26results about How to "Reduce phosphorus content" patented technology

The invention relates to the field of sludge treatment, and particularly discloses a method for recycling phosphorus in sludge pyrolysis residues, a flocculant synthesis method and application. The invention discloses a method for recovering phosphorus in sludge pyrolysis residues. The method comprises the following steps: drying the sludge pyrolysis residues, grinding and sieving; the sludge pyrolysis residues are put into a hydrochloric acid solution to react, and solid-liquid separation is carried out after the reaction; treating the phosphorus-containing extracting solution through adsorption resin to obtain a phosphorus purification solution; adjusting the pH value of the phosphorus purification liquid to 9-11, and carrying out a crystallization reaction under the condition that the molar ratio of magnesium to nitrogen to phosphorus is (0.8-1.2): (1-1.6): 1 to obtain struvite; a synthetic method of the flocculating agent is as follows: the flocculating agent is prepared from residual sludge residues. The method for recycling phosphorus in the sludge pyrolysis residues has the advantages that phosphorus resources are recycled from the sludge pyrolysis residues, and the residues are secondarily utilized. The flocculating agent is applied to municipal sewage treatment.

The invention discloses a slow-release phosphorus removal material and a preparation method and application thereof, and belongs to the technical field of sewage treatment, the slow-release phosphorus removal material comprises the following components by mass: 40-55 parts of calcium peroxide, 25-35 parts of a binder, 2-5 parts of bentonite, 5-20 parts of calcined oyster shell powder, and 10-25 parts of iron-loaded modified red soil; the binder is prepared from Portland cement, polyacrylic acid and hydroxypropyl methyl cellulose ether according to the mass ratio of 1: (0.2 to 1): (0.1 to 0.8). Under the synergistic effect of the calcium peroxide, the binder, the bentonite, the calcined oyster shell powder and the iron-loaded modified red soil, the filter material can be used as a phosphorus removal filter material, can be directly used as a filter material of a filter tank, a wetland and the like independently or in combination with quartz sand, gravel and other filter bed filter materials, can permanently remove phosphorus in surface water, can also be directly put into rivers, lakes and ponds, and can be used as a filter material of a filter tank, a wetland and the like. In addition, the preparation cost is low, and wide application prospects are achieved.

The invention discloses a water body remediation carbon sequestration and sink increasing method based on lanthanum modified bentonite, and belongs to the technical field of water body ecological remediation. Comprising the following steps: 1, isolating a to-be-restored water body, and obtaining current data of the water body; step 2, determining the current input amount of lanthanum modified bentonite and a flocculating agent based on the current data of the water body, and adding the lanthanum modified bentonite and the flocculating agent into the water body to repair the water body: blue-green algae on the surface of the water body settles, the settled blue-green algae die and decompose at the water bottom, and nutrient substances such as greenhouse gas nitrous oxide, methane and nitrogen and phosphorus are generated; aquatic plants are planted in the water body, the dissolved oxygen content of the water body is increased through photosynthesis of the aquatic plants, and release of greenhouse gases nitrous oxide and methane generated in the blue-green algae decomposition process in the second step is inhibited; in a water body environment where aquatic plants are planted, the lanthanum modified bentonite is used for locking phosphorus in a water body and bottom mud, the content of phosphorus in the water body and the bottom mud is reduced, and growth of algae is inhibited.

The invention provides a macromolecular sulfur-phosphorus composite high-temperature corrosion inhibitor for a crude oil distillation device and a preparation method and application of the macromolecular sulfur-phosphorus composite high-temperature corrosion inhibitor for the crude oil distillation device, and the preparation method of the macromolecular sulfur-phosphorus composite high-temperature corrosion inhibitor for the crude oil distillation device comprises the following steps: step 1, dropwise adding ethylenediamine into a mixture of phenylphosphonic dichloride and acetonitrile at room temperature, and reacting for 2-4 hours; step 2, adding thiourea, heating to 100-120 DEG C, and reacting for 1-2 hours; and step 3, adding fatty acid, heating to 120-140 DEG C, and reacting for 2-4 hours to obtain the macromolecular sulfur-phosphorus composite crude oil distillation device high-temperature corrosion inhibitor. The macromolecular sulfur-phosphorus composite high-temperature corrosion inhibitor for the crude oil distillation device is low in phosphorus content, contains a sulfur element, has the characteristics of small addition amount, high corrosion inhibition rate, low cost and easiness in production, and has a good application prospect and large-scale industrial popularization potential in the field of crude oil distillation devices.

