2012 12 04 Handout Floris Boogaard Copenhagen stormwater
Transcription
2012 12 04 Handout Floris Boogaard Copenhagen stormwater
Tauw 12/4/2012 Stormwatermanagement in the Netherlands Examples on documentation of treatment technologies and the practice for discharge permits in The Netherlands Floris Boogaard Copenhagen, 4 december 2012 ir. F.C. (Floris) Boogaard, (020) 606 32 50/06-51 55 68 26 e-mail: [email protected] [email protected] Partners Skills integration and New Technologies: transnational approach The Netherlands: • Delft University of Technology • Hoogheemraadschap Hollands Noorderkwartier Germany: • Hamburg University of Applied Sciences Norway: - NIVA, Norwegian Institute for Water Research UK: • Bradford City Council • University of Sheffield • University of Abertay Dundee Dutch water management: biggest challange Content: knowledge exchange and inspire • • Introduction Situation in Holland • Stormwater quality and characteristics: database • Quality discharge requirements • Hydraulic discharge requirements (1-2 l/s/ha) • • Research on ´BMPs` SUDS (lab and field) • Sedimentation • Infiltration • Filtration adsorbtion Interactive part • Questions-requests • Interactive international communication tools Introduction Tauw BV • Innovating consultant agency • Top 10 of Dutch engineers • 1100 consultants • € 110.000.000 turn over • 6 offices in the Nederlands • 11 offices around Europe Dutch water management: Quantity ‘urbanisation changed:waterbalance’ 1900 Titel presentatie 1970 2005 1 Tauw Europe: floodings… 12/4/2012 WaterTown: Four Districts WaterBurgh – integrated Wetley-Tetley – Pluvial planning flooding 8 Egmond – political Bryggen – settlement of decisions historic buildings Challenges …or adaptation? water quality challenges Water quality Second biggest challange combined sewer systems B=7 mm+ 2 mm Titel presentatie 2 Tauw 12/4/2012 Introduction Dutch sewer management: Quantity • • • • Disconnecting stormwater: Less sewer overflows Optimizing sewage plants Natural waterbalance • Improving surface water quality….? How to deal with stormwater? The quality aspect of SUDS Government ‘Storm water is considered to be cleaner than sewerwater so normaly no treatment is needed for purification’ • Harvesting, infiltration, … Stormwater is clean? From stormwater quality to: Guidelines for storm water purification Nieuwe lozing bestaand of nieuw gebied category? Industrial/commercial/residential areas Licht verontreinigde oppervlakken Daken/ gevels - vrijliggende voet-/fietspaden; - kantorenoppervlakken; - schoolpleinen; - parkeergelegenheden voor personenauto's (lage wisselfrequentie). Nieuwe lozing in bestaand of nieuwe gebied Matig verontreinigde oppervlakken - kantoorterreinen; - wijkontsluitingswegen; - woonerven; - winkelstraten; - doorgaande wegen; - busbanen; - parkeerterrein (hoge wisselfrequentie); - parkeerterrein vrachtwagens. Verontreinigde oppervlakken - bedrijfsterreinen; marktpleinen; laad-/ losplaatsen; overslagterreinen; busstation; trambanen; tunnels. Purification method needed? SUDS? - zinken dakgoten - lood & koper in excessieve toepassing nee W VO-vergunning met algemene en specifieke ('coaten') voorschriften Research what is the Dutch storm water quality? zuiveringstechnieken gewenst : bv. - slibafvang, - bodempassage. nieuw gebied bestaand gebied ja vervangen/ behandelen/ coaten/ voorzieningen ja nee niet afkoppelen vereiste zuiveringstech. - zand- en slibafvang; - bodempassage. vereiste zuiveringstech. - slibafvang; - olieafscheider;* - bodempasage. - niet afkoppelen - verbeterd gescheiden stelsel (VGS) of gelijkwaardige voorziening toepassing van uitlogende materialen ja nee W VO-vergunning