57 results about "Phosphorus concentration" patented technology

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 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.

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 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 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.

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.

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.

Provided in the present application are a phosphorus adsorption material, and a preparation method therefor and the use thereof. The phosphorus adsorption material comprises a porous composite material, wherein the porous composite material comprises porous biomass carbon and polymer fibers at least partially wound around the porous biomass carbon; and the porous composite material contains several amino groups, at least some of which bind to iron ions. Moreover, the phosphorus adsorption material satisfies the following conditions: 0.36 nm≤d002≤0.43 nm, 0.85≤ID / IG≤1.38, B≥240 m2 / g, and 0.20 cm3 / g≤V≤0.56 cm3 / g, wherein d002 represents the interlayer spacing of graphite-like microcrystallites in the phosphorus adsorption material; B represents the specific surface area of the phosphorus adsorption material; and V represents the total pore volume of the phosphorus adsorption material. The phosphorus adsorption material provided in the present application has a high theoretical adsorption capacity for a phosphorus-containing water body having a high or low phosphorus concentration, and can be regenerated and reused.

To provide a statistical model construction device or the like capable of constructing a statistical model capable of accurately estimating a dephosphorization rate constant even when the blowing treatment is stopped midway.SOLUTION: A statistical model construction device includes a data collection part 331 for collecting operation data on the blowing treatment of a converter 11, and a statistical model construction part 333 for constructing a statistical model using operation data as an explanatory variable and a dephosphorization rate constant in the blowing treatment as an objective variable. The dephosphorization rate constant is defined as a proportionality constant assuming that an amount of change in the phosphorus concentration in molten steel of the converter relative to the cumulative per-unit oxygen supply to the converter is proportional to the phosphorus concentration in the molten steel of the converter. The statistical model construction part constructs the statistical model using operation data on the past blowing treatment collected by the data collection part.SELECTED DRAWING: Figure 1

This invention discloses a method and system for retrieving phosphorus and nitrogen water quality parameters in lakes and reservoirs based on a multi-level attention mechanism. The method includes: acquiring simultaneous monitoring data and phosphorus and nitrogen concentration sample data of the study area, and resampling them to the same geographic resolution to construct a historical sample dataset with the same time series and resolution; performing correlation analysis between phosphorus and nitrogen concentrations using the historical sample dataset, and extracting monitoring data of the associated bands; calculating and constructing an index factor library using the historical sample dataset using an index factor model; acquiring joint band monitoring data extracted from the Sentinel-2 and Landsat 8 satellite sensors of the study area at the same prediction time, and inputting the data from the index factor library into a CNN-Transformer network model, outputting phosphorus and nitrogen concentration prediction results. This invention uses a multi-level attention mechanism with band wavelength factors A and B and related data from the index factor library for multi-scale feature extraction and fusion, improving the prediction accuracy of phosphorus and nitrogen concentrations.

The application discloses a total nitrogen and total phosphorus concentration online monitoring method and system combining spectrum enhancement and closed-loop correction. The method comprises the following steps: synchronously collecting water quality online monitoring data and fluorescence / ultraviolet spectrum data and performing pretreatment; extracting characteristic indexes related to total nitrogen and total phosphorus from the spectrum data; introducing random noise to the enhancement characteristic set of the predefined key area to perform data enhancement, and performing cluster compression on the data of the non-predefined area; training a machine learning prediction model by using the optimized data; regularly obtaining manual monitoring data of a national control section; and finally performing real-time concentration prediction by using the corrected model. The application relates to the technical field of water environment monitoring; the training efficiency and the performance of the key area are balanced through regional optimization processing, the long-term reliability and authority of the model are ensured through the closed-loop correction mechanism of the national control section data, and high-precision, high-robustness and self-evolution total nitrogen and total phosphorus concentration online monitoring is realized.

The application discloses a kind of pond multi-objective optimization management methods for agricultural watershed non-point source pollution regulation, it is related to agricultural watershed non-point source pollution control technical field, for the first time, the multi-dimensional attributes such as pond use type, form feature and sediment nutrient state are integrated into unified quantification framework, by constructing generalized additive model, the nonlinearity and interaction of the influence of pond attribute on river water quality can be accurately captured, the accuracy of river nitrogen and phosphorus concentration prediction is improved. Pond management measures are quantified as controllable decision variables, a multi-objective dynamic optimization model is established to balance environmental benefits and economic benefits, the traditional experience decision is replaced by Pareto optimal solution, a scientific and efficient pond management scheme is proposed, which can be quantitatively implemented, avoiding the one-sidedness of single target, maximizing non-point source pollution reduction while minimizing cost, achieving precise allocation and scientific and quantitative decision of pond management resources.

This invention belongs to the field of wastewater treatment technology, specifically disclosing a composite adsorbent and its preparation method, comprising: mixing ferrous salt and magnesium salt in a container with water in a certain proportion to obtain a first mixed solution; mixing ammonium bicarbonate or sodium bicarbonate in a certain proportion with ferrous salt in a container with water to obtain a second mixed solution; heating the first mixed solution to a first preset temperature; adding the second mixed solution dropwise to the first mixed solution and stirring until completely mixed; allowing it to stand at the first preset temperature to obtain a mixture; and removing the precipitate to obtain the composite adsorbent. It has the following advantages: high purification efficiency, high purification intensity, large adsorption capacity, and excellent purification effect; it can efficiently purify phosphorus in wastewater to reduce the phosphorus concentration in the water.

