CN106587350B - Sewage disposal system and processing method based on magnetic-coagulation AAS and magnetization MABR - Google Patents
Sewage disposal system and processing method based on magnetic-coagulation AAS and magnetization MABR Download PDFInfo
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- CN106587350B CN106587350B CN201611183981.3A CN201611183981A CN106587350B CN 106587350 B CN106587350 B CN 106587350B CN 201611183981 A CN201611183981 A CN 201611183981A CN 106587350 B CN106587350 B CN 106587350B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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Abstract
The present invention provides a kind of based on magnetic-coagulation AAS and magnetizes the sewage disposal system and processing method of MABR, the sewage disposal system it include magnetic-coagulation and hypoxia activity sludge treating block, anoxic sludge Magneto separate unit, magnetization nitrifying sludge and film separation unit, aerobic sludge Magneto separate unit；Sewage enters magnetic-coagulation and hypoxia activity sludge treating block, investment magnetic powder, chemical coagulator are handled, then it is separated by anoxic sludge Magneto separate unit, isolated sewage enters magnetization nitrifying sludge and membrane separation unit, and it puts into magnetic powder and is handled, it is separated using aerobic sludge Magneto separate unit, nitrification liquid flows back into magnetic-coagulation and hypoxia activity sludge treating block.Technical solution of the present invention is realized to advanced nitrogen dephosphorization synchronous in sewage, it is ensured that biological carbon and nitrogen removal, and fouling membrane is effectively relieved, there is better denitrification effect, phosphor-removing effect and nitrification effect and shorter muddy water mixed solution disengaging time.
Description
Technical field
The invention belongs at water-treatment technology field more particularly to a kind of sewage based on magnetic-coagulation AAS and magnetization MABR
Reason system and processing method.
Background technique
Currently, " centralization " sewage disposal system is in dominant position in the world, but in the influence of sustainable development ideological trend
Under, introspecting this end-o f-pipe -control of centralized sewage treatment existing deficiency in terms of resource and the energy in recycling sewage, after
And the interest of research and development and application is turned into separated practices, especially source and is controlled.International water quality association (IAWQ) even more exists
It is proposed in " small-scale sewage treatment facility " academic discussion: population equivalent is below 2000 or flow is 200m3/ d dirt below
Water station is small-scale sewage station.Numerous researchs point out, miniaturization Sewage Disposal construction be it is a kind of at centralized parallel sewage
Reason mode is effective supplement of centralized sewage treatment, has biggish advantage in terms of resource and energy recovery.
For the rapid emergence due to " distributing " large-scale population aggravation ground, caused sanitary sewage pipe network construction lag,
Waste water collection rate is low, a series of processing new problems such as reuse ratio is low again, Developed Countries decentralized type sewage tupe
Management and technical experience, expansion decentralized type sewage handle research of technique of new generation, research and develop that a kind of occupied area is small, automatic control degree
Decentralized type sewage treatment process high, contaminant removal efficiency is high, discharge standard is controllable is both the needs of national science and technology development,
It is also the Science & Technology Demands of Urban Water Environment comprehensive improvement.
Currently, artificial swamp and membrane bioreactor are the most common decentralized type sewage treatment process.Artificial swamp land occupation
Area is big, and fluctuation of service, is unsuitable for promoting in the city of land used anxiety.Membrane bioreactor then has occupied area small,
Convenient for assembling, the advantages such as biomass is big, are the optimal selections of city decentralized type sewage treatment process, but there is also following problems:
1) synchronous advanced nitrogen phosphor-removing effect；2) film blocks；3) the problems such as excess sludge is handled, is all the technology bottle that membrane process faces
Neck.
Biofilm is a kind of improved process of conventional activated sludge process, and at present at the most common decentralized type sewage
Science and engineering skill, it makes biomembrane process have the advantage that the 1) effectively catching by UF membrane to activated sludge by this, substantially
The detention period and biomass concentration for improving microorganism improve the biological removal ability of organic matter and nitrogen pollutant；2) sharp
With the lesser aperture of diaphragm, muddy water mixed solution can be separated by solid-liquid separation, save subsequent secondary settling tank, shortened process flow.
But there are still following problems for membrane process: 1) for membrane process since sludge discharging period is long, biological phosphate-eliminating low efficiency causes technique to be difficult to synchronize
Advanced nitrogen dephosphorization；2) the chemical cooperated dephosphorization in membrane process will bring two aspect problems, first is that chemical agent is to nitrifying sludge
Active inhibition, second is that film blockage problem caused by chemical sludge；3) membrane pollution problem, cause the cycle of operation shorten, run at
This increase.Above-mentioned several big problems limit the application range of membrane bioreactor.
Summary of the invention
Against the above technical problems, the invention discloses a kind of based on magnetic-coagulation AAS and magnetizes the sewage treatment system of MABR
System and processing method are realized to advanced nitrogen dephosphorization synchronous in sewage, and fouling membrane are effectively relieved；It can be used for distributed sewage
Processing.
