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Recovery and Characterization of Lactic Acid from Fermentation Broth Using Chemical Precipitation

화학침전을 이용한 발효액의 젖산 회수 및 유기물 특성분석

  • Lee, Wontae (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 이원태 (금오공과대학교 환경공학과)
  • Received : 2018.03.21
  • Accepted : 2018.03.27
  • Published : 2018.03.30

Abstract

Recovery of lactic acid from fermentation broth using chemical precipitation was investigated with various chemicals. Effects of chemical types, mixing speeds, settling duration, and solvent addition were evaluated to improve the recovery rates of lactic acid. Overall, recovery efficiencies increased as the dosage of chemicals increased. Recovery rate of lactic acid by CaO was higher than those of $Ca(OH)_2$ and $CaCO_3$. Recovery of lactic acid increased by 48% under the optimized reaction conditions which included a mixing speed at 180 rpm, a settling duration of 24 h, and addition of ethanol at 25%(v/v). Practical application needs to consider types and concentrations of other organic acids as well as lactic acid. Based upon the results of fluorescence excitation emission matrix (FEEM), size exclusion chromatography (SEC), characteristics of recovered lactic acid were same as that in the fermentation broth.

Acknowledgement

Supported by : 금오공과대학교

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