61 results about "Ammonia nitrogen" patented technology

The embodiment of the application provides a kind of multi-parameter collaborative SCR ammonia injection control method, device, equipment and medium, related to coal-fired flue gas denitration technical field, method includes: obtaining the inlet flue gas flow and inlet nitrogen oxide concentration of flue gas inlet flue, according to inlet flue gas flow and inlet nitrogen oxide concentration, calculate theoretical ammonia nitrogen molar ratio;According to theoretical ammonia nitrogen molar ratio and ammonia water concentration correction coefficient, calculate basic ammonia injection amount;Obtain the reaction data of ammonia water and flue gas in reactor, based on reaction data, dynamically adjust basic ammonia injection amount to obtain final ammonia injection amount, and adjust the ammonia injection amount of ammonia injection pipeline to final ammonia injection amount.The application can realize the accurate and efficient control of the ammonia injection amount of SCR ammonia water denitration system.

The application provides a zinc ion modified zeolite and a preparation method and application thereof. 2+ The modification of the zeolite by the zinc ion can balance the negative charge on the zeolite, so that the modified zeolite has reduced electrostatic repulsion to anions and can have more groups capable of combining with phosphates, and thus has the ability to remove phosphates. 2+ In the process of dynamically adsorbing ammonia nitrogen and phosphates in simulated and actual wastewater in a transfer station, the Thomas model is used for fitting. 2+ The adsorption capacity of the modified zeolite to the simulated water reaches 4.49 mg NH3-N / g and 3.04 mg P / g, and the adsorption capacity of the modified zeolite to the actual water reaches 2.35 mg NH3-N / g and 3.63 mg P / g. 2+ The modified zeolite has good adsorption effect on nitrogen and phosphorus in the continuous flow treatment of the actual water.

The application provides a multistage remediation method for ion-type rare earth tailing area soil composite pollution, aiming at the vertical pollution structure of "surface layer barren-mid-layer heavy metal / radioactivity-deep layer high ammonia nitrogen", and innovatively adopting a "partitioning, different quality, one layer one strategy" strategy. Specifically, the method comprises the following steps: layering and excavating 0-30cm surface layer, 30-50cm mid-layer and >50cm deep layer earthwork; mixing the deep layer earthwork with nitrogen directional conversion coupling material and composite microbial inoculant to construct an ammonia nitrogen targeted removal layer; mixing the mid-layer earthwork with porous matrix coupling stabilizer and functional microbial inoculant to form a heavy metal / radioactivity stable layer; mixing the surface layer earthwork with composite soil conditioner to build a soil improvement layer; and finally planting heavy metal resistant plants. Through the "special material-functional flora-vertical coordination" trinity design, the method realizes accurate, efficient and radical remediation of the whole profile, and avoids resource waste and secondary disturbance.

This invention discloses a method for SCR denitrification control of sintering flue gas based on operational cost optimization, comprising the following steps: S1, establishing an equation for the required heating gas flow rate for SCR denitrification of sintering flue gas based on actual production performance; S2, establishing an ammonia-nitrogen molar ratio model based on SCR denitrification production data of sintering flue gas; S3, obtaining the ammonia consumption based on the ammonia-nitrogen molar ratio model; S4, establishing an SCR denitrification operating cost equation based on the ammonia consumption and heating gas flow rate; S5, optimizing the SCR reaction temperature based on the SCR denitrification operating cost equation, and obtaining the optimized heating gas flow rate and ammonia consumption accordingly; S6, controlling the SCR denitrification of sintering flue gas based on the optimized data from S5. This invention calculates the lowest-cost heating gas and ammonia injection rates based on the actual operating data of the sintering flue gas SCR denitrification device, thereby achieving optimal SCR denitrification operating costs.

