Flocculation efficiency of microalgae Selenastrum bibraianum BPR1107 by flocculants
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Abstract
Microalgae biomass can be harvested in several methods for oil extraction and biodiesel production. This study was investigated the green microalgae Selenastrum bibraianum BPR1107 using chemicals to achieve coagulation and flocculation processes. Three chemical flocculants (i.e., aluminium sulphate, ferric chloride and polyaluminium chloride) were evaluated for their flocculation efficiency. The results were showed that polyaluminium chloride provided a maximum flocculation efficiency of 99.87±0.12 percent at 0.21 g/L in sedimental time of 60 minutes. The different initial concentration of microalgae culture affected the optimum flocculant dose and flocculation efficiency. In addition, excessive or less use of flocculant dose resulted in a decrease of flocculation efficiency. Therefore, the correlation between each dose of flocculants and OD680 expressed by optimal dose of polyaluminium chloride (g/L)=0.4202OD680-0.0004 (R2=1). The optimal dose was estimated from this function, indicating the flocculation efficiency was more than 99 percent in all studied concentrations of microalgae culture.
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Published manuscript are the rights of their original owners and RMUTSB Academic Journal. The manuscript content belongs to the authors' idea, it is not the opinion of the journal's committee and not the responsibility of Rajamangala University of Technology Suvarnabhumi
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