CN109224870A - A kind of nanofiltration, reverse osmosis membrane chemical cleaning method - Google Patents
A kind of nanofiltration, reverse osmosis membrane chemical cleaning method Download PDFInfo
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- CN109224870A CN109224870A CN201811379027.0A CN201811379027A CN109224870A CN 109224870 A CN109224870 A CN 109224870A CN 201811379027 A CN201811379027 A CN 201811379027A CN 109224870 A CN109224870 A CN 109224870A
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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
- B01D2321/162—Use of acids
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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
The invention discloses a kind of nanofiltration, the chemical cleaning method of reverse osmosis membrane, the chemical cleaning method is the following steps are included: (1) carries out pickling to nanofiltration membrane or reverse osmosis membrane using acid solution；(2) it is cleaned after carrying out pickling to nanofiltration or reverse osmosis membrane using product water；(3) alkali cleaning is carried out to nanofiltration or reverse osmosis membrane using alkaline cleaning fluid；(4) it is cleaned after carrying out alkali cleaning to nanofiltration or reverse osmosis membrane using product water, completes the cleaning to nanofiltration, reverse osmosis membrane.Chemical cleaning method of the present invention, each pollutant on nanofiltration/reverse osmosis membrane can efficiently be removed, reduce nanofiltration/reverse osmosis membrane operating pressure, improve nanofiltration/reverse osmosis membrane clear liquid yield, extend nanofiltration/reverse osmosis membrane service life, reduces clear liquid power consumption, and can guarantee the stable operation of Refuse Leachate Treatment Plant, have many advantages, such as that simple process, easy to operate, cleaning is low in cost, cleaning efficiency is high, cleaning effect is good, there is good application value and application prospect.
Description
Technical field
The invention belongs to technical field of landfill leachate treatment, it is related to the chemical cleaning method of a kind of nanofiltration, reverse osmosis membrane.
Background technique
In new refuse percolate, B/C high, total hardness are high, need successively to use MBR, ultrafiltration, nanofiltration, reverse osmosis treatment,
It is wherein usually to be handled using nanofiltration/reverse osmosis membrane (NF/RO film) ultra-filtration water during nanofiltration, reverse osmosis treatment.
However, the pollutant of NF/RO film surface also accumulates more and more with the continuous service of NF/RO film, the film property shown
Energy feature is that the clear liquid yield of the film stillness of night declines, and operating pressure increases, and effluent quality is deteriorated.Therefore, in nanofiltration/reverse osmosis membrane
It must periodically be cleaned in operational process, so as to keep the operating pressure of design and produce water yield.
The cleaning method of existing NF/RO film is divided into physical cleaning and chemical cleaning two major classes, wherein due to the production of NF/RO film
Aquaporin is blocked by all kinds of surface contaminants, thus can not reach the production for restoring NF/RO film completely only with physical cleaning
Water yield and operating pressure.Generally as the circulating pressure rise 20-30% of NF/RO film or production water yield decline 3-5%, it is necessary into
Row chemical cleaning.The Chinese patent literature of Publication No. CN105561794A discloses a kind of suitable for ultrafiltration membrane or reverse osmosis membrane
Cleaning method, using " one section is individually washed ", " one or two sections of series connection are washed, and two sections are individually washed " cleaning way clean reverse osmosis membrane,
Wherein mix cleaning solution are as follows: alkaline cleaner 2-3%, acidic cleaner 2-3%, fungicide 0.5%, remaining is water.The cleaning method
Be disadvantageous in that: alkaline cleaner ingredient used is excessively complicated, causes to clean at high cost, and contains in the alkaline cleaner
Organosilicon, it is impossible to be used in cleaning nanofiltration/reverse osmosis membrane, this is because silicon-containing material enters after membrane component the damage that will cause film,
And then influence the service life and filter effect of film；Do not consider in the cleaning method simultaneously cleaning temperature in cleaning process, pH,
Influence of the soaking time to reverse osmosis membrane materials, and these factors are easily caused to the irreversible damage of nanofiltration/reverse osmosis membrane, meeting
It is serious to reduce nanofiltration/reverse osmosis membrane service life and filter effect.The Chinese patent literature of Publication No. CN105195024A
The cleaning method of a kind of nanofiltration, reverse osmosis membrane is disclosed, acidic cleaner cleaning is first carried out, it is rear to carry out alkaline cleaner cleaning.
The deficiency of this method be in: acidic cleaner mesoxalic acid/acidity of hydrochloric acid used is extremely strong, for cleaning nanofiltration/reverse osmosis membrane, meeting
Shorten film service life, influences effluent index, and the chloride ion in hydrochloric acid can clean stainless steel in nanofiltration/reverse osmosis membrane unit
Pump and circulating pump have burn into breakdown effects；Oxalic acid is toxic, and to operator's skin, mucous membrane is irritating and corrosiveness, easily passes through
Epidermis, mucosa absorption cause to be poisoned, thus the medicament is not suitable for being used for a long time from safety considerations；Likewise, the cleaning side
Do not consider that cleaning temperature, soaking time are to the influence of nanofiltration/reverse osmosis membrane in cleaning process in method yet.In addition, due to rubbish
The package form of distinctive each pollutant and its pollutant, causes NF/RO film surface by the tight of various pollutions in percolate
Heavily contaminated, thus the selection of NF/RO Membrane cleaning liquid is particularly important, this directly affects the removal effect of NF/RO film surface pollutant.
However, existing chemical cleaning medicament is generally suitable type cleaning agent, specific aim is not strong, is difficult to effectively remove NF/RO film surface
Pollutant is not able to satisfy the cleaning requirement of NF/RO film, and the chemical cleaning method of existing NF/RO film is relatively single, clear
It washes in sequence and cleaning parameters control to exist and ignore, when NF/RO film for cleaning treatment landfill leachate, often cleaning effect
It is bad.In addition, nanofiltration, reverse osmosis membrane materials be polyamide material, acid and alkali resistance is not strong, under certain cleaning temperature, can with it is strong
Alkali, oxidizing substance chemically react, thus nanofiltration/reverse osmosis membrane is to cleaning solvent, cleaning temperature, pH and soaking time etc.
