In Germany there were about 5.2 million tonnes of ashes/slags from waste-to-energy (wte) plants in 2009. Predominantly the ashes will be recycled for road construction, landfill construction or underground backfilling. The recovery of metals from the ashes and the substitution of natural resources make a substantial contribution to the protection of climate and conservation of natural resources.A qualified assumption of produced ashes from waste-to-energy plants and a characterization of the ashes regarding composition and usability will be presented as well as quality requirements for recycling. Based on state of the art ash treatment, the technical opportunities for a further treatment to improve the separation of ferrous and non-ferrous metals will be discussed.
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