CN105923761A - Method using ferrous salt to perform enhanced phosphorus removal on sludge in denitrifying phosphorus removal - Google Patents
Method using ferrous salt to perform enhanced phosphorus removal on sludge in denitrifying phosphorus removal Download PDFInfo
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- CN105923761A CN105923761A CN201610442818.8A CN201610442818A CN105923761A CN 105923761 A CN105923761 A CN 105923761A CN 201610442818 A CN201610442818 A CN 201610442818A CN 105923761 A CN105923761 A CN 105923761A
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- salt
- phosphorus removal
- phosphorus
- dephosphorization
- sludge
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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
-
- 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
- C02F2101/105—Phosphorus compounds
Abstract
The invention belongs to the field of water treatment and particularly relates to a method using ferrous salt to perform enhanced phosphorus removal on sludge in denitrifying phosphorus removal. The method is characterized in that Fe<2+> salt is added during the anaerobic stage or oxygen deficit stage in the denitrifying phosphorus removal process to perform the enhanced phosphorus removal. The method has the advantages that the method has the features of chemical phosphorus removal, and the adding of the Fe<2+> salt can change the microbial community structure of the active sludge and promote the effect of biological phosphorus removal.
Description
Technical field
The invention belongs to water treatment field, be specifically related to the side of ferrous salt reinforced phosphor-removing in a kind of denitrification dephosphorization mud
Method.
Background technology
Body eutrophication is the most all the problem of environmental pollution that a comparison is severe, and day by day increases the weight of, nitrogen phosphorus
Excess is the main cause causing body eutrophication.Sewage disposal deep phosphorous removal denitrogenation is the key solving nitrogen and phosphorus pollution.Mesh
Before, most domestic sewage treatment plant performs one-level A standard, but, for some major river valleys and water conservation district, due to
The special role of its water resource, requires more harsh to the discharge standard of pollutant.And, water resources in china is the deficientest, with
Sharpening and the enhancing of public environment consciousness of problem of water saving, surface water IV class, Group III water quality index are as discharge standard
Being increasingly becoming trend, wherein surface water Group III standard total phosphorus emission request is below 0.2mg/L.Especially in south China area,
Generally there is the problem that carbon source is not enough, A in city domestic sewage2O, oxidation ditch etc. tradition denitrification dephosphorization technique due to competition carbon source with
The intrinsic contradictions such as sludge age, are difficulty with water outlet nitrogen phosphorus qualified discharge simultaneously.
Continually developing and furtheing investigate along with technology, denitrifying phosphorus removal technique become sewage disposal hot spot technology it
One.Denitrifying phosphorus removal technique refers to absorption and the removal utilizing Denitrifying Phosphate Accumulating Organisms to carry out phosphorus while denitrification denitrogenation.Instead
Nitrification polyP bacteria is that a class can carry out the microorganism of suction phosphorus with nitrate nitrogen or nitrite nitrogen for electron acceptor.Thus, denitrification dephosphorization
Technique has significant advantage when processing low-carbon-source domestic wastewater.According to nitrifier with denitrifying phosphorus removing bacteria in denitrification dephosphorization system
Location in system, denitrifying phosphorus removal technique is broadly divided into single sludge processes and two sludge system.
In double sludge denitrifying phosphorus removal technique, nitrifier and Denitrifying Phosphate Accumulating Organisms are independently survived and are overlapped sludge system two
In, due to suitable growing environment, dominant microflora all can be become.The sludge system i.e. aerobic sludge system that two sets are separate
With denitrification dephosphorization sludge system.Therefore, two sludge system has more the representativeness of denitrification dephosphorization, and typical double sludge are anti-
Nitrification and phosphorus removal technique such as A2N technique, the basic procedure of its technique is as shown in Figure 1.
This technique is made up of anaerobic pond, sedimentation tank 1, nitrification tank, sedimentation tank 2, anoxic pond, rear Aeration tank, two sedimentation tanks.Work
When skill is run, sewage initially enters anaerobic pond and completes to release phosphorus, and at the substantial amounts of polymer of intracellular storage.Release the muddy water after phosphorus
Mixed liquor enters sedimentation tank 1 and carries out mud-water separation.The mud of sedimentation tank 1 is crossed nitrification tank and is entered anoxic pond and carry out denitrification and remove
Phosphorus, the supernatant of sedimentation tank 1 enters nitrification tank, carries out Nitrification and removes ammonia nitrogen.Then nitrification tank mixed liquor enters sedimentation tank 2
Carry out mud-water separation, sludge reflux to nitrification tank, supernatant enter anoxic pond with surmount mud mix carry out denitrification denitrogenation and
Dephosphorization, last mixed liquor through after Aeration tank enter second pond carry out mud-water separation.A second pond mud part returns to anaerobic pond, and one
Part is drained for excess sludge.
