KR20190046718A - Operation method of water quality management system and water quality management system - Google Patents

Abstract

A regeneration type ion exchange device 1, a water quality measuring device 2 having an ion concentration meter 22 and a first discharge pipe 3 for distributing treated water W1 discharged from the regenerative ion exchanger 1, And a second discharge pipe 4 branched from the first discharge pipe 3 via the automatic valve 5 and supplying the treated water W1 to the water quality measuring device 2, ). According to this water quality management system, it is possible to stably lower the concentration of sodium ions (Na ⁺ ) or chloride ions (Cl ^- ) in the treated water discharged from the regenerative ion exchange apparatus used in the primary pure water system of the ultrapure water producing apparatus Therefore, it is possible to suppress the short-term fluctuation of the sodium ion (Na ⁺ ) concentration or the chloride ion (Cl ^- ) concentration in the treatment water discharged from the non-raw material ion exchange apparatus used in the downstream subsystem.

Description

Operation method of water quality management system and water quality management system

The present invention relates to a regeneration type ion exchange apparatus, and particularly to a regeneration type ion exchange apparatus for use in a primary pure water system of an ultrapure water production apparatus used in the process of manufacturing an electronic product, And a method of operating the system.

The ultrapure water producing apparatus is generally constituted by a pretreatment system, a primary pure water system, and a secondary pure water system (subsystem). The pretreatment system has a device for coagulation, pressurization (sedimentation), filtration (membrane filtration), etc., and removes suspended substances and colloidal substances in raw water. In the treatment process by the pretreatment system, polymer-based organic substances, hydrophobic organic substances and the like may be removed. The primary pure water system is basically equipped with a reverse osmosis (RO) membrane separator and a regenerative ion exchanger (mixed bed type or four-phase five-column type). In the RO membrane separator, salts are removed and ionic and colloidal TOC components are removed. In the regenerative ion exchanger, the salt is removed and the TOC component adsorbed or ion-exchanged by the ion exchange resin is also removed.

The sub-system basically comprises a low-pressure ultraviolet (UV) oxidizer, a non-regenerative mixed-bed ion exchange device, and an ultrafiltration (UF) membrane separator to produce ultrapure water by further increasing the purity of the primary pure water. In the low pressure UV oxidation apparatus, the TOC component is decomposed to organic acid and further to CO ₂ by ultraviolet rays of 185 nm emitted from a low-pressure ultraviolet lamp. The organic matter and CO ₂ produced by the decomposition are removed by a non-regenerating mixed-bed type ion exchange apparatus at the subsequent stage. In the UF membrane separation apparatus, the fine particles are removed, and the outflow particles of the ion exchange resin are also removed.

In the ultrapure water producing apparatus as described above, the regenerative ion exchange apparatus used in the primary pure water system is composed of a plurality of towers including one tower or a degassing apparatus depending on the quality of water to be treated, It is common to have a reverse osmosis (RO) membrane device. At the downstream end of the regenerative ion exchanger, a subsystem having a non-regenerative ion exchanger is formed.

Conventionally, in the regenerative ion exchange apparatus as described above, ions are removed from the water electrochemically while repeating the collection and regeneration. Regeneration refers to regeneration of an ion exchange resin such as anion exchange resin or cation exchange resin charged in an ion exchange apparatus in the presence of hydrochloric acid (HCl) or sodium hydroxide NaOH), and the like. Since the ion concentration of the treated water treated with the ion exchange apparatus that mainly removes the ions in the for-treatment water is determined according to the ion concentration of the supplied water to be treated and the treated amount (space velocity and linear velocity) In the regenerative ion exchange apparatus as described, a threshold value is set for the resistivity (or electrical conductivity) of the treated water, and regeneration of the ion exchange resin is carried out by the regenerating agent at a point of time when the threshold value is exceeded. However, sodium ions (Na < ^{+ &} gt ^; ) or chloride ions (Cl < ^- >) are present in the water treated at the time of water collection after ions are removed due to the regenerating agent remaining in the ion-

Recently, in the non-production type ion exchange apparatus used in the subsystem, short-term fluctuation of the sodium ion (Na ⁺ ) concentration or the chloride ion (Cl ^- ) concentration in the treated water becomes present, It has been found that when water is used for washing semiconductor products, the yield of the produced semiconductor products may be lowered.

As a result, the inventors of the present invention have investigated the cause of the fluctuation of the sodium ion (Na ⁺ ) concentration and the chloride ion (Cl ^- ) concentration in the treated water discharged from the above-described regenerative ion exchanger, The sodium ion (Na ⁺ ) or chloride ion (Cl ^- ) concentration of the treated water in the regenerative ion exchanger used in the system affects the water quality of the treated water of the non - I was able to find out what was going on.

The present invention is regenerative sodium ions in the treated water discharged from the ion exchanger (Na ⁺⁾ and chloride ion (Cl ^-) used in the primary pure water system of a pure water manufacturing apparatus to be made in view of the above problems, stable concentrations of (Na ⁺ ) concentration or chloride ion (Cl ^- ) concentration in the treated water discharged from the non-raw material ion exchange apparatus used in the downstream subsystem, Management system and a method of operating a water quality management system.

In order to solve the above-described problems, first, the present invention provides a regeneration type ion exchange apparatus comprising a regeneration type ion exchange apparatus, a water quality measurement apparatus having an ion concentration meter, a first discharge pipe for circulating treated water discharged from the regenerative ion exchange apparatus, And a second discharge pipe branched from the first discharge pipe and supplying the treated water to the water quality measuring device (Invention 1).

According to the invention (invention 1), not only the resistivity of the treated water discharged from the regenerative ion exchanger but also the ion concentration can be measured by the water quality measuring device, and therefore, It is possible to stably lower the ion concentration in the treated water and to suppress short-term fluctuations in the ion concentration in the treated water discharged from the non-raw material ion exchange apparatus used in the downstream subsystem. Further, the water quality measuring device is not formed on the first discharge pipe, but is connected to the second discharge pipe branched from the first discharge pipe via the automatic valve, for example, It is possible to easily measure the quality of the treated water at the timing corresponding to the timing of the process.

In the above invention (Invention 1), when the regenerative ion exchange apparatus has a plurality of regenerable ion exchange columns, the effluent flowing out from the regenerative ion exchange column at the rearmost end of the regenerative ion exchanger It is preferable to use treated water (invention 2).

In the case where the regenerative ion exchange apparatus has a plurality of regenerable ion exchange columns, in order to lower the concentration of ions in the for-treatment water flowing into the downstream subsystem, the ion concentration . According to the invention (invention 2), the ion concentration (and the low efficiency) is measured using the effluent of the last-stage regenerative ion exchange column as the treated water, and the adequacy of regeneration of the ion exchange resin It is possible to stably lower the ion concentration in the treated water and to suppress short-term fluctuations in the ion concentration in the treated water discharged from the non-raw material ion exchange apparatus used in the downstream subsystem.

