Influence of Algal Organic Matter on Algal Removal Efficiency by Flocculation of Modified Clay

Modified clay (MC) technology is the most effective method to control harmful algal blooms (HABs) and has been widely testified in many countries recent decades. Although dissolved organic matter (dAOM) found be abundant HAB-affected waters, little known about its effect on MC flocculation. Prorocentrum donghaiense was chosen as model organism this study. The flocculation of with different concentrations dAOM observed by particle image velocimeter, removal efficiency microalgae determined using a fluorometer. results showed that small amount resulted faster flocculation, larger flocs, higher floc strength better regeneration capacity, could reach 80%. However, large amounts produced during occurrence HABs inhibit MC, only 35%. Furthermore, increase dAOM, zeta potential particles decreases from 1.56 mV −18.9 mV, repulsive force between also increases. examination 18-angle laser light scattering gel permeation chromatography specific ultraviolet absorption (SUVA254) revealed some hydrophobic macromolecules preferred attach at tiny while concentration would inhibits reducing surface activity intergranular repulsion. According findings study, dosage must increased order obtain best MC.