CN109289539A - A kind of brine refining nanofiltration membrane cleaning agent and preparation method thereof - Google Patents
A kind of brine refining nanofiltration membrane cleaning agent and preparation method thereof Download PDFInfo
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- CN109289539A CN109289539A CN201811083229.0A CN201811083229A CN109289539A CN 109289539 A CN109289539 A CN 109289539A CN 201811083229 A CN201811083229 A CN 201811083229A CN 109289539 A CN109289539 A CN 109289539A
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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
- B01D65/06—Membrane cleaning or sterilisation ; Membrane regeneration with special washing compositions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
Abstract
The invention discloses a kind of brine refining nanofiltration membrane cleaning agents and preparation method thereof, are mixed by following component: 1-20 parts of alkaline cleaner；0-5 parts of calgon；0-5 parts of disodium ethylene diamine tetraacetate；2-40 parts of acidic cleaner；0.1-1 parts of surfactant；0.5-5 parts of fungicide；80-200 parts of water.In the reactor with stirring, water is added according to number amount in alkaline cleaner, dispersing agent, chelating agent, surfactant, is stirred evenly；Under room temperature, normal pressure, acidic cleaner, fungicide are sequentially added, stirring and dissolving is uniform, continues to stir 2-4h, stirs period analysis pH value, adjusts pH value between 2-8 using ammonium hydroxide or citric acid.Present invention is generally directed to the nanofiltration membrane pollutions under complicated brine systems with high salt, nanofiltration membrane surface contaminant can effectively be cleaned, not only cleaning effect is more preferably, cleaning agent more saves, it can guarantee that calcium and magnesium rejection is stablized in cleaning process simultaneously, be also applied for the cleaning of concentrated seawater or the higher salt water nanofiltration membrane pollution object of calcic magnesium ion.
Description
Technical field
The present invention relates to water treatment agent fields, and in particular in brine, concentrated seawater or the higher salt water of calcic magnesium ion
Nanofiltration membrane cleaning agent under system.More preferably with cleaning effect, cleaning agent more saves, while can guarantee calcium and magnesium in cleaning process
Rejection is stablized.
Technical background
Brine refining is a kind of for brine, concentrated seawater or the higher body of salt of calcic magnesium ion with nanofiltration membrane cleaning agent
The chemical agent of nanofiltration membrane pollution object application under system, it belongs to mild compound drug, during cleaning nanofiltration membrane, passes through
Reaction, dissolution, dispersion, chelating, infiltration, removing, sterilization, effectively realize nanofiltration membrane pollution object cleaning, while guarantee calcium and magnesium from
The stabilization of sub- rejection.
Chinese patent CN104743582B discloses a kind of method and apparatus that utilization mentions bromine brine production refined brine,
It mainly describes using bromine brine is mentioned by pretreatment, removes most of sulfate radical and calcium and magnesium ion using nanofiltration membrane, obtain
Saturated brine is made in brine dissolution crude salt, and the technique of reproduction soda ash can reduce the purification expense of Sodium Carbonate Plant salt water, to reduce
Production cost.
Lime stone, coke that purification brine can be saved for soda manufacture in salt water removal of impurities are obtained after proposing bromine brine nanofiltration
Charcoal, soda ash consumption reduce the purification expense of salt water.
Proposing bromine brine, purification brine index and rejection, the results are shown in Table 1:
Table 1 proposes bromine brine, purification brine and rejection index
Purification brine in calcium ions and magnesium ions content be directly related to salt water removal of impurities in lime stone, coke, soda ash dosage,
Therefore wherein Mg2+、Ca2+Influence of the variation of rejection to salt refining expense is very big.
Cause proposes bromine brine water quality complexity and fluctuation is larger, and suspended matter increase, microbial growth, calcium ions and magnesium ions and organic matter contain
The problems such as unexpected raising, the incorporation of unknown sources waste water measured, cause the use of nanofiltration membrane greatly to be tested.Especially originally
The effect of nanofiltration membrane is the divalent ions impurity component such as most calcium, magnesium, sulfate radical in removal brine in system, to nanofiltration membrane
Requirement it is also relatively stringent, the SO in nanofiltration membrane use process4 2-Rejection is substantially without decline, and Mg2+、Ca2+Rejection then because
There is different degrees of decline for nanofiltration membrane pollution.
