CN117771956A - Film testing method - Google Patents
Film testing method Download PDFInfo
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- CN117771956A CN117771956A CN202311801454.4A CN202311801454A CN117771956A CN 117771956 A CN117771956 A CN 117771956A CN 202311801454 A CN202311801454 A CN 202311801454A CN 117771956 A CN117771956 A CN 117771956A
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- cleaning
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- 238000012360 testing method Methods 0.000 title claims abstract description 91
- 239000012528 membrane Substances 0.000 claims abstract description 91
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000001914 filtration Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000011084 recovery Methods 0.000 claims abstract description 10
- 238000010998 test method Methods 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 81
- 238000004140 cleaning Methods 0.000 claims description 60
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 44
- 239000000243 solution Substances 0.000 claims description 34
- 239000011780 sodium chloride Substances 0.000 claims description 22
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 19
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 19
- 238000002156 mixing Methods 0.000 claims description 18
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims description 17
- 239000012085 test solution Substances 0.000 claims description 16
- 238000011010 flushing procedure Methods 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 7
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 6
- 229940079826 hydrogen sulfite Drugs 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 239000003513 alkali Substances 0.000 claims description 3
- 239000000284 extract Substances 0.000 claims description 3
- 230000033116 oxidation-reduction process Effects 0.000 claims description 3
- 238000011056 performance test Methods 0.000 claims description 3
- 238000005374 membrane filtration Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 238000002360 preparation method Methods 0.000 description 9
- 238000005457 optimization Methods 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000009395 breeding Methods 0.000 description 2
- 230000001488 breeding effect Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of membrane testing, and particularly relates to a membrane testing method which solves the problem of low testing efficiency of membrane filtration performance. A method of testing a film comprising the steps of: s1, roughly adjusting concentration; s2, temperature control; s3, finely adjusting the concentration; s4, PH control; s5, controlling output pressure; s6, filtering and testing; s7, residual water is measured; s8, calculating and analyzing the recovery rate. The method has the advantages of high efficiency and accurate and reliable test result.
Description
Technical Field
The invention belongs to the technical field of film testing, and particularly relates to a film testing method.
Background
After the production of the membrane column for filtration is finished, the filtration performance is required to be detected before delivery, so that the qualification rate of delivered products is ensured, and unnecessary loss and influence caused by the fact that the filtration performance does not reach the standard when the membrane column is used are avoided.
In the existing test methods, most of experimental small-scale tests are low in test efficiency, and cannot efficiently complete large-batch test requirements, so that the test method which is efficient, easy to implement and considerable in cost is very necessary to solve the test requirements.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a high-efficiency film testing method.
The aim of the invention can be achieved by the following technical scheme: a method of testing a film comprising the steps of:
s1, roughly adjusting concentration, and preparing a test solution with approximate concentration;
s2, temperature control is carried out, and the test liquid obtained in the step S1 is heated to a preset temperature and then is output;
s3, finely adjusting the concentration, and mixing and adding high-concentration test liquid or solute into the test liquid output by the S2 through a pipeline mixer to adjust the concentration to a preset concentration;
s4, PH control, namely mixing and adding alkali liquor into the pipeline mixer in the step S3 to adjust the pH to a preset pH value;
s5, outputting pressure control, namely outputting the test liquid adjusted in the S4 at a preset flow rate and pressure;
s6, filtering test, namely inputting the test liquid output by the S5 into a membrane column for filtering performance test, wherein the input quantity is A;
s7, residual water is measured, and the residual water amount after the filtration in the step S6 is measured and recorded as B;
s8, recovery analysis, wherein the recovery of the membrane is recorded as C, and C=B/A.100%.
According to the membrane testing method, the test liquid with preset requirements is prepared, the test liquid is introduced into the membrane column to be tested for filtering so as to achieve the purpose of performance testing, partial substances in the test liquid are filtered out due to the filtering effect of the membrane column, so that the reflux test liquid is reduced, the recovery rate of the membrane can be obtained by analyzing the front and rear amounts of the test liquid, and the PH, the concentration and the temperature are controlled to preset values in the preparation process of the test liquid, so that the accuracy of a testing result is ensured.