In this regard, the technical solution of the present invention is as follows:
A kind of magnetic-coagulation AAS (Anoxic Activated Sludge, hypoxia activity sludge) and magnetization MABR
The sewage disposal system of (Membrane Aeration Bio-Reactor, membrane aerated bioreactor) comprising magnetic-coagulation and
Hypoxia activity sludge treating block, anoxic sludge Magneto separate unit, magnetization nitrifying sludge and film separation unit, aerobic sludge magnetic point
From unit；Wherein, the magnetization nitrifying sludge and film separation unit are magnetization membrane bioreactor unit, and wherein UF membrane is logical
With term, that is, it is often referred to the film used in membrane bioreactor, i.e. MBR；The magnetic-coagulation and hypoxia activity sludge treating block
Including hypoxia activity sludge treatment pond, the hypoxia activity sludge treatment pond is equipped with magnetic powder addition entrance, chemical coagulator addition
Entrance and processing mixture export, the processing mixture export are connect with the entrance of anoxic sludge Magneto separate unit；
The anoxic sludge Magneto separate unit includes outlet of sewer, magnetization sludge outlet and excess sludge outlet, magnetic-coagulation
Enter in anoxic sludge Magneto separate unit with the mixed liquor of hypoxia activity sludge treating block processing and is separated by solid-liquid separation, the dirt
Water out is connect with the entrance of magnetization nitrifying sludge and membrane separation unit, the magnetization sludge outlet and hypoxia activity sludge
Processing pond connection；
The magnetization nitrifying sludge and membrane separation unit are equipped with magnetic powder addition entrance, muddy water mixed solution exports and normal
Discharge water outlet, the muddy water mixed solution outlet are connect with the entrance of aerobic sludge Magneto separate unit；Preferably, the material of the film
Matter is Kynoar PVDF；
The aerobic sludge Magneto separate unit includes that nitrification liquid outlet, magnetic powder and nitrifying sludge export, and the nitrification liquid goes out
Mouth is connect with magnetic-coagulation and hypoxia activity sludge treating block, the nitrifying sludge outlet and the magnetization nitrifying sludge and film point
Entrance connection from processing unit.
Wherein, the magnetization nitrifying sludge and membrane separation unit include aerobic membrane bioreactor.
As a further improvement of the present invention, the anoxic sludge Magneto separate unit includes the first magnetic separator and the first magnetic
Mud mixing arrangement, the aerobic sludge Magneto separate unit include the second magnetic separator and the second magnetic mud mixing arrangement, and the magnetic is mixed
Solidifying and hypoxia activity sludge treating block is connect with the first separator, first magnetic separator and the magnetization nitrifying sludge and
Membrane separation unit and the connection of the first magnetic mud mixing arrangement, the first magnetic mud mixing arrangement and magnetic-coagulation and hypoxia activity are dirty
The connection of mud processing unit；The magnetization nitrifying sludge and membrane separation unit are connect with the second magnetic separator, second magnetic
Separator is connect with the second magnetic mud mixing arrangement, magnetic-coagulation and hypoxia activity sludge treating block respectively, and second magnetic mud is mixed
It attaches together to set and be connect with magnetization nitrifying sludge and membrane separation unit.
As a further improvement of the present invention, the chemical coagulator is ferrous salt.
As a further improvement of the present invention, the chemical coagulator is FeSO4、Fe2(SO4)3、FeCl2、FeCl3、
AlCl3、Al2(SO4)3At least one of.
As a further improvement of the present invention, the additive amount of the chemical coagulator is 60-100mg/L.Preferably, described
The additive amount of chemical coagulator is 100mg/L.
By adopting the above technical scheme, the magnetic-coagulation and hypoxia activity sludge treating block are anti-with anoxic magnetic-coagulation biology
The principle for answering device is core, and magnetic powder and coagulant are added in hypoxia activity sludge-tank, is realized chemical coagulation pond and anoxic is living
Property sludge-tank be integrated, it is synchronous to realize high-efficient denitrification and dephosphorization, and save land occupation.
The invention also discloses the sewage water treatment methods of a kind of magnetic-coagulation AAS and magnetization MABR, use as described above
The sewage disposal system of magnetic-coagulation AAS and magnetization MABR carry out sewage treatment, comprising the following steps:
Step S1: sewage enters in the hypoxia activity sludge-tank of magnetic-coagulation and hypoxia activity sludge treating block, in anoxic
Under environment, chemical coagulator is added thereto, is made chemical coagulator in conjunction with hypoxia activity sludge, and synchronize and add magnetic powder, is obtained
To containing magnetic, mud, water mixed liquor；
Step S2: the magnetic, mud, water mixed liquid enter anoxic sludge Magneto separate unit, carry out solid-liquid point through magnetic separator
From isolated sewage subsequently enters magnetization nitrifying sludge and film separation unit；
Step S3: isolated sewage enters magnetization nitrifying sludge and film separation unit adds thereto under aerobic environment
Magnetic powder, sewage are direct emission water and muddy water mixed solution through UF membrane；
Step S4: it is that nitrification liquid and magnetization are dirty that the muddy water mixed solution, which enters aerobic sludge Magneto separate unit to carry out Magneto separate,
Mud, the nitrification liquid is back to magnetic-coagulation and hypoxia activity sludge treating block, then carries out denitrification；Magnetization sludge after separation
Then it is back to magnetization nitrifying sludge and film separation unit.
As a further improvement of the present invention, in step S2, the solid being separated by solid-liquid separation through magnetic separator is magnetic
Change sludge, a part for magnetizing sludge is introduced into magnetic-coagulation and hypoxia activity sludge treating block, the benefit as activated sludge
It fills.
As a further improvement of the present invention, the additive amount of magnetic powder is 0.3-1.0g/L in the step S1；The step
In S3, the input amount of magnetic powder is 4-10mg/L.
As a further improvement of the present invention, the additive amount of magnetic powder is 0.3-0.5g/L in the step S1；The step
In S3, the input amount of magnetic powder is 4-6mg/L.
As a further improvement of the present invention, the partial size of the magnetic powder is 50-75um.
