Leachability of Major and Trace Elements of Fly Ash from Ptolemais Power Station, Northern Greece

11 páginas, 3 figuras, 2 tablas.Major (Si, Al, Fe, Ti, Ca, Mg, Na, K, and S) and trace (Ag, As, B, Ba, Be, Bi, Br, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Ga, Gd, Ge, Hf, Ho I, La, Li, Lu, Mn, Mo, Nb, Nd, Ni, Pb, Pr, Rb, Sb, Sc, Se, Sm, Sn, Sr, Ta, Tb, Th, Tl, Tm, U V, W, Y, Yb Zn, and Zr) elements were determined in experimental leachates of fly ash from the Ptolemais coal-fired power plant (Northern Greece). This plant has a total capacity of 620 MW and consumes lignite from the Ptolemais basin. Experimental leaching was carried out using one stage and column leaching procedures. These leaching experiments allowed for the characterization of the relative mass leached and the element behavior in function of time. Relative mass leached is generally low. Only Sr and Mo are lost during the first five pore volumes of the leaching. The foremost transformations are relatively fast, implying mainly Ca and S reactions and an important lowering of pH values. The results can be used in the disposal assessment of this combustion byproduct to model more accurately the behavior of major and trace elements released during fly ash landfilling.This work was funded through the Greek-Spanish Bilateral Agreement for Scienti fic Research, which is gratefully acknowledged.Peer reviewe

Environmentally Important Elements in Fly Ashes and Their Leachates of the Power Stations of Greece

9 páginas, 4 tablas.The relative mass of major and trace elements that potentially can be released from the fly ashes generated in the main Greek power plants (Megalopolis A, Amynteon, Agios Dimitrios, Ptolemais, and Kardia) when they are landfilled and exposed to water have been determined. These fly ashes were subject to a one-stage leaching procedure using the Synthetic Groundwater Leaching Procedure (SGLP) test to simulate this situation. The elements Si, Al, Fe, Ti, Ca, Mg, Na, K, S, Ag, As, B, Ba, Be, Bi, Br, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Ga, Gd, Ge, Hf, Ho, I, La, Li, Lu, Mn, Mo, Nb, Nd, Ni, Pb, Pr, Rb, Sb, Sc, Se, Sm, Sn, Sr, Ta, Tb, Th, Tl, Tm, U, V, W, Y, Yb, Zn, and Zr have been studied. Results show that the elements with the highest potential hazard for the environment are S, Ca, Br, I, Mo, and Sr. The elements with a moderate mobility are K, Na, Ti, B, Ba, Cd, Cr, Cs, Li, Rb, Sb, Se, Sn, W, and Zn. Si, Al, Fe, Mg, Ag, As, Be, Bi, Ce, Co, Cu, Dy, Er, Eu, Ga, Gd, Ge, Hf, Ho, La, Lu, Mn, Nb, Nd, Ni, Pb, Pr, Sc, Sm, Ta, Tb, Th, Tl, Tm, U, V, Y, Yb, and Zr have a low mobility and, consequently, a low potential hazard for the environment.This work was funded through the Greek-Spanish Bilateral Agreement for Scienti c Research, which is gratefully acknowledged.Peer reviewe

The Drama basin water: quality and peat/lignite interaction

7 páginas, 3 figuras, 2 tablas.The Drama basin is a typical intermontane basin (2,300 km2) in northern Greece filled with detrital and lacustrine sediments containing peat/lignite seams. In the southwestern part of the basin (Philippi sub-basin) peat accumulated practically until the present. Specific conductivity and pH, as well as contents of major ions and trace elements have been determined in 20 surface and shallow groundwater samples collected across the basin. Water composition reflects the dominance of carbonate rocks in the whole basin. Peat oxidation and mineralization contribute to poor element enrichment of the Philippi sub-basin surface water derived from both the organic and inorganic peat fractions. Anthropogenic activities (waste water effluents and rubbish dumps) increase Mn, P, B, and Br concentrations. Only Mn exceeds EC recommendations (50 µg/l) in some places. There is also a slight increase in Na+ and Cl- contents. Improving measures in the management of point pollution sources should be a priority to warrant the sustainable exploitation of water resources in the Drama basin.This work was funded through the Greek-Spanish Bilateral Agreement for Scientific Research.Peer reviewe