This invention relates to the field of operation and maintenance service management technology, and discloses a method and system for operation and maintenance service management of biogas slurry resource utilization, including: Step 1, establishing batch sampling and actual measurement, establishing a plot table, and obtaining nitrogen deficit; Step 2, calculating volume, intensity, and acidification dosage according to the parameter table, locking the process, and generating a prescription list; Step 3, using capacity and safety margin constraints for loading, segmenting by particle size, calculating weights, and locking the scheduling table; Step 4, acidifying and mixing thoroughly and verifying to the target pH, weighing and verifying again upon delivery, issuing a metering slip and shipping; Step 5, retesting pH and ammonia nitrogen to verify the prescription, and if qualified, the on-site parameters are read-only; Step 6, applying at a constant rate according to the prescription, reconciling dual-track metering, and recording faults for exceeding tolerances; Step 7, calculating the loss rate based on delivery, dual-track, and on-site actual measurement, comparing with thresholds for correction, and calculating the achievement rate of the three items. This invention realizes deterministic scheduling, unified metering standards, and traceable closed-loop management of biogas slurry throughout the entire process from delivery to soil application.

The invention belongs to the technical field of pathogenic bacterium wastewater treatment, and particularly relates to a method capable of effectively and synergistically removing ammonia nitrogen and pathogenic bacteria in wastewater. According to the method, in a water body in which ammonia nitrogen and pathogenic bacteria coexist, the two pollutants are removed at the same time by utilizing the oxidation-sterilization synergistic effect of Fe (VI) / PAA. Pollutant ammonium nitrogen in the oxidation system serves as a resource to participate in removal of pathogenic bacteria, the existence of ammonium nitrogen promotes generation of intermediate oxidation products Fe (IV) and Fe (V) of potassium ferrate, then the oxidation inactivation capacity of the system is enhanced, the inactivation time of the pathogenic bacteria in wastewater is effectively shortened, meanwhile, nitrogen is converted into nitrogen, nitrate and the like, the removal rate of NH4 < + > within 30 min reaches 98.6%, and the removal rate of potassium ferrate reaches 98.6%. The total nitrogen removal rate reaches 97.2%, pathogenic bacteria inactivation and ammonium salt removal are carried out at the same time, and a new thought and technology are provided for removing pathogenic bacteria and ammonium salt in water treatment.

The application provides a method for treating Fuling preserved vegetable wastewater by adding alkali-treated diatomite minerals into the Fuling preserved vegetable wastewater; or a method for treating Fuling preserved vegetable wastewater by adding untreated diatomite minerals into the Fuling preserved vegetable wastewater, carrying out solid-liquid separation after a period of reaction, filtering out the solid part, and then adding alkali-treated diatomite minerals into the liquid part. The method can effectively adjust the pH value of the Fuling preserved vegetable wastewater, reduce the content of ammonia nitrogen in the Fuling preserved vegetable wastewater, and improve the purity of the diatomite minerals. The method for treating Fuling preserved vegetable wastewater has the advantages of simplicity, feasibility, low operation cost, and no potential environmental threat, and is a green and environmentally-friendly treatment method, which can effectively improve the treatment effect of the Fuling preserved vegetable wastewater.

The present application belongs to the field of waste resource utilization and hydrometallurgy, and particularly relates to a method for preparing vanadium pentoxide by using organic amine flue gas desulfurization residue, which adopts melamine method flue gas desulfurization residue as a vanadium precipitation agent. Under acidic conditions, the organic amine flue gas desulfurization residue can react with vanadate to generate more stable organic amine vanadate precipitate. After filtration, the precipitate is high-temperature calcined to obtain high-purity powder vanadium pentoxide. Compared with the current ammonium sulfate salt vanadium precipitation method, the present application has higher precipitable vanadium concentration, low ammonia nitrogen concentration in wastewater, and no need for heating in the reaction process, and is an environmentally friendly and low-cost vanadium pentoxide preparation technology.

