CN101596410B - Cleaning method of reverse osmosis membrane of steel recycled water membrane method desalting system - Google Patents
Cleaning method of reverse osmosis membrane of steel recycled water membrane method desalting system Download PDFInfo
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- CN101596410B CN101596410B CN200910088138A CN200910088138A CN101596410B CN 101596410 B CN101596410 B CN 101596410B CN 200910088138 A CN200910088138 A CN 200910088138A CN 200910088138 A CN200910088138 A CN 200910088138A CN 101596410 B CN101596410 B CN 101596410B
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- reverse osmosis
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- desalting system
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The invention is a cleaning method of reverse osmosis membrane of a steel recycled water membran method desalting system, belonging to the technical field of steel recycled water desalting. The method comprises the following steps: automatically adding alkaline washing liquid in a running membran method desalting system to wash the organism, silicon dioxide, polymer of aluminum sulfate or aluminum chloride and pollutant of calcium, magnesium, iron, aluminum ion and the like on the reverse osmosis membrane at regular time, then washing rapidly by reverse osmosis producing water; or adding acid washing liquid to clear up calcium bicarbonate, magnesium bicarbonate incrustation, aluminate or aluminium hydroxide floc, metallic oxide and microorganism, then washing rapidly by the reverse osmosis producing water. One time washing is carried out when the desalting system runs 6-24h, and acid washing and alkali washing are carried out alternately. The method provided by the invention has the advantages that the reverse osmosis water flux and differential pressure can be restored without affecting production with less drug consumption, convenience and effectiveness, due to the short washing time in each time.
Description
Technical field
The invention belongs to water desalination technical field in the iron and steel; Be particularly related to the cleaning method of moisture film method desalting system reverse osmosis membrane in a kind of iron and steel, be applicable to the cleaning of water desalting system reverse osmosis membrane in the iron and steel that after the clarification process preliminary treatment that with aluminium salt is coagulant, carries out the embrane method desalination.
Background technology
Reusing sewage is that iron and steel enterprise realizes an important channel of " water-saving and emission-reducing ".At present, domestic iron company be mostly to composite wastewater (containing the factory effluent that is no more than 30% sanitary sewage) adopt lime softening-clarification-filtration-sterilization process carries out the reuse of embrane method desalination after reaching recycle-water (or being water in the iron and steel) requirement.
Owing to generally will add the fluorite that contains fluorine element in ironmaking and the steelmaking process, the part fluorine element gets in the sewage.In order to remove the fluorine ion in the steel iron wastewater, will in sewage, add aluminium in the clarification stage usually is coagulant, because the incomplete meeting of reaction residual aluminum ion; And follow-up filtration often is difficult to directly remove; Cause in the iron and steel in the water aluminium ion higher, make the seriously polluted of reverse osmosis membrane in the follow-up desalting system, pressure reduction rises; Salt rejection rate, aquifer yield descend, and clean frequent.
Present certain cleaning method generally is that pickling and alkali cleaning are carried out continuously, often need soak a period of time; Cleaning frequency is long; Cost is lower, and aluminium ion is higher to make the with serious pollution problem of reverse osmosis membrane in the follow-up desalting system but can not effectively solve in the water, bigger to producing influence.
Summary of the invention
The object of the present invention is to provide the cleaning method of moisture film method desalting system reverse osmosis membrane in a kind of iron and steel, the cleaning frequency that has overcome prior art is long, can not solve effectively in the water that aluminium ion is higher to make the with serious pollution problem of reverse osmosis membrane in the follow-up desalting system.Improve the cycle of operation and efficient, ensure the economic stability operation of the two embrane method desalting systems of water in the iron and steel, realize steel iron wastewater resource and sewage " zero-emission ".
The technical scheme that the present invention adopted is: the characteristic that has both sexes according to aluminium salt; The chemical characteristic that under the higher and on the low side condition of pH value, all can dissolve; At the embrane method desalting system timing automatic pollutants such as polymer, calcium, magnesium, iron, aluminium ion that alkaline cleaning fluid cleans organic matter, silica, aluminum sulfate or aluminium chloride on the reverse osmosis membrane that add in service, get express developed with reverse osmosis produced water again; Perhaps add acidic cleaning solution and remove calcium bicarbonate, bicarbonate magne-scale, aluminate or aluminium hydroxide flco, metal oxide, microorganism, get express developed with reverse osmosis produced water again.Through cleaning so that in time eliminate the accumulation of dirt, it is stifled to prevent irreversible dirt.The desalting system operation was once cleaned in 6～24 hours, and pickling and alkali cleaning hocket.Specifically may further comprise the steps:
A. be 20～30 ℃ in temperature and add acidity (or alkalescence) cleaning fluid and carry out pickling (or alkali cleaning), cleaned 10～30 minutes;
B. with reverse osmosis produced water flushing 5～15 minutes;
C. desalting system operation is after 6～24 hours, is 20～30 ℃ in temperature and adds alkalescence (or acid) cleaning fluid and carry out alkali cleaning (or pickling), cleans 10～30 minutes; Carry out step B again.
