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

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/100g TS) at a fixed temperature of 55 degrees C) were tested to enhance the methane potential of the stalks of the Serin sunflower (193mL of methane per gram of volatile solids (VS)). The greatest improvement to the methane potential (262mL CH(4)g(-1) VS) was observed at 55 degrees C, 24h, 4g NaOH/100g 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, 24h, 4g NaOH/100g 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% to 36.3% VS. This reduction of lignin was concomitant with the enhancement of methane potential as compared to that of raw SS, with an increase ranging from 29% to 44% for the different SS.
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Submitted on : Friday, May 29, 2020 - 8:57:47 AM
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Florian Monlau, Quentin Aemig, Abdellatif Barakat, Jean-Philippe Steyer, Hélène Carrère. Application of optimized alkaline pretreatment for enhancing the anaerobic digestion of different sunflower stalks varieties. Environmental Technology, Taylor & Francis: STM, Behavioural Science and Public Health Titles, 2013, 34 (13-14), pp.2155 - 2162. ⟨10.1080/09593330.2013.808247⟩. ⟨hal-02648155⟩

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