819 results about "Nitration" 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 relates to the technical field of microorganisms, and discloses a sewage aquatic microbe with ammoxidation capacity, a microbial agent and application of the microbial agent. The strain name of the sewage aquatic microbe is B1, and the preservation number of the sewage aquatic microbe is CCTCC No: M 2025640. The sewage aquatic microbacterium B1 provided by the invention can convert ammonia nitrogen into nitrite nitrogen, so that short-cut nitrification is realized in wastewater treatment, and the strain can tolerate and effectively treat ammonia nitrogen with relatively high concentration, and has relatively good adaptive capacity to environments with different pH values, salinity and temperatures.

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 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 nitrite concentration monitoring method based on a sensor coupling soft measurement model. The method comprises the following steps: S1, acquiring target influence factor data; determining a plurality of target influence factors based on the water quality parameters and the nitrification process of the to-be-monitored sewage; s2, establishing a soft measurement model; the input of the soft measurement model is the target influence factor, and the output of the soft measurement model is the concentration of nitrite nitrogen; s3, determining the concentration of nitrite nitrogen; according to the method, the target influence factor is firstly acquired by utilizing the sensor, and the nitrite concentration is calculated or predicted in real time by utilizing the target influence factor, so that the problems that monitoring equipment is expensive, the monitoring range is small, the monitoring is inaccurate and the monitoring equipment cannot directly monitor the nitrite in the seriously polluted wastewater in the nitrite monitoring in the prior art can be solved.

The invention belongs to the technical field of sewage treatment, and discloses a two-stage MABR-based efficient denitrification system, method and application, the system comprises an MABR-PN / DN reactor, an MABR-PN / A reactor, a peristaltic pump, an aeration hollow fiber membrane module, a carrier, an aeration pump, a gas flowmeter, a pressure gauge and a liquid flowmeter, and the MABR-PN / DN reactor and the MABR-PN / A reactor are arranged along the vertical direction. According to the system, the series design of the MABR-PN / DN and the MABR-PN / A is utilized, the adverse effect of organic matter in sewage on anaerobic ammonia oxidation treatment of high-concentration ammonia nitrogen wastewater is reduced, nitrate nitrogen generated by the MABR-PN / A flows back to the first-stage MABR-PN / DN to achieve denitrification, the denitrification limitation of a single reactor and a single denitrification path is broken through, and the overall total nitrogen removal rate of the system is higher than 90%.

The invention relates to the technical field of synthesis of a polymerization inhibitor DNBP, in particular to an efficient production method of the polymerization inhibitor DNBP, which comprises the following steps: step 1, material preparation: selecting corresponding raw materials, weighing and classifying the raw materials, and dividing the raw materials into three main materials, auxiliary materials and additives, the auxiliary material comprises a sulfonic acid type ion exchange resin catalyst, the additive is an ethanol-water mixed solvent, and during weighing, weighing and proportioning are performed according to the molar ratio of nitric acid to o-tert-butylphenol being 2.15: 1 and the mass ratio of o-tert-butylphenol to carbon tetrachloride being 0.15: 1; according to the method, a gradient temperature control strategy is adopted, and a multi-stage microchannel reactor is combined, so that efficient mass and heat transfer of nitration reaction is realized, deep nitration side reaction is inhibited, the content of dinitro isomer impurities is greatly reduced, meanwhile, the total residence time can be accurately controlled, the explosion risk caused by local overheating in a traditional process is avoided, and the method is suitable for industrial production. The reaction selectivity and the safety are obviously improved.

The invention belongs to the technical field of high polymer materials, and particularly discloses a halogen-free flame retardant DOPO-NH2 and a preparation method of halogen-free flame-retardant polyamide of the halogen-free flame retardant DOPO-NH2. The halogen-free flame retardant DOPO-NH2 is prepared by taking DOPO and 1, 4-butanediol as raw materials, and carrying out nitration and hydrogenation reduction reaction. The flame retardant DOPO-NH2 is mixed with binary acid and water to prepare a flame retardant organic salt solution, and then the flame retardant organic salt solution is subjected to polymerization reaction with a polyamide salt solution formed by a salt forming reaction of diamine and binary acid to prepare the halogen-free flame-retardant polyamide resin. The halogen-free flame-retardant polyamide prepared by the invention is excellent in flame retardant property, and can obtain a good flame retardant effect under different addition amounts; the limit oxygen index is basically more than 33%, the vertical combustion test reaches the UL94V-0 level, and the flame-free flame retardant is self-extinguished in the combustion test, and no molten drop is generated; the preparation method and process are simple, mild in condition and easy to operate.

