CN110255821A - A kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal system and method based on ammonia nitrogen absorption - Google Patents
A kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal system and method based on ammonia nitrogen absorption Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- 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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F2001/007—Processes including a sedimentation step
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- 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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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
Abstract
The invention belongs to water environment protection fields; specifically provide a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal system and method based on ammonia nitrogen absorption; this method is the improvement for conventional SBR technique: (1) using and increase These powdered adsorbents in system; it can promote the absorption of sludge and adsorbent to ammonia nitrogen, while promoting the sedimentation of sludge；(2) additionally increase an anaerobic pond；(3) change the carrying out practically program of original SBR.Sewage enters sbr reactor pond after anaerobic pond, and the cyclic program in sbr reactor pond is water inlet → anoxic → precipitating and draining → aeration.This method SBR runs program part and the most important difference of conventional SBR first is that increasing preposition anaerobic pond, second is that precipitating water outlet is carried out after anoxic program immediately, and being aerated is carried out to the sludge after sedimentation and drawing.This method is suitable for the town sewage of low ratio of carbon to ammonium, and denitrogenation dephosphorizing efficiency is higher, and simple process, low energy consumption.
Description
Technical field
The invention belongs to water environment protection fields, and in particular to the improvement of conventional SBR biological denitrification phosphorous removal technique especially relates to
And a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal system and method based on ammonia nitrogen absorption.
Background technique
During urban wastewater treatment, removes total nitrogen and total phosphorus is respectively necessary for meeting certain organic object amount, due to current
Town sewage plant entering organic matter of water concentration is generally relatively low, causes town sewage nitrogen phosphorus ligands difficult.Town sewage plant usually stresses
Removed in by total nitrogen, and the removal of total phosphorus can be completed to a certain extent by dosing, for low ratio of carbon to ammonium sewage how
Improve the critical issue that nitrogen removal rate is current urban wastewater treatment.
Traditional biological carbon and phosphorous removal method is AN/ O technique, on the one hand its nitrogen removal rate is difficult to improve the technique, separately
Its outer demand to carbon source is also higher, generally requires and meets carbon-nitrogen ratio not less than 4.0.The technique is as follows: AN/ O process spent water is first
It is introduced into anoxic pond (pond A), the nitrate of the organic matter of water inlet and reflux (containing reflux and sludge reflux in sewage) carries out anti-nitre
Change reaction, the denitrification percent of the technique depends on reflux ratio, if reflux and sludge reflux add up to 350% in sewage, theoretically
Nitrogen removal rate can achieve (350 ÷ 450) × 100%=77.8%.If desired denitrification percent is further increased, then only into one
Step increases reflux ratio, but the excessive one side reactor volume of reflux ratio increases, power consumption increases, and on the other hand also results in scarce
Oxygen and aerobic boundary have been hard to tell, anoxic pond and two reactors of aerobic tank see on the whole closer to be one completely
The reactor of mixing pattern, denitrification percent can not further increase at all, and nitrogen removal rate generally can only when the technique actual motion
Reach 70% or so.
In addition, each reactor is to be thoroughly mixed form, in order to maintain removal of the hypoxia response (denitrification) to nitrogen, lacking
Organic concentration in oxygen reaction tank cannot be too low, and this partial organic substances will necessarily be oxidized removal in aerobic tank.For de-
This partly belongs to invalid carbon source for nitrogen, this part carbon source generally account for wastewater influent organic matter 1/3 or more (specific value with
Relating to parameters, the low then denitrification percent of reflux ratio is low, and organic matter waste is more；Vice versa), cause theoretical based on traditional biological denitrogenation
Demand of the denitrification process of (anaerobic-aerobic) to carbon-nitrogen ratio is significantly higher than theoretical value.Demand of the technique to carbon-nitrogen ratio is larger, if
Lower than 4.0, it usually requires supplementation with carbon source and can maintain nitric efficiency carbon-nitrogen ratio.The presently relevant specification regulation in China, denitrogenation dephosphorizing
When, the carbon-nitrogen ratio and carbon-phosphorus ratio of sewage are not less than 4 and 17 respectively；When going to denitrogenate phosphorus simultaneously, need to meet above-mentioned carbon-nitrogen ratio simultaneously
With the requirement of carbon-phosphorus ratio.
