UV fluences required for compliance with ballast water discharge standards using two approved methods for algal viability assessment

Kim Lundgreen, Henrik Holbech, Knud Ladegaard Pedersen, Gitte Ingelise Petersen, Rune Røjgaard Andreasen, Guillaume Drillet, Christaline George, Martin Andersen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

This study investigates the extra UV fluence needed to meet the International Maritime Organisation's ballast water discharge standards for the 10–50 μm size-class using the approved vital stain (VS) method compared to the Most Probable Number (MPN) method for organism viability assessment. Low- and medium pressure UV collimated beam treatments were applied to natural algae collected in temperate and tropical water environments and analysed using both methods. About 10 times higher UV fluence was required to meet discharge standards when using VS compared to MPN. Implementing a dark-hold period after UV treatments decreased algal viability. Length of dark-hold period to meet discharge standards decreased with increasing UV fluence. No significant differences between temperate and tropical samples were observed. The results showed that UV treated algae assessed using the VS method could meet discharge standards by increasing fluence and/or introducing a dark-hold period.
OriginalsprogEngelsk
TidsskriftMarine Pollution Bulletin
Vol/bind135
Sider (fra-til)1090-1100
ISSN0025-326X
DOI
StatusUdgivet - 28. aug. 2018

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