CN107413196B - forward osmosis membrane preparation method and method for treating pesticide wastewater by using forward osmosis membrane - Google Patents
forward osmosis membrane preparation method and method for treating pesticide wastewater by using forward osmosis membrane Download PDFInfo
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- CN107413196B CN107413196B CN201710258037.8A CN201710258037A CN107413196B CN 107413196 B CN107413196 B CN 107413196B CN 201710258037 A CN201710258037 A CN 201710258037A CN 107413196 B CN107413196 B CN 107413196B
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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
- B01D61/002—Forward osmosis or direct osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
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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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- 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
- C02F1/445—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by forward osmosis
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/306—Pesticides
Abstract
The invention discloses a preparation method of a forward osmosis membrane and a method for treating pesticide wastewater by using the forward osmosis membrane, which comprises the following steps: (1) preparing a forward osmosis membrane porous support material, comprising the following steps: adding water into attapulgite to obtain a suspension; adding cetyl trimethyl ammonium bromide into the suspension liquid container after ultrasonic treatment, stirring and filtering to obtain a sample; (c) sequentially adding ethanol and mercaptopropyl trimethoxy silane into a sample, and treating to obtain a porous support material; (2) preparing a forward osmosis membrane; (3) the forward osmosis membrane is installed in the forward osmosis device, then pesticide wastewater is used as raw material liquid and is led into the forward osmosis device, and finally pure water is produced through the reverse osmosis membrane. The method can adsorb most of pollutants in the wastewater.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a preparation method of a forward osmosis membrane with functions of pollutant adsorption, dehydration and sterilization, and a recycling process flow for jointly treating pesticide wastewater by combining with a reverse osmosis technology.
background
along with the consumption of a large amount of water resources in production and life and the large-scale discharge of wastewater, fresh water resources are seriously deficient, and the demand of fresh water resources is increased day by day, so that the technology for producing fresh water is endlessly developed, especially the application research of distillation technology and membrane separation technology is the most prominent, but the former consumes much more energy than the latter, and the development of the membrane separation technology becomes the key point of research and development of the business industry and the academic community. The membrane separation technology can be used for seawater desalination, can also be used for taking water from wastewater, and reduces the pollution problem of water resources. The membrane separation technology for dehydration mainly comprises reverse osmosis technology and forward osmosis technology, and the forward osmosis technology has the advantages of low energy consumption, high separation effect, simple operation, low membrane pollution, capability of separating various water qualities and the like, so that the forward osmosis technology becomes a novel membrane separation technology which is eagerly developed by researchers, but the subsequent fresh water recovery is still a problem which is continuously explored.
China is a large country for agricultural production, the production of pesticides is increasing day by day, pollutants generated in the production process have the characteristics of high concentration, high toxicity, high irritation and the like, serious threat is caused to water bodies, and the pollutants can be discharged into the water bodies after being treated, so that the effective treatment of pesticide wastewater is a great problem to be solved and explored urgently. The pesticide wastewater contains a large amount of benzenes, phenols, COD, salt substances and heavy metals, and some pollutant microorganisms are difficult to degrade and difficult to treat, so that the ecological environment and the human health are seriously damaged, and the high attention in the field of sewage treatment is attracted.
at present, agricultural wastewater treatment methods are numerous, but the treatment process is complex, the resource utilization rate is poor, a large amount of energy is consumed, and the social economic pressure is increased. Chinese patent publication No. CN 105923704a discloses "a forward osmosis draw solution recycling method and a wastewater treatment method". Although the forward osmosis and ion exchange technologies are combined, the process is simple and low in energy consumption, and pollutants are treated only and cannot be easily used for treating pesticide wastewater. Chinese patent publication No. CN 104230081B discloses a 'paraquat pesticide wastewater treatment process'. The method has strict operation conditions, large energy consumption and complex process, and the treated waste liquid is not effectively utilized, thereby causing the waste of resources and energy. Chinese patent publication No. CN 104609610B discloses "a method for treating reverse osmosis concentrated water and circulating sewage water by a full membrane method". The method has high treatment effect and no pollution, but the repeated use of the reverse osmosis technology and the large consumption of the alkali addition amount greatly increase the consumption of energy and cost, and are not beneficial to the construction and development of a resource-saving society.
