192 results about "Nitrous oxide" patented technology

The invention relates to the technical field of biological denitrification, in particular to a nitrogen-doped carbon dot-based microbial electronic control denitrification system and application thereof. The system comprises electron donor microorganisms, electron acceptor microorganisms and nitrogen-doped carbon dots, the nitrogen-doped carbon dots serve as electron mediators outside cells, an efficient extracellular electron transfer network is constructed, and interspecific electron transfer resistance is reduced; meanwhile, the nitrogen-doped carbon dots can regulate and control intracellular electron transport chains and the energy metabolism process, the improvement of the reducing power and the energy level is promoted, and the metabolism mode optimization is realized. By cooperatively regulating and controlling generation, transmission and utilization of electrons under an extreme electron donor limited oligotrophic condition, the system disclosed by the invention can realize efficient denitrification, avoid nitrite accumulation, remarkably inhibit generation of nitrous oxide (N2O), reduce dependence on an external organic carbon source and an electron source, and improve the denitrification efficiency. And a new technical approach is provided for improving the deep denitrification efficiency under the low-carbon condition.

The invention provides a farmland net carbon emission prediction method, a farmland net carbon emission prediction system and a farmland net carbon emission prediction device. The farmland net carbon emission prediction method comprises the following steps: acquiring crop related data, nitrous oxide emission measured data, methane emission measured data and carbon sequestration efficiency measured data of different crops in different planting areas; constructing a nitrous oxide emission prediction model according to the crop related data and nitrous oxide emission measured data; constructing a methane emission prediction model according to the crop related data and the methane emission measured data; constructing a carbon sequestration efficiency prediction model according to the crop related data and the carbon sequestration efficiency measured data; calculating a methane emission predicted value, a nitrous oxide emission predicted value and a carbon sequestration efficiency predicted value; and calculating a net carbon emission predicted value according to the nitrous oxide emission predicted value, the methane emission predicted value, the carbon sequestration efficiency predicted value and a preset net carbon emission model. According to the invention, high-precision and regionalized prediction and evaluation of farmland net carbon emission can be realized.

This invention discloses a platinum-based catalyst, its preparation method, and its application in the catalytic combustion of methane. The preparation method includes reacting a catalyst supported on reduced platinum in a mixed atmosphere of methane / nitrous oxide or methane / nitrous oxide / inert gas at the lowest temperature required for the complete catalytic combustion of methane by nitrous oxide, yielding a catalyst supported on low-oxidation-state platinum. This invention achieves a breakthrough reduction in the temperature for complete methane conversion to below 200°C and maintains long-term stability. This invention enables the simultaneous degradation of two greenhouse gases, methane and nitrous oxide, which is beneficial for mitigating the greenhouse effect. The catalyst of this invention has a simple manufacturing process, excellent performance, and long lifespan, and can be widely used in equipment such as flue gas treatment, natural gas vehicle exhaust treatment, and air purifiers.

Disclosed is a waste gas treatment apparatus for semiconductor and display processes, the apparatus including: a pre-treatment unit having an inlet and an outlet formed therein, and configured to spray a cleaning solution to waste gas introduced through the inlet to primarily treat in the waste gas; a reaction unit configured to simultaneously treat fluorine compounds and nitrous oxide (N2O) in waste gas discharged from the pre-treatment unit; a post-treatment unit configured to spray a cleaning solution to waste gas discharged from the reaction unit to secondarily treat in the waste gas; and a heat exchange unit installed between the pre-treatment unit and the reaction unit.

The present application relates to the field of agricultural environmental protection method, particularly to a method for reducing the pollution of vegetable field soil non-point source and N2O.The method provided by the present application fully considers the carbon and nitrogen content, C / N and cellulose content of different exogenous carbon materials, reduces the application of chemical fertilizer nitrogen under the premise of ensuring the nitrogen supply of vegetables according to the nitrate nitrogen content of vegetable field soil, increases the amount of effective state carbon and the content of holocellulose by optimizing the combination and proportion of different exogenous carbon materials, improves the nitrate nitrogen assimilation of vegetable field soil, reduces the nitrogen leaching and soil N2O emission, and realizes the coordinated reduction and regulation of the pollution of vegetable field soil non-point source and N2O.The method is clear, simple, convenient, easy to implement.

