Patents
Literature
Patsnap Copilot is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Patsnap Copilot

1098 results about "UF - Ultrafiltration" patented technology

Ultrafiltration (UF) is a variety of membrane filtration in which forces like pressure or concentration gradients lead to a separation through a semipermeable membrane.

Zero-emission integrated process for treatment and reuse of high-salinity wastewater

The invention discloses a zero-emission integrated process for treatment and reuse of high-salinity wastewater. The invention relates to a softening desalination treatment technology of water and particularly relates to a reuse treatment system for reverse osmosis concentrated water containing low-concentration organic matters which can achieve the requirement of 'zero emission'. The integrated process comprises the following steps: (1) firstly softening and pre-treating the high-salinity wastewater; (2) acquiring pre-treated water by virtue of activated carbon adsorption and an ultrafiltration device; (3) acquiring nanofiltration softened water and nanofiltration concentrated water by virtue of a nanofiltration device; (4) acquiring reverse osmosis softened water and reverse osmosis concentrated water by virtue of a reverse osmosis device; (5) acquiring electrodialysis softened water and electrodialysis concentrated water by virtue of an electrodialysis device; and (6) carrying out evaporation crystallization treatment on the electrodialysis concentrated water by virtue of an evaporation-crystallization device, regularly outwards transporting salts generated by the evaporation crystallization, feeding generated salt into a water-producing tank to enter a reuse system and finally completing the treatment and reuse of high-salinity wastewater. The integrated process is mainly used for the integrated treatment of the high-salinity wastewater.
Owner:XINJIANG DELAND

High-water-flux forward-osmosis composite membrane and preparation method thereof

The invention relates to a high-water-flux forward-osmosis composite membrane and a preparation method thereof. The forward-osmosis composite membrane is a polysulfone-sulfonated polysulfone-inorganic filler blended/polyamide composite membrane. A traditional osmosis membrane is generally applied to a reverse-osmosis system, and if the traditional osmosis membrane is used in a forward-osmosis process, the water flux of osmosis is far lower than a theoretical value since the traditional osmosis composite membrane is large in thickness, the hydrophilicity of a supporting layer of a polyamide layer is poor so as to cause serious inner concentration polarization. The preparation method comprises the following steps: blending a polymer with a modifier to form film casting liquid; after scraping or leveling, performing non-solvent coagulating bath with water; by a phase-inversion method, preparing a polysulfone ultrafiltration membrane with good hydrophilicity, high porosity, uniform surface pore structure and narrow pore diameter distribution; and in a clean environment and at room temperature, airing the polysulfone membrane till the surface is dry, and growing a polyamide active layer on the surface of the polysulfone membrane by an interfacial polymerization method, thereby obtaining the forward-osmosis composite membrane with good hydrophilicity, high porosity, low thickness and high mechanical strength. The high-water-flux forward-osmosis composite membrane disclosed by the invention has the advantages that not only the osmosis flux is high, but also the reverse leakage of an extraction medium is low, and the selective permeability is good.
Owner:UNIV OF SCI & TECH OF CHINA

Intensified deep concentration system for high-salt-content industrial wastewater and technology thereof

The invention discloses an intensified deep concentration system for high-salt-content industrial wastewater and a technology thereof and belongs to the field of water treatment. The high-salt-content industrial wastewater is adjusted through an adjusting tank, settled through a softening settling pond, filtered through a V-type filter tank, filtered through an ultrafiltration device in an intensified mode and concentrated through a first-stage reverse osmosis device, then the hardness is removed through an ion exchange resin device, and salt separation is performed through a nanofiltration device; thick water of the nanofiltration device is concentrated through a frequent electrode transfer electrodialysis device, produced water is oxidized through an advanced oxidization device and then enters a general produced water tank, and thick water is crystallized through a freezing crystallization system and crystallized with sodium sulfate; produced water of the nanofiltration device is concentrated through a second-stage reverse osmosis device and concentrated again through the frequent electrode transfer electrodialysis device, produced water is oxidized through the advanced oxidization device and enters the general produced water tank, and thick water is crystallized through an MVR evaporative crystallization device and crystallized with sodium chloride. The intensified deep concentration system has the advantages that potential safety hazards caused by high-pressure operation are effectively reduced; the problem that the COD content is high after thick salt water is highly concentrated is effectively solved, the purity of crystallized salt is improved, and the using value of the crystallized salt is improved; the system is high in automation degree, easy to operate, low in operation pressure, stable in operation, high in purity of the crystallized salt, low in operation cost and the like.
Owner:INNER MONGOLIA JIUKE KANGRUI ENVIRONMENTAL TECH

