrification degraded nitrate nitrogen, moreover it is possible to while degraded accounts for the nitrate nitrogen amount for being reduced degraded
The ammonia and nitrogen components of more than 8% (average).
In order to optimize the denitrification process of SBR techniques, the present invention provides one kind and improves municipal sewage nitric efficiency using ammonia nitrogen
SBR deep denitrification methods.
The content of the invention
Discovery of the present invention based on " appropriate ammonia nitrogen has to standard biologic denitrification process is obviously promoted effect ", and tie
Close " in pH, DO (dissolved oxygen) and ORP (oxidation-reduction potential) parameter On-line Control SBR denitrification process method ", by entering one
Step repetition test research and development are formed, it is therefore an objective to further excavated the denitrogenation potential of conventional SBR technique, improved nitric efficiency.
The basic foundation of the present invention
(1) when appropriate ammonia and nitrogen components (be more than and be reduced degraded nitrate nitrogen amount more than 9%) are there are in denitrification process, energy
Enough denitrification rate is set to have a more substantial increase；
(2) in the anti-nitre system of biological denitrificaion contain ammonia nitrogen when, denitrification process in addition to deoxidization, degradation nitrate nitrogen composition,
The ammonia and nitrogen components for nitrate nitrogen amount more than 8% (average) that account for being degraded can be also removed simultaneously；
(3) at the end of SBR nitration reactions, obvious characteristic point can occur on pH the and DO duration curves of on-line monitoring
Indicated at the end of SBR anti-nitration reactions, obvious spy can also occur on pH the and ORP duration curves of on-line monitoring
Levy and a little indicated.
Application claims sbr reactor device and its control device have following characteristics
Sbr reactor device is connected with water inlet pipe, carbon source and adds pipe, aeration tube, outlet pipe and discharge pipeline；Sbr reactor device is by entering
Water pump supplies water through water intaking valve, water inlet pipe, adds pump by carbon source and adds valve, carbon source through carbon source and add pipe and adds carbon source, by air blower
It is aerated through being aerated intake valve, aeration tube；Corresponding draining valve and row are also provided with sbr reactor device outlet pipe and discharge pipeline
Slurry valve.
Agitator, liquid level sensor, pH sensors, DO sensors and ORP sensors are provided with sbr reactor device；Liquid
The detection signal of level sensor and pH, DO, ORP sensor is connected after distinguishing sampled, conversion and processing with controller.According to pre-
The system operation control strategy first set, is implemented in line traffic control by the relay in process controller to the running of system
System.
The control parameter of system operation has：Total water-filling ratio δ in sbr reactor device cycle, the filled water amount twice in a cycle are accounted for
The ratio lambda of total filled water amount1And λ2(water-filling scheme), filling time t1And liquid level H during end water-filling in reactor1, it is aerobic
During pH and DO signals sampling interval t2, secondary filling time t3, carbon source add time t4, terminate water-filling and add carbon source
When reactor in liquid level H2, in whipping process pH and ORP signals sampling interval t5, ORP is average to the time at the end of denitrification
Rate of change KORPiCritical value K when reducing suddenlyORPk, short-time aeration time t6, sedimentation time t7, water discharge time t8, sludge-drainage time
t9, standby time t10Deng.
Each procedure of course of reaction, includes the keying of various pumps and valve, and the keying of aeration and stirring system is filled
Water, the process such as carbon source, draining, spoil disposal, idle is added, can be controlled to complete by control system real-time online according to control strategy.
Technical scheme
According to above-mentioned basic foundation, Basic practice of the invention is：It is divided to two by the raw water total amount of SBR each cycle predetermined process
It is secondary to be filled with reactor.The filled water amount of first time water-filling accounts for the major part of reactor cycle pending raw water total amount；Second of water-filling
Carried out after aerobic nitrification reaction terminates, filled water amount is remaining reactor cycle pending raw water；According to control strategy by pH,
DO parameter onlines and control SBR aerobic nitrification processes, by pH, ORP parameter online and control SBR anoxic denitrification mistakes
Journey.The ratio lambda of water-filling twice1And λ2Can be according to the kelvin nitrogen concentration S of processed raw wateroNWith the processing target S of denitrogenationeNIt is determined that
(concrete scheme is seen below).
