98 results about "Phosphorus concentration" patented technology

The invention discloses a pond multi-objective optimization management method oriented to agricultural watershed non-point source pollution regulation and control, and relates to the technical field of agricultural watershed non-point source pollution abatement. Multi-dimensional attributes such as pond application types, morphological characteristics and sediment nutrient states are integrated into a unified quantitative framework for the first time, and a generalized additive model is constructed to obtain a multi-objective optimization model; nonlinearity and interaction of pond attributes on river water quality influence can be accurately captured, and the accuracy of river nitrogen and phosphorus concentration prediction is improved. According to the method, pond management measures are quantified into controllable decision variables, a multi-target dynamic optimization model for balancing environmental benefits and economic benefits is established, a Pareto optimal solution is used for replacing a traditional experience decision, a scientific, efficient and quantitatively-implemented pond management scheme is provided, the one-sidedness of a single target is avoided, and the method is suitable for large-scale popularization and application. The cost minimization is realized while the non-point source pollution reduction is maximized, and the accurate configuration and scientific quantitative decision of pond management resources are realized.

The invention discloses a regulation and control method for preventing nitrogen and phosphorus loss of saline-alkali farmland drainage, and particularly relates to the technical field of agricultural environment protection and water and fertilizer management. Establishing a three-dimensional drainage path initial model, and calculating a drainage easy flow intensity coefficient according to the gradient and sodium saturation joint index of each micro-unit; further monitoring the change rate of nitrogen and phosphorus concentration in different areas through experimental nitrogen and phosphorus tracking irrigation to obtain a nitrogen and phosphorus migration sensitivity parameter; and performing weighted combination on the drainage easy flow intensity coefficient and the nitrogen and phosphorus migration sensitivity parameter, constructing a nitrogen and phosphorus loss risk index, forming a saline-alkali farmland nitrogen and phosphorus loss risk hot area distribution map, taking an area with the identified risk index exceeding a preset threshold value as a target area needing regulation and control, and implementing differential regulation and control measures in the target area to obtain a saline-alkali farmland nitrogen and phosphorus loss risk hot area distribution map. The method can realize accurate identification and dynamic regulation and control of the nitrogen and phosphorus loss of the saline-alkali farmland, improves the utilization efficiency of the fertilizer, reduces the risk of agricultural non-point source pollution, and has relatively strong popularization significance.

The invention belongs to the technical field of salt-tolerant growth-promoting bacteria, and particularly relates to a strain of Priestia aryabhattai PYJ2-8, a microbial inoculum, a preparation method and application of the strain of Priestia aryabhattai PYJ2-8. The invention provides a strain of P.adami PYJ2-8, and the preservation number of the P.adami PYJ2-8 is CGMCC (China General Microbiological Culture Collection Center) No.33769. According to the present invention, the Pristeria aryabhattai PYJ2-8 is the salt-tolerant growth promoting bacterium, can produce IAA, can decompose insoluble phosphorus, can improve the concentration of soluble phosphorus, and can increase the content of available phosphorus in soil; the utilization rate of the fertilizer can be increased, the growth and development and root development of plants can be promoted, and meanwhile, the potential capability of improving saline-alkali soil is also achieved.

The present application belongs to the technical field of sewage treatment, and discloses an energy-saving and consumption-reducing precise dosing control method for urban sewage treatment facilities. The method comprises the following steps: setting a predetermined total phosphorus concentration of the sewage treatment module in the data module as a reference for subsequent dosing control and effluent quality judgment; collecting the inflow flow and the inflow total phosphorus concentration of the sewage treatment module by the data module; determining the detection phosphorus reduction dosing amount of the dosing module according to the predetermined total phosphorus concentration, the inflow flow and the inflow total phosphorus concentration; converting the orthophosphate concentration into the total phosphorus concentration by installing an orthophosphate detection unit at the inflow end of the high-efficiency sedimentation tank and combining the experience coefficient obtained through historical data analysis, so as to calculate the dosing amount; and avoiding the dependence of the traditional system on the expensive and frequently-maintained total phosphorus online detector, thereby significantly reducing the system deployment cost and operation and maintenance difficulty.

