Application of optimized alkaline pretreatment for enhancing the anaerobic digestion of different sunflower stalks varieties

Environmental Technology
Florian MonlauHélène Carrere

Abstract

The use of lignocellulosic residues such as sunflower stalks (SS) for the production of bioenergy such as methane is a promising alternative to fossil fuels. However, their recalcitrant structure justifies the use of pretreatment to enhance the accessibility of holocelluloses and their further conversion into methane. First, different conditions of alkaline pretreatment (i.e. duration and NaOH concentration (g/100 g TS) at a fixed temperature of 55 degrees C) were tested to enhance the methane potential of the stalks of the Serin sunflower (193 mL of methane per gram of volatile solids (VS)). The greatest improvement to the methane potential (262 mL CH4 g(-1) VS) was observed at 55 degrees C, 24 h, 4 g NaOH/100 g TS. Fourier Transform Infrared spectra highlighted an accumulation of lignin in the digestate and the degradation of holocelluloses during the anaerobic process, both for pretreated and untreated SS. In a second stage, this optimum condition for alkaline pretreatment (55 degrees C, 24 h, 4 g NaOH/100 g TS) was applied to the stalks of three other varieties of sunflower. Alkaline pretreatment was effective in the delignification of the stalks of the different sunflower varieties, with lignin reduction varying from 23.3%...Continue Reading

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Citations

Jun 25, 2014·Environmental Technology·Beatriz Molinuevo-SalcesHinrich Uellendahl
Jan 8, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Marinela ZhurkaKaterina Stamatelatou
Mar 22, 2021·Bioresource Technology·C Van VlierbergheH Carrere

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