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

Table 1

Main characteristics and composition of the two-phase OMSW used in the experiments.

Parameters	Values
TS (g/kg)	265 ± 3
VS (g/kg)	228 ± 2
CODt (g O2/kg)	331 ± 1
CODs (g O2/kg)	143 ± 3
Ph	4.9 ± 0.2
TA (g CaCO3/kg)	2.5 ± 0.1
AN (g ammoniacal N/kg)	0.3 ± 0.0
TKN (g Kjeldahl N/Kg)	3.6 ± 0.1
Hemicellulose (%)	11.3 ± 0.2
Cellulose (%)	5.2 ± 0.1
Lignin (%)	19.7 ± 0.4
Fat (%)	3.8 ± 0.3

TS: total solids; VS: volatile solids; CODt: total chemical oxygen demand; CODs: soluble chemical oxygen demand; TKN: total Kjeldahl nitrogen; AN: ammoniacal nitrogen; TA: total alkalinity.