Method of treating strongly acid wastewater containing toxic...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/28 (2006.01) C02F 1/52 (2006.01) C02F 1/66 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2561358

A method of treating a strongly acid wastewater containing a harmful substance. By the method, harmful substances such as fluorine, boron, copper, lead, arsenic, hexavalent chromium, and cadmium can be safely removed from wastewaters without fail. The method, which is for treating a strongly acid liquid (1A) containing a harmful substance, comprises conducting the following steps in this order: an adsorption/precipitation step (S1) in which hydroxyapatite (11) is mixed with the strongly acid liquid (1A) to precipitate the harmful substance as a solid matter; a neutralization step (S2) in which an alkaline substance (12) is mixed with the treated acid liquid (3A) containing the solid matter precipitated to neutralize the liquid (3A); and a coagulation step (S3) in which the treated liquid (4A) which has been neutralized is mixed with a coagulant (13) to coagulate the solid matter precipitated. The harmful substance in the strongly acid liquid (1A) can be effectively fixed and can be removed in a safe form. The concentration of the harmful substance in the liquid can be lowered through the treatment. There is no need of heating the liquid in each step and the treatment can be carried out at ordinary temperature. The harmful substance can hence be treated safely.

Il est prévu un procédé de traitement d'eaux usées fortement acides contenant une substance toxique. Le procédé permet de retirer de façon sûre et en toute sécurité des substances toxiques comme le fluor, le bore, le cuivre, le plomb, l'arsenic, le chrome hexavalent et le cadmium des eaux usées. Le procédé permettant de traiter un liquide fortement acide (1A) contenant une substance toxique, consiste à réaliser les phases suivantes dans cet ordre : une phase d'adsorption/de précipitation (S1) dans laquelle on mélange un hydroxyapatite (11) avec le liquide fortement acide (1A) pour précipiter la substance toxique comme matière solide ; une phase de neutralisation (S2) dans laquelle on mélange une substance alcaline (12) avec le liquide acide traité (3A) contenant la matière solide précipitée pour neutraliser le liquide (3A) ; et une phase de coagulation (S3) dans laquelle on mélange le liquide traité (4A), alors neutralisé, avec un coagulant (13) pour coaguler la matière solide précipitée. La substance toxique dans le liquide fortement acide (1A) peut être fixée de manière efficace et retirée en toute sécurité. La concentration de la substance toxique dans le liquide peut être abaissée grâce au traitement. Il n'y a pas besoin de chauffer le liquide à chaque étape et le traitement peut se dérouler à température ordinaire. La substance toxique peut ainsi être traitée en toute sécurité.

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