A - Human Necessities – 62 – D
Patent
A - Human Necessities
62
D
A62D 3/02 (2007.01) A62D 3/38 (2007.01)
Patent
CA 2377599
The invention provides a process for removing and immobilising arsenic from an arsenic-containing waste. It com-prises oxidising the arsenic to pentavalent arsenic in an aqueous medium, contacting the pentavalent arsenic with trivalent iron to form an insoluble iron-arsenic compound and separating precipitated iron- arsenic compound from the aqueous medium. The oxi-dation of arsenic is effected using oxidising bacteria at a pH between 0.5 and 4 and at a temperature between 20 and 90 °C in the presence of a mineral catalyst such as pyrite.
L'invention concerne un procédé permettant d'éliminer et d'immobiliser l'arsenic provenant de déchets contenant de l'arsenic. Ledit procédé consiste à oxyder l'arsenic en arsenic pentavalent en milieu aqueux ; à mettre l'arsenic pentavalent en contact avec du fer trivalent de manière à former un composé fer-arsenic insoluble ; et à séparer le composé fer-arsenic précipité du milieu aqueux. L'arsenic est oxydé à l'aide de bactéries oxydantes à un pH compris entre 0,5 et 4 et à une température comprise entre 20 et 90 DEG C en présence d'un catalyseur minéral, tel que la pyrite.
Buisman Cees Jan Nico
Ruitenberg Renate
Mccarthy Tetrault Llp
Paques Bio Systems B.v.
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