CN103951084B - A kind of preparation of immobilization straight-tube shape biological active filling material and application based on mesh carrier - Google Patents
A kind of preparation of immobilization straight-tube shape biological active filling material and application based on mesh carrier Download PDFInfo
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- CN103951084B CN103951084B CN201410137349.XA CN201410137349A CN103951084B CN 103951084 B CN103951084 B CN 103951084B CN 201410137349 A CN201410137349 A CN 201410137349A CN 103951084 B CN103951084 B CN 103951084B
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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
A kind of preparation of immobilization straight-tube shape biological active filling material and application based on mesh carrier, belongs to water treatment field. Straight-tube shape biological active filling material is made up of embedding body and carrier two parts; Carrier is taking polyethylene, polypropylene as main material, and adds the straight-tube shape carrier that polyvinyl alcohol water wetted material forms through hot melt or sheet material hot pressing; The network structure of carrier, can make embedding body run through mesh and carrier forms rivet clasp structure and increases filler resistance to overturning; Embedding liquid is mixed and is formed by bacterium concentrate and poly-vinyl alcohol solution; Embedding liquid is evenly coated on mesh carrier, forms embedding body after boric acid secondary cross-linking, and is incorporated into mesh carrier and obtains biological active filling material. The immobilization straight-tube shape biological active filling material that the present invention is prepared, has not only solved advantage of bacteria and has set up the problem such as difficulty, easy loss, and improved reactor for treatment ability, has shortened start-up time, has broad application prospects.
Description
Technical field
The invention belongs to water treatment field, particularly a kind of immobilization straight-tube shape biological active filling material preparation based on mesh carrierAnd application.
Background technology
Microbial cell immobilization technology can increase substantially microorganism concn, and the difficult loss of microorganism, shortening reactor are openedMoving time, mithridatism and acid and alkali-resistance, salt resistance ability obviously strengthen, and the ecological dominance of energy purifying and creation characteristic bacterium, produces specialProperty highly effective reaction, demonstrates good application prospect. The process for fixation that microbial cell is conventional has absorption method, cross-linking method and bagBury method. Wherein, the most conventional with investment, the material that has been successfully used to microbial cell embedding has: polyvinyl alcohol, agar,K-carragheen, gelatin, sodium alginate, polyacrylamide, polyurethane etc. Above-mentioned embedded material have to microorganism nontoxicity,Mass-transfer performance is good, be difficult for by biological decomposition, stable in properties, the feature such as mechanical 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, for example microballoon,Embedded block etc. The method is simple to operate, but limitation is large, cannot ideal application in the middle of engineering reality. We are through grinding for many yearsStudy carefully, on traditional embedding method, improve, embedding body and carrier are combined, form overall biological active filling material.Due to the combination of embedding body and carrier, make biological active filling material there is more performance, its inherited original simple bacterium withAll advantages of embedded material; Because making biological active filling material, the application of carrier material there is the characteristic that various carriers have, exampleAs advantages such as easy mobility, large, the difficult obstructions of specific area; Also can make as required can floated, precipitable formula, can floatFloating or region " fixed " etc. have the various forms of biological active filling materials of other function. Experimental study shows, utilizesThe conventional carriers such as existing Raschig ring, Pall ring, cascade ring, suspension modified filler and embedding body combine by adhesion modeThe biological active filling material making all exists resistance to overturning poor, and embedding body easily comes off, and causes the problems such as bacterium loss.
For the problems referred to above, before the immobilized biological activated filler that it is good that we develop a kind of resistance to overturning has a wide range of applicationsScape.
Summary of the invention
The object of the invention is to develop a kind of immobilization straight-tube shape biological active filling material based on mesh carrier, this biologically active is filled outThe network structure design of material carrier, makes embedding body be cross-linked to form overall rivet clasp structure by mesh and carrier, and embedding body is difficult for de-Fall, and embedding physical efficiency forms millimetre-sized membrane structure on network structure, make the biological active filling material resistance to overturning makingGood, overall permeability is good, and mass transfer effect is higher. Mesh carrier is designed to straight-tube shape, and current tangentially rub to biological active filling materialWiping can be accelerated the renewal of biological active filling material surface biological film, avoids varied bacteria growing, and hollow structure can make fluid pass, and can notCause biomembrane to stop up.
