title: Disinfection of wastewater effluents with the Fenton-like process induced by electromagnetic fields.
abstract: This research work is focused on the application and assessment of effectiveness of the Fenton-like processes induced by radiofrequency for the inactivation of faecal bacteria (Escherichia coli and Enterococcus sp.) present in treated urban wastewater effluents. Fenton processes were carried out at near neutral pH (pH 5) with different iron sources, such as iron salts (ferric chloride, 5, 50 and 100 mg/L Fe(3+)), magnetite (1 g/L) and clay (80 g/L), hydrogen peroxide (25 mg/L) and in absence and presence of radiofrequency. Two different electromagnetic field intensities (1.57 and 3.68 kA/m) were used in Fenton processes induced by radiofrequency. Different agents used in the Fenton processes induced by electromagnetic fields (iron source, hydrogen peroxide and RF) were analyzed individually and in combination under the same experimental conditions. First assays of ferromagnetic material/H2O2/radiofrequency processes achieved promising results in terms of bacterial inactivation. For instance, Fe(3+)/H2O2/Radiofrequency achieved a maximum level of E. coli inactivation of 3.55 log after 10 min of treatment. These results are higher than those obtained in absence of radiofrequency. The thermal activation of iron atoms allows the Fenton reaction to intensify, increasing the final yield of the treatment. On the other hand, different behavior was observed in the inactivation of E. coli and Enterococcus sp. due to the structural differences between Gram-negative and Gram-positive bacteria.
authors.affiliation: Department of Chemical Engineering and Environmental Technologies, University of Zaragoza, 3, María de Luna street, 50018 Zaragoza, Spain. Electronic address: rodriguezchueca@gmail.com.
authors.forename: J
authors.initials: J
authors.lastname: Rodríguez-Chueca
authors.affiliation: Department of Electrical and Electronic Engineering, University of Zaragoza, 1 María de Luna Street, 50018 Zaragoza, Spain. Electronic address: amediano@unizar.es.
authors.forename: A
authors.initials: A
authors.lastname: Mediano
authors.affiliation: Department of Chemical Engineering and Environmental Technologies, University of Zaragoza, 3, María de Luna street, 50018 Zaragoza, Spain. Electronic address: mpormad@unizar.es.
authors.forename: M P
authors.initials: MP
authors.lastname: Ormad
authors.affiliation: Department of Chemical Engineering and Environmental Technologies, University of Zaragoza, 3, María de Luna street, 50018 Zaragoza, Spain. Electronic address: mosteo@unizar.es.
authors.forename: R
authors.initials: R
authors.lastname: Mosteo
authors.affiliation: Department of Chemical Engineering and Environmental Technologies, University of Zaragoza, 3, María de Luna street, 50018 Zaragoza, Spain. Electronic address: oveleiro@unizar.es.
authors.forename: J L
authors.initials: JL
authors.lastname: Ovelleiro
mesh_terms: D004203:Disinfection / Q000379:methods*; D004305:Dose-Response Relationship, Drug; D004574:Electromagnetic Fields; D016983:Enterococcus / Q000187:drug effects / Q000528:radiation effects; D004926:Escherichia coli / Q000187:drug effects / Q000528:radiation effects; D006861:Hydrogen Peroxide / Q000528:radiation effects*; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000528:radiation effects*; D058085:Iron Compounds / Q000737:chemistry*; D062065:Wastewater / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D006861:Hydrogen Peroxide; D007501:Iron; D058085:Iron Compounds; D062065:Wastewater; C045076:Fenton's reagent
keywords: Electromagnetic field; Enterococcus sp.; Escherichia coli; Fenton; Radiofrequency; Wastewater