Process for the treatment of waste water containing heavy...

C - Chemistry – Metallurgy – 02 – F

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C02F 3/34 (2006.01) C02F 3/28 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2354388

A process for the treatment of waste water containing heavy metals is disclosed in which sulphur components and/or metals are biologically reduced to precipitate the metals as water-insoluble metal species, which are separated from the waste water. The biological reduction and the precipitation of the metal species are carried out in a moving sand bed, in which sand particles partly immobilise the bacteria and retain the precipitated metal species, treated waste water is separated from the precipitated metal species, and the precipitated metal species are subsequently separated from the sand particles. Metals like selenium and uranium can be precipitated without sulphur components, whereas metals like antimony, cadmium, copper, zinc and the like are precipitated as sulphides.

L'invention concerne un procédé de traitement des eaux usées qui contiennent des métaux lourds selon lequel les composants de soufre et/ou les métaux sont biologiquement réduits de façon à précipiter les métaux sous forme d'espèces métalliques hydro-insolubles, métaux qu'on sépare ensuite des eaux usées. On procède à la réduction biologique et à la précipitation des espèces métalliques dans un lit de sable en mouvement, dans lequel les particules de sable immobilisent en partie les bactéries et confinent les espèces métalliques précipitées. Les eaux usées traitées sont séparées des espèces métalliques précipitées, et ces dernières sont ensuite séparées des particules de sable. Des métaux, tels que le sélénium et l'uranium sont précipités sans composants de soufre, alors que les métaux, tels que l'antimoine, le cadmium, le cuivre, le zinc et analogues, sont précipités sous forme de sulfures.

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