The invention discloses a water plant inlet water quality change identification method and system, and the method comprises the steps: collecting water plant inlet water turbidity, pH value, dissolved oxygen content, COD concentration, ammonia nitrogen concentration, total phosphorus concentration and other parameters, removing abnormal values, and constructing a water quality parameter time sequence data set; causal association among parameters is mined through a causal inference-based hybrid model, a weight matrix is generated, after the matrix and time sequence data are fused, bidirectional time features are extracted through a bidirectional long-short-term memory network in combination with an attention mechanism, attention weights are given, and then a gradient elevator integrated model is input; a plurality of base learners are used for parallel learning and dynamic weighted fusion of local results to obtain a preliminary recognition result, and finally the preliminary recognition result is mapped to a water quality change type space to determine a change type. The system comprises six units, a complete and efficient treatment flow is formed from water quality parameter collection to final recognition result output, and the actual requirements of a water plant for high-precision and high-reliability recognition of inflow water quality changes are practically met.

The invention discloses a lake water quality prediction method and system based on a hybrid neural network, and a computer readable storage medium, and belongs to the field of environmental science engineering and deep learning. The method comprises the following steps: screening original water quality data, removing abnormal values, performing linear interpolation, dividing a training set and a test set, decomposing a sequence by using VMD, optimizing VMD parameters by using PSO, reconstructing a new sequence with noise removed, and finally performing prediction by using LSTM-KAN. Through verification of total phosphorus concentration data of four sections of the Dian Lake, comparison with LSTM, VMD-LSTM, VMD-LSTM-KAN and LSTM-KAN models is carried out, and a correlation coefficient (), a mean absolute error (MAE) and a root-mean-square error (RMSE) are selected to evaluate precision. The result shows that the PVLK model has the best performance in single-step and multi-step prediction, the total phosphorus concentration prediction of each section can be kept at 0.75 in 10-step prediction with the step length of 4 hours, the applicability to time sequence data containing abnormal values and high sampling frequency is good, and efficient prediction of lake water quality is effectively promoted.

The invention discloses a rice irrigation area nitrogen and phosphorus reduction process simulation method and system. The method comprises the following steps: respectively calculating irrigation nitrogen and phosphorus concentration and field surface water nitrogen concentration of a current round of a rice irrigation area according to meteorological data, field management data and water quality monitoring data; determining the concentration of pollutants carried by surface runoff and underground leaching load according to the nitrogen concentration of the field surface water; calculating the migration attenuation of the nitrogen and phosphorus concentration in the ditch based on preset ditch parameters and the concentration of pollutants carried by the surface runoff to obtain the ditch outlet concentration; calculating the pond purification concentration based on preset pond parameters and the ditch outlet concentration; and calculating the recharge water phosphorus concentration according to the pond purification concentration and the recharge proportion, and updating the irrigation water phosphorus concentration of the next round in the rice irrigation area according to the recharge water phosphorus concentration to finish the reduction process simulation of nitrogen and phosphorus in the rice irrigation area. The method can be used for quickly and accurately simulating the nitrogen and phosphorus reduction process and discharge load of each part of the paddy irrigation area from field to ditch to pond.

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 provides a Z-type heterojunction material for synchronously removing phosphorus and tetracycline in sewage. The material is composed of a hexagonal flaky nano magnesium-aluminum-iron hydrotalcite matrix with the size of 30-100 nm and a metal oxide growing on the surface. The preparation method of the material comprises the following steps: carrying out hydrothermal treatment on magnesium-aluminum-iron hydrotalcite and trimesic acid in N-N dimethylformamide liquid, growing a metal organic framework compound on the surface of the magnesium-aluminum-iron hydrotalcite in situ through dissolved-out metal ions and trimesic acid, and roasting the metal organic framework compound to obtain the Z-type heterojunction material. The Z-type heterojunction material can synchronously and efficiently remove phosphorus and tetracycline in sewage, the synchronous removal rates of 50 mg of the material to phosphorus and tetracycline are 97.60% and 95.47% respectively in 100 mL of a phosphorus (concentration of 25 mg / L) water sample and a tetracycline (concentration of 50 mg / L) water sample, and the synchronous removal rates of phosphorus and tetracycline are still 87.62% and 85.57% after continuous circulation for five times. The Z-type heterojunction material can be applied to the aspect of phosphorus and tetracycline mixed sewage treatment in the breeding industry.

