CN119707170B - Anti-fouling saline-alkali water desalination method and equipment - Google Patents
Anti-fouling saline-alkali water desalination method and equipmentInfo
- Publication number
- CN119707170B CN119707170B CN202411950264.3A CN202411950264A CN119707170B CN 119707170 B CN119707170 B CN 119707170B CN 202411950264 A CN202411950264 A CN 202411950264A CN 119707170 B CN119707170 B CN 119707170B
- Authority
- CN
- China
- Prior art keywords
- micro
- nano
- water
- desalination
- saline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a method and equipment for desalting anti-fouling saline-alkali water. The anti-fouling saline-alkali water desalination method comprises the following steps of primary precipitation of saline-alkali water, heating, micro-nano desalination and water production, wherein the micro-nano desalination column comprises micro-nano support columns and desalination membranes wrapped outside the micro-nano support columns, and a polyurethane elastomer layer is arranged between the micro-nano support columns and the desalination membranes. According to the anti-fouling saline-alkali water desalination method, the carbon nano tubes, the silicon carbide and the like of the desalination membrane form a composite water channel, hydrated ions cannot pass through the desalination membrane, and only water and a small part of ions can pass through the desalination membrane, so that separation of water and salt is realized.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a method and equipment for desalting anti-fouling saline-alkali water.
Background
Saline-alkali soil refers to soil with too high salt content in soil to affect crop growth, and most saline-alkali soil cannot plant crops. In order to utilize the land resources of the saline-alkali land, the prior art needs to carry out desalination treatment on the saline-alkali water in the soil of the saline-alkali land so as to meet the growth needs of crops or other plants. Through long-term agricultural practices, salt washing is still an important means for improving saline-alkali soil. But a large amount of saline-alkali water is generated in the salt washing process, the saline-alkali water has the characteristics of high pH value, high carbonate alkalinity, high ion coefficient and various water quality types, if the saline-alkali water is directly discharged as wastewater, serious waste of water resources is caused, and the high salinity in the saline-alkali water also causes damage to ecological environment.
At present, the common water purification technology using reverse osmosis membrane and nanofiltration as cores is used for purifying the saline-alkali water, but the problems of complex equipment, large occupied area, high purification cost and the like exist, so that the micro-nano desalting column with a composite tube cavity structure is built by mixing carbon nano tubes, graphene oxide and silicon carbide in the prior art, the target passing of water salt is realized by combining micro-nano Guan Wei nano flow through identification of charge, ion diameter and the like, but organic macromolecules in saline-alkali water can be trapped on the surface of the micro-nano desalting column, so that an ion screening membrane is blocked, and meanwhile, the Ca 2+、Mg2+ concentration in the saline-alkali water is high, and Ca 2+、Mg2+ easily causes the surface of the micro-nano desalting column positioned on one side of the saline-alkali water to scale.
Disclosure of Invention
The invention provides a method for desalting anti-fouling saline-alkali water, which aims to solve the technical problem that a micro-nano desalting column is blocked due to scaling of organic macromolecules and Ca 2+、Mg2+ in saline-alkali water.
The second purpose of the invention is to provide a pollution-blocking-resistant saline-alkali water desalting device.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for desalting saline-alkali water with anti-fouling effect comprises the following steps of primary precipitation of saline-alkali water, heating, micro-nano desalting and water production, wherein the micro-nano desalting is carried out by adopting a micro-nano desalting column, the micro-nano desalting column comprises a micro-nano supporting column and a desalting membrane wrapped outside the micro-nano supporting column, and a polyurethane elastomer layer is arranged between the micro-nano supporting column and the desalting membrane.
Further, the preparation method of the desalination membrane comprises the following steps:
S1, performing alkali washing on graphene oxide to obtain alkali washed graphene oxide, dispersing gamma- (2, 3-glycidoxy) propyl trimethoxy silane in a mixed solvent to obtain a mixed solution, adding the alkali washed graphene oxide into the mixed solution, heating and refluxing, centrifuging to obtain a solid, washing the solid, dispersing the solid in water, and performing ultrasonic dispersion to obtain a dispersion liquid I;
s2, placing silicon carbide and carbon nanotubes in ethanol and performing ultrasonic dispersion to obtain a dispersion liquid II, coating the dispersion liquid II on a polyether sulfone membrane, and drying to obtain a substrate membrane;
And S3, coating the dispersion liquid I in S1 on the substrate film in S2 to obtain the desalting film.
