CN107602770A - Modified polyurethane carrier of uv photo initiated grafting acrylic acid and preparation method and application - Google Patents
Modified polyurethane carrier of uv photo initiated grafting acrylic acid and preparation method and application Download PDFInfo
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- CN107602770A CN107602770A CN201610547432.3A CN201610547432A CN107602770A CN 107602770 A CN107602770 A CN 107602770A CN 201610547432 A CN201610547432 A CN 201610547432A CN 107602770 A CN107602770 A CN 107602770A
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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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The present invention relates to modified polyurethane carrier of uv photo initiated grafting acrylic acid and preparation method and application.The preparation method includes：Step 1：Polyurethane carrier is placed in into reaction to trigger in solution after immersion, takes out drying；The reaction triggers the alcoholic solution that solution is sensitising agent；Step 2：The dried Polyurethane carrier that step 1 is obtained is immersed in acrylic acid solution after progress ultraviolet radiation, and taking-up is cleaned, and obtains the Polyurethane carrier of hydrophilic modifying.The preparation method of the present invention can significantly improve the hydrophily of Polyurethane carrier, be advantageous to the absorption and fixation of microorganism；And secondary modification can easily be carried out by the reactivity of acrylic acid；The Polyurethane carrier of the hydrophilic modifying obtained by preparation method of the present invention has good application prospect in fields such as microbial immobilized, municipal sewage treatment, petroleum industrial sewage, biology, the energy.
Description
Technical field
The present invention relates to the surface modification processes of Polyurethane carrier, the poly- ammonia of modification of specially a kind of uv photo initiated grafting acrylic acid
Ester carrier and preparation method and application.
Background technology
Polyurethane carrier has voidage high, and specific surface area is big, impact resistance and it is durable in use the features such as, be widely used in
Microbial fixed carrier is used as in sewage treatment plant.
Absorption and fixation of the microorganism in Polyurethane carrier can significantly improve the microorganism concn of sewage treatment plant, increase
Strong Biochemical Treatment, shorten processing time；Polyurethane carrier has that volumetric loading is high, to difficult degradation good sewage processing effect,
Excess sludge yield is few and does not produce the advantages that sludge bulking.
Because the hydrophilicity of Polyurethane carrier is poor, easily floating, microorganism colonization time be present after being added to sewage plant
It is long, it is easy to fall off the shortcomings of, turn into the study hotspot of educational circles in recent years by the modified hydrophily for improving Polyurethane carrier.
Patent " preparation and application of a kind of immobilized biological activated filler of nitrobacteria based on Polyurethane carrier " (application
Number 201410137211.X) by the mode such as extruding nitrobacteria concentrate and polyvinyl alcohol solution are immersed into polyurethane foam
Inside foam, embedding body is formed after boric acid secondary cross-linking, the problems such as nitrobacteria advantage establishes difficulty, is easy to run off is solved, carries
High reactor for treatment ability, shortens and starts the time." a kind of hydrophilic modifying polystyrene material surface has efficacious prescriptions to patent
Method " (application number 201510865981.0) introduces active alkylhalide group acyl group or alkylhalide group in polystyrene material surface first,
Then natural polysaccharide or oligosaccharides are grafted to polystyrene surface in the basic conditions, have that step is simple, mild condition, gained
Hydrophilic coating stablize the advantages that difficult for drop-off, and surface is rich in hydroxyl, in the color of cell culture, enzyme immobilization and protein
Spectrum separation field has very big application potential.
" polyester textile uv photo initiated grafting SSS and its performance study " (Zhang Cuiling, polyester industrial, 2011,24
(4):20-22) under nitrogen protection, ultraviolet light, with benzophenone (BP) for light trigger, SSS is triggered to exist
The graft polymerization on polyester textile surface.Its result shows, water absorbing properties, dyeing after the surface grafting of polyester textile sulfonic acid group
Performance has obtained significantly improving.
The content of the invention
The technical problem to be solved in the present invention：
Polyurethane carrier has good mechanical property and biocompatibility, but the hydrophobicity on its surface is to a certain extent
Its further application is limited, its application can be widened by improving the hydrophily of Polyurethane carrier.
