title: Removal of cyanobacterial blooms in Taihu Lake using local soils. I. Equilibrium and kinetic screening on the flocculation of Microcystis aeruginosa using commercially available clays and minerals.
abstract: Algal removal abilities of 26 clays/minerals were classified into three categories according to the 8-h equilibrium removal efficiency (Q8h) and removal rate at a clay loading of 0.7 g/L. Type I clays (sepiolite, talc, ferric oxide, and kaolinite) had a Q8h > 90%, a t50 (time needed to remove 50% of the algae) < 15 min, and a t80 < 2.5 h. Type II clays (6 clays) had a Q8h 50-90%, a t50 < 2.5 h, and a t80 > 2.5 h. Type III clays (14 clays) with Q8h < 50%, t50 > 8 h and t80 > 14 h had no practical value in removal of algal blooms. When the clay loading was reduced to 0.2 g/L, Q8h for all the 25 materials decreased to below 60%, except for sepiolite whose Q8h remained about 97%. The high efficiency for sepiolite to flocculate M. aeruginosa cells in freshwaters was due to the mechanism of netting and bridging effect.
authors.affiliation: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. gpan@mail.rcees.ac.cn
authors.forename: Gang
authors.initials: G
authors.lastname: Pan
authors.forename: Ming-Ming
authors.initials: MM
authors.lastname: Zhang
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Hua
authors.initials: H
authors.lastname: Zou
authors.forename: Hai
authors.initials: H
authors.lastname: Yan
mesh_terms: D000538:Aluminum Silicates; D000863:Antacids; D002681:China; D000077215:Clay; D005068:Eutrophication; D005290:Ferric Compounds; D005427:Flocculation; D005618:Fresh Water / Q000382:microbiology*; D007616:Kaolin; D007700:Kinetics; D017633:Magnesium Silicates; D046931:Microcystis; D008903:Minerals; D012987:Soil; D013627:Talc
chemical_list: D000538:Aluminum Silicates; D000863:Antacids; D005290:Ferric Compounds; D017633:Magnesium Silicates; D008903:Minerals; D012987:Soil; D013627:Talc; C000499:ferric oxide; D007616:Kaolin; C001671:magnesium trisilicate; D000077215:Clay