CN111249909A - Modification method of reverse osmosis membrane for drinking water purification - Google Patents
Modification method of reverse osmosis membrane for drinking water purification Download PDFInfo
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- CN111249909A CN111249909A CN202010293209.7A CN202010293209A CN111249909A CN 111249909 A CN111249909 A CN 111249909A CN 202010293209 A CN202010293209 A CN 202010293209A CN 111249909 A CN111249909 A CN 111249909A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
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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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
Abstract
The invention relates to a modification method of a reverse osmosis membrane for purifying drinking water, which is characterized by comprising the following steps: the common reverse osmosis membrane is subjected to cyclic treatment by adopting an acidic solution and an alkaline solution with certain concentrations, then is subjected to cyclic treatment by using a surfactant with certain concentrations, is washed by pure water, and is finally soaked by using a membrane modifier with certain concentrations. When the modified reverse osmosis membrane is applied to the northwest severe cold areas with lower water temperature, the water yield of the reverse osmosis membrane in the drinking water purification process can be obviously improved, and the desalination rate is not obviously reduced. The method can enable the reverse osmosis membrane to have higher water yield by adjusting the modification conditions according to the water treatment environment conditions of different regions. The reverse osmosis membrane modification method provided by the invention has wide application prospect in the drinking water purification process under the condition of low water temperature in the severe cold regions in the northwest.
Description
Technical Field
The technology relates to a modification method of a reverse osmosis membrane for purifying drinking water, belonging to the field of energy conservation and environmental protection.
Background
The membrane separation technology has the advantages of high purification degree, excellent water quality of produced water, convenient equipment operation, easy control of the purification process, easy integration with other technologies and the like, becomes one of the most concerned core technologies in the field of separation science at present, and is one of the most effective ways for deeply purifying drinking water. The membrane separation technology can effectively remove toxic and harmful substances such as suspended matters, colloids, organic matters, bacteria, viruses, inorganic ions and the like in water, and greatly improve the water quality.
Reverse osmosis membranes are membrane separation techniques that use pressure differentials as the driving force to separate the solvent from the solution. The reverse osmosis membrane can intercept various inorganic ions, colloids, macromolecular solutes and other substances in water, thereby achieving the aim of purifying water. The reverse osmosis process is simple in process and low in energy consumption, is rapidly developed in recent 20 years, is widely applied to drinking water deep purification, seawater and brackish water desalination, boiler water softening and wastewater treatment, is combined with ion exchange to prepare high-purity water, and has an expanded application range. At present, reverse osmosis membranes play more and more important roles in the aspects of drinking water purification, wastewater treatment, purification, concentration, separation and the like in the food, medicine and chemical industries.
Compared with other traditional separation projects, the reverse osmosis separation process has unique advantages: the pressure is the main power of the reverse osmosis separation process, and the energy consumption is low without the phase change of energy intensive exchange; the reverse osmosis does not need a large amount of precipitator and adsorbent, and the operation cost is low; the reverse osmosis separation process is simple in design and operation and short in construction period; the reverse osmosis has high purification efficiency and is environment-friendly. Due to good impurity separation capacity, low energy consumption and simple and environment-friendly operation mode, the reverse osmosis membrane is widely popularized and used in the deep purification treatment of drinking water.
The performance indexes of the reverse osmosis membrane mainly comprise desalination rate, water yield, chlorine resistance, pollution resistance and the like. The desalination rate is a key index for determining the application feasibility of the reverse osmosis membrane, the water yield is an important index for measuring the efficiency of the reverse osmosis membrane, the stability of the membrane can be improved by improving the chlorine resistance and pollution resistance of the membrane, the service life of the membrane is prolonged, and the treatment and cleaning cost is reduced. The performance of a reverse osmosis membrane is related to the structure and material of the membrane, and also related to environmental factors such as water quality, temperature and the like. Earlier researches find that the water yield of the reverse osmosis membrane with good performance in a high-temperature area is obviously reduced under the condition of low water temperature in a northwest alpine area, which seriously influences the application and popularization of the reverse osmosis membrane in the northwest alpine area.
At present, no relevant research report aiming at improving the separation performance of the reverse osmosis membrane under the condition of lower water temperature exists. The technology aims to improve the water yield of the reverse osmosis membrane under the condition of lower water temperature without obviously influencing the desalination rate by carrying out simple and feasible targeted modification treatment on the reverse osmosis membrane.
