CN107285466A - The sewage-treatment plant and processing method of bubble-free aeration bioreactor synchronous nitration and denitrification - Google Patents
The sewage-treatment plant and processing method of bubble-free aeration bioreactor synchronous nitration and denitrification Download PDFInfo
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- CN107285466A CN107285466A CN201710556284.6A CN201710556284A CN107285466A CN 107285466 A CN107285466 A CN 107285466A CN 201710556284 A CN201710556284 A CN 201710556284A CN 107285466 A CN107285466 A CN 107285466A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/38—Gas flow rate
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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Abstract
The present invention provides the sewage-treatment plant of bubble-free aeration bioreactor synchronous nitration and denitrification, and the processing unit includes raw water water tank, intake pump, regulating valve, flowmeter, Membrane Aeration Biofilm Reactor, gas flowmeter I, pressure gauge air compressor machine, hydrophobic hollow fiber membrane module, circulating pump.The processing method of sewage-treatment plant using bubble-free aeration bioreactor synchronous nitration and denitrification is provided simultaneously.Beneficial effect is that this method makes technique nitrification and denitrification process carry out or sequentially be carried out in same reactor in two different reactors, while reducing energy consumption and material consumption.When it is 0.04MPa to be aerated pressure, obtain 74.67% TN clearances, when it is only 0.06MPa to be aerated pressure, COD clearances can reach 93%, and in C/N ratios close in the case of 6, nitrification efficiency reaches 99.24%, and denitrification efficiency is 83.75%, TN clearances reach 85.42%, and in addition COD clearances maintain more than 80% all the time.
Description
Technical field
The present invention relates to technical field of biological sewage treatment, more particularly to a kind of bubble-free aeration bioreactor synchronous nitration
Denitrifying sewage-treatment plant and processing method.
Background technology
Hydrophobic microporous membrane Membrane Aeration Biofilm Reactor is a type of membrane bioreactor, and the reactor is one
Plant by being oxygenated into hydrophobic micropore hollow-fibre membrane cavity, oxygen and pollutant are presented different in the biomembrane adhered to thereon
To mass transfer, by the metabolic consumption dissolved oxygen of microorganism in biomembrane, main body feed liquid and obtain the pollutant in sewage
A kind of sewage disposal technology of degraded.The process that hydrophobic microporous membrane Membrane Aeration Biofilm Reactor removes pollutant can be divided into
Four step below：First, the anaerobic bacteria reaction in the pollutant and current in water body so that a part of phosphate absorbed, nitrogenous
Organic matter degradation is ammonia nitrogen；Second, the pollutant after degraded is with current and biomembrane making contact, under concentration difference driving, to
Biological membrane interface diffusion, while oxygen is spread from hydrophobic microporous membrane intracavitary to outside；3rd, the aerobic bacteria or simultaneous in biomembrane
Pollutant is further degraded to nitrate NO by oxygen bacterium by metabolism3 -, nitrite NO2 -Deng；4th, after secondary degraded
Pollutant be again introduced into anaerobic zone with current, the nitrate, nitrite after conversion are reduced into N2, reach efficiencies of nitrogen removal.
Coexisting so that Denitrifying Phosphate Accumulating Organisms are enriched with for the reactor anoxic and anaerobic environment, makes reactor have while denitrogenation
Phosphorus removal functional.
Effumability and poisonous and harmful in sewage when hydrophobic microporous membrane bubble-free aeration avoids traditional biological processing aeration
Odorant (such as hydrocarbon and arene, sulfide, nitrogen-containing compound and oxygen-bearing organic matter) with bubble enter air and to ring
Border is polluted, while foam will not be produced due to the presence of surfactant.By micropore oxygen supply, oxygen transfer efficiency obtains pole
Big raising, can almost reach 100%, operating cost is also decreased.Meanwhile, gas-liquid two-phase using hydrophobic microporous membrane as point
Boundary, the control of aerating system can be with more flexible and convenient.Biological denitrificaion is to remove the relatively inexpensive of nitrate pollution from waste water to have
One of method of effect, generally comprises nitrifying process and denitrification process.Nitrifying process be by nitrifier by mineralized nitrogen be NO2 -With
NO3 -.Denitrification process is the NO under anaerobic or hypoxia condition2 -And NO3 -N is converted into by micro-reduction2, need in course of reaction
Organic carbon is wanted as carbon source and the energy.Traditional denitrification process and new denitrification process, the microorganism for being responsible for denitrogenation are mainly nitre
Change bacterium and denitrifying bacterium.In actual applications, it is usually by nitrifying process and denitrification because of the difference of two kinds of thalli growth environment
Process substep sequence is carried out, such as traditional A/O, A2/ O techniques, it is tediously long to there is technique, and sewage treatment structure floor space is big,
Many drawbacks such as investment and operating cost height.
