3709results about "Ultrafiltration" patented technology

The invention provides a virus-removing ultrafiltration membrane and a preparation method thereof, and belongs to the technical field of membrane separation. According to the preparation method of the ultrafiltration membrane, a hydrophilic polymer and a bulk polymer are blended to prepare a membrane casting solution, the ultrafiltration membrane is prepared on the basis of a double-layer homogeneous compounding method and a phase inversion method, and the obtained integrated ultrafiltration membrane comprises a separation layer with a compact skin layer and a pre-filtration supporting layer with a complete sponge structure, and provides high mechanical strength and toughness at the same time; the separation layer and the supporting layer form a hourglass-shaped structure with effective aperture continuously changing in a gradient mode, and no obvious interface or layering phenomenon exists. The ultra-filtration membrane is clear in gradient structure, the upper surface is loose, the lower surface is compact, the structures are fused more tightly, no obvious interface exists, the filtration resistance is reduced, and the protein permeability is improved. And the flux and the maximum treatment volume are improved and the treatment time is shortened while the relatively high virus rejection rate and the relatively low protein adsorption capacity are maintained.

The present disclosure discloses an integrated rapid treatment system for nuclear medical radioactive wastewater and an application method thereof. This system includes a wastewater collection unit; a pretreatment unit; a deep purification unit; a solid decay unit; a buffer unit; an online monitoring unit; and a control unit, wherein the online monitoring unit includes a radioactivity level detection module for detecting total α and total β radioactivity concentrations of inlet and outlet water of a medium in each unit, and a real-time monitoring module for treatment process parameters. The present disclosure discloses an integrated rapid treatment system for nuclear medical radioactive wastewater and an application method thereof, which can efficiently and quickly purify multi-nuclide organic low-level wastewater produced by a nuclear medical process, and realize rapid online monitoring and automatic control at the same time.

The invention provides a process for preparing various nutritional ingredients from oats, and relates to the technical field of deep processing of oats. The process comprises the following steps: crushing and sieving oats to obtain oat bran; the method comprises the following steps: extracting oat bran through a supercritical extraction technology to obtain pretreated oat bran and an extract, and carrying out gradient membrane treatment and membrane ultrafiltration on the extract to obtain oat oil; extracting the pretreated oat bran through continuous sectional extraction equipment; after first-stage protein extraction, second-stage dextran extraction, third-stage immobilized enzymolysis and fourth-stage filler decoloration, the materials enter a system balance tank, and membrane separation and concentration are performed to obtain the oat beta-dextran. According to the invention, various nutrient substances such as oat beta-glucan, oat protein, oat oil and the like can be extracted at the same time, the defects in the prior art are overcome, the automation degree is high, and energy conservation and emission reduction are realized.

The invention discloses a purification device for aquaculture wastewater, and relates to the technical field of wastewater purification. Comprising a box body as well as a physical filter tank and a biochemical bacterium culture tank which are arranged in the box body, and further comprises a microfiltration assembly arranged in the physical filter tank, the microfiltration assembly comprises a filter cartridge rotationally connected to the interior of the physical filter tank, a backwashing pipe is fixedly connected to the interior of the physical filter tank, and a sewage collecting tank is arranged in the filter cartridge; a cleaning assembly matched with backwashing to improve the cleaning effect of the filter cartridge is arranged in the filter cartridge, the cleaning assembly comprises a floating plate arranged in the filter cartridge, a connecting rod slidably penetrates through the floating plate, and the upper end of the connecting rod penetrates through the dirt collecting tank and is fixedly connected with a first cleaning brush; stubborn attachments such as mycoderm and caustic soda attached to the inner wall of the filter cartridge can be brushed off by utilizing the first cleaning brush, and the cleaning effect on the filter cartridge can be improved by matching with backwashing, so that the attachments on the inner wall of the filter cartridge can be massively washed off, the backwashing period is shortened, and the blockage probability of the filter cartridge is reduced.

