JP6221843B2 - Treated water production equipment - Google Patents

Description

  The present invention relates to a treated water production apparatus including an ion exchange device including an ion exchange tower in which a cation exchange resin and an anion exchange resin are accommodated.

  Conventionally, a treated water production apparatus comprising an ion exchange device having a cation exchange resin and an anion exchange resin and a silica meter for measuring the silica concentration of treated water produced by the ion exchange device has been known. (See Patent Document 1). In such a treated water production apparatus, the silica concentration of the treated water is measured with a silica meter, and the necessity of regeneration of the ion exchange device is determined based on the measured silica concentration.

  Also, a treated water production apparatus comprising an ion exchange device having an anion exchanger and a carbonic acid concentration measuring meter for measuring the carbonic acid concentration of treated water produced by this ion exchange device is known (Patent Document). 2). In this treated water production apparatus, the carbonate concentration of the treated water is measured with a carbonate concentration meter, and the necessity of regeneration of the ion exchange device is determined based on the measured carbonate concentration.

JP-A-8-24852 JP 2013-208566 A

  The ion exchange resin in the ion exchange device has a reduced ion exchange capacity (exchange capacity) as the treated water is produced. The ion exchange resin having reduced ion exchange capacity is reversibly returned to a state having the original ion exchange capacity by being appropriately regenerated.

  However, an ion exchange resin having a reduced ion exchange capacity may not be properly regenerated and may not be returned to a state having an original ion exchange capacity as a result of defective regeneration. In addition, ion exchange resins may deteriorate over time due to factors other than defective regeneration, and the base value of ion exchange capacity (exchange capacity immediately after regeneration) may irreversibly decrease. In particular, anion exchange resins are more likely to deteriorate over time due to factors other than defective regeneration, compared to cation exchange resins.

  The main causes of aging deterioration of anion exchange resins are, for example, oxidative decomposition of ion exchange groups due to the presence of an oxidizing agent such as residual chlorine, thermal decomposition of ion exchange groups by contact with a high-temperature fluid, water flow-regeneration cycle There are wear and crushing loss due to repeated. Even if the anion exchange resin deteriorated over time due to such factors is appropriately regenerated, the base value of the ion exchange capacity does not return to the original state.

  Anion exchange resins whose base value of ion exchange capacity has fallen to an unacceptable level need to be replaced early, but the base value of ion exchange capacity is apparently reduced even when regeneration is poor. In general, it is difficult to distinguish and judge aged deterioration and reproduction failure. However, in the maintenance of the ion exchange device, if it can be judged by distinguishing between the aging deterioration of the anion exchange resin (irreversible decrease in ion exchange capacity) and the regeneration failure (reduction in reversible ion exchange capacity), Useful.

  An object of the present invention is to provide a treated water production apparatus that can distinguish and determine whether the decrease in ion exchange capacity of an anion exchange resin is due to deterioration over time or due to poor regeneration with a simple configuration. .

  The present invention comprises an ion exchange tower that contains a cation exchange resin and an anion exchange resin, and produces treated water by introducing raw water, and treated water produced by the ion exchange apparatus. A first measurement unit that measures electrical conductivity or specific resistance, a second measurement unit that measures the silica concentration of treated water produced by the ion exchange device, and controls the first measurement unit and the second measurement unit. A control unit that controls the first measurement unit to measure electric conductivity or specific resistance, and the electric conductivity or specific resistance measured by the first measurement unit is predetermined. If it is determined that the value is outside the range, the second measurement unit is controlled to measure the silica concentration, and if it is determined that the silica concentration measured by the second measurement unit is outside the predetermined range, abnormal First control for outputting a notification preparation signal About treated water production apparatus for performing.

  Also, a water treatment mode for producing treated water by introducing raw water into the ion exchange device, and a regeneration mode for regenerating the anion exchange resin and the cation exchange resin by introducing a regeneration solution into the ion exchange tower. And when the distribution means is in the water treatment mode, the control unit performs the first control, and the second measurement unit measures the silica concentration, and then the distribution means. 2nd control which controls the distribution means to shift to the regeneration mode, and when the distribution means is in the regeneration mode, the distribution means enters the water treatment mode based on a predetermined transition condition. It is preferable to perform a third control for controlling the distribution means so as to shift.

  In addition, the control unit repeats the first control, the second control, and the third control so that the distribution unit alternately repeats the water treatment mode and the regeneration mode. It is preferable that the first abnormality notification signal is output when the control is performed and the abnormality notification preparation signal is continuously output a predetermined number of times.

  Further, it is preferable that the control unit outputs a second abnormality notification signal when the output of the abnormality notification preparation signal is interrupted before reaching the predetermined number of times.

  ADVANTAGE OF THE INVENTION According to this invention, the treated water manufacturing apparatus which can distinguish and judge whether the fall of the ion exchange capability of an anion exchange resin is a thing by aged deterioration or a reproduction defect with a simple structure can be provided.

It is a schematic block diagram of the treated water manufacturing apparatus 1 which concerns on one Embodiment of this invention. It is a flowchart which shows the first half of operation | movement of the treated water manufacturing apparatus. It is a flowchart which shows the second half of operation | movement of the treated water manufacturing apparatus. 1 is a diagram illustrating an overall configuration of a silica concentration sensor 15. FIG. When the silica concentration of the test water W101 is 0 mgSiO ₂ / L (distilled water), 0.1 mgSiO ₂ / L, and 0.2 mgSiO ₂ / L, the elapsed time from the start of reagent addition and the absorbance of the test water W101 It is a graph which shows a relationship.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram illustrating a treated water production apparatus 1 according to an embodiment of the present invention.

