CASE STORY Sewage Sludge Incineration Plant, Zürich WWTP Werdhölzli in Switzerland is the largest and most technologically advanced plant in Switzerland. Within the last five years biological treatment and filtration systems were replaced and since 2015 a new sludge predrying and incineration plant was commissioned and started to operate. Annually around 100,000 tonnes of dewatered sewage sludge is processed in the Zurich region, w

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