1282 results about "Hollow fiber membrane" patented technology

The invention provides an inert gas generation system, and relates to the technical field of industrial gas production. The inert gas generation system comprises the following modules: a gas pretreatment module, an intelligent separation module, a dynamic purification module, a pressure regulation and control module, a quality analysis module, a safety control module and an energy efficiency optimization module, and the gas pretreatment module is used for removing particulate matters through an electrostatic dust collection device by adopting a multi-stage gradient filtering algorithm based on ambient air input, adjusting humidity by combining a dew point control technology, forming a standardized gas source and generating a standard gas source. Through combination of a multi-stage gradient filtering algorithm and a dew point control technology, collaborative treatment of particulate matters and humidity is realized, stable gas source input is formed, the reliability of a subsequent processing link is improved, membrane separation parameters are dynamically predicted by applying a convolutional neural network model, and the permeation efficiency of a hollow fiber membrane stack is optimized.

The invention provides a hollow fiber membrane cleaning pressure self-adaptive adjustment control method and system, and relates to the technical field of control, and the method comprises the following steps: in a set temperature range, washing a water inlet side and a water production side through a constant flow, and determining a target transmembrane pressure difference interval; according to the transmembrane pressure difference deviation and the change rate, the rotating speed of a water inlet pump and the opening degree of a concentrated water discharge valve are cooperatively regulated and controlled according to a valve-first and pump-second sequence; when the transmembrane pressure difference reaches the upper limit and pollution is reversible, an impact cleaning sequence is generated, the opening of a concentrated water valve is increased, and the rotating speed of a water inlet pump is increased to form shear scouring. According to the invention, the self-adaptive adjustment of the cleaning pressure in the membrane pollution process is realized, and the membrane cleaning efficiency is improved.

The invention relates to the technical field of sewage treatment, in particular to an MABR hollow fiber composite membrane and a preparation method and application thereof.The preparation method comprises the following steps that raw materials, a reinforcing agent and a dispersing agent are put into a kneading machine to be kneaded for 1-2 hours, a modifying agent is put into the kneading machine, the mixture is heated to 80-120 DEG C and kneaded for 4 hours, and a modified material is obtained; the preparation method comprises the following steps: uniformly mixing a modified material, a catalyst, a cross-linking agent and a solution to prepare mixed slurry with the solid content of 5-40%, coating the slurry on the surface of a hollow fiber tube, and curing to obtain the MABR hollow fiber membrane, so that the mechanical strength of a basic raw material is improved through a reinforcing agent, the membrane is not easy to damage, and the service life of the membrane is prolonged. According to the present invention, the reinforcing agent and other auxiliary agents are uniformly dispersed in the basic raw material through the dispersant so as to reduce defects, the raw material end-capping group is modified through the modifier so as to provide the product with characteristics of aging resistance and good biocompatibility, and the reaction speed is changed during the molding process through the catalyst so as to form the stable membrane structure through the molding cross-linking of the cross-linking agent and the raw material;

The invention discloses a device and a method for realizing low-carbon-nitrogen-ratio sewage autotrophic and heterotrophic coupled deep nitrogen and phosphorus removal based on a continuous flow membrane aeration bio-membrane reactor. A hollow fiber membrane is arranged in the continuous flow reactor, and an oxygen concentration gradient is formed through a bubble-free membrane aeration technology. In the biomembrane area, spatial partitions of functional bacteria such as nitrifying bacteria and anaerobic ammonium oxidation bacteria are established, and the two anoxic areas realize efficient nitrogen removal through short-cut denitrification coupling anaerobic ammonium oxidation (PD / A) and synchronous nitrification and denitrification. In the aspect of phosphorus removal, the system adopts an anaerobic-aerobic operation mode, phosphorus-accumulating bacteria release phosphorus anaerobically and absorb excessive phosphorus aerobically, and finally, phosphorus removal is realized through residual sludge discharge. The system integrates an internal carbon source extraction process, recovers a sludge carbon source and supplements an electron donor required by denitrification, and reduces the operation cost and carbon emission. The continuous flow MABR denitrification system enhances the denitrification efficiency of the PD / A system, is suitable for large-scale operation, and efficiently and stably realizes deep denitrification of a low-carbon-nitrogen-ratio urban sewage treatment plant.

