133results about How to "Improve catalytic oxidation efficiency" patented technology

The invention relates to the field of industrial wastewater treatment processes and provides a method for deeply treating, desalting and recycling industrial wastewater with high salt content. The method comprises the following steps: 1) carrying out efficient coagulation treatment on the industrial wastewater with high salt content to obtain supernatant; 2) carrying out chemical precipitation on the supernatant obtained in the step 1) to remove high valence ions with valence higher than bivalence in the wastewater; 3) carrying out catalytic ozonation treatment on the supernatant subjected to chemical precipitation in the step 2); 4) carrying out multi-media filtration, precise filtration and membrane filtration treatment on the wastewater subjected to catalytic ozonation in the step 3) in sequence; and 5) carrying out electrodialysis reversal treatment on the effluent obtained after membrane filtration in the step 4). By adopting the method, organic matters, bacteria, colloids, suspended particles, Ca<2+>, Mg<2+> and high valence ions, other soluble inorganic salts and the like in the industrial wastewater with high salt content are removed by utilizing the coupling and synergistic effects of different unit technologies, thus achieving deep treatment, desalting and recycling of the industrial wastewater with high salt content.

The present invention provides the biosynthesis of Schwertmannite as high efficiency adsorbent and its usage in adsorbing to eliminate Cr(VI) and As from waste water and underground water. Schwertmannite is prepared with ferrous sulfate as reactant, deionized water as reaction medium and Thiobacillus ferrooxidans LX5 as catalytic oxidant, and through stirring for 1-3 days, filtering to collect precipitate, washing with sulfuric acid acidified deionized water, washing with deionized water and stoving. Schwertmannite is added into water to be treated in the amount of 0.5 wt% or 0.02 wt%, dilute nitric acid is added into Cr(VI) containing system to regulate the pH value to 5.0-7.0 or sodium hydroxide is added into As containing system to regulate the pH value to 6.0-10.0, and the system is stirred for 3 hr and filtered to eliminate Cr(VI) and As. Schwertmannite has maximum adsorption amount on Cr(VI) and As of 55 mg/g and 65 mg/g separately.

The invention relates to a treatment method for reverse osmosis concentrated water, in particular to a standard treatment method for the reverse osmosis concentrated water which is produced during sewage reusing. The treatment method comprises the following steps: the pH value of the reverse osmosis concentrated water is regulated to be 2.0-4.0, and electrolytic catalysis oxidation is carried out; water produced from the electrolytic catalysis oxidation is subjected to redox reaction in an electrolytic reactor, which is filled with iron-carbon fillers obtained through sintering of iron and carbon; hydrogen peroxide is then added, so that oxygenolysis is further achieved; the pH value is regulated to be 6.0-8.0, and a flocculant is added for flocculent settling; a supernate obtained from the flocculent settling enters an aeration biological tank, and a co-substrate is added for biological degradation. The COD of the reverse osmosis concentrated water with lower biodegradability, which is obtained through reverse osmosis reusing treatment after standard biochemical treatment, is reduced from 70-200 milligrams per liter to below 50 milligrams per liter, so that the strictest local emission standards can be met.

The invention discloses an efficient treatment system and a treatment method for organic wastewater of bulk drug production in the pharmaceutical industry. The system comprises a high-concentration wastewater pretreatment unit, a triple effect evaporation unit, a biochemical treatment unit, a sludge pressure filtration unit and an activated carbon filtration deep treatment unit. By introduction ofa series of treatment means such as iron carbon reduction, catalytic oxidation, coagulation air floatation, triple effect evaporation, biochemical reaction and the like into the unit system, physicochemical treatment and biochemical treatment are combined together, removal efficiency of pollutants is increased, and the pollutants such as COD (chemical oxygen demand), ammonia nitrogen, SS (suspended solids) and the like in the wastewater are effectively degraded.

The invention discloses a technology and device for treating coking wastewater through an ozone catalytic oxidation combined biofilter. The technology and device are reasonable in design, low in operation cost, solve the problem related to advanced treatment and recycling of coking wastewater, and have a high engineering application value; the technology and device eliminate the unsafe factors for operators and potential risks threatening the health in a heavily polluted environment with coking wastewater, and are simple to operate and low in operation cost; the effluent water quality meets different water use requirements.

The invention discloses a molecular sieve supported Cu-Cp Schiff base complex, and a preparation method and application thereof. A method of 'building a ship in a bottle' is employed for packaging a complex in molecular sieve, thus the complex is prevented from forming dimer, multimer or peroxides, and the catalytic oxidation activity of the complex is kept. The complex has high catalytic oxidation efficiency on sulfides in gasoline and is easy to recover and reuse, and gasoline subjected to sulfide degradation is high in recovery rate and high in reutilization rate. The preparation method is simple in operation and has industrial practicality.

