743 results about "Nitrogen phosphorus" patented technology

The invention relates to the technical field of farmland fertilization management, and discloses an intelligent fertilization management method and system based on machine learning. The method comprises the steps that a soil parameter set and an environment parameter set of a target farmland are collected, soil parameters comprise soil humidity, nitrogen phosphorus and potassium content and pH value, and environment parameters comprise illumination intensity, temperature and rainfall; constructing a soil nutrient dynamic change model according to historical data, and predicting a soil nutrient consumption trend in a future preset period; generating an initial fertilization scheme based on the nutrient consumption trend and the crop growth stage characteristics; monitoring the growth state of crops in real time by using a multi-mode sensor, and obtaining a leaf surface color index, a stem height and a fruit development progress to form a growth state data set; and inputting the growth state data set and the initial fertilization scheme into a fertilization decision model, and comparing growth state deviation to adjust the nutrient distribution ratio to generate an optimized fertilization scheme.

The invention discloses a drainage basin nitrogen and phosphorus pollution prediction method based on rainfall runoff migration, and relates to the technical field of water quality pollution prediction, and the method comprises the steps: accurately obtaining land utilization and water body distribution through a remote sensing technology, carrying out the space division of a pollution source through combining a nitrogen and phosphorus load coefficient, and constructing a rainfall runoff model. The runoff volume and time and space distribution under different rainfall events are reflected, and the spatial dynamic change of pollutants is captured through a hydrodynamic model, in combination with a convection diffusion equation and by introducing a conversion model of nitrogen and phosphorus in various forms. By integrating remote sensing data, rainfall runoff simulation, hydrodynamic force and nitrogen and phosphorus form transformation, the space-time migration and transformation process of nitrogen and phosphorus pollution in a drainage basin is described, so that the coupling relation between pollution source distribution and runoff power is revealed, the conveying and diffusion rule of pollutants in a river network is dynamically reflected, and the drainage effect is improved. And refining to transformation evolution of different nitrogen and phosphorus forms, and generating intuitive concentration distribution and thermodynamic diagrams through spatial interpolation.

The invention discloses a potassium fulvate chelated macroelement water-soluble fertilizer with stress resistance and growth promotion functions, and relates to the technical field of water-soluble fertilizers, the potassium fulvate chelated macroelement water-soluble fertilizer comprises the following raw materials by weight: 167-210 parts of mineral source potassium fulvate, 450-460 parts of potassium nitrate, 300-310 parts of urea, 150-160 parts of potassium dihydrogen phosphate, 30-40 parts of potassium sulfate, 15-25 parts of EDTA-disodium, and 5-15 parts of citric acid. 0.5 to 1.5 parts of brassinolide and 4 to 6 parts of polyaspartic acid; according to the potassium fulvate chelated macroelement water-soluble fertilizer with the stress-resistant and growth-promoting functions, through chelation cooperation of potassium fulvate and nitrogen, phosphorus and potassium, the solubility of the chelated phosphorus element in water is increased, and the chelated phosphorus element can be more uniformly distributed in soil; by adopting an EDTA-disodium and citric acid composite chelating system, volatilization and loss of nitrogen elements are reduced, the problem of precipitation of calcium, magnesium and phosphorus is solved, and the soil conditioner is suitable for hard water areas and especially has outstanding performance in saline-alkali soil and arid areas.

The invention discloses an intelligent agricultural planting management method and system, and belongs to the technical field of intelligent agriculture, and the method comprises the steps of data layer construction, water and fertilizer prediction layer construction, planting optimization layer construction and agricultural planting management. The space-time adaptive water and fertilizer prediction layer construction method combining the crop physiological load and the crop growth stage is adopted, the water demand and nitrogen, phosphorus and potassium nutrient demands of crops in the future stage are accurately predicted, the crop growth state and environment changes are dynamically responded, the water and fertilizer demand difference in different growth stages is considered, and the water and fertilizer prediction efficiency is improved. The accuracy and applicability of prediction are improved through time-space fusion, and accurate fertilization can be realized; a planting optimization layer construction method combining digital twinborn and multi-objective optimization is adopted, a water and fertilizer management strategy is subjected to refined and dynamic optimization under the condition of considering a crop growth stage, a soil nutrient condition and a future weather condition, and an optimal management strategy capable of improving the yield, saving water and fertilizer resources and reducing the nitrogen leaching risk is generated.

