110 results about "Nitrite nitrogen" patented technology

The invention belongs to the technical field of sewage treatment, and particularly relates to an anaerobic ammonia oxidation-photoelectric denitrification deep nitrogen removal method. The method comprises the following steps: firstly, adopting a double-chamber reactor; introducing part of sewage into the cathode chamber, carrying out Anammox reaction under a dark state condition to remove ammonia nitrogen and part of nitrite nitrogen, and synchronously generating nitrate nitrogen; turning on a light source to irradiate the anode chamber, exciting photo-induced electrons by a photosensitizer, transmitting the photo-induced electrons to the cathode chamber through an external circuit, and driving the sulfur autotrophic denitrification sludge to reduce residual nitrite nitrogen and nitrate nitrogen generated by Anammox; the total nitrogen removal rate is close to 100%. According to the invention, photo-induced electrons are used as the only denitrification electron donor, so that the addition of a carbon source / sulfide is thoroughly avoided, and the risk of secondary pollution is eliminated. The method is suitable for green low-carbon deep treatment of sludge digestion liquid and pharmaceutical wastewater high-ammonia-nitrogen low-carbon-nitrogen-ratio sewage.

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 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.

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 low-temperature denitrification strain and application of the low-temperature denitrification strain. The strain is Acinetobacter Bragg FX1, and the preservation number of the strain is CGMCC (China General Microbiological Culture Collection Center) NO: 36583. The strain can efficiently remove ammonia nitrogen, nitrate nitrogen and nitrite nitrogen in water at the temperature of 5-30 DEG C, especially shows the optimal denitrification performance at the temperature of about 10 DEG C, and the removal rate of the ammonia nitrogen and the nitrite nitrogen can reach 99% or above. The strain has strong adaptability to low-temperature environment, can tolerate water quality fluctuation of actual sewage, and solves the problems of low denitrification efficiency and unstable operation caused by insufficient microbial activity of sewage treatment plants in low-temperature regions. The strain can be used for preparing a low-temperature sewage denitrification microbial agent, can be directly added into a low-temperature domestic sewage or industrial wastewater treatment system, does not need to depend on high-energy-consumption heating and heat preservation measures, and has remarkable energy-saving and consumption-reducing potential, good environmental adaptability and wide application prospects.

The invention discloses a culture and domestication method of a salt-tolerant heterotrophic nitrification and denitrification microbial agent, and belongs to the technical field of environmental microorganisms. Comprising the following steps: inoculating a heterotrophic nitrification culture medium with a halomonas seed solution, and culturing until a strain reaches a stable growth period to finish domestication. The Halomonas sp. SOB56 strain provided by the invention can be used for effectively removing nitrogen-containing substances in high-salinity wastewater such as mariculture wastewater and the like, and can be adapted to high-salinity wastewater with different salinity through domestication. The removal rates of the strain on ammonia nitrogen and nitrate nitrogen are 99.6% and 94.22% respectively within 36 hours when the strain enters a logarithmic phase under the condition that the temperature is 30 DEG C and the salinity is 5%. The biological nitrogen removal method belongs to the technical field of novel biological nitrogen removal, nitrate nitrogen and nitrite nitrogen are not generated in the ammonia nitrogen removal process, and the biological nitrogen removal method has a good application prospect in actual application of high-salinity wastewater such as mariculture wastewater.

The invention discloses a starting and control method for treating ammonia-nitrogen wastewater by an integrated complete ammoxidation coupling short-cut denitrification anaerobic ammoxidation process, and belongs to the field of wastewater biological treatment. The starting method adopts a step-by-step inoculation strategy, and comprises the following steps: firstly, inoculating complete ammoxidation sludge in the SBR reactor for low-oxygen domestication, and after successful starting, supplementing and inoculating short-cut denitrification coupled anaerobic ammoxidation sludge. The control method adopts a sectional water inlet mode, and comprises the following steps: a first part of ammonia nitrogen wastewater firstly enters an integrated SBR (Sequencing Batch Reactor), and ammonia nitrogen is directly oxidized into nitrate nitrogen through complete ammonia oxidizing bacteria (Comammox) under the condition of low dissolved oxygen; aeration is stopped, a carbon source is added for short-cut denitrification, and nitrate nitrogen is reduced into nitrite nitrogen; and then pumping a second part of ammonia nitrogen wastewater, and converting ammonia nitrogen in the wastewater and accumulated nitrite nitrogen into nitrogen by using anaerobic ammonium oxidation bacteria, so as to remove the ammonia nitrogen in the wastewater. According to the invention, deep denitrification is realized under the condition of saving energy consumption and a carbon source.