The article of the present design (hereinafter referred to as the "Article") is a tank for a rocket engine for storing oxidizer or fuel for the rocket engine. When storing oxidizer in the Article, some oxidizers, such as nitrous oxide, generate high vapor pressure (up to 7 MPa) at room temperature, placing the tank under significant pressure. Therefore, the design must be carefully designed to ensure sufficient strength. The size of the Article is adjusted appropriately to match the size of the rocket engine, but it is generally expected that the tank will be used with an inner diameter ranging from approximately 10 cm to 50 cm. Furthermore, the Article is preferably made of metal, carbon material, or reinforced resin to withstand the pressure of the oxidizer or fuel. The Article is broadly composed of an outer shell 100, a fuel or oxidizer storage section 200, a columnar section 300, a rocket engine storage section 400, and a support section 500 (see Reference Figure 1). The support section 500 can be provided with appropriate bolt holes to function as a flange for securing the rocket engine. A rocket engine can be stored in the hollow portion inside the tank (storage portion 400 for the rocket engine). The total length of the rocket engine to be stored can be freely set, and can be the same as the total length of the hollow portion inside the tank of the present design, or it can be shorter or longer than the total length of the hollow portion. A flange 410 for fixing the rocket engine can be provided on the inside of the columnar portion 300 as needed, and by adjusting the attachment position of the flange 410 for fixing the rocket engine, rocket engines of various lengths can be fixed from above (see Reference Figure 2).

The ammonium nitrate recycling structure comprises a melting device and a reaction kettle, the melting device is connected with the reaction kettle through an ammonium nitrate delivery pump, a control valve is arranged between the ammonium nitrate delivery pump and the reaction kettle, and a cooling coil is arranged at a decomposed gas rising section in the reaction kettle. The liquid inlet end of the cooling coil pipe is connected with the melting device through an ammonium nitrate circulating pump, the liquid return end of the cooling coil pipe is connected back to the melting device, and an ammonium nitrate solution in the melting device is used as a cooling medium in the cooling coil pipe and exchanges heat with undecomposed ammonium nitrate steam rising along with nitrous oxide in the reaction kettle; the liquid drops formed after condensation return to the reaction kettle for continuous thermal decomposition, the utilization rate of ammonium nitrate is improved, meanwhile, the ammonium nitrate solution serving as a cooling medium in the cooling coil returns to the melting device after heat exchange and temperature rise, and the energy consumption of the melting device for preheating the ammonium nitrate solution is reduced.

The invention discloses preparation of a nickel and cerium doped cobalt-based catalyst and application of the nickel and cerium doped cobalt-based catalyst in catalytic decomposition of nitrous oxide. The nickel and cerium doped cobalt-based catalyst is of a Ni and Ce co-doped spinel type Co3O4 structure and has a mesoporous structure, and the molar ratio of cobalt to nickel to cerium is 1: 0.12: 0.04. The preparation method comprises the following steps: preparing a mixed solution in which the molar ratio of cobalt nitrate to nickel nitrate to cerium nitrate is 1: 0.12: 0.04 by adopting a coprecipitation method, adding sodium carbonate as a coprecipitator into the mixed solution, adjusting the pH value of the mixed solution to 9 while stirring, carrying out coprecipitation and aging, then washing and drying the precipitate, and roasting for 3 hours in an air atmosphere at 300-400 DEG C to obtain the nickel and cerium doped cobalt-based catalyst. The catalyst provided by the invention has good low-temperature nitrous oxide decomposition capability and anti-interference capability under complex working conditions.

The utility model discloses a nitrogen circulating and collecting device. Wherein the nitrous oxide monitoring chamber is hermetically mounted above the plant growth chamber; a space is defined between the nitrous oxide monitoring chamber and the plant growth chamber, a gas inlet and a gas outlet are formed in the nitrous oxide monitoring chamber, and the gas outlet is sequentially connected with a nitrous oxide sensor, a gas pump and the gas inlet through a gas pipeline to form a loop; and the lower end of the nitrous oxide monitoring chamber is integrally and fixedly connected with an annular fitting step. According to the utility model, the interference of man-made disturbance in the acquisition process can be reduced, and the accuracy and reliability of monitoring data are improved.

