Ultraviolet irradiation apparatus and water treatment system

Abstract

To provide a water treatment system capable of efficiently sterilizing water to be treated.SOLUTION: The water treatment apparatus includes a hollow apparatus body into which water to be treated flows from one end side in a longitudinal direction, a light source that irradiates the water to be treated flowing into the apparatus body with ultraviolet rays, and a fluid machine that rotates by a force of the water to be treated flowing into the apparatus body and supplies the water to be treated flowing into the apparatus body toward the other end side in the longitudinal direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to an ultraviolet irradiation device and a water treatment system. [Background technology]

[0002] In water purification plants, for example, water purification equipment is used to produce purified water (hereinafter also referred to as treated water) by performing various processes on raw water such as river water or well water (hereinafter also referred to as water to be treated) (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-140380 Summary of the Invention [Problem to be solved by the invention]

[0004] The water purification facility described above includes, for example, an ultraviolet irradiation device that sterilizes the water to be treated by irradiating the water with ultraviolet rays. In the water purification facility described above, it is desirable to efficiently sterilize the water to be treated by using, for example, the ultraviolet irradiation device. [Means for solving the problem]

[0005] The ultraviolet irradiation device disclosed herein comprises a hollow device body into which the water to be treated flows from one end in the longitudinal direction, a light source that irradiates the water to be treated that has flowed into the device body with ultraviolet light, and a fluid machine that rotates due to the force of the water to be treated flowing into the device body and supplies the water to be treated that has flowed into the device body toward the other end in the longitudinal direction. [Effects of the Invention]

[0006] According to the ultraviolet irradiation device and water treatment system of the present disclosure, it is possible to efficiently sterilize the water to be treated. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating the configuration of a water treatment system 1000 according to the first embodiment. [Figure 2] FIG. 2 is a diagram illustrating the configuration of the ultraviolet irradiation device 70 according to the first embodiment. [Figure 3] FIG. 3 is a diagram illustrating the configuration of the ultraviolet irradiation device 70 according to the first embodiment. [Figure 4] FIG. 4 is a diagram illustrating the configuration of the ultraviolet irradiation device 70 according to the first embodiment. [Figure 5] FIG. 5 is a diagram illustrating the configuration of the ultraviolet irradiation device 70 according to the first embodiment. [Figure 6] FIG. 6 is a diagram illustrating a configuration example of a water treatment system 1000 according to the first embodiment. [Figure 7] FIG. 7 is a diagram illustrating the hardware configuration of the control device 200 in the first embodiment. [Figure 8] FIG. 8 is a flowchart illustrating the ultraviolet irradiation method according to the first embodiment. [Figure 9] FIG. 9 is a diagram illustrating the configuration of an ultraviolet irradiation device 70 in the first modified example. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, such descriptions should not be interpreted in a limiting sense, and do not limit the subject matter described in the claims. Furthermore, various changes, substitutions, and modifications can be made without departing from the spirit and scope of the present disclosure. Furthermore, different embodiments can be combined as appropriate.

[0009] [Water treatment system 1000 according to the first embodiment] First, a configuration example of a water treatment system 1000 according to the first embodiment will be described. Fig. 1 is a diagram illustrating a configuration example of a water treatment system 1000 according to the first embodiment. Note that the positions and numbers of pumps and pipes in the following example are merely examples and are not limited to these.

[0010] The water treatment system 1000 is, for example, a facility that produces treated water by performing water purification treatment on water to be treated.

[0011] Specifically, as shown in FIG. 1, the water treatment system 1000 includes, for example, a gritification basin 10, a receiving well 20, a mixing basin 30, a flocculation basin 40 (hereinafter also referred to as simply the flocculation basin 40), a sedimentation basin 50, a filtration basin 60, an ultraviolet irradiation device 70 (hereinafter also referred to as the irradiation device 70), a purified water basin 80, a distribution basin 90, a pump P1, and a pump P2.

[0012] The pump P1 is, for example, a pump provided in a pipe connecting a river or the like to the settling basin 10. Specifically, the pump P1 supplies the water to be treated taken from the river or the like to the settling basin 10.

