CN109289539B - Nanofiltration membrane cleaning agent for brine refining and preparation method thereof - Google Patents
Nanofiltration membrane cleaning agent for brine refining and preparation method thereof Download PDFInfo
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- CN109289539B CN109289539B CN201811083229.0A CN201811083229A CN109289539B CN 109289539 B CN109289539 B CN 109289539B CN 201811083229 A CN201811083229 A CN 201811083229A CN 109289539 B CN109289539 B CN 109289539B
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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 nanofiltration membrane cleaning agent for brine refining and a preparation method thereof, wherein the nanofiltration membrane cleaning agent is prepared by mixing the following components: 1-20 parts of alkaline cleaning agent; 0-5 parts of sodium hexametaphosphate; 0-5 parts of disodium ethylene diamine tetraacetate; 2-40 parts of an acidic cleaning agent; 0.1-1 part of surfactant; 0.5-5 parts of a bactericide; 80-200 parts of water. Adding an alkaline cleaning agent, a dispersing agent, a chelating agent and a surfactant into water according to parts in a reactor with stirring, and uniformly stirring; sequentially adding an acidic cleaning agent and a bactericide at normal temperature and normal pressure, stirring and dissolving uniformly, continuously stirring for 2-4h, analyzing the pH value during stirring, and adjusting the pH value to be 2-8 by using ammonia water or citric acid. The method is mainly used for cleaning the pollutants on the surface of the nanofiltration membrane under a high-salt complex brine system, can effectively clean the pollutants on the surface of the nanofiltration membrane, has better cleaning effect and more saved cleaning agent, can ensure stable calcium and magnesium interception rate in the cleaning process, and is also suitable for cleaning the pollutants on the nanofiltration membrane in concentrated seawater or brine with higher calcium and magnesium ions.
Description
Technical Field
The invention relates to the field of water treatment agents, in particular to a nanofiltration membrane cleaning agent under brine, concentrated seawater or a saline water system with high calcium and magnesium ions. The cleaning effect is better, the cleaning agent is more saved, and the calcium and magnesium retention rate in the cleaning process can be ensured to be stable.
Technical Field
The nanofiltration membrane cleaning agent for brine refining is a chemical agent applied to nanofiltration membrane pollutants in brine, concentrated seawater or a saline water system with high calcium and magnesium ions, belongs to a mild compound agent, and effectively realizes the cleaning of the nanofiltration membrane pollutants through reaction, dissolution, dispersion, chelation, permeation, stripping and sterilization in the nanofiltration membrane cleaning process, and simultaneously ensures the stability of the calcium and magnesium ion rejection rate.
Chinese patent CN104743582B discloses a method and apparatus for producing refined brine by using bromine extraction brine, which mainly introduces a process of pre-treating the bromine extraction brine, removing most of sulfate radicals, calcium and magnesium ions by using a nanofiltration membrane, dissolving crude salt in the obtained brine to prepare saturated brine, and reproducing soda ash, which can reduce the refining cost of brine in soda ash plants, thereby reducing the production cost.
The refined brine obtained after the nanofiltration of the bromine extraction brine is used for the soda production, so that the consumption of limestone, coke and soda in the brine impurity removal can be saved, and the refining cost of the brine is reduced.
The indexes and retention rate results of the bromine extraction brine and the refined brine are shown in table 1:
TABLE 1 bromine extraction brine, refined brine and rejection index
The content of calcium and magnesium ions in the refined brine is directly related to the dosage of limestone, coke and soda ash in the brine impurity removal process, so that the Mg content in the brine2+、Ca2+The change in rejection rate has a great impact on the brine purification cost.
The use of the nanofiltration membrane is greatly tested due to the problems of complex water quality and large fluctuation of the bromine extraction brine, the increase of suspended matters, the growth of microorganisms, the sudden increase of the contents of calcium, magnesium ions and organic matters, the doping of unknown source wastewater and the like. Especially, the nanofiltration membrane in the system has the functions of removing most of divalent ion impurity components such as calcium, magnesium, sulfate radical and the like in brine, has strict requirements on the nanofiltration membrane, and has SO in the use process of the nanofiltration membrane4 2-The rejection rate is not reduced basically, and Mg2+、Ca2+The rejection rate is reduced to different degrees due to the pollution of the nanofiltration membrane.