In order to realize above-mentioned state, the present invention has adopted following technical scheme:
An immobilization straight-tube shape biological active filling material based on mesh carrier, is characterized in that: described straight-tube shape biologically activeFiller entirety is hollow straight-tube shape, and the embedding body of the involved thalline of the meshed carrier of tool is cross-linked to form entirety by mesh and carrierRivet clasp structure, embedding body forms millimetre-sized membrane structure on network structure.
Mesh carrier, taking polyethylene, polyvinyl chloride, polypropylene, ABS resin macromolecular material as main, adds appropriate polyvinyl alcohol(PVA) water wetted material, by strand hot melt molding or sheet material hot pressing pore-forming mode, makes the tubular structure with netted barrelCarrier, tubular structure diameter is 0.5-3cm, height is 0.5-3cm, the mesh shape of its barrel can be circle, rhombus, square,Rectangle. The preferably string diameter 0.5-2mm of mesh.
The preparation method of above-mentioned a kind of straight-tube shape biological active filling material based on mesh carrier, is characterized in that, comprises the following steps:
(1), taking polyethylene, polyvinyl chloride, polypropylene, ABS resin macromolecular material as main, add appropriate polyvinyl alcohol (PVA)Water wetted material, by modes such as strand hot melt molding or sheet material hot pressing pore-formings, the straight-tube shape structure of making netted wall is carriedBody;
(2) embedding liquid poly-vinyl alcohol solution and bacterium concentrate being mixed to form is uniformly coated on the outer surface of straight-tube shape structure carrierUpper, according to polyvinyl alcohol-boric acid secondary cross-linking method, the straight-tube shape structure carrier that is coated with embedding liquid is put into saturated boronIn acid solution, after 1-3h, regulate BAS pH to 8-10, crosslinked 3-24h, is taken out, and cleans remained on surfaceMaterial, obtains biological active filling material.
The addition of polyvinyl alcohol (PVA) can suitably be adjusted as required, and this is prior art, preferably polyethylene alcohol (PVA)Quality percentage composition be 5-10%.
The straight-tube shape biological active filling material that the present invention is based on mesh carrier is applied to water treatment.
The beneficial effect of the immobilization straight-tube shape biological active filling material based on mesh carrier of the present invention is mainly reflected in:
1. cancellated design, makes embedding body form overall rivet clasp structure by mesh, and embedding body difficult drop-off, makes the life makingThing active filler resistance to overturning is good, is conducive to the bacterial concentration that keeps higher;
2. mesh carrier is designed to straight-tube shape, and current can impel life to tangential (barrel outer surface is tangential) friction of biological active filling materialThing filler rotates along central shaft, and then accelerates the renewal of biological active filling material surface biological film, avoids the growth of miscellaneous bacteria, hollowStructure can make fluid pass, and can not cause tubular inner chamber biomembrane to stop up;
3. experimental study shows, taking conventional filler as the carrier immobilized biological active filling material obtaining, and poor stability, embedding material in 2 daysMaterial almost all comes off, and the biological active filling material resistance to overturning obtaining with mesh carrier immobilization is good, and the filler life-span is 3More than year;
4. the biological active filling material that immobilization makes, global density can be close to water, be greater than water or be less than water, can be made into floated,Precipitating type or floatation type, can make the biological active filling material with certain function, example according to the demand of water treatment working conditionAs fixable type etc.;
5. mesh carrier is main material by polyethylene, polyvinyl chloride, polypropylene, ABS resin, has added polyvinyl alcohol (PVA)Water wetted material, has improved the hydrophily of carrier, has increased the intensity of carrier and embedding body bonding, has improved overall stability;
6. when biological active filling material makes embedding body can implementation structure thickness less due to the existence of mesh skeleton structure, do not lose again wholeThe variability of body structure to water treatment running environment, less thickness can be realized higher mass-transfer efficiency and the higher profit of embedding bodyBy rate, in water treatment technology processing unit, cannot realize good filler if make thickness like this with embedding body self materialPerformance;
7. immobilized biological activated filler bag bacterium amount is large, can set up flora advantage, and treatment effeciency is high;
8. the surface area of biological active filling material is all effective area, has avoided the waste of material.
