CN108176230A - A kind of cleaning method of high salinity brine and seawater cleaning ultrafiltration membrane - Google Patents
A kind of cleaning method of high salinity brine and seawater cleaning ultrafiltration membrane Download PDFInfo
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- CN108176230A CN108176230A CN201711438897.6A CN201711438897A CN108176230A CN 108176230 A CN108176230 A CN 108176230A CN 201711438897 A CN201711438897 A CN 201711438897A CN 108176230 A CN108176230 A CN 108176230A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention provides a kind of high salinity brine and the cleaning method of seawater cleaning ultrafiltration membrane, step includes configuration combination of acidic cleaning agent pickling flush and compound alkaline cleaner alkali cleaning flushing is configured, and completes the cleaning to ultrafiltration membrane；The method is suitable for the cleaning of high salinity brine and seawater cleaning ultrafiltration membrane, the fouling membrane form of the distinctive inorganic pollution package organic contamination of film surface can be directed to, effectively cleaned, the fouling membrane of the distinctive inorganic scale package organic deposition of film surface can efficiently be removed, membrane flux can be made to restore to more than 90% hyperfiltration membrane assembly initial flux, equipment operating pressure is reduced, ensures the stable operation of ultrafiltration membrane treatment high salinity brine and seawater.
Description
Technical field
The present invention relates to a kind of Membrane cleaning methods, are the cleaning sides of a kind of high salinity brine and seawater cleaning ultrafiltration membrane
Method.
Background technology
With the continuous development of industry, membrane technology, which has become, solves Current resource and the major technique hand of environmental problem contradiction
Section, huge development has been obtained in every field such as chemical industry, food, medicine, environmental protection.In brine and seawater refine industry, surpass
Filter technology with its it is simple for process, easy to operate, treatment effeciency is high, effluent quality is good the advantages that be widely applied.Due to halogen
Water and the distinctive water quality characteristic of seawater, such as high salinity, basicity and hardness are higher, and inorganic pollution and organic contamination type are more, water
Matter complexity etc., causing ultrafiltration membrane, fouling membrane gradually aggravates in the process of running, and water yield declines, and conventional physical cleaning is for film
The recovery of flux is undesirable, it is therefore necessary to carry out effective chemical cleaning, restore film properties, prolonging service lifetime of film avoids making
Into irreversible pollution and blocking.
The method of Membrane cleaning generally comprises physical cleaning and chemical cleaning at present.Physical cleaning be using high flow rate water or
The fluid-mixing of air and water rinses film surface, but the method is only effective to polluting the film at initial stage, and cleaning performance cannot be lasting.Chemistry
Cleaning is that certain suitable chemical agent, continuous wash cycles are added in flow.It, should be according to pollution when using chemical cleaning
The characteristic of object and membrane material etc. select best cleaning agent and cleaning method.High salinity brine and seawater salt content
Height, basicity and hardness are big, organic and inorganic dirt of distinctive pollutant absorption shape, microorganism colloidal substance and multiple types
Contaminate object so that the selection of medicament and cleaning sequence are particularly important during ultrafiltration Membrane cleaning, cleaning performance can be directly affected.
As it can be seen that the cleaning method of existing ultrafiltration membrane is relatively simple, cleaning agent in the market is universal cleaning agent, clearly
Washing method does not have specific aim, and during for the ultrafiltration membrane of cleaning treatment high salinity brine and seawater, cleaning performance is bad, ultrafiltration membrane
Permeant flux can only partly restore, it is impossible to meet the cleaning requirement of high salinity brine and seawater cleaning ultrafiltration membrane treatment process.
Invention content
The technical problems to be solved by the invention are to provide a kind of high salinity brine and seawater cleaning ultrafiltration membrane
Cleaning method can effectively clean the inorganic matter of ultrafiltration membrane surface, organic matter, biological pollution.
