The regrowth of phytoplankton cultures after UV disinfection

Martínez, Lucía Fernández; Mahamud, Manuel María; Lavín, Antonio Gutiérrez; Bueno, Julio L.

doi:10.1016/j.marpolbul.2012.11.019

Cited by 34 publications

(7 citation statements)

References 33 publications

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“…According to the BWMC-Guideline 8, the evaluation of the treatment efficacy is based on the determination of living organisms by widely accepted standard methods (Gollasch et al 2012;Cullen and MacIntyre 2016), such as vital fluorescence stains detected using flow cytometry or fluorescence microscopy, ATP content, photosynthetic activity, or motility assessment (Hessen et al 1997;Sato et al 2004;Gavand et al 2007;Gallo-Villanueva et al 2011;Steinberg et al 2011Steinberg et al , 2012Fan et al 2013;Martínez et al 2013;Stehouwer et al 2013;Adams et al 2014;First and Drake 2014;Tilney et al 2014;Feng et al 2015;Gollasch et al 2015;Olsen et al 2015;van Slooten et al 2015;Wright et al 2015). However, the application of UV treatment does not cause immediate changes in the concentration of living organisms, although their growth curves become different over the time, depending on the applied UV dose (Tao et al 2010;Gorokhova et al 2012;Martínez et al 2012).…”

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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“…UV radiation is a clean technology that exhibits high efficiency for bacteria inactivation. However, ballast water treatment by UV radiation or photocatalysis alone during ballasting maybe requested to be secondary treated during deballasting, owing to the reactivation and multiplication of microorganisms in ballast tank (Martinez et al 2013). The results in Figure 3 implied that application of UV/Ag-TiO 2 and ozonation simultaneously could overcome the drawbacks of sole UV radiation.…”

Section: Toxicity Of Effluentmentioning

confidence: 99%

Ballast water treatment by sequential filtration and advanced oxidation process

Wu¹,

Lu²,

Zhang³

2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

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The ability of a 2-stage (filtration + UV/Ag-TiO 2 /O 3) ballast water treatment process to control non-indigenous species introduction has been assessed. The removal efficiencies of turbidity and phytoplankton were monitored during the filtration pretreatment phase, and the degradation of phytoplankton (Dunaliella salina and Phacodactylum tricornutum) chlorophyll a (chl-a) by UV/Ag-TiO 2 /O 3 were investigated. Results showed that 50 μm screen filtration could remove a small part of phytoplankton, and reduce the turbidity. Compared to individual unit processes with ozone or UV/Ag-TiO 2 , the removal of chl-a by the combined UV/Ag-TiO 2 /O 3 process was enhanced, and the effluent exhibited a persistence toxicity within 24 h. The results indicate that a combination of filtration and UV/Ag-TiO 2 /O 3 advanced oxidation maybe a promising method for ballast water treatment.

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“…Recently, combined UV and nano-TiO 2 photocatalysis technology has caught much sight to inhibit the photoreactivation and dark repair of bacteria (Shang et al 2009 ). Under UV irradiation, nano-TiO 2 catalyst can generate a large number of reactive oxygenated species, which are highly effective to deconstruct cellular structure, accelerate the death of microorganisms, and prevent the regeneration of harmful microorganisms in the ballast water (Martínez et al 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Inactivation effect and mechanisms of combined ultraviolet and metal-doped nano-TiO2 on treating Escherichia coli and Enterococci in ballast water

Wang

Huang

Zhang

et al. 2020

Environ Sci Pollut Res

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The discharge of ship ballast water (containing large amounts of alien organisms) has caused severe ecological hazards to marine environments. In this study, three metal elements (Ag, Fe, and Gd) were doped to nano-TiO 2 material respectively (content: 0.4%, 0.7%, and 1.0%) to improve inactivation effect of Escherichia coli and Enterococci in ballast water. Experimental results indicate that compared with the sole ultraviolet (UV) and the UV and original nano-TiO 2 , the UV and metal-doped nano-TiO 2 increased the bacterial inactivation rate to different extents. For each metal element, high external metal content (1.0%) corresponded to high inactivation effort. The doping of Ag resulted in optimal inactivation effort, and the addition of Fe and Gd caused unobvious effort. At the end of the inactivation process (20 s), the UV and 1% Ag-doped nano-TiO 2 reached the highest logarithmic sterilization rates (0.915 for Escherichia coli and 0.805 for Enterococcus ). The doping of Ag, Fe, and Gd did not change the anatase phase TiO 2 crystal form, and 1% Ag-doped nano-TiO 2 had the smallest particle diameter and the evenest distribution of nanoparticles. Compared with the sole UV, the UV and Ag-doped nano-TiO 2 treatment resulted in higher malondialdehyde contents (0.0646 μmol/L for Escherichia coli and 0.0529 μmol/L for Enterococci ) and lower superoxide dismutase activities (0.672 U/mL for Escherichia coli and 0.792 U/mL for Enterococci ), which were in accordance with high inactivation rates in these cases.

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The regrowth of phytoplankton cultures after UV disinfection

Cited by 34 publications

References 33 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

Ballast water treatment by sequential filtration and advanced oxidation process

Inactivation effect and mechanisms of combined ultraviolet and metal-doped nano-TiO2 on treating Escherichia coli and Enterococci in ballast water

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