In the above invention (inventions 1 and 2), there is provided an automatic switching control means for automatically switching an operation mode including a watering mode for collecting the treated water and a regeneration mode for regenerating the regenerative ion exchange apparatus And the automatic switching control means performs the automatic switching control of the operating mode according to the measured value of the water quality measuring device (invention 3).

According to this invention (invention 3), the ion concentration (and the low efficiency) of the treated water discharged from the regenerative ion exchanger is measured by a water quality measuring device, and the operation mode of the regenerative ion exchanger The regeneration mode of the regeneration type ion exchange apparatus can be appropriately controlled and the concentration of ions in the for-treatment water flowing into the downstream subsystem can be controlled.

In the above invention (invention 1-3), the regenerative ion exchanger formed in parallel with N (N is an integer of 2 or more) and the water quality measuring apparatus formed in parallel with N or less are provided , And each treated water discharged from each of the N regenerative ion exchange apparatuses is configured to be supplied to each of the N or less water quality measuring apparatuses (invention 4).

Conventionally, the ion concentration meter for measuring the ion concentration has a deviation in the concentration range of several hundred ng / liter level in the measured value depending on the individual difference. Therefore, when a plurality of regenerative ion exchange apparatuses are formed in parallel, if an ion concentration meter is formed to measure the ion concentration of the treated water for each series, time is required for calibration and cross-checking of each ion concentration meter, There has been a situation where the management of the quality of the treated water can not be appropriately carried out at the timing according to necessity. According to the invention (invention 4), even when the regenerative ion exchanger is formed in parallel with N (N is an integer of 2 or more), it is possible to perform a specific regenerative ion exchange (Water quality measuring device) is provided for each of the regenerative ion exchange apparatuses, it is possible to simplify the management of the quality of the treated water and to perform the treatment for suppressing the ion concentration It is possible to stably enter the downstream subsystem. In addition, since the water quality of a plurality of regenerative ion exchange apparatuses can be managed by one water quality management system, there is no need to form an ion density meter (water quality measuring apparatus) for each regenerative ion exchange apparatus, Big. This effect is remarkable particularly when the number of water quality measuring devices is smaller than the number of regenerative ion exchange devices.

Secondly, the present invention provides a method for operating a water quality management system according to any one of the first to fourth aspects of the present invention, comprising the steps of: measuring the ion concentration of the treated water by the ion concentration meter; And a step of automatically switching and controlling a watering mode for collecting the treated water and a regeneration mode for regenerating the regenerative ion exchange apparatus based on the value of the water quality management system.

According to the invention (invention 5), not only the resistivity of the treated water discharged from the regenerative ion exchanger but also the ion concentration can be measured. Therefore, the operation mode is automatically switched to the water sampling mode or the regeneration mode Lt; / RTI > Therefore, even when the regenerative ion exchange apparatus has a plurality of regenerative ion exchange columns or a plurality of the regenerative ion exchange columns are formed in parallel, it is possible to appropriately manage the quality of the water to be treated, It is possible to suppress the short-term fluctuation of the ion concentration in the treated water discharged from the ion exchange apparatus.

According to the present invention, not only the resistivity of the treated water discharged from the regenerative ion exchange apparatus but also the ion concentration can be measured by the water quality measuring apparatus, and therefore, by appropriately managing the regeneration of the ion exchange resin based on the measured value, It is possible to stably lower the ion concentration in the treated water and thus to suppress the short-term fluctuation of the ion concentration in the treated water discharged from the non-raw material ion exchange apparatus used in the downstream subsystem. In addition, the water quality measuring device is not formed on the first discharge pipe but connected to the second discharge pipe branched from the first discharge pipe through the automatic valve, whereby the timing It is possible to easily measure the quality of the treated water.

1 is a schematic diagram showing a water quality management system according to a first embodiment of the present invention. In Fig. 1, the water quality management system is provided with the regenerative ion exchange apparatus of the first example.
2 is a schematic diagram showing a water quality management system according to a second embodiment of the present invention. In Fig. 2, the indication of the regenerative ion exchanger of each series is omitted.
3 is a schematic diagram showing a second example of a regenerative ion exchanger provided in the water quality management system of the present invention.
4 is a schematic diagram showing a third example of a regenerative ion exchanger provided in the water quality management system of the present invention.
5 is a schematic diagram showing a fourth example of the regenerative ion exchanger provided in the water quality management system of the present invention.
6 is a schematic diagram showing a fifth example of a regenerative ion exchanger provided in the water quality management system of the present invention.
7 is a schematic diagram showing a sixth example of the regenerative ion exchanger provided in the water quality management system of the present invention.

 Hereinafter, embodiments of the water quality management system of the present invention will be described with reference to the drawings as appropriate. The embodiments described below are for the purpose of facilitating understanding of the present invention and are not intended to limit the present invention at all.

[First Embodiment]

1 is a schematic diagram showing a water quality management system 10 according to a first embodiment of the present invention. 1, the water quality management system 10 includes a regenerative ion exchanger 1, a water quality measuring device 2 having a resistivity meter 21 and an ion density meter 22, And a second outlet pipe 4 for supplying the ion exchange water W1 to the water quality measuring device 2. The first outlet pipe 3 communicates the ion exchange water W1 discharged from the ion exchange water W1, And the second discharge pipe (4) is branched from the first discharge pipe (3) via the automatic valve (5). The water quality management system 10 is also provided with a water supply mode for automatically switching the operation mode including the water intake mode for taking in the ion exchange water W1 and the regeneration mode for regenerating the regenerative ion exchanger 1 And a switching control means (not shown). In the first embodiment, the regenerative ion exchanger 1 provided in the water quality management system 10 is a first example of the regenerative ion exchanger.

<Regenerative Ion Exchange Apparatus>

In the present embodiment, the regenerative ion exchange column 11 constituting the regenerative ion exchanger 1 has a cylindrical exchange column main body 111 in which a mixed resin of a cation exchange resin and an anion exchange resin The ion-exchange resin layer 12 is disposed. The upper portion of the exchange column main body 111 is connected to a supply pipe 6 for supplying the pretreating water W for performing the ion exchange treatment while a lower portion of the first discharge pipe 3 And the second discharge pipe 4 is connected to the first discharge pipe 3 via the automatic valve 5. [ Further, the first discharge pipe 3 is connected to a sub-system (not shown) at the rear end. The pretreatment water W is supplied to the subsystem via the first discharge pipe 3 as the ion exchange treated water W1 after the ion component is removed by the regenerative ion exchanger 1. The ultra-pure water produced in the subsystem is supplied to the use point, and is used for cleaning in the process of manufacturing an electronic product or the like.