Acrylic acid is a kind of hydrophily function monomer, containing the functional group such as double bond and carboxyl, there is good reactivity.
It is an object of the invention to provide a kind of preparation method of uv photo initiated grafting acrylic acid modified polyurethane carrier, this method
Be under ultraviolet light conditions, using sensitising agent trigger it is acrylic acid-grafted on Polyurethane carrier, polyurethane can be significantly improved
The hydrophily of carrier, be advantageous to the absorption and fixation of microorganism；And it can easily carry out two by the reactivity of acrylic acid
Secondary modification；The present invention has fine in fields such as microbial immobilized, municipal sewage treatment, petroleum industrial sewage, biology, the energy
Application prospect.
The present invention adopts the technical scheme that：
A kind of preparation method of uv photo initiated grafting acrylic acid modified polyurethane carrier, comprises the following steps：
Step 1：Polyurethane carrier is placed in into reaction to trigger in solution after immersion, takes out and dries (such as naturally dry)；It is described
Reaction triggers the alcoholic solution that solution is sensitising agent；
Step 2：The dried Polyurethane carrier that step 1 is obtained, which is immersed in acrylic acid solution (solvent is acetone), to be carried out
After ultraviolet radiation, take out and clean (as used distilled water), obtain the Polyurethane carrier of hydrophilic modifying.
In above-mentioned preparation method, sensitising agent described in step 1 is benzophenone or 2,4-DihydroxyBenzophenone；
And/or it is 0.1-0.8mol/L, preferably 0.2- that the sensitising agent triggers the concentration in solution in the reaction
0.5mol/L；
And/or the reaction triggers solution as the methanol solution of the sensitising agent or the ethanol solution of the sensitising agent.
In above-mentioned preparation method, Polyurethane carrier used in step 1 is length of side 2-3cm cube；
And/or the Polyurethane carrier used in step 1 is expansion type Polyurethane carrier.
In above-mentioned preparation method, the time soaked described in step 1 is 1-2h.
In above-mentioned preparation method, acrylic acid solution concentration described in step 2 is 10%-25%, preferably 15%-20%
(weight/mass percentage composition).
In above-mentioned preparation method, the time of ultraviolet radiation is 10-30min in step 2.
In above-mentioned preparation method, step 1 and step 2 are carried out under the conditions of normal temperature (i.e. 20-25 DEG C).
The Polyurethane carrier for the hydrophilic modifying that any of the above-described preparation method of present invention protection obtains.
The Polyurethane carrier for the hydrophilic modifying that any of the above-described preparation method obtains can be used for microbial immobilized.
The Polyurethane carrier for the hydrophilic modifying that any of the above-described preparation method obtains can be used for sewage disposal.
The sewage or the purpose of sewage disposal include it is following at least one of a) or b)：
A) the COD contents of sewage are reduced；
B) ammonia-nitrogen content of sewage is reduced.
Beneficial effects of the present invention are as follows：
1) present invention using the method grafted propylene acid of ultraviolet radiation in Polyurethane carrier, because ultraviolet light is to material
Penetrability it is poor, carrier immanent structure will not be damaged, remain the mechanical characteristic of carrier in itself, do not interfere with material
Bulk properties；In addition, the cost of ultraviolet radiation equipment is low, it is simple to operate；It is simple with technique, easily operation, mild condition,
Equipment investment is few, beneficial to realizing industrialized advantage.
2) acrylic acid (modifying agent) is grafted to Polyurethane carrier surface by the present invention in a manner of covalent bond, and connection is very steady
It is fixed, it is difficult for drop-off, it can use for a long time；Acrylic acid contains carboxyl, has good hydrophily and reactivity, can not only change
The hydrophily of kind Polyurethane carrier, while can also be reacted by the strong reactivity of carboxyl with functional compound, carry out secondary
Grafting and modifying.
