title: Influence of temperature on volatile fatty acid production and microbial community structure during anaerobic fermentation of microalgae.
abstract: The objectives of this study were to investigate the effect of operating temperature on volatile fatty acids (VFAs) production from microalgal biomass, and to clarify the relationships between VFAs accumulation at different temperatures and the corresponding bacterial communities. The VFA yields were 0.10±0.017, 0.12±0.008, and 0.34±0.009 g/g VS at 35, 45, and 55 °C, respectively. The proportion of acetic acid decreased from 85.6% to 65.8% as operating temperature increased, whereas that of propionic acid increased from near 0% to 15.5% and that of iso-valeric acid remained relatively stable (10.2-11.2%). Bacterial communities at different operating temperatures consisted mostly of the phyla Proteobacteria, Bacteroidetes, and Firmicutes, which can degrade organic compounds effectively. Bacillus sp. was more predominant at 55 °C than at mesophilic temperatures, suggesting that this microorganism contributed significantly to the higher hydrolysis rate and VFA yield at this operating temperature.
authors: School of Environmental Science and Engineering, Pohang University of Science and Technology Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea.
authors: Hyun Uk
authors: HU
authors: Cho
authors: School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 500-712, Republic of Korea.
authors: Young Mo
authors: YM
authors: Kim
authors: Department of Chemical Engineering, Pohang University of Science and Technology Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea.
authors: Yun-Nam
authors: YN
authors: Choi
authors: School of Environmental Science and Engineering, Pohang University of Science and Technology Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea.
authors: Hye Gyeong
authors: HG
authors: Kim
authors: School of Environmental Science and Engineering, Pohang University of Science and Technology Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea; Department of Chemical Engineering, Pohang University of Science and Technology Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea; Division of Advanced Nuclear Engineering, Pohang University of Science and Technology Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea. Electronic address: jmpark@postech.ac.kr.
authors: Jong Moon
authors: JM
authors: Park
mesh_terms: D000693:Anaerobiosis; D018533:Biomass; D019149:Bioreactors; D005227:Fatty Acids / Q000096:biosynthesis*; D005285:Fermentation; D058086:Microalgae / Q000378:metabolism*; D013696:Temperature; D014835:Volatilization
chemical_list: D005227:Fatty Acids
keywords: Bacterial communities; Hydrolysis; Microalgal biomass; Temperature; Volatile fatty acids (VFAs)