JP2000189802A - Cleaning functional material and waste liquid cleaning device using this functional material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the cleaning efficiency, and at the same time, enable the maintenance to be simply performed at a low cost by laminating a flame spray-coated layer to which fine titanium dioxide particles are made to adhere to the surface of a base consisting of an inorganic material or a metal. SOLUTION: Fine particles of copper fused by an arc flame spray coating process are sprayed onto the surface of an aluminum plate as a base to form a flame spray- coated layer 2 consisting of copper. On the other hand, fine titanium dioxide particles are mixed with a solvent such as water and this mixed solution is stirred to generate a dispersion of titanium dioxide 3 and then this dispersion is applied to the flame spray coated layer 2. Further, the aluminum plate is baked in a hydrogen reduction furnace to form the aluminum plate with the laminated flame spray coated layer 2 to which the titanium dioxide 3 sticks. After that, a cleaning tank 4 which has an inner wall formed of the flame spray coated layer 2 and is of a rectangular parallelepiped shape with an open upper face, is formed. In addition, the cleaning tank 4 and a waste liquid tank 8 are connected to each other by a pipe 6 and at the same time, a black light which emits an ultraviolet light to a part above the aperture part of the cleaning tank 4, is installed to constitute a circulation-type waste liquid cleaning device 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purifying material and a waste liquid purifying apparatus using the same.

[0002]

2. Description of the Related Art Waste liquid discharged from factories and the like is purified by a waste liquid purifying device, and is reused after impurities are removed. As such a waste liquid purifying device, a device employing a precipitation system and a device provided with a filtering means (filter) made of cloth, metal, or synthetic resin are known.

[0003]

However, a waste liquid purifying apparatus employing a sedimentation method cannot decompose organic substances such as oil, and it takes a long time for minute impurities to precipitate, resulting in poor purification efficiency. There is a disadvantage that. On the other hand, the waste liquid purifying apparatus provided with the filtering means has good purification efficiency, but requires frequent replacement of expensive filtering means, which is troublesome and uneconomical in maintenance.

An object of the present invention is to solve the problems of the above-mentioned conventional waste liquid purifying apparatus and to provide an economical waste liquid purifying apparatus which has good purification efficiency and is easy to maintain.

[0005]

According to the first aspect of the present invention, the sprayed layer to which the titanium dioxide fine particles are attached is formed on the surface of a substrate made of an inorganic material or a metal. It is in the purification function material laminated. According to a second aspect of the present invention, there is provided a purifying tank provided with a purifying functional material in which a sprayed layer to which titanium dioxide fine particles are adhered is laminated on the surface of a base made of an inorganic material or a metal, and UV is applied to the purifying tank. And a UV irradiation lamp for irradiation. The configuration of the invention described in claim 3 is the same as that of claim 2,
The substrate is a metal substrate made of stainless steel or aluminum, and the sprayed layer is a metal layer made of copper.
The structure of the invention described in claim 4 is to spray a metal or ceramic on the surface of a base made of an inorganic material or a metal, apply a dispersion of titanium dioxide fine particles on the surface of the sprayed layer after the spraying, A method for producing a purification functional material, characterized by firing a substrate.

[0006] The purifying functional material (Claim 1) is characterized in that the metal sprayed layer having the titanium dioxide fine particles adhered is laminated on the surface of the substrate, so that the metal sprayed layer is irradiated with UV (ultraviolet rays) to emit the dioxide. Electrons jump out of the titanium surface, and the titanium dioxide has a strong oxidizing and reducing power (that is, the titanium dioxide is activated as a photocatalyst). Therefore, the wastewater purifying apparatus using such a purifying functional material (claim 2) can efficiently purify the waste liquid by the strong oxidizing power and reducing power of the activated titanium dioxide. Also, titanium dioxide fine particles are attached to the metal sprayed layer laminated on the surface of the base, and the surface of the metal sprayed layer is rough, so that the titanium dioxide fine particles attached to the metal sprayed layer are hard to be detached, and Since a large amount of titanium dioxide fine particles can be attached per area, the waste liquid can be purified very efficiently.

Further, the waste liquid purifying apparatus in which the substrate is a metal substrate made of stainless steel or aluminum and the metal sprayed layer is a metal layer made of copper (claim 3). Extremely high adhesive strength.
In addition, since the titanium dioxide fine particles adhere to the metal spray layer laminated on the surface of the base, the strong oxidizing and reducing power of the activated titanium dioxide despite the base being a metal substrate. Therefore, the metal substrate does not corrode.

