JP7235304B2 - Blue-green algae collection device - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act (1) Publication by conducting the test Test date: September 12, 2018 to June 14, 2020 Test location: Otsuka Pond (1832, Otsuka-cho, Mito-shi, Ibaraki, in Otsuka Park) )

TECHNICAL FIELD The present invention relates to a water-bloom recovery apparatus, and more particularly to a water-bloom recovery apparatus for recovering water-bloom from a water-bloom concentration apparatus for concentrating water-bloom in closed water areas such as lakes, ponds, rivers, and closed sea areas.

In enclosed water areas such as lakes, ponds, and rivers, the concentration of nutrients such as phosphorus and nitrogen in the water increases, and phytoplankton called blue-green algae sometimes occurs in large quantities.

If nutrients can be quickly removed from eutrophic water, it is possible to purify the water with aquatic plants and moderate amounts of phytoplankton. However, it is difficult to quickly remove nutrients dissolved in water, and algal blooms are likely to occur in large numbers.

If a large number of blue-green algal blooms are left unattended, the oxygen concentration in the water area will drop and fish will die, and waterside and tap water that comes from the water area will have a foul odor. For this reason, it is necessary to improve the cause of eutrophication in closed water areas and at the same time remove the generated blue-green algae from closed water areas by efficiently recovering them.

Conventionally, blue-green algae was collected together with water using a drop, or water-bloom aggregates sedimented with a flocculant were collected together with a large amount of water using a pump. Since the collected blue-green algae is discarded or incinerated after reducing its volume, drying and incineration of the collected blue-green algae requires a great deal of energy and cost.

For this reason, the preferable conditions for a water-bloom collecting apparatus for efficiently collecting water-bloom from closed water areas are that the water-bloom can be efficiently collected, and that the water-bloom is dehydrated and collected in a low-moisture state, and the volume of the collected water-bloom is It is necessary to make it as small as possible.

As such a water-bloom collecting apparatus, for example, there is Patent Document 1.

The blue-green algae recovery apparatus of Patent Document 1 transfers turbid water containing blue-green algae, which is taken from a location such as a lake or a pond where blue-green algae are present, to a filtering unit. By filtering the transferred turbid water with a filtration filter provided in the filtration unit, the water-bloom-contaminated water containing a high concentration of blue-green algae is separated from the filtered water. Then, the water-bloom adhering to the filtration filter is scraped off with a brush. This makes it possible to collect the algae in a low moisture state and reduce the volume.

JP 2007-098342 A

Certainly, the water-bloom collecting apparatus of Patent Document 1 can efficiently collect water-bloom by using a filtration filter. In addition, since the water-bloom can be dehydrated by using a filtration filter, the volume of the collected water-bloom can be reduced.

However, in the water-bloom recovery apparatus of Patent Document 1, not only is the filter easily clogged during use, but the clogging reduces the dehydration performance of the water-bloom and increases the water content of the water-bloom recovered. A problem arises that the volume of the water-bloom increases. For this reason, there is a big problem that the filter needs to be washed frequently, and maintenance is difficult.

Against this background, there is a demand for a water-bloom collecting apparatus that can collect water-bloom in a low-moisture state even after long-term use and requires little maintenance.

The present invention has been made in view of such circumstances, and since the dehydration performance for dehydrating the blue-green algae does not deteriorate even if it is used for a long period of time, the volume of the collected blue-green algae can always be made small, and the water-bloom recovery requiring almost no maintenance. The purpose is to provide an apparatus.

In order to achieve the object, the water-bloom collecting apparatus of the present invention is a water-bloom collecting apparatus for collecting water-bloom floating in the vicinity of the water surface. It is characterized by comprising a plate means, a rake for scraping off the algae adhered to the rotating disk, and a water-bloom discharge means for receiving and discharging the algae scraped off by the rake.

Here, the rotating disc may be provided with a charging means for positively or negatively electrifying the rotating disc to generate an attracting force for electrostatically attracting the algae to the rotating disc.
Further, the rotating disk may be made of an insulator.

Here, discharging refers to discharging from the place before collecting the algae (for example, closed water areas such as lakes, ponds, rivers, closed sea areas, water-bloom concentrators, etc.) to the place where the water-bloom is collected.

According to the present invention, when the outer peripheral portion is immersed in the vicinity of the water surface and rotates vertically, the algal blooms adhere to the rotating disc, which can be scraped off with a rake.
Here, the rotary disc may be positively or negatively charged by charging means. The rotating disk can be made of a highly insulating material, and can be made difficult to discharge. As a result, the rotating disk generates a water-bloom adsorption force due to static electricity.

For example, when a negatively or positively charged rotating disk and a water-bloom approach each other, electrostatic induction occurs and they attract each other, so the water-bloom is attracted to the rotating disk. In addition, since the rotating disc that adsorbs the algae rotates vertically, the water in the algae runs down the surface of the rotating disc due to gravity until the algae is scraped off the rotating disc by the rake. . As a result, the water-bloom is dehydrated, so that the water-bloom can be collected in a low-moisture state.

In addition, since the apparatus for recovering algae of the present invention is a method of dewatering the water of the algae adsorbed on the rotating disk by gravity as described above, the dehydration performance does not deteriorate even if it is used for a long time, and the algal bloom can be reduced. It can be recovered in a water state, the volume of the recovered blue-green algae can always be kept small, and almost no maintenance is required.

In the present invention, the water-bloom recovery apparatus preferably includes a water-bloom concentration apparatus for concentrating the water-bloom from the water-bloom raw water containing the water-bloom.

The apparatus for collecting algae of the present invention can be directly installed in enclosed water areas such as lakes, ponds, rivers, and enclosed sea areas. is more efficient.

In the present invention, the rotary disc is preferably made of a highly insulating plastic material.

This is because a rotating disc made of plastic with high insulating properties retains charged electricity more easily than a rotating disc made of plastic with low insulating properties.

In the present invention, the rotating disk is preferably made of polyvinyl chloride, polycarbonate, acrylic resin, or rigid nylon.

These plastics are highly insulating and hard, and are readily available as general-purpose products at low prices.

In the present invention, it is preferable that the rotating disc is made of a material having a large surface roughness or is roughened.

This is because if the surface roughness of the rotating disk is large, the water-bloom is likely to be adsorbed.

In the present invention, the rotation speed of the rotating disc is preferably 3-6 rpm.

If the rotational speed of the rotating disk exceeds 6 rpm, a large amount of water is collected together with the water-bloom, making it impossible to reduce the water content of the collected water-bloom. On the other hand, if the rotational speed of the rotating disk is as low as less than 3 rpm, the water content of the collected water-bloom will be small, but the efficiency of collecting the water-bloom will be poor.

In the present invention, it is preferable that the charging means is a rake, and the rotary disc is charged with positive or negative electricity by friction between the rotary disc and the rake.

In this way, if static electricity is generated on the rotating disk by friction between the rotating disk and the rake, there is no need to separately prepare a dedicated charging device, and the device can be made compact and low cost.

