TWI732939B - Operation method of water treatment device - Google Patents

Abstract

A method of operating a water treatment device is a method of operating a water treatment device having a plurality of water treatment devices of the same type and the same treatment capacity arranged side by side, and each water treatment device is supplied with the same treated water and treated Water is collected; it is characterized in that the flow of water to some of the water processors A is higher than that of other water processors B. When the water quality of the treated water of the water processor A deteriorates, according to The cumulative load on the water processor A up to this time predicts the life of the water processor B, and based on this prediction result, controls the amount and time of water flow to each water processor.

Description

Operation method of water treatment device

[0001] The present invention relates to a method for operating a water treatment device in which a plurality of ion exchange resin towers, activated carbon towers and other water treatment devices are arranged in parallel.

[0002] General industrial pure water such as boiler water, highly pure water used in power plants, ultra-pure water used as washing water and flushing water for wafers or substrates in semiconductor factories and liquid crystal factories, etc., are almost A water treatment system that completely removes impurities contained in the water to be treated is manufactured by combining multiple used water treatment systems. As a water processor, ion exchange resin towers, activated carbon towers, RO membrane devices, UF membrane devices, ion exchange filters, etc. are widely used.　　[0003] In addition to repeating the impurity removal step and regeneration step, as the use method of these water treatment devices, there is also a short-term use method of replacing it with a new product at a certain level of use. In either case, it is desirable to be able to maintain the impurity removal step (water flow step) for a long time while maintaining the desired treated water quality.　　[0004] Even when the deterioration tendency of the treated water quality is confirmed, the water treatment device is still often difficult to quickly transfer to regeneration or upgrade to a new product. Therefore, in fact, it is planned to regenerate and update for every certain period or every certain amount of processing. [0005] However, the quality of the water to be treated is not limited to a certain amount in a year. Therefore, in the case of regeneration and renewal for every certain period or every certain amount of treatment, the water quality of the treated water The condition is set based on the severe condition (the concentration of impurities to be removed is high). As a result, regeneration and renewal are usually performed only when there is a certain degree of margin. Moreover, if this is not the case, there is a risk that the desired water quality cannot be ensured. [0006] Patent Document 1 describes a small ion exchange resin packed tower installed in parallel with the ion exchange resin device of an actual machine, and the same raw water (water to be treated) is circulated to this small ion exchange resin packed tower. A method to monitor the quality of the treated water and estimate the residual life of the ion exchange resin device. [Prior Art Document] [Patent Document] 　　[0007] 　　[Patent Document 1] JP 2012-154634 A

[Problem to be solved by the invention] 　　[0008] In the life prediction of a container filled with a small ion exchange resin, generally speaking, the SV, LV, etc. should be as close as possible to the actual machine and set to pass water under slightly severe conditions, which is difficult to be accurate. It reflects the load status of the actual machine, and it is also necessary to take a certain degree of margin into consideration here. [Means to Solve the Problem] 　　[0009] The object of the present invention is to provide a method for operating a water treatment device that operates in a way that the water treatment capacity of the water treatment device is fully utilized to the end. "The gist of the present invention is as follows." [1] A method of operating a water treatment device, which is a method of operating a water treatment device having a plurality of water treatment devices of the same type and the same treatment capacity arranged side by side, and the same treatment water is used for each water treatment device And the treated water is collected; the characteristic is that the water flow to some of the water processor A is higher than that of the other water processor B, and the water quality of the treated water of the water processor A is deteriorated. , Predict the life of the water processor B based on the cumulative load to the water processor A up to that time, and based on this prediction result, control the amount and time of water flow to each water processor. [2] The operating method of the water treatment device as described in [1], wherein until the water quality of the water treatment device deteriorates, the water flow rate for the water treatment device A is set to the water flow rate of the water treatment device B 1.05 to 1.3 times of that. [0011] [3] The method of operating a water treatment device as described in [1] or [2], wherein the cumulative load on the water treatment device A until the water quality of the treated water of the water treatment device A deteriorates to a specific value As the life load, the difference between the cumulative load on the water processor B and the life load (hereinafter referred to as the load difference) up to this point in time is obtained, and the water treatment is applied from this point in time to the end of water extraction. The load of the device B becomes the method of the load difference, and the water passing speed and the water passing time to the water treatment device B after this time point are set. [0012] [4] The method for operating a water treatment device as described in any one of [1] to [3], wherein the water supply to the water treatment device A is stopped after the above time point, and the entire water treatment device per unit time The water flow rate per unit time obtained by dividing the necessary treated water volume by the number of water treatment devices B is set as the water flow rate for each water treatment device B. 　　 This water flow rate is calculated from the above time point and the end of water collection. The load obtained by the product of the water passing time becomes the above-mentioned load difference, and the water passing time is set. [0013] [5] The method for operating a water treatment device according to any one of [1] to [4], wherein the water treatment device includes: a container, an ion exchange resin filled in the container, activated carbon, and ion exchange Filter, and chelating resin or catalyst. [Effects of the invention] 　　[0014] In the present invention, a part (one or a few) of the water treatment device A is used as a test to detect the low quality of the treated water, which is slightly higher than that of other water treatment devices B Water is passed under a load (for example, a high water flow rate), and the life of the water processor is predicted based on the signs of deterioration of the water quality of the treated water of the water processor used in this test. Then, set the subsequent water flow conditions in such a way that each water processor is used to the end of its life.　　[0015] With this, the general water treatment system can maintain the desired water quality without additional installation of special measuring equipment, control equipment, etc., and use each water processor until the end of its life. Even if signs of deterioration of water quality are detected in a part of the water treatment device by the high load, the life of the whole water treatment device will not be reached immediately, so the regeneration and renewal of the water treatment device can be responded to. After the preparation is reached, proceed without difficulty.

