| 초록 |
In order to reduce biodiesel production cost as well as to recycle wastes, waste coffee grounds (WCGs) were used as a feedstock for biodiesel. WCGs was found to have 16.4% of lipid content with 2.0% of free fatty acids. Lipid extraction from the WCGs and biodiesel production using the lipids were statistically investigated. For lipid extraction, solvent volume showed significant influence on the lipid extraction while time slightly and temperature barely influenced on that. More than 98% of lipid extraction efficiency was achieved at 15 mL-hexane/g-WCGs, 1 hr of extraction time and 25℃. For biodiesel production, time and catalyst amount were significant factors for acid (H2SO4) catalyst while time is the only significant factor for alkali catalyst (NaOH) in the experimental range. Alkali catalyst required less amounts of catalyst and methanol and shorter reaction time than acid catalyst, and achieved 85% and 90% of biodiesel conversion at 40 and 60 ℃, respectively. |
