330 results about "Phosphorus concentration" patented technology

An ytterbium-doped optical fiber of the present invention includes: a core which contains ytterbium, aluminum, and phosphorus and does not contain germanium; and a cladding which surrounds this core. The ytterbium concentration in the core in terms of ytterbium oxide is 0.09 to 0.68 mole percent. The molar ratio between the phosphorus concentration in the core in terms of diphosphorus pentoxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 30. The molar ratio between the aluminum concentration in the core in terms of aluminum oxide and the above ytterbium concentration in terms of ytterbium oxide is 3 to 32. The molar ratio between the above aluminum concentration in terms of aluminum oxide and the above phosphorus concentration in terms of diphosphorus pentoxide is 1 to 2.5.

The invention discloses a reproducible phosphorus-uptake ceramsite and a preparation method thereof. The technical scheme provided by the invention comprises the following steps of: respectively drying 70-85 wt% of fly ash, 10-16 wt% of pore-forming agent and 5-14 wt% of clay powder and uniformly mixing the raw materials; after balling the mixture, baking at a temperature in a range of 950-1100 DEG C for 30-50 min to obtain a baked porous ceramsite; sequentially immersing the baked porous ceramsite with HCl, washing with water and drying; and loading zirconium oxide hydrate to obtain the phosphorus-uptake ceramsite. The phosphorus-uptake ceramsite prepared by the invention can be directly added into or filled as a filtering column to remove phosphorus in the water and the adsorbed phosphorus-uptake ceramsite can be desorbed by a NaOH solution to be reproduced; the saturated adsorption capacity to the phosphorus is 10-11 mg / g and the adaptability to the change of the phosphorus concentration in the water is good; after the treatment, the solid-liquid separation is easy to realize and the water quality of the discharged water is better. The reproducible phosphorus-uptake ceramsite provided by the invention has the advantages of strong phosphorus-uptake capability, easiness of realizing the solid-liquid separation, good cyclic usability and higher cost performance, so that the reproducible phosphorus-uptake ceramsite is applicable to phosphorous removal of various types of wastewater and surface water.

An apparatus and method for detecting phosphorus in soil and vegetation are developed. In one embodiment, a portable Raman-based sensor is provided to obtain significant phosphorus absorption band in soils and to determine phosphorus concentrations. The portable sensor can have the capability to measure phosphorus concentrations in wet and dry soil samples as well as fresh and dry vegetations. In one embodiment, the portable sensor of the invention uses a 600 mW laser light source at 785 nm with a full width at half maximum of about 0.2 nm and a spectrometer that covers 340 and 3640 cm−1. Software, written in Visual C++, and partial least squares analysis were used to produce calibration and predictions models.

The invention discloses a device and a method for coupling producing biological oil by utilizing microalgae to deeply treating wastewater, which belongs to the technical field of water pollution control. The device is arranged after secondary wastewater treatment, and nutrient elements of nitrogen, phosphorus and the like can be absorbed by the photosynthesis of algae cells, and thus, the nitrogen and phosphorus concentration in secondary wastewater treatment effluent can be further reduced, thereby lowering the risk of water bloom eruption because the sewage plant effluent is discharged behind scenic water; the device can be applied to the deep treatment of the wastewater. The growth rate of the algae cells and the nitrogen and phosphorus removal rate can be increased by taking Scenedesmus sp.LX1 as a nitrogen and phosphorus removal dominant algae by adopting an LED red and blue light source; and the algae density in a reactor and the nitrogen and phosphorus removal can be increased by adopting a membrane separation mode and a dense algae liquid reflux mode. Meanwhile, grease can be further extracted by separating the obtained dense algae liquid, and the wastewater is taken as the resource to produce the biological oil. The method has the advantages of good nitrogen and phosphorus removal effect, high economic benefit and the like.

