Omkring sampling af vejvand, hvad er repræsentativt. Regn med kvalitet Nødebo, 3-4/ Anitha K. Sharma+Peter S. Mikkelsen

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1 Omkring sampling af vejvand, hvad er repræsentativt Regn med kvalitet Nødebo, 3-4/ Anitha K. Sharma+Peter S. Mikkelsen

2 Online sampling af vejvand, Hvad er repræsentativt Regn TSS (mg/l), Cu T ( g/l) and Cu D ( g/l) Flow Cutotal Cu dissolved Rain Koncentration Flow Vinter/Sommer

3 The stormwater specific context Monitoring is sparse and fragmented, and mostly includes only conventional pollutants including a few heavy metals Most monitoring campaigns have too few, or too bad samples to say much about site mean concentrations (SMCs) or the distribution of Event Mean Concentrations (EMCs) Stormwater discharges are more dynamic than most other discharges (use patterns, antecedant dry weather period, rainfall volume/intensity,...) The efficiency of treatment systems for micropollutants is generally not documented Flow- or volume proportional sampling is technically complicated Chemical analysis is expensive Need for monitoring in a smarter way (many substances, integration over long durations yet still grasping the dynamics) => Source tracing and Substance Flow Analysis (Dry Approach) => Combine classical monitoring with passive samplers (Wet Approach) => Understand via dynamic chemical fate modelling => Conduct uncertainty assessment

4 Introduction - stormwater sampling Traditionale metoder Stik Prøver Tids-, volume-, eller flow-proportional Prøvetagning Store variation over tid Mange stoffer Volume-proportional sampling Store omkostninger Store analyse udgifter Nye metoder: Passiv sampling over lang tid

5 Integrated system scale pollutant fate modelling (Integrating different sub-system models) SOURCES Boundaries of the urban system RELEASE Soil / Groundwater WWTP Fate models technosphere Treatment options Stormwater BMPs Septic tank on-line sludge treatment Activated sludge biofilters Air Physical-chemical treatment Lagoon/pond SURFACE WATER Sludge Sediments Fate models environment Water Air Benedetti et al. (2009): WEFTEC 09 - De Keyser et al. (2010): Water Sci & Technol, 62(7), Vezzaro et al. (2010): Water Sci & Technol, 62(3), Vezzaro et al. (2011): Sci. Total Environ, 409(13), Vezzaro et al. (2012): Phys. Chem. Earth, 42-44, Vezzaro & Mikkelsen (2012): Environ. Mod & Softw., 27-28, 40-51

6 Kombinere kilder, målinger og modellering

7 Example: Passive sampling og modelling Modelled Cu conc. Measured Cu conc. Passive sampler = modelled av. conc. First/prelminary results, promising but need to be confirmed! Bich, H. 2012, Optimised Model-based Monitoring of Water Quality in Dynamic Discharges from Urban Areas. Ph.d. Thesis, DTU Environment, Kgs. Lyngby, Denmark

8 Our perspectives on monitoring Surveillance monitoring Operational monitoring Investigative monitoring AA-EQS MAC-EQS Lakes, rivers, the sea Point sources and stormwater discharges Grab samples Diffusion based passive sampling + passive dosing Flow through passive samplers Volume-proportional sampling Transport and fate modeling Bich, H. 2012, Optimised Model-based Monitoring of Water Quality in Dynamic Discharges from Urban Areas. Ph.d. Thesis, DTU Environment, Kgs. Lyngby, Denmark

9 Præsentation af Database for kvalitet af regnafstrømning Regn med kvalitet Nødebo, 3-4/ Anitha K. Sharma & Hans-Christian Holten Lützhøft Arbejdsgruppe: DTU Miljø: Anitha K. Sharma, Hans-Christian Holten Lützhøft, Peter S. Mikkelsen KU: Marina Bergen Jensen, Simon Toft Ingvertsen, Karin Cederkvist, Peter E. Holm, TI: Ida Marie Knudsen GEUS: René K. Juhler

10 Emner Hvilke data findes der om regnvandskvalitet i Danmark? Hvilke informationer er nødvendige for at vurdere data om regnvandskvalitet? Afprøvning af databasen

11 Hvilke data findes der om regnvandskvalitet i Danmark? DHI: data fra Nordhavn DTU: Indløb til bassin K KU: DPF-data og snart data fra SDU-p-pladsen data fra DiPol projekt: DTU, DHI, KU, Albertslund, Glostrup, Hvidovre, København Data fra COHIBA projekt: DTU, DHI,.????

12 Hvilke informationer er nødvendige for at vurdere data om regnvandskvalitet? Oplandet Hvor stort er oplandet, Oplandets sammensætning (f.eks. veje, industri, villa) samt materialer (asfalt, beton, metal, tagpap osv.) Forrensning f.eks., sandfang, olieudskiller osv. Regn og flow Regnintensitet, varighed, flow, tørvejrsperiode osv. Prøveudtagningsmetode Stikprøver, flowproportionale prøver, tidsproportionale prøver osv. Udtaget prøvevolumen i forhold til det totale volumen Transport og opbevaring af prøverne Temperatur under transport, transporttid Analyse Forbehandling, analysemetode osv., antal gentagelser osv.

13 Afprøvning af databasen