CN113860447A - Method for removing algae aiming at full life cycle of blue-green algae - Google Patents
Method for removing algae aiming at full life cycle of blue-green algae Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/30—Organic 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
- C02F2303/00—Specific treatment goals
- C02F2303/02—Odour removal or prevention of malodour
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Abstract
The invention discloses a method for removing algae aiming at the whole life cycle of blue-green algae, relates to the technical field of water treatment, and aims to solve the problems that the existing method for treating blue-green algae cannot give consideration to safety, high efficiency, low cost and simplicity, cannot meet the application requirement of large-area water body, and cannot prevent bloom outbreak in advance aiming at different life cycles of blue-green algae; the method comprises the steps of pretreating river and lake sludge or soil, calcining and grinding to obtain powder; in the blue algae biomass increasing stage and the floating gathering stage, the powder is added into a proper amount of positive charge reagent and is uniformly mixed, and the mixture is sprayed on the water surface by an aerosol generating device; in the recovery period of the blue algae, the powder is added into a proper amount of positive charge reagent and is uniformly mixed and thrown to the water surface; in the blue algae dormancy stage, powder is directly thrown until the powder covers the blue algae in the dormancy stage; the method has the advantages of simple operation, low cost of raw materials, easy acquisition, good safety, high speed of removing the blue algae and high removal rate, and can meet the application requirements.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a method for removing algae in a full life cycle of blue-green algae.
Background
In recent 20 years, as eutrophication of water bodies has increased, outbreaks of harmful algae in natural water bodies have become serious, and thus, the harmful algae have become environmental disasters which are spotlighted all over the world. The excessive water bloom algae seriously worsen the water quality, influence the functions of the water body such as ecology, agriculture and landscape, and even threaten the safety of drinking water. The research and development of safe, efficient and cheap water bloom control technology not only has important scientific significance internationally, but also is one of the major environmental problems to be solved urgently by the water environment in China at present.
At present, a set of safe, efficient, cheap and simple water bloom comprehensive treatment integrated technology, especially the aspect of blue algae emergency disposal, still does not exist in the market. When the water bloom pollution area is huge and due to the limitation of efficiency/cost, intermittent and sudden water bloom pollution cannot be responded by everywhere construction projects, in-situ removal of the water bloom pollution and conversion of the water bloom pollution into promotion factors beneficial to water environment ecology through a natural biogeochemical process can be a strategic research direction. Because the water environment treatment cost is huge, how to scientifically, effectively and accurately treat the water environment is one of important research directions for environmental protection in the future.
The invention discloses an invention patent application with publication number CN105130006A and name 'a blue algae removal method', wherein a method for extracting a mixed solution of blue algae toxin and an extract of viscera and tissues of bighead carps eating algae from blue algae to mildew, culturing the mildewed mixed solution, and extracting a mold solution to treat blue algae in a river channel to achieve the purpose of removing the blue algae is disclosed, the method has high safety, but the preparation process is complex, the preparation and culture time is long, and the death rate of the algae is only 85% at most after 3 days of the embodiment, so that the effect is limited.
The publication number is CN107098502A, which is named as 'a method for removing blue algae in water based on pH value adjustment of water', wherein the invention discloses a method for removing the blue algae by directly promoting flocculation and precipitation of the blue algae by using acid and alkali to adjust the pH of water, which has the advantages of quick effect, simple operation, no generation of new pollution, low cost and the like, but the adjustment process can affect other animals and plants in the water, the ecological balance is destroyed, and a large amount of reagents are consumed for acid-base adjustment of a large area of water, so that the practical application is difficult.
The existing methods for treating the blue algae cannot give consideration to safety, high efficiency, low cost and simplicity, cannot meet the application requirement of large-area water body, and cannot prevent bloom outbreak in advance aiming at different life cycles of the blue algae; therefore, a method for removing algae in the whole life cycle of blue algae is needed to solve the problem.
Disclosure of Invention
The invention aims to provide a method for removing algae in a full life cycle of blue-green algae, and aims to solve the problems that the existing method for treating blue-green algae cannot give consideration to safety, high efficiency, low cost and simplicity, cannot meet the application requirements of large-area water bodies, and cannot prevent bloom outbreak in advance in different life cycles of the blue-green algae.
