CN111908654A - Efficient phosphorus removal agent for removing phosphorus from sewage - Google Patents
Efficient phosphorus removal agent for removing phosphorus from sewage Download PDFInfo
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- CN111908654A CN111908654A CN202010672304.8A CN202010672304A CN111908654A CN 111908654 A CN111908654 A CN 111908654A CN 202010672304 A CN202010672304 A CN 202010672304A CN 111908654 A CN111908654 A CN 111908654A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to the technical field of sewage dephosphorization, in particular to a high-efficiency dephosphorizing agent for sewage dephosphorization, which solves the defects that most chemical treatment methods in the prior art have pH requirements, the pH value of waste liquid can change after the treatment by using the chemical method, a pH regulator is required to be additionally added to adjust the pH value of the waste liquid, and the dephosphorization cost of the waste liquid is increased, and comprises the following raw materials: polyaluminium chloride, aluminium sulfate, ferrous sulfate, a supplement, waste concrete powder and water, wherein the supplement is one or more of sodium aluminate or sodium acetate. The waste concrete is used for setting the carrier, so that the waste concrete is recycled, the phosphorus removal agent is convenient to adsorb and use, the ferrous sulfate and the polyaluminium chloride are combined to realize the copolymerization of the ferrous sulfate and the polyaluminium chloride, the advantages of the ferrous sulfate and the polyaluminium chloride are effectively combined, the turbidity removal effect is enhanced, the raw materials are all in industrial waste residues, the cost is low, and the waste concrete carrier is suitable for wastewater treatment.
Description
Technical Field
The invention relates to the technical field of sewage dephosphorization, in particular to a high-efficiency dephosphorization agent for sewage dephosphorization.
Background
The phosphorus in the sewage mainly comes from phosphorus-containing organic matters, synthetic detergents, industrial waste liquid, chemical fertilizers and pesticides and various animal excretions in the domestic sewage. If the sewage is not completely treated, the phosphorus can be lost to rivers, lakes and seas, and the water body is eutrophicated. The eutrophication phenomenon of water bodies has become one of the serious water environmental problems faced by human beings, and international experience shows that the phosphorus content from urban sewage accounts for about one third of the total phosphorus load of water bodies flowing into the surface, so that the reduction of the phosphorus content in the urban sewage is one of the main ways for preventing the eutrophication of the water bodies. The municipal sewage referred to herein includes sewage obtained by merging municipal domestic sewage, industrial wastewater and municipal runoff sewage.
In recent years, with frequent occurrence of eutrophication in rivers, lakes and seas in China caused by nitrogen and phosphorus pollution of municipal sewage and key industrial wastewater, the research, development and application of the technology for removing nitrogen and phosphorus from municipal sewage and key industrial wastewater have attracted wide attention in China. No phosphorus removal measures are provided for sewage plants constructed earlier in China, and with the implementation of Integrated wastewater discharge Standard (GB8978-1996), phosphorus removal and nitrogen removal technologies are considered for sewage plants constructed (including reconstruction and extension) 1 month and 1 day in 1998.
The phosphorus removal method mainly comprises a biological method, a chemical method and a chemical auxiliary biological method. According to survey statistics, most domestic sewage plants generally adopt a biological method for sewage dephosphorization, while most foreign sewage plants adopt a chemical method or a chemical auxiliary biological method for sewage dephosphorization, and under the condition of sewage dephosphorization adopting the biological method, the domestic and foreign experience shows that even if the biological dephosphorization system has high efficiency, the total phosphorus concentration in the treated water is difficult to be reduced to below 0.5mg/L (the first-level A standard of the integrated standard for sewage discharge), and in order to achieve the strict standard, measures such as filtering or adding chemical agents and the like are required.
Under the condition of adopting a chemical method to remove phosphorus from sewage, inorganic metal salt is added into the sewage to react with soluble salt (such as phosphate) in the sewage to generate insoluble precipitate, the insoluble precipitate is aggregated into floccules with larger particles under the action of a flocculating agent, and the aim of removing phosphorus is achieved after solid-liquid separation.