The invention discloses a corrosion and scale inhibitor for green circulating cooling water and a preparation method of the corrosion and scale inhibitor, and the scale inhibitor is prepared from the following components in parts by weight: 3 to 6 parts of acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 6 to 12 parts of 1-hydroxyethylidene-1, 1-diphosphonic acid, 6 to 15 parts of 2-phosphonobutane-1, 2, 4-tricarboxylic acid, 6 to 12 parts of polyepoxysuccinic acid and 6 to 12 parts of polyaspartic acid. The method comprises the following steps: adding an acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer, 1-hydroxyethylidene-1, 1-diphosphonic acid, 2-phosphonobutane-1, 2, 4-tricarboxylic acid, polyepoxysuccinic acid, polyaspartic acid and water into a stirrer, and stirring at room temperature for 10 minutes to obtain the corrosion and scale inhibitor for the green circulating cooling water. The efficient corrosion and scale inhibition performance can be guaranteed, meanwhile, the phosphorus content in cooling circulating water is greatly reduced, and breeding of algae in the circulating water is effectively restrained.

The ecological filter dam comprises a purification system, an aquatic plant system and a river channel, the lower end of the river channel is a river bottom, the purification system comprises a filtering interception area and a deep purification area, and the filtering interception area comprises a plurality of gabion cages arranged in the water flow direction of the river channel; the lower ends of the gabion cages are provided with expansion bolts and are fixed through the expansion bolts, gravels and zeolite are filled between the gabion cages, and a plurality of fixing anchor rods are arranged at the left end and the right end of the filtering and intercepting area respectively, and a double-dam-body structure of the filtering and intercepting area and the deep purification area is adopted, so that the pollutant reduction effect can be improved, and a water body is fully purified; by means of interval piling and arrangement of filter materials in the filter interception area, blockage caused by the fact that large-particle floating objects or suspended solids enter the ecological filter dam can be effectively reduced, further, the zeolite filler layer is filled with fine holes and channels, the porosity is high, the specific surface area is large, and according to the porous characteristic of zeolite, the zeolite has good adsorbability, so that the ecological filter dam is more environment-friendly. The content of suspended matters and phosphorus in river water can be effectively reduced.

The invention provides an anti-ultraviolet aging high-strength and high-modulus PBO (poly (p-phenylene benzobisoxazole)) fiber and a preparation method thereof. The strength of the PBO fiber is 31.6-32.3 cN / dtex. The strength retention rate is greater than or equal to 62.5%, and preferably, the strength retention rate is 62.5-90.5%. The intermittent pre-polymerization process is used for intermittently preparing a pre-polymerized material, starting from a material storage kettle, continuously conveying the material, defoaming, pre-filtering, feeding the material into a final polymerization system, adding an ultraviolet light absorber before the material enters the final polymerization system for blending modification, and then spinning, washing, oiling, drying and densifying to obtain the anti-ultraviolet aging fiber. The PBO spinning solution is high in viscosity and is easy to block equipment and pipelines, so that equipment such as a pre-polymerization kettle, a middle kettle, a defoaming kettle and a double-screw extruder should be compactly arranged in space arrangement. Meanwhile, the reaction time and the reaction temperature need to be strictly controlled, the intrinsic viscosity of materials in each process is guaranteed, the process stability is guaranteed, and the anti-ultraviolet aging fiber can be obtained.

The invention discloses a preparation method and application of soybean protein with an optimal calcium-phosphorus ratio. The preparation method comprises the following steps: firstly, adding soybean meal into deionized water, adjusting the pH value to 7.5-8.0 by using a sodium hydroxide solution, stirring, centrifuging, taking supernatant, adjusting the pH value to 4.5 by using a hydrochloric acid solution, standing, centrifuging, and taking precipitate; then stirring and dispersing the precipitate in deionized water, adjusting the pH value to 7 by using a sodium hydroxide solution, and performing pulsed electric field treatment to obtain a premix; adding a compound enzyme I composed of neutral protease, bromelain, trypsin and fig protease into the premix, carrying out first enzymolysis, enzyme deactivation and homogenization treatment, adding a compound enzyme II composed of neutral phytase and alkaline phosphatase, and carrying out second enzymolysis, enzyme deactivation and pulsed electric field treatment to obtain an enzyme treatment product; and finally, adding magnetic chitosan microspheres into an enzyme treatment product, carrying out adsorption treatment and magnetic separation to remove the chitosan microspheres, and carrying out vacuum freeze drying to obtain the soybean protein. The calcium-phosphorus ratio of the obtained soybean protein is the best for human bodies, efficient absorption of calcium by the human bodies is facilitated, and the soybean protein can be used for food and beverage processing and is wide in application prospect.

