13results about How to "Efficient denitrification" patented technology

This invention relates to a bacterial consortium capable of highly efficient denitrification at low temperatures and its applications. The bacterial consortium LH28 provided by this invention possesses highly efficient denitrification capabilities, able to remove nitrogen pollution under low-temperature conditions. After screening and optimization, under conditions of sodium acetate as the carbon source, a C / N ratio of 20, pH 7, a temperature of 15°C, a rotation speed of 180 rpm, and an inoculum size of 10%, the consortium can remove 98.9% of 200 mg / L ammonia nitrogen and 63.2% of nitrate concentration within 36 hours. This invention also provides a cultivation method and degradation treatment steps for this bacterial consortium, ensuring its stability and efficiency in practical operation. Experimental data show that compared to traditional methods with poor low-temperature adaptability, long treatment times, and high costs, this bacterial consortium significantly improves the treatment effect when treating nitrogen-containing wastewater, demonstrating significant advantages and broad application prospects.

The invention belongs to the technical field of chemical engineering separation, and provides a natural eutectic solvent and a preparation method and application thereof, the natural eutectic solvent comprises the following components: caprolactam, citric acid and water; wherein the molar ratio of caprolactam to citric acid is (1-4): (1-2); the mass of the water is 20-40% of the sum of the mass of the caprolactam and the mass of the citric acid. By introducing water as a third component, the viscosity of the system is effectively reduced, the mass transfer performance is improved, and the denitrification efficiency is improved. The eutecticevaporate solvent provided by the invention can provide more reaction sites, has relatively strong removal capacity and selectivity on nitrogenous organic matters, and can realize efficient denitrification under mild conditions. The natural deep-eutectic solvent prepared by the preparation method disclosed by the invention is applied to removal of basic nitrides of oil products, and has the advantages of short time consumption and low dosage, namely high removal efficiency.

This application relates to the field of wastewater treatment and discloses a wastewater treatment method and equipment based on short-cut nitrification coupled with anaerobic ammonium oxidation. The method includes adding raw sludge to a reactor; adding wastewater to be treated to the reactor for screening treatment according to a first preset influent time to form pretreated wastewater, wherein the pretreated wastewater includes semi-finished wastewater and semi-finished sludge, the semi-finished sludge containing short-cut nitrifying bacteria; adding wastewater to be treated to the reactor for incremental treatment according to a second preset influent time to form secondary treated wastewater, wherein the secondary treated wastewater includes secondary treated wastewater and short-cut nitrifying bacteria inoculum; adding the wastewater to be treated and anaerobic ammonium oxidation bacteria inoculum to the reactor for coupled treatment to form dischargeable wastewater, wherein the dischargeable wastewater includes dischargeable clarified liquid and finished sludge. The wastewater treatment method based on short-cut nitrification coupled with anaerobic ammonium oxidation of this application can achieve deep denitrification of high-nitrogen, low-carbon wastewater.

The invention discloses a fiber ceramic-based catalytic filter element for denitration of industrial flue gas and a preparation method of the fiber ceramic-based catalytic filter element, and belongs to the technical field of catalytic filter elements. According to the preparation method, firstly, a chelating agent is introduced in the preparation process of TiO2 sol to improve the dispersity and particle size uniformity of TiO2 nanoparticles, the chelating agent can effectively adjust the hydrolysis rate of butyl titanate by means of the strong coordination acting force of the chelating agent and titanium ions, and high-dispersity and small-particle-size TiO2 sol is constructed; then, the fiber ceramic base material is immersed in the TiO2 sol, a firm TiO2 coating is formed after calcination, the firm TiO2 coating serves as a carrier with a high specific surface area, and the binding force between the firm TiO2 coating and the base material is enhanced; the preparation method comprises the following steps: firstly, preparing a TiO2 coating, then dipping a solution containing vanadium and tungsten precursors onto the composite carrier, and calcining to form a main active component V2O5 and a cocatalyst WO3 which are highly dispersed on the surface of the TiO2 coating to form selective catalytic reduction active sites, thereby finally obtaining the fiber ceramic-based catalytic filter element which is good in blocking resistance, water-resistant, sulfur-resistant and high-temperature-resistant and can be used for industrial flue gas denitration.

