Abstract
Due to their advantageous properties, polyhydroxyalkanoates are a promising alternative to conventional petroleum-based plastics. Currently, high production costs in upstream and downstream have to be reduced to make the plastic material competitive. As most of the PHA producing organisms metabolize a wide range of substrates upstream cost can be reduced using carbon rich waste material. For large scale application sophisticated control approaches based on mathematical models can help to further increase the productivity. In the present work, a hybrid cybernetic model approach is presented, which is adapted to experiments with fructose and acetate feeding, respectively. Furthermore, the validated model was used to qualitatively predict the effect of co-substrate feeding.
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