In the present invention, it is preferable that a plurality of rotating discs are arranged in parallel as the rotating disc means. By arranging a plurality of rotating discs in parallel, the collection efficiency of blue-green algae can be improved.

In the present invention, it is preferable that the water-bloom discharging means is a gutter-shaped water-bloom discharging member inclined downward toward the discharging direction. Such a blue-green algae discharge member has a simple structure and can be manufactured at low cost.

In the present invention, it is preferable that the water-bloom discharging means has an air blow means for pushing out the water-bloom of the water-bloom discharging member in the discharging direction with air pressure. As a result, the water-bloom is not deposited on the water-bloom discharge member, so the water-bloom can be discharged smoothly.

In the present invention, it is preferable that the water-bloom discharging means is provided with an inclination angle adjusting means for adjusting the inclination angle of the water-bloom discharging member. As a result, the water-bloom is not deposited on the water-bloom discharge member, so the water-bloom can be discharged smoothly.

In the present invention, the water-bloom concentrating apparatus includes a water-bloom concentration tank, a water-bloom raw water intake means for taking the raw water-bloom water into the water-bloom concentration tank, and microbubbles for generating microbubble water containing microbubbles having a bubble diameter on the micro order level. A microbubble film formation that forms a microbubble film, which is a dense layer of microbubbles, in the vicinity of the liquid surface of the water-bloom concentration tank by continuously feeding the generated microbubble water into the liquid of the water-bloom concentration tank. a water-bloom raw water overflow means having an overflow pipe for overflowing the raw water-bloom water above the formed microbubble membrane; and a filtered flow forming means for forming a filtered flow for filtering the overflowed raw water of blue-green algae by the microbubble membrane by forming a flow directed from the upper side to the lower side of the microbubble membrane by discharging to the outside. is preferred.

Here, the blue-green algae raw water means water containing algae in the above-described enclosed water area from which the algae should be removed.

According to the water-bloom concentration and recovery apparatus having the above configuration, a microbubble film is formed in the vicinity of the liquid surface of the water-bloom concentration tank, and the raw water-bloom water containing the water-bloom overflows above the microbubble film. An equivalent amount of liquid is discharged from the bottom side of the microbubble membrane to form a filtered flow from the top side to the bottom side of the microbubble membrane in the algal bloom concentration tank.

As a result, since the water-bloom is concentrated on the upper side of the microbubble membrane, the water-bloom can be efficiently concentrated from the raw water for the water-bloom.

According to the water-bloom collecting apparatus of the present invention, the dehydration performance for dehydrating the water-bloom is not deteriorated even if it is used for a long period of time, so that the volume of the water-bloom collected can always be made small and almost no maintenance is required.

FIG. 1 is a conceptual diagram of a water-bloom concentration and recovery apparatus in which the water-bloom recovery apparatus of the present invention is integrally incorporated into a water-bloom concentration apparatus, viewed from above and from the side. Perspective view showing the part of the water-bloom concentration tank of the water-bloom concentration recovery device Cross-sectional view along line aa in FIG. FIG. 2 is a perspective view showing a plurality of rotating discs arranged in the blue-green algae collecting apparatus of the present invention. FIG. 2 is a perspective view of electrifying the rotating disk by triboelectrification in the blue-green algae collecting apparatus of the present invention. FIG. 2 is a perspective view of charging the rotating disk by plasma discharge in the algal bloom recovery apparatus of the present invention. The perspective view of another aspect of the water-bloom discharge means of the water-bloom recovery apparatus of this invention. Fig. 3 is a perspective view of another aspect of the water-bloom discharge means of the water-bloom recovery apparatus of the present invention. Explanatory diagram of the mechanism of collecting blue-green algae with the blue-green algae collecting apparatus of the present invention

Preferred embodiments of the water-bloom recovery apparatus of the present invention will be described below with reference to the accompanying drawings.

The invention is illustrated by the following preferred embodiments. Modifications may be made in many ways, and other embodiments besides this embodiment may be utilized without departing from the scope of the invention. Therefore, all changes that come within the scope of this invention are included in the claims.

The water-bloom collecting apparatus of the present invention can be directly installed in closed water areas such as lakes, ponds, rivers, and closed sea areas. is more efficient. Therefore, an example of a water-bloom concentration and recovery apparatus in which the water-bloom recovery apparatus according to the embodiment of the present invention is integrated with the water-bloom concentration apparatus will be described below.

In addition, as a method for concentrating the water-bloom with the water-bloom concentrator, any water-bloom concentrator may be used as long as the concentrated water-bloom can float near the water surface of the device. The concentration method is described below.
[Overall configuration of blue-green algae concentration and recovery device]
(A) of FIG. 1 is a conceptual diagram showing the overall configuration of the water-bloom concentration and recovery device 10 in which the water-bloom recovery device 10A of the present invention is integrally incorporated into the water-bloom concentration device 10B, and (B) is the overall configuration. is a conceptual diagram of the device viewed from the side. FIG. 2 is a perspective view showing mainly the water-bloom concentration tank portion of the water-bloom concentration recovery apparatus 10. As shown in FIG. 3 is a cross-sectional view taken along line aa of FIG. 2. FIG.

As shown in FIG. 1, a water-bloom concentration recovery apparatus 10 is placed on the bank of an enclosed water area 12 such as a lake, pond, river, or the like, in which water-bloom occurs in large numbers. First, the algal bloom concentrator 10B will be described.

[Blue-green algae concentrator]
The water-bloom concentration apparatus 10B mainly includes a water-bloom concentration tank 14, a water-bloom raw water intake means 16 for taking raw water containing blue-green algae into the water-bloom concentration tank 14, a microbubble water generation means 18, and a microbubble film formation means 20. , a blue-green algae raw water overflow means 22 and a filtered flow forming means 24 .

(Blue-green algae concentration tank)
As shown in FIGS. 2 and 3, the water-bloom concentration tank 14 is a tank for obtaining a water-bloom concentrate in which the water-bloom is concentrated on the upper side of the microbubble membrane A by filtering the raw water-bloom water with the microbubble membrane A. is supplied and the microbubble water generated by the microbubble water generating means 18 (see FIG. 1) is supplied.

The shape of the algal bloom concentration tank 14 may be any shape such as a cylindrical container or a square container as long as it is a container shape with an open top. Indicate by case. The size of the water-bloom concentration tank 14 is not particularly limited, but in the present embodiment, a square container having a square base of about 1 m in length and width and a height of about 1 m was used.

The water-bloom concentration tank 14 may be made of any material, such as metal, plastic, or wood, as long as it is sturdy enough for a water tank. board.

(Blue-green algae raw water intake means)
As shown in FIG. 1, the blue-green algae raw water intake means 16 takes the blue-green algae raw water containing the blue-green algae W (see FIG. 5) into the algal bloom concentration tank 14. It is composed of a water intake pipe 16A in which a water intake is arranged, and a water intake pump 16B.

