CN111039370A - Composite flocculant and preparation method and application thereof - Google Patents
Composite flocculant and preparation method and application thereof Download PDFInfo
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- CN111039370A CN111039370A CN201911336793.3A CN201911336793A CN111039370A CN 111039370 A CN111039370 A CN 111039370A CN 201911336793 A CN201911336793 A CN 201911336793A CN 111039370 A CN111039370 A CN 111039370A
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- composite flocculant
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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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Abstract
The invention discloses a composite flocculant and a preparation method and application thereof. The composite flocculant comprises 5-10 wt% of modified chitosan, 35-40 wt% of steel slag, 3-9 wt% of aluminum sulfate, 3-7 wt% of potassium oxide, 15-20 wt% of polyaluminum silicate sulfate, 5-10 wt% of calcium carbonate, 10-15 wt% of guar gum compounds and 5-10 wt% of modified starch, wherein the total weight of the composite flocculant is 100 wt%. The invention also provides a preparation method of the composite flocculant and application of the composite flocculant in heavy metal wastewater treatment. The composite flocculant provided by the invention can effectively remove pollutants in heavy metal wastewater through the actions of adsorption, flocculation and the like, so as to achieve the purpose of purifying water.
Description
Technical Field
The invention relates to the technical field of sewage treatment. More particularly, relates to a composite flocculant and a preparation method and application thereof.
Background
The fresh water resource in China is seriously insufficient, however, the water consumption is continuously increased along with the development of the industry. It is estimated that by 2030, the gap in water resources in our country will expand to 2000 billions of cubic meters. The shortage of water resources will severely limit the economic development of our country. Therefore, efficient treatment and reuse of sewage is of great importance to economic development and social progress in our country.
Flocculation is a physical and chemical method for quickly and efficiently treating sewage. It can quickly remove the pollutants in water, such as organic matters, colloid, heavy metal ions and the like. The flocculation capability of the flocculant directly influences the sewage treatment capability of the flocculation process. Common flocculants include inorganic salts, artificially synthesized organic substances and natural organic substances. Among them, natural organic substances are gaining the favor of water treatment people due to the advantages of excellent flocculation ability, no toxicity, small sludge yield and the like. However, natural organic flocculants are generally expensive, which severely limits their widespread use.
The electroplating wastewater is a common natural organic flocculant which has strong chelating capacity on heavy metal ions and can effectively remove the heavy metal ions in the heavy metal wastewater. The steel slag produced in the production process of the steel plant also has better adsorption capacity to heavy metal ions. However, when the steel slag is used for treating the heavy metal wastewater, a flocculating agent is still required to be added in the subsequent process to clarify the effluent, and iron, manganese and other ions contained in the steel slag can enter the water, so that secondary pollution is caused.
Therefore, the invention provides a composite flocculant, a preparation method and application thereof, and solves the problems.
Disclosure of Invention
The first purpose of the invention is to provide a composite flocculant.
The second purpose of the invention is to provide a preparation method of the composite flocculant.
The third purpose of the invention is to provide the application of the composite flocculant.
In order to achieve the purpose, the invention adopts the following technical scheme:
a composite flocculant, which comprises, based on 100 wt% of the total weight of the composite flocculant:
in the composite flocculant, the modified chitosan is a natural organic polymeric flocculant, a large number of amide groups and hydroxyl groups exist in chitosan molecules, the flocculant has good adsorption and flocculation capabilities, the raw materials are completely taken from the nature, the modified chitosan is soluble in water, and the flocculation capability is greatly enhanced;
the modified starch and the modified chitosan have similar functions, and the modified starch and the modified chitosan are used together, so that the application range of the medicament can be greatly improved, and the effectiveness of the flocculating agent on different pollutants is improved;
guar gum is a thickening agent and can improve the flocculation capacity of the flocculating agent;
the steel slag has higher adsorption capacity and can adsorb pollutants in the wastewater;
aluminum sulfate and poly-aluminum silicate sulfate are coagulants, so that suspended matters in the wastewater can be changed into small flocs, and the small flocs are bridged or swept by modified chitosan and modified starch;
the calcium carbonate can improve the compactness of the floc, so that the floc is not easy to break after being formed;
the potassium oxide is used for adjusting the pH value of the environment, so that the sewage is alkalescent, and the adsorption and chelation capacity of the flocculating agent on heavy metal ions is improved.