3) in the prior art, uv photo initiated grafting is acrylic acid modified is mainly used in the hydrophily for improving membrane material surface, improves
Its contamination resistance, but general grafted monomers concentration is relatively low, otherwise can reduce the aperture of film after grafting, influence the rejection of film
And flux.The present invention is applied to the modification of polyurethane foam carrier surface, it is not necessary to the problem of considering to block fenestra, therefore, connects
Branch monomer concentration can increase many times, and grafting efficiency greatly improves；Meanwhile modified carrier be applied to sewage disposal can be with
Ammonia nitrogen and COD are removed, for an innovative point of Polyurethane carrier application.
4) acrylic acid used in the present invention contains double bond and carboxyl isoreactivity group, passes through under the conditions of ultraviolet radiation
Radical reaction is grafted in a manner of covalent bond on Polyurethane carrier surface, it will be apparent that is improved its hydrophily, is advantageous to micro- life
The absorption and fixation of thing, with a kind of patent " immobilized microorganism technology for biological reinforced processing trade effluent " (application number
201210154814.1) compare, the present invention has the characteristics that reaction is fast, technological operation is simple, and the penetration capacity of ultraviolet light
Very little is influenceed on the bulk properties of Polyurethane carrier compared with official post radiative process.
Brief description of the drawings
The present invention has drawings described below：
Fig. 1 is uv photo initiated grafting acrylic acid in Polyurethane carrier surface and carries out microbial immobilized flow and principle signal
Figure.
Fig. 2 is the uv photo initiated grafting electron microscope contrast of Polyurethane carrier absorption microorganism afterwards before modified in embodiment 1.
Embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
Material used, reagent etc., unless otherwise specified, are commercially obtained in following embodiments.
The preparation method of Polyurethane carrier used is as follows in following embodiments：
Isocyanates and PEPA are taken at room temperature according to 100：46 ratio mixing, is placed in agitator, 800rpm
Stirred under rotating speed, place and wait its foaming and intumescing and curing molding, be cut into 2-3cm cubic block, be placed in baking oven, 60 DEG C
It is dried for standby.It is required that polyurethane foam (i.e. Polyurethane carrier) specific surface area after foaming is more than 1000, porosity is more than 96%.
It is specific as follows to the characterizing method of the Polyurethane carrier of hydrophilic modifying in following embodiments：
Contact angle uses instrument direct measurement reading, and instrument is DSA100 contact angle measurements,
Electron microscope uses testing electronic microscope, and instrument is Hitachi S-4800 cold field emission ESEMs.
Ultraviolet light generating apparatus used is long arc mercury lamp light source in following embodiments, model PLS-LAM500, is produced
Business is Beijing Bo Feilai Science and Technology Ltd.s.Actinograph device is ultraviolet light intensity meter (UV-A types), Beijing Normal University's optics
Instrument plant produces.
The solvent of acrylic acid solution used in following embodiments is acetone.
% in following embodiments is weight/mass percentage composition unless otherwise instructed.
Step a and step b is carried out under the conditions of normal temperature (i.e. 20-25 DEG C) in following embodiments.
Embodiment 1：
1st, uv photo initiated grafting acrylic acid modified polyurethane carrier (as shown in Figure 1)
Step a：The cube Polyurethane carrier that the length of side is 2cm is immersed in the methanol solution of 0.2mol/L benzophenone
In, taken out after soaking 2h, naturally dry is stand-by；
Step b：Polyurethane carrier after step a processing is put into ultraviolet light generating apparatus, immerses 15% propylene
In acid solution, taken out after ultraviolet radiation 30min, be placed in washes clean in distilled water, that is, the polyurethane for obtaining hydrophilic modifying carries
Body.
2nd, characterization result
By before and after hydrophilic modifying in step 1 Polyurethane carrier carry out contact angle detection, as a result respectively 116 ° and 71 °,
Polyurethane carrier contact angle after hydrophilic modifying is decreased obviously, and hydrophily improves notable.
3rd, it is microbial immobilized
Step 1 is obtained to carry out bio-film colonization experiment in the Polyurethane carrier input aerobic reaction tank of hydrophilic modifying, it is aerobic
Reaction tank sludge concentration is 2.6g/L, under abundant aeration situation, it is only necessary to 4d can complete the biofilm of carrier surface and inside, Gu
It is 2.03g/g (biomass/carrier amount) to determine biomass；Compared with the control, fixed biomass can improve 35%.Step 1 is ultraviolet
The electron microscope contrast of Polyurethane carrier absorption microorganism is as shown in Figure 2 before and after graft modification.
