Effect of Ultrasonic Pretreatment on Biomethane Potential of Two-Phase Olive Mill Solid Waste: Kinetic Approach and Process Performance

Table 4

Hemicellulose, cellulose, and lignin contents for the untreated two-phase OMSW and ultrasound pretreated OMSW at 20, 90, and 180 min.

Times	Hemicellulose	Cellulose	Lignin
(min)	(%)	(%)	(%)
Untreated OMSW	9.0 ± 0.2	4.2 ± 0.1	15.8 ± 0.4
20	10.9 ± 0.3	10.5 ± 0.5	14.4 ± 0.6
90	11.8 ± 0.0	11.6 ± 0.6	14.6 ± 0.1
180	11.6 ± 2.6	11.0 ± 1.2	14.5 ± 1.3