The environmental impact of traditional waste management practice has become a central concern in industrialized countries. The past decades have seen a dramatic development in the technology for reducing air pollution caused by incineration as stipulated by clean air policies in industrialized countries. Toxic and/or valuable and rare elements are still dispersed into the environment under current practice for the disposal of treated or untreated waste materials. This book results from the discussion among scientists, engineers and authorities; and hopes to contribute towards the implementation of future sustainable waste management practices.