1817 results about "Pervaporation membrane" patented technology

An example fluid collection assembly includes a sheath including a chamber and a fluid permeable body disposed in the chamber. The sheath includes a fluid impermeable barrier including a proximal region, a distal region, a first panel, a second panel attached to the first panel and defining an opening in the proximal region of the fluid impermeable barrier, and a fluid outlet at the distal region. The fluid permeable body includes a fluid permeable support and a fluid permeable membrane. The fluid permeable membrane includes a wicking material and is positioned such that the fluid permeable membrane is disposed to contact the penis in the chamber when the penis extends through the opening.

Embodiments described herein relate generally to electrochemical cells including a selectively permeable membrane and systems and methods for manufacturing the same. In some embodiments, the selectively permeable membrane can include a solid-state electrolyte material. In some embodiments, electrochemical cells can include a cathode disposed on a cathode current collector, an anode disposed on an anode current collector, and the selectively permeable membrane disposed therebetween. In some embodiments, the cathode and / or anode can include a slurry of an active material and a conductive material in a liquid electrolyte. In some embodiments, a catholyte can be different from an anolyte. In some embodiments, the catholyte can be optimized to improve the redox electrochemistry of the cathode and the anolyte can be optimized to improve the redox electrochemistry of the anode. In some embodiments, the selectively permeable membrane can be configured to isolate the catholyte from the anolyte.

The invention provides a zero-discharge treatment process for recycling production wastewater, and relates to the technical field of water treatment and recycling, and the zero-discharge treatment process comprises the following steps: S1, oxidizing and degrading COD through ozone and a Fenton reagent, and generating a flocculatable intermediate; s2, intercepting suspended matters by using a gradient aperture filter bed in a grading manner, and monitoring a dynamic membrane resistance coefficient delta Rm in real time to automatically trigger backwashing; s3, coupling an ultrafiltration reverse osmosis membrane to realize that the organic matter rejection rate eta is greater than or equal to 98%, and synchronously regulating and controlling flux and operation pressure by an online spectrometry; s4, regulating and controlling the current density by adopting a rotational flow electric flocculation reactor for directional crystallization to produce industrial salt with Cl <-> less than or equal to 50mg / L; and S5, based on the total dissolved solid recovery rate TR and the comprehensive energy consumption, establishing a multi-target optimization model for real-time parameter adjustment. According to the method, a membrane pollution early warning and backwashing dynamic response mechanism is constructed through cross-scale cooperative regulation and control of delta Rm and the retention rate eta, and a catalytic oxidation effect strengthening and electric crystallization parameter self-tuning technology is combined, so that the problem of cooperative optimization of high-salinity wastewater salt gradient separation and pollutant deep removal is solved.

A system is provided which includes a cannula and a secondary device. The cannula includes an expandable member, a cannula lumen, and a cannula proximal end. The expandable member includes a proximal most end, a distal most end, at least two movable sections, with the space between the at least two moveable sections, and an impermeable membrane extending across the space between each of the at least two moveable sections. In addition, the impermeable membrane extends from the expandable member distal most end to the expandable member proximal most end. The secondary device is configured to be coaxially placed through the cannula lumen. The cannula proximal end is configured to operatively couple to a vacuum source configured to create a negative pressure to pull an undesirable material into the cannula lumen.

The invention belongs to the technical field of pervaporation membrane preparation and application, and relates to a covalent organic framework pervaporation hybrid membrane with a combination sequence regulation interlayer structure, in particular to preparation of the pervaporation membrane and application of the pervaporation membrane in water / butanol separation. Adding the aldehyde monomer solution into the amino monomer solution, and standing for reaction; taking a water phase, and carrying out dialysis treatment; diluting the covalent organic framework nanosheet dispersion liquid to obtain dispersion liquid A; adjusting the pH of a polyelectrolyte aqueous solution to obtain a solution B; adjusting the pH value of the metal ion dispersion liquid to obtain a solution C; uniformly mixing the dispersion liquid A and the solution C at normal temperature, adding the solution B, and heating for reaction to obtain a membrane casting liquid; and carrying out suction filtration on the membrane casting solution to a base membrane, and carrying out vacuum drying to obtain the pervaporation membrane. At 70 DEG C, the separation flux of a 10wt% / 90wt% water / butanol mixture is 7.52 g / (m < 2 > h), and the separation factor reaches 13709.

