Alternative Fuels Research Laboratory (AFRL), Energy Division, Department of Mechanical Engineering, Faculty of Engineering, Erciyes University, 38039, Kayseri, Turkey.
Department of Chemical and Materials Engineering, King Abdulaziz University, Rabigh, Saudi Arabia.
Chemosphere. 2022 Jan;286(Pt 2):131730. doi: 10.1016/j.chemosphere.2021.131730. Epub 2021 Jul 30.
Coffee is a globally consumed beverage that produces a substantial amount of valuable organic waste known as spent coffee grounds (SCG). Although SCG is a non-edible biomass, research initiatives focused on valorizing/utilizing its organic content, protecting the environment, and reducing the high oxygen demand required for its natural degradation. The integration with biorefinery in general and with pyrolysis process in specific is considerered the most successful solid waste management strategy of SCG that produce energy and high-value products. This paper aims at providing a quantitative analysis and discussion of research work done over the last 20 years on SCG as a feedstock in the circular bioeconomy (CBE). Management stratigies of SCG have been thoroughly reviewed and pyrolysis process has been explored as a novel technology in CBE. Results revealed that explored articles belong to Chemical, physical., biological and environmental science branches, with Energy & Fuels as the most reporting themes. Published works correlate SCG to renewable energy, biofuel, and bio-oil, with pyrolysis as a potential valorization approach. Literature review showed that only one study focused on the pyrolysis of defatted spent coffee grounds (DSCG). The insightful conclusions of this paper could assist in proposing several paths to more economically valorization of SCG through biorefinery, where extracted oil can be converted to biofuels or value-added goods. It was highlighted the importance of focusing on the coupling of SCG with CBE as solid waste managment strategy.
咖啡是一种全球范围内消费的饮料，会产生大量有价值的有机废物，即咖啡渣（SCG）。尽管 SCG 是一种不可食用的生物质，但研究人员致力于利用其有机成分的价值、保护环境并减少其自然降解所需的高耗氧量。将其与生物炼制厂，特别是与热解工艺相结合，被认为是 SCG 的最成功的固体废物管理策略，可以生产能源和高价值产品。本文旨在对过去 20 年来以 SCG 为原料的循环生物经济（CBE）研究工作进行定量分析和讨论。彻底审查了 SCG 的管理策略，并探索了热解工艺作为 CBE 中的一项新技术。结果表明，所探索的文章属于化学、物理、生物和环境科学分支，以能源与燃料为最主要的报告主题。已发表的作品将 SCG 与可再生能源、生物燃料和生物油联系起来，将热解作为一种潜在的增值方法。文献综述表明，只有一项研究专注于脱脂咖啡渣（DSCG）的热解。本文的深刻结论可以帮助提出通过生物炼制厂更经济地利用 SCG 的几种途径，从 SCG 中提取的油可以转化为生物燃料或高附加值产品。强调了将 SCG 与 CBE 作为固体废物管理策略相结合的重要性。
