Modeling and Optimization the treatment of the wastewater industrial from the hot-dip galvanizing by methodology of experimental design

Abstract

The objective of this study is to determine the optimal conditions of the operational parameters: type of flocculant (chitosan(s) and ferrocryl^®8723), dose of flocculant (0.1g/L at 0.5g/L) and pH (6 to 9) in the treatment of hot dip galvanizing effluents using coagulation/flocculation processes. The optimization of these parameters is done by the methodology of experimental design which allowed us to predict the optimal conditions. The concerned results, especially the theoretical operating parameters, allowed us to give a better reduction of the Zn²⁺and Cu²⁺ions in the optimal conditions namely: the pH of about 9, the type of flocculant is chitosan(s) with a dose of 0.2g/L.