In practice for simple denitrification process, in traditional ammonification, nitrosation, nitrification, denitrification process, denitrification is anti-
Answer device preposition, denitrifying carbon source at least needs to meet following condition: NO simultaneously3 -Reduction, cell Proliferation and aerobic respiration process
Required organic matter.Theoretically, 1molNO3 -(14g) is reduced to N2Gas, N are reduced to 0 valence from+5 valences, need 1.25mol O2
Corresponding organic matter (i.e. the ThOD of 40g), if according to 40g BODLIt calculates, that is, BOD5For 27.4g (oxygen consumption rate constant
k1Take 0.1d-1, i.e. BOD5=0.684BODL, with BODLInstead of theoretical oxygen demand), then denitrifying oxygen equivalent coefficient is complete in carbon source
It is only 1.96gBOD in the case where being utilized entirely by denitrification5/gNO3-N.It is contemplated that whole process will form 0.45g cell
(conversion oxygen is 0.64g, cell oxygen equivalent coefficient 1.42), denitrifying oxygen equivalent coefficient is 2.60gBOD5/gNO3(the Shen-N or so
It shines good, " biological wastewater treatment new technology ", China Environmental Science Press；Ren Nanqi, " water pollution control philosophy and technique ", clearly
Magnificent university press；Jiang Zhanpeng, " Environmental Engineering ", Higher Education Publishing House).It further contemplates and is still needed to during anoxic
The presence of a small amount of oxygen molecule is wanted, aerobic respiration simultaneously non-fully stops, this part oxygen can also consume organic matter, then be additionally required 0.1-
0.4gBOD5/gNO3-N.Consider above-mentioned all aspects, then it is 2.7-3.0gBOD that denitrifying oxygen equivalent coefficient is practical5/gNO3-N
Left and right (considers according to common sanitary sewage, is then approximately 3.7-4.1gCOD/gNO3- N), hence it is evident that lower than traditional denitrification process work
About 4.0g BOD actually required in journey5/gNO3-N.It causes to need organic object amount increased the reason is that technique in actual process
In there is significant component of organic matter to be utilized by heterotrophic microorganism, be converted into CO2And H2O, this partial organic substances is actually
It is " wasted ".
Technique traditional at present, such as AN/ O technique, A/A/O technique (inversion A/A/O technique), SBR technique and its various changes
Shape technique, UCT technique etc. are thoroughly mixed due to belonging in anoxic reacter property main body, and there are machine objects in various degree for institute
The phenomenon that being consumed by heterotrophic microorganism.Above-mentioned process flow no matter how optimization design, the demand of carbon-nitrogen ratio is usually also required to
4.0, hence it is evident that be higher than denitrifying oxygen equivalent coefficient actually required.In addition, the theoretical removal rate of above-mentioned technique total nitrogen is generally
It is difficult (if the excessive theoretically nitrogen removal rate of reflux ratio can be improved, but to be easy to cause capital expenditure excessive more than 75%, transport
Capable the disadvantages of energy consumption is high), nitrogen removal rate can frequently even be lower than 70% in practical projects.
Being intake based on current urban wastewater treatment firm, universal carbon source is insufficient, and carbon-nitrogen ratio is less able to meet and want not less than 4
It asks, therefore seeks very urgent suitable for the high efficiency, low cost denitrogenation technology of low-carbon-source.The main counter-measure taken at present, which has, to be changed
Become a variety of methods such as water inlet strategy, Anammox, short-cut nitrification and denitrification, endogenous denitrification, hydrogen autotrophic type denitrification, is not having
Additional carbon substance usually can be also selected in the case where the counter-measure having had.Additional carbon is simple, but with high costs, sewage plant
The carbon source for being difficult to bear, and adding needs precisely, excessive or very few all improper, therefore reacts and be difficult to control；Change water inlet strategy
At present usually using measures such as substep water inlets (multipoint water feeding), but process flow is more complex, and structures are more, and operating cost significantly increases
Add；Anammox technology can fundamentally solve the problems, such as carbon source deficiency, but the condition that Anammox needs is very
Harshness applies in general to the industrial wastewater of high ammonia nitrogen, urban wastewater treatment field is difficult to apply to, currently based on Anammox
The denitrification process of method exploitation is applied to urban wastewater treatment still without mature technology；Multistage AO tandem process and substep are intake
It is similar, multiple anoxic ponds and aerobic tank are connected, water inlet is divided into multichannel, intakes at each anoxic pond, which has preferable
Denitrification effect, but the removal rate of the technique denitrogenation depend on AO series connection series, series connection the more denitrification effects of series it is better,
Series excessively necessarily causes technique structures very more, and operating cost dramatically increases.
Summary of the invention
Present invention aims to overcome that the shortcomings that prior art, provides a kind of low-carbon-source sewage based on ammonia nitrogen absorption and change
Good SBR biological carbon and phosphorous removal method, to solve the problems, such as that prior art nitrogen removal rate in the insufficient situation of carbon source is low.