And Mg2+、Ca2+Decrease in retention rate vs. spermThe refining cost caused by applying the brine preparation to the soda production has great influence.
In the process of salt melting, calcium oxide (generated by limestone and coke) is firstly used for removing magnesium, and then soda ash is used for removing calcium. Measured by Ca2+Constant retention rate, Mg2+The retention rate is reduced by 1 percent, namely Mg in the refined brine2+The retention rate is reduced from 89.12 percent to 88.12 percent, and then Mg in the refined brine is obtained2+The content is from 673mg/l to 735mg/l, the refining cost is increased by 10 percent in the process of refining the brine into salt;
with Mg2+Constant retention rate, Ca2+The retention rate is reduced by 1 percent, namely Ca in the refined brine2+The retention rate is reduced from 65.63% to 64.63%, and Ca in the refined brine is reduced2+The content is increased from 396mg/l to 407mg/l, so that the refining cost is increased by about 1 percent in the process of refining the brine into salt;
from the above calculation, it can be known that the nanofiltration membrane Mg is caused by the contamination or improper cleaning of the nanofiltration membrane2+When the rejection rate is reduced by 1%, the refining cost is increased by 10%, and Ca is added2+The rejection rate is reduced by 1%, and the refining cost is increased by 1%, so that a method for ensuring Mg is developed2+、Ca2+The nanofiltration membrane cleaning agent with stable rejection rate has great significance.
The application of the nanofiltration membrane under the brine system is different from the traditional reverse osmosis membrane system and is also different from the common nanofiltration membrane system. After the nanofiltration membrane is operated for a period of time in a complex high-salinity brine system, substances such as colloids, metal oxides, bacteria, organic matters, water scales and the like can be accumulated on the concentrated water side of the membrane, so that the problems of reduction of the rejection rate of the system, reduction of the water yield, increase of the pressure difference and the like are caused, and membrane pollution is formed. The nanofiltration membrane pollution is a complex process, the characteristics of the membrane pollutants are closely related to the interaction among physical factors, chemical factors and microbial factors of the pollutants in water, the physical factors, the chemical factors and the microbial factors are related to each other and do not exist singly, and when the microbial pollution trend is formed, the formation of the other two kinds of pollution is necessarily accelerated, so that the membrane pollution is aggravated. Thereby causing the blockage of the nanofiltration membrane, reducing the filtration efficiency and the water yield of the membrane, simultaneously improving the cleaning frequency of the membrane, shortening the service life of the membrane, and increasing the times of membrane replacement, thereby greatly increasing the use cost and the operation cost of the membrane component.
Meanwhile, due to the complex components of the brine, the genera in the brine are Halomonas and Halomonas, and can grow in a culture medium with the salt content of 8 percent, and the salt tolerance range is 0-32 percent. Suitable for growth at pH 5-9. Growth temperature: 15-45 ℃. The conventional bactericide has limitation on the sterilization effect of microorganisms in brine, and the increase of sterilization difficulty also promotes the complexity of pollutants.
The typical polluted nanofiltration membrane element in brine refining operation is dissected, so that a tawny pollutant is found on the surface of the membrane, the pollutant on the surface of the membrane is sampled and analyzed, and the analysis result shows that the organic component of the pollutant accounts for 47.9 percent, the inorganic component of the pollutant accounts for 52.1 percent, the organic component of the pollutant is mainly microorganism, the inorganic component of the pollutant is mainly sulfate and silicate, and therefore the pollution of the nanofiltration membrane is mainly microbial pollution and inorganic pollution blockage.
Testing the membrane of the anatomical membrane element under a high-salt condition, wherein the test result shows that the removal rate of the membrane is reduced; the membrane of the dissecting membrane element is taken for cleaning experiments, the flux of the membrane is increased after the membrane is cleaned by sodium hydroxide, sodium hydroxide and ethylene diamine tetraacetic acid tetrasodium, but the retention rate is greatly reduced, and the performance of the membrane is not completely recovered by the two cleaning modes. The rejection rate of the membrane elements after cleaning is rather reduced, which may be due to the contaminants forming a filter cake on the membrane surface, increasing the rejection rate of the membrane elements to some extent, and when the contaminants are partially removed, the rejection rate may be reduced.
