JP2013000725A - Method of operating water purification system, and the water purification system - Google Patents

Method of operating water purification system, and the water purification system Download PDF

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JP2013000725A
JP2013000725A JP2011137552A JP2011137552A JP2013000725A JP 2013000725 A JP2013000725 A JP 2013000725A JP 2011137552 A JP2011137552 A JP 2011137552A JP 2011137552 A JP2011137552 A JP 2011137552A JP 2013000725 A JP2013000725 A JP 2013000725A
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water
electrodeionization
pure water
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pure
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JP5785000B2 (en
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Toshikazu Abe
俊和 阿部
Michihiro Takada
倫宏 高田
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Nomura Micro Science Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a water purification system controlling intermittent operation of the water purification system according to usage of pure water at a use point without inducing a reduction in quality of the produced pure water regardless of intermittent operation of an electric deionizer.SOLUTION: In the water purification system including the electric deionizer and stopping operation when the water level of a pure water tank for holding the produced pure water rises and resuming the operation when the water level drops, in resuming the operation from an operation stopped state, water treated by a device disposed at the front stage of the electric deionizer is discharged (blows) for a predetermined period of time, and thereafter the water treated by the front stage device is supplied to the electric deionizer as water to be treated. Water quality deterioration of the treated water in the electric deionizer when resuming the operation can be prevented by discharging the treated water of high TOC (Total Organic Carbon) concentration from the front stage device directly after the operation is resumed.

Description

本発明は、純水装置の運転方法及び純水装置に係り、特に、水質の低下を招くことなく純水の断続供給を行うことを可能にした、電気脱イオン装置などを用いた純水装置の運転方法及び純水装置に関する。   The present invention relates to a method for operating a deionized water device and a deionized water device, and in particular, a deionized water device using an electrodeionization device or the like that enables intermittent water supply without deteriorating water quality. It is related with the operation method and pure water apparatus.

従来から、原水を、前処理装置、逆浸透膜装置及び電気脱イオン装置を順に配設した純水装置で処理して純水を製造し、ユースポイントに供給することが行われている。   Conventionally, raw water is treated with a pure water device in which a pretreatment device, a reverse osmosis membrane device, and an electrodeionization device are arranged in order to produce pure water and supply it to a use point.

一般にユースポイントにおける純水の使用は断続的であり、しかも純水の使用量はその都度変わるため、電気脱イオン装置で処理された純水を一旦純水タンクに貯留しておき、ユースポイントで使用されて純水タンクの貯水量が、一定量を下回ったときに、電気脱イオン装置を運転して純水タンクに純水を補給するようにしている。しかし、このような電気脱イオン装置の断続運転には、樹脂の再生不足や水質低下をもたらすという問題がある。   In general, the use of pure water at the point of use is intermittent, and the amount of pure water used changes each time, so the pure water treated by the electrodeionization device is temporarily stored in the pure water tank and When the amount of water stored in the pure water tank is below a certain level, the electrodeionization device is operated to replenish the pure water tank with pure water. However, such intermittent operation of the electrodeionization apparatus has a problem that it causes insufficient regeneration of the resin and lowers water quality.

このような従来の純水装置の運転方法を、図4に基づいて説明する。
同図において、1は原水を貯留する原水タンク、2は活性炭槽などの前処理装置、3は逆浸透膜装置、5は電気脱イオン装置、6は純水タンクである。
原水タンク1から供給される原水は、前処理装置2に送られてろ過され、ろ過水は、高圧ポンプP1によって、逆浸透膜装置3に送水される。逆浸透膜装置3から排出される逆浸透膜処理水は、電気脱イオン装置5に通水されて脱塩処理が行われ、脱塩水、即ち純水は純水タンク6に貯留される。
なお、逆浸透膜装置3の濃縮水は、濃縮水排水ライン7から排出される。
The operation method of such a conventional pure water apparatus will be described with reference to FIG.
In the figure, 1 is a raw water tank for storing raw water, 2 is a pretreatment device such as an activated carbon tank, 3 is a reverse osmosis membrane device, 5 is an electrodeionization device, and 6 is a pure water tank.
The raw water supplied from the raw water tank 1 is sent to the pretreatment device 2 and filtered, and the filtered water is sent to the reverse osmosis membrane device 3 by the high pressure pump P1. The reverse osmosis membrane treated water discharged from the reverse osmosis membrane device 3 is passed through the electrodeionization device 5 to be desalted, and the desalted water, that is, pure water is stored in the pure water tank 6.
The concentrated water of the reverse osmosis membrane device 3 is discharged from the concentrated water drain line 7.

純水タンク6は、配管を介してユースポイントに接続され、ユースポイントの純水使用目的に応じて純水タンク6内の純水がユースポイントに送られ、消費される。   The pure water tank 6 is connected to a use point through a pipe, and the pure water in the pure water tank 6 is sent to the use point and consumed in accordance with the purpose of using the pure water at the use point.

そして、純水タンク6に供給された純水の量がユースポイントによる純水使用量よりも多くなり、純水タンク6内における原水の水位が上昇し水位が設定上限位置L1に達すると、レベルスイッチLS1が作動し、電気信号により高圧ポンプP1が停止して、逆浸透膜装置3及び電気脱イオン装置5の運転が停止する。   Then, when the amount of pure water supplied to the pure water tank 6 is larger than the amount of pure water used by the use point, the level of raw water in the pure water tank 6 rises, and the water level reaches the set upper limit position L1. The switch LS1 is activated, the high-pressure pump P1 is stopped by the electrical signal, and the operation of the reverse osmosis membrane device 3 and the electrodeionization device 5 is stopped.

この状態でユースポイントで純水が使用され、純水タンク6内の純水の水位が下降して水位が設定下限位置L2にまで下がると、レベルスイッチLS1が作動し電気信号により高圧ポンプP1が再び駆動して逆浸透膜装置3及び電気脱イオン装置5の運転が開始される。純水の消費量によるが、普通は、高圧ポンプP1は、10分程度運転され、10分程度停止という運転状況が繰り返されることが多い。
しかし、このような電気脱イオン装置を断続運転する方法では、運転を停止した後、運転を再開する際に、電気脱イオン装置の出口水の水質が低下して、元の抵抗率に回復するのに時間を要し、結果的に抵抗率の低い出口水しか得られないという問題があった。
In this state, pure water is used at the use point, and when the water level of the pure water in the pure water tank 6 is lowered and the water level is lowered to the set lower limit position L2, the level switch LS1 is activated and the high pressure pump P1 is activated by an electric signal. It drives again and operation | movement of the reverse osmosis membrane apparatus 3 and the electrodeionization apparatus 5 is started. Depending on the consumption of pure water, the high-pressure pump P1 is usually operated for about 10 minutes and is often stopped for about 10 minutes.
However, in such a method of intermittently operating the electrodeionization device, when the operation is resumed after the operation is stopped, the quality of the outlet water of the electrodeionization device is lowered and recovered to the original resistivity. However, it took time, and as a result, only outlet water with low resistivity was obtained.

