JP6764169B2 - Water environment improvement device - Google Patents

Description

The present invention relates to a water environment improving device, and more specifically, the water environment is improved by suppressing the growth of phytoplankton including blue-green algae forming a colony of blue-green algae and aquatic plants growing in stagnant places such as rivers. Regarding the water environment improvement device to be improved.

In recent years, abnormal overgrowth of aquatic plants such as Egeria densa, Potamogeton crispus, Elodea nuttallii, water lettuce and water hyacinth has become a major social problem in rivers and lakes. In particular, water lettuce and the like have a very strong prosperity and cover the entire water surface in a short period of time.
As a result, sunlight does not reach the water and photosynthesis by underwater plants does not occur, so the oxygen concentration in the water drops significantly, the underwater plants die and the water quality deteriorates, and aquatic organisms such as fish cannot live. It is an environment.

Various techniques and methods have been developed as measures for removing the above-mentioned various aquatic plants including phytoplankton such as blue-green algae.

For example, there is known a water flow generation agitator that inactivates blue-green algae, which is also phytoplankton, by the water pressure of a water flow including a turbulent flow (see, for example, Patent Document 1).
In the water flow generation stirring device disclosed in Patent Document 1, a water pressure of about 0.1 MPa is applied to the pseudo-vacuules contained in the cells of blue-green algae, which is the cause of the blue-green algae phenomenon in which blue-green algae cover the water surface by giving a water depth difference. It is configured to reduce the buoyancy of pseudovesicles, which are small bubbles of air, and make it difficult for blue-green algae to resurface on the water surface.
Further, it is a technique for releasing blue-green algae or the like into low-rise water whose water temperature is about 5 ° C. or higher lower than that of the surface layer by giving a difference in water depth, and hibernating and inactivating phytoplankton such as blue-green algae.

Further, a blue-green algae control method for preventing or reducing the generation of blue-green algae by using a vibration wave is also known (see, for example, Patent Document 2).
In this blue-green algae control method, in the summer, a vibration generator installed in the lake and an oxygen generator are operated together to suppress the elution of nutrients from the lake bottom to prevent or reduce the occurrence of blue-green algae, and in the winter. Discloses a technique for eluting and recovering nutrient salts from the bottom of a lake by operating only a vibration generator.

By the way, many aquatic plants that grow in the stagnation of rivers are a growing environment that is washed away when the flow becomes strong. Therefore, if the flow suddenly changes, the growing environment will change, which will be a great stress for aquatic plants.
It is said that stress is a great enemy not only for plants such as aquatic plants but also for all living things. Conversely, by stressing aquatic plants, it is possible to change the growth status of the aquatic plants, and it is also possible to suppress the growth of the aquatic plants.

When trying to generate a flow in the stagnation of a river, it is conceivable to artificially generate a turbulent flow.
Then, as a device that artificially generates turbulence, the turbulence generator 100 described in Non-Patent Document 1 can be mentioned. The turbulence generator 100 has a configuration as shown in FIG. 16, and in an experiment using the turbulence generator 100, the difference in turbulence intensity is the physiological characteristics of submerged plants and the resulting growth. The purpose was to clarify the effect on the properties and enable effective control by the structure.

The contents of the experiment will be explained.
First, as the plants used in the experiment, five kinds of submerged plants, Chara braunii, Egeria densa, Potamogeton crispus, and Elodea nuttallii, were cultivated for a predetermined period in a tank equipped with a vibration lattice, and the growth rate, chlorophyll concentration, plant hormones, and oxidases were observed. The activity was measured, and the results were compared with the results of the field survey.

As shown in FIG. 16, the turbulent flow generator 100 used a water tank 110 having a size of 15.7 cm × 15.7 cm × 24.5 cm.
In the aquarium 110, soil 111 was laid with a thickness of 4 cm and filled with water to a depth of 3 cm from the upper edge to grow the target plant (aquatic plant) wp.

Regarding the generation of turbulence, the vibration grid 101 was used because of its high isotropic property, and the grid turbulence generated by moving the vibration grid 101 up and down was used.
The vibration grid 101 is composed of grids (grid) at intervals of 2.5 cm.
The driving of the vibration grid 101 is performed by, for example, driving the vibration grid 101 connected to the slider crank 102 that operates in a swiveling manner by the driving device 105 of the slider crank 102.

Next, the result of the experiment using the above-mentioned device and according to the above-mentioned contents will be described based on the above-mentioned Non-Patent Document 1.
According to it, for each of the above aquatic plants wp, the amount of growth clearly decreased as the turbulent flow intensity increased.

The possible causes for this are as follows.
First, the chlorophyll concentration decreased with the turbulent intensity for the species whose growth amount decreased, and it is considered that the photosynthesis amount was suppressed.
The turbulent flow strength of the vibrating grid 101 became weaker as the depth became deeper.

IAA (indoleacetic acid) concentrations decreased with increasing turbulent intensity for species with reduced growth.
The reason for this is that the activities of the oxidases IAAO and POD are increased, and it is considered that the increased turbulent stress increases the oxidase activity and decomposes the IAA. As a result, it is considered that the amount of elongation, which is originally the function of IAA, decreased, and the proportion of leaf stems decreased as compared with the biomass of roots.

Japanese Patent No. 4420452 Japanese Patent No. 5360550 Thesis of the river maintenance fund subsidy project "Understanding the effect of the flow velocity field on the organizing characteristics of submerged plants, flow control using structures, and preparation of guidelines for community regeneration for the purpose of regenerating submerged plant communities; Saitama University Graduate School of Science and Technology Graduate School of Science; Takashi Asaeda; Grant Number: 23-1215-008 "

The water flow generation agitator disclosed in Patent Document 1 attempts to suppress the outbreak of blue-green algae by sucking the blue-green algae on the surface layer and discharging the blue-green algae to a low layer. For example, in a stagnant place in a river. It does not try to suppress the growth of growing aquatic plants.
However, if the discharge jet discharged from the water flow generation mixer used in the water flow generation stirring device can be applied to the aquatic plants, there is a possibility that the aquatic plants can be stressed and their growth can be suppressed.
However, in the above-mentioned water flow generation stirring device, the blue-green algae are sucked from the suction port of the suction hose and discharged into the low-layer water. However, in order to make the water temperature lower than the surface layer by about 5 ° C. or more, the water depth difference is 10 m. Degree is needed. Further, since the discharge jet passes through the inside of the rectifying cylinder, the range of the discharge jet is limited.
On the other hand, the stagnation of rivers where aquatic plants grow is near the shore, so the water depth is not so deep in general rivers.
Therefore, the water flow generation stirring device disclosed in Patent Document 1 cannot be used.

Further, in the blue-green algae control method disclosed in Patent Document 2, the blue-green algae control device includes a raft-shaped base provided with a float, a base portion provided on the raft-shaped base, a plurality of stirring blades, and a stirring cylinder. The configuration is complicated because it is equipped with an oxygen generator, an underwater motor, and the like.
In addition, as described above, in the above-mentioned blue-green algae control method, in the summer, a vibration generator and an oxygen generator installed in the lake are operated in combination to suppress elution of nutrients from the lake bottom and generate blue-green algae. In winter, only the vibration generator is operated to elute and recover nutrients from the bottom of the lake. Therefore, in the blue-green algae control method of Patent Document 2, there is no technical idea of applying turbulent flow to aquatic plants to give stress and thereby suppressing the growth of aquatic plants.

Further, the lattice vibration type turbulence generator 100 used in the above experiment can certainly generate turbulence, but since it is for a laboratory only, the scale is small, and a field such as a stagnant river is used. If you try to install and implement it in, the following problems will occur.

That is, in rivers, ponds and lakes, as a matter of course, maintenance of waterproofing of the drive device and lubrication of bearings, etc., and water measures for power supply when using an electric motor are required, and the device has a complicated configuration. And the cost is high.
Moreover, according to the experimental results, the turbulent flow intensity becomes weaker as the water depth becomes deeper. On the other hand, in the field, unlike the inside of the water tank, the target water area is wide and the water depth is deep, so in order to reach the deep turbulent flow strength, it is necessary to increase the size of the lattice structure, and the lattice element is long. With the change, it becomes necessary to secure the strength.
Further, since the mass and resistance of the enlarged lattice structure increase, it is necessary to increase the strength of the rod and the output of the drive device.

