CN110642345A - Sewage dephosphorization flocculant and preparation method and application thereof - Google Patents
Sewage dephosphorization flocculant and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to the technical field of sewage dephosphorization, in particular to a sewage dephosphorization flocculating agent and a preparation method and application thereof. The sewage dephosphorization flocculant comprises the following raw materials in parts by weight: 365 parts of 260-portion sand slag, 190 parts of 150-portion sand slag, 3-10 parts of concentrated sulfuric acid solution with the mass fraction of 60-70%, 30-50 parts of sulfurous acid pulp waste liquid, 1-5 parts of saturated ammonium sulfate solution, 340 parts of 160-portion sand cement, 1-5 parts of carbide slag and 1-5 parts of water reducing agent. The waste is used as the main component of the flocculant after a series of modifications, and the prepared flocculant has a high-efficiency sewage dephosphorization effect and does not cause secondary pollution to a water body; meanwhile, the sewage dephosphorization flocculant prepared by the invention not only has the effect of slowly releasing the flocculation components, but also can effectively absorb eutrophic phosphorus in water body by the seedling-cultured sargassum thunbergii, thereby realizing double effects of flocculation sedimentation and biological absorption.
Description
Technical Field
The invention relates to the technical field of sewage dephosphorization, in particular to a sewage dephosphorization flocculating agent and a preparation method and application thereof.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Phosphorus is one of the main elements for maintaining life on earth, is also an essential element for forming organisms and participating in the metabolic process, and is also a key substance for causing water eutrophication. In recent years, water quality in rivers, lakes, oceans and other water areas is increasingly deteriorated, eutrophication occurs occasionally, and the influence on closed water bodies such as lakes, reservoirs and the like is particularly serious. Therefore, the development of economic and high-efficiency dephosphorization materials is a key direction for reducing phosphorus emission and controlling water eutrophication at present.
The chemical precipitation method realizes the removal of phosphorus through chemical precipitation, complex reaction and flocculation, and commonly uses aluminum salt (aluminum sulfate and sodium aluminate), iron salt (ferric sulfate, ferric chloride and ferrous sulfate) and calcium salt (lime). However, the present inventors found that: the methods of chemical precipitation, complex reaction and flocculation dephosphorization often cause overhigh alkalinity in the wastewater, and further generate metal hydroxide precipitation in the dephosphorization process; in addition, the reaction requires excessive addition of metal ions, resulting in higher cost. In addition, the sludge generated by chemical precipitation has high water content, is difficult to dehydrate and is easy to cause secondary pollution.
The biological phosphorus removal method utilizes the biological absorption of phosphorus, and has low operation cost, however, the inventor finds that: the simple biological phosphorus removal method has poor stability and strict operation, and is easily influenced by external conditions such as wastewater temperature, pH value and the like. Meanwhile, if the excess sludge cannot be discharged out of the system in time, the decomposition of the phosphorus sludge in the sedimentation tank can cause secondary pollution of phosphorus, and the excess sludge cannot be recycled.
Disclosure of Invention
Aiming at the problems, the invention provides a sewage dephosphorization flocculant and a preparation method thereof. The steel slag-based flocculating agent provided by the invention takes industrial solid waste steel slag produced in steel making by a hot splashing method as a main raw material, and has a high-efficiency dephosphorization function and can not cause secondary pollution to a water body after a series of modification treatments.
The first object of the present invention: provides a sewage dephosphorization flocculating agent.
The second object of the present invention: provides a preparation method of a sewage dephosphorization flocculant.
The third object of the present invention: provides the sewage dephosphorization flocculant and the application of the preparation method thereof.
In order to realize the purpose, the invention discloses the following technical scheme:
the invention discloses a sewage dephosphorization flocculating agent which comprises the following raw materials in parts by weight: 365 parts of 260-portion sand slag, 190 parts of 150-portion sand slag, 3-10 parts of concentrated sulfuric acid solution with the mass fraction of 60-70%, 30-50 parts of sulfurous acid pulp waste liquid, 1-5 parts of saturated ammonium sulfate solution, 340 parts of 160-portion sand cement, 1-5 parts of carbide slag and 1-5 parts of water reducing agent.
