JP2594204B2 - Water purification system for zooplankton culture tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for purifying water in a zooplankton culture tank, and more particularly, to an apparatus for purifying water in an zooplankton culture tank which is an initial feed for fish and the like in the production of seeds and seedlings.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Hei 3-39021 discloses "Precision filtration of seawater, mixing of rotifer feed into the filtered water, and supplying of the feed mixed filtered water to a rotifer culture tank. Controlling the amount of feed supplied to the culture tank and the amount of water in the culture tank to be constant, and harvesting rotifers from the culture tank at the same rate as the feed rate of feed-mixed filtered water supplied to the culture tank. And a continuous rotifer cultivation method.

[0003] Numerous experiments have been conducted on continuous culture of zooplankton such as rotifers in accordance with the method disclosed in the above-mentioned publication, and the above-mentioned method shows that the culture density of zooplankton in a culture tank has a certain limit. It became clear that there was.

That is, if the zooplankton in the culture tank grows beyond a certain limit, the culture state becomes unstable and zooplankton dies in large quantities. When the cause was investigated, the density of rotifers in the culture water became 50
It is possible to continuously culture from 0 individuals / ml to 700 individuals / ml, but if this is further increased to 1000 individuals / ml, the number of bacteria in the culture water, the amount of ammonia nitrogen, the concentration of dissolved organic matter, Gradually increases and the bacterial count is 10 ⁷
At that point, rotifers die massively and the culture density drops sharply.

[0005] From the above facts, as a result of research and development, it has been concluded that unless the culture water in the culture tank is always kept fresh, continuous and stable plankton growth cannot be achieved. .

Accordingly, it is a main object of the present invention to provide a water purification apparatus capable of always keeping the culture water inside the zooplankton culture tank fresh.

Further, an object of the present invention is to supply water into a zooplankton culture tank, and to purify the water in the tank without disturbing plankton in the tank. It is to provide a device.

Another object of the present invention is to provide a water purification apparatus for a zooplankton culture tank, such as a rotifer, which has a simple structure and can perform fine control.

[First Embodiment] Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a culture tank 12 to which a water purification device 10 according to a first embodiment of the present invention is attached.

The zooplankton culture tank 12 is a basic water tank for growing and cultivating conventionally known plankton. Seawater filtered is supplied to the culture tank 12 via a conduit 14, and feed is supplied from a feed tank 16 via a conduit 18. Further, the culture tank 12 is provided with a collection tube 20 for taking out the proliferated plankton from the tank.

The water purification apparatus 10 of the present invention is provided so as to stand upright on a culture tank 12 of the kind described above, and is disposed above a predetermined water surface L of the culture tank 12 at the bottom of the tank 12. It has a cylindrical machine frame 22 that extends to a close position. An upper plate body 24 and a lower plate body 26 are fixed to the upper and lower ends of the cylindrical machine frame 22, respectively. The peripheral edge of the cylindrical machine frame 22 extends at a constant interval in a vertical direction. A support member 28 is provided, and a net 3
0 is attached.

As the net 30, a mesh that cannot pass through the zooplankton accommodated in the culture tank 12 is selected. That is, for example, when the plankton is L-type rotifer, about 70 microns, for Artemia, about 100 microns, for daphnia, about 200 microns, and for Euglena, about 10 microns. preferable. The size of the mesh of the net 30 can be appropriately changed according to the type of plankton and other microorganisms and their growth.

On the upper part of the upper plate 24 of the cylindrical machine frame 22,
The variable speed electric motor 32 is fixed, and its output rotation shaft 34
Is extended along the central axis of the cylindrical machine frame 22 from the upper plate body 24 to the lower plate body 26, and upper and lower ends of a shaft 34 are supported by the plate bodies 24 and 26, respectively. One or more blade members 36 are mounted on the rotating shaft 34 in the culture tank 1.
2 is extended from a certain level below the water surface L to a position close to the lower plate 26 and attached. The outer edge of the blade member 36 has a constant angle over its entire length,
For example, a plate 38 made of a flexible material such as a rubber plate is attached. The outer edge of the flexible plate 38 is
End at a position close to the inner wall of the net 30 attached to the support member 28.

A drain pipe 4 is provided on the upper plate 24 of the cylindrical machine frame 22.
The drain pipe 40 is connected to a suitable external drain pump 44, and is controlled so that the water level L in the culture tank 12 is always kept constant.

