Journal
WATER SCIENCE AND TECHNOLOGY
Volume 54, Issue 3, Pages 23-28Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2006.443
Keywords
drinking water; endotoxin; heterotrophic bacteria; microcystin; phytoplankton; removal
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The removal of cyanobacteria, hepatotoxins produced by them (microcystins), phytoplankton, heterotrophic bacteria and endotoxins were monitored at a surface water treatment plant with coagulation, clarification, sand filtration, ozonation, slow sand filtration and chlorination as the treatment process. Coagulation-sand filtration reduced microcystins by 1.2-2.4, and endotoxins by 0.72-2.0 log(10) units. Ozonation effectively removed the residual microcystins. The treatment process reduced phytoplankton biomass by 2.2-4.6 and heterotrophic bacteria by 2.0-5.0log(10) units. In treated water, the concentration of microcystins never exceeded the WHO guide value (1 mu g/L), but picoplankton and monad cells were often detected in high numbers. The heterotrophic bacterial isolates from the treated waters belonged to genera Sphingomonas, Pseudomonas, Bacillus, Herbaspirillum and Bosea.
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