422 results about "Nitrite salt" patented technology

The invention provides a low C / N sewage nitrogen and phosphorus removal method based on MABR-DPR-anaerobic ammonia oxidation, which couples anaerobic, membrane aeration anoxic and anaerobic ammonia oxidation processes, forms an anoxic environment in a water phase of a membrane aeration reactor, and enriches denitrifying phosphorus-accumulating bacteria. And the anaerobic phosphorus release and anoxic denitrification nitrogen and phosphorus removal processes of the denitrifying phosphorus-accumulating bacteria are realized through the backflow of the sludge between the anaerobic tank and the membrane aeration reactor. Nitrite accumulated in effluent of the membrane aeration reactor supplements an electron acceptor for a subsequent anaerobic ammonia oxidation deep denitrification process, and meanwhile, a carbon source is obviously consumed in an anoxic denitrification nitrogen and phosphorus removal process of the membrane aeration reactor, so that inhibition of influent organic matters on an anaerobic ammonia oxidation process is effectively weakened. The process solves the problem that the carbon source is seriously insufficient in the nitrogen and phosphorus removal process of the low C / N sewage, and the stable and efficient nitrogen and phosphorus removal effect can still be maintained under the condition that an external carbon source is not needed.

The invention discloses a nitrifying bacterium agent suitable for aquarium, fishpond and other aquatic industries, the strain of the nitrifying bacterium agent is Glutamicacter nicotianae TJ-X, the nitrifying bacterium agent is preserved in Guangdong Microbial Culture Collection Center on February 12, 2025, and the preservation number is GDMCC NO.65877. The invention further discloses a preparation method of the nitrifying bacterium agent. The nitrifying bacteria TJ-X strain suitable for the aquarium industry can perform heterotrophic nitrification and aerobic denitrification under the condition that the salt content is 5wt%, under the condition of laboratory pure culture, within 8 hours, the removal rate of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen is 99% or above, the COD degradation rate is 81%, the nitrifying bacteria TJ-X strain is suitable for the environment where organic matter, ammonia nitrogen, nitrite and nitrate coexist, and the nitrifying bacteria TJ-X strain can be applied to the aquarium industry. The microbial agent has the functions of degrading organic matters such as excrement of ornamental fish and fish food, converting organic nitrogen into inorganic nitrogen, and simultaneously degrading inorganic nitrogen such as ammonia nitrogen, nitrite nitrogen and nitrate nitrogen into nitrogen. And the strain is high in biological safety, high in environmental adaptability and high in growth density, can be applied to water industries with high organic matter content and inorganic nitrogen, such as the aquarium industry and aquaculture, and has a wide application prospect.

The invention belongs to the technical field of food processing, and particularly relates to fermented beef jerky and a preparation method thereof. The preparation method of the beef jerky comprises the following steps: (1) removing fascia and fat from fresh cattle hind leg meat, washing with clear water, and cutting into meat slices; (2) adding table salt, glucose, white granulated sugar and sodium nitrite into the sliced meat, uniformly mixing, adding a fermentation inoculant which comprises staphylococcus calcaratus, pediococcus acidilactici, bifidobacterium bifidum and Witzia ciliaris, and fermenting; and (3) after fermentation, drying and cooling to obtain the fermented beef jerky. Specific strains are selected to form a fermentation inoculant for fermentation, and the prepared fermented beef jerky is high in free amino acid and soluble peptide content, low in nitrite residual quantity, uniform red brown in color and slightly bright in surface, and belongs to high-quality beef jerky.

The application discloses a method for efficient denitrification and decarburization of kitchen waste and sludge co-fermentation anaerobic digestion effluent, which removes part of COD and ammonia nitrogen in the influent sludge by using a first SNAD, and maintains a certain amount of free ammonia of a certain concentration due to the high concentration of ammonia nitrogen and the high pH of the influent, so as to maintain the inhibition effect on nitrifying bacteria and ensure the conversion of part of the ammonia nitrogen into nitrite nitrogen, and the high activity of anaerobic ammonia oxidation bacteria is ensured in the first SNAD by limiting the aeration amount, so that the ammonia nitrogen and nitrite can be further removed; the effluent enters a nitrification tank, and the ammonia nitrogen is nitrified into nitrate nitrogen under the condition of nitrifying bacteria and sufficient aeration amount, and then enters a denitrification tank, and the denitrification process is carried out under the condition of heterotrophic denitrifying bacteria and sufficient carbon source, so that most of the nitrate nitrogen in the system is converted into nitrogen gas and removed, finally, the clear liquid is discharged after being filtered by an MBR membrane in a membrane tank, so as to achieve the purpose of efficient denitrification and decarburization of kitchen waste anaerobic digestion effluent.