The content of the invention
For deficiency of the prior art, it is an object of the invention to provide a kind of bubble-free aeration bioreactor synchronous nitration
Denitrifying sewage-treatment plant, realizes and utilizes hydrophobic microporous membrane Membrane Aeration Biofilm Reactor synchronous nitration and denitrification pair
The denitrogenation processing of sewage.The device enhanced biological nitrogen removal technology, improves the stability of a system；
To achieve the above object, the technical solution adopted by the present invention is to provide bubble-free aeration bioreactor simultaneous nitrification and denitrification
The sewage-treatment plant of nitrification, wherein：The processing unit includes raw water water tank, intake pump, regulating valve, flowmeter, still exposure
Air film bioreactor, gas flowmeter I, pressure gauge air compressor machine, hydrophobic hollow fiber membrane module, circulating pump；The raw water
Water tank is connected by intake pump, regulating valve, flowmeter with Membrane Aeration Biofilm Reactor, and sewage is given birth to by bubble-free aeration film
Flowed out in an overflow manner by delivery port after thing reactor for treatment, reactor uses the plug-flow method of operation；It is located at bubble-free aeration film
One end of hollow fiber film assembly in bioreactor is connected with air compressor machine by air pipe, and gas flowmeter is set on pipeline
Ith, pressure gauge, the other end of hollow fiber film assembly is connected by air pipe and control valve with gas flowmeter II, and monitoring passes through
The residual gas flow that component is not utilized, the difference of flow meter II can be considered aeration quantity, Membrane Aeration Biofilm Reactor side
Sample tap I, sample tap II, sample tap III, delivery port, bubble-free aeration membrane bioreaction are provided with while holding on this side from the bottom up
Answer device bottom to be connected with the reactor side close to delivery port bottom by water lines, circulating pump is provided with the water lines top
The sewage-treatment plant for realizing synchronous nitration denitrification denitrogenation is formed, air compressor machine and control valve are used for the aeration pressure of adjusting part
Power, circulating pump is used for the startup biofilm of hydrophobic microporous membrane Membrane Aeration Biofilm Reactor.
There is provided a kind of processing of the sewage-treatment plant of utilization bubble-free aeration bioreactor synchronous nitration and denitrification simultaneously
Method.
Effect of the invention is that the apparatus and method of the bubble-free aeration bioreactor synchronous nitration and denitrification overcome biography
System technique nitrification and denitrification process is carried out or sequentially carried out not in same reactor in two different reactors
Foot, while reducing energy consumption and material consumption.Anti-nitration reaction equipment can be reduced, capital cost is saved；The alkali that denitrification process is produced
The acid of nitrifying process generation can partly be neutralized, can effectively pH stablizes relatively in maintenance reaction device, reduce adding for alkali lye.Exposing
Air (or pure oxygen) is entered in water body with minimum bubble or even still form during gas, obtains higher coefficient of oxygen utilization,
Even up to 100%, and aeration process does not produce macroscopic bubble, it is to avoid using easily waving in sewage during tradition aeration
Hair property and poisonous and harmful substance are escaped with bubble, and environment is polluted into air.Meanwhile, it is 0.04MPa in aeration pressure
When, obtain 74.67% TN clearances, now the dynamics of nitrification and denitrification process basically reach balance, during this
Nitrogen-removing rate is high, will not produce the nitrogen oxides such as nitric oxide, reduce air pollution.In addition, being only 0.06MPa in aeration pressure
When, COD clearances can reach 93%, and in C/N ratios close in the case of 6, nitrification efficiency reaches 99.24%, anti-nitre
It is that 83.75%, TN clearances reach that 85.42%, COD clearances maintain more than 80% all the time to change efficiency, therefore can be used for giving birth to
The denitrogenation of sewage living and except carbon, device flow is simple, it is easy to operate, energy consumption is relatively low, is a kind of new sewage-treatment plant.