A device and method for treating urban domestic sewage based on a two-stage combined process of partial denitrification-anammox belong to the field of biological sewage treatment. The device includes a raw water tank, a sequencing batch biofilm reactor (SBBR), an intermediate water tank, an up-flow anaerobic sludge bed (UASB) and a water outlet tank. A part of urban domestic sewage enters the SBBR and is mixed with residual sewage in the last cycle, a partial denitrification-anammox reaction is carried out under a stirring condition to remove nitrate nitrogen and a part of ammonia nitrogen, followed by a nitrification under an aeration condition to completely convert ammonia nitrogen into nitrate nitrogen, and effluent enters the intermediate water tank; and the other part of the urban domestic sewage is mixed with the effluent of the SBBR and continuously enters the UASB, and nitrite nitrogen, which is generated by nitrate nitrogen reduction, and ammonia nitrogen, are removed by means of anammox. According to the present invention, with no need of adding an external carbon source, organic matters in sewage can be effectively removed, the nitrogen removal efficiency of urban domestic sewage is improved, and efficient and low-consumption nitrogen removal is realized.

The present application relates to sewage treatment device technical field, especially to a kind of sludge landfill pit high nitrogen pollution leachate's enhanced denitrification method. First, mesh cover box and related biological gel particles are placed on the float, and the denitrification device is prepared;Second, the water body is introduced and the biological denitrification process is realized by propeller and steering mechanism. Then, according to the water quality, the denitrification area is automatically adjusted, and the denitrification effect is optimized. Finally, through the solar power generation and driving control steps, the device is energy self-sufficient, and the driving route and speed are controlled by the central processing unit, to maximize the denitrification efficiency. The present application closely combines short-cut nitrification and anaerobic ammonia oxidation, and uses the small unit structure of the capsule to realize the way that short-cut nitrification and anaerobic ammonia oxidation can be directly coupled in wastewater treatment. The contribution ratio of short-cut nitrification and anaerobic ammonia oxidation can be automatically adjusted according to the proportion of ammonia nitrogen and nitrite nitrogen in the water body. The present application has the advantages of remote operation, no need for external carbon source, saving oxygen supply energy consumption, high denitrification efficiency, no need for sludge discharge, strong adaptability, etc., and achieves the effect of pollution reduction and carbon reduction.

The present application relates to a kind of for urban sewage low-carbon deep denitrification improved AOA device and utilize the composition to sludge deep dewatering method.The device described in the present application is sequentially connected to be provided with water inlet tank, anaerobic tank, the aerobic tank with MABR membrane module, anoxic tank and secondary sedimentation tank, the present application is provided with the aerobic tank with MABR membrane module, and it is more easy to realize partial nitrification of ammonia nitrogen for processing urban sewage, and the remaining ammonia nitrogen can be used for anaerobic ammonia oxidation.In addition, under low DO concentration, compared with the aerobic tank in the prior art, the N2O generated by the MABR membrane module provided in the present application will be lower, by utilizing internal carbon source PHA and glycogen for short-term denitrification to generate nitrite nitrogen for anaerobic ammonia oxidation bacteria to utilize, for mainstream urban sewage anaerobic ammonia oxidation denitrification provides a new way.

The application discloses a method for wastewater denitrification by ion beam superposition biological method, comprising the following steps: (1) air ionization is used to generate charged air particles, and the charged air particles are dissolved into industrial wastewater after being treated by a magnetic field to obtain solution A; the air ionization and the magnetic field treatment are performed by an anion beam device; the magnetic field treatment is a combined frequency magnetic field treatment; (2) the solution A obtained in the step (1) is placed into a wastewater denitrification biochemical tank to perform microbial treatment; the microbial treatment comprises microbial nitrification treatment and denitrification treatment. The method for wastewater denitrification by ion beam superposition biological method can selectively strengthen the action of microbial population and rapidly activate microorganisms by providing charged air particles and biological electromagnetic waves in wastewater; meanwhile, the method can provide the required electrons for reduction of nitrite nitrogen to nitrogen, realize the functions of simultaneous nitrification and denitrification in the case of lacking carbon source, improve the ammonia nitrogen removal efficiency and total nitrogen removal efficiency of low C / N ratio wastewater, and significantly reduce the operation cost.