And Mg2+、Ca2+The decline of rejection is applied to the increase shadow of soda manufacture bring purification cost to purification brine
It rings very big.
It needs first to reuse soda ash deliming using calcium oxide (lime stone, coke generate) demagging during salt dissolving.Through surveying
It calculates with Ca2+Rejection is constant, Mg2+Rejection decline 1% calculates, i.e. Mg in purification brine2+Rejection is dropped to by 89.12%
88.12%, then refine Mg in brine2+Content is to rise to 735mg/l by 673mg/l, then during refining brine salt dissolving, purification
Increased costs 10%；
With Mg2+Rejection is constant, Ca2+Rejection decline 1% calculates, i.e. Ca in purification brine2+Rejection is by 65.63%
Drop to 64.63%, then refines Ca in brine2+Content is to rise to 407mg/l by 396mg/l, then during refining brine salt dissolving,
It refines increased costs about 1%；
By calculate above it is found that because nanofiltration membrane pollution or cleaning it is improper caused by nanofiltration membrane Mg2+Rejection decline 1%, then it is smart
Increased costs 10% processed, Ca2+Rejection decline 1%, then refine increased costs 1%, therefore research and develop a kind of guarantee Mg2+、Ca2+It cuts
The nanofiltration membrane cleaning agent for staying rate stable is significant.
Nanofiltration membrane application under brine systems is both different from conventional reverse osmosis membranous system, is also different from common nanofiltration membrane system
System.After nanofiltration membrane runs a period of time under complicated brine systems with high salt, concentrated water side can accumulate colloid, metal oxidation on film
The substances such as object, bacterium, organic matter, scale, cause system rejection decline, water yield reduce, pressure difference increase the problems such as, thus meeting
Form fouling membrane.Nanofiltration membrane pollution is a complicated process, the characteristic of membrane contaminant be physics between water pollutant because
Element, chemical factor, the interaction of microbiological factor three are closely related, they are to be mutually related, not single presence,
When wherein microbial contamination trend is formed, the formation that other two will be accelerated to pollute causes fouling membrane aggravation.So as to cause receiving
The blocking of filter membrane, reduces the filter efficiency and film water yield of film, while improving the cleaning frequency of film, shortens the use of film
Service life increases the number of film replacement, so that the use cost of membrane module and operating cost be made to be significantly increased.
Simultaneously because the comparison of ingredients of brine is complicated, the Pseudomonas in brine is all Halomonas, Halomonas, can be
Salt content is up to growing in 8% culture medium, salt tolerant range 0-32%.It is suitble to PH5-9 growth.Growth temperature: 15-45 DEG C.It is conventional
Fungicide have limitation to the bactericidal effect of microorganism in brine, the increase for sterilizing difficulty also promotes the complexity of pollutant
Degree.
It is dissected by pollution nanofiltration membrane component typical in being run to brine refining, discovery film surface has yellowish-brown pollution
Object is sampled analysis to the pollutant in film surface, and pollutant organic principle accounts for 47.9% as the result is shown for analysis, inorganic constituents
52.1% is accounted for, organic principle is mainly microorganism, and inorganic constituents is mainly sulfate and silicate, therefore nanofiltration membrane pollution is mainly
Microbial contamination and inorganic dirt are stifled.
The diaphragm of dissection membrane component is taken to be tested under high salt conditions, test result shows that diaphragm removal efficiency reduces；It takes
The diaphragm for dissecting membrane component carries out cleaning experiment, and diaphragm uses sodium hydroxide, sodium hydroxide and tetrasodium ethylenediamine tetraacetate clear respectively
Washing rear flux all increased, but rejection is all greatly reduced, and two kinds of cleaning ways all restore diaphragm performance completely.Film
Salt rejection rate declines instead after element cleaning, and possible cause is pollutant in film surface formation filter cake, increases film to a certain extent
Element salt rejection rate, after pollutant is partially removed, salt rejection rate then may decline.
Because of the special divalent ion stalling characteristic of nanofiltration membrane, keep its requirement to cleaning agent more stringent, Duo Shuoqing
Lotion or calcium and magnesium rejection declines to a great extent after cleaning effect is bad or cleaning, therefore select suitable brine refining nanofiltration membrane clear
Wash agent is significant to the chemical cleaning of brine nanofiltration device.
