Fig. 7

Volatile fatty acids in microcosms. (a) Control; (b) hydrothermal pretreatment, 30 min, 150 °C; (c) hydrothermal-alkaline pretreatment, 0.2 mol/L NaOH, 30 min, 150 °C.
Volatile fatty acids in microcosms. (a) Control; (b) hydrothermal pretreatment, 30 min, 150 °C; (c) hydrothermal-alkaline pretreatment, 0.2 mol/L NaOH, 30 min, 150 °C.