JP2020116515A - Microcystis concentration and recovery system - Google Patents

Abstract

To provide a microcystis recovery system capable of recovering microcystis from microcystis water efficiently without maintenance and with low running costs.SOLUTION: A microcystis concentration tank 14, means 16 for supplying microcystis water to the microcystis concentration tank 14, microbubble water generation means 18, means 20 for forming a microbubble membrane A in the vicinity of the liquid surface in the microcystis concentration tank 14 after supplying microbubble water into the microcystis concentration tank 14, microcystis water overflowing means 22 for overflowing microcystis water above the microbubble membrane A, filtration flow formation means 24 for discharging a liquid volume equivalent to the amount of microcystis water overflowing from the bottom of the microcystis membrane A to the outside of the microcystis concentration tank 14 and forming a filtration flow, and microcystis recovery means 26 for recovering microcystis concentrated on the upper side of the microbubble membrane A by filtration outside the microcystis concentration tank 14.SELECTED DRAWING: Figure 2

Description

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

In closed water areas such as lakes, ponds, and rivers, nutrient concentrations of phosphorus and nitrogen in the water may increase, and a large amount of phytoplankton called water-bloom may occur.

If nutrients can be quickly removed from eutrophic water, it is possible to purify water with aquatic plants and moderate phytoplankton. However, it is difficult to quickly remove nutrients dissolved in water, and a large amount of water-bloom is easily generated.

If a large amount of blue-green algae is left unattended, the oxygen concentration in the water area will drop and fish will die, or tap water from the waterside or water in that area will have an offensive odor. Therefore, it is necessary to improve the cause of eutrophication in the enclosed water area and at the same time, to efficiently remove the generated water-bloom to remove it from the enclosed water area.

Examples of water-bloom recovery devices that efficiently recover water-bloom from such closed water areas include Patent Document 1 and Patent Document 2.

The water-bloom recovery device of patent document 1 transfers the turbid water containing the water-bloom taken from the location where the water-bloom exists, such as a lake and a pond, to a filtration part. The transferred turbid water is filtered by a filter provided in the filter section to separate the water containing the high-concentration water-bloom and the water containing the water-bloom. Then, it is said that the water-bloom adhering to the filtration filter can be efficiently collected by scraping off the water-bloom with the brush.

In addition, the water bottom sediment active purification device of the water area of Patent Document 2 takes in raw water containing pollutants (including water-blooms) of water areas such as ponds to a flotation separation aggregate collection device. Then, the pollutant is aggregated by injecting the aggregating agent into the raw water and stirring. After that, it is said that the contaminants can be efficiently separated and removed from the water by floating the aggregates by fine bubbles (for example, microbubbles), and the separated and removed contaminants can be recovered.

JP, 2007-098342, A JP, 2003-117562, A

However, in the water-blowing recovery device of Patent Document 1, the filtration filter is likely to be clogged during use. For this reason, it is necessary to wash the filtration filter frequently, and there is a problem that maintenance is difficult.

In addition, the water bottom sediment active purification device of Patent Document 2 performs floatation separation by microbubbles, but uses a flocculant to efficiently float and separate pollutants (including water-bloom) pollutants. Therefore, there is a problem that the running cost becomes high.

From such a background, there is a demand for a water-bloom recovery device which can efficiently recover water-bloom from raw water of water-bloom, which can be easily maintained and whose running cost can be reduced.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a water-bloom recovery device that can efficiently recover water-bloom from water-bloom raw water, that is, substantially maintenance-free, and that can reduce running costs.

In order to achieve the object, the water-bloom concentration and recovery device of the present invention, in the water-bloom concentration and recovery device that concentrates and recovers water-bloom from the water-bloom containing water-bloom containing water-bloom, the water-bloom concentration tank and the water-bloom water that feeds the water-bloom water to the water-bloom concentration tank Raw water intake means, microbubble water generating means for generating microbubble water containing microbubbles with a bubble diameter of micro-order level, and the generated microbubble water are continuously fed into the liquid of the water-bloom concentrating tank. Microbubble film forming means for forming a microbubble film, which is a bubble-concentrated layer of microbubbles, in the vicinity of the liquid surface of the concentrating tank, and the water-bloom raw water overflows above the formed microbubble film (preferably near the upper film surface). A water raw water overflow means that has an overflow pipe that allows the liquid to flow from the lower side of the micro bubble film to the outside of the water bubble concentrator by discharging a liquid amount equivalent to the water flow rate of the raw water from the micro bubble film toward the lower side. By forming a filtration flow forming means for forming a filtration flow for filtering the raw water of the overflowing water-bloom by the microbubble membrane, and collecting the water-bloom concentrated on the upper side of the microbubble membrane by filtration to the outside of the water-blowing tank. And a water-bloom collecting means.

The inventor of the present invention has found that the bubble diameter is extremely small and the buoyant force applied to the bubble is also small, so that the floating speed is extremely slow and the time of staying in water is long (characteristic of long-term stay in water). The characteristics of the microbubbles (small bubble diameter maintaining property), which means that they can be uniformly dispersed in the liquid for a long time with small bubble diameters because they are not charged and are unlikely to coalesce and absorb bubbles, and algae such as water-bloom Is charged negatively and repels the microbubbles (negative charging property), and by filtering the water-white water containing the water-bloom containing the water-bloom with the microbubble film, which is a bubble-packed layer of the microbubbles. The present invention was constructed based on the idea that an Aoko concentration and recovery apparatus having a filtration membrane that is efficient and maintenance-free can be constructed by concentrating and recovering.

