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.
Dr Vicky Skoulou V.Skoulou@hull.ac.uk
Graduate Research Director (GRD) of School of Engineering ; Senior Lecturer (Assoc. Prof.) in Chemical Engineering-Bioenergy ; PI of the B3: Biomass Waste- BioenergH2- Biochars Challenge Group of PGRs and PDRAs
Dr Sharif Zein S.H.Zein@hull.ac.uk
Senior Fellow HEA| Reader in Biorefinery Processes and Reaction Engineering| PI of Bioref Group
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.
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|
|Publisher||Bentham Science Publishers|
|Peer Reviewed||Peer Reviewed|
|Keywords||Bioethanol; Enzymatic hydrolysis; Experimental design; Fermentable sugars; Lignocellulose; Microwave-assisted pre-treatment; Wheat straw|
©2018 The authors<br /> <br /> This is the accepted version of an article published in Current Microwave Technology. The published version can be accessed at the DOI link above.
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