Loughborough University
CEJ-D-17-07273R2-26012018.pdf (2.92 MB)

A novel prototype offset multi tubular photoreactor (OMTP) for solar photocatalytic degradation of water contaminants

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journal contribution
posted on 2018-06-22, 13:31 authored by Karen Sofia Ochoa-Gutierrez, Erick Tabares-Aguilar, Miguel Angel Mueses, Fiderman Machuca-Martinez, Gianluca Li-Puma
© 2018 Elsevier B.V. The design and operation of a new solar photoreactor prototype named Offset Multi Tubular Photoreactor (OMTP) is presented. The OMTP advances over the compound parabolic collector (CPC) photoreactor, which is one of the most efficient design for large-scale solar detoxification of water and wastewater. The OMTP design is based on a simple modification of the common CPC and included a supplementary set of tubes in the space occupied by the axes of intersection of the CPC reflective involutes. This new reactor configuration increased the irradiated reactor volume by 79% and the fluid residence time by up to 1.8-fold in comparison to the CPC, for the same solar irradiated area (footprint). The model parameters used for comparing and scaling the OMPT and CPC were β (reactor volume/total volume), α (area of absorption/total volume), α g (physical area/total volume), degradation efficiency η α per unit area, and the operating volume. The total solar energy absorbed in the reactors (1.74 m 2 footprint) was 15.17 W for the CPC and 21.86 W for the OMTP, which represents an overall gain of 44% for the latter. The performance of the OMTP and CPC were compared at the same value of solar exposure, β of 0.3 with optimal photocatalyst loading of 0.25 g/L titanium dioxide (TiO 2 P25). The degradation efficiencies of methylene blue, dichloroacetic acid, 4-chlorophenol (120 ppm initial concentration) in the OMTP were up to 81%, 125%, 118% and 242% higher, respectively, in comparison to the CPC after 8000 J/m 2 of accumulated solar energy. The OMTP should outperform the CPC in environmental and renewable energy applications of solar heterogeneous photocatalysis.


The authors thank the Universidad de Cartagena (Colombia), Universidad del Valle (Colombia), and Loughborough University (United Kingdom) for funding this publication. Mueses thanks the British Council for the Newton Fund Grant: Researcher Links-BC 030-EDU2016 for funding the stay in the United Kingdom for the development of this publication, COLCIENCIAS (Colombia) for funding doctoral studies, and the Office of the Vice-Head for Research of the University of Cartagena through the Group Strengthening Project 060-2015 for funding this research.



  • Aeronautical, Automotive, Chemical and Materials Engineering


  • Chemical Engineering

Published in

Chemical Engineering Journal




628 - 638


OCHOA-GUTIERREZ, K.S. ...et al., 2018. A novel prototype offset multi tubular photoreactor (OMTP) for solar photocatalytic degradation of water contaminants. Chemical Engineering Journal, 341, pp. 628-638.


© Elsevier


  • AM (Accepted Manuscript)

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This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

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This paper was accepted for publication in the journal Chemical Engineering Journal and the definitive published version is available at https://doi.org/10.1016/j.cej.2018.02.068




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