CN116425279A

CN116425279A - Self-floating composite medicament for treating toxic algae bloom in water body and preparation method thereof

Info

Publication number: CN116425279A
Application number: CN202310151677.4A
Authority: CN
Inventors: 贾云璐; 龚晓贝; 白芳; 马进; 宋立荣
Original assignee: Institute of Hydrobiology of CAS
Current assignee: Institute of Hydrobiology of CAS
Priority date: 2023-02-22
Filing date: 2023-02-22
Publication date: 2023-07-14

Abstract

The invention relates to a self-floating composite medicament for treating toxic algae bloom in a water body and a preparation method thereof, wherein the self-floating composite medicament is prepared from the following raw materials in parts by weight: 35-45 parts of algae control active substances; 15-20 parts of adhesive; 0-20 parts of a hydrophobic modifier; 0-5 parts of organic acid; 3-10 parts of flocculant; 0-20 parts of light auxiliary materials; 0-3 parts of bulking agent; 0-6 parts of an anti-sticking agent. The invention also provides a method for preparing the composite medicament, which is characterized by fluidization coating or extrusion granulation. The invention has the advantages that the prepared composite medicament can float on the water surface and slowly release active ingredients on the water surface, continuously and accurately control toxic algal bloom in the water column on the water surface, continuously and slowly release the algae control ingredients, remarkably prolong the maintenance time of the algae control effect, and have obvious inhibition effect on harmful algal bloom in the middle and the bottom of the water column in the process of gradually diffusing and sinking to the bottom of the water column.

Description

Self-floating composite medicament for treating toxic algae bloom in water body and preparation method thereof

Technical Field

The invention relates to the technical field of water pollution treatment, in particular to a self-floating composite medicament for treating toxic algal bloom in a water body and a preparation method thereof.

Background

The water eutrophication and the red tide and water bloom caused by the water eutrophication lead the water environment to face serious challenges, and the harmful algae propagated in large quantity also form serious threat to the human health while destroying the balance of the water ecological system. In recent years, environmental workers synchronously control the occurrence of cyanobacteria bloom from multiple aspects such as ecological restoration, pollution source control and the like, but still face various problems and challenges. In some areas, the onset and duration of cyanobacterial bloom per year has become almost normal. Especially in summer high temperature weather, blue algae such as microcystis are greatly propagated and float on the surface of the water body, and a layer of blue-green floating foam with fishy smell is formed on the water surface, so that ecological attractiveness and biological health are very affected. In addition, death of algae can emit malodor, and some cyanobacteria can release algal toxins, particularly microcystis aeruginosa, ascophyllum longifolia, ascophyllum and ascophyllum, upon metabolism and death. Therefore, how to effectively inhibit the overgrowth of algae in water is one of the important difficulties in the protection and restoration of the ecological environment of the water body at present.

The accurate control of harmful blue algae on the surface layer of the water body is the key for improving the algae control efficiency and fully playing the maximum efficacy of the algae control agent. The common cyanobacteria bloom mainly exists on the surface layer of a water column, most algicides are easy to sink when being applied at one time, and are directly diffused in the water column to be diluted, so that the effective utilization rate is low. Most of the existing algicides cannot float, and the algicides are required to be filled in floating spheres by means of a water surface floating device, and the spheres are limited on a shading device according to Chinese patent No. CN 201510321978.2; chinese patent No. CN201711075472.3 discloses a coupling float device to float a slow release algicide on the water surface; the slow-release algicide prepared by the Chinese patent No. 201610969517.0 is required to be put into a net bag and hung on an artificial floating island when in use. Although the method solves the defect that the algicide is easy to settle, the method relies on external additional devices seriously, and the method has poor maneuverability in the area where the water bloom is seriously burst when being applied, and the algicide is difficult to replace. In addition, some existing self-floating algaecides contain grease, which has the problems of poor algae control efficiency due to no high-efficiency algae control component, or the problem of water hypoxia caused by oil film formation on the surface of water due to large grease consumption: the spraying type emulsifiable concentrate algicide provided by the Chinese invention patent CN201410286603.2 has the problems of oil film, unattractive appearance, short lasting time, difficult transportation and the like; chinese patent No. 201110022989.2 discloses an oil-water leaching solution of straw stalk with slow release function, but the consumption of edible oil is large, waste is caused, and the floating problem of edible oil and algae cells cannot be solved.

