Patent Publication Number: US-2022212953-A1

Title: Method for predicting particulate breakthrough time for non-regenerative ion exchange resin device and method for managing non-regenerative ion exchange resin device

Description:
TECHNICAL FIELD 
     The present invention relates to a method for predicting a particulate breakthrough time of a non-regenerative ion exchange resin device, and a method for managing a non-regenerative ion exchange resin device based on the predicted particulate breakthrough time. 
     BACKGROUND ART 
     In the electronic industry field such as liquid crystals and semiconductors for which high-purity pure water and ultrapure water are required, a non-regenerative ion exchange resin device is often installed in order to remove a very small amount of ions at the end of a primary pure water production device and a secondary pure water production device. As the non-regenerative ion exchange resin device, a mixed bed type ion exchange resin device is often used, but a single-bed type or double-bed type ion exchange resin device is also used. 
     Since the non-regenerative ion exchange resin device is installed in front of the point of use, if an ion leakage occurs from the non-regenerative ion exchange resin device, there is a risk of an operation of a production facility being stopped. Therefore, in the related art, the non-regenerative ion exchange resin device has been replaced at an early stage, and it has been difficult to use the maximum ion exchange performance of the non-regenerative ion exchange resin device. 
     As a countermeasure therefor, Patent Literature 1 describes a method in which, since the TOC in primary pure water in front of an ion exchange device in a secondary pure water production device decomposes into carbonic acid in a UV oxidation device, and most of the ion load of the non-regenerative ion exchange device can be considered as carbonic acid, a carbonic acid load amount of the ion exchange device is continuously monitored, and a replacement time for the ion exchange device is predicted from the carbonic acid exchange capacity of the ion exchange device set in advance and the carbonic acid load amount. 
     In addition, Patent Literature 2 discloses a method in which a compact resin column in which the same ion exchange resin as the ion exchange resin is filled into a column smaller than the column of the non-regenerative ion exchange resin device is installed in parallel to the non-regenerative ion exchange resin device, the same water to be treated as water to be treated that flows through the non-regenerative ion exchange resin device flows through the compact resin column, and an ion breakthrough time of the non-regenerative ion exchange resin device is predicted based on treated water data in the compact resin column. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: Japanese Patent Laid-Open No. H11-101761 
         Patent Literature 2: Japanese Patent Laid-Open No. 2012-154634 
       