In order to solve the above technical problems, the technical scheme is that：
The cleaning method of a kind of high salinity brine and seawater cleaning ultrafiltration membrane, is as follows：
(1) combination of acidic cleaning agent is configured：The active ingredient of the acidic cleaner is made of oxalic acid and hydrochloric acid, wherein,
Concentration of oxalic acid is 0.5%-2%, concentration of hydrochloric acid 0.1-0.5%, remaining is water, is obtained by hybrid mode；
(2) pickling：Wash cycles carry out ultrafiltration membrane using step (1) acidic cleaner, stop cycle, leaching after 1h
2h is steeped, repeats the cycle-soaking step 3-10 times；
(3) it rinses：After pickling, with ultrafiltration production water rinse film device, until rinse ultrafiltration membrane after water pH7 ± 0.5 when stop
Only rinse；
(4) compound alkaline cleaner is configured：The active ingredient of alkaline cleaner is made of sodium hydroxide and sodium hypochlorite,
In, naoh concentration 0.1-0.3%, a concentration of 0.2-0.5% of sodium hypochlorite, remaining is water, is obtained by hybrid mode；
(5) alkali cleaning：Wash cycles carry out ultrafiltration membrane using step (4) the alkaline dose of sobriety, stop cycle, leaching after 1h
2h is steeped, repeats the cycle-soaking step 3-10 times；
(6) it rinses：After alkali cleaning, with ultrafiltration production water rinse film device, until rinse ultrafiltration membrane after water pH7 ± 0.5 when stop
It only rinses, completes the cleaning to ultrafiltration membrane.
Preferably, the cleaning method of above-mentioned high salinity brine and seawater cleaning ultrafiltration membrane, it is acid in the step (1)
The concentration of oxalic acid of cleaning agent is 1%, concentration of hydrochloric acid 0.2%.
Preferably, the cleaning method of above-mentioned high salinity brine and seawater cleaning ultrafiltration membrane, pickling in the step (2)
Process control pH is in 1-3, if pH is in the circulating cycle>3, should add acidic cleaner in time meets the requirements pH.
Preferably, the cleaning method of above-mentioned high salinity brine and seawater cleaning ultrafiltration membrane, hydrogen-oxygen in the step (4)
It is 0.2% to change na concn, and sodium hypochlorite effective chlorine density is 0.4%.
Preferably, the cleaning method of above-mentioned high salinity brine and seawater cleaning ultrafiltration membrane, alkali cleaning in the step (5)
Process control sodium hypochlorite effective chlorine is maintained at more than 0.05%, is such as unsatisfactory for, then adding sodium hypochlorite in time meets chlorine residue
It is required that.
The beneficial effects of the invention are as follows：
The cleaning method of above-mentioned high salinity brine and seawater cleaning ultrafiltration membrane, the method are suitable for high salinity halogen
The cleaning of water and seawater cleaning ultrafiltration membrane can be directed to the fouling membrane shape of the distinctive inorganic pollution package organic contamination of film surface
Formula is effectively cleaned, and can efficiently be removed the fouling membrane of the distinctive inorganic scale package organic deposition of film surface, can be made membrane flux
Restore to more than the 90% of hyperfiltration membrane assembly initial flux, reduce equipment operating pressure, ensure ultrafiltration membrane treatment high salinity halogen
The stable operation of water and seawater.
Specific embodiment
Technical solution of the present invention is further described with reference to specific embodiment.
Embodiment 1
High salinity brine (or seawater) is handled after cartridge filter filters into ultra filtration unit.Ultrafiltration list
Member is filtered using the hollow fiber film assembly that material is PVDF, the method for operation using full dose, constant-pressure operation.