Further, 1-2 g of gamma- (2, 3-glycidoxy) propyl trimethoxy silane is correspondingly added into each 100 mg of the alkali-washed graphene oxide in the S1, 180-200 mL of a mixed solvent is correspondingly added into each g of gamma- (2, 3-glycidoxy) propyl trimethoxy silane, the mixed solvent is a mixed solvent of water and ethanol, and the volume ratio of the water to the ethanol is 1:2.5-1:3.5.
Further, the temperature of the heating reflux in the step S1 is 60-75 ℃ and the time is 3-4 hours.
Further, the preparation method of the micro-nano desalting column comprises the following steps:
s1, preparing a micro-nano support column matrix from straws by a 3D printing technology, soaking the micro-nano support column matrix in polyurethane elastomer soaking liquid to obtain a micro-nano support column, wherein the soaking temperature is 60-90 ℃ and the soaking time is 1-2 hours;
and S2, coating polyurethane elastomer emulsion on one side of the desalting membrane coated with the dispersion liquid I, then wrapping the desalting membrane coated with the polyurethane elastomer emulsion on the outer side of the micro-nano support column, and drying to obtain the polyurethane elastomer desalting membrane.
Further, the preparation method of the polyurethane elastomer emulsion comprises the steps of dehydrating 50-90 parts by weight of polyethylene glycol at 100-120 ℃ for 60-90 min, cooling to 70-85 ℃, adding 5-50 parts by weight of diisocyanate and 0.1-1 part by weight of catalyst, reacting for 50-90 min to obtain a prepolymer, cooling to 50-60 ℃, adding 2-9 parts by weight of chain extender, 0.2-4 parts by weight of foaming agent and 0.05-2 parts by weight of foam stabilizer, extending for 100-150 min, and adding water for emulsification to obtain the aqueous polyurethane elastomer emulsion.
Further, the catalyst is dibutyl tin dilaurate, the chain extender is 1, 4-butanediol, the foaming agent is water, and the foam stabilizer is an organosilicon foam stabilizer.
Further, the concentration of the polyurethane elastomer soaking liquid is 0.2-0.5 mg/mL, and the polyurethane elastomer soaking liquid is obtained by diluting polyurethane elastomer emulsion with water.
Further, the heating temperature is 30-70 ℃.
The anti-fouling saline-alkali water desalting equipment comprises a micro-nano support column and a desalting membrane wrapped outside the micro-nano support column, wherein a polyurethane elastomer layer is arranged between the micro-nano support column and the desalting membrane, the micro-nano support column comprises a micro-nano support column matrix and a polyurethane elastomer, the micro-nano support column matrix is of a highly ordered porous structure, the polyurethane elastomer is embedded into the porous structure of the micro-nano support column matrix, the desalting membrane is of a structure with a composite pipe cavity, the pipe cavity structure of the desalting membrane is formed by compositing carbon nano tubes and silicon carbide, and the inner diameter of the pipe cavity structure is 0.4-0.5 nm.
The invention has the beneficial effects that:
According to the anti-fouling saline-alkali water desalination method, the carbon nano tubes, the silicon carbide and the like of the desalination membrane form a composite water channel, hydrated ions cannot pass through the desalination membrane, and only water and a small part of ions can pass through the desalination membrane, so that separation of water and salt is realized.
According to the anti-fouling saline-alkali water desalination method, the polyurethane elastomer layer is arranged on the desalination membrane, the polyurethane elastomer layer is of a porous structure, water can pass through the desalination membrane, the glass transition temperature of the polyurethane elastomer is low, the polyurethane elastomer has high fluidity at normal temperature, when Ca 2+、Mg2+ and organic matters in saline-alkali water are adhered to the desalination membrane or the micro-nano support column, scaling and organic matters can fall off due to the high fluidity of the polyurethane elastomer, the adhesion of Ca 2+、Mg2+ and organic matters on the desalination membrane is avoided, and the scaling resistance and the fouling resistance of the desalination membrane and the micro-nano support column are improved.
