Sludge stabilization represents one of the most crucial aspects in sludge management. Anaerobic digestion is generally the most widespread method for sludge stabilization in large wastewater treatment plants, mainly because of the high energy recovery obtained by the biogas production. However, the digested sludge produced must be often treated with the aim of quality improvement. Several studies have highlighted the advantages of a post – aerobic stage following the conventional anaerobic digestion to improve the sludge properties. In this study, a post – aeration treatment of anaerobically digested sludge is proposed. This stage could successfully reduce TAN and organic compounds concentration, and improve the dewaterability properties.