Control：Polyurethane carrier without step 1 processing, which completes carrier surface and the biofilm of inside, needs 6 days, fixed life
Object amount is 1.5g/g (biomass/carrier amount).
4th, sewage disposal
The chemical engineering sewage that certain COD is 780mg/L, ammonia nitrogen is 100mg/L is taken to be carried out as the water inlet of step 3 aerobic reaction tank
Sewage disposal, treatment conditions are as follows：Sludge concentration 2g/L, residence time 9h, dissolved oxygen 4mg/L, the loading of Polyurethane carrier
For the 50% of aerobic reaction tank volume；Detect aerobic reaction tank water outlet COD and ammonia-nitrogen content.
As a result：Water outlet COD is less than 80mg/L, and ammonia nitrogen is less than 1mg/L；More than 94% can be reached to COD clearance, ammonia
The clearance of nitrogen reaches more than 99%.Using the water outlet by the Polyurethane carrier without step 1 processing that step 3 is handled as control
COD clearance is 85%, and the clearance of ammonia nitrogen is 93%.
Embodiment 2：
1st, uv photo initiated grafting acrylic acid modified polyurethane carrier
Step a：The cube Polyurethane carrier that the length of side is 3cm is immersed in 0.5mol/L 2,4 dihydroxyl benzophenone
Ethanol solution in, soak 1h after take out, naturally dry is stand-by；
Step b：Polyurethane carrier after step a processing is put into ultraviolet light generating apparatus, immerses 20% propylene
In acid solution, taken out after ultraviolet radiation 10min, be placed in washes clean in distilled water, that is, the polyurethane for obtaining hydrophilic modifying carries
Body.
2nd, characterization result
By before and after hydrophilic modifying in step 1 Polyurethane carrier carry out contact angle detection, as a result respectively 118 ° and 63 °,
Polyurethane carrier contact angle after hydrophilic modifying is decreased obviously, and hydrophily improves notable.
3rd, it is microbial immobilized
Step 1 is obtained to carry out bio-film colonization experiment in the Polyurethane carrier input aerobic reaction tank of hydrophilic modifying, it is aerobic
Reaction tank sludge concentration is 3.2g/L, under abundant aeration situation, it is only necessary to 3d can complete the biofilm of carrier surface and inside, Gu
It is 2.48g/g (biomass/carrier amount) to determine biomass；Compared with the control, fixed biomass can improve 55%.
Control：Polyurethane carrier without step 1 processing, which completes carrier surface and the biofilm of inside, needs 5 days, fixed life
Object amount is 1.6g/g (biomass/carrier amount).
4th, sewage disposal
The chemical engineering sewage that certain COD is 800mg/L, ammonia nitrogen is 90mg/L is taken to be carried out as the water inlet of step 3 aerobic reaction tank
Sewage disposal, treatment conditions are as follows：Sludge concentration 2g/L, residence time 9h, dissolved oxygen 4mg/L, the loading of Polyurethane carrier
For the 50% of aerobic reaction tank volume；Detect aerobic reaction tank water outlet COD and ammonia-nitrogen content.
As a result：Water outlet COD is less than 80mg/L, and ammonia nitrogen is less than 1mg/L；More than 95% can be reached to COD clearance, ammonia
The clearance of nitrogen reaches more than 99%.Using the water outlet by the Polyurethane carrier without step 1 processing that step 3 is handled as control
COD clearance is 86%, and the clearance of ammonia nitrogen is 92%.
Embodiment 3：
1st, uv photo initiated grafting acrylic acid modified polyurethane carrier
Step a：The ethanol for the benzophenone that the cube Polyurethane carrier that the length of side is 2.5cm is immersed in into 0.5mol/L is molten
In liquid, taken out after soaking 1.5h, naturally dry is stand-by；
Step b：Polyurethane carrier after step a processing is put into ultraviolet light generating apparatus, immerses 18% propylene
In acid solution, taken out after ultraviolet radiation 20min, be placed in washes clean in distilled water, that is, the polyurethane for obtaining hydrophilic modifying carries
Body.
