Onome Festus
Wheat straw bio-refining. Part II: Optimization of the microwave radiation with sulphuric acid pre-treatment and its enzymatic hydrolysis for fermentable sugars
Festus, Onome; Skoulou, Vasiliki K; Zein, Sharif H.
Authors
Dr Vicky Skoulou V.Skoulou@hull.ac.uk
Graduate Research Director (GRD) of School of Engineering ; Assoc. Professor (Senior Lecturer) in Engineering (Chemical Engineering) ; PI of the B3: Biomass Waste- BioenergH2- Biochars Challenge Group of PGRs and PDRAs
Sharif H. Zein
Abstract
Background: The potential of microwave-assisted heating for enhancing the alkaline pretreatment of lignocellulosic waste is highlighted in this work.
Objective: To maximize separation of fermentable sugars from wheat straw.
Methods: Wheat straw hydrolysis assisted by microwave was carried out by setting up a statistical experimental design method and further investigating the main process parameters, namely: temperature (°C), microwave power (W), NaOH concentration (M) and wheat straw pre-treatment time (min) towards maximization of fermentable sugars extraction from wheat straw. The reducing sugars yield (response) of the alkaline pre-treated and microwaved wheat straw in lab scale provided data for building a predictive model which reflected interactions, significance and impact of the process parameters (factors) on the wheat straw hydrolysis yield.
Results: SEM and FTIR images of untreated and alkaline pre-treated wheat straw were studied for investigating the morphological changes of wheat straw surface quality and structure resulting from the microwave and/or alkaline pre-treatment. In addition reducing sugars yield of 87%wt. from wheat straw pre-treated at 180°C, 550W microwave power, 0.65M of NaOH for 25min was achieved. This result was significantly higher compared to the one from the straw which was only hydrolysed enzymatically (30 %wt).
Conclusion: It was found that shorter pre-treatment times were obtained at higher temperatures, alkali concentration and moderate microwave power levels. The results obtained were further optimized and indicated that the microwave-assisted alkaline pre-treatment of wheat straw technique is an attractive pre-treatment method which reduces the wheat straw pre-treatment time and enhances the hydrolysis yield.
Citation
Festus, O., Skoulou, V. K., & Zein, S. H. (2017). Wheat straw bio-refining. Part II: Optimization of the microwave radiation with sulphuric acid pre-treatment and its enzymatic hydrolysis for fermentable sugars. Current Microwave Chemistry, 4(4), 306-316. https://doi.org/10.2174/2213335604666171103123459
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 28, 2017 |
Publication Date | Nov 30, 2017 |
Deposit Date | Feb 4, 2018 |
Publicly Available Date | Oct 27, 2022 |
Journal | Current Microwave Chemistry |
Print ISSN | 2213-3356 |
Publisher | Bentham Science Publishers |
Peer Reviewed | Peer Reviewed |
Volume | 4 |
Issue | 4 |
Pages | 306-316 |
DOI | https://doi.org/10.2174/2213335604666171103123459 |
Keywords | Bioethanol; Enzymatic hydrolysis; Experimental design; Fermentable sugars; Lignocellulose; Microwave-assisted pre-treatment; Wheat straw |
Public URL | https://hull-repository.worktribe.com/output/481575 |
Publisher URL | http://www.eurekaselect.com/156781/article |
Contract Date | Feb 8, 2018 |
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Copyright Statement
©2018 The authors
This is the accepted version of an article published in Current Microwave Technology. The published version can be accessed at the DOI link above.