JP2012232270A - Purification tank and purification system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently improve purification capacity without increasing running cost.SOLUTION: The purification system comprises a purification tank body 30 configured to be able to store drain water W, a photocatalyst filter 33 that is provided with a photocatalyst at least on the surface site thereof and is placed within the purification tank body 30, and a light source lamp 34 for irradiating the filter 33 with ultraviolet light, wherein the purification tank body 30 is configured so that the site on the lower side of the filter 33 is immersed in the stored drain water W and the filter 33 is stored such that the site on the upper side of the filter 33 is located above the stored liquid surface of the drain water W, a water guide plate 35 is provided for guiding drain water W introduced into the purification tank body 30 toward the site on the upper side of the filter 33, and the lamp 34 is located within the purification tank body 30 so that at least a part of the lamp 34 is positioned above the liquid surface of the drain water W stored in the purification tank body 30.

Description

  The present invention relates to a purification treatment tank in which a photocatalytic filter is accommodated in a treatment tank body capable of storing a liquid to be treated, and a purification treatment system configured to include such a purification treatment tank.

  For example, Japanese Patent Application Laid-Open No. 2008-246449 discloses a treatment apparatus for water containing harmful organic substance oil (hereinafter, “purification treatment apparatus”) that purifies contaminated water containing harmful substances such as polychlorinated biphenyl (PCB) oil. Is disclosed. This purification treatment apparatus includes a contaminated water tank that contains contaminated water to be treated, a photocatalytic reaction container that contains a photocatalyst and decomposes (purifies) harmful organic substances contained in the contaminated water, and a contaminated water tank. Supply pipe for supplying contaminated water from the photocatalytic reaction vessel, a recovery tank for recovering the treated water treated in the photocatalytic reaction vessel, a discharge pipe for discharging the treated water from the photocatalytic reaction vessel to the recovery tank, and a photocatalyst An ultraviolet lamp for irradiating the photocatalyst in the reaction vessel with ultraviolet rays is provided.

  When purifying contaminated water by this purification treatment apparatus, first, the contaminated water is supplied from the contaminated water tank to the photocatalytic reaction vessel via the supply pipe. Next, the photocatalyst in the photocatalytic reaction vessel is irradiated with ultraviolet rays from an ultraviolet lamp. At this time, harmful organic substances contained in the contaminated water in the photocatalytic reaction vessel are oxidatively decomposed by the photocatalytic reaction of the photocatalyst. Thereby, the contaminated water supplied in the photocatalytic reaction container is purified. Thereafter, the treated water subjected to the purification treatment is discharged from the photocatalytic reaction vessel to the recovery tank through the discharge pipe.

JP 2008-246449 A (page 4-12, FIG. 1-6)

  However, the following problems exist in the conventional purification treatment apparatus. That is, the conventional purification treatment apparatus employs a configuration in which the contaminated water is purified by a photocatalytic reaction by irradiating the photocatalyst immersed in the contaminated water in the photocatalytic reaction vessel with ultraviolet rays from an ultraviolet lamp. In this case, the contaminated water supplied into the photocatalytic reaction container has a transmittance of ultraviolet rays even if foreign matter such as dust that can be physically filtered by a filtration filter or the like has been removed and is visually transparent. It is known to be low (high absorption rate of ultraviolet rays). For this reason, in the conventional purification treatment apparatus configured to irradiate the photocatalyst immersed in the contaminated water with ultraviolet rays from the ultraviolet lamp, the ultraviolet light emitted from the ultraviolet lamp is greatly attenuated when passing through the contaminated water. It is difficult to irradiate the photocatalyst with a sufficient amount of ultraviolet rays.

  In fact, in many cases, contaminated water containing foreign matter is treated, and in such a case, as a result of the physical impediment to the transmission of ultraviolet rays by the foreign matter, there is a sufficient amount for the photocatalyst. It becomes more difficult to irradiate ultraviolet rays. Therefore, in the conventional purification treatment apparatus, it is difficult to sufficiently promote the photocatalytic reaction by irradiation with ultraviolet rays, which makes it difficult to improve the purification treatment capacity of contaminated water. . In this case, there is a possibility that a sufficient amount of ultraviolet rays capable of sufficiently promoting the photocatalytic reaction can be irradiated to the photocatalyst by disposing a high-intensity ultraviolet lamp or a plurality of ultraviolet lamps. However, when such a configuration is adopted, a large amount of electric power is required to turn on a high-intensity lamp or a plurality of lamps, resulting in a problem that the running cost of the purification processing apparatus increases. .

  The present invention has been made in view of such problems, and a main object of the present invention is to provide a purification treatment tank and a purification treatment system capable of sufficiently improving the purification treatment capacity without causing an increase in running cost. .