This invention relates to a method for dephosphorizing waste oils. First, the raw material is pretreated using a low-pressure pyrolysis process, causing thermal degradation and polymerization of the non-hydrated phospholipids that are difficult to remove. Then, an ultrasonic-assisted acid washing process is coupled in, utilizing the ultrasonic cavitation effect to effectively disrupt the chelate structure between metal ions and phospholipid groups in the non-hydrated phospholipids. Simultaneously, the displacement effect of the ultrasound promotes relative movement and accelerated coagulation of the colloidal particles loosened by pyrolysis and acid washing in the oil phase, achieving ultrasonic-assisted demulsification and enhancing the subsequent separation efficiency between the aqueous and oil phases. Based on this, an organic acid solution is used as a complexing extractant to in-situ complex the released metal ions into water-soluble complexes, which are then transferred to the aqueous phase for separation. Through the synergistic effect of pyrolysis activating the structure, ultrasonic breaking of chelates, and organic acid complexation and transfer, this invention achieves deep dephosphorization of waste oils, significantly reducing their phosphorus content while preserving the original quality of the oils to the greatest extent possible.

The invention relates to the technical field of wet-process phosphoric acid, and particularly discloses a method for preparing semi-hydrated gypsum by desulfurization and acid return, which comprises the following steps: S1, adding phosphorite into intermediate acid in the production process of semi-hydrated wet-process phosphoric acid for desulfurization treatment to obtain desulfurized slurry, cooling the slurry, and aging to obtain bottom ore pulp and top overflow desulfurized phosphoric acid; and S2, part of the desulfurized phosphoric acid obtained in the S1 returns to a semi-hydrated wet-process phosphoric acid reaction tank to fully react with phosphorite, then excessive sulfuric acid is added for reaction, and finally solid-liquid separation is performed to obtain semi-hydrated intermediate acid and semi-hydrated gypsum. According to the method disclosed by the invention, the desulfurized intermediate acid is used for decomposing the phosphate ore, so that the phenomenon of phosphate ore passivation easily caused by too high concentration of liquid-phase sulfate radicals in the semi-hydrated process is reduced, the phosphate ore acidolysis is more complete, the decomposition efficiency is higher, and the yield of phosphorus can be improved.

The invention provides a stable and efficient phosphorus reduction process treatment method, and relates to the technical field of wastewater phosphorus reduction. The method specifically comprises the following steps: firstly, carrying out primary treatment: introducing the phosphorus-containing wastewater into a primary reaction tank, and adding a primary metal salt solution into the primary reaction tank for reaction; after the reaction, the wastewater flows to a first-stage flocculation basin, and a flocculant solution is added into the first-stage flocculation basin for a flocculation reaction; finally, the wastewater flows to a sedimentation tank to be subjected to sedimentation separation to obtain primary treated wastewater; introducing the first-stage treated wastewater into a second-stage reaction tank, and adding a second-stage metal salt solution into the second-stage reaction tank for reaction; after the reaction, the wastewater flows to a second-stage flocculation basin, and a flocculant solution is added into the second-stage flocculation basin for a flocculation reaction; finally, the wastewater flows to a sedimentation tank to be subjected to sedimentation separation to obtain treated wastewater. The phosphorus content, the solid content and the content of magnesium ammonium phosphate which is not easy to degrade in the obtained treated wastewater are relatively low, and an excellent effect is achieved.

In order to reduce the use amount of raw material methanol, improve the atom utilization rate and reduce byproduct chloromethane and the like, the invention discloses a process, a system and a control system for efficiently preparing dimethyl phosphite, and belongs to the technical field of synthesis of intermediate dimethyl phosphite of pesticide glyphosate. Wherein water and methanol are jointly used as raw materials (one molecule of water is used for replacing one molecule of methanol), the use amount of methanol is reduced, meanwhile, the byproduct chloromethane is greatly reduced, and the atom utilization rate is increased; a continuous flow reactor, a gas-liquid separator and the like are adopted, so that the whole reaction system is in a state from normal pressure to micro-positive pressure, the negative pressure state of a traditional kettle type continuous reactor is replaced, the reaction system does not need to use a vacuum pump, and the power consumption is greatly reduced; in addition, by controlling temperature, pressure, flow and the like, continuity, orderliness and controllability of the preparation process are guaranteed.

