WO2020004272A1 - Water treatment system - Google Patents

Water treatment system Download PDF

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Publication number
WO2020004272A1
WO2020004272A1 PCT/JP2019/024736 JP2019024736W WO2020004272A1 WO 2020004272 A1 WO2020004272 A1 WO 2020004272A1 JP 2019024736 W JP2019024736 W JP 2019024736W WO 2020004272 A1 WO2020004272 A1 WO 2020004272A1
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WIPO (PCT)
Prior art keywords
ultraviolet
treated water
water
reverse osmosis
treatment system
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Application number
PCT/JP2019/024736
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French (fr)
Japanese (ja)
Inventor
貴浩 中摩
貴弘 阿久津
Original Assignee
日機装株式会社
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Publication of WO2020004272A1 publication Critical patent/WO2020004272A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/04—Feed pretreatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis

Definitions

  • the present invention relates to a water treatment system used for, for example, medical applications.
  • Patent Literature 1 a water treatment system provided with a reverse osmosis filtration device that generates treated water by a reverse osmosis membrane (RO membrane) is known.
  • an ultraviolet sterilizing lamp ultraviolet lamp
  • a treated water tank for storing the treated water
  • the treated water in the treated water tank is sterilized by irradiating the treated water with ultraviolet rays by the ultraviolet sterilizing lamp. I have.
  • an ultraviolet germicidal lamp generally contains light having a very short wavelength (for example, a wavelength of less than 255 nm)
  • sterilizing treated water with an ultraviolet germicidal lamp destroys bacterial cells in the treated water
  • heat-resistant endotoxin called endotoxin is generated.
  • endotoxin causes heat and the like.
  • an object of the present invention is to provide a water treatment system capable of suppressing the generation of endotoxin.
  • a reverse osmosis filtration device that generates treated water by a reverse osmosis membrane, and an ultraviolet irradiation device that irradiates the treated water from the reverse osmosis filtration device with ultraviolet light
  • a water treatment system wherein the ultraviolet light irradiated by the ultraviolet irradiation device has a center wavelength of 255 nm or more and 350 nm or less and does not include light having a wavelength of less than 255 nm.
  • a water treatment system capable of suppressing the generation of endotoxin can be provided.
  • FIG. 1A is a schematic configuration diagram showing a water treatment system according to the present embodiment
  • FIG. 1B is a sectional view of an ultraviolet irradiation device.
  • a water treatment system 1 includes a raw water tank 2 for storing raw water introduced from a raw water intake 1a, an activated carbon device 3 for removing residual chlorine and the like from the raw water, and a water passing through the activated carbon device 3.
  • a water softening device 4 for softening the water a reverse osmosis filtration device (RO device) 5 supplied with water passing through the water softening device 4 and generating treated water by a reverse osmosis membrane (RO membrane), and a reverse osmosis filtration device 5
  • a treated water tank 6 for storing the treated water.
  • the treated water generated by the water treatment system 1 is used for medical applications such as blood purification treatment.
  • the raw water tank 2 is a water tank for temporarily storing raw water so that the raw water does not run short.
  • the activated carbon device 3 adsorbs and removes residual chlorine (free chlorine) and the like in raw water as a pretreatment of the reverse osmosis filtration device 5 to the activated carbon.
  • the water softener 4 has a sodium-type cation exchange resin, and ion exchanges hardness components (calcium ions and magnesium ions) in raw water that have passed through the activated carbon device 3 with sodium ions in the cation exchange resin. To soften the water.
  • the reverse osmosis filtration device 5 has a module (not shown) having a built-in reverse osmosis membrane and a pressure pump (not shown), and generates treated water by performing filtration with the reverse osmosis membrane.
  • the treated water tank 6 is a water storage tank for temporarily storing the treated water so that the treated water does not run short when the used amount of the treated water increases.
  • the treated water from the reverse osmosis filtration device 5 is temporarily stored in a treated water tank 6, and then supplied from a treated water outlet 1b to a device using treated water such as a blood purification device.
  • the water treatment system 1 further includes an ultraviolet irradiation device 7 for irradiating the treated water from the reverse osmosis filtration device 5 with ultraviolet light.
  • a circulation channel 8 having an inlet / outlet connected to the treated water tank 6 and a circulation pump 9 for causing the treated water in the treated water tank 6 to flow through the circulation channel 8 are provided.
  • the device 7 is provided in the circulation channel 8.
  • the ultraviolet irradiation device 7 has a flow path 71 through which the treated water flows, and is configured to irradiate the treated water flowing through the flow path 71 with ultraviolet light.
  • the circulation channel 8 upstream of the ultraviolet irradiation device 7 is referred to as an upstream circulation channel 8a
  • the circulation channel 8 downstream of the ultraviolet irradiation device 7 is referred to as a downstream circulation channel 8b.
  • the ultraviolet irradiation device 7 flows through a straight pipe 72 that communicates the upstream circulation flow path 8a and the downstream circulation flow path 8b and extends linearly, and a flow path 71 that is an internal space of the straight pipe 72.
  • a light source 73 for irradiating the treated water with ultraviolet light Both ends of the straight pipe 72 are inserted into the first housing 74 and the second housing 75, respectively.
  • the straight pipe 72 and the upstream circulation flow path 8a communicate with each other via a first housing 74, and the straight pipe 72 and the downstream circulation flow path 8b communicate with each other via a second housing 75. I have.
  • a window member 76 is provided so as to divide the internal space in the axial direction of the straight pipe 72, and the space 76a defined by the window member 76 has a straight pipe through the window member 76.
  • a light source 73 is provided so as to face the downstream end of the light source 72.
  • the straight tube 72 at least the inner peripheral surface thereof is preferably made of a material that reflects ultraviolet light from the light source 73 (for example, polytetrafluoroethylene or the like).
  • the window member 76 a member having a high transmittance of ultraviolet light, for example, a member made of quartz glass (SiO 2 ), sapphire glass (Al 2 O 3 ), or an amorphous fluorine-based resin can be used.
  • a plate-like reflector 77 that reflects ultraviolet light is provided in the first housing 74 so as to face the upstream end of the straight pipe 72.
  • the reflector 77 is provided on the upstream side of the straight pipe 72 so as to face the light source 73.
  • the reflector 77 reflects the ultraviolet light emitted from the light source 73 and propagating inside the straight tube 72 to the downstream side, thereby increasing the irradiation efficiency of the ultraviolet light.
  • the reflector 77 for example, mirror-polished aluminum, or a material obtained by depositing aluminum on aluminum serving as a base material and further depositing an oxide film layer can be used.
  • the specific configuration of the ultraviolet irradiation device 7 shown in FIG. 1B is merely an example, and the configuration of the ultraviolet irradiation device 7 can be appropriately changed.
  • the ultraviolet light emitted by the ultraviolet irradiation device 7 has a center wavelength of not less than 255 nm and not more than 350 nm, and does not include light having a wavelength of less than 255 nm. More specifically, in the present embodiment, a light emitting diode (LED) that emits ultraviolet light having a center wavelength of 255 nm or more and 350 nm or less and does not include light having a wavelength of less than 255 nm is used as the light source 73.
  • LED light emitting diode
  • FIG. 2 shows the spectrum distribution of the light emitting diode used as the light source 73 of the ultraviolet irradiation device 7 in this embodiment.
  • the light-emitting diode used as the light source 73 has a peak wavelength (center wavelength) of 285 nm in a 25 ° C. environment, and does not include light having a wavelength of less than 255 nm in irradiation light.
  • the reverse osmosis filtration device 5 can remove most of the bacteria contained in the raw water, it is technically very difficult to completely reduce the number of bacteria (the number of viable bacteria) contained in the treated water to zero. is there. Therefore, when the treated water is stored in the treated water tank 6 in particular, it is desired to take measures to prevent bacteria from growing during storage in the treated water tank 6. .
  • an ultraviolet germicidal lamp ultraviolet germicidal lamp
  • the ultraviolet germicidal lamp contains light having a wavelength of less than 255 nm
  • bacterial cells contained in the treated water are destroyed, and endotoxin is destroyed. Will occur.
  • Endotoxin is a general term for lipopolysaccharide present in the outer membrane of the cell wall of Gram-negative bacteria, is a heat-resistant endotoxin, and is known as a typical pyrogen.
  • the water treatment system 1 when used for medical applications such as blood purification treatment, it is necessary to separately provide a filter for removing endotoxin from the treated water, which causes an increase in cost.
  • the UV germicidal lamp contains mercury, if the UV germicidal lamp is damaged for any reason, mercury will be mixed into the treated water, and from the viewpoint of safety, it is particularly preferable when used in medical applications. I can't say that.
  • the light-emitting diode that does not include light having a wavelength of less than 255 nm is used as the light source 73 in the water to be irradiated, so that bacterial cells contained in the treated water may be destroyed. Is suppressed. Irradiation with ultraviolet light not containing light having a wavelength of less than 255 nm is considered to result in a state in which the growth ability of bacteria is suppressed, that is, a state in which bacteria are inactivated.
  • the light emitting diode that emits ultraviolet light that does not include light having a wavelength of less than 255 nm as the light source 73, the growth of bacteria can be suppressed and the increase in the concentration of endotoxin can be suppressed. become. Furthermore, since the light emitting diode does not contain mercury unlike an ultraviolet germicidal lamp, the safety is high.
  • the intensity (the amount of light, etc.) of irradiating the ultraviolet rays with the ultraviolet irradiation device 7 is too strong, bacterial cells may be destroyed.
  • the flow rate or the like may be appropriately adjusted so that the bacteria can be inactivated and the bacterial cells are not destroyed (the endotoxin concentration does not increase).
  • water simulating the treated water in the treated water tank 6 is prepared, the water is passed through the ultraviolet irradiation device 7, and the endotoxin concentration and the number of viable bacteria before and after the ultraviolet irradiation device 7 are prepared. Was examined for changes.
  • the endotoxin concentration was measured using a Toxinometer (registered trademark) ET-mini manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.
  • the viable cell count was measured by a membrane filter method. More specifically, after quantitatively collecting the treated water to be inspected with a sterilized syringe and performing filtration with a filter unit called a 37 mm monitor, a culture medium is injected into the 37 mm monitor, and the resulting mixture is placed in a constant temperature incubator. The cells were placed and cultured at a predetermined temperature for a predetermined time.
  • CFU Colony Forming Unit
  • the measurement results are shown in FIG.
  • the number of viable bacteria (indicated by the solid line in the figure) is substantially zero (CFU / ml) by performing the ultraviolet irradiation by the ultraviolet irradiation device 7, but the endotoxin concentration (indicated by the broken line in the drawing) is determined by the ultraviolet irradiation device.
  • the values before and after 7 are substantially the same. This is because, by irradiating the ultraviolet irradiation device 7 with ultraviolet light that does not include light having a wavelength of less than 255 nm, bacteria are inactivated and bacterial growth is suppressed, and bacterial cells are not destroyed. Therefore, it is considered that the endotoxin concentration did not increase.
  • the EU of endotoxin concentration unit EU / ml represents an endotoxin activity unit (Endotoxin @ Unit).
  • the ultraviolet light irradiated by the ultraviolet irradiation device 7 is a light whose center wavelength is from 255 nm to 350 nm and less than 255 nm. Not included. This makes it possible to inactivate the bacterial cells contained in the treated water without destroying them, and to suppress the generation of endotoxin (an increase in endotoxin concentration) as a pyrogen in the treated water. .
  • the water treatment system 1 according to the present embodiment can inactivate bacteria in treated water and can keep the endotoxin concentration low, and is particularly suitable for medical uses such as blood purification treatment.