  As shown in FIG. 1, the treated water production apparatus 1 of this embodiment includes an ion exchange device 11, a flow means 12 including a first flow path switching valve 12A and a second flow path switching valve 12B, and a cation exchange resin. A regenerating liquid tank 13 comprising a regenerating liquid tank 13A and a regenerating liquid tank 13B for anion exchange resin, an electric conductivity meter 14 as a first measuring unit, a silica concentration sensor 15 as a second measuring unit, and a control unit 16. The ion exchange device 11 in the present embodiment is a so-called mixed bed type ion exchange device.

  The treated water production apparatus 1 includes a raw water supply line L11, a treated water line L13, a regenerated liquid supply line L14 for cation exchange resin, a regenerated liquid supply line L16 for anion exchange resin, and a regenerated liquid discharge line line. L17. The “line” is a general term for a line capable of fluid flow such as a flow path, a path, and a pipeline.

  The raw water W11 flows through the raw water supply line L11. The downstream end of the raw water supply line L11 is connected to the second flow path switching valve 12B. The upstream end of the raw water supply line L11 is connected to a raw water supply unit (not shown).

  The treated water W13 (pure water, demineralized water) discharged from the ion exchange device 11 via the second flow path switching valve 12B flows through the treated water line L13. The upstream end of the treated water line L13 is connected to the first flow path switching valve 12A, and the downstream end of the treated water line L13 is connected to, for example, a demand point (not shown) of the treated water W13.

  The regenerated liquid W14 for cation exchange resin flows through the regenerated liquid supply line L14 for cation exchange resin. The upstream end of the cation exchange resin regeneration liquid supply line L14 is connected to the cation exchange resin regeneration liquid tank 13A, and the downstream end of the cation exchange resin regeneration liquid supply line L14 is the first flow. It is connected to the path switching valve 12A.

  The anion exchange resin regeneration liquid W16 flows through the anion exchange resin regeneration liquid supply line L16. The upstream end of the anion exchange resin regeneration liquid supply line L16 is connected to the anion exchange resin regeneration liquid tank 13B, and the downstream end of the anion exchange resin regeneration liquid supply line L16 is the second flow. It is connected to the path switching valve 12B.

  In the regenerated liquid discharge line L17, the waste liquid W15 after being used for regenerating the cation exchange resin and the waste liquid W17 after being used for regenerating the anion exchange resin circulate. The upstream end of the regenerated liquid discharge line L17 is connected to a collector (not shown) built in the ion exchange tower. The downstream end of the regeneration liquid discharge line L17 is connected to a regeneration liquid discharge section (not shown).

The electric conductivity meter 14 is connected to the treated water line L13 at the connection portion J1. The silica concentration sensor 15 is connected to the treated water line L13 at the connection portion J2. The connection part J2 is located downstream of the connection part J1.
The controller 16 is electrically connected to the first flow path switching valve 12 </ b> A, the second flow path switching valve 12 </ b> B, the electrical conductivity meter 14, and the silica concentration sensor 15. In FIG. 1, the path of electrical connection is indicated by a broken line.

  The ion exchange device 11 is composed of an ion exchange tower that contains a cation exchange resin (not shown) and an anion exchange resin (not shown) in a mixed state (that is, a mixed bed state). When the raw water W11 is introduced into the ion exchange device 11 via the raw water supply line L11, the ion exchange device 11 removes cations and anions from the introduced raw water W11, and removes cations and anions from the raw water W11. The removed water is circulated through the treated water line L13 as treated water W13 (pure water, demineralized water).

  When the regenerated liquid W14 for cation exchange resin is introduced into the ion exchange device 11 via the regenerated liquid supply line L14 for cation exchange resin, the cation exchange resin is regenerated. When the anion exchange resin regeneration liquid W16 is introduced into the ion exchange device 11 through the anion exchange resin regeneration liquid supply line L16, the anion exchange resin is regenerated.

  In the ion exchange device 11, the cation exchange resin and the anion exchange resin exist in a mixed state. Therefore, before the cation exchange resin and the anion exchange resin are regenerated, operations such as specific gravity separation are performed, and the mixed cation exchange resin and the anion exchange resin are placed on the lower layer side in the ion exchange column. The cation exchange resin and the anion exchange resin on the upper layer side are separated. The mixed cation exchange resin and anion exchange resin are separated and then regenerated.

  The ion exchange column is designed so that, when the cation removal capability is lost (ie, the cation adsorption amount is saturated), the anion removal capability is not yet lost (ie, the anion adsorption amount is saturated). That is, the anion removal capability of the ion exchange column is designed to have a margin compared to the cation removal capability. As described above, anion exchange resins are more likely to deteriorate over time than cation exchange resins. Therefore, for example, the amount of the anion exchange resin in the ion exchange tower is larger than the amount of the cation exchange resin.

In the cation exchange resin regeneration solution tank 13A, for example, an inorganic acid such as hydrochloric acid or sulfuric acid is stored as a regeneration solution for the cation exchange resin of the ion exchange tower.
In the anion exchange resin regeneration solution tank 13B, an alkali solution such as an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution is stored as an anion exchange resin regeneration solution for the ion exchange tower.

