CN103145233B - Method for achieving fast cultivation of shortcut nitrifying granule sludge - Google Patents
Method for achieving fast cultivation of shortcut nitrifying granule sludge Download PDFInfo
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- CN103145233B CN103145233B CN201310075348.2A CN201310075348A CN103145233B CN 103145233 B CN103145233 B CN 103145233B CN 201310075348 A CN201310075348 A CN 201310075348A CN 103145233 B CN103145233 B CN 103145233B
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Abstract
The invention belongs to the fields of treatment and regeneration of municipal sewage, and particularly relates to a method for rapidly cultivating aerobic granular sludge with good shortcut nitrifying performance. A sequencing batch reactor (SBR) is operated by fixed aeration time and aeration rate by gradually shortening the settling time; and the shortcut nitrifying granule sludge is rapidly cultivated. The granulation of common floc sludge is successfully achieved within 20 days via three stages of overdue cultivation, granule forming and granule maturation; the nitrite accumulation rate (NAR) achieves 80% within 80 days; the mean grain size is greater than 800 microns; the removal rate of the NH4<+>-N is close to 100%; and the removal rate of the chemical oxygen demand (COD) is 94%.
Description
Technical field
The invention belongs to city domestic sewage and process and the regeneration field, be specifically related to a kind of aerobic particle mud fast culture process with short distance nitration performance.
Background technology
Along with making rapid progress of science and technology, the environmental problem that the water pollution of take is representative becomes increasingly conspicuous, and in waste water, the ammonia nitrogen removal problem has caused numerous scholars' concern.Sewage disposal technology develops into and today occurred a lot for the treatment of processs, and wherein bio-denitrification technology becomes the study hotspot in this field.
Short-cut denitrification is with respect to omnidistance denitrogenation, the nitrated stage can be saved 25% aeration rate, the denitrification stage can reduce by 40% organic carbon source, and the short-cut nitrification and denitrification biological denitrification process have basicity consumption less, the characteristics such as the reaction times is short and sludge yield is low, be considered to a kind of continuable sewage water denitrification new technology, short-cut denitrification gets the attention in recent years.Short-cut denitrification is achieved the key with stable maintenance, is that nitrifying process is ended to NO
2 --N the stage, i.e. short distance nitration, it is significant that the control strategy of realizing short distance nitration is widely used in engineering practice for the short distance nitration denitrification process.
The nineties in 20th century, Aerobic Granular Sludge Technology occurs first as a kind of brand-new dirty water living creature processing technique, aerobic granular be considered to one by flco mud the gradual change process to compact particle.With cotton-shaped active sludge, compare, granule sludge has that settling property is outstanding, sludge density is large, physical strength is high, biomass is many and the advantage such as the organic loading holding capacity is stronger.But the anaerobic grain sludge technology is longer start time, operating temperature is higher, stable not and the efficiency aspect the removal of nitrogen phosphorus is lower when processing underload sewage, this has just promoted the research of people to Aerobic Granular Sludge Technology, and obtained a series of achievement in research, promoted the development of aerobic particle mud bio-denitrification technology.Nitrifying granular activated sludge is that a large amount of nitrobacterias assemble the particulate state microbial aggregate that growth forms, the well-regulated profile of tool, closely knit structure, and good sedimentation function, and ammonia nitrogen removal frank is high, can be used for processing high-concentration ammonia nitrogenous wastewater.
It is to obtain the new way of stablizing short distance nitration that Shortened nitrification process for biological nitrogen removal combines with aerobic particle mud technique.The nitrosated granular sludge that also has some other heterotrophic bacterium to form by ammonia oxidation bacteria (AOB) and NOB (NOB) has certain stability and can adapt to some changeable envrionment conditionss.
Summary of the invention
The object of the invention is to provide a kind of method that can realize short distance nitration granule sludge fast culture.
At 20～30 ℃ of temperature, the draining ratio is 50～65%, take the seed sludge that excess sludge of municipal sewage plant is system, the sedimentation time of usining is pressed as selecting, adopt the method that shortens gradually sedimentation time, utilize manual simulation's sanitary sewage, cultivate aerobic particle mud; Use the fixedly mode of aeration time and aeration rate to move sequencing batch reactor (SBR), realize short distance nitration, finally turn out the aerobic particle mud with short distance nitration performance.
