Efficiency of various flocculants in harvesting the green microalgae Tetraselmis tetrahele (Chlorodendrophyceae: Chlorodendraceae)
Journal Title: Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society - Year 2012, Vol 5, Issue 4
Abstract
This study showed the efficiency of various compounds in flocculating cultures of the microalgae Tetraselmis tetrahele (G. S. West, 1916) for use as potential biodiesel feedstock. Of the five flocculants tested, NaOH and Al2(SO4)3 at concentrations of 200 mgL-1showed the highest (p<0.05) flocculating efficiencies at 96.15% and 98.65%, respectively. In terms settling time, Al2(SO4)3 at concentrations of 150 and 200 mgL-1 showed the fastest reactions reaching stable algal flocs only 1 hour after the addition of flocculants. Microscopic examination of resulting flocs showed no signs of cell plasmolysis or structural damage to cell walls for all treatments. Although significant (p<0.05) changes in pH of the resulting supernatant were observed for all treatments, these still fell within the suitable range for algal culture indicating the possibility of reusing the waste water for further cultures.
Authors and Affiliations
Victor Ferriols, Riza Aguilar
Keywords
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