Using of Fenton advanced oxidation method for treatment of oily-contaminated wastewater

Abstract

Today, water is one of the most important human concerns, especially in arid areas. One of the things that can be recycled to turn it into water used for industrial or agricultural purposes and also prevent the entry of very harmful pollutants into nature, is the treatment of wastewater containing oil pollutants. In this study, the advanced oxidation process using the Fenton method was used as a new chemical treatment method. In the Fenton treatment process, the pH of the reaction, the concentration of iron (II) catalyst, the oxidizing concentration of hydrogen peroxide and the reaction time are the four main parameters that determine the treatment efficiency. Therefore, to achieve the desired efficiency and minimize the cost of treatment, the optimal value of each parameter should be determined. The results showed that the best pH for the Fenton method in removing turbidity and COD at pH equal 3 and the highest removal efficiency of COD and turbidity in catalyst concentration of 250 mg/L, the oxidizing concentration of 500 mg/L and reaction time of 40 minutes were obtained with values of 89% and 95%, respectively, which were selected as the optimal conditions. Also, the study of kinetic models to find the reaction rate showed that the Behnajady – Modirshahla – Ghanbery (BMG) kinetic model is more consistent than the pseudo-first-order and pseudo-second-order kinetic models and has a correlation coefficient of 0.9938. As a result, the Fenton process can be used as a treatment for petroleum-containing effluents.

Keywords

• oily-contaminated wastewater
• chemical treatment
• advanced oxidation
• fenton