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 3− ferrioxalate actinometry, (3) degradation of a typical recalcitrant metallic cyanocomplex Fe(CN) , and (4) scavenger effect analysis in the photodegradation using potassium persulfate. Actinometrical essay concluded that the system was able to receive 3− 1.93 μE/s. The reactor operated under turbulent regime and best result for Fe(CN) degradation was obtained at 4 h of 2− operation, using 5-W UV-A LEDs, with pH ~ 7 and 10 mM de S O . Baffled photoreactor demonstrated to be useful for this 2 8 type of illumination and wastewater treatment. . . . . . Keywords Photoreactor UV LED Cyanocomplex CFD Actinometry Photodegradation Introduction several processes have been well described to remove cyanometallic compounds in wastewater. The most known pro- Gold extraction represents an important part of all
Environmental Science and Pollution Research – Springer Journals
Published: Jun 2, 2018
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