At the initial stage of ultra filtration unit filtered wastewater, water temperature be 25 DEG C when, hyperfiltration membrane assembly under operating pressure 0.05MPa,
Membrane flux is 75L/m2h；After high salinity brine is filtered for a period of time, the membrane flux of hyperfiltration membrane assembly will be 50L/m2H, film
It is seriously polluted, it need to stop to ultra-filtration membrane device into brine, into the ultrafiltration membrane cleaning procedure of the present invention, cleaning method is as follows：
(1) combination of acidic cleaning agent is configured：Acidic cleaner is mainly made of oxalic acid and hydrochloric acid, concentration of oxalic acid 1%, salt
Acid concentration is 0.2%, remaining is water, pH 1.9；
(2) pickling：Wash cycles are carried out to ultrafiltration membrane using the acidic cleaner that step (1) is configured, stop following after 1h
Ring impregnates 2h, repeats more than cycle-soaking step 3 times.To ensure the cleaning performance of acid cleaning process, the pH controls of cleaning solution exist
1.5-3, in cleaning process, with reacting for medicament and pollutant, cleaning solution pH has variation by a relatively large margin, should be according to reality
Situation carries out cleaning solution pH measure in every 10 minutes in cyclic process, such as not up to sets pH value, need to add acidic cleaner
The pH of cleaning solution is adjusted to setting value；
(3) it rinses：After pickling, film device is rinsed with ultrafiltration production water, until when rinsing the water pH after ultrafiltration membrane close to 7, is stopped
It only rinses, acid cleaning process terminates；
(4) compound alkaline cleaner is configured：Alkaline cleaner is mainly made of sodium hydroxide and sodium hypochlorite, sodium hydroxide
A concentration of 0.2%, sodium hypochlorite effective chlorine density is 0.4%, remaining is water；
(5) alkali cleaning：Wash cycles are carried out to ultrafiltration membrane using the alkaline cleaner that step (4) is configured, stop following after 1h
Ring impregnates 2h, repeats more than cycle-soaking step 3 times, to ensure the cleaning performance of alkaline cleaning procedure, the effective chlorine of cleaning solution is dense
Degree need to be controlled more than 0.05%, and in cleaning process, with reacting for medicament and pollutant, cleaning solution chlorine residue has by a relatively large margin
Variation, should according to actual conditions in cyclic process every 10 minutes to cleaning solution carry out chlorine residual measurement, as not up to setting more than
Chlorine number need to add sodium hypochlorite and adjust the chlorine residue of cleaning solution to setting value；
(6) it rinses：After alkali cleaning, film device is rinsed with ultrafiltration production water, until when rinsing the water pH after ultrafiltration membrane close to 7, is stopped
It only rinses, completes the cleaning to ultrafiltration membrane.
After above-mentioned chemical cleaning flow, hyperfiltration membrane assembly is under 25 DEG C of water temperature, operating pressure 0.05MPa, membrane flux
Rise to 73.3L/m2H is the 97.7% of Initial operation flux, and cleaning performance protrudes, and ultrafiltration membrane water yield goes up apparent.
Embodiment 2
High salinity brine (or seawater) is handled after cartridge filter filters into ultra filtration unit.Ultrafiltration list
Member is filtered using the hollow fiber film assembly that material is PVDF, the method for operation using full dose, constant-pressure operation.
At the initial stage of ultra filtration unit filtered wastewater, water temperature be 25 DEG C when, hyperfiltration membrane assembly under operating pressure 0.05MPa,
Membrane flux is 75L/m2h；After high salinity brine is filtered for a period of time, the membrane flux of hyperfiltration membrane assembly will be 52L/m2H, film
It is seriously polluted, it need to stop to ultra-filtration membrane device into brine, into the ultrafiltration membrane cleaning procedure of the present invention, cleaning method is as follows：
(1) combination of acidic cleaning agent is configured：Acidic cleaner is mainly made of oxalic acid and hydrochloric acid, concentration of oxalic acid 1%, salt
Acid concentration is 0.2%, remaining is water, pH 1.9；
(2) pickling：Wash cycles are carried out to ultrafiltration membrane using the acidic cleaner that step (1) is configured, stop following after 1h
Ring impregnates 2h, repeats more than cycle-soaking step 3 times.To ensure the cleaning performance of acid cleaning process, the pH controls of cleaning solution exist
1.5-3, in cleaning process, with reacting for medicament and pollutant, cleaning solution pH has variation by a relatively large margin, should be according to reality
Situation carries out cleaning solution pH measure in every 10 minutes in cyclic process, such as not up to sets pH value, need to add acidic cleaner
The pH of cleaning solution is adjusted to setting value；
(3) it rinses：After pickling, film device is rinsed with ultrafiltration production water, until when rinsing the water pH after ultrafiltration membrane close to 7, is stopped
It only rinses, acid cleaning process terminates；
(4) compound alkaline cleaner is configured：Alkaline cleaner is mainly made of sodium hydroxide and sodium hypochlorite, sodium hydroxide
A concentration of 0.1%, sodium hypochlorite effective chlorine density is 0.2%, remaining is water；
(5) alkali cleaning：Wash cycles are carried out to ultrafiltration membrane using the alkaline cleaner that step (4) is configured, stop following after 1h
Ring impregnates 2h, repeats more than cycle-soaking step 3 times, to ensure the cleaning performance of alkaline cleaning procedure, the effective chlorine of cleaning solution is dense
Degree need to be controlled more than 0.05%, and in cleaning process, with reacting for medicament and pollutant, cleaning solution chlorine residue has by a relatively large margin
Variation, should according to actual conditions in cyclic process every 10 minutes to cleaning solution carry out chlorine residual measurement, as not up to setting more than
Chlorine number need to add sodium hypochlorite and adjust the chlorine residue of cleaning solution to setting value；
(6) it rinses：After alkali cleaning, film device is rinsed with ultrafiltration production water, until when rinsing the water pH after ultrafiltration membrane close to 7, is stopped
It only rinses, completes the cleaning to ultrafiltration membrane.
