JP3956781B2 - Replacement method of ion exchange resin in mixed bed type ion exchange tower - Google Patents
Replacement method of ion exchange resin in mixed bed type ion exchange tower Download PDFInfo
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Description
【０００１】
本発明は、混床型イオン交換塔におけるイオン交換樹脂の取替え方法に係り、特に、イオン交換樹脂からの溶出物による脱イオン性能の低下を抑制したイオン交換樹脂の取替え方法に関するものである。
【０００２】
【従来の技術】
半導体製造用、発電所用及び医薬、食品用に用いられる純水、超純水は、井水、工業用水、上水など、あるいはこれらを前処理した前処理水を原水として混床型イオン交換塔に通水して製造している。
混床型イオン交換塔にはカチオン交換樹脂とアニオン交換樹脂とが混合状態で充填され、原水を通水すると、水中のアニオン、カチオンはこれらのイオン交換樹脂に吸着され、純水が得られる。そして、通水を継続し（採水工程）、製造された純水の水質が目標水質に達しないことが予測される時期にイオン交換樹脂の再生工程に入る。再生工程では混合状態のイオン交換樹脂を逆洗分離してカチオン交換樹脂、アニオン交換樹脂とに分離し、それぞれの樹脂を再生薬剤と接触させて再生し、再度混合して再生工程を終え、採水工程に戻る。
【０００３】
【発明が解決しようとする課題】
このような従来の混床型イオン交換塔による純水製造では、目標水質の純水が得られないことがあった。それはイオン交換樹脂から再生時に多少なりとも有機物が溶出し、イオン交換樹脂の脱塩性能を劣化させることに起因したものであり、特に、高純度の純水を製造する場合に不都合な現象である。このため、従来、イオン交換樹脂からの有機物溶出問題に対して、充填するイオン交換樹脂にあらかじめ加温液を通液して溶出し易い有機物を溶出させるか、あるいは酸またはアルカリ処理し、洗浄するなどして対処していた。
しかし、このような対処によっても純水や超純水として十分に満足しえる水質が得られない場合があった。通常、混床型イオン交換塔を長期間運転すると、徐々にイオン交換性能が劣化し、再生を行っても初期の性能まで回復しなくなるので、そのような場合にはカチオン交換樹脂およびアニオン交換樹脂の両方を同時に新品樹脂に取替えることが行われている。このような両方の新品樹脂の取替えが行われると、たとえば、取替え前は混床型イオン交換塔に通水して比抵抗値１５ＭΩ・ｃｍの目標水質の純水を製造していたのが、両方の新品樹脂に取替え後は、再生毎に純水の水質が低下し、１３ＭΩ・ｃｍまで低下する場合がある。
【０００４】
【課題を解決するための手段】
本発明は、イオン交換樹脂からの溶出物による脱塩性能の低下を、従来とは異なる観点から解決するものであり、純水水質を目標値に維持することができる混床型イオン交換塔のイオン交換樹脂の取替え方法を提供することを目的に開発されたもので、カチオン交換樹脂とアニオン交換樹脂とを共に交換する際に、充填されていたアニオン交換樹脂を新品アニオン交換樹脂と取替えた後、混床型イオン交換塔のイオン交換樹脂の再生を１〜１０日に１回の頻度で４回行った後に、充填されていたカチオン交換樹脂を新品カチオン交換樹脂と取替えるようにして、前記両交換樹脂の取替え時期を異ならせるようにしたことを特徴とする。そして、この場合、新品のイオン交換樹脂への取替え時期が１〜５年毎であることが好ましい。
【０００５】
【作用】
イオン交換樹脂を再生すると、カチオン交換樹脂からは主にポリスチレンスルホン酸が溶出し、アニオン交換樹脂からは主にトリメチルアンモニウム基またはジメチルエタノールアンモニウム基が溶出し、イオン交換樹脂が新品か、新品に近い間は溶出量が比較的多く、その後は溶出量が減少する。そして、カチオン交換樹脂からの上記溶出物はアニオン交換樹脂に吸着され、アニオン交換樹脂からの上記溶出物はカチオン交換樹脂に吸着される。混床型イオン交換塔では両樹脂は混合状態におかれるため、洗浄が十分行われるとしても、溶出物による相互汚染は避けられない。
しかも、新品あるいは新品に近い間はイオン交換樹脂の活性が高いため、樹脂の有機物吸着量は大きい。
