143 results about "Catalytic ozone" patented technology

The invention discloses a method for degrading polystyrene (PS) plastic and upgrading and recycling the PS plastic into benzoic acid based on nano MnO2 photocatalytic ozonation, and belongs to the technical field of solid waste recycling. The method comprises the following steps: firstly, mixing PS plastic fragments with nano MnO2 and an organic solvent, then simultaneously introducing ozone into a reaction system at normal temperature and normal pressure, and irradiating with light. Through synergistic catalysis of light and ozone, molecular chains of the PS plastic can be efficiently and selectively broken and oxidized, and finally the PS plastic is directionally converted into benzoic acid with high additional value. After the reaction is finished, a benzoic acid product can be obtained through simple separation, concentration and purification steps. The method provided by the invention realizes high-valued recycling of the waste PS plastic under mild conditions, solves the problems of high energy consumption, complex products, easy generation of secondary pollution and the like in a traditional treatment method, and has the outstanding advantages of green process, efficient reaction, high product value and the like.

The invention relates to the field of water treatment, and particularly discloses a method for preparing a catalyst based on Fenton iron sludge and activated sludge, the prepared catalyst and application, the method comprises the following steps: S1, crushing and sieving Fenton iron sludge, activated sludge and a binder; s2, mixing the sieved Fenton iron mud, activated sludge and binder with a pore-forming agent and carbon powder, and then adding a transition metal salt solution to prepare a primary mixture; s3, the primary mixture is dried after being formed, a blank is formed and then subjected to pyrolysis treatment, and the catalyst is prepared; the invention also discloses the catalyst prepared by the method and application of the catalyst in water treatment. According to the application, resource utilization of the Fenton iron sludge and the activated sludge is realized, the problem of enrichment of organic matters and heavy metals in wastewater in a current Fenton iron sludge resource technology is solved, the prepared catalyst can be used for catalyzing ozone, hydrogen peroxide or persulfate to degrade the organic matters in the wastewater, and the preparation method of the catalyst is simple.

The invention discloses a preparation method and application of a nickel-doped lead dioxide ozone catalytic anode, a titanium substrate is used as an anode, a titanium sheet is used as a cathode for anodic oxidation, an obtained titanium dioxide nanotube array is used as an anode, a titanium sheet is used as a cathode for secondary anodic oxidation, and the nickel-doped lead dioxide ozone catalytic anode is obtained. And putting the obtained titanium dioxide nanotube array electrode of the new oxide layer into a tubular furnace, calcining in an air atmosphere, taking the titanium dioxide nanotube array electrode of the transition layer as a cathode, taking a titanium plate as an anode, and performing electrochemical reduction in a formic acid solution to obtain the titanium dioxide nanotube array electrode of the transition layer. The obtained electrode with the high-conductivity titanium dioxide nanotube array transition layer serves as an anode, a titanium sheet serves as a cathode, electrodeposition is carried out in an acid electrodeposition solution to obtain a beta-PbO2 layer, and finally the Ti / TNAs / Ni-PbO2 anode is prepared, the anode is high in stability and long in service life and can work for a long time without affecting the catalytic activity of the anode, and the application range of the Ti / TNAs / Ni-PbO2 anode is wide. The method has a certain application prospect in the aspect of electro-catalytic ozone treatment of organic wastewater.

The invention discloses a catalytic ozonation water treatment method for regulating and controlling the structural characteristics of MXene by carbon nitride, MXene is used as a matrix, carbon nitride is introduced by a one-step pyrolysis method, the prepared catalyst can increase the interlayer spacing of MXene to 1.41 nm and improve the layer structure ozone molecule transmission capability and contact area, the Raman ID / IG value is increased from 0.87 to 1.23, the carbon defect is increased, and the water treatment effect is improved. And more reaction active sites are provided. When the catalyst is used for catalyzing an ozone oxidation system to deeply treat pharmaceutical tail water, under the conditions that the ozone concentration is 5-20 mg / L, the catalyst dosage is 50-200 mg / L, the pH is 4.0-10.6 and the like, the ibuprofen removal rate can be increased to 90.1% from 28.0%, and efficient degradation of trace organic matter is achieved. The catalyst is simple and environment-friendly in preparation process, is a solid and is easy to recover, environmental pollution is reduced, and the catalyst has a good application prospect.

