757 results about "Nitrite salt" patented technology

The invention belongs to the technical field of wastewater denitrification treatment, and particularly relates to an anaerobic ammonia oxidation reaction-based integrated partitioned denitrification method which comprises the following steps: S1, removing high-concentration organic matters and suspended matters in wastewater through coagulating sedimentation or chemical oxidation pretreatment to avoid inhibition on subsequent Anammox; s2, partitioning the integrated reactor, and setting a short-cut nitrification region and an Anammox reaction region; s3, enabling the effluent part of the Anammox reaction zone to flow back to the short-cut nitrification zone, supplementing nitrite and balancing the carbon nitrogen ratio; the Anammox granular sludge flows back to the reaction zone through the settling zone, and the biomass concentration and the reaction efficiency are maintained; s4, a secondary sedimentation tank or a built-in sedimentation zone is arranged to achieve mud-water separation, residual sludge is discharged, and it is guaranteed that effluent reaches the standard, and it is guaranteed that the denitrification efficiency is stable by dynamically adjusting dissolved oxygen of the short-cut nitrification zone and the pH value of the Anammox reaction zone.

The invention discloses a high-activity short-cut nitrification quick-start long-term stable operation process, which relates to the technical field of biological sewage treatment, and comprises the following steps: inoculating sludge, carrying out anaerobic fermentation pretreatment, and removing expanded sludge and sludge foam in combination with quick sludge discharge and manual removal; controlling the number of days of sludge age, reproliferating the sludge, enriching ammonia oxidizing bacteria, and inhibiting and elutriating nitrite oxidizing bacteria; long-term operation is carried out under the condition of no sludge discharge, the abundance and activity of ammonia oxidizing bacteria are maintained, and meanwhile, the abundance of nitrite oxidizing bacteria is controlled; the proliferation of nitrite oxidizing bacteria is controlled by using the predation effect of protozoa and metazoan, and the accumulation rate of nitrite in the reactor is controlled; monitoring the dissolved oxygen, the pH value and the concentrations of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the reactor in real time, and regulating and controlling the influent ammonia nitrogen load and the free ammonia concentration; dissolved oxygen distribution is adjusted in an intermittent aeration or microporous aeration mode, and the operation conditions of the short-cut nitrification reactor are optimized. The method is simple to operate, economical and effective.

The invention relates to the technical field of microorganisms, in particular to lactobacillus pentosus JX3 and application of the lactobacillus pentosus JX3. The invention provides lactobacillus pentosus JX3 which is high in acid resistance and salt resistance, capable of efficiently degrading nitrite, resistant to oxidation, high in antibacterial capacity and capable of producing acid and amino acid nitrogen. When the lactobacillus pentosus JX3 with good fermentation performance is applied to fermentation, the content of substances such as total acid and amino acid nitrogen can be increased, the oxidation resistance can be improved, the content of ester and alcohol volatile substances with fresh and fruity flavor in a fermented product can be increased, and the product quality can be improved. The edible safety is improved, the shelf life is prolonged, the nutritional value is improved, and the flavor is improved.

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 compound yeast agent for anaerobic degradation of biodegradable plastics. The compound yeast agent comprises the following components in percentage by mass: 0.5-3% of fenpropathrin, 1-6% of nitrite, 1-4% of ammonium molybdate, 5-10% of PLA, 5-10% of nano starch, 3-6% of nano calcium carbonate, 1-5% of carbamide and the balance of a biodegradable resin carrier. The production method comprises the following steps: 1, dispersion treatment; 2, centralization processing; 3, carrying out structured treatment; 4, carrying out carrier implantation treatment; and 5, plasticizing and granulating. The compound yeast agent is added into the plastic, and the addition amount is 1-5%, so that the anaerobic degradation plastic is formed. According to the invention, anaerobic degradation can be regulated and controlled, and more importantly, anaerobic degradation also realizes that the degradable plastic disclosed by the invention is in a normal use condition, the plastic cannot be degraded quickly in light and oxygen environments, the aging property of the plastic is equivalent to that of a resin matrix of the plastic, and the physical and mechanical properties are ensured.

