JPH05277498A - Sea water purification device - Google Patents

Abstract

PURPOSE:To prevent algae from sticking to the wall surface of an aquarium or pebble and thereby dispense with the trouble to clean the aquarium periodically by providing a nitrification module consisting of a mineral based on oceanic nitrifying bacteria, a basic substance and a sterilization/algae extermination module with a specified ultra-violet beam lamp, and an injector in the forced circulation flow path of the aquarium. CONSTITUTION:Water in an aquarium 1 is forcibly circulated using a pump 2, entering a nitrification module filled with a mineral 3 based on a basic substance. As this mineral 3 has a large amount of oceanic nitrifing bacteria proliferating on the surface, ammonia excreted by fish is oxidized as nitric acid efficiently. Next, the water rendered harmless has pathogenes and algae in the water exterminated by sterilization effects using an ultraviolet lamp 6, in a sterilization/algae extermination module 5, which is capable of generating an ultraviolet dosage of more than 1.6X10<4>W.s/day. After that, air is supplied into the water using an ejector 7, and the water returns to the aquatic tank 1 passing through a pipe 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a domestic or commercial seawater purification apparatus for purifying seawater such as water in an aquarium for ornamental fish and water for aquaculture of fish to sterilize and kill pathogens and algae in the water.

[0002]

2. Description of the Related Art Generally, in an aquarium fish tank, there have been problems such as generation of ammonia and dirt, propagation of pathogenic bacteria, etc. due to the metabolic action of fish, decomposition of uneaten food and excrement.

An overflow type seawater purifying apparatus which has been conventionally proposed for the purpose of improving these problems will be described with reference to FIG. In FIG. 8, the water in the water tank 9 is passed through the overflow pipe 10 to the seawater purification tank 11
Then, ammonia is removed by the filter medium 12 such as oyster shells and coral sand, the pathogen is sterilized by the ultraviolet lamp 13, and the water is returned to the water tank 9 by the pump 14. The oxygen is supplied by aerating the aquarium water with the air pump 15.

Conventionally, for the purpose of sterilizing pathogenic bacteria in water,
UV lamps have been used, but the amount of UV light is at most 1.8.
At the level of × 10 ³ W · s / day, there was no effect in preventing the growth of algae in water.

Further, as algae killing technology, a method using a chemical agent, a method for performing chlorine treatment by electrolysis of seawater, etc. have been conventionally known.

[0006]

However, in the conventional filter medium, since the surface area of the marine nitrifying bacteria attached is small,
There was a problem that the efficiency of seawater purification was poor and, as a result, the size of the seawater purification tank became large.

Also, a few weeks after the start of purification, algae in water grow and algae adheres to the wall surface and paving stones of the aquarium, which necessitates regular cleaning of the aquarium. Conventionally known algicidal techniques include a method of using a chemical agent and a method of chlorine treatment by electrolysis of seawater. However, the drug has an adverse effect on aquatic animals such as ornamental fish and nitrifying bacteria and is not durable. Chlorine treatment by electrolysis of seawater has a bad influence on aquatic animals such as ornamental fish and nitrifying bacteria at high concentration, and at low concentration, no effect is observed and concentration control is difficult. Therefore, there has been a demand for an algicidal technique that does not adversely affect underwater animals such as ornamental fish and nitrifying bacteria and is easy to maintain, but a decisively effective technique has not been known.

[0008] Regarding ultraviolet rays, it has hitherto not been clear as to whether or not simply increasing the amount of ultraviolet rays would be effective in killing algae.

The first object of the present invention is to provide a compact seawater purification device. Further, by killing algae in the water of the present invention, to prevent the adhesion of algae to the aquarium wall surface and paving stones, for the purpose of eliminating periodical aquarium cleaning, from among various means considered, a certain critical It has been found that the irradiation of ultraviolet rays above the value is extremely effective.