[0013] The settling basin 10 is a tank into which the untreated water (untreated water taken from a river, etc.) supplied by the pump P1 first flows, and is a tank in which sedimentation and removal of sediment and the like contained in the untreated water is performed.

[0014] The receiving well 20 is, for example, a tank that adjusts the amount of water to be treated supplied from the settling basin 10 and supplies it to the mixing basin 30.

[0015] The mixing basin 30 is, for example, a tank in which a flocculant is injected into the water to be treated supplied from the receiving well 20 .

[0016] The flocculation basin 40 is a tank that, for example, agitates the water to be treated supplied from the mixing basin 30, thereby flocculating suspended solids contained in the water to be treated supplied from the mixing basin 30 with a coagulant to form flocs.

[0017] The settling basin 50 is, for example, a tank in which flocs contained in the water to be treated supplied from the flocculation basin 40 are allowed to settle and separated from the water to be treated.

[0018] The filtration basin 60 is a tank that filters the water to be treated supplied from the settling basin 50 by using a filter body (not shown) made of, for example, sand, gravel, or the like.

[0019] The ultraviolet irradiation device 70 sterilizes the water to be treated supplied from the filtration basin 60 via the pipe L1, for example, by irradiating it with ultraviolet rays. The pipe L1 is, for example, a pipe that connects the filtration basin 60 and the ultraviolet irradiation device 70.

[0020] The purified water reservoir 80 is a tank that temporarily stores the water to be treated (e.g., water to be treated after being disinfected by chlorine downstream of the ultraviolet irradiation device 70) supplied from the ultraviolet irradiation device 70 via the pipe L2 and supplies the water to the distributing reservoir 90. The pipe L2 is, for example, a pipe that connects the ultraviolet irradiation device 70 and the purified water reservoir 80.

[0021] The pump P2 is, for example, a pump provided in a pipe connecting the purified water reservoir 80 and the distributing reservoir 90. Specifically, the pump P2 supplies the water to be treated (treated water) from the purified water reservoir 80 to the distributing reservoir 90, for example.

[0022] The distributing reservoir 90 temporarily stores the water to be treated (treated water) supplied from the purified water reservoir 80, for example, and supplies it to homes and the like (not shown).

[0023] The following description will be given of a case where the ultraviolet irradiation device 70 is a downstream equipment of the filtration basin 60 and an upstream equipment of the purified water basin 80, but the present invention is not limited to this. Specifically, the ultraviolet irradiation device 70 may be disposed in another position in the water treatment system 1000, for example.

[0024] In addition, the following description will be given assuming that the ultraviolet irradiation device 70 is included in the water treatment system 1000 that purifies the water to be treated, but the present invention is not limited to this. Specifically, the ultraviolet irradiation device 70 may be, for example, a device that receives direct supply of the water to be treated (e.g., groundwater). The ultraviolet irradiation device 70 may also sterilize the water to be treated that is directly supplied.

[0025] [Ultraviolet Irradiation Device 70 in the First Embodiment] Next, the configuration of the ultraviolet irradiation device 70 in the first embodiment will be described. Figs. 2 to 5 are diagrams for explaining an example of the configuration of the ultraviolet irradiation device 70 in the first embodiment. Specifically, Fig. 2 is a perspective view of the ultraviolet irradiation device 70. Fig. 3 is a side view of the ultraviolet irradiation device 70. Fig. 4 is a perspective view of the rotating shaft 75 and the turbine 76. Fig. 5 is a side cross-sectional view of the ultraviolet irradiation device 70.

[0026] In the following description, the X-axis direction is assumed to be the horizontal direction, but this is not limiting. Specifically, the X-axis direction may be tilted at a predetermined angle from the horizontal direction.

[0027] As shown in Figures 2 to 5, the ultraviolet irradiation device 70 has, for example, a device main body 71, an inlet pipe 72, a light source 73, an outlet pipe 74, a rotating shaft 75, and a turbine 76 (hereinafter also referred to as a fluid machine).