Blue-green algae W is a relatively spherical blue-green algae (Microcystis of about several microns: Microcystis is the main constituent), and floats in the vicinity of the water surface several cm below the water surface due to intracellular gas vesicles. Therefore, the water intake port of the water intake pipe 16A is arranged near the water surface.

Further, when the water-bloom raw water is filtered by the microbubble membrane A, contaminants other than the water-bloom W, such as plastic dust, wood chips, and tree leaves, disturb the microbubble membrane A and cause bubbles to disappear. Therefore, it is preferable to provide a contaminant removal device (not shown) for removing contaminants at the water intake.

Further, when filtering the raw water with the microbubble membrane A, when the air bubbles of the blue-green algae W are destroyed by the intake pump 16B, the density of the blue-green algae itself increases, and it easily sinks after passing through the microbubble membrane A (see FIG. 3). Become. Therefore, as the type of the water intake pump 16B, it is preferable to use a pump that does not easily destroy the air bubbles of the blue-green algae W, such as a mono pump or a diaphragm pump, but these pumps are expensive. Therefore, by using a low-cost centrifugal pump without increasing the pressure on the discharge side to 0.3 MPa or more, it becomes difficult to destroy the air bubbles in the blue-green algae W, so this pump can be used under the above pressure conditions. is more preferred.

(Microbubble water generating means)
The microbubble water generating means 18 generates microbubble water containing microbubbles with a bubble diameter of micro order level, and can generate microbubble water containing microbubbles with a bubble diameter of 100 μm to 5 μm. preferable.

Microbubbles with a bubble diameter of 100 μm to 5 μm or less improve the long-term underwater retention property, the property of maintaining a small bubble diameter, and the negative charging property described in the means for solving the problem, so microbubbles with excellent filtration performance. Membrane A can be formed.

The microbubble water generating means 18 may be, for example, a pressurized dissolution method, a high-speed swirling method, an ultrasonic method, or the like, but the pressurized dissolution method is used in the present embodiment.

As shown in FIG. 1, the microbubble water generating means 18 mainly includes an air mixing pump 18A that mixes air and water under high pressure to form air-saturated water in which air is dissolved in a supersaturated state; and a decompression nozzle 18B that decompresses the air-saturated water in the air-saturated water to bubble the dissolved air dissolved from the air-saturated water.

The water used in the microbubble water generating means 18 is more likely to generate microbubbles if it contains a large amount of ionized substances and impurities, and is more likely to be industrial water, seawater, or wastewater from which foreign matter has been removed than tap water. is preferred. In this embodiment, the filtrate from the microbubble membrane A of the water-bloom concentration tank 14 is used. That is, one end of the withdrawal pipe 18C is connected to the vicinity of the bottom portion of the algae concentration tank 14, and the other end is connected to the water intake port of the air mixing pump 18A. The withdrawal tube 18C is provided with a filter (not shown) for removing foreign matter such as dust in the filtrate.

The air mixing pump 18A preferably mixes water and air under a pressure of about 0.6 MPa, and the decompression nozzle preferably rapidly reduces the pressure from 0.6 MPa to about 0.2 MPa.

(Microbubble film forming means)
The microbubble film forming means 20 continuously feeds the generated microbubble water into the liquid of the water-bloom concentration tank 14 to form a cloudy microbubble film, which is a dense layer of microbubbles, in the vicinity of the liquid surface of the water-bloom concentration tank 14. form A.

As shown in FIGS. 1 to 3, the microbubble film forming means 20 mainly includes a liquid feeding pipe 20A for feeding the microbubble water generated by the microbubble water generating means 18 into the water-bloom concentration tank 14, and a diffusion pipe 20B disposed below the bubble membrane A for diffusing the microbubble water sent by the liquid sending pipe 20A into the water-bloom concentration tank 14 .

A diffusion tube 20B for microbubble water is arranged below the microbubble membrane A, and the microbubbles are diffused throughout the algal bloom concentration tank 14, and the microbubbles spread over the entire liquid surface C (see FIG. 3). It is easy to form a uniform microbubble film A in which the film thickness does not differ depending on the portion of the microbubble film A. As a result, it is possible to eliminate variations in filtration performance depending on the portion of the microbubble membrane A.

Also, the diffusion pipe 20B has a structure in which a plurality of outlets 20C for blowing out microbubble water are drilled at equal intervals on the upper surface of at least one cylindrical pipe extending horizontally in the water-bloom concentrating tank 14 . The diffusion pipe 20B has a closed distal end and a proximal end connected to the microbubble water generating means 18 via the liquid feeding pipe 20A.

The bubbles in the microbubble water blown out from the blowout port 20C of the diffusion tube 20B slowly rise in the direction of the liquid surface of the algal bloom concentration tank 14, and a milky-white microbubble layer, which is a bubble-dense layer in which bubbles are densely packed, is formed near the liquid surface. A bubble film A is formed. The thickness of the formed microbubble film A is adjusted by the amount of microbubble water blown out from the blowout port 20C of the diffusion tube 20B.

Since the microbubbles are negatively charged, they repel each other and easily diffuse into the water-bloom concentration tank 14. Therefore, if the size of the water-bloom concentration tank 14 is the size described above, a single diffusion tube 20B will not pose a problem. For this reason, in the present embodiment, one diffusion pipe 20B is arranged horizontally in the center of the water-bloom concentration tank 14 in the width direction. However, according to the thickness distribution of the microbubble film A formed in the water-bloom concentration tank 14 and the volume of the water-bloom concentration tank 14, a plurality of diffusion tubes 20B can be arranged.

(Blue-green algae raw water overflow means)
As shown in FIG. 2, the blue-green algae raw water overflow means 22 causes the blue-green algae raw water to overflow in the vicinity of the upper membrane surface of the microbubble membrane A formed in the blue-green algae concentrating tank 14, and consists of two overflow pipes 22A. and a branch pipe 22B for branching the blue-green algae raw water taken in by the water intake pipe 16A to two overflow pipes 22A.

The overflow pipe 22A is formed by forming a slit opening 22C along the longitudinal direction on the top surface of a cylindrical pipe, and the raw water of blue-green algae overflows from the slit opening 22C as shown in FIGS.

The microbubbles forming the microbubble film A disappear due to external impact in addition to the lapse of time. Therefore, as the method of supplying the raw water-bloom water to the water-bloom concentration tank 14, it is preferable to reduce the impact of the raw water-water flow of the water-bloom water hitting the microbubble membrane A as much as possible.

In addition, since the raw water for the blue-green algae overflows from the overflow pipe 22A arranged near the upper membrane surface of the microbubble membrane A, the raw water for the blue-green algae can be supplied so as to gently rest on the microbubble membrane A. can be done. As a result, the impact on the microbubble film A can be reduced, so that the film formation of the microbubble film A can be stabilized.

