CN106745743A - A kind of sewage denitrification dephosphorization system - Google Patents
A kind of sewage denitrification dephosphorization system Download PDFInfo
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Abstract
The invention provides a kind of sewage denitrification dephosphorization system, including anaerobic pond, mud-water separation unit, de-nitrification unit, anoxic pond, Aerobic Pond and second pond.Wherein, raw water enters anaerobic pond with the returned sludge 1 of second pond, anaerobic pond mixed liquor enters mud-water separation unit, mud-water separation unit supernatant enters de-nitrification unit with second pond returned sludge 2, de-nitrification unit mixed liquor and mud-water separation unit sludge enter anoxic pond, and anoxic pond mixed liquor sequentially enters Aerobic Pond and second pond.The advanced nitrogen dephosphorization of the achievable urban wastewater treatment of the present invention, is not only suitable for newly-built Sewage Plant, is also easy to realize the transformation to built sewage treatment plant.
Description
Technical field
The invention belongs to technical field of sewage, and in particular to sewage denitrification and dephosphorization treatment.
Technical background
The efficient removal of nitrogen phosphorus is always the emphasis and difficult point of urban wastewater treatment, and tail water nitrogen phosphorus is not up to standard easily to cause water
The serious water pollution problems such as body eutrophication.Promulgate within 2002《Urban wastewater treatment firm pollutant emission standard》
(GB18918-2002) emission request higher is had also been proposed to sewage disposal, specific standards are NH4 +- N≤5mg/L, TN≤
15mg/L, TP≤0.5mg/L (one-level A standards).Some local governments have worked out tightened up discharge standard, such as Beijing
《Water pollution comprehensive discharge standard》(D11/307-2013).Therefore, the construction of newly-built Sewage Plant changes with the upgrading of built Sewage Plant
Make an urgent demand for all suffering from advanced nitrogen dephosphorization.
Traditional denitrification dephosphorization technique respectively depends on denitrification microorganism and each completes denitrogenation and dephosphorization with dephosphorization microorganism
Process.Biological denitrificaion is that ammonia nitrogen is eventually converted into the mistake that nitrogen is removed from system in the presence of nitrifier and denitrifying bacterium
Journey.The mechanism of biological denitrificaion mainly includes three processes：Ammoniation, nitrification and denitrification.First, aerobic or
In the environment of anaerobism, the itrogenous organic substance in sewage is decomposed into ammoniacal nitrogen in the presence of amonifying bacteria.Secondly, ammonia nitrogen (NH4 +-
N nitrate nitrogen (NO) is converted into the presence of nitrifier3 -- N), this process includes two stages of reaction, first stage ammonia before this
Nitrogen is converted into nitrite nitrogen (NO in the presence of nitrococcus2 -- N), second stage is nitrite nitrogen in the presence of nitrifier
It is converted into nitrate nitrogen.Finally, denitrifying bacterium will be produced under anoxic conditions using organic carbon source as electron donor in nitrifying process
Nitrite nitrogen or nitrate-nitrogen reduction be nitrogen.Biological phosphate-eliminating principle takes the photograph phosphorus/release for polymer phosphate salt accumulation microorganism (PAO)
Phosphorus principle, i.e., be easily enriched with class polyP bacteria (PAO) microorganism in the environment of aerobic/anaerobic alternate run, and it can exceed that it
Psychological need is substantial amounts of to absorb phosphate from external environment condition, and is stored in vivo, by residue in the form of polymeric phosphate
The form discharge system of sludge, realizes the removal of phosphorus.Biological Phosphorus Removal Process includes two processes of anaerobic phosphorus release and aerobic phosphorus absorption.
Biological denitrification phosphorous removal technique mainly includes anaerobism, aerobic and anaerobic environment, by space or on the time to difference
The purpose of phosphorus is denitrogenated in the change of unit to reach.Sewage treatment plant is most widely used at present A2/ O techniques, oxidation ditch work
Skill etc..A2/ O and oxidation ditch process as current sewage disposal prevailing technology, the denitrification process for existing and dephosphorization process carbon source
The problems such as competition, nitrifier and polyP bacteria sludge age contradiction, nitrate backflow influence anaerobic phosphorus release, in city domestic sewage
Nitrogen phosphorus ligands scarce capacity.To reach preferable Nitrogen/Phosphorus Removal, A2/ O and oxidation ditch process are to water-inlet carbon source concentration requirement
It is higher.But many cities of China, especially Shelter in South China Cities, universal carbon source deficiency (i.e. carbon-nitrogen ratio is low), A in sanitary sewage2/O
It is even more with the total nitrogen and total phosphorus of oxidation ditch process water outlet and is difficult to qualified discharge simultaneously.
Continued to develop as denitrogenation dephosphorizing is theoretical, researcher is found that the phenomenon of suction phosphorus under anaerobic environment, it is proposed that
Denitrification dephosphorization is theoretical.Under anaerobic environment, Denitrifying Phosphate Accumulating Organisms (DPB) release PAO during phosphorus process and traditional dephosphorization
Release that phosphorus process is identical, i.e., in phosphorus to the water in Microbiological release body, while absorbing organic matter from water with PHA (poly- hydroxy aliphatics
Acid, mainly PHB --- poly butyric) form be stored into vivo；Under anaerobic environment, different from aerobic phosphorous accumulating bacterium
(PAO) with O2It is electron acceptor, DPB is with NO3 -As the internal carbon source PHB stored in electron acceptor oxysome, the energy energy of generation
For the orthophosphates in excess ingestion solution, and stored in the cell in the form of polymeric phosphate.In denitrification dephosphorization mistake
Carbon source is realized synchronous denitrification denitrogenation by way of " carbon is dual-purpose " and inhales phosphorus effect in journey, saves the need to carbon source
Ask, while aeration rate and sludge yield are also reduced, for the sanitary sewage great potential for processing low ratio of carbon to ammonium.
