CN115417564A - Water bloom polluted water body remediation method - Google Patents
Water bloom polluted water body remediation method Download PDFInfo
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- CN115417564A CN115417564A CN202211228976.5A CN202211228976A CN115417564A CN 115417564 A CN115417564 A CN 115417564A CN 202211228976 A CN202211228976 A CN 202211228976A CN 115417564 A CN115417564 A CN 115417564A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B15/00—Cleaning or keeping clear the surface of open water; Apparatus therefor
- E02B15/04—Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
- E02B15/08—Devices for reducing the polluted area with or without additional devices for removing the material
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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
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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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
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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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
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
Abstract
The invention discloses a method for restoring water bloom polluted water body, which comprises the following steps: blue algae is enriched and intercepted through a soft enclosure, so that the blue algae enters an enrichment area, and a phosphorus removal material is hung and put in the enrichment area; sucking floating algae cells in the enrichment area into a bypass algae cell flocculation area, adding a magnetic flocculant into a polluted water body in the flocculation area, stirring, precipitating magnetic mixture floccules formed by the algae cells in situ, sucking the precipitated floccules through a bottom suction pipe, dewatering, performing subsequent treatment, and returning the treated water to a downstream remediation area of the original polluted water body; the downstream restoration area is provided with a lake purifier as a core and is assisted by emergent aquatic plants to realize nitrogen and phosphorus removal and carbon removal.
Description
Technical Field
The invention relates to the technical field of blue algae treatment, and particularly relates to a method for restoring a water body polluted by water bloom.
Background
Blue-green algae, also known as blue-green algae or cyanobacteria, is the most widely distributed photoautotrophic organism with the strongest adaptability on the earth. The blue-green algae outbreak is a phenomenon that algae mainly containing blue-green algae rapidly grows and breeds to reach a certain density under the conditions of water eutrophication and other suitable habitats and lack of interspecific competition, and is gathered on a certain water surface in a large range to be visible. Blue algae has algal toxins, and the continuous explosion and accumulation of the blue algae can generate odor and black water, thereby affecting the safe water supply of water source places, the survival of aquatic animals, the quality of water environment and the living environment of human beings and scenic tourism.
The blue algae eruption can absorb a large amount of nitrogen and phosphorus substances in water, and if the blue algae is removed in time, the water body can be effectively cleaned, but manual or mechanical fishing is high in cost and low in efficiency; the flocculation precipitation time is long, the flocculation precipitation is easy to be disturbed by water flow, and the bottom sludge pollution is increased; the magnetic capture ship is high in cost and suitable for large water area. The method has the advantages that the algae cells are treated by the bypass, so that the water quality of a local water area is obviously improved, nitrogen, phosphorus and other organic matters are prevented from entering the sediment, the risk of pollution such as N, P released by the sediment is reduced, the growth of microorganisms and aquatic plants is promoted by removing phosphorus materials and aquatic plants and providing media and conditions for the growth and the propagation of indigenous microorganisms while blue algae are removed, the variety of species is enriched, the habitat of other various aquatic organisms is improved, and the situation that lake blue algae occupy absolute advantages is broken. The blue algae is removed fundamentally, secondary algae outbreak is avoided, and the algae removal cost is reduced.
Disclosure of Invention
The invention aims to solve the problems of the background technology and provides a method for restoring water body polluted by water bloom, wherein a single physical, chemical or biological method can play a certain removing effect to different degrees but cannot prevent the blue algae from relapse; aiming at the defects in the prior art, the invention aims to provide a method which has low cost, avoids secondary outbreak of algae, reduces bottom sediment pollution while removing blue algae and reducing the nitrogen and phosphorus concentration of a water body, enriches species diversity, and also provides landscaping while enhancing the self-cleaning capacity of the water body.
The purpose of the invention can be realized by the following technical scheme:
a method for restoring water bloom polluted water body comprises the following steps:
step 1: blue algae is enriched and intercepted through a soft enclosure, so that the blue algae enters an enrichment area, and a phosphorus removal material is hung and put in the enrichment area;
step 2: sucking floating algae cells in the enrichment region into a bypass algae cell flocculation region, adding a magnetic flocculant into a polluted water body in the flocculation region, stirring, precipitating magnetic mixture floccules formed by the algae cells in situ, sucking the precipitated floccules out through a bottom suction pipe, dewatering, performing subsequent treatment, and returning the treated water to a downstream restoration region of the original polluted water body;
and step 3: the downstream restoration area is provided with a lake purifier as a core and is assisted by emergent aquatic plants, and sewage flowing through the restoration area is further decomposed and absorbed by micromolecular organic matters under the combined action of microorganisms and aquatic plants, so that nitrogen and phosphorus removal and carbon removal are realized.
