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Bioresour Technol

Title:		Influence of temperature on volatile fatty acid production and microbial community structure during anaerobic fermentation of microalgae
Author(s):		Cho HU; Kim YM; Choi YN; Kim HG; Park JM;
Address:		"School of Environmental Science and Engineering, Pohang University of Science and Technology Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 500-712, Republic of Korea. Department of Chemical Engineering, Pohang University of Science and Technology Hyoja-dong, Nam-Gu, Pohang, Kyungbuk 790-784, Republic of Korea. 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"
Journal Title:		Bioresour Technol
Year:		2015
Volume:		20150306
Issue:
Page Number:		475 - 480
DOI:		10.1016/j.biortech.2015.03.009
ISSN/ISBN:		1873-2976 (Electronic) 0960-8524 (Linking)
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 degrees 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 degrees C than at mesophilic temperatures, suggesting that this microorganism contributed significantly to the higher hydrolysis rate and VFA yield at this operating temperature"
Keywords:		*Anaerobiosis Biomass Bioreactors Fatty Acids/*biosynthesis *Fermentation Microalgae/*metabolism *Temperature Volatilization Bacterial communities Hydrolysis Microalgal biomass Temperature Volatile fatty acids (VFAs);
Notes:		"MedlineCho, Hyun Uk Kim, Young Mo Choi, Yun-Nam Kim, Hye Gyeong Park, Jong Moon eng Research Support, Non-U.S. Gov't England 2015/03/21 Bioresour Technol. 2015 Sep; 191:475-80. doi: 10.1016/j.biortech.2015.03.009. Epub 2015 Mar 6"