High productivity ethanol from high-solid fermentation of mixed organic solvent pretreated poplar by feeding solid with ∼50 % water content

Xinwen Zhang, Jun Xie and Hongdan Zhang

Energy, 2025, vol. 318, issue C

Abstract: This study evaluated the influence of mixed substrates on enhancing the ethanol yield of poplar by altering feeding modes and adding surfactant to improve the efficiency of high solid simultaneous saccharification fermentation (SSF). Firstly, the synergy index of different ratios of NaOH-enhanced and AlCl3-enhanced organic solvent pretreated poplar was determined, and the mixing ratio of 6:4 was proposed with the highest synergy index of 1.07 after 48 h. Then the different proportions of dry pretreated poplar could enhance 12.16 % ethanol yield with total feeding ratio of 6:4. Furthermore, the feeding solid with 50 % water content could increase the ethanol concentration from 64.08 g/L (with dry substrates) to 74.94 g/L, this enhancement was verified by the alteration of viscosity and the increment in the physical constraint of water in the system detected by time domain NMR. In addition, by optimizing the batch feeding mode and adding 7.5 g/L tea saponin, the ethanol concentration was further increased to 93.73 g/L under 44 % solid loading, which was the highest ethanol concentration obtained from poplar in our known reports, demonstrating the effective conversion of NaOH-enhanced and AlCl3-enhanced organic solvent pretreated poplar together to ethanol.

Keywords: Mixed pretreated poplar; Synergistic effect; Water content; Ethanol (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:318:y:2025:i:c:s0360544225005481

DOI: 10.1016/j.energy.2025.134906

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