211 results about "Ammonia nitrogen" patented technology

The invention discloses an ammonia nitrogen detection system and an application method thereof, and ammonia nitrogen detection test paper, the ammonia nitrogen detection system is prepared by the following steps: step SA1) preparing a dipping mixed solution, the dipping mixed solution comprises: a potassium sodium tartrate solution with a concentration of 3-60 g / L; a sodium salicylate solution with a concentration of 20-320 g / L; the concentration of the sodium nitroprusside solution is 0.1 to 0.8 g / L; and deionized water. On the basis of the principle of salicylic acid-pypocholoride spectrophotometry, the impregnated test paper, the reagent tube and the standard colorimetric card are combined, and the rapid ammonia nitrogen detection system special for medium-concentration sewage detection is successfully developed. The toxicity problem of mercury iodide in a Nessler reagent method and the toxicity problem of phenol in a phenol-pypocholoride spectrophotometric method are avoided, main reagents are non-toxic and harmless to a human body, interference of metal ions in a water sample can be effectively eliminated by adopting sodium potassium tartrate tetrahydrate as a chelating agent, and the detection stability and accuracy are improved.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a treatment method of high-concentration ammonia-nitrogen wastewater. The treatment method comprises the following treatment steps: (1) pretreatment of high-ammonia-nitrogen wastewater: adding an acidic solution into to-be-treated high-ammonia-nitrogen wastewater, adjusting the pH value of the system to 3 or below, then adding a regulating agent NaNO2, and uniformly mixing; and (2) high-temperature hydrothermal treatment: putting the mixed wastewater pretreated in the step (1) into a closed hydrothermal reactor, heating to 120-180 DEG C, carrying out high-temperature hydrothermal reaction, cooling after the reaction is completed, obtaining treated produced water, and collecting produced nitrogen. According to the treatment method, the hydrothermal reaction is regulated and controlled based on cooperation of acid and sodium nitrite, the method is carried out under high-temperature and high-pressure conditions, the reaction rate can be increased, the treatment time can be shortened, and the treatment efficiency can be improved. The problems that in an existing high-ammonia-nitrogen wastewater treatment technology, the ammonia nitrogen treatment concentration is low, the process technology is complex, and secondary pollution is generated are solved.

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.

This invention discloses a method for preparing high-purity zirconium oxide, belonging to the field of compound preparation technology. The method provides a breakthrough adjustment of the final concentration state and the cooling process after concentration and evaporation of an acidic zirconium oxychloride solution under the action of an oxidant. Simultaneously, crystallization is achieved through a two-stage concentration and evaporation process, followed by calcination to obtain hafnium-free zirconium oxide. The resulting zirconium oxide not only has a high yield but also high purity. Furthermore, the technical solution of this invention avoids the generation of ammonia nitrogen wastewater as in existing technologies, thus not only avoiding environmental impact but also significantly reducing production costs through the recycling of hydrochloric acid condensation, achieving a green and environmentally friendly effect.

The invention belongs to the technical field of electro-catalysis, and particularly relates to a perylene-based composite material electrode with Ni loaded on carbon cloth and application of a preparation method of the perylene-based composite material electrode in electro-catalysis nitrate reduction. The preparation method comprises the following steps: dissolving perylene-3, 4, 9, 10-tetracarboxylic dianhydride, imidazole and 2, 4, 6-tri (4-aminophenyl)-1, 3, 5-triazine in DMF (Dimethyl Formamide), continuously refluxing for 48 hours under the condition of stirring at 180 DEG C, repeatedly cleaning with DMF, and drying to obtain a perylene-based material; the preparation method comprises the following steps: dissolving nickel nitrate hexahydrate, thiourea and a perylene-based material in tetrahydrofuran (THF), reacting at 160 DEG C for 24 hours, centrifuging, washing and drying to obtain the perylene-based composite material of Ni, which is stable in structure, convenient to synthesize and good in catalytic performance. The composite material is prepared into printing ink, carbon cloth is coated with the printing ink, a reduction electrode is prepared, the electrode is used for electro-catalysis of nitrate radicals, the Faraday efficiency is 31.49% under-1.2 V v.s.RHE, the ammonia nitrogen yield is up to 357.70 mmol h <-1 > g <-1 >, and the electrode has excellent nitrate radical reduction catalytic activity.

