Abstract
The use of ultraviolet light in photoreactors for wastewater treatment has become popular as an alternative of known chemical oxidative substances. UV LED light represents cheaper, robust, and versatile alternative to traditional UV lamps. In this study, it was designed and evaluated a photoreactor with an approach of chemical fluid dynamics (CFD) and experimental validation. The evaluation consisted of (1) CFD velocity profile analysis, (2) characterization of the average light distribution with potassium ferrioxalate actinometry, (3) degradation of a typical recalcitrant metallic cyanocomplex Fe(CN)63−, and (4) scavenger effect analysis in the photodegradation using potassium persulfate. Actinometrical essay concluded that the system was able to receive 1.93 μE/s. The reactor operated under turbulent regime and best result for Fe(CN)63− degradation was obtained at 4 h of operation, using 5-W UV-A LEDs, with pH ~ 7 and 10 mM de S2O82−. Baffled photoreactor demonstrated to be useful for this type of illumination and wastewater treatment.
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Acknowledgments
Acknowledgements are given to the Project “Recuperación de oro y tratamiento de aguas residuales de minería aurífera CI 2832” funded by Colciencias and Universidad del Valle and the Young Researcher Program 2015 of Colciencias Francisco Jose Caldas.
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Devia-Orjuela, J.S., Betancourt-Buitrago, L.A. & Machuca-Martinez, F. CFD modeling of a UV-A LED baffled flat-plate photoreactor for environment applications: a mining wastewater case. Environ Sci Pollut Res 26, 4510–4520 (2019). https://doi.org/10.1007/s11356-018-2431-2
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DOI: https://doi.org/10.1007/s11356-018-2431-2