James Lawrence , Armando Oliva , Stefano Papirio , Jerry D. Murphy , Piet N.L. Lens
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引用次数: 0
摘要
咖啡消费会产生大量废咖啡渣(SCG)形式的废物,这是一种富含碳水化合物、蛋白质和多酚的木质纤维素材料。这种丰富的原料在生产生物燃料和增值产品方面前景广阔。本研究调查了碱性(NaOH)、超声波和静磁场等预处理对 SCG 生物转化在生物大分子释放、H2 电位和挥发性脂肪酸产生方面的影响。处理后,泥浆(固体和液体部分混合物)被用于不同挥发性固体(VS)浓度(23.3 和 46.7 g VS/L)的厌氧发酵试验。在 23.3 g VS/L 的浓度下,经碱处理的 SCG 泥浆的 H2 产量最高,达到 25 - 30 mL H2/g VS。然而,在使用碱处理的 46.7 g VS/L 泥浆时,由于在预处理和调节初始 pH 值时使用了过多的 NaOH 和化学品,H2 的产生受到了抑制。相比之下,增加 VS 浓度对挥发性脂肪酸的积累有积极影响,其中以乙酸(HAc)和己酸为主。当 VS 浓度为 46.7 克/升时,超声波预处理的 SCG 可达到 3260.0 毫克 HAceq/升。
Improving hydrogen and volatile fatty acids production through pretreatment of spent coffee grounds
Consumption of coffee produces large amounts of waste in the form of spent coffee grounds (SCG), a lignocellulosic material rich in carbohydrates, proteins, and polyphenols. This abundant feedstock is promising in terms of biofuels and value-added product generation. This study investigated the impact of pretreatments, such as alkaline (NaOH), ultrasound, and static magnetic field, on SCG bioconversion in terms of biomolecule release, H2 potential and volatile fatty acids production. Following treatment, the slurry (solid and liquid fraction mixture) was utilised in anaerobic fermentation tests at varying volatile solid (VS) concentrations (23.3 and 46.7 g VS/L). The highest H2 production range, 25 – 30 mL H2/g VS, was obtained using the alkaline-pretreated SCG slurry at 23.3 g VS/L. Nevertheless, inhibition of H2 production was observed when utilising the alkaline-pretreated slurry at 46.7 g VS/L owing to the excessive use of NaOH for pretreatment and chemicals to adjust the initial pH. In contrast, increasing the VS concentration had a positive impact on volatile fatty acids accumulation, with acetic (HAc) and caproic acid being dominant. Ultrasound-pretreated SCG achieved 3260.0 mg HAceq/L at a concentration of 46.7 g VS/L.
期刊介绍:
Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes.
Scope:
Addresses solid wastes in both industrialized and economically developing countries
Covers various types of solid wastes, including:
Municipal (e.g., residential, institutional, commercial, light industrial)
Agricultural
Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)