ON THE EFFECT OF SOPHOROLIPIDS ON DIFFERENT FRACTIONS OF MINE TAILING AND THE SPECIATION OF ARSENIC
Fereshteh Arab, Catherine Mulligan
In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost ConferenceSession: Contamined Sites and Remediation / Sités contaminés et réhabilitation
ABSTRACT: Mine tailings produced after extracting gold from its ore, contain high levels of arsenic and heavy metals. As a result, mine tailings are one of the main environmental contamination sources. The objective of the present study was to investigate the effects of sophorolipids on the speciation and mobilization of arsenic, as well, on the morphology and composition of the mine tailings. The result from the sequential extraction of untreated and treated sample showed that in a continuous setting, a solution of 1% sophorolipids at pH 5 was able to change the morphology of the sample and mobilize arsenic associated with all fractions of the mine tailing sample. By using the soil washing in the continuous setup the total removal of 99% of iron and 98.8 % of arsenic was achieved. The results drawn from these investigations will be used to develop an efficient, environmentally friendly, and economically feasible system for the treatment of mine tailings.
RÉSUMÉ: Les résidus miniers produits après l™extraction de l™or de son minerai, contiennent de hauts niveaux d™arsenic et de métaux lourds. En conséquence, les résidus miniers sont l™une des sources principales de pollution de l™environnement. L™objectif de la présente étude était d™étudier les effets des sophorolipides sur la spéciation et la mobilisation de l™arsenic, ainsi que sur la morphologie et la composition des résidus miniers. Le résultat de l™extraction séquentielle des échantillons traités et non-traités a montré que dans un test continu, une solution contenant 1% de sophorolipides à un pH de 5 peut changer la morphologie de l™échantillon et mobiliser l™arsenic associé à toutes les fractions de résidus miniers de l™échantillon. En utilisant le lavage dans la configuration continue, 99% du fer et 98,8% de l™arsenic ont été enlevés. Les résultats tirés de cette investigation seront donc utilisés pour développer un système efficace, respectueux de l™environnement et économiquement viable pour le traitement des résidus miniers.
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Fereshteh Arab; Catherine Mulligan (2015) ON THE EFFECT OF SOPHOROLIPIDS ON DIFFERENT FRACTIONS OF MINE TAILING AND THE SPECIATION OF ARSENIC in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.
@article{265,author = Fereshteh Arab; Catherine Mulligan,title = ON THE EFFECT OF SOPHOROLIPIDS ON DIFFERENT FRACTIONS OF MINE TAILING AND THE SPECIATION OF ARSENIC,year = 2015}