The invention discloses a system and a method for classified sewage treatment, and belongs to the technical field of environmental engineering and water treatment. The system comprises the following components: an intelligent water quality detection module, which is used for real-time and accurate monitoring of COD, BOD, ammonia nitrogen, total phosphorus, suspended matter concentration and heavy metal content; the sectional bioreactor realizes deep removal of nitrogen and phosphorus and efficient biological treatment by flexibly adjusting reaction conditions of each section; the intelligent flocculation control module is used for automatically and accurately adjusting the adding amount of a flocculating agent, and is combined with integrated operation of efficient inclined tube precipitation and sludge concentration, so that the water quality of discharged water is stable, and the medicament consumption is reduced; the ultrafiltration membrane bioreactor effectively removes residual suspended matters and colloids, and ensures that the effluent stably reaches the standard for a long time through the synergistic effect of catalytic ozonation; and the sludge treatment module is used for realizing collaborative optimization management of sludge reduction, recycling and energy recycling.

The invention relates to a special fertilizer suitable for saline-alkali soil and a preparation method thereof. The fertilizer is granular and has a multi-layer structure which is sequentially arranged from inside to outside: a nutrition core layer, a controlled release film layer, a soil improvement fast exchange layer and a microorganism attaching layer. The nutrition core layer contains nitrogen, phosphorus, potassium and medium trace elements, and meets the basic nutrient requirements of crops; the controlled release film layer is self-assembled layer by layer by adopting alginate / chitosan, a humic acid-ferrous complex and a breakable cross-linking point are inserted into the film, and starch is sprayed on the outer layer, so that an ionic strength / alkalinity dual-response controlled release system is formed; the soil improvement quick exchange layer contains microcrystalline gypsum and ferrous sulfate; the microbial epiphytic layer fixes salt-tolerant phosphate solubilizing bacteria, potassium bacteria and exopolysaccharide-producing bacillus by using a charcoal-zeolite carrier, and the bacteria are distributed on the surfaces of the particles in a dotted manner. The fertilizer realizes organic combination of soil improvement, fertilizer supply and microbial regulation and control, can significantly reduce the soil salinity and alkalinity in a saline-alkali soil environment, and improves the fertilizer utilization rate and the crop growth performance.

The invention discloses a polluted river water nitrogen and phosphorus removal efficiency evaluation system and method based on element analysis, and relates to the technical field of sewage treatment evaluation. An algae growth dynamic model is trained, and the future growth dynamic state of algae is obtained according to future water body data and future environment driving data; the method comprises the following steps: analyzing the interference influence of interference ion concentration on sensor measurement according to future water body data, dynamically simulating the attachment rate and biofilm thickness of algae on the surface of a sensor probe according to future growth of the algae, analyzing the attachment influence of the algae on sensor measurement, and correcting the measurement precision of the sensor according to the interference influence and the attachment influence. According to the corrected sensor data, whether the nitrogen and phosphorus removal efficiency of the polluted river water meets the removal standard or not is evaluated, real-time correction of the sensor data is achieved through interference ion concentration analysis and dynamic simulation of biological adhesion influence, and the accuracy of monitoring data and the scientificity of pollution treatment efficiency evaluation are effectively improved.

