CN103342417B - Enrichment of low temperature-resistant heterotrophic simultaneous nitrification-denitrification microbial agent and application thereof in anoxic denitrification of sewage - Google Patents
Enrichment of low temperature-resistant heterotrophic simultaneous nitrification-denitrification microbial agent and application thereof in anoxic denitrification of sewage Download PDFInfo
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Abstract
The invention relates to enrichment of a low temperature-resistant heterotrophic nitrification-aerobic/anoxic denitrification microbial agent and application thereof in wastewater treatment under an anoxic condition. The microbial agent is capable of realizing simultaneous nitrification and denitrification in an aerobic or anoxic environment, in the presence of both ammonia nitrogen and nitrate, with sodium acetate as a unique organic carbon source under a 10 DEG C low-temperature condition; therefore, inorganic nitrogen in wastewater is transformed into gaseous nitrogen and removal of total nitrogen is realized. The low temperature-resistant microbial agent thoroughly realizes maintenance and stabilization of activity of aerobic nitrification and heterotrophic denitrification bacteria under the low-temperature condition, and also has a very high total nitrogen removal rate under an anoxic condition. Besides, the heterotrophic microbial agent grows quickly and lays a good foundation for quick amplification and actual application. When applied to practical town sewage treatment, the microbial agent is capable of efficiently removing total nitrogen in the low-temperature environment under the single anoxic condition; and therefore, the problem that a traditional treating plant hardly reaches the national class A emission standard of total nitrogen in winter is solved and the utilization potentiality of the microbial agent is huge.
Description
Technical field
The present invention relates to the application in wastewater treatment under a kind of enrichment of low temperature resistant heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum and anoxia condition.This microbial inoculum can not only be under cold condition (10 ℃) normal growth and breeding, can also under anoxia condition, by synchronous nitration and denitrification effect, manifest good total nitrogen removal effect simultaneously.
Background technology
China's body eutrophication outstanding problem.In sewage, excessive nitrogen phosphorus discharge can aggravate the eutrophication of receiving water body, the reduction of dissolved oxygen; The growth of some algae can discharge toxin, increases the weight of water quality deterioration, causes the mortality of water body biology.Existing a lot of for the research of denitrogenation dephosphorizing problem in town sewage, but still unresolved about efficiently removing the problem of total nitrogen under cold condition.
In water body, the biological removal of total nitrogen is mainly to rely on two large class denitrification microorganisms to be achieved.In nitrifying process, mainly by ammonia nitrogen being converted to the ammonia oxidizing bacteria of nitrite nitrogen and nitrite nitrogen being converted into the nitrite nitrogen oxidizing bacteria of nitre nitrogen; Denitrifying bacterium is converted into nitrite nitrogen by nitric nitrogen, and then is transformed into gaseous nitrogen.Most of denitrifying bacteria growth and breeding speed and activity under cold condition all can significantly reduce, and the effect of nitrification and denitrification effect also can run down.Because the most areas of China are in temperate zone, changes in temperature are clearly demarcated throughout the year.Therefore, in cold winter, the functional flora usefulness in a lot of sewage works is low, and ammonia nitrogen and nitre nitrogen removal effect are low, cause water outlet total nitrogen higher, are difficult to meet emission standard.Therefore, under cold condition, total nitrogen is removed the urgently to be resolved hurrily of problem.
Low temperature test chamber in prior art, in the sewage work of medium above scale, is all equipped with; therefore in the common response device of processing synthetic sewage, all can contain low temperature resistant heterotrophic nitrification aerobic/anoxic denitrification bacterium of minute quantity or trace; only because content is extremely low; be difficult to mass-producing and use, adopt usual way to be difficult to a large amount of enrichments simultaneously.The invention provides a kind of method that makes its enrichment, strengthening.The present invention carries out in accordance with the following steps: the enrichment of (1) heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum: under 10 ℃ of cold condition, adopt ammonia nitrogen and the nitre nitrogen combined sewage containing organic carbon, by aerobic and subordinate phase anoxic of first stage, tame the low temperature resistant heterotrophic nitrification aerobic denitrifying flora of enrichment; (2) under anoxic synchronous nitration and denitrification microbial inoculum low temperature, total nitrogen removal ability is measured: in enrichment process, monitor the denitrification ability under anoxia condition of heterotrophic nitrification aerobic denitrifying microbial inoculum, and capacity variation and stable process.
The acquisition of the low temperature resistant efficient anoxic denitrogenation microbial inoculum of the present invention, not only makes the total nitrogen water outlet problem of exceeding standard of sewage work in winter be solved, and also has following advantage:
(1) this heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum is very high in cold and oxygen deficient condition synchronous nitration and denitrification rate.The highest denitrification specific degradation rate can reach 32.93mg NO
3 --N/ (g SSh), far beyond the denitrification effect of low temperature resistant pure bacterium and microbial inoculum in general document; Meanwhile, under cold condition, nitrification effect is good, and in 7h, nitrogen removal rate is 93%.
