Photocatalytic removal of the cyanobacterium Microcystis aeruginosa PCC7813 and four microcystins by TiO2 coated porous glass beads with UV-LED irradiation

Carlos J. Pestana*, Jolita Portela Noronha, Jianing Hui, Christine Edwards, H. Q. Nimal Gunaratne, John T S Irvine, Peter Robertson, José Capelo-Neto, Linda Lawton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Cyanobacteria and their toxic secondary metabolites are a challenge in water treatment due to increased biomass and dissolved metabolites in the raw water. Retrofitting existing water treatment infrastructure is prohibitively expensive or unfeasible, hence ‘in-reservoir’ treatment options are being explored. In the current study, a treatment system was able to photocatalytically inhibit the growth of Microcystis aeruginosa and remove released microcystins by photocatalysis using titanium dioxide coated, porous foamed glass beads and UV-LEDs (365 nm). A 35% reduction of M. aeruginosa PCC7813 cell density compared to control samples was achieved in seven days. As a function of cell removal, intracellular microcystins (microcystin-LR, -LY, -LW, and -LF) were removed by 49% from 0.69 to 0.35 μg mL−1 in seven days. Microcystins that leaked into the surrounding water from compromised cells were completely removed by photocatalysis. The findings of the current study demonstrate the feasibility of an in-reservoir treatment unit applying low cost UV-LEDs and porous foamed beads made from recycled glass coated with titanium dioxide as a means to control cyanobacteria and their toxins before they can reach the water treatment plant.
Original languageEnglish
Article number141154
Number of pages8
JournalScience of the Total Environment
Volume745
Early online date22 Jul 2020
DOIs
Publication statusPublished - 25 Nov 2020

Keywords

  • Cyanobacteria
  • Photocatalysis
  • Cyanotoxins
  • Water treatment
  • Titanium dioxide

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