The micro-nano support column matrix prepared by the 3D printing technology is a hard framework with a highly ordered porous structure, the porous polyurethane elastomer material is embedded in the porous structure, the polyurethane elastomer material has flexibility, can shake back and forth in the water flowing process, and is used for disturbing water flow, so that salt and greasy dirt in saline-alkali water are not easy to adhere.
According to the invention, the solubility of anions and cations in the saline-alkali water is improved by heating, the quantity of hydrated ions in the saline-alkali water is improved, when the saline-alkali water passes through the pipe cavity structure, the diameter of water molecules is smaller than 4 nm, the diameter of the hydrated ions is larger and can not pass through the pipe cavity structure because of being smaller than the pipe cavity structure, and the proportion of the hydrated ions can be adjusted by heating, so that the quantity of the passed ions is adjusted, and the regulation and control of more or less salt content is realized.
Drawings
FIG. 1 is an electron micrograph of a polyurethane elastomer embedded in a micro-nano support column matrix of example 1;
FIG. 2 is a physical diagram of a micro-nano desalting column in example 1;
FIG. 3 is a physical diagram of the micro-nano desalination column of comparative example 1 after three months of use;
FIG. 4 is a physical diagram of the micro-nano desalting column of example 1 after three months of use.
Detailed Description
The invention will be further described with reference to examples of embodiments of the invention and the accompanying drawings.
PF-802 was purchased from morning company.
Example 1
The anti-fouling saline-alkali water desalination method of the embodiment 1 comprises the following steps that impurities and large particles are removed after primary precipitation of the saline-alkali water to be treated, the primary precipitated saline-alkali water is heated so as to increase the solubility of cations and anions in saline-alkali water, and fresh water is obtained after micro-nano desalination of the heated saline-alkali water. The temperature of heating was 70 ℃.
The micro-nano desalination is carried out by adopting a micro-nano desalination column, and the preparation method of the micro-nano desalination column comprises the following steps:
S1, adding sodium hydroxide into graphene oxide solution, refluxing for 3 h at 70 ℃, centrifuging, then acidizing with hydrochloric acid under reflux, centrifuging, washing with water to obtain alkali-washed graphene oxide, and dispersing gamma- (2, 3-glycidoxy) propyl trimethoxy silane of 1.2 g in a mixed solvent of 220 mL to obtain a mixed solution, wherein the mixed solvent is a mixed solvent of water and ethanol, the volume of water is 55 mL, and the volume of ethanol is 165 mL. Adding 100 mg alkaline-washed graphene oxide into the mixed solution, refluxing for 4h at 70 ℃, centrifuging to obtain a solid, washing the solid, and dispersing the solid in water to obtain a first dispersion liquid;
S2, placing silicon carbide and carbon nano tubes in ethanol and performing ultrasonic dispersion to obtain a dispersion liquid II, coating the dispersion liquid II on a polyether sulfone film, and drying to obtain a substrate film, wherein the mass fraction of the silicon carbide in the dispersion liquid II is 5wt percent, and the mass fraction of the carbon nano tubes is 4 wt percent;
s3, coating the dispersion liquid I in the S1 on the substrate film in the S2 to obtain a desalting film;
S4, carrying out 3D printing on the straws to obtain a carbon precursor, carbonizing the carbon precursor to obtain a micro-nano support column matrix, and soaking the micro-nano support column matrix in polyurethane elastomer soaking liquid for 1 h to obtain a micro-nano support column, wherein the soaking temperature is 60 ℃;
And S5, coating polyurethane elastomer emulsion on one side of the dispersion liquid I of the desalination membrane in the step S3, then wrapping the desalination membrane coated with the polyurethane elastomer emulsion on the outer side of the micro-nano support column in the step S4, and drying to obtain the micro-nano desalination column. The side coated with the polyurethane elastomer emulsion is located on the inside.
The preparation method of the polyurethane elastomer emulsion comprises the steps of dehydrating 70 kg polyethylene glycol at 120 ℃ for 60 min, then cooling to 80 ℃, adding 20 kg diisocyanate and 0.5 kg dibutyltin dilaurate, reacting 70 min to obtain a prepolymer, cooling to 60 ℃, adding 4 kg 1, 4-butanediol, 1 kg water, 0.1 kg PF-802 chain extension 150 min, adding water, and carrying out high-speed shearing emulsification. The concentration of the polyurethane elastomer soaking solution is 0.2 mg/mL, and the polyurethane elastomer soaking solution is obtained by diluting polyurethane elastomer emulsion with water.