The invention discloses a graphdiyne multilayer composite membrane and a preparation method thereof, and belongs to the technical field of membrane separation. A porous base membrane with an alkynyl layer is obtained by adopting a two-step modification method, then the porous base membrane is soaked in a solution containing a graphdiyne monomer and a catalyst, and a reaction is performed at a certain temperature, so that a graphdiyne material fully grows on the surface of the porous base membrane. Adding a membrane casting solution formed by mixing an organic polymer, a cross-linking agent, a catalyst and an organic solvent to the surface of the graphdiyne-loaded porous base membrane, volatilizing the organic solvent, and curing at 80 DEG C to form the membrane. The ethanol permselective membrane has a three-layer membrane structure, namely the organic polymer layer, the ultrathin graphdiyne transition layer and the porous support layer, so that the problems of agglomeration and pore permeation of a nano material are effectively avoided, and the adsorption process of ethanol is further enhanced. The membrane prepared by the invention has higher pervaporation alcohol permeation performance, can efficiently and stably recover alcohols, and provides reference for the development of a novel pervaporation membrane structure with preferential alcohol permeation.

The invention discloses a preparation method of a reverse osmosis membrane and the reverse osmosis membrane. The preparation method comprises the following steps: (1) adding polyethersulfone into N, N-dimethylacetamide in a heating and stirring state, and stirring for a period of time after charging is completed, so as to obtain a mixed solution; (2) cooling the mixed solution, continuing to add a pore-foaming agent, and stirring for a period of time after charging is completed to obtain a precursor solution; (3) performing vacuum defoaming treatment on the precursor solution to obtain a membrane casting solution; (4) loading the membrane casting solution on a carrier, and then carrying out gel bath treatment to obtain a base membrane; and (5) performing polyamide treatment on the surface of the base membrane to obtain the reverse osmosis membrane. The preparation method disclosed by the invention is simple in process and low in material cost, and the obtained reverse osmosis membrane has more uniform and more through-type pore structures, higher separation efficiency, more excellent chemical stability and better mechanical properties, can adapt to higher operation pressure, and can continuously and stably operate at higher flux under high pressure.

The invention relates to a preparation method for improving a sodium alginate pervaporation membrane by using a two-dimensional leaf-shaped zeolite imidazole framework (ZIF-L) material, and particularly relates to a preparation method for improving a sodium alginate pervaporation membrane by using a two-dimensional leaf-shaped zeolite imidazole framework (ZIF-L) material. The pervaporation mixed matrix membrane comprises a base membrane and a separation layer membrane, the base membrane adopts a polyacrylonitrile (PAN) membrane, and the separation layer is composed of ZIF-L and sodium alginate. According to the invention, the distribution of ZIF-L in the membrane is improved, directional arrangement is formed, and the separation effect and selectivity of the composite membrane are improved. A novel process is adopted, the defect problem of the ZIF-L-SA membrane is eliminated, the continuous ultrathin ZIF-L membrane is prepared through a secondary seed growth method, and the performance of the two-dimensional ZIF-L membrane is improved. The ZIF-L synthesis conditions are mild, the method is simple, hydrophilic modification of the membrane surface is achieved, an internal water molecule transmission channel is constructed, and the separation factor and stability of the membrane are improved. The prepared high-flux pervaporation membrane has a wide application prospect.