As a further scheme of the invention: in the step 1, the enclosure is a soft enclosure and extends into the water by 20-40cm, and the moving speed of the blue algae enriched by the soft enclosure is 5-10m/min.
As a further scheme of the invention: in the step 1, the phosphorus removal material is prepared from cement, fly ash, gypsum powder, slag powder and a foaming agent (aluminum powder) according to the mass percentage of 13-15%:45-55%:13-15%:10-15%:0.05-0.1% of aerated concrete.
As a further scheme of the invention: in step 2, the flocculant is one or a combination of PAC, PAM and magnetic flocculant.
As a further scheme of the invention: in the step 2, the flocculating agent is a magnetic flocculating agent and is prepared from a magnetic material, a coagulant and a coagulant aid according to the mass percentage of 25-35%:45-55%:10-15% of the total weight of the composition.
As a further scheme of the invention: in the step 2, the adding amount of the flocculating agent is 0.5-3t/km 3 。
As a further scheme of the invention: the soft enclosure is characterized in that the lower fence and the upper fence are connected with each other through a connecting frame, the connecting frame is connected through an automatic folding mechanism, and the automatic folding mechanism controls the upper fence to turn over.
As a further scheme of the invention: the turning angle of the upper fence is 0-180 degrees.
As a further scheme of the invention: the automatic folding mechanism comprises a sliding rod, one end of the sliding rod is connected with the power plate, the other end of the sliding rod is connected with a positioning pin, a spring is sleeved on the sliding rod, and the positioning pin is connected with an upper fence in a buckling mode.
As a further scheme of the invention: the rail passes through torsional spring with last rail down and connects, and the power supply of power board is: along with the accumulation of the blue algae, when the blue algae reaches the position of the power plate, the blue algae will act on the power plate under the action of the pulling force.
The invention has the beneficial effects that:
the method combines physical, chemical and biological repair technologies, so that sediment burden is not increased while algae cells are removed and water is cleaned, and the removal rate of the algae cells reaches over 90%; the phosphorus removal material further reduces the phosphorus content of the water body to inhibit the growth of algae cells and prevent secondary outbreak, and the total phosphorus removal rate is not lower than 80 percent; the contact oxidation film process and the construction of the aquatic plants increase the ecological diversity, improve the self-purification capacity of the water body, and further purify the water quality through the growth and absorption of the aquatic plants, the metabolism of microorganisms and the nitrification and denitrification. The cold-resistant plant biological pond can be constructed in the idle flocculation sedimentation tank in autumn and winter, so that certain landscape benefits are brought while the water quality is purified;
the first connecting frame and the second connecting frame are connected with each other through an automatic folding mechanism; through the enclosure subassembly that rail and last rail are constituteed down, can improve the volume of intercepting the blue alga effectively, avoid because at the interception in-process, the blue alga quantity is many, surpasss the top surface of rail down to make and to intercept other unnecessary blue alga, thereby only intercept the blue alga operation to the surface of water again, increased the problem of work load.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a schematic view of the construction of the flexible enclosure of the present invention;
FIG. 3 is a schematic view of a first connecting frame according to the present invention;
FIG. 4 is a schematic structural diagram of the connection relationship between the first connecting frame and the second connecting frame according to the present invention;
FIG. 5 is a schematic structural view of the automatic folding mechanism of the present invention;
fig. 6 is an enlarged partial schematic view of the invention at a in fig. 5.
In the figure: 1. a lower fence; 2. a first connecting frame; 3. a second link frame; 4. an upper fence; 5. a lower connecting rod; 6. a support bar; 7. an upper connecting rod; 8. a protective net; 9. a slide bar; 10. positioning pins; 11. a spring; 12. a power plate; 13. a connecting shaft; 14. a clamping block; 15. a card slot; 16. and a compensation plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
Example 1
Referring to fig. 1, the present invention is a method for restoring water body polluted by water bloom, comprising the following steps:
step 1: through the gathering and intercepting of blue algae by the soft enclosure, on one hand, the reasonable flowing of the blue algae is guided, the blue algae is gathered in the water area with favorable shape, the concentration of the blue algae is improved, the efficiency of fishing the blue algae is improved, on the other hand, the blue algae is blocked, and a large amount of blue algae does not enter important water areas.
