Dramatic enhancement of solar disinfection (SODIS) of wild Salmonella sp. in PET bottles by H2O2 addition on natural water of Burkina Faso containing dissolved iron

Sciacca, Frédéric; Rengifo‐Herrera, Julián A.; Wéthé, Joseph; Pulgarín, C.

doi:10.1016/j.chemosphere.2009.12.001

Cited by 81 publications

(57 citation statements)

References 34 publications

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“…Also, previous photo-disinfection treatment carried out under solar exposure in a CPC suggested that the accumulated radiation dose had a great influence on bacterial inactivation rate [11,12]. In the present work, since the natural water under treatment contains natural organic matter (NOM), dissolved and solid iron forms [7,13], it is likely that the addition of H 2 O 2 will generate under solar light a homogeneous and heterogeneous photo-Fenton system. Therefore, no others chemical will be need for the enhancement of the photo-treatment.…”

Section: Introductionmentioning

confidence: 98%

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Relevant impact of irradiance (vs. dose) and evolution of pH and mineral nitrogen compounds during natural water disinfection by photo-Fenton in a solar CPC reactor

Ndounla

Kenfack

Wéthé³

et al. 2014

Applied Catalysis B: Environmental

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a b s t r a c tThe inactivation of total coliforms/E. coli (10 4 CFU/mL) and Salmonella spp. (10 5 CFU/mL) in well water naturally containing dissolved (Fe 2+/3+ ) and solid iron forms (e.g. iron oxides) was carried out by photo Fenton treatment (Fe 2+, 3+ /H 2 O 2 /hv). In a preliminary run under simulated solar radiation, beyond 4 mg/L of added H 2 O 2 , the enteric bacteria were totally inactivated after 90 min. Thereafter, 25 L of well water were treated in the compound parabolic collector (CPC) under direct solar radiation. Three irradiation periods (i) 8 am to 2 pm (8-14 h), (ii) 10 am to 4 pm (10-16 h) and (iii) 12 pm to 6 pm (12-18 h) were evaluated for assessing the impact of different solar irradiances (W m −2 ) on the enteric bacterial inactivation rates. Both studied strains were totally inactivated under sole exposure to solar radiation in the CPC when the experiments were conducted from 8 to 14 h or 10 to 16 h. However, Salmonella spp. strains regrowth was noticed after the 24 h dark storage in all the samples previously treated with bare solar radiation. As the treated water contained Fe, the photo-Fenton disinfection at field scale in the CPC was carried out with the addition of H 2 O 2 (10 mg/L). Significant enhancement of the enteric bacteria inactivation rate was therefore recorded comparatively to the one obtained under bare solar treatment. No regrowth was observed in water treated by photo-Fenton disinfection one week after the treatment. The comparative evaluation of photo-Fenton disinfection rate as a function of different irradiation periods was based on the monitoring of the effective disinfection time (EDT), or required time to acquire the total inactivation of targeted bacteria in defined conditions. Therefore, significant impact of the irradiance on the process was noticed. High average irradiance (AI) of 35 W m −2 led to the total inactivation of Salmonella spp. in an EDT of 45 min and a dose of 26 Wh m −2 ; while low irradiance of 20 W m −2 required an EDT of 180 min for a dose 60 Wh m −2 . Thus, the experiments revealed that lower irradiance level leads to higher doses to achieve the bacterial disinfection. pH, as well as nitrite and nitrate concentration, increased during the photo-disinfection processes, while depletion was recorded for aqueous ammonia concentration.

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Section: Introductionmentioning

confidence: 98%

“…TiO 2 , [6] or H 2 O 2 and iron salts [7,8]. In order to enhance the solar disinfection process, a compound parabolic collector (CPC) solar reactor has been operated with the addition of catalyst (TiO 2 or iron salts) and/or oxidants (H 2 O 2 ) [6,9,10].…”

Section: Introductionmentioning

confidence: 99%

Relevant impact of irradiance (vs. dose) and evolution of pH and mineral nitrogen compounds during natural water disinfection by photo-Fenton in a solar CPC reactor

Ndounla

Kenfack

Wéthé³

et al. 2014

Applied Catalysis B: Environmental

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“…13,14 This form of disinfection is more than 1,000-fold slower than direct damage of UV-C. 15 Several researchers have looked for means to accelerate SODIS, using such compounds as riboflavin, TiO 2 , H 2 O 2 , and copper plus ascorbic acid. [16][17][18][19][20][21] Many of these compounds have photoactivity in the UV-A spectrum, thereby enhancing normally inefficient insults of UV-A against microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Using Limes and Synthetic Psoralens to Enhance Solar Disinfection of Water (SODIS): A Laboratory Evaluation with Norovirus, Escherichia coli, and MS2

Harding¹,

Schwab²

2012

The American Society of Tropical Medicine and Hygiene

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We investigated the use of psoralens and limes to enhance solar disinfection of water (SODIS) using an UV lamp and natural sunlight experiments. SODIS conditions were replicated using sunlight, 2 L polyethylene terephthalate (PET) bottles, and tap water with Escherichia coli, MS2 bacteriophage, and murine norovirus (MNV). Psoralens and lime acidity both interact synergistically with UV radiation to accelerate inactivation of microbes. Escherichia coli was ablated > 6.1 logs by SODIS + Lime Slurry and 5.6 logs by SODIS + Lime Juice in 30-minute solar exposures, compared with a 1.5 log reduction with SODIS alone (N = 3; P < 0.001). MS2 was inactivated > 3.9 logs by SODIS + Lime Slurry, 1.9 logs by SODIS + Lime Juice, and 1.4 logs by SODIS in 2.5-hour solar exposures (N = 3; P < 0.05). MNV was resistant to SODIS, with < 2 log reductions after 6 hours. Efficacy of SODIS against human norovirus should be investigated further.

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“…SODIS enhancement with hydrogen peroxide addition in water (10 mg/L of H 2 O 2 ) or by photo-Fenton (hv/H 2 O 2 / Fe 2+ ) process has been considered by some authors (10 mg/L of H 2 O 2 and 0.6 mg/L of added iron ) to be an affordable and efficient process which could be used to speed up the SODIS process and to increase the volume of water produced (Sciacca et al 2010;Spuhler et al 2010;Rodriguez-Chueca et al 2012). H 2 O 2 can directly attack the cellular membrane, initiating lipid peroxidation chains that increase membrane permeability and affect the viability of the cells (Halliwell and Chirico 1993;Spuhler et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The photo-Fenton process was firstly more efficiently been used under acidic conditions (pH 2.5-3) for biorecalcitrant chemical compound degradation (Herrera et al 1998;Sarria et al 2005;Kenfack et al 2009;Malato et al 2009). After the first records of the efficiency of photoFenton disinfection at near-neutral pH (Rincon and Pulgarin 2006), several authors have conducted investigations to evaluate it in natural water and some at neutral pH (Moncayo-Lasso et al 2009;Sciacca et al 2010;Ndounla et al 2013). The photochemical reduction of nitrite or nitrate and the chemical oxidation of ammonia could lead to OH • radical generation (Eqs.…”

Section: Introductionmentioning

confidence: 99%

Solar light (hv) and H2O2/hv photo-disinfection of natural alkaline water (pH 8.6) in a compound parabolic collector at different day periods in Sahelian region

Ndounla

Pulgarín

2015

Environ Sci Pollut Res

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The photo-disinfection of natural alkaline surface water (pH 8.6±0.3) for drinking purposes was carried out under solar radiation treatments. The enteric bacteria studied were the wild total coliforms/Escherichia coli (10 4 CFU/ml) and Salmonella spp. (10 4 CFU/ml) naturally present in the water. The photo-disinfection of a 25-l water sample was carried out in a solar compound parabolic collector (CPC) in the absence and in the presence of hydrogen peroxide (H 2 O 2 ). The addition of H 2 O 2 (10 mg/L) to the sample water was sufficient to enhance the photo-disinfection and ensure an irreversible lethal action on the wild enteric bacteria contents of the sample. The inactivation kinetic of the system was significantly enhanced compared to the one carried out without H 2 O 2 addition. The effect of the solar radiation parameters on the efficiency of the photo-disinfection were assessed. The pH has increased during the treatment in all the photodisinfection processes (hv and H 2 O 2 /hv). The Salmonella spp strain has shown the best effective inactivate time in alkaline water than the one recorded under acidic or near-neutral conditions. The evolution of some physico-chemical parameters of the water (turbidity, NO 2 − , NO 3 − , NH 4 + , HPO 4 2− , and bicarbonate (HCO 3 − )) was monitored during the treatment. Finally, the possible mechanistic process involved during the enteric bacteria inactivation was suggested.

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Dramatic enhancement of solar disinfection (SODIS) of wild Salmonella sp. in PET bottles by H2O2 addition on natural water of Burkina Faso containing dissolved iron

Cited by 81 publications

References 34 publications

Relevant impact of irradiance (vs. dose) and evolution of pH and mineral nitrogen compounds during natural water disinfection by photo-Fenton in a solar CPC reactor

Relevant impact of irradiance (vs. dose) and evolution of pH and mineral nitrogen compounds during natural water disinfection by photo-Fenton in a solar CPC reactor

Using Limes and Synthetic Psoralens to Enhance Solar Disinfection of Water (SODIS): A Laboratory Evaluation with Norovirus, Escherichia coli, and MS2

Solar light (hv) and H2O2/hv photo-disinfection of natural alkaline water (pH 8.6) in a compound parabolic collector at different day periods in Sahelian region

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