The present application relates to the technical field of aquatic environment, and in particular to a lactic acid bacteria, a separation and screening method and application, wherein the lactic acid bacteria is Lacticaseibacillus casei FC-5 with a preservation number of CCTCC NO: M 2026260, and the present application further provides a method for application of the lactic acid bacteria and chlorella in bio-floc technology, and solves the problem of serious threat of accumulation of nitrite nitrogen to aquatic animals in aquatic environment, and also solves the problem of serious threat of accumulation of ammonium nitrogen to aquatic animals.

The utility model discloses a kind of sulfur autotrophy denitrification nitrogen-removal fluidized bed systems, relate to wastewater treatment technical field.The utility model includes the nitrogen-removal fluidized pool with first water inlet and first water outlet, the nitrogen-removal fluidized pool includes the fluidization chamber and flocculation chamber separated by partition, the lower portion of fluidization chamber and flocculation chamber is communicated, fluidization chamber and flocculation chamber are respectively provided with stirring mechanism, the upper portion of fluidization chamber is with the first water inlet and first dosing pipe being communicated with its inner cavity, the upper portion of flocculation chamber is with first water outlet and second dosing pipe, the first dosing pipe is set to the side adjacent to first water inlet, second dosing pipe is set to the side adjacent to partition, first water outlet is set to the side far away, flocculation chamber upper portion, first water outlet below is set to cover the first filter mechanism of its entire cross section.The lower portion of fluidization chamber and flocculation chamber in the utility model is provided with sulfur-based powder filler layer, and nitrate nitrogen and nitrite nitrogen in wastewater can be removed.

The invention belongs to the field of environmental microbiological technology and wastewater biological treatment, and particularly discloses a synchronous nitrification and denitrification acid-eating bacterium and application thereof in wastewater treatment. The strain is Acidovorax sp. LM14, and is preserved in China Center for Type Culture Collection, called CCTCC for short, the preservation address is Wuhan University Life Science College, Wuchang District, Wuhan City, Hubei Province, the preservation date is November 10, 2025, and the preservation number is CCTCC M 20252521. The strain has a heterotrophic nitrification-aerobic denitrification capability, can synchronously and efficiently remove ammonia nitrogen, nitrite nitrogen and nitrate nitrogen under an aerobic condition, and still can efficiently remove wastewater with the ammonia nitrogen concentration of 500mg / L. Meanwhile, the strain can effectively degrade aromatic pollutants such as phenol, and the degradation rate exceeds 90% when the concentration of phenol is as high as 500mg / L. In addition, the LM14 still keeps high denitrification activity under the condition of low carbon nitrogen ratio, and has a wide application range to pH and temperature.

This invention relates to the field of wastewater biological treatment technology, specifically to a device and method for improving the autotrophic denitrification performance of a MABR reactor. It employs a composite membrane module combining a curtain-type silica gel filament membrane with excellent oxygen permeability with a spatial three-dimensional mesh packing material that facilitates the attachment of anaerobic ammonia-oxidizing bacteria, thereby coupling part of the nitrification reaction with the anaerobic ammonia oxidation reaction. Through the circulating reaction zone and membrane reaction zone within the reactor, nitrate nitrogen generated by anaerobic ammonia oxidation and excess nitrite nitrogen during instability adjustment are circulated and removed, thus improving the total nitrogen removal efficiency of the reactor. By adding appropriate amounts of sodium nitrite solution at appropriate times, the free nitrite concentration in the reactor mixture is increased. Simultaneously, the intermittent aeration ratio of the MABR is controlled to achieve synergistic inhibition of nitrite-oxidizing bacteria activity by low dissolved oxygen and high free nitrite, allowing the unstable short-range nitrification reaction to recover and improving the autotrophic denitrification performance of the reactor.

The invention relates to the technical field of chemical component detection, and particularly discloses fluorescent test paper, a fluorescence analysis method and a fluorescence analysis device for visual online detection of soil nitrate nitrogen. According to the test paper, nitrate nitrogen is reduced into nitrite nitrogen by adopting zinc powder and a cadmium chloride solution, and then the nitrite nitrogen is dropwise added to fluorescent test paper prepared by soaking a mixed solution of para aminobenzoic acid, N-phenyl-1-naphthylamine and hydrochloric acid; under an acidic condition, nitrite nitrogen and para aminobenzoic acid generate diazonium salt, and then the diazonium salt reacts with N-phenyl-1-naphthylamine to form an azo compound, so that the original blue fluorescence on the test paper is gradually weakened along with the increase of the concentration of the nitrate nitrogen. According to the method, high-sensitivity and specific recognition of nitrate nitrogen is realized. And in combination with color identification and data analysis software of a smart phone, a portable and low-cost field detection system is constructed, and an efficient and practical new technical means is provided for visual quantitative detection of soil nitrate nitrogen.

