CN111764365A - Method for actively gathering cyanobacterial bloom and floating garbage - Google Patents
Method for actively gathering cyanobacterial bloom and floating garbage Download PDFInfo
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- CN111764365A CN111764365A CN202010661253.9A CN202010661253A CN111764365A CN 111764365 A CN111764365 A CN 111764365A CN 202010661253 A CN202010661253 A CN 202010661253A CN 111764365 A CN111764365 A CN 111764365A
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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
- E02B15/10—Devices for removing the material from the surface
Abstract
The invention belongs to the technical field of water body treatment, and particularly discloses a method for actively gathering cyanobacteria bloom and floating garbage, wherein an enclosure is arranged in a water area without bloom or with less bloom, and cyanobacteria and garbage are gathered by a static collection method and a dynamic collection method, wherein the static collection method comprises the following steps: fixing the enclosure in a water area, and floating and gathering blue algae and garbage in the enclosure under the action of wind waves; the dynamic collection method comprises the following steps: the enclosure is fixed on a ship, and the ship pushes the enclosure to move so as to collect blue algae and garbage. The method can actively gather the cyanobacteria bloom and the floating garbage in lakes and reservoirs, is beneficial to reducing the harm of the cyanobacteria and other solid pollutants dispersed in the water body, provides favorable conditions for salvage or other treatment, avoids the large-area outbreak of the cyanobacteria bloom and the floating garbage covering the water body, and achieves the purposes of purifying the water quality and reducing the social and economic losses.
Description
Technical Field
The invention relates to the technical field of water body treatment, in particular to a method for actively gathering cyanobacterial bloom and floating garbage.
Background
The microcystis, anabaena and the like in the cyanophyta are common water bloom algae. The microcystis is the most common water bloom algae in eutrophic water bodies such as Taihu lake, Dian lake and nested lake. The problems of cyanobacterial bloom and floating garbage are important problems in lake management and water resource utilization processes in China. The death and decomposition of a large amount of blue-green algae can cause the dissolved oxygen in water to be rapidly reduced, and some water-blooming blue-green algae can secrete algal toxins, so that fishes and shrimps in water die a large amount, the water ecological environment is influenced, the drinking water safety and landscape of local residents are directly endangered, and huge economic loss and negative social influence are caused. The floating garbage can cause visual pollution to threaten navigation safety, and can cause water pollution to deteriorate water quality and seriously harm public drinking water safety.
In order to solve the problems, people currently adopt a physical, chemical or biological method to salvage or remove the blue algae generated in the water body as much as possible. However, due to the large area of large water area, large wind wave and other reasons, the blue algae is often widely distributed and easily floats with the wind or is mixed with the bottom water, the method can only play a certain role no matter the method is used singly or used comprehensively, and the method is mostly started when the bloom is outbreak or even serious, so that the method is difficult to fundamentally deal with and meet the requirements of timely controlling and efficiently removing the blue algae bloom in the large water area.
Therefore, there is a need to find a method for actively collecting cyanobacterial blooms and floating garbage in lakes and reservoirs when the outbreak of cyanobacterial blooms is not serious, so as to reduce the harm of the dispersion of solid pollutants in water and provide favorable conditions for salvage or other treatment.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a method for actively gathering cyanobacterial bloom and floating garbage, which can actively gather cyanobacterial bloom and floating garbage when the bloom is not severe, so as to reduce the harm of dispersion of solid pollutants in water and provide favorable conditions for salvage or other treatment.
In order to achieve the above objects and other related objects, the present invention provides a method for actively gathering cyanobacteria bloom and floating garbage, wherein an enclosure is arranged in a water area where no bloom occurs or a moderate and slight bloom occurs, and cyanobacteria and garbage are gathered by a static collection method and/or a dynamic collection method, wherein the static collection method comprises: fixing the enclosure in a water area, and floating and gathering blue algae and garbage in the enclosure under the action of wind waves; the dynamic collection method comprises the following steps: the enclosure is fixed on a ship, and the ship pushes the enclosure to move so as to collect blue algae and garbage.
