JP2001149945A - Algae controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease specific algae by cooling and dissolving of CO2. SOLUTION: The algae controller which cleans the water of a polluted water area 23 by cooling and dissolving of CO2 using the liquefied CO2 from a CO2 tank 22 includes a heat exchanger 21 which cools the water of this water area 23 by a heat exchange with the liquefied CO2 supplied from the CO2 tank 22 and a CO2 aeration tank 25 which aerates the water by supplying the cooling water from this heat exchanger 21 and the gaseous CO2 vaporized in the heat exchanger 21 to the water, then returns the aerated water to the water area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an algae control apparatus, and more particularly to a method for cooling water in polluted water bodies such as lakes and marshes and dam lakes.
The present invention relates to an algae control device that purifies by dissolving O ₂ and changes the type of algae in a water area.

[0002]

2. Description of the Related Art As is well known, when algae such as blue-green algae breed in water bodies such as lakes and marshes and dam lakes, it is known that they emit harmful and foul odors. For this reason, various proposals have conventionally been made as a countermeasure against algae that propagate in water bodies. The present applicant has proposed, for example, carbon dioxide (CO ₂ ) as shown in FIG.
A device for controlling algae by dissolving the same has been proposed (JP-A-10-235377).

[0003] This apparatus mainly comprises a water tank 1 for dissolving carbon dioxide, external water introduction means 3 for introducing water from a water body 2 such as a lake, a carbon dioxide storage container 4,
A diffuser plate 5 disposed at the bottom of the water tank 1 to blow out countless air bubbles; a compressor 6 to blow out CO ₂ in the pressurized water tank 1 from the diffuser plate 5;
And water returning means 7 for returning the water in the water to the water area 2. In the drawings, reference numerals 8a and 8b denote pressure reducing valves, reference numeral 9 denotes a water pump, and reference numeral 10 denotes a sprinkler.

In the apparatus shown in FIG. 7, water in a water area 2 is sent to a water tank 1 by a water supply pump 9 to dissolve CO ₂ in the water tank 1, and then the water in the water tank 1 is returned to the water area 2 to indirectly operate. First, the pH concentration in the water area 2 is reduced.
Here, when the pH concentration decreases, the priority species of the algae that propagates in the water area 2 change, or the algae themselves decrease in accordance with the change in the environment. As a result, it is possible to suppress the growth, reproduction, and proliferation of algae such as blue-green algae, which emit harmful and foul odors. That is, it is possible to actively control the algae by creating an environment in which the growth, propagation, and proliferation of the algae of the species selected from the algae are difficult.

[0005] Further, conventionally, there is known a water replacement device for performing purification using a heat exchanger using electric power for cooling the water area using an aeration device using air for purification of the water area (particularly, Japanese Patent Application Laid-Open No. H11-157556). JP-A-8-9822).

[0006]

SUMMARY OF THE INVENTION The first invention of the present application is a
The water in the turbid water area is₂Liquefied CO supplied from tank
₂Heat exchanger that exchanges heat with the heat and cools it, and from this heat exchanger
Cooling water and CO vaporized in the heat exchanger₂Supply gas
After returning to the water of the said water area₂
By providing a configuration including an aeration tank, cooling and CO₂
Provides an algal control device that can reduce specific algae by dissolution
The purpose is to do.

According to a second aspect of the present invention, a heat exchanger is provided near a surface of a polluted water area for heat exchange between water near the surface and liquefied CO ₂ supplied from a CO ₂ tank for cooling. Introduction means for introducing the surface water into the heat exchanger, cooling water from the heat exchanger and C vaporized by the heat exchanger;
After supplying O ₂ gas and aerating, by providing an aerator for returning the aerated water to the water in the water area,
It is another object of the present invention to provide an algae control device which can reduce the algae as described above and also cools surface water having a relatively high temperature, so that the cooling effect of the entire water area is high.

[0008]

Means for Solving the Problems The first invention of the present application is an algae control apparatus for purifying water in a polluted water area by cooling and dissolving CO ₂ using liquefied CO ₂ from a CO ₂ tank. Heat exchanger for cooling by exchanging water with liquefied CO ₂ supplied from the CO ₂ tank, and supplying cooling water from the heat exchanger and CO ₂ gas vaporized by the heat exchanger for aeration. after, algae control control apparatus characterized by comprising a CO ₂ aeration unit returning the aerated water to the water in the water area.