The invention relates to the technical field of wastewater treatment or water quality purification, in particular to a method for synchronously culturing ammonia oxidizing bacteria and nitrite oxidizing bacteria, which comprises the following steps: selecting an inorganic material which is large in specific surface area and can quickly neutralize and release alkalinity as a nitrifying bacteria attachment carrier and an alkalinity supplement / pH regulator; the carrier is dissolved through nitration acid production, carbon dioxide and alkalinity are released, a carbon source and alkalinity required by growth are provided for nitrifying bacteria, and propagation of the nitrifying bacteria is promoted. Ammonia oxidizing bacteria and nitrite oxidizing bacteria are cultured synchronously by controlling the growth speed of the two bacteria in the culture process. By controlling the ammonia nitrogen concentration and nitrite concentration of the effluent at the end of culture to be lower than 50mg / L, sufficient time is provided for nitrite oxidizing bacteria to decompose an intermediate product nitrite, so that the purpose of simultaneously culturing AOB and NOB is achieved.

The utility model belongs to the field of environmental protection and water resource recycling, and particularly relates to an eel breeding tail water purifying and recycling system. The eel breeding tail water purification and cyclic utilization system comprises a pretreatment device, a clear water purification and circulation device and a concentrated water treatment device, the pretreatment device comprises an anaerobic sedimentation tank and a filter I which are communicated in sequence, and the clear water purification and circulation device comprises a hydrolysis acidification tank, a denitrification bed I, an adsorption phosphorus removal bed I and a biological activation tank group which are communicated in sequence; the concentrated water treatment device comprises an air floatation tank, a filter II, a denitrification bed II and an adsorption dephosphorization bed II which are communicated in sequence, a clear water outlet of the filter I is communicated with a water inlet of the hydrolysis acidification tank, and a concentrated water outlet of the filter I is communicated with a water inlet of the air floatation tank. By the adoption of the system, accumulation of nitrogen, phosphorus and nitrite during cyclic utilization of the eel tail water can be reduced, the investment and operation cost is low, and actual application and popularization are facilitated.

The invention relates to the technical field of water treatment, and discloses a sludge quality-divided reflux type aerobic-anoxic sulfur autotrophic activated sludge denitrification process. The process comprises the following steps: wastewater enters a sectional type aerobic tank, the wastewater enters the sectional type aerobic tank, organic matters are removed in a strengthened manner in a first section of aerobic tank, part of ammonia nitrogen is converted into nitrite nitrogen and nitrate nitrogen, and nitrification is strengthened in a second section of aerobic tank, so that the ammonia nitrogen is deeply removed; effluent of the sectional type aerobic tank enters an anoxic tank and is completely mixed with sulfur particles and activated sludge for sulfur autotrophic denitrification; effluent of the anoxic tank enters a secondary sedimentation tank for sedimentation, supernate is discharged, and bottom mud enters a hydrocyclone to be divided into heavy sludge and light sludge; the heavy sludge flows back to the front end of the anoxic tank, the light sludge flows back to the front end of the sectional aerobic tank, and the remaining sludge is discharged. According to the invention, sulfur autotrophic denitrification is deeply integrated into an activated sludge system, so that high-efficiency nitrogen removal without carbon source and internal reflux is realized.

The invention belongs to the field of microorganisms, and particularly relates to a high-efficiency denitrification heterotrophic nitrification-aerobic denitrification klebsiella and a culture method and application thereof.A biological material of the high-efficiency denitrification heterotrophic nitrification-aerobic denitrification klebsiella is named as Klebsiella oxytoca CT4 and is preserved in Guangdong Microbial Culture Collection Center (GDMCC) on July 21, 2025, the preservation number of the Klebsiella oxytoca CT4 is CGMCC NO.9687, and the preservation number of the Klebsiella oxytoca CT4 is CGMCC NO.987. The preservation address is Institute of Microbiology, Guangdong Academy of Sciences, on the fifth floor of building 59, No. 100 courtyard, Xianlie Middle Road, Guangzhou, Guangdong Province; the preservation number of the strain is GDMCCNO: 66723; according to the strain, the ammonia nitrogen removal rate can reach 98.7% through nitrification-denitrification, the nitrite accumulation amount in the whole process is lower than 0.5 mg / L, and accumulation of toxic intermediate products is avoided. The strain has wide environmental adaptability, can keep efficient denitrification activity under the conditions that the pH is 5.0-10.0 and the C / N ratio is 5-30, can tolerate fluctuation of wastewater quality, does not need to repeatedly adjust the pH value when being used for treating aquaculture wastewater with a high C / N ratio (greater than 20), and can still stabilize the total nitrogen removal rate to be 80% or above, so that the addition cost in a conventional process is remarkably reduced.