Therefore, we propose a high-efficiency dephosphorizing agent for sewage dephosphorization to solve the above problems.
Disclosure of Invention
The invention aims to solve the defects that most chemical treatment methods in the prior art have pH requirements, the pH value of the waste liquid is changed after the chemical treatment methods are used, a pH regulator is required to be additionally added to regulate the pH value of the waste liquid, and the phosphorus removal cost of the waste liquid is increased.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a high-efficiency phosphorus removal agent for sewage phosphorus removal, which comprises the following raw materials in parts by weight: 30-45 parts of polyaluminum chloride, 10-15 parts of aluminum sulfate, 20-30 parts of ferrous sulfate, 5-10 parts of potassium hydrogen phthalate, 5-10 parts of dicyandiamide formaldehyde, 5-10 parts of a supplement, 15-20 parts of waste concrete powder and 10-15 parts of water.
Preferably, the efficient phosphorus removal agent for removing phosphorus from sewage comprises the following raw materials in parts by weight: 40 parts of polyaluminum chloride, 12 parts of aluminum sulfate, 25 parts of ferrous sulfate, 8 parts of potassium hydrogen phthalate, 8 parts of dicyandiamide formaldehyde, 8 parts of a supplement, 18 parts of waste concrete powder and 13 parts of water.
Preferably, the supplement is one or more of sodium aluminate, sodium acetate or glucose.
Preferably, the preparation method of the efficient phosphorus removal agent for removing phosphorus from sewage comprises the following steps:
s1: taking the components in the parts for later use;
s2: activating the waste concrete at a low temperature for 10-30 min;
s3: crushing the waste concrete treated in the step S2, and sieving to obtain waste concrete powder;
s4: placing polyaluminium chloride, aluminum sulfate and ferrous sulfate in a reaction kettle, keeping the humidity at 20% -50%, continuously and uniformly stirring for 10-30 min, then adding potassium hydrogen phthalate, dicyandiamide formaldehyde and a supplement agent at the temperature of 45-65 ℃, and stirring for 40-50 min to obtain a mixture;
s5: adding half of the amount of water in S1 into the mixture to prepare magnetic fluid, drying, grinding and sieving to obtain magnetic fluid powder;
s6: and adding waste concrete powder into the magnetofluid powder, adding the residual water, uniformly dispersing, drying, grinding and sieving to obtain the phosphorus removing agent.
Preferably, the method comprises the following steps:
s1: taking the components in the parts for later use;
s2: activating the waste concrete at low temperature for 20 min;
s3: crushing the waste concrete treated in the step S2, and sieving to obtain waste concrete powder;
s4: placing polyaluminium chloride, aluminum sulfate and ferrous sulfate in a reaction kettle, keeping the humidity at 30%, continuously and uniformly stirring for 20min, then adding potassium hydrogen phthalate, dicyandiamide formaldehyde and a supplement agent at 55 ℃, and stirring for 45min to obtain a mixture;
s5: adding half of the amount of water in S1 into the mixture to prepare magnetic fluid, drying, grinding and sieving to obtain magnetic fluid powder;
s6: and adding waste concrete powder into the magnetofluid powder, adding the residual water, uniformly dispersing, drying, grinding and sieving to obtain the phosphorus removing agent.
Preferably, in the S2, the low temperature condition is 200 to 300 ℃.
Preferably, in the step S3, a crushing kettle is used for crushing, the speed of a crushing paddle is 800-1000 r/min, and the number of the sieved meshes is 200-300 meshes.
