A comparison of six different ballast water treatment systems based on UV radiation, electrochlorination and chlorine dioxide

Stehouwer, Peter Paul; Buma, Anita G. J.; Peperzak, L.

doi:10.1080/09593330.2015.1021858

Cited by 68 publications

(31 citation statements)

References 40 publications

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“…3) represented similar features and shapes with respect to studies determining the vital organisms in cultures and natural seawater, using techniques such as fluorescence microscopy, flow cytometer, vital staining determinations, or chlorophyll measurements (Sahinkaya and Dilek 2009;Stehouwer et al 2010;Tao et al 2010;Stehouwer et al 2015). Absorbance measurements depicted clearly the differences in the growth of treated samples compared with controls, thus becoming suitable for quantifying the UV effects on T. lutea.…”

Section: Features Of Growth Curves and Validation Of Model Hypothesesmentioning

confidence: 94%

“…Values of survival were used to determine the disinfection profiles, and thus parameterize the effects of UV treatment on cell viability. To integrate the proposed procedure to evaluate the efficacy of UV disinfection in microalgae, growth curves of UV-treated monocultures and natural seawater in the literature (Sakai et al 2007;Tao et al 2010;Stehouwer et al 2015) were subjected to the same procedure to determine the initial concentration of viable organisms and thus their survival response. Concentration data of growth curves were retrieved from plots by the BGraph Data Extractor^software (Dr. A. J. Matheus); thus, logistic modeling was applied similarly to the experimental data.…”

Section: Data Treatmentmentioning

confidence: 99%

“…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%

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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: Features Of Growth Curves and Validation Of Model Hypothesesmentioning

confidence: 94%

Section: Data Treatmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…From the ship owner perspective, UVR systems have an advantage over EC BWTS systems because they do not use or store dangerous chemical agents. In case of emergency, ballast can be discharged at any time with no harm to the environment, but larger capacity and additional filtration are required for UVR systems (Stehouwer et al, 2015).…”

Section: Selection Of Ballast Water Treatment Systemmentioning

confidence: 99%

Shipboard Ballast Water Treatment Systems on Seagoing Ships

Vorkapić

Komar

Mrčelić

2016

ToMS

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This review paper summarizes the legislative framework and the available technologies for ballast water treatment with regard to the approval process and relevant issues. The International Maritime Organization (IMO) sets the limits of organism concentration in ballast water allowed to be discharged into the sea. The 2004 International Convention for the Control and Management of Ships Ballast Water and Sediments is the first international document that introduced obligatory ballast water management and control. Even though ballast water treatment systems are not 100 % effective, they significantly reduce the risk of spreading of invasive species through ballast water exchange. An increased manufacturer interest in the system’s approval or development of new technologies is not expected in future because the procedure is time-consuming and expensive. The final choice of optimal ballast water treatment system depends on the ship owner or operator taking into account the price, type of the ship, whether it is a newbuilding or an existing ship, ballast system capacity and the seas where ships ply as well as harbours at which they call.

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“…The main on board and port-based treatment technologies used today are ultraviolet (UV) sterilization [8] and chlorine electrolysis [9]. Fig.…”

Section: Introductionmentioning

confidence: 99%

CMOS based image cytometry for detection of phytoplankton in ballast water

Pérez

Jofre

Martínez

et al. 2017

Biomed. Opt. Express

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Abstract:We introduce an image cytometer (I-CYT) for the analysis of phytoplankton in fresh and marine water environments. A linear quantification of cell numbers was observed covering several orders of magnitude using cultures of Tetraselmis and Nannochloropsis measured by autofluorescence in a laboratory environment. We assessed the functionality of the system outside the laboratory by phytoplankton quantification of samples taken from a marine water environment (Dutch Wadden Sea, The Netherlands) and a fresh water environment (Lake Ijssel, The Netherlands). The I-CYT was also employed to study the effects of two ballast water treatment systems (BWTS), based on chlorine electrolysis and UV sterilization, with the analysis including the vitality of the phytoplankton. For comparative study and benchmarking of the I-CYT, a standard flow cytometer was used. Our results prove a limit of detection (LOD) of 10 cells/ml with an accuracy between 0.7 and 0.5 log, and a correlation of 88.29% in quantification and 96.21% in vitality, with respect to the flow cytometry results.

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A comparison of six different ballast water treatment systems based on UV radiation, electrochlorination and chlorine dioxide

Cited by 68 publications

References 40 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

Shipboard Ballast Water Treatment Systems on Seagoing Ships

CMOS based image cytometry for detection of phytoplankton in ballast water

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