Water treatment apparatus and water treatment monitoring method

Abstract

To rapidly and easily obtain water for appropriately controlling water quality.SOLUTION: The water treatment apparatus has a plurality of apparatus sets in each of which a UV and a CP for subjecting supplied water to be treated to predetermined treatment are connected in series in the order of the UV and the CP, and the plurality of apparatus sets 110 - 0 and 1,110 - 2 are connected to each other in series only through piping or only through an apparatus and piping whose residence time is 15 min or less.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a water treatment device and a water treatment monitoring method. [Background technology]

[0002] In water treatment systems, such as ultrapure water production systems that produce ultrapure water from raw water, the quality of the raw water supplied to the system must also be taken into consideration. These systems use reverse osmosis (RO) and ultraviolet (UV) oxidation processes to remove organic matter (TOC: total organic carbon) from the raw water. However, some organic components are easily removed by these processes, while others are not. Until now, tap water and industrial water have been used as the raw water supplied to ultrapure water production systems. In recent years, in order to efficiently utilize water resources, reclaimed water and recycled water, such as industrial wastewater, have been used as the raw water. The presence of difficult-to-remove organic matter (including TOC components excluding TOC components, which are difficult to remove) in the raw water can affect the quality of the ultrapure water supplied from the outlet of the ultrapure water production system. TOC components that are difficult to remove using reverse osmosis membrane treatment in RO or ultraviolet oxidation treatment in UV, especially those that are difficult to decompose and remove using standard ultraviolet oxidation treatment, are called "persistent TOC components." For example, urea is known to be difficult to remove using reverse osmosis membrane treatment or standard ultraviolet oxidation treatment, and is classified as a "persistent TOC component." Other organic substances besides urea are known to behave as "persistent TOC components." If persistent TOC components are mixed into raw water, they may affect the quality of treated water at the outlet of water treatment systems such as ultrapure water production systems. Furthermore, even if they are not "persistent TOC components," there are organic substances in raw water that can have a significant impact on treated water quality. For example, it is known that volatile organic compounds (VOCs) such as toluene and xylene, trihalomethanes such as chloroform and bromoform, tetramethylammonium hydroxide (TMAH), and low-molecular-weight alcohols cannot be completely removed by reverse osmosis membrane treatment or ultraviolet oxidation treatment if they are present in high concentrations in raw water, and may affect the quality of the treated water in the water treatment system.Therefore, it is becoming increasingly important to monitor the quality of raw water in ultrapure water production systems and to appropriately manage the operation of the ultrapure water production systems in accordance with the water quality.

[0003] Patent Document 1 discloses an ultrapure water production system that monitors the quality of raw water, including a main ultrapure water production system that produces ultrapure water to be supplied to a point of use and a sub ultrapure water production system that monitors and controls the quality of the raw water. The sub ultrapure water production system has a configuration equivalent to that of the main ultrapure water production system and produces ultrapure water of equivalent quality to that produced by the main ultrapure water production system. The TOC concentration of the ultrapure water produced by the sub ultrapure water production system is measured, the quality of the raw water is evaluated based on the measured TOC concentration, and the amount of raw water supplied to the main ultrapure water production system is controlled. In the system described in Patent Document 1, for example, if the TOC concentration of the ultrapure water produced by the sub ultrapure water production system is high, control is performed such as stopping the supply of raw water to the main ultrapure water production system, supplying raw water treated using a urea removal device to the main ultrapure water production system, or increasing the amount of ultraviolet light irradiated on the raw water by an ultraviolet light irradiation device.

[0004] Patent Document 2 discloses the provision of a pure water production unit for evaluation, which is equipped with a TOC removal device that performs a unit operation to remove TOC components, separate from the water treatment system. Here, the water to be supplied to the water treatment system is treated as the target water, and the TOC concentration is measured at multiple measurement points, including the inlet and outlet of the pure water production unit for evaluation. The TOC concentration values ​​measured at the multiple measurement points are analyzed to evaluate the target water. The supply of the target water to the water treatment system is then controlled based on the evaluation results. For example, if the target water, which is raw water, is determined to contain persistent TOC components, control is performed, such as not supplying the raw water to the water treatment system.

