124 results about "Oxidized nitrogen" patented technology

The invention relates to the technical field of automobile air purification, and particularly discloses a filtering material, a preparation method of the filtering material and a novel automobile air conditioner multi-effect catalytic formaldehyde removal filter. The filtering material comprises a PET (Polyethylene Terephthalate) supporting layer, a gas filtering layer and a PP (Polypropylene) electrostatic filtering layer which are arranged in sequence, the gas filtering layer is prepared from the following raw materials in parts by weight: 30 to 90 parts of activated carbon and 10 to 70 parts of manganese catalyst. The gas filtering layer composed of the activated carbon and the manganese catalyst is matched with the filtering material composed of the PET supporting layer and the PP electrostatic filtering layer, four gases of n-butane, methylbenzene, sulfur dioxide and nitrogen dioxide can be adsorbed, the manganese catalyst degrades formaldehyde at normal temperature, meanwhile, the reaction on the formaldehyde is a catalytic reaction, and the environment-friendly effect is achieved. Therefore, the filter material disclosed by the invention also has longer service life, so that a filter made of the filter material has a better formaldehyde removal effect and longer service life.

The utility model discloses a diesel generator flue gas purification mechanism for civil air defence engineering, including air inlet pipe and purification bin, the air inlet pipe one end is linked with diesel generator exhaust pipe in civil air defence engineering power generation room intercommunication, the other end of air inlet pipe is inserted into the purification bin and the opening direction is perpendicular to downward, the open end position of air inlet pipe in the purification bin is connected with the shunt joint, each interface of shunt joint all is connected with the jet pipe that the air hole of pipe body lateral wall is evenly set up, the utility model relates to civil air defence engineering technical field, utilize liquid supply booster pump and press into the spray subassembly in alkaline solution (15% magnesium hydroxide compound agent), and further via spray subassembly to the spray of filler layer, make the nitrogen monoxide, nitrogen dioxide, sulfur dioxide and particulate matter etc. in tail gas contact with the alkaline water mist in purification bin and filler layer, to the purification treatment of nitrogen monoxide, nitrogen dioxide, sulfur dioxide and particulate matter.

The utility model discloses a reaction device for normal-pressure leaching of nitric acid, which is characterized in that in the reaction process, nitric oxide in a reaction kettle enters an absorption tower through a nitric oxide exhaust outlet, a first pipeline and a nitric oxide gas inlet, and an oxygen supply device supplies oxygen to the absorption tower; an absorption liquid circulating pump I conveys an absorbent in the absorption tower circulating device to an absorbent circulating inlet I and enters the absorption tower, the absorbent absorbs nitric oxide gas to form nitric acid, nitric oxide released in the process reacts with oxygen to generate nitrogen dioxide, and the nitrogen dioxide reacts with the absorbent to generate nitric acid; according to the device, nitrogen oxide gas generated in the reaction process can be absorbed, the obtained absorption acid (nitric acid) can be cyclically applied to the leaching reaction, and tail gas can be discharged after reaching the standard. And the method is environment-friendly.

The invention relates to a method for producing an electrochemical cell, preferably a fuel cell, in particular a PEM fuel cell, in which a catalyst material is deposited on a carbon-based support material having a porous structure in order to form an electrode of a membrane-electrode assembly and the carbon-based support material is subsequently subjected to a thermal post-treatment, the carbon-based support material is selectively oxidized by means of a reaction gas containing at least one reactant, preferably carbon dioxide (CO2), ammonia (NH3), nitrogen dioxide (NO2), nitrogen monoxide (NO) and / or water vapor (H2O). The invention also relates to an electrochemical cell, preferably a fuel cell, in particular a PEM fuel cell.

The present invention relates to a process for removing nitrogen oxides, nitrous oxide and carbon monoxide from a gas stream (1), comprising: (a) oxidizing nitric oxide in the gas stream to form nitrogen dioxide by adding an oxygen-containing gas (3) to the gas stream (1), thereby obtaining a nitric oxide-depleted gas stream, and washing the nitric oxide-depleted gas stream with water (7) to obtain a nitric oxide-depleted gas stream (11) to remove nitrogen oxides from the gas stream (1); (b) oxidizing at least a portion of the carbon monoxide in the nitrogen oxide-depleted gas stream (11) to form carbon dioxide, thereby obtaining a carbon monoxide-depleted gas stream (19); (c) converting nitrous oxide in the carbon monoxide-depleted gas stream (19) to nitrogen and oxygen if the carbon monoxide-depleted gas stream (19) does not contain carbon monoxide, or converting nitrous oxide in the carbon monoxide-depleted gas stream to nitrogen and oxygen and / or carbon dioxide if the carbon monoxide-depleted gas stream (19) still contains carbon monoxide, or converting nitrous oxide in the carbon monoxide-depleted gas stream (19) to nitrogen and oxygen and / or carbon dioxide if the carbon monoxide-depleted gas stream (19) still contains carbon monoxide; to obtain a purified tail gas stream (25).

