Effects of different pretreatment strategies on corn stalk acidogenic fermentation using a microbial consortium |
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Authors: | Guo Peng Mochidzuki Kazuhiro Cheng Wei Zhou Ming Gao Hong Zheng Dan Wang Xiaofen Cui Zongjun |
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Affiliation: | a Institute of Agricultural Products Processing and Nuclear Agriculture Technology Research, Hubei Academy of Agricultural Sciences, Wuhan 430064, China b College of Agronomy and Biotechnology/Center of Biomass Engineering, China Agricultural University, Beijing 100193, China c Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan d Guangxi Soil and Fertilizer Station, Nanning 530007, China |
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Abstract: | The effects of sulfuric acid, acetic acid, aqueous ammonia, sodium hydroxide, and steam explosion pretreatments of corn stalk on organic acid production by a microbial consortium, MC1, were determined. Steam explosion resulted in a substrate that was most favorable for microbial growth and organic acid productions. The total amounts of organic acids produced by MC1 on steam exploded, sodium hydroxide, sulfuric acid, acetic acid, and aqueous ammonia pretreated corn stalk were 2.99, 2.74, 1.96, 1.45, and 2.21 g/l, respectively after 3 days of fermentation at 50 °C. The most prominent organic products during fermentation of steam-exploded corn stalks were formic (0.86 g/l), acetic (0.59 g/l), propanoic (0.27 g/l), butanoic (0.62 g/l), and lactic acid (0.64 g/l) after 3 days of fermentation; ethanol (0.18 g/l), ethanediol (0.68 g/l), and glycerin (3.06 g/l) were also produced. These compounds would be suitable substrates for conversion to methane by anaerobic digestion. |
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Keywords: | Microbial consortium Lignocellulose degradation Pretreatments Acidogenic fermentation Volatile fatty acid (VFA) |
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