CN109772175A - A kind of screening technique of film properties major influence factors - Google Patents
A kind of screening technique of film properties major influence factors Download PDFInfo
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- CN109772175A CN109772175A CN201811642961.7A CN201811642961A CN109772175A CN 109772175 A CN109772175 A CN 109772175A CN 201811642961 A CN201811642961 A CN 201811642961A CN 109772175 A CN109772175 A CN 109772175A
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Abstract
The present invention relates to a kind of screening techniques of film properties major influence factors in the field plate MBR.The screening technique include: (1) determine the membrane flux of MBR, film resistance tocrocking influence factor be film thickness, film critical flux, contact angle, membrane aperture distribution and filter membrane resistance；(2) number of levels of influence factor is determined；(3) number of levels that will affect factor is inserted in orthogonal arrage according to the case where actually occurring, and establishes simulation orthogonal arrage；(4) simulation orthogonal arrage is compared with typical orthogonal arrage, analyzes the typicalness of real data；(5) orthogonal calculation is carried out to simulation orthogonal arrage, by the primary and secondary sequence for counting each influence factor of pole differential analysis.The present invention further defines the fast appraisement method of PVDF plate membrane membrane flux.The present invention carries out quadrature analysis using actual operating data, as a result more true and reliable instead of theoretical hypothesis data model；Meanwhile the detection frequency of minor effect factor is reduced, the efficiency for inspecting film by random samples significantly improves.
Description
Technical field
The present invention relates to plate membrane bioreactor fields, and in particular to a kind of screening side of film properties major influence factors
Method.
Background technique
PVDF flat plate ultrafiltration membrane is compared with other ultrafiltration membrane products, good, the easy to clean, resistance tocrocking with effluent quality
The advantages such as strong.In coming few decades, domestic ultrafiltration plate membrane market application prospect is wide.
There is common film properties index in the detection of film properties of product: film liquid viscosity, film pure water flux, membrane flux, membrane aperture,
Membrane porosity, film thickness, film contact angle, membrane resistance, film mechanical strength, film surface pore-size distribution, the distribution of film photoscope, membrane element element
Composition and ratio, retaining molecular weight, the pollution recovery rate of film and antifouling property etc..Currently used for measuring the country of film properties
Have with professional standard:
(1) " ultrafiltration membrane test method (pure water flux, molecular weight cut off and rejection) " GBT
32360-2015
(2) " seperation film opening size test method-bubble point and average discharge method " GBT 32361-2015
(3) " membrane aperture performance measurement method gas permeates Vesicular protein (exposure draft) "
(4) " sewage treatment film bioreactor device " HGT 3917-2006
(5) " membrane biological process sewage disposal technology specification " HJ2010-2011 standard
(6) " membrane bioreactor sewage treatment project technical specification (exposure draft) "
(7) " environmental protection product technical requirements hollow-fiber membrane bioreactor group device (consults on
Original text) "
(8) " environmental protection product technical requirements membrane bioreactor (exposure draft) "
But during PVDF ultrafiltration membrane development and application, because film properties of product Testing index is various, detection process work
It measures huge, takes time and effort.Therefore, it is necessary to be further simplified film properties index quantity, working efficiency is improved.
Summary of the invention
In view of the deficiencies of the prior art, the object of the present invention is to overcome film properties evaluation procedure in the prior art numerous
Trivial problem provides a kind of screening technique of film properties major influence factors.Specific technical solution is as follows:
A kind of screening technique of film properties major influence factors, includes the following steps:
(1) membrane flux of membrane bioreactor is determined, the influence factor of the resistance tocrocking of film is film thickness, film is critical logical
Amount, contact angle, membrane aperture distribution and filter membrane resistance, ignore the influence of other secondary causes；
(2) in magnitude order, close data are averaged the actual value of above-mentioned influence factor, by actual operation data
It is abstracted as mathematical model, determines the number of levels of influence factor；
(3) number of levels of above-mentioned influence factor is inserted in orthogonal arrage according to the case where actually occurring, membrane flux and film
The screening of the major influence factors of resistance tocrocking respectively using the real fluxes of film and actual motion period as investigating as a result,
The operation data of shared P batch establishes simulation orthogonal arrage Ln(mk)；
(4) orthogonal arrage L will be simulatedn(mk) and typical Ln(mk) orthogonal arrage comparison, analyze the typicalness of real data；
(5) orthogonal calculation is carried out to simulation orthogonal arrage, by the primary and secondary sequence for counting each influence factor of pole differential analysis.
Further, the Ln(mk) basis of orthogonal trial is: n is the line number of table, represents test number (TN), n value model
Enclosing is 0-50000；M is the number of levels of each factor, and m value range is 1-5000；K is table midrange, indicates of influence factor
Number, k value range is 0-500；The value range of P is 0-2000.
