JP6904110B2 - Water treatment equipment - Google Patents

Description

The present invention relates to a water treatment apparatus using a photocatalyst.

Conventionally, water treatment devices using a photocatalyst such as titanium oxide (TiO2) have been proposed (Patent Documents 1 and 2 etc.). In a water treatment device using titanium oxide, active oxygen (hydroxy radicals and superoxide anions) is generated on the surface of titanium oxide when it receives ultraviolet rays, and this active oxygen dioxides organic substances contained in the treated water. Treated water is purified by oxidative decomposition into carbon and water. Hydroxyl radicals are generated by the holes generated by the excitation of electrons on the surface of titanium oxide by ultraviolet rays, which are deprived of electrons from hydroxide ions and the like existing in treated water and air. Superoxide anions are generated by combining excited electrons with oxygen present in the treated water or air.

The water purification device described in Patent Document 1 includes a plurality of plate-shaped photocatalyst members and a flow path of water to be treated as a purification unit provided in the septic tank. The plate-shaped photocatalyst member preferably has a photocatalyst layer containing TiO2 and a plate-shaped light emitter provided on at least one surface thereof. The plate-shaped illuminant emits pulsed light on the surface, and the photocatalyst layer receives the pulsed light. The purification unit has a structure in which strip-shaped plate-shaped photocatalyst members are arranged in a grid pattern. Further, as the photocatalyst layer, a thin film containing a photocatalyst, a thick film, or a film, or glass or a fibrous body on which a photocatalyst is supported is exemplified.
Patent Document 2 describes a water purification device using titanium oxide containing fluorine as a photocatalyst. Then, in order to suppress the desorption of fluorine from titanium oxide in water, an inorganic fixing acid catalyst (zeolite) may be brought into contact with titanium oxide containing fluorine and fixed to an inorganic base material (ceramic paper). Are listed. A stack of a plurality of the obtained photocatalyst sheets is installed in the housing as a photocatalyst unit.

On the other hand, Patent Document 3 describes a paper on which titanium oxide is supported, in which pulp fibers on which an inorganic substance (silica or the like) is supported are used as a support for supporting titanium oxide. Further, the organic paper is decomposed and deteriorated by the action of titanium oxide, but according to this titanium oxide-supported paper, it is described that the decomposition is suppressed as compared with the paper using simple paper as a support.

Japanese Unexamined Patent Publication No. 2013-244440 Japanese Unexamined Patent Publication No. 2012-217922 Japanese Patent No. 3254345

There is room for improvement in the water treatment apparatus using a photocatalyst in terms of increasing the light receiving area and the water contact area per the volume of the container.
In particular, more organic substances (target substances) that are desired to be decomposed in water are required to come into contact with the photocatalyst on the paper surface.
However, for example, when the photocatalyst paper is submerged in the bottom of a container filled with water, the water that comes into contact with the photocatalyst paper is limited, so that the organic substance (target substance) contained in the water far away from the photocatalyst paper is. There is a problem that it will not be disassembled forever.

An object of the present invention is that, as a water treatment apparatus using a photocatalyst, the water contact area can be increased so that the surface of the photocatalyst paper is constantly brought into contact with the water to be purified, and the organic substance (target substance) can be reliably decomposed. To provide a water treatment device.

In order to solve the above problems, the water treatment apparatus of the present invention includes a purifier made of paper containing photocatalyst powder, a first container formed in a conical stand shape and having a wide diameter side open, a water supply port and drainage. It has a second container in which a mouth is formed and covers the entire first container, the first container being rotatably installed in the second container, the first container and the said. The inner surface of the second container is covered with the purifying body, and the water supply port is formed at a position facing the opening in the second container to supply water to be treated into the first container. possible der is, the drain outlet, the formed at the bottom of the second container, it is possible drain water that is purified while in contact with the purifier from the apparatus.

According to the present invention, as a water treatment apparatus using a photocatalyst, the water contact area can be increased so that the surface of the photocatalyst paper is constantly brought into contact with the water to be purified, and the organic substance (target substance) can be reliably decomposed. ..

It is a schematic plan view which shows the water treatment apparatus of embodiment. FIG. 1 is a cross-sectional view taken along the line AA of FIG.

Hereinafter, embodiments of the present invention will be described, but the present invention is not limited to the embodiments shown below. In the embodiments shown below, technically preferable limitations are made for carrying out the present invention, but this limitation is not an essential requirement of the present invention.

<About the configuration>
As shown in FIGS. 1 and 2, the water treatment apparatus 10 of the present embodiment includes a container 1, a purifying body (photocatalyst paper) 2, a UV light 3, and a motor 4. The container 1 includes a truncated cone-shaped first container 11, a bottomed cylindrical second container 12 containing the first container 11 and a motor 4. The first container 11 is connected to the motor 4 and is rotatable. A purifying body 2 is detachably attached to the inner surface of the container 1.