The invention discloses a filtering device for reinfusion after external drainage of bile in the hepatobiliary surgery department, and belongs to the technical field of medical instruments. The filtering device comprises a drainage mechanism, a stepped filtering mechanism and a reinfusion mechanism. The stepped filtering mechanism is used for filtering bile; the stepped filtering mechanism is detachably connected with the drainage mechanism and the feedback mechanism. The stepped filtering mechanism comprises a filtering carrier, a filtering cavity and a pumping mechanism used for pumping bile to the filtering cavity are arranged in the filtering carrier, a primary screen, a hollow fiber membrane and a hydrophilic gel filtering membrane are sequentially arranged in the filtering cavity from top to bottom, and a cleaning mechanism used for cleaning the primary screen is arranged on one side of the primary screen. An ultrasonic vibration module for cleaning attachments on the hollow fiber membrane is arranged on one side of the hollow fiber membrane. By means of the intelligent design and the multi-stage filtering mechanism, the bile feedback efficiency and safety are remarkably improved, and the infection risk is reduced.

The invention discloses a double-layer aeration system for preventing wire breakage and sludge deposition of an MBR double-layer component membrane pool, which comprises a raw water pool, a raw water inlet peristaltic pump, an MBR double-layer component membrane pool, a perforated aeration pipe, a pulse aeration box, an aeration pump, a gas meter, a water outlet gear pump, an ultrafiltration membrane component, a pressure sensor, a transmembrane pressure difference display, a sludge discharge peristaltic pump and a water outlet pool, the MBR double-layer assembly membrane pool comprises a first MBR membrane assembly and a second MBR membrane assembly, the first MBR membrane assembly and the second MBR membrane assembly are arranged in parallel, and the perforated aeration pipe and the pulse aeration box are configured to be used as aeration assemblies of the first MBR membrane assembly and the second MBR membrane assembly. According to the invention, the membrane is physically scrubbed by utilizing different aeration modes and a double-layer aeration mode, so that the phenomena of membrane pollution, sludge accumulation and wire breakage are effectively relieved, a reliable theoretical basis is provided for transforming an MBR membrane tank into a double-layer aeration mode in a water purification plant using the MBR hollow fiber membrane, and meanwhile, the method has important significance on reducing pollution and carbon.

The invention discloses a membrane pore aeration ozone heterogeneous catalytic reactor and a water treatment system, and relates to the technical field of water treatment. The reactor comprises a reactor cavity, the top of the reactor cavity is provided with a water outlet assembly, and the bottom is provided with a water inlet assembly and a gas inlet assembly; the membrane component is arranged in the reactor cavity and comprises a bundle of hollow fiber membrane filaments which are bent in a U shape; the two ends of the hollow fiber membrane filaments are bundled and fixed in a mounting hard tube, the mounting hard tube is detachably connected with the air inlet assembly, and the air inlet assembly is used for communicating an external air supply device with the hollow fiber membrane filaments; micropores are distributed in the surfaces of the hollow fiber membrane filaments; and the reactor cavity is filled with catalyst particles. According to the membrane pore aeration ozone heterogeneous catalytic reactor provided by the invention, the ozone mass transfer efficiency and the utilization rate are improved, and the content of hydroxyl radicals used for degrading organic matters in water is increased, so that the organic matters which are difficult to degrade in water can be more effectively removed, and the ozone treatment operation cost is reduced.