The invention relates to the technical field of sea flux monitoring, in particular to a pollutant sea flux monitoring and predicting method based on deep learning. The method comprises the following steps: collecting historical flow and pollutant concentration data of a target area according to different time intervals, and locking an area to be analyzed according to the historical flow and pollutant concentration data; then obtaining a regional water sample, extracting concentration and flow data of nitrite, ammonia nitrogen and nitrate, and constructing a training set; after the training set and the real-time flow test set are standardized, deep time sequence learning is carried out through a TCN model, and the future flow and the concentration of each pollutant are predicted; and finally, calculating the into-sea flux based on a prediction result, and realizing high-precision pollutant into-sea flux monitoring and forecasting. According to the method, deep causal convolution and residual feature extraction are performed on long-time sequence data by using the time sequence convolution network, so that the prediction precision and efficiency of the pollutant into-sea flux under complex terrains, extreme climates and human activity dense areas are improved.

The pure membrane MBBR sewage treatment system comprises an anoxic denitrification zone, an anaerobic ammonia oxidation zone, an aerobic oxidation zone, a high-density sedimentation zone, an MBBR biological filtration zone, a backwashing water tank and an equipment room, the anoxic denitrification region is used for carrying out amination reaction, organic matter hydrolysis reaction and denitrification reaction on the sewage and nitrate and nitrite in the anoxic denitrification region; the anaerobic ammonia oxidation zone is used for reacting the sewage with nitrite to generate nitrogen; the aerobic oxidation zone is used for promoting microorganisms to degrade organic matters in sewage and convert ammonia nitrogen; the high-density settling zone is used for separating muddy water in sewage; the MBBR biological filtration area is used for filtering suspended matters in the sewage; the backwashing water tank is used for providing backwashing make-up water for the MBBR biological filtration area; and the equipment room is used for placing disinfection equipment, a fan and a power distribution control system.

The invention discloses a percolate treatment method based on a microalgae coupling nitration process, and belongs to the field of wastewater biological treatment and intelligent control, and the method comprises the following steps: constructing initial reaction conditions suitable for microalgae proliferation and nitration reaction; operating parameters such as ammonia nitrogen concentration, nitrite concentration, dissolved oxygen, temperature and microalgae concentration are collected to form real-time operating data; based on the weighted multi-parameter fitting relationship, calculating an optimal combination of the illumination intensity, the carbon source feeding rate, the cycle ratio and the reaction duration; when the ammonia nitrogen removal rate is continuously lower than a threshold value, calling historical data to carry out trend analysis, and dynamically correcting a fitting weight; applying the correction result to control the illumination condition and the water inlet and outlet proportion; after the operation cycle is finished, updating the fitting model by adopting an incremental learning mode to realize continuous optimization of the control strategy; according to the invention, the nitrogen element removal efficiency of the percolation liquid and the system stability are improved, and the self-adaptive adjustment capability is relatively strong.

The invention discloses a method for realizing deep autotrophic nitrogen removal of sludge digestion liquid based on alternate intermittent aeration of a double-membrane aeration bio-membrane reactor (MABR). The process device comprises a sludge digestion liquid raw water tank, a single-stage double-MABR reactor, two MABR devices and a water outlet tank. According to the method, sludge digestion liquid enters the single-stage double-MABR reactor, the two MABR devices are alternately and intermittently aerated, the state of one aeration and one aeration stopping is always kept, and ammonia nitrogen in raw water is converted into nitrite through ammonia oxidizing bacteria enriched on the inner side of an MABR membrane. And simultaneously supplying to anaerobic ammonium oxidation bacteria enriched on the outer sides of the two MABR membranes through matrix diffusion for denitrification and generation of nitrate. Denitrifying bacteria enriched on the outer side of the MABR membrane utilize raw water organic matters to drive short-cut denitrification to synchronously supply nitrite to anaerobic ammonium oxidation bacteria so as to realize deep autotrophic nitrogen removal. According to the invention, a double-anaerobic ammonia oxidation reaction hot area is constructed through alternate intermittent aeration of double MABRs, and efficient deep autotrophic nitrogen removal of the sludge digestion liquid can be stably realized.

