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Comparison of UV-A photolytic and UV/TiO2 photocatalytic effects on Microcystis aeruginosa PCC7813 and four microcystin analogues: a pilot scale study

Research output: Contribution to journalArticlepeer-review

Open Access Status

  • Embargoed (until 16/08/22)

Author(s)

Indira Menezes, José Capelo-Neto, Carlos J. Pestana, Allan Clemente, Jianing Hui, John T.S. Irvine, H.Q. Nimal Gunaratne, Peter K.J. Robertson, Christine Edwards, Ross N. Gillanders, Graham A. Turnbull, Linda A. Lawton

School/Research organisations

Abstract

To date, the high cost of supplying UV irradiation has prevented the widespread application of UV photolysis and titanium dioxide based photocatalysis in removing undesirable organics in the water treatment sector. To overcome this problem, the use of UV-LEDs (365 nm) for photolysis and heterogeneous photocatalysis applying TiO2 coated glass beads under UV-LED illumination (365 nm) in a pilot scale reactor for the elimination of Microcystis aeruginosa PCC7813 and four microcystin analogues (MC-LR, -LY, -LW, -LF) with a view to deployment in drinking water reservoirs was investigated. UV-A (365 nm) photolysis was shown to be more effective than the UV/TiO2 photocatalytic system for the removal of Microcystis aeruginosa cells and microcystins. During photolysis, cell density significantly decreased over 5 days from an initial concentration of 5.8 × 106 cells mL−1 until few cells were left. Both intra- and extracellular microcystin concentrations were significantly reduced by 100 and 92 %, respectively, by day 5 of the UV treatment for all microcystin analogues. During UV/TiO2 treatment, there was great variability between replicates, making prediction of the effect on cyanobacterial cell and toxin behavior difficult.
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Details

Original languageEnglish
Article number113519
JournalJournal of Environmental Management
Volume298
Early online date16 Aug 2021
DOIs
Publication statusE-pub ahead of print - 16 Aug 2021

    Research areas

  • Blue-green algae, Cyanotoxins, Water treatment, Titanium dioxide, Cyanobacteria

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