On the other hand, a method for producing a purifying functional material, comprising spraying a metal or ceramic on the surface of a substrate, applying a dispersion of titanium dioxide fine particles to the surface of the sprayed layer after thermal spraying, and then firing the substrate. According to 4), a purification function material having a high purification function of the waste liquid can be manufactured very inexpensively and easily. Further, the titanium dioxide fine particles are very firmly attached to the metal sprayed layer.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a waste liquid purifying apparatus of the present invention will be described.
This will be described in detail with reference to the drawings.

[Example 1] <Manufacture of a purifying functional material> Melted fine particles of copper (pure copper and phosphor bronze) are sprayed on the surface of an aluminum plate by an arc spraying method using a thermal spray gun, and the surface of the aluminum plate is sprayed. Then, a thermal spray layer made of copper was formed. On the other hand, titanium dioxide fine particles having an average particle diameter of about 100 μm were mixed with a solvent such as water or alcohol, and the mixture was sufficiently stirred to obtain a titanium dioxide dispersion. And
The dispersion is applied to a sprayed layer formed on the surface of an aluminum plate. Thereafter, the aluminum plate is baked in a hydrogen reduction furnace under an atmosphere of 550 degrees Celsius for about 1 hour to obtain titanium dioxide. To obtain an aluminum plate on which a thermal sprayed layer to which was adhered was laminated. FIG. 1 shows a conceptual diagram of the obtained aluminum plate (purifying function material).

<Manufacture of Waste Liquid Purification Apparatus> Further, using the obtained aluminum plate, a flat rectangular parallelepiped purification tank having an open upper surface was formed so that the inner wall became a sprayed layer to which titanium dioxide was adhered. . Further, the formed septic tank and the waste liquid tank were connected by a pipe, and a pump was connected downstream of the waste liquid tank. Then, a circulation type waste liquid purifying apparatus was obtained by installing a black light for irradiating UV (ultraviolet) above the opening of the septic tank. FIG. 2 shows the obtained waste liquid purifying apparatus.

<Waste Liquid Purification Experiment and Evaluation> The waste liquid tank 8 of the obtained waste liquid purification apparatus 9 was filled with the waste liquid of the cleaning agent after cleaning the mechanical parts. Then, while irradiating the septic tank 4 with UV light by the black light 5, the pump 7 was continuously operated for about 42 hours to try to purify the waste liquid. Then, the degree of purification of the purified waste liquid was sensory-evaluated with respect to the color (transparency), concentration, and oil decomposition degree of the purified waste liquid. The residual state of titanium dioxide on the surface was examined by magnifying and observing the inner wall of the purified water purification tank 4 using a microscope. Furthermore, the copper sprayed layer on the inner wall of the septic tank was peeled off, and the damage status of the aluminum plate was examined. Evaluation result of purification degree, residual state of titanium dioxide,
FIG. 3 shows the damage state of the aluminum plate.

<Evaluation Results of Purification Degree> From FIG.
It can be understood that the waste liquid purifying device 9 can purify the waste liquid very efficiently. In addition, in the waste liquid purifying apparatus 9 of Example 1, it can be seen that the titanium dioxide 3 on the inner wall of the purification tank 4 after purification was not peeled off at all, and the aluminum plate 1 as the substrate was not damaged at all.

[Comparative Example 1] <Manufacture of waste liquid purifying apparatus> A dispersion of titanium dioxide obtained by the same method as in Example 1 is applied to the surface of an aluminum plate (an aluminum plate on which a sprayed layer is not laminated). After that, the aluminum plate was fired in a hydrogen reduction furnace under the same conditions as in Example 1 to obtain an aluminum plate having titanium dioxide adhered to the surface. Then, using the obtained aluminum plate, a septic tank was formed so that the inner wall became the titanium dioxide adhered surface.
By the same method as described above, a circulation type waste liquid purifying apparatus was obtained.

<Waste liquid purification experiment and evaluation> Using the obtained waste liquid purification apparatus, a method similar to that of Example 1 was used.
Attempt to purify waste liquid. Then, the degree of purification of the waste liquid after purification was evaluated in the same manner as in Example 1. Also,
By the same method as in Example 1, the residual state of titanium dioxide on the inner wall of the septic tank after the purification and the damage state of the aluminum plate were observed. FIG. 3 shows the evaluation results of the degree of purification, the residual state of titanium dioxide, and the state of damage to the aluminum plate.

