CN106745741A - The anaerobic oxidation ditch and its operating method of intensified anti-nitrated denitrogenation dephosphorizing - Google Patents
The anaerobic oxidation ditch and its operating method of intensified anti-nitrated denitrogenation dephosphorizing Download PDFInfo
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- CN106745741A CN106745741A CN201611217887.5A CN201611217887A CN106745741A CN 106745741 A CN106745741 A CN 106745741A CN 201611217887 A CN201611217887 A CN 201611217887A CN 106745741 A CN106745741 A CN 106745741A
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- oxidation ditch
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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
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
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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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1257—Oxidation ditches
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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
- C02F3/308—Biological phosphorus removal
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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
- C02F2209/44—Time
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses the anaerobic oxidation ditch and its operating method of a kind of intensified anti-nitrated denitrogenation dephosphorizing, the anaerobic oxidation ditch is：Anaerobic pond is connected by water inlet end of the pipeline successively with oxidation ditch pool, sedimentation basin, threeway, sludge reflux pump, and the water side of sludge reflux pump is connected by pipeline with anaerobic pond；Water inlet pipe is provided with the side wall of anaerobic pond；Agitator is internally provided with anaerobic pond；Oxidation ditch pool bottom even sets micro-hole aerator, micro-hole aerator is connected with blast aeration machine, first underwater propeller is set at side gallery starting ends midline position available depth 1/2nd, the second underwater propeller is set at opposite side gallery starting ends midline position available depth 1/2nd.The present invention does not change other operational factors, do not use chemical agent, only transformed by the aeration mode to oxidation ditch circulation gallery and aeration oxygen supply region, so that it may so that Denitrifying Phosphate Accumulating Organisms are enriched with, oxidation ditch system denitrogenation dephosphorizing can be made while reaching clearance higher.
Description
Technical field
The invention belongs to the technical field of sewage in environmental project, it is related to a kind of detesting for intensified anti-nitrated denitrogenation dephosphorizing
Oxygen-oxidation ditch and its operating method.
Background technology
With the raising of environmental protection requirement, need to carry out denitrogenation dephosphorizing while waste water control organics removal.Therefore
Many researchers increase anaerobic zone (or anaerobic pond) before oxidation ditch is circulated into gallery, to meet the dephosphorization requirement of sewage.Oxidation ditch
Realize that one of denitrification functions, method are that regulation aerator forms aerobic zone and anoxic zone in circulation gallery, can be real in aerobic zone
Existing oxidation operation and nitration reaction, denitrification denitrogenation can be carried out in anoxic zone.
And the length of mixed liquor fashionable colors in oxidation ditch circulation gallery, determine again mixed liquor every time in aerobic zone and
The length of anoxic zone residence time.
As shown in figure 1, mixed liquor length of fashionable colors in oxidation ditch circulation gallery can be characterized with (1) formula：
In formula (1)：T-cycle period, i.e. the mixed liquor popular circle time used, min in oxidation ditch pool circulation gallery
Lmid- oxidation ditch pool circulates gallery center line girth, and m circulates gallery internal weakness line length that is, shown in Fig. 1
Epidemic rate of the v-mixed liquor in oxidation ditch pool circulation gallery, m/s；
So mixed liquor flows through time T used by aerobic zone each timeoAerobic zone volume V is multiplied by equal to cycle period ToAccount for and follow
Ring gallery total measurement (volume) VCCRatio, see (2) formula：
In formula (2)：To- mixed liquor flows through used by aerobic zone time, min every time
Vo- aerobic zone volume, m3
VCC- oxidation ditch pool circulates gallery total measurement (volume), m3
So mixed liquor flows through time T used by anoxic zone each timenAnoxic zone volume V is multiplied by equal to cycle period TnAccount for and follow
Ring gallery total measurement (volume) VCCRatio, see (3) formula：
In formula (3)：Tn- mixed liquor flows through used by anoxic zone time, min every time
Vn- anoxic zone volume, m3
Wherein：VCC=Vo+Vn(4)
And different oxidation ditch cycle period difference is very big, as shown in table 1：
The cycle period table of the domestic and international built oxidation ditch of table 1
Note：1. H is circulation gallery available depth；V is based on 0.3m/s when 2. calculating T.