A power plant desulfurization wastewater treatment method belongs to the technical field of water treatment. The method comprises the following steps: S1, pretreatment of the desulfurization wastewater: adding a coagulant and a polymer coagulant aid to remove suspended solid particles in the desulfurization wastewater to obtain pretreated effluent; s2, collecting sludge generated by pretreatment; s3, feeding the desulfurization wastewater into an ozone catalytic reactor, and catalyzing ozone oxidation by using a heterogeneous solid catalyst to remove ammonia in the desulfurization wastewater; s4, adding calcium sulfate seed crystal and desulfurization wastewater, uniformly mixing in a seed crystal mixer, and feeding into a triple-effect circulating evaporation concentrator; s5, allowing the concentrated solution desulfurization wastewater to enter a crystal collection tank for precipitation, discharging and recycling large-particle crystals, allowing supernate in the collection tank to flow back to the crystal seed mixer for supplementing crystal seeds, and feeding effluent of the collection tank into a rotary spray dryer for treatment; and S6, carrying out rotary spray drying on the concentrated solution desulfurization wastewater to realize zero discharge of the wastewater. The method is used for treating the desulfurization wastewater of the power plant.

The invention provides a preparation method of a metal-based ceramic composite membrane with a catalytic ozone function. The preparation method comprises the following steps: preparing functional powder by taking tetrabutyl titanate as a titanium source and silver nitrate or ferric nitrate as a catalytic active metal source and adopting a sol-gel method; a porous metal pipe is used as a supporting body, metal powder and functional powder which are made of the same material as the supporting body are mixed to prepare functional slurry, the functional slurry is evenly deposited on the inner wall of the supporting body through vacuum filtration, and powder particles which are not firmly combined are removed through back flushing; and finally, the binding force between the functional film layer and the metal matrix is improved through high-temperature heat treatment. Wherein the thermal expansion coefficient difference between the metal supporting body and the functional film layer can be reduced by adding the metal powder, the metal powder is melted and diffused in the high-temperature heat treatment stage, and metallurgical bonding is formed between the functional powder and the metal substrate. The method is simple in process, and the prepared metal-based ceramic composite membrane has the advantages of being high in membrane layer binding force, not prone to falling off, high in catalytic activity, high in anti-pollution capacity, stable in operation and the like.

The invention provides a monatomic cobalt-doped graphite phase carbon nitride modified carbon electrode and a preparation method and application thereof, and belongs to the technical field. The prepared monatomic cobalt-doped graphite phase carbon nitride modified carbon electrode comprises a carbon electrode substrate and a cobalt-doped graphite phase carbon nitride catalytic layer. The oxygen-containing functional group of the carbon electrode and monatomic cobalt synergistically regulate and control the selectivity and activity of two-electron oxygen reduction, so that hydrogen peroxide is efficiently and stably generated by electro-catalyzing oxygen. The carbon electrode is applied to an electro-catalytic ozonation technology, H2O2 generated in situ reacts with ozone to generate hydroxyl radicals (OH), and monatomic cobalt and carbon nitride can also directly act on the ozone to generate OH, so that removal of new pollutants difficult to degrade is remarkably enhanced, and a theoretical basis and a technical support can be provided for remediation of the pollutants.

The invention discloses an ozone catalytic oxidation coupling membrane separation sewage and wastewater advanced treatment and catalyst recycling method, and belongs to the technical field of sewage and wastewater treatment. The invention aims to solve the problem that the existing ozone powder catalyst is difficult to recover and not easy to reuse. By developing a catalytic ozonation coupling membrane separation process, an integrated process structure and a split process structure and an operation mode are provided, and a backwashing method is utilized, so that recycling of a high-efficiency powder catalyst is realized, and deep treatment and purification of sewage and wastewater are coordinated. According to the method, the high efficiency of ozone oxidation is fully exerted, a large number of hydroxyl free radicals generated by fast catalytic ozonolysis efficiently oxidize and degrade organic matters, the influence of complex water quality can be dealt with, a regular membrane cleaning strategy is adopted, membrane pollution is effectively relieved, the service life of a membrane is prolonged, and the recovery rate and catalytic efficiency of a catalyst are ensured; the device has the advantages of easiness in operation, small occupied area, simple equipment structure, easiness in long-term operation and the like.

