Journal article
First flush of dissolved compounds
- Krebs, Peter Institute for Urban Water Management, Dresden Univ. of Technol., D-01062 Dresden, Germany
- Holzer, Peter Seminar für Statistk, Swiss Federal Institute of Technology, CH-8092 Zürich, Switzerland
- Huisman, Jacco L. EAWAG, Überlandstrasse 133, CH-8600 Dübendorf, Switzerland
- Rauch, Wolfgang Dept. Envir. Sci. and Engrg., DTU, Building 115, DK-2800 Lyngby, Denmark
Published in:
- Water Science and Technology. - IWA Publishing. - 1999, vol. 39, no. 9, p. 55-62
English
In a crude conceptual approach it is commonly assumed that in a combined sewer system the concentration of dissolved compounds in diluted by an increasing flow rate due to rainwater inflow. However, theory of hydraulics suggests that these compounds are influenced by hydrodynamic effects. It is known that since the wave celerity is higher than the flow velocity of the water, the increase of flow rate induced through rain runoff is recognised earlier at a certain downstream section of the combined sewer than the concentration increase of typical rain-water compounds originating from surface wash-off. This description implies that the wave front is formed from the fluid that was present in the sewer before the flow rate increased, that is the sewage! By means of measurements and numerical simulations, it is shown that this effect may cause a significant impact of dissolved compounds on the receiving water, when a combined sewer overflow occurs, and also on the wastewater treatment plant when the sewer network is flat and catchment area is big.
- Language
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- English
- Open access status
- closed
- Identifiers
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- DOI 10.2166/wst.1999.0441
- ISSN 0273-1223
- Persistent URL
- https://sonar.ch/global/documents/235431
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