Green solvent extraction of lipids from spent coffee grounds: A computational fluid dynamics approach

IF 5.6 1区农林科学 Q1 AGRICULTURAL ENGINEERING

Industrial Crops and Products Pub Date : 2025-05-27 DOI:10.1016/j.indcrop.2025.121271

Riffat Amna, Ahmed F. Faheem

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引用次数: 0

Abstract

Background

The rising production of food waste presents significant environmental and economic challenges worldwide. This study investigates the valorization of food waste, specifically focusing on spent coffee grounds, by extracting lipids using environmentally friendly solvents for biodiesel production.

Method

We developed and experimentally validated a comprehensive computational fluid dynamics (CFD) model to optimize the lipid extraction process. The model examines the impact of solvent velocity, inlet temperatures, and material bed thickness on extraction efficiency.

Significant findings

Our study shows that increasing solvent velocity enhances lipid recovery by 45 % due to improved mass transfer. Ethanol yielded the highest extraction efficiency (26.2 %), followed by ethyl acetate (24.9 %) and hexane (21.2 %) at 0.0004 m/s and 25°C. Lipid extraction improved with temperature, reaching 30 % at 40°C and 40 mm bed thickness. Under optimal conditions (0.0004 m/s, 40°C, 40 mm), ethanol achieved a peak extraction of 38 %. These findings highlight the potential of spent coffee grounds for biodiesel production and the effectiveness of ethanol in sustainable lipid recovery.

Abstract Image

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用绿色溶剂从废咖啡渣中提取脂质：计算流体动力学方法

不断增加的食物浪费给世界各地带来了重大的环境和经济挑战。本研究调查了食物垃圾的价值，特别是关注用过的咖啡渣，通过使用环保溶剂提取脂质来生产生物柴油。方法建立综合计算流体动力学（CFD）模型并进行实验验证，以优化油脂提取工艺。该模型考察了溶剂速度、入口温度和物料床厚度对萃取效率的影响。sour研究表明，提高溶剂流速可提高45 %的脂质回收率，这是由于质传递的改善。在0.0004 m/s和25°C条件下，乙醇的提取率最高（26.2 %），其次是乙酸乙酯（24.9 %）和己烷（21.2 %）。脂质提取率随温度的升高而提高，在40℃、40 mm床层厚度下可达30 %。在最佳条件（0.0004 m/s, 40℃，40 mm）下，乙醇的提取率达到38% %。这些发现突出了废咖啡渣生产生物柴油的潜力和乙醇在可持续脂质回收中的有效性。

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来源期刊

Industrial Crops and Products 农林科学-农业工程

CiteScore

9.50

自引率

8.50%

发文量

1518

审稿时长

43 days

期刊介绍： Industrial Crops and Products is an International Journal publishing academic and industrial research on industrial (defined as non-food/non-feed) crops and products. Papers concern both crop-oriented and bio-based materials from crops-oriented research, and should be of interest to an international audience, hypothesis driven, and where comparisons are made statistics performed.