JP2016067975A - Water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water treatment system which reduces energy to be consumed.SOLUTION: There is provided a water treatment system which comprises: an ion exchanger 11 having an anion exchange resin; a circulation part 12 having a water treatment mode and a regeneration mode; a circulation control part 17A for controlling the circulation part 12 so as to switch the water treatment mode and the regeneration mode based on a predetermined switch condition; a silica adsorption amount estimation information output part which has a raw water silica concentration measuring part 14 for measuring the silica concentration of raw water W11 and outputs estimation information based on the silica concentration of the raw water W11 measured by the raw water silica concentration measuring part 14, in the water treatment mode; a temperature adjustment part 16 for adjusting the temperature of a regenerated liquid W16 or an anion exchange resin bed; and a regeneration temperature control part 17 for controlling the temperature adjustment part 16 so that the temperature of the regenerated liquid W16 or the anion exchange resin bed is a predetermined temperature in performing the regeneration mode, based on the estimation information output from the silica adsorption amount estimation information output part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water treatment system including an ion exchange device having an anion exchange resin bed.

  2. Description of the Related Art Conventionally, a water treatment system that includes an ion exchange device having an anion exchange resin bed and in which treated water is produced by introducing raw water into the ion exchange device is known. Various raw water (for example, tap water and groundwater) that is the source of industrial water and domestic water usually contains silica (colloidal silica and ionic silica). In such a water treatment system, When treated water is produced from raw water, silica is adsorbed on the anion exchange resin bed. Silica adsorbed on the anion exchange resin bed lowers the ion exchange capacity (exchange capacity) of the ion exchange resin.

  For the regeneration of the anion exchange resin bed, for example, an alkaline solution such as an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution is used, and the silica adsorbed on the anion exchange resin and various anions are desorbed by passing the alkaline solution. The However, if the adsorption amount of silica is large, it is difficult to sufficiently recover the ion exchange capacity.

  Therefore, a technique for regenerating an anion exchange resin bed using a warmed regenerated liquid in a water treatment system is known (see Patent Document 1). Also, a technique for regenerating an anion exchange resin bed after heating the anion exchange resin bed in a water treatment system is known (see Patent Document 2).

JP 2003-80245 A JP 10-337485 A

  When regenerating the anion exchange resin bed, the silica adsorbed on the anion exchange resin is efficiently desorbed and the ion exchange capacity is fully recovered by heating the regeneration solution and the anion exchange resin bed. It becomes possible to make it.

  However, energy is consumed when heating the regenerated liquid or the anion exchange resin bed. Further, when the amount of silica adsorbed on the anion exchange resin is small, it is not always necessary to heat the regenerated solution or the anion exchange resin bed. If the regeneration solution or the anion exchange resin bed does not need to be heated, unnecessary energy is consumed if the regeneration solution or the anion exchange resin bed is heated.

  An object of this invention is to provide the water treatment system which can suppress the energy consumed in a water treatment system provided with the ion exchange apparatus which has an anion exchange resin bed.

  The present invention includes an ion exchange apparatus having an anion exchange resin, a water treatment mode for producing treated water by introducing raw water into the ion exchange apparatus, and the anion exchange apparatus by introducing a regenerated liquid into the ion exchange apparatus. A distribution means for regenerating the ion exchange resin, a distribution control means for controlling the distribution means to switch between the water treatment mode and the regeneration mode based on a predetermined transition condition, and silica of raw water A raw water silica concentration measuring unit for measuring the concentration, in the water treatment mode, estimation information for estimating the silica adsorption amount of the anion exchange resin bed, the raw water silica concentration measuring unit measured A silica adsorption amount estimation information output unit that outputs estimation information based on the silica concentration of raw water, and a temperature for adjusting the temperature of the regenerated liquid or the anion exchange resin bed Based on the estimation information output from the adjustment unit and the silica adsorption amount estimation information output unit, the temperature of the regeneration solution or the anion exchange resin bed becomes a predetermined temperature when the regeneration mode is executed. The present invention relates to a water treatment system including a regeneration temperature control unit that controls the temperature adjustment unit.

  The regeneration temperature control unit may control the regeneration solution or the anion exchange resin bed to have a first temperature when the silica concentration measured by the raw water silica concentration measurement unit is equal to or lower than a reference raw water silica concentration. When the silica concentration calculated by the raw water silica concentration measuring unit is greater than the reference raw water silica concentration by controlling the temperature adjusting unit, the temperature of the regenerated liquid or the anion exchange resin bed is higher than the first temperature. It is preferable to control the temperature adjusting unit so that the second temperature is high.

  The silica adsorption amount estimation information output unit includes a raw water electrical conductivity measurement unit that measures the electrical conductivity of the raw water and a raw water silica ratio calculation unit that calculates the silica ratio of the raw water. The ratio is [raw water silica concentration / (raw water silica concentration + raw water electrical conductivity / 2 × conversion coefficient)] (however, raw water silica concentration: raw water silica concentration measured by the raw water silica concentration measuring unit, raw water electrical conductivity: Calculated by the raw water electrical conductivity measured by the raw water electrical conductivity measurement unit, conversion coefficient: predetermined constant), the estimation information includes the silica ratio of the raw water, and the regeneration temperature control unit includes the raw water silica. When the silica ratio measured by the ratio calculation unit is equal to or less than the reference raw water silica ratio, the temperature adjusting unit is controlled so that the temperature of the regenerated liquid or the anion exchange resin bed becomes the first temperature, and the raw water system When the silica ratio measured by the liquid ratio calculator is larger than the reference raw water silica ratio, the temperature of the regenerated solution or the anion exchange resin bed is set to a second temperature higher than the first temperature. It is preferable to control the adjustment unit.

  A treated water electrical conductivity measuring unit for measuring the electrical conductivity of the treated water is provided, and the silica adsorption amount estimation information output unit includes a raw water flow rate measuring unit for measuring the raw water flow rate, and an integrated silica inflow calculating amount. And the integrated silica inflow amount is a product of the raw water silica concentration measured by the raw water silica concentration measuring unit and the raw water flow rate measured by the raw water flow measuring unit. When the estimated information includes the integrated silica inflow amount, and the regeneration temperature control unit has the electrical conductivity measured by the treated water electrical conductivity measuring unit larger than a standard treated water electrical conductivity The integrated silica inflow amount calculated by the integrated silica inflow amount calculation unit is less than or equal to a first reference integrated silica inflow amount, the regenerating liquid or the anion exchange resin bed is set to a first temperature. The integrated silica inflow calculated by the integrated silica inflow amount calculation unit when the electrical conductivity measured by the treated water electrical conductivity measurement unit is greater than the reference treated water electrical conductivity. When the amount is larger than the first reference cumulative silica inflow amount, the temperature adjusting unit is controlled so that the temperature of the regenerated liquid or the anion exchange resin bed becomes a second temperature higher than the first temperature, When the electrical conductivity measured by the treated water electrical conductivity measuring unit is equal to or lower than the reference treated water electrical conductivity, the temperature of the regenerated liquid or the anion exchange resin bed is set to the first temperature. The regeneration temperature control unit controls the adjustment unit, and the regeneration temperature control unit calculates the integration calculated by the integration silica inflow amount calculation unit every time the distribution control unit switches the distribution unit from the water treatment mode to the regeneration mode. It is preferable to reset the silica inflow to a predetermined initial value.

  The silica adsorption amount estimation information output unit includes a raw water flow rate measurement unit that measures the flow rate of raw water, and an integrated silica inflow amount calculation unit that calculates an integrated silica inflow amount. Calculated by the product of the raw water silica concentration measured by the raw water silica concentration measuring unit and the raw water flow rate measured by the raw water flow rate measuring unit, and the estimated information includes the integrated silica inflow amount, and the regeneration temperature. When the integrated silica inflow amount calculated by the integrated silica inflow amount calculation unit is equal to or less than a second reference integrated silica inflow amount, the control unit is configured so that the temperature of the regeneration solution or the anion exchange resin bed becomes the first temperature. When the integrated silica inflow amount calculated by the integrated silica inflow amount calculation unit is larger than the second reference integrated silica inflow amount, the regeneration liquid or the anion exchange resin bed is controlled. The temperature adjustment unit is controlled so that the temperature becomes a second temperature higher than the first temperature, and the regeneration temperature control unit controls the temperature adjustment unit so that the temperature of the regeneration solution becomes the second temperature. In this case, when the flow control unit switches the flow unit from the water treatment mode to the regeneration mode, the regeneration temperature control unit sets the accumulated silica inflow amount calculated by the accumulated silica inflow amount calculating unit to a predetermined value. It is preferable to reset to the initial value.

  When the cumulative silica inflow amount is larger than the second reference cumulative silica inflow amount, the flow control means preferably switches the flow means from the water treatment mode to the regeneration mode.

  When the silica concentration measured by the treated water silica concentration measuring unit for measuring the treated water silica concentration is larger than the reference treated water silica concentration, the regeneration temperature control unit is It is preferable to control the temperature adjusting unit so that the temperature of the regenerated liquid or the anion exchange resin bed becomes the second temperature, and the flow control unit switches from the water treatment mode to the regeneration mode.

  ADVANTAGE OF THE INVENTION According to this invention, the water treatment system provided with the ion exchange apparatus which has an anion exchange resin bed can provide the water treatment system which can suppress the energy consumed.