12 A of 1st flow-path switching valves are the ion exchange apparatus 11 via the flow path which distribute | circulates the treated water W13 discharged | emitted from the ion exchange apparatus 11 to the treated water line L13, and the regenerated liquid supply line L14 for cation exchange resins. The cation exchange resin regeneration liquid W14 is introduced into the flow path, and the flow path for regenerating the cation exchange resin of the ion exchange device 11 can be switched.
The second flow path switching valve 12B is connected to the ion exchange apparatus 11 via the raw water supply line L11 and the flow path for introducing the raw water W11 into the ion exchange apparatus 11 and the regenerated liquid supply line L16 for anion exchange resin. It is a valve capable of switching between a flow path for introducing the regenerated liquid W16 for anion exchange resin and regenerating the anion exchange resin of the ion exchange device 11.

  The first flow path switching valve 12A and the second flow path switching valve 12B include a water treatment mode for producing the treated water W13 by introducing the raw water W11 into the ion exchange device 11, and a cation exchange resin for the ion exchange device 11. It functions as a distribution means having a regeneration mode for regenerating the cation exchange resin and the anion exchange resin by introducing the regeneration liquid W14 and the regeneration liquid W16 for the anion exchange resin.

The electrical conductivity meter 14 is a measuring instrument that measures the electrical conductivity of the treated water W13 flowing through the treated water line L13 and outputs the measured electrical conductivity value E1 to the control unit 16.
The silica concentration sensor 15 is a measuring instrument that measures the silica concentration of the treated water W13 flowing through the treated water line L13 and outputs the measured silica concentration value F1 to the control unit 16. A specific configuration of the silica concentration sensor 15 will be described later with reference to FIGS. 4 and 5.

  The control unit 16 controls the electrical conductivity meter 14, the silica concentration sensor 15, the first flow path switching valve 12A, and the second flow path switching valve 12B. Based on the electrical conductivity value E1 output from the electrical conductivity meter 14 and the silica concentration value F1 output from the silica concentration sensor 15, the control unit 16 prepares for an abnormality notification preparation signal (notification of an abnormality). Flag signal to be used), a first abnormality notification signal (a signal for reporting an irreversible decrease in ion exchange capacity due to deterioration over time), or a second abnormality notification signal (a signal for a reversible decrease in ion exchange capacity due to regeneration failure) Output signal). Moreover, the control part 16 has a counter (not shown). The initial value of the counter value is zero. The controller 16 increments the counter value by 1 when the abnormality notification preparation signal is output, and resets the counter value to 0 when the second abnormality notification signal is output. (Specific control will be described later with reference to FIGS. 2 and 3).

Next, operation | movement of the treated water manufacturing apparatus 1 of one Embodiment is demonstrated, referring the flowchart of FIG.2 and FIG.3. FIG. 2 is a flowchart showing the first half of the operation of the treated water production apparatus 1. FIG. 3 is a flowchart showing the second half of the operation of the treated water production apparatus 1.
As shown in FIG. 2, in step ST101, the control unit 16 operates the first flow path switching valve 12A and the second flow path switching valve 12B in the water treatment mode. The raw water W11 is introduced into the ion exchange device 11 through the raw water supply line L11 and the second flow path switching valve 12B. The introduced raw water W11 has its cations and anions removed by the cation exchange resin and the anion exchange resin accommodated in the ion exchange tower in a mixed state, and the treated water passes through the first flow path switching valve 12A. The treated water line L13 is circulated as W13 (pure water, demineralized water).

  In step ST102, the control unit 16 acquires the electrical conductivity value E1 from the electrical conductivity meter 14. Specifically, the control unit 16 controls the electrical conductivity meter 14 so as to measure the electrical conductivity of the treated water W13 flowing through the treated water line L13 at a predetermined time interval. The control unit 16 acquires the electrical conductivity value E1 output from the electrical conductivity meter 14.

  In step ST103, the control unit 16 compares the electric conductivity value E1 with a predetermined electric conductivity value E0 set and held in advance. If the control unit 16 determines that E1> E0, the process proceeds to step ST104. In step ST103, when the control unit 16 determines that E1> E0 is not satisfied, the process returns to step ST102 and continues the operation in the water treatment mode. The predetermined electric conductivity value E0 is a value of electric conductivity corresponding to the maximum amount of dissolved ions allowed in the treated water W13. The predetermined electric conductivity value E0 is determined according to the required quality of the treated water W13 at the demand location, and is set to 1 μS / cm, for example.

  In step ST <b> 104, the control unit 16 acquires the silica concentration value F <b> 1 from the silica concentration sensor 15. Specifically, the control unit 16 controls the silica concentration sensor 15 to measure the silica concentration of the treated water W13 flowing through the treated water line L13. The control unit 16 acquires the silica concentration value F <b> 1 output from the silica concentration sensor 15. Thereafter, the process proceeds to step ST105 shown in FIG.

As shown in FIG. 3, in step ST105, the control unit 16 compares the silica concentration value F1 with a predetermined silica concentration value F0 that is set and held in advance. When the control unit 16 determines that F1> F0, the process proceeds to step ST106. In Step 105, when the control unit 16 determines that F1> F0 is not satisfied, the process proceeds to Step ST112. The predetermined silica concentration value F0 is an allowable silica concentration value in the treated water W13. The value F0 of the predetermined silica concentration is determined according to the required quality of the treated water W13 at the demand location, and is set to 0.5 mgSiO ₂ / L, for example.