The first container 11 is a so-called cup shape having a truncated cone shape in a side view, which is rotatably provided by a motor 4 about a vertical axis and has an inner diameter of the upper end larger than the inner diameter of the lower end in the vertical direction. The upper side is opened, and it is formed from a circular bottom surface 11a and a truncated cone-shaped side surface 11b rising from the circular outer circumference of the bottom surface 11a. A bearing 5 is provided between the outer peripheral surface of the side surface 11b and the second container 12, and the first container 11 is rotatably held inside the second container 12 by the bearing 5. Has been done. The rotation direction of the first container 11 may be the clockwise direction (forward rotation direction) as shown by the arrow L in FIG. 2 or the counterclockwise direction (reverse rotation direction).

The bearing 5 is provided between the first container 11 and the second container 12 (internal container 12). As a result, the first container 11 can rotate stably. The number and arrangement positions of the bearings 5 may be a plurality of stages, and all of them can be appropriately changed depending on the scale of water treatment. Further, the bearing 5 is provided with a sealing seal (not shown) so as not to leak water from the internal space B formed by the first container 11 and the second container 12.

The second container 12 is provided so as to surround the first container 11 and is formed so as to receive the water overflowing from the first container 11. Specifically, the second container 12 has a double structure in which an internal space is formed with the outer container 122 that covers the inner container 121.
The inner container 121 has a cylindrical shape and is formed so as to surround the circumference of the first container 11. A bearing 5 is attached to the upper end of the inner container 121, and its position is below the opening of the first container 11.
The outer container 122 has a cylindrical shape including a disk-shaped upper surface 122a, a cylindrical side surface 122b, and a disk-shaped bottom surface 122c, and is formed so as to surround the inner container 121. The central axes of the outer container 122 and the inner container 121 are the same. Further, the height of the outer container 122 is above the opening of the first container 11.

In the outer container 122, a water supply port 6 is formed at the center of the disk-shaped upper surface 122a, and a drainage port 7 is formed at the lower end of the cylindrical side surface 122b (so as to be in contact with the bottom surface 122c). The water supply port 6 and the drainage port 7 communicate with the internal space B, respectively. Further, in the outer container 122, the UV light 3 is attached to the disk-shaped upper surface 122a.

The water supply port 6 is located above the opening of the first container 11 and is connected to a water supply side (not shown). The number of water supply ports 6 is one because it is arranged in the central portion of the upper surface 122a, but the number is not limited to this, and may be a plurality. In any case, all the water supply ports are provided at positions where the water to be treated can be poured into the first container 11.
The drain port 7 discharges (purified) water that has passed through the internal space B to the outside of the device. The number of drainage ports 7 is two because they are arranged on both sides of the outer container 122, but the number is not limited to this, and may be one or three or more. In any case, all the drainage ports are provided at positions where the water in the internal space B can be drained.

Since the UV (Ultra Violet) light 3 irradiates the inside of the first container 11 and the internal space B with ultraviolet rays, one UV (Ultra Violet) light 3 is provided near the water supply port 6 on the upper surface 122a of the second container 12 and along the outer circumference. Four are arranged at equal intervals. As the UV light 3, a general mercury lamp may be used. In FIG. 2, the dotted line from the UV light 3 indicates the irradiation range of ultraviolet rays.

The purifier 2 is made of paper containing photocatalytic powder (for example, photocatalytic paper in which titanium oxide fine particles are adhered to the surface of cellulose fibers as a whole including not only the surface of the paper but also the inside), and the first container 11 It is attached to the inside (bottom surface 11a and side surface 11b) and the internal space B of the second container 12 (side surface 121b of the inner container 121 and side surface 122b of the outer container 122).
Since the water treatment device 10 is configured such that the water 8 to be treated moves along the paper surface of the purifying body 2, the water to be treated is more likely to pass perpendicularly to the paper surface of the purifying body 2. However, the purifying body 2 is less likely to be clogged.
Although not shown, the first container 11 and the second container 12 are provided with protrusions and grooves for assembling the purifying body 2 so that they can be easily removed.

The material of the purifying body 2 is only cellulose fiber, titanium oxide, and some paper-making chemicals, and the purifying body 2 can be manufactured by using a conventional papermaking facility.
Titanium oxide contained in the purifying body 2 exerts a catalytic action when exposed to ultraviolet rays. As the titanium oxide, it is preferable to use titanium oxide fine particles having a high content of anatase crystals and an average particle size of about 10 nm. As a result, the purification effect of the purifying body 2 can be improved.

Further, in the present embodiment, by mixing oxygen with the water 8 to be treated, hydroxyl radicals derived from hydroxide ions contained in the water 8 to be treated are mixed with oxygen as activated oxygen in the air. In addition to the superoxide anion derived from the contained oxygen, the superoxide anion derived from oxygen mixed with the water 8 to be treated is generated, so that the purification effect can be improved.
Examples of the method of mixing oxygen with the water 8 to be treated include a method of inserting fine bubbles (nano bubbles and the like) into the water 8 of the treatment target and a method of introducing the water 8 to be treated into fine water droplets into the water supply port 6.

