Environmental considerations on solar disinfection of wastewater and the subsequent bacterial (re)growth

Giannakis, Stefanos; Darakas, Efthymios; Escalas-Cañellas, Antoni; Pulgarín, C.

doi:10.1039/c4pp00266k

Cited by 26 publications

(8 citation statements)

References 34 publications

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“…Over the last few decades, environmental contamination has shifted from the exclusive focus of organic and inorganic pollutants [1], towards the inclusion of bacteria and other organisms [2][3][4]. Therefore, well-organized methods are urgently required to control the spread [5] or eradicate microorganism-related issues [6]. In recent times, beside the traditional bacterial inactivation methods such as UV disinfection and chlorination, a green, efficient, and cost-effective semiconductor photocatalysis has appeared to be a more promising technique [7,8].…”

Section: Introductionmentioning

confidence: 99%

Insights into the Photocatalytic Bacterial Inactivation by Flower-Like Bi2WO6 under Solar or Visible Light, Through in Situ Monitoring and Determination of Reactive Oxygen Species (ROS)

Karbasi

Karimzadeh

Raeissi

et al. 2020

Water

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This study addresses the visible light-induced bacterial inactivation kinetics over a Bi2WO6 synthesized catalyst. The systematic investigation was undertaken with Bi2WO6 prepared by the complexation of Bi with acetic acid (carboxylate) leading to a flower-like morphology. The characterization of the as-prepared Bi2WO6 was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), specific surface area (SSA), and photoluminescence (PL). Under low intensity solar light (<48 mW/cm2), complete bacterial inactivation was achieved within two hours in the presence of the flower-like Bi2WO6, while under visible light, the synthesized catalyst performed better than commercial TiO2. The in situ interfacial charge transfer and local pH changes between Bi2WO6 and bacteria were monitored during the bacterial inactivation. Furthermore, the reactive oxygen species (ROS) were identified during Escherichia coli inactivation mediated by appropriate scavengers. The ROS tests alongside the morphological characteristics allowed the proposition of the mechanism for bacterial inactivation. Finally, recycling of the catalyst confirmed the stable nature of the catalyst presented in this study.

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Section: Introductionmentioning

confidence: 99%

Insights into the Photocatalytic Bacterial Inactivation by Flower-Like Bi2WO6 under Solar or Visible Light, Through in Situ Monitoring and Determination of Reactive Oxygen Species (ROS)

Karbasi

Karimzadeh

Raeissi

et al. 2020

Water

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“…However, in another study, the pretreatment of water using M. oleifera during SODIS showed regrowth of total coliforms after storing the treated water overnight . Complete inactivation by SODIS has been found to be directly correlated with the initial bacterial load . The complete inactivation of the bacterial load at the end of treatment and absence of bacteria after storage for 24 h mean that the water could be safely consumed after disinfection as it poses no health risk associated with potential regrowth.…”

Section: Discussionmentioning

confidence: 99%

Coupling Extracts of Plant Coagulants With Solar Disinfection Showed a Complete Inactivation of Faecal Coliforms

Megersa

Beyene²,

Ambelu³

et al. 2018

CLEAN Soil Air Water

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The small treated volume of water in polyethylene terephthalate (PET) bottles used in solar water disinfection (SODIS), and incomplete inactivation of bacteria at high water turbidity of ≥30 nephelometric turbidity units (NTU) are the major drawbacks of solar water treatment techniques. To address these problems, field experiments are conducted to inactivate faecal coliforms under natural sunlight. To assess the efficacy of large volumes, 3, 5, and 10‐L transparent plastic containers are used along with standard PET bottles (2 L) as SODIS reactors. To reduce the turbidity of the water, extracts of natural coagulants from tubers of Maerua subcordata and seeds of Moringa stenopetala are used. The results revealed that the turbidity of water and volume of containers affect the efficiency of SODIS, where the highest bacterial inactivation is observed at 10 NTU and a 0.5‐L PET bottle. However, the combined water treatment experiments of coagulation with extracts of either M. subcordata or M. stenopetala followed by SODIS on turbid water (150 NTU) showed 100% reduction of faecal coliforms with 4 h of exposure. This research demonstrates that a 10‐L container filled with water can be treated combining plant extracts with SODIS. The technology can be used for provision of safe and adequate drinking water for rural communities in developing countries.

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“…The treated samples (25 μL) for each time point were inoculated aseptically in 10 mL of MB (in sterile 15 mL Falcon tubes). To establish photodamage repair, bacterial regrowth was monitored for 7 days (or until turbidity increased) by measuring the %TA 750 daily (Mofidi & Linden ; Giannakis, Darakas, Escalas‐Canellas & Pulgarin , ). Each regrowth experiment was performed in duplicate and each %TA 750 measurement was done in triplicate.…”

Section: Methodsmentioning

confidence: 99%

Sustainable water treatment in aquaculture - photolysis and photodynamic therapy for the inactivation ofVibriospecies

et al. 2016

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Species of the genus Vibrio have been recognized as one of the most significant pathogens in aquaculture farming, causing mass mortality of farmed stocks. Photodynamic Antimicrobial Chemotherapy (PACT) with singlet oxygen ( 1 O 2 ) has been identified as a powerful and sustainable water treatment method for pathogen eradication. In this study, the efficiencies of photolytic and photodynamic disinfection protocols were studied with two Vibrio species, Vibrio parahaemolyticus and Vibrio owensii. The selected microorganisms were successfully cultivated in marine broth and irradiations were performed with~10 8 bacteria mL À1 . Treated samples were monitored for bacterial regrowth for up to 7 days. Photolysis experiments were initially conducted with UV-A, UV-B for up to 2 h and visible (VIS) light for up to 24 h. Of these, only irradiation with UV-B light for at least 45 min was efficient in controlling Vibrio. Irradiations with VIS light were subsequently repeated under PACT conditions in doseÀresponse experiments with two water-soluble porphyrins, [T 4 (MePy)P] and [TPPS 4 ]. Disinfections of samples were successful for both porphyrin types at minimum concentrations of 10 lM and 24 h of irradiation.

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Environmental considerations on solar disinfection of wastewater and the subsequent bacterial (re)growth

Cited by 26 publications

References 34 publications

Insights into the Photocatalytic Bacterial Inactivation by Flower-Like Bi2WO6 under Solar or Visible Light, Through in Situ Monitoring and Determination of Reactive Oxygen Species (ROS)

Insights into the Photocatalytic Bacterial Inactivation by Flower-Like Bi2WO6 under Solar or Visible Light, Through in Situ Monitoring and Determination of Reactive Oxygen Species (ROS)

Coupling Extracts of Plant Coagulants With Solar Disinfection Showed a Complete Inactivation of Faecal Coliforms

Sustainable water treatment in aquaculture - photolysis and photodynamic therapy for the inactivation ofVibriospecies

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