Comparison and optimization of different methods for Microcystis aeruginosa’s harvesting and the role of zeta potential on its efficiency

Abstract

This study has compared the harvesting efficiency of four flocculation methods, namely, induced by pH, FeCl 3 , AlCl 3 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 FeCl 3 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 FeCl 3 , which allowed reaching 92% in 4 h.

Optimization of the culture of Chlorella sorokiniana PA.91 by RSM: effect of temperature, light intensity, and MgAC-NPs

“…The intensity of light changes with the turn of day and night in natural conditions (Ruan et al 2021). Light requirements depend on species and are necessary for holding lipid synthesis; In overall, the light will obtain cell growth, biosynthesis of fatty acids, and formation of chloroplast membranes (Geada et al 2019). In the case of C.S PA.91 in wastewater, there is no study in writing on the effect of light in MgAC-NPs on microalgae growth.…”

Cyanobacterial Harmful Algal Blooms in Aquatic Ecosystems: A Comprehensive Outlook on Current and Emerging Mitigation and Control Approaches

“…Numerous methods have been developed and examined for the removal of floating toxic cyanobacteria, mostly Microcystis sp. by mechanical harvesting (see [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 ] and references therein). Examples from large-scale operations, including biomass micro-screening and flocculation–flotation, are shown in Figure 2 .…”