| 초록 |
Biodiesel is a renewable and carbon-neural fuel. As the production of biodiesel grows, the price of feedstock has risen continuously. Microalgae, sewage sludge and waste coffee ground are considered as alternative feedstock of biodiesel. The two-step process, lipid extraction followed by the transesterification of the lipid with methanol, was adopted in this study for biodiesel production. The lipid compositions of these feedstock were very similar. Alkali catalyst was better than acid one in the biodiesel production from waste coffee ground while acid catalyst was better for microalgae and sewage sludge. The biodiesel production from the mixture of two or three biomass was also investigated under alkali or acid catalyst. The mixing ratio of these biomass was found to influence biodiesel conversion. The sequential reaction under alkali and acid catalyst (or reverse order) resulted in an slight increase in biodiesel conversion. We finally suggested the optimal reaction condition with respect to the mixing ratio of these biomass. |