In order to achieve the purpose, the invention provides the following technical scheme: a method for removing algae aiming at the whole life cycle of blue algae comprises the following steps:
s1, pretreating river and lake sludge or soil, calcining and grinding to obtain powder;
s2, treating the water body by using the powder obtained in the step S1 according to different life cycles of blue algae in the water body; in the blue algae biomass increasing stage and the floating gathering stage, the powder is added into a proper amount of positive charge reagent and is uniformly mixed, and the mixture is sprayed to the water surface by an aerosol generating device; in the recovery period of the blue algae, the powder is added into a proper amount of positive charge reagent and is uniformly mixed and thrown to the water surface; and in the blue algae dormancy stage, the powder is directly thrown until the powder covers the blue algae in the dormancy stage.
Preferably, in step S1, the preparation process of the powder specifically includes: drying and oxidizing river and lake sludge or soil; then putting the mixture into an ultrasonic pool for ultrasonic treatment for 24-72 h; calcining at 450-660 ℃ for 4-10 h; cooling to normal temperature, and grinding at low speed.
Preferably, the powder is sieved by a sieve of 80-200 meshes, the sieved material is powder A, the sieved material is sieved by a sieve of 20-80 meshes, and the sieved material is powder B; in step S2, the powder a and the powder B are used sequentially or simultaneously.
Preferably, in the step S2, the ratio of the biomass of cyanobacteria in the increasing step and the floating accumulation step is set to w/v of 3: adding the powder into a positive charge reagent at a concentration of 25kg/L, uniformly mixing, and spraying the mixture onto the water surface by using an aerosol generating device, wherein a spraying port is positioned 15-300cm above the water surface.
Preferably, in step S2, in the cyanobacteria recovery period, the ratio of the powder and the positive charge reagent w/v is 3: on the basis of 25kg/L, the powder proportion is reduced by 20-40%, the positive charge reagent proportion is increased by 20-40%, and the powder is added into the positive charge reagent and uniformly mixed into a suspension and is thrown onto the water surface.
Preferably, in step S2, the blue algae in the dormant period is covered by the thrown powder, and the covering thickness is not less than 1 cm.
Preferably, when the powder and the positive charge agent are mixed, the ratio of the powder a to the powder B is 1: 2.
Preferably, when the powder is used alone, the ratio of the powder A to the powder B is 1:2, and the powder A is thrown first, and after about 10-60min, the powder B is thrown.
Preferably, the powder is used for flocculating/removing one or more of algae, nutritive salts, particulate matter, organic matter and smelly substances in water.
Preferably, the positive charge reagent is prepared by adding chitosan into a dilute hydrochloric acid solution with the concentration of 1-5%, wherein the concentration of the chitosan is 0.1-2 mg/L; the powder and the positive charge reagent are prepared at present, and the dosage is positively correlated with the water volume and the algae concentration.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for removing algae aiming at the whole life cycle of the blue algae is simple to operate, low in raw material cost, easy to obtain, good in safety, high in blue algae removal speed and high in removal rate, can not bring new pollutants into water, can treat nutritive salt, granular substances, organic matters, smelly substances and the like, is remarkably helpful for improving water quality, and can meet the requirements of practical application.
2. The method for removing algae in the whole life cycle of the blue algae adopts more effective proportioning and treatment modes aiming at different life cycles of the blue algae, accurately removes the algae, can reduce waste and achieves the purposes of cost reduction and efficiency improvement.
3. The method for removing algae aiming at the full life cycle of the blue algae can utilize river and lake sludge as resources; dredging is still one of the important measures for river and lake treatment and ensuring the smoothness of a river channel, is a complex and systematic project, wherein the treatment of sludge is an important part, the sludge belongs to engineering waste in essence, and the resource utilization of the sludge is considered as far as possible according to the principles of reduction, harmlessness and resource utilization of solid waste treatment, so the method also has the advantage of environmental friendliness.
Detailed Description
A method for removing algae aiming at the whole life cycle of blue algae comprises the following steps:
s1, drying and oxidizing river and lake sludge or soil; then putting the mixture into an ultrasonic pool for ultrasonic treatment for 24-72 h; calcining at 450-660 ℃ for 4-10 h; cooling to normal temperature, and grinding at low speed; in a preferred embodiment, the powder is sieved by a sieve of 80-200 meshes, the sieved material is taken as powder A, the sieved material is sieved by a sieve of 20-80 meshes, and the sieved material is taken as powder B; when the powder is used, the powder A and the powder B are used sequentially or simultaneously;
s2, treating the water body by using the powder obtained in the step S1 according to different life cycles of blue algae in the water body; wherein blue alga biomass increases stage and come-up gathering stage, adds the powder and mixes in adding right amount of positive charge reagent, utilizes aerosol generating device to spray to the surface of water on, and is optional, according to w/v 3: adding the powder into a positive charge reagent at a concentration of 25kg/L, uniformly mixing, and spraying the mixture onto the water surface by using an aerosol generating device, wherein a spraying port is positioned 15-300cm above the water surface; in the blue algae recovery period, the powder is added into a proper amount of positive charge reagent and is uniformly mixed and thrown to the water surface, and optionally, the ratio of the powder to the positive charge reagent w/v is 3: on the basis of 25kg/L, the powder proportion is reduced by 20-40%, the positive charge reagent proportion is increased by 20-40%, and the powder is added into the positive charge reagent and uniformly mixed into a suspension and is thrown onto the water surface; in the blue algae dormancy stage, powder is directly thrown until the powder covers the blue algae in the dormancy stage, and the covering thickness is not less than 1 cm; in the preferred embodiment, the powder is sieved into powder A and powder B, the ratio of powder A to powder B is preferably 1:2 when the powder is mixed with the positive charge agent, the ratio of powder A to powder B is preferably 1:2 when the powder is used alone, and the powder A is thrown first for about 10-60min and then the powder B is thrown.
