CN103951073A - Preparation and application of ammonia oxidizing bacteria immobilized star-shaped bioactive filler based on reticulate carrier - Google Patents
Preparation and application of ammonia oxidizing bacteria immobilized star-shaped bioactive filler based on reticulate carrier Download PDFInfo
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- CN103951073A CN103951073A CN201410137191.6A CN201410137191A CN103951073A CN 103951073 A CN103951073 A CN 103951073A CN 201410137191 A CN201410137191 A CN 201410137191A CN 103951073 A CN103951073 A CN 103951073A
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- oxidizing bacteria
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- ammonia oxidizing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses an ammonia oxidizing bacteria immobilized star-shaped bioactive filler based on a reticulate carrier, and preparation and an application thereof, and belongs to the technical field of water treatment. The star-shaped bioactive filler comprises two parts: an embedding body and the carrier; the carrier is a star-shaped reticulate carrier formed by taking polyethylene or polypropylene as a main material, adding a polyvinyl alcohol hydrophilic material and carrying out hot melting or plate hot pressing; with a reticulate structure of the carrier, the embedding body can be allowed to penetrate through meshes to form a riveting fixing structure so as to increase the filler overall stability; an embedding liquid is formed by mixing an ammonia oxidizing bacteria concentrated solution and a polyvinyl alcohol solution; the reticulate carrier is evenly coated with the embedding liquid, and the embedding body is formed after boric acid secondary cross-linking and is combined with the reticulate carrier to obtain the ammonia oxidizing bacteria bioactive filler. The prepared ammonia oxidizing bacteria immobilized star-shaped bioactive filler not only solves the problems that ammonia oxidizing bacteria are difficult in advantage establishment, easy to lose and the like, but also improves the processing ability of a reactor, shortens the start-up time, and has broad application prospects.
Description
Technical field
The present invention relates to water treatment field, particularly a kind of preparation of ammonia oxidizing bacteria immobilization star biological active filling material and application based on mesh carrier.
Background technology
Now, ammonia and nitrogen pollution problem is more and more serious, and ammonia nitrogen becomes 12 and reduces discharging new binding target, and promoting the ammonia and nitrogen pollution level of preventing and treating becomes the necessary behave that improves quality of water environment.At present, ammonia nitrogen waste water treatment method is divided into three major types, physico-chemical process, biochemical process and advanced oxidation processes.Biochemical process is due to technical maturity, and stable performance is acknowledged as a kind of economy, effective and the most rising method.Biochemical process comprises activated sludge process and biomembrance process.In traditional activated sludge process, by sludge reflux, keep amount of bacteria, just must increase quantity of reflux keeps high bacterial concentration to want to obtain high-level efficiency, will cause like this running cost to rise, obviously unactual.In addition, the generation cycle of nitrobacteria is long, and increment speed is slow, causes in reactor nitrobacteria concentration low, and processing efficiency is difficult to improve.Be subject to seasonal effect large.Summer temp raises, and biochemical speed is fast, and to winter, northern most of Sewage Plant all can face thread microbial sludge bulking problem, causes nitrifier to be run off, and then causes water outlet ammonia nitrogen to exceed standard.Therefore, can consider that applying biological embrane method makes up the shortcoming in activated sludge process, but biomembrance process has problems equally, for nitrobacteria, poor due to self film forming ability, natural membrane is chronic, and natural membrane non-selectivity, is difficult to form highdensity flora advantage.Various reasons shows, traditional biochemical process cannot reach efficient nitrification efficiency.
Nitration reaction is that ammonia oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) acting in conjunction complete, and AOB is oxidized to sub-nitrogen by ammonia nitrogen, and NOB further changes into nitre nitrogen by sub-nitrogen.Short distance nitration claims again nitrosification, and this technique can reduce 25% nitrated oxygen requirement, 40% denitrifying carbon source, 50% sludge yield and denitrification pool volume.
Microorganism cells immobilization technology can increase substantially microorganism concn, making microorganism be difficult for loss, shortening reactor start-up time, toxin immunity and acid and alkali-resistance, salt resistance ability obviously strengthens, the ecological dominance of energy purifying and creation characteristic bacterium, produce characteristic highly effective reaction, demonstrate good application prospect.The process for fixation that microorganism cells is conventional has absorption method, crosslinking and entrapping method.Wherein, the most conventional with entrapping method, the material that has been successfully used to microorganism cells embedding has: polyvinyl alcohol, agar, K ?carrageenin, gelatin, sodium alginate, polyacrylamide, urethane etc.That above-mentioned embedded material has is good to microorganism nontoxicity, mass-transfer performance, be difficult for by biological decomposition, stable in properties, the feature such as physical strength is high, the life-span is long, price is low.
