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<p>Phenolic-and oil-free spent coffee grounds (SCG) were subjected to air plasma treatment within an advanced biorefinery concept for the simultaneous exploitation of fermentable sugars, protein, and lignin. A non-thermal plasma microbubble reactor was employed to compare the pretreatment efficiency of submerged plasma-treated SCG to plasma-activated water (PAW)-treated SCG, considering sugar production after enzymatic hydrolysis. Submerged plasma pretreatment at 200&#xa0;V, 2.5 vvm and 60&#xa0;min resulted in 82.6% and 29.1% overall conversion yields for glucan and hemicellulose. PAW supplemented with HNO<sub>3</sub> enhanced its acidity, resulting in 36.6% higher glucan (92.7%) and 58.6% higher hemicellulose (38.8%) conversion yields than PAW alone (67.8% glucan and 24.5% hemicellulose conversion yields). Combined submerged plasma and PAW treatments resulted in 97% glucan and 32.6% hemicellulose conversion yields. Τhe utilization of SCG hydrolysates, produced via either submerged plasma or combined submerged plasma and PAW treatment, in <i>Cryptococcus curvatus</i> shake flask cultures resulted in higher microbial oil content (up to 51%) than alkaline treated SCG. Besides microbial oil production from the polysaccharide fraction, the proposed submerged plasma-based biorefinery could also exploit the 130.8&#xa0;g protein and 176.7&#xa0;g lignin present in the remaining solids. This study demonstrates that plasma bubbles could lead to holistic SCG valorization, thus enhancing overall resource efficiency.</p>

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Application of Novel Electrochemical Methods on Lignocellulosic Biomass for Enhanced Pretreatment and Microbial Oil Production

  • 期刊论文

  • 发表日期：

    2025年11月5日

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  • Evanthia Georgiadou,
  • Nikos Giannakis,
  • Sofia Maria Ioannidou,
  • Apostolis Koutinas,
  • Eleni Stylianou

摘要

Phenolic-and oil-free spent coffee grounds (SCG) were subjected to air plasma treatment within an advanced biorefinery concept for the simultaneous exploitation of fermentable sugars, protein, and lignin. A non-thermal plasma microbubble reactor was employed to compare the pretreatment efficiency of submerged plasma-treated SCG to plasma-activated water (PAW)-treated SCG, considering sugar production after enzymatic hydrolysis. Submerged plasma pretreatment at 200 V, 2.5 vvm and 60 min resulted in 82.6% and 29.1% overall conversion yields for glucan and hemicellulose. PAW supplemented with HNO3 enhanced its acidity, resulting in 36.6% higher glucan (92.7%) and 58.6% higher hemicellulose (38.8%) conversion yields than PAW alone (67.8% glucan and 24.5% hemicellulose conversion yields). Combined submerged plasma and PAW treatments resulted in 97% glucan and 32.6% hemicellulose conversion yields. Τhe utilization of SCG hydrolysates, produced via either submerged plasma or combined submerged plasma and PAW treatment, in Cryptococcus curvatus shake flask cultures resulted in higher microbial oil content (up to 51%) than alkaline treated SCG. Besides microbial oil production from the polysaccharide fraction, the proposed submerged plasma-based biorefinery could also exploit the 130.8 g protein and 176.7 g lignin present in the remaining solids. This study demonstrates that plasma bubbles could lead to holistic SCG valorization, thus enhancing overall resource efficiency.