Biofuels from Biowaste via a Hybrid Process

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Examensarbete för masterexamen
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2022
Författare
Dhakal, Prabin
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One of the main challenges the world is facing is global warming caused by greenhouse gas emissions, for which fossil fuels are responsible to a great extent. To combat this issue, there is a need to develop fuels from renewable sources. Food waste can be a potential source of such fuel. In this study, three different extraction techniques (soxhlet extraction, ultrasound -assisted extraction, and enzyme-assisted extraction) were conducted to characterize Renova’s food waste slurry. A new hybrid extraction method has been investigated to enhance the liquefaction, which successfully yielded the highest extracted liquid products. In addition, it investigates catalytic hydrotreatment of the extracted products was evaluated as a food waste valorization strategy to obtain biofuels. Compared to the three extraction methods, the liquefaction of food waste has been enhanced using the new hybrid extraction method while using ethanol as the solvent in wet conditions. The catalytic hydrotreatment of the extracted liquid and solid obtained from hybrid extraction method produced 87.9 wt% and 74.9 wt% of oil, 7.4 wt% and 13.4 wt% of solids and 7.1 wt% and 14.4 wt% of water respectively, with less than 0.5 wt% gas. Bio-oil from the extracted liquid product consists of 65.5 wt% of alkane-alkenes, 7.6 wt% of cyclic alkanes, 26.5 wt% of alcohol-ether and ketone compounds and less than 1 wt% of aromatics, naphthalenes, and alkylated phenols. Likewise, bio-oil from the extracted solid products consists of 75.6 wt% of alkane-alkenes, 3 wt% of cyclic alkanes, 15.3 wt% of alcohols and ethers 3.3 wt% of aromatics and naphthalenes and 2.8 wt% of alkylated phenols.
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Biofuels, Bio-oils, food waste, extraction, hybrid extraction.
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