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Electrochemical advanced oxidation processes for Staphylococcus aureus disinfection in municipal WWTP effluents
This paper presents the Staphylococcus aureus inactivation in a simulated wastewater treatment plant effluent by different electrochemical techniques, including the photo-electro-Fenton process. S. aureus, dissolved organic carbon (DOC), total oxidants and H.sub.2O.sub.2 concentrations, as well as pH, were monitored during the assays. An electrolytic cell, including a UVA lamp, a gas diffusion electrode (GDE) as cathode and an IrO.sub.2 anode, was used to conduct the experiments under galvanostatic conditions (20 mA). Low inactivation (-0.4) and low DOC removal were achieved within 120 min when applying the GDE-IrO.sub.2 system, in which bacteria disinfection was caused by the generated H.sub.2O.sub.2. When light was combined with GDE-IrO.sub.2, the process efficiency noticeably increased (-3.7 log inactivation) due to the synergistic effect between UVA and H.sub.2O.sub.2. Introducing iron (5 mg L.sup.-1 Fe.sup.2+) into the system also produced higher disinfection and DOC mineralization. The electro-Fenton process (GDE-IrO.sub.2+Fe.sup.2+) led to a bacterial reduction of -0.9 log units and DOC reduction of 14%, while with the photo-electro-Fenton process (GDE-IrO.sub.2+UVA + Fe.sup.2+) -5.2 units of bacteria and 26% of DOC were removed. Increasing the current intensity (20 mA, 30 mA and 40 mA) in the photo-electro-Fenton system increased H.sub.2O.sub.2 production and, consequently, augmented the bacterial inactivation (-5.2 log, -6.2 log and -6.5 log, respectively). However, mineralization extent slightly increased or remained practically the same. When comparing the influence of Fe.sup.2+ and Fe.sup.3+ on photo-electro-Fenton, similar S. aureus inactivation was observed, while DOC removal was higher with Fe.sup.2+ (31%) than with Fe.sup.3+ (19%). Finally, by testing the system with a Ti anode, the direct anodic oxidation contribution of the IrO.sub.2 anode was identified as negligible.
Electrochemical advanced oxidation processes for Staphylococcus aureus disinfection in municipal WWTP effluents
This paper presents the Staphylococcus aureus inactivation in a simulated wastewater treatment plant effluent by different electrochemical techniques, including the photo-electro-Fenton process. S. aureus, dissolved organic carbon (DOC), total oxidants and H.sub.2O.sub.2 concentrations, as well as pH, were monitored during the assays. An electrolytic cell, including a UVA lamp, a gas diffusion electrode (GDE) as cathode and an IrO.sub.2 anode, was used to conduct the experiments under galvanostatic conditions (20 mA). Low inactivation (-0.4) and low DOC removal were achieved within 120 min when applying the GDE-IrO.sub.2 system, in which bacteria disinfection was caused by the generated H.sub.2O.sub.2. When light was combined with GDE-IrO.sub.2, the process efficiency noticeably increased (-3.7 log inactivation) due to the synergistic effect between UVA and H.sub.2O.sub.2. Introducing iron (5 mg L.sup.-1 Fe.sup.2+) into the system also produced higher disinfection and DOC mineralization. The electro-Fenton process (GDE-IrO.sub.2+Fe.sup.2+) led to a bacterial reduction of -0.9 log units and DOC reduction of 14%, while with the photo-electro-Fenton process (GDE-IrO.sub.2+UVA + Fe.sup.2+) -5.2 units of bacteria and 26% of DOC were removed. Increasing the current intensity (20 mA, 30 mA and 40 mA) in the photo-electro-Fenton system increased H.sub.2O.sub.2 production and, consequently, augmented the bacterial inactivation (-5.2 log, -6.2 log and -6.5 log, respectively). However, mineralization extent slightly increased or remained practically the same. When comparing the influence of Fe.sup.2+ and Fe.sup.3+ on photo-electro-Fenton, similar S. aureus inactivation was observed, while DOC removal was higher with Fe.sup.2+ (31%) than with Fe.sup.3+ (19%). Finally, by testing the system with a Ti anode, the direct anodic oxidation contribution of the IrO.sub.2 anode was identified as negligible.
Electrochemical advanced oxidation processes for Staphylococcus aureus disinfection in municipal WWTP effluents
Valero, Pilar (author) / Verbel, Martha / Silva-Agredo, Javier / Mosteo, Rosa / Ormad, Maria P / Torres-Palma, Ricardo A
2017
Article (Journal)
English
BKL:
43.00
| American Institute of Physics | 2013