Sedimentation rate-based screening of oleaginous microalgae for utilization as a direct combustion fuel

[Display omitted] •Different cell sedimentation rate is effective for screening of oleaginous cells.•Mutant strains having low sedimentation rate shows high lipid content.•The isolated mutant strain had a 57.3% enhancement in lipid content.•High lipid content of isolated mutant strain contributes to...

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Bibliographic Details
Published in:Bioresource technology 2019-12, Vol.293, p.122045-122045, Article 122045
Main Authors: Sung, Young Joon, Patel, Anil Kumar, Yu, Byung Sun, Choi, Hong Il, Kim, Jongrae, Jin, EonSeon, Sim, Sang Jun
Format: Article
Language:English
Subjects:
Direct combustion fuel
High-lipid content strain
Microalgae
Sedimentation rate
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Summary:[Display omitted] •Different cell sedimentation rate is effective for screening of oleaginous cells.•Mutant strains having low sedimentation rate shows high lipid content.•The isolated mutant strain had a 57.3% enhancement in lipid content.•High lipid content of isolated mutant strain contributes to high LHV of biomass. The co-combustion of microalgae biomass with coal has the potential to significantly reduce CO2 emissions by eliminating expensive and carbon-emitting downstream processes. In this study, the utilization of microalgal biomass as a direct combustion fuel in co-firing industries and the screening of potential oleaginous strains of high calorific value was investigated. High-lipid accumulating mutants were selected from mutant mixtures based on cell density using differential sedimentation rates. Of the mutant strains obtained in the top phase of the separation medium, 72% showed a higher lipid content than the wild-type strain. One mutant strain exhibited a 57.3% enhanced lipid content and a 9.3% lower heating value (LHV), both indicators of direct combustion fuel performance, compared to the wild-type strain. Our findings indicate that sedimentation rate-based strain selection allows for the easy and rapid screening of high-lipid content algal strains for the use of microalgae as direct combustion fuels.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2019.122045