The invention discloses a desalting membrane as well as a preparation method and application thereof, and relates to the technical field of membrane separation. The desalting membrane comprises a porous ultrafiltration base membrane and a functional layer formed on the surface of the porous ultrafiltration base membrane; the functional layer is formed by copolymerizing and cross-linking a polyamine monomer, a zwitterionic multi-element hydroxyl monomer and an acyl chloride monomer through an interfacial polymerization reaction. The preparation method comprises the following steps: providing the porous ultrafiltration base membrane; coating the surface of the porous ultrafiltration base membrane with an alkaline water-phase solution containing a polyamine monomer and a zwitterionic multi-hydroxyl monomer to form a water-phase solution layer; coating an oil-phase solution containing an acyl chloride monomer on the surface of the water-phase solution layer to form a functional layer; and performing heat treatment. The invention also provides application of the desalination membrane in any one of seawater desalination, brackish water desalination, wastewater treatment and material separation and concentration. According to the invention, zwitter-ion-based multi-hydroxyl monomers are introduced into water-phase monomers to participate in interfacial polymerization, and a super-hydrophilic nano-channel is constructed in a separation layer, so that the water flux and the desalination rate of the membrane are remarkably improved.

Disclosed herein is a catalytic comprising a hexacyano metal compound; wherein the hexacyano metal compound comprises a metal selected from the group consisting of cobalt, iron, copper, manganese, nickel, zinc, and combinations thereof; wherein the hexacyano metal compound comprises coordinatively unsaturated metal (II)—N—C centers for; and wherein the hexacyano metal compound is anchored onto an inorganic substrate. Also disclosed are a system including the catalytic material and a process for treating wastewater using the catalytic material.

To shorten the time required for capturing when capturing fine particles for detection of the fine particles in liquid, or the like.SOLUTION: A method for capturing fine particles in liquid includes: a concentration step in which the liquid is passed through a first filtration membrane 11 in a first direction, and fine particles 61 are accumulated on the surface of the first filtration membrane 11; and a recovery step in which, after the concentration step, separation liquid is passed through the first filtration membrane 11 in a second direction being the reverse direction to the first direction, the separation liquid that has passed through the first filtration membrane 11 is then passed through a second filtration membrane 21 different from the first filtration membrane 11, the fine particles 61 are separated from the first filtration membrane 11 and captured on the surface of the second filtration membrane 21.SELECTED DRAWING: Figure 1

The utility model discloses a white spirit upgrading ultrafiltration device, and particularly relates to the technical field of white spirit production equipment, the white spirit upgrading ultrafiltration device comprises a filter bin, the middle part of the filter bin extends to the lower end and is symmetrically provided with residue discharge grooves, the output ends of the residue discharge grooves are connected with sealing blocks in a sliding manner, and a motor is fixedly connected below the inner cavity of the filter bin; a transmission structure is fixedly connected to the outer surface of the output end of the motor, a knocking structure is fixedly connected to the right side of the upper portion of the transmission structure, a sweeping structure is fixedly connected to the upper portion of an inner cavity of the filtering bin, and an ultrafiltration membrane is rotationally connected to the middle of the inner cavity of the filtering bin. According to the Baijiu upgrading ultrafiltration device disclosed by the utility model, the ultrafiltration membrane is matched with the sweeping structure and the residue discharge groove, so that impurities and suspended matters filtered by the ultrafiltration membrane can be swept and fed into the residue discharge groove in time, the Baijiu filtering quality is improved, the sweeping structure does not influence the Baijiu filtering in the filtering process, and the filtering speed is also improved; and due to automatic cleaning, the manual labor is reduced.

The invention discloses a preparation method and device of a low molecular weight cutoff ultrafiltration membrane, and belongs to the technical field of ultrafiltration membrane preparation. A thermally induced phase separation method and a non-solvent induced phase separation method are combined to prepare the membrane, the relationship between the flux and the retention rate of the ultrafiltration membrane is balanced, high flux is considered while high retention of low-molecular-weight substances is provided, an upper-layer membrane casting solution and a lower-layer membrane casting solution are used for double-layer simultaneous coating, a substrate is coated with the membrane casting solutions, and the membrane is obtained through a dry process section. Phase separation is carried out after entering a coagulating bath, a finished membrane is obtained through cleaning, the obtained membrane is of an integrated structure, the coagulating bath used in the membrane casting process is pure water, and recycling and aftertreatment of the ultrafiltration membrane are facilitated.