The present invention through the following technical solutions to achieve the above objectives:
The low-carbon-source sewage Modified SBR biological carbon and phosphorous removal system based on ammonia nitrogen absorption that the present invention provides a kind of, including
Anaerobic pond and sbr reactor pond are equipped with an anaerobic pond (hydrolysis acidification pool) according to water (flow) direction before the sbr reactor pond, one is detested
Oxygen pond can correspond to multiple sbr reactor ponds, also add small particle size, large specific surface area, valence in the sludge in the sbr reactor pond
Lattice are cheap and the biggish adsorbent of density, the Modified SBR for forming the mixture (hereinafter referred to as MSS) containing sludge and adsorbent are anti-
Ying Chi.
The adsorbent is that particle size is small, large specific surface area, cheap, density is big, adsorption capacity is high, chemical property
Stable powder sorbent；The density is big, refer to after adsorbent and sludge form MSS mixture overall apparent density compared with
Greatly, with activated sludge relative density for 1.002, adsorbent is 2.00 considerations, the work of the adsorbent and 15000mg/L of 1000mg/L
Property sludge mixing after MSS apparent density reach 1.064, sinking speed is 32 times of simple activity sludge, the exacerbation of adsorbent effect
It has been greatly facilitated the settling velocity of MSS, has considered further that the property precipitated in the method belongs to static state deposition, deposition efficiency is bright
It is aobvious to be higher than general continuum micromeehanics formula sedimentation basin, therefore even if the sedimentation time be short to 30min hereinafter, MSS concentration after its precipitating with
For traditional handicraft compared to can also be improved several times or more, MSS density is also easy to reach 22-26g/L or more that (discovery is up in experiment
To 60g/L or more).The MSS of high concentration may insure that (usual biological sludge accounts for the sludge concentration in hypoxia response program after precipitating
The ratio of MSS should be in 94-96% or so)；The adsorption capacity is high, refers to that adsorption capacity is preferably greater than 6mg/g, preferably not
Lower than 8mg/g, the adsorbent for otherwise needing to add excessively will affect process maintenance.
It is further preferred that being inhaled according to ammonia nitrogen of the adsorbent to the practical adsorption capacity of ammonia nitrogen, the density of adsorbent, sludge
The many factors such as attached performance and sludge age comprehensively consider adsorbent dosage, if ammonia nitrogen absorption capacity > 10mg/g under normal circumstances,
Adsorbent dosage (in terms of raw sewage, similarly hereinafter) 20~30mg/L；6~10mg/g of adsorption capacity, adsorbent dosage 40~
60mg/L；Adsorption capacity<6mg/g, adsorbent dosage>60mg/L.Add after adsorbent while needing to maintain the settleability of MSS
Can, meet in hydrostatic MSS settling velocity it is suitable > 1.0mm/s.If not being able to satisfy settling property, adsorbent dosage needs appropriate
Increase；If MSS is strong to ammonia nitrogen absorption performance and settling property is met the requirements, adsorbent dosage can be reduced in right amount.It is further excellent
Selection of land, the adsorbent are selected from modified superfine quartz sand powder or modified river sand.
The low-carbon-source sewage refers to BOD5/ TN concentration 2.8-3.2 raw water, when carbon-nitrogen ratio be higher than this range, carbon
Source can be extra, causes to be discharged BOD5Concentration increases water degradation；When carbon-nitrogen ratio is lower than this range, carbon source deficiency leads to part nitric acid
Salt cannot be restored thoroughly in time, and water outlet nitrite concentration increases.
Denitrification and dephosphorization method is carried out to low-carbon-source sewage using above system the present invention also provides a kind of, step includes:
Sewage is passed sequentially through into anaerobic pond, carries out anaerobism and SBR process in sbr reactor pond, the essence of sludge is in sbr reactor pond
The mixture (MSS) of activated sludge and adsorbent is improved sbr reactor pond operation program, formation water inlet → anoxic → heavy
Draining → aeration process is taken into account in shallow lake, i.e., the aerobic aeration program of SBR process operation of the present invention is after drainage procedure, and sewage is through heavy
It is expelled directly out after the processing of shallow lake, without aeration, is then aerated for the MSS for being trapped in sbr reactor pond, the MSS warp after precipitating
Preposition anaerobic pond is back to after aeration on a small quantity, remaining MSS is then trapped in sbr reactor pond；It is provided in the end of anoxic program non-
The aeration of normal short time is so that DO reaches aerobic state from anaerobic condition and (according to device parameter, can such as set program in pond
It is set to 1.0~2.0min), i.e. DO concentration reaches 2mg/L or more；And the aeration (aerobic) of traditional handicraft is directed to sewage, and
It carries out before precipitation, after precipitation process, sludge reflux to anaerobic pond.
