JP2007196202A - Purification method and purifier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a purification method which enables the easy achievement of the enhancement of a purifying capacity or miniaturization, and a purifier. <P>SOLUTION: The purifier 1 is equipped with a light source 18 for irradiating a photocatalyst with light in air, a purifying body 17 to which the photocatalyst is fixed and a contact and separation means 19 for bringing the purifying body 17 into contact with a stationary or flowing liquid L to be purified and separating the same from the stationary or flowing liquid L to be purified. In the purification method, the photocatalyst is brought into contact with the stationary or flowing liquid L to be purified under irradiation with light in air. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a purification method and a purification device suitable for purifying water such as drinking water, middle water, sewage, and factory effluent.

  Conventionally, it is known to purify water such as drinking water, middle water, sewage, and factory wastewater using a photocatalyst.

  As such a purification device using a photocatalyst, a first medium having a photocatalyst layer formed on the surface and a second medium which is disposed downstream of the first medium and does not form a photocatalyst on the surface are provided. , A configuration is proposed in which light having a wavelength band substantially equal to the absorption wavelength band of the photocatalyst is irradiated to the first medium, and light having a wavelength in the ultraviolet region is irradiated from the vicinity of the second medium (for example, Patent Document 1).

  In addition, as another purification device, a configuration is proposed in which a filter blade having a photocatalytic surface is disposed in the flow path of the liquid to be purified, and the photocatalytic surface is irradiated with ultraviolet rays through the liquid to be purified (for example, a patent) Reference 2).

  Furthermore, as another purification device, a configuration in which ball-shaped ceramics or the like is coated or mixed with a photocatalyst and irradiated with ultraviolet rays in water has been proposed.

JP 2001-334263 A JP 2001-293072 A

  By the way, in recent years, higher performance has been demanded, and as one of the higher performance of various devices, purification performance is also required to be improved and miniaturized. There is also a need for a device that can be significantly reduced in size and can be reduced in cost as compared with a conventional device having the same ability.

  The present invention has been made in view of this point, and an object of the present invention is to provide a purification method and a purification device that can easily improve purification performance and downsize.

  In order to achieve the above-described object, the purification method according to the present invention is characterized in that the photocatalyst is brought into contact with or separated from the purification target liquid that is stationary or flowing in a state where light is irradiated in the air. In the purification method according to the present invention, the light is preferably ultraviolet light, and the photocatalyst is preferably fixed to the purification body, and the purification body is preferably formed in a granular shape as a whole. .

  The purification device according to the present invention is characterized in that, in a purification device for purifying a liquid to be purified with a photocatalyst, a light source for irradiating the photocatalyst with light in the air, a purification body on which the photocatalyst is fixed, and the purification And a contact / separation means for contacting / separating the body with the liquid to be purified which is stationary or flowing. In the purification apparatus according to the present invention, it is preferable that the light source is an ultraviolet lamp capable of irradiating light having a wavelength in an ultraviolet region, and the purification body is formed in a granular shape, and a plurality of the granular purification bodies are provided. Is contained in a container, and the container is preferably formed so that the liquid to be purified flows freely inside and outside, and further, the container containing the plurality of purification bodies floats on the liquid to be purified. Preferably, the plurality of purification bodies are arranged on the surface of the buoyancy body, and the light source and the purification body are disposed inside the case body capable of storing the liquid to be purified. It is preferable that it is disposed.

  According to the purification method and the purification apparatus according to the present invention, the photocatalyst is brought into contact with or separated from the purification target liquid that is stationary or flowing in a state where light is irradiated in the air, thereby exhibiting the photoexcited hydrophilic property of the photocatalyst, A uniform thin film of the liquid to be purified can be formed on the surface of the photocatalyst taken out. Since the photocatalyst can be irradiated with ultraviolet rays through the liquid to be purified which is a thin film in the air, an excellent effect such as the ability to sufficiently exhibit the oxidizing action of the photocatalyst is achieved.

  Moreover, according to the purification apparatus of this invention, there exists an outstanding effect that the purification method concerning this invention can be implemented reliably and easily.

  Therefore, according to the purification method and the purification apparatus of the present embodiment, there are extremely excellent effects such as the improvement of the purification performance and the high performance due to the miniaturization and the like.

  The present invention will be described below with reference to embodiments shown in the drawings.

  FIG. 1 is a schematic view showing a main part of an embodiment of a purification apparatus according to the present invention.

  As shown in FIG. 1, the purification device 1 according to the present embodiment includes a case body 2 having a light shielding property, which is formed of stainless steel, iron, resin, or the like in a box shape as a whole. Inside the case body 2, a horizontally extending mounting shaft 3 is rotatably arranged by a bearing (not shown) provided with a sealing device. Both ends of the attachment shaft 3 protrude from the left and right side plates 2L, 2R of the case body 2, and a rotor 4 having a plurality of blades is attached to the right end portion.

