Ultraviolet irradiation equipment equipped with a reaction vessel, and reaction vessel

Abstract

To provide an ultraviolet irradiation facility for prevent components inside a reaction tank from being damaged by drifting or eddy currents of treatment water, and suppressing an increase in an installation area of the ultraviolet irradiation facility.SOLUTION: There is provided an ultraviolet irradiation facility including: a water supply port that supplies treatment water to be treated; a drain port that drains the treatment water; an ultraviolet irradiation member that radiates ultraviolet rays; a reaction tank that irradiates the treatment water with ultraviolet rays from the ultraviolet irradiation member while passing the treatment water in a direction from the water supply port toward the drain port; facility components arranged in front of the water supply port of the reaction tank; and piping provided inside with a rectifying member disposed between the facility component and the water supply port and adjusting a flow of the treatment water, thereby performing sterilization treatment or inactivation treatment for the treatment water.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] Embodiments of the present invention relate to an ultraviolet irradiation facility equipped with a reaction vessel, and to a reaction vessel. [Background technology]

[0002] Conventional disinfection equipment uses chemicals such as ozone and chlorine to disinfect or sterilize water and sewage (tap water or groundwater, etc.), deodorize, decolorize, disinfect or sterilize industrial water, bleach pulp, or disinfect or sterilize medical equipment. However, because such disinfection equipment requires the chemicals such as ozone and chlorine to be uniformly dissolved in the treated water, it necessitates a storage tank (retention tank) for holding the treated water and a stirring device such as a spray pump, making it difficult to respond immediately to changes in the quality and volume of the treated water.

[0003] To address these issues, there are ultraviolet irradiation facilities that use ultraviolet irradiation to sterilize or disinfect water and wastewater, or industrial water. These ultraviolet irradiation facilities irradiate treated water with ultraviolet light while it passes through the reaction tank, allowing for immediate response to changes in the quality and volume of the treated water. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2013-184094 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, in conventional ultraviolet irradiation equipment, the uneven, turbulent, or eddy flow of treated water generated by various equipment components (e.g., strainers, L-shaped pipes, T-shaped pipes, or flow meters, etc.) placed before and after the reaction vessel that irradiates ultraviolet light can damage components inside the reaction vessel (e.g., protective pipes, ultraviolet lamps, or other support components, etc.). Therefore, in order to prevent treated water with uneven, turbulent, or eddy flow from flowing into the reaction vessel, piping to eliminate the uneven, turbulent, or eddy flow of treated water is connected to the inlet and outlet of the reaction vessel. This piping is a simple straight pipe with no other components arranged inside, and by having a length, for example, 10 times the inner diameter of the pipe, eddy flow of treated water passing through the pipe is eliminated.

[0006] Furthermore, in ultraviolet irradiation equipment, there are challenges in preventing damage to internal components of the reaction vessel due to uneven flow or eddies of treated water, as well as in ensuring that the installation area of ​​the ultraviolet irradiation equipment does not become too large. [Means for solving the problem]

[0007] To solve the above problems, the ultraviolet irradiation equipment of this embodiment comprises a reaction tank having a water inlet for supplying treated water to be treated, a drain outlet for draining the treated water, and an ultraviolet irradiation member for irradiating ultraviolet light onto the treated water while the treated water passes through in the direction from the water inlet toward the drain outlet, an equipment component positioned in front of the water inlet of the reaction tank, and a pipe positioned between the equipment component and the water inlet, with a flow straightening member extending inside to regulate the flow of the treated water, and performs sterilization, disinfection, or inactivation treatment on the treated water. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a flowchart showing an example of a water treatment system incorporating the ultraviolet irradiation equipment of this embodiment. [Figure 2] Figure 2 is a flow diagram showing the flow of treated water after filtration in the ultraviolet irradiation equipment. [Figure 3] Fig. 3 is a perspective view showing an example of a reaction tank. [Figure 4] Fig. 4 is a longitudinal sectional view showing the reaction tank cut along the Z-axis direction. [Figure 5] Fig. 5 is a transverse sectional view showing the reaction tank cut along the X-axis and Y-axis plane. [Figure 6] Fig. 6 is a perspective view illustrating a front pipe provided with the flow regulating member of the first example. [Figure 7] Fig. 7 is an explanatory view for explaining the partition dimensions of regular hexagonal water passage holes of the flow regulating member of the first example. [Figure 8] Fig. 8 is a perspective view illustrating a front pipe provided with the flow regulating member of the second example. [Figure 9] Fig. 9 is an explanatory view for explaining the partition dimensions of square water passage holes of the flow regulating member of the second example. [Figure 10] Fig. 10 is a perspective view illustrating a front pipe provided with the flow regulating member of the third example. [Figure 11] Fig. 11 is an explanatory view illustrating water passage holes of the front pipe provided with the flow regulating member of the third example. [Figure 12] Fig. 12 is a perspective view for explaining a tapered pipe connected to the front pipe provided with the flow regulating member of the third example. [Figure 13] Fig. 13 is a sectional view illustrating a state where a tapered pipe is connected to the front pipe provided with the flow regulating member of the third example. MODE FOR CARRYING OUT THE INVENTION

[0009] First, an overview of the treatment flow in the water treatment system incorporating the ultraviolet irradiation equipment 1 of this embodiment will be explained with reference to Figure 1. Figure 1 is a flowchart showing the treatment procedure of the water treatment system. First, raw water is taken from a river, lake, or groundwater as treated water W (step S1), and the taken treated water W is introduced into a coagulation and sedimentation tank, where a coagulant is added to coagulate and settle suspended soil particles, etc. (step S2). Next, the supernatant water from the coagulation and sedimentation tank is sent to an activated carbon filter tank to filter out foreign matter (step S3), and the filtered treated water W is sent to the reaction tank 2 of the ultraviolet irradiation equipment 1 (see Figures 2 and 3). Then, the treated water W is passed through the reaction tank 2 and irradiated with ultraviolet light (UV) (step S4), and the treated water W, which has been sterilized, disinfected, or inactivated by ultraviolet irradiation, is sent to a chlorine injection tank where chlorine is injected (step S5), before being distributed to general households, businesses, etc.

[0010] Figure 2 is a flow diagram showing the flow of filtered treated water W in the ultraviolet irradiation equipment 1 of this embodiment. The ultraviolet irradiation equipment 1 of this embodiment includes, for example, a flow meter 30 through which the filtered treated water W first flows in the ultraviolet irradiation equipment 1, a pre-strainer 31 located after the flow meter 30, a pre-pipe 41A located after the pre-strainer 31, a reaction tank 2 located after the pre-pipe 41A, a post-pipe 42 located after the reaction tank 2, a post-strainer 32 located after the post-pipe 42, and an emergency shut-off valve 50 located after the post-strainer 32.