As a further improvement of the present invention, the chemical coagulator is FeSO4、Fe2(SO4)3、FeCl2、FeCl3、
AlCl3、Al2(SO4)3At least one of.
As a further improvement of the present invention, the chemical coagulator is FeSO4.Preferably go out coagulant by a large number of experiments
FeSO4, the coagulant not only to microbial activity unrestraint, and can preferably using the cation in coagulant as electronics supply
Body strengthens the denitrification effect of hypoxia activity sludge.
As a further improvement of the present invention, the additive amount of the chemical coagulator is 60-100mg/L.Preferably, described
The additive amount of chemical coagulator is 100mg/L.
Technical solution of the present invention, each unit are played the role of as follows:
One, the technique leading portion is using anoxic magnetic-coagulation bioreactor as based on the A unit of core, in hypoxia activity sludge-tank
In add magnetic powder and coagulant, chemical coagulation pond and hypoxia activity sludge-tank are integrated by realization, synchronous realization efficient denitrification
Dephosphorization, and save land occupation.
(1) strengthened denitrification effect.
In magnetic-coagulation and hypoxia activity sludge treating block, hypoxia activity sludge utilizes the carbon source (organic matter) in sewage
It is nitrogen by nitrate transformation, realizes the removal of dirty Organic substance in water and nitrate, shown in chemical formula such as formula (1):
NO3 —+CH3OH——N2+CO2+H2O+OH—Formula (1)
The magnetic powder and chemical coagulator added, preferably ferrous salt are synchronized, strengthens hypoxia activity for synchronous through following manner
Sludge denitrification removes carbon process:
1. strengthened denitrification principle.
After adding magnetic powder, the magnetic field that magnetic powder generates can change bacterial cell ultra microstructure in activated sludge, in magnetic field
Mitochondria number of the bacterial cell in it obviously increase, and Intramitochondrial ridge also increases, therefore can be the breathing of cell
Redox provides enough places, and the variation of these ultra microstructures promotes the energetic supersession metabolism and substance fortune of cell
It is defeated, be conducive to cell division growth and development, to improve sludge activity and sludge quantity；
2. the chemical coagulator added, such as the Fe in ferrous salt2+It can be used as the electron donor other than carbon source, enhancement microbiological
Denitrification denitrogenation, improve nitrate removal efficiency, shown in chemical formula such as formula (2):
10Fe2++2NO3 -+6H2O→4Fe(OH)3+N2+6Fe3+Formula (2)
(2) strengthened denitrification effect.
Pre-stage test the result shows that, it is mixed that magnetic powder and ferrous sulfate are added in magnetic-coagulation and hypoxia activity sludge treating block
After solidifying agent, under the conditions of magnetic-coagulation, hypoxia activity sludge concentration and activity are significantly improved, and significantly improve nitrate removal rate, magnetic
Coagulation significantly enhances hypoxia activity sludge denitrification effect.
(3) reinforced phosphor-removing effect.
In magnetic-coagulation and hypoxia activity sludge treating block, pass through the phosphoric acid in dosing coagulant such as ferrous salt and sewage
Soluble phosphate is converted into slightly solubility ferrous phosphate shown in reaction equation such as formula (3) by the reaction that salt occurs.
Due to ferrous phosphate Fe3(PO4)2Indissoluble grain diameter is very tiny, and 70% partial size is less than 0.45um, it is difficult to heavy
It forms sediment and separates, removal rate is within 5%；And under the effect of hypoxia activity sludge, pass through the flocculation of microorganism, indissoluble particle
Diameter averagely can increase to 214um, may make total tp removal rate to improve to 92%, significantly improve independent chemical coagulation dephosphorization effect
Fruit.
(4) shorten the effect of mud-water separation time.
Traditional hypoxia activity sludge is since density is low, and extracellular polymeric viscosity coefficient is high and sludge specific resistance is larger, completely
Separation takes around 70-90min；But under the synergistic effect of chemical coagulator and magnetic powder, by being enriched with magnetic powder using microorganism,
The magnetism for strengthening zoogloea substantially shortens the separation of solid and liquid time of ferrous phosphate precipitating by magnetic fields, can be by original
90min foreshortens to 10min.
(5) cost is reduced.
The technique middle section uses the separating technology of magnetic separator, divides respectively hypoxia activity sludge and aerobic sludge
From.Pass through the mud-water separation of magnetic separator: 1) avoiding nitrifying sludge from mixing with anoxic sludge, guarantees nitrifying sludge activity and sludge
Amount；2) magnetic powder is recycled, magnetic powder recovery utilization rate is improved, controls operating cost.
Two, the technique last part technology has preferable nitrification efficiency, but membrane pollution problem using magnetization MABR, MABR itself
It is the technical bottleneck of the core cell, technical solution of the present invention is by the way of coupling magnetic powder, with following efficiency:
(1) magnetization aerobic activated sludge microbe species are richer, strengthen nitrification effect.
After this unit adds magnetic powder, activated sludge easily forms magnetic-particle sludge, and activated sludge is made to be not easy sludge bulking,
And reinforce enzymatic activity using magnetic powder, nitrifier activity is improved, and using magnetic powder as carrier, increase nitrification bacteria biomass, finally
Strengthen nitrification efficiency.Under conditions of influent ammonia nitrogen mean concentration is 40mg/L, not plus before magnetic powder, the water outlet ammonia nitrogen of MABR is flat
Equal concentration is 4.7mg/L, and removal rate reaches 88.25%；After adding magnetic powder, water outlet ammonia nitrogen mean concentration is 2.3mg/L, removal rate
Reach 94.25%.
(2) magnetization MABR fouling membrane is alleviated.
