CN1944285A - Use of rare-earth element in cultivating aerobic particle mud and controlling mud expansion - Google Patents
Use of rare-earth element in cultivating aerobic particle mud and controlling mud expansion Download PDFInfo
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- CN1944285A CN1944285A CNA2006100695025A CN200610069502A CN1944285A CN 1944285 A CN1944285 A CN 1944285A CN A2006100695025 A CNA2006100695025 A CN A2006100695025A CN 200610069502 A CN200610069502 A CN 200610069502A CN 1944285 A CN1944285 A CN 1944285A
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Abstract
The present invention discloses the application of RE element in cultivating aerobic sludge particle and controlling sludge expansion. During cultivating aerobic sludge particle, RE element solution of concentration below 30 mg/L is thrown into the biochemical reactor once every three days. Thus cultivated aerobic sludge particle with RE element has short forming period, large particle, low water content, high deposition rate, low SVI, high COD load and other advantages.
Description
Technical field
The present invention relates to fields such as the biological effect of rare earth and environmental microorganism, relate in particular to and utilize rare earth element unique biological characteristic in microorganism, be applied to the fast culture of aerobic particle mud and the control of sludge bulking.
Background technology
1. rare earth
China is a rare earth resources big country, no matter is the rare-earth mineral product, or total resources and industrial reserves all occupy first place in the world.The application of rare earth is increasingly extensive, and known rare earth is at metallurgy industry, and petrochemical complex, agricultural, medicine and other fields all are applied.The bioactivity research of rare earth element was 20 beginnings of the century, and rare earth element has biological action widely to microorganism as can be known from a large amount of documents
(1) rare earth element is to the biological impact of microorganism
The light rare earths of suitable concentration the early stage has the minimal irritation effect to microorganism growth in growth, but along with the prolongation of incubation time, promoter action weakens.Improve the concentration of rare earth element, microbial growth generation restraining effect is shown as between the bacterium colony nascent compare according to delay, colony diameter reduces.After concentration was greater than certain value, microorganism growth was in halted state substantially, simultaneously the meta-bolites of microorganism and the secretion capacity of extracellular enzyme was had certain influence.Variation has also taken place in the total amino acid content of somatic cells, amino acid composition.
(2) the biochemical action mechanism of rare earth element pair cell
Rare earth mainly comprises following three aspects to biomembranous influence: the first, and translocator or phosphatide interact on rare earth and the film, and translocator activity or membrane channel size are changed, thereby improve film active or passive transportcapacity; The second, rare earth can interact with the film metabolism protein, influences biomembranous energy metabolism; The 3rd, rare earth can interact with membrane receptor protein, participates in the transmission of cell information.
(3) interaction mechanism of rare earth ion and enzyme molecule
Rare earth element has the allosteric activation effect to enzyme when concentration is low, and concentration is inhibited to enzyme when high.Action site is the allosteric site beyond the activity mostly, and rare earth ion is with after the allosteric site of enzyme combines, and makes the conformational change of enzyme and influences the activity of enzyme.
Along with rare earth element to the microorganism biological functionally active; pair cell stride the film behavioral mechanism; deepening continuously of the biochemical action mechanism of pair cell and the research of the interaction mechanism of enzyme molecule, its applied research in fields such as environment protection, microorganisms is also more and more active.
2. aerobic particle mud
Aerobic particle mud is the self coagulation phenomenon of microorganism under aerobic environment, self coagulation is in the biological treatment system, microorganism is under suitable envrionment conditions, and polymerization forms a kind of density mutually, volume ratio is bigger, the active and all reasonable symbiote particulate of mass transfer condition phenomenon.Chinese scholars is being done a large amount of elaborations aspect the research of aerobic particle mud; 1991-1998 is the primary stage of research aerobic particle mud; begin to recognize that under aerobic environment mud also can granulating; this stage has just been reported the phenomenon of the appearance of aerobic particle mud, does not carry out deep research.And the granulating that enters mud under subordinate phase (1999-2000) aerobic environment begins to cause people's attention, and during this, the aerobic sludge granulating is reported that by many scholars the research focus mainly is the primary condition that aerobic particle mud emerges.From 2001 so far, along with the development of aerobic granular technology, culture condition, influence factor that the various countries scholar begins aerobic particle mud have been carried out deep research.