In the above membrane testing method, the test solution prepared in step S1 is a sodium chloride solution, and step S1 specifically includes:
preparing a high-concentration sodium chloride solution in a salt dissolving tank;
and mixing water and the high-concentration sodium chloride solution through a water injector, and then inputting the mixture into a water tank to obtain the sodium chloride test solution with approximate concentration.
The sodium chloride solution is prepared by the sequence of coarse adjustment and then fine adjustment, and the preparation accuracy is higher.
In the above film testing method, the step S2 specifically includes: the test liquid flows out from the water tank, sequentially passes through the thermometer transmitting assembly and the heater assembly and flows back to the water tank, and continuously flows and circulates until the temperature of the test liquid is stabilized at a preset temperature.
The test fluid passes through the heater assembly and circulates back to help quickly heat the entire fluid to a preset temperature.
In the above film testing method, the temperature is controlled to 20-30 ℃ in the step S2.
In the above film testing method, the step S3 specifically includes: and (2) gradually adding the high-concentration sodium chloride solution in the salt dissolving tank into the test solution output in the step (S2) through a pipeline mixer until the salinity transmitter assembly detects that the concentration of sodium chloride reaches the preset concentration.
And mixing the high-concentration sodium chloride solution with water through a pipeline mixer to obtain the required test solution, wherein the concentration of the test solution can be controlled to a preset value by controlling the mixing proportion through the concentration signal measured by the salinity transmitter assembly.
In the above-mentioned membrane test method, in the step S4, the adjustment of PH is specifically achieved by adding sodium hydroxide.
In the above film testing method, after the step S7, the method further includes: s7-1, cleaning the membrane.
And a cleaning step is arranged after the film test and is used for cleaning the tested film so as to remove filter residues and test liquid remained in the film.
In the above film testing method, the step S7.1 includes:
A1. preparing a cleaning solution;
A2. c, the cleaning solution prepared in the step A1 is positively introduced into the membrane column, and then the output passage is closed to infiltrate the membrane column;
A3. closing a cleaning liquid input passage at the front end of a part of membrane column and opening a cleaning liquid output passage at the front end to perform back flushing of the part of membrane column;
A4. resetting the cleaning liquid input passage and the cleaning liquid output passage in the step A3, closing the cleaning liquid input passage at the front end of the residual membrane column, and opening the cleaning liquid output passage at the front end of the residual membrane column to perform back flushing of the residual membrane column.
After the preparation of the cleaning liquid is finished, the cleaning liquid is firstly introduced into the membrane column from the front end to carry out infiltration reaction, the subsequent flushing effect is improved, after a period of time, the cleaning liquid is formed by opening the output channel of part of the membrane column, enters from the front end of the part of the membrane column, enters from the rear end of the other part of the membrane column after passing through the part of the membrane column, flows out from the front end of the part of the membrane column, the flushing effect of the part of the membrane column is realized, and the efficient cleaning of filter residues and test liquid in the part of the membrane column is facilitated. Wherein the front end is connected to one end of the input test liquid during the test.
In the above film test method, the cleaning liquid includes sodium bisulphite solution.
After the cleaning is finished, part of sodium bisulphite solution is reserved in the membrane column, the freezing point can be reduced, the problem that the membrane column is damaged due to freezing caused by low temperature encountered by the membrane column in transportation is solved, and in addition, the sodium bisulphite has reducibility, can be used for consuming oxygen, has a bactericidal effect, and can prevent the breeding of microorganisms such as internal bacteria.