[Operation of the First Embodiment] The water purification apparatus 10 according to the first embodiment of the present invention is constructed as described in detail above. When the zooplankton is cultivated in the culture tank 12 by feeding the seawater filtered from, and feeding the feed through the conduit 18, the zooplankton in the tank 12 is partitioned by the net 30 of the cylindrical machine frame 22 of the water purification device 10. In the obtained outer region A, bait culture is performed.

When the water purification device 10 is operated during the culture, the motor 32 operates to rotate the blade plate member 38 at a low speed in the direction indicated by the arrow in FIG. The internal water is drained to the outside through a drain pipe 40 disposed inside the cylindrical machine frame 22 so as to always maintain a constant water level L.

As a result, the culture water in the outer region A of the net 30 of the cylindrical machine frame 22 in the culture tank 12 flows through the net 30 into the inside of the cylindrical machine frame 22 of the water purification device 10, and the drain pipe Discharged via 40. Due to the inflow of the culture water, plankton and other organic matter flocs and the like in the culture water are blocked by the net 30 stretched around the cylindrical machine frame 22, and the culture water discharged from the drain pipe 40 Is not flowed. However, plankton and the like riding on the inflow of the culture water in the outer region A tend to adhere to the outer peripheral surface of the net 30.

However, the water purification apparatus 1 of the present invention
0 blade member 36 and a flexible plate body 38 attached to the member at an angle rotate at a low speed,
Plankton and the like that are to adhere to the outer peripheral surface of the net 30 are separated from the net 30 under the action of the flow generated by the rotation of the blade member 36 and the flexible plate 38,
The adhesion to the net 30 can be prevented beforehand. Moreover, the flow is extremely gentle, so that plankton is not damaged.

[Second Embodiment] Next, a second embodiment of the present invention will be described. As shown in FIG. 3, the water purification device 110 of the second embodiment is disposed upright in the culture tank 12 in exactly the same manner as the device 10 of the first embodiment described above, and is a cylinder surrounded by a net 30. A machine frame 122 is provided.

A rotating pipe member 128 extending in the vertical direction is attached to the cylindrical machine frame 122 so that it can be rotated at the center of the upper plate body 124 and the lower plate body 126 of the cylindrical machine frame 122. A nozzle member 130 is attached to a peripheral wall of the pipe member 128 and extends radially and communicates with a hollow portion of the pipe member at a desired interval along the longitudinal axis of the pipe member 128 to spray water.

At least at the tip of the nozzle member 130,
On a horizontal plane passing through the axis of the nozzle member 130, one or a plurality of injection ports 132 are provided which are directed outward at a desired angle, for example, 45 degrees with respect to the axis. Therefore, the pipe member 128 is rotated by the action of jetting water from these jet ports 132.

The upper end of the pipe member 130 is connected to the downstream side of the pump 136 via a suitable conduit 134, and the upstream side thereof extends through the upper plate 124 and extends upward from below the water surface L. 138. Therefore, when the pump 136 operates, a part of the culture water in the culture tank 12 passes through the net 30 of the cylindrical machine frame 122, is sucked by the pump 136 via the conduit 138, and further is pumped by the pump 136 via the conduit 134. It flows to the pipe member 128, and is ejected from the injection port 132 of the nozzle member 130 to form the pipe member 12.
8 and prevents the zooplankton and the like from adhering to the net 30 by the action of the water flow radiated from the jet 132.

The downstream side of the pump 136 and the pipe member 12
5, a drain pipe 140 is provided, and electromagnetic control valves 142 and 144 are disposed in the pipe 134 and the drain pipe 138, as shown in FIG. The amount of water to be supplied can be adjusted.

Further, the conduit 138 passing through the upper plate 124 of the cylindrical machine frame 122 is omitted, and the upstream side of the pump 136 is connected to the filtered seawater supply conduit 14 described in the description of the apparatus of the first embodiment. Alternatively, the nozzle 132 of the rotatable pipe member 128 may be modified so as to eject fresh filtered seawater from the ejection port 132 thereof.

[Operation and Effect of Second Embodiment] The water purification apparatus 110 according to the second embodiment of the present invention has been described in the first embodiment as obvious from the above description. It has the same effect.

In addition, the water purification device 1 of the second embodiment
In 10, the pump 136 can be installed at an appropriate position away from the device without fixing the pump 136 on the upper plate 124 of the cylindrical machine frame 122. Therefore, pump 1
36, or maintenance and management can be facilitated.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a state in which a water purification device according to a first embodiment of the present invention is disposed in a plankton culture tank.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1 and viewed in the direction of the arrow.

FIG. 3 is a schematic longitudinal sectional view of a water purification device according to a second embodiment of the present invention.