In step ST106, the control unit 16 outputs an abnormality notification preparation signal (flag signal).
In step ST107, the control unit 16 receives the output of the flag signal in step ST106 and increments the counter value by one.
In step ST108, the control unit 16 compares the value of the counter with a predetermined number of times (for example, three times) set and held in advance. When the control unit 16 determines that the counter value ≧ 3, the process proceeds to step ST109. If the control unit 16 determines that the counter value is not ≧ 3, the process proceeds to step ST110. Note that the value of the predetermined number of times predicts the upper limit number of times (for example, two times) at which regeneration failure can occur continuously in view of the management state of the treated water production apparatus 1 (for example, the management state related to replenishment of the regenerated liquid). Then, a numerical value exceeding the number of times (for example, 3 times) is set.

In step ST109, the control unit 16 outputs a first abnormality notification signal. As described above, the first abnormality notification signal is a signal for notifying an irreversible decrease in ion exchange capacity due to deterioration over time.
In step ST110, the control unit 16 operates the first flow path switching valve 12A and the second flow path switching valve 12B in the regeneration mode. At this time, the mixed cation exchange resin and anion exchange resin are subjected to operations such as specific gravity separation in an ion exchange column. As a result, the mixed cation exchange resin and anion exchange resin are separated into a lower cation exchange resin and an upper anion exchange resin in the ion exchange column. Thereafter, the cation exchange resin regeneration fluid W14 is introduced into the ion exchange device 11 from below via the cation exchange resin regeneration fluid supply line L14 and the first flow path switching valve 12A. The regenerated liquid W16 for anion exchange resin is introduced into the ion exchange device 11 from above through the regenerated liquid supply line L16 for anion exchange resin and the second flow path switching valve 12B.

  In step ST111, the control unit 16 determines whether or not a predetermined transition condition is satisfied, for example, whether or not a series of regeneration operations including a regeneration process, an extrusion process, and a rinse process are completed. When the control unit 16 determines that the predetermined transition condition is not satisfied, the process returns to step ST111 and continues the operation in the reproduction mode. The cation exchange resin and the anion exchange resin of the ion exchange device 11 are regenerated and returned to the original ion exchange capacity until a predetermined transfer condition is satisfied.

  If the control unit 16 determines that the predetermined transition condition is satisfied, the process returns to step ST101 and starts the operation in the water treatment mode again. At this time, the anion exchange resin and the cation exchange resin separated in the upper and lower directions are mixed by air or the like in the ion exchange tower. As a result, the anion exchange resin and the cation exchange resin that have been separated vertically are returned to the mixed cation exchange resin and anion exchange resin.

  The steps after step ST112 (step ST105: NO determination) will be described. In step ST112, the control unit 16 determines whether or not the counter value is zero. When the control unit 16 determines that the counter value = 0, the process proceeds to step ST110. When the control unit 16 determines that the counter value is not 0, the process proceeds to step ST113.

In step ST113, the control unit 16 outputs a second abnormality notification signal. As described above, the second abnormality notification signal is a signal for notifying a reversible decrease in ion exchange capacity due to poor reproduction.
In step ST114, the control unit 16 resets the value of the counter to 0. Thereafter, the process proceeds to step ST110. The processing after step ST110 is as described above.

  In step ST103, the reason why the control unit 16 compares the electric conductivity value E1 with the predetermined electric conductivity value E0 set and held in advance is as follows. When E1> E0, the amount of dissolved ions contained in the treated water W13 exceeds an allowable amount, and the required quality of the treated water W13 at the demand point is not satisfied. That is, the ion exchange device 11 has not sufficiently removed dissolved ions, and the production capacity of the treated water W13 has been lost. Therefore, it is necessary to regenerate the cation exchange resin and the anion exchange resin of the ion exchange device 11. Therefore, the process of step ST103 is performed to determine whether or not a regeneration process is necessary for the cation exchange resin and the anion exchange resin.

  In Step ST105, the reason why the control unit 16 compares the silica concentration value F1 with the predetermined silica concentration value F0 that is set and held in advance is as follows. As described above, the ion exchange column does not yet lose the anion removal capability (that is, the anion adsorption amount is saturated) when the cation removal capability is lost (that is, the cation adsorption amount is saturated). Designed. Therefore, even if E1> E0, if the anion exchange resin is not defectively regenerated or deteriorated over time, the silica concentration value F1 is equal to or less than the predetermined silica concentration value F0. However, in an anion exchange resin, the base value of ion exchange capacity (exchange capacity immediately after regeneration) may be lower than at the time of design. This is because an anion exchange resin may cause an irreversible decrease in ion exchange capacity due to deterioration over time, and may cause a reversible decrease in ion exchange capacity due to poor regeneration. Therefore, the process of step ST105 is performed to determine whether or not the base value of the ion exchange capacity of the anion exchange resin has decreased.

  In step ST106, the reason why the control unit 16 outputs the abnormality notification preparation signal is as follows. In step ST105, F1> F0 means that the base value of the ion exchange capacity of the anion exchange resin (more specifically, the base value of the silica adsorption capacity) has decreased. However, it may not be appropriate for the control unit 16 to output the first abnormality notification signal only by F1> F0. This is because when the cause of the decrease in the base value is the regeneration failure at the time of the previous regeneration process, the anion exchange resin may be returned to the original base value by the normal regeneration process. Therefore, in step ST106, the control unit 16 outputs an abnormality notification preparation signal (flag signal). In this embodiment, the treated water production apparatus 1 is not determined to be abnormal simply by outputting the abnormality notification preparation signal from the control unit 16.