2nd, characterization result
By before and after hydrophilic modifying in step 1 Polyurethane carrier carry out contact angle detection, as a result respectively 117 ° and 60 °,
Polyurethane carrier contact angle after hydrophilic modifying is decreased obviously, and hydrophily improves notable.
3rd, it is microbial immobilized
Step 1 is obtained to carry out bio-film colonization experiment in the Polyurethane carrier input aerobic reaction tank of hydrophilic modifying, it is aerobic
Reaction tank sludge concentration is 3.5g/L, under abundant aeration situation, it is only necessary to 3d can complete the biofilm of carrier surface and inside, Gu
It is 2.56g/g (biomass/carrier amount) to determine biomass；Compared with the control, fixed biomass can improve 60%.
Control：Polyurethane carrier without step 1 processing, which completes carrier surface and the biofilm of inside, needs 5 days, fixed life
Object amount is 1.6g/g (biomass/carrier amount).
4th, sewage disposal
The chemical engineering sewage that certain COD is 700mg/L, ammonia nitrogen is 80mg/L is taken to be carried out as the water inlet of step 3 aerobic reaction tank
Sewage disposal, treatment conditions are as follows：Sludge concentration 2g/L, residence time 9h, dissolved oxygen 4mg/L, the loading of Polyurethane carrier
For the 50% of aerobic reaction tank volume；Detect aerobic reaction tank water outlet COD and ammonia-nitrogen content.
As a result：Water outlet COD is less than 80mg/L, and ammonia nitrogen is less than 1mg/L；More than 96% can be reached to COD clearance, ammonia
The clearance of nitrogen reaches more than 99%.Using the water outlet by the Polyurethane carrier without step 1 processing that step 3 is handled as control
COD clearance is 87%, and the clearance of ammonia nitrogen is 92%.
Embodiment 4：
1st, uv photo initiated grafting acrylic acid modified polyurethane carrier
Step a：The cube Polyurethane carrier that the length of side is 3cm is immersed in 0.2mol/L 2,4 dihydroxyl benzophenone
Methanol solution in, soak 1.3h after take out, naturally dry is stand-by；
Step b：Polyurethane carrier after step a processing is put into ultraviolet light generating apparatus, immerses 17% propylene
In acid solution, taken out after ultraviolet radiation 16min, be placed in washes clean in distilled water, that is, the polyurethane for obtaining hydrophilic modifying carries
Body.
2nd, characterization result
By before and after hydrophilic modifying in step 1 Polyurethane carrier carry out contact angle detection, as a result respectively 116 ° and 67 °,
Polyurethane carrier contact angle after hydrophilic modifying is decreased obviously, and hydrophily improves notable.
3rd, it is microbial immobilized
Step 1 is obtained to carry out bio-film colonization experiment in the Polyurethane carrier input aerobic reaction tank of hydrophilic modifying, it is aerobic
Reaction tank sludge concentration is 3g/L, under abundant aeration situation, it is only necessary to which 4d can complete the biofilm of carrier surface and inside, fixed
Biomass is 2.35g/g (biomass/carrier amount)；Compared with the control, fixed biomass can improve 38%.
Control：Polyurethane carrier without step 1 processing, which completes carrier surface and the biofilm of inside, needs 5 days, fixed life
Object amount is 1.7g/g (biomass/carrier amount).
4th, sewage disposal
The chemical engineering sewage that certain COD is 750mg/L, ammonia nitrogen is 90mg/L is taken to be carried out as the water inlet of step 3 aerobic reaction tank
Sewage disposal, treatment conditions are as follows：Sludge concentration 2g/L, residence time 9h, dissolved oxygen 4mg/L, the loading of Polyurethane carrier
For the 50% of aerobic reaction tank volume；Detect aerobic reaction tank water outlet COD and ammonia-nitrogen content.