[0028] The device body 71 has, for example, a hollow cylindrical shape extending along the X-axis direction (horizontal direction), and accommodates therein the water to be treated supplied from the filtration tank 60. Below, a case where the device body 71 has a hollow cylindrical shape will be described, but the device body 71 may have, for example, a shape other than a hollow cylindrical shape (for example, a hollow rectangular parallelepiped shape, etc.).

[0029] The inflow pipe 72 is, for example, a pipe having one end that is located on the X2 direction side (one end side in the horizontal direction) of the side surface (side wall) of the device main body 71 and communicates with a position on the Z1 direction side (vertically upward side). The other end of the inflow pipe 72 is, for example, a pipe that communicates with the pipe L1.

[0030] That is, as shown by the solid arrow in FIG. 5, the inflow pipe 72 is a pipe that can supply the water to be treated supplied from a previous stage facility (for example, the filtration tank 60) via a pipe L1 into the device main body 71.

[0031] Note that, although the following description will be given assuming that the inflow pipe 72 is attached to the device body 71 at a position on the Z1 direction side of the side surface of the device body 71, this is not limiting. Specifically, the inflow pipe 72 may be attached to the side surface of the device body 71 at a position inclined at a predetermined angle from the Z1 direction toward the Y-axis direction (Y1 direction or Y2 direction), for example.

[0032] In addition, the following description will be given of a case where the inflow pipe 72 is attached to the center position in the Y-axis direction on the side surface of the device body 71, but this is not limiting. Specifically, the inflow pipe 72 may be attached to a position other than the center in the Y-axis direction on the side surface of the device body 71 (a position on the Y1 direction side or a position on the Y2 direction side), for example.

[0033] The light source 73 is attached, for example, to an end surface on the X1 direction side (the other end side in the horizontal direction) of the device body 71, and irradiates ultraviolet light toward the X2 direction side within the device body 71. That is, the light source 73 irradiates ultraviolet light onto the water to be treated that has flowed into the device body 71 from the inflow pipe 72, for example. Specifically, the light source 73 is, for example, a UV-LED (Ultra Violet Light Emitting Diode).

[0034] Specifically, the light source 73 is attached, for example, to the surface on the X2 direction side of the end face on the X1 direction side of the device body 71. Note that if the end face on the X1 direction side of the device body 71 is made of a material that is transparent to ultraviolet light, the light source 73 may be attached, for example, to the surface on the X1 direction side of the end face on the X1 direction side of the device body 71.

[0035] The outflow pipe 74 is, for example, a pipe having one end that is located on the X1 direction side and communicates with a position on the Z1 direction side of the side surface (side wall) of the device main body 71. The other end of the outflow pipe 74 is, for example, a pipe that communicates with the pipe L2.

[0036] That is, as shown by the solid arrow in Figure 5, the outflow pipe 74 is, for example, a pipe that can supply treated water within the device main body 71 (treated water after being irradiated with ultraviolet rays within the device main body 71) to downstream equipment (for example, purified water reservoir 80).

[0037] Note that, although the following description will be given assuming that the outflow pipe 74 is attached to the device main body 71 at a position on the Z1 direction side of the side surface of the device main body 71, this is not limiting. Specifically, the outflow pipe 74 may be attached to the side surface of the device main body 71 at a position inclined at a predetermined angle from the Z1 direction toward the Y-axis direction (Y1 direction or Y2 direction), for example.

[0038] In addition, the following description will be given of a case where the outflow pipe 74 is attached to the center position in the Y-axis direction on the side surface of the device main body 71, but this is not limiting. Specifically, the outflow pipe 74 may be attached to a position other than the center in the Y-axis direction on the side surface of the device main body 71 (a position on the Y1 direction side or a position on the Y2 direction side), for example.

[0039] 5, the rotation shaft 75 is, for example, arranged on the axis (X axis) of the device body 71 and is an axis that penetrates the end face on the X2 direction side of the device body 71. The rotation shaft 75 is supported in a state where it can rotate around the axis of the device body 71 by, for example, a support member (not shown) that is arranged on the outside of the device body 71 on the X2 direction side.