Factor is very sensitive, if state modulator is improper in the ingredient of cleaning solution or cleaning process, is being easy to produce after being cleaned multiple times
Membrane damage causes its outlet effect to be deteriorated.Therefore, how to improve the above-mentioned problems in the prior art comprehensively, to obtain one
Kind simple process, the nanofiltration that easy to operate, cleaning is low in cost, cleaning efficiency is high, cleaning effect is good, the chemistry of reverse osmosis membrane are clear
Washing method has a very important significance the treatment effeciency and treatment effect that improve landfill leachate.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, provide a kind of simple process, it is easy to operate,
Clean the chemical cleaning method of low in cost, cleaning efficiency is high, cleaning effect is good nanofiltration, reverse osmosis membrane.
In order to solve the above technical problems, the invention adopts the following technical scheme:
A kind of nanofiltration, reverse osmosis membrane chemical cleaning method, comprising the following steps:
(1) pickling: acidic cleaning solution is passed into nanofiltration membrane or the membrane tube of reverse osmosis membrane, opens circulation, to nanofiltration membrane or instead
Permeable membrane carries out pickling, when the temperature of liquid to be cleaned reaches 38 DEG C~39 DEG C, stops circulation, impregnates nanofiltration membrane or reverse osmosis membrane
In cleaning solution, when the temperature of liquid to be cleaned is down to 34 DEG C~36 DEG C, opens circulation and continue pickling；In the acid cleaning process
The pH value for controlling cleaning solution is 2~3；
(2) it is cleaned after pickling: after the pickling in step (1), nanofiltration or reverse osmosis membrane being rinsed using product water, gone
Except remaining cleaning solution；
(3) after cleaning after the pickling in step (2), alkaline cleaning fluid alkali cleaning: is passed into nanofiltration membrane or reverse osmosis membrane
In membrane tube, circulation is opened, alkali cleaning is carried out to nanofiltration membrane or reverse osmosis membrane and is stopped when the temperature of liquid to be cleaned reaches 38 DEG C~39 DEG C
It only recycles, is immersed in nanofiltration membrane or reverse osmosis membrane in cleaning solution, when the temperature of liquid to be cleaned is down to 34 DEG C~36 DEG C, unlatching is followed
Ring continues alkali cleaning；The pH value that cleaning solution is controlled in the alkaline cleaning procedure is 10.5~11；
(4) it is cleaned after alkali cleaning: after the alkali cleaning in step (2), nanofiltration or reverse osmosis membrane being rinsed using product water, gone
Except remaining cleaning solution, the cleaning to nanofiltration or reverse osmosis membrane is completed.
Above-mentioned chemical cleaning method, further improved, in the step (1), the dosage of the acidic cleaning solution is
Every membrane tube uses acidic cleaning solution 13L~34L.
Above-mentioned chemical cleaning method, further improved, in the step (1), the pickling liquid presses mass parts
Meter includes following components: 2~3 parts of organic acids, 1~1.5 part of EDTA, 1~1.5 part of non oxidizing bactericide and 94~96 parts of products
Water；The pH value of the acidic cleaning solution is 2~3.
Above-mentioned chemical cleaning method, further improved, the organic acid is citric acid；The non oxidizing bactericide
For DBNPA fungicide.
Above-mentioned chemical cleaning method, it is further improved, in the step (1), lemon is used in the acid cleaning process
Acid adjusts the pH of cleaning solution；The time of the immersion is 0.5h~2h；The duration of the acid cleaning process is 4h~6h.
Above-mentioned chemical cleaning method, further improved, in the step (3), the dosage of the alkaline cleaning fluid is
Every membrane tube uses alkaline cleaning fluid 13L~34L.
Above-mentioned chemical cleaning method, further improved, in the step (3), the alkali cleaning cleaning solution presses mass parts
Meter includes following components: 2~3 parts of alkali, 0.05~0.1 part of surfactant and 97~98 parts of product waters；The alkaline cleaning fluid
PH value be 10.5~11.
Above-mentioned chemical cleaning method, further improved, the alkali is sodium hydroxide and/or potassium hydroxide；The table
Face activating agent is neopelex.
Above-mentioned chemical cleaning method, it is further improved, in the step (3), alkali soluble is used in the alkaline cleaning procedure
The pH of liquid adjusting cleaning solution；The lye is sodium hydroxide solution；The mass concentration of the sodium hydroxide solution is 30%~45%；
The time of the immersion≤30min；The duration of the alkaline cleaning procedure is 2h~3h.
Above-mentioned chemical cleaning method, it is further improved, it further include to receiving before carrying out pickling in the step (1)
Filter membrane or reverse osmosis membrane clean before carrying out pickling；It is cleaned before the pickling are as follows: product water is passed into nanofiltration membrane or reverse osmosis membrane
Membrane tube in, open circulation, cleaned before carrying out pickling to nanofiltration membrane or reverse osmosis membrane；It is cleaned before carrying out pickling to the nanofiltration membrane
When, the circular flow for controlling nanofiltration membrane is 22m3/ h~25m3/h；When to cleaning before reverse osmosis membrane progress pickling, control is anti-
The circular flow of permeable membrane is 10m3/ h~15m3/h；The time cleaned before the pickling is 10min~20min.
Relational language in the present invention is explained:
Product water: reverse osmosis membrane system water outlet.
MBR: membrane bioreactor is divided into biochemical treatment and Ultra filtration membrane processing two systems.For membrane separation technique with
Biologic treating technique organically combines, biochemical system domestic demand culture activated sludge, after landfill leachate enters the biochemical system of MBR,
Ultrafiltration system is entered back into, mud-water separation is carried out.
PLC: programmable logic controller (PLC) allows nanofiltration/reverse osmosis operations that automation is presented.
Nanofiltration/reverse osmosis membrane produces water flow: the small molecule that ultrafiltration produces specified molecular weight in aqueous mixtures can pass through nanofiltration/anti-
Filter opening in osmos tube, and be able to collect the total amount of clear liquid.
Nanofiltration/reverse osmosis membrane produces water yield: nanofiltration/reverse osmosis membrane produces water flow and nanofiltration/reverse osmosis membrane flow of inlet water
Ratio.
The operating pressure of NF/RO film: for separating driving force provided by special pore size distribution pollutant supercharging equipment.