  In order to achieve the above object, the purification treatment tank according to claim 1 is a treatment tank main body configured to be able to store a liquid to be treated and a photocatalyst disposed at least on a surface portion thereof and accommodated in the treatment tank main body. A purification tank comprising a photocatalyst filter and a light source lamp for irradiating the photocatalyst filter with ultraviolet light, wherein the treatment tank body is immersed in a lower part of the photocatalyst filter in the stored liquid to be treated, And the said process target introduced into the said processing tank main body while being comprised so that the said photocatalyst filter can be accommodated so that the upper side part in the said photocatalyst filter may be located above the liquid level of the said stored process target liquid A guide mechanism for guiding the liquid to the upper portion of the photocatalytic filter, and the light source lamp is stored in the processing tank body. At least a portion of the light source lamp above the liquid level of the liquid is accommodated in the processing bath main body so as to be located.

  Further, a purification treatment tank according to a second aspect is the purification treatment tank according to the first aspect, further comprising a stirring mechanism for stirring the processing target liquid stored in the processing tank main body.

  Furthermore, the purification treatment tank according to claim 3 is the purification treatment tank according to claim 2, wherein the stirring mechanism supplies a gas into the stored treatment target liquid, and the treatment target liquid is supplied by the supplied gas. It is provided with a gas supply mechanism that stirs.

  The purification treatment tank according to claim 4 is the purification treatment tank according to any one of claims 1 to 3, wherein the photocatalytic filter is formed in a cylindrical shape, and the light source lamp is disposed inside the photocatalytic filter. It is arranged.

  Furthermore, the purification treatment tank according to claim 5 is the purification treatment tank according to any one of claims 1 to 4, wherein the photocatalytic filter is formed by coating the photocatalyst on an aggregate formed of a porous body. Has been.

  In addition, a purification processing system according to a sixth aspect includes the purification treatment tank according to any one of the first to fifth aspects, and is configured to purify the liquid to be treated.

  A purification treatment system according to claim 7 is the purification treatment system according to claim 6, further comprising a gas-liquid separation tank disposed upstream of the purification treatment tank, wherein gas is separated in the gas-liquid separation tank. The treated liquid to be treated is purified by the purification treatment tank.

  In the purification treatment tank according to claim 1, the lower part of the photocatalyst filter is immersed in the stored treatment target liquid, and the upper part of the photocatalyst filter is located above the liquid level of the stored treatment target liquid. The photocatalyst filter is configured to be accommodated so as to be positioned, and is configured to include a guide mechanism that guides the liquid to be processed introduced into the processing tank main body to an upper side portion of the photocatalytic filter. It is accommodated in the processing tank main body so that at least a part is located above the liquid level of the liquid to be processed stored in the body. Moreover, in the purification processing system of Claim 6, it comprises the said purification processing tank and is comprised so that a process target liquid can be purified.

  Therefore, according to the purification treatment tank according to claim 1 and the purification treatment system according to claim 6, the ultraviolet light from the light source lamp is irradiated to the photocatalyst filter without significant attenuation on the upper side in the treatment tank body. Since the liquid to be treated is guided to the upper part of the photocatalytic filter and flows through the photocatalytic filter, the photocatalytic reaction by the photocatalytic filter can be preferably caused to sufficiently purify the liquid to be treated. In addition, it is possible to irradiate the photocatalytic filter with a sufficient amount of ultraviolet light without providing a light source lamp having a high-intensity light source or a plurality of light source lamps. Cost can be reduced sufficiently. Furthermore, since the lower part of the photocatalyst filter is in a state immersed in the processing target liquid in the processing tank body, not only while the processing target liquid introduced into the processing tank body flows down through the photocatalytic filter, Even in a state where the liquid to be treated is stored in the lower part of the treatment tank body, it can be suitably purified by the photocatalytic reaction by the photocatalytic filter.

  Further, according to the purification treatment tank of the second aspect, since the agitation mechanism for agitating the processing target liquid stored in the processing tank main body is provided, ultraviolet rays are transmitted to some extent when the stored processing target liquid is transmitted. The liquid to be treated can be suitably brought into contact with the surface of the photocatalytic filter in the lower portion of the treatment tank body that is attenuated, and can be sufficiently purified by the photocatalytic reaction.

  Furthermore, according to the purification treatment tank according to claim 3, the stirring mechanism is configured by including the gas supply mechanism that stirs the processing target liquid with the gas supplied and supplied into the stored processing target liquid. Although the structure is relatively simple, the stored liquid to be treated can be suitably stirred and brought into contact with the photocatalytic filter. Further, since the liquid to be treated can be agitated without disposing a movable mechanism part in a portion that is submerged in the stored liquid to be treated, the purification treatment tank (purification treatment system) can be performed without complicated maintenance work. The purification treatment capacity can be maintained over a long period of time.

  According to the purification treatment tank of claim 4, the photocatalytic filter is formed in a cylindrical shape, and the light source lamp is disposed inside the photocatalytic filter, so that the ultraviolet light from the light source lamp is efficiently generated with respect to the photocatalytic filter. Since it can irradiate well and uniformly, a photocatalytic reaction can be suitably generated in each part of the photocatalytic filter.

  Furthermore, according to the purification treatment tank of claim 5, since the photocatalyst filter is formed by coating the aggregate formed of the porous body with the photocatalyst, the surface area of the photocatalyst can be sufficiently expanded. In addition to being able to irradiate the photocatalyst with ultraviolet light more efficiently, the liquid to be treated can be efficiently brought into contact with the photocatalyst. Further, it can be made lighter than a photocatalytic filter in which a solid aggregate is coated with a photocatalyst.

