253 results about "Nitrite" patented technology

A composite catalyst includes a nickel foam and cobalt, copper, or both electrodeposited on the nickel foam. Making the composite catalyst includes contacting the nickel foam with an aqueous solution comprising copper, cobalt, or both, and electrodepositing nanodomains of copper, cobalt, or both, respectively, on the nickel foam. Electrochemically converting nitrate to ammonia includes contacting an electrode and a cathode comprising the composite catalyst in an electrochemical cell with an aqueous solution including nitrate, adsorbing the nitrate onto the copper, the cobalt, or both, reducing the nitrate to yield nitrite, and reducing the nitrite to yield ammonia.

The present invention belongs to the technical fields of nanomaterials, analytical detection, and food safety, and specifically relates to a single-atom POD-mimicking enzyme nanomaterial, a preparation method thereof, and a food safety detection application. The single-atom POD-mimicking enzyme nanomaterial comprises a noble metal Os and a defective metal oxide, wherein the defective metal oxide is an oxide of metal Cu, and the Os is anchored on the defective metal oxide in the form of single atoms. The present invention also relates to the use of the single-atom POD-mimicking enzyme nanomaterial in the preparation of a detection reagent having POD activity and in the colorimetric detection of hydrogen peroxide or nitrite.

The invention discloses a nitrite electrochemical sensor based on a graphene oxide and polytromethamine composite material and a preparation method and application thereof, and belongs to the field of electrochemical method detection, the preparation method comprises the following steps: uniformly dispensing a graphene oxide suspension on the surface of a glassy carbon electrode, and airing to obtain GO / GCE; putting the GO / GCE, a saturated calomel electrode and a platinum wire electrode into an electrolyte containing tromethamine with a certain concentration, and carrying out electropolymerization by adopting a cyclic voltammetry to obtain Poly (Tris) / GO / GCE; a saturated calomel electrode is used as a reference electrode, a platinum wire electrode is used as a counter electrode, Poly (Tris) / GO / GCE is used as a working electrode, and the nitrite electrochemical sensor is constructed and is more accurate and sensitive in nitrite detection, the linear detection range is 2 * 10 <-6 >-6 * 10 <-3 > mol / L, and the detection limit is 1.00 * 10 <-7 > mol / L.

A method for removing nitrate from chemical high-salinity wastewater salt-separating mother liquor comprises the following steps: introducing the chemical high-salinity wastewater salt-separating mother liquor containing nitrate into an adjusting tank of a structural system of a primary reaction unit, reducing the nitrate into nitrite, pumping the nitrite into a settling tank of the structural system of the primary reaction unit, and settling the nitrite in a settling tank of the structural system of the primary reaction unit; supernate obtained after precipitation is treated wastewater; pumping the treated wastewater into a second-stage regulating tank serving as a structural system of a second-stage reaction unit, and obtaining denitrified water after the reaction is finished; introducing the obtained denitrified wastewater into a third regulating tank serving as a structural system of a post-treatment unit, regulating, introducing into a clarification tank of the post-treatment unit, pumping supernate in the clarification tank into a multi-medium filter of the post-treatment unit, and filtering; produced water filtered by the multi-medium filter is pumped into a storage pool of a structural system of the post-treatment unit, and a finished product is obtained. The method has the advantages that the process flow is simple, the treatment cost is low, and the high-salinity wastewater hybridization-free treatment requirement is met.

The invention discloses a sodium iodide probe assisted gold nanoparticle-polyarginine-polylysine electrochemical sensor and an application thereof. The composite electrode provided by the invention comprises an electrode substrate and a nano composite film modified on the surface of the electrode substrate, the nano composite membrane comprises gold nanoparticles, polyarginine and polylysine. The invention further provides an electrochemical sensor which is constructed by combining the sodium iodide probe and the composite electrode and is used for detecting nitrite. The electrochemical sensor has the advantages of simplicity, rapidness, low detection limit, wide response range, good reproducibility, high selectivity and the like. The electrochemical sensor can be used for measuring the content of nitrite in beef and tap water samples, the recovery rate is satisfactory, and the electrochemical sensor has potential application prospects in the aspects of food safety and environmental protection.