Disclosure of Invention
the invention aims to overcome the defects of the prior art and provide a preparation method of a forward osmosis membrane with comprehensive performances of adsorption, dehydration, sterilization and the like, and a method for efficiently treating pesticide wastewater, which is low in energy consumption, simple and feasible and capable of recycling membrane materials, and is combined with a reverse osmosis technology to treat pesticide wastewater.
The purpose of the invention is realized by the following scheme:
The invention provides a preparation method of a forward osmosis membrane, which comprises the following steps:
(1) The preparation method of the forward osmosis membrane porous support material comprises the following specific steps:
(a) adding water into attapulgite with the particle size of 50-150 meshes to obtain a suspension, and then carrying out ultrasonic treatment on the suspension in an ultrasonic dispersion machine for 30-60 min, wherein the solid-to-liquid ratio of the attapulgite to the water is 1:40 g/mL-1: 100 g/mL;
(b) adding hexadecyl trimethyl ammonium bromide into a suspension liquid container after ultrasonic treatment, wherein the mass ratio of the hexadecyl trimethyl ammonium bromide to the concave-convex rod in the suspension liquid is 1:1 g/g-1: 10g/g, then placing the solution at 10-30 ℃, stirring for 6-10 h, filtering, repeatedly washing a sample on filter paper by using distilled water until AgNO is dripped into the liquid after the sample is filtered3the solution has no white precipitate, the sample is dried for 20-30 min at 100-110 ℃, and then ground and sieved by a 100-200 mesh sieve;
(c) Sequentially adding ethanol with a solid-liquid ratio of 1:50 g/mL-1: 150g/mL and mercaptopropyl trimethoxysilane with a solid-liquid ratio of 1:1 g/mL-1: 5g/mL into a sample with a particle size of 100-200 meshes, heating, refluxing, stirring for 2-8 h, cooling, filtering, washing the sample with ethanol for 3-4 times, vacuum-drying the sample at 40-60 ℃ for 10-20 min, grinding, and sieving with a 50-150 mesh sieve to obtain a porous support material with a particle size of 50-150 meshes;
(2) the preparation method of the forward osmosis membrane comprises the following specific steps:
(a) adding N, N-dimethylformamide, N-methyl pyrrolidone, ethanol and maleic acid into cellulose triacetate in sequence to prepare a mixed solution, wherein the mass of each substance in the mixed solution accounts for 10-30% of the total mass of the solution, and the mixed solution comprises 10-30% of the cellulose triacetate, 20-30% of the N, N-dimethylformamide, 30-40% of the N-methyl pyrrolidone, 10-15% of the ethanol and 5-10% of the maleic acid;
(b) Mechanically stirring the mixed solution in the step (a) at 30-40 ℃ for 3-4 h to form a casting solution, and then standing and defoaming for 1-2 h;
(c) Spreading the porous support material obtained in the step (1) on a clean glass plate, then spreading the casting film solution on the porous support material, scraping the casting film solution into a film with the thickness of 100um, and then evaporating the film for 30-50 s at the temperature of 20-30 ℃;
(d) And (3) immersing the glass plate into a cold water bath to solidify a sample on the glass plate, and finally washing the sample with distilled water to obtain the forward osmosis membrane.
a method for treating pesticide wastewater by adopting a forward osmosis membrane comprises the following steps:
The method comprises the steps of installing a forward osmosis membrane into a forward osmosis device, introducing pesticide wastewater serving as a raw material liquid into the forward osmosis device, adjusting the raw material liquid to be neutral by using 1mol/L sodium hydroxide or hydrochloric acid, introducing a diluted sodium chloride solution into a reverse osmosis device serving as the raw material liquid after 30-60 min by using saturated sodium chloride at 20 ℃ as a draw solution, wherein the operating pressure in the reverse osmosis device is 0.5-5.5 MPa, and finally passing through the reverse osmosis membrane to produce pure water.
Compared with the prior wastewater treatment process, the invention has the following advantages:
(1) the support material is obtained by taking attapulgite as a substrate through an organic modification method. The attapulgite has the advantages of low cost, abundant reserves, high mechanical strength, high porosity, no toxicity, harmlessness and better adsorption performance.
