Journal
ENVIRONMENTAL POLLUTION
Volume 141, Issue 2, Pages 206-212Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2005.08.047
Keywords
harmful cyanobacterial blooms; clays; chitosan-modified clays; flocculation; ionic strength; organic content; pH; cell concentration; growth stage
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Effects of ionic strength, pH, organic content, cell concentration, and growth phase on the removal of MA. cells using chitosan-modified sepiolite were Studied in the laboratory. The MA removal efficiency increased with the increase of salinity for normal clay flocculation. In contrast, for chitosan-modified clays/soils, MA removal efficiency increased with the decrease of salinity. The removal efficiency of chitosan-modified sepiolite was not significantly affected by pH (6-9), but dropped dramatically beyond pH 10. Humic acid had a small negative effect on the removal of MA cells. Cells were removed more effectively by clays around the early senescence growth phase than other growth stages. The removal efficiency increased as the cell concentration increased. In a field enclosure of Taihu Lake, a loading of 0.025 g/L chitosan-modified local soils removed 99% algal cells and no increase of chlorophyll-a was observed during the following one month's monitoring process. (c) 2005 Elsevier Ltd. All rights reserved.
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