Various denitrification dephosphorization techniques are developed based on denitrification dephosphorization theory.According to Denitrifying Phosphate Accumulating Organisms with nitrifier anti-
Existence form in nitrification and phosphorus removal system, denitrifying phosphorus removal technique is segmented into single sludge denitrification denitrogenation handling process and double
Sludge denitrifying phosphorus removal technique.BCFs techniques are typical list sludge denitrification dephosphorization process, are the modifications of UCT techniques.From
Seen in technological process, BCFS techniques are in original A2On the basis of/O techniques, contact chamber is increased in anaerobic pond rear end, in anoxic section
Mixing pit is increased afterwards.Mixing returned sludge and the mixed liquor from anaerobic pond are used to adsorb residual organic substances, removal backflow
Nitrate nitrogen in sludge.Mixing pit synchronizes nitration denitrification between anoxic pond and Aerobic Pond under anoxia condition, reduce
Water outlet total nitrogen, it is ensured that water outlet total nitrogen is up to standard.First route is mainly lowered into anaerobic pond as far as possible in three interior circulations
Nitrate concentration, it is ensured that the anaerobic condition of anaerobic pond；Article 2 route auxiliary reflux sludge purpose is to supplement nitric acid to anoxic pond
Salt, Article 3 route is mainly nitrification liquid backflow and advantageously reduces water outlet ammonia nitrogen.The process reflows are more, run more complicated, discomfort
Close to A2The transformation of/O techniques.
Two sludge system is based on the theoretical typical process of double sludge denitrification dephosphorization.Raw water is with returned sludge in anaerobic pond
COD in sewage is converted into PHB storages in vivo by mixing, Denitrifying Phosphate Accumulating Organisms, while discharging phosphorus；During mixed liquor enters afterwards
Between sedimentation basin carry out mud-water separation, supernatant enters nitrification tank, and sludge is then directly entered anoxic pond and carries out denitrifying phosphorus uptake, afterwards
The phosphorus ligands and stripping nitrogen that will do not removed are aerated after, Mud up-floating is prevented.Technique COD in anaerobic pond is used to detest
Oxygen releases phosphorus and synthesizes PHB, and PHB be used to realize simultaneous denitrification and the dephosphorization of system in mixing pit, reach saving carbon source
Purpose, be adapted to low ratio of carbon to ammonium sewage disposal.Further, since technique is set to double sludge systems, by polyP bacteria and nitrifier
It is respectively placed in different reactors, it is ensured that the growth cycle of nitrifier, and then increased nitrification bacterium amount and improves nitrification effect
Rate, while being well understood that the contradiction of SRT in traditional handicraft of having determined so that polyP bacteria and nitrifier are all in each optimal environment
Growth so that system stable and high effective operation.But two sludge system needs two sets of sludge systems, increased construction cost.
Conventional A2/ O techniques, oxidation ditch process run for anaerobic- anoxic- oxic, and itself has the bar of denitrification dephosphorization
Part, but denitrification dephosphorization ability is but very weak in technique in actual motion.Anti- nitre can only be partly realized by improved UCT
Eliminate phosphorus；Although BCFS denitrification dephosphorization degree is higher, many, technique that flows back is more complicated, is not suitable for A2/ O, oxidation ditch work
Skill is transformed；Two sludge system needs two sets of sludge systems, and construction cost is high.Therefore, using denitrification dephosphorization principle, exploitation is a kind of
New single sludge processes suitable for the transformation of built Sewage Plant are significant.
The content of the invention
In view of the problem that prior art is present, the invention provides a kind of new sewage with denitrification dephosphorization function
Advanced nitrogen dephosphorization handling process, substantially, total nitrogen and total phosphorus content reduction, can effectively solve sewage to Nitrogen/Phosphorus Removal in water outlet
Treatment difficult problem up to standard.The present invention is applied to the newly-built and transformation of the town sewage plant for having denitrogenation dephosphorizing requirement, is also suitable
Processed in the denitrogenation dephosphorizing of the industrial wastewater to good biodegradability.
Sewage denitrification dephosphorization system of the present invention includes：By anaerobic pond, mud-water separation unit, anoxic pond, Aerobic Pond, two
Heavy pond is connected in sequence, and is additionally provided with de-nitrification unit, wherein, anaerobic pond is provided with the import of raw water, second pond returned sludge 1
Into anaerobic pond, de-nitrification unit contains nitrification tank, and the supernatant that mud-water separation unit is separate enters nitre with second pond returned sludge 2
Change unit, mixed liquor and the sludge of mud-water separation unit outflow of de-nitrification unit outflow enter anoxic pond, and it is mixed that anoxic pond flows out
Close liquid and enter Aerobic Pond, the mixed liquor of Aerobic Pond outflow enters second pond, and second pond is provided with delivery port and sludge outlet.
