JPS6337611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Background of the Invention) The present invention relates to a device for concentrating plankton, and particularly to a device for concentrating zooplankton as feed in cultivation and fishing.

The recent development and progress of seed production technology in cultivated fisheries has been remarkable, and zooplankton, in particular, the "Seaweed rotifer" is generally used as the initial feed for fish.

In particular, when mass producing seeds and seedlings, after culturing the zooplankton (hereinafter referred to as "rotifers") in an aquarium, etc., the culture water is used as much as possible at the stage of transferring and supplying the zooplankton (hereinafter referred to as "rotifers") to the seedling production tank as initial food for fish. It is necessary to remove and concentrate rotifers.

Up until now, when transferring rotifers from a culture tank to a seedling production tank, rotifers were sent together with culture water into a bag made with plankton net, and as much of the culture water was removed as possible to concentrate the rotifers, and this was used to transfer rotifers to seedlings. It is administered to the production tank. Moreover, the above concentration work is carried out exclusively by hand.

Since this work is quite strenuous physical labor, the workers are extremely fatigued, and there are many problems in terms of health management and work efficiency.

By the way, rotifers have a carapace length of approximately 80μ to approximately
They are extremely small animals, up to 400 microns in size, and will die if subjected to severe mechanical vibrations or shocks, or if the environment in which they grow deteriorates. Furthermore,
When concentrating rotifers, it is important to ensure that eggs do not separate from incubating rotifers.

There is a proposal to separate the rotifers from the culture water by sending the rotifers together with the culture water into a concentration tank equipped with a filter, but when the culture water containing the rotifers passes through the filter, there are extremely large numbers of rotifers near the surface of the filter. There is a risk that the filter will become clogged due to the increased density of the filter.

(Objective of the Invention) As a result of considering the above points, the main object of the present invention is to provide a plankton concentration device for concentrating rotifers from culture water containing rotifers without damaging the rotifers or degrading their environment. Our goal is to provide the following.

It is also an object of the present invention to supply culture water containing rotifers to one side of a concentration tank partitioned with a filter for concentrating rotifers through culture water containing rotifers, and to filter the rotifer-containing culture water from the other side. By discharging water and appropriately controlling the amount of supplied water and the amount of discharged water, a water level difference is created between one side and the other side of the filter, and this is used as the filter differential pressure. To provide a plankton concentrator that performs filtration and concentrates rotifers while avoiding mechanical stimulation to the rotifers as much as possible.

A further object of the present invention is to provide a plankton concentrator that concentrates rotifers without clogging the filter in the concentration tank with rotifers.

It is an object of the present invention to provide a plankton concentrator in which air bubbles are applied to the surface of a filter to equalize the density of rotifers in a concentration tank and to supply oxygen necessary for rotifer survival. be.

(Structure of the Invention) Next, a specific structure for achieving the above-mentioned objects and other benefits of the present invention will be explained in detail based on the accompanying drawings.

FIG. 1 is a schematic diagram for explaining one embodiment of the plankton concentrator of the present invention, and the plankton concentrator includes a raw water tank 1 containing culture water containing plankton (hereinafter referred to as "raw water").
0, a concentration tank 12, and a product tank 16. The raw water tank 10 is connected to the enrichment tank 12 by a conduit 20 with a pump 18 and a suitable valve arrangement, e.g. an electric valve 22.

The enrichment tank 12 is comprised of an upright top 30 and an inclined lower part 32, with the bottom wall of the upright top 30 being an upward extension of the bottom wall 34 of the inclined lower part 32, and the concentrating tank 12 side of the conduit 20. The end is open in the concentration tank 12.

The inclined lower part 32 of the concentration tank 12 is divided into a concentration chamber 38 below the filter member 36 and a filtration chamber 40 above the filter member 36 by means of a filter member 36 arranged in an inclined manner parallel to the inclined longitudinal axis thereof. It is divided into Note that the upper end of the filter member 36 is connected to the downwardly extending end of the peripheral wall 41 of the upright top portion 30, and the water sent into the concentration tank 12 through the conduit 20 must pass through the filter member 36 to enter the filtration chamber. It is set so that it cannot be within 40.

The filter member 36 is made of a material that is resistant to corrosion by seawater, such as stainless steel, and has a sufficiently thin mesh that will not pass through rotifers.

A bubble discharge port member 42 is disposed in the lower part of the concentration chamber 38 in close proximity to the filter member 36 . The bubble outlet member 42 is connected to a compressed air supply 48 via a conduit 46 which is provided with a suitable valve arrangement, such as an electric valve 44. The extended portion of the filter member 36 close to the bubble outlet member 42 can be used as a deflector plate 50 to guide the bubbles released from the bubble outlet member 42 so that they rise along the inclined lower surface of the filter member 36. preferable.

At the bottom of the concentration chamber 38, there is a product discharge pipe 52 for recovering plankton concentrated in the concentration chamber 38.
is provided. This discharge pipe 52 is provided with a suitable valve arrangement, for example an electric valve 54. The end of the discharge pipe 52 opens into the product tank 16.