The invention discloses a preparation method and application of a ternary multifunctional three-dimensional framework mediated high ammonia nitrogen selectivity polyamide reverse osmosis membrane, and belongs to the technical field of membrane separation. The method comprises the following steps: 1, preparing a high-molecular copolymer; 2, preparing a polysulfone support layer by adopting a non-solvent induced phase inversion method; 3, preparing a polyamide reverse osmosis membrane by adopting an interfacial polymerization method; and 4, preparing the polyamide reverse osmosis membrane with high ammonia nitrogen selectivity. Through reasonable design of the structure and distribution of the group of the ternary multifunctional three-dimensional structure high-molecular copolymer, the copolymer can react with the acyl chloride group on the surface of the polyamide active layer to form a covalent amido bond, and the covalent amido bond is anchored on the surface of the polyamide layer in situ to construct the functional layer. The functional layer not only can significantly improve the surface potential of the membrane, but also can increase the inherent concentration of ammonia nitrogen on the surface of the membrane, thereby increasing the diffusion resistance, finally realizing the repulsive force to the ammonia nitrogen, and improving the interception capability of the grafted membrane to the ammonia nitrogen. The operation process is simple and mild, the whole membrane preparation process is not changed, and industrialization is easy.

Embodiments disclosed herein are directed to fluid collection assemblies including a fluid impermeable barrier having a sump and a base. An example fluid collection assembly includes a fluid impermeable barrier. The fluid impermeable barrier includes a sump and a base. For example, the sump may protrude outwardly from the base. The sump defines an opening and a chamber. The fluid collection assembly may include at least one porous material disposed in the chamber that at least partially covers the opening, such as a fluid permeable membrane extending across at least a portion of the opening and a support disposed in the chamber. The fluid collection assembly may also include an adhesive layer disposed on the base that is configured to secure the rest of the fluid collection assembly to at least a portion of a pubic region of an individual. Further, the fluid collection assembly may include a fluid outlet.

The invention discloses an energy-saving and consumption-reducing method for a reverse osmosis membrane system, which belongs to the technical field of water treatment and comprises the following steps: step 1, acquiring various parameter data of the reverse osmosis membrane system in real time; 2, establishing an energy consumption prediction mathematical model of the reverse osmosis membrane system; 3, inputting the real-time parameter data into the energy consumption prediction mathematical model, and judging whether the operation power of the high-pressure pump is reasonable or not according to an output result; 4, when the operation power is not reasonable, the operation power of the high-pressure pump is adjusted in real time; and 5, establishing a membrane pollution concentration early warning model, and carrying out alarm response. According to the method, comprehensive analysis can be carried out in real time according to various parameters of inflow water quality to accurately predict the predicted power, so that whether the set operation power of the high-pressure pump is reasonable or not is judged, the operation power of the high-pressure pump can be dynamically adjusted, the output of energy consumption can be reduced as much as possible under the condition that treatment is qualified, and the operation efficiency of the high-pressure pump is improved. And the cost is saved.

The invention discloses a method for purifying disilane, which comprises the following steps: A, filtration and adsorption treatment: mixed gas is sequentially introduced into at least one stage of filter and at least one stage of adsorber to remove solid impurities, the filter is selected from a porous ceramic filter, and the adsorber is selected from an activated carbon adsorber; b, primary rectification: introducing the filtered and adsorbed mixed gas into a heavy component removal tower for primary rectification to remove heavy component impurities, wherein the heavy component impurities are selected from gas impurities of which the molecular weight is greater than that of disilane; c, membrane separation: introducing the mixed gas subjected to primary rectification into a membrane separator, and enabling the mixed gas to pass through an organic polymer reverse osmosis membrane made of an inert material; and D, secondary rectification: introducing the mixed gas subjected to membrane separation treatment into a light component removal tower, and carrying out secondary rectification to remove monosilane. The method disclosed by the invention is simple to operate and few in working procedures, and is beneficial to quickly realizing high-quality separation and purification of disilane.

The invention relates to the technical field of water treatment, in particular to a high-recovery-rate short-process salt-tolerant reverse osmosis system and treatment method.The system comprises a pretreatment unit, a sensor monitoring unit, a self-adaptive pressure-flow coupling control unit, an intelligent operation and maintenance unit and a gradient boosting reverse osmosis membrane set. According to the invention, ultrahigh recovery rate and desalination performance are realized, gradient boost membrane module design is combined with concentration polarization inhibition technology, membrane surface flow state distribution is optimized, osmotic pressure influence is significantly reduced, pressure-flow coupling control and concentrated water excess pressure energy recovery technology are integrated, energy dynamic cyclic utilization is realized, energy consumption is reduced, and the method is suitable for industrial production. By monitoring the membrane flux attenuation rate and the transmembrane pressure difference in real time and dynamically optimizing a pulse cleaning strategy, dynamic optimization of high-salinity wastewater treatment is realized, and the problems of low recovery rate, high energy consumption and quick membrane pollution in high-salinity wastewater treatment are solved.