The invention discloses a composite microbial agent and a preparation method and application thereof. The composite microbial agent includes a pseudomonas preparation, an acinetobacter preparation, a bacillus amyloliquefaciens preparation, a bacillus subtillis preparation, a bacillus licheniformis preparation, a pediococcus acidilactici preparation, a rhodobacter sphaeroides preparation, an alkali-lake dietzia preparation and a rhodopseudomonas palustris preparation. The preparation method includes the following steps that 1, composite microbial agent components are prepared; 2, the composite microbial agent components are mixed in proportion to obtain the composite microbial agent. The composite microbial agent can simultaneously decompose different organic matter, degrade amino nitrogen and nitro nitrogen in water, reduce phosphorus concentration in the water body and inhibit the growth of algae. The composite microbial agent is used for urban-rural sewage in-situ remediation, has the advantages of being high in efficiency, quick to take effect, free of no secondary pollution, simple in operation and the like, and large-scale application and popularization are facilitated.

This invention belongs to new style green technology region, concretely relates to a method of using sludge organic matter to advance biologic dephosphorization effect of sewage. Excess sludge at basicity condition is carried out anaerobic fermentation to produce organic acid; adopt guano precipitation means to reclaim nitrogen and phosphorus of organic acid; add the treatment fluid after reclaiming nitrogen and phosphorus to municipal sewage, under anaerobic-aerobic condition aerobic conditito carry out biological sewage treatment,through solid-liquid separation, the out water reaches the mark and is discharged. This invention through the method of adding excess sludge broth to sewage, not only advance the ability of microbe of synthesizing poly- hydroxy valeric acid(PHV)under anaerobic condition, advance availability of poly- hydroxy eicosanoic acid, decrease glycogen metabolization quantity, in favor of maintaining higher dephosphorization effect at aerobic condition, reduce phosphorus concentration in the out water, prevent water substance eutrophication occurring, but also decrease sludge volume, thereby decrease sludge treatment cost and pollute to environmental.

The invention relates to an ammonian remover used for treating highly concentrated ammonian wastewater and a treatment method, belonging to the technical field of wastewater treatment. The ammonian remover is prepared in such a way that magnesium salts and phosphates are added into the ammonian wastewater with set quantity according to a rule of Mg:NH4:PO4=1.4-1.6:1:1.4-1.6 for reaction to generate precipitate, the precipitate is decompounded in an MAP decomposition chamber, and decomposed products are dissolved by hydrochloric acid and is evenly mixed to be of slime shape. The treatment method using the ammonian remover is characterized by comprises the following steps: the ammonian wastewater with set quantity primarily enters a pH pre-adjusting precipitation tank and enters an MAP precipitation tank later, the ammonian remover is added for reacting with the ammonian wastewater and the ammonian wastewater enters an MAP secondary precipitation tank or not according to the ammonian concentration of supernatant fluid, at last the ammonian wastewater enters a phosphorus removing tank for removing phosphorus; generated MAP is sent to the MAP decomposition chamber for being decompounded, and decomposed products and precipitate produced in the phosphorus removing tank are sent to a decomposed product dissolving chamber for dissolving. The treatment method has low cost of wastewater treatment without secondary pollution or environment factor interference; and ammonian and surplus phosphorus concentration in treated wastewater reaches national wastewater primary emission standard.

A lubricating oil composition for automatic transmissions wherein the mass ratio of phosphorus:calcium:boron:sulfur determined by elemental analysis is 1:(0.1 to 2):(0.06 to 2):(0.2 to 20), the concentration of phosphorus is from 0.01 to 0.06 percent by mass, the concentration of the sulfur derived from a base oil is from 0 to 0.1 percent by mass, and the concentration of the sulfur derived from sulfur-based additives is from 0.01 to 0.15 percent by mass, based on the total amount of the composition. The lubricating oil composition can prevent the occurrence of scratch phenomenon even over a long period of time when used in a metal belt type continuously variable automatic transmission.