It is a schematic structure figure of water treatment system 1 concerning a 1st embodiment of the present invention. 3 is a flowchart of the operation of the water treatment system 1. It is a schematic block diagram of the water treatment system 1A which concerns on 2nd Embodiment of this invention. It is a flowchart of operation | movement of 1 A of water treatment systems. It is a schematic block diagram of the water treatment system 1B which concerns on 3rd Embodiment of this invention. It is a flowchart of operation | movement of the water treatment system 1B. It is a schematic block diagram of the water treatment system 1C which concerns on 4th Embodiment of this invention. It is a flowchart of operation | movement of 1 C of water treatment systems. It is a modification of the flowchart of operation | movement of 1 C of water treatment systems. It is a figure which shows the whole structure of the raw | natural water silica density | concentration measurement part. It is a graph which shows the relationship between the elapsed time after a reagent addition start, and the light absorbency of the test water W101.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram showing a water treatment system 1 according to a first embodiment of the present invention. In the following description, “line” is a general term for a flow path, a path, a pipeline, and the like.

  As shown in FIG. 1, the water treatment system 1 of the first embodiment includes an ion exchange device 11 having a cation exchange column 11A and an anion exchange column 11B, a cation exchange column flow switching valve 12A, and an anion exchange. A circulation unit 12 having a tower flow path switching valve 12B, a regenerated liquid tank 13 having a regenerated liquid tank 13A for cation exchange resin and a regenerated liquid tank 13B for anion exchange resin, a raw water silica concentration measuring unit 14, and treated water A silica concentration measuring unit 15, a temperature adjusting unit 16, and a control device 17 are provided. The ion exchange device 11 in this embodiment is a so-called two-bed two-column type ion exchange device.

  The water treatment system 1 includes a raw water supply line L11, a water flow line L12, a treated water line L13, a regenerated liquid supply line L14 for cation exchange resin, a regenerated liquid discharge line L15 for cation exchange resin, and an anion. An exchange resin regeneration liquid supply line L16 and an anion exchange resin regeneration liquid discharge line L17 are provided.

  In the raw water supply line L11, raw water W11 such as tap water and groundwater flows. The downstream end of the raw water supply line L11 is connected to the cation exchange tower flow path switching valve 12A. The upstream end of the raw water supply line L11 is connected to a raw water supply unit (not shown).

  The cation removal water W12 discharged from the cation exchange tower 11A through the cation exchange tower flow path switching valve 12A flows through the water flow line L12. The upstream end of the water flow line L12 is connected to the cation exchange tower flow path switching valve 12A, and the downstream end of the water flow line L12 is connected to the anion exchange tower flow path switching valve 12B.

  In the treated water line L13, treated water W13 (pure water, demineralized water) discharged from the anion exchange tower 11B through the anion exchange tower flow path switching valve 12B flows. The upstream end of the treated water line L13 is connected to the anion exchange tower flow path switching valve 12B, 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

  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 cation exchange resin. It is connected to the tower flow path switching valve 12A. The waste liquid W15 used for the regeneration of the cation exchange resin bed flows through the regeneration liquid discharge line L15 for the cation exchange resin. The upstream end of the cation exchange resin regeneration liquid discharge line L15 is connected to the cation exchange tower flow path switching valve 12A. The downstream end of the cation exchange resin regeneration liquid discharge line L15 is connected to a regeneration liquid discharge section (not shown).

  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 anion exchange. It is connected to the tower flow path switching valve 12B. The waste liquid W17 after being used for the regeneration of the anion exchange resin bed flows through the anion exchange resin regeneration liquid discharge line L17. The upstream end of the regenerated liquid discharge line L17 for anion exchange resin is connected to the anion exchange tower flow path switching valve 12B. The downstream end of the anion exchange resin regeneration liquid discharge line L17 is connected to a regeneration liquid discharge section (not shown).

  The raw water silica concentration measurement unit 14 is connected to the raw water supply line L11 at the connection portion J1. The treated water silica concentration measuring unit 15 is connected to the treated water line L13 at the connection portion J2. The temperature adjusting unit 16 is provided in the regenerated liquid supply line L16 for anion exchange resin. The control device 17 is electrically connected to the cation exchange column flow switching valve 12A, the anion exchange column flow switching valve 12B, the raw water silica concentration measuring unit 14, the treated water silica concentration measuring unit 15, and the temperature adjusting unit 16. ing. In FIG. 1, the path of electrical connection is indicated by a broken line.

  The cation exchange tower 11A is composed of a pressure tank containing an ion exchange resin bed (not shown) made of a cation exchange resin. When the raw water W11 is introduced into the cation exchange tower 11A via the raw water supply line L11, the cation exchange tower 11A removes the cation from the introduced raw water W11 and removes the cation from the raw water W11. It distribute | circulates to the water flow line L12 as the cation removal water W12. Further, when the cation exchange resin regeneration liquid W14 is introduced into the cation exchange tower 11A via the cation exchange resin regeneration liquid supply line L14, the cation exchange resin bed is regenerated.

  The anion exchange column 11B is composed of a pressure tank containing an ion exchange resin bed (not shown) made of an anion exchange resin. When the cation-removed water W12 is introduced into the anion exchange column 11B via the water passage line L12, the anion-exchange column 11B removes the anions from the cation-removed water W12 and then removes the anions from the cation-removed water W12. The water from which ions have been removed is circulated through the treated water line L13 as treated water W13 (pure water, demineralized water). Further, when the anion exchange resin regeneration liquid W16 is introduced into the anion exchange column 11B via the anion exchange resin regeneration liquid supply line L16, the anion exchange resin bed is regenerated.

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 bed of the cation exchange tower 11A.
In the anion exchange resin regeneration liquid tank 13B, an alkali solution such as an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution is stored as a regeneration liquid for the anion exchange resin bed of the anion exchange tower 11B.

The cation exchange tower flow path switching valve 12A introduces the raw water W11 into the cation exchange tower 11A via the raw water supply line L11, and circulates the cation removal water W12 through the water line L12. The cation exchange resin regeneration liquid W14 is introduced into the cation exchange tower 11A via the exchange resin regeneration liquid supply line L14, and the flow path for regenerating the cation exchange resin bed of the cation exchange tower 11A is switched. It is a possible valve.
The anion exchange tower flow path switching valve 12B introduces the cation-removed water W12 into the anion exchange tower 11B via the water flow line L12, and the flow path for circulating the treated water W13 to the treated water line L13, A flow path for introducing the anion exchange resin regeneration liquid W16 into the anion exchange tower 11B through the ion exchange resin regeneration liquid supply line L16 and regenerating the anion exchange resin bed of the anion exchange tower 11B; A switchable valve.

  The cation exchange tower flow path switching valve 12A and the anion exchange tower 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 the cation exchange tower 11A and And a regeneration mode for regenerating the cation exchange resin bed and the anion exchange resin bed by introducing the regeneration liquid W14 for the cation exchange resin and the regeneration liquid W16 for the anion exchange resin into each of the anion exchange columns 11B. Functions as a distribution means.

  The raw water silica concentration measuring unit 14 is a measuring instrument that measures the silica concentration of the raw water W11 flowing through the raw water supply line L11 and outputs the measured silica concentration value F1 to the control device 17. Here, the silica adsorption amount of the anion exchange resin bed depends on the value of the silica concentration of the raw water W11. Therefore, the value of the silica concentration is estimation information for estimating the silica adsorption amount of the anion exchange resin bed, and is used as estimation information based on the raw water silica concentration measured by the raw water silica concentration measurement unit 14. Moreover, the raw | natural water silica density | concentration measurement part 14 functions as a silica adsorption amount estimation information output part.

  The treated water silica concentration measuring unit 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 F2 to the control device 17. Specific configurations of the raw water silica concentration measurement unit 14 and the treated water silica concentration measurement unit 15 will be described later with reference to FIGS. 10 and 11.

  The temperature adjusting unit 16 is provided in the regenerated liquid supply line L16 for anion exchange resin. The temperature adjusting unit 16 adjusts the temperature of the anion exchange resin regenerating liquid W16 flowing through the anion exchange resin regenerating liquid supply line L16. The temperature of the regenerated liquid W16 for anion exchange resin set by the temperature adjustment unit 16 is a temperature corresponding to a control signal from the control device 17. The temperature adjustment unit 16 includes a heat exchanger that uses heat exchange with steam supplied from the outside, a heater, and the like.

  The control device 17 includes a flow control unit 17A as a flow control means, a regeneration temperature control unit 17B, and a counter 17C. The flow control unit 17A controls the cation exchange column flow switching valve 12A and the anion exchange column flow switching valve 12B so as to switch between the water treatment mode and the regeneration mode based on a predetermined transition condition. The regeneration temperature control unit 17B compares the silica concentration value F1 of the raw water W11 measured by the raw water silica concentration measurement unit 14 with the reference raw silica concentration value F0 that is set and held in advance. When the regeneration temperature control unit 17B determines that F1 ≦ F0, the regeneration temperature control unit 17B controls the temperature adjustment unit 16 so that the temperature of the regeneration solution W16 for anion exchange resin becomes the first temperature T1 when the regeneration mode is executed. When it is determined that F1> F0, the temperature adjustment unit 16 is controlled so that the temperature of the regenerated liquid W16 for anion exchange resin becomes the second temperature T2 higher than the first temperature T1 when the regeneration mode is executed. Further, the regeneration temperature control unit 17B compares the silica concentration value F2 of the treated water W13 measured by the treated water silica concentration measuring unit 15 with the reference treated silica concentration value Fr that has been set and held in advance. . When it is determined that F2> Fr, the regeneration temperature control unit 17B controls the temperature adjustment unit 16 so that the temperature of the anion exchange resin regeneration solution W16 becomes the second temperature T2. When the regeneration temperature control unit 17B determines that F2> Fr, the flow control unit 17A switches from the water treatment mode to the regeneration mode and forcibly regenerates the anion exchange resin bed. The value of the counter 17C is controlled by the regeneration temperature control unit 17B. The initial value of the counter 17C is set to 0 (zero), for example.

