脱イオン水の製造方法

Production method of deionized water

Abstract

PROBLEM TO BE SOLVED: To provide a deionized water production method which enables the electrical resistance of an electrical water deionizer to be reduced by a radical improvement in structure of the deionizer without adding any chemical agent to concentrated water, to inhibit scale from being formed in concentration chambers and to perform stable production of deionized water having high grade water quality over a long period. SOLUTION: This electrical water deionizer 10 is provided with a deionization chamber D1 that is formed by packing two small deionization chambers d1 and d2, which are divided by a cation exchange membrane on one side, an anion exchange membrane 4 on the other side and a central intermediate ion exchange membrane 5, with an ion exchanger 8; and a pair of concentration chambers 1 which are placed on the both sides of the deionization chamber D1 through the cation exchange membrane 3 and anion exchange membrane 4 respectively. This production process using the water deionizer 10 comprises allowing water to be treated to flow into one small deionization chamber d2 while applying a voltage to the deionizer 10; then allowing outflow water from the chamber d2 to flow into the other small deionization chamber d1; and concurrently, allowing concentrated water into the concentration chambers 1, to remove impurity ions in the water to be treated and to produce the objective deionized water; wherein the water to be treated and the concentrated water are allowed to flow into the small deionization chamber and the concentrated chambers 1 respectively, at their respective flow rates sufficient to provide a flow rate ratio of the water to be treated to the concentrated water of 2:1 to 8:1.
(57)【要約】 (修正有) 【課題】 濃縮水へ薬剤を添加することなく、構造面か らの抜本的な改善により電気抵抗を低減すると共に、濃 縮室内でのスケール発生防止を抑制することのでき、且 つ高度の水質を長期間に渡り安定して得ることができる 電気式脱イオン水の製造方法を提供する。 【解決手段】 一側のカチオン交換膜3、他側のアニオ ン交換膜4及び中央の中間イオン交換膜5で区画される 2つの小脱塩室d 1 、d 2 にイオン交換体8を充填して 脱塩室D 1 を構成し、カチオン交換膜、アニオン交換膜 を介して脱塩室の両側に濃縮室1を設け、電気式脱イオ ン水製造装置70を形成した。電圧を印加しながら一方 の小脱塩室d 2 に被処理水を流入し、次いで、小脱塩室 d 2 の流出水を他方の焼脱塩室d 1 に流入すると共に、 濃縮室に濃縮水を流入して被処理水中の不純物イオンを 除去し、脱イオ水を製造する方法において、被処理水と 濃縮水の流量比が2:1〜8:1となるように、被処理 水及び濃縮水をそれぞれ小脱塩室及び濃縮室に流入する ようにした。

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