[0011] As shown in Figure 2, the ultraviolet irradiation equipment 1 is incorporated into the water treatment system, for example, by arranging two units side by side so that they can back each other up, ensuring two separate flow paths for treated water W. Even if one of the two ultraviolet irradiation equipment 1s requires replacement, maintenance, or malfunction, the other ultraviolet irradiation equipment 1 can continue to sterilize, disinfect, or inactivate the treated water W. In other words, in the example shown in Figure 2, the filtered treated water W flows into the respective flow meters 30 of the two ultraviolet irradiation equipment 1 via a branch pipe. Furthermore, after sterilization or other treatments have been performed in each ultraviolet irradiation equipment 1, the treated water W is combined, for example, and then chlorine is injected.

[0012] Figure 3 is a perspective view showing an example of a reaction vessel 2. The reaction vessel 2 has a water inlet 200 for supplying treated water W to be treated, a drain outlet 202 for draining treated water W, and an ultraviolet irradiation member 22 for irradiating with ultraviolet light. The treated water W can be passed through from the water inlet 200 towards the drain outlet 202 while ultraviolet light is irradiated onto the treated water W from the ultraviolet irradiation member 22. In the following description, a Cartesian coordinate system of X, Y, and Z axes is used. The X-axis direction includes the +X direction and the -X direction. The Y-axis direction includes the +Y direction and the -Y direction. The Z-axis direction includes the +Z direction and the -Z direction. For example, the X-Y axis plane is the horizontal plane, and the Z-axis direction is the vertical direction.

[0013] The reaction tank 2 is used to pass treated water W through which sterilization, disinfection, or inactivation treatment is performed, and includes a housing 20 formed in a substantially rectangular parallelepiped shape. The housing 20 has a water inlet 200 with a water supply port for supplying (inflowing) the treated water W, and a drain port 202 with a drain port for discharging (outflowing) the treated water W that has undergone sterilization treatment by UV irradiation, etc. The water inlet 200 and the drain port 202 are formed on opposing side walls 20a and side wall 20b of the housing 20 in the Y-axis direction.

[0014] The water inlet 200 is equipped with a flange portion 200a extending radially from the water inlet 200, and bolt holes (not shown) are formed in the flange portion 200a. The drain outlet 202 is equipped with a flange portion 202a extending radially from the drain outlet 202, and bolt holes (not shown) are formed in the flange portion 202a.

[0015] The treated water W flows from the water inlet 200 towards the drain outlet 202 (from the -Y direction to the +Y direction in Figure 3) and passes through the reaction tank 2. The ultraviolet irradiation member 22 installed in the reaction tank 2 shown in Figures 4 and 5 is equipped with, for example, a protective tube 221. The protective tube 221 is made of a dielectric material that allows ultraviolet light to pass through, for example, quartz glass. Inside the protective tube 221 is an ultraviolet lamp 225 that irradiates the treated water W passing from the water inlet 200 towards the drain outlet 202 with ultraviolet light. As shown in Figure 4, the ultraviolet lamp 225 is, for example, connected to both ends with wiring for supplying power to the ultraviolet lamp 225, and connected to a power supply source 228 that supplies power via this wiring. The ultraviolet lamp 225, which is the ultraviolet light source, is, for example, an LED, a mercury lamp, or a metal halide lamp, and can emit ultraviolet light 227 of a predetermined wavelength.

[0016] For example, the protective tubes 221 shown in Figures 3 and 4 are provided in four sections inside the housing 20, extending in the X-axis direction which intersects the Y-axis direction, which is the direction from the water inlet 200 to the drain outlet 202. Specifically, the protective tubes 221 in this embodiment are provided in four sections inside the housing 20, penetrating the side wall 20c of the housing 20 and the side wall 20d that is opposite to the side wall 20c in the X-axis direction. In this embodiment, the protective tubes 221 and the ultraviolet lamp 225 constitute the ultraviolet irradiation member 22.

[0017] As shown in Figure 4, for example, the reaction vessel 2 is equipped with ultraviolet monitoring windows 24 for installing ultraviolet monitoring units 243. Two ultraviolet monitoring windows 24 are provided, for example, on the top plate 20e which is perpendicularly connected to the side walls 20a, 20b, 20c, and 20d of the housing 20. The ultraviolet monitoring unit 243 attached to the ultraviolet monitoring windows 24 is equipped with, for example, an ultraviolet intensity meter and a control panel, and monitors the amount of ultraviolet radiation irradiated onto the treated water W from the ultraviolet lamp 225, as well as the status of the ultraviolet lamp 225 and the protective tube 221.

[0018] As shown in Figures 4 and 5, the housing 20 is covered by a protective cover 25. The protective cover 25 shields the ultraviolet light 227 emitted from the ultraviolet lamp 225 from leaking to the outside and is provided on the outside of the side walls 20c and 20d of the housing 20. Note that Figure 3 is a diagram in which the protective cover 25 is omitted.

[0019] The ribs 26 shown in Figures 3 and 5 suppress overall deformation due to the increase in internal pressure in the reaction vessel 2, and are provided on the outer circumference of the reaction vessel 2, namely the side walls 20c and 20d, the top plate 20e, and the bottom plate 20f that faces the top plate 20e in the Z-axis direction. The ribs 26 are also provided near the center of the housing 20 in the Y-axis direction.

[0020] The flow meter 30 shown in Figure 2 is an example of equipment component placed in front of the reaction vessel 2. For example, electromagnetic, differential pressure, ultrasonic, vortex, or volumetric flow meters can be used, but this example is not limited to this one.

[0021] The front strainer 31 shown in Figure 2 is, for example, a conical strainer, a Y-type strainer, or a T-type strainer, but other strainers may also be used. In this embodiment, the flow meter 30 and the front strainer 31 are equipment components placed in front of the water inlet 200 (see Figure 3) of the reaction tank 2. Note that the equipment components placed in front of the water inlet 200 of the reaction tank 2 are not limited to the two examples above, and for example, L-shaped piping, T-shaped piping, various valves, or tapered piping may be placed as equipment components.

[0022] Figure 6 is a perspective view showing an example of a pre-pipe 41A that is positioned between the pre-strainer 31 shown in Figure 2 and the water inlet 200 of the reaction tank 2, and in which a flow straightening member 43 (hereinafter referred to as the first example flow straightening member 43) for regulating the flow of treated water W is inserted so as to extend in the Y-axis direction inside. The pre-pipe 41A comprises, for example, a cylindrical section 410 and two annular plate-shaped mounting flanges 411 that extend integrally outward in the radial direction at both ends of the cylindrical section 410. For example, the inner diameter of the cylindrical section 410 is defined as the inner diameter J.