Anaerobic pond of the present invention includes：Anaerobic pond is provided with the import of raw water and second pond returned sludge 1.The original
Water can be the sewage for entering Sewage Plant, or enter after Sewage Plant by pretreatment (such as the treatment such as grid, sand setting, just heavy)
Sewage.Anaerobic pond is stirred, and sewage and sludge are sufficiently mixed, are reacted.Stirring is generally using machinery or hydraulic mixing side
Formula, air stirring is not used to avoid introducing dissolved oxygen.Reaction in anaerobic pond refers to microorganism (i.e. activated sludge) low molten
Bioprocess in the environment of solution oxygen, low nitrate nitrogen concentration, i.e. phosphorus in releaser, the organic matter in intake water are formed to internal
PHB.Under normal circumstances, dissolved oxygen is required in anaerobic pond<0.2mg/L, nitrate<0.5mg/L, too high dissolved oxygen and nitre
State nitrogen concentration will suppress the anaerobic reaction of microorganism.Anaerobic pond can be arranged to many lattice ponds series system, it would however also be possible to employ follow
Ring mode, or combination.The hydraulic detention time of anaerobic pond is according to sludge concentration, pollutant concentration, water temperature, water outlet requirement
Designed etc. factor, generally 1.0~4.0 hours.
As a further improvement on the present invention, raw water can enter anaerobic pond, a part of raw water using segmental influent mode
Into the initiating terminal of anaerobic pond, mix with the second pond returned sludge 1 for entering anaerobic pond, another part raw water is from after initiating terminal
Position enter anaerobic pond.Returned sludge from second pond contains nitrate nitrogen, detests hence into influence is possible to after anaerobic pond
The anaerobic processes (release phosphorus and intake organic matter) in oxygen pond, by a part of raw water (raw water 1, usually the 10 of raw water total amount~30%)
First mix with second pond returned sludge 1, the raw water (raw water 2) of remainder is intake from after anaerobic pond initiating terminal, realization is being detested
The purpose of the nitrate nitrogen in leading portion (before i.e. raw water 2 enters) the removal returned sludge 1 in oxygen pond, so as to avoid nitrate nitrogen to anaerobism
The influence of pond back segment (after i.e. raw water 2 enters), the hydraulic detention time of anaerobic pond leading portion typically takes 20~60 minutes.
The mixed liquor that mud-water separation unit of the present invention flows out anaerobic pond carries out mud-water separation.Mud-water separation unit
It is provided with import, supernatant outlet, sludge outlet.Mixed liquor from anaerobic pond carries out mud from import into mud-water separation unit
After water is separated, supernatant flows out to de-nitrification unit, and the sludge of bottom flows out to anoxic pond.Mixed liquor described here refer to sewage and
The mixture of solids；Higher dense of ratio anaerobic pond mixed liquor solid content (solids content) that obtains in mud-water separation unit bottom
Contracting liquid, referred to as sludge；The low water of the solid content that obtains on mud-water separation unit top, referred to as supernatant.Mud-water separation unit
Hydraulic detention time is designed according to factors such as sludge concentration, separative efficiencies, generally 0.5~3.0 hour.
De-nitrification unit of the present invention contains nitrification tank, and second pond is provided with sludge reflux and enters de-nitrification unit, and two sink
Pond returned sludge 2 completes nitration reaction with the supernatant from mud-water separation unit in de-nitrification unit, is then out to anoxic
Pond.The hydraulic detention time of nitrification tank is designed according to factors such as sludge concentration, pollutant concentration, water temperature, water outlet requirements, typically
It is 2.0~8.0 hours.
As a further improvement on the present invention, de-nitrification unit can be only nitrification tank, and water inlet is from mud-water separation unit
Clear liquid and second pond returned sludge 2, are realized oxygenation and are mixed in pond by aeration, and microorganism aoxidizes water under aerobic environment
In ammonia nitrogen, generate nitrate nitrogen.The nitrification efficiency of nitrification tank is high, and reason is：One be second pond returned sludge before reflow
Aerobic Pond, second pond are flowed through, sufficient aerobe reaction has been have passed through in Aerobic Pond, organic matter has been consumed, and keeps away
The influence of Organic Matters on Nitrification is exempted from；Two be the supernatant of mud-water separation unit by the anaerobic processes of anaerobic pond, it is organic
Thing major part has been transferred into microbial body, it also avoid the influence of Organic Matters on Nitrification.It is reinforcing nitration reaction,
Also biologic packing material can be installed additional in nitrification tank.
As a further improvement on the present invention, de-nitrification unit can be the combination of mixing pit and nitrification tank, mud-water separation list
First supernatant enters mixing pit with second pond returned sludge 2, then enters back into nitrification tank.By machinery, waterpower etc. in mixing pit
The mode of stirring is thoroughly mixed muddy water, is not aerated, not oxygenation；Aeration in nitrification tank.Because second pond returned sludge contains nitre
State nitrogen, mud-water separation unit supernatant still contains organic matter (COD is higher in raw water, then COD is also higher in supernatant), mixing pit
Be provided with beneficial to making full use of the organic matter in mud-water separation unit supernatant to remove the nitrate nitrogen in returned sludge 2, have
Help, more efficiently using the carbon source in raw water, improve denitrification effect.On the other hand, the setting of mixing pit can further drop
The organic concentration of low entrance nitrification tank, is conducive to improving the nitrification effect of nitrification tank.The residence time of mixing pit is generally 20
~120 minutes, the residence time of nitrification tank was generally 2.0~8.0 hours.