図5に示すように、逆浸透膜装置3と電気脱イオン装置5の間に、硬度除去装置4を介在させたシステムも知られている。なお、図5に示すシステムは、硬度除去装置4を電気脱イオン装置5の前段に設置した点を除いて、他の装置や運転方法は図4に示したシステムと同様であるので、同一部分に同一符号を付して重複する説明は省略する。   As shown in FIG. 5, a system in which a hardness removing device 4 is interposed between a reverse osmosis membrane device 3 and an electrodeionization device 5 is also known. The system shown in FIG. 5 is the same as the system shown in FIG. 4 except for the point that the hardness removing device 4 is installed at the front stage of the electrodeionization device 5, and therefore the same parts. The same reference numerals are given to the descriptions, and duplicate descriptions are omitted.

しかしながら、このような硬度除去装置4を電気脱イオン装置5の前段に設置した装置においても、断続運転においては、運転の停止状態から運転を再開する際に、電気脱イオン装置の出口水の水質が低下し、元の抵抗率に回復するのに時間を要し、抵抗率の低い出口水しか得られないという問題があった。   However, even in the device in which such a hardness removing device 4 is installed in the front stage of the electrodeionization device 5, the quality of the outlet water of the electrodeionization device when the operation is resumed from the operation stop state in the intermittent operation. There was a problem that it took time to recover to the original resistivity, and only outlet water with low resistivity was obtained.

従来、このような断続運転における運転再開時の電気脱イオン装置5の出口水の水質の低下の原因について、電気脱イオン装置5の運転中に生じる脱塩室内の入口側から出口側に向けて低くなるイオン濃度の勾配が、運転停止中にイオン拡散により消滅し、かつ、断続運転における運転時間が短いとイオン交換樹脂の再生が不十分になり、前段装置の運転再開時に低い抵抗率の水が電気脱イオン装置に供給されてイオン交換樹脂が破化するためと考えられていた。   Conventionally, regarding the cause of the deterioration of the water quality of the outlet water of the electrodeionization device 5 at the time of restarting operation in such intermittent operation, from the inlet side to the outlet side in the demineralization chamber that occurs during the operation of the electrodeionization device 5. If the gradient of the decreasing ion concentration disappears due to ion diffusion during the shutdown, and if the operation time in the intermittent operation is short, the regeneration of the ion exchange resin becomes insufficient, and the water of low resistivity is reduced when the operation of the former apparatus is resumed. Was supplied to the electrodeionization apparatus and the ion exchange resin was considered to be destroyed.

このような点に対処して、例えば、電気脱イオン装置5の出口水放出ラインに、三方弁を介して逆浸透膜装置3の入口水に還流する循環ラインを設け、純水タンク5の水位が設定上限位置L1に達したときに、電気脱イオン装置5で製造された純水の一部又は全部を循環ラインに流すようにして、電気脱イオン装置5を停止させずに、連続的に運転する方法が提案されている(例えば、特許文献1)。   In response to such a point, for example, a circulation line that returns to the inlet water of the reverse osmosis membrane device 3 through a three-way valve is provided in the outlet water discharge line of the electrodeionization device 5, and the water level of the pure water tank 5 is When reaching the set upper limit position L1, a part or all of the pure water produced by the electrodeionization device 5 is allowed to flow through the circulation line, and the electrodeionization device 5 is continuously stopped without stopping. A method of driving has been proposed (for example, Patent Document 1).

また、このような電気脱イオン装置5の出口水放出ラインに循環ラインを設けるようにした純水装置において、起動時に水質の低い処理水が純水タンクに供給されるのを避けるため、起動時の電気脱イオン装置5からの出口水を循環ラインに還流させるとともに、電気脱イオン装置5の電極間に印加する直流電圧を高くしてイオン交換樹脂の再生を促進させ、循環ラインから純水タンク5への給水ラインへの切換え時間を短縮させるようにした純水装置も提案されている(特許文献2)。   In addition, in the deionized water apparatus in which a circulation line is provided in the outlet water discharge line of the electrodeionization apparatus 5, in order to avoid supplying low-quality treated water to the deionized water tank at the time of activation, The outlet water from the electrodeionization device 5 is recirculated to the circulation line, and the DC voltage applied between the electrodes of the electrodeionization device 5 is increased to promote the regeneration of the ion exchange resin. There has also been proposed a deionized water device that shortens the switching time to the water supply line to No. 5 (Patent Document 2).

一般的には、断続運転を前提とするシステムでは、硬度除去装置4を使用したシステムでも電気脱イオン装置5の出口水の抵抗率は10MΩ・cm以下であるが、上述した循環ラインを設けた連続運転方式では、電気脱イオン装置5の出口水の抵抗率を15MΩ・cm以上とすることができる。   In general, in a system based on intermittent operation, the resistivity of the outlet water of the electrodeionization device 5 is 10 MΩ · cm or less even in the system using the hardness removing device 4, but the circulation line described above is provided. In the continuous operation method, the resistivity of the outlet water of the electrodeionization device 5 can be set to 15 MΩ · cm or more.

しかしながら、連続運転方式では、純水タンクが満水状態でも逆浸透膜装置3及び電気脱イオン装置6へ給水するため高圧ポンプP1の運転や電気脱イオン装置6の電極間に直流電圧を印加をし続けるためシステム運転の消費電力が大きくなり、省エネルギーの見地から好ましくないという問題がある。   However, in the continuous operation method, even when the pure water tank is full, water is supplied to the reverse osmosis membrane device 3 and the electrodeionization device 6, so that a DC voltage is applied between the operation of the high pressure pump P1 and the electrode of the electrodeionization device 6. In order to continue, there is a problem that the power consumption of the system operation increases, which is not preferable from the viewpoint of energy saving.

また、電気脱イオン装置は、運転中、濃縮水や電極水の一部又は全部を排出するため、これを補うために水を補給する必要がある。この補給のための水としては、逆浸透膜装置の透過水が用いられているが、逆浸透膜で透過水を得るためには、逆浸透膜装置に供給される原水量に対して10〜50%程度の濃縮水を排出しているため原水使用量も多くなるという問題があった。
さらに、逆浸透膜装置の運転時間が長くなるため、逆浸透膜装置の運転の負荷も大きくなり、逆浸透膜モジュール(ROモジュール)の交換頻度が増加するという問題もあった。
Moreover, since the electrodeionization apparatus discharges part or all of the concentrated water and electrode water during operation, it is necessary to supply water to compensate for this. As the water for replenishment, the permeated water of the reverse osmosis membrane device is used, but in order to obtain the permeated water with the reverse osmosis membrane, the amount of raw water supplied to the reverse osmosis membrane device is 10 to 10. There was a problem that the amount of raw water used increased because about 50% of concentrated water was discharged.
Furthermore, since the operation time of the reverse osmosis membrane device becomes long, the operation load of the reverse osmosis membrane device also increases, and there is a problem that the replacement frequency of the reverse osmosis membrane module (RO module) increases.