[0005] Patent Document 3 discloses a water treatment management system and a water quality monitoring method, specifically a technology for accurately measuring the TOC concentration of water supplied to a water treatment system without being affected by IC (inorganic carbon) components. This system removes TOC components through a pure water production unit for evaluation, which includes RO, UV, and an ion exchanger filled device. The system also includes a measuring unit that removes inorganic carbon from the water to be measured using an inorganic carbon removal means (EDI) and measures the TOC concentration. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-107249 [Patent Document 2] Japanese Patent Application Publication No. 2019-155275 [Patent Document 3] Japanese Patent Application Publication No. 2023-150986 Summary of the Invention [Problem to be solved by the invention]

[0007] The above-mentioned techniques have the problem that water for proper water quality management cannot be obtained quickly and easily.

[0008] An object of the present invention is to provide a water treatment apparatus and a water treatment monitoring method that can quickly and easily obtain water for appropriate water quality management. [Means for solving the problem]

[0009] The water treatment device of the present invention comprises: The system has a plurality of sets of ultraviolet irradiation devices and ion exchange resin charging devices that perform predetermined treatment on supplied water to be treated, the sets being connected in series in the order of the ultraviolet irradiation device and the ion exchange resin charging device, The plurality of device sets are connected in series to each other only through piping or only through devices and piping with a residence time of 15 minutes or less.

[0010] Further, the water treatment monitoring method of the present invention includes: In a water treatment device, a plurality of equipment sets, each of which is connected in series in the order of ultraviolet irradiation equipment and ion exchange resin charging equipment, each of which performs a predetermined treatment on supplied water to be treated, are connected to each other only through piping or equipment and piping having a residence time of 15 minutes or less, and the water to be treated is supplied to the equipment set located at the front stage; and measuring the quality of the outlet water of at least one of the plurality of device sets. [Effects of the Invention]

[0011] In the present invention, water for proper water quality management can be obtained quickly and easily. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a diagram showing an embodiment of a water treatment system to which a water treatment device of the present invention is applied. [Figure 2] 1 is a diagram showing a first embodiment of a water treatment device of the present invention. [Figure 3] 3 is a flowchart illustrating an example of a water treatment monitoring method in the water treatment device shown in FIG. 2. [Figure 4] FIG. 1 is a diagram illustrating the configuration of a first device example. [Figure 5] FIG. 10 is a diagram illustrating the configuration of a second device example. [Figure 6] FIG. 2 is a diagram showing a second embodiment of a water treatment device according to the present invention. [Figure 7] FIG. 10 shows an embodiment of a water treatment device in which an inter-set device is disposed between two device sets. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0014] Fig. 1 is a diagram showing one embodiment of a water treatment system to which the water treatment device of the present invention is applied. As shown in Fig. 1, water to be treated is supplied to a water production system 3 and is supplied to a water treatment device 100 of the present invention. The water to be treated is stored in a water tank 2 via a valve 1, and is supplied from the water tank 2 to the water production system 3 using a pump or the like.

[0015] The water production system 3 includes a sand filtration unit 301, an activated carbon unit (AC302), a heat exchanger (HEX303), a reverse osmosis membrane unit (RO304), an ultraviolet irradiation unit (UV305), an ion exchange unit (IER306), a degassing unit (DG307), a tank 308, a HEX309, a UV310, a ion exchange resin filling unit (CP311), a degassing membrane unit (MD312), and an ultrafiltration membrane unit (UF313). These components are connected in series in the order described above. Treated water from the UF313 is supplied to the point of use as ultrapure water. A portion of the treated water from the UF313 is returned to the tank 308. The sand filtration unit 301, AC302, HEX303, RO304, UV305, IER306, and DG307 constitute a pretreatment system and a primary pure water production system. Tank 308, HEX 309, UV 310, CP 311, MD 312 and UF 313 constitute a secondary pure water production system called a subsystem.

