An activated carbon treated by carbon dioxide for the...

Details An activated carbon treated by carbon dioxide for the... An activated carbon treated by carbon dioxide for the...

C - Chemistry, Metallurgy

01

B

C01B 31/10 (2006.01) C01B 31/08 (2006.01) C02F 1/28 (2006.01)

Patent

CA 2244820

Treatment of a wet activated carbon with carbon dioxide or with carbon dioxide followed by air results in a carbon having a reduced contact pH. The activated carbon is characterized by a modified contact pH less than about 9.0 and typically between about 7.3 and 9Ø Use of this carbon in a water treatment system eliminates the excessive effluent water pH rise which commonly occurs with activated carbon. Also, use of this caption in a water treatment system reduces the aluminum concentration of the water when compared to an untreated carbon.

Cette invention concerne le traitement de carbone actif mouillé à l'aide de dioxyde de carbone, lequel traitement est éventuellement suivi d'un traitement par air, et permet d'obtenir un carbone possédant un pH de contact réduit. Ce carbone actif se caractérise par un pH de contact modifié qui est inférieur à environ 9,0 et qui, de préférence, varie entre environ 7,3 et 9,0. L'utilisation de ce carbone dans des systèmes de traitement des eaux permet de supprimer toute élévation excessive du pH des effluents, comme cela se produit souvent lorsque l'on utilise du carbone actif. L'utilisation de ce carbone dans un système de traitement des eaux permet également, à la différence du carbone non traité, de réduire la concentration en aluminium de ces dernières.

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