The invention belongs to the technical field of sewage treatment, and discloses a two-stage MABR-based efficient denitrification system, method and application, the system comprises an MABR-PN / DN reactor, an MABR-PN / A reactor, a peristaltic pump, an aeration hollow fiber membrane module, a carrier, an aeration pump, a gas flowmeter, a pressure gauge and a liquid flowmeter, and the MABR-PN / DN reactor and the MABR-PN / A reactor are arranged along the vertical direction. According to the system, the series design of the MABR-PN / DN and the MABR-PN / A is utilized, the adverse effect of organic matter in sewage on anaerobic ammonia oxidation treatment of high-concentration ammonia nitrogen wastewater is reduced, nitrate nitrogen generated by the MABR-PN / A flows back to the first-stage MABR-PN / DN to achieve denitrification, the denitrification limitation of a single reactor and a single denitrification path is broken through, and the overall total nitrogen removal rate of the system is higher than 90%.

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 provides a PTFE modified membrane, a modification method thereof, a wastewater treatment system and a wastewater treatment method, the PTFE modified membrane is obtained by adding metal oxide catalyst particles into a PTFE polymer for modification, and the weight of the metal oxide catalyst particles accounts for 5-20% of the weight of the PTFE polymer; the diameter of the metal oxide catalyst particles is 10-100 nm; the pore-forming rate of the PTFE modified membrane is 53-62%, and the pore diameter range is 0.1-1 [mu] m. The metal oxide catalyst particles are added into the PTFE polymer of the hollow fiber membrane for modification to form the PTFE modified membrane, so that the gasification catalytic effect of ozone on the surface of the membrane material of the hollow fiber membrane module is improved, and full contact, mixing and net-effect removal of pollutants and ozone are realized; therefore, the pollutant removal rate and the quality of a product produced by wastewater treatment are improved; the technological process is simple, field application is convenient, and product performance is stable.

Disclosed are multi-cartridge hollow fiber membrane apparatuses and methods for gas separation using them. Each external pressure type membrane apparatus contains one or more series of cartridges wherein the cartridges within each series are arranged sequentially. The retentate gas generated by each preceding cartridge in the series is used as a feed gas to the next cartridge in the series, and the permeate gas generated by a cartridge following the first cartridge in the series is used as a sweep gas on the permeate side of the preceding cartridge. The multicomponent gas mixture is separated into one or more products by the method of the invention with improved product recovery and / or product purity.

Algae harvesting and cultivating systems and methods for producing high concentrations of algae product with minimal energy. In an embodiment, a dead-end filtration system and method includes at least one tank and a plurality hollow fiber membranes positioned in the at least one tank. An algae medium is pulled through the hollow fiber membranes such that a retentate and a permeate are produced.

The invention relates to the field of water treatment, and particularly discloses a 3D arch-bridge-shaped carbon nano tube hollow fiber membrane solar interface evaporator and a preparation method and application thereof.The 3D arch-bridge-shaped carbon nano tube hollow fiber membrane solar interface evaporator comprises heat insulation foam used for floating on the sea surface, and the upper surface of the heat insulation foam is provided with an arch-bridge-shaped evaporation component which is used for seawater evaporation and is of a porous and / or multi-gap structure; the arch-bridge-shaped evaporation part is an arch-bridge-shaped carbon nano tube hollow fiber membrane. The solar interface evaporator integrates multiple functions of light absorption, water transmission, salt tolerance and the like, can efficiently utilize solar energy to carry out seawater desalination, has the characteristics of high evaporation speed, high photo-thermal conversion efficiency and high stability, and has a wide application prospect in the field of solar seawater desalination.

The invention belongs to the technical field of water electrolysis hydrogen production, and relates to a modification method of an alkali-resistant super-hydrophobic PTFE hollow fiber membrane and a membrane component, the method adopts the main process of alkali treatment hydroxylation, fluorosilane coating growth and heating curing, and a hydrophobic layer is grown on the surfaces of the PTFE hollow fiber membrane and the component thereof, so that super-hydrophobic modification is realized. A perfluorosilane hydrophobic layer and a rich long-chain CF2 structure are uniformly and densely distributed on the surface of the modified membrane, so that the surface energy of the PTFE membrane is remarkably reduced, and meanwhile, the surface roughness is improved, so that the hydrophobicity is improved; due to the anti-infiltration performance of the coating, seawater and a concentrated alkali solution are not easy to attach to the surface of the membrane, so that the service life of the membrane component in the application of supplying water to the concentrated alkali solution from the seawater is remarkably prolonged; the coating uniformly grows on a separation layer of the PTFE hollow fiber membrane, and meanwhile, membrane holes are fully reserved, so that the flux of water vapor is maintained.