Step 2: through the action of the soft enclosure, the blue algae enters the enrichment area, and the phosphorus removal material is hung and put in the enrichment area, so that the phosphorus content of the water body is reduced, and the growth of algae cells is also inhibited.
And step 3: sucking floating algae cells in the enrichment region into a bypass algae cell flocculation region, adding a magnetic flocculant into a polluted water body in the flocculation region, stirring, precipitating magnetic mixture floccules formed by the algae cells in situ, sucking the precipitated floccules through a bottom suction pipe after certain accumulation, dewatering, performing subsequent treatment, and returning the treated water to a downstream remediation region of the original polluted water body.
And 4, step 4: a contact oxidation film process taking a lake purifier as a core is arranged in a downstream restoration area, emergent aquatic plants are planted, and small molecular organic matters are further decomposed and absorbed under the combined action of microorganisms and aquatic plants in sewage flowing through the restoration area, so that nitrogen and phosphorus removal and carbon removal are realized.
In the step 1, the enclosure is a soft enclosure and extends into the water by 20-40cm, and the moving speed of the blue algae enriched by the soft enclosure is 5-10m/min.
In the step 2, the phosphorus removal material is prepared from cement, fly ash, gypsum powder, slag powder and a foaming agent (aluminum powder) according to the mass percentage of 13%:45%:13%:10%:0.05% of aerated concrete;
the phosphorus removal material can be in a filter dam form, a suspension form, an overflow form or a side slope laying form, and can effectively absorb phosphate in a water body, so that the aim of removing phosphorus is fulfilled. The total phosphorus removal rate is not lower than 80%;
in the step 3, the flocculating agent is one or a combination of PAC, PAM and magnetic flocculating agent; the flocculant is a magnetic flocculant and is prepared from a magnetic material, a coagulant and a coagulant aid, wherein the mass percentage of the flocculant is as follows: 45%:10% of the total weight of the composition; the dosage of the magnetic flocculating agent is 0.5-3t/km 3 The algae cell removal rate reaches over 90 percent;
in the step 4, the ecological restoration area adopts a contact oxidation film treatment process taking a lake purifier as a core, and is supplemented with planting emergent aquatic plants such as canna, iris, thaliana, celandine and the like and submerged plants such as tape grass, waterweed, black wheel algae, watermifoil and the like. Under the combined action of microorganisms and aquatic plants, the water quality of the sewage after the flocculation and precipitation of the algae cells is further improved, the stability of an ecological system is enhanced, the self-purification capacity of the water body is enhanced, and the secondary outbreak of blue algae is inhibited.
Example 2
The difference from the above embodiment 1 is that: the phosphorus removal material is prepared from cement, fly ash, gypsum powder, slag powder and a foaming agent (aluminum powder) according to the mass percentage of 14%:50%:14%:12%:0.08% of aerated concrete;
the flocculating agent is one or a combination of PAC, PAM and magnetic flocculating agent; the flocculant is a magnetic flocculant and is prepared from a magnetic material, a coagulant and a coagulant aid, wherein the mass percentage of the flocculant is 30%:50%:12% of the total weight of the composition.
Example 3
The difference from the above embodiment 1 is that: the phosphorus removal material is prepared from cement, fly ash, gypsum powder, slag powder and a foaming agent (aluminum powder) according to the mass percentage of 15%:55%:15%:15%:0.1% of aerated concrete;
the flocculant is one or a combination of PAC, PAM and magnetic flocculant; the flocculant is a magnetic flocculant and is prepared from a magnetic material, a coagulant and a coagulant aid according to the mass percentage of 35%:55%:15% of the total weight of the composition.
