Evaluation of methods to treat ballast water - Annual report 2009

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Project director:                                                                    Vadstein, Olav, Dept. Biotechnology, NTNU

Post-doc/ scholar:                                                                  Hess-Erga, Ole-Kristian

Project duration:                                                                   01.08.05 – 2.09.09

Technical contact person in Statoil:                                

Division head:                                                                      Mostad, Helle Brit

Project number:                                                                    6147

Object

It is well documented that ballast water has been the cause of unwanted introduction of marine organisms. When the organisms are discharged into new environments, they may become invasive and severely disrupt native ecology, impact economic activities such as fisheries and cause disease and even death in humans. With this as background, the International Maritime Organisation (IMO) adopted a ballast water convention in February 2004 and by doing so initiated further development of ballast water treatment technology. Our project focus on these matters and the main object will be to evaluate two methods to treat ballast water and how to monitor the efficiency. The one sure measurement of treatment success will be the discrimination between live and dead organisms and this will be one of the projects greatest challenges. An array of test assays with different approaches will be needed to explore this problem. In addition, we will investigate regrowth of heterotrophic bacteria, substrate modification and generation.

Status:

The thesis; Disinfection of seawater and implications for ballast water treatment was delivered the 15^th of January. The thesis contains 1 published article and 3 manuscripts (below).

This project is focusing on four areas of disinfection: Particle protection of marine bacteria, recolonization, substrate modification/generation and consequences for ballast water management.

One article is published (Biotic and abiotic particles protect marine heterotrophic bacteria during UV and ozone disinfection). One manuscript is resubmitted for review (Recolonization by heterotrophic bacteria after UV irradiation or ozonation of seawater; a simulation of ballast water treatment). Based on results from the Recolonization manuscript, substrate generation and modification was investigated in a new set of experiments. This manuscript (Characterization of dissolved organic matter after UV irradiation of seawater) will soon be submitted to a suitable journal. A review manuscript (Microbial ecology of ballast water: disinfection, dynamics and implications) will also soon be submitted.

Publications:

Hess-Erga, O-K., Attramadal, K.J.K., Vadstein, O. 2008. Biotic and abiotic particles protect marine heterotrophic bacteria during UV and ozone disinfection. Aquat. Biol. 4:147-154.

Resubmitted:

Hess-Erga, O-K., Blomvågnes-Bakke, B., Vadstein, O. Recolonisation by heterotrophic bacteria after UV irradiation or ozonation of seawater; a simulation of ballast water treatment.

In prep:

Hess-Erga, O-K., Aachmann, FL., Bruheim, P., Andersen, T., Vadstein, O. Characterization of dissolved organic matter after UV irradiation of seawater.

Hess-Erga, O-K., Enger, Ø., Vadstein, O. Microbial ecology of ballast water: disinfection, dynamics and implications.