    
     SUMMARY OF INVENTION 
     Technical Problem 
     However, in each of the methods of predicting a replacement time for a non-regenerative ion exchange resin device described in Patent Literature 1 and Patent Literature 2, the breakthrough time is calculated based on ions from the non-regenerative ion exchange resin device, but since not only ions but also particulates may break through the non-regenerative ion exchange resin device, there is a risk of an operation of the production facility being stopped if particulates leak to the point of use, and there has been no conventional method for predicting a breakthrough time of particulates from a non-regenerative ion exchange resin device. 
     The present invention has been made in view of the above circumstances and an objective of the present invention is to provide a method for predicting a particulate breakthrough time of a non-regenerative ion exchange resin device and a method for managing a non-regenerative ion exchange resin device provided in a pure water production device based on the particulate breakthrough time predicted by the method. 
     Solution to Problem 
     In order to achieve the above objective, primarily, the present invention provides a method for predicting a particulate breakthrough time of a non-regenerative ion exchange resin device in which ion exchange is filled into a column, including: measuring the number of particulates in inflow water in the non-regenerative ion exchange resin device; causing water to be treated with a known number of particulates to flow through a compact resin column in which the same ion exchange resin as the ion exchange resin is filled into a column smaller than the column of the non-regenerative ion exchange resin device and measuring the number of particulates in outlet water in the compact resin column; and predicting a particulate breakthrough time of the non-regenerative ion exchange resin device based on the measured number of particulates in the inflow water in the non-regenerative ion exchange resin device and the measured number of particulates in the outlet water in the compact resin column (Invention 1). 
     According to the invention (Invention 1), when water flows through the compact resin column into which the same ion exchange resin as the ion exchange resin in the non-regenerative ion exchange resin device is filled under conditions in which particulate breakthrough occurs earlier than in the non-regenerative ion exchange resin device, particulate breakthrough occurs in the compact resin column earlier than particulate breakthrough in the non-regenerative ion exchange resin device. Therefore, based on the ratio between filling volumes of the ion exchange resins in the non-regenerative ion exchange resin device and the compact resin column and the difference in water flow conditions between the two, it is possible to predict a particulate breakthrough time of the non-regenerative ion exchange resin device. 
     In the invention (Invention 1), preferably, the compact resin column is provided in parallel to the non-regenerative ion exchange resin device, and the inflow water in the non-regenerative ion exchange resin device is used as water to be treated in the compact resin column (Invention 2). 
     According to the invention (Invention 2), it is possible to predict a particulate breakthrough time of the non-regenerative ion exchange resin device in real time according to the change in operation conditions of the non-regenerative ion exchange resin device. 
     In the invention (Invention 1), the compact resin column through which water to be treated with a known number of particulates flows may be provided independently from the non-regenerative ion exchange resin device (Invention 3). 
     According to the invention (Invention 3), when the number of particulates in water to be treated that flows through the compact resin column is set to be larger than that of water to be treated in the non-regenerative ion exchange resin device, it is possible to predict a particulate breakthrough time of the non-regenerative ion exchange resin device in a very short time. 
     In the inventions (Inventions 1 to 3), preferably, an ion exchange resin layer height of the compact resin column is 1/10 to ¾ of an ion exchange resin layer height of the non-regenerative ion exchange resin device (Invention 4). In addition, in the invention (Invention 4), preferably, a diameter of the compact resin column is ⅕ to 1/40 of a diameter of the non-regenerative ion exchange resin device (Invention 5). 
     According to the inventions (Inventions 4 and 5), when the ion exchange resin layer height and the diameter of the compact resin column are set to a predetermined ratio with respect to the non-regenerative ion exchange resin device, since particulate breakthrough in the compact resin column occurs some time before that of the non-regenerative ion exchange resin device, it is possible to appropriately cope with particulate breakthrough in the non-regenerative ion exchange resin device. 
     In the inventions (Inventions 1 to 5), preferably, water to be treated flows through the compact resin column with a water flow SV that is 1 to 10 times the water flow SV in the non-regenerative ion exchange resin device (Invention 6). 
     According to the invention (Invention 6), when the water flow SV in the compact resin column is set to a predetermined ratio with respect to the non-regenerative ion exchange resin device, since particulate breakthrough in the compact resin column occurs some time before that of the non-regenerative ion exchange resin device, it is possible to appropriately cope with particulate breakthrough in the non-regenerative ion exchange resin device. 
