Bacterial community enhances flocculation efficiency of Ettlia sp. by altering extracellular polymeric substances profile

Bioresource Technology
Chau Hai Thai VuHee-Mock Oh

Abstract

This study examined the effects of a bacterial community and extracellular polymeric substances (EPS) on Ettlia sp. flocculation. The growth rate, flocculation efficiency (FE), bacterial community, and EPS profile of axenic and xenic Ettlia cultures were monitored during 46 days of cultivation. For the xenic culture, with a great abundance of growth-promoting and flocculation-inducing bacteria, the biomass density was 18.75% higher and its FE reached 100% in the mid-stationary phase. Moreover, microscopic observation and a quantitative analysis of the EPS revealed the exclusive presence of long filamentous EPS and more compact structure in the xenic Ettlia culture, possibly explaining its better FE. Notwithstanding, for the axenic culture, despite a lower biomass density and reduced abundance of EPS, its FE reached 92.54% in the mid-stationary phase. Thus, the role of the bacterial community was found to be supportive rather than vital for the high settleability of the self-flocculating Ettlia microalgal culture.

Citations

Oct 15, 2020·International Journal of Systematic and Evolutionary Microbiology·Chan-Yeong ParkHee-Mock Oh
Mar 28, 2021·Bioresource Technology·Lijian LengHuajun Huang

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