また、カチオン交換樹脂からの溶出物はアニオン交換樹脂に吸着されるが、アニオン交換樹脂に吸着された溶出物は再生毎に徐々に剥離され、蓄積され難い。一方、アニオン交換樹脂からの溶出物はカチオン交換樹脂に吸着され、カチオン交換樹脂を再生してもほとんど剥離せず、蓄積されていき、カチオン交換樹脂の脱イオン交換樹脂の脱イオン性能は回復されがたい。
【０００６】
本発明は、上述した知見を生かした混床型イオン交換塔のイオン交換樹脂の取替え方法であり、混床型イオン交換塔のアニオン交換樹脂を新品アニオン交換樹脂に取替えた後、所定期間経過後、カチオン交換樹脂を新品カチオン交換樹脂に取替える。
すなわち、混床型イオン交換塔のイオン交換樹脂を新品アニオン交換樹脂に取替えた後、イオン交換塔内において新品アニオン交換樹脂は塔内に残留している使用中のカチオン交換樹脂と混合して混床を形成し、原水を通水して純水を製造する。適当な時間毎に各樹脂を再生しながら運転を継続する。この間、再生毎に両樹脂から有機物が溶出し、アニオン交換樹脂からの溶出物はカチオン交換樹脂、カチオン交換樹脂からの溶出物はアニオン交換樹脂に吸着することになるが、使用中のカチオン交換樹脂の有機物吸着量は既に吸着活性が低下しており、新品アニオン交換樹脂からの溶出量が多いにもかかわらず、カチオン交換樹脂へ吸着しても微量であり、溶出物吸着によるカチオン交換樹脂の性能低下はわずかである。又、新品アニオン交換樹脂はカチオン交換樹脂の溶出物を吸着し易いが、カチオン交換樹脂からの溶出物は長期使用されたカチオン交換樹脂の溶出物量が少ないことと、アニオン交換樹脂に吸着した溶出物は再生毎に徐々に剥離して蓄積しないことからアニオン交換樹脂の脱イオン性能への影響はわずかである。
新品のカチオン交換樹脂の取替えは、新品アニオン交換樹脂の取替えとは同時に行わず、所定期間経過後に行う。新品カチオン交換樹脂の取替えによって、再生毎にカチオン交換樹脂から溶出物は比較的多く溶出し、アニオン交換樹脂に一旦吸着するけれども、新品時ほどの吸着力はなく、また、アニオン交換樹脂に吸着した溶出物は再生毎に剥離するので蓄積することはない。
【０００７】
【発明の実施の形態】
本発明における混床型イオン交換塔は、通常用いられている再生式混床型イオン交換塔と同様、塔内にカチオン交換樹脂とアニオン交換樹脂を充填しておき、純水を製造する採水工程では、両イオン交換樹脂を混合状態にしてイオン交換樹脂床（混床）を形成しておく。イオン交換塔内に導入された原水は、上向流または下向流で通水され、混床を通過する際にイオン交換反応によりカチオン、アニオンが吸着除去されて純水となる。所定水量の純水を採水した後、または所定時間経過した後、または純水水質が低下した際、再生工程に移る。再生は目標の純水水質、樹脂量、採水量によって変化するが、通常１〜１０日に１回の頻度で行われる。
再生工程では、任意の再生方法を採用できるが、通常、まず上向流にて通水（逆洗）し、採水工程中に樹脂床上及び内部に沈積した懸濁物を除去するとともに両イオン交換樹脂を比重差により分離させ、通水を止めて樹脂層を沈静させて、カチオン交換樹脂層を下部に、アニオン交換樹脂層を上部に形成させる。次いで、カチオン交換樹脂層に塩酸などのカチオン樹脂再生剤を、アニオン交換樹脂層に水酸化ナトリウムなどのアニオン交換樹脂再生剤をそれぞれ供給して両イオン交換樹脂の性能を回復させる。その後各樹脂層に残留する再生剤を少量の純水で押出し、さらに多量の純水を供給して樹脂を洗浄する。洗浄後、両イオン交換樹脂を混合して再生工程を終了する。
【０００８】
このような採水工程と再生工程を繰り返して長期間運転していると、イオン交換樹脂の性能は劣化し、また、一部粉砕されて使用中のイオン交換樹脂を新品のイオン交換樹脂と取替える必要が生じる。
新品樹脂への取替え時期は、再生後のイオン交換樹脂の性能回復度合いから決めてもよいが、通常定期的に取替えることが多い。たとえば、イオン交換樹脂の使用条件によるが、通常１〜５年毎に取替える。
取替え方法の一例としては、混床型イオン交換塔が上述したように再生工程に移行し、逆洗分離、再生剤供給、押出し、洗浄を経た状態で、再生済みのアニオン交換樹脂層のみを塔外に排出し、用意された再生済みの新品アニオン交換樹脂を塔内へ投入し、塔内のカチオン交換樹脂と混合して採水工程に入ってもよい。あるいは、上述の新品アニオン交換樹脂を投入後、再び再生工程を行ってからカチオン交換樹脂と混合してもよい。また、使用されていた両樹脂を逆洗分離した後、直ちにアニオン交換樹脂のみを排出し、代わりに新品アニオン交換樹脂を投入後、再生工程に移ってもよい。