     In the inventions (Inventions 1 to 6), preferably, a plurality of the compact resin columns of which at least one of a column diameter, a resin layer height, and a water flow SV differs are disposed (Invention 7). 
     According to the invention (Invention 7), since a particulate breakthrough time of the non-regenerative ion exchange resin device is predicted based on the particulate breakthrough time of the compact resin columns in which the resin volume of the ion exchange resin and water flow conditions differ, and since prediction results of the particulate breakthrough time of the plurality of non-regenerative ion exchange resin devices are obtained from respective compact resin columns, according to comprehensive determination based on this, the prediction accuracy can be improved. 
     In the invention (Invention 6), preferably, a time when the number of particulates in outlet water in the compact resin column exceeds a predetermined number is used as a particulate breakthrough point of the compact resin column, and based on a breakthrough time of the compact resin column, a ratio between the water flow SV in the non-regenerative ion exchange resin device and the water flow SV in the compact resin column, and the number of particulates in the inflow water in the non-regenerative ion exchange resin device and the number of particulates in the outlet water in the compact resin column, a particulate breakthrough time of the non-regenerative ion exchange resin device is predicted (Invention 8). 
     According to the invention (Invention 8), criteria for determining particulate breakthrough in the compact resin column are set as desired conditions, and based on the particulate breakthrough time, it is possible to predict the particulate breakthrough time of the non-regenerative ion exchange resin device at a desired level. 
     In addition, secondly, the present invention provides a method for managing a non-regenerative ion exchange resin device, including, based on the particulate breakthrough time of the non-regenerative ion exchange resin device predicted by the inventions (Inventions 1 to 8), replacing or maintaining the non-regenerative ion exchange resin device in a pure water production device including the non-regenerative ion exchange resin device (Invention 9). 
     According to the invention (Invention 9), since a plan for resin replacement or maintenance of the non-regenerative ion exchange resin device is made based on the breakthrough time of the non-regenerative ion exchange resin device predicted according to the breakthrough time of particulates in the compact resin column, it is possible to prevent particulates from leaking from the pure water production device beforehand. 
     Effects of Invention 
     According to the present invention, since it is possible to predict a particulate breakthrough time of the non-regenerative ion exchange resin device using the compact resin column into which the same ion exchange resin as the ion exchange resin in the non-regenerative ion exchange resin device is filled, it is possible to prevent particulates from leaking from the pure water production device including the non-regenerative ion exchange resin device beforehand. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a flowchart showing an ultrapure water production device to which a method for predicting a particulate breakthrough time of a non-regenerative ion exchange resin device according to a first embodiment of the present invention can be applied. 
         FIG. 2  is a schematic view showing a prediction method using a compact resin column in the same embodiment. 
         FIG. 3  is a schematic view showing a prediction method using a compact resin column according to a second embodiment of the present invention. 
         FIG. 4  is a graph showing a particulate breakthrough curve in Example 1. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, a method for predicting a particulate breakthrough time of a non-regenerative ion exchange resin device of the present invention will be described in detail. 
     First Embodiment 
     &lt;Ultrapure Water Production Device&gt; 
       FIG. 1  shows an ultrapure water production device to which a method for predicting a particulate breakthrough time of a non-regenerative ion exchange resin device according to the present embodiment can be applied. In  FIG. 1 , an ultrapure water production device  1  includes a pretreatment system  2 , a primary pure water device  3  and a secondary pure water device (sub-system)  4  that treats primary pure water and the ultrapure water production device  1  treats raw water (industrial water, city water, well water, etc.) W for production. 
     In the pretreatment system  2  including aggregation, pressure flotation (precipitation), and filter (filtration membrane) devices, suspended substances and colloidal substances in the raw water W are removed. In addition, in this process, it is possible to remove polymer-based organic substances, hydrophobic organic substances, and the like. 
     A primary pure water production device  3  includes a first tank  11  in which pretreated water W 0  is stored, a heat exchanger  12 , a reverse osmosis membrane device (RO device)  13 , a second tank  14 , an UV oxidation device  15  and an ion exchange device (a mixed bed type or a 4-bed 5-tower type, etc.)  16 . In the primary pure water production device  3 , ions and organic components in raw water are removed. Primary pure water W 1  produced by the primary pure water production device is sent to a secondary pure water production device  4  via a pipe  17 . 