  A bottomed cylindrical left lid member 5 that covers the left end portion of the mounting shaft 3 is attached to the outer surface of the left side plate 2L of the case body 2, and is attached to the outer surface of the right side plates 2L, 2R of the case body 2. Is attached with a bottomed cylindrical right lid member 6 covering the left end of the mounting shaft 3. A supply hole 7 is formed in the upper part of the outer peripheral surface of the right lid member 6, and a connection hole 8 is formed in the lower part of the outer peripheral surface. And it is formed so that the blade | wing of the rotor 4 may be located under the supply hole 7. FIG. Further, one end of a supply pipe 9 disposed outside the case body 2 is connected to the supply hole 7, and a pump 10 for pumping up the purification target liquid L is connected to the other end of the supply pipe 9. Has been. Furthermore, one end of a connecting pipe 11 is connected to the connecting hole 8, and the other end of the connecting pipe 11 is connected to an introduction hole 12 formed on the bottom side of the right side plate 2 </ b> R of the case body 2. .

  Therefore, the purification target liquid L pumped up by the pump 10 passes through the supply pipe 9 and flows from the supply hole 7 of the right lid member 6 to the inside of the right lid member 6, and thereafter, the connection hole 8, the connection pipe 11 and It passes through the introduction hole 12 in this order and is supplied into the case body 2. Further, when the purification target liquid L passes through the inside of the right lid member 6, it contacts the blades of the rotor 4 that acts like a water wheel while flowing down from the supply hole 7, and rotates the attachment shaft 3 together with the rotor 4. It is formed so that it can be driven. That is, the pump 10 has two types of functions: a supply system drive source for supplying the purification target liquid L into the case body 2 and a drive source for rotationally driving the mounting shaft 3.

  On the bottom side of the left side plate 2L of the case body 2, there is formed a discharge hole 13 used when discharging the liquid L to be purified inside the case body 2 to the outside. One end of a discharge pipe 14 disposed outside the case body 2 is connected to the discharge hole 13, and a valve 15 that is normally closed is connected to the discharge pipe 14. .

  In addition, as the case body 2, it is good also as a sealed shape with the lid | cover which can be attached or detached, or it is good also as a box shape with an open top. An actuator such as a motor may be used as a drive source for rotationally driving the attachment shaft 3. In this case, the mounting shaft 3 can be driven at a low speed by adopting a configuration in which the driving force is transmitted to the mounting shaft 3 via the speed reducer. Note that the rotational speed of the mounting shaft 3 can be controlled by using an actuator as the drive source.

  A plurality of, in the present embodiment, four containers 16 are mounted on the mounting shaft 3 at a predetermined interval. Inside these containers 16, a purifier 17 having a photocatalyst fixed is housed. Yes.

  The container 16 of this embodiment is formed in a disk shape having a diameter of about 120 mm as a whole by knitting a wire in a mesh shape or a lattice shape, and a purifier 17 formed in a plurality of particles inside each container 16. Are arranged and fixed so as to form an annular shape. In addition, each of the four containers 16 attached to the attachment shaft 3 is attached to the attachment shaft 3, that is, a purification target in which the lower portion (about 2/5 of the diameter) from the rotation center is supplied to the inside of the case body 2. It arrange | positions so that it may immerse under the liquid level of the liquid L. FIG.

  The container 16 may be any liquid as long as the liquid L to be purified can flow freely inside and outside, but the surface to be irradiated with light from a light source to be described later is not shielded as much as possible from the purification body 17 housed inside. It is important to form.

  The shape of the container 16 can be selected from various shapes such as a flat plate shape, a cylindrical shape, and a double cylindrical shape as a whole. Furthermore, as a material of the container 16, a metal, resin, fiber, etc. can be used individually or in combination of 2 or more types. Further, the purification body 17 is not fixed inside the container 16 but is partitioned by providing a plurality of partitions inside the container 16, and a predetermined number of the purification bodies 17 are stored in each of the partitioned portions. It is good. Further, the container 16 may be configured such that the purifier 17 can be easily attached and detached by providing a lid that can be opened and closed. Further, the container 16 may be transparent or translucent with light transmission.

  Examples of the purification body 17 include ceramics, metals, resins, etc., which are provided with a photocatalyst layer on the surface of a support formed by combining two or more of them alone, a photocatalyst powder, clay, Examples thereof include those obtained by combining various inorganic materials such as silica and alumina, metal powders, etc., alone or in combination of two or more thereof and mixing and firing, and those obtained by fixing a photocatalyst to fibers.

  That is, as the purifying body 17, a material formed in a granular form by a material (cloth, resin, metal, etc.) mixed or adhered with a photocatalyst by spraying, baking, spraying, painting, dipping, or the like is used. it can.

  The shape of the particles of the purifier 17 is not limited to a spherical shape, and various shapes such as various granular shapes such as a rice granular shape and a flake shape can be used.

  The purifying body 17 is not limited to the form used by being housed in the container 16, and the container 16 itself is configured to have various shapes such as a disc shape, a flat plate shape, a cylindrical shape, and a double cylindrical shape by the purifying body 17. May be. In this case, the purification body 17 may be directly attached to the attachment shaft 3.

  However, since the size occupied by the purification body 17 as a whole when the plurality of granular purification bodies 17 are configured to be accommodated in the container 16 can be made smaller than the size of the purification body 17 as an integrated product. The structure which accommodates the several granular purification body 17 in the container 16 is preferable in the meaning that size reduction of the body 17 and by extension, an apparatus can be achieved easily. In the case where the purifier 17 is housed in the container 16, a photocatalyst layer may be provided on the surface of the container 16.

