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LEACHABILITY OF ENVIRONMENTALLY HAZARDOUS ELEMENTS FROM ASHES PRODUCED AFTER LIGNITE COMBUSTION IN AGIOS DIMITRIOS POWER PLANT, NORTHERN GREECE

AUTHOR/S: PAPASTERGIOS, G., GEORGAKOPOULOS, A., FERNÁNDEZ-TURIEL J., GIMENO D.
Sunday 1 August 2010 by Libadmin2005

5th International Scientific Conference - SGEM2005, www.sgem.org, SGEM2005 Conference Proceedings/ ISBN: 954-918181-2, June 13-17, 2005, 292- 306pp

ABSTRACT

A bottom ash and a fly ash sample from Unit 1 of the Agios Dimitrios Power Plant,
Northern Greece, were subjected to a one stage leaching procedure (Synthetic Groundwater
Leaching Procedure – SGLP). The lignite burned in it derives from the Southern Field Mine
from the Lignite Centre of Western Macedonia. The Relative Mass Leached (RML) for ten
major (Al, P, Ca, Mg, K, Fe, Na, Si, S and Ti) and forty eight trace elements (Li, Be, B, V, Cr,
Mn, Co, Ni, Cu, Zn, Ga, Ge, As, Se, Rb, Sr, Y, Zr, Nb, Mo, Ag, Cd, Sn, Sb, Te, Cs, Ba, La, Ce,
Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Hf, Ta, W, Pb, Bi, Th, and U) were
determined by use of ICP-OES and ICP-MS. Calcium is the most abundant element in both
ashes, as well as in their respective leachates, related to the high calcium minerals content of
the bottom ash and fly ash. The results indicate that the majority of the elements show a very
low to moderate mobility. The only elements that could be mentioned as exceptions are S and
Sr. Sulphur has RML values that are greater than 70% for both leachates, while Sr is totally
released in the fly ash leachate. Consequently, the great majority of the elements represent a
low to moderate potential hazard to the environment.