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

Research output: Contribution to journalArticlepeer-review

Author(s)

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

School/Research organisations

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.
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Details

Original languageEnglish
Article number141154
JournalScience of the Total Environment
Volume745
Early online date22 Jul 2020
DOIs
Publication statusPublished - 25 Nov 2020

    Research areas

  • Cyanobacteria, Cyanotoxins, Photocatalysis, Titanium dioxide, UV-LED, Water treatment

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