Effects of Sprinkling Water and Aeration Treatments on the Elution Characteristics of MSWI Bottom Ash

The physical and chemical characteristics of MSWI bottom ashes from four different areas were investi-gated. The effects of sprinkling water and aeration on the elution characteristics of bottom ash were also researched. Treatments using the same liquid-solid ratio for two differing periods (1 day or about 50 days) were set up to study the effects of hydraulic intensity and ventilation volume. The quantities of Na and TOC eluted by the water-sprinkling treatment (L/S = 0 . 5-0 . 6) were found to be about the same as for mechanical washing (L/S = 10) if the intensity of the water sprinkling was optimized for each ash type. The results sug-gested that aeration for 50 days accelerated elution of Cl and inhibited elution of TOC. The elution of Cl was particularly affected by the initial chemical and mineral composition. This research also showed that aeration was more effective at inhibiting the elution of Pb and Ca than washing out by sprinkling water.