The invention relates to a particulate composition comprising, or substantially consisting of, urea, an inhibitor, preferably a urease inhibitor and / or a nitrification inhibitor, and an additive, wherein the additive comprises components (i), (ii), and optionally (iii): (i) one or more polyhydric alcohols; preferably one or more carbohydrates, preferably selected from monosaccharides, disaccharides, and oligosaccharides; (ii) a first polymer, preferably an amine-containing polymer; more preferably a polyvinylamine or a polyalkyleneimine; and (ii) optionally, a second polymer, preferably a polar polymer; more preferably a water-soluble polar polymer. The invention further relates to a process for producing the particulate composition, an additive for a particulate composition, and the use of the particulate composition as a fertilizer.

The invention relates to a process for removing nitrogen monoxide, nitrogen dioxide and nitrous oxide from an exhaust gas stream obtained in a nitration process, comprising: (a) Removing nitrogen monoxide and nitrogen dioxide from the exhaust gas stream by adding an oxygen comprising gas to the exhaust gas stream, oxidizing the nitrogen monoxide in the gas stream to form nitrogen dioxide, thereby obtaining a gas stream depleted in nitrogen monoxide; (b) Washing the gas stream depleted in nitrogen monoxide with water to obtain a gas stream depleted in nitrogen monoxide and nitrogen dioxide; (c) Converting nitrous oxide in the gas stream depleted in nitrogen monoxide and nitrogen dioxide into nitrogen and carbon dioxide and optionally oxygen in the presence of a nitrous oxide reduction catalyst and in the presence of hydrogen cyanide.

The invention provides application of 3-methyl-2-oxazolidinone as a nitrification inhibitor and a nitrification inhibition method, and relates to the technical field of soil treatment. Specifically, the invention relates to application of 3-methyl-2-oxazolidinone as a nitrification inhibitor in soil treatment and / or sewage treatment and inhibition of nitrosation activity of ammonia oxidizing bacteria. The method for inhibiting nitrification comprises the step of treating soil or water containing ammonium nitrogen and ammonia oxidizing bacteria by using 3-methyl-2-oxazolidinone. The concentration of the 3-methyl-2-oxazolidinone is not less than 0.01% w / v by taking the volume of the soil or the water body as 100%. The nitrification inhibition activity of the 3-methyl-2-oxazolidinone is found, so that the variety selection of nitrification inhibitors is enriched.

The invention discloses a composite activated carbon filter material and a preparation process thereof, and belongs to the technical field of water treatment materials. The filter material sequentially comprises a modified coconut shell activated carbon matrix, a bimetallic oxide and a biodegradable functional film from inside to outside, the modified coconut shell activated carbon matrix is prepared by a three-step process of acid leaching modification, microwave activation and nitrogen doping; the bimetallic oxide is Fe-Mn oxide nano particles; the biodegradable functional film is composed of a polyvinyl alcohol / polylactic acid blended film and a complex microbial inoculant, and the complex microbial inoculant comprises a mixed flora of pseudomonas, bacillus and nitrifying bacteria. Through the three-layer composite structure of the coconut shell activated carbon matrix, the bimetallic catalyst layer and the biodegradable film, the synergistic effect of physical adsorption, chemical catalysis and biodegradation is achieved. Through step-by-step superposition of the functional layers, the removal efficiency of complex pollutants such as organic matters, heavy metals, ammonia nitrogen and the like is remarkably improved.

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.

An inhibited aqueous fertilizer composition and methods of use thereof.

The utility model belongs to the technical field of sewage treatment, and relates to a sewage treatment system which comprises a first-stage anoxic tank, a first-stage aerobic tank, a second-stage anoxic tank and a second-stage aerobic tank which are sequentially connected through pipelines, and sludge generated after reaction in the second-stage aerobic tank flows back to the first-stage aerobic tank. Sludge generated after nitrification in a secondary aerobic tank in a wastewater treatment process flows back to a primary aerobic tank for cyclic nitrification, so that the chemical oxygen demand and the total nitrogen load in the sludge are reduced, and the chemical oxygen demand and the total nitrogen in discharged water are reduced; meanwhile, by arranging two-stage anoxic denitrification and two-stage nitration reaction, the nitration and denitrification reaction time is prolonged, the removal rate of ammonia nitrogen and total nitrogen in sewage is increased, the content of ammonia nitrogen and total nitrogen in drained water is reduced, the content of ammonia nitrogen, total nitrogen, chemical oxygen demand and total phosphorus in sewage is further reduced through the synergistic effect, and the emission standard is met.