The components are matched with each other and have synergistic effect, so that pollutants in the wastewater can be effectively removed, and the effect of the invention on the aspect of wastewater treatment is weakened due to the lack of any component or the change of the content of any component.
Preferably, the modified chitosan comprises one or more of 2-hydroxypropyl trimethyl ammonium chloride chitosan, carboxymethyl chitosan and sodium xanthate chitosan.
Preferably, the modified starch is acrylamide graft copolymerization modified starch.
Preferably, the steel slag is waste slag generated in the steel-making process of a steel plant.
Preferably, the guar based compound is guar and/or guar copolymer.
Preferably, the mesh number of the modified chitosan is not less than 100 meshes.
Preferably, the mesh number of the steel slag is not less than 400 meshes.
Preferably, the mesh number of the aluminum sulfate is not less than 300 meshes.
Preferably, the mesh number of the polyaluminum silicate sulfate is not less than 300 meshes.
Preferably, the mesh number of the calcium carbonate is not less than 300 meshes.
Preferably, the mesh number of the guar gum compound is not less than 100 meshes.
Preferably, the mesh number of the modified starch is 100 meshes.
Preferably, the mesh ratio of the modified chitosan, the steel slag, the aluminum sulfate, the polyaluminum silicate sulfate, the calcium carbonate, the guar gum compound and the modified starch is 100:400:300:300:300:100: 100; in addition, the potassium oxide in the flocculant is not limited by the mesh number.
As another aspect of the present invention, the present invention further provides a preparation method of the composite flocculant, which comprises the following steps:
and uniformly mixing the modified chitosan, the steel slag, the aluminum sulfate, the potassium oxide, the poly-silicon aluminum sulfate, the calcium carbonate, the guar gum compounds and the modified starch to obtain the composite flocculant.
Preferably, the mixing uniformity of the modified chitosan, the steel slag, the aluminum sulfate, the potassium oxide, the polyaluminum silicate sulfate, the calcium carbonate, the guar gum compound and the modified starch is more than 98%.
It should be understood that, in the above steps, the mixing is a conventional technical means in the field, and stirring can be performed during the mixing process, and the purpose of stirring is to more fully mix the components and prevent local agglomeration; the above steps are carried out at room temperature unless otherwise specified; in addition, in the preparation method of the composite flocculant provided by the invention, the adding sequence of each component is not specifically required, and a person skilled in the art can reasonably adjust the adding sequence of the raw materials according to the field operation requirement.
As another aspect of the invention, the invention also provides an application of the composite flocculant in heavy metal wastewater treatment.
In addition, unless otherwise specified, any range recited herein includes any value between the endpoints and any sub-range defined by any value between the endpoints or any value between the endpoints.
The invention has the following beneficial effects:
the composite flocculant provided by the invention can effectively remove pollutants in heavy metal wastewater through the actions of adsorption, flocculation and the like, so as to achieve the purpose of purifying water.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In the invention, the preparation method is a conventional method if no special description is provided; the starting materials used are commercially available from published sources unless otherwise specified.
Example 1
The embodiment provides a composite flocculant, wherein the composite flocculant comprises the following components in an amount of 100 wt% based on the total weight of the composite flocculant:
the embodiment also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding 2-hydroxypropyl trimethyl ammonium chloride chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polyaluminium silicate sulfate and calcium carbonate into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) and (2) putting chitosan powder of 2-hydroxypropyl trimethyl ammonium chloride, steel slag powder, aluminum sulfate powder, potassium oxide, polysilicate aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer in proportion at room temperature, and stirring to obtain the composite flocculant when the mixing uniformity reaches more than 98%.
Example 2
The embodiment provides a composite flocculant, wherein the composite flocculant comprises the following components in an amount of 100 wt% based on the total weight of the composite flocculant:
the embodiment also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding carboxymethyl chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polyaluminum silicate sulfate and calcium carbonate into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) at room temperature, putting carboxymethyl chitosan powder, steel slag powder, aluminum sulfate powder, potassium oxide, polysilicone aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer in proportion, and stirring to obtain the composite flocculant when the mixing uniformity reaches more than 98%.