In the first invention, the heat exchanger and CO
₂ aeration unit and the one cylindrical casing, the heat exchanger is positioned on top of CO ₂ aeration unit is Tate設, CO ₂ gas in the aeration unit is horizontally pivoted to the cooling water flowing down vertically May be supplied.

In the second invention of the present application, the polluted water in the water area is treated as C
An algae control device that purifies by cooling and dissolving CO ₂ using liquefied CO ₂ from an O ₂ tank, and is disposed near the surface of the water area, and liquefaction where water near the surface is supplied from the CO ₂ tank A heat exchanger for exchanging heat with CO ₂ for cooling, introducing means for introducing the surface water into the heat exchanger, and cooling water from the heat exchanger and C vaporized by the heat exchanger.
An algae control device, comprising: aeration means for supplying O ₂ gas and aeration, and then returning aerated water to water in the water area.

In the second invention, the introduction means includes, for example, a propeller driven by an external power supply. In addition, as the aeration means, for example, a porous plate can be used. The porous plate preferably has a continuous hole through which the CO ₂ gas passes.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the algae control apparatus of the present invention will be described in more detail. The present invention provides a method for cooling water in a polluted water area by utilizing heat absorption when vaporizing liquefied CO ₂ , and reducing the pH concentration of water by dissolving CO ₂ , thereby reducing water in the water area. The main point is to purify and change the type of algae in the water area. Here, the cooling is performed by introducing water in a water area polluted by heat of vaporization when the liquefied CO ₂ from the CO ₂ tank is vaporized into a heat exchanger by a pump or the like. In the heat exchanger, the water in the water area is cooled by the endothermic reaction described above.

On the other hand, liquefied CO ₂ is vaporized in a heat exchanger and taken out as CO ₂ gas. And cooling water and C
The O ₂ gas is sent to the aeration tank and returned to the water area as aerated water. In the aeration tank, CO ₂ dissolution is facilitated by cooling water. The CO ₂ gas dissolves in the water in the water area and functions to lower the pH concentration of the water. When the pH concentration decreases, the growth and reproduction of some algae among the algae are suppressed.

In the present invention, the propeller, the heat exchanger, and the porous plate as the aeration means are provided in a single tank-mounted purge (cylindrical casing) from the water surface by a propeller, a heat exchanger, and a porous plate. They are arranged in the order of the plates. Then, the liquefied CO ₂ from the CO ₂ tank is sent to the heat exchanger, where it is vaporized to generate CO ₂ gas, and the cooling water is obtained by absorbing heat during vaporization. The CO ₂ tank is usually housed in a tank mounted purge, and the tank and the heat exchanger are connected by a pipe or the like. In addition, an external power supply may be used for driving the propeller, or a solar cell may be arranged nearby to serve as a driving source.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 Referring to FIG. Reference numeral 11 in the figure indicates a heat exchanger. The CO ₂ tank 12 is connected to the heat exchanger 11, the CO ₂ tank 12 of the liquid CO ₂ (liquefied C
O ₂ ) is introduced into the heat exchanger 11.
Further, the heat exchanger 11 is connected to a pump 14 for feeding water in the polluted water area 13 into the heat exchanger 11. The heat exchanger 11 exchanges heat between water in the water area 13 and liquefied CO ₂ to generate cooling water and vaporized CO ₂ gas. The heat exchanger 11 is connected to a CO ₂ aeration tank 15 to which cooling water and vaporized CO ₂ gas are supplied. The water aerated in the aeration tank 15 is returned to the polluted water area 13. Reference numeral 51 in the figure denotes a flow control valve for adjusting the CO ₂ gas supply amount according to the outlet pH of the water, the pH of the polluted water area 13, and the like, and reference numeral 52 denotes a flow of water to prevent backflow to the CO ₂ line. 1 shows a check valve for use.

In the first embodiment, the heat exchanger 11 cools the water in the polluted water area 13 by exchanging heat with the liquefied CO ₂ supplied from the CO ₂ tank 12. Pump 14 for feeding water, and the heat exchanger 1
After supplying CO ₂ gas vaporized in the heat exchanger 11 to the cooling water from 1 and aerating, the CO ₂ aeration tank 15 for returning the aerated water to the water in the water area 13 is provided. . That is, in the first embodiment, the water in the water area 13 is cooled by utilizing the heat absorption when the liquefied CO ₂ is
Algae can be more controlled than before by dissolving the O ₂ gas through the aeration tank 15 to lower the pH concentration in the water area 13.