The present application relates to the technical field of industrial water treatment, and in particular to a branched polycarboxylate, a high-temperature-resistant low-phosphorus scale-inhibiting dispersant for grey water and a preparation method thereof.The high-temperature-resistant low-phosphorus scale-inhibiting dispersant for grey water comprises the following raw materials in parts by weight: 6-10 parts of disodium ethylenediaminetetraacetate, 18-22 parts of hydrolyzed polymaleic anhydride, 0.3-0.8 parts of sodium hexametaphosphate, 15-20 parts of sodium polyacrylate, 1.5-2.5 parts of aminotrimethylene phosphonic acid mother liquor, 30-38 parts of branched polycarboxylate and 15-20 parts of deionized water.The obtained scale-inhibiting dispersant can effectively inhibit carbonate scale and sulfate scale, and has good high-temperature stability.

The present application relates to the technical field of electronic circuit preparation, in particular to a nano-modified PAI-based temperature-resistant high-entropy ceramic coating, a preparation method, a coating layer, a preparation method, a ceramic substrate electronic circuit and a preparation method.The present application uses high-entropy ceramic catalyst systems (CoCrFeMnZn)3O4 and (CoCrFeNiZn)3O4 with spinel structure as catalysts, and uses PAI as a binder for high-temperature-resistant ceramic coating, which can be obtained by spraying in a controllable thickness and can be processed on flat surfaces and curved surfaces.In addition, the ceramic characteristics after solidification and the effect of the binder have a good sealing effect on the surface pores of the sintered LTCC ceramic, thereby improving the air tightness and corrosion resistance of the ceramic device.

The application discloses a collophanite reverse flotation process applied to yield improvement, and the process is characterized in that flotation reagents are sequentially added into phosphorite slurry and then introduced into roughing operation, roughing is carried out, and rough concentrate and foam product I are obtained; the foam product I is introduced into one-stage scavenging after adding an adjusting agent, and scavenging concentrate I and foam product II are obtained; the scavenging concentrate is reselected after adding flotation reagents, and reselected concentrate and foam product III are obtained; the reselected concentrate and the rough concentrate are mixed and then introduced into cleaning after adding flotation reagents, and final concentrate and foam product IV are obtained, and the foam product IV is returned to the roughing operation; the foam product III is mixed with the foam product II, and two-stage scavenging is carried out, and scavenging concentrate II and foam product V are obtained, the foam product V is final tailings, and the scavenging concentrate II is returned to the one-stage scavenging operation. The process is stable, simple and efficient, has strong adaptability to ores, and has low phosphorus content of tailings and higher phosphorus yield.

This invention belongs to the field of iron and steel metallurgy technology, specifically relating to molten steel for chromium addition in a converter for low-carbon chromium steel production. In conventional alloy steel smelting processes using high-carbon ferrochrome for alloying, the carbon content in the molten steel obtained after secondary slag formation easily exceeds the upper limit, making it difficult to obtain low-carbon chromium steel with a carbon content below 0.15% after subsequent alloying processes. To address this problem, this invention provides molten steel for chromium addition in a converter for low-carbon chromium steel production. To improve the chromium recovery rate in low-carbon chromium steel and prevent the carbon content in the molten steel obtained after secondary slag formation from exceeding the upper limit, this invention adds a small amount of chromium concentrate during the secondary slag formation process and continuously blows oxygen from the top during the secondary slag formation process. This significantly reduces the carbon content in the molten steel obtained after secondary slag formation while simultaneously improving the chromium recovery rate.