Method for cleaning ultrafiltration membrane

The invention provides a method for cleaning an ultrafiltration membrane, which comprises a physical cleaning method and a chemical cleaning method. The physical cleaning method comprises a process of air scrubbing of ultrafiltration membrane components and a process of backwashing of the ultrafiltration membrane components. The process of air scrubbing of the ultrafiltration membrane comprises the following steps: ultrafiltration membrane components discharges concentrated water when compressed air is introduced, wherein the air inlet pressure of the ultrafiltration membrane components is less than 2.5 bar and more than 1.5 bar, compressed air is introduced for 1 minute, sewage in the ultrafiltration membrane components is exhausted after air scrubbing is completed, backwashing for once is carried out according to the backwashing process of the ultrafiltration membrane components. The chemical cleaning method comprises the following steps: carrying out forward cleaning circulation ofthe ultrafiltration membrane components; preparing an alkaline cleaner, carrying out forward cleaning circulation of the ultrafiltration membrane components; immersing the ultrafiltration membrane components. The method for cleaning the ultrafiltration membrane is capable of eliminating the pollution of the ultrafiltration membrane components, recovering the performance of the ultrafiltration membrane components, ensuring the normal operation of the ultrafiltration membrane components and prolonging the usage life of the ultrafiltration membrane components as long as possible.
Owner:SHANXI TAIGANG STAINLESS STEEL CO LTD

Seawater desalting method

The invention belongs to the technical field of desalting of seawater, and relates to a seawater desalting method. The seawater desalting method comprises the following steps of: charging filtering water which is obtained by the pretreatment of seawater into a heat exchanger of a heat discharge section of a seawater desalting system for condensing the steam and recovering the heat energy of the heat discharge section to obtain the heat-exchanged warm seawater with higher temperature; transporting the warm seawater into an ultrafiltration device by a low-pressure pump, transporting the ultrafiltration produced water into a nanofiltration device by a high-pressure device, selectively removing the scaled ions in seawater to obtain nanofiltration softened water, and inputting into a reverse osmosis device through the high-pressure pump to obtain reverse osmosis produced water and reverse osmosis concentrated water; recovering the energy of the reverse osmosis concentrated water to be directly taken as the charged water of a heat recovering section of an MED (multi effect distillation) device or an MSF (multi stage flash) device; mixing the desalting produced water and the reverse osmosis produced water through the MED device or the MSF device to be taken as drinking water; and recovering the energy of nanofiltration concentrated water, and mixing with the concentrated water to be discharged or comprehensively utilized. The method is simple in technology, low in energy consumption, high in desalting efficiency, good in effect, simple in device structure, reliable in principle, stable in production process, and environment-friendly.
Owner:OCEAN UNIV OF CHINA

Preparation method of high-performance PVDF composite ultrafiltration membrane with surface loaded with TiO2 thin membrane

A preparation method of a high-performance PVDF composite ultrafiltration membrane with the surface loaded with a TiO2 thin membrane is provided. The invention is used for solving the problems of complex process, high membrane preparing cost, and difficult industrialized production existing in a conventional method for improving membrane hydrophilicity so as to improve membrane flux, anti-fouling performance and the like. The preparation method comprises the steps: 1, preparing a PVDF polymer membrane casting solution, and preparing an ultrafiltration basement membrane by an immersion-precipitation method; 2, preparing an auxiliary agent solution; 3, soaking the basement membrane in the auxiliary agent solution, taking out and swashing with water, and soaking in deionized water; 4, preparing a titania precursor solution; 5, immersing the basement membrane in the titania precursor solution, hydrolyzing a precursor, taking out and swashing with water, and thereby obtaining the high-performance ultrafiltration membrane with the surface firmly loaded with the TiO2 thin membrane. The method of the invention has the advantages of simple operation and low cost; and the obtained ultrafiltration membrane has large permeation flux, high rejection rate, strong hydrophilicity and outstanding anti-fouling performance. The preparation method is used for the membrane processing field.
Owner:HARBIN INST OF TECH

Preparation method of nanoscale zirconium phosphate silver-carrying composite inorganic antimicrobial agent