Further, when the density of algae in the water body is less than or equal to 108cells L-1When the water bloom is serious, the water bloom is moderate and slight, or the algae particle aggregation or a few blue algae floating zones are observed, but the water bloom is not aggregated to be serious in high concentration.
Further, the enclosure is a U-shaped enclosure or an O-shaped enclosure.
Further, when the wind speed is less than 3m s-1When in use, a U-shaped enclosure is used; when the wind speed is greater than or equal to 3m s-1When used, an O-shaped enclosure is used. When the wind waves in the water area are small, the blue algae often float on the water surface, and the blue algae and garbage on the water surface can be effectively gathered by using the U-shaped enclosure with the opening; however, when the wind wave in the water area is large, the blue algae and the garbage can be dispersed and mixed with the bottom water, the O-shaped enclosure is used, the blue algae and the garbage can be dispersed in a water column surrounded by the O-shaped enclosure through the O-shaped enclosure, and when the wind wave becomes small, the blue algae and the garbage float upwards and are gathered in the O-shaped enclosure.
Further, the method comprises the following four ways:
(1) when the wind speed is less than 3m s-1When in use, the U-shaped enclosure is placed in a water area and fixed well, so that the U-shaped enclosure is U-shapedThe opening of the enclosure faces the direction of water flow or prevailing wind, blue algae and garbage can float and gather at the bottom of the U-shaped enclosure, and then static collection can be completed;
(2) when the wind speed is less than 3m s-1When in use, the open end of the U-shaped enclosure is fixed with the ship, and the ship runs in a countercurrent or upwind way, thus finishing dynamic collection facing water flow;
(3) when the wind speed is greater than or equal to 3m s-1When the wind waves are reduced, the blue algae float upwards, and the O-shaped enclosure is contracted, so that static collection can be finished;
(4) when the wind speed is greater than or equal to 3m s-1When the wind wave becomes small, the blue algae floats upwards, the O-shaped enclosure is contracted, and dynamic collection can be completed.
Further, enclose and separate including isolation body, heavy object and submarine mounting, the isolation body can float in the surface of water, the isolation body is U type or O type, the heavy object is located the isolation body bottom for the balance that encloses the partition is adjusted, submarine mounting links to each other with the isolation body through connecting the rope, is used for the fixed partition that encloses, accomplishes static collection.
Further, the insulator is an inflatable and deflatable rubber float. The rubber floating body is hollow inside and can float on the water surface, the size of the isolating body can be adjusted through inflation and deflation, and contraction is achieved, so that blue algae or floaters in the enclosure can be gathered conveniently.
Further, the height of the separator is 0.8 to 1.5 m; preferably, the height of the separator is 1 m.
Further, the draught of the isolated body when floating on the water surface is 0.5-0.8 m. When the enclosure floats on the water surface, the draft part is used for intercepting algae in the water body, and the height higher than the water surface is used for preventing water flow from sloshing to enable the algae to cross the enclosure.
Furthermore, a cover is arranged above the isolating body of the U-shaped enclosure, the cover is preferably a closed transparent cover, algae and garbage collected in the enclosure can be prevented from being blown out of the enclosure by wind, and the O-shaped enclosure does not need to be additionally provided with the cover.
As mentioned above, the method for actively gathering cyanobacterial bloom and floating garbage has the following beneficial effects:
the method can actively gather the cyanobacteria bloom and floating garbage in lakes and reservoirs, is beneficial to reducing the harm of the dispersion of solid pollutants in water bodies, and provides favorable conditions for salvage or other treatment.
The enclosure is arranged in a water area where the water bloom does not burst or the water bloom does not burst seriously, so that the blue algae and the floating garbage on the water surfaces of the lakes and rivers can be gathered. When the wind waves in the water area are small, the blue algae often float on the water surface, the opening of the U-shaped enclosure is fixed against the water flow direction or the prevailing wind, the blue algae and garbage can float and gather at the bottom of the U-shaped enclosure, and then the static collection can be completed. If the two ends of the U-shaped top are fixed with the ship, the ship runs in a countercurrent or upwind way, and dynamic collection can be completed against water flow. When the wind wave in the water area is large, the blue algae is often dispersed in the water column, the O-shaped enclosure is fixed in the lake, and when the wind wave becomes small, the blue algae floats upwards and shrinks the O-shaped enclosure, so that the static collection of the blue algae and the garbage can be completed. If the O-shaped enclosure is fixed with the ship through a rope, the position of the O-shaped enclosure is actively moved to repeat the static collection method of the O-shaped enclosure, and then the dynamic collection of the O-shaped enclosure can be completed.