The invention discloses a wetland ecological restoration method combined with water ecological restoration monitoring, and relates to the technical field of ecological restoration. The method comprises the following steps: acquiring water depths, nitrogen and phosphorus concentrations, dissolved oxygen and biodiversity indexes of a deep water area, a shallow water area and a coastal zone of a wetland through a sensor network, and generating an initial data set; dividing a wetland region by adopting a K-means clustering algorithm, and constructing a classification region feature model; based on the nitrogen and phosphorus concentration and the water depth of each region, configuring plant species, simulating a water flow gallery and optimizing the pollutant removal efficiency; integrating coastal zone data, optimizing the external pollution interception efficiency by using a genetic algorithm, and obtaining an optimal matching parameter; generating a collaborative ecological restoration framework by iteratively adjusting plant parameters, and establishing a comprehensive numerical evaluation model; and a management data set is generated according to an evaluation result, and quantitative optimization of the wetland ecological restoration effect is realized. According to the method, the pollutant removal efficiency can be effectively improved, and collaborative recovery of ecological functions can be ensured.

The invention relates to the technical field of sewage treatment plant chemical phosphorus removal agent accurate adding scheme design, in particular to a sewage treatment plant chemical phosphorus removal agent accurate adding method and system and electronic equipment. Phosphorus concentration, flow and COD data are collected in real time through an online sensor, and preprocessing is conducted through sliding window anomaly detection and data interpolation. And the LSTM network and sliding time window online learning are combined to dynamically predict the phosphorus load within 5-30 minutes, and the error is less than or equal to + / -10%. Based on an enhanced constrained PSO algorithm, the dosage is dynamically optimized, and meanwhile, NSGA-II multi-objective optimization is coupled, so that the medicament cost and carbon emission are balanced. Incremental PID feedback control is introduced, the adding deviation is smaller than or equal to 0.1 mg / L, and the influence of key variables on decision making is strengthened through a dynamic weight adjusting mechanism. The system supports cloud-side cooperation, the response time is less than or equal to 5 minutes, the system is suitable for different scales of treatment plants, and the operation cost is greatly reduced while the effluent is ensured to reach the standard.

This application discloses a real-time control method, device, equipment, and medium for micro-nano air flotation phosphorus removal based on a neural network model, relating to the field of computer technology. It includes: real-time acquisition of operational data through a preset sensor network, and preprocessing the operational data to obtain target data; generating a recommended PAC dosage value based on influent phosphorus concentration, water turbidity, and historical phosphorus removal rate using a first preset neural network model, and dynamically correcting the recommended PAC dosage value based on potential data using a second preset neural network model to obtain the target PAC dosage; optimizing the dissolved air pressure based on the target PAC dosage, influent phosphorus concentration, water turbidity, historical phosphorus removal rate, and post-coagulation parameters using a third preset neural network model to achieve real-time control of micro-nano air flotation phosphorus removal. This enables real-time, adaptive, and intelligent optimization and control of operating parameters during the micro-nano air flotation phosphorus removal process.

The application discloses a method and a device for monitoring effluent orthophosphate concentration and resisting analyzer deviation, and relates to the technical field of sewage treatment. In the method, the monitoring device firstly constructs a state space vector according to operation parameters in a sewage phosphorus removal process, and then constructs a dynamic Markov random field model by taking a true value of effluent orthophosphate concentration as a hidden state variable and the state space vector as an observation variable. After predicting a prior probability distribution based on the model and a historical sequence, when the measurement value of the analyzer is lower than a precision threshold value, the prior probability distribution and the observation value are fused by using a Kalman filtering algorithm to obtain a calibrated concentration value and output the calibrated concentration value to a control system to guide reagent adjustment. In this way, the accuracy and reliability of detection of the effluent orthophosphate concentration are improved when the orthophosphate concentration in the effluent water sample is extremely low.