[0023] In the equipment components shown in Figure 2, such as the flow meter 30 and the pre-strainer 31, turbulence, eddies, or uneven flow are likely to occur in the treated water W. If the treated water W were to flow into the reaction tank 2 while still containing turbulence, eddies, or uneven flow, the ultraviolet lamp 225 and protective tube 211 shown in Figure 4 inside the reaction tank 2 may be damaged, or ultraviolet light may not be properly irradiated onto the treated water W from the ultraviolet lamp 225. Therefore, a pre-pipe 41A equipped with a flow straightening member 43 is installed between the pre-strainer 31 and the water inlet 200 of the reaction tank 2. The pre-pipe 41A eliminates the turbulence, eddies, or uneven flow of the treated water W, making the treated water W a laminar flow before it flows into the reaction tank 2.

[0024] For example, the annular end face in the Y-axis direction of the mounting flange 411 of the front pipe 41A shown in Figure 6 is a connecting surface that connects to other members, and bolt holes (not shown) are formed on the connecting surface at equal intervals in the circumferential direction. For example, the front strainer 31 shown in Figure 2 is bolted to the connecting surface of the mounting flange 411 on the -Y direction side, so that the front pipe 41A and the front strainer 31 are in communication. Also, the flange portion 200a of the water inlet 200 of the reaction tank 2 shown in Figure 3 is bolted to the connecting surface of the mounting flange 411 on the +Y direction side, so that the front pipe 41A and the reaction tank 2 are in communication. For example, the center of the cross-section of the cylindrical portion 410 of the front pipe 41A and the center of the water inlet 200 are approximately aligned.

[0025] The first example of a flow straightening member 43, disposed within the cylindrical portion 410 of the front pipe 41A, comprises a plurality of partition plates 431 extending along the extending direction (Y-axis direction) of the front pipe 41A, and hexagonal water passage holes 432 partitioned by the partition plates 431. Multiple water passage holes 432 are arranged without gaps within the front pipe 41A in the radial and circumferential directions of the front pipe 41A. In other words, the first example of a flow straightening member 43 has a honeycomb structure that provides rigidity with respect to the direction of flow of the treated water W.

[0026] In the manufacturing of the front pipe 41A, for example, a predetermined metal member (such as SUS) is produced as a hexagonal prism-shaped tubular intermediate by hot rolling or hot extrusion. The six side plates of the hexagonal prism-shaped tubular intermediate become partition plates 431, and the inside of the tubular intermediate becomes a hexagonal water passage hole 432. Multiple hexagonal prism-shaped tubular intermediates are then joined together by welding or the like. The outer circumference of the joined tubular intermediates is circle-cut so that it can be fitted into the cylindrical section 410 of the front pipe 41A, and the multiple hexagonal prisms are joined together to form a cylindrical flow straightening member 43. The flow straightening member 43 is then inserted into the cylindrical section 410 so as to be pushed in along the extending direction of the cylindrical section 410, and the flow straightening member 43 is fitted into the cylindrical section 410 and fixed to the cylindrical section 410. Therefore, within the cylindrical section 410 of the front pipe 41A, multiple hexagonal water passage holes 432, separated by multiple partition plates 431 made of, for example, metal, are arranged without gaps in the radial and circumferential directions of the cylindrical section 410. Furthermore, the extending direction of each partition plate 431 is parallel to, or approximately parallel to, the extending direction of the cylindrical section 410.

[0027] The flow straightening member 43 has a structure (honeycomb structure) in which multiple hexagonal water passage holes 432 formed by partition plates 431 are arranged without gaps in the radial and circumferential directions of the front pipe 41A. Therefore, it has the property of being resistant to distortion in the X-axis and Z-axis directions which are perpendicular to the flow direction (Y-axis direction) of the treated water W that flows into the front pipe 41A in a state of turbulence or vortex.

[0028] For example, the distance between a partition plate 431 that forms one of the water passage holes 432 in the rectifying member 43 shown in Figures 6 and 7, and a partition plate 431 that is opposite to the said partition plate 431 at a position 180 degrees apart with the center of the water passage hole 432 in between, is the partition dimension da of the partition plate 431 that divides the inside of the front pipe 41A.

[0029] The length K1 of the front pipe 41A shown in Figure 6 is set based on the partition dimension da of the flow straightening member 43 in the first example. That is, in order for the front pipe 41A equipped with the flow straightening member 43 in the first example to perform a flow straightening function for the treated water W, the length K1 of the front pipe 41A is set to, for example, 10 × da. However, the length K1 of the front pipe 41A may be set to a length greater than 10 times the partition dimension da.

[0030] In the first example, the rectifier member 43 is arranged within the front pipe 41A so as to extend from one end to the other in the extending direction (Y-axis direction) of the front pipe 41A. That is, in the example shown in Figure 6, the length of the rectifier member 43 in the Y-axis direction is the same as, or approximately the same as, the length K1 of the front pipe 41A in the Y-axis direction. In the first example, the length of the front pipe 41A is set to be longer by a predetermined length than the length of the rectifier member 43, for example, the rectifier member 43 may extend from one end of the front pipe 41A to a predetermined position inside the cylindrical section 410, and a flow path may be formed in the cylindrical section 410 from that predetermined position to the other end of the front pipe 41A where the rectifier member 43 is not arranged.

[0031] The rear piping 42 shown in Figure 2 is equipped with, for example, the flow straightening member 43 of the first example and has the same configuration as the front piping 41A, so its explanation is omitted. The drain port 202 of the reaction tank 2 is connected to one end of the rear piping 42 that is on the upstream side in the direction of flow of the treated water W. The rear strainer 32 is connected to the other end of the rear piping 42 that is on the downstream side in the direction of flow of the treated water W.

[0032] The rear strainer 32 shown in Figure 2 is, for example, the same type as the front strainer 31. The rear piping 42 is connected to one upstream end of the rear strainer 32, and the emergency shut-off valve 50 is connected to the other downstream end. The rear strainer 32 recovers damaged parts in the event that the protective tube 221 or ultraviolet lamp 225 of the ultraviolet irradiation member 22 shown in Figure 4 is damaged in the reaction tank 2, and prevents the damaged parts from flowing into the chlorine injection tank in step S5 shown in Figure 1.