The enclosure is arranged in the water area where the water bloom does not burst or does not burst seriously, so that the blue algae and floating garbage on the water surface of the lake or river can be gathered in advance, the dispersion of the blue algae water bloom is avoided, and the fishing is convenient; meanwhile, when obvious cyanobacterial bloom is gathered in the enclosure, the water area needs to be treated, and related personnel can treat the cyanobacterial bloom in advance to avoid large-area outbreak of the cyanobacterial bloom, greatly reduce the cyanobacterial bloom treatment difficulty and treatment cost, reduce the water pollution degree and reduce the social and economic losses.
Drawings
FIG. 1 is a schematic view showing an uncovered U-shaped enclosure just after being placed in a water area in example 1 of the present invention;
FIG. 2 is a schematic view showing a state where an uncovered U-shaped enclosure is placed in a water area to collect blue algae in example 1 of the present invention;
FIG. 3 is a schematic view showing the structure of a U-shaped enclosure covered in a water area according to embodiment 1 of the present invention;
FIG. 4 is a schematic view showing a state where the covered U-shaped enclosure of example 1 of the present invention is placed in a water area to collect blue algae;
FIG. 5 is a graph showing the force analysis of the algae in the bottom of the U-shaped enclosure in example 1 of the present invention;
FIG. 6 is a first schematic diagram showing the analysis of the probability that a wind can blow floating garbage or blue algae out of a U-shaped enclosure according to example 1 of the present invention;
FIG. 7 is a schematic diagram showing the analysis of the probability that the wind blows floating garbage or blue algae out of the U-shaped enclosure in example 1 of the present invention;
FIG. 8 is a schematic view showing the structure of an O-shaped enclosure installed in a water area according to example 2 of the present invention;
FIG. 9 is a schematic view showing a state where an O-shaped enclosure is placed in a water area to collect blue algae in example 2 of the present invention;
FIG. 10 is a graph showing the force analysis of the algae in the O-shaped containment edge in example 2 of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Description of reference numerals:
the water surface 1, the U-shaped isolation body 2, the heavy object 3, the connecting rope 4, the underwater fixing piece 5, the riverbed 6, the cover 7 and the O-shaped isolation body 8.
The invention provides a method for actively gathering cyanobacteria bloom and floating garbage, which is characterized in that a fence is arranged in a water area where no bloom or moderate and slight bloom occurs, and cyanobacteria and garbage are gathered by a static collection method and a dynamic collection method. When the density of algae in the water body is less than or equal to 108cells L-1When a significant bloom is observed, or when an aggregation of algae particles or a few floating zones of blue algae is observed but not aggregated in high concentration into a severe bloom, the bloom belongs to a medium and slight bloom. The method hasThe body comprises the following four modes:
(1) when the wind speed is less than 3m s-1When the U-shaped enclosure is placed in a water area and fixed, the opening of the U-shaped enclosure faces the direction of water flow or prevailing wind, blue algae and garbage can float and gather at the bottom of the U-shaped enclosure, and then static collection can be completed;
(2) when the wind speed is less than 3m s-1When in use, the open end of the U-shaped enclosure is fixed with the ship, and the ship runs in a countercurrent or upwind way, thus finishing dynamic collection facing water flow;
(3) when the wind speed is greater than or equal to 3m s-1When the wind waves are reduced, the blue algae float upwards, and then the static collection can be completed;
(4) when the wind speed is greater than or equal to 3m s-1When the wind waves are reduced, the blue algae float upwards, and dynamic collection can be completed.