The utility model relates to the technical field of wastewater treatment, and particularly discloses a membrane catalytic ozonation reactor which comprises a reactor body (100), and a wastewater adding assembly (200) and a catalyst adding pipe (300) are respectively arranged at the upper part of the side surface of the reactor body (100); a micro-nano bubble generator (400) is arranged at the bottom in the reactor body (100), and the micro-nano bubble generator (400) is communicated with an ozone source; at least one membrane catalysis assembly (600) is connected to the reactor body (100) in a closed loop manner. The device has the characteristics of sufficient contact reaction between hydroxyl free radicals and organic matters and higher utilization rate of catalytic ozonation.

The invention discloses a system for treating leachate of a household garbage incineration plant based on direct ammoxidation, and relates to the technical field of treatment of the leachate of the household garbage incineration plant. A wastewater outlet of an anaerobic hydrolysis acidification reactor is connected to a water inlet of a first sedimentation tank, and a water outlet of the first sedimentation tank is connected to a water inlet of a direct ammoxidation reactor; a water outlet of the direct ammoxidation reactor is connected with a water inlet of the second sedimentation tank; a water outlet of the second sedimentation tank is connected with a water inlet of the heterotrophic denitrification reactor; a water outlet of the heterotrophic denitrification reactor is connected to a water inlet of the membrane bioreactor; a membrane water outlet of the membrane bioreactor is connected to a water inlet of the catalytic ozonation reactor, and effluent of the catalytic ozonation reactor flows into a water outlet barrel. The system does not need to add an expensive carbon source, so that the treatment process is simplified, the occupied area is reduced, and the construction investment and the operation cost are reduced to a certain extent.

The invention discloses a resourceful treatment system and a resourceful treatment method for high-salt organic wastewater. The treatment method comprises the following steps: sequentially carrying out membrane catalytic ozonation reaction, nanofiltration membrane filtration, catalytic wet oxidation reaction and chelate resin adsorption treatment on the high-salt organic wastewater. According to the method, macromolecular organic matters in the wastewater are reduced through membrane catalytic ozonation, then residual organic matters are concentrated and separated through a nanofiltration membrane device, and the organic matters in the wastewater are further thoroughly decomposed into carbon dioxide and water through catalytic wet oxidation. Compared with a single oxidation process, the treatment efficiency and the treatment effect of the wastewater are improved through coupling and cooperation of membrane catalytic ozone oxidation and catalytic wet oxidation. The catalytic wet oxidation device is adopted to further treat concentrated water concentrated and separated after membrane catalytic ozonation, so that the treatment load of catalytic wet oxidation equipment is reduced, and meanwhile, the volume of a catalytic wet oxidation reactor can be reduced, so that the equipment investment cost is reduced.

The invention discloses a method for purifying water by catalyzing ozonation through a nitrogen-fluorine co-doped carbon-loaded cobalt nanomaterial. Co-ZIF-8 and polytetrafluoroethylene (PTFE) are respectively used as a precursor and a fluorine source, and the nitrogen-fluorine co-doped carbon-loaded cobalt nano-catalyst is successfully prepared through an etching synchronous doping strategy. The composite material can be used for catalyzing ozone to degrade organic pollutants in water. Nitrogen doping can promote formation of a metal-nitrogen coordination structure, and decomposition of ozone on the surface of the catalyst is facilitated. Fluorine modification can significantly enhance the hydrophilicity of the composite material and accelerate the solid-liquid reaction of ozone in a solution and a catalyst interface, and the strong electron withdrawing effect of fluorine can effectively adjust the electronic structure of the catalyst and promote the generation of strong oxidizing active oxygen species, thereby achieving efficient and rapid removal of pollutants. The water treatment method solves the problem of low ozone utilization rate in a conventional catalytic ozonation process, has the advantages of high reaction rate and stable treatment effect, and has a good application prospect.