  • the water treatment system 1 having the treated water tank 6 has been described. However, when the supply amount of treated water is small, the treated water tank 6 can be omitted.
  • an ultraviolet irradiation device 7 may be provided between the reverse osmosis filtration device 5 and the treated water outlet 1b. That is, the ultraviolet irradiation device 7 is provided in front of the treated water outlet 1b that supplies treated water to a treated water using device such as a blood purification device, and supplies the treated water irradiated with ultraviolet rays by the ultraviolet irradiation device 7 from the treated water outlet 1b. You may comprise so that it may supply.
  • the treated water is output only after passing through the ultraviolet irradiation device 7 once, the irradiation amount of the ultraviolet light in the ultraviolet irradiation device 7 is changed as shown in FIG. It is desirable to increase the size as compared with the case where the number is provided.
  • the circulation flow path 8 and the circulation pump 9 may be omitted, and the ultraviolet irradiation device 7 may be provided between the treated water tank 6 and the treated water outlet 1b.
  • an ultraviolet irradiation device 7 may be provided in the treated water tank 6.
  • a plurality of light emitting diodes as the light source 73 may be provided on the upper lid 61 of the treated water tank 6 so as to irradiate ultraviolet rays downward in the vertical direction.
  • the ultraviolet irradiation device 7 is provided on the downstream side (the treated water outlet 1b side) of the reverse osmosis filtration device 5 .
  • a second ultraviolet irradiation device 10 for irradiating the water flowing from the raw water intake 1a to the reverse osmosis filtration device with ultraviolet light.
  • the second ultraviolet irradiation device 10 a device having the same configuration as that of the ultraviolet irradiation device 7 can be used.
  • the second ultraviolet irradiation device 10 is provided immediately after the raw water tank 2, that is, between the raw water tank 2 and the activated carbon device 3. Thereby, it can suppress that bacteria adhere to the activated carbon device 3, the soft water device 4, and the reverse osmosis filtration device 5, and it is possible to suppress the contamination of each device with bacteria.
  • the endotoxin can be removed by the reverse osmosis filtration device 5, so that an ultraviolet germicidal lamp can be used as a light source of the second ultraviolet irradiation device 10.
  • ultraviolet germicidal lamps are relatively difficult to provide in the flow channel due to their large size, and because they contain mercury, light emitting diodes are used as light sources from the viewpoint of simplifying the device configuration and ensuring safety. Is more desirable.
  • the second ultraviolet irradiation device 10 is provided between the raw water tank 2 and the activated carbon device 3.
  • the present invention is not limited to this, and the second ultraviolet irradiation device 10 may be provided between the activated carbon device 3 and the water softening device 4, or the reverse of the soft water device 4.
  • a second ultraviolet irradiation device 10 may be provided between the device and the permeation filtration device 5.
  • an ultraviolet irradiation device may be further provided at a place where a bacteria collecting filter for collecting bacteria is used, as an alternative to the bacteria compensating filter.
  • the water treatment system 12 shown in FIG. 6 is different from the water treatment system 11 of FIG. 5 in that the water treatment system 12 further includes an irradiation amount control unit 21 that can control the irradiation amount of ultraviolet light in the ultraviolet irradiation device 7 and the second ultraviolet irradiation device 10. It is.
  • the irradiation amount control unit 21 is mounted on the control device 22, and is realized by appropriately combining an arithmetic element such as a CPU, a storage device such as a memory, software, an interface, and the like.
  • the water treatment system 12 further includes a recovered water flow path 23 for returning the recovered water discharged without passing through the reverse osmosis membrane in the reverse osmosis filtration device 5 to the raw water tank 2.
  • the irradiation amount control unit 21 is configured to control the irradiation amount (irradiation intensity) of the ultraviolet rays by controlling the drive current supplied to the light emitting diode as the light source 73.
  • the irradiation amount control unit 21 for example, it is possible to increase the irradiation amount of ultraviolet light only when it is assumed that a large amount of bacteria is contained, and to control the irradiation amount of ultraviolet light otherwise, thereby suppressing power consumption. It is possible to save energy and extend the life of the light emitting diode used as the light source 73 to improve maintainability.
  • the irradiation amount control unit 21 controls the period from when the supply of the treated water from the reverse osmosis filtration device 5 to the treated water tank 6 is started until a predetermined time elapses after the supply of the treated water is completed. In addition, control is performed so that the irradiation amount of ultraviolet rays in the ultraviolet irradiation device 7 is increased from the irradiation amount in a normal state.
  • the irradiation amount of ultraviolet rays in a normal state it is possible to set the irradiation amount of ultraviolet rays in a normal state to about 70% of the maximum irradiation amount, and to set the irradiation amount of ultraviolet rays in supplying the treated water to about 80% of the maximum irradiation amount.
  • This makes it possible to sufficiently inactivate the bacteria in the treated water even when the irradiation amount of the ultraviolet ray in the normal state is reduced, and to reduce the irradiation amount while sufficiently inactivating the bacteria contained in the treated water. It is possible to reduce energy consumption and extend the life of the light source 73.
  • the recovered water discharged without passing through the reverse osmosis membrane in the reverse osmosis filtration device 5 does not contain chlorine because it has passed through the activated carbon device or the soft water device 4, and the water that has passed through the reverse osmosis membrane is It is removed and concentrated, and has a high bacterial count. Therefore, when the flow rate of the recovered water increases and the proportion of the recovered water in the raw water tank 2 increases, the chlorine concentration in the raw water tank 2 decreases, and bacteria easily propagate in the raw water tank 2. Therefore, in the water treatment system 12, the irradiation amount control unit 21 is configured to increase or decrease the irradiation amount of the ultraviolet light in the second ultraviolet irradiation device 10 according to the increase or decrease of the recovered water returned to the raw water tank 2.
  • the flow rate of the recovered water and the flow rate of the raw water are detected, and the ratio of the recovered water and the raw water in the raw water tank 2 (the amount of the recovered water / the amount of the raw water) is calculated. If the ratio is larger than the threshold value, the irradiation amount of the ultraviolet ray in the second ultraviolet irradiation device 10 is set to be strong (for example, about 90% of the maximum irradiation amount).
  • the irradiation amount control unit 21 is configured to make the irradiation amount of the ultraviolet light weak (for example, about 50% of the maximum irradiation amount).
  • the irradiation amount was controlled in two stages of strong and weak.
  • the irradiation amount may be controlled in three or more stages, or depending on the amount of recovered water (or the ratio of recovered water and raw water in the raw water tank 2). May be controlled steplessly.
  • the flow rate of the recovered water can be determined, for example, from the difference between the amount of water supplied to the reverse osmosis filtration device 5 and the amount of treated water output from the reverse osmosis filtration device 5.
  • the ultraviolet irradiation device 7 even when the ultraviolet irradiation device 7 is provided in a stage preceding the treated water outlet 1 b, it is possible to control the irradiation amount of the ultraviolet light in the ultraviolet irradiation device 7.
  • the irradiation amount control is performed such that the irradiation amount of the ultraviolet light in the ultraviolet irradiation device 7 is increased or decreased according to the increase or decrease of the treated water (the treated water output from the treated water outlet 1b) supplied to the treated water using device such as a blood purification device.
  • the unit 21 it is possible to save energy and extend the life of the light source 73 by reducing the irradiation amount while sufficiently inactivating bacteria contained in the treated water.
  • the irradiation amount control unit 21 may be configured to be able to control the irradiation amount of the ultraviolet light in the ultraviolet irradiation device 7 and the second ultraviolet irradiation device 10 based on a control signal from an external device. For example, in blood purification treatment, required cleanliness of treated water differs depending on the treatment content. Therefore, for example, a control signal indicating the treatment content to be performed is received from the dialysis fluid supply device, and the ultraviolet rays in the ultraviolet irradiation device 7 and the second ultraviolet irradiation device 10 are changed according to the information of the treatment content included in the received control signal.
  • the dose controller 21 may be configured to control the dose.
  • the irradiation amount control unit 21 may be configured to increase the irradiation amount of ultraviolet light in the ultraviolet irradiation device 7 as compared with normal time.
  • Irradiation of ultraviolet rays in the ultraviolet irradiation device 7 and the second ultraviolet irradiation device 10 according to an input from an input unit (not shown) such as an operation panel provided in the water treatment system 12 without depending on a control signal from an external device.
  • the amount may be manually controllable. For example, when it is determined by inspection that the number of bacteria contained in the treated water is large, it is possible to forcibly increase the irradiation amount of ultraviolet rays.
  • the ultraviolet irradiation by the ultraviolet irradiation device 7 and the second ultraviolet irradiating device 10 becomes unnecessary.
  • the irradiation amount control unit 21 may be configured so that the irradiation of ultraviolet rays is not performed in the seventh and second ultraviolet irradiation devices 10.
  • the cleaning / disinfecting process is a process of cleaning and disinfecting the internal piping using hot water or a chemical for cleaning / disinfecting.
  • the amount of ultraviolet irradiation by the ultraviolet irradiating device 7 may be made smaller than usual, because the contamination by bacteria is small. More specifically, the irradiation amount control unit 21 performs control to reduce the irradiation amount of ultraviolet light in the ultraviolet irradiation device 7 from the normal irradiation amount until a predetermined time elapses after the end of the cleaning / disinfecting processing. It may be configured as follows.
  • the irradiation amount control unit 21 may be configured to create a database including the irradiation amount and irradiation time of ultraviolet rays in the ultraviolet irradiation device 7 and store the database in the storage unit 24.
  • the database may include information such as the flow rate of the supplied raw water and the flow rate of the treated water output from the treated water outlet 1b. Further, the database stored in the storage unit 24 may be readable by an external device such as a management device. This makes it possible to obtain the correlation of the cleanliness with respect to the irradiation amount of ultraviolet rays and the like, together with the results of the actual inspection of the cleanliness (results of the measurement of the number of bacteria, etc.), and fine-tune the irradiation amount of ultraviolet rays. Thus, more efficient operation becomes possible.
  • a reverse osmosis filtration device (5) for generating treated water by a reverse osmosis membrane, and an ultraviolet irradiation device (7) for irradiating treated water from the reverse osmosis filtration device (5) with ultraviolet light The water treatment system (1), wherein the ultraviolet light irradiated by the ultraviolet irradiation device (7) has a center wavelength of 255 nm or more and 350 nm or less and does not include light having a wavelength of less than 255 nm.
  • the ultraviolet irradiation device (7) has a flow path (71) through which the treated water flows, and irradiates the treated water flowing through the flow path (71) with ultraviolet light, [1] or [2].
  • Water treatment system (1) according to 1.
  • Water treatment system (1) according to [3].
  • the ultraviolet light irradiated by the ultraviolet irradiation device (7) has a center wavelength of not less than 255 nm and not more than 350 nm and does not include light having a wavelength of less than 255 nm, and the amount of ultraviolet irradiation in the ultraviolet irradiation device (7).
  • the irradiation amount control unit (21) is configured to start the supply of the treated water from the reverse osmosis filtration device (5) to the treated water tank (6), and then lapse a predetermined time after the supply of the treated water is completed.
  • the ultraviolet irradiation device (7) is provided in front of a treated water outlet (1b) for supplying treated water to a treated water using device, and treats the treated water irradiated with ultraviolet light by the ultraviolet irradiation device (7) to the treated water.
  • the irradiation amount control unit (21) is configured to supply the treated water from the treated water outlet (1b).
  • An ultraviolet irradiation device (10) is further provided, and the irradiation amount control section (21) is configured to be capable of controlling the irradiation amount of ultraviolet light in the second ultraviolet irradiation device (10).