At present, traditional bacterium embedding method is that bacterium and embedded material are combined, and forms embedding body, such as microballoon, embedded block etc.This method is simple to operate, but limitation is large, cannot ideal application in the middle of engineering reality.We,, through research for many years, improve on traditional embedding method, and embedding body and carrier are combined, and form whole biological active filling material.Due to the combination of embedding body and carrier, make biological active filling material there is more performance, it has inherited all advantages of original simple bacterium and embedded material; Because the application of solid support material makes biological active filling material have the characteristic that various carriers have, large such as easy mobility, specific surface area, be difficult for the advantages such as obstruction; The various forms of biological active filling materials that also can make as required can floated, precipitable formula, floatability formula or region " fixed " etc. have other function.Experimental study shows, utilizing the conventional carriers such as existing Raschig ring, Pall ring, cascade ring, suspension modified filler and embedding body to combine by adhesion mode the biological active filling material making all exists resistance to overturning poor, embedding body easily comes off, and causes the problems such as bacterium loss.
For the problems referred to above, the immobilized biological activated filler that it is good that we develop a kind of resistance to overturning is with a wide range of applications.
Summary of the invention
The object of the invention is to develop a kind of ammonia oxidizing bacteria immobilization star biological active filling material based on mesh carrier, the reticulated structure design of this biological active filling material carrier, make embedding body form whole rivet clasp structure by mesh and carrier, embedding body difficult drop-off, and embedding physical efficiency forms millimetre-sized membrane structure on reticulated structure, make the ammonia oxidizing bacteria biological active filling material resistance to overturning that makes good, whole permeability is good, and mass transfer effect is higher.Mesh carrier is designed to star, between ammonia oxidizing bacteria biological active filling material all the time in fluffy state, there will not be filler to stop up, current short circuit problem, and the embedding body on each fin can not be subject to extraneous friction, guaranteed ammonia oxidizing bacteria concentration, biological active filling material processing efficiency is high, nitrosification stable performance.Short distance nitration technique has not only been saved the energy and has also been reduced expense.
In order to realize above-mentioned state, the present invention has adopted following technical scheme.
A kind of preparation of the ammonia oxidizing bacteria immobilization star biological active filling material based on mesh carrier, it is characterized in that: take polyethylene, polyvinyl chloride, polypropylene, ABS resin macromolecular material as main, add 6wt% ?9wt% polyvinyl alcohol (PVA) water wetted material, by strand hot melt or sheet material hot pressing pore-forming mode, make sheet shape mesh carrier, the net sheet that forms star carrier, its length be 0.5 ?3cm, wide be 0.5 ?3cm; String diameter be 0.5 ?2mm; Mesh can be square, rhombus, rectangle, circle; The mesh carrier of some shapes is made to stellate reticulum carrier (seeing figure) according to different angles by hot melt extruded, the mode such as bonding, angle between adjacent two sheet shape mesh carriers equates, for example three, four, five, six mesh carriers, adopt respectively the angle of 120 °, 90 °, 72 °, 60 ° to make different shapes stellate reticulum carrier; Net sheet quantity with 3 ?6 be advisable; Take municipal wastewater treatment plant second pond excess sludge as bacterium source, and the ammonia oxidizing bacteria bacteria suspension centrifugal concentrating by after screening enrichment culture, obtains 10
8?10
10the ammonia oxidizing bacteria concentrated solution of individual/mL; According to Ju Yi Xi Chun ?boric acid secondary crosslinking method, ammonia oxidizing bacteria concentrated solution and polyvinyl alcohol solution are mixed, and add calcium carbonate and be prepared into embedding liquid, polyvinyl alcohol mass concentration be 80 ?100g/L, calcium carbonate mass concentration be 10 ?40g/L; Above-mentioned embedding liquid is uniformly coated on mesh carrier, put into saturated boric acid solution 1 ?after 3h, regulate boric acid solution pH to 8 ?10, crosslinked 3 ?24h.Taken out, cleaned remained on surface material, obtained ammonia oxidizing bacteria biological active filling material.
