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Subtitel Marlea Wagelmans, Wageningen, 1 December  2011. Risk assessment at work and challanges for the future
Contents <ul><li>Risk Assessment in the Netherlands </li></ul><ul><li>Examples </li></ul><ul><li>Bottlenecks </li></ul><ul...
Risk assessment in the Netherlands Step 2: Model (Sanscrit): total concentrations Step 3: Site specific risk assessment (e...
Example: River Bank <ul><li>Tidal river, banks uncovered during low tide </li></ul><ul><li>Important natural values, reed ...
Activities  <ul><li>Chemical analyses </li></ul><ul><li>Bioavailability PAH </li></ul><ul><li>Biodegradation tests PAH and...
Details Triad activities Tidal zone Reed zone Chemistry Chemical analyses sediment Chemical analyses soil Bioaccumulation ...
Results PAH availability
Results biodegradation tests Anaerobic test Aerobic tests
Results Triad approach activities Tidal zone Reed zone Chemistry High concentrations metals, PAH and PCB Moderate concentr...
Summarizing
Remediation options Wet and tidal zone Remediation (dredging or enhanced bioremediation  Dry zone Natural attenuation
Example 2: Former military airport  <ul><li>PAH (volume > 2.000 m 3 ) </li></ul><ul><li>Nature area, within EHS </li></ul>...
Triad
Results chemistry PAF = Potentially Affected Fraction chemistry toxicology ecology parameter unit 7 8 10 13 14 16 PAH mg/k...
Toxicology and ecology <ul><li>No negative effects Microtox </li></ul>Nitrification Nematodes chemistry toxicology ecology
Summary R= Triad risk value D= deviation  RIVM rapport 607711003/2011 R < 0,25 R > 0,25 D > 0,40 BC14 BC7 BC16 BC10 BC13 B...
Summary <ul><li>High concentrations PAH </li></ul><ul><li>PAH not available </li></ul><ul><li>No effects toxicology </li><...
Challange for the future  <ul><li>detailed information about effects on functioning or system level </li></ul><ul><li>deta...
Conclusions <ul><li>Effective in ecological risk assessment </li></ul><ul><li>Identify management options </li></ul><ul><l...
Thanks for your attention
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NBV Marlea Wagelmans

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Presentation at NBV symposium about ecological risk assessment

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NBV Marlea Wagelmans

  1. 1. Subtitel Marlea Wagelmans, Wageningen, 1 December 2011. Risk assessment at work and challanges for the future
  2. 2. Contents <ul><li>Risk Assessment in the Netherlands </li></ul><ul><li>Examples </li></ul><ul><li>Bottlenecks </li></ul><ul><li>Conclusions </li></ul>
  3. 3. Risk assessment in the Netherlands Step 2: Model (Sanscrit): total concentrations Step 3: Site specific risk assessment (ecology=Triad) Step 1: Soil research > Intervention values Volume > I
  4. 4. Example: River Bank <ul><li>Tidal river, banks uncovered during low tide </li></ul><ul><li>Important natural values, reed vegetation </li></ul><ul><li>Contaminated sediment, PAH, mineral oil, metals </li></ul><ul><li>Traditional dredging loss of natural values </li></ul>
  5. 5. Activities <ul><li>Chemical analyses </li></ul><ul><li>Bioavailability PAH </li></ul><ul><li>Biodegradation tests PAH and mineral oil (aerobic) and PCB (anaerobic) </li></ul><ul><li>Triad (top) </li></ul>3 rows, 3 sampling points per row (wet, tidal and dry zone), 3 depths per point Dry Tidal Wet R3A R2A R1A R3C R2C R1C R3E R1E R2E
  6. 6. Details Triad activities Tidal zone Reed zone Chemistry Chemical analyses sediment Chemical analyses soil Bioaccumulation tubifex Toxicology Microtox Microtox Daphnia magna test Plant test Chironomus riparius test Earthworm test Ecology Nematodes Nematodes Macrofauna Earthworm population
  7. 7. Results PAH availability
  8. 8. Results biodegradation tests Anaerobic test Aerobic tests
  9. 9. Results Triad approach activities Tidal zone Reed zone Chemistry High concentrations metals, PAH and PCB Moderate concentrations metals, PAH and PCB Risks on bioaccumulation of lead, cadmium and chromium Toxicology Negative effects bacteria No effects bacteria No effects Daphnia magna No effects plant test No effects Chironomus riparius test No effects earthworm test Ecology Negative effects nematodes Moderate effects nematodes Negative effects macrofauna No effect on earthworms Summary Negative effects, not acceptable Moderate effects, acceptable
  10. 10. Summarizing
  11. 11. Remediation options Wet and tidal zone Remediation (dredging or enhanced bioremediation Dry zone Natural attenuation
  12. 12. Example 2: Former military airport <ul><li>PAH (volume > 2.000 m 3 ) </li></ul><ul><li>Nature area, within EHS </li></ul><ul><li>Origin: possibly tar and rubber, maybe also debris </li></ul><ul><li>Ecological risk (Sanscrit) </li></ul>
  13. 13. Triad
  14. 14. Results chemistry PAF = Potentially Affected Fraction chemistry toxicology ecology parameter unit 7 8 10 13 14 16 PAH mg/kg dw 34 990 92 170 7 59 PAF total % 60 100 96 100 59 82 PAF available % 0 0 0 0 0 0 > Intervention value
  15. 15. Toxicology and ecology <ul><li>No negative effects Microtox </li></ul>Nitrification Nematodes chemistry toxicology ecology
  16. 16. Summary R= Triad risk value D= deviation RIVM rapport 607711003/2011 R < 0,25 R > 0,25 D > 0,40 BC14 BC7 BC16 BC10 BC13 BC8 Chemistry Toxic pressure 0,06 0,34 0,48 0,57 0,71 0,95 Availability 0,0 0,0 0,0 0,0 0,0 0,0 Judgement 0,03 0,18 0,28 0,34 0,46 0,77 Risk assessment Chemistry 0,03 0,18 0,28 0,34 0,46 0,77 Toxicology 0,0 0,0 0,0 0,0 0,0 0,0 Ecology 0,0 0,01 0,07 0,0 0,07 0,0 R 0,01 0,07 0,10 0,13 0,19 0,39 D 0,03 0,18 0,28 0,34 0,40 0,76
  17. 17. Summary <ul><li>High concentrations PAH </li></ul><ul><li>PAH not available </li></ul><ul><li>No effects toxicology </li></ul><ul><li>No effects ecology </li></ul><ul><li>No urgent remediation needed </li></ul>
  18. 18. Challange for the future <ul><li>detailed information about effects on functioning or system level </li></ul><ul><li>detailed information about the cause of effects </li></ul><ul><li>efficient in acute and chronic pollution situation </li></ul><ul><li>micropollutants: new endpoints? </li></ul>Molecular tools
  19. 19. Conclusions <ul><li>Effective in ecological risk assessment </li></ul><ul><li>Identify management options </li></ul><ul><li>Still some bottlenecks: biotechnology? </li></ul>
  20. 20. Thanks for your attention

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