The invention relates to electrochemical treatment of nitrate wastewater, in particular to a preparation method and application of an atomic-scale dispersed copper and cobalt bimetallic catalyst. Comprising the following steps of (1) a Cu precursor preparation method, (2) a Co precursor preparation method, (3) high-temperature pyrolysis and (4) a redundant metal component removal method. The atomic-scale dispersed copper and cobalt bimetallic catalyst disclosed by the invention has relatively high metal loading capacity and relatively high stability. When the Cu-Co-N-C catalyst is applied to the nitrate electroreduction reaction, the toxic by-product nitrite is obviously reduced, the conversion rate of nitrate is obviously improved, and the ammonia nitrogen selectivity is obviously improved.

The invention discloses a mixed matrix membrane for ammonia separation and a preparation method thereof, polyether block polyamide (Pebax) rich in ether bonds and a liquid adsorbent are dissolved in a solvent, reflux stirring is performed to obtain a membrane casting solution, then the membrane casting solution is coated on a substrate, the solvent is heated to volatilize, and the final mixed matrix membrane is obtained. Benefited from the strong ammonia gas affinity of the Pebax polyether chain segment and the liquid adsorbent, the obtained mixed matrix membrane has an efficient ammonia separation effect, and when the mixed matrix membrane is used for separating synthesis ammonia residual gas, the ammonia permeability can reach 2656.9 Barrer, and the ammonia / nitrogen selectivity and the ammonia / hydrogen selectivity reach 594.1 and 150.8 respectively.

The invention relates to the technical field of microorganisms, in particular to a low-temperature-resistant denitrification strain and application thereof in a recirculating aquaculture system. The nitrogen removal bacterial strain is halomonas piezotolans YX98, and the preservation number of the halomonas piezotolans YX98 is CCTCC (China Center for Type Culture Collection) NO: M 20242820. The strain YX98 has an efficient denitrification function and also has the characteristics of low temperature resistance and halophile. The strain is inoculated into simulated wastewater with the temperature of 15 DEG C and the salinity of 20% o, and the degradation rates of ammonia nitrogen, nitrite nitrogen and nitrate nitrogen are as high as 96.15%, 98.20% and 99.99% respectively; when the strain is applied to a salmon and trout circulating mariculture system as a low-temperature fungicide, the NH4 < + >-N and NO2 <->-N degradation function of a moving bed bio-membrane reactor can be enhanced, so that the duration of a function starting period is shortened by 43.75%, and the duration of a function stable period is shortened by 26.32%.

The invention discloses a copper particle catalyst electrode containing abundant dislocation defects and a preparation method and application thereof, and the preparation method comprises the following steps: (1) dissolving tungstate, copper salt and urea in water, stirring and mixing; (2) putting the solution into a hydrothermal kettle for hydrothermal reaction, and then washing and drying solid powder obtained by the reaction; (3) calcining the solid powder in air to obtain CuWO4 powder; (4) loading CuWO4 powder on an electrode substrate to prepare a working electrode; and (5) performing electrochemical reduction on the working electrode to obtain the copper particle catalyst electrode containing rich dislocation defects. The defect sites of the electrode can regulate and control the electronic structure of copper, construct low-coordination copper and enhance the binding capacity to nitrogen intermediate products, so that nitrite accumulation is reduced, and the reaction activity and ammonia nitrogen selectivity are improved.