Compared with the prior art, the advantages of the present invention are as follows:
(1) not strong for the acid and alkali resistance of NF/RO film, it is easy to chemically react with highly basic, oxidizing substance, causes membrane damage
The problems such as, while being inorganic scale calcium carbonate, magnesium carbonate, iron-containing metal oxide based on the major pollutants of NF/RO film surface
And organic matter, the colloid of specified molecular weight, the present invention provides a kind of nanofiltrations, the chemical cleaning method of reverse osmosis membrane, acid
Cleaning solution and alkaline cleaning fluid successively carry out pickling and alkali cleaning to nanofiltration membrane or reverse osmosis membrane, being capable of high-efficiency washing removal nanofiltration membrane
With each pollutant on reverse osmosis membrane surface, the production water yield and operating pressure of nanofiltration membrane and reverse osmosis membrane improve rapidly, so that
The properties of nanofiltration membrane and reverse osmosis membrane restore to design value, and the cleaning method will not influence nanofiltration membrane and reverse osmosis membrane sheet
The property of body is conducive to the service life for improving nanofiltration membrane and reverse osmosis membrane, so as to guarantee nanofiltration/reverse osmosis membrane system
Stable operation greatly improves the clear liquid processing capacity of Refuse Leachate Treatment Plant.(such as acidic cleaning solution is with existing cleaning method
Hydrochloric acid solution) it compares, nanofiltration membrane and the service life of reverse osmosis membrane can be improved half after cleaning method of the present invention cleaning
Year or more, i.e., nanofiltration membrane and the service life of reverse osmosis membrane at least shorten half a year after existing cleaning method cleaning, while through this hair
The clear liquid processing capacity of Refuse Leachate Treatment Plant at least can be improved 1% after the cleaning of Ming and Qing washing method, i.e., every 100 tons of processing super
Water is filtered out, it can 1 ton of clear liquid of more outlets.Meanwhile not going out when being cleaned using cleaning method of the present invention to nanofiltration/reverse osmosis membrane
The phenomenon that existing nanofiltration/reverse osmosis membrane unit equipment is corroded and punctures.Nanofiltration of the present invention, reverse osmosis membrane chemical cleaning method,
Can efficiently remove each pollutant on nanofiltration/reverse osmosis membrane, reduce nanofiltration/reverse osmosis membrane operating pressure, improve nanofiltration/
The clear liquid yield of reverse osmosis membrane extends nanofiltration/reverse osmosis membrane service life, reduces clear liquid power consumption, and can guarantee that rubbish seeps
The stable operation of filtrate treatment plant, with simple process, easy to operate, cleaning is low in cost, cleaning efficiency is high, cleaning effect is good
The advantages that, there is good application value and application prospect.
(2) inventor is it is also found that: in nanofiltration/reverse osmosis membrane cleaning process during practical study, nanofiltration/reverse osmosis
Film is very sensitive to factors such as cleaning solvent, cleaning temperature, pH and soaking times, if joining in the ingredient of cleaning solution or cleaning process
Number control is improper, and membrane damage is being easy to produce after being cleaned multiple times, its outlet effect is caused to be deteriorated.For these problems, originally
The formula of acidic cleaning solution and alkalinity cleaning, either acidic cleaning solution or alkaline cleaning fluid are optimized in invention, they
Ingredient is relatively simple, this advantageously reduces the cost of material of cleaning, and chloride ion and Strong oxdiative are not contained in these cleaning solutions
Substance will not have any impact to the stainless steel equipment of the reverse osmosis unit of Na Lv, ensure that unit equipment and Na Lv reverse osmosis
The service life of permeable membrane, while there is no toxic and corrosive elements in these cleaning solutions, will not have to operator's skin, mucous membrane
Stimulation and corrosiveness, safety is high, is suitable for being used for a long time.In addition, being added in pickling medicament in acid cleaning process
EDTA and non-oxidative antimicrobial, play booster action, to remove metal oxide and biocolloid, raising nanofiltration/reverse osmosis
Film permeant flux.On this basis, it is also optimized in the present invention and is easy to cause bad shadow to nanofiltration/reverse osmosis membrane in cleaning process
Loud each factor, as controlled the temperature in cleaning process be 38 DEG C~39 DEG C, the pH value of acidic cleaning solution is 2~3, alkalinity is clear
The pH value of washing lotion is 10.5~11, through the temperature and pH value of cleaning solution in optimization cleaning process, in guaranteeing cleaning process
Cleaning effect is further increased under the premise of not will cause membrane damage, this is because cleaning effect can be improved by improving cleaning temperature,
But be unfavorable for reducing the damage to film, although and damage to film can be reduced by reducing cleaning temperature, cleaning effect is also therewith
It reduces；Likewise, in cleaning process cleaning solution peracid or cross alkali film can be caused to damage, worse cleaning temperature compared with
In the case where height, if cleaning solution peracid or excessively alkali, easily cause not recoverable substantive damage.At the same time, in the present invention
Also optimize the time of immersion, wherein in acid cleaning process soaking time be 0.5h~2h, soaking time≤0.5h in alkaline cleaning procedure,
It can reduce the reaction speed of cleaning solution and pollutant by optimizing soaking time, the promotion pair while reducing cleaning solution temperature
The infiltration of deeper time pollutant, to further increase cleaning effect, and the soaking time range cleaning liquid inside of optimization not
Film can be caused to damage.As it can be seen that the present invention to the greatest extent may be used by the cooperation control of cleaning formula of liquid and cleaning process parameter in the hope of reaching
The damage to film can be reduced and improved to nanofiltration/reverse osmosis membrane cleaning effect, thus restoring nanofiltration/reverse osmosis membrane property
Can, under the premise of the service life for extending film, significantly improve nanofiltration/reverse osmosis membrane cleaning effect.
(3) in the method for the present invention, nanofiltration, reverse osmosis membrane is cleaned using product water, making for cleaning solution can be reduced
Dosage at the same time, is cleaned before and after pickling, alkali cleaning using product water to reduce cleaning cost, can also be further
Influence of the pickling liquid to alkaline cleaning fluid cleaning effect is reduced, so that the method for the present invention is with stable and preferable clear
Wash effect.
Detailed description of the invention
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, the technical scheme in the embodiment of the invention is clearly and completely described.
Fig. 1 be the embodiment of the present invention in nanofiltration, reverse osmosis membrane chemical cleaning method process flow chart.
