77 results about "Oxygen mass transfer" patented technology

The invention provides a sewage treatment aeration control system and method based on multi-parameter collaborative optimization. The method comprises the following steps: acquiring multi-sensor data of COD (Chemical Oxygen Demand), BOD5 (Biochemical Oxygen Demand), DO (Dissolved Oxygen Demand), ammonia nitrogen, ORP (Oxidation Reduction Potential), pH (Potential of Hydrogen), water inlet flow and sludge concentration of wastewater in an aeration tank by utilizing a multi-parameter sensor module; according to the dynamic correction oxygen mass transfer coefficient and the feedforward parameter, establishing a relationship between the water inlet load and aeration; calculating the air volume of an air blower and the fine adjustment value of the opening degree of a butterfly valve through a PID control algorithm and feedback parameters, and correcting the aeration quantity to obtain a total air volume target value; and adjusting the opening degree and the rotating speed of a guide vane of the air blower according to the self-adaptive PID control parameters and the corrected total air volume target value by utilizing a self-adaptive PID controller, and adjusting the opening degree of a butterfly valve according to a gradient butterfly valve adjusting strategy. The output of the air blower is optimized by adopting self-adaptive PID, and the opening degree of the butterfly valve of each biological tank is dynamically adjusted through a gradient valve adjusting strategy, so that the accurate control of the aeration rate is realized; the sewage treatment effect is ensured.

The invention relates to a membrane electrode with high oxygen permeability and a preparation method thereof, the membrane electrode comprises a proton exchange membrane, an anode catalyst layer and a cathode catalyst layer, the anode catalyst layer and the cathode catalyst layer are arranged on two sides of the proton exchange membrane, and anode catalyst slurry comprises an anode catalyst, an ionomer and a dispersing solvent in a mass ratio of 1: (1-10): (10-1000); the cathode catalyst slurry comprises a cathode catalyst, an ionomer, an ionic liquid and a dispersing solvent in a mass ratio of 1: (1-10): (1-10): (10-1000). Compared with the prior art, in order to solve the problem that oxygen mass transfer of a porous carbon carrier in a fuel cell catalyst layer is difficult, the method that ionic liquid and ionomer are mixed in advance, then slurry is prepared, and the slurry is sprayed to prepare the membrane electrode is adopted, so that a compact structure formed by an ionomer membrane on the surface of a catalyst is weakened, and the distribution uniformity of the ionomer membrane is improved; the local oxygen mass transfer resistance is obviously reduced, and the performance of the fuel cell under high current density is improved.

The invention relates to the technical field of air electrode preparation, in particular to a metal-loaded super-hydrophobic air electrode, a preparation method and chlorine production application, the air electrode comprises a high-hydrophobicity gas diffusion layer obtained through polytetrafluoroethylene modification, and the metal-loaded super-hydrophobic air electrode is prepared through a corona etching and electrochemical in-situ deposition technology. A uniform and highly-dispersed metal catalyst layer directly grows on the surface of the polytetrafluoroethylene substrate, so that the gas diffusion electrode with excellent mass transfer performance and an efficient catalytic function is obtained; the prepared electrode is used for carrying out electrochemical catalysis on a water body containing chloride ions by adopting a cyclic voltammetry method, and active chlorine can be efficiently generated in situ; the prepared metal-loaded super-hydrophobic air electrode has the advantages of being low in oxygen mass transfer resistance, high in catalyst utilization rate, free of generation of by-products, capable of efficiently generating active chlorine and the like, and has wide application potential in actual water environment disinfection.

The present invention relates to a method for removing organic pollutants in water by activating sulfite with Fe-N-C, belonging to the technical fields of new catalyst materials and environmental purification technologies. An iron salt and a carbon-nitrogen precursor are added to an organic solvent, and the iron salt and the carbon-nitrogen precursor form a complex. Then, the organic solvent is removed to obtain a dry powder. The dry powder is calcined under a protective atmosphere, and after carbonization, an Fe-N-C catalyst is obtained. The present invention solves the bottleneck problem of low efficiency in traditional heterogeneous sulfite activation technology due to few reactive sites and slow oxygen mass transfer by constructing carbon-based metal active sites with oxygen-rich properties. This catalytic oxidation method has high treatment efficiency and simple operation, has a wide pH application range, strong anti-ion interference ability, and high reusability, and has broad application prospects in the field of actual industrial wastewater treatment.