Summary of the invention
The present invention is directed to calcium and magnesium rejection after overcoming under brine systems nanofiltration membrane cleaning effect bad or cleaning substantially under
The difficulty of drop provides a kind of brine refining nanofiltration membrane cleaning agent for the nanofiltration membrane pollution under complicated brine systems with high salt
And preparation method thereof, nanofiltration membrane surface contaminant can be effectively cleaned, not only more preferably, cleaning agent more saves cleaning effect, simultaneously
It can guarantee that the cleaning agent that calcium and magnesium rejection is stable in cleaning process, cleaning agent of the present invention are also applied for concentrated seawater or calcium-magnesium-containing
The cleaning of the higher salt water nanofiltration membrane pollution object of ion.
Brine refining of the invention nanofiltration membrane cleaning agent, is mixed by following component:
Alkaline cleaner: 1-20 parts；
Dispersing agent: calgon, 0-5 parts；
Chelating agent: disodium ethylene diamine tetraacetate, 0-5 parts；
Acidic cleaner: 2-40 parts；
Surfactant: 0.1-1 parts；
Fungicide: 0.5-5 parts；
Water: 80-200 parts；
PH regulator: ammonium hydroxide or citric acid.
Further, alkaline cleaner includes at least sodium tripolyphosphate, tetrasodium ethylenediamine tetraacetate, sodium carbonate, bicarbonate
The one such or several combination of sodium, sodium citrate；
Acidic cleaner include at least citric acid, oxalic acid, sulfamic acid, tartaric acid, malic acid, organic phosphoric acid, salicylic acid,
The one such or several combination of ammonium citrate；
Surfactant includes at least that neopelex, lauryl sodium sulfate be one such or two kinds mixed
Close object；
Fungicide is that isothiazolinone and its derivative or organic bromine class or organic bromine compound one or more of class
Mixture.
Preferred fungicide is that organic bromine class or organic bromine compound class, such as 2,2-Dibromo-3-nitrilopropionamide.
The wash agent pH range is 2-8, wherein preferably 3-6.
Preparation method of the invention, includes the following steps:
(1) in the reactor with stirring, alkaline cleaner of the invention, dispersing agent, chelating agent, surfactant are pressed
Water is added according to number amount, stirs evenly；
(2) under normal pressure, 20-40 DEG C of temperature is controlled, sequentially adds acidic cleaner, fungicide, stirring and dissolving is uniform；
(3) under normal pressure, 20-40 DEG C of temperature stirs 2-4h, stirs period analysis pH value, uses ammonium hydroxide or citric acid tune
PH value is saved between 2-8.
Sodium tripolyphosphate and Ca soluble in water in the present invention2+、Mg2+、Fe3+Equal metal ions have complexing, to albumen
Matter has the effect of swelling solubilization and plays the role of peptization, plays promotion emulsification to fats, has to solids
Disperse the effect to suspend, cleaning solution can be enhanced in cleaning to floatingization of organic matter and sludge, solubilising and dispersion effect.
Tetrasodium ethylenediamine tetraacetate energy and Mg2+、Ca2+、Mn2+、Fe2+The chelating agent that equal bivalent metal ions combine, to sulfuric acid
Calcium salt dirt has preferable chelation cleaning effect, while also there is reaction cleaning to make to silicon, microbial film, organic matter pollutant
With.
Sodium citrate has good water solubility, to the Ca in water2+、Mg2+Equal metal ions have excellent sequestering power, energy
The features such as biodegradable, dispersibility and antiredeposition ability are strong occurs.
Calgon has excellent chelating dispersion performance and higher calcium tolerance, to water as dirt dispersion agent
In Mg2+、Ca2+、Fe2+All have complexing, chelating, absorption peptizaiton, can rise simultaneously in cleaning process cleaning, stabilization and
The effect of dispersion can be improved cleaning effect, and can effectively avoid secondary pollution.
Disodium ethylene diamine tetraacetate is a kind of good compounding agent in chemistry, and there are six coordination atom, the cooperations of formation for it
Object is called chelate, is a kind of important complexing agent, for complexation of metal ions and separation metal.
Citric acid is a kind of important organic acid in the present invention, is used as buffer, complexing agent, metal cleaner etc..Lemon
Acid also has chelation, can remove certain poisonous metals.Builder is made using citric acid or citric acid salt, can improve and wash
Wash the performance of product, can rapid precipitate metal ion, prevent pollutant from adhering to again, make dirt and ash dispersion and suspend, mention
The performance of high surfactant.
