94 results about "Cross-flow filtration" patented technology

The invention provides a continuous process for preparing aromatic hydrocarbon by supercritical carbon dioxide hydrogenation, which comprises the following steps: 1) adding a reaction liquid containing a solvent and a catalyst into a reaction kettle, spraying supercritical carbon dioxide and hydrogen into a reactor by adopting a Venturi ejector, and contacting with the catalyst in the reaction kettle to react; (2) after the reaction in the step (1), the gas in the reactor is sequentially subjected to primary condensation and secondary condensation to respectively condense the solvent and the water, the solvent of the primary condensation returns to the reaction kettle, the water of the secondary condensation is discharged, and the gas after the secondary condensation sequentially passes through an absorption tower and a desorption tower to capture non-aromatic hydrocarbon, the residual gas is used as recycle gas and returns to the Venturi ejector to enter the reaction kettle; and (3) pressurizing the reaction liquid discharged from the reaction kettle after the reaction in the step (1) through a circulating pump, feeding the reaction liquid into a heat exchanger to remove reaction heat, dividing the reaction liquid subjected to heat exchange into two streams through a cross-flow filter, feeding one stream of penetrating fluid into a rectification device, and feeding the other stream of concentrated liquid back to the reaction kettle for continuous reaction.

The invention relates to the technical field of carbon nanotubes, and particularly discloses a purification method of a carbon nanotube. The purification method of the carbon nano tube comprises the following steps: (1) weighing a carbon nano tube crude product and various raw materials, (2) adding the carbon nano tube crude product and a surfactant into deionized water, and carrying out ultrasonic dispersion to obtain a dispersion liquid, (3) carrying out gradient centrifugation on the dispersion liquid, and taking an upper-layer suspension liquid, and (4) mixing hydrochloric acid, nitric acid and the suspension liquid, and treating the carbon nano tube to obtain the carbon nano tube. (5) treating the carbon nano tube by dilute acid, mildly oxidizing the carbon nano tube by using a low-concentration hydrogen peroxide solution, and then placing the carbon nano tube in a magnetic field to adsorb magnetic impurities, (6) carrying out cross-flow filtration by using a polycarbonate microfiltration membrane and collecting the treated carbon nano tube, and (7) annealing the treated carbon nano tube by using inert gas and freeze-drying to obtain the purified carbon nano tube. According to the purification method, the metal catalyst, amorphous carbon and graphite impurities can be efficiently removed, and meanwhile, the integrity of the tube wall of the carbon nano tube is kept.

The invention relates to the technical field, and discloses a product dehydration optimization method based on an inclined box dense grader and an HNS ultrafilter, which comprises the following steps: introducing slurry into a vibration inclined box dense grader through a feed distribution system, and dynamically adjusting the vibration frequency, amplitude and period by combining an intermittent vibration system and a slurry concentration detection control system, the concentration self-adaptive control is realized; overflowing slurry is conveyed into an HNS ultrafilter through a slurry conveying system, and efficient separation is achieved through a centrifugal force field and cross flow filtration; the filtrate is shunted by a clear water self-circulation system and is used for process recycling and equipment cleaning; and the concentrated discharged slurry of the HNS ultrafilter and the underflow of the thickener are mixed and output or return to the previous process. The general drawing arrangement is optimized, the slurry dehydration efficiency is improved, and valuable metal is recycled to the maximum extent.

The present invention relates to the technical field of waste lubricating oil treatment, and discloses a non-distillation regeneration apparatus and system, the non-distillation regeneration apparatus comprises: a high pollution lubricating oil pretreatment unit for removing water and other large particle impurities in waste oil; the electro-adsorption unit is used for capturing pollutants such as polar oxides and colloids in oil by adopting a porous conductive framework under the action of a direct-current electric field; the molecular filtering unit is used for carrying out cross-flow filtering by utilizing a ceramic membrane assembly and removing macromolecular non-ideal components; the deep purification unit is filled with a composite adsorbent to further purify the base oil, and the final product quality is ensured. By means of the innovative electro-adsorption refining filter and the multi-stage collaborative purification process, efficient regeneration of the waste lubricating oil under the non-distillation condition is achieved, high-quality base oil can be stably produced, and the method has the remarkable advantages of being energy-saving, environmentally friendly and high in automation degree.