The invention discloses a column type membrane assembly aiming at MABR. The assembly comprises an upper end gas inlet membrane shell and an upper fixing plate, a lower fixing plate and a lower end tail gas collecting membrane shell, a supporting pull rod supported between the upper fixing plate and the lower fixing plate, and a bunchy villus type hollow membrane arranged between the upper fixing plate and the lower fixing plate. Two ends of the hollow film are filled with glue to form a through gas path; and the upper-end gas inlet membrane shell and the lower-end tail gas collecting membrane shell are provided with upper and lower aeration pipes. The overall three-dimensional layout is adopted, the distribution density of the membrane filaments in unit volume is improved, and compared with a curtain type structure, the membrane area is increased, and the volume requirement of a pool body is reduced; the hollow membrane optimizes the diffusion path of oxygen from a gas phase to a liquid phase, the oxygen mass transfer efficiency is improved, oxygen is almost fully utilized, and the aeration energy consumption is reduced; the outer-layer fluff structure provides a large specific surface area, so that attachment growth of microorganisms is facilitated, and the wastewater treatment efficiency is improved; the pulse aeration at the center of the column body fully aerates and washes the surface of the membrane, so that the aged biological membrane is stripped, and the membrane pollution is effectively retarded.

The invention discloses a carbon-coated platinum-based catalyst for a fuel cell and a preparation method thereof, and the preparation method comprises the following steps: dispersing a carbon carrier and a surfactant in a water-alcohol solution to obtain a carbon carrier solution; preparing a platinum-containing precursor solution; the mass of platinum in the platinum-containing precursor is 30-70% of the mass of the carbon carrier; mixing the carbon carrier solution and the platinum-containing precursor solution, and removing the solvent to obtain platinum-loaded carbon carrier particles; immersing the platinum-loaded carbon carrier particles into a weakly alkaline buffer solution, and adding dopamine hydrochloride to form polydopamine to coat the surfaces of the platinum-loaded carbon carrier particles; the reaction product is placed in reducing gas for carbonization treatment, and the carbon-coated platinum-based catalyst is obtained. According to the prepared catalyst, the poisoning effect of sulfonic acid groups of ionomers on Pt is avoided, the problem of large oxygen mass transfer resistance is solved, and stable electric energy output provided by a fuel cell is facilitated.

The invention relates to the technical field of sewage treatment, in particular to an aeration process quantitative evaluation method and system based on a multi-region mass transfer model. The aeration process quantitative evaluation method based on the multi-region mass transfer model comprises the following steps: S1, based on a physical structure and an operation mechanism of an aeration system, dividing the total volume involved in the aeration process into at least two physical regions with independent mass transfer characteristics in space; s2, determining key physical parameters of the oxygen mass transfer process based on the physical region, wherein the key physical parameters comprise equilibrium dissolved oxygen concentration; s3, calculating the oxygen transfer rate of the corresponding physical area based on the key physical parameters; s4, arithmetic addition is conducted on the oxygen transfer rates calculated in all the physical areas, the total oxygen transfer rate of the aeration system is obtained, the total oxygen transfer rate is the final quantitative evaluation result of the aeration process, and aeration can be accurately controlled through the total oxygen transfer rate.

The invention discloses a bimetallic rare earth MOF (Metal Organic Framework) catalyst and an application method of the bimetallic rare earth MOF catalyst in preparation of hydrogen peroxide. Ce < 3 + > is directionally doped to an MIL-100 (Mn) skeleton through a modification method to form an octahedral microporous crystal (Mn1Ce2) MOF catalyst with a certain Mn / Ce molar ratio. When the molar ratio of Mn to Ce is 1: 2, the BET specific surface area of the (Mn1Ce2) MOF catalyst is 560 m < 2 > / g. The catalyst is in the presence of visible light ([lambda] gt; under the ozone atmosphere (420 nm) and 700 ppb, the yield reaches 1602 [mu] mol.g <-1 >. H <-1 > (pure water system), the activity is kept at 87.1% after five times of circulation, and the problems that a traditional photocatalytic system is low in oxygen mass transfer efficiency and needs a sacrificial agent are solved.