The invention discloses a soil in-situ nitrogen, phosphorus and potassium measuring system based on a digital colorimetric method, which comprises a base and an upper computer, and a monitoring box is arranged on the base through a support column; a colorimetric assembly and a data acquisition assembly acting on the colorimetric assembly are arranged in the monitoring box; an energy assembly is arranged on the monitoring box, the data acquisition assembly is electrically connected with the upper computer and the energy assembly, and a water supplementing assembly and an extraction assembly are arranged on the side wall of the monitoring box; the extraction assembly is communicated with the colorimetric assembly; a developing colorimetric method is introduced through the water supplementing assembly, the extracting assembly and the colorimetric assembly, the data collecting assembly is supported through the energy assembly, developing data are collected and transmitted to the upper computer to extract color information, and rapid and accurate determination of nitrogen, phosphorus and potassium in soil can be rapidly achieved without an electrode sensor.

The invention discloses a plain small watershed nitrogen and phosphorus pollutant collaborative source analysis method, which belongs to the technical field of environmental pollution traceability, and comprises the following steps: 1, collecting multi-source basic data in a target plain small watershed, carrying out unified coordinate system, format and precision preprocessing, and constructing a watershed basic database; and 2, constructing a response relation model of various pollution sources and potential pollution loads on a GIS platform based on a drainage basin basic database, qualitatively identifying main pollution sources through spatial visualization analysis, and delineating key risk areas. According to the method, macroscopic spatial analysis, microchemical tracing and mathematical model calculation are organically fused, high-precision spatial data, hydrochemical and isotope analysis, multi-model quantitative analysis and uncertainty quantification are integrated, and high-precision and high-reliability cooperative source analysis of nitrogen and phosphorus pollutants is achieved.

The invention relates to the technical field of wastewater treatment microorganisms, in particular to an efficient compound microbial agent for municipal sewage treatment and application of the efficient compound microbial agent. The compound microbial agent is prepared from the following strains in percentage by mass: 22.5 to 24.3 percent of anaerobic rope bacteria, 10.5 to 13.1 percent of outer bacillus, 6.8 to 7.3 percent of brevibacillus, 3.1 to 4.3 percent of bacillus, 2.3 to 2.5 percent of enterobacter, 1.8 to 2.4 percent of hyphomonas, 2.1 to 2.5 percent of spirillum rot, 1.8 to 2.1 percent of coxiella and 16.8 to 18.2 percent of other bacteria. Aiming at the problems that the existing municipal sewage pollutant removal efficiency is low, and microorganisms are difficult to adapt to water quality fluctuation, the compound microbial agent can adapt to water quality and water quantity fluctuation, and the treatment effect is stable; the COD (Chemical Oxygen Demand) degradation and nitrogen and phosphorus removal capabilities are excellent, and the metabolic capability is strong.

The invention relates to an intelligent soil regulation and control method based on soil data and image processing. The method comprises the following steps: acquiring and standardizing soil data; orchard global multispectral image acquisition: acquiring and preprocessing an orchard image, and acquiring an orchard global multispectral image; vegetation region identification and parameter calculation: calculating NDVI based on red light and near infrared bands, distinguishing green manure and fruit tree regions through a threshold segmentation method, and calculating green manure coverage, a green manure normalized vegetation index and a fruit tree canopy area; carrying out soil-vegetation data fusion and parameter extraction; distributing weights based on the three types of core parameters, calculating the application amount and type ratio of nitrogen, phosphorus and potassium fertilizers, and generating an initial regulation and control scheme; and repeating the steps every specified time period to realize dynamic iterative optimization of the scheme. Through deep fusion of soil data and an image processing technology, intelligent soil regulation and control are realized, regulation and control accuracy and timeliness are remarkably improved, and fertilizer waste and environmental risks are reduced.