The utility model belongs to the field of water treatment and material separation, and provides a reversible cross-flow filtering membrane device, which comprises a membrane unit, a water outlet end interface, two circulation end interfaces, a first pipeline, a second pipeline, a second pipeline and a third pipeline, the membrane unit is provided with a water production end interface and two circulation end interfaces, the two circulation end interfaces are communicated through the first pipeline, the first pipeline is provided with a two-way liquid pumping assembly, and the flow direction of fluid can be changed through the two-way liquid pumping assembly; an outlet of the water inlet pump communicates with the first pipeline, and a check valve is arranged at the outlet of the water inlet pump; and the water producing tank is communicated with the water producing end interface through a second pipeline. According to the device, the two circulation end interfaces of the membrane unit are communicated through the first pipeline to form a circulation loop, and then the reversing of circulating water flow can be realized through the two-way liquid pumping assembly. By arranging a pressure sensor, a control system and the like, the circulation direction can be automatically switched according to pressure or timing, and bidirectional cross-flow filtration of the membrane unit is realized. The accumulation of pollutants on the surface of the membrane can be avoided, the risk of membrane pollution blockage and scaling is reduced, high flux can be maintained, the membrane washing frequency is reduced, and the operation cost is reduced.

The invention discloses a treatment method of electroplating wastewater, and belongs to the technical field of electroplating wastewater treatment. The process comprises the following steps: electrically adjusting the pH value of the electroplating wastewater to 2.5-4.0, adding ferrite, adopting a Ti / PbO2 anode and a graphite cathode, controlling the current density to 15-30mA / cm, introducing air, reacting for 40-80 minutes, and adjusting the pH value to 6.0-7.0 after the reaction; introducing the wastewater into a chelating resin column, wherein the chelating resin is an amino phosphonic acid type or iminodiacetic acid type; the method comprises the following steps of: introducing into a built-in filter column, loading two layers of recrystallized silicon carbide honeycomb ceramic membranes in the filter column in parallel, performing cross-flow filtration under the conditions that the operation pressure is 0.8-2.0 MPa, the temperature is 25-40 DEG C and the cross-flow velocity is 1.5-3m / s, and collecting permeate; the permeate liquid is used for backwashing every 8-12 hours of operation. According to the method, heavy metal ions in the electroplating wastewater can be effectively removed, and the treatment efficiency of the electroplating wastewater is improved.

The utility model relates to a beer filtering device applying a cross-flow filtering technology, which comprises a base, a stock solution tank is fixedly mounted at the top of the base, a storage tank is fixedly mounted at the top of the base, and a filtering mechanism is arranged at the top of the base. According to the beer filtering device applying the cross-flow filtering technology, when beer needs to be filtered, firstly, a controller drives a booster pump outside a first water inlet pipe to be started, at the moment, the beer liquid enters a first filtering tank through the first water inlet pipe, and at the moment, a first filtering membrane group can roughly filter the beer through a porous supporting layer, a transition layer and a separation layer; at the moment, part of the fermented beer liquid flows through the upper end of the first filtering membrane group under the action of flow shearing force, the electromagnetic valve is started, enters the return pipe from the first shunt pipe and returns to the stock solution tank through the return pipe, the rest of the beer liquid enters the second filtering tank through the second water inlet pipe, and the secondarily filtered beer liquid enters the storage tank through the guide pipe, so that filtering is completed.

The utility model discloses a landfill leachate anaerobic membrane bioreactor which comprises an anaerobic reactor, a membrane component and a recovery component, a water inlet pipe and a water return pipe are arranged between the membrane component and the anaerobic reactor, a water inlet pump is arranged on the water inlet pipe, and a water outlet pump is arranged on the water return pipe. The recovery assembly comprises a water-sealed tank, a gas inlet pipe, a connecting pipe, a fan and a boiler which are arranged on the connecting pipe, a heating coil arranged in the anaerobic reactor, and a hot water pipe and a return pipe which are arranged between the boiler and the heating coil. Compared with a traditional built-in membrane assembly, the external membrane assembly has the advantages that the water inlet pump is used for providing the flow speed required by cross-flow filtration, the cross-flow filtration effectively reduces membrane pollution, and meanwhile, the external membrane assembly does not need to use biogas to wash the membrane surface, so that the membrane assembly is more convenient and safer to maintain and replace; in addition, the risk of biogas poisoning and even explosion during membrane replacement is reduced, and the operation stability of the landfill leachate anaerobic membrane bioreactor is enhanced.