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 relates to a preparation method and application of polysaccharide-based fluorescent carbon quantum dots with adjustable emission wavelength, and belongs to the technical field of preparation of fluorescent carbon nanomaterials. Polysaccharide is respectively mixed with different nitrogen dopants o-phenylenediamine, m-phenylenediamine and p-phenylenediamine, then the mixture is subjected to a hydrothermal reaction to respectively prepare blue, green and yellow green fluorescent carbon quantum dots, and then the blue, green and yellow green fluorescent carbon quantum dots are applied to nitrite detection. The carbon quantum dots with different emission wavelengths and different colors are obtained by adjusting the types of the nitrogen doping agents, the problems that the emission wavelengths of the carbon quantum dots cannot be adjusted and the range is narrow are solved, and reference is provided for subsequent design and opening of the generator-based multicolor fluorescent carbon quantum dots. Meanwhile, the biological polysaccharide is used as a raw material, deionized water is used as a solvent, the whole technological process is easy to operate and low in cost, and the method has far-reaching significance on further high-value utilization of biomass resources and promotion of sustainable utilization of the biomass resources.

The invention discloses a water quality monitoring method and monitoring system for a blue crab culture system, and relates to the field of aquaculture. Comprising the following steps that the dissolved oxygen concentration is calculated through light source irradiation and light intensity data collected by an optical sensor, and a result is corrected according to water temperature and pressure. Further obtaining the content of chemical parameters such as ammonia nitrogen and nitrite, and calculating the chemical index of water quality. Meanwhile, on the basis of the light intensity, the refractive index of suspended particles and the average diameter, the mixing degree is represented, the conductivity is detected, and the ecosystem health index is generated. A water quality comprehensive evaluation coefficient is obtained through comprehensive analysis and compared with a water quality evaluation threshold value, different water quality evaluation instructions are generated, the water quality condition of the aquaculture water source is comprehensively evaluated, and the aquaculture environment health is ensured. The automation and intelligence level of aquaculture water monitoring is improved, risks in the aquaculture process can be reduced, and the growth speed and quality of aquaculture objects such as blue crabs are improved.

The invention relates to the technical field of sewage treatment, in particular to an internal and external backflow automatic control system for sewage treatment. The system comprises an internal reflux system and an external reflux system, and the internal reflux system adjusts the frequency of internal reflux pumps or the number of started internal reflux pumps by monitoring the change of water quality parameters such as nitrate nitrogen, nitrite nitrogen, ammonia nitrogen and dissolved oxygen so as to maintain the balance of nitrification and denitrification reactions; and the external reflux system adjusts the flow of an external reflux pump by monitoring the sludge concentration and the sludge level height so as to maintain the concentration and activity of microorganisms in the biological reaction tank. Besides, the system also adopts a mathematical model, a feedforward control strategy and a feedback control module, so that the response speed and the stability of the system are improved, the effective treatment of sewage is ensured, and the overall treatment efficiency and the effluent quality are improved.

The invention relates to a preparation method of a multi-site silver (Ag) and nickel hydroxide (Ni (OH) 2) modified copper (Cu) nanowire catalyst (Ag-Ni (OH) 2) / Cu NW) and application of the multi-site silver (Ag) and nickel hydroxide (Ni (OH) 2) modified copper (Cu) nanowire catalyst. A cation exchange and electrodeposition method is adopted to prepare an electrocatalytic nitrate reduction reaction NO3-RR series catalyst with three sites of Ag, Ni (OH) 2 and Cu. Based on the synergistic effect of three sites, Ag in the catalyst promotes conversion from nitrate NO3 <-> to nitrite NO2 <->, Ni (OH) 2 promotes dissociation of water H2O to generate free hydrogen * H, Cu atoms near Ni (OH) 2 accelerate conversion from NO2 <-> to ammonia NH3, and the efficient series catalytic process is achieved. Under the condition of-0.1 V vs. Reversible hydrogen electrode RHE in a 1M potassium hydroxide solution containing 50 mM of potassium nitrate, the NH3 yield of 4.01 mgh <-1 > cm <-2 > and the NH3 Faraday efficiency of 97.3% are obtained, under the condition of 0V vs. RHE, the excellent energy efficiency of 46.5% is achieved, the excellent catalytic activity is kept in a NO3 <-> solution with the wide concentration, and the good sewage treatment capacity is achieved. The invention provides a new design thought for tandem catalysis, and has a wide application prospect in the field of NO3-RR.