[0040] 4 and 5, the turbine 76 has, for example, a plurality of turbine blades 76a and is disposed within the device body 71 while being attached near the tip of the rotation shaft 75 on the X1 direction side. Specifically, the turbine 76 is disposed, for example, on the Z2 direction side (vertically downward side) of the position of the inlet pipe 72. In other words, the turbine 76 is disposed, for example, at a position where its position in the X axis direction is the same as the inflow position of the water to be treated into the device body 71.

[0041] That is, as shown by the solid arrow in Fig. 5, the turbine 76 has a structure in which, for example, the water to be treated that flows into the device body 71 from the inlet pipe 72 collides with each turbine blade 76a, causing it to rotate about the rotation axis 75. In other words, the turbine 76 has a structure in which, for example, the kinetic energy of the water to be treated that flows into the device body 71 from the inlet pipe 72 is used to rotate. The water to be treated that collides with the turbine blade 76a is then pushed out in the X1 direction, for example, in a state where it has been straightened by the rotation of the turbine 76. Specifically, the water to be treated that collides with the turbine blade 76a forms a spiral flow, for example, by the rotation of the turbine 76.

[0042] As a result, the ultraviolet irradiation device 70 in this embodiment can, for example, control the water to be treated that has flowed in from the inlet pipe 72 to move in the X1 direction inside the device body 71 while forming a spiral flow. Therefore, the ultraviolet irradiation device 70 in this embodiment can, for example, uniformize the residence time (hereinafter also simply referred to as residence time) inside the device body 71 of the water to be treated that has flowed into the device body 71 from the inlet pipe 72.

[0043] In this regard, if the ultraviolet irradiation device does not have a turbine, the flow rate of the water to be treated within the device body will vary depending on, for example, the position (position on the XY plane) at which the water to be treated flows within the device body. Specifically, the flow rate of the water to be treated flowing near the wall surface of the device body will be faster than the flow rate of the water to be treated flowing near the axis of the device body. Therefore, the retention time of the water to be treated flowing near the wall surface of the device body will be shorter than the retention time of the water to be treated flowing near the axis of the device body.

[0044] In contrast, the ultraviolet irradiation device 70 of the present embodiment can, for example, make the retention time uniform regardless of the position of the water to be treated within the device body 71. Therefore, the ultraviolet irradiation device 70 of the present embodiment can, for example, make the sterilization time (the irradiation time of ultraviolet light by the light source 73) for the water to be treated that has flowed into the device body 71 uniform, and can uniformly sterilize the water to be treated. Therefore, the ultraviolet irradiation device 70 of the present embodiment does not need to, for example, set the irradiance of ultraviolet light from the light source 73 to a high level in accordance with water to be treated that has a short retention time (for example, water to be treated that moves close to the wall of the device body 71), and can efficiently sterilize the water to be treated that has flowed into the device body 71.

[0045] As such, the ultraviolet irradiation device 70 in this embodiment has, for example, a hollow device body 71 into which the water to be treated flows from one end side (X2 direction side) in the longitudinal direction (X axis direction), a light source 73 that irradiates ultraviolet rays onto the water to be treated that has flowed into the device body 71, and a turbine 76 that rotates due to the force of the water to be treated flowing into the device body 71 and supplies the water to be treated that has flowed into the device body 71 toward the other end side (X1 direction side) in the longitudinal direction of the device body 71.

[0046] Specifically, in the ultraviolet irradiation device 70 of this embodiment, the light source 73 is provided, for example, at the other end side (X1 direction side) in the longitudinal direction of the device main body 71, and irradiates ultraviolet light toward one end side (X2 direction side) within the device main body 71.

[0047] In addition, the ultraviolet irradiation device 70 in this embodiment has, for example, an inlet pipe 72 that is connected to the device main body 71 at one end side (X2 direction side) in the longitudinal direction of the device main body 71 and supplies the treated water to the device main body 71, and an outlet pipe 74 that is connected to the device main body 71 at the other end side (X1 direction side) in the longitudinal direction of the device main body 71 and discharges the treated water from the device main body 71 after irradiation with ultraviolet rays.