The utility model relates to a system for treating high-ammonia-nitrogen wastewater and recycling ammonia water resources by utilizing a low-temperature heat source, which comprises a steam stripping tower, a high-ammonia-nitrogen wastewater treatment device, a high-ammonia-nitrogen wastewater treatment device and a low-temperature heat source, the air blower is connected with the middle part of the steam stripping tower; the first heat exchanger exchanges heat with the material discharged from the bottom of the steam stripping tower through a production area low-grade heat source, and the material discharged from the bottom of the steam stripping tower after heat exchange flows back to the top of the steam stripping tower; a material discharged from the top of the steam stripping tower flows into the first spraying absorption tower from the bottom of the first spraying absorption tower; a material discharged from the top of the first spraying absorption tower flows into the second spraying absorption tower from the bottom of the second spraying absorption tower; a material discharged from the top of the second spraying absorption tower flows into the falling film absorption tower from the bottom of the falling film absorption tower. According to the utility model, a low-grade heat source is utilized, and the produced ammonia water can be used in a flue gas denitration process at a production end, so that the cost for ammonium salt treatment caused by acid absorption is avoided.

The invention relates to cold-resistant pseudoarthrobacter LH-LT-1 resistant to heavy metal stress and low temperature as well as a microbial agent and application thereof, and belongs to the technical field of microorganisms. The cold-resistant pseudoarthrobacter LH-LT-1 is classified and named as Pseudarthrobacter psychrotolerans, and the preservation number of the cold-resistant pseudoarthrobacter LH-LT-1 is CGMCC (China General Microbiological Culture Collection Center) No. 32708. The cold-tolerant pseudoarthrobacter LH-LT-1 can amplify gene sequences of ammonia monooxygenase, hydroxylamine oxidoreductase and the like based on gene primers of amoA, hao and the like, and can amplify gene sequences of cold shock protein, cold shock protein, ATP binding protein, excision nuclease and the like based on gene primers of Csp4, cspA II, atpH, uvrC and the like. The strain can tolerate multiple heavy metal ions such as Pb < 2 + >, Ni < 2 + > and Cd < 2 + >, can efficiently reduce ammonia nitrogen under the stress of cadmium ions at 5 DEG C, and provides an efficient and low-cost biological solution for reducing ammonia nitrogen in sewage and wastewater at low temperature of 5 DEG C under the stress of a series of heavy metals represented by cadmium.

The application relates to a kind of water bloom judging methods based on spatial mining, comprising: in the real-time collection of water body data of N regions of water area respectively deploying sensor, wherein N is the integer greater than 1, the water body data includes: environmental parameter water temperature, PH, turbidity, dissolved oxygen, conductivity, high salt index, ammonia nitrogen, total phosphorus and total ammonia;The sensor deployed in the region to be measured in water area is regarded as target sensor, and the sensor deployed in the remaining region in water area is regarded as remaining sensor;The water body data collected by all remaining sensors is sequentially arranged to form remaining water body data sequence;The water body data collected by remaining sensor and remaining water body data sequence are input into trained water bloom judging model to predict whether water bloom occurs in the region to be measured in water area, improve the accuracy of water bloom judgment, improve the timely adoption of emergency measures by environmental management department, reduce the ecological harm and health risk brought by water bloom.

A method for denitrifying ammonia nitrogen wastewater containing chlorine-oxygen free radicals is disclosed. The method uses ruthenium dioxide / titanium dioxide (RuO2 / Ti) as the anode and mesoporous carbon-modified carbon paper (CMK-3 / CP) as the cathode. Sodium sulfate, sodium chloride, and iron-modified graphene oxide as the particle electrode are added to the container containing ammonia nitrogen wastewater, forming a dual-electrode and particle-electrode electrochemical ammonia nitrogen denitrification system. Oxygen is then introduced into the cathode region, and the electrolysis current density is controlled to achieve denitrification of the ammonia nitrogen wastewater. This invention utilizes RuO2 / Ti to oxidize chloride ions to active chlorine (ClO2). ‑ Simultaneously, oxygen is reduced to hydrogen peroxide through mesoporous carbon-modified carbon paper, and the generated active chlorine and hydrogen peroxide are enriched in iron-modified graphene oxide particles. The hydrogen peroxide is further absorbed by the Fe atoms in the iron-modified graphene oxide particles. 2+ / Fe 3+ The cyclic catalytic process generates HO•, which can react with active chlorine to generate ClO•. ClO• can selectively oxidize ammonia nitrogen to nitrogen gas, generating high steady-state concentrations of chloroxygen free radicals, thus achieving efficient denitrification treatment of ammonia nitrogen wastewater.