After adding magnetic powder, increase aerobic activated sludge partial size, granularity is bigger, and Specific Cake (SRF) is smaller,
Flux depression is slower.In addition, magnetic powder declines extracellular polymeric (EPS), viscosity of mixed liquid coefficient is reduced, is reduced under membrane flux
Reduction of speed degree.In small-scale experiment, 4-6mg/L Fe is added3O4Before and after (partial size 50-75um), 30min, 60min are run in device
When with 90min, membrane flux ratio (the real-time flux of film/film clear water flux) is respectively 94% and 85%；82% and 74%；67% He
59%.In pilot process operational process, MABR unit adds 4-6mg/L Fe3O4Before and after (partial size 50-75um), diaphragm
Cleaning frequency extends to 3d by 1d.
The A/A/O-MBR (A2O-MBR, anaerobic/anoxic/aerobic activated sludge-membrane biological reactor process) of the prior art
Technique is primarily present that biological phosphor-removing effect is unstable and fouling membrane two large problems, compared with existing A/A/O-MBR technique, this hair
It is bright to be solved using following scheme:
First, anaerobic unit is abandoned, biochemistry collaboration dephosphorization is substituted into biological phosphate-eliminating；It cooperates with and removes with the current most common biochemistry
Chemical agent and aerobic activated sludge are coupled difference by phosphorus, are made to reduce chemical coagulator to the full extent to the inhibition of nitrifier
With this technique couples chemical coagulator with preposition hypoxia activity sludge-tank；Coagulant not only to microbial activity unrestraint, and
Using the cation in coagulant as electron donor, strengthen the denitrification effect of hypoxia activity sludge；Using ferrous salt
Chemical coagulator is strengthened and is lacked as electron donor using the cation in coagulant not only to microbial activity unrestraint
The denitrification effect of oxygen activity sludge.
Second, to strengthen the mud-water separation efficiency of hypoxia activity sludge, and improve the mixed of the tiny indissoluble particle of ferrous phosphate
Solidifying effect synchronizes in hypoxia activity sludge-tank and adds magnetic powder, test result discovery, magnetic powder, coagulant and hypoxia activity sludge
There is fabulous coupling effect, not only increase hypoxia activity sludge activity, also improve sludge flocculation effect, accelerates subsequent muddy water
Separation.
Third, for membrane pollution problem, technical solution of the present invention merges aerobic activated sludge unit with MBR, is formed
MABR, and add magnetic powder wherein, reduce the extracellular polymeric of aerobic activated sludge and improve sludge partial size, alleviate fouling membrane；
Hypoxia activity sludge is separated with aerobic activated sludge by magnetic separator, first is that avoiding the chemical agent in hypoxia activity sludge
Diaphragm is polluted；Second is that sludge concentration in control aerobic activated sludge pond, dirty since nitrifier generation growth cycle is longer
Mud amount is smaller, and aerobic section and anaerobism section are separated, and sludge concentration can be effectively controlled, and alleviates fouling membrane.
4th, hypoxia activity sludge is carried out mud-water separation, only allows filtered supernatant by technical solution of the present invention
Into subsequent MABR film unit, hypoxia activity sludge is avoided to mix with aerobic activated sludge, is conducive in subsequent aerobic section culture
The higher nitrifier of strain homozygosity out, to guarantee the activity and quantity of nitrifier.Magnetic powder can be used as carrier and motivating factor, mention
The concentration and activity of microorganism in high anoxic and aerobic activated sludge unit, to ensure denitrification and nitrification effect.
Compared with prior art, the invention has the benefit that
Technical solution of the present invention is utilized using magnetic-coagulation AAS+ magnetization MABR as core, is realized de- to depth synchronous in sewage
Nitrogen dephosphorization, it is ensured that biological carbon and nitrogen removal, and fouling membrane is effectively relieved, it is complete under the premise of guaranteeing microbial activity in conjunction with magnetic-coagulation
At biochemical dephosphorization process；Provide a kind of decentralized type sewage treatment process of high-efficiency compact.With traditional A/A/O membrane process phase
Than with better denitrification effect, phosphor-removing effect and nitrification effect and shorter muddy water mixed solution disengaging time.It should
New solution finally realize needed for decentralized type sewage treatment process it is efficient, compact, be easily assembled, the functions such as the degree of automation height it is special
Point.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of the sewage disposal system based on magnetic-coagulation AAS and magnetization MABR of the present invention.
Specific embodiment
Technical solution of the present invention is described in further detail below with reference to example.
As shown in Figure 1, it is a kind of based on magnetic-coagulation AAS and magnetization MABR sewage disposal system comprising magnetic-coagulation and lack
Oxygen activity sludge treating block, anoxic sludge Magneto separate unit, magnetization nitrifying sludge and film separation unit, aerobic sludge Magneto separate
Unit；
The magnetic-coagulation and hypoxia activity sludge treating block include hypoxia activity sludge treatment pond, and the hypoxia activity is dirty
Mud processing pond is equipped with magnetic powder addition entrance, chemical coagulator addition entrance and processing mixture export, the processing mixed liquor and goes out
Mouth is connect with the entrance of anoxic sludge Magneto separate unit；Sewage enters this unit, is substantially carried out denitrification denitrogenation and chemical dephosphorization.
