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Suppressing cyanobacterial dominance by UV-LED TiO2-photocatalysis in a drinking water reservoir: a mesocosm study.

Pestana, Carlos J.; Santos, Allan A.; Capelo-Neto, José; Melo, Vânia M.M.; Reis, Kelly C.; Oliveira, Samylla; Rogers, Ricardo; Pacheco, Ana B.F.; Hui, Jianing; Skillen, Nathan C.; Barros, Mário U.G.; Edwards, Christine; Azevedo, Sandra M.F.O.; Robertson, Peter K.J.; Irvine, John T.S.; Lawton, Linda A.


Allan A. Santos

José Capelo-Neto

Vânia M.M. Melo

Kelly C. Reis

Samylla Oliveira

Ricardo Rogers

Ana B.F. Pacheco

Jianing Hui

Nathan C. Skillen

Mário U.G. Barros

Sandra M.F.O. Azevedo

Peter K.J. Robertson

John T.S. Irvine


Cyanobacteria and their toxic secondary metabolites present challenges for water treatment globally. In this study we have assessed TiO2 immobilized onto recycled foamed glass beads by a facile calcination method, combined in treatment units with 365 nm UV-LEDs. The treatment system was deployed in mesocosms within a eutrophic Brazilian drinking water reservoir. The treatment units were deployed for 7 days and suppressed cyanobacterial abundance by 85%, while at the same time enhancing other water quality parameters; turbidity and transparency improved by 40 and 81% respectively. Genomic analysis of the microbiota in the treated mesocosms revealed that the composition of the cyanobacterial community was affected and the abundance of Bacteroidetes and Proteobacteria increased during cyanobacterial suppression. The effect of the treatment on zooplankton and other eukaryotes was also monitored. The abundance of zooplankton decreased while Chrysophyte and Alveolata loadings increased. The results of this proof-of-concept study demonstrate the potential for full-scale, in-reservoir application of advanced oxidation processes as complementary water treatment processes.


PESTANA, C.J., SANTOS, A.A., CAPELO-NETO, J. et al. 2022. Suppressing cyanobacterial dominance by UV-LED TiO2-photocatalysis in a drinking water reservoir: a mesocosm study. Water research [online], 226, article 119299. Available from:

Journal Article Type Article
Acceptance Date Oct 23, 2022
Online Publication Date Oct 31, 2022
Publication Date Nov 1, 2022
Deposit Date Oct 26, 2022
Publicly Available Date Oct 26, 2022
Journal Water Research
Print ISSN 0043-1354
Electronic ISSN 1879-2448
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 226
Article Number 119299
Keywords Phytoplankton; Advanced oxidation processes; Water quality; Microbial communities; Brazil
Public URL


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