Hannouche, A.; Chebbo, G.; Joannis, C. Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? SPN7 – Sheffield,

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Presentation transcript:

Hannouche, A.; Chebbo, G.; Joannis, C. Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? SPN7 – Sheffield, UK – August 2013

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 2 Context Importance of urban wet weather pollution; Negative impact of TSS ( main vector of certain contaminants ); High temporal variability of TSS concentrations and fluxes not only during event but also between events; Some studies have observed some spatial homogeneity between sites, as regards fluxes and concentrations (Kafi Benyahia et al. 2008: Spatial variability of the characteristics of combined wet weather pollutant loads in Paris. Water Research 42, ) Conventional sampling methods on samples collected during rain events:  limited number of samples per event  some events can be sampled Continuous turbidity measurement in sewer systems:  indirect access to the dynamics of particulate pollution

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 3 SOERE URBIS databases Statistically representative databases for continuous water flow and turbidity measurements at the outlet of:  two embedded catchments in Paris (Quais and Clichy)  one in Lyon (Ecully)  hundreds of rainfall events and dry weather days Aim of this study  Assessment of the variability of TSS fluxes and concentrations observed at the outlet of these catchments during both wet and dry weather periods (A long-term Observation System for research and Experimentation on urban environment)Lyon Paris

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 4   Quais catchment is totally embedded in the Clichy catchment complementary fraction of the “Quais” catchment denoted “Outside Quais”   Ecully’s characteristics are quite different vs. Parisian sites: low population density, residential area with steep slopes, and no street cleaning   Paris sewer network is known for its high deposit level but this is not the case for Ecully Description of the sites CatchmentsQuaisClichyOutside QuaisEcully Land usesDense urban residential Surface area (ha) Runoff coefficient (-) Active surface (ha) Median slope (%)

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 5  each site: 2 redundant turbidity sensors, 1 flow-rate sensor & 1 conductivity sensor   Flow-rate, turbidity and conductivity measurements: time step: 1 Quais & Clichy (2006), 2 Ecully (2004  2008))   Turbidity-TSS average relationship was applied   Available data set Equipments and available data set

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 6 RESULTS AND DISCUSSION Volumes, masses and concentrations at the level of rainfall events and dry days Wet weather Dry weather Distributions “Tukey box plots”

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 7 RESULTS AND DISCUSSION Volumes, masses and concentrations at the level of rainfall events Correlations between sites for common rainfall events

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 8 CONTRIBUTION OF SOURCES Contribution of different sources to mass results for each rain event 3 distinct origins of event load during a rain event (M Outlet ) :  Wastewater (M WW ),  Surface runoff (M SR )  Sewer deposits (M SD )  M SD =M Outlet -M WW -M SR TSS (mg/l) Turbidity (FAU) C runoff (mg/l)

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 9 RESULTS AND DISCUSSION Contribution of different sources to mass results for all rainfall events Absolute contribution Relative contribution Absolute contribution Relative contribution Distributions d 10 -mean-d 90

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 10 RESULTS AND DISCUSSION Contribution of different sources to mass results for common rainfall events Correlations between sites (Quais & Clichy)

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 11 Conclusions The results confirmed obtained for other Paris sites with similar land uses; Masses and concentrations for different rain events are correlated between sites with similar land uses The correlation between the concentrations is unexpected and may be a clue for some deterministic processes Regarding urban water discharges, wastewater is a decisive factor for two reasons:  Wastewater generates straightforwardly a significant part of the total event load  deposits contribution is also comparatively substantial; substantial contribution of sewer deposits is not specific to sewer systems like the Paris sewer network (low slope, coarse sewer deposits)

Ali Hannouche – SPN7- Wednesday 28 - Friday 30 August 2013-Sheffield, UK Dynamics of pollutant discharge in combined sewer systems during rain events: chance or determinism? 12 THANK YOU FOR YOUR ATTENTION Questions?