  That is, as the form of the purifying body 17, the granular purifying body 17 is housed and fixed in a square frame-like reticulated container 16 so as to form a flat plate as a whole, or the granular purifying body 17 is It is arranged on the outer peripheral surface of the pipe and fixed with a net to form a cylindrical shape as a whole, the purification body 17 itself formed into a disk shape, or the purification body without using the container 16 Various forms can be used, such as those in which 17 itself is formed in a cylindrical shape.

  As the photocatalyst, there are titanium oxide, specifically, rutile type, anatase type and brookite type in crystal form, and anatase type titanium dioxide is generally used. Of course, it can be selected and used from various conventionally known photocatalysts, but it is important to have a photocatalytic oxidation action and a photoexcited hydrophilic action.

  As the purification body 17 of the present embodiment, a product formed by mixing titanium dioxide and / or titanium dioxide compound powder and ceramic powder into a spherical shape with a diameter of about 5 mm is used. That is, the photocatalyst is fixed to the purification body 17 and the purification body 17 is formed in a granular shape as a whole. A plurality of such purifiers 17, in this embodiment, 450 particles are housed and fixed in a container 16 having a diameter of about 120 mm in a state of being arranged in a plane annular shape.

  A total of five places between the four containers 16 and outside in the arrangement direction are irradiated with light having a wavelength in the ultraviolet region as a light source for irradiating light necessary for causing the photocatalyst to undergo a photocatalytic oxidation reaction. A flexible ultraviolet lamp 18 is provided. As the ultraviolet lamp of the present embodiment, a germicidal lamp that has a high bactericidal property and can irradiate ultraviolet rays having a wavelength of 253.7 nm is used. These ultraviolet lamps 18 are disposed above the liquid surface of the purification target liquid L inside the case body 2, that is, in air having oxygen.

  The arrangement of the ultraviolet lamp 18 may be any position where the photocatalyst can be irradiated with light in the air, and may be set according to the shape of the purifier 17 or the like. For example, the ultraviolet lamps 18 may be arranged in a double row in the up and down and / or left and right directions in FIG. 1, and when the purifying body 17 is a single cylindrical member, it may be disposed inside and / or outside the purifying body 17. One or a plurality of them can be arranged. However, it is preferable that the distance between the ultraviolet lamp 18 and the purification body 17 be as short as possible in the sense that the sterilizing power of the liquid L to be purified by ultraviolet rays can be increased without increasing the output of ultraviolet rays. The shape of the ultraviolet lamp 18 can be selected from various shapes such as a straight tube shape and an annular shape.

  The light source supplies light energy that causes charge separation in the photocatalyst, and visible light and / or ultraviolet light can be used, but at least using ultraviolet light can reduce the sterilizing power of the liquid L to be purified. It is preferable in the sense that it can be obtained. As visible light, white light or sunlight can be used. Moreover, when using sunlight, it is good to make the upper part of the case body 2 into an opening, or to form with a transparent raw material with a high transmittance | permeability of an ultraviolet-ray.

  The attachment shaft 3, the rotor 4 and the container 16 constitute contact / separation means 19 for contacting / separating the purification body 17 to which the photocatalyst of the present embodiment is fixed with the liquid L to be purified which is stationary or flowing.

  The contact / separation means 19 can be changed depending on the shape of the purifier 17 and the presence / absence of the container 16. For example, in the case of the purification body 17 in a state of being stored in the container 16 or as a single disk, the purification body 17 is rotated in a state in which a part of the purification body 17 is submerged under the liquid surface of the purification target liquid L as in this embodiment. In the case of the purifying body 17 that is configured to be accommodated, stored in the container 16 or formed as a single plate, the purifying body 17 is placed in a preset posture such as a horizontal state, a vertical state, or an inclined state by a parallel crank mechanism or the like. The structure etc. which move between the liquid level and under the liquid level in the state hold | maintained can be mentioned. In this case, the purifier 17 may be moved between the liquid level and the liquid level while being swung.

  The purification target liquid L includes not only drinking water, middle water, sewage, and factory effluent, but also cooling water for cooling towers, large water tanks, ornamental ponds, swimming pools, baths that are kept at a constant temperature, hot springs, etc. ) And other liquids.

  Moreover, what is necessary is just to set as the size of the purification apparatus 1 as needed, such as an apparatus specification and a design concept.

  Next, the operation of the present embodiment having the above-described configuration will be described together with the embodiment of the purification method of the present invention.

  The purification method of this embodiment is implemented using the purification apparatus 1 of this embodiment shown in FIG.

  When the purification method of the present embodiment is started, first, the pump 10 and the ultraviolet lamp 18 are driven. Then, the purification target liquid L is pumped up by driving the pump 10. Further, the photocatalyst of the purifying body 17 is exposed to ultraviolet rays having a wavelength of 253.7 nm in the air by driving the ultraviolet lamp 18.