The main purpose of second of water-filling is to provide appropriate ammonia nitrogen source for the denitrification process of denitrogenation to promote denitrification
Process, and this part ammonia nitrogen is partially removed without aerobic nitrification process without influenceing effluent quality, while taking into account to be anti-
The Nitrification supplements corresponding carbon source, so as to realize the purpose of synergy, energy-conservation and consumption reduction.
After initialization system operational parameter control, the basic fundamental work for the sbr reactor device a cycle operation that the present invention is provided
Sequence is as follows：
(1) first time water-filling starts intake pump, while opening water intaking valve, pending raw water is filled with into sbr reactor device,
When reaching predetermined first time water-filling water (by the filling time t set1And combine liquid level H1Parameter is determined) when, it is by control
System closes water intaking valve and water inlet water pump in real time.
(2) aerobic aeration operation sbr reactor device is completed after first time water-filling, opened in real time by control system air blower and
Intake valve, aeration operation is carried out to reactor, the organic matter gone in water removal, and is nitrate nitrogen by ammonium oxidation in water.
In aeration process, real time on-line monitoring pH and DO signal.When there is organic matter in water inlet, aeration initial stage is to drop
Solve based on organic matter, the pH duration curves monitored in real time are (see Fig. 3) in upward status.When the pH value monitored switchs to stable decline
During state, show that the nitration reaction of denitrogenation has started to normal generation, it is approximately platform-like that now DO duration curves shape, which also enters,
State, or in the state slowly risen (see Fig. 3).With the progress of nitration reaction, when monitoring that pH curves switch to rise by declining
Occur " valley point " (see A points in Fig. 3), while DO curves be in rapid increase state (see B points in Fig. 3) when, or pH value drop to compared with
Low (general pH<6) switch to be basically unchanged after, while when DO values were risen to close to saturation state (belonging to the not enough situation of basicity),
Show that the nitration reaction of denitrogenation has stopped.Accordingly and binding tests result, the control strategy for formulating aerobic aeration operation is as follows：
Start after aeration, pH the and DO signal samplings interval t of on-line monitoring2Take 60s.To eliminate interference, to what is gathered
pHiAnd DOiValue carries out the real-time glide filter processing of 4 values (calculating the average value that 4 values are slided), and calculates in real time two neighboring
Glide filter value pHLbi-1、pHLbiWith DOLbi-1、DOLbiTo the average rate of change K of timepHi=(pHLbi-pHLbi-1)/(ti-ti-1)
And KDOi=(DOLbi-DOLbi-1)/(ti-ti-1) value.In aeration process, when monitoring KpHiIt is worth continuous more than 4min<After 0,
Note monitoring KpHiAnd KDOiThe situation of change of value, when monitoring KpHiValue is become just (see A points in Fig. 4) by negative, while meeting KDOi>
KDOi-1>KDOi-2>KDOi-3>When 0 (see in Fig. 4 near B points), or monitor KpHiAbsolute value<0.002/min, while DOLbi>
During 5mg/L, air blower and intake valve are closed by control system in real time, stop aeration operation.
(3) second of water-filling and add carbon source stirring operation stop aeration operation after, opened in real time by control system again
Intake pump and water intaking valve, the remainder of a cycle predetermined process raw water amount is filled with into reactor, is added while opening carbon source
Valve and carbon source add pump and add denitrifying carbon source (methanol etc.), and start mixing plant.When the filled water amount for reaching second of water-filling
With carbon source injected volume (by the filling time t set3, carbon source release time t4And combine liquid level H2Control) when, it is real by control system
When close water intaking valve, water inlet water pump and carbon source add pump, carbon source and add valve.
The injected volume of carbon source, can fill according to nitrate nitrogen content in mixed liquor at the end of nitrification and for the second time Organic substance in water and contain
The situation of change of amount, by being manually adjusted in real time, makes it meet denitrifying demand (4.0 just<BOD5/ nitrate nitrogen<
4.2)。
In whipping process, denitrifying bacterium is electron donor using the organic matter in second of water inlet and additional carbon source,
Denitrification removing first time aerobic stage produces nitrate nitrogen, and promotes denitrification process using the ammonia nitrogen in second of water inlet, together
When also second is intake in ammonia and nitrogen components be partially removed in denitrification process.
