91 results about "Dissolved nitrogen" patented technology

The invention discloses a freshwater shrimp culture tail water treatment system for treatment of the tail water of a culture pond. The freshwater shrimp culture tail water treatment system comprises:a pair of ecological ditches for preliminary purification of culture tail water, a sedimentation tank for sedimentation to remove granular solids in the culture tail water subjected to preliminary purification in the ecological ditches, a filtration dam for filtering solid particles in the culture tail water subjected to sedimentation treatment in the sedimentation tank, an aeration tank for aeration treatment of the culture tail water subjected to filtration treatment by the filtration dam, a biological purification tank utilizing fungi and animals to remove harmful substances, algae and thelike in the culture tail water subjected to aeration treatment in the aeration tank, and a constructed wetland for effective degradation of pollutants and harmful substances in the culture tail watersubjected to purification in the biological purification tank. The freshwater shrimp culture tail water treatment system provided by the invention can effectively remove solid particle impurities in culture tail water, lower the dissolved nitrogen and phosphorus content, and degrade pollutants and harmful substances. The treated culture tail water can reach the culture tail water discharge standard, and can finally be discharged into external rivers or recycle to culture ponds.

Pure water dissolving nitrogen gas and containing microbubbles is supplied to a substrate. Since microbubbles are very minute in size and also have the electrostatic property, they can efficiently adsorb particles on the substrate surface or in the pure water. Further, since pure water dissolving nitrogen gas is unlikely to be charged, the pure water itself never carries new particles from each component of the apparatus. These functions allow efficient particle removal from the substrate surface or the liquid.

Disclosed herein is a steel for high-speed cold working which exhibits good cold workability during working and also exhibits high hardness after working. The steel for high-speed cold working contains C : 0.03 to 0.6% (by mass), Si : 0.005 to 0.6%, Mn : 0.05 to 2%, P : no more than 0.05% (excluding 0%), S : no more than 0.05% (excluding 0%), and N : no more than 0.04% (excluding 0%), with the remainder being iron and inevitable impurities and the amount of dissolved nitrogen in the steel being no less than 0.006%.

The invention belongs to the technical fields of material preparation and photocatalysis, and discloses a phenyl ring modified graphite-like carbon nitride photocatalyst, and a preparation method and an application thereof. The method comprises the following steps: 1, dissolving nitrogen-containing organic micro-molecules and a phenyl ring-containing compound in a solvent, and evaporating the obtained solution until the solution is dry in order to obtain a mixed precursor; and 2, roasting the mixed precursor to obtain the phenyl ring modified graphite-like carbon nitride photocatalyst, wherein the nitrogen-containing organic micro-molecules are one or more of urea and melamine; and the phenyl ring-containing compound is one or more of trimesic acid, phenol, benzoic acid and benzaldehyde. The electron structure of the photocatalyst is changed by phenyl ring modification, so the pi electron delocalization of graphite-like carbon nitride is excited, the absorption of visible lights is improved, compounding of photon-generated carriers is inhibited, and the photocatalytic hydrogen production performance is improved. The method has the advantages of simple preparation, no expensive device and good practical application prospect.

The present invention relates to one kind of acid liquid fertilizer for drip irrigation and including nitrogen fertilizer, phosphate fertilizer, potash fertilizer, rooting promoter, dissolution promoter, trace elements and sulfuric acid. It is prepared through the steps of: dissolving phosphate fertilizer, potash fertilizer, trace elements and dissolution promoter in water through stirring, dissolving nitrogen fertilizer, adding sulfuric acid and adding rooting promoter. Its preparation process is scientific, low in power consumption and low in cost and uses simple apparatus. Its dissolution promoter can raise the dissolution degree of routine phosphate fertilizer and its rooting promoter can promote the growth of plant root system and the plant absorption capacity to nutrients. Its acidity can prevent jamming of drip holes.

There is provided an ink composition which has excellent initial filling characteristics and continuous printing stability even in a case of an ink composition (for example, dissolved nitrogen is equal to or greater than 5 ppm) which is almost not deaerated or an ink composition (for example, dissolved nitrogen is equal to or greater than 7 ppm) which is not deaerated at all.