The present invention belongs to the technical field of sewage treatment. Disclosed is a biological adsorption-partial nitrification-anaerobic ammonium oxidation process based on a functional carrier. The process of the present invention is mainly composed of a biological adsorption section, a partial nitrification section, and an anaerobic ammonium oxidation section, wherein in the biological adsorption section, microorganisms in a logarithmic growth phase are screened and enriched by means of a short hydraulic retention time, and organic matters can be efficiently adsorbed; in the partial nitrification section, a nitrification functional carrier is added to enhance the adsorption of ammonia nitrogen, so as to enrich ammonium oxidation bacteria, and a relatively low level of dissolved oxygen is controlled, so that stable partial nitrification is achieved; and in the anaerobic ammonium oxidation section, an anaerobic ammonium oxidation functional carrier is added, so that the biomass and activity of anaerobic ammonium oxidation bacteria are improved by means of enrichment, and the autotrophic nitrogen removal efficiency is improved. The present invention does not need an additional carbon source, has a small aeration amount and low operating costs, and has great prospects in engineering applications.

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

The invention belongs to the technical field of energetic materials, and discloses a multi-nitro 1-bromine-3-fluoro-5-toluene energetic compound and a preparation method of the multi-nitro 1-bromine-3-fluoro-5-toluene energetic compound. According to the invention, 1-bromine-3-fluoro-5-toluene is taken as a raw material, the multi-nitro 1-bromine-3-fluoro-5-toluene energetic compound is prepared through a direct nitration reaction, the density of the compound is 1.80-2.03 g / cm < 3 >, the melting point is 50-108 DEG C, and the compound has the characteristics of high density, high energy, simple synthesis and the like, and is suitable for energetic plasticizers and casting carrier explosives.

The invention discloses an autotrophic nitrogen removal and detoxification device and method for treating coking wastewater through two-stage low-oxygen short-cut nitrification, sulfur autotrophic denitrification and anaerobic ammonia oxidation, and belongs to the field of sewage treatment. The device comprises a water inlet tank, a sequencing batch reactor, a middle water tank and an up-flow anaerobic sludge blanket reactor. The method comprises the following steps: enabling the coking wastewater which is subjected to carbon capture and contains ammonia nitrogen and thiocyanate to enter a sequencing batch reactor, oxidizing the ammonia nitrogen into nitrite under a limited oxygen condition, and generating nitrogen, sulfate and ammonia nitrogen from the thiocyanate and the nitrite by autotrophic denitrifying bacteria; reaction effluent mixed with coking wastewater enters an upflow anaerobic sludge blanket, and anaerobic ammonium oxidation bacteria convert ammonia nitrogen and nitrite into nitrogen and generate a small amount of nitrate; and the residual nitrate, nitrite and thiocyanate are continuously and thoroughly removed through the sulfur autotrophic denitrification effect. The method provides a new idea for economical and efficient autotrophic nitrogen removal and detoxification of the coking wastewater containing thiocyanate and ammonia nitrogen.

The present invention provides an autotrophic denitrification filter material, comprising three types of materials A, B, and C, and the weight ratio of each material is A: B: C = (10-15): (1-2): 1, wherein A is a composite denitrification ingredient, including ferrous sulfide, sulfur, sodium thiosulfate and iron powder; B is an adhesive; and C is a molecular sieve treated with a microbial culture solution. The high efficiency of the autotrophic denitrification filter material with high efficiency denitrification provided by the present invention is mainly based on the following two options: first, the filter material belongs to a multivalent composite sulfide-iron coupling denitrification scheme, and the diverse electron donors of the autotrophic denitrifying bacteria have synergistic synergy; second, the autotrophic denitrifying bacteria culture solution is pre-placed in the gap of the molecular sieve, which can be slowly released, ensuring that the autotrophic denitrifying bacteria can still maintain growth when the environment is subjected to various shocks. The autotrophic denitrification filter material provided by the present invention has a simple preparation process, is easy to operate during application, and can maintain high efficiency in denitrification capacity.

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

The invention belongs to the technical field of energetic plasticizer preparation, and particularly discloses a method for preparing N-butyl nitroxyethyl nitramine through ionic liquid nitration. The method comprises the following steps: mixing an ionic liquid nitrating agent with butyl ethanolamine to obtain a mixed solution; and mixing the mixed solution with a catalyst and acetic anhydride, reacting, and carrying out post-treatment to obtain the N-butyl nitroxyethyl nitramine. According to the method, the ionic liquid with stable properties is adopted as the nitrating agent, the reaction is mild when the ionic liquid is mixed with the butylethanolamine, violent heat release caused when fuming nitric acid is in contact with the butylethanolamine is effectively avoided, and the ionic liquid precursor can be recycled through simple extraction after the reaction.

A method for synthesizing a compound 2-[(2R,5S)-5-[2-methylfuro[3,2-b]imidazo[4,5-d]pyridin-1-yl]tetrahydropyran-2-yl]acetonitr ile as a selective JAK1 / TYK2 kinase inhibitor. The compound is prepared by taking 7-chloro-6-nitrofuro[3,2-b]pyridine as the starting material, and by nucleophilic substitution, palladium on carbon reduction and cyclization reactions. The present synthesis method has mild reaction conditions, high product yield and high purity, and is suitable for industrial production. A crystal form of the compound, crystal forms of the salts thereof and preparation methods thereof. The crystal form of the compound and the crystal forms of the salts thereof have good physical and chemical properties and are suitable for drug development.

