CN108751413A - The circulating anoxic of long residence time strengthens town sewage denitrification and dephosphorization method - Google Patents
The circulating anoxic of long residence time strengthens town sewage denitrification and dephosphorization method Download PDFInfo
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- CN108751413A CN108751413A CN201810662924.6A CN201810662924A CN108751413A CN 108751413 A CN108751413 A CN 108751413A CN 201810662924 A CN201810662924 A CN 201810662924A CN 108751413 A CN108751413 A CN 108751413A
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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
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
The invention discloses a kind of circulating anoxics of long residence time to strengthen town sewage denitrification and dephosphorization method, and described method includes following steps：Sewage passes through anaerobic reation pool, hypoxia response pond, aerobic reaction tank and sedimentation basin successively after setting pot, the wherein described hypoxia response pond is circulating irrigation canals and ditches type hypoxia response pond, the bosom in circulating irrigation canals and ditches type hypoxia response pond is separated along X direction by partition wall, mechanical stirring device is provided at left and right sides of partition wall, anaerobic pond water enters circulating irrigation canals and ditches type hypoxia response pond by side, sewage circulates in circulating irrigation canals and ditches type hypoxia response pond according to mixing direction, and water outlet exits into aerobic reaction tank and sedimentation basin through the other side.The method of the present invention uses the extended thought of anoxic pond, while applying the hypoxia response pond for the circulating flowing for promoting graininess hydrolysis of organic matter, and graininess organic matter can be promoted in the Efficient Conversion of anoxic pond, sufficient carbon source is provided for biological carbon and phosphorous removal phosphorus.
Description
Technical field
The invention belongs to technical field of sewage, are related to a kind of town sewage of the processing organic matter of graininess containing high proportion
Strengthen nitrogen phosphorus ligands method.
Background technology
The main object of town domestic sewage removal is organic matter and nitrogen phosphorus, and the technique of generally use is detesting for continuum micromeehanics
Oxygen-anaerobic-aerobic（Often claim AAO）The circulating type active sludge of activated sludge process and intermittent water inflow（Often claim CASS）Technique is answered
It is continuous flow AAO activated sludge process with more.This continuous flow AAO technological processes are as shown in Figure 1, setting pot is discharged
Graininess organic matter is removed into primary sedimentation tank, the colloid and dissolved organic matter in subsequent water enter the ponds anaerobism A（anaerobic
Pond, the ponds abbreviation anaerobism A）, the ponds anoxic A（The ponds anoxic, abbreviation anoxic pond）And aerobic tank（The ponds oxic, the ponds abbreviation O）, connect thereafter
Sedimentation basin needs sludge reflux pump by the sludge lifting of sedimentation basin to anaerobic pond, it is also desirable to have nitrification liquid in process operation
Mixed liquor of the aerobic tank end containing nitrate nitrogen is promoted to anoxic pond by reflux pump.
In this AAO active artistics, activated sludge also contains in addition to the heterotroph containing a large amount of aerobic degradation organic matter
There are polyP bacteria, denitrifying bacterium and nitrifier, the functional flora of this 4 kinds main removal Sewage Pollution objects is distributed in AAO works
Skill each unit.
In AAO techniques, anaerobic reactor major function is release phosphorus, while hydrolysis and the organic nitrogen of partial organic substances
Ammonification, when the water inlet of the ponds anaerobism A is containing enough small organic molecules, polyP bacteria can be using these small organic molecules
Carbon source stores anakinetomer polyhydroxyalkanoates in vivo（Abbreviation PHA）, the energy of this process is completed in polyP bacteria body
ATP is converted into the energy of ADP releases, and while ATP is converted into ADP, phosphate is just released to polyP bacteria and enters in vitro
In active sludge intermixture, during anaerobic reaction, the hydrolysis for also having partial organic substances becomes small organic molecule and has
Machine nitrogen is converted into ammonia nitrogen.
The major function of anoxic reacter is the hydrolysis of denitrification denitrogenation and partial organic substances, subsequent phosphatic mixing
Liquid is put into the ponds anoxic A, and the hydrolytic process of graininess organic matter is on the one hand completed in anoxic pond, on the one hand completes denitrification mistake
Journey, the bioavailable carbon source part not utilized by polyP bacteria utilize completion denitrification process, denitrifying bacterium by denitrifying bacteria
It is carbon source nitrate reduction that aerobic tank flows back as nitrogen that can utilize small organic molecule using organism in water.The anti-nitre in the ponds anoxic A
Change the small organic molecule that a carbon source part is not consumed by polyP bacteria in raw water, a part is being lacked from graininess organic matter
Oxygen pond is hydrolyzed into small organic molecule.