A preparation method for high-nitrogen austenitic stainless steel. The high-nitrogen austenitic stainless steel comprises the following chemical components in percentages by weight: carbon: ≤0.02%; silicon: 0.4-0.8%; manganese: 10.2-12.5%; chromium: 24.5-26.5%; nickel: 13.5-16.5%; molybdenum: 3.2-4.8%; nitrogen: 0.75-0.95%; phosphorus: ≤0.03%; sulfur: ≤0.0025%; vanadium: 0.016-0.022%; niobium: 0.026-0.034%; copper: 0.2-0.35%; aluminum: 0.01-0.02%; cerium: 0.015-0.025%; and the balance of iron and inevitable impurities. The preparation method comprises the steps of raw material charging, vacuum melting, refining, nitrogen-added alloying, deoxidation and desulfurization, casting, electroslag remelting, and secondary casting. The preparation is implemented by using the processes of smelting in a pressurized induction furnace and electroslag remelting under a protective atmosphere; and nitrogen is added by using a method in which a nitrogen alloy and pressurized nitrogen permeation are combined.

The invention discloses magnesium modified fecal sludge hydrothermal carbon as well as a preparation method and application thereof, and belongs to the technical field of solid waste treatment in the environmental protection industry. The invention relates to a preparation method of magnesium modified fecal sludge hydrothermal carbon. The preparation method comprises the following steps: uniformly mixing fecal sludge powder and a magnesium additive to obtain a mixture; taking water as a solvent, and adding the mixture for hydrothermal reaction to obtain the magnesium modified fecal sludge hydrothermal carbon. According to the invention, waste utilization is carried out on the excrement sludge, modification is carried out through the magnesium additive, and loss of nutrient substances such as nitrogen, phosphorus and the like is effectively reduced. The magnesium modified fecal sludge hydrothermal carbon is applied to soil, can effectively promote the growth of pakchoi, and has certain agricultural value.

The invention provides a method for recovering nitrogen and phosphorus in wastewater through self-driven bipolar membrane electrodialysis. A system used in the method takes a magnesium negative electrode as a positive electrode and an air electrode as a positive electrode, and a self-driven primary battery is formed through wire connection; and ion exchange membranes with specific sequences are sequentially arranged between the two electrodes to form eight chambers, namely an anode chamber, a nitrogen and phosphorus recovery chamber, a wastewater chamber, a metal ion chamber, an ammonia water chamber, a hydrochloric acid chamber, a buffer chamber and a cathode chamber. During operation, an external power supply is not needed, and ion migration is driven by a self-generated electric field: after Mg < 2 + > and PO4 < 3-> are enriched in the nitrogen and phosphorus recovery chamber and NH4 < + > and Ca < 2 + > migrate to the metal ion chamber, NH4 < + > enters the ammonia water chamber through the monovalent cation exchange membrane, and Ca < 2 + > is separated out and reacts with OH <-> generated by the bipolar membrane to generate Ca (OH) 2 precipitate, so that membrane blockage is effectively prevented, and finally, NH4 < + >, Mg < 2 + > and PO4 < 3-> react to generate high-purity struvite. Zero energy consumption of nitrogen and phosphorus recovery of the wastewater is achieved, no additional chemicals exist, anti-blocking operation is achieved, and both environmental benefits and resource benefits are achieved.

The invention provides a method for preventing and controlling nitrogen and phosphorus loss of sandy and dry cultivated land based on EICP root reinforcement and relates to the field of soil ecological protection and agricultural pollution prevention and control. According to the method, a three-dimensional prevention and control system is formed from the two dimensions of surface layer film covering protection and deep root system soil fixation through the synergistic effect of EICP film covering and local plant root system three-dimensional reinforcement, wind erosion and water erosion are effectively resisted, the soil nitrogen and phosphorus loss rate of the large-gradient sandy and dry cultivated land is remarkably reduced, and meanwhile the soil desertification process is slowed down; the EICP film covering layer has good water permeability and moisture retention, nitrogen and phosphorus loss can be prevented, rainfall infiltration and soil moisture conservation can be guaranteed, and the germination rate and the growth speed of crops are increased; according to the method, local crop root system reinforcement is selected, the original planting structure is not disturbed, the economic benefit of cultivated land yield per mu is guaranteed, a harmless means of combining microorganisms, geotechnical engineering and agricultural planting is adopted, external pollution sources are not introduced, original basic characteristics of soil are not damaged, and the requirement for ecological protection of the Yellow River basin is met.