Can be seen that built oxidation ditch cycle period, from a few minutes to dozens of minutes, differs greatly by data in table 1.
For the oxidation ditch process that aerobic zone and anoxic zone are set in circulation gallery, the difference of cycle period can influence mixed liquor to exist every time
Aerobic zone and the length of anoxic zone residence time, and then influence whether that Denitrifying Phosphate Accumulating Organisms (DPAOs) account for total polyP bacteria (PAOs)
Ratio, finally influence whether the effect of oxidation ditch denitrogenation dephosphorizing.
Denitrifying phosphorus removing bacteria (DPAOs), it is possible to use NO3 -、NO2 -As electron acceptor, the poly- beta-hydroxy of organic matter of intracellular
Alkanoate (PHA) as carbon source and electron donor, for inhaling phosphorus under anaerobic environment, while by NO3 -、NO2 -It is reduced to nitrogen
Gas.So Denitrifying Phosphate Accumulating Organisms can realize that a carbon is dual-purpose, i.e. the PHA of intracellular storage can simultaneously be used for denitrification denitrogenation and lack
Oxygen inhales phosphorus.Therefore when the Denitrifying Phosphate Accumulating Organisms in system increase, the organic matter consumption of system denitrogenation dephosphorizing, oxygen demand and surplus
Remaining sludge discharge can be low compared with conventional denitrification denitrogenation and aerobic dephosphorization.
The content of the invention
The purpose of the present invention is to take SECO to cycle period, there is provided a kind of intensified anti-nitrated denitrogenation dephosphorizing is detested
Oxygen-oxidation ditch.
Second object of the present invention is to provide a kind of operation side of the anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing
Method.
Technical scheme is summarized as follows：
A kind of anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, anaerobic pond 2 by pipeline successively with oxidation ditch pool 3, heavy
Shallow lake pond 4, threeway 6, the water inlet end connection of sludge reflux pump 5, the water side of sludge reflux pump 5 is connected by pipeline with anaerobic pond 2；
Water inlet pipe 1 is provided with the side wall of anaerobic pond 2；Threeway 6 is connected with excess sludge delivery pipe 7；The top of sedimentation basin 4 is provided with out
Water pipe 8；Agitator 9 is internally provided with anaerobic pond 2；Micro-hole aerator 10, micropore are evenly arranged with the inner bottom part of oxidation ditch pool 3
Aerator 10 is connected by pipeline with the blast aeration machine 11 being arranged on outside oxidation ditch pool 3, blast aeration machine 11 and time switch
12 connections, the first underwater propeller 13 is provided with side gallery starting ends midline position available depth 1/2nd, another
The second underwater propeller 14 is provided with side porch road starting ends midline position available depth 1/2nd.
A kind of operating method of the anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, comprises the following steps：
(1) use a kind of anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, anaerobic pond 2 by pipeline successively with oxidation
Ditch pond 3, sedimentation basin 4, threeway 6, the water inlet end connection of sludge reflux pump 5, the water side of sludge reflux pump 5 passes through pipeline and anaerobism
Pond 2 connects；Water inlet pipe 1 is provided with the side wall of anaerobic pond 2；Threeway 6 is connected with excess sludge delivery pipe 7；The top of sedimentation basin 4
It is provided with outlet pipe 8；Agitator 9 is internally provided with anaerobic pond 2；Micro-pore aeration is evenly arranged with the inner bottom part of oxidation ditch pool 3
Device 10, micro-hole aerator 10 is connected by pipeline with the blast aeration machine 11 being arranged on outside oxidation ditch pool 3, blast aeration machine 11 with
Time switch 12 is connected, and the first underwater propeller is provided with side gallery starting ends midline position available depth 1/2nd
13, it is provided with the second underwater propeller 14 at opposite side gallery starting ends midline position available depth 1/2nd；
(2) raw sewage is flowed into anaerobic pond 2 from water inlet pipe 1, while the returned sludge in autoprecipitation in future pond 4 is through sludge reflux
Pump 5 pumps into anaerobic pond 2, and raw sewage and returned sludge mix in the presence of agitator 9, and the muddy water mixed solution of formation flows into oxidation
Ditch pond 3, opens the first underwater propeller 13 and the second underwater propeller 14, and muddy water mixed solution is followed in gallery in oxidation ditch pool 3
Circulation is moved；Blast aeration machine 11 is controlled to open and close by time switch 12, blast aeration machine 11 opens operation ToMinute, pass through
Micro-hole aerator 10 will make T to the oxygen supply of oxidation ditch pool 3, blast aeration machine air demandoTime internal oxidition ditch pond mixed liquor dissolved oxygen
Mean concentration is more than or equal to 2.0mg/L, then the continuously off T of blast aeration machine 11nMinute；To+Tn=T, T are a circulating cycle
Phase, 4 minutes≤To≤ 9 minutes, 4 minutes≤Tn≤ 9 minutes, and To=Tn；Muddy water mixed solution is flowed into through pipeline in oxidation ditch pool 3
Sedimentation basin 4；The supernatant liquor of sedimentation basin 4 is discharged through outlet pipe 8, and the base sludge of sedimentation basin 4 part is pumped into through sludge reflux pump 5 detests
Oxygen pond 2, another part is discharged by threeway 6 through excess sludge delivery pipe 7.
