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Environmental risk assessment policy and developments in the Netherlands

This seminar presentation discusses accidents and follow-up, with a focus on surface water risks, risk assessment developments, and the use of Proteus software. It also explores criteria for environmental risk and the implementation of "Best safety practice" to avoid surface water risks.

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Environmental risk assessment policy and developments in the Netherlands

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  1. Environmental risk assessment policy and developmentsin the Netherlands Gerard Harmsen Institute for Inland Watermanagement and Waste Water Treatment (RIZA) Ministry of Transport, Public Works and Water Management Seminar CCA Seveso Matalascañas april 2002

  2. Overview • Accidents and follow up • Focus on surface water • Risk assessment developments • Proteus software • criteria for environmental risk Seminar CCA Seveso Matalascañas april 2002

  3. Accidents • Sandoz • Several yearly unforeseen discharges Seminar CCA Seveso Matalascañas april 2002

  4. Risk identification Risk assessment Risk criteria Control measures Risk management Enforcement Seminar CCA Seveso Matalascañas april 2002

  5. Why focus on surface waterrisks • spills lead directly to consequences for the environment • pollution disperses rapidly • many establishments are located near surface water Seminar CCA Seveso Matalascañas april 2002

  6. Seveso sites at surface water ~ 50% of the article 9 sites are at surface water Seminar CCA Seveso Matalascañas april 2002

  7. What can cause surface water risks e.g. • Chemicals & pesticides storages fire • petroleum products storages leakages • unloading spills without bunds • process upsets/LOCs • waste water treatment Seminar CCA Seveso Matalascañas april 2002

  8. Implementation of “Best safety practice” Modelling of remaining risk Reviewing of the calculated risks Policy Seminar CCA Seveso Matalascañas april 2002

  9. “Best safety practice” • Prevention • Precautionary principle • like the approach for regular discharges Seminar CCA Seveso Matalascañas april 2002

  10. Avoiding surface water risks • design & maintenance • process control • avoid leakages (tanks, unloading) • closed bunds • sewerage systems • safe storage • early fire alarm • catchment basin • waste water treatment Seminar CCA Seveso Matalascañas april 2002

  11. Example Safe storage of chemicals • compartments • separation • flammable from toxic • oxidizers, acids, reacting • (in) compatibility lists • early fire detect and intervention (sprinklers) • foam vs. water • fire water catchment Seminar CCA Seveso Matalascañas april 2002

  12. Report “Best safety practice” • general procedures and facilities • specific activities: • bulk transfer • batch processes • storage • type of activity, nature of risks, description of best practice, references Seminar CCA Seveso Matalascañas april 2002

  13. “Best safety practice” Modelling of remaining risks reviewing of the calculated risks Policy Seminar CCA Seveso Matalascañas april 2002

  14. Elements of risk assessment for surface water • chemicals toxicity etc. • presence and use in the establishment • possible spill pathways • safety management influence • safety measures • type of surface water Seminar CCA Seveso Matalascañas april 2002

  15. Model for aquatic risk assessment PROTEUS • safety management influence • type of surface water • absolute risks • only applicable on inland water Seminar CCA Seveso Matalascañas april 2002

  16. Proteus (basic) Overflow Primary containment Buffering Drain Seminar CCA Seveso Matalascañas april 2002

  17. initialQMFT * * * management generic QMFT technical performance Proteus (risk calculation) Seminar CCA Seveso Matalascañas april 2002

  18. management • Areas of influence • safety management systems • skills of operators • working procedures • efficiency of repression • distinctive characterisations Seminar CCA Seveso Matalascañas april 2002

  19. risk discharge * initialQMFT catchmentand treatment Proteus (risk calculation) specific conditions Seminar CCA Seveso Matalascañas april 2002

  20. Effect calculation • surface water • toxicity, deoxygenation, formation of floting layers • modelling watersystems • conservative behaviour of substances • concentrationcalculations on Gausses dispersion equation • Communal waste water treatment • overloading and inhibition Seminar CCA Seveso Matalascañas april 2002

  21. Proteus (results) • frequency-consequence curves • volume contaminated surface water • failure of communal waste water treatment • quantity of fire extinguish water • automatically generated report Seminar CCA Seveso Matalascañas april 2002

  22. Proteus (results) frequency consequence Seminar CCA Seveso Matalascañas april 2002

  23. Proteus • windows application (3.11, 95, 98) • database properties chemicals (serida) • default values standerd scenarios • free off charge • Update end of 2002 Seminar CCA Seveso Matalascañas april 2002

  24. “Best safety practice” Modelling of remaining risks reviewing of the calculated risks Policy Seminar CCA Seveso Matalascañas april 2002

  25. Environmental Harm Index • EHI = (Vow/Vref) * Fws • EHI = Environmental Harm Index • Vow = volume contaminated surface water • Vref = referentievolume (based on Sandoz) • Fws = correction factor for vunerability of the surface waters Seminar CCA Seveso Matalascañas april 2002

  26. Proteus (results) frequency consequence Seminar CCA Seveso Matalascañas april 2002

  27. Proteus (evaluation)a proposal Intolerable Acceptable Negligilble Seminar CCA Seveso Matalascañas april 2002

  28. Download from: www.riskanalysis.nl/proteus published in: J.Hazardous materials 61 p.371-374 (2000) G.J. Stam, P.H. Bottelberghs, J.G. Post, H.G. Bos “Environmental risk: towards an integrated assessment of industrial activities” G.Harmsen@riza.rws.minvenw.nl Seminar CCA Seveso Matalascañas april 2002

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