This invention relates to the field of wastewater treatment technology, specifically to a short-range nitrifying bacterium and its application in wastewater denitrification treatment. The short-range nitrifying bacterium is taxonomically classified as *Klebsiella grimonella* (…). Klebsiella grimontii The strain, named A5, is deposited at the China Center for Type Culture Collection (CCTCC) with accession number M 2025642, dated March 31, 2025. This invention's short-cut nitrifying bacteria can oxidize ammonia nitrogen to nitrite nitrogen, preventing further oxidation of nitrite nitrogen to nitrate nitrogen. It can be used for short-cut nitrification treatment of wastewater, achieving efficient conversion of ammonia nitrogen to nitrite nitrogen even at high ammonia nitrogen concentrations and over a wide temperature and pH range, demonstrating promising application prospects in wastewater denitrification.

The invention provides cold-resistant bacillus subtilis for pond culture under a low-temperature condition. The preservation number of the cold-resistant bacillus subtilis is CGMCC (China General Microbiological Culture Collection Center) No.36068. The cold-resistant bacillus subtilis strain provided by the invention has remarkable comprehensive application advantages, can keep higher growth activity and metabolic capability in a low-temperature environment, and continuously plays a water body purification function. Ammonia nitrogen and nitrite nitrogen in a water body can be efficiently degraded, the environment of the aquatic water body is remarkably improved by promoting the nitrogen circulation process, and harm caused by nitrogen pollution is reduced. The strain is high in safety, does not cause poison or stress reaction to bred animals even under the condition of high-concentration use, and has good ecological safety and environmental friendliness.

The utility model relates to the technical field of anaerobic ammonia oxidation reactor denitrification devices, and discloses an anaerobic ammonia oxidation reactor denitrification device which comprises a workbench and a reactor box, a stirring assembly is arranged in the reactor box, and the stirring assembly comprises a motor, a driven bevel gear, an inner gear ring and a placing frame. After wastewater containing ammonia nitrogen and nitrite nitrogen flows into a reactor box, a worker starts a motor to drive a driving bevel gear to rotate, then a driven bevel gear is driven to rotate, a rotating gear circumferentially rotates in an inner gear ring, meanwhile, the worker starts a driving piece, the driving piece enables a stirring block and a stirring blade to rotate, and the stirring block and the stirring blade rotate; ammonia nitrogen and nitrite nitrogen wastewater in the reactor box are mixed and stirred, so that the ammonia nitrogen and the nitrite nitrogen can be distributed more uniformly in the reactor box, anaerobic ammonium oxidation bacteria can be in full contact with reactants, the reaction efficiency is further improved, and sludge precipitation can be prevented.

The granular sludge ager is additionally provided with a granular sludge aging module, and the granular sludge ager comprises a sludge leading-out unit, a matrix blending unit and an aged sludge processing unit, the sludge leading-out unit is embedded into the bottom end of the interior of the vertical flow reactor; the matrix blending unit is used for guiding ammonia nitrogen and nitrite nitrogen into the vertical flow reactor to regulate and control water distribution, granulated sludge is obtained after reaction in the vertical flow reactor, and sludge with the target particle size is guided out through the sludge guiding-out unit; and the cured sludge processing unit is used for performing post-treatment on the sludge with the target particle size to obtain a cured granular sludge product. Ammonia nitrogen and nitrite nitrogen regulation and control distribution water is used as input, after the reaction of the vertical flow reactor, sludge is guided out through the sludge guide-out unit at the bottom end, and is treated through the cured sludge processing unit to form a cured granular sludge product, so that the problems of shortage and high selling price of the existing ammoxidation cured sludge are solved.

The invention provides a sea cucumber pond culture monitoring system based on Internet of Things, which comprises a hardware deployment and networking module used for constructing a monitoring network covering a pond and providing a data acquisition and transmission basis for the system, and focuses on sea cucumber survival core water quality parameters such as ammonia nitrogen, nitrite nitrogen, hydrogen sulfide, water temperature, pH, dissolved oxygen and the like to construct a real-time monitoring network; according to the method, fatal risk points such as hydrogen sulfide highly toxic accumulation, nitrite nitrogen chronic poisoning and suffocation due to sudden drop of dissolved oxygen are accurately captured, compound water quality deterioration is intelligently identified through multi-parameter threshold linkage and a rule engine, and the targeted monitoring and analysis remarkably improves the early-stage discovery and early-warning capability of invisible killer in holothurian culture, so that the early-stage detection and early-warning capability of the invisible killer in holothurian culture is improved. And large-scale loss is effectively avoided.