Increase along with China's population, it is precious that land resources more shows, aerobic treatment method floor spaces such as common activated sludge process and biomembrance process are big, the development of restriction water treatment field, and the aerobic particle mud method is relied on SBR technology, have the good biological activity that floor space is little, settling property is good, biomass is high and degrade high concentrated organic wastewater under high volumetric loading condition, thereby application prospect is tempting and wide.
Summary of the invention
The objective of the invention is to rare earth element is applied to aerobic particle mud, provide a kind of safe and effective novel method that promotes that aerobic particle mud forms and controls the appearance of sludge bulking phenomenon, i.e. the application of rare earth element in aerobic particle mud cultivation and control sludge bulking.This method will help the industrialization of oxygen granule sludge technology and the development of sludge bulking Prevention Technique.
The application of rare earth element in aerobic particle mud cultivation and control sludge bulking.
Wherein: described rare earth element is a solubility salt rare-earth compound.
Wherein: described solubility salt rare-earth compound is a kind of in lanthanum nitrate, cerous nitrate, the neodymium nitrate preferably.
The application method of above-mentioned rare earth element is: cultivate startup from aerobic particle mud, added the rare earth element solution that concentration is no more than 30mg/L every three days in biochemical reactor.
Wherein: the application method of preferred rare earth element is: cultivate startup from aerobic particle mud, added the rare earth element solution that concentration is 30mg/L every three days in biochemical reactor.
Come technical scheme of the present invention and technique effect are described further below by concrete test:
Being divided into two portions carries out:
1. in the Erlenmeyer flask of six 250ml, add altogether 100ml of active sludge and artificial sewage respectively, add an amount of rare earth stock solution then, make that rare earth element concentration is respectively 0.0,10.0,20.0,30.0,50.0,70.0mg/L; After Erlenmeyer flask put into constant temperature (25 ℃) shaking table and cultivate 24h, observe apparent symptom of mud and record, the sampling back with microscopic examination, take pictures, and measure mud total amount and oxygen consumption rate in each Erlenmeyer flask.
By above experimental data as can be known the rare earth of different concns the activity of active sludge is all had in various degree inhibition, but find that simultaneously rare earth can promote polymer outside the microorganism secretion born of the same parents under the concentration about 30mg/L, make the germs collect growth, and can promote microbial growth comparatively fast, be feasible so choose the rare earth of 30mg/L left and right sides concentration as microorganism promotor.
2. on the basis of first part research, be seed sludge with common cotton-shaped active sludge, utilize three stages of under the aerobic aeration condition, moving in two sbr reactor devices (being respectively SBR I and SBR II) to cultivate aerobic particle mud, observe the variation of mud granule form and structure simultaneously, the variation of monitoring MLSS, VSS, VSS/MLSS, SVI, COD and the outer polymer component of born of the same parents.From reactor start-up, added the rare earth element solution for preparing in advance every three days to SBR I, making the interior rare earth element concentration of SBR I reactor is 30mg/L, SBR II reaction column does not as a comparison add rare earth element.
