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Study of marine bacteria inactivation by photochemical processes: disinfection kinetics and growth modeling after treatment


The importance of seawater treatment in order to avoid microbiological pollution related to aquaculture or ballast water management has increased during the last few years. Bacterial indicators used for the evaluation of different disinfection treatments are usually related with both waste and drinking water, these standards are not usual microorganisms found in seawater. Thus, it is thought necessary to study the behavior of different marine-specific organisms in regard to improve the disinfection processes in seawater. In this study, three different bacteria have been selected among major groups of bacterial community from marine waters: two water-associated, Roseobacter sp. and Pseudomonas litoralis, and one sediment-associated, Kocuria rhizophila. A kinetic inactivation model together with a post-treatment growth tendency has been obtained after the application of UV-C and UV/H2O2 processes. According to the first kinetic rate constant, different responses were obtained for the different bacterial groups. Once the treatment was applied, modeling of growth curves revealed high recover within the first 3 days after treatment, even when UV/H2O2 was applied. This study introduces a sensitivity index, in which results show different levels of resistance for both treatments, being Roseobacter sp. the most sensitive bacteria, followed by P. litoralis and K. rhizophila.

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This research was developed under the R + D Project AVANTE (CTM2014-52116-R) funded by the Spanish Ministry of Economy and Competitiveness.

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Correspondence to Javier Moreno-Andrés.

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Responsible editor: Vítor Pais Vilar

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Moreno-Andrés, J., Acevedo-Merino, A. & Nebot, E. Study of marine bacteria inactivation by photochemical processes: disinfection kinetics and growth modeling after treatment. Environ Sci Pollut Res 25, 27693–27703 (2018).

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  • Marine bacteria
  • Ballast water
  • Proteobacteria
  • Actinobacteria
  • UV inactivation
  • Advanced oxidation processes
  • Regrowth