  When the purification target liquid L pumped up by the pump 10 passes through the supply pipe 9 and reaches the supply hole 7 of the right lid member 6, it flows down from the supply hole 7 into the right lid member 6.

  At this time, the purification target liquid L comes into contact with the blades of the rotor 4 while flowing down from the supply hole 7, and rotates the attachment shaft 3 together with the rotor 4. As a result, the container 16 containing the purification body 17 starts rotating together with the mounting shaft 3.

  Subsequently, the purification target liquid L flowing down from the supply hole 7 gathers at the connection hole 8, passes through the connection pipe and the introduction hole 12 in this order, and is supplied into the case body 2.

  Next, as the liquid level of the purification target liquid L supplied into the case body 2 rises, the lower portion of the rotating container 16 is submerged below the level of the purification target liquid L. As a result, the purification body 17 comes into contact with the purification target liquid L, and the purification target liquid L adhering to the purification body 17 is sequentially pulled up into the air together with the purification body 17.

  At this time, the photocatalyst exposed to the surface in the air by being irradiated with ultraviolet rays exhibits photoexcited hydrophilicity, so that the purifier is taken out into the air after being submerged under the surface of the liquid L to be purified. On the surface of 17, water droplets of the purification target liquid L due to the surface tension of the purification target liquid L are not formed, but a uniform thin film of the purification target liquid L is formed by the photoexcited hydrophilicity of the photocatalyst.

  Next, the purification target liquid L formed as a uniform thin film on the surface of the purifying body 17 is oxidized in the air by the photocatalyst irradiated with ultraviolet rays from the ultraviolet lamp 18 and sterilized by ultraviolet rays from the ultraviolet lamp 18. As a result, purification such as decomposition of the decomposition target contained in the thin liquid to be purified L and sterilization of microorganisms are sequentially performed on the surface of the purification body 17 moving in the atmosphere.

  At this time, since the purification target liquid L is a thin film, the ultraviolet rays easily pass through the purification target liquid L and reach the photocatalyst. As a result, both the oxidation action by the photocatalyst and the bactericidal action by the ultraviolet rays can be sufficiently exhibited.

  On the other hand, in the case of the configuration in which the purification target liquid L is caused to flow on the surface of the photocatalyst or the purification body 17 in which the photocatalyst is fixed is installed in the purification target liquid L, the layer of the purification target liquid L Since the thickness of the (film) is increased, the ultraviolet light is absorbed and attenuated by the liquid L to be purified, so that the ultraviolet light does not reach the photocatalyst sufficiently, and the performance of the photocatalyst cannot be fully exhibited. Bactericidal properties are also reduced.

  That is, the thinner the membrane pressure of the liquid L to be contacted with the photocatalyst, the easier it is for ultraviolet rays to pass through, so that both the oxidizing action by the photocatalyst and the bactericidal property by the ultraviolet rays can be fully exhibited.

  As the film pressure of the liquid L to be purified brought into contact with the photocatalyst is thinner, the oxidation action by the photocatalyst is larger. An aqueous solution of methylene blue as a redox reagent (10 mg / liter of distilled water = 10 ppm: Photocatalyst Product Technical Council, Photocatalyst Using the performance evaluation test method I (2001 version)), the relationship between the depth from the liquid surface of the photocatalyst, the time, and the concentration of methylene blue could be confirmed. The result of this experiment is shown in FIG. As an experiment, the purifiers 17 of the present embodiment are arranged on the bottom surface of the graduated cylinder, methylene blue is injected at a predetermined water depth (40 mm, 70 mm, 210 mm), and a germicidal lamp ( It was obtained by measuring the concentration of methylene blue every time a predetermined time (3 hours, 8 hours, 14 hours, 18 hours, 24 hours) passed with a wavelength of 253.7 nm (output: 1.66 W) turned on. And as shown in FIG. 2, it was able to confirm by experiment that the oxidation action by a photocatalyst decreases as the membrane pressure of the purification target liquid L increases.

  Subsequently, the thin film-like purification target liquid L purified on the surface of the purification body 17 moving in the atmosphere is immersed in the liquid together with the purification body 17 as the container 16 rotates, so that the liquid L of the case body 2 is immersed in the liquid. The purification target liquid L that has been sequentially returned and supplied to the case body 2 is purified. The purified liquid L to be purified is discharged by opening the valve 15 disposed in the middle of the discharge pipe 14.

  It should be noted that the purification target liquid L can be purified in either a state where the purification target liquid L is stationary or fluidized in the case body 2. In this case, the purification target liquid L can be made to stand still or flow in a state where the preset position of the liquid level is maintained by opening the valve 15 or turning the valve 15 on and off. When the purification target liquid L is made stationary, it is necessary to stop the pump 10 from pumping the purification target liquid L, and thus the attachment shaft 3 cannot be rotated. It is preferable that an actuator such as a motor and a driving force transmission mechanism such as a gear or a belt for transmitting the driving force of the actuator to the mounting shaft 3 are provided.

  Further, in the purification device 1 of the present embodiment, the concentration of 10 ppm of methylene blue can be reduced to 4.6 ppm after 1 hour, and the methylene blue can be almost completely oxidized to 0.05 ppm after 8 hours. It was confirmed by experiment.