Due to the special divalent ion separation characteristic of the nanofiltration membrane, the requirement on cleaning agents is stricter, most cleaning agents have poor cleaning effect or the calcium and magnesium rejection rate after cleaning is greatly reduced, and therefore, the selection of the proper nanofiltration membrane cleaning agent for brine refining has great significance for chemical cleaning of a brine nanofiltration device.
Disclosure of Invention
The invention aims to overcome the difficulty that the cleaning effect of a nanofiltration membrane under a brine system is poor or the rejection rate of calcium and magnesium after cleaning is greatly reduced, and provides a nanofiltration membrane cleaning agent for brine refining and a preparation method thereof, aiming at the nanofiltration membrane pollution under a high-salt complex brine system.
The nanofiltration membrane cleaning agent for brine refining is prepared by mixing the following components:
alkaline cleaning agent: 1-20 parts;
0-5 parts of dispersing agent sodium hexametaphosphate;
chelating agent disodium ethylene diamine tetraacetate, 0-5 parts;
acid cleaning agent: 2-40 parts;
surfactant (b): 0.1-1 part;
and (3) bactericide: 0.5-5 parts;
water: 80-200 parts of a binder;
pH regulators: ammonia or citric acid.
Further, the alkaline cleaning agent at least comprises one or the combination of more of sodium tripolyphosphate, ethylene diamine tetraacetic acid tetrasodium, sodium carbonate, sodium bicarbonate and sodium citrate;
the acidic cleaning agent at least comprises one or a combination of more of citric acid, oxalic acid, sulfamic acid, tartaric acid, malic acid, organic phosphoric acid, salicylic acid and ammonium citrate;
the surfactant at least comprises one or a mixture of two of sodium dodecyl benzene sulfonate and sodium dodecyl sulfate;
the bactericide is one or a mixture of more of isothiazolinone and derivatives thereof, organic bromine or organic bromine complex.
The bactericide is preferably organic bromine or organic bromine complex, such as 2, 2-dibromo-3-nitrilopropionamide.
The pH value of the lotion is in the range of 2-8, preferably 3-6.
The preparation method comprises the following steps:
(1) adding the alkaline cleaning agent, the dispersing agent, the chelating agent and the surfactant into water according to parts in a reactor with stirring, and uniformly stirring;
(2) under normal pressure, controlling the temperature to be 20-40 ℃, sequentially adding the acidic cleaning agent and the bactericide, and uniformly stirring and dissolving;
(3) stirring at 20-40 deg.C under normal pressure for 2-4 hr, analyzing pH during stirring, and adjusting pH to 2-8 with ammonia water or citric acid.
The sodium tripolyphosphate and Ca dissolved in water in the invention2+、Mg2+、Fe3+The metal ions have a complexing effect, have a swelling and solubilizing effect on proteins to achieve a peptizing effect, have an emulsification promoting effect on fats, have a dispersion and suspension effect on solid particles, and can enhance the floating, solubilizing and dispersing effects of the cleaning solution on organic matters and sludge in cleaning.
Ethylenediaminetetraacetic acid Tetrasodium salt with Mg2+、Ca2+、Mn2+、Fe2+The chelating agent combined with the divalent metal ions has a good chelating and cleaning effect on calcium sulfate salt scale, and also has a reaction and cleaning effect on silicon, microbial membranes and organic pollutants.
The sodium citrate has good water solubility and can be used for treating Ca in water2+、Mg2+The metal ions have the characteristics of excellent chelating capacity, biodegradability, strong dispersing capacity and anti-redeposition capacity and the like.
Sodium hexametaphosphate is used as a scale inhibition and dispersion agent, has excellent chelating and dispersion performance and higher calcium tolerance, and can resist Mg in water2+、Ca2+、Fe2+All have the functions of complexing, chelating and adsorbing dispersion, can play the roles of cleaning, stabilizing and dispersing simultaneously in the cleaning process, can improve the cleaning effect, and can effectively avoid secondary pollution.