<Evaluation Results of Purification> From FIG.
It can be understood that the waste liquid purifying device of the above can also efficiently purify the waste liquid. On the other hand, in the waste liquid purifying apparatus of Comparative Example 1, the degree of separation of titanium dioxide on the inner wall of the septic tank after purification is large,
It can also be seen that the aluminum plate as the substrate is significantly damaged.

Comparative Example 2 <Manufacture of Waste Liquid Purification Device> A flat rectangular parallelepiped purification tank having an open upper surface was formed using an aluminum plate (an aluminum plate on which nothing was laminated). Then, the obtained septic tank and the waste liquid tank were connected by a pipe, and a pump was connected downstream of the waste liquid tank. Furthermore, a circulating waste liquid purifying apparatus was obtained by installing a cloth filter on a pipe connecting the septic tank and the waste liquid tank.

<Waste liquid purification experiment and evaluation> Using the obtained waste liquid purification apparatus, in the same manner as in Example 1,
Attempt to purify waste liquid. Then, the degree of purification of the waste liquid after purification was evaluated in the same manner as in Example 1. Also,
By the same method as in Example 1, the residual state of titanium dioxide on the inner wall of the septic tank after the purification and the damage state of the aluminum plate were observed. FIG. 3 shows the evaluation results.

<Evaluation Results of Purification> From FIG.
It can be seen that the waste liquid purifying device of the above is inefficient in purifying the waste liquid.

The constitution of the purifying material and the waste liquid purifying apparatus of the present invention is not limited to the embodiment described above, but includes the type of the substrate, the material of the thermal spray layer, the thermal spraying method and the shape of titanium dioxide. -The attachment method, the shape and structure of the septic tank, the shape and structure of the waste liquid tank, the method of connecting the pipes, the method of installing the pump, the type of the UV irradiation lamp, and the like are set as necessary without departing from the spirit of the present invention. Can be changed as appropriate.

For example, the septic tank is not limited to a sprayed tank having titanium dioxide adhered on the entire inner wall, but a sprayed tank having titanium dioxide adhered on at least a part of the inner wall. But it is good. Further, the substrate metal forming the septic tank is not limited to aluminum, and other metals such as stainless steel, iron, and nickel can be used as needed. Furthermore, the septic tank does not necessarily need to be formed of metal, but may be formed of cement or the like and then laminated with a sprayed layer to which titanium dioxide is adhered.

In addition, the waste liquid purifying apparatus of the present invention is not limited to the spraying tank having titanium dioxide deposited on the entire or a part of the inner wall of the cleaning tank. The sprayed layer that has been deposited is laminated on a substrate made of an inorganic material or a metal), and may be attached to a purification tank. When such a configuration is adopted, the material forming the septic tank is not limited to metal at all. FIG. 4 shows an example of a case where the purification function material is attached to the purification tank. The purification tank 4 is provided with a plate-like purification function material 10 along the axis of the shaft 11 (in the same manner as in the first embodiment). The formed purification wings 14 are arranged in parallel in the lateral direction. The purifying blades 14 are rotatable by the operation of the motor 13 via the gears 12a and 12b. According to the waste liquid purifying apparatus in which such a rotatable purifying function material is attached to a purification tank, it is possible to purify waste liquid extremely efficiently. When the purifying function material is rotatably attached to the purifying tank as shown in FIG. 4, the number of purifying blades is not limited to two, but may be one or three or more.

The metal to be sprayed is not limited to copper.
It is also possible to spray metal such as iron, aluminum and nickel. Further, it is possible to spray not only metal but also ceramic. On the other hand, the method of spraying is also
The invention is not limited to arc spraying, and when spraying ceramics, a plasma spraying method can be used.
However, when copper is sprayed on an aluminum substrate, there is an advantage that the sprayed layer is difficult to peel off from the substrate.

In addition, the firing method is not limited to firing using a hydrogen reduction furnace, and conditions such as firing temperature and firing time are not limited to those in the above embodiment.

The UV irradiation lamp for irradiating the metal sprayed layer containing titanium dioxide with UV is not limited to the black light, and other UV irradiation lamps can be used. It is possible to activate titanium dioxide using only sunlight, but using a UV irradiation lamp has the advantage that titanium dioxide can be activated more efficiently.