This utility model discloses a device for detecting nitrite nitrogen content in water, relating to the field of nitrite nitrogen detection technology. It includes a base plate, a support frame fixedly connected to the top of the base plate, a water storage tank fixedly connected to the top of the support frame, a motor fixedly connected to the side of the support frame, and a bearing fixedly connected to the top of the water storage tank. A filter screen is fixedly connected inside the bearing and rotatably connected to the water storage tank via the bearing. The filter screen is funnel-shaped and located inside the water storage tank. This utility model involves removing the sealing cap, injecting the solution to be tested into the filter screen through the feed pipe, then replacing the sealing cap, and starting the motor. The motor drives a drive shaft to rotate via pulleys and belts, which in turn drives the filter screen to rotate. Through the rotation of the filter screen, water is thrown out due to centrifugal force and flows into the water storage tank, while solid impurities remain inside the filter screen, thus quickly separating impurities from the water.

The invention discloses a sludge cracking short-cut nitrification and denitrification landfill leachate treatment device and a control method, and belongs to the technical field of sewage treatment. Comprising a control box as well as a raw water tank, a UASB reactor, an A / O reactor and a sedimentation tank which are sequentially arranged along a water flow direction, a sludge outlet pipeline of the sedimentation tank is connected with the A / O reactor through a sludge reflux pump to maintain sludge concentration, part of supernate of the sedimentation tank is connected with the UASB reactor through a nitrification liquid reflux pump to participate in reaction, and the other part of supernate is discharged through an external water outlet. The excess sludge tank is connected with the UASB reactor through the excess sludge pump, the sodium citrate tank is connected with the UASB reactor through the sodium citrate liquid inlet pump, sludge cracking is enhanced through the synergistic effect of sodium citrate and free nitrite nitrogen, and the control box is connected with the pumps and controls the pumps to operate. Through the synergistic effect of the UASB and the AO reactor, combined operation of sludge cracking and short-cut nitrification-denitrification processes is realized, and efficient removal of total nitrogen in the aged landfill leachate and reduction treatment of excess sludge are realized.

The invention relates to the technical field of biological sewage treatment, in particular to an autotrophic flora coupling denitrification method by taking desulfurization waste liquid in the coking industry as electron donors, which comprises the following steps: taking thiocyanate and thiosulfate in the desulfurization waste liquid in the coking industry as the electron donors; efficient removal of nitrate nitrogen in the wastewater is achieved through the coupling effect of the sulfur autotrophic denitrification process and the anaerobic ammonia oxidation process, and meanwhile resource utilization of the desulfurization waste liquid is achieved. In the sulfur autotrophic denitrification process, reducing state sulfur is used as an electron donor to reduce nitrate nitrogen into nitrogen and nitrite nitrogen, meanwhile, thiocyanate is converted into ammonia nitrogen and sulfate, and thiosulfate is converted into sulfate; ammonia nitrogen and nitrite nitrogen are converted into nitrogen in the anaerobic ammonia oxidation process, and a small amount of generated nitrate nitrogen can be continuously used as a substrate in the sulfur autotrophic denitrification process. The method does not need additional organic carbon sources, is low in operation cost, low in sludge yield and environment-friendly, realizes treatment of wastes with wastes, and has economic benefits and environmental protection values.

The utility model particularly relates to a short-cut nitrification-anaerobic ammonia oxidation integrated reactor. The reactor comprises a short-cut nitrification area, a sponge iron area, an anaerobic ammonia oxidation area and an autotrophic denitrification area. According to the growth characteristics of different bacteria, environment control is performed in a targeted manner, so that the different bacteria are in respective optimal growth conditions, the activity of the bacteria is ensured, and the system is more efficient. In addition, nitrite nitrogen in the reactor is consumed while being generated, the concentration of the nitrite nitrogen in the system is low, and the problem of inhibition of high nitrite nitrogen concentration on anaerobic ammonium oxidation bacteria is solved. According to the reactor, the short-cut nitrification reaction and the anaerobic ammonia oxidation reaction are arranged in the same system, the anaerobic ammonia oxidation reaction can supplement needed alkalinity for the short-cut nitrification reaction, consumption of extra chemical agents is reduced, cost is saved, and the reactor has high practical value.

