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Conveyors which transport the individual clinker fractions coarse, medium and fine at the waste incineration plant KEZO Kehrichtverwertung Zuercher Oberland in Hinwil, Canton of Zurich, Switzerland, on March 16, 2017. This waste incineration plant is one of two, the other one being the waste incineration plant KEBAG AG in Zuchwil, Canton of Solothurn, Switzerland, operated by ZAR, the center for sustainable management of recyclable waste and resources, which develops recycling methods for combustion residues such as clinker, filter ash and sewage sludge ash. (KEYSTONE/Gaetan Bally)