[0017] In fact, Example 1 similar algae control in approximately 10 million tons reservoirs, the water discharge amount of CO ₂ from the CO ₂ tank ^7m 3 / Hr, water 0.55 m ³ to be sent to the heat exchanger
When the pH of the water in the reservoir was measured under the conditions of / min and the blowing period of 11 days, the pH of 8.5 to 9 was reduced to 7 before the treatment. This confirmed the effect of dissolving the CO ₂ gas according to the present invention. In addition, the control effect of algae was confirmed in the water area.

(Embodiment 2) Referring to FIG. However, Figure 1
The same members are denoted by the same reference numerals and description thereof will be omitted. Reference numeral 16 in the figure denotes a donut-shaped cylindrical tank-mounted purge floating in the polluted water area 13. The CO ₂ tank 12 is mounted inside the purge 16. Purge 1
At the bottom of 6, a porous plate 17 as aeration means is arranged. The water in the water area 13 flows through the porous plate 17 inside the cylindrical portion. The purge 16
A propeller 18 as an introduction means is disposed near the water surface of the water area 13 inside the inside. The propeller 18 is configured to be rotated by an external power supply (not shown). The heat exchanger 11 is arranged below the propeller 18.

In the algae control device having such a configuration, CO ₂
While introducing liquefied CO ₂ from the tank 12 to the heat exchanger 11, water from the water area 13, particularly surface water, is introduced into the heat exchanger 11 by the propeller 18, and the water and the liquefied CO ₂ cooled by the heat exchanger 11 are separated. By passing through the porous plate 17, aerated water is obtained.

Therefore, according to the second embodiment, in addition to obtaining the same effect as the first embodiment, since the relatively high-temperature surface water of the polluted water area 13 is heat-exchanged particularly by the heat exchanger 11, the entire water area is cooled. This has the advantage that the effect can be enhanced. Further, since the device is accommodated in the water area 13, there is no need to provide an installation space for the device on land. Further, since the water and the liquefied CO ₂ flow countercurrently in the purge 16, the aeration effect can be enhanced.

In the second embodiment, the case where the propeller is connected to an external power source and rotated is described. For example, as shown by a dotted line in FIG.
The solar cell 19 may be disposed on the 6 so as to be located directly above the propeller 18 to serve as a drive source for the propeller 18.

(Embodiment 3) FIGS. 3 and 4 (A), (B)
See Here, FIG. 3 is a schematic configuration diagram of the algae control device according to the third embodiment, FIG. 4A is an enlarged detailed diagram of a heat exchange / aeration treatment device unit which is one configuration of the device, and FIG. FIG.
FIG. 3A is a cross-sectional view taken along line XX.

As shown in FIG. 3, after high-temperature water in a water area 21 to be purified (closed) such as a pond or a dam is taken in by a pump 22 and cooled in a heat exchange section 24 of a heat exchange / aeration apparatus 23, Similarly, it is sent to the aeration unit 25 of the heat exchange / aeration processing device 23.

On the other hand, liquefied CO₂CO from tank 26₂
Liquid (liquefied CO₂) Of the heat exchange / aeration treatment device 23
Vaporized by heat exchange with the high-temperature water in the heat exchange section 24,
CO ₂(Carbon dioxide) gas, heat exchange and exposure
The air is sent to the aeration unit 25 of the air processing device 23. And said
CO in the aeration unit 25₂Low temperature and low pH aerated by gas
The water is returned to the water area 21 to be purified.

As shown in FIG. 4, the heat exchange / aeration treatment device 23 has a heat exchange section 24 and an aeration section 25 vertically installed in one cylindrical casing 27, and the heat exchange section 24 is connected to the aeration section 25. Is located at the top.

The heat exchange section 24 includes a pair of upper and lower tube sheets 28.
a, 28b, between which a number of tubes 29 extend, and a high-temperature water inlet (tube) provided at the upper part of the cylindrical casing 27
The high-temperature water flowing in from the tube 30 passes through the tube 29 and exchanges heat with CO ₂ gas described later.
It flows down as low temperature water.