Example 4
Referring to fig. 2-6, based on the above embodiments 1-3, when the soft enclosure intercepts the blue-green algae, the structure cannot be changed, so that the volume of the soft enclosure is fixed, and a large amount of blue-green algae is contained on different water surfaces, and when the soft enclosure cannot bear the load, the soft enclosure needs to be reused by a worker for intercepting, so that the problem that the blue-green algae is inconvenient to intercept and the remediation efficiency of a polluted water body is affected exists;
the improved soft enclosure comprises a lower fence 1, a first connecting frame 2, a second connecting frame 3, an upper fence 4 and a protective net 8;
the lower fence 1 is arranged at the bottom of the first connecting frame 2, the second connecting frame 3 is arranged on the first connecting frame 2, and the upper fence 4 is arranged at the top of the second connecting frame 3; the first connecting frame 2 and the second connecting frame 3 are connected with each other through an automatic folding mechanism; the enclosure assembly consisting of the lower fence 1 and the upper fence 4 can effectively improve the volume for intercepting the blue-green algae, and avoid the problem that in the process of interception, the number of the blue-green algae is large and exceeds the top surface of the lower fence 1, so that other redundant blue-green algae cannot be intercepted, and only the operation of intercepting the blue-green algae on the water surface is carried out, so that the workload is increased;
the first connecting frame 2 and the second connecting frame 3 are identical in structure and respectively comprise a lower connecting rod 5, a supporting rod 6 and an upper connecting rod 7, the second connecting frame 3 is arranged above the first connecting frame 2, and the first connecting frame 2 is rotatably connected with the second connecting frame 3 through a connecting shaft 13;
the shapes of the lower connecting rod 5 and the upper connecting rod 7 are the same as those of the lower fence 1 and the upper fence 4, and both the lower connecting rod 5 and the upper connecting rod 7 are of a semi-arc or semi-polygonal structure, the lower connecting rod 5 is arranged below the upper connecting rod 7, the lower connecting rod 5 is connected with the upper connecting rod 7 through the supporting rod 6, a protective net 8 is sleeved at the interval between the lower connecting rod 5 and the upper connecting rod 7, and the protective net 8 can prevent part of blue-green algae from overflowing from the gap between the lower connecting rod 5 and the upper connecting rod 7 when the blue-green algae are intercepted, so that the efficiency of intercepting the blue-green algae is influenced;
the automatic folding mechanism comprises a sliding rod 9, a positioning pin 10, a spring 11, a power plate 12, a connecting shaft 13, a clamping block 14, a clamping groove 15 and a compensation plate 16;
the lower connecting rod 5 of the sliding rod 9 penetrates through the bottom of the first connecting frame 2, one end of the sliding rod 9 is connected with the power plate 12, the other end of the sliding rod 9 is connected with the positioning pin 10, the sliding rod 9 is sleeved with the spring 11, one end of the spring 11 is connected with the power plate 12, the other end of the spring 11 is connected with the lower connecting rod 5, and the positioning pin 10 is in buckling connection with the lower connecting rod 5 at the bottom of the second connecting frame 3;
a torsion spring is sleeved on a connecting shaft 13 connected with the first connecting frame 2 and the second connecting frame 3, so that the second connecting frame 3 can automatically turn over under the action of the torsion spring;
the height of the first connecting frame 2 is greater than that of the second connecting frame 3, the first connecting frame 2 is matched with the height of the second connecting frame 3, so that the bottom of the second connecting frame 3 can be acted by the automatic folding mechanism, when the sliding rod 9 is moved, the positioning pin 10 can be separated from the second connecting frame 3, the second connecting frame 3 can automatically turn upwards under the action of the torsion spring, the second connecting frame 3 can be positioned right above the first connecting frame 2, and the blue algae interception amount is doubled on the basis of the original first connecting frame 2;
the lower connecting rod 5 at the bottom of the second connecting frame 3 is provided with the compensating plate 16, the compensating plate 16 is of a U-shaped structure, the bottom of the compensating plate 16 is flush with the bottom of the first connecting frame 2, the bottom of the compensating plate 16 is provided with the upper fence 4, and through the arranged compensating plate 16, the sliding rod 9 can be effectively prevented from directly penetrating through the second connecting frame 3, so that a through hole is reserved on the second connecting frame 3, and when the blue algae are intercepted, part of the blue algae can flow out from the through hole matched with the automatic folding mechanism, and the efficiency of blue algae interception can be influenced;
a clamping block 14 is arranged at the top of the second connecting frame 3, a clamping groove 15 matched with the clamping block 14 is arranged at the top of the first connecting frame 2, and the clamping block 14 and the clamping groove 15 are designed to ensure that the first connecting frame 2 and the second connecting frame 3 are connected more firmly, so that the blue-green algae is not easy to loosen when being intercepted;
when the blue algae collecting device works, the first connecting frame 2 is driven to move along the water surface to collect blue algae, the blue algae is accumulated along with the blue algae, when the blue algae reaches the position of the power plate 12, the blue algae acts on the power plate 12 under the matching of pulling the first connecting frame 2 to move, the power plate 12 is pushed to move, the positioning pin 10 is moved through the sliding rod 9, the second connecting frame 3 is separated from the second connecting frame 3, the second connecting frame 3 automatically overturns upwards under the action of the torsion spring, and the upper fence 4 on the second connecting frame 3 is also put into the working process of the blue algae, so that the efficiency of collecting the blue algae is greatly improved; therefore, the automatic folding mechanism can automatically complete overturning according to the quantity of intercepted blue-green algae, so that the quantity of the intercepted blue-green algae is enlarged.