Specific embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
It limits the scope of the invention.
Material employed in following embodiment and instrument are commercially available.
Embodiment 1:
In the present embodiment, mature landfill leachate waste water is after fresh leachate deploys C/N ratio, into MBR biochemical treatment, then into
Enter ultrafiltration system, realize mud-water separation, ultrafiltration produces water and then stored with water tank.Using nanofiltration/reverse osmosis membrane to ultrafiltration produce water into
Row advanced treating reaches the discharge standard of GB16889-2008 table two.
In the present embodiment, when the conductivity that ultrafiltration produces water is 14000-15000us/cm, total hardness 4000-6000mg/
L, COD 400-500mg/L when water temperature is 32-36 DEG C, produce water using nanofiltration/reverse osmosis membrane processing ultrafiltration.Nanofiltration/reverse osmosis
Membrane material is polyamide, is Tao Shi film, reverse osmosis model SW30HRLE-370/34i, nanofiltration membrane model NF270-400.Nanofiltration membrane
Assembly operating pressure is 5-6.5bar, and clear liquid yield is 85%；Reverse osmosis membrane tube operating pressure is 24-27bar, and clear liquid yield is
75%；Nanofiltration/reverse osmosis unit membrane component is 32, and nanofiltration membrane flow of inlet water is 30m3/ h, it is 25.5m that clear liquid, which produces water flow,3/
H, reverse osmosis membrane flow of inlet water are 20m3/ h, it is 15m that clear liquid, which produces water flow,3/h.After retention, separation ultrafiltration produce water for a period of time,
Nanofiltration membrane operating pressure rises to 7-8bar, and flow of inlet water is unchanged, and clear liquid flow is reduced to 23-24 m3/ h, reverse osmosis membrane operation
Pressure goes up to 30bar, and flow of inlet water is unchanged, and clear liquid flow is down to 14 m3/ h, nanofiltration/reverse osmosis membrane has generated sternly at this time
The pollution of weight, need to enter chemical cleaning procedure.
In the present embodiment, thermometer is installed in purge tank, and is connected to sensor program, temperature to be cleaned is more than setting
After value, nanofiltration/reverse osmosis membrane unit can be automatically stopped；And the water inlet of nanofiltration/reverse osmosis membrane, production water end (W.E.) are mounted on Electromagnetic Flow
It counts, each section of pressure gauge is installed on pipeline, the variation of nanofiltration/reverse osmosis membrane clear liquid yield and pressure amount of increase can be can be visually seen.
In the present embodiment, the pollutant of nanofiltration film surface is mainly that inorganic scale calcium carbonate, magnesium carbonate, certain molecular weight are organic
Pollutant, colloidal metal oxide, microorganism etc., inorganic scale and metal oxide are easily chemically reacted with acid, and organic matter,
Colloid is easily chemically reacted with alkali；No matter pickling or alkali cleaning, with chemically reacting with pollutant, sour cleaning solution pH will
Rise, alkaline cleaner pH decline, therefore needs constantly to adjust pH in cleaning process.
A kind of chemical cleaning method of nanofiltration membrane, process flow chart are as shown in Figure 1, comprising the following steps:
(1) it is cleaned before pickling: product water (as reverse osmosis membrane water outlet) is injected into purge tank.Using flushing pump by purge tank
Interior product water is driven into the membrane tube of nanofiltration membrane, is opened circulating pump, is recycled product water in the membrane tube of nanofiltration membrane, to nanofiltration
Film cleans before carrying out pickling, and scavenging period control is 23.6m in 20min, the circular flow of nanofiltration membrane3/h.After cleaning, put
Product water in empty purge tank, and according to the color of purge tank discharge water, it is determined whether it needs to carry out the clear water cleaning of product water again,
Until the water and product water color no significant difference that discharge in purge tank, can terminate (this process can save cleaning agent).
(2) pickling: after cleaning before pickling in step (1), the product water in purge tank is emptied.According to acidic cleaning solution
Dosage be that every membrane tube uses acidic cleaning solution 34L, acidic cleaning solution is injected into purge tank.It will be cleaned using flushing pump
Acidic cleaning solution in tank is driven into the membrane tube (size of the membrane tube is 8 cun) of nanofiltration membrane, is opened circulating pump, is made acidity
Cleaning solution recycles in the membrane tube of nanofiltration membrane, carries out pickling to nanofiltration membrane, when the temperature of liquid to be cleaned reaches 39 DEG C, stops following
Ring is immersed in nanofiltration membrane in cleaning solution, soaking time 30min, when the temperature of liquid to be cleaned is down to 36 DEG C, open circulation after
Continuous to carry out pickling, the pH value that cleaning solution is wherein controlled in acid cleaning process is 2~3.
In the step (2), for the cleaning effect for ensureing pollutant in acid cleaning process, strict control is answered to clean in cleaning process
The pH value of liquid is 2-3, this is because the pH value of cleaning solution has variation by a relatively large margin in cleaning process, thus to cleaning effect
Be affected.Therefore, should according to the actual situation every 5-10 minutes pH measurement, such as not up to setting value are carried out to cleaning solution, need
Add the pH to setting value (2-3) that citric acid adjusts cleaning solution, and the addition manner of citric acid is using by the way of " a small amount of multiple ",
Avoid membrane damage.The duration of acid cleaning process is 6h, and the judgment criteria that pickling terminates is emerged or clearly with non-foam in purge tank
Subject to washing lotion is relatively clear.
In the step (2), acidic cleaning solution used includes following components in parts by mass: 3 parts of organic acids (citric acid),
1.5 parts of EDTA, 1.5 parts of non oxidizing bactericides (DBNPA fungicide, 2,2- bis- bromo -3- nitrilo--propionamides) and 94 parts of productions
Product water, and the pH value of acidic cleaning solution is 2~3.The pH value of the acidic cleaning solution can be used citric acid and be adjusted.
(3) it is cleaned after pickling: after the pickling in step (2), emptying the cleaning solution in purge tank.First rushed with product water
Cleaning of evaporator is washed down product water is injected into purge tank after tank cleaning to be cleaned.Using flushing pump by the product in purge tank
Water is driven into the membrane tube of nanofiltration membrane, is rinsed to nanofiltration membrane, and removal remains in the cleaning solution of nanofiltration membrane.In cleaning process,
The constantly supplementary water into purge tank terminates punching as pH of the pH of mixed liquor in the membrane tube of nanofiltration membrane close to product water
It washes.