  Moreover, when the purification body 17 was arrange | positioned in the water depth of 60 mm, it has confirmed that the density | concentration of 10 ppm of methylene blue was set to 9.1 ppm after 1 hour passage, and 5.9 ppm after 8 hours passage. That is, even in this experiment, it was confirmed that when the photocatalyst was submerged in the liquid, the oxidizing action by the photocatalyst could not be exhibited sufficiently.

  When ultraviolet rays having a wavelength of 360 nm were used as the light source, it was confirmed that the concentration of methylene blue was 8.6 ppm after 1 hour and 3.8 ppm after 8 hours under the same conditions. That is, it was confirmed that the oxidation action by the photocatalyst can be exhibited more effectively and efficiently by setting the wavelength of the ultraviolet ray irradiated to the photocatalyst to 253.7 nm. The results of these experiments are shown in FIG. Of course, when a ball body having no photocatalyst having the same size and shape as the purification body 17 was used, it was confirmed that the concentration of methylene blue did not change even after 8 hours.

  Thus, in the purification method of the present embodiment, the granular purification body 17 with the photocatalyst fixed in the air is irradiated with ultraviolet rays, and then the granular purification body 17 is submerged below the surface of the purification target liquid L. After that, the purification body 17 submerged in the purification target liquid L is taken out into the air, and the operation of irradiating the purification body 17 with ultraviolet rays in the air is repeated in this order so that the purification target liquid L can be purified. Has been.

  That is, according to the purification method of the present embodiment, the photocatalyst can be brought into contact with and separated from the purification target liquid L that is stationary or flowing while being irradiated with light in the air, so that the photoexcited hydrophilicity of the photocatalyst is exhibited. A uniform thin film of the purification target liquid L can be formed on the surface of the photocatalyst taken out into the air. And since an ultraviolet-ray can be irradiated to a photocatalyst through the purification object liquid L made into the thin film in the air, the oxidizing action of a photocatalyst can fully be exhibited.

  Further, according to the purification method of the present embodiment, since the light is ultraviolet rays, the ultraviolet light is sterilized in addition to the oxidizing action by the photocatalyst by irradiating the purification target liquid L which is a thin film in the air with ultraviolet rays. The bactericidal action by can be sufficiently exhibited. In particular, greater sterilizing power can be obtained by using ultraviolet rays having a wavelength of 253.7 nm. That is, by irradiating the photocatalyst with ultraviolet rays through the purification target liquid L formed into a thin film in the air, both the oxidizing action by the photocatalyst and the sterilizing action by the ultraviolet rays can be sufficiently exhibited.

  Moreover, according to the purification method of this embodiment, since the photocatalyst is fixed to the purification body 17 and the purification body 17 is formed in a granular shape as a whole, the purification body 17 is integrated with a flat plate. Compared with the case where it does, it can enlarge the contact area as a whole easily. That is, comparing the case where the installation space of the purification target liquid L in the case where the purification body 17 is integrated with the case where the installation space as a whole in the case of a plurality of granules is the same, it is better to have a plurality of granules. The contact area with the liquid L to be purified can be increased. In other words, when the contact area with the purification target liquid L in the case where the purification body 17 is integrated and the contact area with the purification target liquid L as a whole in the case of a plurality of particles are compared, A plurality of granular shapes can reduce the installation space of the purification body 17. As a result, it is possible to easily reduce the size.

  Furthermore, according to the purification method of the present embodiment, the purification target liquid L that is a thin film in the air is irradiated with ultraviolet rays, so that the purification rate can be increased. That is, in the purification method of the present embodiment, since the purification target liquid L is a thin film, the amount of purification per unit time is reduced, but since purification can be performed at high speed, the overall purification power and purification capability are high. Can be. On the other hand, when the film thickness of the purification target liquid L is increased as in the past, the purification amount per unit time is increased, but the purification power itself is reduced, or the time required for purification is extremely long. As a result, the purification power and the purification capacity are low.

  In addition, since the bactericidal action by ultraviolet rays having a wavelength of 253.7 nm in the present embodiment is conventionally known, detailed description thereof will be omitted. Moreover, the dead body and organic substance of the bacteria sterilized by the photocatalyst and the germicidal lamp can be decomposed and purified by the photocatalyst.

  Therefore, according to the purification method of the present embodiment, the purification performance of the purification target liquid L can be easily and reliably improved.

  Further, according to the purification device 1 of the present embodiment, a light source for irradiating the photocatalyst with light in the air, a purification body 17 on which the photocatalyst is fixed, and a purification target liquid that is stationary or flowing. And the contact / separation means for contacting / separating with L, the purification method of the present invention, that is, the purification method for contacting / separating the photocatalyst with the liquid to be purified L that is stationary or flowing while being irradiated with light in the air. Can be easily implemented with a simple configuration.

  Further, according to the purification device 1 of the present embodiment, the ultraviolet light 18 that can irradiate light having a wavelength of at least the ultraviolet region is used as the light source, so that the purification target liquid L can be sterilized easily and reliably. Can do. That is, since it is possible to irradiate the photocatalyst with ultraviolet rays through the purification target liquid L formed into a thin film in the air, both the oxidizing action by the photocatalyst and the sterilizing action by the ultraviolet rays can be sufficiently exhibited. At this time, the sterilization performance can be further improved by using a sterilization lamp that emits ultraviolet rays having a wavelength of 253.7 nm as the ultraviolet lamp 18.