Oxalic acid is another kind of metal-chelator in plant derived foods, the complex compound for being dissolved in water can be formed with many metals, together
When there is very strong reproducibility, be easily oxidized to carbon dioxide and water with oxidant effect.
The aqueous solution of sulfamic acid has the highly acid same with hydrochloric acid, sulfuric acid etc., therefore alias is called solid sulphuric acid, it has
There is non-volatile, odorless and minimum to human toxicity.Sulfamic acid can the reaction such as same metal oxide, sulfate, it is raw
At salts such as the very big sulfamic acid iron of dissolubility, calcium, magnesium, while to carbonate, sulfate, phosphate, iron dirt, hydroxide
Etc. dissolving powers it is strong, cleaning effect is good.
Selected fungicide is non oxidizing bactericide in the present invention, isothiazolinone be a kind of wide spectrum, efficiently, low toxicity,
Non oxidizing bactericide, common isothiazolinone biocide agent have: 5- chloro-2-methyl -4- isothiazole -3- ketone, 2- methyl -4-
Isothiazoline -3- ketone, 1,2- benzisothiazole-3-ketone, 2-n- octyl -4- isothiazoline -3- ketone.Isothiazolinone biocide
Agent is a kind of heterocycle structure, and sterilizing mechanisms rely primarily on the DNA molecular that the active part on heterocycle destroys in bacterial cell, make
Bacterium loses activity.After isothiazolinone is contacted with microorganism, the key by disconnecting bacterium and algae protein matter acts work of killing livestock
, promptly can irreversibly inhibit its growth, so as to cause the death of microbial cell, therefore to common bacteria, fungi, algae
Class etc. has very strong inhibition and killing effect.
Organic bromine class or organic bromine compound class non oxidizing bactericide in the present invention, and wherein important component is that 2,2- bis- is bromo-
3- nitrilo- propionamide.As the biocide of broad-spectrum high efficacy, the cell membrane of microorganism can be readily penetrated through, and acts on certain egg
Bai Jituan restores the normal oxidation of cell and stops, so as to cause cell death.Meanwhile its being also an option that property of branch
The specific enzymes metabolin of bromination or oxidizing microorganisms eventually leads to microorganism death.
Preferable killing effect is all had to fungi, bacterium, saccharomycete, algae, biological sludge in industrial and pathogenic microbes,
Sterilization speed is fast simultaneously, high-efficient, and 5-10 minutes sterilizing rates are up to 99% or more.Its rear activity in the fungicide addition system simultaneously
Ingredient rapidly acts on plankton, quick sterilization, simultaneously because the permeability of organic bromine is relatively good, the activity in medicament
Ingredient can quickly penetrate into attachment surface, act on lesser microbiologic population, make its fast depolymerization, prevent biomembrane
Formation.And the biomembrane for having been formed, active constituent do not react with the biological sludge in industrial layer of biofilm surface, and
It is the deeper inside for penetrating into biomembrane rapidly, acts on the microbiologic population of biomembrane intersection, destroys its viscosity, lead to biology
Film falls off.Legionella, sulfate reducing bacteria can also be effectively killed simultaneously.
Organo bromine microbicide can be used as disinfectant, fungicide, algicide, slimes dispersant under complicated brine systems with high salt
Sterilization, stripping performance are more preferably played in agent in cleaning.
In preparation method provided by the invention, because of various medicament number ranges, there is pH value model during the preparation process
Fluctuation is enclosed, needs to analyze pH value at any time during the preparation process, according to pH value situation, adjusts pH value in 2- using ammonium hydroxide or citric acid
Between 8, preferred value 3-6；
The present invention by it is innovative by alkaline cleaner, dispersing agent, chelating agent, acidic cleaner, fungicide is compound matches
5, both remained in a variety of cleaning agents to the complexing of metal ion, chelating, peptizaiton, while can be to plurality of inorganic salt
Dirt and organic deposition, biomembrane etc. play reaction, softening, osmosis, play cleaning restitution.Simultaneously under brine systems
Requirement of the nanofiltration membrane to calcium ions and magnesium ions rejection makes cleaning agent be more conducive to guarantee that nanofiltration membrane is cut by compounding and pH value adjustment
Stay rate.