The dirty stifled saline and alkaline water desalination equipment of embodiment 1 includes a micro-nano desalination post, and a micro-nano desalination post includes a micro-nano support column and wraps up the desalination membrane in the outside of a micro-nano support column, is provided with polyurethane elastomer layer between a micro-nano support column and the desalination membrane. The micro-nano support column comprises a micro-nano support column matrix and a polyurethane elastomer, wherein the micro-nano support column matrix has a highly ordered porous structure, the polyurethane elastomer is embedded into the porous structure of the micro-nano support column matrix, and the polyurethane elastomer coated on the desalination membrane is connected with-NH 2 on the polyurethane elastomer through epoxy groups of the desalination membrane. The desalination membrane has a structure with a composite tube cavity, the tube cavity structure of the desalination membrane is formed by compounding carbon nanotubes and silicon carbide, and the inner diameter of the tube cavity structure is 0.4-0.5 nm. The pipe cavity structure is the built composite water channel, and water molecules pass through the composite water channel.
Example 2
The anti-fouling saline-alkali water desalination method of the embodiment 2 comprises the following steps that impurities and large particles are removed after primary precipitation of the saline-alkali water to be treated, the primary precipitated saline-alkali water is heated so as to increase the solubility of cations and anions in saline-alkali water, and fresh water is obtained after micro-nano desalination of the heated saline-alkali water. The temperature of heating was 50 ℃.
The micro-nano desalination is carried out by adopting a micro-nano desalination column, and the preparation method of the micro-nano desalination column comprises the following steps:
S1, adding sodium hydroxide into graphene oxide solution, refluxing for 3 h at 70 ℃, centrifuging, then acidizing with hydrochloric acid under reflux, centrifuging, washing with water to obtain alkali-washed graphene oxide, and dispersing gamma- (2, 3-glycidoxy) propyl trimethoxy silane of 1.5 g in a mixed solvent of 300 mL to obtain a mixed solution, wherein the mixed solvent is a mixed solvent of water and ethanol, the volume of water is 80 mL, and the volume of ethanol is 220 mL. Adding 100 mg alkaline-washed graphene oxide into the mixed solution, refluxing for 4h at 60 ℃, centrifuging to obtain a solid, washing the solid, and dispersing the solid in water to obtain a first dispersion liquid;
S2, placing silicon carbide and carbon nano tubes in ethanol and performing ultrasonic dispersion to obtain a dispersion liquid II, coating the dispersion liquid II on a polyether sulfone film, and drying to obtain a substrate film, wherein the mass fraction of the silicon carbide in the dispersion liquid II is 5wt percent, and the mass fraction of the carbon nano tubes is 6wt percent;
s3, coating the dispersion liquid I in the S1 on the substrate film in the S2 to obtain a desalting film;
S4, carrying out 3D printing on the straws to obtain a carbon precursor, carbonizing the carbon precursor to obtain a micro-nano support column matrix, and soaking the micro-nano support column matrix in a polyurethane elastomer soaking solution for 2h to obtain a micro-nano support column, wherein the soaking temperature is 70 ℃;
And S5, coating polyurethane elastomer emulsion on one side of the dispersion liquid I of the desalination membrane in the step S3, then wrapping the desalination membrane coated with the polyurethane elastomer emulsion on the outer side of the micro-nano support column in the step S4, and drying to obtain the micro-nano desalination column. The side coated with the polyurethane elastomer emulsion is located on the inside.
The preparation method of the polyurethane elastomer emulsion comprises the steps of dehydrating 50 kg polyethylene glycol at 100 ℃ to 90 min, then cooling to 70 ℃, adding 15 kg diisocyanate and 0.1 kg dibutyltin dilaurate, reacting 50 min to obtain a prepolymer, cooling to 50 ℃, adding 2 kg 1, 4-butanediol, 0.2 kg water, 0.05 kg PF-802 chain extension 100 min, adding water, and carrying out high-speed shearing emulsification. The concentration of the polyurethane elastomer soaking solution is 0.3 mg/mL, and the polyurethane elastomer soaking solution is obtained by diluting polyurethane elastomer emulsion with water.