  Further, according to the purification processing system according to claim 7, the gas-liquid separation tank disposed upstream of the purification processing tank is provided, and the treatment target liquid from which the gas is separated in the gas-liquid separation tank is purified. By purifying the liquid, it is possible to float and separate large oil droplets before they are introduced into the purification treatment tank, so that the liquid to be treated is more suitably purified without causing a clogging of the photocatalytic filter. be able to.

It is a lineblock diagram showing the composition of purification processing system 1 concerning an embodiment of the invention. It is sectional drawing which shows the structure of the 1st processing tank 3a (2nd processing tank 3b) in the purification processing system 1 which concerns on embodiment of this invention. It is sectional drawing which shows the structure of the processing tank 5 in the purification processing system 1A which concerns on other embodiment of this invention. It is sectional drawing which shows the structure of the processing tank 6 in the purification processing system 1B which concerns on other embodiment of this invention. It is sectional drawing which shows the structure of the processing tank 7 in the purification processing system 1C which concerns on other embodiment of this invention.

  Hereinafter, embodiments of a purification treatment tank and a purification treatment system according to the present invention will be described with reference to the accompanying drawings.

  The purifying treatment system 1 shown in FIG. 1 is intended for drain water W (drain water W contaminated with oil etc.) drained from a “drain water generation source” such as an air compressor or a compressed air dehumidifier. The purification system is configured to be capable of performing the purification process, and includes a gas-liquid separation tank 2, a first processing tank 3a, a second processing tank 3b, and an air pump 4. In this case, in the purification processing system 1 of this example, the gas-liquid separation tank 2 is connected to a drain water generation source via a connection pipe (not shown). Further, in this purification treatment system 1, the gas-liquid separation tank 2 and the first treatment tank 3a are connected to each other by the water supply pipe 11, and the first treatment tank 3a and the second treatment tank 3b are connected by the water supply pipe 12. The second treatment tank 3 b is connected to each other and to a drainage groove (not shown) (or a tank for storing the treated drain water W) via the drainage pipe 13.

  The water supply pipes 11 and 12 and the drainage pipe 13 are provided with open air ports 11a, 12a, and 13a, respectively, so that the inside of the drain water W described later has a substantially atmospheric pressure. Further, in the purification processing system 1, the first processing tank 3a is disposed at a slightly lower position than the gas-liquid separation tank 2, and the second processing tank 3b is slightly lower than the first processing tank 3a. Placed in position. Thereby, in this purification processing system 1, the drain water W naturally flows from the gas-liquid separation tank 2 to the first processing tank 3a as described later without requiring power for feeding the drain water W. The drain water W is sent from the first treatment tank 3a to the second treatment tank 3b by natural flow, and the drain water W is drained from the second treatment tank 3b to the drain by natural flow.

  The gas-liquid separation tank 2 separates and separates the mixed fluid discharged from the drain water generation source into a liquid and a gas in a state where the drain water W (liquid) and the compressed air (gas) are mixed. A separation tank for floating and separating oil droplets contained in a liquid, and includes a treatment tank main body 20 constituted by a container body 21 and a lid body 22. In this case, the container body 21 is provided with a drain port 21a for draining the separated drain water W, and the lid body 22 is provided with an inlet port 22a for introducing the mixed fluid. . In order to facilitate understanding of the configuration of the purification processing system 1, an example in which a “gas-liquid separation tank” is configured by the processing tank body 20 having a simple configuration including only the container body 21 and the lid body 22 will be described. Instead of the configuration of the gas-liquid separation tank 2 described above, a “gas-liquid separation tank” having various configurations capable of separating the “mixed fluid” into “liquid” and “gas” can be employed.

  The first treatment tank 3a and the second treatment tank 3b (hereinafter also referred to as “treatment tank 3” when not distinguished from each other) are examples of the “purification treatment tank”, and as shown in FIG. The lamp 34 and the air supply unit 36 are accommodated in the processing tank main body 30. Moreover, the processing tank main body 30 is a lid provided with a container body 31 provided with a drain port 31a for draining the drain water W subjected to the purification treatment, and an introduction port 32a for introducing the drain water W to be treated. A body 32 and a water guide plate 35 are provided.

  In this case, in this purification processing system 1, the highest part (the highest part in the flow path of the drain water W) in the water supply pipe 12 and the drain pipe 13 is, for example, in the treatment tank body 30 (container body 31). The water supply pipe 12 and the drainage pipe 13 are connected to the drainage port 31a so as to be located at about 1/3 from the upper side in the height direction. In other words, in this purification processing system 1, a portion of about 1/3 from the top of the treatment tank main body 30 of the first treatment tank 3 a is located at the same height as the highest position in the water supply pipe 12. While the 1st processing tank 3a is arrange | positioned, the site | part of about 1/3 from the upper direction in the processing tank main body 30 of the 2nd processing tank 3b is located in the height comparable as the highest level site | part in the drainage piping 13. The 2nd processing tank 3b is arrange | positioned.