Then complete the nitric acid of the organic matter degradation under heterotrophic bacteria effect, the ammonia nitrogen under nitrifier effect in the subsequent aerobic ponds O
Aerobic excessive consumption phosphorus under salt conversion and polyP bacteria effect.In AAO techniques, organic matter in sewage anaerobism, anoxic and
Aerobic tank obtains different degrees of removal；Organic nitrogen is converted to ammonia nitrogen quickly in anaerobic pond, is converted to again in aerobic tank ammonia nitrogen
Nitrate nitrogen, circulates in anoxic pond in subsequent nitrate warp and completes denitrification and be converted to nitrogen；Phosphorus in water inlet is then in systems
It under the action of polyP bacteria, completes excessive consumption in aerobic tank and is discharged through the excess sludge of sedimentation basin bottom, in intaking in this way
Organic matter, nitrogen phosphorus are all adequately removed.This AAO techniques applied at present, nitrogen phosphorus, organic matter and indicator of suspended solids can be with
Meet country《Urban wastewater treatment firm pollutant emission standard》（GB 18918-2002）Level-one B standard.
With perfect and networking industrial wastewater treatment dynamics the reinforcement of urban drainage pipe network, many town sewage plants in China
There is the problem of carbon source deficiency, carbon source is not enough to complete anaerobic phosphorus release and the anti-nitre of anoxic in the water after precipitating graininess organic matter
Change, the organism in water after precipitation is remaining less after carbon source being utilized to complete anaerobic phosphorus release, is difficult to complete to carbon source deficiency occur
The problem of anoxic denitrification.To solve the problems, such as that carbon source deficiency, many sewage treatment plants just need to add carbon source to anoxic pond, this
Operating cost is increased, the sewage treatment plant also having is not intended to add carbon source, it is desirable that primary sedimentation tank is omitted in technological design, profit
It is denitrifying carbon source with the graininess organic matter in sewage, thus using no primary sedimentation tank AAO denitrification dephosphorization techniques, as shown in Figure 2.
This no primary sedimentation tank AAO denitrification dephosphorization techniques occur nitrogen phosphorus ligands energy force difference and aerobic operation energy in engineer application
High problem is consumed, this is because AAO bio-reaction systems are entered in the graininess organic matter of primary sedimentation tank removal originally, it is traditional
The ponds anaerobism A and the ponds anoxic A of AAO biosystems are typically designed to 2 ~ 4 hours, graininess organic matter under the so short residence time
It cannot be fully hydrolyzed into bioavailable small-molecule substance, this simple way for saving primary sedimentation tank fails to solve denitrification carbon
The problem of problem of source deficiency, other side be these graininess organic matters penetrate the ponds anaerobism A and the ponds anoxic A enter it is aerobic anti-
Ying Chi, graininess organic matter are completed to degrade, increase the load of aerobic reaction tank, also result in the increasing of operation energy consumption in aerobic tank
Add, the effective aerobic reaction time is used for the conversion of graininess organic matter, also affects aerobic nitrification and aerobic excessive suction phosphorus
Effect, and then the simple sedimentation basin processing sanitary sewage nitrogen phosphorus that omits occur and be discharged exceeded situation.
Invention content
It cannot effectively be converted in biological reaction pool for graininess organic matter, make up that denitrification denitrogenation carbon source is insufficient to ask
Topic, the present invention provides a kind of circulating anoxics of long residence time to strengthen town sewage denitrification and dephosphorization method.The process employs
The extended thought of anoxic pond, while the hypoxia response pond for the circulating flowing for promoting graininess hydrolysis of organic matter is applied, it can promote
Into graininess organic matter in the Efficient Conversion of anoxic pond, sufficient carbon source is provided for biological carbon and phosphorous removal phosphorus.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of circulating anoxic reinforcing town sewage denitrification and dephosphorization method of long residence time, includes the following steps：
Sewage passes through anaerobic reation pool, hypoxia response pond, aerobic reaction tank and sedimentation basin successively after setting pot, wherein：It is described
Hypoxia response pond is circulating irrigation canals and ditches type hypoxia response pond, and the bosom in circulating irrigation canals and ditches type hypoxia response pond is along X direction
It is separated by partition wall, mechanical stirring device is provided at left and right sides of partition wall, anaerobic pond water enters circulating irrigation canals and ditches type by side
Hypoxia response pond, sewage circulate in circulating irrigation canals and ditches type hypoxia response pond according to mixing direction, are discharged through another effluent
Go out and enter aerobic reaction tank and sedimentation basin, residence time of the anaerobic pond water in circulating irrigation canals and ditches type hypoxia response pond is 6 ~ 8
Hour.