Next, operation | movement of the water treatment system 1 of 1st Embodiment is demonstrated, referring the flowchart of FIG. FIG. 2 is a flowchart of the operation of the water treatment system 1.
As shown in FIG. 2, in step ST101, the flow control unit 17A operates the cation exchange tower flow path switching valve 12A and the anion exchange tower flow path switching valve 12B in the water treatment mode. The raw water W11 is introduced into the cation exchange tower 11A via the raw water supply line L11 and the cation exchange tower flow path switching valve 12A. In the introduced raw water W11, cations are removed by the cation exchange tower 11A, and circulates through the water flow line L12 as cation-removed water W12. The cation-removed water W12 is introduced into the anion exchange column 11B via the water flow line L12 and the anion exchange column flow switching valve 12B. In the introduced cation-removed water W12, anions and silica (colloidal silica and ionic silica) are removed by the anion exchange tower 11B, and the treated water line L13 is circulated as treated water W13 (pure water, demineralized water). To do.

  In step ST102, the regeneration temperature control unit 17B acquires the silica concentration value F2 from the treated water silica concentration measurement unit 15. Specifically, the regeneration temperature control unit 17B controls the treated water silica concentration measuring unit 15 so as to measure the silica concentration of the treated water W13 flowing through the treated water line L13 at predetermined time intervals. Then, the regeneration temperature control unit 17B acquires the silica concentration value F2 output from the treated water silica concentration measurement unit 15.

  In step ST103, the regeneration temperature control unit 17B compares the silica concentration value F2 with the reference treated silica concentration value Fr set and held in advance. If the regeneration temperature control unit 17B determines that F2 ≦ Fr (YES), the process proceeds to step ST104. In step ST103, when the regeneration temperature control unit 17B determines that F2 ≦ Fr is not satisfied (NO), the process proceeds to step ST114. The reference treated water silica concentration value Fr is a value of the silica concentration that is allowed in the treated water W13. The value Fr of the reference treated water silica concentration is determined according to the allowable amount based on the required quality of the treated water W13 at the demand point.

  In step ST104, the regeneration temperature control unit 17B acquires the silica concentration value F1 from the raw water silica concentration measuring unit 14. Specifically, the regeneration temperature control unit 17B controls the raw water silica concentration measuring unit 14 so as to measure the silica concentration of the raw water W11 flowing through the raw water supply line L11 at a predetermined time interval. Then, the regeneration temperature control unit 17B acquires the silica concentration value F1 output from the raw water silica concentration measurement unit 14.

  In step ST105, the regeneration temperature control unit 17B compares the silica concentration value F1 with the reference raw silica concentration value F0 that is set and maintained in advance. If the regeneration temperature control unit 17B determines that F1> F0 (YES), the process proceeds to step ST106. If the regeneration temperature control unit 17B determines that F1> F0 is not satisfied (NO), the process proceeds to step ST107. The reference raw silica concentration value F0 is appropriately determined according to the amount of silica adsorbed on the anion exchange resin bed that requires heating regeneration (regeneration at the second temperature) in the anion exchange column 11B. .

In step ST106, the regeneration temperature control unit 17B increases the value of the counter 17C by one.
In step ST107, the regeneration temperature control unit 17B compares the value of the counter 17C with a predetermined value (for example, “1”) set and held in advance. When the regeneration temperature control unit 17B determines that the value of the counter 17C ≧ 1 (YES), the process proceeds to step ST108. If the regeneration temperature control unit 17B determines that the value of the counter 17C is not ≧ 1 (NO), the process proceeds to step ST109.

In step ST108, the regeneration temperature control unit 17B sets the temperature of the anion exchange resin regeneration solution W16, which is adjusted when the regeneration mode (step ST111 described later) is performed, to the second temperature T2.
In step ST109, the regeneration temperature control unit 17B sets the temperature of the anion exchange resin regeneration solution W16 to be adjusted when the regeneration mode is executed to the first temperature T1. The second temperature T2 is a temperature higher than the first temperature T1. The first temperature T1 is, for example, 5 ° C. to 35 ° C., and the second temperature T2 is, for example, 40 ° C. to 60 ° C.

  In step ST110, the flow control unit 17A determines whether or not a predetermined transition condition (regeneration start condition) is satisfied, for example, whether the cation exchange tower flow path switching valve 12A and the anion exchange tower flow path switching valve 12B are predetermined. It is determined whether or not it has been operated in the water treatment mode for a period of time. Alternatively, for example, it may be determined whether or not the amount of the treated water W13 in the water treatment mode has reached a predetermined amount. If distribution control unit 17A determines that the predetermined transition condition is satisfied (YES), the process proceeds to step ST111. When distribution control unit 17A does not determine that the predetermined transition condition is satisfied (NO), the process returns to step ST102 and continues the operation in the water treatment mode.

  In step ST111, the flow control unit 17A operates the cation exchange tower flow path switching valve 12A and the anion exchange tower flow path switching valve 12B in the regeneration mode. That is, in step ST110, in order to regenerate the ion exchange resin bed that has lost the ion removal capability, the flow control unit 17A introduces a regenerating solution into each of the cation exchange column 11A and the anion exchange column 11B. The ion exchange tower flow path switching valve 12A and the anion exchange tower flow path switching valve 12B are controlled.

  In step ST108, when the temperature of the anion exchange resin regenerating liquid W16 is set to the second temperature T2, the regeneration temperature control unit 17B sets the temperature of the anion exchange resin regenerating liquid W16 to the second temperature T2. Thus, the temperature adjustment unit 16 is controlled. Thereby, the regenerated liquid W16 for anion exchange resin adjusted to the second temperature T2 by the temperature adjustment unit 16 is introduced into the anion exchange column 11B. In Step ST109, when the temperature of the anion exchange resin regeneration liquid W16 is set to the first temperature T1, the regeneration temperature control unit 17B determines that the temperature of the anion exchange resin regeneration liquid W16 is the first temperature T1. The temperature adjustment unit 16 is controlled so that Thereby, the regenerated liquid W16 for anion exchange resin adjusted to the first temperature T1 by the temperature adjusting unit 16 is introduced into the anion exchange column 11B.

  When the first temperature T1 is the ambient temperature (room temperature) and the second temperature T2 is a temperature higher than the ambient temperature (room temperature), the temperature adjustment unit 16 uses the anion exchange resin regenerating liquid W16 as follows. Adjust the temperature. That is, when the temperature adjusting unit 16 is controlled to adjust the temperature of the anion exchange resin regenerating liquid W16 to the first temperature T1, the temperature adjusting unit 16 does not heat the anion exchange resin regenerating liquid W16, thereby The temperature of the regeneration resin regenerating liquid W16 is adjusted to the first temperature T1 (that is, the ambient temperature (room temperature)). In this case, room temperature regeneration of the anion exchange resin bed is performed. On the other hand, when the temperature adjusting unit 16 is controlled so as to adjust the temperature of the anion exchange resin regenerating liquid W16 to the second temperature T2, the temperature adjusting unit 16 heats the anion exchange resin regenerating liquid W16, thereby The temperature of the regenerant liquid W16 for exchange resin is adjusted to be the second temperature T2. In this case, heating regeneration of the anion exchange resin bed is performed.

In step ST112, the distribution control unit 17A determines whether or not a predetermined transition condition (regeneration end 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. . If the distribution control unit 17A determines that the predetermined transition condition is not satisfied (NO), the process returns to step ST112 and continues the operation in the reproduction mode. The cation exchange resin bed of the cation exchange column 11A and the anion exchange resin bed of the anion exchange column 11B are regenerated until a predetermined transition condition is satisfied, and returned to the original ion exchange capacity.
If distribution control unit 17A determines that the predetermined transition condition is satisfied (YES), the process proceeds to step ST113.

  In step ST113, the regeneration temperature control unit 17B resets the value of the counter 17C to zero. After the regeneration temperature control unit 17B resets the counter 17C, the process returns to step ST101 and starts the operation in the water treatment mode again.

  The steps after step ST114 (step ST103: NO) will be described. In step ST114, the regeneration temperature control unit 17B sets the temperature of the anion exchange resin regeneration solution W16, which is adjusted when the regeneration mode (step ST111 described above) is performed, to the second temperature T2. At this time, the distribution control unit 17A switches from the water treatment mode to the regeneration mode regardless of predetermined transition conditions (conditions in step ST110). Therefore, the process proceeds to step ST111. The processing after step ST111 is as described above. Therefore, when it is determined in step ST103 that F2 ≦ Fr is not satisfied, the regeneration temperature control unit 17B sets the temperature of the anion exchange resin regeneration solution W16 to the second temperature T2, and the flow control unit 17A Switch from processing mode to playback mode.

  In step ST105, the regeneration temperature control unit 17B compares the silica concentration value F1 with the reference raw silica concentration value F0 that is set and maintained in advance as follows. When F1> F0 (YES), the concentration of silica contained in the raw water W11 is large, and the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B in one water treatment mode exceeds the allowable amount. It is estimated to be. When the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B is estimated to exceed the allowable amount, the regeneration liquid W16 for anion exchange resin is adjusted to the second temperature T2 in the regeneration mode. It is necessary to sufficiently recover the ion exchange capacity by heating regeneration. Therefore, the process of step ST105 is performed to estimate whether or not the amount of silica adsorbed on the anion exchange resin bed of the anion exchange column 11B exceeds the allowable amount.