The invention belongs to the technical field of nano sensing and gas monitoring, and discloses an MXene / ZnO nano composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: firstly, etching Ti3AlC2 by using hydrochloric acid and lithium fluoride to obtain multi-layer two-dimensional MXene, and then carrying out ultrasonic stripping and freeze drying to obtain few-layer MXene; carrying out alkalization treatment on few layers of MXene, and then carrying out centrifugal cleaning to obtain 1D / 2D-MXene with a composite structure; the preparation method comprises the following steps: adding 1D / 2D-MXene and zinc acetate dihydrate into a mixed solution of water and ethanol, and carrying out a hydrothermal reaction; the preparation method comprises the following steps of: performing centrifugal cleaning and vacuum drying to obtain a multi-level 1D / 2D-MXene / 0D-ZnO nano-composite structure consisting of 0D-ZnO, 1D-MXene and 2D-MXene, and the multi-dimensional nano-composite structure is suitable for preparing a gas sensor and is used for detecting low-concentration nitrogen dioxide gas at room temperature. The nano composite material and the sensor prepared by the invention show excellent gas-sensitive performance on nitrogen dioxide gas, are high in sensitivity, can realize normal-temperature detection, and have relatively great application potential.

The invention discloses a porous crystal material for air purification and a preparation method and application thereof. The crystal material belongs to a tetragonal system, the space group is P43212, the simple formula of the chemical structure is [Ni (Htbc) (fdpy) (H2O)], the molecular formula is C54H42NiN2O7, and the cell parameter is # imgabs0 # alpha = beta = gamma = 90 degrees; the prepared crystal material has a clear space structure and an accurate molecular formula, has good adsorption performance on harmful gas micromolecules, is used as a porous crystal material for removing harmful gas pollutants such as formaldehyde, acetylene, ethylene, halogenated hydrocarbon, nitric oxide, nitrogen dioxide, ammonia or sulfide and the like for air purification, and has a wide application prospect. The technology has the advantages of simplicity in operation, low cost, stable performance, suitability for large-scale production and the like.

The invention provides a heat pipe enhanced heat exchange reducing absorption tower for nitric acid preparation, which comprises a tower body and a heat pipe exchanger, nitric oxide gas enters from the tower bottom, absorption liquid enters from the tower top, and the nitric oxide gas and the absorption liquid contact and react in the tower body to generate nitric acid, and is characterized in that the tower body is divided into a plurality of sections from top to bottom, the diameters of the sections are different, and the diameters of the sections are different in the direction from top to bottom; the diameter of the tower body is gradually increased; a plurality of heat pipe heat exchangers are arranged, an inclined angle is formed between the heat pipe heat exchangers and the tower body, an evaporation section of each heat pipe is arranged in the tower body, and a condensation end of each heat pipe extends out of the tower body. The design of the reducing absorption tower is matched with the concentration of nitrogen oxide, so that the absorption efficiency can be remarkably improved.

The invention discloses a method for relieving and eliminating sewage anaerobic fermentation stink. The method comprises the following steps: mixing malodorous gas generated by anaerobic fermentation with nitrogen dioxide, and carrying out gas-phase oxidation reaction; the reacted gas is subjected to ultraviolet photolysis treatment, so that nitrogen dioxide is decomposed to generate ozone; and the generated ozone is utilized to continuously oxidize the malodorous substances. The method can also comprise a source sulfur fixation step: adding a sulfur fixation agent into the anaerobic fermentation system, and reducing the generation of hydrogen sulfide from the source. Nitrogen dioxide can be prepared from steel cylinder gas, industrial waste gas or on site, and the on-site preparation comprises an ammonia water / ammonium salt catalytic oxidation method and a nitric acid reduction method. Through multi-stage cooperation of'source sulfur fixation + NO2 gas-phase oxidation + UV ozone conversion + ozone continuous oxidation ', efficient removal of malodorous gas is achieved, an ozone generator does not need to be additionally arranged, nitrogen dioxide residues are thoroughly eliminated, secondary pollution is avoided, equipment is compact, and the operation cost is low.

