A study on optimization of bio-solid fuel composition with sewage sludge using design of experiment (DOE)

This study was performed to reduce greenhouse gas by producing the bio solid fuel with sewage sludge as the main material. However, the sewage sludge has a high moisture content, so the energy cost of the drying process is considerable, and the calorific value is 3000 ~ 4000kcal / kg, which is low value to replace fossil fuels. In order to improve these problems and to secure competitiveness against fossil fuels, bio - solid fuel was prepared by mixing sewage sludge and biomass, and then the mixing ratio was optimized. This study suggests a method to reduce the number of experiments and to optimize the composition of bio solid fuel by using mixture design which is one of the design of experiment (DOE). As a result, the moisture content was reduced by about 20% and the calorific value of about 1000 kcal / kg could be improved.