JPH0420225A - Fish farming device - Google Patents

Abstract

PURPOSE: To reduce the required land, water and energy by specifying a fish raising tub and anitrifier tub and circulating water in the fish raising tub through a filter and the nitrifier tub. CONSTITUTION: Lateral cylinders 2 are installed in blind cylindrical fish raising tub 1 and nitrifier tub 4, the surface of the cylinder 2 is made into net, its inside is filled with hollow balls and on the inner surface of its inner cylindrical wall, plural pot-shaped objects are arranged while turning their openings toward the inside of the cylinder 3. The water in the fish raising tub is circulated through a filter 3 and the nitrifier tub by a pump 6. A lot of kinds of fishes can be raised with a little water supply and power.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention relates to a fish farming device, and particularly the required land, amount of water,
This relates to a fish farming device that uses less energy.

[Prior Art] Economically fishing fish from the natural world has a limited quantity, and the amount of fish caught is unstable depending on natural conditions.

Therefore, in order to provide a stable supply of fish, various fish farming methods and
The device is attempted.

However, when it comes to trout farming, for example, is it clear? 700 t/d of flowing water is required for each ton of trout to be raised, and it is becoming difficult to secure such a large amount of clean, flowing water.

In addition, vast fishponds are used for eel farming. Eel growth is best when the water temperature is kept at around 25°C, but keeping a vast fish pond at around 25°C throughout the year is
The heat energy required is enormous, making it economically impossible, and therefore the yield of eel per given area is insufficient.

On the other hand, attempts have been made to raise fish using fish tanks, but nitrogen-containing components such as ammonia ions are generated in the water in the fish tanks due to carp respiration, excretion, and decay of feed. Among these nitrogen-containing components, ammonia ions are particularly harmful to fish, and in order to oxidize them and convert them into relatively harmless nitrate ions, a large number of The disks 20 are attached to one shaft 21 and rotated as shown by the arrows in the figure at a height such that the lower half of each disk is submerged in water. By repeatedly submerging and aerating each disk, a microbial film is formed on its surface. Attempts have been made to attach a biofilm (biofilm) and have the microorganisms in this film decompose harmful nitrogen-containing components, but stable adhesion of the microbial film could not be achieved, and The effect of introducing air into the water was also insufficient.

[Problem to be Solved by the Invention 1] The present invention aims to solve the above-mentioned drawbacks of the prior art and provide a fish farming device that requires less land, less water, and less energy.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a bottomed cylindrical fish culture tank for growing fish; a horizontal cylindrical body provided inside the fish culture tank; The surface is a net and the inside is filled with hollow spheres, and a plurality of urn-like bodies are arranged on the inner surface of the inner cylinder wall with the openings facing inward of the cylinder, and the cylinder is A cylindrical body that is rotatable about a cylindrical shaft; A filter that receives the waste water from the filtration layer and filters out solid matter in the discharged water; A cylindrical body that has the same structure as the cylindrical body; a nitrification tank which is provided inside and receives the filtered water of the filter and oxidizes the nitrogen-containing components contained therein into nitrate ions; The present invention provides a fish farming device characterized by comprising: a circulation device for circulating rM;

[Effect 1 The present invention will be explained in detail using the drawings.

FIG. 1 is a plan view illustrating the arrangement of main parts in an embodiment of the device of the present invention, where ■ is a fish tank, 2 is a cylindrical body, 3 is a filter,
4 is a nitrification tank, 5a is a pipe connecting the fish farming tank 1 and the filter 3, and 5b is the pipe that connects the filtered water from the filter 3 to the nitrification tank 4 through a pump 6.
5c is a pipe that connects the nitrification tank 4 and fish farming tank 1; 5d is a pipe that feeds make-up water to the nitrification tank 4;
e is a pipe for extracting the solid matter filtered by the filter 3 as sludge, 7 is a pedestal on which the cylindrical body 2 is installed, and the arrow in the figure indicates the flow direction of water or sludge.

