In-situ generation of oxygen-releasing metal peroxides

B - Operations – Transporting – 09 – C

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B09C 1/08 (2006.01) B09C 1/10 (2006.01)

Patent

CA 2484644

A method is provided for the remediation of contaminants in soil and groundwater. Via the injection of an aqueous energetic oxidant solution containing free radicals, oxidative conditions can be created within or ahead of a contaminant plume. Some contaminants may be remediated directly by reaction with the free radicals. Additionally and more importantly, the free radicals create an oxidative condition whereby native or injected materials, especially metals, are converted to peroxides. These peroxides provide a long- term oxygen reservoir, releasing oxygen relatively slowly over time. The oxygen can enhance microbial metabolism to remediate contaminants, can react with contaminant metals either to form immobile precipitants or to mobilize other metals to permit remediation through leaching techniques. Various injection strategies for injecting the energetic oxidant solution are also disclosed.

L'invention concerne un procédé d'élimination de contaminants du sol et des eaux souterraines. L'injection d'une solution d'oxydant énergétique aqueux contenant des radicaux libres permet de créer des conditions d'oxydation dans un panache de contamination ou en amont de ce celui-ci. Certains contaminants peuvent être éliminés directement par d'une réaction avec les radicaux libres. De plus, les radicaux libres créent une condition d'oxydation dans laquelle des matériaux natifs ou injectés, en particulier des métaux, sont convertis en peroxydes. Lesdits peroxydes forment un réservoir d'oxygène à long terme, libérant l'oxygène relativement lentement sur la durée. L'oxygène peut renforcer le métabolisme microbien pour éliminer les contaminants, et peut réagir avec les métaux contaminants, soit pour former des précipitants immobiles, soit pour mobiliser d'autres métaux de sorte à permettre l'élimination par la mise en oeuvre de techniques de lixiviation. L'invention concerne également diverses méthodes d'injection permettant d'injecter ladite solution d'oxydant énergétique.

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