The invention relates to electrochemical treatment of nitrate wastewater, in particular to a preparation method and application of an atomic-scale dispersed copper and cobalt bimetallic catalyst. Comprising the following steps of (1) a Cu precursor preparation method, (2) a Co precursor preparation method, (3) high-temperature pyrolysis and (4) a redundant metal component removal method. The atomic-scale dispersed copper and cobalt bimetallic catalyst disclosed by the invention has relatively high metal loading capacity and relatively high stability. When the Cu-Co-N-C catalyst is applied to the nitrate electroreduction reaction, the toxic by-product nitrite is obviously reduced, the conversion rate of nitrate is obviously improved, and the ammonia nitrogen selectivity is obviously improved.

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 discloses a method for catalyzing carbon-hydrogen bond hydroxyl nitration of an aromatic compound by iron, which comprises the following steps: in a solvent, by taking nitrite as a nitro source, hydrogen peroxide as an oxidizing agent, iron as a catalyst and amino acid and derivatives thereof as ligands, catalyzing the aromatic ring of the aromatic compound to carry out carbon-hydrogen bond hydroxyl nitration reaction; the hydroxyl and nitro disubstituted aromatic compound is generated. According to the method, the hydroxyl and nitro disubstituted aromatic compound can be synthesized in one step, and the steps are simple and convenient; the used catalyst and oxidant are wide in source and low in cost; reaction conditions are mild, and selectivity is high; the nitro source is low in toxicity and high in safety; the functional group compatibility of the substrate is good, and the application range of the substrate is wide; the drug molecules and the drug molecule derivatives can be compatible, so that the hydroxyl nitration reaction of the aromatic compound is realized. According to the method disclosed by the invention, under optimized reaction conditions, the yield of the separated target product can reach 84%.

The invention provides staphylococcus carnosus with high salt tolerance and good fermentation characteristic and application thereof, and belongs to the technical field of microorganism application and meat product processing. The staphylococcus carnosus is staphylococcus carnosus XUCSB 022, the staphylococcus carnosus is preserved in the China General Microbiological Culture Collection Center (CGMCC), the preservation date is June 24, 2025, and the preservation number of the strain is CGMCC No.34991. The staphylococcus carnosus has the advantages that the staphylococcus carnosus XUCSB 022 can be used for preparing the staphylococcus carnosus; the staphylococcus carnosus XUCSB 022 strain disclosed by the invention has the beneficial effects that the staphylococcus carnosus XUCSB 022 strain has the capacity of resisting the salt concentration of 18% ultimately and has the capacity of degrading nitrite in fermented meat, after the meat product is fermented for 15 days, the average value of the residual quantity of the nitrite is 9.77 mg / kg and is reduced by 39.77% compared with a CK group, flavor substances containing aldehydes, ketones, alcohols, esters, acids and other types are generated, and the flavor substances are rich in flavor substances, rich in flavor substances and capable of resisting the salt concentration of 18%. The strain has the characteristics of high safety, excellent fermentation capability and fermentation aroma-producing capability during inoculation of fermented meat, and provides strain resources for production of fermented meat products.

Disclosed is a process for the synthesis of mono- and bis-nitrosylated propanediols, as well as compositions and pharmaceutical formulations that includes the compounds. The process proceeds by reacting a corresponding propanediol that is not nitrosylated with a source of nitrite, optionally in the presence of a suitable acid. When the source of nitrite is an organic nitrite, reacting step is performed in a suitable organic solvent, and when the source of nitrite is an inorganic nitrite, the reacting step is performed in a bi-phasic solvent mixture comprising an aqueous phase and a non-aqueous phase. Also disclosed are methods of treating a condition wherein administration of nitric oxide (NO) has a beneficial effect by administering said compounds, compositions or formulations.

The present invention relates to a method for treating landfill leachate. The steps include: mixing nitrogen-containing landfill leachate and activated sludge and then introducing the mixture into a denitrification tank. Under the condition of inhibiting nitrous oxide reduction, nitrite in the mixture generates nitrous oxide gas dissolved in the sewage under the action of denitrifying bacteria in the denitrification tank; then introducing it into an ammonification tank for gas-liquid separation to collect nitrous oxide gas; and obtaining the sewage after ammonification treatment under the ammonification action of ammonifying functional bacteria in the ammonification tank; further introducing it into a nitrification tank to obtain sewage containing nitrite under the action of nitrosifying bacteria; refluxing to the denitrification tank for cyclic reaction; and then introducing it into a separator for separation to obtain an effluent that can be discharged and sewage that needs to be recycled for treatment. The present invention also relates to a treatment system capable of cooperating with the above treatment method. It changes the existing treatment process of directly discharging nitrogen into the air, turns to collecting nitrous oxide gas, shortens the treatment time, reduces greenhouse gas emissions, and realizes energy recovery.

