Name: | Description: | Size: | Format: | |
---|---|---|---|---|
9.02 MB | Adobe PDF |
Advisor(s)
Abstract(s)
This study aimed to assess the influence of treated wastewater disposal on Ria Formosa coastal lagoon (South
Portugal), the largest national producer of bivalve mollusks. Water quality was evaluated at two areas under
different wastewater loads and hydrodynamic conditions, using physico-chemical variables, bacterial indicators
of contamination, chlorophyll-a concentration, phytoplankton abundance and composition. Samples were
collected monthly, between October 2018 and September 2019. Minor influence of effluent discharge was
detected at the eastern Olhao ˜ area, exposed to stronger hydrodynamics and higher wastewater load than the
northwestern Faro area (ca. 2–4-fold total nitrogen and phosphorus). The lower load weakly flushed area showed a poorer water quality, up to 500 m from the discharge point, more marked during the spring-summer period.
The intensity, persistence, and spatial extent of the wastewater footprint, lower for the highest-loading area,
reflected the role of local hydrodynamic conditions, modulating the influence of wastewater discharge on
lagoonal water quality.
Description
Keywords
Coastal lagoons Water quality Bivalve quality Wastewater discharge influence Phytoplankton Faecal contamination
Citation
Publisher
Pergamon - Elsevier