521 results about "Nitrate nitrogen" patented technology

The invention relates to a Fenton-like functional filler which is prepared from 10-20% of iron particles coated with a carbonized film, 10-20% of aluminum sulfate modified straw, 20-30% of PBAT-coated calcium peroxide, 20-30% of diatomite and 10-30% of an adhesive. A processing method of a Fenton-like functional filler comprises the following steps: uniformly mixing iron particles coated with a carbonized film, aluminum sulfate modified straws, PBAT-coated calcium peroxide and diatomite, then adding an adhesive, mixing isocyanate serving as the adhesive with polyol according to a volume ratio of 1: 5, and continuously and uniformly mixing; then the mixed raw materials are injected into a mold coated with a release agent in advance, the mold temperature ranges from 40 DEG C to 60 DEG C, the foaming curing time ranges from 15 min to 20 min, and the Fenton-like functional filler can be obtained. The invention relates to an application of a Fenton-like functional filler in constructed wetlands. The method has the beneficial effects that the method is not influenced by temperature, and the removal effect of the constructed wetland on nitrate nitrogen and refractory COD (Chemical Oxygen Demand) can be obviously enhanced.

The utility model provides a low-carbon high-efficiency biochemical system control system. The low-carbon high-efficiency biochemical system control system comprises an internal reflux control module, a carbon source adding module and a precise aeration module, the internal reflux control module is used for refluxing nitrate nitrogen required to be denitrified to the anoxic tank for denitrification; the carbon source adding module is used for giving the current required dosage through online nitrate nitrogen instruments arranged in an anoxic tank and an aeration tank according to dynamic nitrate nitrogen value comparison and variation trend comparison at the tail end of the anoxic tank; and the accurate aeration module reads the real-time numerical value of ammonia nitrogen at the tail end of the aeration tank, performs mean value calculation on the numerical value in each period, performs difference value calculation on the average value of ammonia nitrogen in the current period and the average value of ammonia nitrogen in the last period, and reaches the numerical value of dissolved oxygen through frequency adjustment of an aeration fan to run in a required operation interval. The control method of the low-carbon high-efficiency biochemical system aims to realize low-carbon high-efficiency accurate control of the biochemical system, aeration as required, addition of an external carbon source and control of internal reflux.

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%.

In a cooperative optimal control system, firstly, two-level models are established to capture the dynamic features of different time-scale performance indices. Secondly, a data-driven assisted model based cooperative optimization algorithm is developed to optimize the two-level models, so that the optimal set-points of dissolved oxygen and nitrate nitrogen can be acquired. Thirdly, a predictive control strategy is designed to trace the obtained optimal set-points of dissolved oxygen and nitrate nitrogen. This proposed cooperative optimal control system can effectively deal with the difficulties of formulating the dynamic features and acquiring the optimal set-points.

According to the data-driven adaptive optimization control method for the aeration process of urban sewage treatment, accurate aeration of a plurality of aerobic zones in the aeration process of sewage treatment is controlled, and the aeration energy consumption is reduced while the quality of outlet water is stabilized. According to the invention, a cascade prediction model based on the fuzzy neural network is designed, the dynamic coupling relationship between adjacent aerobic zones is learned, and the nitrate nitrogen concentration in the sewage treatment aeration process, the operation index of each aerobic zone and the future value of the dissolved oxygen concentration are accurately predicted; a self-adaptive optimization controller is designed, and a self-adaptive weight is introduced to dynamically adjust aeration of each aerobic zone so as to coordinate ammonia nitrogen removal requirements and energy consumption optimization of each aerobic zone. Experimental results show that the method can accurately control the aeration of each aerobic zone in the sewage treatment aeration process, improves the effluent quality in the sewage treatment process, and reduces the aeration cost at the same time.

