Response surface optimization of biodiesel yield from pre-treated waste oil of rendered pork from a food processing industry

Bioresources and Bioprocessing

Table 2 Characteristics of waste oil of rendered pork

Property	Unit	WO-RP	Animal fat
Moisture content	%	0.14	0.13
Acid value	mg KOH/g	8.55^a, 9.74^b	14.57
Free fatty acid (FFA)	%	4.30^a, 4.90^b	4.90
Density @room temperature	g/cm³	0.897	0.916