(4) alkali cleaning: after cleaning after the pickling in step (3), the product water in purge tank is emptied.It is cleaned according to alkalinity
The dosage of liquid is that every membrane tube uses alkaline cleaning fluid 26L, and alkaline cleaning fluid is injected into purge tank.Using flushing pump by alkali
Property cleaning solution be passed into the membrane tube (size of the membrane tube be 8 cun) of nanofiltration membrane, open circulating pump, alkaline cleaning fluid made to exist
Circulation in the membrane tube of nanofiltration membrane carries out alkali cleaning to nanofiltration membrane, when the temperature of liquid to be cleaned reaches 39 DEG C, stops circulation, makes nanofiltration
Film is immersed in cleaning solution, soaking time 30min, when the temperature of liquid to be cleaned is down to 36 DEG C, is opened circulation and is continued alkali
It washes；The pH value that cleaning solution is controlled in alkaline cleaning procedure is 10.5~11.
In the step (4), to ensure the cleaning effect of pollutant in alkaline cleaning procedure and avoiding membrane damage, alkali cleaning
The pH value that strict control cleaning solution is answered in journey is 10.5-11, this is the change that cleaning solution pH value has by a relatively large margin in cleaning process
Change, large effect can be caused to cleaning effect and film, thus in cleaning process should according to the actual situation every 5-10 minutes to clear
Washing lotion carries out pH measurement, such as not up to setting value, and the liquid alkaline that need to add mass concentration 40% adjusts the pH of cleaning solution to setting value
(10.5-11).Since cleaning process can cause to damage to NF/RO membrane material, thus the alkali cleaning time is unsuitable too long, in the present embodiment
The duration of alkaline cleaning procedure is 3h, not only contributes to improve cleaning effect, while can also avoid cleaning the damage to film.
In the step (4), alkali cleaning cleaning solution used includes following components in parts by mass: 2 parts of sodium hydroxides, and 0.1 part
Neopelex and 97.9 parts of product waters, and the pH value of alkaline cleaning fluid is 10.5~11.The pH of the alkaline cleaning fluid
Value can be adjusted by the sodium hydroxide solution that mass concentration is 30%~45%.
(5) it is cleaned after alkali cleaning: after the alkali cleaning in step (4), emptying the cleaning solution in purge tank.First rushed with product water
Cleaning of evaporator is washed down product water is injected into purge tank after tank to be cleaned cleans up.Using flushing pump by the product in purge tank
Water is driven into the membrane tube of nanofiltration membrane, is rinsed to nanofiltration membrane, and removal remains in the cleaning solution of nanofiltration membrane.In cleaning process,
The constantly supplementary water into purge tank terminates to rinse, complete as pH of the pH of the mixed liquor in membrane tube close to product water
Cleaning to nanofiltration membrane.
After the cleaning method cleaning in above-mentioned the present embodiment, nanofiltration membrane, which continues on for generating ultrafiltration, carries out depth
Reason, wherein nanofiltration membrane operating pressure drops to 5.6bar, and clear liquid flow rises to 25.5m3/h -26m3/ h, this illustrates nanofiltration membrane table
The inorganic scale (calcium carbonate, magnesium carbonate) of face attachment and organic deposition is substantially all is removed, nanofiltration membrane production water yield restore to
Design value, cleaning effect is fine, and the production water flow of nanofiltration membrane goes up obvious.
Embodiment 2:
In the present embodiment, mature landfill leachate waste water is after fresh leachate deploys C/N ratio, into MBR biochemical treatment, then into
Enter ultrafiltration system, realize mud-water separation, ultrafiltration produces water and then stored with water tank.Using nanofiltration/reverse osmosis membrane to ultrafiltration produce water into
Row advanced treating reaches the discharge standard of GB16889-2008 table two.
In the present embodiment, when the conductivity that ultrafiltration produces water is 14000-15000us/cm, total hardness 4000-6000mg/
L, COD 400-500mg/L when water temperature is 32-36 DEG C, produce water using nanofiltration/reverse osmosis membrane processing ultrafiltration.Nanofiltration/reverse osmosis
Membrane material is polyamide, is Tao Shi film, reverse osmosis model SW30HRLE-370/34i, nanofiltration membrane model NF270-400.Nanofiltration membrane
Assembly operating pressure is 5-6.5bar, and clear liquid yield is 85%；Reverse osmosis membrane tube operating pressure is 24-27bar, and clear liquid yield is
75%；Nanofiltration/reverse osmosis unit membrane component is 32, nanofiltration membrane flow of inlet water 30m3/ h, it is 25.5m that clear liquid, which produces water flow,3/ h,
Reverse osmosis membrane flow of inlet water is 20m3/ h, it is 15m that clear liquid, which produces water flow nanofiltration,3/h.Water is produced for a period of time in retention, separation ultrafiltration
Afterwards, nanofiltration membrane operating pressure rises to 7-8bar, and flow of inlet water is unchanged, and clear liquid flow is reduced to 23-24 m3/ h, reverse osmosis membrane
Operating pressure goes up to 30bar, and flow of inlet water is unchanged, and clear liquid flow is down to 14 m3/ h, nanofiltration/reverse osmosis membrane has produced at this time
Raw serious pollution, need to enter chemical cleaning procedure.
In the present embodiment, thermometer is installed in purge tank, and is connected to sensor program, temperature to be cleaned is more than setting
After value, nanofiltration/reverse osmosis membrane unit can be automatically stopped；And the water inlet of nanofiltration/reverse osmosis membrane, production water end (W.E.) are mounted on Electromagnetic Flow
It counts, each section of pressure gauge is installed on pipeline, the variation of nanofiltration/reverse osmosis membrane clear liquid yield and pressure amount of increase can be can be visually seen.
In the present embodiment, the pollutant on reverse osmosis membrane surface is mainly that inorganic scale calcium carbonate, magnesium carbonate, certain molecular weight have
Machine pollutant, colloid, microorganism, metal oxide, inorganic scale and metal oxide are easily chemically reacted with acid, and organic
Object, colloid are easily chemically reacted with alkali；No matter pickling or alkali cleaning, with being chemically reacted with pollutant, sour cleaning solution
PH will rise, alkaline cleaner pH decline, therefore need constantly to adjust pH in cleaning process.