  • the water treatment system (12) according to any one of the above.
  • the water treatment system (12) according to [9], wherein the water treatment system is configured to:
  • the irradiation amount control section (21) is configured to be capable of controlling the irradiation amount of the ultraviolet light in the ultraviolet irradiation device (7) based on a control signal from an external device, [6] to [10].
  • Water treatment system (12) according to any one of the preceding claims.
  • the irradiation amount control unit (21) is configured not to irradiate the ultraviolet irradiation device (7) with ultraviolet light during the cleaning and disinfecting process for cleaning and disinfecting the internal piping, [6].
  • a water treatment system (12) according to any one of claims 1 to 11.
  • the irradiation amount control unit (21) reduces the irradiation amount of the ultraviolet light in the ultraviolet irradiation device (7) from the normal irradiation amount until a predetermined time elapses after the completion of the cleaning / disinfecting process.
  • the water treatment system (12) according to [12], wherein the water treatment system performs control to cause the water treatment to be performed.
  • the irradiation amount control unit (21) is configured to create a database including the amount of irradiation of ultraviolet light and the irradiation time in the ultraviolet irradiation device (7), and store the database in the storage unit (24).
  • the water treatment system (12) according to any one of [6] to [13].
  • the present invention can be appropriately modified and implemented without departing from the spirit thereof.
  • the case where the treated water generated by the water treatment systems 1, 11, and 12 is used for blood purification treatment but the use of the treated water generated by the water treatment systems 1, 11, and 12 is
  • the present invention is not limited thereto, and may be used, for example, as water for surgery, water for cleaning semiconductors, and water for manufacturing chemicals.

Abstract

A water treatment system according to the present invention is provided with: a reverse osmosis filtration device 5 which produces a treated water by means of a reverse osmosis membrane; and an ultraviolet light irradiation device 7 which irradiates the treated water from the reverse osmosis filtration device 5 with ultraviolet light. The ultraviolet light irradiated from the ultraviolet light irradiation device 7 has a center wavelength of from 255 nm to 350 nm (inclusive), and does not contain light having a wavelength of less than 255 nm.

Description

水処理システムWater treatment system
　本発明は、例えば医療用途に用いられる水処理システムに関する。 The present invention relates to a water treatment system used for, for example, medical applications.
　従来、逆浸透膜（ＲＯ膜）により処理水を生成する逆浸透ろ過装置を備えた水処理システムが知られている。特許文献１では、処理水を貯留する処理水タンクに紫外線殺菌灯（紫外線ランプ）を設け、当該紫外線殺菌灯により処理水に紫外線を照射することで、処理水タンク内の処理水を殺菌している。 Conventionally, a water treatment system provided with a reverse osmosis filtration device that generates treated water by a reverse osmosis membrane (RO membrane) is known. In Patent Literature 1, an ultraviolet sterilizing lamp (ultraviolet lamp) is provided in a treated water tank for storing the treated water, and the treated water in the treated water tank is sterilized by irradiating the treated water with ultraviolet rays by the ultraviolet sterilizing lamp. I have.
特開２００５－２８２１５号公報JP 2005-28215 A
　しかしながら、紫外線殺菌灯は一般に非常に短い波長（例えば２５５ｎｍ未満の波長）の光を含んでいるため、紫外線殺菌灯で処理水の殺菌を行うと、処理水中の細菌の細胞が破壊されてしまい、エンドトキシンと呼称される耐熱性の菌体内毒素が発生してしまうという課題がある。例えば、処理水を透析等の医療用途に用いる場合には、エンドトキシンが発熱等の原因となることから、対策が望まれる。 However, since an ultraviolet germicidal lamp generally contains light having a very short wavelength (for example, a wavelength of less than 255 nm), sterilizing treated water with an ultraviolet germicidal lamp destroys bacterial cells in the treated water, There is a problem that heat-resistant endotoxin called endotoxin is generated. For example, when the treated water is used for medical use such as dialysis, a countermeasure is desired since endotoxin causes heat and the like.
　そこで、本発明は、エンドトキシンの発生を抑制可能な水処理システムを提供することを目的とする。 Therefore, an object of the present invention is to provide a water treatment system capable of suppressing the generation of endotoxin.
　本発明は、上記課題を解決することを目的として、逆浸透膜により処理水を生成する逆浸透ろ過装置と、前記逆浸透ろ過装置からの処理水に紫外光を照射する紫外線照射装置と、を備え、前記紫外線照射装置が照射する紫外光は、その中心波長が波長２５５ｎｍ以上３５０ｎｍ以下であって、かつ、波長２５５ｎｍ未満の光を含まない、水処理システムを提供する。 The present invention, for the purpose of solving the above problems, a reverse osmosis filtration device that generates treated water by a reverse osmosis membrane, and an ultraviolet irradiation device that irradiates the treated water from the reverse osmosis filtration device with ultraviolet light, Provided is a water treatment system, wherein the ultraviolet light irradiated by the ultraviolet irradiation device has a center wavelength of 255 nm or more and 350 nm or less and does not include light having a wavelength of less than 255 nm.
　本発明によれば、エンドトキシンの発生を抑制可能な水処理システムを提供できる。 According to the present invention, a water treatment system capable of suppressing the generation of endotoxin can be provided.
本発明の一実施の形態に係る水処理システムを示す概略構成図である。It is a schematic structure figure showing the water treatment system concerning one embodiment of the present invention. 紫外線照射装置の断面図である。It is sectional drawing of an ultraviolet irradiation device. 図１Ｂの紫外線照射装置で使用する発光ダイオードのスペクトル分布を示すグラフである。2 is a graph showing a spectrum distribution of a light emitting diode used in the ultraviolet irradiation device of FIG. 1B. 紫外線照射装置の前後でのエンドトキシン濃度及び生菌数の変化を示すグラフである。It is a graph which shows the change of the endotoxin density | concentration and viable cell count before and behind an ultraviolet irradiation apparatus. 紫外線照射装置の配置位置の変形例を説明する図である。It is a figure explaining the modification of the arrangement position of an ultraviolet irradiation device. 紫外線照射装置の配置位置の変形例を説明する図である。It is a figure explaining the modification of the arrangement position of an ultraviolet irradiation device. 本発明の一変形例に係る水処理システムの概略構成図である。It is a schematic structure figure of a water treatment system concerning a modification of the present invention. 本発明の他の実施の形態に係る水処理システムの概略構成図である。It is a schematic structure figure of a water treatment system concerning other embodiments of the present invention.
［実施の形態］
　以下、本発明の実施の形態を添付図面にしたがって説明する。 [Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
　図１Ａは、本実施の形態に係る水処理システムを示す概略構成図であり、図１Ｂは紫外線照射装置の断面図である。 FIG. 1A is a schematic configuration diagram showing a water treatment system according to the present embodiment, and FIG. 1B is a sectional view of an ultraviolet irradiation device.
　図１Ａに示すように、水処理システム１は、原水取入口１ａから導入された原水を貯留する原水タンク２と、原水から残留塩素等を除去する活性炭装置３と、活性炭装置３を通過した水を軟水とする軟水装置４と、軟水装置４を通過した水が供給され、逆浸透膜（ＲＯ膜）により処理水を生成する逆浸透ろ過装置（ＲＯ装置）５と、逆浸透ろ過装置５からの処理水を貯留する処理水タンク６と、を備えている。水処理システム１で生成された処理水は、例えば、血液浄化治療等の医療用途に用いられる。 As shown in FIG. 1A, a water treatment system 1 includes a raw water tank 2 for storing raw water introduced from a raw water intake 1a, an activated carbon device 3 for removing residual chlorine and the like from the raw water, and a water passing through the activated carbon device 3. A water softening device 4 for softening the water, a reverse osmosis filtration device (RO device) 5 supplied with water passing through the water softening device 4 and generating treated water by a reverse osmosis membrane (RO membrane), and a reverse osmosis filtration device 5 And a treated water tank 6 for storing the treated water. The treated water generated by the water treatment system 1 is used for medical applications such as blood purification treatment.
　原水タンク２は、原水が不足することのないように、原水を一時的に貯留する貯水槽である。活性炭装置３は、逆浸透ろ過装置５の前処理として、原水中の残留塩素（遊離塩素）等を活性炭に吸着し除去するものである。軟水装置４は、ナトリウム型の陽イオン交換樹脂を有しており、活性炭装置３を通過した原水中の硬度成分（カルシウムイオン及びマグネシウムイオン）を、陽イオン交換樹脂中のナトリウムイオンとのイオン交換により除去し、軟水化するものである。 The raw water tank 2 is a water tank for temporarily storing raw water so that the raw water does not run short. The activated carbon device 3 adsorbs and removes residual chlorine (free chlorine) and the like in raw water as a pretreatment of the reverse osmosis filtration device 5 to the activated carbon. The water softener 4 has a sodium-type cation exchange resin, and ion exchanges hardness components (calcium ions and magnesium ions) in raw water that have passed through the activated carbon device 3 with sodium ions in the cation exchange resin. To soften the water.
　逆浸透ろ過装置５は、逆浸透膜を内蔵したモジュール（不図示）と加圧ポンプ(不図示)とを有しており、逆浸透膜でろ過を行うことにより処理水を生成する。処理水タンク６は、処理水の使用量が増加した際に処理水が不足することのないように、処理水を一時的に貯留する貯水槽である。逆浸透ろ過装置５からの処理水は、処理水タンク６に一時貯留された後、処理水出口１ｂから血液浄化装置等の処理水を使用する装置に供給される。 The reverse osmosis filtration device 5 has a module (not shown) having a built-in reverse osmosis membrane and a pressure pump (not shown), and generates treated water by performing filtration with the reverse osmosis membrane. The treated water tank 6 is a water storage tank for temporarily storing the treated water so that the treated water does not run short when the used amount of the treated water increases. The treated water from the reverse osmosis filtration device 5 is temporarily stored in a treated water tank 6, and then supplied from a treated water outlet 1b to a device using treated water such as a blood purification device.
　本実施の形態に係る水処理システム１では、逆浸透ろ過装置５からの処理水に紫外光を照射する紫外線照射装置７をさらに備えている。本実施の形態では、処理水タンク６に出入口が接続された循環流路８と、処理水タンク６内の処理水を循環流路８に流通させる循環ポンプ９と、を備えており、紫外線照射装置７は、循環流路８に設けられている。 水 The water treatment system 1 according to the present embodiment further includes an ultraviolet irradiation device 7 for irradiating the treated water from the reverse osmosis filtration device 5 with ultraviolet light. In the present embodiment, a circulation channel 8 having an inlet / outlet connected to the treated water tank 6 and a circulation pump 9 for causing the treated water in the treated water tank 6 to flow through the circulation channel 8 are provided. The device 7 is provided in the circulation channel 8.
　図１Ｂに示すように、紫外線照射装置７は、処理水を流通する流路７１を有し、当該流路７１を流れる処理水に紫外線を照射するように構成されている。以下、紫外線照射装置７よりも上流側の循環流路８を上流側循環流路８ａと呼称し、紫外線照射装置７よりも下流側の循環流路８を下流側循環流路８ｂと呼称する。 1) As shown in FIG. 1B, the ultraviolet irradiation device 7 has a flow path 71 through which the treated water flows, and is configured to irradiate the treated water flowing through the flow path 71 with ultraviolet light. Hereinafter, the circulation channel 8 upstream of the ultraviolet irradiation device 7 is referred to as an upstream circulation channel 8a, and the circulation channel 8 downstream of the ultraviolet irradiation device 7 is referred to as a downstream circulation channel 8b.
