JP2542292B2 - Purification method for fish tank water - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for purifying aquarium water of a fish tank used in aquariums, fish farms and the like.

[0002]

2. Description of the Related Art In a fish tank, ammonia is produced from excretions and residual food of fish, which causes respiratory disorders of fish. Therefore, its removal is an important issue.
Therefore, the purification of the fish tank is considered mainly to remove ammonia, and the biological filtration method is generally adopted. In addition, some attempts have been made to purify fish tank water by combining this with ozone treatment.

[0003]

In the purification of fish aquarium water by biological filtration, the aquarium water is passed through filter sand to remove fine organic suspensions from the aquarium water, and
Ammonia in the aquarium water is oxidized to nitrate, which is harmless to fish. However, since the basic form of purification is slow filtration, it is unavoidable that the equipment becomes large-scale, and the bacterial groups in the hearth also have environmental instability factors (for example, salt, water temperature, dissolved oxygen, soluble organic matter). It is difficult to guarantee the desired nitrification rate. Furthermore, it is difficult to completely suppress the outbreak of epidemic pathogens.

On the other hand, when the treatment with ozone is combined, the treatment speed is increased by the strong oxidizing action, the apparatus is miniaturized, and the strong bacterial action effectively causes the generation of pathogenic bacteria. Can be suppressed. However, ozone alone has a small decomposition effect on ammonia. Due to such circumstances, in order to obtain a purifying effect by ozone, a considerable injection amount is required, and it becomes inevitable that dissolved ozone will flow into the water tank. Dissolved ozone is not only harmful to fish itself, but also produces various oxidative substances, and there is a risk of killing fish in the aquarium.

An object of the present invention is to provide a highly efficient and highly safe method for purifying fish tank water that solves the problems hereafter.

[0006]

According to the purification method of the present invention, seawater in a fish tank or fresh water to which bromine is added to approximately the same level as seawater is drawn out from the tank, and the derived tank water flow
Hypobromous acid in water by injecting ozone gas in the effector Io
The emissions reacted product and then, after removing the unreacted ozone in the gas-liquid separating the aquarium water and the hypobromite ion
It is characterized in that it is passed through a manganese dioxide catalyst filter medium that promotes a decomposition reaction with ammonia and then refluxed to a water tank.

[0007]

In the purifying method of the present invention, the aquarium water derived from the fish aquarium flows to the manganese dioxide catalyst filter medium.
Along the way, ozone is injected by an ejecta to decolorize and sterilize, and bromine ions contained in the aquarium water are oxidized by the reaction of Formula 1 to form hypobromite ions (OB
r ⁻ ) is generated. The aquarium water in which the hypobromite ions have been dissolved passes through the manganese dioxide catalyst filter medium after the unreacted ozone is removed. At this time, the decomposition reaction of ammonia in the aquarium water is promoted by the formula 2, and the decomposition reaction of dissolved ozone shown in the formula 3 also proceeds.

[0008]

[Formula 1] O ₃ + Br ⁻ → O ₂ + OBr ⁻

[0009]

[Equation 2] _{^{NH 4 + + OBr - → NH}} 2 Br + H 2 O 2NH 2 B r + OBr - → N 2 ↑ + 3Br - + H 2 O + 2H +

[0010]

[Formula 3] O ₃ → O ₂

A water treatment in which ozone and manganese dioxide are combined is disclosed in Japanese Patent Laid-Open No. 59-139991, but the water treatment shown here is purification of tap water in a water purification plant. The treated water is essentially different from the present invention in that it does not contain bromine, and therefore has a small decomposition effect on ammonia, and no consideration is given to the production and removal of dissolved ozone and oxidizing substances.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a purification system suitable for carrying out the purification method of the present invention.