  In step ST107, the reason why the regeneration temperature control unit 17B compares the value of the counter 17C with a predetermined value (for example, 1) set and held in advance is as follows. When the value of the counter 17C is equal to or greater than a predetermined value (YES), it is estimated that the amount of silica adsorbed on the anion exchange resin bed of the anion exchange column 11B is large in the water treatment mode. When the value of the counter 17C is smaller than the predetermined value, it is estimated that the amount of silica adsorbed on the anion exchange resin bed is not large. When the amount of silica adsorbed on the anion exchange resin bed of the anion exchange column 11B is large, the regeneration solution W16 for anion exchange resin needs to be adjusted to the second temperature T2 in the regeneration mode, and the anion When the amount of silica adsorbed on the anion exchange resin bed of the exchange tower 11B is not large, the regeneration solution W16 for anion exchange resin does not need to be adjusted to the second temperature T2 in the regeneration mode, and the first temperature T1. It only has to be adjusted. Therefore, the process of step ST107 is performed to determine whether to adjust the anion exchange resin regenerating liquid W16 to the first temperature T1 or the second temperature T2.

  The predetermined value may be an integer larger than “1”. For example, when the predetermined value is “2”, the regenerated liquid W16 for anion exchange resin is not adjusted to the second temperature T2 only by determining once F1> F0 in the water treatment mode. In the water treatment mode, when it is determined that F1> F0 at least twice, the anion exchange resin regenerating liquid W16 is adjusted to the second temperature T2. For example, if the water quality fluctuation of the raw water W11 is severe, setting the predetermined value to “2” or more will result in an erroneous increase in the amount of silica adsorbed on the anion exchange resin bed due to an instantaneous increase in silica concentration. It can prevent judging.

  The reason why the regeneration temperature control unit 17B compares the value F2 of the silica concentration with the value Fr of the reference treated silica concentration that has been set and held in advance in Step ST103 is as follows. When F2> Fr, the silica concentration contained in the treated water W13 exceeds an allowable concentration and does not satisfy the required quality of the treated water W13 at the demand location. That is, since silica is leaked into the treated water W13, it is necessary to immediately regenerate the anion exchange resin bed of the anion exchange tower 11B. Furthermore, since it is considered that a large amount of adsorbed silica needs to be desorbed when regenerating, the temperature of the anion exchange resin regenerating liquid W16 needs to be the second temperature T2. Therefore, in the process of step ST103, it is determined whether or not the anion exchange resin bed needs to be immediately regenerated (that is, heated regeneration) with the anion exchange resin regenerating liquid W16 as the second temperature T2. To be done.

  In addition, in the water treatment system 1 of 1st Embodiment, the treated water silica density | concentration measurement part 15 does not need to be provided. Even if the treated water silica concentration measurement unit 15 is not provided, the silica adsorption amount estimation information output unit (raw water silica concentration measurement unit 14) is used to adsorb to the anion exchange resin bed of the anion exchange tower 11B. This is because the amount of silica is estimated. When the treated water silica concentration measuring unit 15 is not provided, step ST102, step ST103, and step ST114 are omitted in FIG.

  Moreover, although the temperature adjustment part 16 adjusted the temperature of the regenerated liquid W16 for anion exchange resin, you may make it adjust the temperature of the anion exchange resin bed of the anion exchange tower 11B.

  According to the water treatment system 1 of the first embodiment, the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B can be estimated based on the silica concentration value of the raw water. Then, based on the estimated amount of silica, it is determined whether to adjust the regenerated liquid W16 for anion exchange resin to the first temperature T1 or the second temperature T2. Since the first temperature T1 is lower than the second temperature T2, the energy consumed when adjusting the temperature of the anion exchange resin regenerating liquid W16 is suppressed. In addition, when the treated water silica concentration measuring unit 15 is provided, regeneration with the anion exchange resin regeneration liquid W16 at the second temperature T2 is performed at a more appropriate timing.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a schematic view showing a water treatment system 1A according to the second embodiment of the present invention. The second embodiment will be described mainly with respect to differences from the first embodiment, and detailed description of the same configuration as the first embodiment will be omitted. For the points that are not particularly described, the description of the first embodiment is applied as appropriate. In the following description, “line” is a general term for a flow path, a path, a pipeline, and the like.

  The water treatment system 1A of the second embodiment differs from the water treatment system 1 of the first embodiment in the configuration in that the raw water electrical conductivity measurement unit 18 and the raw water silica ratio calculation unit 19 are further provided. The raw water electrical conductivity measuring unit 18 is connected to the raw water supply line L11 at the connection portion J3. The connection part J3 is located downstream of the connection part J1. The raw water silica ratio calculation unit 19 is electrically connected to the raw water silica concentration measurement unit 14, the raw water electrical conductivity measurement unit 18, and the control device 17.

The raw water silica concentration measuring unit 14 is a measuring instrument that measures the silica concentration of the raw water W11 flowing through the raw water supply line L11 and outputs the measured silica concentration value to the raw water silica ratio calculating unit 19.
The raw water electrical conductivity measuring unit 18 is a measuring instrument that measures the electrical conductivity of the raw water W11 flowing through the raw water supply line L11 and outputs the measured electrical conductivity value to the raw water silica ratio calculating unit 19.
The raw water silica ratio calculation unit 19 is a computer that calculates the silica ratio of the raw water W11 flowing through the raw water supply line L11 and outputs the calculated raw water silica ratio value Rs to the control device 17.

In the raw water silica ratio calculation unit 19, the silica ratio of the raw water is calculated as follows.
Raw water silica ratio = raw water silica concentration [g / m ³ ] / (raw water silica concentration [g / m ³ ] + raw water anion concentration [g / m ³ ]) (1a)
Here, the raw water anion concentration corresponds to 50% of the total ion concentration of the raw water W11. This is because the ions contained in the raw water W11 always have the same sum of anions and cations due to the principle of electrical neutrality.
Therefore, Formula (1a) can be transformed into the following formula.
Raw water silica ratio = raw water silica concentration [g / m ³ ] / (raw water silica concentration [g / m ³ ] + raw water total ion concentration [g / m ³ ] / 2) (1b)
The total ion concentration of the raw water can be substituted with the total dissolved solid content (hereinafter also referred to as “TDS”) of the raw water W11.
Raw water total ion concentration [g / m ³ ] = TDS [g / m ³ ] (1c)
TDS can be obtained by the following equation.
TDS [g / m ³ ] = Electric conductivity of raw water W11 [μS / cm] × conversion coefficient (1d)
The conversion coefficient is a constant determined in the range of 0.45 to 1 depending on the quality of the raw water W11. The conversion factor depends on the salinity concentration of the raw water W11, and becomes higher as the salinity concentration is higher. For example, in normal tap water or industrial water, the conversion factor is set to 0.5 (or 0.4 to 0.6). Is done.

From formula (1b), formula (1c) and formula (1d), the raw water silica ratio is calculated by the following formula.
Raw water silica ratio = [Raw water silica concentration [g / m ³ ] / (Raw water silica concentration [g / m ³ ] + Raw water electrical conductivity [μS / cm]) / 2 × Conversion coefficient] (1e)
As described above, the raw water silica ratio calculation unit 19 includes the silica concentration value output from the raw water silica concentration measurement unit 14, the electrical conductivity value output from the raw water electrical conductivity measurement unit 18, the formula (1e), Is used to calculate the silica ratio of the raw water W11.

  Here, the silica adsorption amount of the anion exchange resin bed depends on the value of the silica ratio of the raw water W11. Therefore, the value of the silica ratio of the raw water W11 is estimation information for estimating the silica adsorption amount of the anion exchange resin bed, and is used as estimation information based on the raw water silica concentration measured by the raw water silica concentration measurement unit 14. Is done. The raw water silica concentration measuring unit 14, the raw water electrical conductivity measuring unit 18, and the raw water silica ratio calculating unit 19 function as a silica adsorption amount estimation information output unit.

  The control device 17 includes a flow control unit 17A as a flow control means, a regeneration temperature control unit 17B, and a counter 17C. The flow control unit 17A controls the cation exchange column flow switching valve 12A and the anion exchange column flow switching valve 12B so as to switch between the water treatment mode and the regeneration mode based on a predetermined transition condition. The regeneration temperature control unit 17B compares the raw water silica ratio value Rs calculated by the raw water silica ratio calculation unit 19 with the reference raw water silica ratio value R0 set and held in advance. When it is determined that Rs ≦ R0, the regeneration temperature control unit 17B controls the temperature adjustment unit 16 so that the temperature of the anion exchange resin regeneration solution W16 becomes the first temperature T1 when the regeneration mode is executed. When it is determined that Rs> R0, the temperature adjusting unit 16 is controlled such that the temperature of the anion exchange resin regenerating liquid W16 becomes the second temperature T2 higher than the first temperature T1 when the regeneration mode is executed. Further, the regeneration temperature control unit 17B compares the silica concentration value F2 of the treated water W13 measured by the treated water silica concentration measuring unit 15 with the reference treated silica concentration value Fr that has been set and held in advance. . When it is determined that F2> Fr, the regeneration temperature control unit 17B controls the temperature adjustment unit 16 so that the temperature of the anion exchange resin regeneration solution W16 becomes the second temperature T2. When the regeneration temperature control unit 17B determines that F2> Fr, the flow control unit 17A switches from the water treatment mode to the regeneration mode and forcibly regenerates the anion exchange resin bed. The value of the counter 17C is controlled by the regeneration temperature control unit 17B. The initial value of the counter 17C is set to 0 (zero), for example.