The invention relates to the technical field of reverse osmosis membranes, in particular to a polyamide reverse osmosis membrane for high-salinity wastewater treatment and a preparation method of the polyamide reverse osmosis membrane. The invention solves the problem that the polyamide reverse osmosis membrane cannot give consideration to both desalination rate and water flux. The polyamide reverse osmosis membrane comprises a polyester non-woven fabric layer, a polysulfone porous layer, a transition layer and a polyamide layer. The polysulfone porous layer is prepared, and the modified pore-forming agent is added to improve the water flux of the reverse osmosis membrane; the hydrophilicity of the reverse osmosis membrane is improved by preparing the transition layer and adding a hydrophilic auxiliary agent when the polyamide layer is prepared; the flux attenuation rate of the polyamide reverse osmosis membrane is reduced by preparing the polyamide layer; the desalination rate of the reverse osmosis membrane is improved by introducing a composite ion complexing agent and graphene quantum dots into the polyamide layer.

The invention relates to the technical field of membrane separation, in particular to an optical isomerization metal organic framework interlayer forward osmosis membrane and a preparation method thereof. The preparation method of the photo-isomerization metal organic framework interlayer forward osmosis membrane comprises the following steps: loading a UiO-67-SP nano material dispersion liquid on the surface of a nylon support layer under a light source irradiation condition or a dark condition to form a composite interlayer; under a light source irradiation condition or a dark condition, adding an amine monomer aqueous phase solution and an acyl chloride organic phase solution to the surface of the composite intermediate layer, so that an amine monomer in the amine monomer aqueous phase solution and an acyl chloride monomer in the acyl chloride organic phase solution are subjected to an interfacial polymerization reaction and a separation layer is formed; the spiropyrane / zirconium-based photo-isomerization metal organic framework intermediate layer forward osmosis membrane is obtained. According to the prepared forward osmosis membrane, the water flux and the salt ion interception effect are remarkably improved, namely, the reverse salt flux is reduced, and the problems that an existing forward osmosis membrane is poor in water permeability and ion recovery performance due to the fact that a separation layer is too thick and non-selective holes exist can be solved.

The invention relates to the technical field of seawater desalination, in particular to a seawater desalination reverse osmosis membrane, a preparation method and application. The seawater desalination reverse osmosis membrane is prepared by the preparation method. The preparation method comprises the following steps: immersing the prepared support layer into a water phase solution, and then taking out the support layer adsorbing the water phase solution; immersing the support layer adsorbing the water phase solution into a first oil phase solution, and forming a primary reverse osmosis membrane through a first interfacial polymerization reaction; then, taking out the primary reverse osmosis membrane, and carrying out first drying treatment under a steam condition; and immersing the primary reverse osmosis membrane into a second oil phase solution, and carrying out a second interfacial polymerization reaction to form the seawater desalination reverse osmosis membrane. The application refers to the application of the reverse osmosis membrane for seawater desalination in the aspects of reclaimed water reuse, seawater desalination and brackish water desalination. According to the invention, the seawater desalination reverse osmosis membrane which simultaneously meets high desalination rate and high water flux can be prepared.

The invention relates to the technical field of reverse osmosis (RO) membranes, in particular to a ro membrane filter element for a water purifier. A ro membrane filter element for a water purifier is a polyethersulfone membrane with a hydrophilic modifier-polydopamine coating deposited on the surface, and the hydrophilic modifier is one or more of polyethylene glycol, hexanehexol and 3-sulfopropyl tetradecyl dimethyl betaine. The ro membrane filter element for the water purifier disclosed by the invention has extremely high anti-pollution performance.

