4.8 Article

Feasibility assessment of bioethanol production from humic acid-assisted alkaline pretreated Kentucky bluegrass (Poa pratensis L.) followed by downstream enrichment using direct contact membrane distillation

期刊

BIORESOURCE TECHNOLOGY
卷 360, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127521

关键词

Kentucky bluegrass; Humic acid; Cellulosic ethanol; Membrane distillation; Downstream purification

资金

  1. Creative and Challenging Research Program [2021R1I1A1A01060846]
  2. National Research Foundation (NRF) of the Republic of Korea [2020R1A2C3004237]
  3. King Saud University, Riyadh, Saudi Arabia [RSP2021/345]
  4. King Saud University, Riyadh, Saudi Arabia
  5. National Research Foundation of Korea [2020R1A2C3004237] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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In this study, the use of humic acid for pretreating lignocellulosic biomass in alkaline conditions was successfully applied to separate lignin and hydrolyzable biocomponents. The resulting biomass hydrolysate was then converted into ethanol through enzymatic saccharification and yeast fermentation. The ethanol product was then separated and concentrated using membrane distillation, yielding a high flux of ethanol.
The effective fractionation of structural components of abundantly available lignocellulosic biomass is essential to unlock its full biorefinery potential. In this study, the feasibility of humic acid on the pretreatment of Kentucky bluegrass biomass in alkaline condition was assessed to separate 70.1% lignin and hydrolyzable biocomponents. The humic acid-assisted delignification followed by enzymatic saccharification yielded 0.55 g/g of reducing sugars from 7.5% (w/v) pretreated biomass loading and 16 FPU/g of cellulase. Yeast fermentation of the biomass hydrolysate produced 76.6% (w/w) ethanol, which was subsequently separated and concentrated using direct contact membrane distillation. The hydrophobic microporous flat-sheet membrane housed in a rectangularshaped crossflow module and counter-current mode of flow of the feed (hot) and distillate (cold) streams yielded a flux of 11.6 kg EtOH/m2/24 h. A modular, compact, flexible, and eco-friendly membrane-integrated hybrid

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