Water treatment system and water treatment method

Abstract

A water treatment system is provided with: a water treatment facility which is provided with a plurality of water treatment devices and treats water to be treated; a water treatment management device (10) to which water to be treated to be supplied to any one of the plurality of water treatment devices is supplied; and a control device (30) for controlling the operating conditions of the water treatment device, the water treatment management device (10) being provided with: a TOC measurement unit (16) for measuring the TOC concentration of water passing through the water passing line of the water treatment management device (10); and a specific organic matter measurement unit (17) for measuring the concentration of a specific organic matter in the water passing through the water passing line of the water treatment management device, and the control device (30) controls the operating conditions of the water treatment device on the basis of the TOC concentration measured by the TOC measurement unit (16) and the specific organic matter concentration measured by the specific organic matter measurement unit (17).

Description

Technical Field

[0001] The invention relates to a water treatment system and a water treatment method. Background Art

[0002] In water treatment systems such as ultrapure water production systems that generate ultrapure water from raw water, it is also necessary to pay attention to the water quality of the raw water supplied to the water treatment system. For example, in ultrapure water production systems, reverse osmosis membrane (RO) treatment and ultraviolet (UV) oxidation treatment are performed to remove organic substances (TOC: Total Organic Carbon) contained in raw water. However, among the organic substances that are to be removed, there are components that are easily removed by these treatments and components that are not. As raw water supplied to ultrapure water production systems, tap water, tap water, industrial water, etc. have been used so far. In recent years, in order to achieve effective use of water resources, recycled water that is treated and reused from sewage generated in life and recycled water that is treated and reused from factory wastewater are used as raw water. The water quality of these recycled water and recycled water tends to become unstable compared to the water quality of industrial water. In addition, unexpected organic matter is sometimes suddenly contained in recycled water and recycled water. If organic matter that is difficult to remove is mixed in the raw water, it may affect the quality of the treated water supplied from the outlet of the ultrapure water production system. Therefore, it is more important to monitor the quality of the raw water in the ultrapure water production system and appropriately manage the operation of the ultrapure water production system according to the water quality.

[0003] As the high demand for pure water quality emerges, various methods for decomposing and removing trace organic matter contained in pure water are being studied in recent years. As a representative of such methods, a method of using a decomposition and removal process of organic matter using ultraviolet oxidation treatment can be cited. Among them, a technology is considered to promote the oxidation of TOC in the treated water by adding a sulfur compound containing a peroxide group to the treated water and then irradiating it with ultraviolet light. Patent document 1 records a technology for controlling the irradiation amount of the ultraviolet irradiation device of the main system based on the TOC value of the treated water of the secondary ultrapure water manufacturing system set up separately from the main system. In addition, patent document 2 records a technology for adding sulfur compounds to the treated water for ultraviolet treatment.

[0004] Prior art literature Patent Literature Patent Document 1: Japanese Patent Application Publication No. 2016-107249 Patent Document 2: Japanese Patent Application Publication No. 2008-229417 Summary of the invention Problems to be solved by the invention In the technology described in Patent Document 1, it is presumed that the ultraviolet oxidation device of the main system is a low-pressure UV oxidation device. This method is effective when only the TOC component that is easily removed by low-pressure UV is detected. The treated water of the secondary ultrapure water production system may contain difficult-to-decompose TOC that is difficult to remove by RO or low-pressure UV oxidation device. At this time, if the UV irradiation amount of the main system is controlled based on the TOC value of the treated water of the secondary ultrapure water production system, it is believed that the irradiation amount will become an inappropriate (for example, excessive) amount. In addition, TOC components (such as urea, etc.) that are difficult to remove by low-pressure UV even if over-irradiated will leak into the treated water. Therefore, the water quality is reduced. In addition, there is no record of controlling the irradiation amount and persulfuric acid concentration in Patent Document 2. In the method described in Patent Document 2, when there is a change in TOC in the treated water, the irradiation amount and the addition amount relative to TOC are excessive or insufficient, making it difficult to perform stable treatment. In addition, the excessive irradiation amount and the addition amount lead to increased power consumption, so the operating cost becomes high.

[0005] Thus, in the above-mentioned technology, there is a problem that TOC cannot be removed stably and efficiently.

[0006] An object of the present invention is to provide a water treatment system and a water treatment method capable of removing TOC stably and efficiently.

[0007] Technical solutions to solve problems The water treatment system of the present invention has: Water treatment equipment, which has multiple water treatment devices to treat the water to be treated; a water treatment management device supplied with the water to be treated to be supplied to any one of the plurality of water treatment devices; and a control device for controlling the operating conditions of the water treatment device, The water treatment management device comprises: a first measuring unit that measures the TOC concentration of water passing through a water pipe to the water treatment management device; and a second measuring unit for measuring the concentration of specific organic matter in water passing through the water pipe of the water treatment management device; The control device controls the operating conditions of the water treatment device based on the TOC concentration measured by the first measuring unit and the specific organic matter concentration measured by the second measuring unit.

[0008] In addition, the water treatment system of the present invention has: Water treatment equipment, which has multiple water treatment devices to treat the water to be treated; a water treatment management device supplied with the water to be treated to be supplied to any one of the plurality of water treatment devices; an oxidant adding unit, which adds an oxidant to the treated water; and a control device for controlling the operating conditions of the water treatment device, The water treatment management device includes a measuring unit for measuring the TOC concentration of water flowing through a water flow line of the water treatment management device. The control device controls at least one of the amount of oxidant added by the oxidant addition unit and the amount of irradiation of the ultraviolet irradiation device among the plurality of water treatment devices on the water to be treated to which the oxidant is added by the oxidant addition unit based on the TOC concentration measured by the measuring unit.

[0009] In addition, the water treatment method of the present invention comprises the following steps: measuring the TOC concentration of water flowing through a water pipe passing through a water treatment management device, wherein the water treatment management device is supplied with the treated water to be supplied to any one of the plurality of water treatment devices of a water treatment facility that treats the treated water using the plurality of water treatment devices; Determining the concentration of specific organic matter in water passing through a water pipeline to the water treatment management device; and Based on the measured TOC concentration and the measured specific organic matter concentration, operating conditions of the water treatment device are controlled.

[0010] Effects of the Invention In the present invention, TOC can be removed stably and efficiently. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a diagram showing a first embodiment of the water treatment system of the present invention.

[0012] Figure 2 It is used to illustrate Figure 1 A flowchart of an example of processing in the control device shown.

[0013] Figure 3 It is a diagram showing a second embodiment of the water treatment system of the present invention.

[0014] Figure 4 It is used to illustrate Figure 3 A flowchart of an example of processing in the control device shown.

[0015] Figure 5 It is a diagram showing a third embodiment of the water treatment system of the present invention.

[0016] Figure 6 It is used to illustrate Figure 5 A flowchart of an example of processing in the control device shown.

[0017] Figure 7 It is a diagram showing a fourth embodiment of the water treatment system of the present invention.

[0018] Figure 8 It is used to illustrate Figure 7 A flowchart of an example of processing in the control device shown.

[0019] Fig. 9 It is a diagram showing a fifth embodiment of the water treatment system of the present invention.

[0020] Fig.10 It is used to illustrate Fig. 9 A flowchart of an example of processing in the control device shown.

[0021] Fig.11 It is a diagram showing a sixth embodiment of the water treatment system of the present invention.

[0022] Fig.12 It is used to illustrate Fig.11 A flowchart of an example of processing in the control device shown.

[0023] Fig.13 It is a diagram showing the structure of Example 1-1 of the water treatment system used in the present invention.

[0024] Fig.14 It is a diagram showing the structure of Comparative Example 1-1 for comparison with Example 1-1.

[0025] Fig.15 It is a diagram showing the structure of Example 1-2 of the water treatment system used in the present invention.

[0026] Fig.16 It is a diagram showing the structure of Comparative Example 1-2 for comparison with Example 1-2.

[0027] Fig.17 It is a diagram showing the structure of Example 2-1 of the water treatment system used in the present invention.

[0028] Fig.18 It is a diagram showing the structure of Example 2-2 of the water treatment system used in the present invention.

[0029] Fig.19 It is a diagram showing the structure of Example 3-1 of the water treatment system used in the present invention.

[0030] Fig. 20 It is a diagram showing the structure of Example 3-2 of the water treatment system used in the present invention.

[0031] Fig.21It is a diagram showing the structure of Example 4-1 of the water treatment system used in the present invention.