In order to make MSS obtain high absorption ammonia nitrogen effect, need to maintain high MSS concentration, high MSS concentration relies primarily on
In the settling property of MSS, therefore need adsorbent density big, when density is larger and the adsorbent of presentation pulverulence is mixed with sludge
Greatly increase the difference of MSS and water density afterwards, thus the sedimentation of short time easy to accomplish and reach high MSS concentration；It is anti-in anoxic
Program is answered, activated sludge concentration is preferred (activated sludge accounts for MSS ratio about 94~96%) to be higher than 12000mg/L in pond, when scarce
When activated sludge concentration when oxygen reacts in pond is 12000mg/L or more, the ammonia nitrogen absorption that activated sludge itself can reach is total
Measure the degree up to 10-14mg/L.
Regulating system pH value is neutrality-alkalescent: Sludge Surface is negatively charged, and ammonia is most of at neutrality-alkalescent pH
With NH4 +Form exist (with NH4 +Nitrogen existing for form accounts for the ratio of various forms nitrogen summation, when the molar concentration of ammonia is
When 1mmol/L, almost 100% when pH is lower than 7；When pH is 7.0,99.4% is accounted for；When pH is 7.5,96.9% is accounted for；PH is 8.0
When, it accounts for 94.7%), therefore, when system pH value is set as neutrality-alkalescent, system is very favorable to the absorption of ammonia nitrogen, if
It is 0.8-1.2mg/g consideration according to the capacity of activated sludge absorption ammonia nitrogen, if activated sludge concentration when hypoxia response in pond is
12000mg/L or more, then since the ammonia nitrogen absorption total amount that activated sludge itself can reach also reaches the degree of 10-14mg/L；
It is further preferred that requirement of the nitrification and denitrification to pH value is considered, with pH value control in 7-8 for appropriate, this pH value range one
Aspect is conducive to denitrification denitrogenation, is on the other hand conducive to the adsorption capacity for playing sludge and adsorbent.In sludge and adsorbent
Dual suction-operated under, ammonia nitrogen concentration can achieve lower value after hypoxia response.If total nitrogen of intaking in 40-50mg/L or so,
Total nitrogen and ammonia nitrogen can control within 5-6mg/L (or close to this value) after anoxic, and nitrogen removal rate can achieve even super
Cross 85%.
For the reaction time in each stage, it is preferable that the time of anoxic phases is 2.5-3h, reaches strengthened denitrification purpose,
The shorter precipitate the better with water discharge time, but water discharge time should be consistent with flooding time, and the sedimentation time should be longer than water discharge time 15-
30min (i.e. precipitating starts to start drainage procedure after starting 15-30min, precipitates still carrying out at this time), the time of aerobic stage is
3.0-4.0h, can be nitrate by ammonia nitrogen exhaustive oxidation as basic demand.Wherein water inlet with anoxic phases some when
Between be overlapping, precipitating with some time of bleeding stage be it is Chong Die, specific each program time is distributed can be according to water of intaking
Matter situation flexible modulation.
It is further preferred that the water-filling ratio of the SBR technique is 0.4-0.5, it is equivalent to the reflux ratio of traditional AAO technique
(water-filling than small, it is big to be equivalent to reflux ratio), specific value should be examined according to various combined factors such as water quality parameters when operation
Consider.Water-filling considers sludge concentration than main, and the factors such as raw water quality, water-filling is than smaller, and ammonia nitrogen concentration is got over when anoxic program starts
Low, water outlet ammonia nitrogen concentration is also lower, and technological effect is better, but processing capacity is smaller (it is low to be equivalent to hydraulic loading)；Vice versa.
In addition, water-filling should not be too large than also, water-filling is easy to cause sludge concentration in reactor low than excessive, also will affect the effect of technique
Fruit.