In the present embodiment, since the purifying body 2 is made of paper, it can be easily bent and drilled, and can be manufactured at low cost. As a result, it is possible to replace the deteriorated purifying body 2 without hesitation.
For example, cellulose fibers and P25 (average particle size 30 nm) manufactured by Evonik Degussa were mixed at a ratio of cellulose fibers: titanium oxide = 2: 1 to 20: 1 (mass ratio), and papermaking chemicals were added to make paper. The thing is used for the purifying body 2. The thickness of the paper is about 0.1 mm to 0.7 mm.

The purifying body 2 may be formed into a truncated cone shape and attached to the surface of the first container 11 or the second container 12 by folding the purifying body 2 into a bellows shape instead of the sheet shape. .. As a result, the contact area between the purifying body 2 and the treated water is further increased, and the purifying capacity can be improved.

<About usage, operation, action, effect, etc.>
In the water treatment device 10 of the present embodiment, when water to be treated is put into the water supply port 6, the first container 11 and the second container 12 exhibit a catalytic action by being irradiated with ultraviolet rays from the UV light 3. It is purified by contacting with the purifying body 2 (photocatalyst paper) attached to the surface of the surface, and discharged from the drain port 7. Hereinafter, it will be described with reference to FIG.

First, as shown by arrows F41 and F42, the water (treated water) 8 to be treated containing the organic substance (target substance) to be decomposed is supplied from the water supply port 6 into the first container 11.
Next, as shown by arrows F43 and F44, the treated water poured into the first container 11 reaches the bottom surface 11a and then moves to the side surface 11b due to the effect of centrifugal force due to the rotation of the container, and the first Since the container 11 has a truncated cone shape that spreads toward the end, it moves upward in a spiral along the side surface 11b and jumps out of the first container 11 through the opening.
The water 8 to be treated comes into contact with the purifying body 2 (photocatalyst paper) attached to the bottom surface 11a and the side surface 11b when flowing through the first container 11 as shown by arrows F41 to F44. The purifying body 2 exerts a catalytic action by being irradiated with ultraviolet rays of the UV light 3, and decomposes organic substances (target substances) contained in the treated water. That is, the water to be treated is purified by the photocatalytic action of titanium oxide of the purifying body 2.

Subsequently, as shown by the arrow F45, the treated water 8 overflowing from the first container 12 comes into contact with the purifying body 2 on the inner surface (121b, 122b) of the second container 12 and is purified while being purified in the internal space. It flows downward through B and toward the drainage port 7 provided at the bottom.

In the present embodiment, the purifying body 2 is attached to the entire inner wall of the device, such as the bottom surface 11a and the side surface 11b of the first container 11, the side surface 121b of the inner container 121 of the second container 12, and the side surface 122b of the outer container 122. The contact area between the treated water 8 and the purified body 2 can be increased, and the organic matter (target substance) contained in the water 8 to be treated can be efficiently decomposed.

Finally, the purified treated water 8 is led out of the water treatment device 10 from the drain port 7 as shown by an arrow 46.

As described above, the water treatment apparatus 10 of the present embodiment uses the centrifugal function of the rotation of the first container 11 to constantly bring the water 8 to be treated into contact with the surface of the purifier 2 (photocatalyst paper). Therefore, improvement of water purification performance can be expected. Further, by covering the entire inner wall of the device with the purifying body 2 (photocatalyst paper), the contact area and opportunity between the treated water and the catalyst can be increased, and the purifying action can be maximized.

In the series of operations of the water treatment device 10, the organic matter (target substance) of the water 8 to be treated is decomposed by irradiating the place where the purifying body 2 (photocatalyst paper) is arranged with ultraviolet rays. However, the substance that is not decomposed by the photocatalyst accumulates on the bottom surface 11a of the first container 11. When the dirt on the bottom surface 11a reaches a certain amount, the purifying body 2 may be removed from the first container 11 and replaced with a new purifying body 2. In the present embodiment, since the purifying body 2 can be easily replaced, the water purification performance can always be maintained good.

1 Container 2 Purifier (photocatalyst paper)
3 UV light 4 Motor 5 Bearing 6 Water supply port 7 Drain port 8 Water to be treated 10 Water treatment device 11 First container 12 Second container 11a Bottom surface of first container 11b Side surface of first container 121 Second Inner container of container 121b Side surface of inner container 122 External container of second container 122a Top surface of outer container 122b Side surface of outer container 122c Bottom surface of outer container

Claims (3)

A purifier made of paper containing photocatalytic powder and
A first container that is formed in a truncated cone shape and has a wide diameter opening,
It has a water supply port and a drainage port, and has a second container that covers the entire first container.
The first container is rotatably installed in the second container.
The inner surface of the first container and the second container is covered with the purifying body, and the inner surface is covered with the purifying body.
The water inlet, the formed at a position opposed to the opening in the second container, Ri suppliable der water to be processed within the first container,
The water treatment device is characterized in that the drain port is formed at the bottom of the second container and can discharge purified water to the outside of the device while contacting the purifying body. The water treatment apparatus according to claim 1, wherein the photocatalytic powder is titanium oxide. The water treatment apparatus according to claim 1 or 2, wherein an ultraviolet ray or mercury lamp is installed in the second container.

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