On the other hand, a pair of upper and lower tube sheets 2 is provided through a CO ₂ liquid inlet (pipe) 31 provided on one side of the cylindrical casing 27.
The CO ₂ liquid that has flowed into the internal space between 8a and 28b is vaporized by heat exchange with the high-temperature water passed through the tube 29, becomes CO ₂ gas, and is provided on the other side of the cylindrical casing 27. Pipe 33 from the CO ₂ gas outlet (pipe) 32
Through the CO ₂ gas inlet (pipe) 34 provided on the other side of the cylindrical casing 27.

In the aeration unit 25, a ring-shaped mixer plate 36 is arranged in a double cylindrical shape with a predetermined gap from the cylindrical casing 27 at the same level as the CO ₂ gas inlet (pipe) 34. Have been. And the tube 2
The whole amount of the low-temperature water that has passed through the inside 9 is generated in a swirling flow by the fixed blade 39 and flows down inside the mixer plate 36.

In the mixer plate 36, nozzle holes 37 are formed in the circumferential direction, and in combination with the directionality of the CO ₂ gas inlet (pipe) 34 (opened in the tangential direction of the mixer plate 36), CO ₂ gas inlet (pipe)
The CO ₂ gas introduced from 34 is ejected from the nozzle hole 37 into the mixer plate 36 as a swirling flow. The low-temperature water into which the CO ₂ gas has been mixed (aerated) flows out from a low-temperature water outlet (pipe) 38 provided at a lower portion of the cylindrical casing 27.

In the algae control device having such a configuration,
The high temperature water in the water area 21 to be purified is converted into a heat exchange / aeration treatment device 23.
Of the liquefied CO ₂ tank 26
And cooled with CO ₂ liquid. The cooled low-temperature water and the CO ₂ gas vaporized in the heat exchange unit 24 are similarly sent to the aeration unit 25 of the heat exchange / aeration treatment device 23 and mixed (aerated). At this time, the CO ₂ gas inlet (pipe) 3
4 and the direction of the nozzle hole 37 of the mixer plate 36, the CO ₂ gas is ejected into the mixer plate 36 as a swirling flow, so that the CO ₂ gas efficiently dissolves in the low-temperature water swirled by the fixed blade 39. The low-temperature water having a high CO ₂ concentration in the aeration unit 25 is sent to the purification target water area 21.

According to the third embodiment, the same effects as in the first embodiment are obtained. Further, since the high-temperature water in the water area 21 to be purified is cooled by the heat absorption when the liquid CO ₂ is vaporized, the cooling cost is lower than using a heat exchanger using electric power.

Further, since the high-temperature water in the water area 21 to be purified is cooled, 1) the amount of dissolved CO ₂ gas increases, and 2) low-temperature water having a high dissolved oxygen concentration after aeration is formed in the bottom water of the water area 21 to be purified. It is possible to expect effects such as easy flow into the low dissolved oxygen concentration), suppression of blue-green algae that easily occur at a high water temperature, and prevention of function deterioration by avoiding ice adhesion to the heat exchange unit 24.

Further, since the heat exchange section 24 and the aeration section 25 are provided vertically in one cylindrical casing 27, the apparatus can be made compact.

(Embodiment 4) Referring to FIG. 5 and FIG. Here, FIG. 5 is a schematic configuration diagram of the algae control device according to the fourth embodiment, and FIG. 6 is an enlarged view of the heat exchange / aeration treatment device of FIG. However, the same members as those in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

The heat exchange / aeration unit 23 includes a heat exchange unit 2
4 and the inner cylinder 41 forming the aeration unit 25
The high-temperature water flowing from the high-temperature water inlet (pipe) 30 provided on one side of the upper part of the outer cylinder 40 is heat-exchanged with a CO ₂ gas described later when flowing down in the outer cylinder 40 and has a low temperature. It becomes water and flows through the inner cylinder 41 from the lower end opening 41a to the upper end opening 41b and out of the heat exchange / aeration treatment device 23.

On the other hand, the C
The CO ₂ liquid introduced into the O ₂ liquid inlet (pipe) 31 passes through the tube 42 spirally wound around the outer peripheral surface of the inner cylinder 41 from the top to the bottom, and exchanges heat with the high-temperature water. It is vaporized and becomes CO ₂ gas. Then, the vaporized CO ₂ gas is supplied to a tube lower end discharge port 43 opened at a lower portion of the inner cylinder 41.
The low-temperature water is spouted into the inner cylinder 41 to aerate the low-temperature water.