Under anaerobic environment, magnetic powder and chemical coagulator are added into hypoxia activity sludge-tank, by chemical coagulation and hypoxia activity sludge
In conjunction with, and synchronize and add magnetic powder, realize synchronous denitrification denitrogenation and chemical dephosphorization.This unit has the characteristics that following: 1. reducing
Preposition chemical coagulation pretreatment unit；2. the consumption in advance of carbon source needed for avoiding microorganism denitrification guarantees denitrification efficiency；③
By the flocculation of microorganism and mangneto (magnetic core) effect of magnetic powder, strengthen chemical coagulation effect, improves phosphate removal effect
Rate；4. improving sludge quantity and sludge activity to the stimulation of microbial enzyme by magnetic powder, microorganism denitrification denitrogenation effect is improved
Rate.
The anoxic sludge Magneto separate unit includes the first magnetic separator and the first magnetic mud mixing arrangement, first magnetic point
It include outlet of sewer and separation magnetization sludge outlet from device, the outlet of sewer and magnetization nitrifying sludge and film separation unit connect
It connects, the separation magnetization sludge outlet is connect with the first magnetic mud mixing arrangement, and the first magnetic mud mixing arrangement includes reflux magnetic
Change sludge outlet and excess sludge outlet, the reflux magnetization sludge outlet is connect with hypoxia activity sludge treatment pond.Magnetic-coagulation
Enter in anoxic sludge Magneto separate unit with the mixed liquor of hypoxia activity sludge treating block processing and is separated by solid-liquid separation, separation
Sewage enters magnetization nitrifying sludge and film separation unit, and isolated magnetization sludge enters the first magnetic mud mixing arrangement, wherein one
Magnetization sludge reflux is divided to enter hypoxia activity sludge treatment pond, others are discharged as excess sludge.The separation in this stage is intended to
Muddy water mixed solution containing magnetic, medicament is separated, only denitrification liquid is allowed to enter magnetization nitrifying sludge and film separation unit,
And hypoxia activity sludge reflux will be magnetized, avoid it from mixing with the nitrifying sludge in magnetization nitrifying sludge and film separation unit, this
The effect of unit is as follows: 1. nitrifier is more sensitive, poor to chemical agent tolerance, can avoid magnetic-coagulation after separation and lacks
The chemical coagulator that oxygen activity sludge treating block is added causes to inhibit to nitrifying sludge activity；2. hypoxia activity sludge and aerobic
Activated sludge separates, and can make purifying agaric, each self-sustaining greater activity.
The magnetization nitrifying sludge and membrane separation unit magnetize MABR unit, are equipped with magnetic powder and add entrance, mud
Water mixed liquid outlet and normal discharge water out, the muddy water mixed solution outlet and the entrance of aerobic sludge Magneto separate unit connect
It connects.For mixture after the separation of anoxic sludge Magneto separate unit, sewage enters magnetization nitrifying sludge and membrane separation unit i.e. well
Oxygen de-nitrification unit.This unit is under aerobic environment, by nitrifying activated sludge in conjunction with UF membrane, and adds magnetic powder thereto, lacks
Sewage in oxygen sludge Magneto separate unit is through UF membrane, direct emission.This unit has the advantage that the 1. retention by diaphragm
Effect, keeps the longer nitrifier quantity of generation growth cycle larger；2. the loading of magnetic powder can stimulate aerobic activated sludge enzyme activity
Property, nitrifying sludge biomass and rate of nitrification are improved, nitrification efficiency is improved；3. magnetic powder can be relieved fouling membrane, extend membrane bioreaction
Answer the device cycle of operation.After magnetizing MABR, carbon, nitrogen and phosphorus are disposed in sanitary sewage.
The aerobic sludge Magneto separate unit includes the second magnetic separator and the second magnetic mud mixing arrangement, second magnetic point
It include nitrification liquid outlet and separated sludge outlet from device, the nitrification liquid outlet is connect with hypoxia activity sludge treatment pond, described
Separated sludge outlet is connect with the second magnetic mud mixing arrangement, the second magnetic mud mixing arrangement include nitrifying sludge bypass outlet with
Sludge outlet is discharged, the nitrifying sludge bypass outlet is connect with magnetization nitrifying sludge and membrane separation unit.Magnetization nitrification
Muddy water mixed solution in sludge and membrane separation unit enters this unit after magnetic separator separates, and it is mixed that nitrification liquid is back to magnetic
Solidifying and hypoxia activity sludge treating block magnetizes AAS unit, then carries out denitrification；Magnetic powder and nitrifying sludge after separation it is mixed
It closes object and is then back to magnetization nitrifying sludge and membrane separation unit again.This unit has the advantage that 1. magnetic powder is recyclable,
Magnetic powder utilization efficiency is improved, operating cost is reduced；2. nitrification liquid and nitrifying sludge separate, it is living that nitrifying sludge is not back to anoxic
Property sludge unit, maintains the high-purity of strain, is conducive to ensure efficient nitrification efficiency.
Decentralized sewage treatment method is carried out using above system, comprising the following steps:
Step S1: sewage enters in the hypoxia activity sludge-tank of magnetic-coagulation and hypoxia activity sludge treating block, in anoxic
Under environment, chemical coagulator FeSO is added thereto4, make chemical coagulator in conjunction with hypoxia activity sludge, and synchronize and add magnetic
Powder, obtain containing magnetic, mud, water mixed liquor；Wherein, the additive amount of the magnetic powder is 0.3-0.5g/L, the partial size of the magnetic powder
For 50-75um；The additive amount of the chemical coagulator is 100mg/L.Add the magnetic powder (Fe of 50-75um3O4) 0.3-0.5g/L,
Magnetic field can change bacterial cell ultra microstructure in activated sludge, and mitochondria number of the bacterial cell in magnetic field in it is obvious
Increase, and Intramitochondrial ridge also increases, therefore can provide enough places for the breathing redox of cell, these ultra micros
The variation of structure promotes the energetic supersession metabolism and matter transportation of cell, is conducive to cell division growth and development, thus
Improve sludge activity and sludge quantity.100mg/L chemical coagulator (the FeSO added4) in Fe2+It can be used as the electronics other than carbon source
Donor, the denitrification denitrogenation of enhancement microbiological improve nitrate removal efficiency.
