CN112723511A - High-salt-content desulfurization wastewater treatment flocculant for power plant - Google Patents

Abstract

The invention discloses a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 5-10 parts of chitosan, 5-15 parts of polyacrylamide, 20-30 parts of volcanic rock, 25-35 parts of sepiolite, 20-30 parts of ferric chloride, 20-30 parts of aluminum sulfate and 7-11 parts of hydroxyethyl cellulose. The flocculant of the invention can effectively improve the quality and effect of wastewater treatment after being applied to the treatment of high-salt-content desulfurization wastewater of a power plant.

Description

High-salt-content desulfurization wastewater treatment flocculant for power plant

Technical Field

The invention relates to a desulfurization wastewater treatment agent, in particular to a flocculant for treating high-salinity desulfurization wastewater in a power plant.

Background

In recent years, with the strictness of environmental regulations, the tail end wastewater of power plant desulfurization is a problem to be solved urgently by enterprises. A large amount of waste water can be produced in the flue gas wet desulphurization process of the thermal power plant, the impurities of the waste water come from flue gas and limestone for desulphurization, and the waste water mainly comprises sulfite, sulfate and heavy metal supersaturated with suspended matters, and the tail end waste water has high salt content and complex components and can not be recycled without advanced treatment.

If the high-salt content desulfurization wastewater of the power plant is directly discharged without being treated, serious pollution is inevitably caused to the surrounding water environment, and China requires zero emission on the desulfurization wastewater generated by wet desulfurization of a thermal power plant. Therefore, in view of economic benefit, operation cost and environmental protection requirement, it is necessary to improve the treatment effect and efficiency of high-salt desulfurization wastewater in power plants, which is very important for the power plants.

In general desulfurization wastewater, suspended matters and COD are main removal objects. A conventional chemical process that is effective in removing suspended matter and COD is the flocculation precipitation process. After a flocculating agent is added, suspended matter colloid and dispersed particles are utilized to generate floccules under the interaction of molecular force and collide and agglomerate with each other in the sedimentation process, the size and the mass of the floccules are continuously increased, the sedimentation speed is continuously increased, and finally the floccules are settled to achieve the purpose of removing suspended matters and COD.

Flocculants are mainly divided into two categories of inorganic flocculants and organic flocculants.

Inorganic flocculants fall into two major categories: iron and aluminum formulations, and also polymers. The inorganic polymer flocculant has better effect than other inorganic flocculants, and the basic reason is that the inorganic polymer flocculant can provide a large amount of complex ions and can strongly adsorb colloid particles, and the colloid is coagulated through adsorption, bridge and crosslinking. Meanwhile, the surface of the colloidal particles and suspended matters are neutralized by physical and chemical changes, the delta potential is reduced, the original repulsion of the colloidal particles is changed into attraction, the micelle stability is destroyed, the colloidal particles collide with each other to form flocculent coagulating sedimentation, the surface area of the sedimentation can reach (200-1000) m2/g, and the sedimentation has high adsorption capacity.

The inorganic flocculant has the advantages of economy, simple use method, large use amount, low flocculation effect, high cost and strong corrosivity. The organic polymer flocculant is a novel wastewater treatment agent developed only in the later 60 s of the 20 th century. Compared with the traditional flocculating agent, the flocculating agent can improve the efficiency by times, and has lower price, so that the flocculating agent tends to become a mainstream medicament. And the product quality is stable, and the production of the organic polymerization flocculant accounts for 30 to 60 percent of the total flocculant yield.

The organic-inorganic composite flocculant is mainly characterized by variety and diversified performance. The mechanism of action is primarily associated with a synergistic effect. The inorganic high molecular component adsorbs impurities and suspended particles to form particles which are gradually enlarged, and the organic high molecular component generates a net catching effect by utilizing active groups adsorbed on the organic high molecular component through the self-bridging effect, so that other impurity particles are caught and sink together. Meanwhile, the existence of inorganic salt neutralizes the surface charge of the pollutants, promotes the flocculation of organic macromolecules and greatly improves the flocculation effect.

Because the high-salinity desulfurization wastewater of the power plant belongs to tail-end wastewater, the high-salinity desulfurization wastewater has high salinity, complex components and great treatment difficulty, a more effective flocculating agent needs to be researched and developed, and the environmental protection requirement of zero emission is ensured.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the flocculating agent for treating the high-salinity desulfurization wastewater of the power plant, which is applied to the treatment of the high-salinity desulfurization wastewater of the power plant and can effectively improve the quality and the effect of wastewater treatment.

