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

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

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.

Suggested Citation

  • Özbek, Hatice Neval & Koçak Yanık, Derya & Fadıloğlu, Sibel & Göğüş, Fahrettin, 2020. "Ultrasound-assisted alkaline pre-treatment and its sequential combination with microwave for fractionation of pistachio shell," Renewable Energy, Elsevier, vol. 157(C), pages 637-646.
    • Handle: RePEc:eee:renene:v:157:y:2020:i:c:p:637-646
    DOI: 10.1016/j.renene.2020.05.085
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    References listed on IDEAS

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    1. Cebreiros, Florencia & Clavijo, Leonardo & Boix, Elzeario & Ferrari, Mario Daniel & Lareo, Claudia, 2020. "Integrated valorization of eucalyptus sawdust within a biorefinery approach by autohydrolysis and organosolv pretreatments," Renewable Energy, Elsevier, vol. 149(C), pages 115-127.
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