(2) The porous support material has large pore volume and high water flux; can adsorb various pollutants such as heavy metal ions, COD, benzene, phenols and the like, has strong adsorbability, and can adsorb most of pollutants in the wastewater; the adsorbed substances can be recovered by desorption, and the unadsorbed high-concentration salt solution can be recycled; it also has antibacterial and disinfectant effects.
(3) The method has the advantages of simple and feasible process flow, low energy consumption, cyclic utilization, zero emission, time and labor conservation, resource conservation and realization of reasonable utilization of wastes.
drawings
FIG. 1 is a process flow diagram of a method for treating pesticide wastewater using a forward osmosis membrane.
Detailed Description
FIG. 1 is a process flow diagram of the present invention, which is further described in detail below by way of specific embodiments.
The invention provides a preparation method of a forward osmosis membrane, which comprises the following steps:
(1) The preparation method of the forward osmosis membrane porous support material comprises the following specific steps:
(a) adding water into attapulgite with the particle size of 50-150 meshes to obtain a suspension, and then carrying out ultrasonic treatment on the suspension in an ultrasonic dispersion machine for 30-60 min, wherein the solid-to-liquid ratio of the attapulgite to the water is 1:40 g/mL-1: 100 g/mL;
(b) adding hexadecyl trimethyl ammonium bromide into a suspension liquid container after ultrasonic treatment, wherein the mass ratio of the hexadecyl trimethyl ammonium bromide to the concave-convex rod in the suspension liquid is 1:1 g/g-1: 10g/g, then placing the solution at 10-30 ℃, stirring for 6-10 h, filtering, repeatedly washing a sample on filter paper by using distilled water until AgNO is dripped into the liquid after the sample is filtered3The solution has no white precipitate, the sample is dried for 20-30 min at 100-110 ℃, and then ground and sieved by a 100-200 mesh sieve;
(c) Sequentially adding ethanol with a solid-liquid ratio of 1:50 g/mL-1: 150g/mL and mercaptopropyl trimethoxysilane with a solid-liquid ratio of 1:1 g/mL-1: 5g/mL into a sample with a particle size of 100-200 meshes, heating, refluxing, stirring for 2-8 h, cooling, filtering, washing the sample with ethanol for 3-4 times, vacuum-drying the sample at 40-60 ℃ for 10-20 min, grinding, and sieving with a 50-150 mesh sieve to obtain a porous support material with a particle size of 50-150 meshes;
(2) The preparation method of the forward osmosis membrane comprises the following specific steps:
(a) Adding N, N-dimethylformamide, N-methyl pyrrolidone, ethanol and maleic acid into cellulose triacetate in sequence to prepare a mixed solution, wherein the mass of each substance in the mixed solution accounts for 10-30% of the total mass of the solution, and the mixed solution comprises 10-30% of the cellulose triacetate, 20-30% of the N, N-dimethylformamide, 30-40% of the N-methyl pyrrolidone, 10-15% of the ethanol and 5-10% of the maleic acid;
(b) mechanically stirring the mixed solution in the step (a) at 30-40 ℃ for 3-4 h to form a casting solution, and then standing and defoaming for 1-2 h;
(c) spreading the porous support material obtained in the step (1) on a clean glass plate, then spreading the casting film solution on the porous support material, scraping the casting film solution into a film with the thickness of 100um, and then evaporating the film for 30-50 s at the temperature of 20-30 ℃;
(d) and (3) immersing the glass plate into a cold water bath to solidify a sample on the glass plate, and finally washing the sample with distilled water to obtain the forward osmosis membrane.