The invention discloses a bend-insensitive radiation-resistant single-mode fiber and relates to the field of a single-mode fiber. The single-mode fiber comprises a core layer, an inner wrapping layer and an outer wrapping layer, which are arranged in sequence from the inside out. The core layer, the inner wrapping layer and the outer wrapping layer are made of quartz material. The inner wrapping layer comprises a first fluorine-doped inner wrapping layer and a second fluorine-doped inner wrapping layer arranged in sequence from the inside out. The core layer and the first fluorine-doped inner wrapping layer are germanium-undoped, and other metal impurities and phosphorus concentration are lower than 0.1 ppm; in mass percent, the doped fluorine content in the core layer is 0-0.45%, and chlorine content is 0.01%-0.10 %; fluorine content in the first fluorine-doped inner wrapping layer is 1.00%-1.55%; and the fluorine content in the second fluorine-doped inner wrapping layer is 3.03%-5.00%. Compared with an existing radiation-resistant single-mode fiber, additional loss of the single-mode fiber under a bending state is greatly reduced, and bending-resistant performance thereof is better, that is, the single-mode fiber is insensitive to bend; and meanwhile, the radiation-resistant capability of the single-mode fiber is better.

The invention provides a dephosphorizing method for an acid vanadium leached solution. The pH value of the acid vanadium leached solution involved in the dephosphorizing method ranges from 2.5 to 4.0, and the phosphorus concentration ranges from 0.6 g / L to 1.5 g / L; the phosphate removing agent adopted in the method is a composite phosphate removing agent composed of a component A and a component B, wherein the component A is one of Al2(SO4)3, MgSO4, CaSO4, SrSO4 and ZnSO4; the component B is [Fe(OH)n(SO4)m]q; in [Fe(OH)n(SO4)m]q, n is greater than or equal to 0.5 and less than or equal to 2, m is greater than or equal to 1 and less than or equal to 3, and q is greater than or equal to 10 and less than or equal to 100000; the molar ratio of the component A to phosphorus in the acid vanadium leached solution and the molar ratio of the component B to the phosphorus in the acid vanadium leached solution are both 0.1-5:1. According to the method, firstly, the composite phosphate removing agent is added into the acid vanadium leached solution for direct phosphorous removal; secondly, reaction liquid is subjected to aging and filtration, and then a dephosphorized vanadium leached solution is obtained. Compared with the prior art, the method has the advantages that the process is simple, and the dephosphorizing rate is high.

The present invention relates to agricultural production technology, and is especially one kind of K3 bacterial strain capable of dissolving calcium phosphate in soil and microbial fertilizer produced with the K3 bacterial strain. The bacterium strain with powerful calcium phosphate dissolving capacity is separated from limy soil, used in liquid fermentation, and mixed with specific organic carrier to produce phosphate decomposing microbial organic fertilizer, which contains phosphate decomposing microbes in 5x10<7> / g, total nitrogen in 4 wt%, total potassium in 1-2 wt%, total phosphorus in 1-2 wt% and organic matter in 35 wt%. Test shows that the phosphate decomposing microbial organic fertilizer can provide phosphorous nutrients in the effect similar to chemical phosphate fertilizer, and the phosphate decomposing bacterium can reach soluble phosphorus concentration in calcium phosphate solution up to 643 mg / l.

The invention relates to an adsorption material for treating phosphorus wastewater and use thereof. The adsorption material consists, by mass percent, of 50 to 70% of flyash zeolite and 30% to 50% of natural zeolite and is prepared by homogenously mixing the flyash zeolite with the natural zeolite based on the above proportion, the above resultant adsorption material is added, with the mass ratio of phosphorus to the adsorption material being 1: 100 to 200, to phosphorus wastewater with the pH from 3 to 10 and the phosphorus concentration from 0 to 150mg / l in order to treat the phosphorus wastewater, the contact time is 1 hour, the removal rate of phosphorus is larger than 90%, and the pH of zeolite subsequent to treatment is close to be neutral. The flyash zeolite resulting from modified synthesis in the invention not only has significant phosphorus adsorption effect, but can also realize the effective utilization of wastes to reduce the pollution of flyash to environment. Mutual combination of the flyash zeolite and the natural zeolite results in synergistic action for phosphorus adsorption, reducing the content of phosphorus in wastewater effectually. Therefore, the adsorption material of the invention for treating phosphorus wastewater has the advantages that the adsorption capacity is high, the utilization of wastes is favorable for environmental protection and the like.

