Optimization Study of the Treatment of Residual Waters of hot-dip Galvanization by the Process of Coagulation/Floculation according to the Couples (lime Ca (OH)2/ferrocryl®8723) and (lime Ca(OH)2/ polyvinylalcool) "

Abstract

The treatment of wastewater from the technique of hot dip galvanizing was done in this study by the coagulation/flocculation process. The optimization of this process showed that the physicochemical and biological parameters indicating the degree of pollution were recorded in the following abatement rate: 67.76% for conductivity, 98.30% for turbidity, 96.14% for suspended solids, 98.28% for the chemical oxygen demand and 98.68% for the biochemical oxygen demand in the case of treatment with couples lime/polyvinyl alcohol. However those obtained during treatment with couples lime/ferrocryl^®8723 that is used in the neutralization station Galvacier the Company are recorded in the following values: 50.18% for conductivity, 98% for turbidity, 95.78% for materials suspension, 98.18% for the chemical oxygen demand and 98.36% for the biochemical oxygen demand. According to the results of this study, we showed that treatment of waste water by the technique of hot dip galvanizing is more efficient at using the new couples lime/polyvinyl alcohol compared to couples lime/ferrocryl^®8723.