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Evaluation of fuel ethanol production from aqueous ammonia-treated rice straw via simultaneous saccharification and fermentation

机译：通过同时糖化和发酵评估氨水处理的稻草中燃料乙醇的生产

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摘要

Rice straw (RS) has been considered a promising feedstock for ethanol production in Asia. However, the recalcitrance of biomass, particularly the presence of lignin, hinders the enzymatic saccharification of polysaccharides in RS and consequently decreases the ethanol yield. Here, we used aqueous ammonia pretreatment to remove lignin from RS (aRS). The reaction conditions were a solid:liquid ratio of 1:12, an ammonia concentration of 27% (w w~(-1)), room temperature, and a 2-week incubation. We evaluated enzymatic digestibility and the ethanol production yield. A 42% reduction in lignin content increased the glucan conversion of aRS to glucose from 20 to 71% using a combination of Cellic Ctec2 cellulases and Cellic Htec2 xylanases at enzyme loads of 15 FPU +100 XU g~(-1) solid. Scanning electron microscopy highlighted the extensive removal of external fibres and increased porosity of aRS, which aided the accessibility of cellulose for enzymes. Using the same enzyme dosage and a solid load of 100 g L~(-1), simultaneous saccharification and fermentation using a monoculture of Saccharomyces cerevisiae and co-culture with Candida tropkalis yielded ethanol concentrations of 22 and 25 g L~(-1), corresponding to fermentation efficiencies of 96 and 86% fermentation, respectively. The volumetric ethanol productivities for these systems were 0.45 and 0.52 g L~(-1) h~(-1). However, the ethanol yield based on the theoretical glucose and xylose concentrations was lower for the co-culture (0.44 g g~(-1)) than the monoculture (0.49 g g~(-1)) due to the low xylose consumption. Further research should optimise fermentation variables or select/improve microbial strains capable of fermenting xylose to increase the overall ethanol production yield.
机译：稻草（RS）被认为是亚洲乙醇生产的有前途的原料。但是，生物质的顽固性，特别是木质素的存在阻碍了RS中多糖的酶促糖化作用，因此降低了乙醇的收率。在这里，我们使用氨水预处理从RS（aRS）中去除木质素。反应条件为固液比为1:12，氨浓度为27％（w w〜（-1）），室温，温育2周。我们评估了酶消化率和乙醇产量。木质素含量降低42％时，在15 FPU +100 XU g〜（-1）固体的酶负载下，使用Cellic Ctec2纤维素酶和Cellic Htec2木聚糖酶可以将aRS的葡聚糖转化率从20％提高至71％。扫描电子显微镜强调了外部纤维的广泛去除和aRS孔隙率的增加，这有助于纤维素对酶的可及性。使用相同的酶剂量和100 g L〜（-1）的固体负载量，通过酿酒酵母单培养同时进行糖化和发酵，并与原假丝酵母共培养，乙醇浓度分别为22和25 g L〜（-1）。 ，分别相当于96％和86％的发酵效率。这些系统的乙醇体积生产率分别为0.45和0.52 g L〜（-1）h〜（-1）。然而，由于木糖消耗量低，因此基于理论葡萄糖和木糖浓度的乙醇共培养（0.44 g g〜（-1））比单培养（0.49 g g〜（-1））要低。进一步的研究应优化发酵变量或选择/改善能够发酵木糖以增加总乙醇产量的微生物菌株。

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  • 来源
    《Biomass & bioenergy》 |2016年第10期|150-157|共8页
  • 作者

    Paripok Phitsuwan; Chutidet Permsriburasuk; Rattiya Waeonukul; Patthra Pason; Chakrit Tachaapaikoon; Khanok Ratanakhanokchai;

  • 作者单位

    Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkuntien, Bangkok 10150, Thailand;

    Department of Chemical Engineering, Faculty of Engineering, King Mongkut's University of Technology Thonburi, Thungkru, Bangkok 10140, Thailand;

    Pilot Plant Development and Training Institute, King Mongkut's University of Technology, Thonburi, Bangkok 10150, Thailand;

    Pilot Plant Development and Training Institute, King Mongkut's University of Technology, Thonburi, Bangkok 10150, Thailand;

    Pilot Plant Development and Training Institute, King Mongkut's University of Technology, Thonburi, Bangkok 10150, Thailand;

    Division of Biochemical Technology, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkuntien, Bangkok 10150, Thailand;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aqueous ammonia pretreatment; Rice straw; Lignin; Simultaneous saccharification and fermentation; Ethanol;

    机译：氨水预处理;稻草;木质素同时进行糖化和发酵;乙醇;

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