Arranging the overflow tube 22A near the upper membrane surface of the microbubble membrane A means that the lower end of the circumference of the overflow tube 22A does not touch the upper surface of the microbubble membrane A, although it depends on the diameter of the overflow tube 22A. It is preferably in the vicinity of the film surface.

(Filtration flow forming means)
The filtered flow forming means 24 forms a filtered flow for filtering the overflowed raw water of algae by forming a water flow directed from the upper side to the lower side of the microbubble membrane A.

Due to this filtered flow, as shown in FIG. 3, the water-bloom raw water overflowed above the microbubble membrane A from the slit port 22C of the overflow pipe 22A of the water-bloom raw water overflow means 24 is filtered by the microbubble membrane A. , a liquid layer of a water-bloom concentrate (hereinafter referred to as "water-bloom concentrate layer B") in which water-bloom is concentrated is formed on the upper side of the microbubble membrane A.

In this case, it is important to form a filtered flow at a constant speed by discharging a liquid volume equivalent to the overflow of the water-bloom raw water from the lower side of the microbubble membrane A to the outside of the water-bloom concentration tank 14 . As a result, the microbubble membrane A is not disturbed, so the filtration performance can be improved.

Furthermore, it is important to keep the liquid level C of the water-bloom concentration tank 14 constant by discharging a liquid volume equivalent to the overflow of the water-bloom raw water from the lower side of the microbubble membrane A to the outside of the water-bloom concentration tank 14 . be. Thereby, the distance from the slit port 22C of the overflow pipe 22A of the blue-green algae raw water overflow means 24 to the upper surface of the microbubble membrane A, that is, the position of the overflow pipe 22A with respect to the microbubble membrane A can be maintained constant.

As shown in FIGS. 2 and 3, what would happen if the filtered flow forming means 24 could discharge the amount of liquid equivalent to the overflow of the raw water for algae from the lower side of the microbubble membrane A to the outside of the algae concentration tank 14? However, in the present embodiment, the L-shaped pipe 28 and the discharge pipe 30 are used.

The L-shaped pipe 28 is formed in an L shape by a horizontal portion 28A and a vertical portion 28B, and the end portion of the horizontal portion 28A is connected to the lower side of the water-bloom concentration tank 14 in communication. In addition, the vertical portion 28B of the L-shaped tube 28 is erected along the water-bloom concentration tank 14 so as to be higher than the reference liquid level of the water-bloom concentration tank 14 (for example, the height of the water-bloom concentration tank 14). The ends are open to the atmosphere. As a result, the L-shaped pipe 28 forms a U-shaped communication passage with the algae concentration tank 14 having the same liquid surface C height.

Further, the discharge pipe 30 is horizontally connected to a position at the liquid level C of the water-bloom concentration tank 14, which is the liquid level height of the L-shaped tube 28. As shown in FIG. As a result, when the liquid level C of the water-bloom concentration tank 14 becomes higher than the height of the discharge pipe 30, the filtrate of the water-bloom concentration tank 14 is discharged out of the water-bloom concentration tank 14 through the discharge pipe 30 until the liquid level C returns to the original level. be. Conversely, when the liquid level C of the water-bloom concentration tank 14 is lower than the height of the discharge pipe 30, the filtrate is not discharged from the discharge pipe 30, so the raw water for the water-bloom is supplied to the water-bloom concentration tank 14 and filtered by the microbubble membrane A. As the filtrate increases, it returns to the liquid surface C of the water-bloom concentration tank 14 .

As a result, only the amount of water overflowing into the water-bloom concentration tank 14 is discharged from the discharge pipe 30, so that the filtered flow becomes constant and the liquid level C in the water-bloom concentration tank 14 does not change. Therefore, the microbubble membrane A is less likely to be disturbed and the relationship between the overflow pipe 22A and the liquid level C of the algal bloom concentration tank 14 can always be maintained constant. can always be positioned in the vicinity of the film surface on the upper side of the .

Moreover, it is preferable that the connecting position of the horizontal portion 28A of the L-shaped pipe 28 in the water-bloom thickening tank 14 is located below the above-described diffusion pipe 20B. As a result, it is possible to prevent the bubbles forming the microbubble film A from being sucked into the L-shaped tube 28 as microbubbles of 5 μm or more, and the distance from the microbubble film A increases. It is easy to form a straight downward filtration flow instead of diagonally downward, and when microbubbles are made, microbubbles of 3μm or less and nanobubbles are mixed, so bubbles of 3μm or less that do not rise dissolve in the treated water, increasing the amount of dissolved oxygen. Since it is discharged as waste water, it is also possible to improve the water quality of lakes and marshes.

Here, as shown in FIG. 3, the liquid surface C of the water-bloom concentration tank 14 is not the upper surface of the water-bloom concentration layer B, but the water stored in the water-bloom concentration tank 14 as a preparation before the operation of the water-bloom concentration recovery apparatus 10. It means the liquid surface C of the water-bloom concentration tank 14 when the microbubble film A is formed by squeezing, and the height of the discharge pipe 30 in FIG.

(Blue-green algae colony dividing machine)
As shown in FIG. 1, the water-bloom concentration apparatus 10B is preferably provided with a water-bloom group divider 48 .

When a large amount of water-bloom W occurs in the enclosed water area 12, colonies of blue-green algae having a three-dimensional structure on a scale of several tens to several hundred μm form a mat and cover the water surface.

In the filtration method of filtering the water-bloom W using the microbubble membrane A, the water-bloom gathers together like a colony of blue-green algae and increases in density, making it easier for the water-bloom to pass through the microbubble membrane A and sink. On the other hand, small algal blooms W that do not form a colony have a low density and are difficult to pass through the microbubble film A and sink. Therefore, if the blue-green algae colony is taken as it is and filtered with the microbubble membrane A, the filtration efficiency will be poor.

However, if the gas vesicles of the blue-green algae W are destroyed when dividing the algae colony into small pieces, the density increases and the microbubble membrane A passes through and sinks.

Therefore, a water-bloom group splitter 48 is provided in the front stage of the water-bloom raw water overflow means 22 for finely dividing the water-bloom W of the water-bloom colony in the water-bloom raw water so as not to destroy the gas vesicles of the water-bloom. As a result, the efficiency of filtering water-bloom by the microbubble membrane A can be further improved. As a result, the concentration rate of the water-bloom concentrate concentrated on the upper side of the microbubble membrane A can be improved.

The water-bloom group dividing machine 48 is not particularly limited as long as it can break up the gas vesicles of the water-bloom W in the water-bloom group without destroying it. Alternatively, it is possible to use a jet stream sprayer that injects a jet stream into the water-bloom colony to such an extent that the gas vesicles of the water-bloom W are not destroyed, thereby dividing the water-bloom colony into small pieces. Moreover, by using a centrifugal pump having a vortex that does not destroy the air bubbles of the blue-green algae W as the water intake pump 16B, it is possible to perform both the water intake function of the blue-green algae raw water and the water-bloom group dividing function. The blue-green algae cluster divider 48 may be incorporated in the middle of the water intake pipe 16A as shown in FIG.
Next, the blue-green algae recovery apparatus 10A of the present invention will be described in detail.