The above-mentioned ammonia oxidizing bacteria immobilization star biological active filling material based on mesh carrier is for water treatment.
The beneficial effect of the ammonia oxidizing bacteria immobilization star biological active filling material based on mesh carrier of the present invention is mainly reflected in:
1. cancellated design, make ammonia oxidizing bacteria embedding body form whole rivet clasp structure by mesh and carrier, embedding body difficult drop-off, makes the ammonia oxidizing bacteria biological active filling material resistance to overturning that makes good, be conducive to the ammonia oxidizing bacteria concentration that keeps higher, nitrosification efficiency is high;
2. mesh carrier is designed to star, this structure has guaranteed that the embedding body between ammonia oxidizing bacteria biological active filling material fin can not be subject to extraneous friction, be conducive to the ammonia oxidizing bacteria concentration that keeps higher, ammonia oxidizing bacteria biological active filling material nitrosification efficiency is high, stable performance;
3. experimental study shows, take conventional filler as the carrier immobilized ammonia oxidizing bacteria biological active filling material obtaining, poor stability, in 2 days, embedded material almost all comes off, and the ammonia oxidizing bacteria biological active filling material resistance to overturning obtaining with mesh carrier immobilization is good, the filler life-span is more than 3 years;
4. the ammonia oxidizing bacteria biological active filling material that immobilization makes, whole proportion is between 0.91 ?1.10, and under gas stripping, fluidized state is good, does not exist corner to pile up, the problems such as current short circuit;
5. mesh carrier is main raw by polyethylene, polyvinyl chloride, polypropylene, ABS resin, added 5wt% ?polyvinyl alcohol (PVA) water wetted material of 10wt%, improve the wetting ability of carrier, increased the intensity of carrier and embedding body bonding, improved whole stability;
6. when ammonia oxidizing bacteria biological active filling material makes ammonia oxidizing bacteria embedding body can implementation structure thickness less due to the existence of mesh skeleton structure, do not lose again the variability of one-piece construction to water treatment running environment, less thickness can be realized higher mass-transfer efficiency and the higher utilization ratio of embedding body, if make thickness like this with ammonia oxidizing bacteria embedding body self material, in water technology processing unit, cannot realize good carrier performance;
7. the immobilized biological activated filler bag of ammonia oxidizing bacteria bacterium amount is large, can set up ammonia oxidizing bacteria flora advantage, can realize short distance nitration, and nitrosification efficiency is high;
8. the surface-area of biological active filling material is all useful area, has avoided the waste of material;
9. ammonia oxidizing bacteria population advantage can be oxidized to ammonia control in sub-nitrogen, realizes short distance nitration and has not only saved the energy and also reduced expense.
Accompanying drawing explanation
Fig. 1 is ammonia oxidizing bacteria star biological active filling material fin schematic diagram;
Fig. 2 Wei Ⅰ ?I diagrammatic cross-section;
Fig. 3 Wei Ⅱ ?II diagrammatic cross-section;
Fig. 4,5,6,7 is ammonia oxidizing bacteria star biological active filling material schematic diagram.
1. twines in figure, 2. embedding body.
Embodiment
Below in conjunction with case study on implementation, the present invention is more specifically described, but embodiments of the present invention are not limited to this.
Embodiment 1
1. the preparation of mesh carrier
Take the high molecular polymers such as polypropylene as main raw, add the polyvinyl alcohol (PVA) of 10wt%, system is grown into 2.0cm, and wide is the sheet shape mesh carrier of 1.5cm.Mesh is shaped as square, and the length of side is 2mm, and string diameter is 1.55mm.Six above-mentioned shape carriers are passed through to the stellate reticulum carrier of hot melt, bonding formation angle 60 ゜.
2. the processing of ammonia oxidizing bacteria
Take municipal wastewater treatment plant second pond excess sludge as bacterium source, and the ammonia oxidizing bacteria bacteria suspension centrifugal concentrating by after screening enrichment culture, obtains 4.0 * 10
9the ammonia oxidizing bacteria concentrated solution of individual/mL.
