Recolonization by heterotrophic bacteria after UV irradiation or ozonation of seawater; a simulation of ballast water treatment

Water Research
Ole-Kristian Hess-ErgaO Vadstein

Abstract

Transport of ballast water with ships represents a risk for introduction of foreign species. If ballast water is treated during uptake, there will be a recolonization of the ballast water by heterotrophic bacteria during transport. We investigated survival and succession of heterotrophic bacteria after disinfection of seawater in the laboratory, representing a model system of ballast water treatment and transport. The seawater was exposed to ultraviolet (UV) irradiation, ozone (2 doses) or no treatment, incubated for 16 days and examined with culture-dependent and -independent methods. The number of colony-forming units (CFU) was reduced below the detection level after disinfection with UV and high ozone dose (700 mV), and 1% of the initial level for the low ozone dose (400 mV). After less than 3 days, the CFU was back or above the starting point for the control, UV and low ozone treatment, whereas it took slightly more than 6 days for the high ozone treatment. Disinfection increased substrate availability and reduced cell densities. Lack of competition and predation induced the recolonization by opportunistic bacteria (r-strategists), with significant increase in bacterial numbers and a low diversity (based on DGGE band patter...Continue Reading

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Citations

Feb 18, 2016·Marine Pollution Bulletin·Shuiping ChenSteve Sandoe
Nov 7, 2012·Marine Environmental Research·Aina Charlotte WennbergHelge Liltved
Jan 19, 2015·Marine Pollution Bulletin·Andrew N Cohen, Fred C Dobbs
Jan 10, 2012·Marine Pollution Bulletin·Else M FykseJanet M Blatny
Dec 4, 2012·Marine Pollution Bulletin·Lucía F MartínezJulio L Bueno
Aug 31, 2013·Marine Pollution Bulletin·Lucie MarandaDavid C Smith
May 18, 2016·Marine Pollution Bulletin·Carolina Grob, Bruno G Pollet
Jan 8, 2018·Environmental Science and Pollution Research International·Javier Moreno-AndrésEnrique Nebot
Sep 14, 2018·Frontiers in Microbiology·Olav VadsteinPeter Bossier
Jan 27, 2019·The Science of the Total Environment·Ole-Kristian Hess-ErgaOlav Vadstein

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