Improving UV seawater disinfection with immobilized TiO2: Study of the viability of photocatalysis (UV254/TiO2) as seawater disinfection technology

Rubio, Daniel; Casanueva, José F.; Nebot, Enrique

doi:10.1016/j.jphotochem.2013.08.002

Cited by 53 publications

(24 citation statements)

References 32 publications

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“…Results of microalgae disinfection can also be compared with fecal and marine bacteria disinfection, these being based on the evaluation of viable individuals after treatment application by incubation and colony count (Table 2). Disinfection profiles of bacteria fit with either exponential or exponential + shoulder models (Rubio et al 2013a;RomeroMartínez et al 2014;Moreno-Andrés et al 2016). Values of D 1 and D 4 (Table 2) are higher for the haptophyte T. lutea, the cyanobacterium Microcystis aeruginosa and the green alga Chlorella ellipsoidea than for bacteria, indicating a general higher resistance to ultraviolet irradiation by microalgae.…”

Section: Validation and Contextualization Of Disinfection Profilesmentioning

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: Validation and Contextualization Of Disinfection Profilesmentioning

confidence: 99%

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

et al. 2016

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“…Coupled with photocatalysts (e.g., H 2 O 2 , TiO 2 ), the UV process either oxidized or completely removed the model organic compounds (Kang et al, 2003;Al-Bastaki, 2003). Although UV disinfection of seawater is not as common as drinking water and wastewater treatment, UV/ TiO 2 had faster disinfection kinetics than only UV 254 light irradiation in a lab-scale experiment with synthetic seawater showing the effectiveness of photocatalytic treatment on seawater disinfection (Rubio et al, 2013). However, it has been shown that the presence of nitrate can lead to nitrogen incorporation into organic matter through nitrate photolysis (Kolkman et al, 2015;Thorn and Cox, 2012;Vione et al, 2001;Suzuki et al, 1987).…”

Section: Dbp Formation In Chlorinated Seawatermentioning

confidence: 99%

Disinfection by-product formation during seawater desalination: A review

2015

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Due to increased freshwater demand across the globe, seawater desalination has become the technology of choice in augmenting water supplies in many parts of the world. The use of chemical disinfection is necessary in desalination plants for pre-treatment to control both biofouling as well as the post-disinfection of desalinated water. Although chlorine is the most commonly used disinfectant in desalination plants, its reaction with organic matter produces various disinfection by-products (DBPs) (e.g., trihalomethanes [THMs], haloacetic acids [HAAs], and haloacetonitriles [HANs]), and some DBPs are regulated in many countries due to their potential risks to public health. To reduce the formation of chlorinated DBPs, alternative oxidants (disinfectants) such as chloramines, chlorine dioxide, and ozone can be considered, but they also produce other types of DBPs. In addition, due to high levels of bromide and iodide concentrations in seawater, highly cytotoxic and genotoxic DBP species (i.e., brominated and iodinated DBPs) may form in distribution systems, especially when desalinated water is blended with other source waters having higher levels of organic matter. This article reviews the knowledge accumulated in the last few decades on DBP formation during seawater desalination, and summarizes in detail, the occurrence of DBPs in various thermal and membrane plants involving different desalination processes. The review also identifies the current challenges and future research needs for controlling DBP formation in seawater desalination plants and to reduce the potential toxicity of desalinated water.

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“…Concurrently, other chlorinated active species are generated and take part in the disinfection process; in addition, residual treatment by‐products have not been observed . Recent studies have demonstrated that even in salt water, advanced oxidation processes can to a certain extent enhance the effect of a single UV reactor by the addition of a photocatalytic active surface in contact with the water under UV light exposure, with an important impact on microbiological disinfection and subsequent reactivation . This study focused on the possibility of improving disinfection of two species identified as microbiological indicators in the BWC (i.e.…”

Section: Introductionmentioning

confidence: 99%

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

Romero-Martínez

Moreno-Andrés

Acevedo-Merino

et al. 2014

J of Chemical Tech & Biotech

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BACKGROUND: Ultraviolet disinfection systems used for treating ballast water have several strict requirements such as short exposure time or high disinfection efficacy. Disinfection can be enhanced by a photocatalytic system triggered by ultraviolet light, leading to a reduction in the exposure time necessary and thus a general improvement in the treatment. The use of laboratory disinfection equipment and data modeling enabled determination of the expected treatment optimization. RESULTS: Photocatalysis enhanced ultraviolet treatment, reducing dose requirements by up to 70%, and was particularly effective on the most resistant organism. Treatment optimization was also observed in saltwater conditions. CONCLUSION: Photocatalytic treatment may speed up ballasting and deballasting processes, since a lower ultraviolet dose is required.

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Improving UV seawater disinfection with immobilized TiO2: Study of the viability of photocatalysis (UV254/TiO2) as seawater disinfection technology

Cited by 53 publications

References 32 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

Disinfection by-product formation during seawater desalination: A review

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

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Improving UV seawater disinfection with immobilized TiO2: Study of the viability of photocatalysis (UV254/TiO2) as seawater disinfection technology

Cited by 53 publications

References 32 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

Disinfection by-product formation during seawater desalination: A review

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

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Product

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