In addition, the positive charge reagent can be chitosan added into a dilute hydrochloric acid solution with the concentration of 1-5%, wherein the concentration of the chitosan is 0.1-2mg/L, and the positive charge reagent can also be other reagents capable of introducing positive charges, such as reagents containing sodium alginate and chitin; the powder and the positive charge reagent are prepared at present, and the dosage is positively correlated with the water volume and the algae concentration.
The powder in the method can be used for removing nutrient salts such as nitrogen and phosphorus, wrapping and settling algae such as blue algae, flocculating and precipitating granular substances and removing organic matters, and the aerosol generator is used for spraying aerosol on the water surface to prevent odor substances from dissipating and remove the odor substances.
Example 1
This example was carried out in the laboratory, in which summer the blue algae proliferated in large areas, and belongs to the stage of floating and gathering of blue algae and the outbreak period. Taking a city river water sample rich in blue algae, determining that the concentration of chlorophyll a is 1.5423 mug/L, the total phosphorus is 0.48mg/L, the concentration of ammonia nitrogen is 2.8mg/L, and simultaneously monitoring hydrogen sulfide (H)2The concentrations of S), dimethyldisulfide (DMDS), diethyldisulfide (DEDS), amylsulfide (DAS) and propylsulfide (DPS) were 210, 113, 91, 52 and 37ng/L, respectively; the above samples were equally divided into sample one and sample two.
Taking the desilted sludge of the lake and the river on the Maanshan as a raw material, and carrying out drying treatment and oxidation treatment; then putting the mixture into an ultrasonic pool for ultrasonic treatment for 24 hours; calcining at 500 ℃ for 6 h; cooling to normal temperature, and grinding at low speed to obtain powder.
Before use, according to w/v-3: adding 25kg/L of powder into a positive charge reagent, uniformly mixing, continuously spraying the uniformly mixed liquid onto the water surface of the first sample by using an aerosol generating device according to the addition amount of 0.15ml/L of the volume of the water body, and observing that the spray opening is positioned 20cm above the water surface and is in mist-shaped dispersion distribution on the water surface, and the aerosol is not easy to diffuse upwards; and naturally placing the second sample without treatment.
After 2H, the chlorophyll a concentration in the sample I is 0.00025 mu g/L, the algae removal rate reaches more than 99 percent, the total phosphorus is 0.001mg/L, the ammonia nitrogen concentration is 0.2mg/L, and hydrogen sulfide (H) is detected2The concentrations of S), dimethyldisulfide (DMDS), diethyldisulfide (DEDS), amylsulfide (DAS) and propylsulfide (DPS) were 125, 47, 16, 15 and 15ng/L, respectively; in sample II, the chlorophyll a concentration is 1.5539 mu g/L, the total phosphorus is 0.48mg/L, the ammonia nitrogen concentration is 2.3mg/L, and hydrogen sulfide (H)2The concentrations of S), dimethyldisulfide (DMDS), diethyldisulfide (DEDS), amylsulfide (DAS) and propylsulfide (DPS) were 192, 101, 86, 33 and 29ng/L, respectively. The aerosol generating device is proved to be capable of achieving better effects of removing algae and phosphorus and removing odor substances in summer.
Example 2
This example was carried out in two 80 square meters of polder in north lake of Maanshan, respectively (test area A, test area B), and the water volume was about 150 square. In the middle ten days of 2 months, the continuous blue-green algae outbreak in the north lake in summer can be concluded that a large amount of overwintering dormant blue-green algae exist in the surface sediment, the blue-green algae with less concentration is suspended in the water body, the chlorophyll concentration is 0.767 mug/L, the total phosphorus is 0.32mg/L, and the ammonia nitrogen concentration is 2.6 mg/L.