  Therefore, in this purification treatment system 1, when the water level of the drain water W introduced into the first treatment tank 3a becomes about 2/3 from the lower side in the height direction of the treatment tank body 30, the drainage port 31a The drain water W entering the water supply pipe 12 is introduced into the second treatment tank 3b, and the water level of the drain water W introduced into the second treatment tank 3b is lower in the height direction in the treatment tank body 30. The drain water W that has entered the drainage pipe 13 from the drain port 31a is drained into the drainage groove. Thereby, in this purification processing system 1, in the processing tank main body 30 of both the processing tanks 3, the drain water W of the amount greatly exceeding 2/3 of the height direction is not stored, but both the processing tank main bodies 30 are stored. The state where air is present in a space of about 1/3 from the upper side in the height direction is maintained.

As an example, the photocatalytic filter 33 is a surface of an aggregate (an example of an “aggregate formed of a porous body”) formed into a cylindrical shape by porous ceramics formed by sintering an open-cell base material. (The outer peripheral surface, the inner peripheral surface, and the inner wall surface of each hole) are coated with TiO ₂ (an example of “photocatalyst”) (“an example of a configuration in which a photocatalyst is disposed at least on the surface portion”)), It is accommodated in the treatment tank main body 30 so that the drain water W is passed from the inner side to the outer side of the photocatalytic filter 33 through each hole of the aggregate. Note that the "photocatalyst" coating to aggregate, may be used if necessary, any additives TiO ₂ the material obtained by adding (such as Ag).

  In this case, in the processing tank 3 of this example, the height (cylinder length) of the photocatalytic filter 33 is configured to be equal to the height of the processing tank main body 30 (depth of the container body 31). Moreover, in the processing tank 3 of this example, as mentioned above, it is comprised so that the state which air exists in about 1/3 space from the upper side of the height direction in the processing tank main body 30 is maintained. Therefore, in this processing tank 3, the lower part (in this example, about 2/3 of the lower side) of the photocatalytic filter 33 is immersed in the drain water W stored in the processing tank main body 30, and the stored drain water. The upper part of the photocatalytic filter 33 (about 1/3 of the upper side in this example) is positioned above the liquid level of W.

  The light source lamp 34 is disposed inside the photocatalytic filter 33 and irradiates the photocatalytic filter 33 with ultraviolet rays. In this case, as an example, the light source lamp 34 of this example includes a straight tube type fluorescent tube as a light source and is formed in a rod shape as a whole. As an example, the light source lamp 34 is attached downward to the lower surface of the water guide plate 35 so as to be positioned at the center of the photocatalytic filter 33 in the cylinder radial direction. Thereby, as will be described later, in the state where the drain water W is stored in the treatment tank main body 30, the base end portion (the end portion on the side fixed to the water guide plate 35: the upper end portion) side of the light source lamp 34 is provided. A part of the light source lamp is positioned above the liquid level of the drain water W (in the processing tank main body so that at least a part of the light source lamp is positioned above the liquid level of the stored processing target liquid. An example of a configuration of “accommodated”).

  The water guide plate 35 is an example of a “guide mechanism”, and is formed in a disk shape having a slightly smaller diameter than the inner diameter of the photocatalytic filter 33, and the plate surface (upper surface) thereof is horizontal, On the other hand, it is attached to the lid 32 so as to be positioned inside the photocatalytic filter 33 when the lid 32 is attached. As will be described later, the water guide plate 35 causes the drain water W introduced into the treatment tank body 30 from the introduction port 32a to flow along the plate surface so as to extend toward the outer edge portion. The drain water W is guided to the upper part of the photocatalytic filter 33. Thereby, as will be described later, in the processing tank 3, the drain water W introduced into the processing tank body 30 flows down through the photocatalytic filter 33 and is stored.

  The air supply unit 36, together with the air pump 4, constitutes a “gas supply mechanism” that is an example of a “stirring mechanism”. The air supply unit 36 is disposed at the bottom of the processing tank body 30 and supplies air (an example of “gas”) fed from the air pump 4 through the air hose 4 a into the processing tank body 30. By (discharging), bubbles are generated in the drain water W stored in the treatment tank main body 30, and the drain water W is stirred by the rising of the bubbles.

  When purifying the drain water W by the purification processing system 1, first, the drain water generation source and the gas-liquid separation tank 2 are connected to each other via a connection pipe (not shown) and the drain pipe 13 Lay the downstream end in the drain. The installation of the gas-liquid separation tank 2 and both treatment tanks 3 and the connection of the gas-liquid separation tank 2 and both treatment tanks 3 through the water supply pipes 11 and 12 are described as already completed. Omitted.