  The reason why the control unit 16 outputs the first abnormality notification signal in step ST109 when it is determined in step ST108 that the value of the counter ≧ 3 is as follows. If it is determined in step ST108 that the value of the counter is ≧ 3, it is determined in step ST105 that F1> F0 for three consecutive times. In other words, the anion exchange resin whose ion exchange capacity base value (more specifically, the base value of silica adsorption capacity) has decreased despite the regeneration process being performed three times returns to the original base value. It means no. Therefore, it is considered that the anion exchange resin has deteriorated over time due to factors other than regeneration failure. Therefore, in step ST109, the control unit 16 outputs a first abnormality notification signal. When the first abnormality notification signal is output, it can be determined that the anion exchange resin does not return to the original base value even after the regeneration process and needs to be replaced.

  In Step ST112, when it is determined that the counter value is not 0, the reason why the control unit 16 outputs the second abnormality notification signal in Step ST113 is as follows. The fact that the processing has shifted from step ST105 to step ST112 means that the base value of the ion exchange capacity of the anion exchange resin (more specifically, the base value of the silica adsorption capacity) has not decreased. However, if it is determined in step ST112 that the value of the counter is not 0, it means that an abnormality notification preparation signal has been output in the previous step ST106. That is, the ion exchange capacity of the anion exchange resin means that it has returned to the original base value when the previous regeneration process was performed. Therefore, it is considered that the anion exchange resin had a regeneration failure. Therefore, in step ST113, the control unit 16 outputs a second abnormality notification signal. When the second abnormality notification signal is output, it means that there has been a temporary regeneration failure of the anion exchange resin, and the cation exchange resin regeneration fluid supply line L14 or the anion exchange resin regeneration fluid supply line L16. It can be judged that inspection such as clogging is necessary.

  The first abnormality notification signal and the second abnormality notification signal are output to, for example, a liquid crystal panel (not shown) or a notification lamp (not shown). The user of the treated water production apparatus 1 can know the abnormality of the treated water production apparatus 1 by confirming the display on the liquid crystal panel, the lighting of the notification lamp, and the like. The first abnormality notification signal and the second abnormality notification signal may be output to a communication line such as an Internet line or a dedicated line, for example. The maintenance worker of the treated water production apparatus 1 can know the abnormality of the treated water production apparatus 1 via the communication line. Further, the abnormality notification preparation signal may or may not be output to a liquid crystal panel (not shown), a notification lamp (not shown), and a communication line.

  The control unit 16 controls the electric conductivity meter 14 to measure the electric conductivity (ST102), and the electric conductivity value E1 measured by the electric conductivity meter 14 is greater than the predetermined electric conductivity value E0. Is determined to be a large value (ie, a value outside the predetermined range), the silica concentration sensor 15 is controlled so as to measure the silica concentration (ST103, ST104). Thereafter, when the control unit 16 determines that the silica concentration value F1 measured by the silica concentration sensor 15 is larger than the predetermined silica concentration value F0 (that is, a value outside the predetermined range), an abnormality is detected. A notification preparation signal is output (ST105, ST106). When the control unit 16 performs such control (first control), the treated water production apparatus 1 determines whether the decrease in the ion exchange capacity of the anion exchange resin is due to aging or defective regeneration. It is possible to prepare for distinguishing and judging.

  The control unit 16 performs the first control when the first flow path switching valve 12A and the second flow path switching valve 12B are in the water treatment mode. After the silica concentration sensor 15 measures the silica concentration, the control unit 16 performs control (second control) for shifting the first flow path switching valve 12A and the second flow path switching valve 12B to the regeneration mode (ST110). When the first flow path switching valve 12A and the second flow path switching valve 12B are in the regeneration mode, the control unit 16 determines the first flow path switching valve 12A and the second flow path switching valve based on a predetermined transition condition. Control (3rd control) which 12B transfers to water treatment mode is performed (ST111). Therefore, the treated water production apparatus 1 can continue to produce treated water W13 by performing a timely regeneration process while monitoring a decrease in the ion exchange capacity of the anion exchange resin.

  The controller 16 repeatedly performs the first control, the second control, and the third control so that the first flow path switching valve 12A and the second flow path switching valve 12B alternately repeat the water treatment mode and the regeneration mode. When the abnormality notification preparation signal is continuously output a predetermined number of times (for example, three times), the first abnormality notification signal is output (ST109). Therefore, in the treated water production apparatus 1, it can be determined that the anion exchange resin has caused a decrease in ion exchange capacity due to deterioration over time.

  When the output of the abnormality notification preparation signal is interrupted before reaching a predetermined number of times (for example, three times) (ST105, ST112), the control unit 16 outputs a second abnormality notification signal (ST113). Therefore, in the treated water production apparatus 1, it can be determined that the anion exchange resin is causing a decrease in ion exchange capacity due to poor regeneration.