[0048] Furthermore, in the ultraviolet irradiation device 70 of this embodiment, the turbine 76 is disposed at a position in the X-axis direction that is the same as the inflow position of the water to be treated, for example.

[0049] As a result, the ultraviolet irradiation device 70 in this embodiment can, for example, uniformize the sterilization time (the irradiation time of ultraviolet rays by the light source 73) for the water to be treated that has flowed into the device main body 71, and can uniformly sterilize the water to be treated. Therefore, the ultraviolet irradiation device 70 in this embodiment does not need to set the irradiance of ultraviolet rays from the light source 73 to a high level in accordance with the water to be treated that has a short residence time, and can efficiently sterilize the water to be treated that has flowed into the device main body 71.

[0050] Furthermore, the ultraviolet irradiation device 70 of this embodiment does not need to complicate the flow path of the water to be treated within the device body 71, for example, in order to uniformize the sterilization time for the water to be treated that has flowed into the device body 71. Therefore, the ultraviolet irradiation device 70 of this embodiment makes it possible to reduce the size of the device body 71 and also to suppress increases in costs due to an increase in the number of processing points.

[0051] Furthermore, the ultraviolet irradiation device 70 in this embodiment can automatically adjust the illuminance of ultraviolet light emitted by the light source 73. Therefore, the ultraviolet irradiation device 70 in this embodiment does not require manual adjustment of the illuminance of ultraviolet light emitted by the light source 73, and can reduce the burden on managers and workers.

[0052] In addition, in the ultraviolet irradiation device 70 of this embodiment, the inflow pipe 72 may be provided with, for example, a chamber (not shown) in which the cross-sectional area of ​​the flow path of the water to be treated is larger than that of other parts of the inflow pipe 72.

[0053] As a result, the ultraviolet irradiation device 70 in this embodiment can, for example, control the flow rate (flow rate per unit time) of the water to be treated from the inlet pipe 72 to the device body 71 so that it falls within a predetermined range. Therefore, the ultraviolet irradiation device 70 in this embodiment can, for example, stably rotate the turbine 76 regardless of the amount of water to be treated supplied from the upstream equipment (e.g., the filtration tank 60), and can stably form a spiral flow of the water to be treated in the device body 71.

[0054] Furthermore, in the above example, for example, a case has been described in which light source 73 is attached to the X1 direction side (the other end side in the horizontal direction) of device body 71, but this is not limiting. Specifically, light source 73 may be attached, for example, to a position between the attachment positions of inlet pipe 72 and outlet pipe 74 on the side surface of device body 71, and may irradiate ultraviolet light onto the water to be treated moving within device body 71. Even more specifically, light source 73 may be attached, for example, to a position on the Z1 direction side of the side surface of device body 71, and may irradiate ultraviolet light toward the Z2 direction side within device body 71.

[0055] Next, a description will be given of other configurations of the water treatment system 1000. Fig. 6 is a diagram illustrating an example of the configuration of the water treatment system 1000 in the first embodiment.

[0056] As shown in FIG. 6, the water treatment system 1000 further includes, for example, a measuring device 100 and a control device 200.

[0057] The measurement device 100 measures, for example, the rotation speed (for example, the number of rotations per unit time) of the rotating shaft 75. That is, the measurement device 100 essentially measures, for example, the rotation speed of the turbine 76.

[0058] Note that, although the following description will be given assuming that measuring device 100 measures the rotation speed of rotating shaft 75, the present invention is not limited to this. Specifically, measuring device 100 may measure, for example, the rotation acceleration of rotating shaft 75. Furthermore, measuring device 100 may be, for example, attached directly to rotating shaft 75 or turbine 76, or may not be attached to rotating shaft 75 or turbine 76.

[0059] The control device 200 performs control to adjust the illuminance of ultraviolet light from the light source 73 (hereinafter also referred to as illuminance adjustment control) in accordance with, for example, the rotation state of the rotary shaft 75 (turbine 76).

