Ultrasound-assisted alkaline pre-treatment and its sequential combination with microwave for fractionation of pistachio shell

Hatice Neval Özbek, Derya Koçak Yanık, Sibel Fadıloğlu and Fahrettin Göğüş

Renewable Energy, 2020, vol. 157, issue C, 637-646

Abstract: Ultrasound-assisted alkaline pre-treatment (UAAP) and its sequential combination with microwave (SUMAAP) were performed for fractionation of pistachio shell and compared with conventional alkaline pre-treatment (CAP). The pre-treatment conditions were investigated and optimized using Box-Behnken design for maximum hemicellulose and cellulose recoveries. Under optimum conditions, the hemicellulose and cellulose recoveries were 57.67% and 94.05% for UAAP and 66.14% and 90.78% for SUMAAP, while these values were 16.28% and 98.70% after CAP, respectively. The compositional analysis showed that the xylo-oligosaccharides were the main components in liquid phases, while the solid phases were enriched in cellulose. Furthermore, a significant increase in enzymatic hydrolysis yield of pre-treated solids was obtained compared to the raw pistachio shell. Thus, the UAAP was proved to be a reliable and efficient process for pistachio shell pre-treatment and its sequential combination with microwave provide further increase in pre-treatment efficiency while reducing the processing time and alkali requirement.

Keywords: Pistachio shell; Ultrasound pre-treatment; Box-behnken design; Xylo-oligosaccharides; Enzymatic hydrolysis (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:157:y:2020:i:c:p:637-646

DOI: 10.1016/j.renene.2020.05.085

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