Concrete steps are as follows:
Step 1: initial-stage culture stage
Adopt simulated domestic wastewater to start reactor, controlling COD concentration is 350～450mg/L, NH
4 +-N concentration is 80～100mg/L, and seed sludge MLSS is 3500～4500mg/L, and SVI is 80～90mL/g; System is moved 3 cycles every day, and each cycle 7.5～8h, comprise into water 3～6min, aerobic aeration 7.2～7.5h, and sedimentation time is made as 12～16min, draining 3～6min, be idle mixing time remaining time, wherein aeration rate is 0.9～1.2L/h; In this stage, when intrasystem mud median size is more than 1.5 times of seed sludge median size, and the SVI value of mud surpasses continuously 4 cycles in downtrending, thinks that pelletising process has occurred system, enters the particle formation stages.
Step 2: particle formation stages
The water inlet of reactor is still simulated domestic wastewater, and controlling COD concentration is 350～450mg/L, NH
4 +-N concentration is 80～100mg/L, and seed sludge MLSS is 3500～4500mg/L, and SVI is 80～90mL/g; System is moved 3 cycles every day, and each cycle 7.5～8h, comprise into water 3～6min, aerobic aeration 7.2～7.5h, and sedimentation time shortens to 3～8min, draining 3～6min, be idle mixing time remaining time, wherein aeration rate is 0.9～1.2L/h; In this stage, in system, the mud median size is more than 4.5 times of seed sludge median size, and the SVI value of mud is on a declining curve over 4 cycles continuously, thinks that system enters the particle stage of maturity.
Step 3: particle stage of maturity
The water inlet of reactor is still simulated domestic wastewater, and controlling COD concentration is 350～450mg/L, and NH4+-N concentration is 80～100mg/L, and seed sludge MLSS is 3500～4500mg/L, and SVI is 80～90mL/g; System is moved 3 cycles every day, and each cycle 7.5～8h, comprise into water 3～6min, aerobic aeration 7.2～7.5h, and sedimentation time shortens to 1.5～3min, draining 3～6min, be idle mixing time remaining time, wherein aeration rate is 0.9～1.2L/h; In this stage, when water outlet NH4+-N value is less than 1mg/L, and the NAR value is greater than 80%, thinks in reactor and formed stable short distance nitration; Meanwhile, in system, the mud median size is more than 7 times of seed sludge median size, and the SVI value of mud surpasses continuously 4 cycles in downtrending or remains unchanged, and it is in rising trend that the MLSS value surpasses 4 cycles continuously, think that the cultivation of short distance nitration granule sludge is ripe.
The present invention has following beneficial effect:
1) the present invention, by initial-stage culture, particle formation, the ripe three phases of particle, has successfully realized the granulating of common flco mud in 20d, and median size increases more than 4.5 times.Be no more than 80d from being inoculated into the aerobic particle mud maturation, median size increases more than 7 times, NH
4 +-N clearance approaches 100%, COD clearance and surpasses 90%, NAR value over 80%.
2) the present invention presses as the selection of system by shortening gradually sedimentation time, contributes to retain the mud that settling property is good and eluriate the poor flco mud of settleability, impels mud to assemble and is convenient to granulating, accelerates granulating speed.In order to tackle shorter sedimentation time, in mud, inanimate matter content increases gradually, and the microbes selectivity accumulates some metal ions increases autologous density, thereby improves degree of compactness and the settling property of mud.
3) the present invention adopts the fixedly mode of aeration time and aeration rate to move sequencing batch reactor (SBR), due to aeration time and aeration rate constant, and the mud in reactor causes the deficiency of nitrobacteria quantity in continuous elutriation, thereby cause the incomplete of nitration reaction, its effect is equivalent to NH
4 +-N is complete oxidation and finish in advance aeration not, thereby forms NO
2 -the accumulation of-N.The long-term nitrated activity of NOB bacterium that not exclusively makes is suppressed, and the particle form of granule sludge is conducive to realize adhering to and enrichment of AOB bacterium simultaneously, and AOB becomes the dominant bacteria in nitrobacteria gradually, thereby has formed stable short distance nitration in reactor.
