Improvement of ballast water disinfection using a photocatalytic (<scp>UV</scp>‐C + <scp>TiO<sub>2</sub></scp>) flow‐through reactor for saltwater treatment

Romero-Martínez, Leonardo; Moreno-Andrés, Javier; Acevedo-Merino, Asunción; Nebot, Enrique

doi:10.1002/jctb.4385

Cited by 29 publications

(20 citation statements)

References 53 publications

(66 reference statements)

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“…S1 in Supporting Information), with k = 0.69 ± 0.04 cm 2 mJ −1 , SL = 2.72 ± 1.05 mJ cm −2 , RMSE = 0.411, and R 2 = 0.975 . Therefore, D 1 was 5.87 mJ cm −2 and D 4 was 16.06 mJ cm −2 , which are in accordance with previous data obtained using the same type of UV device and organism

N = N_{0} \frac{{normale}^{- k D} \cdot {normale}^{k SL}}{1 + {normale}^{- k D} \cdot ({normale}^{k SL} - 1)}

…”

Section: Resultssupporting

confidence: 89%

“…Other authors dismiss the effect of suspended solids in the tailing appearance; additionally, the tailing is observed in organisms subjected to chemical disinfection thus discarding the causes related with the shading against the UV irradiation . Previous studies using a collimated beam reactor and the pure strain of Escherichia coli ATCC 1229 as the indicator organism showed the existence of tailing once inactivated for approximately four log units of the initial concentration . Since the organism and water matrices were similar in these studies, it can be assumed that the appearance of tailing depends on the way that the UV dose is applied.…”

Section: Resultsmentioning

confidence: 99%

“…The UV treatment was applied using a tubular reactor containing a low‐pressure mercury lamp surrounded by a quartz sleeve with a total power of 10 W. The power at 254 nm was determined using actinometry with ferric oxalate reporting a power of 2.6 W . The flow through the reactor was previously characterized with salt tracer, indicating a quasi plug‐flow for the flow rate used in the experiments . The UV dose applied in one single pass through the reactor was calculated according to the USEPA specifications for plug‐flow systems (Eqn.…”

Section: Methodsmentioning

confidence: 99%

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Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Romero-Martínez

Duque-Sarango

Acevedo-Merino

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Industrial and commercial activities may require seawater disinfection for which ultraviolet (UV) irradiation is a widely used technology. Ultraviolet devices are commonly used in laboratory to evaluate the disinfection efficacy, looking for the highest control of the experimental conditions such as collimated beam reactor or continuous flow reactors with recirculation. However, commercial applications usually require the application of the UV treatment by means of one single pass through the reactor. The objective in this article is to evaluate and compare the efficacy achieved by two different continuous flow systems, i.e. single‐pass and recirculation devices, on bacteria in buffered distilled and seawater matrices. RESULTS Survival data obtained with a single‐pass device followed by disinfection kinetics according to the log‐linear + shoulder model, requiring a dose of 5.87 mJ cm−2 to inactivate one log unit of the initial concentration of the pure strain Escherichia coli ATCC 11229. The survival achieved with a recirculation reactor followed by a biphasic model, required 12.86 mJ cm−2 to inactivate one log unit of the initial concentration and showed loss of efficacy at higher doses. There was substantial loss of the inactivating efficacy in the treatment of bacteria in seawater using the recirculation device. Natural populations of Escherichia coli and Enterococcus sp. were more sensitive to the UV treatment. CONCLUSION According to the obtained data and their comparison with previous experiments in the literature, the single‐pass prototype is a better approach for determining the inactivating efficacy of UV systems, in comparison with collimated beam and recirculation devices. © 2019 Society of Chemical Industry

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N = N_{0} \frac{{normale}^{- k D} \cdot {normale}^{k SL}}{1 + {normale}^{- k D} \cdot ({normale}^{k SL} - 1)}

…”

Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Romero-Martínez

Duque-Sarango

Acevedo-Merino

et al. 2019

J of Chemical Tech & Biotech

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“…The area integral term was calculated numerically using an MS Excel spreadsheet. Previous experiments using the same UV device with salt tracer indicated the system works similarly to plug-flow using flow rates over 162 L h −1 , and the dose calculation and inactivating effects were assessed in bacteria and matched with a collimated beam reactor by biodosimetry (USEPA 2006;Romero-Martínez et al 2014;Moreno-Andrés et al 2016).…”

Section: Methodsmentioning

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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“…Nanofiltration and ultraviolet (UV) TiO 2 photocatalysis are able to remove several organic micropollutants and microorganisms from water. However, there are some challenges related to their application.…”

Section: Introductionmentioning

confidence: 99%

Development of photocatalytic titanium dioxide membranes for degradation of recalcitrant compounds

Sanches

Nunes

Passarinho

et al. 2017

J. Chem. Technol. Biotechnol

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BACKGROUND Immobilization of TiO2 photoactive nanoparticles on a nanofiltration membrane without loss of permselectivity properties is currently a challenge. In this study, immobilization of TiO2 nanoparticles on a ceramic commercial membrane surface by direct current reactive magnetron sputtering was addressed. The best membrane was compared with an unmodified membrane and a membrane modified by a generic chemical–physical method in terms of membrane permselectivity and photocatalytic properties. RESULTS Magnetron sputtering was able to achieve similar photocatalytic activity to the chemical–physical method, where Evonik P25 TiO2 nanoparticles were used, while maintaining membrane rejection and permeability. The layer formed by magnetron sputtering exhibits uniformly distributed nanostructured columns, aligned perpendicularly to the membrane surface. Furthermore, the membrane hydrophilicity increase achieved is promising for fouling control. A shorter sputtering time and distance between the titanium target and the membrane were preferable to effectively degrade the pesticides diuron and chlorfenvinphos. Under optimum sputtering conditions, 95% and 78% increases were attained for the degradation of diuron and chlorfenvinphos, respectively, compared with the unmodified membrane. CONCLUSION The photocatalytic membranes developed are potential candidates for the simultaneous retention and photocatalytic degradation of recalcitrant micropollutants. However, if the purpose is to retain low molecular weight molecules, retentive properties should be improved. © 2016 Society of Chemical Industry

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Improvement of ballast water disinfection using a photocatalytic (UV‐C + TiO₂) flow‐through reactor for saltwater treatment

Cited by 29 publications

References 53 publications

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

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

Development of photocatalytic titanium dioxide membranes for degradation of recalcitrant compounds

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Improvement of ballast water disinfection using a photocatalytic (UV‐C + TiO2) flow‐through reactor for saltwater treatment

Cited by 29 publications

References 53 publications

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

Comparing the inactivating efficacy of enteric bacteria in seawater treated with different configurations of continuous flow‐through ultraviolet devices: single‐pass and recirculation

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

Development of photocatalytic titanium dioxide membranes for degradation of recalcitrant compounds

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Improvement of ballast water disinfection using a photocatalytic (UV‐C + TiO₂) flow‐through reactor for saltwater treatment