A kind of chemical cleaning method of reverse osmosis membrane, process flow chart are as shown in Figure 1, comprising the following steps:
(1) it is cleaned before pickling: product water (as reverse osmosis membrane water outlet) is injected into purge tank.Using flushing pump by purge tank
Interior product water is driven into the membrane tube of reverse osmosis membrane, is opened circulating pump, is recycled product water in the membrane tube of reverse osmosis membrane, right
Reverse osmosis membrane cleans before carrying out pickling, and scavenging period control is 10.5m in 20min, the circular flow of reverse osmosis membrane3/h.Cleaning
After, the product water being vented in purge tank, and according to the color of purge tank discharge water, it is determined whether it needs to carry out product water again
Clear water cleaning, until the water and product water color no significant difference that discharge in purge tank, can terminate that (this process can save clearly
Wash agent).
(2) pickling: after cleaning before pickling in step (1), the product water in purge tank is emptied.According to acidic cleaning solution
Dosage be that every membrane tube uses acidic cleaning solution 34L, acidic cleaning solution is injected into purge tank.It will be cleaned using flushing pump
Acidic cleaning solution in tank is driven into the membrane tube (size of the membrane tube is 8 cun) of reverse osmosis membrane, is opened circulating pump, is made acid
Property cleaning solution recycled in the membrane tube of reverse osmosis membrane, to reverse osmosis membrane carry out pickling, when the temperature of liquid to be cleaned reaches 39 DEG C, stop
It only recycles, is immersed in reverse osmosis membrane in cleaning solution, soaking time 30min when the temperature of liquid to be cleaned is down to 36 DEG C, is opened
Circulation continues pickling, and the pH value that cleaning solution is wherein controlled in acid cleaning process is 2~3.
In the step (2), for the cleaning effect for ensureing pollutant in acid cleaning process, strict control is answered to clean in cleaning process
The pH value of liquid is 2-3, this is because the pH value of cleaning solution has variation by a relatively large margin in cleaning process, thus to cleaning effect
Be affected.Therefore, should according to the actual situation every 5-10 minutes pH measurement, such as not up to setting value are carried out to cleaning solution, need
Add the pH to setting value (2-3) that citric acid adjusts cleaning solution, and the addition manner of citric acid is using by the way of " a small amount of multiple ",
Avoid membrane damage.The duration of acid cleaning process is 6h, and the judgment criteria that pickling terminates is emerged or clearly with non-foam in purge tank
Subject to washing lotion is relatively clear.
In the step (2), acidic cleaning solution used includes following components in parts by mass: 3 parts of organic acids (citric acid),
1.5 parts of EDTA, 1.5 parts of non oxidizing bactericides (DBNPA fungicide) and 94 parts of product waters, and the pH value of acidic cleaning solution is 2
~3.The pH value of the acidic cleaning solution can be used citric acid and be adjusted.
(3) it is cleaned after pickling: after the pickling in step (2), emptying the cleaning solution in purge tank.First rushed with product water
Cleaning of evaporator is washed down product water is injected into purge tank after tank cleaning to be cleaned.Using flushing pump by the product in purge tank
Water is driven into the membrane tube of reverse osmosis membrane, is rinsed to reverse osmosis membrane, and removal remains in the cleaning solution of reverse osmosis membrane.It cleaned
Cheng Zhong, constantly the supplementary water into purge tank terminates to rinse as pH of the pH of mixed liquor in membrane tube close to product water.
(4) alkali cleaning: after cleaning after the pickling in step (3), the product water in purge tank is emptied.It is cleaned according to alkalinity
The dosage of liquid is that every membrane tube uses alkaline cleaning fluid 26L, and alkaline cleaning fluid is injected into purge tank.Using flushing pump by alkali
Property cleaning solution be passed into the membrane tube (size of the membrane tube be 8 cun) of reverse osmosis membrane, open circulating pump, make alkaline cleaning fluid
It is recycled in the membrane tube of reverse osmosis membrane, alkali cleaning is carried out to reverse osmosis membrane, when the temperature of liquid to be cleaned reaches 39 DEG C, stop circulation,
Be immersed in reverse osmosis membrane in cleaning solution, soaking time 30min, when the temperature of liquid to be cleaned is down to 36 DEG C, open circulation after
It is continuous to carry out alkali cleaning；The pH value that cleaning solution is controlled in alkaline cleaning procedure is 10.5~11.
In the step (4), to ensure the cleaning effect of pollutant in alkaline cleaning procedure and avoiding membrane damage, alkali cleaning
The pH value that strict control cleaning solution is answered in journey is 10.5-11, this is the change that cleaning solution pH value has by a relatively large margin in cleaning process
Change, large effect can be caused to cleaning effect and film, thus in cleaning process should according to the actual situation every 5-10 minutes to clear
Washing lotion carries out pH measurement, such as not up to setting value, and the liquid alkaline that need to add mass concentration 40% adjusts the pH of cleaning solution to setting value
(10.5-11).Since cleaning process can cause to damage to NF/RO membrane material, thus the alkali cleaning time is unsuitable too long, in the present embodiment
The duration of alkaline cleaning procedure is 3h, not only contributes to improve cleaning effect, while can also avoid cleaning the damage to film.
In the step (4), alkali cleaning cleaning solution used includes following components in parts by mass: 2 parts of sodium hydroxides, and 0.1 part
Neopelex and 97.9 parts of product waters, and the pH value of alkaline cleaning fluid is 10.5~11.The pH of the alkaline cleaning fluid
Value can be adjusted by the sodium hydroxide solution that mass concentration is 40%.
(5) it is cleaned after alkali cleaning: after the alkali cleaning in step (4), emptying the cleaning solution in purge tank.First rushed with product water
Cleaning of evaporator is washed down product water is injected into purge tank after tank to be cleaned cleans up.Using flushing pump by the product in purge tank
Water is driven into the membrane tube of reverse osmosis membrane, is rinsed to reverse osmosis membrane, and removal remains in the cleaning solution of reverse osmosis membrane.It cleaned
Cheng Zhong, constantly the supplementary water into purge tank terminates punching as pH of the pH of the mixed liquor in membrane tube close to product water
It washes, completes the cleaning to reverse osmosis membrane.