After above-mentioned chemical cleaning flow, hyperfiltration membrane assembly is under 25 DEG C of water temperature, operating pressure 0.05MPa, membrane flux
Rise to 66.5L/m2H is the 88.7% of Initial operation flux, and membrane flux has a certain recovery after cleaning, but also has away from initial flux
Certain gap.
Embodiment 3
High salinity brine (or seawater) is handled after cartridge filter filters into ultra filtration unit.Ultrafiltration list
Member is filtered using the hollow fiber film assembly that material is PVDF, the method for operation using full dose, constant-pressure operation.
At the initial stage of ultra filtration unit filtered wastewater, water temperature be 25 DEG C when, hyperfiltration membrane assembly under operating pressure 0.05MPa,
Membrane flux is 75L/m2h；After high salinity brine is filtered for a period of time, the membrane flux of hyperfiltration membrane assembly will be 49.7L/m2H,
Fouling membrane is serious, need to stop to ultra-filtration membrane device into brine, into the ultrafiltration membrane cleaning procedure of the present invention, cleaning method is as follows：
(1) combination of acidic cleaning agent is configured：Acidic cleaner is mainly made of oxalic acid and hydrochloric acid, concentration of oxalic acid 0.5%,
Concentration of hydrochloric acid is 0.1%, remaining is water, pH 2.3；
(2) pickling：Wash cycles are carried out to ultrafiltration membrane using the acidic cleaner that step (1) is configured, stop following after 1h
Ring impregnates 2h, repeats more than cycle-soaking step 3 times.To ensure the cleaning performance of acid cleaning process, the pH controls of cleaning solution exist
1.5-3, in cleaning process, with reacting for medicament and pollutant, cleaning solution pH has variation by a relatively large margin, should be according to reality
Situation carries out cleaning solution pH measure in every 10 minutes in cyclic process, such as not up to sets pH value, need to add acidic cleaner
The pH of cleaning solution is adjusted to setting value；
(3) it rinses：After pickling, film device is rinsed with ultrafiltration production water, until when rinsing the water pH after ultrafiltration membrane close to 7, is stopped
It only rinses, acid cleaning process terminates；
(4) compound alkaline cleaner is configured：Alkaline cleaner is mainly made of sodium hydroxide and sodium hypochlorite, sodium hydroxide
A concentration of 0.2%, sodium hypochlorite effective chlorine density is 0.4%, remaining is water；
(5) alkali cleaning：Wash cycles are carried out to ultrafiltration membrane using the alkaline cleaner that step (4) is configured, stop following after 1h
Ring impregnates 2h, repeats more than cycle-soaking step 3 times, to ensure the cleaning performance of alkaline cleaning procedure, the effective chlorine of cleaning solution is dense
Degree need to be controlled more than 0.05%, and in cleaning process, with reacting for medicament and pollutant, cleaning solution chlorine residue has by a relatively large margin
Variation, should according to actual conditions in cyclic process every 10 minutes to cleaning solution carry out chlorine residual measurement, as not up to setting more than
Chlorine number need to add sodium hypochlorite and adjust the chlorine residue of cleaning solution to setting value；
(6) it rinses：After alkali cleaning, film device is rinsed with ultrafiltration production water, until when rinsing the water pH after ultrafiltration membrane close to 7, is stopped
It only rinses, completes the cleaning to ultrafiltration membrane.
After above-mentioned chemical cleaning flow, hyperfiltration membrane assembly is under 25 DEG C of water temperature, operating pressure 0.05MPa, membrane flux
Rise to 61.2L/m2H is the 81.6% of Initial operation flux, and membrane flux has a certain recovery after cleaning, but also has away from initial flux
Certain gap.