Further, even if the turbulent flow generator 100 is installed on a floating body floating on the water surface or submerged in water, the device becomes large in size. Therefore, in the case of the floating body method, the buoyant body is flooded. It is necessary to consider countermeasures and holding methods that can respond to the effects of river flow, wind, etc.
In the case of the submerged body method, measures against inundation of the submerged body, especially pressure resistance, are problems, so sufficient measures are required.

As described above, the turbulence generator 100 used in the experiment has too many problems and is not suitable for use for blue-green algae and aquatic plants growing in stagnation such as rivers.

[Purpose of Invention]
The present invention has been proposed to solve each of the above problems, and an object of the present invention is to suppress the growth of aquatic plants growing in a stagnant place such as a river with a simple structure. The purpose is to provide a water environment improvement device that can improve the environment.

In order to achieve the above object, the water environment improving device according to the present invention is located in a water system in which phytoplankton such as cyanobacteria exists, and causes stress on the aquatic plants by giving turbulence to the growing water area of the aquatic plants. In a device that suppresses the growth of aquatic plants
The means for giving the turbulent flow includes a self-excited vibrating body that vibrates by itself by ejecting a fluid supplied from the outside to generate a turbulent flow, and a vibrating body holding member that holds the self-excited vibrating body. It is a feature.

According to the water environment improving device of the present invention, the self-excited vibrating body vibrates by itself by ejecting a fluid supplied from the outside to generate turbulent flow. By generating this turbulent flow toward the aquatic plants, it is possible to stress the aquatic plants and suppress the growth of the aquatic plants. As a result, with a simple configuration, the growth of aquatic plants growing in a stagnant place such as a river can be suppressed, and the water environment can be improved.

It is an overall view which shows 1st Embodiment of the water environment improvement apparatus which concerns on this invention. It is an overall perspective view which shows the vibrating body holding member which comprises the water environment improvement apparatus of 1st Embodiment. It is a vertical sectional view along the line III-III in FIG. It is a figure explaining the self-excited vibration state of various self-excited vibrating body which comprises the water environment improvement apparatus of 1st Embodiment, and FIG. 4 (A) is the tube nozzle of this embodiment which comprises self-excited vibrating body, and figure. 4 (B) is a diagram showing a tube nozzle having a fin portion, and FIG. 4 (C) is a diagram showing a self-excited vibration state of a tube nozzle in which a tube nozzle having a fin portion is connected to the tip of the tube nozzle. It is a figure which shows the waveform when the sensor is arranged in the immediate vicinity of the spout without self-excited vibration of the tube nozzle of the 1st Embodiment. It is a figure which shows the waveform of the turbulent flow when the tube nozzle of the 1st Embodiment is self-excited vibration and the sensor is arranged in the immediate vicinity of the ejection port. It is a figure which shows the result of the turbulence setting obtained when the water environment improvement apparatus of 1st Embodiment was submerged in the bottom of a river and used. It is a figure which shows the flow of water for sucking and generating a turbulent flow for collecting blue-green algae by the water environment improvement apparatus of 1st Embodiment. It is a figure which shows the flow of water in the blue-green algae pressurization & release mode which presses and releases a colony of finely pulverized blue-green algae by operating the water environment improvement apparatus of 1st Embodiment, and is collecting and finely pulverized. It is a figure which shows the flow of water in the turbulent flow generation mode which causes the turbulent flow by operating the water environment improvement apparatus of 1st Embodiment. It is a figure which shows the flow of water in the aeration addition turbulence generation mode in which aeration (air mixture) is added to the state of FIG. It is an overall view which shows the 2nd Embodiment of the water environment improvement apparatus which concerns on this invention. A third embodiment of the water environment improving device according to the present invention is shown, FIG. 13 (A) shows a self-excited vibrating body configured by combining two tube nozzles having different lengths, and FIG. 13 (B) shows an intermediate portion. It is a figure which shows the self-excited vibrating body of the structure which increased the exciting part by branching a nozzle. It is a figure which shows the 4th Embodiment of the water environment improvement apparatus which concerns on this invention. It is a figure which shows the timing of water supply in the water environment improvement apparatus of 4th Embodiment. It is an overall view which shows the turbulence generator which experimented to investigate the influence of a turbulence on aquatic plants.

[First Embodiment]
Hereinafter, the first embodiment of the water environment improvement device according to the present invention will be described with reference to FIGS. 1 to 11.

FIG. 1 is an overall view showing the water environment improving device 1 of the first embodiment, and FIG. 2 is a perspective view showing the entire nozzle holding pipe 11 which is a vibrating body holding member constituting the water environment improving device 1.

The water environment improvement device 1 of the first embodiment generates turbulent flow toward the aquatic plants growing in a stagnant place such as a river to stress the aquatic plants, and the aquatic plants are stressed. In the water area where blue-green algae are growing, it is intended to improve the aquatic environment by collecting blue-green algae and finely crushing the colonies of the blue-green algae to make them easily preyed on by zooplankton. is there.

As shown in FIG. 1, the water environment improving device 1 holds a tube nozzle 10 which is a self-excited vibrating body which vibrates by itself to generate a turbulent flow by ejecting a fluid supplied from the outside, and the tube nozzle 10. It is configured to include a nozzle holding pipe 11, the fluid supply means 20 for supplying fluid to the tube nozzle 10, and a blue-green algae crushing / pressurizing means 39 for finely crushing / pressurizing and releasing a group of collected blue-green algae. There is.
Since FIG. 1 only shows the connection state between the constituent members, the flow directions of the first three-way valve 27 and the second three-way valve 37 that switch the flow of the fluid (water) are different. Not shown.

The nozzle holding pipes 11 and 11 are used by being submerged in the riverbed of a stagnant place such as a river. In the embodiment, the two nozzle holding pipes 11 and 11 are arranged substantially in parallel with a gap. Has been done.
Each of these nozzle holding pipes 11 and 11 is attached with the tube nozzle 10 that vibrates by itself to generate turbulent flow by ejecting water, which is a fluid supplied to the inside.

As shown in FIG. 1, a plurality of tube nozzles 10 having a predetermined length (three in each embodiment) are attached to the nozzle holding pipes 11 and 11.
The tube nozzle 10 is made of, for example, silicon rubber, and has an inner diameter of 4 mm and an outer diameter of 6 mm.
Each of the tube nozzles 10 is formed to have the same length of, for example, 30 cm, and the base end portion of each tube nozzle 10 is attached to the nozzle mounting portion 11A previously provided in the nozzle holding pipes 11 and 11. It is detachably attached.

The tube nozzle 10 is not limited to silicone rubber, and can be used as long as it has a plasticity such as a nylon tube or urethane tube that can sufficiently self-excited and vibrate by ejecting water.

Further, the inner diameter dimension and the outer diameter dimension of the tube nozzle 10 are not limited to the above-mentioned dimensions, and for example, those having a diameter of about ± 0.5 mm may be used.
Further, in the present embodiment, the tube nozzle 10 has a length of 30 cm, but the length is not limited to that. For example, 10 cm to 50 cm may be used depending on the place of use, the overgrowth state of aquatic plants, the type of aquatic plants, and the like.
Further, in the present embodiment, three tube nozzles 10 are attached to the nozzle holding pipes 11 and 11, but three or less or three or more may be attached.

As shown in FIG. 2, the nozzle holding pipes 11 and 11 are supported at both ends in the length direction of the nozzle holding pipes 11 and 11, and when the nozzle holding pipes 11 and 11 are submerged in the bottom of the river. A holding member installation means 13 that is grounded to the bottom is provided.
The holding member installing means 13 is formed of, for example, a stainless steel plate having a predetermined width dimension, and as shown in FIG. 3, is continuously drawn downward in a state of being wound around substantially the entire circumference of the nozzle holding pipe 11. A main body portion 13A formed in a divergent shape is formed, and a ground contact portion 13B bent outward is provided at the tip of the main body portion 13A.