　より具体的には、紫外線照射装置７は、上流側循環流路８ａと下流側循環流路８ｂを連通し直線状に延びる直管７２と、直管７２の内部空間である流路７１を流れる処理水に紫外光を照射する光源７３と、を有している。直管７２の両端部は、それぞれ第１筐体７４及び第２筐体７５に挿入されている。直管７２と上流側循環流路８ａとは、第１筐体７４を介して連通されており、直管７２と下流側循環流路８ｂとは、第２筐体７５を介して連通されている。 More specifically, the ultraviolet irradiation device 7 flows through a straight pipe 72 that communicates the upstream circulation flow path 8a and the downstream circulation flow path 8b and extends linearly, and a flow path 71 that is an internal space of the straight pipe 72. A light source 73 for irradiating the treated water with ultraviolet light. Both ends of the straight pipe 72 are inserted into the first housing 74 and the second housing 75, respectively. The straight pipe 72 and the upstream circulation flow path 8a communicate with each other via a first housing 74, and the straight pipe 72 and the downstream circulation flow path 8b communicate with each other via a second housing 75. I have.
　第２筐体７５では、その内部空間を直管７２の軸方向に区画するように窓部材７６が設けられており、窓部材７６により区画された空間７６ａに、窓部材７６を介して直管７２の下流側の端部と対向するように、光源７３が設けられている。直管７２としては、少なくともその内周面が、光源７３からの紫外光を反射する材質からなるもの（例えばポリテトラフルオロエチレン等）を用いるとよい。窓部材７６としては、紫外光の透過率が高いもの、例えば、石英ガラス（ＳｉＯ２）、サファイアガラス（Ａｌ２Ｏ３）、あるいは非晶質のフッ素系樹脂からなるものを用いることができる。 In the second housing 75, a window member 76 is provided so as to divide the internal space in the axial direction of the straight pipe 72, and the space 76a defined by the window member 76 has a straight pipe through the window member 76. A light source 73 is provided so as to face the downstream end of the light source 72. As the straight tube 72, at least the inner peripheral surface thereof is preferably made of a material that reflects ultraviolet light from the light source 73 (for example, polytetrafluoroethylene or the like). As the window member 76, a member having a high transmittance of ultraviolet light, for example, a member made of quartz glass (SiO 2 ), sapphire glass (Al 2 O 3 ), or an amorphous fluorine-based resin can be used.
　第１筐体７４内には、直管７２の上流側の端部と対向するように、紫外光を反射する板状の反射体７７が設けられている。反射体７７は、直管７２の上流側に、光源７３と対向するように設けられている。反射体７７は、光源７３から出射され直管７２の内部を伝播する紫外光を下流側へと反射することで、紫外光の照射効率を高める。反射体７７としては、例えば、鏡面研磨されたアルミニウム、あるいは、基材となるアルミニウム上にアルミニウムを蒸着し、さらに酸化膜層を蒸着したものを用いることができる。なお、図１Ｂに示す紫外線照射装置７の具体的な構成は、あくまで一例であり、紫外線照射装置７の構成は適宜変更可能である。 板 A plate-like reflector 77 that reflects ultraviolet light is provided in the first housing 74 so as to face the upstream end of the straight pipe 72. The reflector 77 is provided on the upstream side of the straight pipe 72 so as to face the light source 73. The reflector 77 reflects the ultraviolet light emitted from the light source 73 and propagating inside the straight tube 72 to the downstream side, thereby increasing the irradiation efficiency of the ultraviolet light. As the reflector 77, for example, mirror-polished aluminum, or a material obtained by depositing aluminum on aluminum serving as a base material and further depositing an oxide film layer can be used. The specific configuration of the ultraviolet irradiation device 7 shown in FIG. 1B is merely an example, and the configuration of the ultraviolet irradiation device 7 can be appropriately changed.
　本実施の形態に係る水処理システム１では、紫外線照射装置７が照射する紫外光は、その中心波長が波長２５５ｎｍ以上３５０ｎｍ以下であって、かつ、波長２５５ｎｍ未満の光を含まない。より具体的には、本実施の形態では、光源７３として、その中心波長が波長２５５ｎｍ以上３５０ｎｍ以下の紫外光を発光し、かつ、波長２５５ｎｍ未満の光を含まない発光ダイオード（ＬＥＤ）を用いる。 で は In the water treatment system 1 according to the present embodiment, the ultraviolet light emitted by the ultraviolet irradiation device 7 has a center wavelength of not less than 255 nm and not more than 350 nm, and does not include light having a wavelength of less than 255 nm. More specifically, in the present embodiment, a light emitting diode (LED) that emits ultraviolet light having a center wavelength of 255 nm or more and 350 nm or less and does not include light having a wavelength of less than 255 nm is used as the light source 73.
　本実施の形態において、紫外線照射装置７の光源７３として用いた発光ダイオードのスペクトル分布を図２に示す。光源７３として用いた発光ダイオードは、ピーク波長（中心波長）が２５℃環境下において２８５ｎｍであり、照射する光に波長２５５ｎｍ未満の光を含んでいない。 ス ペ ク ト ル FIG. 2 shows the spectrum distribution of the light emitting diode used as the light source 73 of the ultraviolet irradiation device 7 in this embodiment. The light-emitting diode used as the light source 73 has a peak wavelength (center wavelength) of 285 nm in a 25 ° C. environment, and does not include light having a wavelength of less than 255 nm in irradiation light.
　逆浸透ろ過装置５では、原水に含まれる細菌の大部分を除去可能であるが、処理水に含まれる細菌の数（生菌数）を完全にゼロにすることは技術的に非常に困難である。よって、特に処理水タンク６に処理水を貯留するように構成されている場合には、処理水タンク６に貯留している間に細菌が増殖してしまわないように対策を行うことが望まれる。しかし、例えば、紫外線殺菌灯（紫外線ランプ）により紫外線の照射を行った場合には、紫外線殺菌灯は波長２５５ｎｍ未満の光を含むため、処理水に含まれる細菌の細胞が破壊されてしまい、エンドトキシンが発生してしまう。なお、エンドトキシンとは、グラム陰性菌の細胞壁外膜に存在するリポ多糖の総称であり、耐熱性の菌体内毒素であって、代表的な発熱物質（パイロジェン）として知られている。 Although the reverse osmosis filtration device 5 can remove most of the bacteria contained in the raw water, it is technically very difficult to completely reduce the number of bacteria (the number of viable bacteria) contained in the treated water to zero. is there. Therefore, when the treated water is stored in the treated water tank 6 in particular, it is desired to take measures to prevent bacteria from growing during storage in the treated water tank 6. . However, for example, when ultraviolet irradiation is performed by an ultraviolet germicidal lamp (ultraviolet lamp), since the ultraviolet germicidal lamp contains light having a wavelength of less than 255 nm, bacterial cells contained in the treated water are destroyed, and endotoxin is destroyed. Will occur. Endotoxin is a general term for lipopolysaccharide present in the outer membrane of the cell wall of Gram-negative bacteria, is a heat-resistant endotoxin, and is known as a typical pyrogen.
　よって、水処理システム１を血液浄化治療等の医療用途に用いる場合には、処理水からエンドトキシンを除去するためのフィルタを別途設ける必要が生じ、コスト上昇の原因になる。また、紫外線殺菌灯は水銀を含んでいるため、何らかの原因で紫外線殺菌灯が破損すると、処理水に水銀が混入してしまうこととなり、安全性の観点から、特に医療用途に用いる際には好ましくないといえる。 Therefore, when the water treatment system 1 is used for medical applications such as blood purification treatment, it is necessary to separately provide a filter for removing endotoxin from the treated water, which causes an increase in cost. In addition, since the UV germicidal lamp contains mercury, if the UV germicidal lamp is damaged for any reason, mercury will be mixed into the treated water, and from the viewpoint of safety, it is particularly preferable when used in medical applications. I can't say that.
　本実施の形態に係る水処理システム１では、照射する光に波長２５５ｎｍ未満の光を含まない発光ダイオードを光源７３に用いているため、処理水に含まれる細菌の細胞が破壊されてしまうことが抑制される。また、波長２５５ｎｍ未満の光を含まない紫外光を照射することによって、細菌の増殖能力が抑制された状態、すなわち細菌が不活化された状態になると考えられる。つまり、照射する光に波長２５５ｎｍ未満の光を含まない紫外光を発光する発光ダイオードを光源７３に用いることで、細菌の増殖が抑制されると共に、エンドトキシンの濃度が上昇してしまうことを抑制可能になる。さらに、発光ダイオードは紫外線殺菌灯のように水銀を含まないため、安全性も高い。 In the water treatment system 1 according to the present embodiment, the light-emitting diode that does not include light having a wavelength of less than 255 nm is used as the light source 73 in the water to be irradiated, so that bacterial cells contained in the treated water may be destroyed. Is suppressed. Irradiation with ultraviolet light not containing light having a wavelength of less than 255 nm is considered to result in a state in which the growth ability of bacteria is suppressed, that is, a state in which bacteria are inactivated. In other words, by using a light emitting diode that emits ultraviolet light that does not include light having a wavelength of less than 255 nm as the light source 73, the growth of bacteria can be suppressed and the increase in the concentration of endotoxin can be suppressed. become. Furthermore, since the light emitting diode does not contain mercury unlike an ultraviolet germicidal lamp, the safety is high.
　なお、紫外線照射装置７で紫外線を照射する強さ（光量等）が強すぎると、細菌の細胞が破壊されてしまう場合があるため、光源７３の発光強度や、流路７１を流れる処理水の流量等を、細菌を不活化することができ、かつ、細菌の細胞が破壊されない程度（エンドトキシンの濃度が上昇しない程度）となるように適宜調整するとよい。 In addition, if the intensity (the amount of light, etc.) of irradiating the ultraviolet rays with the ultraviolet irradiation device 7 is too strong, bacterial cells may be destroyed. The flow rate or the like may be appropriately adjusted so that the bacteria can be inactivated and the bacterial cells are not destroyed (the endotoxin concentration does not increase).
　本実施の形態の効果を確かめるため、処理水タンク６内の処理水を模擬した水を用意し、当該水を紫外線照射装置７に通して、紫外線照射装置７の前後におけるエンドトキシン濃度及び生菌数の変化を調べた。 In order to confirm the effect of the present embodiment, water simulating the treated water in the treated water tank 6 is prepared, the water is passed through the ultraviolet irradiation device 7, and the endotoxin concentration and the number of viable bacteria before and after the ultraviolet irradiation device 7 are prepared. Was examined for changes.
　エンドトキシン濃度の測定は、富士フイルム和光純薬株式会社製トキシノメータ（登録商標）ＥＴ－ｍｉｎｉを用いて行った。また、生菌数については、メンブランフィルター法により測定した。より具体的には、検査対象となる処理水を滅菌したシリンジで定量採取し、３７ｍｍモニタと呼称されるフィルタユニットでろ過を行った後、当該３７ｍｍモニタ内に培地を注入し、恒温培養器に入れて所定温度で所定時間培養した。培養した後、３７ｍｍフィルタ上で成長したコロニーを計数し、計数したコロニー数（ＣＦＵ、Colony Forming Unit）を採取した処理水の検体液量（ｍｌ）で除することにより、生菌数（ＣＦＵ／ｍｌ）を求めた。 The endotoxin concentration was measured using a Toxinometer (registered trademark) ET-mini manufactured by Fujifilm Wako Pure Chemical Industries, Ltd. The viable cell count was measured by a membrane filter method. More specifically, after quantitatively collecting the treated water to be inspected with a sterilized syringe and performing filtration with a filter unit called a 37 mm monitor, a culture medium is injected into the 37 mm monitor, and the resulting mixture is placed in a constant temperature incubator. The cells were placed and cultured at a predetermined temperature for a predetermined time. After culturing, the number of colonies that grew on a 37 mm filter was counted, and the number of colonies counted (CFU, Colony Forming Unit) was divided by the amount (ml) of the sampled treated water to obtain the viable cell count (CFU / ml).