The technical scheme adopted by the invention is as follows:

the invention provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 5-10 parts of chitosan, 5-15 parts of polyacrylamide, 20-30 parts of volcanic rock, 25-35 parts of sepiolite, 20-30 parts of ferric chloride, 20-30 parts of aluminum sulfate and 7-11 parts of hydroxyethyl cellulose.

Further, the composite material comprises, by weight, 6-9 parts of chitosan, 8-13 parts of polyacrylamide, 23-28 parts of volcanic rock, 28-32 parts of sepiolite, 22-25 parts of ferric chloride, 25-29 parts of aluminum sulfate and 8-10 parts of hydroxyethyl cellulose.

Further, the coating comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate and 9 parts of hydroxyethyl cellulose.

Further, the preparation method comprises the following steps,

(1) weighing each component according to a preset proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 30-40 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Further, the diatomite fertilizer also comprises 25-35 parts by weight of diatomite.

Further, the weight part of the diatomite is 30 parts.

The preparation method comprises the following steps of,

(1) weighing each component according to a preset proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, sepiolite and diatomite, and stirring uniformly to form a mixed solution B; the mass of the water is 30-40 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Further, 15-20 parts of carbide slag by weight is also included.

Further, the weight portion of the carbide slag is 18 portions.

The preparation method comprises the following steps of,

(1) weighing each component according to a preset proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, sepiolite, diatomite and carbide slag, and stirring uniformly to form a mixed solution B; the mass of the water is 30-40 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Further, the catalyst also comprises an initiator, wherein the initiator accounts for 0.18 percent of the total mass of the rest components.

Further, the initiator is sodium persulfate.

Further, the preparation method comprises the following steps,

(1) weighing each component according to a preset proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, sepiolite, diatomite and carbide slag, and stirring uniformly to form a mixed solution B; the mass of the water is 30-40 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3), adding an initiator, and uniformly mixing;

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

The invention has the beneficial effects that:

according to the invention, through scientific compounding, the inorganic flocculant and the organic flocculant are scientifically compounded, so that the advantages and the disadvantages are made up, and mutual benefits are achieved, thus greatly improving the effects of adsorption and treatment of wastewater, increasing the flocculation effect on pollutants in the wastewater, and greatly improving the flocculation effect.

Detailed Description

In order to understand the technical solution of the present invention more clearly, the present invention is further explained below.

The technical solutions in the embodiments of the present application are described clearly and completely below by way of examples, and it is obvious that the described examples are only a part of the embodiments of the present application, and not all embodiments.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Example 1

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate and 9 parts of hydroxyethyl cellulose.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 35 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 2

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 10 parts of chitosan, 5 parts of polyacrylamide, 20 parts of volcanic rock, 35 parts of sepiolite, 20 parts of ferric chloride, 30 parts of aluminum sulfate and 7 parts of hydroxyethyl cellulose.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 30 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 3

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 5 parts of chitosan, 15 parts of polyacrylamide, 30 parts of volcanic rock, 25 parts of sepiolite, 30 parts of ferric chloride, 20 parts of aluminum sulfate and 11 parts of hydroxyethyl cellulose.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 40 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 4

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 9 parts of chitosan, 13 parts of polyacrylamide, 28 parts of volcanic rock, 28 parts of sepiolite, 25 parts of ferric chloride, 25 parts of aluminum sulfate and 8 parts of hydroxyethyl cellulose.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 36 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 5

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 6 parts of chitosan, 8 parts of polyacrylamide, 23 parts of volcanic rock, 32 parts of sepiolite, 22 parts of ferric chloride, 29 parts of aluminum sulfate and 10 parts of hydroxyethyl cellulose.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 37 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 6

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose and 30 parts of diatomite.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, diatomite and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 37 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 7

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose and 25 parts of diatomite.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, diatomite and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 37 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 8

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose and 35 parts of diatomite.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, diatomite and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 37 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 9

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose and 18 parts of carbide slag.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, carbide slag and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 37 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 10

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose and 15 parts of carbide slag.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, carbide slag and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 37 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 11

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose and 20 parts of carbide slag.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, carbide slag and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 40 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 12

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose and 20 parts of carbide slag.

