A reduction in jatropha oil acidity proportional to the increase in concentration of the swine wastewater applied to the crop was observed.
The higher volumes of swine wastewater applied favored the reduction in the concentration of linoleic acids in jatropha oil, what was likely responsible for the acidity reduction, once that the lower ercentage of linoleic acid provides more stability and oxidation and, consequently, less free fatty acid quantity in the oil.