Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Doctorat → Italie → Study of Sicilian Surface Freshwater Catchments for Environmental and Peoples Risk Assessment

Università di Catania (2019)

Study of Sicilian Surface Freshwater Catchments for Environmental and Peoples Risk Assessment

Zuccarello, Pietro

Titre : Study of Sicilian Surface Freshwater Catchments for Environmental and Peoples Risk Assessment

Auteur : Zuccarello, Pietro

Université de soutenance : Università di Catania

Grade : Dottorato di Ricerca in Scienze Geologiche, Biologiche e Ambientali 2019

Résumé partiel
Due to the population growth, urbanization and economic development, demand for freshwater in urban areas is increasing throughout Europe. At the same time, climate change and pollution are also affecting the availability of water supplies. Sicily, a southern island of Italy, suffers from a growing strong water scarcity and drought. The freshwater basins of Sicily are not well characterized and classified. In last decades, in Sicilian freshwater surface reservoirs several Planktothrix rubescens and Microcystis aeruginosa blooms have reported. A further actual worldwide problem for all surface freshwaters basins is the increasing of heavy metals concentrations in their waters. Aims of this research doctoral project were : a) perform a census of Sicilian natural and artificial freshwater basins and identify which of these are suitable for use for drinking purposes ; b) carry out a risk assessment related to presence of Microcystins and heavy metals (As, Pb, V, Cd, Al) ; c) evaluate the waters toxicity through ecotoxicological bioassays and verify if they would be sensitive and reliable to investigate on toxicity of mixtures of heavy metals and Microcystins. It was carried out the monitoring of 15 surface basins, among the 30 existing in Sicilian territory, through seasonal chemical, physical and microbiological analysis of the waters such as required by Italian law, the Legislative Decree 152/2006. Moreover, it was performed speciation of cyanobacteria community, cell counting, and PCR analysis. Finally, it was carried out acute (V. fischeri), subacute (T. platyurus) and chronic (D. magna) ecotoxicological assays. There is much reassurance about quality chemical status of basins. In fact, there are no heavy metals above the reference values. Only Aluminum and Iron are present often in large concentration. The high levels of total nitrogen and phosphorus give information about the inflow of partially or completely untreated urban and rural wastewater in all basins

Présentation

Version intégrale (3,3 Mb)

Page publiée le 29 avril 2020