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Modified alkaline peroxide pretreatment: An efficient path forward for bioethanol production from bamboo

Journal Article · · Energy Conversion and Management
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [2];  [6]
  1. Chinese Academy of Forestry, Nanjing (China); Nanjing Forestry University (China); University of Tennessee, Knoxville, TN (United States)
  2. Chinese Academy of Forestry, Nanjing (China); Nanjing Forestry University (China)
  3. Nanjing Forestry University (China)
  4. University of Tennessee, Knoxville, TN (United States)
  5. Chinese Academy of Forestry, Nanjing (China)
  6. University of Tennessee, Knoxville, TN (United States); University of Tennessee Institute of Agriculture, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

To overcome the typical delignification saturation point of alkaline peroxide pretreatment and further facilitate lignin removal, a novel modified alkaline hydrogen peroxide pretreatment (MAHP) was proposed by introducing ethanol into the reaction system. The dosages of H2O2, ethanol, and pretreatment temperature were optimized, and the results revealed that a maximum lignin removal as high as 79.25% could be achieved at only 100 °C, 3 wt% H2O2 concentration and 1 wt% ethanol concentration. Meanwhile, 76.5% of glucan and 56.0% of xylan were preserved at this pretreatment condition. By overcoming the delignification saturation point, enzymatic hydrolysis efficiency was remarkably enhanced, achieving 96.76% and 97.38% of glucan and xylan conversion, respectively, which are 7.4 and 11.4 times as compared to that of the untreated bamboo. Furthermore, the simultaneous saccharification and fermentation (SSF) result indicated an identical ethanol yield of ~75% when elevating the SSF solid loading from 5% to 30%. Based on the sequential SSF and xylose fermentation results, about 5.6 tons of bamboo would be consumed to produce 1 ton of ethanol. Finally, the energy balance revealed that a positive balance of 1255.4 KJ could be generated via processing 1 kg bamboo. Here, the results demonstrate that the MAHP is a promising high-efficiency pretreatment technology for bamboo due to the mild pretreatment severity and robust ethanol yield.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1669741
Journal Information:
Energy Conversion and Management, Journal Name: Energy Conversion and Management Journal Issue: 1 Vol. 224; ISSN 0196-8904
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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