[0032] Fig. 22 It is a diagram showing the structure of Example 4-2 of the water treatment system used in the present invention. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0034] (First embodiment) Figure 1 1 is a diagram showing a first embodiment of the water treatment system of the present invention. Figure 1 As shown, the water treatment system in this embodiment has a water treatment device 231, and the water treatment device 231 includes a water treatment device 20 with a function of removing urea, UV21 as an ultraviolet irradiation device, and a water treatment device 22. The water treatment device 20 and the water treatment device 22 are composed of one or more combinations of devices (unit devices) for treating the target liquid, such as a filtration device, activated carbon, a deionization device, a reverse osmosis membrane device, a degassing device, and an ultraviolet irradiation device. For example, the water treatment device 20 includes a filtration device, activated carbon, a deionization device, and a reverse osmosis membrane device, and the water treatment device 22 includes a deionization device, a degassing device, and a membrane treatment device. Raw water as the water to be treated is supplied to the water treatment device 231 (specifically, the water treatment device 20). The supplied raw water is processed in the order of the water treatment device 20, UV21, and the water treatment device 22. In this way, water of a given water quality (such as pure water, etc.) is produced. The produced water is supplied from the water treatment device 22 to the use point, other water treatment equipment, etc. Figure 1 In the example shown, a plurality of water treatment devices constituting the water treatment equipment 231 are arranged in series along the water pipeline for the treated water. A part or all of the plurality of water treatment devices may also be arranged in parallel with each other. This is also the same for the other embodiments described below. The water treatment system in this embodiment has a water treatment management device 10 to which at least a part of the treated water to be supplied to the water treatment equipment 231 is supplied. The water treatment management device 10 has AC11 as activated carbon, RO12 as a reverse osmosis membrane device, EDI13 as an electric regeneration pure water device, UV14 as an ultraviolet irradiation device, CP15 as an ion exchange resin filling device, a TOC measuring unit 16, and a specific organic matter measuring unit 17. In this embodiment, AC11, RO12, EDI13, UV14, and CP15 are arranged in series along the water pipeline for the treated water. At least a part of the treated water supplied to the water treatment equipment 231 is sequentially passed to AC11, RO12, EDI13, UV14, and CP15. Furthermore, the water treatment system in this embodiment includes a control device 30 .

[0035] The water treatment management device 10 is provided with a Figure 1 The AC11, RO12, UV14, ion exchange resin filling device and other water treatment devices shown are used for unit operation of removing TOC components. The water treatment management device 10 does not need to be equivalent to the structure of the main water treatment equipment 231. In order to speed up the time of detecting TOC contained in the treated water, the water treatment management device 10 is preferably not equivalent to the main water treatment equipment 231, but has a simple structure. Figure 1 As shown, the ion exchange resin filling device can be EDI13. In addition, CP15 can be EDI13. There is no restriction on the order of passing water to the water treatment device arranged in the water treatment management device 10. Considering the treatment efficiency of UV and the life of the ion exchange resin, the water passing order is preferably set to the order of activated carbon, RO, EDI, UV, and ion exchange resin filling device. In the water treatment management device 10, in order to improve the treatment performance, a degassing device such as a degassing membrane can also be provided. In addition, AC11, RO12, EDI13, UV14 and CP15 can also be multi-stage. This is also the same for the second to sixth embodiments described below.

[0036] The TOC measuring unit 16 is a first measuring unit (TOC meter) for measuring the TOC concentration of water passing through the water pipe line of the water treatment management device 10. The TOC measuring unit 16 outputs the measured TOC concentration value to the control device 30. In addition, the TOC measuring unit 16 can measure not only the TOC concentration of water passing through the CP 15, but also the TOC concentration of water treated by other water treatment devices.

[0037] The specific organic matter measuring unit 17 is a second measuring unit that measures the organic matter concentration using an index other than TOC measured by the TOC measuring unit 16. The measuring point at which the specific organic matter measuring unit 17 measures the organic matter concentration may be the same point as the point at which the TOC measuring unit 16 measures the TOC concentration, or may be a different point. For example, the TOC measuring unit 16 is not limited to CP15, and in the case of measuring the TOC concentration of water treated by any water treatment device installed in the water treatment management device 10, the specific organic matter measuring unit 17 may also use an index other than TOC to measure the organic matter concentration of the water treated by the water treatment device. Alternatively, for example, in the case where the TOC measuring unit 16 measures the TOC concentration at a measuring point in the preceding stage of RO12, the specific organic matter measuring unit 17 may also take into account the specific organic matter rejection rate in RO12 to infer the specific organic matter concentration of the treated water of CP15. Alternatively, for example, when the TOC measuring unit 16 measures the TOC concentration of the treated water of CP15, and the specific organic matter measuring unit 17 measures the specific organic matter concentration at the measuring point of the front stage of AC11 or the front stage of RO12, the specific organic matter measuring unit 17 may also estimate the specific organic matter concentration of the treated water of CP15 by considering the specific organic matter rejection rate in RO12. The specific organic matter measuring unit 17 may be, for example, a urea meter that measures the concentration of urea. The specific organic matter measuring unit 17 outputs the value of the measured organic matter concentration to the control device 30. In addition, when the specific organic matter measuring unit 17 estimates the specific organic matter concentration of the treated water of CP15, it outputs the estimated value as the measured value to the control device 30.

[0038] The control device 30 controls the operating conditions of the water treatment device constituting the water treatment equipment 231 based on the value of the TOC concentration (TOC value) output from the TOC measuring unit 16 and the value of the specific organic matter concentration output from the specific organic matter measuring unit 17. In this embodiment, the control device 30 controls the ultraviolet irradiation amount irradiated by UV21. Here, the ultraviolet irradiation amount controlled by the control device 30 is the irradiation power per unit flow rate. For example, the control device 30 converts (converts) the value of the specific organic matter concentration output from the specific organic matter measuring unit 17 into a TOC value. This conversion is performed using the ratio of the atomic weight of carbon in the organic matter molecule to the molecular weight of the organic matter (for example, urea). The control device 30 can also calculate the ultraviolet irradiation amount irradiated by UV21 based on the difference or ratio (the ratio of the second TOC value to the first TOC value. The same applies hereinafter) between the TOC value (first TOC value) output from the TOC measuring unit 16 and the TOC value (second TOC value) converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. When calculating the ultraviolet irradiation amount, the control device 30 may also use a given calculation formula or correspondence relationship for calculating the ultraviolet irradiation amount based on the difference or ratio between the first TOC value and the second TOC value. In addition, when calculating the ultraviolet irradiation amount, the control device 30 may also use a comparison of a threshold value (which may be one or more) calculated in advance based on the difference or ratio between the first TOC value and the second TOC value and the water quality (e.g., TOC value, dissolved oxygen concentration) of the water supplied from the water treatment device 22 to the use point at this time. As the ultraviolet irradiation amount, the control device 30 controls at least one of the number of lamps lit, the processing flow rate, and the lamp dimming of UV21. In addition, the control device 30 may also control the ultraviolet irradiation amount irradiated by the UV provided by the water treatment device 20 or the water treatment device 22. In addition, the control device 30 may also start or stop the operation of UV21 based on the difference or ratio between the first TOC value and the second TOC value. For example, when the difference is less than a threshold value, the control device 30 may stop the operation of UV21, and when the difference is greater than the threshold value, the control device 30 may start the operation of UV21. In addition, a reverse osmosis membrane device may be provided in the water treatment device constituting the water treatment equipment 231, and the control device 30 may control the recovery rate, water temperature, etc. of the reverse osmosis membrane device based on the value of the TOC concentration (TOC value) output from the TOC measuring unit 16 and the value of the organic matter concentration output from the specific organic matter measuring unit 17.

[0039] The following, Figure 1 The processing in the control device 30 shown will be described. Figure 2 It is used to illustrate Figure 1 1 is a flowchart of an example of processing in the control device 30 shown in FIG. Here, a case where the specific organic matter measuring unit 17 measures the concentration of urea will be described as an example.

[0040] First, the control device 30 obtains the TOC value measured by the TOC measuring unit 16 (step S1). In addition, the control device 30 obtains the value of the urea concentration measured by the specific organic matter measuring unit 17 (step S2). The control device 30 converts the obtained urea concentration value into a TOC value. The control device 30 calculates the ultraviolet irradiation amount based on the obtained TOC value and the TOC value converted from the urea concentration (step S3). Then, the control device 30 controls the UV 21 to irradiate the calculated ultraviolet irradiation amount (step S4).

