Evaluation of the effectiveness of the new couples Aluminum sulphate/PVAc and aluminum sulphate/PVAs in the clarification of wastewater: case of treatment of liquid effluents resulting from hot galvanization by coagulationflocculation

During this work, we treated the effluents from hot-dip galvanizing. For this we usedthe coagulation/flocculation process using aluminum sulphate as coagulant and flocculants which are PVAc and PVAs. From the results obtained, we observed that the effluent rate values of treated effluents were recorded at 96.18% for suspended solids, 98.35% for turbidity and 98.94% for conductivity (μs/cm), 98.38% of the chemical oxygen demand and 98.50% of the biochemical oxygen demand in the case of treatment with the aluminum sulphate/PVAs. However, treatment with the aluminum sulphate/PVAc, we obtained 95.83% removal for suspended solids, 98.17% for turbidity, 67.57% for conductivity (μs/cm), 98.48% for the chemical oxygen demand and 98.48% of the biochemical oxygen demand.