Method provided by the invention is a kind of no primary sedimentation tank town domestic sewage reinforcing nitrogen phosphorus processing method, works as town sewage
When the AAO denitrogenation dephosphorizing treatment process of primary sedimentation tank is omitted in selection, graininess organic matter cannot be abundant in anaerobism and anoxic section in water
It is converted into bioavailable organic matter, on the one hand influences Nitrogen/Phosphorus Removal, on the other hand these graininess organic matters pass through and detest
Oxygen and anoxic Duan Houhui increase the reaction load of aerobic section and increase operating cost.This extension hypoxia response time and application follow
The method of ring type reaction tank can promote graininess organic matter in the Efficient Conversion of anoxic pond, provide and fill for biological carbon and phosphorous removal phosphorus
The carbon source of foot.
Compared with prior art, the present invention has the advantages that：
（1）The present invention is converted into bioavailable carbon as early as possible in order to accelerate graininess organic matter in town sewage, it is proposed that length is stopped
The thought of time enhanced hydrolysis is stayed, hypoxic exposure is extended, the smooth implementation of denitrification process is on the one hand ensured, on the other hand also promotees
Graininess organic matter is converted into bioavailable organic matter as early as possible in being discharged into anaerobism section.
（2）Graininess organic matter flows out from anoxic pond and increases the load of aerobic treatment unit the present invention in order to prevent,
Anoxic section proposes the reaction formation of circulating fluidised form, by circulating for mixed liquor, promotes graininess organic to greatest extent
Conversion of the object to bioavailable carbon provides sufficient carbon source for biological carbon and phosphorous removal phosphorus, also improves sewage to a certain extent
Impact resistance of the treatment plant to variation water quality.
（3）2 ~ 4 hours usual residence times of conventional plug-flow anoxic pond, since plug-flow designs, graininess organic matter can only
One-way flow, to be susceptible to the low problem of graininess hydrolysis of organic matter efficiency.The present invention is by the extension of anoxic pond and lacks
The improvement of oxygen pond pond type enhances the hydrolysis of graininess organic matter in water, compensates for that carbon source in denitrification process is insufficient to ask
Topic.
（4）The circulating anoxic AAO denitrification dephosphorization techniques water outlet of long residence time provided by the invention can meet《Town sewage
Treatment plant's discharge standard》（GB/18918-2002）Level-one B water outlets require, and can meet after being followed by sand filtration《Urban wastewater treatment firm
Discharge standard》（GB/18918-2002）Level-one A water outlets require.
（5）The present invention devises a kind of circulating irrigation canals and ditches type anoxic denitrification pond type, while extending the anoxic residence time, carries
The transformation efficiency of high graininess organic matter.
（6）After anaerobic pond water outlet enters circulating anoxic pond in the present invention, is repeatedly back and forth flowed in irrigation canals and ditches, overcome tradition
The defect of pulling flow type anoxic pond all-in and all-out has the ability of very strong anti-change of water quality.
（7）The present invention is suitable for not designing the town sewage plant construction of primary sedimentation tank, can be used for new construction and existing engineering
Transformation.
Description of the drawings
Fig. 1 is traditional AAO denitrification dephosphorization technique flow charts；
Fig. 2 is no primary sedimentation tank AAO denitrification dephosphorization technique flow charts；
Fig. 3 is the structural schematic diagram of circulating anoxic pond；
Fig. 4 is the structural schematic diagram of conventional plug-flow anoxic pond；
Fig. 5 is the circulating anoxic AAO denitrification dephosphorization technique flow charts of long residence time.
Specific implementation mode
Technical scheme of the present invention is further described below in conjunction with the accompanying drawings, however, it is not limited to this, every to this
Inventive technique scheme is modified or replaced equivalently, and without departing from the spirit of the technical scheme of the invention and range, should all be covered
In protection scope of the present invention.