As a result：Water outlet COD is less than 80mg/L, and ammonia nitrogen is less than 1mg/L；More than 93% can be reached to COD clearance, ammonia
The clearance of nitrogen reaches more than 99%.Using the water outlet by the Polyurethane carrier without step 1 processing that step 3 is handled as control
COD clearance is 83%, and the clearance of ammonia nitrogen is 91%.
Embodiment 5：
1st, uv photo initiated grafting acrylic acid modified polyurethane carrier
Step a：The cube Polyurethane carrier that the length of side is 2.7cm is immersed in the methanol of 0.35mol/L benzophenone
In solution, taken out after soaking 1.7h, naturally dry is stand-by；
Step b：Polyurethane carrier after step a processing is put into ultraviolet light generating apparatus, immerses 19% propylene
In acid solution, taken out after ultraviolet radiation 24min, be placed in washes clean in distilled water, that is, the polyurethane for obtaining hydrophilic modifying carries
Body.
2nd, characterization result
By before and after hydrophilic modifying in step 1 Polyurethane carrier carry out contact angle detection, as a result respectively 118 ° and 66 °,
Polyurethane carrier contact angle after hydrophilic modifying is decreased obviously, and hydrophily improves notable.
3rd, it is microbial immobilized
Step 1 is obtained to carry out bio-film colonization experiment in the Polyurethane carrier input aerobic reaction tank of hydrophilic modifying, it is aerobic
Reaction tank sludge concentration is 3g/L, under abundant aeration situation, it is only necessary to 3.5d can complete the biofilm of carrier surface and inside, Gu
It is 2.29g/g (biomass/carrier amount) to determine biomass；Compared with the control, fixed biomass can improve 43%.
Control：Polyurethane carrier without step 1 processing, which completes carrier surface and the biofilm of inside, needs 5 days, fixed life
Object amount is 1.6g/g (biomass/carrier amount).
4th, sewage disposal
The chemical engineering sewage that certain COD is 900mg/L, ammonia nitrogen is 95mg/L is taken to be carried out as the water inlet of step 3 aerobic reaction tank
Sewage disposal, treatment conditions are as follows：Sludge concentration 2g/L, residence time 9h, dissolved oxygen 4mg/L, the loading of Polyurethane carrier
For the 50% of aerobic reaction tank volume；Detect aerobic reaction tank water outlet COD and ammonia-nitrogen content.
As a result：Water outlet COD is less than 80mg/L, and ammonia nitrogen is less than 1mg/L；More than 95% can be reached to COD clearance, ammonia
The clearance of nitrogen reaches more than 99%.Using the water outlet by the Polyurethane carrier without step 1 processing that step 3 is handled as control
COD clearance is 84%, and the clearance of ammonia nitrogen is 92%.
Embodiment 6：
1st, uv photo initiated grafting acrylic acid modified polyurethane carrier
Step a：The cube Polyurethane carrier that the length of side is 2.4cm is immersed in 0.35mol/L 2,4- dihydroxy hexichol
In the methanol solution of ketone, taken out after soaking 1.8h, naturally dry is stand-by；
Step b：Polyurethane carrier after step a processing is put into ultraviolet light generating apparatus, immerses 16% propylene
In acid solution, taken out after ultraviolet radiation 27min, be placed in washes clean in distilled water, that is, the polyurethane for obtaining hydrophilic modifying carries
Body.
2nd, characterization result
By before and after hydrophilic modifying in step 1 Polyurethane carrier carry out contact angle detection, as a result respectively 118 ° and 66 °,
Polyurethane carrier contact angle after hydrophilic modifying is decreased obviously, and hydrophily improves notable.
3rd, biology is carried out in the microbial immobilized Polyurethane carrier input aerobic reaction tank that step 1 is obtained to hydrophilic modifying
Biofilm is tested, and aerobic reaction tank aerobic reaction tank sludge concentration is 2.5g/L, under abundant aeration situation, it is only necessary to which 3.5d can be complete
Into carrier surface and the biofilm of inside, fixed biomass is 2.48g/g (biomass/carrier amount)；Compared with the control, fixed biology
Amount can improve 45%.
Control：Polyurethane carrier without step 1 processing, which completes carrier surface and the biofilm of inside, needs 5 days, fixed life
Object amount is 1.7g/g (biomass/carrier amount).
