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

Kim, Minsik; Kim, Donghyun; Cho, Jun Muk; Nam, Kibok; Lee, Hansol; Nayak, Manoranjan; Han, Jong-In; Oh, Hee-Mock; Chang, Yong Keun

doi:10.1016/j.jece.2021.105411

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

Journal of environmental chemical engineering, v.9 no.4, 2021년, pp.105411 -

Kim, Minsik (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST)) , Kim, Donghyun (Department of Chemical Engineering, King Fahd University of Petroleum & Minerals) , Cho, Jun Muk (Clean Air Center, Korea Institute of Science and Technology (KIST)) , Nam, Kibok (Advanced Biomass R&D Center) , Lee, Hansol (Advanced Biomass R&D Center) , Nayak, Manoranjan (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST)) , Han, Jong-In (Department of Civil and Environmental Engineering, KAIST) , Oh, Hee-Mock (Cell Factory Research Center, Korea Research Institute of Bioscience and Bioengineering (KRIBB)) , Chang, Yong Keun (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technolo)

Abstract ▼ AI-Helper

Abstract 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. Highlights Low-cost harvesting, bacteria control, and medium recycling were combined. Auto-flocculation harvested microalgae but left bacteria in the supernatant. Hydrodynamic cavitation disinfected bacteria with low-energy consumption. Biomass productivity of auto-flocculation recycled medium was slightly increased. Auto-flocculation recycled medium resulted in 1.6-fold higher lipid productivity. Graphical Abstract [DISPLAY OMISSION]

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