Comparison of UV-A photolytic and UV/TiO2 photocatalytic effects on Microcystis aeruginosa PCC7813 and four microcystin analogues : a pilot scale study
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Date
15/11/2021Author
Funder
Grant ID
EP/P029280/1
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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.
Citation
Menezes , I , Capelo-Neto , J , Pestana , C J , Clemente , A , Hui , J , Irvine , J T S , Nimal Gunaratne , H Q , Robertson , P K J , Edwards , C , Gillanders , R N , Turnbull , G A & Lawton , L A 2021 , ' Comparison of UV-A photolytic and UV/TiO 2 photocatalytic effects on Microcystis aeruginosa PCC7813 and four microcystin analogues : a pilot scale study ' , Journal of Environmental Management , vol. 298 , 113519 . https://doi.org/10.1016/j.jenvman.2021.113519
Publication
Journal of Environmental Management
Status
Peer reviewed
ISSN
0301-4797Type
Journal article
Description
The authors would like to thank the Engineering and Physical Sciences Research Council (EPSRC) [EP/P029280/1], the Coordination for the Improvement of Higher Education Personnel - CAPES [PROEX 20/2016 and PrInt 88887.311806/2018–00], and the Brazilian National Research Council – CNPq [403116/2016–3 and 304164/2017–8] for funding this research. As per EPSRC requirement all data will be made publicly available via the Robert Gordon University's open access repository OpenAIR@RGU. Further, the first author also acknowledges the scholarship from the Brazilian National Research Council - CNPq.Collections
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