On the upper part of the main body 13A, mounting adjustment mechanisms 14 for adjusting the degree of mounting of the main body 13A to the nozzle holding pipe 11 are formed so as to face each other, and these mounting adjustment mechanisms 14 face the main body 13A. It is composed of a bolt 15 spanned between them and a nut 16 screwed onto the bolt 15.
Therefore, by loosening or tightening the nut 16 with respect to the bolt 15, the orientation of the nozzle holding pipe 11 and the orientation of each tube nozzle 10 can be adjusted as shown in FIG. As a result, it is possible to cope with the state of aquatic plants growing in the stagnation of rivers and the like.

Each of the nozzle holding pipes 11 and 11 is formed of, for example, a stainless steel round pipe member having a predetermined diameter and having a predetermined length, and water, which is a fluid, or water and air flow through the inside thereof. There is.
The nozzle holding pipes 11 and 11 do not have to be made of stainless steel, and may be made of synthetic resin such as PP (polypropylene) or vinyl chloride. Further, the nozzle holding pipes 11 and 11 do not necessarily have to be round pipe members, and may be formed of a square pipe or the like. In short, any pipe member having excellent water resistance and rigidity may be used.

As shown in FIG. 2, one end of the nozzle holding pipes 11 and 11 in the length direction is closed by an end plate (not shown), and the other end of the nozzle holding pipes 11 and 11 constitutes the fluid supply means 20. A hose attachment portion 11B for the branch hose 34A of the nozzle-side water supply hose 34 that sends the water sent from the pump 21 into the nozzle holding pipes 11 and 11 is provided.
The nozzle-side water supply hose 34 is connected to a discharge hose 24 provided over the pump 21 and the first three-way valve 27 by switching the first three-way valve 27.

Further, as described above, nozzle mounting portions 11A for mounting the base end portions of the tube nozzles 10 are provided on the outer peripheral portions of the nozzle holding pipes 11 and 11.
Nozzle mounting portions 11A are provided at five locations so that five tube nozzles 10 can be mounted, for example, but in the first embodiment, three nozzle mounting portions 11A are used, and each of them is used. Tube nozzles 10, 10 and 10 are attached to the nozzle attachment portion 11A.
Then, as described above, any number of tube nozzles 10 may be used depending on the type of aquatic plants and the overgrown state, but a blind plug (not shown) may be attached to the unused nozzle mounting portion 11A. ..

As shown in FIG. 1, as described above, the water environment improving device 1 includes a fluid supply means 20 for supplying water as a fluid to each of the plurality of tube nozzles 10.
That is, the fluid supply means 20 includes a pump 21 that sends water to the nozzle holding pipes 11 and 11 via a discharge hose 24, a first three-way valve 27, and a nozzle-side water supply hose 34, and a motor 22 that drives the pump 21. A generator 23 and a suction hose 25 for sucking water from a river or the like by driving a pump 21 are provided.

The tip of the suction hose 25 is, for example, inserted into a river, and the base end of the hose is connected to the pump 21.
The suction port of the suction hose 25 is equipped with a relatively coarse filter 26 so as not to suck dust or the like.
Further, in the discharge hose 24, a relief valve 29 and a pressure gauge 30 are provided in the middle of connecting the pump 21 and the first three-way valve 27.
This relief valve 29 is also called a safety valve, and has a role of monitoring the maximum pressure of the entire device and protecting the device, and the released fluid is released to the atmosphere or water.
Further, a pipe 33 for supplying aeration air (air) equipped with an air valve 31 and a check valve 32 is arranged between the pump 21, the relief valve 29, and the pressure gauge 30.

As described above, the discharge hose 24 is provided between the pump 21 and the first three-way valve 27, and is connected to the nozzle-side water supply hose 34 by switching the first three-way valve 27. There is.
The tip side of the flow of the nozzle-side water supply hose 34 is connected to the two branch hoses 34A and 34A by a branch pipe 35 such as cheese.
Then, these branch hoses 34A and 34A are connected to the hose attachment portion 11B of the nozzle holding pipes 11 and 11.

Next, the self-excited vibration of the tube nozzle 10 will be described with reference to FIG.
FIG. 4A shows the self-excited vibration state of the tube nozzle 10 of the present embodiment, and FIG. 4B shows the self-excited vibration state of the tube nozzle 10A having a fin portion. FIG. In (C), the self-excited vibration state of the composite tube nozzle 10B configured by joining the tube nozzle 10A to the tip of the tube nozzle 10 is shown.
Here, although the tube nozzle 10 of FIG. 4 (A) is used in this embodiment, the tube nozzle 10A of FIG. 4 (B) and the tube nozzle 10B of FIG. 4 (C) can also be used.
The jet flow J ejected from the tips of the tube nozzles 10, 10A, and 10B and the turbulent flow T are vibration elements.

Each flow will be described in more detail.
The jet J is originally a high-speed flow of a fluid (water), and when jetted into still water, a strong shearing force acts at the interface, and the jet J travels in the laminar flow L direction while generating an intermittent flow.
Even if the direction of the jet J changes due to the self-excited vibration of the tube nozzle 10 or the like, it has the same function as the vibration of the vibrating element for still water.

Here, since a jet flows intermittently in the laminar flow L part, it becomes a turbulent flow by the definition of the flow, and if the jet flow is a little further downstream where the jet flow cannot be observed, the jet flow and the flow generated by being drawn into the jet flow are sufficiently agitated. It becomes the flow that was done. Then, in FIG. 4, the region where the jet is represented by the dotted line is a turbulent region.
Strictly speaking, the turbulent flow T is the lattice turbulent flow T generated by the tube nozzle 10 on the same principle as the turbulent flow due to the lattice vibration, the jet flow J is the turbulent flow J of the jet flow, and the laminar flow L is the intermittent flow of the jet flow. It can be expressed as the turbulent flow L of.

Depending on the conditions, the tube nozzle 10 or the like performs complex vibration by self-excited vibration at several Hz to several tens of Hz, which is a combination of fan-shaped, circular, and figure-eight movements, and generates turbulent flow T.
That is, the tube nozzle 10 or the like induces a bending motion by self-excited vibration by the reaction force generated when water or air is ejected from the tube nozzle 10 or the like, and this bending motion is called a forward wave motion. Since it is almost the same movement as the caudal fin of a fish, it produces propulsive force or stirring force.

In the case of aquatic plants, the technical element is a mechanism that stresses plants and inhibits their growth by turbulent flow of new knowledge, so the range of turbulent flow must be included in the technical elements of the design and construction of this device. is there.
Since lattice turbulence is a kind of wave propagation, the propagation range is not as wide as jets and convections, but in the present invention, lattice turbulence and turbulence caused by jets are generated together, so the range of influence is wide.

Since the nozzle holding pipes 11 and 11 are always responsible for the reaction of the vibrational motion of the tube nozzle 10, it is necessary to regulate the elasticity and the range of motion of the support portion, whereby the tube nozzle 10 is as expected. It will vibrate.

Here, based on FIGS. 5 and 6, the piezo type acceleration sensor is arranged at a position where the water flow blown from the tube nozzle 10 is directly received, and the water flow is not blown out when the water flow is actually blown out. The waveform with the case will be described. In addition, this experiment was carried out by filling a container such as a water tank with water.

First, the waveform when the water flow is not blown out from the tube nozzle 10 is as shown in FIG. 5, and no change is observed. As a result, it has no effect on aquatic plants.
Next, the waveform when the water flow was actually blown out from the tube nozzle 10 was as shown in FIG. 6, and the amplitude range was large. As a result, it can be inferred that a strong impact is given to aquatic plants.

When the tube nozzles 10, 10A, and 10B of FIGS. 4 (A) to 4 (C) are used as the water environment improving device 1, the vibration grid 101 of the turbulent flow generator 100 used for the experiment as described above. On the other hand, the following advantages can be mentioned.
That is, when each tube nozzle 10, 10A, 10B is regarded as a vibration source, each tube nozzle 10, 10A, 10B can be said to be a vibration device, but the principle of this vibration device belongs to the fluid mechanism, and the pressure fluid It becomes a power source.