3. ammonia oxidizing bacteria embedding liquid obtains
Weighing polyvinyl alcohol 5kg, add 25L ultrapure water post-heating to 90 ℃ to dissolve 15min, after stirring, taking-up reheats to 90 ℃ of dissolving 5min, after taking-up, stir and be cooled to 30 ℃, 25L polyvinyl alcohol solution and the 25L bacteria suspension preparing are mixed, and add 1kg calcium carbonate, after stirring, make 50L embedding liquid.
4. the combination of embedding liquid and mesh carrier
Embedding liquid is uniformly coated on to mesh carrier surface, guarantees that mesh carrier surface is all covered evenly by embedding liquid.
5. the preparation of ammonia oxidizing bacteria biological active filling material
The mesh carrier of smearing embedding body in step (4) is put into saturated boric acid solution, make it in submerged condition, standing 3h, regulator solution pH to 9.0, standing 4h completes immobilization, cleans, obtain ammonia oxidizing bacteria biological active filling material, this biological active filling material proportion 0.95 ?between 1.05.
6. the application of biological active filling material activity
To 1m
3reactor in add embedded above-mentioned nitrated biological active filling material, filling ratio is 40%, 20 ± 2 ℃ of water temperatures, HRT=4h, pH be 7.8 ?8.3, dissolved oxygen be controlled at 1.5 ?2mg/L, NH
4 +?N concentration is 160mg/L, and biological active filling material becomes suspension fluidized state under the effect of air lift, and can phase mutual friction, the on time nitrification effect of assaying reaction device between filler.Water outlet detected result shows, reactor returns to 96.5% of nitrification activity before embedding, NH after cultivating 1 week
4 +?N concentration below 5mg/L, clearance is more than 96.8%, sub-nitrogen accumulation rate, all more than 90%, has realized short distance nitration, moves after 1 year still without embedding body obscission, nitrosification stable performance.
Embodiment 2
1. the preparation of mesh carrier
Take the high molecular polymers such as polyethylene as main raw, add water wetted material polyvinyl alcohol (PVA), system is grown into 2.0cm, and wide is 1.0 sheet shape mesh carrier.Mesh is shaped as rectangle, and long is 2mm, and wide is 1.5mm, and string diameter is 1mm.Five above-mentioned shape carriers are passed through to the stellate reticulum carrier of hot melt, bonding formation angle 72 ゜.
2. the processing of ammonia oxidizing bacteria
Take municipal wastewater treatment plant second pond excess sludge as bacterium source, and the ammonia oxidizing bacteria bacteria suspension centrifugal concentrating by after screening enrichment culture, obtains 3.0 * 10
9the ammonia oxidizing bacteria concentrated solution of individual/mL.
3. ammonia oxidizing bacteria embedding liquid obtains
Weighing polyvinyl alcohol 5kg, add 25L ultrapure water post-heating to 90 ℃ to dissolve 15min, after stirring, taking-up reheats to 90 ℃ of dissolving 5min, after taking-up, stir and be cooled to 30 ℃, 25L polyvinyl alcohol solution and the 25L bacteria suspension preparing are mixed, and add 1kg calcium carbonate, after stirring, make 50L embedding liquid.
4. the combination of ammonia oxidizing bacteria embedding liquid and mesh carrier
Ammonia oxidizing bacteria embedding liquid is uniformly coated on to mesh carrier surface, guarantees that mesh carrier surface is all covered evenly by embedding liquid.
5. the preparation of ammonia oxidizing bacteria biological active filling material
The mesh carrier of smearing embedding liquid in step (4) is put into saturated boric acid solution, make it in submerged condition, standing 3h, regulator solution pH to 9.0, standing 4h completes immobilization, cleans, obtain ammonia oxidizing bacteria biological active filling material, this biological active filling material proportion be 0.98 ?between 1.10.
6. the application of ammonia oxidizing bacteria biological active filling material activity
To 1m
3laboratory in ripe A
2in the Aerobic Pond of O reactor, add embedded star ammonia oxidizing bacteria biological active filling material, filling ratio is 40%, 20 ± 2 ℃ of water temperatures, HRT=2h, dissolved oxygen be 1.0 ?1.5mg/L, influent quality is city domestic sewage (NH
4 +?N concentration be 40 ?70mg/L), measure the nitrification ability of Aerobic Pond on time, detected result shows, reactor reaches steady state, water outlet NH after cultivating 1 week
4 +?N concentration below 5mg/L, clearance is more than 90%, sub-nitrogen accumulation is all more than 98%.Move after 1 year still without embedding body obscission, nitrosification effect stability.