The invention provides a full-spectrum water quality multi-parameter dynamic inversion method and a model construction method thereof, and belongs to the technical field of spectral analysis based on machine learning. By constructing a closed-loop optimization architecture of noise reduction, wavelength optimization, turbidity correction and adaptive modeling, high-precision detection of four water quality parameters of chemical oxygen demand, total organic carbon, total nitrogen and nitrate nitrogen is realized. According to the method, a variational mode decomposition and improved threshold translation invariant wavelet combined noise reduction algorithm is provided, a kurtosis-correlation coefficient dual index is adopted to screen noise components, a multi-translation average strategy is combined to suppress a pseudo-Gibbs phenomenon, and meanwhile, a global parameter collaborative tuning mechanism based on Bayesian optimization is designed; a cross-module hyper-parameter coupling space is established in the whole process of noise reduction, wavelength optimization, turbidity correction and modeling. Through a multi-dimensional feature enhancement mechanism, the model feature representation capability is improved by 35%, and an innovative solution is provided for multi-parameter online detection in a complex water quality scene.

The invention discloses a straw returning water-nitrogen synergistic method based on a biochemical inhibitor, and belongs to the technical field of agricultural resources and environments. The straw returning water-nitrogen synergistic method based on the biochemical inhibitor comprises the following steps that in an annona squamosa-soybean interplanting system, a water-nitrogen synergistic agent is added into an annona squamosa-soybean interplanting system; the nitrogen release and straw decomposition process is regulated and controlled through the synergistic effect of the biochemical inhibitor and water management, short-term crop requirements and long-term soil fertilization are both considered, and the water and nitrogen utilization efficiency is improved. According to the invention, a comprehensive strategy of'regulation and control of nitrogen release by a biochemical inhibitor and collaborative management of water and nitrogen 'is adopted. Release of nitrogen fertilizer is delayed through the urease inhibitor, straw decomposition and crop requirements are matched, and short-term nitrogen starvation of soybeans is avoided; generation of nitrate nitrogen is reduced through the nitrification inhibitor, nitrogen leaching and denitrification loss are reduced, and the nitrogen fertilizer utilization rate is increased; the irrigation amount is adjusted according to the straw decomposition stage and the crop growth stage, microbial decomposition is driven, and meanwhile the carbon conversion efficiency is improved.

The invention discloses a tubular dynamic membrane sulfur autotrophic denitrification device and method, the device comprises: a housing, which is composed of a middle cylindrical structure and two end hemispherical structures, the upper part of the cylindrical structure is provided with a purified water outlet, the lower part is provided with a backwashing port, and the top end of the hemispherical structure is respectively provided with a sewage inlet and a concentrated liquid outlet; the plurality of supporting bodies are arranged in parallel, each supporting body is composed of two layers of honeycomb-shaped PVC grids and a layer of polypropylene net, and the polypropylene net is clamped between the two layers of honeycomb-shaped PVC grids; the two splitter plates are fixed to the two ends of the supporting body respectively, and splitter holes corresponding to the supporting body are formed in the splitter plates; a large-aperture polypropylene net is used as a filtering support body, and powdered sulfur is used as a precoating agent, so that the problems of difficulty in powdered sulfur recovery and serious loss in the traditional sulfur autotrophic process are solved; meanwhile, sulfur powder with a certain particle size is used as a dynamic membrane reactor of a precoating agent, nitrate nitrogen can be efficiently removed, the effluent quality is improved, and meanwhile the dynamic membrane reactor has the advantages of being resistant to pollution and easy to clean.

The invention relates to the technical field of saline-alkali soil improvement, in particular to a compound conditioner for treating sulfate type saline-alkali soil and application of the compound conditioner. The compound conditioner is formed by compounding hydrotalcite, acidic zeolite and humic acid; wherein the hydrotalcite is nitrate intercalated MgAl-LDH or MgFe-LDH, and the molar ratio of divalent metal ions to trivalent metal ions of the hydrotalcite is (2: 1)-(4: 1); the acidic zeolite is clinoptilolite treated by a nitric acid solution; the humic acid is mineral source humic acid, and the purity of the humic acid is greater than 80%. The compound conditioner disclosed by the invention can mineralize Na < + > and SO4 < 2-> which are too high in content in saline-alkali soil, reduce the salt content and pH and prevent plants from osmotic stress and alkaline toxicity; the content of nitrate nitrogen and organic matters in soil is increased, and nutrient substances are provided for plants; the soil structure is improved, the water-retaining property and the air permeability are enhanced, the soil bulk density is reduced, and plant germination and root growth are facilitated.