The invention belongs to the technical field of nanometer materials, analysis and detection and food safety, and particularly relates to a monatomic POD enzyme imitating nanometer material, a preparation method thereof and food safety detection application. The monatomic POD enzyme imitating nanometer material comprises precious metal Os and defective metal oxide, the defective metal oxide is oxide of metal Cu, and the Os is anchored on the defective metal oxide in a monatomic form. The invention also relates to application of the monatomic POD enzyme imitating nano material in preparation of a detection reagent with POD activity and in colorimetric detection of hydrogen peroxide or nitrite.

The invention discloses an electrocatalytic biological denitrification system and denitrification method of a ruthenium-plated electrode composite hollow fiber membrane, and is characterized in that the system comprises a positive / negative electrode chamber arranged on a double-chamber UASB reactor, and a composite biological electrode in the chamber, the composite biological electrode adopts a ruthenium-plated iridium-titanium mesh barrel with a carbon felt wrapped on the periphery as a negative electrode, and the ruthenium-plated iridium-titanium mesh barrel is coated with a hollow fiber membrane. A hollow fiber membrane separation sludge is arranged in the barrel; a ruthenium-iridium-plated titanium mesh is coated with a carbon felt to serve as an anode, electroactive bacteria produce nitrogen / nitrate through anaerobic ammonia oxidation, ammonia nitrogen is electrochemically oxidized into nitrite, anode nitrogen enters a cathode to strengthen mass transfer, cathode nitrite flows back to the anode to be recycled, and efficient conversion and removal of nitrogen are achieved. Compared with the prior art, the system has the advantages of efficient conversion and removal of nitrogen, the pollution of the hollow fiber membrane is reduced and the membrane loss is reduced by utilizing the N2 synthesized by degrading the pre-degradation matrix through the electroactive microorganisms and the additional electrochemical action of the two electrodes, and the system is simple in structure and convenient to maintain and has a good application prospect.

The invention relates to a silicon photoelectric cathode and an electrode system for reducing nitrate into ammonia through photoelectrocatalysis, the silicon photoelectric cathode comprises a Si substrate, an n-type silicon heavily doped layer located on the Si substrate, a passivation protection layer arranged on the n-type silicon heavily doped layer, and a titanium dioxide catalyst layer arranged on the passivation protection layer. An electrolytic reaction system is assembled by taking a platinum electrode as an anode and adopting an acidic electrolyte, nitrate reduction synthesis of ammonia is realized at the cathode, and water is oxidized into oxygen at the anode. The photocatalysis method for producing ammonia through reduction of the nitrate radicals at the cathode has the advantages of low reaction system tank voltage, low energy consumption and the like, and meanwhile, denitrification of wastewater can be realized, and efficient ammonia production is realized.

To provide improved beneficial bacteria that can suppress the growth of pathogens.SOLUTION: The present disclosure provides, inter alia, an optimized strain of Nitrosomonas eutropha (N. eutropha) designated D23, D23-100, or AOB D23-100. N. eutropha bacteria disclosed in the present application have desirable properties, e.g., optimized properties, such as the ability to suppress growth of pathogenic bacteria, and an enhanced ability to produce nitric oxide and nitric oxide precursors. The N. eutropha herein may be used, for instance, to treat diseases associated with low nitrite levels, skin diseases, and diseases caused by pathogenic bacteria.SELECTED DRAWING: Figure 18

The invention provides a method for measuring the content of rhodium in a platinum-rhodium alloy, which comprises the following steps: completely dissolving the platinum-rhodium alloy, then mixing and reacting with nitrite, adjusting the pH value, and carrying out solid-liquid separation to obtain a platinum-rhodium mixed solution; and mixing the platinum-rhodium mixed solution with a coordination precipitator and a polar solvent in sequence, carrying out solid-liquid separation to obtain rhodium precipitate, and calculating the rhodium content in the platinum-rhodium alloy according to the mass of the rhodium precipitate. According to the determination method, measurement errors caused by introduction of metal impurities in the platinum-rhodium alloy are avoided, trace residues of rhodium precipitates in the solution and co-precipitation of other interference metals are also avoided, procedures and used reagents are simple, operation is safe, efficiency is high, use of high-cost and complex precipitants such as metal elementary substances or cobalt hexammine nitrate in the prior art is avoided, and the method is suitable for large-scale popularization and application. Rhodium precipitation is complete, the determination result is accurate, the relative standard deviation is especially smaller than 0.21%, meanwhile, dependence on expensive analysis equipment is not needed, and the method has great application value.

