The influence of temperature and steam on the yields of tar and light hydrocarbon compounds during devolatilization of dried sewage sludge in a fluidized bed

► Devolatilization tests were conducted between 600 °C and 900 °C. ► Detailed analysis of tars and light hydrocarbons was performed. ► Steam concentration (0-30 vol%) hardly influences tar and hydrocarbon yields. ► Stoichiometric formula of tar was estimated by elemental analysis of tar. ► Correlations between tar and light hydrocarbon yields were obtained.