The ink composition includes an alkylene oxide adduct (A) of acetylenic glycol in which a main chain has 12 or more carbon atoms, acetylenic glycol (B) in which a main chain has 10 or more carbon atoms, and polyoxyalkylene alkyl ether (C).

A thin-walled stainless bearing component, in particular a rolling bearing component, such as bearing ring, sleeve or bush, produced without material-removing machining by being deep-drawn from a cold-rolled strip with a carbon content of 0.15-0.25% and a chromium alloying content of at least 12%, and having a martensitic microstructure which is enriched with dissolved nitrogen at least at a side edge zone.

The invention discloses a preparing method of modified titanium oxide sol, powder and film, which comprises the following steps: (1) adding at least one titanium tetrachloride, titanium sulfate or butyl titanate in the alcohol diluent; (2) dripping the composite solution in the step (1) into hydrolytic solvent; (3) dissolving nitrogen-containing compound in the sol evenly; (4) stewing the sol; aging until producing blue white transparent sol; (5) drying the sol into dried powder to obtain titanium oxide powder; (6) filming the sol in the step (4) to form titanium oxide film.

The present invention aims to eliminate the mounting of an independent ammonia oxidation catalyst to an exhaust passage. A selective reduction catalyst comprises a catalyst support 23 in which a plurality of through holes 23b partitioned by porous walls 23a are formed and a first active component 24 carried by the walls which dissolves nitrogen oxide contained in the exhaust gas by the reaction with ammonia. Inlet portions 23c and outlet portions 23d, adjacent to each other, of the plurality of through holes 23b are alternately sealed, and the wall 23a carrying the first active component 24 has ventilation and a second active component 26 having a catalytic action so as to oxidize ammonia having passed the wall is carried on the inner surface of the though hole. An exhaust gas purifier is provided with the selective reduction catalyst 22, a liquid injection nozzle 29 which is provided on the upstream side and can inject urea liquid 32, and an oxidation catalyst 53 provided at the exhaust pipe 16 on the upstream side.

The present invention relates to a system and method for removing dissolved gas from makeup water in a water-cooled nuclear reactor. The present invention includes a storage tank for containing the makeup water that includes the dissolved gas, a membrane system positioned downstream of the storage tank to at least partially remove the dissolved gas front the makeup water; and a transport mechanism to transfer the makeup water from an outlet of the membrane system for use in the water-cooled nuclear reactor. The dissolved gas can include at least one of dissolved oxygen, dissolved nitrogen, dissolved argon and mixtures thereof.

The invention discloses a method for detecting dissolved organic nitrogen concentration in sewage based on dialysis pretreatment and belongs to the technical field of sewage treatment. The method disclosed by the invention comprises the following steps: 1) filtering a sewage sample; 2) respectively measuring concentrations of total dissolved nitrogen (TDN), ammonia nitrogen (NH4<+>) and nitrate nitrogen (NO3<->) in sewage treated in the step 1); 3) selecting one of a measurement scheme I, a measurement scheme II and a measurement scheme III according to a ratio of (NH4<+>+NO3<->) to TDN and a ratio of NO3<-> to NH4<+>; and 4) calculating the dissolved organic nitrogen concentration in the sewage according to the numerical value obtained in the measurement scheme selected in the step 3). The method for detecting the dissolved organic nitrogen concentration in sewage provided by the invention does not need a preliminary experiment, is simple and convenient in operation and low in cost and can be widely applied to measurement of the dissolved organic nitrogen concentration in the sewage.

The invention provides a method for directly measuring concentration of DON (Dissolved Organic Nitrogen) in water body based on an electrodialysis pretreatment manner. The method is characterized by comprising the following steps: firstly, quickly and effectively separating DON from DIN (Dissolved Inorganic Nitrogen) by adopting an electrodialysis separation technology, and then directly obtaining the DON concentration through the TDN (Total Dissolved Nitrogen) test. The purpose of the electrodialysis is to remove the DIN and retain the DON; when the content of DON accounts for a major part of the TDN (for example, the proportion of the DIN to the TDN is smaller than 0.1) in a treated water sample, the electrodialysis treatment is stopped, and after a while, the content of the TDN is equal to the content of the DON in the water sample. The method greatly improves the accuracy and precision of the DON measurement in the water sample, solves the problems that the conventional water sample DON measuring method is indirect, and low in accuracy and precision, and consumes time, can be widely applied to the DON detection in various water bodies, and also can be used for measuring the DON in solid particles or atmospheric haze particles capable of being dissolved in water.