The present invention relates to a reaction device and process for the oxidative coupling of nitrite and CO to produce oxalate ester, which includes a fluidized bed reactor (100) and a fixed bed reactor (200) connected in series, and the fluidized bed reactor (100) is located upstream of the fixed bed reactor (200). The nitrite and CO are successively subjected to two reactions in the fluidized bed reactor and the fixed bed reactor. By using the fluidized bed, good heat removal and temperature control can be achieved, and medium conversion efficiency can be obtained. Then, by connecting a fixed bed reactor in series, high productivity of a single reactor system can be realized, the investment, energy consumption and total cost per unit output can be reduced, and its competitiveness with the petrochemical route can be improved; a large amount of by-product carbonic acid diester can be produced, further improving the economic benefits of the device.

The present invention provides a synthesis method and application of high-value nitrogen-containing compounds by photocatalytic reduction of nitrogen-containing small molecules. The synthesis method comprises the following steps: mixing a photocatalyst, a nitrogen-containing small molecule, and an electron donor, adding or not adding a co-catalyst, preparing a reaction solution, introducing an inert gas into the reaction solution and sealing it, and irradiating the reaction solution with visible light to obtain the high-value nitrogen-containing compound; wherein the nitrogen-containing small molecule comprises one or more of N2, NO, N2O, nitrate, and nitrite; and the photocatalyst comprises one or more of CdS, CdSe, ZnSe, CuInS2, CdSe / ZnS, CdSe / CdS, ZnSe / CdS, CdSe / ZnSe, CdS / ZnS, CdSe / CdS / ZnS, CdS / TiO2, and CdSe / TiO2. This synthesis method can utilize nitrogen-containing small molecules for efficient reduction to obtain high-value nitrogen-containing compounds such as NH3, urea or cyclohexanone oxime, and has high synthetic application value. At the same time, this synthesis method has mild reaction conditions, high visible light utilization rate, cheap and easily available raw materials, and strong applicability.

The invention relates to the technical field of electro-catalysis, in particular to a metal monatomic doped copper-based catalyst and a preparation method and application thereof. The metal single atoms in the catalyst are selected from palladium single atoms, iron single atoms, nickel single atoms or ruthenium single atoms; the doping amount of the metal single atoms is 0.5%-1.0% on the basis of the total mass of the catalyst. The invention provides a novel metal monatomic doped copper-based catalyst, which can be used for catalyzing the reduction of a harmful substance nitrite into a chemical ammonia with an economic added value by using renewable electric power, can solve the problems of nitrite pollution and environment and energy caused by ammonia production by a Have-Bosch method, and realizes the purpose of turning waste into wealth.

The invention discloses an indium-doped cobaltosic oxide catalyst as well as a preparation method and application thereof, and the indium-doped cobaltosic oxide catalyst is prepared according to the following method: 1) dissolving cobalt nitrate, urea and ammonium chloride in deionized water, and stirring to obtain a clear precipitate-free reaction solution; (2) transferring the reaction liquid into a reaction container filled with foamed nickel, and carrying out hydrothermal reaction to obtain the foamed nickel loaded with a sample; 3) washing the foamed nickel loaded with the sample after the reaction with ethanol and water, and drying; 4, the dried foam nickel loaded with the sample is soaked in an indium chloride solution, stirring reaction is conducted, vacuum drying is conducted, and indium-doped cobaltosic oxide is obtained.By means of indium doping, the morphology and components of the indium-doped cobaltosic oxide are regulated and controlled, and the activity and selectivity of the catalyst for electrochemical reduction of nitrite to produce ammonia are improved.