  Next, operation | movement of 1 A of water treatment systems of 2nd Embodiment is demonstrated, referring the flowchart of FIG. FIG. 4 is a flowchart of the operation of the water treatment system 1A.

Steps ST201 to ST203 in FIG. 4 are the same as steps ST101 to ST103 in FIG.
In step ST204, unlike step ST104, the regeneration temperature control unit 17B acquires the raw water silica ratio value Rs from the raw water silica ratio calculation unit 19. Specifically, the regeneration temperature control unit 17B controls the raw water silica ratio calculation unit 19 so as to calculate the silica ratio of the raw water W11 flowing through the raw water supply line L11. Then, the regeneration temperature control unit 17B acquires the value Rs of the raw water silica ratio output from the raw water silica ratio calculation unit 19.

In step ST205, the regeneration temperature control unit 17B compares the raw water silica ratio value Rs with the reference raw water silica ratio value R0 set and held in advance. If the regeneration temperature control unit 17B determines that Rs> R0 (YES), the process proceeds to step ST206. If the regeneration temperature control unit 17B determines that Rs> R0 is not satisfied (NO), the process proceeds to step ST207. The value R0 of the reference raw water silica ratio is appropriately determined according to the amount of silica adsorbed on the anion exchange resin bed that requires heating regeneration (regeneration at the second temperature) in the anion exchange column 11B. .
Since the process of step ST206-step 214 is the same as the process of step ST106-step ST114, description is abbreviate | omitted.

  In step ST205, the regeneration temperature control unit 17B compares the raw water silica ratio value Rs with the reference raw water silica ratio value R0 set and held in advance as follows. When Rs> R0 (YES), the silica ratio contained in the raw water W11 is large, and the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B in one water treatment mode exceeds the allowable amount. Presumed. When the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B is estimated to exceed the allowable amount, the regeneration liquid W16 for anion exchange resin is adjusted to the second temperature T2 in the regeneration mode. It is necessary to sufficiently recover the ion exchange capacity by heating regeneration. Therefore, the process of step ST205 is performed to estimate whether or not the amount of silica adsorbed on the anion exchange resin bed of the anion exchange column 11B exceeds the allowable amount.

  In addition, in the water treatment system 1A of 2nd Embodiment, the treated water silica density | concentration measurement part 15 does not need to be provided. Even if the treated water silica concentration measuring unit 15 is not provided, the silica adsorption amount estimation information output unit (raw water silica concentration measuring unit 14, raw water electrical conductivity measuring unit 18 and raw water silica ratio calculating unit 19) is used. This is because the amount of silica adhering to the anion exchange resin of the anion exchange tower 11B is estimated. When the treated water silica concentration measurement unit 15 is not provided, step ST202, step ST203, and step ST214 are omitted in FIG.

  Moreover, although the temperature adjustment part 16 adjusted the temperature of the regenerated liquid W16 for anion exchange resin, you may make it adjust the temperature of the anion exchange resin bed of the anion exchange tower 11B.

  According to the water treatment system 1A of the second embodiment, the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B can be estimated based on the value of the silica silica ratio of the raw water. Then, based on the estimated amount of silica, it is determined whether to adjust the regenerated liquid W16 for anion exchange resin to the first temperature T1 or the second temperature T2. Since the first temperature T1 is lower than the second temperature T2, the energy consumed when adjusting the temperature of the anion exchange resin regenerating liquid W16 is suppressed. Further, when the treated water silica concentration measurement unit 15 is provided, regeneration can be performed with the temperature of the anion exchange resin regeneration solution W16 adjusted to the second temperature T2 at a more appropriate timing.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a schematic view showing a water treatment system 1B according to the third embodiment of the present invention. The third embodiment will be described mainly with respect to differences from the first embodiment, and detailed description of the same configuration as the first embodiment will be omitted. For the points that are not particularly described, the description of the first embodiment is applied as appropriate. In the following description, “line” is a general term for a flow path, a path, a pipeline, and the like.

  The water treatment system 1B of the third embodiment is further provided with a raw water flow rate measurement unit 20, an integrated silica inflow calculation unit 21, and a treated water electrical conductivity measurement unit 22, and the control device 17 does not have a counter 17C. Thus, the configuration differs from the water treatment system 1 of the first embodiment. The raw water flow rate measuring unit 20 is provided downstream of the connecting portion J1 in the raw water supply line L11. The integrated silica inflow amount calculating unit 21 is electrically connected to the raw water silica concentration measuring unit 14, the integrated silica inflow amount calculating unit 21, and the control device 17. The treated water electrical conductivity measuring unit 22 is connected to the treated water line L13 at the connection portion J3. The connection part J3 is located upstream of the connection part J2.

The raw water silica concentration measuring unit 14 is a measuring instrument that measures the silica concentration of the raw water W11 flowing through the raw water supply line L11 and outputs the measured silica concentration value to the integrated silica inflow amount calculating unit 21.
The raw water flow rate measurement unit 20 is a flow rate sensor that measures the flow rate of the raw water W11 flowing through the raw water supply line L11 and outputs the measured flow rate value to the integrated silica inflow amount calculation unit 21. The raw water flow rate measurement unit 20 is configured to be able to detect an instantaneous flow rate and an integrated flow rate. For example, a tangential flow rate sensor or an axial flow rate sensor can be used.
The integrated silica inflow amount calculation unit 21 is a computer that calculates an integrated silica flow rate contained in the raw water W11 flowing through the raw water supply line L11 and outputs the calculated integrated silica inflow amount value FL1 to the control device 17.
The treated water electrical conductivity measuring unit 22 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 treated water electrical conductivity value E to the control device 17.

  The integrated silica inflow amount calculated by the integrated silica inflow amount calculation unit 21 is calculated by the product of the silica concentration measured by the raw water silica concentration measurement unit 14 and the flow rate value measured by the raw water flow rate measurement unit 20. . Note that the silica concentration of the raw water W11 may not be constant. Therefore, specifically, for example, the integrated silica flow rate of raw water is calculated as follows. First, the integrated silica inflow calculation unit 21 is configured to measure the silica concentration per unit cycle time measured by the raw water silica concentration measurement unit 14 at a predetermined interval and the raw water flow rate per unit cycle time measured by the raw water flow rate measurement unit 20 in real time. And calculate the silica inflow per unit cycle time. Thereafter, the integrated silica inflow amount calculation unit 21 can calculate the integrated silica inflow amount by sequentially adding the silica inflow amount per unit cycle time. Further, the predetermined interval can be appropriately changed according to the expected change in the silica concentration of the raw water W11.

  Here, the silica adsorption amount of the anion exchange resin bed depends on the cumulative silica inflow amount of the raw water W11. Therefore, the cumulative silica inflow amount is estimation information for estimating the silica adsorption amount of the anion exchange resin bed, and is used as estimation information based on the raw water silica concentration measured by the raw water silica concentration measurement unit 14. Moreover, the raw | natural water silica density | concentration measurement part 14, the raw | natural water flow volume measurement part 20, and the integrating | accumulating silica inflow amount calculation part 21 function as a silica adsorption amount estimation information output part.

  The control device 17 includes a distribution control unit 17A as a distribution control unit and a regeneration temperature control unit 17B. The flow control unit 17A controls the cation exchange column flow switching valve 12A and the anion exchange column flow switching valve 12B so as to switch between the water treatment mode and the regeneration mode based on a predetermined transition condition. The regeneration temperature control unit 17B compares the treated water electrical conductivity value E measured by the treated water electrical conductivity measuring unit 22 with the reference treated water electrical conductivity value E0 set and held in advance. . When the regeneration temperature control unit 17B determines that E> E0, the integrated silica inflow amount value FL1 calculated by the integrated silica inflow amount calculation unit 21 and the first reference integrated silica inflow set and held in advance are stored. The quantity value FL01 is compared. When it is determined that FL1 ≦ FL01, the regeneration temperature control unit 17B controls the temperature adjustment unit 16 so that the temperature of the regeneration solution W16 for anion exchange resin becomes the first temperature T1 when the regeneration mode is executed. When it is determined that FL1> FL01, the temperature adjusting unit 16 is controlled so that the temperature of the anion exchange resin regenerating liquid W16 becomes the second temperature T2 higher than the first temperature T1 when the regeneration mode is executed. The regeneration temperature control unit 17B resets the integrated silica inflow value FL1 to a predetermined initial value (for example, “0”) every time the flow control unit 17A switches from the water treatment mode to the regeneration mode. Further, the regeneration temperature control unit 17B compares the silica concentration value F2 of the treated water W13 measured by the treated water silica concentration measuring unit 15 with the reference treated silica concentration value Fr that has been set and held in advance. . When the regeneration temperature control unit 17B determines that F2> Fr, the regeneration temperature control unit 17B controls the temperature adjustment unit 16 so that the temperature of the anion exchange resin regeneration solution W16 becomes the second temperature T2. When the regeneration temperature control unit 17B determines that F2> Fr, the flow control unit 17A switches from the water treatment mode to the regeneration mode and forcibly regenerates the anion exchange resin bed.

  Next, operation | movement of the water treatment system 1B of 3rd Embodiment is demonstrated, referring the flowchart of FIG. FIG. 6 is a flowchart of the operation of the water treatment system 1B.