Form period at aerobic particle mud as can be known from data, the MLSS value of SBR I reactor is a (see figure 1) greater than the SBRII reactor in the most of the time, illustrates that the interpolation rare earth element has obvious effects to the increase of sludge quantity; Fig. 2 is the change curve of VSS/MLSS value in the granule sludge forming process, as seen from the figure, the VSS/MLSS value of seed sludge is 0.82, cultivation through 28 days, the VSS/MLSS value of two sbr reactor devices is respectively 0.86 and 0.84, and the content of organic substance has effect comparatively significantly to rare earth element in the active sludge to improving as can be seen; SBR ICOD clearance is basicly stable between 85-95 as can be seen from Figure 3, and the clearance of SBR II is basicly stable between 80-90, and SBR I is than the COD clearance height of SBR II; From Fig. 4 the aerobic particle mud forming process the SVI change curve as can be known the SVI value of SBR I reactor the most of the time less than SBR II reactor, substantially remain between the 30-80, even SVI reaches 166ml/g in the SBRII reactor, when slight sludge bulking takes place, the SVI value is also only about 80 in the SBR I reactor, the hyphomycetic propagation of rare earth may command is described, keeps thread fungus and zoogloea bacterial equilibrium, to improving and keeping activated sludge settling property that obvious effects is arranged.From two reactors that Fig. 5 represents in the granule sludge forming process outside the born of the same parents variation of polymer component concentration as can be known, two reactors Protein content in the particulate forming process all has the trend of increase; Polysaccharide slightly increases after the particle formation initial stage decreases, and overall rangeability is less.Protein and polysaccharide ratio are increased to 4.88 from 2.29 in the SBR I reactor, and SBR II reactor is increased to 4.15 from 2.29.Along with protein and polysaccharide ratio increase, then the Sludge Surface negative charge reduces, hydrophobicity increases, and helps the formation of aerobic particle mud and stable, and visible rare earth will influence the formation of aerobic particle mud by the influence to the outer polymer of born of the same parents.The aerobic particle mud of rare earth element cultivation and the aerobic particle mud that common law is cultivated are adopted in contrast, can find that the former is superior than the latter aspect particulate density, water ratio, subsidence rate, SVI, COD sludge loading.
Description of drawings
The MLSS change curve of Fig. 1 two sbr reactor devices in the aerobic particle mud forming process,
Fig. 2 is the change curve of VSS/MLSS value in the aerobic particle mud forming process,
Fig. 3 is a COD change curve in the aerobic particle mud forming process,
Fig. 4 is the SVI change curve in the aerobic particle mud forming process,
Fig. 5 is the outer polymer component concentration change curves of born of the same parents.
Embodiment
With concrete embodiment application of the present invention is described further below:
This example is to utilize rare earth element to cultivate the concrete application of aerobic particle mud, from reactor start-up, is total to 28d till the interior aerobic particle mud of reactor forms.Two reactors move simultaneously, and wherein SBR I reactor start-up begins to add a rare earth element (lanthanum nitrate) solution in per 3 days, and making the concentration of rare earth element in the reactor is 30mg/L.Whole process is divided into three operation phase.
Operation phase one
Active floc sludge continues aeration 4 days with the beer waste water of dilution before the inoculation, makes mud obtain preliminary domestication, and active floc sludge is that typical filamentary texture connects, and color is tawny, and is loosely organized, and proportion is less.Behind the reactor seed sludge, move under the condition of following operation phase 1, the COD load is 1.01-1.48kg/ (m
3D), ascending gas surface velocity 0.0132m/s, the cycle of operation is 3h.Be 7d working time fs, adjust reactor parameter to reduce the settling time gradually, the 4th day settling time in this stage reduced to 8min gradually by 10min, thereby the mud that a large amount of settling properties are relatively poor washes out, and makes that the settling property of active sludge improves gradually in the reactor.
When the 4th day of this stage, in the sbr reactor device, observe a small amount of white granulated substance, illustrate that active floc sludge has had autohemagglutination trend.By data analysis as seen, MLSS has risen to 5335mg/L in the sbr reactor device, and VSS numerical value increases to 4552mg/L by 3472mg/L, and the numerical fluctuations of VSS/MLSS is bigger.
Operation phase two
Controlling reactor is moved under operation phase 2 condition behind the sbr reactor device operation 7d.Be that the COD load is 3.20～4.78kg/ (m
3D), the gas surface velocity is progressively brought up to 0.0172m/s increasing shearing force and to overcome resistance to mass transfer by 0.0132m/s, and increases oxygen delivery capacity.Subordinate phase working time is 14d.
The operation beginning a large amount of white particles just obviously occurred in the sbr reactor device in several days, but grain pattern is comparatively fluffy, the about 2-5mm of diameter.Has regular circular outer structure.After the subordinate phase operation 6 days, white particle disintegrates gradually and disappears among the SBR, and mud becomes floc sludge again.After the subordinate phase operation 8 days, occur the beige small-particle in the sbr reactor device, its particle diameter is all very little, and is granular for millet, and occurs thread connection between particle.
