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