The invention relates to a carbon and nitrogen dual-recovery method and device for collecting grease and phycocyanin in an algae-bacterium symbiotic sewage treatment system, and the method comprises the following steps: 1, carrying out mud-water separation on phycomycete suspension taken out from the sewage treatment system to obtain phycomycete biomass precipitate; 2, extracting grease in the precipitate in the first step by adopting a chloroform-methanol solution, and collecting the grease to recover carbon; and step 3, adding a hydrochloric acid solution into the biomass extracted in the step 2, heating and stirring, and collecting phycocyanin in supernate to recover nitrogen. According to the method disclosed by the invention, the mode of firstly collecting the grease to extract the carbon and then collecting the phycocyanin to extract the nitrogen is adopted, so that grease loss caused in the process of collecting the phycocyanin is avoided, the collection rate of the grease is improved, and dual recovery of the carbon and the nitrogen can be realized.

An apparatus and a method are provided for a mobile reservoir system to provide potable water to desired destinations. The mobile reservoir system includes a waterborne vessel that includes a cargo hold. A collection unit comprised of a material for safe and sterile storage of potable water is disposed in the cargo hold. One or more collectors channel rainwater into the collection unit. Each collector is a sheet of a non-porous material supported on a retractable frame and a plurality of support arms. The sheet provides a surface area for collecting rainwater. A porous material covers the collection unit and operates as a filter for collected rainwater. A retractable cover may be extended over the cargo hold to provide protection to the collected rainwater in the collection unit. A filtration system is configured to offload the rainwater as potable water.

The invention provides a hydrophilic modified polyethersulfone hollow fiber ultrafiltration membrane and a preparation method thereof, and the preparation method comprises the following steps: preparing a polyethersulfone hollow fiber ultrafiltration membrane: mixing sultone, aluminum chloride or tin chloride according to a set mass ratio to obtain a sultone stock solution; the method comprises the following steps: soaking a polyethersulfone hollow fiber ultrafiltration membrane in a sultone stock solution for a set time period, adding RO water to prepare a sultone solution, soaking for the set time period, transferring to an acid environment for cleaning, transferring the cleaned polyethersulfone hollow fiber ultrafiltration membrane to an alkaline environment for cleaning, and drying to obtain the polyethersulfone hollow fiber ultrafiltration membrane. Taking out the cleaned polyethersulfone hollow fiber ultrafiltration membrane, sequentially soaking the polyethersulfone hollow fiber ultrafiltration membrane with reverse osmosis water and a glycerol solution, and airing to obtain the hydrophilic modified polyethersulfone hollow fiber ultrafiltration membrane. The hydrophilic modified polyethersulfone hollow fiber ultrafiltration membrane which is high in hydrophilicity and uniform in sulfonation is obtained through sulfonation post-treatment of the polyethersulfone hollow fiber ultrafiltration membrane.

The present disclosure relates to embodiments of a method for manufacturing a ceramic material comprising the steps of (a) homogenizing aluminum oxide, niobium pentoxide and solvent; (b) ultrasonicating the blend obtained in step (a); (c) adding an aliquot of the prepared suspension to the empty cavity of a mold, particularly between the polymeric mold and the metal mold; (d) immersing the mold into a coolant liquid-containing bath for sufficient time to ensure that all parts are completely frozen; (e) removing the ceramic body from the mold; (f) removing the solidified phase by means of sublimation hence obtaining a green tube; and (g) sintering the green tube, so as to obtain a solid structure. The present disclosure further relates to embodiments of a ceramic material and its use to manufacture a microfiltration membrane and / or a membrane support for fluid separation.

The present invention relates to a modular and scalable system for intelligent vertical farming infrastructure, using the latest in water recycling sciences, and artificial-intelligence based automation. This helps to combat the issue of sustainable Agriculture+its minimizing usage of water, energy, and space. It combines a vertical farming structure with multiple levels of cultivation with an irrigation and drainage system to achieve recirculation of water. The water recycling unit consists of rainwater harvesting, wastewater collection and multi-stage treatment subsystems, which can guarantee a continuous supply of high-quality recycled water for irrigation. The invention also combines a network of Internet of Things (IoT)-enabled sensors and AI-based control circuitry to track and manage environmental conditions (e.g. light intensity, humidity, temperature, and nutrient levels).