Disclosure of Invention
The invention aims to provide a modification method of a reverse osmosis membrane for purifying drinking water, which aims to solve the problem that the water yield of the reverse osmosis membrane is reduced under the condition of low water temperature in a northwest alpine region, wherein the reverse osmosis membrane is a reverse osmosis membrane or a reverse osmosis membrane element, the reverse osmosis membrane is made of one or two of cellulose acetate, aliphatic polyamide, aromatic polyamide and aromatic polyhydrazide, and the modification method comprises the following steps:
(1) performing circulating treatment on the reverse osmosis membrane by using one or more aqueous solutions of inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid or organic acids such as citric acid, oxalic acid and acetic acid with the mass concentration of 0.1-5%, wherein the treatment temperature is 20-45 ℃, and the treatment time is 0.5-5 hours;
(2) further circularly treating the reverse osmosis membrane treated by the acidic solution by using one or more aqueous solutions of inorganic alkali such as sodium hydroxide, potassium hydroxide, ammonium hydroxide and calcium hydroxide or organic alkali such as tetraethylammonium hydroxide and tetrapropylammonium hydroxide with the mass concentration of 0.1-5%, wherein the treatment temperature is 20-45 ℃, and the treatment time is 0.5-5 hours;
(3) the reverse osmosis membrane treated by the alkaline solution is further subjected to circulation treatment by using one of aqueous solution of anionic surfactant, cationic surfactant or nonionic surfactant with the mass concentration of 0.1-10%, the treatment temperature is 20-45 ℃, the treatment time is 0.5-5 hours, the anionic surfactant is one or more of sodium stearate, sodium dodecyl benzene sulfonate, polyacrylamide, alkyl sulfonate, fatty acid sulfoalkyl ester, succinate sulfonate, alkyl naphthalene sulfonate, petroleum sulfonate, lignin sulfonate and alkyl glyceryl ether sulfonate, the cationic surfactant is one or more of fatty ammonium salt, quaternary ammonium salt or heterocyclic ammonium salt, the nonionic surfactant is fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, fatty acid polyoxyethylene ester, polyoxyethylene alkylamine, polyoxyethylene alkyl ether, sodium lauryl ether, polyacrylamide, sodium lauryl ether, One or more of polyoxyethylene alkylamides and polyethers;
(4) circularly cleaning the reverse osmosis membrane treated by the surfactant by using pure water, wherein the temperature of the circular cleaning by using the pure water is 20-45 ℃, and the cleaning time is 0.5-10 hours;
(5) soaking the reverse osmosis membrane cleaned by pure water by using one or more aqueous solutions of membrane modifiers such as polyvinyl alcohol, isopropanol, dopamine, maleic anhydride and the like with the mass concentration of 0.1-10%, wherein the treatment temperature is 20-45 ℃, and the treatment time is 0.5-24 hours;
(6) and (3) curing the reverse osmosis membrane soaked by the membrane modifier under natural conditions, wherein the curing time is not less than 12 hours.
According to the invention, after the reverse osmosis membrane is subjected to acid-base circulation treatment, surfactant circulation treatment, pure water cleaning and membrane modifier soaking treatment, the pore diameter and surface charge of the reverse osmosis membrane can be finely adjusted, and the hydrophilicity of the reverse osmosis membrane can be improved, so that the reverse osmosis membrane has higher water yield under the condition of lower temperature, and the salt rejection rate is not obviously reduced, thereby the operation pressure and the operation cost of the reverse osmosis membrane are obviously reduced.
Detailed Description
The technical solutions of the present invention are described in detail below with reference to examples, and it is obvious that the described examples are some, but not all, examples of the present invention. Those skilled in the art can also make equivalent or modified embodiments within the technical scope of the present disclosure, and still fall within the scope of the present disclosure.
In the embodiments of the present invention, it should be noted that: the reverse osmosis membrane used in the following examples was a reverse osmosis membrane element (effective membrane area 7.9 m) produced by my company2) The test water temperature is about 12 ℃ (the average water temperature between winter equipment in northwest alpine regions such as inner Mongolia and the like), the test pressure is 1.03 MPa, the test water is groundwater in a certain drinking water source, and the content of soluble salt is about 800 mg/L.