This product relates to the field of eyewash production technology, providing a filter for eyewash production, including a raw material tank for storing the eyewash concentrate, a coarse filter for filtering large particulate impurities, and a cross-flow filter including a filter tube and a filter membrane. One end of the filter tube is connected to the coarse filter, and the other end passes through the cross-flow filter and connects to the raw material tank. An opening is provided at the bottom of the filter tube located inside the cross-flow filter. The filter membrane is positioned on the opening and parallel to the flow direction of the eyewash through the filter tube, used to filter large molecular impurities in the eyewash. This filter removes large molecules through the opening parallel to the flow direction of the eyewash and the filter membrane, and washes away any remaining large molecules on the filter membrane surface through the flow of the eyewash, preventing large molecules from clogging the filter membrane and improving the utilization rate of the filter membrane.

The invention belongs to the technical field of chemical vapor deposition, and particularly relates to a CVD (chemical vapor deposition) high-purity gas filtering and reducing method which comprises the following steps: S1, gas pretreatment: firstly, carrying out particle filtering on gas, then, carrying out condensation and water removal on the gas, and then, carrying out adsorption and oxygen removal on the gas; s2, filtering: carrying out membrane filtration on the gas subjected to adsorption deoxygenation, then carrying out magnetic control adsorption separation on the gas, and then carrying out catalytic filtration on the gas; s3, reduction reaction: selecting a reducing gas, and then carrying out mixed reduction reaction on the catalytically filtered gas and the reducing gas by utilizing a reactor; and S4, quality monitoring and control: monitoring the parameters of the reduced gas in real time, and then controlling the system according to the monitored data. An efficient membrane filtration technology is adopted, a cross-flow filtration mode is combined, operation is carried out under appropriate pressure and temperature conditions, and compared with a traditional filtration technology, the filtration treatment capacity of gas in unit time is remarkably improved.

The invention discloses a device for automatically concentrating bacteria in a water environment, and belongs to the technical field of microbiological detection and enrichment equipment. By arranging a combined structure of the sediment filtering module and the cross-flow enrichment module, large-particle impurities can be removed on the premise that downstream analysis is not affected, meanwhile, bacteria are accurately intercepted, and the overall enrichment efficiency is improved; a cross-flow filtering structure effectively alleviates the problem of filter membrane blockage, and stable enrichment can be carried out on a water sample from several liters to dozens of liters under field or laboratory conditions in cooperation with a circulating design and a high-flux water pump; the automation degree is high, operation is easy and convenient, and on-site enrichment can be achieved; a relay is adopted to control each functional module, and a control system based on an RS-485 bus is combined, so that the functions of multi-segment program control, automatic start and stop, remote monitoring and the like are supported, the manual intervention requirement is reduced, and the operation stability is improved. The system is combined with field communication equipment, can construct a multi-point sampling and centralized control microorganism sampling network, and is suitable for monitoring different water bodies such as rivers, lakes, reservoirs and the like.

The application discloses a preparation method of xylose, which comprises the following steps: S1, adding xylanase into a xylose mother liquor for enzyme hydrolysis and viscosity reduction; S2, adding calcium hydroxide into the enzyme hydrolysis liquor and passing in CO2 to generate nanometer calcium carbonate floccus to adsorb impurities; S3, performing cross-flow filtration on the ceramic-polyether sulfone composite membrane to improve the purity of the xylose; S4, performing multistage countercurrent chromatography separation on the calcium type strong acid cation resin, and dynamically adjusting an elution gradient through online HPLC feedback; and S5, performing three-effect evaporation concentration, then stage cooling crystallization, adding alpha type xylose crystal seeds to control the crystal form; the application utilizes enzyme hydrolysis-flocculation to cooperatively reduce the viscosity of the mother liquor to greater than or equal to 45%, and the nanometer floccus has an impurity adsorption efficiency greater than or equal to 85%; a dynamic chromatography separation factor is improved to 1.8, and the xylose recovery rate is greater than or equal to 96.2%; alpha type crystal purity greater than or equal to 99.5% is obtained through gradient crystallization, and the comprehensive energy consumption is reduced; and the enzyme hydrolysis conversion of the raffinate generates xylooligosaccharide and high fructose syrup.