To the supply pipe 6, a first chemical liquid supply pipe 7 for supplying an aqueous solution of sodium hydroxide (NaOH) as alkali, which is a regenerated chemical liquid, is connected. A second chemical liquid supply pipe 8 for supplying hydrochloric acid (HCl) as an acid as a regenerant chemical liquid is connected to the first discharge pipe 3 on the upstream side of the automatic valve 5. A regeneration waste water discharge pipe 9 for discharging waste water at the time of regeneration is connected to the side of the exchange column body 111. An opening / closing valve (not shown) is connected to each of the first discharge pipe 3, the second discharge pipe 4, the supply pipe 6, the first chemical liquid supply pipe 7, the second chemical liquid supply pipe 8 and the regeneration waste water discharge pipe 9, Respectively. In the present embodiment, a heater (plate heat exchanger) 71 is formed in the first chemical liquid supply pipe 7.

(Cation exchange resin)

In the regenerative ion exchanger 1, the cation exchange resin constituting the ion exchange resin layer 12 is preferably a strongly acidic cation exchange resin having a sulfone group as a cation exchanger, a weak acid cation exchange resin having a carboxylic acid group Gel resins are generally used because they are both usable and have a low elution of PSA. Further, in the above-mentioned cation exchange resin, since divinylbenzene serves as a crosslinking agent and the chain-like structure is crosslinked to form a network-like resin, the number of branches of the chain increases as the number of divinylbenzene increases, When the amount of divinylbenzene is small, a resin having a large molecular weight with a small number of branches is obtained. A resin used for ordinary water treatment has a degree of crosslinking of about 8% and is called a standard crosslinking resin. On the other hand, those having a degree of crosslinking of 9% or more are referred to as high-bridging resins. In the present embodiment, both standard crosslinked resins and high-crosslinked resins can be used, but standard crosslinked resins can be preferably used.

(Anion exchange resin)

As the anion exchange resin constituting the ion exchange resin layer 12, a gel resin is used in view of the less elution of PSA. A styrene-divinylbenzene copolymer, and the like, a strongly basic anion exchange resin having a quaternary ammonium group such as a trimethylammonium group or a dimethylethanolammonium group, a styrene-divinylbenzene copolymer having a styrene- Or a weakly basic anion exchange resin having a primary or tertiary amino group as a functional group in a polyacrylate ester skeleton can be used, but strongly basic anion exchange resins can be preferably used. The exchanger of the anion exchange resin is preferably of the OH type.

The mixing ratio of the cation exchange resin and the anion exchange resin in the mixed resin constituting the ion exchange resin layer 12 is preferably 30:70 to 70:30 in the ratio of the cation exchange resin to the anion exchange resin , Particularly preferably 30:70 to 50:50, by mixing a large amount of anion exchange resin. The physical properties of the ion exchange resin constituting the ion exchange resin layer 12 are not particularly limited as long as they are granular.

(Regenerative ion exchange column)

The material of the regenerative ion exchange column 11 is not particularly limited as long as it is resistant to the regenerating agent of the ion exchange resin.

<Water quality measuring device>

In the present embodiment, the water quality measuring apparatus 2 has a resistivity meter 21 and an ion density meter 22 in this order. The water quality measuring device 2 has a second automatic valve 24 in the piping between the resistivity meter 21 and the ion density meter 22. A first wastewater discharge pipe 26 for discharging the wastewater after measuring the resistivity by the resistivity meter 21 to the outside of the system is connected to the piping between the resistivity meter 21 and the second automatic valve 24, 23 are formed. A second wastewater discharge pipe 27 for discharging the wastewater discharged from the water quality measuring device 2 to the outside of the system is formed on the downstream side of the ion concentration meter 22 via a third automatic valve 25.

(Resistivity meter)

The resistivity meter 21 constituting the water quality measuring device 2 measures the resistivity of the ion-exchanged water W1. The kind of the resistivity meter 21 is not particularly limited. For example, the resistivity of the ion-exchanged water W1 may be measured by a commercially available electric resistivity meter. The material of the measuring cell of the resistivity meter 21 is not particularly limited as long as the concentration of ions to be measured does not elute by 20 ng / liter or more when pure water is passed at 1 liter / min.

(Ion concentration meter)

The ion concentration meter 22 constituting the water quality measuring apparatus 2 measures the ion concentration of the ion exchange treated water W1. The kind of the ion density meter 22 is not particularly limited, but in the present embodiment, the ion concentration of the ion-exchanged water W1 is measured by the sodium ion electrode. The material of the measurement cell of the ion concentration meter 22 is not particularly limited as long as the concentration of the ion to be measured does not elute by 20 ng / liter or more when pure water is passed at 1 liter / min.

<Automatic switching control means>

The automatic switching control means carries out the switching control of the operation mode in accordance with the measured value of the water quality measuring device (2). Specifically, in the water sampling mode, the resistivity of the ion-exchanged water W1 is measured by the resistivity meter 21. When the measured value exceeds the preset threshold value in the resistivity meter 21, It is determined that the ion exchange capacity of the ion exchange resin layer 12 has decreased, and switching to the regeneration mode is performed. In the regeneration mode, the concentration of sodium ions (Na ⁺ ) contained in the ion-exchanged water W1 is measured by an ion density meter 22, and the measured value is compared with a threshold value Or less, it is determined that the reproduction is appropriate, the reproduction process is terminated, and the conversion to the reception mode is performed.

(Regenerating medicine)

In the present embodiment, sodium hydroxide (NaOH) and hydrochloric acid (HCl) are used as medicines for regeneration of the ion exchange resin filled in the exchange column body 111 of the regenerative ion exchange column 11, But the present invention is not limited thereto as long as the performance of the ion exchange resin can be regenerated without significantly lowering the performance.

(Preprocessing water)

There is no particular limitation on the quality of the water of the pretreated water W because the processing method of the raw water differs from the required water quality of the ultrapure water used in the process of manufacturing electronic products and the like. The raw water of the pretreated water W is not particularly limited.

(pipe)

The material of the piping such as the first discharge pipe 3 used in the water quality management system 10 is not particularly limited as long as the concentration of the ion to be measured does not exceed 20 ng / It is not limited.

(Automatic valve)

The specifications of the automatic valve used in the water quality management system 10 are not particularly limited as long as the concentration of the ion to be measured does not exceed 20 ng / liter when pure water is passed at 1 liter / min.