The invention discloses a tail water treatment system and method for breeding micropterus salmoides offspring seeds by using containers. The bottoms of a plurality of breeding containers of the tail water treatment system are communicated with a tail water collection pipeline through second branch pipelines; the tail water collecting pipeline is also connected with a water inlet of the microfilter; a water outlet of the microfilter is communicated with a drainage ditch in the vineyard through a third branch pipeline; the vineyard is connected with the right side of the ecological pond through a fourth branch pipeline; according to the method, the purpose of planting the weever and the grape together is achieved, in-situ treatment and ex-situ treatment of the breeding tail water are combined, carps in the breeding container mainly eat residues and residual feed at the bottom of the container, the content of granular nitrogen and phosphorus in total nitrogen and total phosphorus in a water body of the breeding container is reduced, and after the breeding tail water is treated by the microfilter, the content of the granular nitrogen and phosphorus in the water body is reduced. The solid substance is used as a fertilizer for grape growth in a vineyard, grape vines grow better, and duckweed in the ecological purification pond is used for feeding grass carp fries.

The invention is applicable to the technical field of lake water treatment, and provides an efficient phosphorus removal device for lake water, which comprises an assembly box capable of floating in a lake, a suspension box is arranged at the bottom of the assembly box, and the whole device is supported by the buoyancy of the suspension box to float on the water surface of the lake; the assembly frame is fixedly installed on the assembly box, a net basket, a filter tank and a filter box are symmetrically arranged on the assembly frame, the net basket is used for planting green plants to remove phosphorus, and the filter box is used for containing a filter material to further purify water treated by the filter tank; and the return pipe is fixedly communicated with the filter box and can discharge water purified by the filter box back to the lake. According to the efficient phosphorus removal device for the lake water body, the problem that an existing phosphorus removal method for the lake water body is low in phosphorus removal efficiency when facing high-concentration phosphorus pollution or large-area lakes is solved.

The present invention relates to a waste lubricating oil hydrogenation pretreatment method, which comprises: contacting waste lubricating oil and a composite extraction agent in an extractive distillation tower to carry out extractive distillation treatment so as to obtain a first mixed solution containing the composite extraction agent from the tower top of the extractive distillation tower, the pretreated waste lubricating oil is obtained from a tower kettle of the extractive distillation tower; wherein the composite extraction agent comprises a first component and a second component, the first component comprises one or more of a pyrrolidone compound, a furan aldehyde compound and an amide compound, and the second component comprises an ester compound. The pretreated waste lubricating oil obtained through the method is low in water content and light hydrocarbon content, the phosphorus content and the sulfur content are both reduced, and it is guaranteed that the hydrofining catalyst has stability and activity for a long time.

The invention discloses a composite microbial preparation and application thereof in treatment of mariculture wastewater, and relates to the technical field of microbial agents. According to the preparation method, bacillus velezensis, halobacillus dakamoyi and Starproteia are used as fermentation strains, fermentation is performed to obtain a fermentation bacterial liquid, and then gamma-polyglutamic acid, sodium alginate and calcium chloride are utilized to perform immobilization treatment on the fermentation bacterial liquid to prepare the compound microbial preparation. The prepared composite microbial preparation is added into the mariculture wastewater, so that the total nitrogen content, the total phosphorus content and the COD content in a water body can be effectively reduced, the efficient treatment of the mariculture wastewater is realized, and the water quality stability is improved. Wherein the bacillus velezensis, the halobacillus dakamoyi and the Starproteinia are combined for use, and a synergistic effect on reducing the removal efficiency of total nitrogen in the mariculture wastewater is achieved.

The invention provides a method for improving the raw material yield, the smelting efficiency and the molten steel cleanliness of a DRI electric arc furnace, which comprises the following steps of: filling a smelting raw material containing waste steel into the electric arc furnace, starting a power supply, and inputting electric energy into the electric arc furnace through an electrode; an electric arc furnace wall oxygen lance is used for supplying oxygen into the electric arc furnace; after a molten pool is formed in the electric arc furnace, directly reducing iron is continuously added, and oxygen and DRI fine materials are blown into the molten pool through an oxygen lance on the wall of the electric arc furnace; after the direct reduced iron completely enters the molten pool, limestone is added to the surface of the molten pool for slagging; limestone is continuously added into the electric arc furnace for slagging; blowing oxygen and DRI fine materials into the molten pool by using an oxygen lance on the wall of the electric arc furnace; and oxygen and DRI fine materials are continuously blown into the molten pool through the furnace wall oxygen lance of the electric arc furnace. According to the method, the smelting efficiency of the electric arc furnace and the cleanliness of molten steel are synchronously improved while efficient utilization of the DRI fine materials in the smelting process of the electric arc furnace is achieved and the yield of the DRI fine materials is improved.