Taking the desilted sludge of the lake and the river on the Maanshan as a raw material, and carrying out drying treatment and oxidation treatment; then putting the mixture into an ultrasonic pool for ultrasonic treatment for 30 hours; calcining at 600 ℃ for 4 h; cooling to normal temperature, and grinding at low speed to obtain powder.
In test area a according to the positive charge reagent: powder v/w 25: 3, throwing the polder into lake water rich in blue algae in an addition amount of 0.05ml/L in water; only the powder is thrown in the test area B synchronously, and the throwing amount is equal to that of the powder used in the test area A.
And (3) the blue algae can be seen by naked eyes in both the test areas to sink immediately, and after 2 hours, water samples of the test area A and the test area B are respectively taken to obtain the test area A: the chlorophyll a concentration is 0.00981 mug/L, the algae removal rate is more than 98 percent, the total phosphorus is 0.001mg/L, and the ammonia nitrogen concentration is 1.3 mg/L; test zone B: the chlorophyll a concentration is 0.01112 mug/L, the algae removal rate is more than 98 percent, the total phosphorus is 0.001mg/L, and the ammonia nitrogen concentration is 1.1 mg/L.
Example 3
The method is carried out in a small pond rich in blue-green algae near the northwest road of a lake in Maanshan city, the total area of the pond is about 100 square meters, the pond is artificially divided into two parts (a test area A and a test area B) with about the same area, and the water body is about 100 square meters. The experimental time is 1 month later, at the moment, the blue algae are in the positive blue algae overwintering dormant period, the blue algae are easy to burst after the temperature of the pond is increased year by year, and the fact that a large amount of overwintering dormant blue algae exist in surface sediments can be judged, at the moment, in winter, the total phosphorus is 0.73mg/L, and the ammonia nitrogen concentration is 4.96 mg/L.
Taking the desilted sludge of the lake and the river on the Maanshan as a raw material, and carrying out drying treatment and oxidation treatment; then putting the mixture into an ultrasonic pool for ultrasonic treatment for 36 hours; calcining at 550 ℃ for 10 h; cooling to normal temperature, and grinding at low speed to obtain powder; the powder is firstly screened by a 200-mesh sieve, the screened material is taken as powder A, the screened material is screened by a 80-mesh sieve, and the screened material is taken as powder B.
In test zone a as powder a: the powder B is 1:2, the addition amount is 330 g/direction, and the powder B is uniformly thrown into the pond. Firstly, the powder A is thrown, and after about 10-60min, the powder B is thrown. Test zone B did not take any action. To ensure minimal interference in the test, the location closer to the company is chosen for inspection.
The blue algae density in the test area A can be directly observed to be smaller than that in the test area B in 6-8 months in the current year, and the laboratory is sampled for detection, and the test area A is as follows: chlorophyll a concentration 0.413 μ g/L, assay zone B: chlorophyll a concentration is 0.661 μ g/L, the difference in chlorophyll a concentration is about 38%; the method for removing algae in the whole life cycle of the blue algae has a certain function of preventing the blue algae from outbreak.
Example 4
This example was carried out in two 80 square meters of polder in north lake of Maanshan, respectively (test area A, test area B), and the water volume was about 150 square. The experimental time is 4 late-month, at the time of the recovery period of the blue-green algae, the suspended blue-green algae in the water body gradually increase, the water color turns green visible to naked eyes, the chlorophyll concentration is 1.967 mu g/L, the total phosphorus is 0.37mg/L, and the ammonia nitrogen concentration is 3.2 mg/L.
Taking the desilted sludge of the lake and the river on the Maanshan as a raw material, and carrying out drying treatment and oxidation treatment; then putting the mixture into an ultrasonic pool for ultrasonic treatment for 36 hours; calcining at 550 ℃ for 10 h; cooling to normal temperature, and grinding at low speed to obtain powder; the powder is firstly screened by a 200-mesh sieve, the screened material is taken as powder A, the screened material is screened by a 80-mesh sieve, and the screened material is taken as powder B.
In test area a according to the positive charge reagent: powder v/w 25: 3, wherein the powder A: the powder B is 1:2, the positive charge reagent is chitosan added into a 1-5% dilute hydrochloric acid solution, wherein the concentration of the chitosan is 1mg/L, and the chitosan is thrown into lake water which is separated by the polder and is rich in blue algae by 0.05ml/L in water; in synchronization with the positive charge reagent in test zone B: powder v/w 25: 2, powder A: the powder B is 1:2, and the chitosan content of the positive charge reagent is reduced by 40%.