[Operation method of water quality management system]

Next, the operation method of the water quality management system 10 of the first embodiment described above will be described. Hereinafter, the "collection mode" means an operation mode at the time of collection of the ion exchange water W1 discharged from the regenerative ion exchange apparatus 1, and the "regeneration mode" means a regenerative ion exchange apparatus 1) at the time of regeneration of the ion exchange resin layer 12.

<Feeding mode>

After the supply pipe 6 and the first discharge pipe 3 are opened, the first chemical liquid supply pipe 7, the second chemical liquid supply pipe 8 and the regeneration waste water discharge pipe 9 are closed in the water collection mode, In the discharge pipe 3, the pre-treatment water W is discharged from the supply pipe 6 to the regeneration type ion exchange column (lower flow path) while the automatic valve 5 allows the flow to the second discharge pipe 4 11). As the pretreated water W supplied, the cationic component and the anionic component are removed in the ion exchange resin layer 12 which is a mixed resin filled in the regenerative ion exchange column 11 (ion exchange step). The pretreated water W from which the ion component has been removed is supplied to the downstream subsystem via the first discharge pipe 3 as the ion exchange treated water W1 and is supplied to the water quality measuring device 2 . The water flow condition at this time can be the same as that of the ordinary ion exchange treatment, and the flow rate of the ion exchange resin in the ion exchange resin layer 12 is 5 to 100 h ^-1 , 50 h ^-1 .

In the water quality measuring apparatus 2, the ion exchange water W1 is supplied from the second discharge pipe 4 to the resistivity meter 21). The resistivity meter 21 is used to measure the resistivity of the ion exchange water W1 passed through the column (resistivity measuring step). The ion exchange water W1 after the resistivity measurement is discharged to the outside of the system via the first waste water discharge pipe 26. [ The automatic switching control means judges that the ion exchange capacity of the ion exchange resin layer 12 has deteriorated when the resistivity of the ion exchange water W1 has exceeded a preset threshold value, Conversion is carried out. The flow rate of the ion exchange water W1 discharged from the regenerative ion exchanger 1 to the water quality measuring device 2 is preferably 1 l / min or more, more preferably 1.5 l / min.

<Playback mode>

In the regeneration mode, first, the ion exchange water W1 is supplied from the first discharge pipe 3 to the regenerative ion exchange column 11 in an upward flow, and discharged from the supply pipe 6, whereby the ion exchange resin layer 12 ) Is backwashed (backwashing process). By this backwashing process, the anion exchange resin is transferred to the upper side of the exchange column main body 111 due to a slight difference in specific gravity between the anion exchange resin and the cation exchange resin, Respectively.

Next, in a state where the first chemical liquid supply pipe 7, the second chemical liquid supply pipe 8 and the regenerated wastewater discharge pipe 9 are unified, the sodium hydroxide aqueous solution is discharged from the first chemical liquid supply pipe 7 to the downflow regenerative ion exchange And the hydrochloric acid is supplied from the second chemical liquid supply pipe 8 to the regenerative ion exchange column 11 in an upward flow (regeneration treatment step). As a result, the anion exchange resin distributed on the upper side of the exchange column main body 111 is regenerated and the cation exchange resin distributed on the lower side of the exchange column main body 111 is regenerated. At this time, in order to efficiently regenerate the anion exchange resin, the sodium hydroxide aqueous solution is preferably heated to about 30 to 50 캜 by the heater 71 formed in the first chemical liquid supply pipe 7. The aqueous sodium hydroxide solution and the hydrochloric acid wastewater after regeneration are discharged from the regeneration waste water discharge pipe 9.

Subsequently, after the supply pipe 6 and the first discharge pipe 3 are formed and the first chemical liquid supply pipe 7, the second chemical liquid supply pipe 8 and the regeneration waste water discharge pipe 9 are closed, the first discharge pipe 3 , The ion exchange water W1 is supplied from the supply pipe 6 to the regenerative ion exchange column 11 in a downward flow with the automatic valve 5 stopping the flow to the second discharge pipe 4, (Sodium hydroxide aqueous solution and hydrochloric acid) used for regeneration are extruded from the regenerative ion exchange column 11 (extrusion step) in a single feeding manner by discharging the chemical liquid from the first discharge pipe 3. At this time, the ion exchange water W1 discharged from the first discharge pipe 3 is not supplied to the subsequent-stage subsystem. The regeneration operation (backwash process, regeneration process and extrusion process) up to this point is carried out two or more times in the case where the resistivity of the ion-exchanged water W1 is low or the increase in the sodium concentration to be described later is large .

The ion exchange resin layer 12 constituting the ion exchange resin layer 12 is mixed and then the first discharge pipe 3 is allowed to pass through the second discharge pipe 4 by the automatic valve 5 The pretreated water W is supplied from the supply pipe 6 to the regenerative ion exchange column 11 in the downstream direction in the individual / closed state of the same pipe as the extrusion process, And discharged from the discharge pipe 3, thereby performing circulating washing of the ion exchange resin (circulating washing step). At this time, the ion exchange water W1 discharged from the first discharge pipe 3 is not supplied to the downstream subsystem. At the same time, the ion exchange water W1 produced in the circulating washing process is supplied to the water quality measuring device 2 via the second discharge pipe 4. The flow rate of the ion exchange water W1 discharged from the regenerative ion exchanger 1 to the water quality measuring device 2 is preferably 1 l / min or more and 1.5 l / min.

The second automatic valve 24 and the third automatic valve 25 are differentiated and the first automatic valve 23 is closed in the water quality measuring apparatus 2. In the state where the ion exchange treated water W1 reaches the second And is sent to the ion concentration meter 22 from the discharge pipe 4. The sodium ion (Na ⁺ ) concentration is measured by the sodium ion electrode of the ion densitometer 22 for the ion-exchanged water W1 passed through the column (ion concentration measuring step). When the circulating washing process is insufficient, the sodium ion (Na &lt; ^{+ &} gt ^; ) resulting from the sodium hydroxide aqueous solution used in the regeneration treatment is included in the ion exchange treated water W1. Therefore, the automatic switching control means determines that the regeneration is appropriate when the sodium ion (Na ⁺ ) concentration of the ion-exchanged water W1 becomes equal to or less than a preset threshold value, ends the regeneration process, . The ion-exchanged water W1 after the ion concentration measurement is discharged to the outside of the system through the second waste water discharge pipe 27. [

In the ion concentration measuring step, when the sodium ion (Na ⁺ ) concentration of the ion exchange treated water (W1) exceeds a preset threshold value, the circulating washing step may be continued.

The automatic switching control means is a means for controlling the automatic switching control means so that the measured value of the resistivity of the ion exchange treated water W1 by the resistivity meter 21 and the measured value of the resistivity of the ion exchange water W1 by the sodium ion electrode of the ion density meter 22 (Na ^&lt; ⁺ & gt ^; ) concentration measured by the measurement device.

