Biotechnology and Bioprocess Engineering

, Volume 11, Issue 4, pp 313–318

Recovery of lactic acid from fermentation broth by the two-stage process of nanofiltration and water-splitting electrodialysis

  • Eun Gyo Lee
  • Sang Hyeon Kang
  • Hyun Han Kim
  • Yong Keun Chang
Article

DOI: 10.1007/BF03026246

Cite this article as:
Lee, E.G., Kang, S.H., Kim, H.H. et al. Biotechnol. Bioprocess Eng. (2006) 11: 313. doi:10.1007/BF03026246

Abstract

A two-stage process of nanofiltration and water-splitting electrodialysis was investigated for lactic acid recovery from fermentation broth. In this process, sodium lactate is isolated from fermentation broth in the first stage of nanofiltration by using an NTR-729HF membrane, and then is converted to lactic acid in the second stage by water-splitting electrodialysis. To determine the optimal operating conditions for nanofiltration, the effects of pressure, lactate concentration, pH and known added impurities were studied. Lactate rejection was less than 5%, magnesium rejection approximated 45%, and calcium rejection was at 40%. In subsequent water-splitting electrodialysis, both the sodium lactate conversion to lactic acid and sodium hydroxide recovery, were about 95%, with a power requirement of 0.9∼1.0 kWh per kg of lactate.

Keywords

lactic acid nanofiltration water-splitting electrodialysis 

Copyright information

© The Korean Society for Biotechnology and Bioengineering 2006

Authors and Affiliations

  • Eun Gyo Lee
    • 1
  • Sang Hyeon Kang
    • 1
  • Hyun Han Kim
    • 1
  • Yong Keun Chang
    • 1
  1. 1.Department of Chemical and Biomolecular EngineeringKorea Advanced Institute of Science and TechnologyDaejeonKorea

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