[0016] The water treatment device 100 is a monitoring device that performs a predetermined treatment on water to be treated that is supplied to the water production system 3, and monitors the quality of treated water (ultrapure water) obtained by treating the water to be treated by the water production system 3. The water treatment device 100 may also perform a predetermined treatment on outlet water from the AC 302 or RO 304 provided in the water production system 3, and monitor the quality of treated water obtained by treating the water to be treated by the water production system 3. (First embodiment)

[0017] FIG. 2 is a diagram showing a first embodiment of a water treatment device of the present invention. The water treatment device 100 shown in FIG. 2 is disposed in the position of the water treatment device 100 shown in FIG. 1. As shown in FIG. 2, the water treatment device 100 of this embodiment includes an RO10, an EDI11, an MD12, a UV13-1, a CP14-1, a UV13-2, and a CP14-2, which are connected in series in this order. UV13-1 and CP14-1 form a device set 110-1. UV13-2 and CP14-2 form a device set 110-2. CP14-1 of device set 110-1 and UV13-2 of device set 110-2 are connected only via piping. While FIG. 2 shows an example in which there are two device sets, there may be three or more device sets. Even when there are three or more device sets, they are still connected only via piping. RO10, UV13-1, 13-2 and CP14-1, 14-2 are all TOC removal devices that perform a unit operation to remove TOC components.

[0018] RO10 is a reverse osmosis membrane device that concentrates the water to be treated and discharges concentrated water and permeated water. RO10 may be a multi-stage device in which permeated water from a previous reverse osmosis membrane is supplied to a subsequent reverse osmosis membrane. The type of reverse osmosis membrane used in RO10 is not particularly limited. For example, from the viewpoint of energy saving in pumps, it is preferable to use an ultra-low pressure membrane or an extremely low pressure membrane as the reverse osmosis membrane used in RO10. It is also possible to use an RO membrane with higher permeability than an extremely low pressure membrane. RO10 is preferably operated at a recovery rate of 15 to 50%. Permeated water from RO10 (RO permeate) is supplied to EDI11.

[0019] The EDI 11 is an electrodeionization water production device that removes inorganic carbon. The EDI 11 can be placed between the RO 10 and the UV 13-1 to improve the TOC removal efficiency in the UV 13-1. It is preferable to install the MD 12 downstream of the EDI 11, as shown in Figure 2.

[0020] The MD12 is a degassing membrane device that removes gas from the treated water from the EDI11. The type of MD12 is not particularly limited. Any device that can remove dissolved oxygen can be used as the MD12. For example, the MD12 can be any of a vacuum degassing device, a membrane degassing device, and a nitrogen degassing device.

[0021] UV13-1 is an ultraviolet irradiation device that performs ultraviolet oxidation treatment on treated water from MD12. UV13-2 is an ultraviolet irradiation device that performs ultraviolet oxidation treatment on treated water from CP14-1. The ultraviolet irradiation dose of UV13-1 and 13-2 is not particularly limited. UV13-1 and 13-2 can be, for example, 0.05 to 3 kWh / m 3 The amount of ultraviolet light irradiation from UV13-1 and 13-2 may be adjusted by adjusting the output of UV13-1 and 13-2, by adjusting the flow rate to UV13-1 and 13-2, or by adjusting both the output of UV13-1 and 13-2 and the flow rate to UV13-1 and 13-2.

[0022] CP14-1 and CP14-2 are ion exchange resin filling devices that receive treated water from UV13-1 and UV13-2, respectively, and perform ion exchange treatment. CP14-1 and CP14-2 may be cartridge polishers (CPs) (also called non-regenerative ion exchange devices) filled with a mixed bed of anion exchange resin and cation exchange resin. At least one of CP14-1 and CP14-2 may be an SBP (multi-bed countercurrent regenerative ion exchange device).