[Blue-green algae collection device]
As shown in FIGS. 2 and 3, the water-bloom recovery apparatus 10A of the present invention mainly recovers the water-bloom W from the water-bloom concentrate concentrated on the upper side of the microbubble membrane A. Rotating disk means 26 having a rotating disk 26A made of a highly insulating material, the outer peripheral portion of which is immersed in the vicinity (the part forming the algae-enriched layer B) and which rotates vertically, and the rotating disk 26A. is positively or negatively charged to generate an attracting force for electrostatically attracting the algae W to the rotating disk 26A; and a water-bloom discharging means 36 for receiving and discharging the taken blue-green algae.

Here, the rotating disk does not necessarily have to be made of a highly insulating material, and a material such as metal can also be used. Moreover, even without the electric resistance means 32 having the function of charging the rotating disk 32, the water-bloom can be collected because the water-bloom is attracted to the rotating disk 26A. However, as a result of intensive research by the present inventors, it has been found that blue-green algae can be collected more effectively by charging the rotary disc 32 by using a highly insulating material for the rotary disc.

(Rotating disk means)
The rotating disk means 26 is mainly provided between the rotating disk 26A, the motor 26C connected to the rotating shaft 26B of the rotating disk 26A and rotating the rotating disk 26A, and the rotating disk 26A and the motor 26C. and a speed reducer 26D.

As the material of the rotating disk 26A with high insulating properties, among plastics, polyvinyl chloride, polycarbonate, acrylic resin, hard nylon, etc., which are commercially available as general-purpose products and which have particularly high insulating properties and are hard, are suitable. Available.

The rotating disk 26A rotates vertically so that the outer peripheral portion of the rotating disk 26A is always submerged in the water-bloom concentrated layer B of the water-bloom concentrated liquid concentrated on the upper side of the microbubble membrane A.

In this case, the outer peripheral portion of the rotating disk 26A is hidden in the algae-concentrated layer B, but is kept out of contact with the microbubble film A as much as possible. When the rotating disk 26A comes into contact with the microbubble film A, the microbubble film A is disturbed, which causes the film formation of the microbubble film A to become unstable.

By maintaining the liquid level C of the water-bloom concentration tank 14 constant with the filtrate flow forming means 24, the rotating disk 26A can be prevented from coming into contact with the microbubble membrane A. Furthermore, when it is desired to lower the position of the liquid level C of the water-bloom concentration tank 14 so that the rotating disc 26A does not come into contact with the microbubble membrane A, the liquid level of the L-shaped tube 28 can be lowered as shown in FIGS. It is also possible to forcibly lower the liquid level C by providing an auxiliary discharge pipe 44 and a discharge valve 46 for discharging the filtrate from the water-bloom concentration tank 14 at a position lower than the C position.

Further, the center of the rotating disc 26A is connected to a motor 26C mounted on the mount 14A of the algae concentration tank 14 via a rotating shaft 26B and a decelerator 26D. As a result, the rotating disk 26A rotates slowly while its outer peripheral portion is submerged in the water-bloom-enriched layer B, and adsorbs the water-bloom W in the water-bloom-enriched layer B by static electricity.

It is preferable that the rotational speed of the rotary disk 26A is 3 to 6 rpm. If the rotational speed of the rotary disc 26A exceeds 6 rpm, a large amount of water is collected together with the water-bloom W, and the water content of the collected water-bloom W cannot be reduced. On the other hand, if the rotational speed of the rotary disk 26A is as low as less than 3 rpm, the water content of the collected water-bloom W will be small, but the water-bloom collection efficiency will be poor.

Further, it is preferable that the rotary disc 26A has a rough surface with a large surface roughness rather than a smooth surface with a small surface roughness for adsorption of algae. Therefore, it is preferable that the rotary disc 26A is made of a material having a large surface roughness or that the rotary disc 26A is roughened.

I don't know the clear reason why the rough surface of the rotary disc 26A makes it easier to attract the algae W, but probably because the frictional force between the rotary disc and the algae W increases, the rotary disc 26A rotates in the vertical direction. It is presumed that this is because the water-bloom W adsorbed to the rotating disc that does not fall easily due to gravity.

The number of rotating discs 26A rotated by the rotating disc means 26 is not limited to one, and a plurality of them are preferably arranged in parallel as shown in FIG. Thereby, the collection speed (collection efficiency) of the blue-green algae W can be increased.

In FIG. 4, three rotary discs 26A are arranged in parallel. That is, a bearing 26E is provided on the opposite side of the water-bloom concentration tank 14 to the side where the motor 26C is arranged, and three rotating discs 26A, 26A, . . . Further, each rotary disk 26A is provided with the rake 34 and the algal bloom discharging means 36 described above.

The supporting members for supporting the three rotating discs 26A and the rakes 34 and the algae discharge means 36 provided on each of them to the algae concentration tank 14 are not shown, but any supporting member can be used as long as it has a structure that does not pose a problem in terms of strength. It's okay.

(charging means)
The charging means 32 may use any method as long as it can positively or negatively charge the rotating disk 26A. Two corona charging methods for charging the disk 26A will be described.

FIG. 5 shows the case of using the triboelectrification method, in which the rake 34 is used as the charging means 32 . In the case of the triboelectrification method, the rotary disk 26A is charged with positive or negative electricity by rubbing a substance that is easily positively charged and a substance that is easily negatively charged in the electrification series. Also, since a highly conductive material such as metal discharges soon after being charged, the present invention uses plastic with low conductivity (that is, high insulation) as the material of the rotating disk 26A.

With triboelectrification, a larger amount of charge can be accumulated on the rotating disk 26A by rubbing two substances distant in the electrification series than by rubbing two substances close in the electrification series.

Therefore, for example, when the rotating disk 26A is to be negatively charged, it is preferable to use polyvinyl chloride or polycarbonate on the negative side of the electrification series as the plastic material for the rotating disk 26A. On the other hand, as the material of the rake 34, any material can be used as long as it is a substance on the positive side of the electrification series and can exhibit a scraping function as the rake 34. In the case of the plastic rake 34, acrylic resin or Hard nylon should be used.

Conversely, when it is desired to positively charge the rotary disc 26A, it is preferable to use acrylic resin or hard nylon on the positive side of the electrification series as the plastic material for the rotary disc 26A. On the other hand, as the material of the rake 34, it is preferable to use polyvinyl chloride or polycarbonate whose electrification series is on the negative side.

(rake)
The rake 34 scrapes off the blue-green algae adhered to the rotary disc 26A by static electricity. Also used as Therefore, as shown in FIGS. 2 and 3, by providing a pair of rakes 34 in contact with both surfaces of the rotating disk 26A, both the function of scraping off the algae W and the function of charging can be provided.

