Skip navigation
Please use this identifier to cite or link to this item:
Title: Optimization of microwave and NaOH pretreatments of wheat straw for enhancing biofuel yield
Authors: Tsegaye B.
Balomajumder, Chandrajit
Roy, Partha
Published in: Energy Conversion and Management
Abstract: In this study, microwave assisted NaOH pretreatment of wheat straw was thoroughly investigated using central composite design (CCD) under varying operating variables. i.e. pretreatment time, temperature and NaOH concentration. The crystallinity, crystalline length, surface microstructural change, functional group change and compositional analysis of both optimally pretreated and untreated wheat straw samples were studied. Microbial hydrolysis by Bacillus sp. BMP01 and bioethanol production was also tested for the optimally pretreated wheat straw sample. The pretreatment condition at 160 °C, 1.5% NaOH concentration and 15 min preserved high cellulose and removed high amount of lignin. At this point 38.34% of hemicellulose and 74.15% of cellulose were preserved in the solid residue and 69.49% of lignin was solubilized. An overall increase in crystallinity (from 0.3780 to 0.5610) and crystalline length (from 2.51 to 4.83 nm) were observed after the pretreatment process. Mathematical models were developed to predict the lignin removal, cellulose preserved and hemicellulose solubilization during microwave assisted NaOH pretreatment process. 718 mg/g of reducing sugar was released after hydrolysis pretreated wheat straw by Bacillus sp. BMP01. Ethanol yield of 68.2% was obtained after 96 h of fermentation. It was found that the combination of microwave assisted NaOH pretreatment at optimal condition coupled with microbial hydrolysis and C5 and C6 fermenting microbes enhanced reducing sugar and ethanol yields. © 2019 Elsevier Ltd
Citation: Energy Conversion and Management(2019), 186(): 82-92
Issue Date: 2019
Publisher: Elsevier Ltd
Keywords: Bioethanol
Microwave pretreatment
Wheat straw
ISSN: 1968904
Author Scopus IDs: 57200083531
Author Affiliations: Tsegaye, B., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Balomajumder, C., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Roy, P., Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Funding Details: The authors are thankful to Indian Institute of Technology Roorkee, India for providing necessary facilities and technical support. One of the authors, Bahiru Tsegaye would like to thank the Ministry of Education of Ethiopia for providing him, fellowship.
Corresponding Author: Tsegaye, B.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email:
Appears in Collections:Journal Publications [BT]
Journal Publications [CH]

Files in This Item:
There are no files associated with this item.
Show full item record

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.