Brief description of the drawings
Fig. 1 is straight-tube shape biological active filling material schematic diagram;
Fig. 2 is I-I generalized section;
Fig. 3 is II-II generalized section.
1. twines in figure, 2. embedding body.
Detailed description of the invention
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.
Example 1
1. the preparation of mesh carrier
Taking high molecular polymers such as polypropylene as main material, add water wetted material polyvinyl alcohol (PVA) (preferably 5% containAmount), making diameter is 0.5 ?1.5cm, and height is the straight-tube shape structure wire side carrier of 0.5 ?1.5cm, and its mesh is shaped as prosShape, string diameter is 0.5mm.
2. the processing of nitrobacteria
Taking municipal wastewater treatment plant second pond excess sludge as bacterium source, by centrifugal dense the nitrobacteria bacteria suspension after screening enrichment cultureContracting, obtains 3.5 × 109The nitrobacteria concentrate of individual/mL.
3. obtaining of nitrobacteria embedding liquid
Weighing polyvinyl alcohol 500g, adds to be heated to 90 DEG C after 4000ml ultra-pure water and to dissolve 15min, and taking-up stirsAfter be heated to again 90 DEG C and dissolve 5min, after taking-up, stir and be cooled to 30 DEG C, by 4000ml poly-vinyl alcohol solution andThe 1000ml concentrate preparing mixes, and adds 100g calcium carbonate, makes 5000ml embedding liquid after stirring.
4. the combination of embedding liquid and mesh carrier
Embedding liquid is uniformly coated on to mesh carrier outer surface, guarantees that mesh carrier surface is all covered evenly by embedding liquid.
5. the preparation of nitrobacteria biological active filling material
The mesh carrier of smearing embedding liquid in step (4) is put into saturated BAS, make it in floodage, quietPut 3h, regulator solution pH to 9.0, standing 4h completes immobilization, cleans, and obtains nitrobacteria biological active filling material,
This biological active filling material proportion 0.95 ?between 1.10.
6. the application of biological active filling material activity
In the reactor of 100L, add embedded tubular biological active filling material, filling rate is 30%, 25 ± 2 DEG C of water temperatures,HRT=4h, pH be 7.5 ?8.5, dissolved oxygen be 2.0 ?4.0mg/L, NH4 +?N concentration be 160mg/L, biological active filling materialUnder the effect of air lift, become suspension fluidized state, on time the nitrification effect of assaying reaction device. Water outlet testing result shows, anti-Answer device cultivating 97.5% of the nitrification activity that returns to after 1 week before embedding, NH4 +?N concentration below 3mg/L, removeRate is more than 98.1%, and coming off, do not appear in the continuous 3 years ' operation of biological active filling material, and nitrification effect is stable.
Example 2
1. the preparation of mesh carrier
Taking high molecular polymers such as polyethylene as main material, add water wetted material polyvinyl alcohol (PVA) (content 6%),Making diameter is 1.0 ?2.0cm, and height is the straight-tube shape mesh carrier of 1.0 ?2.0cm, and its mesh is shaped as rhombus, string diameter0.5mm。
2. the processing of nitrobacteria
Taking municipal wastewater treatment plant second pond excess sludge as bacterium source, by centrifugal dense the nitrobacteria bacteria suspension after screening enrichment cultureContracting, obtains 3.5 × 109The nitrobacteria concentrate of individual/mL.
