FeCl and polyacrylamide (PAM) had been used to investigate the effect of coagulation, flocculation, and their combination on algae cells and extracellular organic matter (EOM) at different phases. PAM tended to aggregate particle-like substances, while FeCl could interact with EOM. The content of EOM kept rising during the algae growth cycle, while OD peaked at about 3.0. At stationary phase Ⅰ, the removal efficiencies of UV, turbidity and OD of the suspension conditioned with FeCl + PAM reached (88.08 ± 0.89)%, (89.72 ± 0.36)% and (93.99 ± 0.05)%, respectively. Nevertheless, PAM + FeCl exhibited the worst efficiency because of the release of EOM caused by the turbulence. The results suggested that algal cells served as a coagulation aid to facilitate floc formation, while excessive EOM deteriorated harvesting performance. The process of FeCl + PAM at stationary phase Ⅰ appears to be a promising technology for microalgae harvesting.
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