High-solids ethanol fermentation with single-stage methane anaerobic digestion for maximizing bioenergy conversion from a C4 grass (Pennisetum purpereum)
메타 데이터
바이오화학분류
바이오플라스틱
플라스틱
바이오정밀화학
용매
화학제품
연료
화장품용 기능성소재
계면활성제⁄증점제
의료용 화학소재
식품첨가제
논문
High-solids ethanol fermentation with single-stage methane anaerobic digestion for maximizing bioenergy conversion from a C4 grass (Pennisetum purpereum)
<P><B>Abstract</B></P> <P>High-solids simultaneous saccharification and fermentation integrating single-stage anaerobic digestion was designed for bioenergy conversion from steam-exploded <I>Pennisetum purpereum</I>, a perennial C<SUB>4</SUB> grass. Three scenarios for ethanol production, methane production and ethanol-methane co-production were investigated and compared in terms of production yield. A terminal ethanol titer of 62.6 ± 1.9 g/L with the highest ethanol yield of 90.9% was achieved when the fed-batch mode was carried out at a final substrate loading of 35% (w/v) dry matter content. The ethanol stillage was used for methane production in a semi-continuous CSTR system operated with different organic loading rates (OLRs) at a hydraulic retention time (HRT) of 30 days. The high performance was achieved at OLR of 6.0 g VS·L<SUP>−1</SUP> d<SUP>−1</SUP>, average yielding 358.7L CH<SUB>4</SUB> per kilogram volatile solid (VS) with a total VS removal rate of 73.8%. On the basis of mass balance, the overall production yield achieved in this study was: 121.6 g ethanol + 110.6 g methane per kilogram grass with a finally 89.6% of cellulose recovery + 62.5% hemicellulose recovery. These results indicated that the high-solids ethanol fermentation with single-stage methane anaerobic digestion of lignocellulosic biomass is a valid approach to maximize the holocellulose bioconversion and improve the bioenergy production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High-solids SSF integrating single-stage anaerobic digestion was established. </LI> <LI> High titer ethanol of 62.6 g/L was achieved with a final substrate loading of 35%. </LI> <LI> Stable performance was achieved in semi-continuous CSTR at OLR of 6.0 g VS·L<SUP>−1</SUP> d<SUP>−1</SUP>. </LI> <LI> The overall production yield was: 121.6 g ethanol + 110.6 g methane/kg dry grass. </LI> </UL> </P>