CN102442725A - Method for increasing domestication efficiency of ammonia nitrogen sewage granule sludge - Google Patents
Method for increasing domestication efficiency of ammonia nitrogen sewage granule sludge Download PDFInfo
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Abstract
The invention discloses a method for increasing the domestication efficiency of ammonia nitrogen sewage granule sludge. The method comprises the following steps of: selecting activated granule sludge with denitriding capability; performing granular structure degradation on the activated granule sludge; inducing domestication and collecting sludge for performing granule reconstruction after inducing domestication; and performing adaptive screening domestication on granule sludge obtained by performing granule reconstruction by using ammonia nitrogen-containing wastewater by using granule sludge obtained by performing granule reconstruction. Compared with the prior art, the method has the advantages of higher domestication strength, more remarkable effect and higher efficiency. In the domestication process, the structural characteristics of the granule sludge are considered fully, and granular structure removing and granule reconstructing steps are added purposefully, so that the action of a mutagenic agent is more complete; and meanwhile, inducing and protoplast fusing methods are applied, so that the reconstruction probability is increased, the domestication strength is enhanced, and the domestication effect is more remarkable.
Description
Technical field
The present invention relates to a kind of method of handling ammonia-nitrogen sewage granule sludge domestication efficient that improves.
Background technology
Water is the basic assurance of human survival, and along with industrial expansion, when constantly obtaining economic benefit, the eutrophication of water body has become the focus of domestic and international close attention.And the discharging that exceeds standard of ammonia nitrogen is the one of the main reasons that causes body eutrophication.
The biological nitration effect is one of important step of nature nitrogen cycle.Aspect the improvement body eutrophication, nitrification exploitation nitration processes capable of using reduces ammonia content in the water body, unites with denitrification simultaneously and is used for bio-denitrifying sewage.Domestic in ammonia nitrogen waste water is handled, to use more sophisticated treatment process be biological deamination method, and its principle comprises aerobic nitrification and two stages of anaerobic denitrifying, promptly passes through nitrifier with the NH in the waste water
3-N is converted into NO
3-N, then by denitrifying bacteria with NO
3-N finally is converted into N
2Wherein nitrobacteria belongs to from nourishing one's nature bacterium, comprises two kinds of diverse metabolism crowds: nitrous acid Pseudomonas (nitrosomonas) and nitric acid Pseudomonas (nitrobacter), and respectively at NH
3-N is converted into NO
2-N stage, NO
2-N is oxidized to NO
3-N the stage works.
The granule sludge technology is to use the technology that biological process is more widely disposed of sewage in recent years, and the distinctive particle form of granule sludge makes it have advantages such as settleability is good, biological density is high, metabolic activity is strong; Especially aspect the processing ammonia nitrogen waste water; Granule sludge is under the situation of aeration, and the outside forms aerobic zone, the inner anaerobic zone that forms; Carry out the microenvironment that aerobic nitrification, inside are carried out anaerobic denitrifying thereby construct the outside, reach synchronous nitration-denitrifying purpose.Simultaneously, means such as the control through aeration rate, Optimum of culture medium can be controlled at NH with the aerobic nitrification route
3-N is converted into NO
2In-N the stage, reduced NO
2-N is oxidized to NO
3-N process, thus make denitrifying bacteria directly act on NO
2-N has simplified synchronous nitration-denitrification process, has formed short distance nitration-denitrification route.