The invention discloses a pixel scale water environment safety assessment method based on a non-point source water body pollution risk, and belongs to the technical field of environmental protection. According to the method, through an agricultural non-point source pollution direct evaluation method, the pollution risk of terrestrial agricultural non-point source output to surface water is accurately quantified, a DPeRS model is introduced, quantitative evaluation of the remote sensing pixel scale agricultural non-point source river entering amount is achieved, and the pixel scale agricultural non-point source river entering concentration is quantified as a non-point source pollution risk evaluation index in combination with an SWAT model. With surface water environment quality improvement as a target, an agricultural non-point source pollution in-water risk grade threshold value is determined based on a nitrogen and phosphorus concentration limit value in a surface water environment quality standard and a national secondary pollution general survey agricultural non-point source proportion, and a pixel scale agricultural non-point source in-water pollution risk prominent area is rapidly screened. High-precision target positioning of remote sensing pixel scale agricultural non-point source pollution is realized, and source-targeted agricultural non-point source pollution precise prevention and control and agricultural non-point source pollution treatment effect evaluation are facilitated.

The invention relates to the technical field of sewage treatment, in particular to a method for recovering phosphorus resources in excess sludge concentrated clear liquid in situ, which comprises the following steps: additionally arranging a reaction sedimentation tank at the front end of a sewage treatment biological system, introducing excess sludge concentrated clear liquid and part of sewage, and monitoring the flow of the sludge clear liquid, the phosphorus concentration and the ammonia nitrogen concentration in the sewage in real time. The sewage diversion flow and the magnesium liquid adding amount are automatically adjusted, the alkaline environment is regulated and controlled to promote struvite to crystallize and precipitate, and efficient phosphorus recovery is achieved. According to the method, automatic control and chemical precipitation principles are combined, only the existing process needs to be locally modified, the operation cost is low, the occupied area is small, the phosphorus recovery rate exceeds 99%, the generated struvite can be directly used as a phosphate fertilizer, the remarkable economic value is achieved, and meanwhile stable operation of a follow-up biological treatment unit is guaranteed.

The lubricant composition may provide corrosion resistance, oxidation resistance, and reduced wear to the hydraulic system. A lubricant composition can include an ashless dithiophosphate ester in an amount sufficient to provide the lubricant composition with a phosphorus concentration in the range of from 10 ppm to 250 ppm, a metal dialkyldithiophosphate salt, such as zinc dialkyldithiophosphate (ZDDP), in an amount sufficient to provide the lubricant composition with a phosphorus concentration in the range of from 50 ppm to 1000 ppm, a corrosion inhibitor comprising an alkyl triazole derivative in an amount sufficient to provide the lubricant composition with a nitrogen concentration in the range of from 0.75 ppm to 100 ppm; and a major amount of a base oil.

The present application relates to the technical field of forest seedling and intelligent agriculture, and specifically discloses an intelligent monitoring and nutrient regulation system for sprouting seedlings of fragrant fruit trees, which calculates the red edge position blue shift deviation by collecting the multispectral image of the crown layer of the sprouting seedlings to identify the phosphorus deficiency phenotype; determines the spatial phosphorus deficiency and obtains the root zone reference conductance value by combining the root zone and surface layer phosphorus concentration spatial comparison detection; determines the irrigation interval according to the difference between the reference conductance value and the critical value of fertilizer damage, and precisely applies high-phosphorus water-soluble fertilizer by using pressure-compensating drippers with low flow; after irrigation, the irrigation time is dynamically shortened and the target conductance value is reduced according to the root zone conductance rise amplitude, and after continuous execution for three days, the irrigation is terminated when the blue shift deviation and the color of the newly grown leaves both meet the recovery conditions; the present application realizes early identification and closed-loop feedback regulation of the spatial phosphorus deficiency of the sprouting seedlings of fragrant fruit trees, avoids fertilizer damage and root rot, and improves the accuracy and safety of nutrient regulation.

Lubricant compositions may provide corrosion resistance, oxidation resistance, and reduced wear for hydraulic systems. A lubricant composition may comprise an ashless dithiophosphate in an amount sufficient to provide a concentration of phosphorus ranging from 10 ppm to 250 ppm to the lubricant composition, a metal dialkyl dithiophosphate such as zinc dialkyl dithiophosphate (ZDDP) in an amount sufficient to provide a concentration of phosphorus ranging from 50 ppm to 1000 ppm to the lubricant composition, a corrosion inhibitor comprising an alkyltriazole derivative in an amount sufficient to provide a concentration of nitrogen ranging from 0.75 ppm to 100 ppm to the lubricant composition, and a major amount of a base oil.

