Oliva A, Tan L C, Papirio S, Esposito G, Lens P N L
National University of Ireland Galway, Department of Microbiology and Ryan Institute, University Road, Galway, H91 TK33 Ireland.
University of Naples Federico II, Department of Civil, Architectural and Environmental Engineering, Via Claudio 21, 80125 Naples, Italy.
Biomass Convers Biorefin. 2024;14(10):11113-11130. doi: 10.1007/s13399-022-03173-x. Epub 2022 Aug 17.
Lignocellulosic residues (LRs) are one of the most abundant wastes produced worldwide. Nevertheless, unlocking the full energy potential from LRs for biofuel production is limited by their complex structure. This study investigated the effect of N-methylmorpholine N-oxide (NMMO) pretreatment on almond shell (AS), spent coffee grounds (SCG), and hazelnut skin (HS) to improve their bioconversion to methane. The pretreatment was performed using a 73% NMMO solution heated at 120 °C for 1, 3, and 5 h. The baseline methane productions achieved from raw AS, SCG, and HS were 54.7 (± 5.3), 337.4 (± 16.5), and 265.4 (± 10.4) mL CH/g VS, respectively. The NMMO pretreatment enhanced the methane potential of AS up to 58%, although no changes in chemical composition and external surface were observed after pretreatment. Opposite to this, pretreated SCG showed increased porosity (up to 63%) and a higher sugar percentage (up to 27%) after pretreatment despite failing to increase methane production. All pretreatment conditions were effective on HS, achieving the highest methane production of 400.4 (± 9.5) mL CH/g VS after 5 h pretreatment. The enhanced methane production was due to the increased sugar percentage (up to 112%), lignin removal (up to 29%), and loss of inhibitory compounds during the pretreatment. An energy assessment revealed that the NMMO pretreatment is an attractive technology to be implemented on an industrial scale for energy recovery from HS residues.
The online version contains supplementary material available at 10.1007/s13399-022-03173-x.
木质纤维素残渣（LRs）是全球产生量最大的废弃物之一。然而，由于其结构复杂，限制了从LRs中充分挖掘生物燃料生产的能源潜力。本研究调查了N-甲基吗啉-N-氧化物（NMMO）预处理对杏仁壳（AS）、咖啡渣（SCG）和榛子皮（HS）的影响，以提高它们向甲烷的生物转化效率。预处理采用73%的NMMO溶液，在120℃下加热1、3和5小时。未经处理的AS、SCG和HS的基准甲烷产量分别为54.7（±5.3）、337.4（±16.5）和265.4（±10.4）mL CH₄/g VS。NMMO预处理使AS的甲烷潜力提高了58%，尽管预处理后未观察到化学成分和外表面的变化。与此相反，预处理后的SCG尽管甲烷产量未增加，但孔隙率增加（高达63%），预处理后糖含量更高（高达27%）。所有预处理条件对HS均有效，预处理5小时后甲烷产量最高达到400.4（±9.5）mL CH₄/g VS。甲烷产量的提高归因于预处理过程中糖含量增加（高达112%）、木质素去除（高达29%）以及抑制性化合物的损失。能源评估表明，NMMO预处理是一种有吸引力的技术，可在工业规模上用于从HS残渣中回收能源。
在线版本包含可在10.1007/s13399-022-03173-x获取的补充材料。