Carrying out in the ammonia nitrogen waste water treating processes through biological process, the screening of nitrated bacterial classification, domestication, enrichment are extremely important, and therefore the focus of research concentrates on relevant bacterial screening, purifying and domestication aspect at present.Chinese patent CN200610010587.X has described a kind of screening method and screening of sewage treatment engineering bacterial strain and has used substratum; Chinese patent CN200710158374.6 has described a kind of method of screening nitrification bacteria; Be used for the industrial waste water with high ammoniac nitrogen treating processes, handle difficult problem to solve the high ammonia-nitrogen wastewater that the autotrophy nitrobacteria growth slowly brings in traditional wastewater biochemical treating processes.Participate in, appear the biological process of conditions of the current stage because the biological process ammonia nitrogen removal is one by many bacterial classifications, therefore above-mentioned these technology have only been carried out screening, purifying to part bacterial classification in the process, to the effect that improves nitrated level and not obvious.Chinese patent 200310111176.6 has been described a kind of within a short period of time, utilizes self technical process of WWT, and domestication nitrifier and denitrifying bacteria realize effectively handling the method for coked waste water.Such acclimation method is relatively harsher to the water quality requirement of sewage, if the righttest growing environment difference of handled sewage quality and mud is bigger, taming effect so can be not fine.Chinese patent 200910135717.6 has been described a kind of gene and strengthening that utilizes and has been carried out the directed novel method that makes up and regulate and control of aerobic particle mud function.This method will be carried the segmental mikrobe of removable functional gene as the donor bacterium; With half ripe or sophisticated granule sludge as recipient bacterium; Confession/recipient bacterium is carried out outside the system hybridizing in hybridization or the system, thereby make the mikrobe in the aerobic particle mud obtain the functional gene fragment and produce specific function.Because abduction mechanism does not have universality in the process; Except the special receptor bacterium is had certain effect, the method for this directional structure can only be a cell levels, rather than gene level; Its transformation as a result be not acceptor bacterium, but the inner bacteria culture of active particle mud constitutes.In the prior art, the domestication process of granule sludge generally needs the long period, and therefore, how improving domestication efficient is the problem that this area need solve.
Summary of the invention
To the deficiency of existing technology, the present invention provides a kind of method that improves the domestication efficient of granule sludge.
The present invention improves the method for handling ammonia-nitrogen sewage granule sludge domestication efficient and comprises following content: the activation granule sludge that selection has the ammonia nitrogen removal ability; The activation granule sludge is carried out the grain pattern degraded; Behind inducing and acclimating, collect mud and carry out particle reconstruct, the granule sludge that particle reconstruct obtains carries out flexibility screening domestication with nitrogen-containing wastewater.
In the inventive method; Activation granule sludge with ammonia nitrogen removal ability can come from the granule sludge that obtains in the biochemical ammonia nitrogen removal process of any sewage; Or the granule sludge of other biochemical processing procedure of sewage obtains the microorganism species that has the ammonia nitrogen removal function in this activation granule sludge after in containing ammonia-nitrogen sewage, taming.
In the inventive method, the degraded of the grain pattern of activation granule sludge is adopted and is improved culture system " NH
3-N " concentration causes the method for grain pattern degraded, perhaps adopts the sonic oscillation method that granule sludge is carried out structural degradation.Adopt and improve culture system " NH
3-N " when concentration causes the method for grain pattern degraded, " NH
3-N " concentration is general>=300mg/L, like " NH
3-N " concentration is 300mg/L～1500mg/L, dissolved oxygen is general>=1mg/L, is 1mg/L～8mg/L like dissolved oxygen; cultivate 2h～6h; destroy the method for grain pattern through this selective pressure, its grammar is an eutrophic environment to the aerobic bacteria of particle outer rim (mainly being nitrifier) to be provided, thereby makes its quick growth; destroyed the balance of whole cenobium, caused the degraded of grain pattern.But this process time is unsuitable long, and the hyper-proliferative of nitrifier will inevitably suppress the growth (mainly being denitrifying bacteria) of nucleus anerobes, is unfavorable for the particle reconstruct in later stage.Adopt the sonic oscillation method that granule sludge is carried out structural degradation, ultrasonic frequency is 25KHz～40KHz, and ultrasonic power density is 100W/L～400W/L (volume comprises the volume of reaction system and water-bath), and the time is 3min～15min.The sonic oscillation method is simple, but therefore the problem that system temperature raises in will the attention process be necessary to place water-bath to carry out whole reaction system, and controlled temperature is lower than 40 ℃, preferably is lower than 35 ℃.