The pressure fluid may be water, air, etc., and a mixed two-layer fluid thereof may be used, and the pressure fluid source may be tap water, pump-up water such as a river, water in a high-altitude tank, etc. In the case of air, compressed air at that location, air such as a bomb, etc. can be used, and by using something that does not interfere with the target water system, the fluid after use can be recovered. You don't have to.
Therefore, since there is no device that uses lubrication or the like in water, contamination by lubricating oil or the like does not occur even in the case of failure or destruction of the device.

Furthermore, even if the energy source of the device that produces the pressure fluid is electricity, this device can be installed on the ground (land) and the pressure fluid can be supplied by a hose, so there is no power electrical equipment in the water and a flood should occur. It is possible to install it in a high place where the power and electrical equipment such as a motor is not submerged even if it occurs, and there is an advantage that the electrical safety is high.

As described above, the water environment improving device 1 collects, stores, and crushes the blue-green algae in the water area where the phytoplankton such as the blue-green algae grows. It has.

That is, as shown in FIGS. 1, 8 and the like, the colony crushing / pressurizing means 39 of blue-green algae abruptly changes the flow velocity of the fluid (water) containing blue-green algae, resulting in a shocking pressure change and a large shearing force. It is configured to include a colony crushing mechanism 41 of blue-green algae that finely crushes a colony of blue-green algae, and a pressure vessel 40 that is a blue-green algae pressurizing mechanism that accommodates and pressurizes the colony of blue-green algae. ..

The inside of the pressure container 40 is a closed space, and in the pressure container 40, a filter 49 for filtering and collecting blue-green algae a is arranged at one end in the length direction. A relatively fine filter 49 is used.
A pressure container hose 44 connected to the pump 21 is provided at one end of the pressure container 40. A second three-way valve 37 is arranged on the pump 21 side of the pressurized container hose 44, and a filter 28 is arranged between the second three-way valve 37 and the pump 21.

The end of the discharge hose 24 opposite to the pump 21 is connected to the first three-way valve 27 as described above.
By appropriately switching the first three-way valve 27 to the first three-way valve 27, the nozzle-side water supply hose 34 that can send the water from the discharge hose 24 to the nozzle holding pipes 11 and 11 or the addition A container-side hose 45 that can be fed to the pressure vessel 40 is connected via a pressure vessel hose 44.
The container-side water supply hose 45 is provided with a check valve 46 for passing water from the discharge hose 24.
As the first three-way valve 27 and the second three-way valve 37, so-called L-shaped ones are used.

The pressure vessel 40 is provided with a blue-green algae collecting pipe 42 for collecting blue-green algae, and the blue-green algae collecting pipe 42 is a check valve for passing water containing blue-green algae from the blue-green algae growing position. 43 is provided, and this check valve 43 constitutes the colony crushing mechanism 41 of the blue-green algae.
Further, at the other end of the pressurized container 40 in the length direction, a pressurized water discharge pipe 47 for discharging the finely pulverized blue-green algae a inside the pressurized container 40 together with the pressurized water to the nozzle holding pipes 11 and 11 is provided. ing. The pressurized water discharge pipe 47 is provided with a relief valve 48 for passing water containing blue-green algae from the inside of the pressurized container 40, and the relief valve 48, together with the check valve 43, provides a colony crushing mechanism 41 for blue-green algae. It is configured.

Here, the water collected by the blue-green algae collecting pipe 42 and the blue-green algae a collide with each other inside the valve due to an increase in the flow velocity due to the throttle portion of the check valve 43, and the speed drops suddenly in the pressure vessel 40. A sudden change in pressure occurs at the site, which causes the colony of blue-green algae to be crushed.
Further, when the blue-green algae a pass through the check valve 43, a large shearing force is generated because they collide with the throttle portion of the internal structure of the check valve 43, and the colony of the blue-green algae a is also finely pulverized.

Further, since the relief valve 48 is also provided in the pressurized water discharge pipe 47 provided in the pressurized container 40, the shearing described above is also performed when the pressurized water is discharged from the pressurized container 40 to the nozzle holding pipes 11 and 11. The colony of blue-green algae is crushed by force.
Then, here, the check valve 43 and the relief valve 48 form a colony crushing mechanism 41 for blue-green algae as described above.
Here, the relief valve 48 determines the pressing force of the pressure vessel 40, and the fluid that has passed through the relief valve 48 flows to the pressurized water discharge pipe 47, and has a structure that does not allow the fluid after release to escape. It has become.
Therefore, the set pressure of the relief valve 48 is set to a smaller set value than the set pressure of the relief valve 29. That is, the set pressure is relief valve 29> relief valve 48, and the set pressure of the relief valve 29 acts as a safety valve that determines the maximum pressure of the device.

Next, based on FIGS. 8 to 11, the action of collecting and pressurizing blue-green algae by the water environment improving device 1 and generating a turbulent flow toward the aquatic plant wp will be described.

First, the flow of water in the blue-green algae suction mode will be described with reference to FIG.
In FIG. 8, the portions indicated by the thick lines inside the first three-way valve 27 and the second three-way valve 37 are in a state of being switched to the water flow direction in advance, and A and A shown by the thick black lines are shown. The flow along ′ is the direction of the flow of water sucked up from the pressure vessel 40.
The arrows B and B'indicated by the dotted lines indicate a state in which water is not flowing.

To collect the blue-green algae a, the pump 21 is operated, and first, the water in the water area together with the blue-green algae a is sucked into the pressurized container 40 from the blue-green algae collecting pipe 42 arranged in the growing water area of the blue-green algae a, and the water is added. It is sucked to the pump 21 side through the filter 49 in the pressure vessel 40.
When the blue-green algae a is sucked into the pressure vessel 40 together with water, as described above, a sudden pressure change when passing through the check valve 43 and when being sucked into the pressure vessel 40, and the check valve 43. The colony of blue-green algae is crushed by a large shearing force generated by colliding with the squeezed portion of the internal structure of.

By the operation of the pump 21, the blue-green algae a is sucked together with the water in the pressurized container 40.
However, since the pressurizing container 40 is provided with the fine filter 49, as described above, the colony of the blue-green algae that has been finely pulverized when passing through the check valve 43 is supplemented by the filter 49 and pressurized. Water is sucked into the container hose 44, and the colony of blue-green algae floats in the pressurized container 40 in a finely pulverized state.

The water sucked from the pressure vessel 40 and the finely pulverized blue-green algae reach the pump 21 via the second three-way valve 37, and are discharged from the pump 21 to the discharge hose 24, and at the same time, the first It flows to the nozzle side hose 34 extending along the direction of the arrow A'of the thick line via the three-way valve 27 of the above.

The water flowing in the nozzle-side hose 34 is introduced from the branch hose 34A at the tip of the nozzle-side hose 34 into the nozzle holding pipes 11 and 11 installed on the bottom of the water, and is also installed in the nozzle holding pipes 11 and 11. It is ejected from each of the tube nozzles 10 and causes each tube nozzle 10 to self-excited and vibrate.
Then, the turbulent flow generated by the self-excited vibration of the tube nozzle 10 collides with the aquatic plant wp, thereby giving stress to the aquatic plant wp.

The above action is continued until the amount of the blue-green algae a in which the colony is finely pulverized and exists in the floating state in the pressure vessel 40 and the blue-green algae a captured by the filter 49 reach a certain amount. And this action corresponds to the turbulence generation mode described later.

A certain amount of the floating blue-green algae a and the blue-green algae a supplemented by the filter 49 are contained in the pressurized container 40, for example, an amount of water that is poorly sucked from the pressurized container 40 by the pump 21. When accumulated, as shown in FIG. 9, the mode shifts to the blue-green algae pressurization mode, pressurized water is sent into the pressurized container 40, and the blue-green algae floating in the pressurized container 40 are brought together with water in the pressurized container 40. It is designed to discharge to the outside, that is, to the nozzle holding pipes 11 and 11.
That is, first, the second three-way valve 37 is switched so that water communicates with the suction side of the pump 21 and the suction hose 25, and the water from the discharge side of the pump 21 sends water to the container side through the first three-way valve 27. Switch so that it flows to the hose 45 side so that it flows to the pressurized container 40 side.