The invention relates to a low-green-coke heavy oil catalytic cracking catalyst and a preparation method thereof. The catalyst comprises the following components in percentage by weight: 15%-40% of a zirconium-titanium modified Y-type molecular sieve, 10%-30% of a mesoporous cerium oxide matrix, 20%-50% of clay and 5%-15% of an aluminum oxide binder, wherein the zirconium-titanium modified Y-type molecular sieve is prepared through treatment of an organic acid-ionic liquid mixed solution, the cell constant of the molecular sieve is 2.425-2.445 nm, and the ratio of B acid to L acid is larger than or equal to 1.5. The preparation method comprises the following steps: (1) mixing a NaY molecular sieve with a zirconium source and a titanium source, modifying with an ionic liquid, and carrying out a hydrothermal reaction; (2) carrying out acid exchange by using a citric acid-choline ionic liquid solution to obtain a modified molecular sieve; and (3) pulping and molding the modified molecular sieve, mesoporous cerium oxide, clay and a binder, and carrying out gas-phase silanization treatment and roasting. The coke yield of the catalyst is reduced by 15-30%, the heavy oil conversion rate is improved by 8-12%, the wear index of the catalyst is less than or equal to 3.0%, and no ammonia nitrogen is discharged in the preparation process.

The invention relates to the technical field of organic waste treatment and fertilizers, and discloses an enzyme-method rapidly-fermented organic fertilizer and a fermentation method thereof, the organic fertilizer is composed of a fermented and decomposed organic matter and a functional composite carrier; the functional composite carrier takes porous biochar as a substrate, and a surface chemical modification layer for chemically immobilizing ammonia nitrogen, a biomimetic catalytic center for catalytically degrading lignocellulose and a slow-release enzyme / spore capsule for regularly releasing bioactive substances are compounded on the porous biochar. The fermentation method comprises the following steps: mixing the functional composite carrier with organic wastes, and carrying out aerobic fermentation under a film-coated oxygen control condition. According to the invention, through the synergistic effect of chemical nitrogen fixation, chemical catalysis and biodegradation, the technical problems of easy volatilization loss of nitrogen and slow degradation of lignocellulose in traditional fermentation are solved, and the purposes of shortening of the fermentation period, efficient maintenance of nitrogen nutrients and improvement of the decomposition degree of a final product are achieved.

This invention discloses a technical method for alleviating ammonia inhibition during the high-temperature aerobic digestion process of organic solid waste. The method involves reacting fulvic acid with a mixture mainly containing Cu... 2+ Mn 2+ Fe 2+ The enzyme-catalyzed solutions of ions were mixed to prepare a conditioning mother liquor, which was then added to the high-temperature aerobic digestion system for organic solid waste in a specific ratio. The total ammonia nitrogen concentration in the digestate was monitored, and when it rose to 800 mg / L... ‑1 In this process, soluble magnesium salts and phosphogypsum slurry are sequentially added to the treatment system of wet organic solid waste. Heavy magnesium oxide is intermittently added to adjust the pH of the digestion system to 8.0-9.0, and high-temperature aerobic digestion is continued. Then, a silicate nitrogen-fixing agent is added to the digestion system. This invention combines the principles of enhancing oxidase activity with ammonia nitrogen precipitation, adsorption, and ion exchange to alleviate ammonia inhibition during the high-temperature aerobic digestion of wet organic solid waste through multiple pathways. After stabilization treatment, the solid residue obtained from solid-liquid separation has a high degree of humification and nitrogen content, making it suitable for subsequent substrate utilization.