The present invention discloses a Bacillus velezensis GY1, which was deposited in the Guangdong Provincial Microbial Culture Collection Center on June 28, 2024, with a deposit number of GDMCC No: 64792. The Bacillus velezensis GY1 provided by the present invention can degrade 100% and 56.4% of nitrogen in M9 culture medium containing 200 mg / L and 1000 mg / L ammonia nitrogen, respectively, and the ammonia reduction rate in the actual production of aquaculture water reaches 53.3%. It also has a strong inhibitory effect on common pathogens in aquatic products: Vibrio alginolyticus, Salmonella and Vibrio parahaemolyticus.

The invention discloses a water quality conditioning agent based on plant extracts and a preparation method of the water quality conditioning agent, and belongs to the technical field of aquaculture. The water quality conditioning agent is prepared from the following raw materials in parts by weight: 14 to 18 parts of fructus schisandrae chinensis extract, 4 to 5 parts of fructus mume extract, 10 to 13 parts of rhizoma coptidis extract, 8 to 10 parts of glucosamine, 5 to 8 parts of chitosan, 3 to 6 parts of nitrifying bacteria, 2 to 4 parts of thiobacillus thiooxidans and 3 to 6 parts of zeolite powder. Through a four-dimensional synergistic mechanism of'plant active ingredient-chitosan slow release-microbial immobilization-zeolite adsorption ', the pH value, ammonia nitrogen, nitrite, hydrogen sulfide and bottom mud COD in tail water can be reduced and the dissolved oxygen amount can be increased under the condition of one-time addition, which indicates that the water quality regulator has a good effect of improving water quality.

The embodiment of the application provides a kind of multi-parameter collaborative SCR ammonia injection control method, device, equipment and medium, related to coal-fired flue gas denitration technical field, method includes: obtaining the inlet flue gas flow and inlet nitrogen oxide concentration of flue gas inlet flue, according to inlet flue gas flow and inlet nitrogen oxide concentration, calculate theoretical ammonia nitrogen molar ratio;According to theoretical ammonia nitrogen molar ratio and ammonia water concentration correction coefficient, calculate basic ammonia injection amount;Obtain the reaction data of ammonia water and flue gas in reactor, based on reaction data, dynamically adjust basic ammonia injection amount to obtain final ammonia injection amount, and adjust the ammonia injection amount of ammonia injection pipeline to final ammonia injection amount.The application can realize the accurate and efficient control of the ammonia injection amount of SCR ammonia water denitration system.

The application provides a zinc ion modified zeolite and a preparation method and application thereof. 2+ The modification of the zeolite by the zinc ion can balance the negative charge on the zeolite, so that the modified zeolite has reduced electrostatic repulsion to anions and can have more groups capable of combining with phosphates, and thus has the ability to remove phosphates. 2+ In the process of dynamically adsorbing ammonia nitrogen and phosphates in simulated and actual wastewater in a transfer station, the Thomas model is used for fitting. 2+ The adsorption capacity of the modified zeolite to the simulated water reaches 4.49 mg NH3-N / g and 3.04 mg P / g, and the adsorption capacity of the modified zeolite to the actual water reaches 2.35 mg NH3-N / g and 3.63 mg P / g. 2+ The modified zeolite has good adsorption effect on nitrogen and phosphorus in the continuous flow treatment of the actual water.

The invention relates to the field of aquatic product muscle quality regulation and control. A method for improving muscle quality of fish by regulating intestinal microenvironment through a neuroendocrine system is characterized by comprising the following steps: 1) sterilizing a temporary rearing pond, injecting aerated water to 2 / 3 of the height of the temporary rearing pond, and regulating dissolved oxygen in the water to be 5.0-8.0 mg / L, water temperature to be 16-24 DEG C, pH to be 7.2-8.0 and ammonia nitrogen content to be lower than 0.5 mg / L by using an aerator; (2) adding a mixed input of 50-100 mg / L of lactobacillus brevis MN047 and 20-50 mg / L of lotus rhizome node extract into the water, and stirring to enable the mixed input to be uniformly dispersed; (3) putting fresh and alive freshwater fishes into the temporary rearing pond according to the rearing density of 20-30kg / m < 3 >, and fasting the fishes during temporary rearing; (4) temporary rearing; 5) waiting for detection in a refrigerator at-80 DEG C; (6) determining; and 7) analyzing the data. According to the method, the stress reaction can be relieved after fish stress, neurotransmitters are secreted, intestinal microbial flora is regulated, and then muscle quality deterioration caused by the stress reaction is relieved.