　測定結果を図３に示す。紫外線照射装置７により紫外線照射を行うことで、生菌数（図中実線で示す）は略ゼロ（ＣＦＵ／ｍｌ）となっているが、エンドトキシン濃度（図中破線で示す）は、紫外線照射装置７の前後で略同じ値となっている。これは、紫外線照射装置７で波長２５５ｎｍ未満の光を含まない紫外線を照射することにより、細菌の不活化が行われて細菌の増殖が抑制されており、かつ、細菌の細胞が破壊されていないためにエンドトキシン濃度が増加していないと考えられる。なお、エンドトキシン濃度の単位ＥＵ／ｍｌのＥＵは、エンドトキシン活性単位（Endotoxin Unit）を表している。 The measurement results are shown in FIG. The number of viable bacteria (indicated by the solid line in the figure) is substantially zero (CFU / ml) by performing the ultraviolet irradiation by the ultraviolet irradiation device 7, but the endotoxin concentration (indicated by the broken line in the drawing) is determined by the ultraviolet irradiation device. The values before and after 7 are substantially the same. This is because, by irradiating the ultraviolet irradiation device 7 with ultraviolet light that does not include light having a wavelength of less than 255 nm, bacteria are inactivated and bacterial growth is suppressed, and bacterial cells are not destroyed. Therefore, it is considered that the endotoxin concentration did not increase. The EU of endotoxin concentration unit EU / ml represents an endotoxin activity unit (Endotoxin @ Unit).
（実施の形態の作用及び効果）
　以上説明したように、本実施の形態に係る水処理システム１では、紫外線照射装置７が照射する紫外光は、その中心波長が波長２５５ｎｍ以上３５０ｎｍ以下であって、かつ、波長２５５ｎｍ未満の光を含まない。これにより、処理水に含まれる細菌の細胞を破壊せずに不活化することが可能となり、処理水において発熱物質であるエンドトキシンの発生（エンドトキシン濃度が高くなること）を抑制することが可能になる。本実施の形態に係る水処理システム１は、処理水の細菌を不活化でき、かつ、エンドトキシン濃度を低く抑えることが可能であり、血液浄化治療等の医療用途に特に好適である。 (Operation and Effect of Embodiment)
As described above, in the water treatment system 1 according to the present embodiment, the ultraviolet light irradiated by the ultraviolet irradiation device 7 is a light whose center wavelength is from 255 nm to 350 nm and less than 255 nm. Not included. This makes it possible to inactivate the bacterial cells contained in the treated water without destroying them, and to suppress the generation of endotoxin (an increase in endotoxin concentration) as a pyrogen in the treated water. . The water treatment system 1 according to the present embodiment can inactivate bacteria in treated water and can keep the endotoxin concentration low, and is particularly suitable for medical uses such as blood purification treatment.
（変形例）
　上記実施の形態では、処理水タンク６を有する水処理システム１について説明したが、処理水の供給量が少ない場合には、処理水タンク６は省略可能である。この場合、例えば図４Ａに示すように、逆浸透ろ過装置５と処理水出口１ｂとの間に、紫外線照射装置７を設ければよい。つまり、紫外線照射装置７は、血液浄化装置等の処理水使用装置に処理水を供給する処理水出口１ｂの前段に設けられ、紫外線照射装置７により紫外線を照射した処理水を処理水出口１ｂより供給するように構成してもよい。この場合、処理水は紫外線照射装置７を一回通過するのみで出力されることになるため、紫外線照射装置７における紫外線の照射量は、図１Ａのように紫外線照射装置７を循環流路８に設ける場合と比較して大きくすることが望ましい。なお、処理水タンク６を有する場合であっても、循環流路８及び循環ポンプ９を省略し、処理水タンク６と処理水出口１ｂとの間に、紫外線照射装置７を設けてもよい。 (Modification)
In the above embodiment, the water treatment system 1 having the treated water tank 6 has been described. However, when the supply amount of treated water is small, the treated water tank 6 can be omitted. In this case, for example, as shown in FIG. 4A, an ultraviolet irradiation device 7 may be provided between the reverse osmosis filtration device 5 and the treated water outlet 1b. That is, the ultraviolet irradiation device 7 is provided in front of the treated water outlet 1b that supplies treated water to a treated water using device such as a blood purification device, and supplies the treated water irradiated with ultraviolet rays by the ultraviolet irradiation device 7 from the treated water outlet 1b. You may comprise so that it may supply. In this case, since the treated water is output only after passing through the ultraviolet irradiation device 7 once, the irradiation amount of the ultraviolet light in the ultraviolet irradiation device 7 is changed as shown in FIG. It is desirable to increase the size as compared with the case where the number is provided. In addition, even if it has the treated water tank 6, the circulation flow path 8 and the circulation pump 9 may be omitted, and the ultraviolet irradiation device 7 may be provided between the treated water tank 6 and the treated water outlet 1b.
　さらに、図４Ｂに示すように、処理水タンク６内に紫外線照射装置７を設けてもよい。この場合、処理水タンク６の上蓋６１に、鉛直方向下方に紫外線を照射するように光源７３としての複数の発光ダイオードを設けてもよい。 Furthermore, as shown in FIG. 4B, an ultraviolet irradiation device 7 may be provided in the treated water tank 6. In this case, a plurality of light emitting diodes as the light source 73 may be provided on the upper lid 61 of the treated water tank 6 so as to irradiate ultraviolet rays downward in the vertical direction.
　また、上記実施の形態では、逆浸透ろ過装置５の下流側（処理水出口１ｂ側）に紫外線照射装置７を設ける場合について説明したが、図５に示す水処理システム１１のように、逆浸透ろ過装置５の上流側、すなわち原水取入口１ａと逆浸透ろ過装置５との間に、原水取入口１ａから逆浸透ろ過装置へと流れる水に紫外光を照射する第２紫外線照射装置１０をさらに備えてもよい。第２紫外線照射装置１０としては、紫外線照射装置７と同じ構成のものを用いることができる。 Further, in the above-described embodiment, the case where the ultraviolet irradiation device 7 is provided on the downstream side (the treated water outlet 1b side) of the reverse osmosis filtration device 5 has been described. However, as in the case of the water treatment system 11 shown in FIG. An upstream side of the filtration device 5, that is, between the raw water intake 1a and the reverse osmosis filtration device 5, a second ultraviolet irradiation device 10 for irradiating the water flowing from the raw water intake 1a to the reverse osmosis filtration device with ultraviolet light. May be provided. As the second ultraviolet irradiation device 10, a device having the same configuration as that of the ultraviolet irradiation device 7 can be used.
　本実施の形態では、原水タンク２の直後、すなわち原水タンク２と活性炭装置３との間に第２紫外線照射装置１０を設けている。これにより、活性炭装置３、軟水装置４、及び逆浸透ろ過装置５に細菌が付着してしまうことを抑制でき、各装置での細菌による汚染を抑制することが可能になる。なお、第２紫外線照射装置１０でエンドトキシンが発生した場合であっても逆浸透ろ過装置５でこれを除去できるため、第２紫外線照射装置１０の光源として紫外線殺菌灯を用いることも可能である。ただし、紫外線殺菌灯はサイズが大きいために流路に設けることが比較的困難であり、また水銀を含むために、装置構成をシンプルとし安全性を確保するという観点から、光源として発光ダイオードを用いることがより望ましいといえる。 In this embodiment, the second ultraviolet irradiation device 10 is provided immediately after the raw water tank 2, that is, between the raw water tank 2 and the activated carbon device 3. Thereby, it can suppress that bacteria adhere to the activated carbon device 3, the soft water device 4, and the reverse osmosis filtration device 5, and it is possible to suppress the contamination of each device with bacteria. In addition, even if endotoxin is generated in the second ultraviolet irradiation device 10, the endotoxin can be removed by the reverse osmosis filtration device 5, so that an ultraviolet germicidal lamp can be used as a light source of the second ultraviolet irradiation device 10. However, ultraviolet germicidal lamps are relatively difficult to provide in the flow channel due to their large size, and because they contain mercury, light emitting diodes are used as light sources from the viewpoint of simplifying the device configuration and ensuring safety. Is more desirable.
　なお、図５では、第２紫外線照射装置１０を原水タンク２と活性炭装置３との間に設けたが、これに限らず、活性炭装置３と軟水装置４との間、あるいは軟水装置４と逆浸透ろ過装置５との間に第２紫外線照射装置１０を設けてもよい。逆浸透ろ過装置５の直前、すなわち軟水装置４と逆浸透ろ過装置５との間に第２紫外線照射装置１０を設けることで、逆浸透ろ過装置５の下流側の配管等が菌により汚染されにくくなる。 In FIG. 5, the second ultraviolet irradiation device 10 is provided between the raw water tank 2 and the activated carbon device 3. However, the present invention is not limited to this, and the second ultraviolet irradiation device 10 may be provided between the activated carbon device 3 and the water softening device 4, or the reverse of the soft water device 4. A second ultraviolet irradiation device 10 may be provided between the device and the permeation filtration device 5. By providing the second ultraviolet irradiation device 10 immediately before the reverse osmosis filtration device 5, that is, between the water softening device 4 and the reverse osmosis filtration device 5, the downstream piping of the reverse osmosis filtration device 5 is hardly contaminated with bacteria. Become.
　また、菌を捕集する捕菌フィルタを用いている箇所に、補菌フィルタの代替として、紫外線照射装置をさらに設けてもよい。 紫外線 Further, an ultraviolet irradiation device may be further provided at a place where a bacteria collecting filter for collecting bacteria is used, as an alternative to the bacteria compensating filter.
（他の実施の形態）
　図６に示す水処理システム１２は、図５の水処理システム１１において、さらに、紫外線照射装置７及び第２紫外線照射装置１０における紫外線の照射量を制御可能な照射量制御部２１を備えたものである。照射量制御部２１は、制御装置２２に搭載されており、ＣＰＵ等の演算素子、メモリ等の記憶装置、ソフトウェア、インターフェイス等を適宜組み合わせて実現される。 (Other embodiments)
The water treatment system 12 shown in FIG. 6 is different from the water treatment system 11 of FIG. 5 in that the water treatment system 12 further includes an irradiation amount control unit 21 that can control the irradiation amount of ultraviolet light in the ultraviolet irradiation device 7 and the second ultraviolet irradiation device 10. It is. The irradiation amount control unit 21 is mounted on the control device 22, and is realized by appropriately combining an arithmetic element such as a CPU, a storage device such as a memory, software, an interface, and the like.
　また、水処理システム１２では、逆浸透ろ過装置５において逆浸透膜を透過せずに排出された回収水を、原水タンク２に戻す回収水流路２３を備えている。 The water treatment system 12 further includes a recovered water flow path 23 for returning the recovered water discharged without passing through the reverse osmosis membrane in the reverse osmosis filtration device 5 to the raw water tank 2.