A method for producing ammonium nitrate includes a nitrogen dioxide recovery step of bringing nitrogen dioxide in a cement exhaust gas into contact with water to obtain an NOx-containing solution, a reduction reaction step of producing ammonia by bringing a reducing catalyst into contact with the NOx-containing solution, an ammonia recovery step of vaporizing the ammonia with a waste heat gas, a solid-liquid separation step of separating a residue after the ammonia recovery into iron hydroxide and an unused residue of NOx, a neutralization step of bringing the separated nitrate / nitrite nitrogen-containing solution and the NOx-containing solution into contact with the ammonia vaporized and recovered to prepare ammonium nitrate, and a catalyst production step in which magnetite used in the reduction reaction step is obtained by reacting iron sulfate with a sodium hydroxide aqueous solution and separating the mixture into solid and liquid, the sodium sulfate aqueous solution in the solid-liquid separation is separated into sodium hydroxide and sulfuric acid by electrodialysis, and the sodium hydroxide is used in a circulatory manner for preparing the magnetite, where the nitrogen dioxide in the cement exhaust gas is treated simply and efficiently while reducing environmental burden.

The utility model relates to a kind of electric field activation pyrite removal wastewater total nitrogen device, belong to sewage treatment technical field, the utility model includes water distribution tank, reaction tank and effluent tank;Anode cage, cathode tube are equipped in the reaction tank, and sulphur iron ore particles are filled between cathode tube and anode cage;The power supply is connected to the cathode tube and anode cage;Water distribution tank and reaction tank between being equipped with baffle A, and the bottom of baffle A remains water flow passage A;Reaction tank and effluent tank between being equipped with baffle B;Water flow passage B is left in the left side of baffle B;The structure of the utility model makes sewage contact with sulphur iron ore under the action of electric field, and nitrate nitrogen and nitrite nitrogen can be reduced to nitrogen without biological bacteria, and nitrogen removal rate is high.

The invention discloses a method for treating antibiotic-containing aquaculture tail water by utilizing bacteria-algae granular sludge. The method comprises the following steps: (1) domesticating the bacteria-algae granular sludge; (2) an antibiotic-free exposure test stage; (3) a low-concentration antibiotic exposure experiment stage; (4) a high-concentration antibiotic exposure experiment stage; and (5) an antibiotic exposure recovery experiment stage. According to the method, a symbiotic system is formed by inoculating scenedesmus and aerobic granular sludge, oxygen is supplied by utilizing photosynthesis of algae, a carbon source is produced by metabolism of bacteria, low-energy-consumption operation is realized, an antibiotic degradation path is strengthened, and synchronous removal of nitrite nitrogen and antibiotics is promoted by combining a reflux device. The problems that the concentration of nutrient substances in traditional aquaculture tail water is low, antibiotic residues inhibit microbial activity, the concentration of nitrite nitrogen in effluent is high, and the antibiotic removal efficiency is low are solved, and the method is suitable for efficient treatment of the antibiotic-containing aquaculture tail water.

The invention relates to the technical field of sewage treatment, and particularly discloses an improved continuous flow AO device with a sequencing batch regulation mechanism, and a flow regulation unit is configured between a raw water inlet bucket and an anoxic reaction tank; an adjusting device is arranged between the anoxic reaction tank and the aerobic reaction tank; a filler is arranged in the anoxic reaction tank; the aerobic reaction tank is provided with an aeration device; a sludge return loop is arranged between the secondary sedimentation tank and the anoxic reaction tank; a nitrification liquid backflow loop is arranged between the aerobic reaction tank and the anoxic reaction tank; according to the device, sequencing batch operation is utilized, and a large number of anoxic zones are formed in the aerobic reaction tank to create conditions for synchronous nitrification and denitrification; meanwhile, in a nitrate nitrogen and ammonia nitrogen coexistence environment in the anoxic reaction tank, sequencing batch operation strengthens the operation efficiency of the system, and shorter anoxic reaction time promotes nitrate nitrogen to be reduced into nitrite nitrogen; the filler is combined to provide a carrier for the growth of anaerobic ammonium oxidation bacteria, so that the enrichment of the anaerobic ammonium oxidation bacteria is realized, and the denitrification contribution of short-cut denitrification coupled anaerobic ammonium oxidation is promoted.