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http://dx.doi.org/10.17137/korrae.2018.26.1.47

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

Lee, Wontae (Department of Environmental Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.26, no.1, 2018 , pp. 47-53 More about this Journal
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.
Keywords
Lactic acid; Fermentation; Chemical precipitation; Resource recovery;
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