Example 3
The embodiment provides a composite flocculant, wherein the composite flocculant comprises the following components in an amount of 100 wt% based on the total weight of the composite flocculant:
the embodiment also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding carboxymethyl chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polyaluminum silicate sulfate and calcium carbonate into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) at room temperature, putting carboxymethyl chitosan powder, steel slag powder, aluminum sulfate powder, potassium oxide, polysilicone aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer in proportion, and stirring to obtain the composite flocculant when the mixing uniformity reaches more than 98%.
Comparative example 1
The comparative example provides a composite flocculant, wherein the composite flocculant comprises, based on the total weight of the composite flocculant taken as 100 wt%:
the comparative example also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polysilicate aluminum sulfate and calcium carbonate into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) and (2) at room temperature, proportionally putting chitosan powder, steel slag powder, aluminum sulfate powder, potassium oxide, polysilicate aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer for stirring, and obtaining the composite flocculant when the mixing uniformity reaches more than 98%.
Comparative example 2
The comparative example provides a composite flocculant, wherein the composite flocculant comprises, based on the total weight of the composite flocculant taken as 100 wt%:
the comparative example also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding 2-hydroxypropyl trimethyl ammonium chloride chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polyaluminium silicate sulfate and calcium carbonate into 300-mesh powder, and grinding sodium chloride into 400-mesh powder;
2) and (2) putting chitosan powder of 2-hydroxypropyl trimethyl ammonium chloride, sodium chloride powder, aluminum sulfate powder, potassium oxide, polysilicate aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer at room temperature in proportion, and stirring to obtain the composite flocculant when the mixing uniformity reaches more than 98%.
Comparative example 3
The comparative example provides a composite flocculant, wherein the composite flocculant comprises, based on the total weight of the composite flocculant taken as 100 wt%:
the comparative example also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding 2-hydroxypropyl trimethyl ammonium chloride chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding sodium chloride, polyaluminium silicate sulfate and calcium carbonate into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) and (2) putting chitosan powder of 2-hydroxypropyl trimethyl ammonium chloride, steel slag powder, sodium chloride powder, potassium oxide, polysilicate aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer at room temperature, and stirring until the mixing uniformity reaches more than 98%, thereby obtaining the composite flocculant.
Comparative example 4
The comparative example provides a composite flocculant, wherein the composite flocculant comprises, based on the total weight of the composite flocculant taken as 100 wt%:
the comparative example also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding 2-hydroxypropyl trimethyl ammonium chloride chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polyaluminium silicate sulfate and sodium chloride into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) and (2) putting chitosan powder of 2-hydroxypropyl trimethyl ammonium chloride, steel slag powder, aluminum sulfate powder, potassium oxide, polysilicate aluminum sulfate powder, sodium chloride powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer at room temperature, and stirring to obtain the composite flocculant when the mixing uniformity reaches more than 98%.
Comparative example 5
The comparative example provides a composite flocculant, wherein the composite flocculant comprises, based on the total weight of the composite flocculant taken as 100 wt%:
the comparative example also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding 2-hydroxypropyl trimethyl ammonium chloride chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polyaluminium silicate sulfate and calcium carbonate into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) and (2) putting chitosan powder of 2-hydroxypropyl trimethyl ammonium chloride, steel slag powder, aluminum sulfate powder, potassium chloride, polysilicate aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer in proportion at room temperature, and stirring to obtain the composite flocculant when the mixing uniformity reaches more than 98%.
Comparative example 6
The comparative example provides a composite flocculant, wherein the composite flocculant comprises, based on the total weight of the composite flocculant taken as 100 wt%:
the comparative example also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding 2-hydroxypropyl trimethyl ammonium chloride chitosan, starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polysilicate aluminum sulfate and calcium carbonate into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) and (2) putting chitosan powder of 2-hydroxypropyl trimethyl ammonium chloride, steel slag powder, aluminum sulfate powder, potassium oxide, polysilicate aluminum sulfate powder, calcium carbonate powder, guar gum powder and starch powder into a mixer in proportion at room temperature, and stirring to obtain the composite flocculant when the mixing uniformity reaches more than 98%.