The water inlet (mud) of anoxic pond of the present invention is including the mixed liquor from de-nitrification unit and from mud-water separation list
Mixed, reacted by the stirring such as machinery, waterpower in the sludge of unit, anoxic pond.Reaction in anoxic pond refers to microorganism profit
Denitrification is carried out with organic matter and nitrate nitrogen, while by oxidation operation, by nitrate-nitrogen reduction into nitrogen.Of the present invention
Anoxic pond in, organic matter is mainly stored in microbial body in PHB forms, it is denitrifying simultaneously, be capable of achieving synchronization dephosphorization,
Particularly with low-carbon and nitrogen sewage, realize that a carbon is dual-purpose, the Nitrogen/Phosphorus Removal of sewage can be increased substantially.Do not exposed in anoxic pond
Gas, not oxygenation, dissolved oxygen requirement are as far as possible low, are generally not to be exceeded 0.5mg/L, are beneficial to the anoxic denitrification process of microorganism.
The design hydraulic detention time of anoxic pond is selected according to factors such as sludge concentration, pollutant concentration, water temperature, water outlet requirements, and one
As be 1.5~5.0 hours.
The water inlet of Aerobic Pond of the present invention comes from anoxic pond, and Aerobic Pond is stirred and oxygenation using aeration.Micro- life
Thing under aerobic conditions, further go water removal in organic matter, ammonia nitrogen, while further reducing phosphorus in water by aerobic phosphorus absorption
Concentration.With traditional A2/ O techniques are compared, and in the systems described in the present invention, organic matter, ammonia nitrogen, phosphorus major part are in Aerobic Pond
Unit before is removed, and the effect of Aerobic Pond is more thoroughly to remove water pollutant.When raw water quality is preferable, pollutant contains
When measuring relatively low, it is possible to reduce the residence time of Aerobic Pond, or the aeration rate of reduction Aerobic Pond, the master of Aerobic Pond in the process of running
It is nitrogen in stripping anoxic pond produced by denitrification to act on, it is to avoid sludge causes containing tiny bubble cannot be normal in second pond
Precipitation.The design hydraulic detention time of Aerobic Pond is selected according to factors such as sludge concentration, pollutant concentration, water temperature, water outlet requirements
Select, generally 0.5~5.0 hour.
As a further improvement on the present invention, the nitrification liquid return line from Aerobic Pond to anoxic pond can be set, will be aerobic
Anoxic pond is transported to by nitrification liquid return line by the mixed liquor of reaction in pond.Return line can be Aerobic Pond to anoxic
The forms such as pipeline, channel, the perforated wall in pond.Reaction in Aerobic Pond refers to that the aerobe in microorganism under aerobic environment is made
With in this role, the ammonia nitrogen in sewage is oxidized to nitrate nitrogen, and the mixed liquor rich in nitrate nitrogen is also referred to as nitrification liquid.Nitre
Change liquid reflux ratio (referring to the ratio between flow and raw water flow of nitrification liquid) and be generally 0~200%, during running,
Design parameter and ruuning situation according to other units in the concentration and Effluent criteria, system of pollutant (especially total nitrogen) etc. because
Element adjustment reflux ratio, or according to water outlet total nitrogen situation up to standard, real-time adjustment reflux ratio.For example, when water inlet total nitrogen concentration (example not high
Such as<45mg/L), water outlet for one-level A standards go out when, reflux ratio desirable 0% is not turned on nitrification liquid backflow, when water inlet total nitrogen is dense
Degree is high (for example>45mg/L) or during Effluent criteria (such as≤10mg/L) high, nitrification liquid backflow is started, when using nitrification liquid backflow
Can strengthened denitrification effect, raising nitrogen removal rate.Traditional A2In/O and oxidation ditch process, to realize denitrification, it is necessary to set nitre
Change liquid backflow, to reach denitrification effect higher, mixed liquid recycle ratio generally reaches 100~300%.
Second pond of the present invention is provided with two sets of sludge refluxes and respectively enters anaerobic pond and de-nitrification unit, and second pond will
Mixed liquor from Aerobic Pond carries out precipitate and separate, and supernatant flows out as water outlet, and a sludge part for precipitation is back to anaerobism
Pond (returned sludge 1) a, part is back to de-nitrification unit (returned sludge 2), and a part carries out emission treatment as excess sludge.
Generally concentrated after excess sludge discharge, be dehydrated etc. and to process.Returned sludge 1 and returned sludge 2 can be independently arranged sludge reflux
Pump or shared sludge reflux pump.
As a further improvement on the present invention, chemical dephosphorization unit can be set, chemical dephosphorization unit includes reaction tank and sinks
Shallow lake pond, the 5~30% of mud-water separation unit supernatant enters chemical dephosphorization unit, and chemical dephosphorization medicament is first added in reaction tank
And stir, react, subsequently into sedimentation basin, the supernatant after precipitation enters de-nitrification unit, and sludge carries out emission treatment.Due to mud
Water separative element supernatant phosphorus concentration generally reaches more than 2~4 times of raw water phosphorus concentration, even if therefore 5~30% supernatant
Liquid carries out dephosphorization treatment, can also increase substantially the dephosphorization ability of system.
The technique detailed process of aforementioned system includes：
A. raw water enters anaerobic pond；
B. the mixed liquor after anaerobic pond treatment enters mud-water separation unit；
C. the sludge after mud-water separation cell processing enters anoxic pond, and supernatant enters de-nitrification unit；
D. the mixed liquor after de-nitrification unit treatment enters anoxic pond；
As a further improvement on the present invention, de-nitrification unit can set different forms.
D01：De-nitrification unit is only nitrification tank；
D02：De-nitrification unit includes mixing pit and and nitrification tank.
E. the mixed liquor of anoxic pond enters Aerobic Pond；
As a further improvement on the present invention, nitrification liquid return line can be set between Aerobic Pond and anoxic pond, will be aerobic
Anoxic pond is transported to by nitrification liquid return line by the mixed liquor of reaction in pond.
F. the mixed liquor of Aerobic Pond enters second pond；
G. the sludge that second pond is produced is flowed back and is discharged, and supernatant flows out as water outlet.Precipitate the part for producing
To anaerobic pond, to de-nitrification unit, other sludge are discharged a part of sludge reflux sludge reflux as excess sludge.
Beneficial effect relative to prior art of the invention, including but not limited to：
(1) instant invention overcomes A2The denitrogenation dephosphorizing scarce capacity problem that/O, oxidation ditch process are present, takes off with good
Nitrogen phosphor-removing effect, especially for the treatment of the sewage of low ratio of carbon to ammonium, it is possible to resolve denitrifying carbon source deficiency problem and water outlet total nitrogen
With total phosphorus difficulty up to standard.
(2) returned sludge of second pond is introduced de-nitrification unit by system of the present invention, and de-nitrification unit includes nitrification tank, profit
Nitrified with activated sludge.Relative activity sludge and the two sludge system of filler combination, reduce a set of sludge system, reduce
The use of filler, effectively prevent filler and installs and the work such as change, and reduce construction cost, simplify operation maintenance expense.
Relative to the two sludge system that activated sludge is combined with activated sludge, it is to avoid set sedimentation basin after nitrification tank, occupation of land face is reduced
Product, construction and operating cost.
(3) nitrification efficiency of the nitrification tank in system of the present invention is high.When organic matter in system (dissolved organic matter,
Organic matter in activated sludge body) be sufficiently consumed after, organic matter influences very little to the nitrification of activated sludge, activated sludge
Rate of nitrification can be improved significantly.Conventional A2The techniques such as/O, oxidation ditch, due to the presence of organic matter, leading portion in Aerobic Pond
Nitrification efficiency it is low.In the present invention, one is that second pond returned sludge has flowed through Aerobic Pond, second pond before reflow, aerobic
Sufficient aerobe reaction is have passed through in pond, organic matter has been consumed, it is to avoid the influence of Organic Matters on Nitrification；
Two be the supernatant of mud-water separation unit by the anaerobic processes of anaerobic pond, organic matter major part has been transferred into microbial body
It is interior, it also avoid the influence of Organic Matters on Nitrification.
(4) the preposition mixing pit of nitrification tank is an important extension of the invention, its beneficial effect in de-nitrification unit of the invention
Fruit is two aspects：1. can consolidation system denitrification effect：The organic matter removal in mud-water separation unit supernatant can be made full use of
Part is from the nitrate nitrogen in second pond returned sludge 2；2. nitrification effect is strengthened：Due to the denitrification of mixing pit, reduce
Into the carbon source concentration in nitrification tank, for nitrifier provides more suitable habitat, be conducive to improving nitrification effect.
Brief description of the drawings
Fig. 1, a kind of schematic flow sheet of sewage denitrification dephosphorization system of the present invention；
Fig. 2, the different set-up mode schematic diagram of de-nitrification unit of the embodiment of the present invention 1 with 2, wherein, Fig. 2A is embodiment 1
Only nitrification tank de-nitrification unit scheme, Fig. 2 B are the de-nitrification unit scheme that the mixing pit of embodiment 2 is connected with nitrification tank；
Fig. 3, the schematic flow sheet for being provided with anaerobic pond segmental influent mode of the embodiment of the present invention 3；
Fig. 4, the schematic flow sheet for being provided with Aerobic Pond nitrification liquid return line of the embodiment of the present invention 4；
Fig. 5, the schematic flow sheet for being provided with chemical dephosphorization unit of the embodiment of the present invention 5；
Fig. 6, treatment effect figure of the present invention, wherein, the treatment effect figure of Fig. 6 A embodiments 1, the treatment effect of Fig. 6 B embodiments 2
Fruit is schemed.
Specific embodiment
Technique effect of the invention and its effective is described in further detail with reference to embodiment and accompanying drawing, is shown
Concrete form in real commercial Application, but the implementation method not limited to this invented.
Case study on implementation 1：
Sewage denitrification and dephosphorization processing system as shown in Figure 2 A, by anaerobic pond, mud-water separation unit, anoxic pond, Aerobic Pond,
Second pond is connected in sequence, and is additionally provided with de-nitrification unit.Flow of inlet water Q=10L/h, anaerobic pond is provided with raw water and second pond
The import of returned sludge 1, de-nitrification unit only includes nitrification tank, the supernatant that mud-water separation unit is separate and second pond returned sludge
2 enter nitrification tank, and mixed liquor and the sludge of mud-water separation unit outflow of nitrification tank outflow enter anoxic pond, anoxic pond outflow
Mixed liquor enters Aerobic Pond, and the mixed liquor of Aerobic Pond outflow enters second pond, and second pond is provided with delivery port, second pond sludge one
To anaerobic pond, a part is back to nitrification tank, remainder discharge to partial reflux.