The invention relates to the technical field of agricultural environment information, and discloses a rice field nitrogen and phosphorus loss amount remote regulation and control method oriented to environment data. The method comprises the following steps: acquiring historical nitrogen and phosphorus loss data, real-time meteorological data and water and fertilizer operation information of the rice field; constructing a mechanism constraint sub-model fusing nitrogen migration and transformation kinetics and phosphorus adsorption and desorption balance; performing multi-source feature extraction on the meteorological data to generate a standardized environment vector; inputting the lightweight residual convolutional neural network to output an initial prediction value; on-line fine adjustment is carried out through a Lagrangian multiplier method in combination with the mechanism model, and a corrected predicted value conforming to substance conservation is generated; and when the predicted value exceeds a threshold value, generating a drainage gate opening degree and fertilization plan adjustment instruction, and issuing the instruction to an edge terminal for execution through the narrowband Internet of Things.

The invention relates to the technical field of organic fertilizer detection, and discloses a method for continuously detecting nitrogen and phosphorus in an organic fertilizer. The method comprises the following steps: acquiring an organic fertilizer sample to be detected, and crushing, homogenizing and filtering the sample through a pretreatment device to obtain a standard detection solution; introducing the standard detection liquid into a trace detection channel, and respectively determining absorbance values of the characteristic wavelength of the nitrogen element and the characteristic wavelength of the phosphorus element by adopting a spectral absorption method; generating an initial detection data set based on the absorbance value, and performing time sequence alignment processing on nitrogen element data and phosphorus element data in the set to form a synchronous detection data sequence; according to the synchronous detection data sequence, a standard curve database is called to match nitrogen and phosphorus concentration conversion parameters in the current detection environment, and a preliminary concentration calculation result is generated; environment temperature and humidity, reagent batches and equipment loss data in the historical detection records are extracted to serve as compensation coefficient input, and corrected nitrogen and phosphorus concentration values are output.

The invention discloses a deep learning-based precise sorghum fertilization amount dynamic adjustment method and system, and relates to the technical field of deep learning-based fertilization amount control. According to soil nutrient concentration and sorghum root physiological index data, a time sequence analysis method is adopted to generate a time sequence change sequence of root absorption capability; and inputting a pre-trained deep learning model to determine a nitrogen-phosphorus-potassium demand difference value. And when the demand difference value exceeds a preset demand threshold value, optimizing a fertilization amount ratio by using a convolutional neural network, simulating a response of a root system to fertilization adjustment in combination with a recurrent neural network, and outputting a target fertilization regulation and control scheme when it is detected that a predicted response accords with an expected yield index, so that equipment is controlled to perform fertilization subsequently according to the target fertilization scheme. According to the method, a nonlinear mapping relation between the fertilization amount and the physiological response of the sorghum root system is established through a deep learning technology, and the fertilization proportion of nitrogen, phosphorus and potassium is dynamically adjusted in combination with time sequence data, so that precise sorghum fertilization amount regulation is realized.