Embodiment 4
High salinity brine (or seawater) is handled after cartridge filter filters into ultra filtration unit.Ultrafiltration list
Member is filtered using the hollow fiber film assembly that material is PVDF, the method for operation using full dose, constant-pressure operation.
At the initial stage of ultra filtration unit filtered wastewater, water temperature be 25 DEG C when, hyperfiltration membrane assembly under operating pressure 0.05MPa,
Membrane flux is 75L/m2h；After high salinity brine is filtered for a period of time, the membrane flux of hyperfiltration membrane assembly will be 50L/m2H, film
It is seriously polluted, it need to stop to ultra-filtration membrane device into brine, into the ultrafiltration membrane cleaning procedure of the present invention, cleaning method is as follows：
(1) compound alkaline cleaner is configured：Alkaline cleaner is mainly made of sodium hydroxide and sodium hypochlorite, sodium hydroxide
A concentration of 0.2%, sodium hypochlorite effective chlorine density is 0.4%, remaining is water；
(2) alkali cleaning：Wash cycles are carried out to ultrafiltration membrane using the alkaline cleaner that step (1) is configured, stop following after 1h
Ring impregnates 2h, repeats more than cycle-soaking step 3 times, to ensure the cleaning performance of alkaline cleaning procedure, the effective chlorine of cleaning solution is dense
Degree need to be controlled more than 0.05%, and in cleaning process, with reacting for medicament and pollutant, cleaning solution chlorine residue has by a relatively large margin
Variation, should according to actual conditions in cyclic process every 10 minutes to cleaning solution carry out chlorine residual measurement, as not up to setting more than
Chlorine number need to add sodium hypochlorite and adjust the chlorine residue of cleaning solution to setting value；
(3) it rinses：After alkali cleaning, film device is rinsed with ultrafiltration production water, until when rinsing the water pH after ultrafiltration membrane close to 7, is stopped
It only rinses, alkaline cleaning procedure terminates；
(4) combination of acidic cleaning agent is configured：Acidic cleaner is mainly made of oxalic acid and hydrochloric acid, concentration of oxalic acid 1%, salt
Acid concentration is 0.2%, remaining is water, pH 1.9；
(5) pickling：Wash cycles are carried out to ultrafiltration membrane using the acidic cleaner that step (4) is configured, stop following after 1h
Ring impregnates 2h, repeats more than cycle-soaking step 3 times.To ensure the cleaning performance of acid cleaning process, the pH controls of cleaning solution exist
1.5-3, in cleaning process, with reacting for medicament and pollutant, cleaning solution pH has variation by a relatively large margin, should be according to reality
Situation carries out cleaning solution pH measure in every 10 minutes in cyclic process, such as not up to sets pH value, need to add acidic cleaner
The pH of cleaning solution is adjusted to setting value；
(6) it rinses：After pickling, film device is rinsed with ultrafiltration production water, until when rinsing the water pH after ultrafiltration membrane close to 7, is stopped
It only rinses, acid cleaning process terminates, and completes the cleaning to ultrafiltration membrane.
After above-mentioned chemical cleaning flow, hyperfiltration membrane assembly is under 25 DEG C of water temperature, operating pressure 0.05MPa, membrane flux
For 55L/m2The 73.3% of h, only Initial operation flux, flux significantly do not go up, cleaning performance unobvious.
It can be seen that the pollution of the brine and seawater ultrafiltration membrane for high salinity from above 4 embodiments, pollute
Form is mainly the fouling membrane form of inorganic pollution package organic contamination, and therefore, in cleaning, the cleaning of alkali cleaning is suitable after first pickling
Sequence is extremely important, and pickling can will first be wrapped in outermost inorganic pollution and effectively remove, then for internal layer organic contamination and
Biological pollution carries out alkali cleaning, then can effectively restore membrane flux.Meanwhile for the pollution, the type of complex cleaning and washing agent and configuration
Concentration is also very important.
It is above-mentioned to be retouched in detail to what a kind of cleaning method of high salinity bittern purifying ultrafiltration membrane carried out with reference to embodiment
It states, is illustrative rather than limited, several embodiments can be enumerated according to limited range, therefore do not departing from this
Change and modification under invention general plotting should belong within protection scope of the present invention.