The application discloses a bismuth-nickel-iron composite oxide catalyst, a preparation method and application. A bismuth source, a nickel source and an iron source are dissolved in a mixed solvent of ethanol and ethylene glycol, and then are fully stirred to obtain a mixed solution; oil amine and urea are added into the mixed solution, and after ultrasonic mixing, the mixture is moved to a polytetrafluoroethylene reaction kettle for a solvothermal reaction; after the reaction solution is cooled, the product is washed, dried and calcined, and finally the bismuth-nickel-iron composite oxide catalyst is obtained. The application prepares a spinel nanometer catalyst with stable performance, the NO removal rate of which reaches 90% at 175 DEG C, the denitration efficiency of which is as high as 100% at 225 DEG C, the medium-low temperature denitration performance of which is excellent, and the catalyst has the characteristics of high CO-SCR denitration efficiency and magnetic recyclability. In addition, proper bismuth doping is beneficial to improving the sulfur resistance of the nickel-iron catalyst, and thus the catalyst has a wide application prospect.

The invention discloses an application of pseudomonas paraxanthohuensis in biological nitrogen removal and sewage treatment. The invention belongs to the technical field of biology, and particularly relates to application of pseudomonas paraxanthoceras in biological denitrification and sewage treatment. The pseudomonas paraxanthomonas disclosed by the invention can be applied to the following aspects: (a1) biological nitrogen removal; (a2) preparing a biological denitrification product; (a3) sewage treatment; and (a4) preparing a product for sewage treatment. As a heterotrophic bacterium, the strain 1.15632 disclosed by the invention has the capability of converting ammonia into nitrogen under an aerobic condition, and also has good ammonia nitrogen and total nitrogen removal capability. The pseudomonas paraxanthoceras shows great application potential in the aspects of improving the sewage treatment effect, reducing the cost and energy consumption and the like.

The utility model discloses a composite catalyst filter tube for denitration and catalytic removal of VOCs (Volatile Organic Compounds) in a wide temperature range, which comprises a ferromanganese catalyst layer, a vanadium-titanium catalyst layer and a noble metal catalytic oxidation layer which are sequentially arranged along a waste gas transmission direction, and the ferromanganese catalyst layer can perform denitration treatment on waste gas within a temperature range of 100-300 DEG C; the vanadium-titanium catalyst layer can play a denitration role in an environment of 250-500 DEG C; the precious metal catalytic oxidation layer can assist the denitration reaction of the medium-high temperature section and can also catalyze and remove VOCs in the waste gas. The filter tube can be used for efficiently denitrating waste gas within the range of 100-500 DEG C, and can also be used for catalytically removing VOCs (Volatile Organic Compounds) at the same time.

The utility model relates to a kind of ammonia water spraying devices of denitration system, including pressure pump, ammonia water collection unit, flue gas conveying pipe, ammonia water primary atomization unit, ammonia water secondary atomization unit, pressure pump is installed in the air inlet shell outside of denitration system, and air inlet shell is inverted L shape, ammonia water primary atomization unit is set in the upper portion in air inlet shell and is connected with pressure pump, ammonia water collection unit is set in ammonia water primary atomization unit below, for collecting the redundant ammonia water that ammonia water primary atomization unit sprays, ammonia water secondary atomization unit is set on ammonia water collection unit, for the redundant ammonia water collected is atomized again.The utility model can collect the redundant ammonia water that sprays, and under the action of ammonia water secondary atomization unit, the ammonia water collected is atomized, not only can avoid ammonia water waste, ammonia water spraying can be increased, effectively improve ammonia water and flue gas mixing, more efficiently carry out denitration.

The invention discloses an echelon utilization method of nitrate-containing wastewater, which comprises the following steps: S1, catalyst preparation: preparing a carbon fiber loaded metal particle catalyst by using metal nitrate in the nitrate-containing wastewater through soaking loading and Joule heat treatment; and S2, electrochemical reduction: assembling the catalyst into a membrane electrode assembly, and reducing nitrate ions in the nitrate-containing wastewater used in the step S1 or from another source into ammonia under an electrochemical condition. The method realizes synergetic recycling of metal ions and nitrate ions in the wastewater, forms a closed-loop process of treating waste with waste and turning waste into wealth, has the advantages of no secondary pollution, low cost, stable catalytic performance and capability of producing high-added-value ammonia products, and is suitable for nitrate-containing wastewater treatment in industries such as agriculture, photovoltaics, semiconductors and the like.