The invention relates to the technical field of aquaculture, in particular to an aquaculture water environment repairing agent and a preparation method thereof, and the repairing agent is composed of a modified biochar composite material, chlorella microspheres, a cross-linking agent and a microbial compound inoculant. The modified biochar composite material is prepared through the steps of mixing attapulgite and biomass raw materials, performing acid activation, performing pyrolysis and the like, and tannic acid is used for further modification so as to enhance the adsorption capacity; the chlorella microspheres are prepared from sodium alginate and a CaCl2 solution, and have good suspension property and stability; the microbial complex microbial inoculant contains various beneficial bacteria, and can decompose organic matters and reduce the content of ammonia nitrogen and nitrite; the components of the repairing agent are combined through the cross-linking agent to form particles, so that the repairing agent is convenient to put and recycle. The repairing agent disclosed by the invention has efficient pollutant removal capacity, and can be used for remarkably improving the water quality of aquatic water, improving the transparency of the water, increasing dissolved oxygen and promoting the health and stability of an aquatic ecosystem.

The invention discloses a multifunctional monitoring device for fishpond culture, and relates to the technical field of fishpond culture. The device comprises a monitoring outer cylinder, the monitoring outer cylinder is arranged on a floating plate, a monitoring inner cylinder is arranged in the monitoring outer cylinder, a layering mechanism is arranged in the monitoring inner cylinder, the layering mechanism comprises a threaded rod arranged in the monitoring inner cylinder, the threaded rod is in threaded connection with the monitoring inner cylinder, and a plurality of layering plates are arranged in the monitoring inner cylinder. The monitoring inner cylinder is uniformly divided into a plurality of layered bins by the plurality of layered plates, and monitoring equipment sensors for data such as temperature, dissolved oxygen and PH value are arranged in the layered bins. By rotating a threaded rod, a monitoring inner cylinder slides and ascends along the interior of a monitoring outer cylinder, so that a water inlet groove and a filter screen coincide, and then pond water can enter a layering bin; and finally carrying out temperature detection on environmental factors such as water temperature, pH value, dissolved oxygen, ammonia nitrogen, nitrite and the like of pond water at different depths through a monitoring equipment sensor.

The disclosure relates to a method of producing a multi-metal catalyst film and of producing a reactor system for catalytic removal of a wide variety of contaminants (for example, nitrate, nitrite, perchlorate, chlorate, chromate, selenate, chlorophenols, 2,4-D, dicamba, atrazine, trichloroacetic acid, bromochloroiodomethane, NDMA, TCE, TCA, chloroform, freons, RDX, HMX, TNT, PFOA, and PFOS) from water and wastewater. The disclosure also relates to a method of using the multi-metal catalyst for the removal of such contaminants and a system comprising the multi-metal catalyst film for removing such contaminants.

Systems and methods for producing ammonium nitrate are disclosed herein. Exemplary systems can comprise a bioreactor positioned to receive a feed including ammonia. The bioreactor can hold a liquid solution including (i) an ammonia oxidizing bacteria (AOB) and (ii) a nitrite oxidizing bacteria (NOB). The AOB can facilitate oxidation of the ammonia to produce a nitrite at a nitritation rate and the NOB can facilitate oxidation of the nitrite at a nitratation rate. Thus, the bioreactor can produce a mixed liquor comprising a nitrate biologically. The system can further comprise a filter positioned to receive the mixed liquor and produce a permeate and a sludge. A sensor can measure the concentration of the liquid solution of the bioreactor, and a controller coupled to the sensor can regulate the mass flow of nitrogen and / or phosphorus of the bioreactor feed based on the measured concentration of the liquid solution.

The invention belongs to the field of industrial wastewater treatment, and relates to an iron autotrophic denitrification coupling anaerobic ammonia oxidation combined enrichment culture device and method. Comprising a water inlet tank, a No.1 anoxic reactor, an intermediate tank and a No.2 anaerobic reactor, the water inlet tank is provided with a water outlet pipeline of the water inlet tank, and the water outlet pipeline of the water inlet tank is connected with the No.1 anoxic reactor; the anoxic reactor I is provided with a water outlet pipeline of the anoxic reactor I, and the water outlet pipeline of the anoxic reactor I is connected with the intermediate tank; the intermediate tank is provided with an intermediate tank water outlet pipeline, and the intermediate tank water outlet pipeline is connected with the No.2 anaerobic reactor; the No.2 anaerobic reactor is provided with a No.2 anaerobic reactor water outlet pipeline; the No.2 anaerobic reactor water outlet pipeline is connected with the No.1 anoxic reactor. According to the invention, collaborative culture of autotrophic denitrification bacteria and anaerobic ammonium oxidation bacteria can be realized, an autotrophic denitrification effect provides a certain amount of nitrite and iron ions to promote anaerobic ammonium oxidation reaction, and an anaerobic ammonium oxidation effect can effectively prevent an autotrophic denitrification tank body from being mineralized.

