Assessment of Shock Pretreatment of Corn Stover Using the Carboxylate Platform

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• 作者：Pratik Darvekar ; Mark T. Holtzapple
• 关键词：Lignocellulose ; Enzymatic hydrolysis ; Mixed ; culture fermentations ; Shock pretreatment ; Continuum particle distribution modeling (CPDM)
• 刊名：Applied Biochemistry and Biotechnology
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：178
• 期：6
• 页码：1081-1094
• 全文大小：696 KB
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• 作者单位：Pratik Darvekar (1)
  Mark T. Holtzapple (1)
  
  1. Department of Chemical Engineering, Texas A&M University, 3122 TAMU Room 626, College Station, TX, 77843-3122, USA
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Biochemistry
  
• 出版者：Humana Press Inc.
• ISSN：1559-0291

文摘

Corn stover was pretreated with lime and shock, a mechanical process that uses a shockwave to alter the biomass structure. Two pretreatments (lime-only and lime + shock) were evaluated using enzymatic hydrolysis, batch mixed-culture fermentations, and continuous countercurrent mixed-culture fermentation. In a 120-h enzymatic hydrolysis, shock pretreatment increased the glucan digestibility of submerged lime pretreatment (SLP) corn stover by 3.5 % and oxidative lime pretreatment (OLP) corn stover by 2.5 %. The continuum particle distribution model (CPDM) was used to simulate a four-stage continuous countercurrent mixed-culture fermentation using empirical rate models obtained from simple batch experiments. The CPDM model determined that lime + shock pretreatment increased the total carboxylic acids yield by 28.5 % over lime-only pretreatment in a countercurrent fermentation with a volatile solids loading rate (VSLR) of 12 g/(L/day) and liquid retention time (LRT) of 30 days. In a semi-continuous countercurrent fermentation performed in the laboratory for 112 days with a VSLR of 1.875 g/(L day) and LRT of 16 days, lime + shock pretreatment increased the total carboxylic acid yield by 14.8 %. The experimental results matched closely with CPDM model predictions (4.05 % error).