The invention provides a method for quantitatively identifying contribution of multi-source phosphorus pollution, relates to the field of water environment management, and aims to accurately analyze sources of multi-source phosphorus pollution of river and lake water bodies. The method comprises the following steps: firstly, determining the pollution source type of a research area, collecting river and lake water and pollution source water samples, synchronously retaining subsamples, determining the phosphorus form concentration, and establishing an associated ledger; then measuring a three-dimensional fluorescence EEM spectrum of a water sample, preprocessing the three-dimensional fluorescence EEM spectrum, extracting a fluorescence component by using a PARAFAC model, calculating a Fmax value, constructing fluorescence component-Fmax-phosphorus concentration associated data, optimizing a projection direction through an immune genetic algorithm, constructing a projection pursuit regression model, and supplementing phosphorus pollution associated characteristic values to form two-dimensional correction data; and finally, inputting correction data by using a MixSIAR model, operating MCMC to simulate and estimate a pollution source contribution proportion, verifying model convergence, and analyzing and visualizing sample point pollution contribution and spatial distribution characteristics. According to the method, the phosphorus pollution traceability accuracy and reliability are improved, a scientific basis is provided for water environment treatment, and drainage basin management and ecological civilization construction are assisted.

The invention discloses an iron / calcium modified chlorella biochar material for removing phosphorus from mariculture tail water, which comprises chlorella biomass powder, a Fe source, a Ca source and polyethylene glycol 4000, and nitrogen is used as a protective gas in the preparation process. The catalyst is prepared through the steps of chlorella biomass pretreatment, Fe / Ca impregnation liquid preparation, biomass impregnation and pretreatment, anaerobic pyrolysis and the like, the porous structure and the positive electricity surface of the catalyst can strengthen phosphorus adsorption, and phosphorus is removed through the synergistic effect of electrostatic adsorption, ligand exchange, chemical precipitation and physical interception; when the pH value is 3-11 and the salinity is 5-40 per thousand, the phosphorus removal efficiency is high. When in use, the phosphorus removal rate of the tail water reaches 93% or above, the tail water tends to be saturated within 4 hours, the phosphorus concentration of the treated tail water can meet the first-grade discharge standard of 0.5 mg / L or below, meanwhile, resource utilization of the chlorella breeding waste is achieved, additional transfer treatment materials are not needed, and the operation cost and time are saved.

The invention discloses a parameter adjusting method for preparing an iron phosphate precursor material with a stable iron-phosphorus ratio, and belongs to the technical field of battery recycling, and the parameter adjusting method for preparing the iron phosphate precursor material with the stable iron-phosphorus ratio specifically comprises the following steps: supplementing phosphorus by adopting an iteration method, and designing an experimental scheme of phosphorus concentration in different iron precipitation mother liquor, so as to obtain the iron phosphate precursor material with the stable iron-phosphorus ratio. The phosphorus concentration in the iron precipitation mother liquor is compared with the set phosphorus concentration in the iron precipitation mother liquor, the phosphorus concentration is adjusted, and compatible phosphorus supplementation with different iron concentrations is achieved; the subsequent process comprises hydrogen peroxide oxidation and sodium hydroxide pH adjustment in the synthesis stage, and finally the iron phosphate precursor with the stable iron-phosphorus ratio is obtained through the steps of drying and calcining. According to the method, the phosphorus content can be accurately regulated and controlled, the problem that the phosphorus supplementing amount is too small or too high is solved, the product purity and quality are improved, impurity generation is reduced, the crystal structure is optimized, the process adaptability and stability are improved, the parameter adjusting method is suitable for aluminum removal liquid with different iron concentrations, the production cost is further reduced, and resource waste is avoided.