Brine refining provided by the invention nanofiltration membrane cleaning agent, be it is a kind of for brine, concentrated seawater or calcium-magnesium-containing from
The metal oxides such as inorganic pollutions, iron, the manganese such as calcium carbonate, the calcium sulfate of nanofiltration membrane under the higher brine system of son suspend
The pollution such as solid, microorganism, organic matter realizes cleaning agent and deposit, dirt, corrosion product and influence by compound drug
Other of flux rates and producing water water quality pollutant reaction, rush disengage it from film surface.
Brine refining provided by the invention nanofiltration membrane cleaning agent, belongs to mild compound drug, in cleaning nanofiltration membrane
In the process, by reaction, dissolution, dispersion, chelating, infiltration, removing, sterilization, the cleaning of nanofiltration membrane pollution object is effectively realized, simultaneously
Guarantee the stabilization of calcium ions and magnesium ions rejection.
Specific embodiment
Embodiment 1
(1) in the reactor with stirring, 15 parts of sodium tripolyphosphate are sequentially added, 5 parts of tetrasodium ethylenediamine tetraacetate, six partially
It 5 parts of sodium phosphate, 0.5 part of neopelex, 200 parts of water, stirs evenly；
(2) under normal pressure, 35-40 DEG C of temperature is controlled, sequentially adds 30 parts of citric acid, 5 parts of sulfamic acid, 5 parts of different thiophenes of oxalic acid
5 parts of oxazoline ketone, stirring and dissolving is uniform；
(3) at normal pressure, 35-40 DEG C of temperature, continue to stir, stir period analysis pH value 3-4, cleaning agent is made in stirring 4h
PH value 3.5.
Bromine brine nanofiltration membrane system is proposed using medicament cleaning, effect is as follows:
Embodiment 2
(1) 5 parts of sodium carbonate are sequentially added in the reactor with stirring, 5 parts of sodium citrate, 2 parts of calgon, second
It 3 parts of edetate disodium, 0.3 part of lauryl sodium sulfate, 150 parts of water, stirs evenly；
(2) under normal pressure, 20-25 DEG C of temperature is controlled, sequentially adds 10 parts of citric acid, 5 parts of oxalic acid, 5 parts of tartaric acid, 2,2- bis-
Bromo- 2 parts of 3- nitrilo- propionamide, stirring and dissolving is uniform；
(3) at normal pressure, 20 DEG C of temperature, continue to stir, stir period analysis pH value 4-5, addition ammonium hydroxide adjusts pH value, stirs
It mixes 3h and cleaning agent pH value 6 is made.
Bromine brine nanofiltration membrane system is proposed using medicament cleaning, effect is as follows:
Embodiment 3
(1) 5 parts of sodium citrate are sequentially added in the reactor with stirring, 1 part of calgon, ethylenediamine tetra-acetic acid
It 1 part of disodium, 0.1 part of lauryl sodium sulfate, 80 parts of water, stirs evenly；
(2) under normal pressure, 25-30 DEG C of temperature is controlled, sequentially adds 2 parts of sulfamic acid, 2 parts of ammonium citrate, 1 part of malic acid,
2 parts of 2,2-Dibromo-3-nitrilopropionamide, stirring and dissolving is uniform；
(3) at normal pressure, 25-30 DEG C of temperature, continue to stir, stir period analysis pH value 2-3, addition citric acid adjusts PH
Cleaning agent pH value 2 is made in value, stirring 2h.
Bromine brine nanofiltration membrane system is proposed using medicament cleaning, effect is as follows:
Embodiment 4
(1) 10 parts of sodium tripolyphosphate are sequentially added in the reactor with stirring, 5 parts of sodium bicarbonate, calgon 2
Part, it 2 parts of disodium ethylene diamine tetraacetate, 0.2 part of lauryl sodium sulfate, 100 parts of water, stirs evenly；
(2) under normal pressure, 30-35 DEG C of temperature is controlled, sequentially adds 3 parts of sulfamic acid, 5 parts of organic phosphoric acid, 2 parts of salicylic acid,
5 parts of isothiazolinone, stirring and dissolving is uniform；
(3) at normal pressure, 30-35 DEG C of temperature, continue to stir, stir period analysis pH value 3-4, addition ammonium hydroxide adjusts PH
Cleaning agent pH value 5 is made in value, stirring 2.5h.
