Fenton Process Optimization with Landfill Leachate in Janczyce as an Example

Abstract

One of the advanced oxidation methods is the Fenton's reaction which uses a mixture of iron(II) and hydrogen peroxide to generate hydroxyl radicals. The Fenton process efficiency is influenced by a number of factors including the pH, the Fe 2+ :H 2 O 2 relation or the Fe 2+ dose. The aim of the study was to optimize the Fenton method in the application for landfill leachate treatment, with the landfill in Janczyce (Świętokrzyskie Voivodeship) as an example. The sequence of determining the most advantageous conditions for the use of Fenton's reagent was as follows: A -the pH effect; B -the oxidation time effect; C -the Fe 2+ :H 2 O 2 relation effect; D -the Fe 2+ dose effect. The optimum catalyst/oxidant ratio of 0.125 was determined. The optimum process time of 90 minutes was determined. It was demonstrated that the Fenton process can be effectively carried out already at the pH of 4. A reduction by 75% for the TOC and by 89% for the COD, respectively, was obtained.

Response Surface Methodology (RSM)-Based Prediction and Optimization of the Fenton Process in Landfill Leachate Decolorization

“…As many as four steps and 20 runs per experimental set were involved in the screening phase (total runs: 80 with 2 k design, where k represents the number of variables). As suggested previously [16], in this present study, 2 k full factorial design was employed, where responses were measured from all combinations of the experimental factor levels. Preliminary four-steps full factorial design has been presented (Table 2).…”

“…Herein, we employed response surface methodology (RSM) which is a combination of mathematical and statistical techniques to study correlated factors in leachate treatment process and their optimization [15]. In comparison to conventional optimization methods, the RSM could provide much more information from only a small number of experiments performed [16]. In this study, the optimum conditions (reaction time, pH, and H 2 O 2 :Fe 2+ ratio, as well as Fe 2+ concentration) for landfill leachate decolorization by the Fenton process were determined.…”