Fermentation Pilot plant (a)single-stage continuous operat ion (b)single-stage continuous operation with feedback (c)Multi-stage continuous operation: simple chain (d)Multi-stage continuous operation: Multiple substrate addition Figure 2. Homogeneous systems for continuous fermentationFermentation Pilot Plant L r I 11 1 I I mM - 0 7 - _N_v (a)Single-stage m c o n t i n u o u s o p e r a t i o n Figure 2. Homogeneous systems for continuous fermentation