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    Desenvolvimento de reator fotoquímico para tratamento de efluentes e avaliação fluidodinâmica através da distribuição do tempo de residência
    (Universidade Federal de São Paulo (UNIFESP), 2020-09-25) Braga, Vanessa De Macedo [UNIFESP]; Ribeiro, Katia [UNIFESP]; Universidade Federal de São Paulo
    Advanced oxidative process (AOP) has been extensively studied to treat wastewater containing persistent organic pollutants. The mixture provided by the photochemical reactor has influence on the process mass transfer rate and photon absorption. Thus, photochemical reactors improvement contributes to AOP good performance. This work aimed the fluid dynamics assessment of a tubular photochemical reactor, developed for effluent treatment using AOP, through the experimental and simulated residence time distribution (RTD). The photoreactor has axial fluid inlet and outlet in flanges with 18 internal orifices through which fluid is distributed within the reactor. RTD was experimentally determined by tracer method. Experimental data were used to validate with good agreement (R=0.9841) the distribution curve obtained by simulation in computational fluid dynamics (CFD) applying the k-ε model. The flow pattern was evaluated applying axial dispersion, tanks-in-series and pure convection models. RTD showed 72% of the reactor useful volume is active and 28% are stagnation zones mainly caused by predominantly laminar flow. Axial dispersion model best fitted the equipment RTD. The flow presented high dispersion (Pe = 2.41 and n = 3.81) and significant deviation of the plug flow. The inlet flange has an orifice plate behavior that induced fluid recirculation at the inlet, but the flow is mainly laminar. The introduction of distribution plates inside the reactor increased tracer recirculation. Although they showed no significant influence on turbulence, they can provide a constant fluid changing closer to the lamp.