FIG. 4 is a partial cross-sectional view taken along a line IV-IV in FIG. 3 and viewed in a direction indicated by an arrow.

FIG. 5 is a schematic view illustrating a modified form of a conduit connected to a pump of the water purification apparatus according to the second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 10 Water purification device of first embodiment 12 Culture tank 14 Filtration seawater supply conduit 16 Feed tank 18 Feed supply conduit 20 Plankton recovery pipe 22 Cylindrical machine frame 24 Upper plate 26 Lower plate 28 Column member 30 Net 32 Variable speed motor 34 Rotary shaft 36 Blade member 38 Flexible plate 40 Drain pipe 44 Drain pump 110 Water purification device 122 of second embodiment 122 Cylindrical machine frame 124 Upper plate 126 Lower plate 128 Rotating tube member 130 Nozzle member 132 Injection port 134 Conduit 136 Pump 138 Conduit 140 Drainage pipe 142 Control valve 144 Control valve

 ──────────────────────────────────────────────────続 き Continuing on the front page (73) Patent holder 000233860 Harima Chemicals Co., Ltd. 671-1 Mizuashi, Noguchi-cho, Kakogawa-shi, Hyogo Prefecture (73) Patent holder 000238278 Fuyo Marine Development Co., Ltd. 1-chome, Nihonbashi Bakurocho, Chuo-ku, Tokyo No. 10-6 (72) Inventor Akinori Hino 1087-6-10 Hirado-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor Yoshihiro Yoshida 4-9-1-2 Chikko, Tamano-shi, Okayama Prefecture Kashima Construction Co., Ltd. 1-2-7 Moto-Akasaka, Minato-ku, Tokyo (72) Inventor Hiroyuki Nishimura 1-12-7 Nozawa, Setagaya-ku, Tokyo Kyowa Hakko Nozawa Dormitory (72) Inventor Masahiro Hayashi Tsukuba, Ibaraki 5-9-3, Tokodai-shi, Harima Chemicals, Inc. Tsukuba Research Laboratories (72) Inventor Seiichi Kanemaki 7-21-15, Shakujiidai, Nerima-ku, Tokyo (56) References JP-A-3-39021 (JP, A)

Claims (5)

(57) [Claims] 1. A cultivation tank for zooplankton, wherein a cylindrical machine frame extending upright is disposed, and the outer periphery of the cylindrical machine frame is surrounded by a mesh net through which zooplankton cannot pass. The outer area partitioned by the net is defined as a breeding and culturing area for the zooplankton, and a rotating shaft having a blade member attached to the center of the cylindrical machine frame is extended, so that water in the cylindrical machine frame is extended. Flow radially outward toward the breeding and culturing area of the zooplankton, and only the culture water not containing the zooplankton in the cylindrical frame is drained to keep the water level in the culture tank constant. A drain pipe connected to a drain pump to extend the inside of the cylindrical machine frame to maintain the water quality in the zooplankton culture tank. 2. The water purification apparatus for an zooplankton culture tank according to claim 1, wherein the rotating shaft is driven by a motor mounted on an upper portion of the cylindrical machine frame. 3. The wing plankton is attached to the wing member at an angle, and the zooplankton in the breeding and cultivation area is attached to the outer peripheral surface of the net by a rotating action of the wing member and the flexible plate body. Claim 1 to prevent adhesion
2. The water purification device for an zooplankton culture tank according to claim 1. 4. A cultivation tank for zooplankton, wherein a cylindrical machine frame extending upright and extending is disposed, and an outer periphery of the cylindrical machine frame is surrounded by a mesh net through which zooplankton cannot pass. The outer region partitioned by the net is a breeding and cultivation region of the zooplankton, and a hollow rotary tube member is attached to the center of the cylindrical machine frame, and the nozzle extends radially to the rotary tube member. A member is provided, and the nozzle at the tip of the nozzle member has a predetermined angle with respect to the direction in which the nozzle member extends, and the rotary pipe member is rotated by discharging water from the nozzle and the inside of the cylindrical machine frame. That the cultivation water of the zooplankton is radiated outward toward the breeding and culturing area of the zooplankton, and the zooplankton-free culture in the cylindrical machine frame A water purification device for an zooplankton culture tank, wherein a drain pipe connected to a drain pump is extended inside the cylindrical machine frame in order to drain only water and maintain a constant water level in the culture tank. . 5. The cylindrical machine frame according to claim 4, wherein the downstream side of the drain pump is branched and connected to the rotary pipe member so that water from the cylindrical machine frame flows into the cylindrical machine frame again. Water purification equipment for zooplankton culture tanks.