In whipping process, real time on-line monitoring pH and ORP signal.Second water-filling and add carbon source process may be right
PH and ORP sensor signals produce interference, it is thus possible to the wild effect of pH and ORP indicating values occurs.After system is stable,
The ORP duration curves monitored are in first rapid decrease state, and then decrease speed gradually slows down and is transitioned into close to constant speed and declines
State, pH duration curves are in then to stablize propradation (see Fig. 3).With the passage of mixing time, when monitoring pH duration curves
Switch to decline (see C points in Fig. 3) by rising, and almost simultaneously (slightly in advance sometimes or delayed 1~2 minute), ORP lasts song
When line then forms " knee point " (see D points in Fig. 3) by switching to rapid decrease suddenly close to constant speed decline state, show the anti-of denitrogenation
Nitration reaction has stopped.Accordingly and binding tests result, the control strategy for formulating anoxia stirring operation is as follows：
The sampling interval t of the pH and ORP signals of on-line monitoring5Take 60s.For the purposes of eliminating interference, start after stirring, it is right
The pH gatherediAnd ORPiValue carries out the real-time glide filter processing of 4 values (calculating the average value that 4 values are slided), and calculates in real time
Two neighboring glide filter value pHLbi-1、pHLbiWith ORPLbi-1、ORPLbiTo the average rate of change K of timepHi=(pHLbi-
pHLbi-1)/(ti-ti-1) and KORPi=(ORPLbi-ORPLbi-1)/(ti-ti-1) value.In whipping process, when monitoring KpHiValue connects
Continuous more than 3min is>After 0, noting monitoring KpHiAnd KORPiWhile value changes, start K in real timeORPiIt is worth critical with setting
Value KORPk(taking -1.2~-1.4mV/min) is compared.As the K monitoredpHiValue becomes negative (see C points in Fig. 4) by positive, while
This characteristic point nearby (in advance or in delayed 2min), monitors KORPi<KORPi-1, and KORPi≤KORPkWhen (see D points in Fig. 4),
Stop stirring operation in real time by control system.
(4) after short-time aeration operation anoxia stirring stops, air blower and intake valve pair are opened by control system in real time again
Reactor carries out short time blast aeration (aeration time t6Take 7~20min), main purpose is that stripping is attached on mud granule
Nitrogen and further oxidation may remaining organic matter and part ammonia and nitrogen components.As the aeration time t for reaching setting6When, by
Control system closes air blower and intake valve in real time, stops aeration operation.
(5) precipitation stops after aeration operation, the mixed liquor in reactor is in precipitated form, realizes mud-water separation.
(6) the sedimentation time t of draining and spoil disposal setting to be achieved7After (taking 40~70min), system opens draining in real time
Draining valve on pipeline, reactor is discharged by the supernatant after processing；According to the spoil disposal scheme of setting, system opens spoil disposal in real time
Spoil disposal valve spoil disposal on pipeline.As the water discharge time t for reaching setting8(taking 60~90min) and sludge-drainage time t9(take 5~
After 25min), system closes draining valve and mud valve in real time.
(7) reactor that leaves unused is in the holding state being stopped, as the standby time t for reaching setting10(take 10~
When 50min), that is, complete the operation process of sbr reactor device a cycle.At this moment, system is transferred to the circulating in next cycle automatically
OK.
Explanation：Because biological denitrification process will consume basicity, when basicity is not enough in processed sewage【Total alkalinity (with
CaCO3Meter)/kjeldahl nitrogen<3.6】When, during nitration reaction system pH value can be caused excessively to reduce, and then it is anti-to suppress nitrification
Process is answered, and makes DO rapid increases.Therefore, when basicity is not enough in sewage, basicity should suitably be supplemented【Meet total alkalinity (with
CaCO3Meter)/kjeldahl nitrogen>3.6】, otherwise though the present invention has the effect of energy efficiency, can not realize the purpose of advanced nitrogen.