The utility model provides a coagulating bath tank for producing a hollow fiber membrane. The coagulating bath tank comprises a bath tank body, a godet wheel group and a partition plate assembly, the godet wheel set comprises a fixed godet wheel and a movable godet wheel, the fixed godet wheel is fixed to the bottom of an inner cavity of the bath body, and the movable godet wheel is slidably connected to the top of the bath body. A plurality of isolation cavities are formed between the partition plate assemblies and the inner cavity wall of the bath body and between every two adjacent partition plate assemblies; according to the coagulating bath, the bath body is divided into a plurality of isolation chambers through the partition plate assemblies, after primary membrane filaments enter the bath body, the membrane filaments are guided to move in the inner cavity of the bath body through the fixed filament guide wheel, the membrane filaments are guided to discharge water through the movable filament guide wheel, and the retention time of a hollow fiber membrane in the coagulating bath is adjusted. The internal space of the bath body can be freely separated by adjusting the partition plate assembly during use, the composition of the coagulating bath can be freely changed or aqueous solutions in different spaces can be independently replaced, the use efficiency of the solutions can be effectively improved, and waste is reduced.

The invention discloses PDRN and a preparation method and application thereof.The base sequence of the PDRN is shown as SEQ ID NO1, and the preparation method of the PDRN comprises the following steps that fermentation treatment is conducted through lactobacillus plantarum, and thalli are collected after an obtained fermentation culture solution is centrifuged; and resuspending the obtained thalli, homogenizing and crushing, centrifuging to remove precipitate, concentrating by using a 5kDa hollow fiber membrane, purifying the obtained concentrated solution by using a Q column, and then concentrating and changing the solution to obtain the high-purity PDRN. According to the method, the PDRN is obtained through fermentation of lactobacillus plantarum for the first time, compared with PDRN sourced from salmon or salmon and the like at present, the method is lower in production cost, and a new way is provided for PDRN production. The PDRN obtained by the method disclosed by the invention is high in purity and single in molecular weight, and experiments prove that the PDRN obtained by the method disclosed by the invention has higher activity in the aspects of promoting cell proliferation, promoting collagen generation and the like.

A hollow fiber flow field separation system used in the method comprises a hollow fiber flow field separation channel, the hollow fiber flow field separation channel is divided into an inner layer and an outer layer and is provided with a three-way port, the outer layer is a silicon dioxide tube, and the inner layer is a silicon dioxide tube; the inner layer is a hollow fiber membrane made of a polyether sulfone material; the plunger pump is communicated with the hollow fiber flow field separation channel so as to pump the flow carrying liquid to flow in the hollow fiber flow field separation channel; the metering valve is communicated with the hollow fiber flow field separation channel so as to control the flow velocity ratio of the inlet and the outlet of the hollow fiber membrane in the focusing process; the valve is communicated with the hollow fiber flow field separation channel, and the switching of the sampling process, the focusing process and the elution process of the carrier liquid in the hollow fiber flow field separation channel is sequentially controlled by changing the flow direction of the channel. The method has the advantages of high anti-interference capability, high purification speed, high separation accuracy, simplicity in operation and the like, and is expected to be used for separating and quantifying polystyrene nanoparticles in complex matrix samples such as environment or biological tissues.