[0017] Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1. In addition, in the description of this embodiment, although the water processor is set as an ion exchange resin tower, it can also be an activated carbon tower, a chelating resin tower, a catalyst tower, an ion exchange filter, an MF membrane device, and a UF membrane device. , RO membrane device, etc. Preferable examples include ion exchange resin towers, ion exchange filters, chelating resin towers, activated carbon towers, catalyst towers, etc. with a clear life span. Moreover, in order to produce ultrapure water, in addition to water treatment to remove impurities in the water, and pure water production, it can also be applied to the removal of impurities in the liquid.　　[0018] As shown in Figure 1, a plurality of ion exchange resin towers 3 are arranged in parallel in the water treatment device. Each ion exchange resin tower 3 is provided with a container of the same shape and the same volume, and the same type of ion exchange resin filled in the container in the same amount. To each ion exchange resin tower 3, the water to be treated can be passed through the pipe 1 and the valve 2, and the treated water can flow out through the valve 4 and the pipe 5. The water flow rate of each ion exchange resin tower 3 is measured with a flow meter (not shown), and the water quality of the treated water of each ion exchange resin tower 3 is measured with a water quality measuring device 6. As the water quality measuring device, a conductivity meter, a turbidity meter, a residual chlorine concentration meter, a pH meter, a resistivity meter, etc. can be used, but it is not limited to them. The water quality measuring device suitable for the type of water treatment device can be selected appropriately. [0019] Among the plurality of ion exchange resin towers 3, a part (the one on the leftmost side in Figure 1) A is used as the test tower A, and the tower A is slightly cooler than the other towers B ( In this case, it is a high flow rate condition) to pass water. Furthermore, the water quality of the treated water of the ion exchange resin tower A is continuously or intermittently monitored, and signs of deterioration of the self-stable state are grasped. In addition, the SV of the water passing to the tower A during this period is preferably about 1.05 to 1.3 times the SV of the water passing to the tower B.　　[0020] The SV of water flow for tower A is larger than that for tower B, so tower A has an early failure compared with tower B (deterioration of treated water quality). [0021] After understanding the signs of deterioration of the water quality of the treated water in Tower A before the deterioration of the water quality of the treated water of Tower B, in order to fully utilize the overall capacity of the towers A and B (that is, at the end of their life) , It is to predict the remaining life of tower B to adjust the flow rate, so as to maximize the quality of treated water until the end of water extraction. That is, for the tower A to reduce the water flow rate or stop the water flow, the reduced portion (or the stopped portion) of the water flow for this tower A is added to the water flow for the other tower B. The water flow rate of each tower B can be set equal, or the additional part of the flow rate of one part of tower B (tower C) can be set to be slightly higher than that of other towers B, and the signs of deterioration of the treated water quality of tower C can be monitored And predict the remaining life of the remaining tower B (mark C is not shown in the figure). [0022] With the above method, for a general water treatment system, it is possible to maintain the quality of the treated water for the purpose without additional installation of special measuring equipment or control equipment, and for all ion exchange resin towers to pass water to Life will end. Even if the tower A (or tower C) sees the signs of deterioration of the water quality, the life of the entire water treatment device will not be reached immediately, so the regeneration and renewal of the water treatment device can be carried out without difficulty after the preparation is completed. [0023] In Figure 1, one ion exchange resin tower is set as the test tower A. However, in a system where most towers are arranged in parallel, in order to improve the accuracy of the residual life prediction, a little There are multiple test towers A for passing water under extremely cool conditions, and a difference is given to the severity (the degree of high flow rate) relative to the standard conditions. [Examples] 　　 [0024] An example of the present invention will be described in more detail as follows. [0025] Generally speaking, the life of water treatment functional materials such as ion exchange resins, as long as the flow (SV, etc.) and other water flow conditions are within an appropriate range, is the load, that is, the concentration of impurities in the treated water that is attempted to be removed, It is roughly determined by the product of the cumulative water flow. [0026] As shown in Figure 1, in a water treatment device in which ion exchange resin towers are arranged in parallel with 10 towers, at the beginning of the water flow, one tower A is flowed with water at a flow rate 10% higher than the standard. For the other tower B, water is passed at the flow rate that divides the rest into equal parts. That is, water is passed to Tower A at a water flow rate of 11% of the total water flow per unit time of the water treatment device. For the remaining 9 towers B, the water flow rate is equally divided by 89% of the total water flow per unit time (the water flow rate of the total water flow of the entire water treatment device per unit time is 9.89% of the water flow rate). Water (89/9 = 9.89). [0027] If the water flow time until the time when the water quality of the effluent water of the tower A shows signs of deterioration is 100 days, the cumulative water flow to the tower A up to the 100th day is higher than the standard conditions (the total 10% of the water flow rate is equal to the conditions for water flow to each tower) the cumulative water flow rate is 10% more. Therefore, in the case of passing water to the tower 3 under the standard conditions, the water passing time (lifetime) until the treatment water quality starts to deteriorate can be estimated to be 110 days. [0028] Therefore, after the 100th day, to ensure the total water flow of 1 tower A and the other 9 towers B totaling 10 units, reduce (or stop) the water flow of tower A and increase the water flow of tower B The amount of water flow is set in such a way that both towers A and B are cumulative loads (cumulative loads during the period from the start of water flow to the end of water collection) as the load of 110 days for the standard conditions of water flow. The number of days of the person’s water supply.　　[0029] For example, the water quality requirements of the treated water are strict, and even if the impurity with more than a slight sign is not allowed, the tower A mentioned above is set as the end of the water flow at this stage (the 100th day). For the other 9 towers B, set the water flow rate of 9 equal parts of the water flow per unit time of 10 units under the standard conditions. Specifically, set the water flow rate of 11.1% (100%) to the standard conditions. /9=11.1%).　　[0030] The cumulative load of Tower B at 100 days is 98.9 days when converted to standard conditions, and 11.1 days of residual capacity under standard conditions. Therefore, the water flow rate is increased by 11.1% to become the cumulative load of 11.1 days under this standard condition, and the number of water flow days after the 100th day is set. In this case, it becomes a cumulative load by running water for 10 days later. Therefore, as far as Tower B is concerned, water can be collected until the 110th day.　　[0031] By using the above methods for life prediction and water flow control, the life of each tower A and B can be utilized to the maximum. [0032] In operation, one tower A can also be used for high-velocity water flow increased by 20%, the other tower A can be used for high-velocity water flow increased by 10%, and the remaining 8 towers B can be set equal Water.　　[0033] Tower A is not always the same tower, but can be replaced every specific period. For example, in a water treatment device where three towers a, b, and c are installed side by side, when the standard water flow rate is set to K, in one example, the water flow rate of towers a and b is set to 1.0 K , Set tower c to 1.2 K, when tower c shows signs of deterioration in water quality, set the water flow rate of tower a and b to 1.1 K, set the water flow rate of tower c to 0.8 K, and set each tower a , B, c are used to the end. As another example, the water flow rate of towers a and b can be set to 1.0 K, and the water flow rate of tower c can be set to 1.2 K. When tower c shows signs of deterioration of water quality, the water flow rate of tower a The speed is set to 1.0 K, the water flow rate of tower b is set to 1.2 K, and the water flow rate of tower c is set to 0.8 K, so that tower b has a higher load than tower a, and the treated water quality of tower b is monitored.　　[0034] Although the present invention is described in detail in a specific manner as above, it should be self-evident in the industry that various changes can be made without departing from the intent and scope of the present invention.　　 This application is based on the Japanese Patent Application No. 2017-001990 filed on January 10, 2017, and the entire content can be cited here.