The application discloses a river nitric oxide emission calculation method based on a land-river-air simulation, and belongs to the field of environmental engineering. The existing method for measuring river N2O has poor accuracy. A RF regression model is trained by using a nitrogen emission prediction set, a geographical variable prediction set and a climate variable prediction set, and a trained RF regression model is obtained. The nitrogen emission test set, the geographical variable test set and the climate variable test set are input into the trained RF regression model, and the river water concentration of each sub-basin in each region is output. The river hydrological parameters of each sub-basin in each region and the river water concentration of each sub-basin are input into an air-water interface gas exchange model, and the total river nitric oxide emission of each sub-basin in each region is obtained. The application is used for obtaining the total river nitric oxide emission.

The invention discloses a nano spherical SnPd oxide, which is prepared by the following steps: firstly, cross-linking tannic acid and formaldehyde at room temperature by taking F127 as a surfactant, then adding stannous sulfate and palladium nitrate dihydrate for chelation, carrying out hydrothermal reaction to obtain a SnPd phenolic hybrid, and finally, calcining to obtain the nano spherical SnPd oxide, namely SP for short. SP is an n-type semiconductor, and the chemical composition of SP is SnO2 and Pd; the diameter of the mesoporous nanosphere is 100-150nm, and the average pore size of the mesoporous nanosphere is 5-7nm. The preparation method comprises the following steps: 1, preparing the SnPd phenolic hybrid SPZ; 2, preparation of an SnPd oxide SP; according to the SP-based hydrogen sensor and the preparation method thereof, the response value is 14.6, the response time is 1.5-2 seconds, the recovery time is 7-10 seconds, and the minimum hydrogen concentration detection is 0.2 ppm; the cycling stability reaches 30 days; the catalyst has selectivity on ammonia gas, methane, carbon dioxide, carbon monoxide and nitrogen dioxide.

The invention relates to the technical field of adsorbents, in particular to a multi-element gas adsorbent as well as a preparation method and application thereof. The preparation method of the multi-element gas adsorbent provided by the invention is simple, economic and environment-friendly, and is suitable for industrial large-scale production. The prepared adsorbent is regular in morphology and rich in various active sites, and sulfur dioxide, nitrogen dioxide and ammonia gas in air can be effectively adsorbed. Compared with the prior art, the CHO-SBA-PEI multi-element gas adsorbent prepared by the preparation method disclosed by the invention combines a mesoporous structure (high specific surface area and regular pore channels) of SBA-15, amino active sites of PEI and aldehyde groups modified in the pore channels of SBA-15, not only realizes multi-element absorption of SO2, NO2 and NH3, but also has high adsorption capacity, and can effectively purify gas entering a hydrogen energy fuel cell. The preparation process is simple and controllable, does not need special equipment, is easy for large-scale production, and is suitable for industrial application of the hydrogen energy fuel cell air filter.

The present invention relates to a method for removing nitric oxide, nitrogen dioxide, and nitrous oxide from an exhaust gas stream obtained during nitration, the method comprising: (a) removing nitric oxide and nitrogen dioxide from the exhaust gas stream by adding an oxygen-containing gas to the exhaust gas stream to oxidize the nitric oxide in the gas stream to form nitrogen dioxide, thereby obtaining a nitric oxide-deficient gas stream; (b) washing the nitric oxide-deficient gas stream with water to obtain a nitric oxide- and nitrogen dioxide-deficient gas stream; and (c) converting the nitrous oxide in the nitric oxide- and nitrogen dioxide-deficient gas stream into nitrogen and carbon dioxide, and optionally oxygen, in the presence of a nitrous oxide reduction catalyst and in the presence of hydrogen cyanide.