This invention discloses a cultivation method for increasing the starch content of duckweed, relating to the field of plant culture technology, comprising the following steps: taking pig farm biogas slurry, adjusting ammonia nitrogen to 10 mg / L~20 mg / L, total phosphorus to 0.1 mg / L~2.0 mg / L, and pH to 5.0~6.0, then inoculating initial duckweed into it and culturing for 5~7 days to obtain acclimatized duckweed; taking pig farm biogas slurry, adjusting ammonia nitrogen to 40~50 mg / L, total phosphorus to 0.4 mg / L~5.0 mg / L, and pH to 5.0~6.0, then adding sodium pyrophosphate and Bacillus amyloliquefaciens, then inoculating the acclimatized duckweed into it and culturing for 2~3 days to obtain high-starch duckweed. This invention constructs a two-step cultivation system of acclimatization and stress through culture solutions with differentiated nitrogen and phosphorus concentrations, and with the synergistic effect of sodium pyrophosphate and Bacillus amyloliquefaciens, achieves efficient and stable accumulation of duckweed starch.

A method and apparatus for treating hydrogen reduced DRI comprising phosphorus in an induction furnace is disclosed. The method comprises treating the molten DRI by at least partially distributing phosphorus in the DRI into the slag, where the molten DRI becomes an iron feedstock that is at least substantially alpha iron and has a lower phosphorus concentration, typically 0.03% or less by weight, and where the iron feedstock is at least substantially alpha iron and has a lower phosphorus concentration, typically 0.03% or less by weight. The iron feedstock is suitable for use as a direct feed material for manufacturing steel, for example in existing steelmaking equipment such as EAF.

A method for producing a phosphorus-doped silicon single crystal, which comprises pulling the phosphorus-doped silicon single crystal from a phosphorus-doped silicon melt by the magnetic field applying Czochralski (MCZ) method, wherein the phosphorus is doped in such a way that a phosphorus concentration of the phosphorus-doped silicon single crystal is 2×10 16 atoms / cm 3 or more, and a horizontal magnetic field with a central magnetic field strength of 0.2 Tesla (2,000 Gauss) or more is applied to the silicon melt, wherein the measures for controlling the uptake of oxygen into the phosphorus-doped silicon single crystal include controlling the rotation of the crystal axis, the single crystal growth rate, the flow rate of an inert gas, the furnace pressure, or the design of the heating chamber structure so that, during the production of the phosphorus-doped silicon single crystal, the oxygen concentration is adjusted to a value of 1.6×10 18 atoms / cm 3 (ASTM'79) or above over the entire length of the entire body of the single crystal.

The present application relates to the technical field of livestock and poultry wastewater treatment, and specifically provides a low-temperature-resistant microchaete aeruginosum and application thereof.The present application screens the microchaete aeruginosum which is low-temperature-resistant and has high nitrogen and phosphorus concentration tolerance, and the preservation number is CGMCC No.40696.The microchaete aeruginosum with the preservation number CGMCC No.40696 provided by the present application can realize the microbial treatment of high-ammonia-nitrogen and high-phosphorus pig manure slurry in cold regions, reduce the pressure of livestock and poultry wastewater treatment and resourceization in high-cold regions, and reduce the degree of water eutrophication.

The application belongs to the technical field of sludge gasification residue recycling, and particularly relates to a process for recycling aluminum phosphate from sludge gasification residue, aiming to solve the problem of difficult efficient and clean recycling of phosphorus and aluminum resources in sludge gasification residue. The process comprises: mechanically crushing the sludge gasification residue to increase the specific surface area; using waste acid for wet acid leaching to dissolve phosphorus, aluminum and iron elements; after solid-liquid separation and dilution to adjust pH, using strong acid cation exchange resin to remove heavy metal ions, realizing efficient separation of phosphorus and impurities; taking the phosphorus concentration in the purified acid leaching solution as the benchmark, under the conditions of accurate control of pH, temperature and aluminum-phosphorus molar ratio, reaction to generate aluminum phosphate precipitate; and then through aging, solid-liquid separation, washing, drying and crushing, high-purity aluminum phosphate product is obtained. The application avoids phosphorus loss through waste acid cooperation with acid leaching and resin deep impurity removal, significantly improves the phosphorus leaching rate and product purity, the process flow is compact and can be continuously operated, and has economic and environmental benefits.