Comparative example 7
The comparative example provides a composite flocculant, wherein the composite flocculant comprises, based on the total weight of the composite flocculant taken as 100 wt%:
the comparative example also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding carboxymethyl chitosan, acrylamide graft copolymer starch and guar gum into 400-mesh powder at room temperature, respectively grinding aluminum sulfate, polyaluminum silicate sulfate and calcium carbonate into 1000-mesh powder, and grinding steel slag into 1000-mesh powder;
2) at room temperature, putting carboxymethyl chitosan powder, steel slag powder, aluminum sulfate powder, potassium oxide, polysilicone aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer in proportion, and stirring to obtain the composite flocculant when the mixing uniformity reaches more than 98%.
Comparative example 8
The comparative example provides a composite flocculant, wherein the composite flocculant comprises, based on the total weight of the composite flocculant taken as 100 wt%:
the comparative example also provides a preparation method of the composite flocculant, which comprises the following steps:
1) respectively grinding carboxymethyl chitosan, acrylamide graft copolymer starch and guar gum into 100-mesh powder at room temperature, respectively grinding aluminum sulfate, polyaluminum silicate sulfate and calcium carbonate into 300-mesh powder, and grinding steel slag into 400-mesh powder;
2) at room temperature, putting carboxymethyl chitosan powder, steel slag powder, aluminum sulfate powder, potassium oxide, polysilicone aluminum sulfate powder, calcium carbonate powder, guar gum powder and acrylamide graft copolymer starch powder into a mixer in proportion, and stirring to obtain the composite flocculant when the mixing uniformity reaches 80%.
Test example 1
The test example provides an application of a composite flocculant in chromium-containing wastewater treatment, which comprises the following steps:
the composite flocculant prepared in the example 1 and the comparative examples 1 to 6 and chromium-containing wastewater in certain electroplating industry are mixed and stirred in a beaker, and a beaker experiment is carried out.
The experimental results show that: the content of chromium in raw water of chromium-containing wastewater in certain electroplating industry is 73.3 mg/L; in the test examples, the test was carried out by stirring the mixture for 10 minutes at 1mg/L, 2mg/L, 3mg/L, 4mg/L, 5mg/L, 7mg/L and 9mg/L, respectively. The residual chromium concentration after the addition is shown in Table 1. From the results of example 1, it can be seen that the flocculant of the present invention effectively removes chromium from wastewater at an addition of 7mg/L, and the concentration thereof is reduced to 0.50 mg/L; the results of comparative example 1 show that the removal efficiency of 2-hydroxypropyltrimethylammonium chloride chitosan to chromium is greatly reduced after it is substituted with chitosan because chitosan has far fewer functional groups capable of binding to chromium ions than 2-hydroxypropyltrimethylammonium chloride chitosan; the result of the comparative example 2 shows that after the steel slag is replaced by the sodium chloride, the adsorption capacity of the flocculating agent on chromium ions is greatly reduced, and the cost is greatly improved; the results of comparative example 3 show that the flocculant has a slightly reduced ability to adsorb heavy metal ions after the aluminum sulfate is replaced, but the settling rate of flocs is observed to be significantly reduced during the experiment; the results of comparative example 4 show that the lack of calcium carbonate has little effect on the chromium ion removal capacity of the flocculant, but due to the calcium carbonate, the flocs formed are not compact and brittle; the results of comparative example 5 show that the removal efficiency of chromium ions from the flocculant is greatly reduced due to the lack of potassium oxide to create a weak alkaline environment; the results of comparative example 6 show that the flocculant has a serious decrease in the ability to remove chromium ions when acrylamide graft-copolymerized starch is replaced with starch. From the above results, it can be seen that the components in this example all play their own roles in the flocculant, and cooperate to maximize the removal capacity of chromium ions.
TABLE 1 test example 1 treatment results of chromium-containing wastewater
Test example 2
The test example provides an application of a composite flocculant in zinc-containing wastewater treatment, which comprises the following steps:
the composite flocculant prepared in the example 2 and the comparative example 7 and zinc-containing wastewater in certain electroplating industry are mixed and stirred in a beaker, and a beaker experiment is carried out.
