JP3542830B2 - How to remove green algae from lakes - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method for removing green algae that has propagated in lake water.
[0002]
[Prior art]
Conventionally, to remove green algae that has propagated in lake water, a coagulant such as aluminum sulfate is put into the water of the lake, the green algae are agglomerated, and if necessary, aeration is performed to float the aggregates on the water surface. A method has been adopted in which the water is sucked and collected by a vacuum pipe and collected, or a method in which green algae is killed by adding copper sulfate to lake water.
[0003]
[Problems to be solved by the invention]
However, in the method of coagulating green algae and collecting it with a vacuum pipe, a vacuum device or the like must be installed on the shore of lakes and marshes. It is uneconomical. In addition, there are problems such as environmental pollution of the lake or its surroundings due to the coagulant, and since the water of the lake is also sucked by a considerable amount from the vacuum pipe, the efficiency of removing green algae is low and the water of the lake is reduced. There is also a problem.
[0004]
[Means for Solving the Problems]
As a means for the present invention is to solve the above conventional problems, both ends to form a narrow窄部having an opening (4B) in water (2) lakes (1),該湖swamp the pump (5) The water (2) of (1) is passed through the opening (4B) from one opening , and the green algae (3) contained in the water (2) is aggregated by the generated shearing force, so that the constriction ( 4B) It is intended to provide a method for removing green algae (3) of a lake (1) adhered to the inner wall (4A), and the inner wall (4A) of the constricted portion (4B) is preferably rough.
[0005]
[Action]
When allowed to pass through a narrow窄部(4B) having openings at both ends of water (2) lakes (1), occurring between the constriction and the inner wall of (4B) (4A) and water (2) The green algae (3) contained in the water (2) aggregates due to the shearing force, and adheres to the inner wall (4A) of the constriction (4B). When the amount of green algae (3) adhered to the inner wall (4A) of the constriction (4B) reaches saturation, the green algae (3) is removed from the inner wall (4A) and regenerated. When the inner wall (4A) has a rough surface, the shearing force effectively acts on the water (2), and the adhesion efficiency of the green algae (3) is improved. The rough surface is constituted by, for example, a net or a flocking layer.
[0006]
【Example】
The present invention will be described with reference to an embodiment shown in FIGS. 1 and 2. (1) is a lake, and green algae (3) are breeding in water (2) of the lake (1). In the water (2) of the lake (1), a streamer (4) composed of a net is introduced, and a floating plate (6) on which a pump (5) is installed is floated. An opening at one end of the streamer (4) is connected to an injection pipe (7) inserted from the outlet side of the pump (5).
A water-absorbing pipe (8) is inserted from the inlet side of the pump (5) and inserted into the water (2) of the lake (1), and fish, garbage and the like are attached to the tip of the water-absorbing pipe (8). A mesh basket (9) is attached to prevent suction from (8), and a cloth bag (10) filled with a coagulant such as aluminum sulfate is placed in the mesh basket (9).
[0007]
In the above configuration, when the pump (5) is operated, the green algae (3) is sucked together with the water (2) from the water absorbing pipe (8), and is injected into the blown stream (4) through the injection pipe (7). At this time, the flocculant filled in the cloth bag (10) in the net basket (9) elutes into the surrounding water (2) and is sucked from the water absorbing pipe (8). Then, as shown in FIG. 2, the water (2) is generated between the stream (4) and the inner wall (4A) of the stream (4) when passing through the constriction (4B) formed in the stream (4). The green algae (3) contained in the water (2) coagulate and adhere to the inner wall (4A) of the streamer (4) due to the shearing force generated and by the auxiliary action of the flocculant. Green algae (3) are collected in the streamer (4). The coagulant is not essential because the green algae (3) in the water (2) coagulate only by shearing force.
When the adhesion of the green algae (3) to the inner wall (4A) of the streamer (4) reaches saturation, the streamer (4) is taken out from the water (2) of the lake (1) and the green algae (3) from inside the streamer (4) Remove and regenerate by washing if desired.
[0008]
3 to 5 show another embodiment of the present invention. In this embodiment, as shown in FIG. 4, ropes (15) are attached to the four corners of a plastic sheet (14) on which a flocking layer (14A) as an inner wall is formed on the lower surface, and a metal weight (weight and spacer) is further mounted on the lower surface. Attach a plurality of 16) and put the plastic sheet (14) into the water (2) of the lake (1). The sheet (14) is settled to the bottom (1A) of the lake (1) by the metal weight (16), and a constriction (14B) is formed between the sheet (14) and the bottom (1A) of the lake (1). It is formed.
By operating the pump (5), the water (2) of the lake (1) is sucked from the water absorption pipe (8) through the net cage (9), and the water is sucked into the constriction (14B) through the injection pipe (7). Pass through (2). At this time, the green algae (3) contained in the water (2) is generated by the shearing force generated between the flocked layer (14A) on the lower surface of the sheet (14) and the water (2) in the constricted portion (14B). ) Aggregates and adheres to the lower surface of the sheet (14) as shown in FIG. 5, whereby the green algae (3) are collected on the lower surface of the sheet (14). When the amount of green algae (3) attached to the lower surface of the sheet (14) reaches saturation, the sheet (14) is pulled up from the water (2) of the lake (1) via a rope (15), and the sheet (14) is pulled up. ) Remove green algae (3) adhering to the lower surface.
[0009]
In addition to the above-described embodiment, the streamer (4) may be constituted by a plastic sheet having a flocked layer formed inside, or a net may be used in place of the plastic sheet (14).
[0010]
【The invention's effect】
Therefore, according to the present invention, it is not necessary to install devices and the like on the shores of lakes and marshes. Green algae can be efficiently removed by inexpensive devices in lakes and lakes in any terrain, and there is no concern about environmental pollution and the like. It does not decrease because it is circulated.
[Brief description of the drawings]
1 and 2 show an embodiment of the present invention.
FIG. 1 is an explanatory view of a green algae collecting state. FIG. 2 is a partial cross-sectional view of a streamer. FIGS. 3 to 5 show another embodiment of the present invention.
FIG. 3 is an explanatory diagram of a green algae collection state. FIG. 4 is a perspective view of a plastic sheet. FIG. 5 is a partial cross-sectional view of a plastic sheet.
1 lake
2 water
3 Green algae
4 Streamers
4A inner wall
4B Stenosis
5 pump
7 Injection pipe
14 Plastic sheet
14A Flocked layer (inner wall)
14B Stenosis

Claims (2)

The narrow窄部formed having openings at both ends in the water in lakes, passed through from one opening該湖marsh water by the pump into the stenosis, thereby aggregating the green algae contained in the water by the shearing forces generated A method for removing green algae in lakes and mars, wherein the method is applied to the inner wall of the constriction 2. The method according to claim 1, wherein the inner wall of the constriction has a rough surface.

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