Steps ST301 to ST303 in FIG. 6 are the same as steps ST101 to ST103 in FIG.
In step ST304, the regeneration temperature control unit 17B acquires the value E of the treated water electrical conductivity from the treated water electrical conductivity measuring unit 22. Specifically, the regeneration temperature control unit 17B controls the treated water electrical conductivity measuring unit 22 so as to measure the electrical conductivity of the treated water W13 flowing through the treated water line L13 in real time. Then, the regeneration temperature control unit 17B acquires the value E of the treated water electrical conductivity output from the treated water electrical conductivity measuring unit 22.

  In step ST <b> 305, the regeneration temperature control unit 17 </ b> B compares the treated water electrical conductivity value E with a reference treated water electrical conductivity value E <b> 0 set and held in advance. If the regeneration temperature control unit 17B determines that E> E0 (YES), the process proceeds to step ST306. If the regeneration temperature control unit 17B determines that E> E0 is not satisfied (NO), the process returns to step ST303. In addition, the value E0 of the reference treated water electrical conductivity is determined according to an allowable value based on the required quality of the treated water W13 at the demand point. The process of step ST305 is provided to determine a predetermined transition condition (reproduction start condition) for shifting to the reproduction mode.

  In step ST306, the regeneration temperature control unit 17B acquires the integrated silica inflow amount from the integrated silica inflow amount calculation unit 21. Specifically, the regeneration temperature control unit 17B controls the integrated silica inflow amount calculation unit 21 so as to calculate the integrated silica inflow amount from the start time of the water treatment mode. Then, the regeneration temperature control unit 17B acquires the integrated silica inflow value FL1 output from the integrated silica inflow amount calculation unit 21.

  In step ST307, the regeneration temperature control unit 17B compares the integrated silica inflow value FL1 with the first reference integrated silica inflow value FL01 that is set and held in advance. If the regeneration temperature control unit 17B determines that FL1> FL01 (YES), the process proceeds to step ST308. If the regeneration temperature control unit 17B determines that FL1> FL01 is not satisfied (NO), the process proceeds to step ST309.

The processes in steps ST308, ST309, ST310, ST311, and ST313 are the same as the processes in steps ST108, ST109, ST111, ST112, and ST114 in FIG.
If YES in step 311, the process proceeds to step ST312. In step ST312, the regeneration temperature control unit 17B resets the integrated silica inflow value FL1 of the integrated silica inflow calculation unit 21 to an initial value (for example, “0”). After the regeneration temperature control unit 17B resets the integrated silica inflow value FL1 of the integrated silica inflow amount calculation unit 21, the process returns to step ST301 and starts the operation in the water treatment mode again.

  Thus, when shifting from the regeneration mode to the water treatment mode, the integrated silica inflow amount value FL1 of the integrated silica inflow amount calculation unit 21 is reset. Therefore, when the water treatment mode is started, the integrated inflow amount of the integrated silica inflow amount calculation unit 21 is always an initial value (for example, zero). Therefore, the integrated silica inflow value FL1 calculated in the water treatment system 1B is the integrated silica inflow amount in one water treatment mode. Therefore, the value FL01 of the first reference integrated silica inflow amount is appropriately determined according to the silica adsorption amount allowed for the anion exchange resin bed in one water treatment mode.

  In step ST305, the regeneration temperature control unit 17B compares the treated water electrical conductivity value E with the reference treated water electrical conductivity value E0 set and held in advance as follows. . When E> E0, there is a possibility that the amount of anions (or cations) contained in the treated water W13 exceeds the allowable amount. That is, the anion exchange resin bed of the anion exchange tower 11B may have a reduced ability to remove anions contained in the raw water W11. And the fall of the anion removal capability in the anion exchange resin bed of the anion exchange tower 11B may be caused by excessive adsorption of silica. If the decrease in the anion removal capability in the anion exchange resin bed of the anion exchange column 11B is due to the adsorption of silica, in the next regeneration mode, the regenerated liquid W16 for anion exchange resin is the first. It is desirable to adjust to 2 temperature T2. Therefore, in the process of step ST305, it is determined whether or not the anion removal capability of the anion exchange resin bed of the anion exchange column 11B is reduced, that is, whether or not the regeneration timing of the anion exchange resin bed has been reached. This is done to determine.

  In Step ST307, the regeneration temperature control unit 17B compares the accumulated silica inflow value FL1 with the first reference accumulated silica inflow value FL01 that has been set and held in advance. . When FL1> FL01 (YES), it is determined that the amount of silica adsorbed on the anion exchange resin bed of the anion exchange column 11B in the current water treatment mode exceeds the allowable amount. And step ST307 is a process performed only when it is determined in step ST305 that the anion removal capacity of the anion exchange resin bed of the anion exchange column 11B is lowered. Therefore, when FL1> FL01 (YES), the cause of the decrease in the anion removal capacity of the anion exchange resin bed of the anion exchange column 11B is that the silica exceeding the allowable amount is adsorbed on the anion exchange resin bed. It is estimated that In this case, in the regeneration mode, it is necessary to adjust the regeneration solution W16 for anion exchange resin to the second temperature T2 in order to sufficiently remove silica from the anion exchange resin. Therefore, the process of step ST307 is performed to determine whether or not the amount of silica adsorbed on the anion exchange resin bed of the anion exchange column 11B exceeds the allowable amount. In addition, the process of step ST307 is due to the fact that the anion removal capacity in the anion exchange resin bed of the anion exchange column 11B is reduced due to adsorption of silica exceeding the allowable amount on the anion exchange resin bed. It is also determined whether or not.

  In addition, in the water treatment system 1 of 3rd Embodiment, the treated water silica density | concentration measurement part 15 does not need to be provided. Even if the treated water silica concentration measuring unit 15 is not provided, the silica adsorption amount estimation information output unit (raw water silica concentration measuring unit 14, raw water flow rate measuring unit 20, and integrated silica inflow calculating unit 21) is used. This is because the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B is estimated. When the treated water silica concentration measurement unit 15 is not provided, step ST302, step ST303, and step ST313 are omitted in FIG.

  Moreover, although the temperature adjustment part 16 adjusted the temperature of the regenerated liquid W16 for anion exchange resin, you may make it adjust the temperature of the anion exchange resin bed of the anion exchange tower 11B.

  According to the water treatment system 1B of the third embodiment, the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B can be estimated based on the value of the integrated silica inflow amount. Then, based on the estimated amount of silica, it is determined whether to adjust the regenerated liquid W16 for anion exchange resin to the first temperature T1 or the second temperature T2. Since the first temperature T1 is lower than the second temperature T2, the energy consumed when adjusting the temperature of the anion exchange resin regenerating liquid W16 is suppressed. Further, when the treated water silica concentration measurement unit 15 is provided, regeneration can be performed with the temperature of the anion exchange resin regeneration solution W16 adjusted to the second temperature T2 at a more appropriate timing.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic configuration diagram of a water treatment system 1C according to the fourth embodiment of the present invention. The fourth embodiment will be described mainly with respect to differences from the first embodiment and the third embodiment, and detailed description of the same configuration as the first embodiment and the third embodiment will be omitted. For the points that are not particularly described, the descriptions of the first embodiment and the third embodiment are applied as appropriate. In the following description, “line” is a general term for a flow path, a path, a pipeline, and the like.

  The water treatment system 1C has the same configuration as the water treatment system 1B of the third embodiment, except that the treated water electrical conductivity measuring unit 22 is not provided in the treated water line L13. The water treatment system 1C of the fourth embodiment includes a raw water silica concentration measurement unit 14, a raw water flow rate measurement unit 20, and an integrated silica inflow amount calculation unit 21, similarly to the water treatment system 1B of the third embodiment.

  Also in the water treatment system 1C, as in the water treatment system 1B of the third embodiment, the accumulated silica inflow amount is estimation information for estimating the silica adsorption amount of the anion exchange resin bed, and the raw water silica concentration measurement It is used as estimation information based on the silica concentration of raw water measured by the unit 14. Moreover, the raw | natural water silica density | concentration measurement part 14, the raw | natural water flow volume measurement part 20, and the integrating | accumulating silica inflow amount calculation part 21 function as a silica adsorption amount estimation information output part.

  The flow control unit 17A controls the cation exchange column flow switching valve 12A and the anion exchange column flow switching valve 12B so as to switch between the water treatment mode and the regeneration mode based on a predetermined transition condition. The regeneration temperature control unit 17B compares the integrated silica inflow value FL2 calculated by the integrated silica inflow calculation unit 21 with the second reference integrated silica inflow value FL02 set and held in advance. When the regeneration temperature control unit 17B determines that FL2 ≦ FL02, the regeneration temperature control unit 17B controls the temperature adjustment unit 16 so that the temperature of the anion exchange resin regeneration solution W16 becomes the first temperature T1 when the regeneration mode is executed. When it is determined that> FL02, the temperature adjusting unit 16 is controlled so that the temperature of the anion exchange resin regenerating liquid W16 becomes the second temperature T2 higher than the first temperature T1 when the regeneration mode is executed. When the regeneration temperature control unit 17B controls the temperature adjustment unit 16 that changes the temperature of the regenerated liquid W16 for anion exchange resin to the second temperature T2, the flow control unit 17A performs the cation exchange tower flow path switching valve 12A and the anion. When the exchange tower flow switching valve 12B is switched from the water treatment mode to the regeneration mode, the regeneration temperature control unit 17B sets the accumulated silica inflow amount value FL2 calculated by the accumulated silica inflow amount calculating unit 21 to a predetermined initial value (for example, , “0”). Further, the regeneration temperature control unit 17B compares the silica concentration value F2 of the treated water W13 measured by the treated water silica concentration measuring unit 15 with the reference treated silica concentration value Fr that has been set and held in advance. . When it is determined that F2> Fr, the regeneration temperature control unit 17B controls the temperature adjustment unit 16 so that the temperature of the anion exchange resin regeneration solution W16 becomes the second temperature T2. When the regeneration temperature control unit 17B determines that F2> Fr, the flow control unit 17A switches from the water treatment mode to the regeneration mode and forcibly regenerates the anion exchange resin bed.