Blue algae can float on the water surface through a pseudo-vacuole structure to obtain more illumination, and garbage with small density, such as plastic products, also floats on the water surface. When the wind waves in the water area are small, the size of the colony can be increased through proper wind wave disturbance, at the moment, the blue algae exist in the colony form, and the blue algae have larger size and buoyancy and are easier to float on the water surface. The opening of the U-shaped enclosure is fixed against the water flow direction or the wind direction, and blue algae and garbage can float and gather at the bottom of the U-shaped enclosure, so that static collection can be completed. If the two ends of the U-shaped top are fixed with the tug boat, the tug boat runs in a countercurrent or upwind way, and dynamic collection can be completed against water flow. When the wind waves in the water area are large, the group shape can be changed or the group can be disintegrated due to too strong disturbance, the blue algae are often dispersed in a water column, the O-shaped enclosure is fixed in a lake, and the blue algae float upwards when the wind waves are reduced, so that the static collection of the blue algae and garbage can be completed. If the O-shaped enclosure is fixed with the tugboat through the rope, the position of the O-shaped enclosure is actively moved to repeat the static collection method of the O-shaped enclosure, and then the dynamic collection of the O-shaped enclosure can be completed.
The specific implementation process is as follows:
example 1
As shown in fig. 1 and 2, the U-shaped enclosure comprises a U-shaped isolation body 2, a weight 3 and a water bottom fixing piece 5, wherein the U-shaped isolation body 2 can float on the water surface 1, specifically, the U-shaped isolation body 2 is a rubber floating body which can be inflated and deflated, the rubber floating body is hollow inside and can float on the water surface, the size of the isolation body can be adjusted through inflation and deflation, and the contraction is realized, so that the blue algae or the floating objects in the enclosure can be gathered. The weight 3 is positioned at the bottom of the U-shaped isolated body 2 and used for adjusting the balance of the U-shaped enclosure, and the weight 3 floats in water; submarine mounting 5 links to each other with U type isolator 2 through connecting rope 4 (like metal chain such as rope or iron chain) for fixed U type encloses to separate, accomplishes static collection. The height of the U-shaped isolation body 2 is 1m, when the U-shaped enclosure floats on the water surface 1, the draft is 0.6m, the draft part is used for intercepting algae in the water body, and the height 0.4m higher than the water surface 1 is used for preventing water flow from sloshing and leading the algae to cross the U-shaped enclosure. Specifically, a gabion can be used as the weight 3, high-quality low-carbon steel wires are woven into a net cage made of a multi-stranded hexagonal net, and stones are filled into the net cage to make the gabion; or directly adopting lead blocks as the weight 3; then one end of a connecting rope 4 (such as a metal chain like a rope or an iron chain) is connected with the gabion or the lead block, and the other end is connected with the U-shaped isolation body 2. The underwater fixing part 5 is a fixing pile nailed into the riverbed 6, the fixing pile can adopt a timber pile or iron nails, an iron ring is arranged on the fixing pile, and a rope or a metal chain on a gabion or a lead block is connected with the fixing pile through the iron ring so as to prevent the U-shaped enclosure from moving.
In this embodiment, the principle of gathering blue algae and floating garbage by the U-shaped enclosure is as follows:
the horizontal movement of algae is closely related to the water flow movement caused by wind. About 3m s-1The wind speed of the water layer can make the water layer on the surface of the small lake horizontally drift, and algae are driven to accumulate to the downwind area of the lake. In larger shallow lakes, where wind causes horizontal circulation of the lake water, the highest concentration of algae may occur in the center of the horizontal circulation. Different wind fields have great influence on the horizontal distribution of algae in lakes, and critical wind speeds are present, which range from 2 to 3m s-1. The experiment simulation finds that the relation between the horizontal drift rate of the blue algae in lakes and reservoirs and the wind speed and the flow velocity is as follows: vAlgae (Saccharum sinensis Roxb.)＝0.036VWind power+0.481VWater (W)+0.034(R20.972). When the wind speed is less than the critical wind speed, the water surface canThe algae on the water surface rapidly drift to the windward bank along the wind direction and are collected by the U-shaped enclosure.