Brief description of the drawings
Fig. 1 is the apparatus structure schematic diagram of bubble-free aeration bioreactor synchronous nitration and denitrification method of the present invention；
Influences of the Fig. 2 for aeration pressure to bubble-free aeration bioreactor synchronous nitration and denitrification method denitrogenation of the present invention；
Conversions and COD of the Fig. 3 for water inlet C/N to bubble-free aeration bioreactor synchronous nitration and denitrification nitrogen of the present invention are removed
Influence；
The influence that Fig. 4 converts for water inlet HRT to bubble-free aeration bioreactor synchronous nitration and denitrification nitrogen of the present invention；
Fig. 5 is contained COD, NH in water outlet under the conditions of three kinds of difference C/N ratios4 +-N、NO3-N、NO2- N, TN content；
Fig. 6 is nitrogen content situation in water outlet under different hydraulic detention times (HRT).
1st, raw water water tank 2, intake pump 3, regulating valve 4, flow meter I 5, Membrane Aeration Biofilm Reactor 6, gas flowmeter
II 7, pressure gauge 8, air compressor machine 9, hydrophobic hollow fiber membrane module 10, control valve 11, gas flowmeter II 12, sample tap I 13,
The sample tap III 15 of sample tap II 14, delivery port 16, circulating pump
Embodiment
Below in conjunction with the accompanying drawings to the sewage-treatment plant of bubble-free aeration bioreactor synchronous nitration and denitrification of the invention
And processing method is illustrated.
The sewage-treatment plant of the bubble-free aeration bioreactor synchronous nitration and denitrification of the present invention is as shown in figure 1, at it
Reason method design philosophy is that the device uses hydrophobic microporous membrane bubble-free aeration, and oxygen is spread with molecular state, and almost 100% is inhaled
Receive；Synchronous nitration and denitrification technology realizes that nitrification, denitrification are completed simultaneously in same reactor, shortens the removal pathway of nitrogen,
Reduce adding, improving nitric efficiency for organic carbon source；Shadow of the anti-nitration reaction production alkali additional nitration reaction production acid to system pH value
Ring, keep system pH to stablize relatively.In addition, by microbial identification technology, from biomembrane of the microbiology angle to system, master
The biological community structure of body feed liquid is analyzed, and specifies the respective effect of biomembrane, main body feed liquid, and feasible system is specific de-
The control of nitrogen process.The hydrophobic micropore hollow-fibre membrane of the device has two work(of gas diffusion paths and biofilm carrier
Energy.Pressed gas is by hydrophobic micropore hollow-fibre membrane inner chamber, using pressure differential as motive force, micropore of the gas on membranous wall
Passage diffuses to the outside of hollow-fibre membrane；The outside attached biological film of hollow-fibre membrane.Oxygen and organic matter, nitrogen, phosphorus etc. are sought
Foster substrate enters internal from the both sides of biomembrane respectively, occurs incorgruous mass transfer in biomembrane.Biomembrane/liquid interface (or
Biomembrane outer layer), organic concentration is maximum and dissolved oxygen concentration is minimum；It is (or biological in hydrophobic microporous membrane/biology membrane interface
Film inner layer), then contrast.This incorgruous mass transfer characteristic makes nitrifier be grown on biology in biological film inner layer, denitrifying bacterium
Film outer layer, forms aerobic nitrification, the ideal place of anaerobic denitrifying coexistence.The microbial growth and metabolism function of different biofacies
It is able to mutually coordinated and suppresses, microorganism harmoniously grows in the range of a metastable biofilm thickness, in biomembrane
Hyperoxia low carbon concentration near layer promotes the aerobic layer on the generation of nitration reaction, this layer to be easy to carry out organic carbon oxidation reaction,
And the anaerobic layer existed near biomembrane outer layer maintains the progress of anti-nitration reaction.The control of main body feed liquid is anoxic/detest
Oxygen environment, under the collective effect of simultaneous oxygen bacterium and anaerobic bacteria, completes denitrification denitrogenation process.Therefore, biomembrane-master in reactor
Body feed liquid collectively forms denitrification system, while realizing nitration reaction, anti-nitration reaction and different oxygen aminating reaction, reaches and removes simultaneously
The purpose of organic matter and nitrogen.