The invention discloses a high-flux soil biological available phosphorus rapid extraction device which comprises an extracting agent conveying unit, a reaction bottle, a detection pool and a detection unit, the high-flux soil biological available phosphorus rapid extraction device is provided with an extracting agent inlet and a filtrate outlet, the extracting agent inlet is connected with an extracting agent conveying pipeline to receive an extracting agent, and an ultrasonic bar is arranged in the reaction bottle; the filter is connected with the filtrate outlet of the reaction bottle to receive the filtrate subjected to ultrasonic oscillation, and is arranged in the detection pool. The extraction agent conveying unit is arranged to continuously supply the extraction agent into the reaction bottle, and the detection unit is used for monitoring the change rate of the phosphorus concentration of the filtrate in real time, so that when the phosphorus content of the sample is high, the system continuously supplements the extraction agent until the change rate of the concentration is lower than a threshold value, and the high-phosphorus sample is completely extracted; when the phosphorus content of the sample is low, the system can stop extraction when the concentration change rate reaches a threshold value, excessive use of an extracting agent is avoided, and reagent consumption is remarkably reduced.

A method for phosphorus removal and recovery using an organic carbon source of urban sewage, including: first filling a biofilm reactor with sewage; stirring under anaerobic conditions, phosphorus being released from a polyphosphate biofilm using an organic carbon source in the sewage; discharging a portion of the sewage after the aforementioned treatment into a recovery tank and storing same as a recovery liquid; performing aerobic aeration on the remaining part of the sewage after anaerobic treatment, such that phosphorus is absorbed by the polyphosphate biofilm until the concentration of phosphorus reaches a requirement for discharge; turning off the aeration device and discharging the sewage; returning the recovery liquid to the biofilm reactor, simultaneously adding sewage to fill the reactor, and repeating the aforementioned steps multiple times; and obtaining a phosphorus recovery liquid when the concentration of phosphorus in the recovery liquid reaches the requirements for a phosphorus recovery process.

The application discloses a kind of methods for preventing saline-alkali farmland drainage nitrogen and phosphorus loss, specifically related to the technical field of agricultural environmental protection and water and fertilizer management;Establish a three-dimensional drainage path initial model, according to the slope and sodium saturation of each micro-unit joint index, calculate the drainage easy flow intensity coefficient;Further through experimental nitrogen and phosphorus tracking irrigation, monitor the nitrogen and phosphorus concentration change rate in different regions, obtain nitrogen and phosphorus migration sensitivity parameters;Then the drainage easy flow intensity coefficient and nitrogen and phosphorus migration sensitivity parameters are combined, the nitrogen and phosphorus loss risk index is constructed, and the nitrogen and phosphorus loss risk hot zone distribution map of saline-alkali farmland is formed, the area with risk index exceeding the preset threshold is identified as the target area needing regulation, and differential regulation measures are implemented in the target area, the application can realize the accurate identification and dynamic regulation of nitrogen and phosphorus loss in saline-alkali farmland, improve the fertilizer utilization efficiency, reduce the risk of agricultural non-point source pollution, and has strong popularization significance.

The invention belongs to the field of analytical chemistry, and particularly relates to a method for analyzing a phosphate detection sample in food, especially aquatic products. The method realizes high-efficiency detection of phosphate through combination of water extraction and XRF, and comprises the following steps: sample preparation and extraction: unfreezing a frozen aquatic product, then carrying out high-speed crushing at a speed of 22000 r / min, carrying out vortex mixing on an aqueous solution, carrying out ultrasonic extraction for 3-15 min, carrying out centrifugal treatment at a speed of 8000 r / min, and taking a supernatant; establishing a matrix labeling standard curve: adding a sodium phosphate standard substance (0-529.14 mg) into the sample, extracting to obtain a standard working solution with the phosphorus content of 600-20600 mg / kg, and establishing the matrix labeling standard curve by using XRF (X-Ray Fluorescence) intensity and phosphorus concentration; and XRF analysis: detecting the sample for 5 minutes under the conditions that the tube pressure is 10 kV, the tube flow is 100 [mu] A and the analysis spectral line is K alpha (2.010 keV), and calculating the phosphorus content according to the curve. Compared with traditional detection, detection can be completed only in 15 min based on XRF, and the speed is increased by 16-40 times. The pretreatment only needs water extraction, chemical reagents are avoided, the accuracy is remarkably improved by using a matrix standard curve, and the method is suitable for quality monitoring of frozen aquatic products.