In the inventive method; Inducing and acclimating after the grain pattern degraded adopts the conventional method in this area to carry out; Like methods such as physics inducement domestication or chemically induced domestications, can after inducing and acclimating, increase the protoplasma fusion process; To keep little oxygen environment at induction period, to take into account the tolerance of nitrifying bacteria community and denitrification flora to oxygen.Collection mud behind the inducing and acclimating adopts centrifugal collection method or filters collection method etc.
In the inventive method, the particle reconstructing method of mud is following behind the inducing and acclimating: the mud of collecting behind the inducing and acclimating adds in the nutrient solution, and making sludge concentration is 5g/L～50g/L, adds CaO or CaCl in the nutrient solution
2As inducing nuclear, make Ca
2+Concentration is 200mg/L～1000mg/L; The control C/N ratio reduces " NH as far as possible
3-N " concentration, COD concentration≤200mg/L, " NH
3-N " concentration≤30mg/L; Particle reconstruction stage dissolved oxygen is controlled at little oxygen level, general dissolved oxygen≤1mg/L, like dissolved oxygen at 0.05mg/L～1mg/L; The time of particle reconstruct is 4h～16h.The most important thing is in the process of particle reconstruct that karyomorphism becomes the stage, anerobes (mainly being denitrifying bacteria) will accumulate in and induce on the nuclear, therefore will control tolerance in this stage and supply with; Starting stage in this process is controlled at lower level with dissolved oxygen; Be generally 0.2mg/L,, can improve the dissolved oxygen of reaction system in the later stage along with the recovery gradually of grain pattern; But should control dissolved oxygen, make it be no more than 1mg/L.
In the inventive method,, progressively promote intensity, with " NH to the main application characteristic water quality of the screening acclimation method of reconstruct granule sludge
3-N " removal efficiency as index, detailed process and condition are content well known to those skilled in the art.
In the inventive method, have more closely knit grain pattern to granule sludge, inner anaerobic bacteria flora is difficult for the characteristic of exposure, before inducing and acclimating, adopts sonic oscillation to destroy grain pattern, or improves culture system " NH
3-N " degraded certainly of concentration initiation grain pattern, thus each Pseudomonas of forming granule sludge fully is distributed in the domestication system, improved and induced probability, and then improved domestication efficient.
That the inventive method has overcome in traditional domestication mode is too harsh to the sewage quality requirement, extreme water quality can not get the drawback of better effects; The object of mutagenesis in the domestication process simultaneously is for participating in a series of floras of nitrated-denitrification process; Rather than a kind of bacterium of being directed against of general acclimation method; Can promote the biochemical ammonia nitrogen removal efficient of total system like this, improve the whole nitrated ability of granule sludge.Present method combines the constitutional features of granule sludge; Pass through induced mechanism; On molecular level, granule sludge is tamed, transformed, thereby be that global optimization active sludge biological usefulness, enhanced granule mud provide reference and reference to aspects such as extreme water quality tolerances.
Compare with traditional method, the inventive method domestication intensity is bigger, effect is more obvious, efficient is higher.In the domestication process, fully taken into account the constructional feature of granule sludge, take off grain pattern and two links of particle reconstruct autotelic the adding, makes the mutagenic compound effect more abundant; Use simultaneously to induce and merge two kinds of methods, improved recombination probability, increased domestication intensity, make the domestication effect more obvious with protoplasma.
Description of drawings
Fig. 1 is the effect comparison of removal of ammonia and nitrogen between the granule sludge of taming among the embodiment and the control group.