As shown in figure 1, can in the sewage-treatment plant of the bubble-free aeration bioreactor synchronous nitration and denitrification of the present invention
Synchronous nitration and denitrification process is realized, the device includes：1 raw water water tank, 2 intake pumps, 3 regulating valves, 4 flow meter Is, 5 still exposures
Air film bioreactor, 6 gas flowmeters II, 7 pressure gauges, 8 air compressor machines, 9 hydrophobic hollow fiber membrane modules, 16 circulating pumps；
Wherein described raw water water tank 1 is connected by intake pump 2, regulating valve 3, flowmeter 4 with Membrane Aeration Biofilm Reactor 5, dirty
Water is flowed out in an overflow manner after being handled by Membrane Aeration Biofilm Reactor 5 by delivery port 15, and reactor is transported using plug-flow
Line mode；One end of hydrophobic hollow fiber membrane module 9 in Membrane Aeration Biofilm Reactor 5 is connected with air compressor machine 8 by pipeline,
Gas flowmeter 6, pressure gauge 7 are set thereon, and the other end of hydrophobic hollow fiber membrane module 9 is by pipeline and control valve 10 and gas
Flowmeter 11 is connected, and the residual gas flow that monitoring is not utilized by component 9, the difference of gas flowmeter 6,11 can be considered aeration
Amount.Air compressor machine 8 and control valve 10 are used for the aeration pressure of adjusting part 9, and circulating pump 16 is used for hydrophobic microporous membrane bubble-free aeration
The startup biofilm of membrane bioreactor 5.Numbering 12,13,14 is respectively I, II, III sample tap, and 15 be delivery port.Described is hydrophobic
DO in property microporous barrier bubble-free aeration bioreactor is determined by portable dissolved oxygen instrument, and by adjusting air compressor machine 8
Pressure regulates and controls the DO values in hydrophobic microporous membrane bubble-free aeration bioreactor synchronous nitration and denitrification reactor.Described dredges
PH in aqueous microporous barrier bubble-free aeration bioreactor is determined by portable pH meter, is determined whether according to surveyed pH size
Exogenously added alkali and dosage.
Fig. 2 is biofilm stage COD removal effects, it was found from figure, in experiment operation 45 days, clearance of the system to COD
It is gradually increasing, when reaching stable state, effluent COD concentration is about 43.64mg/L, and COD clearances are 84% or so.
Fig. 3 is that system starts the biofilm stage to NH4 +- N removal situation, as seen from the figure, before experiment in 45 days, system pair
NH4 +- N removal effects are preferable, when reaching stable state, NH4 +- N clearances are more than 90%, but as microorganism is to nutriment
Decompose biomass on oxidation, film to continue to increase, to NH4 +- N clearance is improved also with the increase of biomass.With
The growth of biomembrane, NH4 +The but sustainable growth and up to 90% of-N clearances, illustrates that the microorganism with nitrification function still exists on film
Fast-growth, wherein NH4 +- N clearances reach as high as 96.46%.The specific operating procedure for starting biofilm is as follows：
1. system starts
In order to improve biofilm efficiency and ensure bubble-free aeration, operating pressure is less than bubble point.Seed sludge is derived from certain sewage
Manage factory A2/ O technique Aerobic Pond returned sludges, the technique can realize synchronous nitration and denitrification well while organics removal
Denitrification process, therefore the biofilms domestication for being conducive to this to test.The MLSS for originating sludge is 5833mg/L, and settling ratio (SV) is
38%.