the invention provides a method for treating pesticide wastewater by adopting a forward osmosis membrane, which comprises the following steps:
(1) The preparation method of the forward osmosis membrane porous support material comprises the following specific steps:
(a) adding water into attapulgite with the particle size of 50-150 meshes to obtain a suspension, and then carrying out ultrasonic treatment on the suspension in an ultrasonic dispersion machine for 30-60 min, wherein the solid-to-liquid ratio of the attapulgite to the water is 1:40 g/mL-1: 100 g/mL;
(b) Adding hexadecyl trimethyl ammonium bromide into a suspension liquid container after ultrasonic treatment, wherein the mass ratio of the hexadecyl trimethyl ammonium bromide to the concave-convex rod in the suspension liquid is 1:1 g/g-1: 10g/g, then placing the solution at 10-30 ℃, stirring for 6-10 h, filtering, repeatedly washing a sample on filter paper by using distilled water until AgNO is dripped into the liquid after the sample is filtered3And (3) no white precipitate is generated in the solution, the sample is dried for 20-30 min at the temperature of 100-110 ℃, and then ground and sieved by a 100-200-mesh sieve.
(c) Adding ethanol with a solid-liquid ratio of 1:50 g/mL-1: 150g/mL and mercaptopropyl trimethoxysilane with a solid-liquid ratio of 1:1 g/mL-1: 5g/mL into a sample with a particle size of 100-200 meshes in sequence, heating, refluxing, stirring for 2-8 h, cooling, filtering, washing the sample with ethanol for 3-4 times, drying the sample at 40-60 ℃ for 10-20 min in vacuum, grinding, and sieving with a 50-150 mesh sieve to obtain the porous support material with the particle size of 50-150 meshes.
(2) The preparation method of the forward osmosis membrane comprises the following specific steps:
(a) the preparation method comprises the following steps of sequentially adding N, N-dimethylformamide, N-methyl pyrrolidone, ethanol and maleic acid into cellulose triacetate to prepare a mixed solution, wherein the mass of each substance in the mixed solution accounts for 10-30% of the total mass of the solution, and the mixed solution comprises 10-30% of the cellulose triacetate, 20-30% of the N, N-dimethylformamide, 30-40% of the N-methyl pyrrolidone, 10-15% of the ethanol and 5-10% of the maleic acid.
(b) mechanically stirring the mixed solution in the step (a) at 30-40 ℃ for 3-4 h to form a casting solution, and then standing and defoaming for 1-2 h.
(c) and (2) flatly paving the porous support material obtained in the step (1) on a clean glass plate, then paving the casting film solution on the porous support material, scraping the casting film solution into a film with the thickness of 100um, and then evaporating the film for 30-50 s at the temperature of 20-30 ℃.
(d) And (3) immersing the glass plate into a cold water bath to solidify a sample on the glass plate, and finally washing the sample with distilled water to obtain the forward osmosis membrane.
(3) The method comprises the steps of installing the forward osmosis membrane into a forward osmosis device, introducing pesticide wastewater serving as a raw material liquid into the forward osmosis device, adjusting the raw material liquid to be neutral by using 1mol/L sodium hydroxide or hydrochloric acid, introducing a diluted sodium chloride solution into a reverse osmosis device serving as the raw material liquid after 30-60 min by using saturated sodium chloride at the temperature of 20 ℃, wherein the operating pressure in the reverse osmosis device is 0.5-5.5 MPa, and finally producing pure water by permeating the reverse osmosis membrane.
preferably, the solute part of the raw material liquid in the forward osmosis device is adsorbed by the porous supporting material of the forward osmosis membrane, the residual salt is only salt, the concentration of the salt is gradually increased, the salt solution after the osmosis treatment of the forward osmosis device is directly used as the drawing liquid, the use amount of sodium chloride is saved, and the resource is recycled.
Example 1
(1) The preparation process of the forward osmosis membrane porous support material comprises the following specific steps: (a) grinding 2g of attapulgite, sieving with 150 mesh sieve, adding 80mL of water, and ultrasonic treating the suspension in an ultrasonic disperser for 30 min. (b) Taking out the suspension, placing the suspension into a flask, adding 0.2g of hexadecyl trimethyl ammonium bromide into the flask, then placing the flask at 10 ℃, stirring the flask for 6 hours, filtering the suspension, and then repeatedly washing a sample on the filter paper by using distilled water until AgNO is dropwise added into the filtrate3No white precipitate was formed in the solution. And then the sample is dried for 20min at 100 ℃, and finally ground and sieved by a 200-mesh sieve. (c) And (c) taking 1g of the sample prepared in the step (b), sequentially adding 50mL of ethanol and 1mL of mercaptopropyl trimethoxy silane, heating, refluxing, stirring for 2h, cooling, filtering, washing the sample with ethanol for 3 times, vacuum-drying the sample at 40 ℃ for 10min, and finally grinding and sieving with a 150-mesh sieve to obtain the porous support material.