The blue algae can be seen by naked eyes to sink immediately in the test area A and the test area B, and water samples are respectively taken after 2 hours to measure the test area A: the chlorophyll a concentration is 0.00671 mug/L, the total phosphorus is 0.002mg/L, and the ammonia nitrogen concentration is 1.4 mg/L; test zone B: the chlorophyll a concentration is 0.00512 mug/L, the total phosphorus concentration is 0.001mg/L, the ammonia nitrogen concentration is 1.3mg/L, the difference between the two is small, and the using amount can be saved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
The present invention is not described in detail, but is known to those skilled in the art.
Claims (10)
1. A method for removing algae aiming at the whole life cycle of blue algae is characterized by comprising the following steps:
s1, pretreating river and lake sludge or soil, calcining and grinding to obtain powder;
s2, treating the water body by using the powder obtained in the step S1 according to different life cycles of blue algae in the water body; in the blue algae biomass increasing stage and the floating gathering stage, the powder is added into a proper amount of positive charge reagent and is uniformly mixed, and the mixture is sprayed to the water surface by an aerosol generating device; in the recovery period of the blue algae, the powder is added into a proper amount of positive charge reagent and is uniformly mixed and thrown to the water surface; and in the blue algae dormancy stage, the powder is directly thrown until the powder covers the blue algae in the dormancy stage.
2. The method for removing algae for the full life cycle of blue-green algae according to claim 1, wherein in the step S1, the preparation process of the powder specifically comprises: drying and oxidizing river and lake sludge or soil; then putting the mixture into an ultrasonic pool for ultrasonic treatment for 24-72 h; calcining at 450-660 ℃ for 4-10 h; cooling to normal temperature, and grinding at low speed.
3. The method for removing algae in the whole life cycle of blue-green algae according to claim 1, wherein the method comprises the following steps: the powder is firstly sieved by a sieve of 80-200 meshes, the sieved material is taken as powder A, the sieved material is sieved by a sieve of 20-80 meshes, and the sieved material is taken as powder B; in step S2, the powder a and the powder B are used sequentially or simultaneously.
4. The method for removing algae in the whole life cycle of blue-green algae according to claim 1, wherein the method comprises the following steps: in the step S2, the blue algae biomass increasing stage and the floating accumulation stage are performed in a w/v-3: adding the powder into a positive charge reagent at a concentration of 25kg/L, uniformly mixing, and spraying the mixture onto the water surface by using an aerosol generating device, wherein a spraying port is positioned 15-300cm above the water surface.
5. The method for removing algae in the whole life cycle of blue-green algae according to claim 1, wherein the method comprises the following steps: in the step S2, in the blue algae recovery period, the ratio of powder and positive charge reagent w/v is 3: on the basis of 25kg/L, the powder proportion is reduced by 20-40%, the positive charge reagent proportion is increased by 20-40%, and the powder is added into the positive charge reagent and uniformly mixed into a suspension and is thrown onto the water surface.
6. The method for removing algae in the whole life cycle of blue-green algae according to claim 1, wherein the method comprises the following steps: in the step S2, in the dormancy stage of the blue algae, the thrown powder covers the blue algae in the dormancy stage, and the covering thickness is not less than 1 cm.
7. The method for removing algae for the full life cycle of blue-green algae according to claim 3, wherein the method comprises the following steps: when the powder is mixed with the positive charge reagent, the ratio of the powder A to the powder B is 1: 2.
8. The method for removing algae for the full life cycle of blue-green algae according to claim 3, wherein the method comprises the following steps: when the powder is used alone, the ratio of the powder A to the powder B is 1:2, and the powder A is thrown firstly, and the powder B is thrown after about 10-60 min.
9. The method for removing algae in the whole life cycle of blue-green algae according to claim 1, wherein the method comprises the following steps: the powder is used for flocculating/removing one or more of algae, nutritive salt, granular substances, organic matters and smelly substances in water.
10. The method for removing algae in the whole life cycle of blue-green algae according to claim 1, wherein the method comprises the following steps: the positive charge reagent is prepared by adding chitosan into a dilute hydrochloric acid solution with the concentration of 1-5%, wherein the concentration of the chitosan is 0.1-2 mg/L; the powder and the positive charge reagent are prepared at present, and the dosage is positively correlated with the water volume and the algae concentration.
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| CN115159766A (en) * | 2022-05-16 | 2022-10-11 | 中冶华天工程技术有限公司 | Method for synchronously recovering water environment by removing algae |
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