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Biomasses such as woody waste and sewage sludge can be converted to renewable energy source by using carbonization process. Carbonization process is carried out to obtain energy characteristics of carbonization residue from the mixture of woody waste and sewage sludge. The effects of temperature, time, and sewage sludge content on carbonization process are estimated by energy characteristics of the residue such as heating, yield, and fuel ratio. From the results of energy characteristics of residue, the optimum content of sewage sludge in carbonization process can be decided by 30%. At the optimum content of sewage sludge in carbonization process, the carbonization residue of mixture of woody waste and sewage sludge can be deserved to use one of renewable energy sources from the results of fuel ratio and total heating value.

This study aims to identify the feasibility to use food waste as fuel by torrefaction of food waste and comparing the influence upon the characteristics of torrefied products and temperature, heat carrier. According to the experiment result with reaction temperature 180℃~270℃ in nitrogen gas heat carrier and oil media heat carrier, the lower is the reaction temperature, water reduction was more effective by oil media heat carrier. But it was confirmed that, as the temperature is heightened, the difference was minimal. The caloric value rose from initial 660kcal/kg to 6,800Kcal/kg. As reaction temperature is heightened, Van krevelen Diagram moved to the range of Lignite range. It was confirmed that food waste can be converted to solid fuel through torrefaction reaction, and the higher is the reaction temperature, the closer to the low grade coal.