Abstract
In this study, the simultaneous degradation of antibiotics (ampicillin, sulfamethazine, and tetracycline; and non-steroidal anti-inflammatories (diclofenac and salicylic acid)) including the total organic carbon abatement by solar photoelectro-Fenton process was assessed. Eight liters of solution containing the mixture of the five pharmaceuticals in 1 mmol L−1 Fe2+, 0.05 mol L−1 Na2SO4 at pH 3 and 35 °C were electrolyzed applying different current densities (j = 10, 25, and 50 mA cm−2) in a solar-electrochemical pilot plant. The pilot plant was equipped with an electrochemical filter press cell with a dimensionally stable anode (DSA type) and an air-diffusion cathode coupled to a solar photoreactor exposed directly to sunlight radiation. All pharmaceuticals were degraded during the first 10 min. A TOC removal efficiency of 99.2% after 100 min of treatment with an energy consumption of 534.23 kW h (kgTOC)−1 and 7.15 kW h m−3 was achieved. The pharmaceutical concentration decay followed a pseudo-first-order kinetics. The specific energy per unit of mass of ampicillin, diclofenac, salicylic acid, sulfamethazine, and tetracycline was obtained at 11.73, 19.56, 35.2, 11.73, and 39.32 kW h (kgPD)−1 for ampicillin, diclofenac, salicylic acid, sulfamethazine, and tetracycline, respectively. With our results, we demonstrated that SPEF is an emerging technology for the treatment of this type of pollutants in short time.
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Funding
Miguel A. Sandoval is grateful to Consejo Nacional de Ciencia y Tecnología, México (CONACYT), for granting the postdoctoral scholarship, No. 386022, and Dirección de Investigaciones Científicas y Tecnológicas (DICYT), Universidad de Santiago de Chile, under the project 021942SG_POSDOC. Ricardo Salazar thanks ECOS-CONICYT 170019 and ANID/FONDAP/15110019.
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Sebastián Bugueño-Carrasco: conceptualization, investigation, methodology; Hélène Monteil: conceptualization, investigation, methodology; Carla Toledo-Neira: conceptualization, formal analysis, resources, supervision, validation; Miguel Ángel Sandoval: conceptualization, formal analysis, visualization, writing–original draft, and writing–review and editing; Abdoulaye Thiam: conceptualization, formal analysis, visualization, and writing–review and editing; Ricardo Salazar: conceptualization, data curation, formal analysis, funding acquisition, resources, supervision, validation, visualization, and writing–review and editing.
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Bugueño-Carrasco, S., Monteil, H., Toledo-Neira, C. et al. Elimination of pharmaceutical pollutants by solar photoelectro-Fenton process in a pilot plant. Environ Sci Pollut Res 28, 23753–23766 (2021). https://doi.org/10.1007/s11356-020-11223-y
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DOI: https://doi.org/10.1007/s11356-020-11223-y