The invention discloses a hydrophobic catalyst as well as a preparation method and application thereof. The preparation method of the hydrophobic catalyst comprises the following steps: sequentially carrying out ultrasonic treatment and rotary evaporation on a mixture of a Pt-based catalyst, an ionic liquid and an organic alcohol solvent to prepare the hydrophobic catalyst, the ionic liquid is 1-butyl-3-methylimidazole bis (trifluoromethanesulfonyl) imide, and the ionic liquid is 1-butyl-3-methylimidazole bis (trifluoromethanesulfonyl) The surface of the Pt-based catalyst is uniformly coated with the ionic liquid, and when the prepared hydrophobic catalyst is further applied to an electrode, a hydrophobic microenvironment can be formed, interface water can be repelled, and blockage of a Pt active center is avoided; the catalytic activity of the ORR process is improved, the oxygen mass transfer capacity is improved, the oxygen solubility is increased, and the performance of the membrane electrode is improved. The preparation method is simple and convenient, and is suitable for commercial application of PEMFC.

The invention relates to the technical field of sewage treatment, and discloses a gradually-decreasing aeration and mechanical stirring coupled plug-flow type aeration device which comprises a plug-flow type aeration device body, an air distribution main pipe and aeration branch pipes are installed in the plug-flow type aeration device body, and the installation density of the aeration branch pipes is gradually decreased along the way of the plug-flow type aeration device body; the air blower is connected with the air distribution main pipe; the gas flow meter is mounted on the gas distribution main pipe; the microporous aerators are mounted on the aeration branch pipes; and the stirring system is mounted at the middle-rear section of the aeration tank with insufficient aeration stirring effect, and is used for enhancing the stirring effect to keep the activated sludge mixed liquid in a suspended state and enhancing the oxygen mass transfer efficiency. According to the present invention, the aeration rate is accurately controlled through the gradually-reduced aeration mode according to the oxygen demand of the sewage at different positions of the plug-flow type aeration device, such that the excessive aeration at the rear section in the traditional aeration mode is avoided, the power consumption is effectively reduced, the energy saving purpose is achieved, and the biochemical system can stably operate.

The invention provides a self-breathing anti-scaling cathode, a preparation method, an electrolytic bath and application of the electrolytic bath, and belongs to the technical field of electrochemical electrodes. The preparation method comprises the following steps: mixing a carbon substrate and a catalyst precursor solution, and carrying out first calcination on the mixed solution under a protective atmosphere to obtain an anti-scaling cathode; and the anti-scaling cathode is sprayed with a water repellent agent and then subjected to second calcination in an oxygen-containing atmosphere, and the self-breathing type anti-scaling cathode is obtained. On one hand, the oxygen mass transfer efficiency is improved through the self-breathing anti-scaling cathode, deposition of divalent ions such as Ca < 2 + > and Mg < 2 + > is inhibited, the generation capacity of hydrogen peroxide is remarkably enhanced, and the long-term operation stability is improved; on the other hand, a spatial hydrophobic microenvironment is provided, and the yield of H2O2 is increased under the condition that external air ventilation is not needed; meanwhile, due to the design of the hydrophobic anode, decomposition of H2O2 at the anode is reduced, and efficient and stable electrosynthesis of H2O2 for pollutant degradation is realized.

The application discloses a combined biological ball filler for sewage treatment, which comprises an outer frame body and a filler, the outer frame body is a hollow sphere, the filler is filled in the inner part of the outer frame body, the filler is aldehyde fiber silk, one end of the aldehyde fiber silk is fixed to the inner surface of the outer frame body, and the spherical surface of the outer frame body is a sawtooth structure with a hollow design. Compared with the prior art, the sawtooth grid shell is adopted, the sawtooth hollow design can achieve the purpose of uniform water and gas distribution, water and gas can be fully exchanged in the biological membrane, and organic matters in water can be efficiently treated. Meanwhile, the aldehyde fiber silk is arranged in the filler ball, and one end of the aldehyde fiber silk is fixed to the inner surface of the biological ball, so that the problems, such as too dense biomass on the surface of the filler, poor oxygen mass transfer in the biological membrane and influence on biological activity, are solved.

