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CASE STUDY. PORT SUSTAINABILITY: DREDGED MATERIAL MANAGEMENT

CASE STUDY. PORT SUSTAINABILITY: DREDGED MATERIAL MANAGEMENT. Contact: T.ANGEL DEL VALLS University of Cádiz UNESCO/UNITWIN7WiCop. Marine and Environmental Sciences Faculty Av. República Saharaui, s/n 11510-Puerto Real (Cádiz) SPAIN Phone: +34 956 01 6794 Fax: +34 956 01 6040

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CASE STUDY. PORT SUSTAINABILITY: DREDGED MATERIAL MANAGEMENT

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  1. CASE STUDY. PORT SUSTAINABILITY: DREDGED MATERIAL MANAGEMENT Contact: T.ANGEL DEL VALLS University of Cádiz UNESCO/UNITWIN7WiCop. Marine and Environmental Sciences Faculty Av. República Saharaui, s/n 11510-Puerto Real (Cádiz) SPAIN Phone: +34 956 01 6794 Fax: +34 956 01 6040 e-mail: angel.valls@uca.es

  2. Outline I • General description of the areas • Port of Cadiz; Huelva, Santos • Problem description • Solutions / measures • Effects and lessons learnt

  3. Description of the areas • Cadiz bay

  4. Description of the areas • Cadiz bay • Economy has been principally based on maritime commerce, fishing and ship construction as it hosts an important shipyard. • It is entry and exit door for merchant traffic from the European Union to the Magreb countries and also connects the Iberian penynsula with Canary Islands.

  5. Description of the areas • Huelva

  6. Description of the areas • Huelva • Important mining and metallurgical activities dating back three thousand years and based on pyrite (FeS2) and other sulphuric minerals. • Important industrial and fishing port with several dockyards and quays.

  7. Description of the areas • Santos

  8. Description of the areas • Santos • Biggest Brazilian industrial complex while major Latin American port. • Environmental importance: São Vicente Estuarine System surrounded by mangroves (43% of total mangrove area of São Paulo).

  9. Problem description • Dredging is an essential activity for maritime navigation: • Deepening navigable waterways • Maintenance dredging • sand and mud deposited by water currents • estuarine areas –high deposition of riverine sediments.

  10. Problem description Pose the sediments any risk to the environment? International framework of recommendations for dredged material characterisation and management. • London Convention • OSPAR • etc.

  11. Solutions and measures • Step 1: Project planning, including the nature and the scope of the activities, the potential dredged material placement options and the regulatory requirements. • Step 2: Initial evaluation, where available data is examined. It may lead to the conclusion that no further pre-dredging evaluations are needed. If needed, one proceeds to Step 3. • Step 3: Physical, chemical and biological characterizations of dredged material. • Step 4: Interpretation of results of the data assembled and evaluated.

  12. Solutions and measures • Traditional physico-chemical characterisation • Grain size/TOM • Metallic compounds –As, Cd, Cr, Cu, Hg, Ni, Pb, Zn • Organic compounds –Σ7PCBs • Not always required- Σ12PAHs • Comparison with limit values in use- • National Action Levels, i.e. Spain • Other empirically derived SQGs, i.e. TEL/PEL; ERL/ERM; etc.

  13. Solutions and measures Action Level Approach 8XAL2 AL1 AL2 No risk Evident risk ?

  14. Solutions and measures • Management requirements in Spain according to dredged material characterisation

  15. Solutions and measures • Ecotoxicological characterisation of sediment samples from Huelva, Cadiz and Santos Informs on the potential toxic effects of sediments on benthic infauna.

  16. Abnormal Normal Solutions and measures • Ecotoxicological characterisation of sediment samples from Huelva and Cadiz Informs on the potential toxic effects of aqueous extracts on pelagic organisms during dredging/disposal.

  17. Solutions and measures • Bioaccumulation potential of metals in commercial clams -Huelva and Cadiz- Informs on the potential bioaccumulation of compounds in commercial organisms/possible human health risks.

  18. Solutions and measures • Dredged sediments from Port of Cadiz

  19. Solutions and measures • Dredged sediments from Port of Huelva

  20. Solutions and measures • Dredged sediments from Port of Santos Further information on potential toxicity would allow to identify least detrimental management option.

  21. Integrated approach for dredged material management (CHEMICAL+ECOTOXICOLOGICAL): - + Costs of characterisation: Only for not-completely characterised sediments -categoría II-. Environmental benefits: Risk-based decisions. Economic benefits: Re-use of contaminated but not toxic sediments Management costs: For intermediate contaminated sediments causing toxicity.

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