Disodium ethylenediaminetetraacetate is a good chemical complexing agent, has six coordination atoms, forms a complex called chelate, and is an important complexing agent for complexing metal ions and separating metals.
Citric acid is an important organic acid in the present invention and is used as a buffering agent, a complexing agent, a metal cleaning agent, etc. Citric acid also has a chelating effect, and can scavenge some harmful metals. The use of citric acid or citrate as builder improves the performance of the detergent product, allows for rapid precipitation of metal ions, prevents reattachment of contaminants, disperses and suspends dirt and ash, and improves the performance of the surfactant.
Oxalic acid is another metal chelating agent in plant food, can form a complex dissolved in water with a plurality of metals, has strong reducibility, and is easily oxidized into carbon dioxide and water by the action of an oxidant.
The water solution of sulfamic acid has strong acidity equal to that of hydrochloric acid, sulfuric acid, etc., so it is also called solid sulfuric acid, and it has the features of no volatilization, no bad smell and very low toxicity to human body. The sulfamic acid can react with metal oxide, sulfate, etc. to produce ferric sulfamate, calcium, magnesium, etc. with high solubility, and has high dissolving power to carbonate, sulfate, phosphate, iron scale, hydroxide, etc. and high cleaning effect.
The bactericide selected in the invention is a non-oxidizing bactericide, isothiazolinone is a broad-spectrum, high-efficiency, low-toxicity, non-oxidizing bactericide, and common isothiazolinone bactericides comprise: 5-chloro-2-methyl-4-isothiazol-3-one, 2-methyl-4-isothiazolin-3-one, 1, 2-benzisothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one. The isothiazolinone germicide is one kind of heterocyclic structure and has the germicidal principle of destroying DNA molecule inside bacterial cell with the active part in the heterocyclic structure to make the bacteria inactive. After the isothiazolinone contacts with the microorganism, the isothiazolinone has a biocidal effect by breaking the bonds of proteins of the bacteria and the algae, can quickly and irreversibly inhibit the growth of the microorganism, so that the microorganism cells die, and has strong inhibiting and killing effects on common bacteria, fungi, algae and the like.
The organic bromine or organic bromine compound non-oxidative bactericide of the invention comprises 2, 2-dibromo-3-nitrilopropionamide as an important component. As a broad-spectrum efficient biocide, the product can rapidly penetrate the cell membrane of microorganism and act on certain protein groups to stop the normal oxidation and reduction of cells, thereby causing cell death. At the same time, its branches can also selectively brominate or oxidize specific enzyme metabolites of the microorganism, eventually leading to the death of the microorganism.
The bactericidal composition has good killing effect on fungi, bacteria, yeasts, algae, biological slime and pathogenic microorganisms, and has the advantages of high sterilization speed and high efficiency, and the sterilization rate reaches more than 99 percent in 5-10 minutes. Meanwhile, after the bactericide is added into a system, the active ingredients of the bactericide rapidly act on planktonic microorganisms to rapidly sterilize, and meanwhile, because the permeability of organic bromine is good, the active ingredients in the bactericide can rapidly permeate to the surface of attachments to act on a small microbial community, so that the bactericide is rapidly depolymerized, and the formation of a biological membrane is prevented. In the formed biological membrane, the active ingredients do not react with the biological slime layer on the surface of the biological membrane, but quickly permeate into the deeper part of the biological membrane to act on the microbial community at the boundary of the biological membrane, destroy the viscosity of the biological membrane and cause the falling-off of the biological membrane. Meanwhile, legionella and sulfate reducing bacteria can be effectively killed.
The organic bromine bactericide can be used as a disinfectant, a bactericide, an algicide and a slime remover in a high-salt complex brine system, and has better sterilization and stripping performances in cleaning.