Preferably, the method further comprises S7, wherein in S7, the dephosphorizing agent is subjected to ball milling activation treatment by a ball mill.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention realizes the copolymerization of ferrous sulfate and polyaluminium chloride by combining the ferrous sulfate and the polyaluminium chloride, effectively integrates the advantages of the ferrous sulfate and the polyaluminium chloride, enhances the turbidity removing effect, has the effective iron and aluminium content of more than 22 percent, strong hygroscopicity of products, large floc specific gravity, high flocculation speed, easy filtration and high water yield, adopts industrial waste residues as raw materials, has lower cost and is suitable for wastewater treatment.
2. The invention arranges the replenisher in the phosphorus removing agent, supplements necessary nutrient substances of microorganisms by utilizing sodium acetate or sodium aluminate, leads the precipitation effect of the microorganisms to be more ideal, can remove the total phosphorus in the water body to the greatest extent, can completely avoid the negative effect caused by ferric salt or aluminum salt, can also realize the advantages of having no negative effect on the microorganisms in the water body and enhancing the activity of sludge wastewater.
3. The method utilizes the waste concrete to set the carrier, and the hardened gel matrix and the aggregate exist in the waste concrete, so that the phosphorus removing agent is convenient to adsorb and use, the waste gas concrete is recycled, the waste and pollution of resources are avoided, and the mass production is easy to realize.
4. According to the invention, the reaction speed of the phosphorus removing agent is improved by using the potassium hydrogen phthalate, so that the phosphorus removing agent can quickly react to remove phosphorus after being put into waste liquid and sewage, and the phosphorus removing agent can decolorize the sewage in the phosphorus removing process by combining dicyandiamide formaldehyde, so that the finally treated sewage is clear, and a better treatment visual effect is achieved.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. When "mass, concentration, temperature, time, or other value or parameter is expressed as a range, preferred range, or as a range defined by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, a range of 1 to 50 should be understood to include any number, combination of numbers, or subrange selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, and all fractional values between the above integers, e.g., 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and 1.9. With respect to sub-ranges, specifically consider "nested sub-ranges" that extend from any endpoint within the range. For example, nested sub-ranges of exemplary ranges 1-50 may include 1-10, 1-20, 1-30, and 1-40 in one direction, or 50-40, 50-30, 50-20, and 50-10 in another direction. "
The present invention will be further illustrated with reference to the following specific examples.
Example one
The invention provides a high-efficiency phosphorus removal agent for sewage phosphorus removal, which comprises the following raw materials in parts by weight: 30 parts of polyaluminum chloride, 10 parts of aluminum sulfate, 20 parts of ferrous sulfate, 5 parts of potassium hydrogen phthalate, 5 parts of dicyandiamide formaldehyde, 5 parts of a supplement, 15 parts of waste concrete powder and 10 parts of water.
Wherein the supplement is sodium aluminate.
The preparation method of the phosphorus removing agent comprises the following steps:
s1: taking the components in the parts for later use;
s2: activating the waste concrete at the low temperature of 200 ℃ for 10 min;
s3: crushing the waste concrete treated in the step S2 at a crushing rate of 800r/min, and sieving the crushed waste concrete with a sieve mesh number of 200 meshes to obtain waste concrete powder;
s4: placing polyaluminium chloride, aluminum sulfate and ferrous sulfate in a reaction kettle, keeping the humidity at 20%, continuously and uniformly stirring for 10min, then adding potassium hydrogen phthalate, dicyandiamide formaldehyde and a supplement agent at 45 ℃, and stirring for 40min to obtain a mixture;
s5: adding half of the amount of water in S1 into the mixture to prepare magnetic fluid, drying, grinding and sieving to obtain magnetic fluid powder;
s6: and adding waste concrete powder into the magnetofluid powder, adding the residual water, uniformly dispersing, drying, grinding and sieving to obtain the phosphorus removing agent.
Example two
The invention provides a high-efficiency phosphorus removal agent for sewage phosphorus removal, which comprises the following raw materials in parts by weight: 40 parts of polyaluminum chloride, 13 parts of aluminum sulfate, 25 parts of ferrous sulfate, 8 parts of potassium hydrogen phthalate, 8 parts of dicyandiamide formaldehyde, 8 parts of a supplement, 18 parts of waste concrete powder and 12 parts of water.
