CN105923761B - A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge - Google Patents
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge Download PDFInfo
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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
- C02F3/28—Anaerobic digestion processes
- C02F3/282—Anaerobic digestion processes using anaerobic sequencing batch reactors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention belongs to water treatment fields, and in particular to a kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge.Anaerobic stages or anoxic phases of the present invention in denitrifying phosphorus removal technique add Fe2+Salt reinforced phosphor-removing.The big feature of one is the Fe other than having the characteristics of chemical dephosphorization2+The Bacterial community of salt added in also changeable activated sludge, promotes the effect of biological phosphate-eliminating.
Description
Technical field
The invention belongs to water treatment fields, and in particular to the side of ferrous salt reinforced phosphor-removing in a kind of denitrification dephosphorization sludge
Method.
Background technique
Water eutrophication is all the severe problem of environmental pollution of a comparison all the time, and is increasingly aggravated, nitrogen phosphorus
It is excessively the main reason for leading to water eutrophication.Sewage treatment deep phosphorous removal denitrogenation is the key that solve nitrogen and phosphorus pollution.Mesh
Before, most domestic sewage treatment plant executes level-one A standard, however, for some major river valleys and water conservation district, due to
The special role of its water resource requires the discharge standard of pollutant more harsh.Moreover, water resources in china is seriously deficient, with
Problem of water saving sharpening and public environment consciousness enhancing, surface water IV class, Group III water quality indicator as discharge standard
It is increasingly becoming trend, wherein surface water Group III standard total phosphorus emission request is 0.2mg/L or less.It is especially regional in south China,
The problem of the generally existing carbon source deficiency of city domestic sewage, A2O, traditional denitrification dephosphorization technique such as oxidation ditch due to competition carbon source with
The intrinsic contradictions such as sludge age are difficult to realize water outlet nitrogen phosphorus qualified discharge simultaneously.
Continually developing and furtheing investigate with technology, denitrifying phosphorus removal technique become sewage treatment hot spot technology it
One.Denitrifying phosphorus removal technique refers to the absorption and removal for carrying out phosphorus while denitrification denitrogenation using Denitrifying Phosphate Accumulating Organisms.Instead
Nitrification polyP bacteria is a kind of microorganism that using nitrate nitrogen or nitrite nitrogen as electron acceptor can inhale phosphorus.Thus, denitrification dephosphorization
Technique has significant advantage when handling low-carbon-source domestic wastewater.According to nitrifier and denitrifying phosphorus removing bacteria in denitrification dephosphorization system
The location of in system, denitrifying phosphorus removal technique is broadly divided into single sludge processes and two sludge system.
In double sludge denitrifying phosphorus removal techniques, nitrifier and Denitrifying Phosphate Accumulating Organisms are independently survived in two sets of sludge systems
In, due to suitable growing environment, it can become dominant microflora.Two sets of mutually independent sludge system, that is, aerobic sludge systems
With denitrification dephosphorization sludge system.Therefore, two sludge system has more the representativeness of denitrification dephosphorization, and typical double sludges are anti-
Nitrification and phosphorus removal technique such as A2The basic procedure of N technique, technique is as shown in Figure 1.
The technique is made of anaerobic pond, sedimentation basin 1, nitrification tank, sedimentation basin 2, anoxic pond, rear aeration tank, two sedimentation basins.Work
When skill is run, sewage initially enters anaerobic pond completion and releases phosphorus, and stores a large amount of polymer in the cell.Muddy water after releasing phosphorus
Mixed liquor enters sedimentation basin 1 and carries out mud-water separation.The sludge of sedimentation basin 1 cross nitrification tank enter anoxic pond carry out denitrification remove
Phosphorus, the supernatant of sedimentation basin 1 enter nitrification tank, carry out nitrification and remove ammonia nitrogen.Then nitrification tank mixed liquor enters sedimentation basin 2
Carry out mud-water separation, sludge reflux to nitrification tank, supernatant enter anoxic pond with surmount sludge mix progress denitrification denitrogenation and
Dephosphorization, last mixed liquor aeration tank after enter secondary settling tank and carry out mud-water separation.Secondary settling tank sludge a part returns to anaerobic pond, and one
Drain for excess sludge part.