  Next, operation | movement of 1 C of water treatment systems of 4th Embodiment is demonstrated, referring the flowchart of FIG. FIG. 8 is a flowchart of the operation of the water treatment system 1C.

Steps ST401 to ST403 in FIG. 8 are the same as steps ST301 to ST303 in FIG.
In step ST404, the regeneration temperature control unit 17B obtains the integrated silica inflow value FL2 from the integrated silica inflow calculation unit 21.

  In step ST405, the regeneration temperature control unit 17B compares the integrated silica inflow value FL2 with the second reference integrated silica inflow value FL02 set and held in advance. If regeneration temperature control unit 17B determines that FL2> FL02 (YES), the process proceeds to step ST406. If the regeneration temperature control unit 17B determines that FL2> FL02 is not satisfied (NO), the process proceeds to step ST407.

  Steps ST406, ST407, and ST413 are the same as steps ST308, ST309, and ST313 in FIG.

  In step ST408, the flow control unit 17A determines whether or not a predetermined transition condition (regeneration start condition) is satisfied, for example, whether the cation exchange column flow switching valve 12A and the anion exchange column flow switching valve 12B are predetermined. It is determined whether or not it has been operated in the water treatment mode for a period of time. Alternatively, for example, it may be determined whether or not the amount of the treated water W13 in the water treatment mode has reached a predetermined amount. If distribution control unit 17A determines that the predetermined transition condition is satisfied (YES), the process proceeds to step ST409. When distribution control unit 17A does not determine that the predetermined transition condition is satisfied (NO), the process returns to step ST402 and continues the operation in the water treatment mode.

  The processes in steps ST409 and ST410 are the same as the processes in steps ST310 and ST311 in FIG. After step ST410, the process proceeds to step ST411.

In step ST411, the regeneration temperature control unit 17B determines whether regeneration has been executed by setting the regeneration solution W16 for anion exchange resin to the second temperature T2 in the regeneration mode. When the regeneration temperature control unit 17B determines that regeneration is performed by setting the regeneration solution W16 for anion exchange resin to the second temperature T2, the process proceeds to step ST412. In step ST412, the regeneration temperature control unit 17B resets the integrated silica inflow amount value FL2 of the integrated silica inflow amount calculating unit 21 to an initial value (for example, “0”). After the regeneration temperature control unit 17B resets the integrated silica inflow value FL2 of the integrated silica inflow calculation unit 21, the process returns to step ST401 and starts the operation in the water treatment mode again. In step ST411, the regeneration temperature control unit 17B did not perform regeneration by setting the regeneration solution W16 for anion exchange resin to the second temperature T2 (that is, performed regeneration by setting the first temperature T1). ), The integrated silica inflow amount value FL2 of the integrated silica inflow amount calculation unit 21 is not reset, the process returns to step 401, and the operation in the water treatment mode is started again.

  As described above, the integrated silica inflow amount calculation unit 21 is configured such that the temperature adjustment unit 16 adjusts the temperature of the anion exchange resin regenerating liquid W16 to the second temperature, and then adds the cation exchange column flow switching valve 12A and the anion exchange channel switching valve 12A. It is reset only when the ion exchange tower flow path switching valve 12B is switched to the regeneration mode. Therefore, as long as the temperature adjustment unit 16 adjusts the temperature of the anion exchange resin regenerating liquid W16 to the first temperature, the integrated silica inflow amount calculation unit 21 is not reset. Therefore, as long as the temperature adjustment unit 16 in the water treatment system 1C of the fourth embodiment adjusts the temperature of the anion exchange resin regenerating liquid W16 to the first temperature T1, the integrated silica inflow value FL2 increases. It is a value to continue.

  Therefore, the second reference cumulative silica inflow value FL02 is determined based on the following idea. When the anion exchange resin is regenerated by the anion exchange resin regenerating liquid W16 at the first temperature T1, the adsorbed silica is desorbed, but a part of the silica remains in the anion exchange resin. . The amount of residual silica accumulates depending on the cumulative silica inflow. When the amount of accumulated residual silica exceeds an allowable amount, the anion exchange resin bed is regenerated by the anion exchange resin regenerating liquid W16 adjusted at the second temperature T2, and the accumulated residual silica is recovered. It is desirable that it be removed sufficiently. Therefore, the value FL02 of the second reference cumulative silica inflow amount is appropriately determined according to the amount of residual silica allowed to accumulate in the anion exchange resin bed.

  In step ST405, the regeneration temperature control unit 17B compares the accumulated silica inflow value FL2 with the second reference accumulated silica inflow value FL02 set and held in advance as follows. . When FL2> FL02 (YES), the amount of residual silica accumulated in the anion exchange resin bed of the anion exchange column 11B is estimated to exceed the allowable amount. When the allowable amount is exceeded, it is considered that the anion exchange resin bed of the anion exchange tower 11B does not sufficiently desorb the adsorbed silica in the regenerated liquid W16 for the anion exchange resin at the first temperature T1. Therefore, the process of step ST405 is performed in order to estimate whether the amount of residual silica accumulated in the anion exchange resin bed of the anion exchange column 11B exceeds the allowable amount.

  In the water treatment system 1C of the fourth embodiment, even if the treated water silica concentration measuring unit 15 is not provided, the silica adsorption amount estimation information output unit (raw water silica concentration measuring unit 14, raw water electrical conductivity measuring unit). This is because the amount of silica adsorbed on the anion exchange resin bed of the anion exchange column 11B is estimated by using the No. 18 and the raw water silica ratio calculation unit 19). When the treated water silica concentration measurement unit 15 is not provided, step ST402, step ST403, and step ST416 are omitted in FIG.

  Further, in the operation of the water treatment system 1C of the fourth embodiment, as shown in FIG. 9, when it is determined in step ST405 that FL2> FL02 is satisfied (YES), after passing through step ST406, step ST409 is performed. You may make it transfer to. According to the flowchart of FIG. 9, when it is determined that the amount of residual silica accumulated in the anion exchange resin bed of the anion exchange column 11B has exceeded the allowable amount, heating regeneration (regeneration at the second temperature T2) is immediately performed. Is executed. Thus, the anion exchange resin bed is always managed so that the amount of accumulated residual silica does not exceed a certain amount. On the other hand, if it is not determined that the amount of residual silica accumulated in the anion exchange resin bed exceeds the allowable amount, normal temperature regeneration (regeneration at the first temperature T1) is performed when a predetermined transition condition (regeneration start condition) is satisfied. ) Will be executed.

  Moreover, although the temperature adjustment part 16 adjusted the temperature of the regenerated liquid W16 for anion exchange resin, you may make it adjust the temperature of the anion exchange resin bed of the anion exchange tower 11B.

  According to the water treatment system 1C of the fourth embodiment, the amount of silica adsorbed on the anion exchange resin bed of the anion exchange tower 11B can be estimated based on the value of the accumulated silica inflow amount. Then, based on the estimated amount of silica, it is determined whether to adjust the regenerated liquid W16 for anion exchange resin to the first temperature T1 or the second temperature T2. Since the first temperature T1 is lower than the second temperature T2, the energy consumed when adjusting the temperature of the anion exchange resin regenerating liquid W16 is suppressed. Further, when the treated water silica concentration measurement unit 15 is provided, regeneration can be performed by adjusting the temperature of the anion exchange resin regeneration solution W16 to the second temperature at a more appropriate timing.

  Next, the structure of the raw water silica concentration measuring unit 14 (silica concentration sensor) will be described with reference to FIGS. 10 and 11. The raw water silica concentration measuring unit 14 is a device that measures the silica concentration of the raw water W11 by the molybdenum yellow method (molybdenum yellow absorptiometry). Here, for convenience of explanation, the raw water W11 measured by the raw water silica concentration measuring unit 14 will be described as the inspection water W101. The treated water silica concentration measuring unit 15 has the same configuration as the raw water silica concentration measuring unit 14.

  The raw water silica concentration measurement unit 14 can measure a low concentration silica concentration and a high concentration silica concentration by switching the measurement wavelength. As shown in FIG. 10, the raw water silica concentration measurement unit 14 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, and a sensor display unit 160. And a sensor control unit 110, a test water introduction line L101, and a test water discharge line L102.

  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. 10, the inspection water introduction line L <b> 101 is connected to a 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 device 17.

  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. 10, the inspection water discharge line L102 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).

  The roller pump mechanism 132 is provided above the measurement cell 120 as shown in FIG. 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. 10, 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. 10, 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 test water W101, the operation status of the raw water silica concentration measurement unit 14, 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 device 17 and controlled by the control device 17. 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. 11) 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. 11). The first time t1 is preferably within 3 minutes after the reagent W102 is added to the test water W101. Note that the first time t1 is a time close to immediately after the addition of the specified amount of the reagent W102 is completed within a range where the addition of the specified amount of the reagent W102 can be performed. In the present embodiment, the first time t1 is about 2 minutes (see FIG. 11). If 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. 11). 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. 11).