The present invention belongs to the technical field of metallurgical automation, and provides a fully automatic demoulding and sampling system for molten steel in a blast furnace, comprising a flow pivot modeling, an oxygen field cloud map, an offset decision and a sample optimization module; the flow pivot modeling module acquires data such as molten steel flow rate and temperature, and combines CFD to construct a flow pivot mapping model to obtain an initial optimal sampling point; the oxygen field cloud map module introduces an oxygen mass transfer equation, and outputs a cloud map of oxygen content distribution in the furnace and the oxygen content at the initial optimal sampling point; the offset decision module determines whether to offset based on the oxygen content, obtains an oxygen-containing offsettable area and optimizes the target offsettable area; the sample optimization module selects the optimal sample through multiple samplings in combination with the offset amount and oxygen content; the present invention improves sampling accuracy, reduces the risk of defects caused by excessive oxygen, and is suitable for intelligent blast furnace molten steel sampling scenarios.

The invention relates to a method for removing antibiotics in a water body based on iron-nitrogen co-doped mesoporous carbon activated peroxymonosulfate (PMS). The method comprises the following steps: mixing microalgae powder and glucose, and carrying out hydrothermal reaction to obtain a nitrogen-doped biochar precursor; the preparation method comprises the following steps: carrying out solvothermal reaction on ferric salt and terephthalic acid in DMF (Dimethyl Formamide), and carrying out centrifugal separation, alcohol washing and drying to obtain a metal organic framework (Fe-MOF); and the nitrogen-doped charcoal precursor and Fe-MOF are mixed and pyrolyzed to obtain the iron-nitrogen co-doped mesoporous carbon catalyst. The catalyst provided by the invention is low in production cost, high in porosity, rich in pyridine nitrogen and rich in gradient pore size in the range of 10-50nm, antibiotic molecules can be in full contact with active sites, oxygen mass transfer is fast, the PMS activation capability can be remarkably improved, and the degradation efficiency is promoted. When the catalyst is used for activating PMS to degrade tetracycline, the removal rate reaches 86% within 60 min, the catalyst can be separated through a simple external magnetic field, the removal rate still reaches 61% after five times of circulation, and good circulation stability is shown.

The invention discloses a portable oxygen mass transfer efficiency measuring system which comprises a gas collecting hood connected with a gas monitoring module; the rod body is connected with the gas collecting hood and is arranged at the lower part of the rod body; the gas collecting hood comprises a supporting rod, a connecting rod hinged to the supporting rod and a cloth piece arranged outside the supporting rod, the upper end of the supporting rod is hinged to the sliding sleeve, the rod body slides along the sliding sleeve, and one end of the connecting rod is installed on the rod body in a hinged mode. A reset spring is arranged between the rod body and the sliding sleeve. A balancing weight is arranged on the rod body in a sliding mode, and the sliding sleeve moves downwards through sliding of the balancing weight. And a limiting frame is arranged on the rod body. A connecting part is arranged on the rod body and is used for assembling a plurality of rod bodies. The rod body is of a telescopic rod structure. The problems that an existing test point is small in size, and gas collection is inconvenient are solved.

The application belongs to the technical field of fuel cell membrane electrode, and specifically discloses a porous cathode electrode preparation method based on pore forming by bubble precipitation. The preparation method comprises the following steps: step 1, preparing a conventional cathode catalyst layer; step 2, assembling an electrolysis electrode structure; and step 3, electrolyzing the cathode catalyst layer, and controlling the gas distribution on the ionomer film and the pore structure of the catalyst layer generated by the catalytic site. The application controls the bubble precipitation of the catalytic site, forms pores on the ionomer film and the electrode pore structure, controls the ionomer distribution, increases the catalyst layer pores, increases the transmission channel of oxygen molecules in the catalyst layer to the catalytic site, and reduces the local and bulk mass transfer resistance of oxygen. The new porous electrode structure as a proton exchange membrane fuel cell cathode, and the proton exchange membrane and the anode form an efficient oxygen mass transfer membrane electrode, and has a wide application prospect.

The present invention discloses an oxygen reduction catalyst with a controllable multi-level pore structure and its preparation method and application. The preparation method comprises the following steps: mixing an organic acid magnesium salt with a metal phthalocyanine to obtain a mixed powder; subjecting the mixed powder to Joule pulse heat treatment under an inert atmosphere; immersing the product in an acid solution, stirring, filtering, and drying to obtain. The present invention uses metal phthalocyanine as a metal source, a nitrogen source, and a portion of a carbon source, and uses millisecond-level Joule pulse heat to avoid the agglomeration of metal atoms under continuous high temperature conditions; magnesium citrate is used as a carbon source, and a large number of micropores are generated after heat treatment, and hydrochloric acid is used to etch the size-controllable magnesium oxide template generated in situ to generate mesopores; the multi-level pores of micropores and mesopores are combined to expose the active sites to the greatest extent, reduce the oxygen mass transfer resistance, and enable oxygen to be smoothly transmitted to the active sites in the pores, thereby achieving a high electrochemical active area and oxygen reduction half-wave potential of the oxygen reduction catalyst.

The application provides an integrated membrane electrode and a preparation method thereof and a device for directional reduction and oxidation regulation synthesis of hydrogen peroxide of anthraquinone derivative compounds, and relates to the technical field of electrocatalysis. The preparation method of the integrated membrane electrode comprises the following steps: mixing a cathode catalyst, a first perfluorosulfonic acid resin solution and a first mixed solvent to obtain a cathode catalyst slurry; mixing an anode catalyst, a second perfluorosulfonic acid resin solution and a second mixed solvent to obtain an anode catalyst slurry; and spraying the cathode / anode catalyst slurry on both sides of a proton exchange membrane respectively to obtain the integrated membrane electrode. The membrane electrode is used in the device for directional reduction and oxidation regulation synthesis of hydrogen peroxide of anthraquinone derivative compounds, water is used as a hydrogen source without using hydrogen, the steam methane reforming process with large scale and high energy consumption is avoided, hydrogen is added in a directional manner, hydrogen peroxide is generated by re-oxidation, and the hydrogen peroxide is not affected by oxygen mass transfer; and the device has the advantages of small reactor area, short process, no secondary pollution and the like.

The present invention discloses a numerical simulation method for solid-state oxygen control and mass transfer of liquid lead-bismuth, which can be used for numerical simulation research on the oxygen dissolution and diffusion characteristics of solid lead oxide particles in a mass exchanger during solid-state oxygen control of liquid lead-bismuth. By studying the oxygen supply characteristics of a randomly stacked pebble bed composed of solid lead oxide particles in a mass exchanger, the lead oxide pebble bed is simplified into a homogeneous porous medium, and a porous medium component transport model can be used to complete the numerical simulation of solid-state oxygen control. The present invention avoids the modeling difficulties of simplifying point contacts between lead oxide particles in current public literature, has the characteristics of low computing resource usage and high result reliability, and can be used for preliminary research on solid-state oxygen control experiments of liquid lead-bismuth, which is beneficial for guiding the design of solid-state oxygen control equipment in lead-bismuth piles of fourth-generation reactors.

The invention belongs to the technical field of proton exchange membrane fuel cells, and particularly relates to a method for improving membrane electrode performance of a fuel cell through ionomer heat treatment. According to the method, the ionomer in the catalyst layer is subjected to heat treatment for 120-240 minutes at the temperature of 100-120 DEG C, so that ether bonds in ionomer molecules are broken, hydrophilic sulfonic acid branched chains are reduced, and the hydrophobicity of the catalyst layer is enhanced. Compared with the prior art, the membrane electrode treated by the method disclosed by the invention shows remarkably improved drainage capacity and oxygen mass transfer performance, the problem of water logging under high current density is effectively relieved, and the output performance and operation stability of a battery in a large current area are remarkably improved. The method does not need to change the existing material system and production process, and is simple and convenient to operate, low in cost and suitable for large-scale application.

The present application provides a kind of wastewater treatment aeration control system and method based on multi-parameter collaborative optimization, the present application utilizes multi-parameter sensor module to collect the multi-sensor data of COD, BOD5, DO, ammonia nitrogen, ORP, pH, influent flow, sludge concentration of wastewater in aeration tank;And according to the relationship between dynamic correction oxygen mass transfer coefficient and feedforward parameter, establish influent load and aeration;Through PID control algorithm and feedback parameter, the fine tuning value of blower air volume and butterfly valve opening is calculated, and the total air volume target value is obtained by correcting the aeration amount;Using adaptive PID controller, according to the adaptive PID control parameter and the total air volume target value corrected, the guide vane opening and speed of blower are adjusted, and according to the gradient butterfly valve adjustment strategy, the butterfly valve opening is adjusted.The present application uses adaptive PID to optimize blower output, and dynamically adjusts the butterfly valve opening of each biological tank through gradient valve adjustment strategy, realizes precise control of aeration amount;Ensure the effect of wastewater treatment.

This invention belongs to the field of aerobic biochemical technology, specifically relating to a liquid-gas jet injector, including an air inlet pipe, a liquid inlet pipe, an air intake tank, a jet nozzle, a throat, a guide tube, and a mixer. A first channel is provided between the outlet of the nozzle and the first jet port of the air intake tank, allowing air to be drawn into the first jet port through the first channel. The throat is connected to the first jet port. A second channel is provided between the outlet of the throat and the guide tube to facilitate the intake of liquid flow to form a second gas-liquid mixture. The throat is used for the first gas-liquid mixing and transport, and the mixer is used for the mixing and transport of the second gas-liquid mixture. The gas-liquid mixture at the outlet of the mixer comes into contact with the liquid in the liquid pool, forming a third oxygen transfer. This solution achieves three-stage oxygen mass transfer between gas and liquid, overcoming the limitation of the optimal 1:1 mass transfer ratio of air to liquid in the throat; it ensures thorough mixing of gas and liquid, avoiding the drawbacks of localized high dissolved oxygen; and it improves the oxygen transfer efficiency between gas and liquid.

The invention discloses a layered water body deepwater aeration and gas circulation synergistic interaction system and method, and relates to the technical field of water environment in-situ ecological restoration. The system is based on a coaxial sleeve structure, an outer-layer flow channel drives a deep-layer water body to lift by utilizing an airlift effect generated by compressed air, and an inner-layer flow channel is used for reinjecting an oxygen-enriched water body to a deep water layer. An inverted bell-jar-shaped gas-liquid separation cabin is arranged at the top of the device, bubble separation is achieved by means of flow velocity attenuation and the Stokes sedimentation principle, and a gas cavity with pressure potential energy is formed through accumulation. A spiral guide vane is arranged at an inlet of the inner pipe, downward water flow is converted into strong rotational flow, a Rankine vortex negative pressure area is constructed, and gas accumulated on the top is passively sucked into a downward flow channel through the pressure difference between a gas cavity and a vortex core. Through gradient utilization of fluid energy and active fine control of a flow state, the oxygen mass transfer efficiency is remarkably improved without additional energy consumption, a natural thermal stratification structure of a water body is strictly maintained, and resuspension of bottom mud is prevented.

The invention relates to an oxygen reduction catalyst for constructing a local oxygen-enriched microenvironment as well as a preparation method and application of the oxygen reduction catalyst, and belongs to the technical field of catalyst material synthesis. The preparation method of the oxygen reduction catalyst for constructing the local oxygen-enriched microenvironment comprises the following steps: (1) dissolving an NC carrier, Fe salt and rare earth metal salt with oxygen enrichment capacity in deionized water, and fully grinding to obtain a Fe-MOx / NC precursor material; and (2) performing in-situ carbon conversion on the Fe-MOx / NC precursor material through pyrolysis to obtain the oxygen reduction catalyst Fe-MOx / NC for constructing a local oxygen-enriched microenvironment in natural seawater. The core of the invention is to synthesize a catalyst with oxygen enrichment capacity, so that a local oxygen-enriched microenvironment is constructed, and the challenge that oxygen mass transfer is limited in an oxygen-deficient seawater environment is overcome, so that the stability and activity of the catalyst in a real marine environment, especially under an oxygen-deficient condition, are remarkably improved, efficient and stable oxygen reduction is realized, and the service life of the catalyst is prolonged. And practical development of the seawater metal-air battery is promoted.

The utility model discloses a bipolar plate for producing hydrogen by electrolyzing water and an electrolytic bath. The bipolar plate comprises a plate body, a jet flow micro-channel network is arranged on the anode side surface of the plate body and comprises a plurality of groups of jet flow micro-channel units which are arranged at intervals in the width direction of the plate body; the jet flow micro-channel unit comprises a main flow channel, a plurality of first-stage branch flow channels and a plurality of last-stage branch flow channels which are arranged in the length direction of the plate body, the main flow channel is a through hole of which the two ends are communicated with the water inlet area and the water outlet area respectively, and the first-stage branch flow channels and the last-stage branch flow channels are blind holes of which one ends are communicated with the main flow channel and the first-stage branch flow channels and the other ends are closed; a plurality of jet flow holes are formed in the top of the last-stage branch flow channel at intervals in the length direction of the last-stage branch flow channel. The jet flow micro-channel network adopts a vein bionic structure layout, so that the water-membrane contact efficiency is improved, the problems that a water / oxygen mass transfer boundary layer is thick, laminar flow is formed in a channel and the contact with the surface of a proton exchange membrane is insufficient and the like can be well solved, and the hydrogen production efficiency is improved.