Water-filling ratio lambda twice1And λ2The determination of (water-filling scheme)
The ratio lambda of water-filling twice1And λ2, kelvin nitrogen concentration S that can be according to processed raw wateroN, denitrogenation processing target SeN
Determined with total water-filling ratio δ in reactor cycle.Second of water-filling ratio lambda2First time water-filling ratio lambda should be not less than19%, fit
As increase λ2, although the total nitrogen concentration of water outlet is increased, but more raw waters can be made to be assigned in denitrification section, raw water
Carbon source can be denitrification denitrogenation service.Therefore, under conditions of denitrogenation processing target is met, should try one's best increase λ2, it is anti-to reduce
The injected volume of the outer carbon source of nitrification and the operating cost of reduction system.Based on this principle, and the λ that binding tests result is set up1And λ2
Calculation formula it is as follows：
Work as λ1<When 50%, λ is taken1=50% (1)
λ2=1- λ1 (2)
λ in formula1And λ2The ratio of total filled water amount is accounted for for the filled water amount twice in sbr reactor device cycle；
SoNFor the kelvin nitrogen concentration (taking 20~120mg/L) for the raw water that is processed；
SeNFor the total nitrogen concentration (processing target) of water outlet after processing；
δ is total water-filling ratio (taking 1/2~2/3) in sbr reactor device cycle.
(such as S in a special caseoNClose to 20mg/L, SeNDuring=8mg/L), obtained λ is calculated by formula (1)1It can go out
It is existing<50% situation, now takes λ1=λ2=50%.
The water-filling scheme determined according to formula (1) and formula (2), the kjeldahl nitrogen intake in laboratory conditions with SBR is dense
When spending for 20~120mg/L (nitrate nitrogen is 0mg/L in raw water), preferable denitrogenation processing result can be obtained.In working condition
Under, it is higher than denitrogenation processing target S if there is the total nitrogen of SBR processing system water outletseNWhen, can be by λ2According to successively decreasing 1%~0.3%
Mode be adjusted【λ1Also it is adjusted accordingly according to (2) formula】, until meeting processing target SeNUntill.
Beneficial effects of the present invention and part test result
To simulate nitric wastewater as process object, using methanol as denitrification additional carbon, in the dischargeable capacity of sbr reactor device
Respectively 12L and 4L, enters water mixed liquid COD ≈ 30~50mg/L, NH4 +- N ≈ 20~80mg/L, NOx -- N ≈ 0mg/L, reaction
Process temperature is about 24 DEG C, and sludge concentration is controlled in 4500~7500mg/L, and other conditions are identical and are satisfied by biological denitrificaion
Under the conditions of, proved by contrast test repeatedly long-term and stage by stage, it is proposed by the present invention " to improve municipal sewage using ammonia nitrogen to take off
The SBR deep denitrification methods of nitrogen efficiency " are not present compared with the conventional SBR advanced nitrogens system of ammonia nitrogen with denitrification section, are had
Below significantly synergy, energy-conservation and consumption reduction effect：
(1) can be with the denitrification ability of strengthening system
System denitrification section, can also be in the case where not increasing denitrifying carbon source during nitrate nitrogen of degrading simultaneously
Removal accounts for the ammonia and nitrogen components for nitrate nitrogen amount more than 8% (average) that be degraded, and the statistics of part gradient test result is shown in Table 1.
The SBR parts typical cycle denitrification section ammonia nitrogen removal situation result of the test statistics of table 1①
1. the nitrite nitrogen concentration in table at the end of all test period aeration nitrifications in mixed liquor is 0mg/L.
(2) anti-nitration reaction speed can be increased substantially and the power consumption of denitrification process is reduced
Under test conditions, it when there are appropriate ammonia and nitrogen components in denilrification system, can improve denitrification denitrogenation speed
More than 35%, denitrification stirring power energy consumption is reduced more than 25%.The statistics of part test is shown in Table 2 with result of calculation.