The lower end opening 41a of the inner cylinder 41 located below the tube lower end discharge port 43 has
4 is attached. The water flow straightening vanes 44 are
It is for giving a turning force to the low-temperature water flowing into the inside. Although the illustrated example is a fixed wing, it may be a rotating wing that is rotated by a water flow.

In the fourth embodiment, the same operation and effect as in the third embodiment can be obtained. Further, in the fourth embodiment, since water only passes through the outer cylinder 40 and the inner cylinder 41 and does not pass through the tube 39 of the third embodiment, the structure is simplified and the pressure loss of the driving water is further reduced. There is.

[0039]

As described above in detail, according to the present invention, water in a polluted water area is supplied to a liquefied CO supplied from a CO ₂ tank.
_A heat exchanger for cooling by exchanging heat with the heat exchanger ₂ , supplying cooling water from the heat exchanger and CO ₂ gas vaporized by the heat exchanger, aerating the water, and returning the aerated water to water in the water area. CO ₂
By using a configuration including an aeration tank, cooling and CO ₂
An algal control device capable of reducing specific algae by dissolution can be provided.

Further, according to the present invention, a table of polluted water bodies is provided.
Near the surface, the water near the surface is ₂Supplied from tank
Liquefied CO₂A heat exchanger that exchanges heat with
And introducing the surface water into the heat exchanger.
Means and vaporization in the heat exchanger and cooling water from said heat exchanger
CO₂After supplying gas and aerating, the aerated water is
Aeration means for returning to the water in the water area.
Algae can be reduced in the same manner as described above, and relatively high temperature
Algae control that cools the surface water so that the cooling effect of the whole water area is high
A control device can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an algae control device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of an algae control device according to a second embodiment of the present invention.

FIG. 3 is an explanatory diagram of an algae control device according to a third embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a heat exchange / aeration processing unit which is one configuration of the device of FIG. 3;

FIG. 5 is an explanatory diagram of an algae control device according to a fourth embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a heat exchange / aeration processing unit which is one configuration of the apparatus of FIG. 4;

FIG. 7 is an explanatory diagram of a conventional algae control device.

[Explanation of symbols]

11 ... heat exchanger, 12 ... CO ₂ tanks, 14 and 22 ... pumps, 15 ... CO ₂ aeration tank, 17 ... porous plate, 18 ... tank mounting purge, 18 ... propeller, 19 ... solar battery, 21 ... be purified Water area, 23: heat exchange / aeration treatment device, 24: heat exchange section, 25: aeration section, 26: liquefied CO ₂ tank, 27: cylindrical casing, 29, 42: tube, 30: high temperature water inlet (pipe), 31: CO2 liquid inlet (tube), 32: CO2 gas outlet (tube), 33: pipe, 34: CO2 gas inlet (tube), 36: mixer plate, 37: nozzle hole, 39: fixed blade, 40: outer cylinder 41, an inner cylinder, 44, a water flow rectifying vane, 51, a flow control valve, 52, a check valve.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01F 1/00 B01F 1/00 B C02F 1/66 510 C02F 1/66 510Z 522 522B 530 530A

Claims (3)

[Claims] An algae control device for purifying water in a polluted water area by cooling and dissolving CO ₂ using liquefied CO ₂ from a CO ₂ tank, wherein the water in the water area is supplied from the CO ₂ tank. Liquefaction C
A heat exchanger for cooling by heat exchange with O ₂ , cooling water from the heat exchanger and CO ₂ gas vaporized by the heat exchanger are supplied and aerated, and the aerated water is added to the water in the water area. Return CO
Algae control apparatus characterized by comprising a ₂ aeration unit. 2. The heat exchanger and the CO ₂ aeration unit are vertically installed in a single cylindrical casing at a position above the CO ₂ aeration unit. The algae control device according to claim 1, wherein the cooling water flowing down to the algae is supplied while being swirled horizontally. 3. The water in the polluted water area is CO₂From the tank
Liquefied CO₂Cooling and CO₂Purify by dissolving
An algae control device, wherein the algae control device is disposed near a surface of the body of water, and in front of water near the surface.
Note CO₂Liquefied CO supplied from tank₂Heat exchange with
A heat exchanger to be cooled and the surface water introduced into the heat exchanger
Introduction means, cooling water from the heat exchanger and a heat exchanger
CO vaporized by ₂Aerated after supplying gas and aeration
Aeration means for returning water to the water in the water area.
Algae control device to be featured.