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

Table 2

Experimental conditions of specific energies and ultrasound densities applied to the two-phase OMSW used in the experiments (80% w/w).

Time	Wet sample	Specific energy	Ultrasound density
(min)	(g)	(kJ/kgTS)	(W/kg wet sample)
20	99.6	11367	2008.2
40	107.2	21121	1865.8
60	99.7	34072	2006.6
90	99.3	51284	2013.5
120	99.1	68557	2018.8
180	96.1	106003	2080.9