[0060] Specifically, the control device 200 controls the illuminance of the ultraviolet light from the light source 73 in accordance with the number of rotations measured by the measurement device 100 (the number of rotations of the rotation shaft 75), for example.

[0061] That is, for example, the rotation speed of the rotating shaft 75 (turbine 76) increases as the amount of water to be treated flowing into the device body 71 from the inlet pipe 72 increases. The flow rate of the water to be treated in the device body 71 increases as the amount of water to be treated flowing into the device body 71 from the inlet pipe 72 increases. Furthermore, the retention time of the water to be treated in the device body 71 decreases as the flow rate of the water to be treated in the device body 71 increases.

[0062] Therefore, for example, when the control device 200 detects an increase in the rotation speed of the rotating shaft 75, it determines that the residence time of the water to be treated within the device main body 71 will be shortened, and controls the light source 73 so that the intensity of the ultraviolet light irradiated onto the water to be treated within the device main body 71 is increased.

[0063] This allows the control device 200 to sufficiently irradiate the water to be treated with ultraviolet light, even if, for example, the amount of water to be treated flowing into the device body 71 from the inflow pipe 72 increases (if the residence time of the water to be treated in the device body 71 becomes shorter). Therefore, the control device 200 can sufficiently sterilize the water to be treated, even if, for example, the amount of water to be treated flowing into the device body 71 increases.

[0064] Furthermore, the rotation speed of the rotating shaft 75 (turbine 76) decreases, for example, as the amount of water to be treated flowing into the device body 71 from the inlet pipe 72 decreases. The flow rate of the water to be treated in the device body 71 decreases, for example, as the amount of water to be treated flowing into the device body 71 from the inlet pipe 72 decreases. Furthermore, the residence time of the water to be treated in the device body 71 increases, for example, as the flow rate of the water to be treated in the device body 71 decreases.

[0065] Therefore, for example, when the control device 200 detects a decrease in the rotation speed of the turbine 76, it determines that the residence time of the water to be treated within the device main body 71 will become longer, and controls the light source 73 so that the intensity of the ultraviolet light irradiated onto the water to be treated within the device main body 71 will be weakened.

[0066] As a result, for example, when the amount of water to be treated flowing into the device body 71 from the inflow pipe 72 decreases (when the residence time of the water to be treated in the device body 71 increases), the control device 200 can perform control so that more ultraviolet light than necessary is not irradiated onto the water to be treated flowing into the device body 71. Therefore, the control device 200 can, for example, reduce the load on the light source 73 associated with the irradiation of ultraviolet light onto the water to be treated.

[0067] [Control device 200 in the first embodiment] Next, a description will be given of the hardware configuration of the control device 200. Fig. 7 is a diagram illustrating the hardware configuration of the control device 200 in the first embodiment.

[0068] 7, the control device 200 is, for example, an electronic device having an electronic circuit. Specifically, the control device 200 is, for example, a computer device having a CPU 201 which is a processor, a memory 202, a communication device 203, and a storage medium 204. Each unit is connected to each other via a bus 205, for example.

[0069] The storage medium 204 has, for example, a program storage area (not shown) that stores a program 210 for performing illuminance adjustment control. The storage medium 204 also has, for example, an information storage area 230 that stores information used when performing illuminance adjustment control. The storage medium 204 may be, for example, a hard disk drive (HDD) or a solid state drive (SSD).

[0070] The CPU 201 performs illuminance adjustment control by executing a program 210 loaded from the storage medium 204 to the memory 202, for example.

[0071] The communication device 203 accesses an operation terminal (not shown) through which the administrator inputs necessary information, for example, via a network (not shown) such as the Internet.

[0072] The control device 200 may have, for example, an FPGA (Field Programmable Gate Array) or an ASIC (Application Specific Integrated Circuit). The control device 200 may also include, for example, a PIC (Peripheral Interface Controller). The illuminance adjustment control may be performed, for example, by the FPGA or ASIC.

[0073] [Illuminance Adjustment Control in the First Embodiment] Next, the illuminance adjustment control in the first embodiment will be described. Fig. 8 is a flowchart illustrating the illuminance adjustment control in the first embodiment. Note that, although the following description will be made on the case where the illuminance adjustment control is automatically performed by the control device 200, the present invention is not limited to this. Specifically, the illuminance adjustment control may be performed manually by an operator, for example.

