Central composite design for the optimization of removal of the azo dye, methyl orange, from waste water using fenton reaction

Abstract

In this study the degradation of Methyl Orange, using Fenton reaction was studied and optimized using central composite design as a response surface methodology. The effects of various experimental parameters in this reaction were investigated using central composite design. 28 experiments, with 4 factors and 5 levels for each factor were designed. These factors (or variables) were: initial concentration of Fe (II), initial concentration of H2O2, initial concentration of oxalate and the reaction time. A full-quadratic polynomial equation between the percentage of dye degradation (as a response) and the studied parameters was established. After removing the non-significant variables from the model, response surface method was used to obtain the optimum conditions. The optimum ranges of variables were: 0.25 - 0.35 mM for initial concentration of Fe (II), 5-17 mM for initial concentration of H2O2, 4-9 mM for initial concentration of oxalate, and 50-80 min for the reaction time. Also the results of extra experiments showed that these optimized values can be used for real samples and yield to a high value for the response

Petrochemical wastewater treatment by electro-Fenton process using aluminum and iron electrodes: Statistical comparison

“…These data are 1.23 and 3.65 in the EF-Fe. These results are in good agreement with the literature [11,14]. This may be due to that Fenton's reaction mechanisms would change and some side reactions would occur.…”

“…The response surface methodology (RSM) is an excellent tool for optimization and statistical analysis [14]. It allows considerable reduction of experiments number and a rapid interpretation [11,15].…”

Removal of organic compounds from wastewater originating from the production of printed circuit boards by UV-Fenton method

“…These parameters usually require optimization to achieve maximum effi ciency of Fenton's reaction for the given type of tested wastewater. Design of Experiments (DOE) and Response Surface Methodology (RSM), which are commonly used in chemistry, chemical technology and engineering environment are used for this purpose to optimize various kinds of processes (Zieliński 2007, Barbusiński and Fajkis 2011, Azami et al 2012, Maha and Tony 2014, Cao et al 2014. The aim of this study was to combine the previously used method of acidifi cation (precipitation of signifi cant amount of dissolved photopolymers due to their low solubility in an acidic medium), and UV-Fenton method (decomposition of the remaining photopolymers and the maximum reduction of COD wastewater) for treatment of wastewater from the photochemical treatment of printed circuit boards.…”

Utilization of a new optical sensor unit to monitor the electrochemical elimination of selected dyes in water

“…Textile and printing industries are regarded as the most polluting sectors, due to high discharge volume of dyes-contained wastewater. Dyes are highly soluble and persistent in polluted water, because they have long degradation time in the environment [1]. Pre-treatment has been found important for significant decrease of organic content and colour of dye polluted water.…”