The application discloses a heterotrophic nitrifying bacterium D31, which is classified as Geobacillus proteiniphilus and has a strain preservation number of CGMCC NO.27788. The strain D31 can perform heterotrophic nitrification on a culture medium containing ammonia nitrogen, can grow on a simple carbon and nitrogen source culture medium and oxidize ammonia. The strain D31 can utilize simple nutrients to rapidly proliferate, is inoculated into compost after aerobic fermentation, can efficiently and rapidly oxidize ammonia nitrogen in livestock and poultry manure into nitrate nitrogen in a high-temperature period, reduces the volatilization of nitrogen elements in the form of ammonia gas in the compost, can not only reduce odor emission and protect the environment, but also can maintain nitrogen nutritional elements in the compost, improves compost quality, and has a wide application prospect. The application further provides application of the heterotrophic nitrifying bacterium D31 in livestock and poultry manure composting.

The application discloses a soil Brevibacillus with ammonia oxidation capacity, an ammonia assimilation-ammonia oxidation composite microbial agent and application thereof. The strain is QN6, which has been preserved in the China General Microbiological Culture Collection Center on December 23, 2024, and the preservation number is CGMCC No.33138. The strain can efficiently convert ammonia nitrogen, increase the total nitrogen content and humic acid content of compost, and accelerate humification. The strain and compost bacillus QY6 (CGMCC No.33139) can be compounded into a double-function composite microbial agent to strengthen the ammonia assimilation and ammonia oxidation paths of compost, and provide an important technical breakthrough for solving the dual difficulties of 'difficult to preserve nitrogen and weak to promote decomposition' of compost. The strain and the double-function composite microbial agent can be used for composting, and the obtained compost product can significantly improve the soil nutrient supply capacity, promote crop growth and improve crop quality, and provide an effective technical means for agricultural waste resource utilization, soil improvement and high-quality crop cultivation.

The invention relates to the technical field of wastewater treatment, and particularly discloses a treatment process of high-sulfate organic wastewater. The method comprises the following steps: dividing the high-sulfate organic wastewater into two streams under the driving of an electric field through electrodialysis; transferring sulfate radicals from the high-sulfate organic wastewater to clear water to obtain a concentrated solution rich in the sulfate radicals; and the high-sulfate organic wastewater becomes a desalinated solution rich in COD, and can be discharged after reaching the standard through conventional biochemistry. The high-salt concentrated solution rich in sulfate radicals further comprises a part of COD and ammonia nitrogen which are transferred together, biochemical treatment is carried out through halophiles tolerant to high-concentration salt, the COD and the ammonia nitrogen are oxidized, and after the ammonia nitrogen is oxidized into nitrate nitrogen, a sulfur autotrophic denitrification process is connected to remove total nitrogen. The sulfur recovered from the biochemical treatment of the desalinated liquid is used as a filler and an electron donor of sulfur autotrophic bacteria, NO3-N is reduced into N2, an external carbon source is not needed, meanwhile, up-to-standard emission of total nitrogen and cyclic utilization of sulfur resources are realized, and the method has a wide application prospect.

The invention discloses a modular treatment device for ammonia-nitrogen wastewater, and relates to the field of ammonia-nitrogen wastewater treatment.The modular treatment device comprises a device body, an absorption tower, an aeration system and a dosing system.The device body is internally provided with a denitrification main machine, the side edge of the denitrification main machine is provided with an overflow weir, and the top of the absorption tower is provided with a circulating pipe; the outer wall of the circulating pipe is in flange connection with a circulating pump, the other end of the circulating pipe is provided with a dilute sulphuric acid storage box, the top of the denitrification host is provided with a gas-collecting hood, and the aeration system comprises a heating resistor, an aeration pipe, a temperature control probe and an inorganic ceramic microporous aeration pipe. The modular treatment device for the ammonia-nitrogen wastewater can be used for the field of high-concentration ammonia-nitrogen wastewater treatment, such as livestock and poultry breeding wastewater, rare earth smelting wastewater, coke smelting wastewater and chemical wastewater, low-cost and high-efficiency ammonia-nitrogen removal work can be performed, secondary pollution can be avoided, and resource utilization can be performed.