The invention provides a surface coating in-situ modified hollow fiber membrane material and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing a membrane casting solution; preparing a hollow fiber membrane filament precursor from the membrane casting solution through a spinning process; step 2, enabling the hollow fiber membrane filament precursor to sequentially pass through an air gap, a cooling pool and a solvent exchange pool to obtain a semi-finished membrane; the cooling liquid in the cooling pool is an ethylene glycol aqueous solution treated by plasma; and step 3, carrying out surface treatment on the semi-finished product membrane again by utilizing plasma to obtain the hollow fiber membrane with the surface polyethylene glycol coating structure. Components of the cooling liquid are fully utilized, plasma polymerization treatment is combined, in-situ modification is carried out on the surface of the hollow fiber membrane, and the polyethylene glycol coating is rapidly and efficiently formed on the surface of the hollow fiber membrane.

The invention discloses a method and a system for producing high-purity medium-chain fatty acid (MCFA) based on waste molasses two-stage regulation fermentation. Comprising the following steps: (1) diluting waste molasses, then adding a compound enzyme agent of pectinase, beta-glucanase and cellulase, and coupling microwave to assist treatment; (2) inoculating the pretreated waste molasses with a composite flora containing a clostridium kluyveri mutant strain and a Megasphaera elsdeni engineering bacterium, and carrying out a fermentation treatment on the waste molasses, wherein the composite flora contains the clostridium kluyveri mutant strain and the Megasphaera elsdeni engineering bacterium; (3) sequentially performing two-stage dynamic regulation and control fermentation on the waste molasses inoculated with the composite flora through a pH-stat control strategy to realize efficient conversion from butyric acid to hexanoic acid / octanoic acid; and (4) a hydrophobic hollow fiber membrane module is adopted to realize on-line removal of the product, and the inhibition effect of the product is relieved. According to the technology, the yield of the MCFA produced from the waste molasses reaches 0.45 g / g COD, the cost is reduced by 68% compared with that of a traditional substrate, and a new way is provided for recycling of sugar manufacturing waste.

The invention relates to the technical field of sewage treatment, in particular to environment-friendly pollutant treatment equipment for leather production, which comprises a frame, a hollow pipe, a conveying pipe and hollow fiber membrane filaments, the frame is fixedly connected with a plurality of hollow pipes; each hollow pipe is fixedly connected with a conveying pipe, and the two hollow pipes which are opposite to each other up and down are jointly connected with a plurality of hollow fiber membrane filaments; the device further comprises a connecting pipe and the like. Each hollow pipe is communicated with a plurality of connecting pipes; and the hollow fiber membrane filaments are detachably connected with the connecting pipes. When the hollow fiber membrane filaments are suddenly damaged or broken, the connecting pipe is sealed in time through the plugging block under the action of pressurized water flow, external sewage is timely prevented from entering the connecting pipe through the damaged or broken hollow fiber membrane filaments, and serious pollution of pre-purified water caused by the fact that the sewage is not purified is reduced; and serious pollution of a connecting pipe, a hollow pipe, a conveying pipe and an external pump machine is caused.

The application relates to a preparation method of a hollow fiber membrane composite thermal insulation material, which comprises the following steps: adding 18-22% of polyurethane, 4-8% of polyethylene glycol 2000 and 72-76% of N,N-dimethylacetamide into a spinning reaction kettle to mix, stir and defoam to prepare homogeneous casting solution; based on a non-solvent induced phase separation method, the homogeneous casting solution is coated on the surface of a polyester braided tube through a spinneret by adopting a concentric circle composite spinning technology, is gathered on a spinning wheel after a coagulation bath to form a reinforced polyurethane hollow fiber membrane assembly which is arranged in parallel and obliquely crosses and is mutually bonded, and the fiber membrane assembly is hot-pressed to prepare the hollow fiber membrane composite thermal insulation material under the conditions of a temperature of 60-150 DEG C and a pressure of 120-470 MPa. Since the coating layer and the braided tube are both through porous structures, the prepared composite material has good air permeability.