     The secondary pure water production device  4  includes a primary pure water tank  21 , a heat exchanger  22 , a deaeration device  23 , a low pressure UV oxidation device (UV oxidizing device)  24 , a non-regenerative ion exchange device  25  and an ultrafiltration membrane (UF membrane)  26 . In the low pressure UV oxidation device  24 , TOC is additionally decomposed from organic acids to CO 2  with ultraviolet rays of 185 nm emitted from a low pressure UV lamp. Organic substances and CO 2  produced by the decomposition are removed in the subsequent non-regenerative ion exchange device  25 . In the ultrafiltration membrane device  26 , particulates are removed, and outflow particles from an ion exchange resin are also removed. 
     Ultrapure water W 2  produced by the secondary pure water production device  4  is sent to a point of use  5  via a pipe  27 , and unused ultrapure water is returned to the primary pure water tank  21  via a pipe  28 . Here, if the pressure of a pump  22  is insufficient, a boosting pump may be installed (for example, between the UV oxidizing device  24  and the non-regenerative ion exchange device  25 ) upstream from the non-regenerative ion exchange device  25 . 
     &lt;Non-Regenerative Ion Exchange Resin Device&gt; 
     In the ultrapure water production device described above, as shown in  FIG. 2 , water W 3  to be treated flows through the non-regenerative ion exchange resin device  25  and flows out as treated water. The non-regenerative ion exchange resin device  25  includes a column  25 A and an ion exchange resin  25 B filled into the column  25 A. 
     The non-regenerative ion exchange resin device  25  is installed in the final part of the primary pure water production device or in the secondary pure water production device, and the water quality of the water to be treated is generally at levels of 30 μg/L or less of carbonate ions as C, 1 μg/L or less of chloride ions, 1 μg/L or less of sodium ions, 0.1 μg/L or less of ammonium ions, 10 μg/L or less of boron as B, and 50 μg/L or less of silica as SiO 2 . 
     As the non-regenerative ion exchange resin device  25 , a mixed bed type ion exchange resin device in which an H type strong cation exchange resin and an OH type strong anion exchange resin are mixed is often used. The mixing ratio of the cation exchange resin and the anion exchange resin in the mixed bed type ion exchange resin device varies depending on the quality of water to be treated, but is preferably cation exchange resin/anion exchange resin=0.2 to 1.0. In a general case, in the present embodiment, the resin layer height in the mixed bed type ion exchange resin device is about 0.3 to 2 m, the column diameter is about 0.3 to 2 m, and the amount of resins is about 0.02 to 6 m 3 . The water flow SV in the non-regenerative ion exchange resin device is about 30 to 150. 
     &lt;Compact Resin Column&gt; 
     Here, a part of water W 3  to be treated supplied to the non-regenerative ion exchange resin device  25  flows through a first path  31  including a first particle counter  34  provided in parallel to the non-regenerative ion exchange resin device  25 , a second path  32  including a first compact resin column  35 , a second particle counter  36 , a flow rate regulating valve  37  and a first flow meter  38 , and a third path  33  including a second compact resin column  39 , a third particle counter  40 , a flow rate regulating valve  41  and a second flow meter  42 . Here,  30  indicates an on-off valve. 
     The first compact resin column  35  and the second compact resin column  39  are obtained by filling the same ion exchange resin as the ion exchange resin filled into the non-regenerative ion exchange resin device  25  into a column smaller than the column of the non-regenerative ion exchange resin device  25 , and preferably have a cylindrical shape. It is preferable to use the compact resin columns  35  and  39  with both ends in which a mesh having a diameter smaller than the particle size of the resin so that the ion exchange resin does not leak is provided. Here, the compact resin columns  35  and  39  differ in one or more of the column diameter, the resin layer height, and the water flow SV. 
     The first compact resin column  35  and the second compact resin column  39  preferably have an ion exchange resin layer height of 1/10 to ¾ of the ion exchange resin layer height of the non-regenerative ion exchange resin device  25 . In addition, they have a diameter that is ⅕ to 1/40 of the non-regenerative ion exchange resin device  25 , and preferably specifically 20 to 100 mm. When the first compact resin column  35  and the second compact resin column  39  are set to have the above ion exchange resin layer height and diameter, the amount of the ion exchange resin filled in is 0.25 to 15 vol % with respect to the non-regenerative ion exchange resin device  25 . If the amount of the ion exchange resin filled in is smaller than 0.25 vol % of the non-regenerative ion exchange resin device  25 , the particulate breakthrough time of the first compact resin column  35  and the second compact resin column  39  is too short, and it is difficult to predict the time accurately. On the other hand, if the amount thereof exceeds 15 vol %, the difference in the particulate breakthrough time from the non-regenerative ion exchange resin device  25  becomes small, which is not efficient. 
     &lt;Method for Predicting Particulate Breakthrough Time&gt; 