The shape of the rake 34 may be any structure as long as it can scrape off the algae W statically attracted to the rotating disc 26A and transfer it to the algal bloom discharge means 36, but the embodiment of the present invention is not limited to this. Then, the rake 34 having a U-shaped radial cross section is used. One side of the U-shaped rake contacts the side surface of the rotary disk 26A (the surface that attracts the blue-green algae), and the other side is fixed inside the blue-green algae discharging member 36A of the blue-green algae discharging means 36 .

As a result, the rotary disc 26A and the rake 34 contact and rub against each other as the rotary disc 26A rotates, and the rotary disc 26A is negatively or positively charged. Therefore, the rotating disk 26A generates a water-bloom adsorption force due to static electricity.

In addition, as described above, both side surfaces of the rotating disc 26A are preferably rough surfaces having a large surface roughness. Therefore, it is more preferable that the material of the rake 34 is a metal (such as iron) that is harder than plastic and can roughen both sides of the rotating disk 26A by rubbing against each other.

FIG. 6 is a diagram of a plasma charging system in which the rotating disk 26A is charged by a corona charging device 38 as the charging means 32. As shown in FIG.

As shown in FIG. 6, the corona charging device 38 is mainly composed of a charging gun 38A, a controller 38B, a control cable 38C connecting the charging gun 38A and the controller 38B, and a power cable 38D. The charging gun 38A is formed in a U shape, and is inserted from the side of the rotating disk 26A to near the rotating shaft 26B of the rotating disk 26A so as not to contact both side surfaces of the rotating disk 26A. As a result, negative or positive ions are plasma-discharged from the U-shaped charging gun 38A to both side surfaces of the rotating disk 26A, and both side surfaces of the rotating disk 26A are charged.

As shown in FIG. 6, the position of the charging gun 38A with respect to the rotating disk 26A is a position downstream of the rake 34 when viewed from the rotation direction of the rotating disk 26A and not in contact with the water-bloom thickening layer B of the water-bloom thickening tank 14. is preferred. As a result, the rotating disk 26A, which has a large amount of static electricity immediately after being charged, and the water-bloom W meet each other, so the water-bloom W can be efficiently adsorbed.

Also, as the controller 38B, there is a controller exclusively for negative charging or a controller exclusively for positive charging, but it is preferable to use a controller for both negative and positive charging. As a result, the charging gun 38A can charge the rotating disk 26A with the same electrode as the frictional electrification in accordance with the charging electrode generated on the rotating disk 26A by the frictional electrification by the rake 34, so that the rotating disk 26A can be charged efficiently.

(Blue-green algae discharge means)
As shown in FIG. 5, the water-bloom discharge means 36 is composed of a gutter-shaped water-bloom discharge member 36A inclined downward toward the discharge direction of the water-bloom W, and the tip of the water-bloom discharge member 36A extends to the water-bloom collection container 36B. is set. A pair of rakes 34, 34 are fixed to the inside of the base ends of both side plates of the blue-green algae discharge member 36A so as to face each other. It is supported by a supporting member (not shown) of the water-bloom concentration tank 14 . Thereby, the rake 34 and the water-bloom discharge member 36A are fixed to the water-bloom concentration tank 14 .

5 to 8, one of the pair of connecting plates 35, 35 is shown with its upper portion cut away so that the rotating disk 26A and the rake 34 are not hidden.

The bottom plate of the gutter-shaped blue-green algae discharging member 36A at the base end (upper end in the inclined direction) has a linear notch so that the blue-green algae discharging member 36A does not get in the way when the rotary disc 26A rotates. (not shown) are formed.

As a result, the water-bloom W adhering to the rotating disk 26A is scraped off by the rake 34 as the rotating disk 26A rotates, and flows down to the water-bloom discharge member 36A. The water-bloom W that has flowed down to the water-bloom discharging member 36A slides on the water-bloom discharging member 36A and is collected in the water-bloom collecting container 36B.

FIG. 7 shows another mode of the water-bloom discharging means 36, in which a plurality of air blow means 40 for pushing out the water-bloom W of the water-bloom discharging member 36A in the discharging direction with air pressure is provided.

As in the water-bloom recovery apparatus 10A of the present invention, when the water-bloom W is adsorbed and recovered on the vertically rotating rotating disc 26A, the water-bloom W is dehydrated as described above and scraped onto the rake 34 in a low-moisture state. be done. For this reason, the water-bloom W in a low-moisture state may accumulate on the U-shaped rake 34 and the gutter-shaped water-bloom discharge member 36A, hindering the smooth discharge of the water-bloom W.

For this reason, as shown in FIG. 7, the pair of rakes 34 and the blue-green algae discharge member 36A are provided with a plurality of air blow means 40 for pushing out the blue-green algae W in the discharge direction with air pressure. The air blowing means 40 is mainly composed of an air nozzle 40A, a blower (not shown), and an air hose 40B connecting the air nozzle 40A and the blower.

As long as the blue-green algae W can be discharged without accumulating, the position and number of the air nozzles 40A are not limited, but in the present embodiment, as shown in FIG. A total of 4 pieces were provided on both sides of 36A.

As a result, the blue-green algae W scraped off from the rotating disc 26A by the rake 34 is sent out to the algae-bloom discharge member 36A by jetting air from the air nozzle 40A provided on the rake 34. As shown in FIG. After that, it slides down the gutter-shaped blue-green algae discharge member 36A inclined downward toward the discharge direction, and is sent to the algae collection container 36B (see FIG. 2) by the jetted air from the air nozzle 40A provided in the blue-green algae discharge member 36A. be recovered.

FIG. 8 shows another aspect of the water-bloom discharge means 36, and the water-bloom discharge means 36 is preferably provided with an inclination angle adjusting means 42 for adjusting the inclination angle of the water-bloom discharge member 36A. Thereby, the inclination angle of the water-bloom discharge member 36A can be adjusted to an inclination angle at which the water-bloom W easily slides down, and the water-bloom W can be discharged smoothly.

The tilt angle adjusting means 42 may be either manual or automatic as long as it has a structure capable of adjusting the tilt angle of the blue-green algae discharging member 36A. rice field.

As shown in FIG. 8, the inclination angle adjusting means 42 includes a rotation support member 42A that rotatably supports the blue-green algae discharging member 36A about a substantially intermediate portion in the length direction of the blue-green algae discharging member 36A, and a predetermined rotation support member 42A. and a rotation locking means 42B for fixing the rotation of the blue-green algae discharge member 36A at an inclination angle of .

That is, the rotary support member 42A is fixed to the water-bloom thickening tank 14 and the first rotary holes 50 formed in both side plates of the water-bloom discharge member 36A formed in the shape of a gutter at substantially the middle portion in the longitudinal direction. A second rotation hole 54 formed in the pair of L-shaped rotation support members 52 , 52 is rotatably connected by a rotation pin 56 . As a result, the blue-green algae discharge member 36A can rotate around the rotation pin 56 like a seesaw.