Disclosure of Invention

The invention provides a self-floating composite medicament for treating toxic algae bloom in a water body and a preparation method thereof, and aims to overcome the defects of the conventional algae control agent.

The technical scheme for solving the technical problems is as follows: a self-floating compound medicament for treating toxic algae bloom in water is prepared from the following raw materials in parts by weight: 35-45 parts of algae control active substances; 15-20 parts of adhesive; 0-20 parts of a hydrophobic modifier; 0-5 parts of organic acid; 3-10 parts of flocculant; 5-20 parts of light auxiliary materials; 0-3 parts of bulking agent; 0-6 parts of an anti-sticking agent.

On the basis of the technical scheme, the invention also has the following further specific selection or better selection.

Specifically, the algae control active substance comprises temperature-sensitive powder and/or temperature-resistant powder, wherein the temperature-sensitive powder is one or more of temperature-sensitive oxidants (potassium hydrogen persulfate, potassium permanganate, potassium ferrate, sodium percarbonate, sodium perborate, calcium hypochlorite and sodium hypochlorite) and Wen Minyi alginates (natural products such as sanguinarine, gallic acid, prodigiosin, alfalfa grass) and temperature-resistant oxidants (calcium peroxide and magnesium peroxide) and temperature-resistant algicides (one or more of copper sulfate, complex copper, quaternary ammonium salt, quaternary phosphonium salt and cationic polyamine).

Preferably, the material is prepared from the following raw materials in parts by weight: 35-45 parts of algae control active substances (temperature sensitive powder); 15-20 parts of adhesive; 15-20 parts of a hydrophobic modifier; 0-5 parts of organic acid; 3-10 parts of flocculant; 15-20 parts of light auxiliary materials; 4-6 parts of an anti-adhesion agent.

Preferably, the material is prepared from the following raw materials in parts by weight: 35-45 parts of algae control active substances (temperature resistant powder); 15-20 parts of adhesive; 0-5 parts of organic acid; 3-10 parts of flocculant; 5-10 parts of light auxiliary materials; 1-3 parts of bulking agent.

Specifically, the adhesive is one or more of polyethylene glycol, hydroxyethyl cellulose, sodium alginate, corn starch, dextrin, guar gum and xanthan gum.

Specifically, the hydrophobic modifier is one or more of benzoic acid and tyrosine.

Specifically, the organic acid is one or more of oxalic acid, pyruvic acid, tartaric acid and citric acid.

Specifically, the flocculant can be one or more of chitosan, polyacrylamide, microbial polysaccharide and polyaluminium ferric sulfate chloride, the light material is one or more of corncob, straw powder, plant ash and activated carbon, and the bulking agent is sodium bicarbonate; the anti-sticking agent is triethyl citrate and sodium dodecyl sulfate.

The invention also provides a preparation method of the self-floating composite medicament for treating toxic algae bloom in water, which is suitable for preparing the self-floating algae control agent containing various algae control active substances, and does not need kneading and extrusion during preparation, so that a bulking agent (in other words, the dosage of the bulking agent is 0) is not needed, and the preparation method comprises the following steps:

s1, preparing algicide green pellet particles: preparing 35-45 parts of algae control active substances, 15-20 parts of adhesive, 0-5 parts of organic acid, 15-20 parts of light auxiliary materials and 20-30 parts of water into wet granules by a wet mixing granulator, drying the wet granules to moisture content lower than 5%, discharging, granulating, and sieving to obtain the algae control active substances;

s2, preparing a coating mother solution: mixing modifier 15-20 weight portions, flocculant 3-10 weight portions, antisticking agent 4-6 weight portions and water 100-120 weight portions;

s3, coating and forming: and (3) forming a coating layer on the surface of the algicide green pellet prepared in the step (S1) by using the coating mother solution of the step (S2) on a fluidized bed to obtain pellets with the diameter of 1-4mm, namely the self-floating composite medicament.

The invention also provides a preparation method of the self-floating composite medicament for treating toxic algal bloom in water, which comprises the following steps:

mixing 35-45 parts of algae-controlling active substances, 15-20 parts of adhesive, 0-5 parts of organic acid, 5-10 parts of light auxiliary materials and 1-3 parts of bulking agent uniformly, then, pumping the mixture into a kneader for kneading for 30-45min, granulating the kneaded material by adopting an extrusion granulator, drying, screening, and obtaining particles with the diameter of 1-4mm, namely the self-floating composite medicament.