[0041] Thus, in this method, a water treatment management device 10 is provided to which at least a portion of the treated water to be supplied to the water treatment equipment 231 is passed (supplied), and a measuring device measures the TOC value and specific organic matter concentration of the water in the water pipe passing through the water treatment management device 10. The control device 30 controls the ultraviolet irradiation amount of the ultraviolet irradiation device provided in the water treatment equipment 231 based on the measured TOC value and specific organic matter concentration. As specific organic matter, for example, urea which is difficult to remove by a reverse osmosis membrane device or an ultraviolet irradiation device can be cited. Urea is generally treated by using bromide and hypochlorous acid, but the treatment time is relatively long, and it is difficult to set up a urea treatment device in the water treatment management device. Therefore, based on the measured value of urea which is difficult to remove by the water treatment management device, the irradiation amount of ultraviolet rays irradiated by the ultraviolet irradiation device is controlled, so that TOC can be removed efficiently.

[0042] (Second embodiment) Figure 3 2 is a diagram showing a second embodiment of the water treatment system of the present invention. Figure 3 As shown, the water treatment system in this embodiment has a water treatment device 232, and the water treatment device 232 includes a water treatment device 20, MD23 as a degassing device, UV21 as an ultraviolet irradiation device, and a water treatment device 22. Raw water as treated water is supplied to the water treatment device 232 (specifically, the water treatment device 20). The supplied raw water is sequentially treated in the order of the water treatment device 20, MD23, ​​UV21, and the water treatment device 22. Thus, water of a given water quality (such as pure water, etc.) is produced. The produced water is supplied from the water treatment device 22 to a point of use, other water treatment equipment, etc. In addition, the water treatment system in this embodiment has a water treatment management device 10 to which at least a part of the treated water to be supplied to the water treatment device 232 is supplied. The water treatment management device 10 is the same as the water treatment management device in the first embodiment. Moreover, the water treatment system in this embodiment has a control device 31.

[0043] The control device 31 controls the operating conditions of the water treatment device constituting the water treatment device 232 based on the value of the TOC concentration (TOC value) output from the TOC measuring unit 16 and the value of the specific organic matter concentration output from the specific organic matter measuring unit 17. In this embodiment, the control device 31 controls the dissolved oxygen concentration of the treated water of MD23 and UV21. Based on the value measured by the water treatment management device 10, the control device 31 can set the dissolved oxygen concentration of the treated water of UV21 of the water treatment device 232, and control the dissolved oxygen concentration so that the value of the dissolved oxygen meter of the water treatment device 232 becomes the set value. For example, a dissolved oxygen meter can be set between MD23 and UV21. As MD23, ​​for example, a vacuum degassing device, a membrane degassing device, and a nitrogen degassing device can be cited. As other degassing devices, a degassing device that removes oxygen by reacting oxygen with hydrogen using a Pd catalyst on the basis of adding hydrogen to form water can be used. In the case of using a vacuum degassing device as MD23, ​​the control device 31 uses a vacuum pump or the like to adjust the vacuum degree to control the dissolved oxygen concentration. At this time, the control device 31 can use an inverter for control. For example, the control device 31 converts (converts) the value of the organic matter concentration output from the specific organic matter measuring unit 17 into a TOC value. The conversion is performed using the ratio of the atomic weight of carbon in the organic matter molecule to the molecular weight of the organic matter (for example, urea). The control device 31 can also calculate the dissolved oxygen concentration of the treated water of UV21 controlled by MD23 based on the difference and ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. When calculating the dissolved oxygen concentration, the control device 31 can also use a given calculation formula and correspondence relationship for calculating the dissolved oxygen concentration based on the difference and ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. When calculating the dissolved oxygen concentration, the control device 31 may also use a comparison of a threshold value (which may be one or more) calculated in advance based on the water quality (e.g., TOC value, dissolved oxygen concentration) of the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17, and the water quality (e.g., TOC value, dissolved oxygen concentration) of the water supplied from the water treatment device 22 to the use point at this time. In addition, the control device 31 may start or stop the operation of MD23 based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. For example, when the difference is a value smaller than the threshold value (which may be one or more), the control device 31 may stop the operation of MD23, ​​and when the difference is greater than the threshold value, the control device 31 may start the operation of MD23.In addition, the control device 31 can also calculate the ultraviolet irradiation amount irradiated by UV21 and the dissolved oxygen concentration of the water to be treated by UV21 based on the difference and ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. In this case, the control device 31 controls in a manner that UV21 irradiates ultraviolet rays of the calculated ultraviolet irradiation amount, and controls MD23 in a manner that the dissolved oxygen concentration of the treated water becomes the calculated dissolved oxygen concentration. In addition, the control device 31 can also be controlled in the following manner: the irradiation of the calculated ultraviolet irradiation amount or the calculated dissolved oxygen concentration is obtained by combining the action of UV21 and the action of MD23. In addition, as to which of the irradiation of the ultraviolet irradiation amount and the dissolved oxygen concentration the control device 31 controls first, in addition to the treatment performance, it can also be determined by considering the operating cost and the load on the water treatment device configured in the later stage.

[0044] The following, Figure 3 The processing in the control device 31 shown will be described. Figure 4 It is used to illustrate Figure 3 Flowchart of an example of processing in the control device 31 shown in FIG. Here, a case where the specific organic matter measuring unit 17 measures the concentration of urea will be described as an example.

[0045] First, the control device 31 obtains the TOC value measured by the TOC measuring unit 16 (step S11). In addition, the control device 31 obtains the value of the urea concentration measured by the specific organic matter measuring unit 17 (step S12). The control device 31 converts the obtained urea concentration value into a TOC value. The control device 31 calculates the dissolved oxygen concentration based on the obtained TOC value and the TOC value converted from the urea concentration (step S13). Then, the control device 31 controls the MD23 so that the dissolved oxygen concentration of the treated water becomes the calculated dissolved oxygen concentration (step S14).

[0046] Thus, in this embodiment, a water treatment management device 10 is provided through which at least a portion of the water to be treated is passed (supplied) to be supplied to the water treatment equipment 232, and a measuring device measures the TOC value and specific organic matter concentration of the water passing through the water pipe of the water treatment management device 10. The control device 31 controls the degassing device provided in the water treatment equipment 232 based on the measured TOC value and specific organic matter concentration. By controlling the dissolved oxygen concentration based on the measured value taking into account urea which is difficult to remove in the water treatment management device, TOC can be removed efficiently.

[0047] (Third Embodiment) Figure 5 2 is a diagram showing a third embodiment of the water treatment system of the present invention. Figure 5As shown, the water treatment system in this embodiment has a water treatment device 233, which includes a water treatment device 20, UV21 as an ultraviolet irradiation device, and a water treatment device 22. Raw water as treated water is supplied to the water treatment device 233 (specifically, the water treatment device 20). The supplied raw water is sequentially treated in the order of the water treatment device 20, UV21, and the water treatment device 22. Thus, water of a given water quality (for example, pure water, etc.) is produced. The produced water is supplied from the water treatment device 22 to a point of use, other water treatment devices, etc. In addition, the water treatment system in this embodiment has a water treatment management device 10 to which at least a part of the treated water to be supplied to the water treatment device 233 is supplied. The water treatment management device 10 is the same as the water treatment management device in the first embodiment. Moreover, the water treatment system in this embodiment has a control device 32 and a sulfur compound adding unit 24 as an oxidant adding unit. The sulfur compound adding unit 24 may also be included in the water treatment device 233.

[0048] The sulfur compound adding section 24 adds an oxidant to the treated water passing through UV21 based on the control of the control device 32. The oxidant added by the sulfur compound adding section 24 can be a general oxidant such as hydrogen peroxide, halogen oxygen acid, permanganate, and a sulfur compound containing a peroxide group. From the perspective of removal performance, the oxidant added by the sulfur compound adding section 24 is preferably a sulfur compound containing a peroxide group. As a sulfur compound containing a peroxide group, for example, ammonium peroxydisulfate, sodium peroxydisulfate, potassium peroxydisulfate, etc. can be cited. These sulfur compounds can be used alone or in combination. In addition, UV21 in this embodiment is a medium-pressure ultraviolet irradiation device with an internal pressure in a given pressure range (above the first pressure and less than the second pressure) or a high-pressure ultraviolet irradiation device with an internal pressure of more than a given pressure (second pressure). UV21 irradiates ultraviolet light to the treated water to which the oxidant is added from the sulfur compound adding section 24. UV21 can also be a low-pressure ultraviolet irradiation device with an internal pressure less than a given pressure (first pressure). As UV21, from the aspect of being able to make the device compact, it is preferable to use a medium-pressure ultraviolet irradiation device or a high-pressure ultraviolet irradiation device with high irradiation power per ultraviolet lamp. In addition, a reduction unit may be provided at the rear stage of UV21.