FIG. 2 is an explanatory cross-sectional view taken along the line A-A in FIG. It is a pot-shaped body with an opening facing inward of the cylindrical body 2, and the cylindrical body 2 is filled with hollow spheres 2c. When the device is in operation, the hollow spheres 2c
Due to the buoyancy, the cylindrical body 2 floats above the water surface 8 by the extent of its volume, and is rotated in the direction of the dotted arrow by a drive device (not shown).

The size and number of fish tanks are not limited, but are determined depending on the type of fish and the amount of fish to be grown, and a feeding device (not shown) or the like is attached thereto. The material of the fish tank is not limited, as long as it can withstand water quality suitable for the fish being raised.
The construction method is not particularly limited either, and it may be constructed as a single piece or as a combination of a plurality of members.

When fish are grown in a fish tank, nitrogen-containing components such as ammonia ions are generated in the water as described above. In the present invention, cylindrical bodies 2 of the same type provided in the fish culture tank 1 and the nitrification tank 4 are used in order to decompose and oxidize these nitrogen-containing components and convert them into relatively harmless nitrate ions, etc. .

As the cross section of the cylindrical body 2 is shown in FIG. 2, the outer periphery of the cylindrical body 2 is formed of a mesh body 2a made of stainless steel or the like, and a large number of pot-like bodies 2b made of stainless steel or the like are arranged on the inner surface of the mesh body 2a with the openings of the cylindrical body 2. The inside of the inner cylinder body 2 is filled with hollow spheres 2C made of plastic, for example.

Due to the buoyancy of the hollow spheres 2c filled inside the cylinder 2,
Approximately its volume is exposed on the water surface 8 of the fish culture tank 1 and the nitrification tank 4, and is rotated in the direction of the dotted arrow in FIG. 2 by a drive device (not shown). The size of the cylindrical body 2 is, for example, a diameter of 62 mm.
5mm x length 400mm - diameter 2500mm x 2500
mm, and the rotational speed is 2 to 2, taking into account the size of the cylindrical body 2, etc.
The speed is about 16 rpm.

The hollow sphere 2c filled in the cylindrical body 2 has a filled volume]
It can have a large area of, for example, 100rn'' per m', and by repeating submersion and aeration at an appropriate speed in the fish culture tank 1 and the denitrification tank 4 by rotating the cylinder 20 times, a sufficient amount of microbial film is formed on the surface. This microbial film not only reduces nitrogen-containing substances harmful to fish, but also allows air to enter the water.

In addition, a large number of urn-like bodies 2b are disposed in the cylindrical body 2, and as the cylindrical body 2 rotates, its position changes alternately between underwater and in the air, and when underwater, the opening faces upward. The pot-like body 2b that has received water comes out into the air and pours the received water onto the hollow sphere 2c, and the opening faces downward and releases the water, and the pot-like body 2c that has received air inside is underwater. Once inside, the air is repeatedly released between the hollow spheres 2c, which improves the contact with the air and activates the microbial film, resulting in BOD5
A large reduction amount of 8 to 12 kg/cylindrical body rn'/d can be obtained, and the number of air injectors into the water can be increased, making it possible to increase the amount of fish per unit volume of the fish tank. .

Since the cylindrical body 2 is floated on the water surface of the fish culture tank 1 and the nitrification tank 4 by the frame 7, only a small amount of power is required for rotation.

Note that when the cylindrical body 2 is installed in the illustrated position in the fish culture tank 1, a water flow shown by the arrow is generated in the fish culture tank 1, which promotes movement of the fish, increases the amount of fish collected, and improves growth.

The water in the fish tank 1 containing solid matter such as floating fish excrement and feed residue flows down by gravity to the filter 3 installed at a lower position than the fish tank 1 by a vibrator 5a, and the filtered water is pumped. 6 and a vibrator 5b to the nitrification tank 4 provided at a higher position than the fish culture tank 1, and the filtered solids are discharged as sludge out of the apparatus by a vibrator 5e.