　照射量制御部２１は、光源７３としての発光ダイオードに供給する駆動電流を制御することで、紫外線の照射量（照射強度）を制御するように構成されている。照射量制御部２１を備えることで、例えば細菌が多く含まれると想定されるときのみ紫外線の照射量を増加させ、それ以外は紫外線の照射量を抑えるといった制御が可能となり、消費電力を抑えて省エネルギー化を図れると共に、光源７３として用いる発光ダイオードの寿命を延ばしてメンテナンス性を高めることが可能になる。 (4) The irradiation amount control unit 21 is configured to control the irradiation amount (irradiation intensity) of the ultraviolet rays by controlling the drive current supplied to the light emitting diode as the light source 73. By providing the irradiation amount control unit 21, for example, it is possible to increase the irradiation amount of ultraviolet light only when it is assumed that a large amount of bacteria is contained, and to control the irradiation amount of ultraviolet light otherwise, thereby suppressing power consumption. It is possible to save energy and extend the life of the light emitting diode used as the light source 73 to improve maintainability.
　上述のように、逆浸透ろ過装置５に到達する細菌数をゼロにすることは技術的に困難であり、逆浸透ろ過装置５から処理水タンク６に供給される処理水にも細菌が含まれていることが想定される。そこで、水処理システム１２では、照射量制御部２１は、逆浸透ろ過装置５から処理水タンク６に処理水の供給が開始されてから、処理水の供給の終了後所定時間経過するまでの間、紫外線照射装置７における紫外線の照射量を、通常時の照射量よりも増加させる制御を行うように構成されている。例えば、通常時の紫外線の照射量を最大照射量の７０％程度としておき、処理水の供給時の紫外線の照射量を最大照射量の８０％程度とすることができる。これにより、通常時の紫外線の照射量を小さくしても、処理水の細菌を十分に不活化することが可能になり、処理水に含まれる細菌を十分に不活化しつつも、照射量を低減して省エネルギー化及び光源７３の長寿命化が可能になる。 As described above, it is technically difficult to reduce the number of bacteria reaching the reverse osmosis filtration device 5 to zero, and the treated water supplied from the reverse osmosis filtration device 5 to the treated water tank 6 also contains bacteria. It is assumed that Therefore, in the water treatment system 12, the irradiation amount control unit 21 controls the period from when the supply of the treated water from the reverse osmosis filtration device 5 to the treated water tank 6 is started until a predetermined time elapses after the supply of the treated water is completed. In addition, control is performed so that the irradiation amount of ultraviolet rays in the ultraviolet irradiation device 7 is increased from the irradiation amount in a normal state. For example, it is possible to set the irradiation amount of ultraviolet rays in a normal state to about 70% of the maximum irradiation amount, and to set the irradiation amount of ultraviolet rays in supplying the treated water to about 80% of the maximum irradiation amount. This makes it possible to sufficiently inactivate the bacteria in the treated water even when the irradiation amount of the ultraviolet ray in the normal state is reduced, and to reduce the irradiation amount while sufficiently inactivating the bacteria contained in the treated water. It is possible to reduce energy consumption and extend the life of the light source 73.
　また、逆浸透ろ過装置５において逆浸透膜を透過せずに排出された回収水は、活性炭装置や軟水装置４を通過しているため塩素を含んでおらず、逆浸透膜を透過した水が除かれて濃縮された状態となっており、細菌数が多い。そのため、回収水の流量が増え、原水タンク２内において回収水の割合が増えると、原水タンク２内の塩素濃度が薄くなり、原水タンク２内で細菌が繁殖しやすくなってしまう。そこで、水処理システム１２では、照射量制御部２１は、原水タンク２に戻される回収水の増減に応じて、第２紫外線照射装置１０における紫外線の照射量を増減するように構成されている。 In addition, the recovered water discharged without passing through the reverse osmosis membrane in the reverse osmosis filtration device 5 does not contain chlorine because it has passed through the activated carbon device or the soft water device 4, and the water that has passed through the reverse osmosis membrane is It is removed and concentrated, and has a high bacterial count. Therefore, when the flow rate of the recovered water increases and the proportion of the recovered water in the raw water tank 2 increases, the chlorine concentration in the raw water tank 2 decreases, and bacteria easily propagate in the raw water tank 2. Therefore, in the water treatment system 12, the irradiation amount control unit 21 is configured to increase or decrease the irradiation amount of the ultraviolet light in the second ultraviolet irradiation device 10 according to the increase or decrease of the recovered water returned to the raw water tank 2.
　より詳細には、回収水の流量と原水の流量とを検出して、原水タンク２内における回収水と原水の割合（回収水の量／原水の量）を演算し、当該割合が所定の閾値よりも大きい場合には、第２紫外線照射装置１０における紫外線の照射量を強（例えば最大照射量の９０％程度）とし、当該割合が閾値以下である場合には、第２紫外線照射装置１０における紫外線の照射量を弱（例えば最大照射量の５０％程度）とするように照射量制御部２１を構成している。なお、ここでは強と弱の２段階で照射量の制御を行ったが、３段階以上であってもよいし、回収水の量（あるいは原水タンク２内における回収水と原水の割合）に応じて無段階に制御してもよい。さらに、回収水の流量は、例えば、逆浸透ろ過装置５に供給される水量と、逆浸透ろ過装置５から出力される処理水の水量との差から求めることができる。 More specifically, the flow rate of the recovered water and the flow rate of the raw water are detected, and the ratio of the recovered water and the raw water in the raw water tank 2 (the amount of the recovered water / the amount of the raw water) is calculated. If the ratio is larger than the threshold value, the irradiation amount of the ultraviolet ray in the second ultraviolet irradiation device 10 is set to be strong (for example, about 90% of the maximum irradiation amount). The irradiation amount control unit 21 is configured to make the irradiation amount of the ultraviolet light weak (for example, about 50% of the maximum irradiation amount). Here, the irradiation amount was controlled in two stages of strong and weak. However, the irradiation amount may be controlled in three or more stages, or depending on the amount of recovered water (or the ratio of recovered water and raw water in the raw water tank 2). May be controlled steplessly. Further, the flow rate of the recovered water can be determined, for example, from the difference between the amount of water supplied to the reverse osmosis filtration device 5 and the amount of treated water output from the reverse osmosis filtration device 5.
　なお、図４Ａのように、処理水出口１ｂの前段に紫外線照射装置７を設ける場合においても、紫外線照射装置７における紫外線の照射量を制御可能とすることは可能である。例えば、血液浄化装置等の処理水使用装置に供給する処理水（処理水出口１ｂから出力する処理水）の増減に応じて、紫外線照射装置７における紫外線の照射量を増減するように照射量制御部２１を構成することで、処理水に含まれる細菌を十分に不活化しつつも、照射量を低減して省エネルギー化及び光源７３の長寿命化が可能になる。 In addition, as shown in FIG. 4A, even when the ultraviolet irradiation device 7 is provided in a stage preceding the treated water outlet 1 b, it is possible to control the irradiation amount of the ultraviolet light in the ultraviolet irradiation device 7. For example, the irradiation amount control is performed such that the irradiation amount of the ultraviolet light in the ultraviolet irradiation device 7 is increased or decreased according to the increase or decrease of the treated water (the treated water output from the treated water outlet 1b) supplied to the treated water using device such as a blood purification device. By configuring the unit 21, it is possible to save energy and extend the life of the light source 73 by reducing the irradiation amount while sufficiently inactivating bacteria contained in the treated water.
　また、照射量制御部２１は、外部装置からの制御信号に基づき、紫外線照射装置７及び第２紫外線照射装置１０における紫外線の照射量を制御可能に構成してもよい。例えば、血液浄化治療においては、治療内容によって、要求される処理水の清浄度が異なる。そこで、例えば、透析液供給装置から実施する治療内容を示す制御信号を受信し、受信した制御信号に含まれる治療内容の情報に応じて、紫外線照射装置７及び第２紫外線照射装置１０における紫外線の照射量を制御するように照射量制御部２１を構成してもよい。例えば、補液を行う血液ろ過透析（ＨＤＦ）等の治療を行う際に、紫外線照射装置７における紫外線の照射量を、通常時よりも増加させるように照射量制御部２１を構成してもよい。 The irradiation amount control unit 21 may be configured to be able to control the irradiation amount of the ultraviolet light in the ultraviolet irradiation device 7 and the second ultraviolet irradiation device 10 based on a control signal from an external device. For example, in blood purification treatment, required cleanliness of treated water differs depending on the treatment content. Therefore, for example, a control signal indicating the treatment content to be performed is received from the dialysis fluid supply device, and the ultraviolet rays in the ultraviolet irradiation device 7 and the second ultraviolet irradiation device 10 are changed according to the information of the treatment content included in the received control signal. The dose controller 21 may be configured to control the dose. For example, when performing treatment such as hemofiltration dialysis (HDF) for performing fluid replacement, the irradiation amount control unit 21 may be configured to increase the irradiation amount of ultraviolet light in the ultraviolet irradiation device 7 as compared with normal time.
　外部装置からの制御信号によらず、水処理システム１２に設けられた操作盤等の入力部（不図示）からの入力に応じて、紫外線照射装置７及び第２紫外線照射装置１０における紫外線の照射量を手動で制御可能に構成してもよい。例えば、検査により処理水に含まれる菌数が多いと判断された場合に、強制的に紫外線の照射量を増加させることが可能である。 Irradiation of ultraviolet rays in the ultraviolet irradiation device 7 and the second ultraviolet irradiation device 10 according to an input from an input unit (not shown) such as an operation panel provided in the water treatment system 12 without depending on a control signal from an external device. The amount may be manually controllable. For example, when it is determined by inspection that the number of bacteria contained in the treated water is large, it is possible to forcibly increase the irradiation amount of ultraviolet rays.
　さらに、水処理システム１２の内部の配管を洗浄消毒する洗浄消毒処理時には、紫外線照射装置７及び第２紫外線照射装置１０による紫外線の照射は不要となるため、洗浄消毒処理のときに、紫外線照射装置７及び第２紫外線照射装置１０において紫外線の照射を行わないように照射量制御部２１を構成してもよい。なお、洗浄消毒処理は、熱水や洗浄消毒用の薬品を用いて内部配管の洗浄消毒を行う処理である。 Further, at the time of the cleaning and disinfecting process for cleaning and disinfecting the pipes inside the water treatment system 12, the ultraviolet irradiation by the ultraviolet irradiation device 7 and the second ultraviolet irradiating device 10 becomes unnecessary. The irradiation amount control unit 21 may be configured so that the irradiation of ultraviolet rays is not performed in the seventh and second ultraviolet irradiation devices 10. Note that the cleaning / disinfecting process is a process of cleaning and disinfecting the internal piping using hot water or a chemical for cleaning / disinfecting.
　さらにまた、洗浄消毒処理の直後には、細菌による汚染が少ないため、紫外線照射装置７による紫外線の照射量を、通常時よりも減少させるようにしてもよい。より具体的には、照射量制御部２１は、洗浄消毒処理の終了後所定時間経過するまでの間、紫外線照射装置７における紫外線の照射量を、通常時の照射量よりも減少させる制御を行うように構成してもよい。 Further, immediately after the cleaning and disinfecting treatment, the amount of ultraviolet irradiation by the ultraviolet irradiating device 7 may be made smaller than usual, because the contamination by bacteria is small. More specifically, the irradiation amount control unit 21 performs control to reduce the irradiation amount of ultraviolet light in the ultraviolet irradiation device 7 from the normal irradiation amount until a predetermined time elapses after the end of the cleaning / disinfecting processing. It may be configured as follows.