After the cleaning method cleaning in above-mentioned the present embodiment, reverse osmosis membrane, which continues on for generating ultrafiltration, carries out depth
Reason, wherein reverse osmosis membrane operating pressure drops to 24bar-25bar, and clear liquid flow rises to 15 m3/h-15.5m3/ h, this explanation are anti-
The inorganic scale (calcium carbonate, magnesium carbonate) of infiltration film surface attachment and organic deposition is substantially all is removed, reverse osmosis membrane production water
Yield is restored to design value, and cleaning effect is fine, and the production water flow of reverse osmosis membrane goes up obvious.
In summary, nanofiltration of the present invention, reverse osmosis membrane chemical cleaning method, using the acidic cleaning solution specially developed and
Alkaline cleaning fluid successively carries out pickling and alkali cleaning to nanofiltration membrane or reverse osmosis membrane, being capable of high-efficiency washing removal nanofiltration membrane and reverse osmosis
The production water yield and operating pressure of each pollutant of film surface, nanofiltration membrane and reverse osmosis membrane improve rapidly so that nanofiltration membrane and
The properties of reverse osmosis membrane restore to design value, and the cleaning method will not influence the property of nanofiltration membrane and reverse osmosis membrane itself
Matter is conducive to the service life for improving nanofiltration membrane and reverse osmosis membrane, so as to guarantee that nanofiltration/reverse osmosis membrane system stablizes fortune
Row, greatly improves the operation processing capacity of Refuse Leachate Treatment Plant.(such as acidic cleaning solution is that hydrochloric acid is molten with existing cleaning method
Liquid) it compares, nanofiltration membrane and the service life of reverse osmosis membrane can be improved half a year or more after cleaning method of the present invention cleaning,
Nanofiltration membrane and the service life of reverse osmosis membrane at least shorten half a year after i.e. existing cleaning method cleaning, while through cleaning side of the invention
The clear liquid processing capacity of Refuse Leachate Treatment Plant at least can be improved 1% after method cleaning, i.e. 100 tons of ultra-filtration waters of every processing, can
1 ton of clear liquid of more outlets.Meanwhile not occurring nanofiltration/anti-when cleaning using cleaning method of the present invention to nanofiltration/reverse osmosis membrane
The phenomenon that permeable membrane unit equipment is corroded and punctures.Nanofiltration of the present invention, reverse osmosis membrane chemical cleaning method, can efficiently go
Except each pollutant on nanofiltration/reverse osmosis membrane, nanofiltration/reverse osmosis membrane operating pressure is reduced, improves nanofiltration/reverse osmosis membrane
Clear liquid yield extends nanofiltration/reverse osmosis membrane service life, reduces clear liquid power consumption, and can guarantee Refuse Leachate Treatment Plant
Stable operation, have many advantages, such as that simple process, easy to operate, cleaning is low in cost, cleaning efficiency is high, cleaning effect is good, have
There are good application value and application prospect.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention is disclosed as above with preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, in the case where not departing from Spirit Essence of the invention and technical solution, all using in the methods and techniques of the disclosure above
Appearance makes many possible changes and modifications or equivalent example modified to equivalent change to technical solution of the present invention.Therefore,
Anything that does not depart from the technical scheme of the invention are made to the above embodiment any simple according to the technical essence of the invention
Modification, equivalent replacement, equivalence changes and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (10)
1. the chemical cleaning method of a kind of nanofiltration, reverse osmosis membrane, which comprises the following steps:
(1) pickling: acidic cleaning solution is passed into nanofiltration membrane or the membrane tube of reverse osmosis membrane, opens circulation, to nanofiltration membrane or instead
Permeable membrane carries out pickling, when the temperature of liquid to be cleaned reaches 38 DEG C~39 DEG C, stops circulation, impregnates nanofiltration membrane or reverse osmosis membrane
In cleaning solution, when the temperature of liquid to be cleaned is down to 34 DEG C~36 DEG C, opens circulation and continue pickling；In the acid cleaning process
The pH value for controlling cleaning solution is 2~3；
(2) it is cleaned after pickling: after the pickling in step (1), nanofiltration or reverse osmosis membrane being rinsed using product water, gone
Except remaining cleaning solution；
(3) after cleaning after the pickling in step (2), alkaline cleaning fluid alkali cleaning: is passed into nanofiltration membrane or reverse osmosis membrane
In membrane tube, circulation is opened, alkali cleaning is carried out to nanofiltration membrane or reverse osmosis membrane and is stopped when the temperature of liquid to be cleaned reaches 38 DEG C~39 DEG C
It only recycles, is immersed in nanofiltration membrane or reverse osmosis membrane in cleaning solution, when the temperature of liquid to be cleaned is down to 34 DEG C~36 DEG C, unlatching is followed
Ring continues alkali cleaning；The pH value that cleaning solution is controlled in the alkaline cleaning procedure is 10.5~11；
(4) it is cleaned after alkali cleaning: after the alkali cleaning in step (2), nanofiltration or reverse osmosis membrane being rinsed using product water, gone
Except remaining cleaning solution, the cleaning to nanofiltration or reverse osmosis membrane is completed.
2. chemical cleaning method according to claim 1, which is characterized in that in the step (1), the acidic cleaning solution
Dosage be that every membrane tube uses acidic cleaning solution 13L~34L.
3. chemical cleaning method according to claim 2, which is characterized in that in the step (1), the pickling liquid
It in parts by mass include following components: 2~3 parts of organic acids, 1~1.5 part of EDTA, 1~1.5 part of non oxidizing bactericide and 94~
96 parts of product waters；The pH value of the acidic cleaning solution is 2~3.
4. chemical cleaning method according to claim 3, which is characterized in that the organic acid is citric acid；It is described non-oxygen
The property changed fungicide is DBNPA fungicide.
5. chemical cleaning method according to claim 1, which is characterized in that in the step (1), in the acid cleaning process
The pH of cleaning solution is adjusted using citric acid；The time of the immersion is 0.5h~2h；The duration of the acid cleaning process is 4h
~6h.
6. chemical cleaning method according to any one of claims 1 to 5, which is characterized in that in the step (3), institute
The dosage for stating alkaline cleaning fluid is that every membrane tube uses alkaline cleaning fluid 13L~34L.