The working principle of the invention is as follows: through the combined use of physical, chemical and biological repair technologies, the algae cells are removed, the water body is cleaned, simultaneously the sediment burden is not increased, and the algae cell removal rate reaches more than 90 percent; the phosphorus removal material further reduces the phosphorus content of the water body to inhibit the growth of algae cells and prevent secondary outbreak, and the total phosphorus removal rate is not lower than 80 percent; the ecological diversity is increased by the contact oxidation film process and the construction of the aquatic plants, the self-cleaning capacity of the water body is improved, and the water quality is further purified by the growth and absorption of the aquatic plants, the metabolism of microorganisms and the nitrification and denitrification;
the first connecting frame 2 and the second connecting frame 3 are connected with each other through an automatic folding mechanism; through the enclosure subassembly of rail 1 and last rail 4 constitution down, can improve the volume of intercepting the blue alga effectively, avoid because at the interception in-process, the blue alga is a lot of, surpasss the top surface of rail 1 down to make and to intercept other unnecessary blue alga, thereby only intercept the blue alga operation to the surface of water again, increased the problem of work load.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The method for restoring the water body polluted by the water bloom is characterized by comprising the following steps:
step 1: blue algae is enriched and intercepted through a soft enclosure, so that the blue algae enters an enrichment area, and a phosphorus removal material is hung and put in the enrichment area;
step 2: sucking floating algae cells in the enrichment region into a bypass algae cell flocculation region, adding a magnetic flocculant into a polluted water body in the flocculation region, stirring, precipitating magnetic mixture floccules formed by the algae cells in situ, sucking the precipitated floccules out through a bottom suction pipe, dewatering, performing subsequent treatment, and returning the treated water to a downstream restoration region of the original polluted water body;
and step 3: the downstream restoration area is provided with a lake purifier as a core and is assisted by emergent aquatic plants, and sewage flowing through the restoration area is further decomposed and absorbed by micromolecular organic matters under the combined action of microorganisms and aquatic plants, so that nitrogen and phosphorus removal and carbon removal are realized.
2. The method for remediating water body polluted by water bloom as claimed in claim 1, wherein in the step 1, the enclosure is a soft enclosure which extends into the water for 20-40cm, and the moving speed of the blue algae enriched in the soft enclosure is 5-10m/min.
3. The method for restoring water bloom polluted water body according to claim 1, wherein in the step 1, the phosphorus removal material is prepared from cement, fly ash, gypsum powder, slag powder and foaming agent according to the mass percentage of 13-15%:45-55%:13-15%:10-15%:0.05-0.1% of aerated concrete.
4. The method for remediating a water body polluted by a water bloom according to claim 1, wherein in the step 2, the flocculating agent is one or a combination of PAC, PAM and magnetic flocculating agent.
5. The method for remediating a water bloom polluted water body as claimed in claim 1, wherein in the step 2, the flocculant is a magnetic flocculant and is composed of a magnetic material, a coagulant and a coagulant aid, by mass, 25-35%:45-55%:10-15% of the total weight of the composition.
6. The method for remediating a water body polluted by a bloom as claimed in claim 1, wherein in the step 2, the adding amount of the flocculating agent is 0.5-3t/km 3 。
7. The method for remediating a water body polluted by a water bloom as claimed in claim 1, wherein the soft enclosure is characterized in that the lower enclosure (1) and the upper enclosure (4) are connected with each other through a connecting frame, the connecting frame is connected through an automatic folding mechanism, and the automatic folding mechanism controls the overturning of the upper enclosure (4).
8. The method for remediating a water body polluted by a bloom as claimed in claim 7, wherein the turning angle of the upper fence (4) is 0-180 °.
9. The method for restoring the water body polluted by the water bloom as claimed in claim 8, wherein the automatic folding mechanism comprises a sliding rod (9), one end of the sliding rod (9) is connected with a power plate (12), the other end of the sliding rod (9) is connected with a positioning pin (10), a spring (11) is sleeved on the sliding rod (9), and the positioning pin (10) is connected with the upper fence (4) in a buckling manner.
10. The method for restoring the water body polluted by the water bloom as claimed in claim 9, wherein the lower rail (1) and the upper rail (4) are connected through a torsion spring, and the power source of the power plate (12) is: along with the accumulation of the blue algae, when the blue algae reaches the position of the power plate (12), the blue algae will act on the power plate (12) under the cooperation of the pulling force.
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