The invention discloses a preparation method and application of a ruthenium-silver-based catalyst, the prepared catalyst constructs a porous microenvironment, a pore confinement silver site is utilized to adsorb nitrite generated by nitric acid conversion, a high-concentration nitrite local environment is further formed, a ruthenium site is responsible for catalytic conversion of nitrite, and the ruthenium site is responsible for catalytic conversion of nitrite. And finally, energy-saving and high-efficiency ammonia preparation is realized.

Disclosed are an ammonia-containing wastewater treatment method and an apparatus, of which a main structure includes an ammonia wastewater holding tank receiving therein ammonia-containing wastewater, at least one ammonia nitrogen detection element detecting ammonia nitrogen content of the ammonia-containing wastewater, at least one aeration device connected to the ammonia wastewater holding tank, an oxygen transfer coefficient calculation device in information connection with the aeration device. The aeration device includes an aeration time controller and a gas flowrate controller. As such, a total mass of oxygen entering the ammonia wastewater treatment tank can be precisely controlled by adjusting output time and output amount per unit time of the aeration device and calculating an oxygen transfer coefficient-aeration flowrate relationship of the aeration device, so that a ratio between the ammonia nitrogen mass and the oxygen mass can be controlled to have ammonium nitrogen first oxidized into nitrite before being oxidized into nitrate.

The invention discloses a preparation method of a low-dimensional composite material for electrochemical sensing detection of nitrite, and relates to the technical field of low-dimensional materials. The preparation method comprises the following steps: by taking selenium powder as a reducing agent, reducing phosphomolybdic acid under specific hydrothermal reaction conditions, and after the reaction is finished, cooling, centrifuging and drying to obtain the MoO3-coated MoSe2 nano composite electrode material. The one-dimensional / two-dimensional structure MoO3atMoSe2 nano composite electrode material prepared by the invention has the advantages of strong specific recognition capability on nitrite, long service life, high sensitivity and excellent detection limit.

The application belongs to the technical field of electrocatalysis, and discloses a bimetallic fluorinated metal organic framework catalyst, a preparation method thereof and application of the catalyst in active oxygen assisted membrane-free electrolytic ammonia oxidation for preparing nitrite, wherein the catalyst is prepared by self-assembly of Cu 2+ , Ni 2+ and a tetrakisfluorophthalic acid ligand through a solvothermal method, and there is a directional electron transfer effect between Cu and Ni. The application utilizes the Cu / Ni bimetallic electron synergistic effect to precisely regulate the d-band center of the catalyst, and a membrane-free electrolysis device is matched to save an expensive proton exchange membrane. The application provides a new efficient and feasible path for green, economical and scaled electrocatalytic synthesis of nitrite.

The invention relates to the technical field of biological metallurgy, in particular to an enhanced leaching method of jorusite. The enhanced leaching method of the jorlybdenum ore comprises the following steps: mixing a liquid phase system containing Fe < 2 + > and a bacterial liquid system formed by acidophilic thiobacillus ferrooxidans with nitrite to obtain a mixed system; then mixing with jorlybdenum ore to obtain a first system; adjusting the pH value of the first system by using an acid solution, and then carrying out oscillation treatment; the concentration of the nitrite in the mixed system is 40-60 mmol / L. According to the enhanced leaching method of the jorlybdenum ore, the complex metabolic process of acidophilic thiobacillus ferrooxidans is combined with nitrite enhanced biological leaching, nitric acid generated by metabolism of the acidophilic thiobacillus ferrooxidans provides acid for molybdenum dissolution of the jorlybdenum ore, generated Fe < 3 + > can be subjected to oxidation-reduction reaction with MoS2 to form stable complex ions [MoO4] < 2->, and the stable complex ions [MoO4] < 2-> are subjected to oxidation-reduction reaction with MoS2. The nitric acid can reinforce the dissolution and leaching of Mo from mineral jorlybdenum ore, so that the leaching effect of Mo is improved.

The invention belongs to the technical field of synthesis of functional crystalline compounds, and discloses a rare earth-polyacid-based compound as well as a preparation method and application thereof. The chemical formula of the rare earth-polyoxometalate compound is [Dy (DMF) 8] [PMo12O40], and the cell parameter is # imgabs0 #. The preparation method comprises the following steps: sequentially adding an H3 [PMo12O40] solution as a lower solution, an organic solvent as a middle buffer layer solution and a mixed solution of Dy (NO3) 3.6 H2O and 4-hydroxyazobenzene-2-carboxylic acid as an upper solution C into a container, keeping a layered state, standing until crystal particles appear on the middle layer of the container, and drying to obtain the rare earth-polyoxometalate compound. The crystal particles are the rare earth-polyacid group compound. The material has excellent electro-catalysis characteristics and can be applied to detection and oxidation reduction of nitrite.