Bromine brine nanofiltration membrane system is proposed using medicament cleaning, effect is as follows:
When being cleaned using the above cleaning agent to nanofiltration membrane, not only pressure difference, water yield are restored preferably, while calcium and magnesium retains
Rate is promoted.
Claims (5)
1. a kind of brine refining nanofiltration membrane cleaning agent, which is characterized in that mixed by following component:
Alkaline cleaner: 1-20 parts；
Dispersing agent: calgon, 0-5 parts；
Chelating agent: disodium ethylene diamine tetraacetate, 0-5 parts；
Acidic cleaner: 2-40 parts；
Surfactant: 0.1-1 parts；
Fungicide: 0.5-5 parts；
Water: 80-200 parts；
PH regulator: ammonium hydroxide or citric acid.
2. brine refining according to claim 1 nanofiltration membrane cleaning agent, it is characterised in that:
Alkaline cleaner include at least sodium tripolyphosphate, tetrasodium ethylenediamine tetraacetate, sodium carbonate, sodium bicarbonate, sodium citrate its
One or more of combination；
Acidic cleaner includes at least citric acid, oxalic acid, sulfamic acid, tartaric acid, malic acid, organic phosphoric acid, salicylic acid, lemon
The one such or several combination of sour ammonium；
Surfactant includes at least that neopelex, lauryl sodium sulfate be one such or two kinds of mixing
Object；
Fungicide is the mixing that isothiazolinone and its derivative or organic bromine class or organic bromine compound one or more of class
Object.
3. brine refining according to claim 2 nanofiltration membrane cleaning agent, it is characterised in that: preferred fungicide is organic
Bromine class or organic bromine compound class, such as 2,2-Dibromo-3-nitrilopropionamide.
4. brine refining according to claim 1 nanofiltration membrane cleaning agent, it is characterised in that:
The wash agent pH range is 2-8, wherein preferably 3-6.
5. a kind of brine refining preparation method of nanofiltration membrane cleaning agent, which comprises the steps of:
(1) in the reactor with stirring, by alkaline cleaner of the invention, dispersing agent, chelating agent, surfactant according to part
Water is added in quantity, stirs evenly；
(2) under normal pressure, 20-40 DEG C of temperature is controlled, sequentially adds acidic cleaner, fungicide, stirring and dissolving is uniform；
(3) under normal pressure, 20-40 DEG C of temperature stirs 2-4h, stirs period analysis pH value, adjusts PH using ammonium hydroxide or citric acid
Value is between 2-8.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110102190A (en) * | 2019-04-30 | 2019-08-09 | 中国海洋石油集团有限公司 | Nanofiltration membrane standardized test method and device under a kind of brine systems |
| CN110236170A (en) * | 2019-06-06 | 2019-09-17 | 益盐堂（应城）健康盐制盐有限公司 | A kind of preparation method of edible salt |
| CN110237715A (en) * | 2019-06-27 | 2019-09-17 | 埃姆媞（无锡）分离技术有限公司 | Seperation film filters the membrane flux restoration methods after PCB waste water |
| CN112569656A (en) * | 2020-12-12 | 2021-03-30 | 山东海化集团有限公司 | Method for cleaning cartridge filter element of cartridge filter in brine system |
| CN114130204A (en) * | 2021-12-11 | 2022-03-04 | 青岛沁安化工科技有限公司 | Forward osmosis, reverse osmosis and nanofiltration membrane anti-attenuation medicament and preparation method thereof |
| CN114854499A (en) * | 2022-05-12 | 2022-08-05 | 山东天庆科技发展有限公司 | Efficient cleaning agent for double-membrane method and preparation method thereof |
| CN115155323A (en) * | 2022-07-22 | 2022-10-11 | 青岛沁安化工科技有限公司 | Reverse osmosis and forward osmosis membrane repairing agent and preparation method thereof |
| EP3920979A4 (en) * | 2019-02-06 | 2022-10-26 | Virox Technologies Inc. | Shelf-stable antimicrobial compositions |
| CN115448432A (en) * | 2022-11-11 | 2022-12-09 | 山东海化集团有限公司 | Sterilization and decontamination agent in brine system and preparation method thereof |
| US11738310B2 (en) | 2019-12-31 | 2023-08-29 | Industrial Technology Research Institute | Method for cleaning membrane |
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