  As described above, in the treated water production apparatus 1, the use of the abnormality notification preparation signal, the first abnormality notification signal, and the second abnormality notification signal causes the decrease in the ion exchange capacity of the ion exchange device 11 to be regenerated. It is possible to distinguish and judge whether it is due to aging deterioration of the anion exchange resin that does not return to its original state or temporary regeneration failure of the anion exchange resin.

  Next, the structure of the silica concentration sensor 15 will be described with reference to FIGS. 4 and 5. The silica concentration sensor 15 is a device that measures the silica concentration of the treated water W13 by the molybdenum yellow method (molybdenum yellow absorptiometry). Here, for convenience of explanation, the treated water W13 measured by the silica concentration sensor 15 will be described as the inspection water W101.

  The silica concentration sensor 15 can measure a low concentration silica concentration and a high concentration silica concentration by switching the measurement wavelength. As shown in FIG. 4, the silica concentration sensor 15 includes a measurement cell 120, a reagent injection unit 130, an optical detection unit 140 that constitutes a part of the absorbance measurement unit, a stirring unit 150, a sensor display unit 160, A sensor control unit 110, a test water introduction line L101, and a test water discharge line L102 are provided.

  The measurement cell 120 is a container that stores the inspection water W101 for measuring the silica concentration. The measurement cell 120 is made of an opaque resin material. The measurement cell 120 has a pair of light transmission windows 121 and 122 formed on the side wall thereof. Transparent plates 121a and 122a are fitted into the light transmission windows 121 and 122, respectively.

  The inspection water introduction line L101 is a line for introducing the inspection water W101 into the measurement cell 120. As shown in FIG. 4, the inspection water introduction line L <b> 101 is connected to the side wall below the light transmission windows 121 and 122 of the measurement cell 120. The inspection water introduction line L101 is a flow path for introducing the inspection water W101 into the measurement cell 120. An electromagnetic valve 123 is provided in the inspection water introduction line L101. The electromagnetic valve 123 is a valve used when collecting the inspection water W101. The opening and closing of the electromagnetic valve 123 is controlled by a drive signal output from the sensor control unit 110. The sensor control unit 110 is controlled by the control unit 16.

  The inspection water discharge line L102 is a line for discharging the inspection water W101 (including the reagent W102) from the measurement cell 120. As shown in FIG. 4, the inspection water discharge line L <b> 102 is connected to the side wall above the light transmission windows 121 and 122 of the measurement cell 120. The inspection water discharge line L102 is a flow path for discharging the inspection water W101 from the measurement cell 120.

  The reagent injection unit 130 is a facility for injecting the reagent W102 into the measurement cell 120. The reagent injection unit 130 holds the reagent W102 therein, and discharges and supplies a desired amount of the reagent W102 into the measurement cell 120. The reagent W102 is mixed with a coloring substance that develops color by reacting with silica contained in the test water W101. In this embodiment, the silica concentration is measured by the molybdenum yellow method, and an aqueous solution containing hexaammonium heptamolybdate and an inorganic acid is used as the reagent. Since the composition of the one-component reagent aqueous solution suitable for this embodiment is disclosed in detail in Japanese Patent No. 5169809 by the applicant of the present application, the detailed description is omitted by citing the patent document.

  The reagent injection unit 130 includes a reagent cartridge 131 and a roller pump mechanism 132. The reagent cartridge 131 is an injection body comprising a reagent pack (not shown) filled with the reagent W102 (the above-described one-component reagent aqueous solution), and an elastic tube having one end connected to the reagent pack and a nozzle at the other end. (Not shown).

  As shown in FIG. 4, the roller pump mechanism 132 is provided above the measurement cell 120. A cartridge insertion port 133 is provided at the upper part of the roller pump mechanism 132. The reagent cartridge 131 is detachably attached to the cartridge insertion port 133.

  The roller pump mechanism 132 includes a roller pump 134. By driving the roller pump 134 and squeezing the elastic tube of the injection body accommodated in the reagent cartridge 131, the reagent W102 in the reagent pack can be injected from the nozzle toward the measurement cell 120. The driving of the roller pump 134 is controlled by a driving signal output from the sensor control unit 110.

  The optical detection unit 140 is a facility for measuring the absorbance of the test water W101 stirred together with the reagent W102. As shown in FIG. 4, the optical detection unit 140 includes a first light emitting element 141, a second light emitting element 142, a light emitting substrate 143, a first light receiving element 144, a second light receiving element 145, and a light receiving substrate 146. .

The first light emitting element 141 and the second light emitting element 142 are mounted on the light emitting substrate 143. The first light emitting element 141 and the second light emitting element 142 are elements that irradiate light toward the light transmission window 121 of the measurement cell 120. The 1st light emitting element 141 and the 2nd light emitting element 142 are comprised by LED (light emitting diode) from which light emission wavelength differs, respectively. In the present embodiment, the first light emitting element 141 is a light emitting element that can emit light having a wavelength of 375 nm (low concentration measurement wavelength) in order to measure a low concentration of silica. The second light emitting element 142 is a light emitting element capable of emitting light having a wavelength of 450 nm (high concentration measurement wavelength) in order to measure a high concentration of silica.
The turning on / off of the first light emitting element 141 and the second light emitting element 142 is controlled by a drive signal output from the sensor control unit 110.

  The first light receiving element 144 and the second light receiving element 145 are mounted on the light receiving substrate 146. The first light receiving element 144 and the second light receiving element 145 are elements that receive the transmitted light that has passed through the light transmitting window 122 of the measurement cell 120. The first light receiving element 144 and the second light receiving element 145 are configured by phototransistors. The first light receiving element 144 and the second light receiving element 145 output a detection value signal corresponding to the received transmitted light amount to the sensor control unit 110.

