Details

Autor(en) / Beteiligte

• García-Fernández, Irene
• Miralles-Cuevas, Sara
• Oller, Isabel
• Malato, Sixto
• Fernández-Ibáñez, Pilar
• Polo-López, María Inmaculada

Titel

Inactivation of E. coli and E. faecalis by solar photo-Fenton with EDDS complex at neutral pH in municipal wastewater effluents

Ist Teil von

• Journal of hazardous materials, 2019-06, Vol.372, p.85-93

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2019

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The benefit of adding EDDS on water disinfection by solar photo-Fenton was addressed.•Best Fe:EDDS reagent concentration in isotonic water was found to be 0.1:0.2 mM.•The presence of DOC reduced strongly the disinfection efficiency of Fe:EDDS:H2O2.•Higher bacterial inactivation rates were obtained for solar/H2O2 (0.3 mM) in MWWE. Photo-Fenton is a solar disinfection technology widely demonstrated to be effective to inactivate microorganisms in water by the combined effect of photoactivated iron species and the direct action of solar photons. Nevertheless, the precipitation of iron as ferric hydroxide at basic pH is the main disadvantage of this process. Thus, challenge in photo-Fenton is looking for alternatives to iron salts. Polycarboxylic acids, such as Ethylendiamine-N‘,N‘-disuccinic acid (EDDS), can form strong complex with Fe3+ and enhance the dissolution of iron in natural water through photochemical process. The aim of this study was to evaluate the disinfection effectiveness of solar photo-Fenton with and without EDDS in water. Several reagent concentrations were assessed, best bacterial (Escherichia coli and Enterococcus faecalis) inactivation was obtained with 0.1:0.2:0.3 mM (Fe3+:EDDS:H2O2) in isotonic water. The benefit of using EDDS complexes to increase the efficiency of kept dissolved iron in water at basic pH was proven. Solar disinfection and H2O2/solar with and without EDDS, and Fe3+:EDDS complexes were also investigated. Bacterial inactivation results in municipal wastewater effluents (MWWE) demonstrated that the competitive role of organic matter and inorganic compounds strongly affect the efficacy of Fe3+:EDDS at all concentrations tested, obtaining the fastest inactivation kinetics with H2O2/solar (0.3 mM).