アニオン交換樹脂を新品アニオン交換樹脂と取替えた後は、採水工程を繰り返す通常運転に戻る。そして、新品アニオン交換樹脂に取替え後、所定期間経過したときカチオン交換樹脂を新品のカチオン交換樹脂に取替える。カチオン交換樹脂の取替え時期は新品アニオン交換樹脂からの溶出量が低下したときである。経験的にアニオン交換樹脂を取替えた後、通常運転してイオン交換塔のイオン交換樹脂の再生が４回以上行われる期間を経ることにより、アニオン交換樹脂からの溶出量が著しく減少する。したがって、アニオン交換樹脂の取替え後、再生工程を４回以上行ったときにカチオン交換樹脂の取替えを行うのが好ましい。再生工程が７日に一度行われるイオン交換塔ではアニオン交換樹脂の取替えが行われてから約１ヶ月経過後にカチオン交換樹脂を取替えるのがよい。
カチオン交換樹脂の取替えは、アニオン交換樹脂の取替えと同様な方法で行うことができる。
【０００９】
取替える新品アニオン交換樹脂も、新品カチオン交換樹脂も可能な限り溶出量低減処理した上で、取替えるのが好ましい。溶出量低減処理は既知の方法を採用でき、たとえばイオン交換樹脂に４０℃前後に加温したアルカリ水溶液を通液し、水洗することによって溶出量を低減できる。低減処理した新品イオン交換樹脂を使用することにより、樹脂取替え後の溶出量が少なくなり、本発明の効果が一層向上するので好ましい。
【００１０】
［比較例］
カチオン交換樹脂としてダイヤイオン（三菱化学株式会社登録商標）ＰＫ２２８を０．５ｍ3、アニオン交換樹脂としてダイヤイオン（三菱化学株式会社登録商標）ＰＡ３１２を１ｍ3充填した混床型イオン交換塔に、工業用水を原水として４３２ｍ3／日の流量で通水し、純水を製造した。目標純水水質は比抵抗１７．５ＭΩ・ｃｍ以上であり、採水工程、再生工程を繰り返しながら３年間運転した。この間、カチオン交換樹脂再生剤として５％塩酸水溶液を、アニオン交換樹脂再生剤として４％水酸化ナトリウム水溶液を用いて、７日毎にイオン交換樹脂を再生した。得られた純水は比抵抗１７．５ＭΩ・ｃｍ以上であり、目標水質が維持された。そして、３年経過し、両樹脂の性能劣化が予測されたので、混床型イオン交換塔の両イオン交換樹脂を新品のカチオン交換樹脂と新品のアニオン交換樹脂に同時に取替え、通常運転を行った。その後再生工程を重ねる毎に得られる純水の水質が低下し、新品イオン交換樹脂に取替え後、再生工程を３回行った後に製造された純水の水質は、比抵抗１３ＭΩ・ｃｍとなり、再生剤量を増やしても水質の回復が図れなかった。
【００１１】
［実施例］
比較例と同様な構成、運転条件の混床型イオン交換塔を３年間運転した後、アニオン交換樹脂のみを新品アニオン交換樹脂に取替え、通常運転を継続した。１ヶ月経過後（４回再生後）、カチオン交換樹脂を新品樹脂に取替え、再び通常運転を継続した。３年間の運転中、その後の新品アニオン交換樹脂に取替えた運転中も、さらにカチオン交換樹脂を取替えた運転中も、製造された純水の水質はいずれも比抵抗１７．５ＭΩ・ｃｍ以上であり、目標水質が達成された。特に、比較例のように、アニオン交換樹脂の取替え後、再生毎に水質が低下していく現象は見られなかった。
【００１２】
【発明の効果】
このように、本発明では混床型イオン交換塔のアニオン交換樹脂の取替え時期とカチオン交換樹脂の取替え時期とを異なるようにするので、カチオン交換樹脂へのアニオン交換樹脂からの溶出物の蓄積を低減することができ、溶出物蓄積によるカチオン交換樹脂の脱イオン性能低下を抑制することができる。その結果、再生毎の純水の水質の低下を防止でき、混床型イオン交換塔の脱塩性能と長期維持して目標水質の純水が得られる。[0001]
The present invention relates to a replacement method of ion exchange resin in the mixed bed ion-exchange column, in particular, to a method replacement of ion exchange resin capable of suppressing deterioration of deionized performance due eluate from the ion exchange resin.