SBR technique is batch-type sludge method, is that a kind of structure type is simple, the method for operation is flexible and changeable, spatially complete
It mixes entirely, the biological method for treating waste water of time coideal plug-flow.Its operating condition is using intermittently operated as main feature.Such as
Fruit selects the reasonable SBR method of operation and is controlled to factors such as the dissolved oxygens for the treatment of process, can denitrification dephosphorization is thin
Bacterium domestication is trained dominant bacteria, to be conducive to the generation of denitrification dephosphorization denitrification.
Typical denitrifying phosphorus removal technique water outlet total phosphorus can reach level-one A standard, still, in the condition for not increasing sludge volume
Under, it is difficult to realize the discharge of total phosphorus higher standard；When phosphorus load of intaking is relatively high, water outlet total phosphorus is also increased accordingly, even if increasing
It processes skill sludge volume and is also difficult to realize water outlet total phosphorus qualified discharge.
For the dephosphorization for reaching higher standard, currently, in A2O, in SBR technique, the mode of collaboration dephosphorization can be used, i.e., in A2O
Aerobic section end or SBR aeration phase finally, add chemical agent into activated Sludge System, and it is molten in sewage
A series of physical-chemical reaction occurs for solution property phosphorus, the calcium phosphate precipitation of slightly solubility is generated, to achieve the purpose that phosphorus ligands.
Chemical auxiliary dephosphorization has many advantages, such as that removal efficiency is high, the fast, phosphor-removing effect that plays a role is stablized.Currently, Ca2+Salt, Al3+Salt, Fe3 +Salt and Fe2+Equal metallic salts are all most common chemical dephosphorization medicament all the time, wherein Fe2+Salt have it is cheap, by
Temperature influences the advantages that small, strong to the affinity of microorganism, and the application in chemical dephosphorization is more extensive.But to being at present
Only, Fe2+The application of auxiliary dephosphorization technology is main or based in aerobic sludge system；About Fe2+Chemical auxiliary dephosphorization skill
Application of the art in denitrification sludge system is more rare.
Above-mentioned chemical auxiliary dephosphorization method method mainly occurs chemical reaction by aluminium, iron metal ion and phosphorus and generates phosphorus
Hydrochlorate precipitating, realizes the removal of phosphorus.In actual use, aluminium phosphorus molar ratio, the theoretical value of iron phosphorus molar ratio are 1.0, still
It is influenced by aluminium ion, iron ion hydrolysis, in practical applications, aluminium phosphorus molar ratio, iron phosphorus molar ratio are typically larger than 2.0.This
It brings a series of problem: 1, increasing the cost of adding of agent；2, it is excessive to increase sludge quantity；3, the work of activated sludge is influenced
Property.Therefore it is unable to adding for long-term, high-dose.
Though such as the prior art CN101973629A and CN102603064A disclose a kind of ferrous anti-nitre of progress of use respectively
The technique for eliminating phosphorus, but its toss area, dosage and dosing method are conventional method, are mainly used for aerobic sludge processing, also,
Its ferrous additive amount is high, can cause secondary pollution in the subsequent process.
Summary of the invention
In view of the problems existing in the prior art, the present invention is directed to denitrifying phosphorus removal technique, before not increasing technique unit
It puts, has invented a kind of Fe2+The reinforced phosphor-removing technology of salt, the maximum with the prior art is the difference is that the present invention can strengthen life
Object dephosphorization, to realize the high standard dephosphorization of denitrification nitrogen and phosphorus removal technique.
