Modelling the influence of total suspended solids on E. coli removal in river water
| Autor: | Evelyn Walters, Jueying Qian, Michael Wagner, Harald Horn, Peter Rutschmann |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
Lysis genetic structures Sedimentation (water treatment) 0208 environmental biotechnology Indicator bacteria Portable water purification 02 engineering and technology 010501 environmental sciences Models Biological 01 natural sciences Water Purification Feces Rivers Escherichia coli 0105 earth and related environmental sciences Water Science and Technology Total suspended solids Chemistry 020801 environmental engineering Flume Models Chemical Environmental chemistry Combined sewer Particle size Water Microbiology |
| Zdroj: | Water Science and Technology. 73:1320-1332 |
| ISSN: | 1996-9732 0273-1223 |
| DOI: | 10.2166/wst.2015.605 |
| Popis: | Following sewer overflows, fecal indicator bacteria enter surface waters and may experience different lysis or growth processes. A 1D mathematical model was developed to predict total suspended solids (TSS) and Escherichia coli concentrations based on field measurements in a large-scale flume system simulating a combined sewer overflow. The removal mechanisms of natural inactivation, UV inactivation, and sedimentation were modelled. For the sedimentation process, one, two or three particle size classes were incorporated separately into the model. Moreover, the UV sensitivity coefficient α and natural inactivation coefficient kd were both formulated as functions of TSS concentration. It was observed that the E. coli removal was predicted more accurately by incorporating two particle size classes. However, addition of a third particle size class only improved the model slightly. When α and kd were allowed to vary with the TSS concentration, the model was able to predict E. coli fate and transport at different TSS concentrations accurately and flexibly. A sensitivity analysis revealed that the mechanisms of UV and natural inactivation were more influential at low TSS concentrations, whereas the sedimentation process became more important at elevated TSS concentrations. |
| Databáze: | OpenAIRE |
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