JPH06233988A - Water purifier and water purification - Google Patents

Abstract

PURPOSE:To provide a water purifier and a method for purifing water which do not require an external energy and ensures longer use life than a conventional purification device. CONSTITUTION:This water purifier is equipped with a tank for nickel peroxide catalyst of a nickel sesquioxide hydrate (Ni2O3.H2O) alone or a blend of the nickel sesquioxide hydrate with a trinickel tetraoxide hydrate(Ni3O4.H2O), and/or a nickel dioxide hydrate (NiO2.H2O) as effective components. A liquid to be treated is allowed to pass through the tank for nickel peroxide catalyst.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purifier and a water purification method.

[0002]

2. Description of the Related Art In order to maintain the bactericidal activity in tap water, about 0.8 to 1.0 ppm of hypochlorous acid is dissolved, but this hypochlorous acid produces a peculiar chlorine odor.
The chlorine odor is unpleasant, and therefore, it is common to install a water purifier for deodorization. Conventionally, there have been water purifiers that irradiate tap water with ultraviolet rays to degas and decompose hypochlorous acid, and those that pass through activated carbon to deodorize.

However, the water purifier of the above system requires a certain amount of energy for irradiation of ultraviolet rays, and the activated carbon contained in the water purifier must be frequently replaced due to the limitation of the processable life of the activated carbon. there were.

[0004]

Therefore, it is an object of the present invention to provide a water purifier and a water purification method that do not require external energy and can have a longer life than conventional ones.

[0005]

In order to solve the above problems, the present invention takes the following technical means. (Means of the invention according to claim 1) The water purifier of the present invention comprises nickel trioxide hydrate (Ni ₂ O ₃ .H ₂ O) alone or nickel trioxide trihydrate (Ni ₃ O ₄ .H ₂ O). H ₂ O)
And / or nickel dioxide hydrate (NiO ₂ .H ₂ O)
It is characterized by comprising a nickel peroxide catalyst tank containing the mixture of 1) as an active ingredient, and passing the liquid to be treated through this nickel peroxide catalyst tank. (Means of the Invention of Claim 2) The water purification method of this invention is
Nickel trioxide hydrate (Ni ₂ O ₃ .H ₂ O) alone or nickel trioxide trihydrate (Ni ₃ O ₄ .H)
₂ O) and / or nickel dioxide hydrate (NiO ₂ .H
_A nickel peroxide catalyst containing a mixture of ₂ O) as an active ingredient is brought into contact with a liquid to be treated.

Here, in this specification, nickel peroxide is used.
Is a nickel trioxide hydrate (Ni₂O₃． H
₂O) alone or in combination with this and nickel trioxide trihydrate (Ni₃
O_Four． H ₂O) and / or nickel dioxide hydrate (Ni
O₂． H₂O) refers to a mixture of nickel peroxide
Write as Le.

[0007]

As a result of adopting the above means, the present invention has the following effects. Calcium hypochlorite is dissolved in the liquid to be treated (for example, tap water), but in the liquid to be treated, it is dissociated to be mostly hypochlorous acid. When the liquid to be treated is passed through the nickel peroxide catalyst tank while being brought into contact with the nickel peroxide catalyst, a reaction of Ni ₂ O ₃ + HClO → 2NiO ₂ + HCl 2NiO ₂ + HClO → Ni ₂ O ₃ + HCl + O ₂ occurs. By this reaction, hypochlorous acid is decomposed and an unpleasant chlorine odor is deodorized. By the way, as shown in the above two reaction equations, since the nickel peroxide catalyst repeats redox with each other by hypochlorous acid, there is no need to replace the nickel peroxide catalyst due to its treatable life.

[0008]

EXAMPLES The constitution of the present invention will be described more specifically below. In this example, the water purifier was formed as follows.
A cylindrical glass container having an open upper end and a lower opening cock was used, and a nickel peroxide catalyst was filled in the container, which was used as a nickel peroxide catalyst tank. Nickel peroxide catalyst containing nickel trioxide hydrate (Ni ₂ O ₃ .H ₂ O) and nickel tetraoxide trihydrate (Ni ₃ O ₄ .H ₂ O) in substantially the same amount About 5 kg was used. Then, tap water to be purified here was supplied as a liquid requiring treatment from the upper end of the glass container.