This utility model discloses an inlet baffle ring and a cross-flow filter assembly for a multi-channel internal filtration columnar cross-flow filter element, solving the technical problem of easy clogging at the inlet end of the multi-channel internal filtration columnar cross-flow filter element. It includes a baffle ring body, which is detachably installed in the inlet channel before the inlet end of the multi-channel internal filtration columnar cross-flow filter element during use. The baffle ring body is densely covered with inlet through holes, which are used to guide the liquid to be filtered, flowing from the inlet channel to the inlet end of the multi-channel internal filtration columnar cross-flow filter element, into the inlet end of the multi-channel internal filtration columnar cross-flow filter element. The inlet baffle ring of the multi-channel internal filtration columnar cross-flow filter element ensures that the liquid to be filtered passes through the inlet through holes before entering the multi-channel internal filtration columnar cross-flow filter element, preventing large particles of impurities from directly contacting and clogging the inlet end of the multi-channel internal filtration columnar cross-flow filter element.

The invention discloses a gas-liquid-solid three-phase airlift external loop reactor integrated with a cross-flow filtering device and application of the gas-liquid-solid three-phase airlift external loop reactor in dimethyl carbonate synthesis. The core of the invention lies in that a high-temperature-resistant special ceramic membrane cross-flow separator is directly integrated in an outer circulation downcomer of the reactor, so that a liquid-phase product generated by reaction can be efficiently, continuously and stably separated from a micron-sized solid catalyst on line; and the catalyst is efficiently intercepted and directly returns to the reaction zone to form a closed-loop cycle. The process defects that a traditional metal filter is easy to block, needs frequent maintenance and depends on a high-energy-consumption flash evaporation separation catalyst are overcome. Compared with a traditional reactor and a separation process, the device can stably maintain the concentration and activity of the catalyst in the reaction zone, has the remarkable advantages of low energy consumption, high separation efficiency, compact structure and continuous operation, and has a wide industrial application prospect.

The invention discloses a fermentation-membrane separation coupling production method of high-purity lysine, and belongs to the technical field of amino acids, the method comprises the following steps: fermentation: inoculating a corynebacterium glutamicum seed culture solution in a lysine fermentation culture medium, carrying out fermentation culture at 32-34 DEG C for 28-30 hours, and when the fermentation culture is carried out for 17-19 hours, carrying out membrane separation on the fermentation culture medium to obtain the high-purity lysine. N-(4-aminobutyl) acetamide is added; performing membrane separation: performing cross-flow filtration on the fermentation liquor by adopting a surface modified membrane, controlling the inlet pressure to be 0.4-0.5 MPa, the outlet pressure to be 0.2-0.3 MPa and the temperature to be 30-35 DEG C, and obtaining a lysine crude product after the membrane separation is finished; post-treatment: carrying out ion exchange and crystallization on the lysine crude product to obtain a high-purity lysine product; the release of viscous pollutants is reduced from a fermentation source, the pollution resistance of the membrane is improved, the flux recovery rate of the membrane is improved, and efficient coupling of fermentation and separation is realized.

The invention relates to the field of methanol synthesis catalysts, and particularly discloses a high-purity low-sodium methanol synthesis catalyst and a preparation method thereof. The preparation method of the high-purity low-sodium methanol synthesis catalyst comprises the following steps: mixing aluminum nitrate and sodium hydroxide for reaction to obtain pseudo-boehmite colloid; carrying out cross-flow filtration on the pseudo-boehmite colloid by adopting an ultrafiltration membrane under an ultrasonic condition, and carrying out backwashing to obtain sodium-removed alumina gel; mixing sodium carbonate with the copper-zinc mixed solution for co-precipitation, and washing the precipitate to obtain a binary precursor; and mixing the sodium-removed alumina gel with the binary precursor, pulping, aging, washing to further remove sodium, filtering, and drying, granulating, calcining and forming a filter cake to obtain the high-purity low-sodium methanol catalyst. The preparation method of the high-purity low-sodium methanol catalyst has the advantages that the content of impurity sodium can be reduced, and the catalytic activity and selectivity of the methanol synthesis catalyst are improved.