特開平9−57271号公報JP-A-9-57271 特開2010−58011号公報JP 2010-58011 A

このように、従来の純水装置では、電気脱イオン装置の断続運転に伴う水質低下を避けるために、ユースポイントへの供給水路とは別に、純水タンクから電気脱イオン装置の上流側に純水を還流させる循環ラインを設け、この循環ラインに純水タンクの純水を還流させることで、電気脱イオン装置の運転を停止させない連続運転方法が採られているが、前述したとおり、連続運転には、省エネルギー、省資源の見地から、改善すべき点が多い。   As described above, in the conventional pure water device, in order to avoid the deterioration of water quality due to the intermittent operation of the electrodeionization device, a pure water tank is supplied from the pure water tank to the upstream side of the electrodeionization device separately from the supply channel to the use point. A continuous operation method that does not stop the operation of the electrodeionization device by recirculating the pure water in the pure water tank to the circulation line is provided. There are many points that need to be improved from the standpoint of energy and resource conservation.

本発明者らは、かかる観点から、断続運転における運転再開時の電気脱イオン装置の出口水の水質向上を図るべく以下の実験を行った。   From these viewpoints, the present inventors conducted the following experiment in order to improve the water quality of the outlet water of the electrodeionization apparatus when restarting operation in intermittent operation.

[実験1]
図4に示した純水システムの逆浸透膜装置3と電気脱イオン装置5間の管路にNaCl水溶液の注入部を設け、その下流側に導電率計とTOC計を取付けた。次に、電気脱イオン装置5の入口水が所定の導電率となるように、逆浸透膜装置3の出口水に、NaCl水溶液を、次に示すタイミングで注入するとともに、電気脱イオン装置の出口水の抵抗率を測定した。
なお、使用した装置及び運転条件は、次のとおりである。
電気脱イオン装置:(MK−3 mini 米国GE社製)
原水:厚木市水
通水率:20L/分
電気脱イオン装置の入口水の導電率:0〜2分→ 約5μS/cm
(NaCl水溶液の添加なし)
2〜4分→約100μS/cm
(NaCl水溶液の添加あり)
4〜6分→約200μS/cm
(NaCl水溶液の添加あり)
6〜8分→約100μS/cm
(NaCl水溶液の添加あり)
8〜10分→約5μS/cm
(NaCl水溶液の添加なし)
この実験による電気脱イオン装置の出口水の抵抗率は、図6に示すとおりであり、入口水の導電率を高くしたことによる電気脱イオン装置の出口水への影響は全く認められなかった。また、電気脱イオン装置への通水は、NaCl水溶液の添加を停止した後も5時間継続したが抵抗率の低下等は認められなかった。
すなわち、上記試験からは、電気脱イオン装置の入口水へのNaCl水溶液の添加による処理水の抵抗率への影響は認められなかった。
[Experiment 1]
An injection part of NaCl aqueous solution was provided in the pipe line between the reverse osmosis membrane device 3 and the electrodeionization device 5 of the pure water system shown in FIG. 4, and a conductivity meter and a TOC meter were attached downstream thereof. Next, an NaCl aqueous solution is injected into the outlet water of the reverse osmosis membrane device 3 at the timing shown below so that the inlet water of the electrodeionization device 5 has a predetermined conductivity, and the outlet of the electrodeionization device. The water resistivity was measured.
In addition, the used apparatus and operating conditions are as follows.
Electrodeionizer: (MK-3 mini manufactured by GE USA)
Raw water: Atsugi City Water flow rate: 20 L / min Electric conductivity of the inlet water of the electrodeionization device: 0 to 2 minutes → about 5 μS / cm
(No addition of NaCl aqueous solution)
2 to 4 minutes → about 100 μS / cm
(NaCl aqueous solution added)
4-6 minutes → about 200 μS / cm
(NaCl aqueous solution added)
6-8 minutes → about 100 μS / cm
(NaCl aqueous solution added)
8-10 minutes → about 5 μS / cm
(No addition of NaCl aqueous solution)
The resistivity of the outlet water of the electrodeionization apparatus by this experiment is as shown in FIG. 6, and no influence on the outlet water of the electrodeionization apparatus due to the increased conductivity of the inlet water was observed. Further, the water flow to the electrodeionization apparatus was continued for 5 hours after the addition of the NaCl aqueous solution was stopped, but no decrease in resistivity was observed.
That is, from the above test, there was no effect on the resistivity of the treated water due to the addition of the NaCl aqueous solution to the inlet water of the electrodeionization apparatus.

[実験2]
次に、図4に示したシステムを1時間連続運転後、24時間停止し、通水率20L/分で運転を再開したときの逆浸透膜装置3の出口水のTOC濃度を測定した。測定結果を図7に示す。図7から、逆浸透膜装置3の運転再開直後にTOCの値が上昇することがわかる。
なお、使用した装置及び運転条件は、それぞれ次のとおりである。
前処理装置:ACボンベ(NCC−200AC 野村マイクロ・サイエンス株式会社製、充填活性炭:活性炭クラレコールKW)2本
逆浸透処理装置:モジュール(東レ株式会社製DOW社製SG30−LE440i)2本、運転圧力0.7MPa、供給流量2m3/h、水回収率60%
電気脱イオン装置:(MK−3 mini 米国GE社製) 1台
原水:厚木市水
通水率:20L/分
[Experiment 2]
Next, the TOC concentration of the outlet water of the reverse osmosis membrane device 3 was measured when the system shown in FIG. 4 was stopped for 24 hours after continuous operation for 1 hour and restarted at a water flow rate of 20 L / min. The measurement results are shown in FIG. From FIG. 7, it can be seen that the TOC value increases immediately after the reverse osmosis membrane device 3 is restarted.
In addition, the apparatus and operating conditions which were used are as follows, respectively.
Pretreatment device: 2 AC cylinders (NCC-200AC Nomura Micro Science Co., Ltd., filled activated carbon: activated carbon Kuraray Coal KW) Reverse osmosis treatment device: 2 modules (Tow Co., Ltd. DOW SG30-LE440i), operation Pressure 0.7 MPa, supply flow rate 2 m 3 / h, water recovery rate 60%
Electrodeionizer: (MK-3 mini manufactured by GE USA) 1 unit Raw water: Atsugi City Water flow rate: 20 L / min

[実験3]
実験2で使用したシステムの逆浸透膜装置の次段に硬度除去装置(三菱化学社製 SK−1B)を介在させ、1時間連続運転し、3時間停止した後、運転を再開したときの逆浸透膜装置の出口水のTOC濃度を測定した。測定結果を図8に示す。図8から、運転再開直後にTOCの値が上昇していることがわかる。
[Experiment 3]
The hardness removal device (SK-1B manufactured by Mitsubishi Chemical Co., Ltd.) is interposed in the next stage of the reverse osmosis membrane device of the system used in Experiment 2, and when the operation is resumed after being continuously operated for 1 hour and stopped for 3 hours. The TOC concentration of the outlet water of the osmotic membrane device was measured. The measurement results are shown in FIG. It can be seen from FIG. 8 that the value of TOC is increasing immediately after resuming operation.