  Furthermore, according to the purification apparatus 1 of the present embodiment, the purification body 17 is formed in a granular shape, and the plurality of purification bodies 17 are stored in the container 16 in which the purification target liquid L can flow freely inside and outside. The arrangement space of the purification body 17 can be reduced. That is, when the contact area with the purification target liquid L in the case where the purification body 17 is integrated and the contact area with the purification target liquid L as a whole in the case of a plurality of particles are compared, The installation space of the purification body 17 can be reduced by using the granular shape. In other words, comparing the case where the installation space of the purification target liquid L in the case where the purification body 17 is integrated with the case where the entire installation space in the case where the purification body 17 is made into a plurality of particles is the same, However, the contact area with the purification target liquid L can be increased. As a result, it is possible to easily reduce the size.

  Furthermore, according to the purification device 1 of the present embodiment, the light source and the purification body 17 are disposed inside the case body 2 in which the purification target liquid L can be stored. It can be easily set in a fluid state, and can be easily installed in a wide variety of installation locations.

  Therefore, according to the purification method and the purification apparatus 1 of the present embodiment, there are extremely excellent effects such as improvement of the purification performance and high performance due to downsizing and the like.

  Furthermore, according to the purification method and the purification device 1 of the present embodiment, the size can be significantly reduced as compared with the conventional device having the same ability, and the cost can be reduced.

  Moreover, according to the purification apparatus 1 of the present embodiment, there are extremely excellent effects such as that the purification method of the present embodiment can be reliably and easily performed.

  4 and 5 show a second embodiment of the purification apparatus according to the present invention, FIG. 4 is a schematic view showing the main part, and FIG. 5 is a side view of FIG.

  The purification apparatus A of the present embodiment exemplifies an apparatus in which the purification body 17 is accommodated in one container 16A.

  That is, in the purification apparatus 1A of the present embodiment, as shown in FIGS. 4 and 5, a pipe 21 having a nominal diameter of 50A (outer diameter of 60.5 mm) and a length of 50 mm, and both ends of the inner hole of the pipe 21 are provided. A cylindrical container 16 </ b> A as a whole is formed by a pair of left and right journals 22 attached and a wire mesh 23 attached to the outer peripheral surface of the pipe 21. And the same number of purification bodies 17 as the number accommodated in the four containers 16 in the purification apparatus 1 of 1st Embodiment mentioned above are arranged on the outer peripheral surface of the pipe 21, These purification bodies 17 are the wire mesh 23. It is fixed to the surface of the pipe 21. Both journals 22 are rotatably supported by the left and right side plates 2L, 2R of the case body 2 shown in FIG. That is, both journals 22 serve as a substitute for the mounting shaft 3 shown in FIG. It should be noted that maintenance such as replacement of the purifier 17 can be performed by removing the wire mesh 23.

  In the air outside the container 16A, as shown in FIG. 5, a plurality of, in the present embodiment, two ultraviolet lamps 18 formed in a straight tube form the axial direction of the pipe 21 around the container 16A. They are arranged so as to extend parallel to the concentric circles in parallel with the axial direction.

  In the purification apparatus 1A of the present embodiment, an actuator such as an electric motor may be used alone or in combination with a speed reducer as a drive source for rotationally driving the container 16A. Of course, you may comprise so that the rotational speed of the container 16A may be controlled.

  Since other configurations are the same as those of the purification device 1 of the first embodiment described above, detailed description thereof is omitted.

  According to the purification device 1A of the present embodiment having such a configuration, the same effects as those of the purification device 1 of the first embodiment described above can be achieved.

  Further, according to the purification device 1A of the present embodiment, the production of the container 16A containing the purification body 17 is simpler than the case where the four containers 16 containing the purification body 17 in the first embodiment are used. Maintenance can be easily performed, and a plurality of ultraviolet lamps 18 can be arranged on the outside of one container 16A, so that the overall size of the apparatus can be further reduced. As a result, the overall cost can be further reduced.

  According to the purification apparatus 1A of the present embodiment, since the purification body 17 is disposed on the outer peripheral surface of the pipe 21, all the purification bodies 17 can be brought into contact with the purification target liquid L by the rotation of the container 16A. it can.

  Further, according to the purification device 1A of the present embodiment, evaporation of the purification target liquid L can be reduced as compared with the purification device 1 of the first embodiment described above.

  FIG. 6 is a schematic view showing a main part of a third embodiment of the purification apparatus according to the present invention.

  The purification device 1B of the present embodiment is configured to float the container 16B containing the purification body 17 on the purification target liquid L.

  That is, in the purification apparatus 1B of the present embodiment, as shown in FIG. 6, a spherical container 16B as a whole is formed by a buoyant body 31 formed in a ball shape and a wire mesh 23B disposed on the outer peripheral surface of the buoyant body 31. Is formed. And the same number of purification bodies 17 as the number accommodated in the four containers 16 in the purification apparatus 1 of 1st Embodiment mentioned above are arrange | positioned on the surface of the buoyancy body 31, and these purification bodies 17 are arrange | positioned by the metal net 23B. It is fixed to the surface of the buoyancy body 31.