The invention discloses a method for predicting and controlling the ion dissolution concentration in a homogeneous catalytic ozonation system based on an LSTM model, and relates to the crossing field of neural networks and wastewater treatment.The method comprises the steps that historical inflow water quality parameters, operation parameters and outflow water iron ion concentration parameters of the homogeneous catalytic ozonation system are collected; preprocessing to obtain a training set and a test set; constructing an LSTM model, and performing training and testing by using the training set and the testing set to obtain a trained LSTM model; collecting inflow water quality parameters and operation parameters of a current homogeneous catalysis ozonation system, and inputting the inflow water quality parameters and the operation parameters into the trained LSTM model to obtain an iron ion concentration predicted value; and generating a current adjustment suggestion and / or a descaling operation suggestion according to the iron ion concentration predicted value. By fusing multi-source parameters, high-precision real-time prediction of the ion dissolution concentration is realized, and manual optimization of electrolysis process parameters can be effectively guided.

The invention relates to a high-entropy metal oxide catalyst and a preparation method and application thereof.The preparation method comprises the following steps that S1, ferric salt, cobalt salt, manganese salt, nickel salt, copper salt and organic alkaline matter are mixed to obtain a mixed solution, hydrothermal reaction is conducted, and a precursor is obtained; and S2, calcining the precursor at the temperature of 500-600 DEG C to obtain the high-entropy metal oxide catalyst. The high-entropy metal oxide catalyst uniformly doped with iron, cobalt, manganese, nickel and copper is prepared by adopting a hydrothermal reaction and calcination method, and the high-entropy metal oxide catalyst not only can efficiently catalyze ozone to remove antibiotics, but also can still keep an excellent antibiotic removal rate constant in a water body containing hetero ions and humic acid; and the anti-interference capability is excellent.

The invention discloses a treatment system and a treatment method for waste salt resource utilization, saturated salt water is used for cleaning waste salt, a large amount of organic matters and impurity ions in the waste salt enter washing salt water, the waste salt is separated into washing salt water and dry salt through solid-liquid separation, the separated washing salt water with high organic matter content enters a catalytic wet oxidation system, and the dry salt enters a wet oxidation system. The content of organic matters in the separated dry salt is relatively low, and the dry salt enters a membrane catalytic ozonation unit to be treated after salt dissolving. By coupling the catalytic wet oxidation technology and the membrane catalytic ozonation technology, the waste salt treatment efficiency is greatly improved, and the problem that when the catalytic wet oxidation technology is singly adopted to treat waste salt, the waste salt needs to be dissolved into a large amount of waste saline water is solved; and when a membrane catalytic oxidation technology is singly adopted to treat the waste salt, a large amount of water needs to be added to dilute the organic matters, so that the waste salt treatment efficiency is low.

The invention discloses a composite cathode material integrating electrocatalysis and ozone oxidation functions, a preparation method and application. The composite cathode material is composed of oxidized carbon nanotubes, cuprous oxide and copper oxide. The copper loading capacity of the composite cathode material is 1-10wt.%; the diameter of the oxidized carbon nanotube is 5 to 10 nm; the mass ratio of the oxidized carbon nanotubes to the cuprous oxide to the copper oxide is (298-27): (3.0-2.5): (0-1). A composite cathode material integrating electrocatalysis and ozone oxidation functions is elaborately designed and prepared and is applied to an electrocatalytic ozone coupling system, and continuous and efficient attack on antibiotic molecules and degradation intermediates thereof is realized by utilizing multiple synergistic effects among all components of the material and in the electrocatalytic ozone process, so that the electrochemical performance of the composite cathode material is improved. Therefore, the technical bottleneck of low TOC removal rate in the traditional advanced oxidation process is broken through, and a new technical approach is provided for thoroughly eliminating the antibiotic risk in the water environment.