[0033] The emergency shut-off valve 50 shown in Figure 2 is, for example, a solenoid valve electrically connected to the control panel of the ultraviolet monitor unit 243 shown in Figure 4, and can be opened and closed in response to commands from the ultraviolet monitor unit 243. Note that the emergency shut-off valve 50 is not limited to a solenoid valve, but may be a mechanical valve with a simple structure. The emergency shut-off valve 50 closes the flow path of the ultraviolet irradiation equipment 1 so that if the protective tube 211 or ultraviolet lamp 225 is damaged in the reaction vessel 2, the broken parts of the protective tube 211 or ultraviolet lamp 225 do not flow into the chlorine injection tank in step S5 shown in Figure 1.

[0034] In this embodiment, the rear strainer 32 and emergency shut-off valve 50 shown in Figure 2 are equipment components located after the drain port 202 of the reaction tank 2. Note that the equipment components located after the drain port 202 of the reaction tank 2 are not limited to the two examples above; for example, L-shaped piping, T-shaped piping, flow meters, or tapered piping may also be located as equipment components.

[0035] In the ultraviolet irradiation equipment 1 of this embodiment, a flow meter 30 and a front strainer 31 are placed as equipment components in front of the water inlet 200 of the reaction tank 2. Therefore, a front pipe 41A equipped with a flow straightening member 43 is placed between the front strainer 31 and the water inlet 200. However, if the ultraviolet irradiation equipment 1 is configured not to have equipment components placed in front of the water inlet 200 of the reaction tank 2, then the front pipe 41A may not be provided. Also, in the ultraviolet irradiation equipment 1 of this embodiment, a rear strainer 32 and an emergency shut-off valve 50 are placed as equipment components after the drain port 202 of the reaction tank 2. Therefore, a rear pipe 42 equipped with a flow straightening member 43 is placed between the rear strainer 32 and the drain port 202. However, if the ultraviolet irradiation equipment 1 is configured not to have equipment components placed after the drain port 202 of the reaction tank 2, then the rear pipe 42 may not be provided.

[0036] In this embodiment, the ultraviolet irradiation equipment 1 may be configured such that, instead of the front piping 41A equipped with the first example of flow straightening member 43 shown in Figure 6, a front piping 41B equipped with the second example of flow straightening member 44 shown in Figure 8 is placed between the front strainer 31 shown in Figure 2, which is an equipment component, and the water inlet 200 of the reaction tank 2.

[0037] The following describes the pre-pipe 41B equipped with the second example of the flow straightening member 44. In the pre-pipe 41B, components similar to those in the pre-pipe 41A equipped with the first example of the flow straightening member 43 shown in Figure 6 are denoted by the same reference numerals as in the pre-pipe 41A and their description is omitted. The second example of the flow straightening member 44 inserted into the cylindrical portion 410 of the pre-pipe 41B comprises a plurality of partition plates 441 extending along the extending direction (Y-axis direction) of the pre-pipe 41B, and square water passage holes 442 partitioned by the partition plates 441. Multiple water passage holes 442 are arranged without gaps within the pre-pipe 41B in the radial and circumferential directions of the pre-pipe 41B. In other words, the second example of the flow straightening member 44 has a grid-like structure that is rigid with respect to the direction of flow of the treated water W.

[0038] In the manufacturing of the front pipe 41B, for example, a predetermined metal member (such as SUS) is produced as a rectangular prism-shaped tubular intermediate by hot rolling or hot extrusion. The four side plates of the rectangular prism-shaped tubular intermediate become partition plates 441, and the inside of the tubular intermediate becomes a square water passage hole 442. Multiple rectangular prism-shaped tubular intermediates are then joined together by welding or the like. The outer circumference of the joined tubular intermediates is circle-cut so that it can be fitted into the cylindrical section 410 of the front pipe 41B, and the multiple rectangular prisms are joined together to form a cylindrical flow straightening member 44. The flow straightening member 44 is then inserted into the cylindrical section 410 so as to be pushed along the extending direction of the cylindrical section 410, and the flow straightening member 44 is fitted into the cylindrical section 410 and fixed to the cylindrical section 410. Therefore, within the cylindrical portion 410 of the front pipe 41B, multiple square water passage holes 442, separated by multiple partition plates 441 made of, for example, metal, are arranged side by side without gaps in the radial and circumferential directions of the cylindrical portion 410.

[0039] For example, the distance between a partition plate 441 that forms one of the water passage holes 442 of the rectifying member 44 shown in Figures 8 and 9, and a partition plate 441 that is opposite to the said partition plate 441 at a position 180 degrees apart with the center of the water passage hole 442 in between, is the partition dimension db of the partition plate 441 that divides the inside of the front pipe 41A.

[0040] The length K2 of the front pipe 41B shown in Figure 8 is set based on the partition dimension db of the flow straightening member 44 in the second example. That is, in order for the front pipe 41B equipped with the flow straightening member 44 in the second example to perform a flow straightening function for the treated water W, the length K2 of the front pipe 41B is set to, for example, 10 × db. However, the length K2 of the front pipe 41B may be set to a length greater than 10 times the partition dimension db.

[0041] In the second example, the rectifier member 44 is arranged within the front pipe 41B so as to extend from one end to the other in the extending direction (Y-axis direction) of the front pipe 41B. That is, in the example shown in Figure 8, the length of the rectifier member 44 in the Y-axis direction is the same as, or approximately the same as, the length K2 of the front pipe 41B in the Y-axis direction. In the second example, the length of the front pipe 41B is set to be a predetermined length longer than the length of the rectifier member 44, for example, the rectifier member 44 may extend from one end of the front pipe 41B to a predetermined position inside the cylindrical portion 410, and a flow path may be formed in the cylindrical portion 410 from that predetermined position to the other end of the front pipe 41B where the rectifier member 44 is not arranged.

[0042] In this embodiment, the ultraviolet irradiation equipment 1 may be configured such that, instead of the rear piping 42 equipped with the rear piping 42 equipped with the rear piping 43 of the first example shown in Figure 2, a rear piping equipped with the rear piping 44 of the second example shown in Figure 8 is placed between the rear strainer 32, which is an equipment component, and the drain port 202 of the reaction tank 2.

[0043] In this embodiment, the ultraviolet irradiation equipment 1 may be configured such that, instead of the front piping 41A equipped with the first example of flow straightening member 43 shown in Figure 6, a front piping 41C equipped with the third example of flow straightening member 45 shown in Figure 10 is placed between the front strainer 31 shown in Figure 2, which is an equipment component, and the water inlet 200 of the reaction tank 2.

[0044] The following describes the front piping 41C equipped with the third example of the rectifier member 45 shown in Figure 10. Note that in the front piping 41C, components similar to those in the front piping 41A equipped with the first example of the rectifier member 43 shown in Figure 6 are denoted by the same reference numerals as in the front piping 41A, and their explanation is omitted.