A phosphorus removal system includes a biofilm tank including a plurality of biofilm carriers having a biofilm disposed on at least a portion of a surface of each biofilm carrier. The system further includes a phosphorus recovery tank configured to receive a recovered phosphorus stream from the biofilm tank. Advantageously, the aqueous effluent stream that results from the system has a phosphorus concentration that is less than a phosphorus concentration of the inlet aqueous streams. Methods of phosphorus removal and recovery are also provided.

The application relates to the technical field of sewage treatment, in particular to a phosphorus removal reagent adding method and system for chemical phosphorus removal in a sewage treatment plant. The method comprises the following steps: collecting operation parameters of the sewage treatment plant in real time; inputting the collected operation parameters into a pre-constructed dynamic physical and chemical model, simulating the dynamic change of a phosphorus removal process, and rollingly predicting a variation trajectory of effluent phosphorus concentration in a future set prediction time domain; the dynamic physical and chemical model comprises a precipitation module, an aging module and an adsorption module; a model predictive control algorithm is adopted to take the minimum phosphorus removal reagent adding amount and the stable and up-to-standard effluent phosphorus concentration in the future set prediction time domain as an optimization target, so as to obtain an optimal phosphorus removal reagent adding amount sequence in the future set prediction time domain. The application can reduce reagent consumption, sludge production and operation cost.

The invention discloses a method for detecting the concentration of available phosphorus in rice tissues, and belongs to the technical field of physiological and biochemical detection of plants. The method comprises the following steps: mixing and homogenizing a rice tissue sample, a grinding liquid and grinding beads, adding a weak acid extracting solution, and extracting under a low-temperature dark condition to obtain a crude extracting solution; adding hydrogel microspheres prepared by a specific method into the crude extract, swelling, centrifuging, and collecting concentrated and purified supernate; diluting the supernate, detecting the absorbance at the wavelength of 820 nm by adopting a molybdenum blue method, and calculating the available phosphorus concentration through a standard curve. Phosphate ions are passively concentrated through the selective water absorption characteristic of the hydrogel microspheres, macromolecular interferents such as pigments and proteins are removed through the size exclusion effect of the network structure of the hydrogel microspheres, and the detection sensitivity and the anti-interference capacity are remarkably improved. The method is simple, convenient and safe to operate, the detection limit reaches 0.015 mg / L, the adding standard recovery rate is 95.00%-105.00%, and the method is suitable for detecting rice samples of different tissue types, phosphorus content levels and indica and japonica rice varieties.

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.

Any one dephosphorization treatment is determined from a plurality of dephosphorization treatments.SOLUTION: Under the condition that the phosphorus concentration in the iron ore after the dephosphorization treatment is reduced to the target phosphorus concentration, a treated ore ratio showing the ratio of the amount of the iron ore to be subjected to the dephosphorization treatment to the total amount of the iron ore is calculated based on the dephosphorization ratio by the dephosphorization treatment. Based on the treated ore ratio, an energy saving amount, which is an energy amount that can be reduced in the iron mill by the dephosphorization treatment, is calculated. On the basis of the total treatment capacity requiring dephosphorization treatment and the treatment capacity of a treatment facility for performing dephosphorization treatment, the required number of treatment facilities which is the total number of treatment facilities for securing the total treatment capacity is calculated. An evaluation index is calculated by dividing the energy saving amount by the required number of bases. Based on the evaluation index calculated in each of the plurality of dephosphorization treatments, any one dephosphorization treatment is determined.SELECTED DRAWING: Figure 1

The invention relates to the technical field of sewage treatment, in particular to a dephosphorization dosing method and device, a storage medium and computer equipment. The method comprises the following steps: acquiring an effluent sample and average effluent flow of a membrane pool unit in the membrane bioreactor sewage treatment system in a detection period, and the temperature of a biochemical pool unit in the membrane bioreactor sewage treatment system; detecting the effluent orthophosphorus concentration of the effluent sample; based on the effluent orthophosphorus concentration and the effluent average flow of the effluent water sample and the temperature of the biochemical pool unit, the adding flow of the phosphorus removal agent solution is calculated; and adding the phosphorus removal agent solution into the membrane bioreactor sewage treatment system according to the adding flow. According to the invention, accurate and automatic addition of a membrane bioreactor process phosphorus removal agent is realized, fluctuation of water quality and water temperature is effectively dealt with, and agent consumption is saved to the greatest extent while effluent is guaranteed to reach the standard.

The invention discloses a method for measuring the total phosphorus content in bovine urine, and relates to the technical field of bovine urine detection.The method comprises the steps that a bovine urine sample is collected; adjusting the pH value of the cattle urine sample, adding a urease solution, inactivating urease after the reaction is completed, and taking supernate as a standard cattle urine sample; preparing a phosphorus standard stock solution, carrying out gradient dilution, and adding an ammonium vanadium molybdate color developing agent to obtain standard working solutions with different concentrations; measuring the absorbance of each standard working solution, and drawing an absorbance-phosphorus concentration standard curve; the method comprises the following steps: putting a standard bovine urine sample into a microwave digestion tank, adding nitric acid and hydrogen peroxide, executing a multi-stage heating program, and performing constant-temperature acid removal treatment to obtain a digestion solution; absorbing the digestion solution, adding an ammonium vanadium molybdate color developing agent, and measuring the absorbance of the digestion solution; and calculating the total phosphorus content in the standard bovine urine sample according to the absorbance-phosphorus concentration standard curve and the absorbance of the digestion solution. The method is simple, convenient, rapid, good in accuracy and suitable for measuring the total phosphorus content in large-batch bovine urine.