  The stirring unit 150 is a facility for stirring the test water W101 and the reagent W102 accommodated in the measurement cell 120. As shown in FIG. 4, the stirring unit 150 is provided at the bottom of the measurement cell 120. The stirring unit 150 includes a stirring bar 151 and a stator coil 152. The stirrer 151 is rotatably disposed at the bottom of the measurement cell 120. The stator coil 152 is an electromagnetic induction coil formed in a ring shape so as to surround the periphery of the measurement cell 120. When a drive current is supplied to the stator coil 152, the stirrer 151 disposed at the bottom of the measurement cell 120 rotates in a non-contact manner due to the action of electromagnetic induction. The operation of the stator coil 152 is controlled by a drive current supplied from the sensor control unit 110.

  The sensor display unit 160 is a device that displays the measured value of the silica concentration of the measured inspection water W101, the operation status of the silica concentration sensors SS1 to SS3B, and the like. The sensor display unit 160 is configured by a liquid crystal display panel.

  The sensor control unit 110 is a device that controls the operation of the silica concentration sensor. The sensor control unit 110 is connected to the control unit 16 and controlled by the control unit 16. The sensor control unit 110 controls the first light emitting element 141 and the second light emitting element 142. The sensor control unit 110 receives outputs from the first light receiving element 144 and the second light receiving element 145. The sensor control unit 110 measures the concentration of the silica component contained in the inspection water W101 based on the absorbance detected by the optical detection unit 140. The sensor control unit 110 causes the sensor display unit 160 to display the measured value of the silica concentration of the measured inspection water W101. The sensor control unit 110 stores a later-described calibration curve in an internal memory for each measurement wavelength.

  In order to measure the low-concentration silica concentration, the sensor control unit 110 includes an absorbance calculation unit 111, a change amount calculation unit 112, a timing unit 113, and a silica concentration detection unit 114 that constitute a part of the absorbance measurement unit. Have.

  The absorbance calculation unit 111 calculates the absorbance of the test water W101 at the first time T1 and the second time T2 (see FIG. 5) based on the detected value of the transmitted light amount detected by the optical detection unit 140. Thereby, in this embodiment, the optical detection unit 140 and the absorbance calculation unit 111 measure the absorbance at 375 nm in the test water W101 to which the reagent W102 is added.

  The first time T1 is a time immediately after the reagent W102 is added (see FIG. 5). The first time T1 is preferably within 3 minutes after the reagent W102 is added to the test water W101. The first time T1 is within a range in which the addition of the specified amount of the reagent W102 can be performed, and a time close to immediately after the addition of the specified amount of the reagent W102 is completed. In the present embodiment, the first time T1 is about 2 minutes (see FIG. 5). When the time required for the addition operation of the reagent W102 is extremely short, the first time T1 may be 0 minutes, which is the same as the time when the reagent W102 is added to the test water W101.

  The second time T2 is a reagent reaction end time when the reaction between the test water W101 and the reagent W102 is completed (see FIG. 5). The second time T2 is a time during which the color reaction between the test water W101 and the reagent W102 is almost completed and the coloration of the test water W101 is stabilized. 110 memory (not shown). In the present embodiment, the second time T2 is about 20 minutes after the addition of the reagent W102 is started (see FIG. 5).

  The timer 113 measures the second time T2. At the second time T2 timed by the time measuring unit 113, the absorbance calculation unit 111 calculates the absorbance of the test water W101.

  For the absorbance of the test water W101 to which the reagent W102, which is measured by the optical detection unit 140 and the absorbance calculation unit 111, is added, the change amount calculation unit 112 is the test water W101 after the first time T1 has elapsed since the reagent W102 was added. And the difference A2-A1 between the absorbance A1 and the absorbance A2 of the test water W101 after a second time T2 longer than the first time T1 from the addition of the reagent W102 is calculated.

  The silica concentration detection unit 114 detects the silica concentration based on the change amount (difference) in absorbance calculated by the change amount calculation unit 112. Specifically, the silica concentration detection unit 114 regards the calculated change (difference) in absorbance as the absorbance of the test water W101, and performs an inspection using a calibration curve between the silica concentration and the absorbance for this absorbance. The silica concentration in the water W101 is determined. The calibration curve is created in advance as a relation line between the silica concentration and the absorbance using a silica standard solution, and is stored in a memory (not shown) of the sensor control unit 110. In the present embodiment, a calibration curve created in a state where the color reaction between the test water W101 and the reagent W102 is completed as a calibration curve between the absorbance of the test water W101 and the silica concentration in the memory (not shown). Is remembered.

The silica concentration sensor configured as described above has a high concentration range capable of measuring the silica concentration of high concentration silica (10 to 80 mg SiO ₂ / L) by switching the measurement wavelength, and the silica concentration of low concentration silica. The low concentration range in which (0.1 to ₁ mg SiO ₂ / L) can be measured can be switched.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiment, and can be implemented in various forms.

  In the said embodiment, although the treated water manufacturing apparatus 1 demonstrated as what is called a mixed bed type treated water manufacturing apparatus, it is not limited to this. For example, the treated water production apparatus 1 divides the inside of the ion exchange tower into a cation exchange chamber and an anion exchange chamber, and stores the cation exchange resin in the cation exchange chamber, and the anion exchange resin in the anion exchange chamber. It is good also as a double-floor type treated water manufacturing apparatus which accommodated.

