Journal
BIORESOURCE TECHNOLOGY
Volume 323, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124640
Keywords
Biofuels; Circular economy; Optimization; Renewable energy; Waste recycling
Funding
- start-up funds for high-end talents of Chengdu University [2081920048]
- National Natural Science Foundation of China [NSFC11572057, NSFC11832007, 52050410328]
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This study evaluated in-situ co-transesterification of wet spent coffee ground (SCG)/microalgae mixture for enhanced biodiesel production. The optimum conditions for maximum biodiesel yield were found to be 198 degrees C, 6 mL solvent g(-1) biomass, and a reaction time of 132 min. Pure microalgae showed the highest biodiesel yield, while pure SCG showed the lowest yield.
This study evaluated in-situ co-transesterification of wet spent coffee ground (SCG)/microalgae mixture for enhanced biodiesel production. SCG and microalgae showed lipid contents of 16.0 and 23.6 wt%, respectively. A total of 27 transesterification runs were performed using wet SCG:algae (1:1, w/w) at different temperatures, times, and solvent ratios. Box-Behnken quadratic model suggested 198 degrees C, 6 mL solvent g(-1) biomass, and reaction time of 132 min as the optimum conditions for maximum biodiesel yield. At different SCG/microalgae blend ratios, pure microalgae showed the highest biodiesel yield of 20.15 wt%. Increase of SCG ratio resulted in significant reduction in the biodiesel yield, reaching the lowest value of 11.2 wt% using pure SCG. On the other hand, SCG showed better biodiesel characteristics than microalgae regarding iodine value, cetane number, and oxidation stability. The present results confirmed that SCG-algae blend results in dual effect of enhancing biodiesel yield and quality, comparing to the individual transesterification.
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