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8th Annual Meeting of DWRIP 30 January 2014 Utilisation of road runoff - Characterisation, modelling and laboratory treatment test Partners: By & Havn.

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Presentation on theme: "8th Annual Meeting of DWRIP 30 January 2014 Utilisation of road runoff - Characterisation, modelling and laboratory treatment test Partners: By & Havn."— Presentation transcript:

1 8th Annual Meeting of DWRIP 30 January 2014 Utilisation of road runoff - Characterisation, modelling and laboratory treatment test Partners: By & Havn Københavns Kommune HOFOR Grontmij DHI, Contact: Bodil Mose Pedersen

2 © DHI Nordhavn The old part of Copenhagen

3 © DHI Nordhavn

4 © DHI Nordhavn water partnership: Sustainable and environmental friendly city district in Copenhagen  Measures for groundwater saving  Online measurement of water quality  Handling of polluted road runoff Utilization of road runoff  Fulfilling the EU-requirements for discharge  Recreational facilities  Upgrading the water quality to secondary water supply Objectives

5 © DHI Characterisation of road runoff Modelling of runoff Laboratory tests of treatment technologies for upgrading of road runoff Outline a concept of treatment technologies for upgrading quality of road runoff with reference to discharge or utilisation in houses Project activities

6 © DHI Technology concept for treatment of road runoff

7 © DHI <300 vehicles/day 14,000 vehicles/day Discharge to marine water area Recreational utilization (discharge to fresh water areas) Sampling during rainfall events Spot sampling Flow depended sampling Road runoff collected for laboratory test Characterization of road runoff

8 © DHI ParameterUnitInterval General EQS marine Recreational use SSmg/l BODmg/l CODmg/l Total-Pmg/l0.851,50.06 Total-Nmg/l Copperµg/l Copper filtratedµg/l (2.9)1 (12) Zincµg/l Zinc filtreretµg/l< DEHPµg/l Bisphenol Aµg/l Acenaphthenµg/l< Fluorenµg/l< Phenanthrenµg/l Fluoranthenµg/l Pyrenµg/l Benzo(b,j,k)fluoranthenµg/l Benzo(a)pyrenµg/l Indeno(1,2,3-cd)pyrenµg/l Benzo(g,h,i)perylenµg/l

9 © DHI Critical parameters Suspended solids, BOD, COD, Total-P, copper (filtrated), zinc (filtrated), DEHP, Bisphenol A and PAH (5) Not critical parameters Total-N, lead, oil, NP and NPE and PFOS/PFOA (flourosurfactants), Discharge and recreational usage

10 © DHI Road runoff comes from roads with average annual daily traffic (AADT) of 14,000 vehicle/day Compact treatment facility easily integrated in the city environment (without disturbing the traffic) Capacity high enough to ensure less than 10 times of bypass per year High hydraulic capacity to ensure treatment when rainfall intensity is high Efficient removal of particles The hydraulic capacity of the treatment plant should equalize runoff from 1 reduced ha (4,600 m 3 /year) Construction and operation costs must be low No chemicals must be added Conditions for treatment technologies

11 © DHI Modelling runoff from the Århusgade neighbourhood Total: c m³/year Largest runoff in august Road runoff about 20% of total Treatment plant must handle m³/year or: m³/ha  year

12 © DHI Rainfall data collected over 5½ year from a rain gauge placed near Nordhavn Modelling of runoff from 1 ha reduced road MOUSE model used for generation of runoff time series Runoff time series used as input for calculating all combinations of : −Tank volumes (25, 50, 75, 100, 125, 150, 200 m³) −Sedimentations times (3, 6, 9, 12, 18, 24 hours) −Capacity of treatment plant (1, 2, 3, 4, 5, 10, 15, 20, 25 l/s  ha) Output data: Hydraulic and operating conditions for the treatment technologies

13 © DHI Total volume of runoff (m³/year) Volume of runoff treated in treatment plant (m³/year) Volume of runoff treated in treatment plant (percent of total runoff) Bypassed volume (m³/year) Bypass volume (percent of total runoff ) Number of bypass events (number/year) Number of rain events (number/year) Output data

14 © DHI Initial loss has been defined to 0.6 mm og concentration time 1 minute A runoff event is defined as the period beginning when the rain water enter the sedimentation tank and the period end when runoff no longer enter the sedimentation tank The treatment plant starts when the rain event has stopped and the defined number of hours has passed (corresponding the sedimentation time).The period end when a new rainfall event begin The shortest period between to runoff events has been defined to 3 hours Model conditions

15 © DHI Hydraulic considerations Calculation of minimum tank volume necessary to protect against maximum 10 bypass per year. Example show sedimentation time 12 hours and treatment capacity 5 l/s  ha