Pre-stage test the result shows that, in the 300mg/L magnetic powder (Fe for adding 50um3O4) and 100mg/L ferrous sulfate
(FeSO4) under conditions of coagulant, the sludge concentration (MLVSS) point of magnetic-coagulation hypoxia activity sludge and pure hypoxia activity sludge
It Wei not 2026 and 1280mg/L；Denitrification rate is respectively 38.24 and 23.17mg/gVSSh；Nitrate removal rate is respectively
70.6 with 89.7%.From the above results, under the conditions of magnetic-coagulation, hypoxia activity sludge concentration and activity are significantly improved, and make nitre
Hydrochlorate removal rate significantly improves, and magnetic-coagulation significantly enhances hypoxia activity sludge denitrification effect.
About reinforced phosphor-removing effect, by adding 100mg/L coagulant (FeSO4) reacted with what phosphate occurred, molten
Solution acid phosphate is converted into slightly solubility ferrous phosphate；Since ferrous sulfate indissoluble grain diameter is very tiny, 70% partial size is small
In 0.45um, it is difficult to which precipitation and separation, removal rate is within 5%；Under hypoxia activity sludge (MLVSS 2026mg/L) effect,
By the flocculation of microorganism, indissoluble grain diameter can averagely increase to 214um, may make total tp removal rate improve to
92%, mean concentration is reduced by the 4.8mg/L intake as 0.37mg/L, significantly improves independent chemical coagulation phosphor-removing effect.
About the effect for shortening the mud-water separation time, for traditional hypoxia activity sludge since density is low, extracellular polymeric is viscous
It spends coefficient height and sludge specific resistance is larger, be kept completely separate and take around 70-90min；But in coagulant (FeSO4) and magnetic powder
(the 50um Fe of 300mg/L3O4) synergistic effect under, by using microorganism be enriched with magnetic powder, strengthen the magnetism of zoogloea, pass through
Magnetic fields substantially shorten the separation of solid and liquid time of ferrous phosphate precipitating, can foreshorten to 10min by original 90min.
Step S2: the magnetic, mud, water mixed liquid enter anoxic sludge Magneto separate unit, carry out solid-liquid point through magnetic separator
From isolated sewage subsequently enters magnetization nitrifying sludge and film separation unit；Consolidate through what magnetic separator was separated by solid-liquid separation
Body is magnetization sludge, and a part for magnetizing sludge is introduced into magnetic-coagulation and hypoxia activity sludge treating block, as active dirty
The supplement of mud.
Step S3: isolated sewage enters magnetization nitrifying sludge and film separation unit, throws under aerobic environment, and thereto
Add magnetic powder, sewage is direct emission water and muddy water mixed solution through UF membrane；4-6mg/L Fe is added in this unit3O4(partial size
For 50-75um), after adding magnetic powder, activated sludge easily forms magnetic-particle sludge, and activated sludge is made to be not easy sludge bulking, and benefit
Reinforce enzymatic activity with magnetic powder, improve nitrifier activity, and using magnetic powder as carrier, increases nitrification bacteria biomass, it is final to strengthen
Nitrification efficiency.Under conditions of influent ammonia nitrogen mean concentration is 40mg/L, not plus before magnetic powder, the water outlet ammonia nitrogen of MABR is average dense
Degree is 4.7mg/L, and removal rate reaches 88.25%；After adding magnetic powder, water outlet ammonia nitrogen mean concentration is 2.3mg/L, and removal rate reaches
94.25%.
In small-scale experiment, 4-6mg/L Fe is added3O4Before and after (partial size 50-75um), device run 30min,
When 60min and 90min, membrane flux ratio (the real-time flux of film/film clear water flux) is respectively 94% and 85%；82% and 74%；
67% and 59%.In pilot process operational process, MABR unit adds 4-6mg/L Fe3O4Before and after (partial size 50-75um),
The cleaning frequency of diaphragm extends to 3d by 1d.
Step S4: it is that nitrification liquid and magnetization are dirty that the muddy water mixed solution, which enters aerobic sludge Magneto separate unit to carry out Magneto separate,
Mud, the nitrification liquid is back to magnetic-coagulation and hypoxia activity sludge treating block, then carries out denitrification；Magnetization sludge after separation
Then it is back to magnetization nitrifying sludge and film separation unit.
As shown in Figure 1, in view of the characteristics of demand of decentralized type sewage treatment facility: efficient, compact, controllable degree is high, this hair
It is bright to realize efficient decarburization by the coupling of three for three big cores with magnetic, film and activated sludge, denitrogenate, dephosphorization；It improves
Mud-water separation efficiency reduces structures occupied area, realizes process intensification structure；Alleviate fouling membrane, extend the cycle of operation, realizes
Technique long-term effect.It is illustrated individually below:
(1) high efficiency.
1) strengthened denitrification efficiency.In A unit, hypoxia activity sludge utilizes the carbon source (organic matter) in sewage by nitrate
It is converted into nitrogen, realizes the removal of dirty Organic substance in water and nitrate.Synchronize the magnetic powder added and chemical coagulator (ferrous salt)
Synchronous hypoxia activity sludge denitrification of strengthening is removed carbon process through following manner: 1. magnetic powder passes through magnetic effect, Stimulated by Hypoxia activity
Sludge enzymatic activity improves sludge activity and sludge quantity；2. the chemical coagulator (ferrous salt) added can be used as electron donor, ginseng
With the denitrification denitrogenation of microorganism, nitrate removal efficiency is improved.