The invention discloses a small watershed nitrogen and phosphorus load accounting method based on key process parameter calibration, and the method comprises the steps: obtaining the basic geographic hydrological data of a target small watershed, the data comprising the areas of different land utilization types in the watershed, the flow length of a water collection region river channel, and the average flow velocity; based on the hydrology and water quality monitoring data of the long-time sequence of the catchment area, adopting a Bayesian inversion model to quantitatively identify the nitrogen and phosphorus output coefficient of each land utilization type; calculating a soil nitrogen and phosphorus output load in the catchment area, determining a natural reduction coefficient of a nitrogen and phosphorus first-order river, and calculating transport time of nitrogen and phosphorus from a starting point of a river channel of the catchment area to a water outlet and transport time of soil output nitrogen and phosphorus from a tributary estuary to the water outlet of the catchment area; and calculating the water collection area outlet nitrogen and phosphorus load. According to the method, the overestimation error caused by the fact that a production and pollution discharge coefficient method is adopted in a traditional method is remarkably reduced through fusion of'pollution source nitrogen and phosphorus entering the river-remaining soil output-along-the-way natural reduction 'ternary accounting, the accuracy of load accounting is improved, the feasibility and advantages of the technical scheme are verified, and the method is particularly suitable for small watersheds with deficient basic data.

The invention discloses a nitrogen-phosphorus intumescent flame retardant based on a hypophosphorous acid derivative and oligomerization Schiff base as well as a preparation method and application thereof, and relates to the technical field of macromolecular flame-retardant materials. The invention discloses a nitrogen-phosphorus intumescent flame retardant based on a hypophosphorous acid derivative and oligomeric Schiff base. The nitrogen-phosphorus intumescent flame retardant has a structure as shown in a general formula (I), wherein the Schiff base chain segment is an oligomerization Schiff base chain segment formed by condensation of aromatic polyamine and aromatic polyaldehyde and has a linear or hyperbranched structure, m, n and x are positive integers larger than 0, m + n is larger than or equal to 2 and smaller than or equal to 8, and x is larger than or equal to 2 and smaller than or equal to 30. According to the flame retardant provided by the invention, an oligomer structure and an introduced benzene ring structure have good compatibility with a polymer matrix and are not easy to migrate and separate out, so that long-acting flame retardance and mechanical properties of a material can be maintained, expensive DOPO is successfully replaced by hypophosphorous acid which is low in cost and easy to obtain, and a solid foundation is laid for large-scale industrial popularization and application.

The invention discloses a preparation method and application of an anti-continuous cropping microbial fertilizer, and aims to solve the problems of aggravation of crop diseases and insect pests and reduction of yield and quality caused by continuous cropping planting. The preparation method comprises the following steps: activating and uniformly mixing bacillus subtilis and bacillus licheniformis, and adding an alpha-lactalbumin solution and a calcium chloride solution to prepare a bacillus aggregate; adding bentonite into the polytrehalose solution, and performing ultrasonic treatment on the mixture and the humic acid solution to prepare a modified polytrehalose-bentonite compound; uniformly mixing acremonium terricola, trichoderma harzianum and a bacillus aggregate, and adding a wall material solution to prepare a compound bacterium microcapsule preparation; and finally, mixing the microcapsules with the corn straw biochar, the chitosan oligosaccharide and the like to obtain a finished product. Through calcium ion induction and humic acid modified embedding, the strain stability and viable count are improved, soil organic matter and nitrogen phosphorus and potassium nutrients can be activated, pathogenic bacteria are inhibited, the crop rhizosphere environment is improved, the growth index and quality of red kidney beans and potatoes are effectively improved, and the method is suitable for continuous cropping resistant planting of crops.

The invention provides an intrinsic flame-retardant epoxy resin composition containing nitrogen and phosphorus elements and a preparation method of the intrinsic flame-retardant epoxy resin composition, and belongs to the technical field of high polymer materials. The intrinsic flame-retardant epoxy resin composition containing nitrogen and phosphorus elements comprises the following components in parts by weight: 1-2 parts of a mixed component C which is obtained by mixing a polyethyleneimine aqueous solution and a phytic acid aqueous solution; 1-16 parts by weight of bisphenol A type epoxy resin; and 0.01-1 part by weight of an anhydride curing agent. According to the composition, two flame-retardant elements, namely nitrogen and phosphorus, are simultaneously introduced into the epoxy resin, so that the mechanical property and the processing adaptability of the material can be considered while efficient flame retardance is realized.