The invention relates to the technical field of sewage treatment, in particular to a multi-point water inlet intelligent control method and system based on an A-AAO sewage treatment process. The inlet water carbon-nitrogen ratio is input into a feedforward control module, and basic flow distribution weights leading to water inlet pipelines of the pre-anoxic zone, the anaerobic zone and the anoxic zone are generated based on the numerical range of the inlet water carbon-nitrogen ratio; inputting the ORP value of the pre-anoxic zone, the ORP value of the anaerobic zone, the ORP value of the anoxic zone and the effluent nitrate nitrogen concentration parameter into a feedback control module, and generating a correction factor for distributing the weight to the inlet water of each zone and a mixed liquid reflux ratio adjusting instruction; the basic flow distribution weight and the correction factor are fused, and after normalization processing and proportion range constraint are carried out, a final water inlet flow distribution instruction is generated; according to the method, the overall nitrogen and phosphorus removal effect can be improved, the inflow load fluctuation resistance of the system is enhanced, and stable and efficient operation is achieved.

The invention belongs to the technical field of artificial wetland regenerated water treatment, and particularly relates to an enhanced removal method for nitrate nitrogen and organic matters in an artificial wetland regenerated water source. According to the method, glucose, manganese ions and copper ions are added into a regenerated water source, heterotrophic bacteria are enriched in a constructed wetland packed bed, metal ions are loaded in the constructed wetland packed bed, extracellular active enzymes are generated through stress reaction of the heterotrophic bacteria to the metal ions, and then the enzymolysis process of humus organic matters difficult to biodegrade is achieved. The biodegradability of the recycled water is improved, and finally, the removal process of nitrate nitrogen and organic matters is enhanced.

An ecological combined constructed wetland system for rare earth mine tail water treatment is characterized in that a downward vertical flow wetland and an upward vertical flow wetland of a three-stage combined wetland system are communicated through a bottom communicating pipe, and the upward vertical flow wetland and a floating island wetland are communicated through an upper overflow weir; the tail water treated by the sewage adjusting tank sequentially flows through the downward vertical flow wetland, the upward vertical flow wetland and the floating island wetland; each of the downward vertical flow wetland and the upward vertical flow wetland comprises a filler layer with a three-layer structure, and the upper layer is a plant substrate layer and is composed of fine sand or sandy loam; the middle layer is a functional material layer and is composed of hematite, zeolite or activated carbon; the lower layer is a supporting layer and is composed of coarse sand or gravel; and the aquatic plants of the floating island wetland adsorb pollutants in the water body through root systems, and decompose residual pollutants by utilizing the metabolism of the plants. The tail water treatment device can efficiently remove particular pollutants such as ammonia nitrogen, nitrate nitrogen, heavy metals and rare earth elements in the tail water of the rare earth mine.

The denitrification filter tank comprises a tank body and sulfur autotrophic denitrification filler, a blending area and a filler area which are communicated with each other are arranged in the tank body, and the blending area and the filler area are sequentially distributed in the length direction or the width direction of the tank body; the blending area is provided with a water inlet; the filler area is provided with a water outlet; sewage to be treated flows in from the water inlet, sequentially passes through the blending area and the filler area and flows out of the tank body from the water outlet; the sulfur autotrophic denitrification filler is arranged in the filler area and is used for performing sulfur autotrophic denitrification treatment on the flowing sewage. When sewage flows through the sulfur autotrophic denitrification filler, nitrate nitrogen in the sewage is converted into nitrogen through the denitrification effect of sulfur autotrophic denitrification microorganisms and by taking sulfur or reduced sulfide as an electron donor, so that the denitrification treatment of the sewage is realized, the removal efficiency is high, an organic carbon source does not need to be added, and the operation cost is low.

