Fig. 3

Sulphur availability in autotrophic batch process with C. ragsdalei in a continuously gassed STR: cell dry weight (A CDW) concentration, cysteine concentration (B), and hydrogen sulfide in exhaust gas (C). The batch processes were operated at a working volume of 1 L, volumetric power input of 3.5 W L⁻¹, pH 6.0, and a gas flow rate of 5 NL h⁻¹ with an inlet partial pressure of 0.2 bar H₂, 0.2 bar CO₂, and 0.6 bar CO. The batch process was conducted in triplicate; H₂S in the exhaust is shown without standard deviations