The denitrification of table 2 SBR1 of the section containing ammonia nitrogen is compared with the SBR2 systems denitrification section relevant parameter without ammonia nitrogen
1. listed content is the comparative test result of the stabilization sub stage after different times domestication in table.Because different times are tamed and dociled
The denitrifying bacterium concentration and activity of change have differences, therefore the different times denitrification rates listed by table are there is also difference, but
Contemporaneity SBR1 and SBR2 denitrification rates ratio are basically identical.For example, the 1st contrasts the de- of cycle SBR1 and SBR2
Nitrogen speed is respectively 7.085 and 5.150mgN/gMLSSh, and the 3rd contrast cycle SBR1 and SBR2 denitrification rates then divide
Not Wei 4.556 and 3.342mgN/gMLSSh, there is bigger difference, but SBR1 the and SBR2 denitrogenations in the two contrast cycles
The ratio of speed is basically identical (being respectively 1.376 and 1.363).
2. because of denitrification denitrogenation speed and denitrification mixing time inversely, so two system denitrification mixings time
Ratio be exactly their corresponding denitrification rates than inverse.With the data instance in first contrast cycle in table, SBR1 anti-nitre
It is 1.376 times of SBR2 to change denitrification rates, then the ratio of their mixings time is 1/1.376=0.727, therefore SBR1 stirring
Time reduces 1-0.727=0.273, i.e. stirring power depletion few 27.3% with respect to SBR2.
(3) injected volume of the denitrification process to carbon source outside the demand of carbon source and reduction denitrification can be reduced
Because denitrification process is while deoxidization, degradation nitrate nitrogen, moreover it is possible to increase degraded and account for the nitrate nitrogen amount that is degraded
The ammonia and nitrogen components of more than 8% (average).The theoretical analysis and comparative test result can be obtained, and appropriate ammonia nitrogen is contained in denitrification process
When, denitrification denitrogenation (including ammonia nitrogen and nitrate nitrogen) process can be made to reduce by 10% or so carbon source demand.
On the other hand, because the organic matter in second of water-filling can be utilized as denitrifying carbon source, therefore it can reduce
The injected volume of the outer carbon source of denitrification.If for example, processed raw water kelvin nitrogen concentration SoNFor 40mg/L, denitrogenation processing target SeN
For 4mg/L, total water-filling ratio δ of SBR period treatments is 2/3, and λ can be obtained by formula (1) and formula (2)2=20.6%.If raw water
Middle carbon source abundance (BOD5/ total nitrogen>4.0), then in denitrification process, the outer carbon source of above-mentioned 10% or so is added except that can reduce
On the basis of, it can also reduce the dosage of 20.6% outer carbon source.
(4) consumption of the aerobic power consumption and denitrification process of denitrification system to basicity can be reduced
According to water-filling scheme determined by formula (1) formula (2), it can be obtained under conditions of denitrogenation processing target is ensured
Second of the filled water amount that must try one's best big.Organic matter and ammonia nitrogen in second of water-filling are not undergo aerobic process and be directly entered
Denitrification section, if therefore the λ still in above example2Exemplified by=20.6% second of water-filling of progress, it is possible to ensureing at denitrogenation
Manage target SeNUnder conditions of, the aerobic power consumption and basicity for reducing 20.6% are consumed.
(5) the aerobic aeration time and anoxia stirring time of biological denitrification process are controlled using Real-Time Control Strategy, is not deposited
Nitrification or the incomplete phenomenon of denitrification caused by not enough due to aeration or mixing time, also in the absence of because of excess aeration or stirring
The raising for the operating cost mixed and brought.
(6) can be according to the change of the operation conditions of water quality, water and system of raw water etc., the operation of real-time regulating system
Control parameter, is realized energy-saving on the premise of effluent quality is ensured.
(7) it can complete whole processing procedure real-time online control, manage easy to operate.
Brief description of the drawings
Fig. 1 is the operational mode of the SBR technique a cycles of the present invention；
Fig. 2 is that denitrification section has " SBR1 " of ammonia nitrogen and " SBR2 " typical cycle in the absence of ammonia nitrogen lasts contrast knot
Really.
When denitrification starts, in " SBR1 " in addition to nitrate nitrogen, also containing appropriate ammonia nitrogen, nitrite nitrogen content is
Zero；There was only nitrate nitrogen in SBR2, in the absence of ammonia nitrogen and nitrite nitrogen.Two system denitrifying carbon sources are sufficient, other reaction bars
Part (such as sludge concentration, temperature, fill draining ratio, the method for operation) is identical；Two systems are gone through with pH in denitrification process and ORP
When curve on characteristic point " C " and " D " appearance, and combine nitrate nitrogen testing result control terminate denitrification process.Through
Calculating is known：The denitrification rates of " SBR1 " improve 37.6% compared with " SBR2 ", and the stirring energy consumption of " SBR1 " is compared with " SBR2 " reduction by 27.3%.
