Alternative schemes for the management of the sludge produced at Psyttalia WWTP

The paper presents the conclusions of a study sponsored by the Ministry of Environment and Public Works and conducted by a research team of the National Technical University of Athens, aiming to investigate alternative management schemes for the sludge produced and expected after the operation of the second phase of the Psyttalia Sewage Treatment Works. The alternative management schemes examined include agricultural use, co-disposal of dewatered sludge with solid wastes, co-disposal of dried sludge with solid wastes, disposal of dewatered sludge at a separate landfill, disposal of dried sludge at a separate landfill, use of dried sludge as fuel for cement or electricity production and finally incineration. On the basis of the evaluation, the production of dried sludge which can be subsequently used for agricultural purposes or as a fuel stands out as the best long term option.