The preparation method of the present example includes the following steps,

(1) weighing the components according to the proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, carbide slag and sepiolite, and stirring uniformly to form a mixed solution B; the mass of the water is 30 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3);

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 13

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose, 20 parts of acetylene sludge and an initiator sodium persulfate, wherein the addition amount of the sodium persulfate is 0.15% of the total mass of the rest components.

The preparation method of the present example includes the following steps,

(1) weighing each component according to a preset proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A; the volume concentration of acetic acid in the acetic acid solution was 1%. The dosage of the acetic acid solution is preferably that the chitosan is completely dissolved;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, sepiolite, diatomite and carbide slag, and stirring uniformly to form a mixed solution B; the mass of the water is 37 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3), adding an initiator, and uniformly mixing;

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.

Example 14

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose, 20 parts of acetylene sludge and an initiator sodium persulfate, wherein the addition amount of the sodium persulfate is 0.18% of the total mass of the rest components.

The preparation method is the same as example 13.

Example 15

The embodiment provides a high-salinity desulfurization wastewater treatment flocculant for a power plant, which comprises the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate, 9 parts of hydroxyethyl cellulose, 20 parts of acetylene sludge and an initiator sodium persulfate, wherein the addition amount of the sodium persulfate is 0.13% of the total mass of the rest components.

The preparation method is the same as example 13.

In order to verify the effect of the flocculant, the flocculant obtained in example 1, example 6, example 9 and example 13 is used for treating high-salt-content desulfurization wastewater of a certain power plant, and the removal rate of suspended matters is 98%, 98.5%, 99.5% and 99.8% after treatment; the removal rates of heavy metals are 97.3%, 98.2%, 99.1% and 99.6% respectively; the removal rates of COD were 72%, 75%, 84% and 88%, respectively.

According to the invention, through scientific compounding, the inorganic flocculant and the organic flocculant are scientifically compounded, so that the advantages and the disadvantages are made up, and mutual benefits are achieved, thus greatly improving the effects of adsorption and treatment of wastewater, increasing the flocculation effect on pollutants in the wastewater, and greatly improving the flocculation effect.

Claims (10)

1. The high-salt-content desulfurization wastewater treatment flocculant for the power plant is characterized by comprising the following components, by weight, 5-10 parts of chitosan, 5-15 parts of polyacrylamide, 20-30 parts of volcanic rock, 25-35 parts of sepiolite, 20-30 parts of ferric chloride, 20-30 parts of aluminum sulfate and 7-11 parts of hydroxyethyl cellulose.

2. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 1, characterized by comprising the following components, by weight, 6-9 parts of chitosan, 8-13 parts of polyacrylamide, 23-28 parts of volcanic rock, 28-32 parts of sepiolite, 22-25 parts of ferric chloride, 25-29 parts of aluminum sulfate and 8-10 parts of hydroxyethyl cellulose.

3. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 1, is characterized by comprising the following components, by weight, 8 parts of chitosan, 12 parts of polyacrylamide, 27 parts of volcanic rock, 30 parts of sepiolite, 24 parts of ferric chloride, 28 parts of aluminum sulfate and 9 parts of hydroxyethyl cellulose.

4. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 1, characterized by further comprising 25-35 parts by weight of diatomite.

5. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 4, characterized in that the diatomite accounts for 30 parts by weight.

6. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 4, characterized by further comprising 15-20 parts by weight of carbide slag.

7. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 6, characterized in that the weight portion of the carbide slag is 18.

8. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 7, characterized by further comprising an initiator, wherein the initiator accounts for 0.13-0.18% of the total mass of the remaining components.

9. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 8, characterized in that the initiator is sodium persulfate.

10. The power plant high-salinity desulfurization wastewater treatment flocculant according to claim 8, characterized in that the preparation method comprises the following steps,

(1) weighing each component according to a preset proportion;

(2) dissolving chitosan in an acetic acid solution, heating to 70 ℃, adding ferric chloride and aluminum sulfate, and uniformly stirring to form a mixed solution A;

(3) dissolving polyacrylamide and hydroxyethyl cellulose in water, stirring uniformly, then sequentially adding volcanic rock, sepiolite, diatomite and carbide slag, and stirring uniformly to form a mixed solution B; the mass of the water is 30-40 times of that of the polyacrylamide;

(4) uniformly mixing the mixed solution A obtained in the step (2) and the mixed solution B obtained in the step (3), adding an initiator, and uniformly mixing;

(5) and (4) filtering the mixture obtained in the step (4) to remove the solution, and drying at 60-70 ℃.