Abstract
Combined sewer overflows (CSOs) can cause serious damages to aquatic ecosystems due to short term hydraulic and pollutant load peaks. Pollution based real time control (p-based RTC) can be an effective measure for reducing negative impacts of CSOs on receiving waterbodies. The presented paper assesses the potential of p-based RTC based on online quality measurements from a CSO tank in Germany. Flow and quality data was evaluated for 33 events with special focus on first flush phenomena and other factors reducing the efficacy of a pollution based real time control. No significant correlations between different event characteristics such as duration of previous dry weather period, rain intensity or total precipitation could be identified. This implies that the approach of accumulation and washoff may not be sufficient for realistic sewer quality modelling as a basis for p-based RTC and therefore, this type of RTC may not always be best for minimising CSO impacts.
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