Photocatalysis batch reactors

Both batch reactors and continuous-flow reactors have been used. Because Ti02 photocatalysis is generally considered of interest in purifying air or water with low concentrations of pollutants, the absorption of the incident photons by the pollutants is most often insignificant. If it is not the case, a falling film annular reactor (49) can be used as in photochemistry. 

Sopajaree, K., Qasim, S. A., Basak, S., and Rajeshwar, K., 1999a, Integrated flow-reactor membrane filtration system for heterogeneous photocatalysis. Part I. Experiments and modeling of a batch - recirculated photoreactor, J. App. Electrochem., 29(5) 533-539. 

Sopajaree K, Qasim S A, Basak S and Rajeshwar K (1999a), An integrated flow reactor-membrane filtration system for heterogeneous photocatalysis. Part I Experiments and modelling of a batch-recirculated photoreactor , / Appl Electrochem, 29,533-539. 

Pressurized PMRs are systems in which photocatalysis is coupled with MF, UF or NF. These reactors can be operated either in batch or continuous... 

In Fig. 21.7 a laboratory scale PMR coupling photocatalysis with MF is shown. The PMR was applied for the removal of trichloroethylene (TCE) from water (Choo et al., 2008). The system was composed of a photocatalytic reactor (volume of 700 cm ) and a hollow fiber MF module (effective membrane surface area of 20.7 cm ). A UV-A light source was placed in the inner chamber of the photoreactor, whereas in the outer chamber the solution undergoing the photocatalytic reaction was flowing. Feed from the feed tank was pumped through the photoreactor to the membrane module. The PMR was operated either in batch or in continuous mode. In batch operations, the permeate and retentate were recycled to the photoreactor. In continuous mode, the permeate was discharged and the same volume of the solution was fed into the reactor. Thus the working volume of the photoreactor was maintained at a constant level. 

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