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Alkaline-assisted screw press pretreatment affecting enzymatic hydrolysis of wheat straw

机译：碱性辅助螺旋压榨预处理对小麦秸秆酶解的影响

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摘要

Screw press processing of biomass can be considered as a suitable mechanically based pretreatment for biofuel production since it disrupts the structure of lignocellulosic biomass with high shear and pressure forces. The combination with chemical treatment has been suggested to increase the conversion of lignocellulosic biomass to fermentable sugars. Within the study, the synergetic effect of alkaline (sodium hydroxide, NaOH) soaking and screw press pretreatment on wheat straw was evaluated based on, e.g., sugar recovery and energy efficiency. After alkaline soaking (at 0.1 M for 30 min) and sequential screw press pretreatment with various screw press configurations and modified screw barrel, the lignin content of pretreated wheat straw was quantified. In addition, the structure of pretreated wheat straw was investigated by scanning electron microscopy and measurement of specific surface area. It could be shown that removal of lignin is more important than increase of surface area of the biomass to reach a high sugar recovery. The rate constant of the enzymatic hydrolysis increased from 1.1 x 10(-3) 1/h for the nontreated material over 2.3 x 10(-3) 1/h for the alkalinesoaked material to 26.9 x 10(-3) 1/h for alkaline-assisted screw press pretreated material, indicating a nearly 25-fold improvement of the digestibility by the combined chemomechanical pretreatment. Finally, the screw configuration was found to be an important factor for improving the sugar recovery and for reducing the specific energy consumption of the screw press pretreatment.
机译：可以将生物质的螺旋压榨处理视为用于生物燃料生产的合适的基于机械的预处理，因为它以高的剪切力和压力破坏了木质纤维素生物质的结构。已建议将化学处理与化学处理相结合可提高木质纤维素生物质向可发酵糖的转化率。在该研究中，基于糖回收率和能源效率等方面，评估了碱性（氢氧化钠，NaOH）浸泡和螺旋压榨预处理对麦草的协同作用。碱浸（在0.1 M下浸泡30分钟）并用各种螺杆压力机配置和改进的螺杆机筒依次进行螺杆压力机预处理后，对预处理过的小麦秸秆中木质素含量进行定量。另外，通过扫描电子显微镜和比表面积的测量研究了预处理的麦秸的结构。可以证明，去除木质素比增加生物质的表面积以达到高糖回收率更为重要。酶促水解的速率常数从未经处理的材料的1.1 x 10（-3）1 / h超过了碱浸的材料的2.3 x 10（-3）1 / h到26.9 x 10（-3）1 / h碱辅助螺旋压榨预处理的材料，表明通过组合化学机械预处理可以将消化率提高近25倍。最后，发现螺杆构型是改善糖回收和降低螺杆压榨预处理的比能耗的重要因素。

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  • 来源
    《Bioprocess and Biosystems Engineering》 |2017年第2期|221-229|共9页
  • 作者

    Yan Qingqi; Wang Yumei; Rodiahwati Wawat; Spiess Antje; Modigell Michael;

  • 作者单位

    Rhein Westfal TH Aachen, Mech Proc Engn, Aachener Verfahrenstech, Turmstr 46, D-52064 Aachen, Germany;

    Rhein Westfal TH Aachen, Enzyme Proc Technol, Aachener Verfahrenstech, Worringer Weg 1, D-52074 Aachen, Germany|DWI Leibniz Inst Interact Mat Res, Forckenbeckstr 50, D-52074 Aachen, Germany;

    King Mongkuts Univ Technol, Thai German Grad Sch Engn, Dept Chem & Proc Engn, Bangkok 10800, Thailand;

    Rhein Westfal TH Aachen, Enzyme Proc Technol, Aachener Verfahrenstech, Worringer Weg 1, D-52074 Aachen, Germany|DWI Leibniz Inst Interact Mat Res, Forckenbeckstr 50, D-52074 Aachen, Germany|Tech Univ Carolo Wilhelmina Braunschweig, Inst Biochem Engn IBVT, Rebenring 56, D-38106 Braunschweig, Germany;

    Rhein Westfal TH Aachen, Mech Proc Engn, Aachener Verfahrenstech, Turmstr 46, D-52064 Aachen, Germany;

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  • 关键词

    Pretreatment; Lignocellulose; Screw press; Enzymatic hydrolysis;

    机译：预处理;木质纤维素;螺旋压榨;酶促水解;

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