195 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 invention discloses a virulence factor gene relative abundance prediction model based on water quality physicochemical indexes, and relates to the technical field of ecological environment protection, and the virulence factor gene relative abundance prediction model comprises the following steps: taking a plurality of river water samples, obtaining virulence factor gene relative abundance of the river water samples, and obtaining water quality physicochemical index data of the river water samples; temperature, redox potential, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, total nitrogen, total dissolved solids, pH, conductivity, chlorophyll-a, chemical oxygen demand, dissolved oxygen, total organic carbon, total phosphorus, organic nitrogen, phosphate, carbon-nitrogen ratio and organic nitrogen / total nitrogen are taken as explanatory variables, and relative abundance of virulence factor genes is taken as a target variable. And establishing a regression model by adopting a GBM algorithm in an h2o packet in R software, and predicting the relative abundance of the virulence factor gene of the river water sample to be detected by utilizing the prediction model. The research provides a brand new method for predicting the relative abundance of the virulence factor gene and analyzing the environmental response of the virulence factor gene, and the method is suitable for identification and interpretation of a high-dimensional nonlinear ecosystem with complex interaction.

The present invention discloses a strain of Stutzerimonas kunmingensis and its application in water denitrification, relating to the field of biotechnology. The Stutzerimonas kunmingensis was deposited in the General Microbiology Center (CGMCC) of the China Culture Collection of Microorganisms on April 24, 2024, with a deposit address of No. 3, Yard No. 1, Beichen West Road, Chaoyang District, Beijing, and a deposit number of CGMCCNO.30427. The present invention isolated and obtained Stutzerimonas kunmingensis 9‑4 from a water sample of a crucian carp recirculating aquaculture system. The strain has a good removal effect on nitrate nitrogen, nitrite nitrogen and ammonia nitrogen in the water environment. At the same time, adding hematite under light conditions can significantly improve the removal rate of nitrate nitrogen, nitrite nitrogen and ammonia nitrogen by the Stutzerimonas kunmingensis, which can be applied to the removal of nitrate nitrogen, nitrite nitrogen and ammonia nitrogen in aquaculture water environment and aquaculture tail water.

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 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 relates to the field of fish and vegetable comprehensive cultivation, in particular to a photovoltaic fish and vegetable symbiotic system which comprises a photovoltaic system, a fishery breeding system and a circulating purification system, a fishpond is arranged below a photovoltaic panel, net cages are arranged in the fishpond for fish breeding, the circulating purification system is arranged around the fishpond, and water is pumped in the fishpond through a pump station; water quality purification and water quality maintenance are carried out on the pumped water through a precipitation filtration system, a microfilter, a hydroponic vegetable system and an ultraviolet disinfection system in sequence, so that the water body in the pond is ensured to fully and circularly flow, and the concentration of chemical substances such as ammonia nitrogen, nitrite nitrogen and the like which are harmful to fishes is reduced. Through the synergistic effect of all parts of the photovoltaic fish and vegetable symbiotic system, the problem that the water quality in the aquaculture environment under the photovoltaic panel is prone to deterioration is effectively solved, and the aquaculture benefits are improved.

The invention discloses a water quality parameter measurement method driven by a multilayer deep learning model, which realizes high-precision measurement of key water quality parameters such as COD (Chemical Oxygen Demand), total nitrogen (TN), total phosphorus (TP), nitrate nitrogen (NO3-N), nitrite nitrogen (NO3-N), ammonia nitrogen (NH3-N), turbidity and chromaticity by fusing CNN (convolutional kernel 3 * 1 and kernel number 32 / 64), BiLSTM (hidden nodes 30-60) and Attention mechanism and combining WOA hyper-parameter optimization (learning rate 0.001-0.01). According to the method, Savitzky-Golay filtering (window 11, order 3) denoising is adopted, data quality is enhanced through normalization preprocessing, model robustness is improved through 10-fold cross validation and an Adam optimizer, the problem that a traditional model is poor in adaptability to complex spectrum time sequence data is solved, and the method is suitable for rapid online monitoring of water quality.