Embodiment
In the inventive method, at first the activation granule sludge reaches suitable sludge concentration, inserts to contain in the waste water of certain ammonia nitrogen concentration, and adds suitable trace element assurance mikrobe normal growth; Collecting granules mud carries out carrying out mutagenesis after the grain pattern degraded then, guarantees to be in little oxygen environment in the mutagenic processes through appropriate means in the mutagenic processes; Granule sludge after the mutagenesis carried out adding after the particle reconstruct have in the sewage of characteristic condition of water quality, do the one group of blank granule sludge of mutagenesis (not through) simultaneously, through in two groups of tests to the comparison of ammonia nitrogen removal speed, confirm effect; To having the granule sludge of better digestion-denitrifying capacity, in sewage, carry out the enrichment culture use or carry out next round mutagenesis domestication with characteristic condition of water quality.
In the inventive method, the mutagenesis means that adopted comprise physical method and chemical process, the physical mutagen aspect: ultraviolet ray, X ray, gamma-rays, neutron, beta-particle, alpha-particle, microwave, infrared-ray, laser, stream of energetic electrons, ion implantation etc.; Chemical mutagen aspect: base analogue, alkylating agent, deamidization, frameshift mutagen, hydroxylation agent, metallic salt etc.
In the inventive method, require the water quality of domestication to have the sufficient nutrient material.Because nitrifier and denitrifying bacterium all are divided into two big types of autotrophy, heterotrophism, therefore will suitable nutrition supply be provided based on the nutritional need of granule sludge, and guarantee the supply of trace element.
The present invention relates generally to following link in the process to the granule sludge domestication:
(1) choose maturation or half ripe granule sludge, with phosphate buffer soln (pH7～8) washing 2～3 times, centrifugal collecting granules mud (10000rpm～30000rpm, 3min～5min); Add an amount of inorganic salt nutrient solution and (comprise trace element; Fe concentration is that 5mg/L～20mg/L, Mg concentration are that 20mg/L～100mg/L, Na concentration are that 200mg/L～1000mg/L, K concentration are 10mg/L～50mg/L), make granule sludge concentration in 10g/L～15g/L scope; Control carbon nitrogen is supplied with, and makes COD and " NH in the system
3-N " concentration is controlled at lower level (COD concentration≤300mg/L, " NH
3-N " concentration≤100mg/L).
(2) granule sludge is carried out ultrasonic pretreatment 5min～30min, or at high " NH
3-N " cultivate 2h～6h in the nutrient solution of concentration, to destroy its grain pattern, inner cenobium is fully exposed.
(3) add mutagenic compound; The mutagenic compound kind that this process can be selected is a lot; What use always in the physical mutagenesis at present is ultraviolet mutagenesis; In the chemical mutagen commonly used be base analogue with can with the material of base reaction, like nitrosoguanidine (NTG), ethyl sulfate (DES), nitroso-group ethyl carbamide (NEU) etc.Control DO (dissolved oxygen) in the mutagenic processes less than 1mg/L.
(4) after the mutagenesis reaction solution is carried out centrifugal treating, (10000rpm～30000rpm, 3min～5min), repeat 2～3 times all washes with phosphate buffered saline buffer at every turn to collect mud.Mud to collecting carries out particle reconstruct, except that the mineral nutrition composition of necessity, also need add and induce nuclear (like CaO, CaCl in the process
2Deng calcium salt), generally with Ca
2+Concentration is controlled at 200mg/L～1000mg/L.The control C/N ratio reduces " NH as far as possible
3-N " concentration, COD concentration≤200mg/L, " NH
3-N " concentration≤30mg/L.
(5) granule sludge to reconstruct screens, and the sewage of main application characteristic water quality progressively promotes intensity, with " NH
3-N " removal efficiency as index, thereby judge effect to the granule sludge domestication.
(6) for inducing the advantage granule sludge that obtains after the screening,, can consider to carry out the protoplasma fusion, thereby obtain two kinds of characteristic water quality are all had the advantage granule sludge of adaptability if obtained two kinds of granule sludges to different characteristics water quality.
