Torrefaction is a treatment which serves to improve the properties of biomass in relation to thermochemical processing techniques for energy generation. In this study, the torrefaction of sewage sludge, which is a non-lignocellulosic waste was investigated in a horizontal tubular reactor under nitrogen flow at temperature ranging from 150-600℃. The torrefied sewage sludge products were characterized in terms of their energy yield, ash content and volatile fraction. The energy and mass yields decreased with an increase in the torrefaction temperature. The pelletization and the combustion characteristics of the torrefied sewage sludge was studied in isothermal and non-isothermal conditions.