CN206328209U - The anaerobic oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing - Google Patents
The anaerobic oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing Download PDFInfo
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- CN206328209U CN206328209U CN201621437700.8U CN201621437700U CN206328209U CN 206328209 U CN206328209 U CN 206328209U CN 201621437700 U CN201621437700 U CN 201621437700U CN 206328209 U CN206328209 U CN 206328209U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The utility model discloses a kind of anaerobic oxidation ditch of intensified anti-nitrated denitrogenation dephosphorizing, the anaerobic oxidation ditch is：Water inlet end of the anaerobic pond by pipeline successively with oxidation ditch pool, sedimentation basin, threeway, sludge reflux pump is connected, 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, set at side gallery starting ends midline position available depth 1/2nd and second underwater propeller is set at the first underwater propeller, opposite side gallery starting ends midline position available depth 1/2nd.The utility model does not change other operational factors, without using chemical agent, only transformed by aeration mode and aeration oxygen supply region that gallery is circulated to oxidation ditch, so that it may so that Denitrifying Phosphate Accumulating Organisms are enriched with, oxidation ditch system denitrogenation dephosphorizing can be made while reaching higher clearance.
Description
Technical field
The technical field of sewage that the utility model belongs in environmental project, is related to a kind of intensified anti-nitrated denitrogenation dephosphorizing
Anaerobism-oxidation ditch.
Background technology
With the raising of environmental protection requirement, need to carry out denitrogenation dephosphorizing while waste water control organics removal.Therefore
Oxidation ditch is circulated and increase anaerobic zone (or anaerobic pond) before gallery by many researchers, to meet the dephosphorization requirement of sewage.Oxidation ditch
Denitrification functions are realized, one of method is 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 mixed liquor circulates the length of fashionable colors in gallery in oxidation ditch, determine again mixed liquor every time in aerobic zone and
The length of anoxic zone residence time.
As shown in figure 1, mixed liquor can be characterized in the length that oxidation ditch circulates fashionable colors in gallery with (1) formula：
In formula (1)：T-cycle period, i.e. the mixed liquor circle of prevalence one 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
V-mixed liquor circulates the epidemic rate in gallery, m/s in oxidation ditch pool；
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.
It can be seen that built oxidation ditch cycle period, from a few minutes to dozens of minutes, differs greatly by data in table 1.
Oxidation ditch process for setting aerobic zone and anoxic zone 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 -It is used as electron acceptor, the poly- beta-hydroxy of organic matter of intracellular
Alkanoate (PHA) is 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 be used for denitrification denitrogenation simultaneously 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.
Utility model content
The purpose of this utility model is to take cycle period SECO there is provided a kind of intensified anti-nitrated denitrogenation dephosphorizing
Anaerobism-oxidation ditch.
The technical solution of the utility model 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
The first underwater propeller 13 is provided with 12 connections, side gallery starting ends midline position available depth 1/2nd, it is another
The second underwater propeller 14 is provided with side porch road starting ends midline position available depth 1/2nd.
The utility model has the advantages that：
(1) other operational factors are not changed, without using chemical agent, the only aeration mode by circulating gallery to oxidation ditch
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 higher clearance simultaneously.
(2) compared with the 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) simple to sewage treatment plant's reforming mode of existing setting oxidation ditch process, the cycle period that is particularly suitable for use in is small
In the transformation of the oxidation ditch sewage treatment plant of 8 points of kinds.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 anaerobism-oxidation ditch schematic diagram of intensified anti-nitrated denitrogenation dephosphorizing of the present utility model.
In Fig. 1：21 --- --- oxidation ditch pool 23 --- aeration rotary brush 24 --- underwater propellers of water inlet pipe 22
25 --- mixed liquor dissolved oxygen concentration is more than or equal to 2.0mg/L region 26 --- anoxic zone, oxygen in aerobic zone, oxidation ditch pool
Mixed liquor dissolved oxygen concentration is less than the 2.0mg/L --- sedimentation basin 28 --- returned sludge 29 --- of region 27 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.
Embodiment
The utility model is further described 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 is set
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, the second underwater propeller 14 is provided with opposite side gallery starting ends midline position available depth 1/2nd.