The invention provides a high-strength and high-modulus PBO fiber and a preparation method thereof, and belongs to the field of high-performance fiber preparation. The preparation method of the high-strength and high-modulus PBO fiber comprises the following steps of (1) burdening, (2) prepolymerization, (3) material storage, (4) defoaming, (5) prefiltration, (6) final polymerization, (7) spinning, (8) solidification and (9) aftertreatment. The PBO spinning solution is high in viscosity and is easy to block equipment and pipelines, so that the prepolymerization kettle, the middle kettle, the defoaming kettle, the double-screw extruder and other equipment involved in the invention are all compactly arranged in space arrangement. Meanwhile, the reaction time and the reaction temperature need to be strictly controlled, the intrinsic viscosity of materials in each process is guaranteed, the process stability is guaranteed, and the high-strength and high-modulus fibers can be obtained.

This invention discloses a green production method for biodiesel. First, pretreated feedstock oil and methanol are preheated and then fed into a reactor loaded with a superhydrophobic polymer solid acid catalyst for esterification. After oil-water separation, the oil phase is then fed into a reactor loaded with a macroporous strong-base ion exchange resin for transesterification. The biodiesel product is collected by vacuum distillation. The biodiesel production method provided by this invention has strong feedstock adaptability, no wastewater discharge, and excessive energy consumption. Methanol can be recycled, resulting in high feedstock utilization and product quality. Furthermore, the catalyst is simple to prepare, the reaction rate is fast, and the active phase is not easily lost.

The method for improving the content of vanadium in converter vanadium slag disclosed by the embodiment of the application comprises the following steps: S1, vanadium-containing molten iron is blown oxygen smelted in a converter by adding a dephosphorizing agent and a cooling agent to obtain molten vanadium slag and semi-steel; wherein the P content in the semi-steel is lower than 0.005wt%; the CaO content in the molten vanadium slag is greater than 5wt%, and the P content is greater than 0.05wt%; S2, a high-valence oxide-containing material is added into the obtained molten vanadium slag, CO2-O2 gas is introduced for stirring, and reaction is carried out at a set temperature; during the reaction, the reaction process is synergistically strengthened by using ultrasound, microwave and a magnetic field, and a magnetic vanadium spinel and a molten silicate mixture are obtained by the reaction; the content of the magnetic solid vanadium spinel is 20-100wt%; S3, the magnetic vanadium spinel and the molten silicate mixture are separated under the condition of a magnetic field to obtain the magnetic vanadium spinel and the molten silicate, respectively.

The utility model relates to the technical field of circulating water treatment, and particularly discloses an electrolytic bath based on electrochemical descaling, which comprises a processing box body, a groove is arranged on the surface of the processing box body, an upper sealing cover is arranged on the upper surface of the processing box body, and an electrode group is fixedly connected with the bottom surface of the groove of the processing box body. A power module is fixedly installed on the lower surface of the machining box body, an electromagnetic generator is arranged on the outer surface of the machining box body, and a magnetic field distributor is installed on the outer surface of the machining box body. The electrolytic bath based on electrochemical descaling is provided with the electrode group and the electromagnetic generator, so that when the electrolytic bath works, through a titanium-based coating anode and a stainless steel cathode of the electrode group, periodic automatic electrode reversing is performed, polarization is prevented, hydrogen ions and active oxygen are generated during electrolysis, a calcium carbonate or magnesium scale layer is reduced and dissolved, and ion crystallization is interfered through an electromagnetic frequency mixing field; and finally, suspended matters are adsorbed through the medicament.

The invention belongs to the technical field of eutrophication treatment, and discloses a calcium-manganese-iron composite phosphorus removal adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing a calcium salt solution, a manganese salt solution and a ferric salt solution to obtain a metal salt solution; and under the alkaline condition, mixing the metal salt solution with the carbonate solution, standing and aging to obtain the calcium-manganese-iron composite phosphorus removal adsorbent. The calcium-manganese-iron trimetal composite phosphorus removal adsorbent prepared by the invention can play a multi-metal synergistic phosphorus removal effect, and can quickly reduce the phosphorus content of a water body, so that the proportion of active phosphorus in sediments is reduced, the proportion of inert phosphorus is increased, and the release of phosphorus in the sediments is further inhibited; the additive amount of single metal is reduced, the ecological risk caused by the single-metal phosphorus removal adsorbent is reduced, and the phosphorus removal adsorbent can play a role under different water environment conditions and is wider in application range.