The invention relates to the technical field of reverse osmosis membrane assembly cleaning, and particularly discloses a cleaning method of a reverse osmosis membrane. The cleaning method of the reverse osmosis membrane comprises the following steps: (1) washing the reverse osmosis membrane with product water of a reverse osmosis membrane system until concentrated water in the membrane is fully replaced with the product water; (2) immersing the cleaned reverse osmosis membrane into an acidic cleaning solution, and controlling the pH value to be 2-2.5; (3) washing the reverse osmosis membrane with product water of a reverse osmosis membrane system until concentrated water in the membrane is fully replaced with the product water; (4) immersing the cleaned reverse osmosis membrane into an alkaline cleaning solution, and controlling the pH value to be 11.5-12; and (5) repeating the steps (1)-(4), and flushing the reverse osmosis membrane with the product water of the reverse osmosis membrane system until the concentrated water in the membrane is fully replaced with the product water. The prepared reverse osmosis membrane has good cleaning efficiency, the permeation flux and the desalination rate of the reverse osmosis membrane are recovered, and the service life of the reverse osmosis membrane is prolonged.

The invention discloses a preparation method of a TA modified aminated ZIF-90 polyamide reverse osmosis membrane, which comprises the following steps: by taking a self-made polysulfone membrane as a base membrane, firstly soaking the base membrane in a water phase solution, then soaking the base membrane in an oil phase solution containing aminated ZIF-90, then treating the base membrane with a tannic acid (TA) / ethanol solution, and finally performing heat treatment to obtain the target polyamide reverse osmosis membrane. Aminated ZIF-90 is used for modifying a polyamide membrane, then TA is used for modifying a surface layer, and compared with an original membrane, the prepared membrane material is effectively improved in water flux and salt interception; after chlorine treatment, the attenuation rate of water flux and salt interception is smaller than that of the original membrane, which indicates that the chlorine resistance of the modified polyamide membrane is superior to that of the original membrane; meanwhile, the modified polyamide membrane has excellent anti-pollution performance.

According to the method for preparing the polyamide / sulfonated COFs reverse osmosis membrane through in-situ copolymerization, a polysulfone ultrafiltration membrane is used as a supporting layer, a water-phase monomer solution and an organic-phase monomer solution are subjected to a one-step in-situ copolymerization reaction on a water-phase / organic interface on the supporting layer, and the polyamide / sulfonated COFs reverse osmosis membrane is prepared. The preparation method is simple in technological process and low in cost, the sulfonated COFs material is introduced into a polyamide layer through one-step interface in-situ copolymerization, the dispersity and compatibility of the sulfonated COFs can be well enhanced, the interface polymerization process is regulated and controlled by fully utilizing a porous structure, hydrophilicity and indirect control of monomer diffusion, and the like, and the preparation method is suitable for large-scale industrial production. The trade-off effect of a traditional polyamide reverse osmosis membrane is broken through, the salt rejection rate is increased while high water flux is guaranteed, and the polyamide reverse osmosis membrane has very high practical application value.

The invention relates to the technical field of water purifiers, and provides a water purifier control method, device and equipment and a storage medium, and the method comprises the following steps: when an instruction of starting water production is received, obtaining any random number from a preset random number range; if the random number is within a preset first range, firstly filtering tap water flowing in from a main water inlet through a first reverse osmosis membrane, then enabling wastewater output by the first reverse osmosis membrane to flow into a second reverse osmosis membrane for secondary filtration, and then enabling the wastewater to flow out from a main water outlet; if the random number is within a preset second range, firstly filtering the tap water flowing in from the main water inlet through a second reverse osmosis membrane, then enabling the wastewater output by the second reverse osmosis membrane to flow into the first reverse osmosis membrane for secondary filtration, and then enabling the wastewater to flow out from the main water outlet. According to the invention, the first reverse osmosis membrane or the second reverse osmosis membrane can be prevented from being invalid in advance due to overuse, so that the service life of each osmosis membrane in the reverse osmosis filter piece is prolonged.