Aspects and embodiments relate to a therapeutic gas delivery system coupling, a therapeutic gas delivery system including such a coupling, and a method of coupling components of a therapeutic gas delivery system using such a coupling. According to various, but not necessarily all, embodiments there is provided: a therapeutic gas delivery system coupling comprising: an inlet coupleable to a therapeutic gas supply; a delivery outlet configured for delivery of therapeutic gas to a subject; a waste outlet coupleable to a gas extraction system; the coupling comprising a body portion having: a main cavity located between the inlet and the delivery outlet; and an ancillary cavity, located between the main cavity and the waste outlet; wherein: the main cavity and ancillary cavity are linked via an exhalation valve, the exhalation valve being moveable between: a closed position if a pressure differential between the ancillary cavity and the main cavity is greater than or substantially equal to zero, and an open position if a pressure differential between the ancillary cavity and the main cavity is less than zero; and wherein the ancillary cavity further comprises a waste valve, the waste valve being moveable between: an open position if a pressure differential between the ancillary cavity and ambient pressure is less than zero, and a closed position if a pressure differential between the ancillary cavity and ambient pressure is greater than or equal to zero. Arrangements in accordance with described approaches may improve the capture efficiency of exhaled gas, for example, exhaled gas containing nitrous oxide, during and between periods of active administration of therapeutic gases.

The invention relates to the technical field of sewage treatment, and discloses a system and a method for inhibiting nitrous oxide release in a sewage denitrification process, and the system comprises a water inlet unit, a denitrification reaction unit, a dissolved oxygen monitoring module, a central control unit, a gas collection unit and a performance evaluation module. The multi-point arrangement and encryption communication mode of the dissolved oxygen monitoring module improves the accuracy and safety of data acquisition, and the corrosion-resistant design of the gas collection unit and infrared absorption spectrometry detection ensure the reliability of gas analysis. The central control unit realizes the adaptive capability of the system through real-time monitoring and dynamic adjustment, and the performance evaluation module improves the long-term operation efficiency of the system through data analysis and optimization suggestion generation. According to the method, a dissolved oxygen dynamic balance regulation mechanism and a multi-parameter collaborative optimization strategy are introduced, and a real-time monitoring and feedback control technology is combined, so that the problem of generation of byproducts in the nitrification and denitrification process is solved, and the release amount of nitrous oxide is effectively reduced.

The application belongs to the field of catalysts, and provides an alkali metal modified catalyst for decomposing nitrous oxide and a preparation method and application thereof. The catalysts Co / x%K / ZrO2 and Co / y%K / z%Cs / ZrO2 provided by the application both have high activity, good tolerance to impurity gases (NO x , H2O, O2), and excellent catalytic decomposition capacity of N2O under low temperature conditions, and the latter has better comprehensive performance. It is proved that the method of the application is an important strategy for designing an efficient and high-selectivity catalyst system, and solves the problem that there is no cobalt-based catalyst with high efficiency for decomposing N2O while having good tolerance to impurity gases.

The invention discloses a cobalt-based catalyst for producing ammonia through catalytic oxidation of nitrous oxide and nitric oxide as well as a preparation method and application of the cobalt-based catalyst, and belongs to the technical field of catalysts and environmental pollution. The preparation method of the cobalt-based catalyst comprises the following steps: (1) mixing a cobalt source, a carbon-containing nitrogen compound, a precipitator and a solvent for reaction to obtain a precursor solution; (2) putting the precursor solution into a high-pressure reaction kettle for hydrothermal reaction to obtain a solid, namely a precursor; and (3) performing pyrolysis treatment on the precursor in an inert atmosphere to obtain the cobalt-based catalyst. The cobalt-based catalyst prepared by the invention is applied to electrocatalytic conversion from N2O to NH3 for the first time, and shows excellent catalytic activity.

The present application relates to a kind of purification method of nitric oxide gas, comprising the following steps: crude nitric oxide gas is imported into extraction column, and the extraction phase obtained after extraction is imported into resolution column for temperature resolution;Nitric oxide gas resolved is imported into ethanol absorption tower after alkali washing tower and condenser;Again imported into the adsorption tower filled with 13X molecular sieve;After adsorption, the gas is collected into product collection bottle, and the purity of more than 99.99% nitric oxide product is obtained.The present application uses ferrous sulfate solution as extractant, extracts refined nitric oxide, realizes the efficient extraction of nitric oxide by the coordination reaction of ferrous ion and nitric oxide in the purification process, then uses ethanol as absorbent, utilizes the significant difference in solubility of nitric oxide and nitrous oxide in ethanol, can selectively absorb the nitrous oxide impurity difficult to remove, finally uses 13X molecular sieve to further remove nitrous oxide, which is beneficial to reduce disproportionation reaction and improve product purity.

This invention discloses a quantitative method and system for the contribution of river nitrous oxide sources and fate processes, relating to the field of biotechnology. The method includes: collecting surface water and groundwater samples; determining the physicochemical properties of the water samples, including calculating and quantifying the water-to-groundwater exchange ratio; extracting dissolved nitrous oxide from the water samples after determining the physicochemical properties and performing isotope analysis on the nitrous oxide to generate isotope test results; conducting indoor culture experiments on the water samples after completing the isotope analysis to determine whether there are abiotic sources of nitrous oxide in the water samples, generating indoor culture results; and quantifying the contribution of river nitrous oxide sources based on the results of the water-to-groundwater exchange ratio, the isotope test results, and the indoor culture results. This invention effectively analyzes the sources and fate processes of nitrous oxide in rivers and accurately quantifies the contributions of different sources.

A method for purifying air through a pre-purification unit (PPU) of an air separation unit (ASU) system having a pre-PPU cooler located upstream of the PPU to cool the compressed air before it is sent to the PPU, the method may include the steps of passing air through an adsorber of the PPU to pass the air through a bed of adsorbent material within a vessel of the adsorber. In response to a determination that a problem exists with the pre-PPU cooler that causes the pre-PPU cooler to trip or require the pre-PPU cooler to be taken offline, the ASU system should continue to operate at full capacity even if nitrous oxide (N2O) in the air output of the PPU exceeds a first preselected threshold and is below a second preselected threshold associated with carbon dioxide (CO2) breakthrough. The ASU and PPU may be designed to implement embodiments of the method.

This application relates to the field of diesel engine exhaust gas treatment technology, and provides an aftertreatment system and a diesel engine. The aftertreatment system includes a first oxidation catalytic conversion module located downstream of the diesel engine's exhaust outlet; a particulate filter module located downstream of the first oxidation catalytic conversion module; a selective catalytic reduction module located downstream of the particulate filter module for reducing nitrogen oxides in the exhaust gas discharged from the particulate filter module; an ammonia oxidation catalytic module located downstream of the selective catalytic reduction module for oxidizing ammonia in the exhaust gas discharged from the selective catalytic reduction module; and a second oxidation catalytic conversion module located downstream of the ammonia oxidation catalytic module for decomposing nitrous oxide in the exhaust gas discharged from the ammonia oxidation catalytic module. Using this system can significantly improve exhaust gas treatment efficiency.

The article of the present design (hereinafter referred to as the "Article") is a tank for a rocket engine for storing oxidizer or fuel for the rocket engine. When storing oxidizer in the Article, some oxidizers, such as nitrous oxide, generate high vapor pressure (up to 7 MPa) at room temperature, placing the tank under significant pressure. Therefore, the design must be carefully designed to ensure sufficient strength. The size of the Article is adjusted appropriately to match the size of the rocket engine, but it is generally expected that the tank will be used with an inner diameter ranging from approximately 10 cm to 50 cm. Furthermore, the Article is preferably made of metal, carbon material, or reinforced resin to withstand the pressure of the oxidizer or fuel. The Article is broadly composed of an outer shell 100, a fuel or oxidizer storage section 200, a columnar section 300, a rocket engine storage section 400, and a support section 500 (see Reference Figure 1). The support section 500 can be provided with appropriate bolt holes to function as a flange for securing the rocket engine. A rocket engine can be stored in the hollow portion inside the tank (storage portion 400 for the rocket engine). The total length of the rocket engine to be stored can be freely set, and can be the same as the total length of the hollow portion inside the tank of the present design, or it can be shorter or longer than the total length of the hollow portion. A flange 410 for fixing the rocket engine can be provided on the inside of the columnar portion 300 as needed, and by adjusting the attachment position of the flange 410 for fixing the rocket engine, rocket engines of various lengths can be fixed from above (see Reference Figure 2).

Use of a gas hydrate for producing a frozen food foam product, wherein the gas comprises air and / or one or more of carbon dioxide, nitrogen, nitrous oxide, argon and oxygen, preferably the gas comprises carbon dioxide and / or nitrogen.

This invention provides an apparatus and method for recovering nitrous oxide from high-ammonia-nitrogen wastewater using algae-bacteria symbiotic technology. The apparatus includes an aerobic reaction unit and an anoxic reaction unit; the first outlet of the aerobic reaction unit and the inlet of the anoxic reaction unit are connected, and a monovalent anion exchange membrane is installed at the connection point; the aerobic reaction unit is connected to a first gas collection unit via a first gas outlet, and the anoxic reaction unit is connected to a second gas collection unit via a second gas outlet, for recovering nitrous oxide generated in both the aerobic and anoxic reaction units. This invention, by inoculating the aerobic reaction unit with algae-bacteria symbiotic sludge that achieves short-cut nitrification, effectively reduces the aeration energy consumption of short-cut nitrification through microalgae photosynthesis, realizes the recovery of nitrous oxide in the aerobic reaction unit, reduces the denitrification load in the anoxic reaction unit, increases the denitrification conversion rate, and reduces operating costs, embodying a high-efficiency, low-carbon, and environmentally friendly design concept.

This invention relates to the field of biological denitrification technology, and more particularly to a microbial electron-regulated denitrification system based on nitrogen-doped carbon dots and its application. The system comprises electron-donating microorganisms, electron-accepting microorganisms, and nitrogen-doped carbon dots. The nitrogen-doped carbon dots act as extracellular electron mediators, constructing an efficient extracellular electron transport network and reducing interspecies electron transport resistance. Simultaneously, the nitrogen-doped carbon dots can regulate intracellular electron transport chains and energy metabolism processes, promoting increased reducing power and energy levels, and optimizing metabolic patterns. By synergistically regulating electron generation, transport, and utilization under oligotrophic conditions with limited electron donors, this system achieves highly efficient denitrification, avoids nitrite accumulation, and significantly inhibits nitrous oxide (N2O) generation, while reducing dependence on external organic carbon sources and electron sources. This provides a new technical approach for improving the efficiency of deep denitrification under low-carbon conditions.

Systems and methods for controlling an aftertreatment system are provided. A method includes: receiving a first input target and a first input value, the first input target and the first input value associated with a first aftertreatment system component; receiving a second input target and a second input value, the second input target and the second input value associated with a second aftertreatment system component; estimating a nitrous oxide value based on at least the first input value and the second input value; determining a first output target based on at least the first input target, the second input target and the nitrous oxide value; and controlling the aftertreatment system based on the first output target.

The utility model relates to a drying device, in particular to a drying device for preparing high-purity nitrous oxide by recovering adipic acid tail gas, which belongs to the technical field of adipic acid tail gas treatment and comprises a treatment mounting box, a liquid purification filter element is mounted at one end of the treatment mounting box, and a drying filter element is arranged on one side of the liquid purification filter element. A molecular filtering structure is designed on the other side of the drying filter element, a purification treatment filter element is clamped to one side of the molecular filtering structure, a product storage bin is designed at the other end of the treatment mounting box, and an air outlet control pump is mounted at one end of the product storage bin. The device is rapidly connected with an external structure, the use convenience of the device is improved, products pass through the device and are guided, corresponding gas is correspondingly treated and then is collected, and the classified collection efficiency of the products is improved.

Formulation and dispenser systems create dairy based toppings for beverages. The dispensers include a container, valve, and an actuator for the valve. The formulations include a liquid product and a propellant. The liquid product includes a certain percentage of milkfat provided, for example, by heavy cream, skim milk, nonfat dry milk, sweeteners, and an emulsifier. The propellant is nitrous oxide or nitrogen.

The invention provides a catalyst for removing nitrous oxide and a method for removing nitrous oxide. The catalyst comprises metal oxide powder and an iron-copper compound. The iron-copper compound is attached to the surface of the metal oxide powder. The metal oxide powder includes zinc oxide, magnesium oxide, aluminum oxide, or a combination thereof. The molar ratio of iron in the iron-copper compound to metal in the metal oxide powder is 1: 1.3-4.0.