The present invention is realized by following optimal technical scheme: anaerobic stages or anoxic phases in denitrifying phosphorus removal technique
Add Fe2+Salt reinforced phosphor-removing.The denitrifying phosphorus removal technique refer to using denitrifying phosphorus removing bacteria as functional microorganism realization synchronize it is de-
The technique of nitrogen dephosphorization.The denitrifying phosphorus removal technique includes two stages of anaerobism and anoxic, releases phosphorus, In in anaerobic stages
Denitrifying phosphorus uptake occurs for anoxic phases.Fe2+Salt adds the anaerobic stages or anoxic phases that position is denitrifying phosphorus removal technique.
Fe2+The dosage of salt is Fe2+The dosage of salt and the molar ratio of dephosphorization incrementss are 0.2~1:1, more preferred molar ratio
For 0.3~0.5:1.Fe2+The dosing method of salt is that interval adds, and after persistently adding 10~30 days, stops adding, works as Process for Effluent
When dephosphorization efficiency reduces, restores to add, circuit sequentially.
Difference of the present invention relative to previous methods:
1, toss area is different.Anaerobic pond or anoxic pond of the present invention in two sludge system add Fe2+Salt dephosphorization；
2, dosage is different.Fe of the present invention2+The dosage of salt is less；
3, dosing method is different.Prior art employing mode (1): it persistently adds；Employing mode (2) of the present invention: interval is thrown
Add, after persistently adding 10~30 days, stop adding, when Process for Effluent dephosphorization efficiency reduces, restores to add, circuit sequentially；
4, effect is different.Iron phosphorus molar ratio of the present invention not amplitude reduction is lower than stoichiometric ratio；
5, mechanism is different.Method was chemical dephosphorization in the past；The present invention is enhanced biological phosphorus removal, while some chemistry removes
Phosphorus.
6, using difference.Method was entirely to be used for aerobic sludge system in the past, and the present invention is that the denitrification of anaerobic/anoxic removes
In phosphorus technique.
Compared with the prior art, the beneficial effects of the invention include:
1. present invention selection Fe2+Salt as Dephosphorization reagent, the big feature of one be other than having the characteristics of chemical dephosphorization,
Fe2+The Bacterial community of salt added in also changeable activated sludge, promotes the effect of biological phosphate-eliminating.Fe2+Salt adds, biology
The combination of method and chemical method, there is preferable phosphor-removing effect, and what Process for Effluent can be stable reaches level-one A standard or higher standard.
2. needing to add less chemical agent, reagent cost can be greatlyd save.
3. denitrifying phosphorus removal technique itself is using denitrifying phosphorus removing bacteria, denitrogenation dephosphorizing can greatly reduce to carbon source simultaneously
Competition.
4. the chemical sludge amount generated is far smaller than reduced biological sludge amount.
5. stopping adds Fe2+Salt, system can also keep extraordinary phosphor-removing effect.
Detailed description of the invention
Fig. 1 A2N process flow diagram
Specific embodiment
Below with reference to embodiment and attached drawing, the present invention is described in further detail, but the embodiment invented is not limited to
This.
Embodiment one:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge, is run using sbr reactor device.Be arranged 3 groups it is anti-
Nitrification and phosphorus removal sludge system sbr reactor device, dischargeable capacity 2L, inflow 1.2L.According to sludge in denitrifying phosphorus removal technique
The operating parameter of system sets each phases-time of sbr reactor device, and is controlled by microcomputer time-controlled switch.Instead
Nitrification and phosphorus removal sludge system sbr reactor device uses daily 3 periods, and each cycle time is set as into water 15min, anaerobism section
2.0h, anoxic section 3.5h, it is aerated 1.0h, precipitating 1.0h afterwards, drains 15min.Anaerobism end is pumped into a certain amount of nitrate concentrate,
Spoil disposal ratio is 1/30.
Water inlet uses artificial distribution, phosphorus concentration 4mg/L.For 3 groups of denitrification dephosphorization sludge system SBR devices, first
Group is that blank group does not add Fe2+Salt, second group puts into 5mg/ to the anaerobic stages of denitrification dephosphorization sludge system sbr reactor device
L Fe2+Salt, second group puts into 5mg/L ferrous sulfate concentrate to the anoxic phases of denitrification dephosphorization sludge system sbr reactor device.
