engleski

Multiphysics modeling of environmental pollutants degradation by solar photocatalysis in semi-pilot reactors

Over the several last decades, solar photocatalysis has been proven as a viable option for removing of emerging and priority pollutants from the environment. To apply and intensify the process, appropriate photocatalytic reactor design is important, as well as modelling of the pollutant degradation. Lately, computational fluid dynamics modelling (CFD) gained on the importance due to its multiphysics approach, faster data processing and reducing number of the experiments. Therefore, in this work, multiphysics approach of modelling was applied for two photocatalytic reactors when removing of pollutants from waters are considered: a flat-plate cascade reactor (FPCR) and compound parabolic reactor (CPC). On a pilot scale, FPCR can be used as an innovative passive water protection at low cost in real outdoor systems since its mimics the natural recipient. Moreover, CPC reactor represents state-of-the-art in design due to photocatalysis intensification which makes it technically and economically most feasible for industrial and municipal application. A tool for assessing the degradation performance of the semi-pilot reactors was designed in the CFD software and compared with predictive model consisted of sub-models: radiation emission, fluid-dynamics and the reaction kinetics coupled with irradiation absorption and combined with the appropriate mass balance. For the comparation and validation of the CFD model experimental results of 1H-benzotriazole, imidaclopride and methylene blue degradation over titanium dioxide immobilized by modified sol-gel method on the glass fiber mesh were used.

photocatalytic reactor, 1H-benzotriazole, imidacloprid, methylene blue, computational fluid modelling.

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