Provided is a method for reclaiming iron and phosphorus from steelmaking slag, which comprises a first process, in which steelmaking slag that contains phosphorous, such as dephosphorization slag, is reduction treated using a reducing agent, such as carbon, Si, or Al, to reduce and recover iron oxides and phosphorus oxides in the slag as phosphorus-containing molten steel, a second process, in which the steelmaking slag, from which the iron oxides and phosphorus oxides have been removed, is used as a CaO source in a sintering process, and the resulting sintered ore is recycled to a blast furnace, a third process, in which the phosphorus-containing molten steel recovered by the aforementioned reduction treatment is dephosphorization treated until the phosphorus concentration in the phosphorus-containing molten steel reaches 0.1% by mass or less, and the phosphorus is concentrated into a CaO-based flux, and a fourth process, in which the phosphorus-containing molten steel with a phosphorus concentration of 0.1% by mass or less is mixed as an iron source in the blast furnace hot metal, whereby phosphorus and iron can be inexpensively recovered from said steelmaking slag, and the reclaimed phosphorus and iron can each be effectively used as resources.

The invention discloses a chemical phosphorus-removal accurate dosing system and a chemical phosphorus-removal accurate dosing control method, and belongs to the technical field of sewage treatment. The chemical phosphorus removal accurate dosing system includes a sewage treatment tank assembly, a dosing device assembly, a feedforward control assembly and a feedback control assembly. The chemicalphosphorus-removal accurate dosing control method includes the steps: according to monitoring values of orthophosphates in inflow water and outflow water, dosing of a ferric salt phosphorus-removal agent is adjusted; and through the feedforward control assembly, according to an inflow-water orthophosphate load and an outflow-water orthophosphate concentration target value, a feedforward dosage iscalculated, the chemical phosphorus-removal accurate dosing system automatically adds the phosphorus-removal agent, according a deviation between outflow-water orthophosphate concentration and the outflow-water orthophosphate concentration target value, the dosage is automatically adjusted in a feedback mode, therefore, total-phosphorus concentration of the outflow water is stable near a control value, and the agent dosage is reduced to the maximum extent. By adopting the chemical phosphorus-removal accurate dosing system and the chemical phosphorus-removal accurate dosing control method, notonly is a phosphorus-removal agent crude adding problem of a sewage plant solved, but also the stability of the outflow water can be improved, and a dosing problem and an outflow-water quality qualification hysteresis problem are solved to the maximum extent, so that sewage plant management develops towards refinement.

The invention discloses a method for improving the phosphorus concentration uniformity of doped polycrystalline or noncrystalline silicon chips. According to the method, a furnace tube is adopted for growth, phosphorane is introduced through three nozzle pipelines, and the top ends of the nozzle pipelines are arranged at the bottom, the middle and the top of a crystal boat respectively; gas is emitted from the top of the first nozzle pipeline; a plurality of lateral gas outlets are formed in each of the second and third nozzle pipelines at intervals; the diameters of the lateral gas outlets of each pipeline are gradually increased in a direction from the bottom end to the top end and adjusted by testing the phosphorus concentration of the monitored silicon chips at the fixed monitoring positions of the crystal boat; the positions of the lateral gas outlets are adjusted by testing a phosphorus concentration curve along the whole crystal boat. The invention further discloses a structure for improving the phosphorus concentration uniformity of the doped polycrystalline or noncrystalline silicon chips. According to the method and the structure, the phosphorus concentration uniformity of the silicon chips can be improved and the production cost can be reduced.