The invention discloses a preparation method of a nanoscale zirconium phosphate silver-carrying composite inorganic antimicrobial agent. The preparation method comprises the following steps of 1, a nanoscale zirconium phosphate carrier preparation step specifically comprising that enough sodium dihydrogen phosphate aqueous solution is added into zirconium oxychloride aqueous solution to undergo areaction to produce nanoscale zirconium phosphate carriers, 2, an ultrafiltration step specifically comprising that the nanoscale zirconium phosphate carriers obtained from the step 1 are added into an ultrafilter membrane system for ultrafiltration and when a result of a detection adopting silver ions shows that there is not chloride ions in filtrate, the ultrafiltration is completed, 3, an antimicrobial metal ion adsorption and displacement step specifically comprising that nanoscale zirconium phosphate carrier sol precipitates are dissolved in pure water and then antimicrobial metal ion aqueous solution is added into the nanoscale zirconium phosphate carrier sol precipitate aqueous solution to undergo complete adsorption and displacement reactions, and 4, an inorganic antimicrobial powder preparation step specifically comprising that reaction products obtained from the step 3 are filtered by a pump and washed to form filter cakes and the filter cakes is dried by an oven, crushed slightly and calcined to form finished products. The preparation method removes an inorganic salt by-product from a zirconium phosphate synthesis process through adopting an ultrafilter membrane thus enables zirconium phosphate carriers to be utilized directly for adsorption and displacement of metal ions without high-temperature calcination.
Owner:SANDA FILM SCI & TECH XIAMEN

Preparation method for improved polyvinylidene fluoride-based nanofiltration film

The invention provides a preparation method for an improved polyvinylidene fluoride-based nanofiltration film, belonging to the technical field of films. The preparation method comprises the followingsteps: preparation of a polyvinylidene fluoride ultrafiltration base film by using a phase inversion process: mixing polyvinylidene fluoride, a solvent, an additive, a pore forming agent, and a compound having an amino, carboxyl, sulfonic acid, or hydroxyl function group, successively carrying out heating to 50-90 DEG C, uniform mixing under stirring and standing for deaeration in a vacuum environment so as to obtain a film casting solution, and then carrying out film scraping with a scraping knife and soaking in a coagulation bath for film formation or allowing the film casting solution to flow out from a spinneret to the coagulation bath for film formation so as to obtain the polyvinylidene fluoride ultrafiltration base film; and preparation of the polyvinylidene fluoride-based nanofiltration film by using an interfacial polymerization process: successively coating the surface of the polyvinylidene fluoride ultrafiltration base film with an aqueous solution of a water-phase monomerand an organic solution of an oil-phase monomer by using a quantitative injection process and then carrying out heat treatment so as to obtain the polyvinylidene fluoride-based nanofiltration film. The prepared the polyvinylidene fluoride-based nanofiltration film is stable and more cost-effective, and can avoid environmental pollution.
Owner:BEIJING E & E TECH

External anaerobic membrane bioreactor and waste water purification technology thereof

The invention provides an external anaerobic membrane bioreactor comprising an anaerobic tank, a tubular membrane component, tubular ultrafiltration membrane elements and a clear water tank, wherein the tubular ultrafiltration membrane elements are vertically arranged in parallel in the tubular membrane component. The invention also provides a corresponding waste water purification technology of the external anaerobic membrane bioreactor. The waste water purification technology includes the steps as follows: firstly conducting purification treatment on waste water to be treated in the anaerobic tank, collecting biogas which is generated after treatment, filtering and separating the treated waste water in sequence by a fine grating and the tubular ultrafiltration membrane elements, at last leading out the leached clear water, backwashing and chemically washing the tubular ultrafiltration membrane elements at time intervals, drip-washing the collected biogas, and then pumping the biogas together with sewage into the tubular ultrafiltration membrane elements, so that the washing effect of the inner walls of the tubular ultrafiltration membrane elements can be improved. As for the external anaerobic membrane bioreactor and the waste water purification technology thereof, the energy consumption in operation is low, the quality of effluent is good, and blockage does not happen easily.
Owner:上海膜达克环保工程有限公司

Water supply and drainage system of livestock and poultry farms

The invention relates to a livestock and poultry farm water supply and drainage system, which is designed for water resource recycling of the scale livestock and poultry farm. The system consists of five parts including a cooling device, a rain water harvesting device, a medicine spraying device and a sewage disposal system. The design of the system is mainly characterized in that the system adopts well water or rain water for cooling the livestock and poultry houses, the cooling sewage and the rain water are colleted to rain water pools through rain water grooves, and the rain water or tap water is processed by a ultrafiltration membrane water processor to provide drinking water for the houses. The tap water or the rain water processed by the ultrafiltration membrane water processor is used for diluting the liquid medicine and the well water or the rain water is used for washing the livestock and poultry houses; the methane and the biogas slurry generated after the biological treatment of the house-washing sewage is used for fertilizing after being biologically treated. The water supply and drainage system is characterized in reasonable design, water conservation, water resource recycling, ecological virtuous circle and low production cost, which is applicable to the modernized management of the scale livestock and poultry farm water supply and drainage facility.
Owner:奕永庆 +2

