Dataset on effect of dewatering treatment in geotubes on the geochemical behavior of dredged marine sediments from Carnon harbor, Occitanie region, southern France

Description

Dredging activities in France are essential from an environmental, economic or tourist point of view, but produce large quantities of dredged sediment which, since the law of June 28, 2016 (law for the blue economy) must be managed “on land” as waste. In 2023, the dredging of the Carnon harbor, located in the bay of Aigues Morte in Occitanie (southern France), generated 25,000 cubic meter of sediments, the fate of which falls to harbors managers who are looking for passive sustainable solutions for the management of these materials. Harbor dredged sediments followed a passive dewatering treatment system in Geotubes from February 2023 to January 2024. If the physicochemical composition in the sediment was determined on samples taken from the bottom of the water (before dredging) and in the air free (after dredging and disposal on land), today few data are available during the implementation of this treatment in geotubes. The objective was to monitor over time the effect of dewatering passive treatment in geotubes on the physicochemical behavior of sediments. Thus, sediment samples were carefully collected and analyzed in 2 geotubes from February 15, 2023 to January 17, 2024. All physicochemical composition parameters (pH, redox potential, conductivity, salinity, water content, concentrations of chlorides, sulfates , sodium, ammonium, potassium, calcium, magnesium and sulphides) of studied sediment samples were collected and subjected to analysis of variance and this analysis was carried out using the general linear model (GLM) procedure of the software XLSTAT version 2.0. Correlation analysis was performed using the Pearson correlation procedure found in XLSTAT. This dataset provides temporal varability of physicochemical composition data of dredged sediments during their dewatering treatment in geotubes. Opening this dataset is of great interest to researchers, harbors managers and stakeholders, engineer and agronomists seeking references for the reuse of these materials in a circular economy perspective. All of the data collected can be used to configure models to optimize the geotube treatment process, thus improving the land-based circular management of dredged marine sediments.

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