The invention provides a domestic sewage treatment method and system based on shortcut nitrification and anaerobic ammonia oxidation of Anammox bacteria preposed alkali reduction, and relates to the technical field of sewage treatment. The method comprises the following steps: anaerobic treatment: converting an organic suspended solid into an easily degradable carbon source through hydrolytic acidification bacteria; the carbon source is absorbed by denitrifying phosphorus-accumulating bacteria and denitrifying glycogen-accumulating bacteria and is stored as an intracellular carbon source; primary anoxic treatment: reacting ammonia nitrogen with nitrite through Anammox bacteria, and synchronously reducing alkalinity; aerobic treatment: under the condition of low alkalinity, in combination with low dissolved oxygen control, Comamox bacteria oxidize ammonia nitrogen into nitrite and accumulate the nitrite; and secondary anoxic treatment: denitrifying residual oxidation nitrogen into nitrogen by using intracellular carbon through denitrifying glycogen-accumulating bacteria. Through the synergistic effect of the hydrolytic acidification bacteria, the denitrifying phosphorus-accumulating bacteria, the Anammox bacteria, the Commox bacteria and the denitrifying glycogen-accumulating bacteria, efficient nitrogen and phosphorus removal is realized.

According to the plasma high-efficiency water purification system and method suitable for factory-like circulating aquaculture, a water purification unit with a plasma secondary reaction technology as a core is constructed, and a low-energy-consumption cold plasma generator is used for pre-activating gas and introducing the gas into a water body in a micro-nano bubble form; further, an underwater SDBD cold plasma generator is utilized to secondarily excite the activated bubbles to obtain underwater micro-plasmas, and short-life ROS (reactive oxygen species) mainly comprising. OH is efficiently generated through a gas-liquid interface micro-discharge effect, so that pathogenic microorganisms and harmful components such as ammonia nitrogen and nitrite in aquaculture sea and fresh water are quickly and efficiently purified; an electrochemical reaction technology and an internal circulation technology are utilized to construct a plasma by-product elimination unit, the electrochemical reaction technology enables the biotoxicity of a water body to be rapidly reduced to a safe level, and the internal circulation technology avoids the problem of plasma reaction tail gas pollution.

The invention belongs to the technical field of marine corrosion protection, and particularly relates to a multi-metal flushing corrosion inhibitor and a preparation method thereof, benzotriazole and isocyanate propyl triethoxy silane or isocyanate propyl trimethoxy silane are used as raw materials, and a novel benzotriazole corrosion inhibitor containing a silane structure is synthesized through catalysis. The benzotriazole containing the silane structure is compounded with corrosion inhibitors such as organic acid salt, organic acid polymer and organosilane to form the multi-metal flushing corrosion inhibitor for steel, aluminum alloy and copper, which does not contain nitrite, phosphate and heavy metals (lead, cadmium and mercury). When in use, the corrosion inhibitor is diluted to 0.2-0.5%, the corrosion inhibitor is applied to flushing protection of offshore drilling platforms, marine investigation equipment and coastal facilities through flushing and spraying processes, a corrosion inhibitor protective film is formed on the basis of removing a surface salt film, corrosion of multiple metals such as steel, aluminum alloy and copper alloy in a marine atmospheric environment is effectively inhibited, and the corrosion inhibitor has good environmental friendliness.

The invention belongs to the technical field of sludge dewatering, and particularly relates to a sludge acidification conditioning dewatering method. Comprising the following steps: adjusting the pH value of the sludge to 2-4, then adding a nitrite solution, uniformly mixing, standing for reaction so as to generate free nitrous acid in the system, and carrying out selective oxidative degradation, moisture release, filtration and dehydration on extracellular polymeric substances of the sludge through the free nitrous acid, thereby obtaining the dewatered sludge. According to the method, free nitrous acid with a certain concentration is generated in a sludge system under the combined action of an acidification environment and nitrite, and the free nitrous acid is used for breaking sludge extracellular polymeric substances and releasing water adsorbed and wrapped by sludge flocs, so that the dehydration performance of the sludge is remarkably improved, and the dehydration efficiency is improved.