In this manner, the automatic changeover control means alternately repeats the operation of the water intake mode and the regeneration mode, whereby the measured value by the water quality measuring device 2, particularly the sodium ion Na ⁺ of the ion exchange treated water W1, It is possible to determine the adequacy of the regeneration of the ion exchange resin layer 12 based on the concentration and supply the ion exchange water W1 after the regeneration is judged to be appropriate to the downstream subsystem, ) Can be stabilized by keeping the sodium ion (Na &lt; ⁺ & gt ^; ) concentration to a desired value low.

[Second Embodiment]

2 is a schematic diagram showing a water quality management system 10 'according to a second embodiment of the present invention. The water quality management system 10 'of FIG. 2 comprises three parallel-regenerated ion exchange apparatuses 1 (first example) and two water quality measurement apparatuses 2 formed in parallel, and 3 Each of the treated water discharged from each of the regenerative ion exchange apparatuses 1 can be supplied to each of the two water quality measuring apparatuses 2. In Fig. 2, the regenerative ion exchanger 1 (1A, 1B, 1C) of each series is not shown. In Fig. 2 and the following description, the same reference numerals are used for the components having the same configuration or functions as those of the first embodiment, and a detailed description thereof will be omitted.

In this embodiment, as the water quality measuring device 2, a first water quality measuring device 2A and a second water quality measuring device 2B are formed in parallel in two stages. As the regenerative ion exchange device 1, The first regenerative ion exchanger 1A, the second regenerative ion exchanger 1B and the third regenerative ion exchanger 1C are formed in three stages in parallel. The second discharge pipe 4 of the first regenerative ion exchanger 1A is branched into a first branch pipe 4a and a second branch pipe 4b. A first water quality measuring device 2A is connected to the first branch pipe 4a via an automatic valve and a second water quality measuring device 2B is connected to the second branch pipe 4b via an automatic valve.

The second discharge pipe 4 of the second regeneration type ion exchange device 1B is branched into a first branch pipe 4c and a second branch pipe 4d. The first branch tube 4c joins the first branch tube 4a via the automatic valve and the second branch tube 4d joins the second branch tube 4b via the automatic valve. The second discharge pipe 4 of the third regeneration type ion exchange device 1C is branched into a first branch pipe 4e and a second branch pipe 4f. The first branch tube 4e joins the first branch tube 4a on the downstream side of the confluence point of the first branch tube 4a and the first branch tube 4c via the automatic valve and the second branch tube 4f And joins the second branch pipe 4b on the downstream side of the confluence point of the second branch pipe 4b and the second branch pipe 4d through the automatic valve.

[Operation method of water quality management system]

Next, a method of operating the water quality management system 10 'of the second embodiment will be described. In the following description, the first series by the first regeneration type ion exchange apparatus 1A and the second series by the second regeneration type ion exchange apparatus 1B are the collection mode, the third regeneration type ion exchange apparatus And the third sequence by the first sequence (1C) is the reproduction mode.

(First series-sampling mode)

In the first series, after the ion exchange process, the ion-exchanged water W1 discharged from the first regenerative ion exchanger 1A is supplied to the downstream subsystem via the first discharge pipe 3, 2 is passed through the first water quality measuring device 2A through the discharge pipe 4 and the first branch pipe 4a. In the first water quality measuring apparatus 2A, the resistivity meter 21 measures the resistivity of the ion-exchanged water W1 (resistivity measuring step). The ion exchange water W1 after the resistivity measurement is discharged to the outside of the system via the first waste water discharge pipe 26. [ When the measured resistivity exceeds a predetermined threshold value, the automatic switching control means switches to the regeneration mode.

(Second series-reproduction mode)

In the second series, an aqueous solution of sodium hydroxide is supplied from the first chemical liquid supply pipe 7 to the regenerative ion exchange column 11 of the second regenerative ion exchanger 1B after the backwashing process, and the second chemical liquid And hydrochloric acid is supplied from the supply pipe 8 (regeneration treatment step). The regenerated wastewater discharge pipe 9 discharges the aqueous sodium hydroxide solution and the hydrochloric acid wastewater after regeneration in the second regenerative ion exchanger 1B.

(3rd series - playback mode)

In the third series, the ion-exchanged water W1 discharged from the third regenerative ion exchanger 1C after the circulation process is discharged via the first discharge pipe 3 and the second discharge pipe 4 Is passed through the second branch pipe (4f) to the second water quality measuring device (2B). Then, in the second water quality measuring apparatus 2B, the ion concentration of the ion-exchanged water W1 is measured by the ion concentration meter 22 (ion concentration measuring step). At this time, since the first water quality measuring device 2A is used for measuring the resistivity of the ion-exchanged water W1 of the first regenerative ion exchanger 1A, The ion exchange water W1 discharged from the ion exchange water W1 is automatically controlled to pass through the second branch pipe 4f without passing through the first branch pipe 4e by the automatic valve, 2B) can be selected, and the sodium ion (Na ⁺ ) concentration of the ion-exchanged water W1 can be measured.

In this way, even when three regenerative ion exchange apparatuses 1 are formed in parallel, one water quality management system 10 'can select a specific regenerative ion exchanger apparatus 1 It is possible to simplify the management of the water quality of the treated water as compared with the case where the water quality measuring apparatus 2 is formed for each of the regenerative ion exchange apparatuses 1 (1A, 1B, 1C) It is possible to stably supply the treated water with the suppressed ion concentration to the subsequent-stage subsystem.

[Other examples of the regenerative ion exchanger]

Next, each of the second to sixth example regenerative ion exchange apparatuses 1 shown in Figs. 3 to 7 will be described. In the following examples, when the regenerative ion exchanger 1 is provided with a plurality of regenerative ion exchanger columns 11, the regenerative ion exchanger column 11 at the rearmost end of the regenerative ion exchanger 1 (Resistivity, sodium ion (Na &lt; ⁺ & gt ^; ) concentration) of the ion-exchanged water W1 discharged from the ion-exchanged water W1 may be measured based on the first embodiment or the second embodiment. In short, the second discharge pipe 4 of the regeneration type ion exchange column 11 at the rearmost end of the regenerative ion exchanger 1 may be connected to the water quality measuring device 2. At this time, it is preferable that the water quality measuring device 2 is formed right next to the automatic valve 5. In FIGS. 3 to 7 and the following description, the same reference numerals are used for the components having the same configuration or the same function, and a detailed description thereof will be omitted.

