Process for the treatment of contaminated material

Details Process for the treatment of contaminated material Process for the treatment of contaminated material

A - Human Necessities

62

D

A62D 3/02 (2007.01) B01D 15/00 (2006.01) B09C 1/02 (2006.01) B09C 1/10 (2006.01) C02F 3/34 (2006.01) C02F 11/00 (2006.01) C22B 3/00 (2006.01) C22B 3/18 (2006.01)

Patent

CA 2183585

A process for the decontamination of a medium comprising a particulate material contaminated with one or more metal species, the process comprising the steps of treating a body of the said medium with microbially produced sulphuric acid so as to solubilise themetal species as a metal sulphate; treating the leached metal sulphate by a bioprecipitation process which converts the said sulphate to an insoluble sulphide; separating hydrogen sulphide produced during the bioprecipitation from the insoluble metal sulphide; and oxidising the separated hydrogen sulphide to form a reusable source of a sulphur-containing ingredient.

Ce procédé de décontamination d'un milieu composé d'un matériau particulaire contaminé par une ou plusieurs espèces métalliques, comprend les étapes consistant à traiter le corps dudit milieu à l'aide d'acide sulfurique produit par voie microbienne, de façon à dissoudre l'espèce métallique sous forme de sulfate de métal, à traiter le sulfate de métal lessivé à l'aide d'un procédé de précipitation biologique qui transforme ce sulfate en sulfure insoluble, à séparer le sulfure d'hydrogène produit lors de cette précipitation du sulfure métallique insoluble, puis à oxyder ce sulfure d'hydrogène afin de former une source réutilisable d'un ingrédient contenant du soufre.

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