This invention belongs to the field of electrochemical sensor technology for water quality analysis, specifically relating to an integrated sensor for rapid on-site self-separation detection of nitrite in complex seawater. It includes a self-separating membrane, a membrane slot, a screen-printed electrode, and an electrode slot. Two self-separating membranes fixed in the membrane slots and the screen-printed electrode fixed in the electrode slots are connected sequentially in a vertical direction, which is the sample flow direction. The screen-printed electrode is modified with ZnS / VMSF-TMAC material to form a sensing interface with anion-selective permeability. A filtrate storage cavity is formed between the self-separating membrane and the screen-printed electrode to store the filtrate to be tested after filtration through the self-separating membrane. This sensor, when used in complex seawater environments, has a detection range of 0.005-5 mM and retains 85% of the signal after 28 days of storage.

The present invention relates to a liquid nitric oxide releasing solution (NORS) comprised of at least one nitric oxide releasing compound and at least one acidifying agent, wherein the NORS provides an extended release of a therapeutically effective amount of nitric oxide gas (gNO). The present invention also relates to a liquid NORS comprised of at least one nitrite compound having a concentration of no greater than about 0.5% w / v and at least one acidifying agent, wherein the NORS releases a therapeutically effective amount of gNO. The present invention also relates to a method for the treatment of a wound in a human, the method comprising administering to the human a liquid NORS comprised of at least one nitric oxide releasing compound and at least one acidifying agent, wherein the NORS provides an extended release of a therapeutically effective amount of gNO. The present invention also relates to a method for the treatment, prevention, or reduction of incidence of a disease or disorder in a human in need thereof, the method comprising administering to the human a liquid NORS comprised of at least one nitrite compound at a concentration of no greater than about 0.5% w / v and at least one acidifying agent, wherein the NORS releases a therapeutically effective amount of gNO.

The invention relates to a surface modified Fe / Cu-Co3O4 catalyst for nitrite detection and a preparation method thereof, a sensor and application, and the preparation method comprises the following steps: dissolving a cobalt source, an iron source, a copper source, urea and NH4F in deionized water, carrying out a hydrothermal reaction, washing, drying and calcining to obtain a Fe and Cu co-doped Co3O4 nanotube; and pre-hydrolyzing by using a KH792 silane coupling agent ethanol-water solution, and reacting with nanotubes to prepare the surface modified catalyst. The sensor takes carbon cloth or a screen-printed electrode subjected to ultrasonic cleaning and plasma treatment as a substrate, catalyst ink is coated to form a catalytic layer, and the catalytic layer, a platinum counter electrode and a silver / silver chloride reference electrode form a three-electrode system. Through molecular modification and material design, the interfacial force between the catalyst and nitrite is improved, the electrode stability is enhanced, and the catalyst is applied to a disposable printed electrode and portable detection equipment, so that high-sensitivity, stable and portable detection of nitrite is realized.

This utility model discloses an aerobic mixed liquor nitrification and deoxygenation treatment device, including a first nitrification tank. A nitrite-containing bacteria storage tank is located at the top of the first nitrification tank. An inlet pipe is located at the top of one side of the first nitrification tank, and one side of the inlet pipe extends into the interior of the first nitrification tank and is equipped with a sludge-water separation chamber. Through the cooperation of the inlet pipe, sludge discharge pipe, screen, and sludge-water separation chamber, this utility model can separate the sludge mixed in with the mixed liquor during its inflow, while also facilitating the return of the sludge to the treatment tank. Then, through the cooperation of a second discharge pipe, a third pump, a pump installation chamber, a distribution plate, a distribution pipe, a heat dissipation chamber, and a fan, the mixed liquor can be continuously circulated and cooled during the nitrification reaction, thereby maintaining the mixed liquor at 20-30°C to preserve the activity of nitrite-containing bacteria and nitrifying bacteria in the mixed liquor and ensure reaction efficiency.