     Next, a method for predicting a particulate breakthrough time of the non-regenerative ion exchange device  25  in which the first compact resin column  35  and the second compact resin column  39  described above are arranged side by side will be described. 
     (Water Flow Method and Water Flow Conditions) 
     First, while water W 3  to be treated flows through the non-regenerative ion exchange resin device  25  at a predetermined flow rate, the same water W 3  to be treated flows through the first compact resin column  35  and the second compact resin column  39 , and the number of particulates in the treated water (outflow water) W 4  and W 5  in the compact resin columns  35  and  39  is measured with the second particle counter  36  and the third particle counter  40 . On the other hand, the number of particulates (number of inlet particulates) in the water W 3  to be treated is measured with the first particle counter  34 . It is preferable that the types (organic substances, silica, metals, etc.), physical properties and the like of particulates in the water W 3  to be treated be clearly determined in advance by an analysis method such as a centrifugal filtration method. Here, in the present embodiment, the water W 3  (W 4 , W 5 , etc.) to be treated is sent to a recovery system  43  and reused. 
     In this case, in the first compact resin column  35  and the second compact resin column  39 , it is preferable for water W 3  to be treated to flow with a water flow SV that is 1 to 10 times the water flow SV in the non-regenerative ion exchange resin device  25 . If the water flow SV is too small, a time taken for particulates to break becomes too long, and it takes a long time to predict the particulate breakthrough time of the non-regenerative ion exchange resin device. On the other hand, when the water flow SV is too large, particulate breakthrough occurs due to a short-term water flow, and thus the prediction accuracy of the particulate breakthrough time deteriorates. Here, SV is [water flow amount]/[filling resin volume]. The first flow meter  38  and the second flow meter  42  measure water flow rates in the first compact resin column  35  and the second compact resin column  39 , and the SV may be calculated based on the measured flow rate and the resin filling volume in the first compact resin column  35  and the second compact resin column  39 . Then, the flow rates in the first compact resin column  35  and the second compact resin column  39  may be adjusted with the flow rate regulating valve  37 , and the flow rate regulating valve  41  so that a desired SV is obtained. Here, the water flow LV is not particularly limited, but it is preferably the same as the water flow LV in the non-regenerative ion exchange resin device  25 . 
     When the water W 3  to be treated continuously flows, since the first compact resin column  35  and the second compact resin column  38  have a smaller resin filling amount than the non-regenerative ion exchange resin device  25  and have the same or higher SV, particulate breakthrough occurs in advance with respect to the non-regenerative ion exchange resin device  25 . Therefore, if the changes in the number of particulates in the water W 3  to be treated and the number of particulates in outflow water in the compact resin columns  35  and  39  over time are measured, and the measured number of particulates in outflow water in the compact resin columns  35  and  39  exceeds a preset numerical value, it is determined that particulate breakthrough has occurred. Then, it is possible to predict a particulate breakthrough time of the non-regenerative ion exchange resin device  25  based on the particulate breakthrough time of the first compact resin column  35  and the second compact resin column  39 , the filling ratio of the ion exchange resin in the first compact resin column  35  and the second compact resin column  39  with respect to the non-regenerative ion exchange resin device  25 , and the proportion of the water flow SV. Here, it is preferable that the trends of the number of particulates in the compact resin columns  35  and  39  and the number of particulates in the water W 3  to be treated be checked constantly with the first particle counter  34 , the second particle counter  36  and the third particle counter  40 . 
     (Prediction of Particulate Breakthrough Time) 
     In the present embodiment, when a time taken for particulates in the compact resin column to breakthrough and a time taken for particulates in the non-regenerative ion exchange resin device to breakthrough are formulated from specifications (the resin layer height, SV, etc.) of the compact resin column, it is possible to predict the particulate breakthrough time in the specifications of the actual non-regenerative ion exchange resin device. For example, based on the relationship between the time taken for particulates in the compact resin column to breakthrough and the SV, formulation is performed by appropriate correction, and the particulate breakthrough time of the non-regenerative ion exchange resin device  25  is calculated in consideration of safety, and this time may be used as a time for replacing and maintaining the non-regenerative ion exchange resin device  25 . 
     Specifically, in the following Formula 1, correction is performed in consideration of the safety ratio according to scale-up (a column diameter, a fluid flow, etc.) of the non-regenerative ion exchange resin  25  and the compact resin column, and the breakthrough time of the non-regenerative ion exchange resin  25  may be predicted. 
     
