55 results about "Oxygen mass transfer" patented technology

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 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 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 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 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 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 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.

The application relates to a distributed sewage treatment facility water quality soft measurement method and system, which comprises the following steps: obtaining an operation electrical signal of a target power equipment in a distributed sewage treatment facility, and analyzing and generating an electrical energy fingerprint data sequence; based on a coupling mechanism of fluid rheology and oxygen mass transfer dynamics, performing decoupling operation on the electrical energy fingerprint data sequence to generate a first physical mechanism feature vector representing fluid physical rheological properties and a second physical mechanism feature vector representing gas-liquid contact surface mass transfer resistance, and then inputting into a preset cross-domain adaptive mapping model for calculation, outputting a target water quality monitoring index, and comparing the target water quality monitoring index with a preset safety threshold to generate an operation and maintenance control instruction for the target power equipment. The application has the advantages that rheology and oxygen mass transfer dynamics characteristics can be separated from the electrical signal, and individual differences of equipment and environmental noise interference can be overcome.

The invention mainly relates to the technical field of hydrogen energy application, in particular to a simulation calculation method and device for an oxygen mass transfer coefficient in a fuel cell catalyst layer. The invention provides a simulation calculation method for an oxygen mass transfer coefficient in a fuel cell catalytic layer. The simulation calculation method comprises the following steps: establishing a fuel cell numerical model based on an aggregate sub-model; based on the numerical model, constructing an iterative algorithm based on a fuel cell polarization curve; setting an oxygen mass transfer coefficient in the catalyst layer as an initial value within a preset value range, calculating based on an iterative algorithm to obtain a corresponding simulated polarization curve, and comparing the simulated polarization curve with a pre-obtained experimental polarization curve to obtain an error value; and based on the obtained error value as a convergence criterion, updating the value of the oxygen mass transfer coefficient through the iterative algorithm until the error value meets a preset threshold value, and outputting the corresponding oxygen mass transfer coefficient. And efficient and accurate calculation of the mass transfer coefficient of oxygen in the ionomer is realized.

The invention provides an ecological purification system based on nano-filtration multi-membrane and nano-microbubble coordinated regulation, which comprises an inferior water desalination unit and a water body micro-nano oxygenation unit, wherein the inferior water desalination unit adopts a stepped first-stage purification tank and a stepped second-stage purification tank, and filtration of a nano-filtration multi-membrane assembly is enhanced through a negative pressure environment and a gravity water head difference; the water body micro-nano oxygenation unit generates micro-nano bubbles through aeration of a Venturi tube, shearing of a multi-stage vane pump and secondary oxygen breaking of a vortex making tube, so that the oxygen mass transfer efficiency is improved; the intelligent control system takes an STM32 single-chip microcomputer as a core and is combined with a solar power supply module, a sensor monitoring module and an execution module to realize automatic cooperative operation. According to the system, the unit energy consumption of purified water is reduced, the oxygen mass transfer efficiency is improved, the nitrogen and phosphorus absorption rate is improved, beneficial minerals are selectively reserved, the treated water quality meets the farmland irrigation standard, the agricultural fresh water resource contradiction can be relieved, and soil secondary salinization and river and lake eutrophication can be prevented and controlled.

The application discloses a method for rapidly removing enrofloxacin in a breeding tail water treatment technology "three pools and two dams" by micro-nano aeration in an aeration tank in cooperation with calcium peroxide, and specifically comprises the following steps: installing a micro-nano bubble generating device, placing the water inlet end of a water inlet pipe and the water outlet end of a water outlet pipe of the micro-nano bubble generating device below the liquid level in the aeration tank, and starting the micro-nano bubble generating device; spraying calcium peroxide; after the aeration tank stably generates micro-nano bubbles, spraying calcium peroxide in the aeration tank to degrade enrofloxacin in the breeding tail water in the aeration tank at a concentration of μg / L level. The breeding tail water is circulated through the micro-nano bubble generating device, a large number of micro-nano bubbles are generated, and the oxygen-producing agent calcium peroxide which is frequently used in breeding management activities is added. The calcium peroxide is non-toxic, can release oxygen when meeting water, can rapidly generate high-activity oxygen in the water body, can increase the dissolved oxygen content of the water body, can generate a large number of free radicals, can improve the oxygen mass transfer efficiency, and can rapidly and effectively remove enrofloxacin in the breeding tail water.