[0035]2,4‧‧‧Valve 3‧‧‧Ion Exchange Resin Tower

[0016] "Figure 1" is a structural diagram of a water treatment device to which the method of the present invention is applied.

1‧‧‧Piping

2, 4‧‧‧Valve

3‧‧‧Ion exchange resin tower

5‧‧‧Piping

6‧‧‧Water Quality Tester

A, B‧‧‧Water processor

Claims (3)

A method of operating a water treatment device is a method of operating a water treatment device having a plurality of water treatment devices of the same type and the same treatment capacity arranged side by side, and each water treatment device is supplied with the same treated water and treated Water is collected; it is characterized in that the flow of water to some of the water processors A is higher than that of other water processors B. When the water quality of the treated water of the water processor A deteriorates, according to To predict the life of water processor B based on the cumulative load on water processor A at that time, and based on this prediction result, control the amount and time of water flow to each water processor to reach water processor A When the water quality of the treated water deteriorates to a specific value, the cumulative load on the water processor A is set as the life load, and the difference between the cumulative load on the water processor B and the life load (hereinafter, This is called the load difference). After the above time point, stop the water flow to the water treatment device A, and divide the necessary treatment water volume per unit time of the entire water treatment device by the number of water treatment devices B to obtain the water flow per unit time, Set the water flow rate to each water treatment processor B, and set the water flow rate so that the load obtained from the product of the water flow rate and the water flow time from the above time point to the end of the water collection becomes the above-mentioned load difference. time. For example, the operation method of the water treatment device in the first item of the scope of patent application, wherein until the water quality of the water treatment device deteriorates, the water flow rate for the water treatment device A is set to 1.05~ the water flow rate of the water treatment device B 1.3 times. For example, the operating method of the water treatment device in the scope of the application for patent 1 or 2, wherein the water treatment device has: a container, an ion exchange resin filled in the container, activated carbon, an ion exchange filter, and a chelating resin or contact Media.

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