In the preparation method provided by the invention, due to the change of the range of the parts of various medicaments, the pH value range fluctuation exists in the preparation process, the pH value needs to be analyzed at any time in the preparation process, and ammonia water or citric acid is used for adjusting the pH value to be between 2 and 8, preferably 3 to 6 according to the pH value condition;
the invention maintains the complexing, chelating and dispersing functions of various cleaning agents on metal ions by innovatively compounding and matching the alkaline cleaning agent, the dispersing agent, the chelating agent, the acidic cleaning agent and the bactericide, and can play a role in reacting, softening and permeating various inorganic salt scales, organic scales, biological membranes and the like, thereby playing a role in cleaning and recovering. Meanwhile, aiming at the requirement of the nanofiltration membrane on the rejection rate of calcium and magnesium ions in a brine system, the cleaning agent is more beneficial to ensuring the rejection rate of the nanofiltration membrane through compounding and pH value adjustment.
The invention provides a nanofiltration membrane cleaning agent for brine refining, which aims at the pollution of inorganic pollutants such as calcium carbonate and calcium sulfate, metal oxides such as iron and manganese, suspended solids, microorganisms and organic matters of a nanofiltration membrane under brine, concentrated seawater or a saline water system with higher calcium and magnesium ions, and realizes the reaction of the cleaning agent with sediments, dirt, corrosion products and other pollutants influencing flux rate and water quality through a compound agent so as to promote the cleaning agent to be separated from the surface of the membrane.
The nanofiltration membrane cleaning agent for brine refining provided by the invention belongs to a mild compound agent, and can effectively clean pollutants of the nanofiltration membrane by reaction, dissolution, dispersion, chelation, permeation, stripping and sterilization in the nanofiltration membrane cleaning process, and simultaneously ensure the stability of calcium and magnesium ion rejection rate.
Detailed Description
Example 1
(1) Adding 15 parts of sodium tripolyphosphate, 5 parts of ethylene diamine tetraacetic acid tetrasodium, 5 parts of sodium hexametaphosphate, 0.5 part of sodium dodecyl benzene sulfonate and 200 parts of water in a reactor with stirring in sequence, and uniformly stirring;
(2) under normal pressure, controlling the temperature to be 35-40 ℃, sequentially adding 30 parts of citric acid, 5 parts of sulfamic acid and 5 parts of oxalic acid and 5 parts of isothiazolinone, and uniformly stirring and dissolving;
(3) stirring at 35-40 deg.C under normal pressure, analyzing pH value for 3-4 during stirring, and stirring for 4 hr to obtain cleaning agent pH value of 3.5.
The medicament is applied to cleaning a nanofiltration membrane system for extracting bromine brine, and has the following effects:
example 2
(1) Sequentially adding 5 parts of sodium carbonate, 5 parts of sodium citrate, 2 parts of sodium hexametaphosphate, 3 parts of disodium ethylene diamine tetraacetate, 0.3 part of sodium dodecyl sulfate and 150 parts of water into a reactor with stirring, and uniformly stirring;
(2) under normal pressure, controlling the temperature to be 20-25 ℃, sequentially adding 10 parts of citric acid, 5 parts of oxalic acid, 5 parts of tartaric acid and 2 parts of 2, 2-dibromo-3-nitrilopropionamide, and uniformly stirring and dissolving;
(3) and (2) continuously stirring at the temperature of 20 ℃ under normal pressure, analyzing the pH value to be 4-5 during stirring, adding ammonia water to adjust the pH value, and stirring for 3 hours to obtain the pH value of 6 of the cleaning agent.
The medicament is applied to cleaning a nanofiltration membrane system for extracting bromine brine, and has the following effects:
example 3
(1) Sequentially adding 5 parts of sodium citrate, 1 part of sodium hexametaphosphate, 1 part of disodium ethylene diamine tetraacetate, 0.1 part of sodium dodecyl sulfate and 80 parts of water into a reactor with a stirrer, and uniformly stirring;
(2) under normal pressure, controlling the temperature to be 25-30 ℃, sequentially adding 2 parts of sulfamic acid, 2 parts of ammonium citrate, 1 part of malic acid and 2 parts of 2, 2-dibromo-3-nitrilopropionamide, and stirring and dissolving uniformly;
(3) continuously stirring at 25-30 deg.C under normal pressure, analyzing pH value of 2-3 during stirring, adding citric acid to adjust pH value, and stirring for 2 hr to obtain cleaning agent pH value of 2.
