Ecotechnologies for the Treatment of Variable Stormwater and Wastewater Flows by Katharina Tondera Godecke-Tobias Blecken Florent Chazarenc & Chris C. Tanner

Author:Katharina Tondera, Godecke-Tobias Blecken, Florent Chazarenc & Chris C. Tanner
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Stormwater ponds have the potential to remove microorganisms considerably since significant percentages of bacteria are associated with particles as discussed previously (Characklis et al. 2005). A performance summary of stormwater retention ponds in the International Stormwater BMP7 database shows the greater removal of E. coli (median removal 96%) compared to other systems (median removal 65 to 80%) (Clary et al. 2017). However, comparing the bacteria removal capacity of ponds and CWs, Davies and Bavor (2000) showed that ponds may have a relatively low ability to remove bacteria since fine particles < 2 µm to which bacteria are predominantly adsorbed are not often retained well in ponds. Additionally, Hathaway et al. (2009) found highly varying indicator bacteria removal in ponds and, thus, do not recommend ponds as a first choice when bacteria removal is targeted. Similarly, Pan and Jones (2012) reported relatively efficient enterococcus removal by a detention basin in Houston, TX, USA whilst a similar facility in Dover, DE, USA showed increased enterococci concentrations illustrating the high variability in bacteria removal. Similarly, other detention basins have also shown net export of indicator bacteria (Clary et al. 2010). However, some detention basins/ponds may provide significant volume reduction for storm events and so may be effective in reducing bacterial loading to receiving waters despite minimal reductions in concentrations.

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