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

The invention relates to a sulfur autotrophic denitrification expanded bed and a sewage deep denitrification method thereof, and belongs to the technical field of sewage deep treatment.The sulfur autotrophic denitrification expanded bed comprises a water inlet device, a backflow device water inlet, a backflow device water outlet, a first sampling port, a second sampling port and a water drainage port, and a pebble bed, a filler layer and a clear water layer are arranged in the device from bottom to top; according to the technical scheme, a reinforced filler is loaded through a layered double hydroxide-bentonite composite material, and is combined with hydroxyl polyethylene glycol sulfydryl after being coated with elemental sulfur, so that the modified denitrification filler is obtained; the sulfur autotrophic denitrification expanded bed is filled with the modified denitrification filler, and the change of the expansion rate is realized by optimizing the particle size of the filler and controlling the reflux ratio, which reflects that the filler with smaller particle size can effectively increase the denitrification rate and improve the denitrification efficiency; through the expanded bed process, the removal effect on nitrate nitrogen, ammonia nitrogen and total phosphorus in sewage can be better enhanced, and the denitrification performance of the sulfur autotrophic denitrification expanded bed is improved.

The invention belongs to the technical field of sewage treatment, and particularly relates to a composite carbon source additive and a preparation method thereof. The composite carbon source additive comprises the following components in parts by weight: 30-40 parts of bagasse, 8-12 parts of a polyvinyl alcohol derivative, 2-4 parts of a functional filler, 5-8 parts of potassium citrate and 5-8 parts of sodium pyruvate, the preparation process of the polyvinyl alcohol derivative comprises the following steps: adding polyvinyl alcohol, 1, 3, 5-benzene trisulfonic acid, triethylamine and 4-dimethylaminopyridine into dichloromethane to react, filtering, washing and drying; the polyvinyl alcohol derivative is obtained. The composite carbon source additive can be slowly released in the denitrification process and continuously and stably provide a carbon source, the denitrification process is promoted, and the denitrification efficiency is improved.

The invention particularly relates to a low-carbon robust short-cut nitrification process, which is used for low-carbon treatment of various ammonia-nitrogen-containing wastewater. The device has the characteristics that oxygen is supplied in a manner of combining micro-nano pre-aeration with external circulation, so that the device has higher oxygen supply uniformity, the reaction rate and the DO utilization rate in the short-cut nitrification reactor are greatly improved, meanwhile, accurate oxygen supply is realized, the oxygen supply energy consumption is effectively reduced, and carbon emission is reduced; according to the invention, oxygen is supplied in a manner of combining pre-aeration with external circulation, so that the concentration of DO in the short-cut nitrification reactor is ensured, meanwhile, N2O release caused by bubble disturbance is avoided, N2O emission factors in the short-cut nitrification process are effectively reduced, and low-carbon short-cut nitrification is realized; by coupling alkaline inhibition and salt inhibition, NOB activity is effectively controlled, and long-term stability of short-cut nitrification is realized.

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

The invention discloses an anti-leaching nutrient slow-release synergistic compound fertilizer, and particularly discloses an anti-leaching nutrient slow-release synergistic compound fertilizer and a preparation method thereof. The compound fertilizer comprises the following components in parts by weight: 30-50 parts of urea particles, 15-25 parts of monoammonium phosphate, 20-30 parts of potassium sulfate, 2-5 parts of a slow-release synergistic coating agent, 1-3 parts of a bonding wrapping layer and 10-20 parts of a filling material. The slow-release synergistic coating agent comprises polyaspartic acid (PASP) and a composite inhibitor (a urease inhibitor and a nitrification inhibitor), and the bonding wrapping layer is made of a polyvinyl alcohol / sodium polyethylene acid-based cementing material. The preparation method comprises the following steps: mixing and granulating raw materials, carrying out primary coating (slow-release synergist), carrying out secondary coating (bonding a coating layer), and drying and screening. Through the synergistic effect of the double coating technology and the compound inhibitor, the nitrogen conversion and release are obviously delayed, the nutrient leaching loss is reduced by 20-40%, the fertilizer utilization rate is improved by 25-30%, and the compound fertilizer is suitable for high-temperature and rainy areas.

The application provides a method for continuously preparing nitrobenzene by using benzene and NO2 as raw materials. The method is characterized in that: a solid catalyst capable of catalyzing the nitration of benzene by NO2 is filled in a pipe reactor, benzene, NO2 and O2 are continuously fed into the pipe reactor at a certain flow rate, and the reaction is carried out at a certain temperature to obtain nitrobenzene. This route is safe, green, economical and efficient, and is a safe, green, economical and efficient nitrobenzene synthesis route.