The principle of the present invention are as follows: realized by adding adsorbent that is a certain amount of and meeting certain characteristic in system efficiently
Denitrogenation (can combine certain phosphor-removing effect).On the one hand the adsorbent added promotes sludge settling, due to adsorbent density
The settling property of MSS can be greatly facilitated after mixing with activated sludge greatly, it can also even if only passing through the precipitating MSS concentration of short time
Reach 22000-26000mg/L or more；Another aspect adsorbent itself has certain adsorption effect (also to have to phosphate radical ammonia nitrogen
There is certain adsorption effect, but surface is negatively charged, main sides heavily adsorb ammonia nitrogen).Sewage is after anaerobic processes, organic nitrogen conversion
For ammonia nitrogen, most of organic matter is converted into acid and alcohol of small molecule etc..Sewage enters sbr reactor pond after anaerobic pond.Water inlet
When sbr reactor pond in sewage be that the sewage for having already passed through nitration reaction that is stayed in pond by last circulation is (actually main
It is MSS), the nitrogen of sewage exists in the form of nitrate, and during water inlet and water inlet completes sbr reactor pond later and maintains always to stir
The anaerobic condition mixed, and micro oxygen supply is to maintain hypoxia response condition.By anoxic denitrification process, original nitrate in pond
Nitrogen is removed by denitrification, and the carbon source of water inlet is fully utilized as denitrifying reducing agent.Carbon source is several in addition to being used for dephosphorization on a small quantity
It is completely used for denitrification process, therefore utilization of carbon source rate is high.After hypoxia response, since reactor belongs to plug-flow reaction property
(time plug-flow, non-space plug-flow), thus nitrate and organic matter it is almost depleted (if carbon-nitrogen ratio deviate required value it is excessive, meeting
There is carbon source surplus or nitrate be superfluous), ammonia nitrogen seldom loss other than being diluted.But ammonia nitrogen is in adsorbent and high concentration
It under the collective effect of sludge, can largely be attracted to above MSS, being adsorbed the ammonia nitrogen concentration to dissociate in rear water can be down to
3-5mg/L。
The phosphor-removing effect of technique is mainly from three aspects: adding the suction of the chemical precipitation, adsorbent of molysite formation to phosphorus
Biological phosphate-eliminating is echoed, therefore generally dephosphorization efficiency is also higher.
The beneficial effects of the present invention are:
1) realize that denitrification percent is high under the premise of carbon source is low, while also dephosphorizing rate with higher.Theoretically in carbon-nitrogen ratio
Down to being not necessarily to additional carbon in the case where 2.8-3.2 or so.By estimating, in the case where normal operation, total denitrogenation removal rate can
To reach 85% or more, dephosphorizing rate can reach 90% or more.
2) simple process, low energy consumption.There are three dramatically different compared with conventional SBR technique for this technique: first is that in system
Increase adsorbent, second is that increase an anaerobic pond, third is that the operation program in sbr reactor pond have material alterations (aeration it is aerobic
Program is carried out for the MSS after precipitating).It is not directed to the oxidation process of organic matter, therefore total oxygen demand is few, needs carbon source few,
Aeration energy consumption is relatively low.
Although 3) need additionally to use adsorbent, adding for carbon source medicament is saved, low-carbon-source integrated wastewater is taken
Do not increased substantially with compared with conventional SBR technique.If there is mature cheap adsorbent supply, expense can be lower than tradition
Technique.
4) sbr reactor pond available depth improves, and sbr reactor pond dischargeable capacity only has whole dischargeable capacitys when due to aeration
50%-55% (value depends on water-filling ratio), therefore pool inner water position is lower (this point has basic difference with common SBR) when aeration,
And be aerated generally has certain requirement to diffuser depth of immersion, if diffuser depth of immersion takes 5.5-6.5m, sbr reactor pond
Available depth value is preferably 9-12m or so, this water depth value is significantly higher than traditional handicraft, and the land occupation face of structures can be significantly reduced
Product.
Detailed description of the invention
Fig. 1 is Modified SBR biological denitrification phosphorous removal technique flow chart of the invention；
Fig. 2 is the sbr reactor pond runing time distribution diagram of embodiment 1.
Specific embodiment
The application is described in further detail with reference to the accompanying drawing, it should be understood that embodiment described herein is only
For instruction and explanation of the present invention, it is not intended to limit the present invention process, construction, parameter of technique etc.；Given in embodiment
The example that is intended to be merely illustrative of the present of design parameter, and the parameter of nonessential use.Present embodiment is just to saying
The concrete application of a kind of bright low-carbon-source town sewage high-efficiency biological nitrogen and phosphorus removal method based on ammonia nitrogen absorption.Actually this method
It can be there are many variant, as long as generally meeting following features simultaneously is the scope of this patent:
It (1) is to be added based on adsorbent to promote ammonia nitrogen absorption and sludge settling；
(2) main process of sewage treatment belongs to SBR and its various modifications form；
(3) carrying out aeration to the sludge to precipitate is main body aeration process；
(4) under the premise of maintaining high denitrification percent, demand of the technique to carbon source is reduced as the main purpose.
Embodiment 1
A kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal system based on ammonia nitrogen absorption is present embodiments provided, is wrapped
Include: setting anaerobic pond one, sbr reactor pond several (usually 6 or 8), wherein anaerobic pond is made using mechanical impeller
To stir measure, directly to be aerated as stirring measure when sbr reactor pond is in aeration state, sbr reactor pond is in anoxic shape
It needs to maintain stirring, stirring measure when using mechanical impeller as anoxic when state.