  Therefore, in the present embodiment, the container 16B containing the plurality of purification bodies 17 is formed so as to float on the purification target liquid L, and the entire buoyancy of the container 16B containing the plurality of purification bodies 17 is buoyancy body. 31 is secured. The number of containers 16B may be plural. Further, by removing the wire mesh 23B, maintenance such as replacement of the purifier 17 can be performed.

  The buoyancy of the buoyancy body 31 is preferably controlled so that about 1/3 to 2/3 of the container 16B is submerged in the purification solution L.

  The buoyancy body 31 is formed so as to obtain a desired buoyancy with a material having a specific gravity smaller than that of the liquid L to be purified, or formed so as to obtain a desired buoyancy by forming a void therein. Examples of suitable buoyancy enhancing means in the station include those in which buoyancy is increased by enclosing air or oil, and those formed by foam.

  The shape of the buoyant body 31 is not limited to a spherical shape, and can be selected from a cylindrical shape, an ellipsoidal shape such as a rugby ball, a polygonal columnar shape, and a polyhedral shape. Further, the buoyancy body 31 can be hollow or solid. Further, it may be cylindrical. The overall shape of the container 16B is regulated by the shape of the buoyancy body 31.

  One end of the supply pipe 9B is directly connected to the introduction hole 12 of the right side plate 2BR of the case body 2B in the purification device 1B of the present embodiment. A circulation pump 32 is disposed inside the case body 2B. The circulation pump 32 is connected to the proximal end portion of the circulation pipe 33, and the distal end 33 a of the circulation pipe 33 is disposed above the liquid surface of the purification target liquid L. The tip 33a of the circulation pipe 33 faces the bottom surface of the case body 2B so that the purification target liquid L pumped up by the circulation pump 32 can be discharged or ejected toward the liquid surface in the case body 2B. It is preferable to configure.

  Therefore, by driving the circulation pump 32, the purification target liquid L pumped up by the circulation pump 32 flows through the circulation pipe 33 toward the tip 33a, and then from the tip 33a of the circulation pipe 33 to the case. It is formed such that it is discharged or ejected toward the liquid surface of the purification target liquid L inside the body 2B and flows down into the case body 2B. Further, the purification target liquid L discharged or ejected from the tip 33a of the circulation pipe 33 and flowing down can come into contact with the container 16B in the middle of flowing down to rotate the container 16B.

  The circulation pump 32 and the circulation pipe 33 constitute contact / separation means 19B for contacting / separating the purification body 17 to which the photocatalyst of this embodiment is fixed to / from the purification target liquid L that is stationary or flowing.

  In the purification apparatus 1B of the present embodiment, the purification target liquid L is used as a drive source for rotating the container 16B. However, other fluids such as a liquid such as water and a gas such as air can also be used.

  Moreover, it is good also considering the upper part of case body 2B as an opening similarly to the purification apparatus 1 of 1st Embodiment mentioned above. In this case, the ultraviolet lamp 18 may not be disposed inside the case body 2B, but may be disposed close to the upper portion of the opening, or one end (purification) of the supply pipe 9B may be performed without providing the introduction hole 12 in the case body 2B. The discharge end of the target liquid L) may be disposed inside the case body 2 or above the opening.

  In addition, the structure which does not store the purification body 17 in the container 16B, for example, forms the purification body 17 so that the surface of the buoyancy body 31 may be covered without making it granular, or it forms so that the surface of the buoyancy body 31 may be covered with a photocatalyst. May be. In this case, it is important to provide the surface with irregularities that serve as water flow resistance so that the liquid L can be rotated when it is applied. Such protrusions and irregularities have a function of increasing the contact area with the liquid L to be purified.

  Since other configurations are the same as those of the purification device 1 of the first embodiment described above, detailed description thereof is omitted.

  In the purification apparatus 1B of the present embodiment having such a configuration, first, the pump 10 and the ultraviolet lamp 18 are driven. Then, the purification target liquid L is pumped up by driving the pump 10. Further, the photocatalyst of the purifying body 17 is exposed to ultraviolet rays having a wavelength of 253.7 nm in the air by driving the ultraviolet lamp 18.

  Next, the purification target liquid L pumped up by driving the pump 10 passes through the supply pipe 9B and is stored in the case body 2B through the introduction hole 12. When the purification target liquid L is stored inside the case body 2B, the container 16B is submerged in the liquid surface of the purification target liquid L stored inside the case body 2B by about ½ of its diameter. Will float.

  Next, the circulation pump 32 is driven in a state where the purification target liquid L is stored in the case body 2B. When the circulation pump 32 is driven, the purification target liquid L stored in the case body 2B is discharged or ejected from the tip 33a of the circulation pipe 33 and flows down toward the liquid surface. Then, when the purification target liquid L flows down to the liquid surface, the purification target liquid L flows toward the position where the purification target liquid L flows down as indicated by an arrow C in FIG. As a result, the container 16B floating in the purification target liquid L moves to a position immediately below the flow down position of the purification target liquid L, and the position is maintained.