Wherein the supplement is sodium acetate.
The preparation method of the phosphorus removing agent comprises the following steps:
s1: taking the components in the parts for later use;
s2: activating the waste concrete at a low temperature of 250 ℃ for 20 min;
s3: crushing the waste concrete treated in the step S2 at a crushing rate of 900r/min, and sieving the waste concrete with a sieve mesh number of 250 meshes to obtain waste concrete powder;
s4: placing polyaluminium chloride, aluminum sulfate and ferrous sulfate in a reaction kettle, keeping the humidity at 30%, continuously and uniformly stirring for 20min, then adding potassium hydrogen phthalate, dicyandiamide formaldehyde and a supplement agent at 55 ℃, and stirring for 45min to obtain a mixture;
s5: adding half of the amount of water in S1 into the mixture to prepare magnetic fluid, drying, grinding and sieving to obtain magnetic fluid powder;
s6: and adding waste concrete powder into the magnetofluid powder, adding the residual water, uniformly dispersing, drying, grinding and sieving to obtain the phosphorus removing agent.
EXAMPLE III
The invention provides a high-efficiency phosphorus removal agent for sewage phosphorus removal, which comprises the following raw materials in parts by weight: 42 parts of polyaluminum chloride, 14 parts of aluminum sulfate, 28 parts of ferrous sulfate, 8 parts of potassium hydrogen phthalate, 8 parts of dicyandiamide formaldehyde, 8 parts of a supplement, 18 parts of waste concrete powder and 14 parts of water.
Wherein the supplement is glucose.
The preparation method of the phosphorus removing agent comprises the following steps:
s1: taking the components in the parts for later use;
s2: activating the waste concrete at a low temperature of 280 ℃ for 25 min;
s3: crushing the waste concrete treated in the step S2 at a crushing rate of 950r/min, and sieving the crushed waste concrete with a sieve mesh number of 280 meshes to obtain waste concrete powder;
s4: placing polyaluminium chloride, aluminum sulfate and ferrous sulfate in a reaction kettle, keeping the humidity at 40%, continuously and uniformly stirring for 25min, then adding potassium hydrogen phthalate, dicyandiamide formaldehyde and a supplement agent at 60 ℃, and stirring for 48min to obtain a mixture;
s5: adding half of the amount of water in S1 into the mixture to prepare magnetic fluid, drying, grinding and sieving to obtain magnetic fluid powder;
s6: and adding waste concrete powder into the magnetofluid powder, adding the residual water, uniformly dispersing, drying, grinding and sieving to obtain the phosphorus removing agent.
Example four
The invention provides a high-efficiency phosphorus removal agent for sewage phosphorus removal, which comprises the following raw materials in parts by weight: 45 parts of polyaluminum chloride, 15 parts of aluminum sulfate, 30 parts of ferrous sulfate, 10 parts of potassium hydrogen phthalate, 10 parts of dicyandiamide formaldehyde, 10 parts of a supplement, 20 parts of waste concrete powder and 15 parts of water.
Wherein the supplement is sodium aluminate.
The preparation method of the phosphorus removing agent comprises the following steps:
s1: taking the components in the parts for later use;
s2: activating the waste concrete at the low temperature of 300 ℃ for 30 min;
s3: crushing the waste concrete treated in the step S2 at a crushing rate of 1000r/min, and sieving the crushed waste concrete with a sieve mesh number of 300 to obtain waste concrete powder;
s4: placing polyaluminium chloride, aluminum sulfate and ferrous sulfate in a reaction kettle, keeping the humidity at 50%, continuously and uniformly stirring for 30min, then adding potassium hydrogen phthalate, dicyandiamide formaldehyde and a supplement agent at 65 ℃, and stirring for 50min to obtain a mixture;
s5: adding half of the amount of water in S1 into the mixture to prepare magnetic fluid, drying, grinding and sieving to obtain magnetic fluid powder;
s6: and adding waste concrete powder into the magnetofluid powder, adding the residual water, uniformly dispersing, drying, grinding and sieving to obtain the phosphorus removing agent.