Compared with the prior art, the invention has the beneficial effects that:

the self-floating composite medicament provided by the invention has a self-floating slow release function, can self-float on the water surface and slowly release active ingredients (including ingredients such as algae killing, algae inhibiting, algae sinking and detoxification) on the water surface, continuously and accurately control the harmful blue algae on the water surface, continuously and slowly release the active ingredients, and remarkably prolong the maintenance time of the algae control effect. The self-floating slow-release algicide disclosed by the invention is mainly aimed at blue algae on the surface of a water body, can accurately kill toxic and harmful algae such as blue algae, euglena and the like on the surface layer of a water column, and also has an obvious inhibition effect on harmful algal bloom in the middle and at the bottom of the water column in the process of gradually diffusing and sinking to the bottom of the water column; in addition, the self-floating composite medicament provided by the invention also comprises a flocculating agent component, and aiming at a plurality of serious water bloom areas, the flocculating agent can enable the inactivated algal bloom to sink to the water bottom, so that the problem that the transparency cannot be improved and the water color is influenced due to the aggregation of the inactivated algal bloom on the surface layer of a water column is solved.

Drawings

FIG. 1 is a graph showing the effect of controlling algae after collecting microcystis water bloom floating on the surface of water in the field and after adding the self-floating composite agent and the algicide green pellet prepared in example 1, respectively, compared with a blank control group;

FIG. 2 is a graph showing the effect of controlling algae of the self-floating composite agent prepared in example 3;

FIG. 3 is a graph showing the dephosphorization effect of the self-floating composite agent prepared in example 3;

FIG. 4 is a graph showing the effect of the self-floating composite reagent prepared in example 4 on blue algae growth inhibition by microscopic observation;

FIG. 5 is a graph showing the quantitative abundance of phytoplankton in a natural water body after addition of the self-floating complex formulation prepared in example 4;

FIG. 6 is a graph of phytoplankton structure and abundance after addition of the self-floating complex agent prepared in example 4 to a natural body of water.

Detailed Description

The following description of the embodiments of the present invention further refers to the accompanying drawings, which are included to illustrate and not to limit the scope of the invention.

For the sake of brevity, the medicines used in the following examples are all commercial products unless otherwise specified, and the methods used are all conventional in the art unless otherwise specified.

Example 1

A self-floating compound medicament for treating toxic algae bloom in water is prepared from the following raw materials in parts by weight: 40 parts of potassium hydrogen persulfate; 20 parts of corn starch; 15 parts of benzoic acid; 3 parts of chitosan; 20 parts of plant ash; 2 parts of citric acid; 4 parts of triethyl citrate; 2 parts of sodium dodecyl sulfate.

The preparation method of the self-floating composite medicament comprises the following steps:

s1, preparing algicide green pellet particles: taking 40 parts of potassium hydrogen persulfate, 20 parts of corn starch, 20 parts of plant ash, 2 parts of citric acid and 20 parts of water, preparing wet granules by a wet mixing granulator, drying and discharging after the water content is lower than 5%, finishing the granules, and sieving the granules by a 5-16-mesh standard sieve to obtain the granules with the particle size of 1-4 mm;

s2, preparing a coating mother solution: mixing 15 parts of benzoic acid, 3 parts of chitosan, 4 parts of triethyl citrate, 2 parts of sodium dodecyl sulfate and 100 parts of water, and continuously heating and stirring uniformly to obtain the composition;

s3, coating and forming: forming a coating layer on the surface of the algicide green pellet prepared in the step S1 by using the coating mother liquor of the step S2 on a fluidized bed to obtain pellets with the diameter of 1-4mm, namely the self-floating composite medicament; the fluidized bed coating process conditions are determined according to the type of a fluidized bed, taking a MINI type FLP fluidized bed granulating and coating machine as an example, and the coating process conditions are as follows: the feeding amount is 100g, the fan frequency is 25Hz, the air inlet temperature is 35 ℃, the atomization pressure is 0.2Mpa, the flow rate of the coating liquid is 1mL/min, and the coating time is 20min.