Residence time (pressing in water ga(u)ge) is respectively：Anaerobic pond 2.5h, mud-water separation unit 1.5h, nitrification tank 4h, lack
The flow of oxygen pond 3.5h, Aerobic Pond 2.5h, second pond 3.0h, anaerobic pond returned sludge 1 and returned sludge 2 is 5L/h, remaining
Sludge presses sludge age for 15~20 days calculate discharge capacity, and mud-water separation supernatant flow quantity is 10L/h.
Fig. 6 A are average removal effect of the system longtime running to ammonia nitrogen, total nitrogen, total phosphorus and COD in the present embodiment.By scheming
6A is visible, and system has good Nitrogen/Phosphorus Removal to sanitary sewage, and in the case of carbon source is relatively low, water outlet total nitrogen reaches
12.1mg/L, total phosphorus 0.39mg/L, stable water outlet reach one-level A standards, and denitrogenation dephosphorizing ability is better than tradition A2/ O techniques.
Case study on implementation 2
Sewage denitrification and dephosphorization processing system as shown in Figure 2 B, by anaerobic pond, mud-water separation unit, anoxic pond, Aerobic Pond,
Second pond is connected in sequence, and is additionally provided with de-nitrification unit.Flow of inlet water Q=10L/h, anaerobic pond is provided with raw water and second pond
The import of returned sludge 1, de-nitrification unit includes mixing pit and nitrification tank, and the supernatant that mud-water separation unit is separate is returned with second pond
Stream sludge 2 enters mixing pit, and the mixed liquor of mixing pit outflow enters nitrification tank, the mixed liquor and mud-water separation list of nitrification tank outflow
The sludge of unit's outflow enters anoxic pond, and the mixed liquor of anoxic pond outflow enters Aerobic Pond, and the mixed liquor of Aerobic Pond outflow enters two
Heavy pond, second pond is provided with delivery port, and a second pond sludge part is back to anaerobic pond, and a part is back to nitrification tank, remaining
Partial discharge.
Residence time (pressing in water ga(u)ge) is respectively：Anaerobic pond 2.5h, mud-water separation unit 1.5h, mixing pit 40min,
The flow of nitrification tank 4h, anoxic pond 3.5h, Aerobic Pond 2.5h, second pond 3.0h, anaerobic pond returned sludge 1 and returned sludge 2 is equal
It is 5L/h, excess sludge presses sludge age for 15~20 days calculate discharge capacity, and mud-water separation supernatant flow quantity is 10L/h.
Compared with Example 1, the de-nitrification unit of the present embodiment increased mixing pit, and remaining setting is identical.
Fig. 6 B are average removal effect of the system longtime running to ammonia nitrogen, total nitrogen, total phosphorus and COD in the present embodiment.With reality
Apply example 1 to compare, the aqueous concentration no significant difference of total phosphorus and COD, and ammonia nitrogen reduces 0.4mg/L, total nitrogen reduces 2.0mg/
L, illustrates that the setting of mixing pit improves the denitrification ability of system.
Case study on implementation 3
Sewage denitrification and dephosphorization processing system as shown in Figure 3, by anaerobic pond, mud-water separation unit, anoxic pond, Aerobic Pond,
Second pond is connected in sequence, and is additionally provided with de-nitrification unit.Flow of inlet water Q=10L/h, anaerobic pond is provided with raw water and second pond
The import of returned sludge 1, de-nitrification unit includes mixing pit and nitrification tank, and the supernatant that mud-water separation unit is separate is returned with second pond
Stream sludge 2 enters mixing pit, and the mixed liquor of mixing pit outflow enters nitrification tank, the mixed liquor and mud-water separation list of nitrification tank outflow
The sludge of unit's outflow enters anoxic pond, and the mixed liquor of anoxic pond outflow enters Aerobic Pond, and the mixed liquor of Aerobic Pond outflow enters two
Heavy pond, second pond is provided with delivery port, and a second pond sludge part is back to anaerobic pond, and a part is back to nitrification tank, remaining
Partial discharge.
Residence time (pressing in water ga(u)ge) is respectively：Anaerobic pond 2.5h, mud-water separation unit 1.5h, mixing pit 30min,
The flow of nitrification tank 4h, anoxic pond 3.5h, Aerobic Pond 2.5h, second pond 3.0h, anaerobic pond returned sludge 1 and returned sludge 2 is equal
It is 5L/h, excess sludge presses sludge age for 15~20 days calculate discharge capacity, and mud-water separation supernatant flow quantity is 10L/h.
As different from Example 2, anaerobic pond is divided into the series connection of four lattice ponds, and raw water enters anaerobism using segmental influent mode
Pond.25% raw water enters the first lattice pond, and 75% raw water enters the second lattice pond, and returned sludge fully enters the first lattice pond.