The anti-fouling saline-alkali water desalting equipment of the embodiment 2 comprises a micro-nano desalting column, and the structure of the micro-nano desalting column of the embodiment 2 is the same as that of the micro-nano desalting column of the embodiment 1. The micro-nano desalting column of the embodiment 2 is prepared by adopting the preparation method of the micro-nano desalting column of the embodiment 2.
Example 3
The anti-fouling saline-alkali water desalination method of the embodiment 3 comprises the following steps of removing impurities and large particles from the saline-alkali water to be treated after primary precipitation, heating the primary precipitated saline-alkali water so as to increase the solubility of cations and anions in saline-alkali water, and obtaining fresh water after micro-nano desalination of the heated saline-alkali water. The temperature of heating was 30 ℃.
The micro-nano desalination is carried out by adopting a micro-nano desalination column, and the preparation method of the micro-nano desalination column comprises the following steps:
S1, adding sodium hydroxide into graphene oxide solution, refluxing for 3h at 70 ℃, centrifuging, then acidizing with hydrochloric acid at reflux, centrifuging, washing with water to obtain alkali-washed graphene oxide, dispersing gamma- (2, 3-glycidoxy) propyl trimethoxy silane of 2g in a mixed solvent of 380 mL to obtain mixed solution, adding 100 mg of alkali-washed graphene oxide into the mixed solution, refluxing for 3h at 65 ℃, centrifuging to obtain solid, washing the solid, and dispersing the solid in water to obtain a first dispersion;
s2, placing silicon carbide and carbon nano tubes in ethanol and performing ultrasonic dispersion to obtain a dispersion liquid II, coating the dispersion liquid II on a polyether sulfone film, and drying to obtain a substrate film, wherein the mass fraction of the silicon carbide in the dispersion liquid II is 6wt percent, and the mass fraction of the carbon nano tubes is 6wt percent;
s3, coating the dispersion liquid I in the S1 on the substrate film in the S2 to obtain a desalting film;
S4, carrying out 3D printing on the straws to obtain a carbon precursor, carbonizing the carbon precursor to obtain a micro-nano support column matrix, and soaking the micro-nano support column matrix in polyurethane elastomer soaking liquid for 1 h to obtain a micro-nano support column, wherein the soaking temperature is 90 ℃;
And S5, coating polyurethane elastomer emulsion on one side of the dispersion liquid I of the desalination membrane in the step S3, then wrapping the desalination membrane coated with the polyurethane elastomer emulsion on the outer side of the micro-nano support column in the step S4, and drying to obtain the micro-nano desalination column. The side coated with the polyurethane elastomer emulsion is located on the inside.
The mixed solvent is a mixed solvent of water and ethanol, the volume of water is 90 mL, and the volume of ethanol is 290 mL.
The preparation method of the polyurethane elastomer emulsion comprises the steps of dehydrating polyethylene glycol of 90 kg at 110 ℃ for 70 min, then cooling to 85 ℃, adding diisocyanate of 50 kg and dibutyltin dilaurate of 1 kg, reacting 90 min to obtain prepolymer, cooling to 60 ℃, adding 1, 4-butanediol of 9 kg, water of 4 kg and PF-802 chain extension 150 min of 2 kg, adding water, and carrying out high-speed shearing emulsification. The concentration of the polyurethane elastomer soaking solution is 0.5 mg/mL, and the polyurethane elastomer soaking solution is obtained by diluting polyurethane elastomer emulsion with water.
The anti-fouling saline-alkali water desalting equipment of the embodiment 3 comprises a micro-nano desalting column, and the structure of the micro-nano desalting column of the embodiment 3 is the same as that of the micro-nano desalting column of the embodiment 1. The micro-nano desalting column of the embodiment 3 is prepared by adopting the preparation method of the micro-nano desalting column of the embodiment 3.
Comparative example 1
The anti-fouling saline-alkali water desalination method of the comparative example 1 comprises the following steps of removing impurities and large particles from the saline-alkali water to be treated after primary precipitation, heating the primary precipitated saline-alkali water so as to increase the solubility of cations and anions in saline-alkali water, and obtaining fresh water after micro-nano desalination of the heated saline-alkali water. The temperature of heating was 70 ℃.