(2) The preparation process of the forward osmosis membrane comprises the following specific steps: 10g of cellulose triacetate was placed in a flask, and 30g of N, N-dimethylformamide, 40g of N-methylpyrrolidone, 10g of ethanol and 10g of maleic acid were sequentially added to prepare a solution. (b) Mechanically stirring the mixed solution in the step (a) at 30 ℃ for 3 hours to form casting solution, and then standing and defoaming for 1 hour. (c) The porous support material of step (1) was spread on a clean glass plate, and then the casting film solution was spread on the material, scraped into a film having a thickness of 100um, and evaporated at 20 ℃ for 30 seconds. (d) And immersing the glass plate into a cold water bath to solidify a sample on the glass plate, and finally, washing the sample clean by using distilled water to obtain the forward osmosis membrane.
(3) The forward-reverse osmosis combined technology and the pesticide wastewater treatment process using the forward-reverse osmosis combined technology specifically comprise the following steps:
The method comprises the steps of introducing acidic pesticide wastewater serving as a raw material liquid into a forward osmosis device, adjusting the pH value to be neutral by using a 1mol/L sodium hydroxide solution, taking saturated sodium chloride as a draw solution, introducing a diluted sodium chloride solution into a reverse osmosis device after 30min to serve as the raw material liquid, wherein the operating pressure in the reverse osmosis device is 0.5MPa, and finally passing through the reverse osmosis membrane to produce pure water. And simultaneously, the salt solution subjected to the osmosis treatment of the forward osmosis device is directly used as a drawing solution.
example 2
(1) The preparation process of the forward osmosis membrane porous support material comprises the following specific steps: (a) grinding 1g attapulgite, sieving with 50 mesh sieve, adding 70mL water, and ultrasonic dispersing for 60 min. (b) Taking out the suspension, placing the suspension into a flask, adding 0.2g of hexadecyl trimethyl ammonium bromide into the suspension, stirring the suspension at 20 ℃ for 8 hours, filtering the suspension, and repeatedly washing a sample on the filter paper by using distilled water until AgNO is dropwise added into the filtrate3No white precipitate was formed in the solution. The sample is dried at 105 ℃ for 25min, and finally ground and sieved by a 100-mesh sieve. (c) Taking 0.5g of the sample prepared in step (b), adding 50mL of ethanol and 1.25mL of mercaptopropyltrimethoxysilane in sequence, then heating, refluxing and stirring for 6h, then cooling, filtering, washing the sample with ethanol for 4 times, then vacuum-drying the sample at 50 ℃ for 15min, preferably grinding and sieving with a 50-mesh sieveand obtaining the porous support material.
(2) the preparation process of the forward osmosis membrane comprises the following specific steps: 4g of cellulose triacetate was placed in a flask, and 5g of N, N-dimethylformamide, 7g of N-methylpyrrolidone, 2.5g of ethanol, and 1.5g of maleic acid were sequentially added to prepare a solution. (b) Mechanically stirring the mixed solution in the step (a) at 35 ℃ for 3.5 hours to form casting solution, and then standing and defoaming for 1.5 hours. (c) The porous support material of step (1) was spread on a clean glass plate, and then the casting film solution was spread on the material, scraped to a film thickness of 100um, and evaporated at 25 ℃ for 40 seconds. (d) And immersing the glass plate into a cold water bath to solidify a sample on the glass plate, and finally, washing the sample clean by using distilled water to obtain the forward osmosis membrane.