  Next, a power switch (not shown) is operated to turn on the light source lamps 34 in both treatment tanks 3 to irradiate the photocatalytic filter 33 with ultraviolet rays, and from the air pump 4 to the air supply unit 36 in both treatment tanks 3. Air is supplied through the air hose 4a. At this time, in the treatment tank 3, as described above, the light source lamp 34 is installed so that the light source lamp 34 is positioned at the center of the photocatalytic filter 33 in the cylinder radial direction. Therefore, the ultraviolet rays emitted from the light source lamp 34 are uniformly applied to each part of the photocatalytic filter 33. In this example, the photocatalytic filter 33 is formed using porous ceramics having relatively large pores as an aggregate. Therefore, the ultraviolet light from the light source lamp 34 is not only irradiated to the inner peripheral surface of the photocatalytic filter 33 but also irradiated into each hole when passing through each hole, and also passes through each hole and passes through the processing tank body 30. UV rays reflected on the inner side of the photocatalytic filter 33 are also irradiated on the outer peripheral surface of the photocatalytic filter 33.

  Subsequently, a valve (not shown) provided in a connection pipe connecting the drain water source and the gas-liquid separation tank 2 is opened. At this time, a mixed fluid of drain water W and compressed air is introduced into the treatment tank main body 20 from the inlet 22a, and this mixed fluid is separated into drain water W and compressed air in the treatment tank main body 20. . Further, the separated compressed air is released into the atmosphere through a gap between the container body 21 and the lid body 22, and the separated drain water W is sequentially stored in the treatment tank body 20. Furthermore, oil droplets (relatively large lump of oil) contained in the stored drain water W are floated in the treatment tank body 20 and separated from the drain water W.

  On the other hand, when a specified amount of drain water W is stored in the gas-liquid separation tank 2, the drain water W entering the water supply pipe 11 from the drain port 21a as the water level in the treatment tank body 20 rises. Is introduced into the first treatment tank 3a from the introduction port 32a. At this time, the drain water W introduced from the introduction port 32 a is caused to flow along the plate surface of the water guide plate 35 and is guided to the inner peripheral surface at the upper end portion of the photocatalytic filter 33. Further, the drain water W guided to the upper end portion of the photocatalyst filter 33 flows down toward the bottom portion of the processing tank body 30 through the photocatalyst filter 33.

  At this time, since the photocatalytic filter 33 is irradiated with a sufficient amount of ultraviolet light as the light source lamp 34 is turned on, the drain water W flowing down through the photocatalytic filter 33 is sufficiently purified by the photocatalytic reaction. Further, for a while after the drain water W starts to be introduced into the treatment tank main body 30, almost the entire photocatalytic filter 33 and the light source lamp 34 are exposed to the air, so that the light is emitted from the light source lamp 34. Ultraviolet rays are sufficiently irradiated to the entire tube length direction of the photocatalytic filter 33 without being greatly attenuated. Thereby, the drain water W flowing down through the photocatalytic filter 33 is suitably purified.

  Further, the drain water W that has flowed down through the photocatalytic filter 33 is stored in the treatment tank body 30. At this time, when the drain water W is stored such that the air supply unit 36 is submerged, the air supplied from the air pump 4 is discharged into the drain water W as bubbles. Therefore, the drain water W stored in the first treatment tank 3a is agitated as the bubbles rise. In this case, in the portion where the drain water W in the treatment tank body 30 is stored, the ultraviolet light emitted from the light source lamp 34 attenuates to some extent when it passes through the drain water W, but this ultraviolet light is transmitted to the photocatalytic filter 33. On the other hand, the state of being continuously irradiated is maintained. Therefore, the drain water W in the first treatment tank 3a is agitated by the air (bubbles) supplied (discharged) from the air supply unit 36, so that the entire drain water W stored is the photocatalytic filter 33. As a result, the drain water W is sufficiently purified by the photocatalytic reaction.

  In this case, unlike the processing tank 3 of this example, in the “purification processing tank” in which the “processing tank body” is configured such that the entire photocatalytic filter 33 is positioned above the liquid level of the stored drain water W ( The drain water W that has flowed down through the photocatalytic filter 33 (the drain water W stored in the “treatment tank main body”) is not in contact with the photocatalytic filter 33. Therefore, when adopting such a configuration, it is necessary to complete the purification while the introduced drain water W flows down through the photocatalytic filter 33. On the other hand, in the processing tank 3 of this example, the processing tank main body 30 is configured so that the lower side of the photocatalytic filter 33 is immersed in the stored drain water W. Therefore, the drain water W flowing down through the photocatalytic filter 33 and stored in the treatment tank body 30 is continuously purified by the photocatalytic reaction that occurs on the lower side of the photocatalytic filter 33.

  On the other hand, when the water level of the drain water W stored in the first treatment tank 3a reaches about ３ from the top in the height direction of the treatment tank main body 30 (container body 31), the water supply pipe from the drain port 31a. The drain water W entering the inside 12 is introduced into the second treatment tank 3b. At this time, the drain water W introduced into the second treatment tank 3b from the inlet 32a is introduced into the second treatment tank 3b in the same manner as the drain water W introduced from the gas-liquid separation tank 2 into the first treatment tank 3a. Is guided to the inner peripheral surface of the upper end portion of the photocatalyst filter 33, and is sufficiently purified by the photocatalytic reaction when flowing down the photocatalyst filter 33 toward the bottom portion of the processing tank body 30. At this time, the purification process that occurs in the second treatment tank 3b is the same as the purification process in the first treatment tank 3a, and a description thereof will be omitted.

