CN112774455A - Dry state leakage detection method for column type hollow fiber ultrafiltration membrane component - Google Patents
Dry state leakage detection method for column type hollow fiber ultrafiltration membrane component Download PDFInfo
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- CN112774455A CN112774455A CN202011503779.0A CN202011503779A CN112774455A CN 112774455 A CN112774455 A CN 112774455A CN 202011503779 A CN202011503779 A CN 202011503779A CN 112774455 A CN112774455 A CN 112774455A
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- CN
- China
- Prior art keywords
- column type
- hollow fiber
- type hollow
- fiber ultrafiltration
- ultrafiltration membrane
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
Abstract
The invention provides a dry state leak detection method for a column type hollow fiber ultrafiltration membrane component, which comprises the steps of coating detection liquid on an outlet at the end part of the column type hollow fiber ultrafiltration membrane component to be detected after confirming the outer side sealing effect of the column type hollow fiber ultrafiltration membrane component, blowing compressed air from the outer side after coating is finished, observing whether the detection liquid at the opening of a membrane wire at the end part is closed or not, and knowing whether the membrane wire is intact or not.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membrane production processes, in particular to a dry state leakage detection method for a column type hollow fiber ultrafiltration membrane component.
Background
The ultrafiltration technology is widely applied to the fields of various water treatments and material separation, and a column type hollow fiber ultrafiltration membrane is a common ultrafiltration membrane.
The production process of column type hollow fiber ultrafiltration membrane generally comprises the steps of filling dried membrane silk bundles into a membrane shell, pre-plugging holes, filling and sealing with epoxy glue, and then cutting off redundant glue to expose membrane holes to obtain a semi-finished product of the membrane component. Due to the defects of the membrane filaments and inevitable physical damage in the process of filament loading operation, the semi-finished column type hollow fiber ultrafiltration membrane component generally has certain membrane filament damage, and the leakage detection and leakage stoppage are needed before the factory leaves the factory aiming at the part of damaged membrane filaments.
The traditional detection method of the column type hollow fiber ultrafiltration membrane component is immersion detection: and immersing the membrane component in a water tank, introducing compressed air from the external pressure side of the membrane component, observing whether continuous bubbles emerge from the liquid level of the water tank, and if the continuous bubbles emerge, indicating that a leakage point exists in the corresponding membrane wire and needing to be subjected to leakage repairing. The traditional immersion type detection method has various defects, such as complex operation, observation in a water tank, repeated marking, large amount of water absorption after immersion for a membrane assembly with a large size, difficulty in moving and carrying, excessive COD (chemical oxygen demand) index in waste water generated after detection, incapability of directly discharging, increased water treatment pressure, water control treatment for the membrane assembly after detection, increased post-treatment procedures, and easy membrane assembly microbial pollution caused in the water treatment process.
Disclosure of Invention
In view of the above, the invention provides a dry state detection method for a column type hollow fiber ultrafiltration membrane component.
The technical scheme of the invention is realized as follows: the invention provides a dry state leak detection method for a column type hollow fiber ultrafiltration membrane component, which comprises the following steps:
step one, placing a column type hollow fiber ultrafiltration membrane component to be detected on a clean working platform horizontally, introducing compressed air from the outer side of the working platform, and entering a step two under the condition that the pressure value of the compressed air is stable and the outer side is sealed normally;
secondly, coating detection liquid on the end face of the membrane component to be detected under the condition of keeping the compressed air introduced from the outer side, so that the end part of each membrane wire of the column type hollow fiber ultrafiltration membrane component is covered by the detection liquid;
and thirdly, observing whether the end part of the membrane component coated with the detection liquid has a cavity or a bubble, wherein the membrane filament corresponding to the end part with the cavity or the bubble is the membrane filament needing to be blocked, and marking the membrane filament with the cavity and the bubble.
Based on the above technical solution, preferably, the viscosity of the detection liquid is 1000-5000 cP.
On the basis of the technical scheme, preferably, the detection solution comprises the following components in parts by weight:
on the basis of the technical scheme, the disinfectant also comprises a bactericide, wherein the bactericide is used in an amount of 0.05-0.5% of the amount of all other components.
More preferably, the bactericide is one or a mixture of more of sodium hypochlorite, chlorine dioxide and parachlorometaxylenol.
On the basis of the technical scheme, preferably, the surfactant is one or a mixture of more of fatty alcohol-polyoxyethylene ether sodium sulfate, fatty acid methyl ester sodium sulfonate or lauryl sodium sulfate.
On the basis of the above technical solution, preferably, the pressure of the compressed air is 0.05-0.3 MPa.
Compared with the prior art, the dry state leak detection method of the column type hollow fiber ultrafiltration membrane component has the following beneficial effects:
(1) the leakage detection method of the invention abandons the conventional immersion leakage detection, can save a large amount of water, can avoid polluting water, and simultaneously adopts the immersion leakage detection to confirm and mark the pipe needing to be blocked;
(2) the leak detection method does not need water, so that the membrane component does not need to be dried in the later period, the problem that membrane wires mildew is avoided, the whole method is simple in flow, only corresponding detection liquid needs to be prepared, the using amount of the detection liquid is small, the detection liquid can be coated on the end portion, the judgment mode is simple, the positions of the membrane wires needing to be blocked can be directly confirmed, the difficulty of confirming the leakage blocking is greatly reduced, and the leak detection method has a good application prospect.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
Respectively weighing 20 parts of glycerol and 0.5 part of fatty alcohol-polyoxyethylene ether sodium sulfate, and mixing and stirring uniformly to obtain a detection solution, wherein the viscosity of the detection solution is cP.
Will wait to detect eight cun column type membranes of PVC material that keep flat on clean work platform, let in 0.05 MPa's compressed air from the column type membrane outside, 30 seconds under keeping letting in compressed air's the state, whether the pressure that detects the column type membrane outside simultaneously is 0.05MPa, if the pressure stability is unchangeable, the gas tightness in the membrane outside is good, will detect liquid uniform coating in column type membrane module open-ended one end, guarantee that the opening of every membrane silk all is coated with detection liquid, the coating finishes, wait for 10 seconds, can see that there is the detection liquid of the opening part encapsulated situation of 1 membrane silk to be blown open, there is the outstanding bubble of detection liquid formation of 2 membrane silk openings part in addition. And plugging treatment can be carried out after marking.
Example 2
Respectively weighing 20 parts of sterile ultrafiltration produced water, 40 parts of glycerol, 1 part of fatty acid methyl ester sodium sulfonate and 5 parts of sodium chloride, and uniformly mixing and stirring to obtain a detection solution, wherein the viscosity of the detection solution is cP.
The polysulfone five-inch column type membrane to be detected is flatly placed on a cleaning working platform, 0.1MPa compressed air is introduced from the outer side of the column type membrane, the compressed air is kept introduced for 30 seconds in the state, whether the pressure outside the column type membrane is 0.1MPa or not is detected, if the pressure is stable and unchanged, the air tightness of the outer side of the membrane is good, the detection liquid is uniformly coated at one end of an opening of the column type membrane assembly, the opening of each membrane wire is guaranteed to be coated with the detection liquid, the coating is finished, 10 seconds are waited, and the detection liquid in the sealing state of the opening of 1 membrane wire can be seen to be blown away. And plugging treatment can be carried out after marking.
Example 3
Respectively weighing 30 parts of sterile ultrafiltration produced water, 50 parts of glycerol, 2 parts of sodium dodecyl sulfate, 10 parts of sodium chloride and 0.046 part of sodium hypochlorite, and uniformly mixing and stirring to obtain a detection solution, wherein the viscosity of the detection solution is cP.
The polyether sulfone material five cun column type membrane that will wait to detect is kept flat on clean work platform, let in 0.2 MPa's compressed air from the column type membrane outside, keep letting in 30 seconds under the state of compressed air, whether the pressure that detects the column type membrane outside simultaneously is 0.2MPa, if the pressure stability is unchangeable, the gas tightness in the membrane outside is good, will detect liquid uniform coating in column type membrane module open-ended one end, guarantee that the opening of every membrane silk all is coated with detection liquid, the coating finishes, wait for 10 seconds, can see that the detection liquid that has the opening part encapsulated situation of 2 membrane silks is blown open. And plugging treatment can be carried out after marking.
Example 4
Respectively weighing 40 parts of sterile ultrafiltration produced water, 60 parts of glycerol, 2 parts of lauryl sodium sulfate, 1 part of fatty alcohol-polyoxyethylene ether sodium sulfate, 20 parts of sodium chloride and 0.25 part of chlorine dioxide, and uniformly mixing and stirring to obtain a detection solution, wherein the viscosity of the detection solution is cP.
The eight cun column type membranes of polyacrylonitrile material that will wait to detect are kept flat on clean work platform, let in 0.25 MPa's compressed air from the column type membrane outside, 30 seconds under keeping letting in compressed air's the state, whether the pressure that detects the column type membrane outside simultaneously is 0.25MPa, if the pressure stability is unchangeable, the gas tightness in the membrane outside is good, will detect liquid even coating in column type membrane module open-ended one end, guarantee that the opening of every membrane silk all is coated with and detect liquid, the coating finishes, wait for 10 seconds, can see that there is the detection liquid of the opening part encapsulated situation of 2 membrane silks to be blown open, there is the outstanding bubble of detection liquid formation of 2 membrane silk openings part in addition. And plugging treatment can be carried out after marking.
Example 5
Respectively weighing 50 parts of sterile ultrafiltration produced water, 80 parts of glycerol, 3 parts of fatty acid methyl ester sodium sulfonate, 2 parts of fatty alcohol-polyoxyethylene ether sodium sulfate, 30 parts of sodium chloride, 0.4 part of chlorine dioxide and 0.425 part of parachlorometaxylenol, and uniformly mixing and stirring to obtain a detection solution, wherein the viscosity of the detection solution is cP.
Will wait to detect five cun column type membranes of polyvinylidene fluoride material that wait to keep flat on clean work platform, let in 0.3 MPa's compressed air from the column type membrane outside, keep letting in 30 seconds under the state of compressed air, whether the pressure that detects the column type membrane outside simultaneously is 0.3MPa, if the pressure stability is unchangeable, then prove that the gas tightness in the membrane outside is good, will detect liquid uniform coating in column type membrane module open-ended one end, guarantee that the opening of every membrane silk all is coated with detection liquid, the coating finishes, wait for 10 seconds, can see that there is the detection liquid of the opening part encapsulated situation of 1 membrane silk to be blown open, there is the detection liquid of 1 membrane silk opening part to form outstanding bubble in addition. And plugging treatment can be carried out after marking.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A dry state leak detection method for a column type hollow fiber ultrafiltration membrane component is characterized by comprising the following steps:
step one, placing a column type hollow fiber ultrafiltration membrane component to be detected on a clean working platform horizontally, introducing compressed air from the outer side of the working platform, and entering a step two under the condition that the pressure value of the compressed air is stable and the outer side is sealed normally;
secondly, coating detection liquid on the end face of the membrane component to be detected under the condition of keeping the compressed air introduced from the outer side, so that the end part of each membrane wire of the column type hollow fiber ultrafiltration membrane component is covered by the detection liquid;
and thirdly, observing whether the end part of the membrane component coated with the detection liquid has a cavity or a bubble, wherein the membrane filament corresponding to the end part with the cavity or the bubble is the membrane filament needing to be blocked, and marking the membrane filament with the cavity and the bubble.
2. The dry state leak detection method for the column type hollow fiber ultrafiltration membrane module as claimed in claim 1, wherein the viscosity of the detection liquid is 1000-5000 cP.
3. The dry state leak detection method for the column type hollow fiber ultrafiltration membrane module according to claim 1, wherein the detection solution comprises the following components in parts by weight:
4. the dry state leak detection method for the column type hollow fiber ultrafiltration membrane module according to claim 3, further comprising a bactericide, wherein the amount of the bactericide is 0.05 to 0.5 percent of the amount of all other components.
5. The dry state leak detection method for the column type hollow fiber ultrafiltration membrane module according to claim 4, wherein the bactericide is one or a mixture of more of sodium hypochlorite, chlorine dioxide and parachlorometaxylenol.
6. The dry state leak detection method for the column type hollow fiber ultrafiltration membrane module as claimed in claim 3, wherein the surfactant is one or a mixture of several of sodium fatty alcohol polyoxyethylene ether sulfate, sodium fatty acid methyl ester sulfonate or sodium dodecyl sulfate.
7. The dry state leak detection method for the column type hollow fiber ultrafiltration membrane module according to claim 1, wherein the pressure of the compressed air is 0.05 to 0.3 MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011503779.0A CN112774455A (en) | 2020-12-18 | 2020-12-18 | Dry state leakage detection method for column type hollow fiber ultrafiltration membrane component |
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| CN202011503779.0A CN112774455A (en) | 2020-12-18 | 2020-12-18 | Dry state leakage detection method for column type hollow fiber ultrafiltration membrane component |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114646431A (en) * | 2022-02-28 | 2022-06-21 | 武汉艾科滤膜技术有限公司 | Ultrafiltration membrane leak detection method based on acid-base indicator |
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| CN101056694A (en) * | 2004-11-10 | 2007-10-17 | 三菱丽阳工程株式会社 | Hydrophilizing agent for hydrophobic porous film and methods of hydrophilizing and inspecting hydrophobic porous film with the same |
| CN104334261A (en) * | 2012-03-26 | 2015-02-04 | 三菱丽阳株式会社 | Porous film preservation solution |
| CN107727323A (en) * | 2017-11-07 | 2018-02-23 | 中石油昆仑燃气有限公司 | A kind of gas leakage detects liquid |
| CN108489682A (en) * | 2018-05-22 | 2018-09-04 | 大连科琳清洗化学有限公司 | Leak detection liquid and its preparation method and application |
| CN109758910A (en) * | 2018-12-27 | 2019-05-17 | 天津膜天膜科技股份有限公司 | Inspection method for repairing and mending for hollow fiber film assembly |
-
2020
- 2020-12-18 CN CN202011503779.0A patent/CN112774455A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101056694A (en) * | 2004-11-10 | 2007-10-17 | 三菱丽阳工程株式会社 | Hydrophilizing agent for hydrophobic porous film and methods of hydrophilizing and inspecting hydrophobic porous film with the same |
| CN104334261A (en) * | 2012-03-26 | 2015-02-04 | 三菱丽阳株式会社 | Porous film preservation solution |
| CN107727323A (en) * | 2017-11-07 | 2018-02-23 | 中石油昆仑燃气有限公司 | A kind of gas leakage detects liquid |
| CN108489682A (en) * | 2018-05-22 | 2018-09-04 | 大连科琳清洗化学有限公司 | Leak detection liquid and its preparation method and application |
| CN109758910A (en) * | 2018-12-27 | 2019-05-17 | 天津膜天膜科技股份有限公司 | Inspection method for repairing and mending for hollow fiber film assembly |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114646431A (en) * | 2022-02-28 | 2022-06-21 | 武汉艾科滤膜技术有限公司 | Ultrafiltration membrane leak detection method based on acid-base indicator |
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Application publication date: 20210511 |