The results showed that the phosphorus concentration of first group of blank group water outlet is 0.85mg/L；Second group of water outlet phosphorus concentration is 0.30mg/L,
Removal rate compared to first group of phosphorus has been respectively increased 14.50%；The water outlet phosphorus concentration of third group is 0.25mg/L, compared to the
The removal rate of one group of phosphorus has been respectively increased 15.75%.Using method of the invention, total phosphorus in sewage treatment process water outlet can be made to contain
Amount mentions mark to ground Table IV class (total phosphorus content is lower than 0.3mg/L) standard.
Embodiment two:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge, is run using sbr reactor device.Be arranged 3 groups it is anti-
Nitrification and phosphorus removal sludge system sbr reactor device, dischargeable capacity 2L, inflow 1.2L.According to sludge in denitrifying phosphorus removal technique
The operating parameter of system sets each phases-time of sbr reactor device, and is controlled by microcomputer time-controlled switch.Instead
Nitrification and phosphorus removal sludge system sbr reactor device uses daily 3 periods, and each cycle time is set as into water 15min, anaerobism section
2.0h, anoxic section 3.5h, it is aerated 1.0h, precipitating 1.0h afterwards, drains 15min.Anaerobism end is pumped into a certain amount of nitrate concentrate,
Spoil disposal ratio is 1/30.
Water inlet uses artificial distribution, phosphorus concentration 12.5mg/L.For 3 groups of denitrification dephosphorization sludge system SBR devices,
One group does not add Fe for blank group2+Salt, second group puts into the anaerobic stages of denitrification dephosphorization sludge system sbr reactor device
20mg/L Fe2+Salt, second group puts into 20mg/L ferrous sulfate to the anoxic phases of denitrification dephosphorization sludge system sbr reactor device
Concentrate.The results showed that the phosphorus concentration of first group of blank group water outlet is 1.35mg/L；Second group of water outlet phosphorus concentration is
0.48mg/L, the removal rate compared to first group of phosphorus have been respectively increased 6.96%；The water outlet phosphorus concentration of third group is 0.45mg/L,
Removal rate compared to first group of phosphorus has been respectively increased 7.20%.Using method of the invention, sewage treatment process can be made to be discharged
Middle total phosphorus content mentions mark to ground Table IV class (total phosphorus content is lower than 0.5mg/L) mark from level-one B standard (total phosphorus content is lower than 1mg/L)
It is quasi-.
Embodiment three:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge, using A2N process operation.It has studied and adds Fe2 +To two sludge system (A2N technique, as shown in Figure 1) phosphor-removing effect influence, water inlet phosphorus concentration be 4mg/L, Fe2+Dosage
For 3mg/L.The result shows that not adding Fe2+When, it is 1.26mg/L that two sludge system, which is discharged average phosphorous concentration,；And anaerobic pond adds
Fe2+Concentration is 3mg/L, water outlet phosphorus concentration be 0.08mg/L, can stablize up to surface water IV class standard (total phosphorus content be lower than 0.3mg/
L), Fe is added to anoxic pond2+Concentration is 3mg/L, and water outlet phosphorus concentration is 0.06mg/L, can also be stablized up to surface water IV class standard.
Example IV:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge, using A2N process operation.It has studied and adds Fe2 +To two sludge system (A2N technique, as shown in Figure 1) phosphor-removing effect influence, water inlet phosphorus concentration be 4mg/L, to anoxic pond throwing
Add Fe2+Concentration is 3mg/L, Fe2+The dosing method of salt is that interval adds, and after persistently adding 15 days, stops adding, when technique goes out
When water dephosphorization efficiency reduces, restores to add, circuit sequentially.The results showed that in A2N technique adds Fe2+Continuous service 15 days
Afterwards, stop adding Fe2+, the phosphorus concentration of the Process for Effluent still maintains original level in 20 days later, consistently lower than
0.2mg/L illustrates to stop adding Fe2+Salt, system can also keep extraordinary phosphor-removing effect, can greatly reduce process operation mistake
Fe in journey2+The dosage of salt.