Powder sorbent (modified superfine quartz sand powder or modified river sand can be used) is added in system, directly inhales powder
Attached dose is sprinkled into anaerobic pond or the pond SBR.Using the collective effect of sludge and adsorbent by ammonia nitrogen absorption.
In order to make sludge obtain high absorption ammonia nitrogen effect, need to maintain high sludge concentration, in hypoxia response program,
To be preferred higher than 12000mg/L, the activated sludge concentration when hypoxia response in pond is activated sludge concentration in sbr reactor pond
When 12000mg/L or more, the degree of ammonia nitrogen absorption total amount that activated sludge itself can reach up to 10-14mg/L.This implementation
In example, the dosage of adsorbent is 40-60mg/L, and powder sorbent and sludge form mixture MSS, utilizes sludge and adsorbent
Collective effect by ammonia nitrogen absorption.
Adjusting the pH value in sbr reactor pond is 7-8, and on the one hand this pH value range is conducive to denitrification denitrogenation, on the other hand
Be conducive to play the adsorption capacity of sludge and adsorbent.
The operation program in sbr reactor pond is that draining → MSS aeration is taken into account into water → anoxic → precipitating, wherein water inlet and anoxic
Some time is overlapping, and precipitating is Chong Die with some time of draining.According to device parameter, anoxic program end
There is the aeration of a very short time.
The carrying out practically program in sbr reactor pond should be carried out according to water quality requirement, and usual flooding time should meet one
Circulation time can just complete primary water inlet to one group of sbr reactor pond.If the circulation primary time is 8h, the SBR of one group of operation
Reaction tank quantity is n, then each sbr reactor pond flooding time is 8/n.Hypoxic exposure is examined according to specification, 0.5-3.0h
The technique of the present invention is considered for the purpose of strengthened denitrification, and value is preferably high, therefore uses 2.5-3.0h.Precipitating with water discharge time it is more short more
It is good, but usually water discharge time should be consistent with flooding time, and the sedimentation time should be slightly longer than water discharge time about 15-
30min.Aerobic time is preferably 3.0-4.0h, can be nitrate nitrogen by ammonia nitrogen exhaustive oxidation as basic demand.Specifically
Each program time distribution should also be according to influent quality situation flexible modulation.
The runing time in sbr reactor pond is distributed as shown in Figure 2 (by taking 8h circulation primary as an example): the wherein total 3h of water inlet+anoxic
(water inlet 1h, anoxic 2.6h have 0.6h overlapping), the total 1.4h of precipitating+draining (the precipitating later period is entirely to drain, and has 1h overlapping) are good
Oxygen 3.6h adds up to 8h circulation primary.
In addition, according to calculated result, if necessary, it is also necessary to which (1) aerobic stage needs if basicity is unsatisfactory for requiring
Certain alkaline matter is added, such as the feeding lime when sbr reactor pond is in aerobic；(2) when sbr reactor pond is in anoxic
Add methanol or other organic matters.Above-mentioned under normal conditions (1) is necessary measure, and (2) are to be arranged according to the selectivity that water quality carries out
It applies, if the BOD in water quality5/ TN concentration then needs suitably to increase carbon source less than 2.8.
The ability of municipal sludge absorption ammonia generally only has 0.5-0.8mg/g or so, traditional work under lower equilibrium concentration
Sludge concentration generally only has 4000mg/L in reaction tank in skill, then the ammonia nitrogen of traditional handicraft Adsorption at most can only achieve 2-
3mg/L.Therefore, it when control system sewage pH is 7-8, is combined in anaerobic pond and adds trivalent iron salt coagulant, or adopt
The mode being used in combination with ferric sulfate and ferrous sulfate, adds a certain amount of ferrous sulfate in the returned sludge of anaerobic pond, remains
The remaining molysite needed is added directly the method in anaerobic pond using ferric sulfate, and the capacity of sludge absorption ammonia nitrogen can be improved extremely
0.8-1.2mg/g。
When operation, water inlet initially enters anaerobic pond, and hydrolysis of organic matter is acidified in anaerobic pond, and itrogenous organic substance decomposes ammonia
Change, ammonia nitrogen is formed.A small amount of reflux MSS enters anaerobic pond, the release of phosphorus anaerobism.Seldom (i.e. carbon source is almost for COD loss in anaerobic pond
It does not lose).The maintenance of the sludge concentration of anaerobic pond has 2 approach: the reflux MSS bring sludge of high concentration and adding filler
Promotion forms biomembrane sludge.After Anaerobic Treatment, organic matter is converted mainly into the organic acid and alcohol etc. of low molecular weight, nitrogenous
Organic matter discharges ammonia.Sewage enters anoxic program after entering sbr reactor pond after anaerobism, in anoxic program, water inlet
