Treatment of Polyaniline Wastewater by Fenton Reagent

Abstract

This paper describes a simple method using Fenton reagent for treating the wastewater from the preparation of polyaniline. The method employs the absorption of UV-visible spectroscopy as a quantitative indicator of the byproducts. Some factors e.g., reactive time, temperature, pH and the concentration of FeSO₄·7H₂O and H₂O₂ were investigated. The study shows that the optimum conditions for treating the wastewater were the 1:1 concentration ratio of FeSO₄·7H₂O to H₂O₂, reaction time 50 min, temperature 19 ºC, pH 1.1. After the Fenton process, some solid CaCO₃ and active carbon were used to obtain near-neutral and colourless water. The experimental results demonstrated that the chemical oxygen demand (COD) value of water sample is 1512 and 56 mg L^-1 for pre- and post-treatment, respectively. The removal efficiency of the COD is more than 96 %.