　また、照射量制御部２１は、紫外線照射装置７における紫外線の照射量、及び照射時間を含むデータベースを作成し、当該データベースを記憶部２４に記憶するように構成してもよい。データベースには、供給される原水の流量や、処理水出口１ｂより出力される処理水の流量等の情報が含まれてもよい。また、記憶部２４に記憶されたデータベースは、管理装置等の外部装置によって読み取り可能とされるとよい。これにより、実際に清浄度を検査した結果（菌数測定等の結果）と併せて、紫外線の照射量等に対する清浄度の相関関係を得ることができ、紫外線の照射量を微調整する等して、より効率のよい運用が可能になる。 The irradiation amount control unit 21 may be configured to create a database including the irradiation amount and irradiation time of ultraviolet rays in the ultraviolet irradiation device 7 and store the database in the storage unit 24. The database may include information such as the flow rate of the supplied raw water and the flow rate of the treated water output from the treated water outlet 1b. Further, the database stored in the storage unit 24 may be readable by an external device such as a management device. This makes it possible to obtain the correlation of the cleanliness with respect to the irradiation amount of ultraviolet rays and the like, together with the results of the actual inspection of the cleanliness (results of the measurement of the number of bacteria, etc.), and fine-tune the irradiation amount of ultraviolet rays. Thus, more efficient operation becomes possible.
（実施の形態のまとめ）
　次に、以上説明した実施の形態から把握される技術思想について、実施の形態における符号等を援用して記載する。ただし、以下の記載における各符号等は、特許請求の範囲における構成要素を実施の形態に具体的に示した部材等に限定するものではない。 (Summary of Embodiment)
Next, technical ideas grasped from the embodiments described above will be described with reference to the reference numerals and the like in the embodiments. However, each reference numeral and the like in the following description does not limit the components in the claims to members and the like specifically shown in the embodiments.
［１］逆浸透膜により処理水を生成する逆浸透ろ過装置（５）と、前記逆浸透ろ過装置（５）からの処理水に紫外光を照射する紫外線照射装置（７）と、を備え、前記紫外線照射装置（７）が照射する紫外光は、その中心波長が波長２５５ｎｍ以上３５０ｎｍ以下であって、かつ、波長２５５ｎｍ未満の光を含まない、水処理システム（１）。 [1] A reverse osmosis filtration device (5) for generating treated water by a reverse osmosis membrane, and an ultraviolet irradiation device (7) for irradiating treated water from the reverse osmosis filtration device (5) with ultraviolet light, The water treatment system (1), wherein the ultraviolet light irradiated by the ultraviolet irradiation device (7) has a center wavelength of 255 nm or more and 350 nm or less and does not include light having a wavelength of less than 255 nm.
［２］前記紫外線照射装置（７）の光源（７３）が、発光ダイオードである、［１］に記載の水処理システム（１）。 [2] The water treatment system (1) according to [1], wherein the light source (73) of the ultraviolet irradiation device (7) is a light emitting diode.
［３］前記紫外線照射装置（７）は、前記処理水を流す流路（７１）を有し、当該流路（７１）を流れる前記処理水に紫外線を照射する、［１］または［２］に記載の水処理システム（１）。 [3] The ultraviolet irradiation device (7) has a flow path (71) through which the treated water flows, and irradiates the treated water flowing through the flow path (71) with ultraviolet light, [1] or [2]. Water treatment system (1) according to 1.
［４］前記逆浸透ろ過装置（５）からの処理水を貯留する処理水タンク（６）と、前記処理水タンク（６）に出入口が接続された循環流路（８）と、前記処理水タンク（６）内の処理水を前記循環流路（８）に流通させる循環ポンプ（９）と、を備え、前記紫外線照射装置（７）は、前記循環流路（８）に設けられている、［３］に記載の水処理システム（１）。 [4] A treated water tank (6) for storing treated water from the reverse osmosis filtration device (5), a circulation flow path (8) having an inlet / outlet connected to the treated water tank (6), A circulation pump (9) for flowing the treated water in the tank (6) through the circulation channel (8), and the ultraviolet irradiation device (7) is provided in the circulation channel (8). Water treatment system (1) according to [3].
［５］原水取入口（１ａ）と前記逆浸透ろ過装置（５）との間に、前記原水取入口（１ａ）から前記逆浸透ろ過装置（５）へと流れる水に紫外光を照射する第２紫外線照射装置（１０）をさらに備えた、［１］乃至［４］の何れか１項に記載の水処理システム（１１）。 [5] Between the raw water inlet (1a) and the reverse osmosis filtration device (5), the water flowing from the raw water intake (1a) to the reverse osmosis filtration device (5) is irradiated with ultraviolet light. (2) The water treatment system (11) according to any one of [1] to [4], further including an ultraviolet irradiation device (10).
［６］逆浸透膜により処理水を生成する逆浸透ろ過装置（５）と、前記逆浸透ろ過装置（５）からの処理水に紫外光を照射する紫外線照射装置（７）と、を備え、前記紫外線照射装置（７）が照射する紫外光は、その中心波長が波長２５５ｎｍ以上３５０ｎｍ以下であって、かつ、波長２５５ｎｍ未満の光を含まず、前記紫外線照射装置（７）における紫外線の照射量を制御可能な照射量制御部（２１）をさらに備えた、水処理システム（１２）。 [6] A reverse osmosis filtration device (5) for generating treated water by a reverse osmosis membrane, and an ultraviolet irradiation device (7) for irradiating treated water from the reverse osmosis filtration device (5) with ultraviolet light, The ultraviolet light irradiated by the ultraviolet irradiation device (7) has a center wavelength of not less than 255 nm and not more than 350 nm and does not include light having a wavelength of less than 255 nm, and the amount of ultraviolet irradiation in the ultraviolet irradiation device (7). Water treatment system (12), further comprising an irradiation amount control unit (21) capable of controlling the irradiation amount.
［７］前記逆浸透ろ過装置（５）からの処理水を貯留する処理水タンク（６）と、前記処理水タンク（６）に出入口が接続された循環流路（８）と、前記処理水タンク（６）内の処理水を前記循環流路（８）に流通させる循環ポンプ（９）と、を備え、前記紫外線照射装置（７）は、前記循環流路（８）に設けられており、前記照射量制御部（２１）は、前記逆浸透ろ過装置（５）から前記処理水タンク（６）に処理水の供給が開始されてから、前記処理水の供給の終了後所定時間経過するまでの間、前記紫外線照射装置（７）における紫外線の照射量を、通常時の照射量よりも増加させる制御を行う、［６］に記載の水処理システム（１２）。 [7] A treated water tank (6) for storing treated water from the reverse osmosis filtration device (5), a circulation flow path (8) having an inlet / outlet connected to the treated water tank (6), A circulation pump (9) for flowing the treated water in the tank (6) through the circulation channel (8), and the ultraviolet irradiation device (7) is provided in the circulation channel (8). The irradiation amount control unit (21) is configured to start the supply of the treated water from the reverse osmosis filtration device (5) to the treated water tank (6), and then lapse a predetermined time after the supply of the treated water is completed. The water treatment system (12) according to [6], wherein control is performed such that the irradiation amount of the ultraviolet light in the ultraviolet irradiation device (7) is increased from the irradiation amount in a normal state.
［８］前記紫外線照射装置（７）は、処理水使用装置に処理水を供給する処理水出口（１ｂ）の前段に設けられ、前記紫外線照射装置（７）により紫外線を照射した処理水を前記処理水出口（１ｂ）より供給するように構成されており、前記照射量制御部（２１）は、前記処理水使用装置に供給する処理水の増減に応じて、前記紫外線照射装置（７）における紫外線の照射量を増減するように構成されている、［６］に記載の水処理システム（１２）。 [8] The ultraviolet irradiation device (7) is provided in front of a treated water outlet (1b) for supplying treated water to a treated water using device, and treats the treated water irradiated with ultraviolet light by the ultraviolet irradiation device (7) to the treated water. The irradiation amount control unit (21) is configured to supply the treated water from the treated water outlet (1b). The water treatment system (12) according to [6], wherein the water treatment system is configured to increase or decrease the irradiation amount of the ultraviolet light.
［９］原水取入口（１ａ）と前記逆浸透ろ過装置（５）との間に、前記原水取入口（１ａ）から前記逆浸透ろ過装置（５）へと流れる水に紫外光を照射する第２紫外線照射装置（１０）をさらに備え、前記照射量制御部（２１）は、前記第２紫外線照射装置（１０）における紫外線の照射量を制御可能に構成されている、［６］乃至［８］の何れか１項に記載の水処理システム（１２）。 [9] A method of irradiating ultraviolet light to water flowing from the raw water intake (1a) to the reverse osmosis filtration device (5) between the raw water intake (1a) and the reverse osmosis filtration device (5). (2) An ultraviolet irradiation device (10) is further provided, and the irradiation amount control section (21) is configured to be capable of controlling the irradiation amount of ultraviolet light in the second ultraviolet irradiation device (10). ] The water treatment system (12) according to any one of the above.
［１０］前記原水取入口（１ａ）から導入された原水を貯留する原水タンク（２）と、前記逆浸透ろ過装置（５）からの回収水を前記原水タンク（２）に戻す回収水流路（２３）と、を備え、前記照射量制御部（２１）は、前記原水タンク（２）に戻される回収水の増減に応じて、前記第２紫外線照射装置（１０）における紫外線の照射量を増減するように構成されている、［９］に記載の水処理システム（１２）。 [10] A raw water tank (2) for storing raw water introduced from the raw water inlet (1a), and a recovered water flow path for returning recovered water from the reverse osmosis filtration device (5) to the raw water tank (2) ( 23), wherein the irradiation amount control unit (21) increases or decreases the irradiation amount of the ultraviolet light in the second ultraviolet irradiation device (10) according to the increase or decrease of the recovered water returned to the raw water tank (2). The water treatment system (12) according to [9], wherein the water treatment system is configured to:
［１１］前記照射量制御部（２１）は、外部装置からの制御信号に基づき、前記紫外線照射装置（７）における紫外線の照射量を制御可能に構成されている、［６］乃至［１０］の何れか１項に記載の水処理システム（１２）。 [11] The irradiation amount control section (21) is configured to be capable of controlling the irradiation amount of the ultraviolet light in the ultraviolet irradiation device (7) based on a control signal from an external device, [6] to [10]. Water treatment system (12) according to any one of the preceding claims.
［１２］前記照射量制御部（２１）は、内部の配管を洗浄消毒する洗浄消毒処理のとき、前記紫外線照射装置（７）において紫外線の照射を行わないように構成されている、［６］乃至［１１］の何れか１項に記載の水処理システム（１２）。 [12] The irradiation amount control unit (21) is configured not to irradiate the ultraviolet irradiation device (7) with ultraviolet light during the cleaning and disinfecting process for cleaning and disinfecting the internal piping, [6]. A water treatment system (12) according to any one of claims 1 to 11.
［１３］前記照射量制御部（２１）は、前記洗浄消毒処理の終了後所定時間経過するまでの間、前記紫外線照射装置（７）における紫外線の照射量を、通常時の照射量よりも減少させる制御を行う、［１２］に記載の水処理システム（１２）。 [13] The irradiation amount control unit (21) reduces the irradiation amount of the ultraviolet light in the ultraviolet irradiation device (7) from the normal irradiation amount until a predetermined time elapses after the completion of the cleaning / disinfecting process. The water treatment system (12) according to [12], wherein the water treatment system performs control to cause the water treatment to be performed.
