Table 2.

Characterization of spent sulfite liquor.

Component	Value
Density (20 °C)	1060 kg·m−3
pH (20 °C)	2.7
Dry residue (after 72 h at 105 °C)	12.5%
Ignition loss (550 °C)	88.8%
Chemical oxygen demand	138.3 mg·kg−1
Glucose	0.39 g·kg−1
Xylose	11.48 g·kg−1
Galactose and rhamnose	1.02 g·kg−1
Arabinose	0.20 g·kg−1
Mannose	0.56 g·kg−1
Methanol	320 mg·kg−1
Ethanol	50 mg·kg−1
Hydroxymethylfurfural	24 mg·kg−1
Acetic acid	9.0 g·kg−1