The invention belongs to the field of material preparation, and specifically relates to a preparation method for a nitrogen-rich hierarchical pore carbon material. The preparation method comprises the following steps of dissolving nitrogen-rich monomers and aldehydes into a solvent I and a solvent II respectively; uniformly dispersing and then mixing, adding a catalyst to adjust the pH value and the reacting temperature; reacting for 2-12h, repeatedly washing the product for 2-3 times by an elution solvent under a centrifuging or ultrasonic effect after the reaction is finished; and drying the product at a temperature of 40-80 DEG C to obtain a nitrogen-rich porous polymer material; and carbonizing the product obtained in the step 1) under the protection of an inert gas at a temperature of 600-1,200 DEG C for 3-8h to obtain the nitrogen-rich hierarchical pore carbon material. The carbon material prepared by the invention contains a large amount of nitrogen elements, and has a quite large specific surface area and a special porous structure; and the carbon material is 200-1,600m<2>/g in the specific surface area, 1-100nm in the pore diameter distribution, and 2-30% in the nitrogen content.

A non-aqueous ink jet composition includes a pigment component containing a diketopyrrolopyrrole pigment and an organic solvent. The organic solvent contains glycol ethers. The amount of dissolved nitrogen in the non-aqueous ink jet composition is 90 mass ppm or less based on the total amount of the non-aqueous ink jet composition.

The invention relates to a fertilizer and water regulation and control device with solar photovoltaic power generation supplying power for a chemical sensor, belonging to the technical field of new energy Internet of things. Sunlight irradiates a solar battery installed on the top end of a photovoltaic chemical sensor inserted link to generate current, and current is supplied to the chemical sensor through a conductor wire and a controller. The lower part of the chemical sensor is soaked in the water layer of a rice field for sensing the concentration changes after nitrogen fertilizer and phosphorus fertilizer are applied to the rice field and converting the change of chemical amount into electric signals. A transmitting antenna installed on the chemical sensor transmits the electric signals into air, and after receiving the electric signals, a receiving antenna inputs the electric signals into a computer processor for processing. According to the concentrations of actually dissolved nitrogen fertilizer and phosphorus fertilizer in the water layer of the rice field and the growth development condition of rice plants, precise amounts of applied fertilizers of the nitrogen fertilizer and phosphorus fertilizer are displayed on a display, and a suggestion for applying fertilizer is printed and handed to rice field managerial personnel for implementation.

The invention discloses a composite fertilizer suitable for a shrimp culturing paddy field and a preparation method thereof, and relates to the technical field of chemical fertilizer preparation. Thefertilizer comprises a nitrogen-phosphorus-potassium basic fertilizer, according to the composite fertilizer, the content of slow-dissolved nitrogen takes up 10% or above of the total nitrogen, soluble silica takes up 0.05% or above, soluble magnesium takes up 0.05% or above, biological activated calcium takes up 0.5% or above, and polymeric phosphorus takes up 20% or above of total phosphorus mass. The composite fertilizer has the advantages that nutritious ingredients can be slowly released, long-term effect is achieved after base application, topdressing times can be reduced, water body quality can be stabilized, labor intensity can be relieved, the loss of nutritious components is reduced, the fertilizer utilization rate is improved, the growing of rice is promoted by abundant medium or micro elements to improve the stress resistance of lodging resistance, disease resistance and the like of rice, the yield and income are increased, crayfish disease resisting and encroaching resistance are improved, the growing of crayfish is accelerated, so that the crayfish has large size, and labor force is saved while paddy field ecological environmental is protected.

The invention provides a method of converting nitrogen into ammonia. The method comprises contacting an electrocatalyst with an aqueous solution of dissolved nitrogen gas. The electrocatalyst comprises carbon nanospikes dopped with nitrogen

A process for removing urea from water, the concentration of urea in the feed water being less than 1 ppm, the process comprising the steps of adding a nitrite ion to the water and of then passing the water through a strong cation exchange resin in an ion exchange column is provided. The molar ratio of nitrite to urea is preferably between 50 and 1500. The urea reacts with the nitrite to form dissolved nitrogen and carbon dioxide gases, and ammonium. The ammonium is removed in the ion exchange column. There may be two columns in series. The nitrite may be added in the form of a sodium nitrite salt, nitrous acid, or nitrogen dioxide gas. The excess of nitrite present in the treated water may be removed with an anion exchange resin, by reaction with an oxidant, or with a reverse osmosis treatment step. Regeneration of the column is triggered by a measurement of the pH or of the conductivity and is conducted with an acidic solution.