This utility model discloses a heterogeneous catalytic wet oxidation device suitable for coking wastewater treatment, belonging to the field of wastewater treatment. The device mainly includes an equalization tank (1), a dosing device (2), a sedimentation tank (3), a high-pressure pump (4), a wastewater tubular heat exchanger (5), a reaction tower (6), a gas tubular heat exchanger (7), an air compressor (8), a condenser (9), a gas-liquid separator (10), a tail gas treatment device (11), a spray system (12), a nano-catalyst partition (13), and a micro-nano aeration device (14). The high-temperature flue gas from the coking plant is used to heat the air (or other oxygen-containing gas) to achieve waste heat utilization. The nano-catalyst partition utilizes carbon fibers to support nano-catalysts. Micro-nano aeration systems are respectively provided at the bottom and middle of the reaction tower. The oxygen mass transfer efficiency is improved through a graded cross-flow method, which enhances the decomposition of pollutants in the wastewater and effectively improves the pollutant removal efficiency in the wastewater.

The application provides a self-breathing anti-fouling cathode, a preparation method thereof, an electrolytic cell and application thereof, 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, performing first calcination on the mixed solution in a protective atmosphere to obtain an anti-fouling cathode; and performing second calcination on the anti-fouling cathode after spraying a hydrophobic agent on the anti-fouling cathode in an oxygen-containing atmosphere to obtain a self-breathing anti-fouling cathode. The self-breathing anti-fouling cathode can improve the oxygen mass transfer efficiency and inhibit the deposition of Ca 2+ , Mg 2+ and other divalent ions, significantly enhances the hydrogen peroxide generation capacity, and improves the long-term operation stability; on the other hand, the self-breathing anti-fouling cathode has a spatial hydrophobic microenvironment, improves the H2O2 yield without the need of external air ventilation; and the design of the hydrophobic anode reduces the decomposition of H2O2 at the anode, realizes efficient and stable electro-synthesis of H2O2, and is used for pollutant degradation.

The utility model discloses a turbulent flow type aeration treatment device for a sewage treatment tank, and belongs to the technical field of aeration components. The aeration treatment device comprises an aeration disc; the aeration holes are formed in the surface of the aeration disc and are communicated with the interior of the aeration disc; the plurality of upper fan blades obliquely extend to the circle center along the outer ring surface of the aeration disc and are spirally and uniformly distributed at intervals; the connecting column is arranged at the bottom of the aeration disc and is communicated with the inside of the aeration disc; and the base is used for driving the aeration disc to rotate and can input external compressed air into the aeration disc. According to the turbulent flow type aeration treatment device for the sewage treatment tank, when the aeration disc rotates through the arrangement of the upper fan blades, a relatively large turbulent flow effect can be generated, the aeration disc has an impeller form, and when compressed air releases superfine bubbles, the aeration disc actively rotates, so that a bubble group spirally diffuses in a water body, the gas-liquid contact time is prolonged, and the oxygen mass transfer efficiency is improved.

The invention provides an oxygenation device and a sewage nitrification system and method, and relates to the technical field of water treatment. According to the oxygenating device, sewage to be treated and oxygen-containing gas can be mixed in a countercurrent manner, and oxygen mass transfer is improved through hydraulic shearing, so that oxygen is quickly dissolved in water, the retention time of oxygen in water is prolonged, the oxygen dissolving efficiency is improved, oxygenated sewage with high-concentration dissolved oxygen is obtained for nitrobacteria to use, aeration is not needed, and the cost is reduced. Nitrifying bacteria can directly utilize oxygen in oxygenated sewage to carry out nitration reaction, so that the removal efficiency of ammonia nitrogen is improved; moreover, an in-vitro oxygenation mode is adopted, so that the problem of low oxygen mass transfer efficiency caused by direct aeration and oxygenation in the nitration unit is avoided. The oxygenating device provided by the invention is used for oxygenating firstly, so that the problem of bubble dissipation is relieved to a great extent, the energy consumption of nitration reaction is reduced, and the sewage treatment cost is reduced. The method is suitable for a conventional sewage nitration section and can also be used as a control measure for the risk of ammonia nitrogen reaching the standard in sewage in winter.