Secondly, the invention discloses a preparation method of a sewage dephosphorization flocculant, which comprises the following steps:
(1) selecting iron from the steel slag obtained by the hot splashing method, mixing the steel slag with pyrite powder cinder, and then performing steam curing; drying the product after the reaction is finished, and reacting the product with concentrated sulfuric acid solution under the heating and sealing conditions; after the reaction is finished, washing the solid product to be neutral, and carrying out reduced pressure suction filtration and drying to obtain a first precursor;
(2) soaking the first precursor obtained in the step (1) in a sulfurous acid paper pulp waste liquid, oscillating at a constant temperature, fishing out and draining a product, reacting with a saturated ammonium sulfate solution, and fishing out and draining the product to obtain a second precursor;
(3) uniformly stirring the second precursor prepared in the step (2), cement, the steel slag, the carbide slag and water in the step (1), granulating, and then spraying water for curing to obtain aggregate;
(4) and (3) mixing and stirring the aggregate prepared in the step (3), the cement, the steel slag prepared in the step (1), water and 1-5 parts of water reducing agent uniformly, forming, spraying water and maintaining to obtain the sewage dephosphorization flocculating agent.
Finally, the invention discloses the application of the sewage dephosphorization flocculant and the preparation method thereof in the field of environmental protection; such as purification of polluted water bodies.
One of the characteristics of the flocculant prepared by the invention is as follows: through pressure steaming and concentrated sulfuric acid acidification, simple substance iron and ferrous oxide of the steel slag and the pyrite slag are dissolved and converted into ferric sulfate, and the crystal structure is damaged, so that defects are caused, the hydration activity of the steel slag is improved, and the long-term strength and durability of the aggregate are improved.
The flocculant prepared by the invention has the following two characteristics: the adopted sulfite pulp waste liquid can effectively erode and decompose the vitreous body of the steel slag, promote the dissolution of iron and aluminum and improve the activity of silicate minerals.
The flocculant prepared by the invention has the third characteristic that: the saturated ammonium sulfate solution can reduce the alkalinity of the flocculating agent, prevent the generation of hydroxide precipitate and reduce the flocculation effect. The generation of ferric hydroxide and aluminum hydroxide precipitates can be promoted by over-high alkalinity of the sewage, a large amount of aluminum and iron are additionally consumed, the cost is increased, the decontamination effect is poor, the saturated ammonium sulfate solution is weakly acidic, and the alkalinity is properly regulated and controlled to prevent the generation of the hydroxide precipitates.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention takes the waste as the main component of the flocculant after a series of modifications, not only enriches the resource ways of the waste, but also the prepared flocculant has high-efficiency sewage dephosphorization effect, does not cause secondary pollution to water and is a clean flocculant which can be recycled.
(2) The sewage dephosphorization flocculating agent prepared by the invention not only has the function of slowly releasing the flocculating component, but also can effectively absorb eutrophic phosphorus in water body by the sargassum thunbergii after seedling culture, thereby realizing double effects of flocculating settling and biological absorption.
(3) The sewage dephosphorization flocculating agent prepared by the invention has an efficient removal effect on phosphorus in sewage, and the result shows that the phosphorus content in the sewage can be reduced by more than 63% after 14 days of treatment, the phosphorus content in the sewage can be reduced by more than 91% after 60 days of treatment, so that the remarkable sewage dephosphorization effect is obtained, and the cement flocculating agent can not cause secondary pollution to water bodies like traditional chemical flocculating agents such as aluminum salt, iron salt, calcium salt and the like.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be further understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
As mentioned above, the conventional chemical flocculants such as common aluminum salt, iron salt, calcium salt and the like easily cause the problems of metal hydroxide precipitation and secondary pollution caused by excessive alkali production in the wastewater, and the simple biological phosphorus removal method has the problems of poor stability, strict operation, easy influence of external conditions and the like. Therefore, the invention provides a sewage dephosphorization flocculating agent and a preparation method thereof based on industrial solid waste steel slag produced by hot splashing method steelmaking.
In some exemplary embodiments, the steel slag-based flocculant raw material comprises the following components in parts by weight: 280-portion steel slag, 150-portion pyrite powder cinder, 180-portion concentrated sulfuric acid solution with the mass fraction of 60-65%, 30-40-portion sulfurous acid pulp waste liquid, 1-3-portion saturated ammonium sulfate solution, 155-portion cement, 308-portion carbide slag and 1-2-portion water reducing agent. Tests show that when the components in the range are adopted, the prepared flocculating agent has better dephosphorization effect.