In the operation phase two, owing to reduced sedimentation time, the mud of settling property difference and granule sludge fragment are washed out, so the mud total amount descends in this stage initial reaction device.But after several days, the mud total amount begins again to be tending towards to rise, sludge quantity showed increased during to latter stage, and substantially all be the fluffy granule sludge of structure, floc sludge seldom, it is clear that effluent quality becomes, and illustrates that sludge settling property is better.
Operation phase three
Granule sludge particle diameter in the sbr reactor device operation 21d post-reactor is very big but loosely organized, for further obtaining the closely knit granule sludge of structure, adjust gradually the gas surface velocity by 0.0172m/s to 0.0218m/s, increase COD and load to 5.97～9.07kg/ (m
3D).Sedimentation time is reduced to 2min by 4min, and the particle with the relative sedimentation function difference of a part washes out again.In the phase III, sbr reactor device particle becomes greatly gradually, and late phase reaction device endoparticle mud form remains unchanged substantially, indicates that aerobic particle mud cultivates successfully.
Claims (5)
1. the application of rare earth element in aerobic particle mud cultivation and control sludge bulking.
2. application as claimed in claim 1 is characterized in that: described rare earth element is a solubility salt rare-earth compound.
3. application as claimed in claim 2 is characterized in that: described solubility salt rare-earth compound is a kind of in lanthanum nitrate, cerous nitrate, the neodymium nitrate.
4. as the described application of one of claim 1～3, it is characterized in that: the application method of described rare earth element is: cultivate startup from aerobic particle mud, added the rare earth element solution that concentration is no more than 30mg/L every three days in biochemical reactor.
5. application as claimed in claim 4 is characterized in that: the application method of described rare earth element is: cultivate startup from aerobic particle mud, added the rare earth element solution that concentration is 30mg/L every three days in biochemical reactor.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674541A (en) * | 2012-05-22 | 2012-09-19 | 北京师范大学 | Method for remedying filamentous expanded aerobic granular sludge |
| CN103112946A (en) * | 2013-03-05 | 2013-05-22 | 山东大学 | Culturing method of rare earth praseodymium modified aerobic granular sludge |
| CN106145350A (en) * | 2016-08-05 | 2016-11-23 | 浙江工业大学 | A kind of mud micropowder that adds maintains aerobic particle mud stable and the method for strengthened denitrification |
| CN106242045A (en) * | 2016-09-22 | 2016-12-21 | 湖南大学 | A kind of aerobic particle mud fast culture process |
| CN109437503A (en) * | 2018-12-26 | 2019-03-08 | 齐鲁工业大学 | A kind of technique and method of paper mill sludge minimizing |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3607925B2 (en) * | 1995-12-30 | 2005-01-05 | コーア株式会社 | Method for producing high spore seed sludge |
| CN1317208C (en) * | 2004-05-17 | 2007-05-23 | 湖南大学 | Automatized sequential reaction unit for aerobic particle sludge culture and research |
| CN1295162C (en) * | 2005-01-19 | 2007-01-17 | 南京大学 | Method for enhancing activity of anaerobic sludge by using rare earth |
| CN100404436C (en) * | 2005-06-03 | 2008-07-23 | 清华大学 | Culture method of aerobic nitrosated granular sludge |
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2006
- 2006-10-20 CN CNB2006100695025A patent/CN100393869C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102674541A (en) * | 2012-05-22 | 2012-09-19 | 北京师范大学 | Method for remedying filamentous expanded aerobic granular sludge |
| CN103112946A (en) * | 2013-03-05 | 2013-05-22 | 山东大学 | Culturing method of rare earth praseodymium modified aerobic granular sludge |
| CN106145350A (en) * | 2016-08-05 | 2016-11-23 | 浙江工业大学 | A kind of mud micropowder that adds maintains aerobic particle mud stable and the method for strengthened denitrification |
| CN106242045A (en) * | 2016-09-22 | 2016-12-21 | 湖南大学 | A kind of aerobic particle mud fast culture process |
| CN106242045B (en) * | 2016-09-22 | 2018-01-16 | 湖南大学 | A kind of aerobic particle mud fast culture process |
| CN109437503A (en) * | 2018-12-26 | 2019-03-08 | 齐鲁工业大学 | A kind of technique and method of paper mill sludge minimizing |
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