The invention belongs to the field of separation membranes, and particularly relates to a preparation method of a reverse osmosis membrane. Comprising the following steps: a) coating a water phase solution containing multifunctional amine on the surface of a supporting layer of a base membrane, then coating an oil phase solution containing multifunctional acyl halide, and drying to form a polyamide separation layer on the surface of the supporting layer to obtain a nascent state membrane; b) soaking the nascent state membrane in an alkaline solution with the pH value of 9-12, and then rinsing to obtain a semi-finished membrane; c) coating a post-treatment solution containing polyvinyl alcohol, polydimethylsiloxane and an amino silane coupling agent on the surface of the polyamide separation layer of the semi-finished product membrane, and drying; d, the membrane treated in the step c is soaked in a 3-chloro-2-hydroxypropyl trimethyl ammonium chloride aqueous solution for quaternization reaction and dried, and the reverse osmosis membrane is obtained.The reverse osmosis membrane prepared through the method has good permeability, hydrophilicity, pollution resistance, antibacterial property and washing resistance.

A system suitable for collecting and transporting urine away from the body of a person or animal may include an assembly having a fluid impermeable casing having a fluid reservoir at a first end, a fluid outlet at a second end, and a longitudinally extending fluid impermeable layer coupled to the fluid reservoir and the fluid outlet and defining a longitudinally elongated opening between the reservoir and the outlet. The assembly can further include a fluid permeable support disposed within the casing with a portion extending across the elongated opening, and a fluid permeable membrane disposed on the support and covering at least the portion of the support that extends across the elongated opening, so that the membrane is supported on the support and disposed across the elongated opening. The assembly can further include a tube having a first end disposed in the reservoir and a second, fluid discharge end.

The invention relates to the technical field of water treatment, in particular to a reverse osmosis membrane and a preparation method thereof. The preparation method of the reverse osmosis membrane comprises the following steps: soaking a base membrane in a water phase solution, taking out the base membrane, drying the surface of the base membrane, coating the base membrane with an oil phase solution, carrying out interfacial polymerization reaction, curing, coating with a modifier solution, and drying to obtain the reverse osmosis membrane, the modifying agent comprises 2, 4, 6-tri (4-aminophenyl)-1, 3, 5-triazine-1, 3, 5-tri (4-methyl phenyl) benzene. The successfully grafted COFs can improve the water permeability of the membrane to a certain extent, and also can improve the pollution resistance, acid resistance and oxidation resistance of the membrane, so that the service life of the membrane is prolonged. According to the invention, different effects of the same type of imino COFs introduced to the reverse osmosis membrane are further compared, so that the excellence of the selected imino COFs is highlighted.

The present invention relates to the field of water treatment technology, and more particularly to a kind of reverse osmosis membrane and preparation method thereof.The preparation method of the reverse osmosis membrane includes:Basement membrane is soaked in aqueous phase solution, after taking out surface drying, oil phase solution is coated on basement membrane and carries out interfacial polymerization reaction, after solidification, coating modifier solution, after drying, obtain reverse osmosis membrane;The modifier includes 2,4,6-tris (4-aminophenyl) ‑1,3,5-triazine ‑1,3,5-tris (4-methylphenyl) benzene.The COFs successfully grafted by the present invention can improve the water permeability of membrane to a certain extent, and can also improve the anti-pollution property, acid resistance and oxidation resistance of membrane, and then improve the service life of membrane.The present invention further compares the different effects that the same type of imino COFs are introduced into reverse osmosis membrane, so as to highlight the excellence of the imino COFs selected by the present invention.

The invention relates to the technical field of water treatment, and provides a reverse osmosis membrane cleaning method, a cleaning agent composition and application. According to the method, whether cleaning is needed or not is determined by comparing initial operation parameters and current operation parameters of a system; the pollutant type is accurately judged by observing the appearance characteristics of the membrane surface and detecting related index parameters; and selecting a corresponding cleaning agent formula according to the pollutant type, and sequentially performing physical washing and chemical cleaning. The cleaning agent composition comprises a biological pollution cleaning agent, an organic pollution cleaning agent and / or an inorganic scaling cleaning agent. By establishing a scientific pollution diagnosis system and a targeted cleaning strategy, the problems of fixed cleaning scheme and low pertinence in the prior art are solved, the pressure difference recovery rate after cleaning can reach 90% or above, the desalination rate recovery rate can reach 99% or above, the cleaning efficiency is remarkably improved, the operation cost is reduced, and the service life of the membrane is prolonged.