The micro-nano desalination is carried out by adopting a micro-nano desalination column, and the preparation method of the micro-nano desalination column comprises the following steps:
s1, dispersing 100 mg graphene oxide in 220 mL water and performing ultrasonic dispersion to obtain a dispersion liquid I;
S2, placing silicon carbide and carbon nano tubes in ethanol and performing ultrasonic dispersion to obtain a dispersion liquid II, coating the dispersion liquid II on a polyether sulfone film, and drying to obtain a substrate film, wherein the mass fraction of the silicon carbide in the dispersion liquid II is 5wt percent, and the mass fraction of the carbon nano tubes is 4 wt percent;
s3, coating the dispersion liquid I in the S1 on the substrate film in the S2 to obtain a desalting film;
S4, obtaining a carbon precursor from the straws by a 3D printing technology, and carbonizing the carbon precursor to obtain a micro-nano support column;
And S5, wrapping the desalting membrane on the outer side of the micro-nano support column in the S4 to obtain the micro-nano desalting column.
Test example 1
The micro-nano desalting columns of examples 1 to 3 and the micro-nano desalting column of comparative example 1 were each tested for pure water flux (test temperature 25 ℃ C., test pressure 15 bar) and the results are shown in Table 1.
Table 1 pure water flux test results of micro-nano desalting columns of examples 1 to 3 and comparative example 1
As can be seen from table 1, the pure water flux of the micro-nano desalting columns of examples 1 to 3 is not greatly different from that of the micro-nano desalting column of comparative example 1, indicating that the polyurethane elastomer-coated micro-nano desalting columns of examples 1 to 3 do not affect the pure water flux.
After three months of use, the micro-nano desalting columns of example 1 and comparative example 1 were each tested for pure water flux (test temperature 25 ℃ C., test pressure 15 bar) and the results are shown in Table 2.
Table 2 pure water flux test results of micro-nano desalting column of example 1, comparative example 1
As can be seen from table 2, after three months of use, the micro-nano desalination column of example 1 still had a large pure water flux, while the micro-nano desalination column of comparative example 1 had a small pure water flux, because the conventional micro-nano desalination column was used for comparative example 1, both the anti-fouling ability and the anti-fouling ability were weak, ca 2+、Mg2+ fouled on the micro-nano desalination column, affecting the pure water flux of the micro-nano desalination column of comparative example 1.
Test example 2
The quality index of the brine discharged from the saline-alkali soil after the brine washing method is shown in table 3.
TABLE 3 Water quality index of saline-alkali Water (concentration unit: mg/L)
The salt-alkali water was desalted by the method and apparatus for desalting anti-fouling salt-alkali water of example 1 and comparative example 1, and the water quality index of the treated salt-alkali water is shown in Table 4.
TABLE 4 saline-alkali water treatment results (concentration unit: mg/L)
From table 4, it can be seen that the saline-alkali water treated by the method and apparatus for desalting the saline-alkali water with anti-fouling of example 1 can be directly recovered for use as domestic water. However, the micro-nano desalting column of comparative example 1 has weaker anti-scaling capability, which causes scaling of Ca 2+、Mg2+ on the micro-nano desalting column, influences the separation effect of the micro-nano desalting column, and further causes more ion content in the treated saline-alkali water.