(Regenerative ion exchange apparatus according to the second example)

The regenerative ion exchange apparatus 1 shown in Fig. 3 is an embodiment composed of a single regenerative ion exchange column 11. In the present embodiment, the regeneration type ion exchange column 11 is a system of passing in an upward flow, and in the exchange column body 111, an anion exchange resin layer 12A and a cation exchange resin layer (12B) are separated from each other. The lower portion of the exchange column main body 111 is connected to the supply pipe 6 for the pretreatment water W for performing the ion exchange treatment while the first discharge pipe 3 of the ion exchange treated water W1 is connected to the upper portion thereof And the second discharge pipe 4 is branched and connected to the first discharge pipe 3 through the automatic valve 5. A first chemical liquid supply pipe 7 is connected to the first discharge pipe 3 on the upstream side of the automatic valve 5 for supplying NaOH solution as alkali as a regenerating chemical liquid, And a first regeneration waste water discharge pipe 91 for discharging NaOH regeneration waste water is connected to the side portion. On the other hand, a second chemical liquid supply pipe 8 for supplying hydrochloric acid (HCl) as an acid as a regenerating chemical liquid is connected to the side of the exchange column main body 111, 2 regeneration waste water discharge pipe 92 is connected. The first regenerated waste water discharge pipe 91 and the second regenerated wastewater discharge pipe 9 are connected to the first discharge pipe 3, the second discharge pipe 4, the supply pipe 6, the first chemical liquid supply pipe 7, the second chemical liquid supply pipe 8, (Not shown) are formed in the valve body 92, respectively. 3, reference numeral 71 denotes a heater (plate-type heat exchanger) formed in the first chemical liquid supply pipe 7, and 13A denotes a plurality of holes which are smaller than the anion exchange resin constituting the anion exchange resin layer 12A It is a shielding plate.

(Regenerative ion exchange apparatus according to the third example)

The regenerative ion exchange apparatus 1 shown in Fig. 4 is a mode composed of a single regenerative ion exchange column 11. In the present embodiment, the regenerative ion exchange column 11 is of a type that flows in an upward flow, and includes a cation exchange resin layer 12B and an anion exchange resin layer (12A) are separated from each other. The lower portion of the exchange column main body 111 is connected to the supply pipe 6 for the pretreatment water W for performing the ion exchange treatment while the first discharge pipe 3 of the ion exchange treated water W1 is connected to the upper portion thereof And the second discharge pipe 4 is connected to the first discharge pipe 3 through the automatic valve 5. [ A second chemical liquid supply pipe 8 for supplying hydrochloric acid (HCl) as an acid as a recycled chemical liquid is connected to the first discharge pipe 3 at the upstream side of the automatic valve 5, Is connected to a second regeneration waste water discharge pipe 92 for discharging hydrochloric acid regeneration wastewater. A first chemical liquid supply pipe 7 is connected to the side of the exchange column main body 111 to supply an NaOH solution as alkali as a regenerating chemical liquid and a first regeneration And a waste water discharge pipe 91 is connected. The first regenerated waste water discharge pipe 91 and the second regenerated wastewater discharge pipe 9 are connected to the first discharge pipe 3, the second discharge pipe 4, the supply pipe 6, the first chemical liquid supply pipe 7, the second chemical liquid supply pipe 8, (Not shown) are formed in the valve body 92, respectively. 4, reference numeral 71 denotes a heater (plate type heat exchanger) formed in the first chemical liquid supply pipe 7, and reference numeral 13B denotes a plurality of holes which are smaller than the cation exchange resin constituting the cation exchange resin layer 12B It is a shielding plate.

(Regenerative ion exchange apparatus according to the fourth example)

The regenerative ion exchanger 1 shown in Fig. 5 is a so-called two-phase three-column ion exchanger and includes a two-layer type regenerated cation exchange resin column (H tower) 11B, a deaerator 20 , And a two-layer type regenerative anion exchange resin tower (OH tower) 11A. A supply pipe 6 for the pretreatment water W to be subjected to the ion exchange treatment is connected to the lower side of the H tower 11B while a first discharge pipe 3 is connected to the first discharge pipe 3 and the second discharge pipe 4 is connected to the first discharge pipe 3 via the automatic valve 5. [ A second chemical solution supply pipe 8 for supplying hydrochloric acid (HCl) as an acid as a regenerant chemical solution is connected to the upper side of the H tower 11B and a pre-treatment water W Is connected to the second regeneration waste water discharge pipe 92 for discharging the hydrochloric acid regeneration wastewater. A first chemical liquid supply pipe 7 for supplying an NaOH solution as alkali as a regenerated chemical liquid is provided in the first discharge pipe 3 on the upper side (discharge side) of the OH tower 11A on the upstream side of the automatic valve 5 And a first regenerated wastewater discharge pipe 91 for discharging NaOH regeneration wastewater is connected to the lower side (supply side) of the OH tower 11A. 5, reference numeral 71 denotes a heater (plate type heat exchanger) formed in the first chemical liquid supply pipe 7, 30 denotes a pump for supplying the treated water treated by the degassing apparatus 20 to the OH tower 11A, to be. The specifications of the degassing apparatus 20 and the pump 30 formed at the rear end of the degassing apparatus 20 are not particularly limited. The same applies to the fifth and sixth examples below.

In this two-phase three-column type ion exchange apparatus, the ion exchange resin layer 12 filled in the H tower 11B is formed of a mixture of the cation exchange resin layer 12b and the strong cation exchange resin layer 12b ' The ion exchange resin layer 12 having a two-layer structure and filled in the OH column 11A has a two-layer structure of a weakly anion exchange resin layer 12a and a strong ion exchange resin layer 12a '. Between the weak cation exchange resin layer 12b and the strong cation exchange resin layer 12b ', the weak anion exchange resin layer 12a and the strong ion exchange resin layer 12a' Shielding plates (not shown) having a plurality of holes smaller than the cation exchange resin are respectively formed.