The invention provides a preparation method of an intercalated expanded graphite catalyst for catalyzing ozone, the catalyst and application, and belongs to the technical field of graphite materials. Firstly, expanded graphite is subjected to pre-oxidation treatment, the interlayer distance of the expanded graphite is increased, then the pretreated expanded graphite is subjected to intercalation and oxidation through an intercalation substance, an ion pair compound of trityl carbocation and heteropolyanion [P (Mo3O10) 4] 3 <-> with negative electricity is introduced into the interlayer of the expanded graphite, the compound is stably intercalated between the graphite layers, and the expanded graphite is prepared. Organic pollutants and ozone molecules in the wastewater are adsorbed, and the effective collision probability and the reaction rate between the ozone molecules and the organic pollutants are improved; finally, amine substances diethylenetriamine and triethylenetetramine are used for further treating the expanded graphite, and hydrogen bonds are combined with organic compounds such as phenols, so that the adsorption performance of the graphite is improved. The prepared catalyst is combined with ozone to realize good removal of tetracycline, phenol and COD (Chemical Oxygen Demand) in wastewater.

The application provides a method for treating organic phosphorus in tanning wastewater by electrocatalytic ozone treatment with a modified foam iron electrode as a cathode, and the method comprises at least one pair of electrodes; the electrodes comprise a modified foam iron cathode and a modified graphite felt anode, the modified foam iron cathode is modified 40ppi foam iron; the method for treating organic phosphorus in tanning wastewater is as follows: the modified foam iron cathode and the modified graphite felt anode are placed in a reactor, the cathode and the anode are connected to a direct current power supply; the wastewater containing tetramethylphosphonium sulfate to be treated is added into the reactor, and the pH value of the wastewater is controlled in the range of 5-9; the mixed gas of ozone and oxygen is continuously introduced into the reactor, and the flow rate of the mixed gas of ozone and oxygen is controlled to be 0.1-0.5L / min per liter of wastewater; the direct current power supply is started to supply power to the graphite anode and the modified foam iron cathode, and the tetramethylphosphonium sulfate in the wastewater is continuously oxidized into orthophosphate salt between the electrodes; the crystallized orthophosphate salt is separated from the wastewater, and the organic phosphorus component in the tanning wastewater is removed.

The invention discloses a catalytic ozone system based on a nano zero-valent iron-resin composite material and application, and belongs to the field of organic phosphorus wastewater treatment. The system comprises an nZVI-coated D201 catalyst, ozone and organophosphorus wastewater, the pH value of the system is 4-10, the concentration of the ozone is 5-20 mg / L, the flow rate of the ozone is 0.5-1.0 L / min, and the dosage of the nZVI-coated D201 catalyst is 0.5-2.0 g / L; the nZVI-D201 catalyst is formed in an nZVI-D201 / O3 system by loading nano zero-valent iron on the surface of D201 resin, and on one hand, organic phosphorus pollutants in wastewater are rapidly enriched by means of the excellent adsorption performance of the D201 resin; on the other hand, the nano zero-valent iron loaded on the surface of the resin can efficiently catalyze ozone to generate. OH and other active species, and the enriched organic phosphorus is catalytically oxidized into inorganic phosphorus. From the perspective of phosphorus resource recovery, inorganic phosphorus generated by oxidation can be efficiently intercepted through the adsorption effect of D201 resin, and inorganic phosphorus enriched on the resin can be desorbed into a desorption solution through a subsequent desorption process, so that the inorganic phosphorus in the desorption solution becomes a recyclable phosphorus resource form.

The utility model discloses a deep treatment device for red mud leachate through catalytic ozonation. The red mud leachate treatment system comprises a solid-liquid separation unit, a homogenizing unit, a high-salt biochemical reaction unit, a catalysis unit for preparing a manganese-based catalyst, and a catalytic ozonation tower for performing catalytic ozonation on the red mud leachate, which are communicated in sequence, wherein the solid-liquid separation unit and the homogenizing unit are used for pretreating the red mud leachate; the catalytic ozonation tower is provided with a deoxidation unit, and the sludge treatment unit is respectively communicated with the solid-liquid separation unit, the homogenizing unit and the high-salt biochemical reaction unit. According to the utility model, the solid-liquid separation unit and the homogenizing unit are arranged to pretreat the red mud leachate, the obtained liquid material is subjected to catalytic ozonation through the catalytic ozonation tower to obtain an oxide material, and the oxide material is deoxidized through the deoxidation unit to obtain treated effluent; and sulfides and COD can be better removed.

