Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6680662 | Applied Energy | 2018 | 7 Pages |
Abstract
High-solids simultaneous saccharification and fermentation integrating single-stage anaerobic digestion was designed for bioenergy conversion from steam-exploded Pennisetum purpereum, a perennial C4 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 62.6â¯Â±â¯1.9â¯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 30â¯days. The high performance was achieved at OLR of 6.0â¯g VS·Lâ1â¯dâ1, average yielding 358.7L CH4 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: 121.6â¯g ethanolâ¯+â¯110.6â¯g methane per kilogram grass with a finally 89.6% of cellulose recoveryâ¯+â¯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.
Keywords
Related Topics
Physical Sciences and Engineering
Energy
Energy Engineering and Power Technology
Authors
Jiliang Du, Le Chen, Jianan Li, Ranan Zuo, Xiushan Yang, Hongzhang Chen, Xinshu Zhuang, Shen Tian,