The invention has the advantages that：
(1) do not change other operational factors, chemical agent is not used, only by the aeration mode to oxidation ditch circulation gallery
And aeration oxygen supply region is transformed, so that it may so that Denitrifying Phosphate Accumulating Organisms are enriched with, oxidation ditch system denitrogenation dephosphorizing can be made
Reach clearance higher simultaneously.
(2) compared with other activated sludge process for realizing same treatment effect, the organic matter that can save 25% or so disappears
Consumption, saves 20% or so oxygen demand, and reduces 20% or so excess sludge production.
(3) compared with conventional activated sludge process, interior reflux pump of the aerobic zone to anoxic zone backflow mixed liquor is eliminated
Room and interior reflux pump, reduce floor space, have saved expenditure of construction.
(4) the sewage treatment plant's reforming mode to existing setting oxidation ditch process is simple, is particularly suited for cycle period small
In 8 points of transformations of the oxidation ditch sewage treatment plant of kind.It is also applied for newly-built sewage treatment plant.
Brief description of the drawings
Fig. 1 is prior art oxidation ditch cycle period relation derivation schematic diagram.
Fig. 2 is the anaerobism-oxidation ditch schematic diagram of intensified anti-nitrated denitrogenation dephosphorizing of the invention.
In Fig. 1：21 --- --- oxidation ditch pool 23 --- aeration rotary brush 24 --- underwater propellers of water inlet pipe 22
25 --- aerobic zone, region 26 --- anoxic zone of the mixed liquor dissolved oxygen concentration more than or equal to 2.0mg/L, oxygen in oxidation ditch pool
Region 27 --- sedimentation basin 28 --- returned sludge 29 --- of the mixed liquor dissolved oxygen concentration less than 2.0mg/L in Hua Gou ponds
The gallery of excess sludge 30 --- water outlet B-oxidation ditch pool circulation gallery is wide, m；
In Fig. 2：
1 --- --- --- oxidation ditch pool 4 --- sedimentation basin 5 --- sludge reflux pump of anaerobic pond 3 of water inlet pipe 2
The 6 --- --- --- --- agitators 10 --- micro-hole aerator 11 --- of outlet pipe 9 of excess sludge delivery pipe 8 of threeway 7
Blast aeration machine 12 --- time switch, 13 --- the first underwater propeller, 14 --- second underwater propeller 14.
Specific embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
A kind of anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, is shown in Fig. 2, anaerobic pond 2 by pipeline successively with oxidation ditch
Pond 3, sedimentation basin 4, threeway 6, the water inlet end connection of sludge reflux pump 5, the water side of sludge reflux pump 5 passes through pipeline and anaerobic pond
2 connections；Water inlet pipe 1 is provided with the side wall of anaerobic pond 2；Threeway 6 is connected with excess sludge delivery pipe 7；The top of sedimentation basin 4 sets
It is equipped with outlet pipe 8；Agitator 9 is internally provided with anaerobic pond 2；Micro-hole aerator is evenly arranged with the inner bottom part of oxidation ditch pool 3
10, micro-hole aerator 10 is connected by pipeline with the blast aeration machine 11 being arranged on outside oxidation ditch pool 3, blast aeration machine 11 and when
Control switch 12 is connected, and the first underwater propeller is provided with side gallery starting ends midline position available depth 1/2nd
13, it is provided with the second underwater propeller 14 at opposite side gallery starting ends midline position available depth 1/2nd.