[0049] The control device 32 controls the operating conditions of the water treatment device constituting the water treatment equipment 233 based on the value of the TOC concentration (TOC value) output from the TOC measuring unit 16 and the value of the specific organic matter concentration output from the specific organic matter measuring unit 17. In this embodiment, the control device 32 controls the amount of the oxidant added by the sulfur compound adding unit 24. Thus, the control device 32 can control the oxidant concentration of the water to be treated by UV21 (the same applies to the following description). For example, the control device 32 converts (converts) the value of the organic matter concentration output from the specific organic matter measuring unit 17 into a TOC value. This conversion is performed using the ratio of the atomic weight of carbon in the organic matter molecule to the molecular weight of the organic matter (for example, urea). The control device 32 can also calculate the amount of the oxidant added from the sulfur compound adding unit 24 based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. When calculating the amount of the oxidant to be added, the control device 32 may use a given calculation formula or a correspondence relationship for calculating the amount of the oxidant to be added based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. When calculating the amount of the oxidant to be added, the control device 32 may use a comparison between the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17 and the threshold value (which may be one or more) calculated in advance based on the water quality (for example, TOC value, dissolved oxygen concentration) of the water supplied from the water treatment device 22 to the point of use at that time. In addition, the control device 32 may calculate the amount of ultraviolet radiation irradiated by the UV 21 and the amount of the oxidant to be added by the sulfur compound adding unit 24 based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. In this case, the control device 32 controls the UV21 to irradiate the ultraviolet rays of the calculated ultraviolet irradiation amount, and controls the sulfur compound adding unit 24 to add the oxidant of the calculated concentration. In addition, the control device 32 may start or stop the operation of the UV21 and the addition of the oxidant from the sulfur compound adding unit 24 based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. For example, when the difference is less than a threshold value, the control device 32 may stop the operation of the UV21 and the addition of the oxidant from the sulfur compound adding unit 24, and when the difference is greater than the threshold value, the control device 32 may start the operation of the UV21 and the addition of the oxidant from the sulfur compound adding unit 24.

[0050] The following, Figure 5 The processing in the control device 32 shown will be described. Figure 6 It is used to illustrate Figure 5 1 is a flowchart of an example of processing in the control device 32. Here, a case where the specific organic matter measuring unit 17 measures the concentration of urea will be described as an example.

[0051] First, the control device 32 obtains the TOC value measured by the TOC measuring unit 16 (step S21). In addition, the control device 32 obtains the value of the urea concentration measured by the specific organic matter measuring unit 17 (step S22). The control device 32 converts the obtained value of the urea concentration into a TOC value. The control device 32 calculates the amount of the oxidant added by the sulfur compound adding unit 24 based on the obtained TOC value and the TOC value converted from the urea concentration (step S23). Then, the control device 32 controls the sulfur compound adding unit 24 to add the oxidant of the calculated concentration (step S24).

[0052] Thus, in this method, a water treatment management device 10 is provided to which at least a portion of the treated water to be supplied to the water treatment equipment 233 is passed (supplied), and a measuring device measures the TOC value and specific organic matter concentration of the water in the water pipe passing through the water treatment management device 10. The control device 32 controls the amount of oxidant added to the treated water passed through the ultraviolet irradiation device provided in the water treatment equipment 233 based on the measured TOC value and specific organic matter concentration. By controlling the amount of oxidant added or the amount of ultraviolet irradiation based on the measured value of urea that is difficult to remove in the water treatment management device 10, TOC can be removed stably and efficiently. In addition, by providing an oxidant addition unit in the front stage of the ultraviolet irradiation device provided in the water treatment equipment 233 to treat TOC, the effect of improving TOC removal performance can be obtained. In addition, whether the control device 32 prioritizes controlling the amount of oxidant added to the treated water or the amount of ultraviolet light irradiated by the ultraviolet irradiation device can be determined by considering not only the treatment performance but also the operating cost and the load on the water treatment device configured at the subsequent stage.

[0053] (Fourth Embodiment) Figure 7 2 is a diagram showing a fourth embodiment of the water treatment system of the present invention. Figure 7As shown, the water treatment system in this embodiment has a water treatment device 234, which includes a water treatment device 20, UV21 as an ultraviolet irradiation device, a water treatment device 22, a low-pressure UV25 as an ultraviolet irradiation device whose internal pressure is lower than a given pressure (first pressure), and a water treatment device 26. Raw water as treated water is supplied to the water treatment device 234 (specifically, the water treatment device 20). The supplied raw water is sequentially treated in the order of the water treatment device 20, UV21, the water treatment device 22, the low-pressure UV25, and the water treatment device 26. Thus, water of a given water quality (for example, pure water, etc.) is produced. The produced water is supplied from the water treatment device 26 to a point of use, other water treatment devices, etc. In addition, the water treatment system in this embodiment has a water treatment management device 10 to which at least a part of the treated water to be supplied to the water treatment device 234 is supplied. The water treatment management device 10 is the same as the water treatment management device in the first embodiment. The water treatment system in this embodiment includes a control device 33 and a sulfur compound adding unit 24 as an oxidant adding unit. The sulfur compound adding unit 24 is the same as that in the third embodiment. The sulfur compound adding unit 24 may be included in the water treatment equipment 234.

[0054] The control device 33 controls the operating conditions of the water treatment device constituting the water treatment equipment 234 based on the value of the TOC concentration (TOC value) output from the TOC measuring unit 16 and the value of the organic matter concentration output from the specific organic matter measuring unit 17. In this embodiment, the control device 33 controls at least one of the ultraviolet irradiation amount irradiated by the UV21, the ultraviolet irradiation amount irradiated by the low-pressure UV25, and the amount of the oxidant added by the sulfur compound adding unit 24. For example, the control device 33 converts (converts) the value of the specific organic matter concentration output from the specific organic matter measuring unit 17 into a TOC value. This conversion is performed using the ratio of the atomic weight of carbon in the organic matter molecule to the molecular weight of the organic matter (for example, urea). The control device 33 may calculate at least one of the ultraviolet irradiation amount irradiated by the UV 21, the ultraviolet irradiation amount irradiated by the low-pressure UV 25, and the amount of the oxidant added by the sulfur compound adding unit 24, based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. When calculating these irradiation amounts and concentrations, the control device 33 may use a given calculation formula or correspondence relationship for calculating the irradiation amount and concentration based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. In addition, the control device 33 may use a comparison of a threshold value (which may be one or more) calculated in advance based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17 and the water quality (for example, TOC value, dissolved oxygen concentration) of the water supplied from the water treatment device 22 to the point of use at that time when calculating these irradiation amounts and concentrations. In addition, the control device 33 may start or stop the operation of the UV 21 and the addition of the oxidant from the sulfur compound adding unit 24 based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. For example, when the difference is less than the threshold value, the control device 33 may stop the operation of the UV 21 and the addition of the oxidant from the sulfur compound adding unit 24, and when the difference is greater than the threshold value, the control device 33 may start the operation of the UV 21 and the addition of the oxidant from the sulfur compound adding unit 24.

[0055] The following, Figure 7 The processing in the control device 33 shown will be described. Figure 8 It is used to illustrate Figure 7Flowchart of an example of processing in the control device 33 shown in FIG. Here, a case where the specific organic matter measuring unit 17 measures the concentration of urea is described as an example. In addition, a case where the control device 33 controls the irradiation amount of ultraviolet rays irradiated by the low-pressure UV 25 is described as an example.

[0056] First, the control device 33 obtains the TOC value measured by the TOC measuring unit 16 (step S31). In addition, the control device 33 obtains the value of the urea concentration measured by the specific organic matter measuring unit 17 (step S32). The control device 33 converts the obtained value of the urea concentration into a TOC value. The control device 33 calculates the irradiation amount of ultraviolet rays irradiated by the low-pressure UV25 based on the obtained TOC value and the TOC value converted from the urea concentration (step S33). Then, the control device 33 controls the low-pressure UV25 so that the low-pressure UV25 irradiates the calculated irradiation amount of ultraviolet rays (step S34).

[0057] Thus, in the present method, a water treatment management device 10 is provided through which at least a portion of the treated water to be supplied to the water treatment equipment 234 is passed (supplied), and a measuring device measures the TOC value and specific organic matter concentration of the water in the water pipeline passing through the water treatment management device 10. The control device 33 controls at least one of the ultraviolet irradiation amount of the ultraviolet irradiation device provided in the water treatment equipment 234, the ultraviolet irradiation amount of the low-pressure ultraviolet irradiation device, and the amount of the oxidant added to the treated water passing through the ultraviolet irradiation device based on the measured TOC value and the specific organic matter concentration. By controlling the ultraviolet irradiation amount and the amount of the added oxidant based on the measured value taking into account the urea that is difficult to remove in the water treatment management device, TOC can be removed efficiently. In addition, in Figure 7 In the illustrated embodiment, the low-pressure UV 25 is arranged in the subsequent stage of the UV 21 , but the low-pressure UV 25 may be arranged in the preceding stage of the UV 21 .