met algemene voorschriften W VO-vergunning met algemene voorschriften W VO-vergunning met algemene en specifieke voorschriften W VO-vergunning met algemene en specifieke voorschriften database Database storm water database • • • content: ca 10.000 measurements Over 250 locations in the Netherlands with different type of catch area. More then 100 locations abroad (near european) Titel presentatie 3 Tauw 12/4/2012 What are the characteristics of stormwater? Filtration/sedimentation Research: contaminants in stormwater? Compared to dutch quality standards for surface water solved bound to sediment Average international literature Highest study average Lowest study average Distribution pollutant stormwater runoff • Contaminents: heavy metals, PAH’s Nutrients 100% 90% percentage [%] 80% 70% 60% 50% 40% 30% 20% 10% Phosphate Chloride Nitrogen Chrysene PAH(10)-total Anthracene Fluoranthene Naphthalene Phenanthrene Pollutant Cadmium Zinc Lead Nickel compared to ‘MTR-standard’. (Maximaal Toelaatbaar Risico). MTR: green: <= MTR; orange: <2* MTR; red: more than twice MTR. Copper 0% simon Rainwater characteristics Rainwater characteristics • um SUDS in holland Stormwater characteristics in Holland WB 21 100.0 100% 850-2000 70% 425-850 60% > 63 250-425 µm 50% 150-250 40% 75-150 30% 63-75 < 63 20% µm 45-63 23-11-2006 4/5-12-2006 80.0 4/5-12-2006 7-12-2006 70.0 7-12-2006 8-12-2006 25-38 0% Specificatie techniek of product Kleinschalige benutting benuttingsinstallatie - regenton, bergingszak regenwaterbenuttingsinstallaties Vasthouden Vegetatiedak daktuinen - mos-, sedum-, grasdak uitgebreide berging op daken Infiltratie bovengronds Wadi’s, bermfiltratie - maaiveldprofilering “ Doorlatende verharding - halfverharding, doorlatende verharding (waterpasserende stenen, nokkeninfiltratie) doorgroeibare verharding (grastegels) Infiltratie ondergronds (percolatie) Infiltratieriolen, Infiltratiesleuf Infiltratieunits, infiltratieput/zakputten Diepinfiltratie - IT: beton en kunststof grindkoffers kratten, honingraad, krukjes, bollen Afvoer direct Directe afvoer naar oppervlaktewater - gesloten, open leidingen (goten) (verbeterd-) gescheiden stelsel Filtratie Kleinschalige decentrale filters - Bladvang, buisfilter (cycloon,..) Filterkolken, zandvangputten, Filtratie, adsorptie Bodempassage - zoals wadi, vaak met extra bindingsstoffen Adsorptie Adsorbens textielen - zeoliet, actief kool, lava, kokoskorrels humus 3DWater Sorb-X Bezinking Centrale filters Lamellenafscheiders (ondergronds) - slibvangputten, olieafscheiders - facet/hydrasep, 3D “ Bezinkbakken, bezinkvijvers (bovengronds) - 8-12-2006 60.0 16-12-2006 16-12-2006 50.0 30/31-12-2006 30/31-12-2006 40.0 1-1-2007 1-1-2007 30.0 Afvoeren 4-1-2007 4-1-2007 6-1-2007 20.0 38-45 10% afkoppelmethode Benutting 23-11-2006 90.0 % of particles (in mass) with lower velocities 2000-4750 80% 21-11-2006 21-11-2006 4750-9500 90% Vasthouden/ Bergen • Insights to simulate • Examples of solutions …. categorie 6-1-2007 10-1-2007 10.0 10-1-2007 11-1-2007 Koper Lood Zink Cadmium mm 0.0 0.01 11-1-2007 0.1 1 10 Settling velocity (m/h) 17/18-1-2007 17/18-1-2007 solved bound to sediment Average international literature Highest study average Lowest study average Distribution pollutant stormwater runoff 1 00% 9 0% 7 0% 6 0% Zuiveren percentage [%] 8 0% 5 0% 4 0% 3 0% 2 0% 1 0% Titel presentatie Chloride Nitrogen Phosphate Chrysene Anthracene PAH(10)-total Fluoranthene Phenanthrene Lead Cadmium Zinc Pollutant Naphthalene Nickel Copper 0% betonnen bakken, damwanden, natuurvriendelijke oever 4 Tauw 12/4/2012 Suds in holland Research Good examples are not hard to find… development time 1992 Learning from disfunctional