Results (
Thai) 1:
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The long-term leaching in Figs. 4 and 5 illustrates the leaching after the initial washout of salts. With respect to depletion from the solid phase, the importance of this initial washout should be considered. Table 3 lists the solid fractions leached out in an L/S 10 batch test. It appears that only the solid contents of Ca, S and Pb were signifi- cantly affected: about 3–20% of these elements were washed out in the L/S 10 batch test. The depletion rate was less significantly affected as Ca and S were depleted only 20–100 l/kg earlier by including the washout. About 3–7% of solid Pb was within the first L/S 10 l/kg. The effect of including the initial washout as determined by the L/S 10 batch test is illustrated in Fig. 6 for Ca, S and Pb. In general, it was found that long-term leaching from the two non-carbonated residues was qualitatively similar in spite of the differences in ash composition and natural pH. Except for Ca, S and Pb, leaching in significant fractions of the solid concentrations was found to require very high L/S ratios, typically above 1000–2000 l/kg, corresponding to about 50,000–100,000 years for a typical disposal site
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