[0002]
[Prior art]
Pure water and ultrapure water used for manufacturing semiconductors, power plants, pharmaceuticals, and foods are well water, industrial water, clean water, etc., or mixed bed ion exchange towers using pretreated water that has been pretreated as raw water It is manufactured by passing water through.
The mixed bed type ion exchange tower is filled with a cation exchange resin and an anion exchange resin in a mixed state, and when raw water is passed through, the anions and cations in the water are adsorbed by these ion exchange resins to obtain pure water. Then, the water flow is continued (water sampling step), and the regeneration process of the ion exchange resin is started at the time when the quality of the produced pure water is predicted not to reach the target water quality. In the regeneration process, the mixed ion exchange resin is backwashed and separated into a cation exchange resin and an anion exchange resin, each resin is brought into contact with a regenerant agent, regenerated, mixed again, and the regeneration process is completed. Return to the water process.
[0003]
[Problems to be solved by the invention]
In such pure water production using a mixed bed type ion exchange tower, pure water having a target water quality may not be obtained. This is due to the fact that some organic substances are eluted from the ion exchange resin during regeneration and deteriorate the desalting performance of the ion exchange resin, which is an inconvenient phenomenon especially when high-purity pure water is produced. . For this reason, conventionally, in order to solve the organic matter elution problem from the ion exchange resin, a warming solution is passed through the ion exchange resin to be filled in advance to elute the organic matter that is easy to elute, or it is treated with acid or alkali and washed. I was dealing with it.
However, even with such measures, water quality that is sufficiently satisfactory as pure water or ultrapure water may not be obtained. Normally, when a mixed bed type ion exchange tower is operated for a long period of time, the ion exchange performance gradually deteriorates, and even if regeneration is performed, the initial performance is not recovered. In such a case, the cation exchange resin and the anion exchange resin Both are replaced with new resin at the same time. When both of these new resins are replaced, for example, before the replacement, water was passed through a mixed bed type ion exchange tower to produce pure water with a target water quality of a specific resistance value of 15 MΩ · cm. After replacement with both new resins, the water quality of pure water decreases every time it is regenerated, and may decrease to 13 MΩ · cm.
[0004]
[Means for Solving the Problems]
The present invention solves a decrease in desalting performance due to an eluate from an ion exchange resin from a viewpoint different from the conventional one, and is a mixed bed ion exchange column capable of maintaining a pure water quality at a target value. It was developed for the purpose of providing a method for replacing an ion exchange resin. After exchanging the filled anion exchange resin with a new anion exchange resin when exchanging the cation exchange resin and the anion exchange resin together, , after 4 times with a frequency of once a regeneration of the ion exchange resin mixed bed ion exchange column in 10 days, the cation exchange resin which has been filled so as to replace it with a new cation exchange resin, wherein both It is characterized in that the replacement time of the exchange resin is made different . In this case, it is preferable that the replacement time with a new ion exchange resin is every 1 to 5 years .
[0005]
[Action]
When the ion exchange resin is regenerated, polystyrene sulfonic acid mainly elutes from the cation exchange resin, and trimethylammonium group or dimethylethanolammonium group mainly elutes from the anion exchange resin, and the ion exchange resin is new or close to new. The amount of elution is relatively large during the period, and then the amount of elution decreases. The eluate from the cation exchange resin is adsorbed on the anion exchange resin, and the eluate from the anion exchange resin is adsorbed on the cation exchange resin. In a mixed bed type ion exchange tower, both resins are in a mixed state, so even if the washing is sufficiently performed, mutual contamination by the effluent is inevitable.
