JPH0745004B2 - Filter material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a filtration used for transporting or storing live fish, or for cleaning water in an aquarium used for storing fish for appreciation. Regarding materials (also called filter media).

[Conventional technology]

Conventionally, since a water tank for transporting live fish becomes dirty due to use, it has been practiced to temporarily draw water with a pump or the like for filtration. This filtration was a screen made of a simple cloth or the like, or activated carbon was used.

[Problems to be Solved by the Invention]

However, it is possible to remove solids such as food, discharge, and feces that are present in water by simply filtering with a cloth, but it is difficult to remove smaller solids (turbidity). However, it was difficult to keep the fish alive for a long period of time because it was difficult to adjust the pH, for example, although it was possible to remove turbidity only with activated carbon. Therefore, even with the use of the above filtering device, the remaining feed, discharge or feces are decomposed by aerobic bacteria and decomposed into acidic substances such as nitrous acid, nitric acid and nitrogen, and the seawater is gradually acidified, There is a problem that it damages the fish and the longevity cannot be obtained.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a filter medium capable of utilizing live fish for a long period of time.

[Means for Solving the Problems]

According to the first aspect of the present invention, the filter medium according to claim 1 is mainly composed of shirasu powder, and mixed with shell powder, sawdust, diatomaceous earth and an appropriate amount of binder to form granules, which is then dried. It is formed by firing granules.

The filter material according to the second aspect of the present invention, which is in accordance with the above-mentioned object, is the filter material according to the first aspect of the present invention, in which the amount of shirasu powder is 40 to 70%.

And, the filter medium according to claim 3 is made into a granule of an appropriate size by adhering a mixture of shell powder, sawdust, diatomaceous earth and an appropriate amount of binder around the grain core of Shirasu, It is constructed by drying and firing.

[Operation and Example]

Next, the filter media according to the examples of the present invention will be described.

First, prepare powder of Shirasu (using Shirasu from Kanbara City, Kagoshima Prefecture), dry clay powder, oyster shell powder, an example of shellfish powder, diatomaceous earth, bone meal, sawdust, and With the weight as 100 parts by weight (reference), other raw materials are mixed in the following mixing ratio.

Shirasu powder: 100 parts by weight Clay powder: 35-50 parts by weight Oyster shell powder: 30-45 parts by weight Diatomaceous earth: 30-45 parts by weight Bone powder: 2-5 parts by weight Sawdust: 15-30 parts by weight The mixture is made to have a hardness (clay-like) that can be molded by gradually supplying water, filled into a cubic mold of approximately 1 cm square, once molded into a cuboid granule, and dried and then placed in a furnace. Put inside and bake.

The firing temperature is initially room temperature and gradually increases over 24 hours.
Heat up to 1200-1300 ℃, and 1200-1300 ℃ for about 30-1
Hold for a while and slowly cool.

As a result, the internal sawdust burns to form a space,
The oyster shell powder and the bone powder are decomposed by firing to become CaO, which neutralizes the acidic substances contained in the water to be filtered and further makes them alkaline.

And since the porous shirasu has adsorptivity and absorbs odors (including ammonia etc.) that dissolve inside,
The water is purified.

Furthermore, since this filter material is in the shape of a cinnabar, it has the effect of improving the filling rate of the filter container and increasing the surface area, as compared with the case of making it spherical, and improving the filtering performance.

Table 1 shows the properties of seawater containing live fish inside and using this filter medium in comparison with other seawater.

Here, A is a seafood first-class seawater standard, B is the quality of seawater sent by the Shimonoseki City Minamifudomari water pipe, and C is a tank that uses the filter medium for 24 hours while air is bubbled into the filter medium. Of water. As can be seen from Table 1, the use of the above-mentioned filter material causes the water quality to become weakly alkaline (even if the original water is acidic), the dissolved oxygen does not decrease, and various bacteria do not occur. The fish in the aquarium can stay alive.

In addition, if a piglet taken by the longline fishing method is placed in an aquarium, it will die in about 3 days due to traumatic infectious diseases caused by cutting the teeth with the longline, running wild in the aquarium, being damaged during transportation, and engaging with each other. Therefore, the probability of dying during transportation is high. Therefore, if a filter device using the filter medium according to the above-mentioned example is attached to a water tank and seawater in the water tank is circulated, wounds and internal bleeding will be cured in about 3 days, and even if the upper teeth are cut, it will survive for a considerable period of time. Has been confirmed. Usually, it takes about 10 days to 1 month from the time when a pig is caught until it is put on the market to be put on the market. Therefore, the above-mentioned filter material has a sufficient effect.

Next, a description will be given of a filter medium according to another embodiment of the present invention. First, a grain nucleus of shirasu (having a diameter of about 1 to 2 cm, actually having a diameter of 1 cm, 1.5 cm and 2 cm) was prepared. To do. Next, dry clay powder, oyster shell powder, which is an example of shellfish powder, diatomaceous earth, bone meal, and sawdust are prepared, but this amount is based on 100 parts by weight of diatomaceous earth and the other ingredients are in the following proportions. Prepare the raw material so that it becomes, and add water appropriately to moisten the whole.

Diatomaceous earth: 100 parts by weight Clay powder: 90 to 125 parts by weight Oyster shell powder: 80 to 115 parts by weight Bone powder: 5 to 15 parts by weight Sawdust: 45 to 75 parts by weight Put in, stir appropriately, and granulate so that the diameter becomes about 2 cm to 3 cm.

Dry the granulated granules and gradually heat from room temperature to
Heat to 1200 ~ 1300 ℃ over a period of time, 30 ~ 60 at that temperature
Hold for about a minute and then cool slowly. This completes the manufacture of the filter medium.

Here, a filter medium with holes having a diameter of about 4 mm formed in a right angle direction toward the center direction was produced in this filter medium, and the filter medium with holes was mixed with the filter medium without holes in the range of 10%. By using it, it makes good contact with the inside of Shirasu,
The performance of the filtering material can be further improved.

The properties of the water (seawater) in the water tank when this mixed filter medium was used are shown in Table 2.

Therefore, this filter material also has sufficient filtration performance and water quality improving action like the above-mentioned filter material, and according to the experiment, it is possible to heal wounds and keep alive the live fish in the aquarium, which was impossible in the past. It became possible to.

〔The invention's effect〕

By using the filter medium according to claims 1 to 3, it is possible to purify the water in the aquarium while keeping the quality of the water of the aquarium weakly alkaline, thereby making the live fish in the aquarium mixed for a longer period than before. It became possible to leave it.

Further, it can be used as a filter material for an aquarium of fish for appreciation (especially saltwater fish), and the filter material can improve the water quality and keep the fish in a healthy state for a long time.

Claims (3)

[Claims] 1. A filter material comprising shirasu powder as a main component, shellfish powder, sawdust, diatomaceous earth and an appropriate amount of a binder to form granules, and the granules are fired. 2. The filter medium according to claim 1, wherein the shirasu is contained in the range of 40 to 70%. 3. A mixture of shell powder, sawdust, diatomaceous earth and an appropriate amount of binder is attached around the grain core of Shirasu to form an appropriate size of granules, which is dried and baked. Filter material to be.