As shown in fig. 1 and 2, floating garbage or blue algae enters the U-shaped enclosure under the action of water flow or prevailing wind, and two situations can occur after entering the U-shaped enclosure: in the first case, the floating garbage or the blue algae still moves to the U-shaped enclosure boundary under the action of water flow or wind power, and the floating garbage or the blue algae move to the U-shaped enclosure boundary until reaching the boundary according to the Newton's second law and the Newton's third law. At this time, as shown in the force analysis chart of FIG. 5, the floating garbage or blue algae receives the force of water flow or wind and the supporting force of the U-shaped enclosure, and the force generated by the water flow or wind is FWater (W)Is represented by the formula FWater (W)Component F ofyActing force F on algae with U-shaped enclosureNEqual in size and opposite in direction. And FWater (W)Component F ofXIf the static friction force between the algae and the U-shaped enclosure is less than the static friction force between the algae and the U-shaped enclosure, the algae and the U-shaped enclosure are kept relatively static. FXIf the static friction force is larger than the static friction force, the algae can move at the bottom of the U-shaped enclosure until the U-shaped enclosure is at a certain point FXLess than the static friction between the algae and the U-shaped enclosure, the algae will be relatively static.
In the second case, the floating garbage or blue algae is blown out of the U-shaped enclosure by strong wind power. When the height of the U-shaped enclosure is infinitely small, the untimely state can be ignored, and as shown in fig. 6, the central plane DEGFU-shaped enclosure of the U-shaped enclosure is bisected from the central point of the circular arc at the bottom of the U-shaped enclosure. As shown in FIG. 7, the rectangular DEGF has a width of h, a length of a total length a, and an angle a of the U-shaped enclosure
The angle range of wind which can blow the floating garbage or the blue algae out of the U-shaped enclosure is shown, and P is the probability that the wind can blow the floating garbage or the blue algae out of the U-shaped enclosure.
P＝arctan(a/h)/2π
As a further improvement of the invention, a closed transparent cover 7 is added to the U-shaped enclosure, so that the blue algae and the floating garbage can be collected before and after the blue algae and the floating garbage are collected, as shown in figures 3 and 4, and the blue algae and the floating garbage in the U-shaped enclosure can be prevented from being blown out of the enclosure by wind after the cover 7 is added to the U-shaped enclosure.
Example 2
As shown in fig. 8 and 9, the O-shaped enclosure comprises an O-shaped isolation body 8, a weight 3 and a water bottom fixing piece 5, wherein the O-shaped isolation body 8 can float on the water surface 1, specifically, the O-shaped isolation body 8 is a rubber floating body which can be inflated and deflated, the rubber floating body is hollow inside and can float on the water surface, the size of the isolation body can be adjusted through inflation and deflation, and contraction is realized, so that blue algae or floating objects in the enclosure can be gathered. The weight 3 is positioned at the bottom of the O-shaped isolated body 8 and used for adjusting the balance of the O-shaped enclosure, and the weight 3 floats in water; the underwater fixing part 5 is connected with an O-shaped isolation body 8 through a connecting rope 4 (such as a rope or a metal chain like an iron chain) and used for fixing an O-shaped enclosure to finish static collection. The height of the O-shaped isolation body 8 is 1.5m, when the O-shaped enclosure floats on the water surface 1, the draught is 0.8m, the draught part is used for intercepting algae in the water body, and the height which is 0.7m higher than the water surface 1 is used for preventing water flow from sloshing to enable the algae to cross the O-shaped enclosure.
In this embodiment, the O-type enclosure gathering blue algae and floating garbage principle is as follows:
in still water, the active motion state of particles in a water body is closely related to the kinetic parameters (density, shape and particle size) of the particles. Depending on the reynolds number of the particulate matter, the particulate matter settling can be divided into laminar, transitional, and turbulent states. At present, the suspension or sedimentation of blue algae particles in a laminar flow state is mainly considered in the research on the movement of blue algae particles (single cells or groups). Under the condition, the floating rate of the blue algae particles depends on kinetic parameters. Under the premise of known density, the floating velocity (ω cy) of the blue algae population can be calculated by using Stokes formula.
In the above formula, g is gravity acceleration, dcyThe particle size of blue algae population is processed by microscope and imageDirect tool measurement of pcyThe population density of blue algae is determined by a water analysis method, rhowIs the density of the water body, v is the kinematic viscosity of the water,
the shape coefficient of the blue algae population (1 in the case of spheres).