  In the said embodiment, although the electrical conductivity meter 14 was used as a 1st measurement part, a specific resistance meter may be used. When a specific resistance meter is used, in step ST103 of FIG. 2, the control unit 16 obtains a specific resistance value output from the specific resistance meter and a predetermined specific resistance value set and held in advance. Compare. When the control unit 16 determines that the specific resistance value output from the specific resistance meter is smaller than the predetermined specific resistance value (that is, a value outside the predetermined range), the process is performed. The process proceeds to step ST104.

  In the above embodiment, the abnormality notification preparation signal (flag signal) is used to output the first abnormality notification signal and the second abnormality notification signal as in the flowcharts of FIGS. 2 and 3, but the present invention is not limited to this. . In the treated water production apparatus 1, the abnormality notification preparation signal can be used for various purposes for specifying the cause of the decrease in ion exchange capacity. For example, when the abnormality notification preparation signal is output once or a plurality of times, the worker can check the ion exchange device 11 visually.

  In the embodiment described above, after the first abnormality notification signal and the second abnormality notification signal are output as in the flowcharts of FIGS. 2 and 3, the process proceeds to step ST110. However, the present invention is not limited to this. For example, when the first abnormality notification signal or the second abnormality notification signal is output, the operation of the treated water production apparatus 1 can be stopped. In particular, since the first abnormality notification signal means the occurrence of aging of the anion exchange resin, it is desirable to stop the operation of the treated water production apparatus 1 and replace the anion exchange resin.

  In the said embodiment, although the silica concentration sensor 15 was provided in the downstream of the electrical conductivity meter 14 in the treated water line L13, you may provide in the upstream. Further, the silica concentration sensor 15 may not be configured to be able to switch between the high concentration range and the low concentration range.

  In the above embodiment, the silica concentration sensor 15 performs processing when the electrical conductivity value E1 output from the electrical conductivity meter is equal to or higher than the predetermined electrical conductivity value E0 in the first control. Although it was controlled to measure the silica concentration of the water W13, it is not limited to this. In the first control, the silica concentration sensor 15 measures the silica concentration of the treated water W13 when the electrical conductivity value E1 output from the electrical conductivity meter becomes equal to or greater than a predetermined electrical conductivity value E0. For example, it may be controlled to periodically measure the silica concentration of the treated water W13.

  In the above embodiment, in the regeneration mode, only the cation exchange resin regeneration solution is supplied to the lower cation exchange resin, and the upper anion exchange resin is used for the upper anion exchange resin. Only the regenerating solution was supplied, and as a result, the cation exchange resin and the anion exchange resin were regenerated. However, the present invention is not limited to this. First, the cation exchange resin regeneration solution is supplied to the lower cation exchange resin regeneration solution and the upper anion exchange resin, and then the anion exchange resin regeneration solution is supplied only to the upper anion exchange resin. You may be made to do. Even in this way, the cation exchange resin and the anion exchange resin can be regenerated. Further, the configuration of the distribution means can be changed as appropriate depending on the reproducing method.

DESCRIPTION OF SYMBOLS 1 Treated-water production apparatus 11 Ion exchange apparatus 12 Distribution means 14 Electrical conductivity meter (1st measurement part)
15 Silica concentration sensor (second measuring part)
16 Control part W11 Raw water W13 Treated water

Claims (4)

An ion exchange apparatus comprising an ion exchange tower containing a cation exchange resin and an anion exchange resin, and producing treated water by introducing raw water;
A first measurement unit for measuring the electrical conductivity or specific resistance of the treated water produced by the ion exchange device;
A second measuring unit for measuring the silica concentration of the treated water produced by the ion exchange device;
A control unit for controlling the first measurement unit and the second measurement unit;
With
The control unit controls the first measurement unit to measure electric conductivity or specific resistance, and the electric conductivity or specific resistance measured by the first measurement unit is a value outside a predetermined range. When it is determined, the second measurement unit is controlled to measure the silica concentration, and when it is determined that the silica concentration measured by the second measurement unit is out of a predetermined range, an abnormality notification preparation signal is output. Treated water production equipment that performs control. A water treatment mode for producing treated water by introducing raw water into the ion exchange device, and a regeneration mode for regenerating the anion exchange resin and the cation exchange resin by introducing a regeneration solution into the ion exchange tower; A distribution means having
The control unit performs the first control when the distribution unit is in the water treatment mode, and after the second measurement unit measures the silica concentration, the distribution unit shifts to the regeneration mode. Second control is performed to control the flow means, and when the flow means is in the regeneration mode, the flow means is controlled to shift to the water treatment mode based on a predetermined transition condition. The treated water manufacturing apparatus according to claim 1, wherein the third control is performed. The control unit repeatedly performs the first control, the second control, and the third control so that the circulation unit alternately repeats the water treatment mode and the regeneration mode. The treated water production apparatus according to claim 2, wherein the first abnormality notification signal is output when the control is performed and the abnormality notification preparation signal is continuously output a predetermined number of times. The treated water production apparatus according to claim 3, wherein the control unit outputs a second abnormality notification signal when the output of the abnormality notification preparation signal is interrupted before reaching the predetermined number of times.

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