Cesium removal from contaminated sand by supercritical CO2 extraction

Abstract : Supercritical CO2 extraction is a promising process among existing decontamination methods. Feasibility of supercritical CO2 extraction processing for decontamination of contaminated soils has been studied with non-radioactive cesium as contaminant. Extractant system considered was a mixture of DB18C6 crown ether and HPFOA that gave a synergistic effect when combined. Process parameters influence such as operating pressure (25–29 MPa) and temperature (40–80 °C), initial cesium/extractant/cationic exchanger amounts (molar ratio between 1/12/12 and 1/100/100) and soil moisture (0–6%wt) has been tested. Low temperature (40 °C) and high pressure (29 MPa) allow to optimize process ability for cesium removal. A compromise should be established, for a fixed CO2 flow rate, between amounts of extractants and cationic exchangers. Efficiency of cesium removal seems to be optimized at 3%wt matrix moisture. Extraction from sand is successful with yields up to 95%.
Type de document :
Article dans une revue
Journal of Environmental Chemical Engineering, Elsevier, 2016, 4 (1), pp.1076-1080. 〈10.1016/j.jece.2016.01.009〉
Liste complète des métadonnées

https://hal.archives-ouvertes.fr/hal-01300394
Contributeur : Eddy Constant <>
Soumis le : dimanche 10 avril 2016 - 21:07:24
Dernière modification le : jeudi 18 janvier 2018 - 02:01:15

Identifiants

Collections

Citation

Antoine Leybros, Agnès Grandjean, Nathalie Segond, Marc Messalier, Olivier Boutin. Cesium removal from contaminated sand by supercritical CO2 extraction. Journal of Environmental Chemical Engineering, Elsevier, 2016, 4 (1), pp.1076-1080. 〈10.1016/j.jece.2016.01.009〉. 〈hal-01300394〉

Partager

Métriques

Consultations de la notice

149