On the other hand, the method of adhering titanium dioxide to the sprayed layer is not limited to the method of applying a water / alcohol dispersion of titanium dioxide, but a method of dispersing titanium dioxide in a solvent other than water or alcohol is used. It is also possible to apply to the sprayed layer. Furthermore, when applying a dispersion liquid in which titanium dioxide is dispersed in a solvent other than water to the sprayed layer, it is possible to mix a binder in the solvent. When such a configuration is employed, there is an advantage that the adhesive strength of titanium dioxide to the thermal spray layer is further increased. In addition, the size of the titanium dioxide to be adhered to the sprayed layer is not limited at all, and the average particle size is 1 μm.
From the following ultrafine particles to relatively large particles having an average particle size of several hundred μm, it can be suitably used. It is preferable to use titanium dioxide fine particles having an average particle diameter of 50 μm to 100 μm because a high waste liquid purifying function can be obtained.

The purifying functional material of the present invention can be used not only for producing a purifying apparatus for cleaning waste liquid for washing mechanical parts, but also for purifying the same.
Waste liquids other than machine part cleaning waste liquids and various liquids other than waste liquids
It can also be used for manufacturing gas and solid purification devices.

[0028]

The purifying functional material according to claim 1 is
Since the metal spray layer to which titanium dioxide fine particles are adhered is laminated on the surface of the base, irradiating the metal spray layer with UV causes the titanium dioxide to have a strong oxidizing and reducing power. It can be suitably used for purification applications such as.

[0029] The wastewater purifying apparatus according to the second aspect has a purifying tank provided with a purifying functional material and a UV irradiation lamp.
By using the reducing power, the waste liquid can be efficiently purified. In addition, since the titanium dioxide fine particles adhere to the rough metal spray layer laminated on the surface of the base, the titanium dioxide fine particles adhered to the metal spray layer are difficult to be detached, and a large amount per unit area. Since the titanium dioxide particles are attached, the purification efficiency of the waste liquid is high.

According to a third aspect of the present invention, since the base is a metal substrate made of stainless steel or aluminum, and the metal sprayed layer is a metal layer made of copper, the metal sprayed metal is sprayed onto the metal substrate. The bond strength of the layers is very high. In addition, since titanium dioxide particles adhere to the metal sprayed layer laminated on the surface of the substrate, the strong oxidizing and reducing power of activated titanium dioxide despite the fact that the substrate is a metal substrate. Therefore, the metal substrate does not corrode.

According to the method for producing a purifying functional material described in claim 4, a purifying functional material having a high purifying function for waste liquid can be produced very inexpensively and easily. Further, it is possible to manufacture a purifying functional material in which titanium dioxide fine particles are very strongly adhered to the metal sprayed layer.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an aluminum plate on which a sprayed layer to which titanium dioxide is adhered is laminated.

FIG. 2 is an explanatory view showing a waste liquid purifying apparatus.

FIG. 3 is a table showing evaluation results of a degree of purification.

FIG. 4 is an explanatory view showing a modified example of a septic tank (a is a plan view, and b is a partial cross-sectional view as viewed from a lateral direction).

[Explanation of symbols]

1. Aluminum plate (substrate), 2. Sprayed layer, 3.
Titanium dioxide, 4 ... septic tank, 5 ... black light,
6. Pipe, 7. Pump, 8. Waste tank, 9.
・ Waste liquid purification device, 10 ・ ・ Purification function material, 11 ・ ・ Shaft, 12a, 12b ・ ・ Gear, 13 ・ ・ Motor, 14
・ ・ Purification wings.

Continued on the front page F term (reference) 4D037 AA11 AB02 AB06 BA18 CA12 4D050 AA12 AB01 BB01 BC06 BC09 4G069 AA01 AA08 AA15 BA04A BA04B BA17 BA18 BA48A BB02A BB02B BC16A BC16B CA05 DA05 EA11 EB18 EB30 FB18 FB18 FB18 FB18 FB18

Claims (4)

[Claims] 1. A purifying functional material characterized in that a sprayed layer having titanium dioxide fine particles adhered is laminated on a surface of a substrate made of an inorganic material or a metal. 2. A purifying tank provided with a purifying functional material in which a sprayed layer to which titanium dioxide fine particles are adhered is laminated on a surface of a substrate made of an inorganic material or a metal, and a UV irradiation lamp for irradiating the purifying tank with UV. A waste liquid purifying device, comprising: 3. The apparatus according to claim 2, wherein the substrate is a metal substrate made of stainless steel or aluminum, and the sprayed layer is a metal layer made of copper. 4. A method comprising spraying a metal or ceramic on the surface of a base made of an inorganic material or a metal, applying a dispersion of titanium dioxide fine particles to the surface of the sprayed layer after spraying, and then firing the base. A method for producing a purifying functional material.