Embodiment is to the granule sludge domestication process of the ammonia-nitrogen sewage that contains heavy metal ion
(1) granule sludge pre-treatment: get the ripening stage granule sludge, with phosphate buffer soln (pH is 7) washing 3 times, centrifugal collecting granules mud (10000rpm, 5min); Add an amount of nutrient solution, make sludge concentration in the 15g/L level, nutritive medium comprises metallic elements such as Fe, Mg, Na, K, in addition with methyl alcohol as carbon source, ammonium chloride as nitrogenous source, COD is 200mg/L, " NH in this culture system
3-N " be 50mg/L; The granule sludge of getting the 200mL cultivation places the 2L water-bath, carries out 5min UW (frequency 40KHz, power 600W) pre-treatment, and bath temperature is set to 35 ℃.Or through improving " NH
3-N " method of concentration carries out pre-treatment, promptly at " NH
3-N " concentration is to cultivate 2h under the 300mg/L condition, the control dissolved oxygen is 1.5mg/L in the process.
(2) granule sludge is carried out the mutagenesis domestication: this mutagenic processes is selected chemical mutagen nitrosoguanidine (NTG) for use; With pretreated granule sludge solution carry out centrifugal (10000rpm, 5min), with phosphate buffered saline buffer washing 2 times; Add to original volume with phosphate buffered saline buffer then; Again to wherein adding the nitrosoguanidine that final concentration is 50ul/ml (NTG) solution, put behind 37 ℃ of water-bath 30min centrifugal, with phosphate buffered saline buffer washing 2 times.
(3) granule sludge after the domestication being carried out particle rebuilds: adding nutrient solution according to the mud weight after centrifugal, to make sludge concentration be 15g/L, and the composition of nutrient solution and step (1) basic identical induced nuclear but also need add the CaO conduct, makes Ca
2+Concentration is 400mg/L; Reduce " NH in addition
3-N " concentration, make " NH
3-N " concentration is 30mg/L.Control dissolved oxygen≤1mg/L in the process, the initial stage dissolved oxygen is 0.2mg/L, promotes dissolved oxygen behind the 2h to 0.5mg/L, and the particle restructuring procedure carries out 8h altogether.
(4) to containing Cu
2+, Zn
2+The ionic ammonia-nitrogen sewage, the granule sludge that screening can tolerate: to containing Cu
2+, Zn
2+The ionic ammonia-nitrogen sewage makes " NH through suitably dilution
3-N " concentration is controlled at the 200mg/L level; Centrifugal (10000rpm 5min), adds in the ammonia-nitrogen sewage after the dilution with the granule sludge after rebuilding; Sludge concentration reaches the 15g/L level; While as contrast, through the removal effect of ammonia nitrogen in the two group reaction processes, is judged the effect of inducing and acclimating with one group of granule sludge of not taming.
Use this method for inducing and domesticating,, obtain reasonable test effect through simultaneous test through the inducing-screen of several cycles.Carried out 8 batches contrast experiment altogether, per 4 batches is one-period, amounts to two cycles.In each batch, select " NH
3-N " starting point concentration is the ammonia-nitrogen sewage of 200mg/L level, in actual process, the ammonia nitrogen removal speed of two kinds of granule sludges is as evaluation index.Can find out (accompanying drawing 1) through simultaneous test, be rich in Cu
2+, Zn
2+Ionic water quality has stronger restraining effect to the granule sludge that does not have domestication, and in the later stage of each test period, its ammonia nitrogen removal speed obviously descends, and the granule sludge of process mutagenesis domestication is to being rich in Cu
2+, Zn
2+Ionic water quality has had tangible tolerance, thereby in the whole test cycle, ammonia nitrogen removal speed still keeps higher level.This domestication effect is that conventional pressure selects method for domesticating to realize.
Claims (10)
1. one kind is improved the method for handling ammonia-nitrogen sewage granule sludge domestication efficient; It is characterized in that comprising following content: the activation granule sludge that selection has the ammonia nitrogen removal ability; The activation granule sludge is carried out the grain pattern degraded; Behind inducing and acclimating, collect mud and carry out particle reconstruct, the granule sludge that particle reconstruct obtains carries out flexibility screening domestication with nitrogen-containing wastewater.