According to the water-bloom concentration and recovery device of the present invention, a microbubble film is formed in the vicinity of the liquid surface of the water-bloom concentration tank, and the water-bloom containing the water-bloom containing the water-bloom on the upper side of the microbubble film overflows, and the overflow rate of the water-bloom raw water An equivalent amount of liquid is discharged from the lower side of the microbubble membrane to form a filtered flow from the upper side of the microbab membrane to the lower side in the water-bloom concentration tank.

As a result, the water-bloom is concentrated on the upper side of the microbubble membrane, so that the water-bloom can be efficiently collected from the water-bloom raw water. Moreover, the microbubble film does not become clogged and no coagulant is required. If a coagulant is used, the density becomes high, and the microbubble film is rather sunk, so that the filtration performance is deteriorated. Therefore, it is possible to provide a water-bloom concentration and recovery device that is substantially maintenance-free and that can reduce running costs.

Further, not only is microbubble water continuously fed into the liquid of the water-bloom concentrating tank to form a microbubble film, but an overflow pipe is also provided near the membrane surface above the microbubble film to overflow the water-bloom raw water. , The impact on the micro-bubble membrane by the water flow of raw water of Aoko was minimized.

Further, by discharging a liquid amount equivalent to the overflow amount of the raw water of the water-bloom from the lower side of the microbubble membrane to form a filtration flow from the upper side to the lower side of the microbab membrane in the water-bloom concentration tank, the water-bloom concentration tank is formed. The liquid surface of was kept constant. Therefore, the position of the overflow pipe with respect to the microbubble film can be always located in the vicinity of the film surface, so that it is possible to prevent the impact on the microbubble film due to the supply water flow of the water-blooming raw water from changing with a small amount.

As a result, the bubbles forming the microbubble film are less likely to disappear due to the impact, so that the microbubble film can be stably formed.

In the present invention, it is preferable that the microbubble water producing means produces microbubble water containing microbubbles having an average bubble diameter of 5 μm or less.

This is a structure for stably forming the microbubble film. As described above, the microbubbles having an average bubble diameter of 5 μm or less are further improved in the above-mentioned long-time stay property in water, the small bubble diameter maintaining property, and the negative charging property, and the microbubble membrane can be stably formed, so that the filtration efficiency is improved. An excellent microbubble film can be formed.

In the present invention, the microbubble film forming means includes a liquid feeding pipe for feeding the microbubble water generated by the microbubble water generating means into the water-concentration tank, and a liquid feeding pipe arranged below the microbubble film. And a diffusion pipe for diffusing the microbubble water sent in (1) into the water-bloom concentration tank.

By disposing a diffusion tube of microbubble water below the microbubble film and facilitating the diffusion of microbubbles over the entire liquid surface of the water-concentration tank, the film thickness will not vary depending on the part of the microbubble film. A thick microbubble film can be formed. As a result, it is possible to eliminate variations in filtration performance due to the portion of the microbubble film.

In the present invention, the filtration flow forming means is erected along the water-concentration tank so that one end is opened below the diffusion pipe and the other end is opened to the atmosphere at a position higher than the liquid surface of the water-concentration tank. An L-shaped pipe that forms a U-shaped communication passage having the same liquid level height with the water-bloom concentration tank, and a discharge connected to the position of the liquid level height of the L-shaped tube to discharge the liquid from the water-bloom concentration tank. And a tube.

As a result, the amount of the overflow flow into the water-bloom concentration tank is discharged from the discharge pipe, so that the liquid level of the water-bloom concentration tank does not change. Therefore, since the overflow pipe is not submerged in the raw water of the water-bloom, the position of the overflow pipe with respect to the microbubble membrane can always be located near the membrane surface.

In the present invention, the water-bloom collecting means has an overflow port in the water-bloom concentrated layer which is a liquid layer of the water-bloom concentrated solution containing the water-bloom concentrated on the upper side of the microbubble film, and the water-bloom concentrated solution is discharged to the outside of the water-bloom concentrated tank. It is a water-bloom concentrated liquid discharge pipe. This is one mode of the water-bloom recovery means, and is the case of recovering the water-bloom concentrate as it is.

In the present invention, the water-bloom collecting means is such that the outer peripheral portion is immersed in the water-bloom concentrated layer, which is a liquid layer of the water-bloom concentrated solution containing the water-bloom concentrated on the upper side of the microbubble film, and the surface rotates positively while rotating vertically. The rotating disk, the rake for scraping off the water-bloom adsorbed on the rotating disk, and the water-bloom discharging member for discharging the water-bloom scraped off by the lake to the outside of the water-bloom concentrating tank.

This is another mode of the water-bloom collecting means, and is the case where the water-bloom is further collected from the water-bloom concentrate. According to the water-blowing recovery means, the positively-charged water-blooming liquid of the water-bloom concentrated liquid is efficiently adsorbed to the rotation disk by rotating so that the outer peripheral portion of the water-blooming disk is submerged in the water-bloom concentrated layer. .. The adsorbed water-bloom is scraped off by a rake and is discharged to the outside of the water-bloom concentration tank by the water-bloom discharge member. As a result, it is possible to collect the water-bloom in a more concentrated state as compared with the case where the water-bloom concentrate is directly discharged to the outside of the water-bloom concentration tank.

