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Fig. 5 | Bioresources and Bioprocessing

Fig. 5

From: Continuous sulfide supply enhanced autotrophic production of alcohols with Clostridium ragsdalei

Fig. 5

Variation of pH profiles and temperatures in autotrophic sulfide fed-batch processes with C. ragsdalei in a continuously gassed STR. Cell dry weight (A CDW) and product concentrations (B acetate; D ethanol; E 2,3-butanediol) as well as CO uptake rates (F rCO). Parameter combinations are shown in C: pH 6.0 and 32 °C (black diamonds, black lines), pH 5.5 and 37 °C (blue squares, blue lines) and pH 5.5 and 32 °C (red triangles, red lines). The fed-batch processes were operated at a Na2S 9 H2O feed rate of 0.05 mmol L−1 h−1, working volume of 1 L, volumetric power input of 3.5 W L−1, gas flow rate of 5 NL h−1 and an inlet partial pressure of 0.2 bar H2, 0.2 bar CO2, and 0.6 bar CO

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