CN103551045A - Dye determination method for oxidization condition of reverse osmosis membrane - Google Patents
Dye determination method for oxidization condition of reverse osmosis membrane Download PDFInfo
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- CN103551045A CN103551045A CN201310556628.5A CN201310556628A CN103551045A CN 103551045 A CN103551045 A CN 103551045A CN 201310556628 A CN201310556628 A CN 201310556628A CN 103551045 A CN103551045 A CN 103551045A
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- reverse osmosis
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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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- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention provides a dye determination method for an oxidization condition of a reverse osmosis membrane. The method is used for determining the oxidization condition of the reverse osmosis membrane through a dye. The method comprises the following steps of mixing the dye and a solvent to obtain a dye solution, and dropping a proper amount of the dye solution to the surface of the reverse osmosis membrane to be detected; if a colored region emerges in the surface of the reverse osmosis membrane, indicating that a desalting layer of the reverse osmosis membrane is damaged; if the dye cannot be adsorbed onto the surface of the reverse osmosis membrane, indicating that the desalting layer of the reverse osmosis membrane is intact. According to the method, the damage to the reverse osmosis membrane can be quickly and accurately determined, and preliminary estimation and judgment can be conveniently performed on the oxidization condition of the reverse osmosis membrane; the dye determination method has the advantages of low cost, simplicity in operation, accurate result and the like.
Description
Technical field
The dyestuff decision method that the present invention relates to a kind of oxidation situation of reverse osmosis membrane, belongs to water-treatment technology field.
Background technology
Thermal power plant is the water rich and influential family of industrial enterprise, and all will consume a large amount of water resources every day, produces a large amount of industrial wastewaters simultaneously, therefore, adopts reasonable, advanced water technology, realizes waste water and recycles, significant to environmental protection.Reverse osmosis membrane separation technology because having without phase transformation, there is not chemical change, modularization, the many merits such as flow process is simple, easy to operate, floor space is little, reduced investment, power consumption are low, thermal power plant from 20th century the mid-80 Qi China obtains applying more and more widely, is mainly used at present the recycling of power plant boiler makeup Water System, circulating sewage (industrial wastewater) and Coastal Power Plant seawater desalination system etc.
Because the particularity of membrane material and the development of reverse osmosis technology are limit, because the reasons such as design, operation, misoperation easily cause reverse osmosis membrane system oxidative degradation and serious dirty stifled, this has become two large subject matters of film system.These problems can cause decline, the rising of membrane module inlet outlet pressure differential, the reduction of production efficiency of film processing system performance (salt rejection rate and aquifer yield), and can cause the series of problems such as irregular stoppage in transit, Frequent Accidents, membrane module are often changed, the increase of operation expense.
The reverse osmosis membrane processing project of a plurality of power plant of recent year is in operation and has occurred film oxidation and the dirty serious problems such as stifled.When Datang Wang Tan power plant seawater desalination system moves more than 3 years, there is serious oxidation and dirty stifled in seawater reverse osmosis membrane, milipore filter, and shorten the service life of film, frequently changes membrane module and increased the weight of economy of power plant burden.Extremely urgent for guaranteeing the research of film oxidation that power plant safety, stable, economic operation ，Dui power plant reverse osmosis water treatment system produce and the dirty problem such as stifled.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of dyestuff decision method of oxidation situation of reverse osmosis membrane, it is the method that adopts dyestuff to judge the oxidation situation of reverse osmosis membrane, has simple to operate, result feature accurately.
For achieving the above object, the invention provides a kind of dyestuff decision method of oxidation situation of reverse osmosis membrane, it is the method that adopts dyestuff to judge the oxidation situation of reverse osmosis membrane, the method comprises the following steps:
Dyestuff and solvent are obtained to dye solution, appropriate dye solution is dropped in to the surface of reverse osmosis membrane to be detected;
If there is coloured region, illustrate that the desalination layer of reverse osmosis membrane is oxidized;
If dyestuff is not adsorbed in the surface of reverse osmosis membrane, illustrate that the desalination layer of reverse osmosis membrane is not oxidized.
In above-mentioned method, preferably, the solvent adopting is demineralized water and absolute ethyl alcohol.The use of solvent is mainly preparation dye solution, so that dyestuff can drop in reverse osmosis membrane surface and have appropriate mobility, for the consumption of demineralized water and absolute ethyl alcohol, can control as required, and the composition of solvent does not have substantial effect for judgement.
In above-mentioned method, preferably, the concentration of the dye solution adopting is 1wt%-10wt%; 3wt%-6wt% more preferably; 5wt% more preferably.
In above-mentioned method, preferably, the amount that drops in the dye solution on reverse osmosis membrane surface to be detected is that 1-3 drips.
In said method, coloured region there will be the reverse side at reverse osmosis membrane, there will be different colors while adopting different dyestuffs, there will be redness when adopting rhodamine B, adopts phenolphthalein to there will be redness, adopts methyl orange there will be orange red to orange-yellow; Adopt acid chromium blue k and eriochrome black T to there will be bluish violet, navy blue.
When judging, dye solution only need to drop in a part of region of reverse osmosis membrane.If reverse osmosis membrane is oxidized, dyestuff can penetrate film, and reverse side there will be corresponding color.If reverse osmosis membrane is not oxidized, dyestuff will be stayed the top layer of titration, can not permeate, and also just there will not be coloured region.
Adopt method of the present invention to reverse osmosis membrane, whether to exist damage to judge rapidly and accurately, be convenient to the oxidation situation of reverse osmosis membrane to carry out preliminary assessment and judgement, there is the advantages such as cost is low, simple to operate, result is accurate.
Accompanying drawing explanation
Fig. 1 a and Fig. 1 b are respectively in embodiment 1 photo in new reverse osmosis membrane and seriously polluted and oxidized reverse osmosis membrane front;
Fig. 2 a and Fig. 2 b are respectively in embodiment 1 photo of new reverse osmosis membrane and seriously polluted and oxidized reverse osmosis membrane reverse side.
The specific embodiment
For technical characterictic of the present invention, object and beneficial effect being had more clearly, understand, existing technical scheme of the present invention is carried out to following detailed description, but can not be interpreted as restriction that can practical range of the present invention.
Embodiment 1
The present embodiment provides a kind of dyestuff decision method of oxidation situation of reverse osmosis membrane, and it comprises the following steps:
A small amount of dye solution is dropped in to new reverse osmosis membrane and seriously polluted and oxidized reverse osmosis membrane (being the SW30HRLE-400i type reverse osmosis membrane that Dow Chemical company produces) surface, this dye solution is by rhodamine B and solvent composition, wherein, solvent is demineralized water and ethanol, and concentration is 5wt%;
If the desalination layer on film surface exists damage, the supporting layer of membrane material will come out, and a part of dyestuff is the supporting layer to membrane material by rapid osmotic, and this part being damaged will take on a red color;
If the desalination layer on film surface is intact, this dyestuff will not be adsorbed on film surface.
According to above-mentioned steps, new reverse osmosis membrane and seriously polluted and oxidized reverse osmosis membrane are oxidized to judgement, result is respectively shown in Fig. 1 a, Fig. 1 b, Fig. 2 a, Fig. 2 b, wherein, Fig. 1 a and Fig. 1 b are respectively in embodiment 1 photo in new reverse osmosis membrane and seriously polluted and oxidized reverse osmosis membrane front; Fig. 2 a and Fig. 2 b are respectively in embodiment 1 photo of new reverse osmosis membrane and seriously polluted and oxidized reverse osmosis membrane reverse side.
From Fig. 1 a, Fig. 1 b, can find out, dyestuff has penetrated seriously polluted and oxidized reverse osmosis membrane completely, and area coverage is larger, and circular dispersing out substantially, present redness, illustrate that this reverse osmosis membrane is really oxidized, surperficial desalination layer is by heavy damage;
From Fig. 2 a, Fig. 2 b, can find out, dyestuff completely sees through new reverse osmosis membrane, and it is oxidized that this has also illustrated that this reverse osmosis membrane surface desalination layer does not have, and is not destroyed, and this is that new diaphragm, the not oxidized fact are consistent with this reverse osmosis membrane.
From result of the test, can clearly find out and adopt the method for the present embodiment to utilize result that dyestuff detects the oxidation situation of reverse osmosis membrane and the actual conditions of diaphragm to fit like a glove, and test simple, workable.The method is applicable to the judgement whether diaphragm separating layer is oxidized.
Claims (7)
1. a dyestuff decision method for the oxidation situation of reverse osmosis membrane, it is the method that adopts dyestuff to judge the oxidation situation of reverse osmosis membrane, the method comprises the following steps:
Dyestuff and solvent are obtained to dye solution, appropriate dye solution is dropped in to the surface of reverse osmosis membrane to be detected;
If there is coloured region, illustrate that the desalination layer of reverse osmosis membrane is oxidized;
If dyestuff is not adsorbed in the surface of reverse osmosis membrane, illustrate that the desalination layer of reverse osmosis membrane is not oxidized.
2. method according to claim 1, wherein, described solvent is demineralized water and ethanol.
3. method according to claim 1 and 2, wherein, the concentration of described dye solution is 1wt% to 10wt%.
4. method according to claim 3, wherein, the concentration of described dye solution is 3wt% to 6wt%.
5. method according to claim 4, wherein, the concentration of described dye solution is 5wt%.
6. according to the method described in claim 1-5 any one, wherein, the amount that drops in the dye solution on reverse osmosis membrane surface to be detected is that 1-3 drips.
7. according to the method described in claim 1-6 any one, wherein, described dyestuff comprises one or more the combination in rhodamine B, phenolphthalein, methyl orange, acid chromium blue k and eriochrome black T.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399374A (en) * | 2014-11-25 | 2015-03-11 | 贵阳时代沃顿科技有限公司 | Method and device for detecting integrity of composite reverse osmosis membrane desalting layer |
| CN108489895A (en) * | 2018-03-20 | 2018-09-04 | 时代沃顿科技有限公司 | A kind of detection method and detecting instrument for the anti-wiping property value of reverse osmosis membrane |
| CN109884076A (en) * | 2019-04-03 | 2019-06-14 | 吉安加仑膜环保科技股份有限公司 | A method of analysis reverse osmosis membrane salt rejection rate performance |
| CN112337314A (en) * | 2020-10-23 | 2021-02-09 | 湖南沁森高科新材料有限公司 | Method for identifying oxidized polyamide membrane |
| JP7140303B1 (en) * | 2021-03-26 | 2022-09-21 | 東レ株式会社 | Reverse osmosis membrane damage inspection method |
| WO2022203078A1 (en) * | 2021-03-26 | 2022-09-29 | 東レ株式会社 | Method for inspecting damage in reverse osmosis membrane |
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| JPH06254358A (en) * | 1993-03-03 | 1994-09-13 | Toyobo Co Ltd | Detection of defect of reverse osmosis membrane |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104399374A (en) * | 2014-11-25 | 2015-03-11 | 贵阳时代沃顿科技有限公司 | Method and device for detecting integrity of composite reverse osmosis membrane desalting layer |
| CN104399374B (en) * | 2014-11-25 | 2016-08-17 | 贵阳时代沃顿科技有限公司 | A kind of method detecting complex reverse osmosis membrane desalination layer integrity and detection device thereof |
| CN108489895A (en) * | 2018-03-20 | 2018-09-04 | 时代沃顿科技有限公司 | A kind of detection method and detecting instrument for the anti-wiping property value of reverse osmosis membrane |
| CN109884076A (en) * | 2019-04-03 | 2019-06-14 | 吉安加仑膜环保科技股份有限公司 | A method of analysis reverse osmosis membrane salt rejection rate performance |
| CN112337314A (en) * | 2020-10-23 | 2021-02-09 | 湖南沁森高科新材料有限公司 | Method for identifying oxidized polyamide membrane |
| JP7140303B1 (en) * | 2021-03-26 | 2022-09-21 | 東レ株式会社 | Reverse osmosis membrane damage inspection method |
| WO2022203078A1 (en) * | 2021-03-26 | 2022-09-29 | 東レ株式会社 | Method for inspecting damage in reverse osmosis membrane |
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