In the present invention, in front of the water-bloom raw water overflow means, there is provided a water-bloom group dividing machine that breaks down the group-shaped water-blooms in the water-bloom raw water into fine pieces so as not to destroy the water cells of the water-bloom.

When a large number of water-blooms are generated, colonies of water-blooms having a three-dimensional structure of tens to hundreds of μm form a mat and cover the water surface. In the present invention, a water-bloom group dividing machine is provided in front of the water-bloom raw water overflow means so as to finely divide the group-shaped water-bloom in the water-bloom raw water so as not to destroy the gas bubbles of the water-bloom. As a result, the density of the water-bloom that is filtered by the micro-bubble membrane is reduced and the micro-bubble membrane is less likely to settle, so that the efficiency of filtering the water-bloom by the micro-bubble membrane can be further improved.

Advantageous Effects of Invention According to the present invention, it is possible to provide a water-bloom concentrating and collecting apparatus that can efficiently collect water-bloom from water-blooming raw water, that is, substantially maintenance-free, and that can reduce running costs.

The conceptual diagram of the whole structure which looked at the water-bloom concentration and recovery apparatus of this invention from the upper side and the side. Perspective view showing the part of the water-bloom concentration tank of the water-bloom concentration and recovery device Sectional drawing which followed the aa line of FIG. A perspective view of another aspect of the water-bloom collecting means in the water-bloom concentration and collection device. Sectional drawing which followed the aa line of FIG. Conceptual diagram of a water-bloom concentration and recovery device with a water-bloom group dividing machine incorporated

Hereinafter, preferred embodiments of a water-bloom concentration and recovery apparatus of the present invention will be described with reference to the accompanying drawings.

The present invention will be described by the following preferred embodiments. Modifications can be made in many ways without departing from the scope of the invention, and other embodiments other than this embodiment can be used. Therefore, all the modifications within the scope of the present invention are included in the claims.
[Overall structure of water-bloom concentration and recovery device]

FIG. 1A is a conceptual view of the overall structure of the water-bloom concentration and recovery apparatus 10 as seen from above, and FIG. 1B is a conceptual view of the overall configuration as viewed from the side. Further, FIG. 2 is a perspective view mainly showing a part of the water-bloom concentration tank of the water-bloom concentration and recovery device. Further, FIG. 3 is a cross-sectional view taken along the line aa of FIG.

As shown in FIG. 1, the water-bloom concentration and recovery apparatus 10 is arranged on the shore of a closed water area 12 such as a lake, a pond, or a river where a large number of water-blooms are generated.

The water-bloom concentration and recovery device 10 mainly includes a water-bloom concentration tank 14, a water-bloom raw water intake means 16 for taking water-bloom raw water containing water-bloom to the water-bloom concentration tank 14, a micro-bubble water producing means 18, and a micro-bubble film forming means 20. And a water-bloom raw water overflow means 22, a filtration flow forming means 24, and a water-bloom collecting means 26.
(Aoko concentrate tank)

As shown in FIGS. 2 and 3, the water-bloom concentrating tank 14 is a tank that obtains a water-bloom concentrated liquid in which the water-bloom is concentrated on the upper side of the micro-bubble membrane A by filtering the water-bloom raw water with the micro-bubble membrane A. Is supplied, and the microbubble water generated by the microbubble water generation means 18 is also supplied.

The shape of the water-concentrating tank 14 may be any shape such as a cylindrical container shape or a square container shape as long as it is a container shape with an open upper surface, but in the present embodiment, as shown in FIG. Show in case. The size of the water-bloom concentration tank 14 is not particularly limited, but in the present embodiment, a square container shape having a square base having a vertical and horizontal size of about 1 m and a height of about 1 m was used.

The material of the water-bloom concentrating tank 14 may be any material such as metal, plastic, wood, etc. as long as it is sturdy as a water tank, but in the present embodiment, the water-blooming tank 14 made of metal is used. I was there.
(Aoko raw water intake method)

As shown in FIG. 1, the water-blooming raw water intake means 16 is to take the water-blooming water containing the water-bloom to the water-bloom concentrating tank 14. For example, the water intake is arranged in a closed water area 12 such as a pond where the water-bloom is growing. The intake pipe 16A and the intake pump 16B.

Blue-green algae are relatively spherical cyanobacteria (mainly composed of microcystis of about several microns: Microcystis) and are suspended in surface water several cm below the water surface by intracellular gas vesicles. Therefore, the intake port of the intake pipe 16A is arranged near the water surface.

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

Further, as in the present invention, when the raw water of the water-bloom is filtered by the microbubble membrane A, when the water bubbles of the water-bloom are broken by the water intake pump 16B, the density of the water-bloom itself becomes large and the water easily passes through the microbubble membrane A and sinks. Become. Therefore, as the type of the water intake pump 16B, a pump that does not easily break the bubbles of water-bloom, such as a mohno pump or a diaphragm pump, is preferable.
(Micro bubble water generation means)

The micro-bubble water producing means 18 produces micro-bubble water containing micro-bubbles having a bubble diameter of the order of micro, and is capable of producing micro-bubble water containing micro-bubbles having an average bubble diameter of 5 μm or less. preferable.

Since the microbubbles having an average bubble diameter of 5 μm or less are further improved in the property of staying in water for a long time, the property of maintaining the small size of the bubbles, and the negative charging property described above, the microbubble membrane having excellent filtration performance. A can be formed.