The invention relates to an agricultural non-point source polluted soil nitrate nitrogen in-situ monitoring system and method, and aims to solve the technical problem that accurate in-situ monitoring of soil leaching nitrate nitrogen and a migration rule is difficult to realize. Wherein the soil leaching solution extraction device comprises moisture sensors buried in different soil depths, a leaching solution extraction probe, a solution storage container and a negative pressure source, and the detection device comprises at least two groups of micro-flow pool channels connected in parallel and a photoelectric detection path corresponding to nitrate nitrogen ultraviolet light absorption and non-absorption wavebands; the liquid pumping pipeline is respectively communicated with the liquid storage container and the micro-flow pool channel; the control module receives information collected by the moisture sensor and determines whether to send a negative pressure source starting instruction or not after comparing the information with a set value, a negative pressure cavity is formed in the leaching solution extraction probe, and soil leaching solution collection is achieved. The in-situ monitoring of the leaching nitrate nitrogen can be realized without disturbing the soil structure; the result is continuous, accurate and reliable, and a reliable way is provided for obtaining accurate data information related to agricultural non-point source pollution distribution, migration, development trend and the like.

The invention provides a sewage treatment process adaptive neural network control method with time-varying asymmetric constraints, is used for a sewage treatment process with unknown parameters, and belongs to the technical field of urban sewage treatment process intelligent control. A controller is designed by adopting a self-adaptive control method, and the concentration of dissolved oxygen and the concentration of nitrate nitrogen in the sewage treatment process are accurately controlled. Firstly, due to the fact that the fuzzy neural network has excellent robustness, unknown dynamics appearing in a sewage treatment plant can be effectively approached. Secondly, control input is designed by constructing a time-varying asymmetric obstacle type Lyapunov function, and a fault-tolerant control method is designed in consideration of an actuator fault condition. And finally, performing a simulation experiment by using the reference simulation model 1, and verifying the effectiveness of the proposed method by a simulation result.

The invention discloses a bacterial strain for reducing dissimilatory nitrate into ammonia nitrogen through anaerobic biodegradation of polycyclic aromatic hydrocarbon and application of the bacterial strain, the bacterial strain is named as PheICNA, and the bacterial strain belongs to Intraporum calvum. The strain is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.40686. The strain can degrade polycyclic aromatic hydrocarbons such as phenanthrene under anaerobic conditions and completely metabolize the polycyclic aromatic hydrocarbons into carbon dioxide. Meanwhile, nitrate radicals are reduced into ammonium nitrogen, and the generated ammonium nitrogen can be used for growth of microorganisms and can be used as a nitrogen source for plants. The strain can be used for biologically repairing polycyclic aromatic hydrocarbon pollutants such as phenanthrene in soil, can convert nitrate nitrogen in the soil into ammoniacal nitrogen at the same time, achieves the effect of nitrogen maintenance, and has good application prospects in the aspects of polluted soil treatment and the like.

The invention discloses a sea-land interaction zone underground water pollution source tracing method based on multi-pollutant fingerprints, and the method comprises the steps: constructing a fingerprint feature library of eight key pollutants including cadmium, arsenic, nitrate nitrogen, ammonium nitrogen, phosphate, total petroleum hydrocarbon, sulfamethoxazole, pH value and the like; statistical characteristic models of four pollution sources of industrial emission, agricultural non-point sources, oil exploitation and aquaculture are established, Z-Score standardization and a similarity calculation method based on a standard normal distribution probability density function are adopted, comprehensive similarity evaluation is performed in combination with a risk weight distribution mechanism, a similarity threshold value of 0.7 is set to perform pollution source identification and sorting, and the pollution sources are identified and sorted according to the similarity threshold value. And correction is performed by considering environmental factors such as tide, season and geology of a sea-land interaction zone. The method can quickly and accurately recognize the groundwater pollution source of the sea-land interaction zone, the traceability accuracy rate reaches 80% or above, and scientific and technical support is provided for prevention and control of groundwater pollution of the sea-land interaction zone and formulation of an environmental protection policy.