The invention provides equipment and a method for testing permeation filtration performance of a hollow fiber membrane. The equipment comprises a rack, a clamp assembly, a circulating detection system, a control panel, a raw material tank and a wastewater tank, the clamp assembly comprises an upper clamp, a lower clamp, a sealing ring and a driving device; wherein the upper clamp and the lower clamp are provided with cavities for accommodating hollow fiber membrane filaments, so that the upper clamp, the lower clamp and the sealing ring are spliced to form a closed space, and the lower clamp is also provided with two hole channels communicated with the cavities; quick connectors are arranged on two sides of the sealing ring, inlet ends of the hollow fiber membrane filaments are connected with the raw material tank through the quick connectors, and outlet ends of the hollow fiber membrane filaments are connected with the wastewater tank through the quick connectors; the circulating detection system comprises an adsorption separation device, a circulating pump and a detection unit; the adsorption separation device is connected with one hole channel, and the adsorption separation device is sequentially connected with the circulating pump and the detection unit. According to the invention, accurate measurement of the penetration amount of the single hollow fiber membrane silk can be realized.

The invention discloses a membrane bio-membrane reactor and a method for efficiently coupling biogas recycling and denitrification by using the same, and relates to a reactor and a method for recycling and denitrifying biogas by using the same. The invention aims to solve the technical bottleneck problems that the traditional denitrification process depends on an external carbon source and is high in cost, and the existing methane-based membrane bio-membrane reactor cannot fully utilize biogas resources. The invention discloses a membrane bio-membrane reactor. Comprising a biogas high-pressure gas cylinder, a high-pressure gas pressure reducing valve, a reactor main body, a hollow fiber membrane assembly, a reactor main body water outlet, a reactor main body water inlet, a water inlet device, a reflux device, a circulating water outlet, a circulating water inlet, a gas sampling port, a reflux device water outlet, a liquid sampling port, a pH measuring instrument, a water outlet liquid sealing device and an atmosphere communication port. The mechanism of'one source and two purposes' (serving as an electron donor and converting into a carbon source in situ) of biogas methane is the core of realizing efficient denitrification and biogas resource utilization.

The invention relates to the technical field of water treatment equipment cleaning, and discloses a hollow fiber membrane universal cleaning head track intelligent planning method and system. The method comprises the following steps: acquiring membrane bundle installation parameter information to generate three-dimensional position data of an area to be cleaned; calculating an effective cleaning range of a cleaning nozzle to determine a lap joint degree and a track interval; dividing the surface of the membrane cluster into a plurality of sub-regions and sorting the sub-regions according to the distribution density of pollutants; cleaning path coordinate points are calculated based on the effective cleaning range, the lap joint degree and the track interval parameters, and a cleaning track is determined; and converting into a motion control instruction. The membrane surface is accurately and uniformly cleaned, and the cleaning efficiency and quality are improved.

The invention discloses a hollow fiber membrane for treating printing and dyeing wastewater and a preparation method thereof, and relates to the technical field of sewage treatment.The hollow fiber membrane for treating printing and dyeing wastewater comprises a polyether sulfone hollow fiber base membrane, and hydrophilic groups and hydrophobic groups are grafted on the surface and the thickness direction of the polyether sulfone hollow fiber base membrane; the number of the hydrophilic groups positioned on the outer surface of the polyether sulfone hollow fiber base membrane is higher than that of the hydrophilic groups positioned on the inner surface of the polyether sulfone hollow fiber base membrane; the number of the hydrophobic groups positioned on the inner surface of the polyether sulfone hollow fiber base membrane is higher than that of the hydrophobic groups positioned on the outer surface of the polyether sulfone hollow fiber base membrane. The hollow fiber membrane has the effects of improving the removal performance of the hollow fiber membrane on water-soluble dyes and grease impurities in printing and dyeing wastewater and having better durability and self-cleaning performance.