The invention provides a sterile, injectable pharmaceutical composition which includes a therapeutically effective amount of ketamine or a pharmaceutically acceptable salt thereof, a nitrite scavenger, a tonicity agent, and water, wherein the composition contains less than about 300 ppb of an N-nitrosoketamine impurity. The invention also provides a pharmaceutical product which includes a container and the composition of the invention aseptically sealed therein. The invention further provides a process for preparing the composition and product of the invention.

This invention relates to the field of wastewater treatment technology, and more particularly to a method for anaerobic ammonia oxidation denitrification in a conductive membrane bioreactor for wastewater with low concentrations of nitrite. Anaerobic ammonia-oxidizing bacteria are inoculated into a conductive membrane bioreactor; the bioreactor is connected to a DC power supply, with a conductive membrane assembly as the cathode and a three-dimensional porous or fibrous conductive carbon material with a high specific surface area as the anode, and a positive bias is applied to the anode; nitrogen-containing wastewater with a nitrite to ammonia nitrogen molar ratio of 1:1.5 to 1:5 is introduced into the electro-enhanced membrane bioreactor, where the anaerobic ammonia-oxidizing bacteria use the conductive carbon material at the anode as an extracellular electron acceptor for biological denitrification. This invention, based on a conductive membrane bioreactor, achieves efficient denitrification even under nitrite-deficient conditions through a dual approach of "electroadsorption enrichment + electrostimulation enhancement." This method is simple to operate, energy-saving, and has broad application prospects.

The invention relates to the technical field of biology, in particular to a biological substrate modification composition, a preparation as well as a preparation method and application of the biological substrate modification composition. The biological substrate modification composition provided by the invention is prepared from the following components: bacillus subtilis YXSY-01 bacterial powder, sphingomonas aquatic bacteria HD-01 bacterial liquid, bentonite, oyster shell powder, attapulgite, zeolite powder, fish bone meal of raw fish and water. The biological substrate modification composition is prepared from the following raw materials in parts by weight: 20-30% of corn starch, 20-30% of corn starch, 20-30% of corn starch, 20-30% of corn starch, 20-30% of corn starch, 20-30% of corn starch, 20-30% of corn starch, 20-30% of corn starch, 20-30% of corn starch, 20-30% of corn starch and 20-30% of corn starch. The biological substrate modification composition and the preparation provided by the invention have the capabilities of degrading faeces of bred animals and reducing the content of nitrite. The composition and the preparation can reduce the accumulation of excrement of cultured animals in a culture pond, reduce the nitrite content, purify the water quality of the culture pond and reduce the morbidity of the cultured animals.

The invention provides a liquid red direct dye and a preparation method thereof, and the method comprises the following steps: S1, dispersing 2-amino-5-naphthol-7-sulfonic acid and bis (trichloromethyl) carbonate in water, adjusting the pH value of a reaction system by using a first organic base, and reacting to obtain a scarlet acid aqueous solution; s2, dispersing a sulfo aromatic amine compound and nitrite in water, adjusting the pH value of a reaction system by using inorganic acid, reacting to obtain sulfo aromatic amine diazonium salt precipitate, and performing solid-liquid separation to obtain sulfo aromatic amine diazonium salt; and S3, adding the sulfonic aromatic amine diazonium salt in the step S2 into the scarlet acid aqueous solution in the step S1, adjusting the pH value of the reaction system by using second organic alkali, and reacting to obtain the liquid red direct dye. Through the preparation method, the red direct dye which can stably exist in a liquid form and is suitable for direct use can be obtained.

The invention discloses a sewage denitrification component based on compounding of MABR (Membrane Aerated Baffled Reactor) and flora colonization gel membrane filaments. According to the component, oxygen-permeable MABR membrane filaments and flora ecological colonization gel membrane filaments are packaged in a shell. Aerobic bacteria are enriched on the surface of the oxygen-permeable MABR membrane filaments by utilizing the oxygen-permeable characteristic of the oxygen-permeable MABR membrane filaments, so that short-cut nitrification from ammonia nitrogen to nitrite is realized; mutually-communicated micron-sized porous structures are arranged in the flora ecological planting gel membrane filaments, anaerobic ammonium oxidation bacteria can be loaded and protected in a high-density mode, the gel material wraps and slowly releases premixed nutrients, and flora activity is maintained. Through the spatial adjacent arrangement of the two membrane filaments, efficient coupling of short-cut nitrification and anaerobic ammonium oxidation is realized, and anaerobic ammonium oxidation bacteria directly utilize generated nitrite and residual ammonia nitrogen to generate nitrogen, so that efficient denitrification is completed in a single component. The design effectively solves the problems that anaerobic ammonium oxidation bacteria are difficult to enrich and are easily inhibited by dissolved oxygen, and has the advantages of high denitrification efficiency, low energy consumption, quick start, stable operation and the like.