The invention relates to the technical field of agricultural fertilizers, in particular to an enzymolysis fish protein type amino acid-containing water-soluble fertilizer and a preparation method thereof, the fertilizer is prepared from 50-70% of enzymolysis fish protein stock solution and other components; the stock solution is prepared by pulping aquatic product processing leftovers, adjusting the pH value to 6.5-7.5, adding specific compound protease for enzymolysis, and performing enzyme deactivation and centrifugation; the macroelement liquid contains nitrate nitrogen and ammonium nitrogen (2: 1-4: 1), and the microelement chelating agent is prepared by reacting a stock solution small molecule peptide with a specific salt. The fish protein enzymolysis stock solution is prepared from aquatic product processing leftovers, high-proportion small molecule peptide and amino acid are obtained through specific enzymolysis and other processes, and by matching with high-content macroelements in a specific nitrogen form, nutrition can be rapidly supplemented, and crop photosynthesis and dry matter accumulation can be improved; and moreover, all the components cooperate to regulate the growth of the crops and improve the stress resistance, and the surfactant also improves the utilization rate of the fertilizer and reduces waste.

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 provides a sewage treatment adaptive collaborative optimal tracking control method based on dynamic event triggering. The method comprises the steps of simplified dynamical model construction, Lyapunov function construction, optimal controller construction based on an execution network, evaluation network construction, weight adaptive law construction, dynamic event trigger mechanism setting and tracking control. According to the invention, the parameters of the evaluation network and the execution network are selectively updated through the weight adaptive law, so that the burden of large information communication traffic and insufficient computing power of the water plant is relieved; through an adaptive controller of the execution network, the set values of the dissolved oxygen concentration and the nitrate nitrogen concentration can be accurately tracked, and effective and rapid control is realized; and the execution network and the controller are optimized through the evaluation network, so that the operation energy consumption of the equipment is effectively reduced while the effluent quality is ensured to reach the standard.

The invention provides an astragalus mongholicus residue biochar-loaded microbial inoculant and a preparation method and application thereof.The preparation method comprises the steps that an Enterobacter mori XJ 10 inoculant is cultured firstly, then modified biochar is obtained through high-temperature pyrolysis of astragalus mongholicus residues and modification of industrial brown sugar, the modified biochar and the astragalus mongholicus residues are mixed according to the proportion, oscillated adsorption and vacuum drying are conducted, and the biochar-loaded functional inoculant is obtained. When the Cd-Pb composite contaminated soil is remediated by applying the microbial inoculum and the king grass cooperatively, compared with a contaminated control group (CK-2), the plant height, the stem diameter and the biomass of the king grass are increased by about 119.3%, 116.7% and 53.8% respectively, and the biomass is 9.8% higher than that of original soil (CK-1); ammonium nitrogen, nitrate nitrogen, available phosphorus and quick-acting potassium in the soil are increased by 255%, 892.6%, 203.5% and 301.6% respectively; and the Cd removal rate and the Pb removal rate are respectively increased by about 24.5% and 24.3%. Resource utilization of the radix astragali residues is achieved, a'charcoal-fungicide-king grass' synergistic system breaks through the limitation of a single remediation technology, pollution remediation and soil fertility improvement are both considered, and the method has the advantages of being low in cost, efficient and sustainable.

The utility model relates to the technical field of wastewater treatment, in particular to a sulfur autotrophic denitrification filter tank device driven by a suspended packed bed. The sulfur autotrophic denitrification filter tank device comprises a regulating tank, a sulfur autotrophic denitrification biological filter tank and a sedimentation tank which are communicated in sequence; the adjusting tank is used for homogenizing the wastewater; a suspended sulfur autotrophic denitrification biological filler is arranged in the sulfur autotrophic denitrification biological filter, and the sulfur autotrophic denitrification biological filter is used for performing a sulfur autotrophic denitrification reaction to remove nitrate nitrogen in the wastewater; the sulfur autotrophic denitrification biofilter is also connected with a sulfur autotrophic denitrification dosing tank; the settling pond is used for standing and settling the wastewater; a water outlet for discharging treated wastewater is formed in the top of the sedimentation tank. According to the utility model, the suspended biological filler is combined with the sulfur autotrophic denitrification reagent, and the suspended sulfur autotrophic denitrification biological filler is arranged in the sulfur autotrophic denitrification biological filter, so that the mass transfer efficiency can be improved, and the deep removal of nitrate nitrogen in wastewater is realized.