A kind of operating method of the anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, comprises the following steps：
(1) use a kind of anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, anaerobic pond 2 by pipeline successively with oxidation
Ditch pond 3, sedimentation basin 4, threeway 6, the water inlet end connection of sludge reflux pump 5, the water side of sludge reflux pump 5 passes through pipeline and anaerobism
Pond 2 connects；Water inlet pipe 1 is provided with the side wall of anaerobic pond 2；Threeway 6 is connected with excess sludge delivery pipe 7；The top of sedimentation basin 4
It is provided with outlet pipe 8；Agitator 9 is internally provided with anaerobic pond 2；Micro-pore aeration is evenly arranged with the inner bottom part of oxidation ditch pool 3
Device 10, micro-hole aerator 10 is connected by pipeline with the blast aeration machine 11 being arranged on outside oxidation ditch pool 3, blast aeration machine 11 with
Time switch 12 is connected, and the first underwater propeller is provided with side gallery starting ends midline position available depth 1/2nd
13, it is provided with the second underwater propeller 14 at opposite side gallery starting ends midline position available depth 1/2nd；
(2) raw sewage is flowed into anaerobic pond 2 from water inlet pipe 1, while the returned sludge in autoprecipitation in future pond 4 is through sludge reflux
Pump 5 pumps into anaerobic pond 2, and raw sewage and returned sludge mix in the presence of agitator 9, and the muddy water mixed solution of formation flows into oxidation
Ditch pond 3, opens the first underwater propeller 13 and the second underwater propeller 14, and muddy water mixed solution is followed in gallery in oxidation ditch pool 3
Circulation is moved；Blast aeration machine 11 is controlled to open and close by time switch 12, blast aeration machine 11 opens operation ToMinute, pass through
Micro-hole aerator 10 will make T to the oxygen supply of oxidation ditch pool 3, blast aeration machine air demandoTime internal oxidition ditch pond mixed liquor dissolved oxygen
Mean concentration is more than or equal to 2.0mg/L, then the continuously off T of blast aeration machine 11nMinute；To+Tn=T, T are a circulating cycle
Phase, 4 minutes≤To≤ 9 minutes, 4 minutes≤Tn≤ 9 minutes, and To=Tn；Muddy water mixed solution is flowed into through pipeline in oxidation ditch pool 3
Sedimentation basin 4；The supernatant liquor of sedimentation basin 4 is discharged through outlet pipe 8, and the base sludge of sedimentation basin 4 part is pumped into through sludge reflux pump 5 detests
Oxygen pond 2, another part is discharged by threeway 6 through excess sludge delivery pipe 7.
Embodiment 1
The Nitrogen/Phosphorus Removal and DPAOs/PAOs of original anaerobism-oxidation ditch system
Original denitrogenation dephosphorizing anaerobism-oxidation ditch system, anaerobism pool volume Vp=20m3, it is a length of 5m of anaerobic pond, a width of
2m, a height of 2m；Oxidation ditch pool circulation gallery total measurement (volume) VCC=100m3, circulation gallery B wide is 1.5m, circulation gallery available depth H
It is 1.0m, LmidIt is 66.67m.40% is anoxic zone in oxidation ditch pool, and 60% is aerobic zone, therefore Vn=40m3, Vo=60m3.Oxygen
Aerobic zone bottom sets micro-hole aerator and carries out oxygen supply to aerobic zone mixed liquor in Hua Gou ponds, aerobic zone dissolved oxygen concentration is existed
More than 2.0mg/L.
Anaerobism-oxidation ditch flow of inlet water is Qin=240m3/ d, biological reaction pool total hrt HRT=12h, its
Middle anaerobic pond hydraulic detention time tp=2h, oxidation ditch pool hydraulic detention time HRTCC=10h, anoxic zone hydraulic detention time tn
=4h, aerobic zone hydraulic detention time to=6h.