In some exemplary embodiments, the steel slag-based flocculant raw material comprises the following components in parts by weight: 332 parts of steel slag, 180 parts of pyrite powder cinder, 5 parts of concentrated sulfuric acid solution with the mass fraction of 65%, 40 parts of sulfurous acid pulp waste liquid, 1-3 parts of saturated ammonium sulfate solution, 308 parts of cement, 3 parts of carbide slag and 2 parts of water reducing agent. Tests prove that when the components are adopted, the prepared flocculating agent has the best dephosphorization effect.
In some exemplary embodiments, 165-230 parts of water, preferably 165-202 parts of water, and more preferably 202 parts of water are further included.
In some typical embodiments, the raw material composition of the sewage phosphorus removal flocculant further comprises sargassum thunbergii, and the sargassum thunbergii is matched with the sewage phosphorus removal flocculant and is placed in sewage, so that the double phosphorus removal functions of flocculation sedimentation and sargassum thunbergii bioabsorption can be realized.
In some typical embodiments, the steel slag is obtained by selecting iron from steel slag obtained by hot-splashing method steel making. The invention takes the waste as the main component of the flocculating agent after a series of modifications, not only enriches the resource utilization way of the waste, but also the prepared flocculating agent has high-efficiency sewage dephosphorization effect.
In some typical embodiments, in the step (1), the steel slag, the pyrite cinder, the ethylene glycol and the concentrated sulfuric acid solution are added in the following order by weight: 220-260 parts: 150 and 190 parts: 3-10 parts of concentrated sulfuric acid solution, wherein the mass fraction of the concentrated sulfuric acid solution is 60-70%.
In some typical embodiments, in the step (2), the sulfite pulp waste liquor and the saturated ammonium sulfate solution are added in the following proportion by weight: 30-50 parts of: 1-5 parts.
In some typical embodiments, in the step (3), the second precursor, the cement, the steel slag, the carbide slag and the water are added in the following order by weight: 50-65 parts of: 5-10 parts of: 10-15 parts of: 1-5 parts of: 15-30 parts.
In some typical embodiments, in the step (4), the aggregate, the cement, the steel slag, the water and the water reducing agent are added in the following order by weight: 1100-1300 parts: 150 and 330 parts: 50-90 parts of: 150-200 parts: 1-5 parts.
In some typical embodiments, in step (1), the steam curing method is: steaming at 150-200 deg.C and 1.2-1.6MPa for 10-12 hr.
In some exemplary embodiments, in the step (1), the heating and sealing conditions are: the mixture is stirred and reacted for 2 to 3 hours under the temperature of 50 to 75 ℃ in a sealing way.
In some exemplary embodiments, in the step (1), the drying condition is: drying at 100-115 ℃ for 2-4 hours.
In some typical embodiments, in the step (2), the oscillating under the constant temperature condition is: shaking in a constant temperature oscillator at 25-50 deg.C for 10-15 hr.
In some typical embodiments, the reaction time in step (2) is 10 to 30 minutes.
In some typical embodiments, in step (3), the particle size of the aggregates is divided into two grades, namely 19-25mm spherical aggregates and 4.5-8mm spherical aggregates. The particle size distribution and the mixing amount of the aggregate can influence the porosity and the pore diameter of the concrete, and the particle size and the mixing amount of the aggregate provided by the invention can form tiny pores in the concrete. When sewage flows through and passes through the concrete, the sewage can be fully contacted with a flocculating agent with a phosphorus removal effect, and the tiny pores are beneficial to the adhesion of sargassum thunbergii seedlings, so that the phosphorus removal efficiency is improved.
Further, the spherical aggregate with the particle size of 19-25mm and the particle size of 4.5-8mm is added in the following proportion by weight: 750-800 parts: 350-500 parts.
In some exemplary embodiments, in the steps (3) and (4), the curing conditions are: curing at 20-30 deg.C for 24 hr.