The experimental results show that: the zinc content in raw water of zinc-containing wastewater in a certain electroplating industry is 64.8 mg/L; in the test examples, the test was carried out by stirring the mixture at 1mg/L, 2mg/L, 3mg/L, 4mg/L, 5mg/L, 7mg/L and 9mg/L for 20 min. The residual zinc concentration after the addition is shown in Table 2. As can be seen from the results in Table 2, the flocculant of example 2 effectively removed zinc from wastewater at a dosage of 5 mg/L. The results of comparative example 7 show that the flocculant has a serious decrease in the adsorption capacity for heavy metal ions due to an increase in the particle size of each component in the flocculant and a decrease in the specific surface area.
Table 2 test example 2 zinc-containing wastewater treatment results
Test example 3
The test example provides an application of a composite flocculant in copper-containing wastewater treatment, which comprises the following steps:
and mixing and stirring the composite flocculant prepared in the embodiment 3 and the comparative example 8 and copper-containing wastewater of certain electroplating industry in a beaker, and carrying out a beaker experiment.
The experimental results show that: the content of copper in raw water of copper-containing wastewater in a certain electroplating industry is 94.8 mg/L; in this test example, the test was carried out by stirring the mixture for 20min at 1mg/L, 2mg/L, 3mg/L, 4mg/L, 5mg/L, 7mg/L and 9mg/L, respectively. The residual copper concentration after the addition is shown in Table 3. As can be seen from the results in Table 3, the flocculant of example 3 effectively removed copper from wastewater at an addition of 5mg/L, and the desired removal effect was obtained. The results of comparative example 8 show that the flocculant has a decreased adsorption property due to insufficient mixing of the flocculant, and copper ions cannot be effectively removed
Table 3 test example 3 treatment results of copper-containing wastewater
In conclusion, the components of the flocculant are mutually matched and have synergistic effect, so that the effect of adsorbing and flocculating heavy metal ions is optimal, and the flocculation capability and the removal efficiency of the heavy metal ions of the flocculant are reduced due to the lack of one or more of modified chitosan, steel slag, aluminum sulfate, potassium oxide, polyaluminum silicate sulfate, calcium carbonate, guar gum compounds and acrylamide graft copolymer starch. It is worth mentioning that calcium carbonate in the flocculant component has the function of increasing the compactness of flocs and ensuring that the flocs are not easy to break, and is also indispensable.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. The composite flocculant is characterized by comprising the following components in percentage by weight of 100 percent of the total weight of the composite flocculant:
2. the composite flocculant of claim 1, wherein the modified chitosan comprises one or more of 2-hydroxypropyl trimethyl ammonium chloride chitosan, carboxymethyl chitosan and sodium xanthate chitosan.
3. The composite flocculant of claim 1, wherein the modified starch is acrylamide graft copolymer modified starch.
4. The composite flocculant of claim 1, wherein the steel slag is waste slag generated in a steel-making process of a steel plant.
5. The composite flocculant according to claim 1, wherein the guar-based compound is guar and/or a guar copolymer.
6. The composite flocculant according to claim 1, wherein the modified chitosan has a mesh number of not less than 100 meshes; the mesh number of the steel slag is not less than 400 meshes; the mesh number of the aluminum sulfate is not less than 300 meshes; the mesh number of the polyaluminum silicate sulfate is not less than 300 meshes; the mesh number of the calcium carbonate is not less than 300 meshes; the mesh number of the guar gum compound is not less than 100 meshes; the mesh number of the modified starch is not less than 100 meshes.
7. The composite flocculant of claim 1, wherein the mesh ratio of the modified chitosan, the steel slag, the aluminum sulfate, the polyaluminum silicate sulfate, the calcium carbonate, the guar gum compound and the modified starch is 100:400:300:300: 100: 100.
8. The preparation method of the composite flocculant according to any one of claims 1 to 7, characterized by comprising the following steps:
and uniformly mixing the modified chitosan, the steel slag, the aluminum sulfate, the potassium oxide, the poly-silicon aluminum sulfate, the calcium carbonate, the guar gum compounds and the modified starch to obtain the composite flocculant.
9. The method for preparing the composite flocculant according to claim 8, wherein the mixing uniformity of the modified chitosan, the steel slag, the aluminum sulfate, the potassium oxide, the polyaluminum silicate sulfate, the calcium carbonate, the guar gum compound and the modified starch is 98% or more.
10. The application of the composite flocculant of any one of claims 1 to 7 in treatment of heavy metal wastewater.
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Application publication date: 20200421 |