The modified DGC method is used for determining the dynamic parameters of the visible blue-green algae population, which have important influence on the movement of the blue-green algae population. The particle size of the blue algae group has important influence on the active movement of the blue algae group. In natural water, the density of the blue algae population is usually between 990 and 995kg m-3The particle size range is between 300-1400 μm. The field measurement shows that the floating rate of the blue algae colony increases along with the increase of the colony particle size, the floating rate of the blue algae colony between 100 and 425 mu m is 1475 times of a small colony or a single cell with the particle size of less than 20 mu m, and therefore the floating rate of the blue algae colony is determined by the particle size. When the wind wave in the water area becomes smaller, the blue algae group floats to the water surface under the control of huge effective buoyancy and is gathered by the O-shaped enclosure. Once the blue-green algae enters the O-shaped enclosure and touches the boundary of the O-shaped enclosure, the stress is shown in figure 10, and the blue-green algae cannot escape from the enclosure and only can move in the enclosure due to the resultant force of the supporting force of the enclosure, the wind power and the water flow.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A method for actively gathering cyanobacterial bloom and floating garbage is characterized in that a barricade is arranged in a water area where no cyanobacterial bloom or moderate and slight cyanobacterial bloom occurs, and cyanobacterial and garbage are gathered by a static collection method and/or a dynamic collection method, wherein the static collection method comprises the following steps: fixing the enclosure in a water area, and floating and gathering blue algae and garbage in the enclosure under the action of wind waves; the dynamic collection method comprises the following steps: the enclosure is fixed on a ship, and the ship pushes the enclosure to move so as to collect blue algae and garbage.
2. The method of claim 1, wherein: when the density of algae in the water body is less than or equal to 108cells L-1When the water bloom is serious, the water bloom is moderate and slight, or the algae particle aggregation or a few blue algae floating zones are observed, but the water bloom is not aggregated to be serious in high concentration.
3. The method of claim 1, wherein: the enclosure is a U-shaped enclosure or an O-shaped enclosure.
4. The method of claim 3, wherein: when the wind speed is less than 3m s-1When in use, a U-shaped enclosure is used; when the wind speed is greater than or equal to 3m s-1When used, an O-shaped enclosure is used.
5. The method of claim 3, wherein: the method comprises the following four modes:
(1) when the wind speed is less than 3m s-1When the U-shaped enclosure is placed in a water area and fixed, the opening of the U-shaped enclosure faces the direction of water flow or prevailing wind, blue algae and garbage can float and gather at the bottom of the U-shaped enclosure, and then static collection can be completed;
(2) when the wind speed is less than 3m s-1When in use, the open end of the U-shaped enclosure is fixed with the ship, and the ship runs in a countercurrent or upwind way, thus finishing dynamic collection facing water flow;
(3) when the wind speed is greater than or equal to 3m s-1When the wind waves are reduced, the blue algae float upwards, and then the static collection can be completed;
(4) when the wind speed is greater than or equal to 3m s-1When the wind wave becomes small, the blue algae floats upwards, the O-shaped enclosure is contracted, and dynamic collection can be completed.
6. The method of claim 3, wherein: enclose and separate including isolation body, heavy object and submarine mounting, the isolation body can float in the surface of water, the isolation body is U type or O type, the heavy object is located the isolation body bottom for adjust and enclose the balance that separates, submarine mounting links to each other with the isolation body through connecting the rope, is used for the fixed enclosure that encloses to separate, accomplishes static collection.
7. The method of claim 5, wherein: the insulator is an inflatable and deflatable rubber float.
8. The method of claim 5, wherein: the height of the separator is 0.8-1.5 m.
9. The method according to claim 5 or 6, characterized in that: the draught of the isolated body floating on the water surface is 0.5-0.8 m.
10. The method of claim 5, wherein: a cover is arranged above the isolating body of the U-shaped enclosure.
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| CN113605336A (en) * | 2021-07-30 | 2021-11-05 | 江苏中科基业环境科技有限公司 | Backflow-preventing blue algae enclosure collecting device and using method thereof |
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