[実験4]
図9に示すように、図5のシステムの硬度除去装置4と電気脱イオン装置5の間に貯水タンク11を設置するとともに、電気脱イオン装置5の純水排出ライン9に純水排出ライン9の純水を貯水タンク11に還流させる循環ライン9aを設けたシステムを用いて以下の実験を行った。なお、電気脱イオン装置の純水排出ライン9の出口水の抵抗は、同ライン9に設置した抵抗計により測定した。
同図中、V3,V4は、電気脱イオン装置5の出口水を循環ライン9aと純水タンク6への送水ライン9bに切替える開閉弁である。この実験では、V3は閉、V4は開として、常に循環の状態とした。また、ポンプP1は、通常は、貯水タンク11のレベルスイッチLS2により、ポンプP2は純水タンク6中のレベルスイッチLS1により、それぞれ所定の水位となるように自動でON−OFF制御される。また、この実験では、電気脱イオン装置5は、ライン9、ライン9aタンク11を経て、常時循環運転し、電気脱イオン装置5の電極間に直流電圧を印加し続けた。
[Experiment 4]
As shown in FIG. 9, a water storage tank 11 is installed between the hardness removing device 4 and the electrodeionization device 5 in the system of FIG. 5, and the purewater discharge line 9 is connected to the purewater discharge line 9 of the electrodeionization device 5. The following experiment was conducted using a system provided with a circulation line 9a for returning the pure water to the water storage tank 11. In addition, the resistance of the outlet water of the pure water discharge line 9 of the electrodeionization apparatus was measured by a resistance meter installed in the line 9.
In the figure, V3 and V4 are open / close valves for switching the outlet water of the electrodeionization device 5 to the circulation line 9a and the water supply line 9b to the pure water tank 6. In this experiment, V3 was closed and V4 was open, so that it was always in a circulating state. Further, the pump P1 is normally automatically turned on and off so as to reach a predetermined water level by the level switch LS2 of the water storage tank 11 and the pump P2 by the level switch LS1 of the pure water tank 6, respectively. In this experiment, the electrodeionization device 5 was continuously circulated through the line 9 and the line 9a tank 11, and a DC voltage was continuously applied between the electrodes of the electrodeionization device 5.

この実験では、タンク11の水位がL2になると、ポンプP1が起動される。そして、概ね1時間後にタンク11の水位はL1に達し、ポンプP1は停止する。その後、ポンプP2、ライン9、ライン9aで、循環運転が行われるが、電気脱イオン装置5では濃縮水が排水されるため、タンク11の水位は、徐々に低下する。そして、14時間後には、タンク11の水位はL2まで低下し、ポンプP1が起動される。この実験では、このようなポンプP1,P2の断続運転が繰り返される。この場合の、電気脱イオン装置5の出口水の抵抗率の変化を測定した。   In this experiment, when the water level of the tank 11 becomes L2, the pump P1 is started. Then, approximately 1 hour later, the water level in the tank 11 reaches L1, and the pump P1 stops. Thereafter, the circulation operation is performed in the pump P2, the line 9, and the line 9a. However, since the concentrated water is drained in the electrodeionization device 5, the water level in the tank 11 gradually decreases. After 14 hours, the water level in the tank 11 drops to L2, and the pump P1 is activated. In this experiment, such intermittent operation of the pumps P1 and P2 is repeated. In this case, the change in the resistivity of the outlet water of the electrodeionization device 5 was measured.

測定結果は、図10に示すとおりであり、運転再開後、抵抗率は、4MΩ・cmまで低下した後 14時間を要しても、およそ14MΩ・cmまでしか、回復しなかった。また、電気脱イオン装置5の供給水の抵抗率は、ポンプP1の運転動作中は一時的に低下するものの、ほぼ2MΩ・cm以上であった。この試験結果からは、抵抗率(すなわち濃度)の観点からは、電気脱イオン装置5の供給水としては問題がない水質が確保されていたことを意味する。
すなわち、電気脱イオン装置5は、常に循環で動いている場合でも、ポンプP1の停止・運転再開の影響を受けることが確認された。これは、逆浸透装置3及び、硬度除去装置4の運転再開時の抵抗率では観測されないような一時的な水質悪化、すなわち、TOCの影響を強く示唆するものである。
以上の実験1〜4の結果から、断続運転における電気脱イオン装置5の出口水の水質の低下は、運転停止時における電気脱イオン装置5内でのイオン濃度勾配の破壊によるよりも、断続運転における運転再開時に短時間放出される前段装置の出口水のTOCが関係している可能性が高いと考えられる。
The measurement results are as shown in FIG. 10, and after restarting the operation, the resistivity was recovered only to about 14 MΩ · cm even if 14 hours were required after it decreased to 4 MΩ · cm. Further, the resistivity of the supplied water of the electrodeionization device 5 was approximately 2 MΩ · cm or more, although it temporarily decreased during the operation of the pump P1. From this test result, from the viewpoint of resistivity (that is, concentration), it is meant that the water quality that has no problem as the supply water of the electrodeionization apparatus 5 has been secured.
That is, it was confirmed that the electrodeionization device 5 is affected by the stop and restart of the pump P1 even when the electrodeionization device 5 is constantly moving. This strongly suggests a temporary deterioration in water quality that is not observed in the resistivity at the time of resuming operation of the reverse osmosis device 3 and the hardness removing device 4, that is, the influence of the TOC.
From the results of the above experiments 1 to 4, the water quality of the outlet water of the electrodeionization device 5 during the intermittent operation is deteriorated rather than due to the destruction of the ion concentration gradient in the electrodeionization device 5 when the operation is stopped. It is considered that there is a high possibility that the TOC of the outlet water of the pre-stage device that is released for a short time at the time of restarting operation is related.

そこで、本発明者らは、断続運転における運転再開時の前段装置の出口水をブローすれば、電気脱イオン装置の出口水の抵抗率の低下を抑制できるとの予測のもとに、電気脱イオン装置の前段装置の出口水の配管にブローラインを設け、断続運転における運転再開時の出口水をブローさせた後、出口水を電気脱イオン装置に供給することを試みたところ、断続運転においても、連続運転並みの高い抵抗率の処理水が得られることを確認した。   Therefore, the present inventors have predicted that if the outlet water of the front-stage device at the time of restarting operation in intermittent operation is blown, the decrease in the resistivity of the outlet water of the electrodeionization device can be suppressed. After setting up a blow line in the outlet water piping of the upstream device of the ion device and blowing the outlet water at the time of resuming operation in intermittent operation, we tried to supply the outlet water to the electrodeionization device. In addition, it was confirmed that treated water with high resistivity equivalent to continuous operation could be obtained.

本発明者らは、さらに検討を重ねたところ、断続運転における運転再開時の前段装置の出口水のTOCの一時的な増加、すなわち、図7、図8に示したようなTOC値の推移のピークの値は、停止時間にほぼ比例し、前段装置の停止時間が1時間未満と短い場合には、かなり少なくなることを確認した。   As a result of further investigations, the present inventors have made a temporary increase in the TOC of the outlet water of the upstream device at the time of restarting operation in intermittent operation, that is, the transition of the TOC value as shown in FIGS. It was confirmed that the peak value was almost proportional to the stop time, and considerably decreased when the stop time of the preceding apparatus was as short as less than 1 hour.