2) reinforced phosphor-removing efficiency.In A unit, reacted by coagulant with what phosphate occurred, it is complete as shown in formula (3)
The removal of pairs of phosphate from sewage.In addition, it is mixed to strengthen chemistry by biological flocculation for the hypoxia activity sludge in this unit
Solidifying process；Magnetic powder strengthens biochemical coagulation process by magnetic effect；Final cooperative reinforcing phosphate removal.
3) strengthen nitrification efficiency.In C cell, aerobic sludge (aerobic bacteria+nitrifier) utilizes oxygen by microbial action
Mineralized nitrogen in sewage is nitrate by gas, and is synchronized and converted carbon dioxide and water for remaining organic matter, realizes sewage
The removal of middle organic matter and ammonia nitrogen.Aerobic membrane bioreactor (MABR) of the present invention in magnetization nitrifying sludge and film separation unit
In add magnetic powder, enzymatic activity is excited by magnetic powder, improves nitrifying sludge biomass and bioactivity, meanwhile, magnetic powder itself can be made
For nitrifying sludge carrier, microbial biomass in C cell is improved, it is especially more significant to the nitrifier effect of generation growth cycle.It is logical
Above-mentioned two effects are crossed, the removal efficiency of organic matter and ammonia nitrogen in MABR is improved.
(2) compactedness.Compactedness major embodiment of the invention is both ways:
1) UF membrane substitutes secondary settling tank, reduces technique land occupation, shortens process treatment time.Mud is carried out using film in C cell
Water separation, substitutes the secondary settling tank in traditional activated sewage treatment structure, improves separative efficiency, reduces structures occupied area,
Shorten process flow.
2) Magneto separate substitutes traditional sedimentation basin, substantially shortens disengaging time, reduces technique land occupation.In A unit hypoxia activity
Magnetic powder is added in sludge-tank and C cell aerobic activated sludge pond, by stirring action and magnetic effect, is generated using magnetic powder as core
Sludge wadding body, be rapidly separated with back magnetization mud mixed liquid through the magnetic fields of unit B and D unit magnetic separator, will
Disengaging time (30min-60min) needed for conventional vertical-flow or inclined-plate clarifying basin foreshortens to rapidly 5-8min, reduces separation structure
Object occupied area is built, process flow is shortened.
(3) long-term effect.The magnetic and film being related in the present invention limit related process due to expendable and lossy
The cycle of operation causes operating cost higher.The present invention passes through the coupling of magnetic, film and activated sludge, effectively extends technique fortune
The row period, major embodiment both ways:
1) magnetic powder recycles.Thrown magnetic powder carries out reuse by magnetic separator, and the rate of recovery is up to 90-95%, greatly improves magnetic
Powder service life reduces magnetic powder and adds cost；
2) the multiple utilization of coagulant.Used chemical coagulator is ferrous sulfate, and the price of ferrous sulfate is only common
/ 10th of trivalent iron salt and aluminium salt price, and ferrous salt can be used as chemical coagulator dephosphorization, at the same time as electronics
Donor participates in microorganism denitrification denitrogenation.The multi-efficiency and low price of selected coagulant, be provided with coagulant makes for a long time
Feasibility.
3) fouling membrane is alleviated, and the cycle of operation extends.The maximum technical bottleneck of embrane method is fouling membrane, and this problem limits films
Service life.The present invention synchronizes using MABR as embrane method core and adds magnetic powder.Change the parting dimension of activated sludge by magnetic powder
The physical and chemical performances such as number, partial size and viscosity coefficient, the final membrane pollution problem alleviated in technique, extend the applicable period of diaphragm, make
Technique has long-term effect.
Certain town sewage demonstrative project, using the sewage disposal system of the invention based on magnetic-coagulation AAS and magnetization MABR
Sewage treatment is carried out, i.e., MABR, the magnetic kind added in leading portion hypoxia activity sludge system (AAS) are magnetized using magnetic-coagulation AAS+
For Fe3O4, partial size 50um, dosage 300mg/L；The coagulant added is FeSO4, dosage 100mg/L；It is carried out using magnetic drum
Mud-water separation.Back segment magnetizes MABR system, and the film used is hollow-fibre membrane；Magnetic kind is Fe3O4, partial size 50um, dosage 4-
6mg/L。
Using the sewage water treatment method, that is, magnetic-coagulation AAS+ magnetization MABR processing method and A/A/O+MBR work of the present embodiment
The pollutant removal of skill compares, and comparing result is as follows:
The method removal effect of the A/A/O+MBR of the sewage water treatment method and prior art of 1 the present embodiment of table compares
By the data of above-mentioned table 1 as it can be seen that using technical solution of the present invention, there is preferably synchronous advanced nitrogen dephosphorization effect
Fruit, and fouling membrane is effectively relieved, the time of film washing time extends.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
Specific implementation of the invention is only limited to these instructions.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to of the invention
Protection scope.
