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Title 

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

Authors 

Chau Hai Thai VuSeong-Jun ChunSeong-Hyun SeoYingshun CuiChi-Yong AhnHee-Mock Oh

Publisher 

Elsevier

Issue Date 

2019

Citation 

Bioresource Technology

Keywords 

BacteriaEttlia sp. YC001Extracellular polymeric substances (EPS)FlocculationMicroalgae

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.

URI 

https://doi.org/10.1016/j.biortech.2019.02.062

ISSN 

0960-8524

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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