In some exemplary embodiments, the present invention further discloses a method for preparing a composite material with flocculation sedimentation and phosphorous removal functions by Sargassum thunbergii bio-absorption, comprising: filtering seawater with cellulose acetate microporous membrane, adjusting pH to alkalinity, implanting Sargassum thunbergii offspring, culturing for a set time, soaking the sewage dephosphorization flocculant prepared by the method in seawater, taking out, draining to obtain the composite material.
In some typical embodiments, the pH is 7.5-9.0 to facilitate suitable Sargassum thunbergii offspring growth.
In some exemplary embodiments, the incubation set time is: the temperature is 15-25 ℃, the illumination intensity is 1500-.
In some typical embodiments, the length of the Sargassum thunbergii offspring is 0.25-0.5 cm.
In some exemplary embodiments, the soaking time is 1-3 days.
The invention will now be further described with reference to specific embodiments.
In the following examples, the steel slags are available from Shandong Lai permanent Steel iron, Inc.
In the following examples, the pyrite cinder was purchased from pehtat mineral raw materials ltd.
In the following examples, the spent sulfite pulp was obtained from Shandong Longzheng paper industry Co.
Example 1
A preparation method of a sewage dephosphorization flocculant comprises the following steps:
(1) after selecting iron and grinding steel slag obtained by steel making by a hot splashing method, taking 220 parts of steel slag and 150 parts of pyrite powder cinder, mixing, then steam-curing at 150 ℃ and 1.6MPa for 10 hours, drying, then carrying out closed stirring reaction on the mixture and 3 parts of concentrated sulfuric acid solution with the mass fraction of 70% at 50 ℃ for 3 hours, then washing the obtained solid product to be neutral by using distilled water, carrying out vacuum filtration, and drying in an oven at 100 ℃ for 4 hours to obtain a first precursor;
(2) soaking the first precursor obtained in the step (1) in 30 parts of sulfurous acid paper pulp waste liquid, placing the sulfurous acid paper pulp waste liquid in a constant temperature oscillator at 50 ℃ for oscillation for 10 hours, fishing out the product, draining, mixing with 1 part of saturated ammonium sulfate solution for 30 minutes, fishing out, draining, and obtaining a second precursor;
(3) and (3) uniformly stirring 50 parts of the second precursor prepared in the step (2), 10 parts of cement, 10 parts of steel slag, 5 parts of carbide slag and 15 parts of water, forming into round balls with the grain sizes of 19mm and 8mm respectively serving as aggregates by using a round pot granulator, and carrying out water spraying maintenance at the temperature of 20 ℃ for 24 hours.
(4) And (3) respectively taking the 19mm aggregate prepared in the step (3), 750 parts, 500 parts, 150 parts of cement, 50 parts of steel slag, 150 parts of water and 5 parts of water reducing agent, mixing and stirring uniformly, forming into a cube concrete test block with the side length of 40cm, and spraying water at 20 ℃ for curing for 24 hours to obtain the sewage dephosphorization flocculating agent test block.
Example 2
A preparation method of a sewage dephosphorization flocculant comprises the following steps:
(1) selecting iron from steel slag obtained by steel making by a hot splashing method, grinding, taking 260 parts of steel slag and 190 parts of pyrite powder cinder, mixing, steaming at 200 ℃ and 1.2MPa for 12 hours, drying, carrying out closed stirring reaction on the mixture and 10 parts of concentrated sulfuric acid solution with the mass fraction of 60% at 75 ℃ for 2 hours, washing the obtained solid product to be neutral by using distilled water, carrying out vacuum filtration, and drying at 115 ℃ for 2 hours in an oven to obtain a first precursor;
(2) soaking the first precursor obtained in the step (1) in 50 parts of sulfite pulp waste liquid, placing the sulfite pulp waste liquid in a constant-temperature oscillator at 25 ℃ for oscillation for 15 hours, fishing out the product, draining, mixing with 5 parts of saturated ammonium sulfate solution for 10 minutes, and fishing out and draining to obtain a second precursor;
(3) and (3) uniformly stirring 65 parts of the second precursor prepared in the step (2), 5 parts of cement, 15 parts of steel slag, 1 part of carbide slag and 30 parts of water, forming into balls with the particle sizes of 25mm and 4.5mm respectively serving as aggregates by using a round pot granulator, and carrying out water spraying maintenance at the temperature of 30 ℃ for 24 hours.