       
         
           
             
               
                 
                   
                     Particulate 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     breakthrough 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     time 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     of 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     non 
                     ⁢ 
                     
                       - 
                     
                     ⁢ 
                     regenerative 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     ion 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     exchange 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     resin 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     
                       device 
                       ⁢ 
                       
                           
                       
                       [ 
                       days 
                       ] 
                     
                   
                   = 
                   
                     
                       
                         
                           
                             Particulate 
                             ⁢ 
                             
                                 
                             
                             ⁢ 
                             breakthrough 
                             ⁢ 
                             
                                 
                             
                             ⁢ 
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                             ⁢ 
                             
                                 
                             
                             ⁢ 
                             of 
                           
                         
                       
                       
                         
                           
                             
                               small 
                               ⁢ 
                               
                                   
                               
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                                 [ 
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     In the formula, A is a correction coefficient in consideration of the scale and safety according to the scale of the compact resin column, and is generally 1 or less. If the value of A is smaller, it is possible to reduce a risk of particulates leaking from the pure water production device (ultrapure water production device) including the non-regenerative ion exchange resin  25 , and on the other hand, if the value of A is larger, it is possible to effectively use the ion exchange resin. Therefore, the value may be set in consideration of the balance between the two. Specifically, the value may be 0.5 to 0.9, and particularly appropriately set to be within a range of 0.6 to 0.8. 
     Then, in the present embodiment, the particulate breakthrough time of each of the non-regenerative ion exchange resin device  25  in the first compact resin column  35  and the second compact resin column  39  is predicted. For the first compact resin column  35  and the second compact resin column  39 , since one or more of a column diameter, a resin layer height, and a water flow SV differ, the particulate breakthrough times differ, and the predicted breakthrough times of the non-regenerative ion exchange resin device  25  generally differ. Therefore, the average value of the two times may be multiplied by the correction coefficient A or a shorter prediction time may be used in consideration of safety and multiplied by the correction coefficient A. 
     Second Embodiment 
     Next, a method for predicting a particulate breakthrough time of a non-regenerative ion exchange resin device according to a second embodiment of the present invention will be described. 
     While the compact resin column is provided in parallel to the non-regenerative ion exchange resin  25  in the above first embodiment, the present embodiment provides a method in which the compact resin column is provided independently from the non-regenerative ion exchange resin  25  and an acceleration test is performed. 
     In the present embodiment, as the ultrapure water production device, the same device as in the above first embodiment can be applied. In addition, as the non-regenerative ion exchange resin device  25  which is a subject of which the particulate breakthrough time is predicted, the same device as in the above first embodiment can be applied. In addition, as the compact resin column, the same column as in the above first embodiment can be used. 
     &lt;Method for Predicting Particulate Breakthrough Time&gt; 
     The method for predicting a particulate breakthrough time of the non-regenerative ion exchange device  25  according to the second embodiment will be described. 
     (Water Flow Method and Water Flow Conditions) 
     First, the number of particulates in water W 3  to be treated that flows into the non-regenerative ion exchange resin device  25  is measured in advance. Then, simulated water W 6  to be treated containing a larger number of particulates than the number of particulates is prepared. For example, water containing particulates about several tens to several hundred times the number of particulates in water supply W 3  in the non-regenerative ion exchange resin  25  is prepared, and thus it is possible to estimate the particulate breakthrough time in a short time in an accelerated manner. 
     Specifically, as shown in  FIG. 3 , simulated water W 6  to be treated flows from a supply flow path  51  through a first path  52  including a first particle counter  54  and a second path  53  including a compact resin column  55 , a second particle counter  56 , a flow rate regulating valve  57  and a flow meter  58 , and the number of particulates in treated water (outflow water) W 7  in the compact resin column  55  is measured with the second particle counter  56 . In this case, preferably, simulated water W 6  to be treated flows through the compact resin column  55  with a water flow SV that is 1 to 10 times the water flow SV in the non-regenerative ion exchange resin device  25 . If the water flow SV is too small, a time taken for particulates to breakthrough becomes too long, and it takes a long time to predict the particulate breakthrough time of the non-regenerative ion exchange resin device. On the other hand, when the water flow SV is too large, particulate breakthrough occurs due to a short-term water flow, and thus the prediction accuracy of the particulate breakthrough time deteriorates. The flow meter  58  measures a water flow rate of the compact resin column  55 , and the SV may be measured based on the resin filling volume in the compact resin column  55 . Then, the flow rate regulating valve  57  may adjust the flow rate of the compact resin column  55  so that a desired SV is obtained. However, it is desirable to set the water flow SV or the like so that the number of particulates to be processed in the compact resin column  55  is about 10 particulates/ml or less. Here, the water flow LV is not particularly limited, but it is preferable that the water flows LV in the compact resin column  55  and the non-regenerative ion exchange resin device  25  be the same. 
     When the simulated water W 6  to be treated continuously flows, since the compact resin column  55  has a smaller resin filling amount than the non-regenerative ion exchange resin device  25  and the simulated water W 6  to be treated has more particulates than the water W 3  to be treated, particulate breakthrough occurs in the non-regenerative ion exchange resin device  25  in a very short time. Therefore, when the measured number of particulates in outflow water in the compact resin column  55  exceeds a preset numerical value, it is determined that particulate breakthrough has occurred. Therefore, based on the particulate breakthrough time of the compact resin column  55 , the filling ratio of the ion exchange resin in the compact resin column  55  with respect to the non-regenerative ion exchange resin device  25 , the proportion of the water flow SV, and the ratio between the numbers of particulates in water W 6  to be treated and water W 3  to be treated, it is possible to predict a particulate breakthrough time of the non-regenerative ion exchange resin device  25 . 
     (Prediction of Particulate Breakthrough Time) 
     In the present embodiment, when a time taken for particulates in the compact resin column to breakthrough and a time taken for particulates in the non-regenerative ion exchange resin device to breakthrough are formulated from specifications (the resin layer height, SV, etc.) of the compact resin column, it is possible to predict the particulate breakthrough time in the specifications of the actual non-regenerative ion exchange resin device. For example, based on the time taken for particulates in the compact resin column to breakthrough and the SV, and the ratio relationship between the numbers of particulates in water W 6  to be treated and water W 3  to be treated, formulation is performed by appropriate correction, the particulate breakthrough time of the non-regenerative ion exchange resin device  25  is calculated in consideration of safety, and this time may be used as a time for replacing and maintaining the non-regenerative ion exchange resin device  25 . 
     Specifically, in the following Formula 2, correction is performed in consideration of the safety ratio according to scale-up (a column diameter, a fluid flow, etc.) of the non-regenerative ion exchange resin  25  and the compact resin column, and the ratio between the numbers of particulates in water W 6  to be treated and water W 3  to be treated, and the breakthrough time of the non-regenerative ion exchange resin  25  may be predicted. 
     