[0023] Also provided is a valve 30 that controls the discharge of treated water treated by CP14-2. Also provided is a TOC meter 40 that measures the TOC (Total Organic Carbon) concentration, which indicates the water quality of the treated water. TOC meter 40 is a measuring instrument that measures the water quality values ​​of the inlet water of RO10, the outlet water of MD12, the outlet water of CP14-1, and the outlet water of CP14-2 supplied to the water treatment device 100. Valves 20-1 to 20-4 are respectively disposed between the inlet of RO10, the outlet of MD12, the outlet of CP14-1, and the outlet of CP14-2 and the TOC meter 40, and the target for which TOC meter 40 measures the water quality is selected based on the opening and closing of each of valves 20-1 to 20-4. It should be noted that TOC meter 40 may also measure the water quality values ​​of the outlet water of RO10 and the outlet water of EDI11. Furthermore, the measuring device may be a device that measures water quality other than TOC, such as urea concentration or hydrogen peroxide (hydrogen peroxide), or a measuring device that can measure a combination of multiple components.

[0024] The TOC meter 40 is also provided with a control unit 50. The TOC meter 40 and the control unit 50 are connected to each other so that they can communicate with each other via wired or wireless communication. The TOC meter 40 transmits the measured values ​​to the control unit 50. The control unit 50 acquires the measured values ​​transmitted from the TOC meter 40 and controls the supply of the water to be treated to the water producing system 3 based on the acquired measured values. Specifically, for example, if the acquired measured values ​​exceed a predetermined threshold, the control unit 50 closes valve 1 to stop the supply of the water to be treated to the water producing system 3. Furthermore, if the acquired measured values ​​fall below the predetermined threshold, the control unit 50 opens valve 1 to start the supply of the water to be treated to the water producing system 3. In addition to controlling the supply of the water to be treated to the water producing system 3, the control unit 50 may also control the operation of the water producing system 3 based on the acquired measured values. For example, if the acquired measured values ​​exceed a predetermined threshold, the control unit 50 may increase the amount of treated water circulated from the UF 313 to the tank 308. Furthermore, for example, the control unit 50 may decompose and remove (persistent) TOC components by combining the addition of persulfuric acid (peroxodisulfuric acid) or its salts to the water to be treated with ultraviolet oxidation treatment based on the acquired measurement value. Furthermore, in a configuration in which other water to be treated is supplied to the water tank 2 via other valves, the control unit 50 may control the water to be treated to be supplied to the water production system 3 via the other valves by closing valve 1 and opening the other valves if the acquired measurement value exceeds a predetermined threshold. Furthermore, the control unit 50 may adjust the openings of valve 1 and the other valves to reduce the amount of water to be treated supplied to the water production system 3 via valve 1 and increase the amount of water to be treated supplied to the water production system 3 via the other valves if the acquired measurement value exceeds a predetermined threshold.

[0025] As pretreatment for the raw water supplied to the water treatment device 100, water may be passed through a cartridge filter or activated carbon, or chemicals such as acid or alkali may be added. Pretreatment is particularly required when treating water with a high TOC concentration, such as tap water or recycled water. To prevent clogging of the RO 10, a dispersant or slime control agent may be added to the water to be treated during pretreatment. A heat exchanger may also be added during pretreatment to adjust the temperature of the water to be treated.

[0026] A description will now be given of a water treatment monitoring method in the water treatment device 100 shown in Fig. 2. Fig. 3 is a flowchart for explaining an example of a water treatment monitoring method in the water treatment device 100 shown in Fig. 2.

[0027] First, after the flow of water to be treated into the water treatment device 100 starts (step S1), the control unit 50 determines whether a predetermined time has elapsed (step S2). This predetermined time is the time from when the flow of water to be treated into the water treatment device 100 starts until the water to be treated is treated in the RO 11 and CP 14-2 and discharged. If the predetermined time has elapsed since the flow of water to be treated started, the TOC meter 40 measures the water quality of the treated water (step S3). Based on the water quality value of the outlet water from CP 14-2 measured by the TOC meter 40, the control unit 50 controls the operation of the water production system 3 as described above.