Comparative example 1
A phosphorus removal agent for removing phosphorus from sewage comprises the following raw materials in parts by weight: 45 parts of polyaluminum chloride, 15 parts of aluminum sulfate, 30 parts of ferrous sulfate, 10 parts of dicyandiamide formaldehyde, 10 parts of a supplement, 20 parts of waste concrete powder and 15 parts of water.
Wherein the supplement is sodium aluminate.
Comparative example No. two
A phosphorus removal agent for removing phosphorus from sewage comprises the following raw materials in parts by weight: 45 parts of polyaluminium chloride, 15 parts of aluminum sulfate, 30 parts of ferrous sulfate, 10 parts of potassium hydrogen phthalate, 10 parts of a supplement, 20 parts of waste concrete powder and 15 parts of water.
Wherein the supplement is sodium aluminate.
Comparative example No. three
A phosphorus removal agent for removing phosphorus from sewage comprises the following raw materials in parts by weight: 45 parts of polyaluminium chloride, 15 parts of aluminum sulfate, 30 parts of ferrous sulfate, 10 parts of supplement, 20 parts of waste concrete powder and 15 parts of water.
Wherein the supplement is sodium aluminate.
Comparative example No. four
A phosphorus removal agent for removing phosphorus from sewage comprises the following raw materials in parts by weight: 45 parts of polyaluminum chloride, 15 parts of aluminum sulfate, 30 parts of ferrous sulfate, 10 parts of potassium hydrogen phthalate, 10 parts of dicyandiamide formaldehyde, 20 parts of waste concrete powder and 15 parts of water.
The phosphorus removing agents prepared in the first to fourth examples and the first to fourth comparative examples were added to 5 tons of sewage in an amount of 1kg, respectively, and the results were as follows:
table one: example data
Table two: comparative example data
In comparison of the above tables I and II, it can be seen that the comparative examples II and III are poor in color and the compositions thereof lack dicyandiamide formaldehyde, while the treatment time of the comparative examples I and III is remarkably increased as compared with other examples, and both lack potassium hydrogen phthalate, and in the comparative example IV, due to the lack of the extender, the pH value of the final treatment liquid is remarkably increased and the final contents of COD, total phosphorus and dissolved oxygen are large.
In view of the above data results, in the embodiments of the present application, a large amount of complex ions are provided by combining ferrous sulfate, aluminum sulfate and polyaluminum chloride, and the complex ions can strongly adsorb colloid particles, so that the colloid is coagulated through adsorption, bridging and crosslinking. Meanwhile, the phosphorus removal agent also generates physical and chemical changes, neutralizes charges on the surfaces of the colloidal particles and suspended matters, reduces the potential, enables the colloidal particles to be changed from original repulsion to attraction, destroys the stability of micelles, and enables the colloidal particles to collide with each other, thereby forming flocculent coagulation sedimentation and further improving the phosphorus removal effect.
Wherein, the content of effective iron and aluminum is more than 22 percent, and the product has strong hygroscopicity.
The pH value of the waste liquid is adjusted and combined in time through the supplement agent without independently adding an agent in the treatment process, the pH value of the waste liquid is ensured to be within a better application range of the phosphorus removing agent, the supplement agent and the phosphorus removing agent are combined and arranged, the use is convenient, the single operation is realized, the manual operation cost is low, the reaction speed of the phosphorus removing agent is improved by utilizing the potassium hydrogen phthalate, the phosphorus removing agent can quickly react to realize phosphorus removal after being put into the waste liquid and the sewage, and the phosphorus removing agent can decolorize the sewage in the phosphorus removing process by combining dicyandiamide formaldehyde, so that the finally treated sewage is clear, and a better treatment visual effect is achieved.