The present subject matter discloses a bioreactor apparatus. The bioreactor apparatus comprises a bioreactor vessel configured to culture cells. The bioreactor apparatus furthermore comprises a sensor configured to measure Dissolved Oxygen (DO) in the bioreactor vessel. The DO measurements comprise a plurality of DO values recorded at, at least, a plurality of time instances during operation of the bioreactor apparatus. The bioreactor apparatus furthermore comprises a controller configured to obtain the DO measurements. The controller furthermore is to determine, in real-time or approximately real-time, an oxygen mass transfer co-efficient (kLa) associated with the operation of the bioreactor apparatus. Furthermore, the controller is configured to control, in real-time or approximately real-time, at least one cell culture parameter associated with the operation of the bioreactor apparatus based on the kLa.

The invention provides a modified catalyst and a preparation method thereof, a membrane electrode, a fuel cell and application, the modified catalyst comprises a catalyst matrix and a modified layer loaded on the outer surface of the catalyst matrix, the catalyst matrix is a Pt / C catalyst, and the structural formula of the material of the modified layer is SiO2-(CH2) 3SH. By adopting the modified catalyst provided by the invention, on one hand, when the modified catalyst is applied to a membrane electrode, the coverage of an ionomer on catalyst nanoparticles can be reduced, so that active sites of the catalyst are increased, and the catalytic performance is improved; and on the other hand, the local oxygen mass transfer resistance in the cathode catalyst layer can be greatly reduced, so that the cathode catalyst layer has better catalytic activity and mass transfer rate, and the comprehensive performance is better.

The present application relates to a kind of special industrial wastewater treatment for lifting type fiber composite aeration system, comprising: fiber fabric tubular aerator, gas supply pipe, high-pressure hose, support and lifting device;Fiber fabric layer adopts microporous (10-50 μm) structure, combined with the composite material of inner core (aramid) and coating layer (polyurethane);Lifting device (guide rail-winch-sliding device) can be lifted to multiple layers of support whole and time-consuming is short.The beneficial effects of the present application are: efficient oxygen mass transfer can be carried out and energy consumption is low;Excellent anti-blocking performance and can be self-cleaning;With strong durability and environmental adaptability;Convenient maintenance and can be flexibly adjusted;Efficiently cover aeration tank, wastewater aeration effect is good;It can maintain efficient operation in extreme environment, can reduce the number of downtime cleaning, especially suitable for high pollution load industrial wastewater treatment.

The invention relates to the field of sewage treatment process control methods, in particular to an urban sewage treatment accurate aeration modeling method based on knowledge assistance, which comprises the following steps: establishing a data driving model according to acquired aeration process key data; based on an oxygen mass transfer-reaction coupling mechanism model, directional mining of key data in the aeration process is guided, knowledge extraction is carried out, new characteristic parameters associated with the aeration process are calculated, and a multi-dimensional characteristic matrix is formed; and jointly using the newly added multi-dimensional feature value and the original aeration process key data for training and optimization of a data-driven model to obtain an aeration model based on knowledge assistance. According to the method, knowledge and data are deeply fused, directional mining of data depth features is guided by the knowledge, and a good aeration simulation control effect is achieved based on defect data conditions.

The utility model relates to the technical field of sewage treatment, and discloses a standard oxygen mass transfer efficiency and alpha value measuring device in a process state, which comprises a base, an aeration tank is fixedly connected to the middle of the top end of the base, a first motor is fixedly connected to the middle upper part of the rear side of the left wall of the aeration tank, and a groove is formed in the middle upper part of the inner side of the aeration tank; the output end of the first motor penetrates through the aeration tank and is fixedly connected with a transmission rod, worms are fixedly connected to the left side and the right side of the outer wall of the transmission rod, threaded rods are rotationally connected to the left side and the right side of the interior of the groove, and worm wheels are fixedly connected to the rear sides of the outer walls of the two threaded rods. According to the utility model, the second motor drives the horizontal gear to rotate, and the horizontal gear is meshed with the rack, so that when the horizontal gear rotates, the horizontal gear drives the supporting seat to slide left and right on the supporting frame, different positions of the aeration tank can be detected, and the standard oxygen mass transfer efficiency and the alpha value in an actual process state can be effectively measured.