In the above film testing method, the mixing process of the cleaning solution in the step A1 specifically includes: sodium bisulphite metering pump extracts sodium bisulphite solution from sodium bisulphite metering box, mix into the conduit through the pipeline mixer, and detect the concentration of hydrogen sulfite through the oxidation-reduction potential transducer of the rear end, adjust the output mixing amount of the sodium bisulphite metering pump in order to adjust the content of hydrogen sulfite in the cleaning fluid to the range of predetermineeing.
Compared with the prior art, the invention has the following advantages:
1. according to the membrane testing method, the test liquid with preset requirements is prepared, the test liquid is introduced into the membrane column to be tested for filtering so as to achieve the purpose of performance testing, partial substances in the test liquid are filtered out due to the filtering effect of the membrane column, so that the reflux test liquid is reduced, the recovery rate of the membrane can be obtained by analyzing the front and rear amounts of the test liquid, and the PH, the concentration and the temperature are controlled to preset values in the preparation process of the test liquid, so that the accuracy of a testing result is ensured.
2. And a cleaning operation is arranged after the film test and is used for cleaning the tested film so as to remove filter residues and test liquid remained in the film. After the preparation of the cleaning liquid is finished, the cleaning liquid is firstly introduced into the membrane column from the front end to carry out infiltration reaction, the subsequent flushing effect is improved, after a period of time, the cleaning liquid is formed by opening the output channel of part of the membrane column, enters from the front end of the part of the membrane column, enters from the rear end of the other part of the membrane column after passing through the part of the membrane column, flows out from the front end of the part of the membrane column, the flushing effect of the part of the membrane column is realized, and the efficient cleaning of filter residues and test liquid in the part of the membrane column is facilitated. Wherein the front end is connected to one end of the input test liquid during the test.
Drawings
Fig. 1 is a schematic flow chart of a film testing method provided by the invention.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The specific embodiment is shown in fig. 1, and the film testing method comprises the following steps:
s1, roughly adjusting concentration, and preparing a test solution with approximate concentration;
s2, temperature control is carried out, and the test liquid obtained in the step S1 is heated to a preset temperature and then is output;
s3, finely adjusting the concentration, and mixing and adding high-concentration test liquid or solute into the test liquid output by the S2 through a pipeline mixer to adjust the concentration to a preset concentration;
s4, PH control, namely mixing and adding alkali liquor into the pipeline mixer in the step S3 to adjust the pH to a preset pH value;
s5, outputting pressure control, namely outputting the test liquid adjusted in the S4 at a preset flow rate and pressure;
s6, filtering test, namely inputting the test liquid output by the S5 into a membrane column for filtering performance test, wherein the input quantity is A;
s7, residual water is measured, and the residual water amount after the filtration in the step S6 is measured and recorded as B;
s8, calculating the recovery rate, wherein the recovery rate of the membrane is recorded as C, and C=B/A.100%.
Specifically, according to the membrane testing method, the test liquid with preset requirements is prepared, the test liquid is introduced into the membrane column to be tested for filtering so as to achieve the purpose of performance testing, partial substances in the test liquid are filtered out due to the filtering effect of the membrane column, so that the reflux test liquid is reduced, the recovery rate of the membrane can be obtained by analyzing the front and rear amounts of the test liquid, and the PH, the concentration and the temperature are controlled to preset values in the preparation process of the test liquid, so that the accuracy of a testing result is ensured.
As an optimization, the test solution prepared in the step S1 is a sodium chloride solution, and the step S1 specifically includes: preparing a high-concentration sodium chloride solution in a salt dissolving tank; and mixing water and the high-concentration sodium chloride solution through a water injector, and then inputting the mixture into a water tank to obtain the sodium chloride test solution with approximate concentration. The sodium chloride solution is prepared by the sequence of coarse adjustment and then fine adjustment, and the preparation accuracy is higher.
As optimization, step S2 specifically includes: the test liquid flows out from the water tank, sequentially passes through the thermometer transmitting assembly and the heater assembly and flows back to the water tank, and continuously flows and circulates until the temperature of the test liquid is stabilized at a preset temperature. The test fluid passes through the heater assembly and circulates back to help quickly heat the entire fluid to a preset temperature.