Embodiment five:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge, using A2N process operation.Have studied double sludge
Technique (A2N technique, as shown in Figure 1) add Fe2+Afterwards in each reactor mud sample Bacterial community.Technique water inlet phosphorus concentration be
4mg/L, water inlet phosphorus concentration are 4mg/L, Fe2+Dosage is 3mg/L.To not adding Fe2+, anaerobism just add Fe2+It is just thrown with anoxic
Add Fe2+The ratio of polyP bacteria is analyzed in mud sample.It is compared by microorganism sequence and local sequence database,
As a result, it has been found that adding Fe for a long time in denitrification dephosphorization sludge system2+The ratio of salt, polyP bacteria dramatically increases.
The above content is the further details of explanations for combining specific preferred embodiment to be the present invention, but not
Indicate that specific implementation of the invention is limited to these explanations.For the those of ordinary skill for restraining neck belonging to the present invention,
Without departing from the inventive concept of the premise, several simple deductions or replacement can also be made, is regarded as belonging to the present invention
Protection scope.
Claims (3)
1. a kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization sludge, which is characterized in that denitrifying phosphorus removal technique is double
Sludge A2N technique, A2N technique is phosphorus-containing wastewater → anaerobic pond → 1 → nitrification tank of sedimentation basin → 2 → anoxic pond of sedimentation basin → rear exposure
Gas pond → secondary settling tank → water outlet, wherein the sludge that surmounts of sedimentation basin 1 enters anoxic pond, the sludge reflux of sedimentation basin 2 to nitrification tank
Perhaps drain the sludge reflux of secondary settling tank to anaerobic pond or drain, include two stages of anaerobism and anoxic, in anaerobic stages
Phosphorus is released, denitrifying phosphorus uptake occurs in anoxic phases；Anaerobic stages or anoxic phases in denitrifying phosphorus removal technique add
Fe2+Salt reinforced phosphor-removing, described add just are thrown for anaerobism just throwing or anoxic, Fe2+The dosage of salt and the molar ratio of dephosphorization incrementss
For 0.3~0.5:1.
2. the method according to claim 1, wherein Fe2+The dosing method of salt is that interval adds, and persistently adds 10
After~30 days, stop adding, when Process for Effluent dephosphorization efficiency reduces, restores to add, circuit sequentially.
3. the method according to claim 1, wherein the denitrifying phosphorus removal technique refers to denitrifying phosphorus removing bacteria
The technique for realizing synchronous denitrification dephosphorizing for functional microorganism.
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| JPH04166297A (en) * | 1990-10-29 | 1992-06-12 | Meidensha Corp | Treatment of simultaneous removal of nitrogen and phosphorous and method for mixed integral incubation of nitrification bacteria and phosphorous accumulative bacteria |
| KR100236650B1 (en) * | 1997-08-05 | 2000-01-15 | 김헌출 | A plant for biologically denitrifying and removing phosphorus in sewage using denitrifying phosphorous removing bacteria |
| CN101857345B (en) * | 2010-06-22 | 2012-02-08 | 哈尔滨工业大学深圳研究生院 | Aeration biological filter pool device and process for efficiently denitrifying and dephosphorizing |
| CN103663686B (en) * | 2013-11-12 | 2014-11-05 | 同济大学 | Hydrolytic acidification-catalyzed iron/anaerobic-aerobic biological dephosphorization coupling process |
| CN104556572B (en) * | 2014-12-26 | 2016-08-24 | 江苏艾特克环境工程设计研究院有限公司 | A kind of method of waste water high-efficiency biochemical denitrification dephosphorization |
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