(4) And (3) respectively taking 25mm aggregate prepared in the step (3), 800 parts of 4.5mm aggregate, 350 parts of aggregate, 330 parts of cement, 90 parts of steel slag, 200 parts of water and 1 part of water reducing agent, mixing and stirring uniformly, forming into a cube concrete test block with the side length of 60cm, and spraying water at 30 ℃ for curing for 24 hours to obtain the sewage dephosphorization flocculating agent test block.
Example 3
A preparation method of a sewage dephosphorization flocculant comprises the following steps:
(1) selecting iron from steel slag obtained by steel making by a hot splashing method, grinding the steel slag, taking 250 parts of steel slag and 180 parts of pyrite powder cinder, mixing, steaming at 180 ℃ and 1.4MPa for 10 hours, drying, carrying out closed stirring reaction on the mixture and 5 parts of concentrated sulfuric acid solution with the mass fraction of 65% at 70 ℃ for 2.5 hours, washing the obtained solid product to be neutral by using distilled water, carrying out vacuum filtration, and drying in an oven at 110 ℃ for 3 hours to obtain a first precursor;
(2) soaking the first precursor obtained in the step (1) in 40 parts of sulfite pulp waste liquid, placing the sulfite pulp waste liquid in a constant-temperature oscillator at 35 ℃ for oscillation for 10 hours, fishing out the product, draining, mixing with 3 parts of saturated ammonium sulfate solution for 20 minutes, and fishing out and draining to obtain a second precursor;
(3) and (3) uniformly stirring 55 parts of the second precursor prepared in the step (2), 8 parts of cement, 12 parts of steel slag, 3 parts of carbide slag and 22 parts of water, forming into balls with the particle sizes of 21mm and 6mm respectively serving as aggregates by using a round pot granulator, and carrying out water spraying maintenance at 27 ℃ for 24 hours.
(4) And (3) respectively taking 21mm aggregate prepared in the step (3), 780 parts of 6mm aggregate, 450 parts of cement, 300 parts of steel slag, 180 parts of water and 2 parts of water reducing agent, mixing and stirring uniformly, forming into a cube concrete test block with the side length of 60cm, and spraying water at 25 ℃ for curing for 24 hours to obtain the sewage dephosphorization flocculating agent test block.
Example 4
A preparation method of a composite material with flocculation sedimentation and sargassum thunbergii biological absorption dephosphorization functions comprises the following steps:
(1) after seawater is filtered by a 0.45-micron cellulose acetate microporous filter membrane, the pH is regulated to 7.5, the temperature is 15 ℃, the illumination intensity is 2000lx, after 0.25 cm of sargassum thunbergii seedlings are placed for 3 days, the test block of the sewage dephosphorization flocculating agent prepared in the example 1 is placed in the seawater to be soaked for 3 days, and the cement-based solidified body is obtained after the test block is taken out and drained. It should be noted that, when the test block is soaked in seawater containing Sargassum thunbergii offspring, the offspring will be attached to the surface layer and pores of the test block, and the attached Sargassum thunbergii offspring will absorb phosphorus and grow slowly, thereby playing a role in synergistic phosphorus removal.
Example 5
A preparation method of a composite material with flocculation sedimentation and sargassum thunbergii biological absorption dephosphorization functions comprises the following steps:
(1) after seawater is filtered by a 0.90-micron cellulose acetate microporous filter membrane, the pH value is regulated to 9.0, the temperature is 25 ℃, the illumination intensity is 1500lx, 0.5 cm of sargassum thunbergii seedlings are placed for 10 days, the test block of the sewage dephosphorization flocculating agent prepared in the embodiment 2 is placed in the seawater to be soaked for 1 day, and the test block is taken out and drained to obtain the cement-based solidified body.
Example 6
A preparation method of a composite material with flocculation sedimentation and sargassum thunbergii biological absorption dephosphorization functions comprises the following steps:
(1) after seawater is filtered by a 0.68-micron cellulose acetate microporous filter membrane, the pH is regulated to 8.4, the temperature is 22 ℃, the illumination intensity is 1800lx, after 0.35 cm of sargassum thunbergii seedlings are placed for 7 days, the test block of the sewage dephosphorization flocculating agent prepared in the embodiment 3 is placed in the seawater to be soaked for 2 days, and the cement-based solidified body is obtained after the test block is taken out and drained.