The microbubble water generating means 18 may be any of a pressure dissolution method, a high-speed swirl method, an ultrasonic method, etc., but in this embodiment, the pressure dissolution method is used.

As shown in FIG. 1, the micro-bubble water generating means 18 mainly includes an air mixing pump 18A that forms air saturated water in which air is dissolved in a supersaturated state by mixing air and water under high pressure, and under high pressure. And a decompression nozzle 18B that foams dissolved air dissolved from the air-saturated water by decompressing the air-saturated water in the.

As for the water used in the micro-bubble water generation means 18, water containing a large amount of ionized substances and impurities is more likely to generate micro-bubbles, and is more suitable as industrial water, sea water, or wastewater from which foreign substances have been removed than tap water. Is preferred. In the present embodiment, the filtrate using the microbubble membrane A in the water-bloom concentrating tank 14 is used. That is, one end of the extraction pipe 18C is connected to the vicinity of the bottom of the water-bloom concentration tank 14, and the other end is connected to the water intake port of the air mixing pump 18A. The extraction pipe 18C is provided with a filter (not shown) for removing foreign matters such as dust in the filtrate.

The air mixing pump 18A preferably mixes water and air under a pressure of around 6 MPa, and the depressurizing nozzle preferably rapidly depressurizes from 6 MPa to around 2 MPa.
(Micro bubble film forming means)

The micro-bubble film forming means 20 continuously feeds the generated micro-bubble water into the liquid of the water-bloom concentrating tank 14 to form a cloudy micro-bubble film, which is a bubble dense layer of micro-bubbles, near the liquid surface of the water-bloom concentrating tank 14. Form A.

As shown in FIG. 1 to FIG. 3, the microbubble film forming means 20 mainly comprises a liquid feed pipe 20A for feeding the microbubble water produced by the microbubble water producing means 18 into the water-bloom concentrating tank 14 and a micropipe. A diffusion pipe 20B which is disposed below the bubble film A and which diffuses the micro-bubble water sent through the liquid sending pipe 20A into the water-bloom concentrating tank 14.

By disposing a microbubble water diffusion pipe 20B below the microbubble film A and diffusing the microbubbles over the entire liquid surface C of the water-concentration tank 14, the film thickness varies depending on the portion of the microbubble film A. It is easy to form a uniform micro-bubble film A that does not have any. As a result, it is possible to eliminate variations in filtration performance due to the portion of the microbubble film A.

Further, the diffusion pipe 20B is formed in a structure in which a plurality of air outlets 20C for blowing out micro-bubble water are formed at equal intervals on the upper surface of at least one cylindrical pipe extending horizontally in the water-bloom concentration tank 14. The tip end of the diffusion pipe 20B is closed, and the base end thereof is connected to the microbubble water producing means 18 via the liquid supply pipe 20A.

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

Since the microbubbles are negatively charged with each other and easily repel each other and diffuse into the water-bloom concentrating tank 14, one diffusion tube 20B is not a problem as long as it has the size of the water-bloom concentrating tank 14 described above. For this reason, in the present embodiment, one diffusion tube 20B is horizontally arranged in the middle of the water-bloom concentration tank 14 in the width direction. However, a plurality of diffusion tubes 20B can be arranged 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.
(Means for overflowing Aoko raw water)

As shown in FIG. 2, the water-bloom raw water overflow means 22 overflows the water-bloom raw water near the upper film surface of the microbubble film A formed in the water-bloom concentrating tank 14, and has two overflow pipes 22A. And a diversion pipe 22B that diverts the water-bloom raw water taken by the water intake pipe 16A into two overflow pipes 22A.

The overflow pipe 22A is formed by forming a slit port 22C on the upper surface of a cylindrical pipe along the length direction, and the water-bloom raw water overflows from the slit port 22C as shown in FIGS. 2 and 3.

The microbubbles forming the microbubble film A disappear by an external impact other than the passage of time. Therefore, as a method for supplying the water-bloom raw water to be supplied to the water-bloom concentration tank 14, it is preferable that the impact of the water supply flow of the water-bloom raw water that hits the microbubble film A be as small as possible.

In the present invention, since the water-blooming raw water is made to overflow from the overflow pipe 22A arranged near the membrane surface above the micro-bubble membrane A, the water-blooming raw water is supplied so as to be gently placed on the micro-bubble membrane A. can do. 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 pipe 22A near the upper film surface of the micro bubble film A depends on the diameter of the overflow pipe 22A, but the lower end of the circumference of the overflow pipe 22A does not contact the upper surface of the micro bubble film A. It is preferably near the film surface.
(Means for forming filtered flow)

The filtered flow forming means 24 forms a filtered flow for filtering the raw water of the blue-green alga overflowed by forming a water flow from the upper side to the lower side of the microbubble film A with the microbubble film A.

As a result of this filtered flow, as shown in FIG. 3, the water-bloom raw water overflowed from the slit port 22C of the overflow pipe 22A of the water-bloom raw water overflow means 24 to the upper side of the microbubble film A is filtered by the microbubble film A. On the upper side of the micro bubble film A, a liquid layer of a blue-green alga concentrated liquid in which a blue-green alga is concentrated (hereinafter, referred to as “blue-green alga concentrated layer B”) is formed.

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

Furthermore, it is important to maintain the liquid level C of the water-bloom concentration tank 14 at a constant level by discharging a liquid amount equivalent to the overflow rate of the water-bloom raw water from the lower side of the microbubble film A to the outside of the water-bloom concentration tank 14. is there. Thereby, the distance from the slit port 22C of the overflow pipe 22A of the water-bloom raw water overflow means 24 to the upper surface of the microbubble film A, that is, the position of the overflow pipe 22A with respect to the microbubble film A can be kept constant.

