Dépôt numérique
RECHERCHER

RDX degradation by chemical oxidation using calcium peroxide in bench scale sludge systems.

Téléchargements

Téléchargements par mois depuis la dernière année

Plus de statistiques...

Lapointe, Marie-Claude; Martel, Richard; Cassidy, Daniel Patrick (2020). RDX degradation by chemical oxidation using calcium peroxide in bench scale sludge systems. Environmental Research , vol. 188 . p. 109836. DOI: 10.1016/j.envres.2020.109836.

[img] PDF
Document sous embargo jusqu'à 25 juin 2022.
Disponible sous licence Creative Commons Attribution Non-commercial No Derivatives.

Télécharger (7MB)

Résumé

The ability of calcium peroxide (CaO₂) to degrade hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) in contaminated soil slurries using CaO₂-based modified Fenton oxidation was investigated. Results showed that increasing the CaO₂ dose increased degradation rates of RDX and pH. RDX concentrations decreased to below detection after 18 h with 2 M and 2.5 M CaO₂, after 30 h with 1.5 M CaO₂, after 54 h with 1 M CaO₂, but 0.1 M CaO₂ achieved no significant RDX removal. Increasing the soil organic matter content decreased the rate and extent of RDX degradation. RDX degradation products 4-nitro-2,4-diazabutanal (NDAB) and methylenedinitramine (MEDINA) were quantified, and the greater accumulation of NDAB than MEDINA suggests denitration of RDX was the most likely initial degradation step. Isotopic ratios for nitrogen and oxygen associated with RDX oxidation are also consistent with either nitrification of NH₄⁺ from soil or precipitation. Existing technologies merely only extract energetics from soils for treatment ex situ, whereas the approach introduced herein destroys RDX in situ with a one-step application.

Type de document: Article
Mots-clés libres: RDX degradation; calcium peroxide; chemical oxidation; energetics-contaminated soil; isotopes
Centre: Centre Eau Terre Environnement
Date de dépôt: 24 juill. 2020 13:21
Dernière modification: 24 juill. 2020 13:21
URI: http://espace.inrs.ca/id/eprint/10351

Actions (Identification requise)

Modifier la notice Modifier la notice