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Modeling the Praia dos Ingleses submarine outfall, Florianópolis, Santa Catarina, Brazil
J L B Carvalho1, A Trevisan, V Santos
1Univerisity of Vale do Itajaí, Rua Uruguai, 458. Itajaí-SC. 88.203-202, Brazil. carvalho@univali.br
Summary
The study found that an extended 3,300m ocean outfall is necessary for treated wastewater effluent from Praia dos Ingleses beach to meet environmental standards. Initial dilution models were insufficient, highlighting the need for better phosphorus reduction at the treatment plant.
Area of Science:
- Environmental Engineering
- Oceanography
- Water Quality Management
Background:
- A proposed 1,800m outfall for treated domestic wastewater from Praia dos Ingleses beach was evaluated.
- Effluent discharge flow rates were estimated at 0.1543 m³/s for the summer season.
Purpose of the Study:
- To assess the near-field and far-field impacts of treated wastewater effluent discharge.
- To determine the optimal length and location for an ocean outfall to ensure compliance with environmental regulations.
Main Methods:
- Near-field dilution was modeled using the NRFIELD model with site-specific current and density data.
- Far-field plume dispersion was simulated using a Lagrangian advective-diffusive model.
- Hydrodynamic modeling incorporated field data on water level, wind, and currents.
Main Results:
- Initial diffuser design maximized dilution but indicated a need for enhanced phosphorus removal at the treatment plant.
- Far-field modeling revealed that the initial outfall length was insufficient to prevent plume impact.
- An extended outfall of 3,300m was proposed as a necessary modification.
Conclusions:
- The treatment plant requires design modifications to prioritize total phosphorus reduction.
- An increased ocean outfall length is essential for effective wastewater effluent management and environmental protection.
- The proposed 3,300m outfall location aims to ensure compliance with water quality standards.
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