Apparatus and method for producing purified water having...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/44 (2006.01) B01D 61/02 (2006.01) B01D 61/04 (2006.01) B01D 61/08 (2006.01) B01D 61/12 (2006.01) B01D 65/02 (2006.01) A61M 1/16 (2006.01)

Patent

CA 2464416

A process is provided to produce water that will meet the specifications of the United States Pharmacopeia Inc. for Purified Water and Water for Injection, and water for dialysis as circumscribed by the American Association for Advancement of Medical Instrumentation (AAMI). The system has no storage tanks where stagnant water will be fouled by biofilm colonizing the tank surface. Water is circulated throughout the purification system and drawn as required, on demand. The water is purified and used immediately or recycled and repurified to ensure quality. Sanitation of the purification system, maintaining microbiological purity and cleaning is done by controlling the pH so that it is normally acidic by maintaining a high carbon dioxide concentration in solution, the carbon dioxide being allowed to pass into the permeate from a reverse osmosis membrane assembly (72,74) used to purify the water.

L'invention concerne un procédé destiné à produire de l'eau satisfaisant les spécifications de Pharmacopée Inc. des Etats-Unis en vue d'obtenir de l'eau purifiée et de l'eau pour injection, et de l'eau pour dialyse telle que le prévoit l'American Association for Advancement of Medical Instrumentation (AAMI). Le système ne comporte pas de réservoirs de stockage dans lesquels une eau stagnante serait salie par un biofilm colonisant la surface de réservoirs. L'eau est mise en circulation dans tout le système de purification et extraite selon les besoins, à la demande. L'eau est purifiée et est utilisée immédiatement ou recyclée et repurifiée pour garantir sa qualité. L'assainissement du système de purification, le maintien de la pureté microbiologique et le nettoyage sont effectués par régulation du pH de manière qu'il est normalement acide par maintien d'une concentration élevée en dioxyde de carbone en solution, le dioxyde de carbone étant admis à passer dans le perméat à partir d'une ensemble membrane à osmose inverse (72, 74) utilisé pour purifier l'eau.

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