Screening of commercial natural and synthetic cationic polymers for flocculation of freshwater and marine microalgae and effects of molecular weight and charge density

Harvesting Microalgal Biomass grown in Anaerobic Sewage Treatment Effluent by the Coagulation-Flocculation Method: Effect of pH

“…In a study to recover C. vulgaris and Nannochloropsis oculata, grown in synthetic medium with pH of 8, the removal efficiencies for C. vulgaris were 99, 100 and 100% for concentrations of 5, 15 and 45 mg/L, respectively. In contrast, N. oculata removal efficiencies were 92, 96 and 99% for concentrations of 5, 15 and 45 mg/L, respectively 30 .In this study, the effect of pH at the same low concentrations of modified tannin (5, 15 and 45 mg/L), the removal efficiencies were lower, between 30 and 60%. For pH values of approximately 8, the MBM recovery from a raceway pond, which treats wastewater, were greater than 90% by using 50 mg/L of Tanfloc ® SG 30 as the coagulant.…”

Dosage effect of cationic polymers on the flocculation efficiency of the marine microalga Neochloris oleoabundans

“…This is in accordance with both the experimental and simulated optimal dosage of 70 mg flocculant /g biomass , followed by a decrease in biomass recovery. This cost estimation is slightly higher than the evaluation reported in the screening study of Roselet et al (2015). In that screening, using the marine microalgae …”

Highly charged cellulose-based nanocrystals as flocculants for harvesting Chlorella vulgaris

“…Alloy-based nanoparticles, such as FePt, FePd and FeCo are more stable but they are currently only used in biomedical applications due to their high production costs (Lee et al, 2015). Biodegradable organic flocculants could offer an alternative, as was recently demonstrated for chitosan, cationic starch and tannins (Vandamme et al, 2010;Roselet et al, 2015). However, the efficiency of these types of flocculants tends to be very sensitive to ionic strength and the presence of algal organic matter (AOM) .…”