Journal
ENERGY
Volume 206, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.118184
Keywords
Microalgae; Oleaginous yeast; VFAs; Microbial oils; Digestate
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Funding
- Spanish Ministry of Economy and Competitiveness through the grants FEDER/Ministerio de Ciencia, Innovacion y Universidades Agencia Estatal de Investigacion [ENE2017-86864-C2-2-R, RYC-2014-16823]
- Community of Madrid [S2018/BAA-4532]
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This study assessed the potential of using microalgae anaerobic fermentation as a novel choice for producing microbial oils and biogas. Microalgae biomass (Chlorella vulgaris) was used for volatile fatty acids (VFAs) production at three organic loading rates (OLR = 6, 9, 12 g COD/Ld). Regardless of the OLR, anaerobic systems displayed similar organic matter conversion yields into VFAs (VFAs-COD/CODin = 38%) and VFAs distribution profiling. Obtained digestates were further used with a two-fold purpose, producing microbial oils from the VFA rich liquid fraction, and generating methane from the remaining solid spent. The yeast Yarrowia lipolytica was able to grow on VFAs concentration up to 17.6 g/L while the highest VFAs concentration (24.2 g/L, digestate obtained at 12 g COD/Ld) resulted inhibitory. Despite of that, Y. lipolytica exhibited remarkably high lipid content (15-23%) when grown in digestates. The three spent solid fractions (corresponding to the 3 OLRs) reached the same methane potential. (C) 2020 Elsevier Ltd. All rights reserved.
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