This application relates to a method for fermenting and processing Baiyao Decoction based on adjusting the ammonia nitrogen content of the fermentation environment, and the Baiyao Decoction processed by this fermentation and processing method. The invention provides precise control over the fermentation process of Baiyao Decoction, primarily characterized by using Aspergillus oryzae TJTSW001 instead of yeast for direct fermentation, and using tea juice with added gallnut powder and glutamic acid as the liquid culture medium for Aspergillus oryzae TJTSW001. Compared with traditional fermentation and processing techniques, this method further increases the gallic acid content in the resulting Baiyao Decoction, while also enhancing its antibacterial activity.

The invention provides a multi-stage remediation method for combined pollution of soil in an ionic type rare earth tailing area, which innovatively adopts a strategy of partitioning, quality dividing and one-layer one-strategy aiming at a vertical pollution structure of surface layer depletion-middle layer heavy metal / radioactivity-deep layer high ammonia nitrogen of the ionic type rare earth tailing area. The method specifically comprises the steps that a 0-30 cm surface layer, a 30-50 cm middle layer and gt are excavated in a layered mode; the soil in the deep layer of 50 cm; the deep earthwork is mixed with a nitrogen directional conversion coupling material and a compound microbial agent, and an ammonia nitrogen targeted removal layer is constructed; the middle-layer earthwork is mixed with a porous matrix coupling stabilizer and a functional microbial agent to form a heavy metal / radioactive stable layer; the surface earthwork is mixed with a composite soil conditioner, and a soil improvement layer is built; and finally, planting heavy metal resistant plants. According to the method, through the three-in-one design of'exclusive material-functional flora-vertical synergy ', accurate, efficient and radical repair of the whole section is achieved, and resource waste and secondary interference are avoided.

The invention discloses a method for detecting the content of ammonium sulfate in an ABC dry powder extinguishing agent. The method comprises the following steps: firstly, qualitatively judging whether a sample contains ammonium sulfate or not through X-ray diffraction; determining the total ammonia nitrogen content by adopting a Nessler's reagent spectrophotometric method, determining the ammonium dihydrogen phosphate content by adopting a gravimetric method, and determining the interference component ammonia nitrogen content by adopting an ion chromatography method; and finally calculating the ammonium sulfate content according to nitrogen conservation. According to the method, impurity interference can be effectively eliminated, the detection result is accurate and reliable, the precision is high (RSD is smaller than or equal to 2%), the adding standard recovery rate ranges from 98.50% to 102.44%, the blank of an ammonium sulfate detection method in the national standard is filled, and the method is suitable for quality control and market supervision of the ABC dry powder extinguishing agent.

This invention discloses a mixed matrix membrane for ammonia separation and its preparation method. A polyether-block polyamide (Pebax) rich in ether bonds and a liquid adsorbent are dissolved in a solvent, and the mixture is refluxed and stirred to obtain a casting solution. The casting solution is then coated onto a substrate, and the solvent is evaporated by heating to obtain the final mixed matrix membrane. Benefiting from the strong ammonia affinity of the Pebax polyether segments and the liquid adsorbent, the mixed matrix membrane obtained by this invention exhibits highly efficient ammonia separation. When separating residual gases from synthetic ammonia, its ammonia permeability can reach as high as 2656.9 Barrer, and its ammonia / nitrogen and ammonia / hydrogen selectivities can reach as high as 594.1 and 150.8, respectively.