This application provides a method, apparatus, device, and storage medium for monitoring carbon and nitrogen emission data of emission sources. The method acquires observed concentration data of carbon dioxide, nitrogen dioxide, and wind field data for a target emission source; it performs spatiotemporal alignment and correlation of the carbon dioxide and nitrogen dioxide concentration observation data to obtain multiple observation data pairs; if preset plume identification conditions are met, it fits the plume concentration distribution based on the multiple observation data pairs to obtain the linear density of carbon dioxide and the linear density of nitrogen dioxide; using a nitrogen dioxide concentration decay correction model characterizing the chemical change law of nitrogen dioxide during atmospheric transport, it corrects the nitrogen dioxide linear density to obtain the linear density of nitrogen oxides; and based on the carbon dioxide linear density and the nitrogen oxide linear density, it determines the carbon-nitrogen emission rate ratio of the target emission source. The embodiments of this application can improve the accuracy of the carbon-nitrogen emission rate ratio.

The invention belongs to the technical field of wastewater treatment materials, and relates to an adsorbent, in particular to an adsorbent for high-concentration COD biochemical tail water treatment and a preparation method and application thereof.The preparation method comprises the following steps that S1, activated carbon is subjected to nitrogen doping treatment, and nitrogen-doped activated carbon is obtained; s2, carrying out oxidation treatment on the nitrogen-doped activated carbon to obtain oxidized-nitrogen-doped activated carbon; s3, treating the oxidized-nitrogen-doped activated carbon under oxygen-enriched and low-pressure conditions to obtain the adsorbent. The adsorbent provided by the invention not only improves the adsorption effect, but also has high oxygen carrying performance, is used for treating high-concentration COD biochemical tail water, not only can efficiently adsorb suspended particulate matters so as to avoid adverse effects on a subsequent membrane treatment device, but also can release oxygen into the tail water so as to improve the oxygen content in the tail water, so that the treatment effect of the high-concentration COD biochemical tail water is improved. The activity of microorganisms in the aerobic biochemical treatment process is enhanced, so that the treatment effect is improved.

The present application relates to a kind of low-temperature flue gas desulfurization and denitrification device and method thereof, belong to flue gas processing technical field.The device includes fixed desulfurization bed, gas mixer, fixed denitration bed, fan and diffusion tower connected in turn through flue gas pipeline, also set up flue gas analyzer to assist desulfurization and denitrification.The flue gas is first desulfurized by fixed desulfurization bed, then according to the collection data of first flue gas analyzer, adjust the amount of water vapor and ozone injection through gas mixer, to adjust humidity and oxidize nitrogen oxide;Finally, the flue gas is deeply denitrified by fixed denitration bed.The present application adopts all dry process, solves the problem of low-temperature flue gas denitrification, without spraying system and catalyst, by-product is calcium sulfate and calcium nitrate, which can be resource utilization, investment operation cost is low, no waste water and solid waste generation, high efficiency.

The invention discloses a ZnO / ZnS / ZnSO4 nano composite material and a gas sensor based on the ZnO / ZnS / ZnSO4 nano composite material, a ZnO / ZnS heterojunction composite material with rough spherical morphology is prepared by adopting a two-step method, part of ZnS in the ZnO / ZnS heterojunction composite material can be converted into ZnSO4 through subsequent controllable annealing treatment, so that a ZnO / ZnS / ZnSO4 three-layer composite material is obtained, and finally the ZnO / ZnS / ZnSO4 three-layer composite material is prepared into the gas sensor. And high-performance detection of NO2 gas is realized. The prepared sensor has the characteristics of high sensitivity, good selectivity and strong stability, has relatively high response (65) to 5 ppm NO2 at a relatively low working temperature (110 DEG C), can detect nitrogen dioxide gas with extremely low concentration, and has huge potential in the aspect of developing and detecting low-concentration nitrogen dioxide gas.

This application discloses a spatiotemporal prediction algorithm for atmospheric NO2 that combines hyperspectral satellites with artificial intelligence, and relates to the field of pollutant monitoring. The method includes obtaining meteorological monitoring data, hyperspectral satellite monitoring data, and geographic information remote sensing data for a target area; obtaining stratified nitrogen dioxide concentration prediction data for the target area based on the meteorological monitoring data and a preset atmospheric physicochemical model; inverting nitrogen dioxide column concentration data for the target area based on the hyperspectral satellite monitoring data; wherein the spatial resolution of the nitrogen dioxide column concentration data is higher than the spatial resolution of the nitrogen dioxide stratified concentration prediction data; and fusing the nitrogen dioxide stratified concentration prediction data and the nitrogen dioxide column concentration data based on geographic information remote sensing data to obtain nitrogen dioxide concentration prediction data for a target area in the target area at a target time. This application can obtain nitrogen dioxide concentration prediction data with higher spatial resolution and greater accuracy.