(3) The forward-reverse osmosis combined technology and the pesticide wastewater treatment process using the forward-reverse osmosis combined technology specifically comprise the following steps:
the method comprises the steps of introducing acidic pesticide wastewater serving as a raw material liquid into a forward osmosis device, adjusting the pH value to be neutral by using a 1mol/L sodium hydroxide solution, taking saturated sodium chloride as a draw solution, introducing a diluted sodium chloride solution into a reverse osmosis device after 45min to serve as the raw material liquid, wherein the operating pressure in the reverse osmosis device is 3MPa, and finally passing through the reverse osmosis membrane to produce pure water. And simultaneously, the salt solution subjected to the osmosis treatment of the forward osmosis device is directly used as a drawing solution.
example 3
(1) the preparation process of the forward osmosis membrane porous support material comprises the following specific steps: (a) grinding 3g attapulgite, sieving with 100 mesh sieve, adding 300mL water, and ultrasonic dispersing for 45 min. (b) Taking out the suspension, placing the suspension into a flask, adding 3g of hexadecyl trimethyl ammonium bromide into the suspension, then placing the suspension at 30 ℃, stirring the suspension for 10 hours, filtering the suspension, and then repeatedly washing a sample on the filter paper by using distilled water until AgNO is dropwise added into the filtrate3No white precipitate was formed in the solution. And then the sample is dried for 30min at 110 ℃, and finally ground and sieved by a 150-mesh sieve. (c) Taking 2g of the sample prepared in the step (b), sequentially adding 300mL of ethanol and 10mL of mercaptopropyl trimethoxysilane, heating, refluxing, stirring for 8 hours, cooling, filtering, washing the sample with ethanol for 4 times, and then placing the sample at 60 DEG Cvacuum drying for 20min, and finally grinding and sieving with a 100-mesh sieve to obtain the porous support material.
(2) The preparation process of the forward osmosis membrane comprises the following specific steps: 3g of cellulose triacetate was placed in a flask, and 2g of N, N-dimethylformamide, 3g of N-methylpyrrolidone, 1.5g of ethanol, and 0.5g of maleic acid were sequentially added to prepare a solution. (b) Mechanically stirring the mixed solution in the step (a) at 40 ℃ for 4 hours to form casting solution, and then standing and defoaming for 2 hours. (c) The porous support material of step (1) was spread on a clean glass plate, and then the casting film solution was spread on the material, scraped to a film thickness of 100um, and evaporated at 30 ℃ for 50 s. (d) And immersing the glass plate into a cold water bath to solidify a sample on the glass plate, and finally, washing the sample clean by using distilled water to obtain the forward osmosis membrane.
(3) the forward-reverse osmosis combined technology and the pesticide wastewater treatment process using the forward-reverse osmosis combined technology specifically comprise the following steps:
the method comprises the steps of introducing acidic pesticide wastewater serving as a raw material liquid into a forward osmosis device, adjusting the pH value to be neutral by using a 1mol/L sodium hydroxide solution, taking saturated sodium chloride as a draw solution, introducing a diluted sodium chloride solution into a reverse osmosis device after 60min to serve as the raw material liquid, wherein the operating pressure in the reverse osmosis device is 5.5MPa, and finally passing through the reverse osmosis membrane to produce pure water. And simultaneously, the salt solution subjected to the osmosis treatment of the forward osmosis device is directly used as a drawing solution.
The performance of the pesticide wastewater treated in the above examples 1 to 3 is detected, and the specific steps are as follows:
Respectively adding the same amount of pesticide wastewater, measuring and calculating the treatment capacity of the pesticide wastewater, the obtained pure water and the amount of sodium chloride in the pure water after treatment, wherein the measurement results are respectively shown in the following table:
As can be seen from the above table, the process conditions in example 2 were the best, the wastewater treatment amount and the amount of produced pure water were the highest, and the effect was not much different from that in example 3, but the salt rejection was reduced under the conditions in example 3 because the solute permeated the reverse osmosis membrane. Therefore, the process conditions in example 2 are the best, and the pesticide wastewater can be effectively removed, and pure water is produced.
the method of the present invention has been described in detail with reference to the above embodiments, but the present invention is not limited to the above embodiments, and the experimental conditions and the method can be flexibly changed without departing from the scope of the present invention, which falls within the protection scope of the present invention. Therefore, the patent and protection scope of the present invention should be subject to the appended claims.