The invention discloses a rapid rhubarb seedling growing method. The rapid rhubarb seedling growing method includes the following steps: 1), building a seedling growing pool or picking a seedling growing basin and adding water; 2), picking and sterilizing a seedling growing plate, placing a seedling growing base material into the seedling growing plate, and sowing pre-treated rhubarb seeds into the seedling growing plate to acquire the seedling growing plate subjected to sowing, wherein the seedling growing base material comprises, by weight, 50-70% of peat and 30-50% of perlite; 3), placing the seedling growing plate subjected to sowing in the step 2) into the seedling growing pool or seedling growing basin in the step 1) for cultivation, and after seedling emergence, adding fertilizer into water in the seedling growing pool or seedling growing basin once every ten days until nitrogen concentration is 150-250g / L, phosphorus concentration is 10-40g / L and potassium concentration is 200-300g / L; 4), completing cultivation after the diameters of rootstocks of rhubarb seedlings are not less than 1cm and roots and the rootstocks are 5-10cm in length. The rapid rhubarb seedling growing method is simple and convenient to operate, high in seeding emergence rate, short in time, low in cost and good in economic benefit, and the rhubarb seedlings grown by the method grow rapidly, orderly and healthily.

The invention discloses a material and method for removing phosphorus in water.The material is characterized in that magnesium oxide or magnesium hydrate and calcium sulfate are prepared into particles, the particles are mixed according to the mass ratio of 2:1 to 1:4 to form a dephosphorization filter material, or powder of the two raw materials is mixed according to the mass ratio of 2:1 to 1:4 to be formed, and the material for removing phosphorus is obtained.The material slowly releases calcium ions and hydroxide groups as an activated filter material, and acts with phosphorus in the water to form hydroxyapatite sediment, micro phosphate in the water can be removed, and the phosphorus concentration of effluent reaches four kinds of ground water standards.

The invention discloses a Scnedesmus quadricauda for efficiently treating typical domestic sewage, and a culture method and application thereof. Scnedesmus quadricauda SDEC-8 is cultured in a culture medium prepared according to the nitrogen and phosphorus concentrations of the typical domestic sewage, and is collected in the stabilization period. The result proves that the growth rate, oil content and biodiesel yield of the Scnedesmus quadricauda SDEC-8 in the prepared typical domestic sewage are respectively higher than those of the Scnedesmus quadricauda SDEC-8 cultured in a BG11 culture solution. When the total nitrogen and total phosphorus concentrations of the domestic sewage are respectively 40mg.L<-1> and 8mg.L<-1>, the oil content, fatty acid methyl ester content and fatty acid methyl ester yield of the Scnedesmus quadricauda SDEC-8 are maximum, and the biodiesel has the best properties. Besides, after the prepared typical domestic sewage is treated by the Scnedesmus quadricauda SDEC-8, the nitrogen and phosphorus can be efficiently removed, and the effluent water can reach Grade A (TN<15mg.L<-1>, and TP<0.5mg.L<-1>) in Discharge Standard of Pollutants for Municipal Sewage Treatment Plant. By using the typical domestic sewage to culture the Scnedesmus quadricauda SDEC-8, the nitrogen and phosphorus are efficiently removed, abundant microalgae biodiesel is efficiently obtained, and the microalgae culture cost is lowered.

The invention discloses a water body deep phosphorous removal adsorbent and a preparation method thereof. The water body deep phosphorous removal adsorbent comprises the following raw materials in parts by weight: 10 to 60 parts of attapulgite, 10 to 60 parts of bentonite, 2 to 8 parts of aluminum salt, 2 to 6 parts of calcium salt, 10 to 30 parts of ferric salt, and 2 to 8 parts of adsorption assistant, and is prepared through steps of roasting pretreatment, crushing and mixing. A compounded material is simple in preparation technology, high in phosphorous removal efficiency, ensures that phosphorous removal efficiency can reach 99 percent or above in a water sample with the phosphorus concentration being 2mg / L, the phosphorous concentration can be reduced to be smaller than 0.050mg / L after treatment and meets the requirement of standards of Class II water body in a national surface water environment quality standard GB3838-2002.

