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

Carlos J. Pestana*, 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, Christine Edwards, Sandra M.F.O. Azevedo, Peter K.J. Robertson, John T.S. Irvine, Linda A. Lawton

*Corresponding author for this work

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Abstract

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.
Original languageEnglish
Article number119299
Number of pages13
JournalWater Research
Volume226
Early online date31 Oct 2022
DOIs
Publication statusPublished - 1 Nov 2022

Keywords

  • Phytoplankton
  • Advanced oxidation processes
  • Water quality
  • Microbial community
  • 16S/18S rRNA sequencing
  • Mesocosm

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