The utility model discloses a short-cut nitrification continuous aeration device which comprises a reaction unit and an aeration unit, the reaction unit comprises a front pool and a circulating mechanism, and the circulating mechanism is communicated with the upper part and the bottom of the front pool and is used for driving liquid at the upper part of the front pool to flow to the bottom of the front pool; the aeration unit comprises an aeration tank, a water inlet mechanism, an aeration mechanism and a reflux mechanism, the water inlet mechanism is communicated with the upper part of the front tank and the aeration tank, liquid in the front tank can flow into the aeration tank through the water inlet mechanism, the aeration mechanism is arranged in the aeration tank for aeration, and the reflux mechanism is communicated with the bottom of the aeration tank and the bottom of the front tank. Compared with the prior art, the short-cut nitrification continuous aeration device provided by the utility model has the advantages that the circulating mechanism is arranged in the reaction tank, and the aeration unit is externally connected to the reaction tank, so that the concentrations of nitrite and free ammonia are jointly diluted by using internal and external reflux, and the inhibition effect of the nitrite and the free ammonia on heterotrophic microorganisms is relieved.

The invention relates to the technical field of analytical chemistry detection, in particular to a method for determining trace nitrite in pharmaceutic adjuvants.The method comprises the steps that an acetonitrile solution, a potassium hydroxide solution, a phosphate buffer solution, a sulfuric acid solution, a 2, 3-diaminonaphthalene solution and a reference substance working solution are provided; the method comprises the following steps: preparing a standard curve solution and a test sample solution, and carrying out ultra-high performance liquid chromatography-tandem mass spectrometry analysis detection: respectively carrying out sample injection detection on the test sample solution and the prepared standard curve solutions with different concentrations under preset chromatographic conditions and mass spectrometry conditions, recording detection results of the standard curve solutions with different concentrations to make a standard curve, and calculating the content of nitrite in the test solution by adopting a standard addition method according to the standard curve and the detection result of the test solution. The method disclosed by the invention can be used for rapidly determining trace nitrite in a drug sample, and can be used for determining the trace nitrite in pharmaceutical adjuvants and detecting the nitrite in drugs.

The invention relates to the technical field of sewage treatment, in particular to a greenhouse gas emission control method and system applied to sewage nitrification treatment.The greenhouse gas emission control method is implemented in an aerobic treatment unit in a sewage digestion treatment system, and in the aerobic treatment unit, the sewage is subjected to nitrification treatment; arranging a front-section measuring point and a rear-section measuring point along the main flow direction of the mixed liquid, and periodically acquiring a first nitrite concentration time sequence at the front-section measuring point and a second nitrite concentration time sequence at the rear-section measuring point respectively; respectively configuring a front-section oxygen supply device and a rear-section oxygen supply device based on the front-section measuring point and the rear-section measuring point, controlling an oxygen supply base line of the front-section oxygen supply device based on the change trend of the first nitrite concentration time sequence and the second nitrite concentration time sequence, and controlling a short-time oxygen reduction control window of the rear-section oxygen supply device; wherein the oxygen supply base line is a preset oxygen supply level executed by the front-section oxygen supply device, and the short-time oxygen reduction control window carries out oxygen supply reduction or intermittent time arrangement for the rear-section oxygen supply device.

The invention relates to a preparation method and application of a copper-nickel double-atom modified MXene-based electrocatalyst. According to the method, CuNiDA / MXene is obtained through acid leaching of CuNi / MXene with hydrochloric acid, copper-nickel diatoms with low metal loading capacity are obtained, and residual copper-nickel alloy nanoparticles in the molten salt etching process are successfully converted into the copper-nickel diatoms to be loaded on an MXene substrate in situ; the obtained copper-nickel diatom modified MXene-based electrocatalyst has copper-nickel diatoms coordinated by oxygen functional groups, so that the adsorption of reaction intermediates is enhanced, and the electrocatalytic performance is further improved. The prepared electrocatalyst shows the ammonia yield as high as 59225 [mu] g h <-1 > mg CuNi atom <-1 > and the Faraday efficiency as high as 94.8% in a reaction system for reducing nitrite into ammonia, and has the industrial prospect of green and sustainable synthesis of ammonia.