The invention belongs to the technical field of rice cultivation and soil improvement, and particularly relates to a fertilization method for acid rice field soil improvement and application thereof. According to the method, an organic fertilizer is used for replacing 25% of conventional formula fertilizer (formula fertilizer containing nitrogen, phosphorus and potassium), and medium trace elements of magnesium, boron and zinc are applied in a combined manner; or medium trace elements such as magnesium, boron and zinc are additionally applied on the basis of application of a conventional formula fertilizer, and quick lime is added, so that the problem of aggravated soil acidification caused by application of a single chemical fertilizer is relieved, the rice yield is increased, meanwhile, the content of exchangeable acid in soil is reduced, and the total amount of exchangeable salt-based ions in the soil and the effective state content of elements are increased, thereby increasing the pH of the soil and improving the yield of the rice. The acid resistance of the soil is enhanced, and the acid soil is effectively improved.

The present application relates to a kind of high nutrient high activity chemical fertilizer biological compound fertilizer and its preparation and application, belong to agricultural fertilizer technical field.The high nutrient high activity chemical fertilizer biological compound fertilizer of the present application includes inorganic fertilizer and microbial inoculant, the nitrogen phosphorus potassium nutrient content of the chemical fertilizer biological compound fertilizer is greater than 40%, and microbial viable count is above 200 million cfu / g, also includes microbial protective agent, the mass ratio of the microbial protective agent and microbial inoculant is ≥1.The high nutrient high activity chemical fertilizer biological compound fertilizer product of the present application realizes the deep compound of chemical fertilizer and active microorganism, has multiple efficacy of chemical fertilizer and microbial fertilizer, overcomes the neck blocking technical problem that chemical fertilizer and microbial fertilizer are incompatible in production, storage and transportation, use process, significantly improves chemical fertilizer utilization efficiency, reduces fertilizer use cost, solves the problem that microbial fertilizer cannot be generally used in field crops, integrates fertilizer yield and quality improvement, fertile soil and pollution prevention and other functions.

The utility model relates to the technical field of soil detection, and discloses a direct insertion type soil nutrient detector which comprises an upper shell and a lower shell, the upper shell is fixedly connected with the lower shell, and the bottom of the lower shell is fixedly connected with a guide head; the display assembly is mounted on the upper shell; the detection probe is installed in the lower shell, a light emitting diode is fixed to the detection probe and used for emitting near-infrared light with the specific wavelength to soil, the photodiode is used for receiving the near-infrared light reflected by the soil and converting the near-infrared light into an electric signal, and the temperature sensor is used for monitoring the soil temperature in real time; the optical glass is fixedly connected with the detection probe, covers the outer sides of the light emitting diode, the photodiode and the temperature sensor, and is in direct contact with soil; and the mainboard is arranged in the clamping groove of the lower shell. The rapid and accurate detection of the contents of nitrogen, phosphorus, potassium and organic matters in the soil can be realized.

The present invention relates to a fertilizer particle comprising one, two or three of from 1.0 to 30 wt.% of nitrogen (N), from 1,0 to 52 wt.% of phosphorus (P) (expressed as P2O5), from 1,0 to 60,0 wt.% of potassium (K) (expressed as K2O), depending on whether the fertilizer particle is a K, a NP or a PK, or a NPK fertilizer, and from 0.0001 to 5.0 weight% of at least one polysaccharide, more in particular chitosan, as a biostimulant, based on the total weight of the fertilizer particle. The present invention furthermore relates to a method to produce such fertilizer particles.

