Treatment of alkaline streams

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/66 (2006.01) B01F 3/08 (2006.01) B01F 5/04 (2006.01) B01F 15/02 (2006.01) B01F 15/04 (2006.01) G05D 21/02 (2006.01)

Patent

CA 2021545

Efficient control of the pH of a flowing alkaline wastewater stream is accomplished by monitoring the pH of the flowing stream, generating a signal in response to the pH monitored, and injecting CO2 as necessary to reduce the pH. High pressure liquid CO2 is supplied to a proportional control valve which is operated in response to the signal to change the high pressure CO2 fluid to an intermediate pressure CO2 fluid in a manner so as to significantly reduce its density by creating a significant gaseous fraction. This lower density CO2 fluid is supplied to a spring-loaded injector having an orifice in communication with the flowing stream. The intermediate pressure is above the pressure at which the injector opens whereby the lower density CO2 fluid is injected into the flowing stream, allowing particularly precise control to be achieved.

La régulation efficace du pH d'un courant d'eaux usées alcalines en écoulement est réalisée par la surveillance du pH du courant en écoulement, laquelle surveillance génère un signal en réponse au pH déterminé, et par injection de la quantité de CO2 nécessaire pour réduire le pH. Du CO2 liquide haute pression alimente une soupape de régulation à action proportionnelle qui fonctionne en réponse au signal pour changer le CO2 liquide haute pression en CO2 liquide de pression intermédiaire de manière à réduire substantiellement sa densité par la création d'une fraction gazeuse importante. Ce CO2 liquide de densité plus faible alimente un injecteur à ressort muni d'un orifice en communication avec le courant en écoulement. La pression intermédiaire est supérieure à la pression à laquelle l'injecteur s'ouvre pour permettre l'injection du CO2 liquide de densité plus faible dans le courant en écoulement, ce qui permet de réaliser une régulation particulièrement précise.

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