As shown in FIGS. 2 and 3, as the filtration flow forming means 24, what is required as long as it is possible to discharge a liquid amount equivalent to the overflow amount of the water-bloom raw water from the lower side of the microbubble film A to the outside of the water-bloom concentration tank 14. However, in the present embodiment, the L-shaped pipe 28 and the discharge pipe 30 are used.

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

Further, the discharge pipe 30 is horizontally connected to the position of the liquid level of the L-shaped tube 28 which is the liquid level C of the water-concentrating tank 14. 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 filtered liquid of the water-bloom concentration tank 14 is discharged from the water discharge pipe 30 to the outside of the water-bloom concentration tank 14 until it returns to the original liquid level C. It On the contrary, when the liquid level C of the water-bloom concentration tank 14 is lower than the height of the discharge pipe 30, the filtered liquid is not discharged from the water discharge pipe 30, so that the water-bloom raw water is supplied to the water-bloom concentration tank 14 and filtered by the micro bubble membrane A. By increasing the amount of filtrate, the liquid returns to the liquid surface C of the water-bloom concentration tank 14.

As a result, the discharge flow is discharged from the discharge pipe 30 by the amount of the overflow flow into the water-bloom concentration tank 14, so that the filtered flow has a constant velocity and the liquid level C of the water-bloom concentration tank 14 does not change. Therefore, the microbubble film A is less likely to be disturbed, and the relationship between the overflow pipe 22A and the liquid level C of the water-concentration tank 14 can be maintained constant at all times. Can always be located near the membrane surface above.

Further, the connection position of the horizontal portion 28A of the L-shaped tube 28 in the water-bloom concentration tank 14 is preferably located below the diffusion tube 20B described above. As a result, it is possible to prevent bubbles forming the microbubble film A from being sucked into the L-shaped tube 28, and since the distance from the microbubble film A becomes large, the microbubble film A does not face obliquely downward but straight downward. It is easy to form a filtered flow of.

Here, the liquid level C of the water-bloom concentrating tank 14 in the present invention is not the upper surface of the water-bloom concentrating layer B, as shown in FIG. Is the liquid level C of the water-bloom concentrating tank 14 when the microbubble film A is stored and the height of the discharge pipe 30 in FIG.
(Means for collecting blue water)

As shown in FIGS. 2 and 3, the water-bloom collecting means 26 has an overflow port 26B in the water-bloom concentrated layer B which is a liquid layer of the water-bloom concentrated liquid containing the water-bloom concentrated on the upper side of the microbubble film A, It is configured as a water-bloom concentrate discharge pipe 26A for discharging the water-bloom concentrate to the outside of the water-bloom concentrate tank 14.

As a result, the water-bloom concentrate concentrated on the upper side of the microbubble film A overflows from the overflow port 26B of the water-bloom concentrate discharge pipe 26A into the water-bloom concentrate discharge pipe 26A, and is discharged to the outside of the water-bloom concentrate tank 14. It The water-bloom concentrate that is discharged from the water-bloom concentrate tank 14 through the water-bloom concentrate discharge pipe 26A is collected in the water-bloom collection container 26C as shown in FIG.

Further, the overflow port 26B of the water-bloom concentrate discharge pipe 26A is arranged at a position lower than the slit port 22C of the overflow pipe 22A. As a result, the overflow pipe 22A does not submerge in the water-bloom concentrated layer B. When the overflow water 22A is submerged in the water-bloom concentrated layer B and overflows the water-bloom raw water from the slit port 22C, the water-bloom concentrated layer B is agitated, so that the microbubble film A is easily disturbed. As a result, the bubbles of the micro bubble film A are easily broken and the filtration performance is deteriorated.
(Another aspect of water-bloom collecting means)

FIG. 4 is a perspective view of another embodiment of the water-bloom collecting means 26 in the water-bloom concentration and recovery apparatus 10, and FIG. 5 is a sectional view taken along the line aa of FIG.

Another embodiment of the water-bloom collecting means 26 is mainly for collecting water-bloom from the water-bloom concentrated liquid concentrated on the upper side of the microbubble film A, and includes a rotating disk 32 having a positively charged surface, and a rake 34. , And a blue discharge member 36.

The rotating disc 32 rotates vertically so that the outer peripheral portion of the rotating disc 32 is always submerged in the blue-green concentrate layer B of the blue-green concentrate concentrated on the upper side of the microbubble film A. Further, the center of the rotary disc 32 is connected to a motor 42 mounted on the mounting base 14</b>A of the water-concentrating tank 14 via a rotary shaft 38 and a speed reducer 40. As a result, the rotating disk 32 slowly rotates (for example, 5 to 10 rpm) while the outer peripheral portion thereof is submerged in the water-bloom concentrated layer B, and the negatively-charged water-bloomed water-bloom of the water-blue concentrated layer B is changed to the positive rotation disk 32. Adsorb. The water-bloom adsorbed on the rotating disk 32 is scraped off by the rake 34. As a result, the water-bloom of the water-bloom concentrate concentrated by the microbubble membrane A can be efficiently and automatically collected.