  At this time, the purification target liquid L flowing down to the outer periphery of the container 16B is applied, and the container 16B starts to rotate counterclockwise in FIG. 6 indicated by an arrow D in FIG. As a result, like the purification device 1 of the first embodiment described above, the purification target liquid L adhering to the purification body 17 is sequentially pulled up into the air together with the purification body 17. And the purification body 17 pulled up in the air will be immersed in the liquid L of the purification object liquid L again by the further rotation of the container 16B. As a result, after irradiating the granular purification body 17 with the photocatalyst fixed in the air with ultraviolet rays, the granular purification body 17 is submerged below the surface of the purification target liquid L and then submerged in the purification target liquid L. The purification target liquid L is purified by repeating the operation of taking out the purified body 17 in the air and irradiating the purification body 17 with ultraviolet rays in this order.

  Therefore, according to the purification device 1B of the present embodiment, the same effects as those of the purification devices 1 and 1A of the first and second embodiments described above can be obtained.

  Moreover, according to the purification apparatus 1B of this embodiment, compared with the case where the container 16 and the contacting / separating means 19 in the purification apparatus 1 of the first embodiment described above are used, the number of parts can be reduced with a simple configuration. As a result, the overall size of the apparatus can be further reduced, and the running cost can be reduced. As a result, the overall cost can be further reduced.

  It should be noted that the purification performance of the purification device 1B of the present embodiment is equivalent to the purification devices 1 and 1B of the first and second embodiments described above, so that the concentration of 10 ppm of methylene blue is 4.6 ppm after 1 hour. It was confirmed by an experiment that methylene blue can be almost oxidized by 0.05 ppm after 8 hours.

  Moreover, the container 16B in the purification apparatus 1B of this embodiment can be used alone for purification of various large tanks such as a sedimentation tank and a pool. In this case, in order to prevent the container 16B from moving in the vicinity of the inlet of the purification target liquid L, a wire net or a fence is installed so as to surround the portion where the purification target liquid L flows down, The container 16B may be disposed in the region. The ultraviolet lamp 18 may be held by a stand. Furthermore, when the purification target liquid L is always in a state where the rotation of the container 16B can be maintained by the supply or the flow of the purification target liquid L, it is not necessary to provide the contact / separation means 19B. Furthermore, when the purification target liquid L is intermittently supplied, the rotation of the container 16B can be ensured when the purification target liquid L is supplied. Purification can be performed. Even in such a case, the contact / separation means 19B is not necessarily provided.

  In addition, this invention is not limited to each said embodiment, A various change can be made as needed. For example, a purification body, a light source, and the like can be provided in the middle of the flow path of the liquid to be purified without using a case body.

The schematic diagram which shows the principal part of 1st Embodiment of the purification apparatus which implements the purification method which concerns on this invention. The figure which shows the relationship between the depth from the liquid level of the photocatalyst, the elapsed time, and the concentration of methylene blue The figure which shows the relationship between the wavelength of ultraviolet rays irradiating the photocatalyst, the elapsed time and the concentration of methylene blue The schematic diagram which shows the principal part of 2nd Embodiment of the purification apparatus which implements the purification method which concerns on this invention. Side view of FIG. The schematic diagram which shows the principal part of 3rd Embodiment of the purification apparatus which implements the purification method which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A, 1B purification apparatus 2, 2B Case body 3 Mounting shaft 4 Rotor 9, 9B Supply piping 10 Pump 11 Connection piping 14 Exhaust piping 16, 16A, 16B Container 17 Purification body 18 Ultraviolet lamp 23, 23B Wire mesh 19, 19B Contact Separation means 31 Buoyant body 32 Circulation pump 33 Circulation piping L Liquid to be purified

Claims (9)

  A purification method, wherein the photocatalyst is brought into contact with or separated from a liquid to be purified which is stationary or flowing while being irradiated with light in air.   The purification method according to claim 1, wherein the light is ultraviolet light.   The purification method according to claim 1 or 2, wherein the photocatalyst is fixed to a purification body, and the purification body is formed in a granular shape as a whole. In a purification device that purifies the liquid to be purified with a photocatalyst,
A light source for irradiating the photocatalyst with light in the air, a purifier to which the photocatalyst is fixed,
A purifying device comprising contact / separation means for contacting / separating the purifier with a liquid to be purified which is stationary or flowing.   The purification apparatus according to claim 4, wherein the light source is an ultraviolet lamp capable of irradiating light having a wavelength in the ultraviolet region.   The purifying body is formed in a granular form, a plurality of the granular purifying bodies are housed in a container, and the container is formed so that the liquid to be purified can flow in and out. The purification apparatus according to claim 4 or 5.   The purification apparatus according to claim 6, wherein a container containing the plurality of purification bodies is formed so as to float on a liquid to be purified.   The purification device according to claim 7, wherein the plurality of purification bodies are disposed on a surface of a buoyancy body. The purification device according to any one of claims 4 to 8, wherein the light source and the purification body are disposed inside a case body capable of storing a liquid to be purified.

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