Immobilization of inorganic arsenic species using iron

Details Immobilization of inorganic arsenic species using iron Immobilization of inorganic arsenic species using iron

C - Chemistry, Metallurgy

02

F

C02F 1/52 (2006.01) B09C 1/00 (2006.01) C02F 1/70 (2006.01)

Patent

CA 2293656

A method for the remediation of arsenic is presented, comprising providing an aqueous solution of inorganic arsenic species, and passing the solution of inorganic arsenic species over a substrate comprising a zero valent metal under anaerobic conditions, thereby reducing the arsenic species and forming arsenic-metal coprecipitates. Preferably, the metal is iron in the form of iron filings, and a source of sulfate ions is also present, resulting in the precipitation of arseno-pyrites.

L'invention porte sur un procédé d'élimination de l'arsenic consistant à, partant d'une solution aqueuse de composés arsenicaux inorganiques, à la faire passer sur un substrat d'un métal à valence zéro dans des conditions anaréobies, ce qui réduit les composés arsenicaux et forme des co-précipités arséno-métalliques. Le métal utilisé est de préférence du fer sous forme de limaille. On opère également en présence d'une source d'ions sulfate prévenant de la précipitation des arséno-pyrites.

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