By driving the pump 21, water is sucked up from the suction hose 25 to the pump 21 via the second three-way valve 37, and is discharged from the pump 21 to the discharge hose 24.
The water of the discharge hose 24 is sent to the container-side water supply hose 45 via the first three-way valve 27, and flows into the pressure vessel 40 from the container-side water supply hose 45 via the pressure container hose 44. To do.

Then, the pressurized water is sent from the pressurized container 40 to the nozzle holding pipes 11 and 11 via the pressurized water discharge pipe 47 together with the blue-green algae in which the colony is pulverized, and the tube nozzles attached to the respective nozzle holding pipes 11 and 11. The 10 is self-excited and vibrated.
The pressurized water discharge pipe 47 is provided with the relief valve 48, and when the blue-green algae a whose colony was previously crushed passes through the relief valve 48, it is further pulverized due to a sudden pressure change or the like as described above. It is discharged from the pressurized water discharge pipe 47 in this state.

The turbulent flow generated by the self-excited vibration of these tube nozzles 10 collides with the aquatic plants wp, and stresses the aquatic plants wp growing in the stagnant place.

Here, the fact that the colony of blue-green algae is finely crushed when the blue-green algae are pressed and collided is that the "rapid blue-green algae" announced at the "58th Annual Scientific Lecture Meeting of the Japan Society of Civil Engineers (September 2003)". It is proved by the paper "Development of processing equipment".
That is, to explain roughly, it is said that cyanobacteria having gas vesicles lose their buoyancy when pressurized to 0.3 MPa or more. Blue-green algae that have lost buoyancy settle and become unable to perform photosynthesis and eventually die. In addition, it is said that the blue-green algae that formed the colony structure are easily preyed on by zooplankton because they are divided into small pieces by collision.
And the blue-green algae processing device was developed to prove them.

In the place where only aquatic plants wp grow, as shown in FIG. 10, the turbulent flow generation mode is performed.
That is, first, the second three-way valve 37 is switched so that the water from the suction hose 25 flows to the suction side of the pump 21, and the water from the discharge side of the pump 21 is discharged from the first three-way valve 27. 24. Switch so that the water flows to the nozzle holding pipes 11 and 11 via the nozzle-side water supply hose 34.

By driving the pump 21, water is sucked up from the suction hose 25 to the pump 21 via the second three-way valve 37 and discharged. The water discharged from the pump 21 flows from the discharge hose 24 to the nozzle holding pipes 11 and 11 via the first three-way valve 27 and the nozzle-side water supply hose 34.

Then, the water sent to the nozzle holding pipes 11 and 11 is ejected from the tips of the tube nozzles 10 attached to the nozzle holding pipes 11 and 11, whereby each tube nozzle 10 is self-excited and vibrated.
The turbulent flow generated by the self-excited vibration of these tube nozzles 10 collides with the aquatic plants wp, and stresses the aquatic plants wp.

When water is ejected from the tube nozzle 10 to generate turbulent flow toward the aquatic plants wp, air can be ejected at the same time.
In this case, the flow is as shown in FIG. That is, in the turbulent flow mode shown in FIG. 10, the air valve 31 arranged between the pump 21 and the first three-way valve 27 is opened, and air is sent to the discharge hose 24 via the air introduction pipe 33.

Then, the water mixed with air is sent from the discharge hose 24 to the nozzle holding pipes 11 and 11 via the first three-way valve 27 and the nozzle side water supply hose 34, and is ejected from the tip of the tube nozzle 10 attached to each of them. As a result, each tube nozzle 10 is self-excited and vibrated.
Then, the turbulent flow mixed with the bubbles b generated by the self-excited vibration of these tube nozzles 10 collides with the aquatic plants wp, and stresses the aquatic plants wp.
Further, the air-mixed water is a bent portion generated by the self-excited vibration of the nozzle 10 because fluids having greatly different densities, such as water, air, and minute air bubble water, pass through the nozzle 10 as irregular lumps. Since the centrifugal force when passing through the water changes irregularly, the amplitude of the self-excited vibration becomes large and irregular.
Then, the reaction force when ejected from the nozzle 10 changes irregularly, and the vibration of the nozzle 10 is irregularized and expanded. As a result, the generated turbulence also increases. Furthermore, the ejected air has an aeration effect.
In addition, when the water from the pressurizing container 40 is sent to the nozzle holding pipes 11 and 11 side in the blue-green algae suction mode described in FIG. 8 described above, as described above, the water mixed with air is sent and the bubbles b are mixed. Turbulence can collide with aquatic plants ww.

When water such as a river is directly taken in by the suction hose 25 in a water area where blue-green algae do not grow, a sufficient amount of water cannot be taken in because fine mud, torn leaves, etc. may be sucked into the filter 26. Also occurs.
In such a case, the pressurizing container 40 can be used as a filter substitute on a regular basis.

In this case, the water flow state in the blue-green algae collection mode as described above may be used.
That is, first, the second three-way valve 37 is switched so that the water from the pressurized container hose 44 can be sucked up by the pump 21, and the water discharged from the pump 21 is discharged from the discharge pipe 24 and the nozzle side hose. The first three-way valve 27 may be switched so as to flow to the nozzle holding pipes 11 and 11 via the 34, and the pump 21 may be driven.

FIG. 7 shows the results of submerging the nozzle support pipe 11, the pressure vessel 40, etc. of the water environment improving device 1 in the river, operating the pump 21, etc., and applying the turbulent flow from the tube nozzle 10 to the aquatic plants wp. ing.
From the measurement results shown in FIG. 7, it was possible to confirm the effect of turbulence on the aquatic plants ww. In this experiment, one tube nozzle 10 is used to generate turbulence.
Here, as shown in FIG. 2, five tube nozzles 10 can be used for the nozzle support pipe 11, but in the experiment, one of the tube nozzles 10 is used to generate turbulence. Nozzle.

In order to obtain the measurement result of FIG. 7, the water environment improvement device 1 was submerged in a river and a field experiment was conducted.
The field experiment was conducted under the following conditions.
Date and time: Saturday, September 17, 2016
Location: 1km before the confluence of Gonokawa River, downstream of Haji Dam, Miyoshi City, Hiroshima Prefecture Target aquatic plants: Aquatic plants (Egeria densa)
Installation device: Manifold (holding pipe) connection tube Nozzle (length 500 mm) 1 installation position: Riverbed (water depth about 500 mm)
Erupted fluid: River water (local intake)

In order to obtain a more effective effect on the aquatic plants ww due to the occurrence of turbulence in accordance with the growing environment of the aquatic plants ww, it is an essential condition to increase the turbulent flow intensity.
For that purpose, it is conceivable to increase the size of the device, increase the number of tube nozzles 10, examine the arrangement of the tube nozzles 10, examine the structure of the tube nozzle 10, examine the ejected fluid (water / air), and the like.
In the first embodiment, the number and length of the tube nozzles 10 and the type of fluid are set based on the above experimental results.

(Effect of the first embodiment)
According to the water environment improving device 1 of the first embodiment having the above configuration, the following effects can be obtained.

(1) Since the tube nozzle 10 self-excited and vibrates by ejecting the water discharged from the pump 21 constituting the fluid supply means 20, the tube nozzle 10 is used as a growing water area for aquatic plants wp containing phytoplankton such as blue-green algae. By directing the spout of the tube nozzle 10 toward the aquatic plant wp to generate a turbulent flow, it is possible to particularly stress the aquatic plant wp and suppress the growth of the aquatic plant wp. As a result, with a simple structure, it is possible to suppress the growth of blue-green algae growing in stagnant places such as rivers and especially the aquatic plants ww, and it is possible to improve the water environment.

(2) Stress is applied to the aquatic plants wp because the turbulent flow generated by the water ejected from the tip of the tube nozzle 10 or the water mixed with air collides with the aquatic plants wp growing in the stagnant part of the river or the lake. Can be given. As a result, the growth of aquatic plants ww can be suppressed, the overgrowth of aquatic plants ww can be prevented, and the water environment can be improved.