The present invention discloses a tea biochar-supported manganese oxide composite material, its preparation method and application. This composite material is obtained by fully mixing manganese dioxide nanoparticles and tea powder in a mass ratio of 1:(1-7) and then calcining. The present invention utilizes the reducing substances contained in tea leaves to reduce manganese dioxide to MnO, Mn3O4 and Mn2O3 during the process of loading manganese oxides, thereby improving the catalytic performance of the composite material. The waste tea-derived biochar-supported manganese oxide composite material prepared by the present invention contains uniformly distributed calcium carbonate nanoparticles; the calcium carbonate nanoparticles can serve as alkali active sites to improve the degradation efficiency of ozone on organic matter. In addition, the manganese oxides in the composite material provided by the present invention are uniformly dispersed on the waste tea-derived biochar, and the manganese oxides are not easily agglomerated during the catalytic ozone process, effectively increasing the active sites of the catalyst and being beneficial to improving the degradation efficiency of refractory organic matter.

The invention provides a microbubble internal circulation catalytic ozonation reaction system which comprises an ozone generation unit, a catalytic ozonation unit and a tail gas recovery treatment unit which are connected in sequence, and a wastewater pipeline enters the ozonation unit through a wastewater inlet; the catalytic ozonation unit comprises a reactor main body, a central flow guide descending cylinder, a catalyst module and microbubble distributors, the central flow guide descending cylinder is arranged in the reactor main body, the liquid outlet end of the wastewater pipeline is distributed above the central flow guide descending cylinder, and the microbubble distributors are distributed on the outer side of the bottom of the central flow guide descending cylinder in a surrounding manner; the ozone generator is connected with the ozone generating unit; the catalyst module is arranged in the reactor main body and is distributed between the inner wall of the reactor main body and the central flow guide descending cylinder. An internal circulation flow field is driven by jet flow, micro-bubbles are generated in combination with an aeration technology, and gas-liquid-solid three-phase mass transfer is synergistically enhanced, so that catalytic ozonation degradation of pollutants is realized, the ozone utilization rate is increased, and the problem of traditional aeration blockage is solved.

The application discloses a preparation method and application of an ozone oxidation catalyst. 2+ The preparation method of the ozone oxidation catalyst comprises the following steps: adding a sandstone carrier, Fe, H2O2, an iron source material and wastewater into a fluidized bed reactor to obtain initial reaction liquid with pH of 4-5; swelling the sandstone carrier in the initial reaction liquid; and obtaining the sandstone carrier loaded with hydroxyl iron oxide crystals after reaction of the initial reaction liquid. The catalyst prepared by the application has a nano structure, high active component, and can realize degradation of a large category of wastewater such as coal chemical industry, coking and acrylic fiber by catalyzing ozone. The catalyst is simple and economical to prepare, has less active catalytic species dissolved in the running process, has a large pH range for degradation of the wastewater, and has the advantages of easy preparation, high efficiency, stability and low economic cost.

The application relates to the field of waste water treatment, and discloses a TFO coupling RO treatment process for high-salt low-COD coal chemical industry waste water. First, the high-salt low-COD coal chemical industry waste water is introduced into a salt-containing waste water adjusting tank to preliminarily pretreat the waste water by adjusting the water volume and the pH value; second, the water out of the adjusting tank is introduced into a flocculation and precipitation tank, a flocculant and a coagulant aid are added into the water to make the particles difficult to precipitate in the water gather each other and form flocculation bodies to precipitate with impurities; then, the supernatant after precipitation is introduced into a targeted Fenton reactor, catalytic ozone is used to generate a targeted active species to realize targeted removal of small-molecule organic matters; next, the water after the targeted oxidation is introduced into a sodium bed system and a reverse osmosis system to remove salts and macromolecular organic matters; finally, the water is further purified through a multi-medium filter to remove micro particles and bacteria which cannot be removed. The water quality of the water out of the application meets the discharge standard.