The invention discloses a synthetic ammonia nitrogen wash tail gas treatment process, and belongs to the technical field of nitrogen wash tail gas treatment.The synthetic ammonia nitrogen wash tail gas treatment process comprises the following specific steps that firstly, nitrogen wash tail gas is pressurized to 1-4 MPa and enters a mixing preheating reactor; 2, preparing alkali from a potassium hydroxide solution to 48%-60% through condensate water, increasing the pressure to 1-4 MPa, preheating, and feeding into a mixing and preheating reactor; step 3, CO in the nitrogen wash tail gas reacts with potassium hydroxide to generate potassium formate, a proper amount of formic acid is added for neutralization, and a product liquid 74% potassium formate is obtained after evaporation, or a solid potassium formate product 97% or above is obtained after evaporation concentration and spray drying; 4, H2 and N2 do not react and are separated into tail gas through pressure relief, the tail gas is condensed till P is smaller than or equal to 1.2 MPa and then returns to an ammonia synthesis system, and the tail gas serves as raw material gas to be continuously utilized after being pressurized. And through the designed filtering and compressing device, the cost of potassium formate and monopotassium phosphate is reduced, the project investment is small, and the product income is increased.

The application provides a multistage remediation method for ion-type rare earth tailing area soil composite pollution, aiming at the vertical pollution structure of "surface layer barren-mid-layer heavy metal / radioactivity-deep layer high ammonia nitrogen", and innovatively adopting a "partitioning, different quality, one layer one strategy" strategy. Specifically, the method comprises the following steps: layering and excavating 0-30cm surface layer, 30-50cm mid-layer and >50cm deep layer earthwork; mixing the deep layer earthwork with nitrogen directional conversion coupling material and composite microbial inoculant to construct an ammonia nitrogen targeted removal layer; mixing the mid-layer earthwork with porous matrix coupling stabilizer and functional microbial inoculant to form a heavy metal / radioactivity stable layer; mixing the surface layer earthwork with composite soil conditioner to build a soil improvement layer; and finally planting heavy metal resistant plants. Through the "special material-functional flora-vertical coordination" trinity design, the method realizes accurate, efficient and radical remediation of the whole profile, and avoids resource waste and secondary disturbance.

This invention discloses a method for SCR denitrification control of sintering flue gas based on operational cost optimization, comprising the following steps: S1, establishing an equation for the required heating gas flow rate for SCR denitrification of sintering flue gas based on actual production performance; S2, establishing an ammonia-nitrogen molar ratio model based on SCR denitrification production data of sintering flue gas; S3, obtaining the ammonia consumption based on the ammonia-nitrogen molar ratio model; S4, establishing an SCR denitrification operating cost equation based on the ammonia consumption and heating gas flow rate; S5, optimizing the SCR reaction temperature based on the SCR denitrification operating cost equation, and obtaining the optimized heating gas flow rate and ammonia consumption accordingly; S6, controlling the SCR denitrification of sintering flue gas based on the optimized data from S5. This invention calculates the lowest-cost heating gas and ammonia injection rates based on the actual operating data of the sintering flue gas SCR denitrification device, thereby achieving optimal SCR denitrification operating costs.

The present invention discloses a photoanode material applied to the synchronous treatment of ammonia nitrogen and refractory organic compounds in high-chloride wastewater by photoelectrocatalysis. It is characterized in that tungsten oxide is in-situ loaded on doped-fluorine SnO2 conductive glass in sequence by layer, oriented crystal plane bismuth vanadate with a carrier space pre-separation structure is hydrothermally grown, and cobalt borate salt cocatalyst is photo-assisted electro-deposited, which greatly improves the photoelectric performance from multiple perspectives such as the effective separation of photo-generated electrons and holes, the charge transfer resistance at the photoanode / solution interface, and the conversion rate of photo-generated holes to redox equivalent substances. The photoelectrochemical system using it as the photoanode realizes the in-situ generation of strongly oxidizing active chlorine by using chloride ions, promotes the oxidation of refractory organic compounds and ammonia nitrogen, effectively controls the generation amount of nitrate nitrogen at the same time, improves the denitrification efficiency, and has the advantages of high efficiency and stability in the synchronous removal process of ammonia nitrogen and refractory organic compounds in high-chloride wastewater.

