Figure 1
Optimization of initial gas stripping time by CO 2 weight loss rate and fermentation dynamics for ethanol production during TS-SSF and GS-SSF. (A) CO2 weight loss rate. (B) Ethanol/sugar content in TS-SSF. (C) Ethanol/sugar content in GS-SSF. Fermentation conditions for determination of CO2 weight loss rate (A): 70% moisture content, pH 5.0, 35°C, 0.5 g yeast/100 g SSS (DM), 2.0 cm long, and 0.15 cm thickness of particle. CO2 weight loss rate is defined as CO2 weight loss per 2 h. TS-SSF conditions (B): 70% moisture content, pH 5.0, 35°C, 0.5 g yeast/100 g SSS (DM), 2.0 cm long, and 0.15 cm thickness of particle. GS-SSF conditions (C): 70% moisture content, pH 5.0, 35°C, 0.5 g yeast/100 g SSS (DM), 2.0 cm long, and 0.15 cm thickness of particle; initial gas stripping time 10 h. DM, dry matter; GS-SSF, gas stripping solid state fermentation; SSS, sweet sorghum stalk; TS-SSF, traditional static solid state fermentation.