The present invention provides a phosphorus solid-phase buffering system that can be spatially localized, i.e., banded on top of, or at specific depths, in media, e.g., soil, by which phosphorus concentrations in the media are reduced or maintained at levels sufficient for optimal plant performance. Also provided are methods for improving the cultivation of plants growing in different media. The present invention provides benefits, such as reduced water and pesticide requirements, reduced phosphorus leaching and runoff, and enhanced root growth. The invention can be used in connection with containerized or field-grown plants, e.g., crops, grasses, trees, and the like. The invention is particularly useful for greenhouse and nursery plants, ornamental propagation, vegetable and bedding transplants, and for turf used for stadium fields, golf courses, lawns and the like, where phosphorus leaching is particularly undesirable.

Disclosed are: conductive particles which can be prevented from being aggregated, can damage oxide coating films on the surfaces of electrodes in circuit members upon the connection the circuit members to each other, and can achieve high connection reliability; and an anisotropic conductive film, an assembly, and a connection method each utilizing the conductive particles. Each of the conductive particles comprises a core particle and a conductive layer formed on the surface of the core particle, wherein the core particle is a nickel particle, the conducive layer is a nickel-coated layer having a phosphorus concentration of 10 mass% or less in the surface part thereof, and the conductive layer has an average thickness of 1 to 10 nm.

The invention provides a polyisocyanate composition and a coating composition using the same. The polyisocyanate composition has small additional amount of HDI monomers after storage, excellent stability in a closed vessel and in a humid environment, and excellent curing property. The polyisocyanate composition is obtained at least by using 1,6-diisocyanatohexane. The polyisocyanate composition comprises an isocyanurate structure and an imino oxadiazinedione structure; and a phosphorus concentration is 0.01-100 ppm.

An industrial salty slurry base composite dephosphorization material and a preparation method thereof utilize industrial salty slurry and carbide slag, binder and foaming agent as auxiliary materials for developing a composite dephosphorization material used for sewage (wastewater) treatment, wherein all components in the material have the following proportions in the total material mass: 65% to 85% of the salty slurry, 10% to 25% of the carbide slag, 4% to 10% of the binder and 2-10 per thousand of the foaming agent; and the use of the high-efficient dephosphorization material can lead phosphorus concentration in discharged sewage (wastewater) to reach national 'Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant' (GB18918-2002) primary (A) standard, thus reducing the condition of waterbody eutrophication, and improving the regional ecological environment.

The invention discloses a method for controlling non-point source pollution of paddy field by integrating and combining trenches and ponds in the farmland, and relates to the technical field of agricultural environment protection. According to the invention, based on the coupling characteristics of water quantity and water quality of runoff of the paddy field, by combining the modern measurement technology, the information searching and transmission technology and the intelligent control technology, running-away control and circulation utilization of nitrogen and phosphorus runoff of the paddy field are achieved and objectives of reduction of nitrogen and phosphorus discharging, water body purification and resource recycling are achieved. The method is advantageous in that the self-cleaning function of the paddy field is developed; when the nitrogen and phosphorus concentration is higher than a threshold, outward discharging of the water on the field surface and in the pond is not performed or is reduced; stay time of the nitrogen and phosphorus in the paddy field is extended; and by use of initial rainfall runoff with the quite high contents of absorptive pollutants on the field face and in the pond, the runoff which is redundant later, cannot be absorptive and contains quite low pollutant contents is directly discharged through external discharging channels, so pollution to the surface water body by the rainfall runoff can be reduced to the greatest degree.

The invention relates to a method for deep removal of phosphorus from high phosphorus iron ore dephosphorization wastewater. The method is characterized by comprising: according to phosphorus content in high phosphorus iron ore dephosphorization wastewater, adding a dephosphorization agent according to a mass volume concentration of 15-150 g / L, adjusting the pH value to 4.0-6.5, controlling the reaction temperature to 20-90 DEG C, and carrying out a stirring reaction for 10-120 min. According to the present invention, the dephosphorization agent has characteristics of wide sources, easy obtaining, and low cost; deep removal of the phosphorus from the high phosphorus iron ore dephosphorization wastewater can be achieved; and for acid leaching phosphorus-containing wastewater with an initial concentration of 0.5-4.5 g / L, under suitable conditions, the phosphorus concentration in the water can be reduced to less than 0.5 mg / L with the absorption agent, and a phosphorus removal rate can be more than 99.99% so as to meet primary standard phosphorus content requirements of the national second class pollutant integrated discharge standard.