[0045] The third example of a flow straightening member 45, disposed within the cylindrical portion 410 of the front pipe 41C, comprises a plurality of cylinders 451, 452, and 453 (three in the illustrated example) with different inner diameters, extending along the extending direction of the front pipe 41C. The plurality of cylinders 451 to 453 are stacked on top of each other, with predetermined intervals provided as water passage holes 452a and 453a between cylinder 451 and cylinder 452, and between cylinder 452 and cylinder 453, centered on the center of cylinders 451 to 453. The third example of a flow straightening member 45 also includes, for example, two fixing rods 457 for fixing the plurality of concentrically stacked cylinders 451 to 453. The dimensions of the two fixing rods 457 are set to be the same. The length of the fixing rods 457 is set to be the same as the outer diameter of the cylinder 453 having the largest inner diameter.

[0046] In the examples shown in Figures 10 and 11, for example, two cylindrical fixing rods 457 are welded together in a cross shape to form a single unit. Alternatively, a single fixing rod 457 may be used to fix multiple cylinders 451 to 453 that are stacked concentrically. The ends of each fixing rod 457 may also be joined to the inner surface of the cylindrical portion 410. Furthermore, the number of cylinders that are stacked concentrically in the third example of the rectifier member 45 is not limited to three; it may be two or four or more. In addition, the inner surface of the cylindrical portion 410 and the outer surface of the cylinder 453 of the third example of the rectifier member 45 are not in contact, and a predetermined gap may be provided between the inner surface of the cylindrical portion 410 and the outer surface of the cylinder 453 of the third example of the rectifier member 45 as a water passage hole.

[0047] In the manufacturing of the front piping 41C, for example, a predetermined metal component (such as SUS) is used to produce cylinders 451, 452, and 453, each with a different inner diameter, by hot rolling or hot extrusion. The inner diameter of cylinder 453 is larger than that of cylinder 452, and the inner diameter of cylinder 452 is larger than that of cylinder 451. For example, the outer diameter of cylinder 453 is set to be slightly smaller than the inner diameter J of the cylindrical section 410. Also, the lengths of cylinders 451, 452, and 453 in the Y-axis direction are set to be the same, for example. Then, predetermined intervals are provided between cylinder 451 and cylinder 452, and between cylinder 452 and cylinder 453 in concentric circles centered on the centers of cylinders 451 to 453, and these intervals are designated as water passage holes 452a to 453a, resulting in a state where multiple cylinders 451 to 453 are stacked on top of each other. Furthermore, the predetermined interval, i.e., the width between water passage holes 452a and 453a, is equal to the partition dimension dc.

[0048] Furthermore, a cross-shaped fixing rod 457 is joined to one end and the other end of the multiple concentrically stacked cylinders 451 to 453 by welding or the like. Alternatively, two fixing rods 457 formed in a cross shape may be joined by welding to only one end or only the other end of the multiple concentrically stacked cylinders 451 to 453. This forms a third example of a flow straightening member 45 in which cylinders 451 to 453 are stacked and fixed in a concentric manner by the cross-shaped fixing rod 457 with a predetermined partition dimension dc between them. The flow straightening member 45 is then inserted into the cylindrical portion 410 by being pushed along the extending direction of the cylindrical portion 410, and as shown in Figures 10 and 11, the flow straightening member 45 is fitted into the cylindrical portion 410 and fixed to it. That is, in the illustrated example, cylinder 453 is fitted into the cylindrical portion 410. In the illustrated example, the inner diameter of cylinder 451 is set to the same value as the partition dimension dc. Therefore, the internal flow path of the cylindrical section 410 is divided into three sections: a water passage hole 451a inside cylinder 451 with a circular cross-section and partition dimension dc; a water passage hole 452a with a circular cross-section and partition dimension dc between the outer surface of cylinder 451 and the inner surface of cylinder 452; and a water passage hole 453a with a circular cross-section and partition dimension dc between the outer surface of cylinder 452 and the inner surface of cylinder 453. In addition, the two fixed rods 457 joined in a cross shape to the flow straightening member 45 are perpendicular to cylinders 451 and 453, respectively.

[0049] The length K3 of the front pipe 41C shown in Figure 10 is set based on the partition dimension dc of the flow straightening member 45 of the third example. That is, in order for the front pipe 41C equipped with the flow straightening member 45 of the third example to perform the flow straightening function of the treated water W, the length K3 of the front pipe 41C is set to, for example, 10 × dc. However, the length K3 of the front pipe 41C may be set to a length greater than 10 times the partition dimension dc.

[0050] In the third example, the rectifier member 45 is arranged within the front pipe 41C so as to extend from one end to the other in the extending direction (Y-axis direction) of the front pipe 41C. That is, in the example shown in Figure 10, the total length in the Y-axis direction of the rectifier member 44, which comprises two cross-shaped fixing rods 457 and cylinders 451 to 453, is the same as, or approximately the same as, the length K3 of the front pipe 41C in the Y-axis direction.

[0051] For example, when one end of the tapered pipe 46 shown in Figure 12 is connected to the downstream side in the direction of flow of treated water W in the pre-strainer 31 shown in Figure 2, a pre-pipe 41C equipped with a flow straightening member 45 of the third example may be connected to the other end of the tapered pipe 46. The tapered pipe 46 shown in Figure 12 has, for example, an inner diameter at the other end on the opposite side (+Y direction) of the pre-strainer 31 that is connected to the pre-strainer 31, which is larger than the inner diameter at the other end on the -Y direction side, and is used to increase the flow rate of treated water W after it has passed through the pre-strainer 31.

[0052] The tapered pipe 46 is provided with, for example, a flange portion 460 extending radially on the other end in the +Y direction, and bolt holes (not shown) are formed in the flange portion 460. The flange portion 460 of the tapered pipe 46 and the mounting flange 411 of the front pipe 41C shown in Figure 13 are connected by fixing bolts (not shown), and the tapered pipe 46 and the front pipe 41C are in communication. Also, as shown in Figure 13, the center of the flow path cross-section of the tapered pipe 46 and the center of the flow path cross-section of the cylindrical portion 410 of the front pipe 41C (the center of the water passage hole 451a) are approximately aligned.

[0053] The treated water W flowing from the front strainer 31 shown in Figure 2 into the tapered pipe 46 shown in Figure 13 may generate vortices or turbulence because the flow velocity in the region near the center of the tapered pipe 46 is faster than the flow velocity in the region near the radially outer side of the tapered pipe 46. However, by connecting a front pipe 41C equipped with a flow straightening member 45 of the third example to the downstream side, the vortices and turbulence of the treated water W can be eliminated. Alternatively, a front pipe 41A equipped with a flow straightening member 43 of the first example shown in Figure 6, or a front pipe 41B equipped with a flow straightening member 44 of the second example shown in Figure 8, may be connected to the tapered pipe 46.

