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).

Autor: Pavoni E; Department of Mathematics, Informatics and Geosciences, University of Trieste, Via E. Weiss 2, 34128 Trieste, Italy. Electronic address: epavoni@units.it., Floreani F; Department of Mathematics, Informatics and Geosciences, University of Trieste, Via E. Weiss 2, 34128 Trieste, Italy., Petranich E; Department of Mathematics, Informatics and Geosciences, University of Trieste, Via E. Weiss 2, 34128 Trieste, Italy., Crosera M; Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, 34127 Trieste, Italy., Marussi G; Department of Chemical and Pharmaceutical Sciences, University of Trieste, Via Licio Giorgieri 1, 34127 Trieste, Italy., Acquavita A; Agenzia Regionale per la Protezione dell'Ambiente (Arpa FVG), Via Cairoli 14, Palmanova 33057, Italy., Pisoni C; Department of Mathematics, Informatics and Geosciences, University of Trieste, Via E. Weiss 2, 34128 Trieste, Italy., Klun K; National Institute of Biology, Marine Biology Station, Fornace 41, 6330 Piran, Slovenia., Faganeli J; National Institute of Biology, Marine Biology Station, Fornace 41, 6330 Piran, Slovenia., Covelli S; Department of Mathematics, Informatics and Geosciences, University of Trieste, Via E. Weiss 2, 34128 Trieste, Italy.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2024 Aug; Vol. 205, pp. 116632. Date of Electronic Publication: 2024 Jun 28.
DOI: 10.1016/j.marpolbul.2024.116632
Abstrakt: 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.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023. Published by Elsevier Ltd.)
Databáze: MEDLINE
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