The utility model relates to the field of wine cross flow, in particular to a wine cross flow filter. The filter comprises a filter cartridge, and a filter frame is arranged in the filter cartridge. The cross-flow filter element is carried by the filter frame in the filter cartridge, so that impurities in wine can be effectively filtered; a second gear in the cleaning mechanism drives a filter frame and a cross-flow filter element to synchronously rotate, so that a cleaning brush can timely remove blockages on the surfaces of the filter frame and the filter element, the influence of impurity accumulation on the filter efficiency is avoided, continuous and smooth filtration of wine is ensured, and the product purity is improved; moreover, when the filter frame and the filter element rotate, a flushing system composed of a water injection pipe, a flow dividing column and a spray head can conduct water flow flushing on the filter frame and the filter element, fine particles and viscous substances in filter hole channels and gaps are deeply cleaned, double cleaning of mechanical friction and fluid flushing is achieved in cooperation with a cleaning brush, the cleanliness is improved, and the risk of secondary pollution is reduced.

The utility model relates to the technical field of ship environment-friendly treatment, in particular to a cross-flow filtering module of ship membrane treatment equipment, which comprises a pipeline assembly, a circulating pump and a filtering assembly, the pipeline assembly comprises a water inlet pipe, a circulating pipe, a clear water header pipe and a sludge pipe, and the outlet of the water inlet pipe and the inlet of the sludge pipe are both communicated with the circulating pipe; a filter assembly is communicated between an outlet and an inlet of the circulating pump through a circulating pipe and comprises a shell and cylindrical filter membranes, the shell is provided with an inner cavity, a water inlet, a water outlet and a clear water outlet, one end of the clear water outlet extends to the inner cavity, the other end of the clear water outlet is communicated with a clear water main pipe, and each cylindrical filter membrane is provided with a circulating channel in the axis direction. The two ends of the circulation channel are communicated with the water inlet and the water outlet respectively, when fluid flows to the water outlet from the water inlet, the fluid flows through the circulation channel, sewage entering the barrel-shaped filter membrane continuously washes the surface of the inner wall of the barrel-shaped filter membrane, and the advantage that pollutant retention on the membrane surface is reduced is achieved.

A collagen treatment structure (10), system and method. The collagen treatment structure (10) comprises a treatment cavity (11) and a centrifugal treatment mechanism (12). The treatment cavity (11) is provided with a discharge port (111). The centrifugal treatment mechanism (12) comprises centrifugal ultrafiltration members (122) and a centrifugal driving member (121) connected thereto, wherein the centrifugal ultrafiltration members (122) are driven by the centrifugal driving member (121) to rotate; the centrifugal ultrafiltration members (122) are arranged in the treatment cavity (11); each centrifugal ultrafiltration member (122) is provided with ultrafiltration membrane layers (1221) on two opposite surfaces; a filtering cavity (1222) is provided inside each centrifugal ultrafiltration member (122); and each centrifugal ultrafiltration member (122) is further provided with a waste liquid hole (1223) in communication with the filtering cavity (1222), and the waste liquid holes (1223) are in communication with the discharge port (111). By combining the principles of centrifugation and cross-flow filtration, and under the action of a centrifugal force, membrane-surface filter layers are efficiently removed, the membrane-surface concentration difference is eliminated, and a membrane blockage phenomenon does not easily occur, such that the purity of collagen is improved, and the collagen concentration can reach 20 mg / ml.

The application provides a method and a system device for continuous salt removal in a triacetone amine rectification process, and the method comprises the following steps: performing solid-liquid separation treatment on a salt-containing organic liquid obtained in the rectification, and the solid-liquid separation treatment is sedimentation treatment; performing cross-flow filtration treatment on a liquid phase obtained in the solid-liquid separation to obtain a permeate and a concentrated liquid, and the permeate is the salt-removed organic liquid. The method and the system device can ensure the continuity and intensiveness of the rectification process, shorten the high-temperature residence time of the material, reduce the energy consumption, and at the same time, maximize the reduction of high-temperature polymerization of the material, and improve the yield.

