Asbestos-Containing Waste Treatment by High Temperature Melting

Osada, M.; Takamiya, K.; Manako, K.; Sakai, S. (2008) Proceedings of the 5th International Conference on Combustion, Incineration/ Pyrolysis and Emission Control, pp. 519-524

Asbestos-containing wastes such as building materials are predicted to be generated in the scale of more than 1 million tons per year in Japan. Yet, the capacity of landfill sites has been decreasing year by year and alternative treatment methods should be established as soon as possible. The shaft-type gasification and melting furnace is expected to be one of the promising methods because this furnace involves a high temperature melting process and can treat not only combustible waste but also incombustible waste. This paper contains the test operation results in order to confirm the effectiveness of high temperature melting treatment by using shaft-type gasification and melting furnace for the detoxification of asbestos-containing waste. The authorsexecuted a verification test using a commercial plant based on the results of a preliminary test using a 10t/day-scale pilot plant. The results of the verification test show the good performance of the melting treatment of asbestos-containing waste with the general waste at a high temperature of 1500 degrees centigrade. The by-products of the melting process such as slag, metal and fly ash were analyzed and their concentrations of asbestos were confirmed to be under the lower limit of analysis. The asbestos concentration of the flue gas from the melting furnace was also investigated and confirmed to be under the lower limit of analysis. These results proved the practicability of asbestos-containing waste treatment using a commercial plant with a gasification and melting furnace without causing environmental pollution. Moreover, in this test, the formed insulator containing asbestos was well detoxified as well as the slate


Asbestos; High temperature melting; Gasification and melting furnace; Slate; Formed insulator