The invention relates to the technical field of chemical production, in particular to a high-purity nitrous oxide rectification process and rectification device.The high-purity nitrous oxide rectification process comprises the following steps that firstly, crude nitrous oxide with the purity being 99.5 wt% is selected and conveyed to a heavy component removal tower A under conveying of a pump body; 2, the temperature of a hot side inlet of a heavy component removal tower reboiler C is 40-50 DEG C, the temperature of a hot side outlet of the heavy component removal tower reboiler C is 30-40 DEG C, the temperature of a cold side inlet of a heavy component removal tower condenser B is 30-40 DEG C, and the temperature of a cold side outlet of the heavy component removal tower condenser B is 20-25 DEG C; 3, most nitrous oxide and other light components are conveyed into a light component removal tower D through a first A outlet of a heavy component removal tower condenser B and a first light component pipeline; 4, the temperature of a hot side inlet of a light component removal tower reboiler F is 40-50 DEG C; 5, nitrous oxide is separated from other light components, and the separated nitrous oxide enters a light component removal tower condenser E to be condensed; the working efficiency of the heavy component removal tower A and the light component removal tower D is improved, and meanwhile, the purity and the stability of nitrous oxide are improved.

The application discloses a purification method for high-purity nitric oxide gas production, which comprises the following steps: adding sulfuric acid drops into a sodium nitrite solution to generate a nitric oxide crude product, removing nitrogen dioxide and carbon dioxide by alkali washing, removing water by pre-cooling, removing nitrogen by deep cooling, and finally obtaining high-purity nitric oxide gas. The residual concentration of nitrous oxide in the purified nitric oxide gas can be reduced to below 3 ppm, and the purity of the nitric oxide reaches above 99.99%. The method can efficiently remove the nitrous oxide impurities, has the advantages of high product yield and simple operation, and has a wide practical application prospect.

The application relates to the technical field of water quality treatment, in particular to an intelligent water quality treatment method and device. A target water quality image corresponding to a target sampling point in target water quality is acquired; the target water quality image is input into a preset water quality data determination model, and target water quality data corresponding to the target water quality is output; the target water quality image and the target water quality data are input into a preset nitrous oxide emission amount determination model, and the nitrous oxide emission amount corresponding to the target water quality is output; and based on the target water quality data and the nitrous oxide emission amount, a preset treatment measure corresponding to the target water quality is determined. The timeliness and accuracy of water quality treatment are improved.

The invention provides a water resource recovery device and method. The water resource recovery device comprises a heat preservation water tank, an evaporation water tank and a nitrous oxide gas inlet pipe. Hot water (sewage) stored in the heat preservation water tank is sprayed into the evaporation water tank through the atomization spray head, nitrous oxide is introduced into the evaporation water tank at the same time, nitrous oxide is injected into water, evaporation of water is accelerated by means of the high water solubility and heat effect of nitrous oxide, the evaporated water is condensed, and pure water can be obtained. Therefore, the sewage can be recycled and utilized; water is sprayed by the atomizing nozzle and is in contact with nitrous oxide, so that the gas-liquid contact area is greatly increased, and the evaporation efficiency is improved; according to the invention, the solar heater is used for heating the sewage to be recycled, so that the energy consumption is reduced, and the goal of environmental protection is achieved; the system further comprises a cyclone separator, and by arranging the cyclone separator, water vapor and nitrous oxide are effectively separated, and the recovery efficiency and purity of water are guaranteed.

The embodiment of the invention provides an industrial wastewater denitrification reactor and method, a reactor main body comprises a main reaction zone and a gas-liquid separation zone, the main reaction zone is divided into an aerobic zone and an anoxic zone, and different requirements of short-cut nitrifying bacteria and anaerobic ammonium oxidation bacteria on dissolved oxygen are met. By utilizing the circulating plate and the baffle plate, the wastewater circulation in the reactor is enhanced, and the stable water quality and pH in the reactor are kept. The filler and the three-phase separation assembly are arranged in the main reaction area, microorganisms can be attached to the filler, a mud-water-gas mixture is separated through the three-phase separation assembly, and sludge loss is prevented. Gas is collected through the gas collecting hood, part of liquid enters the gas-liquid separation area in the gas lifting process, pulse type water distribution, bottom sludge disturbance, mass transfer effect enhancement and bottom sludge deposition prevention are conducted on the liquid through the U-shaped pipe, additional power is not needed in the process, and energy consumption is reduced. The invention provides an operation method for high-efficiency denitrification and nitrous oxide emission reduction of high-ammonia-nitrogen wastewater.