2. biofilm is tamed
NaHCO is added in water distribution3PH is adjusted, it is 7.0~8.0 to control pH.Take sludge slow from reactor head along wall
Ground is added in reactor.Then, intake pump is opened, artificial sewage is slowly added to.
Because this process of the test is designed as plug-flow, agitating device is not set, in order that biofilm process keeps sludge suspension state,
System sets circulating pump (being only limitted to the biofilm stage), and internal circulating load is the 4-10% of total measurement (volume), and internal circulating load gradually increases.
There is a process gradually adapted to new environment in view of domestication stage microorganism, therefore the change amount of artificial distribution is divided
Three phases are carried out, and respectively 1/3,2/3, the 1 of reactor volume is respectively run 15 days.
After biofilm 45 days, the biomembrane of attachment is gradually fine and close, and color is changed into dark brown step by step from light brown.Biofilm thickness
Also become uniform with its own amplification with washing away for current.At the same time, MABR gradually strengthens the removal ability of COD and nitrogen,
And the removal effect to total nitrogen is gradually obtained, reactor effluent index reaches stabilization, show that biofilm successfully starts formal examination
Test.
3. operation operation:
Sewage is added to raw water water tank 1, starts intake pump 2, sewage is pumped into the life of hydrophobic microporous membrane bubble-free aeration
In thing reactor 5, hydrophobic hollow fiber membrane module 9 is oxygenated using air compressor machine 8, regulation air compressor machine control aeration pressure
For the 1/5~2/3 of bubble point (use polypropylene hollow fiber membrane, 0.01-0.03 microns of micropore size, bubble point is 0.07MPa), protect
The DO values in reactor 5 are held in 0.5~1.1mg/L.Make current by controlling to adjust valve 3, flowmeter 4 with compared with low velocity plug-flow extremely
The top of reactor 5, overflow outflow.
Changing water inlet kelvin nitrogen concentration controls water inlet C/N to be 6, controls water inlet HRT to be 12h by regulating valve 3, flowmeter 4,
Now, hydrophobic micropore aeration membrane bioreactor synchronous nitration denitrification denitrogenation best results.
The method that hydrophobic micropore of the present invention is aerated membrane bioreactor synchronous nitration denitrification denitrogenation, with following excellent
Point：
1. synchronous nitration denitrification denitrogenation technology is given birth to applied to hydrophobic microporous membrane bubble-free aeration bioreactor for treatment
During sewage living, system pH maintains to stablize relatively, without additional alkali source；Realize in same treatment space in a reactor
Synchronous nitration and denitrification, device flow is simple, and volume is small, and nitric efficiency is high, invests low.
2. by hydrophobic microporous membrane bubble-free aeration bioreactor be applied to synchronous nitration denitrification denitrogenation during, oxygen and
The utilization rate of energy is improved, and floor space reduces, and oxygen demand can easily realize modularization and further by adjusting oxygen-supplying amount control
Upgrading.
3. anaerobic nitrification layer is in biomembrane outermost layer, is conducive to controlling biofilm thickness, can obviously reduce sludge yield,
It is particularly evident to high concentration wastewater treatment.Nitrifier is in biological film inner layer, and hyperoxia low-carbon environmental benefits are fast in obtaining high nitrification
Rate, the nitrate that nitration reaction is produced in addition saves additional carbon and adds as denitrifying electron acceptor
4. during hydrophobic microporous membrane Membrane Aeration Biofilm Reactor synchronous nitration and denitrification of the present invention, nitration reaction
Nitrate nitrogen, the nitrite nitrogen of generation are converted into nitrogen discharge in the presence of denitrifying bacterium.Traditional biological denitrogenation is theoretical, high
The primary product that denitrifying bacterium is acted under the conditions of oxygen is N2N is produced under O, hypoxia condition2, therefore, hydrophobic microporous membrane of the present invention without
The synchronous nitration denitrification denitrogenation process of bubble aeration membrane bioreactor reduces the spilling of nitrogen oxides, it is to avoid produce a large amount of greenhouses
Gas, is a kind of green biological denitrification method.