2. according to the described method of claim 1, it is characterized in that: have the microorganism species that contains the ammonia nitrogen removal function in the activation granule sludge of ammonia nitrogen removal ability.
3. according to the described method of claim 1, it is characterized in that: the grain pattern degraded of activation granule sludge is adopted and is improved culture system " NH
3-N " concentration causes the method for grain pattern degraded, " NH
3-N " concentration is general>=300mg/L, dissolved oxygen>=1mg/L cultivates 2h～6h.
4. according to the described method of claim 1; It is characterized in that: the grain pattern degraded of activation granule sludge adopts the sonic oscillation method that granule sludge is carried out structural degradation; Ultrasonic frequency is 25KHz～40KHz, and ultrasonic power density is 100W/L～400W/L, and the time is 3min～15min.
5. according to the described method of claim 1, it is characterized in that: the inducing and acclimating after the grain pattern degraded adopts physics inducement domestication or chemically induced domestication.
6. according to the described method of claim 5, it is characterized in that: after inducing and acclimating, increase the protoplasma fusion process.
7. according to claim 5 or 6 described methods, it is characterized in that: keep little oxygen environment at induction period, to take into account the tolerance of nitrifying bacteria community and denitrification flora to oxygen.
8. according to the described method of claim 1, it is characterized in that: the collection mud behind the inducing and acclimating adopts centrifugal collection method or filters collection method.
9. according to the described method of claim 1, it is characterized in that: the particle reconstructing method of mud is following behind the inducing and acclimating: the mud of collecting behind the inducing and acclimating adds in the nutrient solution, and making sludge concentration is 5g/L～50g/L, adds CaO or CaCl in the nutrient solution
2As inducing nuclear, make Ca
2+Concentration is 200mg/L～1000mg/L, and the control C/N ratio reduces " NH as far as possible
3-N " concentration, COD concentration≤200mg/L, " NH
3-N " concentration≤30mg/L, particle reconstruction stage dissolved oxygen is controlled at little oxygen level, dissolved oxygen≤1mg/L, the time of particle reconstruct is 4h～16h.
10. according to the described method of claim 9, it is characterized in that: contain micro-Fe, Mg, Na and K in the nutrient solution.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825496A (en) * | 2019-03-20 | 2019-05-31 | 南京康之春生物科技有限公司 | The breeding method of water body high-efficiency nitrogen-fixing bacterium |
| CN113428975A (en) * | 2021-07-12 | 2021-09-24 | 深圳市润科环保应用技术研究有限公司 | Process for rapidly culturing aerobic granular sludge |
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| CN101746917A (en) * | 2008-12-19 | 2010-06-23 | 上海洁申实业有限公司 | Treatment method for organic industrial wastewater |
| CN101811810A (en) * | 2009-11-04 | 2010-08-25 | 北京师范大学 | Treatment box for enhancing degradation of sludge through ultrasonic waves |
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2010
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101746917A (en) * | 2008-12-19 | 2010-06-23 | 上海洁申实业有限公司 | Treatment method for organic industrial wastewater |
| CN101811810A (en) * | 2009-11-04 | 2010-08-25 | 北京师范大学 | Treatment box for enhancing degradation of sludge through ultrasonic waves |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109825496A (en) * | 2019-03-20 | 2019-05-31 | 南京康之春生物科技有限公司 | The breeding method of water body high-efficiency nitrogen-fixing bacterium |
| CN113428975A (en) * | 2021-07-12 | 2021-09-24 | 深圳市润科环保应用技术研究有限公司 | Process for rapidly culturing aerobic granular sludge |
| CN113428975B (en) * | 2021-07-12 | 2023-02-03 | 深圳市润科环保应用技术研究有限公司 | Process for quickly culturing aerobic granular sludge |
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