Above-mentioned example shows, utilizing mesh carrier to carry out ammonia oxidizing bacteria immobilization, to prepare biological active filling material operating process simple, the whole rivet clasp structure that embedding body and carrier form by mesh, make that the ammonia oxidizing bacteria biological active filling material resistance to overturning that makes is good, embedding body difficult drop-off, ammonia oxidizing bacteria concentration is higher, form dominant population, can be before operation return to embedding after 1 week nitrification activity 96.5%, short distance nitration effect stability, and this biological active filling material good stability, long service life, has good application prospect.
Claims (5)
1. the preparation method of the ammonia oxidizing bacteria immobilization star biological active filling material based on mesh carrier, it is characterized in that: comprise the following steps: with polyethylene, polyvinyl chloride, polypropylene or ABS resin macromolecular material are main, add 6wt%-9wt% polyvinyl alcohol (PVA) water wetted material, by strand hot melt or sheet material hot pressing pore-forming mode, make sheet shape mesh carrier, some shape mesh carriers are passed through to hot melt extruded according to different angles, bonding mode is made stellate reticulum carrier, angle between adjacent two sheet shape mesh carriers equates, take municipal wastewater treatment plant second pond excess sludge as bacterium source, by the ammonia oxidizing bacteria centrifugal concentrating after screening enrichment culture, obtain 10
8-10
10the ammonia oxidizing bacteria concentrated solution of individual/mL, according to polyvinyl alcohol-boric acid secondary crosslinking method, ammonia oxidizing bacteria concentrated solution and polyvinyl alcohol solution are mixed, and add calcium carbonate and be prepared into embedding liquid, polyvinyl alcohol mass concentration is 80-100g/L, calcium carbonate mass concentration is 10-40g/L, above-mentioned embedding liquid is uniformly coated on mesh carrier, put into after saturated boric acid solution 1-3h, regulate boric acid solution pH to 8-10, crosslinked 3-24h, by its taking-up, clean remained on surface material, obtain the ammonia oxidizing bacteria immobilization star biological active filling material based on mesh carrier.
2. according to the preparation method of claim 1, it is characterized in that: form the net sheet of star carrier, it is long is 0.5-3cm, and wide is 0.5-3cm, and string diameter is 0.5-2mm, and mesh is square, rhombus, rectangle or circle.
3. a shape mesh carrier quantity is advisable with 3-6 sheet, and three, four, five, six mesh carriers adopt respectively the angle of 120 °, 90 °, 72 °, 60 ° to make different shapes stellate reticulum carrier.
4. the ammonia oxidizing bacteria immobilization star biological active filling material based on mesh carrier preparing according to the method for claim 1-3.
5. the ammonia oxidizing bacteria immobilization star biological active filling material based on mesh carrier preparing according to the method for claim 1-3 is for water treatment.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105923793A (en) * | 2016-06-22 | 2016-09-07 | 北京工业大学 | Micro-porous biological film based on mesh structure and used for fixedly adding carrier filler |
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| CN101746881A (en) * | 2009-12-11 | 2010-06-23 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | Honeycomb network pipe bio-carrier |
| CN103193315A (en) * | 2013-04-12 | 2013-07-10 | 北京工业大学 | Method for preparing bioactive filler through immobilization of anaerobic ammonia oxidizing bacterium |
| CN103657399A (en) * | 2012-09-06 | 2014-03-26 | 中国石油化工股份有限公司 | Preparation method of macromolecule activated carbon composite filler |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101746881A (en) * | 2009-12-11 | 2010-06-23 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | Honeycomb network pipe bio-carrier |
| CN103657399A (en) * | 2012-09-06 | 2014-03-26 | 中国石油化工股份有限公司 | Preparation method of macromolecule activated carbon composite filler |
| CN103193315A (en) * | 2013-04-12 | 2013-07-10 | 北京工业大学 | Method for preparing bioactive filler through immobilization of anaerobic ammonia oxidizing bacterium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105923793A (en) * | 2016-06-22 | 2016-09-07 | 北京工业大学 | Micro-porous biological film based on mesh structure and used for fixedly adding carrier filler |
| CN105923793B (en) * | 2016-06-22 | 2018-11-30 | 北京工业大学 | It is a kind of that fixed addition carrier filler is suitble to based on mesh-structured micropore biological film |
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