Fig. 6

Time course profile of Clostridium sp. AWRP grown in a bioreactor. The gas was initially fed with pressurization of the headspace at 50 kPa until 30 h, followed by continuous flow at the ambient pressure. The pH was controlled from 35 h using ammonia (when pH ≤ 5.0) and HCl (when pH ≥ 5.8) solutions