Fig. 3 is dense with ammonia nitrogen, nitrate nitrogen and nitrite nitrogen for pH, DO, ORP parameter in SBR denitrification process typical cycles
Spend the duration curve of change (pH, DO and ORP in figure are the data after being handled through 4 value filterings).
Fig. 4 is the rate of change K of pH, DO, ORP parameters versus time in Fig. 3pH、KDO、KORPWith ammonia nitrogen, nitrate nitrogen and nitrous
The duration curve of hydrochlorate nitrogen concentration change.
PH, DO parameter duration curve and its corresponding rate of change last song at the end of Fig. 3 and Fig. 4, nitrifying process
PH, ORP parameter duration curve and its corresponding rate of change last song at the end of characteristic point " A " and " B " on line, denitrification process
Characteristic point " C " and " D " on line is all fairly obvious, and this is to stop nitrification and denitrification mistake in real time online with pH, DO, ORP parameter
Journey provides foundation.
Fig. 5 is On-line Control strategic process figure of the invention.
Embodiment
1st step determines system operation control parameter
SBR sewage disposal systems for having been turned on simultaneously stable operation, according to processing target and the processed original grasped
The water quality characteristicses of water, system operation control parameter is determined according to following steps：
(1) total water-filling ratio δ (taking 1/2 to 2/3) in cycle is determined, the kelvin nitrogen concentration S according to processed raw wateroNWith it is de-
The processing target S of nitrogeneN, water-filling scheme λ is determined according to formula (1) and (2)1And λ2；
(2) according to the total Water of a period treatment and water-filling ratio lambda1And λ2, it is determined that each water-filling water, and then determine
Each filling time t1、t3；
(3) by first time filled water amount determine that water-filling terminates after liquid level H1, by second of filled water amount and with reference to outer carbon source liquid
The injected volume of body determines liquid level H when reactor is full of2；
(4) determine it is aerobic during DO and pH signals sampling interval t2PH and OPR signals in (taking 60s) and whipping process
Sampling interval t5(taking 60s)；
(5) critical value Ks of the OPR to the time average rate of change at the end of determination denitrification as neededORPk(take -1.2~-
1.4mV/min)；
(6) nitrate is terminated in mixed liquor according to nitrification and fills the content of Organic substance in water for the second time, according to 4.0<
BOD5/ nitrate nitrogen<4.2 condition, determines the dosage of the outer carbon source liquid of denitrification, and then determines that carbon source adds time t4；
(7) short-time aeration time t is determined as needed6(taking 7~20min) and sedimentation time t7(taking 40~70min)；
(8) water discharge time t is determined according to the displacement in a cycle8(taking 60~90min)；
(9) at the end of being reacted with sbr reactor device each cycle, the sludge concentration of mixed liquor be 4500~6000mg/L be according to
According to determining the sludge volume of each cycle, and then determine sludge-drainage time t9(taking 5~25min)；
(10) standby time t is determined as needed10(10~50min is taken, before 24 hours 1 day process cycle numbers are ensured
Put, the kelvin nitrogen concentration S of raw wateroNWhen higher, the time of system process cycle will lengthen, then during idle between each cycle
Between will accordingly shorten, otherwise will extend)；
(11) completed on control device to above-mentioned control parameter δ, λ1、λ2、H1、H2、t1~t10、KORPkThe setting of value；
(12) according to Fig. 1 operational mode, under the domination of control strategy, realize and the On-line Control of processing system is transported
OK.
The basic fundamental process of 2nd step sbr reactor device a cycle operation
(1) first time water-filling starts intake pump, while opening water intaking valve, pending raw water is filled with into sbr reactor device,
When the first time water-filling water for reaching predetermined (reaches the filling time t of setting1With liquid level H1) when, closed in real time by control system
Close water intaking valve and water inlet water pump.