In this case, the outer peripheral portion of the rotary disk 32 is submerged in the water-bloom concentrated layer B, but is prevented from coming into contact with the microbubble film A. When the rotating disk 32 comes into contact with the microbubble film A, it disturbs the microbubble film A, which is a cause of unstable film formation of the microbubble film A.

By keeping the liquid level C of the water-concentrating tank 14 constant by the filtered liquid flow forming means 24, it is possible to prevent the rotating disk 32 from coming into contact with the microbubble film A. Furthermore, when it is desired to lower the liquid level C position of the water-concentrating tank 14 so that the rotating disc 32 does not come into contact with the microbubble film A reliably, as shown in FIGS. The liquid level C can be forcibly lowered by providing an auxiliary discharge pipe 44 and a discharge valve 46 for discharging the filtrate of the water-bloom concentration tank 14 at a position lower than the C position.

The rake 34 scrapes off the water-bloom adsorbed on the rotary disk 32, and can be provided inside the water-bloom discharging member 36 in contact with both surfaces of the rotary disk 32 as shown in FIGS. 4 and 5, for example. ..

The water-bloom discharging member 36 is formed in a gutter shape extending to the water-bloom collecting container 26C, and has a notch (not shown) at the base end (upper end) in which the rotary disc 32 is loosely inserted. A pair of rakes 34, 34 are provided so as to face each other so as to fill the gap between the inner surface of the base end portion of the water-blowing member 36 and both surfaces of the rotary disc 32. The rake 34 itself is fixed to the water discharge member 36.

As a result, the water-bloom adhering to the rotary disc 32 is scraped off by the rake 34 as the rotary disc 32 rotates, and falls onto the water-bloom discharging member 36. The water-bloom that has dropped onto the water-bloom discharging member 36 slides on the water-bloom discharging member 36 and is collected in the water-bloom collecting container 26C.

Therefore, according to the second embodiment of the water-bloom collecting means 26, the water-bloom of the water-bloom concentrated solution filtered by the micro-bubble membrane A can be collected in a more concentrated state than in the first embodiment.

Any method may be used to positively charge the surface of the rotating disk 32, but a method utilizing contact between the rotating disk 32 and the rake 34 and rubbing against each other can be preferably used. That is, a positively charged substance (eg, acrylic resin, glass, nylon, etc.) in the charging train is used as the material of the rotating disk 32, and a negatively charged substance in the charging train [eg, Teflon (registered trademark), silicone is used as the material of the rake 34. Etc.] should be used.

As a result, the rotating disk 32 and the rake 34 contact each other and rub against each other, so that the rotating disk 32 can be positively charged, so that the scraping of the water-bloom and the positive charging operation of the rotating disk 32 are simultaneously performed. be able to.
(Aoko colony divider)

FIG. 6 is a conceptual diagram in which the water-bloom group dividing machine 48 is incorporated into the entire structure of the water-bloom concentration and recovery apparatus 10 of the present invention.

When a large number of water-blooms are generated in the closed water area 12, the colonies of water-blooms having a three-dimensional structure of several tens to several hundreds μm form a mat and cover the water surface.

In the filtration method for filtering water-bloom using the micro-bubble film A as in the present invention, the density increases due to the increase in the water-blooms gathering like the water-bloom colonies, and the micro-bubbles A pass through and settle down. It will be easier. On the other hand, the small blue-blooms that do not form a colony have a low density and are unlikely to pass through the microbubble film A and are unlikely to sink. Therefore, if the water-bloom colony is taken as it is and filtered through the microbubble membrane A, the filtration efficiency becomes poor.

However, if the gas vesicles of the water-bloom are destroyed when the water-bloom colony is finely divided, the density will increase and the water will pass through the microbubble film A and sink.

Therefore, in the water-bloom concentration and recovery apparatus 10 according to the embodiment of the present invention, before the water-bloom raw water overflow means 22, the water-bloom of the water-bloom colonies in the water-bloom raw water is finely divided so as not to destroy the water cells of the water-bloom group. Equipped with a machine 48. Thereby, the filtration efficiency of the blue-green alga by the microbubble membrane A can be further improved. As a result, the concentration rate of the water-bloom concentrated liquid concentrated on the upper side of the microbubble film A can be improved, and the water-bloom can be collected more efficiently.

The water-bloom group dividing machine 48 is not particularly limited as long as it can be decomposed so as not to destroy the water cells of the water-bloom of the water-bloom group. It is also possible to use a jet flow jet machine that jets a jet flow into the water-bloom group to an extent that does not destroy the water cells of the water-bloom and divides the water-bloom group into smaller parts. Further, by using a spiral pump having a spiral that does not break the bubbles of the water-bloom as the water intake pump 16B, it is possible to perform both the water-blowing raw water water intake function and the water-bloom group dividing function. The water-bloom group divider 48 may be installed in the middle of the water intake pipe 16A as shown in FIG. 6, or may be installed at the position of the water intake of the water intake pipe 16A.
[Concentration recovery method of water-bloom]

Next, a method for concentrating and recovering water-bloom using the water-bloom concentration and recovery apparatus 10 configured as described above will be described. The water-bloom collecting means 26 will be described in the case of another mode shown in FIGS. 4 and 5.

First, water that does not contain water-bloom, such as industrial water or water from which water has been removed from water to remove impurities such as water-bloom, is stored in the water-bloom concentrating tank 14. That is, water is supplied to the water-bloom concentrating tank 14 and stored until the water depth stored in the water-bloom concentrating tank 14 reaches the height of the discharge pipe 30 of the filtrate flow forming means 24. When the depth of water stored in the water-bloom concentration tank 14 exceeds the height of the discharge pipe 30, the water is discharged from the discharge pipe, and thus the liquid level C of the water-bloom concentration tank 14 is set.