SBR technique is batch-type sludge method, is that a kind of version is simple, the method for operation is flexible and changeable, the completeest
Full mixing, the biological method for treating waste water of time coideal plug-flow.Its operating condition is with intermittently operated as principal character.As
Fruit selects the rational SBR method of operation and is controlled by the factors such as the dissolved oxygen of processing procedure, can denitrification dephosphorization is thin
Bacterium domestication is trained dominant bacteria, thus the generation of beneficially denitrification dephosphorization denitrification.
Typical case's denitrifying phosphorus removal technique water outlet total phosphorus can reach one-level A standard, but, in the condition not increasing sludge volume
Under, it is difficulty with the discharge of total phosphorus higher standard；When phosphorus load of intaking is higher, water outlet total phosphorus improves the most therewith, even if increasing
Add technique sludge volume also to be difficult to realize water outlet total phosphorus qualified discharge.
For reaching the dephosphorization of higher standard, at present, at A2In O, SBR technique, the mode of collaborative dephosphorization can be used, i.e. at A2O
Aerobic section end, or the aeration phase of SBR is last, adds chemical agent in activated Sludge System, molten with sewage
There is a series of physical-chemical reaction in solution property phosphorus, generates the calcium phosphate precipitation of slightly solubility, thus reach the purpose of phosphorus ligands.
Chemical auxiliary dephosphorization has the advantages such as removal efficiency is high, it is fast to play a role, phosphor-removing effect is stable.At present, Ca2+Salt, Al3+Salt, Fe3 +Salt and Fe2+It is the most all the most frequently used chemical dephosphorization medicament Deng metallic salt, wherein Fe2+Salt have cheap, be subject to
Temperature impact is little, to advantages such as the affinity of microorganism are strong, the application in chemical dephosphorization is the most extensive.But, it is up till now
Only, Fe2+The application of auxiliary dephosphorization technology is main still based in aerobic sludge system；About Fe2+Chemical auxiliary dephosphorization skill
Art Application comparison in denitrification sludge system is rare.
Above-mentioned chemical auxiliary dephosphorization method method, mainly generates phosphorus by aluminum, iron metal ion with phosphorus generation chemical reaction
Hydrochlorate precipitates, it is achieved the removal of phosphorus.In actual use, aluminum phosphorus mol ratio, the theoretical value of ferrum phosphorus molar ratio are 1.0, but
By aluminium ion, iron ion hydrolyzes is affected, and in actual applications, aluminum phosphorus mol ratio, ferrum phosphorus molar ratio are typically larger than 2.0.This
Bring a series of problem: 1, add the cost of adding of agent；2, sludge quantity is increased too much；3, the work of activated sludge is affected
Property.Therefore can not the adding of long-term, high-dose.
Though such as prior art CN101973629A and CN102603064A open one respectively uses ferrous iron to carry out anti-nitre
The technique eliminating phosphorus, but its toss area, dosage and dosing method are conventional method, are mainly used in aerobic sludge and process, and,
Its ferrous addition is high, can cause secondary pollution in subsequent technique.
Summary of the invention
The problem existed in view of prior art, the present invention is directed to denitrifying phosphorus removal technique, before not increasing technique unit
Put, invented a kind of Fe2+With the maximum difference of prior art, the reinforced phosphor-removing technology of salt, is that the present invention can strengthen life
Thing dephosphorization, thus realize the high standard dephosphorization of denitrification nitrogen and phosphorus removal technique.
The present invention is realized by following optimal technical scheme: the anaerobic stages in denitrifying phosphorus removal technique or anoxic phases
Add Fe2+Salt reinforced phosphor-removing.Described denitrifying phosphorus removal technique refers to realize synchronizing to take off with denitrifying phosphorus removing bacteria for functional microorganism
The technique of nitrogen dephosphorization.Described denitrifying phosphorus removal technique includes anaerobism and two stages of anoxia, releases phosphorus at anaerobic stages,
Anoxic phases generation denitrifying phosphorus uptake.Fe2+Salt add the anaerobic stages or anoxic phases that position is denitrifying phosphorus removal technique.
Fe2+The dosage of salt is Fe2+The dosage of salt is 0.2～1:1 with the mol ratio of dephosphorization increments, mol ratio more preferably
It is 0.3～0.5:1.Fe2+The dosing method of salt adds for interval, after persistently adding 10～30 days, stops adding, works as Process for Effluent
When dephosphorization efficiency reduces, recover to add, circulate successively.