The application relates to a preparation method of a membrane electrode suitable for a low-humidity working condition, and comprises the following steps: (1) dissolving an ionic liquid in ultrapure water, uniformly dispersing, and obtaining an ionic liquid aqueous solution; (2) uniformly mixing the ionic liquid aqueous solution obtained in the step (1) with a catalyst, coating the ionic liquid on the surface of the catalyst, and cleaning and drying the coated catalyst to obtain an ionic liquid-coated catalyst; (3) uniformly mixing the ionic liquid-coated catalyst obtained in the step (2) with an ionomer and a dispersion solvent, preparing catalyst slurry, and spraying to prepare a cathode catalytic layer; and (4) hot-pressing the cathode catalytic layer obtained in the step (3) and an anode catalytic layer to the two sides of a proton exchange membrane to prepare the membrane electrode. Compared with the prior art, the membrane electrode can ensure efficient proton transmission in the catalytic layer under the low-humidity working condition, realizes wide working condition operation, simultaneously enhances oxygen mass transfer, and improves the battery performance under a large current density.

This invention proposes an oxygen-enriched three-phase photocatalyst based on a superhydrophobic carbon nitride mesh, its preparation method, and its application. The method involves preparing a porous carbon fiber felt substrate through multi-stage ultrasonic cleaning, obtaining a carbon nitride mesh via pyrolysis, and then preparing a nitrogen-vacancy-modified carbon nitride mesh using argon-oxygen plasma etching. A gradient-grafted donor-acceptor composite material is prepared through gas-phase contact modification combined with liquid-phase photolithography and gradient thermopressing bonding, synergistically constructing an oxygen mass transfer channel at the gas-liquid-solid three-phase interface to achieve oxygen-enriched photocatalysis. This invention prepares the gradient-grafted donor-acceptor composite material through gas-phase contact modification combined with liquid-phase photolithography and gradient thermopressing bonding processes, constructing a robust chemical bonding interface on the carbon nitride mesh surface. This significantly enhances the bonding strength between the modified layer and the substrate material, overcoming the problem of easy detachment of the modified layer caused by relying solely on physical adsorption or weak chemical interactions in existing technologies.

The invention provides microporous layer composite powder and a preparation method thereof, microporous layer slurry, a gas diffusion layer, a fuel cell and electric equipment, the microporous layer composite powder comprises porous carbon and oxygen-enriched nanoparticles, and the oxygen-enriched nanoparticles comprise aluminosilicate or silicon-aluminum oxide; the particle size of the particles is 60nm to 100nm; the pore diameter of the porous material ranges from 0.2 nm to 0.8 nm; the ratio of the mass fraction of the oxygen element to the mass fraction of the silicon element ranges from 0.6 to 1.2, the microporous layer composite powder is beneficial to improving the interface oxygen concentration of a microporous layer and an adjacent layer, the oxygen mass transfer process is enhanced, and therefore the output performance of a fuel cell is improved; meanwhile, the water retention capacity of the membrane electrode can be improved, and the problem of performance reduction caused by membrane dryness due to low water content in the air-cooled fuel cell is solved, so that the output performance of the fuel cell is improved, and the service life of the cell is prolonged.

The invention discloses an organic wastewater treatment device and method based on a photosynthetic microbial fuel cell, the device comprises a light-transmitting shell, the middle part of the light-transmitting shell is fixedly connected with a closed partition plate, and the middle part of the closed partition plate is in rotary threaded connection with a separation membrane frame; by integrating the stirring blades and the reciprocating stirring assembly, the system forms a composite flow field in the cathode chamber, gas, liquid and solid interface mass transfer boundary layers are effectively destroyed, the distribution uniformity of dissolved oxygen and the material exchange efficiency among microalgae, a solution and electrodes are remarkably improved, the oxygen mass transfer process is further enhanced in combination with microbubbles released by the aeration assembly, and the aeration efficiency is improved. An optimal reaction environment is created for photosynthesis of microalgae, and a microalgae biological membrane is driven to continuously rotate by adopting a driving rotating shaft, so that the contact frequency and the mass transfer efficiency of the microalgae, air and cathode liquor are enhanced, and the electricity generation efficiency of the device is improved.