       
         
           
             
               
                 
                   
                     Particulate 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     breakthrough 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     time 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     of 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     non 
                     ⁢ 
                     
                       - 
                     
                     ⁢ 
                     regenerative 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     ion 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     exchange 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     resin 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     
                       device 
                       ⁢ 
                       
                           
                       
                       [ 
                       days 
                       ] 
                     
                   
                   = 
                   
                     Particulate 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     breakthrough 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     time 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     of 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     small 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     
                       column 
                       ⁢ 
                       
                           
                       
                       [ 
                       days 
                       ] 
                     
                     × 
                     A 
                     × 
                     B 
                     × 
                     
                       
                         
                           
                             
                               Number 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               of 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               water 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               supply 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               particulates 
                             
                           
                         
                         
                           
                             
                               in 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               small 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               
                                 column 
                                 ⁢ 
                                 
                                     
                                 
                                 [ 
                                 
                                   number 
                                   ⁢ 
                                   
                                     / 
                                   
                                   ⁢ 
                                   mL 
                                 
                                 ] 
                               
                             
                           
                         
                       
                       
                         
                           
                             
                               Number 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               of 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               supply 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               water 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               particulates 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               of 
                             
                           
                         
                         
                           
                             
                               non 
                               ⁢ 
                               
                                 - 
                               
                               ⁢ 
                               regenerative 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               ion 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               exchange 
                             
                           
                         
                         
                           
                             
                               resin 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               
                                 device 
                                 ⁢ 
                                 
                                     
                                 
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                                   number 
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                                   ⁢ 
                                   mL 
                                 
                                 ] 
                               
                             
                           
                         
                       
                     
                     × 
                     
                       
                         Water 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         flow 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         SV 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         in 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         small 
                         ⁢ 
                         
                             
                         
                         ⁢ 
                         column 
                       
                       
                         
                           
                             
                               Water 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               flow 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               SV 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               in 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               non 
                               ⁢ 
                               
                                 - 
                               
                               ⁢ 
                               regenerative 
                             
                           
                         
                         
                           
                             
                               ion 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               exchange 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               resin 
                               ⁢ 
                               
                                   
                               
                               ⁢ 
                               device 
                             
                           
                         
                       
                     
                   
                 
               
               
                 
                   [ 
                   
                     Math 
                     . 
                     