[0058] By configuring a low-pressure UV25 different from UV21 as an ultraviolet irradiation device as in this method, it is not necessary to always operate UV21 that irradiates ultraviolet rays on the treated water to which the oxidant (sulfur compound) is added from the sulfur compound addition unit 24. In addition, the low-pressure UV25 can be operated at a low concentration and a low irradiation amount. Therefore, TOC in the treated water can be efficiently removed. For example, in the case where the specific organic matter is urea, control of the addition of sulfur compounds and irradiation of ultraviolet rays is performed only when the ratio of urea to TOC is higher than a given threshold value. Thus, TOC in the treated water can be efficiently removed. Usually, medium-pressure UV or high-pressure UV is used for UV treatment using sulfur compounds. Since medium-pressure UV and high-pressure UV consume a lot of power, power consumption can be reduced by using low-pressure UV.

[0059] In addition, when a low-pressure UV25 different from UV21 is configured as an ultraviolet irradiation device as in the present embodiment, the amount of ultraviolet irradiation irradiated by the low-pressure UV25 and the amount of oxidant added by the sulfur compound adding unit 24 are controlled based on the TOC value measured by the TOC measuring unit 16 and the value of the urea concentration measured by the specific organic matter measuring unit 17. As a result, TOC in the treated water can be removed more efficiently. In addition, when the treated water to which the oxidant is added from the sulfur compound adding unit 24 is irradiated with ultraviolet rays, the amount of ultraviolet irradiation from the low-pressure UV25 can also be controlled to be small. For example, in the case where the specific organic matter is urea which is difficult to decompose, two threshold values ​​(threshold value A>threshold value B) are pre-set using the ratio of the TOC conversion value of the urea concentration measured by the specific organic matter measuring unit 17 to the TOC value measured by the TOC measuring unit 16. When the ratio during measurement is above the threshold value A, based on the ratio, the control device 33 includes starting or stopping the operation of the sulfur compound addition unit 24 and UV21, and can control the amount of oxidant added by the sulfur compound addition unit 24 and the amount of ultraviolet light irradiated by UV21. When the ratio during measurement is below the threshold value B, based on the ratio, the control device 33 includes starting or stopping the operation of the low-pressure UV25, and can control the amount of ultraviolet light irradiated by the low-pressure UV25.

[0060] In addition, when the main water treatment equipment 234 is provided with a device for treating urea, two threshold values ​​(threshold value C <threshold value D) are pre-set using the ratio of the TOC conversion value of the urea concentration measured by the specific organic matter measuring unit 17 to the TOC value measured by the TOC measuring unit 16. When the ratio at the time of measurement is less than the threshold value C, the control device 33 includes starting or stopping the operation of the sulfur compound adding unit 24, and can control the amount of oxidant added by the sulfur compound adding unit 24. When the ratio at the time of measurement is greater than the threshold value D, the control device 33 includes starting or stopping the operation of the low-pressure UV 25 based on the ratio, and can control the amount of ultraviolet light irradiated by the low-pressure UV 25. The control device 33 may also use such a ratio. In addition, the control device 33 may also use the difference or ratio between the TOC value measured by the TOC measuring unit 16 and the TOC conversion value of the urea concentration measured by the specific organic matter measuring unit 17. As a result, stable treatment can be performed even when difficult-to-decompose organic matter other than urea is mixed.

[0061] (Fifth Embodiment) Fig. 9 1 is a diagram showing a fifth embodiment of the water treatment system of the present invention. Fig. 9As shown, the water treatment system in this embodiment has a water treatment facility 234, and the water treatment facility 235 includes a water treatment device 20, UV21 as an ultraviolet irradiation device, a water treatment device 22, MD27 as a degassing device, a low-pressure UV25 as an ultraviolet irradiation device whose internal pressure is lower than a given pressure (first pressure), and a water treatment device 26. Raw water as treated water is supplied to the water treatment facility 235 (specifically, the water treatment device 20). The supplied raw water is sequentially treated in the order of the water treatment device 20, UV21, the water treatment device 22, MD27, the low-pressure UV25, and the water treatment device 26. Thus, water of a given water quality (for example, pure water, etc.) is manufactured. The manufactured water is supplied from the water treatment device 26 to a point of use, other water treatment facilities, etc. In addition, the water treatment system in this embodiment has a water treatment management device 10 to which at least a part of the treated water to be supplied to the water treatment facility 235 is supplied. The water treatment management device 10 is the same as the water treatment management device in the first embodiment. The water treatment system in this embodiment includes a control device 34 and a sulfur compound adding unit 24 as an oxidant adding unit. The sulfur compound adding unit 24 is the same as that in the third embodiment. The sulfur compound adding unit 24 may be included in the water treatment equipment 235.

[0062] The control device 34 controls the operating conditions of the water treatment device constituting the water treatment equipment 235 based on the value of the TOC concentration (TOC value) output from the TOC measuring unit 16 and the value of the organic matter concentration output from the specific organic matter measuring unit 17. In this embodiment, the control device 34 controls at least one of the amount of ultraviolet irradiation irradiated by UV21, the dissolved oxygen concentration of the water to be treated by UV21 controlled by MD27, and the amount of oxidant added by the sulfur compound adding unit 24. For example, the control device 34 converts (converts) the value of the organic matter concentration output from the specific organic matter measuring unit 17 into a TOC value. This conversion is performed using the ratio of the atomic weight of carbon in the organic matter molecule to the molecular weight of the organic matter (for example, urea). The control device 34 may calculate at least one of the ultraviolet irradiation amount irradiated by UV21, the dissolved oxygen concentration of the water to be treated by UV21 controlled by MD27, and the amount of the oxidant added by the sulfur compound adding unit 24, based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value calculated based on the value of the organic matter concentration output from the specific organic matter measuring unit 17. When calculating these irradiation amounts, dissolved oxygen concentrations, and amounts of oxidants added, the control device 34 may use a given calculation formula or correspondence relationship for calculating the irradiation amount, dissolved oxygen concentration, and amount of oxidants added based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value calculated based on the value of the organic matter concentration output from the specific organic matter measuring unit 17. In addition, the control device 34 may use a comparison of a threshold value (which may be one or more) calculated in advance based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17 and the water quality (for example, TOC value, dissolved oxygen concentration) of the water supplied from the water treatment device 26 to the point of use at that time when calculating these irradiation amounts, dissolved oxygen concentrations, and oxidant addition amounts. In addition, the control device 34 may start or stop the operation of the UV 21 and the addition of the oxidant from the sulfur compound adding unit 24 based on the difference or ratio between the TOC value output from the TOC measuring unit 16 and the TOC value converted from the value of the organic matter concentration output from the specific organic matter measuring unit 17. For example, when the difference is less than the threshold value, the control device 34 may stop the operation of the UV 21 and the addition of the oxidant from the sulfur compound adding unit 24, and when the difference is greater than the threshold value, the control device 34 may start the operation of the UV 21 and the addition of the oxidant from the sulfur compound adding unit 24.

[0063] The following, Fig. 9 The processing in the control device 34 shown will be described. Fig.10 It is used to illustrate Fig. 9Flow chart of an example of processing in the control device 34 shown in FIG. Here, the case where the specific organic matter measuring unit 17 measures the concentration of urea is described as an example. In addition, the case where the control device 34 controls the amount of ultraviolet radiation irradiated by UV21 or the dissolved oxygen concentration of the treated water is described as an example.

[0064] First, the control device 34 obtains the TOC value measured by the TOC measuring unit 16 (step S41). In addition, the control device 34 obtains the value of the urea concentration measured by the specific organic matter measuring unit 17 (step S42). The control device 34 converts the obtained value of the urea concentration into a TOC value. Based on the obtained TOC value and the TOC value converted from the urea concentration, the control device 34 calculates the ultraviolet irradiation amount irradiated by UV21 or the dissolved oxygen concentration of the treated water controlled by UV21 controlled by MD27 (step S43). Then, the control device 34 controls UV21 in such a way that UV21 irradiates the calculated irradiation amount of ultraviolet rays, or controls MD27 in such a way that the dissolved oxygen concentration of the treated water becomes the calculated dissolved oxygen concentration (step S44).

[0065] Thus, in this method, a water treatment management device 10 is provided to which at least a portion of the treated water to be supplied to the water treatment equipment 235 is passed (supplied), and a measuring device measures the TOC value and specific organic matter concentration of the water in the water pipe passing through the water treatment management device 10. Based on the measured TOC value and organic matter concentration, the control device 34 controls at least one of the ultraviolet irradiation amount of the ultraviolet irradiation device provided in the water treatment equipment 235, the dissolved oxygen concentration of the treated water of the ultraviolet irradiation device controlled by the degassing device, and the amount of oxidant added to the treated water passing through the ultraviolet irradiation device. The control device 34 controls the ultraviolet irradiation amount, the dissolved oxygen concentration of the treated water, and the amount of oxidant added based on the measured value of urea that is difficult to remove by the water treatment management device. Thus, TOC can be removed efficiently.