The accompanying drawing explanation
Fig. 1 is sludge characteristics change curve in experimentation of the present invention, the test latter stage, mud MLSS reaches 6440mg/L, SVI is 21mL/g, settling property be improved significantly.
Fig. 2 is Nitrification Characteristics change curve in experimentation of the present invention, since 66d water outlet NH
4 +-N concentration is lower than 0.5mg/L, NH
4 +-N clearance approaches 100%, NAR value and grows steadily, and reaches 83% latter stage.
Fig. 3 (a) is the outward appearance scanning electron microscope (SEM) photograph that adopts the short distance nitration granule sludge of the inventive method cultivation.
Fig. 3 (b) is the inner scanning Electronic Speculum figure that adopts the short distance nitration granule sludge of the inventive method cultivation.
Below in conjunction with embodiment, the invention will be further described, but protection scope of the present invention is not limited to this.
Embodiment
Embodiment 1:
Adopt the sbr reactor device, high 50cm, diameter 23.5cm, useful volume is 21L, by synthetic glass, is made, and the vertical direction on reactor wall arranges the thief hole that row's spacing is 10cm, and bottom is provided with shore pipe, and the draining ratio is 60%.Using the rubber microporous aeration disc as aerator, adopt blast aeration, spinner-type flowmeter is controlled aeration rate, makes it constant in 1L/h.Control the temperature in reactor by temperature controller, remain on 25～28 ℃.The operation of sbr reactor device realizes the automatic control to reaction process by program timer, moves 3 cycles every day, and each cycle is 8h.Water inlet, for artificial simulated domestic wastewater, be take sodium acetate as organic carbon source, and corresponding COD concentration is 400mg/L, NH
4 +-N concentration is 80mg/L.The MLSS of seed sludge is 4030mg/L, and SVI is 89mL/g, and median size is 106.56 μ m.
In the initial-stage culture stage, each cycle comprises 5min water inlet, 7.5h aerobic aeration, 15min precipitation, 5min draining and 5min idle mixing time.At the initial stage, the higher and aeration time of seed sludge MLSS and aeration rate abundance make NH
4 +-N, almost by whole oxidations, goes out water concentration all lower than 2mg/L.Move to 6d, nitrite accumulation rate (NAR) is increased to 20%, because a large amount of poor mud of settling property is eluriated away by system, mud MLSS value is reduced, but the SVI value is always in downtrending, and the median size of mud is 216.52 μ m, and system has entered the particle formation stages.
The particle formation stages, since 7d, each cycle comprises 5min water inlet, 7.5h aerobic aeration, 3min precipitation, 5min draining and 17min idle mixing time.Move to 20d, because part mud is gone out by elutriation, in system, AOB bacterium quantity reduces, to such an extent as to water outlet NH
4 +-N concentration slightly increases, but lower than 5mg/L, simultaneity factor NAR value rises to more than 30%, because the flco mud in reactor exists in a large number, causes sludge settling not to be significantly improved, although mud SVI value continues to reduce, but still, more than maintaining 70mL/g, the mud color has been become light yellow by tawny, and there is the granule sludge of fine sand shape to occur, median size reaches 480.74 μ m, and system has entered the stage of maturity.
In the particle stage of maturity, since 21d, each cycle comprises 5min water inlet, 7.5h aerobic aeration, 2min precipitation, 5min draining and 18min idle mixing time.The mud that it is poor that shorter sedimentation time causes settleability flows out with water outlet, and MLSS is on a declining curve.At 47d, MLSS drops to 1020mg/L, because aeration time and aeration rate remain unchanged, to such an extent as to water outlet NH
4 +-N concentration reaches 17.38mg/L.Along with the increase of incubation time, MLSS constantly increases, water outlet NH
4 +-N concentration constantly descends.At 66d, MLSS reaches 3000mg/L left and right, water outlet NH
4 +-N is again lower than 2mg/L.After this further reduce, to 80d, water outlet NH
4 +-N is lower than 0.5mg/L, NH
4 +-N clearance approaches 100%, and now the NAR value has approached 80%, and in reactor, the mud median size is 856.56 μ m, and the short distance nitration granule sludge is cultivated maturation, and experiment NAR value in latter stage reaches 83%, has formed stable short distance nitration in system.