Compared with Example 2, there was no significant difference for removal of the system to COD, ammonia nitrogen, total nitrogen；The total phosphorus of anaerobic pond water outlet
Mean concentration can improve about 1.0mg/L, and the stability of system removal total phosphorus is improved, the reduction of system water outlet total phosphorus mean concentration
0.03mg/L。
Case study on implementation 4
Sewage denitrification and dephosphorization processing system as shown in Figure 4, by anaerobic pond, mud-water separation unit, anoxic pond, Aerobic Pond,
Second pond is connected in sequence, and is additionally provided with de-nitrification unit.Flow of inlet water Q=10L/h, anaerobic pond is provided with raw water and second pond
The import of returned sludge 1, de-nitrification unit is only nitrification tank, and the supernatant of mud-water separation unit enters nitrification tank, nitrification tank outflow
The sludge of mixed liquor and mud-water separation unit outflow enter anoxic pond, the mixed liquor of anoxic pond outflow enters Aerobic Pond, aerobic
Pond is provided with nitrification liquid return line to anoxic pond, and the mixed liquor of Aerobic Pond outflow enters second pond, and second pond is provided with water outlet
Mouthful, a second pond sludge part is back to anaerobic pond, and a part is back to nitrification tank, remainder discharge.
Residence time (pressing in water ga(u)ge) is respectively：Anaerobic pond 2.5h, mud-water separation unit 1.5h, mixing pit 30min,
The flow of nitrification tank 4h, anoxic pond 3.5h, Aerobic Pond 2.5h, second pond 3.0h, anaerobic pond returned sludge 1 and returned sludge 2 is equal
It is 5L/h, excess sludge presses sludge age for 15~20 days calculate discharge capacity, and mud-water separation supernatant flow quantity is 10L/h, nitrification liquid
Capacity of returns 10L/h.
The present embodiment compared with Example 1, increased nitrification liquid backflow.From in terms of operational effect, compared with Example 1, it is
There was no significant difference for removal of the system to COD, ammonia nitrogen, total phosphorus, and the removal amount to total nitrogen improves 2.8mg/L.
Case study on implementation 5：
Sewage denitrification and dephosphorization processing system as shown in Figure 5, by anaerobic pond, mud-water separation unit, anoxic pond, Aerobic Pond,
Second pond is connected in sequence, and is additionally provided with de-nitrification unit and dephosphorization unit.Flow of inlet water Q=10L/h, anaerobic pond is provided with original
The import of water and second pond returned sludge 1, de-nitrification unit includes mixing pit and nitrification tank, the supernatant of mud-water separation unit 10%
Dephosphorization unit is entered, remaining 90% supernatant enters mixing pit, mixes with the water outlet of dephosphorization unit, second pond returned sludge 2
The mixed liquor of pond outflow enters nitrification tank, and mixed liquor and the sludge of mud-water separation unit outflow of nitrification tank outflow enter anoxic
Pond, the mixed liquor of anoxic pond outflow enters Aerobic Pond, and the mixed liquor of Aerobic Pond outflow enters second pond, and second pond is provided with water outlet
Mouthful, a second pond sludge part is back to anaerobic pond, and a part is back to nitrification tank, remainder discharge.
Residence time (pressing in water ga(u)ge) is respectively：Anaerobic pond 2.5h, mud-water separation unit 1.5h, mixing pit 30min,
Nitrification tank 4h, anoxic pond 3.5h, Aerobic Pond 2.5h, second pond 3.0h；The reaction tank 0.05h of dephosphorization unit, sedimentation basin 0.2h.Detest
The flow of oxygen pond returned sludge 1 and returned sludge 2 is 5L/h, and excess sludge presses sludge age for 15~20 days calculate discharge capacity,
Mud-water separation supernatant flow quantity is 10L/h.
As different from Example 2, embodiment adds dephosphorization unit.Compared with Example 2, system is to COD, ammonia
Nitrogen, there was no significant difference for the removal of total nitrogen, and the removal ability to phosphorus is significantly improved, and water outlet total phosphorus mean concentration is reduced to
0.12mg/L。
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
Specific implementation of the invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should be all considered as belonging to of the invention
Protection domain.
Claims (10)
1. a kind of sewage denitrification dephosphorization system, it is characterised in that：By anaerobic pond, mud-water separation unit, anoxic pond, Aerobic Pond, two
Heavy pond is connected in sequence, and is additionally provided with de-nitrification unit, wherein, anaerobic pond is provided with the import of raw water, second pond returned sludge 1
Into anaerobic pond, de-nitrification unit contains nitrification tank, and the supernatant that mud-water separation unit is separate enters nitre with second pond returned sludge 2
Change unit, mixed liquor and the sludge of mud-water separation unit outflow of de-nitrification unit outflow enter anoxic pond, and it is mixed that anoxic pond flows out
Close liquid and enter Aerobic Pond, the mixed liquor of Aerobic Pond outflow enters second pond, and second pond is provided with delivery port and sludge outlet.
2. a kind of sewage denitrification dephosphorization system according to claim 1, it is characterised in that：Anaerobic pond is provided with raw water and two
After the import of heavy pond returned sludge 1, raw water and second pond returned sludge 1 enter anaerobic pond, by stirring realization in anaerobic pond
Mixing, reaction, are then out to mud-water separation unit.
3. a kind of sewage denitrification dephosphorization system according to claim 2, it is characterised in that：Raw water uses segmental influent mode
Into anaerobic pond, a part of raw water enters the initiating terminal of anaerobic pond, mixes with the second pond returned sludge 1 for entering anaerobic pond, separately
Position of a part of raw water from after initiating terminal enters anaerobic pond.
4. a kind of sewage denitrification dephosphorization system according to claim 1, it is characterised in that：Mud-water separation unit be provided with into
Mouth, supernatant outlet, sludge outlet, the mixed liquor from anaerobic pond carry out mud-water separation from import into mud-water separation unit
Afterwards, supernatant flows out to de-nitrification unit, and sludge flows out to anoxic pond.
