Abstract
Dewatering tests were carried out at the Cesenatico sewage treatment plant to point out the influence of phosphorus removal on sludge characteristics, using either aluminium or ferrous sulphate. Equipment performance was studied in different conditions to determine the influence of machine operational variables. As far as centrifugation is concerned, the results showed that the most significant variables the dewatered sludge concentration depends on are the beach residence time and liquid ring height. The feed sludge concentration proved a significant variable if all the data obtained in the three phases are considered together. A pressure filtration model for the prediction of final cake concentration was set up based on the correlations of coefficients a and b of the filtrate flow curve ( φ = a· t b ) with sludge characteristics (concentration, specific resistance to filtration) and with maximum operating pressure.
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