As an optimization of this embodiment, step S2 controls the temperature to 25 degrees celsius.
As optimization, step S3 specifically includes: and (2) gradually adding the high-concentration sodium chloride solution in the salt dissolving tank into the test solution output in the step (S2) through a pipeline mixer until the salinity transmitter assembly detects that the concentration of sodium chloride reaches the preset concentration.
In other words, the high concentration sodium chloride solution is mixed with water by the pipeline mixer to obtain the required test solution, wherein the concentration of the test solution can be controlled to a preset value by controlling the mixing proportion through the concentration signal measured by the salinity transmitter assembly.
Preferably, in step S4, the PH is adjusted by adding sodium hydroxide.
As optimization, step S7 further includes: s7-1, cleaning the membrane. Step S7.1 includes:
A1. preparing a cleaning solution containing sodium bisulfite solution;
A2. c, the cleaning solution prepared in the step A1 is positively introduced into the membrane column, and then the output passage is closed to infiltrate the membrane column;
A3. closing a cleaning liquid input passage at the front end of a part of membrane column and opening a cleaning liquid output passage at the front end to perform back flushing of the part of membrane column;
A4. resetting the cleaning liquid input passage and the cleaning liquid output passage in the step A3, closing the cleaning liquid input passage at the front end of the residual membrane column, and opening the cleaning liquid output passage at the front end of the residual membrane column to perform back flushing of the residual membrane column.
Specifically, a membrane cleaning operation is provided after the membrane test to clean the tested membrane to remove the filter residue and the test liquid remaining therein. After the preparation of the cleaning liquid is finished, the cleaning liquid is firstly introduced into the membrane column from the front end to carry out infiltration reaction, the subsequent flushing effect is improved, after a period of time, the cleaning liquid is formed by opening the output channel of part of the membrane column, enters from the front end of the part of the membrane column, enters from the rear end of the other part of the membrane column after passing through the part of the membrane column, flows out from the front end of the part of the membrane column, the flushing effect of the part of the membrane column is realized, and the efficient cleaning of filter residues and test liquid in the part of the membrane column is facilitated. Wherein the front end is connected to one end of the input test liquid during the test. After the cleaning is finished, part of sodium bisulphite solution is reserved in the membrane column, the freezing point can be reduced, the problem that the membrane column is damaged due to freezing caused by low temperature encountered by the membrane column in transportation is solved, and in addition, the sodium bisulphite has reducibility, can be used for consuming oxygen, has a bactericidal effect, and can prevent the breeding of microorganisms such as internal bacteria.
As an optimization, the mixing process of the cleaning liquid in the step A1 specifically includes: sodium bisulphite metering pump extracts sodium bisulphite solution from sodium bisulphite metering box, mix into the conduit through the pipeline mixer, and detect the concentration of hydrogen sulfite through the oxidation-reduction potential transducer of the rear end, adjust the output mixing amount of the sodium bisulphite metering pump in order to adjust the content of hydrogen sulfite in the cleaning fluid to the range of predetermineeing.