  In this case, in the state where the drain water W is sequentially fed from the first treatment tank 3a to the second treatment tank 3b, the first treatment tank 3a has an upper side in the height direction of the treatment tank body 30 (container body 31). Thus, a state where air exists in a space of about 1/3 is maintained. Therefore, in this space, the ultraviolet light emitted from the light source lamp 34 is sufficiently irradiated to the photocatalytic filter 33 without being greatly attenuated. Thereby, in the range of about 1/3 from the upper side of the processing tank main body 30 in the first processing tank 3a, a state in which the drain water W flowing down through the photocatalytic filter 33 is sufficiently purified is maintained. In addition, since the ultraviolet rays are continuously irradiated to the photocatalytic filter 33 even in the range of 2/3 from the lower side in the first treatment tank 3a, the drain water W is supplied by the air (bubbles) supplied from the air supply unit 36. As a result, the drain water W is suitably in contact with the photocatalytic filter 33 and is sufficiently purified.

  Further, when the water level of the drain water W stored in the second treatment tank 3b reaches about 1/3 from the upper side in the height direction of the treatment tank body 30 (container body 31), the drainage pipe is connected to the drainage port 31a. The drain water W entering the inside 13 is drained into the drainage groove. At this time, in the state where the drain water W is sequentially drained from the second treatment tank 3b to the drainage groove, the second treatment tank 3b is 1 from the upper side in the height direction of the treatment tank body 30 (container body 31). A state in which air exists in a space of about / 3 is maintained. Therefore, the drain water W flowing down through the photocatalytic filter 33 is sufficiently purified in the range of about 1/3 from the upper side of the processing tank body 30 in the same manner as in the first processing tank 3a described above. Is done. Further, in the range of 2/3 from the lower side of the second treatment tank 3b, the photocatalyst filter 33 is continuously irradiated with ultraviolet rays in the same manner as in the first treatment tank 3a described above. As the drain water W is agitated by the air (bubbles) supplied (discharged) from 36, the drain water W suitably contacts the photocatalyst filter 33, and thus is sufficiently purified.

  As described above, in the processing tank 3, the processing tank main body 30 has the lower part of the photocatalytic filter 33 immersed in the stored drain water W, and the upper side of the photocatalytic filter 33 above the liquid level of the stored drain water W. The photocatalyst filter 33 is configured to be accommodated so that the side portion is positioned, and is provided with a water guide plate 35 that guides the drain water W introduced into the treatment tank body 30 to the upper side portion of the photocatalyst filter 33. The light source lamp 34 is accommodated in the processing tank body 30 so that at least a part thereof is positioned above the liquid level of the drain water W stored in the processing tank body 30. In addition, the purification treatment system 1 includes the treatment tank 3 and is configured to purify the drain water W.

  Therefore, according to the treatment tank 3 and the purification treatment system 1 including the treatment tank 3, the ultraviolet light from the light source lamp 34 is irradiated on the photocatalyst filter 33 on the upper side in the treatment tank body 30 without being greatly attenuated, Since the drain water W is guided to the upper part of the photocatalyst filter 33 and flows through the photocatalyst filter 33, the photocatalytic reaction by the photocatalyst filter 33 is preferably caused to sufficiently purify the drain water W. Further, it is possible to irradiate the photocatalytic filter 33 with a sufficient amount of ultraviolet rays without providing a “light source lamp” having a high-luminance light source or a plurality of “light source lamps”, thereby avoiding an increase in power consumption. Thus, the running cost can be sufficiently reduced. Furthermore, since the lower part of the photocatalyst filter 33 is immersed in the drain water W in the treatment tank body 30, the drain water W introduced into the treatment tank body 30 flows down through the photocatalyst filter 33. In addition, even in a state where the drain water W is stored in the lower portion of the treatment tank body 30, it can be suitably purified by the photocatalytic reaction by the photocatalytic filter 33.

  Further, according to the purification treatment system 1 including the treatment tank 3 and the treatment tank 3, the treatment tank 3 is stored by being provided with the “stirring mechanism” for stirring the drain water W stored in the treatment tank main body 30. The drain water W is preferably brought into contact with the surface of the photocatalyst filter 33 at the lower portion of the treatment tank body 30 where the ultraviolet light attenuates to some extent when passing through the drain water W, and sufficiently purified by the photocatalytic reaction. it can.

  Furthermore, according to the treatment tank 3 and the purification treatment system 1 provided with the treatment tank 3, an air supply for supplying gas into the stored drain water W and stirring the drain water W with the gas (bubbles). By providing the “stirring mechanism” with the portion 36, the stored drain water W can be suitably stirred and brought into contact with the photocatalytic filter 33 with a relatively simple configuration. Further, since the drain water W can be agitated without disposing a movable mechanism part in a portion submerged in the stored drain water W, a complicated maintenance work is unnecessary, and the treatment tank 3 (purification treatment system 1 ) Can be maintained over a long period of time.

  Further, according to the treatment tank 3 and the purification treatment system 1 including the treatment tank 3, the photocatalytic filter 33 is formed in a cylindrical shape (cylindrical in this example), and the light source lamp 34 is disposed inside the photocatalytic filter 33. Accordingly, the photocatalytic filter 33 can be efficiently and evenly irradiated with the ultraviolet rays from the light source lamp 34, so that a photocatalytic reaction can be suitably caused in each part of the photocatalytic filter 33.

