초록
<P><B>Abstract</B></P> <P>The effect of bioaugmentation with an acetate-type fermentation bacterium in the phylum <I>Bacteroidetes</I> on the anaerobic digestion of corn straw was evaluated by batch experiments. <I>Acetobacteroides hydrogenigenes</I> 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 <I>A. hydrogenigenes</I> 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 <I>A. hydrogenigenes</I> could increase removal rates of cellulose and hemicelluloses in corn straw residue by 12% and 5%, respectively. Further experiment verified that the addition of <I>A. hydrogenigenes</I> could improve the methane yields of methyl cellulose and xylan (models for cellulose and hemicelluloses, respectively) by 16.8% and 7.0%.</P> <P><B>Highlights</B></P> <P> <UL> <LI> <I>A. hydrogenigenes</I> is an acetate-type bacterium with high hydrogen yields. </LI> <LI> Bioaugmentation potential of <I>A. hydrogenigenes</I> was investigated. </LI> <LI> Addition of <I>A. hydrogenigenes</I> improved methane yield by 19–23% from corn straw. </LI> <LI> <I>A. hydrogenigenes</I> could increase cellulose and hemicelluloses removal rates. </LI> </UL> </P>