CN108187501A - A kind of cleaning method of reverse osmosis membrane system organic pollution - Google Patents
A kind of cleaning method of reverse osmosis membrane system organic pollution Download PDFInfo
- Publication number
- CN108187501A CN108187501A CN201810006399.2A CN201810006399A CN108187501A CN 108187501 A CN108187501 A CN 108187501A CN 201810006399 A CN201810006399 A CN 201810006399A CN 108187501 A CN108187501 A CN 108187501A
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- cleaning
- reverse osmosis
- sterilization
- osmosis 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
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- 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
- B01D65/022—Membrane sterilisation
-
- 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
- B01D2321/162—Use of acids
-
- 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
-
- 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
- B01D2321/168—Use of other chemical agents
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The present invention is a kind of cleaning method of reverse osmosis membrane system organic pollution, reverse osmosis membrane system is combined, while complete cleaning process using the cleaning way that low discharge cycle high flow capacity circulation immersion circulation flushing is combined using sterilization alkali cleaning pickling sterilization；Pass through the cleaning method, the properties of reverse osmosis unit are recovered immediately, salt rejection rate, output are restored to design level, production water power is led less than 20 us/cm, and due to cleaning systems it is complete after using membrane sterilization agent in system circulation 30 minutes, certain density membrane sterilization agent is also added in dosing is run, the effective growth for inhibiting microorganism, bacterium etc., reverse osmosis run time is extended, reduces Membrane cleaning number, is conducive to extend reverse osmosis membrane service life.
Description
Technical field
The present invention relates to reverse osmosis technology Membrane cleaning field, the cleaning of specifically a kind of reverse osmosis membrane system organic pollution
Method.
Background technology
It is well known that the world today is most universal and most energy saving effective membrane separation technique is exactly reverse osmosis technology, reverse osmosis
Saturating technology commonly used in the sofening treatment of water, medical industry, the purification of chemical industry, concentration, separation, seawater and brackish water it is light
Water etc..
Reverse osmosis technology principle is under the effect higher than solution osmotic pressure, and semi-permeable membrane cannot be penetrated according to other substances
And separate these substances and water, but since the membrane aperture of reverse osmosis membrane is very small, so can effectively go to remove water
In dissolved salts, microorganism, organic matter, colloid etc., therefore system has that water quality is good, energy consumption two is low, pollution-free, operation letter
The advantages that single, simple for process.
In today of water resource worsening shortages, Treated sewage reusing becomes the water-saving mode that country advocates and supports energetically.Raw water
It is removed during according to ruisseau water in municipal middle water, cities and towns or the water of other high organic contents, in raw water and contains a certain concentration
Suspended matter and dissolved matter, also containing certain density organic matter and bacterium.
In reverse osmosis operational process, as film cuts suspended matter, dissolved matter, organic matter and bacterium in water inlet
It stays, suspended particulate can be deposited on film surface, block water inlet flow channel, increase frictional resistance.Difficulty soluble salt is then more than its saturation limit
When, it is precipitated out from concentrated water, fouling is formed on film surface, reduce the flux of film, increase operating pressure and pressure drop, and cause
Product deteriorating water quality.It is this be called fouling membrane sedimentary is formed on film surface the phenomenon that, fouling membrane the result is that system performance
Deterioration.
In order to improve the pollution condition of reverse osmosis membrane, scavenger specially can be used and cleaned.At present, it is conventional on the market to adopt
It is single acid cleaner or alkaline cleaner.Cleaning way generally rinses --- -- and impregnates, and this mode is for general
The pollution of reverse osmosis membrane has certain cleaning performance, and the reverse osmosis membrane of organic matter and germ contamination is not imitated then substantially
Fruit.The indices performance of film can not also return to original state.
Invention content
The present invention is in view of the deficienciess of the prior art, provide a kind of cleaning method of reverse osmosis membrane system organic pollution.