[0054] The following describes the process of sterilizing, disinfecting, or inactivating treated water W using the ultraviolet irradiation equipment 1 shown in Figure 2, and also explains the function of each component of the ultraviolet irradiation equipment 1. First, the treated water W filtered in the activated carbon filter tank in step S3 shown in Figure 1 passes through the flow meter 30 shown in Figure 2 and flows into the pre-strainer 31. The flow meter 30 mainly measures the flow rate of the treated water W flowing into the ultraviolet irradiation equipment 1 so as not to exceed the treatment capacity of the treated water W in the reaction tank 2 for disinfection, etc.

[0055] Furthermore, for example, if the treatment of treated water W continues in the ultraviolet irradiation equipment 1, sand, stones, etc. will accumulate in the mesh of the pre-strainer 31, causing it to lose its function as a filter. As a result, the flow meter 30 will detect that the pressure inside the ultraviolet irradiation equipment 1 has increased and exceeded the permissible value. When the flow meter 30 detects that the pressure inside the ultraviolet irradiation equipment 1 has increased and exceeded the permissible value, an alarm means (not shown) may warn the operator that, for example, the pre-strainer 31 needs to be replaced or maintained.

[0056] The pre-strainer 31, which the treated water W passes through after passing through the flow meter 30, primarily removes stones and sand from the treated water W that has passed through the activated carbon filtration in step S3 shown in Figure 1. This prevents the stones and sand from flowing into the reaction tank 2, thus preventing damage to the protective tube 221 and ultraviolet lamp 225 of the reaction tank 2 shown in Figure 4 due to the stones and sand. Here, the treated water W may have turbulence, eddies, or uneven flow after passing through the pre-strainer 31.

[0057] The treated water W, which has turbulent, eddy, or uneven flow after passing through the pre-strainer 31, flows from the -Y direction to the +Y direction along the multiple water passage holes 432 of the first example of the flow straightening member 43 of the pre-piping 41A shown in Figure 6, and is straightened into a laminar flow before flowing into the reaction tank 2 from the water inlet 200 shown in Figure 5, which is connected to the pre-piping 41A. The treated water W then flows through the reaction tank 2 towards the drain outlet 202, and the ultraviolet light 227 irradiated from the ultraviolet lamp 225 housed in the protective pipe 211 sterilizes, disinfects, or inactivates bacteria and other microorganisms contained in the treated water W. The treated water W is then discharged from the drain outlet 202. Subsequently, the treated water W passes through the post-piping 42 equipped with the first example of the flow straightening member 43 shown in Figure 2, the post-strainer 32, and the emergency shut-off valve 50 in sequence, and is discharged from the ultraviolet irradiation equipment 1 to the chlorine injection tank in step S5.

[0058] The ultraviolet irradiation equipment 1 of this embodiment is provided with a pre-pipe 41A that is installed between the pre-strainer 31 and the water inlet 200 of the reaction tank 2, and into which a flow straightening member 43, for example, as in the first example, extends to regulate the flow of treated water W. Therefore, treated water W, which has turbulence, uneven flow, or eddy flow after passing through the pre-strainer 31, can be converted into laminar flow within the pre-pipe 41A before flowing into the reaction tank 2. Thus, it is possible to prevent the ultraviolet lamp 225 and protective tube 211 of the ultraviolet irradiation member 22 installed in the reaction tank 2 from being damaged by the turbulence or eddy flow of the treated water W.

[0059] Furthermore, the ultraviolet irradiation equipment 1 of this embodiment is positioned between the rear strainer 32 and the drain port 202 of the reaction tank 2, and includes a rear pipe 42 into which a flow straightening member 43, for example, the first example, extends to regulate the flow of treated water W. Therefore, for example, when the flow of treated water W in the ultraviolet irradiation equipment 1 is temporarily stopped, the treated water W, which has turbulence or vortices after passing through the rear strainer 32, can be converted into a laminar flow within the rear pipe 42 before flowing into the reaction tank 2. This prevents the ultraviolet lamp 225 and protective tube 211 of the ultraviolet irradiation member 22 installed in the reaction tank 2 from being damaged by the turbulence or vortices of the treated water W. This effect can also be obtained when the rear pipe 42 is equipped with a flow straightening member 44, the second example shown in Figure 8, or a flow straightening member 45, the third example shown in Figure 10, instead of the flow straightening member 43, the first example shown in Figure 6.

[0060] The first example of the flow straightening member 43 shown in Figure 6 comprises a plurality of partition plates 431 extending along the extending direction of the front pipe 41A, and hexagonal water passage holes 432 partitioned by the partition plates 431. Multiple water passage holes 432 are arranged without gaps within the front pipe 41A in the radial and circumferential directions of the front pipe 41A. In other words, the first example of the flow straightening member 43 has a so-called honeycomb structure. Therefore, the first example of the flow straightening member 43 has the property of being resistant to distortion in the X-axis and Z-axis directions perpendicular to the flow direction of the treated water W (Y-axis direction). Thus, even if the treated water W flows into the front pipe 41A in a state of turbulence or vortex after passing through the front strainer 31, deformation due to the water pressure of the treated water W is prevented.

[0061] If the pre-pipe 41A shown in Figure 6 is not equipped with the first example of a flow straightening member 43, the length of the pre-pipe 41A without the flow straightening member 43 would need to be, for example, 10 times or more the inner diameter J of the cylindrical section 410 in order to eliminate turbulence and vortices in the treated water W within the pre-pipe 41A and create a laminar flow (to perform the flow straightening function). Therefore, the overall size of the ultraviolet irradiation equipment 1 shown in Figure 2 would increase, leading to an increase in the installation area. In contrast, the pre-pipe 41A of the ultraviolet irradiation equipment 1 in this embodiment is equipped with the first example of a flow straightening member 43, making it possible to set the length of the pre-pipe 41A to a significantly shorter length K1 compared to the length when the flow straightening member 43 is not equipped. In other words, by dividing the circular internal flow path of the cylindrical section 410 into multiple hexagonal water passages 432 by multiple partition plates 431, the treated water W inside the front pipe 41A is divided into each water passage 432 and passes along each water passage 432 which extends parallel to the Y-axis direction. As a result, vortices and turbulence in the treated water W within each water passage 432 are eliminated, resulting in laminar flow. Therefore, even if the length of the front pipe 41A is significantly shorter than the length without the flow straightening member 43, the flow straightening function for the treated water W passing through the front pipe 41A can still be achieved.