Claims (3)
1. A method for producing a forward osmosis membrane, characterized by comprising the steps of:
(1) The preparation method of the forward osmosis membrane porous support material comprises the following specific steps:
(a) Adding water into attapulgite with the particle size of 50-150 meshes to obtain a suspension, and then carrying out ultrasonic treatment on the suspension in an ultrasonic dispersion machine for 30-60 min, wherein the solid-to-liquid ratio of the attapulgite to the water is 1:40 g/mL-1: 100 g/mL;
(b) adding hexadecyl trimethyl ammonium bromide into a suspension liquid container after ultrasonic treatment, wherein the mass ratio of the hexadecyl trimethyl ammonium bromide to the concave-convex rod in the suspension liquid is 1:1 g/g-1: 10g/g, then placing the solution at 10-30 ℃, stirring for 6-10 h, filtering, repeatedly washing a sample on filter paper by using distilled water until AgNO is dripped into the liquid after the sample is filtered3the solution has no white precipitate, the sample is dried for 20-30 min at 100-110 ℃, and then ground and sieved by a 100-200 mesh sieve;
(c) Sequentially adding ethanol with a solid-liquid ratio of 1:50 g/mL-1: 150g/mL and mercaptopropyl trimethoxysilane with a solid-liquid ratio of 1:1 g/mL-1: 5g/mL into a sample with a particle size of 100-200 meshes, heating, refluxing, stirring for 2-8 h, cooling, filtering, washing the sample with ethanol for 3-4 times, vacuum-drying the sample at 40-60 ℃ for 10-20 min, grinding, and sieving with a 50-150 mesh sieve to obtain a porous support material with a particle size of 50-150 meshes;
(2) the preparation method of the forward osmosis membrane comprises the following specific steps:
(a) Adding N, N-dimethylformamide, N-methylpyrrolidone, ethanol and maleic acid into cellulose triacetate in sequence to prepare a mixed solution, wherein the mass of each substance in the mixed solution accounts for 10-30% of the total mass of the solution, and the mixed solution comprises 10-30% of the cellulose triacetate, 20-30% of the N, N-dimethylformamide, 30-40% of the N-methylpyrrolidone, 10-15% of the ethanol and 5-10% of the maleic acid;
(b) Mechanically stirring the mixed solution in the step (a) at 30-40 ℃ for 3-4 h to form a casting solution, and then standing and defoaming for 1-2 h;
(c) Spreading the porous support material obtained in the step (1) on a clean glass plate, then spreading the casting film solution on the porous support material, scraping the casting film solution into a film with the thickness of 100um, and then evaporating the film for 30-50 s at the temperature of 20-30 ℃;
(d) And (3) immersing the glass plate into a cold water bath to solidify a sample on the glass plate, and finally washing the sample with distilled water to obtain the forward osmosis membrane.
2. A method for treating agricultural wastewater using a forward osmosis membrane prepared by the method of claim 1, comprising the steps of: the method comprises the steps of installing a forward osmosis membrane into a forward osmosis device, introducing pesticide wastewater serving as a raw material liquid into the forward osmosis device, adjusting the raw material liquid to be neutral by using 1mol/L sodium hydroxide or hydrochloric acid, introducing a diluted sodium chloride solution into a reverse osmosis device serving as the raw material liquid after 30-60 min by using saturated sodium chloride at 20 ℃ as a draw solution, wherein the operating pressure in the reverse osmosis device is 0.5-5.5 MPa, and finally passing through the reverse osmosis membrane to produce pure water.
3. the method for treating pesticidal wastewater according to claim 2, characterized in that: the salt solution after the osmosis treatment of the forward osmosis device is directly used as a drawing liquid.
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| US20100140162A1 (en) * | 2008-10-24 | 2010-06-10 | Juzer Jangbarwala | Osmosis membrane with improved flux rate and uses thereof |
| CN102921307A (en) * | 2012-11-13 | 2013-02-13 | 哈尔滨工业大学 | Preparation method of high-performance forward osmosis membrane |
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| US20100140162A1 (en) * | 2008-10-24 | 2010-06-10 | Juzer Jangbarwala | Osmosis membrane with improved flux rate and uses thereof |
| CN102921307A (en) * | 2012-11-13 | 2013-02-13 | 哈尔滨工业大学 | Preparation method of high-performance forward osmosis membrane |
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