[0010]

In order to achieve the above object, the seawater purification apparatus of the present invention comprises a marine nitrifying bacterium, a nitrification module filled with a mineral substance containing a basic substance as a main component, and an ultraviolet ray amount of 1. The sterilization and algaecide module equipped with an ultraviolet lamp capable of producing 6 × 10 ⁴ W · s / day or more and the ejector are arranged in the forced circulation channel of the aquarium water.

[0011]

In the seawater purifying apparatus of the present invention, a large amount of marine nitrifying bacteria are propagated in a mineral substance containing a basic substance as a main component, so that the activity of the marine nitrifying bacteria can be enhanced.

[0012] As a result of a proliferation test using Navicula (Navicula sp.), Which is the most occupied by seawater as algae in water, it was found that the multiplication rate was about four times a day.
FIG. 4 shows the time change of chlorophyll a in the proliferation test.

Navicula sp.
It is considered effective to kill 75% or more of the algae in one day in order to increase the algicidal rate higher than the growth rate.

An algae killing test was carried out using an ultraviolet lamp having an ultraviolet output of 15 W. As algae, Navicula sp., Which was the most occupied by the seawater system, was used. FIG. 5 shows the time change of chlorophyll a in the algaecide test using an ultraviolet lamp.

Based on the results shown in FIG.
cura sp. The ultraviolet irradiation time required to kill 75% of the) is 18 minutes. From this, 75% of algae
The amount of ultraviolet light required to kill the fish is 1.6 × 10 ⁴ W ・ s
Becomes

Since the ultraviolet light amount of the germicidal algaecidal module of the seawater purifying apparatus of the present invention is 1.6 × 10 ⁴ W · s / day or more, 75% or more of algae in water can be killed. Since the algae killing rate is higher than the algae growth rate, the algae in the water do not grow and it is possible to prevent the algae from adhering to the aquarium wall surface or the pavement.

[0017]

EXAMPLE An example of the present invention will be described with reference to FIG.

In FIG. 1, the water in the water tank 1 is forcedly circulated by a pump 2 into a nitrification module 4 filled with a mineral substance 3 containing a basic substance as a main component. Since a large amount of marine nitrifying bacteria propagate in this mineral 3, ammonia excreted by fish is efficiently oxidized to nitric acid. The harmless water is sterilized and killed by the sterilizing and algae killing module 5, and the ejector 7 supplies air into the water, and returns to the aquarium 1 through the pipe 8.

Mineral material 3 was prepared by using granulated blast furnace as a raw material. This granulated blast furnace is produced by rapidly cooling slag generated in a blast furnace of an iron mill at a rate of 0.5 ton per ton of molten iron, and is mainly used as a raw material for cement and a soil improving material. Granulated blast furnace is fired into a porous glassy material (Table 1), and CaO, SiO ₂ , Al ₂ O ₃ , Mg
O is the main component.

[0020]

[Table 1]

A large amount of divalent positive ions such as calcium are present in water on the surface of the mineral substance 3 containing calcium oxide as a main component. On the other hand, since microorganisms are negatively charged, the marine nitrifying bacteria that purify seawater are minerals 3
The mineral 3 is most suitable as a fixed bed of marine nitrifying bacteria.

FIG. 2 shows one of the bactericidal and algal killing modules 5 of the present invention.
An example is shown. FIG. 3 is a sectional view taken along the line ab of FIG. The sterilizing and algae killing module 5 has a diameter of 5.5 cm and a height of 40 cm.
In this container, one 13w output waterproof type ultraviolet lamp 6 for irradiating ultraviolet rays having a central wavelength of 253.7 nm was arranged. After the germs and algae in the water are sterilized and killed by the ultraviolet lamp 6, the water returns to the aquarium 1 through the pipe 8.

The ultraviolet light amount of the germicidal algaecide module is a 13 W ultraviolet lamp, a circulation flow rate of 2.5 l / min in a 50 l water tank,
The water exchange rate is 72 times / day, and the residence time in the bactericidal / algicidal module is 18 s, which is 1.68 × 10 ⁴ W · s / day, and 75% or more of algae in water can be killed. Next, the effect of the seawater purification device of the present invention was determined by the following experiment.