Next, the microbubble generating means 18 is operated to discharge the microbubble water from the air diffusing pipe 20B of the microbubble film forming means 20, and the microbubble film A, which is a dense layer in which the bubbles of the microbubbles are dense in the vicinity of the liquid surface C. To form. This completes the preparatory preparation for Aoko concentration and recovery.

Next, the intake port of the intake pipe 16A of the raw water intake means 16 is arranged so as not to move into the surface water of the closed water region 12, and the intake pump 16B is operated. Thereby, the water-blooming raw water containing the water-blooming floating in the surface water of the closed water area 12 is taken into the water-bloom concentrating tank 14. At the same time, the motor 42 of the water-bloom collecting means 26 is driven to slowly rotate the rotating disk 32 via the speed reducer 40.

Then, the water-bloom raw water taken by the water intake pump 16B is caused to overflow to the upper side of the microbubble film A from the slit ports 22C of the two overflow pipes 22A of the water-bloom raw water overflow means 22. As a result, the storage amount of the water-bloom concentrating tank 14 becomes higher than the liquid level C, so that the increased amount of the storage amount is discharged from the water-bloom concentrating tank 14 from the discharge pipe 30 of the filtration flow forming means 24. Therefore, a filtration flow from the upper side to the lower side of the microbubble film A is automatically formed in the water-bloom concentration tank 14. As a result, the raw water of the water-bloom is filtered by the microbubble membrane A.

By this filtration, only the water of the raw water of the water-bloom permeates the microbubble film A and becomes a filtered liquid, and a liquid layer of the water-bloom concentrated liquid in which the water-bloom is concentrated is formed on the upper side of the microbubble film A. That is, by operating the water-bloom concentration and recovery device 10, as shown in FIG. 5, the water-bloom concentrated layer B, which is the liquid layer of the water-bloom concentrated liquid in which the water-bloom is concentrated, is formed on the upper side of the microbubble film A.

The water-bloom in the water-bloom concentrate concentrated on the upper side of the microbubble film A adheres to the rotating disk 32 of the water-bloom collecting means 26. Then, the water-bloom adhering to the rotary disk 32 is scraped off by the rake 34 and collected in the water-bloom collection container 26C via the water-bloom discharge member 36.

According to the water-bloom concentration and recovery device 10 of the embodiment of the present invention, the concentration rate of the recovered water-bloom can be 70% or more.

In the water-bloom concentration and recovery apparatus 10 of the present invention, the bubbles of the microbubbles that compose the microbubble film A are destroyed by time or impact and disappear, so that the microbubble film A can be used as a filtration film. It is necessary to keep the thickness of A and the density of bubbles constant.

In the present invention, not only is microbubble water containing microbubbles continuously fed into the liquid of the water-bloom concentration tank 14, but also an overflow pipe 22A for overflowing the water-bloom raw water near the upper film surface of the microbubble film A. And the discharge amount from the water-bloom concentrate tank 14 is made equal.

As a result, the overflow pipe 22A can be always located in the vicinity of the surface of the microbubble film A, so that the impact of the overflowing water-blowing raw water on the microbubble film is reduced, and the bubbles are less likely to be destroyed, and the microbubbles are not easily destroyed. The film A is less likely to sway, and the denseness of bubbles is easily maintained. As a result, the thickness of the micro-bubble film A and the density of bubbles can be maintained constant. Thereby, the film formation of the micro bubble film A can be stabilized, and the water-bloom raw water can be efficiently filtered.

As described above, in the present invention, since the micro-bubble membrane A is used as the filtration membrane for filtering the water-bloom from the water-bloom raw water, the phenomenon that the water-bloom is clogged unlike the case of using the conventional filtration membrane or the wire net does not occur. .. As a result, the maintenance-free water-bloom concentration and recovery device 10 can be configured.

Further, the water-bloom concentration and recovery apparatus 10 of the embodiment of the present invention needs to use the flocculant as in the flotation separation method in which the water-bloom is flocculated with the flocculant and then floated by the micro bubbles as in the conventional water-bloom recovery. Absent. If a flocculant is used, the density of the flocculate increases, and the microbubble membrane A sinks on the contrary, so that the filtration performance deteriorates. As a result, running costs can be reduced.

As a result, the water-bloom concentration and recovery device 10 according to the embodiment of the present invention can provide the water-bloom concentration and recovery device that can efficiently recover the water-bloom from the water-bloom raw water and that is substantially maintenance-free and can reduce the running cost.

Further, in the water-bloom concentration and recovery apparatus 10 according to the embodiment of the present invention, the following configuration is further incorporated as a device for utilizing the microbubble film A instead of the ordinary filtration filter or the wire net for filtering the water-bloom raw water.

(1) As a water intake pump 16B, a pump that does not destroy water-bloom bubbles is used to prevent the water-bloom density from increasing, and the water-bloom in the water-bloom water that overflows above the micro-bubble membrane A passes through the micro-bubble membrane A. I made it difficult to sink. As a result, the efficiency of filtration of the water-bloom by the microbubble film A can be improved, so that the concentration rate of the water-bloom concentrated on the upper side of the microbubble film can be improved.