(2) aerobic aeration operation sbr reactor device is completed after first time water-filling, opened in real time by control system air blower and
Intake valve, is aerated to reactor and runs, the organic matter gone in water removal, and is nitrate nitrogen by ammonium oxidation in water.In aeration process
In, according to control strategy, when the characteristic point that nitrification end is characterized on pH the and DO duration curves of on-line monitoring occurs, by controlling
System closes air blower and intake valve in real time, stops aeration operation.
(3) second of water-filling and add carbon source and stir operation stop aeration operation after, opened in real time by control system again
Intake pump and water intaking valve are opened, the remainder of a cycle predetermined process raw water amount is filled with into reactor, is thrown while opening carbon source
Plus valve and carbon source add pump and throw denitrifying carbon source (methanol etc.), and start mixing plant.When the filled water amount for reaching second of water-filling
With carbon source injected volume (by the filling time t set3, carbon source release time t4And combine liquid level H2Control) when, it is real by control system
When close water intaking valve, water inlet water pump and carbon source add pump, carbon source and add valve.
In whipping process, denitrifying bacterium is electron donor using the organic matter in second of water inlet and additional carbon source,
Denitrification removing first time aerobic stage produces nitrate nitrogen, and the ammonia nitrogen in being intake using second promotes denitrification process, simultaneously
Also the ammonia and nitrogen components during second is intake are partially removed in denitrification process.According to control strategy, when on-line monitoring
When the characteristic point that sign denitrification terminates on pH and ORP duration curves occurs, mixing plant is stopped by control system in real time, stopped
Stirring operation.
(4) after short-time aeration operation denitrification process terminates, air blower and intake valve are automatically turned on by control system again
Short time blast aeration is carried out to reactor, main purpose is the nitrogen that stripping is attached on mud granule and further oxidation can
Can remaining organic matter and part ammonia and nitrogen components.As the short-time aeration time t for reaching setting6When, it is automatic in real time by control system
Air blower and intake valve are closed, stops aeration operation.
(5) precipitation stops after aeration operation, the mixed liquor in reactor is in precipitated form, realizes mud-water separation.
(6) draining and spoil disposal setting sedimentation time t to be achieved7When, system opens the draining valve on drainage pipeline in real time,
Supernatant after processing is discharged into reactor through water decanter；According to the spoil disposal scheme of setting, system is opened on spoil disposal pipeline in real time
Mud valve spoil disposal.As the water discharge time t for reaching setting8With sludge-drainage time t9When, system closes draining valve and mud valve in real time.
(7) reactor that leaves unused is in the idle holding state being stopped.As the predetermined idle stand-by time t of arrival10I.e.
Complete the operation process of sbr reactor device a cycle.At this moment, system is transferred to the circular flow in next cycle automatically.
The advanced nitrogen processing of Small Urban sewage is the composite can be widely applied to, the nitrogenous of basicity abundance is can also be applied to
The advanced nitrogen processing of industrial wastewater.
Claims (1)
1. improving the SBR deep denitrification methods of municipal sewage nitric efficiency using ammonia nitrogen, sbr reactor device is connected with water inlet pipe, carbon
Source adds pipe, aeration tube, outlet pipe and discharge pipeline；Sbr reactor device is supplied water by intake pump through water intaking valve, water inlet pipe, is thrown by carbon source
Plus pump through carbon source adds valve, carbon source and adds pipe and adds carbon source, is aerated by air blower through being aerated intake valve, aeration tube；In SBR
Corresponding draining valve and mud valve are also provided with reactor outlet pipe and discharge pipeline；
Agitator, liquid level sensor, pH sensors, DO sensors and ORP sensors are provided with sbr reactor device；Liquid level is passed
The detection signal of sensor and pH, DO, ORP sensor is connected after distinguishing sampled, conversion and processing with controller；By excessively program control
Relay in device processed implements On-line Control to the running of system；
It is characterized in that：