Thus the technical scheme is that, a kind of cleaning method of reverse osmosis membrane system organic pollution, including various
The cleaning method of reverse osmosis membrane system organic pollution being combined using sterilization with cleaning changes in flow rate, it is characterised in that：It will
Reverse osmosis membrane system is combined using sterilization-alkali cleaning-pickling-sterilization, while recycles --- high flow capacity cycle --- using low discharge
Impregnating --- cleaning way that-circulation flushing is combined completes cleaning process；
The specific steps are：
Flushing before the first step, cleaning：Reverse osmosis membrane system is rinsed until concentrated water discharge mouth conductance is less than twice through water with RO
Water inlet electric conductivity value；
Second step, soda acid wash preceding sterilization；It is recycled in reverse osmosis membrane system 2 hours with 300ppm membrane sterilization agent；
Third step, alkali cleaning：With 0.025% dodecyl sodium sulfate low discharge recycle 30 minutes, then high flow capacity recycle 1 hour, during which
PH value is adjusted 12.7 with NaOH, is finally impregnated 8~24 hours Posterior circles and is rinsed；
4th step, pickling：Recycled 1 hour with 2% or so Citric Acid Mono, it is rear to impregnate 1 hour, after continue cycling through 1 hour, during which
PH value is adjusted between 1~2 with Citric Acid Mono；
5th step, soda acid are sterilized after washing：With the agent of 300ppm membrane sterilizations cleaning process is completed in system circulation within 30 minutes.
Advantage of the invention is that：
Soda acid uses membrane sterilization agent that the microbial film on reverse osmosis membrane system dirt surface layer can effectively be promoted to break ring and peel off before washing, and prevents
Only microbial film is not peeled off not only and is fastened further instead in cleaning process, so as to substantially reduce cleaning performance.
It can effectively inhibit the life of microorganism, bacterium etc. in system circulation 30 minutes using membrane sterilization agent after cleaning systems are complete
It is long, be conducive to keep cleaning performance；Period is mainly used for organics removal, sludge using alkali cleaning and other is attached to film surface
Particle, be mainly used for removing inorganic salt crust etc. using pickling；As for the sequence of pickling and alkali cleaning, determine alkali cleaning being located at first
Step, in order to prevent the microbial film peeled off from being fastened in acid cleaning process.Meanwhile it is followed in cleaning process using low discharge
--- high flow capacity cycle --- immersion --- cleaning way that-circulation flushing is combined, cleaning temperature control always in 35 DEG C of temperature ring
Left and right can effectively rinse dirt, microbial film and the other dissolved matter matter for taking away film surface peeling, greatly improve cleaning performance.
The notable cleaning performance of the present invention is, by the cleaning method, the properties of reverse osmosis unit obtain
To recovering immediately, salt rejection rate, output are restored to design level, and production water power is led less than 20 us/cm, and since cleaning systems are complete
Certain density membrane sterilization agent is also added in dosing run, effective suppression in system circulation 30 minutes using membrane sterilization agent afterwards
The growth of microorganism, bacterium etc. has been made, has extended reverse osmosis run time, has reduced Membrane cleaning number, has been conducive to extend reverse osmosis
Permeable membrane service life.
Specific embodiment
The present invention is got information about for those skilled in the art is allowed to be more clear, the present invention will be made below further
Illustrate, but protection scope of the present invention is not limited to that：
The thinking being combined using sterilization-alkali cleaning-pickling-sterilization, while using low discharge cycle --- high flow capacity cycle --- leaching
Bubble --- cleaning way that-circulation flushing is combined completes cleaning process.
Embodiment
1st, cleaning solution is configured
Cleaning solution configuration amount can be calculated according to following method：Every 8 inches of membrane component target cleaning fluid volumes are 80L.
The total amount of cleaning solution consists of the following components：Water tank capacity is cleaned, volume and detergent line in pressure vessel
Volume in system.
Specifically 1 is shown in Table with concentration：
The configuration concentration of 1 wash agent of table
。
2nd, the flushing before cleaning
Counter-infiltration system is rinsed through water with reverse osmosis, opens concentrated water discharge valve and production water discharging valve, flow is according to flush water pump
Depending on, but 75m3/h is not exceeded, confirm pressure<0.3MPa, until less than twice water inlet electric conductivity value of concentrated water discharge mouth conductance.
3rd, soda acid washes preceding sterilization
Bactericidal agent is prepared according to table 1, injects bactericidal agent to system, starts half of the flow control in desired value（About 40m3/
h）, pay attention to pressure<0.3MPa recycled 2 hours, puts net bactericidal agent, with demineralized water rinse-system 30 minutes.
