Production of biodiesel from Jatropha curcas mixed with waste cooking oil assisted by ultrasound

Jatropha curcas oil has a high amount of free fatty acid, while waste cooking oil has a low amount of free fatty acid content. The purpose of this study was to investigate the production of biodiesel from a mixture of Jatropha curcas and waste cooking. The highest biodiesel yields from the mixture of Jatropha curcas and waste cooking was obtained at 99.3%. The result shows that the physicochemical properties of mixed Jatropha curcas and waste cooking oil methyl ester met the standard requirements laid in ASTM D6751 and EN 14214.