Example 2

A self-floating compound medicament for treating toxic algae bloom in water is prepared from the following raw materials in parts by weight: 35 parts of potassium hydrogen persulfate; 15 parts of hydroxyethyl cellulose; 20 parts of benzoic acid; 5 parts of polyacrylamide; 15 parts of straw powder; 5 parts of oxalic acid; 4 parts of triethyl citrate; 2 parts of sodium dodecyl sulfate.

s1, preparing algicide green pellet particles: taking 40 parts of potassium hydrogen persulfate, 20 parts of hydroxyethyl cellulose, 20 parts of straw powder, 5 parts of oxalic acid and 25 parts of water, preparing wet granules by a wet mixing granulator, drying the wet granules to have moisture less than 5%, discharging, finishing the granules, and sieving the granules by a 5-16-mesh standard sieve to obtain granules with the particle size of 1-4 mm;

s2, preparing a coating mother solution: mixing 20 parts of benzoic acid, 5 parts of polyacrylamide, 4 parts of triethyl citrate, 2 parts of sodium dodecyl sulfate and 120 parts of water uniformly;

s3, coating and forming: forming a coating layer on the surface of the algicide green pellet prepared in the step S1 by using the coating mother liquor of the step S2 on a fluidized bed to obtain pellets with the diameter of 1-4mm, namely the self-floating composite medicament; fluidized bed process conditions: the feeding amount is 100g, the fan frequency is 25Hz, the air inlet temperature is 25 ℃, the atomization pressure is 0.2Mpa, the flow rate of the coating liquid is 1mL/min, and the coating time is 20min.

Example 3

A self-floating compound medicament for treating toxic algae bloom in water is prepared from the following raw materials in parts by weight: 45 parts of calcium peroxide; 20 parts of corn starch; 15 parts of benzoic acid; 5 parts of tyrosine; 10 parts of chitosan; 10 parts of plant ash; 10 parts of corncob powder; 4 parts of triethyl citrate; 2 parts of sodium dodecyl sulfate.

s1, preparing algicide green pellet particles: taking 45 parts of calcium peroxide, 20 parts of corn starch, 10 parts of plant ash, 10 parts of corncob powder and 30 parts of water, preparing wet granules by a wet mixing granulator, drying the wet granules to have moisture less than 5%, discharging, finishing the granules, and sieving the granules by a 5-16-mesh standard sieve to obtain granules with the particle size of 1-4 mm;

s2, preparing a coating mother solution: mixing 15 parts of benzoic acid, 5 parts of tyrosine, 10 parts of chitosan, 4 parts of triethyl citrate, 2 parts of sodium dodecyl sulfate and 100 parts of water uniformly;

Example 4

A self-floating compound medicament for treating toxic algae bloom in water is prepared from the following raw materials in parts by weight: 40 parts of calcium hypochlorite; 20 parts of sodium alginate; 3 parts of chitosan; 5 parts of hollow glass beads; 3 parts of sodium bicarbonate.

40 parts of calcium hypochlorite, 20 parts of sodium alginate and 3 parts of chitosan are taken; and (3) uniformly mixing 5 parts of hollow glass beads and 3 parts of sodium bicarbonate, then, pumping the mixture into a kneader, kneading for 30-45min, granulating the kneaded material by adopting an extrusion granulator, drying, screening, and obtaining particles with the diameter of 1-4mm by screening, thus obtaining the self-floating composite medicament.

Example 5

A self-floating compound medicament for treating toxic algae bloom in water is prepared from the following raw materials in parts by weight: 35 parts of magnesium peroxide; 15 parts of dextrin; 10 parts of chitosan; 10 parts of plant ash; sodium bicarbonate 1 part.

mixing 35 parts of magnesium peroxide, 15 parts of dextrin, 10 parts of plant ash and 1 part of sodium bicarbonate uniformly, then, pumping the mixture into a kneader for kneading for 30-45min, granulating the kneaded material by adopting an extrusion granulator, drying, screening, and obtaining particles with the diameter of 1-4mm by screening, thus obtaining the self-floating composite medicament.

In examples 4 and 5, the preferable treatment temperature is 50-75deg.C, which ensures that sodium bicarbonate can decompose to generate bubbles in the above process, and at the same time, the effective algae control component (algae control active substance) is not decomposed as much as possible, the raw material is puffed and lightened, and extrusion granulation is not suitable for temperature-sensitive algae control active substance (decomposition temperature is about 60deg.C and close to the decomposition temperature of puffing agent) because of easy decomposition.