Example 1
The modification method of the reverse osmosis membrane for purifying the drinking water provided by the embodiment comprises the following steps:
(1) circularly treating the reverse osmosis membrane by using a citric acid aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(2) further circularly treating the reverse osmosis membrane treated by the citric acid by using a sodium hydroxide aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(3) further circularly treating the reverse osmosis membrane treated by the sodium hydroxide by using a sodium dodecyl benzene sulfonate aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(4) circularly cleaning the reverse osmosis membrane treated by the sodium dodecyl benzene sulfonate by using pure water, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(5) soaking the reverse osmosis membrane cleaned by pure water by using a polyvinyl alcohol aqueous solution with the mass concentration of 2%, wherein the soaking temperature is 35 ℃, and the treatment time is 2 hours;
(6) and (3) curing the reverse osmosis membrane soaked in the polyvinyl alcohol aqueous solution under natural conditions for 24 hours.
The salt rejection and water yield of the reverse osmosis membrane before and after the modification treatment are shown in Table 1.
TABLE 1 Performance of reverse osmosis membranes before and after modification
Example 2
The modification method of the reverse osmosis membrane for purifying the drinking water provided by the embodiment comprises the following steps:
(1) circularly treating the reverse osmosis membrane by using a citric acid aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 4 hours;
(2) further circularly treating the reverse osmosis membrane treated by the citric acid by using a sodium hydroxide aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 4 hours;
(3) further circularly treating the reverse osmosis membrane treated by the sodium hydroxide by using a sodium dodecyl benzene sulfonate aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 4 hours;
(4) circularly cleaning the reverse osmosis membrane treated by the sodium dodecyl benzene sulfonate by using pure water, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(5) soaking the reverse osmosis membrane cleaned by pure water by using a polyvinyl alcohol aqueous solution with the mass concentration of 2%, wherein the treatment temperature is 35 ℃, and the treatment time is 4 hours;
(6) and (3) curing the reverse osmosis membrane soaked in the polyvinyl alcohol aqueous solution under natural conditions for 24 hours.
The salt rejection and water yield of the reverse osmosis membrane before and after the modification treatment are shown in Table 2.
TABLE 2 Performance of reverse osmosis membranes before and after modification
Example 3
The modification method of the reverse osmosis membrane for purifying the drinking water provided by the embodiment comprises the following steps:
(1) performing circulating treatment on the reverse osmosis membrane by using a citric acid aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(2) further circularly treating the reverse osmosis membrane treated by the citric acid by using a sodium hydroxide aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(3) further circularly treating the reverse osmosis membrane treated by the sodium hydroxide by using a sodium dodecyl benzene sulfonate aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(4) circularly cleaning the reverse osmosis membrane treated by the sodium dodecyl benzene sulfonate by using pure water, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(5) soaking the reverse osmosis membrane treated by pure water by using a polyvinyl alcohol aqueous solution with the mass concentration of 2%, wherein the treatment temperature is 35 ℃, and the treatment time is 4 hours;
(6) and (3) curing the reverse osmosis membrane soaked in the polyvinyl alcohol aqueous solution under natural conditions for 24 hours.
The salt rejection and water yield of the reverse osmosis membrane before and after the modification treatment are shown in Table 3.
TABLE 3 Performance of reverse osmosis membranes before and after modification
Example 4
The modification method of the reverse osmosis membrane for purifying the drinking water provided by the embodiment comprises the following steps:
(1) performing circulating treatment on the reverse osmosis membrane by using a citric acid aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(2) further circularly treating the reverse osmosis membrane treated by the citric acid by using a sodium hydroxide aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(3) further circularly treating the reverse osmosis membrane treated by the sodium hydroxide by using a sodium dodecyl benzene sulfonate aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(4) circularly cleaning the reverse osmosis membrane treated by the sodium dodecyl benzene sulfonate by using pure water, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(5) soaking the reverse osmosis membrane cleaned by pure water by using a polyvinyl alcohol aqueous solution with the mass concentration of 2%, wherein the treatment temperature is 35 ℃, and the treatment time is 4 hours;
(6) and (3) curing the reverse osmosis membrane soaked in the polyvinyl alcohol aqueous solution under natural conditions for 24 hours.
The salt rejection and water yield of the reverse osmosis membrane before and after the modification treatment are shown in Table 4.