[0028] Below, we will explain the results of a comparison of TOC concentrations when water to be treated was passed through the water treatment device 100 shown in Figure 2 and two other device examples. Figure 4 is a diagram showing the configuration of the first device example. Figure 5 is a diagram showing the configuration of the second device example. As shown in Figure 4, the configuration of the first device example is a configuration in which the UV and CP device set in the water treatment device 100 shown in Figure 2 is one (UV13 and CP14). As shown in Figure 5, the configuration of the second device example is a configuration in which two UVs shown in Figure 4 are connected in parallel (UV13-3 and UV13-4). Table 1 shows the TOC values ​​of the water to be treated (raw water) supplied to each device, the TOC values ​​of the treated water (outlet water) from EDI11, the TOC values ​​of the treated water (outlet water) from CP14-2 or CP14, and the TOC removal rates from EDI11 to the treated water discharged from CP14-2 or CP14. Here, Example 1 shows the results for the water treatment device 100 shown in Fig. 2, Comparative Example 1 shows the results for the first apparatus example shown in Fig. 4, and Comparative Example 2 shows the results for the second apparatus example shown in Fig. 5. In addition, the flow rate of the water to be treated (the treated water of EDI11) in Example 1 and Comparative Example 2 was set to 36 L / h, the flow rate of the water to be treated (the treated water of EDI11) in Comparative Example 1 was set to 18 L / h, and the ultraviolet irradiation dose of each of UV13-1 to 13-4 was set to 2.06÷2=1.03 kWh / m 3 The UV13 ultraviolet radiation dose is 2.06 kWh / m 3 It was decided. [Table 1]

[0029] The specifications of the equipment used here are shown below. <ro11> ESPA2-4021 (Nitto Denko Corporation) Recovery rate: 50%, Flux 0.6 m / d, Membrane area: 3.5 m 2 <UV13,13-1 to 13-4> Low-pressure ultraviolet oxidation device (Photo Science Co., Ltd.) Irradiation dose: 0.5 - 3 kWh / m 3 <CP14,14-1 to 14-2> ESP-2 Organo Co., Ltd. Liquid passing rate: 18 - 180 (L / L-R) / h <TOC meter 40> Online TOC concentration meter m9e (Sievers) Online TOC concentration meter 500RLe (Sievers)

[0030] From the results shown in Table 1, in the water treatment device 100 showing the results of Example 1, since the TOC concentration can be treated to less than 0.2 ppb, it is possible to obtain high-purity water quality. Incidentally, when the same treated water was passed through the water production system 3 shown in FIG. 1 and the TOC concentration of the outlet water of UF313 was measured, it was 0.2 ppb or less. On the other hand, the TOC concentration at the outlet of the first device example showing the results of Comparative Example 1 was 0.4 - 0.8 ppb, which was more unstable and had a lower removal rate than Example 1 under the same irradiation dose conditions. It can be seen that in the second device example showing the results of Comparative Example 2, when the TOC concentration of the treated water (raw water) is high, the organic components cannot be completely treated. Regarding the removal rate of TOC from EDI11 to the treated water drained from CP14-2 or CP14, it was 50% or less in Comparative Examples 1 and 2, whereas a result of 80% or more was obtained in Example 1.

[0031] In the system described in Patent Document 1, the main ultrapure water production system and the sub ultrapure water production system are equivalent, and the sub ultrapure water production system is configured to produce ultrapure water of the same quality as the ultrapure water produced by the main ultrapure water production system. This results in a large system size. Furthermore, because of this equivalent configuration, the residence time in the sub ultrapure water production system cannot be significantly shorter than the residence time in the main ultrapure water production system. As a result, it is not possible to respond to sudden changes in the quality of the raw water, which makes it difficult to manage the operation and management of the ultrapure water production system.

[0032] Furthermore, in the evaluation systems described in Patent Documents 2 and 3, the ultraviolet oxidation device and the ion exchange device are connected in a single stage. Therefore, even if the raw water contains organic matter that can be removed by the main pure water production system, the evaluation system may leave organic matter in the treated water. The ultraviolet oxidation device irradiates the water to be treated with ultraviolet light to oxidize the organic matter into organic acids, which are then removed by the downstream ion exchange device. During this process, the organic acids produced in the ultraviolet oxidation device block (absorb) the ultraviolet light. In other words, the organic acids create areas that are not exposed to UV light. Therefore, even if the UV irradiation dose in the ultraviolet oxidation device is increased, the organic acids produced increase, and the ultraviolet oxidation device is unable to sufficiently remove organic matter from the water to be treated. As a result, the organic matter (TOC) concentration increases in the evaluation system, making it difficult to accurately detect the inflow of persistent substances into the main pure water production system.