The invention relates to the technical field of electronic industrial wastewater, and discloses a grinding wastewater reuse treatment system, which comprises a wastewater collection module, a disc type filtration module, a ceramic membrane filtration module, an RO treatment module, a produced water reuse module and an automatic control module. The water quality and water quantity homogenization adjustment is performed on the grinding wastewater through the wastewater collection module; suspended solids are mechanically intercepted through a disc type filtering module by adopting a filtering disc with a groove; the ceramic membrane filtration module is used for performing cross-flow filtration to separate colloid and pollutants; residual particles are reduced through a security filter of the RO treatment module; and finally, the produced water is stored and conveyed to a pure water system by the produced water recycling module, so that wastewater recycling is realized. And the automatic control module realizes full-automatic chain operation through the PLC unit and the instrument monitoring unit. According to the invention, the wastewater recycling rate and the system reliability are improved, and the requirements and operation and maintenance of the semiconductor industry on water resource recycling are met.

The embodiment of the invention discloses a muddy water treatment system and a muddy water treatment method. The muddy water treatment system comprises a sedimentation tank, a potential mixer, a water pump, a first dosing unit and an ultrafiltration unit, the settling pond is used for settling suspended matters in water; the potential mixer is communicated with the sedimentation tank and is used for mixing fluid and total solids in the potential mixer; the water pump is used for conveying clear liquid containing particles and colloids in the sedimentation tank into the potential mixer; the first dosing unit is communicated with the potential mixer, and the first dosing unit is used for adding cationic polyelectrolyte into the potential mixer; the ultrafiltration unit is communicated with the potential mixer and comprises a hollow fiber ultrafiltration membrane, and the hollow fiber ultrafiltration membrane is used for performing cross-flow filtration on liquid entering the ultrafiltration unit. According to the muddy water treatment system and the muddy water treatment method disclosed by the embodiment of the invention, fine particles and colloidal substances can be effectively prevented from being blocked or adsorbed in membrane holes and inlets, so that membrane pollution is relieved fundamentally.

The application provides a crude oil demetallization method and relates to the technical field of petroleum refining processing. The method avoids the disadvantages of the traditional demetallization method of an electric desalting device, selects the ultrasonic technology to strengthen the crude oil demetallization process before the crude oil enters the electric desalting device, removes the chelate precipitate by using the cross-flow filtration technology and the phase separation technology, improves the utilization rate of the demetallization agent, controls the residence time of the demetallization reaction by using a permeation side control valve, makes the oil agent mixture circulate in the system, realizes the efficient removal of the metal in the crude oil, and constructs a continuous online recyclable demetallization process technology.

The application provides a terephthalic acid bis-hydroxyethyl ester crude product purification method and device and a terephthalic acid bis-hydroxyethyl ester preparation method. The method comprises the following steps: allowing a first mixed solution containing terephthalic acid bis-hydroxyethyl ester crude product to enter a first adsorption unit, performing first adsorption treatment in the presence of a first adsorbent, and obtaining a second mixed solution; allowing at least part of the second mixed solution to enter a cross-flow filtration unit, performing cross-flow filtration through a cross-flow membrane, and obtaining a first filtrate containing terephthalic acid bis-hydroxyethyl ester and a first slurry containing activated carbon; allowing the first filtrate to enter a second adsorption unit, performing second adsorption treatment in the presence of a second adsorbent, and obtaining a purified solution; and allowing the purified solution to enter a crystallization unit to perform crystallization treatment, and obtaining purified terephthalic acid bis-hydroxyethyl ester. The method can avoid filter membrane pollution and blockage, avoid single adsorption effect, maintain stable adsorption efficiency, and realize recycling and recovery of the adsorbent.

The invention discloses a portable SF6 waste gas degradation treatment device applied to a transformer substation, and relates to the technical field of waste gas treatment.The portable SF6 waste gas degradation treatment device comprises a waste gas box, a pretreatment mechanism, a rolling mechanism, a filtering mechanism, a cleaning mechanism, a degradation mechanism and a tail gas absorption pool; the multiple rolling mechanisms are arranged in an inner cavity of the pretreatment mechanism in an up-down staggered mode, the filtering mechanism is installed at one end of the pretreatment mechanism, the cleaning mechanism is arranged in an inner cavity of the filtering mechanism, the degradation mechanism is installed at one end of the pretreatment mechanism, and the tail gas absorption pool is connected with the gas outlet end of the degradation mechanism through a pipeline. Through the arrangement mode that the pretreatment mechanism and the rolling mechanism are matched, cross-flow filtration of waste gas is achieved, macromolecular pollutants such as SF6 can be efficiently filtered out, the particle separation effect is enhanced, the waste gas can be catalytically degraded through the degradation mechanism, and the degradation efficiency is improved.

