Abstract
Bio-oil is a renewable and transportable liquid fuel produced by the fast pyrolysis of biomass resources, and it can be used as a fuel for direct combustion with natural gasses and heavy oils. When sewage sludge is utilized as an input material into the bio-oil production, to acquire a sufficient heat source needed in drying the dewatered sludge is essential point for achieving more efficient production system. In this paper, we developed the high-efficient bio-oil production system of sewage sludge utilizing power generated from exhaust heat at incineration plants in Wakayama City, Wakayama Prefecture. We also evaluated the reduction effects in energy consumption and GHG emission based on 4 alternative treatment systems of general waste and sewage sludge. The results of analysis showed that the bio-oil production system of the sewage sludge utilizing exhaust heat at incineration plant would have potential for energy independence. We also found this system could reduce GHG emission by 37.3%, compared with a traditional system in which the waste power generation was not installed at incineration plant and simple incineration technology was applied to sewerage treatment process.