[0033] On the other hand, in this embodiment, multiple equipment sets, each with a UV and a CP, are arranged in series. The CP removes organic acids generated by UV irradiation of the water to be treated with UV light in the first equipment set, and the UV in the second equipment set then irradiates UV light onto the water to be treated from which organic acids that interfere with UV irradiation have been removed. This allows the UV in the second equipment set to remove organic components that were not completely removed in the first equipment set. This allows water to be obtained for appropriate water quality management. Furthermore, no other water treatment devices (e.g., tank 308 shown in FIG. 1) are placed between the equipment sets, and the equipment sets are connected only by piping. This shortens the retention time from the supply of water to be treated to the discharge of ultrapure water. In reality, it takes more than 10 hours from the supply of water to be treated to the discharge of ultrapure water in the water production system 3, but this can be reduced to about one hour in the water treatment device 100. Therefore, if the water treatment device 100 is used as a device for monitoring the quality of raw water or ultrapure water, the value of the quality of ultrapure water produced by the water production system 3 using raw water can be obtained quickly. (Second embodiment)

[0034] FIG. 6 is a diagram showing a second embodiment of a water treatment device of the present invention. The water treatment device 101 shown in FIG. 6 is arranged in the position of the water treatment device 100 shown in FIG. 1. In the water treatment device 101 of this embodiment, as shown in FIG. 6, the MD 12 provided in the water treatment device 100 shown in FIG. 2 is arranged between the CP 14-1 of the device set 110-1 and the UV 13-2 of the device set 110-2. In other words, the device set 110-1 and the device set 110-2 are connected only via the MD 12 and piping. The MD 12 may be arranged both in the position shown in FIG. 6 and in the position shown in FIG. 6. Furthermore, if another device set is connected downstream of the device set 110-2, a degassing membrane device may also be arranged between the device set and the device set 110-2. In other words, in this embodiment, the device set and the device set downstream of the device set are connected only via piping or via piping and the MD 12.

[0035] The device disposed between an equipment set and an equipment set disposed downstream of the equipment set (hereinafter referred to as the inter-set device) is not limited to a degassing membrane device as in the second embodiment. The inter-set device may be any device in which the residence time of the inflowing treated water from the time of treatment to the time of discharge is within a specified time. The specified time may be a time in which the time from when the water to be treated is supplied to the water treatment device of the present invention until the ultrapure water is discharged is sufficiently short compared to the time from when the water to be treated is supplied to the water production system 3 shown in FIG. 1 until the ultrapure water is discharged. For example, the specified time is 15 minutes, preferably 6 minutes, and more preferably 3 minutes. Examples of the inter-set device include a degassing membrane device, as well as a filtration membrane device, a filter, a pump, a valve, etc. As long as the specified time is met, the inter-set device may be a combination of multiple devices. On the other hand, a tank (water tank) for storing the water to be treated or the treated water is not preferable as the inter-set device. In this way, by providing an inter-set device that processes in a sufficiently short time compared to the water production system 3 shown in Figure 1, the water quality value of the ultrapure water produced by the water production system 3 can be obtained quickly.

