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Catalysts 2016, 6(9), 138; doi:10.3390/catal6090138

TiO2 Solar Photocatalytic Reactor Systems: Selection of Reactor Design for Scale-up and Commercialization—Analytical Review

1
Environmental Engineering, American University in Cairo, Cairo 11835, Egypt
2
Department of Construction Engineering, American University in Cairo, Cairo 11835, Egypt
3
Department of Chemistry, American University in Cairo, Cairo 11835, Egypt
*
Author to whom correspondence should be addressed.
Academic Editor: Bunsho Ohtani
Received: 25 July 2016 / Revised: 31 August 2016 / Accepted: 1 September 2016 / Published: 10 September 2016
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Abstract

For the last four decades, viability of photocatalytic degradation of organic compounds in water streams has been demonstrated. Different configurations for solar TiO2 photocatalytic reactors have been used, however pilot and demonstration plants are still countable. Degradation efficiency reported as a function of treatment time does not answer the question: which of these reactor configurations is the most suitable for photocatalytic process and optimum for scale-up and commercialization? Degradation efficiency expressed as a function of the reactor throughput and ease of catalyst removal from treated effluent are used for comparing performance of different reactor configurations to select the optimum for scale-up. Comparison included parabolic trough, flat plate, double skin sheet, shallow ponds, shallow tanks, thin-film fixed-bed, thin film cascade, step, compound parabolic concentrators, fountain, slurry bubble column, pebble bed and packed bed reactors. Degradation efficiency as a function of system throughput is a powerful indicator for comparing the performance of photocatalytic reactors of different types and geometries, at different development scales. Shallow ponds, shallow tanks and fountain reactors have the potential of meeting all the process requirements and a relatively high throughput are suitable for developing into continuous industrial-scale treatment units given that an efficient immobilized or supported photocatalyst is used. View Full-Text
Keywords: titanium dioxide; heterogeneous photocatalysis; wastewater treatment; solar photocatalytic reactors; scale-up and commercialization titanium dioxide; heterogeneous photocatalysis; wastewater treatment; solar photocatalytic reactors; scale-up and commercialization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Abdel-Maksoud, Y.; Imam, E.; Ramadan, A. TiO2 Solar Photocatalytic Reactor Systems: Selection of Reactor Design for Scale-up and Commercialization—Analytical Review. Catalysts 2016, 6, 138.

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