                         
                     
                     ⁢ 
                     2 
                   
                   ] 
                 
               
             
           
         
       
     
     In the formula, A is a correction coefficient in consideration of the scale and safety according to the scale of the compact resin column, and is generally 1 or less. If the value of A is smaller, it is possible to reduce a risk of particulates leaking from the pure water production device (ultrapure water production device) including the non-regenerative ion exchange resin  25 , and on the other hand, if the value of A is larger, it is possible to effectively use the ion exchange resin. Therefore, the value may be set in consideration of the balance between the two. Specifically, the value may be 0.5 to 0.9, and particularly appropriately set to be within a range of 0.6 to 0.8. In addition, B is a correction coefficient in consideration of the safety ratio according to an acceleration test in which the number of water supply particulates is changed, and is generally 1 or less. If the value of B is smaller, it is possible to reduce a risk of particulates leaking from the pure water production device (ultrapure water production device) including the non-regenerative ion exchange resin  25 , and on the other hand, if the value of B is larger, it is possible to effectively use the ion exchange resin. Therefore, the value may be set in consideration of the balance between the two. Specifically, the value may be 0.5 to 0.9, and particularly appropriately set to be within a range of 0.6 to 0.8. 
     While the present invention has been described above based on the above embodiments, the present invention is not limited to the above embodiments, and various modifications can be implemented. For example, in the first embodiment, a plurality of compact resin columns including the first compact resin column  35  and the second compact resin column  38  are provided, one compact resin column may be provided or three or more compact resin columns may be provided in parallel. In addition, in order to accurately estimate the particulate breakthrough time of the non-regenerative ion exchange resin, it is possible to use a particulate breakthrough prediction simulator or the like. 
     EXAMPLES 
     Example 1 
     In the ultrapure water production device shown in  FIG. 1 , an acceleration test was performed using one compact resin column in order to predict the breakthrough time of the non-regenerative ion exchange resin  25 . 
     &lt;Non-Regenerative Ion Exchange Resin  25 &gt; 
     Column diameter: 800 mm 
     Resin layer height: 1,000 mm 
     Water flow SV: 39/h 
     Water flow LV: 39 m/h 
     Number of particulates in water to be treated (water supply): about 100 particulates/mL (&gt;0.05 μm) 
     &lt;Compact Resin Column&gt; 
     Column diameter: 40 mm 
     Resin layer height: 500 mm 
     Water flow SV: 78/h 
     Water flow LV: 39 m/h 
     Number of particulates in simulated water to be treated: about 3,000 particulates/mL (&gt;0.05 μm) 
       FIG. 4  shows the results obtained by causing simulated water to be treated to flow in the compact resin column and continuously measuring the number of particulates in the treated water in the compact resin column. Here, when the number of particulates in the treated water was 1% or more of the simulated water to be treated (about 30 particulates/mL (&gt;0.05 μm), if this time was used as a particulate breakthrough point of the compact resin column, as can be clearly understood from  FIG. 4 , the number of initial particulates was 10 particulates/mL, but exceeded 30 particulates/mL after about 50 days, and thus the 50 th  day was used as the breakthrough point. 
     Therefore, in the above Formula 2, when the correction coefficients A=0.7 and B=0.7 were set in consideration of the degree of safety, and the particulate breakthrough prediction time of the non-regenerative ion exchange device  25  was calculated, the following was calculated: 
       50 [days]×0.7×0.7×(3,000 [particulates/mL]/100 [particulates/mL])×(78[1/h]/39[1/h])=1,470 [days].
 
     Thereby, it can be determined that the non-regenerative ion exchange resin device  25  may be replaced and maintained about 1,500 days after water flow starts as a guide. 
     REFERENCE SIGNS LIST 
     
         
         
           
               25  Non-regenerative ion exchange device 
               31  First path 
               32  Second path 
               33  Third path 
               34  First particle counter 
               35  First compact resin column 
               36  Second particle counter 
               37  Flow rate regulating valve 
               38  First flow meter 
               39  Second compact resin column 
               40  Third particle counter 
               41  Flow rate regulating valve 
               42  Second flow meter 
               51  Supply flow path 
               52  First path 
               53  Second path 
               54  First particle counter 
               55  Compact resin column 
               56  Second particle counter 
               57  Flow rate regulating valve 
               58  Flow meter 
             W Raw water 
             W 0  Pretreated water 
             W 1  Primary pure water 
             W 2  Ultrapure water 
             W 3  Water to be treated 
             W 4  Treated water (outflow water) in first compact resin column  35   
             W 5  Treated water (outflow water) in second compact resin column  39   
             W 6  Simulated water to be treated 
             W 7  Treated water (outflow water) in compact resin column  55