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Operational decision support system for large combined sewage systems: Lisbon/Tagus estuary case study.

P Póvoa1, A Nobre1, P Leitão2

  • 1Simtejo, ETAR de Alcântara, Av. de Ceuta, 1300-254 Lisboa, Portugal

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 15, 2015
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Summary

An operational decision support system (ODSS) empowers non-expert wastewater staff to analyze sewage discharge impacts using computational fluid dynamics. This enhances decision-making and reduces negative effects on coastal waters.

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Area of Science:

  • Environmental Engineering
  • Water Resource Management
  • Computational Fluid Dynamics

Background:

  • Managing combined sewage discharges into coastal waters is complex, especially in urban areas with recreational activities.
  • Effective impact assessment requires sophisticated hydrodynamic and water quality models, often needing expert operation.
  • Decision support tools are crucial for simulating discharge impacts and devising mitigation strategies.

Purpose of the Study:

  • To develop an operational decision support system (ODSS) methodology for non-expert wastewater utility staff.
  • To enable user-friendly scenario analysis of combined sewage discharge impacts using computational fluid dynamics (CFD).
  • To apply and validate the ODSS for the Lisbon combined sewage system and Tagus estuary.

Main Methods:

  • Development of an Operational Decision Support System (ODSS) methodology.
  • Integration of computational fluid dynamics (CFD) simulations for scenario analysis.
  • Application and validation of the ODSS to the combined sewage system of Lisbon, Portugal.

Main Results:

  • The ODSS enables non-expert staff to conduct user-friendly scenario analyses of sewage discharge impacts.
  • Simulations were performed for a discharge event during scheduled maintenance in Lisbon's sewage infrastructure.
  • The system was successfully applied and validated for the Tagus estuary receiving waters.

Conclusions:

  • The ODSS enhances the decision-making capabilities of wastewater utility staff without specialized modeling expertise.
  • It improves understanding of the utility's role in mitigating negative impacts of sewage discharges.
  • The methodology facilitates better management of combined sewage discharges into sensitive coastal environments.