Method and apparatus for treating greywater to produce process water, comprising a cleaning process including coarse filtration of the greywater, preferably aerobic biological cleaning with sedimentation of particles and suspended solids, and subsequent ultrafiltration, preferably by means of a membrane filter, wherein the cleaning process is controlled at least with regard to the biological cleaning and the ultrafiltration depending on the greywater pollution.

The invention belongs to the technical field of water treatment, and particularly relates to tank-type ultrafiltration equipment, which comprises an ultrafiltration equipment shell, the hollow pipe is rotationally connected to the inner wall of the ultrafiltration equipment shell through a bearing; the connecting shaft drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the hollow pipe to rotate, the hollow pipe drives the sealing plate to rotate, the sealing plate drives the ultrafiltration membrane and the scraper to rotate, the ultrafiltration membrane is soft in texture, in the rotating process, the ultrafiltration membrane is impacted by water, dirt falls off, and the function of cleaning the ultrafiltration membrane is achieved. The membrane treatment capacity of the ultrafiltration membrane is improved, the service life of the ultrafiltration membrane is prolonged, and the scraper is in contact with the shell of the ultrafiltration equipment to remove dirt on the shell of the ultrafiltration equipment; the second gear rotates to drive the third gear to rotate, the third gear drives the reciprocating lead screw to rotate, the reciprocating lead screw drives the blocking plate to reciprocate, the blocking plate discontinuously leaves the liquid storage box, the cleaning agent in the liquid storage box flows out, the ultrafiltration membrane is cleaned in cooperation with stirring, and the cleaning effect of the ultrafiltration membrane is improved.

The invention provides a preparation method of a composite double-layer microporous membrane, and belongs to the technical field of separation membrane preparation, different lower-layer and upper-layer membrane casting solutions are prepared respectively, the separation membrane is prepared at one time by adopting a double-scraper casting and coating method, the upper layer is thermally induced phase separation, and the lower layer is thermally induced phase separation or non-solvent induced phase separation; the double-layer liquid membrane is subjected to pre-phase splitting and pore opening in a constant-temperature and constant-humidity environment, and enters a gel bath at a certain temperature after pre-phase splitting, and a microporous membrane with a certain membrane structure is formed under the action of RTIPS and NIPS. According to the invention, a co-coating method is adopted, and VIPS, RTIPS and NIPS are used for adjusting the pore structure of the membrane, so that the microporous membrane meeting different filtering requirements is prepared; the prepared membrane product is high in flux and high in yield; the preparation process is simple and conditions are mild: the microporous membrane prepared by the method is simple in process, mild in conditions and suitable for industrial production; and the membrane structures of the upper and lower membranes can be freely adjusted.

A disposable filter capsule for a filtration device including only one housing, which has an inflow connection for a fluid to be filtered and an outflow connection for filtrate. The disposable filter capsule also includes at least two separate filters which are fixed in the housing and together with the housing form an inseparable structural unit. All the components of the disposable filter capsule consist of sterilizable, in particular gamma-sterilizable, materials.

Described herein are systems, devices, and methods for filtering a fluid. The fluid may include or may be suspected to include a particle. The systems may include a filtration housing and a filter at least partially compressed within the housing. Compression of the filter set by the housing may result in a gradation of effective pore sizes of the filter, allowing for particles of various sizes to be captured within the filter. The compression may additionally increase an effective surface area of the filter and allow for multidirectional flow of the fluid through the filter. The methods for use and manufacture of the filtration systems and devices may include arranging the filter within the housing such that at least a portion of the filter is compressed within the housing and a desired effective pore size of the filter is achieved.

A fluid filtration system includes a fluid storage vessel such as a bioreactor, a filter housing including a filter element disposed therein, a pump coupled between the fluid storage vessel and the filter housing, and a flow diverter disposed between the pump and the filter housing. The pump is configured to move fluid from the fluid storage vessel through the filter element, and the flow diverter is configured for selectively directing fluid received from the pump to the first or second end of the filter housing. In a first mode of operation, the flow diverter directs flow through the filter housing in a first direction, while in a second mode of operation, the flow diverter directs flow through the filter housing in a second direction opposite the first direction.