TABLE 4 Performance of reverse osmosis membranes before and after modification
Example 5
The modification method of the reverse osmosis membrane for purifying the drinking water provided by the embodiment comprises the following steps:
(1) performing circulating treatment on the reverse osmosis membrane by using a citric acid aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(2) further circularly treating the reverse osmosis membrane treated by the citric acid by using a sodium hydroxide aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(3) further circularly treating the reverse osmosis membrane treated by the sodium hydroxide by using a polyacrylamide aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(4) circularly cleaning the reverse osmosis membrane treated by the polyacrylamide by using pure water at the temperature of 40 ℃ for 2 hours;
(5) soaking the reverse osmosis membrane cleaned by the pure water by using a maleic anhydride water solution with the mass concentration of 2%, wherein the treatment temperature is 35 ℃, and the treatment time is 4 hours;
(6) and (3) curing the reverse osmosis membrane soaked by the maleic anhydride aqueous solution under natural conditions for 24 hours.
The salt rejection and water yield of the reverse osmosis membrane before and after the modification treatment are shown in Table 5.
TABLE 5 Performance of reverse osmosis membranes before and after modification
Example 6
The modification method of the reverse osmosis membrane for purifying the drinking water provided by the embodiment comprises the following steps:
(1) performing circulating treatment on the reverse osmosis membrane by using a citric acid aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(2) further circularly treating the reverse osmosis membrane treated by the citric acid by using a sodium hydroxide aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(3) further circularly treating the reverse osmosis membrane treated by the sodium hydroxide by using a polyacrylamide aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(4) circularly cleaning the reverse osmosis membrane treated by the polyacrylamide by using pure water at the temperature of 40 ℃ for 2 hours;
(5) soaking the reverse osmosis membrane cleaned by pure water by using a maleic anhydride water solution with the mass concentration of 2%, wherein the treatment temperature is 40 ℃, and the treatment time is 4 hours;
(6) and (3) curing the reverse osmosis membrane soaked by the maleic anhydride aqueous solution under natural conditions for 24 hours.
The salt rejection and water yield of the reverse osmosis membrane before and after the modification treatment are shown in Table 6.
TABLE 6 Performance of reverse osmosis membranes before and after modification
Example 7
The modification method of the reverse osmosis membrane for purifying the drinking water provided by the embodiment comprises the following steps:
(1) circularly treating the reverse osmosis membrane by using a citric acid aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(2) further circularly treating the reverse osmosis membrane treated by the citric acid by using a tetrapropyl ammonium hydroxide aqueous solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(3) further circularly treating the reverse osmosis membrane treated by the sodium hydroxide by using a polyoxyethylene alkylamine water solution with the mass concentration of 0.5%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(4) circularly cleaning the reverse osmosis membrane treated by the polyoxyethylene alkylamine by using pure water, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(5) soaking the reverse osmosis membrane cleaned by pure water by using an isopropanol water solution with the mass concentration of 2%, wherein the treatment temperature is 35 ℃, and the treatment time is 4 hours;
(6) and (3) curing the reverse osmosis membrane soaked in the isopropanol aqueous solution under a natural condition for 24 hours.
The salt rejection and water yield of the reverse osmosis membrane before and after the modification treatment are shown in Table 7.
TABLE 7 Performance of reverse osmosis membranes before and after modification
Example 8
The modification method of the reverse osmosis membrane for purifying the drinking water provided by the embodiment comprises the following steps:
(1) performing circulating treatment on the reverse osmosis membrane by using a citric acid aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(2) further circularly treating the reverse osmosis membrane treated by the citric acid by using a tetrapropyl ammonium hydroxide aqueous solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(3) further circularly treating the reverse osmosis membrane treated by the sodium hydroxide by using a polyoxyethylene alkylamine water solution with the mass concentration of 1.0%, wherein the treatment temperature is 35 ℃, and the treatment time is 2 hours;
(4) circularly cleaning the reverse osmosis membrane treated by the polyoxyethylene alkylamine by using pure water, wherein the treatment temperature is 40 ℃, and the treatment time is 2 hours;
(5) soaking the reverse osmosis membrane cleaned by pure water by using an isopropanol water solution with the mass concentration of 2%, wherein the soaking temperature is 35 ℃, and the treatment time is 4 hours;
(6) and (3) curing the reverse osmosis membrane soaked in the isopropanol aqueous solution under a natural condition for 24 hours.
The salt rejection and water yield of the reverse osmosis membrane before and after the modification treatment are shown in Table 8.