[0074] As shown in Fig. 8, the control device 200 waits until the control execution time comes (NO in step S1 in Fig. 8). The control execution time may be, for example, a regular timing such as every minute. Alternatively, the control execution time may be, for example, a timing designated by an administrator.

[0075] Then, when the control execution time arrives, the control device 200 acquires, for example, information indicating the rotation state of the turbine 76 measured by the measurement device 100 (step S2 in FIG. 8). The information indicating the rotation state of the turbine 76 is, for example, the rotation speed and rotation acceleration of the turbine 76.

[0076] Thereafter, the control device 200 controls the illuminance of the ultraviolet light from the light source 73 in accordance with the information acquired in step S2, for example (step S3 in FIG. 8).

[0077] Specifically, the control device 200 performs control such that, for example, the higher the rotation speed of the turbine 76 measured by the measurement device 100, the stronger the irradiance of ultraviolet light from the light source 73. Also, the control device 200 performs control such that, for example, the lower the rotation speed of the turbine 76 measured by the measurement device 100, the weaker the irradiance of ultraviolet light from the light source 73.

[0078] Thus, the water treatment system 1000 in this embodiment includes, for example, an ultraviolet irradiation device 70, a measuring device 100 that measures the rotational state of the turbine 76, and a control device 200 that controls the illuminance of ultraviolet light from the light source 73 in accordance with the measurement results of the rotational state of the turbine 76 by the measuring device 100.

[0079] Specifically, in the water treatment system 1000 of this embodiment, the control device 200 controls the irradiance of ultraviolet light from the light source 73 so that, for example, the greater the flow rate of the water to be treated corresponding to the rotation state of the turbine 76, the stronger the irradiance of ultraviolet light from the light source 73.

[0080] In addition, in the water treatment system 1000 of this embodiment, the control device 200 controls the irradiance of ultraviolet light from the light source 73 so that, for example, the lower the flow rate of the water to be treated corresponding to the rotation state of the turbine 76, the weaker the irradiance of ultraviolet light from the light source 73 becomes.

[0081] As a result, in water treatment system 1000 of the present embodiment, control device 200 can sufficiently irradiate the water to be treated with ultraviolet rays even if, for example, the amount of water to be treated flowing from inlet pipe 72 into device body 71 increases. Therefore, control device 200 can sufficiently sterilize the water to be treated even if, for example, the amount of water to be treated flowing from inlet pipe 72 into device body 71 increases.

[0082] Furthermore, in water treatment system 1000 of the present embodiment, when the amount of water to be treated flowing from inflow pipe 72 into device body 71 decreases, control device 200 can perform control so that the water to be treated flowing from inflow pipe 72 into device body 71 is not irradiated with more ultraviolet light than necessary. Therefore, control device 200 can reduce the load on light source 73 associated with the irradiation of ultraviolet light onto the water to be treated, for example.

[0083] The control device 200 may, for example, set a lower limit value (hereinafter simply referred to as a lower limit value) for the illuminance of ultraviolet light from the light source 73. That is, the control device 200 may control the illuminance of ultraviolet light from the light source 73 so that it does not fall below the lower limit value even when, for example, the amount of water to be treated flowing from the inlet pipe 72 into the device body 71 decreases (for example, when the amount of water to be treated flowing from the inlet pipe 72 into the device body 71 becomes extremely small).

[0084] Furthermore, the control device 200 may, for example, set an upper limit value (hereinafter simply referred to as an upper limit value) for the illuminance of ultraviolet light from the light source 73. That is, the control device 200 may, for example, control the illuminance of ultraviolet light from the light source 73 so that it does not exceed the upper limit value even when the amount of water to be treated flowing into the device body 71 from the inflow pipe 72 increases.

