Abstract
The efficiency of bipolar electrodialysis (BED) for the recovery of lactic acid from fermentation broth was evaluated. Three systems of BED (bipolar-anion, bipolar-cation and bipolar-anion-cation) at fixed voltage (20 V) were compared using a model solution of ammonium lactate (100 g l−1). Results showed that bipolar-anion (BED-anion) was the most beneficial in terms of lactate flux, current efficiency, energy consumption and recovery ratio. Consequently, BED-anion was used to purify lactic acid from fermentation broth which had been pre-treated with mono-polar electrodialysis (MED). The final lactic acid concentration and lactate flux obtained were 144 g l−1 and 393 g m−2 h−1, respectively. Using the two-step process (MED and BED-anion) the concentration of fermentation broth was increased by 33% and the total energy consumption was 2.76 kW h kg−1.
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Acknowledgement
A part of this study was supported by the New Energy and Industrial Technology Development Organization (NEDO) and Graduate Research Scholarship from the Graduate School, Kasetsart University.
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Timbuntam, W., Sriroth, K., Piyachomkwan, K. et al. Application of bipolar electrodialysis on recovery of free lactic acid after simultaneous saccharification and fermentation of cassava starch. Biotechnol Lett 30, 1747–1752 (2008). https://doi.org/10.1007/s10529-008-9771-9
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DOI: https://doi.org/10.1007/s10529-008-9771-9