A comprehensive study on volatile fatty acids production from rice straw coupled with microbial community analysis

Rice straw is one of the most abundant renewable energy sources available. Through anaerobic acidogenesis, the substance of rice straw can be converted to volatile fatty acids (VFAs). VFAs itself is of value and is a precursor to biofuels. Hence, it can be converted to mixed alcohols by addition of...

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Bibliographic Details
Published in:Bioprocess and biosystems engineering 2015-06, Vol.38 (6), p.1157-1166
Main Authors: Park, Gwon Woo, Seo, Charles, Jung, Kwonsu, Chang, Ho Nam, Kim, Woong, Kim, Yeu-Chun
Format: Article
Language:English
Subjects:
Anaerobic digestion
Anaerobiosis
Biofuels
Biomass
Biotechnology
Carbon sources
Chemistry
Chemistry and Materials Science
Crop production
Dominant species
Environmental Engineering/Biotechnology
Fatty acids
Fatty Acids, Volatile - biosynthesis
Food Science
Industrial and Production Engineering
Industrial Chemistry/Chemical Engineering
Original Paper
Oryza - metabolism
Oryza - microbiology
Phylogeny
Polymerase Chain Reaction
Renewable energy sources
Rice
Rice straw
Studies
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Summary:Rice straw is one of the most abundant renewable energy sources available. Through anaerobic acidogenesis, the substance of rice straw can be converted to volatile fatty acids (VFAs). VFAs itself is of value and is a precursor to biofuels. Hence, it can be converted to mixed alcohols by addition of hydrogen, and biodiesel can be produced as a carbon source for oleaginous microorganism. To maximize VFAs production during anaerobic digestion (AD), response surface analysis (RSM) was carried out with respect to temperature, substrate concentration, and pH variables. Optimization results showed maximal VFAs concentration of 12.37 g/L at 39.23 °C, 52.85 g/L of rice straw, and pH 10. In quantification of microbial community by quantitative polymerase chain reaction, the bacterial profile showed that the growth of methanogens was effectively inhibited by methanogenic inhibitors. Furthermore, 454 pyrosequencing showed that members of the Ruminococcaceae family, capable of hydrolyzing lignocellulosic biomass, were the most dominant species in many RSM trials. This study provided a useful insight on the biological improvement of AD performance through the combinational linkage between process parameters and microbial information.
ISSN:1615-7591
1615-7605
DOI:10.1007/s00449-015-1357-z