The invention discloses an online continuous dehydration and deoxidation method for aviation fuel oil. The method comprises the following steps: step a, forcefully mixing aviation fuel oil containing dissolved oxygen and dissolved water with dry nitrogen gas in a static pipeline mixer to dissolve the nitrogen gas so as to replace the dissolved oxygen and dissolved water with the dissolved nitrogen; step b, introducing the oil-gas mixture obtained in the step a into a swirling separator so as to carry out primary oil-gas separation, discharging tail gas containing some aviation fuel oil from the outlet in the top part of the swirling separator, and discharging the dehydrated and deoxidized aviation fuel oil from the bottom of the swirling separator. Preferably, in the step a, the aviation fuel oil containing dissolved oxygen and dissolved water is pressurized and atomized into spray through an atomizing nozzle, and then the fuel oil spray is forcefully mixed with dry nitrogen gas in the static pipeline mixer.

The invention relates to the technical field of aquaculture discharged water recycling, in particular to a fish, prawn, algae, abalone and sea cucumber circulating water ecological comprehensive breeding system. The system comprises a fish breeding pond, a prawn breeding pond, an ecological filtering pond, an algae, abalone and sea cucumber ecological breeding garden, a primary composite verticalflow artificial wetland, a secondary deep treatment composite vertical flow artificial wetland and a reservoir. The fish breeding pond and the prawn breeding pond are connected in parallel; breeding discharged water flows into the ecological filtering pond to be primarily purified, then sequentially flows through all stages of purification tanks so that residual bait and excrement generated by aquaculture can be effectively filtered away and dissolved nitrogen, phosphorus nutrients and organic matter in a water body can be deeply purified, and then the discharged water is circulated to the breeding ponds after being disinfected, sterilized and subjected to oxygen increase. By means of the step-by-step purification modules, the pollutant purification efficiency in the water body is improved, and fully-closed recycling of the aquaculture water body is achieved; meanwhile, plants planted by the purification modules and aquatic organisms bred by the purification modules have remarkable ecological benefits and economic benefits.

The invention discloses a method for leaching scandium, rare earth, rare elements and scattered elements from raw ores. The method includes the steps: ball-milling the raw ores to reach the particle size of below 50 meshes, and stacking the raw ores according to the requirement of a dump leaching process; dissolving nitrogen fertilizers and nitric acid compound salt serving as a leaching agent inwater, and sufficiently dissolving the nitrogen fertilizers and the nitric acid compound salt by stirring to obtain leaching agent solution; finally, uniformly spraying the leaching agent solution tothe top surface of an ore heap, and leaching scandium, the rare earth, the rare elements and the scattered elements under the condition of natural normal temperature. Leaching rate is high, the process method is simple, low in energy consumption, green, environmentally friendly and low in process cost, environments and soil cannot be polluted or destructed, and land fertility can be increased.

A membrane entrance mass spectrometer based method for analyzing content of dissolved nitrogen isotope comprises the following steps: 1, introducing helium into the liquid to be tested for 20 min to remove nitrogen dissolved in water; 2, adding an oxidant iodine hypobromite solution in the liquid to be tested with nitrogen removed to oxidize ammonia nitrogen into nitrogen; 3, determining a standard curve through a standard sample membrane entrance mass spectrometer; 4, measuring the liquid to be tested from the step 2 by the membrane entrance mass spectrometer, and calculating the content of nitrogen isotope in the ammonia nitrogen liquid; 5, removing the original ammonia nitrogen in the liquid to be tested treated in the step 2 by magnesium oxide, acidifying with sulfuric acid, then reducing nitrate to ammonia nitrogen by zinc powder, and then use the above step 2 to step 4 to obtain the content of nitrate nitrogen isotope in the solution. The method provided by the invention can fast and accurately measure and analyze the content of dissolved nitrogen isotope, and is conducive to promoting the application of nitrogen isotope tracer technique.