SUDS: communication interactive communication: interactive meetings, fieldtrips, interviews, courses, seminars, jobrotation, augmented reality, serious gaming, … Spacial planner maintenance 4 december 20121 November 2007 27 SUDS: examples BMP´s and quality achievements Sedimentation: • Small underground measures • Sediment basins • Pounds • Substrate filters Laboratory testing pervious pavements grassed swales (dry) infiltration trench/soakaway • sedimentation grassed filter strips infiltration basin grassed swales (wet) (in-)filtration: • 1 research infiltration projects in Holland • Surface • Non-surface • High removal watersystems • Filtration adsorbtion substrate green roofs filter drains extended detention pond wet ponds stormwater wetlands on/off line storage bioretention sand and organic filters Titel presentatie 5 Tauw 12/4/2012 How to rate the achievements of the separators? Focus: Small scale sedimentation water sand example: lamellar separator But do they work? development Problem: no system to compare different products Re se ar ch ? Research questions: • What is the quality and characteristics of stormwater? • What is a good testing method • What is the efficiency of (new) ‘SUDS’? 2000 2005 2009 time Simulate stormwater for lab Methodology / Program • Fine particles: Millisil W4 • Literature • Visualisation of flow conditions • Pottasium permanganate 100% > 4750-9500 90% 2000-4750 80% 850-2000 70% 425-850 60% 250-425 50% 150-250 6 40% < 3 30% 20% 6 10% 3µ 0% m µ m • Hydraulic performance • Pressure loggers • Flow rates by acoustic flow meters • CFD modelling 75-150 63-75 45-63 38-45 25-38 Koper Lood Zink Cadmium mm solved bound to sediment Average international literature Highest study average Lowest study average Distribution pollutant stormwater runoff 1 00% 9 0% percentage [%] 8 0% 7 0% 6 0% 5 0% 4 0% 3 0% 2 0% 1 0% Titel presentatie Chloride Nitrogen Phosphate Chrysene Anthracene PAH(10)-total Fluoranthene Phenanthrene Lead Cadmium Zinc Pollutant Naphthalene Nickel Copper 0% 6 Tauw 12/4/2012 Summary measurement program will be guideline for Nl/EU Methodology / Program First hydraulic results • Removal efficiency • By: Particle counting • Materials: Millisil W4 • Remobilization • Visual interpretation • Materials: Millisil W4 Determine Qmax ( x l/s) And flush out visualization Removal efficiency Field testing Basic research: visualization and communication. The helicopter view The Results: Research versus salesman: achievements of the separators Grafiek rendement lamellenfilters (afstand in inch) Geen pakketten (1/2-1/2-1/2) 10 l/s (1/2-1/4) 10 l/s (3/4-1/4-1/4) 10 l/s (3/4-1/2-1/4) 10 l/s (1/2-1/2-1/4) 10 l/s 100% 90% 80% R endem ent in % 70% 60% 50% 40% 30% 20% 10% 0% 0,00 10,00 20,00 30,00 40,00 50,00 60,00 Particle Size (micron) 4 december 20121 November 2007 The field: Basic research Learning from dysfunctional SUDS: 4 december 20121 November 2007 Titel presentatie 40 Solving the problem together 41 7 Tauw 12/4/2012 product improvement Media on lamellar separators •The 5 big questions and •Maintenance •Sediment storage •Course sediment shield •Inspection •Documentation •….. More Research • • Measurements Rainwater and: 1. 2. 3. 4. 5. 