Process development and modeling of pyruvate recovery from a model solution and fermentation broth

The mono- and bi-polar electrodialysis processes for pyruvate recovery and pyruvic acid generation, respectively, were examined in order to determine their feasibility for application in the pyruvate production process. Under optimum process conditions (constant current mode i = 39.7 A m⁻², pyruvate model solution c_p = 50 g dm⁻³ in the monopolar electrodialysis experiment pyruvate flux reached 367 g m⁻² h⁻¹ and specific energy consumption was 1.4 kWh kg⁻¹. In the bi-polar electrodialysis experiment under optimum process conditions (constant current mode i = 9.6 A m⁻², pyruvate model solution c_p = 48 g dm⁻³, pyruvate flux reached 125 g m⁻² h⁻¹ and specific energy consumption was 1.5 kWh kg^-1. Generally speaking, performances of the bi-polar electrodialysis were equal to the best process conditions observed with mono-polar electrodialysis. On the other hand, current densities investigated in the bi-polar electrodialysis experiments were four-fold lower than those applied in the mono-polar electrodialysis experiments. Additionally, a mathematical model to represent the ion and water transport behavior of an electrodialysis process for concentrating pyruvic acid under the influence of different current density was developed. Estimation of both the model parameters and model validation were demonstrated in the work.