Claims (10)
1. the sewage disposal system of a kind of magnetic-coagulation AAS and magnetization MABR, it is characterised in that: it includes magnetic-coagulation and hypoxia activity
Sludge treating block, anoxic sludge Magneto separate unit, magnetization nitrifying sludge and film separation unit, aerobic sludge Magneto separate unit；
The magnetic-coagulation and hypoxia activity sludge treating block include hypoxia activity sludge treatment pond, at the hypoxia activity sludge
Manage pond be equipped with magnetic powder addition entrance, chemical coagulator addition entrance and processing mixture export, the processing mixture export and
The entrance of anoxic sludge Magneto separate unit connects；
The anoxic sludge Magneto separate unit includes outlet of sewer, magnetization sludge outlet and excess sludge outlet, the magnetic-coagulation
Enter in anoxic sludge Magneto separate unit with the mixed liquor of hypoxia activity sludge treating block processing and is separated by solid-liquid separation, the dirt
Water out is connect with the entrance of magnetization nitrifying sludge and membrane separation unit, the magnetization sludge outlet and hypoxia activity sludge
Processing pond connection；
The magnetization nitrifying sludge and membrane separation unit are equipped with magnetic powder addition entrance, muddy water mixed solution outlet and normal discharge
Water out, the muddy water mixed solution outlet are connect with the entrance of aerobic sludge Magneto separate unit；
The aerobic sludge Magneto separate unit includes that nitrification liquid outlet, magnetic powder and nitrifying sludge export, the nitrification liquid outlet with
Magnetic-coagulation is connected with hypoxia activity sludge treating block, at the nitrifying sludge outlet and the magnetization nitrifying sludge and UF membrane
Manage the entrance connection of unit.
2. the sewage disposal system of magnetic-coagulation AAS according to claim 1 and magnetization MABR, it is characterised in that: described to lack
Oxygen sludge Magneto separate unit includes the first magnetic separator and the first magnetic mud mixing arrangement, and the aerobic sludge Magneto separate unit includes
Second magnetic separator and the second magnetic mud mixing arrangement, the magnetic-coagulation and hypoxia activity sludge treating block and the first separator connect
It connects, first magnetic separator is connect with the magnetization nitrifying sludge and membrane separation unit, the first magnetic mud mixing arrangement, institute
The first magnetic mud mixing arrangement is stated to connect with magnetic-coagulation and hypoxia activity sludge treating block；The magnetization nitrifying sludge and UF membrane
Processing unit is connect with the second magnetic separator, second magnetic separator respectively with the second magnetic mud mixing arrangement, magnetic-coagulation and lack
The connection of oxygen activity sludge treating block, the second magnetic mud mixing arrangement and magnetization nitrifying sludge and membrane separation unit connect
It connects；The magnetization nitrifying sludge and membrane separation unit include aerobic membrane bioreactor.
3. the sewage water treatment method of a kind of magnetic-coagulation AAS and magnetization MABR, it is characterised in that: using as claimed in claim 1 or 2
Magnetic-coagulation AAS and magnetization MABR sewage disposal system carry out sewage treatment, comprising the following steps:
Step S1: sewage enters in the hypoxia activity sludge-tank of magnetic-coagulation and hypoxia activity sludge treating block, in anaerobic environment
Under, chemical coagulator is added thereto, is made chemical coagulator in conjunction with hypoxia activity sludge, and synchronize and add magnetic powder, is contained
There is the mixed liquor of magnetic, mud, water；
Step S2: the magnetic, mud, water mixed liquid enter anoxic sludge Magneto separate unit, are separated by solid-liquid separation through magnetic separator, point
From sewage subsequently enter magnetization nitrifying sludge and film separation unit；
Step S3: isolated sewage enters magnetization nitrifying sludge and film separation unit adds magnetic under aerobic environment thereto
Powder, sewage are direct emission water and muddy water mixed solution through UF membrane；
Step S4: the muddy water mixed solution, which enters aerobic sludge Magneto separate unit, to carry out Magneto separate as nitrification liquid and magnetizes sludge,
The nitrification liquid is back to magnetic-coagulation and hypoxia activity sludge treating block, then carries out denitrification；Magnetization sludge after separation is then
It is back to magnetization nitrifying sludge and film separation unit.
4. the sewage water treatment method of magnetic-coagulation AAS according to claim 3 and magnetization MABR, it is characterised in that: step S2
In, the solid that is separated by solid-liquid separation through magnetic separator is magnetization sludge, magnetize sludge a part be introduced into magnetic-coagulation and
Supplement in hypoxia activity sludge treating block, as activated sludge.
5. the sewage water treatment method of magnetic-coagulation AAS according to claim 3 and magnetization MABR, it is characterised in that: the step
The additive amount of magnetic powder is 0.3-1.0g/L in rapid S1；In the step S3, the input amount of magnetic powder is 4-10mg/L.
6. the sewage water treatment method of magnetic-coagulation AAS according to claim 5 and magnetization MABR, it is characterised in that: the step
The additive amount of magnetic powder is 0.3-0.5g/L in rapid S1；In the step S3, the input amount of magnetic powder is 4-6mg/L.
7. the sewage water treatment method of magnetic-coagulation AAS according to claim 5 and magnetization MABR, it is characterised in that: the magnetic
The partial size of powder is 50-75um.
8. the sewage water treatment method of magnetic-coagulation AAS according to claim 3 and magnetization MABR, it is characterised in that: describedization
Coagulant is at least one of ferrous salt, ferric sulfate, iron chloride, aluminum sulfate, aluminium chloride.
9. the sewage water treatment method of magnetic-coagulation AAS according to claim 8 and magnetization MABR, it is characterised in that: describedization
Coagulant is FeSO4。
10. the sewage water treatment method of magnetic-coagulation AAS according to claim 8 and magnetization MABR, it is characterised in that: describedization
The additive amount for learning coagulant is 60-100mg/L.
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