Noureddine Hamdi

The aim of this study was to optimize several parameters that affect the Electrocoagulation (EC) process of Cadmium (Cd) from polluted wastewater. To estimate the contribution of each parameter to the overall removal process, an experimental design methodology was employed. System performance was optimized using Response Surface Methodology (RSM), focusing on key factors, such as pH, amperage, and salt (NaCl) concentration. Minitab 19 software was utilized to develop a full model equation, including the main effects and interactions between the variables. The analysis revealed that pH and amperage were the most influential factors, contributing 43.04% and 26.27%, respectively, to system efficiency. The optimal parameter range for achieving a yield (above 95%) was identified through response contour plots and interaction analyses: pH ranged between 6.9 and 11, amperage between 300 and 500 mA, and salt concentration between 0.1 and 0.6 g/L. Further refinement of these ranges was visualized using response surface diagrams and the Box-Behnken design. Practical experiments were conducted using the optimized values (pH = 6.2, amperage = 280 mA, salt = 0.46 g/L), and the results were compared to the theoretical model. A minimal error margin of less than 2% between the practical and statistical results validated the model's accuracy.

In this study, the removal of Diclofenac sodium (DIC) from water medium was performed using synthetic FAU-X zeolite. The zeolitic material has been synthes

This paper reports the interaction between clay and acidic wastewater (pH = 2.7 and rich in F⁻, PO ₄ ³⁻ , Cl⁻, etc.). However, this work investigates the structural and textural evolution after the leachate permeability test of clay soils from three potentials sites for acid effluents storage in the south of Tunisia (soil 1, soil 2, and soil 3). We can notice that the coefficient of permeability decreases according to the time in the case of soil 1 and soil 2 and increase from 6.8 × 10⁻¹⁰ to 1.1 × 10⁻⁸ m/s for soil 3. The textural changes for the three varieties of clay soils obtained after the leachate permeability test were studied through nitrogen gas adsorption at liquid nitrogen temperature; we determined the specific surface areas (SBET) and total pore and micropore volume. The textural study data have indicated that soil 1 had the lowest textural properties with a pore volume in the 0.06–0.09 cm³ g⁻¹ ranges and with a surface area (SBET) varying between 35.4 and 47.4 m² g⁻¹. A detailed structural and morphologic modification were undertaken by scanning electron microscopy (SEM) equipped with energy-dispersive spectroscopy (EDS); their results show that soil 1 and soil 2 are able to uptake the noxious elements. By comparison, the selectivity of the elimination of these elements is in the order F > P > S for soil 1. The quantitative analysis of anions shows that the sorption capacity of fluoride for soil 1 is about 60 mg/g and is much higher compared to others anions.