[0036] FIG. 7 is a diagram showing one embodiment of a water treatment device 102 in which an inter-set device is disposed between two device sets. The components of the water treatment device 102 shown in FIG. 7, except for the inter-set device 15, are the same as the components of the water treatment device 101 in the second embodiment. The inter-set device 15 is disposed between the device set 110-1 and the device set 110-2. In a configuration in which the inter-set device 15 is not disposed, i.e., in a configuration in which the device set 110-1 and the device set 110-2 are connected only via piping, the time from when the water to be treated is supplied to the water treatment device 102 to when it is discharged is 45 minutes. Therefore, as described above, in order to keep the residence time from when the water to be treated is supplied to the water treatment device 102 to when it is discharged within one hour, it is necessary to dispose an inter-set device 15 in such a way that the residence time from when the water to be treated flows into the inter-set device 15 to when it is treated and then discharged from the inter-set device 15 is within 15 minutes. For example, if an inter-set device 15 with a residence time of 10 minutes is installed, the residence time from when the water to be treated is supplied to the water treatment device 102 until it is discharged will be less than one hour (45 minutes + 10 minutes = 55 minutes). On the other hand, if an inter-set device 15 is installed such that the residence time from when the water to be treated that flows into the inter-set device 15 is treated and then discharged from the inter-set device 15 exceeds 15 minutes, the residence time from when the water to be treated is supplied to the water treatment device 102 until it is discharged will exceed one hour, and the above-mentioned condition (within one hour) cannot be met. For example, if an inter-set device 15 with a residence time of 30 minutes is installed, the residence time will be (45 minutes + 30 minutes = 75 minutes), and the residence time from when the water to be treated is supplied to the water treatment device 102 until it is discharged will exceed one hour. In addition, the condition (target value) for the residence time of the water treatment device 102, such as the above-mentioned 1 hour, may be set based on the actual measured value of the time from when the water to be treated is supplied to the water treatment device 102 to when it is discharged in a configuration in which the inter-set device 15 is not installed, or the actual measured value of the time from when the water to be treated is supplied to the water production system 3 to when the ultrapure water is discharged.

[0037] As described above, the water treatment device 100 shown in Fig. 2 and the water treatment device 101 shown in Fig. 6 are devices that can predict (manage) the water quality of treated water passed through the water production system 3 arranged in parallel. Therefore, the configuration of the water treatment device 100 shown in Fig. 2 or the configuration of the water treatment device 101 shown in Fig. 6 can also be used as a so-called primary pure water production device or secondary pure water production device. [Explanation of symbols]

[0038] 1,20,20-1~20-4,30 Valve 2. Aquarium 3. Water production system 10,304 RO 11 EDI 12,312 MD 13,13-1~13-4,305,310 UV 14,14-1,14-2,311 CP 15 sets of equipment 40 TOC total 50 control section 100~102 Water treatment equipment 110-1, 110-2 equipment set 301 Sand filter equipment 302 AC 303,309 HEX 306 IER 307 DG 308 Tank 313 UF

Claims

1. The system has a plurality of sets of ultraviolet irradiation devices and ion exchange resin charging devices that perform predetermined treatment on supplied water to be treated, the sets being connected in series in the order of the ultraviolet irradiation device and the ion exchange resin charging device, A water treatment device in which the plurality of device sets are connected in series to each other only through piping or only through devices and piping with a residence time of 15 minutes or less.

2. The water treatment device according to claim 1, The water treatment device in which the residence time is 15 minutes or less is a degassing membrane device, a filtration membrane device, a filter, a pump, or a valve.

3. The water treatment device according to claim 1 or 2, A water treatment device comprising a degassing membrane device disposed in front of the device set disposed in the forefront stage of the plurality of device sets.

4. The water treatment device according to claim 1 or 2, A water treatment device having a measuring device for measuring the quality of the outlet water of at least one of the plurality of device sets.

5. The water treatment device according to claim 4, A water treatment device having a control unit that controls the operation of a water production system to which the water to be treated is supplied, based on the measurement values ​​measured by the measuring device.

6. The water treatment device according to claim 1 or 2, The water treatment device wherein the number of device sets is two.

7. In a water treatment device, a plurality of equipment sets, each of which is connected in series in the order of ultraviolet irradiation equipment and ion exchange resin charging equipment, each of which performs a predetermined treatment on supplied water to be treated, are connected to each other only through piping or equipment and piping having a residence time of 15 minutes or less, and the water to be treated is supplied to the equipment set located at the front stage; and measuring the quality of the outlet water of at least one of the plurality of device sets.

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