When the inclination angle adjusting means 42 is provided, it is necessary to release the connection between the blue-green algae discharge member 36A and the connection plate 35 fixed to the water-bloom concentration tank 14 so that the blue-green algae discharge member 36A can rotate. There is In this case, the water-bloom discharge member 36A is supported by the water-bloom thickening tank 14 by the rotary support members 52,52.

Further, the rotation lock means 42B is provided with a first lock hole 58 formed in both side plates of the blue-green algae discharging member 36A on the tip end side of the blue-green algae discharging member 36A relative to the position of the inclination angle adjusting means 42, and It is inserted into a plurality of second lock holes 62, 62, . It is composed of a locking pin 64 that

A plurality of second lock holes 62 are formed at positions corresponding to the inclination of the blue-green algae discharging member 36A. As a result, when the lock pin 64 is inserted into the first lock hole 58 formed in both side plates of the algae discharge member 36A and the uppermost second lock hole 62 formed in the lock post 60, the algae discharge member 36A is discharged. The inclination of the member 36A is the smallest. Further, when the lock pin 64 is inserted into the second lock hole 62 at the bottom, the slope of the blue-green algae discharging member 36A is maximized.

In this embodiment, three second lock holes 62 are formed so that the inclination angle can be changed in three steps, but the number is not limited to this.

Thus, the inclination angle of the water-bloom discharging member 36A can be adjusted according to the ease with which the water-bloom W slides down the water-bloom discharging member 36A, that is, the water content of the water-bloom W scraped off by the rake 34 . Therefore, the water-bloom W can be smoothly collected into the water-bloom collecting container 36B.

Although not shown, the algal bloom discharging means 36 may be provided with both the air blowing means 40 and the tilt angle adjusting means 42 .
[Method for concentrating and recovering blue-green algae]
Next, a method of concentrating and recovering the water-bloom W by the water-bloom concentration recovery device 10 incorporating the water-bloom recovery device 10A of the present invention into the water-bloom concentration device 10B will be described.

In the water-bloom collecting apparatus 10A of the present invention, the method of electrifying the rotating disc 26A by friction between the rotating disc 26A and the rake 34 will be described. Of course, it may be electrified.

First, water that does not contain blue-green algae, such as industrial water or water taken from the enclosed water area 12 and freed of algae and contaminants, is stored in the water-bloom concentration tank 14 of the water-bloom concentrator 10B. That is, water is supplied to the water-bloom concentration tank 14 and stored until the depth of water stored in the water-bloom concentration tank 14 reaches the height of the discharge pipe 30 of the filtrate flow forming means 24 . When the water depth stored in the water-bloom concentration tank 14 exceeds the height of the discharge pipe 30, the water is discharged from the discharge pipe 30, so that the liquid level C of the water-bloom concentration tank 14 is set.

Next, the microbubble generating means 18 is operated to discharge microbubble water from the air diffuser 20B of the microbubble film forming means 20, and the microbubble film A, which is a dense layer in which the microbubbles are densely packed, is formed near the liquid surface C. to form This completes the pre-preparation for water-bloom concentration.

Next, the water intake port of the water intake pipe 16A of the blue-green algae raw water intake means 16 is placed near the water surface of the enclosed water area 12 so as not to move, and the water intake pump 16B is operated. As a result, the water-bloom raw water containing the water-bloom floating near the water surface of the closed water area 12 is taken into the water-bloom concentration tank 14 .

At the same time, the motor 26C of the blue-green algae collecting device 26 of the present invention is driven to slowly rotate the rotary disc 26A (3 to 6 rpm) via the speed reducer 26D.

Then, the blue-green algae raw water taken in by the water intake pump 16B is caused to overflow above the microbubble membrane A from the slit openings 22C of the two overflow pipes 22A of the water-bloom raw water overflow means 22. - 特許庁As a result, the amount of water stored in the water-bloom concentration tank 14 becomes higher than the liquid surface C, and the increased amount of water-bloom is discharged from the water-bloom concentration tank 14 through the discharge pipe 30 of the filtered flow forming means 24 . Therefore, in the water-bloom concentrating tank 14, a filtration flow directed from the upper side to the lower side of the microbubble membrane A is automatically formed. As a result, the blue-green algae raw water is filtered by the microbubble membrane A.

As a result of this filtration, only water in the water-bloom raw water permeates the microbubble membrane A to become a filtrate, and on the upper side of the microbubble membrane A, a liquid layer of water-bloom concentrated liquid in which the water-bloom is concentrated is formed. That is, by the operation of the water-bloom concentrating device 10B, as shown in FIG.

In the blue-green algae concentration device 10B, the microbubbles forming the microbubble membrane A are destroyed and disappear by time or impact. It becomes necessary to keep the density of the bubbles constant.

Not only is the microbubble water containing microbubbles continuously fed into the liquid of the water-bloom concentration tank 14, but also the overflow pipe 22A for overflowing the water-bloom raw water near the upper membrane surface of the microbubble membrane A is provided. The overflow amount of the raw water and the discharge amount from the blue-green algae thickening tank 14 were made equal.

As a result, the overflow pipe 22A can always be positioned near the surface of the microbubble film A, so that the impact of the overflowing blue-green algae water on the microbubble film is reduced, and the bubbles are less likely to be destroyed. The membrane A is less likely to sway, and the denseness of air bubbles can be easily maintained. As a result, the thickness of the microbubble film A and the denseness of the bubbles can be kept constant. Thereby, the membrane formation of the microbubble membrane A can be stabilized, and the raw water of blue-green algae can be efficiently filtered.

According to the water-bloom concentrator 10B, it is possible to increase the concentration rate of the collected water-bloom to 70% or more. Further, since the water-bloom concentration apparatus 10B uses the microbubble membrane A as a filter membrane for filtering the water-bloom from the water-bloom raw water, the phenomenon of clogging with the water-bloom does not occur. Thereby, the almost maintenance-free algal bloom concentrator 10B can be configured.

The water-bloom W in the water-bloom concentrate concentrated on the upper side of the microbubble membrane A of the water-bloom concentrator 10B adheres to the rotating disk 26A of the water-bloom recovery device 26 of the present invention. Then, the water-bloom W adhering to the rotating disk 26A is scraped off by the rake 34 and collected in the water-bloom recovery container 36B via the water-bloom discharge member 36A.

FIG. 9 is a diagram for explaining the water-bloom recovery mechanism of the water-bloom recovery device 10A of the present invention, in the case where the rotating disk 26A is negatively charged.

As shown in FIG. 9A, when the negatively charged rotating disc 26A and the blue-green algae W approach each other, since the electric lines of force K are emitted from the rotating disc 26A, the protons (+) of the algal bloom W are attracted and electrons (-) are repelled. That is, as shown in FIG. 9B, a portion of the algae W close to the rotating disk 26A is positively charged, and a portion of the algal bloom W far from the rotating disc 26A is negatively charged, so-called electrostatic induction occurs. .