The medicament is applied to cleaning a nanofiltration membrane system for extracting bromine brine, and has the following effects:
example 4
(1) Sequentially adding 10 parts of sodium tripolyphosphate, 5 parts of sodium bicarbonate, 2 parts of sodium hexametaphosphate, 2 parts of disodium ethylene diamine tetraacetate, 0.2 part of sodium dodecyl sulfate and 100 parts of water into a reactor with stirring, and uniformly stirring;
(2) under normal pressure, controlling the temperature to be 30-35 ℃, sequentially adding 3 parts of sulfamic acid, 5 parts of organic phosphoric acid, 2 parts of salicylic acid and 5 parts of isothiazolinone, and uniformly stirring and dissolving;
(3) and (2) continuously stirring at the temperature of 30-35 ℃ under normal pressure, analyzing the pH value to be 3-4 during stirring, adding ammonia water to adjust the pH value, and stirring for 2.5 hours to obtain the pH value of 5 of the cleaning agent.
The medicament is applied to cleaning a nanofiltration membrane system for extracting bromine brine, and has the following effects:
when the cleaning agent is used for cleaning the nanofiltration membrane, not only is the pressure difference and the water yield recovered well, but also the calcium and magnesium rejection rate is improved.
Claims (5)
1. A nanofiltration membrane cleaning agent for brine refining is characterized by being prepared by mixing the following components:
alkaline cleaning agent: 1-20 parts;
0-5 parts of dispersing agent sodium hexametaphosphate;
chelating agent disodium ethylene diamine tetraacetate, 0-5 parts;
acid cleaning agent: 2-40 parts;
surfactant (b): 0.1-1 part;
and (3) bactericide: 0.5-5 parts;
water: 80-200 parts of a binder;
pH regulator: ammonia or citric acid;
the pH value range of the cleaning agent is 2-8;
the alkaline cleaning agent comprises one or a combination of more of sodium tripolyphosphate, ethylene diamine tetraacetic acid tetrasodium salt and sodium citrate;
the acidic cleaning agent comprises one or more of citric acid, sulfamic acid, tartaric acid, malic acid, organic phosphoric acid, salicylic acid and ammonium citrate;
the surfactant comprises sodium dodecyl benzene sulfonate;
the bactericide is one or a mixture of more of isothiazolinone and derivatives thereof, organic bromine or organic bromine complex.
2. A nanofiltration membrane cleaning agent for brine purification according to claim 1, wherein the nanofiltration membrane cleaning agent comprises: the bactericide is organic bromine or organic bromine compound.
3. A nanofiltration membrane cleaning agent for brine purification according to claim 2, wherein the nanofiltration membrane cleaning agent comprises: the bactericide is 2, 2-dibromo-3-nitrilopropionamide.
4. A nanofiltration membrane cleaning agent for brine purification according to claim 1, wherein the nanofiltration membrane cleaning agent comprises:
the pH value range of the cleaning agent is 3-6.
5. A method for preparing a nanofiltration membrane cleaning agent for brine purification according to any one of claims 1 to 4, wherein the method comprises the following steps:
(1) adding an alkaline cleaning agent, a dispersing agent, a chelating agent and a surfactant into water according to parts in a reactor with stirring, and uniformly stirring;
(2) under normal pressure, controlling the temperature to be 20-40 ℃, sequentially adding the acidic cleaning agent and the bactericide, and uniformly stirring and dissolving;
(3) stirring at 20-40 deg.C under normal pressure for 2-4 hr, analyzing pH during stirring, and adjusting pH to 2-8 with ammonia water or citric acid.
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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 |
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| US11738310B2 (en) | 2019-12-31 | 2023-08-29 | Industrial Technology Research Institute | Method for cleaning membrane |
| CN112569656A (en) * | 2020-12-12 | 2021-03-30 | 山东海化集团有限公司 | Method for cleaning cartridge filter element of cartridge filter in brine system |
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