(2) under 10 ℃ of conditions, nitrogen removal rate is up to 35.54mg N/ (g SSh), and total nitrogen water outlet can reach country-level A standard.When high specific degradation rate has been guaranteed follow-up practice, only need add the total nitrogen effluent quality that a small amount of microbial inoculum can reach, denitrification effect is stable simultaneously.
(3) this microbial inoculum nutritional type is heterotroph, and under cold condition, growth rapidly, can fast breeding, thereby reduces initial cost and dosage.
(4) in this microbial inoculum, flora is heterotrophic nitrification aerobic denitrifying bacterium, and microbial inoculum is easily preserved at low temperatures, is widely used in the removal of total nitrogen under anoxia condition.
(5) the present invention is applicable to ammonia nitrogen, nitre nitrogen and the total nitrogen removal of the various waste water of China's winter, has a extensive future, and has higher social benefit.
Below in conjunction with embodiment, describe the present invention.Persons of ordinary skill in the art may appreciate that embodiment is only illustrational object, scope of the present invention is not limited with specific implementation method, but is limited by the scope of claim.
Summary of the invention
The object of the present invention is to provide the application in wastewater treatment under a kind of enrichment of heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum with low temperature tolerance characteristics and anoxia condition.
Accompanying drawing explanation
Heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum anoxic acclimating 5L SBR schematic diagram under accompanying drawing 1 cold condition, wherein 1 is pump sump, and 2 is intake pump, and 3 is sbr reactor device, and 4 is gas meter, and 5 is agitator, and 6 is aeration pump, and 7 is magnetic valve.
Low temperature resistant heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum synchronous nitration and denitrification effect under anoxia condition of the good oxygen coalescence of accompanying drawing 2 250mL shaking flask
Low temperature resistant heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum synchronous nitration and denitrification effect under anoxia condition of accompanying drawing 3 5L SBR anoxic enrichments
Concrete embodiment
In embodiment, the method for monitoring and analyzing of various pollutents is with reference to < < water and effluent monitoring analytical procedure > > (the 4th edition, China Environmental Science Press, 2002).Temperature and dissolved oxygen are measured by portable dissolved-oxygen content analyser (YSI550A, USA).Sludge concentration (MLSS) and volatile suspended solid concentration (MLVSS) are according to gravimetric determination.
The various units that use in embodiment, the unified national standard that adopts.
Embodiment 1: the enrichment of low temperature resistant heterotrophic nitrification aerobic denitrifying microbial inoculum
With low temperature test chamber, processing the aerobic kind of mud taking out in the particular reactor of synthetic sewage tames and enrichment.Because function yeast is heterotrophic bacterium, thereby adopt containing organic carbon, ammonia nitrogen and nitre nitrogen composite waste and carry out enrichment, to maximize, obtain heterotrophism synchronous nitration and denitrification bacterium.The process of whole enrichment is divided into following two steps:
(1) in the shaking flask of 250mL, with the ammonia nitrogen containing organic carbon and nitre nitrogen combined sewage, cultivate enrichment, shaking speed is 150rpm, guarantees that microbial inoculum and synthetic sewage mix.This stage, in shaking flask, dissolved oxygen state was aerobic in order to guarantee the rapid amplifying of heterotrophic nitrification aerobic denitrifying microbial inoculum.Each cycle 12h, discharge rate approximately 90%;
(2) in the SBR of 5L, to synthesize sewage containing the high nitre nitrogen of organic carbon, cultivate enrichment, aeration rate is 0.2L/min, and DO is 0.8-1.0mg/L.This stage, dissolved oxygen state was from the aerobic anoxic that becomes in order to promote microbial inoculum in the synchronous nitration and denitrification ability of anoxia condition.Aeration time 22h, each cycle 24h, discharge rate 90%.In order to mix in assurance system, add mechanical stirrer.
The design parameter in two stages of enrichment is as shown in table 1.
Two stage effects of the cold-resistant heterotrophic denitrifying Bacteria enrichment of table 1
A each cycle nitre nitrogen is degradable, and water outlet nitre nitrogen concentration is 0.
In order to guarantee initial microbial inoculum energy rapid amplifying, it is identical that enrichment environment mud of the same race takes out reactor dissolved oxygen state, is good oxygen condition.When enrichment after more heterotrophic nitrification aerobic denitrifying bacterium, at stages 2 regulation system dissolved oxygen, to anoxic condition, further tame and improve the total nitrogen removal effect of heterotrophic nitrification aerobic denitrifying microbial inoculum under anoxia condition.
