Dr Carlos Pestana c.pestana@rgu.ac.uk
Lecturer
A paradigm-shift in water treatment: in-reservoir UV-LED-driven TiO2 photocatalysis for the removal of cyanobacteria: a mesocosm study.
Pestana, Carlos J.; Capel-Neto, Jose; Hui, Jianing; Robertson, Peter K.J.; Oliveira, Samylla; Rogers, Ricardo; Santos, Allan; Azevedo, Sandra M.F.O.; Edwards, Christine; Irvine, John T.S.; Lawton, Linda
Authors
Jose Capel-Neto
Jianing Hui
Peter K.J. Robertson
Samylla Oliveira
Ricardo Rogers
Allan Santos
Sandra M.F.O. Azevedo
Professor Christine Edwards c.edwards@rgu.ac.uk
Professor
John T.S. Irvine
Professor Linda Lawton l.lawton@rgu.ac.uk
Professor
Abstract
Potentially harmful cyanobacteria challenge potable water treatment globally, with high biomass events, and dissolved toxic and nuisance metabolites. Retrofitting existing water treatment infrastructure is often impractical (if not impossible) and often prohibitively expensive. In a paradigm-shifting move, we propose in-reservoir pre-treatment of cyanobacteria-contaminated raw waters to ease the burden on existing water treatment infrastructure. In an iterative design approach over three years, treatment modules have been designed, refined and optimised, in bench and pilot-scale studies for in-reservoir deployment. TiO2-coated beads made from recycled glass are employed in conjunction with UV-light emitting diodes (LEDs), to create highly reactive hydroxyl radicals that preferably remove cyanobacteria and subsequently released cyanotoxins from raw water. In a mesocosm study using a drinking water reservoir in Brazil, water quality parameters were markedly improved within 72h of deployment and cyanobacterial presence was decreased by over 90% without affecting other phytoplankton communities. The treatment system is virtually plastic-free, low cost, utilises recycled materials and could ultimately be powered by renewable energies, thus providing a true green treatment option. We have conclusively demonstrated that a paradigm-shift towards in-reservoir treatment is not only possible but feasible and can provide a valuable addition to conventional water treatment methods.
Citation
PESTANA, C.J., CAPELO-NETO, J., HUI, J., ROBERTSON, P.K.J., OLIVEIRA, S., ROGERS, R., SANTOS, A., AZEVEDO, S.M.F.O., EDWARDS, C., IRVINE, J.T.S. and LAWTON, L.A. 2022. A paradigm-shift in water treatment: in-reservoir UV-LED-driven TiO2 photocatalysis for the removal of cyanobacteria: a mesocosm study. Presented at the 12th International conference on toxic cyanobacteria (ICTC 2022), 22-27 May 2022, Toledo, USA.
Presentation Conference Type | Lecture |
---|---|
Conference Name | 12th International conference on toxic cyanobacteria (ICTC 2022) |
Conference Location | Toledo, USA |
Start Date | May 22, 2022 |
End Date | May 27, 2022 |
Deposit Date | Oct 5, 2022 |
Publicly Available Date | Jan 23, 2023 |
Keywords | Cyanobacteria; Water treatment; Photocatalysis; Titanium dioxide |
Public URL | https://rgu-repository.worktribe.com/output/1769140 |
Files
PESTANA 2022 A paradigm-shift in water (SLIDES)
(3.4 Mb)
PDF
You might also like
Downloadable Citations
About OpenAIR@RGU
Administrator e-mail: publications@rgu.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search