In order to obtain the performance data of the self-floating composite reagent for treating toxic algae bloom in water, 3 parts of microcystis bloom floating on the surface of water in the open air are selected for experiments, one part of the self-floating composite potassium hydrogen persulfate algicide provided by the invention (the self-floating composite reagent prepared in the example 1) is added to correspond to the right-most test tube in the figure 1, the same amount of the self-floating and slow-release effect of the algicide raw ball particles prepared in the step one of the example 1 corresponds to the test tube in the middle of the figure 1, but the difficulty of being immersed by water after the surface is subjected to hydrophobic modification by the coating liquid is increased, the self-floating and slow-release capability is enhanced, the leftmost test tube in the figure 1 is a blank control (no reagent is added), and the result shown in the figure 1 is the effect of 2h after the test starts. As can be seen from FIG. 1, the floating type composite medicament provided by the invention can be fully contacted with the floating microcystis bloom on the surface of a water body, can accurately kill the harmful blue algae on the surface layer of the water body, and can continuously release potassium hydrogen persulfate in the gradual sinking process, so that algae control components exist in each layer above, in the middle and below a water column, and the harmful blue algae in the whole water column can be killed. When the algae control agent green pellets without floating performance are added into a water column, the algae control agent green pellets directly sink into the bottom, cannot fully contact with surface blue algae, only bottom blue algae bloom can be killed, the surface bloom still exists in a large quantity, and the algae killing effect is far inferior to that of a self-floating composite medicament.

In addition, the self-floating composite medicament prepared in example 2 is used as a test object (the corresponding legend in fig. 2 is an experimental group), the algae control agent raw ball particles which are prepared in the first step in example 2 and do not have floating capability are also used as test objects (the corresponding legend in fig. 2 is an original medicament group), and a blank control group (the corresponding legend in fig. 2 is a control group) is also arranged, so that compared with the control group, the content of phycocyanin in the experimental group is obviously reduced, and compared with the non-floating calcium peroxide raw ball, the floating calcium peroxide self-floating medicament has higher removal rate and better algae control effect on water bodies mainly comprising surface blue algae.

The potassium hydrogen persulfate prepared in example 2 is a self-floating composite medicament (containing 5 parts of oxalic acid) for effectively controlling algae components and also has the effect of removing soluble algae toxins in water columns. The self-floating composite medicament prepared in example 3 is used as a test object (corresponding legend in fig. 3 is an experimental group), and the algicide green pellet particles which are prepared in the first step in example 3 and do not have floating capability are also used as test objects (corresponding legend in fig. 3 is a raw pesticide group) relative to a blank control group (corresponding legend in fig. 3 is a control group), so that the self-floating composite medicament additionally comprises an organic acid (oxalic acid) component with a function of degrading the algicide, releases the algicide component and also releases oxalic acid at the same time, can effectively remove the original or harmful algicide released in the algae killing process after entering a water column, reduces the toxin level in the water column, and improves the quality of the water body.

The self-floating composite medicament prepared in example 3 is used as an effective algae control component and has the function of removing active phosphate ions in water columns, and the self-floating composite medicament prepared in example 3 is used as a test object (corresponding legend in fig. 4 is an experimental group), compared with a blank control group, the algae control agent in the embodiment is added with the calcium peroxide component, releases the algae control component and also releases calcium ions, can be combined with the active phosphate ions after entering a water body to passivate the phosphorus, and effectively removes the active phosphate ions in the water columns, so that the eutrophication of the water body is fundamentally improved, and the abnormal proliferation of blue algae is inhibited with lasting effect.

