DBPapers
DOI:10.5593/SGEM2013/BE5.V1/S20.005

ANALYSIS OF HEAVY METAL CONTENT TO EVALUATE LEACHING CHARACTERISTICS OF COAL ASH WASTES

L. G. Popescu, M. Cruceru, G. Predeanu, E. Volceanov, A. Tr. Abagiu, M. Bălănescu, R. Popa, E. C. Schiopu
Tuesday 6 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Ecology, Economics, Education And Legislation, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-619-7105-04-9 / ISSN 1314-2704, June 16-22, 2013, Vol. 1, 33 - 40 pp

ABSTRACT

The present study represents a preliminary investigation of the heavy metal content and leaching characteristics of ash and slag stored in Ceplea Valley dumps belonging to Turceni power plant, located in the South-Western side of Romania.
The ashes were analyzed for the presence of As, Cu, Pb, Zn, Ni, Cr, Mn, Co, V, Mo, Ba, Cd, Hg. Major, minor and trace element concentrations in solid samples were determined. For minor elements (under 100 ppm) found in the ash and slag leachate, it was used Inductively Coupled Plasma Mass Spectrometry and for mercury determination the Atomic Absorption Spectrometry Cold Vapours. Beside the assessment of heavy metals in leachate, were determined total dissolved substances, fluorine, chlorine, sulphates. An important indicator for the analysis of the leaching test determined was “% leaching”.
The results reveal that for the investigated samples the heavy metals with high values of “% leaching” is Mo (between 5.6 and 8.3 %), followed by Hg (between 1.8 and 3.2 %), Cu (between 1.7 and 1.9 %) and Se (between 1.7 and 2.9 %). For other heavy metals the % of leaching values are below the standard limit of 1. Also, all the values for the pH, TDS, F-, Cl- and SO42- are below the leaching limits allowed in RMO 2005/95, for all the investigated ash and slag samples.

Keywords: ash, slag, heavy metal, leaching characteristics