A process for treating arsenic-containing waste water

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/62 (2006.01) C02F 1/52 (2006.01) C02F 1/72 (2006.01) C02F 1/76 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2193557

The present invention provides a process for treating arsenic-containing waste water, comprising adding an oxidizing agent, if necessary, to arsenic-containing waste water to oxidize trivalent arsenic in the waste water into pentavalent arsenic; adding a calcium compound to adjust the pH to 12 or higher; separating it into solid and liquid (first solid/liquid separation); calcining the resulting sludge, while adding a ferric salt to the treated solution to adjust the pH to 6-9 after the solid/liquid separation; and separating it into solid and liquid (second solid/liquid separation). According to the present invention, it is possible to remove arsenic from waste water efficiently to yield treated water satisfying various tolerance limits under various regulations, while the arsenic-containing sludge separated from the waste water can become harmless in subsequent continuous steps.

La présente invention offre un procédé de traitement des eaux usées contenant de l'arsenic. Ce procédé comprend : l'ajout d'un oxydant, au besoin, à l'eau usée contenant de l'arsenic afin d'oxyder l'arsenic trivalent qu'elle contient pour en faire de l'arsenic pentavalent; l'ajout d'un composé de calcium pour amener le pH à 12 ou à un niveau plus élevé; une première séparation de l'eau usée en solide et en liquide; la calcination de la boue résultante, avec ajout d'un sel ferrique à la solution traitée pour amener le pH entre 6 et 9 après la séparation solide/liquide; et une deuxième séparation de l'eau en solide et en liquide. La présente invention permet d'enlever efficacement l'arsenic de l'eau usée de façon à obtenir une eau traitée satisfaisant à diverses limites de tolérance en vertu de divers règlements, la boue arsénifère séparée de l'eau usée pouvant devenir sans danger dans la suite des opérations.

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