In addition, the waste concrete is used for bearing, so that a hardened gelled matrix and aggregate exist in the waste concrete, the phosphorus removing agent is conveniently adsorbed and used by throwing, and meanwhile, the resource is recycled, the cost is saved, and the environment-friendly effect is realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The efficient phosphorus removal agent for removing phosphorus from sewage is characterized by comprising the following raw materials in parts by weight: 30-45 parts of polyaluminum chloride, 10-15 parts of aluminum sulfate, 20-30 parts of ferrous sulfate, 5-10 parts of potassium hydrogen phthalate, 5-10 parts of dicyandiamide formaldehyde, 5-10 parts of a supplement, 15-20 parts of waste concrete powder and 10-15 parts of water.
2. The efficient phosphorus removal agent for sewage phosphorus removal according to claim 1, comprising the following raw materials in parts by weight: 40 parts of polyaluminum chloride, 12 parts of aluminum sulfate, 25 parts of ferrous sulfate, 8 parts of potassium hydrogen phthalate, 8 parts of dicyandiamide formaldehyde, 8 parts of a supplement, 18 parts of waste concrete powder and 13 parts of water.
3. The efficient phosphorus removal agent for sewage phosphorus removal as claimed in claim 1 or 2, wherein the supplement agent is one or more of sodium aluminate, sodium acetate or glucose.
4. The preparation method of the efficient phosphorus removal agent for sewage phosphorus removal according to claim 3, comprising the following steps:
s1: taking the components in the parts for later use;
s2: activating the waste concrete at a low temperature for 10-30 min;
s3: crushing the waste concrete treated in the step S2, and sieving to obtain waste concrete powder;
s4: placing polyaluminium chloride, aluminum sulfate and ferrous sulfate in a reaction kettle, keeping the humidity at 20% -50%, continuously and uniformly stirring for 10-30 min, then adding potassium hydrogen phthalate, dicyandiamide formaldehyde and a supplement agent at the temperature of 45-65 ℃, and stirring for 40-50 min to obtain a mixture;
s5: adding half of the amount of water in S1 into the mixture to prepare magnetic fluid, drying, grinding and sieving to obtain magnetic fluid powder;
s6: and adding waste concrete powder into the magnetofluid powder, adding the residual water, uniformly dispersing, drying, grinding and sieving to obtain the phosphorus removing agent.
5. The preparation method of the efficient phosphorus removal agent for sewage phosphorus removal according to claim 4, comprising the following steps:
s1: taking the components in the parts for later use;
s2: activating the waste concrete at low temperature for 20 min;
s3: crushing the waste concrete treated in the step S2, and sieving to obtain waste concrete powder;
s4: placing polyaluminium chloride, aluminum sulfate and ferrous sulfate in a reaction kettle, keeping the humidity at 30%, continuously and uniformly stirring for 20min, then adding potassium hydrogen phthalate, dicyandiamide formaldehyde and a supplement agent at 55 ℃, and stirring for 45min to obtain a mixture;
s5: adding half of the amount of water in S1 into the mixture to prepare magnetic fluid, drying, grinding and sieving to obtain magnetic fluid powder;
s6: and adding waste concrete powder into the magnetofluid powder, adding the residual water, uniformly dispersing, drying, grinding and sieving to obtain the phosphorus removing agent.
6. The preparation method of the efficient phosphorus removal agent for sewage phosphorus removal according to claim 4, wherein in the S2, the low temperature condition is 200-300 ℃.
7. The preparation method of the efficient phosphorus removal agent for sewage phosphorus removal of claim 4, wherein in S3, crushing is performed by using a crushing kettle, the speed of the crushing paddle is 800-1000 r/min, and the mesh number of the sieving is 200-300 meshes.
8. The method for preparing the efficient phosphorus removal agent for sewage phosphorus removal as claimed in claim 4, further comprising S7, wherein in S7, the phosphorus removal agent is ball-milled and activated by a ball mill.
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