  The timer 113 measures the second time t2. At the second time t2 measured 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 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. The difference between the absorbance A1 and the absorbance A2 of the test water W101 after the second time t2 longer than the first time t1 since the addition of the reagent W102, that is, the difference A2-A1 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 silica concentration sensor can be used as the raw water silica concentration measuring unit 14 by setting the measurement range to a high concentration range, while the treated water silica concentration measuring unit 15 is set by setting the measurement range to a low concentration range. Can be used as.

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

  In the first to fourth embodiments, the ion exchange device 11 is a two-bed, two-column type ion exchange device, but a decarboxylation tower is provided between the cation exchange column 11A and the anion exchange column 11B. Alternatively, a so-called two-bed / three-column type ion exchange apparatus may be used. Moreover, a mixed bed type ion exchange apparatus may be used. Further, it may be a single tower type ion exchange apparatus having only an anion exchange resin bed without having a cation exchange resin bed.

In 1st Embodiment-4th Embodiment, although the temperature adjustment part 16 was provided in the regenerated liquid supply line L16 for anion exchange resins, it is not limited to this position. For example, the temperature adjusting unit 16 may be provided in the anion exchange resin regenerating liquid tank 13B.
In the first to fourth embodiments, the temperature adjustment unit 16 adjusts the temperature of the anion exchange resin regenerating liquid W16 or the temperature of the anion exchange resin bed of the anion exchange tower 11B. The temperature of the anion exchange resin regenerating liquid W16 and the temperature of the anion exchange resin bed of the anion exchange tower 11B may be adjusted.

  In 1st Embodiment-4th Embodiment, although the raw | natural water silica concentration measurement part 14 was provided in the raw | natural water supply line L11, you may be provided in the water flow line L12. This is because in the cation exchange tower 11A, silica adsorption to the cation exchange resin bed does not occur, so the silica concentration of the raw water W11 and the silica concentration of the cation-removed water W12 are equal.

  In 1st Embodiment-4th Embodiment, although the raw | natural water flow measurement part 20 was provided in the raw | natural water supply line L11, you may be provided in the water flow line L12 or the treated water line L13. This is because when both the cation exchange column 11A and the anion exchange column 11B are operating in the water flow mode, the flow rate of the raw water W1, the flow rate of the cation removal water W12, and the flow rate of the treated water W13 are the same.

1, 1A, 1B, 1C Water treatment system 11 Ion exchange device 12 Distribution section (distribution means)
14 Raw water silica concentration measurement part (silica adsorption amount estimation information output part)
15 treated water silica concentration measuring part 16 temperature adjusting part 17A flow control part (flow control means)
17B Regeneration temperature control unit 18 Raw water electrical conductivity measurement unit (silica adsorption amount estimation information output unit)
19 Raw water silica ratio calculation part (silica adsorption amount estimation information output part)
20 Raw water flow rate measurement unit (silica adsorption amount estimation information output unit)
21 Integrated silica inflow calculation unit (silica adsorption amount estimation information output unit)
22 Treated water electrical conductivity measurement unit W11 Raw water W13 Treated water

Claims (7)

An ion exchange device having an anion exchange resin bed;
Distribution means having 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 bed by introducing a regeneration solution into the ion exchange device. When,
Distribution control means for controlling the distribution means to switch between the water treatment mode and the regeneration mode based on a predetermined transition condition;
A raw water silica concentration measuring unit for measuring the silica concentration of raw water, and in the water treatment mode, estimation information for estimating a silica adsorption amount of the anion exchange resin bed, wherein the raw water silica concentration measuring unit A silica adsorption amount estimation information output unit that outputs estimation information based on the measured silica concentration of the raw water;
A temperature adjusting unit for adjusting the temperature of the regenerated liquid or the anion exchange resin bed;
Based on the estimation information output from the silica adsorption amount estimation information output unit, the temperature adjustment unit so that the temperature of the regeneration solution or the anion exchange resin bed becomes a predetermined temperature when the regeneration mode is executed. A regeneration temperature control unit for controlling
A water treatment system comprising. When the silica concentration measured by the raw water silica concentration measuring unit is equal to or lower than a reference raw water silica concentration, the regeneration temperature control unit is configured so that the temperature of the regeneration liquid or the anion exchange resin bed becomes a first temperature. When the silica concentration measured by the raw water silica concentration measuring unit is greater than the reference raw water silica concentration, the adjustment unit is controlled, and the temperature of the regenerated liquid or the anion exchange resin bed is higher than the first temperature. The water treatment system of Claim 1 which controls the said temperature adjustment part so that it may become 2 temperature. The silica adsorption amount estimation information output unit has a raw water electrical conductivity measurement unit that measures the electrical conductivity of raw water, and a raw water silica ratio calculation unit that calculates the silica ratio of raw water,
The silica ratio of the raw water is [raw water silica concentration / (raw water silica concentration + raw water electrical conductivity / 2 × conversion coefficient)] (however, raw water silica concentration: raw water silica concentration measured by the raw water silica concentration measuring unit, raw water Electrical conductivity: calculated by the raw water electrical conductivity measured by the raw water electrical conductivity measurement unit, conversion factor: a predetermined constant),
The estimation information includes a silica ratio of the raw water,
When the silica ratio calculated by the raw water silica ratio calculation unit is equal to or lower than a reference raw water silica ratio, the regeneration temperature control unit is configured so that the temperature of the regeneration liquid or the anion exchange resin bed becomes a first temperature. When the control unit is controlled and the silica ratio measured by the raw water silica ratio calculation unit is larger than the reference raw water silica ratio, the temperature of the regenerated liquid or the anion exchange resin bed is higher than the first temperature. The water treatment system of Claim 1 which controls the said temperature adjustment part so that it may become 2 temperature. A treated water electrical conductivity measuring unit for measuring the electrical conductivity of the treated water;
The silica adsorption amount estimation information output unit has a raw water flow rate measurement unit that measures the flow rate of raw water, and an integrated silica inflow amount calculation unit that calculates an integrated silica inflow amount,
The cumulative silica inflow amount is calculated by the product of the raw water silica concentration measured by the raw water silica concentration measuring unit and the raw water flow rate measured by the raw water flow measuring unit,
The estimation information includes the accumulated silica inflow amount,
The regeneration temperature control unit, when the electrical conductivity measured by the treated water electrical conductivity measurement unit is larger than a standard treated water electrical conductivity, the accumulated silica inflow amount calculated by the integrated silica inflow rate calculation unit Is less than or equal to the first reference cumulative silica inflow, the temperature adjusting unit is controlled so that the temperature of the regenerated liquid or the anion exchange resin bed becomes the first temperature, and the treated water electrical conductivity measuring unit measures In the case where the electrical conductivity is larger than the reference treated water electrical conductivity, the regeneration is performed when the cumulative silica inflow amount calculated by the cumulative silica inflow amount calculation unit is larger than the first reference cumulative silica inflow amount. The electric conductivity measured by the treated water electric conductivity measuring unit by controlling the temperature adjusting unit so that the temperature of the liquid or the anion exchange resin bed becomes a second temperature higher than the first temperature. If is less than the reference treatment water electric conductivity, the controlling the temperature adjustment unit so that the regenerant or the temperature of the anion exchange resin bed becomes the first temperature,
The regeneration temperature control unit sets the integrated silica inflow amount calculated by the integrated silica inflow amount calculation unit to a predetermined initial value every time the distribution control unit switches the distribution unit from the water treatment mode to the regeneration mode. The water treatment system according to claim 1 to be reset. The silica adsorption amount estimation information output unit has a raw water flow rate measurement unit that measures the flow rate of raw water, and an integrated silica inflow amount calculation unit that calculates an integrated silica inflow amount,
The cumulative silica inflow amount is calculated by the product of the raw water silica concentration measured by the raw water silica concentration measuring unit and the raw water flow rate measured by the raw water flow measuring unit,
The estimation information includes the accumulated silica inflow amount,
When the integrated silica inflow amount calculated by the integrated silica inflow amount calculation unit is equal to or less than a second reference integrated silica inflow amount, the regeneration temperature control unit determines that the temperature of the regeneration liquid or the anion exchange resin bed is a first temperature. And when the integrated silica inflow amount calculated by the integrated silica inflow amount calculation unit is larger than the second reference integrated silica inflow amount, the regeneration solution or the anion exchange resin Controlling the temperature adjusting unit so that the temperature of the floor becomes a second temperature higher than the first temperature;
When the regeneration temperature control unit controls the temperature adjustment unit so that the temperature of the regeneration solution becomes the second temperature, the circulation control unit switches the circulation unit from the water treatment mode to the regeneration mode. 2. The water treatment system according to claim 1, wherein the regeneration temperature control unit resets the integrated silica inflow amount calculated by the integrated silica inflow amount calculation unit to a predetermined initial value. 6. The water treatment system according to claim 5, wherein when the integrated silica inflow amount is larger than the second reference integrated silica inflow amount, the flow control means switches the flow means from the water treatment mode to the regeneration mode. A treated water silica concentration measuring unit for measuring the treated water silica concentration;
When the silica concentration measured by the treated water silica concentration measuring unit is larger than the reference treated water silica concentration, the regeneration temperature control unit sets the temperature of the regenerated liquid or the anion exchange resin bed to the second temperature. The water treatment system according to any one of claims 2 to 6, wherein the temperature adjustment unit is controlled and the flow control means switches from the water treatment mode to the regeneration mode.

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