Oxidation ditch pool cycle period T is 3.70min, wherein TnIt is 1.48min, ToIt is 2.22min.Raw sewage and backflow are dirty
Mud is flowed into by anaerobic pond origin or beginning water inlet, is mixed in the presence of agitator in anaerobic pond, and the muddy water mixed solution of formation flows into oxygen
Arrangement underwater propeller promotes mixed liquor flowing in Hua Gou ponds, oxidation ditch pool, and v is 0.3m/s.Mixed liquor is by going out in oxidation ditch pool
The mouth of a river exits into sedimentation basin and carries out mud-water separation, and the quiet water that settles out is discharged by sedimentation basin top, sedimentation basin bottom point sludge reflux
Enter anaerobic pond together with sewage to anaerobic pond origin or beginning.
The sludge reflux amount that sedimentation basin is back to anaerobic pond is 192m3/ d, i.e. return sludge ratio are 80%.Excess sludge is determined
Phase discharges from sedimentation basin bottom, system sludge age is maintained 12 days.Anaerobic pond and oxidation ditch pool mixed liquor sludge concentration MLSS
In 3600~3800mg/L.
The anaerobism-oxidation ditch system influent COD=408mg/L, TN=40.45mg/L, TP=7.03mg/L；Water outlet COD
=36mg/L, TN=15.50mg/L, TP=1.02mg/L；COD, TN and TP clearance are respectively 91.18%, 61.68% and
85.49%；The ratio DPAOs/PAOs that Denitrifying Phosphate Accumulating Organisms (DPAOs) account for total polyP bacteria (PAOs) in system is 12.72%.
Embodiment 2
Anaerobism-oxidation ditch the Nitrogen/Phosphorus Removal and DPAOs/PAOs of a kind of intensified anti-nitrated denitrogenation dephosphorizing of the invention
Original anaerobism-oxidation ditch system is transformed according to the present invention, i.e., intensified anti-nitrated denitrogenation dephosphorizing of the invention
Anaerobism-oxidation ditch, see Fig. 2, anaerobism pool volume Vp=20m3, a length of 5m of anaerobic pond, a width of 2m, a height of 2m remain unchanged；Oxygen
Circulate gallery total measurement (volume) V in Hua Gou pondsCC=100m3, circulation gallery B wide is 1.5m, and circulation gallery available depth H is 1.0m, LmidFor
66.67m, remains unchanged；Oxidation ditch pool bottom is evenly arranged micro-hole aerator.
Anaerobism-oxidation ditch flow of inlet water Q after transformationin=240m3/ d, biological reaction pool total hrt HRT=
12h, wherein anaerobic pond hydraulic detention time tp=2h, oxidation ditch pool hydraulic detention time HRTCC=10h.
Raw sewage flows into anaerobic pond from water inlet pipe, while the returned sludge in autoprecipitation in future pond is pumped into through sludge reflux pump and detested
Oxygen pond, raw sewage and returned sludge mix in the presence of agitator, and the muddy water mixed solution of formation flows into oxidation ditch pool, oxidation ditch
Underwater propeller is opened in pond promotes muddy water mixed solution in gallery internal circulation flow, and v is 0.3m/s.Air blast is controlled by time switch
Aerator is opened and closed, and blast aeration machine opens operation ToMinute, by micro-hole aerator to oxidation ditch pool oxygen supply, air blast exposes
Mechanism of qi air demand makes ToTime internal oxidition ditch pond mixed liquor dissolved oxygen mean concentration is more than or equal to 2.0mg/L, then blast aeration
The continuously off T of machinenMinute；To+Tn=T, T are a cycle period, 4 minutes≤To≤ 9 minutes, 4 minutes≤Tn≤ 9 minutes, and
To=Tn.Muddy water mixed solution flows into sedimentation basin through pipeline in oxidation ditch pool, carries out mud-water separation, and sedimentation basin supernatant liquor is through water outlet
Pipe is discharged, and a sedimentation basin base sludge part pumps into anaerobic pond through sludge reflux pump, and another part stimulates the menstrual flow excess sludge by three
Discharged.