[0062] For example, by defining the partition dimension da as the distance between one partition plate 431 that forms the hexagonal water passage hole 432 of the straightening member 43 in the first example above and another partition plate 431 that is opposite to the first partition plate 431 with the center of the water passage hole 432 in between, and setting the length K1 = 10 × da of the front pipe 41A, the front pipe 41A can fully perform its straightening function for the treated water W that passes through it.

[0063] This description will now explain a case in which the ultraviolet irradiation equipment 1 of this embodiment is equipped with a front pipe 41B equipped with a second example of a flow straightening member 44, as shown in Figure 8, between the front strainer 31 shown in Figure 2 and the water inlet 200, instead of the front pipe 41A equipped with the first example of a flow straightening member 43 shown in Figure 6. The flow straightening member 44 has a structure in which a plurality of square water passage holes 442 formed by partition plates 441 are arranged without gaps in the radial and circumferential directions of the front pipe 41B. Therefore, it has the property of being resistant to distortion in the X-axis and Z-axis directions which are perpendicular to the flow direction (Y-axis direction) of the treated water W that flows into the front pipe 41B in a state of turbulence or vortex, and thus is prevented from deforming due to the water pressure received from the treated water W.

[0064] Furthermore, by dividing the circular internal flow path of the cylindrical section 410 into multiple square water passages 442 by multiple partition plates 441, the treated water W is divided into each water passage 442 within the front pipe 41B and passes along each water passage 442 that extends parallel to the Y-axis direction. As a result, vortices and turbulence in the treated water W disappear within each water passage 442. Therefore, even if the length of the front pipe 41B is significantly shorter than the length without the flow straightening member 44, the front pipe 41B can still perform a flow straightening function for the treated water W passing through it.

[0065] For example, by defining the distance between one partition plate 441 forming the square water passage hole 442 of the rectifying member 44 in the second example above and another partition plate 441 facing the first partition plate 441 across the center of the water passage hole 442 as the partition dimension db, and setting the length of the front pipe 41B to K2 = 10 × da, it becomes possible to fully perform the rectifying function for the treated water W passing through the front pipe 41B.

[0066] This explanation describes a case in which the ultraviolet irradiation equipment 1 of this embodiment is equipped with a pre-pipe 41C equipped with a third example of a flow straightening member 45, as shown in Figure 10, between the pre-strainer 31 shown in Figure 2 and the water inlet 200, instead of the pre-pipe 41A equipped with the first example of a flow straightening member 43 shown in Figure 6. The circular internal flow path of the cylindrical section 410 shown in Figure 10 is divided into three water passages 451a to 453a by a plurality of cylinders 451 to 453. Therefore, the treated water W is divided into the respective water passages 451a to 453a within the pre-pipe 41C and passes along the water passages 451a to 453a that extend parallel to the Y-axis direction, so that vortices and turbulence of the treated water W disappear within the water passages 451a to 453a. Therefore, even if the length of the pre-pipe 41C is significantly shorter than the length when the flow straightening member 45 is not provided, the pre-pipe 41C can still perform a flow straightening function for the treated water W passing through it.

[0067] For example, by setting the distance between cylinder 451 and cylinder 452 (water passage hole 452a) and the distance between cylinder 452 and cylinder 453 (water passage hole 453a) of the flow straightening member 45 in the third example above as partition dimensions dc, and setting the length K3 of the front pipe 41C to 10 × dc, the front pipe 41C can fully perform its flow straightening function for the treated water W through which it passes.

[0068] As the treated water W passes through the pre-pipe 41C shown in Figure 10, a water pressure greater than the water pressure acting on the multiple cylinders 451 to 453 is exerted on the fixing rod 457 within the pre-pipe 41C. Therefore, to prevent the fixing rod 457 from being damaged by vibration due to the turbulence or eddy flow of the treated water W passing through the pre-pipe 41C, for example, its diameter D0 is set to satisfy the following equation (1). Converted flow velocity (standard) Vr=U / (fn×D0)<1...(1) D0: Diameter (cross-sectional diameter) of fixing rod 457 Average standard flow velocity U=Qmax / Sd Qmax: Maximum flow rate Sd: Flow channel cross-sectional area Natural frequency fn=(λ 2 ) / (2πL 2 ) × (EI / (m + mw)) 1 / 2 Eigenvalue λ=3.1415 Length of fixing rod 457: L Young's modulus of the material of fixing rod 457: E Second moment of area of fixing rod 457 I=π(D0 4 ) / 64 Mass per unit length of fixing rod 457 m=S×ρs Cross-sectional area of fixing rod 457 S=π(D0 / 2) 2 Density of fixing rod 457: ρs Displaced mass per unit length mw=Sw×ρw Displaced area Sw=π(D0 / 2) 2 Water density: ρw

[0069] Hereinafter, it will be described whether the condition of formula (1) is satisfied when: the length L of one fixing rod 457 shown in FIG. 10 is 0.7 m, the material of the fixing rod 457 is SUS316L (austenitic stainless steel), the reference flow rate Q is 50000 m 3 / day, the maximum flow rate Qmax is 100000 m 3 / day, and the diameter D0 of the fixing rod 457 is 28.5 mm.

[0070] D0: Diameter of the fixing rod = 28.5 mm = 0.0285 m Length of fixing rod 457: L = 700 mm = 0.7 m Young's modulus of the material of fixing rod 457: E = 201000 N / mm 2 [MPa] = 201000000000 N / m 2 [Pa] Density of fixing rod 457: ρs = 8000 kg / m 3 Cross-sectional area of fixing rod 457 S = π(D0 / 2) 2 = 0.00063794 m 2 Mass per unit length of fixing rod 457 m = S×ρs = 5.103517266 kg / m Second moment of area of fixing rod 457 I=π(D0 4 ) / 64 = 3.24×10 -8 Water density: ρw = 996.66 Kg / m3 (290K, 0.1MPa conditions) Exclusion area Sw=π(D0 / 2) 2 =0.00063794m 2 Exclusion mass per unit mw = Sw × ρw = 0.63580894 kg / m Eigenvalue λ = 3.1415 (Formulas for natural frequency and modeshape, RDBlevins, Krieger Publishing company) Natural frequency fn=(λ 2 ) / (2πL 2 ) × (EI / (m + mw)) 1 / 2 =107.9607867Hz Standard flow rate Q=50000m 3 / day=0.578703704m 3 / s Maximum flow rate Qmax=100000m 3 / day = 1.157407407m 3 / s The inner diameter J of the cylindrical part 410 is 0.7 m (same as the length L of the fixing rod 457). The cross-sectional area Sd of the cylindrical part 410 = 0.3848451 m² 2 Average standard flow velocity U=Qmax / Sd=1.503731511m / s Average maximum flow velocity Umax=3.007463021m / s Converted flow velocity (standard) Vr=0.4887192 Converted flow velocity (maximum) Vr=0.9774384

[0071] The converted velocity (reference) Vr obtained in this way at the reference flow rate Q (average reference flow velocity U) is Vr = U / (fn × D0) = 0.4887192, which is less than 1. Also, the converted velocity (maximum) Vr at the maximum flow rate Qmax (average maximum flow velocity Umax) is Vr = U / (fn × D0) = 0.9774384, which is less than 1. Therefore, equation (1) is satisfied. In other words, the occurrence of vibration fracture of the fixed rod 457 due to the treated water W is suppressed.

