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http://dx.doi.org/10.7464/ksct.2013.19.2.148

Volatile Fatty Acid Production from Saccharina japonica Extracts by Anaerobic Fermentation: Evaluation of Various Environmental Parameters for VFAs Productivity  

Choi, Jae Hyung (Department of Chemical Engineering, Pukyong National University)
Song, Min Kyung (The Institute of Cleaner Production Technology, Pukyong National University)
Chun, Byung Soo (Department of Food Science and Technology, Pukyong National University)
Lee, Chul Woo (Department of Chemical Engineering, Hanbat National University)
Woo, Hee Chul (Department of Chemical Engineering, Pukyong National University)
Publication Information
Clean Technology / v.19, no.2, 2013 , pp. 148-155 More about this Journal
Abstract
Volatile fatty acids (VFAs) production from marine brown algae, Saccharina japonica, was investigated in anaerobic dark fermentation. In order to evaluate the VFAs productivity, various experimental parameters (i.e., physicochemical pre-treatment, microorganism inoculation ratio, substrate concentration, and pH) were evaluated. According to the physicochemical pre-treatment methods, the maximum concentrations of VFAs were obtained in the order of sulfuric acid, subcritical water and subcritical water with lipid-extraction. Also, we investigated the operating parameters such as microorganism inoculation ratio (MV/M = 10 to 30), the substrate concentration (18.0 to 72.0 g/L) and pH (6.0 to 7.0) in sulfuric acid pre-treatment method. When the substrate concentrations were 18.0, 36.0, 54.0 and 72.0 g/L at $35^{\circ}C$, microorganism inoculation ratio 15, pH 7.0 for 372 hours, the maximum concentrations of VFAs were respectively 9.8, 13.9, 18.6 and 22.3 g/L. The change in VFAs concentrations was detected that acetic- and propionic acids increased according to increasing pH, while the butyric acid increased with decreasing pH. The VFAs obtained from concentration and separation process may be used as basic chemistry materials and bio-fuel, and they will expect to produce alternative energy of fossil fuel.
Keywords
Saccharina japonica; Anaerobic dark fermentation; Volatile fatty acids; Physicochemical pre-treatment extracts;
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