16 © DHI Hydraulic conditions Minimum tank size increase linear to duration of sedimentation and decrease gradually with the treatment capacity in the interval 1-5 l/s  ha Minimum tank size increases from 110 to 180 m³ when duration of sedimentation increases from 3 to 24 timer and treatment capacity is higher than 5 l/s  ha Bypassed volumes dependent on sedimentation time when treatment capacity is higher than 5 l/s  ha for a given tank volume Sludge volume must be included when tank size is designed As a precaution the plant capacity is set to 7.5 l/s  ha

17 © DHI Characterisation of particles in road runoff

18 © DHI Particle reduction is about 100 % for particles between 7 and 20µm Particle reduction becomes gradually lower for particles smaller than 7µm Three hours sedimentation of road runoff 3 hours sedimentation gives 90 % reduktion of particle volume

19 © DHI Test of High-Flow ceramic membrane filtration 1µm SiC membrane from Liqtech International A/S

20 © DHI ParameterUnit Sundkrogs­ gade Supernatant Sundkrogs­ gade Micro filtrated supernatant EQS marine EQS fresh water SSmg/l88-25 CODmg/l ) BODmg/l ) 3 Total-Nmg/l ) Total-Pmg/l ) 0.06 Copper Totalµg/l2311 Copper dissolvedµg/l (2.9) 2) 1 (12) 2) Zinc Totalµg/l7734 Zinc Dissolvedµg/l< ) Bisphenol Aµg/l Acenaphthenµg/l< Fluorenµg/l< Phenanthrenµg/l0.027< Fluoranthenµg/l0.17< Pyrenµg/l0.12< Benzo(b,j,k)fluoranthenµg/l0.098< ) 0.03 Benzo(a)pyrenµg/l0.035< Indeno(1,2,3-cd)pyrenµg/l0.029< ) Benzo(g,h,i)perylenµg/l0.038< ) )

21 © DHI Results from test of ceramic membrane filter Micro filtration through a 1µm SiC-membrane remove all particles in road runoff By removing particles follow decrease of critical substances Only concentrations of copper, zinc and bisphenol A might an issue for discharge to marine water areas Additional treatment might be necessary if dilution isn’t sufficient when discharging

22 © DHI Test of activated carbon filtration Expected full scale dimension (7.5 l/s  ha) Filtration 12 m³/m²  h Surface area 2.3 m² Column high 6 m (3 m each 2) Volume 13.8 m³ Carbon type: Filtrasorb F400 Grain size 1.0 mm Basis for laboratory tests has been scaling of a 3 meter full scale filter. Dimensions of laboratory filter: Filtration 0.8 m³/m²  h (7 ml/min) Surface area m² Column high 4 cm Column volume 19 ml Carbon type: Filtrasorb F400 Grain size 0.2 mm

23 © DHI ParameterUnit Micro filtrated supernatant AC (10.5 month full scale) AC (19.2 month full scale) AC (28.2 month full scale) AC (36 month full scale) CODmg/l BODmg/l Total-Nmg/l Total-Pmg/l Lead disolvedµg/l< Copper disolved µg/l9.6<1 Zinc Opløstµg/l Bisphenol Aµg/l0.28<0.01

24 © DHI Test of activated carbon filtration Concentrations of copper and bisphenol A are reduced below detection (operation in lab scale match 36 month in full scale) Concentration of zinc doesn’t change Capacity for removal of organic matter begin to decrease after 1½ year operation Removal of bisphenol A stay unchanged Activated carbon appear appropriate if dilution and background concentration (zinc) in receiving water enable discharge

25 © DHI Laboratory test of treatment technologies Treatment technology CapacityReduction Sedimentation 150 m 3, sedimentation time 11 hours 90 % particle reduction Micro filtration7.5 l/s·ha BOD, COD 55-80% reduction NPE, phthalater, PAH reduction below detection limit Activated carbon7.5 l/s·ha Bisphenol A below detection limit Dissolved lead and copper below detection limit

26 © DHI Pilot/demonstration plant Treatment Technology Capacity Operating costs DKK/year Construction costs mio. DKK Critical parameters after tratment compared to Danish and EU EQS Sedimentation tank150 m 3 180, Suspended solids, COD, Total-P, lead, copper, zinc, bisphenol A, 4 PAH Micro filtration7.5 l/s·ha74, , Dissolved copper, and zinc, bisphenol A Activated carbon7.5 l/s·ha45,000-48, Dissolved zinc

27 © DHI Report (in Danish) Utilisation of road runoff - Characterisation, modelling and laboratory treatment test Published : Thank you

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