Organic matter carbon source is largely utilized by denitrification, and nitrate nitrogen is reduced simultaneously is converted into nitrogen removal, and organic matter is oxidized to CO2
It is removed with water.Anaerobism program formed ammonia nitrogen have almost no change in anoxic program, but due in system MSS concentration it is big, take off
It has gone the MSS of nitrate to restore again to ammonia nitrogen absorption ability, therefore has been adsorbed in anoxic program ammonia nitrogen.Anoxic EP (end of program) is laggard
Enter to precipitate program, since the exacerbation of adsorbent acts on, precipitates progress quickly, be quickly completed mud-water separation.Precipitating proceeds to one
Draining of fixing time can start, therefore will not influence effluent quality because of Direct precipitation after anoxic.Water outlet carry out advanced treating or
Discharge, water outlet is only containing minimal amount of organic matter and suspended matter etc. and a small amount of ammonia nitrogen.Effluent quality and common SBR technique
It compares, ammonia nitrogen and total nitrogen content are lower, and the content of suspended matter and process operation have much relations, and being likely lower than may also be higher than
Conventional SBR technique.The MSS to precipitate enters aerobic program, and the ammonia nitrogen of absorption is oxidized to nitrite and nitrate, completes
One circulation.
According to the requirement of final outflow water water quality, sedimentation basin water outlet can with direct emission or take filtering-disinfection or other must
The measure wanted.If influent quality does not have specific question, total nitrogen and the ammonia nitrogen concentration being discharged after this process can be stablized
Lower than the concentration limit of GB18918-2002 level-one A；Other water quality indicators of water outlet can refer to common SBR technique.
This system is appropriate only for the processing of low-carbon-source sewage, and the low-carbon-source sewage refers to BOD5/ TN concentration exists
The raw water of 2.8-3.2, if water inlet carbon-nitrogen ratio variation is excessive or when being unsatisfactory for requiring, conditioning tank homogenizing can be arranged in the present system
An aerobic biofilm reactor is arranged after precipitating water outlet in water quality again.Aerobic biofilm reactor is arranged in water outlet can be with
Remaining BOD will be discharged5Or nitrite-oxidizing removal, the composition of ammonia nitrogen in water outlet total nitrogen is reduced, it is relatively simple.May be used also
It is with the measure taken: when carbon-nitrogen ratio is high, increases an Air supply facility in anoxic program front end, consume a part of organic matter,
The amount supplied oxygen just meets the needs of consuming extra carbon source；When carbon-nitrogen ratio is high, sludge sludge age can also be reduced, increases biology and removes
Phosphorus ratio shared in total phosphorus ligands；When carbon-nitrogen ratio is low, it is still necessary in anoxic program front end supplementary carbon source.
Embodiment 2
Present embodiments provide a kind of Modified SBR technique with beaker experiments approximate simulation this method.
Taking certain municipal wastewater treatment plant anaerobic pond sludge 10L, ferric trichloride 0.10g, (what is added is iron salt solutions, indirect reinforcing
Body, similarly hereinafter) 2h is stirred under closed environment, then precipitate 1h.The municipal wastewater treatment plant technique of taken sludge is Carrousel 2000
Oxidation ditch, preposition anaerobic pond, sludge reflux to anaerobic pond.It is dense to measure its ammonia nitrogen as anaerobism sewage for supernatant after taking precipitating
Degree is 15.3mg/L, total nitrogen concentration 17.1mg/L (raw sewage total nitrogen 37.7mg/L), CODCrConcentration is 101mg/L, BOD5For
49mg/L, the sewage carbon-nitrogen ratio is too low, supplements the BOD that a certain amount of glucose makes it theoretical5Reach 55mg/L, i.e., theoretically
Carbon-nitrogen ratio reaches 3.0.Since anaerobic pond sewage includes returned sludge, so value is compared with original water inlet sewage, parameters are dense
Degree is lower, and test data is the supernatant after precipitating herein.The high concentration sludge (MLSS 25700mg/L) of precipitating is exposed
During which gas 6h adds lime (CaO) to adjust pH value 7.5 or so, it is ensured that oxidation operation is properly completed with Ammonia Nitrification, as nitre
Change sludge.
Above-mentioned nitrifying sludge 550mL is added in the above-mentioned anaerobism sewage of 450mL, river sand 1.50g, ferrous sulfate is added
0.008g, first quickly then stirring is slowly stirred 3h in six coagulation stirrers, this process substantially simulates dirt with mixing sludge
The hypoxia response condition of water factory, even if measuring DO concentration in the process and adjusting revolving speed according to DO concentration to adjust DO concentration in mould
Quasi- anoxia condition, i.e. DO concentration control pH value and maintain alkalescent (7.0-8.0) in 0.20-0.50mg/L.