Claims (7)
1. The anti-fouling saline-alkali water desalination method comprises the following steps of primary precipitation of saline-alkali water, heating, micro-nano desalination and water production, and is characterized in that the micro-nano desalination is carried out by adopting a micro-nano desalination column, the micro-nano desalination column comprises a micro-nano support column and a desalination membrane wrapped outside the micro-nano support column, and a polyurethane elastomer layer is arranged between the micro-nano support column and the desalination membrane;
the preparation method of the desalination membrane comprises the following steps:
S1, performing alkali washing on graphene oxide to obtain alkali washed graphene oxide, dispersing gamma- (2, 3-glycidoxy) propyl trimethoxy silane in a mixed solvent to obtain a mixed solution, adding the alkali washed graphene oxide into the mixed solution, heating and refluxing, centrifuging to obtain a solid, washing the solid, dispersing the solid in water, and performing ultrasonic dispersion to obtain a dispersion liquid I;
s2, placing silicon carbide and carbon nanotubes in ethanol and performing ultrasonic dispersion to obtain a dispersion liquid II, coating the dispersion liquid II on a polyether sulfone membrane, and drying to obtain a substrate membrane;
S3, coating the dispersion liquid I in the S1 onto the substrate film in the S2 to obtain the desalting film;
The preparation method of the desalination membrane comprises the steps of adding 1-2 g of gamma- (2, 3-glycidoxy) propyl trimethoxy silane to every 100 mg of alkaline washed graphene oxide in S1, adding 180-200 mL of mixed solvent to every g of gamma- (2, 3-glycidoxy) propyl trimethoxy silane, wherein the mixed solvent is a mixed solvent of water and ethanol, and the volume ratio of the water to the ethanol is 1:2.5-1:3.5;
The preparation method of the micro-nano desalting column comprises the following steps:
s1, preparing a micro-nano support column matrix from straws by a 3D printing technology, soaking the micro-nano support column matrix in polyurethane elastomer soaking liquid to obtain a micro-nano support column, wherein the soaking temperature is 60-90 ℃ and the soaking time is 1-2 hours;
and S2, coating polyurethane elastomer emulsion on one side of the desalting membrane coated with the dispersion liquid I, then wrapping the desalting membrane coated with the polyurethane elastomer emulsion on the outer side of the micro-nano support column, and drying to obtain the polyurethane elastomer desalting membrane.
2. The anti-fouling saline-alkali water desalination method according to claim 1, wherein the heating reflux temperature in the S1 of the desalination membrane preparation method is 60-75 ℃ and the time is 3-4 h.
3. The method for desalting the anti-fouling saline-alkali water according to claim 1, wherein the preparation method of the polyurethane elastomer emulsion is characterized in that 50-90 parts by weight of polyethylene glycol is dehydrated at 100-120 ℃ for 60-90 min, 5-50 parts by weight of diisocyanate and 0.1-1 part by weight of catalyst are added after the temperature is reduced to 70-85 ℃, prepolymer is obtained after the reaction for 50-90 min, the temperature is reduced to 50-60 ℃, 2-9 parts by weight of chain extender, 0.2-4 parts by weight of foaming agent and 0.05-2 parts by weight of foam stabilizer are added for 100-150 min, and the polyurethane elastomer emulsion is obtained after the water is added and emulsified.
4. The method for desalinating anti-fouling saline-alkali water according to claim 3, wherein the catalyst is dibutyl tin dilaurate, the chain extender is 1, 4-butanediol, the foaming agent is water, and the foam stabilizer is an organosilicon foam stabilizer.
5. The method for desalting anti-fouling saline-alkali water according to claim 3, wherein the concentration of the polyurethane elastomer soaking liquid is 0.2-0.5 mg/mL, and the polyurethane elastomer soaking liquid is obtained by diluting polyurethane elastomer emulsion with water.
6. The anti-fouling saline-alkali water desalination method according to claim 1, wherein the heating temperature is 30-70 ℃.
7. A saline-alkali water desalting device with pollution resistance and blocking resistance is characterized by comprising the micro-nano desalting column according to claim 1, wherein the micro-nano supporting column comprises a micro-nano supporting column matrix and a polyurethane elastomer, the micro-nano supporting column matrix is of a highly ordered porous structure, the polyurethane elastomer is embedded into the porous structure of the micro-nano supporting column matrix, the desalting membrane is of a structure with a composite pipe cavity, the pipe cavity of the desalting membrane is formed by compositing carbon nano tubes and silicon carbide, and the inner diameter of the pipe cavity is 0.4-0.5 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411950264.3A CN119707170B (en) | 2024-12-27 | 2024-12-27 | Anti-fouling saline-alkali water desalination method and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411950264.3A CN119707170B (en) | 2024-12-27 | 2024-12-27 | Anti-fouling saline-alkali water desalination method and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN119707170A CN119707170A (en) | 2025-03-28 |