This invention relates to the field of operation and maintenance service management technology, and discloses a method and system for operation and maintenance service management of biogas slurry resource utilization, including: Step 1, establishing batch sampling and actual measurement, establishing a plot table, and obtaining nitrogen deficit; Step 2, calculating volume, intensity, and acidification dosage according to the parameter table, locking the process, and generating a prescription list; Step 3, using capacity and safety margin constraints for loading, segmenting by particle size, calculating weights, and locking the scheduling table; Step 4, acidifying and mixing thoroughly and verifying to the target pH, weighing and verifying again upon delivery, issuing a metering slip and shipping; Step 5, retesting pH and ammonia nitrogen to verify the prescription, and if qualified, the on-site parameters are read-only; Step 6, applying at a constant rate according to the prescription, reconciling dual-track metering, and recording faults for exceeding tolerances; Step 7, calculating the loss rate based on delivery, dual-track, and on-site actual measurement, comparing with thresholds for correction, and calculating the achievement rate of the three items. This invention realizes deterministic scheduling, unified metering standards, and traceable closed-loop management of biogas slurry throughout the entire process from delivery to soil application.

The invention discloses an advanced treatment method of manganese residue leachate, which comprises the following steps: mixing the manganese residue leachate and hydrogen peroxide, stirring, adjusting the pH value of the system to be greater than or equal to 11, adding carbonate for precipitation reaction, stirring, adding a flocculant for flocculation reaction, filtering, and sequentially performing ultrafiltration treatment, cyclic ammonia nitrogen removal treatment, cyclic absorption and evaporative crystallization on the filtrate, an ammonium sulfate product is obtained. Compared with a conventional method, the advanced treatment method for the manganese residue leachate can efficiently and thoroughly remove metal ions and ammonia nitrogen in the manganese residue leachate, meanwhile, an ammonium sulfate product with high purity can be obtained, the purity exceeds 98%, resource utilization of the ammonia nitrogen can be achieved, and the method is suitable for industrial production. The method has the advantages of simple process, low treatment cost, high treatment efficiency, good metal ion removal effect, high ammonia nitrogen recovery rate, high ammonium sulfate purity and the like, and is high in use value and good in application prospect.

The present invention belongs to the field of engine testing technology and discloses an engine test bench measurement and control system alarm method, comprising determining whether the engine is in a preset operating condition. If the engine is in the preset operating condition, test data validity monitoring is performed; test data validity monitoring includes: urea injection amount data verification; urea injection amount data verification includes: determining the actual ammonia nitrogen ratio based on the urea injection amount data and ECU SCR upstream nitrogen oxide emission measurement data; if the actual ammonia nitrogen ratio is not within a preset range and the duration is greater than a first preset time, the urea injection amount data is judged to be abnormal and a urea injection amount data abnormality alarm is issued. The engine test bench measurement and control system alarm method of the present invention determines whether there is a problem with the urea injection amount data based on the actual ammonia nitrogen ratio, and when it is determined that there is a problem with the urea injection amount data, an alarm is issued to alert the tester, allowing the tester to promptly troubleshoot the problem and choose to continue or stop the test.