  Furthermore, according to the treatment tank 3 and the purification treatment system 1 provided with the treatment tank 3, the photocatalyst filter 33 is configured by coating a photocatalyst on an aggregate (in this example, porous ceramics) formed of a porous body. As a result, the surface area of the photocatalyst can be sufficiently expanded. As a result, it is possible to more efficiently irradiate the photocatalyst with ultraviolet rays from the light source lamp 34 and to efficiently bring the drain water W into contact with the photocatalyst. Therefore, it can be purified more suitably. Further, it can be made lighter than a photocatalytic filter in which a solid aggregate is coated with a photocatalyst.

  Further, according to the purification processing system 1, the gas-liquid separation tank 2 disposed upstream of the processing tank 3 is provided, and the drain water W from which gas has been separated in the gas-liquid separation tank 2 is discharged by the processing tank 3. By purifying, since large oil droplets can be floated and separated before being introduced into both treatment tanks 3, the drain water W is more suitably purified without causing a situation in which the photocatalytic filter 33 is clogged. can do.

  Note that the configurations of the “purification treatment tank” and the “purification treatment system” are not limited to the configurations of the treatment tank 3 and the purification treatment system 1 described above. For example, the purification processing system 1 including the two processing tanks 3 of the first processing tank 3a and the second processing tank 3b has been described as an example, but one “purification processing tank (processing tank 3)” is described. The “purification processing system” can be configured, or the “purification processing system” can be configured by including any number of three or more “purification processing tanks (processing tanks 3)” (not shown). ). In this case, in the case where the “purification treatment system” is configured by including one “purification treatment tank”, as an example, the drainage pipe 13 is connected to the drain port 31a of the first treatment tank 3a in the purification treatment system 1 described above. Connecting. In addition, when a “purification treatment system” is configured by including three or more “purification treatment tanks”, as an example, an upstream “purification treatment tank” and a downstream “purification treatment tank” The connection relationship and the positional relationship are configured in the same manner as the connection relationship and the positional relationship between the first treatment tank 3a and the second treatment tank 3b in the purification processing system 1 described above.

  Moreover, although the example which comprised the air supply part 36 which stirs the drain water W with the gas supplied in the stored drain water W and comprised "stirring mechanism" was demonstrated, the structure of "stirring mechanism" is this example. It is not limited to. For example, the purification processing system 1A shown in FIG. 3 includes a treatment tank 5 (another example of “purification treatment tank”) instead of the treatment tank 3 in the purification treatment system 1 described above. The processing tank 5 includes a propeller 5a that is rotated by a motor 5b in place of the air supply unit 36 in the processing tank 3 (another example of the “stirring mechanism”). The structure which stirs the drain water W stored is employ | adopted. The purification processing system 1A and purification processing systems 1B and 1C (see FIGS. 4 and 5) described later are configured in the same manner as the purification processing system 1 except that the configuration of the “purification processing tank” is different. ing. 3 illustrates an example in which the motor 5b is installed in the processing tank body 30 together with the propeller 5a, the motor 5b may be installed outside the processing tank body 30.

  Further, the purification treatment system 1B shown in FIG. 4 is configured to include a treatment tank 6 (a further example of “purification treatment tank”) instead of the treatment tank 3 in the purification treatment system 1 described above. In this processing tank 6, instead of the air supply unit 36 in the processing tank 3, the propeller 5a and the motor 5b in the processing tank 5, the drain water W stored in the processing tank main body 30 is circulated by the water pump 6b. (A further example of the “stirring mechanism”). In this case, as an example, the circulation pipe 6 a is piped so that drain water W is taken from the bottom of the container body 31 and drained into the treatment tank body 30 from the inlet 32 a of the lid 32.

  In the treatment tanks 5 and 6 (purification treatment systems 1A and 1B) provided with such a “stirring mechanism”, the stored drain water W is permeated in the same manner as the treatment tank 3 (purification treatment system 1) described above. In this case, the drain water W can be suitably brought into contact with the surface of the photocatalyst filter 33 at the lower portion of the treatment tank body 30 where the ultraviolet rays are attenuated to some extent, and can be sufficiently purified by the photocatalytic reaction. Further, the drain water W is introduced into the inside of the cylindrical photocatalytic filter 33, and the drain water W is drained from the drain port 31a located outside the photocatalytic filter 33 as an example. It is also possible to adopt a configuration in which the drain water W is introduced outside the “photocatalytic filter” and the drain water W is drained from a drain outlet provided inside the “photocatalytic filter”. Even when such a configuration is adopted, the drain water W can be sufficiently purified in the same manner as the purification processing system 1 (processing tank 3).

