Comparison and optimization of different methods for Microcystis aeruginosa’s harvesting and the role of zeta potential on its efficiency
2019
Geada, Pedro | Oliveira, Francisca | Loureiro, Luís | Esteves, Diogo | Teixeira, José A. | Vasconcelos, Vítor | Vicente, António A. | Fernandes, Bruno D.
This study has compared the harvesting efficiency of four flocculation methods, namely, induced by pH, FeCl₃, AlCl₃ and chitosan. No changes were observed on M. aeruginosa cells. Flocculation assays performed at pH 3 and 4 have shown the best harvesting efficiency among the pH-induced tests, reaching values above 90% after 8 h. The adjustment of zeta potential (ZP) to values comprised between − 6.7 and − 20.7 mV enhanced significantly the settling rates using flocculant agents, being FeCl₃ the best example where increments up to 88% of harvesting efficiency were obtained. Although all the four methods tested have presented harvesting efficiencies above 91% within the first 8 h after the optimization process, the highest performance was obtained using 3.75 mg L⁻¹ of FeCl₃, which allowed reaching 92% in 4 h.
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