The invention discloses an online cryogenic purification process for o-fluorotoluene synthesis tail gas. The process comprises the following steps: generating a synthetic tail gas in a synthesis reactor during the o-fluorotoluene synthesis process; the synthetic tail gas is indirectly cooled to below -80°C by a cryogenic refrigerant at -100°C in a cryogenic unit; condensing and intercepting more than 99wt% of the o-fluorotoluene, nitrogen dioxide, and more than 90wt% of the hydrogen fluoride components; and returning the condensate to the synthesis reactor to continue participating in the synthesis reaction. The cryogenic tail gas exiting the cryogenic unit enters an activated carbon adsorption unit for further adsorption of hydrogen fluoride, and then enters an SCR denitration unit for denitration before being discharged. The process route of the invention is simple, clean, environmentally friendly, stable, efficient, low in operating cost, and high in defluorination and denitration efficiency.

The anti-nitric oxide gas cleaning device comprises a heating shell, a first gas spraying pipe, a lifting mechanism, a heating pipeline, a cooling shell, a second gas spraying pipe and a cooling gas pipeline, the heating shell is of a hollow structure, and through holes are formed in the two sides of the heating shell; the first gas spraying pipe is arranged at the bottom in the heating shell; the lifting mechanism is arranged on the heating shell; the heating pipeline is arranged below the heating shell, and the heating pipeline is communicated with the first gas spraying pipe; the cooling shell is of a hollow structure, and through holes are formed in the two sides of the cooling shell. The second gas ejector pipe is arranged at the bottom in the cooling shell; the cooling gas pipeline is arranged below the cooling shell, and the cooling gas pipeline is communicated with the second gas spraying pipe; through the arrangement, the height of the first gas spraying pipe can be adjusted according to actual conditions, so that comprehensive spraying can be carried out on the electroplating line, and the technical problems that the electroplating line cannot be in full contact with nitrogen, and the position of residual electroplating liquid is oxidized are solved.

Disclosed herein is a device comprising: a media configured to convert nitrogen dioxide into nitric oxide, wherein the media comprises: (a) a support material having a surface area of 350 to 5000 m2 / g; and (b) an antioxidant material.

1. Name of the product in this design: Multi-parameter sensor for mining. 2. Application of this design: This design is mainly used to measure the concentration of various gases such as methane, carbon monoxide, and oxygen in coal mines and environments where gas and coal dust explosions occur. It can also detect the concentration of gases such as carbon dioxide, nitrogen dioxide, ethylene, and acetylene by replacing the detection components, and realize data communication and audible and visual alarms. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D rendering 1.

The invention relates to a method for producing nitric oxide from a gaseous reactant mixture containing oxygen and nitrogen in a reactor comprising a reaction zone (1) with a heat inlet device (2) and at least two regenerator zones (3, 4, 5, 6), each regenerator zone having a low-temperature section at one end and a high-temperature section at the other end of the regenerator zone, the high-temperature sections being fluidly connected to the reaction zone (1), the method comprising the steps of: e) supplying heat through the heat inlet device (2) to the reaction zone (1) until a temperature of 1500 °C to 2500 °C is reached in the reaction zone (1);f) passing the reactant mixture through a first regenerator zone (3) to the reaction zone (1) in which the reactant mixture reacts to form a product mixture, passing the product mixture from the reaction zone (1) through a second regenerator zone (4) and extracting at least a portion of the product mixture from the second regenerator zone (4); g) reversing the flow direction and passing the reactant mixture through the second regenerator zone (4) to the reaction zone (1) in which the reactant mixture reacts to form a product mixture, passing the product mixture from the reaction zone (1) through the first regenerator zone (3) and extracting at least a portion of the product mixture from the first regenerator zone (3); and h) reversing the flow direction and periodically repeating steps b) and c);where the high-temperature sections of the regenerator zones (3, 4, 5, 6) comprise a plurality of channels with a hydraulic diameter of 0.5 mm to 5 mm each, whose inner walls are made of oxide ceramic.;

The present invention relates to a methane removal device and an operation method thereof and, more specifically, to a methane removal device and an operation method thereof, wherein the ability to remove methane is improved by using nitrogen monoxide as a medium, and methane can be stably removed by using a non-noble metal-based catalyst. According to an embodiment of the present invention, a catalyst device necessary for satisfying the regulations for various internal combustion engines using natural gas as fuel can be provided to both revitalize the relevant industrial field and improve the problem of global warming. In addition, according to an embodiment of the present invention, it is possible to solve price problems and the like of conventional exhaust gas reduction devices, which have relied on noble metal catalysts, for removing hydrocarbons.

