title: [Effect of growth phase on the flocculation of algal cells using clays].
abstract: Four different growth phases, late lag phase, middle logarithmic phase, late logarithmic phase and early senescence phase of Microcystis aeruginosa 469 were studied for their surface hydrophobicity (xylene-water system) and surface charge (Zeta potential), followed by flocculation tests with sepiolite of 0.2 g/L. The results showed that the values of hydrophobicity were 64%, 48%, 58% and 70%, and the algal removal efficiencies after 60 min were 97%, 87%, 81% and 99% respectively, indicating a good relationship between surface hydrophobicity and removal efficiency (R = 0.7-0.8), but not the surface charge. Surface hydrophobicity and removal efficiency for the algal cells of Microcystis aeruginosa both varied with growth phase in a sequence of senescence phase > lag phase > logarithmic phase.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Gang
authors.initials: G
authors.lastname: Pan
authors.forename: Ming-ming
authors.initials: MM
authors.lastname: Zhang
mesh_terms: D000538:Aluminum Silicates; D000077215:Clay; D056890:Eukaryota / Q000254:growth & development*; D005068:Eutrophication; D005427:Flocculation; D046931:Microcystis / Q000254:growth & development*; D014873:Water Pollutants / Q000032:analysis
chemical_list: D000538:Aluminum Silicates; D014873:Water Pollutants; D000077215:Clay