(2) Further, the water-bloom group dividing machine 48 divides the water-bloom group into small pieces so as not to break the water-bloom bubbles, so that the density of the water-bloom in the water-bloom raw water overflowing above the microbubble film A becomes small. I chose As a result, the efficiency of filtration of the water-bloom by the microbubble film A can be further improved, so that the concentration rate of the water-bloom concentrated on the upper side of the microbubble film A can be improved.

(3) In addition, since the contaminants were not contained in the water-bloom raw water by the contaminant removal device (not shown), the microbubble membrane A was not impacted by the contaminants. This stabilizes the film formation of the microbubble film A.

(4) Further, as another mode of the water-bloom collecting means 26, since the rotating disk 32 is arranged so as not to contact the microbubble film A, the film formation of the microbubble film A is further stabilized. Further, since the rotating disk 32 is positively charged, the negatively charged water-bloom can be efficiently attached, and the water-bloom recovery efficiency can be improved.

10... Aoko concentration/recovery device, 12... Closed water area, 14... Aoko concentration tank, 14A... Loading platform, 16... Aoko raw water intake means, 16A... Intake piping, 16B... Intake pump, 18... Micro bubble water generating means, 18A ... Air mixing pump, 18B... Decompression nozzle, 18C... Extraction pipe, 20... Micro bubble film forming means, 20A... Liquid delivery pipe, 20B... Diffusion pipe, 20C... Blowing outlet, 22... Aoko raw water overflow means, 22A... Overflow Flow tube, 22B... Dividing tube, 22C... Slit port, 24... Filtration flow forming means, 26... Aoko recovery means, 26A... Aoko concentrated liquid discharge tube, 26B... Overflow port, 28... L-shaped tube, 28A... Horizontal part , 28B... Vertical part, 30... Discharge pipe, 32... Rotating disc, 34... Rake, 36... Aoko discharge member, 38... Rotating shaft, 40... Reducer, 42... Motor, 44... Auxiliary discharge pipe, 46... Discharge Valve, 48... Aoko group divider, A... Micro bubble membrane, B... Aoko concentrated layer, C... Liquid level

Claims (7)

In the water-bloom concentration and recovery device for concentrating and recovering water-bloom from the water-bloom containing water-bloom containing water-bloom,
Aoko concentration tank,
Water-bloom raw water intake means for taking the water-bloom raw water into the water-bloom concentration tank,
Micro-bubble water generation means for generating micro-bubble water containing micro-bubbles having a bubble size of micro-order level,
A microbubble film forming means for forming a microbubble film, which is a bubble-concentrated layer of microbubbles, in the vicinity of the liquid surface of the water-concentration tank by continuously feeding the generated microbubble water into the liquid of the water-concentration tank. ,
Aoko raw water overflow means having an overflow pipe for overflowing the water-bloom raw water above the formed microbubble film,
The overflow amount was discharged from the lower side of the microbubble film to the outside of the blueberry concentration tank by forming a flow from the upper side to the lower side of the microbubble film to form a flow from the upper side to the lower side. A filtration flow forming means for forming a filtration flow for filtering the water-bloom raw water with the microbubble membrane;
A water-bloom concentration and recovery device, comprising: a water-bloom recovery means for recovering the water-bloom concentrated on the upper side of the microbubble membrane by the filtration to the outside of the water-bloom concentration tank. The water-bloom concentration and recovery device according to claim 1, wherein the microbubble water producing means produces microbubble water containing microbubbles having an average bubble diameter of 5 μm or less. The microbubble film forming means,
A liquid supply pipe for supplying the microbubble water generated by the microbubble water generating means into the water-bloom concentration tank,
The water-bloom concentration and recovery device according to claim 1 or 2, further comprising: a diffusion pipe that is disposed below the micro-bubble film and that diffuses the micro-bubble water that has been fed through the liquid feed pipe into the water-bloom concentration tank. .. The filtration flow forming means,
One end is opened below the diffusion pipe, and the other end is opened up to the atmosphere at a position higher than the liquid surface of the water-bloom concentration tank, and is erected upright along the water-bloom concentration tank. An L-shaped pipe that forms a U-shaped communication passage with the same liquid level between
The water-bloom concentration and recovery device according to claim 3, further comprising a discharge pipe connected to the liquid level height of the L-shaped pipe and discharging the liquid from the water-bloom concentration tank. The water-bloom collecting means,
A water-concentrated liquid discharge pipe for discharging the water-dried water concentrate to the outside of the water-cooled concentrate tank, which has an overflow port in the water-dried water concentrate layer which is a liquid layer of the water-dried water concentrate concentrated on the upper side of the microbubble film. The water-bloom concentration and recovery device according to any one of claims 1 to 4. The water-bloom collecting means,
A rotating disc having a positively charged surface while the outer peripheral portion is soaked vertically in a water-concentrated layer, which is a liquid layer of a water-concentrated liquid containing concentrated water-bloom on the upper side of the microbubble film, and which is positively charged,
A rake that scrapes off the water-bloom adsorbed on the rotating disk,
The water-bloom concentration and recovery device according to any one of claims 1 to 4, further comprising: a water-bloom discharge member configured to discharge the water-bloom scraped off by the rake to the outside of the water-bloom concentration tank. 7. The water-bloom group dividing machine for dividing the water-blooming water-blooms in the water-bloom raw water into fine particles so as not to destroy the water cells of the water-bloom, is provided in the preceding stage of the water-bloom raw water overflow means. The water-bloom concentration and recovery device according to item 1.

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