From stage 1 to the stage 2, the synchronous nitration and denitrification performance of low temperature sludge grows steadily, and two enrichment stages can all remove nitre nitrogen (in system, the end of term in week is not containing nitrite nitrogen) in one-period, and the nitrification of microbial inoculum also has larger lifting simultaneously.The gross dry weight of microbial inoculum increases obviously, and amplification has reached 800%, has reached the object of efficiently concentrating.
The mensuration of embodiment 2:250mL shaking flask good oxygen coalescence low temperature-resistant strains agent denitrification ability under anoxia condition
The cold-resistant heterotrophic nitrification aerobic denitrifying microbial inoculum of getting a certain amount of first stage enrichment is poured in 1L beaker, and initial MLSS is about 2500mg/L, is positioned on magnetic stirring apparatus.Add containing ammonia nitrogen and the nitre nitrogen combined sewage of organic carbon the denitrification ability under its cold condition is measured.Aeration control is 0.1L/min, makes initial DO be about 0.8-1.0mg/L.Every 1h, sample 8mL in 10mL centrifuge tube, and measure intrasystem DO, temperature and pH value.Liquid sample is centrifugal 5min under 8000rpm, gets supernatant liquor and measures NH
4-N, NO
2-N, NH
3-N, DO and temperature.Intrasystem pH is controlled at 7.0-8.0.
Experimental result as shown in Figure 2.As seen from the figure, under cold condition, in system, the concentration of nitre nitrogen reduces rapidly from initial 130mg/L, and eliminates completely after 6h, and denitrification effect is remarkable.Aspect nitrification effect, ammonia nitrogen concentration has certain removal in 6h.Due to the mainly enrichment under aerobic condition of this stage microbial inoculum, at sudden transition, be that anaerobic environment is carried out nitrification ability while measuring, there is certain nitrification effect.Meanwhile, nitrite nitrogen concentration is the too large variation of nothing in whole process, and reduces to gradually 0 in latter stage.Nitre nitrogen transformation is that the ratio of gaseous nitrogen reaches 100%, and nitrogen removal rate is 81% simultaneously.By calculating, the ratio denitrification rate of nitre nitrogen is 10.41mg N/ (g SSh), and ammonia nitrogen removal effect embodies to some extent.Explanation thus, under cold condition (envrionment temperature is 10 ℃), this microbial inoculum resistance to low temperature is remarkable, and under anoxia condition, denitrification effect is excellent, and nitrification effect represents to some extent.In order to realize microbial inoculum in the utilization of actual sewage treatment plant, under its anoxia condition, nitrated and total nitrogen removal efficiency needs further to optimize and promote.
The mensuration of the embodiment 3:5L SBR low temperature resistant microbial inoculum of anoxic enrichment denitrification ability under anoxia condition
In order to realize the rapid amplifying of heterotrophic nitrification aerobic denitrifying mud, the enrichment environment in stage 1 has been oxygen condition.In order to promote the anoxic synchronous nitration and denitrification ability of low temperature resistant microbial inoculum, in the stage 2, the enrichment environment of system is adjusted into anoxic.After anoxic enrichment after a while, carried out denitrification ability under cold and oxygen deficient condition and measured.
The cold-resistant heterotrophic nitrification aerobic denitrifying microbial inoculum of getting a certain amount of subordinate phase enrichment is poured in 1L beaker, and initial MLSS is about 2500mg/L, is positioned on magnetic stirring apparatus.Add containing ammonia nitrogen and the nitre nitrogen combined sewage of organic carbon the denitrification ability under its cold and oxygen deficient condition is measured.Aeration control is 0.1L/min, makes initial DO be about 0.8-1mg/L.Every 1h, sample 8mL in 10mL centrifuge tube, and measure intrasystem DO, temperature and pH value.Liquid sample is centrifugal 5min under 8000rpm, gets supernatant liquor and measures NH
4-N, NO
2-N, NH
3-N, DO and temperature.Intrasystem pH is controlled at 7.0-8.0.