A perfusion bioprocessing system (10) includes a bioreactor (12) and a recirculation flow path (14) provided with at least in one first feed flow control device (46) and at least one second feed control device (48). The perfusion bioprocessing system (10) further includes a first tangential flow filter (16) coupled to the bioreactor (12) via the recirculation flow path (14) and a second tangential flow filter (18) coupled to the bioreactor (12) via the recirculation flow path (14). The first tangential flow filter and the second tangential flow filter are coupled to a permeate flow path and a retentate flow path. Additionally, the perfusion bioprocessing system (10) includes a control unit (90) coupled to the at least one first feed flow control device (38) and the at least one second feed control device (40).

The utility model discloses an automatic cleaning purifier and relates to the technical field of purifiers. The purifier with the automatic cleaning function comprises a purifier base, a filter bottle is arranged at the top of the purifier base, a mounting mechanism is arranged at the top of the filter bottle, and a filtering mechanism is arranged in the filter bottle. According to the purifier with the automatic cleaning function, by arranging the connecting rod main body, when membrane filaments need to be cleaned, firstly, the output end of the motor main body is controlled by the control panel to drive the connecting rod main body fixedly installed on the motor main body to rapidly rotate forwards and backwards, and at the moment, a fixing rod fixed to the top of the connecting rod main body through a fixing head, a filter element head and the membrane filaments rapidly rotate forwards and backwards; the multiple scattered membrane filaments are arranged so that mutual friction force can be generated when the membrane filaments are scattered and rotate in the cleaning process, wrapping objects on the surface can be rubbed off through the friction force, the cleanliness during rotary cleaning is improved, and the membrane filaments can be conveniently cleaned through the device.

To prevent degradation or breakage of an ultrafiltration membrane caused by steam disinfection treatment.SOLUTION: A water treatment device 1 comprises a plurality of ultrafiltration membrane devices 10, 20 each having at least one ultrafiltration membrane module 11-13, 21-23, and steam introduction means L20 that introduces steam in parallel to the plurality of ultrafiltration membrane devices 10, 20.SELECTED DRAWING: Figure 1

The direct drinking water system comprises a pretreatment device, a membrane treatment device, a finished product water tank, a cleaning device, a water supply branch and a water return branch, the cleaning device comprises a concentrated water tank, a gas-liquid mixing branch, a bypass pipeline, a pulse water supply branch, a cleaning main pipe, a forward washing branch, a backwashing branch and a lower opening sewage branch. According to the utility model, quick switching in the cleaning process of the hollow fiber membrane is realized, the highest and lowest pressurization values in each period are accurately controlled, and meanwhile, adverse effects on membrane water production caused by water production of a water hammer and an air hammer are avoided; the pulse type positive and back washing is combined, so that the membrane pollutants are removed more thoroughly; according to the device, ozone microbubbles of a cleaning medium are exploded, so that the pollutant removal capacity is also improved; and when the filtered water in the finished water tank is stored for a long time, the ozone aeration device can also be used for sterilizing the filtered water, so that the application range of the device is expanded, and the safety of direct drinking water is guaranteed.

The invention discloses a furan distillation and purification device for tetrahydrofuran raw materials, which comprises a distillation box, a preheating channel, a distillate flow guide assembly and a multi-stage filter assembly, and the multi-stage filter assembly comprises a first ultrafiltration membrane treatment mechanism, a second ion exchange resin treatment mechanism and a third molecular sieve treatment mechanism. The upper part of the feeding end of the distillation box is connected with a preheating channel, and inner inclined plates are arranged at the bottom of the distillation box and below the preheating channel. According to the furan distillation and purification device for the tetrahydrofuran raw material, when an existing furan distillation and purification device is used for treating a furan solution, although part of impurities can be removed, the purification effect is not thorough, and impurity residues still exist; meanwhile, the device is high in energy consumption in the distillation and extraction process and needs to depend on the combined use of a plurality of devices, so that the operation complexity is increased, the large loss is caused in the material conveying process, and the overall purification efficiency and the product quality are influenced.

The present disclosure is directed to methods and systems of purifying solvents. The purified solvents can be used for cleaning a semiconductor substrate in a multistep semiconductor manufacturing process.