[0066] In addition, when a low-pressure UV25 different from UV21 is configured as an ultraviolet irradiation device as in the present embodiment, the dissolved oxygen concentration of the water to be treated by the low-pressure UV25 controlled by the MD27 provided at the front stage of the low-pressure UV25 and the amount of the oxidant added by the sulfur compound adding section 24 are controlled based on the TOC value measured by the TOC measuring section 16 and the value of the concentration of urea measured by the specific organic matter measuring section 17. Thus, TOC can be removed more efficiently. In addition, when the water to be treated to which the oxidant is added from the sulfur compound adding section 24 is irradiated with ultraviolet rays, the amount of ultraviolet irradiation from the low-pressure UV25 can also be controlled to be small. For example, when the specific organic matter is urea which is difficult to decompose, two threshold values ​​(threshold value A>threshold value B) are pre-set using the ratio of the TOC conversion value of the concentration of urea measured by the specific organic matter measuring section 17 to the TOC value measured by the TOC measuring section 16. When the ratio during measurement is above the threshold value A, based on the ratio, the control device 34 includes starting or stopping the operation of the sulfur compound addition unit 24, and can control the amount of oxidant added by the sulfur compound addition unit 24. When the ratio during measurement is below the threshold value B, based on the ratio, the control device 34 includes starting or stopping the operation of the low-pressure UV25, and can control the amount of ultraviolet light irradiated by the low-pressure UV25.

[0067] In addition, when the main water treatment equipment 235 is provided with a device for treating urea, two threshold values ​​(threshold value C <threshold value D) are pre-set using the ratio of the TOC conversion value of the urea concentration measured by the specific organic matter measuring unit 17 to the TOC value measured by the TOC measuring unit 16. When the ratio at the time of measurement is less than the threshold value C, the control device 34 can control the amount of oxidant added by the sulfur compound adding unit 24, including starting or stopping the operation of the sulfur compound adding unit 24. When the ratio at the time of measurement is greater than the threshold value D, the control device 34 can control the amount of ultraviolet light irradiated by the low-pressure UV25, including starting or stopping the operation of the low-pressure UV25, based on the ratio. The control device 34 can use such a ratio, or can use the difference or ratio between the TOC value measured by the TOC measuring unit 16 and the TOC conversion value of the urea concentration measured by the specific organic matter measuring unit 17. As a result, stable treatment can be performed even when difficult-to-decompose organic matter other than urea is mixed.

[0068] (Sixth Embodiment) Fig.11 1 is a diagram showing a sixth embodiment of the water treatment system of the present invention. Fig.11As shown, the water treatment system in this embodiment has a water treatment facility 236, which includes a water treatment device 20, UV21 as an ultraviolet irradiation device, and a water treatment device 22. Raw water as water to be treated is supplied to the water treatment facility 236 (specifically, the water treatment device 20). The supplied raw water is sequentially treated in the order of the water treatment device 20, UV21, and the water treatment device 22. Thus, water of a given water quality (for example, pure water, etc.) is produced. The produced water is supplied from the water treatment device 22 to a point of use, other water treatment facilities, etc. In addition, the water treatment system in this embodiment has a water treatment management device 18 to which at least a part of the water to be treated to be supplied to the water treatment facility 236 is supplied. The water treatment management device 18 is a device obtained by removing the specific organic matter measuring unit 17 from the structural elements of the water treatment management device 10 in the first embodiment. In addition, the water treatment system in this embodiment has a control device 35 and a sulfur compound adding unit 24 as an oxidant adding unit. The sulfur compound adding unit 24 is the same as that in the third embodiment. The sulfur compound adding unit 24 may be included in the water treatment equipment 236 .

[0069] The control device 35 controls the operating conditions of the water treatment device constituting the water treatment equipment 236 based on the value of the TOC concentration (TOC value) output from the TOC measuring unit 16. In this embodiment, the control device 35 controls at least one of the ultraviolet irradiation amount irradiated by UV21 and the amount of oxidant added by the sulfur compound adding unit 24. For example, the control device 35 may calculate at least one of the ultraviolet irradiation amount irradiated by UV21 and the amount of oxidant added by the sulfur compound adding unit 24 based on the TOC value output from the TOC measuring unit 16. When calculating the ultraviolet irradiation amount and the amount of oxidant added, the control device 35 may use a given calculation formula or correspondence relationship for calculating the ultraviolet irradiation amount and the amount of oxidant added based on the TOC value output from the TOC measuring unit 16. In addition, the control device 35 may also use a comparison between the TOC value output from the TOC measuring unit 16 and the water quality (for example, TOC value, dissolved oxygen concentration) of the water supplied from the water treatment device 22 to the point of use at this time, which is calculated by using a threshold value (which may be one or more) calculated in advance. The control device 35 controls the UV21 to irradiate the ultraviolet light of the calculated ultraviolet light irradiation amount, and controls the sulfur compound adding unit 24 to add the oxidant of the calculated concentration. In addition, the control device 35 may start or stop the operation of the UV21 and the addition of the oxidant from the sulfur compound adding unit 24 based on the TOC value output from the TOC measuring unit 16. For example, when the TOC value output from the TOC measuring unit 16 is a value less than the threshold value, the control device 35 may stop the operation of the UV21 and the addition of the oxidant from the sulfur compound adding unit 24, and when the TOC value output from the TOC measuring unit 16 is greater than the threshold value, the control device 35 may start the operation of the UV21 and the addition of the oxidant from the sulfur compound adding unit 24.

[0070] The following, Fig.11 The processing in the control device 35 shown will be described. Fig.12 It is used to illustrate Fig.11 Flowchart of an example of processing in the control device 35 shown in FIG. Here, a case where the control device 35 controls the amount of ultraviolet rays irradiated by the UV 21 or the amount of the oxidant added by the sulfur compound adding unit 24 will be described as an example.

[0071] First, the control device 35 obtains the TOC value measured by the TOC measuring unit 16 (step S51). Then, the control device 35 calculates the irradiation amount of ultraviolet rays irradiated by UV21 or the addition amount of the oxidant added by the sulfur compound adding unit 24 based on the obtained TOC value (step S52). When the control device 35 calculates the irradiation amount of ultraviolet rays irradiated by UV21 in step S52, the control device 35 controls UV21 so that the ultraviolet rays of the calculated irradiation amount are irradiated from UV21. Alternatively, when the addition amount of the oxidant added by the sulfur compound adding unit 24 is calculated in step S52, the control device 35 controls the sulfur compound adding unit 24 so that the oxidant of the calculated concentration is added (step S53).

[0072] Thus, in this method, a water treatment management device 18 is provided to which at least a portion of the treated water to be supplied to the water treatment equipment 236 is passed (supplied), and a measuring device measures the TOC value of the water in the water pipe passing through the water treatment management device 18. Based on the measured TOC value, the control device 35 controls at least one of the ultraviolet irradiation amount of the ultraviolet irradiation device provided in the water treatment equipment 236 and the amount of oxidant added to the treated water passed through the ultraviolet irradiation device. Thus, TOC can be removed stably and efficiently. In addition, by providing an oxidant addition unit in the front stage of the ultraviolet irradiation device to treat TOC, the effect of improving TOC removal performance can be obtained.

[0073] In the first to sixth embodiments described above, the treated water passed to the water treatment management device 10 and the water treatment management device 18 is not limited to raw water, but may be any treated water in the water treatment system. If the raw water is reclaimed water or recycled water, it may be any treated water in the water treatment device in the system that produces the reclaimed water or recycled water. In addition, a plurality of water treatment management devices 10 and 18 may be provided according to the treated water. In addition, in addition to the measured value of the treated water in the water treatment management device, the irradiation amount of ultraviolet rays in the water treatment system may be controlled based on the irradiation amount of ultraviolet rays and the dissolved oxygen concentration in the water treatment management device.

[0074] (Example) <Example 1-1> Fig.13 1 is a diagram showing the structure of Example 1-1 of the water treatment system of the present invention. Fig.13As shown, a water treatment management device 10 is arranged in parallel in a water treatment facility 200 composed of a water treatment device 201 for pretreatment, an ultraviolet irradiation device (UV) 202, and an ion exchange resin filling device (CP) 203, and water containing TOC is treated. The TOC measuring unit 204 measures the treated water of CP203. The water treatment device 201 has a function of removing urea from water containing TOC. The water treatment management device 10 is the device in the above-mentioned embodiment. A TOC measuring unit 16 and a specific organic matter measuring unit 17 are provided in the treated water pipeline of the water treatment management device 10. Based on the measured value obtained by the water treatment management device 10 (the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17), the control device 30 sets and controls the irradiation amount of ultraviolet rays irradiated by UV202.