本発明は、かかる知見に基づいてなされたもので、電気脱イオン装置の運転を断続で行っても製造される純水水質の低下を招くことがなく、ユースポイントの純水使用量に応じて純水装置の断続運転制御を行うことのできる、純水装置の運転方法及び運転装置を提供することを目的とする。   The present invention has been made on the basis of such knowledge, and does not cause deterioration of the quality of pure water produced even when the operation of the electrodeionization apparatus is intermittently performed, depending on the amount of pure water used at the point of use. It is an object of the present invention to provide an operation method and an operation device of a pure water device capable of performing intermittent operation control of the pure water device.

本発明の純水装置の運転方法は、少なくとも原水を貯留する原水タンク、逆浸透膜装置、電気脱イオン装置及び前記電気脱イオン装置の処理水を貯留する純水タンクを、流路に沿って有し、前記純水タンクの水位に応じて断続運転される純水装置の運転方法において、前記純水装置の運転再開にあたって、(a)前記電気脱イオン装置の前段に設置された機器で処理された前記電気脱イオン装置の被処理水を所定の時間排水する工程と、(b)前記電気脱イオン装置の前段に設置された機器で処理された前記電気脱イオン装置の被処理水の排水を停止し、前記電気脱イオン装置への前記機器の処理水の供給を開始するとともに、前記電気脱イオン装置の電極間に直流電圧を印加して脱イオン処理を開始する工程とを有することを特徴とする。   The operation method of the pure water apparatus of the present invention includes a raw water tank that stores at least raw water, a reverse osmosis membrane device, an electrodeionization device, and a pure water tank that stores treated water of the electrodeionization device along a flow path. In the operation method of the deionized water device that is intermittently operated according to the water level of the deionized water tank, when resuming the operation of the deionized water device, (a) treatment with equipment installed in the previous stage of the electrodeionization device Draining the treated water of the electrodeionization apparatus for a predetermined time; and (b) draining the treated water of the electrodeionization apparatus treated by equipment installed in the previous stage of the electrodeionization apparatus. And starting the supply of treated water of the equipment to the electrodeionization apparatus, and starting a deionization process by applying a DC voltage between the electrodes of the electrodeionization apparatus. Features.

前記(b)の工程においては、運転開始後所定の時間内に電気脱イオン装置で処理した処理水を排水し、その後の処理水を前記純水タンクに貯留することがより好ましい。
さらに、(a)の工程における電気脱イオン装置の被処理水、又は(b)の工程における電気脱イオン装置の処理水の少なくとも一方の一部又は全部を、前記原水タンク又は前記逆浸透膜装置の供給水に還流させるようにすれば、原水の使用量を、その分だけ少なくすることができる。
In the step (b), it is more preferable to drain the treated water treated by the electrodeionization apparatus within a predetermined time after the start of operation and store the treated water thereafter in the pure water tank.
Further, the raw water tank or the reverse osmosis membrane device is used to treat at least one part or all of the treated water of the electrodeionization apparatus in the step (a) or the treated water of the electrodeionization device in the step (b). If the feed water is refluxed, the amount of raw water used can be reduced accordingly.

また、本発明の純水の製造装置は、少なくとも原水を貯留する原水タンク、逆浸透膜装置、電気脱イオン装置及び前記電気脱イオン装置の処理水を貯留する純水タンクを、流路に沿って有し、前記純水タンクの水位に応じて断続運転される純水装置において、前記電気脱イオン装置の前段の機器から前記電気脱イオン装置への供給水の供給ラインから分岐する排水ラインと、前記前段の機器から前記電気脱イオン装置への供給水を前記排水ラインに送水させる弁装置と、前記弁装置を、前記前段機器の処理水が前記前段機器の運転開始から所定の時間前記排水ラインに送水され、その後前記電気脱イオン装置へ送水されるように制御する制御装置とを有することを特徴とする。   The pure water production apparatus of the present invention includes a raw water tank that stores at least raw water, a reverse osmosis membrane device, an electrodeionization device, and a pure water tank that stores treated water of the electrodeionization device along a flow path. A pure water apparatus that is intermittently operated according to the water level of the pure water tank, and a drain line that branches from a supply water supply line to the electrodeionization apparatus from a device preceding the electrodeionization apparatus; A valve device that feeds water supplied from the preceding device to the electrodeionization device to the drainage line, and the valve device, wherein the treated water of the preceding device is discharged for a predetermined time from the start of operation of the preceding device. And a control device for controlling the water to be fed to the line and then to the electrodeionization device.

前記ブローした排水は、前記原水タンク又は逆浸透膜装置の入口水に還流させることが好ましい。
また、本発明の純水装置は、前記電気脱イオン装置から前記純水タンクへの純水の供給ラインから分岐する循環ラインと、前記電気脱イオン装置からの純水を、前記循環ラインに送水させる弁装置と、前記弁装置を、前記電気脱イオン装置の処理水が前記電気脱イオン装置の運転開始から所定の時間前記循環ラインに送水され、その後前記純水タンクに送水されるように制御する制御装置と純水を前記電気脱イオン装置の分岐する循環ラインと、を有していることが好ましい。
なお、弁装置としては、電磁弁、モーター弁、三方弁など本発明の目的に沿う弁装置であれば特に、制限はない。
断続運転を行う純水装置の運転再開時に電気脱イオン被処理水を所定の時間排水する工程を初期ブローと記載する。
The blown waste water is preferably returned to the inlet water of the raw water tank or the reverse osmosis membrane device.
Further, the pure water apparatus of the present invention is configured to supply a circulation line branched from a pure water supply line from the electrodeionization apparatus to the purewater tank, and supply pure water from the electrodeionization apparatus to the circulation line. And the valve device to control the treated water of the electrodeionization device to be sent to the circulation line for a predetermined time from the start of operation of the electrodeionization device and then to the pure water tank. And a circulation line for branching the pure water into the electrodeionization device.
The valve device is not particularly limited as long as it is a valve device that meets the object of the present invention, such as a solenoid valve, a motor valve, or a three-way valve.
The process of draining the electrodeionized water to be treated for a predetermined time when restarting the operation of the pure water apparatus that performs intermittent operation is referred to as initial blow.

