Modeling of Fenton Reaction for the Oxidation of Phenol in Water

Olivier Chedeville,Ayse Tosun-Bayraktar,Catherine Porte

doi:10.1155/jammc.2005.31

Abstract

Phenol is an organic pollutant found in various types of industrial wastewater. Due to its bactericidal properties, it is difficult to eliminate it by classic treatment methods. In this work, the degradation of this compound by Fenton reaction at mild temperature and pressure conditions is studied. An experimental design was applied in order to quantify the influence of operating parameters on the efficiency of this method. The field of study was defined between 20 and 50^C for the temperature, 1 and 4 g L-1 for the phenol concentration, 10 and 28 for the H2O2 to phenol molar ratio, and 0.02 to 0.08 for the Fe(II) to phenol concentration ratio. It was shown that the temperature and the amount of catalyst have a strong influence. A model giving the decrease of COD was established. The COD decrease was between 40% and 72% and phenol had totally disappeared.

Highlights

During its use in industrial processes, water may be polluted by different compounds
The aim of this study is to quantify the influence of these parameters by modeling the efficiency of the reaction measured by chemical oxygen demand (COD) decrease, expressed in percentage
First a series of experiments was conducted to determine the limit duration of the reaction: it seems that after two hours, while the reaction was as slow as possible the COD value (Figure 2) does not change

Summary

Introduction

During its use in industrial processes, water may be polluted by different compounds. The effluents must be treated before dumping to limit the environmental impact. Some compounds are difficult to eliminate because of their high chemical stability and/or their high concentration. Phenol, which is largely used in chemical industry, is one of these compounds. In France, phenol in liquid effluents amounted to 54 tons in 2000 [1]. In addition to its organoleptic properties (it gives a characteristic taste and odor to water even at low concentrations), it is a bactericide. Its treatment by classic water treatment methods (including a biological treatment step) is difficult at high concentrations. Thermostatic fluid [Phenol] (g L−1) COD decrease (%) Peristaltic pump H2 O2 Draining system Time (min).

Objectives

Methods

Results

Discussion

Conclusion