[0075] <Comparative Example 1-1> Fig.14 1-1 is a diagram showing the structure of Comparative Example 1-1 for comparison with Example 1-1. Fig.14 As shown, in Fig.13 The water treatment equipment 200 shown in the figure is provided with a water treatment management device 50 in parallel, and water containing TOC is treated. The TOC measuring unit 204 measures the treated water of CP203. The water treatment management device 50 has Fig.13 The structure of the specific organic matter measuring unit 17 is excluded from the water treatment management device 10 shown. Based on the measurement value obtained by the water treatment management device 50 (the measurement value measured by the TOC measuring unit 16), the control device 40 sets and controls the irradiation amount of ultraviolet rays irradiated by UV202 in the same relationship between the measurement value and the irradiation amount as in Example 1-1.

[0076] <Example 1-2> Fig.15 1 is a diagram showing the structure of Embodiment 1-2 of the water treatment system of the present invention. Fig.15 As shown, in Fig.13 The structure used in Example 1-1 shown in the figure includes a water treatment device 210 in which a MD 205 as a degassing device is installed in the front stage of UV 202, and water containing TOC is treated in the same way. The TOC measuring unit 204 measures the treated water of CP 203. The water treatment management device 10 is used Fig.13The device in the structure of the embodiment 1-1 shown. A vacuum degassing membrane using a degassing membrane and a vacuum pump is used as MD205. Based on the measurement value obtained by the water treatment management device 10 (the difference between the measurement value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measurement value measured by the specific organic matter measuring unit 17), the control device 31 sets the dissolved oxygen concentration (DO concentration) of the UV treated water, and adjusts and controls the vacuum degree of MD205 so that the measurement value of the dissolved oxygen meter becomes the set value. In addition, the dissolved oxygen meter is set between MD205 and UV202.

[0077] <Comparative Example 1-2> Fig.16 : is a diagram showing the structure of Comparative Example 1-2 for comparison with Example 1-2. Fig.16 As shown, in Fig.15 The water treatment equipment 210 shown in the figure is provided with a water treatment management device 50 in parallel to perform water treatment on water containing TOC. The TOC measuring unit 204 measures the treated water of CP203. The water treatment management device 50 has Fig.15 The structure of the specific organic matter measuring unit 17 is excluded from the water treatment management device 10 shown. Based on the measurement value obtained by the water treatment management device 50 (the measurement value measured by the TOC measuring unit 16), the control device 41 sets and controls the dissolved oxygen concentration (DO concentration) in the same relationship between the measurement value and the dissolved oxygen concentration as in Example 1-2.

[0078] The detailed test conditions of Examples 1-1 and 1-2 and Comparative Examples 1-1 and 1-2 are shown below.

[0079] Ultraviolet irradiation device: Low-pressure UV oxidation device manufactured by Japan Photo Science Co., Ltd. Ion exchange resin filling device: Strong acid cation exchange resin AMBERJET 1024 H type (manufactured by Organo Co., Ltd.), strong base anion exchange resin AMBERJET 4002 OH type (manufactured by Organo Co., Ltd.) Mixed bed filling Specific organic matter (urea) measurement unit: ORUREA manufactured by Organo Water treatment device: Consists of urea removal device, filtration device, activated carbon, ion exchange resin filling device, reverse osmosis membrane device TOC concentration of water containing TOC: 500ppb-C to 700ppb-C TOC Meter: Sievers M500e Reverse osmosis membrane unit for water treatment management system: 2nd stage treatment Irradiation control: controlled by the number of lights on Degassing device: vacuum degassing membrane Dissolved oxygen control: Use inverter to adjust the vacuum level of the degasser DO concentration of treated water: 1ppm Urea removal unit: retention tank with sodium hypochlorite and sodium bromide added The results of Example 1-1, Example 1-2 and Comparative Example 1-1, Comparative Example 1-2 are shown in Table 1 and Table 2. In addition, the "urea-TOC conversion value" in Table 1 and Table 2 is a value obtained by converting the urea concentration measured by the specific organic matter measuring unit 17 into a TOC value (the same applies hereinafter).

[0080] [Table 1] [Table 2] As shown in Table 1, in both Example 1-1 and Comparative Example 1-1, the values ​​measured by the TOC measuring unit 204 were kept below 0.5 ppb. The irradiation amount of ultraviolet rays irradiated by UV 202 in Example 1-1 was 0.1 kWh / m 3 On the other hand, as a result, the irradiation amount of ultraviolet rays irradiated by UV202 in Comparative Example 1-1 was controlled to increase to 0.2 kWh / m 3 ~0.3kWh / m 3 . This is because, in Comparative Example 1-1, the ultraviolet irradiation amount is controlled using the measured value that also includes TOC derived from urea that is difficult to remove by ultraviolet treatment. Therefore, the irradiation amount becomes excessive relative to TOC other than urea. Therefore, the following result is obtained: by controlling the ultraviolet irradiation amount using the TOC measured value excluding the urea measured value (TOC conversion value), it is possible to control without becoming an excessive irradiation amount. In addition, as shown in Table 2, the following result is also obtained in Example 1-2 and Comparative Example 1-2: by controlling the dissolved oxygen concentration using the TOC measured value excluding the urea measured value (TOC conversion value), it is possible to control without excessively reducing the dissolved oxygen concentration.

[0081] <Example 2-1> Fig.17 2-1 is a diagram showing the structure of the water treatment system of the present invention. Fig.17As shown, a water treatment management device 10 is arranged in parallel in a water treatment facility 200 composed of a water treatment device 201 for pretreatment, an ultraviolet irradiation device (UV) 206 as a medium-pressure UV device, and an ion exchange resin filling device (CP) 203, and water containing TOC is treated. The water treatment management device 10 is the device in the above-mentioned embodiment. A TOC measuring unit 16 and a specific organic matter measuring unit 17 are provided in the treated water pipeline of the water treatment management device 10. In addition, a sulfur compound adding unit 24 is provided to add an oxidant to the treated water passing through the UV 206. The sulfur compound adding unit 24 may also be included in the water treatment facility 200. Based on the measured value obtained by the water treatment management device 10 (the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17), the control device 32 sets the amount of the oxidant added by the sulfur compound adding unit 24 and controls it. The results are shown in Table 3. As in Example 1-1 and Example 1-2, the value measured by the TOC measuring unit 204 was less than 0.5 ppb, and a result indicating that stable treatment was possible was obtained.

[0082] [Table 3] <Example 2-2> Fig.18 2 is a diagram showing the structure of Example 2-2 of the water treatment system of the present invention. Fig.18 As shown, the structure used in Example 2-2 is Fig.17 The structure shown is the same. Based on the measured value obtained by the water treatment management device 10 (the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17), the control device 30 sets and controls the irradiation amount of ultraviolet rays irradiated by UV206. The results are shown in Table 4. As with Example 1-1 and Example 1-2, the value measured by the TOC measuring unit 204 is less than 0.5 ppb, and the result that the treatment can be performed stably is obtained.

[0083] [Table 4] <Example 3-1> Fig.19 1 is a diagram showing the structure of Example 3-1 of the water treatment system of the present invention. Fig.19As shown, a water treatment management device 10 is arranged in parallel in a water treatment facility 220 composed of a water treatment device 201 for pretreatment, an ultraviolet irradiation device (UV) 206, an ion exchange resin filling device (CP) 203, a degassing device (MD) 205, a low-pressure ultraviolet irradiation device (UV) 207, and an ion exchange resin filling device (CP) 208, and water treatment is performed on water containing TOC. The water treatment management device 10 is the device in the above-mentioned embodiment. A TOC measuring unit 16 and a specific organic matter measuring unit 17 are arranged in the treated water pipeline of the water treatment management device 10. Based on the measured value obtained by the water treatment management device 10 (the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17), the control device 33 sets and controls the irradiation amount of ultraviolet rays irradiated by UV206 and UV207 respectively. At this time, two threshold values ​​(threshold value E>threshold value F) are set in advance, and when the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17 is greater than the threshold value E, the control device 33 controls the irradiation amount of ultraviolet rays irradiated from UV206. In addition, when the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17 is less than the threshold value E and greater than the threshold value F, the control device 33 controls the irradiation amount of ultraviolet rays irradiated from UV206 and UV207 to a fixed value. In addition, when the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17 is less than the threshold value F, the control device 33 controls the irradiation amount of ultraviolet rays irradiated from UV207. The results are shown in Table 5. The value measured by the TOC measuring unit 204 is less than 0.5 ppb, and a result that the treatment can be performed stably is obtained. The sulfur compound adding unit 24 may also be included in the water treatment equipment 220.

