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Fig. 1 | Biotechnology for Biofuels

Fig. 1

From: Development and characterization of stable anaerobic thermophilic methanogenic microbiomes fermenting switchgrass at decreasing residence times

Fig. 1

Microbiome performance shown by time-course measurements. a Biogas production rate (mL/day) vs. time. b Volatile fatty acids (VFA) concentration (g/L) and pH vs. time. c Fractional carbohydrate solubilization vs. time. R1 was the control reactor and maintained at residence time (RT) = 20 days throughout. R2 and R3 had decreasing RTs (20 days, 10 days, 5 days and 3.3 days) with each RT’s period indicated by dashed black lines. Biogas production was recorded once per sampling interval (1/10th RT) and normalized to daily rate assuming constant rate during per interval. pH data was automatically acquired once per 5 min and subsampled to 3–4 data points per day to be shown in figure. FCS data were calculated based on total carbohydrates loaded and total residual carbohydrate in each sample. Acid concentration and FCS results are expressed as mean ± SD

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