The present invention is relative to the difference of previous methods:
1, toss area is different.Present invention anaerobic pond in two sludge system or anoxic pond 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 uses mode (1): persistently add；The present invention uses mode (2): interval is thrown
Add, after persistently adding 10～30 days, stop adding, when Process for Effluent dephosphorization efficiency reduces, recover to add, circulate successively；
4, effect is different.Ferrum phosphorus mol ratio not amplitude reduction of the present invention, less than stoichiometric ratio；
5, mechanism is different.Method was chemical dephosphorization in the past；The present invention is enhanced biological phosphorus removal, and some chemistry removes simultaneously
Phosphorus.
6, application difference.Method was entirely for aerobic sludge system in the past, and the present invention is that the denitrification of anaerobic/anoxic removes
In phosphorus technique.
The present invention includes relative to the beneficial effect of prior art:
1. the present invention selects Fe2+Salt is as Dephosphorization reagent, and the big feature of one is in addition to possess outside the feature of chemical dephosphorization,
Fe2+Adding of salt also can change the Bacterial community in activated sludge, promotes the effect of biological phosphate-eliminating.Fe2+Adding of salt, biological
Method and the combination of chemical method, have preferable phosphor-removing effect, and what Process for Effluent can be stable reaches one-level A standard or higher standard.
2. have only to add less chemical agent, reagent cost can be greatly saved.
3. the available denitrifying phosphorus removing bacteria of denitrifying phosphorus removal technique denitrogenation dephosphorizing simultaneously itself can greatly reduce carbon source
Competition.
4. the chemical sludge amount produced is far smaller than the biological sludge amount of minimizing.
5. stop adding Fe2+Salt, system can also keep extraordinary phosphor-removing effect.
Accompanying drawing explanation
Fig. 1 A2N process flow diagram
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but the embodiment of invention is not limited to
This.
Embodiment one:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization mud, uses sbr reactor device to run.Arrange 3 groups anti-
Nitrification and phosphorus removal sludge system sbr reactor device, dischargeable capacity is 2L, and inflow is 1.2L.According to mud in denitrifying phosphorus removal technique
The operational factor of system, phases-time each to sbr reactor device is set, and is controlled by microcomputer time-controlled switch.Instead
Nitrification and phosphorus removal sludge system sbr reactor device uses 3 cycles of every day, and each cycle set of time is water inlet 15min, anaerobism section
2.0h, anoxia section 3.5h, rear aeration 1.0h, precipitation 1.0h, draining 15min.Anaerobism end pumps into a certain amount of nitrate concentrated solution,
Spoil disposal ratio is 1/30.
Water inlet uses artificial distribution, and phosphorus concentration is 4mg/L.For 3 groups of denitrification dephosphorization sludge system SBR devices, first
Group does not the most add Fe for blank group2+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 concentrated solution to the anoxic phases of denitrification dephosphorization sludge system sbr reactor device.
Test result indicate that: the phosphorus concentration of first group of blank group water outlet is 0.85mg/L；The water outlet phosphorus concentration of second group is 0.30mg/L,
It has been respectively increased 14.50% compared to the clearance of first group of phosphorus；The water outlet phosphorus concentration of the 3rd group is 0.25mg/L, compared to
The clearance of one group of phosphorus has been respectively increased 15.75%.The method using the present invention, can make total phosphorus in sewage treatment process water outlet contain
Amount carries mark to ground Table IV class (total phosphorus content is less than 0.3mg/L) standard.
Embodiment two:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization mud, uses sbr reactor device to run.Arrange 3 groups anti-
Nitrification and phosphorus removal sludge system sbr reactor device, dischargeable capacity is 2L, and inflow is 1.2L.According to mud in denitrifying phosphorus removal technique
The operational factor of system, phases-time each to sbr reactor device is set, and is controlled by microcomputer time-controlled switch.Instead
Nitrification and phosphorus removal sludge system sbr reactor device uses 3 cycles of every day, and each cycle set of time is water inlet 15min, anaerobism section
2.0h, anoxia section 3.5h, rear aeration 1.0h, precipitation 1.0h, draining 15min.Anaerobism end pumps into a certain amount of nitrate concentrated solution,
Spoil disposal ratio is 1/30.
Water inlet uses artificial distribution, and phosphorus concentration is 12.5mg/L.For 3 groups of denitrification dephosphorization sludge system SBR devices, the
One group does not the most 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
Concentrated solution.Test result indicate that: the phosphorus concentration of first group of blank group water outlet is 1.35mg/L；The water outlet phosphorus concentration of second group is
0.48mg/L, has been respectively increased 6.96% compared to the clearance of first group of phosphorus；The water outlet phosphorus concentration of the 3rd group is 0.45mg/L,
It has been respectively increased 7.20% compared to the clearance of first group of phosphorus.The method using the present invention, can make sewage treatment process water outlet
Middle total phosphorus content carries mark to ground Table IV class (total phosphorus content is less than 0.5mg/L) mark from one-level B standard (total phosphorus content is less than 1mg/L)
Accurate.
