Optimization of Fenton Technology for Recalcitrant Compounds and Bacteria Inactivation

Abstract

In this work, the Fenton technology was applied to decolorize methylene blue (MB) and to inactivate Escherichia coli K12, used as recalcitrant compound and bacteria models respectively, in order to provide an approach into single and combinative effects of the main process variables influencing the Fenton technology. First, Box–Behnken design (BBD) was applied to evaluate and optimize the individual and interactive effects of three process parameters, namely Fe2+ concentration (6.0 × 10−4, 8.0 × 10−4 and 1.0 × 10−3 mol/L), molar ratio between H2O2 and Fe2+ (1:1, 2:1 and 3:1) and pH (3.0, 4.0 and 5.0) for Fenton technology. The responses studied in these models were the degree of MB decolorization (D%MB), rate constant of MB decolorization (kappMB) and E. coli K12 inactivation in uLog units (IuLogEC). According to the results of analysis of variances all of the proposed models were adequate with a high regression coefficient (R2 from 0.9911 to 0.9994). BBD results suggest that [H2O2]/[Fe2+] values had a significant effect only on D%MB response, [Fe2+] had a significant effect on all the responses, whereas pH had a significant effect on D%MB and IuLogEC. The optimum conditions obtained from response surface methodology for D%MB ([H2O2]/[Fe2+] = 2.9, [Fe2+] = 1.0 × 10−3 mol/L and pH = 3.2), kappMB ([H2O2]/[Fe2+] = 1.7, [Fe2+] = 1.0 × 10−3 mol/L and PH = 3.7) and IuLogEC ([H2O2]/[Fe2+] = 2.9, [Fe2+] = 7.6 × 10−4 mol/L and pH= 3.2) were in good agreement with the values predicted by the model.

Recent Advances in Photocatalytic Removal of Microplastics: Mechanisms, Kinetic Degradation, and Reactor Design

“…Fenton's reagent removes or degrades a wide variety of contaminants in an aqueous solution either alone or in combination with other processes. Fenton process was successfully used in textile (Arslan-Alaton et al, 2007;Liu et al, 2007;Nadeem et al, 2020), pharmaceutical (Martıńez et al, 2003;Molina et al, 2020), dyeing (Gulkaya et al, 2006;Wang, 2008;Salgado et al, 2020), olive oil mills (Rivas et al, 2001;Beltrań-Heredia et al, 2001;RuÃz-Delgado et al, 2020), oil (Sivagami et al, 2019;Gamaralalage et al, 2019), and cosmetics industries (Bautista et al, 2007;De Andrade et al, 2020), as well as in the reduction of polynuclear aromatic hydrocarbons (Beltrań et al, 1998;Singa et al, 2021), the treatment of brines (Rivas et al, 2003), the degradation of phenol and bisphenols (Carriazo et al, 2005;Zulfiqar et al, 2021), the treatment of effluent from herbicides and pesticides production industry (Sangami and Manu, 2017;Zhao and Zhang, 2021), the treatment of landfill leachates (Tejera et al, 2021;Filho et al, 2021), the degradation of recalcitrant oil spill components anthracene and pyrene (Sekar and DiChristina, 2017;RuÃz-Delgado et al, 2020), the inactivation of Escherichia coli K12 (Rivas et al, 2001), the treatment of recalcitrant industrial wastewater (Cai et al, 2021), and the treatment of high-molecular-weight melanoidin molecules (Raji et al, 2021). More details about Fenton technology for the treatment of recalcitrant organic molecules in several industries can be checked out in our recently published book chapter (Hamd and Dutta, 2020).…”