4th, alkali cleaning
The cleaning solution of alkali cleaning is configured according to table 1.Cleaning solution is injected to system, starts flushing water pump, flow control is in desired value
Half（About 40m3/h）, pay attention to pressure<0.3MPa, the water discharge of initial stage concentrated water outlet, until discharge water pH value is left close to 12.7
Pipeline switching is flowed back into ejected wash water case cycle, if pH is decrease beyond more than 0.5 unit, supplements NaOH and tie up pH by the right side
It holds 12.7 or so.Low discharge recycles：Above-mentioned cleaning flow is maintained, treats that pH stablizes relatively, recycles 30 minutes, pay attention to pressure<
0.3MPa；High flow capacity recycles：Flow is increased to 70m3/h（Depending on cleaning pump water supply capacity）, recycle 1 hour, pay attention to pressure
<0.3MPa.According to the variation of cleaning solution color, extend scavenging period as one sees fit.It impregnates：Stop cleaning pump, close cleaning terminal valve
Door impregnates 8~24 hours, depending on actual conditions.Circulation flushing：Cleaning pump is opened, flow gradually rises to 70m3/h, follows
Ring 1 hour, pays attention to pressure<0.3MPa.If pH is less than 12.7 hereinafter, NaOH must be replenished in time in cyclic process, pH value is tieed up
It holds to 12.7 or so.Clear water rinses：Cleaning solution is discharged, is then rinsed using demineralized water, pressure<0.3MPa, until concentrated water conductance is low
In twice of water inlet conductance or relief liquor PH<9.
Alkaline cleaning procedure pays attention at 4 points：First, cleaning solution temperature should be maintained at 30~35 alwaysoC；Second is that Yehmen (ying-Spring point SJ 2) is returned in production water side
It opens, prevents back pressure excessively high；Third, variation and the degree of fouling of observation discharge cleaning solution color, if cleaning solution color is deeper
It is dirtier, then cleaning system and reverse osmosis cleaning liquid inside should be vented, cleaning of making up a prescription again repeats caustic scrubbing step；Fourth, according to anti-
One, two section of dirt of infiltration blocks up feature to clean.
5th, pickling
It cleans and Citric Acid Mono cleaning solution is prepared in water tank, pH value is controlled 1~2；Cleaning solution is injected to system：Start cleaning
Water pump, flow control is in half of target cleaning flow or so（About 40m3/h）, pay attention to pressure<0.3MPa, due to former pipeline system
The dilution of water in system, cleaning solution pH value can increase, and need to add Citric Acid Mono by amount at this time, maintain pH to 1~2；Circulating flushing
It washes：It treats that pH stablizes relatively, and confirms that air is effectively emptied in system, cleaning flow is risen into 70m3/h（It is supplied according to cleaning pump
Depending on outlet capacity）, confirm pressure<0.3MPa, circulation flushing 60min in the process, monitor pH and are maintained at 1~2；It impregnates：
Termination of pumping is closed, and impregnates 60min or longer；Circulation flushing：Keep cleaning flow 70m3/h, pressure<0.3MPa, if cycle initial stage pH
There is rising, require supplementation with Citric Acid Mono medicament, 60min is rinsed from pH stabilizations, in the process, monitor pH and be maintained at 1
~2 or so；Clear water rinses：Cleaning solution is discharged, is then rinsed using demineralized water, pressure<0.3MPa, until concentrated water conductance is less than twice
Conductance of intaking or discharge water PH>6.
6th, it is sterilized after soda acid is washed
Bactericidal agent is configured according to table 1；Bactericidal agent is injected to system；Start half of the flow control in desired value（About 40m3/
h）, pay attention to pressure<0.3MPa is recycled 30 minutes.Net bactericidal agent is put, with demineralized water rinse-system 30 minutes.