The invention relates to the technical field of membrane separation and seawater desalination, in particular to a high-boron-removal-rate reverse osmosis membrane and a preparation method and application thereof. The polyamide reverse osmosis membrane with at least 70% nodular areas on the surface is prepared by introducing the ethylenediamine tetraacetic acid metal salt into the water phase solution as a complexing additive, and the boron removal rate of the membrane can be improved on the basis of ensuring the retention rate and flux of the membrane.

The invention relates to the technical field of membrane separation, in particular to a composite forward osmosis membrane based on mussel bionic interface enhancement and a preparation method thereof. The preparation method comprises the following steps: immersing a base material in a dopamine hydrochloride solution for oscillation reaction to obtain a modified base material; the surface of the modified base material is coated with a membrane casting solution in a blade coating mode, then phase inversion is carried out, the residual solvent is removed, then airing is carried out, and the composite forward osmosis membrane based on mussel bionic interface enhancement is obtained. By introducing the mussel bionic polydopamine intermediate layer, the long-standing technical contradictions of poor interfacial compatibility and weak binding force between the hydrophobic substrate and the hydrophilic separation layer are ingeniously solved, and the internal concentration polarization effect is remarkably inhibited. The prepared composite membrane has the advantages of high water flux, low salt reverse flux, stable structure and the like, and has wide application prospects in the fields of water treatment and substance separation.

The invention provides a reverse osmosis membrane cleaning system which is characterized in that a variable-frequency water pump control system is adopted to adjust water flow momentum according to cleaning parameters output by a matching algorithm, differential impact strength control of different areas on the surface of a membrane is realized through a flow adjusting valve group, and a stress distribution mode adaptive to pollution distribution is obtained; mechanical stress data of the membrane surface in the cleaning process are collected in real time through a membrane material stress monitoring sensor, if the stress value exceeds a membrane material safety threshold value, a stress protection mechanism is triggered, and the impact strength of a corresponding area is automatically reduced; establishing an adaptive parameter optimization algorithm according to pressure feedback data and a pollutant stripping effect evaluation result in the cleaning process, and calculating a parameter adjustment scheme of the next cleaning period through a tradeoff function of the cleaning effect and mechanical damage; a membrane performance degradation prediction model is established through accumulation of historical cleaning data, the remaining service life of a membrane material is predicted according to accumulated mechanical stress and cleaning frequency data, and a quantitative judgment basis of the membrane replacement opportunity is obtained.

The invention belongs to the field of membrane pollution control, and particularly relates to a modification method for prolonging the service life and performance of a pervaporation membrane in seawater. According to the method, the pervaporation membrane is soaked in deionized water for treatment, so that anticorrosive substances on the surface of the membrane are stripped, the soaked pervaporation membrane is pasted in a membrane assembly, then the membrane assembly is soaked in a tannic acid solution for 60 s, and after soaking is finished, the membrane assembly is taken out. The membrane assembly is taken out, the surface of the membrane is washed with deionized water and then moved into a ferric chloride solution to be soaked for 60 s, finally, the surface of the membrane is washed with deionized water, so that the polyphenol coating is successfully attached to the surface of the membrane, and the unique property of the polyphenol coating becomes the key for prolonging the service life of the membrane; when the PH is lower than 3, most-OH groups in the tannic acid are protonated, so that the polyphenol coating is disintegrated and separated from the pervaporation membrane, and pollutants accumulated on the surface of the membrane are removed at the same time. And subsequently. The surface of the pervaporation membrane is coated with a new polyphenol coating again, so that the service life of the pervaporation membrane is prolonged, and the method also has important significance in reducing the treatment cost of desalinated seawater.