Optimization of TiO2/Fe(III)/solar UV conditions for the removal of organic contaminants in pulp mill effluents

Solar degradation of effluents of pulp mill industry containing toxic chemicals has been studied using TiO2/Fe(III) (Degussa P25 TiO2 was used as a catalyst). Effects of some operating parameters such as the initial oxidant and catalyst concentrations and circulation rates of wastewater on TOC, color and AOX removals were investigated using the Box–Wilson statistical experimental design method. The highest color, TOC and AOX removals of 78%, 64% and 68% were obtained at TiO2 concentration of 188 mg/L and Fe (III) concentration of 0.5 mM, respectively.