The raw water total amount of SBR each cycle predetermined process is filled with reactor in two times, twice water-filling ratio lambda1And λ2Determination method
It is as follows：
Work as λ1<When 50%, λ is taken1=50% (1)
λ2=1- λ1 (2)
λ in formula1And λ2The ratio of total filled water amount is accounted for for the filled water amount twice in sbr reactor device cycle；
SoNFor processed raw water kelvin nitrogen concentration, 20~120mg/L is taken；
SeNFor the total nitrogen concentration of water outlet after processing；
δ is total water-filling ratio in sbr reactor device cycle, takes 1/2~2/3；
The process of sbr reactor device a cycle operation is as follows：
(1) first time water-filling start intake pump, while open water intaking valve, pending raw water is filled with sbr reactor device, when up to
During to predetermined first time water-filling water, water intaking valve and water inlet water pump are closed in real time by control system；
(2) aerobic aeration operation sbr reactor device is completed after first time water-filling, and air blower and air inlet are opened in real time by control system
Valve, aeration operation is carried out to reactor, the organic matter gone in water removal, and is nitrate nitrogen by ammonium oxidation in water；
Start after aeration, real time on-line monitoring pH and DO signal；Monitor the sampling interval t of pH and DO signals on-line260s is taken, and it is right
The pH gatherediAnd DOiValue carries out the real-time glide filter processing of 4 values, that is, the average value that 4 values are slided is calculated, while calculating adjacent
Two glide filter value pHLbi-1、pHLbiWith DOLbi-1、DOLbiTo the average rate of change K of timepHi=(pHLbi-pHLbi-1)/(ti-
ti-1) and KDOi=(DOLbi-DOLbi-1)/(ti-ti-1) value；
In aeration process, when monitoring KpHiIt is worth continuous more than 4min<After 0, note monitoring KpHiAnd KDOiThe change feelings of value
Condition, when monitoring KpHiValue is become just, while meeting K by negativeDOi>KDOi-1>KDOi-2>KDOi-3>When 0, drum is closed by control system in real time
Blower fan and intake valve, stop aeration operation；
(3) second of water-filling and add carbon source stirring operation stop aeration operation after, open water inlet in real time by control system again
Pump and water intaking valve, the remainder of a cycle predetermined process raw water amount is filled with into reactor, at the same open carbon source add valve and
Carbon source adds pump and adds denitrifying carbon source, and starts mixing plant；When the filled water amount and carbon source injected volume that reach second water-filling
When, close water intaking valve, water inlet water pump and carbon source in real time by control system and add pump, carbon source and add valve；
The injected volume of carbon source, according to 4.0<BOD5/ nitrate nitrogen mass concentration<4.2 condition is determined；
Start after stirring, real time on-line monitoring pH and ORP signal；Monitor the sampling interval t of pH and ORP signals on-line560s is taken, and
To the pH gatherediAnd ORPiValue carries out the real-time glide filter processing of 4 values, that is, calculates the average value that 4 values are slided, calculate simultaneously
Two neighboring glide filter value pHLbi-1、pHLbiWith ORPLbi-1、ORPLbiTo the average rate of change K of timepHi=(pHLbi-
pHLbi-1)/(ti-ti-1) and KORPi=(ORPLbi-ORPLbi-1)/(ti-ti-1) value；
In whipping process, when monitoring KpHiIt is worth continuous more than 3min>After 0, noting monitoring KpHiAnd KORPiValue changes it is same
When, start K in real timeORPiValue and the critical value K of settingORPkIt is compared, KORPkTake -1.2~-1.4mV/min；When monitoring
KpHiValue becomes negative by positive, while in 2min, monitoring K before or after this characteristic pointORPi<KORPi-1, and KORPi≤KORPkWhen, by
Control system stops stirring operation in real time；
(4) after short-time aeration operation anoxia stirring stops, air blower and intake valve are opened in real time by control system again to reaction
Device carries out short time blast aeration, aeration time t67~20min is taken, as the aeration time t for reaching setting6When, by control system
Air blower and intake valve are closed in real time, stop aeration operation；
(5) precipitation stops after aeration operation, the mixed liquor in reactor is in precipitated form, realizes mud-water separation；
(6) after draining and spoil disposal are precipitated, draining and spoil disposal process are completed；
(7) reactor that leaves unused is left unused after 10~50min, and the circular flow in next cycle is transferred to automatically；
Processed sewage should meet total alkalinity/kelvin nitrogen concentration>3.6, total alkalinity is with CaCO3Meter, when basicity is not enough in sewage
When, basicity should be supplemented.
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