［１４］前記照射量制御部（２１）は、前記紫外線照射装置（７）における紫外線の照射量、及び照射時間を含むデータベースを作成し、当該データベースを記憶部（２４）に記憶するように構成されている、［６］乃至［１３］の何れか１項に記載の水処理システム（１２）。 [14] The irradiation amount control unit (21) is configured to create a database including the amount of irradiation of ultraviolet light and the irradiation time in the ultraviolet irradiation device (7), and store the database in the storage unit (24). The water treatment system (12) according to any one of [6] to [13].
　以上、本発明の実施の形態を説明したが、上記に記載した実施の形態は請求の範囲に係る発明を限定するものではない。また、実施の形態の中で説明した特徴の組合せの全てが発明の課題を解決するための手段に必須であるとは限らない点に留意すべきである。 Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. Also, it should be noted that not all combinations of the features described in the embodiments are necessarily essential for solving the problem of the invention.
　また、本発明は、その趣旨を逸脱しない範囲で適宜変形して実施することが可能である。例えば、上記実施の形態では、水処理システム１，１１，１２で生成した処理水を血液浄化治療に用いる場合について説明したが、水処理システム１，１１，１２で生成した処理水の用途はこれに限定されるものではなく、例えば、手術用の水、半導体の洗浄用の水、薬品製造用の水に用いることができる。 The present invention can be appropriately modified and implemented without departing from the spirit thereof. For example, in the above embodiment, the case where the treated water generated by the water treatment systems 1, 11, and 12 is used for blood purification treatment, but the use of the treated water generated by the water treatment systems 1, 11, and 12 is However, the present invention is not limited thereto, and may be used, for example, as water for surgery, water for cleaning semiconductors, and water for manufacturing chemicals.
１…水処理システム
１ａ…原水取入口
１ｂ…処理水出口
２…原水タンク
３…活性炭装置
４…軟水装置
５…逆浸透ろ過装置
６…処理水タンク
７…紫外線照射装置
７１…流路
７３…光源
８…循環流路
９…循環ポンプ
１０…第２紫外線照射装置
２１…照射量制御部
２３…回収水流路
２４…記憶部 DESCRIPTION OF SYMBOLS 1 ... Water treatment system 1a ... Raw water intake 1b ... Treated water outlet 2 ... Raw water tank 3 ... Activated carbon device 4 ... Soft water device 5 ... Reverse osmosis filtration device 6 ... Treated water tank 7 ... Ultraviolet irradiation device 71 ... Channel 73 ... Light source 8 Circulating channel 9 Circulating pump 10 Second ultraviolet irradiation device 21 Irradiation amount control unit 23 Recovered water channel 24 Storage unit

Claims (14)

  1. 　逆浸透膜により処理水を生成する逆浸透ろ過装置と、
    　前記逆浸透ろ過装置からの処理水に紫外光を照射する紫外線照射装置と、を備え、
    　前記紫外線照射装置が照射する紫外光は、その中心波長が波長２５５ｎｍ以上３５０ｎｍ以下であって、かつ、波長２５５ｎｍ未満の光を含まない、
    　水処理システム。     A reverse osmosis filtration device that generates treated water with a reverse osmosis membrane,
    An ultraviolet irradiation device that irradiates the treated water from the reverse osmosis filtration device with ultraviolet light,
    The ultraviolet light emitted by the ultraviolet irradiation device has a center wavelength of 255 nm or more and 350 nm or less, and does not include light having a wavelength of less than 255 nm.
    Water treatment system.
  2. 　前記紫外線照射装置の光源が、発光ダイオードである、
    　請求項１に記載の水処理システム。     The light source of the ultraviolet irradiation device is a light emitting diode,
    The water treatment system according to claim 1.
  3. 　前記紫外線照射装置は、前記処理水を流す流路を有し、当該流路を流れる前記処理水に紫外線を照射する、
    　請求項１または２に記載の水処理システム。     The ultraviolet irradiation device has a flow path through which the treated water flows, and irradiates the treated water flowing through the flow path with ultraviolet light.
    The water treatment system according to claim 1.
  4. 　前記逆浸透ろ過装置からの処理水を貯留する処理水タンクと、
    　前記処理水タンクに出入口が接続された循環流路と、
    　前記処理水タンク内の処理水を前記循環流路に流通させる循環ポンプと、を備え、
    　前記紫外線照射装置は、前記循環流路に設けられている、
    　請求項３に記載の水処理システム。     A treated water tank that stores treated water from the reverse osmosis filtration device,
    A circulation channel having an inlet / outlet connected to the treated water tank,
    A circulation pump for flowing the treated water in the treated water tank through the circulation flow path,
    The ultraviolet irradiation device is provided in the circulation channel,
    The water treatment system according to claim 3.
  5. 　原水取入口と前記逆浸透ろ過装置との間に、前記原水取入口から前記逆浸透ろ過装置へと流れる水に紫外光を照射する第２紫外線照射装置をさらに備えた、
    　請求項１乃至４の何れか１項に記載の水処理システム。     Between the raw water intake and the reverse osmosis filtration device, further comprising a second ultraviolet irradiation device that irradiates ultraviolet light to water flowing from the raw water intake to the reverse osmosis filtration device,
    The water treatment system according to claim 1.
  6. 　逆浸透膜により処理水を生成する逆浸透ろ過装置と、
    　前記逆浸透ろ過装置からの処理水に紫外光を照射する紫外線照射装置と、を備え、
    　前記紫外線照射装置が照射する紫外光は、その中心波長が波長２５５ｎｍ以上３５０ｎｍ以下であって、かつ、波長２５５ｎｍ未満の光を含まず、
    　前記紫外線照射装置における紫外線の照射量を制御可能な照射量制御部をさらに備えた、
    　水処理システム。     A reverse osmosis filtration device that generates treated water with a reverse osmosis membrane,
    An ultraviolet irradiation device that irradiates the treated water from the reverse osmosis filtration device with ultraviolet light,
    The ultraviolet light emitted by the ultraviolet irradiation device has a center wavelength of not less than 255 nm and not more than 350 nm, and does not include light having a wavelength of less than 255 nm,
    Further comprising an irradiation amount control unit capable of controlling the irradiation amount of ultraviolet light in the ultraviolet irradiation device,
    Water treatment system.
  7. 　前記逆浸透ろ過装置からの処理水を貯留する処理水タンクと、
    　前記処理水タンクに出入口が接続された循環流路と、
    　前記処理水タンク内の処理水を前記循環流路に流通させる循環ポンプと、を備え、
    　前記紫外線照射装置は、前記循環流路に設けられており、
    　前記照射量制御部は、前記逆浸透ろ過装置から前記処理水タンクに処理水の供給が開始されてから、前記処理水の供給の終了後所定時間経過するまでの間、前記紫外線照射装置における紫外線の照射量を、通常時の照射量よりも増加させる制御を行う、
    　請求項６に記載の水処理システム。     A treated water tank that stores treated water from the reverse osmosis filtration device,
    A circulation channel having an inlet / outlet connected to the treated water tank,
    A circulation pump for flowing the treated water in the treated water tank through the circulation flow path,
    The ultraviolet irradiation device is provided in the circulation channel,
    The irradiation amount control unit is configured to control the amount of the ultraviolet light in the ultraviolet irradiation device from when the supply of the treated water to the treated water tank is started from the reverse osmosis filtration device until a predetermined time elapses after the supply of the treated water is completed. Control to increase the irradiation amount of the normal irradiation amount,
    The water treatment system according to claim 6.
  8. 　前記紫外線照射装置は、処理水使用装置に処理水を供給する処理水出口の前段に設けられ、前記紫外線照射装置により紫外線を照射した処理水を前記処理水出口より供給するように構成されており、
    　前記照射量制御部は、前記処理水使用装置に供給する処理水の増減に応じて、前記紫外線照射装置における紫外線の照射量を増減するように構成されている、
    　請求項６に記載の水処理システム。     The ultraviolet irradiation device is provided in front of a treated water outlet that supplies treated water to a treated water using device, and is configured to supply treated water irradiated with ultraviolet rays by the ultraviolet irradiation device from the treated water outlet. ,
    The irradiation amount control unit is configured to increase or decrease the irradiation amount of the ultraviolet light in the ultraviolet irradiation device according to the increase or decrease of the treatment water supplied to the treatment water using device,
    The water treatment system according to claim 6.
  9. 　原水取入口と前記逆浸透ろ過装置との間に、前記原水取入口から前記逆浸透ろ過装置へと流れる水に紫外光を照射する第２紫外線照射装置をさらに備え、
    　前記照射量制御部は、前記第２紫外線照射装置における紫外線の照射量を制御可能に構成されている、
    　請求項６乃至８の何れか１項に記載の水処理システム。     Between the raw water intake and the reverse osmosis filtration device, further comprising a second ultraviolet irradiation device that irradiates ultraviolet light to water flowing from the raw water intake to the reverse osmosis filtration device,
    The irradiation amount control unit is configured to be able to control the irradiation amount of ultraviolet light in the second ultraviolet irradiation device,
    The water treatment system according to claim 6.
  10. 　前記原水取入口から導入された原水を貯留する原水タンクと、
    　前記逆浸透ろ過装置からの回収水を前記原水タンクに戻す回収水流路と、を備え、
    　前記照射量制御部は、前記原水タンクに戻される回収水の増減に応じて、前記第２紫外線照射装置における紫外線の照射量を増減するように構成されている、
    　請求項９に記載の水処理システム。     A raw water tank for storing raw water introduced from the raw water intake,
    A recovered water flow path for returning the recovered water from the reverse osmosis filtration device to the raw water tank,
    The irradiation amount control unit is configured to increase or decrease the irradiation amount of the ultraviolet light in the second ultraviolet irradiation device according to the increase or decrease of the recovered water returned to the raw water tank.
    The water treatment system according to claim 9.
  11. 　前記照射量制御部は、外部装置からの制御信号に基づき、前記紫外線照射装置における紫外線の照射量を制御可能に構成されている、
    　請求項６乃至１０の何れか１項に記載の水処理システム。     The irradiation amount control unit is configured to be able to control the irradiation amount of ultraviolet light in the ultraviolet irradiation device based on a control signal from an external device,
    The water treatment system according to any one of claims 6 to 10.
  12. 　前記照射量制御部は、内部の配管を洗浄消毒する洗浄消毒処理のとき、前記紫外線照射装置において紫外線の照射を行わないように構成されている、
    　請求項６乃至１１の何れか１項に記載の水処理システム。     The irradiation amount control unit is configured to not perform ultraviolet irradiation in the ultraviolet irradiation device during a cleaning and disinfecting process of cleaning and disinfecting an internal pipe,
    The water treatment system according to claim 6.
  13. 　前記照射量制御部は、前記洗浄消毒処理の終了後所定時間経過するまでの間、前記紫外線照射装置における紫外線の照射量を、通常時の照射量よりも減少させる制御を行う、
    　請求項１２に記載の水処理システム。     The irradiation amount control unit performs control to reduce the irradiation amount of ultraviolet light in the ultraviolet irradiation device from a normal irradiation amount until a predetermined time elapses after the end of the cleaning and disinfecting processing.
    The water treatment system according to claim 12.
  14. 　前記照射量制御部は、前記紫外線照射装置における紫外線の照射量、及び照射時間を含むデータベースを作成し、当該データベースを記憶部に記憶するように構成されている、
    　請求項６乃至１３の何れか１項に記載の水処理システム。     The irradiation amount control unit is configured to create a database including the irradiation amount of the ultraviolet light in the ultraviolet irradiation device, and the irradiation time, and to store the database in a storage unit.
    The water treatment system according to any one of claims 6 to 13.
PCT/JP2019/024736 2018-06-28 2019-06-21 Water treatment system WO2020004272A1 (en)

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