JPH0226940B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for adjusting and maintaining the pH value of breeding water for aquatic animals, particularly fish, to a value close to neutrality.

When tropical fish are kept in a circulating aquarium, their excreta and leftover food are oxidized and decomposed by microorganisms into inorganic substances such as nitric acid, and the breeding water gradually becomes acidic. This is not a good thing for breeding animals such as these. Therefore, in the past, coral sand, shells, etc. were mixed into the gravel put into the aquarium or the filter medium of the filter tank, and the calcium carbonate contained in them prevented the acidification of the breeding water. was planned. However, microorganisms easily adhere to or grow on the surfaces of coral sand and shells, and as time passes, the contact area with water gradually decreases, inhibiting the elution of calcium, and if left as is, the The breeding water will become more acidic (see graph a in Figure 4). Therefore,
It was necessary to periodically replace the coral sand and shells, and to replace the water.

The present invention prevents the adhesion of microorganisms and improves the contact between the PH regulator and water by placing the PH regulator within the irradiation range of ultraviolet rays and irradiating the surface of the PH regulator with ultraviolet rays. The purpose is to constantly adjust and maintain the breeding water at a value close to neutrality by effectively dissolving calcium into the breeding water. It is characterized by comprising a PH adjuster in the form of a shape, a net, a rod, a lump, or a granule, and an ultraviolet irradiation means that includes within its effective irradiation distance the area where the PH adjuster is provided.

The present invention will be described in detail below according to embodiments shown in the drawings.

Figure 1 is a schematic diagram of a circulating purification and PH adjustment device for rearing water, where A is a rearing tank, B is a septic tank, C is a PH adjusting tank according to the present invention, and D is a pump for returning the circulating water to the rearing tank. be. Fig. 2 shows an embodiment of the PH adjusting tank, where 1 is a granular PH adjusting agent such as coral sand or shells, and 2 is a mesh basket to prevent the PH adjusting agent from dissipating. It has sufficient volume for the PH adjuster to swing through it. 3 is a waterproof ultraviolet lamp that irradiates the pH adjuster inside the mesh basket with ultraviolet light. 4 indicates the casing of the PH adjustment tank.

Experimental example 1 First, 40 tropical freshwater fish with a body length of about 3 to 7 cm were raised for several months while being continuously purified using the above circulation purification device without connecting the PH adjustment tank C, and the PH of the breeding water was
When the pH value became acidic at around 5.0, we connected the PH adjustment tank C and started the breeding experiment.
The results shown in the figure are obtained, and the pH value is 6.70, which is near neutrality.
It stabilized at a slightly acidic value of ~6.95. The volume of the breeding tank used in the experiment was 50, the volume of the PH adjustment tank was 1, and the circulation flow rate was 250/hour.
40 ml of coral sand was used as a PH adjuster, and a 100 V, 8 W ultraviolet lamp with a wavelength of 253.7 nm, which is the resonance line of mercury, was used.

Experimental example 2 Next, with PH adjustment tank C connected from the beginning,
When a breeding experiment similar to Experimental Example 1 was conducted for a long period of time, results as shown in the graph shown by b in FIG. 4 were obtained. Note that a in the same figure is a graph showing changes in PH value by a conventional device for comparison purposes.

FIG. 5 shows another experimental example of the PH adjusting tank according to the present invention, in which the PH adjusting agent 1 in the form of particles such as coral sand and shells is housed in a cylindrical mesh cage, and the mesh cage is filled with circulating water. It rotates by being driven by a water wheel 6 provided adjacent to the inlet 5 of the water tank.

Experimental Example 3 When the same breeding experiment as in Experimental Example 2 was conducted using the PH adjustment tank of the example shown in Fig. 5 above,
The results shown in the graph were obtained. The circulation flow rate of breeding water at that time was 300/hour, and the PH
The volume of the adjustment tank used was 1.

In the two embodiments described above, the PH adjustment tank C and the rearing tank A are constructed separately and inserted in series with the septic tank B into the recirculation path of the rearing water purification device. It is not limited to this, and it can be provided integrally with the breeding aquarium or in parallel with the purification device.

Since the present invention is constructed as described above, as long as calcium carbonate is present, it will react with acid and adjust the aquaculture water to a near-neutral value for a long period of time without cleaning the aquarium or changing the water. can be maintained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a circulating purification PH adjustment device according to the present invention, FIG. 2 is a sectional view of an embodiment of the PH adjustment tank of FIG. 1, and FIG. 3 is a graph showing the results of Experimental Example 1. Figure 4 is a graph showing the results of Experimental Example 2 and Experimental Example 3.
FIG. 5 is a sectional view showing another example of the pH adjustment tank used in Experimental Example 3. 1...PH adjustment agent, 2...mesh basket, 3...ultraviolet lamp, 4...PH adjustment tank casing, 6...water wheel.

Claims (1)

[Claims] 1 A plate-shaped, net-shaped, rod-shaped, lump-shaped or granular PH containing calcium carbonate as an active ingredient and provided in circulating water.
1. A pH adjusting device for aquatic animal rearing water, comprising a adjusting agent and an ultraviolet irradiation means whose effective irradiation distance includes a location where the pH adjusting agent is provided. 2. The PH adjuster is coral sand contained in a compartment partitioned with a mesh net that does not substantially prevent the PH adjuster from being washed away, and the circulating water is at least partially contained within the compartment. The PH adjusting device for aquatic animal breeding water according to claim 1, wherein the PH adjusting agent flows upward from the bottom of the compartment at a flow rate sufficient to cause the PH adjusting agent to float. 3 A plate-shaped, rod-shaped, block-shaped, or granular PH regulator that contains calcium carbonate as an active ingredient and is provided in circulating water, and an ultraviolet irradiation means that includes the area where the PH regulator is installed within its effective irradiation distance. The PH adjuster is housed in a cylindrical rotating mesh basket made of a mesh net that substantially transmits light while not allowing the pH adjuster to flow away; The net cage includes a water wheel fixed to its rotation center axis,
A PH adjustment device for aquatic animal breeding water, characterized in that the water wheel is provided corresponding to a jet portion of the circulating water.