The invention discloses a macrobrachium rosenbergii probiotic biofloc technology (BFT) culture system construction method based on an SBOS-FOS composite carbon source, and belongs to the technical field of aquaculture. The total ratio of SBOS (soybean oligosaccharide) and FOS (fructo-oligosaccharide) in the composite carbon source is 2%-10%, and the balance is glucose; and adding the composite carbon source into a macrobrachium rosenbergii culture system according to the C / N ratio of (10: 1)-(20: 1) according to the feed protein content in the culture water body. Through a specific ratio of SBOS to FOS, the content of functional probiotics in a culture water body is specifically increased, stable control of ammonia nitrogen and nitrite nitrogen and directional optimization of a carbon source-flora-host three-level regulation and control network in a BFT system are realized, the weight gain rate (WG), the specific growth rate (SGR) and digestive enzyme activity (trypsin and amylase) of macrobrachium rosenbergii are increased, and the survival rate of the macrobrachium rosenbergii is increased. The abundance of probiotics in the water body and the immune gene expression of the macrobrachium rosenbergii are obviously improved.

The invention provides a bacterial strain YB070 (Acinetobacter indicus YB070), and the bacterial strain is separated from activated sludge of a nitrogen-containing wastewater treatment system. The YB070 strain can grow under anaerobic, aerobic and anoxic conditions, the growth under the aerobic condition is the best, and the growth under the anoxic condition is the second. The strain can grow well in a pH range of 5-9, and is preferred to an acidic environment. And when the NaCl concentration is greater than 7%, the growth is inhibited. YB070 can tolerate high-concentration ammonia nitrogen and can effectively remove ammonia nitrogen under the aerobic condition, and the removal rate of 367mg / L ammonia nitrogen can reach 34.1%. Nitrate nitrogen and nitrite nitrogen in a water body can be removed under the aerobic condition and the anaerobic condition. The removal rates of nitrate nitrogen and nitrite nitrogen respectively reach 92% and 100%. The strain has a good application prospect in sewage denitrification.

The invention provides an efficient resourceful treatment method for industrial wastewater, and belongs to the technical field of wastewater treatment. The method comprises the following steps: adjusting the pH value of wastewater to be treated to 6.8-7.4, adding a composite reducing agent, reacting to obtain a reaction solution, and filtering and separating the reaction solution to obtain a nitrogen-containing filtrate and filter residues; mixing the nitrogen-containing filtrate, magnesium hydroxide and phosphoric acid, adjusting the pH value to 8.5-9.2, reacting, and centrifuging to obtain a supernatant and a solid matter; and performing post-treatment on the supernate to obtain effluent, and drying the solid matter to obtain the nitrogen fertilizer. According to the method, nitrate nitrogen and nitrite nitrogen in the wastewater are reduced into ammoniacal nitrogen through the composite reducing agent, and then the ammoniacal nitrogen is solidified and crystallized through the nitrogen fixing agent. According to the method, inorganic nitrogen in wastewater is used as a raw material, conversion from nitrate nitrogen to ammoniacal nitrogen is completed by means of a composite reducing agent, efficient fixation of ammoniacal nitrogen is achieved, the situation that nitrogen escapes in the form of nitrogen is avoided, the nitrogen is converted into solid nitrogen fertilizer, and available resources are provided for downstream related enterprises.

The invention relates to the technical field of water treatment, in particular to a short-cut nitrification process which comprises a water inlet area, a short-cut nitrification area and the like, nitrate nitrogen is refluxed by a circulating pump and sprayed to a filler layer through a water distribution pipe to realize denitrification, flora mass transfer and biological membrane updating are promoted by combining mechanical shear force, and a DO gradient is formed through aeration to realize coupling of synchronous nitrification and short-cut nitrification. And ammonia nitrogen and nitrite nitrogen directly generate nitrogen. According to the process, the denitrification efficiency can be improved to 95% or above, the aeration energy consumption is reduced by 40-50%, the sludge yield is reduced by 30% or above, and the process is low in equipment investment, high in adaptability and suitable for high-ammonia-nitrogen industrial wastewater treatment.

This invention discloses a heterotrophic-aerobic denitrifying bacterium C-3 and its applications. The heterotrophic-aerobic denitrifying bacterium C-3 is deposited at the China General Microbiological Culture Collection Center (CGMCC), classified as *Brevundimonas naejangsanensis*, with accession number CGMCC No. 31729, and deposited on August 23, 2024. The heterotrophic-aerobic denitrifying vesicular *Brevundimonas naejangsanensis* strain C-3 provided by this invention exhibits excellent nitrate nitrogen removal efficiency (100%) under aerobic conditions using sodium acetate as a carbon source, a C / N mass ratio of 10, a pH of 7, a temperature of 30℃, and a rotation speed of 200 r / min. In actual aquaculture wastewater, it demonstrates excellent removal effects on nitrate nitrogen, nitrite nitrogen, ammonia nitrogen, and total nitrogen. Furthermore, this strain exhibits high safety and has significant application value in treating aquaculture wastewater.