The invention discloses a nitrogenous fertilizer for cigars, a fertilizer and application. A nitrogenous fertilizer for cigars comprises a nitrate nitrogenous fertilizer and an ammonium nitrogenous fertilizer, and the molar ratio of the nitrate nitrogenous fertilizer to the ammonium nitrogenous fertilizer is (0.66-1.50): 1. The nitrate nitrogen fertilizer is potassium nitrate and / or calcium nitrate, and the ammonium nitrogen fertilizer is ammonium bicarbonate. The molar ratio of the nitrate nitrogen fertilizer to the ammonium nitrogen fertilizer is 1: 1. The invention also provides a fertilizer for cigars. The fertilizer comprises any nitrogen fertilizer for cigars. The fertilizer comprises the following components in parts by weight: 20-60 parts of decomposed oil cake, 20-40 parts of nitrogen fertilizer, 10-30 parts of phosphate fertilizer and 30-60 parts of potash fertilizer. The thoroughly decomposed oil cake is a thoroughly decomposed sesame cake. The nitrogenous fertilizer can improve the soil environment of the tobacco plant root zone, is beneficial to increasing the content of acid phosphatase in the soil, promotes the root development of the tobacco plant, increases the number of effective leaves, and can balance chemical components in cigar leaves.

The invention provides a nitrogen fertilizer application method for reducing nitrogen deficiency of double cropping rice under full straw returning, and belongs to the technical field of biological agriculture. According to the method, the application proportion of the tillering fertilizer is increased under the straw returning condition, the optimal application scheme is obtained, the content of ammoniacal nitrogen and nitrate nitrogen in soil is remarkably increased, the nitrogen contending benefit of soil microorganisms and crops is effectively relieved, and effective tillering formation is promoted. The technical scheme provided by the invention is beneficial to establishment of a rice root system, remarkably promotes absorption and transfer of nitrogen in plants, and improves the number of effective ears of rice, thereby remarkably improving the rice yield.

The present invention relates to a method for assessing the nitrogen interception capacity of rural rivers in plain river networks. To address the unclear nitrogen interception capacity of rural rivers in plain river networks, a river nitrogen cycle model (River-N) was developed that incorporates aquatic plants and biogeochemical cycles. Coupled with the existing EFDC (Effluent Three-Dimensional Hydrodynamic Model) and the NDP (Polder Nitrogen Cycle Model), the model simulates the input, output, migration, and transformation of three forms of nitrogen (particulate nitrogen, ammonia nitrogen, and nitrate nitrogen) in rural rivers, exploring the source-sink balance of nitrogen and quantitatively assessing the nitrogen interception capacity of rural rivers in plain river networks. This method integrates simulation techniques for river network hydrodynamics, biogeochemical cycles, polder hydrology, and nitrogen loss, fully accounting for the unique characteristics of slow flow and widespread aquatic plants in rural rivers in plain river networks. This method addresses the challenge of accurately estimating nitrogen interception in rural rivers in plain river networks, providing technical support for the treatment and management of nitrogen pollution in rural rivers in these regions.

The invention relates to the technical field of fertilizers, and discloses a molybdenum-boron synergistic control type macroelement water-soluble fertilizer, which is prepared from the following raw materials in parts by weight: nitrate nitrogen, ammonium nitrogen, ammonium polyphosphate, potassium oxide, chelated magnesium (MgO), trace elements, a stress-resistant enhancer, a synergistic control agent and a stabilizer, the trace elements are composed of ammonium molybdate, a boric acid-glycerol compound, chelated zinc, chelated manganese (Mn-EDTA) and a chelating agent. According to the molybdenum-boron synergistic control type macroelement water-soluble fertilizer and the preparation process thereof, the ammonium molybdate and the boric acid-glycerol compound are added into the fertilizer, so that the nutrient deficiency symptom can be effectively and synergistically prevented, the fungal disease resistance can be effectively improved by adding the salicylic acid and the nano silicon dioxide, and meanwhile, the effect of preventing and treating the macroelement is achieved. By adding the chlamydomonas rubra enzymolysis extract containing natural abscisic acid, potassium silicate and polyaspartic acid, the high temperature resistance, drought resistance and heavy metal pollution resistance of the fertilizer can be effectively improved, so that the effect of the whole water-soluble fertilizer is improved, and the application range of the water-soluble fertilizer can be widened.