(3) Since the tube nozzle 10 is made of silicon rubber having a total length of 30 cm, an inner diameter of 4 mm, and an outer diameter of 6 mm, self-excited vibration occurs even with water or air sent from the pump 21 via the discharge hose 24. It becomes possible, a larger turbulent flow can be generated, and a larger stress can be given to the aquatic plant wp.

(4) Since a tube nozzle 10 having a total length of 30 cm is used for each of the two nozzle holding pipes 11 and 11, when the tube nozzle 10 is self-excited and vibrated by the injection of water, the tube nozzle 10 and the aquatic plant wp When the tube nozzle 10 and the aquatic plant wp are in direct contact with each other, a stronger stress than turbulent flow can be applied.

(5) Three tube nozzles 10 having a total length of 30 cm are provided at predetermined intervals, and the range of self-excited vibration is widened, so that it is possible to deal with aquatic plants wp in a wide range.

(6) The nozzle holding pipes 11 and 11 are supported by support legs 13 on both ends in the length direction, and two main body portions 13A and two ground contact portions 13B are formed on each of these support legs 13. Therefore, it can be stably placed at the bottom of rivers and the like.

(7) The tube nozzles 10 can be freely replaced in the nozzle holding pipes 11 and 11, and the number of tube nozzles 10 attached can be increased according to the growing condition of blue-green algae and aquatic plants wp. As a result, it can be used in any habitat such as aquatic plants wp, and therefore has high utility value.

(8) In a river or the like where both blue-green algae and aquatic plants ww are growing, by using the water environment improving device 1, the collected blue-green algae a is crushed and pressurized by the blue-green algae a. After the colony of the above is finely pulverized, it can be supplied to the nozzle holding pipes 11 and 11 together with the pressurized water, whereby the turbulent flow can be applied to the aquatic plants wp from the tube nozzle 10. As a result, strong stress is given to the aquatic plant ww, so that the growth can be suppressed. In addition, blue-green algae are preyed on by reducing the size of the colony to a size that makes it easy to feed on zooplankton. In this way, the water environment can be improved by suppressing the growth of both blue-green algae and aquatic plants wp.

(9) In a water area where blue-green algae do not grow, the pressure vessel 40 can be used as a filter substitute by appropriately switching the first and second three-way valves 27 and 37, so that it is useful. Is high.

[Second Embodiment]
Next, a second embodiment of the water environment improving device according to the present invention will be described with reference to FIG.
The water environment improving device 2 of the present embodiment includes a fluid supply means 50 including a tube pump 51, an in-line mixer 57, and a pressure tube 54.
In FIG. 12 showing the water environment improving device 2 of the second embodiment, the same members as the water environment improving device 1 of the first embodiment are designated by the same reference numerals, and only different parts will be described.

In the water environment improving device 2 of the second embodiment, the fluid supply means 50 is connected to a suction hose 55 that sucks water from a river or the like together with blue-green algae, a tube pump 51 that sucks water from the suction hose 55, and the tube pump 51. The known in-line mixer 57, a pressure tube 54 for connecting the in-line mixer 57 and the nozzle holding pipes 11 and 11, an electric motor 52 for driving the tube pump 51, and a generator 53 are provided. ing.

An in-line mixer 57 is connected to the tube pump 51, and the water discharged from the tube pump 51 and the blue-green algae a are agitated when passing through the inside of the in-line mixer 57, so that a colony of blue-green algae a is formed. It is designed to be finely crushed.
Then, the blue-green algae pulverized by the in-line mixer 57 is sent to the pressure tube 54 together with the water.

The tip of the pressure tube 54 is connected to the branch hoses 54A and 54A by the branch pipe 56, and these branch hoses 54A and 54A are connected to the nozzle holding pipes 11 and 11, and these nozzle holding pipes 11 and 11 are also connected. Is equipped with each of the three tube nozzles 10.

The tip of the suction hose 55 is inserted into a blue-green algae growth area such as a river or a swamp, and a hose having an inner diameter of 50 to 60 mm is used so that the blue-green algae can suck up water together with the tube pump 51. ing.
The inner diameter of the hose is not limited to the above size of 50 to 60 mm.

The tube pump 51 constituting the fluid supply means 50 extrudes the fluid or the like in the rotation direction of the rotor, and at the same time, the transferred substance, that is, the fluid or the like is sucked by the vacuum pressure generated when the crushed tube is restored. It is composed.

Further, the electric motor 52 controls the rotation of the tube pump 51 so that the flow rate and pressure can be adjusted. Then, when the water is sucked up together with the blue-green algae and sent to the pressure tube 54, the water can be sent at a pressure of, for example, about 0.5 Mpa.
Therefore, the blue-green algae sucked up by the tube pump 51 is finely pulverized by the in-line mixer 57, and the finely crushed blue-green algae a is sent to the nozzle holding pipes 11 and 11 together with the pressurized water, and the tube nozzle 10 of the nozzle holding pipes 11 and 11 is sent. The turbulent flow can be made to collide with the aquatic plant wp.

As described above, the water environment improving device 2 of the second embodiment is applied to the water area where the blue-green algae a and the aquatic plant wp are growing, but it is arranged in the water area where only the aquatic plant wp is growing. It is natural that it is also good.
In this case, the suction hose 55 is inserted into the water area where only the aquatic plants wp are growing, water is sucked up from there by the pressure tube 54, the water is discharged from the in-line mixer 57 to the pressure tube 54, and the branch hoses 54A and 54A It may be sent to the nozzle holding pipes 11 and 11.
Further, the air valve 31 may be adjusted to send aeration air to the pressure tube 54 to eject water mixed with air. Further, as described above, when the water environment improving device 2 is applied to the water area where the blue-green algae a is growing, the water mixed with air may be ejected.

According to the water environment improving device 2 of the second embodiment having the above configuration, in addition to the effects substantially the same as the effects of (1), (2), (4), (6), and (7) described above. , The following effects can be obtained.
(11) Since the fluid supply means 50 of the water environment improving device 2 includes a tube pump 51, an in-line mixer 57, and a pressure tube 54, the blue-green algae a is sucked by the suction hose 55 and is sent from the tube pump 51. The discharged colony of blue-green algae can be finely pulverized with an in-line mixer 57 to facilitate predation by zooplankton. As a result, the growth of both blue-green algae and aquatic plants wp can be suppressed, and the water environment can be improved.

(12) The fluid supply means 50 of the water environment improving device 2 is configured to include a tube pump 51 and a pressure tube 54, and by operating these, the growth of both blue-green algae and aquatic plants wp can be suppressed. Therefore, the first and second three-way valves 27 and 37 and the pressure vessel 40 used in the water environment improving device 1 of the first embodiment become unnecessary. As a result, the device can be simplified.

[Third Embodiment]
Next, a third embodiment of the water environment improving device according to the present invention will be described with reference to FIG.
In the water environment improving devices 1 and 2 of the first and second embodiments, three tube nozzles 10 as self-excited vibrating bodies are attached to the nozzle holding pipes 11 and 11, and each of them has the same length. Although configured, the water environment improving device 3 of the third embodiment is configured by attaching different types of nozzles to the nozzle holding pipes 11 and 11.

That is, as one type, as shown in FIG. 13A, a combination of two tube nozzles 60A and 60B having different lengths is bundled in the middle of each length direction, for example, one place. The combination nozzle 60 may be tied with a member 61 to form one combination nozzle 60, and the combination nozzle 60 may be attached to the nozzle attachment ports 11A of the nozzle holding pipes 11 and 11.
When two tube nozzles 60A and 60B are combined, as described above, the intermediate positions in the respective length directions are bound by a predetermined binding member 61 so that they do not get entangled with each other during self-excited vibration. It has become.

Alternatively, as shown in FIG. 13B, for example, three branch nozzles 65A, 65B, 65C may be provided in the middle of the tube nozzle 65 to increase the excitation portion.
Then, the tube nozzle 65 may be attached to the nozzle attachment ports 11A of the nozzle holding pipes 11 and 11.

In the third embodiment, for example, two combination nozzles 60 shown in FIG. 13 (A) and one tube nozzle 65 shown in FIG. 13 (B) are attached to the nozzle holding pipes 11 and 11, for a total of three. Has been done.