5. hydrophobic microporous membrane Membrane Aeration Biofilm Reactor synchronous nitration and denitrification method of the present invention be nitration reaction,
Anti-nitration reaction occurs simultaneously in hydrophobic microporous membrane Membrane Aeration Biofilm Reactor, and denitrification is produced during being somebody's turn to do
OH- can neutralize the part H that nitrification is produced+, the fluctuation of pH value is reduced, two bioprocesses is benefited simultaneously, improves
Reaction efficiency, and additional alkali number can be reduced, reduce operating cost.
6. the characteristics of being easy to control with reference to film bubble-free aeration bioreactor, can by the aeration pressure of regulator control system, enter
Water C/N ratios, water inlet HRT, realize nitration reaction, the balance of anti-nitration reaction, improve nitric efficiency.
In process of the test, test water is sanitary sewage, and raw water COD is 220~250mg/L, and total nitrogen is 24~75mg/L.
Seed sludge is derived from certain sewage treatment plant A2/ O technique Aerobic Pond returned sludges, the technique can be very well while organics removal
Realize synchronous nitration denitrification denitrogenation, therefore the biofilms domestication for being conducive to this to test.The MLSS for originating sludge is 6000
~8000mg/L, settling ratio (SV) is 20~50%.As shown in Figure 1, the submergence of membrane module is pilot system in reactor
The 1/3 of height for reactor.
(5) specific operation operation is as follows：
1. the startup of system
A, bubble point measure
Clear water is filled into reactor, by adjusting air compressor machine to hydrophobic membrane intracavitary gradually forced air, film group is forced into
When part surface just produces micro-bubble, record pressure is 0.07MPa, as bubble point.
B, biofilm domestication
The formation of hydrophobic microporous membrane bubble-free aeration bioreactor biomembrane is the attachment of suspension microorganism, and microorganism exists
The process of growth and breeding on carrier membrane module, therefore the experiment is using circulation biofilm mode.In order to improve biofilm efficiency and ensure
Bubble-free aeration, aeration pressure is adjusted to the pressure of slightly less than bubble point.Water intake mode is the continuum micromeehanics in the presence of circulating pump 7,
Concrete operations are as follows：
1. NaHCO is added in water distribution3PH is adjusted, it is 7.0~8.0 to control pH.Seed sludge is taken from reactor head along device
Wall is slowly added into reactor.Intake pump is opened, artificial sewage is slowly added to, reaches the mixeding liquid volume in reactor
The dischargeable capacity of reactor.
2. because this process of the test is designed as plug-flow, agitating device is not set, in order that biofilm process keeps sludge suspension shape
State, system sets circulating pump (being only limitted to the biofilm stage), and internal circulating load is the 4-10% of total measurement (volume), and internal circulating load gradually increases.
3. consider that domestication stage microorganism has a process gradually adapted to new environment, therefore the change amount of artificial distribution
Point three phases are carried out, respectively reactor volume 1/3,2/3,1 times.
4. when biofilm is completed, the biomembrane of attachment is gradually fine and close, and color is changed into dark brown step by step from light brown.Biological thickness
Degree also becomes uniform with washing away for current with its own amplification.At the same time, hydrophobic microporous membrane bubble-free aeration of the present invention is biological anti-
Answer device synchronous nitration and denitrification system gradually to strengthen the removal ability of COD and nitrogen, reactor effluent index reaches stabilization, hang
Film successfully starts formal test.
C, startup effect analysis
Startup stage predominantly detects COD, NH4 +- N removal, it is specific to remove situation as shown in Figure 2,3.In experiment operation
45 days in, system is to COD, NH4 +- N clearance is gradually increasing, during to stable state, and water outlet COD clearances are in 84%, NH4 +- N clearances are more than 90%.
D, influence factor control analysis
It is micro- to hydrophobicity that the present invention investigates aeration pressure, water inlet C/N, water inlet HRT using sanitary sewage as process object, respectively
Hole is aerated the influence of membrane bioreactor synchronous nitration and denitrification.0.85~2.02kg/ of inlet COD loading (m3D), pH 7.5
~8.5, under the conditions of 20 DEG C~30 DEG C of temperature, aeration pressure for bubble point 1/5~2/3, water inlet C/N ratio respectively 3,6,9, intake
HRT be 4,8,12,24h when, synchronous nitration and denitrification and remove COD effect, as shown in Figure 4,5, 6.