The invention relates to the technical field of environmental microbial resource development and sewage denitrification. The invention discloses an efficient denitrification strain Paracoccus sp.N21 with a flocculation characteristic, which is preserved in the China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.34710. The invention further discloses a preparation method of the efficient denitrification strain Paracoccus sp.N21. The strain obtained by the invention can completely remove ammonia nitrogen within 12 hours and thoroughly remove nitrate nitrogen within 48 hours, the removal rate reaches 100%, and ammonia nitrogen is preferentially degraded in a mixed nitrogen source. The method has the unique advantages that the flocculation rate in the nitrification process and the flocculation rate in the denitrification process exceed 93.9%, and the usage amount of a flocculating agent can be greatly reduced. When actual kitchen wastewater is treated, the ammonia nitrogen removal rate reaches 100%, and the removal rate reaches up to 7.51 mg / (L.h). The application of the strain can effectively reduce the volume of a reactor, reduce energy consumption and operation cost, provides a new solution for simplifying a biological denitrification process, is particularly suitable for treating high-ammonia-nitrogen kitchen wastewater, and has remarkable environmental and economic benefits.

The invention belongs to the technical field of in-situ analysis of water environment interface nutrient elements ammonia nitrogen and nitrate nitrogen, and particularly relates to a zeolite and S110MH mixed adsorption film and a preparation method and application thereof. The zeolite and S110MH mixed adsorption film provided by the invention comprises agar hydrogel and adsorbent particles dispersed in the agar hydrogel, and the adsorbent particles comprise zeolite particles and anion exchange resin particles. The invention provides a preparation method of a zeolite and S110MH mixed adsorption film, functional parameters of the mixed adsorption film and a DGT device installed on the mixed adsorption film, and a testing method of DGT in various environmental media. Experiments show that the DGT device provided with the zeolite and S110MH mixed adsorption film can accurately test the time average concentration or diffusion flux of ammonia nitrogen and nitrate nitrogen at rhizosphere of a water body, sediment or aquatic plants, and reflect the bio-availability, geochemical process and mobility of inorganic nitrogen.

The invention discloses a device and a method for realizing double-short-range coupling anaerobic ammonia oxidation sewage denitrification by combining biologically-enhanced carbon capture with a two-stage membrane aeration bio-membrane reactor. A high-load activated sludge device and an anaerobic fermentation tank are used for carbon source extraction, and a carbon source is provided for a subsequent anoxic tank. The two-stage MABR system adopts a hollow fiber membrane to perform bubble-free membrane aeration, and oxygen is diffused to form an oxygen concentration gradient, so that the surface of the membrane is divided into an oxygen-rich region and an oxygen-poor region. In the aerobic section, the dissolved oxygen gradient of a biological membrane is regulated and controlled to construct a nitrifying bacterium and anaerobic ammonium oxidation bacterium function partition, so that short-cut nitrification coupled anaerobic ammonium oxidation synergistic denitrification is realized; in the anoxic section, nitrate nitrogen and part of ammonia nitrogen are reduced and COD (Chemical Oxygen Demand) is removed through the synergistic effect of short-cut denitrification and anaerobic ammonia oxidation and synchronous nitrification and denitrification on the surface of the membrane. The two-stage MABR synergistic carbon capture device denitrification system constructed by the method realizes efficient and stable deep denitrification, reduces the addition of a carbon source and the yield of sludge, and saves energy consumption.

The present application relates to the field of agricultural environmental protection method, particularly to a method for reducing the pollution of vegetable field soil non-point source and N2O.The method provided by the present application fully considers the carbon and nitrogen content, C / N and cellulose content of different exogenous carbon materials, reduces the application of chemical fertilizer nitrogen under the premise of ensuring the nitrogen supply of vegetables according to the nitrate nitrogen content of vegetable field soil, increases the amount of effective state carbon and the content of holocellulose by optimizing the combination and proportion of different exogenous carbon materials, improves the nitrate nitrogen assimilation of vegetable field soil, reduces the nitrogen leaching and soil N2O emission, and realizes the coordinated reduction and regulation of the pollution of vegetable field soil non-point source and N2O.The method is clear, simple, convenient, easy to implement.