This application provides a flexible nitrogen dioxide gas sensor based on tungsten disulfide and its fabrication method. The sensor includes a flexible substrate, a flexible electrode, and a tungsten disulfide sensitive film. The flexible electrode is disposed on the same plane of the flexible substrate, and the source and drain adopt an arrayed interdigitated electrode structure. The tungsten disulfide sensitive film covers the channel region between the source and drain, and there is a gap between it and the gate. When a gate voltage is applied, the gate modulates the carrier concentration in the tungsten disulfide channel of the tungsten disulfide sensitive film through a lateral electric field, thereby adjusting the sensitivity to nitrogen dioxide detection. The fabrication process is simplified, and high sensitivity, fast recovery, and flexible wearable adaptation are achieved simultaneously without material modification or external assistance.

The utility model relates to the technical field of nitric acid production, in particular to a waste heat utilization device for stable nitric acid production by a double-pressurization method. The device comprises an evaporator and a primary air filter, the evaporator is connected with a mixer through a precious metal filter, the mixer is connected with a heat exchanger A through an ammoxidation furnace, and the heat exchanger A is connected with a nitric oxide separator through a low-pressure water cooler. The nitrogen oxide separator is connected with the tail gas expansion machine through the absorption tower, the primary air filter is connected with the cooling condenser through the air preheater, the cooling condenser is connected with the mixer through the air compressor, and the tail gas expansion machine is connected with the air preheater through a preheating pipeline. The tail gas expansion machine is connected with the air preheater through the preheating pipeline, middle-low-grade tail gas waste heat exhausted by the tail gas expansion machine is fully utilized, a heat source is provided for the air preheater, and energy consumption in the air treatment link is greatly reduced.

The invention discloses a production process and device for preparing liquid nitrogen tetroxide by recycling nitric oxide. Nitrogen oxides in the tail gas are respectively absorbed by water and alkali liquor to prepare a nitric acid solution and a sodium nitrate-nitrous acid solution; a dilute nitric acid solution and a sodium nitrate and nitrite solution are respectively stored and then mixed to enter a nitric oxide generation tower for reaction to generate nitric oxide gas and a sodium nitrate aqueous solution. The nitric oxide gas is lightly oxidized by using oxygen in the nitric oxide generation tower, then enters the oxidation absorption tower and is heavily oxidized by using concentrated nitric acid, so that the nitric oxide gas is completely converted into nitrogen dioxide gas, and the concentrated nitric acid is used for absorption at the upper section of the oxidation absorption tower to form fuming nitric acid. Fuming nitric acid is heated by steam, and liquid nitrogen tetroxide is produced after condensation. The non-condensable gas contains a small amount of nitrogen oxides, and then passes through a denitration device. By adopting the device and the process, the nitrogen oxide in the recovered waste gas can be effectively ensured to be prepared into liquid nitrogen tetroxide, and the content of the nitrogen oxide in the waste gas outlet is reduced.

A method for treating middle and mature landfill leachate by endogenous denitrification combined autotrophic nitrogen removal process, which belongs to a field of biological treatment of high-ammonia-nitrogen wastewater. The middle and mature landfill leachate firstly enters a PN / ED-SBR reactor to perform in an A / O (anaerobic / aerobic) mode, microorganisms in an anaerobic stage absorb an external carbon source and store the external carbon source as an intracellular carbon source, partial nitrification is performed in the aerobic stage, and the ammonia nitrogen in inlet water is completely oxidized into nitrite nitrogen; after the reaction is finished, an effluent containing nitrite nitrogen and middle and mature landfill leachate are mixed and then enter an AMOX-UASB reactor to perform anammox reaction, the effluent of the reactor is pumped into the PN / ED-SBR reactor again to perform in the anoxic mode, and oxidized nitrogen is removed through endogenous denitrification.

Disclosed herein is a device comprising: a media configured to convert nitrogen dioxide into nitric oxide, wherein the media comprises: (a) a support material having a surface area of 350 to 5000 m2 / g; and (b) an antioxidant material.