6. Measurements in the lab • Period: 2010 – end 2012 • Testing: Scale and full scale Lamellar Gullies Certaro Sparc life (+filtration) Cyclone Sedi pipe Results in papers (more sedimentation in field) Get out of the lab into the field Roskilde: basin with wetland Sedimentation: • Small underground measures • Sediment basins • Pounds • Substrate filters (in-)filtration: • 1 research infiltration projects in Holland • Surface • Non-surface • High removal watersystems • Filtration adsorbtion substrate Titel presentatie 8 Tauw 12/4/2012 Amsterdam sedimentation: bassin Amsterdam sedimentation: bassin Bassins (quality aspects) After 8 years sedimentation: Julianapark sedimentation ponds Gemiddelde slibdikteopbouw ontvangstbak Julianapark raai 5 (overstort) raai 3 (midden) raai 1 (uitstroom) Overflow Middle inflow 1350 1000 480 327 wet ponds TSS Titel presentatie hydrocarbons Phospouros Nitraat totaal ecoli bact max removal min removal max removal min removal max removal min removal max removal min removal Measurements 1994-1996 (1-9) till 2002 (10) After two years no measurable pollutant accumulation max removal meting 1t/m9 in '94-'96, meting 10 anno 2002 wet ponds 100 90 80 70 60 50 40 30 20 10 0 min removal metingmetingmetingmetingmetingmetingmetingmeting meting 9 meting 1 2 3 4 5 6 7 8 10 max removal 470 467 465 397 397 377 362 377 205 210 208 228 232 215 193 200 140 165 125 128 110 128 133 113 min removal 337 187 105 15126-21995 22-21995 24-31995 21-41995 16-51995 12-71995 25-91995 9-41996 0 removal efficiency [%] 500 2810- slibdikte [m m ] 1500 heavy metals 9 Tauw Some more ponds ‘keep it simple’ 12/4/2012 Get out of the lab into the field Sedimentation: • Small underground measures • Sediment basins • Pounds • Substrate filters (in-)filtration: • 1 research infiltration projects in Holland • Surface • Non-surface • High removal watersystems • Filtration adsorbtion substrate Infiltration: Roskilde residential area with gutters and swales (in)filtration layer gully geotextile storage Example swale Oostzaan (stormwater is pumped to central location) Titel presentatie drain Example swale in Amsterdam 10 Tauw 12/4/2012 Example swale near road Naviduct Enkhuizen (height difference) difference) Example swale in Zutphen rough, extensive maintenance infiltration: examples Swales in Bryggen Fieldtrip • First swales in holland towards sustainable watermanagement & SUDS @ Bryggen Red swale Green swale Blue swale Hydraulic performance w adi [m+NAP] Relatie neerslag, waterstand wadi en waterstand drain april 2001 5 maaiveld t.o.v. NAP 4 3 2 1 Neerslag [mm] n e e r s la g ( m m ) Regenmeter w a te r s ta n d (m + NA P ) drain [m+NAP] 33,00 32,80 32,60 32,40 32,20 32,00 31,80 31,60 31,40 31,20 31,00 0 datum Titel presentatie 11 Tauw 12/4/2012 Long term infiltration rate Quality of water and removal efficiency tijd>mv [totaal 11%] tijd>mv [totaal 11%] h>5cm h>10cm h>5cm h>10cm h>15cm h>20cm h>15cm tijd>slokop [1%] h>20cm Kwaliteit waterstromen in Ruwenbos te Enschede hemelwater 'landelijk', [RIVM] hemelwater Ruwenbos 1000,000 regenwater van daken (gem.) regenwater van wegen en daken (gem.) tijd>slokop [1%] drainagewater grondwater streefwaarde grondwater interventiewaarde grondwater 100,000 Concentratie (ug/l) droog [89%] 10,000 1,000 0,100 0,010 zink lood koper droog [89%] benzo(a)pyreen 0,000 Stof Results toplayer 6 years fluorantheen 0,001 Dry Swales • Removal efficiency Barrett, 1998 72% 71% Walsh et al, 1997 Roesner et al, 2000 54% 37% Higways Agency et al, 1998 Zinc Lead Copper Luker and Montaque, 1994 Hydrocarbons stof 0,10 53% Cadmium 1,00 72% 46% TSS concentraties [mg/kg ds] 10,00 USEPA, 2003 (mediaan) 74% total phosphorous 100,00 'Swales' 100 90 80 70 60 50 40 30 20 10 0 nitrate/nitrogen slibmonsters Ruwenbos, ZM Rendement [%] meetjaar 1 monstername 1mei 2000 meetjaar 2 monstername 2 mei 2001 meetjaar 3 monstername 2 mei 2002 meetjaar 6 monstername 2005 (0-5 cm) streefwaarde meetjaar 1 streefwaarde meetjaar 2 Winer, 2000 Schueler, 2001 minimale waarde maximale waarde gemiddelde waarde zink lood stof koper 0,01 Underground infiltration fascility stormwater Principale and different