And (3) performance testing:
mixing KH with water2PO4Placing the mixture in an oven, drying the mixture for 1 hour at 105 ℃, taking the mixture out, placing the mixture in a dryer, and naturally cooling the mixture to prepare 2mg/L simulated phosphorus-containing wastewater. Then, the steel slag-based flocculants prepared in examples 1 to 6 were immersed in wastewater, and the concentration of phosphorus in water was measured by the "mo-sb spectrophotometry method" according to the regulations in "method for monitoring and analyzing water and wastewater" issued by the national environmental protection agency, and the results are shown in table 1.
TABLE 1
From the detection data in table 1, it can be seen that the sewage phosphorus removal flocculant prepared in the embodiments 1 to 3 of the present invention can reduce the total phosphorus concentration in the wastewater by more than 51% after the simulated phosphorus-containing wastewater is treated for two weeks, the reduction of the total phosphorus concentration after 28 days of treatment can reach more than 86%, and when the treatment time is 60 days, the total phosphorus concentration in the wastewater basically has no rebound, which indicates that the sewage phosphorus removal flocculant prepared in the present invention has high phosphorus removal performance.
In addition, as can be seen from the detection data of the examples 4 to 6, the phosphorus content in the sewage can be reduced by more than 63% after 14 days of treatment, the phosphorus content in the sewage can be reduced by more than 91% after 60 days of treatment, the requirement of reaching surface water III class according to the national standard GBA3838-2002 is met, and the method is suitable for secondary protection areas of centralized drinking water surface water sources. Moreover, the sewage dephosphorization flocculant prepared by the invention has the function of slowly releasing the flocculation component, and when the sewage dephosphorization flocculant is matched with the Sargassum thunbergii with the function of phosphorus absorption and removal for use, the Sargassum thunbergii after seedling cultivation can effectively absorb the eutrophic phosphorus in the water body, has better phosphorus removal effect, and realizes the double effects of flocculation sedimentation and biological absorption.
In addition, through detection and simulation of indexes such as the pH value of the phosphorus-containing wastewater, the pH value of the wastewater is found to be normal, and the phenomenon that the pH value of the wastewater is abnormally changed due to the addition of the phosphorus removal flocculant for sewage is avoided, which shows that the phosphorus removal flocculant for sewage prepared by the invention can not cause secondary pollution to the wastewater.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The sewage dephosphorization flocculant is characterized by comprising the following raw materials in parts by weight: 365 parts of 260-portion sand slag, 190 parts of 150-portion sand slag, 3-10 parts of concentrated sulfuric acid solution with the mass fraction of 60-70%, 30-50 parts of sulfurous acid pulp waste liquid, 1-5 parts of saturated ammonium sulfate solution, 340 parts of 160-portion sand cement, 1-5 parts of carbide slag and 1-5 parts of water reducing agent.
2. The sewage dephosphorization flocculant of claim 1, wherein the steel slag-based flocculant comprises the following raw materials in parts by weight: 280-portion steel slag, 150-portion pyrite powder cinder, 180-portion concentrated sulfuric acid solution with the mass fraction of 60-65%, 30-40-portion sulfurous acid pulp waste liquid, 1-3-portion saturated ammonium sulfate solution, 155-portion cement, 308-portion carbide slag and 1-2-portion water reducing agent;
preferably, the steel slag-based flocculant comprises the following raw materials in parts by weight: 332 parts of steel slag, 180 parts of pyrite powder cinder, 5 parts of concentrated sulfuric acid solution with the mass fraction of 65%, 40 parts of sulfurous acid pulp waste liquid, 1-3 parts of saturated ammonium sulfate solution, 308 parts of cement, 3 parts of carbide slag and 2 parts of water reducing agent.
3. The sewage phosphorus removal flocculant of claim 1 or 2, further comprising 165-230 parts of water, preferably 165-202 parts of water, more preferably 202 parts of water;
preferably, the steel slag is obtained by selecting iron from steel slag obtained by hot splashing method steel making.
4. The sewage phosphorus removal flocculant of any one of claims 1 to 3, wherein the raw material composition of the sewage phosphorus removal flocculant further comprises sargassum thunbergii.