In addition, the processing tanks 3, 5, and 6 configured with the cylindrical photocatalytic filter 33 have been described as examples. However, the processing tank 7 of the purification processing system 1C illustrated in FIG. For example, a photocatalytic filter 33a configured by coating TiO _{2 on} the surface of a plate-like porous ceramic can also be used. In this treatment tank 7 (purification treatment system 1C), as an example, the treatment tank main body 30 is partitioned in the left-right direction by the photocatalytic filter 33a, and one of the left and right spaces partitioned by the photocatalytic filter 33a (this example) Then, a configuration is adopted in which the drain water W flows through the photocatalytic filter 33a from the left space) toward the other space (in this example, the right space). Even in the case of adopting such a configuration, the ultraviolet light from the light source lamp 34 is irradiated to the photocatalyst filter 33a on the upper side in the processing tank body 30 without being greatly attenuated, and the drain water is applied to the upper part of the photocatalyst filter 33a. Since W is guided and flows through the photocatalytic filter 33a, the photocatalytic reaction by the photocatalytic filter 33a is preferably caused to sufficiently purify the drain water W.

  Furthermore, the photocatalytic filter 33, 33a using porous ceramics as an aggregate has been described as an example. However, a photocatalyst is coated on an arbitrary aggregate such as porous metal or glass to constitute a “photocatalytic filter”. be able to. Moreover, although the example which comprised the drain water W stored in the processing tank main body 30 passing the photocatalyst filters 33 and 33a was demonstrated, only "the process target liquid" touches the surface of the "photocatalyst filter", A part or all of the “treatment target liquid” may be configured not to pass through the “photocatalytic filter”. When such a configuration is adopted, an aggregate having fine irregularities formed on its surface (for example, an aggregate formed of “porous ceramic formed by sintering a closed cell base material”) is used. By adopting the “photocatalyst filter” formed in this way, it is possible to suitably purify the “treatment target liquid” by the amount of the large surface area of the photocatalyst.

  In this case, in the configuration in which the liquid to be treated does not pass through the photocatalytic filter, the entire “photocatalytic filter” can be configured by “photocatalyst”, or a solid material (porous material formed of metal, ceramics, glass, etc.) The photocatalyst may be coated on the surface of the aggregate (not aggregate) to form a “photocatalytic filter”. When the entire “photocatalyst filter” is composed of “photocatalyst” or the photocatalyst filter is formed by coating photocatalyst on any solid material, the surface of these “photocatalyst filters” is uneven. It is preferable to increase the surface area of the “photocatalyst”.

  Further, instead of the light source lamp 34 having a straight tube type light source, a “light source lamp” (not shown) having a spherical light source lamp may be employed. When such a “light source lamp” is employed, it is preferable that the “light source lamp” is installed in the “treatment tank body” so as to be exposed from the drain water W stored. Further, the purification processing systems 1 and 1A to 1C configured to include the gas-liquid separation tank 2 have been described as examples. However, the “purification processing system” can be configured without providing the “gas-liquid separation tank”. . In addition, a “purification processing system” can be configured by mutually connecting various filters such as a filtration filter and an adsorption filter and the “purification processing tank” according to the present invention.

1, 1A-1C Purification treatment system 2 Gas-liquid separation tank 3a First treatment tank 3b Second treatment tank 4 Air pump 4a Air hose 5-7 Treatment tank 5a Propeller 5b Motor 6a Circulation piping 6b Water pump 20, 30 Treatment tank Main body 31 Container body 31a Drain port 32 Cover body 32a Inlet port 33, 33a Photocatalytic filter 34 Light source lamp 35 Water guide plate 36 Air supply unit W Drain water

Claims (7)

A treatment tank main body configured to be able to store a liquid to be treated; a photocatalyst filter disposed at least on the surface of the treatment tank and housed in the treatment tank main body; and a light source lamp for irradiating the photocatalyst filter with ultraviolet rays A purification treatment tank comprising:
The processing tank main body has a lower part of the photocatalytic filter immersed in the stored processing target liquid, and an upper part of the photocatalytic filter is positioned above the liquid level of the stored processing target liquid. The photocatalytic filter is configured to be accommodated, and includes a guide mechanism that guides the processing target liquid introduced into the processing tank body to the upper side portion of the photocatalytic filter,
The said light source lamp is the purification processing tank accommodated in the said processing tank main body so that at least one part in the said light source lamp may be located above the liquid level of the said process target liquid stored in the said processing tank main body .   The purification processing tank according to claim 1, further comprising an agitation mechanism for agitating the processing target liquid stored in the processing tank main body.   The purification processing tank according to claim 2, wherein the stirring mechanism includes a gas supply mechanism that supplies a gas into the stored processing target liquid and stirs the processing target liquid with the supplied gas. The photocatalytic filter is formed in a cylindrical shape,
The purification lamp according to any one of claims 1 to 3, wherein the light source lamp is disposed inside the photocatalytic filter.   The said photocatalyst filter is a purification processing tank in any one of Claim 1 to 4 with which the said photocatalyst is coated by the aggregate formed with the porous body.   A purification processing system comprising the purification treatment tank according to any one of claims 1 to 5 and configured to purify the liquid to be treated.   The purification processing system of Claim 6 provided with the gas-liquid separation tank arrange | positioned in the upstream of the said purification processing tank, and purifying the said process target liquid from which the gas was isolate | separated in the said gas-liquid separation tank with the said purification processing tank. .

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