Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Bioelectrochemical Detoxification of Phenolic Compounds during Enzymatic Pre-Treatment of Rice Straw

  • Kondaveeti, Sanath (Department of Chemical Engineering, Konkuk University) ;
  • Pagolu, Raviteja (Department of Chemical Engineering, Konkuk University) ;
  • Patel, Sanjay K.S. (Department of Chemical Engineering, Konkuk University) ;
  • Kumar, Ashok (Department of Chemical Engineering, Konkuk University) ;
  • Bisht, Aarti (Department of Chemical Engineering, Konkuk University) ;
  • Das, Devashish (Department of Chemical Engineering, Konkuk University) ;
  • Kalia, Vipin Chandra (Department of Chemical Engineering, Konkuk University) ;
  • Kim, In-Won (Department of Chemical Engineering, Konkuk University) ;
  • Lee, Jung-Kul (Department of Chemical Engineering, Konkuk University)
  • Received : 2019.09.23
  • Accepted : 2019.10.27
  • Published : 2019.11.28
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Abstract

The use of lignocellulosic biomass such as rice straw can help subsidize the cost of producing value-added chemicals. However, inhibitory compounds, such as phenolics, produced during the pre-treatment of biomass, hamper the saccharification process. Laccase and electrochemical stimuli are both well known to reduce phenolic compounds. Therefore, in this study, we implemented a bioelectrochemical detoxification system (BEDS), a consolidated electrochemical and enzymatic process involving laccase, to enhance the detoxification of phenolics, and thus achieve a higher saccharification efficiency. Saccharification of pretreated rice straw using BEDS at 1.5 V showed 90% phenolic reduction (Phr), thereby resulting in a maximum saccharification yield of 85%. In addition, the specific power consumption when using BEDS (2.2 W/Kg Phr) was noted to be 24% lower than by the electrochemical process alone (2.89 W/kg Phr). To the best of our knowledge, this is the first study to implement BEDS for reduction of phenolic compounds in pretreated biomass.

Keywords

References

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