Because MSW Incinerator fly ash have a lot of heavy metals, that is needed to treat by stabilizedtreatment. Large-scale Lysimeters were used to study many materials; two types of chemically treated fly ash, untreated fly ash and molten slag. We continued to research this experiment for about 5 years. On this report, Water quality characteristics of leachate from lysimeters were described. Leachate volume of each lysimeter had large difference, because of permeability and water-holding capacity. Because treated fly ash has much alkaline substance, pH value of leachate was high at early period. Most of leachate from mono filling lysimeters had high concentration lead (Pb) at theearly period.
