Removal of cyanobacterial blooms in Taihu Lake using local soils. II. Effective removal of Microcystis aeruginosa using local soils and sediments modified by chitosan.
After sepiolite was modified with Fe3+ to increase its surface charge, the initial algal removal rate increased significantly, but its Q8h was not improved substantially at clay loadings below 0.1 g/L. Modification on netting and bridging properties of clays by either chitosan or polyacrylamide (PAM) dramatically increased flocculation (Q8h) of MA cells in freshwaters. Algal removal efficiencies of different solids, including Type III clays, local soils and sediments, were all improved to a similar level of >90% at a total loading of 0.011 g/L (contained 0.001 g/L chitosan) after they were modified with chitosan, making the idea of clearing up algal blooms using local soils/sediments possible. The mechanism of netting and bridging was confirmed to be the most important factor in improving the removal efficiency of cells, whereas clays also played important roles in the sedimentation of the floc.
Zou
Hua
H
State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Pan
Gang
G
Chen
Hao
H
Yuan
Xianzheng
X
D000180:Acrylic Resins / Q000494:pharmacology; D000538:Aluminum Silicates; D000863:Antacids; D002614:Chelating Agents / Q000494:pharmacology*; D002681:China; D048271:Chitosan / Q000494:pharmacology*; D000077215:Clay; D005068:Eutrophication; D005427:Flocculation; D005618:Fresh Water / Q000382:microbiology*; D019015:Geologic Sediments; D017633:Magnesium Silicates; D046931:Microcystis; D008855:Microscopy, Electron, Scanning / Q000379:methods; D008903:Minerals; D012987:Soil; D000099166:Polyacrylamides
D000180:Acrylic Resins; D000538:Aluminum Silicates; D000863:Antacids; D002614:Chelating Agents; D048271:Chitosan; D000077215:Clay; D017633:Magnesium Silicates; D008903:Minerals; D012987:Soil; D000099166:Polyacrylamides; C001671:magnesium trisilicate