7. chemical cleaning method according to claim 6, which is characterized in that in the step (3), the alkali cleaning cleaning solution
It in parts by mass include following components: 2~3 parts of alkali, 0.05~0.1 part of surfactant and 97~98 parts of product waters；The alkali
Property cleaning solution pH value be 10.5~11.
8. chemical cleaning method according to claim 7, which is characterized in that the alkali is sodium hydroxide and/or hydroxide
Potassium；The surfactant is neopelex.
9. chemical cleaning method according to claim 6, which is characterized in that in the step (3), in the alkaline cleaning procedure
The pH of cleaning solution is adjusted using aqueous slkali；The lye is sodium hydroxide solution；The mass concentration of the sodium hydroxide solution is
30%~45%；The time of the immersion≤30min；The duration of the alkaline cleaning procedure is 2h~3h.
10. chemical cleaning method according to any one of claims 1 to 5, which is characterized in that in the step (1),
It further include being cleaned before carrying out pickling to nanofiltration membrane or reverse osmosis membrane before progress pickling；It is cleaned before the pickling are as follows: lead to product water
Enter into nanofiltration membrane or the membrane tube of reverse osmosis membrane, open circulation, is cleaned before carrying out pickling to nanofiltration membrane or reverse osmosis membrane；To described
When cleaning before nanofiltration membrane progress pickling, the circular flow for controlling nanofiltration membrane is 22m3/ h~25m3/h；The reverse osmosis membrane is carried out
When cleaning before pickling, the circular flow for controlling reverse osmosis membrane is 10m3/ h~15m3/h；The time cleaned before the pickling is
10min~20min.
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Cited By (13)
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| CN109954406A (en) * | 2019-05-13 | 2019-07-02 | 成都工业学院 | A kind of reverse osmosis membrane cleaning process |
| CN110252149A (en) * | 2019-06-26 | 2019-09-20 | 南京丰信环境技术有限公司 | A kind of off-line cleaning method being heavily polluted reverse osmosis membrane |
| CN110898675A (en) * | 2019-12-09 | 2020-03-24 | 吉林省电力科学研究院有限公司 | Calcium sulfate scale cleaning agent for reverse osmosis membrane and cleaning method |
| CN111533333A (en) * | 2020-05-09 | 2020-08-14 | 江苏澳特克环境科技有限公司 | Purification treatment method of cleaning waste liquid |
| CN111559815A (en) * | 2020-05-09 | 2020-08-21 | 江苏澳特克环境科技有限公司 | Treatment process for cleaning waste liquid |
| CN112337313A (en) * | 2020-11-16 | 2021-02-09 | 中芯膜(北京)科技有限公司 | Reverse osmosis membrane element online cleaning method based on combined pollution |
| CN112933993A (en) * | 2021-04-06 | 2021-06-11 | 碧水源膜技术研究中心(北京)有限公司 | Method for cleaning nanofiltration membrane |
| CN112999882A (en) * | 2021-04-16 | 2021-06-22 | 厦门市天泉鑫膜科技股份有限公司 | High-efficiency acidic cleaning agent for landfill leachate pollutants and application thereof |
| 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 |
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| 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 |
| CN114288865A (en) * | 2021-12-31 | 2022-04-08 | 河南同生环境工程有限公司 | Offline air vibration cleaning method for reverse osmosis membrane |
| CN115105961A (en) * | 2021-03-22 | 2022-09-27 | 国家能源投资集团有限责任公司 | Nanofiltration regeneration method of waste reverse osmosis membrane element |
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| CN109954406A (en) * | 2019-05-13 | 2019-07-02 | 成都工业学院 | A kind of reverse osmosis membrane cleaning process |
| CN110252149A (en) * | 2019-06-26 | 2019-09-20 | 南京丰信环境技术有限公司 | A kind of off-line cleaning method being heavily polluted reverse osmosis membrane |
| CN110898675A (en) * | 2019-12-09 | 2020-03-24 | 吉林省电力科学研究院有限公司 | Calcium sulfate scale cleaning agent for reverse osmosis membrane and cleaning method |
| CN111533333A (en) * | 2020-05-09 | 2020-08-14 | 江苏澳特克环境科技有限公司 | Purification treatment method of cleaning waste liquid |
| CN111559815A (en) * | 2020-05-09 | 2020-08-21 | 江苏澳特克环境科技有限公司 | Treatment process for cleaning waste liquid |
| CN112337313A (en) * | 2020-11-16 | 2021-02-09 | 中芯膜(北京)科技有限公司 | Reverse osmosis membrane element online cleaning method based on combined pollution |
| CN112337313B (en) * | 2020-11-16 | 2021-11-09 | 中芯膜(北京)科技有限公司 | Reverse osmosis membrane element online cleaning method based on combined pollution |
| CN115105961A (en) * | 2021-03-22 | 2022-09-27 | 国家能源投资集团有限责任公司 | Nanofiltration regeneration method of waste reverse osmosis membrane element |
| CN115105961B (en) * | 2021-03-22 | 2023-12-26 | 国家能源投资集团有限责任公司 | Nanofiltration regeneration method of waste reverse osmosis membrane element |
| CN112933993A (en) * | 2021-04-06 | 2021-06-11 | 碧水源膜技术研究中心(北京)有限公司 | Method for cleaning nanofiltration membrane |
| CN112999882A (en) * | 2021-04-16 | 2021-06-22 | 厦门市天泉鑫膜科技股份有限公司 | High-efficiency acidic cleaning agent for landfill leachate pollutants and application thereof |
| 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 |
| CN113813793A (en) * | 2021-10-25 | 2021-12-21 | 湖南沁森高科新材料有限公司 | Cleaning method of reverse osmosis membrane system |
| CN113813793B (en) * | 2021-10-25 | 2024-05-10 | 湖南沁森高科新材料有限公司 | Cleaning method of reverse osmosis membrane system |
| 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 |
| CN114288865A (en) * | 2021-12-31 | 2022-04-08 | 河南同生环境工程有限公司 | Offline air vibration cleaning method for reverse osmosis membrane |
| CN114288865B (en) * | 2021-12-31 | 2022-09-20 | 河南同生环境工程有限公司 | Offline air vibration cleaning method for reverse osmosis membrane |
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