Acidic cleaning solution of the present invention is to be mixed with the HCl solution that weight ratio is 0.5%～10% NaClO, pH=1.5～3.0
Alkali cleaning cleaning fluid of the present invention is to be mixed with the NaOH solution that weight ratio is 0.1%～2.0% EDTA-4Na, pH=11.0～13.0
The demineralized water that described acidic cleaning solution and/or alkali cleaning cleaning fluid are produced with counter-infiltration system is formulated.
Described scavenging period of the present invention is 10～30 minutes, and the reverse osmosis water washing time is 5～15 minutes.
The cycle of operation of described desalting system of the present invention is 6～24 hours.
The invention has the advantages that, because pickling and alkali cleaning hocketed at interval in 6～24 hours, need not soak, and each scavenging period is very short, the water flux of counter-infiltration and pressure reduction were well recovered, do not influence production again, the medicine consumption is few, simple and effective.Be particularly useful for after the clarification process preliminary treatment that with aluminium salt is coagulant, carrying out the cleaning of water desalting system reverse osmosis membrane in the iron and steel of embrane method desalination, also be applicable to the cleaning of the desalting system reverse osmosis membrane that aluminium composition in the water is higher.
The specific embodiment
Embodiment 1
The iron and steel composite wastewater that certain iron company mixes smelting, rolling effluent and all the other about sanitary sewages of about 24% through coarse rack-fine fack-lime softening-after high dense settling pond-pH adjusting-V-type filter tank-add NaClO disinfects, produce into suspension less than 20mg/L, COD
CrLess than 30mg/L, mineral oil less than 3mg/L, temporary hardness less than water in the iron and steel of 100mg/L, chlorine residue 0.5mg/L, selecting quartz sand again for use is filtrate and the FeCl that adds 3～10mg/L
3(ferric trichloride) carries out micro flocculating filter, is the laminated filter processing of 55 μ m again through filtering accuracy.To pass through pretreated water and handle through the inner pressed ultrafiltration apparatus earlier, and reach the requirement of SDI≤2, be to get into reverse osmosis unit and carry out desalination and handle with the high-pressure pump back of boosting behind the accurate filter of 5 μ m through precision again.The counter-infiltration operating pressure is generally at 1.4～1.8MPa; After moving in the reverse osmosis membrane group leader phase; Can receive the pollution that some is difficult to rinse out, cause the membrane module performance decrease like long-term micro-salt fouling and organic accumulation, operating pressure raises; So must clean with chemicals, to recover its normal desalination ability.Because this project requires the feed water by reverse osmosis aluminium composition should be greater than 0.05mg/L, and aluminium composition is 0.41mg/L in the actual feed water by reverse osmosis, exceeds standard more than 8 times.The said firm is employed in the embrane method desalting system timing automatic pollutants such as polymer, calcium, magnesium, iron, aluminium ion that alkaline cleaning fluid cleans organic matter, silica, aluminum sulfate or aluminium chloride on the reverse osmosis membrane that add in service, gets express developed with reverse osmosis produced water again; Perhaps add acidic cleaning solution and remove calcium bicarbonate, bicarbonate magne-scale, aluminate or aluminium hydroxide flco, metal oxide, microorganism, get express developed with reverse osmosis produced water again.The desalting system operation was once cleaned in 8 hours, and alkali cleaning and pickling hocket.Its cleaning step is following:
A. be 22 ℃ in temperature and add and be mixed with the NaOH solution that weight ratio is 0.5% EDTA-4Na that pH=11.0 carries out alkali cleaning, cleans 10 minutes;
B. with reverse osmosis produced water flushing 5 minutes.
After desalting system moves 8 hours, carry out following cleaning step again:
C. be 22 ℃ in temperature and add and be mixed with the HCl solution that weight ratio is 5% NaClO that pH=2.0 carries out pickling, cleans 30 minutes;
D. with reverse osmosis produced water flushing 10 minutes.
Embodiment 2
Certain iron company will smelt, rolling effluent through coarse rack-fine fack-lime soften-clarify-filter-add after NaClO disinfects; Be prepared into water in the iron and steel; Handling through micro-filtration, is to get into reverse osmosis unit and carry out desalination and handle with the high-pressure pump back of boosting behind the accurate filter of 5 μ m through precision again.The said firm is employed in the embrane method desalting system timing automatic acidic cleaning solution that adds in service and removes calcium bicarbonate, bicarbonate magne-scale, aluminate or aluminium hydroxide flco, metal oxide, microorganism, gets express developed with reverse osmosis produced water again; Perhaps add alkaline cleaning fluid and clean the pollutants such as polymer, calcium, magnesium, iron, aluminium ion of organic matter, silica, aluminum sulfate or aluminium chloride on the reverse osmosis membrane, get express developed with reverse osmosis produced water again.The desalting system operation was once cleaned in 24 hours, and pickling and alkali cleaning hocket.Its cleaning step is following:
A. be 30 ℃ in temperature and add and be mixed with the HCl solution that weight ratio is 8% NaClO that pH=2.5 carries out pickling, cleans 20 minutes;