Claims (5)
1. a kind of cleaning method of high salinity brine and seawater cleaning ultrafiltration membrane, it is characterised in that：It is as follows：
(1) combination of acidic cleaning agent is configured：The active ingredient of the acidic cleaner is made of oxalic acid and hydrochloric acid, wherein, oxalic acid
A concentration of 0.5%-2%, concentration of hydrochloric acid 0.1-0.5%, remaining is water, is obtained by hybrid mode；
(2) pickling：Wash cycles carry out ultrafiltration membrane using step (1) acidic cleaner, stops cycle after 1h, impregnates
2h repeats the cycle-soaking step 3-10 times；
(3) it rinses：After pickling, film device is rinsed with ultrafiltration production water, until stopping punching when rinsing water pH7 ± 0.5 after ultrafiltration membrane
It washes；
(4) compound alkaline cleaner is configured：The active ingredient of alkaline cleaner is made of sodium hydroxide and sodium hypochlorite, wherein,
Naoh concentration is 0.1-0.3%, and a concentration of 0.2-0.5% of sodium hypochlorite, remaining is water, is obtained by hybrid mode；
(5) alkali cleaning：Wash cycles carry out ultrafiltration membrane using step (4) the alkaline dose of sobriety, stops cycle after 1h, impregnates
2h repeats the cycle-soaking step 3-10 times；
(6) it rinses：After alkali cleaning, film device is rinsed with ultrafiltration production water, until stopping punching when rinsing water pH7 ± 0.5 after ultrafiltration membrane
It washes, completes the cleaning to ultrafiltration membrane.
2. the cleaning method of high salinity brine according to claim 1 and seawater cleaning ultrafiltration membrane, it is characterised in that：
The concentration of oxalic acid of acidic cleaner is 1% in the step (1), concentration of hydrochloric acid 0.2%.
3. the cleaning method of high salinity brine according to claim 1 and seawater cleaning ultrafiltration membrane, it is characterised in that：
Acid cleaning process controls pH in 1-3 in the step (2).
4. the cleaning method of high salinity brine according to claim 1 and seawater cleaning ultrafiltration membrane, it is characterised in that：
Naoh concentration is 0.2% in the step (4), and sodium hypochlorite effective chlorine density is 0.4%.
5. the cleaning method of high salinity brine according to claim 1 and seawater cleaning ultrafiltration membrane, it is characterised in that：
Alkaline cleaning procedure control sodium hypochlorite effective chlorine is maintained at more than 0.05% in the step (5).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112473390A (en) * | 2020-12-18 | 2021-03-12 | 攀钢集团重庆钛业有限公司 | Ultrafiltration membrane cleaning agent and cleaning method thereof |
| CN112569656A (en) * | 2020-12-12 | 2021-03-30 | 山东海化集团有限公司 | Method for cleaning cartridge filter element of cartridge filter in brine system |
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| CN102485328A (en) * | 2010-12-02 | 2012-06-06 | 东丽纤维研究所（中国）有限公司 | Cleaning method of immersion membrane filtration system |
| CN107261852A (en) * | 2017-08-18 | 2017-10-20 | 北京博大水务有限公司 | A kind of cleaning equipment and cleaning method of iron pollution micro-filtration/milipore filter |
| KR20170126359A (en) * | 2016-05-09 | 2017-11-17 | 경희대학교 산학협력단 | Method for estimating cleaning efficiency of membrane |
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| CN102397752A (en) * | 2010-09-09 | 2012-04-04 | 山西太钢不锈钢股份有限公司 | Method for cleaning ultrafiltration membrane |
| CN102485328A (en) * | 2010-12-02 | 2012-06-06 | 东丽纤维研究所（中国）有限公司 | Cleaning method of immersion membrane filtration system |
| KR20170126359A (en) * | 2016-05-09 | 2017-11-17 | 경희대학교 산학협력단 | Method for estimating cleaning efficiency of membrane |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112569656A (en) * | 2020-12-12 | 2021-03-30 | 山东海化集团有限公司 | Method for cleaning cartridge filter element of cartridge filter in brine system |
| CN112473390A (en) * | 2020-12-18 | 2021-03-12 | 攀钢集团重庆钛业有限公司 | Ultrafiltration membrane cleaning agent and cleaning method thereof |
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Application publication date: 20180619 |