5. A preparation method of a sewage dephosphorization flocculant is characterized by comprising the following steps:
(1) selecting iron from the steel slag obtained by the hot splashing method, mixing the steel slag with pyrite powder cinder, and then performing steam curing; drying the product after the reaction is finished, and reacting the product with concentrated sulfuric acid solution under the heating and sealing conditions; after the reaction is finished, washing the solid product to be neutral, and carrying out reduced pressure suction filtration and drying to obtain a first precursor;
(2) soaking the first precursor obtained in the step (1) in a sulfurous acid paper pulp waste liquid, oscillating at a constant temperature, fishing out and draining a product, reacting with a saturated ammonium sulfate solution, and fishing out and draining the product to obtain a second precursor;
(3) uniformly stirring the second precursor prepared in the step (2), cement, the steel slag, the carbide slag and water in the step (1), granulating, and then spraying water for curing to obtain aggregate;
(4) and (3) mixing and stirring the aggregate prepared in the step (3), the cement, the steel slag prepared in the step (1), water and a water reducing agent uniformly, forming, spraying water and maintaining to obtain the sewage dephosphorization flocculating agent.
6. The preparation method of the sewage dephosphorization flocculant according to claim 5, wherein in the step (1), the addition proportions of the steel slag, the pyrite powder cinder, the glycol and the concentrated sulfuric acid solution are as follows in sequence: 220-260 parts: 150 and 190 parts: 3-10 parts of concentrated sulfuric acid solution, wherein the mass fraction of the concentrated sulfuric acid solution is 60-70%;
preferably, in the step (2), the adding proportion of the sulfurous acid pulp waste liquid and the saturated ammonium sulfate solution is as follows in sequence: 30-50 parts of: 1-5 parts;
preferably, in the step (3), the adding proportions of the second precursor, the cement, the steel slag, the carbide slag and the water are as follows in sequence: 50-65 parts of: 5-10 parts of: 10-15 parts of: 1-5 parts of: 15-30 parts;
preferably, in the step (4), the aggregate, the cement, the steel slag, the water and the water reducing agent are added in the following proportion by weight: 1100-1300 parts: 150 and 330 parts: 50-90 parts of: 150-200 parts: 1-5 parts.
7. The method for preparing the sewage dephosphorization flocculant according to claim 5 or 6, wherein in the step (1), the steam-curing method comprises the following steps: steaming at 150-;
preferably, in step (1), the heating and sealing conditions are as follows: stirring and reacting for 2-3 hours in a closed manner at the temperature of 50-75 ℃;
preferably, in step (1), the drying conditions are as follows: drying at 100-115 ℃ for 2-4 hours;
preferably, in the step (2), the oscillation under the constant temperature condition is as follows: oscillating for 10-15 hours in a constant temperature oscillator at 25-50 ℃;
preferably, in the step (2), the reaction time is 10 to 30 minutes.
8. The method for preparing the sewage dephosphorization flocculant according to claim 5 or 6, wherein in the step (3), the particle size of the aggregates is divided into two grades, namely spherical aggregates with the particle sizes of 19-25mm and 4.5-8 mm;
preferably, in the step (3), the spherical aggregates with the diameter of 19-25mm and the diameter of 4.5-8mm are added in the following proportion by weight: 750-800 parts: 350-500 parts;
preferably, in steps (3) and (4), the curing conditions are as follows: curing at 20-30 deg.C for 24 hr.
9. A preparation method of a composite material with flocculation sedimentation and sargassum thunbergii biological absorption dephosphorization functions is characterized by comprising the following steps: filtering seawater with cellulose acetate microporous membrane, adjusting pH to alkaline, implanting Sargassum thunbergii offspring, culturing for a set time, soaking the sewage dephosphorization flocculant prepared by any one of claims 5-8 in seawater, taking out, and draining;
preferably, the pH is 7.5-9.0;
preferably, the culture setting time is: culturing at 15-25 deg.C and illumination intensity of 1500-;
preferably, the length of the Sargassum thunbergii offspring seed is 0.25-0.5 cm;
preferably, the soaking time is 1-3 days.
10. The application of the sewage dephosphorization flocculant according to any one of claims 1 to 4 and/or the preparation method thereof according to any one of claims 5 to 8 and the sewage dephosphorization flocculant prepared by the method according to claim 9 in the field of environmental protection; such as for the purification of contaminated water.
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