1. The name of the design product: full-spectrum multi-parameter water quality online analyzer (SECCO-L-1905). 2. The use of the design product: for analyzing and detecting key water quality indicators such as total phosphorus, total nitrogen, COD, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, etc. in water, online monitoring, fixed and mobile monitoring of water quality in "source-net-plant-river" multiple scenes, and water pollution prevention and supervision. 3. The design points of the design product: the combination of the shape and pattern of the product as a whole. 4. The picture or photo that best indicates the design points: perspective view 1.

The application relates to a method and device for degrading ethion and recycling heavy metals simultaneously based on an endogenous sulfur cycle, and belongs to the technical field of dressing wastewater treatment. The device is mainly composed of sequentially connected MABR and H2-MBfR. In the method, ethion is oxidized and degraded to produce CS2 and ammonia nitrogen under aerobic conditions in the MABR, and the CS2 is further converted into sulfate; the ammonia nitrogen is nitrified into nitrate nitrogen and nitrite nitrogen. Subsequently, the effluent enters the H2-MBfR, and under anaerobic conditions, the nitrate nitrogen and the nitrite nitrogen are reduced into nitrogen gas by taking hydrogen as an electron donor, and the endogenous sulfate is reduced into sulfur ions; the sulfur ions react with heavy metal ions in situ to generate metal sulfide precipitates. Finally, the precipitates are recovered through solid-liquid separation and are reused for metal flotation. The application realizes directional conversion and collaborative removal of pollutants, does not produce secondary pollution, and realizes recycling of heavy metal resources by using the sulfur element of the pollutants.

The invention discloses a NaYF4 type luminescent material as well as a preparation method and application thereof. The preparation method comprises the following steps: reacting a raw material composition in a molten salt medium; wherein the raw material composition comprises a Y source, a Yb source, an Er source and a fluorinating agent, and the molten salt medium comprises nitrite, NaNO3 and KNO3. The preparation method is a one-step method, does not need an organic solvent or a surfactant, is simple and convenient to operate, is strong in red light up-conversion emission, and is suitable for large-scale production and application of a biological imaging system, sensing equipment, a lighting device or energy storage equipment and the like.

The invention discloses a method for high-value utilization of micro mineral powder solid waste, which comprises the following steps of: naturally air-drying micro mineral powder, grinding and sieving to obtain a micro mineral powder raw material; uniformly mixing the micro mineral powder with biomass in different proportions, performing high-temperature oxygen-limited pyrolysis in a muffle furnace, and modifying by phosphoric acid, citric acid, CaCl2 and the like to obtain a micro mineral powder / biomass nano composite material; dispersing the micro mineral powder / biomass nano composite material and chitosan in water, and performing ultrasonic compounding for a period of time to obtain a chitosan / micro mineral powder / biomass nano composite material mixed solution; dispensing the mixed solution on the surface of a glassy carbon electrode to prepare a chemically modified electrode; the electrode is used for detecting dopamine and nitrite substances. The micro mineral powder nano material with high electrocatalytic activity can be prepared and can be used as an electrode material in the fields of batteries, electrochemical sensors, capacitors and the like.

The utility model provides an anaerobic ammonia oxidation reaction system. The reaction system comprises a wastewater treatment system, the wastewater treatment system comprises: a first reactor for removing nitrate nitrogen in wastewater and producing first treated water; the second reactor is used for removing ammonia nitrogen and nitrite nitrogen in the first treated water and producing second treated water; the third reactor is used for adjusting the nitrogen composition and concentration of the second treated water and producing third treated water; and the fourth reactor is used for reducing nitrate nitrogen in the third treated water into nitrogen so as to reduce the concentration of total nitrogen in the effluent. The utility model solves the technical problems that an anaerobic ammonia oxidation water treatment system adopting a traditional activated sludge process is insufficient in total nitrogen treatment capacity during operation, and particularly cannot effectively remove nitrate nitrogen in an anaerobic ammonia oxidation reaction product; in the prior art, the treated water can still contain a certain amount of nitrogen pollutants and cannot meet the requirements of discharged water quality.