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 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.

The invention discloses a rapid nitrite nitrogen enrichment method based on flow regime optimization, a wastewater low-carbon denitrification system and application, according to the method, a microenvironment suitable for AOB growth and nitrite nitrogen accumulation is accurately induced to be formed in a reactor through hydrodynamic regulation and control of an MBBR, so that treated water contains rich nitrite nitrogen, and the content of nitrogen in the wastewater is increased. And the water outlet is further connected with a denitrification biological nitrogen removal process or an anaerobic ammonia oxidation biological nitrogen removal process to form a wastewater low-carbon nitrogen removal system. The coupling system realizes a complete denitrification path under the condition of no additional or low carbon source, is suitable for the treatment requirements of urban sewage and industrial wastewater with low C / N ratio, and has the remarkable engineering advantages of low energy consumption, low carbon source requirement, high operation stability and the like.

The invention discloses Pseudomonas hunanensis N6-2 and application thereof, and belongs to the technical field of environmental microorganisms, the Pseudomonas hunanensis N6-2 is separated from the wetland of the Yellow River Delta, can grow by taking ammonia nitrogen, nitrate nitrogen and nitrite nitrogen as a unique or mixed nitrogen source, and has the functions of heterotrophic nitrification and aerobic denitrification at the same time. The strain has very high treatment efficiency on sewage with the nitrogen concentration of 500 mg / L or below, can tolerate high-salt-alkali sewage with the salinity of 50 g / L and the pH value of 10, has wide environmental adaptability, is non-toxic and harmless in the treatment process and eco-friendly, and has great application potential.

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 utility model relates to the technical field of aquaculture, in particular to self-cleaning recirculating aquaculture equipment which comprises a fish barrel pool, a first water pump, a first water pipe, a second water pipe, a treatment frame, a hydroxyl radical area, an anaerobic area, an aerobic area and the like. A first water pump is mounted on one side of the fish barrel pool, a first water pipe is connected to the water pumping end of the first water pump and connected with the fish barrel pool, a second water pipe is connected to the water drainage end of the first water pump, and a treatment frame is connected to the side, away from the first water pump, of the second water pipe and divided into a hydroxyl free radical area, an anaerobic area and an aerobic area. According to the utility model, the hydroxyl radical zone, the anaerobic zone and the aerobic zone are arranged, sewage in the fish bucket pool is cleaned, denitrified and oxygenated through the anaerobic zone and the aerobic zone, harmful pollutants such as ammonia nitrogen and nitrite nitrogen are removed, and then clean water is re-injected into the fish bucket pool through the third water pump, so that self-cleaning water circulation is realized; and a stable, reliable, comfortable and high-quality growth environment is provided for cultured organisms.

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.

The invention discloses a marine shipping marinobacter SND-2 strain as well as a culture method and application of the marine shipping marinobacter SND-2 strain. According to the invention, a heterotrophic synchronous nitrification and denitrification functional strain SND-2 capable of efficiently degrading nitrogen concentration in a marine culture water body under an aerobic condition is separated from a prawn culture pond, and the strain is identified as Marinobacter nauticus according to colonial morphology and 16S rDNA gene sequencing analysis and phylogenetic analysis, the marine marinobacter SND-2 strain is preserved in the China Center for Type Culture Collection on October 15, 2024 (the preservation number is CCTCC NO: M 20242217). The marine marinobacter SND-2 strain belongs to heterotrophic ammonia oxidizing bacteria, has a heterotrophic nitrification-aerobic denitrification function, can efficiently degrade ammonia nitrogen, nitrite nitrogen, nitrate nitrogen and total nitrogen concentration in a marine culture water body under an aerobic condition, has no toxic effect on aquatic animals, and can be applied to ecological restoration of a seawater water environment.

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 application discloses application of functional bio-floc in prawn culture. Bacillus subtilis XYB4 and neutral protease are added into traditional bio-floc to prepare the functional bio-floc. The functional bio-floc is applied to prawn culture, which not only purifies the culture water quality and effectively reduces the content of ammonia nitrogen and nitrite nitrogen in the culture water, thereby reducing the toxicity of ammonia nitrogen and nitrite nitrogen to prawns, but also improves the growth performance and antioxidant enzyme activity of prawns, so that the green, environmentally-friendly, safe and efficient ecological prawn culture is realized.

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.