[0072] For example, the reaction tank 2 shown in Figures 2 to 5 may be equipped with a first example of a flow straightening member 43 to prevent damage to the ultraviolet irradiation member 22 due to the uneven flow, turbulence, or eddies of the treated water W generated by the pre-strainer 31, which is a piece of equipment positioned in front of the water inlet 200. That is, instead of connecting the pre-piping 41A equipped with the first example of a flow straightening member 43 shown in Figure 6 to the flange portion 200a of the water inlet 200 of the reaction tank 2 shown in Figure 3, the first example of a flow straightening member 43 may be installed inside the water inlet 200. Alternatively, a second example of a flow straightening member 44 or a third example of a flow straightening member 45 may be installed inside the water inlet 200 instead of the first example of a flow straightening member 43. In this case as well, treated water W that has been made into laminar flow by eliminating turbulence, uneven flow, or eddies can be introduced into the reaction tank 2. Therefore, it is possible to prevent the ultraviolet lamp 225 and protective tube 211 of the ultraviolet irradiation member 22 installed in the reaction tank 2 from being damaged by turbulence or eddies in the treated water W. Similarly, instead of connecting a post-pipe 42 equipped with the flow straightening member 43 of the first example, the flow straightening member 44 of the second example, or the flow straightening member 45 of the third example to the drain port 202 of the reaction tank 2, the flow straightening member 43 of the first example, the flow straightening member 44 of the second example, or the flow straightening member 45 of the third example may be installed inside the drain port 202.

[0073] Although embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of symbols]

[0074] 1: Ultraviolet irradiation equipment 2: Reaction vessel 20: Housing 200: Water supply port 202: Drain port 22: UV irradiation component 221: Protective tube 225: UV lamp 30:Flowmeter 31: Front Strainer 32: Rear Strainer 41A: Pre-piping with the first example of a flow straightening member 41B: Pre-piping with a second example of a flow straightening member 41C: Pre-piping with a flow straightening member, third example 42: Rear piping 43: First example of a flow straightening member 431: Partition plate 432: Regular hexagonal water passage hole 44: Flow straightening member of the second example 442: Partition plate 442: Square water passage hole 45: Third example of a flow straightening member 451, 452, 453: Cylinder 451a, 452a, 453a: Water hole 457: Fixed bar 50: Emergency shutoff valve

Claims

1. A reaction tank having a water inlet for supplying treated water to be treated, a drain outlet for draining the treated water, and an ultraviolet irradiation member for irradiating ultraviolet light, wherein the treated water is passed through in the direction from the water inlet to the drain outlet while ultraviolet light is irradiated onto the treated water from the ultraviolet irradiation member, Equipment components positioned in front of the water inlet of the reaction tank, The system comprises a pipe positioned between the equipment component and the water inlet, with a flow straightening member extending inside to regulate the flow of the treated water, The flow straightening member comprises a plurality of partition plates extending along the direction of extension of the piping, and hexagonal water passages partitioned by the partition plates, wherein a plurality of these water passages are formed within the piping, arranged without gaps in the radial and circumferential directions of the piping. Ultraviolet irradiation equipment for sterilization, disinfection, or inactivation treatment of the treated water.

2. A reaction tank having a water inlet for supplying treated water to be treated, a drain outlet for draining the treated water, and an ultraviolet irradiation member for irradiating ultraviolet light, wherein the treated water is passed through in the direction from the water inlet to the drain outlet while ultraviolet light is irradiated onto the treated water from the ultraviolet irradiation member, Equipment components positioned after the drain port of the reaction tank, The system comprises a pipe positioned between the equipment component and the drain outlet, with a flow straightening member extending inside to regulate the flow of the treated water, The flow straightening member comprises a plurality of partition plates extending along the direction of extension of the piping, and hexagonal water passages partitioned by the partition plates, wherein a plurality of these water passages are formed within the piping, arranged without gaps in the radial and circumferential directions of the piping. Ultraviolet irradiation equipment for sterilization, disinfection, or inactivation treatment of the treated water.

3. A reaction tank having a water inlet for supplying treated water to be treated, a drain outlet for draining the treated water, and an ultraviolet irradiation member for irradiating ultraviolet light, wherein the treated water is passed through in the direction from the water inlet to the drain outlet while ultraviolet light is irradiated onto the treated water from the ultraviolet irradiation member, Equipment components positioned in front of the water inlet of the reaction tank and behind the drain outlet of the reaction tank, The system includes piping positioned between the equipment component located in front of the water inlet and the water inlet, and between the equipment component located behind the drain outlet and the drain outlet, with a flow straightening member extending inside for regulating the flow of the treated water. The flow straightening member comprises a plurality of partition plates extending along the direction of extension of the piping, and hexagonal water passages partitioned by the partition plates, wherein a plurality of these water passages are formed within the piping, arranged without gaps in the radial and circumferential directions of the piping. Ultraviolet irradiation equipment for sterilization, disinfection, or inactivation treatment of the treated water.

4. The partition dimension is defined as the distance between one partition plate that forms the hexagonal water passage hole of the rectifying member and another partition plate that faces the center of the water passage hole, The ultraviolet irradiation equipment according to any one of claims 1 to 3, wherein the length of the piping is 10 times or more the length of the partition dimension.

5. An ultraviolet irradiation device that performs sterilization, disinfection, or inactivation treatment on water to be treated, A water inlet for supplying the treated water, A drain outlet for discharging the treated water, A UV irradiation member that irradiates the treated water with ultraviolet light, The system includes a flow straightening member for preventing damage to the ultraviolet irradiation member due to uneven, turbulent, or eddy currents of the treated water generated by equipment components positioned in front of the water inlet or behind the drain outlet, The flow straightening member comprises a plurality of partition plates extending in the direction from the water inlet to the drain outlet, and a regular hexagonal water passage hole partitioned by the partition plates, and is disposed inside at least one of the water inlet or the drain outlet, with a plurality of the water passage holes arranged without gaps inside the outlet in the radial and circumferential directions of that outlet.

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