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Bioaugmentation with an acetate-type fermentation bacterium Acetobacteroides hydrogenigenes improves methane production from corn straw

Zhang, Jie, Guo, Rong-Bo, Qiu, Yan-Ling, Qiao, Jiang-Tao, Yuan, Xian-Zheng, Shi, Xiao-Shuang, Wang, Chuan-Shui
Bioresource technology 2015 v.179 pp. 306-313
acetates, anaerobic digestion, bacteria, bioaugmentation, cellulose, corn straw, fermentation, hexoses, hydrogen, lignocellulose, methane, methane production, methylcellulose, models, pentoses, xylan
The effect of bioaugmentation with an acetate-type fermentation bacterium in the phylum Bacteroidetes on the anaerobic digestion of corn straw was evaluated by batch experiments. Acetobacteroides hydrogenigenes is a promising strain for bioaugmentation with relatively high growth rate, hydrogen yields and acetate tolerance, which ferments a broad spectrum of pentoses, hexoses and polyoses mainly into acetate and hydrogen. During corn straw digestion, bioaugmentation with A. hydrogenigenes led to 19–23% increase of the methane yield, with maximum of 258.1mL/g-corn straw achieved by 10% inoculation (control, 209.3mL/g-corn straw). Analysis of lignocellulosic composition indicated that A. hydrogenigenes could increase removal rates of cellulose and hemicelluloses in corn straw residue by 12% and 5%, respectively. Further experiment verified that the addition of A. hydrogenigenes could improve the methane yields of methyl cellulose and xylan (models for cellulose and hemicelluloses, respectively) by 16.8% and 7.0%.