Ozone treatment of the raw water results in strong bacterial growth in the rapid sand filters during the winter months at Zurich's lake-water treatment plants. The source of the assimilable organic carbon (AOC) needed for this growth is not known. Evidence is provided that AOC is generated by ozone treatment of cyanobacteria present in the raw water which are disrupted during ozonation. Firstly, bacterial growth correlates with the presence of cyanobacteria at the intake during the winter months and secondly, the quantification of specific phytoplankton pigments, as a parameter for intact biomass, suggests that cells of cyanobacteria are readily disrupted by ozone treatment whereas other phytoplankton cells, such as diatoms, are more resistant to ozone. It is proposed that the released cellular content of phytoplankton provides the AOC source for bacterial growth.
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August 2003
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
August 01 2003
Influence of ozonated cyanobacteria on bacterial growth in rapid sand filters
Kezhen Cao Müller;
1Wasserversorgung Zurich, Hardhof 9, P.O. Box, CH-8023 Zurich, Switzerland
Tel: +41 1 435 24 75 Fax: +41 1 435 25 57; E-mail: [email protected]
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Richard Forster;
Richard Forster
1Wasserversorgung Zurich, Hardhof 9, P.O. Box, CH-8023 Zurich, Switzerland
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Sonja Gammeter;
Sonja Gammeter
1Wasserversorgung Zurich, Hardhof 9, P.O. Box, CH-8023 Zurich, Switzerland
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Beate Hambsch
Beate Hambsch
2Technologiezentrum Wasser (TZW), Karlsruher Strasse 84, D-76139 Karlsruhe, Germany
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Journal of Water Supply: Research and Technology-Aqua (2003) 52 (5): 333–340.
Citation
Kezhen Cao Müller, Richard Forster, Sonja Gammeter, Beate Hambsch; Influence of ozonated cyanobacteria on bacterial growth in rapid sand filters. Journal of Water Supply: Research and Technology-Aqua 1 August 2003; 52 (5): 333–340. doi: https://doi.org/10.2166/aqua.2003.0031
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