The invention relates to the technical field of sewage treatment, in particular to a biological enzyme-containing deodorizing and antibacterial composition for sewage treatment. The biological enzyme-containing deodorizing and antibacterial composition for sewage treatment is prepared from the following raw materials in parts by mass: 1 to 3 parts of a compound biological enzyme preparation, 5 to 15 parts of bamboo charcoal powder, 1 to 2 parts of chitosan, 1 to 3 parts of dopamine, 0.005 to 0.024 part of glutaraldehyde, 10 to 30 parts of bentonite, 1 to 5 parts of graphene, 1 to 3 parts of nano silicon dioxide, 10 to 20 parts of wood flour, 5 to 10 parts of sodium hydrogen sulfite and 1 to 5 parts of sodium carboxymethyl cellulose. 1-2 parts of polyacrylamide and 1-5 parts of a nonionic surfactant. The composition disclosed by the invention forms a synergistic effect, can remove most suspended matters and metal ions in sewage, can quickly catalyze and decompose organic matters into water-soluble small molecular compounds such as organic acid and alcohol, efficiently and remarkably reduces the contents of nitrogen and phosphorus in the sewage and purifies a water body.

The application discloses an iron-mediated EGSB type PD / anammox-FePs coupling system and a wastewater treatment method, and belongs to the technical field of wastewater treatment. The iron-mediated EGSB type PD / anammox-FePs coupling system comprises an EGSB reactor and a water inlet system. The water outlet end of the water inlet system is communicated with the bottom of the EGSB reactor. The water inlet system comprises an organic carbon source storage tank, an iron source storage tank, a nitrogen-containing wastewater storage tank, a pump body and pipelines. The organic carbon source storage tank, the iron source storage tank and the nitrogen-containing wastewater storage tank are respectively communicated with the bottom of the EGSB reactor through the pipelines. The pipelines are provided with a reflux pump and a circulating fan to optimize the flow state distribution. The iron mediation improves the nitrogen metabolism intensity and the electron transfer capacity of the system, optimizes the microbial community structure, promotes the formation of high-efficiency mass transfer particles, and then realizes the simultaneous and efficient removal of nitrogen and phosphorus under the condition of low HRT.

The invention provides a low-cost nitrogen and phosphorus removal treatment process for kitchen wastewater, belongs to the technical field of kitchen wastewater treatment, and aims to overcome the defects that an existing nitrogen and phosphorus removal process for kitchen wastewater is long in flow, high in energy consumption, high in cost, unstable in effect and the like. According to the process, a combined process of pretreatment, short-cut nitrification, anaerobic ammonium oxidation and chemical auxiliary phosphorus removal is adopted, modified suspended filler, an anaerobic ammonium oxidation bacteria immobilized carrier and a modified fly ash composite phosphorus removal agent are matched, and intermediate water quality regulation and sludge backflow design is combined. The method realizes efficient and synchronous removal of nitrogen and phosphorus, simplifies the process flow, reduces energy consumption and medicament cost, improves operation stability, adapts to the characteristics of water quality fluctuation of kitchen sewage, and is high in practicability.

This invention discloses an in-situ three-dimensional bioremediation method for slightly polluted water bodies. The method involves collecting a mud-water mixture from the water body to be treated, enriching and culturing it, and collecting the settled sludge. Culture medium II is added to the settled sludge for acclimatization and cultivation to prepare a biological agent. This biological agent is then added to a mixed solution of polyvinyl alcohol-hydrated calcium silicate-fulvic acid (PVA-CSH-FA) or PVA-modified zeolite-FA to prepare an immobilized biological carrier that can slowly release or adsorb calcium ions from the water. Calcium peroxide packing is also prepared to provide oxygen. The immobilized biological carrier packing and calcium peroxide packing are respectively fixed in the upper and lower layers of an ecological sedimentation bed, which is then placed in the slightly polluted water body to achieve in-situ three-dimensional bioremediation. The calcium-precipitating bacterial biological agent obtained through enrichment and acclimatization in this invention, when immobilized and mixed with the carrier material, efficiently and simultaneously removes pollutants such as nitrogen, phosphorus, organic matter, and heavy metals from slightly polluted water bodies.