As a specific optimization of this embodiment, the piping connection for membrane cleaning is specifically: the front ends of the membrane columns are respectively connected to the output ends of the cleaning liquid preparation assembly, independent switch valves are arranged between the membrane columns, cleaning liquid outflow pipelines capable of being independently opened and closed are also respectively arranged at the front ends of the membrane columns, the rear ends of the membrane columns are mutually connected, the valves are all opened when the membrane columns are immersed, after the membrane columns are filled with cleaning liquid, the cleaning liquid output pipelines are closed, the membrane columns are kept stand to enable the membrane columns to be fully immersed for reaction, and then corresponding backwashing can be realized through the valve switch operation according to the cleaning method.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. A method of testing a membrane, comprising the steps of:
s1, roughly adjusting concentration, and preparing a test solution with approximate concentration;
s2, temperature control is carried out, and the test liquid obtained in the step S1 is heated to a preset temperature and then is output;
s3, finely adjusting the concentration, and mixing and adding high-concentration test liquid or solute into the test liquid output by the S2 through a pipeline mixer to adjust the concentration to a preset concentration;
s4, PH control, namely mixing and adding alkali liquor into the pipeline mixer in the step S3 to adjust the pH to a preset pH value;
s5, outputting pressure control, namely outputting the test liquid adjusted in the S4 at a preset flow rate and pressure;
s6, filtering test, namely inputting the test liquid output by the S5 into a membrane column for filtering performance test, wherein the input quantity is A;
s7, residual water is measured, and the residual water amount after the filtration in the step S6 is measured and recorded as B;
s8, calculating the recovery rate, wherein the recovery rate of the membrane is recorded as C, and C=B/A.100%.
2. The method according to claim 1, wherein the test solution prepared in step S1 is a sodium chloride solution, and step S1 specifically includes:
preparing a high-concentration sodium chloride solution in a salt dissolving tank;
and mixing water and the high-concentration sodium chloride solution through a water injector, and then inputting the mixture into a water tank to obtain the sodium chloride test solution with approximate concentration.
3. The method according to claim 2, wherein the step S2 is specifically: the test liquid flows out from the water tank, sequentially passes through the thermometer transmitting assembly and the heater assembly and flows back to the water tank, and continuously flows and circulates until the temperature of the test liquid is stabilized at a preset temperature.
4. A method according to claim 3, wherein the step S2 is performed at a temperature of 20-30 ℃.
5. A method according to claim 3, wherein the step S3 specifically comprises: and (2) gradually adding the high-concentration sodium chloride solution in the salt dissolving tank into the test solution output in the step (S2) through a pipeline mixer until the salinity transmitter assembly detects that the concentration of sodium chloride reaches the preset concentration.
6. The method according to claim 1, wherein the PH is adjusted in step S4 by adding sodium hydroxide.
7. The method according to any one of claims 1 to 6, wherein after step S7, further comprising: s7-1, cleaning the membrane.
8. The method according to claim 7, wherein the step S7.1 comprises:
A1. preparing a cleaning solution;
A2. c, the cleaning solution prepared in the step A1 is positively introduced into the membrane column, and then the output passage is closed to infiltrate the membrane column;
A3. closing a cleaning liquid input passage at the front end of a part of membrane column and opening a cleaning liquid output passage at the front end to perform back flushing of the part of membrane column;
A4. resetting the cleaning liquid input passage and the cleaning liquid output passage in the step A3, closing the cleaning liquid input passage at the front end of the residual membrane column, and opening the cleaning liquid output passage at the front end of the residual membrane column to perform back flushing of the residual membrane column.
9. The method of claim 8, wherein the cleaning solution comprises a sodium bisulfite solution.
10. The method according to claim 9, wherein the mixing process of the cleaning solution in the step A1 specifically includes: sodium bisulphite metering pump extracts sodium bisulphite solution from sodium bisulphite metering box, mix into the conduit through the pipeline mixer, and detect the concentration of hydrogen sulfite through the oxidation-reduction potential transducer of the rear end, adjust the output mixing amount of the sodium bisulphite metering pump in order to adjust the content of hydrogen sulfite in the cleaning fluid to the range of predetermineeing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311801454.4A CN117771956A (en) | 2023-12-25 | 2023-12-25 | Film testing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311801454.4A CN117771956A (en) | 2023-12-25 | 2023-12-25 | Film testing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117771956A true CN117771956A (en) | 2024-03-29 |
Family
ID=90399484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311801454.4A Pending CN117771956A (en) | 2023-12-25 | 2023-12-25 | Film testing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117771956A (en) |
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2023
- 2023-12-25 CN CN202311801454.4A patent/CN117771956A/en active Pending
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