The application discloses a kind of composite microbial carrier particles for river ammonia nitrogen treatment and preparation method thereof, the particle includes four-layer structure successively from inside to outside, magnetic counterweight inner core, slow-release function middle layer, composite bacterial population active layer and gel protective shell;Magnetic counterweight inner core is iron oxide-based particle;Slow-release function middle layer includes porous adsorption component, calcium peroxide slow-release microcapsule, slow-release alkaline carbonate component and sodium alginate adhesive, actively build oxygen supply, carbon source supply and pH self-buffering microenvironment in the particle interior;Composite bacterial population active layer is loaded with ammonia-oxidizing bacteria and heterotrophic nitrification-aerobic denitrifying bacteria mixed at a volume ratio of 2:1 to 3:1;Gel protective shell is formed by gel component containing porogen through calcium ion crosslinking solidification.The application can be directly thrown and added, while achieving multiple functions such as anti-scour, anti-predation, low DO adaptation, ammonia nitrogen and total nitrogen synergistic removal, etc., with stable treatment effect, simple construction and low cost.

The invention provides a method for directly preparing biurea from benzophenonetazine, which comprises the following steps of: adding an acid catalyst into a mixed solution of benzophenonetazine, urea and an organic solvent, heating for reaction, and finally centrifugally separating to directly obtain the biurea. The benzophenonetazine and the urea are used as raw materials, the raw materials are dissolved in the reaction solvent, the reaction product biurea is not dissolved in the reaction solvent, the product is easy to separate and purify, inorganic salt and ammonia nitrogen wastewater are not generated in the reaction, the technological process is simple, and the method has the advantages of being easy to implement industrially and remarkable in economic benefit.

The application relates to a method for degrading ammonia nitrogen in wastewater and application, and belongs to the technical field of electrochemical water treatment. The electrode is prepared through a simple hydrothermal synthesis and calcination process. Co(NO3)3.6H2O and Cu(CH3COO)2 are dissolved in deionized water, mixed with a sodium citrate solution, and then subjected to a hydrothermal reaction. Subsequently, the CuCo2O4 is converted through washing, drying and calcination. By adjusting the amount of Co(NO3)3.6H2O and Cu(CH3COO)2, CuCo2O4 samples with different compositions can be prepared. The CuCo2O4 electrode of the application exhibits excellent ammonia nitrogen oxidation performance in the activation of persulfate (PMS), has a high ammonia nitrogen removal rate and nitrogen selectivity. The preparation method is simple, the cost is low, the raw materials are easy to obtain, and the electrode is suitable for large-scale production and application. In addition, the electrode exhibits good reusability in electrochemical treatment of wastewater containing ammonia nitrogen, and provides a new way for efficient, economical and environmentally-friendly wastewater treatment.

The present disclosure provides a method and system for predicting effluent ammonia nitrogen (NH4—N) and an electronic device. The method includes: obtaining data to be tested; and inputting the data to be tested into a trained deep echo state network, to obtain predicted NH4—N concentration. A method for establishing the deep echo state network includes: establishing an original network, where the original network includes a plurality of input variables and reservoirs, and a principal component analysis (PCA) mapping layer is added between adjacent ones of the reservoirs; initializing the original network to obtain an initialized network; performing parameter optimization on the initialized network by a matrix generation method of singular value decomposition and a competitive swarm optimizer (CSO) algorithm, to obtain an optimized network; and training and testing the optimized network, to obtain the trained deep echo state network.

The application provides a gas sensor for ammonia nitrogen gas detection and a preparation method thereof. The gas sensor for ammonia nitrogen gas detection comprises a gas sensitive reaction layer and a porous catalytic conversion layer outward from a substrate. The gas sensitive reaction layer comprises a reference electrode and a sensitive electrode which are symmetrically arranged on the upper surface of the substrate. The porous catalytic conversion layer comprises a porous catalytic film arranged above the gas sensitive reaction layer. A test electrode is further arranged between the sensitive electrode and the substrate. The gas sensor for ammonia nitrogen gas detection can catalyze the reaction of ammonia gas and nitrogen oxide, and simultaneously detect NH3 and NOx by using a single element. x All of the responses are used for detecting the composition and concentration of the residual gas, so as to realize the purpose of regulating the ammonia nitrogen gas content.