The present application relates to a kind of sulfur-based magnesium-containing autotrophic nitrogen and phosphorus removal biological carrier and its preparation method and application, belong to water deep processing field.The sulfur-based magnesium-containing autotrophic nitrogen and phosphorus removal biological carrier includes matrix material and active material distributed in the inside and / or at least part of surface of the matrix material;The matrix material includes elemental sulfur and sulfur compound;The active material includes basic magnesium-containing compound and / or mineral containing basic magnesium-containing compound.The sulfur-based magnesium-containing autotrophic nitrogen and phosphorus removal biological carrier has the ability of easy-to-use sulfur form by denitrification process and automatic adjustment system pH value, realizes deep denitrification and nitrogen removal, and the dissolved magnesium ion is transported into cell by improving ammonia nitrogen efficiency and forms phosphate precipitate, and the carrier is endowed with the function of efficient removal of ammonia nitrogen and phosphate.The sulfur-based basic magnesium-containing functional material provided by the present application is applied to deep processing or ecological buffer zone and other scenes, and can realize the coordinated deep removal of nitrate nitrogen, ammonia nitrogen and phosphate, and has wide application prospect.

The invention relates to the technical field of microbial denitrification, in particular to a salt-tolerant composite denitrifying bacterium, application thereof and a salt-tolerant denitrification composite microbial agent. The salt-tolerant composite denitrifying bacteria comprise klebsiella pneumoniae TYF-CJJ-P06 and klebsiella pneumoniae TYF-CJJ-P07, and the salt-tolerant composite denitrifying bacteria comprise klebsiella pneumoniae TYF-CJJ-P06 and The salt-tolerant composite denitrifying bacteria can simultaneously remove nitrate nitrogen and ammoniacal nitrogen in a water body, has relatively strong adaptability to a high-salinity environment, can be used for removing organic nitrogen in some high-salinity wastewater such as pharmaceutical wastewater, printing and dyeing wastewater, food wastewater and kitchen waste wastewater, has the advantages of environmental friendliness and strong applicability, and can remove phenol at the same time.

The invention belongs to the technical field of pathogenic bacterium wastewater treatment, and particularly relates to a method capable of effectively and synergistically removing ammonia nitrogen and pathogenic bacteria in wastewater. According to the method, in a water body in which ammonia nitrogen and pathogenic bacteria coexist, the two pollutants are removed at the same time by utilizing the oxidation-sterilization synergistic effect of Fe (VI) / PAA. Pollutant ammonium nitrogen in the oxidation system serves as a resource to participate in removal of pathogenic bacteria, the existence of ammonium nitrogen promotes generation of intermediate oxidation products Fe (IV) and Fe (V) of potassium ferrate, then the oxidation inactivation capacity of the system is enhanced, the inactivation time of the pathogenic bacteria in wastewater is effectively shortened, meanwhile, nitrogen is converted into nitrogen, nitrate and the like, the removal rate of NH4 < + > within 30 min reaches 98.6%, and the removal rate of potassium ferrate reaches 98.6%. The total nitrogen removal rate reaches 97.2%, pathogenic bacteria inactivation and ammonium salt removal are carried out at the same time, and a new thought and technology are provided for removing pathogenic bacteria and ammonium salt in water treatment.

The invention discloses an EGR (Exhaust Gas Recirculation) type ammonia-diesel fuel engine system, an aftertreatment system and an aftertreatment method, and relates to the technical field of engine aftertreatment, and the EGR type ammonia-diesel fuel engine aftertreatment system comprises a backflow pipeline, an EGR valve, a first-stage SCR (Selective Catalytic Reduction), a second-stage SCR, an ammonia sensor, a nitrogen-oxygen sensor and a control module. The EGR type ammonia-diesel fuel engine is combined with the double-SCR system, N2O generated by original emission enters a cylinder through the EGR system to be combusted and decomposed again, and generation of N2O in the original emission of the ammonia-diesel fuel engine is reduced. The original discharged ammonia nitrogen ratio is reasonably controlled through the EGR valve and the original machine, so that unburned ammonia of the original machine can be completely converted through the preceding-stage SCR system and the preceding-stage ASC system, the ammonia is prevented from leaking and entering subsequent DOC and DPF, the problem that N2O emission is too high is avoided, and therefore the limiting value requirement of the next-generation emission regulation is met.