A kind of operating method of 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 is connected；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, the second underwater propeller 14 is provided with 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 is pumped into anaerobic pond 2, and raw sewage and returned sludge are mixed in the presence of agitator 9, and the muddy water mixed solution of formation flows into oxidation
Ditch pond 3, opens muddy water mixed solution in the first underwater propeller 13 and the second underwater propeller 14, oxidation ditch pool 3 and is followed in gallery
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, the wide B of circulation gallery is 1.5m, circulation gallery available depth H
For 1.0m, LmidFor 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 to carry 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 TnFor 1.48min, ToFor 2.22min.Raw sewage and backflow are dirty
Mud is flowed into by anaerobic pond origin or beginning water inlet, is mixed in anaerobic pond in the presence of agitator, 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/ of a kind of intensified anti-nitrated denitrogenation dephosphorizing of the present utility model
PAOs
Original anaerobism-oxidation ditch system is transformed according to the utility model, i.e., it is of the present utility model intensified anti-nitrated
Anaerobism-oxidation ditch of denitrogenation dephosphorizing, is shown in Fig. 2, anaerobism pool volume Vp=20m3, a length of 5m of anaerobic pond, a width of 2m, a height of 2m are maintained
It is constant；Oxidation ditch pool circulation gallery total measurement (volume) VCC=100m3, the wide B of circulation gallery is 1.5m, and circulation gallery available depth H is
1.0m, LmidFor 66.67m, remain 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 are mixed 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, sedimentation basin supernatant liquor is through water outlet
Pipe is discharged, and a sedimentation basin base sludge part is pumped 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/VCCFor 60%, Vn/VCCFor 40%, but in improved anaerobism-oxidation ditch system
Unite during intermittent aerating, dissolved oxygen concentration in gallery is circulated when just being closed due to aerator and is reduced to below 2.0mg/L and needs
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 longer, therefore favorably
Fully reacted in aerobic phosphorus absorption, consume more which results in PHA 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, therefore denitrification when being conducive to stopping being aerated
After the progress of poly- phosphorus reaction, long-term cultivation, DPAOs/PAOs ratios are had led to 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 it is 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 anoxic can be carried out inhale the polyP bacteria quantity of phosphorus, therefore this results 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, it can still cause DPAOs/PAOs ratios to be reduced to 10% or so.
And the working condition of former anaerobism-oxidation ditch system is similar when with system circulation cycle T after transformation being 4 minutes, thus it is former
Anaerobism-oxidation ditch system fails while reaching higher denitrogenation dephosphorizing rate.
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
[1]Alaya,S.B.；Haouech,L.；Cherif,H.；Shayeb,H.,Aeration management in
an oxidation ditch.Desalination.2010,252(1-3),172-178.
[2]Kanazawa,N.；Urushigawa,Y.,Estimation of nitrogen removal rate in
aqueous phase based on δ15N in microorganisms in solid phase.Water
Research.2007,41(15),3201-3208.
[3] the design scientific and technological information exploitation of Chen Fang Oxidation Ditch Sewage Treatment Plant of Zuoyun Counties and economic .2004,14 (8):
306-307.
[4] Zou Xiaorong, Li Hongmin, beam inner feelings China wait Wei Haigao area's Designing Sewage Treatment Plants and operation water supply and drainages
.2002,28(4):13-14.
[5] Zhou Rulu, Sun Yong, application of the wide field Carrousel oxidation ditch of horse in Coal Seam in Xinglongzhuang Mine sanitary sewage disposal
Energy environment protection .2004,18 (4):24-26.
[6]Yang,Y.；Wu,Y.；Yang,X.；Zhang,K.；Yang,J.,Flow field prediction in
full-scale Carrousel oxidation ditch by using computational fluid
dynamics.Water Science and Technology.2010,62(2),256-265.
[7]Abusam,A.；Keesman,K.J.；Spanjers,H.；Straten,G.v.,Benchmarking
procedure for full-scale activated sludge plants.Control Engineering
Practice.2004,12(3),315-322.
[8] the optimization operation water and wastewater industries market .2012 of the western Sewage Plant improvement oxidation ditch process in Chen Rui Handan, (2), 49-
52.
Claims (1)
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) is by pipeline with detesting
Oxygen pond (2) is connected；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), and micro-hole aerator (10) is by pipeline and is arranged on oxidation ditch pool
(3) blast aeration machine (11) connection outside, 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.
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