Moreover, since the activity of the ion exchange resin is high while it is new or near new, the amount of organic matter adsorbed by the resin is large.
In addition, the eluate from the cation exchange resin is adsorbed on the anion exchange resin, but the eluate adsorbed on the anion exchange resin is gradually peeled off at each regeneration and is not easily accumulated. On the other hand, the eluate from the anion exchange resin is adsorbed on the cation exchange resin, and even if the cation exchange resin is regenerated, it hardly separates and accumulates, and the deionization performance of the deion exchange resin of the cation exchange resin is restored. It's hard.
[0006]
The present invention is a method for replacing an ion exchange resin of a mixed bed type ion exchange column utilizing the above-described knowledge, and after replacing the anion exchange resin of the mixed bed type ion exchange column with a new anion exchange resin, after a predetermined period has elapsed. Replace the cation exchange resin with a new cation exchange resin.
That is, after replacing the ion exchange resin of the mixed bed type ion exchange column with a new anion exchange resin, the new anion exchange resin is mixed and mixed with the cation exchange resin in use remaining in the ion exchange column. A floor is formed, and pure water is produced by passing raw water. The operation is continued while each resin is regenerated at an appropriate time. During this time, the organic substances are eluted from both resins during each regeneration, and the eluate from the anion exchange resin is adsorbed to the cation exchange resin, and the eluate from the cation exchange resin is adsorbed to the anion exchange resin. The adsorption activity of the organic substance has already decreased, and even though the elution amount from the new anion exchange resin is large, the adsorption amount to the cation exchange resin is very small. The decline is slight. In addition, the new anion exchange resin is easy to adsorb the eluate of the cation exchange resin, but the eluate from the cation exchange resin has a small amount of the eluate of the cation exchange resin that has been used for a long time and the eluate adsorbed to the anion exchange resin. Is gradually exfoliated at each regeneration and does not accumulate, so the effect on the deionization performance of the anion exchange resin is minimal.
The replacement of the new cation exchange resin is not performed at the same time as the replacement of the new anion exchange resin, but is performed after a predetermined period. By replacing a new cation exchange resin, a relatively large amount of eluate is eluted from the cation exchange resin each time it is regenerated, and once adsorbed to the anion exchange resin. The eluate does not accumulate because it separates at each regeneration.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The mixed bed type ion exchange tower in the present invention is a water sampling system for producing pure water by filling a cation exchange resin and an anion exchange resin in the tower in the same manner as a commonly used regenerative mixed bed type ion exchange tower. In the step, both ion exchange resins are mixed to form an ion exchange resin bed (mixed bed). The raw water introduced into the ion exchange tower is passed in an upward flow or a downward flow, and when passing through the mixed bed, cations and anions are adsorbed and removed by ion exchange reaction to become pure water. After collecting a predetermined amount of pure water, or after a predetermined time has elapsed, or when the quality of the pure water has deteriorated, the process proceeds to a regeneration step. The regeneration varies depending on the target pure water quality, the amount of resin, and the amount of water collected, but is usually performed once every 1 to 10 days.
Although any regeneration method can be adopted in the regeneration process, usually, water is first passed in an upward flow (backwashing) to remove suspended substances deposited on and inside the resin bed during the water sampling process and both ions. The exchange resin is separated by the specific gravity difference, the water flow is stopped and the resin layer is allowed to settle, and the cation exchange resin layer is formed at the lower part and the anion exchange resin layer is formed at the upper part. Next, a cation resin regenerating agent such as hydrochloric acid is supplied to the cation exchange resin layer, and an anion exchange resin regenerating agent such as sodium hydroxide is supplied to the anion exchange resin layer to restore the performance of both ion exchange resins. Thereafter, the regenerant remaining in each resin layer is extruded with a small amount of pure water, and a large amount of pure water is supplied to wash the resin. After washing, both the ion exchange resins are mixed to complete the regeneration process.
[0008]
If the water sampling process and the regeneration process are repeated for a long period of time, the performance of the ion exchange resin deteriorates, and the ion exchange resin that is partially crushed and used is replaced with a new ion exchange resin. Need arises.
The time for replacement with a new resin may be determined based on the degree of recovery of the performance of the ion exchange resin after regeneration, but is usually replaced regularly. For example, depending on the use conditions of the ion exchange resin, it is usually replaced every 1 to 5 years.
As an example of the replacement method, the mixed bed type ion exchange tower moves to the regeneration step as described above, and only the regenerated anion exchange resin layer is subjected to the backwash separation, the regeneration agent supply, the extrusion, and the washing. It may be discharged to the outside, and the prepared new anion exchange resin that has been regenerated may be put into the tower and mixed with the cation exchange resin in the tower to enter the water sampling step. Alternatively, after the above-described new anion exchange resin is added, the regeneration step may be performed again and then mixed with the cation exchange resin. Alternatively, after the two resins that have been used are backwashed and separated, only the anion exchange resin may be immediately discharged, and a new anion exchange resin may be used instead, followed by a regeneration step.
After the anion exchange resin is replaced with a new anion exchange resin, the normal operation is repeated to repeat the water sampling process. Then, after the replacement with the new anion exchange resin, the cation exchange resin is replaced with a new cation exchange resin when a predetermined period has elapsed. The replacement time of the cation exchange resin is when the amount of elution from the new anion exchange resin is reduced. The amount of elution from the anion exchange resin is remarkably reduced by empirically replacing the anion exchange resin and passing through a period in which the ion exchange resin in the ion exchange column is regenerated four or more times after normal operation. Therefore, it is preferable to replace the cation exchange resin when the regeneration step is performed four or more times after the replacement of the anion exchange resin. In an ion exchange column in which the regeneration process is performed once every seven days, it is preferable to replace the cation exchange resin after about one month from the replacement of the anion exchange resin.
The replacement of the cation exchange resin can be performed in the same manner as the replacement of the anion exchange resin.
[0009]
It is preferable to replace the new anion exchange resin to be replaced and the new cation exchange resin after reducing the elution amount as much as possible. A known method can be employed for the elution amount reduction treatment. For example, the elution amount can be reduced by passing an alkaline aqueous solution heated to around 40 ° C. through an ion exchange resin and washing with water. Use of a new ion-exchange resin subjected to reduction treatment is preferable because the amount of elution after resin replacement is reduced and the effects of the present invention are further improved.
[0010]
[Comparative example]
A mixed bed type ion exchange tower packed with Diam (Mitsubishi Chemical Corporation registered trademark) PK228 0.5m 3 as cation exchange resin and 1m 3 Diaion (Mitsubishi Chemical Corporation registered trademark) PA312 as anion exchange resin Pure water was produced by passing irrigation water as raw water at a flow rate of 432 m 3 / day. The target pure water quality is 17.5 MΩ · cm or more in specific resistance, and the system was operated for 3 years while repeating the water sampling process and the regeneration process. During this period, the ion exchange resin was regenerated every 7 days using a 5% hydrochloric acid aqueous solution as the cation exchange resin regenerant and a 4% sodium hydroxide aqueous solution as the anion exchange resin regenerant. The obtained pure water had a specific resistance of 17.5 MΩ · cm or more, and the target water quality was maintained. After three years, the performance deterioration of both resins was predicted, so both ion exchange resins of the mixed bed type ion exchange tower were replaced with a new cation exchange resin and a new anion exchange resin at the same time, and normal operation was performed. . After that, the quality of pure water obtained each time the regeneration process is repeated decreases. The quality of the pure water produced after performing the regeneration process three times after replacing with a new ion exchange resin has a specific resistance of 13 MΩ · cm. The water quality could not be recovered even when the dosage was increased.
[0011]
[Example]
After operating the mixed bed type ion exchange tower having the same configuration and operating conditions as in the comparative example for 3 years, only the anion exchange resin was replaced with a new anion exchange resin, and the normal operation was continued. After one month (after four regenerations), the cation exchange resin was replaced with a new resin, and normal operation was continued again. During the operation for 3 years, the operation of replacing with a new anion exchange resin, and the operation of replacing the cation exchange resin, the quality of the pure water produced is 17.5 MΩ · cm or more in specific resistance. The target water quality has been achieved. In particular, as in the comparative example, after the replacement of the anion exchange resin, there was no phenomenon in which the water quality deteriorated at every regeneration.
[0012]
【The invention's effect】
As described above, in the present invention, the replacement time of the anion exchange resin and the replacement time of the cation exchange resin in the mixed bed type ion exchange column are made different from each other. It can reduce, and the deionization performance fall of the cation exchange resin by eluate accumulation can be suppressed. As a result, it is possible to prevent deterioration of the quality of pure water for each regeneration, and to obtain pure water with the target water quality while maintaining the desalting performance of the mixed bed ion exchange tower for a long period of time.
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