In the above configuration, the combination nozzle 60 and the tube nozzle 65 may be the tube nozzle 10B having the shape shown in FIG. 4C.
Further, the shape may be such that fin portions (not shown) are provided along the entire length of the combination nozzle 60 and the tube nozzle 65, or at a plurality of positions in the middle in the length direction.

According to the water environment improving device 3 of the third embodiment having the above configuration, in addition to the effects substantially the same as the effects of the above (1) to (7), the following effects can be obtained.
(13) Two or three combination nozzles 60 and tube nozzles 65 are attached to each of the nozzle holding pipes 11 and 11, and the individual combination nozzles 60 and tube nozzles 65 themselves are unpredictable, respectively. Due to the complex movement of, the range of turbulence is expanded, and as a result, a wider range of aquatic plants wp can be accommodated.

[Fourth Embodiment]
Next, a fourth embodiment of the water environment improving device according to the present invention will be described with reference to FIGS. 14 and 15.
The water environment improving device 4 of the fourth embodiment was developed in order to correspond to the aquatic plants wp that grows over a wide range, and the A-row nozzle group 77 and the B-row nozzle group 78 are arranged so as to face each other. , And two rows of the A row nozzle group 77'and the B row nozzle group 78' facing each other are arranged side by side.

Then, the two rows of the A-row nozzle group 77 and the B-row nozzle group 78, and the A-row nozzle group 77'and the B-row nozzle group 78' are arranged so as to face each other with a region of the target aquatic plant wp in between. By alternately operating the A-row nozzle group 77 and the B-row nozzle group 78, and the A-row nozzle group 77'and the B-row nozzle group 78', the aquatic plants wp between the nozzle groups 77 and 78, etc. It is configured to shake and give stress.

As shown in FIG. 14, in the water environment improving device 4, the tube nozzles 10 of the A-row nozzle group 77 and the B-row nozzle group 78 face each other, and the A-row nozzle group 77'and the B-row nozzle group 78' The tube nozzles 10 are arranged so as to face each other.
Here, in FIG. 14, the row A nozzle groups 77, 77'and the row B nozzle groups 78, 78' are arranged on the same plane, but the mounting positions of the nozzle mounting portions 71A, 72A are, for example, up and down. You can change the direction by changing to.

Row A nozzle groups 77 and 77'composed of a pipe member 71 and a plurality of tube nozzles 10, and row B nozzle groups 78 and 78'composed of a pipe member 72 and a plurality of tube nozzles 10.
A plurality of the tube nozzles 10 for ejecting water, which is a fluid, and generating turbulence are attached to these pipe members 71 and 72.
Each of these tube nozzles 10 is attached to the nozzle mounting portions 71A and 72A of the pipe members 71 and 72 in a state where the fluid outlets of the tube nozzles 10 face each other.

As shown in FIG. 14, one end of each nozzle holding pipe 71, 72 is connected to the electromagnetic switching valve 73, and the electromagnetic switching valve 73 is connected to the pump 74.
Further, the electromagnetic switching valve 73 is connected to the tube nozzles 10 of the nozzle holding pipes 71 and 72, that is, the controller 76 that controls switching of the timing of water supply to the A row nozzle group 77 and the B row nozzle group 78. ing.

Here, considering the waterweed nozzle and its arrangement, each tube nozzle 10 operates individually to perform self-excited vibration, so that there may be a place where the turbulent vibration interferes and attenuates when propagating. Therefore, the turbulent flow is effective only in the immediate vicinity of the jet flow of the nozzle and the vibration of the tube nozzle 10, and if the arrangement of the nozzles is separated so that the turbulent flows generated by the nozzles do not interfere with each other, the attenuation due to the interference Becomes minor.
However, when trying to generate a strong turbulent flow in the target water area, it is desired that the nozzles have a high arrangement density, so they are arranged at intervals that are unlikely to cause interference. Then, this interval is set to, for example, 30 cm in the embodiment.

In that state, as shown in the water flow timing of FIG. 15, first, for example, water for vibration is pumped to each tube nozzle 10 of the A row nozzle group 77, 77 ′ via the nozzle holding pipes 71 and 72. It is sent from 74.
Then, first, the aquatic plants wp are finely shaken by the propagation of the turbulent flow caused by the forward wave motion of the tube nozzle 10 and the locus of the jet flow dynamically supplied to the target region, and the forward wave motion of the tube nozzle 10 due to the jet flow. The aquatic plant wp is tilted by the water flow.

Next, by suspending the flow of water to each of the tube nozzles 10 of the A-row nozzle groups 77 and 77', the jet flow that is wave-supplied to the target area disappears, so that the aquatic plant wp swings back and the aquatic plant wp Overshoot occurs due to the inertial force of water and water.

After that, water for vibration is sent from the pump 74 to each tube nozzle 10 of the B row nozzle group 78, 78 ′ via the nozzle holding pipe 71.
Then, the aquatic plants wp are finely shaken by the propagation of the turbulent flow caused by the forward wave motion of the tube nozzle 10 and the locus of the jet flow dynamically supplied to the target region, and the water flow due to the forward wave motion of the tube nozzle 10 due to the jet flow. As a result, the aquatic plant wp is tilted toward the A-row nozzle group 77, 77'.
After that, the above operation is repeated.

The control of water flow is controlled by setting in advance the ON time of the electromagnetic switching valve and the suspension time of water flow by observing the inclination and swinging back of the aquatic plant wp using a sequencer or the like.

According to the water environment improving device 4 of the fourth embodiment having the above configuration, in addition to the effects substantially the same as the effects of the above (1) to (7), the following effects can be obtained.
(14) In the water environment improving device 4 of the fourth embodiment, water is alternately ejected from the tube nozzles 10 of the A-row nozzle groups 77 and 77'and the tube nozzles 10 of the B-row nozzle groups 78 and 78'. Since the aquatic plant wp is shaken finely by utilizing the swinging back of the aquatic plant wp, stress can be caused by the aquatic plant wp. As a result, the growth of aquatic plants wp can be suppressed, and the water environment can be improved.

(15) Even in a water area where aquatic plants wp grows over a wide range, those aquatic plants wp are arranged in two rows of A-row nozzle group 77 and B-row nozzle group 78, A-row nozzle group 77'and B-row nozzle group. The turbulent flow generated by the water ejected from the plurality of tube nozzles 10 sandwiched between the 78'and opposed to each other can be sprayed on the aquatic plant wp. As a result, stress can be collectively applied to the aquatic plants wp that are overgrown over a wide range, and the growth of those aquatic plants can be suppressed, so that the water environment can be improved.

Although the present invention has been described above with reference to the above-described embodiments and application examples, the present invention is not limited to the above-described embodiments and application examples.
Various changes that can be understood by those skilled in the art can be made to the structure and details of the present invention. Further, the present invention also includes a part or all of the configurations of the above-described embodiments appropriately combined with each other.

For example, in the first embodiment, the water environment improving device 1 comprises a fluid supply means 20 including a pump 21, a blue-green algae crushing / pressurizing means 39, and a pressurized container 40 constituting the blue-green algae crushing / pressurizing means 39. It is possible to cope with the water area where both blue-green algae and aquatic plants ww are growing, but the present invention is not limited to this.
A configuration in which the pressure vessel 40 and the first and second three-way valves 27 and 37 are not provided, and only the fluid supply means 20 including the pump 21, the nozzle holding pipe 11, and the tube nozzle 10 are provided so that only the aquatic plants wp can be supported. May be.

Further, in the first embodiment, in the water area where the blue-green algae a is not growing, water is sucked from the suction hose 25 by the pump 21 and sent to the discharge hose 24 side, but in the water area where the blue-green algae a is growing. Even if there is, the second three-way valve 37 may be switched so as to stop the water from the pressure vessel hose 44, and the flow may be as described above.

