Odense & VCS Denmark 3rd largest city in Denmark 200,000 Inhabitants Birthplace of H.C. Andersen VCS Denmark est Reputation for innovation

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1 Integreret modellering i Odense. En ny tilgang til udvikling af langsigtede og integrerede spildevands- og regnvandsløsninger Dansk Vand Konference November 2016 Odense & VCS Denmark 3rd largest city in Denmark 200,000 Inhabitants Birthplace of H.C. Andersen VCS Denmark est Reputation for innovation P. Hallager*, A. Brink-Kjær*, J. Hénonin*, E.J. Gill**, L. Benedetti** (*VCS Denmark, **CH2M) EUREAU 1

2 Odense wet weather challenges: 150+ CSOs, 80+ storm water outfalls, and 3 WWTP Rivers in Odense Water quality control: Danish Stream Fauna Index - DVFI CSO permit: max. 5 overflows/year retention volume 250 m 3 /ha/year EUREAU 2

3 Challenges & Strategy Climate change City redevelopment & growth Rivers must achieve Water Framework Directive (WFD) Good Ecological Status (GES) Regulator s approach to wet weather permitting Separate consideration of CSO and WWTP Annual CSO discharge volume (250m 3 /ha) Annual CSO discharge frequency (< 5) Questions: Affordability? Protecting GES? Prioritisation? Operating costs? Impact of planned collection system upgrades on WWTP? Impact of collection system CSOs & WWTP on river chemistry (DO, NH 4 ) & WFD compliance? Combined vs. separate system wrt receiving water quality What is best grey-green infrastructure mix? Capital & operating costs? Climate change? Where to invest in data collection? Integrated modelling Diffuse sources Urban catchment Infiltration Natural runoff Interaction with groundwater Sewer Wet weather treatment CSO System boundary Wastewater treatment Integrated Model Calibrated + Validated Surrogate Sub-Models Catchment Sewer WWTP River Catchment Sewer WWTP River Separate Detailed Physical Models Calibrated + Validated Individually EUREAU 3

4 Modelling process Simplified Integrated Model in DHI WEST Collection [KATEGORIN AVN] [PROCENTD EL] system pumping 2% WWTP pumping 19% WWTP sludge processing 5% WWTP chemicals 29% WWTP aeration 14% EUREAU 4

5 NV WWTP Odense simplified model NOE WWTP Building trust in the model Comparison to collection system model EM WWTP sewers rivers Odense integrated model in DHI WEST (1 1 minute Timestep in 1.5 hours) Overflow volume for all catchments 1 year EUREAU 5

6 Dissolved oxygen, temperature, ph, conductivity, ammonia Building trust in the model Water Quality monitoring system Rainfall Ammonia Dissolved oxygen EUREAU 6

7 Global Sensitivity Analysis Monte Carlo simulation (2,000 simulations) parameters Sharing data Water Quality monitoring system Preliminary general conclusion: Most important parameters are: 1. River upstream inputs 2. Water consumption per inhabitant 3. Infiltration 4. Pollutants loadings per inhabitant 5. Accumulation and wash-off of pollutants 6. Sedimentation and resuspension of solids 7. Rainfall 8. Temperature 9. ph 10. Reaeration 11. CSO concentrations 12. Manning s coefficient EUREAU 7

8 Result analysis & presentation Urban Pollution Management approach UPM: wet weather design standards guidelines in UK Environmental Quality Standards: concentrations of target substances with tolerated frequencies-duration UPM approach presentation frequency frequency duration concentration UIAc salm. Duration of the event curr sc1 sc2 1: <80% tolerated 1-5 h 6-24 h > 24 h Tolerated frequency frequency per year : >80% <120% DO salm. Duration the event 3: >120% <200% of 1-5 h 6-24 h > 24 h Tolerated : 6.0 >200% <500% frequency per year : 4.0 >500% Requirements Results Illustrating an annual cycle, which just meets frequency/duration requirement for 1-5 hours DO EUREAU 8

9 Result analysis & presentation Urban Pollution Management approach Scenario 1: 9,210 m 3 of additional CSO storage volume at 9 locations 3 upgraded pumping capacities (additional 57 l/s) at CSO structures Scenario 2: 700 m 3 of additional volume at one CSO location 9 upgraded pumping capacities (additional 467 l/s) at CSO structures 2 new pumping stations (1,000 and 500 l/s) a new scheme to accept higher wetweather flows at the NV WRRF (up to 2,500 m 3 /h biological treatment, from 2,500 to 10,000 m 3 /h a combination of treatments as settling, sand and disk filters) UIAc salm. Duration of the event curr sc1 sc2 1-5 h 6-24 h > 24 h Tolerated frequency per year Future works Measurement stations Global Sensitivity Analysis Adaption of UPM standards for Denmark (Odense Municipality & Aarhus University) First set of river monitoring data First river quality calibration Development of planning scenarios with Odense Municipality DO salm. Duration of the event 1-5 h 6-24 h > 24 h Tolerated frequency per year EUREAU 9

10 Conclusions Real-life example of integrated model being used to develop a wet weather management approach Outcome focus! What infrastructure (or operational rules) are needed to achieve river quality standards? Integrated model approach gives fresh insight into wet weather dynamics storage or treatment? green or grey? Fast simulation speed allows proper sensitivity testing, uncertainty analysis & robust scenario testing Danish Regulator is open to this new approach because it delivers value for money and is scientifically based VCS, Regulator and CH2M working in partnership to develop a long-term wet weather plan for Odense Thank you for your time EUREAU 10