products transport/storage and infiltration overflow berging infiltration More risks: near or in groundwater, water not visible Titel presentatie 12 Tauw 12/4/2012 Filled storage infiltration infiltration trench/soakaway Infiltration boxes • Different materials: • Gravel, argex, … • Different products • Large storages can be achieved • Hard to maintain hydraulic conductivity conductivity [m/etm ] • Not the whole storage is used zandige klei zeer fijn zand grof zand grind 1E-05 0,0001 0,001 0,01 0,1 1 10 100 1000 [m /day] porositeit porositeit grond/granulaat grof zand grind (fijn, grof) geëxpandeerde kleikorrels lavastenen (fractie 2/16; 16/32) infiltratievoorzieningen (holle ruimten) 0 20 40 60 80 100 porositeit [%] • Examples of Infiltration and transport sewers: IT Several types: speric infiltration elements > Six research sites • • Sand trap ‘High & dry’ vs ‘Low & wet’ Different infiltration devices • • • • • • Research: Cellular infiltration units Swales Soak away pits Infiltration trenches Cellular units Existing, residential areas Monitoring results 8-12 years ago for reference Introduction 11th ICUD Research sites Results August 31st – September 5th 2008 Titel presentatie Construction Clogging Recommendations Edinburgh, Scotland Introduction 11th ICUD Research sites Results August 31st – September 5th 2008 Clay Recommendations Edinburgh, Scotland 13 Tauw 12/4/2012 Hydraulics: better than expected Filtration water level in device 25 • visual inspection: geotextile is clogged 20 • Removal efficiency Zakput Lenneplaan Contaminents build-up in infiltrated soil after 40 years Zink Nikkel Lood Koper Chroom cadmium bodem 15 • time to empty: infiltration capacity satisfactory 10 5 0.5m-bodem 1m - bodem • linear -> bottom not silted yet 0 Time ref 0.01 Introduction Research sites 11th ICUD Results Recommendations August 31st – September 5th 2008 0.1 1 10 100 1000 10000 concentratie [mg/kg Concentration [mg/kg ds] ds] Edinburgh, Scotland Results soilquality Pollution: worst case zinc roofgutters 1997, - 1.20 m 1997, - 1.60 m • Contaminents caught in the first 50 cm 2007, - 1.20 m 2007, - 1.60 m 40 Diepte in cm-mv 0 20 40 60 80 100 120 140 160 180 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 Arseen Lood mg/kg dry matter 35 Concentraties mg/kg d.s. 30 25 20 15 10 5 Koper Zink 0 Copper Lead Introduction Research sites Recommendations Pollution: in average no exceeds Results Hydraulic capacity No significant loss (recommondations: sandtrap) Bottom is silted (as assumed in design) Geotextile is vulnerable (open pore-width/wovens better) Construction in dry conditions A v e r a g e c o n c e n tr a tio n s r e la te d to n a tio n a l r e fe r e n c e v a lu e s - 1 ,2 0 m - 1 ,6 0 m Zinc Results - 2 ,0 0 m 1 0 0 ,0 0 Recommondations: Use design guidelines (see paper) Good research/measurements of soil and grondwater Construct an overflowsystem 1 0 ,0 0 1 ,0 0 0 ,1 0 a rs e n ic c h ro m e cop p er le a d n ic k e l z in c 0 ,0 1 Introduction Research sites Recommendations Results WWW.RIONED.ORG Titel presentatie 14 Tauw 12/4/2012 Get out of the lab into the field Filtration adsorbtion projects Sedimentation: • Small underground measures • Sediment basins • Pounds • Substrate filters (in-)filtration: • 1 research infiltration projects in Holland • Surface • Non-surface • High removal watersystems • Filtration adsorbtion substrate Pilot Rotterdam: Vaanweg situation: waterquality problems Substraten: lab test Rainwater from a road (high trafic intensity• has to be stored and cleaned with high efficiency filter Substraten getest op: Substraten in praktijk: • Zuiverend vermogen • Lava • Doorlatendheid • Olivijn • Sterkte • Actief kool • Duurzaamheid • Geoxideerd filterzand Laatste beschikbare tekening The system Results Rotterdam Hydraulic put 1 put 3 put 7 Neerslag -2.000 storage and retaining water 60 -2.100 50 -2.200 Removal efficiency heavy metals and PAH > 70% (n=23• m NA P -2.300 40 -2.400 30 -2.500 -2.600 20 -2.700 10 -2.800 01 1 01 1 01 1 2-2 2-2 2-2 -1 -1 -1 14 13 12 1 011 1 1 01 1 2-2 11 -1 10 -1 2-2 01 2-2 9-1 11 01 01 20 -2 2-2 2- 12 8-1 7- 6-1 1 1 01 01 2-2 2-2 2-2 4-1 3-1 5-1 1 01 01 2-2 2-2 2-1 1-1 solved bound to sedim ent Aver age international literature Highest study average Lowest study average D ist ribut ion pol luta nt s tormwa te r runoff 011 0 1 -2.900 Date 1 00 % 90 % 80 % percent age [%] gemiddeld rendement lavafilter Rotterdam 70 % 60 % 50 % 40 % 30 % 20 % 10 % Regenmeter Waterstandsmeters EC meters Titel presentatie V=200 m3 Av= 0,6 ha C hlor ide N itrogen Phosphat e Zinc Lead C opper Chrysene Cadmium Anthracene N aphthalene Fluoranthene Nickel Tijdsproportionele monstername PA H(10)-total Pollu tant Phenanthrene 0% 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% gemiddeld rendement BZV5a N NH4 P Cu Pb Zn Naf Pyr Flu BaP 15 Tauw 12/4/2012 Pilot Eindhoven: Doornakkers (swale) situation: floodings and WFD Case Eindhoven stormwater has to be stored (2000 m3• in watersystem with swales. A sediment channel is built and less than 1,68 l/s/ha can be discharged to a WFD body with good quality. grondverbetering slokop geotextiel berging Rotterdam Resultaten ratio Av /substra at [1:x) Oss Eindhoven drainbuis Optimalisation with Iron oxide residue drinkingwater industry 30 150 12.000 • optimalisation 29/6/2012 • Hydraulic: storage and discharge meet ambitions • Removal efficiency: drift contaminants • Micro pollutants not sufficient • Optimalisation needed • Reuse oxideced sand Ca 10 cm/d • Effluent visual clean • Checking effluent with optimalisation: 'Swal es' Barrett, 1998 72% 46% 53% 72% 71% 54% Walsh et al, 1997 Roesner etal, 2000 37% Higw ays Agency et al, 1998 H ydrocarbons Zinc TSS Lead Copper Luker and Montaque, 1994 Cadmium Rendement [%] US EPA, 2003 (mediaan) 74% total phosphorous 100 90 80 70 60 50 40 30 20 10 0 st of nitrate/nitr ogen rendement zuiveringstuw Eindhoven 100% Winer, 2000 Schueler, 2001 minimale waar de maximale w aarde gemiddelde waar de 90% rendement 80% 70% 60% 50% 40% 30% 20% 10% 0% S ti N it ra at to taa l (als N it N) ri e t (a ls N) fo sfo r (P ks to f ) to ta al Ca dm [N ] ium (C d) Ko pe r( Cu ) Lo od (P b) Nik ke l (N i) Zin k (Z n) Fe na nth re Flu en ora So nth m ee PA n K (V RO M ) -10% Did it meet the quality requirements? Permeable dike Oostzaan optimised Water is being stored in basin and discharged to watersystemen (<1,68 l/s/ha) through dike with olivijn/ lava dijk Titel presentatie 16 Tauw 12/4/2012 Permeable dike Oostzaan -0,6 WaterTown: Four Districts Waterstand achterin dijk [m geen referentie] Waterstand in voorziening [mNAP] Neerslag Schiphol (KNMI) WaterBurgh – integrated Wetley-Tetley – Pluvial planning flooding 250 -0,8 200 150 -1,2 -1,4 100 Neerslag [mm] Waterstand [m] -1 -1,6 98 50 -1,8 -2 30-7-2012 9-8-2012 0:00 0:00 19-8-2012 29-8-2012 0:00 0:00 8-9-2012 0:00 0 18-9-2012 28-9-2012 8-10-2012 18-1028-100:00 0:00 0:00 2012 0:00 2012 0:00 Datum/tijd Conclusions so far Egmond – political Bryggen – settlement of decisions historic buildings More info www.SKINTwater.eu/www.stowa.nl • Danmark-Holland have similar problems • Lets share 101 solutions (BMPs Danmark) • Word of advise: Keep it simple and effective • Involve stakeholders • Use international knowledge • Info available: • Database • Research reports • International papers • Data-stick Titel presentatie 17