Further, in the water environment improving device 4 of the fourth embodiment, two rows of nozzle groups including row A nozzle group 77 and row B nozzle group 78 and row A nozzle group 77'and row B nozzle group 78'are provided. It has a two-stage configuration, but it is not limited to this.
Of the two-stage nozzle group of the water environment improvement device 4, the one-stage configuration consists of two rows of A-row nozzle group 77 and B-row nozzle group 78, or A-row nozzle group 77'and B-row nozzle group 78'. It may be a water environment improving device composed of a group of nozzles.
With such a configuration, it can be applied to a water area where a large amount of aquatic plants wp is not overgrown with a simple configuration, and an effect substantially similar to that of (14) and (15) can be obtained. ..

Further, the water environment improving device in the modified form may be equipped with a sensor that senses the shaking of the aquatic plant wp.
That is, in the control in the water environment improving device of the fourth embodiment and the modified form, the ON time of the electromagnetic switching valve and the water flow are checked by observing the inclination and swinging back of the aquatic plant wp using a sequencer or the like. The pause time is set and controlled in advance.
However, in this control, even if the natural vibration of the aquatic plant wp changes due to the growth and proliferation of the aquatic plant wp and changes in the water depth and flow, the control is performed while maintaining the same timing, so that the swing back cannot be used well.

Therefore, the water environment improving device of this modified form is configured to sense the shaking of the aquatic plant wp with a sensor, grasp the timing of the swinging back in a timely manner, and operate the electromagnetic switching valve.
Here, various sensing methods can be considered, but in this modified form, the position of the aquatic plant wp is detected by ultrasonic waves, a tilt sensor that vibrates when pushed by the movement of the aquatic plant wp, an acceleration sensor, a strain gauge, etc. One of the sensors is located.
Then, these sensors may be implemented by working on a simulated aquatic plant that imitates the aquatic plant wp and installing it in the vicinity of the aquatic plant wp.

In such a modified form of the water environment improving device, when water is alternately ejected from a plurality of tube nozzles in each nozzle group while the aquatic plant wp is sandwiched between the A row nozzle group and the B row nozzle group, the aquatic plant is ejected. Since the sway of the ww can be detected by a sensor and the timing of the swaying back can be performed in a timely manner, even for a large amount of aquatic plants ww, water is ejected more efficiently and stress is applied. be able to. As a result, the growth of these aquatic plants wp can be suppressed, so that the water environment can be improved.

Further, the water environment improving device of the present invention may be added to the water flow generation stirring device (Patent No. 4420452) taken up as Patent Publication 1.
That is, in the water flow generation stirring device of Patent Publication No. 1, the surface water having a relatively high oxygen concentration is sucked and spouted into a low layer having a low oxygen concentration of 10 m or more to induce the blue-green algae near the surface water to a deep place. However, it is a mechanism that inactivates by light restriction.
At that time, it is necessary to circulate and agitate as much water as possible with a limited amount of water. However, when the water environment improving device of the present invention is added to the discharge port of such a conventional water flow generator, the water is discharged. Since the stirring effect due to the self-excited vibration of the nozzle serving as the outlet is added, the amount of water that can be stirred can be significantly increased.

Further, to explain the conventional method of transporting surface water to the bottom layer by obtaining an ascending current by aeration and causing convection, in the case of a water area such as a reservoir where the water depth is relatively deep, aeration from the bottom causes bubbles to rise. As a result, they collide with each other and coalesce into a large bubble to some extent, which increases the rate of rise of the bubble and draws in the surrounding water to form a strong updraft, resulting in a strong convection.
On the other hand, in the vicinity of the nozzle that ejects the bubbles, a generally steady drawing flow is formed, and the bubbles collide with each other and easily coalesce. Therefore, the total surface area of the bubbles becomes smaller than the volume of the bubbles, and the rate of dissolution in water is reduced. After all, bubbles collide with each other and coalesce, and when they grow too much, they split into bubbles with a certain size distribution, so the force that causes convection is determined by the amount of gas sent.

In order to increase the amount of dissolved oxygen, the life of fine bubbles is extended, or the chances of contact with other bubbles are reduced by ejecting while stirring in water. In the former, microbubbles are the mainstream, but if the life of the microbubbles is too long, the effect of creating convection will not increase.

In the present invention, it is possible to generate strong convection because the nozzle is self-excited and vibrated and jetted into water while stirring, so that the chances of contact between bubbles are reduced and the coalescence of convection-producing bubbles is not so hindered. it is conceivable that.
In addition, since the water depth is generally shallow in the water area where aquatic plants are targeted, the structure is originally less likely to cause convection. Even so, the significance of aeration in the present invention is that the blue-green algae near the water surface are forcibly sucked and stressed and sprayed near the bottom of the water, because the zooplankton that prey on the blue-green algae whose colonies are crushed has a lot of oxygen. The purpose is to create a blended water environment.
Since convection is not expected, it is advantageous that the bubbles that supply oxygen are widely distributed. Therefore, the method in which self-excited oscillating nozzles are scattered as in the present invention is a perfect configuration.

The water environment improving device of the present invention can be used when trying to improve the water environment by suppressing the overgrowth of phytoplankton including blue-green algae and aquatic plants growing in a stagnant place such as a river.

1 Water environment improvement device (first embodiment)
2-4 water environment improvement device (2-4 embodiments)
10 Tube nozzle (self-excited vibrating body)
11 Nozzle holding pipe (vibrating body holding member)
13 Holding member installation means 20 Fluid supply means 21 Pump 24 Discharge hose 25 Suction hose 27 First three-way valve 34 Nozzle side water supply hose 39 Blue colony crushing and pressurizing means 40 Pressurizing container (blue pressurizing mechanism)
41 Colony crushing mechanism of blue-green algae 42 Pipe for collecting blue-green algae 44 Hose for pressurized container 45 Water supply hose 47 Pressurized water discharge pipe 50 Fluid supply means (second embodiment)
51 Tube pump 54 Discharge pressure tube 55 Suction hose 57 In-line mixer 100 Turbulence generator 101 Vibration grid ww Aquatic plant a Aoko
T turbulence J jet L laminar flow

Claims (7)

In a device that suppresses the growth of aquatic plants by causing stress on the aquatic plants by giving turbulent flow to the growing water area of the aquatic plants in the water system where phytoplankton such as blue-green algae exist.
The means for giving turbulence includes a self-excited vibrating body that vibrates by itself by ejecting a fluid supplied from the outside to generate turbulent flow, and a vibrating body holding member that holds the self-excited vibrating body. A characteristic water environment improvement device. In the water environment improvement device according to claim 1.
A water environment improving device characterized in that the vibrating body holding member is provided with a holding member installing means for installing the vibrating body holding member in the growing water area of the aquatic plant. In the water environment improving device according to claim 1 or 2.
A water environment improving device comprising a fluid supply means for supplying the fluid to the self-excited vibrating body. In the water environment improvement device according to claim 3.
The fluid supply means
A pump that sucks up the fluid from a water area containing the phytoplankton via a suction hose, a motor that drives the pump, the pump and the vibrating body holding member are connected, and the fluid from the pump vibrates. A water environment improving device characterized by being provided with a discharge hose that feeds into a body holding member. In the water environment improvement device according to any one of claims 1 to 4.
The self-excited vibrating body is composed of a tube nozzle, and the vibrating body holding member is composed of a pipe member.
A water environment improving device characterized in that at least one tube nozzle is arranged on the pipe member. In the water environment improvement device according to claim 5.
The pipe members are arranged so as to face each other, and each of these pipe members is provided with the tube nozzle.
A water environment improving device characterized in that each of the tube nozzles is provided so that the fluid end ejection port of each of the tube nozzles faces each other, and the fluid is ejected from each of the tube nozzles with a time lag. In the water environment improvement device according to any one of claims 1 to 5.
A means for crushing and pressurizing a colony of blue-green algae that collects and finely pulverizes the blue-green algae together with a fluid.
This blue-green colony crushing / pressurizing means,
A colony crushing mechanism for blue-green algae that abruptly changes the flow velocity of the fluid containing the blue-green algae to finely pulverize the colony of blue-green algae by a shocking pressure change and a large shearing force.
A water environment improving device characterized in that it is configured to include a blue-green algae pressurizing mechanism for compressing false vacuoles of blue-green algae by pressurizing the blue-green algae.

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