7th, safety measure
1）Safety device is got out before operation, it is necessary to which Consult drug uses benchmark safely；2）When using any chemicals,
It must comply with the safety operation specification for obtaining accreditation；3）Chemicals needed for cleaning must be dissolved and be mixed well；4）
After cleaning, the flushing of low discharge and low pressure is carried out to system using the clear water without chlorine residue.The cleaning solution meeting in cleaning process
Into production water side, after turning back on, system is run under conditions of running before cleaning, until each pressure vessel production water power connects closely
Value before cleaning, can be by production water incision production supply mains；5）In cleaning process, pay attention to the production unqualified vent valves of water is kept to beat
It opens；6）Cleaning solution and rinse water temperature are no more than 35 in cleaning processoC。
Claims (1)
1. a kind of cleaning method of reverse osmosis membrane system organic pollution is mutually tied including various using sterilization and cleaning changes in flow rate
The cleaning method of the reverse osmosis membrane system organic pollution of conjunction, it is characterised in that：By reverse osmosis membrane system using sterilization-alkali cleaning-
Pickling-sterilization is combined, while ----circulation flushing is combined clear high flow capacity cycle --- immersion --- using low discharge cycle
Mode is washed to complete cleaning process；
The specific steps are：
Flushing before the first step, cleaning：Reverse osmosis membrane system is rinsed until concentrated water discharge mouth conductance is less than twice through water with RO
Water inlet electric conductivity value；
Second step, soda acid wash preceding sterilization；It is recycled in reverse osmosis membrane system 2 hours with 300ppm membrane sterilization agent；
Third step, alkali cleaning：With 0.025% dodecyl sodium sulfate low discharge recycle 30 minutes, then high flow capacity recycle 1 hour, during which
PH value is adjusted 12.7 with NaOH, is finally impregnated 8~24 hours Posterior circles and is rinsed；
4th step, pickling：Recycled 1 hour with 2% or so Citric Acid Mono, it is rear to impregnate 1 hour, after continue cycling through 1 hour, during which
PH value is adjusted between 1~2 with Citric Acid Mono；
5th step, soda acid are sterilized after washing：With the agent of 300ppm membrane sterilizations cleaning process is completed in system circulation within 30 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810006399.2A CN108187501A (en) | 2018-01-04 | 2018-01-04 | A kind of cleaning method of reverse osmosis membrane system organic pollution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810006399.2A CN108187501A (en) | 2018-01-04 | 2018-01-04 | A kind of cleaning method of reverse osmosis membrane system organic pollution |
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| Publication Number | Publication Date |
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| CN108187501A true CN108187501A (en) | 2018-06-22 |
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ID=62587838
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| CN201810006399.2A Pending CN108187501A (en) | 2018-01-04 | 2018-01-04 | A kind of cleaning method of reverse osmosis membrane system organic pollution |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108686519A (en) * | 2018-08-16 | 2018-10-23 | 南京化学工业园热电有限公司 | A kind of back-washing method of ultrafiltration apparatus |
| CN108993162A (en) * | 2018-08-15 | 2018-12-14 | 攀钢集团西昌钢钒有限公司 | A kind of cleaning method of Treatment of Industrial Water reverse osmosis unit |
| CN109126466A (en) * | 2018-09-19 | 2019-01-04 | 山西晋煤天源化工有限公司 | Reverse osmosis on-line cleaning device |
| CN111408275A (en) * | 2020-03-25 | 2020-07-14 | 包头钢铁（集团）有限责任公司 | Reverse osmosis membrane cleaning method |
| CN113069931A (en) * | 2021-05-06 | 2021-07-06 | 镇江沁远电力设备有限公司 | Novel reverse osmosis membrane cleaning process |
| CN114011247A (en) * | 2021-11-18 | 2022-02-08 | 苏州瑞科德能环保科技有限公司 | Method for cleaning and maintaining reclaimed water reuse membrane in PTA (pure terephthalic acid) industry |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108993162A (en) * | 2018-08-15 | 2018-12-14 | 攀钢集团西昌钢钒有限公司 | A kind of cleaning method of Treatment of Industrial Water reverse osmosis unit |
| CN108686519A (en) * | 2018-08-16 | 2018-10-23 | 南京化学工业园热电有限公司 | A kind of back-washing method of ultrafiltration apparatus |
| CN109126466A (en) * | 2018-09-19 | 2019-01-04 | 山西晋煤天源化工有限公司 | Reverse osmosis on-line cleaning device |
| CN111408275A (en) * | 2020-03-25 | 2020-07-14 | 包头钢铁（集团）有限责任公司 | Reverse osmosis membrane cleaning method |
| CN113069931A (en) * | 2021-05-06 | 2021-07-06 | 镇江沁远电力设备有限公司 | Novel reverse osmosis membrane cleaning process |
| CN114011247A (en) * | 2021-11-18 | 2022-02-08 | 苏州瑞科德能环保科技有限公司 | Method for cleaning and maintaining reclaimed water reuse membrane in PTA (pure terephthalic acid) industry |
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Application publication date: 20180622 |