Embodiment three:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization mud, uses A2N process operation.Have studied and add Fe2 +To two sludge system (A2N technique, the impact of phosphor-removing effect as shown in Figure 1), water inlet phosphorus concentration is 4mg/L, Fe2+Dosage
For 3mg/L.Result shows, does not adds Fe2+Time, two sludge system water outlet average phosphorous concentration is 1.26mg/L；And anaerobic pond adds
Fe2+Concentration is 3mg/L, and water outlet phosphorus concentration is 0.08mg/L, and (total phosphorus content is less than 0.3mg/ can stably to reach surface water IV class standard
L), Fe is added to anoxic pond2+Concentration is 3mg/L, and water outlet phosphorus concentration is 0.06mg/L, it is possible to stably reach surface water IV class standard.
Embodiment four:
A kind of method of ferrous salt reinforced phosphor-removing in denitrification dephosphorization mud, uses A2N process operation.Have studied and add Fe2 +To two sludge system (A2N technique, the impact of phosphor-removing effect as shown in Figure 1), water inlet phosphorus concentration is 4mg/L, throws to anoxic pond
Add Fe2+Concentration is 3mg/L, Fe2+The dosing method of salt adds for interval, after persistently adding 15 days, stops adding, when technique goes out
When water dephosphorization efficiency reduces, recover to add, circulate successively.Test result indicate that: at A2N technique adds Fe2+Continuous service 15 days
After, stop adding Fe2+, in 20 days afterwards, the phosphorus concentration of this Process for Effluent still maintains original level, is consistently lower than
0.2mg/L, illustrates that stopping adds 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 mud, uses A2N process operation.Have studied double mud
Technique (A2N technique, adds Fe as shown in Figure 1)2+The Bacterial community of mud sample in rear each reactor.Technique water inlet phosphorus concentration is
4mg/L, water inlet phosphorus concentration is 4mg/L, Fe2+Dosage is 3mg/L.To not adding Fe2+, add Fe at the beginning of anaerobism2+Throw with at the beginning of anoxia
Add Fe2+In mud sample, the ratio of polyP bacteria is analyzed.Contrasted with local sequence library by microorganism sequence,
Found that denitrification dephosphorization sludge system is medium-term and long-term adds Fe2+Salt, the ratio of polyP bacteria dramatically increases.
Above content is to combine the further details of explanation that the present invention is done by concrete preferred implementation, but not
Represent the present invention be embodied as be limited to these explanations.For restraining the those of ordinary skill of neck belonging to the present invention,
Without departing from the inventive concept of the premise, it is also possible to make some simple deductions or replacement, be regarded as belonging to the present invention
Protection domain.
Claims (7)
1. the method for ferrous salt reinforced phosphor-removing in a denitrification dephosphorization mud, it is characterised in that in denitrifying phosphorus removal technique
Anaerobic stages or anoxic phases add Fe2+Salt reinforced phosphor-removing.
Method the most according to claim 1 and 2, it is characterised in that described denitrifying phosphorus removal technique includes anaerobism and lacks
In two stages of oxygen, release phosphorus at anaerobic stages, at anoxic phases generation denitrifying phosphorus uptake.
Method the most according to claim 1, it is characterised in that Fe2+The position that adds of salt is detesting of denitrifying phosphorus removal technique
Oxygen stage or anoxic phases.
Method the most according to claim 1, it is characterised in that Fe2+The dosage of salt is Fe2+The dosage of salt increases with dephosphorization
The mol ratio of dosage is 0.2～1:1.
Method the most according to claim 4, it is characterised in that the mol ratio more optimized is 0.3～0.5:1.
Method the most according to claim 1, it is characterised in that Fe2+The dosing method of salt adds for interval, persistently adds 10
～after 30 days, stop adding, when Process for Effluent dephosphorization efficiency reduces, recover to add, circulate successively.
Method the most according to claim 1, it is characterised in that described denitrifying phosphorus removal technique refers to denitrifying phosphorus removing bacteria
The technique realizing synchronous denitrification dephosphorizing for functional microorganism.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114702136A (en) * | 2022-04-19 | 2022-07-05 | 青岛思普润水处理股份有限公司 | AOA coupling efficient autotrophic nitrogen removal water treatment method and system |
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Effective date of registration: 20220818 Address after: A1206, Happiness City Commercial Building, Heping East Road, Tsinghua Community, Longhua Street, Longhua District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Wanmu Water Co.,Ltd. Address before: Room 807, University Pioneer Park, Lishan Road, Taoyuan Street, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SHENZHEN RUIQING ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |