CN111214961A - Method for cleaning membrane silk surfactant - Google Patents
Method for cleaning membrane silk surfactant Download PDFInfo
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- CN111214961A CN111214961A CN201811422455.7A CN201811422455A CN111214961A CN 111214961 A CN111214961 A CN 111214961A CN 201811422455 A CN201811422455 A CN 201811422455A CN 111214961 A CN111214961 A CN 111214961A
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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
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
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Abstract
A method for cleaning a membrane silk surfactant is characterized by comprising the following steps: a. preparing a cleaning solution according to the following components in percentage by weight: 10% -30% of salt, 1% -5% of alkali and 65% -89% of water; b. b, introducing the cleaning liquid obtained in the step a into a cleaning pool, and cleaning the surfactant in the filter element; c. and c, cleaning the filter element cleaned in the step b by using pure water, and finishing cleaning when the dissolved substance of the filter element reaches a set standard. The method is based on the principle that the surfactant generates the salting-out phenomenon in the salt solution, the surfactant in the membrane wires is cleaned, the water consumption is greatly reduced, and the water resource is saved; foam generated in the cleaning process is effectively reduced, and a subsequent foam treatment process is omitted, so that the field is cleaner, and the cleaning efficiency is higher; the cleaning liquid can be recycled and discharged in a centralized manner, so that green production and ecological environmental protection are realized.
Description
Technical Field
The invention relates to a method for cleaning a filter element of a water purifier, in particular to a method for cleaning a membrane silk surfactant.
Background
With the deep research and development of membrane separation technology, ultrafiltration membranes are widely applied to the water treatment industry. Generally, in order to maintain the size of membrane pores during the airing process of the membrane, a humectant such as a surfactant is added to solve the problem of membrane flux reduction and even loss caused by shrinkage deformation of the membrane pores during the airing process.
As the membrane silk of water purifier filter element material, its surfactant belongs to the organic matter. The national sanitary Specification for drinking water (GBT 5750-2001) has strict requirements on the release amount of organic substances. If the surface of the membrane wire is not cleaned sufficiently, organic matters are dissolved out to exceed the standard, and the water of the water purifier cannot reach the safety standard, so that the health of a user is threatened.
The Chinese patent with application number of 201510908749.0 discloses a formaldehyde purification porous adsorption film and a preparation method thereof. The porous adsorption film for purifying formaldehyde has the structural characteristic of porous amino acid grafted hydrocarbon polymer film. The preparation method comprises the following steps: the porous amino acid grafted hydrocarbon polymer membrane for formaldehyde purification is obtained by crosslinking a hydrocarbon polymer with amino acid under the action of an alkyl chain ultraviolet crosslinking agent, then forming a micelle structure in an inverted manner under the action of a nonionic surfactant, and washing to remove the surfactant after casting film formation. The formaldehyde porous adsorption film adopts a washing method to remove the surfactant, and a large amount of water is needed to wash the surfactant adsorbed by the film, so that the waste of water resources is caused, and the production time and the production cost are correspondingly increased; meanwhile, in the cleaning process, especially under the condition of high concentration, the surfactant can generate a large amount of foam to pollute the cleaning site, and the site needs to be cleaned subsequently, so that the cleaning efficiency is low.
Disclosure of Invention
The invention aims to provide a method for cleaning membrane silk surfactant with less water consumption and foam generation and high cleaning efficiency aiming at the technical current situation.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for cleaning a membrane silk surfactant is characterized by comprising the following steps:
a. preparing a cleaning solution according to the following components in percentage by weight:
10% -30% of salt;
1% -5% of alkali;
65% -89% of water;
b. b, introducing the cleaning liquid obtained in the step a into a cleaning pool, and cleaning the surfactant in the filter element;
c. and c, cleaning the filter element cleaned in the step b by using pure water, and finishing cleaning when the dissolved substance of the filter element reaches a set standard.
Further, the method for cleaning membrane wire surfactant according to claim 1, wherein the salt in step a is one or more of sodium chloride, potassium chloride, magnesium chloride, calcium chloride, sodium nitrate, potassium nitrate, magnesium nitrate, calcium nitrate, sodium sulfate, magnesium sulfate, potassium sulfate, sodium carbonate, potassium carbonate, magnesium carbonate, sodium bicarbonate, potassium bicarbonate and ammonium bicarbonate.
Further, the alkali in the step a is one or more of sodium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide.
Further, the filter element is a hollow fiber membrane or a flat membrane.
Furthermore, the material of the filter element is one or more of polyvinylidene fluoride, polyvinyl chloride, polyether sulfone, polysulfone and polyacrylonitrile.
Further, the surfactant in the step b is one or more of cationic surfactant, anionic surfactant and amphoteric surfactant.
Further, the time for cleaning the filter element by the cleaning solution in the step b is 1-3 hours.
In order to realize the cyclic utilization and centralized treatment and discharge of the cleaning liquid, the filter element in the step b is connected with a first filter through a first drain pipe, the first filter is connected with a second filter through a second drain pipe, the first drain pipe is provided with a sewage valve, and the second drain pipe is provided with a discharge valve; the first filter is further connected with the cleaning pool through a return pipe, and a circulating valve is arranged on the return pipe.
Further, when the used cleaning liquid contains less impurities, a sewage valve and a circulating valve are opened, a discharge valve is closed, the cleaning liquid which is cleaned by the filter element enters the first filter through the sewage valve for treatment, and then returns to the cleaning pool through the circulating valve for recycling;
when the used cleaning liquid contains more impurities, the circulation valve is closed, the sewage valve and the discharge valve are opened, the cleaning liquid which has cleaned the filter element enters the first filter through the sewage valve for treatment, then enters the second filter through the discharge valve for treatment, and then is discharged in a centralized manner.
Further, the first filter is one or more of a multi-medium filter, a screen and a filter membrane.
Further, when the impurities on the surface of the first filter are more, the impurities on the surface of the first filter are cleaned by adopting a forward washing or backwashing mode.
Further, the second filter treats the cleaning solution by one or more of heating, membrane method, electrochemical method and distillation.
Compared with the prior art, the invention has the advantages that: based on the principle that the surfactant generates a salting-out phenomenon in a salt solution, the surfactant in the membrane filaments is cleaned, so that the water consumption is greatly reduced, and the water resource is saved; foam generated in the cleaning process is effectively reduced, and a subsequent foam treatment process is omitted, so that the field is cleaner, and the cleaning efficiency is higher; the cleaning liquid can be recycled and discharged in a centralized manner, so that green production and ecological environmental protection are realized.
Drawings
FIG. 1 is a flow chart of a cleaning process in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
Example 1
The method comprises the steps of enabling cleaning liquid prepared by calcium chloride, sodium hydroxide and water at the temperature of 40 ℃ to enter a cleaning pool 2 through a water inlet 1 according to the mass ratio of 30:5:65, then placing a filter element 3 into the cleaning pool 2, introducing the cleaning liquid into the filter element 3 by using a booster pump (not shown in the figure), cleaning the filter element 3, and removing a large amount of surfactant in the filter element through the salting-out effect. The cleaning pressure of the cleaning solution is 0.1MPa, the temperature of the cleaning solution is 40 ℃, and the cleaning time is 1 hour. Subsequently, the pressurizing pump is turned off, the filter element 3 is taken out of the cleaning tank 2 and put into a rinsing tank (not shown in the figure), and a small amount of impurities and cleaning liquid remaining in the filter element 3 are rinsed with pure water. Wherein the rinse water is replaced every 5 hours to ensure that the concentration of impurities in the rinse water is maintained at a low level. Tests show that the filter element dissolved-out matter reaches the standard after being cleaned for 10 hours.
The filter element 3 is connected with a first filter 7 through a first drain pipe 4, the first filter 7 is connected with a second filter 8 through a second drain pipe 5, a sewage valve 40 is arranged on the first drain pipe 4, and a discharge valve 50 is arranged on the second drain pipe 5; the first filter 7 is also connected with the cleaning tank 2 through a return pipe 6, and a circulation valve 60 is arranged on the return pipe 6. When the cleaning liquid is circulated, the sewage valve 40 and the circulation valve 60 are opened, the discharge valve 50 is closed, the centrifugal pump (not shown) enables the cleaning liquid for cleaning the filter element 3 to enter the first filter 7 through the sewage valve 40 for filtration, and the filtered cleaning liquid is returned to the cleaning pool 2 through the circulation valve 60 for circulation. Wherein the first filter 7 is a screen filter with the filtering precision of 10-20 μm. The first filter 7 is backwashed once every 12 hours of use of the first filter 7 to remove impurities on the first filter 7, thereby improving the service life of the first filter 7.
When the cleaning liquid is intensively discharged and treated, after the cleaning liquid is recycled for 5 times, the sewage valve 40 and the discharge valve 50 are opened, the circulation valve 60 is closed, the cleaning liquid for cleaning the filter element 3 enters the first filter 7 through the sewage valve 40 for treatment, enters the second filter 8 through the discharge valve 50 for treatment, flows out of the water outlet 9, and is finally concentrated and discharged. Wherein the second filter 8 is a nanofiltration membrane.
The test method of the filter element dissolved substances in the embodiment refers to GB/T5750-2001 drinking water sanitation standard and GB/T5750.7-2006 drinking water standard test method organic matter comprehensive index.
Example 2:
magnesium sulfate, potassium hydroxide and water are mixed into cleaning liquid at the temperature of 40 ℃ according to the mass ratio of 15:2:83, the cleaning liquid enters a cleaning pool 2 through a water inlet 1, a filter element 3 is placed in the cleaning pool 2, the cleaning liquid is introduced into the filter element 3 by using a booster pump (not shown in the figure), the filter element 3 is cleaned, and a large amount of surfactant in the filter element is removed through the salting-out effect. The cleaning pressure of the cleaning solution is 0.1MPa, the temperature of the cleaning solution is 40 ℃, and the cleaning time is 2 hours. Subsequently, the pressurizing pump is turned off, the filter element 3 is taken out of the cleaning tank 2 and put into a rinsing tank (not shown in the figure), and a small amount of impurities and cleaning liquid remaining in the filter element 3 are rinsed with pure water. Wherein the rinse water is replaced every 5 hours to ensure that the concentration of impurities in the rinse water is maintained at a low level. After testing, the filter element dissolved-out matter reaches the standard after being cleaned for 15 hours.
The filter element 3 is connected with a first filter 7 through a first drain pipe 4, the first filter 7 is connected with a second filter 8 through a second drain pipe 5, a sewage valve 40 is arranged on the first drain pipe 4, and a discharge valve 50 is arranged on the second drain pipe 5; the first filter 7 is also connected with the cleaning tank 2 through a return pipe 6, and a circulation valve 60 is arranged on the return pipe 6. When the cleaning liquid is circulated, the sewage valve 40 and the circulation valve 60 are opened, the discharge valve 50 is closed, the centrifugal pump (not shown) enables the cleaning liquid for cleaning the filter element 3 to enter the first filter 7 through the sewage valve 40 for filtration, and the filtered cleaning liquid is returned to the cleaning pool 2 through the circulation valve 60 for circulation. Wherein the first filter 7 is a multimedia filter. The first filter 7 is backwashed once every 24 hours of use of the first filter 7 to remove impurities on the first filter 7, thereby improving the service life of the first filter 7.
When the cleaning liquid is intensively discharged and treated, after the cleaning liquid is recycled for 5 times, the sewage valve 40 and the discharge valve 50 are opened, the circulation valve 60 is closed, the cleaning liquid for cleaning the filter element 3 enters the first filter 7 through the sewage valve 40 for treatment, enters the second filter 8 through the discharge valve 50 for treatment, flows out of the water outlet 9, and is finally concentrated and discharged. Wherein the second filter 8 is a reverse osmosis membrane.
The test method of the filter element dissolved substances in the embodiment refers to GB/T5750-2001 drinking water sanitation standard and GB/T5750.7-2006 drinking water standard test method organic matter comprehensive index.
Example 3:
the method comprises the steps of enabling cleaning liquid prepared by ammonium bicarbonate, magnesium hydroxide and water at the temperature of 30 ℃ to enter a cleaning pool 2 through a water inlet 1 according to the mass ratio of 10:1:89, then placing a filter element 3 into the cleaning pool 2, introducing the cleaning liquid into the filter element 3 by using a booster pump (not shown in the figure), cleaning the filter element 3, and removing a large amount of surfactant in the filter element through the salting-out effect. The cleaning pressure of the cleaning solution is 0.1MPa, the temperature of the cleaning solution is 30 ℃, and the cleaning time is 3 hours. Subsequently, the pressurizing pump is turned off, the filter element 3 is taken out of the cleaning tank 2 and put into a rinsing tank (not shown in the figure), and a small amount of impurities and cleaning liquid remaining in the filter element 3 are rinsed with pure water. Wherein the rinse water is replaced every 5 hours to ensure that the concentration of impurities in the rinse water is maintained at a low level. After the filter element is cleaned for 25 hours, the filter element dissolved-out matter reaches the standard through testing.
The filter element 3 is connected with a first filter 7 through a first drain pipe 4, the first filter 7 is connected with a second filter 8 through a second drain pipe 5, a sewage valve 40 is arranged on the first drain pipe 4, and a discharge valve 50 is arranged on the second drain pipe 5; the first filter 7 is also connected with the cleaning tank 2 through a return pipe 6, and a circulation valve 60 is arranged on the return pipe 6. When the cleaning liquid is circulated, the sewage valve 40 and the circulation valve 60 are opened, the discharge valve 50 is closed, the centrifugal pump (not shown) enables the cleaning liquid for cleaning the filter element 3 to enter the first filter 7 through the sewage valve 40 for filtration, and the filtered cleaning liquid is returned to the cleaning pool 2 through the circulation valve 60 for circulation. Wherein the first filter 7 is a microfiltration membrane. The first filter 7 is backwashed once every 24 hours of use of the first filter 7 to remove impurities on the first filter 7, thereby improving the service life of the first filter 7.
When the cleaning liquid is intensively discharged and treated, after the cleaning liquid is recycled for 5 times, the sewage valve 40 and the discharge valve 50 are opened, the circulation valve 60 is closed, the cleaning liquid for cleaning the filter element 3 enters the first filter 7 through the sewage valve 40 for treatment, enters the second filter 8 through the discharge valve 50 for treatment, flows out of the water outlet 9, and is finally concentrated and discharged. Wherein the second filter 8 is a multi-effect evaporator.
The test method of the filter element dissolved substances in the embodiment refers to GB/T5750-2001 drinking water sanitation standard and GB/T5750.7-2006 drinking water standard test method organic matter comprehensive index.
Example 4:
sodium carbonate, sodium hydroxide and water are prepared into cleaning liquid at 40 ℃ according to the mass ratio of 20:2:78, the cleaning liquid enters a cleaning pool 2 through a water inlet 1, a filter element 3 is placed in the cleaning pool 2, the cleaning liquid is introduced into the filter element 3 by using a booster pump (not shown in the figure), the filter element 3 is cleaned, and a large amount of surfactant in the filter element is removed through the salting-out effect. The cleaning pressure of the cleaning solution is 0.1MPa, the temperature of the cleaning solution is 40 ℃, and the cleaning time is 2 hours. Subsequently, the pressurizing pump is turned off, the filter element 3 is taken out of the cleaning tank 2 and put into a rinsing tank (not shown in the figure), and a small amount of impurities and cleaning liquid remaining in the filter element 3 are rinsed with pure water. Wherein the rinse water is replaced every 5 hours to ensure that the concentration of impurities in the rinse water is maintained at a low level. After testing, the filter element dissolved-out matter reaches the standard after being cleaned for 20 hours.
The filter element 3 is connected with a first filter 7 through a first drain pipe 4, the first filter 7 is connected with a second filter 8 through a second drain pipe 5, a sewage valve 40 is arranged on the first drain pipe 4, and a discharge valve 50 is arranged on the second drain pipe 5; the first filter 7 is also connected with the cleaning tank 2 through a return pipe 6, and a circulation valve 60 is arranged on the return pipe 6. When the cleaning liquid is circulated, the sewage valve 40 and the circulation valve 60 are opened, the discharge valve 50 is closed, the centrifugal pump (not shown) enables the cleaning liquid for cleaning the filter element 3 to enter the first filter 7 through the sewage valve 40 for filtration, and the filtered cleaning liquid is returned to the cleaning pool 2 through the circulation valve 60 for circulation. Wherein the first filter 7 is a microfiltration membrane. The first filter 7 is backwashed once every 24 hours of use of the first filter 7 to remove impurities on the first filter 7, thereby improving the service life of the first filter 7.
When the cleaning liquid is intensively discharged and treated, after the cleaning liquid is recycled for 5 times, the sewage valve 40 and the discharge valve 50 are opened, the circulation valve 60 is closed, the cleaning liquid for cleaning the filter element 3 enters the first filter 7 through the sewage valve 40 for treatment, enters the second filter 8 through the discharge valve 50 for treatment, flows out of the water outlet 9, and is finally concentrated and discharged. Wherein the second filter 8 is a nanofiltration membrane.
The test method of the filter element dissolved substances in the embodiment refers to GB/T5750-2001 drinking water sanitation standard and GB/T5750.7-2006 drinking water standard test method organic matter comprehensive index.
Claims (12)
1. A method for cleaning a membrane silk surfactant is characterized by comprising the following steps:
a. preparing a cleaning solution according to the following components in percentage by weight:
10% -30% of salt;
1% -5% of alkali;
65% -89% of water;
b. b, introducing the cleaning liquid obtained in the step a into a cleaning pool, and cleaning the surfactant in the filter element;
c. and c, cleaning the filter element cleaned in the step b by using pure water, and finishing cleaning when the dissolved substance of the filter element reaches a set standard.
2. The method for cleaning the membrane wire surfactant according to claim 1, wherein the salt in the step a is one or more of sodium chloride, potassium chloride, magnesium chloride, calcium chloride, sodium nitrate, potassium nitrate, magnesium nitrate, calcium nitrate, sodium sulfate, magnesium sulfate, potassium sulfate, sodium carbonate, potassium carbonate, magnesium carbonate, sodium bicarbonate, potassium bicarbonate and ammonium bicarbonate.
3. The method for cleaning membrane thread surfactant according to claim 1, wherein the alkali in step a is one or more of sodium hydroxide, potassium hydroxide, magnesium hydroxide and calcium hydroxide.
4. The method of cleaning membrane filament surfactant according to claim 1, wherein the filter element is a hollow fiber membrane or a flat sheet membrane.
5. The method for cleaning the membrane yarn surfactant according to claim 1, wherein the material of the filter element is one or more of polyvinylidene fluoride, polyvinyl chloride, polyether sulfone, polysulfone and polyacrylonitrile.
6. The method for cleaning membrane silk surfactant according to claim 1, wherein the surfactant in step b is one or more of cationic surfactant, anionic surfactant and amphoteric surfactant.
7. The method for cleaning membrane wire surfactant according to claim 1, wherein the time for cleaning the filter element by the cleaning solution in the step b is 1-3 hours.
8. The method for cleaning membrane wire surfactant according to claim 1, wherein the filter element in step b is connected with a first filter through a first drain pipe, the first filter is connected with a second filter through a second drain pipe, the first drain pipe is provided with a sewage valve, and the second drain pipe is provided with a discharge valve; the first filter is further connected with the cleaning pool through a return pipe, and a circulating valve is arranged on the return pipe.
9. The method for cleaning the membrane wire surfactant according to claim 8, wherein when the used cleaning solution has less impurities, a sewage valve and a circulation valve are opened, a discharge valve is closed, and the cleaning solution which is cleaned by the filter element enters the first filter through the sewage valve for treatment and then returns to the cleaning pool through the circulation valve for recycling;
when the used cleaning liquid contains more impurities, the circulation valve is closed, the sewage valve and the discharge valve are opened, the cleaning liquid which has cleaned the filter element enters the first filter through the sewage valve for treatment, then enters the second filter through the discharge valve for treatment, and then is discharged in a centralized manner.
10. The method for cleaning membrane thread surfactant according to claims 8-9, wherein the first filter is one or more of a multi-media filter, a screen and a filtering membrane.
11. The method for cleaning membrane wire surfactant according to claim 8-9, wherein when the impurities on the surface of the first filter are more, the impurities on the surface of the first filter are cleaned by adopting a forward washing or back washing mode.
12. The method for cleaning the membrane wire surfactant according to claims 8-9, wherein the second filter treats the cleaning solution by one or more of heating, membrane method, electrochemical method and distillation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811422455.7A CN111214961A (en) | 2018-11-27 | 2018-11-27 | Method for cleaning membrane silk surfactant |
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| CN201811422455.7A CN111214961A (en) | 2018-11-27 | 2018-11-27 | Method for cleaning membrane silk surfactant |
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| CN111214961A true CN111214961A (en) | 2020-06-02 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011125822A (en) * | 2009-12-21 | 2011-06-30 | Toray Ind Inc | Method for washing membrane module and fresh water generator |
| CN102688695A (en) * | 2012-06-28 | 2012-09-26 | 柳州市柳化集团大力透明质酸有限公司 | Regeneration method of filtering membrane for producing hyaluronic acid |
| CN202606042U (en) * | 2012-03-23 | 2012-12-19 | 苏州市新能膜材料科技有限公司 | Membrane cleaning device |
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2018
- 2018-11-27 CN CN201811422455.7A patent/CN111214961A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011125822A (en) * | 2009-12-21 | 2011-06-30 | Toray Ind Inc | Method for washing membrane module and fresh water generator |
| CN202606042U (en) * | 2012-03-23 | 2012-12-19 | 苏州市新能膜材料科技有限公司 | Membrane cleaning device |
| CN102688695A (en) * | 2012-06-28 | 2012-09-26 | 柳州市柳化集团大力透明质酸有限公司 | Regeneration method of filtering membrane for producing hyaluronic acid |
Non-Patent Citations (1)
| Title |
|---|
| 黄玉媛 主编: "《精细化工配方研究与产品配制技术 上》", 30 June 2003, 广州：广东科技出版社 * |
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Application publication date: 20200602 |