INVESTIGATION OF THE EFFECT OF PROCESS PARAMETERS ON THE COAGULATION-FLOCCULATION TREATMENT OF TEXTILE WASTEWATER USING THE TAGUCHI EXPERIMENTAL METHOD

The aim of the study is to determine the optimum values for chemical coagulation such as initial pH, coagulant concentration, slow mixing rate, rapid mixing rate, initial wastewater concentration and coagulant aid concentration on color and turbidity removal by using the Taguchi method. The contribution ratios of each operating parameters on color and turbidity removals were determined by the analysis of variance (ANOVA). The optimum results were found to be: pH 9, coagulant dosage = 400 mg/L, slow mixing rate=15 rpm, rapid mixing rate=60 rpm, initial wastewater concentration = 1/4 diluted and polyelectrolyte dosage=1 mg/L for color removal and pH 9, coagulant dosage = 400 mg/L, slow mixing rate = 45 rpm, rapid mixing rate = 150 rpm, initial wastewater concentration = 1/4 diluted and polyelectrolyte dosage = 2 mg/L for turbidity removal.