The water tank used in the experiment had an internal volume of 50 l, and the water temperature was kept at 26 ± 1 ° C. by a heater and a thermostat. Nitrification module 4 is filled with 2 liters of mineral matter 3 in which marine nitrifying bacteria have been propagated, and bactericidal and algicidal module 5 has a diameter of 5.5.
13w output waterproof UV lamp 6 that irradiates UV light with a central wavelength of 253.7nm in a container of cm and height of 40cm.
One was used.

In the experiment, 20 seawater fish (Debas sparrows) were placed in a water tank (50 l) and circulated at a circulation flow rate of 2.5 l / min to obtain ammonia nitrogen concentration, nitrite nitrogen concentration, nitrate nitrogen concentration, The amount of algae adhering to the wall surface was measured.

FIG. 6 shows changes in the concentration of ammonia nitrogen, the concentration of nitrite nitrogen, and the concentration of nitrate nitrogen when the seawater purifying apparatus of the present invention is used. From FIG. 6, the seawater purifying apparatus of the present invention has high activity of marine nitrifying bacteria and efficiently decomposes ammonia into nitric acid.

Sterilizing and algae killing module of the seawater purifying apparatus of the present invention
When using (UV amount 1.6 × 10 ^FourWs / day) is
Even after 17 weeks, the algae attached to the walls and paving stones cannot be counted.
there were.

FIG. 7 shows changes in the amount of algae adhering to the wall surface when the conventional seawater purifying apparatus was used (ultraviolet ray amount 1.8 × 10 ³ W · s / day).

When the conventional seawater purifying apparatus was used, the algae adhering to the wall surface started to increase from the second week and the wall surface was covered with algae at the fifth week.

There were no abnormalities in aquatic animals such as ornamental fish and marine nitrifying bacteria.

[0031]

As described above, according to the seawater purifying apparatus of the present invention, since the mineral substance containing the basic substance as the main component is used for the fixed bed of marine nitrifying bacteria, it should be small and compact. Can be done. In addition, the germicidal algaecide module is 1.6 ×
It is possible to irradiate with an amount of ultraviolet rays of 10 ⁴ W · s / day or more, and sterilize and kill pathogenic bacteria and algae in the water, so that it is possible to prevent the algae from adhering to the aquarium wall surface or paving stones. Also,
No abnormalities occur in aquatic animals such as ornamental fish and marine nitrifying bacteria, and the safety is extremely high.

[Brief description of drawings]

FIG. 1 is a sectional view showing the configuration of a seawater purification device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the bactericidal and algae killing module of the seawater purification apparatus of the present invention.

3 is a sectional view taken along the line ab of FIG.

FIG. 4 is a view showing a time change of chlorophyll a in a proliferation test.

FIG. 5 is a diagram showing a time change of chlorophyll a in an algae killing test using an ultraviolet lamp.

FIG. 6 is a diagram showing changes in the concentration of ammonia, nitrous acid, and nitric acid when the seawater purification device of the present invention is used.

FIG. 7: Time-dependent change diagram of algae adhering to the wall surface when a conventional seawater purification device is used

FIG. 8 is a sectional view showing the configuration of a conventional seawater purification device.

[Explanation of symbols]

 1 Water Tank 2 Pump 3 Minerals 4 Nitrification Module 5 Bactericidal and Algicidal Module 6 Ultraviolet Lamp 7 Ejector

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location C02F 3/10 A 3/22 B 3/34 101 D

Claims (1)

[Claims] 1. A forced circulation flow path for forcibly circulating water in a water tank,
Nitrification module consisting of marine nitrifying bacteria and minerals composed mainly of basic substances, germicidal algicidal module equipped with UV lamp, ejector for supplying air to water in circulation channel, and the germicidal algicidal module Is the amount of ultraviolet rays 1.6 × 10 ⁴ W ・ s
/ A seawater purification device equipped with an ultraviolet lamp that can be used for more than a day.