(Regenerative ion exchange apparatus according to the fifth example)

The regenerative ion exchange apparatus 1 shown in Fig. 6 is a so-called three-phase four-column type ion exchange apparatus, and includes a first regenerated cation exchange resin column (H1 column) 11B of two layers and a degassing apparatus 20 ), A two-layer type regenerative anion exchange resin tower (OH tower) 11A and a single-layer type second regenerated cation exchange resin tower (H2 tower) 11B '. The lower portion of the H1 column 11B is connected to the supply pipe 6 of the pretreatment water W for performing the ion exchange treatment while the lower portion of the H2 column 11B ' And the second discharge pipe 4 is connected to the first discharge pipe 3 via the automatic valve 5. [ A second chemical liquid supply pipe 8 for supplying hydrochloric acid (HCl) as an acid as a regenerating chemical liquid is connected to the upper portion of the H2 tower 11B '. An automatic valve 5 is connected to the first discharge pipe 3, A second regeneration waste water discharge pipe 92 for discharging hydrochloric acid regeneration waste water is connected to the upstream side of the regeneration waste water discharge pipe 92. [ The second regeneration waste water discharge pipe 92 is connected to the upper side (discharge side) of the H1 column 11B and the supply pipe 6 on the lower side (supply side) of the H1 column 11B is connected to a waste organ 94 Are connected. A first chemical liquid supply pipe 7 for supplying NaOH solution as an alkali is connected to the upper side (discharge side) of the OH tower 11A. On the lower side (supply side) of the OH tower 11A, And a first regenerated waste water discharge pipe 91 for discharging the waste water. Reference numeral 71 denotes a heater (plate type heat exchanger) formed in the first chemical liquid supply pipe 7 and reference numeral 30 denotes a pump for supplying treated water treated by the degassing apparatus 20 to the OH tower 11A.

In this three-phase four-column ion exchange apparatus, the ion-exchange resin layer 12 filled in the H1 column 11B is composed of the cation exchange resin layer 12b and the strong cation exchange resin layer 12b ' The ion exchange resin layer 12 having a two-layer structure and filled in the OH column 11A has a two-layer structure of a weakly anion exchange resin layer 12a and a strong ion exchange resin layer 12a '. Between the weak cation exchange resin layer 12b and the strong cation exchange resin layer 12b ', the weak anion exchange resin layer 12a and the strong ion exchange resin layer 12a' Shielding plates (not shown) having a plurality of holes smaller than the cation exchange resin are respectively formed.

(Regenerative ion exchange apparatus according to the sixth example)

The regenerative ion exchanger 1 shown in Fig. 7 is a so-called four-phase five-column ion exchanger, and basically, the regenerative cation exchanger 1 of the three-phase four- And a second regenerative anion exchange resin column (OH2 column) 11A 'of a single layer type is additionally formed at the rear end of the resin column (H2 column) 11B'. The first outlet pipe 3 of the ion exchange water W1 is connected to the lower portion of the OH2 column 11A 'and the second outlet pipe 3 is connected to the second outlet pipe 4 via the automatic valve 5. [ Respectively. A first chemical liquid supply pipe 7 for supplying NaOH solution as an alkali is connected to the upper portion of the OH2 column 11A ' And a first regenerated waste water discharge pipe 91 for discharging NaOH regeneration waste water. The first regenerated waste water discharge pipe 91 is connected to the upper side (discharge side) of the first regenerative anion exchange resin tower (OH1 column) 11A as the NaOH solution supply pipe, A waste organs 93 of the NaOH regeneration wastewater are connected.

While the present invention has been described with reference to the accompanying drawings, it is to be understood that the present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the ratio of the number of the regenerative ion exchange apparatuses 1 formed in parallel and the number of the water quality measuring apparatuses 2 formed in parallel is determined by the number of the water quality measuring apparatuses 2, Is equal to or smaller than the number of the apparatuses 1, and is not limited to 3 to 2. A known water treatment element such as a reverse osmosis membrane separation device can be formed at the front end of the regenerative ion exchanger 1. In the above embodiment, the switching to the regeneration mode is performed when the resistivity of the ion exchange water W1 by the resistivity meter 21 exceeds a preset threshold value. However, in the ion exchange treatment of a predetermined volume The operation mode may be switched to the regeneration mode at the time of manufacturing the number W1, or the timing of switching from the regeneration mode to the regeneration mode may be measured.

Example

Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to the following examples.

[Example]

The regeneration type ion exchange apparatus 1 of the first example shown in Fig. 1 is formed in parallel in two stages, and the water quality management system 10 'shown in Fig. Respectively. Usually, the first series (the first regenerative ion exchanger 1A) is in the collection mode, and the second series (the second regenerative ion exchanger 1B) is the regenerative mode and the atmosphere.

All of the first water quality measuring device 1A and the second water quality measuring device 1B were manufactured by using MX-3 (manufactured by Kurita Kogyo Co., Ltd.) as a resistivity meter 21 and using an ion concentration meter 22 using a sodium ion electrode , and swan AMI Soditrace (manufactured by T &amp;

As the ion exchange resin to be filled in the ion exchange column 11, a porous type PK228L (manufactured by Mitsubishi Chemical Corporation) was used as the cation exchange resin and a porous type PA312L (manufactured by Mitsubishi Chemical Corporation) was used as the anion exchange resin.

(First series)

First, the anion exchange resin and cation exchange resin volume ratio of 1: Claim for which the ion exchange resin, which is filled with a mixture 2, chaesu a space velocity (SV) to 40 h ^-1 1 regenerative ion exchanger (1A ) Was passed through the first water quality measuring device 2A to measure the resistivity and sodium ion (Na ⁺ ) concentration in the ion-exchanged water W1.

Next, the operation mode of the first regenerative ion exchange apparatus 1A is switched from the water intake mode to the regeneration mode, and the regeneration operation of the ion exchange resin layer 12 charged in the regenerative ion exchange column 11 is carried out Respectively. The detailed process of the regeneration operation is as follows.

The ion exchange resin layer 12 charged in the regenerative ion exchange column 11 is used as the backwash water W1 by using the ion exchange water W1 in a state where the water supply to the first water quality measuring device 2A is stopped. , And a cation exchange resin and an anion exchange resin were separated (backwash process).

Next, in a state in which the water supply to the first water quality measuring device 2A is stopped, an aqueous hydrochloric acid (HCl) solution for industrial use in which the separated cation exchange resin is adjusted to 5% is regenerated as a regenerated chemical solution, An anion exchange resin was regenerated as a regenerated chemical liquid by an industrial aqueous sodium hydroxide (NaOH) solution adjusted to 4% with water heated to 40 DEG C by a heater 71 (regeneration treatment step).

Subsequently, in a state in which the water supply to the first water quality measuring device 2A is stopped, the ion exchange water W1 is supplied to each of the cation exchange resin and the anion exchange resin regenerated with the regeneration chemical liquid as a downstream flow And the regenerated chemical solution in the regenerative ion exchange column 11 and the ion exchange resin layer 12 was extruded (extrusion step).

Then, in a state in which the water supply to the first water quality measuring device 2A is stopped, the pretreated water W is supplied to the regeneration type ion exchange column 1A in a downward flow, whereby the cation exchange resin And anion exchange resin were mixed, and the mixed ion exchange resin was circulated and washed with pretreated water (circulating washing process).

Simultaneously, the circulating water of the first regenerative ion exchange apparatus 1A was passed through the first water quality measuring apparatus 2A, and the resistivity of the circulating water and the sodium ion (Na ⁺ ) concentration were measured. At the time when the resistivity was 18.0 M? 占 ㎝ m or more and the sodium ion (Na ⁺ ) concentration became 300 ng / ℓ or less, water supply to the first water quality measuring device 2A was stopped and the regeneration treatment was terminated.

The operation mode of the first regenerative ion exchange apparatus 1A is switched from the regeneration mode to the water supply mode and the ion exchange water W1 (W1) by the ion exchange resin layer 12 charged in the regenerative ion exchange column 11 ), And the ion exchange water W1 was passed through the first water quality measuring apparatus 2A to measure the resistivity and the sodium ion (Na ⁺ ) concentration.

(Second series)

The resistivity and the sodium ion (Na ⁺ ) concentration of the ion-exchanged water W1 before regeneration treatment were measured by the second water quality measuring apparatus 2B with respect to the second regenerative ion exchanger 1B in the water. The operation mode of the second regenerative ion exchanger 1B is switched from the water intake mode to the regeneration mode and the regeneration process of the ion exchange resin layer 12 charged in the regenerative ion exchange column 11 is switched to the regeneration mode Was carried out in the same manner as in the case of the ion exchange apparatus 1A.

(Volume: cation exchange resin / anion exchange resin = 1 / 1.6, SV, manufactured by Sumitomo Chemical Co., Ltd.) formed in the sub-system in the downstream stage in the water intake mode of each of the regenerative ion exchangers 1A, (Na ⁺ ) concentration of the treated water discharged from the water separator 80- ^{h was} analyzed using ICP-MS (Agilent Technologies, 7500 cs).

[Comparative Example]

As in the above embodiment, the regenerative ion exchanger 1 of the first example shown in Fig. 1 is formed in two stages in parallel, and the water quality management system 10 'shown in Fig. The switching operation was carried out four times in this order. Usually, the first series (the first regenerative ion exchanger 1A) is in the collection mode, and the second series (the second regenerative ion exchanger 1B) is the regenerative mode and the atmosphere.

For the cation exchange resin separated by the backwashing process, an aqueous solution of by-product hydrochloric acid (HCl) adjusted to 5% was regenerated as a regenerating agent.

(Volume: cation exchange resin / anion exchange resin = 1 / 1.6, SV, manufactured by Sumitomo Chemical Co., Ltd.) formed in the sub-system in the downstream stage in the water intake mode of each of the regenerative ion exchangers 1A, (Na ⁺ ) concentration of the treated water discharged from the water separator 80- ^{h was} analyzed using ICP-MS (Agilent Technologies, 7500 cs).

It is also preferable that the resistivity of the ion-exchanged water W1 of each of the regenerative ion exchangers 1A and 1B in the collected water is 18.0 M? · Cm or less and the sodium ion (Na ⁺ ) concentration exceeds 500 ng / Regeneration was repeated twice.

The resistivity of the ion-exchanged water W1 and the sodium ion (Na ⁺ ) concentration (indicated by A in the table, the same applies hereinafter) of the ion-exchanged water W1 after 12 hours from the start of water collection in the first regenerative ion exchange apparatus 1A, 2 Comparison of the resistivity of the ion-exchanged water W1 12 hours after the start of water collection and the sodium ion (Na ⁺ ) concentration (indicated by B in the table below) in the regenerative ion exchanger 1B 1. The sodium ion (Na ⁺ ) concentration in the ion-exchanged water W1 at the time of regeneration and water collection is controlled by the water quality management system 10 ' (Na ⁺ ) concentration can be controlled to 300 ng / liter or less.

The sodium ion of the treated water discharged from the non-raw material ion exchange device formed in the downstream subsystem (Na (Na) in the first regenerative ion exchanger 1A and the second regenerative ion exchanger 1B ⁺ ) Concentrations are shown in Table 2. The sodium ion (Na ⁺ ) concentration in the ion-exchanged water W1 during the regeneration and regeneration of each of the regenerative ion exchangers 1A and 1B is controlled by the water quality management system 10 ' It can be seen that the short-term fluctuation of the sodium ion (Na ⁺ ) concentration in the treated water discharged from the reproductive ion exchange apparatus can be controlled.

As described above, not only the resistivity but also the sodium ion (Na &lt; ⁺ & gt ^; ) concentration are measured with respect to the quality of the ion-exchanged water W1 during regeneration and regeneration of the regenerative ion exchanger 1, By appropriately managing the regeneration of the ion exchange resin layer 12, it is possible to appropriately perform the switching of the regeneration mode / the water sampling mode, and the sodium ion concentration in the treated water discharged from the non-living ion exchange apparatus of the downstream subsystem It can be seen that the short-term variation of the ion (Na ⁺ ) concentration can be controlled.

10 Water quality management system
1 regenerative ion exchanger
11 Regenerative ion exchange column
111 exchange tower body
12 Ion exchange resin layer
2 Water quality measuring device
21 Resistivity meter
22 Ion density meter
26 1st wastewater discharge pipe
27 2nd wastewater discharge pipe
3 First discharge pipe
4 second discharge pipe
5 Automatic valves
6 feeder
7 First liquid supply pipe
8 Second drug solution supply tube
9 Wastewater discharge pipe
W preprocessing water
W1 ion exchange water treatment

Claims (5)

A regenerative ion exchange apparatus,
A water quality measuring device having an ion density meter,
A first discharge pipe through which the treated water discharged from the regenerative ion exchange apparatus flows,
And a second discharge pipe branched from the first discharge pipe and supplying the treated water to the water quality measuring apparatus. The method according to claim 1,
In the case where the regenerative ion exchange apparatus has a plurality of regenerable ion exchange columns,
And the effluent flowing out from the regeneration type ion exchange column at the last stage of the regenerative ion exchanger is used as the treated water. 3. The method according to claim 1 or 2,
And an automatic switching control means for automatically switching an operation mode including a regeneration mode for regenerating the regenerative ion exchange apparatus and a watering mode for collecting the treated water,
Wherein the automatic switching control means performs automatic switching control of the operation mode in accordance with the measured value of the water quality measuring device. 4. The method according to any one of claims 1 to 3,
The regenerative ion exchanger formed in parallel with N (N is an integer of 2 or more)
N water quality measurement devices formed in parallel or less,
And each of the treated water discharged from each of the N regenerative ion exchange apparatuses is configured to be supplied to each of the N or less water quality measuring apparatuses. A method of operating a water quality management system according to any one of claims 1 to 4,
A step of measuring an ion concentration of the treated water by the ion densitometer;
A method for operating a water quality management system comprising a step of automatically switching and controlling a watering mode for taking out the treated water and a regeneration mode for regenerating the regenerative ion exchange apparatus based on the measured value of the measured ion concentration .

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