The utility model relates to the technical field of denitration, and provides a denitration reaction device which comprises a denitration tank, a denitration motor is arranged at the top of the denitration tank, a main breather pipe is arranged at the output end of the denitration motor, and the output end of the denitration motor penetrates through the top of the denitration tank and is connected to the main breather pipe. A plurality of groups of branch breather pipes are uniformly and symmetrically arranged on the side wall of the main breather pipe, fan blades are arranged below the branch breather pipes, spray pipes are uniformly arranged above the branch breather pipes, and the main breather pipe, the branch breather pipes and the spray pipes are all communicated; the rotation of the fan blades and the spraying of ammonia gas of the spraying pipe form a synergistic effect, so that the flue gas and the ammonia gas are fully mixed, the catalytic reaction is accelerated, the efficiency of the whole denitration process is improved, the purpose of efficient denitration is finally achieved, the denitration effect is optimized in the process, the denitration rate is also improved, and the service life of the denitration device is prolonged. Powerful guarantee is provided for industrial waste gas treatment.

This invention relates to the field of wastewater treatment technology, and more particularly to a method for enhancing anaerobic ammonia oxidation (AAO) denitrification using iron-loaded polyurethane porous materials. The method includes the following steps: Anaerobic ammonia oxidation sludge, iron-loaded polyurethane porous materials, and wastewater containing ammonia nitrogen and nitrite nitrogen are thoroughly mixed in an anaerobic reactor and reacted under anaerobic conditions at a temperature of 31-35°C. The iron-loaded polyurethane porous materials are prepared as follows: polyurethane sponge is selected as a carrier, cut and cleaned, and then immersed and stirred in a mixed iron salt solution for a period of time. The pH of the mixed solution is adjusted to alkaline, resulting in the formation of a red precipitate. The iron-loaded polyurethane porous materials are then hydrothermally synthesized. The mixed iron salt solution includes ferric chloride and ferric nitrate. The carrier material prepared by this invention, when applied to an anaerobic ammonia oxidation system, can effectively shorten the process start-up time, promote the enrichment and biofilm formation of anaerobic ammonia oxidizing bacteria, and achieve a high total nitrogen removal rate.

The invention relates to a hot air supply system and method for preparing white carbon black through rice hull gasification. The hot air supply system comprises a rice hull gasification device, a first-stage gas-gas heat exchanger, a filter bag dust collector, a second-stage gas-gas heat exchanger, a waste heat boiler, an air mixing device and an SCR denitration device. The rice hull gasification device is used for outputting dust-containing fuel gas after rice hull gasification, and the dust-containing fuel gas is subjected to primary cooling through a primary gas-gas heat exchanger and subjected to dust removal through a filter bag dust remover to obtain clean fuel gas; the clean fuel gas is secondarily cooled by the secondary gas-gas heat exchanger and is combusted in the waste heat boiler to form high-temperature flue gas, and the high-temperature flue gas is cooled by the air mixing device and is changed into clean flue gas after passing through the SCR denitration device; clean flue gas sequentially passes through the second-stage gas-gas heat exchanger and the first-stage gas-gas heat exchanger to be subjected to heat exchange and temperature rise to form target clean flue gas, the target clean flue gas is used for preparing white carbon black, after waste heat is utilized, the target clean flue gas is directly discharged, and a chimney and an induced draft fan do not need to be used. The technical problems that in the prior art, a device is complex in process, high in energy consumption and poor in operation stability are solved.

This invention relates to a catalyst, its preparation method, and a treatment apparatus and method for cyanide-containing wastewater. The catalyst preparation steps include: mixing a source M, carbon materials, and a hard template agent, followed by drying to obtain a precursor; the precursor is then subjected to microwave pretreatment, pyrolysis, and acid washing to obtain the catalyst; the source M includes organometallic framework compounds containing M and / or organometallic complexes containing M; M includes any one or a combination of at least two of cobalt, iron, copper, or manganese; the hard template agent includes magnesium chloride, calcium carbonate, or silicon dioxide. The catalyst provided by this invention can achieve single-atom dispersion of M. When used in the treatment of cyanide-containing wastewater, it can synergistically work with anaerobic ammonia oxidation to achieve efficient denitrification, and the treatment method can form a closed loop of pollutant self-disposal through "waste-to-waste" treatment.