The invention relates to a continuous, synchronous and online monitoring method and instrument for the concentration and total quantity of TOC (total organic carbon), TN (total nitrogen) and TP (total phosphorus). The instrument mainly comprises an electromagnetic induction flowmeter, a sampling head, a reagent bottle, a carrier gas cylinder, an acidification reactor, an oxidation reactor, a semiconductor condenser, an ion absorber, a CO2 detector, a nitrate nitrogen detector, an orthophosphate detector and a data processor. The sampling head is connected with the acidification reactor through a sampling water pipe, a peristaltic pump and a flow sensor; ...; the CO2 detector, the nitrate nitrogen detector, the orthophosphate detector and the electromagnetic induction flowmeter are connected with the data processor by circuits. By means of the same set of sampling, acidification, oxidation, flow collection and data processing system and the three separate detectors, the concentration and total quantity of TOC, TN and TP in water can be measured continuously and synchronously. The instrument has the advantages of multifunction, compact structure, continuous data measurement, synchronism and instantaneity of measurement of different indexes, etc.

The invention discloses a method for removing phosphorus in concentred and dewatered sludge water by virtue of deeply-dewatered sludge water. The method comprises the following steps of: pre-precipitating the deeply-dewatered sludge water and the concentred and dewatered sludge water respectively, and removing suspended matters in the two types of sludge water; then measuring the pH values of the two types of sludge water and the concentrations of phosphorus respectively; adding the deeply-dewatered sludge water in the concentred and dewatered sludge water in a certain ratio; stirring and standing; then taking the supernatant and measuring the pH value of the effluent and the concentration of phosphorus. According to the method disclosed by the invention, the mutual reactions of sludge water generated in different sludge treatment phases of a sewage treatment plant can be utilized, precipitates are formed by the metal ions of the deeply-dewatered sludge water and the phosphorus of the concentred and dewatered sludge water, solid-liquid separation is performed on the precipitate particulate matters and the supernatant by standing, the effluent is discharged, and the formed phosphorus-containing precipitates are recycled; meanwhile, the pollutant loads of metal ions and phosphorus in the sludge water can be reduced, and the pollutant burden of the backflow of the sludge water to a front-end sewage treatment system or the entrance of the sludge water in a sludge water bio-treatment process is reduced; therefore, the method has the practical significance of treating waste with waste.

The invention discloses a protein coded by a rice phosphorus absorption and transfer regulator gene OsPHF1, which has an amino acid sequence shown in SEQ ID NO:2. The invention also discloses the gene OsPHF1 coding the protein. The gene comprises a cDNA sequence and a promoter sequence, wherein the cDNA sequence is a nucleotide sequence shown in SEQ ID NO:1; and the promoter sequence is a nucleotide sequence shown in SEQ ID NO:3. The invention also discloses application of the gene OsPHF1, namely the gene OsPHF1 is used for constructing transgenic rice. Through identification of transgenic experiments and plant tissue effective phosphorus concentration determination experiments, the gene regulates phosphorus absorption and transfer of the rice.

Provided are a scale preventing agent for reverse osmosis membranes and a scale preventing method that can prevent attachment of calcium phosphate scale arising in reverse osmosis membrane processing without increasing the phosphorus concentration in discharged water and which does not give rise to fine sludge such as gelated materials. To a reverse osmosis membrane processing system is added a scale preventing agent having a unit derived from a (methyl)acrylate and a structural unit derived from 2-(methyl)acrylamide-2-methylpropanesulfonic acid. The unit derived from 2-(methyl)acrylamide-2-methylpropanesulfonic acid is 10-40 mol%, and the main component of the scale preventing agent is a water-soluble copolymer having a mass average molecular weight of 1*10<4>-5*10<4>.