The sludge reflux amount that sedimentation basin is back to anaerobic pond is 192m3/ d, i.e. return sludge ratio are 80%.Excess sludge is determined
Phase discharges from sedimentation basin bottom, system sludge age is maintained 12 days.Anaerobic pond and oxidation ditch pool mixed liquor sludge concentration MLSS
In 3600~3800mg/L.
V in former anaerobism-oxidation ditch systemo/VCCIt is 60%, Vn/VCCIt is 40%, but in improved anaerobism-oxidation ditch system
Dissolved oxygen concentration in gallery is circulated during system intermittent aerating, when just being closed due to aerator to be reduced to below 2.0mg/L and need
For a period of time, therefore it is aerated duration in intermittent aerating and non-aeration duration respectively accounts for 50%, i.e. To=Tn.
When table 2 changes T, anaerobism-oxidation ditch Nitrogen/Phosphorus Removal and DPAOs/PAOs after transformation
As shown in Table 2, when cycle period T is 40 minutes, mixed liquor aeration oxygen supply 20 minutes, the time is more long, therefore favorably
Fully reacted in aerobic phosphorus absorption, it is more which results in PHA consumption during aerobic phosphorus absorption, and leave denitrification when stopping aeration for
The PHA for inhaling phosphorus reaction is less, therefore denitrification phosphorus-collecting reaction can not be carried out preferably, after long-term cultivation, have led to DPAOs/
PAOs ratios are relatively low.Therefore T=40 minutes (To=Tn=20 minutes) when, DPAOs/PAOs proportions are 21% or so.
When cycle period T is decreased to 18 minutes, 14 minutes and 8 minutes, mixed liquor aeration oxygen supply time foreshortens to 9 points
Clock, 7 minutes and 4 minutes, the PHA amounts of now aerobic phosphorus absorption reaction consumption were reduced, and are thus advantageous to stop denitrification during aeration
The carrying out of poly- phosphorus reaction, after long-term cultivation, has led to DPAOs/PAOs ratios higher.So cycle period T is 18 minutes (To
=Tn=9 minutes), 14 minutes (To=Tn=7 minutes) and (T at 8 minuteso=Tn=4 minutes) DPAOs/PAOs up to 40% with
On.
When cycle period T is decreased to 4 minutes, mixed liquor aeration oxygen supply time and stopping aeration time foreshortening to 2 points
Clock.Although now aerobic phosphorus absorption reaction time and denitrifying phosphorus uptake reaction time are all shorter.But due to it has been generally acknowledged that all poly-
Phosphorus bacterium can carry out aerobic phosphorus absorption, can carry out in the polyP bacteria of aerobic phosphorus absorption only some can carry out anoxic and inhale phosphorus, so energy
The polyP bacteria quantity of aerobic phosphorus absorption is enough carried out always greater than the polyP bacteria quantity that can carry out anoxic suction phosphorus, therefore this is resulted in
, it is shorter to stop denitrification phosphorus-collecting reaction in the exposure time and fully carry out, and because aerobic phosphorus absorption bacterium number amount is more, so while
The aerobic phosphorus absorption time is also shorter, but aerobic phosphorus absorption is still more abundant than what denitrifying phosphorus uptake was carried out, so after long-term cultivation, following
Ring cycle T is 4 minutes (To=Tn=2 minutes) when, can still cause DPAOs/PAOs ratios to be reduced to 10% or so.
And the working condition of former anaerobism-oxidation ditch system and system circulation cycle T after transformation for 4 minutes when it is similar, it is therefore former
Anaerobism-oxidation ditch system fails while reaching denitrogenation dephosphorizing rate higher.
It follows that cycle period influences whether the growing state of Denitrifying Phosphate Accumulating Organisms, and then this influences whether oxidation again
The effect of ditch denitrogenation dephosphorizing.