The following measurements were carried out by setting the flow rate of purified tap water flowing out from the open cock of the glass container to 3 different ways. The hypochlorous acid concentration of tap water to be supplied to the water purifier in advance was measured using a product name DR / 2000 spectrophotometer manufactured by Hack Company. In addition, the supplied tap water was passed through the nickel peroxide catalyst tank while being in contact with the nickel peroxide catalyst to be purified, and samples were taken every 5 minutes until 50 minutes had elapsed after starting to flow out from the open cock. The residual hypochlorous acid concentration therein was measured using the above-mentioned instrument. (Example 1) Hypochlorous acid concentration in the water purifier is 0.63 ppm
Tap water was supplied, and the purified tap water was discharged from the open cock of the glass container at a flow rate of about 130 cc / min. The result of measuring the residual hypochlorous acid concentration in this sample is shown in the graph of FIG. (Example 2) The flow rate of tap water flowing out from the open cock was set to about 150 cc / min, and the other measurements were performed in the same manner as in Example 1. The hypochlorous acid concentration of tap water to be supplied is 0.50
It was ppm. The results are shown in the graph of FIG. (Example 3) The flow rate of tap water flowing out from the open cock was set to about 250 cc / min, and otherwise the measurement was performed in the same manner as in Example 1. The hypochlorous acid concentration of tap water to be supplied is 0.42
It was ppm. The results are shown in the graph of FIG.

In each of the measurement results of Examples 1 to 3 above, the residual hypochlorous acid concentration in tap water after purification with the nickel peroxide catalyst was 0.06 ppm to 0.16 p.
It is about pm, which is significantly lower than the concentration of hypochlorous acid in the tap water before purification of 0.42 ppm to 0.63 ppm. In addition, since the water purifier and the water purification method use a nickel peroxide catalyst, it does not require energy unlike the conventional ultraviolet irradiation method, and the nickel peroxide catalyst is oxidized and reduced by hypochlorous acid. Since the above steps are repeated with each other, there is an advantage that the nickel catalyst does not need to be replaced due to its treatable life.

Further, after the water purifier, existing water purifiers such as an activated carbon water purifier, an ultrafilter (UF) and a reverse osmosis membrane (RO) may be attached. By doing so, other odors remaining after the unpleasant chlorine odor of hypochlorous acid is removed by this water purifier can be deodorized by the water purification device described later. By the way, after passing through the water purifier of the above-mentioned embodiment, the hypochlorous acid in the tap water has been decomposed, so that the burden on the activated carbon and the membrane of the water purifier can be reduced. Therefore, in this way, it is possible to eliminate odors other than the unpleasant chlorine odor of hypochlorous acid, and it is possible to reduce the frequency of exchanging activated carbon and membranes of other water purification equipment.

[0012]

As the nickel peroxide catalyst is used in the present invention, no external energy is required and
Since the nickel peroxide catalysts repeat redox with each other by hypochlorous acid, it is possible to provide a water purifier and a water purification method that can prolong the life of the catalyst as compared with the conventional case.

[Brief description of drawings]

FIG. 1 is a graph showing the measurement results of residual concentration of hypochlorous acid in an embodiment of the water purifier of the present invention.

Claims (2)

[Claims] 1. Nickel trioxide hydrate (Ni ₂ O ₃ .
H ₂ O) or a mixture thereof with nickel tetraoxide hydrate (Ni
₃ O ₄ . H ₂ O) and / or nickel dioxide hydrate (N
i0 ₂ . A water purifier characterized by comprising a nickel peroxide catalyst tank containing a mixture of (H ₂ O) as an active ingredient, and allowing a liquid to be treated to pass through the nickel peroxide catalyst tank. 2. Nickel trioxide hydrate (Ni ₂ O ₃ .
H ₂ O) or a mixture thereof with nickel tetraoxide hydrate (Ni
₃ O ₄ . H ₂ O) and / or nickel dioxide hydrate (N
i0 ₂ . H ₂ O) nickel peroxide catalyst having a mixture of H ₂ O) as an active ingredient is brought into contact with a liquid to be treated.