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DOI: 10.5593/SGEM2016/HB33/S02.017

FATE OF ENVIRONMENTALLY RELEVANT ELEMENTS IN AN ISOLATED RIVER CATCHMENT AFFECTED BY ACID MINE DRAINAGE

D. Sporleder, A. Grawunder, G. Buechel
Friday 11 November 2016

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, SGEM Vienna GREEN Extended Scientific Sessions, www.sgemviennagreen.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-81-0 / ISSN 1314-2704, 2 - 5 November, 2016, Book 3 Vol. 3, 129-136pp, DOI: 10.5593/SGEM2016/HB33/S02.017

ABSTRACT

Even 26 years after mine closure, metal-rich water released from the underground mines still affects the environment in the former uranium mining area Ronneburg, Germany. The acid mine drainage (AMD) affected water discharged from certain scattered points within the catchment of the creek Gessenbach. In the course of remediation operations, the most influenced part of the creek was decoupled to collect the water for later water treatment.
Water analysis from this decoupled part revealed a Mg-Ca-SO42- water type combined with slightly acidic pH and high Al and heavy metal concentrations. Along the 220 m long flow path of this segment, hydrogeochemical parameters changed, resulting in precipitation of secondary Fe phases and co-precipitation of Al and heavy metals including rare earth elements (REE). Together with Fe, Ce3+ is oxidized to CeIVO2 as demonstrated by a significant change of Ce anomaly from positive to negative along the flow path.
Using Principal Component Analysis, Al, La, Ce, Nd and HCO3- are found to be within a pH depending factor.
The isolated part of Gessenbach is intensively multi contaminated and thus represents a suitable place to study interactions between hydrosphere, geosphere and biosphere. Here we present perennial water analysis of the environmentally relevant elements such as Al, Fe, Ni, U and REE.

Keywords: Rare Earth Element fractionation, Fe precipitation, Principal Component Analysis, Ce Anomaly

PAPER DOI: 10.5593/SGEM2016/HB33/S02.017, FATE OF ENVIRONMENTALLY RELEVANT ELEMENTS IN AN ISOLATED RIVER CATCHMENT AFFECTED BY ACID MINE DRAINAGE

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