Politecnico di Torino - Laurea Magistrale in Ingegneria per l’Ambiente e il Territorio Assessment of the effect of digestion technology on the dewaterability of waste activated sludge Relatore: Prof.ssa Silvia Fiore??????????????Candidata: Chiara Marchi Co-relatore: Prof Pavel Jenicek, VSCHT University of Prague Over 11 M tons of waste activated sludge (WAS) are produced every year by wastewater treatment plants in Europe, often with a dry substance content below 20-25 % w/w. It is crucial to find the best solution to treat WAS in order to reduce its amount, and thus the disposal costs, and to explore reuse perspectives that could imply the lowest possible costs and environmental impacts.