Fig. 4 is sewage-treatment plant (such as Fig. 1) of the aeration pressure to bubble-free aeration bioreactor synchronous nitration and denitrification
Nitrogen conversion and removal influence.As shown in Figure 4, Nitrification rate increases with the increase of aeration pressure, and aeration pressure is as little as
During 0.02MPa, Nitrification rate is only 63.75%, and aeration pressure rises to 0.06MPa, and clearance is up to 96.50%.With aeration pressure
The increase DO values rise of power, aerobic nitrification bacterium increased activity, anaerobic denitrifying bacterium activity are suppressed, cause Nitrification rate to raise,
Denitrification rate is reduced.When be aerated pressure be 0.04MPa when, Nitrification rate is equal with Denitrification rate, make nitrification, denitrification process move
Mechanics reaches in a basic balance, TN clearances highest in MABR, obtains optimal denitrification effect, and its TN clearance is 74.67%.
Fig. 5 is contained COD, NH in water outlet under the conditions of three kinds of difference C/N ratios4 +-N、NO3-N、NO2- N, TN content.By scheming
Understand different C/N ratios under the conditions of, N02 -- N concentration is very low, not less than 1mg/L, water outlet N03 -- N concentration is then as C/N is worth
Increase and reduce, illustrate with the increase of C/N values, completely, nitration reaction turns into denitrification process for the comparison that anti-nitration reaction is carried out
Conditioning step, while also illustrating due to the raising of entering organic matter of water concentration so that nitre in aerobic heterotroph raised growth, biomembrane
Change bacterium proportion to decline, heterotroph and nitrifier competition nutritional substrate and dissolved oxygen are suppressed the propagation of nitrifier, and
Inhibit the progress of nitration reaction.Theoretical according to microenvironment, water inlet C/N values are higher, and aerobic heterotroph activity is more vigorous, to oxygen
Competitive utilization ability can be stronger, biomembrane and sludge flco DO transmission it is worse.If microenvironment tends to anaerobic condition, though it is unfavorable
Carried out in nitration reaction, but be conducive to anti-nitration reaction to carry out.In summary, think that MABR systems are same when C/N values are 6
Walk nitration denitrification best results.
Fig. 6 is nitrogen content situation in water outlet under different hydraulic detention times (HRT).As seen from the figure, when HRT is 4-12h,
Aerobic zone is the principal element for limiting denitrification effect inside biomembrane, and it is in appropriate adjustment biomembrane to reach the key efficiently denitrogenated
The volumetric ratio of aerobic zone and anoxic zone controls nitration reaction and the balance of anti-nitration reaction in reactor.When HRT extends from 12h
During to 24h, ammonia nitrogen and nitrogen removal rate increase more slow, and now aerobic zone has no longer been the main original for limiting denitrification effect
Cause, thus infers, the nitric efficiency for wanting further to improve synchronous nitration and denitrification can be by controlling anaerobic denitrifying area come real
It is existing.
As a result show：Effluent COD concentration<50mg/L、NH4 +- N concentration<3mg/L、NO2- N concentration<1mg/L、NO3- N concentration
<10mg/L, TN concentration<15mg/L, water outlet reaches one-level emission standard A.