A discharge pipe 56 is connected to the lower part of the filter chamber 40 of the concentration tank 12. This discharge pipe 56 is also preferably provided with a suitable valve arrangement, for example an electric valve 58.

Since the plankton concentrator of the present invention is configured as described above, the culture water containing plankton, that is, raw water is pumped from the raw water tank 10 into the concentration tank 12 via the conduit 20 by operating the pump 18. feed until it reaches a height of .
At the same time as the raw water is supplied to the concentrator, compressed air is sent from the compressed air supply device 48 through the conduit 46 to the lower surface of the filter member 36 of the concentrator chamber 38 as bubbles from the bubble discharge port member 42 .

In this case, the raw water supplied to the concentration tank 12 flows into the concentration chamber 38 along the sloping bottom wall 34 of the tank, and a portion of the raw water passes through the filter member 36 to remove plankton (rotifers) into the concentration chamber 38. Only filtered water without any rotifers flows into the filtration chamber 40.

Then, the valve device 58 is opened to remove the filtered water, which does not contain any rotifers, from the bottom of the filtration chamber 40.

By appropriately controlling the opening degree of the valve of the valve device 58, a water head difference is created in the concentration tank 12 between the raw water in the concentration chamber 38 and the water in the filtration chamber 40, with the filter member 36 as a boundary. If allowed, this will effectively act as a filter differential pressure on plankton filtration.

Filter member 3 from concentration chamber 38 to filtration chamber 40
When the raw water passes through the filter member 6, plankton is separated from the raw water at the lower surface of the filter member 36, but the plankton becomes extremely dense near the filter, and if left in that state, it will clog the filter member 36. Put it away.

However, according to the present invention, as shown in FIG. 2, the air bubbles A released to the lower surface of the filter member 36 of the concentration chamber 38 are affected by the upward force L of the air bubbles themselves and the inclination of the filter member 36 with which the air bubbles A are in contact. Due to the surface, the air bubbles A tend to migrate along the lower surface of the filter member 36 in the direction of arrow F. Due to the movement of the bubbles A, as shown in FIG.
The plankton that tries to clog the mesh is separated from the lower surface of the filter member 36 by the bubbles A and the flow of raw water accompanying the bubbles, and takes advantage of the movement of the water and bubbles to move inside the concentration chamber 38. The plankton are, so to speak, stirred and homogenized so that their density is almost the same in every part of the concentration chamber 38.

Furthermore, some of the bubbles A dissolve into the raw water, which has the effect of allowing plankton to receive the oxygen they need.

After removing the filtrate from the filtration chamber 40 as described above, the valve device 54 of the product discharge pipe 52 is opened,
The concentrated plankton contained in the concentration chamber 38 is collected into the product tank 16.

By repeating the operations described above, it is possible to automatically concentrate and extract plankton from raw water.

Although this invention has been described in detail with respect to its preferred embodiments, the plankton concentrator of this invention can be implemented with various changes in design as necessary within the technical scope described in the claims. is possible.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the plankton concentrator according to the present invention, and FIGS. 2 and 3 are:
They are schematic diagrams for explaining the movement of bubbles in the concentration chamber and the flow state of raw water, respectively. The main relationships between reference numerals and symbols and constituent parts in the accompanying drawings are listed below. 10... Raw water tank, 12... Concentration tank, 16... Product tank, 18... Pump, 20
... conduit, 30 ... upright top, 32 ... sloped lower part, 34 ... sloped bottom wall, 36 ... filter member,
38... Concentration chamber, 40... Filtration chamber, 42... Air bubble discharge port member, 48... Compressed air supply device, 52...
...Product discharge pipe, A...Bubbles.

Claims (1)

[Scope of Claims] 1. A raw water tank for storing culture water containing plankton, a concentration tank for supplying raw water from the raw water tank, and a concentration tank for dividing the concentration tank into a first chamber and a second chamber. Arranged in a tank at an angle, the raw water supplied in the concentration tank is passed from the first chamber to the second chamber, and plankton in the raw water is not sent into the second chamber. a filter member, a bubble discharge port member disposed in the lower part of the first chamber close to the inclined filter member, a compressed air supply device that feeds compressed air to the bubble discharge port member, and a compressed air supply device that supplies plankton from the second chamber. A plankton concentrating device comprising: a device for removing filtered water that does not substantially contain water; and a device for recovering concentrated plankton from the first chamber. 2. The plankton concentrator according to claim 1, wherein raw water is supplied from the raw water tank to the concentration tank via a conduit equipped with a pump device. 3. The device according to claim 2, wherein a valve device is attached to the conduit for supplying the raw water. 4. A patent claim in which the supply of raw water to the concentration tank and the discharge of filtered water from the second chamber are appropriately controlled to create a water head difference between the first chamber and the second chamber. The plankton concentrator according to item 2.