The type of filter 3 is not particularly limited, but for example, the wastewater from the fish culture tank 1 is introduced into the inside of a horizontal cylinder covered with a nylon net, and the solid matter is filtered out with a net. A type of sludge is preferably used in which water is sprayed on the solid matter remaining inside the screen from the top of the screen to discharge it as sludge. The capacity of the filter is appropriately determined depending on the species of fish, the number of fish grown, etc.

Since the nitrification tank 4 uses the cylindrical body 2 to further reduce harmful nitrogen-containing components in the water, no fish are kept there. Water lost due to discharge of the solid matter as sludge, etc. can be replenished into the nitrification tank using, for example, a vibrator 5d.

As mentioned above, the apparatus of the present invention requires only a small fish culture tank l, i.e., a small site area, due to the strong nitrification effect of the cylinder 2, and the amount of make-up water is small enough to be carried away by the solid sludge. Since the filter 2 rotates while floating on the water surface 8, only a small amount of power is required to drive it, and the water level of the fish tank 1 is set lower than the water level of the nitrification tank 4, and the filter 3 is set lower than the water level of the fish tank 1. Therefore, the water in this device is transferred to the nitrification tank 4.
- The power required for the pump 6 for pumping the filtrated water of the filter 3 to the nitrification tank 4 is sufficient as the power for circulating the water by gravity flowing down from the fish culture tank 1 to the filter 3.

Furthermore, since the apparatus of the present invention requires a small amount of water, only a small amount of energy is required to raise or lower the water temperature depending on the species of fish.

Although not shown in the drawings, the device of the present invention includes, as necessary, a valve for adjusting the water flow rate of each vibrator, a water temperature measurement/control device, and a water pH and component measurement/control device. , an emergency oxygen overflow device, etc. can be attached.

[Example] Eels were grown using the apparatus of the present invention of the type shown in FIGS. 1 and 2.

Four fish culture tanks were used with a diameter of 5 m and a depth of 2 m, and one nitrification tank was used with a diameter of 3 m and a depth of 1.5 m. The cylindrical body has a diameter of 1.27 m and a length of 1.37 m (inner volume: 1.27 m).
68 m') and the rotation speed was 15 rpm. The filter introduces wastewater from the fish tank into a cylinder lined with a nylon net, filters out solids on the inside of the net, and sprays water from above the net to remove the solids remaining inside the silk. A type that is discharged as sludge was used.

Using this device, it is possible to raise 9,000 kg of eel per year by maintaining the water temperature at around 24 to 29°C, and the supplementary water required is only about 2 rn'/d. The total area was only about 165m2.

[Effects of the Invention] According to the present invention, a large amount of horns can be grown using a small amount of supplementary water and energy using a simple device installed in a small area of land.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the planar arrangement of essential parts in an embodiment of the present invention, FIG. 2 is an explanatory diagram of a cross section taken along the line A-A in FIG. 1, and FIG. It is a schematic perspective view of an attachment member. 1... Fish culture tank 2... Cylindrical body 2a...
Net body 2b... Urn-shaped body 2c... Hollow sphere
3 mountain filtration rock 4... Nitrification tank 5a, 5b, 5c, 5d, 5 e- = Vibro pump 7... Frame 8... Water surface 2o... Disk 21... Axis

Claims (1)

[Scope of Claims] 1. A cylindrical fish tank with a bottom for raising fish; a horizontal cylindrical body provided inside the fish tank, the surface of which is a mesh, and the inside of which is filled with hollow spheres. A cylindrical body, in which a plurality of urn-like bodies are arranged on the inner surface of the inner cylindrical wall with openings facing inward of the cylindrical body, and the cylindrical body is rotatable about a cylindrical axis as a rotation axis. and; a filter that receives the discharged water of the fish culture layer and filters and removes solid matter in the discharged water; a cylindrical body having the same structure as the cylindrical body is provided inside and receives the filtrate of the filter; A nitrification tank that oxidizes nitrogen-containing components contained in the fish tank into nitrate ions; and a circulation device that circulates water in the fish tank through the filter and the nitrification tank. Fish farming equipment.