Improvement of Biogas Production from Orange Peel Waste by Leaching of Limonene

Table 2

Hexane residue in pretreated orange peel waste after evaporation in different conditions.

Pretreated peel waste	Evaporation temp. (°C)	Evaporation Time (min)	Hexane concentration (ml/g orange peel waste)	% hexane removal
Unevaporated (control)	—	—	0.12 ± 0.00	—
Evaporated	30	10	0.12 ± 0.01	0
Evaporated	30	30	0.06 ± 0.03	54
Evaporated	50	10	0.04 ± 0.00	66
Evaporated	50	30	0.07 ± 0.00	45
Evaporated	70	10	0.08 ± 0.02	31
Evaporated	70	30	0.09 ± 0.01	28