The present invention provides a kind of circulating anoxics of long residence time to strengthen town sewage denitrification and dephosphorization method, is running this
Have when technique, in reaction tank and tame ripe activated sludge, in sludge other than the heterotroph containing degradation of organic substances, also contains
PolyP bacteria, denitrifying bacterium and nitrifier.As shown in figure 5, sewage after setting pot, passes through anaerobic reation pool, circulating ditch successively
Canal type hypoxia response pond, aerobic reaction tank and sedimentation basin.The residence time of the anaerobic reation pool and pond type can be with traditional AAO
Denitrification dephosphorization technique is consistent, i.e. 2 ~ 4 hours residence times, also uses the pond type of plug-flow similar to Figure 4, anaerobism main
The release action of phosphorus is completed, while discharging phosphorus, the small organic molecule in sewage is utilized by polyP bacteria.Then contain a large amount of
The mud and sewage mixture of graininess organic matter enters circulating irrigation canals and ditches type hypoxia response pond.As shown in figure 3, circulating irrigation canals and ditches type lacks
The characteristics of oxygen reaction tank is to use irrigation canals and ditches pattern, and anaerobic pond water enters circulating irrigation canals and ditches type hypoxia response pond by side, intermediate
It is separated with partition wall, at both ends, setting mechanical stirring device makes sewage be circulated according to mixing direction, and water outlet is flowed out through the other side,
Into follow-up aerobic reaction tank and sedimentation basin.Residence time in circulating irrigation canals and ditches type hypoxia response pond can reach 6 ~ 8 hours,
Due to the design of irrigation canals and ditches type, graininess organic matter can back and forth flow in anoxic pond, to promote turning for graininess organic matter
Change effect.
In the present invention, for hydrolysis acidification technology between aerobic between anaerobic technology, it passes through the hydrolysis and production of amphimicrobian
Insoluble hydrolysis of organic matter in sewage is dissolved organic matter by acetic bacterial, by macromolecular organic pollution materials difficult to degrade
The small-molecule substance of some easily biological-degradables is converted into improve Biodegradability of Wastewater.The stage is carried out in control hydrolysis acidification
Many influence factors in, sewage circulating irrigation canals and ditches type hypoxia response pond realize hydrolysis residence time be one critically important
Influence factor, it directly affects the operational effect of hydrolytic tank.It is new to generate if Hydrolysis Acidification hydraulic detention time is long
Small-molecule substance（Such as acetic acid）The gasifying stage that anaerobic fermentation may be entered improves Biodegradability of Wastewater to be not achieved
Purpose；Otherwise it is too short, the purpose of removal pollutant is not achieved, therefore that the present invention claims sewage is anti-in circulating irrigation canals and ditches type anoxic
The hydraulic detention time of Ying Chizhong is 6 ~ 8 hours.
In the present invention, underwater propeller can be used in the agitating device in circulating irrigation canals and ditches type hypoxia response pond（Motor is in water
Under）, vertical pivot blender can also be used（Motor is on the water）.
In the present invention, sludge concentration in anaerobic reation pool, hypoxia response pond, aerobic reaction tank and sedimentation basin is 2000 ~
4000mg/L, sludge age are 15 ~ 20d.
In the present invention, low temperature season（Water temperature is less than 15 degree）Ferric trichloride auxiliary dephosphorization can be added in aerobic tank latter end, thrown
Dosage is 15 ~ 25mg/L.
In the present invention, dissolving solution oxygen concentration is that one of most important parameters of AAO process operations control and water factory are energy-efficient
It is crucial.The aerobic ponds O can be energy saving by segmentation control oxygen, considers Nitrogen/Phosphorus Removal and sludge activity, phosphorus release rate, anti-nitre
Change rate, the optimal control oxygen method of operation is：It is aerobic it is preceding 1/3 keep dissolved oxygen be 1 ~ 1.5mg/L, stage casing dissolved oxygen be 2 ~ 3mg/L,
Latter end dissolved oxygen is 3 ~ 4mg/L.
Present invention experiment has run 2 sets of AAO reactors, and the anoxic residence time extended to 6 hours by 3 hours, reactor
Denitrification is apparent, and system total nitrogen promotes 10% or more.