TABLE 8 Performance of reverse osmosis membranes before and after modification
The above examples show that the water yield of a reverse osmosis membrane can be significantly increased without significantly reducing the salt rejection rate of the reverse osmosis membrane by treating with a membrane modifier after cyclic treatment with an acid-base solution and a surfactant. The invention can solve the problem that the reverse osmosis membrane has low water yield under the condition of low water temperature in alpine regions. The water yield of the reverse osmosis membrane under different environmental conditions can be modulated by modulating the concentration and temperature of the acid-base solution, the type, concentration and treatment temperature of the surfactant, and the concentration, treatment temperature and time of the membrane modifier, so that the adaptability of the reverse osmosis membrane is greatly improved.
Claims (10)
1. A modification method of a reverse osmosis membrane for purifying drinking water is characterized by comprising the following steps: the reverse osmosis membrane is a reverse osmosis membrane or a reverse osmosis membrane element, the reverse osmosis membrane is made of one or two of cellulose acetate, aliphatic polyamide, aromatic polyamide and aromatic polyhydrazide, and the modification method comprises the following steps:
(1) performing circulating treatment on the reverse osmosis membrane by using an acid solution;
(2) further carrying out circulation treatment on the reverse osmosis membrane treated by the acidic solution by using an alkaline solution;
(3) further performing circulation treatment on the reverse osmosis membrane treated by the alkaline solution by using a surfactant;
(4) circularly cleaning the reverse osmosis membrane treated by the surfactant by using pure water;
(5) soaking the reverse osmosis membrane cleaned by the pure water by using a membrane modifier;
(6) and (3) curing the reverse osmosis membrane soaked by the membrane modifier under natural conditions.
2. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 1, wherein: the acid solution is one or more aqueous solutions of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid and other inorganic acids or citric acid, oxalic acid, acetic acid and other organic acids with the mass concentration of 0.1-5%, the circulating treatment temperature is 20-45 ℃, and the treatment time is 0.5-5 hours.
3. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 1, wherein: the alkaline solution is one or more aqueous solutions of inorganic alkali such as sodium hydroxide, potassium hydroxide, ammonium hydroxide and calcium hydroxide with the mass concentration of 0.1-5%, or organic alkali such as tetraethylammonium hydroxide and tetrapropylammonium hydroxide, the circulating treatment temperature is 20-45 ℃, and the treatment time is 0.5-5 hours.
4. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 1, wherein: the surfactant is one of aqueous solution of anionic surfactant, cationic surfactant or nonionic surfactant with the mass concentration of 0.1-10%, the temperature of the circulating treatment is 20-45 ℃, and the treatment time is 0.5-5 hours.
5. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 4, wherein: the anionic surfactant is one or more of sodium stearate, sodium dodecyl benzene sulfonate, polyacrylamide, alkyl sulfonate, fatty acid alkyl sulfonate, succinate sulfonate, alkyl naphthalene sulfonate, petroleum sulfonate, lignosulfonate and alkyl glyceryl ether sulfonate.
6. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 4, wherein: the cationic surfactant is one or more of fatty ammonium salt, quaternary ammonium salt and heterocyclic ammonium salt.
7. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 4, wherein: the nonionic surfactant is one or more of fatty alcohol-polyoxyethylene ether, alkylphenol ethoxylate, fatty acid-polyoxyethylene ester, polyoxyethylene alkylamine, polyoxyethylene alkylamide and polyether.
8. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 1, wherein: the temperature of the pure water for circular cleaning is 20-45 ℃, and the processing time is 0.5-12 hours.
9. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 1, wherein: the membrane modifier is one or more aqueous solutions of polyvinyl alcohol, isopropanol, dopamine, maleic anhydride and the like, the mass concentration is 0.1-10%, the soaking temperature is 20-45 ℃, and the treatment time is 0.5-24 hours.
10. The method of modifying a reverse osmosis membrane for drinking water purification according to claim 1, wherein: and (3) curing the reverse osmosis membrane soaked by the membrane modifier under natural conditions, wherein the curing time is not less than 12 hours.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113457456A (en) * | 2021-07-29 | 2021-10-01 | 厦门嘉戎技术股份有限公司 | Modification and reutilization method of waste reverse osmosis membrane |
| CN114534512A (en) * | 2022-03-01 | 2022-05-27 | 北京碧水源分离膜科技有限公司 | Preparation method and application of reverse osmosis membrane |
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