10.4122/1.1000001595
Gasperi, J.
J.
Gasperi
Moilleron, R.
R.
Moilleron
Chebbo, G.
G.
Chebbo
Spatial variability of PAH load of urban wet weather pollution in combined sewers
DTU Library, Technical University of Denmark (DTU)
2005
Conference presentation
Combined sewer network
dry and wet weather flows
experimental catchment
PAH
spatial scale
Universit\303\251 Paris XII
ENPC
Universit\303\251 Libanaise, Facult\303\251 De G\303\251nie
Facult\303\251 De G\303\251nie
Universit\303\251 Libanaise
2005
en
10.4122/1.1000001596
text/xml
The OPUR research programme created in Paris an experimental on-site observatory of urban pollutant loads in combined sewer systems in order to characterise the dry and wet weather flows, at different spatial scales. This article presents the first results on the spatial variability of the PAH load during wet weather flow (WWF). At the scale of a rain event, investigations revealed that (i) PAH concentrations were relatively homogenous whatever the spatial scale and were greater than those of the dry weather flow (DWF); (ii) PAH distributions between dissolved and particulate phases were constant and (iii) PAH fingerprints exhibited a similar pattern for all catchments. Moreover, an evaluation of the contribution of DWF, runoff and erosion of sewer deposits to WWF load was established. At the scale of the Marais catchment, the contributions were evaluated at 14, 8 and 78%, respectively. For all the catchments, runoff contribution was found quite constant and evaluated at about 10%, according to the calculation hypothesis. The DWF contribution was greater for bigger catchments (>900 ha) when compared to the Marais catchment (42 ha). On the contrary, the sewer erosion contribution was lower for larger catchment, but still remains an important source of pollution.