本発明の第1の実施形態の構成図。The block diagram of the 1st Embodiment of this invention. 本発明の第1の実施形態における電気脱イオン装置の処理水の抵抗率を示すグラフ。The graph which shows the resistivity of the treated water of the electrodeionization apparatus in the 1st Embodiment of this invention. 本発明の第2の実施形態の構成図。The block diagram of the 2nd Embodiment of this invention. 従来の純水装置の一例の構成図。The block diagram of an example of the conventional pure water apparatus. 従来の純水装置の他の例の構成図。The block diagram of the other example of the conventional pure water apparatus. 実験1における電気脱イオン装置の出口水の抵抗率を示すグラフ。The graph which shows the resistivity of the outlet water of the electrodeionization apparatus in Experiment 1. 実験2における運転再開時の逆浸透膜装置の出口水のTOC濃度の変化を示すグラフ。The graph which shows the change of the TOC density | concentration of the outlet water of a reverse osmosis membrane apparatus at the time of the restart of operation in Experiment 2. 実験3における運転再開時の硬度除去装置の出口水のTOC濃度の変化を示すグラフ。The graph which shows the change of the TOC density | concentration of the outlet water of the hardness removal apparatus at the time of the operation | movement restart in Experiment 3. FIG. 実験4に用いた純水装置の構成図。The block diagram of the pure water apparatus used for Experiment 4. FIG. 実験4における電気脱イオン装置の出口水の抵抗率の変化を示すグラフ。The graph which shows the change of the resistivity of the outlet water of the electrodeionization apparatus in Experiment 4.

(第1の実施形態)
(実施形態1)
図1は、この実施形態のシステム構成図である。
この実施形態は、従来システムと同様に、主に、原水タンク1、前処理装置2、逆浸透膜装置3、電気脱イオン装置5及び純水タンク6から構成される。
原水タンク1は、原水を貯留するタンクであり、前処理装置2は原水中のゴミ等の夾雑物や次亜塩素酸を除去するための活性炭をろ過材としたろ過装置である。
(First embodiment)
(Embodiment 1)
FIG. 1 is a system configuration diagram of this embodiment.
This embodiment is mainly composed of a raw water tank 1, a pretreatment device 2, a reverse osmosis membrane device 3, an electrodeionization device 5, and a pure water tank 6, as in the conventional system.
The raw water tank 1 is a tank for storing raw water, and the pretreatment device 2 is a filtration device using activated carbon for removing impurities such as dust and hypochlorous acid in the raw water as a filter medium.

逆浸透膜装置3は、電気脱イオン装置5の前段に設置され、原水中のカルシウム、マグネシウム等の硬度成分やその他の不純物イオン等を除去する。逆浸透膜装置3の濃縮水は、濃縮水排出ライン7から排出される。逆浸透膜装置3の出口水排出ライン8は途中でブローライン8aと電気脱イオン装置5への送水ライン8bとに分岐し、分岐部近傍の各ラインには、それぞれ電磁開閉弁V1,V2が設けられている。   The reverse osmosis membrane device 3 is installed in front of the electrodeionization device 5 and removes hardness components such as calcium and magnesium in the raw water and other impurity ions. The concentrated water of the reverse osmosis membrane device 3 is discharged from the concentrated water discharge line 7. The outlet water discharge line 8 of the reverse osmosis membrane device 3 is branched into a blow line 8a and a water supply line 8b to the electrodeionization device 5 on the way, and electromagnetic open / close valves V1 and V2 are respectively provided in the lines near the branch portion. Is provided.

電気脱イオン装置5は、カチオン交換膜とアニオン交換膜との間にイオン交換樹脂等のイオン交換体を充填して複数の平行する脱塩室を構成し、各脱塩室間に濃縮室を構成するとともに、これらの流路を挟んでその両側に陽極と陰極とを配置して構成されており、脱塩室および濃縮室に逆浸透膜装置3の処理水が通水される。   The electrodeionization apparatus 5 comprises a plurality of parallel demineralization chambers by filling an ion exchanger such as an ion exchange resin between a cation exchange membrane and an anion exchange membrane, and a concentration chamber is provided between the demineralization chambers. In addition, the anode and the cathode are arranged on both sides of these flow paths, and the treated water of the reverse osmosis membrane device 3 is passed through the desalting chamber and the concentration chamber.

電気脱イオン装置5の出口側には純水排出ライン9が接続されている。この純水排出ライン9は、途中で循環ライン9aと純水タンク6への送水ライン9bとに分岐し、分岐点近傍には、それぞれ電磁開閉弁V3,V4が設けられる。
電磁開閉弁V3,V4は、常時は、V3が開、V4が閉とされているが、必要に応じて、V3を閉、V4を開に切り替えて、ポンプP1を運転状態にしたまま、純水タンク6への送水を停止できるようになっている。循環ライン9aの管端は、例えば、高圧ポンプP1の入口側(又は原水タンク1)に接続される。
A pure water discharge line 9 is connected to the outlet side of the electrodeionization device 5. This pure water discharge line 9 branches in the middle into a circulation line 9a and a water supply line 9b to the pure water tank 6, and electromagnetic on-off valves V3 and V4 are provided in the vicinity of the branch points, respectively.
The electromagnetic on-off valves V3 and V4 are normally open with V3 and closed with V4. However, if necessary, the V3 is closed and the V4 is opened and the pump P1 is kept in operation. Water supply to the water tank 6 can be stopped. The pipe end of the circulation line 9a is connected to, for example, the inlet side (or the raw water tank 1) of the high-pressure pump P1.

なお、後述するように、純水タンク6の貯水量が、設定上限位置L1に達したときは、レベルスイッチLS1が働いてポンプP1の運転が停止するので、循環ライン9aへの切り替えは、必ずしも必要ではない。
なお、図示を省略したが、逆浸透膜装置3の濃縮水排出ライン7も高圧ポンプP1の入口側に接続してもよく、原水タンク1へ返送してもよい。
As will be described later, when the amount of water stored in the pure water tank 6 reaches the set upper limit position L1, the level switch LS1 operates and the operation of the pump P1 is stopped. Not necessary.
Although not shown, the concentrated water discharge line 7 of the reverse osmosis membrane device 3 may also be connected to the inlet side of the high-pressure pump P1, or may be returned to the raw water tank 1.

逆浸透膜装置3の濃縮水排出ライン7、及び電気脱イオン装置5の循環ライン9aは、全量返送するようにしても、一部が純水装置の系外に排出されるようにしてもよい。   The concentrated water discharge line 7 of the reverse osmosis membrane device 3 and the circulation line 9a of the electrodeionization device 5 may be returned in their entirety or partly discharged outside the system of the pure water device. .

この純水装置は、次のように運転制御される。
純水タンク6には電気脱イオン装置5により脱塩処理された純水が貯留されてユースポイントの使用に供される。純水タンク6内にはレベルスイッチLS1の水位検知部が設けられ、純水タンク6内の純水の水位の設定上限位置L1及び設定下限位置L2になったことを検知して電気信号を出力し、この電気信号により高圧ポンプP1及び電磁開閉弁V1,V2が制御される。
This pure water apparatus is operated and controlled as follows.
The pure water tank 6 stores pure water that has been desalted by the electrodeionization device 5 and is used for use points. In the pure water tank 6, a water level detection unit of the level switch LS1 is provided, which detects that the pure water level in the pure water tank 6 has reached the set upper limit position L1 and the set lower limit position L2, and outputs an electrical signal. The high-pressure pump P1 and the electromagnetic on-off valves V1 and V2 are controlled by this electric signal.