The invention relates to metal doped modified layered [delta]-MnO2, preparation and applications thereof. According to the present invention, the metal doped modified layered [delta]-MnO2 is preparedby adding a settling agent through a hydrothermal method, wherein the specific surface area is increased by 5 times compared with the undoped layered [delta]-MnO2, and the pore channels are dense, such that the metal doped layered [delta]-MnO2 has high catalytic oxidation activity and high chlorine resistance, and has efficient catalytic degradation performance on refractory volatile organic compounds in organic waste gas; and the preparation method is simple, and has industrial application value.

The invention relates to a magnetic light-enzyme composite catalyst and a preparation method thereof. The magnetic light-enzyme composite catalyst is laccase immobilized on magnetic nano TiO2 processed by surface functionalization, particularly laccase immobilized on magnetic nano TiO2 particles modified by copper ion chelating. According to the invention, the magnetic light-enzyme composite catalyst provided by the invention realizes the transmission of electrons between laccase and TiO2 in the catalytic oxidation process, solves the problems of slow speed of receiving electrons by laccase from the substrate and slow combination between photoinduced electrons and O2; by using the synergism of enzyme catalysis and photocatalysis to raise catalytic oxidation efficiency, the oxidation of substrates with high oxidation-reduction potential and macromolecule substrates can be realized; the catalyst has superparamagnetism, can be conveniently and effectively controlled and separated under the effect of external magnetic field, the preparation process is simple, and the catalyst is suitable for large scale production.

The invention provides a catalyst and a preparation method thereof, wherein the catalyst comprises the following compositions in percentage by mass: 20 to 60% of Fe2O3, 20 to 60% of MnO2, 9.7 to 30% of Mn2O3, and 6 to 30% of Mn3O4; and the method for preparing the catalyst comprises the following steps of: adding a polyethylene glycol aqueous solution into a bivalent manganese salt aqueous solution at a certain temperature, then adding potassium permanganates and a ferric salt aqueous solution into the obtained mixed solution; stirring the obtained mixture so as to obtain a precipitate; filtering the obtained object so as to obtain a solid as the precursor of the catalyst; drying and then roasting the solid; and crushing the obtained solid subjected to roasting into particles so as to obtain the catalyst. The catalyst and the preparation method provided by the invention have the advantages that by using the prepared catalyst, at a reaction temperature of 100 DEG C, the rate of conversion between NO in tail gas and NO2 can achieve 91%; the prepared catalyst is larger in specific surface area and pore volume, and high in catalytic oxidation efficiency; and the prepared catalyst has a low-temperature catalytic activity, and can be used in the removal of NO in low-temperature oxygen-containing exhaust emission sources without performing the removal at a high temperature and addingoxidants, thereby saving energy and reducing consumption and cost.

The invention provides a catalyst for catalytically oxidizing low-concentration methane. The catalyst is composed of octahedral CeO2 particles and Pd nano particles supported on the surfaces of the octahedral CeO2 particles. The catalyst for catalytically oxidizing the low-concentration methane provided by the invention is a Pd-based octahedral CeO2 catalyst, the Pd nano particles have a high dispersion degree and good relative stability on the surfaces of the carrier octahedral CeO2 particles, the catalyst has high catalytic oxidation efficiency of the low-concentration methane and good relative thermal stability, temperature required for complete conversion of the low-concentration methane is low, catalytic reaction products are H2O and CO2 which are environmentally-friendly products, and the catalyst has great application value in the field of catalytic oxidation of the low-concentration methane.

The invention discloses an SCR catalyst for efficiently oxidizing elemental mercury and a preparation method of the SCR catalyst. The catalyst is composed of three parts including an active component, an adjuvant and a carrier, wherein the active component is a mixture of CuCl2 and V2O5; the adjuvant is WO3; the carrier is TiO2; the mass of the catalyst is measured on the basis of the mass of the carrier; the masses of the active component and the adjuvant respectively account for 1-10% and 1-8% of the mass of the carrier; and the mass ratio of CuCl2 to V2O5 in the active component is (1-10):10. The SCR catalyst has the beneficial effects that the dependency on the content of Cl in smoke is relatively low, so that the relatively high denitration efficiency is ensured, and meanwhile the elemental mercury can be efficiently oxidized; the two active components CuCl2 and V2O5 are effectively proportioned, so that the catalytic oxidation efficiency of the catalyst to the elemental mercury is greatly increased; and the preparation method of the SCR catalyst disclosed by the invention is an impregnation method which is simple in step, easily-controlled in reaction process and good in stability.