Further, the screening technique be suitable for one of plate membrane, rolled film, tubular membrane or ceramic membrane or
It is several, while one of applying also for microfiltration membranes, ultrafiltration membrane or nanofiltration membrane or several.
Further, the film properties include two aspect of resistance tocrocking of membrane flux and film, the main influences of film properties because
Element is contact angle and critical flux.
Further, the film is PVDF flat plate ultrafiltration membrane, and the influence degree of major influence factors contact angle, which is greater than, faces
Boundary's flux.
A kind of fast appraisement method of film properties, the film properties major influence factors of above-mentioned screening are in practical optimum level
When being worth in range, the performance of film product is preferable.
A kind of fast appraisement method of PVDF flat plate ultrafiltration membrane film properties, the evaluation method is according to above-mentioned screened PVDF
Flat plate ultrafiltration membrane film properties major influence factors, specifically comprise the following steps:
(1) in actual membrane production process, guarantee film thickness and film liquid viscosity in range of normal value, to guarantee that filter membrane hinders
Basis of the power in range of normal value, as film properties Fast Evaluation；
(2) for PVDF flat plate ultrafiltration membrane product to be checked, the contact angle of direct analyzing film, if contact angle is practical best
Within the scope of level value, then continue the critical flux of analyzing film；If contact angle within the scope of practical sub-optimal level value, does not continue point
Film critical flux index is analysed, the low-flux membrane product of lower antifouling property is obtained；
(3) when contact angle is within the scope of practical optimum level value, then continue the critical flux of analyzing film；If critical flux exists
Within the scope of practical optimum level value, then the film product of higher resistance tocrocking higher flux is obtained；If critical flux is practical sub-optimal
Within the scope of level value, then the film product of the lower flux of higher resistance tocrocking is obtained.
Further, the practical optimum level value of the contact angle of the PVDF flat plate ultrafiltration membrane is 40 ° -80 °, critical flux
Practical optimum level value be 30-60LMH, the practical optimum level value of film thickness is 190-250 μm, and the reality of filter membrane resistance is most
Good level value is 1.50-2.50E+11*m-1。
Technical solution of the present invention has the advantages that
1. a kind of screening technique of film properties major influence factors provided by the invention is by establishing statistics orthogonal model
Actual membrane bioreactor (MBR) operation data is analyzed, each film properties influence factor is then determined using quadrature analysis
Precedence；The major influence factors of identified film properties are determined by the practical operation situation and operating condition of film, without
It is simple theory deduction result；This method is scientific and reasonable, convenient to use；
2. a kind of screening technique of film properties major influence factors provided by the invention innovatively uses actual motion number
It is as a result more true and reliable instead of original theoretical hypothesis data model according to progress statistics quadrature analysis.Meanwhile the sieve
Choosing method can be used for the performance evaluation of any membrane material, and the scope of application is than wide.
3. present invention determine that the major influence factors of PVDF flat plate ultrafiltration membrane film properties are contact angle and critical flux, and
The fast appraisement method of PVDF flat plate ultrafiltration membrane film properties is determined, this method enormously simplifies the work of film properties detection and analysis
Amount can reduce the detection frequency of minor effect factor, improve concern and analysis to major influence factors, therefore help to mention
The working efficiency of high film sampling observation.
Detailed description of the invention
It, below will be in specific embodiment in order to illustrate more clearly of the technical solution in the specific embodiment of the invention
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiment party of the invention
Formula without creative efforts, can also obtain according to these attached drawings for those of ordinary skill in the art
Obtain other attached drawings.
Fig. 1 is a kind of flow chart of the screening technique of film properties major influence factors of the present invention.
Fig. 2 is a kind of flow chart of the fast appraisement method of PVDF flat plate ultrafiltration membrane film properties of the present invention.
Specific embodiment
There is provided following embodiments is to preferably further understand the present invention, it is not limited to the best embodiment party
Formula is not construed as limiting the contents of the present invention and protection scope, anyone under the inspiration of the present invention or by the present invention and its
The feature of his prior art is combined and any and identical or similar product of the present invention for obtaining, all falls within of the invention
Within protection scope.
Specific experiment step or condition person are not specified in embodiment, according to the literature in the art described routine experiment
The operation of step or condition can carry out.Reagents or instruments used without specified manufacturer, being can be by commercially available acquisition
Conventional reagent product.
The screening of embodiment 1:PVDF flat plate ultrafiltration membrane film properties major influence factors
PVDF flat plate ultrafiltration membrane membrane flux size, film resistance tocrocking major influence factors screening, flow chart as scheme
1, include the following steps:
(1) determine MBR reactor membrane flux, film resistance tocrocking influence factor be film thickness, film critical flux, contact
Angle, membrane aperture distribution and filter membrane resistance, ignore the influence of other secondary causes；The performance parameter and operation of PVDF flat plate ultrafiltration membrane
Period is as shown in table 1.