電気脱イオン装置5の断続運転における運転停止時には、純水タンク6の水位は設定上限位置L1と設定下限位置L2の間にあるが、ユースポイントにおける純水の使用により、純水タンク6内の水位が下がり、水位が設定下限位置L2になるとレベルスイッチLS1が検知し電気信号を発生する。
この電気信号により、高圧ポンプP1が運転を開始し、同時に、電磁開閉弁V1が開、V2が閉となり、タイマーにより、所定の時間、例えば、最大で15〜20分、装置によっては1〜15分経過後に電磁開閉弁V1が閉、V2が開に切換えられる。そして、電気脱イオン装置5の電極間に直流電圧が印加される。なお、電気脱イオン装置5の電極間に直流電圧を印加する時期は、ブロー開始前でも構わない。
また、この、ブロー時間は、ラインの組み方、ラインの長さ等で変化するので、立ち上げ時の水質の経時変化を実測した上で決定するようにしてもよい。この場合、装置を3時間以上停止した後、運転を再開し、この際の水質(TOC)の経時変化を実測する。実測値の経時変化から、TOC値がピークに達した後、ピーク時のTOC値に対し、好ましくは、60%、より好ましくは70%、さらに、好ましくは、85%までTOCが低下した時間を、ブロー終了時間とすれば最適なブローが可能である。このようにして定めると、不要なブローをせずに済むという効果があり、より好ましい。なお、ピーク時のTOC値に対し、60%まで低下しないうちにブローを中止した場合には、電気脱イオン装置5の水質の低下という不具合が生じ、十分な効果が得られない。
When the operation of the electrodeionization device 5 is stopped during the intermittent operation, the water level of the pure water tank 6 is between the set upper limit position L1 and the set lower limit position L2. However, due to the use of pure water at the use point, When the water level falls and the water level reaches the set lower limit position L2, the level switch LS1 detects and generates an electrical signal.
By this electric signal, the high pressure pump P1 starts operation, and at the same time, the electromagnetic on-off valve V1 is opened and V2 is closed, and a predetermined time, for example, 15 to 20 minutes at the maximum by a timer, 1 to 15 depending on the apparatus. After a minute has elapsed, the electromagnetic on-off valve V1 is closed and V2 is switched to open. Then, a DC voltage is applied between the electrodes of the electrodeionization device 5. The timing for applying the DC voltage between the electrodes of the electrodeionization device 5 may be before the start of blowing.
Further, since the blow time varies depending on the way of assembling the line, the length of the line, etc., the blow time may be determined after actually measuring the temporal change in water quality at the time of start-up. In this case, after stopping the apparatus for 3 hours or more, the operation is restarted, and the change with time of the water quality (TOC) at this time is measured. From the time-dependent change of the actual measurement value, the time when the TOC has decreased to 60%, more preferably 70%, and more preferably 85% of the TOC value at the peak after the TOC value reaches the peak. If the blow end time is set, optimum blow is possible. This determination is more preferable because there is an effect that unnecessary blowing is not required. If the blow is stopped before the peak TOC value is reduced to 60%, there is a problem that the water quality of the electrodeionization device 5 is deteriorated, and a sufficient effect cannot be obtained.

以上の電磁開閉弁V1,V2のタイマー制御は、システムの起動時にも同様に行われる。
したがって、電気脱イオン装置の断続運転において、起動時や運転再開後、所定の時間が経過するまでは、逆浸透膜3の処理水は、ブローライン8aから放出され、所定の時間経過後に電気脱イオン装置5に供給されるようになる。
電磁開閉弁V3,V4の切換えは、断続運転の頻度が高く、電気脱イオン装置5のイオン交換樹脂の再生が不十分になるおそれがある場合に行われる。この場合、V3を閉、弁V4を開とすることにより、純水タンク6内の水位に関係なく高圧ポンプP1は一時的に連続運転状態とされる。
The timer control of the electromagnetic on / off valves V1 and V2 is performed in the same manner when the system is started.
Therefore, in the intermittent operation of the electrodeionization apparatus, the treated water of the reverse osmosis membrane 3 is discharged from the blow line 8a until a predetermined time elapses after starting or after restarting the operation, and the electrodeionization is performed after the predetermined time elapses. It is supplied to the ion device 5.
Switching of the electromagnetic on-off valves V3 and V4 is performed when the frequency of intermittent operation is high and there is a possibility that regeneration of the ion exchange resin of the electrodeionization apparatus 5 may be insufficient. In this case, by closing V3 and opening the valve V4, the high-pressure pump P1 is temporarily in a continuous operation state regardless of the water level in the pure water tank 6.

逆浸透膜装置の後段に硬度除去装置が配置される場合においても、装置の運転再開時に硬度除去装置処理水を初期ブローすることで同様の結果を得ることができる。また、逆浸透膜装置運転再開時に逆浸透膜装置処理水の初期ブローを行った後、電気脱イオン装置処理水の初期ブローを行うようにすれば、より一層、抵抗率の高い電気脱イオン装置処理水を純水タンクに送ることができる。また、装置構成に限定されることなく、電気脱イオン装置の前段装置の処理水を初期ブローすることにより同様の効果を得ることが可能である。   Even in the case where the hardness removing device is arranged at the subsequent stage of the reverse osmosis membrane device, the same result can be obtained by initially blowing the hardness removing device treated water when the operation of the device is resumed. In addition, if the initial blow of the reverse osmosis membrane device treated water is performed after the reverse osmosis membrane device operation is restarted, then the electrical deionization device with higher resistivity can be obtained. Treated water can be sent to a pure water tank. Moreover, it is possible to acquire the same effect by initially blowing the treated water of the front | former apparatus of an electrodeionization apparatus, without being limited to an apparatus structure.

(実施例)
次に本発明の実施例及び比較例について説明する。
なお、実施例及び比較例に使用した原水、使用装置等は次のとおりである。
[原水]:厚木市水
[装置]
前処理装置:ACボンベ(NCC−200AC 野村マイクロ・サイエンス株式会社製、充填活性炭:活性炭クラレコールKW)2本
逆浸透処理装置:モジュール(DOW社製SG30−LE440i)2本、運転圧力0.7MPa、供給流量2m/h、水回収率60%
電気脱イオン装置:(MK−3 GE社製)1台
電磁開閉弁V1と逆浸透処理装置3(又は硬度除去装置4)間の配管:25mmφ(内径)×2.5m(長さ)
通水率:20L/分
(Example)
Next, examples and comparative examples of the present invention will be described.
In addition, the raw water, the used apparatus, etc. which were used for the Example and the comparative example are as follows.
[Raw Water]: Atsugi City Water [Equipment]
Pretreatment device: 2 AC cylinders (NCC-200AC Nomura Micro Science Co., Ltd., filled activated carbon: activated carbon Kuraray Coal KW) Reverse osmosis treatment device: 2 modules (DOW SG30-LE440i), operating pressure 0.7 MPa Supply flow rate 2m 3 / h, water recovery rate 60%
Electrodeionization device: (MK-3 manufactured by GE) 1 unit Piping between electromagnetic on-off valve V1 and reverse osmosis treatment device 3 (or hardness removal device 4): 25 mmφ (inner diameter) × 2.5 m (length)
Water flow rate: 20L / min