| CN119707170B true CN119707170B (en) | 2025-08-12 |
Family
ID=95099812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411950264.3A Active CN119707170B (en) | 2024-12-27 | 2024-12-27 | Anti-fouling saline-alkali water desalination method and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119707170B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107022056A (en) * | 2017-05-12 | 2017-08-08 | 湖北大学 | A kind of redox graphene/polyurethane nano composite foam and its preparation method and application |
| AU2020102002A4 (en) * | 2019-09-19 | 2020-10-01 | Shenzhen Strong Advanced Materials Research Institute Co., Ltd | Preparation method of graphene-carbon nanotube hybrid sponge |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108264755B (en) * | 2018-04-03 | 2020-07-14 | 安徽大学 | Preparation method of graphene-carbon nanotube/waterborne polyurethane composite material |
| US20230347302A1 (en) * | 2020-05-04 | 2023-11-02 | Atom H2O, Llc | Carbon Nanotube Based Membrane and Methods of Manufacturing |
| CN116282379B (en) * | 2023-03-24 | 2024-05-31 | 浙江大学 | A method for desalination of agricultural water ions by micro-nano screening |
| CN118047621B (en) * | 2024-03-19 | 2024-08-02 | 湖南昌诺新材料有限公司 | Fiber reinforced silicon carbide composite material and preparation method thereof |
-
2024
- 2024-12-27 CN CN202411950264.3A patent/CN119707170B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107022056A (en) * | 2017-05-12 | 2017-08-08 | 湖北大学 | A kind of redox graphene/polyurethane nano composite foam and its preparation method and application |
| AU2020102002A4 (en) * | 2019-09-19 | 2020-10-01 | Shenzhen Strong Advanced Materials Research Institute Co., Ltd | Preparation method of graphene-carbon nanotube hybrid sponge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN119707170A (en) | 2025-03-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110339726B (en) | A hybrid polyethersulfone nanofiltration membrane modified by polystyrene microspheres/carbon nanotubes and its preparation method and application | |
| CN110665377B (en) | High-flux anti-pollution reverse osmosis membrane and preparation method thereof | |
| CN107376666B (en) | A kind of modified cellulose acetate film and the preparation method and application thereof | |
| CN201864630U (en) | Zero-discharge device for treating printing and dyeing wastewater | |
| CN101293196A (en) | A kind of thiol-containing water-based polyurethane adsorbent for mercury removal and preparation method thereof | |
| Liang et al. | Integrated ultrafiltration–capacitive-deionization (UCDI) for enhanced antifouling performance and synchronous removal of organic matter and salts | |
| CN105541036A (en) | Treating system and method for reusing wastewater in printing and dyeing industry | |
| CN110960987B (en) | High-performance nano hybrid reverse osmosis membrane and preparation method thereof | |
| CN107117755A (en) | A kind of high ammonia-nitrogen wastewater processing and ammonia recovery system and its method | |
| CN111672480A (en) | Crosslinked chitosan-multi-carbon nanotube composite material and application thereof | |
| CN103084077A (en) | Preparation method of polyurethane pervaporation phenol/water separating membrane compounded by inorganic particles | |
| CN113087312B (en) | Chemical wastewater treatment process based on PSF-g-CS polymer microfiltration membrane | |
| CN113171693B (en) | Chemical sewage treatment method based on polysulfone composite microfiltration membrane | |
| CN119707170B (en) | Anti-fouling saline-alkali water desalination method and equipment | |
| CN110304762B (en) | A kind of treatment method of printing and dyeing wastewater combining adsorption-flocculation-membrane separation | |
| CN110066014A (en) | A kind of Anammox fluidized bed film bioreactor device and operation method | |
| CN103570160A (en) | Device for treating high-concentration ammonia nitrogen in urine by using surfactant | |
| CN102963977B (en) | Culture raw water treatment process | |
| Chen et al. | The influence of membrane surface properties on the radionuclide mass transfer process in reverse osmosis | |
| CN110713255A (en) | Device and method for reducing pollution of plate-type ceramic membrane of anaerobic membrane bioreactor | |
| CN110876897B (en) | High-flux anti-pollution nano hybrid reverse osmosis membrane and preparation method and application thereof | |
| CN111747568A (en) | Large-scale continuous seawater salt manufacturing bittern refining system | |
| CN115557601B (en) | Biomass microspheres and preparation methods and applications thereof, bioreactors, underground wells | |
| CN108911373A (en) | A kind for the treatment of process of dyeing and printing sewage | |
| TW201731770A (en) | Water treatment device, ultrapure water manufacturing device, and water treatment method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |