Re-growth of potential invasive phytoplankton following UV-based ballast water treatment

Liebich, Viola; Stehouwer, Peter Paul; Veldhuis, Marcel J.W.

doi:10.3391/ai.2012.7.1.004

Cited by 55 publications

(27 citation statements)

References 31 publications

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“…The growth curves based on phytoplankton concentration in monocultures and seawater samples show in general an initial phase characterized by growth, lag, or shrinkage trends, and then, this is followed by an increment on cell concentration (Sutherland et al 2001;Tao et al 2010;Liebich et al 2012;Bumbulis and Balog 2013;Stehouwer et al 2015). Growth of viable organisms and thus the possibility of ecosystem colonization can be assumed to occur in cases where at least one cell keeps its viability after the treatment, and then, it is exposed to favorable conditions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of ultraviolet disinfection of microalgae by growth modeling: application to ballast water treatment

et al. 2016

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Ultraviolet disinfection is a frequent option for eliminating viable organisms in ballast water to fulfill international and national regulations. The objective of this work is to evaluate the reduction of microalgae able to reproduce after UV irradiation, based on their growth features. A monoculture of microalgae Tisochrysis lutea was irradiated with different ultraviolet doses (UV-C 254 nm) by a flow-through reactor. A replicate of each treated sample was held in the dark for 5 days simulating a treatment during the ballasting; another replicate was incubated directly under the light, corresponding to the treatment application during de-ballasting. Periodic measurements of cell density were taken in order to obtain the corresponding growth curves. Irradiated samples depicted a regrowth following a logistic curve in concordance with the applied UV dose. By modeling these curves, it is possible to obtain the initial concentration of organisms able to reproduce for each applied UV dose, thus obtaining the dose-survival profiles, needed to determine the disinfection kinetics. These dose-survival profiles enable detection of a synergic effect between the ultraviolet irradiation and a subsequent dark period; in this sense, the UV dose applied during the ballasting operation and subsequent dark storage exerts a strong influence on microalgae survival. The proposed methodology, based on growth modeling, established a framework for comparing the UV disinfection by different devices and technologies on target organisms. This procedure may also assist the understanding of the evolution of treated organisms in more complex assemblages such as those that exist in natural ballast water.

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Section: Introductionmentioning

confidence: 99%

Evaluation of ultraviolet disinfection of microalgae by growth modeling: application to ballast water treatment

et al. 2016

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“…Even though UV can be very effective in destroying a large number of marine and pathogenic bacteria, microalgae and most zooplankton (Gregg et al 2009), it is not very useful for the removal of cysts (Liebich et al 2012;Minchin 2006). Furthermore, some microorganisms can survive the UV treatment due to enzyme repair systems that repair microbial DNA (Modak 2008).…”

Section: Technologies For Ballast Water Treatmentmentioning

confidence: 99%

Application of hydrodynamic cavitation in ballast water treatment

Cvetković

Kompare

Klemenčić

2015

Environ Sci Pollut Res

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Ballast water is, together with hull fouling and aquaculture, considered the most important factor of the worldwide transfer of invasive non-indigenous organisms in aquatic ecosystems and the most important factor in European Union. With the aim of preventing and halting the spread of the transfer of invasive organisms in aquatic ecosystems and also in accordance with IMO's International Convention for the Control and Management of Ships Ballast Water and Sediments, the systems for ballast water treatment, whose work includes, e.g. chemical treatment, ozonation and filtration, are used. Although hydrodynamic cavitation (HC) is used in many different areas, such as science and engineering, implied acoustics, biomedicine, botany, chemistry and hydraulics, the application of HC in ballast water treatment area remains insufficiently researched. This paper presents the first literature review that studies lab- and large-scale setups for ballast water treatment together with the type-approved systems currently available on the market that use HC as a step in their operation. This paper deals with the possible advantages and disadvantages of such systems, as well as their influence on the crew and marine environment. It also analyses perspectives on the further development and application of HC in ballast water treatment.

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“…Furthermore, tests using microalgae showed that, after a combination of UV treatment and dark storage, significant subsequent regrowth under light exposure occurred and was directly dependent on the UV dose applied [32]. Grob and Pollet [33] highlighted problems related to potential regrowth of resistant microorganisms in ballast water, and diatoms, frequently the most common and abundant phytoplankton in the seawater, have also proven to be very resistant to UV treatment [34,35].…”

Section: Using Uv Irradiationmentioning

confidence: 99%

Which Ballast Water Management System Will You Put Aboard? Remnant Anxieties: A Mini-Review

Batista

Fernandes

Lopes³

et al. 2017

Environments

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An accepted solution to the environmental problems related to a ship's ballast water has been the adoption and proper utilization of approved onboard ballast water plans and management systems (BWMS). On 8 September 2017, the International Maritime Organization Ballast Water Management Convention comes into force, and under this Convention, ships engaged in international trade must have an approved BWMS aboard to discharge ballast water, reducing species transfer. In response to enormous global concern about this problem, the overwhelming majority of the BWMS, approved currently for use by International Maritime Organization (IMO) and United States Coast Guard, utilize two main technologies (electro-chlorination or ultraviolet irradiation) as their principle mode of disinfection, often used in combination with filtration. However, both technologies have been questioned regarding their practically, efficiency, and possible environmental impacts upon discharge. This review article aims to explore some questions about these two technologies, drawing attention to some current uncertainties associated with their use. Also, it draws attention to some technical obstacles and regulatory impediments related to the new development of green biocide technology, which largely has been ignored, despite its potential as a simpler, cleaner and effective technology.

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Re-growth of potential invasive phytoplankton following UV-based ballast water treatment

Cited by 55 publications

References 31 publications

Evaluation of ultraviolet disinfection of microalgae by growth modeling: application to ballast water treatment

Evaluation of ultraviolet disinfection of microalgae by growth modeling: application to ballast water treatment

Application of hydrodynamic cavitation in ballast water treatment

Which Ballast Water Management System Will You Put Aboard? Remnant Anxieties: A Mini-Review

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