Hydrodynamic cavitation for bacterial disinfection and medium recycling for sustainable Ettlia sp. cultivation

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Open cultivation systems are the most economic option for microalgal biomass production but their harvesting cost, bacterial invasion, and water usage are still deterring large-scale applications. Therefore, in this study, low-cost techniques for harvesting, bacterial disinfection, and medium recycling were sequentially implemented for Ettlia sp. For harvesting, the employed auto-flocculation harvested 96% of algae but was not able to remove bacteria that invaded during cultivation. For this reason, hydrodynamic treatment was applied as a bacterial disinfection method for medium recycling, and treated up to 100% of the bacteria in the supernatant. Afterward, the supernatant was replenished with nutrients and reused to grow microalgae. In medium-recycled cultivation, auto-flocculation recycled (AR) medium showed the highest final biomass concentration of 3.84 g L-1, while the centrifugation recycled (CR) medium and the fresh medium (FM) resulted in 3.78 and 3.67 g L-1, respectively. In addition, the lipid content of the AR group was highly increased to 20.4%, resulting in the highest lipid productivity of 0.11 g L-1 d(-1). Moreover, an analysis of fatty acid methyl ester compositions confirmed that 76.6% of lipid from the AR group were mainly composed of C16-C18, which are suitable for biodiesel. Consequently, the results showed that the implementation of low-cost techniques not only reduced process costs and water usage but also enhances both the biomass and lipid productivities of the species.
Publisher
ELSEVIER SCI LTD
Issue Date
2021-08
Language
English
Article Type
Article
Citation

JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, v.9, no.4

ISSN
2213-3437
DOI
10.1016/j.jece.2021.105411
URI
http://hdl.handle.net/10203/286754
Appears in Collection
CE-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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