FIG. 5 shows the composition and abundance of phytoplankton in a natural water body to which the self-floating complex formulation of example 4 was added. Within 28 days, the blue algae ratio in the control group is reduced from the initial 91 to 88%, which is considered to be the natural death of a small amount of blue algae caused by lack of nutrition in the outdoor environment, while the blue algae ratio in the experimental group is reduced from the initial 94% to 38%, and the green algae ratio is increased from the initial 4% to 50%. Fig. 6 is a microscopic image of natural water added with self-floating composite agent particles (prepared in example 4). Wherein (a) and (b) represent microscopic images of the control algal samples observed on days 0 and 28, and (c) and (d) represent microscopic images of the experimental group (adding the self-floating algae-controlling particles prepared in example 4) observed on days 0 and 28. The control group is mainly blue algae after 28 days under the condition of no external drug interference; after the self-floating composite medicament particles are added, blue algae cells are damaged, and green algae dominate. The quantitative combination of phytoplankton and microscopic examination can prove that the blue algae in the water body still occupies 38 percent on the 28 th day of dosing, but the growth of the blue algae is obviously inhibited, most of damaged cells are occupied, the green algae occupies the main advantage, and the dominant algae in the water body is converted from the blue algae to the green algae.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

1. The self-floating composite medicament for treating toxic algae bloom in water is characterized by being prepared from the following raw materials in parts by weight: 35-45 parts of algae control active substances; 15-20 parts of adhesive; 0-20 parts of a hydrophobic modifier; 0-5 parts of organic acid; 3-10 parts of flocculant; 0-20 parts of light auxiliary materials; 0-3 parts of bulking agent; 0-6 parts of an anti-sticking agent.

2. The self-floating composite reagent for treating toxic algal bloom in a water body according to claim 1, wherein the algae-controlling active substance comprises temperature-sensitive powder and/or temperature-resistant powder, the temperature-sensitive powder is temperature-sensitive oxidant and/or Wen Minyi algicide, the temperature-sensitive oxidant is one or more of potassium hydrogen persulfate, potassium permanganate, potassium ferrate, sodium percarbonate, sodium perborate, calcium hypochlorite and sodium hypochlorite, the Wen Minyi algicide is one or more of natural products such as sanguinarine, gallic acid, prodigiosin and alfalfa, the temperature-resistant powder is temperature-resistant oxidant and/or temperature-resistant algistat, the temperature-resistant oxidant is one or two of calcium peroxide and magnesium peroxide, and the temperature-resistant algistat is one or more of copper sulfate, copper complex, quaternary ammonium salt, quaternary phosphonium salt and cationic polyamine.

3. The self-floating composite medicament for treating toxic algal bloom in water according to claim 2, which is characterized by being prepared from the following raw materials in parts by weight: 35-45 parts of temperature-sensitive powder; 15-20 parts of adhesive; 15-20 parts of a hydrophobic modifier; 0-5 parts of organic acid; 3-10 parts of flocculant; 15-20 parts of light auxiliary materials; 4-6 parts of an anti-adhesion agent.

4. The self-floating composite medicament for treating toxic algal bloom in water according to claim 2, which is characterized by being prepared from the following raw materials in parts by weight: 35-45 parts of temperature-resistant powder; 15-20 parts of adhesive; 0-5 parts of organic acid; 3-10 parts of flocculant; 5-10 parts of light auxiliary materials; 1-3 parts of bulking agent.

5. The self-floating composite medicament for treating toxic algal bloom in a water body according to claim 1, wherein the adhesive is one or more of polyethylene glycol, hydroxyethyl cellulose, sodium alginate, corn starch, dextrin, guar gum and xanthan gum.

6. The self-floating composite medicament for treating toxic algal bloom in a water body according to claim 1, wherein the hydrophobic modifier is one or two of benzoic acid and tyrosine.

7. The self-floating composite medicament for treating toxic algal bloom in a water body as recited in claim 1, wherein the organic acid is one or more of oxalic acid, pyruvic acid, tartaric acid and citric acid.

8. The self-floating composite medicament for treating toxic algal bloom in a water body according to claim 1, wherein the flocculant is one or more of chitosan, polyacrylamide, microbial polysaccharide and polyaluminium ferric sulfate chloride, the light material is one or more of corncob, straw powder, plant ash, activated carbon and hollow glass beads, and the bulking agent is sodium bicarbonate; the anti-sticking agent is triethyl citrate and sodium dodecyl sulfate.

9. The preparation method of the self-floating composite medicament for treating toxic algae bloom in water is characterized by comprising the following steps:

s2, preparing a coating mother solution: 15-20 parts of hydrophobic modifier, 3-10 parts of flocculant, 4-6 parts of anti-sticking agent and 100-120 parts of water are taken, and uniformly stirred and mixed to obtain the water-based paint;

10. The preparation method of the self-floating composite medicament for treating toxic algae bloom in water is characterized by comprising the following steps: