ENERGY APPRAISAL OF THE COMBINED SYSTEM WITH THE INCINERATOR USING THE DRY TYPE METHANE FERMENTATION

Abstract

 Because solid residue and digestate liquid should be treated or disposed when food wastes are anaerobically digestated, combined system in which these waste are treated in incineration facility considered better strategy. In this study, two scenarios of combined system with dry type anaerobic digestion and incineration were evaluated for net recovery of electricity; power generation by gas turbine and biogas use in a super heater for generated steam in an incinerator. For both scenarios, two cases of input waste in anaerobic digestion were supposed: food waste only and food waste plus mixed paper. Sensitivity analysis of main parameters of the system was performed to find a way to improve performance. Energy recovery of combined system is higher than that incineration system in which food waste is burned, however, it is only caused by the increased power generation efficiency in incineration. For this reason, separation of paper waste increase biogas generation, but total recovery of energy is reduced.