The fish tank 1 contains seawater. The seawater in the water tank 1 is pumped out of the water tank 1 by the circulation pump 2 and sent to the ejector 3. In the ejector 3, the ozone gas generated by the ozone generator 4 is injected into seawater. The seawater into which the ozone gas has been injected is injected into the reaction promoting filter device 5 from above. The gas-liquid separating section 6 is located above the filtering device 5. In the gas-liquid separation unit 6 of the filter device 5, unreacted ozone is separated into gas and liquid from the seawater into which ozone gas is injected. The unreacted ozone separated from the seawater is filtered by the filtration device 5
It is discharged to the outside and decomposed by the exhaust ozone decomposing device 7. The seawater from which unreacted ozone has been removed passes through the manganese dioxide filter medium 8 contained in the filtration device 5 and is returned to the water tank 1.

According to such a purification method, first, ozone is added to seawater to decolorize and sterilize the seawater and oxidize bromine ions in the seawater to hypobromite ions. Next, after the unreacted ozone is removed from the seawater, the seawater passes through the manganese dioxide filter medium 8. At that time, dissolved ozone in seawater is decomposed, and the decomposition reaction of ammonia is promoted through the hypobromite ion.

At this time, ozone is added to the seawater outside the water tank 1, and before the seawater is returned to the water tank 1, unreacted ozone is removed from the seawater and dissolved ozone in the seawater is removed. . Therefore, there is no risk of ozone and oxidizing substances entering the water tank 1, sufficient safety is ensured, and the use efficiency of ozone can be improved by using a large amount of ozone. Also, for ammonia, ozone has a small decomposition ability by itself, but by using bromine in seawater as a medium, it shows high decomposition efficiency, so that it can exhibit excellent purification ability in combination with its large use. Become. When the aquarium water is not seawater but fresh water, the same effect can be obtained by adding bromine ions to this.

Table 1 shows the results of investigation of the effectiveness of the purification method of the present invention in the purification system of FIG. The bromine ion concentration in raw water (seawater in the aquarium) is 50 to 60 g / m ^3.
Met. OBr ⁻ and dissolved ozone were quantified as total oxidizing substances. As can be seen from Table 1, there is no difference in the amount of ammonia between the system inlet water and the filter inlet water, and the ozone decomposition effect is small only with ozone. However, the amount of ammonia in the outlet water of the filter is low. The purification effect increases as the ozone injection amount increases, and even when a large amount of ozone is injected, dissolved ozone and oxidizing substances do not flow out. As a result, the raw water becomes a manganese dioxide catalyst.
During passage through the filter medium, hypobromite ions and anions in raw water
It was found that the decomposition reaction with monia was significantly accelerated.
Revealed.

[0017]

[Table 1]

[0018]

As is clear from the above description, the method for purifying fish tank water according to the present invention does not cause dissolved ozone and oxidizing substances to enter the tank even when a large amount of ozone is used.
Remarkably excellent in safety. In addition, ozone alone promotes the decomposition reaction even with respect to ammonia, which has a small decomposition effect, and, in combination with the possibility of using a large amount of ozone, the cleaning performance is remarkably excellent. Therefore, it is small, high-performance, fast in processing speed ,
Moreover, a purification system with excellent safety is provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a purification system suitable for carrying out the purification method of the present invention.

[Explanation of symbols]

 1 Fish Tank 3 Ejector 4 Ozone Generator 5 Filtration Device 6 Gas-Liquid Separation Section 8 Manganese Dioxide Filter Media

Claims (1)

(57) [Claims] 1. Sea water in a fish tank, or fresh water containing bromine added to about the same level as sea water is discharged from the water tank, and ozone gas is injected into the stream of the discharged water by an Ejecta machine to make it into water.
A hypobromous acid ion reacted product and then, after removing the unreacted ozone in the gas-liquid separating the aquarium water, the following
Method of purifying fish aquarium water, characterized in that the decomposition reaction of the bromite ion and ammonia is passed through a manganese dioxide catalyst filtering medium Ru is promoted is refluxed to the water tank.