3. obtaining of nitrobacteria embedding liquid
Weighing polyvinyl alcohol 5kg, adds to be heated to 90 DEG C after 40L ultra-pure water and to dissolve 15min, takes out after stirring and addsHeat is dissolved 5min to 90 DEG C, stirs and is cooled to 30 DEG C, by 40L poly-vinyl alcohol solution with prepare after taking-up10L nitrobacteria concentrate mixes, and adds 1kg calcium carbonate, makes 50L embedding liquid after stirring.
4. the combination of embedding liquid and mesh carrier
Embedding liquid is uniformly coated on to straight-tube shape carrier surface, guarantees that mesh carrier surface is all covered evenly by embedding liquid.
5. the preparation of nitrobacteria biological active filling material
The mesh carrier of smearing embedding liquid in step (4) is put into saturated BAS, make it in floodage, quietPut 3h, regulator solution pH to 9.0, standing 4h completes immobilization, cleans, and obtains nitrobacteria biological active filling material,This biological active filling material proportion 0.95 ?between 1.10.
6. the application of biological active filling material activity
To 1m3Laboratory in ripe A2In the Aerobic Pond of O reactor, add embedded straight-tube shape biological active filling material,Filling rate is 30%, 20 ± 2 DEG C of water temperatures, HRT=2.5h, dissolved oxygen be 2.0 ?4.0mg/L, influent quality is urban life dirtWater (NH4 +?N concentration be 40 ?70mg/L), measure the nitrification ability of Aerobic Pond on time, testing result shows, reactor existsCultivate after 1 week and reach stable state, water outlet NH4 +?N concentration be below 5mg/L, clearance more than 90%, operation 1After year, still without embedding body obscission, Nitrification is stable.
Above-mentioned example shows, utilizing mesh carrier to carry out nitrobacteria immobilization, to prepare biological active filling material operating process simple,The overall rivet clasp structure that embedding body and carrier form by mesh, makes that the biological active filling material resistance to overturning that makes is good, bagBury body difficult drop-off, bacterial concentration is higher, can cultivate return to embedding after 1 week before nitrification activity 97.5%, and this is rawThing active filler good stability, long service life, has good application prospect.
Claims (1)
1. prepare a method for the straight-tube shape biological active filling material based on mesh carrier, described straight-tube shape biological active filling material entiretyBe hollow straight-tube shape, the embedding body of the involved thalline of the meshed carrier of tool is cross-linked to form overall riveting by mesh and carrierFixing structure, embedding body forms millimetre-sized membrane structure on mesh carrier;
Mesh carrier, taking polyethylene, polyvinyl chloride, polypropylene or ABS resin macromolecular material as main, adds appropriate polyvinyl alcohol (PVA)Water wetted material, by strand hot melt molding or sheet material hot pressing pore-forming mode, makes the tubular structure carrier with netted barrel, cylinderShape diameter of movement is 0.5-3cm, and height is 0.5-3cm, and the mesh of its barrel is shaped as circle, rhombus or rectangle, the string diameter of twine0.5-2mm; It is characterized in that, comprise the following steps:
(1), taking polyethylene, polyvinyl chloride, polypropylene, ABS resin macromolecular material as main, add appropriate polyvinyl alcohol (PVA)Water wetted material, by strand hot melt molding or sheet material hot pressing pore-forming mode, makes the straight-tube shape structure carrier of netted wall;
(2) embedding liquid bacterium liquid and poly-vinyl alcohol solution being mixed to form is uniformly coated on the outer surface of straight-tube shape structure carrier, rootAccording to polyvinyl alcohol-boric acid secondary cross-linking method, the straight-tube shape carrier that is coated with embedding liquid is put into saturated BASAfter 1-3h, regulate BAS pH to 8-10, crosslinked 3-24h, is taken out, and cleans remained on surface material, obtainsStraight-tube shape biological active filling material.
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