The invention belongs to the technical field of wastewater treatment in chemical engineering and environmental engineering, and relates to a catalytic oxidation catalyst, a preparation method thereof,and an advanced treatment method of organic matters in MDI brine. The catalyst comprises a carrier and an active component, the carrier is titanium dioxide, and the active component is an organic neutral ligand-metal complex ionic liquid. The advanced treatment method comprises the following steps: (1) adjusting the pH value of the MDI brine, and adding an oxidant to carry out treatment; and (2)contacting the treated MDI obtained in step (1) with a catalytic oxidation catalyst to carry out a catalytic oxidation reaction so as to obtain advanced treated brine. The catalyst can reduce or evenavoid the loss of metal in the catalyst while ensuring the improvement of the catalytic oxidation effect; and the advanced treatment method has the advantages of simplicity, easiness in implementation, high treatment efficiency, and no secondary pollution.

The invention belongs to a method and a device for oxidatively decomposing pollutants in exhaust gases emitted by an internal combustion engine with the intervention of ultraviolet light. At least one ultraviolet light irradiated region through which the exhaust gases emitted by the internal combustion engine pass is arranged in an exhaust system of the internal combustion engine, at least one photocatalyst net through which the exhaust gases emitted by the internal combustion engine pass is arranged at at least one end of the ultraviolet light irradiated region, and the ultraviolet light intervenes in the oxidative decomposition of the pollutants in the exhaust gases emitted by the internal combustion engine. Particulate matters emitted by the internal combustion engine can be decomposed and purified, and the catalytic oxidation-reduction reaction of a three-way catalytic converter is added, so that the problems of emissions of the particulate matters of the internal combustion engine are solved, noxious substances in the tail gases are purified, and environmental pollution is reduced; and the method is simple and practical, the emissions of harmful gases in the tail gases can be effectively reduced, and the environmental pollution can be reduced.

The invention provides an integral composite catalytic oxidation-membrane separation wastewater treatment method which comprises the following steps: S1, introducing wastewater with a suspension catalyst, a mixed gas of ozone and oxygen and hydrogen peroxide into a gas-liquid mixer; S2, introducing the wastewater into a composite catalytic oxidation reactor, and inputting into an energy field through an energy field generation device; S3, filtering the wastewater by using a ceramic membrane filter, performing up-to-standard emission on effluent, emptying the treated gas, and feeding back membrane concentrated water which does not pass through the ceramic membrane filter and contains the suspension catalyst to the step S1. Devices used in the method provided by the invention comprise one gas-liquid mixer which can generate micro-nano bubbles, so that the apparent solubility of ozone and oxygen in the wastewater can be effectively improved, and the catalytic oxidation efficiency can be improved. Due to adoption of the energy field generation device, microwaves, ultrasonic waves, the catalyst and an oxidant have synergic effects in a composite catalytic oxidation reactor, so that the degradation velocity of pollutants by the oxidant can be increased.

The invention discloses an electrodegradation recovery method of a carbon fiber reinforced composite material. According to the invention, electrocatalytic oxidation is adopted to oxidize thermosetting resin into a low-molecular-weight thermoplastic polymer and quickly dissolve the low-molecular-weight thermoplastic polymer in a mixed solvent, thereby separating and recovering carbon fibers and implementing resource reutilization. The conductivity of the mixed solvent and the solubility of the high-molecular polymer are good, so the catalytic oxidation efficiency of the fiber reinforced material can be obviously improved, a fiber recovery rate can reach 95% or above, and the thermosetting cross-linked epoxy resin is electrocatalytically oxidized and degraded into the low-molecular-weight thermoplastic polymer which is then dissolved in the mixed solvent, so separation and recycling are realized; and after electrocatalytic oxidation, water and the organic solvent can be directly distilled and recovered from electrodegradation liquid, and the electrodegradation liquid recovered through reduced-pressure distillation and washing liquid are mixed to serve as the electrodegradation liquid to be reused. The electrodegradation recovery method has the advantages of mild degradation conditions, simple process operation, no corrosion, a small amount of three wastes, environmental optimization and the like.

The invention discloses a method for desulfurizing sodium sulfide wastewater, belonging to the fields of electronic electroplating wastewater treatment and comprehensive reutilization. The method comprises the following steps: (A) regulating the pH value of sodium-sulfide-containing waste liquor to 6.0-9.0; (B) introducing the sodium-sulfide-containing waste liquor subjected to pH value regulation in the step (A) into an aeration reaction tank, starting an aerator while adding 0.1-10 wt% of catalyst, and reacting for 0.5-2 hours; (C) naturally flowing the mixed solution obtained in the step (B) into a precipitation tank, and standing to precipitate for 1-2 hours; and (D) sending the supernate in the step (C) into the next sewage treatment unit as effluent water, taking out the residual precipitate in the precipitation tank, packing, and transporting. The catalyst is a metal and oxide thereof or a mixture of multiple metals and oxides thereof. The method has the advantages of high oxidization efficiency, thorough desulfurization, simple technique and the like, and can effectively remove sodium sulfide in wastewater.