COMPARATIVE PERFORMANCE OF DIFFERENT FLOCCULANTS IN THE RECOVERY OF SCENEDESMUS OBLIQUUS BIOMASS WITH LIPID QUANTIFICATION
DOI:
https://doi.org/10.56238/levv16n53-138Keywords:
Algal Biomass, Bioenergy, Flocculant, LipidsAbstract
To evaluate the recovery of algal biomass in different harvesting methods of the microalgae Scenedesmus obliquus, using chemical and natural flocculating agents. The experiment was conducted in triplicate, evaluating five flocculating agents, three of which were chemical (sodium hydroxide, ferric chloride, and ferric sulfate) and two of which were natural (chitosan and Moringa oleifera). Flocculation efficiency, biomass recovery yield, and, subsequently, the lipid content (%) of the recovered biomass were analyzed in an integrated manner. In flocculation efficiency tests with 24 hours of interaction, all flocculants evaluated showed efficiency above 90%, demonstrating the effectiveness of the different agents. Biomass yield ranged from 0.157 g/L to 0.245 g/L, with the highest values observed in treatments with metallic salts. Regarding lipid content, chemical flocculants presented yields of 5.0% to 6.0%, while natural flocculants (Moringa oleifera and chitosan) provided higher levels, ranging from 7.6% to 11%. All flocculating agents evaluated demonstrated high efficiency in recovering algal biomass, with rates exceeding 90%, confirming the effectiveness of both chemical and natural flocculants. Among them, ferric sulfate stood out for presenting the highest biomass yield. On the other hand, the highest lipid content was observed in the biomass recovered by natural flocculants such as chitosan and M. oleifera, suggesting that these natural agents not only enable efficient recovery but also better preserve bioactive components.
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