Storm water overflows are the main cause for temporary high levels of fecal bacteria in urban rivers. Furthermore, fecal bacteria may attach to and accumulate in benthic biofilms at the river sediment interface. In order to accurately assess the potential health risk after storm water overflows, knowledge of processes like inactivation, sedimentation, accumulation and growth of fecal bacteria in rivers is essential. The aim of the thesis presented was to examine the influence of sunlight intensity on the inactivation and accumulation of fecal bacteria in the bulk phase and the benthic biofilm. In addition, the effects of particle association and nutrient supply were investigated. Using the measured inactivation coefficients, a one-dimensional simulation showed very good agreement with the measured levels of fecal bacteria in the river Isar.
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Storm water overflows are the main cause for temporary high levels of fecal bacteria in urban rivers. Furthermore, fecal bacteria may attach to and accumulate in benthic biofilms at the river sediment interface. In order to accurately assess the potential health risk after storm water overflows, knowledge of processes like inactivation, sedimentation, accumulation and growth of fecal bacteria in rivers is essential. The aim of the thesis presented was to examine the influence of sunlight intensi...
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