[0084] [Table 5] <Example 3-2> Fig. 20 2 is a diagram showing the structure of Example 3-2 of the water treatment system of the present invention. Fig. 20 As shown, the structure used in Example 3-2 is Fig.19The structure shown is the same. The control device 34 sets the irradiation amount of ultraviolet rays irradiated by UV206 and the dissolved oxygen concentration of the UV treated water based on the measured value obtained by the water treatment management device 10 (the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17), and adjusts the vacuum degree of MD205 to control so as to become the set value. At this time, two thresholds are set in advance (threshold value G>threshold value H). When the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17 is greater than the threshold value G, the control device 34 controls the irradiation amount of ultraviolet rays irradiated from UV206. In addition, when the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17 is less than the threshold value G and is greater than the threshold value H, the control device 34 controls the irradiation amount of UV206 and the dissolved oxygen concentration of the UV treated water to be constant values. In addition, when the difference between the measured value measured by the TOC measuring unit 16 and the TOC conversion value of the urea measured value measured by the specific organic matter measuring unit 17 is less than the threshold value H, the control device 34 sets the dissolved oxygen concentration of the UV treated water, and adjusts and controls the vacuum degree of MD205 so as to achieve the set value. The results are shown in Table 6. The value measured by the TOC measuring unit 204 is less than 0.5 ppb, and a result that stable treatment can be obtained is obtained.

[0085] [Table 6] <Example 4-1> Fig.21 4-1 is a diagram showing the structure of the water treatment system of the present invention. Fig.21 As shown, in a water treatment device 200 composed of a water treatment device 201 for pretreatment, an ultraviolet irradiation device (UV) 206 as a medium-pressure UV device, and an ion exchange resin filling device (CP) 203, a water treatment management device 18 is arranged in parallel to treat water containing TOC. The water treatment management device 18 is the device in the above-mentioned embodiment. A TOC measuring unit 16 is set in the treated water pipeline of the water treatment management device 18. In addition, a sulfur compound adding unit 24 is provided to add an oxidant to the treated water passing through the UV206. The sulfur compound adding unit 24 may also be included in the water treatment device 200. In addition, a urea removal function is not provided in the water treatment device 201. Based on the measurement value obtained by the water treatment management device 18 (the measurement value measured by the TOC measuring unit 16), the control device 35 sets and controls the concentration of persulfuric acid added by the sulfur compound adding unit 24. The results are shown in Table 7. The results of Comparative Example 2 shown in Table 7 are Fig.14The water treatment device 201 shown in the figure does not have a urea removal function, and the UV 206 is a medium-pressure UV device. In addition, a urea meter is provided in parallel with the TOC measuring unit 16, and the urea concentration is measured using the urea meter. Fig.21 In the configuration shown, the value measured by the TOC measuring unit 204 was less than 0.5 ppb, and the result that stable treatment was possible was obtained as shown in Table 7. In Comparative Example 2, urea was not removed, and the value measured by the TOC measuring unit 204 was greater than 1 ppb.

[0086] [Table 7] <Example 4-2> Fig. 22 4-2 is a diagram showing the structure of the water treatment system of the present invention. Fig. 22 As shown, in a water treatment device 200 composed of a water treatment device 201 for pretreatment, an ultraviolet irradiation device (UV) 206 as a medium-pressure UV device, and an ion exchange resin filling device (CP) 203, a water treatment management device 18 is arranged in parallel to perform water treatment on water containing TOC. The water treatment management device 18 is the device in the above-mentioned embodiment. A TOC measuring unit 16 is set in the treated water pipeline of the water treatment management device 18. In addition, a sulfur compound adding unit 24 is provided to add an oxidant to the treated water passing through UV206. The sulfur compound adding unit 24 may also be included in the water treatment device 200. In addition, a urea removal function is not provided in the water treatment device 201. Based on the measurement value obtained by the water treatment management device 18 (the measurement value measured by the TOC measuring unit 16), the control device 35 sets and controls the irradiation amount of ultraviolet rays irradiated by UV206. The results are shown in Table 8. The results of Comparative Example 2 shown in Table 8 are Fig.14 The water treatment device 201 shown in the figure does not have a urea removal function and the UV 206 is a measurement result in a structure in which a medium-pressure UV device is used. In addition, a urea meter is provided in parallel with the TOC measuring unit 16, and the urea concentration is measured using the urea meter. Fig. 22 In the configuration shown, as shown in Table 8, the value measured by the TOC measuring unit 204 was less than 0.5 ppb, indicating that stable treatment was possible. In Comparative Example 2, urea was not removed, and the value measured by the TOC measuring unit 204 was greater than 1 ppb.

[0087] [Table 8] Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. The structure and details of the present invention can be modified in various ways that can be understood by those skilled in the art within the scope of the present invention.

[0088] This application claims the benefit of priority based on Japanese patent application No. 2022-147932, filed on September 16, 2022, the disclosure of which is incorporated herein in its entirety by reference.

Claims

1. A water treatment system comprising: Water treatment equipment, which has multiple water treatment devices to treat the water to be treated; a water treatment management device supplied with the water to be treated to be supplied to any one of the plurality of water treatment devices; as well as a control device for controlling the operating conditions of the water treatment device, The water treatment management device comprises: a first measuring unit for measuring the TOC concentration of water passing through a water pipe to the water treatment management device; as well as a second measuring unit for measuring the concentration of specific organic matter in water passing through the water pipe of the water treatment management device; The control device controls the operating conditions of the water treatment device based on the TOC concentration measured by the first measuring unit and the specific organic matter concentration measured by the second measuring unit.

2. The water treatment system according to claim 1, wherein: The water treatment system includes an ultraviolet irradiation device as the water treatment device, The control device controls the irradiation amount of the ultraviolet irradiation device as the operating condition.

3. The water treatment system according to claim 2, wherein: The control device controls at least one of the number of lamps lit, the processing flow rate, and the lamp dimming of the ultraviolet irradiation device.

4. The water treatment system according to claim 2 or 3, wherein: The water treatment system further includes a degassing device disposed in front of the ultraviolet irradiation device as the water treatment device. The control device controls at least one of the ultraviolet irradiation amount and the dissolved oxygen concentration of water to be treated by the ultraviolet irradiation device.

5. The water treatment system according to claim 2 or 3, wherein: The water treatment system includes an oxidant adding unit, which adds an oxidant to the water to be treated which flows into the ultraviolet irradiation device. The control device controls at least one of the amount of oxidant added by the oxidant addition unit and the irradiation amount of the ultraviolet irradiation device based on the TOC concentration measured by the first measurement unit and the specific organic matter concentration measured by the second measurement unit.

6. The water treatment system according to claim 5, wherein: The oxidizing agent is a sulfur compound containing a peroxide group.

7. The water treatment system according to claim 2 or 3, wherein: The water treatment system further includes a low-pressure ultraviolet irradiation device as the water treatment device, which is arranged in a preceding stage or a succeeding stage of the ultraviolet irradiation device.

8. The water treatment system according to claim 7, wherein: The control device controls the irradiation amount of ultraviolet rays irradiated by the low-pressure ultraviolet irradiation device based on the TOC concentration measured by the first measuring unit and the organic matter concentration measured by the second measuring unit.

9. A water treatment system comprising: Water treatment equipment, which has multiple water treatment devices to treat the water to be treated; a water treatment management device supplied with the water to be treated to be supplied to any one of the plurality of water treatment devices; an oxidant adding unit, which adds an oxidant to the treated water; as well as a control device for controlling the operating conditions of the water treatment device, The water treatment management device includes a measuring unit for measuring the TOC concentration of water flowing through a water flow line of the water treatment management device. The control device controls at least one of the amount of oxidant added by the oxidant addition unit and the amount of irradiation of the ultraviolet irradiation device among the multiple water treatment devices on the treated water to which the oxidant is added by the oxidant addition unit based on the TOC concentration measured by the measuring unit.

10. A water treatment method comprising the following steps: The TOC concentration of water in the water pipeline passing through the water treatment management device is measured, wherein: The water treatment management device is supplied with the water to be treated to be supplied to any one of the plurality of water treatment devices of the water treatment facility that treats the water to be treated using the plurality of water treatment devices; Determining the concentration of specific organic matter in water passing through a water pipeline to the water treatment management device; as well as Based on the measured TOC concentration and the measured specific organic matter concentration, operating conditions of the water treatment device are controlled.

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