Bibliography
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Claims (2)
1. a kind of anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, anaerobic pond (2) by pipeline successively with oxidation ditch pool (3),
Sedimentation basin (4), threeway (6), the water inlet end connection of sludge reflux pump (5), the water side of sludge reflux pump (5) passes through pipeline and detests
Oxygen pond (2) connects；Water inlet pipe (1) is provided with the side wall of anaerobic pond (2)；Threeway (6) is connected with excess sludge delivery pipe (7)；
The top of sedimentation basin (4) is provided with outlet pipe (8)；Agitator (9) is internally provided with anaerobic pond (2)；It is characterized in that, in oxidation
Ditch pond (3) inner bottom part is evenly arranged with micro-hole aerator (10), micro-hole aerator (10) by pipeline be arranged on oxidation ditch pool
(3) blast aeration machine (11) connection outward, blast aeration machine (11) is connected with time switch (12), in the gallery starting ends of side
The first underwater propeller (13) is provided with line position available depth 1/2nd, opposite side gallery starting ends midline position has
The second underwater propeller (14) is provided with the effect depth of water 1/2nd.
2. a kind of operating method of the anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, it is characterized in that comprising the following steps：
(1) use a kind of anaerobism-oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, anaerobic pond (2) by pipeline successively with oxidation ditch
Pond (3), sedimentation basin (4), threeway (6), the water inlet end connection of sludge reflux pump (5), the water side of sludge reflux pump (5) is by pipe
Road is connected with anaerobic pond (2)；Water inlet pipe (1) is provided with the side wall of anaerobic pond (2)；Threeway (6) and excess sludge delivery pipe (7)
Connection；The top of sedimentation basin (4) is provided with outlet pipe (8)；Agitator (9) is internally provided with anaerobic pond (2)；It is characterized in that,
Be evenly arranged with micro-hole aerator (10) in oxidation ditch pool (3) inner bottom part, micro-hole aerator (10) by pipeline be arranged on oxygen
Hua Gou ponds (3) blast aeration machine (11) connection outward, blast aeration machine (11) is connected with time switch (12), the starting of side gallery
The first underwater propeller (13), opposite side gallery starting ends center line are provided with end midline position available depth 1/2nd
The second underwater propeller (14) is provided with position available depth 1/2nd；
(2) raw sewage is flowed into anaerobic pond (2) from water inlet pipe (1), while the returned sludge in autoprecipitation in future pond (4) is returned through sludge
Stream pump (5) pumps into anaerobic pond (2), and raw sewage and returned sludge mix in the presence of agitator (9), the muddy water mixed solution of formation
Oxidation ditch pool (3) is flowed into, the first underwater propeller (13) and the second underwater propeller (14), oxidation ditch pool (3) interior muddy water is opened
Mixed liquor is in gallery internal circulation flow；Blast aeration machine (11) is controlled to open and close by time switch (12), blast aeration machine
(11) operation T is openedoMinute, by micro-hole aerator (10) to oxidation ditch pool (3) oxygen supply, blast aeration machine air demand will make To
Time internal oxidition ditch pond mixed liquor dissolved oxygen mean concentration is more than or equal to 2.0mg/L, and then blast aeration machine (11) is continuously off
TnMinute；To+Tn=T, T are a cycle period, 4 minutes≤To≤ 9 minutes, 4 minutes≤Tn≤ 9 minutes, and To=Tn；Oxidation
Ditch pond (3) interior muddy water mixed solution flows into sedimentation basin (4) through pipeline；Sedimentation basin (4) supernatant liquor is discharged through outlet pipe (8), precipitation
Pond (4) base sludge part pumps into anaerobic pond (2) through sludge reflux pump (5), and another part is by threeway (6) through excess sludge
Delivery pipe (7) is discharged.
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| CN110357255A (en) * | 2019-07-04 | 2019-10-22 | 天津创业环保集团股份有限公司 | A kind of high-efficient denitrification and dephosphorization oxidation ditch |
| CN115028266A (en) * | 2021-07-14 | 2022-09-09 | 上海泓济环保科技股份有限公司 | Oxidation ditch and oxygen supply combined equipment and non-shutdown upgrading and transforming method thereof |
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| CN110357255A (en) * | 2019-07-04 | 2019-10-22 | 天津创业环保集团股份有限公司 | A kind of high-efficient denitrification and dephosphorization oxidation ditch |
| CN115028266A (en) * | 2021-07-14 | 2022-09-09 | 上海泓济环保科技股份有限公司 | Oxidation ditch and oxygen supply combined equipment and non-shutdown upgrading and transforming method thereof |
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