The performance parameter of table 1.PVDF flat plate ultrafiltration membrane and the cycle of operation
(2) in magnitude order, close data are averaged the actual value of above-mentioned influence factor, by actual operation data
It is abstracted as mathematical model, determines the number of levels of influence factor；The influence factor and horizontal bar of the film properties of PVDF flat plate ultrafiltration membrane
Divide as shown in table 2.
The influence factor and horizontal division of table 2.PVDF flat plate ultrafiltration membrane film properties
(3) number of levels of above-mentioned influence factor is inserted in orthogonal arrage according to the case where actually occurring, membrane flux and film
The screening of the major influence factors of resistance tocrocking respectively using the real fluxes of film and actual motion period as investigating as a result,
The operation data of 6 batches is shared, simulation orthogonal arrage L is establishedn(mk)；Wherein Ln(mk) basis of orthogonal trial is that n is table
Line number, represent test number (TN), n value range is 0-50000；M is the number of levels of each factor, and m value range is 1-5000；k
It is table midrange, indicates that the number of influence factor, k value range are 0-500；Simulate L9(34) orthogonal arrage design scheme such as table 3
Shown, the actual operation parameters of MBR reactor are as shown in table 4.
Table 3. simulates L9(34) orthogonal arrage design scheme
The actual operation parameters of table 4.MBR reactor
The water outlet of MBR reactor meets GB 18918-2002 " urban wastewater treatment firm pollutant emission standard " level-one mark
It is quasi-.
It (4) will simulation orthogonal arrage and typical Ln(mk) orthogonal arrage comparison, analyze the typicalness of real data；Typical L9
(34) orthogonal arrage design scheme it is as shown in table 5.
5. typical case L of table9(34) orthogonal arrage design scheme
By table 4 and table 5 it is found that the difference of simulation orthogonal arrage and typical Orthogonal table is larger, the diaphragm for testing selection does not have
There is typical representative, and is only the film formulation that may have preferable film properties.Therefore, the investigation data tool of four influence factors
There is biggish repeatability, concentrates in some preferable range.This shows that this is simulated the result of orthogonal table analysis and has not had
Whole property is only used for can determine the relatively strong and weak of four influence factors in the smaller range of specific investigation.But it is if complete
The influence degree of each factor is analyzed on ground, determines accurate optimum level range, it is necessary to be established by completion missing data typical
Orthogonal table analysis.
(5) orthogonal calculation is carried out to simulation orthogonal arrage, by the primary and secondary sequence for counting each influence factor of pole differential analysis.
It is enumerated by taking average pure water flux as an example as shown in table 6, simulation orthogonal arrage Comprehensive analysis results are as shown in table 7.
6. pole differential analysis of table
It is comprehensive that table 7. simulates orthogonal table analysis result
The first and second batches are compared, the sequence of four influence factors is identical, and the value of optimum level meets experience
Value.Since third batch, the sequence of influence factor is changed greatly, and the influence of film thickness is highlighted.Compare the 4th and
Five batches, each influence factor generate large change to the influence degree of experimental result, when influence degree and actual deviation are larger,
Then tentatively judge whether this group of data there are abnormal conditions, while whether considering the influence of secondary cause.
According to the theoretical theoretical optimum level value calculated when determining that membrane flux is not less than 25LMH respectively with industry average level
With practical optimum level value, as shown in table 8.
8. membrane flux of table is not less than optimum level value when 25LMH
The analog result of six lot datas of comprehensive analysis, it was therefore concluded that:
1. critical flux and contact angle be PVDF flat plate ultrafiltration membrane membrane flux, film resistance tocrocking major influence factors.
When two factors take optimum value, it is likely to obtain the film product of optimum performance.When one of factor is unfavorable, membrane flux meeting
It reduces, and the influence degree of contact angle is greater than critical flux.When practical membrane flux is 25LMH, ideal film is critical logical
Amount is 30-60LMH.
2. film thickness is the minor effect factor of membrane flux, there is active influence to film real fluxes, so should weigh
Depending on the selection of film thickness and the precision of raising knifing.
3. the sequence regardless of influence factor changes, the value of optimum level is substantially stationary, therefore can be by this result
For in film random inspection of products quality, for deviating considerably from the value of optimum level, it should recheck, recheck underproof, give up and do not have to.
