Effect of Solvent Extraction Parameters on the Recovery of Oil From Spent Coffee Grounds for Biofuel Production
| Autor: | Ben Mills-Lamptey, Nicos Ladommatos, Ioannis Efthymiopoulos, Arthur Kay, Paul Hellier |
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| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Solvent extraction Environmental Engineering 020209 energy Coffee lipids 02 engineering and technology Raw material Free fatty acids 01 natural sciences 7. Clean energy Dry weight 010608 biotechnology 0202 electrical engineering electronic engineering information engineering Spent coffee grounds Waste Management and Disposal Water content chemistry.chemical_classification Original Paper Waste management Renewable Energy Sustainability and the Environment Chemistry Extraction (chemistry) Fatty acid Pulp and paper industry Pilot plant Fatty acid profile Biofuel Yield (chemistry) Biodiesel |
| Zdroj: | Waste and Biomass Valorization |
| ISSN: | 1877-265X 1877-2641 |
| DOI: | 10.1007/s12649-017-0061-4 |
| Popis: | Spent coffee grounds (SCG) are a potentially valuable source of lipids for sustainable production of biofuels. However, there are several feedstock properties and solvent extraction parameters that can impact on the oil yield and quality, potentially reducing the possible environmental benefits of deriving oils from this waste stream. This study presents results of laboratory and pilot plant scale experimental investigations into lipid recovery from spent coffee, determining the effects of solvent extraction variables including duration, SCG-to-solvent ratio and SCG residual moisture. SCG samples from both the industrial production of instant coffee and retail coffee shops were characterized in terms of moisture content, particle size distribution and oil content to identify the impact of these variables on the efficiency of lipid recovery by solvent extraction. The dry weight oil content of the instant SCG samples ranged from 24.2 to 30.4% w/w, while the retail SCG samples contained considerably lower amounts of lipids with their oil content ranging between 13.4 and 14.8% w/w. The highest oil yields were found at an extraction duration of 8 h, while a moisture content of ~2% w/w led to increased yields relative to completely dry samples. A pattern of increasing acidity with decreasing extraction duration was observed, suggesting preferential extraction of free fatty acids (FFA), with the fatty acid (FA) profile of the oil found to be similar to lipids commonly utilized for biofuel production. |
| Databáze: | OpenAIRE |
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