The present invention relates to an observation device system and method for particle motion in continuous cross-flow filtration. By designing a flat membrane cross-flow filtration device, ideal cross-flow filtration can be achieved, thereby being consistent with the ideal flow conditions in a theoretical model. At the same time, non-invasive observation of particle motion can be achieved, avoiding the influence of a lens on the cross-flow in invasive observation. The particle motion observation using the observation device system is simple and easy to operate, has efficient data processing, intuitive experimental recording results, low measurement cost, and can comprehensively obtain particle dynamics information such as particle displacement and velocity.

The utility model discloses an external circulating treatment device for cross-flow filtration. The external circulating treatment device comprises a reaction kettle, an external filtering assembly and a stirring assembly, the external filtering assembly comprises a cross-flow filter, a circulating feeding pipe, a circulating discharging pipe, a filtrate collecting pipe and a circulating pump; the cross-flow filter is provided with a filtering channel and a filtrate collecting cavity, the two ends of the filtering channel are communicated with the reaction kettle treatment cavity through a circulating feeding pipe and a circulating discharging pipe respectively, a filtrate collecting pipe is communicated with the filtrate collecting cavity, and the circulating pump is arranged on the circulating discharging pipe. The stirring assembly comprises a motor, a stirring shaft, a stirring piece and a rotating joint; the motor is in driving connection with the stirring shaft; the rotary joint is mounted on the stirring shaft and is provided with an air inlet; an air outlet is formed in the outer wall of the stirring shaft, an air guide channel is formed in the stirring shaft and communicated with the air inlet and the air outlet, and the stirring piece is fixedly connected to the stirring shaft. The device can realize continuous treatment of stirring and filtering processes, improves product quality and treatment efficiency, and realizes recycling of solid materials.

This invention relates to the field of oil-water separation technology, and provides a method and system for treating industrial oily wastewater based on dynamic membrane separation. The method includes: performing demulsification and oil removal operations on solids-free wastewater to obtain primary wastewater and demulsifier usage records, and acquiring oil droplet particle size distribution; obtaining the maximum particle size of a preset minimum percentage of oil droplets from the oil droplet particle size distribution to obtain a first particle size, and acquiring a target safety factor; performing a weighted calculation on the first particle size and the target safety factor to obtain the target pore size of the dynamic membrane; querying the type of pre-coating agent corresponding to the target pore size of the dynamic membrane to obtain a desired type; identifying the application instruction sequence based on the desired type and the target pore size of the dynamic membrane; performing a surface modification operation on a cross-flow filter ceramic substrate membrane using the target pre-coating agent according to the application instruction sequence to obtain a target dynamic membrane; and performing oil-water separation. This invention can improve the separation efficiency of oil-water separation in wastewater.

An operation method of a hollow fiber membrane module is described, the operation method including: a filtration step of performing cross-flow filtration by supplying a feed to an outer surface side of a hollow fiber membrane, in which in the filtration step, a ratio of a viscosity μf of the feed to a viscosity μp of a filtrate satisfies a relation of μf / μp≥1.5, and a flow rate ratio of a flow rate vp of the filtrate to a flow rate vf of the feed satisfies a relation of 0.02≤vp / vf≤0.3.

The invention discloses a preparation method of a high-flux graphene oxide ceramic composite nanofiltration membrane, and belongs to the technical field of membrane separation, and the preparation method comprises the following steps: (1) preparing a graphene oxide aqueous solution; (2) soaking the porous ceramic membrane support body with a sodium hydroxide solution to obtain an activated ceramic membrane support body; (3) soaking the activated ceramic membrane support body in a 3-aminopropyldiethoxysilane ethanol solution, and reacting at room temperature to obtain a grafted ceramic membrane support body; (4) at room temperature, diluting a graphene oxide aqueous solution, adding tannic acid and lysine, and carrying out a cross-flow filtration reaction on the surface of the grafted ceramic membrane support; and (5) carrying out heat treatment on the material obtained in the step (4) to obtain the graphene oxide ceramic composite nanofiltration membrane. The prepared high-flux graphene oxide ceramic composite nanofiltration membrane is ordered in structure, high in binding force, high in mechanical strength and suitable for industrial scale production, and has good economical efficiency and application potential.