B. with reverse osmosis produced water flushing 8 minutes.
After desalting system moves 24 hours, carry out following cleaning step again:
C. be 30 ℃ in temperature and add and be mixed with the NaOH solution that weight ratio is 2% EDTA-4Na that pH=13.0 carries out alkali cleaning, cleans 10 minutes;
D. with reverse osmosis produced water flushing 10 minutes.
Adopt method of the present invention, because pickling and alkali cleaning interval hocketed in 6～24 hours, and each scavenging period is very short; The water flux and the pressure reduction of counter-infiltration were well recovered, improved the cycle of operation and efficient, do not influenced production again; The medicine consumption is few, simple and effective.
The above is merely the preferable specific embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses, and the variation that can carry out easily all should be encompassed in protection scope of the present invention.
Claims (4)
1. the cleaning method of moisture film method desalting system reverse osmosis membrane in the iron and steel is characterized in that, comprises the steps:
A. be 20～30 ℃ in temperature and add acidic cleaning solution and carry out pickling, cleaned 10～30 minutes;
B. with reverse osmosis produced water flushing 5～15 minutes;
C. desalting system operation is after 6～24 hours, is 20～30 ℃ in temperature and adds alkaline cleaning fluid and carry out alkali cleaning, cleans 10～30 minutes; Carry out step B again.
2. the cleaning method of moisture film method desalting system reverse osmosis membrane in the iron and steel is characterized in that, comprises the steps:
A. be 20～30 ℃ in temperature and add alkaline cleaning fluid and carry out alkali cleaning, cleaned 10～30 minutes;
B. with reverse osmosis produced water flushing 5～15 minutes;
C. desalting system operation is after 6～24 hours, is 20～30 ℃ in temperature and adds acidic cleaning solution and carry out pickling, cleans 10～30 minutes; Carry out step B again.
3. method according to claim 1 and 2 is characterized in that, described acidic cleaning solution is to be mixed with the HCl solution that weight ratio is 0.5%～10% NaClO, pH=1.5～3.0.
4. method according to claim 1 and 2 is characterized in that, described alkali cleaning cleaning fluid is to be mixed with the NaOH solution that weight ratio is 0.1%～2.0% EDTA-4Na, pH=11.0～13.0.
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| CN101596410B true CN101596410B (en) | 2012-09-05 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102161539A (en) * | 2010-06-23 | 2011-08-24 | 隆润新技术发展有限公司 | Application of combined technology of high-density filtering pond and V-shaped filtering pond in deep processing method of coking wastewater |
| CN102030437B (en) * | 2010-11-04 | 2012-11-21 | 河北省首钢迁安钢铁有限责任公司 | Method for comprehensive wastewater desalination and zero pollution release in steel production |
| CN102847443A (en) * | 2011-06-28 | 2013-01-02 | 苏州顶裕水务科技有限公司 | Formulation of cleaning fluid for ultrafiltration membrane |
| JP5798908B2 (en) * | 2011-12-19 | 2015-10-21 | 株式会社日立製作所 | Reverse osmosis treatment device and cleaning method for reverse osmosis treatment device |
| EP3159311A1 (en) * | 2015-10-21 | 2017-04-26 | ItN Nanovation AG | Method for cleaning a membrane of a filtration plant for water treatment |
| CN105536549B (en) * | 2015-12-18 | 2018-04-20 | 无锡德宝水务投资有限公司 | A kind of cleaning method of the fluorine-containing nitrogen-containing wastewater processing reverse osmosis membrane apparatus of electronics industry |
| CN107261854B (en) * | 2017-08-09 | 2020-09-15 | 广州环投环境服务有限公司 | Method for cleaning membrane in leachate treatment process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001038359A (en) * | 1999-07-28 | 2001-02-13 | Japan Organo Co Ltd | Deionized water production and device therefor |
| CN101224391A (en) * | 2007-10-17 | 2008-07-23 | 中国铝业股份有限公司 | Water curing reverse osmosis membrane chemical cleaning method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001038359A (en) * | 1999-07-28 | 2001-02-13 | Japan Organo Co Ltd | Deionized water production and device therefor |
| CN101224391A (en) * | 2007-10-17 | 2008-07-23 | 中国铝业股份有限公司 | Water curing reverse osmosis membrane chemical cleaning method |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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