Experimental result as shown in Figure 3.As seen from the figure, under cold and oxygen deficient condition, in system, the concentration of nitre nitrogen reduces rapidly from initial 168mg/L, and eliminates completely after 2h, and denitrification effect far surpasses the first stage.The peak value of nitrite nitrogen concentration appears at 1st hour, and reduces to 0 at 2nd hour.Meanwhile, nitrification ability also promotes steadily under anoxia condition, and ammonia nitrogen concentration drops to 13mg/L from 40mg/L in 7h.Therefore activity and the ability of low temperature resistant heterotrophic nitrification aerobic denitrifying bacterium in microbial inoculum is all significantly enhanced.By calculating, the ratio that nitre nitrogen transformation is gaseous nitrogen reaches 100%, and nitrogen removal rate is 93%.In 7h, system total nitrogen is reduced to 14mg/L from 213mg/L, has reached national sewage one-level A emission standard.Total nitrogen specific degradation rate is 35.54mg N/ (g SSh), in synchronous nitration and denitrification process without the accumulation of nitre nitrogen and nitrite nitrogen.Explanation thus, under cold condition (envrionment temperature is 10 ℃), this microbial inoculum is after the anoxic enrichment culture through subordinate phase, and nitrification ability is improved, and adverse effect speed is maintained and also improves a lot simultaneously, and practice is worth and further shows.
To sum up, this low temperature resistant heterotrophic nitrification aerobic denitrifying microbial inoculum is after the acclimating of subordinate phase, and under anoxia condition, synchronous nitration and denitrification performance promotes steadily.The microbial inoculum of subordinate phase can perfect have been realized efficient removal of removing total nitrogen in sewage under cold condition.The dry weight of microbial inoculum is also greatly improved simultaneously, has reached the object of fast enriching, has facilitated follow-up utilization in actual motion.Microbial inoculum after subordinate phase enrichment optimization has represented efficient anoxic removing total nitrogen characteristic under cold condition, can produce larger economic worth.Low aeration rate can be saved the part energy simultaneously, environmentally friendly.
Claims (3)
1. the enriching method of low temperature resistant heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum, it is characterized in that selecting laboratory heterotrophic nitrification aerobic denitrifying kind mud to carry out enrichment, be specially: (1) cultivates enrichment with the ammonia nitrogen containing organic carbon and nitre nitrogen combined sewage under aerobic condition in the shaking flask of 250mL, shaking speed 150rpm, each cycle 12h, discharge rate is 90%; (2) under anoxia condition in the SBR of 5L with containing ammonia nitrogen and the further acclimating of nitre nitrogen combined sewage of organic carbon, aeration rate is 0.2L/min, aeration time 22h, each cycle 24h, discharge rate 50%, obtains heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum of low temperature tolerance characteristics; The full stage of enrichment all realizes in 10 ℃ of low hot houses of temperature control; Ammonia nitrogen and nitre nitrogen combined sewage containing organic carbon source used consists of: 2.73g/L sodium acetate, 0.153g/L NH
4cl, 1g/L KNO
3, 0.15g/L KH
2pO
4, 0.1g/LMgSO
4.7H
2o, 0.05g/L CaCl
2.2H
2o, 0.006g/L FeSO
4.7H
2o, 1g/L NaHCO
3, surplus is water.
2. enriching method according to claim 1, while it is characterized in that anoxic enrichment, synchronous nitration and denitrification performance measurement, in 5L SBR system, the scope of dissolved oxygen is 0.8-1.0mg/L,, the scope of pH is 7.0-8.0.
3. the application in wastewater treatment according to the low temperature resistant heterotrophic nitrification aerobic/anoxic denitrification microbial inoculum described in claim 1, it is characterized in that synchronous ammonia nitrogen and the nitre nitrogen of removing in waste water under anoxia condition, initial MLSS is that 2500mg/L, pH are controlled at 7.0-8.0,10 ℃, to mixing the maximum TN removel rate of synthetic sewage described in claim 1, are 35.54mg N/ (g SSh) during dissolved oxygen 0.8-1.0mg/L, in denitrification process without the accumulation of nitre nitrogen and nitrite nitrogen.
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| CN104673738B (en) * | 2015-02-13 | 2017-10-24 | 中蓝连海设计研究院 | A kind of domestication of heterotrophic nitrification aerobic denitrifying bacteria and screening technique |
| CN109553247B (en) * | 2018-12-28 | 2021-08-31 | 中国人民大学 | Method for realizing anaerobic ammonia oxidation based on heterotrophic nitrification process |
| CN110745966B (en) * | 2019-11-06 | 2021-12-17 | 南京大学 | Binary system of quorum sensing-aerobic denitrifying bacteria for enhancing biomembrane denitrification under low-temperature condition, construction method and application |
| CN111675426B (en) * | 2020-05-26 | 2022-11-04 | 杭州电子科技大学 | Polyurethane sewage treatment system and method applying composite microbial inoculum |
| CN112093974B (en) * | 2020-08-05 | 2022-12-27 | 杭州电子科技大学 | Efficient biochemical treatment system and method for phosphorus-containing latex wastewater by using composite microbial inoculum |
| CN112174805B (en) * | 2020-11-10 | 2023-02-03 | 杭州电化集团有限公司 | Production method of sodium acetate capable of not crystallizing at low temperature |
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