図1に示すように、純水タンク1、前処理装置2、逆浸透処理装置3、電気脱イオン装置5及び純水タンク6を含むラインを組んで、純水タンク6内のレベルスイッチLS1によってラインを30分運転、30分停止で断続運転させた。
断続運転における運転開始時には、弁V1を開、弁V2を閉にして、2分間ブローを行った後、V1を閉、V2を開にして、通常運転に切り替えた。
上記運転時の電気脱イオン装置3の処理水水質の経時変化は図2に示すとおりであり、透過水水質は、ほぼ17MΩ・cm以上で高水質を保っていた。
As shown in FIG. 1, a line including a pure water tank 1, a pretreatment device 2, a reverse osmosis treatment device 3, an electrodeionization device 5 and a pure water tank 6 is assembled, and a level switch LS1 in the pure water tank 6 is used. The line was operated for 30 minutes and stopped for 30 minutes.
At the start of intermittent operation, the valve V1 was opened, the valve V2 was closed, and blowing was performed for 2 minutes, and then V1 was closed and V2 was opened to switch to normal operation.
The time-dependent change of the treated water quality of the electrodeionization apparatus 3 during the above operation is as shown in FIG. 2, and the permeated water quality was approximately 17 MΩ · cm or more and the high water quality was maintained.

図3に示すように、図9に示した純水装置の硬度除去装置の出口水側の配管から、ブローライン8aを分岐させ、断続運転における運転開始時には、電磁開閉弁V1,V2により、弁V1を開、弁V2を閉にして、2分間ブローを行うようにして、実施例1と同一条件で断続運転を行った。
この断続運転による電気脱イオン装置6の透過水の抵抗率は、17MΩ・cm以上であった。
As shown in FIG. 3, the blow line 8a is branched from the outlet water side pipe of the hardness removing device of the pure water device shown in FIG. 9, and at the start of operation in the intermittent operation, the solenoid on-off valves V1, V2 Intermittent operation was performed under the same conditions as in Example 1 with V1 open, valve V2 closed and blow for 2 minutes.
The resistivity of the permeated water of the electrodeionization apparatus 6 by this intermittent operation was 17 MΩ · cm or more.

Claims (6)

少なくとも原水を貯留する原水タンク、逆浸透膜装置、電気脱イオン装置及び前記電気脱イオン装置の処理水を貯留する純水タンクを、流路に沿って有し、前記純水タンクの水位に応じて断続運転される純水装置の運転方法であって、
前記純水装置の運転再開にあたって、
(a)前記電気脱イオン装置の前段に設置された機器で処理された前記電気脱イオン装置の被処理水を所定の時間排水する工程と、
(b)前記電気脱イオン装置の前段に設置された機器で処理された前記電気脱イオン装置の被処理水の排水を停止し、前記電気脱イオン装置への前記機器の処理水の供給を開始するとともに、前記電気脱イオン装置の電極間に直流電圧を印加して脱イオン処理を開始する工程と、
を有することを特徴とする純水装置の運転方法。
At least a raw water tank that stores raw water, a reverse osmosis membrane device, an electrodeionization device, and a pure water tank that stores treated water of the electrodeionization device, along the flow path, according to the water level of the pure water tank A method of operating a deionized water device that is intermittently operated,
In resuming operation of the pure water device,
(A) draining the water to be treated of the electrodeionization apparatus treated by equipment installed in the previous stage of the electrodeionization apparatus for a predetermined time;
(B) Stop the drainage of the treated water of the electrodeionization apparatus treated by the equipment installed in the previous stage of the electrodeionization apparatus, and start supplying the treated water of the equipment to the electrodeionization apparatus And starting a deionization process by applying a DC voltage between the electrodes of the electrodeionization device;
A method for operating a deionized water device, comprising:
前記(b)の工程において、運転開始後所定の時間内に電気脱イオン装置が処理した処理水を排水し、その後処理した処理水を前記純水タンクに貯留することを特徴とする請求項1記載の純水装置の運転方法。   In the step (b), the treated water treated by the electrodeionization apparatus is drained within a predetermined time after the start of operation, and then the treated water treated is stored in the pure water tank. The operation method of the pure water apparatus of description. (a)の工程又は(b)の工程における排水の少なくとも一方の一部又は全部を、前記原水タンク又は前記逆浸透膜装置の供給水に還流させることを特徴とする請求項1又は2に記載の純水装置の運転方法。 The part or all of at least one of the waste water in the step (a) or the step (b) is returned to the feed water of the raw water tank or the reverse osmosis membrane device. Operation method of pure water equipment. 少なくとも原水を貯留する原水タンク、逆浸透膜装置、電気脱イオン装置及び前記電気脱イオン装置の処理水を貯留する純水タンクを、流路に沿って有し、前記純水タンクの水位に応じて断続運転される純水装置において、
前記電気脱イオン装置の前段の機器から前記電気脱イオン装置への供給水の供給ラインから分岐する排水ラインと、
前記前段の機器から前記電気脱イオン装置への供給水を前記排水ラインに送水させる弁装置と、
前記弁装置を、前記前段機器の処理水が前記前段機器の運転開始から所定の時間前記排水ラインに送水され、その後前記電気脱イオン装置へ送水されるように制御する制御装置と
を有することを特徴とする純水装置。
At least a raw water tank that stores raw water, a reverse osmosis membrane device, an electrodeionization device, and a pure water tank that stores treated water of the electrodeionization device, along the flow path, according to the water level of the pure water tank In a pure water device that is intermittently operated,
A drainage line that branches off from a supply line of water supplied to the electrodeionization device from the preceding device of the electrodeionization device;
A valve device that feeds water supplied from the preceding device to the electrodeionization device to the drainage line;
A control device for controlling the valve device so that the treated water of the preceding device is fed to the drain line for a predetermined time from the start of operation of the preceding device and then to the electrodeionization device. A pure water device.
前記排水ラインの排水を前記原水タンクに還流させることを特徴とする請求項4記載の純水装置。   The pure water apparatus according to claim 4, wherein the drainage of the drainage line is returned to the raw water tank. 前記電気脱イオン装置から前記純水タンクへの純水の供給ラインから分岐する循環ラインと、
前記電気脱イオン装置からの純水を、前記循環ラインに送水させる弁装置と、
前記弁装置を、前記電気脱イオン装置の処理水が前記電気脱イオン装置の運転開始から所定の時間前記循環ラインに送水され、その後前記純水タンクに送水されるように制御する制御装置と
純水を前記電気脱イオン装置の分岐する循環ラインと、
を有することを特徴とする請求項5記載の純水装置。
A circulation line branched from a pure water supply line from the electrodeionization device to the pure water tank;
A valve device for feeding pure water from the electrodeionization device to the circulation line;
A control device for controlling the valve device so that treated water of the electrodeionization device is supplied to the circulation line for a predetermined time from the start of operation of the electrodeionization device and then to the pure water tank; A circulation line for branching water from the electrodeionization device;
The deionized water device according to claim 5, comprising:
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