4th, sewage disposal
The chemical engineering sewage that certain COD is 860mg/L, ammonia nitrogen is 90mg/L is taken to be carried out as the water inlet of step 3 aerobic reaction tank
Sewage disposal, treatment conditions are as follows：Sludge concentration 2g/L, residence time 9h, dissolved oxygen 4mg/L, the loading of Polyurethane carrier
For the 50% of aerobic reaction tank volume；Detect aerobic reaction tank water outlet COD and ammonia-nitrogen content.
As a result：Water outlet COD is less than 80mg/L, and ammonia nitrogen is less than 1mg/L；More than 95% can be reached to COD clearance, ammonia
The clearance of nitrogen reaches more than 99%.Using the water outlet by the Polyurethane carrier without step 1 processing that step 2 is handled as control
COD clearance is 84%, and the clearance of ammonia nitrogen is 90%.
The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (10)
1. a kind of preparation method of uv photo initiated grafting acrylic acid modified polyurethane carrier, comprises the following steps：
Step 1：Polyurethane carrier is placed in into reaction to trigger in solution after immersion, takes out drying；It is light that the reaction, which triggers solution,
Quick dose of alcoholic solution；
Step 2：After carrying out ultraviolet radiation in the dried Polyurethane carrier immersion acrylic acid solution that step 1 is obtained, take
Go out clean, obtain the Polyurethane carrier of hydrophilic modifying.
2. preparation method as claimed in claim 1, it is characterised in that sensitising agent described in step 1 is benzophenone or 2,4-
Dihydroxy benaophenonel；
And/or it is 0.1-0.8mol/L, preferably 0.2-0.5mol/ that the sensitising agent triggers the concentration in solution in the reaction
L；
And/or the reaction triggers solution as the methanol solution of the sensitising agent or the ethanol solution of the sensitising agent.
3. preparation method as claimed in claim 1 or 2, it is characterised in that the Polyurethane carrier used in step 1 is the length of side
2-3cm cube；
And/or the Polyurethane carrier used in step 1 is expansion type Polyurethane carrier.
4. preparation method as claimed in claim 1 or 2, it is characterised in that the time soaked described in step 1 is 1-2h.
5. preparation method as claimed in claim 1 or 2, it is characterised in that acrylic acid solution concentration described in step 2 is
10%-25%, preferably 15%-20%.
6. preparation method as claimed in claim 1 or 2, it is characterised in that the time of ultraviolet radiation described in step 2 is
10-30min。
7. the Polyurethane carrier for the hydrophilic modifying that any preparation method obtains in claim 1-6.
8. application of the Polyurethane carrier of hydrophilic modifying described in claim 7 in microbial immobilized.
9. application of the Polyurethane carrier of hydrophilic modifying described in claim 7 in sewage disposal.
10. application as claimed in claim 9, it is characterised in that the purpose of the sewage disposal include it is following a) or b) in
It is at least one：
A) the COD contents of the sewage are reduced；
B) ammonia-nitrogen content of the sewage is reduced.
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| CN109126896A (en) * | 2018-09-18 | 2019-01-04 | 河南工业大学 | It is a kind of to prepare g-C3N4With the method for carbon fiber complex carrier |
| CN109126896B (en) * | 2018-09-18 | 2021-04-27 | 河南工业大学 | Preparation of g-C3N4And carbon fiber composite carrier |
| CN111186909A (en) * | 2020-01-24 | 2020-05-22 | 辽宁中舟得水环保科技有限公司 | Method for treating epoxypropane wastewater by efficient anaerobic process |
| CN111186909B (en) * | 2020-01-24 | 2022-01-04 | 辽宁中舟得水环保科技有限公司 | Method for treating epoxypropane wastewater by efficient anaerobic process |
| CN113185644A (en) * | 2021-04-23 | 2021-07-30 | 清华大学 | Preparation method of photo-grafting thermal reversible crosslinked polyurethane |
| CN113185644B (en) * | 2021-04-23 | 2022-09-09 | 清华大学 | Preparation method of photo-grafting thermal reversible crosslinked polyurethane |
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Application publication date: 20180119 |