Claims (7)
1. a kind of circulating anoxic of long residence time strengthens town sewage denitrification and dephosphorization method, include the following steps：Sewage is through heavy
Pass through anaerobic reation pool, hypoxia response pond, aerobic reaction tank and sedimentation basin behind sand pond successively, it is characterised in that the hypoxia response
Pond is circulating irrigation canals and ditches type hypoxia response pond, and the bosom in circulating irrigation canals and ditches type hypoxia response pond is divided along X direction by partition wall
It opens, mechanical stirring device is provided at left and right sides of partition wall, anaerobic pond water enters circulating irrigation canals and ditches type hypoxia response pond by side,
Sewage circulates in circulating irrigation canals and ditches type hypoxia response pond according to mixing direction, and water outlet exits into aerobic anti-through the other side
Answer pond and sedimentation basin.
2. the circulating anoxic of long residence time according to claim 1 strengthens town sewage denitrification and dephosphorization method, feature
It is that residence time of the anaerobic pond water in circulating irrigation canals and ditches type hypoxia response pond is 6 ~ 8 hours.
3. the circulating anoxic of long residence time according to claim 1 strengthens town sewage denitrification and dephosphorization method, feature
It is that the agitating device uses underwater propeller or vertical pivot blender.
4. the circulating anoxic of long residence time according to claim 1 strengthens town sewage denitrification and dephosphorization method, feature
It is that the sludge concentration in the anaerobic reation pool, hypoxia response pond, aerobic reaction tank and sedimentation basin is 2000 ~ 4000mg/L,
Sludge age is 15 ~ 20d.
5. the circulating anoxic of long residence time according to claim 1 strengthens town sewage denitrification and dephosphorization method, feature
When being that the sewage water temperature is less than 15 DEG C, ferric trichloride auxiliary dephosphorization is added in aerobic reaction tank latter end.
6. the circulating anoxic of long residence time according to claim 5 strengthens town sewage denitrification and dephosphorization method, feature
It is that the dosage of the ferric trichloride is 15 ~ 25mg/L.
7. the circulating anoxic of long residence time according to claim 1 strengthens town sewage denitrification and dephosphorization method, feature
It is that the aerobic reaction tank controls the oxygen method of operation by segmentation, wherein：Aerobic preceding 1/3 keeps dissolved oxygen for 1 ~ 1.5mg/L, in
Section dissolved oxygen is 2 ~ 3mg/L, and latter end dissolved oxygen is 3 ~ 4mg/L.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110255820A (en) * | 2019-06-26 | 2019-09-20 | 安徽建筑大学 | A kind of low-carbon-source bio-denitrifying sewage system and method using pulling flow type anoxic pond |
| CN111439835A (en) * | 2020-03-13 | 2020-07-24 | 中山大学 | Sewage treatment method and device for rapidly realizing denitrification dephosphorization |
| CN116253433A (en) * | 2023-01-11 | 2023-06-13 | 北京林业大学 | Sewage efficient denitrification and dephosphorization process and system based on iron biochemical conversion |
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| CN106830582A (en) * | 2017-04-21 | 2017-06-13 | 哈尔滨工业大学 | A kind of processing method of low biochemical cities and towns industrial park sewage |
| WO2018221924A1 (en) * | 2017-05-29 | 2018-12-06 | 서울과학기술대학교 산학협력단 | Sewage treatment system based on anaerobic ammonium oxidation method in water treatment process in sewage treatment plant |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103951059A (en) * | 2014-04-08 | 2014-07-30 | 河海大学 | Multi-cycle composite bioreactor and process thereof |
| CN106830582A (en) * | 2017-04-21 | 2017-06-13 | 哈尔滨工业大学 | A kind of processing method of low biochemical cities and towns industrial park sewage |
| WO2018221924A1 (en) * | 2017-05-29 | 2018-12-06 | 서울과학기술대학교 산학협력단 | Sewage treatment system based on anaerobic ammonium oxidation method in water treatment process in sewage treatment plant |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110255820A (en) * | 2019-06-26 | 2019-09-20 | 安徽建筑大学 | A kind of low-carbon-source bio-denitrifying sewage system and method using pulling flow type anoxic pond |
| CN111439835A (en) * | 2020-03-13 | 2020-07-24 | 中山大学 | Sewage treatment method and device for rapidly realizing denitrification dephosphorization |
| CN116253433A (en) * | 2023-01-11 | 2023-06-13 | 北京林业大学 | Sewage efficient denitrification and dephosphorization process and system based on iron biochemical conversion |
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Application publication date: 20181106 |