Cleaning method of ultrafiltration membrane

The invention discloses a cleaning method of an ultrafiltration membrane. The cleaning method is used for mainly treating the pollution form of the ultrafiltration membrane with inorganic scales coated with organic scales. The method comprises the following steps: (1) preparing an acid cleaning solution; (2) carrying out acid pickling: carrying out circulating cleaning on the ultrafiltration membrane by using the acid cleaning solution, controlling the pH value of the cleaning solution to be 1.5-3 and controlling the cleaning temperature to be 38-41 DEG C; (3) carrying out primary flushing and removing residual acid cleaning solution in the ultrafiltration membrane; (4) preparing an alkaline cleaning solution; (5) carrying out alkaline washing: carrying out circulating cleaning on the ultrafiltration membrane by using the alkaline cleaning solution, controlling the pH value of the cleaning solution to be 10.5-11.5 and controlling the cleaning temperature to be 38-41 DEG C; and (6) carrying out secondary flushing and removing the residual alkaline cleaning solution in the ultrafiltration membrane. According to the method, various organic matters intercepted on ultrafiltration membrane pores can be efficiently removed, the water yield of the ultrafiltration membrane is increased, the operation pressure of the ultrafiltration membrane is reduced and stable operation of a landfill leachate ultrafiltration membrane treatment system is ensured.
Owner:HUNAN JUNXIN ENVIRONMENTAL PROTECTION CO LTD

Method for preparing nanofiber-based composite filter membrane by hot-pressing incipient fusion method

The invention relates to a method for preparing a nanofiber-based composite filter membrane by a hot-pressing incipient fusion method. The method comprises the following steps: preparing a spinning solution from functional macromolecules to carry out electrostatic spinning and using an obtained nanofiber non-woven fabric as a supporting layer of the composite filter membrane; preparing a solution from another functional macromolecules and spraying the solution to the surface of a base membrane of the non-woven fabric by an electrostatic spraying method to form a barrier layer of the composite membrane; carrying out processing on the barrier layer of the composite membrane by adopting the hot-pressing incipient fusion method which gives suitable temperature, pressure and hot-pressing time so as to obtain the complete barrier layer; finally, carrying out post processing on the barrier layer to obtain the required nanofiber-based separation composite membrane. The method for preparing the composite filter membrane, which is provided by the invention and is simple and easy to operate, can conveniently and accurately control the thickness and uniformity of the functional barrier layer and is easy to implement scale production; the obtained nanofiber-base composite membrane has a wide prospect in the fields of ultrafiltration, nanofiltration, reverse osmosis and the like.
Owner:DONGHUA UNIV

Preparation method of anti-pollution composite nanofiltration membrane

The invention provides a preparation method of an anti-pollution composite nanofiltration membrane. The preparation method includes subjecting a polysulfone ultrafiltration membrane to primary interfacial polymerization by a first aqueous phase solution and an oil phase solution, pouring a second aqueous phase solution containing nonionic hydrophilic polymers onto the surface of the ultrafiltration membrane to conduct secondary interfacial polymerization, removing the second aqueous phase solution, conducting heat treatment, and taking out the membrane for washing to obtain the composite nanofiltration membrane. The preparation method has the advantages that the nonionic hydrophilic polymers containing ether bonds in main chains are embedded in a polyamide layer through the secondary interfacial polymerization, the surface of the modified membrane is smooth, and the surface roughness is lowered; through introduction of nonionic hydrophilic groups, the number of residual carboxyl groupson the surface can be remarkably decreased, pollutant adsorption and salt bridge effect can be effectively reduced, and the anti-pollution performance of the nanofiltration membrane is improved; theoperation process is simple and convenient, and the preparation method is convenient for industrial production and has a broad application prospect in anti-pollution modification of the composite nanofiltration membrane.
Owner:WANHUA CHEM GRP CO LTD +1

