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Title 

Microalgae-associated bacteria play a key role in the flocculation of Chlorella vulgaris

Authors 

Jimin LeeDae-Hyun ChoR RamananByung-Hyuk KimHee-Mock OhHee-Sik Kim

Publisher 

Elsevier

Issue Date 

2013

Citation 

Bioresource Technology, vol. 131, no. 0, pp. 195-201

Keywords 

AlgaeChlorella vulgarisFlocculationMicroalgae-associated bacteria

Abstract 

Flocculation is most preferred method for harvesting microalgae, however, the role of bacteria in microalgal flocculation process is still unknown. This study proves that bacteria play a profound role in flocculating by increasing the floc size resulting in sedimentation of microalgae. A flocculating activity of 94% was achieved with xenic Chlorella vulgaris culture as compared to 2% achieved with axenic culture. Denaturing gradient gel electrophoresis (DGGE) analysis of 16S rRNA gene of xenic C. vulgaris culture revealed the presence of Flavobacterium sp., Terrimonas sp., Sphingobacterium sp., Rhizobium sp. and Hyphomonas sp. as microalgae-associated bacteria. However when Flavobacterium, Terrimonas, Sphingobacterium were eliminated by fluorescence activated cell sorter (FACS), flocculating activity reduced to 3%. Further studies with cell free extracts also suggest that bacterial extracellular substances might also have a role in enhancing flocculation. We conclude that the collective presence of certain bacteria is the determining factor in flocculation of C. vulgaris.

ISSN 

0960-8524

Link 

http://dx.doi.org/10.1016/j.biortech.2012.11.130

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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