It is sampled after precipitating 30min, measurement supernatant ammonia nitrogen and COD concentration, with 0.45 μm of membrane filtration sewage before test.Knot
Fruit ammonia nitrogen concentration is 4.1mg/L, total nitrogen concentration 7.2mg/L, and nitrogen removal rate reaches 81%.Although compared with theoretical value partially
It is low, but in view of beaker experiments are poor to the control of reaction condition, it is efficient which can still illustrate that technology of the invention has
The feasibility of denitrogenation.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
Limitations on the scope of the patent of the present invention therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Protect range.
Claims (9)
1. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal system based on ammonia nitrogen absorption, which is characterized in that according to water flow
It has added in direction, including anaerobic pond and sbr reactor pond, the sbr reactor pond and/or anaerobic pond with ammonia nitrogen absorption ability
And the adsorbent that density is big, adsorbent and sludge form MSS mixture, realize the absorption to ammonia nitrogen, the fortune in the sbr reactor pond
Line program includes anoxic, precipitating and aerobic, and pending water is successively discharged after anoxic and precipitating in sbr reactor pond, precipitating
Sludge is partly refluxed to anaerobic pond after Aerobic Process for Treatment, and remainder is trapped in sbr reactor pond.
2. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal system based on ammonia nitrogen absorption according to claim 1,
It is characterized in that, the low-carbon-source sewage refers to BOD5Sewage of/TN the concentration in 2.8-3.2.
3. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal method based on ammonia nitrogen absorption, which is characterized in that using as weighed
Benefit requires any denitrification dephosphorization system of 1-2 to be handled, and step includes: that sewage is passed sequentially through anaerobic pond, sbr reactor
Pond is handled, and is improved to sbr reactor pond operation program, is formed water inlet → anoxic → precipitating takes into account draining → and be aerated
Journey, sewage are expelled directly out after precipitation process, are then aerated for the MSS for being trapped in sbr reactor pond, MSS is after being aerated
It is partly refluxed to preposition anaerobic pond.
4. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal method based on ammonia nitrogen absorption according to claim 3,
It is characterized in that, the adsorbent is the powder sorbent that density is big, adsorption capacity is high, chemical property is stable, the density
Refer to that the density contrast for increasing sludge and water using adsorbent, the adsorption capacity height refer to that adsorbent is suitable to the adsorption capacity of ammonia nitrogen greatly
Higher than 6mg/g.
5. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal method based on ammonia nitrogen absorption according to claim 3,
It is characterized in that, the dosage of the adsorbent meets: in terms of raw sewage, if adsorption capacity > 10mg/g of adsorbent, adsorbent
20~30mg/L of dosage；6~10mg/g of adsorption capacity, 40~60mg/L of adsorbent dosage；Adsorption capacity < 6mg/g, absorption
Agent dosage > 60mg/L；The settling property of MSS is added after adsorbent while needing to maintain, the MSS settling velocity in hydrostatic is met
>1.0mm/s。
6. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal method based on ammonia nitrogen absorption according to claim 3,
It is characterized in that, sludge concentration is higher than 12000mg/L in sbr reactor pond in hypoxia response program.
7. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal method based on ammonia nitrogen absorption according to claim 3,
It is characterized in that, adjusting denitrification dephosphorization system pH value is 7.0-8.0.
8. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal method based on ammonia nitrogen absorption according to claim 3,
It is characterized in that, the sbr reactor pool process stage, the time of anoxic phases is 2.5-3h, and precipitate phase starts rear 15-30min and opens
Dynamic drainage procedure, the time of aerobic stage are 3.0-4.0h.
9. a kind of low-carbon-source sewage Modified SBR biological carbon and phosphorous removal method based on ammonia nitrogen absorption according to claim 3,
It is characterized in that, the water-filling ratio in sbr reactor pond is 0.4-0.5.
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| CN111115815A (en) * | 2020-01-06 | 2020-05-08 | 华东理工大学 | Method for removing antibiotics in wastewater of dairy farm |
| CN114031242A (en) * | 2021-10-27 | 2022-02-11 | 上海市政工程设计研究总院（集团）有限公司 | Two-stage enhanced denitrification urban domestic sewage treatment method |
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| CN114031242A (en) * | 2021-10-27 | 2022-02-11 | 上海市政工程设计研究总院（集团）有限公司 | Two-stage enhanced denitrification urban domestic sewage treatment method |
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