Claims (4)
1. a kind of sewage-treatment plant of bubble-free aeration bioreactor synchronous nitration and denitrification, it is characterized in that：The processing unit
Include raw water water tank (1), intake pump (2), regulating valve (3), flowmeter (4), Membrane Aeration Biofilm Reactor (5), gas
Flow meter I (6), pressure gauge (7), air compressor machine (8), hydrophobic hollow fiber membrane module (9), circulating pump (16)；The raw water water
Case (1) is connected by intake pump (2), regulating valve (3), flowmeter (4) with Membrane Aeration Biofilm Reactor (5), sewage warp
Cross after Membrane Aeration Biofilm Reactor (5) is handled and flowed out in an overflow manner by delivery port (15), reactor is transported using plug-flow
Line mode；The one end for the hollow fiber film assembly (9) being located in Membrane Aeration Biofilm Reactor (5) passes through with air compressor machine (8)
Air pipe is connected, and gas flowmeter I (6), pressure gauge (7) are set on pipeline, and the other end of hollow fiber film assembly (9) passes through gas
Pipeline and control valve (10) are connected with gas flowmeter II (11), the gas flow that monitoring is not utilized by component (9), gas stream
Gauge (6), the difference of (11) can be considered aeration quantity；In Membrane Aeration Biofilm Reactor (5) side, sampling is set from the bottom up
I (12) of mouth, sample tap II (13), sample tap III (14), while end is provided with delivery port (15), the life of bubble-free aeration film on this side
Thing reactor (5) bottom is connected with reactor (5) side close to delivery port (15) bottom by water lines, in the water lines
The sewage-treatment plant of synchronous nitration denitrification denitrogenation, air compressor machine (8) and control valve are realized provided with circulating pump (16) formation in top
(10) it is used for the aeration pressure of adjusting part (9), circulating pump (16) is used for hydrophobic microporous membrane Membrane Aeration Biofilm Reactor
(5) startup biofilm.
2. the sewage-treatment plant of bubble-free aeration bioreactor synchronous nitration and denitrification, its feature according to claim 1
It is：The membrane material of the hollow fiber film assembly (9) is polypropylene, and its membrane aperture is 0.01-0.03 μm.
3. a kind of processing method of the sewage-treatment plant of utilization bubble-free aeration bioreactor synchronous nitration and denitrification, this method
Comprise the following steps：
1) open raw water box 1 on valve, by sewage by intake pump (2) by raw water box (1) be pumped into hydrophobic microporous membrane without
Steep in aeration and biological reactor cleaning system, water distribution is flowed into by reactor (5) bottom；
2) air compressor machine (8) and circulating pump (16) are opened, air compressor machine (8) is by non-vesicular forms into the membrane cavity of reactor membrane module 9
Aeration, it is poor that oxygen diffuses to form finite concentration by film interior, and oxygen is provided for bacteria metabolism in reactor (5)
Gas, circulating pump (16) makes sludge in the reactor 5, and the stage is in suspended state in the early stage, is conducive to the attached of membrane micro
, improve biofilm efficiency；
3) after the completion of biofilm, circulating pump (16) is closed, regulation intake pump peristaltic pump turn-button changes intake pump (2) rotating speed, with plug-flow
Mode (sewage enters from the bottom of reactor 5, and delivery port 15 is reached along water (flow) direction) is continued to run with, and completes simultaneous nitrification and denitrification nitre
Change process, the design parameter for realizing synchronous nitration denitrification denitrogenation is as follows：Aeration pressure is 1/2~2/3 bubble point pressure (bubble
Point is 0.07MPa), gas membrane flux is 80-120m3/(m2H), hydrophobic microporous membrane silk oxygen supply scope is 0-150mm, reaction
DO values are 0.5~1.1mg/L, 0.85~2.02kg/ of inlet COD loading (m in device (5)3D), water inlet C/N ratios are 6, pH 7.5
~8.5, under the conditions of 20 DEG C~30 DEG C of temperature, water inlet HRT is 12h, and synchronous nitration and denitrification rate is optimal, and nitrification efficiency is
94.03%, the clearance that denitrification efficiency is 85.40%, TN is 80.63%, and organic removal rate is up to 83.80%；
4) outlet pipe is connected into the reactor (5) top, water producing tank is entered in an overflow manner and is discharged；
5) other end of hollow fiber film assembly (9) is connected by air pipe and control valve (10) with gas flowmeter II (11),
The residual gas flow that monitoring is not utilized by component (9).
4. processing method according to claim 3, it is characterized in that：The biomembrane on hydrophobic hollow fiber film surface completes complete
The nitrification in portion, the NO that nitrifying process is produced3- N parts are utilized by the denitrifying bacterium on biomembrane is converted into N2, make remaining
NO3- N is removed by the effect of the denitrifying bacterium in main body feed liquid.
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