Fig. 8

The schematic diagram of semi-continuous fermentation system. This is the schematic diagram of semi-continuous fermentation system used in this study. The fermentation reactor consisted of a pair of concentric plexiglass cylinders with 120 and 160 mm diameters, respectively. The inner cylinder, with a working volume of 2 L, was used for WAS fermentation, and the outer cylinder served as water jacket for temperature maintenance