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Sci Total Environ. 2020 Apr 1;711:134611. doi: 10.1016/j.scitotenv.2019.134611. Epub 2019 Nov 21.

Effect of the length of dark storage following ultraviolet irradiation of Tetraselmis suecica and its implications for ballast water management.

Author information

1
Department of Environmental Technologies, INMAR-Marine Research Institute, University of Cádiz, Campus Universitario Puerto Real, 11510 Puerto Real, Cádiz, Spain. Electronic address: leonardo.romero@uca.es.
2
Department of Environmental Technologies, INMAR-Marine Research Institute, University of Cádiz, Campus Universitario Puerto Real, 11510 Puerto Real, Cádiz, Spain.
3
Institute of Marine Sciences of Andalucía (CSIC), Campus Río San Pedro, s/n 11510, Puerto Real, Cádiz, Spain.

Abstract

Meeting the recent biological standards established by the Ballast Water Management Convention requires the application of ballast water treatment systems; ultraviolet irradiation is a frequently used option. However, organisms can repair the damage caused by ultraviolet irradiation primarily with photo-repair mechanisms that are dependent on the availability of light. The objective of this study is to quantify the impact of dark storage following ultraviolet irradiation on the viability of the microalgae Tetraselmis suecica. Results showed that one day of dark storage after ultraviolet irradiation enhanced the inactivation rate by 50% with respect to the absence of dark storage and increased up to the 84% with five days of dark storage. These results are consistent with photorepair, mostly in the first two days, prevented in the dark. The dose required to inactivate a determined ratio of organisms was correlated with the length of the dark post-treatment according to an inverse proportional function. This correlation may help to optimize the operation of ultraviolet ballast water treatment systems. Further, the results show that growth assays can detect organisms that are capable of repair after treatment with UV.

KEYWORDS:

Ballast water; Photoreactivation; Tetraselmis suecica; Ultraviolet disinfection; Viability

PMID:
31810674
DOI:
10.1016/j.scitotenv.2019.134611
[Indexed for MEDLINE]

Conflict of interest statement

Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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