[0085] Furthermore, for example, a motor (not shown) capable of controlling the rotation speed of the rotating shaft 75 (turbine 76) may be attached to the rotating shaft 75. Then, for example, when the amount (amount per unit time) of water to be treated flowing into the device body 71 from the inlet pipe 72 is greater than a predetermined upper threshold or less than a predetermined lower threshold, the control device 200 may operate the motor and control the frequency of an inverter (not shown) attached to the motor, thereby controlling the rotation speed of the rotating shaft 75 (turbine 76).

[0086] [Ultraviolet Irradiation Device 70 in First Modification] Next, the configuration of the ultraviolet irradiation device 70 in the first modified example will be described. Fig. 9 is a diagram illustrating an example of the configuration of the ultraviolet irradiation device 70 in the first modified example.

[0087] As shown in FIG. 9, the turbine 76 in this modified example differs from the ultraviolet irradiation device 70 in the first embodiment in that, for example, it is positioned closer to the X1 direction (toward the light source 73) than to the Z2 direction (vertically downward) of the position of the inlet pipe 72.

[0088] That is, the ultraviolet irradiation device 70 in this modified example causes, for example, a space 71a on the X2 direction side (the X2 direction side of the turbine 76) in the device main body 71 to function as a chamber. Then, the ultraviolet irradiation device 70 in this modified example rotates the turbine 76 (turbine blades 76a) by, for example, the kinetic energy of the water to be treated that has flowed into the space 71a.

[0089] As a result, even if a chamber is not provided in the inlet pipe 72, the ultraviolet irradiation device 70 in this modified example can control the flow rate (flow rate per unit time) of the water to be treated from the inlet pipe 72 to the device body 71 so that it falls within a predetermined range. Therefore, even in this case, the ultraviolet irradiation device 70 in this embodiment can stably rotate the turbine 76 regardless of the amount of water to be treated supplied from the upstream equipment (e.g., the filtration tank 60), and can stably form a spiral flow of the water to be treated from the X2 direction side to the X1 direction side within the device body 71. [Explanation of symbols]

[0090] 10: Sand pond 20: Landing well 30: Mixing basin 40: Flocculation basin 50: Sedimentation tank 60: Filtration tank 70: Ultraviolet irradiation device 71: Device body 71a: Space 72: Inflow pipe 73: Light source 74: Outflow pipe 75: Rotating shaft 76: Turbine 76a: Turbine blade 80: Clean water reservoir 90: Water reservoir 100: Measuring device 200: Control device 201: CPU 202: Memory 203: Communication device 204: Storage medium 205: Bus 210: Program 230: Information storage area 1000: Water treatment system

Claims

1. a hollow device body into which the water to be treated flows from one end in the longitudinal direction; a light source that irradiates ultraviolet light onto the water to be treated that has flowed into the device body; a fluid machine that rotates by the force of the water to be treated flowing into the device body and supplies the water to be treated that has flowed into the device body toward the other end side in the longitudinal direction; Ultraviolet irradiation device.

2. The ultraviolet irradiation device according to claim 1 , wherein the hollow shape is a hollow cylindrical shape.

3. The light source is provided on the other end side, The ultraviolet irradiation device according to claim 1 , wherein the ultraviolet light is irradiated toward the one end side within the device body.

4. The ultraviolet irradiation device according to claim 1 , wherein the fluid machine is disposed at a position in the longitudinal direction that is the same as an inflow position of the water to be treated.

5. an ultraviolet irradiation device having a hollow device body into which the water to be treated flows from one end in the longitudinal direction, a light source that irradiates the water to be treated that has flowed into the device body with ultraviolet light, and a fluid machine that rotates due to the force of the water to be treated flowing into the device body and supplies the water to be treated that has flowed into the device body toward the other end in the longitudinal direction; a measuring device for measuring a rotation state of the fluid machine; a control device that controls the irradiance of the ultraviolet light from the light source in accordance with the measurement result of the rotation state by the measurement device.

6. The water treatment system described in claim 5, wherein the control device controls the irradiance of the ultraviolet light from the light source so that the irradiance of the ultraviolet light from the light source becomes stronger the greater the flow rate of the water to be treated corresponding to the rotational state of the fluid machine.

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