The invention discloses an MOF-based porous liquid modified composite membrane, a preparation method and an application in an ECMO system, the composite membrane comprises a PMP hollow fiber membrane, Pebax and an MOF-based porous liquid material are doped on the PMP hollow fiber membrane, the Pebax comprises a polyamide-polyether block, the MOF-based porous liquid material is doped on the PMP hollow fiber membrane, the Pebax is doped on the PMP hollow fiber membrane, and the MOF-based porous liquid material is doped on the Pebax. The MOF-based porous liquid material comprises UiO-66 of which the surface is grafted with organic silane. The composite membrane shows excellent CO2 / O2 selective adsorption performance in an ECMO system, and has good blood compatibility and biocompatibility at the same time.

The invention discloses a sewage treatment system and treatment method suitable for a plateau low-pressure environment, and the sewage treatment system suitable for the plateau low-pressure environment comprises a first SBR reactor which is provided with a water inlet pipe, a stirrer and a first water decanter; the second SBR reactor is provided with an MABR aeration assembly and a second water decanter; a hollow fiber membrane cavity of the MABR aeration assembly is connected with an air supply unit; the control unit is used for coordinating and controlling the periodic operation of the first SBR reactor and the second SBR reactor, and is used for regulating and controlling the output power of the air supply unit or the valve opening degree according to the real-time monitoring value of the DO sensor in the aeration stage of the second SBR reactor; therefore, the air supply pressure in the membrane cavity of the MABR aeration assembly is dynamically controlled. According to the invention, the limitation of low atmospheric pressure is eliminated, the synergistic interaction of nitrogen removal and phosphorus removal is realized, and the aeration requirement is further reduced.

The invention relates to a preparation method of an inorganic hollow fiber membrane and the inorganic hollow fiber membrane, and the preparation method comprises the following steps: a membrane casting solution preparation process: mixing inorganic powder, an additive, a pore-forming agent and a solvent to prepare a membrane casting solution, 100 parts by mass of the membrane casting solution contains 50-60 parts by mass of the inorganic powder, 5-15 parts by mass of the pore-forming agent, 5-8 parts by mass of the additive and the balance of the solvent; the prepared membrane casting solution forms an inorganic hollow fiber membrane precursor through a spinning technology, organic matters in the precursor are removed through a sintering process, and meanwhile, a uniform pore structure is formed in the membrane by burning off the spherical pore forming agent. And for a metal film in the inorganic hollow fiber membrane, the metal hollow fiber membrane can be obtained by continuously switching to roasting in a reducing atmosphere. The method for producing an inorganic hollow fiber membrane according to the present application can easily produce an inorganic hollow fiber membrane capable of achieving both high porosity and narrow pore size distribution.

A separation system includes a membrane separator. The membrane separator includes a hollow fiber membrane configured to receive two or more fluid streams. The hollow fiber membrane includes a first tubesheet set coupled to a first set of fibers and a second tubesheet set coupled to a second set of fibers. The first tubesheet set and the first set of fibers are configured to transfer one or more components from a first gas stream into a shell side volume. The second tubesheet set and the second set of fibers are configured to transfer the one or more components from the shell side volume into a second gas stream.

The invention belongs to the technical field of degassing membrane degassing devices of nuclear power plants, and discloses an assembly tool and an assembly method for a degassing membrane degassing device of a nuclear reactor. The assembly tool comprises a first tool body, a second tool body and a fastening assembly. Wherein the height of the portion, stretching into the end face of the outer shell, of the first pressing part is larger than the height of the portion, stretching into the end face of the outer shell, of the second pressing part, and the height of the second pressing part meets the requirement that when a final pressing position is reached, the second pressing part is pressed; the length of the part, extending into the outer shell, of the second pressing part is consistent with the length of the part, extending into the outer shell, of the gland assembly of the outer shell. The first tool and the second tool which are matched with each other achieve staged assembly of controllable pre-pressing, ejection ring mounting, symmetrical final pressing and precise centering on sealing assemblies at the two ends of the hollow fiber membrane column in the outer shell, and the good sealing effect is achieved.