Effect of forced aeration on the biogeochemical cycle of nutrients and metal(loid)s as a remedy for hypoxia in a permanently stratified estuary (Gulf of Trieste, northern Adriatic Sea).
Mar Pollut Bull
; 205: 116632, 2024 Aug.
Article
en En
| MEDLINE
| ID: mdl-38943896
ABSTRACT
The Timavo River estuary (northern Adriatic Sea) is characterised by strong thermohaline stratification that keeps the deep waters hypoxic. The consequence is an harmful algal bloom at the surface in summer that can be mitigated with a forced aeration system installed at the bottom to improve water oxygenation. The nutrient and metal(loid) cycle was investigated, before and during reoxygenation, using an in situ benthic chamber coupled with sampling and analyses of the water column, sediments and porewater. Dissolved oxygen (DO) decreased along the water column and quickly within the benthic chamber when aeration was not in operation, resulting in hypoxia (2.29 mg L-1) at the bottom and consequent increase in nutrient and metal(loid) concentrations. In contrast, DO levels increased during the activation of the forced aeration system, which proved effective in mitigating oxygen depletion and the efflux of metal(loid)s and nutrients into the overlying water.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Oxígeno
/
Contaminantes Químicos del Agua
/
Estuarios
/
Metales
Idioma:
En
Revista:
Mar Pollut Bull
Año:
2024
Tipo del documento:
Article