The application provides a preparation method, a catalyst and application of an intercalation expanded graphite catalyst for catalyzing ozone, and belongs to the technical field of graphite materials. First, the expanded graphite is subjected to pre-oxidation treatment to increase the interlayer distance of the expanded graphite, then the pretreated expanded graphite is subjected to intercalation and oxidation through an intercalation substance, and an ion pair compound of triphenylmethyl carbon cation and negatively charged heteropolyanion [P(Mo3O 10 )4] 3‑ is introduced between the layers of the expanded graphite, the compound is stably intercalated between the layers of the graphite, organic pollutants and ozone molecules in waste water are adsorbed, and the effective collision probability and reaction rate between ozone molecules and organic pollutants are improved; finally, the expanded graphite is further treated by using amine substances diethylenetriamine and triethylenetetramine, hydrogen bonds are combined with organic compounds such as phenols, and the adsorption performance of the graphite is improved. The catalyst prepared by the application realizes good removal of tetracycline, phenol and COD in waste water in combination with ozone.

Systems and methods for reducing obstructions in an exhaust line of a sub-atmospheric chemical vapor deposition (SACVD) system are disclosed. Such obstruction may occur due to the reaction of a silicon precursor with ozone, which forms solid particles in the exhaust line. A catalytic apparatus is provided which catalyzes the decomposition of ozone (O3) to oxygen (O2). Due to the lower reactivity of O2, the formation of solid particles is reduced.

The invention discloses a catalyst with a Cu-N vacancy defect, a preparation method of the catalyst and application of the catalyst in catalytic ozonolysis. The catalyst is of a nickel-iron hydrotalcite structure and contains Cu and N; in the catalyst, the molar ratio of Ni to Fe is (2.9-3.1): 1, the content of Cu accounts for 3-18% of the total amount of substance of Ni and Fe, and a Cu-N vacancy defect is formed between Cu and N. The formation of the Cu-N vacancy defect increases the oxygen vacancy content, so that the catalyst has excellent ozonolysis performance, and the obtained catalyst has excellent moisture resistance and shows excellent ozonolysis efficiency under dry and wet air conditions.

The present application belongs to the field of wastewater treatment, and provides a treatment method for refractory wastewater. Specifically, the method comprises three process steps of pretreatment, biochemical treatment and advanced treatment, and sequentially carries out pretreatment, biochemical treatment and advanced treatment on the refractory wastewater. In the pretreatment stage, the fluidized bed crystallization technology and Fenton-like reaction are used to obtain crystalline bodies with high catalytic activity and improve the B / C of the wastewater; the effluent from the pretreatment is subjected to neutralization, degassing, flocculation and precipitation and other treatment processes, and the degradable acetic acid remaining in the pretreatment stage is used as a carbon source to re-enter the biochemical treatment stage, which is treated by the AO process method, and has low carbon and economy; finally, the wastewater after the biochemical treatment enters the advanced treatment stage, and the high catalytic activity of the waste catalytic crystalline bodies in the pretreatment stage is used to carry out catalytic ozone micro-bubble treatment on the wastewater to reach the national discharge and reuse standards, and the waste catalysts can also be resourcefully utilized. The wastewater treatment process provided by the present application has high treatment efficiency and low cost, runs through the whole wastewater treatment process, and has a wide application prospect.

The invention discloses a CaO-C-Co catalyst material and a preparation method thereof. The preparation method comprises the following steps: (1) synthesizing a Ca-MOF precursor by adopting a solvothermal reaction; and (2) impregnating the Ca-MOF precursor with a soluble cobalt salt solution, drying, and calcining in an inert atmosphere at 750-850 DEG C for 2-3 hours to obtain the CaO-C-Co catalyst material. The CaO-C-Co catalyst material disclosed by the invention shows excellent cycle stability while efficiently catalyzing ozone to degrade organic pollutants, has important significance in promoting the practical application of the technology, and can be applied to catalyzing ozone to oxidize and degrade the organic pollutants in water.

The application discloses a treatment system and method for turbulent catalytic ozone oxidation of wastewater. The treatment system utilizes the strong power provided by water-gas mixing to make the fluid in the intense turbulent motion of swirling and tumbling, improves the gas-liquid-solid contact and mixing behavior, realizes the fluidization of the large-density powder catalyst, promotes the interphase mass transfer, and greatly improves the treatment efficiency of pollutants. The application can fully utilize the catalytic advantages of the ozone catalyst and the strong power provided by water-gas mixing, effectively solve the fluid dynamics inertia of the micron zero-valent iron powder as the ozone catalyst caused by the large density, and enhance the mass transfer between the solid-liquid-gas phases.