Document Type

Article

Rights

Available under a Creative Commons Attribution Non-Commercial Share Alike 4.0 International Licence

Disciplines

1.3 PHYSICAL SCIENCES

Publication Details

Waste Management 105 (2020) 240–247

Abstract

This paper deals with the investigation of ultrasound (US) pretreatment of brewer’s spent grain (BSG) as ameans of releasing fermentable sugars, and the subsequent production of ethanol from this lignocellu-losic biomass. Using response surface methodology (RSM), the influence of US power, time, temperatureand biomass loading on fermentable sugar yield from BSG was studied. The optimal conditions werefound to be 20% US power, 60 min, 26.3°C, and 17.3% w/v of biomass in water. Under these conditions,an approximate 2.1-fold increase in reducing sugar yield (325 ± 6 mg/g of biomass) was achieved, relativeto untreated BSG (151.1 ± 10 mg/g of biomass). In contrast to acid or alkaline pretreatment approaches,the use of water obviated the need for neutralization for the recovery of sugars. The characterization ofnative and pretreated BSG was performed by HPLC, FTIR, SEM and DSC. Fermentation studies usingS.cerevisiaegrowing on pretreated BSG resulted in a conversion of 66% of the total sugar content inintoethanol with an ethanol content of 17.73 ± 2 g/ 100 g of pretreated BSG. These results suggest that ultra-sound pretreatment is a promising technology for increased valorization of BSG as a feedstock for produc-tion of bioethanol, and points ton the need for further work in this area

DOI

https://doi.org/10.1016/j.wasman.2020.02.012

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