In 80d, the short distance nitration granule sludge is cultivated maturation, and intrasystem pollution substance is effectively removed, and the COD clearance reaches 94%, NO
3 --N clearance reaches 83%, NH
4 +-N clearance approaches 100%.
Claims (1)
1. a method that realizes short distance nitration granule sludge fast culture, it is characterized in that: at 20～30 ℃ of temperature, the draining ratio is 50～65%, take the seed sludge that excess sludge of municipal sewage plant is system, the operation sequencing batch reactor, hereinafter to be referred as reactor;
1) the initial-stage culture stage, adopt simulated domestic wastewater to start reactor, and controlling COD concentration is 350～450mg/L, NH
4 +-N concentration is 80～100mg/L, and seed sludge MLSS is 3500～4500mg/L, and SVI is 80～90mL/g; System is moved 3 cycles every day, and each cycle 7.5～8h, comprise into water 3～6min, aerobic aeration 7.2～7.5h, and sedimentation time is made as 12～16min, draining 3～6min, be idle mixing time remaining time, wherein aeration rate is 0.9～1.2L/h; In this stage, when intrasystem mud median size is more than 1.5 times of seed sludge median size, and the SVI value of mud surpasses continuously 4 cycles in downtrending, thinks that pelletising process has occurred system, enters the particle formation stages;
2) particle formation stages, the water inlet of reactor is still simulated domestic wastewater, controlling COD concentration is 350～450mg/L, NH
4 +-N concentration is 80～100mg/L, and seed sludge MLSS is 3500～4500mg/L, and SVI is 80～90mL/g; System is moved 3 cycles every day, and each cycle 7.5～8h, comprise into water 3～6min, aerobic aeration 7.2～7.5h, and sedimentation time shortens to 3～8min, draining 3～6min, be idle mixing time remaining time, wherein aeration rate is 0.9～1.2L/h; In this stage, in system, the mud median size is more than 4.5 times of seed sludge median size, and the SVI value of mud is on a declining curve over 4 cycles continuously, thinks that system enters the particle stage of maturity;
3) the particle stage of maturity, the water inlet of reactor is still simulated domestic wastewater, and controlling COD concentration is 350～450mg/L, NH
4 +-N concentration is 80～100mg/L, and seed sludge MLSS is 3500～4500mg/L, and SVI is 80～90mL/g; System is moved 3 cycles every day, and each cycle 7.5～8h, comprise into water 3～6min, aerobic aeration 7.2～7.5h, and sedimentation time shortens to 1.5～3min, draining 3～6min, be idle mixing time remaining time, wherein aeration rate is 0.9～1.2L/h; This stage, as water outlet NH
4 +-N value is less than 1mg/L, and the NAR value is greater than 80%, thinks in reactor and has formed stable short distance nitration; Meanwhile, in system, the mud median size is more than 7 times of seed sludge median size, and the SVI value of mud surpasses continuously 4 cycles in downtrending or remains unchanged, and it is in rising trend that the MLSS value surpasses 4 cycles continuously, think that the cultivation of short distance nitration granule sludge is ripe.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103601287B (en) * | 2013-11-17 | 2016-03-09 | 北京工业大学 | A kind of cultural method of aerobic nitrosated granular sludge |
| CN103723821B (en) * | 2013-12-29 | 2015-06-03 | 北京工业大学 | Method for rapid mutagenesis of autotrophic nitrosation sludge from complete nitrifying sludge |
| CN106830301A (en) * | 2017-01-13 | 2017-06-13 | 深圳市环境科学研究院 | A kind of method that aerobic particle mud is cultivated in sbr reactor post |
| CN108358305B (en) * | 2018-02-01 | 2020-12-11 | 北京化工大学 | Aerobic granular sludge double-chamber culture device and rapid culture method |
| CN108996681B (en) * | 2018-09-30 | 2021-12-07 | 云南天朗环境科技有限公司 | Anaerobic granular sludge and culture method and application thereof |
| CN112010424B (en) * | 2019-05-31 | 2023-02-28 | 中国石油天然气集团有限公司 | Partial nitrosation reaction regulation and control method and device |
| CN113603210B (en) * | 2021-08-12 | 2023-04-07 | 国河环境研究院(南京)有限公司 | Domestication method of high-density short-cut denitrification granular sludge |
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