The invention discloses an electrode material for electrocatalytic degradation of organic wastewater containing high-concentration nitrate and application of the electrode material, a copper salt precursor solution and a tin salt precursor solution are sequentially attached to the surface of a Ti plate, so that a Ti / Cu-Sn multi-metal coating electrode material is obtained, the Ti / Cu-Sn multi-metal coating electrode material is used as a cathode, a metal electrode is used as an anode to construct an electrolytic tank, and the high-concentration nitrate-containing organic wastewater is obtained. The catalyst is used for simultaneous degradation of NO3 <-> and COD in organic wastewater containing high-concentration nitrate and co-production of hydrogen. The electrode material is simple in preparation process, low in cost and high in catalytic activity and stability, nitrate and organic matter in wastewater can be safely, mildly and simultaneously removed in the electrolysis process of the electrode material, and secondary pollution byproducts such as ammonia nitrogen and nitrite are hardly generated. Tests show that the removal rate of nitrate radicals can reach 99.72%, the removal rate of COD (Chemical Oxygen Demand) can reach 84.61% and the selectivity of nitrogen can reach 99.83% when the method is used for treatment.

The invention relates to a nitride concentration quantitative analysis method based on a relative position matrix method and a Raman spectrum, and belongs to the field of Raman spectrum quantitative analysis. The method comprises the following steps: collecting Raman spectrum data of a sample through a Raman spectrometer, and establishing a Raman spectrum data set; carrying out smoothing and baseline deduction on the Raman spectrum data set, and carrying out data enhancement and data normalization on the data set; performing two-dimensional conversion on the preprocessed data set by using a relative position matrix method; training a multi-modal fusion neural network model based on the original one-dimensional spectral data and the converted two-dimensional image data; and quantitatively detecting the concentrations of nitrate and nitrite in water by using the trained model. The Raman spectrum and the relative position matrix method are combined, quantitative detection of the nitride concentration in the water sample is achieved, and technical support is provided for large-scale application of the Raman spectrum in actual water sample detection.

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.

A pharmaceutical composition comprising sitagliptin or a pharmaceutically acceptable salt thereof, wherein the composition comprises less than 5 ppm of 7-Nitroso-3-(trifluoromethyl)- 5,6,7,8-tetrahydr

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 copper-modified wheel-type tungsten phosphate, a preparation method of the copper-modified wheel-type tungsten phosphate and application of the copper-modified wheel-type tungsten phosphate in production of ammonia through electro-catalysis of nitrite reduction, and provides the copper-modified wheel-type tungsten phosphate, the preparation method of the copper-modified wheel-type tungsten phosphate and application of the copper-modified wheel-type tungsten phosphate in production of ammonia through electro-catalysis of nitrite reduction. According to the invention, the transition metal copper is introduced on the basis of K28Li5 [H7P8W48O184] 92H2O (hereinafter referred to as P8W48). K12Li13 [Cu20Cl (OH) 24 (H2O) 12 (P8W48O184)]. 22H2O (hereinafter referred to as Cu20P8W48) is formed through self-assembling and positioning, and the K12Li13 [Cu20Cl (OH) 24 (H2O) 12 (P8W48O184)]. 22H2O is applied to reduction of nitrite through electro-catalysis to prepare ammonia.

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 invention provides a pseudomonas stutzeri (Stutzeria stutzeri) C1-1 and an application of the pseudomonas stutzeri (Stutzeria stutzeri) C1-1. The preservation number of the pseudomonas stutzeri is CGMCC (China General Microbiological Culture Collection Center) NO.32082, the pseudomonas stutzeri is preserved in the China General Microbiological Culture Collection Center, the preservation date is September 26th, and the preservation address is No.3, Yard 1, Beichen West Road, Chaoyang District, Beijing. The embodiment of the invention also provides an application of the Stutzeria stutzeri (Stutzeria stutzeri) C1-1 in short-cut denitrification of the sewage. According to the present invention, the existing nitrogen source and the existing carbon source in the sewage can be utilized to convert NO3 <->-N into NO2 <->-N, the good NO2 <->-N accumulation effect is provided, and the nitrite converted from the nitrate can be stably accumulated during the reaction process.