The application provides a method for treating Fuling preserved vegetable wastewater by adding alkali-treated diatomite minerals into the Fuling preserved vegetable wastewater; or a method for treating Fuling preserved vegetable wastewater by adding untreated diatomite minerals into the Fuling preserved vegetable wastewater, carrying out solid-liquid separation after a period of reaction, filtering out the solid part, and then adding alkali-treated diatomite minerals into the liquid part. The method can effectively adjust the pH value of the Fuling preserved vegetable wastewater, reduce the content of ammonia nitrogen in the Fuling preserved vegetable wastewater, and improve the purity of the diatomite minerals. The method for treating Fuling preserved vegetable wastewater has the advantages of simplicity, feasibility, low operation cost, and no potential environmental threat, and is a green and environmentally-friendly treatment method, which can effectively improve the treatment effect of the Fuling preserved vegetable wastewater.

The invention relates to the technical field of biological treatment of urban domestic sewage, in particular to a stable deep denitrification method for aerobic granular sludge based on a reactor, which is characterized in that the reactor is operated by adopting a gradient water inlet mode combined with a dissolved oxygen regulation and control strategy, that is, short-time rapid water inlet is applied before slow water inlet to create an unbalanced external carbon source supply condition; internal carbon source storage and enrichment of slow-growing microorganisms such as phosphorus-accumulating bacteria and glycogen-accumulating bacteria are promoted, so that the stability of the particle structure is enhanced; the dissolved oxygen of the reactor main body is gradually reduced to 2 mg / L so as to reduce the inward permeation of the dissolved oxygen, increase the internal anaerobic zone and improve the denitrification rate, and meanwhile, a transient high oxygen exposure condition is set at the tail end of the aerobic stage so as to form high hydraulic shear force to further maintain the stability of the particles. The structure regularity, the mechanical strength and the denitrification performance of the aerobic granular sludge are remarkably improved, the average removal rate of ammonia nitrogen and the average removal rate of total nitrogen are stabilized at 97.84% and 88.87% or above respectively, the synchronous nitrification endogenous denitrification efficiency reaches 92.10% or above, and long-term stable operation of the system is guaranteed.

To provide a water treatment apparatus and a water treatment method which can progress nitrification and denitrification sufficiently in 1 cycle and optimize treatment efficiency in a water treatment where a nitrogen component in water to be treated is subjected to intermittent aeration treatment.SOLUTION: To solve the problem in a water treatment for removing a nitrogen component in water to be treated by intermittent aeration operation, presented herein are: a water treatment apparatus and a water treatment method using the apparatus thereof for controlling an operation concerning a discharge mechanism of a treatment tank and / or a time to input water to be treated to the treatment tank in a processing time in a predetermined 1 cycle and on the basis of the measured results of a nitrate nitrogen concentration or an ammonia nitrogen concentration, wherein an operation relating to agitation during aeration and terminated aeration is set to 1 cycle. According to the present invention, especially sufficient progressing of nitrification, discharge of an untreated nitrogen component to the outside of the treatment tank and continuous treatment while untreated nitrogen components are remaining are suppressed, and the optimization of treatment efficiency concerning intermittent aeration treatment is enabled.SELECTED DRAWING: Figure 1

The present application belongs to the field of waste resource utilization and hydrometallurgy, and particularly relates to a method for preparing vanadium pentoxide by using organic amine flue gas desulfurization residue, which adopts melamine method flue gas desulfurization residue as a vanadium precipitation agent. Under acidic conditions, the organic amine flue gas desulfurization residue can react with vanadate to generate more stable organic amine vanadate precipitate. After filtration, the precipitate is high-temperature calcined to obtain high-purity powder vanadium pentoxide. Compared with the current ammonium sulfate salt vanadium precipitation method, the present application has higher precipitable vanadium concentration, low ammonia nitrogen concentration in wastewater, and no need for heating in the reaction process, and is an environmentally friendly and low-cost vanadium pentoxide preparation technology.