Publications internationales
Résumé: The scarcity of freshwater resources in the transboundary region of Sidi Fredj, located in the Souk Ahras province (northeastern Algeria), is exacerbated by the high salinity of groundwater, which exceeds 5 g/L. This elevated salinity is primarily attributed to the leaching of Triassic formations rich in gypsum and evaporites. To meet the growing demand for drinking water, two reverse osmosis desalination plants have been commissioned, supplied by boreholes AOB2 and AZ2. However, the brine discharges generated by these treatment units pose a potential threat to the receiving aquatic environments. This study aims to assess the impact of brine discharges on the water quality of two receiving streams: Oued Mellègue and Oued El Maleh. The adopted approach is based on a comparative monitoring of key physicochemical parameters, including temperature (T), hydrogen potential (pH), electrical conductivity (EC), total dissolved solids (TDS), and concentrations of sodium (Na+), chloride (Cl−), and sulphate (SO42−), both in the brine effluents and in the stream waters. A bimonthly monitoring campaign was conducted to evaluate the temporal variation of selected indicators (EC, Cl−, SO42−) upstream and downstream of the discharge points. The results reveal a significant increase in the mineralization of water in the receiving streams, directly linked to the brine effluents, specifically, Electrical Conductivity (EC), total dissolved solids (TDS), sodium (Na+) and chloride (Cl−), the results indicate that Electrical conductivity (EC) increases from 3500 to 6500 µS/cm upstream to values ranging between 3600 and 7100 µS/cm downstream, reflecting a rise in salinity attributable to brine discharges. Multivariate statistical analysis supports these findings and identifies sulphate as the primary contributor to the mineral load in the impacted waters. These results indicate a marked deterioration in surface water quality, with exceedances of Algerian water quality standards, suggesting a potential risk to local aquatic ecosystems. Further ecological investigations, including biological assessments, are needed to confirm this hypothesis.
Résumé: The purpose of this study is to understand the hydrogeochemical functioning of the waters of the transboundary aquifer system of the Medjerda. This will ensure the sustainability of the region's water resources in the face of increased demand from high socio-economic growth coupled with anthropogenic pollution and the hazards of climate change. The transboundary watershed of the Medjerda River, which is of great importance in relation to its geographical location, is considered vital for Tunisia, thus offering about half of the fresh water available in the country. This basin drained by the Medjerda wadi has a set of aquifers characterized mainly by the deep aquifers of the karstified limestones of the Maestrichtian, Campanian and Turonian periods, as well as alluvial formations of the Mio-Plio-Quaternary age. The processing of data obtained from physico-chemical analyses carried out on aquifer waters was carried out using multivariate hydrochemical and statistical methods. The results reveal the dominance of the bicarbonate facies resulting from the dissolution of the limestone formations that predominate in the Taoura syncline. It should also be noted that other chemical facies such as calcium sulphate, calcium chloride and sodium chloride are present due to the presence of evaporite formations on the edge.
Communications internationales
Résumé: Natural mineral water is characterized by its underground and protected origin, sound microbiology and stable mineralization, which can give it beneficial health effects. The object of this study is the physico-chemical characterization and classification of non-gaseous mineral water bottled and marketed in Algeria, by analyzing the characteristic ratios of the major elements, The analysis of the Piper, Stabler, Ascending Hierarchical Classification, (AHC) and Principal Component Analysis (PCA) analysis allowed to characterize the mineral water from bottled sources in Algeria, to identify Many...
Résumé: Le complexe sidérurgique d’El-Hadjar comme toute activité industrielle, consomme des quantités énormes d'eau qui rentrent dans les différents circuits de refroidissement des équipements et des installations des unités de production. Toutes ces unités génèrent de grandes quantités de rejets liquides chargés en polluants, tels que les MES, les ETM, des carburants, des graisses et des huiles en émulsions..., en concentrations variables vers un milieu récepteur, l'Oued Meboudja sans traitement préalable, menaçant ainsi l’équilibre écologique de l’écosystème. L'objectif de cette étude est de quantifier les débits des rejets liquides et suivre la variation des paramètres de pollution dans la station PR6, lieu de déversement des différentes unités de production sidérurgiques du complexe.