The invention provides a self-circulation water quality purification system which comprises a culture space body and a self-circulation purification system, the self-circulation purification system comprises a hollow flow guide box, a water pump, an anti-blocking cotton layer and a control device, the water pump is arranged in the flow guide box, and the flow guide box is arranged at the bottom of an inner cavity of a fish tank body; a water seepage guide plate is formed at the top of the guide box; the anti-blocking cotton layer is arranged on the upper surface of the water seepage guide plate; a fungus bed layer is laid on the upper surface of the anti-blocking cotton layer; a plurality of leaking holes are formed in the surface of the water seepage guide plate; a plurality of clapboards are arranged between the lower surface of the seepage guide plate and the bottom of the inner cavity of the guide box; one side of each partition plate in the width direction is connected with one inner side wall of the diversion box, and a gap is formed between the other side of each partition plate in the width direction and the inner side wall of the diversion box. And the microbial flora can obtain the maximum digestion nutrition due to the comprehensive and stable water flow, so that harmful substances such as ammonia, nitrogen, nitrate and nitrite in water are eliminated, meanwhile, hydrogen sulfide is avoided, and a good water purification function can be maintained.

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 belongs to the technical field of urban sewage treatment, and particularly discloses a method for promoting short-cut nitrification formation of urban sewage, which is characterized in that a sequencing batch activated sludge reactor (SBR) with different carbon nitrogen ratio gradients is operated, and the initial ammonia nitrogen concentration is 25 mg / L. Based on the principle that the adaptability of ammonia-oxidizing bacteria is stronger than that of nitrite-oxidizing bacteria, the carbon-nitrogen metabolic pathway of denitrifying flora and the mutual competition relationship among the flora are adjusted through different carbon-nitrogen ratio conditions, the biological activity of the nitrite-oxidizing bacteria is inhibited, and the purpose of forming short-cut nitrification by a system with a relatively high carbon-nitrogen ratio is achieved. And the method inhibits nitrite oxidizing bacteria on the community structure, the formed inhibition effect is more stable compared with operation parameter regulation, and a new regulation strategy is provided for low-carbon-nitrogen-ratio urban sewage treatment.

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 discloses a composite early-strength anti-freezing water reducing agent and a preparation method thereof. The composite early-strength anti-freezing water reducing agent comprises the following components: nitrate or nitrite, an alcohol anti-freezing component, alcohol amine, polycarboxylic acid high-performance water reducing agent mother liquor, a polyether air entraining agent and water. The method comprises the following steps: adding water into production equipment, sequentially adding nitrate or nitrite, methanol, ethylene glycol, hydramine and the polycarboxylic acid high-performance water reducing agent mother liquor, uniformly stirring, and discharging to obtain the product. The invention has the following advantages: the dosage form is a water agent, dust pollution is avoided, occupational health and safety of practitioners are protected, the labor cost of feeding is saved, the early-strength anti-freezing component and the water-reducing component are compounded together, and the water-reducing rate and concrete anti-freezing critical strength specified by national standards and industrial standards are reached under the condition that the dosage is determined, so that the dosage is reduced; the product can resist low temperature of-20 DEG C without crystallization, is not layered after being placed for a long time, and has no precipitate.

The invention provides a betahistine hydrochloride pharmaceutical preparation and a preparation method thereof. The betahistine hydrochloride pharmaceutical preparation comprises conjugated linoleic acid, betahistine hydrochloride and auxiliary materials. Conjugated linoleic acid and betahistine hydrochloride are combined together for the first time, and conjugated double bonds of conjugated linoleic acid can be specifically combined with nitrite to block the generation of nitrosamine, so that the content of N-nitrosobetahistine can be remarkably reduced. Based on the chemical characteristics of conjugated linoleic acid, conjugated linoleic acid is used as a functional additive, targeted removal of nitrosamine impurities is achieved, and meanwhile the situation that exogenous toxic substances are introduced to affect the drug effect of betahistine hydrochloride is avoided. In the experiment process, it is also accidentally found that after the conjugated linoleic acid is added, the positive effect on cerebrovascular diseases is also achieved.