Therefore, as shown in FIG. 9C, the negatively charged rotating disk 26A and the positively charged portion of the water-bloom W attract each other, and the water-bloom W is attracted to the rotating disk 26A.

As described above, according to the water-bloom collecting apparatus 10A of the present invention, the water-bloom W is adsorbed and collected by the static electricity charged on the rotating disk 26A. never. Therefore, even if the water-bloom collecting apparatus 10A is used for a long period of time, the water-bloom collecting performance does not deteriorate and maintenance is hardly required.

Further, since the rotating disk 26A that adsorbs the algae W rotates vertically, the moisture in the algae W is removed from the rotating disk 26A by gravity until the water-bloom W is scraped off from the rotating disk 26A by the rake 34. It runs down the surface of 26A. As a result, the water-bloom W is dehydrated, so that the water-bloom W can be recovered in a low-moisture state.

As described above, the water-bloom collecting apparatus 10A of the present invention is a method of dehydrating the water of the water-bloom W adsorbed on the rotating disk 26A by gravity. Therefore, the water-bloom W can be collected in a low-moisture state, and the volume of the collected water-bloom W can always be made small.

Although not shown, when the positively charged rotating disk 26A and the blue-green algae W approach each other, since the electric line of force K is emitted from the rotating disk 26A, the electrons (-) of the water-bloom W are attracted and the protons are attracted. (+) is kept away. That is, a portion of the water-bloom W close to the rotating disk 26A is negatively charged, and a portion of the water-bloom W far from the rotating disk 26A is positively charged. be done.

In the natural world, the surface of algae such as blue-green algae W is said to be negatively charged, and it is better to charge the rotating disk 26A positively rather than negatively in terms of charging efficiency. Conceivable.

Further, as described above, by roughening the surface of the rotating disc 26A, the algae W can be held on the rotating disc 26A by both electrostatic force and frictional force, and the collection speed can be increased. Therefore, the blue-green algae W can be collected more efficiently.

DESCRIPTION OF SYMBOLS 10... Blue-green algae concentration recovery apparatus 10A... Blue-green algae recovery apparatus 10B... Blue-green algae concentrator 12... Closed water area 14... Blue-green algae concentration tank 14A... Mounting base 16... Blue-green algae raw water intake means 16A... Water intake pipe 16B... Water intake pump 18 Microbubble water generating means 18A Air mixing pump 18B Decompression nozzle 18C Withdrawal tube 20 Microbubble film forming means 20A Liquid feeding pipe 20B Diffusion tube 20C Blowout port 22... Blue-green algae raw water overflow means, 22A... Overflow pipe, 22B... Diverting pipe, 22C... Slit opening, 24... Filtration flow forming means, 26... Rotating disc means, 26A... Rotating disc, 26B... Rotating shaft, 26C...Motor 26D...Reducer 28...L-shaped tube 28A...Horizontal portion 28B...Vertical portion 30...Discharge pipe 32...Charging means 34...Rake 35...Connecting plate 36...Blue-green algae discharging means, 36A... blue-green algae discharge member 36B... blue-green algae recovery container 37... bolt 38... corona charging device 38A... charging gun 38B... controller 38C... control cable 38D... power supply cable 40... air blow means 40A... air Nozzle 40B Air hose 42 Inclination adjusting means 42A Rotating means 42B Rotation locking means 44 Auxiliary discharge pipe 46 Discharge valve 48 Blue-green algae group dividing machine 50 First round Movement hole 52 Rotation support member 54 Second rotation hole 56 Rotation pin 58 First lock hole 60 Lock support 62 Second lock hole 64 Lock pin A... microbubble membrane, B... water-bloom concentrated layer, C... liquid surface, K... electric lines of force, W... water-bloom

Claims (13)

In the blue-green algae recovery device for recovering blue-green algae floating near the water surface,
rotating disk means having a rotating disk whose outer peripheral portion is immersed in the vicinity of the water surface and which rotates vertically;
a rake for scraping off the blue-green algae adsorbed on the rotating disc;
A water-bloom recovery device comprising: a water-bloom discharge means for receiving and discharging the water-bloom scraped off by the rake. 2. A water-bloom collecting apparatus according to claim 1, further comprising charging means for positively or negatively charging said rotating disk to generate an attracting force for attracting said water-bloom to said rotating disk by static electricity. The blue-green algae collection device is
3. The water-bloom collecting apparatus according to claim 1 or 2, comprising a water-bloom concentrating device for concentrating the water-bloom from the water-bloom raw water containing the water-bloom. 4. The algal bloom collecting apparatus according to any one of claims 1 to 3, wherein the rotating disc is made of a highly insulating plastic material. 5. The algal bloom collecting apparatus according to any one of claims 1 to 4, wherein the rotating disk is made of any one of polyvinyl chloride, polycarbonate, acrylic resin, and hard nylon. 6. The algal bloom recovering apparatus according to any one of claims 1 to 5, wherein the rotating disc is made of a material having a large surface roughness, or the rotating disc is roughened. The algal bloom collecting apparatus according to any one of claims 1 to 6, wherein the rotation speed of the rotating disc is 3 to 6 rpm. 3. The algal bloom collecting apparatus according to claim 2 , wherein said charging means is said rake, and said rotating disc is charged with positive or negative electricity by friction between said rotating disc and said rake. 9. The algal bloom collecting apparatus according to any one of claims 1 to 8, wherein the rotating disc means comprises a plurality of rotating discs arranged in parallel. The water-bloom collecting apparatus according to any one of claims 1 to 9, wherein the water-bloom discharging means is a gutter-shaped water-bloom discharging member inclined downward toward the discharging direction. 11. A water-bloom collecting apparatus according to claim 10, wherein said water-bloom discharging means has an air blow means for pushing out the water-bloom of said water-bloom discharging member in said discharging direction with air pressure. 12. The algae bloom collecting apparatus according to claim 10, wherein the algae bloom discharging means is provided with inclination angle adjusting means for adjusting the inclination angle of the algae bloom discharging member. The blue-green algae concentrator,
a blue-green algae concentration tank;
a blue-green algae raw water intake means for taking in the blue-green algae raw water into the blue-green algae concentration tank;
a microbubble water generating means for generating microbubble water containing microbubbles having a bubble diameter on the micro order level;
a microbubble film forming means for forming a microbubble film, which is a dense layer of microbubbles, in the vicinity of the liquid surface of the water-bloom concentration tank by continuously feeding the generated microbubble water into the liquid of the water-bloom concentration tank; ,
a blue-green algae raw water overflow means having an overflow pipe for overflowing the blue-green algae raw water above the formed microbubble film;
The amount of liquid equivalent to the amount of overflow of the water-bloom raw water is discharged from the lower side of the microbubble membrane to the outside of the water-bloom concentration tank to form a flow from the upper side to the lower side of the microbubble membrane, thereby causing the overflow. 4. The water-bloom collecting apparatus according to claim 3, further comprising filtered stream forming means for forming a filtered stream for filtering the raw water of algae with the microbubble membrane.

Images