The fast appraisement method of embodiment 2:PVDF flat plate ultrafiltration membrane film properties
The fast appraisement method (flow chart is as shown in Figure 2) of PVDF flat plate ultrafiltration membrane film properties, includes the following steps:
(1) in actual membrane production process, guarantee film thickness and film liquid viscosity in range of normal value, to guarantee that filter membrane hinders
Basis of the power in range of normal value, as PVDF flat plate ultrafiltration membrane film properties Fast Evaluation；
(2) for PVDF flat plate ultrafiltration membrane product to be checked, the contact angle of direct analyzing film, if contact angle is practical best
Within the scope of level value, then continue the critical flux of analyzing film；If contact angle within the scope of practical sub-optimal level value, does not continue point
Film critical flux index is analysed, the low-flux membrane product of lower antifouling property is obtained；
(3) when contact angle is within the scope of practical optimum level value, then continue the critical flux of analyzing film；If critical flux exists
Within the scope of practical optimum level value, then the film product of higher resistance tocrocking higher flux is obtained；If critical flux is practical sub-optimal
Within the scope of level value, then the film product of the lower flux of higher resistance tocrocking is obtained.
Contact angle, critical flux, film thickness, the practical optimum level value of filter membrane resistance are as shown in table 9.
The practical optimum level value of 9. film properties of table
Claims (8)
1. a kind of screening technique of film properties major influence factors, which comprises the steps of:
(1) membrane flux of membrane bioreactor is determined, the influence factor of the resistance tocrocking of film is film thickness, film critical flux, connects
Feeler, membrane aperture distribution and filter membrane resistance, ignore the influence of other secondary causes；
(2) in magnitude order, close data are averaged the actual value of above-mentioned influence factor, and actual operation data is abstracted
For mathematical model, the number of levels of influence factor is determined；
(3) number of levels of above-mentioned influence factor is inserted in orthogonal arrage according to the case where actually occurring, the anti-pollution of membrane flux and film
The screening of the major influence factors of metachromia is respectively using the real fluxes of film and actual motion period as investigation as a result, shared
The operation data of P batch establishes simulation orthogonal arrage Ln(mk)；
(4) orthogonal arrage L will be simulatedn(mk) and typical Ln(mk) orthogonal arrage comparison, analyze the typicalness of real data；
(5) orthogonal calculation is carried out to simulation orthogonal arrage, by the primary and secondary sequence for counting each influence factor of pole differential analysis.
2. screening technique according to claim 1, which is characterized in that the Ln(mk) basis of orthogonal trial is that: n is
The line number of table, represents test number (TN), and n value range is 0-50000；M is the number of levels of each factor, and m value range is 1-5000；
K is table midrange, indicates that the number of influence factor, k value range are 0-500；The value range of P is 0-2000.
3. screening technique according to claim 1, which is characterized in that the screening technique be suitable for plate membrane, rolled film,
One of tubular membrane or ceramic membrane are perhaps several while one of applying also for microfiltration membranes, ultrafiltration membrane or nanofiltration membrane
Or it is several.
4. screening technique according to claim 1, which is characterized in that the film properties include the antipollution of membrane flux and film
Property two aspect, the major influence factors of film properties are contact angle and critical flux.
5. screening technique according to claim 4, which is characterized in that the film is PVDF flat plate ultrafiltration membrane, main shadow
The influence degree for ringing factor contact angle is greater than critical flux.
6. a kind of fast appraisement method of film properties, which is characterized in that the film properties major influence factors that claim 4 is screened
When within the scope of practical optimum level value, the performance of film product is preferable.
7. a kind of fast appraisement method of PVDF flat plate ultrafiltration membrane film properties, which is characterized in that the evaluation method is wanted according to right
The 5 PVDF flat plate ultrafiltration membrane film properties major influence factors screened are sought, are specifically comprised the following steps:
(1) in actual membrane production process, guarantee film thickness and film liquid viscosity in range of normal value, to guarantee that filter membrane resistance exists
Basis in range of normal value, as film properties Fast Evaluation；
(2) for PVDF flat plate ultrafiltration membrane product to be checked, the contact angle of direct analyzing film, if contact angle is in practical optimum level
It is worth in range, then continues the critical flux of analyzing film；If contact angle does not continue analyzing film within the scope of practical sub-optimal level value
Critical flux index obtains the low-flux membrane product of lower antifouling property；
(3) when contact angle is within the scope of practical optimum level value, then continue the critical flux of analyzing film；If critical flux is in reality
Within the scope of optimum level value, then the film product of higher resistance tocrocking higher flux is obtained；If critical flux is in practical sub-optimal level
It is worth in range, then obtains the film product of the lower flux of higher resistance tocrocking.
8. fast appraisement method according to claim 7, which is characterized in that the contact angle of the PVDF flat plate ultrafiltration membrane
Practical optimum level value is 40 ° -80 °, and the practical optimum level value of critical flux is 30-60LMH, the best water of the reality of film thickness
Level values are 190-250 μm, and the practical optimum level value of filter membrane resistance is 1.50-2.50E+11*m-1。
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