Method for advanced treatment and reuse of wastewater

The invention provides a method for advanced treatment and reuse of wastewater. The method is characterized in that a biochemical device adopting a biological aerated filter comprises a water inlet pipe, a backwashing water inlet pipe, a backwashing air inlet pipe, an aerator pipe, a backwashing drain pipe, a water outlet pipe, water distributors, supporting fillers, ceramic fillers, a cell body and a filter plate, wherein energy consumption is only 60% of that of a contact oxidation method after secondary wastewater is subjected to biochemical treatment in the biological aerated filter and organic pollutants are removed; a separation device of an ultrafiltration pressing film comprises a biological aerated filter water discharging tank, a lift pump, a safety filter, ultrafiltration films, an ultrafiltration water production pipe and an ultrafiltration concentrated water pipe, wherein the ultrafiltration films can be used for intercepting matters with molecular weights of 3*10000-1*10000 and removing most colloidal silicon and organic matters in the water; and an electric-absorption desalting device comprises an ultrafiltration device water discharging tank, a water supply pump, a filtering device, an electro-adsorption module, a water production pipe, a reuse water tank, a regenerative pump and a regenerative water outlet, wherein raw water lifted by the regenerative pump is flushed by a short-circuited and standing module so as to regenerate an electrode, and a pollution discharge process is a backwashing process of the module.
Owner:XINJIANG ENVIRONMENTAL ENG TECH

Recovery method for aroma components in production process for instant tea powder

The invention discloses a recovery method for aroma components in a production process for instant tea powder. The recovery method comprises the following steps: crushing tea into coarse powder by using a pulverizer, mixing the obtained tea powder with water and extracting aroma components in the tea; filtering tea soup obtained after extraction by using a multilayer plate and frame type filter press; subjecting a filtrate obtained after plate and frame type filtration to ultrafiltration so as to obtain a clear filtrate and subjecting the filtrate to vacuum concentration; subjecting a concentrate obtained after concentration to spray drying so as to obtain the tea powder, wherein solid content of the concentrate is 40 to 50 wt%; and with condensed water generated in the process of vacuum concentration as a material liquid for pervaporation, carrying out pervaporation membrane separation and subjecting concentrated aromatic substances in the tea to spray drying to recover the aromatic substances to the tea powder. According to invention, most aromatic substances in the tea can be recovered, the quality of the tea powder is improved, and the utilization rate of the tea is increased; compared with a traditional extractive distillation method and the like, the recovery method for the aroma components in the tea through pervaporation membrane separation has the advantages of high separability, low energy consumption, a mild operation temperature, no additive, etc.
Owner:NANJING UNIV OF TECH

Carboxyl-side-group-containing polyarylether copolymers and preparation method thereof, and application of copolymers in aspect of ultrafiltration membrane hydrophilic modification

The invention relates to carboxyl-side-group-containing polyarylether copolymers and a preparation method thereof, and application of the copolymers in the aspect of ultrafiltration membrane hydrophilic modification, belonging to the technical field of ultrafiltration membrane preparation. By adopting nucleophilic polycondensation and one-step feeding, the mole ratio of the phenolphthalin bisphenol monomer to the total bisphenol monomer is changed to prepare a series of polyarylether copolymers with different carboxylation degrees; and the polyarylether copolymers are used as the membrane material preparation membrane casting solution to prepare a series of ultrafiltration membranes by an impregnation precipitated-phase conversion process. The hydrophilicity and water flux of the carboxyl-side-group-containing modified polyarylether ultrafiltration membranes are obviously enhanced. The modified monomer phenolphthalin can be obtained only by hydrolyzing/reducing phenolphthalein, so the experimental operation is simple, and the raw material price is low. In addition, the technique has the advantages of enduring chemical hydrophilic modification, high repetitiveness and the like, and is easy to operate.
Owner:JILIN UNIV

Multilayer composite ultrafiltration membrane and preparation method thereof

The invention discloses a multilayer composite ultrafiltration membrane and a preparation method thereof. The multilayer composite ultrafiltration membrane is characterized by being provided with five layers of structures, wherein each of the inner and outer surfaces of the ultrafiltration membrane is a PET or PP non-woven fabric base body, each of the inner and outer subsurfaces of the ultrafiltration membrane is a polymer nanofiber membrane layer, and the middle layer of the ultrafiltration membrane is a cellulose nanofiber membrane layer. A polymer in the polymer nanofiber membrane layer is selected from one of polyether sulfone, polysulfone, polyacrylonitrile and polyvinylidene fluoride film forming polymers, and then is processed to prepare a spinning solution, and electrostatic spinning dope forms the polymer nanofiber membrane layers on PET or PP non-woven fabrics serving as the base bodies for electrostatic spinning collection. The cellulose nanofiber membrane layers are prepared by selecting one of bamboo, wood, cotton and linen, dissociating fiber slurry and processing. The multilayer composite ultrafiltration membrane prepared by the method has good hydrophily, higher pollutant resistance and water flux, and better interception characteristic, and is more economical in use and longer in service life.
Owner:上海展恒环保科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products