Method and apparatus for fluid treatment by reverse osmosis...

B - Operations – Transporting – 01 – D

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B01D 61/00 (2006.01) B01D 61/02 (2006.01) B01D 61/04 (2006.01) B01D 63/00 (2006.01) C02F 1/44 (2006.01)

Patent

CA 2484662

A process for treatment of water via membrane separation equipment (Fig.2). A feedwater (10) is maintained or adjusted to a pH of 4.3 or lower, and fed to a membrane separation system. In this manner, species such as TOC become more ionized, and (a) their rejection by the membrane separation process is significantly increased, and (b) their solubility in the reject stream from the membrane process is significantly increased. Passage of TOC through the membrane is significantly reduced. A recovery ratio of eighty percent (80%) or higher is achievable with most feedwaters, while simultaneously achieving a substantial reductio in cleaning frequency of the membrane separation equipment. The method is particularly useful for the preparation of high purity water (54).

La présente invention a trait à un procédé de traitement de l'eau par l'intermédiaire d'un système de séparation membranaire (Fig. 2). Une eau d'alimentation (10) est maintenue ou réglée à un pH égal ou inférieur à 4,3, et alimentée à un système de séparation membranaire. Ainsi, des espèces, telles que le carbone organique total, deviennent plus ionisées, et (a) leur rejet par le procédé de séparation membranaire est augmenté, et (b) leur solubilité dans le flot de rejet est nettement accrue. Le passage de carbone organique total à travers la membrane est nettement réduit. Un taux de récupération d'au moins quatre-vingts pour-cent (80%) est obtenu avec la plupart des eaux d'alimentation, tout en réalisant simultanément une réduction sensible dans la fréquence de nettoyage du matériel de séparation membranaire. Le procédé est particulièrement utile pour la préparation d'eau de haute pureté (54)

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