5. a kind of sewage denitrification dephosphorization system according to claim 1, it is characterised in that：De-nitrification unit is only nitrification tank,
Aeration is set in nitrification tank, and the supernatant from mud-water separation unit enters nitrification tank with the returned sludge 2 from second pond,
Mixing, reaction, are then out to anoxic pond in nitrification tank；Or de-nitrification unit is the combination of mixing pit and nitrification tank, from mud
The supernatant of water separative element enters mixing pit with the returned sludge 2 from second pond, is mixed by stirring in mixing pit
Close, react, subsequently into nitrification tank, mixed by aeration in nitrification tank, reacted, nitrification tank mixed liquor flows out to anoxic
Pond.
6. a kind of sewage denitrification dephosphorization system according to claim 1, it is characterised in that：Mixed liquor from de-nitrification unit
Enter anoxic pond with the sludge from mud-water separation unit, mixed by stirring in anoxic pond, reacted, be then out to
Aerobic Pond.
7. a kind of sewage denitrification dephosphorization system according to claim 1, it is characterised in that：Mixed liquor from anoxic pond enters
Enter and mixed by aeration, reacted in Aerobic Pond, Aerobic Pond, be then out to second pond.
8. a kind of sewage denitrification dephosphorization system according to claim 6 or 7, it is characterised in that：Anoxic pond and Aerobic Pond it
Between nitrification liquid return line can be set, anoxic pond will be transported to by return line by the mixed liquor of reaction in Aerobic Pond.
9. a kind of sewage denitrification dephosphorization system according to claim 1, it is characterised in that：Second pond be provided with delivery port and
Mixed liquor from Aerobic Pond is carried out precipitate and separate by sludge outlet, second pond, and supernatant flows out as water outlet, the sludge of precipitation
From sludge outlet outflow, a part is back to anaerobic pond, and a part is back to de-nitrification unit, and a part is carried out as excess sludge
Emission treatment.
10. a kind of sewage denitrification dephosphorization system according to claim 1, it is characterised in that：Settable chemical dephosphorization unit,
Chemical dephosphorization unit includes reaction tank and sedimentation basin, and the 5~30% of mud-water separation unit supernatant enters chemical dephosphorization unit, first
Chemical dephosphorization medicament is added in reaction tank and stirred, reacted, subsequently into sedimentation basin, it is single that the supernatant after precipitation enters nitrification
Unit, sludge carries out emission treatment.
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| CN108793614A (en) * | 2018-07-12 | 2018-11-13 | 军事科学院军事医学研究院环境医学与作业医学研究所 | A kind of method and its device of continous way sewage disposal |
| CN108821517A (en) * | 2018-07-31 | 2018-11-16 | 中交信远(北京)建设工程有限公司 | A kind of sewage disposal device and its processing method |
| CN109179652A (en) * | 2018-08-16 | 2019-01-11 | 海天水务集团股份公司 | A kind of low C/N is than organic wastewater denitrifying method |
| CN109293164A (en) * | 2018-11-09 | 2019-02-01 | 深圳市市政设计研究院有限公司 | A kind of method of sewage deep denitrogenation dephosphorizing |
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| CN108793614A (en) * | 2018-07-12 | 2018-11-13 | 军事科学院军事医学研究院环境医学与作业医学研究所 | A kind of method and its device of continous way sewage disposal |
| CN108793614B (en) * | 2018-07-12 | 2021-04-20 | 军事科学院军事医学研究院环境医学与作业医学研究所 | Continuous sewage treatment method and device |
| CN108821517A (en) * | 2018-07-31 | 2018-11-16 | 中交信远(北京)建设工程有限公司 | A kind of sewage disposal device and its processing method |
| CN109179652A (en) * | 2018-08-16 | 2019-01-11 | 海天水务集团股份公司 | A kind of low C/N is than organic wastewater denitrifying method |
| CN109320012A (en) * | 2018-10-26 | 2019-02-12 | 首创爱华(天津)市政环境工程有限公司 | A kind of municipal sewage system and method |
| CN109320012B (en) * | 2018-10-26 | 2021-11-09 | 首创爱华(天津)市政环境工程有限公司 | Municipal sewage treatment system and method |
| CN109293164A (en) * | 2018-11-09 | 2019-02-01 | 深圳市市政设计研究院有限公司 | A kind of method of sewage deep denitrogenation dephosphorizing |
| CN110217892B (en) * | 2019-04-28 | 2020-07-03 | 皇宝（福建）环保工程投资有限公司 | Sewage nitrogen and phosphorus removal process based on integrated biochemical reaction tank |
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| CN111847799A (en) * | 2020-08-03 | 2020-10-30 | 苏州博净源环境科技有限公司 | Method for removing nitrogen in water |
| CN113735378A (en) * | 2021-09-15 | 2021-12-03 | 北控(秦皇岛)水务有限责任公司 | Nitrogen and phosphorus removal sewage treatment system and treatment method |
| CN113735378B (en) * | 2021-09-15 | 2023-05-30 | 北控(秦皇岛)水务有限责任公司 | Sewage treatment system and method for denitrification and dephosphorization |
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| CN116239227B (en) * | 2023-04-28 | 2023-11-07 | 湖南星湘盈环保科技有限公司 | Tower type sewage treatment plant of cover |
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