Design, construction and operation of 100 kg/hr pilot scale pyrolysis and smelting system have been made with objective of studying the possibility of commercialization. It has been known that solid wastes that have the calorific value more than 3,000 kcal/kg can be easily smelted and vitrified in this system. The leaching concentrations of considered heavy metals of smelted and vitrified slags are less than 10% of the upper limit of Korean environmental standard. Analyzed concentrations of dioxin in exhaust gas are 5.7 ng-Teq/Nm³ for polymeric wastes, and 11.7 ng-Teq/Nm³ for municipal wastes, respectively . These results may show that there exists a bound of reducing the residual concentration of dioxin by using only the high temperature smelting in this small pilot scale system. Nevertheless, the hazardous fly ash and bottom ash can be converted to usable raw materials by the thermal treatment of pyrolysis and smelting.