The present invention discloses a separation membrane based on a reactive support layer, a preparation method and an application, and belongs to the technical field of water treatment membranes. The preparation method includes: (1) subjecting a porous support membrane to an amino grafting reaction to prepare a reactive support membrane; and (2) subjecting an aqueous phase solution and an oil phase solution containing a multi-membered acyl chloride oil phase monomer to interfacial polymerization on the reactive support membrane to prepare a separation membrane based on a reactive support layer; where an aqueous phase monomer in the aqueous phase solution is a semi-aromatic amine or an aromatic amine. In the present invention, the porous support membrane is subjected to the amino grafting reaction to obtain the reactive support membrane, and the interface polymerization is carried out on a surface of the reactive support membrane. Due to the reactive support membrane, a structure of a formed polyamide separation layer can be changed, thereby improving the water permeability of a polyamide separation membrane and maintaining an ion retention property or the ion selectivity thereof. The method of the present invention has the advantages of a simple process, low requirements for equipment and convenience in industrial production, and the prepared high-performance separation membrane has a wide application prospect in the field of water treatment.

The invention relates to the technical field of sewage filtering, in particular to an ultrafiltration membrane sewage filtering device which comprises a shell unit and a filtering unit. Wherein the shell unit comprises a shell body, an upper cover and a lower cover, the two ends of the shell body are open, the upper cover and the lower cover are arranged at the two ends of the shell body respectively, the upper cover is communicated with a purified water outlet pipe, and the shell body is communicated with a flushing pipe. According to the invention, the cleaning process is carried out by stages from low-flow-speed water flow flushing to cleaning ring brushing driven by the axial flow blades, to deformation and flushing of the ultrafiltration membrane filaments through up-down movement of the outer shell, and finally, the deformed and diffused ultrafiltration membrane filaments are flushed in combination with the water flow; by means of the series of steps, it is guaranteed that the ultrafiltration membrane filaments can be comprehensively and deeply cleaned, water flow with high flow speed and high water pressure is prevented from being used in the whole cleaning process, possible damage to the ultrafiltration membrane filaments is effectively prevented, and the service life of the ultrafiltration membrane is prolonged.

Provided is a water treatment device which has fewer constituent elements than in the prior art, can reduce the time required for installation, and can save space. A water treatment device provided with one or more units comprising: a hollow fiber membrane module group (110) comprising three or more and ten or less hollow fiber membrane modules (100) each comprising a hollow fiber membrane bundle comprising a plurality of hollow fiber membranes; a pipe group (120) comprising a raw water feed pipe (121) connected to the hollow fiber membrane module (100) via a raw water inlet, a filtrate collection pipe (122) connected to the hollow fiber membrane module (100) via a filtrate outlet, and a discharged water recovery pipe (123) connected to the hollow fiber membrane module (100) via a cleaning outlet; and a support member group (130) comprising support members (131, 132) for supporting the hollow fiber membrane module (100), the raw water delivery pipe (121), the filtered water collection pipe (122), and the discharged water collection pipe (123), in which the mass per unit membrane area of the hollow fiber membrane is 1.0 kg / m2 or less.

The invention belongs to the technical field of filtering membrane materials, and particularly relates to a polymer membrane material as well as a preparation method and application thereof. The polymer film material provided by the invention is prepared from the following preparation raw materials in percentage by mass: 10 to 18 percent of film-forming polymer, 0.1 to 22 percent of alkenyl monomer, 0.1 to 3 percent of initiator, 0.1 to 22 percent of coupling agent and 35 to 89.7 percent of organic solvent, the alkenyl monomer comprises an alkenyl hydrophilic monomer and an alkenyl siloxy monomer. The polymer formed by the alkenyl monomer through in-situ polymerization is physically wound with the film-forming polymer, so that the hydrophilicity and pollution resistance of the polymer film material are improved; the coupling agent is pre-embedded in a membrane casting solution to serve as a subsequent reaction anchor point, the coupling agent can serve as a uniformly-distributed network node to be quickly coupled and crosslinked through chemical action in the phase separation curing process, and a hydrophilic modifier easy to segregate and dissolve out is locked in the polymer membrane by taking covalent acting force as internal driving force for inhibiting segregation, so that the stability is improved.